[u/mrichter/AliRoot.git] / PWGDQ / dielectron / AliDielectronPID.cxx

/*************************************************************************
* Copyright(c) 1998-2009, ALICE Experiment at CERN, All rights reserved. *
*                                                                        *
* Author: The ALICE Off-line Project.                                    *
* Contributors are mentioned in the code where appropriate.              *
*                                                                        *
* 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.                  *
**************************************************************************/

///////////////////////////////////////////////////////////////////////////
//                Dielectron PID                                  //
//                                                                       //
//                                                                       //
/*
Detailed description


*/
//                                                                       //
///////////////////////////////////////////////////////////////////////////

#include <TMath.h>
#include <TF1.h>
#include <TGraph.h>

#include <AliVTrack.h>
#include <AliVCluster.h>
#include <AliLog.h>
#include <AliExternalTrackParam.h>
#include <AliPIDResponse.h>
#include <AliESDtrack.h> //!!!!! Remove once Eta correction is treated in the tender

#include "AliDielectronVarManager.h"

#include "AliDielectronPID.h"

ClassImp(AliDielectronPID)

TGraph *AliDielectronPID::fgFitCorr=0x0;
Double_t AliDielectronPID::fgCorr=0.0;
TF1 *AliDielectronPID::fgFunEtaCorr=0x0;

AliDielectronPID::AliDielectronPID() :
  AliAnalysisCuts(),
  fNcuts(0),
  fPIDResponse(0x0)
{
  //
  // Default Constructor
  //
  for (Int_t icut=0; icut<kNmaxPID; ++icut){
    fDetType[icut]=kTPC;
    fPartType[icut]=AliPID::kPion;
    fNsigmaLow[icut]=0;
    fNsigmaUp[icut]=0;
    fmin[icut]=0;
    fmax[icut]=0;
    fExclude[icut]=kFALSE;
    fFunUpperCut[icut]=0x0;
    fFunLowerCut[icut]=0x0;
    fRequirePIDbit[icut]=0;
    fActiveCuts[icut]=-1;
  }
}

//______________________________________________
AliDielectronPID::AliDielectronPID(const char* name, const char* title) :
  AliAnalysisCuts(name, title),
  fNcuts(0),
  fPIDResponse(0x0)
{
  //
  // Named Constructor
  //
  for (Int_t icut=0; icut<kNmaxPID; ++icut){
    fDetType[icut]=kTPC;
    fPartType[icut]=AliPID::kPion;
    fNsigmaLow[icut]=0;
    fNsigmaUp[icut]=0;
    fmin[icut]=0;
    fmax[icut]=0;
    fExclude[icut]=kFALSE;
    fFunUpperCut[icut]=0x0;
    fFunLowerCut[icut]=0x0;
    fRequirePIDbit[icut]=0;
    fActiveCuts[icut]=0;
  }
}

//______________________________________________
AliDielectronPID::~AliDielectronPID()
{
  //
  // Default Destructor
  //
}

//______________________________________________
void AliDielectronPID::AddCut(DetType det, AliPID::EParticleType type, Double_t nSigmaLow, Double_t nSigmaUp/*=-99999.*/,
                              Double_t min/*=0*/, Double_t max/*=0*/, Bool_t exclude/*=kFALSE*/,
                              UInt_t pidBitType/*=AliDielectronPID::kRequire*/, Int_t var/*=-1*/)
{
  //
  // Add a pid nsigma cut
  // use response of detector 'det' in the range ['min'] to ['max'] for var
  // use a sigma band between 'nSigmaLow' and 'nSigmaUp'
  // if nSigmaUp==-99999. then nSigmaLow will be uesd as a symmetric band +- nSigmaLow
  // specify whether to 'exclude' the given band
  //

  if (fNcuts>=kNmaxPID){
    AliError(Form("only %d pid cut ranges allowed",kNmaxPID));
    return;
  }
  if (TMath::Abs(nSigmaUp+99999.)<1e-20){
    nSigmaUp=TMath::Abs(nSigmaLow);
    nSigmaLow=-1.*nSigmaUp;
  }
  fDetType[fNcuts]=det;
  fPartType[fNcuts]=type;
  fNsigmaLow[fNcuts]=nSigmaLow;
  fNsigmaUp[fNcuts]=nSigmaUp;
  fmin[fNcuts]=min;
  fmax[fNcuts]=max;
  fExclude[fNcuts]=exclude;
  fRequirePIDbit[fNcuts]=pidBitType;
  fActiveCuts[fNcuts]=(var==-1 ? AliDielectronVarManager::kP : var);

  AliInfo(Form("Add PID cut %d: sigma [% .1f,% .1f] \t cut [% .1f,% .f] \t var %d->%s \n",
	       fNcuts,nSigmaLow,nSigmaUp,min,max,fActiveCuts[fNcuts],AliDielectronVarManager::GetValueName(fActiveCuts[fNcuts])));  
  
  ++fNcuts;

}

//______________________________________________
void AliDielectronPID::AddCut(DetType det, AliPID::EParticleType type, Double_t nSigmaLow, TF1 * const funUp,
                              Double_t min/*=0*/, Double_t max/*=0*/, Bool_t exclude/*=kFALSE*/,
                              UInt_t pidBitType/*=AliDielectronPID::kRequire*/, Int_t var/*=-1*/)
{
  //
  // cut using a TF1 as upper cut
  //
  if (funUp==0x0){
    AliError("A valid function is required for the upper cut. Not adding the cut!");
    return;
  }
  fFunUpperCut[fNcuts]=funUp;
  AddCut(det,type,nSigmaLow,0.,min,max,exclude,pidBitType,var);
}

//______________________________________________
void AliDielectronPID::AddCut(DetType det, AliPID::EParticleType type, TF1 * const funLow, Double_t nSigmaUp,
                              Double_t min/*=0*/, Double_t max/*=0*/, Bool_t exclude/*=kFALSE*/,
                              UInt_t pidBitType/*=AliDielectronPID::kRequire*/, Int_t var/*=-1*/)
{
  //
  // cut using a TF1 as lower cut
  //
  if (funLow==0x0){
    AliError("A valid function is required for the lower cut. Not adding the cut!");
    return;
  }
  fFunLowerCut[fNcuts]=funLow;
  AddCut(det,type,0.,nSigmaUp,min,max,exclude,pidBitType,var);
}

