1 /*************************************************************************
2 * Copyright(c) 1998-2009, 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 **************************************************************************/
16 ///////////////////////////////////////////////////////////////////////////
26 ///////////////////////////////////////////////////////////////////////////
32 #include <AliVTrack.h>
33 #include <AliVCluster.h>
35 #include <AliExternalTrackParam.h>
36 #include <AliPIDResponse.h>
37 #include <AliESDtrack.h> //!!!!! Remove once Eta correction is treated in the tender
39 #include "AliDielectronVarManager.h"
41 #include "AliDielectronPID.h"
43 ClassImp(AliDielectronPID)
45 TGraph *AliDielectronPID::fgFitCorr=0x0;
46 Double_t AliDielectronPID::fgCorr=0.0;
47 TF1 *AliDielectronPID::fgFunEtaCorr=0x0;
49 AliDielectronPID::AliDielectronPID() :
55 // Default Constructor
57 for (Int_t icut=0; icut<kNmaxPID; ++icut){
59 fPartType[icut]=AliPID::kPion;
64 fExclude[icut]=kFALSE;
65 fFunUpperCut[icut]=0x0;
66 fFunLowerCut[icut]=0x0;
67 fRequirePIDbit[icut]=0;
72 //______________________________________________
73 AliDielectronPID::AliDielectronPID(const char* name, const char* title) :
74 AliAnalysisCuts(name, title),
81 for (Int_t icut=0; icut<kNmaxPID; ++icut){
83 fPartType[icut]=AliPID::kPion;
88 fExclude[icut]=kFALSE;
89 fFunUpperCut[icut]=0x0;
90 fFunLowerCut[icut]=0x0;
91 fRequirePIDbit[icut]=0;
96 //______________________________________________
97 AliDielectronPID::~AliDielectronPID()
100 // Default Destructor
104 //______________________________________________
105 void AliDielectronPID::AddCut(DetType det, AliPID::EParticleType type, Double_t nSigmaLow, Double_t nSigmaUp/*=-99999.*/,
106 Double_t min/*=0*/, Double_t max/*=0*/, Bool_t exclude/*=kFALSE*/,
107 UInt_t pidBitType/*=AliDielectronPID::kRequire*/, Int_t var/*=-1*/)
110 // Add a pid nsigma cut
111 // use response of detector 'det' in the range ['min'] to ['max'] for var
112 // use a sigma band between 'nSigmaLow' and 'nSigmaUp'
113 // if nSigmaUp==-99999. then nSigmaLow will be uesd as a symmetric band +- nSigmaLow
114 // specify whether to 'exclude' the given band
117 if (fNcuts>=kNmaxPID){
118 AliError(Form("only %d pid cut ranges allowed",kNmaxPID));
121 if (TMath::Abs(nSigmaUp+99999.)<1e-20){
122 nSigmaUp=TMath::Abs(nSigmaLow);
123 nSigmaLow=-1.*nSigmaUp;
125 fDetType[fNcuts]=det;
126 fPartType[fNcuts]=type;
127 fNsigmaLow[fNcuts]=nSigmaLow;
128 fNsigmaUp[fNcuts]=nSigmaUp;
131 fExclude[fNcuts]=exclude;
132 fRequirePIDbit[fNcuts]=pidBitType;
133 fActiveCuts[fNcuts]=(var==-1 ? AliDielectronVarManager::kP : var);
135 AliInfo(Form("Add PID cut %d: sigma [% .1f,% .1f] \t cut [% .1f,% .f] \t var %d->%s \n",
136 fNcuts,nSigmaLow,nSigmaUp,min,max,fActiveCuts[fNcuts],AliDielectronVarManager::GetValueName(fActiveCuts[fNcuts])));
142 //______________________________________________
143 void AliDielectronPID::AddCut(DetType det, AliPID::EParticleType type, Double_t nSigmaLow, TF1 * const funUp,
144 Double_t min/*=0*/, Double_t max/*=0*/, Bool_t exclude/*=kFALSE*/,
145 UInt_t pidBitType/*=AliDielectronPID::kRequire*/, Int_t var/*=-1*/)
148 // cut using a TF1 as upper cut
151 AliError("A valid function is required for the upper cut. Not adding the cut!");
154 fFunUpperCut[fNcuts]=funUp;
155 AddCut(det,type,nSigmaLow,0.,min,max,exclude,pidBitType,var);
158 //______________________________________________
