/*
$Log$
+Revision 1.8 2001/04/20 10:10:25 coppedis
+Minor changes
+
+Revision 1.7 2001/03/15 16:13:28 coppedis
+Code review
+
+Revision 1.6 2000/11/30 17:16:14 coppedis
+Changes suggested by fca
+
+Revision 1.5 2000/11/22 11:30:12 coppedis
+Major code revision
+
Revision 1.4 2000/10/05 08:02:47 fca
Correction of the generator direction
#include "AliConst.h"
#include "AliPDG.h"
#include "AliRun.h"
+#include "AliMCProcess.h"
ClassImp(AliGenZDC)
fCosy = 0.;
fCosz = 1.;
fPseudoRapidity = 0.;
+
fFermiflag = 1;
// LHC values for beam divergence and crossing angle
fBeamDiv = 0.000032;
fBeamCrossAngle = 0.0001;
fBeamCrossPlane = 2;
+
+ Int_t i, j;
+ for(i=0; i<201; i++){
+ fProbintp[i] = 0;
+ fProbintn[i] = 0;
+ }
+ for(j=0; j<3; j++){
+ fPp[i] = 0;
+ }
+ fDebugOpt = 0;
}
//_____________________________________________________________________________
void AliGenZDC::Init()
{
- printf(" AliGenZDC initialized with:\n");
+ printf("\n\n AliGenZDC initialized with:\n");
printf(" Fermi flag = %d, Beam Divergence = %f, Crossing Angle "
"= %f, Crossing Plane = %d\n\n", fFermiflag, fBeamDiv, fBeamCrossAngle,
fBeamCrossPlane);
+
//Initialize Fermi momentum distributions for Pb-Pb
FermiTwoGaussian(207.,82.,fPp,fProbintp,fProbintn);
}
//
Int_t i;
- Double_t mass, pLab[3], fP0, ddp[3], dddp0, dddp[3];
- Float_t ptot = fPMin;
+ Double_t Mass, pLab[3], fP0, fP[3], fBoostP[3], ddp[3], dddp0, dddp[3];
+ Float_t fPTrack[3], ptot = fPMin;
Int_t nt;
if(fPseudoRapidity==0.){
pLab[2] = ptot*TMath::Cos(scang);
}
for(i=0; i<=2; i++){
- fPInit[i] = pLab[i];
fP[i] = pLab[i];
}
+
// Beam divergence and crossing angle
if(fBeamCrossAngle!=0.) {
BeamDivCross(1,fBeamDiv,fBeamCrossAngle,fBeamCrossPlane,pLab);
if((fIpart==kProton) || (fIpart==kNeutron)){
ExtractFermi(fIpart,fPp,fProbintp,fProbintn,ddp);
}
- mass=gAlice->PDGDB()->GetParticle(fIpart)->Mass();
- fP0 = TMath::Sqrt(fP[0]*fP[0]+fP[1]*fP[1]+fP[2]*fP[2]+mass*mass);
+ Mass=gAlice->PDGDB()->GetParticle(fIpart)->Mass();
+ fP0 = TMath::Sqrt(fP[0]*fP[0]+fP[1]*fP[1]+fP[2]*fP[2]+Mass*Mass);
for(i=0; i<=2; i++){
dddp[i] = ddp[i];
}
- dddp0 = TMath::Sqrt(dddp[0]*dddp[0]+dddp[1]*dddp[1]+dddp[2]*dddp[2]+mass*mass);
+ dddp0 = TMath::Sqrt(dddp[0]*dddp[0]+dddp[1]*dddp[1]+dddp[2]*dddp[2]+Mass*Mass);
TVector3 b(fP[0]/fP0, fP[1]/fP0, fP[2]/fP0);
TLorentzVector pFermi(dddp[0], dddp[1], dddp[2], dddp0);
-
pFermi.Boost(b);
-
for(i=0; i<=2; i++){
fBoostP[i] = pFermi[i];
fP[i] = pFermi[i];
}
Float_t polar[3] = {0,0,0};
-// printf("fPTrack = %f, %f, %f \n",fPTrack[0],fPTrack[1],fPTrack[2]);
gAlice->SetTrack(fTrackIt,-1,fIpart,fPTrack,fOrigin.GetArray(),polar,0,
- "Primary",nt);
+ kPPrimary,nt);
+ if(fDebugOpt == 1){
+ printf("\n\n Track momentum:\n");
+ printf("\n fPTrack = %f, %f, %f \n",fPTrack[0],fPTrack[1],fPTrack[2]);
+ }
}
//_____________________________________________________________________________
