/*
$Log$
+Revision 1.19 2003/01/14 10:50:18 alibrary
+Cleanup of STEER coding conventions
+
+Revision 1.18 2002/12/11 11:58:11 morsch
+Bug in formula for pi0 energy for decay corrected.
+
+Revision 1.17 2002/12/10 17:44:57 morsch
+Correct mother child relation for pi0.
+
+Revision 1.16 2002/11/28 11:46:15 morsch
+Don't track pi0 if already decayed.
+
+Revision 1.15 2002/11/28 11:38:53 morsch
+Typo corrected.
+
+Revision 1.14 2002/11/26 17:12:36 morsch
+Decay pi0 if requested.
+
+Revision 1.13 2002/10/14 14:55:35 hristov
+Merging the VirtualMC branch to the main development branch (HEAD)
+
+Revision 1.11.4.1 2002/07/24 08:56:28 alibrary
+Updating EVGEN on TVirtulaMC
+
+Revision 1.12 2002/06/19 06:56:34 hristov
+Memory leak corrected
+
+Revision 1.11 2002/03/20 10:21:13 hristov
+Set fPtMax to 15 GeV in order to avoid some numerical problems
+
Revision 1.10 2001/10/15 16:44:46 morsch
- Possibility for vertex distribution truncation.
- Write mc header with vertex position.
// //
///////////////////////////////////////////////////////////////////
-#include "AliGenHIJINGpara.h"
+#include <TArrayF.h>
+#include <TClonesArray.h>
+#include <TDatabasePDG.h>
+#include <TF1.h>
+#include <TParticle.h>
+#include <TPDGCode.h>
+
+#include "AliConst.h"
+#include "AliDecayer.h"
+#include "AliDecayerPythia.h"
#include "AliGenEventHeader.h"
+#include "AliGenHIJINGpara.h"
#include "AliRun.h"
-#include "AliConst.h"
-#include "AliPDG.h"
-
-#include <TF1.h>
-#include <TArrayF.h>
ClassImp(AliGenHIJINGpara)
//
// Default constructor
//
- fPtpi = 0;
- fPtka = 0;
- fETApic = 0;
- fETAkac = 0;
+ fPtpi = 0;
+ fPtka = 0;
+ fETApic = 0;
+ fETAkac = 0;
+ fDecayer = 0;
+ fNt = -1;
SetCutVertexZ();
SetPtRange();
+ SetPi0Decays();
}
//_____________________________________________________________________________
//
// Standard constructor
//
- fName="HIGINGpara";
+ fName="HIJINGpara";
fTitle="HIJING Parametrisation Particle Generator";
- fPtpi = 0;
- fPtka = 0;
- fETApic = 0;
- fETAkac = 0;
+ fPtpi = 0;
+ fPtka = 0;
+ fETApic = 0;
+ fETAkac = 0;
+ fDecayer = 0;
+ fNt = -1;
SetCutVertexZ();
SetPtRange();
+ SetPi0Decays();
}
//_____________________________________________________________________________
fETApic = new TF1("etapic",&etapic,etaMin,etaMax,0);
fETAkac = new TF1("etakac",&etakac,etaMin,etaMax,0);
- TF1 *etaPic0 = new TF1("etapic",&etapic,-7,7,0);
- TF1 *etaKac0 = new TF1("etakac",&etakac,-7,7,0);
+ TF1 etaPic0("etapic",&etapic,-7,7,0);
+ TF1 etaKac0("etakac",&etakac,-7,7,0);
- TF1 *ptPic0 = new TF1("ptpi",&ptpi,0.,15.,0);
- TF1 *ptKac0 = new TF1("ptka",&ptka,0.,15.,0);
+ TF1 ptPic0("ptpi",&ptpi,0.,15.,0);
+ TF1 ptKac0("ptka",&ptka,0.,15.,0);
- Float_t intETApi = etaPic0->Integral(-0.5, 0.5);
- Float_t intETAka = etaKac0->Integral(-0.5, 0.5);
+ Float_t intETApi = etaPic0.Integral(-0.5, 0.5);
+ Float_t intETAka = etaKac0.Integral(-0.5, 0.5);
Float_t scalePi = 7316/(intETApi/1.5);
Float_t scaleKa = 684/(intETAka/2.0);
// Fraction of events corresponding to the selected pt-range
