Bugfix: Cut histograms filled wrongly.

[u/mrichter/AliRoot.git] / PWG4 / GammaConv / AliV0Reader.cxx

/**************************************************************************
 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
 *                                                                        *
 * Author: Ana Marin, Kathrin Koch, Kenneth Aamodt                        *
 * Version 1.0                                                            *
 *                                                                        *
 * 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 system ---
#include <TMath.h>

//---- ANALYSIS system ----
#include "AliV0Reader.h"
#include "AliAnalysisManager.h"
#include "AliESDInputHandler.h"
#include "AliESDtrack.h"
#include "AliMCEvent.h"
#include "AliKFVertex.h"

#include "AliStack.h"
#include "AliMCEventHandler.h"
#include "AliESDpid.h"
#include "AliGammaConversionBGHandler.h"
#include "AliESDtrackCuts.h"


class iostream;
class AliESDv0;
class TFormula;

using namespace std;

ClassImp(AliV0Reader)



AliV0Reader::AliV0Reader() :
  TObject(),
  fMCStack(NULL),
  fMCTruth(NULL),
  fMCEvent(NULL),    // for CF
  fChain(NULL),
  fESDHandler(NULL),
  fESDEvent(NULL),
  fCFManager(NULL),
  fESDpid(NULL),
  fHistograms(NULL),
  fCurrentV0IndexNumber(0),
  fCurrentV0(NULL),
  fCurrentNegativeKFParticle(NULL),
  fCurrentPositiveKFParticle(NULL),
  fCurrentMotherKFCandidate(NULL),
  fCurrentNegativeESDTrack(NULL),
  fCurrentPositiveESDTrack(NULL),
  fNegativeTrackLorentzVector(NULL),
  fPositiveTrackLorentzVector(NULL),
  fMotherCandidateLorentzVector(NULL),
  fCurrentXValue(0),
  fCurrentYValue(0),
  fCurrentZValue(0),
  fPositiveTrackPID(0),
  fNegativeTrackPID(0),
  fNegativeMCParticle(NULL),
  fPositiveMCParticle(NULL),
  fMotherMCParticle(NULL),
  fMotherCandidateKFMass(0),
  fMotherCandidateKFWidth(0),
  fUseKFParticle(kTRUE),
  fUseESDTrack(kFALSE),
  fDoMC(kFALSE),
  fMaxR(10000),// 100 meter(outside of ALICE)
  fEtaCut(0.),
  fPtCut(0.),
  fMaxZ(0.),
  fLineCutZRSlope(0.),
  fLineCutZValue(0.),
  fChi2CutConversion(0.),
  fChi2CutMeson(0.),
  fPIDProbabilityCutNegativeParticle(0),
  fPIDProbabilityCutPositiveParticle(0),
  fDodEdxSigmaCut(kFALSE),
  fPIDnSigmaAboveElectronLine(100),
  fPIDnSigmaBelowElectronLine(-100),
  fPIDnSigmaAbovePionLine(-100), 
  fPIDMinPnSigmaAbovePionLine(100), 
  fXVertexCut(0.),
  fYVertexCut(0.),
  fZVertexCut(0.),
  fNSigmaMass(0.),
  fUseImprovedVertex(kFALSE),
  fUseOwnXYZCalculation(kFALSE),
  fDoCF(kFALSE),
  fUseOnFlyV0Finder(kTRUE),
  fUpdateV0AlreadyCalled(kFALSE),
  fCurrentEventGoodV0s(NULL),
//  fPreviousEventGoodV0s(),
  fCalculateBackground(kFALSE),
  fBGEventHandler(NULL),
  fBGEventInitialized(kFALSE),
  fEsdTrackCuts(NULL),
  fNumberOfESDTracks(0)
{
  fESDpid = new AliESDpid;	
}


