[u/mrichter/AliRoot.git] / PWG3 / hfe / AliHFEpidTPC.cxx

/**************************************************************************
* Copyright(c) 1998-1999, 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.                  *
**************************************************************************/
/************************************************************************
 *                                                                      *
 * Class for TPC PID                                                    *
 * Implements the abstract base class AliHFEpidBase                     *
 *                                                                      *
 * Class contains TPC specific cuts and QA histograms                   *
 * Two selection strategies are offered: Selection of certain value     *
 * regions in the TPC dE/dx (by IsSelected), and likelihoods            *
 *                                                                      *
 * Authors:                                                             *
 *                                                                      *
 *   Markus Fasel <M.Fasel@gsi.de>                                      *
 *   Markus Heide <mheide@uni-muenster.de>                              *
 *                                                                      *
 *                                                                      *
 ************************************************************************/
#include <TH2I.h>
#include <TList.h>
#include <TMath.h>
#include <TParticle.h>

#include "AliAODTrack.h"
#include "AliAODMCParticle.h"
#include "AliESDtrack.h"
#include "AliExternalTrackParam.h"
#include "AliLog.h"
#include "AliMCParticle.h"
#include "AliPID.h"
#include "AliTPCpidESD.h"
#include "AliVParticle.h"

#include "AliHFEpidTPC.h"


//___________________________________________________________________
AliHFEpidTPC::AliHFEpidTPC(const char* name) :
  // add a list here
    AliHFEpidBase(name)
  , fLineCrossingsEnabled(0)
  , fNsigmaTPC(3)
  , fRejectionEnabled(0)
  , fPID(NULL)
  , fPIDtpcESD(NULL)
  , fQAList(NULL)
{
  //
  // default  constructor
  // 
  memset(fLineCrossingSigma, 0, sizeof(Double_t) * AliPID::kSPECIES);
  memset(fPAsigCut, 0, sizeof(Float_t) * 2);
  memset(fNAsigmaTPC, 0, sizeof(Float_t) * 2);
  fPID = new AliPID;
  fPIDtpcESD = new AliTPCpidESD;
}

//___________________________________________________________________
AliHFEpidTPC::AliHFEpidTPC(const AliHFEpidTPC &ref) :
    AliHFEpidBase("")
  , fLineCrossingsEnabled(0)
  , fNsigmaTPC(2)
  , fRejectionEnabled(0)
  , fPID(NULL)
  , fPIDtpcESD(NULL)
  , fQAList(NULL)
{
  //
  // Copy constructor
  //
  ref.Copy(*this);
}

//___________________________________________________________________
AliHFEpidTPC &AliHFEpidTPC::operator=(const AliHFEpidTPC &ref){
  //
  // Assignment operator
  //
  if(this != &ref){
    ref.Copy(*this);
  } 
  return *this;
}

//___________________________________________________________________
void AliHFEpidTPC::Copy(TObject &o) const{
  //
  // Copy function 
  // called in copy constructor and assigment operator
  //
  AliHFEpidTPC &target = dynamic_cast<AliHFEpidTPC &>(o);

  target.fLineCrossingsEnabled = fLineCrossingsEnabled;
  target.fNsigmaTPC = fNsigmaTPC;
  target.fRejectionEnabled = fRejectionEnabled;
  target.fPID = new AliPID(*fPID);
  target.fPIDtpcESD = new AliTPCpidESD(*fPIDtpcESD);
  target.fQAList = dynamic_cast<TList *>(fQAList->Clone());
  memcpy(target.fLineCrossingSigma, fLineCrossingSigma, sizeof(Double_t) * AliPID::kSPECIES);
  memcpy(target.fPAsigCut, fPAsigCut, sizeof(Float_t) * 2);
  memcpy(target.fNAsigmaTPC, fNAsigmaTPC, sizeof(Float_t) * 2);
 
  AliHFEpidBase::Copy(target);
}

//___________________________________________________________________
AliHFEpidTPC::~AliHFEpidTPC(){
  //
  // Destructor
  //
  if(fPID) delete fPID;
  if(fPIDtpcESD) delete fPIDtpcESD;
  if(fQAList){
    fQAList->Delete();
    delete fQAList;
  }
}

//___________________________________________________________________
Bool_t AliHFEpidTPC::InitializePID(){
  //
  // Add TPC dE/dx Line crossings
  //
  //AddTPCdEdxLineCrossing(AliPID::kKaon, 0.3, 0.018);
  //AddTPCdEdxLineCrossing(AliPID::kProton, 0.9, 0.054);
  return kTRUE;
}

//___________________________________________________________________
Int_t AliHFEpidTPC::IsSelected(AliHFEpidObject *track)
{
  //
  // For the TPC pid we use the 2-sigma band around the bethe bloch curve
  // for electrons
  // exclusion of the crossing points
  //
  if(track->fAnalysisType == AliHFEpidObject::kESDanalysis){
    AliESDtrack *esdTrack = NULL;
    if(!(esdTrack = dynamic_cast<AliESDtrack *>(track->fRecTrack))) return 0;
    AliMCParticle *mctrack = dynamic_cast<AliMCParticle *>(track->fMCtrack);
    return MakePIDesd(esdTrack, mctrack);
  }else{
    AliAODTrack *aodtrack = NULL;
    if(!(aodtrack = dynamic_cast<AliAODTrack *>(track->fRecTrack))) return 0;
    AliAODMCParticle *aodmctrack = dynamic_cast<AliAODMCParticle *>(track->fMCtrack);
    return MakePIDaod(aodtrack, aodmctrack);
  }
}

