Added a new class for the AOD information
[u/mrichter/AliRoot.git] / PWG4 / GammaConv / AliAnalysisTaskGammaConversion.cxx
index 38029455f08e20d28c2022242288008e11392f52..38da271331080bacbf26f1e3501ec18febabb0a2 100644 (file)
-/**************************************************************************\r
- * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *\r
- *                                                                        *\r
- * Author: Ana Marin, Kathrin Koch, Kenneth Aamodt                        *\r
- * Version 1.1                                                            *\r
- *                                                                        *\r
- * Permission to use, copy, modify and distribute this software and its   *\r
- * documentation strictly for non-commercial purposes is hereby granted   *\r
- * without fee, provided that the above copyright notice appears in all   *\r
- * copies and that both the copyright notice and this permission notice   *\r
- * appear in the supporting documentation. The authors make no claims     *\r
- * about the suitability of this software for any purpose. It is          *\r
- * provided "as is" without express or implied warranty.                  *\r
- **************************************************************************/\r
-\r
-////////////////////////////////////////////////\r
-//--------------------------------------------- \r
-// Class used to do analysis on conversion pairs\r
-//---------------------------------------------\r
-////////////////////////////////////////////////\r
-\r
-// root\r
-#include <TChain.h>\r
-\r
-// analysis\r
-#include "AliAnalysisTaskGammaConversion.h"\r
-#include "AliStack.h"\r
-#include "AliLog.h"\r
-#include "TNtuple.h"\r
-\r
-class AliKFVertex;\r
-class AliAODHandler;\r
-class AliAODEvent;\r
-class ALiESDEvent;\r
-class AliMCEvent;\r
-class AliMCEventHandler;\r
-class AliESDInputHandler;\r
-class AliAnalysisManager;\r
-class Riostream;\r
-class TFile;\r
-class TInterpreter;\r
-class TSystem;\r
-class TROOT;\r
-\r
-ClassImp(AliAnalysisTaskGammaConversion)\r
-\r
-\r
-AliAnalysisTaskGammaConversion::AliAnalysisTaskGammaConversion():\r
-AliAnalysisTaskSE(),\r
-  fV0Reader(NULL),\r
-  fStack(NULL),\r
-  fESDEvent(NULL),     \r
-  fOutputContainer(NULL),\r
-  fHistograms(NULL),\r
-  fDoMCTruth(kFALSE),\r
-  fMCAllGammas(),\r
-  fMCPi0s(),\r
-  fMCEtas(),\r
-  fMCGammaChic(),\r
-  fKFReconstructedGammas(),\r
-  fIsTrueReconstructedGammas(),\r
-  fElectronv1(),\r
-  fElectronv2(),\r
-  fCurrentEventPosElectron(),\r
-  fPreviousEventPosElectron(),\r
-  fCurrentEventNegElectron(),\r
-  fPreviousEventNegElectron(),\r
-  fKFReconstructedGammasCut(),                 \r
-  fPreviousEventTLVNegElectron(),\r
-  fPreviousEventTLVPosElectron(),      \r
-  fElectronMass(-1),\r
-  fGammaMass(-1),\r
-  fPi0Mass(-1),\r
-  fEtaMass(-1),\r
-  fGammaWidth(-1),\r
-  fPi0Width(-1),\r
-  fEtaWidth(-1),\r
-  fMinOpeningAngleGhostCut(0.),\r
-  fCalculateBackground(kFALSE),\r
-  fWriteNtuple(kFALSE),\r
-  fGammaNtuple(NULL),\r
-  fNeutralMesonNtuple(NULL),\r
-  fTotalNumberOfAddedNtupleEntries(0)\r
-{\r
-  // Default constructor\r
-  // Common I/O in slot 0\r
-  DefineInput (0, TChain::Class());\r
-  DefineOutput(0, TTree::Class());\r
-       \r
-  // Your private output\r
-  DefineOutput(1, TList::Class());\r
-}\r
-\r
-AliAnalysisTaskGammaConversion::AliAnalysisTaskGammaConversion(const char* name):\r
-  AliAnalysisTaskSE(name),\r
-  fV0Reader(NULL),\r
-  fStack(NULL),\r
-  fESDEvent(NULL),     \r
-  fOutputContainer(0x0),\r
-  fHistograms(NULL),\r
-  fDoMCTruth(kFALSE),\r
-  fMCAllGammas(),\r
-  fMCPi0s(),\r
-  fMCEtas(),\r
-  fMCGammaChic(),\r
-  fKFReconstructedGammas(),\r
-  fIsTrueReconstructedGammas(),\r
-  fElectronv1(),\r
-  fElectronv2(),\r
-  fCurrentEventPosElectron(),\r
-  fPreviousEventPosElectron(),\r
-  fCurrentEventNegElectron(),\r
-  fPreviousEventNegElectron(),\r
-  fKFReconstructedGammasCut(), \r
-  fPreviousEventTLVNegElectron(),\r
-  fPreviousEventTLVPosElectron(),\r
-  fElectronMass(-1),\r
-  fGammaMass(-1),\r
-  fPi0Mass(-1),\r
-  fEtaMass(-1),\r
-  fGammaWidth(-1),\r
-  fPi0Width(-1),\r
-  fEtaWidth(-1),\r
-  fMinOpeningAngleGhostCut(0.),\r
-  fCalculateBackground(kFALSE),\r
-  fWriteNtuple(kFALSE),\r
-  fGammaNtuple(NULL),\r
-  fNeutralMesonNtuple(NULL),\r
-  fTotalNumberOfAddedNtupleEntries(0)\r
-{\r
-  // Common I/O in slot 0\r
-  DefineInput (0, TChain::Class());\r
-  DefineOutput(0, TTree::Class());\r
-       \r
-  // Your private output\r
-  DefineOutput(1, TList::Class());\r
-}\r
-\r
-AliAnalysisTaskGammaConversion::~AliAnalysisTaskGammaConversion() \r
-{\r
-  // Remove all pointers\r
-       \r
-  if(fOutputContainer){\r
-    fOutputContainer->Clear() ; \r
-    delete fOutputContainer ;\r
-  }\r
-  if(fHistograms){\r
-    delete fHistograms;\r
-  }\r
-  if(fV0Reader){\r
-    delete fV0Reader;\r
-  }\r
-}\r
-\r
-\r
-void AliAnalysisTaskGammaConversion::Init()\r
-{\r
-  // Initialization\r
-  AliLog::SetGlobalLogLevel(AliLog::kError);\r
-}\r
-\r
-\r
-void AliAnalysisTaskGammaConversion::Exec(Option_t */*option*/)\r
-{\r
-  // Execute analysis for current event\r
-       \r
-  ConnectInputData("");\r
-       \r
-  //clear vectors\r
-  fMCAllGammas.clear();\r
-  fMCPi0s.clear();\r
-  fMCEtas.clear();\r
-  fMCGammaChic.clear();\r
-       \r
-  fKFReconstructedGammas.clear();\r
-  fIsTrueReconstructedGammas.clear();\r
-  fElectronv1.clear();\r
-  fElectronv2.clear();\r
-  fCurrentEventPosElectron.clear();\r
-  fCurrentEventNegElectron.clear();    \r
-  fKFReconstructedGammasCut.clear(); \r
-       \r
-  //Clear the data in the v0Reader\r
-  fV0Reader->UpdateEventByEventData();\r
-\r
-  \r
-  // Process the MC information\r
-  if(fDoMCTruth){\r
-    ProcessMCData();\r
-  }\r
-  \r
-  //Process the v0 information with no cuts\r
-  ProcessV0sNoCut();\r
-  \r
-  // Process the v0 information\r
-  ProcessV0s();\r
-  \r
-  //calculate background if flag is set\r
-  if(fCalculateBackground){\r
-    CalculateBackground();\r
-  }\r
-  \r
-  // Process reconstructed gammas\r
-  ProcessGammasForNeutralMesonAnalysis();\r
-\r
-  CheckV0Efficiency();\r
-  \r
-  //Process reconstructed gammas electrons for Chi_c Analysis\r
-  ProcessGammaElectronsForChicAnalysis();\r
-\r
-  PostData(1, fOutputContainer);\r
-       \r
-}\r
-\r
-void AliAnalysisTaskGammaConversion::ConnectInputData(Option_t */*option*/){\r
-  // see header file for documentation\r
-       \r
-  if(fV0Reader == NULL){\r
-    // Write warning here cuts and so on are default if this ever happens\r
-  }\r
-  fV0Reader->Initialize();\r
-}\r
-\r
-\r
-\r
-void AliAnalysisTaskGammaConversion::ProcessMCData(){\r
-  // see header file for documentation\r
-       \r
-  fStack = fV0Reader->GetMCStack();\r
-\r
-  if(fV0Reader->CheckForPrimaryVertex() == kFALSE){\r
-    return; // aborts if the primary vertex does not have contributors.\r
-  }\r
-\r
-  for (Int_t iTracks = 0; iTracks < fStack->GetNtrack(); iTracks++) {\r
-    TParticle* particle = (TParticle *)fStack->Particle(iTracks);\r
-               \r
-    if (!particle) {\r
-      //print warning here\r
-      continue;\r
-    }\r
-\r
-    ///////////////////////Begin Chic Analysis/////////////////////////////\r
-\r
-\r
-    if(particle->GetPdgCode() == 443){//Is JPsi\r
-\r
-      if(particle->GetNDaughters()==2){\r
-       if(TMath::Abs(fStack->Particle(particle->GetFirstDaughter())->GetPdgCode()) == 11 &&\r
-          TMath::Abs(fStack->Particle(particle->GetLastDaughter())->GetPdgCode()) == 11){\r
-         TParticle* daug0 = fStack->Particle(particle->GetFirstDaughter());\r
-         TParticle* daug1 = fStack->Particle(particle->GetLastDaughter());\r
-         if(TMath::Abs(daug0->Eta()) < 0.9 && TMath::Abs(daug1->Eta()) < 0.9)\r
-           fHistograms->FillTable("Table_Electrons",3);//e+ e-  from J/Psi inside acceptance\r
-\r
-         if( TMath::Abs(daug0->Eta()) < 0.9){\r
-           if(daug0->GetPdgCode() == -11)\r
-             fHistograms->FillTable("Table_Electrons",1);//e+  from J/Psi inside acceptance\r
-           else\r
-             fHistograms->FillTable("Table_Electrons",2);//e-   from J/Psi inside acceptance\r
-\r
-         }\r
-         if(TMath::Abs(daug1->Eta()) < 0.9){\r
-           if(daug1->GetPdgCode() == -11)\r
-             fHistograms->FillTable("Table_Electrons",1);//e+  from J/Psi inside acceptance\r
-           else\r
-             fHistograms->FillTable("Table_Electrons",2);//e-   from J/Psi inside acceptance\r
-         }\r
-       }\r
-      }\r
-    }\r
-    //              const int CHI_C0   = 10441;\r
-    //              const int CHI_C1   = 20443;\r
-    //              const int CHI_C2   = 445\r
-    if(particle->GetPdgCode() == 22){//gamma from JPsi\r
-      if(particle->GetMother(0) > -1){\r
-       if(fStack->Particle(particle->GetMother(0))->GetPdgCode() == 10441 ||\r
-          fStack->Particle(particle->GetMother(0))->GetPdgCode() == 20443 ||\r
-          fStack->Particle(particle->GetMother(0))->GetPdgCode() == 445){\r
-         if(TMath::Abs(particle->Eta()) < 1.2)\r
-           fHistograms->FillTable("Table_Electrons",17);// gamma from chic inside accptance\r
-       }\r
-      }\r
-    }\r
-    if(particle->GetPdgCode() == 10441 || particle->GetPdgCode() == 20443 || particle->GetPdgCode() == 445){\r
-      if( particle->GetNDaughters() == 2){\r
-       TParticle* daug0 = fStack->Particle(particle->GetFirstDaughter());\r
-       TParticle* daug1 = fStack->Particle(particle->GetLastDaughter());\r
-\r
-       if( (daug0->GetPdgCode() == 443 || daug0->GetPdgCode() == 22) && (daug1->GetPdgCode() == 443 || daug1->GetPdgCode() == 22) ){\r
-         if( daug0->GetPdgCode() == 443){\r
-           TParticle* daugE0 = fStack->Particle(daug0->GetFirstDaughter());\r
-           TParticle* daugE1 = fStack->Particle(daug0->GetLastDaughter());\r
-           if( TMath::Abs(daug1->Eta()) < 1.2 && TMath::Abs(daugE0->Eta()) < 0.9 && TMath::Abs(daugE1->Eta()) < 0.9 )\r
-             fHistograms->FillTable("Table_Electrons",18);\r
-\r
-         }//if\r
-         else if (daug1->GetPdgCode() == 443){\r
-           TParticle* daugE0 = fStack->Particle(daug1->GetFirstDaughter());\r
-           TParticle* daugE1 = fStack->Particle(daug1->GetLastDaughter());\r
-           if( TMath::Abs(daug0->Eta()) < 1.2 && TMath::Abs(daugE0->Eta()) < 0.9 && TMath::Abs(daugE1->Eta()) < 0.9 )\r
-             fHistograms->FillTable("Table_Electrons",18);\r
-         }//else if\r
-       }//gamma o Jpsi\r
-      }//GetNDaughters\r
-    }\r
-\r
-\r
-    /////////////////////End Chic Analysis////////////////////////////\r
-\r
-\r
-    if(TMath::Abs(particle->Eta())> fV0Reader->GetEtaCut() )   continue;\r
-                                       \r
-    if(particle->R()>fV0Reader->GetMaxRCut())  continue; // cuts on distance from collision point\r
-               \r
-    Double_t tmpPhi=particle->Phi();\r
-               \r
-    if(particle->Phi()> TMath::Pi()){\r
-      tmpPhi = particle->Phi()-(2*TMath::Pi());\r
-    }\r
-               \r
-    Double_t rapidity;\r
-    if(particle->Energy() - particle->Pz() == 0 || particle->Energy() + particle->Pz() == 0){\r
-      rapidity=0;\r
-    }\r
-    else{\r
-      rapidity = 0.5*(TMath::Log((particle->Energy()+particle->Pz()) / (particle->Energy()-particle->Pz())));\r
-    }  \r
-               \r
-    //process the gammas\r
-    if (particle->GetPdgCode() == 22){\r
-                       \r
-      if(particle->GetMother(0) >-1 && fStack->Particle(particle->GetMother(0))->GetPdgCode() == 22){\r
-       continue; // no photon as mothers!\r
-      }\r
-\r
-      if(particle->GetMother(0) >= fStack->GetNprimary()){\r
-       continue; // the gamma has a mother, and it is not a primary particle\r
-      }\r
-\r
-      fMCAllGammas.push_back(particle);\r
-                       \r
-      fHistograms->FillHistogram("MC_allGamma_Energy", particle->Energy());\r
-      fHistograms->FillHistogram("MC_allGamma_Pt", particle->Pt());\r
-      fHistograms->FillHistogram("MC_allGamma_Eta", particle->Eta());\r
-      fHistograms->FillHistogram("MC_allGamma_Phi", tmpPhi);\r
-      fHistograms->FillHistogram("MC_allGamma_Rapid", rapidity);\r
-                       \r
-                       \r
-      if(particle->GetMother(0) < 0){   // direct gamma\r
-       fHistograms->FillHistogram("MC_allDirectGamma_Energy",particle->Energy());\r
-       fHistograms->FillHistogram("MC_allDirectGamma_Pt", particle->Pt());\r
-       fHistograms->FillHistogram("MC_allDirectGamma_Eta", particle->Eta());\r
-       fHistograms->FillHistogram("MC_allDirectGamma_Phi", tmpPhi);\r
-       fHistograms->FillHistogram("MC_allDirectGamma_Rapid", rapidity);                                \r
-      }\r
-                       \r
-                       \r
-      // looking for conversion (electron + positron from pairbuilding (= 5) )\r
-      TParticle* ePos = NULL;\r
-      TParticle* eNeg = NULL;\r
-                       \r
-      if(particle->GetNDaughters() >= 2){\r
-       for(Int_t daughterIndex=particle->GetFirstDaughter();daughterIndex<=particle->GetLastDaughter();daughterIndex++){\r
-         TParticle *tmpDaughter = fStack->Particle(daughterIndex);\r
-         if(tmpDaughter->GetUniqueID() == 5){\r
-           if(tmpDaughter->GetPdgCode() == 11){\r
-             eNeg = tmpDaughter;\r
-           }\r
-           else if(tmpDaughter->GetPdgCode() == -11){\r
-             ePos = tmpDaughter;\r
-           }\r
-         }\r
-       }\r
-      }\r
-                       \r
-                       \r
-      if(ePos == NULL || eNeg == NULL){ // means we do not have two daughters from pair production\r
-       continue;\r
-      }\r
-                       \r
-                       \r
-      Double_t ePosPhi = ePos->Phi();\r
-      if(ePos->Phi()> TMath::Pi()) ePosPhi = ePos->Phi()-(2*TMath::Pi());\r
-                       \r
-      Double_t eNegPhi = eNeg->Phi();\r
-      if(eNeg->Phi()> TMath::Pi()) eNegPhi = eNeg->Phi()-(2*TMath::Pi());\r
-                       \r
-                       \r
-      if(ePos->Pt()<fV0Reader->GetPtCut() || eNeg->Pt()<fV0Reader->GetPtCut()){\r
-       continue; // no reconstruction below the Pt cut\r
-      }\r
-                                       \r
-      if(TMath::Abs(ePos->Eta())> fV0Reader->GetEtaCut() || TMath::Abs(eNeg->Eta())> fV0Reader->GetEtaCut()){\r
-       continue;\r
-      }        \r
-                               \r
-      if(ePos->R()>fV0Reader->GetMaxRCut()){\r
-       continue; // cuts on distance from collision point\r
-      }\r
-      \r
-      \r
-      if((TMath::Abs(ePos->Vz()) * fV0Reader->GetLineCutZRSlope()) - fV0Reader->GetLineCutZValue()  > ePos->R()){\r
-       continue;               // line cut to exclude regions where we do not reconstruct\r
-      }                \r
-               \r
-      fHistograms->FillHistogram("MC_ConvGamma_Energy", particle->Energy());\r
-      fHistograms->FillHistogram("MC_ConvGamma_Pt", particle->Pt());\r
-      fHistograms->FillHistogram("MC_ConvGamma_Eta", particle->Eta());\r
-      fHistograms->FillHistogram("MC_ConvGamma_Phi", tmpPhi);\r
-      fHistograms->FillHistogram("MC_ConvGamma_Rapid", rapidity);\r
-      fHistograms->FillHistogram("MC_ConvGamma_Pt_Eta", particle->Pt(),particle->Eta());\r
-                       \r
-      fHistograms->FillHistogram("MC_E_Energy", eNeg->Energy());\r
-      fHistograms->FillHistogram("MC_E_Pt", eNeg->Pt());\r
-      fHistograms->FillHistogram("MC_E_Eta", eNeg->Eta());\r
-      fHistograms->FillHistogram("MC_E_Phi", eNegPhi);\r
-                       \r
-      fHistograms->FillHistogram("MC_P_Energy", ePos->Energy());\r
-      fHistograms->FillHistogram("MC_P_Pt", ePos->Pt());\r
-      fHistograms->FillHistogram("MC_P_Eta", ePos->Eta());\r
-      fHistograms->FillHistogram("MC_P_Phi", ePosPhi);\r
-                       \r
-                       \r
-                       \r
-      //cout << "filled histos for converted gamma, ePos, eNeg" << endl;\r
-                       \r
-      // begin Mapping \r
-      Int_t rBin    = fHistograms->GetRBin(ePos->R());\r
-      Int_t phiBin  = fHistograms->GetPhiBin(particle->Phi());\r
-                       \r
-      TString nameMCMappingPhiR="";\r
-      nameMCMappingPhiR.Form("MC_Conversion_Mapping-Phi%02d-R%02d",phiBin,rBin);\r
-      fHistograms->FillHistogram(nameMCMappingPhiR, ePos->Vz(), particle->Eta());\r
-                       \r
-      TString nameMCMappingPhi="";\r
-      nameMCMappingPhi.Form("MC_Conversion_Mapping-Phi%02d",phiBin);\r
-      fHistograms->FillHistogram(nameMCMappingPhi, particle->Eta());\r
-                       \r
-      TString nameMCMappingR="";\r
-      nameMCMappingR.Form("MC_Conversion_Mapping-R%02d",rBin);\r
-      fHistograms->FillHistogram(nameMCMappingR, particle->Eta());\r
-                       \r
-      TString nameMCMappingPhiInR="";\r
-      nameMCMappingPhiInR.Form("MC_Conversion_Mapping_Phi_R-%02d",rBin);\r
-      fHistograms->FillHistogram(nameMCMappingPhiInR, tmpPhi);\r
-      //end mapping\r
-                       \r
-      fHistograms->FillHistogram("MC_Conversion_R",ePos->R());\r
-      fHistograms->FillHistogram("MC_Conversion_ZR",ePos->Vz(),ePos->R());\r
-      fHistograms->FillHistogram("MC_Conversion_XY",ePos->Vx(),ePos->Vy());\r
-      fHistograms->FillHistogram("MC_Conversion_OpeningAngle",GetMCOpeningAngle(ePos, eNeg));\r
-                       \r
-      //cout << "mapping is done" << endl;\r
-                       \r
-                       \r
-      if(particle->GetMother(0) < 0){ // no mother = direct gamma, still inside converted\r
-       fHistograms->FillHistogram("MC_ConvDirectGamma_Energy",particle->Energy());\r
-       fHistograms->FillHistogram("MC_ConvDirectGamma_Pt", particle->Pt());\r
-       fHistograms->FillHistogram("MC_ConvDirectGamma_Eta", particle->Eta());\r
-       fHistograms->FillHistogram("MC_ConvDirectGamma_Phi", tmpPhi);\r
-       fHistograms->FillHistogram("MC_ConvDirectGamma_Rapid", rapidity);\r
-                               \r
-      } // end direct gamma\r
-      else{   // mother exits \r
-       if( fStack->Particle(particle->GetMother(0))->GetPdgCode()==10441 ||//chic0 \r
-           fStack->Particle(particle->GetMother(0))->GetPdgCode()==20443 ||//psi2S\r
-           fStack->Particle(particle->GetMother(0))->GetPdgCode()==445  //chic2\r
-           ){ \r
-         fMCGammaChic.push_back(particle);\r
-       }\r
-      }  // end if mother exits\r
-    } // end if particle is a photon\r
-               \r
-    if(particle->GetNDaughters() == 2){\r
-                       \r
-      TParticle* daughter0 = (TParticle*)fStack->Particle(particle->GetFirstDaughter());\r
-      TParticle* daughter1 = (TParticle*)fStack->Particle(particle->GetLastDaughter());\r
-                       \r
-      if(daughter0->GetPdgCode() != 22 || daughter1->GetPdgCode() != 22) continue; //check for gamma gamma daughters\r
-                       \r
-                       \r
-                       \r
-      // check for conversions now -> have to pass eta and line cut!\r
-      Bool_t daughter0Electron = kFALSE;\r
-      Bool_t daughter0Positron = kFALSE;\r
-      Bool_t daughter1Electron = kFALSE;\r
-      Bool_t daughter1Positron = kFALSE;\r
-                       \r
-                       \r
-                       \r
-      if(daughter0->GetNDaughters() >= 2){\r
-       for(Int_t TrackIndex=daughter0->GetFirstDaughter();TrackIndex<=daughter0->GetLastDaughter();TrackIndex++){\r
-         TParticle *tmpDaughter = fStack->Particle(TrackIndex);\r
-         if(tmpDaughter->GetUniqueID() == 5){\r
-           if(tmpDaughter->GetPdgCode() == 11){\r
-             if( TMath::Abs(tmpDaughter->Eta()) <= fV0Reader->GetEtaCut() ){\r
-               if( ( TMath::Abs(tmpDaughter->Vz()) * fV0Reader->GetLineCutZRSlope()) - fV0Reader->GetLineCutZValue()  < tmpDaughter->R() ){\r
-                 daughter0Electron = kTRUE;\r
-               }\r
-                                                               \r
-             }\r
-           }\r
-           else if(tmpDaughter->GetPdgCode() == -11){\r
-             if( TMath::Abs(tmpDaughter->Eta()) <= fV0Reader->GetEtaCut() ){\r
-               if( ( TMath::Abs(tmpDaughter->Vz()) * fV0Reader->GetLineCutZRSlope()) - fV0Reader->GetLineCutZValue()  < tmpDaughter->R() ){\r
-                 daughter0Positron = kTRUE;\r
-               }\r
-                                                               \r
-             }\r
-                                                       \r
-           }\r
-         }\r
-       }\r
-      }\r
-                       \r
-                       \r
-       \r
-      if(daughter1->GetNDaughters() >= 2){\r