AliV0Reader::AliV0Reader(const AliV0Reader & original) :
  TObject(original),
  fMCStack(original.fMCStack),
  fMCTruth(original.fMCTruth),
  fMCEvent(original.fMCEvent),  // for CF
  fChain(original.fChain),
  fESDHandler(original.fESDHandler),
  fESDEvent(original.fESDEvent),
  fCFManager(original.fCFManager),
  fESDpid(original.fESDpid),
  fHistograms(original.fHistograms),
  fCurrentV0IndexNumber(original.fCurrentV0IndexNumber),
  fCurrentV0(original.fCurrentV0),
  fCurrentNegativeKFParticle(original.fCurrentNegativeKFParticle),
  fCurrentPositiveKFParticle(original.fCurrentPositiveKFParticle),
  fCurrentMotherKFCandidate(original.fCurrentMotherKFCandidate),
  fCurrentNegativeESDTrack(original.fCurrentNegativeESDTrack),
  fCurrentPositiveESDTrack(original.fCurrentPositiveESDTrack),
  fNegativeTrackLorentzVector(original.fNegativeTrackLorentzVector),
  fPositiveTrackLorentzVector(original.fPositiveTrackLorentzVector),
  fMotherCandidateLorentzVector(original.fMotherCandidateLorentzVector),
  fCurrentXValue(original.fCurrentXValue),
  fCurrentYValue(original.fCurrentYValue),
  fCurrentZValue(original.fCurrentZValue),
  fPositiveTrackPID(original.fPositiveTrackPID),
  fNegativeTrackPID(original.fNegativeTrackPID),
  fNegativeMCParticle(original.fNegativeMCParticle),
  fPositiveMCParticle(original.fPositiveMCParticle),
  fMotherMCParticle(original.fMotherMCParticle),
  fMotherCandidateKFMass(original.fMotherCandidateKFMass),
  fMotherCandidateKFWidth(original.fMotherCandidateKFWidth),
  fUseKFParticle(kTRUE),
  fUseESDTrack(kFALSE),
  fDoMC(kFALSE),
  fMaxR(original.fMaxR),
  fEtaCut(original.fEtaCut),
  fPtCut(original.fPtCut),
  fMaxZ(original.fMaxZ),
  fLineCutZRSlope(original.fLineCutZRSlope),
  fLineCutZValue(original.fLineCutZValue),
  fChi2CutConversion(original.fChi2CutConversion),
  fChi2CutMeson(original.fChi2CutMeson),
  fPIDProbabilityCutNegativeParticle(original.fPIDProbabilityCutNegativeParticle),
  fPIDProbabilityCutPositiveParticle(original.fPIDProbabilityCutPositiveParticle),
  fDodEdxSigmaCut(original.fDodEdxSigmaCut),
  fPIDnSigmaAboveElectronLine(original.fPIDnSigmaAboveElectronLine),
  fPIDnSigmaBelowElectronLine(original.fPIDnSigmaBelowElectronLine),
  fPIDnSigmaAbovePionLine(original.fPIDnSigmaAbovePionLine), 
  fPIDMinPnSigmaAbovePionLine(original.fPIDMinPnSigmaAbovePionLine), 
  fXVertexCut(original.fXVertexCut),
  fYVertexCut(original.fYVertexCut),
  fZVertexCut(original.fZVertexCut),
  fNSigmaMass(original.fNSigmaMass),
  fUseImprovedVertex(original.fUseImprovedVertex),
  fUseOwnXYZCalculation(original.fUseOwnXYZCalculation),
  fDoCF(original.fDoCF),
  fUseOnFlyV0Finder(original.fUseOnFlyV0Finder),
  fUpdateV0AlreadyCalled(original.fUpdateV0AlreadyCalled),
  fCurrentEventGoodV0s(original.fCurrentEventGoodV0s),
  //  fPreviousEventGoodV0s(original.fPreviousEventGoodV0s),
  fCalculateBackground(original.fCalculateBackground),
  fBGEventHandler(original.fBGEventHandler),
  fBGEventInitialized(original.fBGEventInitialized),
  fEsdTrackCuts(original.fEsdTrackCuts),
  fNumberOfESDTracks(original.fNumberOfESDTracks)
{
	
}


AliV0Reader & AliV0Reader::operator = (const AliV0Reader & /*source*/)
{
  // assignment operator
  return *this;
}
AliV0Reader::~AliV0Reader()
{
  if(fESDpid){
    delete fESDpid;
  }
}

void AliV0Reader::Initialize(){
  //see header file for documentation

  fUpdateV0AlreadyCalled = kFALSE;	
  // Get the input handler from the manager
  fESDHandler = (AliESDInputHandler*)(AliAnalysisManager::GetAnalysisManager()->GetInputEventHandler());
  if(fESDHandler == NULL){
    //print warning here
  }
	
  // Get pointer to esd event from input handler
  fESDEvent = fESDHandler->GetEvent();
  if(fESDEvent == NULL){
    //print warning here
  }
	
  //Get pointer to MCTruth
  fMCTruth = (AliMCEventHandler*)((AliAnalysisManager::GetAnalysisManager())->GetMCtruthEventHandler());
  if(fMCTruth == NULL){
    //print warning here
    fDoMC = kFALSE;
  }
	
  //Get pointer to the mc stack
  if(fMCTruth){
    fMCStack = fMCTruth->MCEvent()->Stack();
    if(fMCStack == NULL){
      //print warning here
    }
    // Better parameters for MonteCarlo from A. Kalweit 2010/01/8
    fESDpid->GetTPCResponse().SetBetheBlochParameters( 2.15898e+00/50.,
				      1.75295e+01,
				      3.40030e-09,
				      1.96178e+00,
				      3.91720e+00);
  }
  else{
    // Better parameters for data from A. Kalweit 2010/01/8
    fESDpid->GetTPCResponse().SetBetheBlochParameters(0.0283086,
				     2.63394e+01,
				     5.04114e-11,
				     2.12543e+00,
				     4.88663e+00);
  }
	
  // for CF
  //Get pointer to the mc event
  if(fDoCF && fDoMC){
    fMCEvent = fMCTruth->MCEvent();
    if(fMCEvent == NULL){
      //print warning here
      fDoCF = kFALSE;
    }	
  }
	
  AliKFParticle::SetField(fESDEvent->GetMagneticField());

  //  fCurrentEventGoodV0s = new TClonesArray("TClonesArray", 0);
  fCurrentEventGoodV0s = new TClonesArray("AliKFParticle", 0);

  if(fCalculateBackground == kTRUE){
    if(fBGEventInitialized == kFALSE){

      
      Double_t *zBinLimitsArray = new Double_t[8];
      zBinLimitsArray[0] = -50.00;
      zBinLimitsArray[1] = -4.07;
      zBinLimitsArray[2] = -2.17;
      zBinLimitsArray[3] = -0.69;
      zBinLimitsArray[4] = 0.69;
      zBinLimitsArray[5] = 2.17;
      zBinLimitsArray[6] = 4.11;
      zBinLimitsArray[7] = 50.00;
      
      Double_t *multiplicityBinLimitsArray= new Double_t[5];
      multiplicityBinLimitsArray[0] = 0;
      multiplicityBinLimitsArray[1] = 8.5;
      multiplicityBinLimitsArray[2] = 16.5;
      multiplicityBinLimitsArray[3] = 27.5;
      multiplicityBinLimitsArray[4] = 41.5;
            
      fBGEventHandler = new AliGammaConversionBGHandler(8,4,10);
      
      /*
      // ---------------------------------
      Double_t *zBinLimitsArray = new Double_t[1];
      zBinLimitsArray[0] = 999999.00;