//______________________________________________
void AliDielectronPID::AddCut(DetType det, AliPID::EParticleType type, TF1 * const funLow, TF1 * const funUp,
                              Double_t min/*=0*/, Double_t max/*=0*/, Bool_t exclude/*=kFALSE*/,
                              UInt_t pidBitType/*=AliDielectronPID::kRequire*/, Int_t var/*=-1*/)
{
  //
  // cut using a TF1 as lower and upper cut
  //
  if ( (funUp==0x0) || (funLow==0x0) ){
    AliError("A valid function is required for upper and lower cut. Not adding the cut!");
    return;
  }
  fFunUpperCut[fNcuts]=funUp;
  fFunLowerCut[fNcuts]=funLow;
  AddCut(det,type,0.,0.,min,max,exclude,pidBitType,var);
}

//______________________________________________
Bool_t AliDielectronPID::IsSelected(TObject* track)
{
  //
  // perform PID cuts
  //

  //loop over all cuts
  AliVTrack *part=static_cast<AliVTrack*>(track);
  AliESDtrack *esdTrack=0x0;
  Double_t origdEdx=-1;
  
  // apply ETa correction, remove once this is in the tender
  if( (part->IsA() == AliESDtrack::Class()) && fgFunEtaCorr ){
    esdTrack=static_cast<AliESDtrack*>(part);
    origdEdx=esdTrack->GetTPCsignal();
    esdTrack->SetTPCsignal(origdEdx/GetEtaCorr(esdTrack),esdTrack->GetTPCsignalSigma(),esdTrack->GetTPCsignalN());
  }

  
  //Fill values
  Double_t values[AliDielectronVarManager::kNMaxValues];
  AliDielectronVarManager::Fill(track,values);

  Bool_t selected=kFALSE;
  fPIDResponse=AliDielectronVarManager::GetPIDResponse();
  for (UChar_t icut=0; icut<fNcuts; ++icut){
    Double_t min=fmin[icut];
    Double_t max=fmax[icut];
    Double_t val=values[fActiveCuts[icut]];
    
    // test var range. In case min==max do not cut
    if ( (TMath::Abs(min-max)>1e-20) && (val<min || val>=max) ) continue;
    
    switch (fDetType[icut]){
    case kITS:
      selected = IsSelectedITS(part,icut);
      break;
    case kTPC:
      selected = IsSelectedTPC(part,icut);
      break;
    case kTRD:
      selected = IsSelectedTRD(part,icut);
      break;
    case kTRDeleEff:
      selected = IsSelectedTRDeleEff(part,icut);
      break;
    case kTOF:
      selected = IsSelectedTOF(part,icut);
      break;
    case kEMCAL:
      selected = IsSelectedEMCAL(part,icut);
      break;
    }
    if (!selected) {
      if (esdTrack) esdTrack->SetTPCsignal(origdEdx,esdTrack->GetTPCsignalSigma(),esdTrack->GetTPCsignalN());

      return kFALSE;
    }
  }

  if (esdTrack) esdTrack->SetTPCsignal(origdEdx,esdTrack->GetTPCsignalSigma(),esdTrack->GetTPCsignalN());
  return selected;
}

//______________________________________________
Bool_t AliDielectronPID::IsSelectedITS(AliVTrack * const part, Int_t icut)
{
  //
  // ITS part of the PID check
  // Don't accept the track if there was no pid bit set
  //
  
  if (fRequirePIDbit[icut]==AliDielectronPID::kRequire&&!(part->GetStatus()&AliVTrack::kITSpid)) return kFALSE;
  if (fRequirePIDbit[icut]==AliDielectronPID::kIfAvailable&&!(part->GetStatus()&AliVTrack::kITSpid)) return kTRUE;

  Double_t mom=part->P();
  
  Float_t numberOfSigmas=fPIDResponse->NumberOfSigmasITS(part, fPartType[icut]);
  
  // test if we are supposed to use a function for the cut
  if (fFunUpperCut[icut]) fNsigmaUp[icut] =fFunUpperCut[icut]->Eval(mom);
  if (fFunLowerCut[icut]) fNsigmaLow[icut]=fFunLowerCut[icut]->Eval(mom);
  
  Bool_t selected=((numberOfSigmas>=fNsigmaLow[icut])&&(numberOfSigmas<=fNsigmaUp[icut]))^fExclude[icut];
  return selected;
}

//______________________________________________
Bool_t AliDielectronPID::IsSelectedTPC(AliVTrack * const part, Int_t icut)
{
  //
  // TPC part of the PID check
  // Don't accept the track if there was no pid bit set
  //
  if (fRequirePIDbit[icut]==AliDielectronPID::kRequire&&!(part->GetStatus()&AliVTrack::kTPCpid)) return kFALSE;
  if (fRequirePIDbit[icut]==AliDielectronPID::kIfAvailable&&!(part->GetStatus()&AliVTrack::kTPCpid)) return kTRUE;

  Double_t mom=part->GetTPCmomentum();
  
  Float_t numberOfSigmas=fPIDResponse->NumberOfSigmasTPC(part, fPartType[icut]);

  if (fPartType[icut]==AliPID::kElectron){
    numberOfSigmas-=fgCorr;
  }
  
  // test if we are supposed to use a function for the cut
  if (fFunUpperCut[icut]) fNsigmaUp[icut] =fFunUpperCut[icut]->Eval(mom);
  if (fFunLowerCut[icut]) fNsigmaLow[icut]=fFunLowerCut[icut]->Eval(mom);
  
  Bool_t selected=((numberOfSigmas>=fNsigmaLow[icut])&&(numberOfSigmas<=fNsigmaUp[icut]))^fExclude[icut];
  return selected;
}