-       for(Int_t TrackIndex=daughter1->GetFirstDaughter();TrackIndex<=daughter1->GetLastDaughter();TrackIndex++){\r
-         TParticle *tmpDaughter = fStack->Particle(TrackIndex);\r
-         if(tmpDaughter->GetUniqueID() == 5){\r
-           if(tmpDaughter->GetPdgCode() == 11){\r
-             if( TMath::Abs(tmpDaughter->Eta()) <= fV0Reader->GetEtaCut() ){\r
-               if( ( TMath::Abs(tmpDaughter->Vz()) * fV0Reader->GetLineCutZRSlope()) - fV0Reader->GetLineCutZValue()  < tmpDaughter->R() ){\r
-                 daughter1Electron = kTRUE;\r
-               }\r
-                                                               \r
-             }\r
-           }\r
-           else if(tmpDaughter->GetPdgCode() == -11){\r
-             if( TMath::Abs(tmpDaughter->Eta()) <= fV0Reader->GetEtaCut() ){\r
-               if( ( TMath::Abs(tmpDaughter->Vz()) * fV0Reader->GetLineCutZRSlope()) - fV0Reader->GetLineCutZValue()  < tmpDaughter->R() ){\r
-                 daughter1Positron = kTRUE;\r
-               }\r
-                                                               \r
-             }\r
-                                                       \r
-           }\r
-         }\r
-       }\r
-      }\r
-                       \r
-                                                                                               \r
-                       \r
-                       \r
-      if(particle->GetPdgCode()==111){     //Pi0\r
-       if( iTracks >= fStack->GetNprimary()){\r
-         fHistograms->FillHistogram("MC_Pi0_Secondaries_Eta", particle->Eta());\r
-         fHistograms->FillHistogram("MC_Pi0_Secondaries_Rapid", rapidity);\r
-         fHistograms->FillHistogram("MC_Pi0_Secondaries_Phi", tmpPhi);\r
-         fHistograms->FillHistogram("MC_Pi0_Secondaries_Pt", particle->Pt());\r
-         fHistograms->FillHistogram("MC_Pi0_Secondaries_Energy", particle->Energy());\r
-         fHistograms->FillHistogram("MC_Pi0_Secondaries_R", particle->R());\r
-         fHistograms->FillHistogram("MC_Pi0_Secondaries_ZR", particle->Vz(),particle->R());\r
-         fHistograms->FillHistogram("MC_Pi0_Secondaries_GammaDaughter_OpeningAngle", GetMCOpeningAngle(daughter0,daughter1));\r
-         fHistograms->FillHistogram("MC_Pi0_Secondaries_XY", particle->Vx(),particle->Vy());//only fill from one daughter to avoid multiple filling\r
-                                       \r
-         if(TMath::Abs(daughter0->Eta()) <= fV0Reader->GetEtaCut() && TMath::Abs(daughter1->Eta()) <= fV0Reader->GetEtaCut() ){\r
-           fHistograms->FillHistogram("MC_Pi0_Secondaries_Pt_Eta_withinAcceptance", particle->Pt(),particle->Eta());\r
-           fHistograms->FillHistogram("MC_Pi0_Secondaries_Pt_Rapid_withinAcceptance", particle->Pt(),rapidity);\r
-           if(daughter0Electron && daughter0Positron && daughter1Electron && daughter1Positron){\r
-             fHistograms->FillHistogram("MC_Pi0_Secondaries_Pt_Eta_ConvGamma_withinAcceptance", particle->Pt(),particle->Eta());\r
-             fHistograms->FillHistogram("MC_Pi0_Secondaries_Pt_Rapid_ConvGamma_withinAcceptance", particle->Pt(),rapidity);\r
-           }\r
-         }\r
-       }\r
-       else{\r
-         fHistograms->FillHistogram("MC_Pi0_Eta", particle->Eta());    \r
-         fHistograms->FillHistogram("MC_Pi0_Rapid", rapidity);\r
-         fHistograms->FillHistogram("MC_Pi0_Phi", tmpPhi);\r
-         fHistograms->FillHistogram("MC_Pi0_Pt", particle->Pt());\r
-         fHistograms->FillHistogram("MC_Pi0_Energy", particle->Energy());\r
-         fHistograms->FillHistogram("MC_Pi0_R", particle->R());\r
-         fHistograms->FillHistogram("MC_Pi0_ZR", particle->Vz(),particle->R());\r
-         fHistograms->FillHistogram("MC_Pi0_GammaDaughter_OpeningAngle", GetMCOpeningAngle(daughter0,daughter1));\r
-         fHistograms->FillHistogram("MC_Pi0_XY", particle->Vx(), particle->Vy());//only fill from one daughter to avoid multiple filling\r
-                                       \r
-         if(TMath::Abs(daughter0->Eta()) <= fV0Reader->GetEtaCut() && TMath::Abs(daughter1->Eta()) <= fV0Reader->GetEtaCut() ){\r
-           fHistograms->FillHistogram("MC_Pi0_Pt_Eta_withinAcceptance", particle->Pt(),particle->Eta());\r
-           fHistograms->FillHistogram("MC_Pi0_Pt_Rapid_withinAcceptance", particle->Pt(),rapidity);\r
-           if(daughter0Electron && daughter0Positron && daughter1Electron && daughter1Positron){\r
-             fHistograms->FillHistogram("MC_Pi0_Pt_Eta_ConvGamma_withinAcceptance", particle->Pt(),particle->Eta());\r
-             fHistograms->FillHistogram("MC_Pi0_Pt_Rapid_ConvGamma_withinAcceptance", particle->Pt(),rapidity);\r
-           }\r
-         }\r
-       }\r
-      }\r
-                       \r
-      if(particle->GetPdgCode()==221){   //Eta\r
-       fHistograms->FillHistogram("MC_Eta_Eta", particle->Eta());\r
-       fHistograms->FillHistogram("MC_Eta_Rapid", rapidity);\r
-       fHistograms->FillHistogram("MC_Eta_Phi",tmpPhi);\r
-       fHistograms->FillHistogram("MC_Eta_Pt", particle->Pt());\r
-       fHistograms->FillHistogram("MC_Eta_Energy", particle->Energy());\r
-       fHistograms->FillHistogram("MC_Eta_R", particle->R());\r
-       fHistograms->FillHistogram("MC_Eta_ZR", particle->Vz(),particle->R());\r
-       fHistograms->FillHistogram("MC_Eta_GammaDaughter_OpeningAngle", GetMCOpeningAngle(daughter0,daughter1));\r
-       fHistograms->FillHistogram("MC_Eta_XY", particle->Vx(), particle->Vy());//only fill from one daughter to avoid multiple filling\r
-                               \r
-       if(TMath::Abs(daughter0->Eta()) <= fV0Reader->GetEtaCut() && TMath::Abs(daughter1->Eta()) <= fV0Reader->GetEtaCut() ){\r
-         fHistograms->FillHistogram("MC_Eta_Pt_Eta_withinAcceptance", particle->Pt(),particle->Eta());\r
-         fHistograms->FillHistogram("MC_Eta_Pt_Rapid_withinAcceptance", particle->Pt(),rapidity);\r
-         if(daughter0Electron && daughter0Positron && daughter1Electron && daughter1Positron){\r
-           fHistograms->FillHistogram("MC_Eta_Pt_Eta_ConvGamma_withinAcceptance", particle->Pt(),particle->Eta());\r
-           fHistograms->FillHistogram("MC_Eta_Pt_Rapid_ConvGamma_withinAcceptance", particle->Pt(),rapidity);\r
-         }\r
-                                       \r
-       }\r
-                               \r
-      }\r
-                       \r
-      // all motherparticles with 2 gammas as daughters\r
-      fHistograms->FillHistogram("MC_Mother_R", particle->R());\r
-      fHistograms->FillHistogram("MC_Mother_ZR", particle->Vz(),particle->R());\r
-      fHistograms->FillHistogram("MC_Mother_XY", particle->Vx(),particle->Vy());\r
-      fHistograms->FillHistogram("MC_Mother_Mass", particle->GetCalcMass());\r
-      fHistograms->FillHistogram("MC_Mother_GammaDaughter_OpeningAngle", GetMCOpeningAngle(daughter0,daughter1));\r
-      fHistograms->FillHistogram("MC_Mother_Energy", particle->Energy());\r
-      fHistograms->FillHistogram("MC_Mother_Pt", particle->Pt());\r
-      fHistograms->FillHistogram("MC_Mother_Eta", particle->Eta());\r
-      fHistograms->FillHistogram("MC_Mother_Rapid", rapidity);\r
-      fHistograms->FillHistogram("MC_Mother_Phi",tmpPhi);\r
-      fHistograms->FillHistogram("MC_Mother_InvMass_vs_Pt",particle->GetMass(),particle->Pt());                        \r
-      if(TMath::Abs(daughter0->Eta()) <= fV0Reader->GetEtaCut() && TMath::Abs(daughter1->Eta()) <= fV0Reader->GetEtaCut() ){\r
-       fHistograms->FillHistogram("MC_Mother_Pt_Eta_withinAcceptance", particle->Pt(),particle->Eta());\r
-       fHistograms->FillHistogram("MC_Mother_Pt_Rapid_withinAcceptance", particle->Pt(),rapidity);\r
-       fHistograms->FillHistogram("MC_Mother_InvMass_vs_Pt_withinAcceptance",particle->GetMass(),particle->Pt());                      \r
-       if(daughter0Electron && daughter0Positron && daughter1Electron && daughter1Positron){\r
-         fHistograms->FillHistogram("MC_Mother_Pt_Eta_ConvGamma_withinAcceptance", particle->Pt(),particle->Eta());\r
-         fHistograms->FillHistogram("MC_Mother_Pt_Rapid_ConvGamma_withinAcceptance", particle->Pt(),rapidity);\r
-         fHistograms->FillHistogram("MC_Mother_InvMass_vs_Pt_ConvGamma_withinAcceptance",particle->GetMass(),particle->Pt());                  \r
-\r
-       }\r
-                               \r
-                               \r
-      }\r
-                       \r
-      //cout << "mother histos are filled" << endl;\r
-                       \r
-    } // end if(particle->GetNDaughters() == 2)\r
-               \r
-  }// end for (Int_t iTracks = 0; iTracks < fStack->GetNtrack(); iTracks++)\r
-       \r
-  //cout << "right before the end of processMCdata" << endl;\r
-       \r
-} // end ProcessMCData\r
-\r
-\r
-\r
-void AliAnalysisTaskGammaConversion::FillNtuple(){\r
-  //Fills the ntuple with the different values\r
-\r
-  if(fGammaNtuple == NULL){\r
-    return;\r
-  }\r
-  Int_t numberOfV0s = fV0Reader->GetNumberOfV0s();\r
-  for(Int_t i=0;i<numberOfV0s;i++){\r
-    Float_t values[27] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};\r
-    AliESDv0 * cV0 = fV0Reader->GetV0(i);\r
-    Double_t negPID=0;\r
-    Double_t posPID=0;\r
-    fV0Reader->GetPIDProbability(negPID,posPID);\r
-    values[0]=cV0->GetOnFlyStatus();\r
-    values[1]=fV0Reader->CheckForPrimaryVertex();\r
-    values[2]=negPID;\r
-    values[3]=posPID;\r
-    values[4]=fV0Reader->GetX();\r
-    values[5]=fV0Reader->GetY();\r
-    values[6]=fV0Reader->GetZ();\r
-    values[7]=fV0Reader->GetXYRadius();\r
-    values[8]=fV0Reader->GetMotherCandidateNDF();\r
-    values[9]=fV0Reader->GetMotherCandidateChi2();\r
-    values[10]=fV0Reader->GetMotherCandidateEnergy();\r
-    values[11]=fV0Reader->GetMotherCandidateEta();\r
-    values[12]=fV0Reader->GetMotherCandidatePt();\r
-    values[13]=fV0Reader->GetMotherCandidateMass();\r
-    values[14]=fV0Reader->GetMotherCandidateWidth();\r
-    //    values[15]=fV0Reader->GetMotherMCParticle()->Pt();   MOVED TO THE END, HAS TO BE CALLED AFTER HasSameMother NB: still has the same entry in the array\r
-    values[16]=fV0Reader->GetOpeningAngle();\r
-    values[17]=fV0Reader->GetNegativeTrackEnergy();\r
-    values[18]=fV0Reader->GetNegativeTrackPt();\r
-    values[19]=fV0Reader->GetNegativeTrackEta();\r
-    values[20]=fV0Reader->GetNegativeTrackPhi();\r
-    values[21]=fV0Reader->GetPositiveTrackEnergy();\r
-    values[22]=fV0Reader->GetPositiveTrackPt();\r
-    values[23]=fV0Reader->GetPositiveTrackEta();\r
-    values[24]=fV0Reader->GetPositiveTrackPhi();\r
-    values[25]=fV0Reader->HasSameMCMother();\r
-    if(values[25] != 0){\r
-      values[26]=fV0Reader->GetMotherMCParticlePDGCode();\r
-      values[15]=fV0Reader->GetMotherMCParticle()->Pt();\r
-    }\r
-    fTotalNumberOfAddedNtupleEntries++;\r
-    fGammaNtuple->Fill(values);\r
-  }\r
-  fV0Reader->ResetV0IndexNumber();\r
-       \r
-}\r
-\r
-void AliAnalysisTaskGammaConversion::ProcessV0sNoCut(){\r
-  // Process all the V0's without applying any cuts to it\r
-\r
-  Int_t numberOfV0s = fV0Reader->GetNumberOfV0s();\r
-  for(Int_t i=0;i<numberOfV0s;i++){\r
-    /*AliESDv0 * cV0 = */fV0Reader->GetV0(i);\r
-\r
-    if(fV0Reader->CheckForPrimaryVertex() == kFALSE){\r
-      return;\r
-    }\r
-    \r
-    if(fDoMCTruth){\r
-      \r
-      if(fV0Reader->HasSameMCMother() == kFALSE){\r
-       continue;\r
-      }\r
-               \r
-      TParticle * negativeMC = (TParticle*)fV0Reader->GetNegativeMCParticle();\r
-      TParticle * positiveMC = (TParticle*)fV0Reader->GetPositiveMCParticle();\r
-\r
-      if(TMath::Abs(negativeMC->GetPdgCode())!=11 || TMath::Abs(positiveMC->GetPdgCode())!=11){\r
-       continue;\r
-      }\r
-      if(negativeMC->GetPdgCode()==positiveMC->GetPdgCode()){\r
-       continue;\r
-      }\r
-       \r
-      if(fV0Reader->GetMotherMCParticle()->GetPdgCode() == 22){\r
-      \r
-       fHistograms->FillHistogram("ESD_NoCutConvGamma_Pt", fV0Reader->GetMotherCandidatePt());\r
-       fHistograms->FillHistogram("ESD_NoCutConvGamma_Energy", fV0Reader->GetMotherCandidateEnergy());\r
-       fHistograms->FillHistogram("ESD_NoCutConvGamma_Eta", fV0Reader->GetMotherCandidateEta());                               \r
-       fHistograms->FillHistogram("ESD_NoCutConvGamma_Phi", fV0Reader->GetMotherCandidatePhi());\r
-       fHistograms->FillHistogram("ESD_NoCutConvGamma_Mass", fV0Reader->GetMotherCandidateMass());\r
-       fHistograms->FillHistogram("ESD_NoCutConvGamma_Width", fV0Reader->GetMotherCandidateWidth());\r
-       fHistograms->FillHistogram("ESD_NoCutConvGamma_Chi2", fV0Reader->GetMotherCandidateChi2());\r
-       fHistograms->FillHistogram("ESD_NoCutConvGamma_NDF", fV0Reader->GetMotherCandidateNDF());\r
-       fHistograms->FillHistogram("ESD_NoCutConvGamma_Rapid", fV0Reader->GetMotherCandidateRapidity());\r
-       fHistograms->FillHistogram("ESD_NoCutConvGamma_Pt_Eta", fV0Reader->GetMotherCandidatePt(),fV0Reader->GetMotherCandidateEta());\r
-       \r
-       fHistograms->FillHistogram("ESD_NoCutConversion_XY", fV0Reader->GetX(),fV0Reader->GetY());\r
-       fHistograms->FillHistogram("ESD_NoCutConversion_R", fV0Reader->GetXYRadius());\r
-       fHistograms->FillHistogram("ESD_NoCutConversion_ZR", fV0Reader->GetZ(),fV0Reader->GetXYRadius());\r
-       fHistograms->FillHistogram("ESD_NoCutConversion_OpeningAngle", fV0Reader->GetOpeningAngle());\r
-       \r
-       /*\r
-         ESD_NoCutConvGamma_Pt\r
-         ESD_NoCutConvGamma_Energy\r
-         ESD_NoCutConvGamma_Eta\r
-         ESD_NoCutConvGamma_Phi\r
-         ESD_NoCutConvGamma_Mass\r
-         ESD_NoCutConvGamma_Width\r
-         ESD_NoCutConvGamma_Chi2\r
-         ESD_NoCutConvGamma_NDF\r
-         ESD_NoCutConvGamma_PtvsEta\r
-         ESD_NoCutConversion_XY\r
-         ESD_NoCutConversion_R\r
-         ESD_NoCutConversion_ZR\r
-         ESD_NoCutConversion_OpeningAngle\r
-       */\r
-      }\r
-    }\r
-  }\r
-  fV0Reader->ResetV0IndexNumber();\r
-}\r
-\r
-void AliAnalysisTaskGammaConversion::ProcessV0s(){\r
-  // see header file for documentation\r
-       \r
-  if(fWriteNtuple == kTRUE){\r
-    FillNtuple();\r
-  }\r
-       \r
-  Int_t nSurvivingV0s=0;\r
-  while(fV0Reader->NextV0()){\r
-    nSurvivingV0s++;\r
-               \r
-               \r
-    //-------------------------- filling v0 information -------------------------------------\r
-    fHistograms->FillHistogram("ESD_Conversion_R", fV0Reader->GetXYRadius());\r
-    fHistograms->FillHistogram("ESD_Conversion_ZR", fV0Reader->GetZ(),fV0Reader->GetXYRadius());\r
-    fHistograms->FillHistogram("ESD_Conversion_XY", fV0Reader->GetX(),fV0Reader->GetY());\r
-    fHistograms->FillHistogram("ESD_Conversion_OpeningAngle", fV0Reader->GetOpeningAngle());    \r
-               \r
-    fHistograms->FillHistogram("ESD_E_Energy", fV0Reader->GetNegativeTrackEnergy());\r
-    fHistograms->FillHistogram("ESD_E_Pt", fV0Reader->GetNegativeTrackPt());\r
-    fHistograms->FillHistogram("ESD_E_Eta", fV0Reader->GetNegativeTrackEta());\r
-    fHistograms->FillHistogram("ESD_E_Phi", fV0Reader->GetNegativeTrackPhi());\r
-               \r
-    fHistograms->FillHistogram("ESD_P_Energy", fV0Reader->GetPositiveTrackEnergy());\r
-    fHistograms->FillHistogram("ESD_P_Pt", fV0Reader->GetPositiveTrackPt());\r
-    fHistograms->FillHistogram("ESD_P_Eta", fV0Reader->GetPositiveTrackEta());\r
-    fHistograms->FillHistogram("ESD_P_Phi", fV0Reader->GetPositiveTrackPhi());\r
-               \r
-    fHistograms->FillHistogram("ESD_ConvGamma_Energy", fV0Reader->GetMotherCandidateEnergy());\r
-    fHistograms->FillHistogram("ESD_ConvGamma_Pt", fV0Reader->GetMotherCandidatePt());\r
-    fHistograms->FillHistogram("ESD_ConvGamma_Eta", fV0Reader->GetMotherCandidateEta());\r
-    fHistograms->FillHistogram("ESD_ConvGamma_Phi", fV0Reader->GetMotherCandidatePhi());\r
-    fHistograms->FillHistogram("ESD_ConvGamma_Mass", fV0Reader->GetMotherCandidateMass());\r
-    fHistograms->FillHistogram("ESD_ConvGamma_Width", fV0Reader->GetMotherCandidateWidth());\r
-    fHistograms->FillHistogram("ESD_ConvGamma_Chi2", fV0Reader->GetMotherCandidateChi2());\r
-    fHistograms->FillHistogram("ESD_ConvGamma_NDF", fV0Reader->GetMotherCandidateNDF());\r
-    fHistograms->FillHistogram("ESD_ConvGamma_Rapid", fV0Reader->GetMotherCandidateRapidity());\r
-    fHistograms->FillHistogram("ESD_ConvGamma_Pt_Eta", fV0Reader->GetMotherCandidatePt(),fV0Reader->GetMotherCandidateEta());\r
-               \r
-               \r
-    // begin mapping\r
-    Int_t rBin    = fHistograms->GetRBin(fV0Reader->GetXYRadius());\r
-    Int_t phiBin  = fHistograms->GetPhiBin(fV0Reader->GetNegativeTrackPhi());\r
-    Double_t motherCandidateEta= fV0Reader->GetMotherCandidateEta();\r
-               \r
-    TString nameESDMappingPhiR="";\r
-    nameESDMappingPhiR.Form("ESD_Conversion_Mapping-Phi%02d-R%02d",phiBin,rBin);\r
-    fHistograms->FillHistogram(nameESDMappingPhiR, fV0Reader->GetZ(), motherCandidateEta);\r
-               \r
-    TString nameESDMappingPhi="";\r
-    nameESDMappingPhi.Form("ESD_Conversion_Mapping-Phi%02d",phiBin);\r
-    fHistograms->FillHistogram(nameESDMappingPhi, fV0Reader->GetZ(), motherCandidateEta);\r
-               \r
-    TString nameESDMappingR="";\r
-    nameESDMappingR.Form("ESD_Conversion_Mapping-R%02d",rBin);\r
-    fHistograms->FillHistogram(nameESDMappingR, fV0Reader->GetZ(), motherCandidateEta);  \r
-               \r
-    TString nameESDMappingPhiInR="";\r
-    nameESDMappingPhiInR.Form("ESD_Conversion_Mapping_Phi_R-%02d",rBin);\r
-    fHistograms->FillHistogram(nameESDMappingPhiInR, fV0Reader->GetMotherCandidatePhi());\r
-    // end mapping\r
-               \r
-    fKFReconstructedGammas.push_back(*fV0Reader->GetMotherCandidateKFCombination());\r
-    fElectronv1.push_back(fV0Reader->GetCurrentV0()->GetPindex());\r
-    fElectronv2.push_back(fV0Reader->GetCurrentV0()->GetNindex());\r
-\r
-               \r
-    //----------------------------------- checking for "real" conversions (MC match) --------------------------------------\r
-    if(fDoMCTruth){\r
-                       \r
-      if(fV0Reader->HasSameMCMother() == kFALSE){\r
-       fIsTrueReconstructedGammas.push_back(kFALSE);\r
-       continue;\r
-      }\r
-      \r
-               \r
-      TParticle * negativeMC = (TParticle*)fV0Reader->GetNegativeMCParticle();\r
-      TParticle * positiveMC = (TParticle*)fV0Reader->GetPositiveMCParticle();\r
-\r
-      if(TMath::Abs(negativeMC->GetPdgCode())!=11 || TMath::Abs(positiveMC->GetPdgCode())!=11){\r
-       fIsTrueReconstructedGammas.push_back(kFALSE);\r
-       continue;\r
-      }\r
-      if(negativeMC->GetPdgCode()==positiveMC->GetPdgCode()){\r
-       fIsTrueReconstructedGammas.push_back(kFALSE);\r
-       continue;\r
-      }\r
-       \r
-      if(fV0Reader->GetMotherMCParticle()->GetPdgCode() == 22){\r
-       fIsTrueReconstructedGammas.push_back(kTRUE);\r
-                               \r
-       fHistograms->FillHistogram("ESD_TrueConvGamma_Pt", fV0Reader->GetMotherCandidatePt());\r
-       fHistograms->FillHistogram("ESD_TrueConvGamma_Energy", fV0Reader->GetMotherCandidateEnergy());\r
-       fHistograms->FillHistogram("ESD_TrueConvGamma_Eta", fV0Reader->GetMotherCandidateEta());                                \r
-       fHistograms->FillHistogram("ESD_TrueConvGamma_Phi", fV0Reader->GetMotherCandidatePhi());\r
-       fHistograms->FillHistogram("ESD_TrueConvGamma_Mass", fV0Reader->GetMotherCandidateMass());\r
-       fHistograms->FillHistogram("ESD_TrueConvGamma_Width", fV0Reader->GetMotherCandidateWidth());\r
-       fHistograms->FillHistogram("ESD_TrueConvGamma_Chi2", fV0Reader->GetMotherCandidateChi2());\r
-       fHistograms->FillHistogram("ESD_TrueConvGamma_NDF", fV0Reader->GetMotherCandidateNDF());\r
-       fHistograms->FillHistogram("ESD_TrueConvGamma_Pt_Eta", fV0Reader->GetMotherCandidatePt(),fV0Reader->GetMotherCandidateEta());\r
-       fHistograms->FillHistogram("ESD_TrueConvGamma_Rapid", fV0Reader->GetMotherCandidateRapidity());\r
-       fHistograms->FillHistogram("ESD_TrueConvGamma_TrackLength", /*fV0Reader->GetNegativeTrackLength()*/fV0Reader->GetNegativeNTPCClusters());\r
-       fHistograms->FillHistogram("ESD_TrueConvGamma_TrackLength", /*fV0Reader->GetPositiveTrackLength()*/fV0Reader->GetPositiveNTPCClusters());\r
-       fHistograms->FillHistogram("ESD_TrueConvGamma_TrackLengthVSInvMass",/*fV0Reader->GetNegativeTrackLength()*/fV0Reader->GetNegativeNTPCClusters(),fV0Reader->GetMotherCandidateMass());\r
-       fHistograms->FillHistogram("ESD_TrueConvGamma_TrackLengthVSInvMass",/*fV0Reader->GetPositiveTrackLength()*/fV0Reader->GetPositiveNTPCClusters(),fV0Reader->GetMotherCandidateMass());\r
-       \r