      Double_t *multiplicityBinLimitsArray= new Double_t[1];
      multiplicityBinLimitsArray[0] = 99999999.00;
      fBGEventHandler = new AliGammaConversionBGHandler(1,1,10);
      // ---------------------------------
      */
      fBGEventHandler->Initialize(zBinLimitsArray, multiplicityBinLimitsArray);
      fBGEventInitialized = kTRUE;
    }
  }
}

AliESDv0* AliV0Reader::GetV0(Int_t index){
  //see header file for documentation
  fCurrentV0 = fESDEvent->GetV0(index);
  UpdateV0Information();
  return fCurrentV0;
}

Bool_t AliV0Reader::CheckForPrimaryVertex(){
  //see headerfile for documentation
  return fESDEvent->GetPrimaryVertex()->GetNContributors()>0;
}


Bool_t AliV0Reader::CheckV0FinderStatus(Int_t index){
  // see headerfile for documentation
  if(fUseOnFlyV0Finder){
    if(!GetV0(index)->GetOnFlyStatus()){
      return kFALSE;
    }
  }
  if(!fUseOnFlyV0Finder){
    if(GetV0(index)->GetOnFlyStatus()){
      return kFALSE;
    }
  }
  return kTRUE;
}



Bool_t AliV0Reader::NextV0(){
  //see header file for documentation

  Bool_t iResult=kFALSE;
  while(fCurrentV0IndexNumber<fESDEvent->GetNumberOfV0s()){
    fCurrentV0 = fESDEvent->GetV0(fCurrentV0IndexNumber);

    fUpdateV0AlreadyCalled=kFALSE;

    if(fHistograms != NULL){
      fHistograms->FillHistogram("ESD_AllV0s_InvMass",GetMotherCandidateMass());
    }
		
    // moved it up here so that the correction framework can access pt and eta information
    if(UpdateV0Information() == kFALSE){
      fCurrentV0IndexNumber++;
      continue;
    }
 
    Double_t containerInput[3];
    if(fDoCF){
      containerInput[0] = GetMotherCandidatePt();
      containerInput[1] = GetMotherCandidateEta();
      containerInput[2] = GetMotherCandidateMass();
    }
    
   
    //checks if on the fly mode is set
    if ( !CheckV0FinderStatus(fCurrentV0IndexNumber) ){
      if(fHistograms != NULL){
	fHistograms->FillHistogram("ESD_CutGetOnFly_InvMass",GetMotherCandidateMass());
      }
      fCurrentV0IndexNumber++;
      continue;
    }
    if(fDoCF){
      fCFManager->GetParticleContainer()->Fill(containerInput,kStepGetOnFly);		// for CF	
    }
    
    //checks if we have a prim vertex
    if(fESDEvent->GetPrimaryVertex()->GetNContributors()<=0) { 
      if(fHistograms != NULL){
	fHistograms->FillHistogram("ESD_CutNContributors_InvMass",GetMotherCandidateMass());
      }
      fCurrentV0IndexNumber++;
      continue;
    }
    if(fDoCF){
      fCFManager->GetParticleContainer()->Fill(containerInput,kStepNContributors);		// for CF	
    }
		
    //Check the pid probability
    if(CheckPIDProbability(fPIDProbabilityCutNegativeParticle,fPIDProbabilityCutPositiveParticle)==kFALSE){
      if(fHistograms != NULL){
	fHistograms->FillHistogram("ESD_CutPIDProb_InvMass",GetMotherCandidateMass());
      }
      fCurrentV0IndexNumber++;
      continue;
    }
    if(fDoCF){
      fCFManager->GetParticleContainer()->Fill(containerInput,kStepTPCPID);			// for CF
    }
		
    if(GetXYRadius()>fMaxR){ // cuts on distance from collision point
      if(fHistograms != NULL){
	fHistograms->FillHistogram("ESD_CutR_InvMass",GetMotherCandidateMass());
      }
      fCurrentV0IndexNumber++;
      continue;
    }	
    if(fDoCF){
      fCFManager->GetParticleContainer()->Fill(containerInput,kStepR);			// for CF
    }
		
		
    if((TMath::Abs(fCurrentZValue)*fLineCutZRSlope)-fLineCutZValue > GetXYRadius() ){ // cuts out regions where we do not reconstruct
      if(fHistograms != NULL){
	fHistograms->FillHistogram("ESD_CutLine_InvMass",GetMotherCandidateMass());
      }
      fCurrentV0IndexNumber++;
      continue;
    }
    if(fDoCF){
      fCFManager->GetParticleContainer()->Fill(containerInput,kStepLine);			// for CF
    }
		
    if(TMath::Abs(fCurrentZValue) > fMaxZ ){ // cuts out regions where we do not reconstruct
      if(fHistograms != NULL){
	fHistograms->FillHistogram("ESD_CutZ_InvMass",GetMotherCandidateMass());
      }
      fCurrentV0IndexNumber++;
      continue;
    }
    if(fDoCF){
      fCFManager->GetParticleContainer()->Fill(containerInput,kStepZ);		// for CF	
    }
		
    /* Moved further up so corr framework can work
       if(UpdateV0Information() == kFALSE){
       fCurrentV0IndexNumber++;
       continue;
       }
    */

		
    if(fUseKFParticle){
      if(fCurrentMotherKFCandidate->GetNDF()<=0){
	if(fHistograms != NULL){
	  fHistograms->FillHistogram("ESD_CutNDF_InvMass",GetMotherCandidateMass());
	}
	fCurrentV0IndexNumber++;
	continue;
      }
      if(fDoCF){
	fCFManager->GetParticleContainer()->Fill(containerInput,kStepNDF);		// for CF	
      }
			