159 void AliDielectronPID::AddCut(DetType det, AliPID::EParticleType type, TF1 * const funLow, Double_t nSigmaUp,
160 Double_t min/*=0*/, Double_t max/*=0*/, Bool_t exclude/*=kFALSE*/,
161 UInt_t pidBitType/*=AliDielectronPID::kRequire*/, Int_t var/*=-1*/)
164 // cut using a TF1 as lower cut
167 AliError("A valid function is required for the lower cut. Not adding the cut!");
170 fFunLowerCut[fNcuts]=funLow;
171 AddCut(det,type,0.,nSigmaUp,min,max,exclude,pidBitType,var);
174 //______________________________________________
175 void AliDielectronPID::AddCut(DetType det, AliPID::EParticleType type, TF1 * const funLow, TF1 * const funUp,
176 Double_t min/*=0*/, Double_t max/*=0*/, Bool_t exclude/*=kFALSE*/,
177 UInt_t pidBitType/*=AliDielectronPID::kRequire*/, Int_t var/*=-1*/)
180 // cut using a TF1 as lower and upper cut
182 if ( (funUp==0x0) || (funLow==0x0) ){
183 AliError("A valid function is required for upper and lower cut. Not adding the cut!");
186 fFunUpperCut[fNcuts]=funUp;
187 fFunLowerCut[fNcuts]=funLow;
188 AddCut(det,type,0.,0.,min,max,exclude,pidBitType,var);
191 //______________________________________________
192 Bool_t AliDielectronPID::IsSelected(TObject* track)
199 AliVTrack *part=static_cast<AliVTrack*>(track);
200 AliESDtrack *esdTrack=0x0;
201 Double_t origdEdx=-1;
203 // apply ETa correction, remove once this is in the tender
204 if( (part->IsA() == AliESDtrack::Class()) && fgFunEtaCorr ){
205 esdTrack=static_cast<AliESDtrack*>(part);
206 origdEdx=esdTrack->GetTPCsignal();
207 esdTrack->SetTPCsignal(origdEdx/GetEtaCorr(esdTrack),esdTrack->GetTPCsignalSigma(),esdTrack->GetTPCsignalN());
212 Double_t values[AliDielectronVarManager::kNMaxValues];
213 AliDielectronVarManager::Fill(track,values);
215 Bool_t selected=kFALSE;
216 fPIDResponse=AliDielectronVarManager::GetPIDResponse();
217 for (UChar_t icut=0; icut<fNcuts; ++icut){
218 Double_t min=fmin[icut];
219 Double_t max=fmax[icut];
220 Double_t val=values[fActiveCuts[icut]];
222 // test var range. In case min==max do not cut
223 if ( (TMath::Abs(min-max)>1e-20) && (val<min || val>=max) ) continue;
225 switch (fDetType[icut]){
227 selected = IsSelectedITS(part,icut);
230 selected = IsSelectedTPC(part,icut);
233 selected = IsSelectedTRD(part,icut);
236 selected = IsSelectedTRDeleEff(part,icut);
239 selected = IsSelectedTOF(part,icut);
242 selected = IsSelectedEMCAL(part,icut);
246 if (esdTrack) esdTrack->SetTPCsignal(origdEdx,esdTrack->GetTPCsignalSigma(),esdTrack->GetTPCsignalN());
252 if (esdTrack) esdTrack->SetTPCsignal(origdEdx,esdTrack->GetTPCsignalSigma(),esdTrack->GetTPCsignalN());
256 //______________________________________________
257 Bool_t AliDielectronPID::IsSelectedITS(AliVTrack * const part, Int_t icut)
260 // ITS part of the PID check
261 // Don't accept the track if there was no pid bit set
264 if (fRequirePIDbit[icut]==AliDielectronPID::kRequire&&!(part->GetStatus()&AliVTrack::kITSpid)) return kFALSE;
265 if (fRequirePIDbit[icut]==AliDielectronPID::kIfAvailable&&!(part->GetStatus()&AliVTrack::kITSpid)) return kTRUE;
267 Double_t mom=part->P();
269 Float_t numberOfSigmas=fPIDResponse->NumberOfSigmasITS(part, fPartType[icut]);
271 // test if we are supposed to use a function for the cut
272 if (fFunUpperCut[icut]) fNsigmaUp[icut] =fFunUpperCut[icut]->Eval(mom);
273 if (fFunLowerCut[icut]) fNsigmaLow[icut]=fFunLowerCut[icut]->Eval(mom);