//___________________________________________________________________
Int_t AliHFEpidTPC::MakePIDesd(AliESDtrack *esdTrack, AliMCParticle *mctrack){
  //
  //  Doing TPC PID as explained in IsSelected for ESD tracks
  //
  if(IsQAon()) FillTPChistograms(esdTrack, mctrack);
  // exclude crossing points:
  // Determine the bethe values for each particle species
  Bool_t isLineCrossing = kFALSE;
  for(Int_t ispecies = 0; ispecies < AliPID::kSPECIES; ispecies++){
    if(ispecies == AliPID::kElectron) continue;
    if(!(fLineCrossingsEnabled & 1 << ispecies)) continue;
    if(fPIDtpcESD->GetNumberOfSigmas(esdTrack, (AliPID::EParticleType)ispecies) < fLineCrossingSigma[ispecies]){
      // Point in a line crossing region, no PID possible
      isLineCrossing = kTRUE;
      break;
    }
  }
  if(isLineCrossing) return 0;

  // Check particle rejection
  if(HasParticleRejection()){
    Int_t reject = Reject(esdTrack);
    AliDebug(1, Form("PID code from Rejection: %d", reject));
    if(reject != 0) return reject;
  }
  // Check whether distance from the electron line is smaller than n-sigma

  // Perform Asymmetric n-sigma cut if required, else perform symmetric TPC sigma cut
  Float_t nsigma = fPIDtpcESD->GetNumberOfSigmas(esdTrack, AliPID::kElectron);
  Float_t p = 0.;
  Int_t pdg = 0;
  if(HasAsymmetricSigmaCut() && (p = esdTrack->P()) >= fPAsigCut[0] && p <= fPAsigCut[1]){ 
    if(nsigma >= fNAsigmaTPC[0] && nsigma <= fNAsigmaTPC[1]) pdg = 11; 
  } else {
    if(TMath::Abs(nsigma) < fNsigmaTPC ) pdg = 11;
  }
  if(IsQAon() && pdg != 0) (dynamic_cast<TH2I *>(fQAList->At(kHistTPCselected)))->Fill(esdTrack->GetInnerParam() ? esdTrack->GetInnerParam()->P() : esdTrack->P(), esdTrack->GetTPCsignal());
  return pdg;
}

//___________________________________________________________________
Int_t AliHFEpidTPC::MakePIDaod(AliAODTrack * /*aodTrack*/, AliAODMCParticle * /*mctrack*/){
  AliError("AOD PID not yet implemented");
  return 0;
}

//___________________________________________________________________
Int_t AliHFEpidTPC::Reject(AliESDtrack *track){
  //
  // reject particles based on asymmetric sigma cut
  //
  Int_t pdc[AliPID::kSPECIES] = {11,13,211,321,2212};
  Double_t p = track->GetOuterParam() ? track->GetOuterParam()->P() : track->P();
  for(Int_t ispec = 0; ispec < AliPID::kSPECIES; ispec++){
    if(!TESTBIT(fRejectionEnabled, ispec)) continue;
    AliDebug(1, Form("Particle Rejection enabled for species %d", ispec));
    // Particle rejection enabled
    if(p < fRejection[4*ispec] || p > fRejection[4*ispec+2]) continue;
    Double_t sigma = fPIDtpcESD->GetNumberOfSigmas(track, static_cast<AliPID::EParticleType>(ispec));
    AliDebug(1, Form("Sigma %f, min %f, max %f", sigma, fRejection[4*ispec + 1], fRejection[4*ispec+3]));
    if(sigma >= fRejection[4*ispec+1] && sigma <= fRejection[4*ispec+3]) return pdc[ispec] * track->Charge();
  }
  return 0;
}

//___________________________________________________________________
void AliHFEpidTPC::AddTPCdEdxLineCrossing(Int_t species, Double_t sigma){
  //
  // Add exclusion point for the TPC PID where a dEdx line crosses the electron line
  // Stores line center and line sigma
  //
  if(species >= AliPID::kSPECIES){
    AliError("Species doesn't exist");
    return;
  }
  fLineCrossingsEnabled |= 1 << species;
  fLineCrossingSigma[species] = sigma;
}

//___________________________________________________________________
Double_t AliHFEpidTPC::Likelihood(const AliESDtrack *track, Int_t species, Float_t rsig)
{
  //gives probability for track to come from a certain particle species;
  //no priors considered -> probabilities for equal abundances of all species!
  //optional restriction to r-sigma bands of different particle species; default: rsig = 2. (see below)

  //IMPORTANT: Tracks which are judged to be outliers get negative likelihoods -> unusable for combination with further detectors!
  
  if(!track) return -1.;
  Bool_t outlier = kTRUE;
  // Check whether distance from the respective particle line is smaller than r sigma
  for(Int_t hypo = 0; hypo < AliPID::kSPECIES; hypo++){
    if(TMath::Abs(fPIDtpcESD->GetNumberOfSigmas(track, (AliPID::EParticleType)hypo)) > rsig)
      outlier = kTRUE;
    else {
	    outlier = kFALSE;
	    break;
	  }
  }
  if(outlier)
    return -2.;

  Double_t tpcProb[5];

  track->GetTPCpid(tpcProb);

  return tpcProb[species];
}

//___________________________________________________________________
Double_t  AliHFEpidTPC::Suppression(const AliESDtrack *track, Int_t species)
{
  //ratio of likelihoods to be whatever species/to be an electron;
  //as a cross-check for possible particle type suppression compared to electrons
  if(!track) return -20;
  if((Likelihood(track,species) == -2.)||(Likelihood(track,0)== -2.))
    return -30;
  if(Likelihood(track,species) == 0.)
    return -10;
  if (Likelihood(track,0) == 0.)
    return 10.;
  else
    return TMath::Log10(Likelihood(track,species)/(Likelihood(track,0)));


}

//___________________________________________________________________
void AliHFEpidTPC::FillTPChistograms(const AliESDtrack *track, const AliMCParticle *mctrack){
  //
  if(!track)
    return;
 