//______________________________________________
Bool_t AliDielectronPID::IsSelectedTRD(AliVTrack * const part, Int_t icut)
{
  //   
  // TRD part of the pid check
  // the TRD checks on the probabilities.
  //

  if (fRequirePIDbit[icut]==AliDielectronPID::kRequire&&!(part->GetStatus()&AliVTrack::kTRDpid)) return kFALSE;
  if (fRequirePIDbit[icut]==AliDielectronPID::kIfAvailable&&!(part->GetStatus()&AliVTrack::kTRDpid)) return kTRUE;
  if (fRequirePIDbit[icut]==AliDielectronPID::kIfAvailable && (part->GetTRDntrackletsPID()<4)) return kTRUE;

  Double_t p[AliPID::kSPECIES]={0.};
  fPIDResponse->ComputeTRDProbability(part,AliPID::kSPECIES,p);
  Float_t particleProb=p[fPartType[icut]];

  Bool_t selected=((particleProb>=fNsigmaLow[icut])&&(particleProb<=fNsigmaUp[icut]))^fExclude[icut];
  return selected;
}

//______________________________________________
Bool_t AliDielectronPID::IsSelectedTRDeleEff(AliVTrack * const part, Int_t icut)
{
  //
  // TRD part of the pid check using electron efficiency requirement
  // in this case the upper limit as well as the particle specie is ignored 
  //   and the lower limit regarded as the requested electron efficiency
  //

  if (fRequirePIDbit[icut]==AliDielectronPID::kRequire&&!(part->GetStatus()&AliVTrack::kTRDpid)) return kFALSE;
  if (fRequirePIDbit[icut]==AliDielectronPID::kIfAvailable&&!(part->GetStatus()&AliVTrack::kTRDpid)) return kTRUE;

  Bool_t selected=fPIDResponse->IdentifiedAsElectronTRD(part,fNsigmaLow[icut])^fExclude[icut];
  return selected;
}

//______________________________________________
Bool_t AliDielectronPID::IsSelectedTOF(AliVTrack * const part, Int_t icut)
{
  //
  // TOF part of the PID check
  // Don't accept the track if there was no pid bit set
  //
  
  if (fRequirePIDbit[icut]==AliDielectronPID::kRequire&&!(part->GetStatus()&AliVTrack::kTOFpid)) return kFALSE;
  if (fRequirePIDbit[icut]==AliDielectronPID::kIfAvailable&&!(part->GetStatus()&AliVTrack::kTOFpid)) return kTRUE;

  Float_t numberOfSigmas=fPIDResponse->NumberOfSigmasTOF(part, fPartType[icut]);
  
  Bool_t selected=((numberOfSigmas>=fNsigmaLow[icut])&&(numberOfSigmas<=fNsigmaUp[icut]))^fExclude[icut];
  return selected;
}

//______________________________________________
Bool_t AliDielectronPID::IsSelectedEMCAL(AliVTrack * const part, Int_t icut)
{
  //
  // emcal pid selecttion
  //

  //TODO: correct way to check for emcal pid?
  Float_t numberOfSigmas=fPIDResponse->NumberOfSigmasEMCAL(part, fPartType[icut]);

  Bool_t hasPID=numberOfSigmas>-998.;

  if (fRequirePIDbit[icut]==AliDielectronPID::kRequire&&!hasPID) return kFALSE;
  if (fRequirePIDbit[icut]==AliDielectronPID::kIfAvailable&&!hasPID) return kTRUE;


  Bool_t selected=((numberOfSigmas>=fNsigmaLow[icut])&&(numberOfSigmas<=fNsigmaUp[icut]))^fExclude[icut];
  return selected;
}

//______________________________________________
void AliDielectronPID::SetDefaults(Int_t def){
  //
  // initialise default pid strategies
  //

  if (def==0){
    // 2sigma bands TPC:
    // - include e
    // - exclude mu,K,pi,p
    // -complete p range
    AddCut(kTPC,AliPID::kElectron,2);
    AddCut(kTPC,AliPID::kMuon,-2.,2.,0.,0.,kTRUE);
    AddCut(kTPC,AliPID::kPion,-2.,2.,0.,0.,kTRUE);
    AddCut(kTPC,AliPID::kKaon,-2.,2.,0.,0.,kTRUE);
    AddCut(kTPC,AliPID::kProton,-2.,2.,0.,0.,kTRUE);
  } else if (def==1) {
    // 2sigma bands TPC:
    // - include e 0<p<inf
    // - exclude mu,K,pi,p 0<p<2
    AddCut(kTPC,AliPID::kElectron,2.);
    AddCut(kTPC,AliPID::kMuon,-2.,2.,0.,2.,kTRUE);
    AddCut(kTPC,AliPID::kPion,-2.,2.,0.,2.,kTRUE);
    AddCut(kTPC,AliPID::kKaon,-2.,2.,0.,2.,kTRUE);
    AddCut(kTPC,AliPID::kProton,-2.,2.,0.,2.,kTRUE);
    
  } else if (def==2) {
    // include 2sigma e TPC
    // 3sigma bands TOF
    // - exclude K,P
    AddCut(kTPC,AliPID::kElectron,-3.,3.);
    AddCut(kTPC,AliPID::kPion,-3.,3.,0.,0.,kTRUE);
    AddCut(kTPC,AliPID::kProton,-3.,3.,0.,0.,kTRUE);

  } else if (def==3 || def==4) { // def3 and def4 are the same??
    // include 2sigma e TPC
    // 3sigma bands TOF
    // - exclude K 0<p<1
    // - exclude P 0<p<2
    AddCut(kTPC,AliPID::kElectron,2);
    AddCut(kTOF,AliPID::kKaon,-3.,3.,0.,1.,kTRUE);
    AddCut(kTOF,AliPID::kProton,-6.,6.,0.,1.,kTRUE);
    AddCut(kTOF,AliPID::kProton,-3.,3.,1.,2.,kTRUE);
    
