Adding PiKP-only resolution histograms and switch to turn off many histograms which...

[u/mrichter/AliRoot.git] / EVGEN / AliGenMC.cxx

diff --git a/EVGEN/AliGenMC.cxx b/EVGEN/AliGenMC.cxx
index 61166d587fc9384b0eeeaa3a78f464213487a6b7..95a629121201a737c5dbc6a91d5049485dda939a 100644 (file)
--- a/EVGEN/AliGenMC.cxx
+++ b/EVGEN/AliGenMC.cxx
@@ -25,10 +25,13 @@
 #include <TMath.h>
 #include <TPDGCode.h>
 #include <TParticle.h>
+#include <TLorentzVector.h>
+#include <TVector3.h>
 
 #include "AliGenMC.h"
 #include "AliRun.h"
 #include "AliGeometry.h"
+#include "AliDecayer.h"
 
 ClassImp(AliGenMC)
 
@@ -52,20 +55,19 @@ AliGenMC::AliGenMC()
      fXingAngleY(0.),
      fForceDecay(kAll),
      fMaxLifeTime(1.e-15),
-     fAProjectile(1),
-     fZProjectile(1),
-     fATarget(1),
-     fZTarget(1),
-     fProjectile("P"),
-     fTarget("P"),    
      fDyBoost(0.),
      fGeometryAcceptance(0),
      fPdgCodeParticleforAcceptanceCut(0),
      fNumberOfAcceptedParticles(0),
-     fNprimaries(0),
-     fEnergyCMS(0)
+     fNprimaries(0)
 {
 // Default Constructor
+  fAProjectile = 1;
+  fZProjectile = 1;
+  fATarget = 1;
+  fZTarget = 1;
+  fProjectile = "P";
+  fTarget = "P";
 }
 
 AliGenMC::AliGenMC(Int_t npart)
@@ -88,22 +90,21 @@ AliGenMC::AliGenMC(Int_t npart)
      fXingAngleY(0.),
      fForceDecay(kAll),
      fMaxLifeTime(1.e-15),
-     fAProjectile(1),
-     fZProjectile(1),
-     fATarget(1),
-     fZTarget(1),
-     fProjectile("P"),
-     fTarget("P"),    
      fDyBoost(0.),
      fGeometryAcceptance(0),
      fPdgCodeParticleforAcceptanceCut(0),
      fNumberOfAcceptedParticles(0),
-     fNprimaries(0),
-     fEnergyCMS(0)
+     fNprimaries(0)
 {
 //  Constructor
 // 
-    for (Int_t i=0; i<8; i++) fParentSelect[i]=fChildSelect[i]=0;
+  fAProjectile = 1;
+  fZProjectile = 1;
+  fATarget = 1;
+  fZTarget = 1;
+  fProjectile = "P";
+  fTarget = "P";
+  for (Int_t i=0; i<8; i++) fParentSelect[i]=fChildSelect[i]=0;
 }
 
 AliGenMC::~AliGenMC()
@@ -121,12 +122,15 @@ void AliGenMC::Init()
     case kDiElectron:
     case kBJpsiDiElectron:
     case kBPsiPrimeDiElectron:
+    case kElectronEM:
+    case kDiElectronEM:
        fChildSelect[0] = kElectron;    
        break;
     case kHardMuons:   
     case kBSemiMuonic:
     case kSemiMuonic:
     case kDiMuon:
+    case kJpsiDiMuon:
     case kBJpsiDiMuon:
     case kBPsiPrimeDiMuon:
     case kPiToMu:
@@ -158,12 +162,23 @@ void AliGenMC::Init()
         fChildSelect[0]= 22;
         fChildSelect[1]= 11;
         break;
-
-    case kOmega:       
+    case kLambda:      
+       fChildSelect[0]= kProton;
+        fChildSelect[1]= 211;
+       break;
+    case kPsiPrimeJpsiDiElectron:
+        fChildSelect[0]= 211;
+        fChildSelect[1]= 11;
+       break;
+    case kGammaEM:
+        fChildSelect[0] = kGamma;      
+        break;
+    case kOmega:
     case kAll:
     case kAllMuonic:
     case kNoDecay:
     case kNoDecayHeavy:
+    case kNoDecayBeauty:
     case kNeutralPion:
        break;
     }
@@ -196,17 +211,21 @@ Bool_t AliGenMC::ChildSelected(Int_t ip) const
     return kFALSE;
 }
 
