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[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
03945936 36 Int_t AliAODpidUtil::MakePID(const 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//_________________________________________________________________________
5e6a3170 68void AliAODpidUtil::MakeTPCPID(const AliAODTrack *track,Double_t *p) const
1423bac9 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 AliAODPid *pidObj = track->GetDetPid();
a67eebca 77 Double_t mom = track->P();
78 Double_t dedx = 0.;
79 UShort_t nTPCClus = 0;
80 if (pidObj) {
81 nTPCClus = pidObj->GetTPCsignalN();
82 dedx = pidObj->GetTPCsignal();
83 mom = pidObj->GetTPCmomentum();
84 }
85
1423bac9 86 Bool_t mismatch=kTRUE;
87
88 for (Int_t j=0; j<AliPID::kSPECIES; j++) {
89 AliPID::EParticleType type=AliPID::EParticleType(j);
90 Double_t bethe=fTPCResponse.GetExpectedSignal(mom,type);
1c2fc6e0 91 Double_t sigma=fTPCResponse.GetExpectedSigma(mom,nTPCClus,type);
1423bac9 92 if (TMath::Abs(dedx-bethe) > fRange*sigma) {
93 p[j]=TMath::Exp(-0.5*fRange*fRange)/sigma;
94 } else {
95 p[j]=TMath::Exp(-0.5*(dedx-bethe)*(dedx-bethe)/(sigma*sigma))/sigma;
96 mismatch=kFALSE;
97 }
98
99 }
100
101 if (mismatch)
77638021 102 for (Int_t j=0; j<AliPID::kSPECIES; j++) p[j]=1./AliPID::kSPECIES;
1423bac9 103
104
105 return;
106}
107//_________________________________________________________________________
5e6a3170 108void AliAODpidUtil::MakeITSPID(const AliAODTrack *track,Double_t *p) const
1423bac9 109{
110 //
111 // ITS PID
112 // 1) Truncated mean method
113 //
114
115
1c2fc6e0 116 if ((track->GetStatus()&AliESDtrack::kITSin)==0) return;
117 UChar_t clumap=track->GetITSClusterMap();
118 Int_t nPointsForPid=0;
119 for(Int_t i=2; i<6; i++){
120 if(clumap&(1<<i)) ++nPointsForPid;
121 }
15e979c9 122 if(nPointsForPid<3) { // track not to be used for combined PID purposes
123 for (Int_t j=0; j<AliPID::kSPECIES; j++)
124 p[j] = 1./AliPID::kSPECIES;
125 return;
126 }
1423bac9 127 Double_t mom=track->P();
128 AliAODPid *pidObj = track->GetDetPid();
129
0f9da745 130 Double_t dedx = 0.;
131 if (pidObj) {
132 dedx = pidObj->GetITSsignal();
133 }
134
15e979c9 135 Bool_t mismatch = kTRUE;
136 Bool_t isSA = kTRUE;
137 if(track->GetStatus() & AliESDtrack::kTPCin){
138 isSA = kFALSE;
139 if (pidObj)
140 mom = pidObj->GetTPCmomentum();
141 }
1423bac9 142 for (Int_t j=0; j<AliPID::kSPECIES; j++) {
15e979c9 143 Double_t mass = AliPID::ParticleMass(j);//GeV/c^2
144 Double_t bethe = fITSResponse.Bethe(mom,mass);
145 Double_t sigma = fITSResponse.GetResolution(bethe,nPointsForPid,isSA);
1423bac9 146 if (TMath::Abs(dedx-bethe) > fRange*sigma) {
147 p[j]=TMath::Exp(-0.5*fRange*fRange)/sigma;
148 } else {
149 p[j]=TMath::Exp(-0.5*(dedx-bethe)*(dedx-bethe)/(sigma*sigma))/sigma;
150 mismatch=kFALSE;
151 }
152
153 // Check for particles heavier than (AliPID::kSPECIES - 1)
