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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 | |
34 | ClassImp(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 | //_________________________________________________________________________ | |
68 | void 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; |
75 | UShort_t nTPCClus=track->GetTPCNcls(); | |
76 | ||
1423bac9 | 77 | Double_t mom = track->P(); |
78 | AliAODPid *pidObj = track->GetDetPid(); | |
79 | if (pidObj) mom = pidObj->GetTPCmomentum(); | |
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 | //_________________________________________________________________________ | |
104 | void 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 | 156 | void 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 | //_________________________________________________________________________ | |
216 | void 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 | } |