275 Bool_t selected=((numberOfSigmas>=fNsigmaLow[icut])&&(numberOfSigmas<=fNsigmaUp[icut]))^fExclude[icut];
279 //______________________________________________
280 Bool_t AliDielectronPID::IsSelectedTPC(AliVTrack * const part, Int_t icut)
283 // TPC part of the PID check
284 // Don't accept the track if there was no pid bit set
286 if (fRequirePIDbit[icut]==AliDielectronPID::kRequire&&!(part->GetStatus()&AliVTrack::kTPCpid)) return kFALSE;
287 if (fRequirePIDbit[icut]==AliDielectronPID::kIfAvailable&&!(part->GetStatus()&AliVTrack::kTPCpid)) return kTRUE;
289 Double_t mom=part->GetTPCmomentum();
291 Float_t numberOfSigmas=fPIDResponse->NumberOfSigmasTPC(part, fPartType[icut]);
293 if (fPartType[icut]==AliPID::kElectron){
294 numberOfSigmas-=fgCorr;
297 // test if we are supposed to use a function for the cut
298 if (fFunUpperCut[icut]) fNsigmaUp[icut] =fFunUpperCut[icut]->Eval(mom);
299 if (fFunLowerCut[icut]) fNsigmaLow[icut]=fFunLowerCut[icut]->Eval(mom);
301 Bool_t selected=((numberOfSigmas>=fNsigmaLow[icut])&&(numberOfSigmas<=fNsigmaUp[icut]))^fExclude[icut];
305 //______________________________________________
306 Bool_t AliDielectronPID::IsSelectedTRD(AliVTrack * const part, Int_t icut)
309 // TRD part of the pid check
310 // the TRD checks on the probabilities.
313 if (fRequirePIDbit[icut]==AliDielectronPID::kRequire&&!(part->GetStatus()&AliVTrack::kTRDpid)) return kFALSE;
314 if (fRequirePIDbit[icut]==AliDielectronPID::kIfAvailable&&!(part->GetStatus()&AliVTrack::kTRDpid)) return kTRUE;
315 if (fRequirePIDbit[icut]==AliDielectronPID::kIfAvailable && (part->GetTRDntrackletsPID()<4)) return kTRUE;
317 Double_t p[AliPID::kSPECIES]={0.};
318 fPIDResponse->ComputeTRDProbability(part,AliPID::kSPECIES,p);
319 Float_t particleProb=p[fPartType[icut]];
321 Bool_t selected=((particleProb>=fNsigmaLow[icut])&&(particleProb<=fNsigmaUp[icut]))^fExclude[icut];
325 //______________________________________________
326 Bool_t AliDielectronPID::IsSelectedTRDeleEff(AliVTrack * const part, Int_t icut)
329 // TRD part of the pid check using electron efficiency requirement
330 // in this case the upper limit as well as the particle specie is ignored
331 // and the lower limit regarded as the requested electron efficiency
334 if (fRequirePIDbit[icut]==AliDielectronPID::kRequire&&!(part->GetStatus()&AliVTrack::kTRDpid)) return kFALSE;
335 if (fRequirePIDbit[icut]==AliDielectronPID::kIfAvailable&&!(part->GetStatus()&AliVTrack::kTRDpid)) return kTRUE;
337 Bool_t selected=fPIDResponse->IdentifiedAsElectronTRD(part,fNsigmaLow[icut])^fExclude[icut];
341 //______________________________________________
342 Bool_t AliDielectronPID::IsSelectedTOF(AliVTrack * const part, Int_t icut)
345 // TOF part of the PID check
346 // Don't accept the track if there was no pid bit set
349 if (fRequirePIDbit[icut]==AliDielectronPID::kRequire&&!(part->GetStatus()&AliVTrack::kTOFpid)) return kFALSE;
350 if (fRequirePIDbit[icut]==AliDielectronPID::kIfAvailable&&!(part->GetStatus()&AliVTrack::kTOFpid)) return kTRUE;
352 Float_t numberOfSigmas=fPIDResponse->NumberOfSigmasTOF(part, fPartType[icut]);
354 Bool_t selected=((numberOfSigmas>=fNsigmaLow[icut])&&(numberOfSigmas<=fNsigmaUp[icut]))^fExclude[icut];
358 //______________________________________________
359 Bool_t AliDielectronPID::IsSelectedEMCAL(AliVTrack * const part, Int_t icut)
362 // emcal pid selecttion
365 //TODO: correct way to check for emcal pid?
