1 /**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
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 **************************************************************************/
17 //-----------------------------------------------------------------
18 // Base class for combining PID of different detectors //
19 // (user selected) and compute Bayesian probabilities //
22 // Origin: Pietro Antonioli, INFN-BO Pietro.Antonioli@cern.ch //
24 //-----------------------------------------------------------------
28 #include <AliVTrack.h>
31 #include <AliPIDResponse.h>
33 #include "AliPIDCombined.h"
38 #include "AliOADBContainer.h"
40 // initialize static members
41 TH2F* AliPIDCombined::fDefaultPriorsTPC[5];
43 ClassImp(AliPIDCombined);
45 AliPIDCombined::AliPIDCombined():
46 TNamed("CombinedPID","CombinedPID"),
48 fRejectMismatchMask(0x7F),
50 fSelectedSpecies(AliPID::kSPECIES),
51 fUseDefaultTPCPriors(kFALSE)
54 // default constructor
56 for (Int_t i=0;i<AliPID::kSPECIES+AliPID::kSPECIESLN;i++) fPriorsDistributions[i]=NULL;
57 AliLog::SetClassDebugLevel("AliPIDCombined",10);
60 //-------------------------------------------------------------------------------------------------
61 AliPIDCombined::AliPIDCombined(const TString& name,const TString& title):
64 fRejectMismatchMask(0x7F),
66 fSelectedSpecies(AliPID::kSPECIES),
67 fUseDefaultTPCPriors(kFALSE)
70 // default constructor with name and title
72 for (Int_t i=0;i<AliPID::kSPECIES+AliPID::kSPECIESLN;i++) fPriorsDistributions[i]=NULL;
73 AliLog::SetClassDebugLevel("AliPIDCombined",10);
77 //-------------------------------------------------------------------------------------------------
78 AliPIDCombined::~AliPIDCombined() {
80 for(Int_t i=0;i < AliPID::kSPECIES+AliPID::kSPECIESLN;i++){
81 if(fPriorsDistributions[i])
82 delete fPriorsDistributions[i];
86 //-------------------------------------------------------------------------------------------------
87 void AliPIDCombined::SetPriorDistribution(AliPID::EParticleType type,TH1F *prior) {
88 if ( (type < 0) || ( type >= (AliPID::kSPECIESN+AliPID::kSPECIESLN) ) ){
89 AliError(Form("Invalid EParticleType setting prior (offending type: %d)",type));
93 Int_t i = (Int_t)type;
94 if (i >= AliPID::kSPECIES ) {
95 if (i < (Int_t)AliPID::kDeuteron) {
96 AliError(Form("Invalid EParticleType setting prior. Type: %d (neutral) not supported",i));
98 } else i -= (AliPID::kSPECIESN-AliPID::kSPECIES);
100 if (i>(AliPID::kSPECIES+AliPID::kSPECIESLN)) { // coverity fix (to put it mildly....)
