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c 25.04.2003 Link routines between QGSJet and epos.
c author T. Pierog
c-----------------------------------------------------------------------
subroutine IniQGSJet
c-----------------------------------------------------------------------
c Primary initialization for QGSJet
c-----------------------------------------------------------------------
include 'epos.inc'
COMMON /Q_DEBUG/ DEBUG
COMMON /Q_AREA43/ MONIOU
integer debug
double precision BQGS,BMAXQGS,BMAXNEX,BMINNEX,XA(210,3),XB(210,3)
COMMON /Q_QGSNEX1/ XA,XB,BQGS,BMAXQGS,BMAXNEX,BMINNEX !ctp
call utpri('iniqgs',ish,ishini,6)
write(ifmt,'(a,i6)')'initialize QGSJet ...'
debug=0
if(ish.ge.3)debug=ish-2
moniou=ifch
c common model parameters setting
call psaset
c particular model parameters setting
call xxaset
c common initialization procedure
call qgspsaini
BMAXNEX=dble(bmaxim)
BMINNEX=dble(bminim)
egymin=0.1
egymax=egymax
irescl=0
call utprix('iniqgs',ish,ishini,6)
end
c-----------------------------------------------------------------------
subroutine IniEvtQGS
c-----------------------------------------------------------------------
c Initialization for each type of event (for given proj, targ and egy)
c-----------------------------------------------------------------------
include 'epos.inc'
common/geom/rmproj,rmtarg,bmax,bkmx
c QGSJet Common
double precision XA(210,3),XB(210,3),BQGS,BMAXQGS,BMAXNEX,BMINNEX
& ,e0
COMMON /Q_QGSNEX1/ XA,XB,BQGS,BMAXQGS,BMAXNEX,BMINNEX
if(matarg.gt.210.or.maproj.gt.210)
& call utstop('Nucleus too big for QGSJet (Mmax=210) !&')
call iclass(idproj,iclpro)
call iclass(idtarg,icltar)
e0=dble(elab)
icp=idtrafo('nxs','qgs',idproj)
if(icp.eq.0)icp=1-2*int(rangen()+0.5) !pi0=pi+ or p-
call xxaini(e0,icp,maproj,matarg)
bmax=BMAXQGS
qgsincs=fqgscrse(ekin,maproj,matarg)
if(engy.lt.egymin)qgsincs=0. !below egymin, no interaction
call xsigma
bkmx=sqrt(sigine/10./pi) !10= fm^2 -> mb
if(ish.ge.2)write(ifch,*)
& 'QGSJet used with (E,proj,maproj,matarg,bmax)',e0,icp,maproj
& ,matarg,bmax
return
end
c-----------------------------------------------------------------------
subroutine emsqgs(iret)
c-----------------------------------------------------------------------
c call qgsjet to simulate interaction
c-----------------------------------------------------------------------
include 'epos.inc'
include 'epos.incems'
common/geom/rmproj,rmtarg,bmax,bkmx
double precision XA(210,3),XB(210,3),BQGS,BMAXQGS,BMAXNEX,BMINNEX
COMMON /Q_QGSNEX1/ XA,XB,BQGS,BMAXQGS,BMAXNEX,BMINNEX
common/nucl3/phi,bimp
common /q_area12/ nsp
common /q_area14/ esp(4,95000),ich(95000)
double precision esp
c NSF - number of secondary fragments;
c IAF(i) - mass of the i-th fragment
COMMON /Q_AREA13/ NSF,IAF(210)
COMMON /Q_AREA99/ NWT
iret=0
b1=bminim
b2=min(bmax,bmaxim)
a=pi*(b2**2-b1**2)
if(a.gt.0..and.rangen().gt.qgsincs/10./a)goto 1001 !no interaction
if(ish.ge.3)call alist('Determine QGSJet Production&',0,0)
nptl=0
nsp=0
call psconf
nevt=1
kolevt=-1
koievt=-1
kohevt=-1
npjevt=maproj
ntgevt=matarg
pmxevt=pnll
egyevt=engy
if(BQGS.ge.0.d0)then
bimevt=real(BQGS)
bimp=real(BQGS)
phievt=2.*pi*rangen()
else
bimevt=0.
bimp=0.
phievt=0.
endif
anintine=anintine+1.
