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0001 
0002 C======================================================================C
0003 C                                                                      C
0004 C      QQQ         GGG       SSSS     JJJJJJJ    EEEEEEE    TTTTTTT    C
0005 C     Q   Q       G   G     S    S          J    E             T       C
0006 C    Q     Q     G          S               J    E             T       C
0007 C    Q     Q     G   GGG     SSSS           J    EEEEE         T       C
0008 C    Q   Q Q     G     G         S          J    E             T       C
0009 C     Q   Q       G   G     S    S     J   J     E             T       C
0010 C      QQQ QQ      GGG       SSSS       JJJ      EEEEEEE       T       C
0011 C                                                                      C
0012 C                                                                      C
0013 C----------------------------------------------------------------------C
0014 C                                                                      C
0015 C                    QUARK - GLUON - STRING - MODEL                    C
0016 C                                                                      C
0017 C                HIGH ENERGY HADRON INTERACTION PROGRAM                C
0018 C                                                                      C
0019 C                                  BY                                  C
0020 C                                                                      C
0021 C                 N. N. KALMYKOV AND S. S. OSTAPCHENKO                 C
0022 C                                                                      C
0023 C               MOSCOW STATE UNIVERSITY,  MOSCOW, RUSSIA               C
0024 C                      e-mail: serg@eas.npi.msu.su                     C
0025 C----------------------------------------------------------------------C
0026 C                 SUBROUTINE VERSION TO BE LINKED WITH                 C
0027 C                       C O N E X  or N E X U S                        C
0028 C                                  BY                                  C
0029 C                               T. PIEROG                              C
0030 C                                 FROM                                 C
0031 C                 SUBROUTINE VERSION TO BE LINKED WITH                 C
0032 C                             C O R S I K A                            C
0033 C               KARLSRUHE  AIR SHOWER SIMULATION PROGRAM               C
0034 C                          WITH MODIFICATIONS                          C
0035 C                                  BY                                  C
0036 C                      D. HECK  IK3 FZK KARLSRUHE                      C
0037 C----------------------------------------------------------------------C
0038 C                 last modification:  Sep. 27, 2003                    C
0039 C               Version qgsjet03cx.f from qgsjet03.f                   C
0040 C----------------------------------------------------------------------C
0041 C  modifications for Corsika are marked by cdh and for Conex by ctp    C
0042 c  (common subroutine name with nexus : add QGS in front of the name   C
0043 C=======================================================================
0044 
0045 ctp      SUBROUTINE PSAINI
0046       SUBROUTINE QGSPSAINI
0047 c Common initialization procedure
0048 c-----------------------------------------------------------------------
0049       IMPLICIT DOUBLE PRECISION (A-H,O-Z)
0050       INTEGER DEBUG
0051       CHARACTER *7 TY
0052       LOGICAL LCALC!,LSECT
0053 ********************************************
0054       DIMENSION EQ(17),MIJ(17,17,4),NIJ(17,17,4),CSJET(17,17,68),
0055      *CS1(17,17,68),GZ0(2),GZ1(3)
0056       COMMON /Q_XSECT/  GSECT(10,5,4)
0057       COMMON /Q_AREA1/  IA(2),ICZ,ICP
0058       COMMON /Q_AREA5/  RD(2),CR1(2),CR2(2),CR3(2)
0059 ********************************************
0060       COMMON /Q_AREA6/  PI,BM,AM
0061       COMMON /Q_AREA7/  RP1
0062       COMMON /Q_AREA10/ STMASS,AM0,AMN,AMK,AMC,AMLAMC,AMLAM,AMETA
0063       COMMON /Q_AREA15/ FP(5),RQ(5),CD(5)
0064       COMMON /Q_AREA16/ CC(5)
0065       COMMON /Q_AREA17/ DEL,RS,RS0,FS,ALFP,RR,SH,DELH
0066       COMMON /Q_AREA18/ ALM,QT0,QLOG,QLL,AQT0,QTF,BET,AMJ0
0067       COMMON /Q_AREA19/ AHL(5)
0068 ********************************************
0069       COMMON /Q_AREA22/ SJV0,FJS0(5,3)
0070 ********************************************
0071       COMMON /Q_AREA23/ RJV(50)
0072       COMMON /Q_AREA24/ RJS(50,5,10)
0073       COMMON /Q_AREA27/ FP0(5)
0074       COMMON /Q_AREA28/ ARR(4)
0075       COMMON /Q_AREA29/ CSTOT(17,17,68)
0076       COMMON /Q_AREA30/ CS0(17,17,68)
0077       COMMON /Q_AREA31/ CSBORN(17,68)
0078       COMMON /Q_AREA32/ CSQ(17,2,2),CSBQ(17,2,2)
0079       COMMON /Q_AREA33/ FSUD(10,2)
0080       COMMON /Q_AREA34/ QRT(10,101,2)
0081       COMMON /Q_AREA35/ SJV(10,5),FJS(10,5,15)
0082       COMMON /Q_AREA39/ JCALC
0083       COMMON /Q_AREA40/ JDIFR
0084       COMMON /Q_AREA41/ TY(5)
0085       COMMON /Q_AREA43/ MONIOU
0086       COMMON /Q_DEBUG/  DEBUG
0087 ********************************************
0088       COMMON /Q_AREA44/ GZ(10,5,4),GZP(10,5,4)
0089 c Auxiliary common blocks to calculate hadron-nucleus cross-sections
0090       COMMON /Q_AR1/    ANORM
0091       COMMON /Q_AR2/    RRR,RRRM
0092 ********************************************
0093 cdh 8/10/98
0094       COMMON /Q_AREA48/ QGSASECT(10,6,4)
0095 cdh 8/12/98
0096       COMMON /Q_VERSION/VERSION
0097       SAVE
0098 ********************************************
0099 ctp 11/03/03
0100       character*500 fndat,fnncs
0101       common/qgsfname/  fndat, fnncs, ifdat, ifncs
0102       common/qgsnfname/ nfndat, nfnncs
0103 c-------------------------------------------------
0104         WRITE(MONIOU,100)
0105  100    FORMAT(' ',
0106      *           '====================================================',
0107      *     /,' ','|                                                  |',
0108      *     /,' ','|           QUARK GLUON STRING JET MODEL           |',
0109      *     /,' ','|                                                  |',
0110      *     /,' ','|         HADRONIC INTERACTION MONTE CARLO         |',
0111      *     /,' ','|                        BY                        |',
0112      *     /,' ','|        N.N. KALMYKOV AND S.S. OSTAPCHENKO        |',
0113      *     /,' ','|                                                  |',
0114      *     /,' ','|            e-mail: serg@eas.npi.msu.su           |',
0115      *     /,' ','|                                                  |',
0116      *     /,' ','| Publication to be cited when using this program: |',
0117      *     /,' ','| N.N. Kalmykov & S.S. Ostapchenko, A.I. Pavlov    |',
0118      *     /,' ','| Nucl. Phys. B (Proc. Suppl.) 52B (1997) 17       |',
0119      *     /,' ','|                                                  |',
0120      *     /,' ','====================================================',
0121      *     /)
0122         IF(DEBUG.GE.1)WRITE (MONIOU,210)
0123 210     FORMAT(2X,'QGSPSAINI - MAIN INITIALIZATION PROCEDURE')
0124 cdh
0125         VERSION = 2003.
0126 
0127 c AHL(i) - parameter for the energy sharing procedure (govern leading hadronic state
0128 c inelasticity for primary pion, nucleon, kaon, D-meson, Lambda_C correspondingly)
0129       AHL(1)=1.D0-2.D0*ARR(1)
0130       AHL(2)=1.D0-ARR(1)-ARR(2)
0131       AHL(3)=1.D0-ARR(1)-ARR(3)
0132       AHL(4)=1.D0-ARR(1)-ARR(4)
0133       AHL(5)=AHL(2)+ARR(1)-ARR(4)
0134 
0135 c-------------------------------------------------
0136 c 1/CC(i) = C_i - shower enhancement coefficients for one vertex
0137 c (C_ab=C_a*C_b) (i - ICZ)
0138       CC(2)=1.D0/DSQRT(CD(2))
0139       CC(1)=1.D0/CC(2)/CD(1)
0140       CC(3)=1.D0/CC(2)/CD(3)
0141       CC(4)=1.D0/CC(2)/CD(4)
0142       CC(5)=1.D0/CC(2)/CD(5)
0143 
0144 c FP0(i) - vertex constant (FP_ij=FP0_i*FP0_j) for pomeron-hadron interaction (i - ICZ)
0145       FP0(2)=DSQRT(FP(2))
0146       FP0(1)=FP(1)/FP0(2)
0147       FP0(3)=FP(3)/FP0(2)
0148       FP0(4)=FP(4)/FP0(2)
0149       FP0(5)=FP(5)/FP0(2)
0150 
0151 c SH - hard interaction effective squared (SH=pi*R_h^2, R_h^2=4/Q0^2)
0152       SH=4.D0/QT0*PI
0153 c Auxiliary constants for the hard interaction
0154       AQT0=DLOG(4.D0*QT0)
0155       QLOG=DLOG(QT0/ALM)
0156       QLL=DLOG(QLOG)
0157 
0158 ********************************************
0159       IF(IFDAT.NE.1)THEN
0160         INQUIRE(FILE='QGSDAT01',EXIST=LCALC)
0161       ELSE                                                  !ctp
0162         INQUIRE(FILE=FNDAT(1:NFNDAT),EXIST=LCALC)
0163       ENDIF
0164       IF(LCALC)then
0165         IF(DEBUG.GE.1)WRITE (MONIOU,211)
0166 211     FORMAT(2X,'PSAINI: HARD CROSS SECTION RATIOS READOUT FROM THE'
0167      *    ,' FILE QGSDAT01')
0168         IF(IFDAT.NE.1)THEN
0169           OPEN(1,FILE='QGSDAT01',STATUS='OLD')
0170         ELSE                                                  !ctp
0171           OPEN(IFDAT,FILE=FNDAT(1:NFNDAT),STATUS='OLD')
0172         ENDIF
0173         READ (1,*)CSBORN,CS0,CSTOT,CSQ,CSBQ,
0174      *  FSUD,QRT,SJV,FJS,RJV,RJS,GZ,GZP,GSECT
0175         CLOSE(1)
0176       ELSE
0177 ********************************************
0178 
0179 ctp        IF(DEBUG.GE.1)WRITE (MONIOU,201)
0180         WRITE (MONIOU,201)
0181 201     FORMAT(2X,'QGSPSAINI: HARD CROSS SECTIONS CALCULATION')
0182 c--------------------------------------------------
0183 c Hard pomeron inclusive cross sections calculation
0184 c--------------------------------------------------
0185 c EQ(I) - energy squared tabulation (Q0^2, 4*Q0^2, ...)
0186       DO 1 I=1,17
0187 1     EQ(I)=QT0*4.D0**FLOAT(I-1)
0188 
0189       DO 2 I=1,17
0190 c QI - effective momentum (Qt**2/(1-z)**2) cutoff for the Born process
0191       QI=EQ(I)
0192 c M, L define parton types (1-g, 2-q)
0193       DO 2 M=1,2
0194       DO 2 L=1,2
0195 c K defines c.m. energy squared for the process (for current energy tabulation)
0196       DO 2 K=1,17
0197       K1=K+17*(M-1)+34*(L-1)
0198       IF(K.LE.I.OR.K.EQ.2)THEN
0199         CSBORN(I,K1)=0.D0
0200       ELSE
0201 c SK - c.m. energy squared for the hard interaction
0202         SK=EQ(K)
0203 c CSBORN(I,K1) - Born cross-section (2->2 process) - procedure QGSPSBORN
0204         CSBORN(I,K1)=QGSPSBORN(QI,SK,M-1,L-1)
0205       ENDIF
0206 2     CONTINUE
0207 
0208 c Cross-sections initialization
0209       DO 3 I=1,17
0210       DO 3 J=1,17
0211       N=MAX(I,J)
0212       DO 3 M=1,2
0213       DO 3 L=1,2
0214       ML=M+2*L-2
0215       DO 3 K=1,17
0216       K1=K+17*(M-1)+34*(L-1)
0217       CSJET(I,J,K1)=0.D0
0218       IF(K.LE.N.OR.K.EQ.2)THEN
0219         CSTOT(I,J,K1)=-80.D0
0220         CS0(I,J,K1)=-80.D0
0221         MIJ(I,J,ML)=K+1
0222         NIJ(I,J,ML)=K+1
0223       ELSE
0224         CSTOT(I,J,K1)=DLOG(CSBORN(N,K1))
0225         CS0(I,J,K1)=CSTOT(I,J,K1)
0226       ENDIF
0227 3     CONTINUE
0228 
0229 c N-maximal number of ladder runs taken into account
0230       N=2
0231 4     CONTINUE
0232         IF(DEBUG.GE.2)WRITE (MONIOU,202)N,EQ(MIJ(1,1,1)),EQ(NIJ(1,1,1))
0233 202     FORMAT(2X,'PSAINI: NUMBER OF LADDER RUNS TO BE CONSIDERED:',I2/
0234      *  4X,'MINIMAL MASSES SQUARED FOR THE UNORDERED AND STRICTLY',
0235      *  ' ORDERED LADDERS:'/4X,E10.3,3X,E10.3)
0236       DO 6 I=1,17
0237 c QI - effective momentum cutoff for upper end of the ladder
0238       QI=EQ(I)
0239       DO 6 J=1,17
0240 c QJ - effective momentum cutoff for lower end of the ladder
0241       QJ=EQ(J)
0242 c QQ - maximal effective momentum cutoff
0243       QQ=MAX(QI,QJ)
0244 c S2MIN - minimal energy squared for 2->2 subprocess
0245       S2MIN=MAX(QQ,4.D0*QT0)
0246       SM=DSQRT(QT0/S2MIN)
0247 c SMIN - minimal energy squared for 2->3 subprocess
0248       SMIN=S2MIN*(1.D0+SM)/(1.D0-SM)
0249 
0250 c M, L define parton types (1-g, 2-q)
0251       DO 6 M=1,2
0252       DO 6 L=1,2
0253       ML=M+2*L-2
0254 c KMIN corresponds to minimal energy at which more runs are to be considered -
0255 c stored in array NIJ(I,J,ML) - for strictly ordered ladder
0256       KMIN=NIJ(I,J,ML)
0257       IF(KMIN.LE.17)THEN
0258         DO 5 K=KMIN,17
0259         SK=EQ(K)
0260         IF(SK.LE.SMIN)THEN
0261           NIJ(I,J,ML)=NIJ(I,J,ML)+1
0262         ELSE
0263           K1=K+17*(M-1)+34*(L-1)
0264 c CS1(I,J,K1) - cross-section for strictly ordered ladder (highest virtuality run
0265 c is the lowest one) - procedure QGSPSJET1
0266           CS1(I,J,K1)=QGSPSJET1(QI,QJ,SK,S2MIN,M-1,L)
0267         ENDIF
0268 5       CONTINUE
0269       ENDIF
0270 6     CONTINUE
0271 
0272       DO 8 I=1,17
0273       DO 8 J=1,17
0274       DO 8 M=1,2
0275       DO 8 L=1,2
0276       ML=M+2*L-2
0277       KMIN=NIJ(I,J,ML)
0278       IF(KMIN.LE.17)THEN
0279         DO 7 K=KMIN,17
0280         K1=K+17*(M-1)+34*(L-1)
0281 c CSJ - cross-section for strictly ordered ladder (highest virtuality run is the
0282 c lowest one) - Born contribution is added
0283         CSJ=CS1(I,J,K1)+CSBORN(MAX(I,J),K1)
0284         IF(DEBUG.GE.2)WRITE (MONIOU,204)CSJ,EXP(CS0(I,J,K1))
0285 204     FORMAT(2X,'PSAINI: NEW AND OLD VALUES OF THE CONTRIBUTION',
0286      *  ' OF THE STRICTLY ORDERED LADDER:'/4X,E10.3,3X,E10.3)
0287         IF(CSJ.EQ.0.D0.OR.ABS(1.D0-EXP(CS0(I,J,K1))/CSJ).LT.1.D-2)THEN
0288                NIJ(I,J,ML)=NIJ(I,J,ML)+1
0289         ELSE
0290 c CS0(I,J,K1) - cross-section logarithm for strictly ordered ladder
0291           CS0(I,J,K1)=DLOG(CSJ)
0292         ENDIF
0293 7       CONTINUE
0294       ENDIF
0295 8     CONTINUE
0296 
0297       DO 10 I=1,17
0298       QI=EQ(I)
0299       DO 10 J=1,17
0300       QJ=EQ(J)
0301       QQ=MAX(QI,QJ)
0302       S2MIN=MAX(QQ,4.D0*QT0)
0303       SM=DSQRT(QT0/S2MIN)
0304 c SMIN - minimal energy squared for 2->3 subprocess
0305       SMIN=S2MIN*(1.D0+SM)/(1.D0-SM)
0306 
0307       DO 10 M=1,2
0308       DO 10 L=1,2
0309       ML=M+2*L-2
0310 c KMIN corresponds to minimal energy at which more runs are to be considered
0311 c stored in array MIJ(I,J,ML) - for any ordering in the ladder
0312       KMIN=MIJ(I,J,ML)
0313       IF(KMIN.LE.17)THEN
0314         DO 9 K=KMIN,17
0315         SK=EQ(K)
0316         IF(SK.LE.SMIN)THEN
0317           MIJ(I,J,ML)=MIJ(I,J,ML)+1
0318         ELSE
0319           K1=K+17*(M-1)+34*(L-1)
0320 c CS1(I,J,K1) - cross-section for any ordering in the ladder (highest virtuality
0321 c run is somewhere in the middle; runs above and below it are strictly ordered
0322 c towards highest effective momentum run) - procedure QGSPSJET
0323           CS1(I,J,K1)=QGSPSJET(QI,QJ,SK,S2MIN,M-1,L)
0324         ENDIF
0325 9       CONTINUE
0326       ENDIF
0327 10    CONTINUE
0328 
0329       DO 12 I=1,17
0330       DO 12 J=1,17
0331       DO 12 M=1,2
0332       DO 12 L=1,2
0333       ML=M+2*L-2
0334 c KMIN corresponds to minimal energy at which more runs are to be considered
0335       KMIN=MIJ(I,J,ML)
0336       IF(KMIN.LE.17)THEN
0337         DO 11 K=KMIN,17
0338         K1=K+17*(M-1)+34*(L-1)
0339         K2=K+17*(L-1)+34*(M-1)
0340         CSJ=CS1(I,J,K1)+EXP(CS0(J,I,K2))
0341         IF(CSJ.EQ.0.D0.OR.ABS(1.D0-EXP(CSTOT(I,J,K1))/CSJ).LT.1.D-2)
0342      *  MIJ(I,J,ML)=MIJ(I,J,ML)+1
0343         IF(DEBUG.GE.2)WRITE (MONIOU,203)CSJ,EXP(CSTOT(I,J,K1))
0344 203     FORMAT(2X,'PSAINI: NEW AND OLD VALUES OF THE UNORDERED LADDER',
0345      *  ' CROSS SECTION:'/4X,E10.3,3X,E10.3)
0346 11      CSTOT(I,J,K1)=DLOG(CSJ)
0347       ENDIF
0348 12    CONTINUE
0349 
0350 c One more run
0351       N=N+1
0352       DO 13 L=1,4
0353 13    IF(MIJ(1,1,L).LE.17.OR.NIJ(1,1,L).LE.17)GOTO 4
0354 
0355 c Logarithms of the Born cross-section are calculated - to be interpolated in the
0356 c QGSPSBINT procedure
0357       DO 14 I=1,17
0358       DO 14 K=1,17
0359       DO 14 M=1,2
0360       DO 14 L=1,2
0361       K1=K+17*(M-1)+34*(L-1)
0362       IF(K.LE.I.OR.K.EQ.2)THEN
0363         CSBORN(I,K1)=-80.D0
0364       ELSE
0365         CSBORN(I,K1)=DLOG(CSBORN(I,K1))
0366       ENDIF
0367 14    CONTINUE
0368 
0369 c Total and Born hard cross-sections logarithms for minimal cutoff (QT0) - to be
0370 c interpolated in the PSJINT0 procedure
0371       DO 15 M=1,2
0372       DO 15 L=1,2
0373       DO 15 K=1,17
0374       IF(K.LE.2)THEN
0375         CSQ(K,M,L)=-80.D0
0376         CSBQ(K,M,L)=-80.D0
0377       ELSE
0378         K1=K+17*(M-1)+34*(L-1)
0379         CSBQ(K,M,L)=CSBORN(1,K1)
0380         CSQ(K,M,L)=CSTOT(1,1,K1)
0381       ENDIF
0382 15    CONTINUE
0383 
0384 c-------------------------------------------------
0385 c FSUD(K,M)=-ln(SUD) - timelike Sudakov formfactor logarithm - procedure
0386 c PSUDT(QMAX,M-1), M=1 - g, M=2 - q
0387       DO 17 M=1,2
0388       FSUD(1,M)=0.D0
0389       DO 17 K=2,10
0390 c QMAX is the maximal effective momentum ( Qt**2/z**2/(1-z)**2 in case of the timelike
0391 c evolution )
0392       QMAX=QTF*4.D0**(1.D0+K)
0393 17    FSUD(K,M)=PSUDT(QMAX,M-1)
0394 
0395 c QRT(K,L,M) - effective momentum logarithm for timelike branching ( ln QQ/16/QTF )
0396 c for given QMAX (defined by K, QLMAX = ln QMAX/16/QTF ) and a number
0397 c of random number values (defined by L) - to be interpolated by the PSQINT
0398 c procedure; M=1 - g, M=2 - q
0399       DO 18 M=1,2
0400       DO 18 K=1,10
0401       QLMAX=1.38629D0*(K-1)
0402       QRT(K,1,M)=0.D0
0403       QRT(K,101,M)=QLMAX
0404       DO 18 I=1,99
0405       IF(K.EQ.1)THEN
0406         QRT(K,I+1,M)=0.D0
0407       ELSE
0408         QRT(K,I+1,M)=PSROOT(QLMAX,.01D0*I,M)
0409       ENDIF
0410 18    CONTINUE
0411 c-------------------------------------------------
0412 
0413         IF(DEBUG.GE.2)WRITE (MONIOU,205)
0414 205    FORMAT(2X,'QGSPSAINI: PRETABULATION OF THE INTERACTION EIKONALS')
0415 c-------------------------------------------------
0416 ************************************************************************
0417 c-------------------------------------------------
0418 c Interaction cross sections
0419 c Factors for interaction eikonals calculation
0420 c (convolution of the hard cross-sections with partons structure functions)
0421 c - to be used in the PSPSFAZ procedure
0422 c-------------------------------------------------
0423       IA(1)=1
0424 c-------------------------------------------------
0425       DO 21 IE=1,10
0426 c Energy of the interaction (per nucleon)
0427       E0N=10.D0**IE
0428 c-------------------------------------------------
0429 c Energy dependent factors:
0430 c WP0, WM0 - initial light cone momenta for the interaction (E+-p)
0431       S=2.D0*E0N*AMN
0432 c Y0 - total rapidity range for the interaction
0433       Y0=DLOG(S)
0434 
0435 c Type of the incident hadron (icz = 1: pion, 2: nucleon, 3: kaon, etc
0436       DO 21 ICZ=1,5
0437 c RS - soft pomeron elastic scattering slope (lambda_ab)
0438       RS=RQ(ICZ)+ALFP*Y0
0439 c RS0 - initial slope (sum of the pomeron-hadron vertices slopes squared - R_ab)
0440       RS0=RQ(ICZ)
0441 c FS - factor for pomeron eikonal calculation
0442 c                            (gamma_ab * s**del /lambda_ab * C_ab
0443       FS=FP(ICZ)*EXP(Y0*DEL)/RS*CD(ICZ)
0444 c RP1 - factor for the impact parameter dependence of the eikonal ( in fm^2 )
0445       RP1=RS*4.D0*.0391D0/AM**2
0446 c Factor for cross-sections calculation ( in mb )
0447       G0=PI*RP1/CD(ICZ)*AM**2*10.D0
0448 c SJV - valence-valence cross-section (divided by 8*pi*lambda_ab)
0449       SJV(IE,ICZ)=QGSPSHARD(S,ICZ)
0450       SJV0=SJV(IE,ICZ)
0451 
0452       DO 19 I=1,5
0453       DO 19 M=1,3
0454       Z=.2D0*I
0455 c Eikonals for gluon-gluon and valence-gluon semihard interactions
0456 c (m=1 - gg, 2 - qg, 3 - gq);
0457 c Z - impact parameter factor ( exp(-b**2/R_p) )
0458       M1=M+3*(ICZ-1)
0459       FJS(IE,I,M1)=DLOG(QGSPSFSH(S,Z,ICZ,M-1)/Z)
0460       FJS0(I,M)=FJS(IE,I,M1)
0461 19    CONTINUE
0462 
0463       DO 20 IIA=1,4
0464 c Target mass number IA(2)
0465       IA(2)=4**(IIA-1)
0466       IF(DEBUG.GE.1)WRITE (MONIOU,206)E0N,TY(ICZ),IA(2)
0467 206   FORMAT(2X,'QGSPSAINI: INITIAL PARTICLE ENERGY:',E10.3,2X,
0468      *'ITS TYPE:',A7,2X,'TARGET MASS NUMBER:',I2)
0469 c-------------------------------------------------
0470 c Nuclear radii
0471       IF(IA(2).GT.10)THEN
0472 c RD - Wood-Saxon density radius (fit to the data of Murthy et al.)
0473         RD(2)=0.7D0*FLOAT(IA(2))**.446/AM
0474       ELSE
0475 c RD - gaussian density radius (for light nucleus)
0476         RD(2)=.9D0*FLOAT(IA(2))**.3333/AM
0477       ENDIF
0478 
0479       IF(IA(2).EQ.1)THEN
0480 c Hadron-proton interaction
0481 c BM - impact parameter cutoff value
0482         BM=2.D0*DSQRT(RP1)
0483 c XXFZ - impact parameter integration for the hadron-nucleon interaction eikonal;
0484 c GZ0 - total and absorptive cross-sections (up to a factor); first parameter is
0485 c used only in case of hadron-nucleus interaction (to make convolution with target
0486 c nucleus profile function)
0487         CALL XXFZ(0.D0,GZ0)
0488         if (debug .ge.1) write (moniou,*)gz0
0489 c GTOT - total cross-section
0490         GTOT=G0*GZ0(1)
0491 c GABS - cut pomerons cross-section
0492         GABS=G0*GZ0(2)*.5D0
0493 c GD0 - cross-section for the cut between pomerons
0494         GD0=GTOT-GABS
0495 c GDP - projectile diffraction cross section
0496         GDP=(1.D0-CC(ICZ))*CC(2)*GD0
0497 c GDT - target diffraction cross section
0498         GDT=(1.D0-CC(2))*CC(ICZ)*GD0
0499 c  GDD - double diffractive cross section
0500         GDD=(1.D0-CC(ICZ))*(1.D0-CC(2))*GD0
0501 c GIN - inelastic cross section
0502         GIN=GABS+GDP+GDT+GDD
0503         GEL=GD0*CC(ICZ)*CC(2)
0504 c
0505         IF(DEBUG.GE.1)WRITE (MONIOU,225)GTOT,GIN,GEL,GDP,GDT,GDD
0506 c
0507 225     FORMAT(2X,'QGSPSAINI: HADRON-PROTON CROSS SECTIONS:'/
0508      *  4X,'GTOT=',E10.3,2X,'GIN=',E10.3,2X,'GEL=',E10.3/4X,
0509      *  'GDIFR_PROJ=',E10.3,2X,'GDIFR_TARG=',E10.3,2X,
0510      *  'G_DOUBLE_DIFR',E10.3)
0511 c GZ - probability to have target diffraction
0512         GZ(IE,ICZ,IIA)=GDT/GIN
0513         GZP(IE,ICZ,IIA)=(GDP+GDD)/GIN   ! so00
0514 C??????
0515         GSECT(IE,ICZ,IIA)=LOG(GIN)
0516 C??????
0517       ELSE
0518 
0519 c Hadron-nucleus interaction
0520 c BM - impact parameter cutoff value
0521         BM=RD(2)+DLOG(29.D0)
0522 c RRR - Wood-Saxon radius for the target nucleus
0523         RRR=RD(2)
0524 c RRRM - auxiliary parameter for numerical integration
0525         RRRM=RRR+DLOG(9.D0)
0526 c ANORM - nuclear density normalization factor multiplied by RP1
0527         ANORM=1.5D0/PI/RRR**3/(1.D0+(PI/RRR)**2)*RP1
0528 
0529 c GAU(GZ) - cross sections calculation ( integration over impact parameters less than
0530 c BM )
0531         CALL XXGAU(GZ1)
0532 c GAU1(GZ) - cross sections calculation ( integration over impact
0533 c parameters greater than BM )
0534         CALL XXGAU1(GZ1)
0535 c GIN - total inelastic cross section
0536         GIN=GZ1(1)+GZ1(2)+GZ1(3)
0537 c
0538         IF(DEBUG.GE.1)WRITE (MONIOU,224)
0539      *  GIN*10.D0,GZ1(1)*10.D0,GZ1(2)*10.D0
0540 c
0541 224     FORMAT(2X,'QGSPSAINI: HADRON-NUCLEUS CROSS SECTIONS:'/
0542      *  4X,'GIN=',E10.3,2X,'GDIFR_TARG=',E10.3,2X,
0543      *  'GDIFR_PROJ=',E10.3)
0544 c GZ - probability to have target diffraction
0545         GZ(IE,ICZ,IIA)=GZ1(1)/GIN
0546         GZP(IE,ICZ,IIA)=GZ1(2)/GIN   ! so00
0547 C??????
0548         GIN=GIN*10.
0549         GSECT(IE,ICZ,IIA)=LOG(GIN)
0550 C??????
0551       ENDIF
0552 20    CONTINUE
0553 21    CONTINUE
0554 
0555 c Rejection functions calculation - to be interpolated in the RJINT procedure
0556       DO 23 I=1,50
0557 c Rapidity range tabulation for the hard interaction
0558       YJ=AQT0+.5D0*I
0559 c Rejection function for valence quark energy distribution
0560       RJV(I)=PSREJV(EXP(YJ))
0561 
0562       DO 22 J=1,5
0563       DO 22 M=1,2
0564       Z=.2D0*J
0565       DO 22 ICZ=1,5
0566 c RS0 - initial slope (sum of the pomeron-hadron vertices slopes squared - R_ab)
0567       RS0=RQ(ICZ)
0568       M1=M+2*(ICZ-1)
0569 c Rejection function for semihard block energy distribution  (m=1 - gg,
0570 c 2 - qg)
0571       RJS(I,J,M1)=PSREJS(EXP(YJ),Z,M-1)
0572 22    CONTINUE
0573 23    CONTINUE
0574 
0575 ctp        IF(DEBUG.GE.1)WRITE (MONIOU,212)
0576         WRITE (MONIOU,212)
0577 212     FORMAT(2X,'PSAINI: HARD CROSS SECTIONS ARE WRITTEN TO THE FILE'
0578      *  ,' QGSDAT01')
0579         IF(IFDAT.NE.1)THEN
0580           OPEN(1,FILE='QGSDAT01',STATUS='unknown')
0581         ELSE                                                  !ctp
0582           OPEN(IFDAT,FILE=FNDAT(1:NFNDAT),STATUS='unknown')
0583         ENDIF
0584         WRITE (1,*)CSBORN,CS0,CSTOT,CSQ,CSBQ,
0585      *  FSUD,QRT,SJV,FJS,RJV,RJS,GZ,GZP,GSECT
0586         CLOSE(1)
0587       ENDIF
0588 ************************************************************************
0589 
0590 cdh 8/10/98
0591 c Nuclear cross sections
0592       IF(IFNCS.NE.2)THEN
0593         INQUIRE(FILE='SECTNU',EXIST=LCALC)
0594       ELSE                                                  !ctp
0595         INQUIRE(FILE=FNNCS(1:NFNNCS),EXIST=LCALC)
0596       ENDIF
0597       IF(LCALC)then
0598         IF(DEBUG.GE.1)WRITE (MONIOU,208)
0599 208     FORMAT(2X,'PSAINI: NUCLEAR CROSS SECTIONS READOUT FROM THE FILE'
0600      *  ,' SECTNU')
0601         IF(IFNCS.NE.2)THEN
0602           OPEN(2,FILE='SECTNU',STATUS='OLD')
0603         ELSE                                                  !ctp
0604           OPEN(IFNCS,FILE=FNNCS(1:NFNNCS),STATUS='OLD')
0605         ENDIF
0606         READ (2,*)QGSASECT
0607         CLOSE(2)
0608       ELSE
0609 cdh     NITER=1000          !NUMBER OF ITERATIONS
0610         NITER=5000          !NUMBER OF ITERATIONS
0611         DO IE=1,10
0612           E0N=10.D0**IE
0613         DO IIA1=1,6
0614           IAP=2**IIA1
0615         DO IIA2=1,4
0616           IAT=4**(IIA2-1)
0617 ctp          IF(DEBUG.GE.1)WRITE (MONIOU,207)E0N,IAP,IAT
0618           WRITE (MONIOU,207)E0N,IAP,IAT
0619 207       FORMAT(2X,'QGSPSAINI: INITIAL NUCLEUS ENERGY:',E10.3,2X,
0620      *    'PROJECTILE MASS:',I2,2X,'TARGET MASS:',I2)
0621           CALL XXAINI(E0N,2,IAP,IAT)
0622           CALL CROSSC(NITER,GTOT,GPROD,GABS,GDD,GQEL,GCOH)
0623           IF(DEBUG.GE.1)WRITE (MONIOU,209)
0624      *    GTOT,GPROD,GABS,GDD,GQEL,GCOH
0625 c         WRITE (*,*)GTOT,GPROD
0626 209       FORMAT(2X,'GTOT',D10.3,'  GPROD',D10.3,' GABS',D10.3/2X,
0627      *    'GDD',D10.3,'  GQEL',D10.3,' GCOH',D10.3)
0628           QGSASECT(IE,IIA1,IIA2)=LOG(GPROD)
0629         ENDDO
0630         ENDDO
0631         ENDDO
0632         IF(IFNCS.NE.2)THEN
0633           OPEN(2,FILE='SECTNU',STATUS='UNKNOWN')
0634         ELSE                                                  !ctp
0635           OPEN(IFNCS,FILE=FNNCS(1:NFNNCS),STATUS='UNKNOWN')
0636         ENDIF
0637         WRITE (2,*)QGSASECT
0638         CLOSE(2)
0639       ENDIF
0640 cdh  end
0641       IF(DEBUG.GE.3)WRITE (MONIOU,218)
0642 218   FORMAT(2X,'QGSPSAINI - END')
0643       RETURN
0644       END
0645 C=======================================================================
0646 
0647         FUNCTION PSAPINT(X,J,L)
0648 c PSAPINT - integrated Altarelli-Parisi function
0649 c X - light cone momentum share value,
0650 c J - type of initial parton (0 - g, 1 - q)
0651 c L - type of final parton (0 - g, 1 - q)
0652 C-----------------------------------------------------------------------
0653         IMPLICIT DOUBLE PRECISION (A-H,O-Z)
0654         INTEGER DEBUG
0655         COMMON /Q_AREA43/ MONIOU
0656         COMMON /Q_DEBUG/  DEBUG
0657         SAVE
0658 
0659         IF(DEBUG.GE.2)WRITE (MONIOU,201)X,J,L
0660 201     FORMAT(2X,'PSAPINT: X=',E10.3,2X,'J= ',I1,2X,'L= ',I1)
0661         IF(J.EQ.0)THEN
0662           IF(L.EQ.0)THEN
0663             PSAPINT=6.D0*(DLOG(X/(1.D0-X))-X**3/3.D0+X**2/2.D0-2.D0*X)
0664           ELSE
0665             PSAPINT=3.D0*(X+X**3/1.5D0-X*X)
0666           ENDIF
0667         ELSE
0668           IF(L.EQ.0)THEN
0669             PSAPINT=(DLOG(X)-X+.25D0*X*X)/.375D0
0670           ELSE
0671             Z=1.D0-X
0672             PSAPINT=-(DLOG(Z)-Z+.25D0*Z*Z)/.375D0
0673           ENDIF
0674         ENDIF
0675         IF(DEBUG.GE.2)WRITE (MONIOU,202)PSAPINT
0676 202     FORMAT(2X,'PSAPINT=',E10.3)
0677         RETURN
0678         END
0679 C=======================================================================
0680 
0681       SUBROUTINE PSASET
0682 c Common model parameters setting
0683 c-----------------------------------------------------------------------
0684       IMPLICIT DOUBLE PRECISION (A-H,O-Z)
0685       INTEGER DEBUG
0686       CHARACTER*7 TY
0687       COMMON /Q_AREA15/ FP(5),RQ(5),CD(5)
0688       COMMON /Q_AREA17/ DEL,RS,RS0,FS,ALFP,RR,SH,DELH
0689       COMMON /Q_AREA18/ ALM,QT0,QLOG,QLL,AQT0,QTF,BET,AMJ0
0690       COMMON /Q_AREA25/ AHV(5)
0691       COMMON /Q_AREA26/ FACTORK
0692       COMMON /Q_AREA41/ TY(5)
0693       COMMON /Q_AREA43/ MONIOU
0694       COMMON /Q_DEBUG/  DEBUG
0695       COMMON /Q_QGSNEX1/ XA,XB,BQGS,BMAXQGS,BMAXNEX,BMINNEX     !ctp
0696       DIMENSION XA(210,3),XB(210,3)
0697       SAVE
0698 
0699         IF(DEBUG.GE.1)WRITE (MONIOU,210)
0700 210     FORMAT(2X,'PSASET - COMMON MODEL PARAMETERS SETTING')
0701 
0702       BQGS=0.d0            !ctp used to link with nexus
0703       BMAXQGS=0.d0         !ctp used to link with nexus
0704       BMAXNEX=-1.d0         !ctp used to link with nexus
0705       BMINNEX=0.d0         !ctp used to link with nexus
0706 
0707 c Soft pomeron parameters:
0708 c DEL - overcriticity,
0709 c ALFP - trajectory slope;
0710 c FP(i) - vertices for pomeron-hadrons interaction (gamma(i)*gamma(proton)),
0711 c RQ(i) - vertices slopes (R(i)**2+R(proton)**2),
0712 c CD(i) - shower enhancement coefficients
0713 c (i=1,...5 - pion,proton,kaon,D-meson,Lambda_C ),
0714 c (Kaidalov et al., Sov.J.Nucl.Phys.,1984 - proton and pion parameters)
0715       DEL=.07D0
0716       ALFP=.21D0
0717 
0718       FP(1)=2.43D0
0719       RQ(1)=2.4D0
0720       CD(1)=1.6D0
0721 
0722       FP(2)=3.64D0
0723       RQ(2)=3.56D0
0724       CD(2)=1.5D0
0725 
0726       FP(3)=1.75D0
0727       RQ(3)=2.D0
0728       CD(3)=1.7D0
0729 
0730       FP(4)=1.21D0
0731       RQ(4)=1.78D0
0732       CD(4)=2.0D0
0733 
0734       FP(5)=2.43D0
0735       RQ(5)=2.4D0
0736       CD(5)=2.0D0
0737 
0738 c-------------------------------------------------
0739 c Hard interaction parameters:
0740 c ALM  - Lambda_QCD squared,
0741 c QT0  - Q**2 cutoff,
0742 c RR   - vertex constant square for soft pomeron interaction with the hard block (r**2),;
0743 c BET  - gluon structure function parameter for the soft pomeron ((1-x)**BET),
0744 c AMJ0 - jet mass,
0745 c QTF  - Q**2 cutoff for the timelike evolution,
0746 c FACTORK - K-factor value;
0747 c DELH is not a parameter of the model; it is used only for energy sharing
0748 c procedure - initially energy is shared according to s**DELH dependence
0749 c for the hard interaction cross-section and then rejection is used according
0750 c to real Sigma_hard(s) dependence.
0751       ALM=.04D0
0752       RR=.35D0     !  produces 76 mbarn for p-pbar at Tevatron energies
0753 cdh   RR=.53D0     !  produces 80 mbarn for p-pbar at Tevatron energies
0754       QT0=4.D0
0755       BET=1.D0
0756       DELH=0.25D0
0757       AMJ0=0.D0
0758       QTF=.5D0
0759       FACTORK=2.D0
0760 
0761 c-------------------------------------------------
0762 c Valence quark structure functions for the hard scattering
0763 c (~1/sqrt(x)*(1-x)**AHV(i), i=1,...5 corresponds to pion, nucleon etc.)