101 AliError(Form("Unexpected EParticleType setting prior. Type: %d (neutral) not supported",i));
104 if (fPriorsDistributions[i]) {
105 delete fPriorsDistributions[i];
107 fPriorsDistributions[i]=new TH1F(*prior);
111 //-------------------------------------------------------------------------------------------------
112 UInt_t AliPIDCombined::ComputeProbabilities(const AliVTrack *track, const AliPIDResponse *response, Double_t* bayesProbabilities) const {
113 Double_t pITS[fSelectedSpecies];
114 Double_t pTPC[fSelectedSpecies];
115 Double_t pTRD[fSelectedSpecies];
116 Double_t pTOF[fSelectedSpecies];
117 Double_t pHMPID[fSelectedSpecies];
118 Double_t pEMCAL[fSelectedSpecies];
119 Double_t pPHOS[fSelectedSpecies];
120 for (Int_t i=0;i<fSelectedSpecies;i++) {
130 AliPIDResponse::EDetPidStatus status=AliPIDResponse::kDetNoSignal;
131 Double_t p[fSelectedSpecies];
132 memset(p,0,sizeof(Double_t)*fSelectedSpecies);
134 // getting probability distributions for selected detectors only
135 if (fDetectorMask & AliPIDResponse::kDetITS) {
136 status = response->ComputeITSProbability(track, fSelectedSpecies, pITS);
137 SetCombinedStatus(status,&usedMask,AliPIDResponse::kDetITS,pITS);
140 if (fDetectorMask & AliPIDResponse::kDetTPC) {
141 status = response->ComputeTPCProbability(track, fSelectedSpecies, pTPC);
142 SetCombinedStatus(status,&usedMask,AliPIDResponse::kDetTPC,pTPC);
146 if (fDetectorMask & AliPIDResponse::kDetTRD) {
147 status = response->ComputeTRDProbability(track, fSelectedSpecies, pTRD);
148 SetCombinedStatus(status,&usedMask,AliPIDResponse::kDetTRD,pTRD);
151 if (fDetectorMask & AliPIDResponse::kDetTOF) {
152 status = response->ComputeTOFProbability(track, fSelectedSpecies, pTOF);
153 SetCombinedStatus(status,&usedMask,AliPIDResponse::kDetTOF,pTOF);
156 if (fDetectorMask & AliPIDResponse::kDetHMPID) {
157 status = response->ComputeHMPIDProbability(track, fSelectedSpecies, pHMPID);
158 SetCombinedStatus(status,&usedMask,AliPIDResponse::kDetHMPID,pHMPID);
162 if (fDetectorMask & AliPIDResponse::kDetEMCAL) {
163 status = response->ComputeEMCALProbability(track, fSelectedSpecies, pEMCAL);
164 SetCombinedStatus(status,&usedMask,AliPIDResponse::kDetEMCAL,pEMCAL);
168 if (fDetectorMask & AliPIDResponse::kDetPHOS) {
169 status = response->ComputePHOSProbability(track, fSelectedSpecies, pPHOS);
170 SetCombinedStatus(status,&usedMask,AliPIDResponse::kDetPHOS,pPHOS);
174 for (Int_t i =0; i<fSelectedSpecies; i++){
175 p[i] = pITS[i]*pTPC[i]*pTRD[i]*pTOF[i]*pHMPID[i]*pEMCAL[i]*pPHOS[i];
177 Double_t priors[fSelectedSpecies];
178 memset(priors,0,fSelectedSpecies*sizeof(Double_t));
180 GetPriors(track,priors,response->GetCurrentCentrality());
182 // for the moment we have three cases
183 // TPC+TRD --> apply TRD propagation factors
184 // TPC+TOF --> apply TOF propagation factors
185 // TPC+TRD+TOF --> apply TOF propagation factors
186 // apply tof matching efficiency to priors if TOF joined PID for this track
187 if(fUseDefaultTPCPriors) {
188 Double_t pt=TMath::Abs(track->Pt());
189 if ( (usedMask & AliPIDResponse::kDetTOF) == AliPIDResponse::kDetTOF ){ // TOF is the outer having prop. factors for the moment
190 Float_t kaonTOFfactor = 0.1;
