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c*******************************************************
c*******************************************************
subroutine evntinit
implicit double precision(a-h, o-z)
implicit integer(i-n)
#include "invegas.h"
#include "bcvegpy_set_par.inc"
c...three pythia functions return integers, so need declaring.
integer pycomp
c...external statement.
external pydata,totfun
c****************************************************
c*************** define most of the common block used
c****************************************************
c...pythia common block.
common/pyjets/n,npad,k(4000,5),p(4000,5),v(4000,5)
parameter (maxnup=500)
common/hepeup/nup,idprup,xwgtup,scalup,aqedup,aqcdup,idup(maxnup),
&istup(maxnup),mothup(2,maxnup),icolup(2,maxnup),pup(5,maxnup),
&vtimup(maxnup),spinup(maxnup)
save /hepeup/
parameter (maxpup=100)
integer pdfgup,pdfsup,lprup
common/heprup/idbmup(2),ebmup(2),pdfgup(2),pdfsup(2),
&idwtup,nprup,xsecup(maxpup),xerrup(maxpup),xmaxup(maxpup),
&lprup(maxpup)
save /heprup/
c...user process event common block.
common/pypars/mstp(200),parp(200),msti(200),pari(200)
common/pydat1/mstu(200),paru(200),mstj(200),parj(200)
common/pydat3/mdcy(500,3),mdme(8000,2),brat(8000),kfdp(8000,5)
double complex colmat,bundamp
common/upcom/ecm,pmbc,pmb,pmc,fbcc,pmomup(5,8),
& colmat(10,64),bundamp(4),pmomzero(5,8)
common/counter/ibcstate,nev
common/grade/xi(NVEGBIN,10)
common/vegcross/vegsec,vegerr,iveggrade
common/colflow/amp2cf(10),smatval
c...transform of running information.
common/ptpass/ptmin,ptmax,crossmax,etamin,etamax,
& smin,smax,ymin,ymax,psetamin,psetamax
common/confine/ptcut,etacut
common/histcol/inx
c...generate---switch for full events. vegasopen---switch for using
c...vegas.
logical generate,vegasopen,usegrade
common/genefull/generate
c...parameters transformtion.
common/funtrans/nq2,npdfu
common/usertran/ishower,idpp
c...transform of the vegas information
common/vegasinf/number,nitmx
c...to get the subprocess cross-section.
common/subopen/subfactor,subenergy,isubonly
c...to get the distribution of an extra factor z=(2(k1+k2).p_bc)/shat.
common/extraz/zfactor,zmin,zmax
common/outpdf/ioutpdf,ipdfnum
c...used in grv98l
common/intinip/iinip
common/intinif/iinif
c...transform some variables
common/loggrade/ievntdis,igenerate,ivegasopen,igrade
c...for transform the subprocess information, i.e., whether using
c...the subprocess q\bar{q}->bc+b+\bar{c} to generate events.
common/qqbar/iqqbar,iqcode
dimension nfin(20),alamin(20)
common/coloct/ioctet
common/octmatrix/coeoct
c...transform the first derivative of the wavefunction at the zero or the
c...wavefunction at the zero.
common/wavezero/fbc
c...data:lambda and n_f values for parton distributions. this is obtained
c...from pythia and used for vegas running.
data alamin/0.177d0,0.239d0,0.247d0,0.2322d0,0.248d0,0.248d0,
&0.192d0,0.326d0,2*0.2d0,0.2d0,0.2d0,0.29d0,0.2d0,0.4d0,5*0.2d0/,
&nfin/20*4/
c...xbcsec(8) records the total differential cross-sections for different
c...states: 1---singlet 1s0; 2---singlet 3s1; 7---octet 1s0; 8---octet 3s1;
c...3---singlet 1p1; 4---singlet 3p0; 5---singlet 3p1; 6---singlet 3p2.
common/mixevnt/xbcsec(8),imix,imixtype
common/mixevnt2/xbcsum,ibclimit
character*1 pfile
c************************************************
c... open recording files.--record mainly the
c... vegas running information
c************************************************
call upopenfile(imix,imixtype,ibcstate,ioctet)
c************************************************
generate =.false.
