]> git.uio.no Git - u/mrichter/AliRoot.git/blame - PWG/Tools/AliHelperPID.cxx
git://git.uio.no / u / mrichter / AliRoot.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
:x
[u/mrichter/AliRoot.git] / PWG / Tools / AliHelperPID.cxx
CommitLineData
32e49607 1
2/**************************************************************************
3 * Copyright(c) 1998-2009, ALICE Experiment at CERN, All rights reserved. *
4 * *
5 * Author: The ALICE Off-line Project. *
6 * Contributors are mentioned in the code where appropriate. *
7 * *
8 * Permission to use, copy, modify and distribute this software and its *
9 * documentation strictly for non-commercial purposes is hereby granted *
10 * without fee, provided that the above copyright notice appears in all *
11 * copies and that both the copyright notice and this permission notice *
12 * appear in the supporting documentation. The authors make no claims *
13 * about the suitability of this software for any purpose. It is *
14 * provided "as is" without express or implied warranty. *
15 **************************************************************************/
16
17//-----------------------------------------------------------------
18// AliHelperPID class
19//-----------------------------------------------------------------
20
21#include "AliHelperPID.h"
22#include "AliVEvent.h"
23#include "AliAODEvent.h"
24#include "AliMCEvent.h"
25#include "AliMCEventHandler.h"
26#include "TH1F.h"
27#include "TH2F.h"
28#include "TList.h"
29#include "AliStack.h"
30#include "AliVTrack.h"
31#include "TParticle.h"
32#include "AliAODMCParticle.h"
33#include "AliPIDResponse.h"
d2062f6b 34#include "AliPIDCombined.h"
32e49607 35#include "AliAnalysisManager.h"
36#include "AliInputEventHandler.h"
37
38using namespace AliHelperPIDNameSpace;
39using namespace std;
40
41const char * kPIDTypeName[]={"TPC","TOF","TPC-TOF"} ;
d2062f6b 42const char * kDetectorName[]={"ITS","TPC","TOF"} ;
32e49607 43const char * kParticleSpeciesName[]={"Pions","Kaons","Protons","Undefined"} ;
44
45ClassImp(AliHelperPID)
46
d2062f6b 47AliHelperPID::AliHelperPID() : TNamed("HelperPID", "PID object"),fisMC(0), fPIDType(kNSigmaTPCTOF), fNSigmaPID(3), fBayesCut(0.8), fPIDResponse(0), fPIDCombined(0),fOutputList(0),fRequestTOFPID(1),fRemoveTracksT0Fill(0),fUseExclusiveNSigma(0),fPtTOFPID(.6),fHasTOFPID(0){
32e49607 48
49 for(Int_t ipart=0;ipart<kNSpecies;ipart++)
50 for(Int_t ipid=0;ipid<=kNSigmaPIDType;ipid++)
51 fnsigmas[ipart][ipid]=999.;
52
53 for(Int_t ipart=0;ipart<kNSpecies;ipart++)fHasDoubleCounting[ipart]=kFALSE;
54
55 fOutputList = new TList;
56 fOutputList->SetOwner();
57 fOutputList->SetName("OutputList");
58
59 //nsigma plot
60 for(Int_t ipart=0;ipart<kNSpecies;ipart++){
61 for(Int_t ipid=0;ipid<=kNSigmaPIDType;ipid++){
62 Double_t miny=-30;
63 Double_t maxy=30;
64 if(ipid==kNSigmaTPCTOF){miny=0;maxy=50;}
d2062f6b 65 TH2F *fHistoNSigma=new TH2F(Form("NSigma_%d_%d",ipart,ipid),Form("n#sigma %s %s",kParticleSpeciesName[ipart],kPIDTypeName[ipid]),200,0,10,500,miny,maxy);
32e49607 66 fHistoNSigma->GetXaxis()->SetTitle("P_{T} (GeV / c)");
67 fHistoNSigma->GetYaxis()->SetTitle(Form("n#sigma %s %s",kParticleSpeciesName[ipart],kPIDTypeName[ipid]));