0764       AHV(1)=1.5D0
0765       AHV(2)=2.5D0
0766       AHV(3)=2.D0
0767       AHV(4)=4.D0
0768       AHV(5)=5.D0
0769 c Initial particle types
0770       TY(1)='pion   '
0771       TY(2)='nucleon'
0772       TY(3)='kaon   '
0773       TY(4)='D-meson'
0774       TY(5)='LambdaC'
0775       RETURN
0776       END
0777 C=======================================================================
0778 
0779         FUNCTION QGSPSBINT(QQ,S,M,L)
0780 C QGSPSBINT - Born cross-section interpolation
0781 c QQ - effective momentum cutoff for the scattering,
0782 c S - total c.m. energy squared for the scattering,
0783 c M - parton type at current end of the ladder (1 - g, 2 - q)
0784 c L - parton type at opposite end of the ladder (1 - g, 2 - q)
0785 C-----------------------------------------------------------------------
0786         IMPLICIT DOUBLE PRECISION (A-H,O-Z)
0787         INTEGER DEBUG
0788         DIMENSION WI(3),WK(3)
0789         COMMON /Q_AREA18/ ALM,QT0,QLOG,QLL,AQT0,QTF,BET,AMJ0
0790         COMMON /Q_AREA31/ CSJ(17,68)
0791         COMMON /Q_AREA43/ MONIOU
0792         COMMON /Q_DEBUG/  DEBUG
0793         SAVE
0794 
0795         IF(DEBUG.GE.2)WRITE (MONIOU,201)QQ,S,M,L
0796 201     FORMAT(2X,'QGSPSBINT: QQ=',E10.3,2X,'S= ',E10.3,2X,'M= ',I1,2X,
0797      *  'L= ',I1)
0798         QGSPSBINT=0.D0
0799         IF(S.LE.MAX(4.D0*QT0,QQ))THEN
0800         IF(DEBUG.GE.3)WRITE (MONIOU,202)QGSPSBINT
0801 202     FORMAT(2X,'QGSPSBINT=',E10.3)
0802           RETURN
0803         ENDIF
0804 
0805         ML=17*(M-1)+34*(L-1)
0806         QLI=DLOG(QQ/QT0)/1.38629d0
0807         SL=DLOG(S/QT0)/1.38629d0
0808         SQL=SL-QLI
0809         I=INT(QLI)
0810         K=INT(SL)
0811         IF(I.GT.13)I=13
0812 
0813         IF(SQL.GT.10.D0)THEN
0814           IF(K.GT.14)K=14
0815           WI(2)=QLI-I
0816           WI(3)=WI(2)*(WI(2)-1.D0)*.5D0
0817           WI(1)=1.D0-WI(2)+WI(3)
0818           WI(2)=WI(2)-2.D0*WI(3)
0819           WK(2)=SL-K
0820           WK(3)=WK(2)*(WK(2)-1.D0)*.5D0
0821           WK(1)=1.D0-WK(2)+WK(3)
0822           WK(2)=WK(2)-2.D0*WK(3)
0823 
0824           DO 1 I1=1,3
0825           DO 1 K1=1,3
0826 1         QGSPSBINT=QGSPSBINT+CSJ(I+I1,K+K1+ML)*WI(I1)*WK(K1)
0827           QGSPSBINT=EXP(QGSPSBINT)
0828         ELSEIF(SQL.LT.1.D0.AND.I.NE.0)THEN
0829           SQ=(S/QQ-1.D0)/3.D0
0830           WI(2)=QLI-I
0831           WI(3)=WI(2)*(WI(2)-1.D0)*.5D0
0832           WI(1)=1.D0-WI(2)+WI(3)
0833           WI(2)=WI(2)-2.D0*WI(3)
0834 
0835           DO 2 I1=1,3
0836           I2=I+I1
0837           K2=I2+1+ML
0838 2         QGSPSBINT=QGSPSBINT+CSJ(I2,K2)*WI(I1)
0839           QGSPSBINT=EXP(QGSPSBINT)*SQ
0840         ELSEIF(K.EQ.1)THEN
0841           SQ=(S/QT0/4.D0-1.D0)/3.D0
0842           WI(2)=QLI
0843           WI(1)=1.D0-QLI
0844 
0845           DO 3 I1=1,2
0846 3         QGSPSBINT=QGSPSBINT+CSJ(I1,3+ML)*WI(I1)
0847           QGSPSBINT=EXP(QGSPSBINT)*SQ
0848         ELSEIF(K.LT.15)THEN
0849           KL=INT(SQL)
0850           IF(I+KL.GT.12)I=12-KL
0851           IF(I+KL.EQ.1)KL=2
0852           WI(2)=QLI-I
0853           WI(3)=WI(2)*(WI(2)-1.D0)*.5D0
0854           WI(1)=1.D0-WI(2)+WI(3)
0855           WI(2)=WI(2)-2.D0*WI(3)
0856           WK(2)=SQL-KL
0857           WK(3)=WK(2)*(WK(2)-1.D0)*.5D0
0858           WK(1)=1.D0-WK(2)+WK(3)
0859           WK(2)=WK(2)-2.D0*WK(3)
0860 
0861           DO 4 I1=1,3
0862           I2=I+I1
0863           DO 4 K1=1,3
0864           K2=I2+KL+K1-1+ML
0865 4         QGSPSBINT=QGSPSBINT+CSJ(I2,K2)*WI(I1)*WK(K1)
0866           QGSPSBINT=EXP(QGSPSBINT)
0867 
0868         ELSE
0869           K=15
0870           IF(I.GT.K-3)I=K-3
0871           WI(2)=QLI-I
0872           WI(3)=WI(2)*(WI(2)-1.D0)*.5D0
0873           WI(1)=1.D0-WI(2)+WI(3)
0874           WI(2)=WI(2)-2.D0*WI(3)
0875           WK(2)=SL-K
0876           WK(1)=1.D0-WK(2)
0877 
0878           DO 5 I1=1,3
0879           DO 5 K1=1,2
0880 5         QGSPSBINT=QGSPSBINT+CSJ(I+I1,K+K1+ML)*WI(I1)*WK(K1)
0881           QGSPSBINT=EXP(QGSPSBINT)
0882         ENDIF
0883         IF(DEBUG.GE.3)WRITE (MONIOU,202)QGSPSBINT
0884         RETURN
0885         END
0886 C=======================================================================
0887 
0888         FUNCTION QGSPSBORN(QQ,S,IQ1,IQ2)
0889 c PSFBORN -hard 2->2 parton scattering Born cross-section
0890 c S is the c.m. energy square for the scattering process,
0891 c IQ1 - parton type at current end of the ladder (0 - g, 1,2 - q)
0892 c IQ2 - parton type at opposite end of the ladder (0 - g, 1,2 - q)
0893 c-----------------------------------------------------------------------
0894         IMPLICIT DOUBLE PRECISION (A-H,O-Z)
0895         INTEGER DEBUG
0896         COMMON /Q_AREA6/  PI,BM,AM
0897         COMMON /Q_AREA18/ ALM,QT0,QLOG,QLL,AQT0,QTF,BET,AMJ0
0898         COMMON /Q_AREA26/ FACTORK
0899         COMMON /Q_AREA43/ MONIOU
0900         COMMON /Q_DEBUG/  DEBUG
0901         COMMON /Q_AR13/  X1(7),A1(7)
0902         SAVE
0903 
0904         IF(DEBUG.GE.2)WRITE (MONIOU,201)QQ,S,IQ1,IQ2
0905 201     FORMAT(2X,'QGSPSBORN: QQ=',E10.3,2X,'S= ',E10.3,2X,'IQ1= ',I1
0906      *  ,2X,'IQ2= ',I1)
0907         TMIN=S*(.5D0-DSQRT(.25D0-QT0/S))
0908         TMIN=MAX(TMIN,S*QQ/(S+QQ))
0909 
0910         IF(IQ1*IQ2.EQ.0)THEN
0911           IQ=IQ2
0912         ELSE
0913           IQ=2
0914         ENDIF
0915 
0916         QGSPSBORN=0.D0
0917         DO 1 I=1,7
0918         DO 1 M=1,2
0919         T=2.D0*TMIN/(1.D0+2.D0*TMIN/S-X1(I)*(2*M-3)*(1.D0-2.D0*TMIN/S))
0920         QT=T*(1.D0-T/S)
0921         FB=PSFBORN(S,T,IQ1,IQ)+PSFBORN(S,S-T,IQ1,IQ)
0922 1       QGSPSBORN=QGSPSBORN+A1(I)*FB/DLOG(QT/ALM)**2*T**2
0923         QGSPSBORN=QGSPSBORN*(.5D0/TMIN-1.D0/S)*FACTORK*PI**3/2.25D0**2
0924      &            /S**2
0925         IF(IQ1.EQ.0.AND.IQ2.EQ.0)QGSPSBORN=QGSPSBORN*.5D0
0926         IF(DEBUG.GE.3)WRITE (MONIOU,202)QGSPSBORN
0927 202     FORMAT(2X,'QGSPSBORN=',E10.3)
0928         RETURN
0929         END
0930 C=======================================================================
0931 
0932         SUBROUTINE PSCAJET(QQ,IQ1,QV,ZV,QM,IQV,LDAU,LPAR,JQ)
0933 c Final state emission process (all branchings as well as parton masses
0934 c are determined)
0935 C-----------------------------------------------------------------------
0936 c QQ - maximal effective momentum transfer for the first branching
0937 c IQ1, IQ2 - initial jet flavours in forward and backward direction
0938 c (0 - for gluon)
0939 c QV(i,j) - effective momentum for the branching of the parton in i-th row
0940 c on j-th level (0 - in case of no branching)  - to be determined
0941 c ZV(i,j) - Z-value for the branching of the parton in i-th row
0942 c on j-th level - to be determined
0943 c QM(i,j) - mass squared for the parton in i-th row
0944 c on j-th level - to be determined
0945 c IQV(i,j) - flavour for the parton in i-th row on j-th level
0946 c - to be determined
0947 c LDAU(i,j) - first daughter row for the branching of the parton in i-th row
0948 c on j-th level - to be determined
0949 c LPAR(i,j) - the parent row for the parton in i-th row
0950 c on j-th level - to be determined
0951         IMPLICIT DOUBLE PRECISION (A-H,O-Z)
0952         INTEGER DEBUG
0953         DIMENSION QMAX(30,50),IQM(2),LNV(50),
0954      *  QV(30,50),ZV(30,50),QM(30,50),IQV(30,50),
0955      *  LDAU(30,49),LPAR(30,50)
0956 
0957         COMMON /Q_AREA11/ B10
0958         COMMON /Q_AREA18/ ALM,QT0,QLOG,QLL,AQT0,QTF,BET,AMJ0
0959         COMMON /Q_AREA43/ MONIOU
0960         COMMON /Q_DEBUG/  DEBUG
0961 
0962         SAVE
0963         EXTERNAL PSRAN
0964 
0965         IF(DEBUG.GE.2)WRITE (MONIOU,201)QQ,IQ1,JQ
0966 201     FORMAT(2X,'PSCAJET: QQ=',E10.3,2X,'IQ1= ',I1,2X,'JQ=',I1)
0967 
0968         DO 1 I=2,20
0969 1        LNV(I)=0
0970         LNV(1)=1
0971         QMAX(1,1)=QQ
0972         IQV(1,1)=IQ1
0973         NLEV=1
0974         NROW=1
0975 
0976 2        QLMAX=DLOG(QMAX(NROW,NLEV)/QTF/16.D0)
0977          IQ=MIN(1,IABS(IQV(NROW,NLEV)))+1
0978 
0979         IF(PSRAN(B10).GT.PSUDINT(QLMAX,IQ))THEN
0980           Q=PSQINT(QLMAX,PSRAN(B10),IQ)
0981           Z=PSZSIM(Q,IQ)
0982 
0983           LL=LNV(NLEV+1)+1
0984           LDAU(NROW,NLEV)=LL
0985           LPAR(LL,NLEV+1)=NROW
0986           LPAR(LL+1,NLEV+1)=NROW
0987           LNV(NLEV+1)=LL+1
0988 
0989           IF(IQ.NE.1)THEN
0990             IF((3-2*JQ)*IQV(NROW,NLEV).GT.0)THEN
0991               IQM(1)=0
0992               IQM(2)=IQV(NROW,NLEV)
0993             ELSE
0994               IQM(2)=0
0995               IQM(1)=IQV(NROW,NLEV)
0996               Z=1.D0-Z
0997             ENDIF
0998           ELSE
0999 *********************************************************
1000             WG=QGSPSFAP(Z,0,0)
1001 *********************************************************
1002             WG=WG/(WG+QGSPSFAP(Z,0,1))
1003             IF(PSRAN(B10).LT.WG)THEN
1004               IQM(1)=0
1005               IQM(2)=0
1006             ELSE
1007               IQM(1)=INT(3.D0*PSRAN(B10)+1.D0)*(3-2*JQ)
1008               IQM(2)=-IQM(1)
1009             ENDIF
1010             IF(PSRAN(B10).LT..5D0)Z=1.D0-Z
1011           ENDIF
1012 
1013           QV(NROW,NLEV)=Q
1014           ZV(NROW,NLEV)=Z
1015 
1016           NROW=LL
1017           NLEV=NLEV+1
1018           QMAX(NROW,NLEV)=Q*Z**2
1019           QMAX(NROW+1,NLEV)=Q*(1.D0-Z)**2
1020           IQV(NROW,NLEV)=IQM(1)
1021           IQV(NROW+1,NLEV)=IQM(2)
1022         IF(DEBUG.GE.3)WRITE (MONIOU,203)NLEV,NROW,Q,Z
1023 203     FORMAT(2X,'PSCAJET: NEW BRANCHING AT LEVEL NLEV=',I2,
1024      *  ' NROW=',I2/4X,' EFFECTIVE MOMENTUM Q=',E10.3,2X,' Z=',E10.3)
1025           GOTO 2
1026         ELSE
1027 
1028           QV(NROW,NLEV)=0.D0
1029           ZV(NROW,NLEV)=0.D0
1030           QM(NROW,NLEV)=AMJ0
1031         IF(DEBUG.GE.3)WRITE (MONIOU,204)NLEV,NROW
1032 204     FORMAT(2X,'PSCAJET: NEW FINAL JET AT LEVEL NLEV=',I2,
1033      *  ' NROW=',I2)
1034         ENDIF
1035 
1036 4       CONTINUE
1037       IF(NLEV.EQ.1)THEN
1038         IF(DEBUG.GE.3)WRITE (MONIOU,202)
1039 202     FORMAT(2X,'PSCAJET - END')
1040         RETURN
1041       ENDIF
1042         LPROW=LPAR(NROW,NLEV)
1043 
1044         IF(LDAU(LPROW,NLEV-1).EQ.NROW)THEN
1045           NROW=NROW+1
1046           GOTO 2
1047         ELSE
1048           Z=ZV(LPROW,NLEV-1)
1049           QM(LPROW,NLEV-1)=Z*(1.D0-Z)*QV(LPROW,NLEV-1)
1050      *          +QM(NROW-1,NLEV)/Z+QM(NROW,NLEV)/(1.D0-Z)
1051           NROW=LPROW
1052           NLEV=NLEV-1
1053         IF(DEBUG.GE.3)WRITE (MONIOU,205)NLEV,NROW,QM(LPROW,NLEV)
1054 205     FORMAT(2X,'PSCAJET: JET MASS AT LEVEL NLEV=',I2,
1055      *  ' NROW=',I2,' - QM=',E10.3)
1056           GOTO 4
1057         ENDIF
1058         END
1059 C=======================================================================
1060 
1061       SUBROUTINE PSCONF
1062 c Simulation of the interaction configuration: impact parameter, nucleons positions,
1063 c numbers of cut soft pomerons and semihard blocks, their connections.
1064 c-----------------------------------------------------------------------
1065       IMPLICIT DOUBLE PRECISION (A-H,O-Z)
1066       INTEGER DEBUG
1067 c XA(56,3),XB(56,3) - arrays for projectile and target nucleons positions recording,
1068 c FHARD(i) give the factors to the scattering amplitude due to
1069 c valence quark-gluon (i=1),  gluon-valence quark (i=2) and
1070 c valence quark-valence quark (i=3) interactions
1071 cdh   DIMENSION XA(56,3),XB(56,3),FHARD(3)
1072       DIMENSION XA(210,3),XB(210,3),FHARD(3)
1073       COMMON /Q_QGSNEX1/ XA,XB,BQGS,BMAXQGS,BMAXNEX,BMINNEX      !ctp
1074       COMMON /Q_AREA1/  IA(2),ICZ,ICP
1075       COMMON /Q_AREA2/  S,Y0,WP0,WM0
1076       COMMON /Q_AREA6/  PI,BM,AM
1077 c Arrays for interaction configuration recording:
1078 c LQA(i) (LQB(j)) - numbers of cut soft pomerons, connected to i-th projectile
1079 c (j-th target) nucleon (hadron);
1080 c LHA(i) (LHB(j)) - the same for hard pomerons numbers;
1081 c IAS(k) (IBS(k)) - number (position in array) of the projectile (target) nucleon,
1082 c connected to k-th block of soft pomerons;
1083 c NQS(k) - number of soft pomerons in k-th block;
1084 c IAH(k) (IBH(k)) - number (position in array) of the projectile (target) nucleon,
1085 c connected to k-th hard pomeron;
1086 c ZH(k) - impact parameter between the two nucleons connected to k-th hard pomeron
1087 c (more exactly exp(-b**2/RP1));
1088 c LVA(i)=1 if valence quark from i-th nucleon (i=1 for hadron) is involved into
1089 c the hard interaction and LVA(i)=0 otherwise, LVB(j) - similar.
1090       COMMON /Q_AREA9/  LQA(56),LQB(56),NQS(1000),IAS(1000),IBS(1000),
1091      *                LHA(56),LHB(56),ZH(4000),IAH(4000),IBH(4000),
1092      *                IQH(4000),LVA(56),LVB(56)
1093       COMMON /Q_AREA10/ STMASS,AM0,AMN,AMK,AMC,AMLAMC,AMLAM,AMETA
1094       COMMON /Q_AREA11/ B10
1095 c NSP - number of secondary particles
1096       COMMON /Q_AREA12/ NSP
1097       COMMON /Q_AREA16/ CC(5)
1098       COMMON /Q_AREA40/ JDIFR
1099       COMMON /Q_AREA43/ MONIOU
1100 **************************************************
1101       COMMON /Q_AREA45/ GDT,GDP    !so00
1102 **************************************************
1103       COMMON /Q_AREA99/ NWT
1104       COMMON /Q_DEBUG/  DEBUG
1105 
1106 ctp from epos
1107       integer ng1evt,ng2evt,ikoevt
1108       real    rglevt,sglevt,eglevt,fglevt,typevt
1109       common/c2evt/ng1evt,ng2evt,rglevt,sglevt,eglevt,fglevt,ikoevt
1110      *,typevt            !in epos.inc
1111 
1112 
1113       DIMENSION IWT(56)
1114       SAVE
1115       EXTERNAL PSRAN
1116 
1117         IF(DEBUG.GE.1)WRITE (MONIOU,201)
1118 201     FORMAT(2X,'PSCONF - CONFIGURATION OF THE INTERACTION')
1119 
1120 100     NSP=0
1121         typevt=1
1122         IF(IA(1).EQ.1)THEN
1123 **************************************************
1124           IF(JDIFR.EQ.1.AND.PSRAN(B10).LT.GDT)THEN
1125 c Target diffraction
1126             IF(IA(2).NE.1)THEN
1127 c ICT - partner target nucleon type (proton - 2 or neutron - 3)
1128               ICT=INT(2.5+PSRAN(B10))
1129             ELSE
1130 c Target proton
1131               ICT=2
1132             ENDIF
1133             WPI=WP0
1134             WMI=WM0
1135 c              write (*,*)'difr'
1136             CALL XXDTG(WPI,WMI,ICP,ICT,0)
1137             typevt=-4
1138             goto 21   !so00
1139           ELSEIF(ABS(JDIFR).EQ.1.AND.PSRAN(B10).LT.GDP)THEN  !so00
1140             IF(IA(2).NE.1)THEN  !so00
1141 c ICT - partner target nucleon type (proton - 2 or neutron - 3)
1142               ICT=INT(2.5+PSRAN(B10))  !so00
1143             ELSE  !so00
1144 c Target proton
1145               ICT=2  !so00
1146             ENDIF  !so00
1147             IF(DEBUG.GE.2)WRITE (MONIOU,206)  !so00
1148 206         FORMAT(2X,'PROJECTILE HADRON DIFFRACTION')  !so00
1149             ICP0=ICP  !so00
1150             WPI=WP0  !so00
1151             WMI=WM0  !so00
1152             LQ=0  !so00
1153             CALL XXDPR(WPI,WMI,ICP0,ICT,LQ)  !so00
1154             typevt=4
1155             goto 21   !so00
1156           ENDIF
1157 **************************************************
1158 c For hadron projectile we have given position in transverse plane;
1159 c initially primary hadron is positioned at (X,Y)=(0,0)
1160           DO 1 I=1,3
1161 1          XA(1,I)=0.D0
1162       ENDIF
1163 
1164 c-------------------------------------------------
1165 c Inelastic interaction at B<BM (usual case)
1166 c-------------------------------------------------
1167 c NW - number of wounded nucleons in the primary (NW=1 for hadron);
1168 c NT - number of target nucleons being in their active diffractive state;
1169 c LS - number of cut soft pomeron blocks (froissarons);
1170 c NHP - number of cut pomerons having hard block (referred below as hard blocks);
1171 c NQS(k) - number of cut soft pomerons in k-th block;
1172 c IAS(k) (IBS(k)) - number (position in array) of the projectile (target) nucleon,
1173 c connected to k-th block of soft pomerons;
1174 c IAH(k) (IBH(k)) - number 3(position in array) of the projectile (target) nucleon,
1175 c connected to k-th hard pomeron;
1176 c ZH(k) - impact parameter between the two nucleons connected to k-th hard pomeron
1177 c (more exactly exp(-b**2/RP1));
1178 c LQA(i) (LQB(j)) - total number of cut soft pomerons, connected to i-th projectile
1179 c (j-th target) nucleon (hadron);
1180 c LHA(i) (LHB(j)) - total number of cut hard blocks, connected to i-th projectile
1181 c (j-th target) nucleon (hadron);
1182 c LVA(i)=1 if valence quark from i-th nucleon (i=1 for hadron) is involved into
1183 c the hard interaction and LVA(i)=0 otherwise, LVB(j) - similar.
1184 c-------------------------------------------------
1185 c Initialization
1186       DO 3 I=1,IA(1)
1187         LHA(I)=0
1188         LVA(I)=0
1189 3       LQA(I)=0
1190         DO 4 I=1,IA(2)
1191         LHB(I)=0
1192         LVB(I)=0
1193 4       LQB(I)=0
1194 
1195 c-------------------------------------------------
1196 c The beginning
1197 5       CONTINUE
1198 **************************************************
1199         IF(IA(2).NE.1)THEN  !changed!!!!!!!!! dh 8/10/98
1200 c For target nucleus number of target nucleons being in their active
1201 c diffractive state is simulated (for each nucleon probability equals
1202 c 1./C_n,  - shower enhancenment coefficient)
1203           NT=0
1204           DO 6 I=1,IA(2)
1205 6         NT=NT+INT(CC(2)+PSRAN(B10))
1206 c In case of no active target nucleon the event is rejected
1207           IF(NT.EQ.0)GOTO 5
1208         IF(DEBUG.GE.3)WRITE (MONIOU,203)NT
1209 203     FORMAT(2X,'PSCONF: NUMBER OF ACTIVE TARGET NUCLEONS NT=',
1210      *  I2)
1211 c PSGEA(NT,XB,2) - target nucleons positions simulation:
1212 cdh       CALL PSGEA(NT,XB,2)  !changed!!!!!!!!!
1213           CALL PSGEA(IA(2),XB,2)  !changed!!!!!!!!! 25.03.99
1214 c NT - number of target nucleons being in their active diffractive state;
1215 c XB(i,n) - n-th nucleon coordinates (i=1,2,3 corresponds to x,y,z);
1216 c parameter 2 means target
1217         ELSE                   !changed!!!!!!!!! dh 8/10/98
1218           NT=1                 !changed!!!!!!!!! dh 8/10/98
1219           XB(1,1)=0.D0         !changed!!!!!!!!! dh 8/10/98
1220           XB(1,2)=0.D0         !changed!!!!!!!!! dh 8/10/98
1221         ENDIF                  !changed!!!!!!!!! dh 8/10/98
1222 **************************************************
1223 
1224 c-------------------------------------------------
1225 c Impact parameter  square is simulated uniformly (B**2<BM**2)
1226         B=BM*DSQRT(PSRAN(B10))
1227         IF(BMAXNEX.GE.0.D0)THEN
1228          B1=BMINNEX/AM
1229          B2=MIN(BM*AM,BMAXNEX)/AM
1230          if(B1.gt.B2)stop'bmin > bmax in QGSJet'
1231           B=DSQRT(B1*B1+(B2*B2-B1*B1)*PSRAN(B10))
1232           BQGS=B*AM                      !ctp
1233         ENDIF
1234         IF(DEBUG.GE.2)WRITE (MONIOU,204)B*AM
1235 204     FORMAT(2X,'PSCONF: IMPACT PARAMETER FOR THE INTERACTION:',
1236      *  E10.3,' FM')
1237 c PSGEA(IA(1),XA,1) - projectile nucleons positions simulation:
1238 c IA(1) - projectile nucleus mass number;
1239 c XA(i,n) - n-th nucleon coordinates (i=1,2,3 corresponds to x,y,z);
1240 c parameter 1 means projectile
1241         IF(IA(1).GT.1)CALL PSGEA(IA(1),XA,1)
1242 
1243         NW=0
1244         LS=0
1245         NS=0
1246         NHP=0
1247         DO 101 IT = 1,NT
1248           IWT(IT) = 0
1249  101    CONTINUE
1250 
1251 c-------------------------------------------------
1252 c Cycle over all projectile nucleons ( for projectile hadron we have only IN=1 )
1253         DO 14 IN=1,IA(1)
1254         IF(DEBUG.GE.2.AND.ICZ.EQ.2)WRITE (MONIOU,205)IN
1255 205     FORMAT(2X,'PSCONF: ',I2,'-TH PROJECTILE NUCLEON')
1256 c Only nucleons in their active diffractive state are considered (for each nucleon
1257 c probability equals 1./C_n, C_n = 1./CC(2) - shower enhancenment coefficient)
1258         IF(IA(1).NE.1.AND.PSRAN(B10).GT.CC(2))GOTO 12
1259 c Projectile nucleons positions are shifted according the to impact parameter B
1260         X=XA(IN,1)+B
1261         Y=XA(IN,2)
1262 
1263         IQS=0
1264         NW=NW+1
1265 c-------------------------------------------------
1266 c Cycle over all target nucleons in active state
1267         DO 11 M=1,NT
1268 c Z - b-factor for pomeron eikonal calculation (exp(-R_ij/R_p))
1269         Z=PSDR(X-XB(M,1),Y-XB(M,2))
1270 c VV - eikonal for nucleon-nucleon (hadron-nucleon) interaction
1271 c (sum of the soft and semihard eikonals)
1272         VV=2.D0*PSFAZ(Z,FSOFT,FHARD,FSHARD)
1273         EV=EXP(-VV)
1274 c EH - eikonal contribution of valence quarks hard interactions
1275         EH=FHARD(1)+FHARD(2)+FHARD(3)
1276 c        eh=0.d0
1277         AKS=PSRAN(B10)
1278 c 1.-EXP(-VV)*(1.D0-2.D0*EH) is the probability for inelastic nucleon-nucleon
1279 c (hadron-nucleon) interaction (for given nucleons positions)
1280         IF(AKS.GT.1.D0-EV*(1.D0-2.D0*EH))GOTO 11
1281         IF(DEBUG.GE.2)WRITE (MONIOU,208)M
1282 208     FORMAT(2X,'PSCONF: INTERACTION WITH',I2,'-TH TARGET NUCLEON')
1283 C  INCREMENT THE NUMBER IWT OF WOUNDED TARGET NUCLEONS
1284         IWT(M) = 1
1285 
1286 c-------------------------------------------------
1287 c IQV - type of the hard interaction: 0 - gg, 1 - qg, 2 - gq, 3 - qq
1288         IQV=0
1289 
1290 c 2*EH*EV = 2*EH*EXP(-VV) - probability for only valence quarks hard interactions
1291 c (with no one soft or semihard)
1292         SUM=2.D0*EH*EV
1293 
1294 c-------------------------------------------------
1295         IF(AKS.LT.SUM)THEN
1296           AKS1=EH*PSRAN(B10)
1297           IF(AKS1.LT.FHARD(1))THEN
1298 c Rejection in case of valence quark already involved into the interaction
1299             IF(LVA(NW).NE.0)GOTO 11
1300 c LVA(NW)=1 - valence quark-gluon interaction
1301             LVA(NW)=1
1302             IQV=1
1303           ELSEIF(AKS1.LT.FHARD(1)+FHARD(2))THEN
1304 c Rejection in case of valence quark already involved into the interaction
1305             IF(LVB(M).NE.0)GOTO 11
1306 c LVB(M)=1 - gluon-valence quark interaction
1307             LVB(M)=1
1308             IQV=2
1309           ELSE
1310 c Rejection in case of valence quarks already involved into the interaction
1311             IF(LVA(NW)+LVB(M).NE.0)GOTO 11
1312 c LVA(NW)=LVB(M)=1 - valence quark-valence quark interaction
1313             LVA(NW)=1
1314             LVB(M)=1
1315             IQV=3
1316           ENDIF
1317           N=1
1318 c LNH - number of new hard blocks (resulted from current nucleon-nucleon interaction)
1319           LNH=1
1320           GOTO 22
1321         ENDIF
1322 c-------------------------------------------------
1323 
1324 c LNH - number of new hard blocks - initialization
1325         LNH=0
1326 c WH - probability to have semihard interaction
1327         WH=2.D0*FSHARD/VV
1328 c N - number of cut pomerons (both soft ones and having hard blocks) for the
1329 c nucleon-nucleon (hadron-nucleon) interaction - is determined according to Poisson
1330 c with average value VV (twice the eikonal)
1331         DO 7 N=1,45
1332         EV=EV*VV/N
1333         SUM=SUM+EV
1334 7       IF(AKS.LT.SUM)GOTO 8
1335 
1336 c LNH - number of hard blocks for nucleon-nucleon (hadron-nucleon)
1337 c interaction (according to WH probability)
1338 8       DO 9 I=1,N
1339 9       LNH=LNH+INT(WH+PSRAN(B10))
1340 
1341 c-------------------------------------------------
1342         AKS1=.5D0*PSRAN(B10)
1343 c EH is the probability to have valence quarks interactions in addition to the
1344 c soft and semihard
1345         IF(AKS1.LT.EH)THEN
1346           IF(AKS1.LT.FHARD(1))THEN
1347             IF(LVA(NW).NE.0)GOTO 22
1348 c Valence quark-gluon interaction
1349             LVA(NW)=1
1350             IQV=1
1351           ELSEIF(AKS1.LT.FHARD(1)+FHARD(2))THEN
1352             IF(LVB(M).NE.0)GOTO 22
1353 c Gluon-valence quark interaction
1354             LVB(M)=1
1355             IQV=2
1356           ELSE
1357             IF(LVA(NW)+LVB(M).NE.0)GOTO 22
1358 c Valence quark-valence quark interaction
1359             LVA(NW)=1
1360             LVB(M)=1
1361             IQV=3
1362           ENDIF
1363           N=N+1
1364           LNH=LNH+1
1365         ENDIF
1366 
1367 22      IQS=1
1368         IF(LNH.NE.0)THEN
1369 c-------------------------------------------------
1370 c New hard blocks recording:
1371 c LNH - number of new hard blocks,
1372 c LHA(i) (LHB(j)) - total number of cut hard blocks, connected to i-th projectile
1373 c (j-th target) nucleon (hadron);
1374 c IAH(k) (IBH(k)) - number (position in array) of the projectile (target) nucleon,
1375 c connected to k-th hard block;
1376 c ZH(k) - factor exp(-R_ij/R_p) for k-th hard block;
1377 c IQH(k) - type of the hard interaction: 0 - gg, 1 - qg, 2 - gq, 3 - qq
1378 c-------------------------------------------------
1379 c N - number of cut soft pomerons
1380           N=N-LNH
1381           LHA(NW)=LHA(NW)+LNH
1382           LHB(M)=LHB(M)+LNH
1383           DO 10 I=1,LNH
1384           I1=NHP+I
1385           If (I1 .ge. 4000) then
1386             write(moniou,*)'psconf: I1 > 4000, index out of bounds'
1387             stop
1388           endif
1389           IF(I.EQ.1.AND.IQV.NE.0)THEN
1390             IQH(I1)=IQV
1391           ELSE
1392             IQH(I1)=0
1393           ENDIF
1394         IF(DEBUG.GE.2)WRITE (MONIOU,209)I1,NW,M,IQH(I1)
1395 209     FORMAT(2X,'PSCONF: ',I4,'-TH HARD BLOCK IS CONNECTED TO',1X,
1396      *  I2,'-TH PROJECTILE NUCLEON (HADRON) AND'/4X,I2,
1397      *  '-TH TARGET NUCLEON; TYPE OF THE SEMIHARD INTERACTION:',I1)
1398           ZH(I1)=Z
1399           IAH(I1)=NW
1400 10        IBH(I1)=M
1401 c-------------------------------------------------
1402 c NHP - total number of hard blocks
1403           NHP=NHP+LNH
1404         ENDIF
1405 
1406 c-------------------------------------------------
1407         IF(N.GT.0)THEN
1408 c One more block of soft pomerons; soft block characteristics recording
1409           LS=LS+1
1410           IAS(LS)=NW
1411           IBS(LS)=M
1412           LQA(NW)=LQA(NW)+N
1413           LQB(M)=LQB(M)+N
1414           NQS(LS)=N
1415         IF(DEBUG.GE.2)WRITE (MONIOU,210)LS,NW,M,N
1416 210     FORMAT(2X,'PSCONF: ',I4,'-TH SOFT BLOCK IS CONNECTED TO',1X,
1417      *  I2,'-TH PROJECTILE NUCLEON (HADRON) AND'/4X,I2,
1418      *  '-TH TARGET NUCLEON; NUMBER OF POMERONS IN THE BLOCK NP=',
1419      *  I2)
1420         ENDIF
1421 11      CONTINUE
1422 c-------------------------------------------------
1423 
1424         IF(IQS.NE.0)GOTO 14
1425 cxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
1426 c Projectile diffraction
1427 c For each projectile nucleon (hadron) diffractive dissociation probability is
1428 c (1.D0-CC(ICZ))*PSV(X,Y,XB,NT);
1429 c XXV(X,Y,XB,NT) - nucleon-nucleus scattering eikonal factor
1430 c ( (1-eikonal)**2 ) for given nucleons positions
1431 c (For projectile hadron only in case of JPERI=0, otherwise it was considered
1432 c before at any impact parameter )
1433         IF(JDIFR.EQ.1 .AND. IA(1).NE. 1
1434      *  .AND.PSRAN(B10).LT.(1.D0-CC(ICZ))*PSV(X,Y,XB,NT))THEN
1435 **************************************************
1436           IF(IA(2).NE.1)THEN
1437 c ICT - partner target nucleon type (proton - 2 or neutron - 3)
1438             ICT=INT(2.5+PSRAN(B10))
1439           ELSE
1440 c Target proton
1441             ICT=2
1442           ENDIF
1443 c Projectile nucleon
1444           IF(DEBUG.GE.2)WRITE(MONIOU,207)IN
1445 207       FORMAT(2X,I2,'-TH PROJECTILE NUCLEON DIFFRACTION')
1446           ICP0=INT(2.5+PSRAN(B10))
1447           WPI=WP0
1448           WMI=WM0
1449           IF(IA(2).EQ.1)THEN
1450             LQ=0
1451           ELSE
1452             LQ=1
1453           ENDIF
1454           CALL XXDPR(WPI,WMI,ICP0,ICT,LQ)
1455           GOTO 14
1456         ENDIF
1457 **************************************************
1458 cxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
1459 c No interaction for projectile nucleon considered
1460         NW=NW-1
1461 12      CONTINUE
1462 
1463 c One more projectile spectator (noninteracting) nucleon (spectator positions
1464 c are recorded to simulate nuclear fragmentation)
1465         NS=NS+1
1466         IF(NS.NE.IN)THEN
1467           DO 13 L=1,3
1468 13          XA(NS,L)=XA(IN,L)
1469         ENDIF
1470 14      CONTINUE
1471 
1472 c In case of no one interacting (or D-diffracted) nucleon the event is
1473 c rejected, new impact parameter is generated and all the procedure is
1474 c repeated
1475       IF(NS.EQ.IA(1))THEN
1476         IF(DEBUG.GE.3)WRITE (MONIOU,211)
1477 211     FORMAT(2X,'PSCONF: NO ONE NUCLEON (HADRON) INTERACTS - ',
1478      *  'REJECTION')
1479          GOTO 5
1480       ENDIF
1481 c-------------------------------------------------
1482 cdh   if(nhp.gt.150)then            ! changed 18. Feb. 04
1483       if(nhp.gt.1500)then
1484         WRITE (MONIOU,213)NHP
1485 213     FORMAT(2X,'PSCONF: TOO GREAT NUMBER OF HARD POMERONS: NHP=',
1486      *  I5,' - REJECTION')
1487          GOTO 100
1488       endif
1489 
1490       NWT = 0
1491 C  number of interacting target nucleons
1492       DO 102 IT = 1,NT
1493         NWT = NWT + IWT(IT)
1494  102  CONTINUE
1495 
1496 cxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
1497 c Fragmentation of the spectator part of the nucleus
1498       CALL XXFRAGM(NS,XA)
1499 cxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
1500 
1501 c Inelastic interaction - energy sharing procedure
1502         IF(NW.NE.0)CALL PSSHAR(LS,NHP,NW,NT)
1503 21      continue                     !so00
1504         IF(DEBUG.GE.3)WRITE (MONIOU,212)
1505 212     FORMAT(2X,'PSCONF - END')
1506         RETURN
1507         END
1508 C=======================================================================
1509 
1510        SUBROUTINE QGSPSCS(C,S)
1511 c C,S - COS and SIN generation for uniformly distributed angle 0<fi<2*pi
1512 c-----------------------------------------------------------------------
1513        IMPLICIT DOUBLE PRECISION (A-H,O-Z)
1514         INTEGER DEBUG
1515        COMMON /Q_AREA11/ B10
1516        COMMON /Q_AREA43/ MONIOU
1517        COMMON /Q_DEBUG/  DEBUG
1518        SAVE
1519        EXTERNAL PSRAN
1520 
1521         IF(DEBUG.GE.2)WRITE (MONIOU,201)
1522 201     FORMAT(2X,'QGSPSCS - COS(FI) AND SIN(FI) ARE GENERATED',
1523      *  ' (0<FI<2*PI)')
1524 1      S1=2.D0*PSRAN(B10)-1.D0
1525        S2=2.D0*PSRAN(B10)-1.D0
1526        S3=S1*S1+S2*S2
1527        IF(S3.GT.1.D0)GOTO 1
1528        S3=DSQRT(S3)
1529        C=S1/S3
1530        S=S2/S3
1531         IF(DEBUG.GE.3)WRITE (MONIOU,202)C,S
1532 202     FORMAT(2X,'QGSPSCS: C=',E10.3,2X,'S=',E10.3)
1533        RETURN
1534        END
1535 C=======================================================================
1536 
1537         SUBROUTINE QGSPSDEFTR(S,EP,EY)
1538 c Determination of the parameters for the Lorentz transform to the rest frame
1539 c system for 4-vector EP
1540 c-----------------------------------------------------------------------
1541         IMPLICIT DOUBLE PRECISION (A-H,O-Z)
1542         INTEGER DEBUG
1543         DIMENSION EY(3),EP(4)
1544         COMMON /Q_AREA43/ MONIOU
1545         COMMON /Q_DEBUG/  DEBUG
1546         SAVE
1547 
1548         IF(DEBUG.GE.2)WRITE (MONIOU,201)EP,S
1549 201     FORMAT(2X,'QGSPSDEFTR - LORENTZ BOOST PARAMETERS:'/
1550      *  4X,'4-VECTOR EP=',4E10.3/4X,'4-VECTOR SQUARED S=',E10.3)
1551         DO 2 I=1,3
1552         IF(EP(I+1).EQ.0.D0)THEN
1553           EY(I)=1.D0
1554         ELSE
1555             WP=EP(1)+EP(I+1)
1556           WM=EP(1)-EP(I+1)
1557           IF(WM/WP.LT.1.D-8)THEN
1558             WW=S
1559             DO 1 L=1,3
1560 1            IF(L.NE.I)WW=WW+EP(L+1)**2
1561             WM=WW/WP
1562           ENDIF
1563           EY(I)=DSQRT(WM/WP)
1564           EP(1)=WP*EY(I)
1565           EP(I+1)=0.D0
1566         ENDIF
1567 2       CONTINUE
1568         IF(DEBUG.GE.3)WRITE (MONIOU,202)EY
1569 202     FORMAT(2X,'QGSPSDEFTR: LORENTZ BOOST PARAMETERS EY(I)=',2X
1570      *  ,3E10.3)
1571         RETURN
1572         END
1573 C=======================================================================
1574 
1575         SUBROUTINE QGSPSDEFROT(EP,S0X,C0X,S0,C0)
1576 c Determination of the parameters the spacial rotation to the lab. system
1577 c for 4-vector EP
1578 c-----------------------------------------------------------------------
1579         IMPLICIT DOUBLE PRECISION (A-H,O-Z)
1580         INTEGER DEBUG
1581         DIMENSION EP(4)
1582         COMMON /Q_AREA43/ MONIOU
1583         COMMON /Q_DEBUG/  DEBUG
1584         SAVE
1585 
1586         IF(DEBUG.GE.2)WRITE (MONIOU,201)EP
1587 201     FORMAT(2X,'QGSPSDEFROT - SPACIAL ROTATION PARAMETERS'/4X,
1588      *  '4-VECTOR EP=',2X,4(E10.3,1X))
1589 c Transverse momentum square for the current parton (EP)
1590         PT2=EP(3)**2+EP(4)**2
1591         IF(PT2.NE.0.D0)THEN
1592           PT=DSQRT(PT2)
1593 c System rotation to get Pt=0 - Euler angles are determined (C0X = cos theta,
1594 c S0X = sin theta, C0 = cos phi, S0 = sin phi)
1595           C0X=EP(3)/PT
1596           S0X=EP(4)/PT
1597 c Total momentum for the gluon
1598           PL=DSQRT(PT2+EP(2)**2)
1599           S0=PT/PL
1600           C0=EP(2)/PL
1601         ELSE
1602           C0X=1.D0
1603           S0X=0.D0
1604           PL=ABS(EP(2))
1605           S0=0.D0
1606           C0=EP(2)/PL
1607         ENDIF
1608 
1609         EP(2)=PL
1610         EP(3)=0.D0
1611         EP(4)=0.D0
1612         IF(DEBUG.GE.3)WRITE (MONIOU,202)S0X,C0X,S0,C0,EP
1613 202     FORMAT(2X,'QGSPSDEFROT: SPACIAL ROTATION PARAMETERS'/
1614      *  4X,'S0X=',E10.3,2X,'C0X=',E10.3,2X,'S0=',E10.3,2X,'C0=',E10.3/
1615      *  4X,'ROTATED 4-VECTOR EP=',4(E10.3,1X))
1616         RETURN
1617         END
1618 C=======================================================================
1619 
1620         FUNCTION PSDR(X,Y)
1621 c PSDR - impact parameter factor for eikonals calculation (exp(-Rij/Rp)=Z)
1622 c-----------------------------------------------------------------------
1623         IMPLICIT DOUBLE PRECISION (A-H,O-Z)
1624         INTEGER DEBUG
1625         COMMON /Q_AREA7/  RP
1626         COMMON /Q_AREA43/ MONIOU
1627         COMMON /Q_DEBUG/  DEBUG
1628         SAVE
1629 
1630         IF(DEBUG.GE.2)WRITE (MONIOU,201)X,Y
1631 201     FORMAT(2X,'PSDR: NUCLEON COORDINATES - X=',E10.3,2X,'Y=',E10.3)
1632         PSDR=EXP(-(X*X+Y*Y)/RP)
1633         IF(DEBUG.GE.3)WRITE (MONIOU,202)PSDR
1634 202     FORMAT(2X,'PSDR=',E10.3)
1635         RETURN
1636         END
1637 C=======================================================================
1638 
1639         FUNCTION QGSPSFAP(X,J,L)
1640 C QGSPSFAP - Altarelli-Parisi function (multiplied by X)
1641 c X - light cone momentum share value,
1642 c J - type of the parent parton (0-g,1-q)
1643 c L - type of the daughter parton (0-g,1-q)
1644 C-----------------------------------------------------------------------
1645         IMPLICIT DOUBLE PRECISION (A-H,O-Z)
1646         INTEGER DEBUG
1647         COMMON /Q_AREA43/ MONIOU
1648         COMMON /Q_DEBUG/  DEBUG
1649         SAVE
1650 
1651         IF(DEBUG.GE.2)WRITE (MONIOU,201)X,J,L
1652 201     FORMAT(2X,'QGSPSFAP - ALTARELLI-PARISI FUNCTION:',2X,
1653      *  'X=',E10.3,2X,'J=',I1,2X,'L=',I1)
1654         IF(J.EQ.0)THEN
1655           IF(L.EQ.0)THEN
1656             QGSPSFAP=((1.D0-X)/X+X/(1.D0-X)+X*(1.D0-X))*6.d0
1657           ELSE
1658             QGSPSFAP=(X**2+(1.D0-X)**2)*3.d0
1659           ENDIF
1660         ELSE
1661           IF(l.EQ.0)THEN
1662             QGSPSFAP=(1.D0+(1.D0-X)**2)/X/.75D0
1663           ELSE
1664             QGSPSFAP=(X**2+1.D0)/(1.D0-X)/.75D0
1665           ENDIF
1666         ENDIF
1667         IF(DEBUG.GE.3)WRITE (MONIOU,202)QGSPSFAP
1668 202     FORMAT(2X,'QGSPSFAP=',E10.3)
1669         RETURN
1670         END
1671 C=======================================================================
1672 
1673         FUNCTION PSFAZ(Z,FSOFT,FHARD,FSHARD)
1674 c Interaction eikonal for hadron-nucleon (nucleon-nucleon) scattering
1675 c Z - impact parameter factor, Z=exp(-b**2/Rp),
1676 c FSOFT - soft pomeron eikonal - to be determined,
1677 c FSHARD - semihard interaction eikonal (gg) - to be determined,
1678 c FHARD(k) - hard interaction eikonal (k=1 - qg, 2 - gq, 3 - qq) -
1679 c to be determined,
1680 c-----------------------------------------------------------------------
1681         IMPLICIT DOUBLE PRECISION (A-H,O-Z)
1682         INTEGER DEBUG
1683         DIMENSION FHARD(3)
1684         COMMON /Q_AREA17/ DEL,RS,RS0,FS,ALF,RR,SH,DELH
1685         COMMON /Q_AREA22/ SJV,FJS(5,3)
1686         COMMON /Q_AREA43/ MONIOU
1687         COMMON /Q_DEBUG/  DEBUG
1688         SAVE
1689 
1690         IF(DEBUG.GE.2)WRITE (MONIOU,201)Z
1691 201     FORMAT(2X,'PSFAZ - HADRON-NUCLEON (NUCLEON-NUCLEON)',
1692      *  ' INTERACTION EIKONAL; Z=',E10.3)
1693         FSOFT=FS*Z
1694         FHARD(3)=SJV*Z**(RS/RS0)
1695 
1696         JZ=INT(5.D0*Z)
1697         IF(JZ.GT.3)JZ=3
1698         WZ=5.D0*Z-JZ
1699 
1700         DO 1 I=1,3
1701         IF(JZ.EQ.0)THEN
1702           FSR=(EXP(FJS(1,I))*WZ+(EXP(FJS(2,I))-2.D0*
1703      *    EXP(FJS(1,I)))*WZ*(WZ-1.D0)*.5D0)*Z
1704         ELSE
1705           FSR=EXP(FJS(JZ,I)+(FJS(JZ+1,I)-FJS(JZ,I))*WZ
1706      *    +(FJS(JZ+2,I)+FJS(JZ,I)-2.D0*FJS(JZ+1,I))
1707      *    *WZ*(WZ-1.D0)*.5D0)*Z
1708         ENDIF
1709         IF(I.NE.1)THEN
1710           FHARD(I-1)=FSR
1711         ELSE
1712           FSHARD=FSR
1713         ENDIF
1714 1       CONTINUE
1715 
1716         PSFAZ=FSOFT+FSHARD
1717         IF(DEBUG.GE.3)WRITE (MONIOU,202)PSFAZ,FSOFT,FSHARD,FHARD
1718 202     FORMAT(2X,'PSFAZ=',E10.3,2X,'FSOFT=',E10.3,2X,'FSHARD=',E10.3/4X
1719      *    ,'FHARD=',3E10.3)
1720         RETURN
1721         END
1722 C=======================================================================
1723 
1724         FUNCTION PSFBORN(S,T,IQ1,IQ2)
1725 c PSFBORN - integrand for the Born cross-section (matrix element squared)
1726 c S - total c.m. energy squared for the scattering,
1727 c T - invariant variable for the scattering abs[(p1-p3)**2],
1728 c IQ1 - parton type at current end of the ladder (0 - g, 1,2 - q)
1729 c IQ2 - parton type at opposite end of the ladder (0 - g, 1,2 - q)
1730 c-----------------------------------------------------------------------
1731         IMPLICIT DOUBLE PRECISION (A-H,O-Z)
1732         INTEGER DEBUG
1733         COMMON /Q_AREA18/ ALM,QT0,QLOG,QLL,AQT0,QTF,BET,AMJ0
1734         COMMON /Q_AREA43/ MONIOU
1735         COMMON /Q_DEBUG/  DEBUG
1736         SAVE
1737 
1738         IF(DEBUG.GE.2)WRITE (MONIOU,201)S,T,IQ1,IQ2
1739 201     FORMAT(2X,'PSFBORN - HARD SCATTERING MATRIX ELEMENT SQUARED:'/
1740      *  4X,'S=',E10.3,2X,'|T|=',E10.3,2X,'IQ1=',I2,2X,'IQ2=',I2)
1741         U=S-T
1742         IF(IQ1.EQ.0.AND.IQ2.EQ.0)THEN
1743 c Gluon-gluon
1744           PSFBORN=(3.D0-T*U/S**2+S*U/T**2+S*T/U**2)*4.5D0
1745         ELSEIF(IQ1*IQ2.EQ.0)THEN
1746 c Gluon-quark
1747           PSFBORN=(S**2+U**2)/T**2+(S/U+U/S)/2.25D0
1748         ELSEIF(IQ1.EQ.IQ2)THEN
1749 c Quark-quark (of the same flavor)
1750           PSFBORN=((S**2+U**2)/T**2+(S**2+T**2)/U**2)/2.25D0
1751      *          -S**2/T/U/3.375D0
1752         ELSEIF(IQ1+IQ2.EQ.0)THEN
1753 c Quark-antiquark (of the same flavor)
1754           PSFBORN=((S**2+U**2)/T**2+(U**2+T**2)/S**2)/2.25D0
1755      *          -U**2/T/S/3.375D0
1756         ELSE
1757 c Quark-quark (different flavors)
1758           PSFBORN=(S**2+U**2)/T**2/2.25D0
1759         ENDIF
1760         IF(DEBUG.GE.2)WRITE (MONIOU,202)PSFBORN
1761 202     FORMAT(2X,'PSFBORN=',E10.3)
1762         RETURN
1763         END
1764 C=======================================================================
1765 
1766         FUNCTION QGSPSFSH(S,Z,ICZ,IQQ)
1767 c QGSPSFSH - semihard interaction eikonal
1768 c S - energy squared for the interaction (hadron-hadron),
1769 c ICZ - type of the primaty hadron (nucleon)
1770 c Z - impact parameter factor, Z=exp(-b**2/Rp),
1771 c IQQ - type of the hard interaction (0 - gg, 1 - qg, 2 - gq)
1772 c-----------------------------------------------------------------------
1773         IMPLICIT DOUBLE PRECISION (A-H,O-Z)
1774         INTEGER DEBUG
1775         COMMON /Q_AREA6/  PI,BM,AM
1776         COMMON /Q_AREA15/ FP(5),RQ(5),CD(5)
1777         COMMON /Q_AREA17/ DEL,RS,RS0,FS,ALF,RR,SH,DELH
1778         COMMON /Q_AREA18/ ALM,QT0,QLOG,QLL,AQT0,QTF,BET,AMJ0
1779         COMMON /Q_AREA19/ AHL(5)
1780         COMMON /Q_AREA25/ AHV(5)
1781         COMMON /Q_AREA27/ FP0(5)
1782         COMMON /Q_AR13/    X1(7),A1(7)
1783         COMMON /Q_AREA43/ MONIOU
1784         COMMON /Q_DEBUG/  DEBUG
1785         SAVE
1786 
1787         IF(DEBUG.GE.2)WRITE (MONIOU,201)S,Z,IQQ,ICZ
1788 201     FORMAT(2X,'QGSPSFSH - SEMIHARD INTERACTION EIKONAL:'/
1789      *  4X,'S=',E10.3,2X,'Z=',E10.3,2X,'IQQ=',I1,2X,'ICZ=',I1)
1790         XMIN=4.D0*QT0/S
1791         XMIN=XMIN**(DELH-DEL)
1792         QGSPSFSH=0.D0
1793         IF(IQQ.EQ.1)THEN
1794           ICV=ICZ
1795           ICQ=2
1796         ELSEIF(IQQ.EQ.2)THEN
1797           ICV=2
1798           ICQ=ICZ
1799         ENDIF
1800         IQ=(IQQ+1)/2
1801 
1802 c Numerical integration over Z1
1803         DO 3 I=1,7
1804         DO 3 M=1,2
1805         Z1=(.5D0*(1.D0+XMIN-(2*M-3)*X1(I)*(1.D0-XMIN)))**(1.D0/
1806      *  (DELH-DEL))
1807 c SJ is the DLA inclusive hard partonic (gluon-gluon) interaction
1808 c cross-section (inclusive cut ladder cross section) for minimal
1809 c 4-momentum transfer squre QT0 and c.m. energy square s_hard = exp YJ;
1810 c SJB - Born cross-section
1811         CALL PSJINT0(Z1*S,SJ,SJB,IQ,0)
1812 c GY= Sigma_hard_tot(YJ,QT0) - total hard partonic (gluon-gluon)
1813 c interaction cross-section for minimal 4-momentum transfer square QT0 and
1814 c c.m. energy square s_hard = exp YJ; SH=pi*R_hard**2 (R_hard**2=4/QT0)
1815         GY=2.D0*SH*PSGINT((SJ-SJB)/SH*.5D0)+SJB
1816         IF(DEBUG.GE.3)WRITE (MONIOU,203)Z1*S,GY
1817 203     FORMAT(2X,'QGSPSFSH:',2X,'S_HARD=',E10.3,2X,'SIGMA_HARD=',E10.3)
1818 
1819         IF(IQQ.EQ.0)THEN
1820           ST2=0.D0
1821           DO 1 J=1,7
1822           DO 1 K=1,2
1823           XX=.5D0*(1.D0+X1(J)*(2*K-3))
1824 1         ST2=ST2+A1(J)*QGSPSFTILD(Z1**XX,ICZ)*
1825      *    QGSPSFTILD(Z1**(1.D0-XX),2)
1826 
1827           RH=RS0-ALF*DLOG(Z1)
1828           QGSPSFSH=QGSPSFSH-A1(I)*DLOG(Z1)*GY/Z1**DELH*Z**(RS/RH)/RH*ST2
1829         ELSE
1830 
1831           ST2=0.D0
1832           DO 2 J=1,7
1833           DO 2 K=1,2
1834           XX=.5D0*(1.D0+X1(J)*(2*K-3))
1835           XAM=Z1**(DEL+.5D0)
1836           XA=(XAM+(1.D0-XAM)*XX)**(1.D0/(DEL+.5D0))
1837           RH=RS0+ALF*DLOG(XA/Z1)
1838 2         ST2=ST2+A1(J)*(1.D0-XA)**AHV(ICV)*Z**(RS/RH)/RH*
1839      *    QGSPSFTILD(Z1/XA,ICQ)
1840           ST2=ST2*(1.D0-XAM)
1841 
1842           QGSPSFSH=QGSPSFSH+A1(I)*GY/Z1**DELH*ST2
1843         ENDIF
1844 3       CONTINUE
1845 
1846         IF(IQQ.EQ.0)THEN
1847           QGSPSFSH=QGSPSFSH*.125D0*RR*(1.D0-XMIN)/(DELH-DEL)*FP0(ICZ)
1848      *                     *FP0(2)
1849      *    *CD(ICZ)
1850         ELSE
1851           QGSPSFSH=QGSPSFSH*DSQRT(RR)/16.D0*FP0(ICQ)*(1.D0-XMIN)
1852      *    /(DELH-DEL)/(DEL+.5D0)*GAMFUN(AHV(ICV)+1.5D0)
1853      *    /GAMFUN(AHV(ICV)+1.D0)/PI*CD(ICZ)
1854           IF(ICZ.EQ.2.OR.IQQ.EQ.2)THEN
1855             QGSPSFSH=QGSPSFSH*3.D0
1856           ELSEIF((ICZ-1)*(ICZ-3)*(ICZ-5).EQ.0)THEN
1857             QGSPSFSH=QGSPSFSH*2.D0
1858           ENDIF
1859         ENDIF
1860         IF(DEBUG.GE.3)WRITE (MONIOU,202)QGSPSFSH
1861 202     FORMAT(2X,'QGSPSFSH=',E10.3)
1862         RETURN
1863         END
1864 C=======================================================================
1865 
1866         FUNCTION QGSPSFTILD(Z,ICZ)
1867 c QGSPSFTILD - auxilliary function for semihard eikonals calculation -
1868 c integration over semihard block light cone momentum share x
1869 c Z - x-cutoff from below,
1870 c ICZ - type of the hadron to which the semihard block is connected
1871 c-----------------------------------------------------------------------
1872         IMPLICIT DOUBLE PRECISION (A-H,O-Z)
1873         INTEGER DEBUG
1874         COMMON /Q_AREA17/ DEL,RS,RS0,FS,ALFP,RR,SH,DELH
1875         COMMON /Q_AREA18/ ALM,QT0,QLOG,QLL,AQT0,QTF,BET,AMJ0
1876         COMMON /Q_AREA19/ AHL(5)
1877         COMMON /Q_AR13/  X1(7),A1(7)
1878         COMMON /Q_AREA43/ MONIOU
1879         COMMON /Q_DEBUG/  DEBUG
1880         SAVE
1881 
1882         IF(DEBUG.GE.2)WRITE (MONIOU,201)Z,ICZ
1883 201     FORMAT(2X,'QGSPSFTILD:',2X,'Z=',E10.3,2X,'ICZ=',I1)
