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16 /* $Id: AliAODpidUtil.cxx 38329 2010-01-17 19:17:24Z hristov $ */
18 //-----------------------------------------------------------------
19 // Implementation of the combined PID class
21 // containing information on the particle identification
22 // Origin: Rosa Romita, GSI, r.romita@gsi.de
23 //-----------------------------------------------------------------
28 #include "AliAODpidUtil.h"
29 #include "AliAODEvent.h"
30 #include "AliAODTrack.h"
31 #include "AliAODPid.h"
32 #include "AliTRDPIDResponse.h"
33 #include "AliESDtrack.h"
34 #include "AliAODMCHeader.h"
35 #include "AliAODMCParticle.h"
37 #include <AliDetectorPID.h>
39 ClassImp(AliAODpidUtil)
41 //_________________________________________________________________________
42 Float_t AliAODpidUtil::GetTPCsignalTunedOnData(const AliVTrack *t) const {
43 AliAODTrack *track = (AliAODTrack *) t;
44 Float_t dedx = track->GetTPCsignalTunedOnData();
45 if(dedx > 0) return dedx;
47 dedx = t->GetTPCsignal();
48 track->SetTPCsignalTunedOnData(dedx);
50 if(dedx < 20) return dedx;
53 AliPID::EParticleType type = AliPID::kPion;
55 AliAODMCHeader *mcHeader = dynamic_cast<AliAODMCHeader*>(track->GetAODEvent()->GetList()->FindObject(AliAODMCHeader::StdBranchName()));
57 TClonesArray *mcArray = (TClonesArray*)track->GetAODEvent()->GetList()->FindObject(AliAODMCParticle::StdBranchName());
61 Int_t iS = TMath::Abs(((AliAODMCParticle*)mcArray->At(TMath::Abs(t->GetLabel())))->GetPdgCode());
62 if(iS==AliPID::ParticleCode(AliPID::kElectron)){
63 type = AliPID::kElectron;
65 else if(iS==AliPID::ParticleCode(AliPID::kMuon)){
68 else if(iS==AliPID::ParticleCode(AliPID::kPion)){
71 else if(iS==AliPID::ParticleCode(AliPID::kKaon)){
74 else if(iS==AliPID::ParticleCode(AliPID::kProton)){
75 type = AliPID::kProton;
77 else if(iS==AliPID::ParticleCode(AliPID::kDeuteron)){ // d
78 type = AliPID::kDeuteron;
80 else if(iS==AliPID::ParticleCode(AliPID::kTriton)){ // t
81 type = AliPID::kTriton;
83 else if(iS==AliPID::ParticleCode(AliPID::kHe3)){ // 3He
86 else if(iS==AliPID::ParticleCode(AliPID::kAlpha)){ // 4He
87 type = AliPID::kAlpha;
93 //TODO maybe introduce different dEdxSources?
94 Double_t bethe = fTPCResponse.GetExpectedSignal(track, type, AliTPCPIDResponse::kdEdxDefault, this->UseTPCEtaCorrection());
95 Double_t sigma = fTPCResponse.GetExpectedSigma(track, type, AliTPCPIDResponse::kdEdxDefault, this->UseTPCEtaCorrection());
96 dedx = gRandom->Gaus(bethe,sigma);
98 if(iS == AliPID::ParticleCode(AliPID::kHe3) || iS == AliPID::ParticleCode(AliPID::kAlpha)) dedx *= 5;
103 track->SetTPCsignalTunedOnData(dedx);
106 //_________________________________________________________________________
107 Float_t AliAODpidUtil::GetNumberOfSigmasTOF(const AliVParticle *vtrack, AliPID::EParticleType type) const
110 // Number of sigma implementation for the TOF
113 AliAODTrack *track=(AliAODTrack*)vtrack;
115 if ( !(track->GetStatus() & AliVTrack::kTOFout) || !(track->GetStatus() & AliVTrack::kTIME) ) return -999.;
118 AliAODPid *pidObj = track->GetDetPid();
119 if (!pidObj) return -999.;
120 Double_t tofTime=pidObj->GetTOFsignal();
121 Double_t expTime=fTOFResponse.GetExpectedSignal((AliVTrack*)vtrack,type);
122 Double_t sigmaTOFPid[AliPID::kSPECIES];
123 pidObj->GetTOFpidResolution(sigmaTOFPid);
124 AliAODEvent *event=(AliAODEvent*)track->GetAODEvent();
125 if (event) { // protection if the user didn't call GetTrack, which sets the internal pointer
126 AliTOFHeader* tofH=(AliTOFHeader*)event->GetTOFHeader();
127 if (tofH && (TMath::Abs(sigmaTOFPid[0]) <= 1.E-16) ) { // new AOD
128 sigTOF=fTOFResponse.GetExpectedSigma(track->P(),expTime,AliPID::ParticleMassZ(type)); //fTOFResponse is set in InitialiseEvent
129 tofTime -= fTOFResponse.GetStartTime(vtrack->P());
133 AliError("pointer to AliAODEvent not found, please call GetTrack to set it");
136 if (oldAod) { // old AOD
137 if (type <= AliPID::kProton) {
138 sigTOF=sigmaTOFPid[type];
139 } else return -998.; // light nuclei cannot be supported on old AOD because we don't have timeZero resolution
141 if (sigTOF>0) return (tofTime - expTime)/sigTOF;