  Double_t tpcSignal = track->GetTPCsignal();
  Double_t p = track->GetInnerParam() ? track->GetInnerParam()->P() : track->P();
  if(HasMCData()){
    switch(TMath::Abs(mctrack->Particle()->GetPdgCode())){
      case 11:    (dynamic_cast<TH2I *>(fQAList->At(kHistTPCelectron)))->Fill(p, tpcSignal);
	                (dynamic_cast<TH2F *>(fQAList->At(kHistTPCprobEl)))->Fill(p, Likelihood(track, 0));
	                //histograms with ratio of likelihood to be electron/to be other species (a check for quality of likelihood PID);
	                (dynamic_cast<TH2F *>(fQAList->At(kHistTPCenhanceElPi)))->Fill(p, -Suppression(track, 2));
	                (dynamic_cast<TH2F *>(fQAList->At(kHistTPCenhanceElMu)))->Fill(p, -Suppression(track, 1));
	                (dynamic_cast<TH2F *>(fQAList->At(kHistTPCenhanceElKa)))->Fill(p, -Suppression(track, 3));
	                (dynamic_cast<TH2F *>(fQAList->At(kHistTPCenhanceElPro)))->Fill(p, -Suppression(track, 4));
	                //___________________________________________________________________________________________
	                //Likelihoods for electrons to be other particle species
	                (dynamic_cast<TH2F *>(fQAList->At(kHistTPCElprobPi)))->Fill(p, Likelihood(track, 2));
	                (dynamic_cast<TH2F *>(fQAList->At(kHistTPCElprobMu)))->Fill(p, Likelihood(track, 1));
	                (dynamic_cast<TH2F *>(fQAList->At(kHistTPCElprobKa)))->Fill(p, Likelihood(track, 3));
	                (dynamic_cast<TH2F *>(fQAList->At(kHistTPCElprobPro)))->Fill(p, Likelihood(track, 4));
	                break;
	    //___________________________________________________________________________________________
      case 13:    (dynamic_cast<TH2I *>(fQAList->At(kHistTPCmuon)))->Fill(p, tpcSignal);
                  //Likelihood of muon to be an electron
                  (dynamic_cast<TH2F *>(fQAList->At(kHistTPCprobMu)))->Fill(p, Likelihood(track, 0));
                  //ratio of likelihood for muon to be a muon/an electron -> indicator for quality of muon suppression
                  //below functions are the same for other species
	                (dynamic_cast<TH2F *>(fQAList->At(kHistTPCsuppressMu)))->Fill(p, Suppression(track, 1));
                  break;
      case 211:   (dynamic_cast<TH2I *>(fQAList->At(kHistTPCpion)))->Fill(p, tpcSignal);
	                (dynamic_cast<TH2F *>(fQAList->At(kHistTPCprobPi)))->Fill(p, Likelihood(track, 0));
	                (dynamic_cast<TH2F *>(fQAList->At(kHistTPCsuppressPi)))->Fill(p, Suppression(track, 2));
                  break;
      case 321:   (dynamic_cast<TH2I *>(fQAList->At(kHistTPCkaon)))->Fill(p, tpcSignal);
	                (dynamic_cast<TH2F *>(fQAList->At(kHistTPCprobKa)))->Fill(p, Likelihood(track, 0));
	                (dynamic_cast<TH2F *>(fQAList->At(kHistTPCsuppressKa)))->Fill(p, Suppression(track, 3));
                  break;
      case 2212:  (dynamic_cast<TH2I *>(fQAList->At(kHistTPCproton)))->Fill(p, tpcSignal);
	                (dynamic_cast<TH2F *>(fQAList->At(kHistTPCprobPro)))->Fill(p, Likelihood(track, 0));
	                (dynamic_cast<TH2F *>(fQAList->At(kHistTPCsuppressPro)))->Fill(p, Suppression(track, 4));
                  break;
      default:    (dynamic_cast<TH2I *>(fQAList->At(kHistTPCothers)))->Fill(p, tpcSignal);
	                (dynamic_cast<TH2F *>(fQAList->At(kHistTPCprobOth)))->Fill(p, Likelihood(track, 0));

	                break;
    }
  }
  //TPC signal and Likelihood to be electron for all tracks (independent of MC information)
  (dynamic_cast<TH2I *>(fQAList->At(kHistTPCall)))->Fill(p, tpcSignal);
  (dynamic_cast<TH2F *>(fQAList->At(kHistTPCprobAll)))->Fill(p, Likelihood(track, 0));
}

//___________________________________________________________________
void AliHFEpidTPC::AddQAhistograms(TList *qaList){
  fQAList = new TList;
  fQAList->SetName("fTPCqaHistos");

  fQAList->AddAt(new TH2I("fHistTPCelectron","TPC signal for Electrons", 200, 0, 20, 200, 0, 200), kHistTPCelectron); 
  fQAList->AddAt(new TH2I("fHistTPCmuon","TPC signal for Muons", 200, 0, 20, 200, 0, 200), kHistTPCmuon);
  fQAList->AddAt(new TH2I("fHistTPCpion","TPC signal for Pions", 200, 0, 20, 200, 0, 200), kHistTPCpion);
  fQAList->AddAt(new TH2I("fHistTPCkaon","TPC signal for Kaons", 200, 0, 20, 200, 0, 200), kHistTPCkaon);
  fQAList->AddAt(new TH2I("fHistTPCproton","TPC signal for Protons", 200, 0, 20, 200, 0, 200), kHistTPCproton);
  fQAList->AddAt(new TH2I("fHistTPCothers","TPC signal for other species", 200, 0, 20, 200, 0, 200), kHistTPCothers);
  fQAList->AddAt(new TH2I("fHistTPCall","TPC signal for all species", 200, 0, 20, 200, 0, 200), kHistTPCall);
  fQAList->AddAt(new TH2I("fHistTPCselected","TPC signal for all selected particles", 200, 0, 20, 200, 0, 200), kHistTPCselected);