-       fHistograms->FillHistogram("ESD_TrueConversion_XY", fV0Reader->GetX(),fV0Reader->GetY());\r
-       fHistograms->FillHistogram("ESD_TrueConversion_R", fV0Reader->GetXYRadius());\r
-       fHistograms->FillHistogram("ESD_TrueConversion_ZR", fV0Reader->GetZ(),fV0Reader->GetXYRadius());\r
-       fHistograms->FillHistogram("ESD_TrueConversion_OpeningAngle", fV0Reader->GetOpeningAngle());\r
-\r
-       \r
-       /*\r
-         fHistograms->FillHistogram("ESD_TrueConversion_XY", fV0Reader->GetX(),fV0Reader->GetY());\r
-         fHistograms->FillHistogram("ESD_TrueConversion_R", fV0Reader->GetXYRadius());\r
-         fHistograms->FillHistogram("ESD_TrueConversion_ZR", fV0Reader->GetZ(),fV0Reader->GetXYRadius());\r
-         fHistograms->FillHistogram("ESD_TrueConversion_OpeningAngle", fV0Reader->GetOpeningAngle());\r
-       */\r
-\r
-\r
-\r
-       //resolution\r
-       Double_t mcpt   = fV0Reader->GetMotherMCParticle()->Pt();\r
-       Double_t esdpt  = fV0Reader->GetMotherCandidatePt();\r
-       Double_t resdPt = 0;\r
-       if(mcpt != 0){\r
-         resdPt = ((esdpt - mcpt)/mcpt)*100;\r
-       }\r
-                               \r
-       fHistograms->FillHistogram("Resolution_dPt", mcpt, resdPt);\r
-       fHistograms->FillHistogram("Resolution_MC_Pt", mcpt);\r
-       fHistograms->FillHistogram("Resolution_ESD_Pt", esdpt);\r
-                               \r
-       Double_t resdZ = 0;\r
-       if(fV0Reader->GetNegativeMCParticle()->Vz() != 0){\r
-         resdZ = ((fV0Reader->GetZ() -fV0Reader->GetNegativeMCParticle()->Vz())/fV0Reader->GetNegativeMCParticle()->Vz())*100;\r
-       }\r
-                               \r
-       fHistograms->FillHistogram("Resolution_dZ", fV0Reader->GetNegativeMCParticle()->Vz(), resdZ);\r
-       fHistograms->FillHistogram("Resolution_MC_Z", fV0Reader->GetNegativeMCParticle()->Vz());\r
-       fHistograms->FillHistogram("Resolution_ESD_Z", fV0Reader->GetZ());\r
-                               \r
-       Double_t resdR = 0;\r
-       if(fV0Reader->GetNegativeMCParticle()->R() != 0){\r
-         resdR = ((fV0Reader->GetXYRadius() - fV0Reader->GetNegativeMCParticle()->R())/fV0Reader->GetNegativeMCParticle()->R())*100;\r
-       }\r
-\r
-       fHistograms->FillHistogram("Resolution_dR", fV0Reader->GetNegativeMCParticle()->R(), resdR);\r
-       fHistograms->FillHistogram("Resolution_MC_R", fV0Reader->GetNegativeMCParticle()->R());\r
-       fHistograms->FillHistogram("Resolution_ESD_R", fV0Reader->GetXYRadius());\r
-       fHistograms->FillHistogram("Resolution_dR_dPt", resdR, resdPt);\r
-      }//if(fV0Reader->GetMotherMCParticle()->GetPdgCode() == 22)\r
-      else{\r
-       fIsTrueReconstructedGammas.push_back(kFALSE);\r
-      }\r
-    }//if(fDoMCTruth)\r
-  }//while(fV0Reader->NextV0)\r
-  fHistograms->FillHistogram("ESD_NumberOfSurvivingV0s", nSurvivingV0s);\r
-  fHistograms->FillHistogram("ESD_NumberOfV0s", fV0Reader->GetNumberOfV0s());\r
-       \r
-  //cout << "nearly at the end of doMCTruth" << endl;\r
-       \r
-}\r
-\r
-void AliAnalysisTaskGammaConversion::ProcessGammasForNeutralMesonAnalysis(){\r
-  // see header file for documentation\r
-       \r
-  for(UInt_t firstGammaIndex=0;firstGammaIndex<fKFReconstructedGammas.size();firstGammaIndex++){\r
-    for(UInt_t secondGammaIndex=firstGammaIndex+1;secondGammaIndex<fKFReconstructedGammas.size();secondGammaIndex++){\r
-                       \r
-      AliKFParticle * twoGammaDecayCandidateDaughter0 = &fKFReconstructedGammas[firstGammaIndex];\r
-      AliKFParticle * twoGammaDecayCandidateDaughter1 = &fKFReconstructedGammas[secondGammaIndex];\r
-      \r
-      if(fElectronv1[firstGammaIndex]==fElectronv1[secondGammaIndex] || fElectronv1[firstGammaIndex]==fElectronv2[secondGammaIndex]){\r
-       continue;\r
-      }\r
-      if(fElectronv2[firstGammaIndex]==fElectronv1[secondGammaIndex] || fElectronv2[firstGammaIndex]==fElectronv2[secondGammaIndex]){\r
-       continue;\r
-      }\r
-\r
-      /*\r
-       if(fIsTrueReconstructedGammas[firstGammaIndex] == kFALSE || fIsTrueReconstructedGammas[secondGammaIndex] == kFALSE){\r
-       continue;\r
-       }\r
-      */\r
-\r
-      AliKFParticle *twoGammaCandidate = new AliKFParticle(*twoGammaDecayCandidateDaughter0,*twoGammaDecayCandidateDaughter1);\r
-                       \r
-      Double_t massTwoGammaCandidate = 0.;\r
-      Double_t widthTwoGammaCandidate = 0.;\r
-      Double_t chi2TwoGammaCandidate =10000.;  \r
-      twoGammaCandidate->GetMass(massTwoGammaCandidate,widthTwoGammaCandidate);\r
-      if(twoGammaCandidate->GetNDF()>0){\r
-       chi2TwoGammaCandidate = twoGammaCandidate->GetChi2()/twoGammaCandidate->GetNDF();\r
-                               \r
-       if(chi2TwoGammaCandidate>0 && chi2TwoGammaCandidate<fV0Reader->GetChi2CutMeson()){                                      \r
-                                       \r
-         TVector3 momentumVectorTwoGammaCandidate(twoGammaCandidate->GetPx(),twoGammaCandidate->GetPy(),twoGammaCandidate->GetPz());\r
-         TVector3 spaceVectorTwoGammaCandidate(twoGammaCandidate->GetX(),twoGammaCandidate->GetY(),twoGammaCandidate->GetZ());\r
-                                       \r
-         Double_t openingAngleTwoGammaCandidate = twoGammaDecayCandidateDaughter0->GetAngle(*twoGammaDecayCandidateDaughter1);                                 \r
-         Double_t rapidity;\r
-         if(twoGammaCandidate->GetE() - twoGammaCandidate->GetPz() == 0 || twoGammaCandidate->GetE() + twoGammaCandidate->GetPz() == 0){\r
-           rapidity=0;\r
-         }\r
-         else{\r
-           rapidity = 0.5*(TMath::Log((twoGammaCandidate->GetE() +twoGammaCandidate->GetPz()) / (twoGammaCandidate->GetE()-twoGammaCandidate->GetPz())));\r
-         }\r
-                                       \r
-         if(openingAngleTwoGammaCandidate < fMinOpeningAngleGhostCut) continue;   // minimum opening angle to avoid using ghosttracks\r
-\r
-         fHistograms->FillHistogram("ESD_Mother_GammaDaughter_OpeningAngle", openingAngleTwoGammaCandidate);\r
-         fHistograms->FillHistogram("ESD_Mother_Energy", twoGammaCandidate->GetE());\r
-         fHistograms->FillHistogram("ESD_Mother_Pt", momentumVectorTwoGammaCandidate.Pt());\r
-         fHistograms->FillHistogram("ESD_Mother_Eta", momentumVectorTwoGammaCandidate.Eta());\r
-         fHistograms->FillHistogram("ESD_Mother_Rapid", rapidity);                                     \r
-         fHistograms->FillHistogram("ESD_Mother_Phi", spaceVectorTwoGammaCandidate.Phi());\r
-         fHistograms->FillHistogram("ESD_Mother_Mass", massTwoGammaCandidate);\r
-         fHistograms->FillHistogram("ESD_Mother_R", spaceVectorTwoGammaCandidate.Pt());    // Pt in Space == R!!!\r
-         fHistograms->FillHistogram("ESD_Mother_ZR", twoGammaCandidate->GetZ(), spaceVectorTwoGammaCandidate.Pt());\r
-         fHistograms->FillHistogram("ESD_Mother_XY", twoGammaCandidate->GetX(), twoGammaCandidate->GetY());\r
-         fHistograms->FillHistogram("ESD_Mother_InvMass_vs_Pt",massTwoGammaCandidate ,momentumVectorTwoGammaCandidate.Pt());\r
-         fHistograms->FillHistogram("ESD_Mother_InvMass",massTwoGammaCandidate);\r
-       }\r
-      }\r
-      delete twoGammaCandidate;\r
-                       \r
-      //cout << "nearly at the end of processgamma for neutral meson ..." << endl;\r
-                       \r
-                       \r
-    }\r
-  }\r
-}\r
-\r
-void AliAnalysisTaskGammaConversion::CalculateBackground(){\r
-  // see header file for documentation\r
-       \r
-  vector<AliKFParticle> vectorCurrentEventGoodV0s = fV0Reader->GetCurrentEventGoodV0s();\r
-  vector<AliKFParticle> vectorPreviousEventGoodV0s = fV0Reader->GetPreviousEventGoodV0s();\r
-  for(UInt_t iCurrent=0;iCurrent<vectorCurrentEventGoodV0s.size();iCurrent++){\r
-    AliKFParticle * currentEventGoodV0 = &vectorCurrentEventGoodV0s.at(iCurrent);\r
-    for(UInt_t iPrevious=0;iPrevious<vectorPreviousEventGoodV0s.size();iPrevious++){\r
-      AliKFParticle * previousGoodV0 = &vectorPreviousEventGoodV0s.at(iPrevious);\r
-\r
-      AliKFParticle *backgroundCandidate = new AliKFParticle(*currentEventGoodV0,*previousGoodV0);\r
-                       \r
-      Double_t massBG =0.;\r
-      Double_t widthBG = 0.;\r
-      Double_t chi2BG =10000.; \r
-      backgroundCandidate->GetMass(massBG,widthBG);\r
-      if(backgroundCandidate->GetNDF()>0){\r
-       chi2BG = backgroundCandidate->GetChi2()/backgroundCandidate->GetNDF();\r
-       if(chi2BG>0 && chi2BG<fV0Reader->GetChi2CutMeson()){\r
-                                       \r
-         TVector3 MomentumVectorbackgroundCandidate(backgroundCandidate->GetPx(),backgroundCandidate->GetPy(),backgroundCandidate->GetPz());\r
-         TVector3 SpaceVectorbackgroundCandidate(backgroundCandidate->GetX(),backgroundCandidate->GetY(),backgroundCandidate->GetZ());\r
-                                       \r
-         Double_t openingAngleBG = currentEventGoodV0->GetAngle(*previousGoodV0);\r
-\r
-         Double_t rapidity;\r
-         if(backgroundCandidate->GetE() - backgroundCandidate->GetPz() == 0 || backgroundCandidate->GetE() + backgroundCandidate->GetPz() == 0) rapidity=0;\r
-         else rapidity = 0.5*(TMath::Log((backgroundCandidate->GetE() +backgroundCandidate->GetPz()) / (backgroundCandidate->GetE()-backgroundCandidate->GetPz())));\r
-\r
-                                       \r
-                                       \r
-                                       \r
-         if(openingAngleBG < fMinOpeningAngleGhostCut ) continue;   // minimum opening angle to avoid using ghosttracks\r
-                       \r
-                                       \r
-         fHistograms->FillHistogram("ESD_Background_GammaDaughter_OpeningAngle", openingAngleBG);\r
-         fHistograms->FillHistogram("ESD_Background_Energy", backgroundCandidate->GetE());\r
-         fHistograms->FillHistogram("ESD_Background_Pt",  MomentumVectorbackgroundCandidate.Pt());\r
-         fHistograms->FillHistogram("ESD_Background_Eta", MomentumVectorbackgroundCandidate.Eta());\r
-         fHistograms->FillHistogram("ESD_Background_Rapidity", rapidity);\r
-         fHistograms->FillHistogram("ESD_Background_Phi", SpaceVectorbackgroundCandidate.Phi());\r
-         fHistograms->FillHistogram("ESD_Background_Mass", massBG);\r
-         fHistograms->FillHistogram("ESD_Background_R", SpaceVectorbackgroundCandidate.Pt());  // Pt in Space == R!!!!\r
-         fHistograms->FillHistogram("ESD_Background_ZR", backgroundCandidate->GetZ(), SpaceVectorbackgroundCandidate.Pt());\r
-         fHistograms->FillHistogram("ESD_Background_XY", backgroundCandidate->GetX(), backgroundCandidate->GetY());\r
-         fHistograms->FillHistogram("ESD_Background_InvMass_vs_Pt",massBG,MomentumVectorbackgroundCandidate.Pt());\r
-         fHistograms->FillHistogram("ESD_Background_InvMass",massBG);\r
-       }\r
-      }\r
-      delete backgroundCandidate;   \r
-      //cout << "nearly at the end of background" << endl;\r
-                       \r
-    }\r
-  }\r
-}\r
-\r
-void AliAnalysisTaskGammaConversion::Terminate(Option_t */*option*/)\r
-{\r
-  // Terminate analysis\r
-  //\r
-  AliDebug(1,"Do nothing in Terminate");\r
-}\r
-\r
-void AliAnalysisTaskGammaConversion::UserCreateOutputObjects()\r
-{\r
-  // Create the output container\r
-  if(fOutputContainer != NULL){\r
-    delete fOutputContainer;\r
-    fOutputContainer = NULL;\r
-  }\r
-  if(fOutputContainer == NULL){\r
-    fOutputContainer = new TList();\r
-  }\r
-       \r
-  //Adding the histograms to the output container\r
-  fHistograms->GetOutputContainer(fOutputContainer);\r
-       \r
-       \r
-  if(fWriteNtuple){\r
-    if(fGammaNtuple == NULL){\r
-      fGammaNtuple = new TNtuple("V0ntuple","V0ntuple","OnTheFly:HasVertex:NegPIDProb:PosPIDProb:X:Y:Z:R:MotherCandidateNDF:MotherCandidateChi2:MotherCandidateEnergy:MotherCandidateEta:MotherCandidatePt:MotherCandidateMass:MotherCandidateWidth:MCMotherCandidatePT:EPOpeningAngle:ElectronEnergy:ElectronPt:ElectronEta:ElectronPhi:PositronEnergy:PositronPt:PositronEta:PositronPhi:HasSameMCMother:MotherMCParticlePIDCode",50000);\r
-    }\r
-    if(fNeutralMesonNtuple == NULL){\r
-      fNeutralMesonNtuple = new TNtuple("NeutralMesonNtuple","NeutralMesonNtuple","test");\r
-    }\r
-    TList * ntupleTList = new TList();\r
-    ntupleTList->SetName("Ntuple");\r
-    ntupleTList->Add((TNtuple*)fGammaNtuple);\r
-    fOutputContainer->Add(ntupleTList);\r
-  }\r
-       \r
-  fOutputContainer->SetName(GetName());\r
-}\r
-\r
-Double_t AliAnalysisTaskGammaConversion::GetMCOpeningAngle(TParticle* const daughter0, TParticle* const daughter1) const{\r
-  //helper function\r
-  TVector3 v3D0(daughter0->Px(),daughter0->Py(),daughter0->Pz());\r
-  TVector3 v3D1(daughter1->Px(),daughter1->Py(),daughter1->Pz());\r
-  return v3D0.Angle(v3D1);\r
-}\r
-\r
-void AliAnalysisTaskGammaConversion::CheckV0Efficiency(){\r
-\r
-  vector<Int_t> indexOfGammaParticle;\r
-\r
-  fStack = fV0Reader->GetMCStack();\r
-\r
-  if(fV0Reader->CheckForPrimaryVertex() == kFALSE){\r
-    return; // aborts if the primary vertex does not have contributors.\r
-  }\r
-\r
-  for (Int_t iTracks = 0; iTracks < fStack->GetNprimary(); iTracks++) {\r
-    TParticle* particle = (TParticle *)fStack->Particle(iTracks);\r
-    if(particle->GetPdgCode()==22){     //Gamma\r
-      if(particle->GetNDaughters() >= 2){\r
-       TParticle* electron=NULL;\r
-       TParticle* positron=NULL; \r
-       for(Int_t daughterIndex=particle->GetFirstDaughter();daughterIndex<=particle->GetLastDaughter();daughterIndex++){\r
-         TParticle *tmpDaughter = fStack->Particle(daughterIndex);\r
-         if(tmpDaughter->GetUniqueID() == 5){\r
-           if(tmpDaughter->GetPdgCode() == 11){\r
-             electron = tmpDaughter;\r
-           }\r
-           else if(tmpDaughter->GetPdgCode() == -11){\r
-             positron = tmpDaughter;\r
-           }\r
-         }\r
-       }\r
-       if(electron!=NULL && positron!=0){\r
-         if(electron->R()<160){\r
-           indexOfGammaParticle.push_back(iTracks);\r
-         }\r
-       }\r
-      }\r
-    }\r
-  }\r
-\r
-  Int_t nFoundGammas=0;\r
-  Int_t nNotFoundGammas=0;\r
-\r
-  Int_t numberOfV0s = fV0Reader->GetNumberOfV0s();\r
-  for(Int_t i=0;i<numberOfV0s;i++){\r
-    fV0Reader->GetV0(i);\r
-    \r
-    if(fV0Reader->HasSameMCMother() == kFALSE){\r
-      continue;\r
-    }\r
-    \r
-    TParticle * negativeMC = (TParticle*)fV0Reader->GetNegativeMCParticle();\r
-    TParticle * positiveMC = (TParticle*)fV0Reader->GetPositiveMCParticle();\r
-    \r
-    if(TMath::Abs(negativeMC->GetPdgCode())!=11 || TMath::Abs(positiveMC->GetPdgCode())!=11){\r
-      continue;\r
-    }\r
-    if(negativeMC->GetPdgCode()==positiveMC->GetPdgCode()){\r
-      continue;\r
-    }\r
-    \r
-    if(fV0Reader->GetMotherMCParticle()->GetPdgCode() == 22){\r
-      //TParticle * v0Gamma = fV0Reader->GetMotherMCParticle();\r
-      for(UInt_t mcIndex=0;mcIndex<indexOfGammaParticle.size();mcIndex++){\r
-       if(negativeMC->GetFirstMother()==indexOfGammaParticle[mcIndex]){\r
-         nFoundGammas++;\r
-       }\r
-       else{\r
-         nNotFoundGammas++;\r
-       }\r
-      }\r
-    }\r
-  }\r
-  //  cout<<"Found: "<<nFoundGammas<<"  of: "<<indexOfGammaParticle.size()<<endl;\r
-}\r
-\r
-\r
-void AliAnalysisTaskGammaConversion::ProcessGammaElectronsForChicAnalysis(){\r
-\r
-\r
-  fESDEvent = fV0Reader->GetESDEvent();\r
-\r
-\r
-  vector <AliESDtrack*> ESDeNegTemp(0);\r
-  vector <AliESDtrack*> ESDePosTemp(0);\r
-  vector <AliESDtrack*> ESDxNegTemp(0);\r
-  vector <AliESDtrack*> ESDxPosTemp(0);\r
-  vector <AliESDtrack*> ESDeNegNoJPsi(0);\r
-  vector <AliESDtrack*> ESDePosNoJPsi(0); \r
-\r
-\r
-\r
-  fHistograms->FillTable("Table_Electrons",0);//Count number of Events\r
-\r
-  for(Int_t iTracks = 0; iTracks < fESDEvent->GetNumberOfTracks(); iTracks++){\r
-    AliESDtrack* curTrack = fESDEvent->GetTrack(iTracks);\r
-\r
-    if(!curTrack){\r
-      //print warning here\r
-      continue;\r
-    }\r
-\r
-    double p[3];if(!curTrack->GetConstrainedPxPyPz(p))continue;\r
-    double r[3];curTrack->GetConstrainedXYZ(r);\r
-\r
-    TVector3 rXYZ(r);\r
-\r
-    fHistograms->FillTable("Table_Electrons",4);//Count number of ESD tracks\r
-\r
-    Bool_t flagKink       =  kTRUE;\r
-    Bool_t flagTPCrefit   =  kTRUE;\r
-    Bool_t flagTRDrefit   =  kTRUE;\r
-    Bool_t flagITSrefit   =  kTRUE;\r
-    Bool_t flagTRDout     =  kTRUE;\r
-    Bool_t flagVertex     =  kTRUE;\r
-\r
-\r
-    //Cuts ---------------------------------------------------------------\r
-\r
-    if(curTrack->GetKinkIndex(0) > 0){\r
-      fHistograms->FillHistogram("Table_Electrons",5);//Count kink\r
-      flagKink = kFALSE;\r
-    }\r
-\r
-    ULong_t trkStatus = curTrack->GetStatus();\r
-\r
-    ULong_t tpcRefit = (trkStatus & AliESDtrack::kTPCrefit);\r
-\r
-    if(!tpcRefit){\r
-      fHistograms->FillHistogram("Table_Electrons",9);//Count not TPCrefit\r
-      flagTPCrefit = kFALSE;\r
-    }\r
-\r
-    ULong_t itsRefit = (trkStatus & AliESDtrack::kITSrefit);\r
-    if(!itsRefit){\r
-      fHistograms->FillHistogram("Table_Electrons",10);//Count not ITSrefit\r
-      flagITSrefit = kFALSE;\r
-    }\r
-\r
-    ULong_t trdRefit = (trkStatus & AliESDtrack::kTRDrefit);\r
-\r
-    if(!trdRefit){\r
-      fHistograms->FillHistogram("Table_Electrons",8); //Count not TRDrefit\r
-      flagTRDrefit = kFALSE;\r
-    }\r
-\r
-    ULong_t trdOut = (trkStatus & AliESDtrack::kTRDout);\r
-\r
-    if(!trdOut) {\r
-      fHistograms->FillHistogram("Table_Electrons",7); //Count not TRDout\r
-      flagTRDout = kFALSE;\r
-    }\r
-\r
-    double nsigmaToVxt = GetSigmaToVertex(curTrack);\r
-\r
-    if(nsigmaToVxt > 3){\r
-      fHistograms->FillHistogram("Table_Electrons",6); //Count Tracks with number of sigmas > 3\r
-      flagVertex = kFALSE;\r
-    }\r
-\r
-    if(! (flagKink && flagTPCrefit && flagITSrefit && flagTRDrefit && flagTRDout && flagVertex ) ) continue;\r
-    fHistograms->FillHistogram("Table_Electrons",11);//Count Tracks passed Cuts\r
-\r
-\r
-    Stat_t pid, weight;\r
-    GetPID(curTrack, pid, weight);\r
-\r
-    if(pid!=0){\r
-      fHistograms->FillHistogram("Table_Electrons",12); //Count Tracks with pid != 0\r
-    }\r
-\r
-    if(pid == 0){\r
-      fHistograms->FillHistogram("Table_Electrons",13); //Count Tracks with pid != 0\r
-    }\r
-\r
-\r
-\r
-\r
-    Int_t labelMC = TMath::Abs(curTrack->GetLabel());\r
-    TParticle* curParticle = fStack->Particle(labelMC);\r
-\r
-\r
-\r
-\r
-    TLorentzVector curElec;\r
-    curElec.SetXYZM(p[0],p[1],p[2],fElectronMass);\r
-\r
-\r
-\r
-\r
-    if(curTrack->GetSign() > 0){\r
-\r
-      ESDxPosTemp.push_back(curTrack);\r
-\r
-      if( pid == 0){\r
-\r
-       fHistograms->FillHistogram("ESD_ElectronPosNegPt",curElec.Pt());\r
-       fHistograms->FillHistogram("ESD_ElectronPosPt",curElec.Pt());\r
-       fHistograms->FillHistogram("MC_ElectronPosNegPt",curParticle->Pt());\r
-       fHistograms->FillHistogram("ESD_ElectronPosNegEta",curElec.Eta());\r
-       fHistograms->FillHistogram("MC_ElectronPosNegEta",curParticle->Eta());\r
-       ESDePosTemp.push_back(curTrack);\r
-\r
-\r
-\r
-      }\r
-\r
-    }\r
-    else {\r
-      ESDxNegTemp.push_back(curTrack);\r
-\r
-      if( pid == 0){\r
-\r
-       fHistograms->FillHistogram("ESD_ElectronPosNegPt",curElec.Pt());\r
-       fHistograms->FillHistogram("ESD_ElectronNegPt",curElec.Pt());\r
-       fHistograms->FillHistogram("MC_ElectronPosNegPt",curParticle->Pt());\r
-       fHistograms->FillHistogram("ESD_ElectronPosNegEta",curElec.Eta());\r
-       fHistograms->FillHistogram("MC_ElectronPosNegEta",curParticle->Eta());\r
-       ESDeNegTemp.push_back(curTrack);\r
-\r
-\r
-\r
-\r
-      }\r
-    }\r
-\r
-  }\r
-\r
-\r
-  Bool_t ePosJPsi = kFALSE;\r
-  Bool_t eNegJPsi = kFALSE;            \r
-  Bool_t ePosPi0  = kFALSE;\r
-  Bool_t eNegPi0  = kFALSE;\r
-       \r
-  UInt_t iePosJPsi=0,ieNegJPsi=0,iePosPi0=0,ieNegPi0=0;\r
\r
-  for(UInt_t iNeg=0; iNeg < ESDeNegTemp.size(); iNeg++){\r
-    if(fStack->Particle(TMath::Abs(ESDeNegTemp[iNeg]->GetLabel()))->GetPdgCode() == 11)\r
-      if(fStack->Particle(TMath::Abs(ESDeNegTemp[iNeg]->GetLabel()))->GetMother(0) > -1){\r
-       Int_t labelMother = fStack->Particle(TMath::Abs(ESDeNegTemp[iNeg]->GetLabel()))->GetMother(0);\r
-       TParticle* partMother = fStack ->Particle(labelMother);\r
-       if (partMother->GetPdgCode() == 111){\r
-         ieNegPi0 = iNeg;\r
-         eNegPi0 = kTRUE;\r
-       }\r
-       if(partMother->GetPdgCode() == 443){ //Mother JPsi\r
-         fHistograms->FillTable("Table_Electrons",14);\r
-         ieNegJPsi = iNeg;\r
-         eNegJPsi = kTRUE;\r
-       }\r
-       else{   \r