  } else if (def==5) {
    AddCut(kTPC,AliPID::kElectron,-0.5,3);
    AddCut(kTOF,AliPID::kElectron,-3,3,0,1.5);
  } else if (def==6) {
    // lower cut TPC: parametrisation by HFE
    // upper cut TPC: 3 sigma
    // TOF ele band 3sigma 0<p<1.5GeV
    TF1 *lowerCut=new TF1("lowerCut", "[0] * TMath::Exp([1]*x)", 0, 100);
    lowerCut->SetParameters(-2.7,-0.4357);
    AddCut(kTPC,AliPID::kElectron,lowerCut,3.);
    AddCut(kTOF,AliPID::kElectron,-3,3,0,1.5);
  } else if (def==7) {
    // wide TPC cut
    // TOF ele band 3sigma 0<p<1.5GeV
    AddCut(kTPC,AliPID::kElectron,10.);
    AddCut(kTOF,AliPID::kElectron,-3,3,0,1.5);
  } else if (def==8) {
    // TOF 5 sigma inclusion if TOFpid available
    // this should reduce K,p,Pi to a large extent
    AddCut(kTOF,AliPID::kElectron,-5,5,0,200,kFALSE,AliDielectronPID::kIfAvailable);
  } else if (def==9) {
    // lower cut TPC: parametrisation by HFE
    // upper cut TPC: 3 sigma
    // TOF 5 sigma inclusion if TOFpid available
    // this should reduce K,p,Pi to a large extent
    TF1 *lowerCut=new TF1("lowerCut", "[0] * TMath::Exp([1]*x)", 0, 100);
    lowerCut->SetParameters(-2.65,-0.6757);
    AddCut(kTPC,AliPID::kElectron,lowerCut,4.);
    AddCut(kTOF,AliPID::kElectron,-5,5,0,200,kFALSE,AliDielectronPID::kIfAvailable);

  } else if (def==10) {
    AddCut(kTOF,AliPID::kElectron,-5,5,0,200,kFALSE,AliDielectronPID::kIfAvailable);
    AddCut(kTPC,AliPID::kElectron,3.);
    AddCut(kTPC,AliPID::kPion,-3.,3.,0.,0.,kTRUE);
    AddCut(kTPC,AliPID::kProton,-3.,3.,0.,0.,kTRUE);
    
  } else if (def==11) {
    // lower cut TPC: parametrisation by HFE
    // only use from period d on !!
    // upper cut TPC: 3 sigma
    // TOF ele band 3sigma 0<p<2.0GeV
    TF1 *lowerCut=new TF1("lowerCut", "[0] * TMath::Exp([1]*x)+[2]", 0, 100);
    lowerCut->SetParameters(-3.718,-0.4,0.27);
    AddCut(kTPC,AliPID::kElectron,lowerCut,3.);
    AddCut(kTOF,AliPID::kElectron,-3,3,0,2.);
  } else if (def==12) {
    // lower cut TPC: parametrisation by HFE
    // only use from period d on !!
    // upper cut TPC: 3 sigma
    // TOF 5 sigma inclusion if TOFpid available
    // this should reduce K,p,Pi to a large extent
    TF1 *lowerCut=new TF1("lowerCut", "[0] * TMath::Exp([1]*x)+[2]", 0, 100);
    lowerCut->SetParameters(-3.718,-0.4,0.27);
    AddCut(kTPC,AliPID::kElectron,lowerCut,4.);
    AddCut(kTOF,AliPID::kElectron,-5,5,0,200,kFALSE,AliDielectronPID::kIfAvailable);
  }

}

//______________________________________________
void AliDielectronPID::SetCorrVal(Double_t run)
{
  //
  // set correction value for run
  //
  fgCorr=0;
  if (!fgFitCorr) return;
  fgCorr=fgFitCorr->Eval(run);
  if (run<fgFitCorr->GetX()[0]) fgCorr=fgFitCorr->GetY()[0];
  if (run>fgFitCorr->GetX()[fgFitCorr->GetN()-1]) fgCorr=fgFitCorr->GetY()[fgFitCorr->GetN()-1];
//   printf("Corr: %f\n",fgCorr);
}