call conre
call conwr
c keep the projectile spectators as fragments
npns=0
npps=0
ns=0
if(infragm.eq.2)then
if(NSF.gt.0)then
do is=1,NSF !count the number of spectators
if(ish.ge.7)write(ifch,'(a,i5,a,i5)')
$ ' Projecticle Fragment ',is,' Mass :',IAF(is)
nptl=nptl+1
istptl(nptl)=0
if(IAF(is).eq.1)then
id=idptl(is)
pptl(3,nptl)=pptl(3,is)
pptl(4,nptl)=pptl(4,is)
pptl(5,nptl)=pptl(5,is)
if(id.eq.1120)npps=npps+1
if(id.eq.1220)npns=npns+1
else
if(IAF(is).eq.2)then
id=17
npps=npps+1
npns=npns+1
elseif(IAF(is).eq.3)then
id=18
npps=npps+1
npns=npns+2
elseif(IAF(is).eq.4)then
id=19
npps=npps+2
npns=npns+2
else
inucl=IAF(is)
iprot= int(dble(inucl) / 2.15d0 + 0.7d0)
id=1000000000+iprot*10000+inucl*10 !code for nuclei
npps=npps+iprot
npns=npns+inucl-iprot
endif
call idmass(id,am)
pptl(4,nptl)=dble(IAF(is))*pptl(4,is) !Etot
pptl(5,nptl)=am !mass
pz2tmp=(pptl(4,nptl)+am)*(pptl(4,nptl)-am)
if(pz2tmp.gt.0.d0)then
pptl(3,nptl)=sqrt(pz2tmp) !Pz
else
write(*,*)'Warning in emsqgs !'
write(*,*)'energy of fragment too small :',IAF(is),am
& ,pptl(4,nptl)
pptl(3,nptl)=pptl(4,nptl)
endif
endif
pptl(1,nptl)=0.d0 !P_x
pptl(2,nptl)=0.d0 !P_y
ityptl(nptl)=0
iorptl(nptl)=1
jorptl(nptl)=maproj+matarg
ifrptl(1,nptl)=0
ifrptl(2,nptl)=0
xorptl(1,nptl)=0.d0
xorptl(2,nptl)=0.d0
xorptl(3,nptl)=0.d0
xorptl(4,nptl)=0.d0
tivptl(1,nptl)=0.d0
tivptl(2,nptl)=0.d0
idptl(nptl)=id
if(ish.ge.5)write(ifch,'(a,i5,a,i5,a,4(e10.4,1x),f6.3)')
$ ' Fragment from qgsjet ',nptl,' id :',idptl(nptl)
$ , ' momentum :',(pptl(k,nptl),k=1,5)
enddo
endif
c make the projectile spectators as free nucleons
else
ns=0
if(NSF.gt.0)then
do is=1,NSF !count the number of spectators
ns=ns+IAF(is)
enddo
if(infragm.eq.1)then
c remaining nucleus is one fragment
nptl=nptl+1
istptl(nptl)=0
pptl(1,nptl)=0.d0
pptl(2,nptl)=0.d0
pptl(4,nptl)=0.d0
inucl=0
do is=1,ns
inucl=inucl+1
pptl(4,nptl)=pptl(4,nptl)+pptl(4,is)
enddo
iprot= int(dble(inucl) / 2.15d0 + 0.7d0)
idnucl=1000000000+iprot*10000+inucl*10 !code for nuclei
npps=npps+iprot
npns=npns+inucl-iprot
call idmass(idnucl,am)
pptl(5,nptl)=am !mass
ptot=(pptl(4,nptl)+am)*(pptl(4,nptl)-am)
pptl(3,nptl)=sqrt(ptot)
ityptl(nptl)=0
istptl(nptl)=0
iorptl(nptl)=1
jorptl(nptl)=maproj
ifrptl(1,nptl)=0
ifrptl(2,nptl)=0
xorptl(1,nptl)=xorptl(1,1)
xorptl(2,nptl)=xorptl(2,1)
xorptl(3,nptl)=xorptl(3,1)
xorptl(4,nptl)=xorptl(4,1)
tivptl(1,nptl)=tivptl(1,1)
tivptl(2,nptl)=tivptl(2,1)
idptl(nptl)=idnucl
else
do is=maproj-ns+1,maproj !make the ns last projectile nucleon final
if(idptl(is).eq.1120)npps=npps+1
if(idptl(is).eq.1220)npns=npns+1
enddo
endif
endif
endif
c number of participants
if(laproj.gt.1)then
npjevt=maproj-npps-npns
npppar=max(0,laproj-npps)
npnpar=npjevt-npppar
c set participant projectile as non spectators
do i=1,maproj
if(idptl(i).eq.1120)then
if(npppar.gt.0)then
npppar=npppar-1
else !restore spectators
iorptl(i)=0
if(infragm.eq.0)istptl(i)=0
endif
endif
if(idptl(i).eq.1220)then
if(npnpar.gt.0)then
npnpar=npnpar-1
else !restore spectators
iorptl(i)=0
if(infragm.eq.0)istptl(i)=0
endif
endif
enddo
endif
c restore target spectators
ns=0
if(NWT.lt.matarg)then
c number of participants
ntgevt=NWT
do is=ntgevt+1,matarg !make the last target nucleon final
iorptl(maproj+is)=0
istptl(maproj+is)=0
enddo
endif
do is=1,nsp
c ich is the type of secondary hadron, esp - its transverse momentum,
c and its energy
c the following notations for the particles types are used: 0 - pi0, 1 -
c pi+,
c -1 - pi-, 2 - p, -2 - p, 3 - n, -3 - n, 4 - k+, -4 - k-, 5 - k0s, -5 -
c k0l
ic=ich(is)
if(ish.ge.7)write(ifch,'(a,i5,a,i5,2a,4(e10.4,1x))')
$ ' qgsjet particle ',is,' id :',ic,' before conversion'
$ , ' momentum :',(esp(k,is),k=1,4)
nptl=nptl+1
if(nptl.gt.mxptl)call utstop('qgsjet: mxptl too small&')
id=idtrafo('qgs','nxs',ic)
if(ish.ge.7)write(ifch,'(a,i5,a,i5,a)')
$ ' epos particle ',nptl,' id :',id,' after conversion'
call idmass(id,am)
pptl(1,nptl)=real(esp(3,is)) !P_x
pptl(2,nptl)=real(esp(4,is)) !P_y
pptl(3,nptl)=real(esp(2,is)) !P_z
pptl(4,nptl)=real(esp(1,is)) !E
pptl(5,nptl)=am !mass
istptl(nptl)=0
ityptl(nptl)=0
iorptl(nptl)=1
jorptl(nptl)=maproj+matarg
ifrptl(1,nptl)=0
ifrptl(2,nptl)=0
xorptl(1,nptl)=0.