      Double_t chi2V0 = fCurrentMotherKFCandidate->GetChi2()/fCurrentMotherKFCandidate->GetNDF();
      if(chi2V0 > fChi2CutConversion || chi2V0 <=0){
	if(fHistograms != NULL){
	  fHistograms->FillHistogram("ESD_CutChi2_InvMass",GetMotherCandidateMass());
	}
	fCurrentV0IndexNumber++;
	continue;
      }
      if(fDoCF){
	fCFManager->GetParticleContainer()->Fill(containerInput,kStepChi2);			// for CF
      }
			
      if(TMath::Abs(fMotherCandidateLorentzVector->Eta())> fEtaCut){
	if(fHistograms != NULL){
	  fHistograms->FillHistogram("ESD_CutEta_InvMass",GetMotherCandidateMass());
	}
	fCurrentV0IndexNumber++;
	continue;
      }
      if(fDoCF){
	fCFManager->GetParticleContainer()->Fill(containerInput,kStepEta);			// for CF
      }
			
      if(fMotherCandidateLorentzVector->Pt()<fPtCut){
	if(fHistograms != NULL){
	  fHistograms->FillHistogram("ESD_CutPt_InvMass",GetMotherCandidateMass());
	}
	fCurrentV0IndexNumber++;
	continue;
      }
      if(fDoCF){
	fCFManager->GetParticleContainer()->Fill(containerInput,kStepPt);			// for CF
      }
			
    }
    else if(fUseESDTrack){
      //TODO
    }

    if(fHistograms != NULL){
      fHistograms->FillHistogram("ESD_GoodV0s_InvMass",GetMotherCandidateMass());
    }

    //    fCurrentEventGoodV0s.push_back(*fCurrentMotherKFCandidate);

    new((*fCurrentEventGoodV0s)[fCurrentEventGoodV0s->GetEntriesFast()])  AliKFParticle(*fCurrentMotherKFCandidate);

    iResult=kTRUE;//means we have a v0 who survived all the cuts applied
		
    fCurrentV0IndexNumber++;
		
    break;
  }
  return iResult; 
}

Bool_t AliV0Reader::UpdateV0Information(){
  //see header file for documentation
	
  Bool_t iResult=kTRUE;		 				// for taking out not refitted, kinks and like sign tracks 
	
  Bool_t switchTracks = kFALSE;
	
  fCurrentNegativeESDTrack = fESDEvent->GetTrack(fCurrentV0->GetNindex());
  fCurrentPositiveESDTrack = fESDEvent->GetTrack(fCurrentV0->GetPindex());
	
  if(fCurrentNegativeESDTrack->GetSign() == fCurrentPositiveESDTrack->GetSign()){             // avoid like sign
    iResult=kFALSE;
    if(fHistograms != NULL && fUpdateV0AlreadyCalled == kFALSE){
      fHistograms->FillHistogram("ESD_CutLikeSign_InvMass",GetMotherCandidateMass());
      // to avoid filling the other cut histograms. So in this case fUpdateV0AlreadyCalled also serves as a flag for the histogram filling
      // it will anyway be set to true at the end of the UpdateV0Information function, and there are no return until the end
      fUpdateV0AlreadyCalled == kTRUE;
    }
  }
	
  if(fCurrentPositiveESDTrack->GetSign() == -1 && fCurrentNegativeESDTrack->GetSign() == 1){  // switch wrong signed tracks
    fCurrentNegativeESDTrack = fESDEvent->GetTrack(fCurrentV0->GetPindex());
    fCurrentPositiveESDTrack = fESDEvent->GetTrack(fCurrentV0->GetNindex());
    switchTracks = kTRUE;
  }
	
  if( !(fCurrentNegativeESDTrack->GetStatus() & AliESDtrack::kTPCrefit) || 
      !(fCurrentPositiveESDTrack->GetStatus() & AliESDtrack::kTPCrefit) ){
    //  if( !(fCurrentNegativeESDTrack->GetStatus() & AliESDtrack::kITSrefit) || 
    //      !(fCurrentPositiveESDTrack->GetStatus() & AliESDtrack::kITSrefit) ){
    iResult=kFALSE;
    if(fHistograms != NULL && fUpdateV0AlreadyCalled == kFALSE){
      fHistograms->FillHistogram("ESD_CutRefit_InvMass",GetMotherCandidateMass());
      // to avoid filling the other cut histograms. So in this case fUpdateV0AlreadyCalled also serves as a flag for the histogram filling
      // it will anyway be set to true at the end of the UpdateV0Information function, and there are no return until the end
      fUpdateV0AlreadyCalled == kTRUE;
    }
  }
	
  if( fCurrentNegativeESDTrack->GetKinkIndex(0) > 0 || 
      fCurrentPositiveESDTrack->GetKinkIndex(0) > 0) {			
		
    iResult=kFALSE;
    if(fHistograms != NULL && fUpdateV0AlreadyCalled == kFALSE){
      fHistograms->FillHistogram("ESD_CutKink_InvMass",GetMotherCandidateMass());
      // to avoid filling the other cut histograms. So in this case fUpdateV0AlreadyCalled also serves as a flag for the histogram filling
      // it will anyway be set to true at the end of the UpdateV0Information function, and there are no return until the end
      fUpdateV0AlreadyCalled == kTRUE;
    }
  }