1884         QGSPSFTILD=0.
1885         DO 1 I=1,7
1886         DO 1 M=1,2
1887         XB=1.D0-(1.D0-Z)*(.5D0*(1.D0+(2*M-3)*X1(I)))**(1.D0/
1888      *  (AHL(ICZ)+1.D0))
1889 1       QGSPSFTILD=QGSPSFTILD+A1(I)*XB**DEL*(1.D0-Z/XB)**BET
1890         QGSPSFTILD=QGSPSFTILD*.5D0*(1.D0-Z)**(AHL(ICZ)+1.D0)
1891      *             /(AHL(ICZ)+1.D0)
1892         IF(DEBUG.GE.3)WRITE (MONIOU,202)QGSPSFTILD
1893 202     FORMAT(2X,'QGSPSFTILD=',E10.3)
1894         RETURN
1895         END
1896 C=======================================================================
1897 
1898       SUBROUTINE PSGEA(IA,XA,JJ)
1899 c PSGEA - nuclear configuration simulation (nucleons positions)
1900 c IA - number of nucleons to be considered
1901 c-----------------------------------------------------------------------
1902       IMPLICIT DOUBLE PRECISION (A-H,O-Z)
1903       INTEGER DEBUG
1904 cdh   DIMENSION XA(56,3)
1905       DIMENSION XA(210,3)
1906       COMMON /Q_AREA5/  RD(2),CA1(2),CA2(2),CA3(2)
1907       COMMON /Q_AREA11/ B10
1908       COMMON /Q_AREA43/ MONIOU
1909       COMMON /Q_DEBUG/  DEBUG
1910       SAVE
1911       EXTERNAL PSRAN
1912 
1913         IF(DEBUG.GE.2)WRITE (MONIOU,201)JJ,IA
1914 201     FORMAT(2X,'PSGEA - CONFIGURATION OF THE NUCLEUS ',I1,';',2X,
1915      *  'COORDINATES FOR ',I2,' NUCLEONS')
1916 cdh     IF(JJ.EQ.2.OR.IA.GE.10)THEN
1917         IF(IA.GE.10)THEN !this line had been changed!!!!!!! dh 8/10/98
1918 cdh
1919           DO 7 I=1,IA
1920 1         ZUK=PSRAN(B10)*CA1(JJ)-1.D0
1921           IF(ZUK)2,2,3
1922 2         TT=RD(JJ)*(PSRAN(B10)**.3333D0-1.D0)
1923           GOTO 6
1924 3         IF(ZUK.GT.CA2(JJ))GOTO 4
1925           TT=-DLOG(PSRAN(B10))
1926           GOTO 6
1927 4         IF(ZUK.GT.CA3(JJ))GOTO 5
1928           TT=-DLOG(PSRAN(B10))-DLOG(PSRAN(B10))
1929           GOTO 6
1930 5         TT=-DLOG(PSRAN(B10))-DLOG(PSRAN(B10))-DLOG(PSRAN(B10))
1931 6         IF(PSRAN(B10).GT.1.D0/(1.D0+EXP(-ABS(TT))))GOTO 1
1932           RIM=TT+RD(JJ)
1933           Z=RIM*(2.D0*PSRAN(B10)-1.D0)
1934           RIM=DSQRT(RIM*RIM-Z*Z)
1935           XA(I,3)=Z
1936           CALL QGSPSCS(C,S)
1937           XA(I,1)=RIM*C
1938 7         XA(I,2)=RIM*S
1939         ELSE
1940 
1941           DO 9 L=1,3
1942           SUMM=0.D0
1943           DO 8 I=1,IA-1
1944           J=IA-I
1945           AKS=RD(JJ)*(PSRAN(B10)+PSRAN(B10)+PSRAN(B10)-1.5D0)
1946           K=J+1
1947           XA(K,L)=SUMM-AKS*SQRT(FLOAT(J)/K)
1948 8         SUMM=SUMM+AKS/SQRT(FLOAT(J*K))
1949 9         XA(1,L)=SUMM
1950         ENDIF
1951         IF(DEBUG.GE.3)THEN
1952           WRITE (MONIOU,203)
1953           DO 206 I=1,IA
1954 206       WRITE (MONIOU,204)I,(XA(I,L),L=1,3)
1955           WRITE (MONIOU,202)
1956         ENDIF
1957 202     FORMAT(2X,'PSGEA - END')
1958 203     FORMAT(2X,'PSGEA:  POSITIONS OF THE NUCLEONS')
1959 204     FORMAT(2X,'PSGEA: ',I2,' - ',3(E10.3,1X))
1960         RETURN
1961         END
1962 C=======================================================================
1963 
1964         FUNCTION PSGINT(Z)
1965 c Auxiliary function for eikonal cross-sections calculation
1966 c GINT = int(dt) [0<t<Z] (1-exp(-t))/t
1967 c-----------------------------------------------------------------------
1968       IMPLICIT DOUBLE PRECISION (A-H,O-Z)
1969       INTEGER DEBUG
1970       COMMON /Q_AR13/  X1(7),A1(7)
1971       COMMON /Q_AREA43/ MONIOU
1972       COMMON /Q_DEBUG/  DEBUG
1973       SAVE
1974 
1975         F(Z,X)=(1.-EXP(-.5*Z*(1.+X)))/(1.+X)
1976 
1977         IF(DEBUG.GE.2)WRITE (MONIOU,201)Z
1978 201     FORMAT(2X,'PSGINT:',2X,'Z=',E10.3)
1979         PSGINT=0.
1980         DO 5 I=1,7
1981 5       PSGINT=PSGINT+A1(I)*(F(Z,X1(I))+F(Z,-X1(I)))
1982         IF(DEBUG.GE.3)WRITE (MONIOU,202)PSGINT
1983 202     FORMAT(2X,'PSGINT=',E10.3)
1984         RETURN
1985         END
1986 C=======================================================================
1987 
1988         FUNCTION QGSPSHARD(S,ICZ)
1989 c QGSPSHARD - hard quark-quark interaction cross-section
1990 c S - energy squared for the interaction (hadron-hadron),
1991 c ICZ - type of the primaty hadron (nucleon)
1992 c-----------------------------------------------------------------------
1993         IMPLICIT DOUBLE PRECISION (A-H,O-Z)
1994         INTEGER DEBUG
1995         COMMON /Q_AR13/    X1(7),A1(7)
1996         COMMON /Q_AREA6/  PI,BM,AM
1997         COMMON /Q_AREA15/ FP(5),RQ(5),CD(5)
1998         COMMON /Q_AREA17/ DEL,RS,RS0,FS,ALF,RR,SH,DELH
1999         COMMON /Q_AREA18/ ALM,QT0,QLOG,QLL,AQT0,QTF,BET,AMJ0
2000         COMMON /Q_AREA19/ AHL(5)
2001         COMMON /Q_AREA25/ AHV(5)
2002         COMMON /Q_AREA43/ MONIOU
2003         COMMON /Q_DEBUG/  DEBUG
2004         SAVE
2005 
2006         IF(DEBUG.GE.2)WRITE (MONIOU,201)S,ICZ
2007 201     FORMAT(2X,'QGSPSHARD - HARD QUARK-QUARK INTERACTION CROSS',
2008      *  ' SECTION:',
2009      *  2X,'S=',E10.3,2X,'ICZ=',I1)
2010         XMIN=4.D0*QT0/S
2011         XMIN=XMIN**(DELH+.5D0)
2012         QGSPSHARD=0.D0
2013 
2014 c Numerical integration over Z1
2015         DO 2 I=1,7
2016         DO 2 M=1,2
2017         Z1=(.5D0*(1.D0+XMIN-(2*M-3)*X1(I)*(1.D0-XMIN)))**(1.D0/
2018      *  (DELH+.5D0))
2019 
2020         ST2=0.D0
2021         DO 1 J=1,7
2022         DO 1 K=1,2
2023         XX=.5D0*(1.D0+X1(J)*(2*K-3))
2024         ST2=ST2+A1(J)*(1.D0-Z1**XX)**AHV(ICZ)*
2025      *  (1.D0-Z1**(1.D0-XX))**AHV(2)
2026 1       CONTINUE
2027 
2028 c SJ is the DLA inclusive hard partonic (gluon-gluon) interaction
2029 c cross-section (inclusive cut ladder cross section) for minimal
2030 c 4-momentum transfer squre QT0 and c.m. energy square s_hard = exp YJ;
2031 c SJB - Born cross-section
2032         CALL PSJINT0(Z1*S,SJ,SJB,1,1)
2033 c GY= Sigma_hard_tot(YJ,QT0) - total hard partonic (quark-quark)
2034 c interaction cross-section for minimal 4-momentum transfer square QT0 and
2035 c c.m. energy square s_hard = exp YJ; SH=pi*R_hard**2 (R_hard**2=4/QT0)
2036         GY=2.D0*SH*PSGINT((SJ-SJB)/SH*.5D0)+SJB
2037 
2038         IF(DEBUG.GE.3)WRITE (MONIOU,203)Z1*S,GY
2039 203    FORMAT(2X,'QGSPSHARD:',2X,'S_HARD=',E10.3,2X,'SIGMA_HARD=',E10.3)
2040         QGSPSHARD=QGSPSHARD-A1(I)*DLOG(Z1)*GY/Z1**DELH*ST2
2041 2       CONTINUE
2042 
2043         QGSPSHARD=QGSPSHARD*(1.D0-XMIN)/(.5D0+DELH)*.25D0
2044         QGSPSHARD=QGSPSHARD/(GAMFUN(AHV(ICZ)+1.D0)*GAMFUN(AHV(2)+1.D0)
2045      *  *PI)*GAMFUN(AHV(ICZ)+1.5D0)*GAMFUN(AHV(2)+1.5D0)
2046 
2047         IF(ICZ.EQ.2)THEN
2048           QGSPSHARD=QGSPSHARD*9.D0
2049         ELSEIF((ICZ-1)*(ICZ-3)*(ICZ-5).EQ.0)THEN
2050           QGSPSHARD=QGSPSHARD*6.D0
2051         ELSE
2052           QGSPSHARD=QGSPSHARD*3.D0
2053         ENDIF
2054 
2055 c Hard cross-section is divided by Regge radius RS0 and multiplied by
2056 c shower enhancement coefficient CD(ICZ) - to be used for the eikonal
2057 c calculation
2058         QGSPSHARD=QGSPSHARD/(8.D0*PI*RS0)*CD(ICZ)
2059         IF(DEBUG.GE.2)WRITE (MONIOU,202)QGSPSHARD
2060 202     FORMAT(2X,'QGSPSHARD=',E10.3)
2061         RETURN
2062         END
2063 C=======================================================================
2064 
2065         SUBROUTINE PSHOT(WP0,WM0,Z,IPC,EPC,IZP,IZT,ICZ,IQQ)
2066 c Semihard jets production simulation (resulted from parton-parton
2067 c interaction);
2068 c WP0,WM0 - light cone momenta shares (E+-P_l) for the initial partons
2069 c IZP, IZT - types for target and projectile nucleons (hadron)
2070 c WPQ - light cone momenta for the soft preevolution - to be determined below
2071 c IQQ - type of the hard interaction: 0 - gg, 1 - qg, 2 - gq, 3 - qq
2072 c-----------------------------------------------------------------------
2073         IMPLICIT DOUBLE PRECISION (A-H,O-Z)
2074         INTEGER DEBUG
2075         CHARACTER*2 TYQ
2076         DIMENSION EPT(4),EP3(4),EPJ(4),EPJ1(4),EY(3),
2077      *  QMIN(2),WP(2),IQC(2),IQP(2),
2078      *  IPC(2,2),EPC(8,2),IQJ(2),EQJ(4,2),IPQ(2,2),EPQ(8,2),
2079      *  ebal(4),
2080      *  QV1(30,50),ZV1(30,50),QM1(30,50),IQV1(30,50),
2081      *  LDAU1(30,49),LPAR1(30,50),
2082      *  QV2(30,50),ZV2(30,50),QM2(30,50),IQV2(30,50),
2083      *  LDAU2(30,49),LPAR2(30,50)!,EP(4,2),EPT0(4)
2084         COMMON /Q_AREA6/  PI,BM,AMMM
2085         COMMON /Q_AREA8/  WWM,BE(4),DC(5),DETA,ALMPT
2086         COMMON /Q_AREA10/ STMASS,AM(7)
2087         COMMON /Q_AREA11/ B10
2088         COMMON /Q_AREA17/ DEL,RS,RS0,FS,ALF,RR,SH,DELH
2089         COMMON /Q_AREA18/ ALM,QT0,QLOG,QLL,AQT0,QTF,BET,AMJ0
2090         COMMON /Q_AREA42/ TYQ(15)
2091         COMMON /Q_AREA43/ MONIOU
2092         COMMON /Q_AREA46/ EPJET(4,2,15000),IPJET(2,15000)
2093         COMMON /Q_AREA47/ NJTOT
2094         COMMON /Q_DEBUG/  DEBUG
2095         SAVE
2096         EXTERNAL PSRAN
2097 
2098         IF(DEBUG.GE.1)WRITE (MONIOU,201)IQQ,WP0,WM0
2099 201     FORMAT(2X,'PSHOT - SEMIHARD INTERACTION SIMULATION:'/
2100      *  4X,'TYPE OF THE INTERACTION:',I2/
2101      *  4X,'INITIAL LIGHT CONE MOMENTA:',2E10.3)
2102 c S - total energy squared for the semihard interaction (including preevolution)
2103         NJTOT0=NJTOT
2104         IZP0=IZP
2105         IZT0=IZT
2106 
2107 301     S=WP0*WM0
2108         NJTOT=NJTOT0
2109         IZP=IZP0
2110         IZT=IZT0
2111 
2112         IF(IQQ.EQ.3)THEN
2113 c WPI,WMI - light cone momenta for the hard interaction
2114           WPI=WP0
2115           WMI=WM0
2116 c PSJINT0(S,SJ,SJB,1,1) - cross-sections interpolation:
2117 c SJ - inclusive hard quark-quark interaction
2118 c cross-section (inclusive cut ladder cross section) for minimal
2119 c 4-momentum transfer square QT0 and c.m. energy square s_hard = S;
2120 c SJB - Born cross-section
2121           CALL PSJINT0(S,SJ,SJB,1,1)
2122 c GY= Sigma_hard_tot(YJ,QT0) - total hard quark-quark
2123 c interaction cross-section for minimal 4-momentum transfer square QT0 and
2124 c c.m. energy square s_hard = S
2125           GY=2.D0*SH*PSGINT((SJ-SJB)/SH*.5D0)+SJB
2126 
2127         ELSE
2128 c-------------------------------------------------
2129 c Rejection function normalization
2130 c-------------------------------------------------
2131 c XMIN corresponds to minimal energy squared for the hard interaction - 4.D0*(QT0+AMJ0)
2132 c AMJ0 - jet mass squared (could be put equal zero)
2133           XMIN=4.D0*(QT0+AMJ0)/S
2134           XMIN1=XMIN**(DELH-DEL)
2135 c S - maximal available energy for the rejection function normalization
2136 c Auxilliary type of parton (1 - gluon, 2 - (anti-)quark)
2137           IQ=(IQQ+1)/2
2138 c Rejection function initialization (corresponding to maximal preevolution - minimal x):
2139 c Ysoft = - ln x, (1-x)**bet is due to gluon structure function in the soft pomeron
2140           IF(IQQ.EQ.0)THEN
2141              GB0=-DLOG(XMIN)*(1.D0-DSQRT(XMIN))**(2.D0*BET)
2142           ELSE
2143              GB0=(1.D0-XMIN)**BET
2144           ENDIF
2145 
2146 c SJ0 is the inclusive hard (parton IQ - gluon) interaction
2147 c cross-section (inclusive cut ladder cross section) for minimal
2148 c 4-momentum transfer square QT0 and c.m. energy square s_hard = SI;
2149 c SJB0 - Born cross-section
2150           CALL PSJINT0(S,SJ,SJB,IQ,0)
2151 c GY= Sigma_hard_tot(YJ,QT0) - total hard  (parton IQ - gluon)
2152 c interaction cross-section for minimal 4-momentum transfer square QT0 and
2153 c c.m. energy square s_hard = SI
2154           GY0=2.D0*SH*PSGINT((SJ-SJB)/SH*.5D0)+SJB
2155           GB0=GB0*GY0/S**DELH/RS0*Z
2156 c-------------------------------------------------
2157 c End of rejection function normalization
2158 c-------------------------------------------------
2159 
2160 c-------------------------------------------------
2161 c The sharing of the light cone momenta between soft preevolution and
2162 c hard interaction:
2163 c ( first energy-momentum is shared according to
2164 c f_hard(YJ)~ZPM**(DELH-DEL-1) and then rejected as
2165 c W_rej ~Sigma_hard_tot(YJ) / exp(DELH*YJ)
2166 c ZPM = s_hard / S
2167 c YJ = ln s_hard - rapidity range for the hard parton-parton interaction;
2168 c-------------------------------------------------
2169 1         ZPM=(XMIN1+PSRAN(B10)*(1.D0-XMIN1))**(1.D0/(DELH-DEL))
2170 c SJ is the DLA inclusive hard partonic (gluon-gluon) interaction
2171 c cross-section (inclusive cut ladder cross section) for minimal
2172 c 4-momentum transfer square QT0 and c.m. energy square s_hard = exp YJ;
2173 c SJB - Born cross-section
2174           CALL PSJINT0(ZPM*S,SJ,SJB,IQ,0)
2175           YJ=DLOG(ZPM*S)
2176 c RH - interaction radius due to soft preevolution
2177           RH=RS0-ALF*DLOG(ZPM)
2178 
2179           IF(IQQ.EQ.0)THEN
2180 c XP, XM - light cone momunta shares for the hard interaction
2181             XP=ZPM**PSRAN(B10)
2182             XM=ZPM/XP
2183 c Ysoft = - ln ZPM - part of rejection function,
2184 c (1-XP)**bet*(1-XM)**bet is due to gluon structure function in the soft pomeron
2185             GBYJ=-DLOG(ZPM)*((1.-XP)*(1.-XM))**BET
2186 c WPI,WMI - light cone momenta for the hard interaction
2187             WPI=WP0*XP
2188             WMI=WM0*XM
2189           ELSE
2190             IF(IQQ.EQ.1)THEN
2191               WPI=WP0
2192               WMI=WM0*ZPM
2193             ELSE
2194               WPI=WP0*ZPM
2195               WMI=WM0
2196             ENDIF
2197             GBYJ=(1.D0-ZPM)**BET
2198           ENDIF
2199 
2200 c GY= Sigma_hard_tot(YJ,QT0) - total hard partonic
2201 c interaction cross-section for minimal 4-momentum transfer square QT0 and
2202 c c.m. energy square s_hard = exp YJ
2203           GY=2.D0*SH*PSGINT((SJ-SJB)/SH*.5D0)+SJB
2204 
2205 c-------------------------------------------------
2206 c GBYJ - rejection function for the YJ (ZPM) simulation:
2207 c GBYJ ~  Sigma_hard_tot(YJ,QT0) / exp(DELH*YJ) * exp(-b**2/RH) / RH,
2208           GBYJ=GBYJ*GY*EXP(-DELH*YJ)/GB0*Z**(RS/RH)/RH
2209           IF(PSRAN(B10).GT.GBYJ)GOTO 1
2210         ENDIF
2211 c-------------------------------------------------
2212         S=WPI*WMI
2213 
2214         IF(DEBUG.GE.2)WRITE (MONIOU,203)S
2215 203     FORMAT(2X,'PSHOT: MASS SQUARED FOR THE HARD PARTON-PARTON',
2216      *  ' INTERACTION:',E10.3)
2217 
2218 c In case of valence quark hard interaction the type of quark is determined by the
2219 c procedure PSVDEF - flavor combinatorics (not good here); IQC(1) - flavor
2220 c for the upper quark (0 in case of gluon),
2221 c IQC(2) - the same for the lower one
2222         DO 302 I=1,8
2223         DO 302 M=1,2
2224 302     EPC(I,M)=0.D0
2225 
2226         IF((IQQ-1)*(IQQ-3).EQ.0)THEN
2227           CALL PSVDEF(IZP,IC1,ICZ)
2228           IQC(1)=IC1
2229           IPC(1,1)=0
2230           IPC(2,1)=0
2231         ELSE
2232           IQC(1)=0
2233           IPC(1,1)=-INT(2.D0*PSRAN(B10)+1.D0)
2234           IPC(2,1)=-IPC(1,1)
2235           WP1=WP0-WPI
2236           WP2=WP1*PSRAN(B10)
2237           WP1=WP1-WP2
2238           EPC(1,1)=.5D0*WP1
2239           EPC(2,1)=EPC(1,1)
2240           EPC(5,1)=.5D0*WP2
2241           EPC(6,1)=EPC(5,1)
2242                ENDIF
2243 
2244         IF((IQQ-2)*(IQQ-3).EQ.0)THEN
2245           CALL PSVDEF(IZT,IC1,2)
2246           IQC(2)=IC1
2247           IPC(1,2)=0
2248           IPC(2,2)=0
2249         ELSE
2250           IQC(2)=0
2251           IPC(1,2)=-INT(2.D0*PSRAN(B10)+1.D0)
2252           IPC(2,2)=-IPC(1,2)
2253           WM1=WM0-WMI
2254           WM2=WM1*PSRAN(B10)
2255           WM1=WM1-WM2
2256           EPC(1,2)=.5D0*WM1
2257           EPC(2,2)=-EPC(1,2)
2258           EPC(5,2)=.5D0*WM2
2259           EPC(6,2)=-EPC(5,2)
2260         ENDIF
2261 
2262         EPT(1)=.5D0*(WPI+WMI)
2263         EPT(2)=.5D0*(WPI-WMI)
2264         EPT(3)=0.D0
2265         EPT(4)=0.D0
2266 c Minimal 4-momentum transfer squares above and below current ladder run
2267         QMIN(1)=QT0
2268         QMIN(2)=QT0
2269         DO 303 L=1,2
2270         DO 303 M=1,2
2271               IPQ(L,M)=IPC(L,M)
2272         DO 303 I=1,4
2273 303     EPQ(I+4*(L-1),M)=EPC(I+4*(L-1),M)
2274 c Minimal 4-momentum transfer square for gluon-gluon (virtual) interaction
2275           QMINN=MAX(QMIN(1),QMIN(2))
2276           SI=QGSPSNORM(EPT)
2277 
2278 5         CONTINUE
2279 c 4-momentum squared (c.m. energy square for gluon-gluon (virtual)
2280 c interaction)
2281         IF(DEBUG.GE.2)WRITE (MONIOU,208)ILAD, SI,IQC,EPT
2282 208     FORMAT(2X,'PSHOT: ',I2,'-TH HARD LADDER;',
2283      *  ' MASS SQUARED FOR THE LADDDER:',E10.3/
2284      *  4X,'LADDER END FLAVORS:',2I3/4X,
2285      *  'LADDER 4-MOMENTUM: ',4E10.3)
2286 
2287         ebal(1)=.5*(wp0+wm0)-ept(1)
2288         ebal(2)=.5*(wp0-wm0)-ept(2)
2289         ebal(3)=0.d0-ept(3)
2290         ebal(4)=0.d0-ept(4)
2291         do 503 l=1,4
2292         do 501 m=1,2
2293         ebal(l)=ebal(l)-epq(l,m)
2294 501     if(iqc(m).eq.0)   ebal(l)=ebal(l)-epq(l+4,m)
2295         if(njtot.ne.0)then
2296            do 502 i=1,njtot
2297            do 502 m=1,2
2298 502        ebal(l)=ebal(l)-epjet(l,m,i)
2299         endif
2300 503        continue
2301 c            write (*,*)'ebal',ebal,si,njtot
2302 
2303           PT2=EPT(3)**2+EPT(4)**2
2304           PT=DSQRT(PT2)
2305           WW=SI+PT2
2306           SWW=DSQRT(WW)
2307 
2308           IQP(1)=MIN(1,IABS(IQC(1)))
2309           IQP(2)=MIN(1,IABS(IQC(2)))
2310 
2311 c Longitudinal momenta for the interaction
2312           WP(1)=EPT(1)+EPT(2)
2313           WP(2)=EPT(1)-EPT(2)
2314 
2315           S2MIN=MAX(QMINN,4.D0*(QT0+AMJ0))
2316 c WWMIN is the minimal energy square needed for triple s-channel gluons
2317 c production with transverse momentum squares q_t**2 above QMIN(JJ),QMINN
2318           WWMIN=(S2MIN+(PT-DSQRT(QT0))**2+(QT0+AMJ0)*(DSQRT(S2MIN/QT0)-
2319      *          1.D0))/(1.D0-DSQRT(QT0/S2MIN))
2320 c SJB/SJ is the probability for the last pair of gluons production
2321 c (SJB is the Born cross-section and SJ is the inclusive interaction
2322 c (cut ladder) cross-section)
2323           SJ=PSJINT(QMIN(1),QMIN(2),SI,IQP(1)+1,IQP(2)+1)
2324           SJB=QGSPSBINT(QMINN,SI,IQP(1)+1,IQP(2)+1)
2325 
2326         IF(DEBUG.GE.2)WRITE (MONIOU,251)S2MIN,WWMIN,SJ,SJB
2327 251     FORMAT(2X,'PSHOT: KINEMATICAL BOUNDS S2MIN=',E10.3,
2328      *   2X,'WWMIN=',E10.3/4X,'JET CROSS SETION SJ=',E10.3,
2329      *   2X,'BORN CROSS SECTION SJB=',E10.3)