68 fOutputList->Add(fHistoNSigma);
69 }
70 }
71
72 //nsigmaRec plot
73 for(Int_t ipart=0;ipart<kNSpecies;ipart++){
74 for(Int_t ipid=0;ipid<=kNSigmaPIDType;ipid++){
75 Double_t miny=-10;
76 Double_t maxy=10;
77 if(ipid==kNSigmaTPCTOF){miny=0;maxy=20;}
78 TH2F *fHistoNSigma=new TH2F(Form("NSigmaRec_%d_%d",ipart,ipid),
d2062f6b 79 Form("n#sigma for reconstructed %s %s",kParticleSpeciesName[ipart],kPIDTypeName[ipid]),200,0,10,500,miny,maxy);
32e49607 80 fHistoNSigma->GetXaxis()->SetTitle("P_{T} (GeV / c)");
81 fHistoNSigma->GetYaxis()->SetTitle(Form("n#sigma %s %s",kParticleSpeciesName[ipart],kPIDTypeName[ipid]));
82 fOutputList->Add(fHistoNSigma);
83 }
84 }
85
d2062f6b 86 //BayesRec plot
87 for(Int_t ipart=0;ipart<kNSpecies;ipart++){
88 Double_t miny=0.;
89 Double_t maxy=1;
90 TH2F *fHistoBayes=new TH2F(Form("BayesRec_%d",ipart),
91 Form("probability for reconstructed %s",kParticleSpeciesName[ipart]),200,0,10,500,miny,maxy);
92 fHistoBayes->GetXaxis()->SetTitle("P_{T} (GeV / c)");
93 fHistoBayes->GetYaxis()->SetTitle(Form("Bayes prob %s",kParticleSpeciesName[ipart]));
94 fOutputList->Add(fHistoBayes);
95 }
96
32e49607 97 //nsigmaDC plot
98 for(Int_t ipart=0;ipart<kNSpecies;ipart++){
99 for(Int_t ipid=0;ipid<=kNSigmaPIDType;ipid++){
100 Double_t miny=-10;
101 Double_t maxy=10;
102 if(ipid==kNSigmaTPCTOF){miny=0;maxy=20;}
103 TH2F *fHistoNSigma=new TH2F(Form("NSigmaDC_%d_%d",ipart,ipid),
d2062f6b 104 Form("n#sigma for double counting %s %s",kParticleSpeciesName[ipart],kPIDTypeName[ipid]),200,0,10,500,miny,maxy);
32e49607 105 fHistoNSigma->GetXaxis()->SetTitle("P_{T} (GeV / c)");
106 fHistoNSigma->GetYaxis()->SetTitle(Form("n#sigma %s %s",kParticleSpeciesName[ipart],kPIDTypeName[ipid]));
107 fOutputList->Add(fHistoNSigma);
108 }
109 }
110
111 //nsigmaMC plot
112 for(Int_t ipart=0;ipart<kNSpecies;ipart++){
113 for(Int_t ipid=0;ipid<=kNSigmaPIDType;ipid++){
114 Double_t miny=-30;
115 Double_t maxy=30;
116 if(ipid==kNSigmaTPCTOF){miny=0;maxy=50;}
117 TH2F *fHistoNSigma=new TH2F(Form("NSigmaMC_%d_%d",ipart,ipid),
d2062f6b 118 Form("n#sigma for MC %s %s",kParticleSpeciesName[ipart],kPIDTypeName[ipid]),200,0,10,500,miny,maxy);
32e49607 119 fHistoNSigma->GetXaxis()->SetTitle("P_{T} (GeV / c)");
120 fHistoNSigma->GetYaxis()->SetTitle(Form("n#sigma %s %s",kParticleSpeciesName[ipart],kPIDTypeName[ipid]));
121 fOutputList->Add(fHistoNSigma);
122 }
123 }
124
125 //PID signal plot
126 for(Int_t idet=0;idet<kNDetectors;idet++){
d2062f6b 127 for(Int_t ipart=0;ipart<kNSpecies;ipart++){
128 Double_t maxy=500;
129 if(idet==kTOF)maxy=1.1;
130 TH2F *fHistoPID=new TH2F(Form("PID_%d_%d",idet,ipart),Form("%s signal - %s",kDetectorName[idet],kParticleSpeciesName[ipart]),200,0,10,500,-maxy,maxy);
131 fHistoPID->GetXaxis()->SetTitle("P (GeV / c)");
132 fHistoPID->GetYaxis()->SetTitle(Form("%s signal",kDetectorName[idet]));
133 fOutputList->Add(fHistoPID);
134 }
32e49607 135 }
136}
137
138//////////////////////////////////////////////////////////////////////////////////////////////////
139
140TH2F* AliHelperPID::GetHistogram2D(const char * name){
141 // returns histo named name
142 return (TH2F*) fOutputList->FindObject(name);
143}
144
145//////////////////////////////////////////////////////////////////////////////////////////////////