  if(fDodEdxSigmaCut == kTRUE){

    if( fESDpid->NumberOfSigmasTPC(fCurrentPositiveESDTrack,AliPID::kElectron)<fPIDnSigmaBelowElectronLine ||
	fESDpid->NumberOfSigmasTPC(fCurrentPositiveESDTrack,AliPID::kElectron)>fPIDnSigmaAboveElectronLine ||
	fESDpid->NumberOfSigmasTPC(fCurrentNegativeESDTrack,AliPID::kElectron)<fPIDnSigmaBelowElectronLine ||
	fESDpid->NumberOfSigmasTPC(fCurrentNegativeESDTrack,AliPID::kElectron)>fPIDnSigmaAboveElectronLine ){
      iResult=kFALSE;
      if(fHistograms != NULL && fUpdateV0AlreadyCalled == kFALSE){
	fHistograms->FillHistogram("ESD_CutdEdxSigmaElectronLine_InvMass",GetMotherCandidateMass());
	// to avoid filling the other cut histograms. So in this case fUpdateV0AlreadyCalled also serves as a flag for the histogram filling
	// it will anyway be set to true at the end of the UpdateV0Information function, and there are no return until the end
	fUpdateV0AlreadyCalled == kTRUE;
      }
    }
    if( fCurrentPositiveESDTrack->P()>fPIDMinPnSigmaAbovePionLine){
      if(fESDpid->NumberOfSigmasTPC(fCurrentPositiveESDTrack,AliPID::kElectron)>fPIDnSigmaBelowElectronLine &&
	 fESDpid->NumberOfSigmasTPC(fCurrentPositiveESDTrack,AliPID::kElectron)<fPIDnSigmaAboveElectronLine&&
	 fESDpid->NumberOfSigmasTPC(fCurrentPositiveESDTrack,AliPID::kPion)<fPIDnSigmaAbovePionLine){
	iResult=kFALSE;
	if(fHistograms != NULL && fUpdateV0AlreadyCalled == kFALSE){
	  fHistograms->FillHistogram("ESD_CutdEdxSigmaPionLine_InvMass",GetMotherCandidateMass());
	  // to avoid filling the other cut histograms. So in this case fUpdateV0AlreadyCalled also serves as a flag for the histogram filling
	  // it will anyway be set to true at the end of the UpdateV0Information function, and there are no return until the end
	  fUpdateV0AlreadyCalled == kTRUE;
	}
      }
    }

    if( fCurrentNegativeESDTrack->P()>fPIDMinPnSigmaAbovePionLine){
      if(fESDpid->NumberOfSigmasTPC(fCurrentNegativeESDTrack,AliPID::kElectron)>fPIDnSigmaBelowElectronLine &&
	 fESDpid->NumberOfSigmasTPC(fCurrentNegativeESDTrack,AliPID::kElectron)<fPIDnSigmaAboveElectronLine&&
	 fESDpid->NumberOfSigmasTPC(fCurrentNegativeESDTrack,AliPID::kPion)<fPIDnSigmaAbovePionLine){
	iResult=kFALSE;
	if(fHistograms != NULL && fUpdateV0AlreadyCalled == kFALSE){
	  fHistograms->FillHistogram("ESD_CutdEdxSigmaPionLine_InvMass",GetMotherCandidateMass());
	  // to avoid filling the other cut histograms. So in this case fUpdateV0AlreadyCalled also serves as a flag for the histogram filling
	  // it will anyway be set to true at the end of the UpdateV0Information function, and there are no return until the end
	  fUpdateV0AlreadyCalled == kTRUE;
	}
      }
    }
  }
	
  if(fCurrentNegativeKFParticle != NULL){
    delete fCurrentNegativeKFParticle;
  }
  if(switchTracks == kFALSE){
    fCurrentNegativeKFParticle = new AliKFParticle(*(fCurrentV0->GetParamN()),fNegativeTrackPID);
  }
  else{
    fCurrentNegativeKFParticle = new AliKFParticle(*(fCurrentV0->GetParamP()),fNegativeTrackPID);
  }
	
  if(fCurrentPositiveKFParticle != NULL){
    delete fCurrentPositiveKFParticle;
  }
  if(switchTracks == kFALSE){
    fCurrentPositiveKFParticle = new AliKFParticle(*(fCurrentV0->GetParamP()),fPositiveTrackPID);
  }
  else{
    fCurrentPositiveKFParticle = new AliKFParticle(*(fCurrentV0->GetParamN()),fPositiveTrackPID);
  }
    
  if(fCurrentMotherKFCandidate != NULL){
    delete fCurrentMotherKFCandidate;
  }
  fCurrentMotherKFCandidate = new AliKFParticle(*fCurrentNegativeKFParticle,*fCurrentPositiveKFParticle);
	
	
  if(fPositiveTrackPID==-11 && fNegativeTrackPID==11){
    fCurrentMotherKFCandidate->SetMassConstraint(0,fNSigmaMass);
  }
	
  if(fUseImprovedVertex == kTRUE){
    AliKFVertex primaryVertexImproved(*GetPrimaryVertex());
    primaryVertexImproved+=*fCurrentMotherKFCandidate;
    fCurrentMotherKFCandidate->SetProductionVertex(primaryVertexImproved);
  }
	
  fCurrentMotherKFCandidate->GetMass(fMotherCandidateKFMass,fMotherCandidateKFWidth);
	
	
  if(fNegativeTrackLorentzVector != NULL){
    delete fNegativeTrackLorentzVector;
  }
  if(fUseKFParticle){
    fNegativeTrackLorentzVector = new TLorentzVector(fCurrentNegativeKFParticle->Px(),fCurrentNegativeKFParticle->Py(),fCurrentNegativeKFParticle->Pz());
  }
  else if(fUseESDTrack){
    fNegativeTrackLorentzVector = new TLorentzVector(fCurrentNegativeESDTrack->Px(),fCurrentNegativeESDTrack->Py(),fCurrentNegativeESDTrack->Pz());
  }
	