2330 
2331           IF(PSRAN(B10).LT.SJB/SJ.
2332      *          OR.WW.LT.1.2D0*WWMIN)GOTO 12
2333 
2334           IF((SJ-SJB)/SJ.GT..1D0)THEN
2335             SJ1=PSJINT1(QMIN(1),QMIN(2),SI,IQP(1)+1,IQP(2)+1)
2336             SJ2=PSJINT1(QMIN(2),QMIN(1),SI,IQP(2)+1,IQP(1)+1)
2337             DSJ=(SJ2-SJ1)/(SJ-SJB)*.5D0
2338           ELSE
2339             DSJ=0.D0
2340           ENDIF
2341 c Current s-channel gluon is simulated either above the run (JJ=1) or
2342 c below it (JJ=2)
2343           JJ=INT(1.5D0+DSJ+PSRAN(B10))
2344 
2345           AQ=-(SI+AMJ0+2.D0*PT*DSQRT(QT0))/WW
2346           BQ=(QT0+AMJ0)/WW
2347           CQ=QT0/WW
2348           PQ=-AQ**2/3.D0+BQ
2349           QQ=AQ**3/13.5D0-AQ*BQ/3.D0+CQ
2350           PQ=DSQRT(-PQ/3.D0)
2351           COSQ=-.5D0*QQ/PQ**3
2352           FQ=ATAN(1.D0/COSQ**2-1.D0)
2353           IF(COSQ.LT.0.D0)FQ=PI-FQ
2354           FQ=FQ/3.D0
2355 
2356 c XMIN is the minimal longitudinal momentum transfer share in current
2357 c ladder run (corresponding to minimal 4-momentum transfer square QMIN(JJ))
2358           XMIN=1.D0+AQ/3.D0-2.D0*PQ*COS(FQ)
2359           XMAX=1.D0+AQ/3.D0-PQ*(DSQRT(3.D0)*SIN(FQ)-COS(FQ))
2360 c QQMAX is the maximal 4-momentum transfer square in the current run
2361 c (corresponding to X=XMIN and 4-momentum transfer at next simulation
2362 c step to be equal QMAX)
2363           QQMAX=QT0/(1.D0-XMAX)**2
2364           QQMIN=QT0/(1.D0-XMIN)**2
2365 
2366           IF(QQMIN.LT.S2MIN)THEN
2367             XMM=(SI-S2MIN+AMJ0+2.D0*PT*DSQRT(QT0))/WW*.5D0
2368             XMIN=1.D0-XMM-DSQRT(XMM*XMM-(QT0+AMJ0)/WW)
2369             QQMIN=QT0/(1.D0-XMIN)**2
2370 
2371             IF(QQMIN.LT.QMIN(JJ))THEN
2372               QQMIN=QMIN(JJ)
2373               XMM1=WW-2.D0*PT*DSQRT(QQMIN)+QQMIN
2374               XMM=(SI-S2MIN+AMJ0)/XMM1*.5D0
2375               XMIN=1.D0-XMM-DSQRT(XMM*XMM-AMJ0/XMM1)
2376             ENDIF
2377           ENDIF
2378 
2379 *********************************************************
2380           XM0=MAX(.5D0,1.D0-DSQRT(QT0/QMIN(JJ)))
2381           IF(XM0.GT..95D0*XMAX.OR.XM0.LT.1.05D0*XMIN)
2382      *    XM0=.5D0*(XMAX+XMIN)
2383           QM0=QT0/(1.D0-XM0)**2
2384           S2MAX=XM0*WW
2385 
2386           SJ0=PSJINT(QM0,QMIN(3-JJ),S2MAX,1,IQP(3-JJ)+1)*
2387      *    QGSPSFAP(XM0,IQP(JJ),0)+
2388      *    PSJINT(QM0,QMIN(3-JJ),S2MAX,2,IQP(3-JJ)+1)
2389      *    *QGSPSFAP(XM0,IQP(JJ),1)
2390 
2391           GB0=SJ0*QM0/QLOG*QGSPSUDS(QM0,IQP(JJ))*1.5D0
2392           IF(XM0.LE..5D0)THEN
2393             GB0=GB0*XM0**(1.D0-DELH)
2394           ELSE
2395             GB0=GB0*(1.D0-XM0)*2.D0**DELH
2396           ENDIF
2397 c XMIN, XMAX are put into power DELH to simulate X value below
2398           XMIN2=MAX(.5D0,XMIN)
2399           XMIN1=XMIN**DELH
2400           XMAX1=MIN(XMAX,.5D0)**DELH
2401           IF(XMIN.GE..5D0)THEN
2402             DJL=1.D0
2403           ELSEIF(XMAX.LT..5D0)THEN
2404             DJL=0.D0
2405           ELSE
2406             DJL=1.D0/(1.D0+((2.D0*XMIN)**DELH-1.D0)/DELH/
2407      *      DLOG(2.D0*(1.D0-XMAX)))
2408           ENDIF
2409 
2410 7         CONTINUE
2411 c Simulation of the longitudinal momentum transfer share in current
2412 c ladder run - from XMIN to XMAX according to dX * X**(DELH-1)
2413           IF(PSRAN(B10).GT.DJL)THEN
2414             X=(XMIN1+PSRAN(B10)*(XMAX1-XMIN1))**(1.D0/DELH)
2415           ELSE
2416             X=1.D0-(1.D0-XMIN2)*((1.D0-XMAX)/(1.D0-XMIN2))**PSRAN(B10)
2417           ENDIF
2418 *********************************************************
2419 
2420 c Effective momentum squared QQ in the ladder run is simulated
2421 c first as dq**2/q**4 from QMIN(J) to QMAX
2422           QQ=QQMIN/(1.D0+PSRAN(B10)*(QQMIN/QQMAX-1.D0))
2423 
2424         IF(DEBUG.GE.2)WRITE (MONIOU,253)QQ,QQMIN,QQMAX
2425 253     FORMAT(2X,'PSHOT: QQ=',E10.3,2X,'QQMIN=',E10.3,2X,
2426      *  'QQMAX=',E10.3)
2427 
2428           QT2=QQ*(1.D0-X)**2
2429           IF(QT2.LT.QT0)GOTO 7
2430 
2431           IF(QQ.GT.QMINN)THEN
2432             QMIN2=QQ
2433           ELSE
2434             QMIN2=QMINN
2435           ENDIF
2436 
2437           QT=DSQRT(QT2)
2438           CALL QGSPSCS(CCOS,SSIN)
2439 c EP3 is now 4-vector for s-channel gluon produced in current ladder run
2440           EP3(3)=QT*CCOS
2441           EP3(4)=QT*SSIN
2442           PT2=(EPT(3)-EP3(3))**2+(EPT(4)-EP3(4))**2
2443           S2MIN2=MAX(S2MIN,QMIN2)
2444 
2445           ZMIN=(QT2+AMJ0)/WW/(1.D0-X)
2446 c S2 is the maximal c.m. energy square for the parton-parton interaction
2447 c in the next ladder run
2448           S2=X*(1.D0-ZMIN)*WW-PT2
2449 c Rejection in case of too low WW2 (insufficient for elastic gluon-gluon
2450 c scattering with transverse momentum square q_t**2 above QMIN2)
2451           IF(S2.LT.S2MIN2)GOTO 7
2452 
2453           SJ1=PSJINT(QQ,QMIN(3-JJ),S2,1,IQP(3-jj)+1)
2454      *    *QGSPSFAP(X,IQP(JJ),0)
2455           SJ2=PSJINT(QQ,QMIN(3-JJ),S2,2,IQP(3-jj)+1)
2456      *    *QGSPSFAP(X,IQP(JJ),1)
2457 
2458 c GB7 is the rejection function for X and Q**2 simulation. It consists
2459 c from factor
2460 c Q**2/Qmin**2 * ln(Qmin**2/Lambda_qcd**2)/ln(Q**2/Lambda_qcd**2)
2461 c from Q**2 simulation and factor SJ/(X*WW)**DELH * const from X simulation
2462           GB7=(SJ1+SJ2)/DLOG(QT2/ALM)*QQ*QGSPSUDS(QQ,IQP(JJ))/GB0
2463 
2464 *********************************************************
2465           IF(X.LE..5D0)THEN
2466             GB7=GB7*X**(1.D0-DELH)
2467           ELSE
2468             GB7=GB7*(1.D0-X)*2.D0**DELH
2469           ENDIF
2470 *********************************************************
2471           IF(PSRAN(B10).GT.GB7)GOTO 7
2472 
2473            IF(PSRAN(B10).LT.SJ1/(SJ1+SJ2))THEN
2474              IF(IQC(JJ).EQ.0)THEN
2475                JT=1
2476                JQ=INT(1.5D0+PSRAN(B10))
2477                IQJ(1)=IPQ(JQ,JJ)
2478                IQJ(2)=0
2479                DO 31 I=1,4
2480                EQJ(I,1)=EPQ(I+4*(JQ-1),JJ)
2481 31            EQJ(I,2)=0.D0
2482             ELSE
2483               JT=2
2484               IF(IQC(JJ).GT.0)THEN
2485                 JQ=1
2486               ELSE
2487                 JQ=2
2488               ENDIF
2489               IQJ(1)=0
2490               DO 32 I=1,4
2491 32            EQJ(I,1)=0.D0
2492 
2493               IPQ(JQ,JJ)=IPQ(1,JJ)
2494               DO 135 I=1,4
2495 135           EPQ(I+4*(JQ-1),JJ)=EPQ(I,JJ)
2496             ENDIF
2497             IQ1=IQC(JJ)
2498             IQC(JJ)=0
2499 
2500           ELSE
2501             IF(IQP(JJ).NE.0)THEN
2502               IQ1=0
2503               JT=3
2504               IF(IQC(JJ).GT.0)THEN
2505                 JQ=1
2506               ELSE
2507                 JQ=2
2508               ENDIF
2509               IQJ(1)=IPQ(1,JJ)
2510               IQJ(2)=0
2511               DO 33 I=1,4
2512               EQJ(I,1)=EPQ(I,JJ)
2513 33            EQJ(I,2)=0.D0
2514 
2515             ELSE
2516               IQ1=INT(3.D0*PSRAN(B10)+1.D0)*(2*INT(.5D0+PSRAN(B10))-1)
2517               IQC(JJ)=-IQ1
2518               JT=4
2519               IF(IQ1.GT.0)THEN
2520                 JQ=1
2521               ELSE
2522                 JQ=2
2523               ENDIF
2524               IQJ(1)=IPQ(JQ,JJ)
2525               DO 34 I=1,4
2526 34            EQJ(I,1)=EPQ(I+4*(JQ-1),JJ)
2527             ENDIF
2528           ENDIF
2529           IF(DEBUG.GE.3)WRITE (MONIOU,240)JT
2530 
2531           CALL PSCAJET(QT2,IQ1,QV1,ZV1,QM1,IQV1,
2532      *          LDAU1,LPAR1,JQ)
2533           Z=(QT2+QM1(1,1))/WW/(1.D0-X)
2534           SI=X*(1.D0-Z)*WW-PT2
2535 
2536           IF(SI.GT.S2MIN2)THEN
2537             IQ=MIN(1,IABS(IQC(JJ)))+1
2538             GB=PSJINT(QQ,QMIN(3-JJ),SI,IQ,IQP(3-JJ)+1)/
2539      *      PSJINT(QQ,QMIN(3-JJ),S2,IQ,IQP(3-JJ)+1)
2540             IF(PSRAN(B10).GT.GB)GOTO 301
2541           ELSE
2542             GOTO 301
2543           ENDIF
2544 
2545           WP3=WP(JJ)*(1.D0-X)
2546           WM3=(QT2+QM1(1,1))/WP3
2547           EP3(1)=.5D0*(WP3+WM3)
2548           EP3(2)=.5D0*(WP3-WM3)*(3-2*JJ)
2549 
2550           PT3=DSQRT(EP3(3)**2+EP3(4)**2)
2551 
2552           CALL PSREC(EP3,QV1,ZV1,QM1,IQV1,LDAU1,LPAR1,IQJ,EQJ,JFL,JQ)
2553           IF(JFL.EQ.0)GOTO 301
2554 
2555           IF(JT.EQ.1)THEN
2556             IPQ(JQ,JJ)=IQJ(2)
2557             DO 35 I=1,4
2558 35          EPQ(I+4*(JQ-1),JJ)=EQJ(I,2)
2559 
2560             IF(IPC(JQ,JJ).EQ.0)THEN
2561               IPC(JQ,JJ)=IQJ(1)
2562               DO 36 I=1,4
2563 36            EPC(I+4*(JQ-1),JJ)=EQJ(I,1)
2564             ENDIF
2565 
2566           ELSEIF(JT.EQ.2)THEN
2567             IPQ(3-JQ,JJ)=IQJ(1)
2568             DO 37 I=1,4
2569 37          EPQ(I+4*(2-JQ),JJ)=EQJ(I,1)
2570 
2571           ELSEIF(JT.EQ.3)THEN
2572             IPQ(1,JJ)=IQJ(2)
2573             DO 38 I=1,4
2574 38          EPQ(I,JJ)=EQJ(I,2)
2575 
2576             IF(IPC(JQ,JJ).EQ.0)THEN
2577               IPC(JQ,JJ)=IQJ(1)
2578               DO 39 I=1,4
2579 39            EPC(I+4*(JQ-1),JJ)=EQJ(I,1)
2580             ENDIF
2581 
2582           ELSEIF(JT.EQ.4)THEN
2583             IF(IPC(JQ,JJ).EQ.0)THEN
2584                IPC(JQ,JJ)=IQJ(1)
2585                DO 40 I=1,4
2586 40            EPC(I+4*(JQ-1),JJ)=EQJ(I,1)
2587             ENDIF
2588             IF(JQ.EQ.1)THEN
2589               IPQ(1,JJ)=IPQ(2,JJ)
2590               DO 30 I=1,4
2591 30            EPQ(I,JJ)=EPQ(I+4,JJ)
2592             ENDIF
2593           ENDIF
2594 
2595           IF(IABS(IQ1).EQ.3)THEN
2596             IQQQ=8+IQ1/3*4
2597           ELSE
2598             IQQQ=8+IQ1
2599           ENDIF
2600         IF(DEBUG.GE.2)WRITE (MONIOU,209)TYQ(IQQQ),QT2,EP3
2601 209     FORMAT(2X,'PSHOT: NEW JET FLAVOR:',A2,
2602      *  ' PT SQUARED FOR THE JET:',E10.3/
2603      *  4X,'JET 4-MOMENTUM:',4E10.3)
2604           DO 8 I=1,4
2605 8         EPT(I)=EPT(I)-EP3(I)
2606 c C.m. energy square, minimal  4-momentum transfer square and gluon 4-vector
2607 c for the next ladder run
2608           QMIN(JJ)=QQ
2609           QMINN=QMIN2
2610 
2611 c Next simulation step will be considered for current ladder
2612           GOTO 5
2613 C------------------------------------------------
2614 
2615 C------------------------------------------------
2616 c The last gluon pair production (elastic scattering) in the ladder
2617 c is simulated
2618 12        CONTINUE
2619           IF(DEBUG.GE.2)WRITE (MONIOU,211)SI
2620 211     FORMAT(2X,'PSHOT: HIGHEST VIRTUALITY SUBPROCESS IN THE LADDER'/
2621      *  4X,'MASS SQUARED FOR THE PROCESS:',E10.3)
2622 
2623           XMIN=QMINN/(QMINN+SI)
2624           XMIN1=.5D0-DSQRT(.25D0-(QT0+AMJ0)/SI)
2625           XMIN=MAX(XMIN,XMIN1)
2626           TMIN=SI*XMIN
2627 
2628           IF(IQC(1).NE.0.OR.IQC(2).NE.0)THEN
2629             GB0=TMIN**2/DLOG(TMIN*(1.D0-XMIN)/ALM)**2*
2630      *      PSFBORN(SI,TMIN,IQC(1),IQC(2))
2631           ELSE
2632             GB0=.25D0*SI**2/DLOG(TMIN*(1.D0-XMIN)/ALM)**2*
2633      *      PSFBORN(SI,.5D0*SI,IQC(1),IQC(2))
2634           ENDIF
2635 
2636 C------------------------------------------------
2637 c 4-momentum transfer squared is simulated first as dq_t**2/q_t**4 from
2638 c tmin to s/2
2639 13        Q2=TMIN/(1.D0-PSRAN(B10)*(1.D0-2.D0*TMIN/SI))
2640           Z=Q2/SI
2641           QT2=Q2*(1.D0-Z)
2642           IF(PSRAN(B10).LT..5D0)THEN
2643             JM=2
2644             TQ=SI-Q2
2645           ELSE
2646             JM=1
2647             TQ=Q2
2648           ENDIF
2649 
2650           GB=Q2**2/DLOG(QT2/ALM)**2/GB0*
2651      *    PSFBORN(SI,TQ,IQC(1),IQC(2))
2652           IF(DEBUG.GE.3)WRITE (MONIOU,241)Q2,GB
2653 241     FORMAT(2X,'PSHOT: Q2=',E10.3,' GB=',E10.3)
2654 
2655           IF(PSRAN(B10).GT.GB)GOTO 13
2656 
2657           IF(IQC(1).EQ.0.AND.IQC(2).EQ.0)THEN
2658             JQ=INT(1.5D0+PSRAN(B10))
2659             IQJ(1)=IPQ(JQ,JM)
2660             DO 51 I=1,4
2661 51          EQJ(I,1)=EPQ(I+4*(JQ-1),JM)
2662 
2663             IF(PSRAN(B10).LT..5D0)THEN
2664               JT=1
2665               IF(IPQ(3-JQ,JM)*IPQ(JQ,3-JM).NE.0)THEN
2666                 IPJ=IPQ(3-JQ,JM)
2667                 IPJ1=IPQ(JQ,3-JM)
2668                 IF(IABS(IPJ).EQ.3)IPJ=IPJ*4/3
2669                 IF(IABS(IPJ1).EQ.3)IPJ1=IPJ1*4/3
2670                 DO 52 I=1,4
2671                 EPJ(I)=EPQ(I+4*(2-JQ),JM)
2672 52              EPJ1(I)=EPQ(I+4*(JQ-1),3-JM)
2673                 CALL PSJDEF(IPJ,IPJ1,EPJ,EPJ1,JFL)
2674                 IF(JFL.EQ.0)GOTO 301
2675               ELSEIF(IPQ(3-JQ,JM).NE.0)THEN
2676                 IPC(JQ,3-JM)=IPQ(3-JQ,JM)
2677                 DO 53 I=1,4
2678 53                   EPC(I+4*(JQ-1),3-JM)=EPQ(I+4*(2-JQ),JM)
2679               ELSEIF(IPQ(JQ,3-JM).NE.0)THEN
2680                 IPC(3-JQ,JM)=IPQ(JQ,3-JM)
2681                 DO 54 I=1,4
2682 54              EPC(I+4*(2-JQ),JM)=EPQ(I+4*(JQ-1),3-JM)
2683               ENDIF
2684 
2685               IQJ(2)=0
2686                      DO 55 I=1,4
2687 55            EQJ(I,2)=0.D0
2688 
2689             ELSE
2690               JT=2
2691               IQJ(2)=IPQ(3-JQ,3-JM)
2692               DO 56 I=1,4
2693 56            EQJ(I,2)=EPQ(I+4*(2-JQ),3-JM)
2694             ENDIF
2695 
2696           ELSEIF(IQC(1)*IQC(2).EQ.0)THEN
2697             IF(IQC(1)+IQC(2).GT.0)THEN
2698               JQ=1
2699             ELSE
2700               JQ=2
2701             ENDIF
2702 
2703             IF(PSRAN(B10).LT..5D0)THEN
2704               IF(IQC(JM).EQ.0)THEN
2705                 JT=3
2706                 IQJ(1)=IPQ(JQ,JM)
2707                 IQJ(2)=0
2708                 DO 57 I=1,4
2709                 EQJ(I,1)=EPQ(I+4*(JQ-1),JM)
2710 57              EQJ(I,2)=0.D0
2711 
2712                 IF(IPQ(3-JQ,JM)*IPQ(1,3-JM).NE.0)THEN
2713                   IPJ=IPQ(3-JQ,JM)
2714                   IPJ1=IPQ(1,3-JM)
2715                   IF(IABS(IPJ).EQ.3)IPJ=IPJ*4/3
2716                   IF(IABS(IPJ1).EQ.3)IPJ1=IPJ1*4/3
2717                   DO 58 I=1,4
2718                   EPJ(I)=EPQ(I+4*(2-JQ),JM)
2719 58                EPJ1(I)=EPQ(I,3-JM)
2720                   CALL PSJDEF(IPJ,IPJ1,EPJ,EPJ1,JFL)
2721                   IF(JFL.EQ.0)GOTO 301
2722                 ELSEIF(IPQ(3-JQ,JM).NE.0)THEN
2723                   IPC(JQ,3-JM)=IPQ(3-JQ,JM)
2724                   DO 59 I=1,4
2725 59                EPC(I+4*(JQ-1),3-JM)=EPQ(I+4*(2-JQ),JM)
2726                 ELSEIF(IPQ(1,3-JM).NE.0)THEN
2727                   IPC(3-JQ,JM)=IPQ(1,3-JM)
2728                   DO 60 I=1,4
2729 60                EPC(I+4*(2-JQ),JM)=EPQ(I,3-JM)
2730                 ENDIF
2731 
2732               ELSE
2733                 JT=4
2734                 IQJ(1)=0
2735                 DO 61 I=1,4
2736 61              EQJ(I,1)=0.D0
2737 
2738                 IF(IPQ(1,JM)*IPQ(3-JQ,3-JM).NE.0)THEN
2739                   IPJ=IPQ(1,JM)
2740                   IPJ1=IPQ(3-JQ,3-JM)
2741                   IF(IABS(IPJ).EQ.3)IPJ=IPJ*4/3
2742                   IF(IABS(IPJ1).EQ.3)IPJ1=IPJ1*4/3
2743                   DO 62 I=1,4
2744                   EPJ(I)=EPQ(I,JM)
2745 62                EPJ1(I)=EPQ(I+4*(2-JQ),3-JM)
2746                   CALL PSJDEF(IPJ,IPJ1,EPJ,EPJ1,JFL)
2747                   IF(JFL.EQ.0)GOTO 301
2748                 ELSEIF(IPQ(3-JQ,3-JM).NE.0)THEN
2749                   IPC(JQ,JM)=IPQ(3-JQ,3-JM)
2750                   DO 63 I=1,4
2751 63                EPC(I+4*(JQ-1),JM)=EPQ(I+4*(2-JQ),3-JM)
2752                 ELSEIF(IPQ(1,JM).NE.0)THEN
2753                   IPC(3-JQ,3-JM)=IPQ(1,JM)
2754                   DO 64 I=1,4
2755 64                EPC(I+4*(2-JQ),3-JM)=EPQ(I,JM)
2756                 ENDIF
2757               ENDIF
2758 
2759             ELSE
2760               IF(IQC(JM).EQ.0)THEN
2761                 JT=5
2762                 IQJ(2)=IPQ(3-JQ,JM)
2763                 IQJ(1)=IPQ(1,3-JM)
2764                 DO 65 I=1,4
2765                 EQJ(I,2)=EPQ(I+4*(2-JQ),JM)
2766 65              EQJ(I,1)=EPQ(I,3-JM)
2767               ELSE
2768                 JT=6
2769                 IQJ(1)=IPQ(JQ,3-JM)
2770                 DO 66 I=1,4
2771 66              EQJ(I,1)=EPQ(I+4*(JQ-1),3-JM)
2772               ENDIF
2773             ENDIF
2774 
2775           ELSEIF(IQC(1)*IQC(2).GT.0)THEN
2776             JT=7
2777             IF(IQC(1).GT.0)THEN
2778               JQ=1
2779             ELSE
2780               JQ=2
2781             ENDIF
2782             IQJ(1)=IPQ(1,3-JM)
2783             DO 67 I=1,4
2784 67          EQJ(I,1)=EPQ(I,3-JM)
2785 
2786           ELSE
2787             JT=8
2788             IF(IQC(JM).GT.0)THEN
2789               JQ=1
2790             ELSE
2791               JQ=2
2792             ENDIF
2793             IQJ(1)=0
2794             DO 68 I=1,4
2795 68          EQJ(I,1)=0.D0
2796 
2797             IF(IPQ(1,JM)*IPQ(1,3-JM).NE.0)THEN
2798               IPJ=IPQ(1,JM)
2799               IPJ1=IPQ(1,3-JM)
2800               IF(IABS(IPJ).EQ.3)IPJ=IPJ*4/3
2801               IF(IABS(IPJ1).EQ.3)IPJ1=IPJ1*4/3
2802               DO 69 I=1,4
2803               EPJ(I)=EPQ(I,JM)
2804 69            EPJ1(I)=EPQ(I,3-JM)
2805               CALL PSJDEF(IPJ,IPJ1,EPJ,EPJ1,JFL)
2806               IF(JFL.EQ.0)GOTO 301
2807             ELSEIF(IPQ(1,3-JM).NE.0)THEN
2808               IPC(JQ,JM)=IPQ(1,3-JM)
2809               DO 70 I=1,4
2810 70            EPC(I+4*(JQ-1),JM)=EPQ(I,3-JM)
2811             ELSEIF(IPQ(1,JM).NE.0)THEN
2812               IPC(3-JQ,3-JM)=IPQ(1,JM)
2813               DO 71 I=1,4
2814 71            EPC(I+4*(2-JQ),3-JM)=EPQ(I,JM)
2815             ENDIF
2816           ENDIF
2817           IF(JT.NE.8)THEN
2818             JQ2=JQ
2819           ELSE
2820             JQ2=3-JQ
2821           ENDIF
2822           IF(DEBUG.GE.3)WRITE (MONIOU,240)JT
2823 240       FORMAT(2X,'PSHOT: COLOUR CONNECTION JT=:',I1)
2824 
2825           CALL PSCAJET(QT2,IQC(JM),QV1,ZV1,QM1,IQV1,
2826      *    LDAU1,LPAR1,JQ)
2827           CALL PSCAJET(QT2,IQC(3-JM),QV2,ZV2,QM2,IQV2,
2828      *    LDAU2,LPAR2,JQ2)
2829 
2830           AMT1=QT2+QM1(1,1)
2831           AMT2=QT2+QM2(1,1)
2832 
2833           IF(DSQRT(SI).GT.DSQRT(AMT1)+DSQRT(AMT2))THEN
2834             Z=XXTWDEC(SI,AMT1,AMT2)
2835           ELSE
2836             GOTO 301
2837           ENDIF
2838 
2839           CALL QGSPSDEFTR(SI,EPT,EY)
2840 
2841           WP3=Z*DSQRT(SI)
2842           WM3=(QT2+QM1(1,1))/WP3
2843           EP3(1)=.5D0*(WP3+WM3)
2844           EP3(2)=.5D0*(WP3-WM3)
2845           QT=DSQRT(QT2)
2846           CALL QGSPSCS(CCOS,SSIN)
2847 c ep3 is now 4-vector for first s-channel gluon produced in the ladder run
2848           EP3(3)=QT*CCOS
2849           EP3(4)=QT*SSIN
2850 
2851           CALL QGSPSTRANS(EP3,EY)
2852           PT3=DSQRT(EP3(3)**2+EP3(4)**2)
2853 
2854           CALL PSREC(EP3,QV1,ZV1,QM1,IQV1,LDAU1,LPAR1,IQJ,EQJ,JFL,JQ)
2855           IF(JFL.EQ.0)GOTO 301
2856 
2857           if(iabs(IQC(JM)).eq.3)then
2858             iqqq=8+IQC(JM)/3*4
2859           else
2860             iqqq=8+IQC(JM)
2861           endif
2862           IF(DEBUG.GE.2)WRITE (MONIOU,209)TYQ(IQQQ),QT2
2863 
2864           WP3=(1.D0-Z)*DSQRT(SI)
2865           WM3=(QT2+QM2(1,1))/WP3
2866           EP3(1)=.5D0*(WP3+WM3)
2867           EP3(2)=.5D0*(WP3-WM3)
2868           EP3(3)=-QT*CCOS
2869           EP3(4)=-QT*SSIN
2870           CALL QGSPSTRANS(EP3,EY)
2871           PT3=DSQRT(EP3(3)**2+EP3(4)**2)
2872 
2873           IF(JT.EQ.1)THEN
2874             IF(IPC(JQ,JM).EQ.0)THEN
2875               IPC(JQ,JM)=IQJ(1)
2876               DO 72 I=1,4
2877 72            EPC(I+4*(JQ-1),JM)=EQJ(I,1)
2878             ENDIF
2879 
2880             IQJ(1)=IQJ(2)
2881             IQJ(2)=IPQ(3-JQ,3-JM)
2882             DO 73 I=1,4
2883             EQJ(I,1)=EQJ(I,2)
2884 73          EQJ(I,2)=EPQ(I+4*(2-JQ),3-JM)
2885 
2886           ELSEIF(JT.EQ.2)THEN
2887             IF(IPC(JQ,JM).EQ.0)THEN
2888               IPC(JQ,JM)=IQJ(1)
2889               DO 74 I=1,4
2890 74            EPC(I+4*(JQ-1),JM)=EQJ(I,1)
2891             ENDIF
2892             IF(IPC(3-JQ,3-JM).EQ.0)THEN
2893               IPC(3-JQ,3-JM)=IQJ(2)
2894               DO 75 I=1,4
2895 75            EPC(I+4*(2-JQ),3-JM)=EQJ(I,2)
2896             ENDIF
2897 
2898             IQJ(2)=IPQ(3-JQ,JM)
2899             IQJ(1)=IPQ(JQ,3-JM)
2900             DO 76 I=1,4
2901             EQJ(I,2)=EPQ(I+4*(2-JQ),JM)
2902 76          EQJ(I,1)=EPQ(I+4*(JQ-1),3-JM)
2903 
2904           ELSEIF(JT.EQ.3)THEN
2905             IF(IPC(JQ,JM).EQ.0)THEN
2906               IPC(JQ,JM)=IQJ(1)
2907               DO 77 I=1,4
2908 77            EPC(I+4*(JQ-1),JM)=EQJ(I,1)
2909             ENDIF
2910             IQJ(1)=IQJ(2)
2911             DO 78 I=1,4
2912 78          EQJ(I,1)= EQJ(I,2)
2913 
2914           ELSEIF(JT.EQ.4)THEN
2915             IQJ(2)=IQJ(1)
2916             IQJ(1)=IPQ(JQ,3-JM)
2917             DO 79 I=1,4
2918             EQJ(I,2)=EQJ(I,1)
2919 79          EQJ(I,1)=EPQ(I+4*(JQ-1),3-JM)
2920 
2921           ELSEIF(JT.EQ.5)THEN
2922             IF(IPC(3-JQ,JM).EQ.0)THEN
2923               IPC(3-JQ,JM)=IQJ(2)
2924               DO 80 I=1,4
2925 80            EPC(I+4*(2-JQ),JM)=EQJ(I,2)
2926             ENDIF
2927             IF(IPC(JQ,3-JM).EQ.0)THEN
2928               IPC(JQ,3-JM)=IQJ(1)
2929               DO 81 I=1,4
2930 81            EPC(I+4*(JQ-1),3-JM)=EQJ(I,1)
2931             ENDIF
2932 
2933             IQJ(1)=IPQ(JQ,JM)
2934             DO 82 I=1,4
2935 82          EQJ(I,1)=EPQ(I+4*(JQ-1),JM)
2936 
2937           ELSEIF(JT.EQ.6)THEN
2938             IF(IPC(JQ,3-JM).EQ.0)THEN
2939               IPC(JQ,3-JM)=IQJ(1)
2940               DO 83 I=1,4
2941 83            EPC(I+4*(JQ-1),3-JM)=EQJ(I,1)
2942             ENDIF
2943 
2944             IQJ(2)=IPQ(3-JQ,3-JM)
2945             IQJ(1)=IPQ(1,JM)
2946             DO 84 I=1,4
2947             EQJ(I,2)=EPQ(I+4*(2-JQ),3-JM)
2948 84          EQJ(I,1)=EPQ(I,JM)
2949 
2950           ELSEIF(JT.EQ.7)THEN
2951             IF(IPC(JQ,3-JM).EQ.0)THEN
2952               IPC(JQ,3-JM)=IQJ(1)
2953               DO 85 I=1,4
2954 85            EPC(I+4*(JQ-1),3-JM)=EQJ(I,1)
2955             ENDIF
2956             IQJ(1)=IPQ(1,JM)
2957             DO 86 I=1,4
2958 86          EQJ(I,1)= EPQ(I,JM)
2959           ENDIF
2960 
2961           CALL PSREC(EP3,QV2,ZV2,QM2,IQV2,LDAU2,LPAR2,IQJ,EQJ,JFL,JQ2)
2962           IF(JFL.EQ.0)GOTO 301
2963 
2964           if(iabs(IQC(3-JM)).eq.3)then
2965             iqqq=8+IQC(3-JM)/3*4
2966           else
2967             iqqq=8+IQC(3-JM)
2968           endif
2969           IF(DEBUG.GE.2)WRITE (MONIOU,209)TYQ(IQQQ),QT2
2970           IF(DEBUG.GE.2)WRITE (MONIOU,212)NJTOT
2971 212       FORMAT(2X,'PSHOT: TOTAL NUMBER OF JETS:',I2)
2972 
2973           IF(JT.EQ.1)THEN
2974             IF(IPC(3-JQ,3-JM).EQ.0)THEN
2975               IPC(3-JQ,3-JM)=IQJ(2)
2976               DO 87 I=1,4
2977 87            EPC(I+4*(2-JQ),3-JM)=EQJ(I,2)
2978             ENDIF
2979 
2980           ELSEIF(JT.EQ.2)THEN
2981             IF(IPC(3-JQ,JM).EQ.0)THEN
2982               IPC(3-JQ,JM)=IQJ(2)
2983               DO 88 I=1,4
2984 88            EPC(I+4*(2-JQ),JM)=EQJ(I,2)
2985             ENDIF
2986             IF(IPC(JQ,3-JM).EQ.0)THEN
2987               IPC(JQ,3-JM)=IQJ(1)
2988               DO 89 I=1,4
2989 89            EPC(I+4*(JQ-1),3-JM)=EQJ(I,1)
2990             ENDIF
2991 
2992           ELSEIF(JT.EQ.4)THEN
2993             IF(IPC(JQ,3-JM).EQ.0)THEN
2994               IPC(JQ,3-JM)=IQJ(1)
2995               DO 90 I=1,4
2996 90            EPC(I+4*(JQ-1),3-JM)=EQJ(I,1)
2997             ENDIF
2998 
2999           ELSEIF(JT.EQ.5)THEN
3000             IF(IPC(JQ,JM).EQ.0)THEN
3001               IPC(JQ,JM)=IQJ(1)
3002               DO 91 I=1,4
3003 91            EPC(I+4*(JQ-1),JM)=EQJ(I,1)
3004             ENDIF
3005 
3006           ELSEIF(JT.EQ.6)THEN
3007             IF(IPC(3-JQ,3-JM).EQ.0)THEN
3008               IPC(3-JQ,3-JM)=IQJ(2)
3009               DO 92 I=1,4
3010 92            EPC(I+4*(2-JQ),3-JM)=EQJ(I,2)
3011             ENDIF
3012             IF(IPC(JQ,JM).EQ.0)THEN
3013               IPC(JQ,JM)=IQJ(1)
3014               DO 93 I=1,4
3015 93            EPC(I+4*(JQ-1),JM)=EQJ(I,1)
3016             ENDIF
3017 
3018           ELSEIF(JT.EQ.7)THEN
3019             IF(IPC(JQ,JM).EQ.0)THEN
3020               IPC(JQ,JM)=IQJ(1)
3021               DO 94 I=1,4
3022 94            EPC(I+4*(JQ-1),JM)=EQJ(I,1)
3023             ENDIF
3024           ENDIF
3025 C------------------------------------------------
3026 
3027         IF(DEBUG.GE.3)WRITE (MONIOU,217)
3028 217     FORMAT(2X,'PSHOT - END')
3029         ebal(1)=.5*(wp0+wm0)
3030         ebal(2)=.5*(wp0-wm0)
3031         ebal(3)=0.d0
3032         ebal(4)=0.d0
3033         do 500 i=1,njtot
3034         do 500 m=1,2
3035         do 500 l=1,4
3036 500        ebal(l)=ebal(l)-epjet(l,m,i)
3037 c            write (*,*)'ebal',ebal
3038         RETURN
3039         END
3040 C=======================================================================
3041 
3042         SUBROUTINE PSJDEF(IPJ,IPJ1,EPJ,EPJ1,JFL)
3043 c Procedure for jet hadronization - each gluon is
3044 c considered to be splitted into quark-antiquark pair and usual soft
3045 c strings are assumed to be formed between quark and antiquark
3046 c-----------------------------------------------------------------------
3047         IMPLICIT DOUBLE PRECISION (A-H,O-Z)
3048         INTEGER DEBUG
3049         DIMENSION EPJ(4),EPJ1(4),EPT(4)
3050         COMMON /Q_AREA10/ STMASS,AM(7)
3051         COMMON /Q_AREA43/ MONIOU
3052         COMMON /Q_DEBUG/  DEBUG
3053         COMMON /Q_AREA46/ EPJET(4,2,15000),IPJET(2,15000)
3054         COMMON /Q_AREA47/ NJTOT
3055         SAVE
3056 
3057 c        if(ipj*ipj1.gt.0.and.iabs(ipj).ne.3.and.iabs(ipj).le.4.
3058 c     *  and.iabs(ipj1).ne.3.and.iabs(ipj1).le.4.or.
3059 c     *  ipj*ipj1.lt.0.and.(iabs(ipj).eq.3.or.iabs(ipj).gt.4.