  fQAList->AddAt(new TH2F("fHistTPCprobEl","TPC likelihood for electrons to be an electron vs. p", 200, 0.,20.,200,0.,1.), kHistTPCprobEl);
  fQAList->AddAt(new TH2F("fHistTPCprobPi","TPC likelihood for pions to be an electron vs. p",  200, 0.,20.,200, 0.,1.), kHistTPCprobPi);
  fQAList->AddAt(new TH2F("fHistTPCprobMu","TPC likelihood for muons to be an electron vs. p",  200, 0.,20.,200, 0.,1.), kHistTPCprobMu);
  fQAList->AddAt(new TH2F("fHistTPCprobKa","TPC likelihood for kaons to be an electron vs. p",  200, 0.,20.,200, 0.,1.), kHistTPCprobKa);
  fQAList->AddAt(new TH2F("fHistTPCprobPro","TPC likelihood for protons to be an electron vs. p",  200, 0.,20.,200, 0.,1.), kHistTPCprobPro);
  fQAList->AddAt(new TH2F("fHistTPCprobOth","TPC likelihood for other particles to be an electron vs. p",  200, 0.,20.,200, 0.,1.), kHistTPCprobOth);
  fQAList->AddAt(new TH2F("fHistTPCprobAll","TPC likelihood for all particles to be an electron vs. p",  200, 0.,20.,200, 0.,1.), kHistTPCprobAll);


 fQAList->AddAt(new TH2F("fHistTPCsuppressPi","log10 of TPC Likelihood(pion)/Likelihood(elec) for pions vs. p", 200, 0.,20.,200,-1.,5.8), kHistTPCsuppressPi);
 fQAList->AddAt(new TH2F("fHistTPCsuppressMu","log10 of TPC Likelihood(muon)/Likelihood(elec) for muons vs. p", 200, 0.,20.,200,-1.,5.8), kHistTPCsuppressMu);
 fQAList->AddAt(new TH2F("fHistTPCsuppressKa","log10 of TPC Likelihood(kaon)/Likelihood(elec) for kaons vs. p", 200, 0.,20.,200,-1.,5.8), kHistTPCsuppressKa);
 fQAList->AddAt(new TH2F("fHistTPCsuppressPro","log10 of TPC Likelihood(proton)/Likelihood(elec)for protons vs. p", 200, 0.,20.,200,-1.,5.8), kHistTPCsuppressPro);

 fQAList->AddAt(new TH2F("fHistTPCenhanceElPi","log10 of TPC Likelihood(elec)/Likelihood(pion) for electrons vs. p", 200, 0.,20.,200,-1.,5.8), kHistTPCsuppressPi);
 fQAList->AddAt(new TH2F("fHistTPCenhanceElMu","log10 of TPC Likelihood(elec)/Likelihood(muon) for electrons vs. p", 200, 0.,20.,200,-1.,5.8), kHistTPCsuppressMu);
 fQAList->AddAt(new TH2F("fHistTPCenhanceElKa","log10 of TPC Likelihood(elec)/Likelihood(kaon) for electrons vs. p", 200, 0.,20.,200,-1.,5.8), kHistTPCsuppressKa);
 fQAList->AddAt(new TH2F("fHistTPCenhanceElPro","log10 of TPC Likelihood(elec)/Likelihood(proton) for electrons vs. p", 200, 0.,20.,200,-1.,5.8), kHistTPCsuppressPro);

 fQAList->AddAt(new TH2F("fHistTPCElprobPi","TPC likelihood for electrons to be a pion vs. p", 200, 0.,20.,200,0.,1.), kHistTPCElprobPi);
 fQAList->AddAt(new TH2F("fHistTPCElprobMu","TPC likelihood for electrons to be a muon vs. p", 200, 0.,20.,200,0.,1.), kHistTPCElprobMu);
 fQAList->AddAt(new TH2F("fHistTPCElprobKa","TPC likelihood for electrons to be a kaon vs. p", 200, 0.,20.,200,0.,1.), kHistTPCElprobKa);
 fQAList->AddAt(new TH2F("fHistTPCElprobPro","TPC likelihood for electrons to be a proton vs. p", 200, 0.,20.,200,0.,1.), kHistTPCElprobPro);


