* provided "as is" without express or implied warranty. *
**************************************************************************/
-/*
-$Log$
-Revision 1.4 2000/10/05 08:02:47 fca
-Correction of the generator direction
+/* $Id$ */
-Revision 1.3 2000/10/02 21:28:20 fca
-Removal of useless dependecies via forward declarations
+//////////////////////////////////////////////////////////////////////
+// // //
+// Generator of spectator nucleons (either protons or neutrons)//
+// computes beam crossing and divergence and Fermi momentum //
+// //
+/////////////////////////////////////////////////////////////////////
-Revision 1.2 2000/07/11 11:12:34 fca
-Some syntax corrections for non standard HP aCC
-
-Revision 1.1 2000/07/10 13:58:01 fca
-New version of ZDC from E.Scomparin & C.Oppedisano
-
-Revision 1.7 2000/01/19 17:17:40 fca
-
-Revision 1.6 1999/09/29 09:24:35 fca
-Introduction of the Copyright and cvs Log
-
-*/
#include <assert.h>
-#include <TRandom.h>
+#include <TDatabasePDG.h>
#include <TLorentzVector.h>
+#include <TMCProcess.h>
+#include <TPDGCode.h>
+#include <TRandom.h>
#include <TVector3.h>
-#include "TDatabasePDG.h"
-#include "AliGenZDC.h"
#include "AliConst.h"
-#include "AliPDG.h"
+#include "AliGenZDC.h"
#include "AliRun.h"
+#include "AliMC.h"
ClassImp(AliGenZDC)
//_____________________________________________________________________________
AliGenZDC::AliGenZDC()
- :AliGenerator()
+ :AliGenerator(),
+ fIpart(0),
+ fCosx(0),
+ fCosy(0),
+ fCosz(0),
+ fPseudoRapidity(0),
+ fFermiflag(0),
+ fBeamDiv(0),
+ fBeamCrossAngle(0),
+ fBeamCrossPlane(0),
+ fDebugOpt(0)
{
//
// Default constructor
//
- fIpart = 0;
+ for(Int_t i=0; i<201; i++){
+ fProbintp[i]=0.;
+ fProbintn[i]=0.;
+ fPp[i]=0.;
+ }
}
//_____________________________________________________________________________
AliGenZDC::AliGenZDC(Int_t npart)
- :AliGenerator(npart)
+ :AliGenerator(npart),
+ fIpart(kNeutron),
+ fCosx(0.),
+ fCosy(0.),
+ fCosz(1.),
+ fPseudoRapidity(0.),
+ fFermiflag(1),
+ fBeamDiv(0.000032),
+ fBeamCrossAngle(0.0001),
+ fBeamCrossPlane(2),
+ fDebugOpt(0)
{
//
// Standard constructor
//
fName = "AliGenZDC";
fTitle = "Generation of Test Particles for ZDCs";
- fIpart = kNeutron;
- fCosx = 0.;
- fCosy = 0.;
- fCosz = 1.;
- fPseudoRapidity = 0.;
- fFermiflag = 1;
- // LHC values for beam divergence and crossing angle
- fBeamDiv = 0.000032;
- fBeamCrossAngle = 0.0001;
- fBeamCrossPlane = 2;
+
+ for(Int_t i=0; i<201; i++){
+ fProbintp[i] = 0;
+ fProbintn[i] = 0;
+ fPp[i] = 0;
+ }
}
//_____________________________________________________________________________
void AliGenZDC::Init()
{
- printf(" 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);
+ //
+ printf("\n\n AliGenZDC initialization:\n");
+ printf(" Particle: %d, Track cosines: x = %f, y = %f, z = %f \n",
+ fIpart,fCosx,fCosy,fCosz);
+ printf(" Fermi flag = %d, Beam divergence = %f, Crossing angle "
+ "= %f, Crossing plane = %d\n\n", fFermiflag, fBeamDiv, fBeamCrossAngle,
+ fBeamCrossPlane);
+
+ FermiTwoGaussian(208.);
}
//_____________________________________________________________________________
//
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]={0.,0.,0.}, dddp0, dddp[3];
+ Float_t fPTrack[3], ptot = fPMin;
Int_t nt;
if(fPseudoRapidity==0.){
pLab[1] = 0.;
pLab[2] = ptot*TMath::Cos(scang);
}
- for(i=0; i<=2; i++){
- fPInit[i] = pLab[i];
- fP[i] = pLab[i];
+ for(i=0; i<=2; i++) fP[i] = pLab[i];
+ if(fDebugOpt == 1){
+ printf("\n\n Particle momentum before divergence and crossing\n");
+ for(i=0; i<=2; i++)printf(" pLab[%d] = %f\n",i,pLab[i]);
}
// Beam divergence and crossing angle
if(fBeamCrossAngle!=0.) {
- BeamDivCross(1,fBeamDiv,fBeamCrossAngle,fBeamCrossPlane,pLab);
- for(i=0; i<=2; i++){
- fP[i] = pLab[i];
- }
+ BeamDivCross(1, pLab);
+ for(i=0; i<=2; i++) fP[i] = pLab[i];
}
if(fBeamDiv!=0.) {
- BeamDivCross(0,fBeamDiv,fBeamCrossAngle,fBeamCrossPlane,pLab);
- for(i=0; i<=2; i++){
- fP[i] = pLab[i];
- }
+ BeamDivCross(0, pLab);
+ for(i=0; i<=2; i++) fP[i] = pLab[i];
}
// If required apply the Fermi momentum
if(fFermiflag==1){
- if((fIpart==kProton) || (fIpart==kNeutron)){
- ExtractFermi(fIpart,fPp,fProbintp,fProbintn,ddp);
- }