-void AliGenZDC::FermiTwoGaussian(Double_t A, Float_t Z, Double_t* fPp, Double_t*
- fProbintp, Double_t* fProbintn)
+void AliGenZDC::FermiTwoGaussian(Float_t A, Float_t Z, Double_t *fPp,
+ Double_t *fProbintp, Double_t *fProbintn)
{
//
// Momenta distributions according to the "double-gaussian"
// distribution (Ilinov) - equal for protons and neutrons
//
-// printf(" Initialization of Fermi momenta distribution\n");
+
fProbintp[0] = 0;
fProbintn[0] = 0;
Double_t sig1 = 0.113;
alfa*f2/(TMath::Power(sig2,3.)))*0.005;
fProbintp[i] = fProbintp[i-1] + probp;
fProbintn[i] = fProbintp[i];
-// printf(" fProbintp[%d] = %f, fProbintp[%d] = %f\n",i,fProbintp[i],i,fProbintn[i]);
+ }
+ if(fDebugOpt == 1){
+ printf("\n\n Initialization of Fermi momenta distribution \n");
+ for(Int_t i=0; i<=200; i++){
+ printf(" fProbintp[%d] = %f, fProbintn[%d] = %f\n",i,fProbintp[i],i,fProbintn[i]);
+ }
}
}
//_____________________________________________________________________________
-void AliGenZDC::ExtractFermi(Int_t id, Double_t* fPp, Double_t* fProbintp,
- Double_t* fProbintn, Double_t* ddp)
+void AliGenZDC::ExtractFermi(Int_t id, Double_t *fPp, Double_t *fProbintp,
+ Double_t *fProbintn, Double_t *ddp)
{
//
// Compute Fermi momentum for spectator nucleons
//
-// printf(" Extraction of Fermi momentum\n");
-
+
Int_t i;
Float_t xx = gRandom->Rndm();
assert ( id==kProton || id==kNeutron );
ddp[0] = pext*TMath::Sin(tet)*TMath::Cos(phi);
ddp[1] = pext*TMath::Sin(tet)*TMath::Sin(phi);
ddp[2] = pext*cost;
-// printf(" pFx = %f pFy = %f pFz = %f \n",ddp[0],ddp[1],ddp[2]);
+
+ if(fDebugOpt == 1){
+ printf("\n\n Extraction of Fermi momentum\n");
+ printf("\n pxFermi = %f pyFermi = %f pzFermi = %f \n",ddp[0],ddp[1],ddp[2]);
+ }
}
//_____________________________________________________________________________
void AliGenZDC::BeamDivCross(Int_t icross, Float_t fBeamDiv, Float_t fBeamCrossAngle,
- Int_t fBeamCrossPlane, Double_t* pLab)
+ Int_t fBeamCrossPlane, Double_t *pLab)
{
Double_t tetpart, fipart, tetdiv=0, fidiv=0, angleSum[2], tetsum, fisum;
Double_t rvec;
-// printf(" Beam divergence and crossing angle\n");
Int_t i;
Double_t pmq = 0.;
for(i=0; i<=2; i++){
pLab[0] = pmod*TMath::Sin(tetsum)*TMath::Cos(fisum);
pLab[1] = pmod*TMath::Sin(tetsum)*TMath::Sin(fisum);
pLab[2] = pmod*TMath::Cos(tetsum);
- for(i=0; i<=2; i++){
- fDivP[i] = pLab[i];
+ if(fDebugOpt == 1){
+ printf("\n\n Beam divergence and crossing angle\n");
+ for(i=0; i<=2; i++){
+ printf(" pLab[%d] = %f\n",i,pLab[i]);
+ }
}
}
//_____________________________________________________________________________
void AliGenZDC::AddAngle(Double_t theta1, Double_t phi1, Double_t theta2,
- Double_t phi2, Double_t* angleSum)
+ Double_t phi2, Double_t *angleSum)
{
Double_t temp, conv, cx, cy, cz, ct1, st1, ct2, st2, cp1, sp1, cp2, sp2;
Double_t rtetsum, tetsum, fisum;
git://git.uio.no / u / mrichter / AliRoot.git / blobdiff