-         ESDeNegNoJPsi.push_back(ESDeNegTemp[iNeg]);\r
-         //            cout<<"ESD No Positivo JPsi "<<endl;\r
-       }\r
-\r
-      }\r
-  }    \r
-\r
-  for(UInt_t iPos=0; iPos < ESDePosTemp.size(); iPos++){\r
-    if(fStack->Particle(TMath::Abs(ESDePosTemp[iPos]->GetLabel()))->GetPdgCode() == -11)\r
-      if(fStack->Particle(TMath::Abs(ESDePosTemp[iPos]->GetLabel()))->GetMother(0) > -1){\r
-       Int_t labelMother = fStack->Particle(TMath::Abs(ESDePosTemp[iPos]->GetLabel()))->GetMother(0);\r
-       TParticle* partMother = fStack ->Particle(labelMother);\r
-       if (partMother->GetPdgCode() == 111){\r
-         iePosPi0 = iPos;\r
-         ePosPi0 = kTRUE;\r
-       }\r
-       if(partMother->GetPdgCode() == 443){ //Mother JPsi\r
-         fHistograms->FillTable("Table_Electrons",15);\r
-         iePosJPsi = iPos;\r
-         ePosJPsi = kTRUE;\r
-       }\r
-       else{\r
-         ESDePosNoJPsi.push_back(ESDePosTemp[iPos]);\r
-         //            cout<<"ESD No Negativo JPsi "<<endl;\r
-       }\r
-\r
-      }\r
-  }\r
-       \r
-  if( eNegJPsi && ePosJPsi ){\r
-    TVector3 tempeNegV,tempePosV;\r
-    tempeNegV.SetXYZ(ESDeNegTemp[ieNegJPsi]->Px(),ESDeNegTemp[ieNegJPsi]->Py(),ESDeNegTemp[ieNegJPsi]->Pz());                  \r
-    tempePosV.SetXYZ(ESDePosTemp[iePosJPsi]->Px(),ESDePosTemp[iePosJPsi]->Py(),ESDePosTemp[iePosJPsi]->Pz());\r
-    fHistograms->FillTable("Table_Electrons",16);\r
-    fHistograms->FillHistogram("ESD_ElectronPosNegJPsiAngle",tempeNegV.Angle(tempePosV));      \r
-    fHistograms->FillHistogram("MC_ElectronPosNegJPsiAngle",GetMCOpeningAngle(fStack->Particle(TMath::Abs(ESDeNegTemp[ieNegJPsi]->GetLabel())),\r
-                                                                             fStack->Particle(TMath::Abs(ESDePosTemp[iePosJPsi]->GetLabel()))));       \r
-  }\r
-       \r
-  if( eNegPi0 && ePosPi0 ){\r
-    TVector3 tempeNegV,tempePosV;\r
-    tempeNegV.SetXYZ(ESDeNegTemp[ieNegPi0]->Px(),ESDeNegTemp[ieNegPi0]->Py(),ESDeNegTemp[ieNegPi0]->Pz());\r
-    tempePosV.SetXYZ(ESDePosTemp[iePosPi0]->Px(),ESDePosTemp[iePosPi0]->Py(),ESDePosTemp[iePosPi0]->Pz());\r
-    fHistograms->FillHistogram("ESD_ElectronPosNegPi0Angle",tempeNegV.Angle(tempePosV));\r
-    fHistograms->FillHistogram("MC_ElectronPosNegPi0Angle",GetMCOpeningAngle(fStack->Particle(TMath::Abs(ESDeNegTemp[ieNegPi0]->GetLabel())),\r
-                                                                            fStack->Particle(TMath::Abs(ESDePosTemp[iePosPi0]->GetLabel()))));   \r
-  }\r
-        \r
-\r
-  FillAngle("ESD_eNegePosAngleBeforeCut",GetTLorentzVector(ESDeNegTemp),GetTLorentzVector(ESDePosTemp));\r
-\r
-  CleanWithAngleCuts(ESDeNegTemp,ESDePosTemp,fKFReconstructedGammas);\r
-       \r
-  vector <TLorentzVector> CurrentTLVeNeg = GetTLorentzVector(fCurrentEventNegElectron);\r
-  vector <TLorentzVector> CurrentTLVePos = GetTLorentzVector(fCurrentEventPosElectron);\r
-\r
-\r
-  FillAngle("ESD_eNegePosAngleAfterCut",CurrentTLVeNeg,CurrentTLVePos);\r
-\r
\r
-\r
-\r
-  //FillAngle("ESD_eNegePosAngleAfterCut",CurrentTLVeNeg,CurrentTLVePos);\r
-\r
-\r
-  FillElectronInvMass("ESD_InvMass_ePluseMinus",CurrentTLVeNeg,CurrentTLVePos);\r
-  FillElectronInvMass("ESD_InvMass_xPlusxMinus",GetTLorentzVector(ESDxNegTemp),GetTLorentzVector(ESDxPosTemp));\r
-\r
-       \r
-\r
-  FillGammaElectronInvMass("ESD_InvMass_GammaePluseMinusChiC","ESD_InvMass_GammaePluseMinusChiCDiff",\r
-                          fKFReconstructedGammasCut,CurrentTLVeNeg,CurrentTLVePos);\r
-\r
-  FillGammaElectronInvMass("ESD_InvMass_GammaePluseMinusPi0","ESD_InvMass_GammaePluseMinusPi0Diff",\r
-                          fKFReconstructedGammasCut,CurrentTLVeNeg,CurrentTLVePos);\r
-\r
-  //BackGround\r
-\r
-  //Like Sign e+e-\r
-  ElectronBackground("ESD_ENegBackground",CurrentTLVeNeg);\r
-  ElectronBackground("ESD_EPosBackground",CurrentTLVePos);\r
-  ElectronBackground("ESD_EPosENegBackground",CurrentTLVeNeg);\r
-  ElectronBackground("ESD_EPosENegBackground",CurrentTLVePos);\r
-\r
-  //        Like Sign e+e- no JPsi\r
-  ElectronBackground("ESD_EPosENegNoJPsiBG",GetTLorentzVector(ESDeNegNoJPsi));\r
-  ElectronBackground("ESD_EPosENegNoJPsiBG",GetTLorentzVector(ESDePosNoJPsi));\r
-\r
-  //Mixed Event\r
-\r
-  if( fCurrentEventPosElectron.size() > 0 && fCurrentEventNegElectron.size() > 0 && fKFReconstructedGammasCut.size() > 0 ){\r
-    FillGammaElectronInvMass("ESD_EPosENegGammaBackgroundMX","ESD_EPosENegGammaBackgroundMXDiff",\r
-                            fKFReconstructedGammasCut,fPreviousEventTLVNegElectron,fPreviousEventTLVPosElectron);\r
-    fPreviousEventTLVNegElectron = CurrentTLVeNeg;\r
-    fPreviousEventTLVPosElectron = CurrentTLVePos;\r
-\r
-  }\r
-\r
-  /*\r
-  //Photons P\r
-  Double_t vtx[3];\r
-  vtx[0]=0;vtx[1]=0;vtx[2]=0;\r
-  for(UInt_t i=0;i<fKFReconstructedGammasChic.size();i++){\r
-\r
-  //      if(fMCGammaChicTempCut[i]->GetMother(0) < 0) continue;\r
-\r
-\r
-\r
-  Int_t tempLabel = fStack->Particle(fMCGammaChicTempCut[i]->GetMother(0))->GetPdgCode();\r
-  //      cout<<" Label Pedro Gonzalez " <<tempLabel <<endl;\r
-\r
-  //      cout<<" Label Distance"<<fKFReconstructedGammasChic[i].GetDistanceFromVertex(vtx)<<endl;\r
-\r
-  if( tempLabel == 10441 || tempLabel == 20443 || tempLabel == 445 )\r
-\r
-  fHistograms->FillHistogram("ESD_PhotonsMomentum",fKFReconstructedGammasChic[i].GetMomentum());\r
-\r
-\r
-  }\r
-\r
-\r
-  */\r
-\r
-\r
-}\r
-\r
-void AliAnalysisTaskGammaConversion::FillAngle(TString histoName,vector <TLorentzVector> TLVeNeg, vector <TLorentzVector> TLVePos){\r
-  for( UInt_t iNeg=0; iNeg < TLVeNeg.size(); iNeg++){\r
-    for (UInt_t iPos=0; iPos < TLVePos.size(); iPos++){\r
-      fHistograms->FillHistogram(histoName.Data(),TLVeNeg[iNeg].Vect().Angle(TLVePos[iPos].Vect()));\r
-    }\r
-  }\r
-}\r
-void AliAnalysisTaskGammaConversion::FillElectronInvMass(TString histoName, vector <TLorentzVector> eNeg, vector <TLorentzVector> ePos){\r
-\r
-  for( UInt_t n=0; n < eNeg.size(); n++){\r
-\r
-    TLorentzVector en = eNeg.at(n);\r
-    for (UInt_t p=0; p < ePos.size(); p++){\r
-      TLorentzVector ep = ePos.at(p);\r
-      TLorentzVector np = ep + en;\r
-      fHistograms->FillHistogram(histoName.Data(),np.M());\r
-    }\r
-  }\r
-\r
-}\r
-\r
-void AliAnalysisTaskGammaConversion::FillGammaElectronInvMass(TString histoMass,TString histoDiff,vector <AliKFParticle> fKFGammas,\r
-                                                             vector <TLorentzVector> TLVeNeg,vector<TLorentzVector> TLVePos)\r
-{\r
-\r
-\r
-  for( UInt_t iNeg=0; iNeg < TLVeNeg.size(); iNeg++ ){\r
-\r
-    for (UInt_t iPos=0; iPos < TLVePos.size(); iPos++){\r
-\r
-      TLorentzVector xy = TLVePos[iPos] + TLVeNeg[iNeg];\r
-\r
-      for (UInt_t iGam=0; iGam < fKFGammas.size(); iGam++){\r
-\r
-       AliKFParticle * GammaCandidate = &fKFGammas[iGam];\r
-       TLorentzVector g;\r
-\r
-       g.SetXYZM(GammaCandidate->GetPx(),GammaCandidate->GetPy(),GammaCandidate->GetPz(),fGammaMass);\r
-       TLorentzVector xyg = xy + g;\r
-       fHistograms->FillHistogram(histoMass.Data(),xyg.M());\r
-       fHistograms->FillHistogram(histoDiff.Data(),(xyg.M()-xy.M()));\r
-      }\r
-    }\r
-  }\r
-\r
-}\r
-void AliAnalysisTaskGammaConversion::ElectronBackground(TString hBg, vector <TLorentzVector> e)\r
-{\r
-  for(UInt_t i=0; i < e.size(); i++)\r
-    {\r
-      for (UInt_t j=i+1; j < e.size(); j++)\r
-       {\r
-         TLorentzVector ee = e[i] + e[j];\r
-\r
-         fHistograms->FillHistogram(hBg.Data(),ee.M());\r
-       }\r
-    }\r
-}\r
-\r
-\r
-void AliAnalysisTaskGammaConversion::CleanWithAngleCuts(vector <AliESDtrack*> NegativeElectrons,\r
-                                                       vector <AliESDtrack*> PositiveElectrons, vector <AliKFParticle> Gammas){\r
-\r
-  UInt_t  N = NegativeElectrons.size();\r
-  UInt_t  P = PositiveElectrons.size();\r
-  UInt_t  G = Gammas.size();\r
-\r
-\r
-\r
-  vector <Bool_t> xNegBand(N);\r
-  vector <Bool_t> xPosBand(P);\r
-  vector <Bool_t> gammaBand(G);\r
-\r
-\r
-  for(UInt_t iNeg=0; iNeg < N; iNeg++) xNegBand[iNeg]=kTRUE;\r
-  for(UInt_t iPos=0; iPos < P; iPos++) xPosBand[iPos]=kTRUE;\r
-  for(UInt_t iGam=0; iGam < G; iGam++) gammaBand[iGam]=kTRUE;\r
-\r
-\r
-  for(UInt_t iPos=0; iPos < P; iPos++){\r
-       \r
-    Double_t P[3]; PositiveElectrons[iPos]->GetConstrainedPxPyPz(P); \r
-\r
-    TVector3 ePosV(P[0],P[1],P[2]);\r
-\r
-    for(UInt_t iNeg=0; iNeg < N; iNeg++){\r
-       \r
-      Double_t N[3]; NegativeElectrons[iNeg]->GetConstrainedPxPyPz(N); \r
-      TVector3 eNegV(N[0],N[1],N[2]);\r
-\r
-      if(ePosV.Angle(eNegV) < 0.05){ //e+e- from gamma\r
-       xPosBand[iPos]=kFALSE;\r
-       xNegBand[iNeg]=kFALSE;\r
-      }\r
-\r
-      for(UInt_t iGam=0; iGam < G; iGam++){\r
-       AliKFParticle* GammaCandidate = &Gammas[iGam];\r
-       TVector3 GammaCandidateVector(GammaCandidate->Px(),GammaCandidate->Py(),GammaCandidate->Pz());\r
-       if(ePosV.Angle(GammaCandidateVector) < 0.05 || eNegV.Angle(GammaCandidateVector) < 0.05)\r
-         gammaBand[iGam]=kFALSE;\r
-      }\r
-    }\r
-  }\r
-\r
-\r
-\r
-\r
-  for(UInt_t iPos=0; iPos < P; iPos++){\r
-    if(xPosBand[iPos]){\r
-      fCurrentEventPosElectron.push_back(PositiveElectrons[iPos]);\r
-    }\r
-  }\r
-  for(UInt_t iNeg=0;iNeg < N; iNeg++){\r
-    if(xNegBand[iNeg]){\r
-      fCurrentEventNegElectron.push_back(NegativeElectrons[iNeg]);\r
-    }\r
-  }\r
-  for(UInt_t iGam=0; iGam < G; iGam++){\r
-    if(gammaBand[iGam]){\r
-      fKFReconstructedGammasCut.push_back(Gammas[iGam]);\r
-    }\r
-  }\r
-}\r
-\r
-\r
-void  AliAnalysisTaskGammaConversion::GetPID(AliESDtrack *track, Stat_t &pid, Stat_t &weight)\r
-{\r
-  pid = -1;\r
-  weight = -1;\r
-\r
-  double wpart[5];\r
-  double wpartbayes[5];\r
-\r
-  //get probability of the diffenrent particle types\r
-  track->GetESDpid(wpart);\r
-\r
-  // Tentative particle type "concentrations"\r
-  double c[5]={0.01, 0.01, 0.85, 0.10, 0.05};\r
-\r
-  //Bayes' formula\r
-  double rcc = 0.;\r
-  for (int i = 0; i < 5; i++)\r
-    {\r
-      rcc+=(c[i] * wpart[i]);\r
-    }\r
-\r
-\r
-\r
-  for (int i=0; i<5; i++) {\r
-    if( rcc!=0){\r
-      wpartbayes[i] = c[i] * wpart[i] / rcc;\r
-    }\r
-  }\r
-\r
-\r
-\r
-  Float_t max=0.;\r
-  int ipid=-1;\r
-  //find most probable particle in ESD pid\r
-  //0:Electron - 1:Muon - 2:Pion - 3:Kaon - 4:Proton\r
-  for (int i = 0; i < 5; i++)\r
-    {\r
-      if (wpartbayes[i] > max)\r
-        {\r
-          ipid = i;\r
-          max = wpartbayes[i];\r
-        }\r
-    }\r
-\r
-  pid = ipid;\r
-  weight = max;\r
-}\r
-double AliAnalysisTaskGammaConversion::GetSigmaToVertex(AliESDtrack* t)\r
-{\r
-  // Calculates the number of sigma to the vertex.\r
-\r
-  Float_t b[2];\r
-  Float_t bRes[2];\r
-  Float_t bCov[3];\r
-  t->GetImpactParameters(b,bCov);\r
-  if (bCov[0]<=0 || bCov[2]<=0) {\r
-    AliDebug(1, "Estimated b resolution lower or equal zero!");\r
-    bCov[0]=0; bCov[2]=0;\r
-  }\r
-  bRes[0] = TMath::Sqrt(bCov[0]);\r
-  bRes[1] = TMath::Sqrt(bCov[2]);\r
-\r
-  // -----------------------------------\r
-  // How to get to a n-sigma cut?\r
-  //\r
-  // The accumulated statistics from 0 to d is\r
-  //\r
-  // ->  Erf(d/Sqrt(2)) for a 1-dim gauss (d = n_sigma)\r
-  // ->  1 - Exp(-d**2) for a 2-dim gauss (d*d = dx*dx + dy*dy != n_sigma)\r
-  //\r
-  // It means that for a 2-dim gauss: n_sigma(d) = Sqrt(2)*ErfInv(1 - Exp((-x**2)/2)\r
-  // Can this be expressed in a different way?\r
-\r
-  if (bRes[0] == 0 || bRes[1] ==0)\r
-    return -1;\r
-\r
-  double d = TMath::Sqrt(TMath::Power(b[0]/bRes[0],2) + TMath::Power(b[1]/bRes[1],2));\r
-\r
-  // stupid rounding problem screws up everything:\r
-  // if d is too big, TMath::Exp(...) gets 0, and TMath::ErfInverse(1) that should be infinite, gets 0 :(\r
-  if (TMath::Exp(-d * d / 2) < 1e-10)\r
-    return 1000;\r
-\r
-\r
-  d = TMath::ErfInverse(1 - TMath::Exp(-d * d / 2)) * TMath::Sqrt(2);\r
-  return d;\r
-}\r
-vector <TLorentzVector> AliAnalysisTaskGammaConversion::GetTLorentzVector(vector <AliESDtrack*> ESDtrack){\r
-\r
-  vector <TLorentzVector> TLVtrack(0);\r
-\r
-  for(UInt_t itrack=0; itrack < ESDtrack.size(); itrack++){\r
-    double P[3]; ESDtrack[itrack]->GetConstrainedPxPyPz(P);\r
-    TLorentzVector CurrentTrack;\r
-    CurrentTrack.SetXYZM(P[0],P[1],P[2],fElectronMass);\r
-    TLVtrack.push_back(CurrentTrack);\r
-  }\r
-\r
-  return TLVtrack;\r
-}\r
-\r
+/**************************************************************************
+ * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
+ *                                                                        *
+ * Author: Ana Marin, Kathrin Koch, Kenneth Aamodt                        *
+ * Version 1.1                                                            *
+ *                                                                        *
+ * Permission to use, copy, modify and distribute this software and its   *
+ * documentation strictly for non-commercial purposes is hereby granted   *
+ * without fee, provided that the above copyright notice appears in all   *
+ * copies and that both the copyright notice and this permission notice   *
+ * appear in the supporting documentation. The authors make no claims     *
+ * about the suitability of this software for any purpose. It is          *
+ * provided "as is" without express or implied warranty.                  *
+ **************************************************************************/
+
+////////////////////////////////////////////////
+//--------------------------------------------- 
+// Class used to do analysis on conversion pairs
+//---------------------------------------------
+////////////////////////////////////////////////
+
+// root
+#include <TChain.h>
+
+// analysis
+#include "AliAnalysisTaskGammaConversion.h"
+#include "AliStack.h"
+#include "AliLog.h"
+#include "AliESDtrackCuts.h"
+#include "TNtuple.h"
+
+class AliKFVertex;
+class AliAODHandler;
+class AliAODEvent;
+class ALiESDEvent;
+class AliMCEvent;
+class AliMCEventHandler;
+class AliESDInputHandler;
+class AliAnalysisManager;
+class Riostream;
+class TFile;
+class TInterpreter;
+class TSystem;
+class TROOT;
+
+ClassImp(AliAnalysisTaskGammaConversion)
+
+
+AliAnalysisTaskGammaConversion::AliAnalysisTaskGammaConversion():
+AliAnalysisTaskSE(),
+  fV0Reader(NULL),
+  fStack(NULL),
+  fESDEvent(NULL),     
+  fOutputContainer(NULL),
+  fHistograms(NULL),
+  fDoMCTruth(kFALSE),
+  fDoNeutralMeson(kFALSE),
+  fDoJet(kFALSE),
+  fDoChic(kFALSE),
+  fMCAllGammas(),
+  fMCPi0s(),
+  fMCEtas(),
+  fMCGammaChic(),
+  fKFReconstructedGammas(),
+  fIsTrueReconstructedGammas(),
+  fElectronv1(),
+  fElectronv2(),
+  fCurrentEventPosElectron(),
+  fPreviousEventPosElectron(),
+  fCurrentEventNegElectron(),
+  fPreviousEventNegElectron(),
+  fKFReconstructedGammasCut(),                 
+  fPreviousEventTLVNegElectron(),
+  fPreviousEventTLVPosElectron(),      
+  fElectronMass(-1),
+  fGammaMass(-1),
+  fPi0Mass(-1),
+  fEtaMass(-1),
+  fGammaWidth(-1),
+  fPi0Width(-1),
+  fEtaWidth(-1),
+  fMinOpeningAngleGhostCut(0.),
+  fEsdTrackCuts(0),
+  fCalculateBackground(kFALSE),
+  fWriteNtuple(kFALSE),
+  fGammaNtuple(NULL),
+  fNeutralMesonNtuple(NULL),
+  fTotalNumberOfAddedNtupleEntries(0),
+  fChargedParticles(),
+  fChargedParticlesId(),
+  fGammaPtHighest(0.),
+  fMinPtForGammaJet(1.),
+  fMinIsoConeSize(0.2),
+  fMinPtIsoCone(0.7),
+  fMinPtGamChargedCorr(0.5),
+  fMinPtJetCone(0.5),
+  fLeadingChargedIndex(-1),
+  fAODBranch(NULL),
+  fAODBranchName("GammaConv"),
+  fAODObjects()
+{
+  // Default constructor
+  // Common I/O in slot 0
+  DefineInput (0, TChain::Class());
+  DefineOutput(0, TTree::Class());
+       
+  // Your private output
+  DefineOutput(1, TList::Class());
+
+  // Define standard ESD track cuts for Gamma-hadron correlation 
+  SetESDtrackCuts();
+}
+
+AliAnalysisTaskGammaConversion::AliAnalysisTaskGammaConversion(const char* name):
+  AliAnalysisTaskSE(name),
+  fV0Reader(NULL),
+  fStack(NULL),
+  fESDEvent(NULL),     
+  fOutputContainer(0x0),
+  fHistograms(NULL),
+  fDoMCTruth(kFALSE),
+  fDoNeutralMeson(kFALSE),
+  fDoJet(kFALSE),
+  fDoChic(kFALSE),
+  fMCAllGammas(),
+  fMCPi0s(),
+  fMCEtas(),
+  fMCGammaChic(),
+  fKFReconstructedGammas(),
+  fIsTrueReconstructedGammas(),
+  fElectronv1(),
+  fElectronv2(),
+  fCurrentEventPosElectron(),
+  fPreviousEventPosElectron(),
+  fCurrentEventNegElectron(),
+  fPreviousEventNegElectron(),
+  fKFReconstructedGammasCut(), 
+  fPreviousEventTLVNegElectron(),
+  fPreviousEventTLVPosElectron(),
+  fElectronMass(-1),
+  fGammaMass(-1),
+  fPi0Mass(-1),
+  fEtaMass(-1),
+  fGammaWidth(-1),
+  fPi0Width(-1),
+  fEtaWidth(-1),
+  fMinOpeningAngleGhostCut(0.),
+  fEsdTrackCuts(0),
+  fCalculateBackground(kFALSE),
+  fWriteNtuple(kFALSE),
+  fGammaNtuple(NULL),
+  fNeutralMesonNtuple(NULL),
+  fTotalNumberOfAddedNtupleEntries(0),
+  fChargedParticles(),
+  fChargedParticlesId(),
+  fGammaPtHighest(0.),
+  fMinPtForGammaJet(1.),
+  fMinIsoConeSize(0.2),
+  fMinPtIsoCone(0.7),
+  fMinPtGamChargedCorr(0.5),
+  fMinPtJetCone(0.5),
+  fLeadingChargedIndex(-1),
+  fAODBranch(NULL),
+  fAODBranchName("GammaConv"),
+  fAODObjects()
+{
+  // Common I/O in slot 0
+  DefineInput (0, TChain::Class());
+  DefineOutput(0, TTree::Class());
+       
+  // Your private output
+  DefineOutput(1, TList::Class());
+
+  // Define standard ESD track cuts for Gamma-hadron correlation 
+  SetESDtrackCuts();
+}
+
+AliAnalysisTaskGammaConversion::~AliAnalysisTaskGammaConversion() 
+{
+  // Remove all pointers
+       
+  if(fOutputContainer){
+    fOutputContainer->Clear() ; 
+    delete fOutputContainer ;
+  }
+  if(fHistograms){
+    delete fHistograms;
+  }
+  if(fV0Reader){
+    delete fV0Reader;
+  }
+  if (fAODBranch) {
+    fAODBranch->Clear();
+    delete fAODBranch ;
+  }
+}
+
+
+void AliAnalysisTaskGammaConversion::Init()
+{
+  // Initialization
+  AliLog::SetGlobalLogLevel(AliLog::kError);
+}
+void AliAnalysisTaskGammaConversion::SetESDtrackCuts()
+{
+  // SetESDtrackCuts
+
+  fEsdTrackCuts = new AliESDtrackCuts("AliESDtrackCuts");
+//standard cuts from:
+//http://aliceinfo.cern.ch/alicvs/viewvc/PWG0/dNdEta/CreateCuts.C?revision=1.4&view=markup
+//fEsdTrackCuts->SetMinNClustersTPC(50);
+//fEsdTrackCuts->SetMaxChi2PerClusterTPC(3.5);
+//fEsdTrackCuts->SetMaxCovDiagonalElements(2,2,0.5,0.5,2);
+  fEsdTrackCuts->SetRequireTPCRefit(kTRUE);
+  fEsdTrackCuts->SetRequireITSRefit(kTRUE);
+  fEsdTrackCuts->SetMaxNsigmaToVertex(3);
+  fEsdTrackCuts->SetRequireSigmaToVertex(kTRUE);
+  //  fEsdTrackCuts->SetAcceptKinkDaughters(kFALSE);
+
+}
+
+void AliAnalysisTaskGammaConversion::Exec(Option_t */*option*/)
+{
+  // Execute analysis for current event
+       
+  ConnectInputData("");
+       
+  //Each event needs an empty branch
+  fAODBranch->Clear();
+
+  //clear vectors
+  fMCAllGammas.clear();
+  fMCPi0s.clear();
+  fMCEtas.clear();
+  fMCGammaChic.clear();
+       
+  fKFReconstructedGammas.clear();
+  fIsTrueReconstructedGammas.clear();
+  fElectronv1.clear();
+  fElectronv2.clear();
+  fCurrentEventPosElectron.clear();
+  fCurrentEventNegElectron.clear();    
+  fKFReconstructedGammasCut.clear(); 
+       
+
+  fChargedParticles.clear();   
+  fChargedParticlesId.clear(); 
+
+  //Clear the data in the v0Reader
+  fV0Reader->UpdateEventByEventData();
+
+  
+  // Process the MC information
+  if(fDoMCTruth){
+    ProcessMCData();
+  }
+  
+  //Process the v0 information with no cuts
+  ProcessV0sNoCut();
+  
+  // Process the v0 information
+  ProcessV0s();
+
+  //Fill Gamma AOD
+  FillAODWithConversionGammas() ; 
+  
+  //calculate background if flag is set
+  if(fCalculateBackground){
+    CalculateBackground();
+  }
+  
+
+  
+  
+  // Process reconstructed gammas
+  if(fDoNeutralMeson == kTRUE){
+      ProcessGammasForNeutralMesonAnalysis();
+  }
+  
+  CheckV0Efficiency();
+  
+  //Process reconstructed gammas electrons for Chi_c Analysis
+  if(fDoChic ==kFALSE){
+    ProcessGammaElectronsForChicAnalysis();
+  }
+  // Process reconstructed gammas for gamma Jet/hadron correlations
+  if(fDoJet == kTRUE){
+    ProcessGammasForGammaJetAnalysis();
+  }
+
+  PostData(1, fOutputContainer);
+       
+}
+
+void AliAnalysisTaskGammaConversion::ConnectInputData(Option_t */*option*/){
+  // see header file for documentation
+       
+  if(fV0Reader == NULL){
+    // Write warning here cuts and so on are default if this ever happens
+  }
+  fV0Reader->Initialize();
+}
+
+
+
+void AliAnalysisTaskGammaConversion::ProcessMCData(){
+  // see header file for documentation
+       
+  fStack = fV0Reader->GetMCStack();
+
+  if(fV0Reader->CheckForPrimaryVertex() == kFALSE){
+    return; // aborts if the primary vertex does not have contributors.