- Float_t intPt = (0.877*ptPic0->Integral(0, 15)+
- 0.123*ptKac0->Integral(0, 15));
- Float_t intPtSel = (0.877*ptPic0->Integral(fPtMin, fPtMax)+
- 0.123*ptKac0->Integral(fPtMin, fPtMax));
+ Float_t intPt = (0.877*ptPic0.Integral(0, 15)+
+ 0.123*ptKac0.Integral(0, 15));
+ Float_t intPtSel = (0.877*ptPic0.Integral(fPtMin, fPtMax)+
+ 0.123*ptKac0.Integral(fPtMin, fPtMax));
Float_t ptFrac = intPtSel/intPt;
// Fraction of events corresponding to the selected eta-range
- Float_t intETASel = (scalePi*etaPic0->Integral(etaMin, etaMax)+
- scaleKa*etaKac0->Integral(etaMin, etaMax));
+ Float_t intETASel = (scalePi*etaPic0.Integral(etaMin, etaMax)+
+ scaleKa*etaKac0.Integral(etaMin, etaMax));
// Fraction of events corresponding to the selected phi-range
Float_t phiFrac = (fPhiMax-fPhiMin)/2/TMath::Pi();
printf("\n THE ALLOWED PSEUDORAPIDITY RANGE (-8. - 8.)");
printf("\n YOUR LIMITS: %f %f \n \n ", etaMin, etaMax);
}
+//
+//
+ if (fPi0Decays) fDecayer = new AliDecayerPythia();
}
+
//_____________________________________________________________________________
void AliGenHIJINGpara::Generate()
{
Float_t pt, pl, ptot;
Float_t phi, theta;
Float_t p[3];
- Int_t i, part, nt, j;
+ Int_t i, part, j;
//
TF1 *ptf;
TF1 *etaf;
if(random[0]<kBorne) {
part=kPions[Int_t (random[1]*3)];
ptf=fPtpi;
- etaf=fETApic;
+ etaf=fETApic;
} else {
part=kKaons[Int_t (random[1]*4)];
ptf=fPtka;
TMath::Sqrt(-2*TMath::Log(random[2*j+1]));
}
}
- SetTrack(fTrackIt,-1,part,p,origin,polar,0,kPPrimary,nt,fParentWeight);
+ if (part == kPi0 && fPi0Decays){
+//
+// Decay pi0 if requested
+ SetTrack(0,-1,part,p,origin,polar,0,kPPrimary,fNt,fParentWeight);
+ KeepTrack(fNt);
+ DecayPi0(origin, p);
+ } else {
+ SetTrack(fTrackIt,-1,part,p,origin,polar,0,kPPrimary,fNt,fParentWeight);
+ KeepTrack(fNt);
+ }
+
break;
}
+ SetHighWaterMark(fNt);
}
+//
+
// Header
AliGenEventHeader* header = new AliGenEventHeader("HIJINGparam");
// Event Vertex
}
void AliGenHIJINGpara::SetPtRange(Float_t ptmin, Float_t ptmax) {
- AliGenerator::SetPtRange(ptmin, ptmax);
+ AliGenerator::SetPtRange(ptmin, ptmax);
}
+void AliGenHIJINGpara::DecayPi0(Float_t* orig, Float_t * p)
+{
+//
+// Decay the pi0
+// and put decay products on the stack
+//
+ static TClonesArray *particles;
+ if(!particles) particles = new TClonesArray("TParticle",1000);
+//
+ const Float_t kMass = TDatabasePDG::Instance()->GetParticle(kPi0)->Mass();
+ Float_t e = TMath::Sqrt(p[0] * p[0] + p[1] * p[1] + p[2] * p[2]+ kMass * kMass);
+//
+// Decay the pi0
+ TLorentzVector pmom(p[0], p[1], p[2], e);
+ fDecayer->Decay(kPi0, &pmom);
+
+//
+// Put decay particles on the stack
+//
+ Float_t polar[3] = {0., 0., 0.};
+ Int_t np = fDecayer->ImportParticles(particles);
+ Int_t nt;
+ for (Int_t i = 1; i < np; i++)
+ {
+ TParticle* iParticle = (TParticle *) particles->At(i);
+ p[0] = iParticle->Px();
+ p[1] = iParticle->Py();
+ p[2] = iParticle->Pz();
+ Int_t part = iParticle->GetPdgCode();
+
+ SetTrack(fTrackIt, fNt, part, p, orig, polar, 0, kPDecay, nt, fParentWeight);
+ KeepTrack(nt);
+ }
+ fNt = nt;
+}