  qaList->AddLast(fQAList);
}
Commit	Line	Data
809a4336	1	/**************************************************************************
	2	* Copyright(c) 1998-1999, 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	* Class for TPC PID *
	18	* Implements the abstract base class AliHFEpidBase *
	19	* *
	20	* Class contains TPC specific cuts and QA histograms *
	21	* Two selection strategies are offered: Selection of certain value *
	22	* regions in the TPC dE/dx (by IsSelected), and likelihoods *
	23	* *
	24	* Authors: *
	25	* *
	26	* Markus Fasel <M.Fasel@gsi.de> *
	27	* Markus Heide <mheide@uni-muenster.de> *
	28	* *
	29	* *
	30	************************************************************************/
	31	#include <TH2I.h>
	32	#include <TList.h>
	33	#include <TMath.h>
722347d8	34	#include <TParticle.h>
809a4336	35
722347d8	36	#include "AliAODTrack.h"
722347d8	37	#include "AliAODMCParticle.h"
809a4336	38	#include "AliESDtrack.h"
	39	#include "AliExternalTrackParam.h"
	40	#include "AliLog.h"
722347d8	41	#include "AliMCParticle.h"
809a4336	42	#include "AliPID.h"
	43	#include "AliTPCpidESD.h"
	44	#include "AliVParticle.h"
	45
	46	#include "AliHFEpidTPC.h"
	47
	48
	49
	50	//___________________________________________________________________
	51	AliHFEpidTPC::AliHFEpidTPC(const char* name) :
	52	// add a list here
	53	AliHFEpidBase(name)
	54	, fLineCrossingsEnabled(0)
75d81601	55	, fNsigmaTPC(3)
0792aa82	56	, fRejectionEnabled(0)
75d81601	57	, fPID(NULL)
	58	, fPIDtpcESD(NULL)
	59	, fQAList(NULL)
809a4336	60	{
	61	//
	62	// default constructor
	63	//
809a4336	64	memset(fLineCrossingSigma, 0, sizeof(Double_t) * AliPID::kSPECIES);
722347d8	65	memset(fPAsigCut, 0, sizeof(Float_t) * 2);
722347d8	66	memset(fNAsigmaTPC, 0, sizeof(Float_t) * 2);
809a4336	67	fPID = new AliPID;
	68	fPIDtpcESD = new AliTPCpidESD;
	69	}
	70
	71	//___________________________________________________________________
	72	AliHFEpidTPC::AliHFEpidTPC(const AliHFEpidTPC &ref) :
	73	AliHFEpidBase("")
	74	, fLineCrossingsEnabled(0)
	75	, fNsigmaTPC(2)
0792aa82	76	, fRejectionEnabled(0)
75d81601	77	, fPID(NULL)
	78	, fPIDtpcESD(NULL)
	79	, fQAList(NULL)
809a4336	80	{
	81	//
	82	// Copy constructor
	83	//
	84	ref.Copy(*this);
	85	}
	86
	87	//___________________________________________________________________
	88	AliHFEpidTPC &AliHFEpidTPC::operator=(const AliHFEpidTPC &ref){
	89	//
	90	// Assignment operator
	91	//
	92	if(this != &ref){
	93	ref.Copy(*this);
	94	}
	95	return *this;
	96	}
	97
75d81601	98	//___________________________________________________________________
809a4336	99	void AliHFEpidTPC::Copy(TObject &o) const{
	100	//
	101	// Copy function
	102	// called in copy constructor and assigment operator
	103	//
	104	AliHFEpidTPC &target = dynamic_cast<AliHFEpidTPC &>(o);
	105
	106	target.fLineCrossingsEnabled = fLineCrossingsEnabled;
	107	target.fNsigmaTPC = fNsigmaTPC;
0792aa82	108	target.fRejectionEnabled = fRejectionEnabled;
809a4336	109	target.fPID = new AliPID(*fPID);
	110	target.fPIDtpcESD = new AliTPCpidESD(*fPIDtpcESD);
	111	target.fQAList = dynamic_cast<TList *>(fQAList->Clone());
75d81601	112	memcpy(target.fLineCrossingSigma, fLineCrossingSigma, sizeof(Double_t) * AliPID::kSPECIES);
722347d8	113	memcpy(target.fPAsigCut, fPAsigCut, sizeof(Float_t) * 2);
	114	memcpy(target.fNAsigmaTPC, fNAsigmaTPC, sizeof(Float_t) * 2);
	115
809a4336	116	AliHFEpidBase::Copy(target);
	117	}
	118
	119	//___________________________________________________________________
	120	AliHFEpidTPC::~AliHFEpidTPC(){
	121	//
	122	// Destructor
	123	//
	124	if(fPID) delete fPID;
	125	if(fPIDtpcESD) delete fPIDtpcESD;
	126	if(fQAList){
	127	fQAList->Delete();
	128	delete fQAList;
	129	}
	130	}
	131
	132	//___________________________________________________________________
	133	Bool_t AliHFEpidTPC::InitializePID(){
	134	//
	135	// Add TPC dE/dx Line crossings
	136	//
75d81601	137	//AddTPCdEdxLineCrossing(AliPID::kKaon, 0.3, 0.018);
75d81601	138	//AddTPCdEdxLineCrossing(AliPID::kProton, 0.9, 0.054);
809a4336	139	return kTRUE;
	140	}
	141
	142	//___________________________________________________________________
722347d8	143	Int_t AliHFEpidTPC::IsSelected(AliHFEpidObject *track)
809a4336	144	{
	145	//
	146	// For the TPC pid we use the 2-sigma band around the bethe bloch curve
	147	// for electrons
	148	// exclusion of the crossing points
	149	//
722347d8	150	if(track->fAnalysisType == AliHFEpidObject::kESDanalysis){
	151	AliESDtrack *esdTrack = NULL;
	152	if(!(esdTrack = dynamic_cast<AliESDtrack *>(track->fRecTrack))) return 0;
	153	AliMCParticle mctrack = dynamic_cast<AliMCParticle >(track->fMCtrack);