-Bool_t AliGenMC::KinematicSelection(TParticle *particle, Int_t flag) const
+Bool_t AliGenMC::KinematicSelection(const TParticle *particle, Int_t flag) const
 {
 // Perform kinematic selection
     Double_t pz    = particle->Pz();
-    Double_t  e    = particle->Energy();
     Double_t pt    = particle->Pt();
     Double_t p     = particle->P();
     Double_t theta = particle->Theta();
     Double_t mass  = particle->GetCalcMass();
     Double_t mt2   = pt * pt + mass * mass;
     Double_t phi   = particle->Phi();
+    Double_t e     = particle->Energy();
+    
+    if (e == 0.)     
+       e = TMath::Sqrt(p * p + mass * mass);
+
     
     Double_t y, y0;
 
@@ -363,7 +382,7 @@ void AliGenMC::Boost()
 //
 
     Double_t beta  = TMath::TanH(fDyBoost);
-    Double_t gamma = 1./TMath::Sqrt(1.-beta*beta);
+    Double_t gamma = 1./TMath::Sqrt((1.-beta)*(1.+beta));
     Double_t gb    = gamma * beta;
 
     //    printf("\n Boosting particles to lab frame %f %f %f", fDyBoost, beta, gamma);
@@ -386,6 +405,46 @@ void AliGenMC::Boost()
     }
 }
 
+void AliGenMC::BeamCrossAngle()
+{
+  // Applies a boost in the y-direction in order to take into account the 
+  // beam crossing angle
+
+  Double_t thetaPr0, phiPr0, pyPr2, pzPr2;
+  TVector3 beta;
+  
+  thetaPr0 = fXingAngleY / 2.;
+  phiPr0 = 0;
+
+  // Momentum of the CMS system
+  pyPr2 = TMath::Sqrt(fEnergyCMS * fEnergyCMS/ 4 - 0.938 * 0.938) * TMath::Sin(thetaPr0); 
+  pzPr2 = TMath::Sqrt(fEnergyCMS * fEnergyCMS/ 4 - 0.938 * 0.938) * TMath::Cos(thetaPr0);
+
+  TLorentzVector proj1Vect, proj2Vect, projVect;
+  proj1Vect.SetPxPyPzE(0., pyPr2, pzPr2, fEnergyCMS/2);
+  proj2Vect.SetPxPyPzE(0., pyPr2,-pzPr2, fEnergyCMS/2);
+  projVect = proj1Vect + proj2Vect;
+  beta=(1. / projVect.E()) * (projVect.Vect());
+
+  Int_t i;
+  Int_t np = fParticles.GetEntriesFast();
+  for (i = 0; i < np; i++) 
+    {
+      TParticle* iparticle = (TParticle*) fParticles.At(i);
+
+      Double_t e   = iparticle->Energy();
+      Double_t px  = iparticle->Px();
+      Double_t py  = iparticle->Py();
+      Double_t pz  = iparticle->Pz();
+      
+      TLorentzVector partIn;
+      partIn.SetPxPyPzE(px,py,pz,e);
+      partIn.Boost(beta);
+      iparticle->SetMomentum(partIn.Px(),partIn.Py(),partIn.Pz(),partIn.E());
+    }
+}
+
+
 void AliGenMC::AddHeader(AliGenEventHeader* header)
 {
     // Passes header either to the container or to gAlice