if(igenerate.eq.1) generate =.true.
vegasopen=.false.
if(ivegasopen.eq.1) vegasopen=.true.
usegrade=.false.
if(igrade.eq.1) usegrade=.true.
if(isubonly.eq.1) subfactor=subenergy/ecm
c--------------------------------------------
c...reference light-like momentum, which can be choosing arbitrarily.
c...this can be used to check tht rightness of the program.
c...--used only for s-wave gluon fusion mechanism.
pmomup(1,8)=3.0d0
pmomup(2,8)=4.0d0
pmomup(3,8)=5.0d0
pmomup(4,8)=dsqrt(pmomup(1,8)**2+pmomup(2,8)**2+pmomup(3,8)**2)
pmomup(5,8)=0.0d0
c--------------------------------------------
c...output program logo.
call uplogo
c--------------------------------------------
c...setting the alphas.
c mstu(111)=0---fixed; d=1---fir order; =2---sec order
mstp(2) =mstu(111)
c---------------------------------------------------------
c...choose lambda value to be used in case of using vegas.
if(vegasopen) then
if(ioutpdf.eq.0) then
c...this part is from the inner part of pythia.
if(mstp(51).ge.1 .and. mstp(51).le.20) then
paru(112)=alamin(mstp(51))
mstu(112)=nfin(mstp(51))
end if
else
if(ipdfnum.eq.100) then
paru(112)=0.1750d0 !grv98l
mstu(112)=4
end if
if(ipdfnum.eq.200) then
paru(112)=0.220d0 !msrt2001l
mstu(112)=4
end if
if(ipdfnum.eq.300) then
paru(112)=0.215d0 !cteq6l1
mstu(112)=4
end if
end if
end if
c---------------------------------
c...logo for vegas.
call vegaslogo(vegasopen)
c******************************************************************
c...using vegas to get the importance function and then the
c...sampling stratage: xi(), which will be stored in grade files.
c******************************************************************
if(vegasopen) then
if(isubonly.eq.0) then
if(imix.eq.0) then
c--------------------------------------
c... using existed grade to generate more precise grade.
c... this way is only used for imix=0 (preferable);
c... for imix=1, the way is the same,
c... but is tedious to write all of them here.
c--------------------------------------
if(iveggrade.eq.1) then
write(*,'(a)')'existed grade to gene. more precise grade.'
write(3,'(a)')'existed grade to gene. more precise grade.'
do i=1,NVEGBIN
read(11,*) (xi(i,j),j=1,7)
end do
c open(unit=29,file='data/newgrade.grid',status='unknown')
open(unit=29,file='newgrade.grid',status='unknown')
end if
call vegas(totfun,7,number,nitmx,2)
do i=1,NVEGBIN
if(iveggrade.eq.1) then
write(29,*) (xi(i,j),j=1,7)
else
write(11,*) (xi(i,j),j=1,7)
end if
end do
end if
c******************************************************
if(imix.eq.1) then
if(imixtype.eq.1.or.imixtype.eq.2) then
ibcstate=1 !1s0 and singlet
write(*,'(a)') '...generating cross-sec and grade (1s0)...'
write(3,'(a)') '...generating cross-sec and grade (1s0)...'
call paraswave(ibcstate)
call vegas(totfun,7,number,nitmx,2)
xbcsec(1)=vegsec
do i=1,NVEGBIN
write(36,*) (xi(i,j),j=1,7)
end do
write(36,*) '+'
write(36,*) vegsec,crossmax
rewind(36)
end if
c********************************
if(imixtype.eq.1.or.imixtype.eq.2) then
ibcstate=2 !3s1 and singlet
write(*,'(a)') '...generating cross-sec and grade (3s1)...'
write(3,'(a)') '...generating cross-sec and grade (3s1)...'