366 Float_t numberOfSigmas=fPIDResponse->NumberOfSigmasEMCAL(part, fPartType[icut]);
368 Bool_t hasPID=numberOfSigmas>-998.;
370 if (fRequirePIDbit[icut]==AliDielectronPID::kRequire&&!hasPID) return kFALSE;
371 if (fRequirePIDbit[icut]==AliDielectronPID::kIfAvailable&&!hasPID) return kTRUE;
374 Bool_t selected=((numberOfSigmas>=fNsigmaLow[icut])&&(numberOfSigmas<=fNsigmaUp[icut]))^fExclude[icut];
378 //______________________________________________
379 void AliDielectronPID::SetDefaults(Int_t def){
381 // initialise default pid strategies
387 // - exclude mu,K,pi,p
389 AddCut(kTPC,AliPID::kElectron,2);
390 AddCut(kTPC,AliPID::kMuon,-2.,2.,0.,0.,kTRUE);
391 AddCut(kTPC,AliPID::kPion,-2.,2.,0.,0.,kTRUE);
392 AddCut(kTPC,AliPID::kKaon,-2.,2.,0.,0.,kTRUE);
393 AddCut(kTPC,AliPID::kProton,-2.,2.,0.,0.,kTRUE);
396 // - include e 0<p<inf
397 // - exclude mu,K,pi,p 0<p<2
398 AddCut(kTPC,AliPID::kElectron,2.);
399 AddCut(kTPC,AliPID::kMuon,-2.,2.,0.,2.,kTRUE);
400 AddCut(kTPC,AliPID::kPion,-2.,2.,0.,2.,kTRUE);
401 AddCut(kTPC,AliPID::kKaon,-2.,2.,0.,2.,kTRUE);
402 AddCut(kTPC,AliPID::kProton,-2.,2.,0.,2.,kTRUE);
405 // include 2sigma e TPC
408 AddCut(kTPC,AliPID::kElectron,-3.,3.);
409 AddCut(kTPC,AliPID::kPion,-3.,3.,0.,0.,kTRUE);
410 AddCut(kTPC,AliPID::kProton,-3.,3.,0.,0.,kTRUE);
412 } else if (def==3 || def==4) { // def3 and def4 are the same??