191 if(pt > 0.35) kaonTOFfactor = 1 - TMath::Exp(-TMath::Power(pt,4.19618E-07)/5.68017E-01)*TMath::Power(pt,-1.50705);
192 Float_t protonTOFfactor = 0.1;
193 if(pt > 0.4) protonTOFfactor = 1 - TMath::Exp(-TMath::Power(pt,3.30978)/8.57396E-02)*TMath::Power(pt,-4.42661E-01);
195 if(track->Charge() < 0){ // for negative tracks
196 kaonTOFfactor *= 1 - TMath::Exp(-TMath::Power(pt,4.87912E-07)/3.26431E-01)*TMath::Power(pt,-1.22893);
197 protonTOFfactor *= 1 - TMath::Exp(-TMath::Power(pt,2.00575E-07)/4.95605E-01)*TMath::Power(pt,-6.71305E-01);
199 p[3] *= kaonTOFfactor;
200 p[4] *= protonTOFfactor;
203 if ( (usedMask & AliPIDResponse::kDetTRD)==AliPIDResponse::kDetTRD ) {
204 Float_t electronTRDfactor=0.1;
205 Float_t kaonTRDfactor = 0.1;
206 Float_t protonTRDfactor = 0.1;
208 if(track->Charge() > 0){
210 if(pt > 0.25) electronTRDfactor = 1 - TMath::Exp(-TMath::Power(pt,5.13315e-03)/2.11145e-01)*TMath::Power(pt,-2.97659e+00);
211 if(pt > 0.35) kaonTRDfactor = 1 - TMath::Exp(-TMath::Power(pt,-4.29549e-02)/4.87989e-01)*TMath::Power(pt,-1.54270e+00);
212 if(pt > 0.35) protonTRDfactor = 1 - TMath::Exp(-TMath::Power(pt,2.81238e+00)/7.57082e-02)*TMath::Power(pt,-8.12595e-01);
215 if(track->Charge() < 0){
217 if(pt > 0.25) electronTRDfactor = 1 - TMath::Exp(-TMath::Power(pt,2.45537e-02)/1.90397e-01)*TMath::Power(pt,-3.33121e+00);
218 if(pt > 0.35) kaonTRDfactor = 1 - TMath::Exp(-TMath::Power(pt, -3.42831e-03)/5.57013e-01)*TMath::Power(pt,-1.39202e+00);
219 if(pt > 0.35) protonTRDfactor = 1 - TMath::Exp(-TMath::Power(pt,3.36631e+00)/7.18819e-02)*TMath::Power(pt,-2.00577e-01);
221 // what about electrons
222 p[0] *= electronTRDfactor;
223 p[3] *= kaonTRDfactor;
224 p[4] *= protonTRDfactor;
226 } // end of detectors inner than TOF
227 } // end of fUseDefaultTPCPriors
228 } // end of use priors
229 else { for (Int_t i=0;i<fSelectedSpecies;i++) priors[i]=1.;}
230 ComputeBayesProbabilities(bayesProbabilities,p,priors);
235 //-------------------------------------------------------------------------------------------------
236 void AliPIDCombined::GetPriors(const AliVTrack *track, Double_t* p,Float_t centrality) const {
239 // get priors from distributions
242 Double_t pt=TMath::Abs(track->Pt());
244 if(fUseDefaultTPCPriors){ // use default priors if requested
245 Float_t usedCentr = centrality+5*(centrality>0);
246 if(usedCentr < -0.99) usedCentr = -0.99;
247 else if(usedCentr > 99) usedCentr = 99;
248 if(pt > 9.99) pt = 9.99;
249 else if(pt < 0.01) pt = 0.01;
251 for(Int_t i=0;i<5;i++) p[i] = fDefaultPriorsTPC[i]->Interpolate(usedCentr,pt);
256 Double_t sumPriors = 0;
257 for (Int_t i=0;i<fSelectedSpecies;++i){
258 if (fPriorsDistributions[i]){
259 p[i]=fPriorsDistributions[i]->Interpolate(pt);
267 // normalizing priors
268 if (sumPriors == 0) return;
269 for (Int_t i=0;i<fSelectedSpecies;++i){
274 //-------------------------------------------------------------------------------------------------
275 void AliPIDCombined::GetPriors(const AliVTrack *track,Double_t* p,const AliPIDResponse *response,UInt_t detUsed) const{
278 // get priors from distributions
280 Double_t pt=TMath::Abs(track->Pt());
282 if(fUseDefaultTPCPriors){ // use default priors if requested
283 Float_t usedCentr = response->GetCurrentCentrality()+5*(response->GetCurrentCentrality()>0);
