Bug corrected.
[u/mrichter/AliRoot.git] / STEER / AliAODpidUtil.cxx
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1423bac9 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/* $Id: AliAODpidUtil.cxx 38329 2010-01-17 19:17:24Z hristov $ */
17
18//-----------------------------------------------------------------
19// Implementation of the combined PID class
20// For the AOD Class
21// containing information on the particle identification
22// Origin: Rosa Romita, GSI, r.romita@gsi.de
23//-----------------------------------------------------------------
24
25#include "AliLog.h"
26#include "AliPID.h"
27#include "AliAODpidUtil.h"
28#include "AliAODEvent.h"
29#include "AliAODTrack.h"
30#include "AliAODPid.h"
31#include "AliTRDPIDResponse.h"
1c2fc6e0 32#include "AliESDtrack.h"
1423bac9 33
34ClassImp(AliAODpidUtil)
35
1c2fc6e0 36 Int_t AliAODpidUtil::MakePID(AliAODTrack *track,Double_t *p) const {
1423bac9 37 //
38 // Calculate probabilities for all detectors, except if TPConly==kTRUE
39 // and combine PID
40 //
41 // Option TPConly==kTRUE is used during reconstruction,
42 // because ITS tracking uses TPC pid
43 // HMPID and TRD pid are done in detector reconstructors
44 //
45
46 /*
47 Float_t TimeZeroTOF = 0;
48 if (subtractT0)
49 TimeZeroTOF = event->GetT0();
50 */
51 Int_t ns=AliPID::kSPECIES;
52 Double_t tpcPid[AliPID::kSPECIES];
53 MakeTPCPID(track,tpcPid);
54 Double_t itsPid[AliPID::kSPECIES];
55 Double_t tofPid[AliPID::kSPECIES];
56 Double_t trdPid[AliPID::kSPECIES];
57 MakeITSPID(track,itsPid);
1c2fc6e0 58 MakeTOFPID(track,tofPid);
1423bac9 59 //MakeHMPIDPID(track);
60 MakeTRDPID(track,trdPid);
61 for (Int_t j=0; j<ns; j++) {
62 p[j]=tpcPid[j]*itsPid[j]*tofPid[j]*trdPid[j];
63 }
64
65 return 0;
66}
67//_________________________________________________________________________
68void AliAODpidUtil::MakeTPCPID(AliAODTrack *track,Double_t *p) const
69{
70 //
71 // TPC pid using bethe-bloch and gaussian response
72 //
73
1c2fc6e0 74 if ((track->GetStatus()&AliESDtrack::kTPCin )==0) return;
1c2fc6e0 75
1423bac9 76 Double_t mom = track->P();
77 AliAODPid *pidObj = track->GetDetPid();
78 if (pidObj) mom = pidObj->GetTPCmomentum();
597b16d8 79 UShort_t nTPCClus=pidObj->GetTPCsignalN();
1423bac9 80
81 Double_t dedx=pidObj->GetTPCsignal();
82 Bool_t mismatch=kTRUE;
83
84 for (Int_t j=0; j<AliPID::kSPECIES; j++) {
85 AliPID::EParticleType type=AliPID::EParticleType(j);
86 Double_t bethe=fTPCResponse.GetExpectedSignal(mom,type);
1c2fc6e0 87 Double_t sigma=fTPCResponse.GetExpectedSigma(mom,nTPCClus,type);
1423bac9 88 if (TMath::Abs(dedx-bethe) > fRange*sigma) {
89 p[j]=TMath::Exp(-0.5*fRange*fRange)/sigma;
90 } else {
91 p[j]=TMath::Exp(-0.5*(dedx-bethe)*(dedx-bethe)/(sigma*sigma))/sigma;
92 mismatch=kFALSE;
93 }
94
95 }
96
97 if (mismatch)
98 for (Int_t j=0; j<AliPID::kSPECIES; j++) p[j]=1/AliPID::kSPECIES;
99
100
101 return;
102}
103//_________________________________________________________________________
104void AliAODpidUtil::MakeITSPID(AliAODTrack *track,Double_t *p) const
105{
106 //
107 // ITS PID
108 // 1) Truncated mean method
109 //
110
111
1c2fc6e0 112 if ((track->GetStatus()&AliESDtrack::kITSin)==0) return;
113 UChar_t clumap=track->GetITSClusterMap();
114 Int_t nPointsForPid=0;
115 for(Int_t i=2; i<6; i++){
116 if(clumap&(1<<i)) ++nPointsForPid;
117 }
15e979c9 118 if(nPointsForPid<3) { // track not to be used for combined PID purposes
119 for (Int_t j=0; j<AliPID::kSPECIES; j++)
120 p[j] = 1./AliPID::kSPECIES;
121 return;
122 }
1423bac9 123 Double_t mom=track->P();
124 AliAODPid *pidObj = track->GetDetPid();
125