+  }
+
+  for (Int_t iTracks = 0; iTracks < fStack->GetNtrack(); iTracks++) {
+    TParticle* particle = (TParticle *)fStack->Particle(iTracks);
+               
+    if (!particle) {
+      //print warning here
+      continue;
+    }
+
+    ///////////////////////Begin Chic Analysis/////////////////////////////
+
+
+    if(particle->GetPdgCode() == 443){//Is JPsi
+
+      if(particle->GetNDaughters()==2){
+       if(TMath::Abs(fStack->Particle(particle->GetFirstDaughter())->GetPdgCode()) == 11 &&
+          TMath::Abs(fStack->Particle(particle->GetLastDaughter())->GetPdgCode()) == 11){
+         TParticle* daug0 = fStack->Particle(particle->GetFirstDaughter());
+         TParticle* daug1 = fStack->Particle(particle->GetLastDaughter());
+         if(TMath::Abs(daug0->Eta()) < 0.9 && TMath::Abs(daug1->Eta()) < 0.9)
+           fHistograms->FillTable("Table_Electrons",3);//e+ e-  from J/Psi inside acceptance
+
+         if( TMath::Abs(daug0->Eta()) < 0.9){
+           if(daug0->GetPdgCode() == -11)
+             fHistograms->FillTable("Table_Electrons",1);//e+  from J/Psi inside acceptance
+           else
+             fHistograms->FillTable("Table_Electrons",2);//e-   from J/Psi inside acceptance
+
+         }
+         if(TMath::Abs(daug1->Eta()) < 0.9){
+           if(daug1->GetPdgCode() == -11)
+             fHistograms->FillTable("Table_Electrons",1);//e+  from J/Psi inside acceptance
+           else
+             fHistograms->FillTable("Table_Electrons",2);//e-   from J/Psi inside acceptance
+         }
+       }
+      }
+    }
+    //              const int CHI_C0   = 10441;
+    //              const int CHI_C1   = 20443;
+    //              const int CHI_C2   = 445
+    if(particle->GetPdgCode() == 22){//gamma from JPsi
+      if(particle->GetMother(0) > -1){
+       if(fStack->Particle(particle->GetMother(0))->GetPdgCode() == 10441 ||
+          fStack->Particle(particle->GetMother(0))->GetPdgCode() == 20443 ||
+          fStack->Particle(particle->GetMother(0))->GetPdgCode() == 445){
+         if(TMath::Abs(particle->Eta()) < 1.2)
+           fHistograms->FillTable("Table_Electrons",17);// gamma from chic inside accptance
+       }
+      }
+    }
+    if(particle->GetPdgCode() == 10441 || particle->GetPdgCode() == 20443 || particle->GetPdgCode() == 445){
+      if( particle->GetNDaughters() == 2){
+       TParticle* daug0 = fStack->Particle(particle->GetFirstDaughter());
+       TParticle* daug1 = fStack->Particle(particle->GetLastDaughter());
+
+       if( (daug0->GetPdgCode() == 443 || daug0->GetPdgCode() == 22) && (daug1->GetPdgCode() == 443 || daug1->GetPdgCode() == 22) ){
+         if( daug0->GetPdgCode() == 443){
+           TParticle* daugE0 = fStack->Particle(daug0->GetFirstDaughter());
+           TParticle* daugE1 = fStack->Particle(daug0->GetLastDaughter());
+           if( TMath::Abs(daug1->Eta()) < 1.2 && TMath::Abs(daugE0->Eta()) < 0.9 && TMath::Abs(daugE1->Eta()) < 0.9 )
+             fHistograms->FillTable("Table_Electrons",18);
+
+         }//if
+         else if (daug1->GetPdgCode() == 443){
+           TParticle* daugE0 = fStack->Particle(daug1->GetFirstDaughter());
+           TParticle* daugE1 = fStack->Particle(daug1->GetLastDaughter());
+           if( TMath::Abs(daug0->Eta()) < 1.2 && TMath::Abs(daugE0->Eta()) < 0.9 && TMath::Abs(daugE1->Eta()) < 0.9 )
+             fHistograms->FillTable("Table_Electrons",18);
+         }//else if
+       }//gamma o Jpsi
+      }//GetNDaughters
+    }
+
+
+    /////////////////////End Chic Analysis////////////////////////////
+
+
+    if(TMath::Abs(particle->Eta())> fV0Reader->GetEtaCut() )   continue;
+                                       
+    if(particle->R()>fV0Reader->GetMaxRCut())  continue; // cuts on distance from collision point
+               
+    Double_t tmpPhi=particle->Phi();
+               
+    if(particle->Phi()> TMath::Pi()){
+      tmpPhi = particle->Phi()-(2*TMath::Pi());
+    }
+               
+    Double_t rapidity;
+    if(particle->Energy() - particle->Pz() == 0 || particle->Energy() + particle->Pz() == 0){
+      rapidity=0;
+    }
+    else{
+      rapidity = 0.5*(TMath::Log((particle->Energy()+particle->Pz()) / (particle->Energy()-particle->Pz())));
+    }  
+               
+    //process the gammas
+    if (particle->GetPdgCode() == 22){
+                       
+      if(particle->GetMother(0) >-1 && fStack->Particle(particle->GetMother(0))->GetPdgCode() == 22){
+       continue; // no photon as mothers!
+      }
+
+      if(particle->GetMother(0) >= fStack->GetNprimary()){
+       continue; // the gamma has a mother, and it is not a primary particle
+      }
+
+      fMCAllGammas.push_back(particle);
+                       
+      fHistograms->FillHistogram("MC_allGamma_Energy", particle->Energy());
+      fHistograms->FillHistogram("MC_allGamma_Pt", particle->Pt());
+      fHistograms->FillHistogram("MC_allGamma_Eta", particle->Eta());
+      fHistograms->FillHistogram("MC_allGamma_Phi", tmpPhi);
+      fHistograms->FillHistogram("MC_allGamma_Rapid", rapidity);
+                       
+                       
+      if(particle->GetMother(0) < 0){   // direct gamma
+       fHistograms->FillHistogram("MC_allDirectGamma_Energy",particle->Energy());
+       fHistograms->FillHistogram("MC_allDirectGamma_Pt", particle->Pt());
+       fHistograms->FillHistogram("MC_allDirectGamma_Eta", particle->Eta());
+       fHistograms->FillHistogram("MC_allDirectGamma_Phi", tmpPhi);
+       fHistograms->FillHistogram("MC_allDirectGamma_Rapid", rapidity);                                
+      }
+                       
+                       
+      // looking for conversion (electron + positron from pairbuilding (= 5) )
+      TParticle* ePos = NULL;
+      TParticle* eNeg = NULL;
+                       
+      if(particle->GetNDaughters() >= 2){
+       for(Int_t daughterIndex=particle->GetFirstDaughter();daughterIndex<=particle->GetLastDaughter();daughterIndex++){
+         TParticle *tmpDaughter = fStack->Particle(daughterIndex);
+         if(tmpDaughter->GetUniqueID() == 5){
+           if(tmpDaughter->GetPdgCode() == 11){
+             eNeg = tmpDaughter;
+           }
+           else if(tmpDaughter->GetPdgCode() == -11){
+             ePos = tmpDaughter;
+           }
+         }
+       }
+      }
+                       
+                       
+      if(ePos == NULL || eNeg == NULL){ // means we do not have two daughters from pair production
+       continue;
+      }
+                       
+                       
+      Double_t ePosPhi = ePos->Phi();
+      if(ePos->Phi()> TMath::Pi()) ePosPhi = ePos->Phi()-(2*TMath::Pi());
+                       
+      Double_t eNegPhi = eNeg->Phi();
+      if(eNeg->Phi()> TMath::Pi()) eNegPhi = eNeg->Phi()-(2*TMath::Pi());
+                       
+                       
+      if(ePos->Pt()<fV0Reader->GetPtCut() || eNeg->Pt()<fV0Reader->GetPtCut()){
+       continue; // no reconstruction below the Pt cut
+      }
+                                       
+      if(TMath::Abs(ePos->Eta())> fV0Reader->GetEtaCut() || TMath::Abs(eNeg->Eta())> fV0Reader->GetEtaCut()){
+       continue;
+      }        
+                               
+      if(ePos->R()>fV0Reader->GetMaxRCut()){
+       continue; // cuts on distance from collision point
+      }
+                       
+      if(TMath::Abs(ePos->Vz()) > 240){
+       continue;   // outside material
+      }
+                       
+      if((TMath::Abs(ePos->Vz()) * fV0Reader->GetLineCutZRSlope()) - fV0Reader->GetLineCutZValue()  > ePos->R()){
+       continue;               // line cut to exclude regions where we do not reconstruct
+      }                
+               
+      fHistograms->FillHistogram("MC_ConvGamma_Energy", particle->Energy());
+      fHistograms->FillHistogram("MC_ConvGamma_Pt", particle->Pt());
+      fHistograms->FillHistogram("MC_ConvGamma_Eta", particle->Eta());
+      fHistograms->FillHistogram("MC_ConvGamma_Phi", tmpPhi);
+      fHistograms->FillHistogram("MC_ConvGamma_Rapid", rapidity);
+      fHistograms->FillHistogram("MC_ConvGamma_Pt_Eta", particle->Pt(),particle->Eta());
+                       
+      fHistograms->FillHistogram("MC_E_Energy", eNeg->Energy());
+      fHistograms->FillHistogram("MC_E_Pt", eNeg->Pt());
+      fHistograms->FillHistogram("MC_E_Eta", eNeg->Eta());
+      fHistograms->FillHistogram("MC_E_Phi", eNegPhi);
+                       
+      fHistograms->FillHistogram("MC_P_Energy", ePos->Energy());
+      fHistograms->FillHistogram("MC_P_Pt", ePos->Pt());
+      fHistograms->FillHistogram("MC_P_Eta", ePos->Eta());
+      fHistograms->FillHistogram("MC_P_Phi", ePosPhi);
+                       
+                       
+                       
+      //cout << "filled histos for converted gamma, ePos, eNeg" << endl;
+                       
+      // begin Mapping 
+      Int_t rBin    = fHistograms->GetRBin(ePos->R());
+      Int_t phiBin  = fHistograms->GetPhiBin(particle->Phi());
+                       
+      TString nameMCMappingPhiR="";
+      nameMCMappingPhiR.Form("MC_Conversion_Mapping-Phi%02d-R%02d",phiBin,rBin);
+      fHistograms->FillHistogram(nameMCMappingPhiR, ePos->Vz(), particle->Eta());
+                       
+      TString nameMCMappingPhi="";
+      nameMCMappingPhi.Form("MC_Conversion_Mapping-Phi%02d",phiBin);
+      fHistograms->FillHistogram(nameMCMappingPhi, particle->Eta());
+                       
+      TString nameMCMappingR="";
+      nameMCMappingR.Form("MC_Conversion_Mapping-R%02d",rBin);
+      fHistograms->FillHistogram(nameMCMappingR, particle->Eta());
+                       
+      TString nameMCMappingPhiInR="";
+      nameMCMappingPhiInR.Form("MC_Conversion_Mapping_Phi_R-%02d",rBin);
+      fHistograms->FillHistogram(nameMCMappingPhiInR, tmpPhi);
+      //end mapping
+                       
+      fHistograms->FillHistogram("MC_Conversion_R",ePos->R());
+      fHistograms->FillHistogram("MC_Conversion_ZR",ePos->Vz(),ePos->R());
+      fHistograms->FillHistogram("MC_Conversion_XY",ePos->Vx(),ePos->Vy());
+      fHistograms->FillHistogram("MC_Conversion_OpeningAngle",GetMCOpeningAngle(ePos, eNeg));
+                       
+      //cout << "mapping is done" << endl;
+                       
+                       
+      if(particle->GetMother(0) < 0){ // no mother = direct gamma, still inside converted
+       fHistograms->FillHistogram("MC_ConvDirectGamma_Energy",particle->Energy());
+       fHistograms->FillHistogram("MC_ConvDirectGamma_Pt", particle->Pt());
+       fHistograms->FillHistogram("MC_ConvDirectGamma_Eta", particle->Eta());
+       fHistograms->FillHistogram("MC_ConvDirectGamma_Phi", tmpPhi);
+       fHistograms->FillHistogram("MC_ConvDirectGamma_Rapid", rapidity);
+                               
+      } // end direct gamma
+      else{   // mother exits 
+       if( fStack->Particle(particle->GetMother(0))->GetPdgCode()==10441 ||//chic0 
+           fStack->Particle(particle->GetMother(0))->GetPdgCode()==20443 ||//psi2S
+           fStack->Particle(particle->GetMother(0))->GetPdgCode()==445  //chic2
+           ){ 
+         fMCGammaChic.push_back(particle);
+       }
+      }  // end if mother exits
+    } // end if particle is a photon
+               
+               
+               
+    // process motherparticles (2 gammas as daughters)
+    // the motherparticle had already to pass the R and the eta cut, but no line cut.
+    // the line cut is just valid for the conversions!
+               
+    if(particle->GetNDaughters() == 2){
+                       
+      TParticle* daughter0 = (TParticle*)fStack->Particle(particle->GetFirstDaughter());
+      TParticle* daughter1 = (TParticle*)fStack->Particle(particle->GetLastDaughter());
+                       
+      if(daughter0->GetPdgCode() != 22 || daughter1->GetPdgCode() != 22) continue; //check for gamma gamma daughters
+                       
+      // Check the acceptance for both gammas
+      Bool_t GammaEtaCut = kTRUE;
+      if(TMath::Abs(daughter0->Eta()) > fV0Reader->GetEtaCut() || TMath::Abs(daughter1->Eta()) > fV0Reader->GetEtaCut()  ) GammaEtaCut = kFALSE;
+      Bool_t GammaRCut = kTRUE;
+      if(daughter0->R() > fV0Reader->GetMaxRCut() || daughter1->R() > fV0Reader->GetMaxRCut()  ) GammaRCut = kFALSE;
+                       
+                       
+                       
+      // check for conversions now -> have to pass eta, R and line cut!