- mass=gAlice->PDGDB()->GetParticle(fIpart)->Mass();
+ if((fIpart==kProton) || (fIpart==kNeutron))
+ ExtractFermi(fIpart, ddp);
+ mass=TDatabasePDG::Instance()->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];
- }
+ 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);
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];
}
- for(i=0; i<=2; i++){
- fPTrack[i] = fP[i];
- }
+ for(i=0; i<=2; i++) fPTrack[i] = fP[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);
+ gAlice->GetMCApp()->PushTrack(fTrackIt,-1,fIpart,fPTrack,fOrigin.GetArray(),polar,0,
+ kPPrimary,nt);
+ // -----------------------------------------------------------------------
+ if(fDebugOpt == 1){
+ printf("\n\n Track momentum:\n");
+ printf("\n fPTrack = %f, %f, %f \n",fPTrack[0],fPTrack[1],fPTrack[2]);
+ }
+ else if(fDebugOpt == 2){
+ FILE *file;
+ if((file = fopen("SpectMomentum.dat","a")) == NULL){
+ printf("Cannot open file SpectMomentum.dat\n");
+ return;
+ }
+ fprintf(file," %f \t %f \t %f \n",fPTrack[0],fPTrack[1],fPTrack[2]);
+ fclose(file);
+ }
+
}
//_____________________________________________________________________________
-void AliGenZDC::FermiTwoGaussian(Double_t A, Float_t Z, Double_t* fPp, Double_t*
- fProbintp, Double_t* fProbintn)
+void AliGenZDC::FermiTwoGaussian(Float_t A)
{
//
// 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;
Double_t sig2 = 0.250;
Double_t alfa = 0.18*(TMath::Power((A/12.),(Float_t)1/3));
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 *ddp)
{
//
// Compute Fermi momentum for spectator nucleons
//
-// printf(" Extraction of Fermi momentum\n");
-
- Int_t i;
+
+ Int_t index=0;
Float_t xx = gRandom->Rndm();
assert ( id==kProton || id==kNeutron );
if(id==kProton){
- for(i=0; i<=200; i++){
+ for(Int_t i=1; i<=200; i++){
if((xx>=fProbintp[i-1]) && (xx<fProbintp[i])) break;
- }
+ index = i;
+ }
}
else {
- for(i=0; i<=200; i++){
+ for(Int_t i=1; i<=200; i++){
if((xx>=fProbintn[i-1]) && (xx<fProbintn[i])) break;
- }
- }
- Float_t pext = fPp[i]+0.001;
- Float_t phi = k2PI*(gRandom->Rndm());
- Float_t cost = (1.-2.*(gRandom->Rndm()));
- Float_t tet = TMath::ACos(cost);
- 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]);
+ index = i;
+ }
+ }
+ Float_t pext = fPp[index]+0.001;
+ Float_t phi = k2PI*(gRandom->Rndm());
+ Float_t cost = (1.-2.*(gRandom->Rndm()));
+ Float_t tet = TMath::ACos(cost);
+ ddp[0] = pext*TMath::Sin(tet)*TMath::Cos(phi);
+ ddp[1] = pext*TMath::Sin(tet)*TMath::Sin(phi);
+ ddp[2] = pext*cost;
+
+ 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)
+void AliGenZDC::BeamDivCross(Int_t icross, Double_t *pLab)
{
+ // Applying beam divergence and crossing angle
+ //
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++){
- pmq = pmq+pLab[i]*pLab[i];
- }
+ Int_t i;
+ for(i=0; i<=2; i++) pmq = pmq+pLab[i]*pLab[i];
Double_t pmod = TMath::Sqrt(pmq);
- if(icross==0){
+ if(icross==0){ // ##### Beam divergence
rvec = gRandom->Gaus(0.0,1.0);
tetdiv = fBeamDiv * TMath::Abs(rvec);
fidiv = (gRandom->Rndm())*k2PI;
}
- else if(icross==1){
- if(fBeamCrossPlane==0.){
+ else if(icross==1){ // ##### Crossing angle
+ if(fBeamCrossPlane==0){
tetdiv = 0.;
fidiv = 0.;
}
- else if(fBeamCrossPlane==1.){
+ else if(fBeamCrossPlane==1){ // Horizontal crossing plane
tetdiv = fBeamCrossAngle;
fidiv = 0.;
}
- else if(fBeamCrossPlane==2.){
+ else if(fBeamCrossPlane==2){ // Vertical crossing plane
tetdiv = fBeamCrossAngle;
fidiv = k2PI/4.;
}
}
- tetpart = TMath::ATan(TMath::Sqrt(pLab[0]*pLab[0]+pLab[1]*pLab[1])/pLab[2]);
- if(pLab[1]!=0. || pLab[0]!=0.){
- fipart = TMath::ATan2(pLab[1],pLab[0]);
- }
- else{
- fipart = 0.;
- }
+ tetpart = TMath::ATan2(TMath::Sqrt(pLab[0]*pLab[0]+pLab[1]*pLab[1]),pLab[2]);
+ if(pLab[1]!=0. || pLab[0]!=0.) fipart = TMath::ATan2(pLab[1],pLab[0]);
+ else fipart = 0.;
if(fipart<0.) {fipart = fipart+k2PI;}
tetdiv = tetdiv*kRaddeg;
fidiv = fidiv*kRaddeg;
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){
+ if(icross==0) printf("\n\n Beam divergence \n");
+ else printf("\n\n Beam crossing \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)
+{
+ // Calculating the sum of 2 angles
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