284 if(usedCentr < -0.99) usedCentr = -0.99;
285 else if(usedCentr > 99) usedCentr = 99;
286 if(pt > 9.99) pt = 9.99;
287 else if(pt < 0.01) pt = 0.01;
289 for(Int_t i=0;i<5;i++) p[i] = fDefaultPriorsTPC[i]->Interpolate(usedCentr,pt);
291 // Extra factor if TOF matching was required
292 if(detUsed & AliPIDResponse::kDetTOF){
293 Float_t kaonTOFfactor = 0.1;
294 if(pt > 0.35) kaonTOFfactor = 1 - TMath::Exp(-TMath::Power(pt,4.19618E-07)/5.68017E-01)*TMath::Power(pt,-1.50705);
295 Float_t protonTOFfactor = 0.1;
296 if(pt > 0.4) protonTOFfactor = 1 - TMath::Exp(-TMath::Power(pt,3.30978)/8.57396E-02)*TMath::Power(pt,-4.42661E-01);
298 if(track->Charge() < 0){ // for negative tracks
299 kaonTOFfactor *= 1 - TMath::Exp(-TMath::Power(pt,4.87912E-07)/3.26431E-01)*TMath::Power(pt,-1.22893);
300 protonTOFfactor *= 1 - TMath::Exp(-TMath::Power(pt,2.00575E-07)/4.95605E-01)*TMath::Power(pt,-6.71305E-01);
303 p[3] *= kaonTOFfactor;
304 p[4] *= protonTOFfactor;
311 Double_t sumPriors = 0;
312 for (Int_t i=0;i<fSelectedSpecies;++i){
313 if (fPriorsDistributions[i]){
314 p[i]=fPriorsDistributions[i]->Interpolate(pt);
322 // normalizing priors
323 if (sumPriors == 0) return;
324 for (Int_t i=0;i<fSelectedSpecies;++i){
329 //-------------------------------------------------------------------------------------------------
330 void AliPIDCombined::ComputeBayesProbabilities(Double_t* probabilities, const Double_t* probDensity, const Double_t* prior) const {
334 // calculate Bayesian probabilities
337 for (Int_t i = 0; i < fSelectedSpecies; i++) {
338 sum += probDensity[i] * prior[i];
342 AliError("Invalid probability densities or priors");
343 for (Int_t i = 0; i < fSelectedSpecies; i++) probabilities[i] = -1;
346 for (Int_t i = 0; i < fSelectedSpecies; i++) {
347 probabilities[i] = probDensity[i] * prior[i] / sum;
353 //----------------------------------------------------------------------------------------
354 void AliPIDCombined::SetCombinedStatus(AliPIDResponse::EDetPidStatus status, UInt_t *maskDetIn, AliPIDResponse::EDetCode bit, Double_t* p) const {
356 case AliPIDResponse::kDetNoSignal:
358 case AliPIDResponse::kDetPidOk:
359 *maskDetIn = *maskDetIn | bit;
361 case AliPIDResponse::kDetMismatch:
362 if ( fRejectMismatchMask & bit) for (Int_t j=0;j<fSelectedSpecies;j++) p[j]=1./fSelectedSpecies;
363 else *maskDetIn = *maskDetIn | bit;
369 //----------------------------------------------------------------------------------------
370 void AliPIDCombined::SetDefaultTPCPriors(){
372 fUseDefaultTPCPriors = kTRUE;
374 TString oadbfilename("$ALICE_ROOT/OADB/COMMON/PID/data/");
375 oadbfilename += "/PIDdefaultPriors.root";
376 TFile * foadb = TFile::Open(oadbfilename.Data());
377 if(!foadb->IsOpen()) AliFatal(Form("Cannot open OADB file %s", oadbfilename.Data()));
379 AliOADBContainer * priorsContainer = (AliOADBContainer*) foadb->Get("priorsTPC");
380 if (!priorsContainer) AliFatal("Cannot fetch OADB container for Priors");
382 const char *namespecies[5] = {"El","Mu","Pi","Ka","Pr"};
385 for(Int_t i=0;i < 5;i++){
386 snprintf(name,99,"hDefault%sPriors",namespecies[i]);
387 fDefaultPriorsTPC[i] = (TH2F*) priorsContainer->GetDefaultObject(name);
388 if (!fDefaultPriorsTPC[i]) AliFatal(Form("Cannot find priors for %s", namespecies[i]));