154
155 }
156
157 if (mismatch)
158 for (Int_t j=0; j<AliPID::kSPECIES; j++) p[j]=1./AliPID::kSPECIES;
159
160 return;
161
162}
163//_________________________________________________________________________
5e6a3170 164void AliAODpidUtil::MakeTOFPID(const AliAODTrack *track, Double_t *p) const
1423bac9 165{
166 //
167 // TOF PID using gaussian response
168 //
1c2fc6e0 169 if ((track->GetStatus()&AliESDtrack::kTOFout )==0) return;
170 if ((track->GetStatus()&AliESDtrack::kTIME )==0) return;
171 if ((track->GetStatus()&AliESDtrack::kTOFpid )==0) return;
1423bac9 172
173 Double_t time[AliPID::kSPECIESN];
174 Double_t sigma[AliPID::kSPECIESN];
175 AliAODPid *pidObj = track->GetDetPid();
176 pidObj->GetIntegratedTimes(time);
177
178 for (Int_t iPart = 0; iPart < AliPID::kSPECIES; iPart++) {
179 sigma[iPart] = fTOFResponse.GetExpectedSigma(track->P(),time[iPart],AliPID::ParticleMass(iPart));
180 }
181
182 AliDebugGeneral("AliESDpid::MakeTOFPID",2,
183 Form("Expected TOF signals [ps]: %f %f %f %f %f",
184 time[AliPID::kElectron],
185 time[AliPID::kMuon],
186 time[AliPID::kPion],
187 time[AliPID::kKaon],
188 time[AliPID::kProton]));
189
190 AliDebugGeneral("AliESDpid::MakeTOFPID",2,
191 Form("Expected TOF std deviations [ps]: %f %f %f %f %f",
192 sigma[AliPID::kElectron],
193 sigma[AliPID::kMuon],
194 sigma[AliPID::kPion],
195 sigma[AliPID::kKaon],
196 sigma[AliPID::kProton]
197 ));
198
1c2fc6e0 199 Double_t tof = pidObj->GetTOFsignal();
1423bac9 200
201 Bool_t mismatch = kTRUE;
202 for (Int_t j=0; j<AliPID::kSPECIES; j++) {
203 Double_t sig = sigma[j];
204 if (TMath::Abs(tof-time[j]) > fRange*sig) {
205 p[j] = TMath::Exp(-0.5*fRange*fRange)/sig;
206 } else
207 p[j] = TMath::Exp(-0.5*(tof-time[j])*(tof-time[j])/(sig*sig))/sig;
208
209 // Check the mismatching
210 Double_t mass = AliPID::ParticleMass(j);
211 Double_t pm = fTOFResponse.GetMismatchProbability(track->P(),mass);
212 if (p[j]>pm) mismatch = kFALSE;
213
214 // Check for particles heavier than (AliPID::kSPECIES - 1)
215
216 }
217
218 if (mismatch)
77638021 219 for (Int_t j=0; j<AliPID::kSPECIES; j++) p[j]=1./AliPID::kSPECIES;
1423bac9 220
221 return;
222}
223//_________________________________________________________________________
5e6a3170 224void AliAODpidUtil::MakeTRDPID(const AliAODTrack *track,Double_t *p) const
1423bac9 225{
226
227 // Method to recalculate the TRD PID probabilities
1c2fc6e0 228 if ((track->GetStatus()&AliESDtrack::kTRDout )==0) return;
229
1423bac9 230 AliAODPid *pidObj = track->GetDetPid();
231 Float_t *mom=pidObj->GetTRDmomentum();
1c2fc6e0 232 Int_t ntracklets=0;
233 for(Int_t iPl=0;iPl<6;iPl++){
234 if(mom[iPl]>0.) ntracklets++;
235 }
236 if(ntracklets<4) return;
237
238 Double_t* dedx=pidObj->GetTRDsignal();
1423bac9 239 Bool_t norm=kTRUE;
30d69fa9 240 fTRDResponse.GetResponse(pidObj->GetTRDnSlices(),dedx,mom,p,norm);
1423bac9 241 return;
242}