146
147Int_t AliHelperPID::GetParticleSpecies(AliVTrack * trk, Bool_t FIllQAHistos){
148 //return the specie according to the minimum nsigma value
149 //no double counting, this has to be evaluated using CheckDoubleCounting()
32e49607 150
d2062f6b 151 Int_t ID=kSpUndefined;
152
153 //get the PID response
154 if(!fPIDResponse) {
155 AliAnalysisManager *man = AliAnalysisManager::GetAnalysisManager();
156 AliInputEventHandler* inputHandler = (AliInputEventHandler*)(man->GetInputEventHandler());
157 fPIDResponse = inputHandler->GetPIDResponse();
158 }
159 if(!fPIDResponse) {
160 AliFatal("Cannot get pid response");
161 }
162
163 //calculate nsigmas (used also by the bayesian)
32e49607 164 CalculateNSigmas(trk,FIllQAHistos);//fill the data member fnsigmas with the nsigmas value [ipart][iPID]
165
d2062f6b 166 //Do PID
167 if(fPIDType==kBayes){//use bayesianPID
168
169 if(!fPIDCombined) {
170 AliFatal("PIDCombined object has to be set in the steering macro");
171 }
172
173 ID = GetIDBayes(trk,FIllQAHistos);
174
175 }else{ //use nsigma PID
176
177 ID=FindMinNSigma(trk,FIllQAHistos);
178
179 if(fUseExclusiveNSigma){ //if one particle has double counting and exclusive nsigma is requested ID = kSpUndefined
180 Bool_t *HasDC;
181 HasDC=GetDoubleCounting(trk,FIllQAHistos);
182 for(Int_t ipart=0;ipart<kNSpecies;ipart++){
183 if(HasDC[ipart]==kTRUE) ID = kSpUndefined;
184 }
5838bc91 185 }
186 }
32e49607 187
d2062f6b 188 //Fill PID signal plot
189 if(ID != kSpUndefined){
190 for(Int_t idet=0;idet<kNDetectors;idet++){
191 TH2F *h=GetHistogram2D(Form("PID_%d_%d",idet,ID));
192 if(idet==kITS)h->Fill(trk->P(),trk->GetITSsignal()*trk->Charge());
193 if(idet==kTPC)h->Fill(trk->P(),trk->GetTPCsignal()*trk->Charge());
194 if(idet==kTOF && fHasTOFPID)h->Fill(trk->P(),TOFBetaCalc(trk)*trk->Charge());
195 }
196 }
197 return ID;
32e49607 198}
199
200//////////////////////////////////////////////////////////////////////////////////////////////////
201
7d3a3d9b 202Int_t AliHelperPID::GetParticleSpecies(AliVParticle * part) {
203 // return PID according to MC truth
204 switch(TMath::Abs(part->PdgCode())){
205 case 2212:
206 return kSpProton;
207 break;
208 case 321:
209 return kSpKaon;
210 break;
211 case 211:
212 return kSpPion;
213 break;
214 default:
215 return kSpUndefined;
216 }
217}
218
219//////////////////////////////////////////////////////////////////////////////////////////////////
220
d2062f6b 221Int_t AliHelperPID::GetIDBayes(AliVTrack * trk, Bool_t FIllQAHistos){
222
223 Bool_t *IDs=GetAllCompatibleIdentitiesNSigma(trk,FIllQAHistos);
224
225 Double_t probBayes[AliPID::kSPECIES];
226
227 UInt_t detUsed= 0;
228 CheckTOF(trk);
229 if(fHasTOFPID && trk->Pt()>fPtTOFPID){//use TOF information
230 detUsed = CalcPIDCombined(trk, fPIDResponse, AliPIDResponse::kDetTOF|AliPIDResponse::kDetTPC, probBayes);
231 if(detUsed != (AliPIDResponse::kDetTOF|AliPIDResponse::kDetTPC))return kSpUndefined;//check that TPC and TOF are used
232 }else{
233 detUsed = CalcPIDCombined(trk, fPIDResponse,AliPIDResponse::kDetTPC, probBayes);
234 if(detUsed != AliPIDResponse::kDetTPC)return kSpUndefined;//check that TPC is used
32e49607 235 }
d2062f6b 236
