PWGLF/totEt/AliAnalysisEtSelector.cxx

   1 //_________________________________________________________________________
   2 //  Utility Class for transverse energy studies
   3 //  Selector Base class
   4 //  -
   5 // implementation file
   6 //
   7 //*-- Authors: Oystein Djuvsland (Bergen)
   8 //_________________________________________________________________________
   9 #include "AliAnalysisEtSelector.h"
  10 #include "AliAnalysisEtCuts.h"
  11 #include "AliESDCaloCluster.h"
  12 #include "AliStack.h"
  13 #include "TParticle.h"
  14 #include "TParticlePDG.h"
  15 #include "AliAnalysisEtCommon.h"
  16 #include <iostream>
  17
  18 ClassImp(AliAnalysisEtSelector);
  19
  20 AliAnalysisEtSelector::AliAnalysisEtSelector(AliAnalysisEtCuts *cuts) : AliAnalysisEtCommon()
  21 ,fEvent(0)
  22 ,fClusterArray(0)
  23 ,fCuts(cuts)
  24 ,fRunNumber(0)
  25 ,fInitialized(kFALSE)
  26 {
  27 }
  28 AliAnalysisEtSelector::AliAnalysisEtSelector() : AliAnalysisEtCommon()
  29 ,fEvent(0)
  30 ,fClusterArray(0)
  31 ,fCuts(0)
  32 ,fRunNumber(0)
  33 ,fInitialized(kFALSE)
  34 {
  35   fCuts = new AliAnalysisEtCuts();
  36 }
  37
  38 AliAnalysisEtSelector::~AliAnalysisEtSelector()
  39 { // dtor
  40   if(fClusterArray)
  41   {
  42     delete fClusterArray;
  43   }
  44 }
  45 void AliAnalysisEtSelector::SetEvent(const AliESDEvent* event)
  46 {
  47     fEvent = event;
  48     if(!fInitialized) Init(event);
  49 }
  50
  51 Bool_t AliAnalysisEtSelector::IsNeutralMcParticle(Int_t pIdx, AliStack& s, const TParticlePDG& pdg) const
  52 {
  53   return s.IsPhysicalPrimary(pIdx) &&(TMath::Abs(TMath::Abs(pdg.Charge()) - fCuts->GetMonteCarloNeutralParticle())<1e-3);
  54 }
  55
  56 Bool_t AliAnalysisEtSelector::IsEmEtParticle(const Int_t pdgCode) const
  57 {
  58   return pdgCode == fgGammaCode || pdgCode == fgPi0Code || pdgCode == fgEtaCode || pdgCode == fgEPlusCode || pdgCode == fgEMinusCode;
  59 }
  60
  61
  62 Bool_t AliAnalysisEtSelector::PrimaryIsEmEtParticle(const Int_t pIdx, AliStack& stack) const
  63 {
  64   return IsEmEtParticle(stack.Particle(GetPrimary(pIdx, stack))->GetPdgCode());
  65 }
  66 Int_t AliAnalysisEtSelector::GetPrimary(const Int_t partIdx, AliStack& stack) const
  67 { // get primary
  68   if(partIdx >= 0)
  69   {
  70     Int_t mothIdx = stack.Particle(partIdx)->GetMother(0);
  71     if(mothIdx < 0) return -1;
  72     TParticle *mother = stack.Particle(mothIdx);
  73     if(mother)
  74     {
  75       if(stack.IsPhysicalPrimary(mothIdx)) return mothIdx;
  76       else return GetPrimary(mothIdx, stack);
  77     }
  78     else
  79     {
  80       std::cout << "WAT!" << std::endl;
  81       return -1;
  82     }
  83   }
  84   return -1;
  85 }
  86 Bool_t AliAnalysisEtSelector::FromSecondaryInteraction(const TParticle& part, AliStack &stack) const
  87 {
  88 //   Bool_t partVtxSecondary = (
  89 //                            TMath::Sqrt(part.Vx()*part.Vx() + part.Vy()*part.Vy()) > fCuts->GetPrimaryVertexCutXY()
  90 //                            || TMath::Abs(part.Vz()) > fCuts->GetPrimaryVertexCutZ()
  91 //                          )
  92 //                          && TMath::Sqrt(part.Vx()*part.Vx()+part.Vy()*part.Vy() + part.Vz()*part.Vz())<(fCuts->GetGeometryPhosDetectorRadius()-10);
  93
  94
  95 //   Bool_t partVtxSecondary = (TMath::Sqrt(part.Vx()*part.Vx() + part.Vy()*part.Vy()) <300);
  96 //   //Let's find suspect decay (typical for secondary interaction)...
  97 //   if(partVtxSecondary){
  98     return SuspiciousDecayInChain(211, 111, part, stack);
  99 //   }
 100 //   else{
 101 //     return kFALSE;
 102 //   }
 103
 104
 105
 106
 107 }
 108
 109 Bool_t AliAnalysisEtSelector::SuspiciousDecayInChain(const UInt_t suspectMotherPdg, const UInt_t suspectDaughterPdg, const TParticle &part, AliStack& stack) const
 110 {
 111   UInt_t partPdg = TMath::Abs(part.GetPdgCode());
 112   if(part.GetFirstMother() == -1)
 113   {
 114     return kFALSE;
 115   }
 116   TParticle *mother = stack.Particle(part.GetFirstMother());
 117   UInt_t motherPdg = TMath::Abs(mother->GetPdgCode());
 118   if((suspectDaughterPdg==partPdg || 2112 == partPdg )&& suspectMotherPdg == motherPdg)
 119   {
 120     return kTRUE;
 121   }
 122   return SuspiciousDecayInChain(suspectMotherPdg, suspectDaughterPdg, *mother, stack);
 123 }
 124
 125 Float_t AliAnalysisEtSelector::ShiftAngle(Float_t phi){//Always returns an angle in radians between -pi<phi<pi
 126   float myphi = phi;
 127   while(myphi>TMath::Pi()){//angle is too high, decrease the angle
 128     myphi = myphi - 2*TMath::Pi();
 129   }
 130   while(myphi<-TMath::Pi()){//angle is too low, increase the angle
 131     myphi = myphi + 2*TMath::Pi();
 132   }
 133   return myphi;
 134 }