//______________________________________________
Double_t AliDielectronPID::GetEtaCorr(AliVTrack *track)
{
  //
  // return eta correction
  //
  if (!fgFunEtaCorr) return 1;
  return fgFunEtaCorr->Eval(track->Eta());
}
Commit	Line	Data
8df8e382	1	/*************************************************************************
	2	* Copyright(c) 1998-2009, ALICE Experiment at CERN, All rights reserved. *
	3	* *
	4	* Author: The ALICE Off-line Project. *
	5	* Contributors are mentioned in the code where appropriate. *
	6	* *
	7	* Permission to use, copy, modify and distribute this software and its *
	8	* documentation strictly for non-commercial purposes is hereby granted *
	9	* without fee, provided that the above copyright notice appears in all *
	10	* copies and that both the copyright notice and this permission notice *
	11	* appear in the supporting documentation. The authors make no claims *
	12	* about the suitability of this software for any purpose. It is *
	13	* provided "as is" without express or implied warranty. *
	14	**************************************************************************/
	15
	16	///////////////////////////////////////////////////////////////////////////
	17	// Dielectron PID //
	18	// //
	19	// //
	20	/*
	21	Detailed description
	22
	23
	24	*/
	25	// //
	26	///////////////////////////////////////////////////////////////////////////
	27
	28	#include <TMath.h>
	29	#include <TF1.h>
48609e3d	30	#include <TGraph.h>
8df8e382	31
164bfb53	32	#include <AliVTrack.h>
5720c765	33	#include <AliVCluster.h>
8df8e382	34	#include <AliLog.h>
ffbede40	35	#include <AliExternalTrackParam.h>
5720c765	36	#include <AliPIDResponse.h>
5720c765	37	#include <AliESDtrack.h> //!!!!! Remove once Eta correction is treated in the tender
8df8e382	38
	39	#include "AliDielectronVarManager.h"
	40
	41	#include "AliDielectronPID.h"
	42
	43	ClassImp(AliDielectronPID)
	44
48609e3d	45	TGraph *AliDielectronPID::fgFitCorr=0x0;
48609e3d	46	Double_t AliDielectronPID::fgCorr=0.0;
5720c765	47	TF1 *AliDielectronPID::fgFunEtaCorr=0x0;
48609e3d	48
8df8e382	49	AliDielectronPID::AliDielectronPID() :
	50	AliAnalysisCuts(),
	51	fNcuts(0),
5720c765	52	fPIDResponse(0x0)
8df8e382	53	{
	54	//
	55	// Default Constructor
	56	//
	57	for (Int_t icut=0; icut<kNmaxPID; ++icut){
	58	fDetType[icut]=kTPC;
	59	fPartType[icut]=AliPID::kPion;
	60	fNsigmaLow[icut]=0;
	61	fNsigmaUp[icut]=0;
5720c765	62	fmin[icut]=0;
5720c765	63	fmax[icut]=0;
8df8e382	64	fExclude[icut]=kFALSE;
	65	fFunUpperCut[icut]=0x0;
	66	fFunLowerCut[icut]=0x0;
61d106d3	67	fRequirePIDbit[icut]=0;
5720c765	68	fActiveCuts[icut]=-1;
8df8e382	69	}
	70	}
	71
	72	//______________________________________________
	73	AliDielectronPID::AliDielectronPID(const char* name, const char* title) :
	74	AliAnalysisCuts(name, title),
	75	fNcuts(0),
5720c765	76	fPIDResponse(0x0)
8df8e382	77	{
	78	//
	79	// Named Constructor
	80	//
	81	for (Int_t icut=0; icut<kNmaxPID; ++icut){
	82	fDetType[icut]=kTPC;
	83	fPartType[icut]=AliPID::kPion;
	84	fNsigmaLow[icut]=0;
	85	fNsigmaUp[icut]=0;
5720c765	86	fmin[icut]=0;
5720c765	87	fmax[icut]=0;
8df8e382	88	fExclude[icut]=kFALSE;
	89	fFunUpperCut[icut]=0x0;
	90	fFunLowerCut[icut]=0x0;
61d106d3	91	fRequirePIDbit[icut]=0;
5720c765	92	fActiveCuts[icut]=0;
8df8e382	93	}
	94	}
	95
	96	//______________________________________________
	97	AliDielectronPID::~AliDielectronPID()
	98	{
	99	//
	100	// Default Destructor
	101	//
	102	}
	103
	104	//______________________________________________
	105	void AliDielectronPID::AddCut(DetType det, AliPID::EParticleType type, Double_t nSigmaLow, Double_t nSigmaUp/=-99999./,
5720c765	106	Double_t min/=0/, Double_t max/=0/, Bool_t exclude/=kFALSE/,
5720c765	107	UInt_t pidBitType/=AliDielectronPID::kRequire/, Int_t var/=-1/)
8df8e382	108	{
	109	//
	110	// Add a pid nsigma cut
5720c765	111	// use response of detector 'det' in the range ['min'] to ['max'] for var
5720c765	112	// use a sigma band between 'nSigmaLow' and 'nSigmaUp'
8df8e382	113	// if nSigmaUp==-99999. then nSigmaLow will be uesd as a symmetric band +- nSigmaLow
	114	// specify whether to 'exclude' the given band
	115	//
	116
45b2b1b8	117	if (fNcuts>=kNmaxPID){
8df8e382	118	AliError(Form("only %d pid cut ranges allowed",kNmaxPID));
45b2b1b8	119	return;
8df8e382	120	}
	121	if (TMath::Abs(nSigmaUp+99999.)<1e-20){
	122	nSigmaUp=TMath::Abs(nSigmaLow);
	123	nSigmaLow=-1.*nSigmaUp;
	124	}
	125	fDetType[fNcuts]=det;
	126	fPartType[fNcuts]=type;
	127	fNsigmaLow[fNcuts]=nSigmaLow;
	128	fNsigmaUp[fNcuts]=nSigmaUp;
5720c765	129	fmin[fNcuts]=min;
5720c765	130	fmax[fNcuts]=max;
8df8e382	131	fExclude[fNcuts]=exclude;
61d106d3	132	fRequirePIDbit[fNcuts]=pidBitType;
5720c765	133	fActiveCuts[fNcuts]=(var==-1 ? AliDielectronVarManager::kP : var);
	134
	135	AliInfo(Form("Add PID cut %d: sigma [% .1f,% .1f] \t cut [% .1f,% .f] \t var %d->%s \n",