237 //the probability has to be normalized to one, we check it
238 Double_t sump=0.;
239 for(Int_t ipart=0;ipart<AliPID::kSPECIES;ipart++)sump+=probBayes[ipart];
240 if(sump<.99 && sump>1.01){//FIXME precision problem in the sum, workaround
241 AliFatal("Bayesian probability not normalized to one");
242 }
243
244 //probabilities are normalized to one, if the cut is above .5 there is no problem
245 if(probBayes[AliPID::kPion]>fBayesCut && IDs[kSpPion]==1){
246 TH2F *h=GetHistogram2D(Form("BayesRec_%d",kSpPion));
247 h->Fill(trk->Pt(),probBayes[AliPID::kPion]);
248 return kSpPion;
32e49607 249 }
d2062f6b 250 else if(probBayes[AliPID::kKaon]>fBayesCut && IDs[kSpKaon]==1){
251 TH2F *h=GetHistogram2D(Form("BayesRec_%d",kSpKaon));
252 h->Fill(trk->Pt(),probBayes[AliPID::kKaon]);
253 return kSpKaon;
254 }
255 else if(probBayes[AliPID::kProton]>fBayesCut && IDs[kSpProton]==1){
256 TH2F *h=GetHistogram2D(Form("BayesRec_%d",kSpProton));
257 h->Fill(trk->Pt(),probBayes[AliPID::kProton]);
258 return kSpProton;
259 }
260 else{
261 return kSpUndefined;
262 }
263}
264
265//////////////////////////////////////////////////////////////////////////////////////////////////
266
267UInt_t AliHelperPID::CalcPIDCombined(const AliVTrack *track,const AliPIDResponse *PIDResponse, Int_t detMask, Double_t* prob) const{
268 //
269 // Bayesian PID calculation
270 //
271 for(Int_t i=0;i<AliPID::kSPECIES;i++)
272 {
273 prob[i]=0.;
274 }
275 fPIDCombined->SetDetectorMask(detMask);
276
277 return fPIDCombined->ComputeProbabilities((AliVTrack*)track, PIDResponse, prob);
278}
279
280//////////////////////////////////////////////////////////////////////////////////////////////////
281
282void AliHelperPID::CalculateNSigmas(AliVTrack * trk, Bool_t FIllQAHistos){
283 //defines data member fnsigmas
32e49607 284
285 // Compute nsigma for each hypthesis
286 AliVParticle *inEvHMain = dynamic_cast<AliVParticle *>(trk);
287 // --- TPC
288 Double_t nsigmaTPCkProton = fPIDResponse->NumberOfSigmasTPC(inEvHMain, AliPID::kProton);
289 Double_t nsigmaTPCkKaon = fPIDResponse->NumberOfSigmasTPC(inEvHMain, AliPID::kKaon);
290 Double_t nsigmaTPCkPion = fPIDResponse->NumberOfSigmasTPC(inEvHMain, AliPID::kPion);
291 // --- TOF
292 Double_t nsigmaTOFkProton=999.,nsigmaTOFkKaon=999.,nsigmaTOFkPion=999.;
293 Double_t nsigmaTPCTOFkProton=999.,nsigmaTPCTOFkKaon=999.,nsigmaTPCTOFkPion=999.;
294
295 CheckTOF(trk);
296
297 if(fHasTOFPID && trk->Pt()>fPtTOFPID){//use TOF information
298 nsigmaTOFkProton = fPIDResponse->NumberOfSigmasTOF(inEvHMain, AliPID::kProton);
299 nsigmaTOFkKaon = fPIDResponse->NumberOfSigmasTOF(inEvHMain, AliPID::kKaon);
300 nsigmaTOFkPion = fPIDResponse->NumberOfSigmasTOF(inEvHMain, AliPID::kPion);
aed2199f 301 Double_t d2Proton=nsigmaTPCkProton * nsigmaTPCkProton + nsigmaTOFkProton * nsigmaTOFkProton;
302 Double_t d2Kaon=nsigmaTPCkKaon * nsigmaTPCkKaon + nsigmaTOFkKaon * nsigmaTOFkKaon;
303 Double_t d2Pion=nsigmaTPCkPion * nsigmaTPCkPion + nsigmaTOFkPion * nsigmaTOFkPion;
304 //commented, this is done in analogy with AliESDTrackCuts, nsigma combind according to the probability
32e49607 305 // --- combined
aed2199f 306 // -----------------------------------
307 // How to get to a n-sigma cut?