call paraswave(ibcstate)
call vegas(totfun,7,number,nitmx,2)
xbcsec(2)=vegsec
do i=1,NVEGBIN
write(37,*) (xi(i,j),j=1,7)
end do
write(37,*) '+'
write(37,*) vegsec,crossmax
rewind(37)
end if
c********************************
if(imixtype.eq.1.or.imixtype.eq.3) then
ibcstate=3
write(*,'(a)') '...generating cross-sec and grade (1p1)...'
write(3,'(a)') '...generating cross-sec and grade (1p1)...'
call parapwave
call vegas(totfun,7,number,nitmx,2)
xbcsec(3)=vegsec
do i=1,NVEGBIN
write(38,*) (xi(i,j),j=1,7)
end do
write(38,*) '+'
write(38,*) vegsec,crossmax
rewind(38)
end if
c********************************
if(imixtype.eq.1.or.imixtype.eq.3) then
ibcstate=4
write(*,'(a)') '...generating cross-sec and grade (3p0)...'
write(3,'(a)') '...generating cross-sec and grade (3p0)...'
call parapwave
call vegas(totfun,7,number,nitmx,2)
xbcsec(4)=vegsec
do i=1,NVEGBIN
write(39,*) (xi(i,j),j=1,7)
end do
write(39,*) '+'
write(39,*) vegsec,crossmax
rewind(39)
end if
c********************************
if(imixtype.eq.1.or.imixtype.eq.3) then
ibcstate=5
write(*,'(a)') '...generating cross-sec and grade (3p1)...'
write(3,'(a)') '...generating cross-sec and grade (3p1)...'
call parapwave
call vegas(totfun,7,number,nitmx,2)
xbcsec(5)=vegsec
do i=1,NVEGBIN
write(46,*) (xi(i,j),j=1,7)
end do
write(46,*) '+'
write(46,*) vegsec,crossmax
rewind(46)
end if
c********************************
if(imixtype.eq.1.or.imixtype.eq.3) then
ibcstate=6
write(*,'(a)') '...generating cross-sec and grade (3p2)...'
write(3,'(a)') '...generating cross-sec and grade (3p2)...'
call parapwave
call vegas(totfun,7,number,nitmx,2)
xbcsec(6)=vegsec
do i=1,NVEGBIN
write(47,*) (xi(i,j),j=1,7)
end do
write(47,*) '+'
write(47,*) vegsec,crossmax
rewind(47)
end if
c********************************
if(imixtype.eq.1.or.imixtype.eq.3) then
ibcstate=7 !1s0 and octet
write(*,'(a)') '.generating cross-sec and grade (1s0)_8...'
write(3,'(a)') '.generating cross-sec and grade (1s0)_8...'
call paraswave(ibcstate)
ibcstate=1 !return to original definition
call vegas(totfun,7,number,nitmx,2)
xbcsec(7)=vegsec
do i=1,NVEGBIN
write(48,*) (xi(i,j),j=1,7)
end do
write(48,*) '+'
write(48,*) vegsec,crossmax
rewind(48)
end if
c********************************
if(imixtype.eq.1.or.imixtype.eq.3) then
ibcstate=8 !3s1 and octet
write(*,'(a)') '.generating cross-sec and grade (3s1)_8...'
write(3,'(a)') '.generating cross-sec and grade (3s1)_8...'
call paraswave(ibcstate)
ibcstate=2 !return to original definition
call vegas(totfun,7,number,nitmx,2)
do i=1,NVEGBIN
write(49,*) (xi(i,j),j=1,7)
end do
xbcsec(8)=vegsec
write(49,*) '+'
write(49,*) vegsec,crossmax
rewind(49)
end if
end if
else
write(*,'(a,a,1x,g12.5)')'getting subprocess info....',
& 'at c.m. energy(gev)',subenergy
write(3,'(a,a,1x,g12.5)')'getting subprocess info....',
& 'at c.m. energy(gev)',subenergy
write(*,'(a)') 'the info. of hadron collider is no use!!!'
write(3,'(a)') 'the info. of hadron collider is no use!!!'
if(iveggrade.eq.1) then
write(*,'(a)')'using existed grade to gene. precise grade.'
write(3,'(a)')'using existed grade to gene. precise grade.'