15e979c9 126 Double_t dedx = pidObj->GetITSsignal();
127 Bool_t mismatch = kTRUE;
128 Bool_t isSA = kTRUE;
129 if(track->GetStatus() & AliESDtrack::kTPCin){
130 isSA = kFALSE;
131 if (pidObj)
132 mom = pidObj->GetTPCmomentum();
133 }
1423bac9 134 for (Int_t j=0; j<AliPID::kSPECIES; j++) {
15e979c9 135 Double_t mass = AliPID::ParticleMass(j);//GeV/c^2
136 Double_t bethe = fITSResponse.Bethe(mom,mass);
137 Double_t sigma = fITSResponse.GetResolution(bethe,nPointsForPid,isSA);
1423bac9 138 if (TMath::Abs(dedx-bethe) > fRange*sigma) {
139 p[j]=TMath::Exp(-0.5*fRange*fRange)/sigma;
140 } else {
141 p[j]=TMath::Exp(-0.5*(dedx-bethe)*(dedx-bethe)/(sigma*sigma))/sigma;
142 mismatch=kFALSE;
143 }
144
145 // Check for particles heavier than (AliPID::kSPECIES - 1)
146
147 }
148
149 if (mismatch)
150 for (Int_t j=0; j<AliPID::kSPECIES; j++) p[j]=1./AliPID::kSPECIES;
151
152 return;
153
154}
155//_________________________________________________________________________
1c2fc6e0 156void AliAODpidUtil::MakeTOFPID(AliAODTrack *track, Double_t *p) const
1423bac9 157{
158 //
159 // TOF PID using gaussian response
160 //
1c2fc6e0 161 if ((track->GetStatus()&AliESDtrack::kTOFout )==0) return;
162 if ((track->GetStatus()&AliESDtrack::kTIME )==0) return;
163 if ((track->GetStatus()&AliESDtrack::kTOFpid )==0) return;
1423bac9 164
165 Double_t time[AliPID::kSPECIESN];
166 Double_t sigma[AliPID::kSPECIESN];
167 AliAODPid *pidObj = track->GetDetPid();
168 pidObj->GetIntegratedTimes(time);
169
170 for (Int_t iPart = 0; iPart < AliPID::kSPECIES; iPart++) {
171 sigma[iPart] = fTOFResponse.GetExpectedSigma(track->P(),time[iPart],AliPID::ParticleMass(iPart));
172 }
173
174 AliDebugGeneral("AliESDpid::MakeTOFPID",2,
175 Form("Expected TOF signals [ps]: %f %f %f %f %f",
176 time[AliPID::kElectron],
177 time[AliPID::kMuon],
178 time[AliPID::kPion],
179 time[AliPID::kKaon],
180 time[AliPID::kProton]));
181
182 AliDebugGeneral("AliESDpid::MakeTOFPID",2,
183 Form("Expected TOF std deviations [ps]: %f %f %f %f %f",
184 sigma[AliPID::kElectron],
185 sigma[AliPID::kMuon],
186 sigma[AliPID::kPion],
187 sigma[AliPID::kKaon],
188 sigma[AliPID::kProton]
189 ));
190
1c2fc6e0 191 Double_t tof = pidObj->GetTOFsignal();
1423bac9 192
193 Bool_t mismatch = kTRUE;
194 for (Int_t j=0; j<AliPID::kSPECIES; j++) {
195 Double_t sig = sigma[j];
196 if (TMath::Abs(tof-time[j]) > fRange*sig) {
197 p[j] = TMath::Exp(-0.5*fRange*fRange)/sig;
198 } else
199 p[j] = TMath::Exp(-0.5*(tof-time[j])*(tof-time[j])/(sig*sig))/sig;
200
201 // Check the mismatching
202 Double_t mass = AliPID::ParticleMass(j);
203 Double_t pm = fTOFResponse.GetMismatchProbability(track->P(),mass);
204 if (p[j]>pm) mismatch = kFALSE;
205
206 // Check for particles heavier than (AliPID::kSPECIES - 1)
207
208 }
209
210 if (mismatch)
211 for (Int_t j=0; j<AliPID::kSPECIES; j++) p[j]=1/AliPID::kSPECIES;
212
213 return;
214}
215//_________________________________________________________________________
216void AliAODpidUtil::MakeTRDPID(AliAODTrack *track,Double_t *p) const
217{
218
219 // Method to recalculate the TRD PID probabilities
1c2fc6e0 220 if ((track->GetStatus()&AliESDtrack::kTRDout )==0) return;
221
1423bac9 222 AliAODPid *pidObj = track->GetDetPid();
223 Float_t *mom=pidObj->GetTRDmomentum();
1c2fc6e0 224 Int_t ntracklets=0;
225 for(Int_t iPl=0;iPl<6;iPl++){
226 if(mom[iPl]>0.) ntracklets++;
227 }
228 if(ntracklets<4) return;
229
230 Double_t* dedx=pidObj->GetTRDsignal();
1423bac9 231 Bool_t norm=kTRUE;
30d69fa9 232 fTRDResponse.GetResponse(pidObj->GetTRDnSlices(),dedx,mom,p,norm);
1423bac9 233 return;
234}