308 //
309 // The accumulated statistics from 0 to d is
310 //
311 // -> Erf(d/Sqrt(2)) for a 1-dim gauss (d = n_sigma)
312 // -> 1 - Exp(-d**2) for a 2-dim gauss (d*d = dx*dx + dy*dy != n_sigma)
313 // It means that for a 2-dim gauss: n_sigma(d) = Sqrt(2)*ErfInv(1 - Exp((-d**2)/2)
314 //
315 // work around precision problem
316 // if d is too big, TMath::Exp(...) gets 0, and TMath::ErfInverse(1) that should be infinite, gets 0 :(
317 //if(TMath::Exp(- d2Proton / 2) > 1e-15)nsigmaTPCTOFkProton = TMath::Sqrt(2)*TMath::ErfInverse(1 - TMath::Exp(- d2Proton / 2));
318 //if(TMath::Exp(- d2Kaon / 2) > 1e-15)nsigmaTPCTOFkKaon = TMath::Sqrt(2)*TMath::ErfInverse(1 - TMath::Exp(- d2Kaon / 2));
319 //if(TMath::Exp(- d2Pion / 2) > 1e-15)nsigmaTPCTOFkPion = TMath::Sqrt(2)*TMath::ErfInverse(1 - TMath::Exp(- d2Pion / 2));
320
321 //used for the 2PC PID paper (circular cut)
322 nsigmaTPCTOFkProton = TMath::Sqrt(d2Proton);
323 nsigmaTPCTOFkKaon = TMath::Sqrt(d2Kaon);
324 nsigmaTPCTOFkPion = TMath::Sqrt(d2Pion);
32e49607 325 }else{
326 // --- combined
327 // if TOF is missing and below fPtTOFPID only the TPC information is used
328 nsigmaTPCTOFkProton = TMath::Abs(nsigmaTPCkProton);
329 nsigmaTPCTOFkKaon = TMath::Abs(nsigmaTPCkKaon);
330 nsigmaTPCTOFkPion = TMath::Abs(nsigmaTPCkPion);
331 }
332
333 //set data member fnsigmas
334 fnsigmas[kSpPion][kNSigmaTPC]=nsigmaTPCkPion;
335 fnsigmas[kSpKaon][kNSigmaTPC]=nsigmaTPCkKaon;
336 fnsigmas[kSpProton][kNSigmaTPC]=nsigmaTPCkProton;
337 fnsigmas[kSpPion][kNSigmaTOF]=nsigmaTOFkPion;
338 fnsigmas[kSpKaon][kNSigmaTOF]=nsigmaTOFkKaon;
339 fnsigmas[kSpProton][kNSigmaTOF]=nsigmaTOFkProton;
340 fnsigmas[kSpPion][kNSigmaTPCTOF]=nsigmaTPCTOFkPion;
341 fnsigmas[kSpKaon][kNSigmaTPCTOF]=nsigmaTPCTOFkKaon;
342 fnsigmas[kSpProton][kNSigmaTPCTOF]=nsigmaTPCTOFkProton;
343
344 if(FIllQAHistos){
345 //Fill NSigma SeparationPlot
346 for(Int_t ipart=0;ipart<kNSpecies;ipart++){
347 for(Int_t ipid=0;ipid<=kNSigmaPIDType;ipid++){
348 if((ipid!=kNSigmaTPC) && (!fHasTOFPID) && trk->Pt()<fPtTOFPID)continue;//not filling TOF and combined if no TOF PID
349 TH2F *h=GetHistogram2D(Form("NSigma_%d_%d",ipart,ipid));
350 h->Fill(trk->Pt(),fnsigmas[ipart][ipid]);
351 }
352 }
32e49607 353 }
354}
355
356//////////////////////////////////////////////////////////////////////////////////////////////////
357
358Int_t AliHelperPID::FindMinNSigma(AliVTrack * trk,Bool_t FillQAHistos){
359
360 CheckTOF(trk);
361 if(fRequestTOFPID && (!fHasTOFPID) && trk->Pt()>fPtTOFPID)return kSpUndefined;
362
363 //get the identity of the particle with the minimum Nsigma
364 Double_t nsigmaPion=999., nsigmaKaon=999., nsigmaProton=999.;
365 switch (fPIDType){
366 case kNSigmaTPC:
367 nsigmaProton = TMath::Abs(fnsigmas[kSpProton][kNSigmaTPC]);
368 nsigmaKaon = TMath::Abs(fnsigmas[kSpKaon][kNSigmaTPC]) ;
369 nsigmaPion = TMath::Abs(fnsigmas[kSpPion][kNSigmaTPC]) ;
370 break;
371 case kNSigmaTOF:
372 nsigmaProton = TMath::Abs(fnsigmas[kSpProton][kNSigmaTOF]);
373 nsigmaKaon = TMath::Abs(fnsigmas[kSpKaon][kNSigmaTOF]) ;
374 nsigmaPion = TMath::Abs(fnsigmas[kSpPion][kNSigmaTOF]) ;
375 break;
376 case kNSigmaTPCTOF://In case of no TOF matching the combined nsigma is the TPC one
377 nsigmaProton = TMath::Abs(fnsigmas[kSpProton][kNSigmaTPCTOF]);
378 nsigmaKaon = TMath::Abs(fnsigmas[kSpKaon][kNSigmaTPCTOF]) ;
379 nsigmaPion = TMath::Abs(fnsigmas[kSpPion][kNSigmaTPCTOF]) ;
380 break;
d2062f6b 381 case kBayes://the nsigma in the bayesian is used to clean with a very large n-sigma value