  if(fPositiveTrackLorentzVector != NULL){
    delete fPositiveTrackLorentzVector;
  }
  if(fUseKFParticle){
    fPositiveTrackLorentzVector = new TLorentzVector(fCurrentPositiveKFParticle->Px(),fCurrentPositiveKFParticle->Py(),fCurrentPositiveKFParticle->Pz());
  }
  else if(fUseESDTrack){
    fPositiveTrackLorentzVector = new TLorentzVector(fCurrentPositiveESDTrack->Px(),fCurrentPositiveESDTrack->Py(),fCurrentPositiveESDTrack->Pz());
  }
	
  if(fMotherCandidateLorentzVector != NULL){
    delete fMotherCandidateLorentzVector;
  }
  if(fUseKFParticle){
    fMotherCandidateLorentzVector = new TLorentzVector(*fNegativeTrackLorentzVector + *fPositiveTrackLorentzVector);
  }
  else if(fUseESDTrack){
    fMotherCandidateLorentzVector = new TLorentzVector(*fNegativeTrackLorentzVector + *fPositiveTrackLorentzVector);
  }
	
  if(fPositiveTrackPID==-11 && fNegativeTrackPID==11){
    fMotherCandidateLorentzVector->SetXYZM(fMotherCandidateLorentzVector->Px() ,fMotherCandidateLorentzVector->Py(),fMotherCandidateLorentzVector->Pz(),0.); 
  }
    
	
  if(fDoMC == kTRUE){
    fMotherMCParticle= NULL;
    fNegativeMCParticle = fMCStack->Particle(TMath::Abs(fESDEvent->GetTrack(fCurrentV0->GetNindex())->GetLabel()));
    fPositiveMCParticle = fMCStack->Particle(TMath::Abs(fESDEvent->GetTrack(fCurrentV0->GetPindex())->GetLabel()));
    if(fPositiveMCParticle->GetMother(0)>-1){
      fMotherMCParticle = fMCStack->Particle(fPositiveMCParticle->GetMother(0));
    }
  }
	

  // for CF
  Double_t containerInput[3];
  if(fDoCF){
    containerInput[0] = GetMotherCandidatePt();
    containerInput[1] = GetMotherCandidateEta();
    containerInput[2] = GetMotherCandidateMass();
    
    fCFManager->GetParticleContainer()->Fill(containerInput,kStepLikeSign);		// for CF	
    fCFManager->GetParticleContainer()->Fill(containerInput,kStepTPCRefit);		// for CF	
    fCFManager->GetParticleContainer()->Fill(containerInput,kStepKinks);		// for CF	
  }
  

  if(fUseOwnXYZCalculation == kFALSE){
    fCurrentV0->GetXYZ(fCurrentXValue,fCurrentYValue,fCurrentZValue);
  }
  else{
    Double_t convpos[2];
    convpos[0]=0;
    convpos[1]=0;
    GetConvPosXY(GetPositiveESDTrack(),GetNegativeESDTrack(),GetMagneticField(),convpos);
    fCurrentXValue = convpos[0];
    fCurrentYValue = convpos[1];
    fCurrentZValue = GetConvPosZ(GetPositiveESDTrack(),GetNegativeESDTrack(),GetMagneticField());
  }


  fUpdateV0AlreadyCalled = kTRUE;

  return iResult;
}



Bool_t AliV0Reader::HasSameMCMother(){
  //see header file for documentation
	
  Bool_t iResult = kFALSE;
  if(fDoMC == kTRUE){
    if(fNegativeMCParticle != NULL && fPositiveMCParticle != NULL){
      if(fNegativeMCParticle->GetMother(0) == fPositiveMCParticle->GetMother(0))
	if(fMotherMCParticle){
	  iResult = kTRUE;
	}
    }
  }
  return iResult;
}

Bool_t AliV0Reader::CheckPIDProbability(Double_t negProbCut, Double_t posProbCut){
  //see header file for documentation
	
  Bool_t iResult=kFALSE;
	
  Double_t *posProbArray = new Double_t[10];
  Double_t *negProbArray = new Double_t[10];
  AliESDtrack* negTrack  = fESDEvent->GetTrack(fCurrentV0->GetNindex());
  AliESDtrack* posTrack  = fESDEvent->GetTrack(fCurrentV0->GetPindex());
	
  negTrack->GetTPCpid(negProbArray);
  posTrack->GetTPCpid(posProbArray);
	
  //  if(negProbArray != NULL && posProbArray != NULL){ // this is not allowed anymore for some reason(RC19)
  if(negProbArray && posProbArray){
    if(negProbArray[GetSpeciesIndex(-1)]>=negProbCut && posProbArray[GetSpeciesIndex(1)]>=posProbCut){
      iResult=kTRUE;
    }
  }
  delete [] posProbArray;
  delete [] negProbArray;
  return iResult;
}

void AliV0Reader::GetPIDProbability(Double_t &negPIDProb,Double_t & posPIDProb){
  // see header file for documentation

  Double_t *posProbArray = new Double_t[10];
  Double_t *negProbArray = new Double_t[10];
  AliESDtrack* negTrack  = fESDEvent->GetTrack(fCurrentV0->GetNindex());
  AliESDtrack* posTrack  = fESDEvent->GetTrack(fCurrentV0->GetPindex());
	
  negTrack->GetTPCpid(negProbArray);
  posTrack->GetTPCpid(posProbArray);
	