	136	fNcuts,nSigmaLow,nSigmaUp,min,max,fActiveCuts[fNcuts],AliDielectronVarManager::GetValueName(fActiveCuts[fNcuts])));
8df8e382	137
5720c765	138	++fNcuts;
5720c765	139
8df8e382	140	}
	141
	142	//______________________________________________
	143	void AliDielectronPID::AddCut(DetType det, AliPID::EParticleType type, Double_t nSigmaLow, TF1 * const funUp,
5720c765	144	Double_t min/=0/, Double_t max/=0/, Bool_t exclude/=kFALSE/,
5720c765	145	UInt_t pidBitType/=AliDielectronPID::kRequire/, Int_t var/=-1/)
8df8e382	146	{
	147	//
	148	// cut using a TF1 as upper cut
	149	//
	150	if (funUp==0x0){
	151	AliError("A valid function is required for the upper cut. Not adding the cut!");
	152	return;
	153	}
	154	fFunUpperCut[fNcuts]=funUp;
5720c765	155	AddCut(det,type,nSigmaLow,0.,min,max,exclude,pidBitType,var);
8df8e382	156	}
	157
	158	//______________________________________________
	159	void AliDielectronPID::AddCut(DetType det, AliPID::EParticleType type, TF1 * const funLow, Double_t nSigmaUp,
5720c765	160	Double_t min/=0/, Double_t max/=0/, Bool_t exclude/=kFALSE/,
5720c765	161	UInt_t pidBitType/=AliDielectronPID::kRequire/, Int_t var/=-1/)
8df8e382	162	{
	163	//
	164	// cut using a TF1 as lower cut
	165	//
	166	if (funLow==0x0){
	167	AliError("A valid function is required for the lower cut. Not adding the cut!");
	168	return;
	169	}
	170	fFunLowerCut[fNcuts]=funLow;
5720c765	171	AddCut(det,type,0.,nSigmaUp,min,max,exclude,pidBitType,var);
8df8e382	172	}
	173
	174	//______________________________________________
	175	void AliDielectronPID::AddCut(DetType det, AliPID::EParticleType type, TF1 * const funLow, TF1 * const funUp,
5720c765	176	Double_t min/=0/, Double_t max/=0/, Bool_t exclude/=kFALSE/,
5720c765	177	UInt_t pidBitType/=AliDielectronPID::kRequire/, Int_t var/=-1/)
8df8e382	178	{
	179	//
	180	// cut using a TF1 as lower and upper cut
	181	//
	182	if ( (funUp==0x0) \|\| (funLow==0x0) ){
	183	AliError("A valid function is required for upper and lower cut. Not adding the cut!");
	184	return;
	185	}
	186	fFunUpperCut[fNcuts]=funUp;
	187	fFunLowerCut[fNcuts]=funLow;
5720c765	188	AddCut(det,type,0.,0.,min,max,exclude,pidBitType,var);
8df8e382	189	}
	190
	191	//______________________________________________
	192	Bool_t AliDielectronPID::IsSelected(TObject* track)
	193	{
	194	//
	195	// perform PID cuts
	196	//
	197
	198	//loop over all cuts
164bfb53	199	AliVTrack part=static_cast<AliVTrack>(track);
5720c765	200	AliESDtrack *esdTrack=0x0;
5720c765	201	Double_t origdEdx=-1;
8df8e382	202
5720c765	203	// apply ETa correction, remove once this is in the tender
	204	if( (part->IsA() == AliESDtrack::Class()) && fgFunEtaCorr ){
	205	esdTrack=static_cast<AliESDtrack*>(part);
	206	origdEdx=esdTrack->GetTPCsignal();
	207	esdTrack->SetTPCsignal(origdEdx/GetEtaCorr(esdTrack),esdTrack->GetTPCsignalSigma(),esdTrack->GetTPCsignalN());
	208	}
8df8e382	209
5720c765	210
	211	//Fill values
	212	Double_t values[AliDielectronVarManager::kNMaxValues];
	213	AliDielectronVarManager::Fill(track,values);
8df8e382	214
5720c765	215	Bool_t selected=kFALSE;
	216	fPIDResponse=AliDielectronVarManager::GetPIDResponse();
	217	for (UChar_t icut=0; icut<fNcuts; ++icut){
	218	Double_t min=fmin[icut];
	219	Double_t max=fmax[icut];
	220	Double_t val=values[fActiveCuts[icut]];
	221
	222	// test var range. In case min==max do not cut
	223	if ( (TMath::Abs(min-max)>1e-20) && (val<min \|\| val>=max) ) continue;
	224
8df8e382	225	switch (fDetType[icut]){
	226	case kITS:
	227	selected = IsSelectedITS(part,icut);
	228	break;
	229	case kTPC:
	230	selected = IsSelectedTPC(part,icut);
	231	break;
	232	case kTRD:
	233	selected = IsSelectedTRD(part,icut);
	234	break;
5720c765	235	case kTRDeleEff:
	236	selected = IsSelectedTRDeleEff(part,icut);
	237	break;
8df8e382	238	case kTOF:
	239	selected = IsSelectedTOF(part,icut);
	240	break;
5720c765	241	case kEMCAL:
	242	selected = IsSelectedEMCAL(part,icut);
	243	break;
	244	}
	245	if (!selected) {
	246	if (esdTrack) esdTrack->SetTPCsignal(origdEdx,esdTrack->GetTPCsignalSigma(),esdTrack->GetTPCsignalN());
	247
	248	return kFALSE;
8df8e382	249	}
8df8e382	250	}
8df8e382	251
5720c765	252	if (esdTrack) esdTrack->SetTPCsignal(origdEdx,esdTrack->GetTPCsignalSigma(),esdTrack->GetTPCsignalN());
8df8e382	253	return selected;
	254	}
	255
	256	//______________________________________________
ffbede40	257	Bool_t AliDielectronPID::IsSelectedITS(AliVTrack * const part, Int_t icut)
8df8e382	258	{
	259	//
	260	// ITS part of the PID check
	261	// Don't accept the track if there was no pid bit set
	262	//
8df8e382	263
5720c765	264	if (fRequirePIDbit[icut]==AliDielectronPID::kRequire&&!(part->GetStatus()&AliVTrack::kITSpid)) return kFALSE;
5720c765	265	if (fRequirePIDbit[icut]==AliDielectronPID::kIfAvailable&&!(part->GetStatus()&AliVTrack::kITSpid)) return kTRUE;
ffbede40	266
ffbede40	267	Double_t mom=part->P();
164bfb53	268