382 nsigmaProton = TMath::Abs(fnsigmas[kSpProton][kNSigmaTPCTOF]);
383 nsigmaKaon = TMath::Abs(fnsigmas[kSpKaon][kNSigmaTPCTOF]) ;
384 nsigmaPion = TMath::Abs(fnsigmas[kSpPion][kNSigmaTPCTOF]) ;
385 break;
32e49607 386 }
387
388 // guess the particle based on the smaller nsigma (within fNSigmaPID)
389 if( ( nsigmaKaon==nsigmaPion ) && ( nsigmaKaon==nsigmaProton )) return kSpUndefined;//if is the default value for the three
390
391 if( ( nsigmaKaon < nsigmaPion ) && ( nsigmaKaon < nsigmaProton ) && (nsigmaKaon < fNSigmaPID)){
392 if(FillQAHistos){
393 for(Int_t ipid=0;ipid<=kNSigmaPIDType;ipid++){
394 if((ipid!=kNSigmaTPC) && (!fHasTOFPID) && (trk->Pt()<fPtTOFPID))continue;//not filling TOF and combined if no TOF PID
395 TH2F *h=GetHistogram2D(Form("NSigmaRec_%d_%d",kSpKaon,ipid));
396 h->Fill(trk->Pt(),fnsigmas[kSpKaon][ipid]);
397 }
398 }
399 return kSpKaon;
400 }
401 if( ( nsigmaPion < nsigmaKaon ) && ( nsigmaPion < nsigmaProton ) && (nsigmaPion < fNSigmaPID)){
402 if(FillQAHistos){
403 for(Int_t ipid=0;ipid<=kNSigmaPIDType;ipid++){
404 if((ipid!=kNSigmaTPC) && (!fHasTOFPID) && (trk->Pt()<fPtTOFPID))continue;//not filling TOF and combined if no TOF PID
405 TH2F *h=GetHistogram2D(Form("NSigmaRec_%d_%d",kSpPion,ipid));
406 h->Fill(trk->Pt(),fnsigmas[kSpPion][ipid]);
407 }
408 }
409 return kSpPion;
410 }
411 if( ( nsigmaProton < nsigmaKaon ) && ( nsigmaProton < nsigmaPion ) && (nsigmaProton < fNSigmaPID)){
412 if(FillQAHistos){
413 for(Int_t ipid=0;ipid<=kNSigmaPIDType;ipid++){
414 if((ipid!=kNSigmaTPC) && (!fHasTOFPID) && (trk->Pt()<fPtTOFPID))continue;//not filling TOF and combined if no TOF PID
415 TH2F *h=GetHistogram2D(Form("NSigmaRec_%d_%d",kSpProton,ipid));
416 h->Fill(trk->Pt(),fnsigmas[kSpProton][ipid]);
417 }
418 }
419 return kSpProton;
420 }
421 // else, return undefined
422 return kSpUndefined;
423}
424
425//////////////////////////////////////////////////////////////////////////////////////////////////
426
427Bool_t* AliHelperPID::GetDoubleCounting(AliVTrack * trk,Bool_t FIllQAHistos){
428 //if a particle has double counting set fHasDoubleCounting[ipart]=kTRUE
429 //fill DC histos
8ccf185c 430 for(Int_t ipart=0;ipart<kNSpecies;ipart++)fHasDoubleCounting[ipart]=kFALSE;//array with kTRUE for second (or third) identity of the track
32e49607 431
432 Int_t MinNSigma=FindMinNSigma(trk,kFALSE);//not filling the NSigmaRec histos
433
434 CheckTOF(trk);
435
436 if(MinNSigma==kSpUndefined)return fHasDoubleCounting;//in case of undefined no Double counting
437
438 Double_t nsigmaPion=999., nsigmaKaon=999., nsigmaProton=999.;
439 switch (fPIDType) {
440 case kNSigmaTPC:
441 nsigmaProton = TMath::Abs(fnsigmas[kSpProton][kNSigmaTPC]);
442 nsigmaKaon = TMath::Abs(fnsigmas[kSpKaon][kNSigmaTPC]) ;
443 nsigmaPion = TMath::Abs(fnsigmas[kSpPion][kNSigmaTPC]) ;
444 break;
445 case kNSigmaTOF:
446 nsigmaProton = TMath::Abs(fnsigmas[kSpProton][kNSigmaTOF]);
447 nsigmaKaon = TMath::Abs(fnsigmas[kSpKaon][kNSigmaTOF]) ;
448 nsigmaPion = TMath::Abs(fnsigmas[kSpPion][kNSigmaTOF]) ;
449 break;
450 case kNSigmaTPCTOF://In case of no TOF matching the combined nsigma is the TPC one
451 nsigmaProton = TMath::Abs(fnsigmas[kSpProton][kNSigmaTPCTOF]);
452 nsigmaKaon = TMath::Abs(fnsigmas[kSpKaon][kNSigmaTPCTOF]) ;
453 nsigmaPion = TMath::Abs(fnsigmas[kSpPion][kNSigmaTPCTOF]) ;
454 break;
d2062f6b 455 case kBayes://the nsigma in the bayesian is used to clean with a very large n-sigma value
456 nsigmaProton = TMath::Abs(fnsigmas[kSpProton][kNSigmaTPCTOF]);
