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 Double_t AliDielectronPID::fgCorrdEdx=1.0;
48 TF1 *AliDielectronPID::fgFunEtaCorr=0x0;
49 TGraph *AliDielectronPID::fgdEdxRunCorr=0x0;
51 AliDielectronPID::AliDielectronPID() :
57 // Default Constructor
59 for (Int_t icut=0; icut<kNmaxPID; ++icut){
61 fPartType[icut]=AliPID::kPion;
66 fExclude[icut]=kFALSE;
67 fFunUpperCut[icut]=0x0;
68 fFunLowerCut[icut]=0x0;
69 fRequirePIDbit[icut]=0;
74 //______________________________________________
75 AliDielectronPID::AliDielectronPID(const char* name, const char* title) :
76 AliAnalysisCuts(name, title),
83 for (Int_t icut=0; icut<kNmaxPID; ++icut){
85 fPartType[icut]=AliPID::kPion;
90 fExclude[icut]=kFALSE;
91 fFunUpperCut[icut]=0x0;
92 fFunLowerCut[icut]=0x0;
93 fRequirePIDbit[icut]=0;
98 //______________________________________________
99 AliDielectronPID::~AliDielectronPID()
102 // Default Destructor
106 //______________________________________________
107 void AliDielectronPID::AddCut(DetType det, AliPID::EParticleType type, Double_t nSigmaLow, Double_t nSigmaUp/*=-99999.*/,
108 Double_t min/*=0*/, Double_t max/*=0*/, Bool_t exclude/*=kFALSE*/,
109 UInt_t pidBitType/*=AliDielectronPID::kRequire*/, Int_t var/*=-1*/)
112 // Add a pid nsigma cut
113 // use response of detector 'det' in the range ['min'] to ['max'] for var
114 // use a sigma band between 'nSigmaLow' and 'nSigmaUp'
115 // if nSigmaUp==-99999. then nSigmaLow will be uesd as a symmetric band +- nSigmaLow
116 // specify whether to 'exclude' the given band
119 if (fNcuts>=kNmaxPID){
120 AliError(Form("only %d pid cut ranges allowed",kNmaxPID));
123 if (TMath::Abs(nSigmaUp+99999.)<1e-20){
124 nSigmaUp=TMath::Abs(nSigmaLow);
125 nSigmaLow=-1.*nSigmaUp;
127 fDetType[fNcuts]=det;
128 fPartType[fNcuts]=type;
129 fNsigmaLow[fNcuts]=nSigmaLow;
130 fNsigmaUp[fNcuts]=nSigmaUp;
133 fExclude[fNcuts]=exclude;
134 fRequirePIDbit[fNcuts]=pidBitType;
135 fActiveCuts[fNcuts]=(var==-1 ? AliDielectronVarManager::kP : var);
137 AliInfo(Form("Add PID cut %d: sigma [% .1f,% .1f] \t cut [% .1f,% .f] \t var %d->%s \n",
138 fNcuts,nSigmaLow,nSigmaUp,min,max,fActiveCuts[fNcuts],AliDielectronVarManager::GetValueName(fActiveCuts[fNcuts])));
144 //______________________________________________
145 void AliDielectronPID::AddCut(DetType det, AliPID::EParticleType type, Double_t nSigmaLow, TF1 * const funUp,
146 Double_t min/*=0*/, Double_t max/*=0*/, Bool_t exclude/*=kFALSE*/,
147 UInt_t pidBitType/*=AliDielectronPID::kRequire*/, Int_t var/*=-1*/)
150 // cut using a TF1 as upper cut
153 AliError("A valid function is required for the upper cut. Not adding the cut!");
156 fFunUpperCut[fNcuts]=funUp;
157 AddCut(det,type,nSigmaLow,0.,min,max,exclude,pidBitType,var);
160 //______________________________________________
161 void AliDielectronPID::AddCut(DetType det, AliPID::EParticleType type, TF1 * const funLow, Double_t nSigmaUp,
162 Double_t min/*=0*/, Double_t max/*=0*/, Bool_t exclude/*=kFALSE*/,
163 UInt_t pidBitType/*=AliDielectronPID::kRequire*/, Int_t var/*=-1*/)
166 // cut using a TF1 as lower cut
169 AliError("A valid function is required for the lower cut. Not adding the cut!");
172 fFunLowerCut[fNcuts]=funLow;