  //  if(negProbArray!=NULL && posProbArray!=NULL){ // this is not allowed anymore for some reason(RC19)
  if(negProbArray && posProbArray){
    negPIDProb = negProbArray[GetSpeciesIndex(-1)];
    posPIDProb = posProbArray[GetSpeciesIndex(1)];
  }
  delete [] posProbArray;
  delete [] negProbArray;
}

void AliV0Reader::UpdateEventByEventData(){
  //see header file for documentation
  if(fCurrentEventGoodV0s->GetEntriesFast() >0 ){
    if(fCalculateBackground){
      fBGEventHandler->AddEvent(fCurrentEventGoodV0s,fESDEvent->GetPrimaryVertex()->GetZ(),CountESDTracks());
      //filling z and multiplicity histograms
      fHistograms->FillHistogram("ESD_Z_distribution",fESDEvent->GetPrimaryVertex()->GetZ());
      fHistograms->FillHistogram("ESD_multiplicity_distribution",CountESDTracks());
      fHistograms->FillHistogram("ESD_ZvsMultiplicity",fESDEvent->GetPrimaryVertex()->GetZ(),CountESDTracks());
    }
  }
  fCurrentEventGoodV0s->Delete();
  fCurrentV0IndexNumber=0;
  fNumberOfESDTracks=0;
  //  fBGEventHandler->PrintBGArray(); // for debugging
}


Double_t AliV0Reader::GetNegativeTrackPhi() const{
  //see header file for documentation
	
  Double_t offset=0;
  if(fNegativeTrackLorentzVector->Phi()> TMath::Pi()){
    offset = -2*TMath::Pi();
  }
  return fNegativeTrackLorentzVector->Phi()+offset;
}

Double_t AliV0Reader::GetPositiveTrackPhi() const{
  //see header file for documentation
	
  Double_t offset=0;
  if(fPositiveTrackLorentzVector->Phi()> TMath::Pi()){
    offset = -2*TMath::Pi();
  }
  return fPositiveTrackLorentzVector->Phi()+offset;
}

Double_t AliV0Reader::GetMotherCandidatePhi() const{
  //see header file for documentation
	
  Double_t offset=0;
  if(fMotherCandidateLorentzVector->Phi()> TMath::Pi()){
    offset = -2*TMath::Pi();
  }
  return fMotherCandidateLorentzVector->Phi()+offset;
}


Double_t AliV0Reader::GetMotherCandidateRapidity() const{
  //see header file for documentation
	
  Double_t rapidity=0;
  if(fMotherCandidateLorentzVector->Energy() - fMotherCandidateLorentzVector->Pz() == 0 || fMotherCandidateLorentzVector->Energy() + fMotherCandidateLorentzVector->Pz() == 0) rapidity=0;
  else rapidity = 0.5*(TMath::Log((fMotherCandidateLorentzVector->Energy() + fMotherCandidateLorentzVector->Pz()) / (fMotherCandidateLorentzVector->Energy()-fMotherCandidateLorentzVector->Pz())));
  return rapidity;
	
}





Int_t AliV0Reader::GetSpeciesIndex(Int_t chargeOfTrack){
  //see header file for documentation
	
  Int_t iResult = 10; // Unknown particle
	
  if(chargeOfTrack==-1){ //negative track
    switch(abs(fNegativeTrackPID)){
    case 11:       //electron
      iResult = 0;
      break;
    case 13:       //muon
      iResult = 1;
      break;
    case 211:      //pion
      iResult = 2;
      break;
    case 321:      //kaon
      iResult = 3;
      break;
    case 2212:     //proton
      iResult = 4;
      break;
    case 22:       //photon
      iResult = 5;
      break;
    case 111:      //pi0
      iResult = 6;
      break;
    case 2112:     //neutron
      iResult = 7;
      break;
    case 311:      //K0
      iResult = 8;
      break;
				
      //Put in here for kSPECIES::kEleCon  ????
    }
  }
  else if(chargeOfTrack==1){ //positive track
    switch(abs(fPositiveTrackPID)){
    case 11:       //electron
      iResult = 0;
      break;
    case 13:       //muon
      iResult = 1;
      break;
    case 211:      //pion
      iResult = 2;
      break;
    case 321:      //kaon
      iResult = 3;
      break;
    case 2212:     //proton
      iResult = 4;
      break;
    case 22:       //photon
      iResult = 5;
      break;
    case 111:      //pi0
      iResult = 6;
      break;
    case 2112:     //neutron
      iResult = 7;
      break;
    case 311:      //K0
      iResult = 8;
      break;
				
      //Put in here for kSPECIES::kEleCon  ????
    }
  }
  else{
    //Wrong parameter.. Print warning
  }
  return iResult;
}

Bool_t AliV0Reader::GetHelixCenter(AliESDtrack* track, Double_t b,Int_t charge, Double_t center[2]){
  // see header file for documentation
  
  Double_t pi = 3.14159265358979323846;
  
  Double_t  helix[6];
  track->GetHelixParameters(helix,b);
  
  Double_t xpos =  helix[5];
  Double_t ypos =  helix[0];
  Double_t radius = TMath::Abs(1./helix[4]);
  Double_t phi = helix[2];

  if(phi < 0){
    phi = phi + 2*pi;
  }

  phi -= pi/2.;
  Double_t xpoint =  radius * TMath::Cos(phi);
  Double_t ypoint =  radius * TMath::Sin(phi);

  if(charge > 0){
    xpoint = - xpoint;
    ypoint = - ypoint;
  }

  if(charge < 0){
    xpoint =  xpoint;
    ypoint =  ypoint;
  }
  center[0] =  xpos + xpoint;
  center[1] =  ypos + ypoint;

  return 1;
}

Bool_t AliV0Reader::GetConvPosXY(AliESDtrack* ptrack, AliESDtrack* ntrack, Double_t b, Double_t convpos[2]){
  //see header file for documentation

  Double_t helixcenterpos[2];
  GetHelixCenter(ptrack,b,ptrack->Charge(),helixcenterpos);

  Double_t helixcenterneg[2];
  GetHelixCenter(ntrack,b,ntrack->Charge(),helixcenterneg);