457 nsigmaKaon = TMath::Abs(fnsigmas[kSpKaon][kNSigmaTPCTOF]) ;
458 nsigmaPion = TMath::Abs(fnsigmas[kSpPion][kNSigmaTPCTOF]) ;
459 break;
32e49607 460 }
461 if(nsigmaPion<fNSigmaPID && MinNSigma!=kSpPion)fHasDoubleCounting[kSpPion]=kTRUE;
462 if(nsigmaKaon<fNSigmaPID && MinNSigma!=kSpKaon)fHasDoubleCounting[kSpKaon]=kTRUE;
463 if(nsigmaProton<fNSigmaPID && MinNSigma!=kSpProton)fHasDoubleCounting[kSpProton]=kTRUE;
464
465 if(FIllQAHistos){
466 //fill NSigma distr for double counting
467 for(Int_t ipart=0;ipart<kNSpecies;ipart++){
468 if(fHasDoubleCounting[ipart]){
469 for(Int_t ipid=0;ipid<=kNSigmaPIDType;ipid++){
470 if((ipid!=kNSigmaTPC) && (!fHasTOFPID) && (trk->Pt()<fPtTOFPID))continue;//not filling TOF and combined if no TOF PID
471 TH2F *h=GetHistogram2D(Form("NSigmaDC_%d_%d",ipart,ipid));
472 h->Fill(trk->Pt(),fnsigmas[ipart][ipid]);
473 }
474 }
475 }
476 }
477 return fHasDoubleCounting;
478}
479
480//////////////////////////////////////////////////////////////////////////////////////////////////
481
d2062f6b 482Bool_t* AliHelperPID::GetAllCompatibleIdentitiesNSigma(AliVTrack * trk,Bool_t FIllQAHistos){
483
484 Bool_t *IDs=GetDoubleCounting(trk,FIllQAHistos);
485 IDs[FindMinNSigma(trk,FIllQAHistos)]=kTRUE;
486 return IDs;
487
488}
489
490//////////////////////////////////////////////////////////////////////////////////////////////////
491
32e49607 492Int_t AliHelperPID::GetMCParticleSpecie(AliVEvent* event, AliVTrack * trk, Bool_t FillQAHistos){
493 //return the specie according to the MC truth
494 CheckTOF(trk);
495
496 if(!fisMC)AliFatal("Error: AliHelperPID::GetMCParticleSpecie called on data\n");
497
498 Int_t code=999;
499 Bool_t isAOD=kFALSE;
500 Bool_t isESD=kFALSE;
501 TString nameoftrack(event->ClassName());
502 if(!nameoftrack.CompareTo("AliESDEvent"))isESD=kTRUE;
503 else if(!nameoftrack.CompareTo("AliAODEvent"))isAOD=kTRUE;
504 else AliFatal("Not processing AODs nor ESDs") ;
505
506 if(isAOD){
507 TClonesArray *arrayMC = 0;
508 arrayMC = (TClonesArray*) event->GetList()->FindObject(AliAODMCParticle::StdBranchName());
509 if (!arrayMC)AliFatal("Error: MC particles branch not found!\n");
510 AliAODMCParticle *partMC = (AliAODMCParticle*) arrayMC->At(TMath::Abs(trk->GetLabel()));
511 if (!partMC){
512 AliError("Cannot get MC particle");
513 return kSpUndefined;
514 }
515 code=partMC->GetPdgCode();
516 }
517 if(isESD){
518 AliStack* stack=0x0;
519 AliMCEventHandler* eventHandler = dynamic_cast<AliMCEventHandler*> (AliAnalysisManager::GetAnalysisManager()->GetMCtruthEventHandler());
520 if (!eventHandler) AliFatal("ERROR: Could not retrieve MC event handler");
521 AliMCEvent* mcEvent = eventHandler->MCEvent();
522 if (!mcEvent)AliFatal("ERROR: Could not retrieve MC event");
523 stack = mcEvent->Stack();
524 if (!stack) AliFatal("ERROR: stack not available\n");
525 TParticle *part=0;
526 part = (TParticle*)stack->Particle(TMath::Abs(trk->GetLabel()));
527 if (!part){
528 AliError("Cannot get MC particle");
529 return kSpUndefined;
530 }
531 code = part->GetPdgCode();
532 }
533 switch(TMath::Abs(code)){
534 case 2212:
535 if(FillQAHistos){
536 for(Int_t ipid=0;ipid<=kNSigmaPIDType;ipid++){
537 if((ipid!=kNSigmaTPC) && (!fHasTOFPID) && (trk->Pt()<fPtTOFPID))continue;//not filling TOF and combined if no TOF PID
538 TH2F *h=GetHistogram2D(Form("NSigmaMC_%d_%d",kSpProton,ipid));
539 h->Fill(trk->Pt(),fnsigmas[kSpProton][ipid]);
540 }
541 }
542 return kSpProton;
543 break;
544 case 321:
545 if(FillQAHistos){
546 for(Int_t ipid=0;ipid<=kNSigmaPIDType;ipid++){
547 if((ipid!=kNSigmaTPC) && (!fHasTOFPID) && (trk->Pt()<fPtTOFPID))continue;//not filling TOF and combined if no TOF PID
548 TH2F *h=GetHistogram2D(Form("NSigmaMC_%d_%d",kSpKaon,ipid));
549 h->Fill(trk->Pt(),fnsigmas[kSpKaon][ipid]);
550 }
551 }
552 return kSpKaon;
553 break;
554 case 211:
555 if(FillQAHistos){
556 for(Int_t ipid=0;ipid<=kNSigmaPIDType;ipid++){
557 if((ipid!=kNSigmaTPC) && (!fHasTOFPID) && (trk->Pt()<fPtTOFPID))continue;//not filling TOF and combined if no TOF PID
558 TH2F *h=GetHistogram2D(Form("NSigmaMC_%d_%d",kSpPion,ipid));
559 h->Fill(trk->Pt(),fnsigmas[kSpPion][ipid]);
560 }
561 }
562 return kSpPion;
563 break;
564 default:
565 return kSpUndefined;
566 }
567
568}
569
570//////////////////////////////////////////////////////////////////////////////////////////////////
571
572void AliHelperPID::CheckTOF(AliVTrack * trk)
573{
574 //check if the particle has TOF Matching
d2062f6b 575
576 //get the PIDResponse
577 if(fPIDResponse->CheckPIDStatus(AliPIDResponse::kTOF,trk)==0)fHasTOFPID=kFALSE;
32e49607 578 else fHasTOFPID=kTRUE;
d2062f6b 579
580 //in addition to TOF status we look at the pt
32e49607 581 if(trk->Pt()<fPtTOFPID)fHasTOFPID=kFALSE;
b46d749a 582
583 if(fRemoveTracksT0Fill)
584 {
b46d749a 585 Int_t startTimeMask = fPIDResponse->GetTOFResponse().GetStartTimeMask(trk->P());
586 if (startTimeMask < 0)fHasTOFPID=kFALSE;
587 }
32e49607 588}
589
590//////////////////////////////////////////////////////////////////////////////////////////////////
591
d2062f6b 592Double_t AliHelperPID::TOFBetaCalc(AliVTrack *track) const{
593 //TOF beta calculation
594 Double_t tofTime=track->GetTOFsignal();
595
596 Double_t c=TMath::C()*1.E-9;// m/ns
597 Float_t startTime = fPIDResponse->GetTOFResponse().GetStartTime(((AliVTrack*)track)->P());//in ps
598 Double_t length= fPIDResponse->GetTOFResponse().GetExpectedSignal(track,AliPID::kElectron)*1E-3*c;
599 tofTime -= startTime; // subtract startTime to the signal
600 Double_t tof= tofTime*1E-3; // ns, average T0 fill subtracted, no info from T0detector
601 tof=tof*c;
602 return length/tof;
603}
604
605//////////////////////////////////////////////////////////////////////////////////////////////////
606
7d3a3d9b 607Double_t AliHelperPID::GetMass(AliHelperParticleSpecies_t id) const{
608 //return Mass according to AliHelperParticleSpecies_t. If undefined return -999.
609 Double_t mass=-999.;
610 if (id == kSpProton) { mass=9.38271999999999995e-01; }
611 if (id == kSpKaon) { mass=4.93676999999999977e-01; }
612 if (id == kSpPion) { mass=1.39570000000000000e-01; }
613 return mass;
614}
615
616//////////////////////////////////////////////////////////////////////////////////////////////////
617
32e49607 618Long64_t AliHelperPID::Merge(TCollection* list)
619{
620 // Merging interface.
621 // Returns the number of merged objects (including this).
622 Printf("Merging");
623 if (!list)
624 return 0;
625 if (list->IsEmpty())
626 return 1;
627 TIterator* iter = list->MakeIterator();
628 TObject* obj;
629 // collections of TList with output histos
630 TList collections;
631 Int_t count = 0;
632 while ((obj = iter->Next())) {
633 AliHelperPID* entry = dynamic_cast<AliHelperPID*> (obj);
634 if (entry == 0)
635 continue;
636 TList * outputlist = entry->GetOutputList();
637 collections.Add(outputlist);
638 count++;
639 }
640 fOutputList->Merge(&collections);
641 delete iter;
642 Printf("OK");
643 return count+1;
644}