	154	return MakePIDesd(esdTrack, mctrack);
	155	}else{
	156	AliAODTrack *aodtrack = NULL;
	157	if(!(aodtrack = dynamic_cast<AliAODTrack *>(track->fRecTrack))) return 0;
	158	AliAODMCParticle aodmctrack = dynamic_cast<AliAODMCParticle >(track->fMCtrack);
	159	return MakePIDaod(aodtrack, aodmctrack);
	160	}
	161	}
	162
	163	//___________________________________________________________________
	164	Int_t AliHFEpidTPC::MakePIDesd(AliESDtrack esdTrack, AliMCParticle mctrack){
	165	//
	166	// Doing TPC PID as explained in IsSelected for ESD tracks
	167	//
	168	if(IsQAon()) FillTPChistograms(esdTrack, mctrack);
809a4336	169	// exclude crossing points:
809a4336	170	// Determine the bethe values for each particle species
809a4336	171	Bool_t isLineCrossing = kFALSE;
809a4336	172	for(Int_t ispecies = 0; ispecies < AliPID::kSPECIES; ispecies++){
75d81601	173	if(ispecies == AliPID::kElectron) continue;
809a4336	174	if(!(fLineCrossingsEnabled & 1 << ispecies)) continue;
75d81601	175	if(fPIDtpcESD->GetNumberOfSigmas(esdTrack, (AliPID::EParticleType)ispecies) < fLineCrossingSigma[ispecies]){
809a4336	176	// Point in a line crossing region, no PID possible
	177	isLineCrossing = kTRUE;
	178	break;
	179	}
	180	}
	181	if(isLineCrossing) return 0;
0792aa82	182
	183	// Check particle rejection
	184	if(HasParticleRejection()){
	185	Int_t reject = Reject(esdTrack);
	186	AliDebug(1, Form("PID code from Rejection: %d", reject));
	187	if(reject != 0) return reject;
	188	}
809a4336	189	// Check whether distance from the electron line is smaller than n-sigma
722347d8	190
	191	// Perform Asymmetric n-sigma cut if required, else perform symmetric TPC sigma cut
	192	Float_t nsigma = fPIDtpcESD->GetNumberOfSigmas(esdTrack, AliPID::kElectron);
	193	Float_t p = 0.;
0792aa82	194	Int_t pdg = 0;
722347d8	195	if(HasAsymmetricSigmaCut() && (p = esdTrack->P()) >= fPAsigCut[0] && p <= fPAsigCut[1]){
0792aa82	196	if(nsigma >= fNAsigmaTPC[0] && nsigma <= fNAsigmaTPC[1]) pdg = 11;
722347d8	197	} else {
0792aa82	198	if(TMath::Abs(nsigma) < fNsigmaTPC ) pdg = 11;
722347d8	199	}
0792aa82	200	if(IsQAon() && pdg != 0) (dynamic_cast<TH2I *>(fQAList->At(kHistTPCselected)))->Fill(esdTrack->GetInnerParam() ? esdTrack->GetInnerParam()->P() : esdTrack->P(), esdTrack->GetTPCsignal());
0792aa82	201	return pdg;
722347d8	202	}
	203
	204	//___________________________________________________________________
	205	Int_t AliHFEpidTPC::MakePIDaod(AliAODTrack * /aodTrack/, AliAODMCParticle * /mctrack/){
	206	AliError("AOD PID not yet implemented");
809a4336	207	return 0;
	208	}
	209
0792aa82	210	//___________________________________________________________________
	211	Int_t AliHFEpidTPC::Reject(AliESDtrack *track){
	212	//
	213	// reject particles based on asymmetric sigma cut
	214	//
	215	Int_t pdc[AliPID::kSPECIES] = {11,13,211,321,2212};
	216	Double_t p = track->GetOuterParam() ? track->GetOuterParam()->P() : track->P();
	217	for(Int_t ispec = 0; ispec < AliPID::kSPECIES; ispec++){
	218	if(!TESTBIT(fRejectionEnabled, ispec)) continue;
	219	AliDebug(1, Form("Particle Rejection enabled for species %d", ispec));
	220	// Particle rejection enabled
	221	if(p < fRejection[4ispec] \|\| p > fRejection[4ispec+2]) continue;
	222	Double_t sigma = fPIDtpcESD->GetNumberOfSigmas(track, static_cast<AliPID::EParticleType>(ispec));
	223	AliDebug(1, Form("Sigma %f, min %f, max %f", sigma, fRejection[4ispec + 1], fRejection[4ispec+3]));
	224	if(sigma >= fRejection[4ispec+1] && sigma <= fRejection[4ispec+3]) return pdc[ispec] * track->Charge();
	225	}
	226	return 0;
	227	}
	228
809a4336	229	//___________________________________________________________________
75d81601	230	void AliHFEpidTPC::AddTPCdEdxLineCrossing(Int_t species, Double_t sigma){
809a4336	231	//
	232	// Add exclusion point for the TPC PID where a dEdx line crosses the electron line
	233	// Stores line center and line sigma
	234	//
	235	if(species >= AliPID::kSPECIES){
	236	AliError("Species doesn't exist");
	237	return;
	238	}
	239	fLineCrossingsEnabled \|= 1 << species;
75d81601	240	fLineCrossingSigma[species] = sigma;
809a4336	241	}
	242
	243	//___________________________________________________________________
	244	Double_t AliHFEpidTPC::Likelihood(const AliESDtrack *track, Int_t species, Float_t rsig)
	245	{
	246	//gives probability for track to come from a certain particle species;
	247	//no priors considered -> probabilities for equal abundances of all species!
	248	//optional restriction to r-sigma bands of different particle species; default: rsig = 2. (see below)
	249