5720c765	269	Float_t numberOfSigmas=fPIDResponse->NumberOfSigmasITS(part, fPartType[icut]);
ffbede40	270
	271	// test if we are supposed to use a function for the cut
	272	if (fFunUpperCut[icut]) fNsigmaUp[icut] =fFunUpperCut[icut]->Eval(mom);
	273	if (fFunLowerCut[icut]) fNsigmaLow[icut]=fFunLowerCut[icut]->Eval(mom);
	274
8df8e382	275	Bool_t selected=((numberOfSigmas>=fNsigmaLow[icut])&&(numberOfSigmas<=fNsigmaUp[icut]))^fExclude[icut];
	276	return selected;
	277	}
	278
	279	//______________________________________________
ffbede40	280	Bool_t AliDielectronPID::IsSelectedTPC(AliVTrack * const part, Int_t icut)
8df8e382	281	{
	282	//
	283	// TPC part of the PID check
	284	// Don't accept the track if there was no pid bit set
	285	//
5720c765	286	if (fRequirePIDbit[icut]==AliDielectronPID::kRequire&&!(part->GetStatus()&AliVTrack::kTPCpid)) return kFALSE;
5720c765	287	if (fRequirePIDbit[icut]==AliDielectronPID::kIfAvailable&&!(part->GetStatus()&AliVTrack::kTPCpid)) return kTRUE;
48609e3d	288
5720c765	289	Double_t mom=part->GetTPCmomentum();
ffbede40	290
5720c765	291	Float_t numberOfSigmas=fPIDResponse->NumberOfSigmasTPC(part, fPartType[icut]);
5720c765	292
2a14a7b1	293	if (fPartType[icut]==AliPID::kElectron){
2a14a7b1	294	numberOfSigmas-=fgCorr;
8df8e382	295	}
ffbede40	296
	297	// test if we are supposed to use a function for the cut
	298	if (fFunUpperCut[icut]) fNsigmaUp[icut] =fFunUpperCut[icut]->Eval(mom);
	299	if (fFunLowerCut[icut]) fNsigmaLow[icut]=fFunLowerCut[icut]->Eval(mom);
	300
8df8e382	301	Bool_t selected=((numberOfSigmas>=fNsigmaLow[icut])&&(numberOfSigmas<=fNsigmaUp[icut]))^fExclude[icut];
	302	return selected;
	303	}
	304
	305	//______________________________________________
5720c765	306	Bool_t AliDielectronPID::IsSelectedTRD(AliVTrack * const part, Int_t icut)
8df8e382	307	{
	308	//
	309	// TRD part of the pid check
5720c765	310	// the TRD checks on the probabilities.
	311	//
	312
	313	if (fRequirePIDbit[icut]==AliDielectronPID::kRequire&&!(part->GetStatus()&AliVTrack::kTRDpid)) return kFALSE;
	314	if (fRequirePIDbit[icut]==AliDielectronPID::kIfAvailable&&!(part->GetStatus()&AliVTrack::kTRDpid)) return kTRUE;
	315	if (fRequirePIDbit[icut]==AliDielectronPID::kIfAvailable && (part->GetTRDntrackletsPID()<4)) return kTRUE;
	316
	317	Double_t p[AliPID::kSPECIES]={0.};
	318	fPIDResponse->ComputeTRDProbability(part,AliPID::kSPECIES,p);
	319	Float_t particleProb=p[fPartType[icut]];
	320
	321	Bool_t selected=((particleProb>=fNsigmaLow[icut])&&(particleProb<=fNsigmaUp[icut]))^fExclude[icut];
	322	return selected;
	323	}
	324
	325	//______________________________________________
	326	Bool_t AliDielectronPID::IsSelectedTRDeleEff(AliVTrack * const part, Int_t icut)
	327	{
8df8e382	328	//
5720c765	329	// TRD part of the pid check using electron efficiency requirement
	330	// in this case the upper limit as well as the particle specie is ignored
	331	// and the lower limit regarded as the requested electron efficiency
	332	//
	333
	334	if (fRequirePIDbit[icut]==AliDielectronPID::kRequire&&!(part->GetStatus()&AliVTrack::kTRDpid)) return kFALSE;
	335	if (fRequirePIDbit[icut]==AliDielectronPID::kIfAvailable&&!(part->GetStatus()&AliVTrack::kTRDpid)) return kTRUE;
	336
	337	Bool_t selected=fPIDResponse->IdentifiedAsElectronTRD(part,fNsigmaLow[icut])^fExclude[icut];
	338	return selected;
8df8e382	339	}
	340
	341	//______________________________________________
ffbede40	342	Bool_t AliDielectronPID::IsSelectedTOF(AliVTrack * const part, Int_t icut)
8df8e382	343	{
	344	//
	345	// TOF part of the PID check
	346	// Don't accept the track if there was no pid bit set
	347	//
8df8e382	348
5720c765	349	if (fRequirePIDbit[icut]==AliDielectronPID::kRequire&&!(part->GetStatus()&AliVTrack::kTOFpid)) return kFALSE;
	350	if (fRequirePIDbit[icut]==AliDielectronPID::kIfAvailable&&!(part->GetStatus()&AliVTrack::kTOFpid)) return kTRUE;
	351
	352	Float_t numberOfSigmas=fPIDResponse->NumberOfSigmasTOF(part, fPartType[icut]);
8df8e382	353
	354	Bool_t selected=((numberOfSigmas>=fNsigmaLow[icut])&&(numberOfSigmas<=fNsigmaUp[icut]))^fExclude[icut];
	355	return selected;
	356	}
	357
5720c765	358	//______________________________________________
	359	Bool_t AliDielectronPID::IsSelectedEMCAL(AliVTrack * const part, Int_t icut)
	360	{
	361	//
	362	// emcal pid selecttion
	363	//
	364
	365	//TODO: correct way to check for emcal pid?
	366	Float_t numberOfSigmas=fPIDResponse->NumberOfSigmasEMCAL(part, fPartType[icut]);
	367
	368	Bool_t hasPID=numberOfSigmas>-998.;
	369
	370	if (fRequirePIDbit[icut]==AliDielectronPID::kRequire&&!hasPID) return kFALSE;
	371	if (fRequirePIDbit[icut]==AliDielectronPID::kIfAvailable&&!hasPID) return kTRUE;
	372
	373
	374	Bool_t selected=((numberOfSigmas>=fNsigmaLow[icut])&&(numberOfSigmas<=fNsigmaUp[icut]))^fExclude[icut];
	375	return selected;
	376	}
	377
8df8e382	378	//______________________________________________