do i=1,NVEGBIN
read(11,*) (xi(i,j),j=1,7)
end do
c open(unit=29,file='data/newgrade.grid',status='unknown')
open(unit=29,file='newgrade.grid',status='unknown')
end if
ndim=5
call vegas(totfun,ndim,number,nitmx,2)
c...record the (new) generated grade.
do i=1,NVEGBIN
if(iveggrade.eq.1) then
write(29,*) (xi(i,j),j=1,ndim)
else
write(11,*) (xi(i,j),j=1,ndim)
end if
end do
end if
call vegasend(vegasopen,ievntdis,usegrade)
else
call vegasend(vegasopen,ievntdis,usegrade)
if(isubonly.eq.0) then
ndim=7
else
ndim=5
write(*,'(a)')'getting the info. of the subporcess....'
write(3,'(a)')'getting the info. of the subporcess....'
end if
c...initialize the grade.
rc=1.0d0/NVEGBIN
do 77 j=1,ndim
xi(NVEGBIN,j)=1.0d0
dr=0.0d0
do 77 i=1,NVEGBIN-1
dr=dr+rc
xi(i,j)=dr
77 continue
c*****************************************************************
c...using the existed grade. one thing should be care here is that
c...the existed grade should be formed under the same parameters.
if(imix.eq.0) then
if(usegrade) then
write(*,'(a)') 'using the existed vegas grade.'
write(3,'(a)') 'using the existed vegas grade.'
do i=1,NVEGBIN
read(11,*) (xi(i,j),j=1,7)
end do
end if
end if
end if
c********************************************
c*** find the total-corssection for each state
c*** from the previous generated grade, used
c*** when vegas not used.
c********************************************
if(imix.eq.1 .and. (.not.vegasopen)) then
if(imixtype.eq.1) then
do i=1,4
do
read(36+i-1,*) pfile
if(pfile.eq.'+') exit
enddo
read(36+i-1,*) xbcsec(i)
rewind(36+i-1)
enddo
do i=1,4
do
read(46+i-1,*) pfile
if(pfile.eq.'+') exit
enddo
read(46+i-1,*) xbcsec(4+i)
rewind(46+i-1)
enddo
end if
c---------------------------------------
if(imixtype.eq.2) then
do i=1,2
do
read(36+i-1,*) pfile
if(pfile.eq.'+') exit
enddo
read(36+i-1,*) xbcsec(i)
rewind(36+i-1)
enddo
end if
c----------------------------------------
if(imixtype.eq.3) then
do i=3,4
do
read(36+i-1,*) pfile
if(pfile.eq.'+') exit
enddo
read(36+i-1,*) xbcsec(i)
rewind(36+i-1)
enddo
do i=1,4
do
read(46+i-1,*) pfile
if(pfile.eq.'+') exit
enddo
read(46+i-1,*) xbcsec(4+i)
rewind(46+i-1)
enddo
end if
end if
c*******************************************
if(imix.eq.1) then
if(imixtype.eq.1) then
xbcsum=0.0d0
do i=1,8
xbcsum=xbcsum+xbcsec(i)
end do
ibclimit=8
end if
if(imixtype.eq.2) then
xbcsum=0.0d0
do i=1,2
xbcsum=xbcsum+xbcsec(i)
end do
ibclimit=2
end if
if(imixtype.eq.3) then
xbcsum=0.0d0
do i=3,8
xbcsum=xbcsum+xbcsec(i)
end do
ibclimit=8
end if
end if
crossmax=0.0d0
c***************************************************
c*** some switches for event generation *****
c***************************************************
c...switch off aspects: initial and final state
c...showers, multiple interactions, hadronization.
if(ishower.eq.0) then
mstp(61) =0
mstp(71) =0
mstp(81) =0
mstp(111)=0
end if
c...expanded event listing (required for histogramming).
mstp(125)=2
c...pyinit--->to initialize the generation procedure.
call pyinit('user',' ',' ',0d0)
c...set bc+ stable.
mdcy(pycomp(541),1)=0
c***************************************************
return
end
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