413 // include 2sigma e TPC
417 AddCut(kTPC,AliPID::kElectron,2);
418 AddCut(kTOF,AliPID::kKaon,-3.,3.,0.,1.,kTRUE);
419 AddCut(kTOF,AliPID::kProton,-6.,6.,0.,1.,kTRUE);
420 AddCut(kTOF,AliPID::kProton,-3.,3.,1.,2.,kTRUE);
423 AddCut(kTPC,AliPID::kElectron,-0.5,3);
424 AddCut(kTOF,AliPID::kElectron,-3,3,0,1.5);
426 // lower cut TPC: parametrisation by HFE
427 // upper cut TPC: 3 sigma
428 // TOF ele band 3sigma 0<p<1.5GeV
429 TF1 *lowerCut=new TF1("lowerCut", "[0] * TMath::Exp([1]*x)", 0, 100);
430 lowerCut->SetParameters(-2.7,-0.4357);
431 AddCut(kTPC,AliPID::kElectron,lowerCut,3.);
432 AddCut(kTOF,AliPID::kElectron,-3,3,0,1.5);
435 // TOF ele band 3sigma 0<p<1.5GeV
436 AddCut(kTPC,AliPID::kElectron,10.);
437 AddCut(kTOF,AliPID::kElectron,-3,3,0,1.5);
439 // TOF 5 sigma inclusion if TOFpid available
440 // this should reduce K,p,Pi to a large extent
441 AddCut(kTOF,AliPID::kElectron,-5,5,0,200,kFALSE,AliDielectronPID::kIfAvailable);
443 // lower cut TPC: parametrisation by HFE
444 // upper cut TPC: 3 sigma
445 // TOF 5 sigma inclusion if TOFpid available
446 // this should reduce K,p,Pi to a large extent
447 TF1 *lowerCut=new TF1("lowerCut", "[0] * TMath::Exp([1]*x)", 0, 100);
448 lowerCut->SetParameters(-2.65,-0.6757);
449 AddCut(kTPC,AliPID::kElectron,lowerCut,4.);
450 AddCut(kTOF,AliPID::kElectron,-5,5,0,200,kFALSE,AliDielectronPID::kIfAvailable);
452 } else if (def==10) {
453 AddCut(kTOF,AliPID::kElectron,-5,5,0,200,kFALSE,AliDielectronPID::kIfAvailable);
454 AddCut(kTPC,AliPID::kElectron,3.);
455 AddCut(kTPC,AliPID::kPion,-3.,3.,0.,0.,kTRUE);
456 AddCut(kTPC,AliPID::kProton,-3.,3.,0.,0.,kTRUE);
458 } else if (def==11) {
459 // lower cut TPC: parametrisation by HFE
460 // only use from period d on !!
461 // upper cut TPC: 3 sigma
462 // TOF ele band 3sigma 0<p<2.0GeV
463 TF1 *lowerCut=new TF1("lowerCut", "[0] * TMath::Exp([1]*x)+[2]", 0, 100);
464 lowerCut->SetParameters(-3.718,-0.4,0.27);
465 AddCut(kTPC,AliPID::kElectron,lowerCut,3.);
466 AddCut(kTOF,AliPID::kElectron,-3,3,0,2.);
467 } else if (def==12) {
468 // lower cut TPC: parametrisation by HFE
469 // only use from period d on !!
470 // upper cut TPC: 3 sigma
471 // TOF 5 sigma inclusion if TOFpid available
472 // this should reduce K,p,Pi to a large extent
473 TF1 *lowerCut=new TF1("lowerCut", "[0] * TMath::Exp([1]*x)+[2]", 0, 100);
474 lowerCut->SetParameters(-3.718,-0.4,0.27);
475 AddCut(kTPC,AliPID::kElectron,lowerCut,4.);
476 AddCut(kTOF,AliPID::kElectron,-5,5,0,200,kFALSE,AliDielectronPID::kIfAvailable);
481 //______________________________________________
482 void AliDielectronPID::SetCorrVal(Double_t run)
485 // set correction value for run
488 if (!fgFitCorr) return;
489 fgCorr=fgFitCorr->Eval(run);
490 if (run<fgFitCorr->GetX()[0]) fgCorr=fgFitCorr->GetY()[0];
491 if (run>fgFitCorr->GetX()[fgFitCorr->GetN()-1]) fgCorr=fgFitCorr->GetY()[fgFitCorr->GetN()-1];
492 // printf("Corr: %f\n",fgCorr);
495 //______________________________________________
496 Double_t AliDielectronPID::GetEtaCorr(AliVTrack *track)
499 // return eta correction
501 if (!fgFunEtaCorr) return 1;
502 return fgFunEtaCorr->Eval(track->Eta());