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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" | |
32 | #include "AliESDtrack.h" | |
33 | ||
34 | ClassImp(AliAODpidUtil) | |
35 | ||
36 | Int_t AliAODpidUtil::MakePID(const AliAODTrack *track,Double_t *p) const { | |
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); | |
58 | MakeTOFPID(track,tofPid); | |
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(const AliAODTrack *track,Double_t *p) const | |
69 | { | |
70 | // | |
71 | // TPC pid using bethe-bloch and gaussian response | |
72 | // | |
73 | ||
74 | if ((track->GetStatus()&AliESDtrack::kTPCin )==0) return; | |
75 | ||
76 | AliAODPid *pidObj = track->GetDetPid(); | |
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 | ||
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); | |
91 | Double_t sigma=fTPCResponse.GetExpectedSigma(mom,nTPCClus,type); | |
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) | |
102 | for (Int_t j=0; j<AliPID::kSPECIES; j++) p[j]=1./AliPID::kSPECIES; | |
103 | ||
104 | ||
105 | return; | |
106 | } | |
107 | //_________________________________________________________________________ | |
108 | void AliAODpidUtil::MakeITSPID(const AliAODTrack *track,Double_t *p) const | |
109 | { | |
110 | // | |
111 | // ITS PID | |
112 | // 1) Truncated mean method | |
113 | // | |
114 | ||
115 | ||
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 | } | |
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 | } | |
127 | Double_t mom=track->P(); | |
128 | AliAODPid *pidObj = track->GetDetPid(); | |
129 | ||
130 | Double_t dedx = 0.; | |
131 | if (pidObj) { | |
132 | dedx = pidObj->GetITSsignal(); | |
133 | } | |
134 | ||
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 | } | |
142 | for (Int_t j=0; j<AliPID::kSPECIES; j++) { | |
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); | |
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 | //_________________________________________________________________________ | |
164 | void AliAODpidUtil::MakeTOFPID(const AliAODTrack *track, Double_t *p) const | |
165 | { | |
166 | // | |
167 | // TOF PID using gaussian response | |
168 | // | |
169 | if ((track->GetStatus()&AliESDtrack::kTOFout )==0) return; | |
170 | if ((track->GetStatus()&AliESDtrack::kTIME )==0) return; | |
171 | if ((track->GetStatus()&AliESDtrack::kTOFpid )==0) return; | |
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 | ||
199 | Double_t tof = pidObj->GetTOFsignal(); | |
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) | |
219 | for (Int_t j=0; j<AliPID::kSPECIES; j++) p[j]=1./AliPID::kSPECIES; | |
220 | ||
221 | return; | |
222 | } | |
223 | //_________________________________________________________________________ | |
224 | void AliAODpidUtil::MakeTRDPID(const AliAODTrack *track,Double_t *p) const | |
225 | { | |
226 | ComputeTRDProbability(track, AliPID::kSPECIES, p); | |
227 | return; | |
228 | } | |
229 |