3060 c     *  or.iabs(ipj1).eq.3.or.iabs(ipj1).eq.4))then
3061 c      write (*,*)'ipj,ipj1',ipj,ipj1
3062 c           read (*,*)
3063 c        endif
3064 
3065         IF(DEBUG.GE.2)WRITE (MONIOU,201)IPJ,IPJ1,EPJ,EPJ1
3066 201     FORMAT(2X,'PSJDEF: PARTON FLAVORS',
3067      *  ': IPJ=',I2,2X,'IPJ1=',I2/
3068      *  4X,'PARTON 4-MOMENTA:',2X,4(E10.3,1X))
3069         DO 1 I=1,4
3070 1       EPT(I)=EPJ(I)+EPJ1(I)
3071 
3072 c Invariant mass squared for the jet
3073         WW=QGSPSNORM(EPt)
3074 c Minimal mass squared for the jet
3075         IF(IABS(IPJ).LE.2)THEN
3076           AM1=AM(1)
3077         ELSEIF(IABS(IPJ).EQ.4)THEN
3078           AM1=AM(3)
3079         ELSE
3080           AM1=AM(2)
3081         ENDIF
3082         IF(IABS(IPJ1).LE.2)THEN
3083           AM2=AM(1)
3084         ELSEIF(IABS(IPJ1).EQ.4)THEN
3085           AM2=AM(3)
3086         ELSE
3087           AM2=AM(2)
3088         ENDIF
3089         AMJ=(AM1+AM2)**2
3090 
3091         IF(AMJ.GT.WW)THEN
3092           JFL=0
3093           RETURN
3094         ELSE
3095           JFL=1
3096         ENDIF
3097 
3098         NJTOT=NJTOT+1
3099         IF( NJTOT . GT. 15000 ) THEN
3100           WRITE(MONIOU,*)'PSJDEF: TOO MANY JETS'
3101           WRITE(MONIOU,*)'PSJDEF: NJTOT = ',NJTOT
3102           STOP
3103         ENDIF
3104         IPJET(1,NJTOT)=IPJ
3105         IPJET(2,NJTOT)=IPJ1
3106         DO 2 I=1,4
3107         EPJET(I,1,NJTOT)=EPJ(I)
3108 2       EPJET(I,2,NJTOT)=EPJ1(I)
3109 
3110         IF(DEBUG.GE.3)WRITE (MONIOU,202)
3111 202     FORMAT(2X,'PSJDEF - END')
3112         RETURN
3113         END
3114 C=======================================================================
3115 
3116         FUNCTION QGSPSJET(Q1,Q2,S,S2MIN,J,L)
3117 C QGSPSJET - inclusive hard cross-section calculation (one more run is added
3118 c to the ladder) - for any ordering
3119 c Q1 - effective momentum cutoff for current end of the ladder,
3120 c Q2 - effective momentum cutoff for opposide end of the ladder,
3121 c S - total c.m. energy squared for the ladder,
3122 c S2MIN - minimal c.m. energy squared for BORN process (above Q1 and Q2)
3123 c J - parton type at current end of the ladder (0 - g, 1 - q)
3124 c L - parton type at opposite end of the ladder (1 - g, 2 - q)
3125 C-----------------------------------------------------------------------
3126         IMPLICIT DOUBLE PRECISION (A-H,O-Z)
3127         INTEGER DEBUG
3128         COMMON /Q_AREA6/  PI,BM,AM
3129         COMMON /Q_AREA17/ DEL,RS,RS0,FS,ALF,RR,SH,DELH
3130         COMMON /Q_AREA18/ ALM,QT0,QLOG,QLL,AQT0,QTF,BET,AMJ0
3131         COMMON/AR13/X1(7),A1(7)
3132         COMMON /Q_AREA43/ MONIOU
3133         COMMON /Q_DEBUG/  DEBUG
3134         SAVE
3135 
3136         IF(DEBUG.GE.2)WRITE (MONIOU,201)S,Q1,Q2,S2MIN,J,L
3137 201     FORMAT(2X,'QGSPSJET - UNORDERED LADDER CROSS SECTION:'/
3138      *  4X,'S=',E10.3,2X,'Q1=',E10.3,2X,'Q2=',E10.3,2X,'S2MIN=',
3139      *  E10.3,2X,'J=',I1,2X,'L=',I1)
3140         QGSPSJET=0.D0
3141 
3142         P=DSQRT(1.D0-3.D0*QT0/S)
3143         COSF=(1.D0-18.D0*QT0/S)/P**3
3144         FI=ATAN(1.D0/COSF**2-1.D0)
3145         IF(COSF.LT.0.D0)FI=PI-FI
3146         FI=FI/3.D0
3147         ZMAX=(2.D0-P*(DSQRT(3.D0)*SIN(FI)-COS(FI)))/3.D0
3148         ZMIN=(1.D0-P*COS(FI))/1.5D0
3149 
3150         IF(QT0/(1.D0-ZMIN)**2.LT.S2MIN)
3151      *  ZMIN=.5D0*(1.D0+S2MIN/S-DSQRT((1.D0-S2MIN/S)**2-4.D0*QT0/S))
3152 
3153 ***********************************************************
3154         IF(1.D0-ZMIN.LT.DSQRT(QT0/Q1))THEN
3155           QMIN=QT0/(1.D0-ZMIN)**2
3156         ELSE
3157           QMIN=Q1
3158         ENDIF
3159 
3160         QMAX=QT0/(1.D0-ZMAX)**2
3161         SUD0=QGSPSUDS(QMIN,J)
3162 ***********************************************************
3163 
3164         IF(DEBUG.GE.3)WRITE (MONIOU,203)QMIN,QMAX
3165 203     FORMAT(2X,'QGSPSJET:',2X,'QMIN=',E10.3,2X,'QMAX=',E10.3)
3166         IF(QMAX.GT.QMIN)THEN
3167 
3168 c Numerical integration over transverse momentum square;
3169 c Gaussian integration is used
3170           DO 3 I=1,7
3171           DO 3 M=1,2
3172           QI=2.D0*QMIN/(1.D0+QMIN/QMAX+(2*M-3)*X1(I)*(1.D0-QMIN/QMAX))
3173 
3174           ZMAX=(1.D0-DSQRT(QT0/QI))**DELH
3175           ZMIN=((QI+MAX(QI,S2MIN))/(QI+S))**DELH
3176 
3177           FSJ=0.D0
3178 
3179         IF(DEBUG.GE.3)WRITE (MONIOU,204)QI,ZMIN,ZMAX
3180 204     FORMAT(2X,'QGSPSJET:',2X,'QI=',E10.3,2X,'ZMIN=',E10.3,2X,
3181      *  'ZMAX=',E10.3)
3182           IF(ZMAX.GT.ZMIN)THEN
3183             DO 2 I1=1,7
3184             DO 2 M1=1,2
3185             Z=(.5D0*(ZMAX+ZMIN+(2*M1-3)*X1(I1)*(ZMAX-ZMIN)))**
3186      *      (1.D0/DELH)
3187             QT=QI*(1.D0-Z)**2
3188             S2=Z*S-QI*(1.D0-Z)
3189 
3190             SJ=0.D0
3191             DO 1 K=1,2
3192 1           SJ=SJ+PSJINT(QI,Q2,S2,K,L)*QGSPSFAP(Z,J,K-1)*Z
3193 2           FSJ=FSJ+A1(I1)*SJ/DLOG(QT/ALM)/Z**DELH
3194             FSJ=FSJ*(ZMAX-ZMIN)
3195           ENDIF
3196 
3197 3         QGSPSJET=QGSPSJET+A1(I)*FSJ*QI*QGSPSUDS(QI,J)
3198           QGSPSJET=QGSPSJET*(1.D0/QMIN-1.D0/QMAX)/SUD0/DELH/18.D0
3199         ENDIF
3200         IF(DEBUG.GE.3)WRITE (MONIOU,202)QGSPSJET
3201 202     FORMAT(2X,'QGSPSJET=',E10.3)
3202         RETURN
3203         END
3204 C=======================================================================
3205 
3206         FUNCTION QGSPSJET1(Q1,Q2,S,S2MIN,J,L)
3207 C QGSPSJET1 - inclusive hard cross-section calculation (one more run is added
3208 c to the ladder) - for strict ordering
3209 c Q1 - effective momentum cutoff for current end of the ladder,
3210 c Q2 - effective momentum cutoff for opposide end of the ladder,
3211 c S - total c.m. energy squared for the ladder,
3212 c S2MIN - minimal c.m. energy squared for BORN process (above Q1 and Q2)
3213 c J - parton type at current end of the ladder (0 - g, 1 - q)
3214 c L - parton type at opposite end of the ladder (1 - g, 2 - q)
3215 C-----------------------------------------------------------------------
3216         IMPLICIT DOUBLE PRECISION (A-H,O-Z)
3217         INTEGER DEBUG
3218         COMMON /Q_AREA6/  PI,BM,AM
3219         COMMON /Q_AREA17/ DEL,RS,RS0,FS,ALF,RR,SH,DELH
3220         COMMON /Q_AREA18/ ALM,QT0,QLOG,QLL,AQT0,QTF,BET,AMJ0
3221         COMMON/AR13/X1(7),A1(7)
3222         COMMON /Q_AREA43/ MONIOU
3223         COMMON /Q_DEBUG/  DEBUG
3224         SAVE
3225 
3226         IF(DEBUG.GE.2)WRITE (MONIOU,201)S,Q1,Q2,S2MIN,J,L
3227 201     FORMAT(2X,'QGSPSJET1 - STRICTLY ORDERED LADDER CROSS SECTION:'/
3228      *  4X,'S=',E10.3,2X,'Q1=',E10.3,2X,'Q2=',E10.3,2X,'S2MIN=',
3229      *  E10.3,2X,'J=',I1,2X,'L=',I1)
3230         QGSPSJET1=0.D0
3231 
3232         P=DSQRT(1.D0-3.D0*QT0/S)
3233         COSF=(1.D0-18.D0*QT0/S)/P**3
3234         FI=ATAN(1.D0/COSF**2-1.D0)
3235         IF(COSF.LT.0.D0)FI=PI-FI
3236         FI=FI/3.D0
3237         ZMAX=(2.D0-P*(DSQRT(3.D0)*SIN(FI)-COS(FI)))/3.D0
3238         ZMIN=(1.D0-P*COS(FI))/1.5D0
3239 
3240         IF(QT0/(1.D0-ZMIN)**2.LT.S2MIN)
3241      *  ZMIN=.5D0*(1.D0+S2MIN/S-DSQRT((1.D0-S2MIN/S)**2-4.D0*QT0/S))
3242 
3243 ***********************************************************
3244         IF(1.D0-ZMIN.LT.DSQRT(QT0/Q1))THEN
3245           QMIN=QT0/(1.D0-ZMIN)**2
3246         ELSE
3247           QMIN=Q1
3248         ENDIF
3249 
3250         QMAX=QT0/(1.D0-ZMAX)**2
3251         SUD0=QGSPSUDS(QMIN,J)
3252 ***********************************************************
3253 
3254         IF(DEBUG.GE.3)WRITE (MONIOU,203)QMIN,QMAX
3255 203     FORMAT(2X,'QGSPSJET1:',2X,'QMIN=',E10.3,2X,'QMAX=',E10.3)
3256         IF(QMAX.GT.QMIN)THEN
3257 
3258 c Numerical integration over transverse momentum square;
3259 c Gaussian integration is used
3260           DO 3 I=1,7
3261           DO 3 M=1,2
3262           QI=2.D0*QMIN/(1.D0+QMIN/QMAX+(2*M-3)*X1(I)*(1.D0-QMIN/QMAX))
3263 
3264           ZMAX=(1.D0-DSQRT(QT0/QI))**DELH
3265           ZMIN=((QI+MAX(QI,S2MIN))/(QI+S))**DELH
3266 
3267           FSJ=0.D0
3268 
3269         IF(DEBUG.GE.3)WRITE (MONIOU,204)QI,ZMIN,ZMAX
3270 204     FORMAT(2X,'QGSPSJET1:',2X,'QI=',E10.3,2X,'ZMIN=',E10.3,2X,
3271      *  'ZMAX=',E10.3)
3272           IF(ZMAX.GT.ZMIN)THEN
3273             DO 2 I1=1,7
3274             DO 2 M1=1,2
3275             Z=(.5D0*(ZMAX+ZMIN+(2*M1-3)*X1(I1)*(ZMAX-ZMIN)))**
3276      *      (1.D0/DELH)
3277             QT=QI*(1.D0-Z)**2
3278             S2=Z*S-QI*(1.D0-Z)
3279 
3280             SJ=0.D0
3281             DO 1 K=1,2
3282 1           SJ=SJ+PSJINT1(QI,Q2,S2,K,L)*QGSPSFAP(Z,J,K-1)*Z
3283 2           FSJ=FSJ+A1(I1)*SJ/DLOG(QT/ALM)/Z**DELH
3284             FSJ=FSJ*(ZMAX-ZMIN)
3285           ENDIF
3286 
3287 3         QGSPSJET1=QGSPSJET1+A1(I)*FSJ*QI*QGSPSUDS(QI,J)
3288           QGSPSJET1=QGSPSJET1*(1.D0/QMIN-1.D0/QMAX)/SUD0/DELH/18.D0
3289         ENDIF
3290         IF(DEBUG.GE.3)WRITE (MONIOU,202)QGSPSJET1
3291 202     FORMAT(2X,'QGSPSJET1=',E10.3)
3292         RETURN
3293         END
3294 C=======================================================================
3295 
3296         FUNCTION PSJINT(Q1,Q2,S,M,L)
3297 C PSJINT - inclusive hard cross-section interpolation - for any ordering
3298 c in the ladder
3299 c Q1 - effective momentum cutoff for current end of the ladder,
3300 c Q2 - effective momentum cutoff for opposide end of the ladder,
3301 c S - total c.m. energy squared for the ladder,
3302 c M - parton type at current end of the ladder (1 - g, 2 - q)
3303 c L - parton type at opposite end of the ladder (1 - g, 2 - q)
3304 C-----------------------------------------------------------------------
3305         IMPLICIT DOUBLE PRECISION (A-H,O-Z)
3306         INTEGER DEBUG
3307         DIMENSION WI(3),WJ(3),WK(3)
3308         COMMON /Q_AREA18/ ALM,QT0,QLOG,QLL,AQT0,QTF,BET,AMJ0
3309         COMMON /Q_AREA29/ CSJ(17,17,68)
3310         COMMON /Q_AREA43/ MONIOU
3311         COMMON /Q_DEBUG/  DEBUG
3312         SAVE
3313 
3314         IF(DEBUG.GE.2)WRITE (MONIOU,201)S,Q1,Q2,M,L
3315 201     FORMAT(2X,'PSJINT - UNORDERED LADDER CROSS SECTION INTERPOL.:'/
3316      *  4X,'S=',E10.3,2X,'Q1=',E10.3,2X,'Q2=',E10.3,2X,
3317      *  2X,'M=',I1,2X,'L=',I1)
3318         PSJINT=0.D0
3319         QQ=MAX(Q1,Q2)
3320       IF(S.LE.MAX(4.D0*QT0,QQ))THEN
3321         IF(DEBUG.GE.3)WRITE (MONIOU,202)PSJINT
3322 202     FORMAT(2X,'PSJINT=',E10.3)
3323         RETURN
3324       ENDIF
3325 
3326         ML=17*(M-1)+34*(L-1)
3327         QLI=DLOG(Q1/QT0)/1.38629D0
3328         QLJ=DLOG(Q2/QT0)/1.38629D0
3329         SL=DLOG(S/QT0)/1.38629D0
3330         SQL=SL-MAX(QLI,QLJ)
3331         I=INT(QLI)
3332         J=INT(QLJ)
3333         K=INT(SL)
3334         IF(I.GT.13)I=13
3335         IF(J.GT.13)J=13
3336 
3337         IF(SQL.GT.10.D0)THEN
3338           IF(K.GT.14)K=14
3339           IF(I.GT.K-3)I=K-3
3340           IF(J.GT.K-3)J=K-3
3341           WI(2)=QLI-I
3342           WI(3)=WI(2)*(WI(2)-1.D0)*.5D0
3343           WI(1)=1.D0-WI(2)+WI(3)
3344           WI(2)=WI(2)-2.D0*WI(3)
3345           WJ(2)=QLJ-J
3346           WJ(3)=WJ(2)*(WJ(2)-1.D0)*.5D0
3347           WJ(1)=1.D0-WJ(2)+WJ(3)
3348           WJ(2)=WJ(2)-2.D0*WJ(3)
3349           WK(2)=SL-K
3350           WK(3)=WK(2)*(WK(2)-1.D0)*.5D0
3351           WK(1)=1.D0-WK(2)+WK(3)
3352           WK(2)=WK(2)-2.D0*WK(3)
3353 
3354           DO 1 I1=1,3
3355           DO 1 J1=1,3
3356           DO 1 K1=1,3
3357 1         PSJINT=PSJINT+CSJ(I+I1,J+J1,K+K1+ML)*WI(I1)*WJ(J1)*WK(K1)
3358           PSJINT=EXP(PSJINT)
3359         ELSEIF(SQL.LT.1.D0.AND.I+J.NE.0)THEN
3360           SQ=(S/MAX(Q1,Q2)-1.D0)/3.D0
3361           WI(2)=QLI-I
3362           WI(3)=WI(2)*(WI(2)-1.D0)*.5D0
3363           WI(1)=1.D0-WI(2)+WI(3)
3364           WI(2)=WI(2)-2.D0*WI(3)
3365           WJ(2)=QLJ-J
3366           WJ(3)=WJ(2)*(WJ(2)-1.D0)*.5D0
3367           WJ(1)=1.D0-WJ(2)+WJ(3)
3368           WJ(2)=WJ(2)-2.D0*WJ(3)
3369 
3370           DO 2 I1=1,3
3371           I2=I+I1
3372           DO 2 J1=1,3
3373           J2=J+J1
3374           K2=MAX(I2,J2)+1+ML
3375 2         PSJINT=PSJINT+CSJ(I2,J2,K2)*WI(I1)*WJ(J1)
3376           PSJINT=EXP(PSJINT)*SQ
3377         ELSEIF(K.EQ.1)THEN
3378           SQ=(S/QT0/4.D0-1.D0)/3.D0
3379           WI(2)=QLI
3380           WI(1)=1.D0-QLI
3381           WJ(2)=QLJ
3382           WJ(1)=1.D0-QLJ
3383 
3384           DO 3 I1=1,2
3385           DO 3 J1=1,2
3386 3         PSJINT=PSJINT+CSJ(I1,J1,3+ML)*WI(I1)*WJ(J1)
3387           PSJINT=EXP(PSJINT)*SQ
3388         ELSEIF(K.LT.15)THEN
3389           KL=INT(SQL)
3390           IF(I+KL.GT.12)I=12-KL
3391           IF(J+KL.GT.12)J=12-KL
3392           IF(I+J+KL.EQ.1)KL=2
3393           WI(2)=QLI-I
3394           WI(3)=WI(2)*(WI(2)-1.D0)*.5D0
3395           WI(1)=1.D0-WI(2)+WI(3)
3396           WI(2)=WI(2)-2.D0*WI(3)
3397           WJ(2)=QLJ-J
3398           WJ(3)=WJ(2)*(WJ(2)-1.D0)*.5D0
3399           WJ(1)=1.D0-WJ(2)+WJ(3)
3400           WJ(2)=WJ(2)-2.D0*WJ(3)
3401           WK(2)=SQL-KL
3402           WK(3)=WK(2)*(WK(2)-1.D0)*.5D0
3403           WK(1)=1.D0-WK(2)+WK(3)
3404           WK(2)=WK(2)-2.D0*WK(3)
3405 
3406           DO 4 I1=1,3
3407           I2=I+I1
3408           DO 4 J1=1,3
3409           J2=J+J1
3410           DO 4 K1=1,3
3411           K2=MAX(I2,J2)+KL+K1-1+ML
3412 4         PSJINT=PSJINT+CSJ(I2,J2,K2)*WI(I1)*WJ(J1)*WK(K1)
3413           PSJINT=EXP(PSJINT)
3414         ELSE
3415           K=15
3416           IF(I.GT.K-3)I=K-3
3417           IF(J.GT.K-3)J=K-3
3418           WI(2)=QLI-I
3419           WI(3)=WI(2)*(WI(2)-1.D0)*.5D0
3420           WI(1)=1.D0-WI(2)+WI(3)
3421           WI(2)=WI(2)-2.D0*WI(3)
3422           WJ(2)=QLJ-J
3423           WJ(3)=WJ(2)*(WJ(2)-1.D0)*.5D0
3424           WJ(1)=1.D0-WJ(2)+WJ(3)
3425           WJ(2)=WJ(2)-2.D0*WJ(3)
3426           WK(2)=SL-K
3427           WK(1)=1.D0-WK(2)
3428 
3429           DO 5 I1=1,3
3430           DO 5 J1=1,3
3431           DO 5 K1=1,2
3432 5         PSJINT=PSJINT+CSJ(I+I1,J+J1,K+K1+ML)*WI(I1)*WJ(J1)*WK(K1)
3433           PSJINT=EXP(PSJINT)
3434         ENDIF
3435         IF(DEBUG.GE.3)WRITE (MONIOU,202)PSJINT
3436         RETURN
3437         END
3438 C=======================================================================
3439 
3440         SUBROUTINE PSJINT0(S,SJ,SJB,M,L)
3441 C PSJINT0 - inclusive hard cross-section interpolation - for minimal
3442 c effective momentum cutoff in the ladder
3443 c S - total c.m. energy squared for the ladder,
3444 c SJ - inclusive jet cross-section,
3445 c SJB - Born cross-section,
3446 c M - parton type at current end of the ladder (0 - g, 1 - q)
3447 c L - parton type at opposite end of the ladder (0 - g, 1 - q)
3448 C-----------------------------------------------------------------------
3449         IMPLICIT DOUBLE PRECISION (A-H,O-Z)
3450         INTEGER DEBUG
3451         DIMENSION WK(3)
3452         COMMON /Q_AREA18/ ALM,QT0,QLOG,QLL,AQT0,QTF,BET,AMJ0
3453         COMMON /Q_AREA32/ CSJ(17,2,2),CSB(17,2,2)
3454         COMMON /Q_AREA43/ MONIOU
3455         COMMON /Q_DEBUG/  DEBUG
3456         SAVE
3457 
3458         IF(DEBUG.GE.2)WRITE (MONIOU,201)S,M,L
3459 201     FORMAT(2X,'PSJINT0 - HARD CROSS SECTION INTERPOLATION:'/
3460      *  4X,'S=',E10.3,2X,'M=',I1,2X,'L=',I1)
3461         SJ=0.D0
3462         SJB=0.D0
3463       IF(S.LE.4.D0*QT0)THEN
3464         IF(DEBUG.GE.3)WRITE (MONIOU,202)SJ,SJB
3465 202     FORMAT(2X,'PSJINT0: SJ=',E10.3,2X,'SJB=',E10.3)
3466         RETURN
3467       ENDIF
3468 
3469         SL=DLOG(S/QT0)/1.38629d0
3470         K=INT(SL)
3471         IF(K.EQ.1)THEN
3472           SQ=(S/QT0/4.D0-1.D0)/3.D0
3473           SJB=EXP(CSB(3,M+1,L+1))*SQ
3474           SJ=EXP(CSJ(3,M+1,L+1))*SQ
3475         ELSE
3476           IF(K.GT.14)K=14
3477           WK(2)=SL-K
3478           WK(3)=WK(2)*(WK(2)-1.D0)*.5D0
3479           WK(1)=1.D0-WK(2)+WK(3)
3480           WK(2)=WK(2)-2.D0*WK(3)
3481 
3482           DO 1 K1=1,3
3483           SJ=SJ+CSJ(K+K1,M+1,L+1)*WK(K1)
3484 1         SJB=SJB+CSB(K+K1,M+1,L+1)*WK(K1)
3485           SJB=EXP(SJB)
3486           SJ=EXP(SJ)
3487         ENDIF
3488         IF(DEBUG.GE.3)WRITE (MONIOU,202)SJ,SJB
3489         RETURN
3490         END
3491 C=======================================================================
3492 
3493         FUNCTION PSJINT1(Q1,Q2,S,M,L)
3494 C PSJINT1 - inclusive hard cross-section interpolation - for strict ordering
3495 c in the ladder
3496 c Q1 - effective momentum cutoff for current end of the ladder,
3497 c Q2 - effective momentum cutoff for opposide end of the ladder,
3498 c S - total c.m. energy squared for the ladder,
3499 c M - parton type at current end of the ladder (1 - g, 2 - q)
3500 c L - parton type at opposite end of the ladder (1 - g, 2 - q)
3501 C-----------------------------------------------------------------------
3502         IMPLICIT DOUBLE PRECISION (A-H,O-Z)
3503         INTEGER DEBUG
3504         DIMENSION WI(3),WJ(3),WK(3)
3505         COMMON /Q_AREA18/ ALM,QT0,QLOG,QLL,AQT0,QTF,BET,AMJ0
3506         COMMON /Q_AREA30/ CSJ(17,17,68)
3507         COMMON /Q_AREA43/ MONIOU
3508         COMMON /Q_DEBUG/  DEBUG
3509         SAVE
3510 
3511         IF(DEBUG.GE.2)WRITE (MONIOU,201)S,Q1,Q2,M,L
3512 201     FORMAT(2X,'PSJINT1 - STRICTLY ORDERED LADDER CROSS SECTION',
3513      *  ' INTERPOLATION:'/
3514      *  4X,'S=',E10.3,2X,'Q1=',E10.3,2X,'Q2=',E10.3,2X,
3515      *  4X,'M=',I1,2X,'L=',I1)
3516         PSJINT1=0.D0
3517         QQ=MAX(Q1,Q2)
3518       IF(S.LE.MAX(4.D0*QT0,QQ))THEN
3519         IF(DEBUG.GE.3)WRITE (MONIOU,202)PSJINT1
3520 202     FORMAT(2X,'PSJINT1=',E10.3)
3521         RETURN
3522       ENDIF
3523 
3524         ML=17*(M-1)+34*(L-1)
3525         QLI=DLOG(Q1/QT0)/1.38629d0
3526         QLJ=DLOG(Q2/QT0)/1.38629d0
3527         SL=DLOG(S/QT0)/1.38629d0
3528         SQL=SL-MAX(QLI,QLJ)
3529         I=INT(QLI)
3530         J=INT(QLJ)
3531         K=INT(SL)
3532         IF(I.GT.13)I=13
3533         IF(J.GT.13)J=13
3534 
3535         IF(SQL.GT.10.D0)THEN
3536           IF(K.GT.14)K=14
3537           IF(I.GT.K-3)I=K-3
3538           IF(J.GT.K-3)J=K-3
3539           WI(2)=QLI-I
3540           WI(3)=WI(2)*(WI(2)-1.D0)*.5D0
3541           WI(1)=1.D0-WI(2)+WI(3)
3542           WI(2)=WI(2)-2.D0*WI(3)
3543           WJ(2)=QLJ-J
3544           WJ(3)=WJ(2)*(WJ(2)-1.D0)*.5D0
3545           WJ(1)=1.D0-WJ(2)+WJ(3)
3546           WJ(2)=WJ(2)-2.D0*WJ(3)
3547           WK(2)=SL-K
3548           WK(3)=WK(2)*(WK(2)-1.D0)*.5D0
3549           WK(1)=1.D0-WK(2)+WK(3)
3550           WK(2)=WK(2)-2.D0*WK(3)
3551 
3552           DO 1 I1=1,3
3553           DO 1 J1=1,3
3554           DO 1 K1=1,3
3555 1         PSJINT1=PSJINT1+CSJ(I+I1,J+J1,K+K1+ML)*WI(I1)*WJ(J1)*WK(K1)
3556           PSJINT1=EXP(PSJINT1)
3557         ELSEIF(SQL.LT.1.D0.AND.I+J.NE.0)THEN
3558           SQ=(S/MAX(Q1,Q2)-1.D0)/3.D0
3559           WI(2)=QLI-I
3560           WI(3)=WI(2)*(WI(2)-1.D0)*.5D0
3561           WI(1)=1.D0-WI(2)+WI(3)
3562           WI(2)=WI(2)-2.D0*WI(3)
3563           WJ(2)=QLJ-J
3564           WJ(3)=WJ(2)*(WJ(2)-1.D0)*.5D0
3565           WJ(1)=1.D0-WJ(2)+WJ(3)
3566           WJ(2)=WJ(2)-2.D0*WJ(3)
3567 
3568           DO 2 I1=1,3
3569           I2=I+I1
3570           DO 2 J1=1,3
3571           J2=J+J1
3572           K2=MAX(I2,J2)+1+ML
3573 2         PSJINT1=PSJINT1+CSJ(I2,J2,K2)*WI(I1)*WJ(J1)
3574           PSJINT1=EXP(PSJINT1)*SQ
3575         ELSEIF(K.EQ.1)THEN
3576           SQ=(S/QT0/4.D0-1.D0)/3.D0
3577           WI(2)=QLI
3578           WI(1)=1.D0-QLI
3579           WJ(2)=QLJ
3580           WJ(1)=1.D0-QLJ
3581 
3582           DO 3 I1=1,2
3583           DO 3 J1=1,2
3584 3         PSJINT1=PSJINT1+CSJ(I1,J1,3+ML)*WI(I1)*WJ(J1)
3585           PSJINT1=EXP(PSJINT1)*SQ
3586         ELSEIF(K.LT.15)THEN
3587           KL=INT(SQL)
3588           IF(I+KL.GT.12)I=12-KL
3589           IF(J+KL.GT.12)J=12-KL
3590           IF(I+J+KL.EQ.1)KL=2
3591 
3592           WI(2)=QLI-I
3593           WI(3)=WI(2)*(WI(2)-1.D0)*.5D0
3594           WI(1)=1.D0-WI(2)+WI(3)
3595           WI(2)=WI(2)-2.D0*WI(3)
3596           WJ(2)=QLJ-J
3597           WJ(3)=WJ(2)*(WJ(2)-1.D0)*.5D0
3598           WJ(1)=1.D0-WJ(2)+WJ(3)
3599           WJ(2)=WJ(2)-2.D0*WJ(3)
3600           WK(2)=SQL-KL
3601           WK(3)=WK(2)*(WK(2)-1.D0)*.5D0
3602           WK(1)=1.D0-WK(2)+WK(3)
3603           WK(2)=WK(2)-2.D0*WK(3)
3604 
3605           DO 4 I1=1,3
3606           I2=I+I1
3607           DO 4 J1=1,3
3608           J2=J+J1
3609           DO 4 K1=1,3
3610           K2=MAX(I2,J2)+KL+K1-1+ML
3611 4         PSJINT1=PSJINT1+CSJ(I2,J2,K2)*WI(I1)*WJ(J1)*WK(K1)
3612           PSJINT1=EXP(PSJINT1)
3613         ELSE
3614           K=15
3615           IF(I.GT.K-3)I=K-3
3616           IF(J.GT.K-3)J=K-3
3617           WI(2)=QLI-I
3618           WI(3)=WI(2)*(WI(2)-1.D0)*.5D0
3619           WI(1)=1.D0-WI(2)+WI(3)
3620           WI(2)=WI(2)-2.D0*WI(3)
3621           WJ(2)=QLJ-J
3622           WJ(3)=WJ(2)*(WJ(2)-1.D0)*.5D0
3623           WJ(1)=1.D0-WJ(2)+WJ(3)
3624           WJ(2)=WJ(2)-2.D0*WJ(3)
3625           WK(2)=SL-K
3626           WK(1)=1.D0-WK(2)
3627 
3628           DO 5 I1=1,3
3629           DO 5 J1=1,3
3630           DO 5 K1=1,2
3631 5         PSJINT1=PSJINT1+CSJ(I+I1,J+J1,K+K1+ML)*WI(I1)*WJ(J1)*WK(K1)
3632           PSJINT1=EXP(PSJINT1)
3633         ENDIF
3634         IF(DEBUG.GE.3)WRITE (MONIOU,202)PSJINT1
3635         RETURN
3636         END
3637 C=======================================================================
3638 
3639        FUNCTION QGSPSLAM(S,A,B)
3640 c Kinematical function for two particle decay - maximal Pt-value
3641 c A - first particle mass squared,
3642 C B - second particle mass squared,
3643 C S - two particle invariant mass
3644 c-----------------------------------------------------------------------
3645        IMPLICIT DOUBLE PRECISION (A-H,O-Z)
3646         INTEGER DEBUG
3647        COMMON /Q_AREA43/ MONIOU
3648        COMMON /Q_DEBUG/  DEBUG
3649        SAVE
3650 
3651         IF(DEBUG.GE.2)WRITE (MONIOU,201)S,A,B
3652 201     FORMAT(2X,'QGSPSLAM - KINEMATICAL FUNCTION S=',E10.3,2X,'A=',
3653      *  E10.3,2X,'B=',E10.3)
3654        QGSPSLAM=.25D0/S*(S+A-B)**2-A
3655         IF(DEBUG.GE.3)WRITE (MONIOU,202)QGSPSLAM
3656 202     FORMAT(2X,'QGSPSLAM=',E10.3)
3657        RETURN
3658        END
3659 C=======================================================================
3660 
3661         FUNCTION QGSPSNORM(EP)
3662 c 4-vector squared calculation
3663 c-----------------------------------------------------------------------
3664         IMPLICIT DOUBLE PRECISION (A-H,O-Z)
3665         INTEGER DEBUG
3666         DIMENSION EP(4)
3667         COMMON /Q_AREA43/ MONIOU
3668         COMMON /Q_DEBUG/  DEBUG
3669         SAVE
3670 
3671         IF(DEBUG.GE.2)WRITE (MONIOU,201)EP
3672 201     FORMAT(2X,'QGSPSNORM - 4-VECTOR SQUARED FOR ',
3673      *  'EP=',4(E10.3,1X))
3674         QGSPSNORM=EP(1)**2
3675         DO 1 I=1,3
3676 1       QGSPSNORM=QGSPSNORM-EP(I+1)**2
3677         IF(DEBUG.GE.3)WRITE (MONIOU,202)QGSPSNORM
3678 202     FORMAT(2X,'QGSPSNORM=',E10.3)
3679         RETURN
3680         END
3681 C=======================================================================
3682 
3683         SUBROUTINE PSREC(EP,QV,ZV,QM,IQV,LDAU,LPAR,IQJ,EQJ,JFL,JQ)
3684 c Jet reconstructuring procedure - 4-momenta for all final jets are determined
3685 c EP(i) - jet 4-momentum
3686 C-----------------------------------------------------------------------
3687 c QV(i,j) - effective momentum for the branching of the parton in i-th row
3688 c on j-th level (0 - in case of no branching)
3689 c ZV(i,j) - Z-value for the branching of the parton in i-th row
3690 c on j-th level
3691 c QM(i,j) - mass squared for the parton in i-th row
3692 c on j-th level
3693 c IQV(i,j) - flavours for the parton in i-th row on j-th level
3694 c LDAU(i,j) - first daughter row for the branching of the parton in i-th row
3695 c on j-th level
3696 c LPAR(i,j) - the parent row for the parton in i-th row on j-th level
3697 C-----------------------------------------------------------------------
3698                IMPLICIT DOUBLE PRECISION (A-H,O-Z)
3699         INTEGER DEBUG
3700         DIMENSION EP(4),EP3(4),EPV(4,30,50),
3701      *  QV(30,50),ZV(30,50),QM(30,50),IQV(30,50),
3702      *  LDAU(30,49),LPAR(30,50),
3703      *  IQJ(2),EQJ(4,2),IPQ(2,30,50),EPQ(8,30,50),
3704      *  EPJ(4),EPJ1(4)
3705         COMMON /Q_AREA43/ MONIOU
3706         COMMON /Q_DEBUG/  DEBUG
3707         SAVE
3708 
3709         IF(DEBUG.GE.2)WRITE (MONIOU,201)JQ,EP,IQJ
3710 201     FORMAT(2X,'PSREC - JET RECONSTRUCTURING: JQ=',I1/
3711      *  4X,'JET 4-MOMENTUM EP=',4(E10.3,1X)/4X,'IQJ=',2I2)
3712         JFL = 1
3713         DO 1 I=1,4
3714         EPV(I,1,1)=EP(I)
3715 1       EPQ(I,1,1)=EQJ(I,1)
3716         IPQ(1,1,1)=IQJ(1)
3717 
3718         IF(IQV(1,1).EQ.0)THEN
3719           DO 2 I=1,4
3720 2         EPQ(I+4,1,1)=EQJ(I,2)
3721           IPQ(2,1,1)=IQJ(2)
3722         ENDIF
3723 
3724         NLEV=1
3725         NROW=1
3726 
3727 3       CONTINUE
3728 
3729         IF(QV(NROW,NLEV).EQ.0.D0)THEN
3730            IPJ=IQV(NROW,NLEV)
3731            IF(IPJ.NE.0)THEN
3732              IF(EPQ(1,NROW,NLEV).NE.0.D0)THEN
3733                IF(IABS(IPJ).EQ.3)IPJ=IPJ*4/3
3734               DO 4 I=1,4
3735               EPJ(I)=EPV(I,NROW,NLEV)
3736 4             EPJ1(I)=EPQ(I,NROW,NLEV)
3737               IPJ1=IPQ(1,NROW,NLEV)
3738               IF(IABS(IPJ1).EQ.3)IPJ1=IPJ1*4/3
3739               CALL PSJDEF(IPJ,IPJ1,EPJ,EPJ1,JFL)
3740         IF(DEBUG.GE.3)WRITE (MONIOU,211)IPJ,IPJ1,JFL
3741 211     FORMAT(2X,'PSREC - NEW STRING FLAVOURS: ',2I3,' JFL=',I1)
3742               IF(JFL.EQ.0)RETURN
3743             ELSE
3744               IPQ(1,NROW,NLEV)=IPJ
3745               DO 5 I=1,4
3746 5             EPQ(I,NROW,NLEV)=EPV(I,NROW,NLEV)
3747         IF(DEBUG.GE.3)WRITE (MONIOU,212)IPJ,
3748      *  (EPV(I,NROW,NLEV),I=1,4),JFL
3749 212     FORMAT(2X,'PSREC: NEW FINAL JET FLAVOR: ',I3,2X,
3750      *         'JET 4-MOMENTUM:', 4(E10.3,1X),' JFL=',I1)
3751             ENDIF
3752 
3753            ELSE
3754              IPJ=INT(2.D0*PSRAN(B10)+1.D0)*(3-2*JQ)
3755             DO 6 I=1,4
3756 6           EPJ(I)=.5D0*EPV(I,NROW,NLEV)
3757 
3758             DO 9 M=1,2
3759             IF(EPQ(1+4*(M-1),NROW,NLEV).NE.0.D0)THEN
3760               DO 7 I=1,4
3761 7             EPJ1(I)=EPQ(4*(M-1)+I,NROW,NLEV)
3762               IPJ1=IPQ(M,NROW,NLEV)
3763               IF(IABS(IPJ1).EQ.3)IPJ1=IPJ1*4/3
3764               CALL PSJDEF(IPJ,IPJ1,EPJ,EPJ1,JFL)
3765               IF(JFL.EQ.0)RETURN
3766             ELSE
3767               IPQ(M,NROW,NLEV)=IPJ
3768               DO 8 I=1,4
3769 8             EPQ(4*(M-1)+I,NROW,NLEV)=EPJ(I)
3770             ENDIF
3771 9           IPJ=-IPJ
3772           ENDIF
3773 
3774         IF(DEBUG.GE.3)WRITE (MONIOU,204)NLEV,NROW,IQV(NROW,NLEV),
3775      *  (EPV(I,NROW,NLEV),I=1,4)
3776 204     FORMAT(2X,'PSREC: FINAL JET AT LEVEL NLEV=',I2,
3777      *  ' NROW=',I2/4X,'JET FLAVOR: ',I3,2X,'JET 4-MOMENTUM:',
3778      *  4(E10.3,1X))
3779          ELSE
3780 
3781           DO 10 I=1,4
3782 10        EP3(I)=EPV(I,NROW,NLEV)
3783           CALL QGSPSDEFROT(EP3,S0X,C0X,S0,C0)
3784           Z=ZV(NROW,NLEV)
3785           QT2=(Z*(1.D0-Z))**2*QV(NROW,NLEV)
3786           LDROW=LDAU(NROW,NLEV)
3787 
3788           WP0=EP3(1)+EP3(2)
3789           WPI=Z*WP0
3790           WMI=(QT2+QM(LDROW,NLEV+1))/WPI
3791           EP3(1)=.5D0*(WPI+WMI)
3792           EP3(2)=.5D0*(WPI-WMI)
3793           QT=DSQRT(QT2)
3794           CALL QGSPSCS(C,S)
3795           EP3(3)=QT*C
3796           EP3(4)=QT*S
3797           CALL QGSPSROTAT(EP3,S0X,C0X,S0,C0)
3798 
3799           DO 11 I=1,4
3800 11        EPV(I,LDROW,NLEV+1)=EP3(I)
3801         IF(DEBUG.GE.3)WRITE (MONIOU,206)NLEV+1,LDROW,EP3
3802 206     FORMAT(2X,'PSREC: JET AT LEVEL NLEV=',I2,
3803      *  ' NROW=',I2/4X,'JET 4-MOMENTUM:',4(E10.3,1X))
3804 
3805           WPI=(1.D0-Z)*WP0
3806           WMI=(QT2+QM(LDROW+1,NLEV+1))/WPI
3807           EP3(1)=.5D0*(WPI+WMI)
3808           EP3(2)=.5D0*(WPI-WMI)
3809           EP3(3)=-QT*C
3810           EP3(4)=-QT*S
3811           CALL QGSPSROTAT(EP3,S0X,C0X,S0,C0)
3812         IF(DEBUG.GE.3)WRITE (MONIOU,206)NLEV+1,LDROW+1,EP3
3813 
3814           DO 12 I=1,4
3815 12        EPV(I,LDROW+1,NLEV+1)=EP3(I)
3816 
3817           IF(IQV(NROW,NLEV).EQ.0)THEN
3818             IF(IQV(LDROW,NLEV+1).NE.0)THEN
3819               IPQ(1,LDROW,NLEV+1)=IPQ(1,NROW,NLEV)
3820               IPQ(1,LDROW+1,NLEV+1)=IPQ(2,NROW,NLEV)
3821               DO 13 I=1,4
3822               EPQ(I,LDROW,NLEV+1)=EPQ(I,NROW,NLEV)
3823 13            EPQ(I,LDROW+1,NLEV+1)=EPQ(I+4,NROW,NLEV)
3824             ELSE
3825               IPQ(1,LDROW,NLEV+1)=IPQ(1,NROW,NLEV)
3826               IPQ(2,LDROW,NLEV+1)=0
3827               IPQ(1,LDROW+1,NLEV+1)=0
3828               IPQ(2,LDROW+1,NLEV+1)=IPQ(2,NROW,NLEV)
3829               DO 14 I=1,4
3830               EPQ(I,LDROW,NLEV+1)=EPQ(I,NROW,NLEV)
3831               EPQ(I+4,LDROW,NLEV+1)=0.D0
3832               EPQ(I,LDROW+1,NLEV+1)=0.D0
3833 14            EPQ(I+4,LDROW+1,NLEV+1)=EPQ(I+4,NROW,NLEV)
3834             ENDIF
3835           ELSE
3836             IF(IQV(LDROW,NLEV+1).EQ.0)THEN
3837               IPQ(1,LDROW,NLEV+1)=IPQ(1,NROW,NLEV)
3838               IPQ(2,LDROW,NLEV+1)=0
3839               IPQ(1,LDROW+1,NLEV+1)=0
3840               DO 15 I=1,4
3841               EPQ(I,LDROW,NLEV+1)=EPQ(I,NROW,NLEV)
3842               EPQ(I+4,LDROW,NLEV+1)=0.D0
3843 15            EPQ(I,LDROW+1,NLEV+1)=0.D0
3844             ELSE
3845               IPQ(1,LDROW,NLEV+1)=0
3846               IPQ(1,LDROW+1,NLEV+1)=0
3847               IPQ(2,LDROW+1,NLEV+1)=IPQ(1,NROW,NLEV)
3848               DO 16 I=1,4
3849               EPQ(I,LDROW,NLEV+1)=0.D0
3850               EPQ(I,LDROW+1,NLEV+1)=0.D0
3851 16            EPQ(I+4,LDROW+1,NLEV+1)=EPQ(I,NROW,NLEV)
3852             ENDIF
3853           ENDIF
3854 
3855           NROW=LDROW
3856           NLEV=NLEV+1
3857           GOTO 3
3858         ENDIF
3859 
3860 17      CONTINUE
3861         IF(NLEV.EQ.1)THEN
3862           IQJ(1)=IPQ(1,1,1)
3863           DO 18 I=1,4
3864 18        EQJ(I,1)=EPQ(I,1,1)
3865           IF(IQV(1,1).EQ.0)THEN
3866             IQJ(2)=IPQ(2,1,1)
3867             DO 19 I=1,4
3868 19          EQJ(I,2)=EPQ(I+4,1,1)
3869           ENDIF
3870         IF(DEBUG.GE.3)WRITE (MONIOU,202)iqj
3871 202     FORMAT(2X,'PSREC - END',2x,'iqj=',2i2)
3872         RETURN
3873       ENDIF
3874 
3875         LPROW=LPAR(NROW,NLEV)
3876 
3877         IF(LDAU(LPROW,NLEV-1).EQ.NROW)THEN
3878            IF(IQV(NROW,NLEV).EQ.0)THEN
3879              IF(EPQ(1,LPROW,NLEV-1).EQ.0.D0)THEN
3880               IPQ(1,LPROW,NLEV-1)=IPQ(1,NROW,NLEV)
3881               DO 20 I=1,4
3882 20            EPQ(I,LPROW,NLEV-1)=EPQ(I,NROW,NLEV)
3883             ENDIF
3884             IPQ(1,NROW+1,NLEV)=IPQ(2,NROW,NLEV)
3885             DO 21 I=1,4
3886 21          EPQ(I,NROW+1,NLEV)=EPQ(I+4,NROW,NLEV)
3887           ELSE
3888             IF(IQV(LPROW,NLEV-1).EQ.0)THEN
3889               IF(EPQ(1,LPROW,NLEV-1).EQ.0.D0)THEN
3890                 IPQ(1,LPROW,NLEV-1)=IPQ(1,NROW,NLEV)
3891                 DO 22 I=1,4
3892 22              EPQ(I,LPROW,NLEV-1)=EPQ(I,NROW,NLEV)
3893               ENDIF
3894             ELSE
3895               IPQ(1,NROW+1,NLEV)=IPQ(1,NROW,NLEV)
3896               DO 23 I=1,4
3897 23            EPQ(I,NROW+1,NLEV)=EPQ(I,NROW,NLEV)
3898             ENDIF
3899           ENDIF
3900           NROW=NROW+1
3901           GOTO 3
3902 
3903         ELSE
3904           IF(IQV(NROW,NLEV).EQ.0)THEN
3905             IF(IQV(LPROW,NLEV-1).EQ.0)THEN
3906               IF(EPQ(5,LPROW,NLEV-1).EQ.0.D0)THEN
3907                 IPQ(2,LPROW,NLEV-1)=IPQ(2,NROW,NLEV)
3908                 DO 24 I=1,4
3909 24              EPQ(I+4,LPROW,NLEV-1)=EPQ(I+4,NROW,NLEV)
3910               ENDIF
3911             ELSE
3912               IF(EPQ(1,LPROW,NLEV-1).EQ.0.D0)THEN
3913                 IPQ(1,LPROW,NLEV-1)=IPQ(2,NROW,NLEV)
3914                 DO 25 I=1,4
3915 25              EPQ(I,LPROW,NLEV-1)=EPQ(I+4,NROW,NLEV)
3916               ENDIF
3917             ENDIF
3918           ELSE
3919             IF(IQV(LPROW,NLEV-1).EQ.0.AND.
3920      *      EPQ(5,LPROW,NLEV-1).EQ.0.D0)THEN
3921                 IPQ(2,LPROW,NLEV-1)=IPQ(1,NROW,NLEV)
3922                 DO 26 I=1,4
3923 26              EPQ(I+4,LPROW,NLEV-1)=EPQ(I,NROW,NLEV)
3924             ENDIF
3925           ENDIF
3926 
3927           NROW=LPROW
3928           NLEV=NLEV-1
3929           GOTO 17
3930         ENDIF
3931         END
3932 C=======================================================================
3933 
3934       FUNCTION PSREJS(S,Z,IQQ)
3935 c PSREJS - rejection function for the energy sharing for semihard
3936 c interaction (Hi_semihard(S)/S**delh)
3937 c S - energy squared for the semihard interaction,
3938 c Z - impact parameter factor, Z=exp(-b**2/Rp),
3939 c IQQ - type of the hard interaction (0 - gg, 1 - qg, 2 - gq)
3940 c-----------------------------------------------------------------------
3941       IMPLICIT DOUBLE PRECISION (A-H,O-Z)
3942         INTEGER DEBUG
3943       COMMON /Q_AREA17/ DEL,RS,RS0,FS,ALF,RR,SH,DELH
3944       COMMON /Q_AREA18/ ALM,QT0,QLOG,QLL,AQT0,QTF,BET,AMJ0
3945       COMMON /Q_AR13/    X1(7),A1(7)
3946       COMMON /Q_AREA43/ MONIOU
3947       COMMON /Q_DEBUG/  DEBUG
3948       SAVE
3949 
3950         IF(DEBUG.GE.2)WRITE (MONIOU,201)S,Z,IQQ
3951 201     FORMAT(2X,'PSREJS - REJECTION FUNCTION TABULATION: '/
3952      *  4X,'S=',E10.3,2X,'Z=',E10.3,2X,'IQQ=',I1)
3953       XMIN=4.D0*(QT0+AMJ0)/S
3954       XMIN=XMIN**(DELH-DEL)
3955       PSREJS=0.D0
3956 
3957 c Numerical integration over Z1
3958       DO 2 I=1,7
3959       DO 2 M=1,2
3960       Z1=(.5D0*(1.D0+XMIN-(2*M-3)*X1(I)*(1.D0-XMIN)))**(1.D0/
3961      *(DELH-DEL))
3962 
3963 c SJ is the inclusive hard partonic interaction
3964 c cross-section (inclusive cut ladder cross section) for minimal
3965 c 4-momentum transfer squre QT0 and c.m. energy square s_hard = exp YJ;
3966 c SJB - Born cross-section
3967       YJ=DLOG(Z1*S)
3968       CALL PSJINT0(Z1*S,SJ,SJB,IQQ,0)
3969 c GY= Sigma_hard_tot(YJ,QT0) - total hard partonic
3970 c interaction cross-section for minimal 4-momentum transfer square QT0 and
3971 c c.m. energy square s_hard = exp YJ; SH=pi*R_hard**2 (R_hard**2=4/QT0)
3972       GY=2.D0*SH*PSGINT((SJ-SJB)/SH*.5D0)+SJB
3973       RH=RS0-ALF*DLOG(Z1)
3974 
3975       IF(IQQ.NE.0)THEN
3976         PSREJS=PSREJS+A1(I)*GY/(Z1*S)**DELH*Z**(RS0/RH)/RH*
3977      *  (1.D0-Z1)*BET
3978       ELSE
3979         ST2=0.D0
3980         DO 1 J=1,7
3981 1       ST2=ST2+A1(J)*((1.D0-Z1**(.5D0*(1.D0+X1(J))))*
3982      *  (1.D0-Z1**(.5D0*(1.D0-X1(J)))))**BET
3983 
3984         PSREJS=PSREJS-A1(I)*DLOG(Z1)*GY/(Z1*S)**DELH*Z**(RS0/RH)/RH*ST2
3985       ENDIF
3986 2     CONTINUE
3987       PSREJS=DLOG(PSREJS*(1.D0-XMIN)/Z)
3988         IF(DEBUG.GE.2)WRITE (MONIOU,202)PSREJS
3989 202     FORMAT(2X,'PSREJS=',E10.3)
3990       RETURN
3991       END
3992 C=======================================================================
3993 
3994         FUNCTION PSREJV(S)
3995 c PSREJV - rejection function for the energy sharing for quark-quark hard
3996 c interaction (sigma_hard(S)/S**delh)
3997 c S - energy squared for the hard interaction
3998 c-----------------------------------------------------------------------
3999         IMPLICIT DOUBLE PRECISION (A-H,O-Z)
4000         INTEGER DEBUG
4001         COMMON /Q_AREA17/ DEL,RS,RS0,FS,ALF,RR,SH,DELH
4002         COMMON /Q_AREA18/ ALM,QT0,QLOG,QLL,AQT0,QTF,BET,AMJ0
4003         COMMON /Q_AREA43/ MONIOU
4004         COMMON /Q_DEBUG/  DEBUG
4005         SAVE
4006 
4007         IF(DEBUG.GE.2)WRITE (MONIOU,201)S
4008 201     FORMAT(2X,'PSREJV - REJECTION FUNCTION TABULATION: ',
4009      *  'S=',E10.3)
4010 c SJ is the inclusive hard QUARK-QUARK interaction
4011 c cross-section (inclusive cut ladder cross section) for minimal
4012 c 4-momentum transfer squre QT0 and c.m. energy square s;
4013 c SJB - Born cross-section
4014         CALL PSJINT0(S,SJ,SJB,1,1)
4015 
4016 c GY= Sigma_hard_tot(YJ,QT0) - total hard partonic (quark-quark)
4017 c interaction cross-section for minimal 4-momentum transfer square QT0 and
4018 c c.m. energy square s; SH=pi*R_hard**2 (R_hard**2=4/QT0)
4019         GY=2.D0*SH*PSGINT((SJ-SJB)/SH*.5D0)+SJB
4020         PSREJV=DLOG(GY/S**DELH)
4021         IF(DEBUG.GE.3)WRITE (MONIOU,202)PSREJV
4022 202     FORMAT(2X,'PSREJV=',E10.3)
4023         RETURN
4024         END
4025 C=======================================================================
4026 
4027         FUNCTION PSRJINT(YJ,Z0,IQQ)
4028 c PSRJINT - Rejection function for the energy sharing (Hi_semih(S)/S**delh)
4029 c YJ=ln S,
4030 c Z0 - impact parameter factor, Z0=exp(-b**2/Rp),
4031 c IQQ - type of hard interaction (0 - gg; 1 - qg, 2 - gq; 3 - qq)
4032 c-----------------------------------------------------------------------
4033         IMPLICIT DOUBLE PRECISION (A-H,O-Z)
4034         INTEGER DEBUG
4035         DIMENSION A(3)
4036         COMMON /Q_AREA1/  IA(2),ICZ,ICP
4037         COMMON /Q_AREA17/ DEL,RS,RS0,FS,ALF,RR,SH,DELH
4038         COMMON /Q_AREA18/ ALM,QT0,QLOG,QLL,AQT0,QTF,BET,AMJ0
4039         COMMON /Q_AREA23/ RJV(50)
4040         COMMON /Q_AREA24/ RJS(50,5,10)
4041         COMMON /Q_AREA43/ MONIOU
4042         COMMON /Q_DEBUG/  DEBUG
4043         SAVE
4044 
4045         IF(DEBUG.GE.2)WRITE (MONIOU,201)YJ,Z0,IQQ
4046 201     FORMAT(2X,'PSRJINT - REJECTION FUNCTION INTERPOLATION:'/
4047      *  4X,'YJ=',E10.3,2X,'Z0=',E10.3,2X,'IQQ=',I1)
4048         YY=(YJ-AQT0)*2.D0
4049 *       JY=INT(YY)