	250	//IMPORTANT: Tracks which are judged to be outliers get negative likelihoods -> unusable for combination with further detectors!
	251
	252	if(!track) return -1.;
809a4336	253	Bool_t outlier = kTRUE;
809a4336	254	// Check whether distance from the respective particle line is smaller than r sigma
75d81601	255	for(Int_t hypo = 0; hypo < AliPID::kSPECIES; hypo++){
78ea5ef4	256	if(TMath::Abs(fPIDtpcESD->GetNumberOfSigmas(track, (AliPID::EParticleType)hypo)) > rsig)
75d81601	257	outlier = kTRUE;
	258	else {
	259	outlier = kFALSE;
	260	break;
	261	}
	262	}
809a4336	263	if(outlier)
	264	return -2.;
	265
75d81601	266	Double_t tpcProb[5];
809a4336	267
75d81601	268	track->GetTPCpid(tpcProb);
809a4336	269
75d81601	270	return tpcProb[species];
809a4336	271	}
809a4336	272
809a4336	273	//___________________________________________________________________
	274	Double_t AliHFEpidTPC::Suppression(const AliESDtrack *track, Int_t species)
	275	{
	276	//ratio of likelihoods to be whatever species/to be an electron;
	277	//as a cross-check for possible particle type suppression compared to electrons
	278	if(!track) return -20;
	279	if((Likelihood(track,species) == -2.)\|\|(Likelihood(track,0)== -2.))
	280	return -30;
	281	if(Likelihood(track,species) == 0.)
	282	return -10;
	283	if (Likelihood(track,0) == 0.)
	284	return 10.;
	285	else
	286	return TMath::Log10(Likelihood(track,species)/(Likelihood(track,0)));
	287
	288
	289	}
75d81601	290
809a4336	291	//___________________________________________________________________
722347d8	292	void AliHFEpidTPC::FillTPChistograms(const AliESDtrack track, const AliMCParticle mctrack){
809a4336	293	//
	294	if(!track)
	295	return;
	296
75d81601	297	Double_t tpcSignal = track->GetTPCsignal();
809a4336	298	Double_t p = track->GetInnerParam() ? track->GetInnerParam()->P() : track->P();
809a4336	299	if(HasMCData()){
722347d8	300	switch(TMath::Abs(mctrack->Particle()->GetPdgCode())){
	301	case 11: (dynamic_cast<TH2I *>(fQAList->At(kHistTPCelectron)))->Fill(p, tpcSignal);
	302	(dynamic_cast<TH2F *>(fQAList->At(kHistTPCprobEl)))->Fill(p, Likelihood(track, 0));
	303	//histograms with ratio of likelihood to be electron/to be other species (a check for quality of likelihood PID);
	304	(dynamic_cast<TH2F *>(fQAList->At(kHistTPCenhanceElPi)))->Fill(p, -Suppression(track, 2));
	305	(dynamic_cast<TH2F *>(fQAList->At(kHistTPCenhanceElMu)))->Fill(p, -Suppression(track, 1));
	306	(dynamic_cast<TH2F *>(fQAList->At(kHistTPCenhanceElKa)))->Fill(p, -Suppression(track, 3));
	307	(dynamic_cast<TH2F *>(fQAList->At(kHistTPCenhanceElPro)))->Fill(p, -Suppression(track, 4));
	308	//___________________________________________________________________________________________
	309	//Likelihoods for electrons to be other particle species
	310	(dynamic_cast<TH2F *>(fQAList->At(kHistTPCElprobPi)))->Fill(p, Likelihood(track, 2));
	311	(dynamic_cast<TH2F *>(fQAList->At(kHistTPCElprobMu)))->Fill(p, Likelihood(track, 1));
	312	(dynamic_cast<TH2F *>(fQAList->At(kHistTPCElprobKa)))->Fill(p, Likelihood(track, 3));
	313	(dynamic_cast<TH2F *>(fQAList->At(kHistTPCElprobPro)))->Fill(p, Likelihood(track, 4));
	314	break;
	315	//___________________________________________________________________________________________
	316	case 13: (dynamic_cast<TH2I *>(fQAList->At(kHistTPCmuon)))->Fill(p, tpcSignal);
	317	//Likelihood of muon to be an electron
	318	(dynamic_cast<TH2F *>(fQAList->At(kHistTPCprobMu)))->Fill(p, Likelihood(track, 0));
	319	//ratio of likelihood for muon to be a muon/an electron -> indicator for quality of muon suppression
	320	//below functions are the same for other species
	321	(dynamic_cast<TH2F *>(fQAList->At(kHistTPCsuppressMu)))->Fill(p, Suppression(track, 1));
	322	break;
	323	case 211: (dynamic_cast<TH2I *>(fQAList->At(kHistTPCpion)))->Fill(p, tpcSignal);
	324	(dynamic_cast<TH2F *>(fQAList->At(kHistTPCprobPi)))->Fill(p, Likelihood(track, 0));
	325	(dynamic_cast<TH2F *>(fQAList->At(kHistTPCsuppressPi)))->Fill(p, Suppression(track, 2));
	326	break;
	327	case 321: (dynamic_cast<TH2I *>(fQAList->At(kHistTPCkaon)))->Fill(p, tpcSignal);
	328	(dynamic_cast<TH2F *>(fQAList->At(kHistTPCprobKa)))->Fill(p, Likelihood(track, 0));
	329	(dynamic_cast<TH2F *>(fQAList->At(kHistTPCsuppressKa)))->Fill(p, Suppression(track, 3));
	330	break;
	331	case 2212: (dynamic_cast<TH2I *>(fQAList->At(kHistTPCproton)))->Fill(p, tpcSignal);
	332	(dynamic_cast<TH2F *>(fQAList->At(kHistTPCprobPro)))->Fill(p, Likelihood(track, 0));
	333	(dynamic_cast<TH2F *>(fQAList->At(kHistTPCsuppressPro)))->Fill(p, Suppression(track, 4));
	334	break;
	335	default: (dynamic_cast<TH2I *>(fQAList->At(kHistTPCothers)))->Fill(p, tpcSignal);