+      Bool_t daughter0Electron = kFALSE;
+      Bool_t daughter0Positron = kFALSE;
+      Bool_t daughter1Electron = kFALSE;
+      Bool_t daughter1Positron = kFALSE;
+                       
+      if(daughter0->GetNDaughters() >= 2){  // first gamma
+       for(Int_t TrackIndex=daughter0->GetFirstDaughter();TrackIndex<=daughter0->GetLastDaughter();TrackIndex++){
+         TParticle *tmpDaughter = fStack->Particle(TrackIndex);
+         if(tmpDaughter->GetUniqueID() == 5){
+           if(tmpDaughter->GetPdgCode() == 11){
+             if( TMath::Abs(tmpDaughter->Eta()) <= fV0Reader->GetEtaCut() ){
+               if( ( TMath::Abs(tmpDaughter->Vz()) * fV0Reader->GetLineCutZRSlope()) - fV0Reader->GetLineCutZValue()  < tmpDaughter->R() ){
+                 if(tmpDaughter->R()< fV0Reader->GetMaxRCut()){
+                   daughter0Electron = kTRUE;
+                 }
+               }
+                                                               
+             }
+           }
+           else if(tmpDaughter->GetPdgCode() == -11){
+             if( TMath::Abs(tmpDaughter->Eta()) <= fV0Reader->GetEtaCut() ){
+               if( ( TMath::Abs(tmpDaughter->Vz()) * fV0Reader->GetLineCutZRSlope()) - fV0Reader->GetLineCutZValue()  < tmpDaughter->R() ){
+                 if(tmpDaughter->R()< fV0Reader->GetMaxRCut()){
+                   daughter0Positron = kTRUE;
+                 }
+               }
+                                                               
+             }
+                                                       
+           }
+         }
+       }
+      }
+                       
+                       
+      if(daughter1->GetNDaughters() >= 2){   // second gamma
+       for(Int_t TrackIndex=daughter1->GetFirstDaughter();TrackIndex<=daughter1->GetLastDaughter();TrackIndex++){
+         TParticle *tmpDaughter = fStack->Particle(TrackIndex);
+         if(tmpDaughter->GetUniqueID() == 5){
+           if(tmpDaughter->GetPdgCode() == 11){
+             if( TMath::Abs(tmpDaughter->Eta()) <= fV0Reader->GetEtaCut() ){
+               if( ( TMath::Abs(tmpDaughter->Vz()) * fV0Reader->GetLineCutZRSlope()) - fV0Reader->GetLineCutZValue()  < tmpDaughter->R() ){
+                 if(tmpDaughter->R()< fV0Reader->GetMaxRCut()){
+                   daughter1Electron = kTRUE;
+                 }
+               }
+                                                               
+             }
+           }
+           else if(tmpDaughter->GetPdgCode() == -11){
+             if( TMath::Abs(tmpDaughter->Eta()) <= fV0Reader->GetEtaCut() ){
+               if( ( TMath::Abs(tmpDaughter->Vz()) * fV0Reader->GetLineCutZRSlope()) - fV0Reader->GetLineCutZValue()  < tmpDaughter->R() ){
+                 if(tmpDaughter->R()< fV0Reader->GetMaxRCut()){
+                   daughter1Positron = kTRUE;
+                 }
+               }
+                                                               
+             }
+                                                       
+           }
+         }
+       }
+      }
+                       
+                                                                                               
+                       
+                       
+      if(particle->GetPdgCode()==111){     //Pi0
+       if( iTracks >= fStack->GetNprimary()){
+         fHistograms->FillHistogram("MC_Pi0_Secondaries_Eta", particle->Eta());
+         fHistograms->FillHistogram("MC_Pi0_Secondaries_Rapid", rapidity);
+         fHistograms->FillHistogram("MC_Pi0_Secondaries_Phi", tmpPhi);
+         fHistograms->FillHistogram("MC_Pi0_Secondaries_Pt", particle->Pt());
+         fHistograms->FillHistogram("MC_Pi0_Secondaries_Energy", particle->Energy());
+         fHistograms->FillHistogram("MC_Pi0_Secondaries_R", particle->R());
+         fHistograms->FillHistogram("MC_Pi0_Secondaries_ZR", particle->Vz(),particle->R());
+         fHistograms->FillHistogram("MC_Pi0_Secondaries_GammaDaughter_OpeningAngle", GetMCOpeningAngle(daughter0,daughter1));
+         fHistograms->FillHistogram("MC_Pi0_Secondaries_XY", particle->Vx(),particle->Vy());//only fill from one daughter to avoid multiple filling
+                                       
+         if(GammaEtaCut && GammaRCut){  
+           //if(TMath::Abs(daughter0->Eta()) <= fV0Reader->GetEtaCut() && TMath::Abs(daughter1->Eta()) <= fV0Reader->GetEtaCut() ){
+           fHistograms->FillHistogram("MC_Pi0_Secondaries_Pt_Eta_withinAcceptance", particle->Pt(),particle->Eta());
+           fHistograms->FillHistogram("MC_Pi0_Secondaries_Pt_Rapid_withinAcceptance", particle->Pt(),rapidity);
+           if(daughter0Electron && daughter0Positron && daughter1Electron && daughter1Positron){
+             fHistograms->FillHistogram("MC_Pi0_Secondaries_Pt_Eta_ConvGamma_withinAcceptance", particle->Pt(),particle->Eta());
+             fHistograms->FillHistogram("MC_Pi0_Secondaries_Pt_Rapid_ConvGamma_withinAcceptance", particle->Pt(),rapidity);
+           }
+         }
+       }
+       else{
+         fHistograms->FillHistogram("MC_Pi0_Eta", particle->Eta());    
+         fHistograms->FillHistogram("MC_Pi0_Rapid", rapidity);
+         fHistograms->FillHistogram("MC_Pi0_Phi", tmpPhi);
+         fHistograms->FillHistogram("MC_Pi0_Pt", particle->Pt());
+         fHistograms->FillHistogram("MC_Pi0_Energy", particle->Energy());
+         fHistograms->FillHistogram("MC_Pi0_R", particle->R());
+         fHistograms->FillHistogram("MC_Pi0_ZR", particle->Vz(),particle->R());
+         fHistograms->FillHistogram("MC_Pi0_GammaDaughter_OpeningAngle", GetMCOpeningAngle(daughter0,daughter1));
+         fHistograms->FillHistogram("MC_Pi0_XY", particle->Vx(), particle->Vy());//only fill from one daughter to avoid multiple filling
+
+         if(GammaEtaCut && GammaRCut){
+           //    if(TMath::Abs(daughter0->Eta()) <= fV0Reader->GetEtaCut() && TMath::Abs(daughter1->Eta()) <= fV0Reader->GetEtaCut() ){
+           fHistograms->FillHistogram("MC_Pi0_Pt_Eta_withinAcceptance", particle->Pt(),particle->Eta());
+           fHistograms->FillHistogram("MC_Pi0_Pt_Rapid_withinAcceptance", particle->Pt(),rapidity);
+           if(daughter0Electron && daughter0Positron && daughter1Electron && daughter1Positron){
+             fHistograms->FillHistogram("MC_Pi0_Pt_Eta_ConvGamma_withinAcceptance", particle->Pt(),particle->Eta());
+             fHistograms->FillHistogram("MC_Pi0_Pt_Rapid_ConvGamma_withinAcceptance", particle->Pt(),rapidity);
+             fHistograms->FillHistogram("MC_Pi0_ZR_ConvGamma_withinAcceptance", particle->Vz(),particle->R());
+           }
+         }
+       }
+      }
+                       
+      if(particle->GetPdgCode()==221){   //Eta
+       fHistograms->FillHistogram("MC_Eta_Eta", particle->Eta());
+       fHistograms->FillHistogram("MC_Eta_Rapid", rapidity);
+       fHistograms->FillHistogram("MC_Eta_Phi",tmpPhi);
+       fHistograms->FillHistogram("MC_Eta_Pt", particle->Pt());
+       fHistograms->FillHistogram("MC_Eta_Energy", particle->Energy());
+       fHistograms->FillHistogram("MC_Eta_R", particle->R());
+       fHistograms->FillHistogram("MC_Eta_ZR", particle->Vz(),particle->R());
+       fHistograms->FillHistogram("MC_Eta_GammaDaughter_OpeningAngle", GetMCOpeningAngle(daughter0,daughter1));
+       fHistograms->FillHistogram("MC_Eta_XY", particle->Vx(), particle->Vy());//only fill from one daughter to avoid multiple filling
+                               
+       if(GammaEtaCut && GammaRCut){  
+       //      if(TMath::Abs(daughter0->Eta()) <= fV0Reader->GetEtaCut() && TMath::Abs(daughter1->Eta()) <= fV0Reader->GetEtaCut() ){
+         fHistograms->FillHistogram("MC_Eta_Pt_Eta_withinAcceptance", particle->Pt(),particle->Eta());
+         fHistograms->FillHistogram("MC_Eta_Pt_Rapid_withinAcceptance", particle->Pt(),rapidity);
+         if(daughter0Electron && daughter0Positron && daughter1Electron && daughter1Positron){
+           fHistograms->FillHistogram("MC_Eta_Pt_Eta_ConvGamma_withinAcceptance", particle->Pt(),particle->Eta());
+           fHistograms->FillHistogram("MC_Eta_Pt_Rapid_ConvGamma_withinAcceptance", particle->Pt(),rapidity);
+           fHistograms->FillHistogram("MC_Eta_ZR_ConvGamma_withinAcceptance", particle->Vz(),particle->R());
+         }
+                                       
+       }
+                               
+      }
+                       
+      // all motherparticles with 2 gammas as daughters
+      fHistograms->FillHistogram("MC_Mother_R", particle->R());
+      fHistograms->FillHistogram("MC_Mother_ZR", particle->Vz(),particle->R());
+      fHistograms->FillHistogram("MC_Mother_XY", particle->Vx(),particle->Vy());
+      fHistograms->FillHistogram("MC_Mother_Mass", particle->GetCalcMass());
+      fHistograms->FillHistogram("MC_Mother_GammaDaughter_OpeningAngle", GetMCOpeningAngle(daughter0,daughter1));
+      fHistograms->FillHistogram("MC_Mother_Energy", particle->Energy());
+      fHistograms->FillHistogram("MC_Mother_Pt", particle->Pt());
+      fHistograms->FillHistogram("MC_Mother_Eta", particle->Eta());
+      fHistograms->FillHistogram("MC_Mother_Rapid", rapidity);
+      fHistograms->FillHistogram("MC_Mother_Phi",tmpPhi);
+      fHistograms->FillHistogram("MC_Mother_InvMass_vs_Pt",particle->GetMass(),particle->Pt());                        
+      
+      if(GammaEtaCut && GammaRCut){  
+  //      if(TMath::Abs(daughter0->Eta()) <= fV0Reader->GetEtaCut() && TMath::Abs(daughter1->Eta()) <= fV0Reader->GetEtaCut() ){
+       fHistograms->FillHistogram("MC_Mother_Pt_Eta_withinAcceptance", particle->Pt(),particle->Eta());
+       fHistograms->FillHistogram("MC_Mother_Pt_Rapid_withinAcceptance", particle->Pt(),rapidity);
+       fHistograms->FillHistogram("MC_Mother_InvMass_vs_Pt_withinAcceptance",particle->GetMass(),particle->Pt());                      
+       if(daughter0Electron && daughter0Positron && daughter1Electron && daughter1Positron){
+         fHistograms->FillHistogram("MC_Mother_Pt_Eta_ConvGamma_withinAcceptance", particle->Pt(),particle->Eta());
+         fHistograms->FillHistogram("MC_Mother_Pt_Rapid_ConvGamma_withinAcceptance", particle->Pt(),rapidity);
+         fHistograms->FillHistogram("MC_Mother_InvMass_vs_Pt_ConvGamma_withinAcceptance",particle->GetMass(),particle->Pt());                  
+
+       }
+                               
+                               
+      }  // end passed R and eta cut
+                                               
+    } // end if(particle->GetNDaughters() == 2)
+               
+  }// end for (Int_t iTracks = 0; iTracks < fStack->GetNtrack(); iTracks++)
+       
+  //cout << "right before the end of processMCdata" << endl;
+       
+} // end ProcessMCData
+
+
+
+void AliAnalysisTaskGammaConversion::FillNtuple(){
+  //Fills the ntuple with the different values
+
+  if(fGammaNtuple == NULL){
+    return;
+  }
+  Int_t numberOfV0s = fV0Reader->GetNumberOfV0s();
+  for(Int_t i=0;i<numberOfV0s;i++){
+    Float_t values[27] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
+    AliESDv0 * cV0 = fV0Reader->GetV0(i);
+    Double_t negPID=0;
+    Double_t posPID=0;
+    fV0Reader->GetPIDProbability(negPID,posPID);
+    values[0]=cV0->GetOnFlyStatus();
+    values[1]=fV0Reader->CheckForPrimaryVertex();
+    values[2]=negPID;
+    values[3]=posPID;
+    values[4]=fV0Reader->GetX();
+    values[5]=fV0Reader->GetY();
+    values[6]=fV0Reader->GetZ();
+    values[7]=fV0Reader->GetXYRadius();
+    values[8]=fV0Reader->GetMotherCandidateNDF();
+    values[9]=fV0Reader->GetMotherCandidateChi2();
+    values[10]=fV0Reader->GetMotherCandidateEnergy();
+    values[11]=fV0Reader->GetMotherCandidateEta();
+    values[12]=fV0Reader->GetMotherCandidatePt();
+    values[13]=fV0Reader->GetMotherCandidateMass();
+    values[14]=fV0Reader->GetMotherCandidateWidth();
+    //    values[15]=fV0Reader->GetMotherMCParticle()->Pt();   MOVED TO THE END, HAS TO BE CALLED AFTER HasSameMother NB: still has the same entry in the array
+    values[16]=fV0Reader->GetOpeningAngle();
+    values[17]=fV0Reader->GetNegativeTrackEnergy();
+    values[18]=fV0Reader->GetNegativeTrackPt();
+    values[19]=fV0Reader->GetNegativeTrackEta();
+    values[20]=fV0Reader->GetNegativeTrackPhi();
+    values[21]=fV0Reader->GetPositiveTrackEnergy();
+    values[22]=fV0Reader->GetPositiveTrackPt();
+    values[23]=fV0Reader->GetPositiveTrackEta();
+    values[24]=fV0Reader->GetPositiveTrackPhi();
+    values[25]=fV0Reader->HasSameMCMother();
+    if(values[25] != 0){
+      values[26]=fV0Reader->GetMotherMCParticlePDGCode();
+      values[15]=fV0Reader->GetMotherMCParticle()->Pt();
+    }
+    fTotalNumberOfAddedNtupleEntries++;
+    fGammaNtuple->Fill(values);
+  }
+  fV0Reader->ResetV0IndexNumber();
+       
+}
+
+void AliAnalysisTaskGammaConversion::ProcessV0sNoCut(){
+  // Process all the V0's without applying any cuts to it
+
+  Int_t numberOfV0s = fV0Reader->GetNumberOfV0s();
+  for(Int_t i=0;i<numberOfV0s;i++){
+    /*AliESDv0 * cV0 = */fV0Reader->GetV0(i);
+
+    if(fV0Reader->CheckForPrimaryVertex() == kFALSE){
+      return;
+    }
+    
+    if(fDoMCTruth){
+      
+      if(fV0Reader->HasSameMCMother() == kFALSE){
+       continue;
+      }
+               
+      TParticle * negativeMC = (TParticle*)fV0Reader->GetNegativeMCParticle();
+      TParticle * positiveMC = (TParticle*)fV0Reader->GetPositiveMCParticle();
+
+      if(TMath::Abs(negativeMC->GetPdgCode())!=11 || TMath::Abs(positiveMC->GetPdgCode())!=11){
+       continue;
+      }
+      if(negativeMC->GetPdgCode()==positiveMC->GetPdgCode()){
+       continue;
+      }
+       
+      if(fV0Reader->GetMotherMCParticle()->GetPdgCode() == 22){
+      
+       fHistograms->FillHistogram("ESD_NoCutConvGamma_Pt", fV0Reader->GetMotherCandidatePt());
+       fHistograms->FillHistogram("ESD_NoCutConvGamma_Energy", fV0Reader->GetMotherCandidateEnergy());
+       fHistograms->FillHistogram("ESD_NoCutConvGamma_Eta", fV0Reader->GetMotherCandidateEta());                               
+       fHistograms->FillHistogram("ESD_NoCutConvGamma_Phi", fV0Reader->GetMotherCandidatePhi());
+       fHistograms->FillHistogram("ESD_NoCutConvGamma_Mass", fV0Reader->GetMotherCandidateMass());
+       fHistograms->FillHistogram("ESD_NoCutConvGamma_Width", fV0Reader->GetMotherCandidateWidth());
+       fHistograms->FillHistogram("ESD_NoCutConvGamma_Chi2", fV0Reader->GetMotherCandidateChi2());
+       fHistograms->FillHistogram("ESD_NoCutConvGamma_NDF", fV0Reader->GetMotherCandidateNDF());
+       fHistograms->FillHistogram("ESD_NoCutConvGamma_Rapid", fV0Reader->GetMotherCandidateRapidity());
+       fHistograms->FillHistogram("ESD_NoCutConvGamma_Pt_Eta", fV0Reader->GetMotherCandidatePt(),fV0Reader->GetMotherCandidateEta());
+
+       fHistograms->FillHistogram("ESD_NoCutConvGamma_Pt_Chi2", fV0Reader->GetMotherCandidatePt(), fV0Reader->GetMotherCandidateChi2());
+       fHistograms->FillHistogram("ESD_NoCutConvGamma_Eta_Chi2", fV0Reader->GetMotherCandidateEta(), fV0Reader->GetMotherCandidateChi2());
+                               
+       fHistograms->FillHistogram("ESD_NoCutConversion_XY", fV0Reader->GetX(),fV0Reader->GetY());
+       fHistograms->FillHistogram("ESD_NoCutConversion_R", fV0Reader->GetXYRadius());
+       fHistograms->FillHistogram("ESD_NoCutConversion_ZR", fV0Reader->GetZ(),fV0Reader->GetXYRadius());
+       fHistograms->FillHistogram("ESD_NoCutConversion_OpeningAngle", fV0Reader->GetOpeningAngle());
+                               
+       //store MCTruth properties
+       fHistograms->FillHistogram("ESD_NoCutConvGamma_MC_Pt_Eta", fV0Reader->GetMotherMCParticle()->Pt(),fV0Reader->GetMotherMCParticle()->Eta());
+       fHistograms->FillHistogram("ESD_NoCutConversion_MC_ZR", negativeMC->Vz(),negativeMC->R());
+       fHistograms->FillHistogram("ESD_NoCutConversion_MC_XY", negativeMC->Vx(),negativeMC->Vy());
+
+
+      }
+    }
+  }
+  fV0Reader->ResetV0IndexNumber();
+}
+
+void AliAnalysisTaskGammaConversion::ProcessV0s(){
+  // see header file for documentation
+       
+  if(fWriteNtuple == kTRUE){
+    FillNtuple();
+  }
+       
+  Int_t nSurvivingV0s=0;
+  while(fV0Reader->NextV0()){
+    nSurvivingV0s++;
+               
+               
+    //-------------------------- filling v0 information -------------------------------------
+    fHistograms->FillHistogram("ESD_Conversion_R", fV0Reader->GetXYRadius());
+    fHistograms->FillHistogram("ESD_Conversion_ZR", fV0Reader->GetZ(),fV0Reader->GetXYRadius());
+    fHistograms->FillHistogram("ESD_Conversion_XY", fV0Reader->GetX(),fV0Reader->GetY());
+    fHistograms->FillHistogram("ESD_Conversion_OpeningAngle", fV0Reader->GetOpeningAngle());    
+               
+    fHistograms->FillHistogram("ESD_E_Energy", fV0Reader->GetNegativeTrackEnergy());
+    fHistograms->FillHistogram("ESD_E_Pt", fV0Reader->GetNegativeTrackPt());
+    fHistograms->FillHistogram("ESD_E_Eta", fV0Reader->GetNegativeTrackEta());
+    fHistograms->FillHistogram("ESD_E_Phi", fV0Reader->GetNegativeTrackPhi());
+               
+    fHistograms->FillHistogram("ESD_P_Energy", fV0Reader->GetPositiveTrackEnergy());
+    fHistograms->FillHistogram("ESD_P_Pt", fV0Reader->GetPositiveTrackPt());
+    fHistograms->FillHistogram("ESD_P_Eta", fV0Reader->GetPositiveTrackEta());
+    fHistograms->FillHistogram("ESD_P_Phi", fV0Reader->GetPositiveTrackPhi());
+               
+    fHistograms->FillHistogram("ESD_ConvGamma_Energy", fV0Reader->GetMotherCandidateEnergy());
+    fHistograms->FillHistogram("ESD_ConvGamma_Pt", fV0Reader->GetMotherCandidatePt());
+    fHistograms->FillHistogram("ESD_ConvGamma_Eta", fV0Reader->GetMotherCandidateEta());
+    fHistograms->FillHistogram("ESD_ConvGamma_Phi", fV0Reader->GetMotherCandidatePhi());
+    fHistograms->FillHistogram("ESD_ConvGamma_Mass", fV0Reader->GetMotherCandidateMass());
+    fHistograms->FillHistogram("ESD_ConvGamma_Width", fV0Reader->GetMotherCandidateWidth());
+    fHistograms->FillHistogram("ESD_ConvGamma_Chi2", fV0Reader->GetMotherCandidateChi2());
+    fHistograms->FillHistogram("ESD_ConvGamma_NDF", fV0Reader->GetMotherCandidateNDF());
+    fHistograms->FillHistogram("ESD_ConvGamma_Rapid", fV0Reader->GetMotherCandidateRapidity());
+    fHistograms->FillHistogram("ESD_ConvGamma_Pt_Eta", fV0Reader->GetMotherCandidatePt(),fV0Reader->GetMotherCandidateEta());
+               
+    fHistograms->FillHistogram("ESD_ConvGamma_Pt_Chi2", fV0Reader->GetMotherCandidatePt(), fV0Reader->GetMotherCandidateChi2());
+    fHistograms->FillHistogram("ESD_ConvGamma_Eta_Chi2", fV0Reader->GetMotherCandidateEta(), fV0Reader->GetMotherCandidateChi2());
+               
+               
+               
+    // begin mapping
+    Int_t rBin    = fHistograms->GetRBin(fV0Reader->GetXYRadius());
+    Int_t phiBin  = fHistograms->GetPhiBin(fV0Reader->GetNegativeTrackPhi());
+    Double_t motherCandidateEta= fV0Reader->GetMotherCandidateEta();
+               
+    TString nameESDMappingPhiR="";
+    nameESDMappingPhiR.Form("ESD_Conversion_Mapping-Phi%02d-R%02d",phiBin,rBin);
+    fHistograms->FillHistogram(nameESDMappingPhiR, fV0Reader->GetZ(), motherCandidateEta);
+               
+    TString nameESDMappingPhi="";
+    nameESDMappingPhi.Form("ESD_Conversion_Mapping-Phi%02d",phiBin);
+    fHistograms->FillHistogram(nameESDMappingPhi, fV0Reader->GetZ(), motherCandidateEta);
+               
+    TString nameESDMappingR="";
+    nameESDMappingR.Form("ESD_Conversion_Mapping-R%02d",rBin);
+    fHistograms->FillHistogram(nameESDMappingR, fV0Reader->GetZ(), motherCandidateEta);  
+               
+    TString nameESDMappingPhiInR="";
+    nameESDMappingPhiInR.Form("ESD_Conversion_Mapping_Phi_R-%02d",rBin);
+    fHistograms->FillHistogram(nameESDMappingPhiInR, fV0Reader->GetMotherCandidatePhi());
+    // end mapping
+               
+    fKFReconstructedGammas.push_back(*fV0Reader->GetMotherCandidateKFCombination());
+    fElectronv1.push_back(fV0Reader->GetCurrentV0()->GetPindex());
+    fElectronv2.push_back(fV0Reader->GetCurrentV0()->GetNindex());
+
+               
+    //----------------------------------- checking for "real" conversions (MC match) --------------------------------------
+    if(fDoMCTruth){
+                       
+      if(fV0Reader->HasSameMCMother() == kFALSE){
+       fIsTrueReconstructedGammas.push_back(kFALSE);
+       continue;
+      }
+      
+               
+      TParticle * negativeMC = (TParticle*)fV0Reader->GetNegativeMCParticle();
+      TParticle * positiveMC = (TParticle*)fV0Reader->GetPositiveMCParticle();
+
+      if(TMath::Abs(negativeMC->GetPdgCode())!=11 || TMath::Abs(positiveMC->GetPdgCode())!=11){
+       fIsTrueReconstructedGammas.push_back(kFALSE);
+       continue;
+      }
+      if(negativeMC->GetPdgCode()==positiveMC->GetPdgCode()){
+       fIsTrueReconstructedGammas.push_back(kFALSE);
+       continue;
+      }
+       
+      if(fV0Reader->GetMotherMCParticle()->GetPdgCode() == 22){
+       fIsTrueReconstructedGammas.push_back(kTRUE);
+                               
+       fHistograms->FillHistogram("ESD_TrueConvGamma_Pt", fV0Reader->GetMotherCandidatePt());
+       fHistograms->FillHistogram("ESD_TrueConvGamma_Energy", fV0Reader->GetMotherCandidateEnergy());
+       fHistograms->FillHistogram("ESD_TrueConvGamma_Eta", fV0Reader->GetMotherCandidateEta());                                
+       fHistograms->FillHistogram("ESD_TrueConvGamma_Phi", fV0Reader->GetMotherCandidatePhi());
+       fHistograms->FillHistogram("ESD_TrueConvGamma_Mass", fV0Reader->GetMotherCandidateMass());
+       fHistograms->FillHistogram("ESD_TrueConvGamma_Width", fV0Reader->GetMotherCandidateWidth());
+       fHistograms->FillHistogram("ESD_TrueConvGamma_Chi2", fV0Reader->GetMotherCandidateChi2());
+       fHistograms->FillHistogram("ESD_TrueConvGamma_NDF", fV0Reader->GetMotherCandidateNDF());
+       fHistograms->FillHistogram("ESD_TrueConvGamma_Pt_Eta", fV0Reader->GetMotherCandidatePt(),fV0Reader->GetMotherCandidateEta());
+       fHistograms->FillHistogram("ESD_TrueConvGamma_Rapid", fV0Reader->GetMotherCandidateRapidity());
+       fHistograms->FillHistogram("ESD_TrueConvGamma_TrackLength", /*fV0Reader->GetNegativeTrackLength()*/fV0Reader->GetNegativeNTPCClusters());
+       fHistograms->FillHistogram("ESD_TrueConvGamma_TrackLength", /*fV0Reader->GetPositiveTrackLength()*/fV0Reader->GetPositiveNTPCClusters());
+       fHistograms->FillHistogram("ESD_TrueConvGamma_TrackLengthVSInvMass",/*fV0Reader->GetNegativeTrackLength()*/fV0Reader->GetNegativeNTPCClusters(),fV0Reader->GetMotherCandidateMass());
+       fHistograms->FillHistogram("ESD_TrueConvGamma_TrackLengthVSInvMass",/*fV0Reader->GetPositiveTrackLength()*/fV0Reader->GetPositiveNTPCClusters(),fV0Reader->GetMotherCandidateMass());
+
+       fHistograms->FillHistogram("ESD_TrueConvGamma_Pt_Chi2", fV0Reader->GetMotherCandidatePt(), fV0Reader->GetMotherCandidateChi2());
+       fHistograms->FillHistogram("ESD_TrueConvGamma_Eta_Chi2", fV0Reader->GetMotherCandidateEta(), fV0Reader->GetMotherCandidateChi2());
+
+                               
+       fHistograms->FillHistogram("ESD_TrueConversion_XY", fV0Reader->GetX(),fV0Reader->GetY());
+       fHistograms->FillHistogram("ESD_TrueConversion_R", fV0Reader->GetXYRadius());
+       fHistograms->FillHistogram("ESD_TrueConversion_ZR", fV0Reader->GetZ(),fV0Reader->GetXYRadius());
+       fHistograms->FillHistogram("ESD_TrueConversion_OpeningAngle", fV0Reader->GetOpeningAngle());
+
+       //store MCTruth properties
+       fHistograms->FillHistogram("ESD_TrueConvGamma_MC_Pt_Eta", fV0Reader->GetMotherMCParticle()->Pt(),fV0Reader->GetMotherMCParticle()->Eta());
+       fHistograms->FillHistogram("ESD_TrueConversion_MC_ZR", negativeMC->Vz(),negativeMC->R());
+       fHistograms->FillHistogram("ESD_TrueConversion_MC_XY", negativeMC->Vx(),negativeMC->Vy());
+
+       //resolution
+       Double_t mcpt   = fV0Reader->GetMotherMCParticle()->Pt();
+       Double_t esdpt  = fV0Reader->GetMotherCandidatePt();
+       Double_t resdPt = 0;
+       if(mcpt != 0){
+         resdPt = ((esdpt - mcpt)/mcpt)*100;
+       }
+                               
+       fHistograms->FillHistogram("Resolution_dPt", mcpt, resdPt);
+       fHistograms->FillHistogram("Resolution_MC_Pt", mcpt);
+       fHistograms->FillHistogram("Resolution_ESD_Pt", esdpt);
+                               
+       Double_t resdZ = 0;
+       if(fV0Reader->GetNegativeMCParticle()->Vz() != 0){
+         resdZ = ((fV0Reader->GetZ() -fV0Reader->GetNegativeMCParticle()->Vz())/fV0Reader->GetNegativeMCParticle()->Vz())*100;
+       }
+                               
+       fHistograms->FillHistogram("Resolution_dZ", fV0Reader->GetNegativeMCParticle()->Vz(), resdZ);
+       fHistograms->FillHistogram("Resolution_MC_Z", fV0Reader->GetNegativeMCParticle()->Vz());
+       fHistograms->FillHistogram("Resolution_ESD_Z", fV0Reader->GetZ());
+                               
+       Double_t resdR = 0;
+       if(fV0Reader->GetNegativeMCParticle()->R() != 0){
+         resdR = ((fV0Reader->GetXYRadius() - fV0Reader->GetNegativeMCParticle()->R())/fV0Reader->GetNegativeMCParticle()->R())*100;
+       }
+
+       fHistograms->FillHistogram("Resolution_dR", fV0Reader->GetNegativeMCParticle()->R(), resdR);
+       fHistograms->FillHistogram("Resolution_MC_R", fV0Reader->GetNegativeMCParticle()->R());
+       fHistograms->FillHistogram("Resolution_ESD_R", fV0Reader->GetXYRadius());
+       fHistograms->FillHistogram("Resolution_dR_dPt", resdR, resdPt);
+      }//if(fV0Reader->GetMotherMCParticle()->GetPdgCode() == 22)
+      else{
+       fIsTrueReconstructedGammas.push_back(kFALSE);
+      }
+    }//if(fDoMCTruth)
+  }//while(fV0Reader->NextV0)
+  fHistograms->FillHistogram("ESD_NumberOfSurvivingV0s", nSurvivingV0s);
+  fHistograms->FillHistogram("ESD_NumberOfV0s", fV0Reader->GetNumberOfV0s());
+       
+  //cout << "nearly at the end of doMCTruth" << endl;
+       
+}
+
+void AliAnalysisTaskGammaConversion::FillAODWithConversionGammas(){
+  // Fill AOD with reconstructed Gamma
+  
+  for(UInt_t gammaIndex=0;gammaIndex<fKFReconstructedGammas.size();gammaIndex++){
+    //Create AOD particle object from AliKFParticle
+
+    /*    AliKFParticle * gammakf = &fKFReconstructedGammas[gammaIndex];
+    //You could add directly AliKFParticle objects to the AOD, avoiding dependences with PartCorr
+    //but this means that I have to work a little bit more in my side.