173 AddCut(det,type,0.,nSigmaUp,min,max,exclude,pidBitType,var);
176 //______________________________________________
177 void AliDielectronPID::AddCut(DetType det, AliPID::EParticleType type, TF1 * const funLow, TF1 * const funUp,
178 Double_t min/*=0*/, Double_t max/*=0*/, Bool_t exclude/*=kFALSE*/,
179 UInt_t pidBitType/*=AliDielectronPID::kRequire*/, Int_t var/*=-1*/)
182 // cut using a TF1 as lower and upper cut
184 if ( (funUp==0x0) || (funLow==0x0) ){
185 AliError("A valid function is required for upper and lower cut. Not adding the cut!");
188 fFunUpperCut[fNcuts]=funUp;
189 fFunLowerCut[fNcuts]=funLow;
190 AddCut(det,type,0.,0.,min,max,exclude,pidBitType,var);
193 //______________________________________________
194 Bool_t AliDielectronPID::IsSelected(TObject* track)
201 AliVTrack *part=static_cast<AliVTrack*>(track);
202 AliESDtrack *esdTrack=0x0;
203 Double_t origdEdx=-1;
205 // apply ETa correction, remove once this is in the tender
206 if( (part->IsA() == AliESDtrack::Class()) && fgFunEtaCorr ){
207 esdTrack=static_cast<AliESDtrack*>(part);
208 origdEdx=esdTrack->GetTPCsignal();
209 esdTrack->SetTPCsignal(origdEdx/GetEtaCorr(esdTrack)/fgCorrdEdx,esdTrack->GetTPCsignalSigma(),esdTrack->GetTPCsignalN());
214 Double_t values[AliDielectronVarManager::kNMaxValues];
215 AliDielectronVarManager::Fill(track,values);
217 Bool_t selected=kFALSE;
218 fPIDResponse=AliDielectronVarManager::GetPIDResponse();
219 for (UChar_t icut=0; icut<fNcuts; ++icut){
220 Double_t min=fmin[icut];
221 Double_t max=fmax[icut];
222 Double_t val=values[fActiveCuts[icut]];
224 // test var range. In case min==max do not cut
225 if ( (TMath::Abs(min-max)>1e-20) && (val<min || val>=max) ) continue;
227 switch (fDetType[icut]){
229 selected = IsSelectedITS(part,icut);
232 selected = IsSelectedTPC(part,icut);
235 selected = IsSelectedTRD(part,icut);
238 selected = IsSelectedTRDeleEff(part,icut);
241 selected = IsSelectedTOF(part,icut);
244 selected = IsSelectedEMCAL(part,icut);
248 if (esdTrack) esdTrack->SetTPCsignal(origdEdx,esdTrack->GetTPCsignalSigma(),esdTrack->GetTPCsignalN());
254 if (esdTrack) esdTrack->SetTPCsignal(origdEdx,esdTrack->GetTPCsignalSigma(),esdTrack->GetTPCsignalN());
258 //______________________________________________
259 Bool_t AliDielectronPID::IsSelectedITS(AliVTrack * const part, Int_t icut)
262 // ITS part of the PID check
263 // Don't accept the track if there was no pid bit set
266 if (fRequirePIDbit[icut]==AliDielectronPID::kRequire&&!(part->GetStatus()&AliVTrack::kITSpid)) return kFALSE;
267 if (fRequirePIDbit[icut]==AliDielectronPID::kIfAvailable&&!(part->GetStatus()&AliVTrack::kITSpid)) return kTRUE;
269 Double_t mom=part->P();
271 Float_t numberOfSigmas=fPIDResponse->NumberOfSigmasITS(part, fPartType[icut]);
273 // test if we are supposed to use a function for the cut
274 if (fFunUpperCut[icut]) fNsigmaUp[icut] =fFunUpperCut[icut]->Eval(mom);
275 if (fFunLowerCut[icut]) fNsigmaLow[icut]=fFunLowerCut[icut]->Eval(mom);
277 Bool_t selected=((numberOfSigmas>=fNsigmaLow[icut])&&(numberOfSigmas<=fNsigmaUp[icut]))^fExclude[icut];
281 //______________________________________________
282 Bool_t AliDielectronPID::IsSelectedTPC(AliVTrack * const part, Int_t icut)