  Double_t  poshelix[6];
  ptrack->GetHelixParameters(poshelix,b);
  Double_t posradius = TMath::Abs(1./poshelix[4]);

  Double_t  neghelix[6];
  ntrack->GetHelixParameters(neghelix,b);
  Double_t negradius = TMath::Abs(1./neghelix[4]);

  Double_t xpos = helixcenterpos[0];
  Double_t ypos = helixcenterpos[1];
  Double_t xneg = helixcenterneg[0];
  Double_t yneg = helixcenterneg[1];

  convpos[0] = (xpos*negradius + xneg*posradius)/(negradius+posradius);
  convpos[1] = (ypos*negradius+  yneg*posradius)/(negradius+posradius);

  return 1;
}



Double_t AliV0Reader::GetConvPosZ(AliESDtrack* ptrack,AliESDtrack* ntrack, Double_t b){
  //see header file for documentation

  Double_t  helixpos[6];
  ptrack->GetHelixParameters(helixpos,b);

  Double_t  helixneg[6];
  ntrack->GetHelixParameters(helixneg,b);

  Double_t negtrackradius =  TMath::Abs(1./helixneg[4]);
  Double_t postrackradius =  TMath::Abs(1./helixpos[4]);

  Double_t pi = 3.14159265358979323846;

  Double_t convpos[2];
  GetConvPosXY(ptrack,ntrack,b,convpos);

   Double_t convposx = convpos[0];
   Double_t convposy = convpos[1];

   Double_t helixcenterpos[2];
   GetHelixCenter(ptrack,b,ptrack->Charge(),helixcenterpos);

   Double_t helixcenterneg[2];
   GetHelixCenter(ntrack,b,ntrack->Charge(),helixcenterneg);

   Double_t xpos = helixcenterpos[0];
   Double_t ypos = helixcenterpos[1];
   Double_t xneg = helixcenterneg[0];
   Double_t yneg = helixcenterneg[1];

   Double_t deltaXPos = convposx -  xpos;
   Double_t deltaYPos = convposy -  ypos;

   Double_t deltaXNeg = convposx -  xneg;
   Double_t deltaYNeg = convposy -  yneg;

   Double_t alphaPos =  pi + TMath::ATan2(-deltaYPos,-deltaXPos);
   Double_t alphaNeg =  pi + TMath::ATan2(-deltaYNeg,-deltaXNeg);

   Double_t vertexXNeg =  xneg +  TMath::Abs(negtrackradius)*
   TMath::Cos(alphaNeg);
   Double_t vertexYNeg =  yneg +  TMath::Abs(negtrackradius)*
   TMath::Sin(alphaNeg);

   Double_t vertexXPos =  xpos +  TMath::Abs(postrackradius)*
   TMath::Cos(alphaPos);
   Double_t vertexYPos =  ypos +  TMath::Abs(postrackradius)*
   TMath::Sin(alphaPos);

   Double_t x0neg =   helixneg[5];
   Double_t y0neg =   helixneg[0];

   Double_t x0pos =   helixpos[5];
   Double_t y0pos =   helixpos[0];

   Double_t dNeg = TMath::Sqrt((vertexXNeg -  x0neg)*(vertexXNeg - x0neg)
                               +(vertexYNeg -  y0neg)*(vertexYNeg - y0neg));

   Double_t dPos = TMath::Sqrt((vertexXPos -  x0pos)*(vertexXPos - x0pos)
                               +(vertexYPos -  y0pos)*(vertexYPos - y0pos));

   Double_t rNeg =  TMath::Sqrt(negtrackradius*negtrackradius -
   dNeg*dNeg/4.);

   Double_t rPos = TMath::Sqrt(postrackradius*postrackradius -
   dPos*dPos/4.);

   Double_t deltabetaNeg =  2*(pi +   TMath::ATan2(-dNeg/2.,-rNeg));
   Double_t deltabetaPos = 2*(pi + TMath::ATan2(-dPos/2.,-rPos));

   Double_t deltaUNeg = negtrackradius*deltabetaNeg;
   Double_t deltaUPos = postrackradius*deltabetaPos;

   Double_t zphaseNeg = ntrack->GetZ() +  deltaUNeg * ntrack->GetTgl();
   Double_t zphasePos = ptrack->GetZ() +  deltaUPos * ptrack->GetTgl();

   Double_t convposz = (zphasePos*negtrackradius+zphaseNeg*postrackradius)/(negtrackradius+postrackradius);

   return convposz;
}

AliGammaConversionKFVector* AliV0Reader::GetBGGoodV0s(Int_t event){

  return fBGEventHandler->GetBGGoodV0s(event,fESDEvent->GetPrimaryVertex()->GetZ(),CountESDTracks());
}

Int_t AliV0Reader::CountESDTracks(){
  // see header file for documentation
  if(fNumberOfESDTracks == 0){ // count the good esd tracks
    for(Int_t iTracks = 0; iTracks < fESDEvent->GetNumberOfTracks(); iTracks++){
      AliESDtrack* curTrack = fESDEvent->GetTrack(iTracks);      
      if(!curTrack){
	continue;
      }
      if(fEsdTrackCuts->AcceptTrack(curTrack) ){
	fNumberOfESDTracks++;
      }
    }
  }

  return fNumberOfESDTracks;
}

Bool_t AliV0Reader::CheckIfPi0IsMother(Int_t label){
  // see headerfile for documentation
  Bool_t iResult=kFALSE;
  //  cout<<"Checking particle label, particle is: "<<fMCStack->Particle(TMath::Abs(label))->GetName()<<endl;
  if(fMCStack->Particle(TMath::Abs(label))->GetPdgCode() == 111){
    iResult=kTRUE;
  }
  return iResult;
}