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c 07.06.2006 Link routines between QGSJet-II-03 and EPOS.
c author T. Pierog
c-----------------------------------------------------------------------
subroutine IniQGSJETII
c-----------------------------------------------------------------------
c Primary initialization for QGSJET-II
c-----------------------------------------------------------------------
parameter(iapmax=208)
include 'epos.inc'
integer debug
common /qgdebug/ debug
common /qgarr43/ moniou
double precision bqgs2,bmaxqgs,bmaxnex,bminnex,xan,xbn
common /qgsIInex1/xan(iapmax,3),xbn(iapmax,3)
*,bqgs2,bmaxqgs,bmaxnex,bminnex
CHARACTER DATDIR*(132)
call utpri('iniqgsII',ish,ishini,6)
write(ifmt,'(a,i6)')'initialize QGSJET-II ...'
debug=0
if(ish.ge.3)debug=ish-2
moniou=ifch
c model parameter setting
call qgset
c common initialization procedure
DATDIR="qgsjetII"
call qgaini(DATDIR)
BMAXNEX=dble(bmaxim)
BMINNEX=dble(bminim)
egymin=0.1
egymax=egymax
irescl=0
call utprix('iniqgsII',ish,ishini,6)
end
c-----------------------------------------------------------------------
subroutine IniEvtQGSII
c-----------------------------------------------------------------------
c Initialization for each type of event (for given proj, targ and egy)
c-----------------------------------------------------------------------
parameter(iapmax=208)
include 'epos.inc'
common/geom/rmproj,rmtarg,bmax,bkmx
c QGSJET-II Common
double precision bqgs,bmaxqgs,bmaxnex,bminnex,xa,xb,e0
common /qgsIInex1/xa(iapmax,3),xb(iapmax,3)
*,bqgs,bmaxqgs,bmaxnex,bminnex
if(matarg.gt.iapmax.or.maproj.gt.iapmax)
& call utstop('Nucleus too big for QGSJET-II (Mmax=208) !&')
call iclass(idproj,iclpro)
call iclass(idtarg,icltar)
icp=idtrafo('nxs','qgs',idproj)
if(icp.eq.0)icp=1-2*int(rangen()+0.5) !pi0=pi+ or p-
if(abs(icp).gt.5)
& call utstop('Projectile not allowed in QGSJET-II !&')
e0=dble(elab)
call qgini(e0,icp,maproj,matarg)
call qgini(e0,icp,maproj,matarg) !again to set bm properly
bmax=BMAXQGS
qgsIIincs=qgsIIcrse(ekin,maproj,matarg,idtarg)
if(engy.lt.egymin)qgsIIincs=0. !below egymin, no interaction
call xsigma !change bm in qgfz
bkmx=sqrt(sigine/10./pi) !10= fm^2 -> mb
if(ish.ge.2)write(ifch,*)
& 'QGSJET-II used with (E,proj,maproj,matarg,bmax)',e0,icp
& ,maproj,matarg,bmax
return
end
c-----------------------------------------------------------------------
subroutine emsqgsII(iret)
c-----------------------------------------------------------------------
c call qgsjet-II to simulate interaction
c-----------------------------------------------------------------------
parameter(iapmax=208,nptmax=95000)
include 'epos.inc'
include 'epos.incems'
common/geom/rmproj,rmtarg,bmax,bkmx
double precision bqgs,bmaxqgs,bmaxnex,bminnex,xa,xb,esp
common /qgsIInex1/xa(iapmax,3),xb(iapmax,3)
*,bqgs,bmaxqgs,bmaxnex,bminnex
common/nucl3/phi,bimp
common /qgarr12/ nsp
common /qgarr14/ esp(4,nptmax),ich(nptmax)
c nsf - number of secondary fragments;
c iaf(i) - mass of the i-th fragment
common /qgarr13/ nsf,iaf(iapmax)
common /qgarr55/ nwt,nwp
iret=0
b1=bminim
b2=min(bmax,bmaxim)
a=pi*(b2**2-b1**2)
if(a.gt.0..and.rangen().gt.qgsIIincs/10./a)goto 1001 !no interaction
if(ish.ge.3)call alist('Determine QGSJET-II Production&',0,0)
nptl=0
nsp=0
call qgconf
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)
phi=2.*pi*rangen()
phievt=phi
else
bimevt=0.
bimp=0.
phievt=0.
phi=0.
endif
anintine=anintine+1.
call conre
call conwr
call conqgsII
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 emsqgsII !'