285 // TPC part of the PID check
286 // Don't accept the track if there was no pid bit set
288 if (fRequirePIDbit[icut]==AliDielectronPID::kRequire&&!(part->GetStatus()&AliVTrack::kTPCpid)) return kFALSE;
289 if (fRequirePIDbit[icut]==AliDielectronPID::kIfAvailable&&!(part->GetStatus()&AliVTrack::kTPCpid)) return kTRUE;
291 Double_t mom=part->GetTPCmomentum();
293 Float_t numberOfSigmas=fPIDResponse->NumberOfSigmasTPC(part, fPartType[icut]);
295 if (fPartType[icut]==AliPID::kElectron){
296 numberOfSigmas-=fgCorr;
299 // test if we are supposed to use a function for the cut
300 if (fFunUpperCut[icut]) fNsigmaUp[icut] =fFunUpperCut[icut]->Eval(mom);
301 if (fFunLowerCut[icut]) fNsigmaLow[icut]=fFunLowerCut[icut]->Eval(mom);
303 Bool_t selected=((numberOfSigmas>=fNsigmaLow[icut])&&(numberOfSigmas<=fNsigmaUp[icut]))^fExclude[icut];
307 //______________________________________________
308 Bool_t AliDielectronPID::IsSelectedTRD(AliVTrack * const part, Int_t icut)
311 // TRD part of the pid check
312 // the TRD checks on the probabilities.
315 if (fRequirePIDbit[icut]==AliDielectronPID::kRequire&&!(part->GetStatus()&AliVTrack::kTRDpid)) return kFALSE;
316 if (fRequirePIDbit[icut]==AliDielectronPID::kIfAvailable&&!(part->GetStatus()&AliVTrack::kTRDpid)) return kTRUE;
317 if (fRequirePIDbit[icut]==AliDielectronPID::kIfAvailable && (part->GetTRDntrackletsPID()<4)) return kTRUE;
319 Double_t p[AliPID::kSPECIES]={0.};
320 fPIDResponse->ComputeTRDProbability(part,AliPID::kSPECIES,p);
321 Float_t particleProb=p[fPartType[icut]];
323 Bool_t selected=((particleProb>=fNsigmaLow[icut])&&(particleProb<=fNsigmaUp[icut]))^fExclude[icut];
327 //______________________________________________
328 Bool_t AliDielectronPID::IsSelectedTRDeleEff(AliVTrack * const part, Int_t icut)
331 // TRD part of the pid check using electron efficiency requirement
332 // in this case the upper limit as well as the particle specie is ignored
333 // and the lower limit regarded as the requested electron efficiency
336 if (fRequirePIDbit[icut]==AliDielectronPID::kRequire&&!(part->GetStatus()&AliVTrack::kTRDpid)) return kFALSE;
337 if (fRequirePIDbit[icut]==AliDielectronPID::kIfAvailable&&!(part->GetStatus()&AliVTrack::kTRDpid)) return kTRUE;
339 Bool_t selected=fPIDResponse->IdentifiedAsElectronTRD(part,fNsigmaLow[icut])^fExclude[icut];
343 //______________________________________________
344 Bool_t AliDielectronPID::IsSelectedTOF(AliVTrack * const part, Int_t icut)
347 // TOF part of the PID check
348 // Don't accept the track if there was no pid bit set
351 if (fRequirePIDbit[icut]==AliDielectronPID::kRequire&&!(part->GetStatus()&AliVTrack::kTOFpid)) return kFALSE;
352 if (fRequirePIDbit[icut]==AliDielectronPID::kIfAvailable&&!(part->GetStatus()&AliVTrack::kTOFpid)) return kTRUE;
354 Float_t numberOfSigmas=fPIDResponse->NumberOfSigmasTOF(part, fPartType[icut]);
356 Bool_t selected=((numberOfSigmas>=fNsigmaLow[icut])&&(numberOfSigmas<=fNsigmaUp[icut]))^fExclude[icut];
360 //______________________________________________
361 Bool_t AliDielectronPID::IsSelectedEMCAL(AliVTrack * const part, Int_t icut)
364 // emcal pid selecttion
367 //TODO: correct way to check for emcal pid?