	336	(dynamic_cast<TH2F *>(fQAList->At(kHistTPCprobOth)))->Fill(p, Likelihood(track, 0));
809a4336	337
722347d8	338	break;
809a4336	339	}
	340	}
	341	//TPC signal and Likelihood to be electron for all tracks (independent of MC information)
75d81601	342	(dynamic_cast<TH2I *>(fQAList->At(kHistTPCall)))->Fill(p, tpcSignal);
722347d8	343	(dynamic_cast<TH2F *>(fQAList->At(kHistTPCprobAll)))->Fill(p, Likelihood(track, 0));
809a4336	344	}
	345
	346	//___________________________________________________________________
	347	void AliHFEpidTPC::AddQAhistograms(TList *qaList){
	348	fQAList = new TList;
	349	fQAList->SetName("fTPCqaHistos");
	350
0792aa82	351	fQAList->AddAt(new TH2I("fHistTPCelectron","TPC signal for Electrons", 200, 0, 20, 200, 0, 200), kHistTPCelectron);
	352	fQAList->AddAt(new TH2I("fHistTPCmuon","TPC signal for Muons", 200, 0, 20, 200, 0, 200), kHistTPCmuon);
	353	fQAList->AddAt(new TH2I("fHistTPCpion","TPC signal for Pions", 200, 0, 20, 200, 0, 200), kHistTPCpion);
	354	fQAList->AddAt(new TH2I("fHistTPCkaon","TPC signal for Kaons", 200, 0, 20, 200, 0, 200), kHistTPCkaon);
	355	fQAList->AddAt(new TH2I("fHistTPCproton","TPC signal for Protons", 200, 0, 20, 200, 0, 200), kHistTPCproton);
	356	fQAList->AddAt(new TH2I("fHistTPCothers","TPC signal for other species", 200, 0, 20, 200, 0, 200), kHistTPCothers);
	357	fQAList->AddAt(new TH2I("fHistTPCall","TPC signal for all species", 200, 0, 20, 200, 0, 200), kHistTPCall);
	358	fQAList->AddAt(new TH2I("fHistTPCselected","TPC signal for all selected particles", 200, 0, 20, 200, 0, 200), kHistTPCselected);
809a4336	359
	360	fQAList->AddAt(new TH2F("fHistTPCprobEl","TPC likelihood for electrons to be an electron vs. p", 200, 0.,20.,200,0.,1.), kHistTPCprobEl);
	361	fQAList->AddAt(new TH2F("fHistTPCprobPi","TPC likelihood for pions to be an electron vs. p", 200, 0.,20.,200, 0.,1.), kHistTPCprobPi);
	362	fQAList->AddAt(new TH2F("fHistTPCprobMu","TPC likelihood for muons to be an electron vs. p", 200, 0.,20.,200, 0.,1.), kHistTPCprobMu);
	363	fQAList->AddAt(new TH2F("fHistTPCprobKa","TPC likelihood for kaons to be an electron vs. p", 200, 0.,20.,200, 0.,1.), kHistTPCprobKa);
	364	fQAList->AddAt(new TH2F("fHistTPCprobPro","TPC likelihood for protons to be an electron vs. p", 200, 0.,20.,200, 0.,1.), kHistTPCprobPro);
	365	fQAList->AddAt(new TH2F("fHistTPCprobOth","TPC likelihood for other particles to be an electron vs. p", 200, 0.,20.,200, 0.,1.), kHistTPCprobOth);
	366	fQAList->AddAt(new TH2F("fHistTPCprobAll","TPC likelihood for all particles to be an electron vs. p", 200, 0.,20.,200, 0.,1.), kHistTPCprobAll);
	367
	368
	369	fQAList->AddAt(new TH2F("fHistTPCsuppressPi","log10 of TPC Likelihood(pion)/Likelihood(elec) for pions vs. p", 200, 0.,20.,200,-1.,5.8), kHistTPCsuppressPi);
	370	fQAList->AddAt(new TH2F("fHistTPCsuppressMu","log10 of TPC Likelihood(muon)/Likelihood(elec) for muons vs. p", 200, 0.,20.,200,-1.,5.8), kHistTPCsuppressMu);
	371	fQAList->AddAt(new TH2F("fHistTPCsuppressKa","log10 of TPC Likelihood(kaon)/Likelihood(elec) for kaons vs. p", 200, 0.,20.,200,-1.,5.8), kHistTPCsuppressKa);
	372	fQAList->AddAt(new TH2F("fHistTPCsuppressPro","log10 of TPC Likelihood(proton)/Likelihood(elec)for protons vs. p", 200, 0.,20.,200,-1.,5.8), kHistTPCsuppressPro);
	373
	374	fQAList->AddAt(new TH2F("fHistTPCenhanceElPi","log10 of TPC Likelihood(elec)/Likelihood(pion) for electrons vs. p", 200, 0.,20.,200,-1.,5.8), kHistTPCsuppressPi);
	375	fQAList->AddAt(new TH2F("fHistTPCenhanceElMu","log10 of TPC Likelihood(elec)/Likelihood(muon) for electrons vs. p", 200, 0.,20.,200,-1.,5.8), kHistTPCsuppressMu);
	376	fQAList->AddAt(new TH2F("fHistTPCenhanceElKa","log10 of TPC Likelihood(elec)/Likelihood(kaon) for electrons vs. p", 200, 0.,20.,200,-1.,5.8), kHistTPCsuppressKa);
	377	fQAList->AddAt(new TH2F("fHistTPCenhanceElPro","log10 of TPC Likelihood(elec)/Likelihood(proton) for electrons vs. p", 200, 0.,20.,200,-1.,5.8), kHistTPCsuppressPro);
	378
	379	fQAList->AddAt(new TH2F("fHistTPCElprobPi","TPC likelihood for electrons to be a pion vs. p", 200, 0.,20.,200,0.,1.), kHistTPCElprobPi);
	380	fQAList->AddAt(new TH2F("fHistTPCElprobMu","TPC likelihood for electrons to be a muon vs. p", 200, 0.,20.,200,0.,1.), kHistTPCElprobMu);
	381	fQAList->AddAt(new TH2F("fHistTPCElprobKa","TPC likelihood for electrons to be a kaon vs. p", 200, 0.,20.,200,0.,1.), kHistTPCElprobKa);
	382	fQAList->AddAt(new TH2F("fHistTPCElprobPro","TPC likelihood for electrons to be a proton vs. p", 200, 0.,20.,200,0.,1.), kHistTPCElprobPro);
	383
	384
	385	qaList->AddLast(fQAList);
	386	}