xorptl(2,nptl)=0.
xorptl(3,nptl)=0.
xorptl(4,nptl)=0.
tivptl(1,nptl)=0.
tivptl(2,nptl)=0.
idptl(nptl)=id
if(noebin.lt.0)pptl(3,nptl)=-pptl(3,nptl) !exchange projectile <-> target side in case of fake DIS
if(ish.ge.5)write(ifch,'(a,i5,a,i5,a,4(e10.4,1x),f6.3)')
$ ' particle from qgsjet ',nptl,' id :',idptl(nptl)
$ , ' momentum :',(pptl(k,nptl),k=1,5)
enddo
1000 return
1001 iret=-1
goto 1000
end
c------------------------------------------------------------------------------
function fqgscrse(ek,mapr,matg)
c------------------------------------------------------------------------------
c hadron-nucleus (hadron-proton) and nucl-nucl particle production cross section
c with qgsjet.
c ek - kinetic lab energy
c maproj - projec mass number (1<maproj<210)
c matarg - target mass number (1<matarg<210)
c------------------------------------------------------------------------------
dimension wk(3),wa(3),wb(3)
include 'epos.inc'
double precision gsect,qgsasect
COMMON /Q_XSECT/ GSECT(10,5,4)
COMMON /Q_AREA48/ QGSASECT(10,6,4)
fqgscrse=0.
call idmass(1120,amt1)
call idmass(1220,amt2)
amtar=0.5*(amt1+amt2)
if(matg.eq.1)amtar=amt1
if(mapr.eq.1)then
call idmass(idproj,ampro)
else
ampro=mapr*amtar
endif
egy=ek+ampro
ye=max(1.,log10(egy))
je=min(8,int(ye))
wk(2)=ye-je
wk(3)=wk(2)*(wk(2)-1.)*.5
wk(1)=1.-wk(2)+wk(3)
wk(2)=wk(2)-2.*wk(3)
ya=real(matg)
ya=log(ya)/1.38629+1.
ja=min(int(ya),2)
wa(2)=ya-ja
wa(3)=wa(2)*(wa(2)-1.)*.5
wa(1)=1.-wa(2)+wa(3)
wa(2)=wa(2)-2.*wa(3)
if(mapr.eq.1)then
do i=1,3
do m=1,3
fqgscrse=fqgscrse+real(gsect(je+i-1,iclpro,ja+m-1))*wk(i)*wa(m)
enddo
enddo
else
yb=mapr
yb=log(yb/2.)/.69315+1.
jb=min(int(yb),4)
wb(2)=yb-jb
wb(3)=wb(2)*(wb(2)-1.)*.5
wb(1)=1.-wb(2)+wb(3)
wb(2)=wb(2)-2.*wb(3)
do i=1,3
do m=1,3
do n=1,3
fqgscrse=fqgscrse+real(qgsasect(je+i-1,jb+n-1,ja+m-1)
& *wk(i)*wa(m)*wb(n))
enddo
enddo
enddo
endif
fqgscrse=exp(fqgscrse)
return
end
c------------------------------------------------------------------------------
function qgscrse(egy,mapro,matar,id)
c------------------------------------------------------------------------------
c inelastic cross section of qgsjet
c (id=0 corresponds to air)
c egy - kintetic energy
c maproj - projec mass number (1<maproj<210)
c matarg - target mass number (1<matarg<210)
c------------------------------------------------------------------------------
include 'epos.inc'
qgscrse=0.
if(id.eq.0)then
do k=1,3
mt=int(airanxs(k))
qgscrse=qgscrse+airwnxs(k)*fqgscrse(egy,mapro,mt)
enddo
else
qgscrse=fqgscrse(egy,mapro,matar)
endif
return
end
c--------------------------------------------------------------------
double precision function psran(b10)
c--------------------------------------------------------------------
c Random number generator
c--------------------------------------------------------------------
double precision b10,drangen
include 'epos.inc'
psran=drangen(b10)
if(irandm.eq.1)write(ifch,*)'psran()= ',psran
return
end
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