368 Float_t numberOfSigmas=fPIDResponse->NumberOfSigmasEMCAL(part, fPartType[icut]);
370 Bool_t hasPID=numberOfSigmas>-998.;
372 if (fRequirePIDbit[icut]==AliDielectronPID::kRequire&&!hasPID) return kFALSE;
373 if (fRequirePIDbit[icut]==AliDielectronPID::kIfAvailable&&!hasPID) return kTRUE;
376 Bool_t selected=((numberOfSigmas>=fNsigmaLow[icut])&&(numberOfSigmas<=fNsigmaUp[icut]))^fExclude[icut];
380 //______________________________________________
381 void AliDielectronPID::SetDefaults(Int_t def){
383 // initialise default pid strategies
389 // - exclude mu,K,pi,p
391 AddCut(kTPC,AliPID::kElectron,2);
392 AddCut(kTPC,AliPID::kMuon,-2.,2.,0.,0.,kTRUE);
393 AddCut(kTPC,AliPID::kPion,-2.,2.,0.,0.,kTRUE);
394 AddCut(kTPC,AliPID::kKaon,-2.,2.,0.,0.,kTRUE);
395 AddCut(kTPC,AliPID::kProton,-2.,2.,0.,0.,kTRUE);
398 // - include e 0<p<inf
399 // - exclude mu,K,pi,p 0<p<2
400 AddCut(kTPC,AliPID::kElectron,2.);
401 AddCut(kTPC,AliPID::kMuon,-2.,2.,0.,2.,kTRUE);
402 AddCut(kTPC,AliPID::kPion,-2.,2.,0.,2.,kTRUE);
403 AddCut(kTPC,AliPID::kKaon,-2.,2.,0.,2.,kTRUE);
404 AddCut(kTPC,AliPID::kProton,-2.,2.,0.,2.,kTRUE);
407 // include 2sigma e TPC
410 AddCut(kTPC,AliPID::kElectron,-3.,3.);
411 AddCut(kTPC,AliPID::kPion,-3.,3.,0.,0.,kTRUE);
412 AddCut(kTPC,AliPID::kProton,-3.,3.,0.,0.,kTRUE);
414 } else if (def==3 || def==4) { // def3 and def4 are the same??