+    //AODPWG4Particle objects are simpler and lighter, I think
+    AliAODPWG4Particle gamma = AliAODPWG4Particle(gammakf->Px(),gammakf->Py(),gammakf->Pz(), gammakf->E());
+    gamma.SetLabel(-1);//How to get the MC label of the reconstructed gamma?
+       gamma.SetCaloLabel(-1,-1); //How to get the MC label of the 2 electrons that form the gamma?
+       gamma.SetDetector("CTS"); //tag the gamma as reconstructed in the central barrel
+       gamma.SetPdg(AliCaloPID::kPhotonConv); //photon id
+       gamma.SetTag(-1); //Here I usually put a flag saying that montecarlo says it is prompt, decay fragmentation photon, or hadrons or whatever
+       
+       //Add it to the aod list
+       Int_t i = fAODBranch->GetEntriesFast();
+       new((*fAODBranch)[i])  AliAODPWG4Particle(gamma);
+    */
+    AliKFParticle * gammakf = &fKFReconstructedGammas[gammaIndex];
+    AliGammaConversionAODObject aodObject;
+    aodObject.SetPx(gammakf->GetPx());
+    aodObject.SetPy(gammakf->GetPy());
+    aodObject.SetPz(gammakf->GetPz());
+    aodObject.SetLabel1(fElectronv1[gammaIndex]);
+    aodObject.SetLabel2(fElectronv2[gammaIndex]);
+    Int_t i = fAODBranch->GetEntriesFast();
+    new((*fAODBranch)[i])  AliGammaConversionAODObject();
+   }
+
+}
+
+
+void AliAnalysisTaskGammaConversion::ProcessGammasForNeutralMesonAnalysis(){
+  // see header file for documentation
+       
+  for(UInt_t firstGammaIndex=0;firstGammaIndex<fKFReconstructedGammas.size();firstGammaIndex++){
+    for(UInt_t secondGammaIndex=firstGammaIndex+1;secondGammaIndex<fKFReconstructedGammas.size();secondGammaIndex++){
+                       
+      AliKFParticle * twoGammaDecayCandidateDaughter0 = &fKFReconstructedGammas[firstGammaIndex];
+      AliKFParticle * twoGammaDecayCandidateDaughter1 = &fKFReconstructedGammas[secondGammaIndex];
+      
+      if(fElectronv1[firstGammaIndex]==fElectronv1[secondGammaIndex] || fElectronv1[firstGammaIndex]==fElectronv2[secondGammaIndex]){
+       continue;
+      }
+      if(fElectronv2[firstGammaIndex]==fElectronv1[secondGammaIndex] || fElectronv2[firstGammaIndex]==fElectronv2[secondGammaIndex]){
+       continue;
+      }
+
+      /*
+       if(fIsTrueReconstructedGammas[firstGammaIndex] == kFALSE || fIsTrueReconstructedGammas[secondGammaIndex] == kFALSE){
+       continue;
+       }
+      */
+
+      AliKFParticle *twoGammaCandidate = new AliKFParticle(*twoGammaDecayCandidateDaughter0,*twoGammaDecayCandidateDaughter1);
+                       
+      Double_t massTwoGammaCandidate = 0.;
+      Double_t widthTwoGammaCandidate = 0.;
+      Double_t chi2TwoGammaCandidate =10000.;  
+      twoGammaCandidate->GetMass(massTwoGammaCandidate,widthTwoGammaCandidate);
+      if(twoGammaCandidate->GetNDF()>0){
+       chi2TwoGammaCandidate = twoGammaCandidate->GetChi2()/twoGammaCandidate->GetNDF();
+                               
+       if(chi2TwoGammaCandidate>0 && chi2TwoGammaCandidate<fV0Reader->GetChi2CutMeson()){                                      
+                                       
+         TVector3 momentumVectorTwoGammaCandidate(twoGammaCandidate->GetPx(),twoGammaCandidate->GetPy(),twoGammaCandidate->GetPz());
+         TVector3 spaceVectorTwoGammaCandidate(twoGammaCandidate->GetX(),twoGammaCandidate->GetY(),twoGammaCandidate->GetZ());
+                                       
+         Double_t openingAngleTwoGammaCandidate = twoGammaDecayCandidateDaughter0->GetAngle(*twoGammaDecayCandidateDaughter1);                                 
+         Double_t rapidity;
+         if(twoGammaCandidate->GetE() - twoGammaCandidate->GetPz() == 0 || twoGammaCandidate->GetE() + twoGammaCandidate->GetPz() == 0){
+           rapidity=0;
+         }
+         else{
+           rapidity = 0.5*(TMath::Log((twoGammaCandidate->GetE() +twoGammaCandidate->GetPz()) / (twoGammaCandidate->GetE()-twoGammaCandidate->GetPz())));
+         }
+                                       
+         if(openingAngleTwoGammaCandidate < fMinOpeningAngleGhostCut) continue;   // minimum opening angle to avoid using ghosttracks
+
+         fHistograms->FillHistogram("ESD_Mother_GammaDaughter_OpeningAngle", openingAngleTwoGammaCandidate);
+         fHistograms->FillHistogram("ESD_Mother_Energy", twoGammaCandidate->GetE());
+         fHistograms->FillHistogram("ESD_Mother_Pt", momentumVectorTwoGammaCandidate.Pt());
+         fHistograms->FillHistogram("ESD_Mother_Eta", momentumVectorTwoGammaCandidate.Eta());
+         fHistograms->FillHistogram("ESD_Mother_Rapid", rapidity);                                     
+         fHistograms->FillHistogram("ESD_Mother_Phi", spaceVectorTwoGammaCandidate.Phi());
+         fHistograms->FillHistogram("ESD_Mother_Mass", massTwoGammaCandidate);
+         fHistograms->FillHistogram("ESD_Mother_R", spaceVectorTwoGammaCandidate.Pt());    // Pt in Space == R!!!
+         fHistograms->FillHistogram("ESD_Mother_ZR", twoGammaCandidate->GetZ(), spaceVectorTwoGammaCandidate.Pt());
+         fHistograms->FillHistogram("ESD_Mother_XY", twoGammaCandidate->GetX(), twoGammaCandidate->GetY());
+         fHistograms->FillHistogram("ESD_Mother_InvMass_vs_Pt",massTwoGammaCandidate ,momentumVectorTwoGammaCandidate.Pt());
+         fHistograms->FillHistogram("ESD_Mother_InvMass",massTwoGammaCandidate);
+       }
+      }
+      delete twoGammaCandidate;
+                       
+      //cout << "nearly at the end of processgamma for neutral meson ..." << endl;
+                       
+                       
+    }
+  }
+}
+
+void AliAnalysisTaskGammaConversion::CalculateBackground(){
+  // see header file for documentation
+       
+  vector<AliKFParticle> vectorCurrentEventGoodV0s = fV0Reader->GetCurrentEventGoodV0s();
+  vector<AliKFParticle> vectorPreviousEventGoodV0s = fV0Reader->GetPreviousEventGoodV0s();
+  for(UInt_t iCurrent=0;iCurrent<vectorCurrentEventGoodV0s.size();iCurrent++){
+    AliKFParticle * currentEventGoodV0 = &vectorCurrentEventGoodV0s.at(iCurrent);
+    for(UInt_t iPrevious=0;iPrevious<vectorPreviousEventGoodV0s.size();iPrevious++){
+      AliKFParticle * previousGoodV0 = &vectorPreviousEventGoodV0s.at(iPrevious);
+
+      AliKFParticle *backgroundCandidate = new AliKFParticle(*currentEventGoodV0,*previousGoodV0);
+                       
+      Double_t massBG =0.;
+      Double_t widthBG = 0.;
+      Double_t chi2BG =10000.; 
+      backgroundCandidate->GetMass(massBG,widthBG);
+      if(backgroundCandidate->GetNDF()>0){
+       chi2BG = backgroundCandidate->GetChi2()/backgroundCandidate->GetNDF();
+       if(chi2BG>0 && chi2BG<fV0Reader->GetChi2CutMeson()){
+                                       
+         TVector3 MomentumVectorbackgroundCandidate(backgroundCandidate->GetPx(),backgroundCandidate->GetPy(),backgroundCandidate->GetPz());
+         TVector3 SpaceVectorbackgroundCandidate(backgroundCandidate->GetX(),backgroundCandidate->GetY(),backgroundCandidate->GetZ());
+                                       
+         Double_t openingAngleBG = currentEventGoodV0->GetAngle(*previousGoodV0);
+
+         Double_t rapidity;
+         if(backgroundCandidate->GetE() - backgroundCandidate->GetPz() == 0 || backgroundCandidate->GetE() + backgroundCandidate->GetPz() == 0) rapidity=0;
+         else rapidity = 0.5*(TMath::Log((backgroundCandidate->GetE() +backgroundCandidate->GetPz()) / (backgroundCandidate->GetE()-backgroundCandidate->GetPz())));
+
+                                       
+                                       
+                                       
+         if(openingAngleBG < fMinOpeningAngleGhostCut ) continue;   // minimum opening angle to avoid using ghosttracks
+                       
+                                       
+         fHistograms->FillHistogram("ESD_Background_GammaDaughter_OpeningAngle", openingAngleBG);
+         fHistograms->FillHistogram("ESD_Background_Energy", backgroundCandidate->GetE());
+         fHistograms->FillHistogram("ESD_Background_Pt",  MomentumVectorbackgroundCandidate.Pt());
+         fHistograms->FillHistogram("ESD_Background_Eta", MomentumVectorbackgroundCandidate.Eta());
+         fHistograms->FillHistogram("ESD_Background_Rapidity", rapidity);
+         fHistograms->FillHistogram("ESD_Background_Phi", SpaceVectorbackgroundCandidate.Phi());
+         fHistograms->FillHistogram("ESD_Background_Mass", massBG);
+         fHistograms->FillHistogram("ESD_Background_R", SpaceVectorbackgroundCandidate.Pt());  // Pt in Space == R!!!!
+         fHistograms->FillHistogram("ESD_Background_ZR", backgroundCandidate->GetZ(), SpaceVectorbackgroundCandidate.Pt());
+         fHistograms->FillHistogram("ESD_Background_XY", backgroundCandidate->GetX(), backgroundCandidate->GetY());
+         fHistograms->FillHistogram("ESD_Background_InvMass_vs_Pt",massBG,MomentumVectorbackgroundCandidate.Pt());
+         fHistograms->FillHistogram("ESD_Background_InvMass",massBG);
+       }
+      }
+      delete backgroundCandidate;   
+      //cout << "nearly at the end of background" << endl;
+                       
+    }
+  }
+}
+
+
+
+void AliAnalysisTaskGammaConversion::ProcessGammasForGammaJetAnalysis(){
+  //ProcessGammasForGammaJetAnalysis
+  Double_t distIsoMin;
+
+  CreateListOfChargedParticles();
+
+
+  for(UInt_t gammaIndex=0;gammaIndex<fKFReconstructedGammas.size();gammaIndex++){
+    AliKFParticle * currentGamma = &fKFReconstructedGammas[gammaIndex];
+    TVector3 MomentumVectorCurrentGamma(currentGamma->GetPx(),currentGamma->GetPy(),currentGamma->GetPz());
+
+    if( MomentumVectorCurrentGamma.Pt()> fMinPtForGammaJet){
+      distIsoMin=GetMinimumDistanceToCharge(gammaIndex);
+
+      if (distIsoMin > fMinIsoConeSize && fLeadingChargedIndex>=0){
+       CalculateJetCone(gammaIndex,fLeadingChargedIndex);
+      }
+    }
+  }
+}
+
+void AliAnalysisTaskGammaConversion::CreateListOfChargedParticles(){
+  // CreateListOfChargedParticles
+
+  fESDEvent = fV0Reader->GetESDEvent();
+  for(Int_t iTracks = 0; iTracks < fESDEvent->GetNumberOfTracks(); iTracks++){
+    AliESDtrack* curTrack = fESDEvent->GetTrack(iTracks);
+
+    if(!curTrack){
+      continue;
+    }
+
+    if(fEsdTrackCuts->AcceptTrack(curTrack) ){
+      fChargedParticles.push_back(curTrack);
+      fChargedParticlesId.push_back(iTracks);
+    }
+  }
+}
+void AliAnalysisTaskGammaConversion::CalculateJetCone(Int_t gammaIndex, Int_t fLeadingChargedIndex){
+  // CalculateJetCone
+
+  Double_t cone;
+  Double_t coneSize=0.3;
+  Double_t ptJet=0;
+  
+  AliKFParticle * currentGamma = &fKFReconstructedGammas[gammaIndex];
+  TVector3 MomentumVectorCurrentGamma(currentGamma->GetPx(),currentGamma->GetPy(),currentGamma->GetPz());
+
+  AliESDtrack* leadingCharged = fChargedParticles[fLeadingChargedIndex];
+  Double_t momLeadingCharged[3];
+  leadingCharged->GetConstrainedPxPyPz(momLeadingCharged);
+
+  TVector3 MomentumVectorLeadingCharged(momLeadingCharged[0],momLeadingCharged[1],momLeadingCharged[2]);
+
+  Double_t phi1=MomentumVectorLeadingCharged.Phi();
+  Double_t eta1=MomentumVectorLeadingCharged.Eta();
+  Double_t phi3=MomentumVectorCurrentGamma.Phi();
+
+  for(UInt_t iCh=0;iCh<fChargedParticles.size();iCh++){
+    AliESDtrack* curTrack = fChargedParticles[iCh];
+    Int_t chId = fChargedParticlesId[iCh];
+    if(fLeadingChargedIndex==chId || fLeadingChargedIndex==chId) continue;
+    Double_t mom[3];
+    curTrack->GetConstrainedPxPyPz(mom);
+    TVector3 MomentumVectorChargedParticle(mom[0],mom[1],mom[2]);
+    Double_t phi2=MomentumVectorChargedParticle.Phi();
+    Double_t eta2=MomentumVectorChargedParticle.Eta();
+
+
+    cone=100.;
+    if( TMath::Abs(phi2 - phi1) <= ( TMath::TwoPi()-coneSize) ){
+      cone = TMath::Sqrt(  TMath::Power((eta2-eta1),2)+ TMath::Power((phi2-phi1),2) );
+    }else{
+      if( (phi2 - phi1)> TMath::TwoPi()-coneSize ){
+       cone = TMath::Sqrt(  TMath::Power((eta2-eta1),2)+ TMath::Power((phi2-TMath::TwoPi()-phi1),2) );
+      }
+      if( (phi2 - phi1)< -(TMath::TwoPi()-coneSize) ){
+       cone = TMath::Sqrt(  TMath::Power((eta2-eta1),2)+ TMath::Power((phi2+TMath::TwoPi()-phi1),2) );
+      }
+    }
+    
+    if(cone <coneSize&& MomentumVectorChargedParticle.Pt()>fMinPtJetCone ){
+      ptJet+= MomentumVectorChargedParticle.Pt();
+      Double_t ffzHdrGam = MomentumVectorChargedParticle.Pt()/MomentumVectorCurrentGamma.Pt();
+      Double_t imbalanceHdrGam=-MomentumVectorChargedParticle.Dot(MomentumVectorCurrentGamma)/MomentumVectorCurrentGamma.Mag2();
+      fHistograms->FillHistogram("ESD_FFzHdrGam",ffzHdrGam);
+      fHistograms->FillHistogram("ESD_ImbalanceHdrGam",imbalanceHdrGam);
+
+    }
+    
+    Double_t dphiHdrGam=phi3-phi2;
+    if ( dphiHdrGam < (-TMath::PiOver2())){
+      dphiHdrGam+=(TMath::TwoPi());
+    }
+    
+    if ( dphiHdrGam > (3.*TMath::PiOver2()) ){
+      dphiHdrGam-=(TMath::TwoPi());
+    }
+
+    if (MomentumVectorChargedParticle.Pt()>fMinPtGamChargedCorr){
+      fHistograms->FillHistogram("ESD_dphiHdrGamIsolated",dphiHdrGam);
+    }
+  }//track loop
+
+
+}
+
+Double_t AliAnalysisTaskGammaConversion::GetMinimumDistanceToCharge(Int_t indexHighestPtGamma){
+  // GetMinimumDistanceToCharge
+
+  Double_t fIsoMin=100.;
+  Double_t ptLeadingCharged=-1.;
+
+  AliKFParticle * gammaHighestPt = &fKFReconstructedGammas[indexHighestPtGamma];
+  TVector3 MomentumVectorgammaHighestPt(gammaHighestPt->GetPx(),gammaHighestPt->GetPy(),gammaHighestPt->GetPz());
+  Double_t phi1=MomentumVectorgammaHighestPt.Phi();
+  Double_t eta1=MomentumVectorgammaHighestPt.Eta();
+  
+  for(UInt_t iCh=0;iCh<fChargedParticles.size();iCh++){
+    AliESDtrack* curTrack = fChargedParticles[iCh];
+    Int_t chId = fChargedParticlesId[iCh];
+    if(fElectronv1[indexHighestPtGamma]==chId || fElectronv2[indexHighestPtGamma]==chId) continue;
+    Double_t mom[3];
+    curTrack->GetConstrainedPxPyPz(mom);
+    TVector3 MomentumVectorChargedParticle(mom[0],mom[1],mom[2]);
+    Double_t phi2=MomentumVectorChargedParticle.Phi();
+    Double_t eta2=MomentumVectorChargedParticle.Eta();
+    Double_t iso=pow(  (pow( (eta1-eta2),2)+ pow((phi1-phi2),2)),0.5 );
+    
+    if(MomentumVectorChargedParticle.Pt()>fMinPtIsoCone ){
+      if (iso<fIsoMin){
+       fIsoMin=iso;
+      }
+    }
+    
+    Double_t dphiHdrGam=phi1-phi2;
+    if ( dphiHdrGam < (-TMath::PiOver2())){
+      dphiHdrGam+=(TMath::TwoPi());
+    }
+    
+    if ( dphiHdrGam > (3.*TMath::PiOver2()) ){
+      dphiHdrGam-=(TMath::TwoPi());
+    }
+    if (MomentumVectorChargedParticle.Pt()>fMinPtGamChargedCorr){
+      fHistograms->FillHistogram("ESD_dphiHdrGam",dphiHdrGam);
+    }
+    
+    if (dphiHdrGam>0.9*TMath::Pi() && dphiHdrGam<1.1*TMath::Pi()){
+     if (MomentumVectorChargedParticle.Pt()> ptLeadingCharged && MomentumVectorChargedParticle.Pt()>0.1*MomentumVectorgammaHighestPt.Pt()){
+       ptLeadingCharged=MomentumVectorChargedParticle.Pt();
+       fLeadingChargedIndex=iCh;
+      }
+    }
+    
+  }//track loop
+  fHistograms->FillHistogram("ESD_MinimumIsoDistance",fIsoMin);
+  return fIsoMin;
+
+}
+
+ Int_t  AliAnalysisTaskGammaConversion::GetIndexHighestPtGamma(){
+   //GetIndexHighestPtGamma
+
+  Int_t indexHighestPtGamma=-1;
+  Double_t fGammaPtHighest = -100.;
+  
+  for(UInt_t firstGammaIndex=0;firstGammaIndex<fKFReconstructedGammas.size();firstGammaIndex++){
+     AliKFParticle * gammaHighestPtCandidate = &fKFReconstructedGammas[firstGammaIndex];
+     TVector3 MomentumVectorgammaHighestPtCandidate(gammaHighestPtCandidate->GetPx(),gammaHighestPtCandidate->GetPy(),gammaHighestPtCandidate->GetPz());
+     if (MomentumVectorgammaHighestPtCandidate.Pt() > fGammaPtHighest){
+       fGammaPtHighest=MomentumVectorgammaHighestPtCandidate.Pt();
+       //gammaHighestPt = gammaHighestPtCandidate;
+       indexHighestPtGamma=firstGammaIndex;
+     }
+  }
+  
+  return indexHighestPtGamma;
+
+}
+
+
+void AliAnalysisTaskGammaConversion::Terminate(Option_t */*option*/)
+{
+  // Terminate analysis
+  //
+  AliDebug(1,"Do nothing in Terminate");
+}
+
+void AliAnalysisTaskGammaConversion::UserCreateOutputObjects()
+{
+  //AOD
+  fAODBranch = new TClonesArray("AliGammaConversionAODObject", 0);
+  fAODBranch->SetName(fAODBranchName); 
+  AddAODBranch("TClonesArray", &fAODBranch);
+
+  // Create the output container
+  if(fOutputContainer != NULL){
+    delete fOutputContainer;
+    fOutputContainer = NULL;
+  }
+  if(fOutputContainer == NULL){
+    fOutputContainer = new TList();
+  }
+       
+  //Adding the histograms to the output container
+  fHistograms->GetOutputContainer(fOutputContainer);
+       
+       
+  if(fWriteNtuple){
+    if(fGammaNtuple == NULL){
+      fGammaNtuple = new TNtuple("V0ntuple","V0ntuple","OnTheFly:HasVertex:NegPIDProb:PosPIDProb:X:Y:Z:R:MotherCandidateNDF:MotherCandidateChi2:MotherCandidateEnergy:MotherCandidateEta:MotherCandidatePt:MotherCandidateMass:MotherCandidateWidth:MCMotherCandidatePT:EPOpeningAngle:ElectronEnergy:ElectronPt:ElectronEta:ElectronPhi:PositronEnergy:PositronPt:PositronEta:PositronPhi:HasSameMCMother:MotherMCParticlePIDCode",50000);
+    }
+    if(fNeutralMesonNtuple == NULL){
+      fNeutralMesonNtuple = new TNtuple("NeutralMesonNtuple","NeutralMesonNtuple","test");
+    }
+    TList * ntupleTList = new TList();
+    ntupleTList->SetName("Ntuple");
+    ntupleTList->Add((TNtuple*)fGammaNtuple);
+    fOutputContainer->Add(ntupleTList);
+  }
+       
+  fOutputContainer->SetName(GetName());
+}
+
+Double_t AliAnalysisTaskGammaConversion::GetMCOpeningAngle(TParticle* const daughter0, TParticle* const daughter1) const{
+  //helper function
+  TVector3 v3D0(daughter0->Px(),daughter0->Py(),daughter0->Pz());
+  TVector3 v3D1(daughter1->Px(),daughter1->Py(),daughter1->Pz());
+  return v3D0.Angle(v3D1);
+}
+
+void AliAnalysisTaskGammaConversion::CheckV0Efficiency(){
+  // see header file for documentation
+
+  vector<Int_t> indexOfGammaParticle;
+
+  fStack = fV0Reader->GetMCStack();
+
+  if(fV0Reader->CheckForPrimaryVertex() == kFALSE){
+    return; // aborts if the primary vertex does not have contributors.