4050         JY=MIN(48,INT(YY))       !  modified 15.oct.03 D.H.
4051 
4052         IF(IQQ.EQ.3)THEN
4053           IF(JY.EQ.0)THEN
4054             PSRJINT=EXP(RJV(1))*YY+(EXP(RJV(2))-2.D0*
4055      *      EXP(RJV(1)))*YY*(YY-1.D0)*.5D0
4056           ELSE
4057             PSRJINT=EXP(RJV(JY)+(RJV(JY+1)-RJV(JY))*(YY-JY)
4058      *      +(RJV(JY+2)+RJV(JY)-2.D0*RJV(JY+1))*(YY-JY)*
4059      *      (YY-JY-1.D0)*.5D0)
4060           ENDIF
4061         ELSE
4062           Z=Z0**(RS/RS0)
4063           IQ=(IQQ+1)/2+1+2*(ICZ-1)
4064           JZ=INT(5.D0*Z)
4065           IF(JZ.GT.3)JZ=3
4066           WZ=5.D0*Z-JZ
4067 
4068           IF(JZ.EQ.0)THEN
4069             I1=2
4070           ELSE
4071             I1=1
4072           ENDIF
4073 
4074           DO 1 I=I1,3
4075           J1=JZ+I-1
4076           IF(JY.EQ.0)THEN
4077             A(I)=EXP(RJS(1,J1,IQ))*YY+(EXP(RJS(2,J1,IQ))-2.D0*
4078      *      EXP(RJS(1,J1,IQ)))*YY*(YY-1.D0)*.5D0
4079             IF(A(I).GT.0.D0)THEN
4080               A(I)=DLOG(A(I))
4081             ELSE
4082               A(I)=-80.D0
4083             ENDIF
4084           ELSE
4085             A(I)=RJS(JY,J1,IQ)+(RJS(JY+1,J1,IQ)-
4086      *      RJS(JY,J1,IQ))*(YY-JY)
4087      *      +(RJS(JY+2,J1,IQ)+RJS(JY,J1,IQ)-2.D0*
4088      *      RJS(JY+1,J1,IQ))*(YY-JY)*(YY-JY-1.D0)*.5D0
4089           ENDIF
4090 1         CONTINUE
4091 
4092           IF(JZ.NE.0)THEN
4093             PSRJINT=EXP(A(1)+(A(2)-A(1))*WZ+(A(3)+A(1)-2.D0*A(2))*WZ*
4094      *      (WZ-1.D0)*.5D0)*Z
4095           ELSE
4096             PSRJINT=(EXP(A(2))*WZ+(EXP(A(3))-2.D0*EXP(A(2)))*WZ*
4097      *      (WZ-1.D0)*.5D0)*Z
4098             IF(PSRJINT.LE.0.D0)PSRJINT=1.D-10
4099           ENDIF
4100         ENDIF
4101         IF(DEBUG.GE.3)WRITE (MONIOU,202)PSRJINT
4102 202     FORMAT(2X,'PSRJINT=',E10.3)
4103         RETURN
4104         END
4105 C=======================================================================
4106 
4107         FUNCTION PSROOT(QLMAX,G,J)
4108 c PSROOT - effective momentum tabulation for given set of random number
4109 c values and maximal effective momentum QMAX values - according to the
4110 c probability of branching: (1 - timelike Sudakov formfactor)
4111 c QLMAX - ln QMAX/16/QTF,
4112 c G - dzeta number (some function of ksi)
4113 c J - type of the parton (1-g,2-q)
4114 c-----------------------------------------------------------------------
4115         IMPLICIT DOUBLE PRECISION (A-H,O-Z)
4116         INTEGER DEBUG
4117         COMMON /Q_AREA43/ MONIOU
4118         COMMON /Q_DEBUG/  DEBUG
4119         SAVE
4120 
4121         IF(DEBUG.GE.2)WRITE (MONIOU,201)QLMAX,G,J
4122 201     FORMAT(2X,'PSQINT - BRANCHING MOMENTUM TABULATION:'/
4123      *  4X,'QLMAX=',E10.3,2X,'G=',E10.3,2X,'J=',I1)
4124         QL0=0.D0
4125         QL1=QLMAX
4126         F0=-G
4127         F1=1.D0-G
4128         SUD0=-DLOG(PSUDINT(QLMAX,J))
4129 
4130 1       QL2=QL1-(QL1-QL0)*F1/(F1-F0)
4131         IF(QL2.LT.0.D0)THEN
4132           QL2=0.D0
4133           F2=-G
4134         ELSEIF(QL2.GT.QLMAX)THEN
4135           QL2=QLMAX
4136           F2=1.D0-G
4137         ELSE
4138           F2=-DLOG(PSUDINT(QL2,J))/SUD0-G
4139         ENDIF
4140 
4141         IF(ABS(F2).GT.1.D-3)THEN
4142           QL0=QL1
4143           QL1=QL2
4144           F0=F1
4145           F1=F2
4146           GOTO 1
4147         ELSE
4148           PSROOT=QL2
4149         ENDIF
4150         IF(DEBUG.GE.3)WRITE (MONIOU,202)PSROOT
4151 202     FORMAT(2X,'PSROOT=',E10.3)
4152         RETURN
4153         END
4154 C=======================================================================
4155 
4156         SUBROUTINE QGSPSROTAT(EP,S0X,C0X,S0,C0)
4157 c Spacial rotation to the lab. system for 4-vector EP
4158 c-----------------------------------------------------------------------
4159         IMPLICIT DOUBLE PRECISION (A-H,O-Z)
4160         INTEGER DEBUG
4161         DIMENSION EP(4),EP1(3)
4162         COMMON /Q_AREA43/ MONIOU
4163         COMMON /Q_DEBUG/  DEBUG
4164         SAVE
4165 
4166         IF(DEBUG.GE.2)WRITE (MONIOU,201)EP,S0X,C0X,S0,C0
4167 201     FORMAT(2X,'QGSPSROTAT - SPACIAL ROTATION:'/4X,
4168      *  '4-VECTOR EP=',4(E10.3,1X)/4X,'S0X=',E10.3,'C0X=',E10.3,
4169      *  2X,'S0=',E10.3,'C0=',E10.3)
4170         EP1(3)=EP(4)
4171         EP1(2)=EP(2)*S0+EP(3)*C0
4172         EP1(1)=EP(2)*C0-EP(3)*S0
4173 
4174         EP(2)=EP1(1)
4175         EP(4)=EP1(2)*S0X+EP1(3)*C0X
4176         EP(3)=EP1(2)*C0X-EP1(3)*S0X
4177         IF(DEBUG.GE.3)WRITE (MONIOU,202)EP
4178 202     FORMAT(2X,'QGSPSROTAT: ROTATED 4-VECTOR EP=',
4179      *  2X,4E10.3)
4180         RETURN
4181         END
4182 C=======================================================================
4183 
4184         FUNCTION PSQINT(QLMAX,G,J)
4185 c PSQINT - effective momentum interpolation for given random number G
4186 c and maximal effective momentum QMAX
4187 c QLMAX - ln QMAX/16/QTF,
4188 c G - random number (0<G<1)
4189 c J - type of the parton (1-g,2-q)
4190 c-----------------------------------------------------------------------
4191         IMPLICIT DOUBLE PRECISION (A-H,O-Z)
4192         INTEGER DEBUG
4193         DIMENSION WI(3),WK(3)
4194         COMMON /Q_AREA18/ ALM,QT0,QLOG,QLL,AQT0,QTF,BET,AMJ0
4195         COMMON /Q_AREA34/ QRT(10,101,2)
4196         COMMON /Q_AREA43/ MONIOU
4197         COMMON /Q_DEBUG/  DEBUG
4198         SAVE
4199 
4200         IF(DEBUG.GE.2)WRITE (MONIOU,201)QLMAX,G,J
4201 201     FORMAT(2X,'PSQINT - BRANCHING MOMENTUM INTERPOLATION:'/
4202      *  4X,'QLMAX=',E10.3,2X,'G=',E10.3,2X,'J=',I1)
4203         QLI=QLMAX/1.38629d0
4204         SUD0=1.D0/PSUDINT(QLMAX,J)
4205         SL=100.D0*DLOG(1.D0-G*(1.D0-SUD0))/DLOG(SUD0)
4206         I=INT(QLI)
4207         K=INT(SL)
4208         IF(K.GT.98)K=98
4209         WK(2)=SL-K
4210         WK(3)=WK(2)*(WK(2)-1.D0)*.5D0
4211         WK(1)=1.D0-WK(2)+WK(3)
4212         WK(2)=WK(2)-2.D0*WK(3)
4213         PSQINT=0.D0
4214 
4215         IF(I.GT.7)I=7
4216         WI(2)=QLI-I
4217         WI(3)=WI(2)*(WI(2)-1.D0)*.5D0
4218         WI(1)=1.D0-WI(2)+WI(3)
4219         WI(2)=WI(2)-2.D0*WI(3)
4220 
4221         DO 1 K1=1,3
4222         DO 1 I1=1,3
4223 1       PSQINT=PSQINT+QRT(I+I1,K+K1,J)*WI(I1)*WK(K1)
4224         IF(PSQINT.LE.0.D0)PSQINT=0.D0
4225         PSQINT=16.D0*QTF*EXP(PSQINT)
4226         IF(DEBUG.GE.3)WRITE (MONIOU,202)PSQINT
4227 202     FORMAT(2X,'PSQINT=',E10.3)
4228         RETURN
4229         END
4230 C=======================================================================
4231 
4232         SUBROUTINE PSSHAR(LS,NHP,NW,NT)
4233 c Inelastic interaction - energy sharing procedure:
4234 c LS - total number of  cut soft pomeron blocks (froissarons),
4235 c NHP - total number of hard pomerons,
4236 c NW - number of interacting projectile nucleons (excluding diffracted),
4237 c NT - number of target nucleons in active state
4238 c-----------------------------------------------------------------------
4239         IMPLICIT DOUBLE PRECISION (A-H,O-Z)
4240         INTEGER DEBUG
4241 C D.H.  REAL*16 GBH,GBH0
4242         DIMENSION WP(56),WM(56),WHA(4000),WHB(4000),LHA0(56),
4243      *  LHB0(56),IZP(56),IZT(56),WP0H(56),WM0H(56),
4244      *  WPP(2),WMM(2),EP3(4),LQA0(56),LQB0(56),IPC(2,2),EPC(8,2),
4245      *  ILA(56),ILB(56),ELA(4,56),ELB(4,56),EP(4),EP1(4)
4246         COMMON /Q_AREA1/  IA(2),ICZ,ICP
4247         COMMON /Q_AREA2/  S,Y0,WP0,WM0
4248         COMMON /Q_AREA9/  LQA(56),LQB(56),NQS(1000),IAS(1000),
4249      *  IBS(1000),LHA(56),LHB(56),ZH(4000),IAH(4000),IBH(4000),
4250      *  IQH(4000),LVA(56),LVB(56)
4251         COMMON /Q_AREA10/ STMASS,AM(7)
4252         COMMON /Q_AREA11/ B10
4253         COMMON /Q_AREA12/ NSH
4254         COMMON /Q_AREA17/ DEL,RS,RS0,FS,ALFP,RR,SH,DELH
4255         COMMON /Q_AREA18/ ALM,QT0,QLOG,QLL,AQT0,QTF,BET,AMJ0
4256         COMMON /Q_AREA19/ AHL(5)
4257         COMMON /Q_AREA20/ WPPP
4258         COMMON /Q_AREA25/ AHV(5)
4259         COMMON /Q_AREA43/ MONIOU
4260         COMMON /Q_DEBUG/  DEBUG
4261         COMMON /Q_AREA47/ NJTOT
4262 
4263 ctp from epos
4264       integer ng1evt,ng2evt,ikoevt
4265       real    rglevt,sglevt,eglevt,fglevt,typevt
4266       common/c2evt/ng1evt,ng2evt,rglevt,sglevt,eglevt,fglevt,ikoevt
4267      *,typevt            !in epos.inc
4268 
4269         SAVE
4270         EXTERNAL PSRAN
4271         DATA xdiv /100.D0/
4272 
4273         IF(DEBUG.GE.1)WRITE (MONIOU,201)NW,NT,NHP,LS
4274 201     FORMAT(2X,'PSSHARE - ENERGY SHARING PROCEDURE'/
4275      *  4X,'NUMBER OF WOUNDED PROJECTILE NUCLEONS(HADRONS) NW=',I2/
4276      *  4X,'NUMBER OF TARGET NUCLEONS IN THE ACTIVE STATE NT=',I2/
4277      *  4X,'NUMBER OF SEMIHARD BLOCKS NHP=',I3/
4278      *  4X,'NUMBER OF SOFT POMERON BLOCKS LS=',I3)
4279         NSH1=NSH
4280         DO 101 I=1,NW
4281 101     LQA0(I)=LQA(I)
4282         DO 102 I=1,NT
4283 102     LQB0(I)=LQB(I)
4284 
4285 100     NSH=NSH1
4286         NJTOT=0
4287         DO 103 I=1,NW
4288 103     LQA(I)=LQA0(I)
4289         DO 104 I=1,NT
4290 104     LQB(I)=LQB0(I)
4291 c-------------------------------------------------
4292 c Initial nucleons (hadrons) types recording
4293         IF(IA(1).NE.1)THEN
4294 c IZP(i) - i-th projectile nucleons type (proton - 2, neutron - 3)
4295           DO 1 I=1,NW
4296 1         IZP(I)=INT(2.5+PSRAN(B10))
4297         ELSE
4298 c IZP(1)=ICP - projectile hadron type
4299           IZP(1)=ICP
4300         ENDIF
4301         IF(IA(2).NE.1)THEN
4302 c IZT(j) - j-th target nucleon type (proton - 2 or neutron - 3)
4303           DO 2 I=1,NT
4304 2         IZT(I)=INT(2.5+PSRAN(B10))
4305         ELSE
4306 c Target proton
4307          IZT(1)=2
4308         ENDIF
4309 c-------------------------------------------------
4310 
4311 c WREJ - parameter for energy sharing (to minimise rejection)
4312         WREJ=.0001D0
4313 
4314 3       CONTINUE
4315 
4316         IF(NHP.NE.0)THEN
4317         IF(DEBUG.GE.3)WRITE (MONIOU,211)NHP
4318 211     FORMAT(2X,'PSSHARE: NUMBER OF HARD POMERONS NHP=',I3)
4319 c-------------------------------------------------
4320 c-------------------------------------------------
4321 c Rejection function initialization:
4322 c-------------------------------------------------
4323 c energy-momentum will be shared between pomerons
4324 c according to s**DEL dependence for soft pomeron and
4325 c according to s**DELH dependence for pomeron with hard block,
4326 c then rejection is used according to real Sigma_hard(s) dependence.
4327 c Rejection is expected to be minimal for the uniform energy
4328 c distribution between pomerons ( s_hard = s / LHA(I) / LHB(J) )
4329           GBH0=.6D0
4330 c NREJ - total number of rejections
4331           NREJ=0
4332           NHP1=NHP
4333 
4334           DO 5 IH=1,NHP1
4335         IF(DEBUG.GE.3)WRITE (MONIOU,212)IH
4336 212     FORMAT(2X,'PSSHARE: GBH-INI; CONTRIBUTION FROM ',I3,
4337      *   '-TH HARD POMERON')
4338 c-------------------------------------------------
4339 c LHA(i) (LHB(j)) - total number of cut hard blocks, connected to i-th projectile
4340 c (j-th target) nucleon (hadron);
4341 c IAH(ih) (IBH(ih)) - number (position in array) of the projectile (target) nucleon,
4342 c connected to ih-th hard block;
4343 c ZH(ih) - factor exp(-R_ij/R_p) for ih-th hard block;
4344 c IQH(ih) - type of the hard interaction: 0 - gg, 1 - qg, 2 - gq, 3 - qq
4345           IQQ=IQH(IH)
4346           Z=ZH(IH)
4347           I=IAH(IH)
4348           J=IBH(IH)
4349 
4350 c Uniform energy distribution between hard pomerons
4351           ZA=1.D0/LHA(I)
4352           ZB=1.D0/LHB(J)
4353 c SI - c.m. energy squared for one hard block
4354           SI=ZA*ZB*S
4355 
4356           IF(SI.LT.4.D0*(QT0+AMJ0))THEN
4357 c-------------------------------------------------
4358 c One hard pomeron is removed (the energy is insufficient to simulate
4359 c great number of pomerons)
4360 c-------------------------------------------------
4361             NHP=NHP-1
4362             LHA(I)=LHA(I)-1
4363             LHB(J)=LHB(J)-1
4364 
4365             IF(IQQ.EQ.1)THEN
4366               LVA(I)=0
4367             ELSEIF(IQQ.EQ.2)THEN
4368               LVB(J)=0
4369             ELSEIF(IQQ.EQ.3)THEN
4370               LVA(I)=0
4371               LVB(J)=0
4372             ENDIF
4373 c Rewriting of other hard pomerons characteristics
4374             IF(NHP.GE.IH)THEN
4375               DO 4 IH1=IH,NHP
4376               IQH(IH1)=IQH(IH1+1)
4377               ZH(IH1)=ZH(IH1+1)
4378               IAH(IH1)=IAH(IH1+1)
4379 4             IBH(IH1)=IBH(IH1+1)
4380             ENDIF
4381 c End of removing - event will be simulated from the very beginning
4382 c-------------------------------------------------
4383             GOTO 3
4384           ENDIF
4385 
4386 c Total rapidity for the interaction (for one hard block)
4387           YI=DLOG(SI)
4388           IF(YI.GT.17.D0)YI=17.D0
4389 c Rejection function normalization (on maximal available energy)
4390           GBH0=GBH0/PSRJINT(YI,Z,IQQ)
4391           GBH0 = GBH0/xdiv
4392 5         CONTINUE
4393         IF(DEBUG.GE.3)WRITE (MONIOU,213)
4394 213     FORMAT(2X,'PSSHARE: GBH-INI - END')
4395 c-------------------------------------------------
4396 c End of rejection function normalization
4397 c-------------------------------------------------
4398 
4399 c-------------------------------------------------
4400 c LHA0(i), LHB0(j) arrays are used for energy sharing procedure
4401 c (they define number of remained cut hard blocks connected to given nucleon from
4402 c projectile or target respectively);
4403 c WP, WM - arrays for the rest of light cone momenta (E+-P_l) for those
4404 c nucleons (hadrons)
4405 c Hard pomerons connected to valence quarks are excluded from LHA0(i), LHB0(j)
4406 c (to be considered separetely)
4407 6         DO 7 I=1,NW
4408           LHA0(I)=LHA(I)-LVA(I)
4409 7         WP(I)=WP0
4410 
4411           DO 8 I=1,NT
4412           LHB0(I)=LHB(I)-LVB(I)
4413 8         WM(I)=WM0
4414 
4415 c-------------------------------------------------
4416 c Projectile valence quarks light cone momenta are choosen according to
4417 c 1/sqrt(x) * x**delh * (1-x)**AHV(ICZ), ICZ is the type of the projectile
4418           DO 10 I=1,NW
4419           IF(LVA(I).NE.0)THEN
4420 9           XW=PSRAN(B10)**(1.D0/(.5D0+DELH))
4421             IF(PSRAN(B10).GT.(1.D0-XW)**AHV(ICZ))GOTO 9
4422         IF(DEBUG.GE.3)WRITE (MONIOU,214)I,XW
4423 214     FORMAT(2X,'PSSHARE: ',I2,'-TH PROJ. NUCLEON (HADRON); LIGHT',
4424      *  ' CONE MOMENTUM SHARE XW=',E10.3)
4425 c WP0H(i) -  valence quark light cone momentum for i-th projectile nucleon
4426             WP0H(I)=XW*WP(I)
4427 c WP(i) - the remainder of the light cone momentum for i-th projectile nucleon
4428             WP(I)=WP(I)*(1.D0-XW)
4429           ENDIF
4430 10        CONTINUE
4431 
4432 c Target valence quarks light cone momenta are choosen according to
4433 c 1/sqrt(x) * x**delh * (1-x)**AHV(2) (target nucleon)
4434           DO 12 I=1,NT
4435           IF(LVB(I).NE.0)THEN
4436 11          XW=PSRAN(B10)**(1.D0/(.5D0+DELH))
4437             IF(PSRAN(B10).GT.(1.D0-XW)**AHV(2))GOTO 11
4438         IF(DEBUG.GE.3)WRITE (MONIOU,215)I,XW
4439 215     FORMAT(2X,'PSSHARE: ',I2,'-TH TARGET NUCLEON (HADRON); LIGHT',
4440      *  ' CONE MOMENTUM SHARE XW=',E10.3)
4441 c WM0H(i) -  valence quark light cone momentum for i-th target nucleon
4442             WM0H(I)=XW*WM(I)
4443 c WM(i) - the remainder of the light cone momentum for i-th target nucleon
4444             WM(I)=WM(I)*(1.D0-XW)
4445           ENDIF
4446 12        CONTINUE
4447 c-------------------------------------------------
4448 
4449           GBH=GBH0
4450 c-------------------------------------------------
4451 c Cycle over all cut hard blocks
4452 c-------------------------------------------------
4453           DO 18 IH=1,NHP1
4454 c-------------------------------------------------
4455 c IAH(ih) (IBH(ih)) - number (position in array) of the projectile (target) nucleon,
4456 c connected to ih-th hard block;
4457 c ZH(ih) - factor exp(-R_ij/R_p) for ih-th hard block;
4458 c IQH(ih) - type of the hard interaction: 0 - gg, 1 - qg, 2 - gq, 3 - qq
4459           IQQ=IQH(IH)
4460           Z=ZH(IH)
4461           I=IAH(IH)
4462           J=IBH(IH)
4463 
4464           IF((IQQ-3)*(IQQ-1).EQ.0)THEN
4465 c WHA(ih) - light cone momentum (E+P_l) for ih-th hard block
4466 c Read out of the valence quark light cone momentum
4467             WHA(IH)=WP0H(I)
4468           ELSE
4469 c LHA0(i) - number of remained cut hard blocks connected to i-th projectile nucleon
4470             LHA0(I)=LHA0(I)-1
4471 c Energy is shared between pomerons according to s**DEL dependence for soft
4472 c pomeron and according to s**DELH dependence for the hard block;
4473 c AHL(ICZ) determines energetic spectrum of the leading hadronic state of
4474 c type ICZ
4475             BPI=1.D0/(1.D0+AHL(ICZ)+
4476      *      (1.D0+DELH)*LHA0(I))
4477 c            BPI=1.D0/(1.D0+AHL(ICZ)+(1.D0+DEL)*LQA(I)+
4478 c     *      (1.D0+DELH)*LHA0(I))
4479 15          XW=1.-PSRAN(B10)**BPI
4480 c Rejection according to XW**DELH
4481             IF(PSRAN(B10).GT.XW**DELH)GOTO 15
4482 c WHA(ih) - light cone momentum (E+P_l) for ih-th hard block
4483             WHA(IH)=WP(I)*XW
4484 c WP(i) - the remainder of the light cone momentum for i-th projectile nucleon
4485             WP(I)=WP(I)*(1.D0-XW)
4486           ENDIF
4487 
4488           IF((IQQ-3)*(IQQ-2).EQ.0)THEN
4489 c WHB(ih) - light cone momentum (E-P_l) for ih-th hard block
4490 c Read out of the valence quark light cone momentum
4491             WHB(IH)=WM0H(J)
4492           ELSE
4493 c Energy is shared between pomerons - in the same way as above
4494             LHB0(J)=LHB0(J)-1
4495             BPI=1.D0/(1.D0+AHL(2)+(1.D0+DELH)
4496      *      *LHB0(J))
4497 c            BPI=1.D0/(1.D0+AHL(2)+(1.D0+DEL)*LQB(J)+(1.D0+DELH)
4498 c     *      *LHB0(J))
4499 16          XW=1.-PSRAN(B10)**BPI
4500             IF(PSRAN(B10).GT.XW**DELH)GOTO 16
4501 c WHB(ih) - light cone momentum (E-P_l) for ih-th hard block
4502             WHB(IH)=WM(J)*XW
4503 c WM(j) - the remainder of the light cone momentum for j-th target nucleon
4504             WM(J)=WM(J)*(1.D0-XW)
4505           ENDIF
4506 
4507 c Invariant mass for ih-th hard block
4508           SW=WHA(IH)*WHB(IH)
4509           IF(SW.LT.4.D0*(QT0+AMJ0))THEN
4510 c Rejection in case of insufficient mass
4511             NREJ=NREJ+1
4512 
4513             IF(NREJ.GT.30)THEN
4514 c-------------------------------------------------
4515 c In case of great number of rejections number of hard blocks is put down
4516 c-------------------------------------------------
4517 c Number of remained hard blocks
4518               NHP=NHP-1
4519               LHA(I)=LHA(I)-1
4520               LHB(J)=LHB(J)-1
4521 
4522               IF(IQQ.EQ.1)THEN
4523                 LVA(I)=0
4524               ELSEIF(IQQ.EQ.2)THEN
4525                 LVB(J)=0
4526               ELSEIF(IQQ.EQ.3)THEN
4527                 LVA(I)=0
4528                 LVB(J)=0
4529               ENDIF
4530 
4531               IF(NHP.GE.IH)THEN
4532                 DO 17 IH1=IH,NHP
4533                 IQH(IH1)=IQH(IH1+1)
4534                 ZH(IH1)=ZH(IH1+1)
4535                 IAH(IH1)=IAH(IH1+1)
4536 17              IBH(IH1)=IBH(IH1+1)
4537               ENDIF
4538               GOTO 3
4539 c-------------------------------------------------
4540 c End of removing - event will be simulated from the very beginning
4541 c-------------------------------------------------
4542 
4543             ELSE
4544               GOTO 6
4545             ENDIF
4546           ENDIF
4547         IF(DEBUG.GE.3)WRITE (MONIOU,216)IH,WHA(IH),WHB(IH),WP(I),WM(J)
4548 216     FORMAT(2X,'PSSHARE: ',I3,'-TH SEMIHARD BLOCK; LIGHT',
4549      *  ' CONE MOMENTA SHARES:',2E10.3/
4550      *  4X,'REMAINED LIGHT CONE MOMENTA:',2E10.3)
4551 
4552           YH=DLOG(SW)
4553 c PSRINT(YH,Z,IQQ) - phi_hard(s_hard) / s_hard ** DELH;
4554 c YH = ln s_hard;
4555 c Z - factor exp(-R_ij/R_p) for the hard block;
4556 c IQQ - type of the hard interaction: 0 - gg, 1 - qg, 2 - gq, 3 - qq
4557 c Rejection function is multiplied by PSRINT(YH,Z,IQQ) for the ih-th block
4558           GBH=GBH*PSRJINT(YH,Z,IQQ)
4559           GBH = GBH * xdiv
4560 18        CONTINUE
4561 c End of the loop for rejection function determination
4562 c-------------------------------------------------
4563 
4564 c-------------------------------------------------
4565 c Rejection procedure (due to the deviation of the  phi_hard(s_hard)
4566 c dependence from pure powerlike  s_hard ** DELH law)
4567         IF(DEBUG.GE.2)WRITE (MONIOU,217)1.D0-GBH,NHP
4568 217     FORMAT(2X,'PSSHARE: REJECTION PROBABILITY:',E10.3,
4569      *  2X,'NUMBER OF SEMIHARD BLOCKS:',I3)
4570           IF(PSRAN(B10).GT.GBH)THEN
4571             NREJ=NREJ+1
4572 
4573             IF(NREJ.GT.30)THEN
4574         IF(DEBUG.GE.2)WRITE (MONIOU,218)
4575 218     FORMAT(2X,'PSSHARE: MORE THAN 30 REJECTIONS - HARD POMERON',
4576      *  ' NUMBER IS PUT DOWN')
4577 c-------------------------------------------------
4578 c In case of great number of rejections number of hard blocks is put down
4579 c LNH - number of hard blocks to be removed
4580 c-------------------------------------------------
4581               LNH=1+NHP/20
4582               DO 19 IHP=NHP-LNH+1,NHP
4583               IIH=IAH(IHP)
4584               JIH=IBH(IHP)
4585               IQQ=IQH(IHP)
4586 
4587               IF(IQQ.EQ.1)THEN
4588                 LVA(IIH)=0
4589               ELSEIF(IQQ.EQ.2)THEN
4590                 LVB(JIH)=0
4591               ELSEIF(IQQ.EQ.3)THEN
4592                 LVA(IIH)=0
4593                 LVB(JIH)=0
4594               ENDIF
4595 
4596               LHA(IIH)=LHA(IIH)-1
4597 19            LHB(JIH)=LHB(JIH)-1
4598 
4599               NHP=NHP-LNH
4600               GOTO 3
4601 c-------------------------------------------------
4602 c End of removing - event will be simulated from the very beginning
4603 c-------------------------------------------------
4604             ELSE
4605               GOTO 6
4606             ENDIF
4607           ENDIF
4608 
4609 ***********************************************************************
4610           DO 31 I=1,NW
4611 31        LHA0(I)=LHA(I)
4612           DO 32 I=1,NT
4613 32        LHB0(I)=LHB(I)
4614 ***********************************************************************
4615 
4616 c-------------------------------------------------
4617 c Particle production for all cut pomerons with hard blocks
4618 c-------------------------------------------------
4619           DO 20 IH=1,NHP
4620           IQQ=IQH(IH)
4621           Z=ZH(IH)
4622           I=IAH(IH)
4623           J=IBH(IH)
4624 ***********************************************************************
4625           LHA0(I)=LHA0(I)-1
4626           LHB0(J)=LHB0(J)-1
4627 ***********************************************************************
4628 c WPI, WMI - light cone momenta for current (ih-th) hard pomeron
4629           WPI=WHA(IH)
4630           WMI=WHB(IH)
4631         IF(DEBUG.GE.2)WRITE (MONIOU,219)IH,IQQ,WPI,WMI,WP(I),WM(J)
4632 219     FORMAT(2X,'PSSHARE: ',I3,
4633      *  '-TH HARD BLOCK; TYPE OF THE INTERACTION:',I1/
4634      *  4X,'INITIAL LIGHT CONE MOMENTA:',2E10.3/
4635      *  4X,'REMAINED LIGHT CONE MOMENTA:',2E10.3)
4636 c-------------------------------------------------
4637 c PSHOT procedure is used for hard partonic interaction -
4638 c initial jets simulation
4639           CALL PSHOT(WPI,WMI,Z,IPC,EPC,IZP(I),IZT(J),ICZ,IQQ)
4640           IF(IQQ.EQ.1.OR.IQQ.EQ.3)THEN
4641             IF((IABS(IZP(I)).GT.5.OR.IABS(IZP(I)).EQ.3).AND.
4642      *      IZP(I).GT.0.OR.IABS(IZP(I)).NE.3.AND.
4643      *      IABS(IZP(I)).LE.5.AND.IZP(I).LT.0)THEN
4644               JQ=1
4645             ELSE
4646               JQ=2
4647             ENDIF
4648             ILA(I)=IPC(JQ,1)
4649             DO 330 L=1,4
4650 330         ELA(L,I)=EPC(L+4*(JQ-1),1)
4651           ENDIF
4652           IF(IQQ.EQ.2.OR.IQQ.EQ.3)THEN
4653             IF((IABS(IZT(J)).GT.5.OR.IABS(IZT(J)).EQ.3).AND.
4654      *      IZT(J).GT.0.OR.IABS(IZT(J)).NE.3.AND.
4655      *      IABS(IZT(J)).LE.5.AND.IZT(J).LT.0)THEN
4656               JQ=1
4657             ELSE
4658               JQ=2
4659             ENDIF
4660             ILB(J)=IPC(JQ,2)
4661             DO 331 L=1,4
4662 331         ELB(L,J)=EPC(L+4*(JQ-1),2)
4663           ENDIF
4664           IF(IQQ.EQ.3.AND.ILA(I)+ILB(J).EQ.0)NIAS=J
4665 c-------------------------------------------------
4666 c          SW=WP(I)*WM(J)
4667 c          IF(WP(I).LT.0.D0.OR.WM(J).LT.0.D0.OR.
4668 c     *    SW.LT.(AM(ICZ)+AM(2))**2)THEN
4669 c            NREJ=NREJ+1
4670 c          write (*,*)'i,j,WP(I),WM(J),sw',i,j,WP(I),WM(J),sw
4671 c            GOTO 100
4672 c          ENDIF
4673 
4674 c Leading hadronic state fragmentation is treated in the same way as low mass
4675 c diffraction (exhitation mass is determined by secodary reggeon intercept
4676 c dM**2~M**(-3))
4677           IF(LQA(I)+LHA0(I).EQ.0.AND.LQB(J)+LHB0(J).EQ.0)THEN
4678             IF(LVA(I).EQ.0.AND.LVB(J).EQ.0)THEN
4679               CALL XXDDFR(WP(I),WM(J),IZP(I),IZT(J))
4680             ELSEIF(LVA(I).EQ.0)THEN
4681               CALL XXDPR(WP(I),WM(J),IZP(I),IZT(J),1)
4682               IF(ILB(J).NE.0)THEN
4683                 DO 341 L=1,4
4684 341             EP1(L)=ELB(L,J)
4685                 EP(1)=.5D0*WM(J)
4686                 EP(2)=-EP(1)
4687                 EP(3)=0.D0
4688                 EP(4)=0.D0
4689                 IPJ1=ILB(J)
4690                 IF(IABS(IPJ1).EQ.3)IPJ1=IPJ1*4/3
4691                 CALL PSJDEF(IZT(J),IPJ1,EP,EP1,JFL)
4692                 IF(JFL.EQ.0)GOTO 100
4693               ENDIF
4694             ELSEIF(LVB(J).EQ.0)THEN
4695               CALL XXDTG(WP(I),WM(J),IZP(I),IZT(J),1)
4696               IF(ILA(I).NE.0)THEN
4697                 DO 342 L=1,4
4698 342             EP1(L)=ELA(L,I)
4699                 EP(1)=.5D0*WP(I)
4700                 EP(2)=EP(1)
4701                 EP(3)=0.D0
4702                 EP(4)=0.D0
4703                 IPJ1=ILA(I)
4704                 IF(IABS(IPJ1).EQ.3)IPJ1=IPJ1*4/3
4705                 CALL PSJDEF(IZP(I),IPJ1,EP,EP1,JFL)
4706                 IF(JFL.EQ.0)GOTO 100
4707               ENDIF
4708             ELSE
4709               IF(ILA(I).NE.0)THEN
4710                 DO 343 L=1,4
4711 343             EP1(L)=ELA(L,I)
4712                 EP(1)=.5D0*WP(I)
4713                 EP(2)=EP(1)
4714                 EP(3)=0.D0
4715                 EP(4)=0.D0
4716                 IPJ1=ILA(I)
4717                 IF(IABS(IPJ1).EQ.3)IPJ1=IPJ1*4/3
4718                 CALL PSJDEF(IZP(I),IPJ1,EP,EP1,JFL)
4719                 IF(JFL.EQ.0)GOTO 100
4720               ENDIF
4721               IF(ILB(J).NE.0)THEN
4722                 DO 351 L=1,4
4723 351             EP1(L)=ELB(L,J)
4724                 EP(1)=.5D0*WM(J)
4725                 EP(2)=-EP(1)
4726                 EP(3)=0.D0
4727                 EP(4)=0.D0
4728                 IPJ1=ILB(J)
4729                 IF(IABS(IPJ1).EQ.3)IPJ1=IPJ1*4/3
4730                 CALL PSJDEF(IZT(J),IPJ1,EP,EP1,JFL)
4731                 IF(JFL.EQ.0)GOTO 100
4732               ENDIF
4733             ENDIF
4734           ELSEIF(LQA(I)+LHA0(I).EQ.0)THEN
4735             IF(LVA(I).EQ.0)THEN
4736               CALL XXDPR(WP(I),WM(J),IZP(I),IZT(J),LQB(J)+LHB0(J))
4737             ELSE
4738               IF(ILA(I).NE.0)THEN
4739                 DO 344 L=1,4
4740 344             EP1(L)=ELA(L,I)
4741                 EP(1)=.5D0*WP(I)
4742                 EP(2)=EP(1)
4743                 EP(3)=0.D0
4744                 EP(4)=0.D0
4745                 IPJ1=ILA(I)
4746                 IF(IABS(IPJ1).EQ.3)IPJ1=IPJ1*4/3
4747                 CALL PSJDEF(IZP(I),IPJ1,EP,EP1,JFL)
4748                 IF(JFL.EQ.0)GOTO 100
4749               ENDIF
4750             ENDIF
4751           ELSEIF(LQB(J)+LHB0(J).EQ.0)THEN
4752             IF(LVB(J).EQ.0)THEN
4753               CALL XXDTG(WP(I),WM(J),IZP(I),IZT(J),LQA(I)+LHA0(I))
4754             ELSE
4755               IF(ILB(J).NE.0)THEN
4756                 DO 345 L=1,4
4757 345             EP1(L)=ELB(L,J)
4758                 EP(1)=.5D0*WM(J)
4759                 EP(2)=-EP(1)
4760                 EP(3)=0.D0
4761                 EP(4)=0.D0
4762                 IPJ1=ILB(J)
4763                 IF(IABS(IPJ1).EQ.3)IPJ1=IPJ1*4/3
4764                 CALL PSJDEF(IZT(J),IPJ1,EP,EP1,JFL)
4765                 IF(JFL.EQ.0)GOTO 100
4766               ENDIF
4767             ENDIF
4768           ENDIF
4769 cxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
4770 20        CONTINUE
4771 c-------------------------------------------------
4772 c End of the hard blocks loop
4773 c-------------------------------------------------
4774 
4775         ELSE
4776 c-------------------------------------------------
4777 c Initial light cone momenta initialization in case of no one cut hard block
4778           DO 21 I=1,NW
4779 21        WP(I)=WP0
4780           DO 22 I=1,NT
4781 22        WM(I)=WM0
4782         ENDIF
4783 
4784         IF(LS.NE.0)THEN
4785 c-------------------------------------------------
4786 c The loop for all cut froissarons (blocks of soft pomerons)
4787 c-------------------------------------------------
4788           DO 28 IS=1,LS
4789 c NP=NQS(is) - number of cut pomerons in is-th block;
4790 c IAS(is) (IBS(is)) - number (position in array) of the projectile (target) nucleon,
4791 c connected to is-th block of soft pomerons;
4792 c LQA(i) (LQB(j)) - total number of cut soft pomerons, connected to i-th projectile
4793 c (j-th target) nucleon (hadron);
4794 c WP(i) (WM(j)) - the remainder of the light cone momentum for i-th projectile
4795 c (j-th target) nucleon (hadron);
4796 c NP=NQS(is) - number of cut pomerons in is-th block;
4797 c LQ1, LQ2 define the numbers of the remained cut pomerons  connected
4798 c to given nucleons (hadrons)
4799           I=IAS(IS)
4800           J=IBS(IS)
4801           LQ1=LQA(I)
4802           LQ2=LQB(J)
4803           WPN=WP(I)
4804           WMN=WM(J)
4805           NP=NQS(IS)
4806       IF(DEBUG.GE.3)WRITE (MONIOU,222)IS,I,J,NP
4807 222   FORMAT(2X,'PSSHARE: ',I3,'-TH SOFT POMERON BLOCK IS',
4808      *      ' CONNECTED TO ',I2,
4809      *      '-TH PROJECTILE NUCLEON'/4x,'(HADRON) AND ',I2,
4810      *      '-TH TARGET NUCLEON'/
4811      *      4X,'NUMBER OF CUT SOFT POMERONS IN THE BLOCK:',I2)
4812 c-------------------------------------------------
4813 c The loop for all cut pomerons in the block
4814           DO 27 IP=1,NP
4815 
4816 cxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
4817 c High mass diffraction - probability WPPP
4818 14        JPP=0
4819 cdh       IF(LQ1.EQ.1.AND.WPN.EQ.WP0.AND.PSRAN(B10).LT.WPPP)THEN
4820           IF(LQ1.EQ.1.AND.WPN.EQ.WP0.AND.PSRAN(B10).LT.WPPP
4821      *    .AND.LVB(J).EQ.0)THEN    !!!!!!!!!!!!!!!!!!so-07.03.99
4822 c In case of only one cut soft pomeron high mass diffraction is simulated with the
4823 c probability WPPP/2 or triple pomeron contribution - also WPPP/2 to have AGK cancell.
4824 c - only for projectile hadron (nucleons) (for target - neglected)
4825 c YW is the branching point position (in rapidity)
4826             YW=1.D0+PSRAN(B10)*(Y0-2.D0)
4827       IF(DEBUG.GE.3)WRITE (MONIOU,223)YW
4828 223   FORMAT(2X,'PSSHARE: TRIPLE POMERON CONTRIBUTION YW=',E10.3)
4829 c Light cone momentum (E+P_l) for the diffractive state (which is just usual cut
4830 c pomeron)
4831             XPW=EXP(-YW)
4832             JPP=1
4833 cxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
4834 
4835           ELSE
4836             LQ1=LQ1-1
4837 c Energy-momentum is shared between pomerons according to s**DEL dependence for soft
4838 c pomeron; AHL(ICZ) determines energy spectrum of leading hadronic
4839 c state of type ICZ
4840             BPI=1.D0/(1.D0+AHL(ICZ)+(1.D0+DEL)*LQ1)
4841 23          XPW=1.-PSRAN(B10)**BPI
4842 c Rejection according to XW**DEL
4843             IF(PSRAN(B10).GT.XPW**DEL)GOTO 23
4844           ENDIF
4845 
4846           LQ2=LQ2-1
4847 c Energy-momentum is shared between pomerons according to s**DEL dependence for soft
4848 c pomeron - similar to projectile case
4849           BPI=1.D0/(1.D0+AHL(2)+(1.D0+DEL)*LQ2)
4850 24        XMW=1.-PSRAN(B10)**BPI
4851 c Rejection according to XW**DEL
4852           IF(PSRAN(B10).GT.XMW**DEL)GOTO 24
4853 c-------------------------------------------------
4854 
4855 cxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
4856 c High mass diffraction is rejected in case of insufficient energy
4857          IF(JPP.EQ.1.AND.XPW*XMW*WPN*WMN.LT.2.72D0)THEN
4858             LQ2=LQ2+1
4859             GOTO 14
4860           ENDIF
4861 cxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
4862 
4863 c WPI is the light cone momentum (E+P_l) for the pomeron;
4864 c WPN is the remainder of the light cone momentum for given nucleon (hadron)
4865           WPI=WPN*XPW
4866           WPN=WPN-WPI
4867           WMI=WMN*XMW
4868           WMN=WMN-WMI
4869 
4870 ************************************************************************
4871 cxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
4872         IF(LQ1.EQ.0.AND.LVA(I).EQ.0)THEN
4873           CALL IXXDEF(IZP(I),IC11,IC12,ICZ)
4874         ELSE
4875           IC11=0
4876           IC12=0
4877         ENDIF
4878         IF(LQ2.EQ.0.AND.LVB(J).EQ.0)THEN
4879           CALL IXXDEF(IZT(J),IC21,IC22,2)
4880         ELSE
4881           IC21=0
4882           IC22=0
4883         ENDIF
4884 
4885 cxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
4886 c Fragmentation process for the pomeron ( quarks and antiquarks types at the
4887 c ends of the two strings are determined, energy-momentum is shared
4888 c between them and strings fragmentation is simulated )
4889       IF(DEBUG.GE.3)WRITE (MONIOU,224)IP,WPI,WMI
4890 224   FORMAT(2X,'PSSHARE: ',I2,'-TH SOFT POMERON IN THE BLOCK'/
4891      *      4X,'LIGHT CONE MOMENTA FOR THE POMERON:',2E10.3)
4892           CALL XXSTR(WPI,WMI,WPN,WMN,IC11,IC12,IC22,IC21)
4893 cxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
4894 
4895 cxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
4896 c Triple pomeron contribution simulation
4897           IF(JPP.EQ.1)THEN
4898             IF(PSRAN(B10).LT..5D0)THEN
4899               SW=WPN*WMN
4900               IF(WPN.LT.0.D0.OR.WMN.LT.0.D0.OR.
4901      *        SW.LT.(AM(ICZ)+AM(2))**2)THEN
4902 cdh
4903                 if (debug.ge.1)
4904      *            write (*,*)'difr,i,j,WPn,WMn,sw,lq1,lq2',
4905      *                             i,j,WPn,WMn,sw,lq1,lq2
4906                 NREJ=NREJ+1
4907                 GOTO 100
4908               ENDIF
4909               typevt=3       !high mass diffraction
4910 
4911               IF(LQ2.EQ.0)THEN
4912                 CALL XXDTG(WPN,WMN,IZP(I),IZT(J),0)
4913               ELSE
4914                 WP1=WPN
4915                 WM1=AM(ICZ)**2/WP1
4916                 EP3(1)=.5D0*(WP1+WM1)
4917                 EP3(2)=.5D0*(WP1-WM1)
4918                 EP3(3)=0.D0
4919                 EP3(4)=0.D0
4920                 CALL XXREG(EP3,IZP(I))
4921                 WMN=WMN-WM1
4922                 WPN=0.D0
4923               ENDIF
4924               GOTO 30
4925             ELSE
4926 
4927 c Triple pomeron contribution simulation (both pomerons are cut)
4928       IF(DEBUG.GE.3)WRITE (MONIOU,225)
4929 225   FORMAT(2X,'PSSHARE: TRIPLE POMERON CONRITRIBUTION WITH 3 CUT',
4930      *' POMERONS')
4931               WMM(1)=1.D0/WPI
4932               WMN=WMN-WMM(1)
4933 c Light cone momentum (E-P_l) sharing for the two pomerons
4934               WMM(2)=WMM(1)*PSRAN(B10)
4935               WMM(1)=WMM(1)-WMM(2)
4936               LQ1=2
4937               DO 26 L=1,2
4938               LQ1=LQ1-1
4939 c Light cone momentum (E+P_l) sharing for the two pomerons
4940               BPI=(1.D0+DEL)*LQ1+1.D0+AHL(ICZ)
4941               BPI=1.D0/BPI
4942 25            XPW=1.-PSRAN(B10)**BPI
4943               IF(PSRAN(B10).GT.XPW**DEL)GOTO 25
4944               WPP(L)=WPN*XPW
4945               WPN=WPN*(1.D0-XPW)
4946 c Fragmentation process for the pomerons
4947 26            CALL XXSTR(WPP(L),WMM(L),WPN,WMN,0,0,0,0)
4948               SW=WPN*WMN
4949               IF(WPN.LT.0.D0.OR.WMN.LT.0.D0.OR.
4950      *        SW.LT.(AM(ICZ)+AM(2))**2)THEN
4951                 NREJ=NREJ+1
4952                 GOTO 100
4953               ENDIF
4954             ENDIF
4955           ENDIF
4956 cxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
4957 27        CONTINUE
4958 c End of the pomeron loop
4959 cxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
4960 c          SW=WPN*WMN
4961 c          IF(WPN.LT.0.D0.OR.WMN.LT.0.D0.OR.