415 // include 2sigma e TPC
419 AddCut(kTPC,AliPID::kElectron,2);
420 AddCut(kTOF,AliPID::kKaon,-3.,3.,0.,1.,kTRUE);
421 AddCut(kTOF,AliPID::kProton,-6.,6.,0.,1.,kTRUE);
422 AddCut(kTOF,AliPID::kProton,-3.,3.,1.,2.,kTRUE);
425 AddCut(kTPC,AliPID::kElectron,-0.5,3);
426 AddCut(kTOF,AliPID::kElectron,-3,3,0,1.5);
428 // lower cut TPC: parametrisation by HFE
429 // upper cut TPC: 3 sigma
430 // TOF ele band 3sigma 0<p<1.5GeV
431 TF1 *lowerCut=new TF1("lowerCut", "[0] * TMath::Exp([1]*x)", 0, 100);
432 lowerCut->SetParameters(-2.7,-0.4357);
433 AddCut(kTPC,AliPID::kElectron,lowerCut,3.);
434 AddCut(kTOF,AliPID::kElectron,-3,3,0,1.5);
437 // TOF ele band 3sigma 0<p<1.5GeV
438 AddCut(kTPC,AliPID::kElectron,10.);
439 AddCut(kTOF,AliPID::kElectron,-3,3,0,1.5);
441 // TOF 5 sigma inclusion if TOFpid available
442 // this should reduce K,p,Pi to a large extent
443 AddCut(kTOF,AliPID::kElectron,-5,5,0,200,kFALSE,AliDielectronPID::kIfAvailable);
445 // lower cut TPC: parametrisation by HFE
446 // upper cut TPC: 3 sigma
447 // TOF 5 sigma inclusion if TOFpid available
448 // this should reduce K,p,Pi to a large extent
449 TF1 *lowerCut=new TF1("lowerCut", "[0] * TMath::Exp([1]*x)", 0, 100);
450 lowerCut->SetParameters(-2.65,-0.6757);
451 AddCut(kTPC,AliPID::kElectron,lowerCut,4.);
452 AddCut(kTOF,AliPID::kElectron,-5,5,0,200,kFALSE,AliDielectronPID::kIfAvailable);
454 } else if (def==10) {
455 AddCut(kTOF,AliPID::kElectron,-5,5,0,200,kFALSE,AliDielectronPID::kIfAvailable);
456 AddCut(kTPC,AliPID::kElectron,3.);
457 AddCut(kTPC,AliPID::kPion,-3.,3.,0.,0.,kTRUE);
458 AddCut(kTPC,AliPID::kProton,-3.,3.,0.,0.,kTRUE);
460 } else if (def==11) {
461 // lower cut TPC: parametrisation by HFE
462 // only use from period d on !!
463 // upper cut TPC: 3 sigma
464 // TOF ele band 3sigma 0<p<2.0GeV
465 TF1 *lowerCut=new TF1("lowerCut", "[0] * TMath::Exp([1]*x)+[2]", 0, 100);
466 lowerCut->SetParameters(-3.718,-0.4,0.27);
467 AddCut(kTPC,AliPID::kElectron,lowerCut,3.);
468 AddCut(kTOF,AliPID::kElectron,-3,3,0,2.);
469 } else if (def==12) {
470 // lower cut TPC: parametrisation by HFE
471 // only use from period d on !!
472 // upper cut TPC: 3 sigma
473 // TOF 5 sigma inclusion if TOFpid available
474 // this should reduce K,p,Pi to a large extent
475 TF1 *lowerCut=new TF1("lowerCut", "[0] * TMath::Exp([1]*x)+[2]", 0, 100);
476 lowerCut->SetParameters(-3.718,-0.4,0.27);
477 AddCut(kTPC,AliPID::kElectron,lowerCut,4.);
478 AddCut(kTOF,AliPID::kElectron,-5,5,0,200,kFALSE,AliDielectronPID::kIfAvailable);
483 //______________________________________________
484 void AliDielectronPID::SetCorrVal(Double_t run)
487 // set correction value for run
493 fgCorr=fgFitCorr->Eval(run);
494 if (run<fgFitCorr->GetX()[0]) fgCorr=fgFitCorr->GetY()[0];
495 if (run>fgFitCorr->GetX()[fgFitCorr->GetN()-1]) fgCorr=fgFitCorr->GetY()[fgFitCorr->GetN()-1];
499 fgCorrdEdx=fgdEdxRunCorr->Eval(run);
500 if (run<fgdEdxRunCorr->GetX()[0]) fgCorrdEdx=fgdEdxRunCorr->GetY()[0];
501 if (run>fgdEdxRunCorr->GetX()[fgFitCorr->GetN()-1]) fgCorrdEdx=fgdEdxRunCorr->GetY()[fgdEdxRunCorr->GetN()-1];
505 //______________________________________________
506 Double_t AliDielectronPID::GetEtaCorr(AliVTrack *track)
509 // return eta correction
511 if (!fgFunEtaCorr) return 1;
512 return fgFunEtaCorr->Eval(track->Eta());