+  }
+
+  for (Int_t iTracks = 0; iTracks < fStack->GetNprimary(); iTracks++) {
+    TParticle* particle = (TParticle *)fStack->Particle(iTracks);
+    if(particle->GetPdgCode()==22){     //Gamma
+      if(particle->GetNDaughters() >= 2){
+       TParticle* electron=NULL;
+       TParticle* positron=NULL; 
+       for(Int_t daughterIndex=particle->GetFirstDaughter();daughterIndex<=particle->GetLastDaughter();daughterIndex++){
+         TParticle *tmpDaughter = fStack->Particle(daughterIndex);
+         if(tmpDaughter->GetUniqueID() == 5){
+           if(tmpDaughter->GetPdgCode() == 11){
+             electron = tmpDaughter;
+           }
+           else if(tmpDaughter->GetPdgCode() == -11){
+             positron = tmpDaughter;
+           }
+         }
+       }
+       if(electron!=NULL && positron!=0){
+         if(electron->R()<160){
+           indexOfGammaParticle.push_back(iTracks);
+         }
+       }
+      }
+    }
+  }
+
+  Int_t nFoundGammas=0;
+  Int_t nNotFoundGammas=0;
+
+  Int_t numberOfV0s = fV0Reader->GetNumberOfV0s();
+  for(Int_t i=0;i<numberOfV0s;i++){
+    fV0Reader->GetV0(i);
+    
+    if(fV0Reader->HasSameMCMother() == kFALSE){
+      continue;
+    }
+    
+    TParticle * negativeMC = (TParticle*)fV0Reader->GetNegativeMCParticle();
+    TParticle * positiveMC = (TParticle*)fV0Reader->GetPositiveMCParticle();
+    
+    if(TMath::Abs(negativeMC->GetPdgCode())!=11 || TMath::Abs(positiveMC->GetPdgCode())!=11){
+      continue;
+    }
+    if(negativeMC->GetPdgCode()==positiveMC->GetPdgCode()){
+      continue;
+    }
+    
+    if(fV0Reader->GetMotherMCParticle()->GetPdgCode() == 22){
+      //TParticle * v0Gamma = fV0Reader->GetMotherMCParticle();
+      for(UInt_t mcIndex=0;mcIndex<indexOfGammaParticle.size();mcIndex++){
+       if(negativeMC->GetFirstMother()==indexOfGammaParticle[mcIndex]){
+         nFoundGammas++;
+       }
+       else{
+         nNotFoundGammas++;
+       }
+      }
+    }
+  }
+  //  cout<<"Found: "<<nFoundGammas<<"  of: "<<indexOfGammaParticle.size()<<endl;
+}
+
+
+void AliAnalysisTaskGammaConversion::ProcessGammaElectronsForChicAnalysis(){
+  // see header file for documantation
+
+  fESDEvent = fV0Reader->GetESDEvent();
+
+
+  vector <AliESDtrack*> vESDeNegTemp(0);
+  vector <AliESDtrack*> vESDePosTemp(0);
+  vector <AliESDtrack*> vESDxNegTemp(0);
+  vector <AliESDtrack*> vESDxPosTemp(0);
+  vector <AliESDtrack*> vESDeNegNoJPsi(0);
+  vector <AliESDtrack*> vESDePosNoJPsi(0); 
+
+
+
+  fHistograms->FillTable("Table_Electrons",0);//Count number of Events
+
+  for(Int_t iTracks = 0; iTracks < fESDEvent->GetNumberOfTracks(); iTracks++){
+    AliESDtrack* curTrack = fESDEvent->GetTrack(iTracks);
+
+    if(!curTrack){
+      //print warning here
+      continue;
+    }
+
+    double p[3];if(!curTrack->GetConstrainedPxPyPz(p))continue;
+    double r[3];curTrack->GetConstrainedXYZ(r);
+
+    TVector3 rXYZ(r);
+
+    fHistograms->FillTable("Table_Electrons",4);//Count number of ESD tracks
+
+    Bool_t flagKink       =  kTRUE;
+    Bool_t flagTPCrefit   =  kTRUE;
+    Bool_t flagTRDrefit   =  kTRUE;
+    Bool_t flagITSrefit   =  kTRUE;
+    Bool_t flagTRDout     =  kTRUE;
+    Bool_t flagVertex     =  kTRUE;
+
+
+    //Cuts ---------------------------------------------------------------
+
+    if(curTrack->GetKinkIndex(0) > 0){
+      fHistograms->FillHistogram("Table_Electrons",5);//Count kink
+      flagKink = kFALSE;
+    }
+
+    ULong_t trkStatus = curTrack->GetStatus();
+
+    ULong_t tpcRefit = (trkStatus & AliESDtrack::kTPCrefit);
+
+    if(!tpcRefit){
+      fHistograms->FillHistogram("Table_Electrons",9);//Count not TPCrefit
+      flagTPCrefit = kFALSE;
+    }
+
+    ULong_t itsRefit = (trkStatus & AliESDtrack::kITSrefit);
+    if(!itsRefit){
+      fHistograms->FillHistogram("Table_Electrons",10);//Count not ITSrefit
+      flagITSrefit = kFALSE;
+    }
+
+    ULong_t trdRefit = (trkStatus & AliESDtrack::kTRDrefit);
+
+    if(!trdRefit){
+      fHistograms->FillHistogram("Table_Electrons",8); //Count not TRDrefit
+      flagTRDrefit = kFALSE;
+    }
+
+    ULong_t trdOut = (trkStatus & AliESDtrack::kTRDout);
+
+    if(!trdOut) {
+      fHistograms->FillHistogram("Table_Electrons",7); //Count not TRDout
+      flagTRDout = kFALSE;
+    }
+
+    double nsigmaToVxt = GetSigmaToVertex(curTrack);
+
+    if(nsigmaToVxt > 3){
+      fHistograms->FillHistogram("Table_Electrons",6); //Count Tracks with number of sigmas > 3
+      flagVertex = kFALSE;
+    }
+
+    if(! (flagKink && flagTPCrefit && flagITSrefit && flagTRDrefit && flagTRDout && flagVertex ) ) continue;
+    fHistograms->FillHistogram("Table_Electrons",11);//Count Tracks passed Cuts
+
+
+    Stat_t pid, weight;
+    GetPID(curTrack, pid, weight);
+
+    if(pid!=0){
+      fHistograms->FillHistogram("Table_Electrons",12); //Count Tracks with pid != 0
+    }
+
+    if(pid == 0){
+      fHistograms->FillHistogram("Table_Electrons",13); //Count Tracks with pid != 0
+    }
+
+
+
+
+    Int_t labelMC = TMath::Abs(curTrack->GetLabel());
+    TParticle* curParticle = fStack->Particle(labelMC);
+
+
+
+
+    TLorentzVector curElec;
+    curElec.SetXYZM(p[0],p[1],p[2],fElectronMass);
+
+
+
+
+    if(curTrack->GetSign() > 0){
+
+      vESDxPosTemp.push_back(curTrack);
+
+      if( pid == 0){
+
+       fHistograms->FillHistogram("ESD_ElectronPosNegPt",curElec.Pt());
+       fHistograms->FillHistogram("ESD_ElectronPosPt",curElec.Pt());
+       fHistograms->FillHistogram("MC_ElectronPosNegPt",curParticle->Pt());
+       fHistograms->FillHistogram("ESD_ElectronPosNegEta",curElec.Eta());
+       fHistograms->FillHistogram("MC_ElectronPosNegEta",curParticle->Eta());
+       vESDePosTemp.push_back(curTrack);
+
+
+
+      }
+
+    }
+    else {
+      vESDxNegTemp.push_back(curTrack);
+
+      if( pid == 0){
+
+       fHistograms->FillHistogram("ESD_ElectronPosNegPt",curElec.Pt());
+       fHistograms->FillHistogram("ESD_ElectronNegPt",curElec.Pt());
+       fHistograms->FillHistogram("MC_ElectronPosNegPt",curParticle->Pt());
+       fHistograms->FillHistogram("ESD_ElectronPosNegEta",curElec.Eta());
+       fHistograms->FillHistogram("MC_ElectronPosNegEta",curParticle->Eta());
+       vESDeNegTemp.push_back(curTrack);
+
+
+
+
+      }
+    }
+
+  }
+
+
+  Bool_t ePosJPsi = kFALSE;
+  Bool_t eNegJPsi = kFALSE;            
+  Bool_t ePosPi0  = kFALSE;
+  Bool_t eNegPi0  = kFALSE;
+       
+  UInt_t iePosJPsi=0,ieNegJPsi=0,iePosPi0=0,ieNegPi0=0;
+  for(UInt_t iNeg=0; iNeg < vESDeNegTemp.size(); iNeg++){
+    if(fStack->Particle(TMath::Abs(vESDeNegTemp[iNeg]->GetLabel()))->GetPdgCode() == 11)
+      if(fStack->Particle(TMath::Abs(vESDeNegTemp[iNeg]->GetLabel()))->GetMother(0) > -1){
+       Int_t labelMother = fStack->Particle(TMath::Abs(vESDeNegTemp[iNeg]->GetLabel()))->GetMother(0);
+       TParticle* partMother = fStack ->Particle(labelMother);
+       if (partMother->GetPdgCode() == 111){
+         ieNegPi0 = iNeg;
+         eNegPi0 = kTRUE;
+       }
+       if(partMother->GetPdgCode() == 443){ //Mother JPsi
+         fHistograms->FillTable("Table_Electrons",14);
+         ieNegJPsi = iNeg;
+         eNegJPsi = kTRUE;
+       }
+       else{   
+         vESDeNegNoJPsi.push_back(vESDeNegTemp[iNeg]);
+         //            cout<<"ESD No Positivo JPsi "<<endl;
+       }
+
+      }
+  }    
+
+  for(UInt_t iPos=0; iPos < vESDePosTemp.size(); iPos++){
+    if(fStack->Particle(TMath::Abs(vESDePosTemp[iPos]->GetLabel()))->GetPdgCode() == -11)
+      if(fStack->Particle(TMath::Abs(vESDePosTemp[iPos]->GetLabel()))->GetMother(0) > -1){
+       Int_t labelMother = fStack->Particle(TMath::Abs(vESDePosTemp[iPos]->GetLabel()))->GetMother(0);
+       TParticle* partMother = fStack ->Particle(labelMother);
+       if (partMother->GetPdgCode() == 111){
+         iePosPi0 = iPos;
+         ePosPi0 = kTRUE;
+       }
+       if(partMother->GetPdgCode() == 443){ //Mother JPsi
+         fHistograms->FillTable("Table_Electrons",15);
+         iePosJPsi = iPos;
+         ePosJPsi = kTRUE;
+       }
+       else{
+         vESDePosNoJPsi.push_back(vESDePosTemp[iPos]);
+         //            cout<<"ESD No Negativo JPsi "<<endl;
+       }
+
+      }
+  }
+       
+  if( eNegJPsi && ePosJPsi ){
+    TVector3 tempeNegV,tempePosV;
+    tempeNegV.SetXYZ(vESDeNegTemp[ieNegJPsi]->Px(),vESDeNegTemp[ieNegJPsi]->Py(),vESDeNegTemp[ieNegJPsi]->Pz());                       
+    tempePosV.SetXYZ(vESDePosTemp[iePosJPsi]->Px(),vESDePosTemp[iePosJPsi]->Py(),vESDePosTemp[iePosJPsi]->Pz());
+    fHistograms->FillTable("Table_Electrons",16);
+    fHistograms->FillHistogram("ESD_ElectronPosNegJPsiAngle",tempeNegV.Angle(tempePosV));      
+    fHistograms->FillHistogram("MC_ElectronPosNegJPsiAngle",GetMCOpeningAngle(fStack->Particle(TMath::Abs(vESDeNegTemp[ieNegJPsi]->GetLabel())),
+                                                                             fStack->Particle(TMath::Abs(vESDePosTemp[iePosJPsi]->GetLabel()))));      
+  }
+       
+  if( eNegPi0 && ePosPi0 ){
+    TVector3 tempeNegV,tempePosV;
+    tempeNegV.SetXYZ(vESDeNegTemp[ieNegPi0]->Px(),vESDeNegTemp[ieNegPi0]->Py(),vESDeNegTemp[ieNegPi0]->Pz());
+    tempePosV.SetXYZ(vESDePosTemp[iePosPi0]->Px(),vESDePosTemp[iePosPi0]->Py(),vESDePosTemp[iePosPi0]->Pz());
+    fHistograms->FillHistogram("ESD_ElectronPosNegPi0Angle",tempeNegV.Angle(tempePosV));
+    fHistograms->FillHistogram("MC_ElectronPosNegPi0Angle",GetMCOpeningAngle(fStack->Particle(TMath::Abs(vESDeNegTemp[ieNegPi0]->GetLabel())),
+                                                                            fStack->Particle(TMath::Abs(vESDePosTemp[iePosPi0]->GetLabel()))));   
+  }
+        
+
+  FillAngle("ESD_eNegePosAngleBeforeCut",GetTLorentzVector(vESDeNegTemp),GetTLorentzVector(vESDePosTemp));
+
+  CleanWithAngleCuts(vESDeNegTemp,vESDePosTemp,fKFReconstructedGammas);
+       
+  vector <TLorentzVector> vCurrentTLVeNeg = GetTLorentzVector(fCurrentEventNegElectron);
+  vector <TLorentzVector> vCurrentTLVePos = GetTLorentzVector(fCurrentEventPosElectron);
+
+
+  FillAngle("ESD_eNegePosAngleAfterCut",vCurrentTLVeNeg,vCurrentTLVePos);
+
+
+
+  //FillAngle("ESD_eNegePosAngleAfterCut",CurrentTLVeNeg,CurrentTLVePos);
+
+
+  FillElectronInvMass("ESD_InvMass_ePluseMinus",vCurrentTLVeNeg,vCurrentTLVePos);
+  FillElectronInvMass("ESD_InvMass_xPlusxMinus",GetTLorentzVector(vESDxNegTemp),GetTLorentzVector(vESDxPosTemp));
+
+       
+
+  FillGammaElectronInvMass("ESD_InvMass_GammaePluseMinusChiC","ESD_InvMass_GammaePluseMinusChiCDiff",
+                          fKFReconstructedGammasCut,vCurrentTLVeNeg,vCurrentTLVePos);
+
+  FillGammaElectronInvMass("ESD_InvMass_GammaePluseMinusPi0","ESD_InvMass_GammaePluseMinusPi0Diff",
+                          fKFReconstructedGammasCut,vCurrentTLVeNeg,vCurrentTLVePos);
+
+  //BackGround
+
+  //Like Sign e+e-
+  ElectronBackground("ESD_ENegBackground",vCurrentTLVeNeg);
+  ElectronBackground("ESD_EPosBackground",vCurrentTLVePos);
+  ElectronBackground("ESD_EPosENegBackground",vCurrentTLVeNeg);
+  ElectronBackground("ESD_EPosENegBackground",vCurrentTLVePos);
+
+  //        Like Sign e+e- no JPsi
+  ElectronBackground("ESD_EPosENegNoJPsiBG",GetTLorentzVector(vESDeNegNoJPsi));
+  ElectronBackground("ESD_EPosENegNoJPsiBG",GetTLorentzVector(vESDePosNoJPsi));
+
+  //Mixed Event
+
+  if( fCurrentEventPosElectron.size() > 0 && fCurrentEventNegElectron.size() > 0 && fKFReconstructedGammasCut.size() > 0 ){
+    FillGammaElectronInvMass("ESD_EPosENegGammaBackgroundMX","ESD_EPosENegGammaBackgroundMXDiff",
+                            fKFReconstructedGammasCut,fPreviousEventTLVNegElectron,fPreviousEventTLVPosElectron);
+    fPreviousEventTLVNegElectron = vCurrentTLVeNeg;
+    fPreviousEventTLVPosElectron = vCurrentTLVePos;
+
+  }
+
+  /*
+  //Photons P
+  Double_t vtx[3];
+  vtx[0]=0;vtx[1]=0;vtx[2]=0;
+  for(UInt_t i=0;i<fKFReconstructedGammasChic.size();i++){
+
+  //      if(fMCGammaChicTempCut[i]->GetMother(0) < 0) continue;
+
+
+
+  Int_t tempLabel = fStack->Particle(fMCGammaChicTempCut[i]->GetMother(0))->GetPdgCode();
+  //      cout<<" Label Pedro Gonzalez " <<tempLabel <<endl;
+
+  //      cout<<" Label Distance"<<fKFReconstructedGammasChic[i].GetDistanceFromVertex(vtx)<<endl;
+
+  if( tempLabel == 10441 || tempLabel == 20443 || tempLabel == 445 )
+
+  fHistograms->FillHistogram("ESD_PhotonsMomentum",fKFReconstructedGammasChic[i].GetMomentum());
+
+
+  }
+
+
+  */
+
+
+}
+
+void AliAnalysisTaskGammaConversion::FillAngle(TString histoName,vector <TLorentzVector> tlVeNeg, vector <TLorentzVector> tlVePos){
+  //see header file for documentation
+  for( UInt_t iNeg=0; iNeg < tlVeNeg.size(); iNeg++){
+    for (UInt_t iPos=0; iPos < tlVePos.size(); iPos++){
+      fHistograms->FillHistogram(histoName.Data(),tlVeNeg[iNeg].Vect().Angle(tlVePos[iPos].Vect()));
+    }
+  }
+}
+void AliAnalysisTaskGammaConversion::FillElectronInvMass(TString histoName, vector <TLorentzVector> eNeg, vector <TLorentzVector> ePos){
+  //see header file for documentation
+  for( UInt_t n=0; n < eNeg.size(); n++){
+
+    TLorentzVector en = eNeg.at(n);
+    for (UInt_t p=0; p < ePos.size(); p++){
+      TLorentzVector ep = ePos.at(p);
+      TLorentzVector np = ep + en;
+      fHistograms->FillHistogram(histoName.Data(),np.M());
+    }
+  }
+
+}
+
+void AliAnalysisTaskGammaConversion::FillGammaElectronInvMass(TString histoMass,TString histoDiff,vector <AliKFParticle> fKFGammas,
+                                                             vector <TLorentzVector> tlVeNeg,vector<TLorentzVector> tlVePos)
+{
+  //see header file for documentation
+
+  for( UInt_t iNeg=0; iNeg < tlVeNeg.size(); iNeg++ ){
+
+    for (UInt_t iPos=0; iPos < tlVePos.size(); iPos++){
+
+      TLorentzVector xy = tlVePos[iPos] + tlVeNeg[iNeg];
+
+      for (UInt_t iGam=0; iGam < fKFGammas.size(); iGam++){
+
+       AliKFParticle * gammaCandidate = &fKFGammas[iGam];
+       TLorentzVector g;
+
+       g.SetXYZM(gammaCandidate->GetPx(),gammaCandidate->GetPy(),gammaCandidate->GetPz(),fGammaMass);
+       TLorentzVector xyg = xy + g;
+       fHistograms->FillHistogram(histoMass.Data(),xyg.M());
+       fHistograms->FillHistogram(histoDiff.Data(),(xyg.M()-xy.M()));
+      }
+    }
+  }
+
+}
+void AliAnalysisTaskGammaConversion::ElectronBackground(TString hBg, vector <TLorentzVector> e)
+{
+  // see header file for documentation
+  for(UInt_t i=0; i < e.size(); i++)
+    {
+      for (UInt_t j=i+1; j < e.size(); j++)
+       {
+         TLorentzVector ee = e[i] + e[j];
+
+         fHistograms->FillHistogram(hBg.Data(),ee.M());
+       }
+    }
+}
+
+
+void AliAnalysisTaskGammaConversion::CleanWithAngleCuts(vector <AliESDtrack*> negativeElectrons,
+                                                       vector <AliESDtrack*> positiveElectrons, vector <AliKFParticle> gammas){
+  // see header file for documentation
+
+  UInt_t  sizeN = negativeElectrons.size();
+  UInt_t  sizeP = positiveElectrons.size();
+  UInt_t  sizeG = gammas.size();
+
+
+
+  vector <Bool_t> xNegBand(sizeN);
+  vector <Bool_t> xPosBand(sizeP);
+  vector <Bool_t> gammaBand(sizeG);
+
+
+  for(UInt_t iNeg=0; iNeg < sizeN; iNeg++) xNegBand[iNeg]=kTRUE;
+  for(UInt_t iPos=0; iPos < sizeP; iPos++) xPosBand[iPos]=kTRUE;
+  for(UInt_t iGam=0; iGam < sizeG; iGam++) gammaBand[iGam]=kTRUE;
+
+
+  for(UInt_t iPos=0; iPos < sizeP; iPos++){
+       
+    Double_t aP[3]; positiveElectrons[iPos]->GetConstrainedPxPyPz(aP); 
+
+    TVector3 ePosV(aP[0],aP[1],aP[2]);
+
+    for(UInt_t iNeg=0; iNeg < sizeN; iNeg++){
+       
+      Double_t aN[3]; negativeElectrons[iNeg]->GetConstrainedPxPyPz(aN); 
+      TVector3 eNegV(aN[0],aN[1],aN[2]);
+
+      if(ePosV.Angle(eNegV) < 0.05){ //e+e- from gamma
+       xPosBand[iPos]=kFALSE;
+       xNegBand[iNeg]=kFALSE;
+      }
+
+      for(UInt_t iGam=0; iGam < sizeG; iGam++){
+       AliKFParticle* gammaCandidate = &gammas[iGam];
+       TVector3 gammaCandidateVector(gammaCandidate->Px(),gammaCandidate->Py(),gammaCandidate->Pz());
+       if(ePosV.Angle(gammaCandidateVector) < 0.05 || eNegV.Angle(gammaCandidateVector) < 0.05)
+         gammaBand[iGam]=kFALSE;
+      }
+    }
+  }
+
+
+
+
+  for(UInt_t iPos=0; iPos < sizeP; iPos++){
+    if(xPosBand[iPos]){
+      fCurrentEventPosElectron.push_back(positiveElectrons[iPos]);
+    }
+  }
+  for(UInt_t iNeg=0;iNeg < sizeN; iNeg++){
+    if(xNegBand[iNeg]){
+      fCurrentEventNegElectron.push_back(negativeElectrons[iNeg]);
+    }
+  }
+  for(UInt_t iGam=0; iGam < sizeG; iGam++){
+    if(gammaBand[iGam]){
+      fKFReconstructedGammasCut.push_back(gammas[iGam]);
+    }
+  }
+}
+
+
+void  AliAnalysisTaskGammaConversion::GetPID(AliESDtrack *track, Stat_t &pid, Stat_t &weight)
+{
+  // see header file for documentation
+  pid = -1;
+  weight = -1;
+
+  double wpart[5];
+  double wpartbayes[5];
+
+  //get probability of the diffenrent particle types
+  track->GetESDpid(wpart);
+
+  // Tentative particle type "concentrations"
+  double c[5]={0.01, 0.01, 0.85, 0.10, 0.05};
+
+  //Bayes' formula
+  double rcc = 0.;
+  for (int i = 0; i < 5; i++)
+    {
+      rcc+=(c[i] * wpart[i]);
+    }
+
+
+
+  for (int i=0; i<5; i++) {
+    if( rcc!=0){
+      wpartbayes[i] = c[i] * wpart[i] / rcc;
+    }
+  }
+
+
+
+  Float_t max=0.;
+  int ipid=-1;
+  //find most probable particle in ESD pid
+  //0:Electron - 1:Muon - 2:Pion - 3:Kaon - 4:Proton
+  for (int i = 0; i < 5; i++)
+    {
+      if (wpartbayes[i] > max)
+        {
+          ipid = i;
+          max = wpartbayes[i];
+        }
+    }
+
+  pid = ipid;
+  weight = max;
+}
+double AliAnalysisTaskGammaConversion::GetSigmaToVertex(AliESDtrack* t)
+{
+  // Calculates the number of sigma to the vertex.
+
+  Float_t b[2];
+  Float_t bRes[2];
+  Float_t bCov[3];
+  t->GetImpactParameters(b,bCov);
+  if (bCov[0]<=0 || bCov[2]<=0) {
+    AliDebug(1, "Estimated b resolution lower or equal zero!");
+    bCov[0]=0; bCov[2]=0;
+  }
+  bRes[0] = TMath::Sqrt(bCov[0]);
+  bRes[1] = TMath::Sqrt(bCov[2]);
+
+  // -----------------------------------
+  // How to get to a n-sigma cut?
+  //
+  // The accumulated statistics from 0 to d is
+  //
+  // ->  Erf(d/Sqrt(2)) for a 1-dim gauss (d = n_sigma)
+  // ->  1 - Exp(-d**2) for a 2-dim gauss (d*d = dx*dx + dy*dy != n_sigma)
+  //
+  // It means that for a 2-dim gauss: n_sigma(d) = Sqrt(2)*ErfInv(1 - Exp((-x**2)/2)
+  // Can this be expressed in a different way?
+
+  if (bRes[0] == 0 || bRes[1] ==0)
+    return -1;
+
+  double d = TMath::Sqrt(TMath::Power(b[0]/bRes[0],2) + TMath::Power(b[1]/bRes[1],2));
+
+  // stupid rounding problem screws up everything:
+  // if d is too big, TMath::Exp(...) gets 0, and TMath::ErfInverse(1) that should be infinite, gets 0 :(
+  if (TMath::Exp(-d * d / 2) < 1e-10)
+    return 1000;
+
+
+  d = TMath::ErfInverse(1 - TMath::Exp(-d * d / 2)) * TMath::Sqrt(2);
+  return d;
+}
+vector <TLorentzVector> AliAnalysisTaskGammaConversion::GetTLorentzVector(vector <AliESDtrack*> esdTrack){
+
+  vector <TLorentzVector> tlVtrack(0);
+
+  for(UInt_t itrack=0; itrack < esdTrack.size(); itrack++){
+    double P[3]; esdTrack[itrack]->GetConstrainedPxPyPz(P);
+    TLorentzVector currentTrack;
+    currentTrack.SetXYZM(P[0],P[1],P[2],fElectronMass);
+    tlVtrack.push_back(currentTrack);
+  }
+
+  return tlVtrack;
+}
+