4962 c     *    SW.LT.(AM(ICZ)+AM(2))**2)THEN
4963 c            NREJ=NREJ+1
4964 c            GOTO 100
4965 c          ENDIF
4966 
4967 c Leading hadronic state fragmentation is treated in the same way as low mass
4968 c diffraction (exhitation mass is determined by secodary reggeon intercept
4969 c dM**2~M**(-3))
4970           IF(LQ1.EQ.0.AND.LQ2.EQ.0)THEN
4971             IF(LVA(I).EQ.0.AND.LVB(J).EQ.0)THEN
4972               CALL XXDDFR(WPN,WMN,IZP(I),IZT(J))
4973             ELSEIF(LVA(I).EQ.0)THEN
4974               CALL XXDPR(WPN,WMN,IZP(I),IZT(J),1)
4975               IF(ILB(J).NE.0)THEN
4976                 DO 346 L=1,4
4977 346             EP1(L)=ELB(L,J)
4978                 EP(1)=.5D0*WMN
4979                 EP(2)=-EP(1)
4980                 EP(3)=0.D0
4981                 EP(4)=0.D0
4982                 IPJ1=ILB(J)
4983                 IF(IABS(IPJ1).EQ.3)IPJ1=IPJ1*4/3
4984                 CALL PSJDEF(IZT(J),IPJ1,EP,EP1,JFL)
4985                 IF(JFL.EQ.0)GOTO 100
4986               ENDIF
4987             ELSEIF(LVB(J).EQ.0)THEN
4988               CALL XXDTG(WPN,WMN,IZP(I),IZT(J),1)
4989               IF(ILA(I).NE.0)THEN
4990                 DO 347 L=1,4
4991 347             EP1(L)=ELA(L,I)
4992                 EP(1)=.5D0*WPN
4993                 EP(2)=EP(1)
4994                 EP(3)=0.D0
4995                 EP(4)=0.D0
4996                 IPJ1=ILA(I)
4997                 IF(IABS(IPJ1).EQ.3)IPJ1=IPJ1*4/3
4998                 CALL PSJDEF(IZP(I),IPJ1,EP,EP1,JFL)
4999                IF(JFL.EQ.0)GOTO 100
5000               ENDIF
5001             ELSE
5002               IF(ILA(I).NE.0)THEN
5003                 DO 348 L=1,4
5004 348             EP1(L)=ELA(L,I)
5005                 EP(1)=.5D0*WPN
5006                 EP(2)=EP(1)
5007                 EP(3)=0.D0
5008                 EP(4)=0.D0
5009                 IPJ1=ILA(I)
5010                 IF(IABS(IPJ1).EQ.3)IPJ1=IPJ1*4/3
5011                 CALL PSJDEF(IZP(I),IPJ1,EP,EP1,JFL)
5012                 IF(JFL.EQ.0)GOTO 100
5013               ENDIF
5014               IF(ILB(J).NE.0)THEN
5015                 DO 349 L=1,4
5016 349             EP1(L)=ELB(L,J)
5017                 EP(1)=.5D0*WMN
5018                 EP(2)=-EP(1)
5019                 EP(3)=0.D0
5020                 EP(4)=0.D0
5021                 IPJ1=ILB(J)
5022                 IF(IABS(IPJ1).EQ.3)IPJ1=IPJ1*4/3
5023                 CALL PSJDEF(IZT(J),IPJ1,EP,EP1,JFL)
5024                 IF(JFL.EQ.0)GOTO 100
5025               ENDIF
5026             ENDIF
5027 
5028           ELSEIF(LQ1.EQ.0)THEN
5029             IF(LVA(I).EQ.0)THEN
5030               CALL XXDPR(WPN,WMN,IZP(I),IZT(J),LQ2)
5031             ELSE
5032               IF(ILA(I).NE.0)THEN
5033                 DO 350 L=1,4
5034 350             EP1(L)=ELA(L,I)
5035                 EP(1)=.5D0*WPN
5036                 EP(2)=EP(1)
5037                 EP(3)=0.D0
5038                 EP(4)=0.D0
5039                 IPJ1=ILA(I)
5040                 IF(IABS(IPJ1).EQ.3)IPJ1=IPJ1*4/3
5041                 CALL PSJDEF(IZP(I),IPJ1,EP,EP1,JFL)
5042                 IF(JFL.EQ.0)GOTO 100
5043               ENDIF
5044             ENDIF
5045 
5046           ELSEIF(LQ2.EQ.0)THEN
5047             IF(LVB(J).EQ.0)THEN
5048               CALL XXDTG(WPN,WMN,IZP(I),IZT(J),LQ1)
5049             ELSE
5050               IF(ILB(J).NE.0)THEN
5051                 DO 352 L=1,4
5052 352             EP1(L)=ELB(L,J)
5053                 EP(1)=.5D0*WMN
5054                 EP(2)=-EP(1)
5055                 EP(3)=0.D0
5056                 EP(4)=0.D0
5057                 IPJ1=ILB(J)
5058                 IF(IABS(IPJ1).EQ.3)IPJ1=IPJ1*4/3
5059                 CALL PSJDEF(IZT(J),IPJ1,EP,EP1,JFL)
5060                 IF(JFL.EQ.0)GOTO 100
5061               ENDIF
5062             ENDIF
5063           ENDIF
5064 cxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
5065 c-------------------------------------------------
5066 c The numbers of the remained cut pomerons connected to given nucleons (hadrons)
5067 c as well as the rest of the longitudinal momenta for these nucleons are
5068 c recorded
5069 30        LQA(I)=LQ1
5070           LQB(J)=LQ2
5071           WP(I)=WPN
5072 28        WM(J)=WMN
5073         ENDIF
5074 c-------------------------------------------------
5075 c End of the soft blocks loop
5076 c-------------------------------------------------
5077         IF(IA(1).EQ.1.AND.LVA(1).NE.0.AND.ILA(1).EQ.0)THEN
5078           EP(1)=.5D0*WP(1)
5079           EP(2)=EP(1)
5080           EP(3)=0.D0
5081           EP(4)=0.D0
5082           EP1(1)=.5D0*WM(NIAS)
5083           EP1(2)=-EP1(1)
5084           EP1(3)=0.D0
5085           EP1(4)=0.D0
5086           CALL PSJDEF(IZP(1),IZT(NIAS),EP,EP1,JFL)
5087           IF(JFL.EQ.0)GOTO 100
5088         ENDIF
5089 cxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
5090         CALL XXJETSIM
5091 ************************************************************************
5092       IF(DEBUG.GE.3)WRITE (MONIOU,227)
5093 227   FORMAT(2X,'PSSHARE - END')
5094         RETURN
5095         END
5096 C=======================================================================
5097 
5098       SUBROUTINE QGSPSTRANS(EP,EY)
5099 c Lorentz transform according to parameters EY ( determining Lorentz shift
5100 c along the Z,X,Y-axis respectively (EY(1),EY(2),EY(3)))
5101 c-----------------------------------------------------------------------
5102         IMPLICIT DOUBLE PRECISION (A-H,O-Z)
5103         INTEGER DEBUG
5104         DIMENSION EY(3),EP(4)
5105         COMMON /Q_AREA43/ MONIOU
5106         COMMON /Q_DEBUG/  DEBUG
5107         SAVE
5108 
5109         IF(DEBUG.GE.2)WRITE (MONIOU,201)EP,EY
5110 201     FORMAT(2X,'QGSPSTRANS - LORENTZ BOOST FOR 4-VECTOR'/4X,'EP=',
5111      *  2X,4(E10.3,1X)/4X,'BOOST PARAMETERS EY=',3E10.3)
5112 c Lorentz transform to lab. system according to 1/EY(i) parameters
5113         DO 1 I=1,3
5114         IF(EY(4-I).NE.1.D0)THEN
5115           WP=(EP(1)+EP(5-I))/EY(4-I)
5116           WM=(EP(1)-EP(5-I))*EY(4-I)
5117           EP(1)=.5D0*(WP+WM)
5118           EP(5-I)=.5D0*(WP-WM)
5119         ENDIF
5120 1       CONTINUE
5121         IF(DEBUG.GE.3)WRITE (MONIOU,202)EP
5122 202     FORMAT(2X,'QGSPSTRANS: TRANSFORMED 4-VECTOR EP=',
5123      *  2X,4(E10.3,1X))
5124         RETURN
5125         END
5126 C=======================================================================
5127 
5128       SUBROUTINE QGSPSTRANS1(EP,EY)
5129 c Lorentz transform according to parameters EY ( determining Lorentz shift
5130 c along the Z,X,Y-axis respectively (EY(1),EY(2),EY(3)))
5131 c-----------------------------------------------------------------------
5132         IMPLICIT DOUBLE PRECISION (A-H,O-Z)
5133         INTEGER DEBUG
5134         DIMENSION EY(3),EP(4)
5135         COMMON /Q_AREA43/ MONIOU
5136         COMMON /Q_DEBUG/  DEBUG
5137         SAVE
5138 
5139         IF(DEBUG.GE.2)WRITE (MONIOU,201)EP,EY
5140 201     FORMAT(2X,'QGSPSTRANS1 - LORENTZ BOOST FOR 4-VECTOR'/4X,'EP=',
5141      *  2X,4(E10.3,1X)/4X,'BOOST PARAMETERS EY=',3E10.3)
5142 c Lorentz transform to lab. system according to 1/EY(i) parameters
5143           DO 2 I=1,3
5144           IF(EY(I).NE.1.D0)THEN
5145             WP=(EP(1)+EP(I+1))*EY(I)
5146             WM=(EP(1)-EP(I+1))/EY(I)
5147             EP(1)=.5D0*(WP+WM)
5148             EP(I+1)=.5D0*(WP-WM)
5149           ENDIF
5150 2         CONTINUE
5151         IF(DEBUG.GE.3)WRITE (MONIOU,202)EP
5152 202     FORMAT(2X,'QGSPSTRANS1: TRANSFORMED 4-VECTOR EP=',
5153      *  2X,4(E10.3,1X))
5154         RETURN
5155         END
5156 C=======================================================================
5157 
5158         FUNCTION PSUDINT(QLMAX,J)
5159 c PSUDINT - timelike Sudakov formfactor interpolation
5160 c QLMAX - ln QMAX/16/QTF,
5161 c J - type of the parton (0-g,1-q)
5162 c-----------------------------------------------------------------------
5163         IMPLICIT DOUBLE PRECISION (A-H,O-Z)
5164         INTEGER DEBUG
5165         DIMENSION WK(3)
5166         COMMON /Q_AREA33/ FSUD(10,2)
5167         COMMON /Q_AREA43/ MONIOU
5168         COMMON /Q_DEBUG/  DEBUG
5169         SAVE
5170 
5171         IF(DEBUG.GE.2)WRITE (MONIOU,201)J,QLMAX
5172 201     FORMAT(2X,'PSUDINT - SPACELIKE FORM FACTOR INTERPOLATION:'/
5173      *  4X,'PARTON TYPE J=',
5174      *  I1,2X,'MOMENTUM LOGARITHM QLMAX=',E10.3)
5175         QL=QLMAX/1.38629d0
5176 
5177         IF(QL.LE.0.D0)THEN
5178           PSUDINT=1.D0
5179         ELSE
5180           K=INT(QL)
5181           IF(K.GT.7)K=7
5182           WK(2)=QL-K
5183           WK(3)=WK(2)*(WK(2)-1.D0)*.5D0
5184           WK(1)=1.D0-WK(2)+WK(3)
5185           WK(2)=WK(2)-2.D0*WK(3)
5186 
5187           PSUDINT=0.D0
5188           DO 1 K1=1,3
5189 1         PSUDINT=PSUDINT+FSUD(K+K1,J)*WK(K1)
5190           IF(PSUDINT.LE.0.D0)PSUDINT=0.D0
5191           PSUDINT=EXP(-PSUDINT)
5192         ENDIF
5193         IF(DEBUG.GE.3)WRITE (MONIOU,202)PSUDINT
5194 202     FORMAT(2X,'PSUDINT=',E10.3)
5195         RETURN
5196         END
5197 C=======================================================================
5198 
5199         FUNCTION QGSPSUDS(Q,J)
5200 c QGSPSUDS - spacelike Sudakov formfactor
5201 c Q - maximal value of the effective momentum,
5202 c J - type of parton (0 - g, 1 - q)
5203 c-----------------------------------------------------------------------
5204         IMPLICIT DOUBLE PRECISION (A-H,O-Z)
5205         INTEGER DEBUG
5206         COMMON /Q_AREA6/  PI,BM,AM
5207         COMMON /Q_AREA18/ ALM,QT0,QLOG,QLL,AQT0,QTF,BET,AMJ0
5208         COMMON /Q_AREA43/ MONIOU
5209         COMMON /Q_DEBUG/  DEBUG
5210         SAVE
5211 
5212         IF(DEBUG.GE.2)WRITE (MONIOU,201)J,Q
5213 201     FORMAT(2X,'QGSPSUDS - SPACELIKE FORM FACTOR: PARTON TYPE J=',
5214      *  I1,2X,'MOMENTUM Q=',E10.3)
5215         IF(Q.GT.QT0)THEN
5216           QLM=DLOG(Q/ALM)
5217           QGSPSUDS=(QLM*DLOG(QLM/QLOG)-DLOG(Q/QT0))/9.D0
5218 
5219           IF(J.EQ.0)THEN
5220             QGSPSUDS=QGSPSUDS*6.D0
5221           ELSE
5222             QGSPSUDS=QGSPSUDS/.375D0
5223           ENDIF
5224           QGSPSUDS=EXP(-QGSPSUDS)
5225 
5226         ELSE
5227           QGSPSUDS=1.D0
5228         ENDIF
5229         IF(DEBUG.GE.3)WRITE (MONIOU,202)QGSPSUDS
5230 202     FORMAT(2X,'QGSPSUDS=',E10.3)
5231         RETURN
5232         END
5233 C=======================================================================
5234 
5235         FUNCTION PSUDT(QMAX,J)
5236 c PSUDT - timelike Sudakov formfactor
5237 c QMAX - maximal value of the effective momentum,
5238 c J - type of parton (0 - g, 1 - q)
5239 c-----------------------------------------------------------------------
5240         IMPLICIT DOUBLE PRECISION (A-H,O-Z)
5241         INTEGER DEBUG
5242         COMMON /Q_AREA18/ ALM,QT0,QLOG,QLL,AQT0,QTF,BET,AMJ0
5243         COMMON/AR13/X1(7),A1(7)
5244         COMMON /Q_AREA43/ MONIOU
5245         COMMON /Q_DEBUG/  DEBUG
5246         SAVE
5247 
5248         IF(DEBUG.GE.2)WRITE (MONIOU,201)J,QMAX
5249 201     FORMAT(2X,'PSUDT - TIMELIKE FORM FACTOR: PARTON TYPE J=',
5250      *  I1,2X,'MOMENTUM QMAX=',E10.3)
5251         PSUDT=0.D0
5252         QLMAX=DLOG(DLOG(QMAX/16.D0/ALM))
5253         QFL=DLOG(DLOG(QTF/ALM))
5254 
5255 c Numerical integration over transverse momentum square;
5256 c Gaussian integration is used
5257           DO 1 I=1,7
5258           DO 1 M=1,2
5259           QTL=.5D0*(QLMAX+QFL+(2*M-3)*X1(I)*(QLMAX-QFL))
5260           QT=ALM*EXP(EXP(QTL))
5261           IF(QT.GE.QMAX/16.D0)QT=QMAX/16.0001D0
5262           ZMIN=.5D0-DSQRT((.25D0-DSQRT(QT/QMAX)))
5263           ZMAX=1.D0-ZMIN
5264           IF(J.EQ.0)THEN
5265 ******************************************************
5266             AP=(PSAPINT(ZMAX,0,0)-PSAPINT(ZMIN,0,0)+
5267      *      PSAPINT(ZMAX,0,1)-PSAPINT(ZMIN,0,1))*.5D0
5268 ******************************************************
5269           ELSE
5270             AP=PSAPINT(ZMAX,1,0)-PSAPINT(ZMIN,1,0)
5271           ENDIF
5272 1         PSUDT=PSUDT+A1(I)*AP
5273           PSUDT=PSUDT*(QLMAX-QFL)/9.D0
5274         IF(DEBUG.GE.3)WRITE (MONIOU,202)PSUDT
5275 202     FORMAT(2X,'PSUDT=',E10.3)
5276         RETURN
5277         END
5278 C=======================================================================
5279 
5280         FUNCTION PSV(X,Y,XB,IB)
5281 c XXV - eikonal dependent factor for hadron-nucleus interaction
5282 c (used for total and diffractive hadron-nucleus cross-sections calculation)
5283 c-----------------------------------------------------------------------
5284         IMPLICIT DOUBLE PRECISION (A-H,O-Z)
5285         INTEGER DEBUG
5286 cdh     DIMENSION XB(56,3),FHARD(3)
5287         DIMENSION XB(210,3),FHARD(3)
5288         COMMON /Q_AREA43/ MONIOU
5289         COMMON /Q_DEBUG/  DEBUG
5290         SAVE
5291 
5292         IF(DEBUG.GE.2)WRITE (MONIOU,201)X,Y,IB
5293 201     FORMAT(2X,'PSV - EIKONAL FACTOR: NUCLEON COORDINATES X=',
5294      *  E10.3,2X,'Y=',E10.3/4X,'NUMBER OF ACTIVE TARGET NUCLEONS IB='
5295      *  ,I2)
5296         DV=0.D0
5297 c????????????????????????????????????????????
5298         DO 1 M=1,IB
5299         Z=PSDR(X-XB(M,1),Y-XB(M,2))
5300         DV=DV+PSFAZ(Z,FSOFT,FHARD,FSHARD)+FHARD(1)+FHARD(2)+FHARD(3)
5301 1       CONTINUE
5302         PSV=(1.D0-EXP(-DV))**2
5303 
5304 C       DH=1.D0
5305 C       DO 1 M=1,IB
5306 C       Z=PSDR(X-XB(M,1),Y-XB(M,2))
5307 C       DV=DV+PSFAZ(Z,FSOFT,FHARD,FSHARD)
5308 C 1     DH=DH*(1.D0-FHARD(1)-FHARD(2)-FHARD(3))
5309 c????????????????????????????????????????????????
5310         IF(DEBUG.GE.3)WRITE (MONIOU,202)PSV
5311 202     FORMAT(2X,'PSV=',E10.3)
5312         RETURN
5313         END
5314 C=======================================================================
5315 
5316         SUBROUTINE PSVDEF(ICH,IC1,ICZ)
5317 c Determination of valence quark flavour -
5318 c for valence quark hard scattering
5319 c-----------------------------------------------------------------------
5320         IMPLICIT DOUBLE PRECISION (A-H,O-Z)
5321         INTEGER DEBUG
5322         COMMON /Q_AREA11/ B10
5323         COMMON /Q_AREA43/ MONIOU
5324         COMMON /Q_DEBUG/  DEBUG
5325         SAVE
5326         EXTERNAL PSRAN
5327 
5328         IF(DEBUG.GE.2)WRITE (MONIOU,201)ICH,ICZ
5329 201     FORMAT(2X,'PSVDEF: HADRON TYPE ICH=',I2,' AUXILLIARY TYPE ICZ='
5330      *  ,I1)
5331 
5332         IS=IABS(ICH)/ICH
5333         IF(ICZ.EQ.1)THEN
5334           IC1=ICH*(1-3*INT(.5+PSRAN(B10)))
5335           ICH=-IC1-ICH
5336         ELSEIF(ICZ.EQ.2)THEN
5337           IF(PSRAN(B10).GT..33333D0.OR.ICH.LT.0)THEN
5338             IC1=ICH-IS
5339             ICH=3*IS
5340           ELSE
5341             IC1=4*IS-ICH
5342             ICH=ICH+4*IS
5343           ENDIF
5344         ELSEIF(ICZ.EQ.3)THEN
5345           IC1=ICH-3*IS
5346           ICH=-4*IS
5347         ELSEIF(ICZ.EQ.4)THEN
5348           IC1=ICH-9*IS
5349           ICH=5*IS
5350         ENDIF
5351         IF(DEBUG.GE.3)WRITE (MONIOU,202)IC1,ICH
5352 202     FORMAT(2X,'PSVDEF-END: QUARK FLAVOR IC1=',I2,
5353      *  'DIQUARK TYPE ICH=',I2)
5354         RETURN
5355         END
5356 C=======================================================================
5357 
5358         FUNCTION PSZSIM(QQ,J)
5359 c PSZSIM - light cone momentum share simulation (for the timelike
5360 c branching)
5361 c QQ - effective momentum value,
5362 c J - type of the parent parton (0-g,1-q)
5363 c-----------------------------------------------------------------------
5364         IMPLICIT DOUBLE PRECISION (A-H,O-Z)
5365         INTEGER DEBUG
5366         COMMON /Q_AREA11/ B10
5367         COMMON /Q_AREA18/ ALM,QT0,QLOG,QLL,AQT0,QTF,BET,AMJ0
5368         COMMON /Q_AREA43/ MONIOU
5369         COMMON /Q_DEBUG/  DEBUG
5370         SAVE
5371         EXTERNAL PSRAN
5372 
5373 
5374         IF(DEBUG.GE.2)WRITE (MONIOU,201)QQ,J
5375 201     FORMAT(2X,'PSZSIM - Z-SHARE SIMULATION: QQ=',E10.3,2X,'J=',I1)
5376         ZMIN=.5D0-DSQRT(.25D0-DSQRT(QTF/QQ))
5377         QLF=DLOG(QTF/ALM)
5378 
5379 1       CONTINUE
5380         IF(J.EQ.1)THEN
5381           PSZSIM=.5D0*(2.D0*ZMIN)**PSRAN(B10)
5382 ******************************************************
5383           GB=PSZSIM*(QGSPSFAP(PSZSIM,0,0)+QGSPSFAP(PSZSIM,0,1))/7.5D0
5384 ******************************************************
5385         ELSE
5386           PSZSIM=ZMIN*((1.D0-ZMIN)/ZMIN)**PSRAN(B10)
5387           GB=PSZSIM*QGSPSFAP(PSZSIM,1,0)*.375D0
5388         ENDIF
5389         QT=QQ*(PSZSIM*(1.D0-PSZSIM))**2
5390         GB=GB/DLOG(QT/ALM)*QLF
5391         IF(DEBUG.GE.3)WRITE (MONIOU,203)QT,GB
5392 203     FORMAT(2X,'PSZSIM: QT=',E10.3,2X,'GB=',E10.3)
5393         IF(PSRAN(B10).GT.GB)GOTO 1
5394         IF(DEBUG.GE.3)WRITE (MONIOU,202)PSZSIM
5395 202     FORMAT(2X,'PSZSIM=',E10.3)
5396         RETURN
5397         END
5398 C=======================================================================
5399 
5400         SUBROUTINE IXXDEF(ICH,IC1,IC2,ICZ)
5401 c Determination of parton flavours in forward and backward direction -
5402 c for valence quark hard scattering
5403 c-----------------------------------------------------------------------
5404         IMPLICIT DOUBLE PRECISION (A-H,O-Z)
5405         INTEGER DEBUG
5406         COMMON /Q_AREA11/ B10
5407         COMMON /Q_AREA43/ MONIOU
5408         COMMON /Q_DEBUG/  DEBUG
5409         SAVE
5410         EXTERNAL PSRAN
5411 
5412         IF(DEBUG.GE.2)WRITE (MONIOU,201)ICH,ICZ
5413 201     FORMAT(2X,'IXXDEF: HADRON TYPE ICH=',I2,' AUXILLIARY TYPE ICZ='
5414      *  ,I1)
5415         IS=IABS(ICH)/ICH
5416         IF(ICZ.EQ.1)THEN
5417           IC1=ICH*(1-3*INT(.5+PSRAN(B10)))
5418           ICH1=ICH*INT(.5D0+PSRAN(B10))
5419           IC2=-IC1*IABS(ICH1)-(ICH+IC1)*IABS(ICH-ICH1)
5420 
5421         ELSEIF(ICZ.EQ.2)THEN
5422 c Valence quark type simulation ( for the proton )
5423           IC1=INT(1.3333+PSRAN(B10))
5424 c Leading nucleon type simulation ( flavors combinatorics )
5425           ICH1=(2-IC1)*INT(PSRAN(B10)+.5)+2
5426 c The type of the parton at the end of the rest string ( after the
5427 c leading nucleon ejection )
5428           IC2=(3-ICH1)*(2-IC1)-2
5429 
5430           IF(IABS(ICH).EQ.3)THEN
5431             IC1=3-IC1
5432             IC2=-3-IC2
5433             ICH1=5-ICH1
5434           ENDIF
5435           IF(ICH.LT.0)THEN
5436             IC1=-IC1
5437             IC2=-IC2
5438             ICH1=-ICH1
5439           ENDIF
5440 
5441         ELSEIF(ICZ.EQ.3)THEN
5442           IC1=ICH-3*IS
5443           IC2=-IS*INT(1.5+PSRAN(B10))
5444           ICH1=3*IS-IC2
5445         ELSEIF(ICZ.EQ.4)THEN
5446           IC1=ICH-9*IS
5447           IC2=IS*INT(1.5+PSRAN(B10))
5448           ICH1=9*IS-IC2
5449         ELSEIF(ICZ.EQ.5)THEN
5450           IC1=IS*INT(1.5+PSRAN(B10))
5451           IC2=-IC1
5452           ICH1=ICH
5453         ENDIF
5454 
5455         ICH=ICH1
5456         IF(DEBUG.GE.3)WRITE (MONIOU,202)IC1,IC2,ICH
5457 202     FORMAT(2X,'IXXDEF-END: PARTON FLAVORS IC1=',I2,' IC2=',I2,
5458      *  'NEW HADRON TYPE ICH=',I2)
5459         RETURN
5460         END
5461 C=======================================================================
5462 
5463       FUNCTION IXXSON(NS,AW,G)
5464 c Poisson distribution:
5465 c AW - average value,
5466 c NS-1 - maximal allowed value,
5467 c G - random number
5468 c-----------------------------------------------------------------------
5469         IMPLICIT DOUBLE PRECISION (A-H,O-Z)
5470         INTEGER DEBUG
5471         COMMON /Q_AREA43/ MONIOU
5472         COMMON /Q_DEBUG/  DEBUG
5473         SAVE
5474 
5475         IF(DEBUG.GE.2)WRITE (MONIOU,201)AW,NS-1,G
5476 201     FORMAT(2X,'IXXSON - POISSON DITR.: AVERAGE AW=',E10.3,
5477      *  ' MAXIMAL VALUE NS=',I2,' RANDOM NUMBER G=',E10.3)
5478       W=EXP(-AW)
5479         SUMM=W
5480         DO 1 I=1,NS
5481         J = I
5482         IF(G.LT.SUMM)GOTO 2
5483         W=W*AW/I
5484 1       SUMM=SUMM+W
5485 2       IXXSON=J-1
5486         IF(DEBUG.GE.3)WRITE (MONIOU,202)IXXSON
5487 202     FORMAT(2X,'IXXSON=',I2)
5488         RETURN
5489         END
5490 C=======================================================================
5491 
5492       SUBROUTINE XXAINI(E0N,ICP0,IAP,IAT)
5493 c Additional initialization procedure
5494 c-----------------------------------------------------------------------
5495       IMPLICIT DOUBLE PRECISION (A-H,O-Z)
5496       INTEGER DEBUG
5497 ******************************************************
5498       DIMENSION WK(3),WA(3)
5499 ******************************************************
5500       COMMON /Q_AREA1/  IA(2),ICZ,ICP
5501       COMMON /Q_AREA2/  S,Y0,WP0,WM0
5502       COMMON /Q_AREA4/  EY0(3)
5503       COMMON /Q_AREA5/  RD(2),CR1(2),CR2(2),CR3(2)
5504       COMMON /Q_AREA6/  PI,BM,AM
5505       COMMON /Q_AREA7/  RP1
5506       COMMON /Q_AREA10/ STMASS,AM0,AMN,AMK,AMC,AMLAMC,AMLAM,AMETA
5507       COMMON /Q_AREA15/ FP(5),RQ(5),CD(5)
5508       COMMON /Q_AREA17/ DEL,RS,RS0,FS,ALFP,RR,SH,DELH
5509       COMMON /Q_AREA22/ SJV,FJS(5,3)
5510       COMMON /Q_AREA35/  SJV0(10,5),FJS0(10,5,15)
5511       COMMON /Q_AREA43/ MONIOU
5512 ******************************************************
5513       COMMON /Q_AREA44/ GZ(10,5,4),GZP(10,5,4)
5514       COMMON /Q_AREA45/ GDT,GDP   !so00
5515 ******************************************************
5516       COMMON /Q_DEBUG/  DEBUG
5517       COMMON /Q_QGSNEX1/ XA,XB,BQGS,BMAXQGS,BMAXNEX,BMINNEX   !ctp
5518       DIMENSION XA(210,3),XB(210,3)
5519       SAVE
5520 
5521         IF(DEBUG.GE.1)WRITE (MONIOU,201)ICP0,IAP,IAT,E0N
5522 201     FORMAT(2X,'XXAINI - MINIINITIALIZATION: PARTICLE TYPE ICP0=',
5523      *  I1,2X,'PROJECTILE MASS NUMBER IAP=',I2/4X,
5524      *  'TARGET MASS NUMBER IAT=',I2,' INTERACTION ENERGY E0N=',E10.3)
5525       ICP=ICP0
5526       IA(1)=IAP
5527       IA(2)=IAT
5528 c ICZ - auxiliary type for the primary particle (1- pion, 2 - nucleon, 3 - kaon,
5529 c 4 - D-meson, 5 - Lambda_C)
5530       IF(IABS(ICP).LT.6)THEN
5531         ICZ=IABS(ICP)/2+1
5532       ELSE
5533         ICZ=(IABS(ICP)+1)/2
5534       ENDIF
5535 
5536 c Energy dependent factors:
5537 c WP0, WM0 - initial light cone momenta for the interaction (E+-p)
5538       S=2.D0*E0N*AMN
5539       WP0=DSQRT(S)
5540       WM0=WP0
5541 c Y0 - total rapidity range for the interaction
5542       Y0=DLOG(S)
5543 c RS - soft pomeron elastic scattering slope (lambda_ab)
5544       RS=RQ(ICZ)+ALFP*Y0
5545 c RS0 - initial slope (sum of the pomeron-hadron vertices slopes squared - R_ab)
5546       RS0=RQ(ICZ)
5547 c FS - factor for pomeron eikonal calculation (gamma_ab * s**del /lambda_ab * C_ab
5548       FS=FP(ICZ)*EXP(Y0*DEL)/RS*CD(ICZ)
5549 c RP1 - factor for the impact parameter dependence of the eikonal ( in fm^2 )
5550       RP1=RS*4.D0*.0391D0/AM**2
5551 
5552       EY0(2)=1.D0
5553       EY0(3)=1.D0
5554       EY0(1)=DSQRT(AMN/E0N/2.D0)
5555 
5556 c-------------------------------------------------
5557 c Nuclear radii and weights for nuclear configurations simulation - procedure GEA
5558       DO 1 I=1,2
5559 c RD(I) - Wood-Saxon density radius (fit to the data of Murthy et al.)
5560       RD(I)=0.7D0*FLOAT(IA(I))**.446/AM
5561       CR1(I)=1.D0+3.D0/RD(I)+6.D0/RD(I)**2+6.D0/RD(I)**3
5562       CR2(I)=3.D0/RD(I)
5563       CR3(I)=3.D0/RD(I)+6.D0/RD(I)**2
5564       IF(IA(I).LT.10.AND.IA(I).NE.1)THEN
5565 c RD(I) - gaussian density radius (for light nucleus)
5566         RD(I)=.9D0*FLOAT(IA(I))**.3333/AM
5567         IF(IA(I).EQ.2)RD(I)=3.16D0
5568 c RD -> RD * A / (A-1) - to use Van Hove simulation method - procedure GEA
5569         RD(I)=RD(I)*DSQRT(2.D0*IA(I)/(IA(I)-1.))
5570       ENDIF
5571 1     CONTINUE
5572 
5573       GDT=0.D0
5574 c-------------------------------------------------
5575 c Impact parameter cutoff setting
5576 c-------------------------------------------------
5577       IF(IA(1).NE.1)THEN
5578 c Primary nucleus:
5579 c Impact parameter cutoff value ( only impact parameters less than BM are
5580 c simulated; probability to have larger impact parameter is less than 1% )
5581         BM=RD(1)+RD(2)+5.D0
5582       ELSE
5583 c Hadron-nucleus interaction
5584 c BM - impact parameter cutoff value
5585         BM=RD(2)+5.D0
5586       ENDIF
5587 
5588       BMAXQGS=BM*AM                 !ctp
5589 
5590       YE=DLOG10(E0N)
5591       IF(YE.LT.1.D0)YE=1.D0
5592       JE=INT(YE)
5593       IF(JE.GT.8)JE=8
5594 
5595 ******************************************************
5596       WK(2)=YE-JE
5597       WK(3)=WK(2)*(WK(2)-1.D0)*.5D0
5598       WK(1)=1.D0-WK(2)+WK(3)
5599       WK(2)=WK(2)-2.D0*WK(3)
5600 
5601       SJV=SJV0(JE,ICZ)*WK(1)+SJV0(JE+1,ICZ)*WK(2)+SJV0(JE+2,ICZ)*WK(3)
5602 
5603       DO 2 I=1,5
5604       DO 2 M=1,3
5605       M1=M+3*(ICZ-1)
5606 2     FJS(I,M)=FJS0(JE,I,M1)*WK(1)+FJS0(JE+1,I,M1)*WK(2)+
5607      *FJS0(JE+2,I,M1)*WK(3)
5608 
5609       GDT=0.D0
5610       GDP=0.D0  !so00
5611       IF(IA(1).EQ.1)THEN
5612         YA=IA(2)
5613         YA=DLOG(YA)/1.38629D0+1.D0
5614         JA=MIN(INT(YA),2)
5615         WA(2)=YA-JA
5616         WA(3)=WA(2)*(WA(2)-1.D0)*.5D0
5617         WA(1)=1.D0-WA(2)+WA(3)
5618         WA(2)=WA(2)-2.D0*WA(3)
5619         DO 3 I=1,3
5620         DO 3 M=1,3
5621         GDP=GDP+GZP(JE+I-1,ICZ,JA+M-1)*WK(I)*WA(M)  !so00
5622 3       GDT=GDT+GZ(JE+I-1,ICZ,JA+M-1)*WK(I)*WA(M)
5623       ENDIF
5624 c        write (*,*)'gdt=',gdt
5625 ******************************************************
5626 
5627         IF(DEBUG.GE.3)WRITE (MONIOU,202)
5628 202     FORMAT(2X,'XXAINI - END')
5629       RETURN
5630       END
5631 C=======================================================================
5632 
5633       SUBROUTINE XXASET
5634 c Particular model parameters setting
5635 c-----------------------------------------------------------------------
5636       IMPLICIT DOUBLE PRECISION (A-H,O-Z)
5637       INTEGER DEBUG
5638       CHARACTER *2 TYQ
5639       COMMON /Q_AREA3/  RMIN,EMAX,EEV
5640       COMMON /Q_AREA6/  PI,BM,AM
5641       COMMON /Q_AREA8/  WWM,BE(4),DC(5),DETA,ALMPT
5642       COMMON /Q_AREA10/ STMASS,AM0,AMN,AMK,AMC,AMLAMC,AMLAM,AMETA
5643       COMMON /Q_AREA11/ B10
5644       COMMON /Q_AREA20/ WPPP
5645       COMMON /Q_AREA21/ DMMIN(5)
5646       COMMON /Q_AREA28/ ARR(4)
5647       COMMON /Q_AREA40/ JDIFR
5648       COMMON /Q_AREA42/ TYQ(15)
5649       COMMON /Q_AREA43/ MONIOU
5650       COMMON /Q_DEBUG/  DEBUG
5651       SAVE
5652 
5653         IF(DEBUG.GE.1)WRITE (MONIOU,201)
5654 201     FORMAT(2X,'XXASET - HADRONIZATION PARAMETERS SETTING')
5655 c Regge intercepts for the uu~, qqq~q~, us~, uc~ trajectories
5656       ARR(1)=0.5D0
5657       ARR(2)=-.5D0
5658       ARR(3)=0.D0
5659       ARR(4)=-2.D0
5660 c WPPP - Triple pomeron interaction probability (for two cut pomerons and cut
5661 c between them)
5662       WPPP=0.4d0
5663 c JDIFR - flag for the low mass diffraction (for JDIFR=0 not considered)
5664       JDIFR=1
5665 
5666 c-------------------------------------------------
5667 c Parameters for the soft fragmentation:
5668 c DC(i) - relative probabilities for udu~d~(i=1), ss~(i=2), cc~(i=3)-pairs creation
5669 c from the vacuum for the quark (u,d,u~,d~) fragmentation;
5670 c ss~(i=4), cc~(i=5) - for the diquark (ud, u~d~) fragmentation
5671       DC(1)=.06D0
5672       DC(2)=.10D0
5673 *     DC(3)=.0003D0     ! To switch off charmed particles set to 0.000
5674       DC(3)=.000D0
5675       DC(4)=.36D0
5676 *     DC(5)=.01D0     ! To switch off charmed particles set to 0.000
5677       DC(5)=.0D0
5678 cc  DETA - ratio of etas production density to all pions production density (1/9)
5679       DETA=.11111D0
5680 c WWM defines mass threshold for string to decay into three or more hadrons
5681 c ( ajustable parameter for string fragmentation )
5682       WWM=.53D0
5683 c BE(i) - parameter for Pt distribution (exponential) for uu~(dd~), ss~, qqq~q~,
5684 c cc~ pairs respectively (for the soft fragmentation)
5685       BE(1)=.22D0
5686       BE(2)=.35D0
5687       BE(3)=.29D0
5688       BE(4)=.40D0
5689 c ALMPT - parameter for the fragmentation functions (soft ones):
5690 c ALMPT = 1 + 2 * alfa_R * <pt**2> (Kaidalov proposed 0.5 value for ALMPT-1,
5691 c Sov.J.Nucl.Phys.,1987))
5692       ALMPT=1.7D0
5693 
5694 c-------------------------------------------------
5695 c Parameters for nuclear spectator part fragmentation:
5696 c RMIN - coupling radius squared (fm^2),
5697 c EMAX - relative critical energy ( divided per mean excitation energy (~12.5 Mev)),
5698 c EEV - relative evaporation energy ( divided per mean excitation energy (~12.5 Mev))
5699       RMIN=3.35D0
5700       EMAX=.11D0
5701       EEV=.25D0
5702 
5703 c-------------------------------------------------
5704 c DMMIN(i) - minimal diffractive mass for low-mass diffraction for pion, nucleon,
5705 c kaon, D-meson, Lambda_C corresp.
5706       DMMIN(1)=.76D0
5707       DMMIN(2)=1.24D0
5708       DMMIN(3)=.89D0
5709       DMMIN(4)=2.01D0
5710       DMMIN(5)=2.45D0
5711 c Proton, kaon, pion, D-meson, Lambda, Lambda_C, eta masses
5712       AMN=.939D0
5713       AMK=.496D0
5714       AM0=.14D0
5715       AMC=1.868D0
5716       AMLAM=1.116D0
5717       AMLAMC=2.27D0
5718       AMETA=.548D0
5719 
5720 c-------------------------------------------------
5721 c B10 - initial value of the pseudorandom number,
5722 c PI  - pi-number
5723 c AM  - diffusive radius for the Saxon-Wood nuclear density parametrization
5724       B10=.43876194D0
5725       PI=3.1416D0
5726       AM=.523D0
5727 
5728 C STMASS - minimal string mass to produce secondary particles
5729       STMASS=4.D0*AM0**2
5730 c Here and below all radii, distances and so on are divided by AM.