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 qgsjetII ',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
c boost in CMS frame
call utlob5(yhaha, pptl(1,nptl), pptl(2,nptl)
. , pptl(3,nptl), pptl(4,nptl), pptl(5,nptl))
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-----------------------------------------------------------------------
subroutine conqgsII
c-----------------------------------------------------------------------
c determines interaction configuration
c-----------------------------------------------------------------------
include 'epos.inc'
include 'epos.incems'
common/geom/rmproj,rmtarg,bmax,bkmx
common/nucl3/phi,bimp
common /cncl/xproj(mamx),yproj(mamx),zproj(mamx)
* ,xtarg(mamx),ytarg(mamx),ztarg(mamx)
common/cncl2/diffbpr(mamx,mamx),diffbtg(mamx,mamx)
common/cncl3/iactpr(mamx),iacttg(mamx)
common/cfacmss/facmss
call utpri('cqgsII ',ish,ishini,4)
iret=0
c initialisations
c ---------------
vel=tanh(ypjtl-yhaha)+tanh(yhaha)
c determine phi, bimp, coll, iproj, itarg, x/y/zproj, x/y/ztarg
c ---------------------------------------------------------------
if(maproj.eq.1.and.matarg.eq.1)then
koll=1
do n=1,4
coord(n,1)=0.
enddo
bk(1)=bimp
iproj(1)=1
itarg(1)=1
phi=phievt
xproj(1)=bimp*cos(phi)
yproj(1)=bimp*sin(phi)
zproj(1)=0
xtarg(1)=0
ytarg(1)=0
ztarg(1)=0
lproj(1)=1
ltarg(1)=1
lproj3(1)=1
ltarg3(1)=1
kproj(1,1)=1
ktarg(1,1)=1
else
bx=0
by=0
if(maproj.gt.0)then
phi=phievt
bimp=bimevt
bx=cos(phi)*bimp
by=sin(phi)*bimp
endif
if(maproj.eq.0)goto 1000
koll=0
do i=1,maproj
lproj(i)=0
enddo
do j=1,matarg
ltarg(j)=0
enddo
do 12 i=1,maproj
do 11 j=1,matarg
bij=sqrt((xproj(i)+bx-xtarg(j))**2+(yproj(i)+by-ytarg(j))**2)
if(ish.ge.7)write(ifch,*)'i_p:',i,' i_t:',j,' b_ij:',bij
if(bij.gt.bkmx)goto 11
if(koll.ge.kollmx)goto 1000
koll=koll+1
bk(koll)=bij
bkx(koll)=xproj(i)+bx-xtarg(j)
bky(koll)=yproj(i)+by-ytarg(j)
iproj(koll)=i
itarg(koll)=j
lproj(i)=lproj(i)+1
ltarg(j)=ltarg(j)+1
kproj(i,lproj(i))=koll
ktarg(j,ltarg(j))=koll
11 continue
12 continue
do k=1,koll
do n=1,4
coord(n,k)=0.
enddo
enddo
endif
if(ish.ge.3)write(ifch,*)'koll=',koll
if(koll.eq.0)goto 1000
c determine coord
c ---------------
do kl=1,koll
i=iproj(kl)
j=itarg(kl)
dist=ztarg(j)-zproj(i)
coord(1,kl)=(xproj(i)+xtarg(j))*0.5
coord(2,kl)=(yproj(i)+ytarg(j))*0.5
coord(3,kl)=(zproj(i)+ztarg(j))*0.5
coord(4,kl)=dist/vel
enddo
c determine number of collisions according glauber model
c ------------
nglevt=koll
c exit
c ----
1000 continue
if(ish.ge.5)then
write(ifch,*)'ia,x/y/zproj:'
do mm=1,maproj
write(ifch,*)mm,iactpr(mm),xproj(mm),yproj(mm),zproj(mm)
enddo
write(ifch,*)'ia,x/y/ztarg:'
do mm=1,matarg
write(ifch,*)mm,iacttg(mm),xtarg(mm),ytarg(mm),ztarg(mm)
enddo
write(ifch,*)'iret',iret
endif
call utprix('cqgsII ',ish,ishini,4)
return
end
c------------------------------------------------------------------------------
function qgsIIcrse(egy,mapro,matar,id)
c------------------------------------------------------------------------------
c inelastic cross section of qgsjet-II
c (id=0 corresponds to air)
c egy - kinetic energy
c maproj - projec mass number (1<maproj<64)
c matarg - target mass number (1<matarg<64)
c------------------------------------------------------------------------------
include 'epos.inc'
double precision egyl,qgsect
qgsIIcrse=0.
call iclass(idproj,icpro)
call idmass(1120,amt1)
call idmass(1220,amt2)
amtar=0.5*(amt1+amt2)
if(matar.eq.1)amtar=amt1
if(mapro.eq.1)then
call idmass(idproj,ampro)
else
ampro=mapro*amtar
endif
egyl=dble(egy+ampro)
if(id.eq.0)then
do k=1,3
mt=int(airanxs(k))
qgsIIcrse=qgsIIcrse+airwnxs(k)*qgsect(egyl,icpro,mapro,mt)
enddo
else
qgsIIcrse=qgsect(egyl,icpro,mapro,matar)
endif
return
end
c--------------------------------------------------------------------
double precision function qgran(b10)
c--------------------------------------------------------------------
c Random number generator
c--------------------------------------------------------------------
include 'epos.inc'
double precision b10,drangen
qgran=drangen(b10)
if(irandm.eq.1)write(ifch,*)'qgran()= ',qgran
return
end
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