	379	void AliDielectronPID::SetDefaults(Int_t def){
	380	//
	381	// initialise default pid strategies
	382	//
	383
	384	if (def==0){
	385	// 2sigma bands TPC:
	386	// - include e
	387	// - exclude mu,K,pi,p
	388	// -complete p range
	389	AddCut(kTPC,AliPID::kElectron,2);
	390	AddCut(kTPC,AliPID::kMuon,-2.,2.,0.,0.,kTRUE);
	391	AddCut(kTPC,AliPID::kPion,-2.,2.,0.,0.,kTRUE);
	392	AddCut(kTPC,AliPID::kKaon,-2.,2.,0.,0.,kTRUE);
	393	AddCut(kTPC,AliPID::kProton,-2.,2.,0.,0.,kTRUE);
	394	} else if (def==1) {
	395	// 2sigma bands TPC:
	396	// - include e 0<p<inf
	397	// - exclude mu,K,pi,p 0<p<2
8df8e382	398	AddCut(kTPC,AliPID::kElectron,2.);
	399	AddCut(kTPC,AliPID::kMuon,-2.,2.,0.,2.,kTRUE);
	400	AddCut(kTPC,AliPID::kPion,-2.,2.,0.,2.,kTRUE);
	401	AddCut(kTPC,AliPID::kKaon,-2.,2.,0.,2.,kTRUE);
	402	AddCut(kTPC,AliPID::kProton,-2.,2.,0.,2.,kTRUE);
	403
	404	} else if (def==2) {
	405	// include 2sigma e TPC
	406	// 3sigma bands TOF
	407	// - exclude K,P
48609e3d	408	AddCut(kTPC,AliPID::kElectron,-3.,3.);
3505bfad	409	AddCut(kTPC,AliPID::kPion,-3.,3.,0.,0.,kTRUE);
3505bfad	410	AddCut(kTPC,AliPID::kProton,-3.,3.,0.,0.,kTRUE);
8df8e382	411
5720c765	412	} else if (def==3 \|\| def==4) { // def3 and def4 are the same??
8df8e382	413	// include 2sigma e TPC
	414	// 3sigma bands TOF
	415	// - exclude K 0<p<1
	416	// - exclude P 0<p<2
	417	AddCut(kTPC,AliPID::kElectron,2);
	418	AddCut(kTOF,AliPID::kKaon,-3.,3.,0.,1.,kTRUE);
	419	AddCut(kTOF,AliPID::kProton,-6.,6.,0.,1.,kTRUE);
	420	AddCut(kTOF,AliPID::kProton,-3.,3.,1.,2.,kTRUE);
	421
8df8e382	422	} else if (def==5) {
	423	AddCut(kTPC,AliPID::kElectron,-0.5,3);
	424	AddCut(kTOF,AliPID::kElectron,-3,3,0,1.5);
	425	} else if (def==6) {
	426	// lower cut TPC: parametrisation by HFE
	427	// upper cut TPC: 3 sigma
	428	// TOF ele band 3sigma 0<p<1.5GeV
	429	TF1 lowerCut=new TF1("lowerCut", "[0] TMath::Exp([1]*x)", 0, 100);
	430	lowerCut->SetParameters(-2.7,-0.4357);
	431	AddCut(kTPC,AliPID::kElectron,lowerCut,3.);
	432	AddCut(kTOF,AliPID::kElectron,-3,3,0,1.5);
	433	} else if (def==7) {
61d106d3	434	// wide TPC cut
8df8e382	435	// TOF ele band 3sigma 0<p<1.5GeV
	436	AddCut(kTPC,AliPID::kElectron,10.);
	437	AddCut(kTOF,AliPID::kElectron,-3,3,0,1.5);
61d106d3	438	} else if (def==8) {
	439	// TOF 5 sigma inclusion if TOFpid available
	440	// this should reduce K,p,Pi to a large extent
	441	AddCut(kTOF,AliPID::kElectron,-5,5,0,200,kFALSE,AliDielectronPID::kIfAvailable);
	442	} else if (def==9) {
	443	// lower cut TPC: parametrisation by HFE
	444	// upper cut TPC: 3 sigma
	445	// TOF 5 sigma inclusion if TOFpid available
	446	// this should reduce K,p,Pi to a large extent
	447	TF1 lowerCut=new TF1("lowerCut", "[0] TMath::Exp([1]*x)", 0, 100);
164bfb53	448	lowerCut->SetParameters(-2.65,-0.6757);
164bfb53	449	AddCut(kTPC,AliPID::kElectron,lowerCut,4.);
61d106d3	450	AddCut(kTOF,AliPID::kElectron,-5,5,0,200,kFALSE,AliDielectronPID::kIfAvailable);
ba15fdfb	451
61d106d3	452	} else if (def==10) {
	453	AddCut(kTOF,AliPID::kElectron,-5,5,0,200,kFALSE,AliDielectronPID::kIfAvailable);
	454	AddCut(kTPC,AliPID::kElectron,3.);
	455	AddCut(kTPC,AliPID::kPion,-3.,3.,0.,0.,kTRUE);
	456	AddCut(kTPC,AliPID::kProton,-3.,3.,0.,0.,kTRUE);
	457
ba15fdfb	458	} else if (def==11) {
	459	// lower cut TPC: parametrisation by HFE
	460	// only use from period d on !!
	461	// upper cut TPC: 3 sigma
	462	// TOF ele band 3sigma 0<p<2.0GeV
	463	TF1 lowerCut=new TF1("lowerCut", "[0] TMath::Exp([1]*x)+[2]", 0, 100);
	464	lowerCut->SetParameters(-3.718,-0.4,0.27);
	465	AddCut(kTPC,AliPID::kElectron,lowerCut,3.);
	466	AddCut(kTOF,AliPID::kElectron,-3,3,0,2.);
	467	} else if (def==12) {
	468	// lower cut TPC: parametrisation by HFE
	469	// only use from period d on !!
	470	// upper cut TPC: 3 sigma
	471	// TOF 5 sigma inclusion if TOFpid available
	472	// this should reduce K,p,Pi to a large extent
	473	TF1 lowerCut=new TF1("lowerCut", "[0] TMath::Exp([1]*x)+[2]", 0, 100);
	474	lowerCut->SetParameters(-3.718,-0.4,0.27);
	475	AddCut(kTPC,AliPID::kElectron,lowerCut,4.);
	476	AddCut(kTOF,AliPID::kElectron,-5,5,0,200,kFALSE,AliDielectronPID::kIfAvailable);
8df8e382	477	}
ba15fdfb	478
8df8e382	479	}
8df8e382	480
48609e3d	481	//______________________________________________
	482	void AliDielectronPID::SetCorrVal(Double_t run)
	483	{
	484	//
	485	// set correction value for run
	486	//
	487	fgCorr=0;
	488	if (!fgFitCorr) return;
	489	fgCorr=fgFitCorr->Eval(run);
	490	if (run<fgFitCorr->GetX()[0]) fgCorr=fgFitCorr->GetY()[0];
	491	if (run>fgFitCorr->GetX()[fgFitCorr->GetN()-1]) fgCorr=fgFitCorr->GetY()[fgFitCorr->GetN()-1];
	492	// printf("Corr: %f\n",fgCorr);
	493	}
	494
5720c765	495	//______________________________________________
	496	Double_t AliDielectronPID::GetEtaCorr(AliVTrack *track)
	497	{
	498	//
	499	// return eta correction
	500	//
	501	if (!fgFunEtaCorr) return 1;
	502	return fgFunEtaCorr->Eval(track->Eta());
	503	}