5731       RMIN=RMIN/AM**2
5732 
5733       TYQ(1)='DD'
5734       TYQ(2)='UU'
5735       TYQ(3)='C '
5736       TYQ(4)='S '
5737       TYQ(5)='UD'
5738       TYQ(6)='D '
5739       TYQ(7)='U '
5740       TYQ(8)='G '
5741       TYQ(9)='u '
5742       TYQ(10)='d '
5743       TYQ(11)='ud'
5744       TYQ(12)='s '
5745       TYQ(13)='c '
5746       TYQ(14)='uu'
5747       TYQ(15)='dd'
5748         IF(DEBUG.GE.3)WRITE (MONIOU,202)
5749 202     FORMAT(2X,'XXASET - END')
5750       RETURN
5751       END
5752 C=======================================================================
5753 
5754         SUBROUTINE XXDDFR(WP0,WM0,ICP,ICT)
5755 c Double diffractive dissociation
5756 c-----------------------------------------------------------------------
5757         IMPLICIT DOUBLE PRECISION (A-H,O-Z)
5758         INTEGER DEBUG
5759         DIMENSION EP3(4),EY(3)!,EP1(4),EP2(4)
5760         COMMON /Q_AREA1/  IA(2),ICZ,ICP0
5761         COMMON /Q_AREA2/  S,Y0,WP00,WM00
5762         COMMON /Q_AREA8/  WWM,BE(4),DC(5),DETA,ALMPT
5763         COMMON /Q_AREA10/ STMASS,AM(7)
5764         COMMON /Q_AREA11/ B10
5765         COMMON /Q_AREA21/ DMMIN(5)
5766         COMMON /Q_AREA43/ MONIOU
5767         COMMON /Q_DEBUG/  DEBUG
5768         SAVE
5769         EXTERNAL PSRAN
5770 
5771         IF(DEBUG.GE.2)WRITE (MONIOU,201)ICP,ICT,WP0,WM0
5772 201     FORMAT(2X,'XXDDFR - LEADING CLUSTERS HADRONIZATION:'
5773      *  /4X,'CLUSTER TYPES ICP=',I2,2X,
5774      *  'ICT=',I2/4X,'AVAILABLE LIGHT CONE MOMENTA: WP0=',E10.3,
5775      *  ' WM0=',E10.3)
5776         DO 100 I=1,3
5777 100     EY(I)=1.D0
5778 
5779         SD0=WP0*WM0
5780         IF(SD0.LT.0.D0)SD0=0.D0
5781         DDMIN1=DMMIN(ICZ)
5782         DDMIN2=DMMIN(2)
5783         DDMAX1=MIN(5.D0,DSQRT(SD0)-DDMIN2)
5784 
5785         IF(DDMAX1.LT.DDMIN1)THEN
5786 c Registration of too slow "leading" hadron if its energy is insufficient for
5787 c diffractive exhitation
5788           IF(DSQRT(SD0).LT.AM(ICZ)+AM(2))THEN
5789             IF(WP0.GT.0.D0.AND.(AM(ICZ)+AM(2))**2/WP0.LT..5D0*WM00)THEN
5790               SD0=(AM(ICZ)+AM(2))**2
5791               WM0=SD0/WP0
5792             ELSE
5793         IF(DEBUG.GE.3)WRITE (MONIOU,202)
5794               RETURN
5795             ENDIF
5796           ENDIF
5797 
5798           EP3(3)=0.D0
5799           EP3(4)=0.D0
5800           XW=XXTWDEC(SD0,AM(ICZ)**2,AM(2)**2)
5801           WP1=XW*WP0
5802           WM1=AM(ICZ)**2/WP1
5803           EP3(1)=.5D0*(WP1+WM1)
5804           EP3(2)=.5D0*(WP1-WM1)
5805           CALL XXREG(EP3,ICP)
5806           WM2=WM0-WM1
5807           WP2=AM(2)**2/WM2
5808           EP3(1)=.5D0*(WP2+WM2)
5809           EP3(2)=.5D0*(WP2-WM2)
5810           CALL XXREG(EP3,ICT)
5811           WP0=0.D0
5812           WM0=0.D0
5813         IF(DEBUG.GE.3)WRITE (MONIOU,202)
5814           RETURN
5815         ENDIF
5816 
5817         DMASS1=(DDMIN1/(1.D0-PSRAN(B10)*(1.D0-DDMIN1/DDMAX1)))**2
5818         DDMAX2=MIN(5.D0,DSQRT(SD0)-DSQRT(DMASS1))
5819         DMASS2=(DDMIN2/(1.D0-PSRAN(B10)*(1.D0-DDMIN2/DDMAX2)))**2
5820 
5821         WPD1=WP0*XXTWDEC(SD0,DMASS1,DMASS2)
5822         WMD1=DMASS1/WPD1
5823         WMD2=WM0-WMD1
5824         WPD2=DMASS2/WMD2
5825 
5826         IF(ICP.NE.0)IS=IABS(ICP)/ICP
5827         IF(ICZ.EQ.5)THEN
5828           ICH1=ICP
5829           ICH2=0
5830           AMH1=AM(5)**2
5831           AMH2=AM(1)**2
5832 
5833           PTMAX=QGSPSLAM(DMASS1,AMH1,AMH2)
5834           IF(PTMAX.LT.0.)PTMAX=0.
5835           IF(PTMAX.LT.BE(4)**2)THEN
5836 1           PTI=PTMAX*PSRAN(B10)
5837             IF(PSRAN(B10).GT.EXP(-DSQRT(PTI)/BE(4)))GOTO 1
5838           ELSE
5839 2           PTI=(BE(4)*DLOG(PSRAN(B10)*PSRAN(B10)))**2
5840             IF(PTI.GT.PTMAX)GOTO 2
5841           ENDIF
5842           AMT1=AMH1+PTI
5843           AMT2=AMH2+PTI
5844           Z=XXTWDEC(DMASS1,AMT1,AMT2)
5845           WP1=WPD1*Z
5846           WM1=AMT1/WP1
5847           EP3(1)=.5D0*(WP1+WM1)
5848           EP3(2)=.5D0*(WP1-WM1)
5849           PT=DSQRT(PTI)
5850           CALL QGSPSCS(C,S)
5851           EP3(3)=PT*C
5852           EP3(4)=PT*S
5853           CALL XXREG(EP3,ICH1)
5854 
5855           WP1=WPD1*(1.D0-Z)
5856           WM1=AMT2/WP1
5857           EP3(1)=.5D0*(WP1+WM1)
5858           EP3(2)=.5D0*(WP1-WM1)
5859           EP3(3)=-PT*C
5860           EP3(4)=-PT*S
5861           CALL XXREG(EP3,ICH2)
5862           GOTO 3
5863         ENDIF
5864 
5865         IF(ICZ.EQ.1)THEN
5866           IF(ICP.NE.0)THEN
5867             IC1=ICP*(1-3*INT(.5D0+PSRAN(B10)))
5868             IC2=-ICP-IC1
5869           ELSE
5870             IC1=INT(1.5D0+PSRAN(B10))*(2*INT(.5D0+PSRAN(B10))-1)
5871             IC2=-IC1
5872           ENDIF
5873         ELSEIF(ICZ.EQ.2)THEN
5874           IF(PSRAN(B10).GT..33333D0)THEN
5875             IC1=3*IS
5876             IC2=ICP-IS
5877           ELSE
5878             IC1=ICP+4*IS
5879             IC2=4*IS-ICP
5880           ENDIF
5881         ELSEIF(ICZ.EQ.3)THEN
5882           IC1=-4*IS
5883           IC2=ICP-3*IS
5884         ELSEIF(ICZ.EQ.4)THEN
5885           IC1=5*IS
5886           IC2=ICP-9*IS
5887         ENDIF
5888         CALL XXGENER(WPD1,WMD1,EY,0.D0,1.D0,0.D0,1.D0,IC1,IC2)
5889 
5890 3       CONTINUE
5891         IS=IABS(ICT)/ICT
5892         IF(PSRAN(B10).GT..33333D0)THEN
5893           IC1=3*IS
5894           IC2=ICT-IS
5895         ELSE
5896           IC1=ICT+4*IS
5897           IC2=4*IS-ICT
5898         ENDIF
5899         CALL XXGENER(WPD2,WMD2,EY,0.D0,1.D0,0.D0,1.D0,IC2,IC1)
5900         IF(DEBUG.GE.3)WRITE (MONIOU,202)
5901 202     FORMAT(2X,'XXDDFR - END')
5902         RETURN
5903         END
5904 C=======================================================================
5905 
5906         SUBROUTINE XXDEC2(EP,EP1,EP2,WW,A,B)
5907 c Two particle decay
5908 c-----------------------------------------------------------------------
5909         IMPLICIT DOUBLE PRECISION (A-H,O-Z)
5910         INTEGER DEBUG
5911         dimension ep(4),ep1(4),ep2(4),EY(3)
5912         COMMON /Q_AREA43/ MONIOU
5913         COMMON /Q_DEBUG/  DEBUG
5914         COMMON /Q_AREA11/ B10
5915         SAVE
5916         EXTERNAL PSRAN
5917 
5918         IF(DEBUG.GE.2)WRITE (MONIOU,201)
5919 201     FORMAT(2X,'XXDEC2 - TWO PARTICLE DECAY')
5920 
5921         PL=QGSPSLAM(WW,A,B)
5922         EP1(1)=DSQRT(PL+A)
5923         EP2(1)=DSQRT(PL+B)
5924         PL=DSQRT(PL)
5925         COSZ=2.D0*PSRAN(B10)-1.D0
5926         PT=PL*DSQRT(1.D0-COSZ**2)
5927         EP1(2)=PL*COSZ
5928         CALL QGSPSCS(C,S)
5929         EP1(3)=PT*C
5930         EP1(4)=PT*S
5931         do 1 I=2,4
5932 1       EP2(I)=-EP1(I)
5933         CALL QGSPSDEFTR(WW,EP,EY)
5934         CALL QGSPSTRANS(EP1,EY)
5935         CALL QGSPSTRANS(EP2,EY)
5936         IF(DEBUG.GE.3)WRITE (MONIOU,202)
5937 202     FORMAT(2X,'XXDEC2 - END')
5938         RETURN
5939         END
5940 C=======================================================================
5941 
5942         SUBROUTINE XXDEC3(EP,EP1,EP2,EP3,SWW,AM1,AM2,AM3)
5943 
5944 c-----------------------------------------------------------------------
5945         IMPLICIT DOUBLE PRECISION (A-H,O-Z)
5946         INTEGER DEBUG
5947         DIMENSION EP(4),EP1(4),EP2(4),EP3(4),EPT(4),EY(3)
5948         COMMON/AREA11/B10
5949         COMMON /Q_AREA43/ MONIOU
5950         COMMON /Q_DEBUG/  DEBUG
5951         SAVE
5952         EXTERNAL PSRAN
5953 
5954         IF(DEBUG.GE.2)WRITE (MONIOU,201)
5955 201     FORMAT(2X,'XXDEC3 - THREE PARTICLE DECAY')
5956         AM12=AM1**2
5957         AM23=(AM2+AM3)**2
5958         AM32=(AM2-AM3)**2
5959         S23MAX=(SWW-AM1)**2
5960         EMAX=.25D0*(SWW+(AM12-AM23)/SWW)**2
5961         GB0=DSQRT((EMAX-AM12)/EMAX*(1.D0-AM23/S23MAX)
5962      *  *(1.D0-AM32/S23MAX))
5963 1       P1=PSRAN(B10)*(EMAX-AM12)
5964         E1=DSQRT(P1+AM12)
5965         S23=SWW**2+AM12-2.D0*E1*SWW
5966         GB=DSQRT(P1*(1.D0-AM23/S23)*(1.D0-AM32/S23))/E1/GB0
5967         IF(PSRAN(B10).GT.GB)GOTO 1
5968 
5969         P1=DSQRT(P1)
5970         EP1(1)=E1
5971         COSZ=2.D0*PSRAN(B10)-1.D0
5972         PT=P1*DSQRT(1.D0-COSZ**2)
5973         EP1(2)=P1*COSZ
5974         CALL QGSPSCS(C,S)
5975         EP1(3)=PT*C
5976         EP1(4)=PT*S
5977         do 2 I=2,4
5978 2       EPT(I)=-EP1(I)
5979         EPT(1)=SWW-EP1(1)
5980         CALL QGSPSDEFTR(SWW**2,EP,EY)
5981         CALL QGSPSTRANS(EP1,EY)
5982         CALL QGSPSTRANS(EPT,EY)
5983 
5984         CALL XXDEC2(EPT,EP2,EP3,S23,AM2**2,AM3**2)
5985         IF(DEBUG.GE.3)WRITE (MONIOU,202)
5986 202     FORMAT(2X,'XXDEC3 - END')
5987         RETURN
5988         END
5989 C=======================================================================
5990 
5991         SUBROUTINE XXDPR(WP0,WM0,ICP,ICT,LQ2)
5992 c Projectile hadron dissociation
5993 c Leading hadronic state hadronization
5994 c-----------------------------------------------------------------------
5995         IMPLICIT DOUBLE PRECISION (A-H,O-Z)
5996         INTEGER DEBUG
5997         DIMENSION EP3(4),EY(3)!,EP1(4),EP2(4)
5998         COMMON /Q_AREA1/  IA(2),ICZ,ICP0
5999         COMMON /Q_AREA2/  S,Y0,WP00,WM00
6000         COMMON /Q_AREA8/  WWM,BE(4),DC(5),DETA,ALMPT
6001         COMMON /Q_AREA10/ STMASS,AM(7)
6002         COMMON /Q_AREA11/ B10
6003         COMMON /Q_AREA17/ DEL,RS,RS0,FS,ALFP,RR,SH,DELH
6004         COMMON /Q_AREA21/ DMMIN(5)
6005         COMMON /Q_AREA43/ MONIOU
6006         COMMON /Q_DEBUG/  DEBUG
6007         SAVE
6008         EXTERNAL PSRAN
6009 
6010 
6011         IF(DEBUG.GE.2)WRITE (MONIOU,201)ICP,ICT,WP0,WM0
6012 201     FORMAT(2X,'XXDPR - LEADING (PROJECTILE) CLUSTER HADRONIZATION:'
6013      *  /4X,'CLUSTER TYPE ICP=',I2,2X,'TARGET TYPE ',
6014      *  'ICT=',I2/4X,'AVAILABLE LIGHT CONE MOMENTA: WP0=',E10.3,
6015      *  ' WM0=',E10.3)
6016         DO 100 I=1,3
6017 100     EY(I)=1.D0
6018 
6019         SD0=WP0*WM0
6020         IF(SD0.LT.0.D0)SD0=0.D0
6021         DDMAX=MIN(5.D0,DSQRT(SD0)-AM(2))
6022         DDMIN=DMMIN(ICZ)
6023 
6024         IF(DDMAX.LT.DDMIN)THEN
6025 c Registration of too slow "leading" hadron if its energy is insufficient for
6026 c diffractive exhitation
6027           EP3(3)=0.D0
6028           EP3(4)=0.D0
6029 
6030           IF(LQ2.NE.0)THEN
6031             WPI=WP0
6032             IF(AM(ICZ)**2.GT.WPI*WM0)THEN
6033               IF(WPI.GT.0.D0.AND.AM(ICZ)**2/WPI.LT..5D0*WM00)THEN
6034                 WMI=AM(ICZ)**2/WPI
6035                 WM0=WMI
6036               ELSE
6037                 RETURN
6038               ENDIF
6039 cdh 2 lines added  in accordance with s. ostapchenko 17.9.99
6040             ELSE
6041               WMI=AM(ICZ)**2/WPI
6042 cdh
6043             ENDIF
6044             WM0=WM0-WMI
6045             WP0=0.D0
6046             EP3(1)=.5D0*(WPI+WMI)
6047             EP3(2)=.5D0*(WPI-WMI)
6048             CALL XXREG(EP3,ICP)
6049         IF(DEBUG.GE.3)WRITE (MONIOU,202)
6050             RETURN
6051           ELSE
6052 
6053             IF(DSQRT(SD0).LT.AM(ICZ)+AM(2))THEN
6054               IF(WP0.GT.0.D0.AND.(AM(ICZ)+AM(2))**2/WP0.LT..5D0*WM00)
6055      *        THEN
6056                 SD0=(AM(ICZ)+AM(2))**2
6057                 WM0=SD0/WP0
6058               ELSE
6059         IF(DEBUG.GE.3)WRITE (MONIOU,202)
6060                 RETURN
6061               ENDIF
6062             ENDIF
6063             XW=XXTWDEC(SD0,AM(ICZ)**2,AM(2)**2)
6064             WP1=XW*WP0
6065             WM1=AM(ICZ)**2/WP1
6066             EP3(1)=.5D0*(WP1+WM1)
6067             EP3(2)=.5D0*(WP1-WM1)
6068             CALL XXREG(EP3,ICP)
6069             WM2=WM0-WM1
6070             WP2=AM(2)**2/WM2
6071             EP3(1)=.5D0*(WP2+WM2)
6072             EP3(2)=.5D0*(WP2-WM2)
6073             CALL XXREG(EP3,ICT)
6074             WP0=0.D0
6075             WM0=0.D0
6076           ENDIF
6077         IF(DEBUG.GE.3)WRITE (MONIOU,202)
6078           RETURN
6079         ENDIF
6080 
6081         IF(ICP.NE.0)IS=IABS(ICP)/ICP
6082 
6083         DMASS=DDMIN**2/(1.D0-PSRAN(B10)*(1.D0-(DDMIN/DDMAX)))**2
6084 
6085         IF(LQ2.NE.0)THEN
6086           WPD=WP0
6087           WMD=DMASS/WPD
6088           WM0=WM0-WMD
6089           WP0=0.D0
6090         ELSE
6091         IF(ICZ.EQ.5)THEN
6092           WPD=WP0*XXTWDEC(SD0,DMASS,AM(2)**2)
6093           WMD=DMASS/WPD
6094           WM2=WM0-WMD
6095           WP2=AM(2)**2/WM2
6096           EP3(1)=.5D0*(WP2+WM2)
6097           EP3(2)=.5D0*(WP2-WM2)
6098           EP3(3)=0.D0
6099           EP3(4)=0.D0
6100           CALL XXREG(EP3,ICT)
6101         ELSE
6102           PTMAX=QGSPSLAM(SD0,DMASS,AM(2)**2)
6103           IF(PTMAX.LT.0.)PTMAX=0.
6104           PTI=-1.D0/RS*DLOG(1.D0-PSRAN(B10)*(1.D0-EXP(-RS*PTMAX)))
6105 
6106           AMT1=DMASS+PTI
6107           AMT2=AM(2)**2+PTI
6108           WPD=WP0*XXTWDEC(SD0,AMT1,AMT2)
6109           WMD=AMT1/WPD
6110           WM2=WM0-WMD
6111           WP2=AMT2/WM2
6112           PT=DSQRT(PTI)
6113           CALL QGSPSCS(CCOS,SSIN)
6114           EP3(3)=PT*CCOS
6115           EP3(4)=PT*SSIN
6116           EP3(1)=.5D0*(WP2+WM2)
6117           EP3(2)=.5D0*(WP2-WM2)
6118           CALL XXREG(EP3,ICT)
6119           EP3(3)=-EP3(3)
6120           EP3(4)=-EP3(4)
6121           EP3(1)=.5D0*(WPD+WMD)
6122           EP3(2)=.5D0*(WPD-WMD)
6123           CALL QGSPSDEFTR(DMASS,EP3,EY)
6124           WPD=DSQRT(DMASS)
6125           WMD=WPD
6126         ENDIF
6127           WP0=0.D0
6128           WM0=0.D0
6129         ENDIF
6130 
6131         IF(ICZ.EQ.5)THEN
6132           ICH1=ICP
6133           ICH2=0
6134           AMH1=AM(5)**2
6135           AMH2=AM(1)**2
6136 
6137           PTMAX=QGSPSLAM(DMASS,AMH1,AMH2)
6138           IF(PTMAX.LT.0.)PTMAX=0.
6139           IF(PTMAX.LT.BE(4)**2)THEN
6140 1           PTI=PTMAX*PSRAN(B10)
6141             IF(PSRAN(B10).GT.EXP(-DSQRT(PTI)/BE(4)))GOTO 1
6142           ELSE
6143 2           PTI=(BE(4)*DLOG(PSRAN(B10)*PSRAN(B10)))**2
6144             IF(PTI.GT.PTMAX)GOTO 2
6145           ENDIF
6146           AMT1=AMH1+PTI
6147           AMT2=AMH2+PTI
6148           Z=XXTWDEC(DMASS,AMT1,AMT2)
6149           WP1=WPD*Z
6150           WM1=AMT1/WP1
6151           EP3(1)=.5D0*(WP1+WM1)
6152           EP3(2)=.5D0*(WP1-WM1)
6153           PT=DSQRT(PTI)
6154           CALL QGSPSCS(C,S)
6155           EP3(3)=PT*C
6156           EP3(4)=PT*S
6157           CALL XXREG(EP3,ICH1)
6158 
6159           WP1=WPD*(1.D0-Z)
6160           WM1=AMT2/WP1
6161           EP3(1)=.5D0*(WP1+WM1)
6162           EP3(2)=.5D0*(WP1-WM1)
6163           EP3(3)=-PT*C
6164           EP3(4)=-PT*S
6165           CALL XXREG(EP3,ICH2)
6166         IF(DEBUG.GE.3)WRITE (MONIOU,202)
6167           RETURN
6168         ENDIF
6169 
6170         IF(ICZ.EQ.1)THEN
6171           IF(ICP.NE.0)THEN
6172             IC1=ICP*(1-3*INT(.5D0+PSRAN(B10)))
6173             IC2=-ICP-IC1
6174           ELSE
6175             IC1=INT(1.5D0+PSRAN(B10))*(2*INT(.5D0+PSRAN(B10))-1)
6176             IC2=-IC1
6177           ENDIF
6178         ELSEIF(ICZ.EQ.2)THEN
6179           IF(PSRAN(B10).GT..33333D0)THEN
6180             IC1=3*IS
6181             IC2=ICP-IS
6182           ELSE
6183             IC1=ICP+4*IS
6184             IC2=4*IS-ICP
6185           ENDIF
6186         ELSEIF(ICZ.EQ.3)THEN
6187           IC1=-4*IS
6188           IC2=ICP-3*IS
6189         ELSEIF(ICZ.EQ.4)THEN
6190           IC1=5*IS
6191           IC2=ICP-9*IS
6192         ENDIF
6193         CALL XXGENER(WPD,WMD,EY,0.D0,1.D0,0.D0,1.D0,
6194      *  IC1,IC2)
6195         IF(DEBUG.GE.3)WRITE (MONIOU,202)
6196 202     FORMAT(2X,'XXDPR - END')
6197         RETURN
6198         END
6199 C=======================================================================
6200 
6201         SUBROUTINE XXDTG(WP0,WM0,ICP,ICT,LQ1)
6202 c Target nucleon dissociation
6203 c Leading hadronic state hadronization
6204 c-----------------------------------------------------------------------
6205         IMPLICIT DOUBLE PRECISION (A-H,O-Z)
6206         INTEGER DEBUG
6207         DIMENSION EP3(4),EY(3)
6208         COMMON /Q_AREA1/  IA(2),ICZ,ICP0
6209         COMMON /Q_AREA2/  S,Y0,WP00,WM00
6210         COMMON /Q_AREA10/ STMASS,AM(7)
6211         COMMON /Q_AREA11/ B10
6212         COMMON /Q_AREA17/ DEL,RS,RS0,FS,ALFP,RR,SH,DELH
6213         COMMON /Q_AREA21/ DMMIN(5)
6214         COMMON /Q_AREA43/ MONIOU
6215         COMMON /Q_DEBUG/  DEBUG
6216         SAVE
6217         EXTERNAL PSRAN
6218 
6219 
6220         IF(DEBUG.GE.2)WRITE (MONIOU,201)ICT,ICP,WP0,WM0
6221 201     FORMAT(2X,'XXDTG - LEADING (TARGET) CLUSTER HADRONIZATION:'
6222      *  /4X,'CLUSTER TYPE ICT=',I2,2X,'PROJECTILE TYPE ',
6223      *  'ICP=',I2/4X,'AVAILABLE LIGHT CONE MOMENTA: WP0=',E10.3,
6224      *  ' WM0=',E10.3)
6225         DO 100 I=1,3
6226 100     EY(I)=1.D0
6227 
6228         SD0=WP0*WM0
6229         IF(SD0.LT.0.D0)SD0=0.D0
6230         DDMIN=DMMIN(2)
6231         DDMAX=MIN(5.D0,DSQRT(SD0)-AM(ICZ))
6232 
6233         IF(DDMAX.LT.DDMIN)THEN
6234 c Registration of too slow "leading" hadron if its energy is insufficient for
6235 c diffractive exhitation
6236           EP3(3)=0.D0
6237           EP3(4)=0.D0
6238 
6239           IF(LQ1.NE.0)THEN
6240             WMI=WM0
6241             IF( WP0.LE.0.D0.OR.AM(2)**2.GT.WMI*WP0)RETURN
6242             WPI=AM(2)**2/WMI
6243             WP0=WP0-WPI
6244             WM0=0.D0
6245             EP3(1)=.5D0*(WPI+WMI)
6246             EP3(2)=.5D0*(WPI-WMI)
6247             CALL XXREG(EP3,ICT)
6248         IF(DEBUG.GE.3)WRITE (MONIOU,202)
6249             RETURN
6250           ELSE
6251 
6252             IF(DSQRT(SD0).LT.AM(ICZ)+AM(2))THEN
6253               IF(WP0.GT.0.D0.AND.(AM(ICZ)+AM(2))**2/WP0.LT..5D0*WM00)
6254      *        THEN
6255                 SD0=(AM(ICZ)+AM(2))**2
6256                 WM0=SD0/WP0
6257               ELSE
6258         IF(DEBUG.GE.3)WRITE (MONIOU,202)
6259                 RETURN
6260               ENDIF
6261             ENDIF
6262             XW=XXTWDEC(SD0,AM(ICZ)**2,AM(2)**2)
6263             WP1=XW*WP0
6264             WM1=AM(ICZ)**2/WP1
6265             EP3(1)=.5D0*(WP1+WM1)
6266             EP3(2)=.5D0*(WP1-WM1)
6267             CALL XXREG(EP3,ICP)
6268             WM2=WM0-WM1
6269             WP2=AM(2)**2/WM2
6270             EP3(1)=.5D0*(WP2+WM2)
6271             EP3(2)=.5D0*(WP2-WM2)
6272             CALL XXREG(EP3,ICT)
6273             WP0=0.D0
6274             WM0=0.D0
6275           ENDIF
6276         IF(DEBUG.GE.3)WRITE (MONIOU,202)
6277           RETURN
6278         ENDIF
6279 
6280         DMASS=(DDMIN/(1.D0-PSRAN(B10)*(1.D0-DDMIN/DDMAX)))**2
6281         IF(LQ1.NE.0)THEN
6282           WMD=WM0
6283           WPD=DMASS/WMD
6284           WP0=WP0-WPD
6285           WM0=0.D0
6286         ELSE
6287           PTMAX=QGSPSLAM(SD0,DMASS,AM(ICZ)**2)
6288           IF(PTMAX.LT.0.)PTMAX=0.
6289           PTI=-1.D0/RS*DLOG(1.D0-PSRAN(B10)*(1.D0-EXP(-RS*PTMAX)))
6290 
6291           AMT1=DMASS+PTI
6292           AMT2=AM(ICZ)**2+PTI
6293           WMD=WM0*XXTWDEC(SD0,AMT1,AMT2)
6294           WPD=AMT1/WMD
6295           WP2=WP0-WPD
6296           WM2=AMT2/WP2
6297           PT=DSQRT(PTI)
6298           CALL QGSPSCS(CCOS,SSIN)
6299           EP3(3)=PT*CCOS
6300           EP3(4)=PT*SSIN
6301           EP3(1)=.5D0*(WP2+WM2)
6302           EP3(2)=.5D0*(WP2-WM2)
6303           CALL XXREG(EP3,ICP)
6304           EP3(3)=-EP3(3)
6305           EP3(4)=-EP3(4)
6306           EP3(1)=.5D0*(WPD+WMD)
6307           EP3(2)=.5D0*(WPD-WMD)
6308           CALL QGSPSDEFTR(DMASS,EP3,EY)
6309           WPD=DSQRT(DMASS)
6310           WMD=WPD
6311           WP0=0.D0
6312           WM0=0.D0
6313         ENDIF
6314 
6315         IS=IABS(ICT)/ICT
6316         IF(PSRAN(B10).GT..33333D0)THEN
6317           IC1=3*IS
6318           IC2=ICT-IS
6319         ELSE
6320           IC1=ICT+4*IS
6321           IC2=4*IS-ICT
6322         ENDIF
6323         CALL XXGENER(WPD,WMD,EY,
6324      *  0.D0,1.D0,0.D0,1.D0,IC2,IC1)
6325         IF(DEBUG.GE.3)WRITE (MONIOU,202)
6326 202     FORMAT(2X,'XXDTG - END')
6327         RETURN
6328         END
6329 C=======================================================================
6330 
6331         SUBROUTINE XXFAU(B,GZ)
6332 c Integrands for hadron-hadron and hadron-nucleus cross-sections calculation
6333 c-----------------------------------------------------------------------
6334         IMPLICIT DOUBLE PRECISION (A-H,O-Z)
6335         INTEGER DEBUG
6336         DIMENSION GZ(3),GZ0(2)
6337         COMMON /Q_AREA1/  IA(2),ICZ,ICP
6338         COMMON /Q_AREA16/ CC(5)
6339         COMMON /Q_AR1/    ANORM
6340         COMMON /Q_AREA43/ MONIOU
6341         COMMON /Q_DEBUG/  DEBUG
6342         SAVE
6343 
6344         IF(DEBUG.GE.2)WRITE (MONIOU,201)
6345 201     FORMAT(2X,'XXFAU - INTEGRANDS FOR HADRON-HADRON AND '
6346      *    ,'HADRON-NUCLEUS CROSS-SECTIONS CALCULATION')
6347 
6348         CALL XXFZ(B,GZ0)
6349         DO 1 L=1,2
6350 1       GZ0(L)=GZ0(L)*CC(2)*ANORM*.5D0
6351 
6352         AB=FLOAT(IA(2))
6353 
6354         GZ1=(1.D0-GZ0(1))**AB
6355         GZ2=(1.D0-GZ0(2))**AB
6356         GZ3=(1.D0-CC(2)*GZ0(2)-2.D0*(1.D0-CC(2))*GZ0(1))**AB
6357 
6358 
6359         GZ(1)=CC(ICZ)**2*(GZ2-GZ3)
6360         GZ(2)=CC(ICZ)*(1.D0-CC(ICZ))*(1.D0+GZ2-2.D0*GZ1)
6361         GZ(3)=CC(ICZ)*(1.D0-GZ2)
6362         IF(DEBUG.GE.3)WRITE (MONIOU,202)
6363 202     FORMAT(2X,'XXFAU - END')
6364         RETURN
6365         END
6366 C=======================================================================
6367 
6368          SUBROUTINE XXFRAG(SA,NA,RC)
6369 c Connected nucleon clasters extraction - used for the nuclear spectator part
6370 c multifragmentation:
6371 c-----------------------------------------------------------------------
6372          IMPLICIT DOUBLE PRECISION (A-H,O-Z)
6373          INTEGER DEBUG
6374 cdh      DIMENSION SA(56,3)
6375          DIMENSION SA(210,3)
6376          COMMON /Q_AREA13/ NSF,IAF(56)
6377          COMMON /Q_AREA43/ MONIOU
6378          COMMON /Q_DEBUG/  DEBUG
6379          SAVE
6380 
6381          IF(DEBUG.GE.2)WRITE (MONIOU,201)NA
6382 201      FORMAT(2X,'XXFRAG-MULTIFRAGMENTATION: NUCLEUS MASS NUMBER: NA='
6383      *   ,I2)
6384          IF(DEBUG.GE.3)THEN
6385            WRITE (MONIOU,203)
6386 203        FORMAT(2X,'NUCLEONS COORDINATES:')
6387 204        FORMAT(2X,3E10.3)
6388            DO 205 I=1,NA
6389 205        WRITE (MONIOU,204)(SA(I,L),L=1,3)
6390          ENDIF
6391 
6392          NI=1
6393          NG=1
6394          J=0
6395 1        J=J+1
6396          J1=NI+1
6397          DO 4 I=J1,NA
6398          RI=0.D0
6399          DO 2 M=1,3
6400 2        RI=RI+(SA(J,M)-SA(I,M))**2
6401          IF(RI.GT.RC)GOTO 4
6402          NI=NI+1
6403          NG=NG+1
6404          IF(I.EQ.NI)GOTO 4
6405          DO 3 M=1,3
6406          S0=SA(NI,M)
6407          SA(NI,M)=SA(I,M)
6408 3        SA(I,M)=S0
6409 4        CONTINUE
6410          IF(J.LT.NI.AND.NA-NI.GT.0)GOTO 1
6411          NSF=NSF+1
6412          IAF(NSF)=NG
6413          IF(DEBUG.GE.3)WRITE (MONIOU,206)NSF,IAF(NSF)
6414 206      FORMAT(2X,'XXFRAG: FRAGMENT N',I2,2X,'FRAGMENT MASS - ',I2)
6415          NG=1
6416          J=NI
6417          NI=NI+1
6418          IF(NA-NI)6,5,1
6419 5        NSF=NSF+1
6420          IAF(NSF)=1
6421          IF(DEBUG.GE.3)WRITE (MONIOU,206)NSF,IAF(NSF)
6422 6        CONTINUE
6423          IF(DEBUG.GE.3)WRITE (MONIOU,202)
6424 202      FORMAT(2X,'XXFRAG - END')
6425          RETURN
6426          END
6427 C=======================================================================
6428 
6429       SUBROUTINE XXFRAGM(NS,XA)
6430 c Fragmentation of the spectator part of the nucleus
6431 c XA(56,3) - arrays for spectator nucleons positions
6432 c NS - total number of spectators
6433 c-----------------------------------------------------------------------
6434       IMPLICIT DOUBLE PRECISION (A-H,O-Z)
6435 cdh   DIMENSION XA(56,3)
6436       DIMENSION XA(210,3)
6437       INTEGER DEBUG
6438       COMMON /Q_AREA1/  IA(2),ICZ,ICP
6439       COMMON /Q_AREA3/  RMIN,EMAX,EEV
6440       COMMON /Q_AREA11/ B10
6441 c NSF - number of secondary fragments;
6442 c IAF(i) - mass of the i-th fragment
6443       COMMON /Q_AREA13/ NSF,IAF(56)
6444       COMMON /Q_AREA43/ MONIOU
6445       COMMON /Q_DEBUG/  DEBUG
6446       SAVE
6447       EXTERNAL PSRAN
6448 
6449         IF(DEBUG.GE.2)WRITE (MONIOU,201)NS
6450 201     FORMAT(2X,'XXFRAGM: NUMBER OF SPECTATORS: NS=',I2)
6451 
6452         NSF=0
6453 
6454         IF(NS-1)6,1,2
6455 c Single spectator nucleon is recorded
6456 1     NSF=NSF+1
6457       IAF(NSF)=1
6458         IF(DEBUG.GE.3)WRITE (MONIOU,205)
6459 205     FORMAT(2X,'XXFRAGM - SINGLE SPECTATOR')
6460         GOTO 6
6461 2       EEX=0.D0
6462 c EEX - spectator part excitation energy; calculated as the sum of excitations
6463 c from all wounded nucleons ( including diffractively excited )
6464         DO 3 I=1,IA(1)-NS
6465 c Partial excitation is simulated according to distribution f(E) ~ 1/sqrt(E)
6466 c * exp(-E/(2*<E>)), for sqrt(E) we have then normal distribution
6467 3     EEX=EEX+(PSRAN(B10)+PSRAN(B10)+PSRAN(B10)+
6468      *      PSRAN(B10)+PSRAN(B10)-2.5D0)**2*2.4D0
6469           IF(DEBUG.GE.3)WRITE (MONIOU,203)EEX
6470 203     FORMAT(2X,'XXFRAGM: EXCITATION ENERGY: EEX=',E10.3)
6471 
6472 c If the excitation energy per spectator is larger than EMAX
6473 c multifragmentation takes place ( percolation algorithm is used for it )
6474         IF(EEX/NS.GT.EMAX)THEN
6475 c Multifragmentation
6476           CALL XXFRAG(XA,NS,RMIN)
6477         ELSE
6478 
6479 c Otherwise average number of eveporated nucleons equals EEX/EEV, where
6480 c EEV - mean excitation energy carried out by one nucleon
6481           NF=IXXSON(NS,EEX/EEV,PSRAN(B10))
6482           NSF=NSF+1
6483 c Recording of the fragment produced
6484           IAF(NSF)=NS-NF
6485           IF(DEBUG.GE.3)WRITE (MONIOU,206)IAF(NSF)
6486 206     FORMAT(2X,'XXFRAGM - EVAPORATION: MASS NUMBER OF THE FRAGMENT:'
6487      *  ,I2)
6488 
6489 c Some part of excitation energy is carried out by alphas; we determine the
6490 c number of alphas simply as NF/4
6491           NAL=NF/4
6492           IF(NAL.NE.0)THEN
6493 c Recording of the evaporated alphas
6494             DO 4 I=1,NAL
6495             NSF=NSF+1
6496 4           IAF(NSF)=4
6497           ENDIF
6498 
6499           NF=NF-4*NAL
6500           IF(NF.NE.0)THEN
6501 c Recording of the evaporated nucleons
6502             DO 5 I=1,NF
6503             NSF=NSF+1
6504 5           IAF(NSF)=1
6505           ENDIF
6506           IF(DEBUG.GE.3)WRITE (MONIOU,204)NF,NAL
6507 204     FORMAT(2X,'XXFRAGM - EVAPORATION: NUMBER OF NUCLEONS NF=',I2,
6508      *  'NUMBER OF ALPHAS NAL=',I2)
6509         ENDIF
6510 6       CONTINUE
6511         IF(DEBUG.GE.3)WRITE (MONIOU,202)
6512 202     FORMAT(2X,'XXFRAGM - END')
6513         RETURN
6514         END
6515 C=======================================================================
6516 
6517         SUBROUTINE XXFZ(B,GZ)
6518 c Hadron-hadron and hadron-nucleus cross sections calculation
6519 c-----------------------------------------------------------------------
6520         IMPLICIT DOUBLE PRECISION (A-H,O-Z)
6521         INTEGER DEBUG
6522         DIMENSION GZ(2),FHARD(3)
6523         COMMON /Q_AREA1/  IA(2),ICZ,ICP
6524         COMMON /Q_AREA2/  S,Y0,WP0,WM0
6525         COMMON /Q_AREA7/  RP1
6526         COMMON /Q_AR13/    X1(7),A1(7)
6527         COMMON /Q_AREA43/ MONIOU
6528         COMMON /Q_DEBUG/  DEBUG
6529         SAVE
6530 
6531         IF(DEBUG.GE.2)WRITE (MONIOU,201)
6532 201     FORMAT(2X,'XXFZ - HADRONIC CROSS-SECTIONS CALCULATION')
6533 
6534         DO 1 L=1,2
6535 1       GZ(L)=0.D0
6536         E1=EXP(-1.D0)
6537 
6538         DO 2 I1=1,7
6539         DO 2 M=1,2
6540         Z=.5D0+X1(I1)*(M-1.5D0)
6541         S1=DSQRT(RP1*Z)
6542         ZV1=EXP(-Z)
6543         S2=DSQRT(RP1*(1.D0-DLOG(Z)))
6544         ZV2=E1*Z
6545 C??????????
6546 C       VV1=EXP(-PSFAZ(ZV1,FSOFT,FHARD,FSHARD))*(1.D0-FHARD(1)
6547 C    *  -FHARD(2)-FHARD(3))
6548 C       VV2=EXP(-PSFAZ(ZV2,FSOFT,FHARD,FSHARD))*(1.D0-FHARD(1)
6549 C    *  -FHARD(2)-FHARD(3))
6550 
6551         VV1=EXP(-PSFAZ(ZV1,FSOFT,FHARD,FSHARD)-FHARD(1)
6552      *  -FHARD(2)-FHARD(3))
6553         VV2=EXP(-PSFAZ(ZV2,FSOFT,FHARD,FSHARD)-FHARD(1)
6554      *  -FHARD(2)-FHARD(3))
6555 c???????????
6556 
6557         IF(IA(2).EQ.1)THEN
6558           CG1=1.D0
6559           CG2=1.D0
6560         ELSE
6561           CG1=XXROT(B,S1)
6562           CG2=XXROT(B,S2)
6563         ENDIF
6564 
6565         DO 2 L=1,2
6566 2       GZ(L)=GZ(L)+ A1(I1)*(CG1*(1.D0-VV1**L)+CG2*(1.D0-VV2**L)/Z)
6567         IF(DEBUG.GE.3)WRITE (MONIOU,202)
6568 202     FORMAT(2X,'XXFZ - END')
6569         RETURN
6570         END
6571 C=======================================================================
6572 
6573       SUBROUTINE XXGAU(GZ)
6574 c Impact parameter integration for impact parameters <BM -
6575 c for hadron-hadron and hadron-nucleus cross-sections calculation
6576 c-----------------------------------------------------------------------
6577       IMPLICIT DOUBLE PRECISION (A-H,O-Z)
6578       INTEGER DEBUG
6579       DIMENSION GZ(3),GZ0(3)
6580       COMMON /Q_AREA6/ PI,BM,AM
6581       COMMON /Q_AR13/   X1(7),A1(7)
6582       COMMON /Q_AR2/   R,RM
6583       COMMON /Q_AREA43/ MONIOU
6584       COMMON /Q_DEBUG/  DEBUG
6585       SAVE
6586 
6587         IF(DEBUG.GE.2)WRITE (MONIOU,201)
6588 201     FORMAT(2X,'XXGAU - NUCLEAR CROSS-SECTIONS CALCULATION')
6589 
6590       DO 1 I=1,3
6591 1     GZ(I)=0.D0
6592 
6593       DO 2 I=1,7
6594       DO 2 M=1,2
6595       B=BM*DSQRT(.5D0+X1(I)*(M-1.5D0))
6596       CALL XXFAU(B,GZ0)
6597       DO 2 L=1,3
6598 2     GZ(L)=GZ(L)+GZ0(L)*A1(I)
6599       DO 3 L=1,3
6600 3     GZ(L)=GZ(L)*(BM*AM)**2*PI*.5D0
6601         IF(DEBUG.GE.3)WRITE (MONIOU,202)
6602 202     FORMAT(2X,'XXGAU - END')
6603       RETURN
6604       END
6605 C=======================================================================
6606 
6607       SUBROUTINE XXGAU1(GZ)
6608 c Impact parameter integration for impact parameters >BM -
6609 c for hadron-hadron and hadron-nucleus cross-sections calculation
6610 c-----------------------------------------------------------------------
6611       IMPLICIT DOUBLE PRECISION (A-H,O-Z)
6612       INTEGER DEBUG
6613       DIMENSION GZ(3),GZ0(3)
6614       COMMON /Q_AREA6/ PI,BM,AM
6615       COMMON /Q_AR15/   X5(2),A5(2)
6616       COMMON /Q_AR2/   R,RM
6617       COMMON /Q_AREA43/ MONIOU
6618       COMMON /Q_DEBUG/  DEBUG
6619       SAVE
6620 
6621         IF(DEBUG.GE.2)WRITE (MONIOU,201)
6622 201     FORMAT(2X,'XXGAU1 - NUCLEAR CROSS-SECTIONS CALCULATION')
6623 
6624       DO 1 I=1,2
6625       B=BM+X5(I)
6626       CALL XXFAU(B,GZ0)
6627       DO 1 L=1,3
6628 1     GZ(L)=GZ(L)+GZ0(L)*A5(I)*EXP(X5(I))*B*2.D0*PI*AM*AM
6629         IF(DEBUG.GE.3)WRITE (MONIOU,202)
6630 202     FORMAT(2X,'XXGAU1 - END')
6631       RETURN
6632       END
6633 C=======================================================================
6634 
6635         SUBROUTINE XXGENER(WP0,WM0,EY0,S0X,C0X,S0,C0,IC1,IC2)
6636 c To simulate the fragmentation of the string into secondary hadrons
6637 c The algorithm conserves energy-momentum;
6638 c WP0, WM0 are initial longitudinal momenta ( E+p, E-p ) of the quarks
6639 c at the ends of the string; IC1, IC2 - their types
6640 c The following partons types are used: 1 - u, -1 - U, 2 - d, -2 - D,
6641 c 3 - ud, -3 - UD, 4 - s, -4 - S, 5 - c, -5 - C,
6642 c  6 - uu, 7 - dd, -6 - UU, -7 - DD
6643 c-----------------------------------------------------------------------
6644         IMPLICIT DOUBLE PRECISION (A-H,O-Z)
6645         INTEGER DEBUG
6646         CHARACTER *2 TYQ
6647         DIMENSION WP(2),IC(2),EPT(4),EP(4),EY(3),EY0(3)
6648 c WP(1), WP(2) - current longitudinal momenta of the partons at the string
6649 c ends, IC(1), IC(2) - their types
6650         COMMON /Q_AREA8/  WWM,BEP,BEN,BEK,BEC,DC(5),DETA,ALMPT
6651         COMMON /Q_AREA10/ STMASS,AM0,AMN,AMK,AMC,AMLAMC,AMLAM,AMETA
6652         COMMON /Q_AREA11/ B10
6653         COMMON /Q_AREA19/ AHL(5)
6654 ********************************************************
6655         COMMON /Q_AREA21/ DMMIN(5)
6656 ********************************************************
6657         COMMON /Q_AREA28/ ARR(4)
6658         COMMON /Q_AREA42/ TYQ(15)
6659         COMMON /Q_AREA43/ MONIOU
6660         COMMON /Q_DEBUG/  DEBUG
6661         SAVE
6662         EXTERNAL PSRAN
6663 
6664         IF(DEBUG.GE.2)WRITE (MONIOU,201)TYQ(8+IC1),TYQ(8+IC2),
6665      *  WP0,WM0,EY0,S0X,C0X,S0,C0
6666 201     FORMAT(2X,'XXGENER: PARTON FLAVORS AT THE ENDS OF THE STRING:',
6667      *  2X,A2,2X,A2/4X,'LIGHT CONE MOMENTA OF THE STRING: ',E10.3,
6668      *  2X,E10.3/4X,'EY0=',3E10.3/4X,
6669      *  'S0X=',E10.3,2X,'C0X=',E10.3,2X,'S0=',E10.3,2X,'C0=',E10.3)
6670 
6671         WW=WP0*WM0
6672         EPT(1)=.5D0*(