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, proviyaded 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 purapose. It is *
13 * provided "as is" without express or implied warranty. *
14 **************************************************************************/
16 //////////////////////////////////////////////////////////////////////////////
18 // Analysis task for the systematic study of the uncertainties related to //
19 // the tracking and ITS-TPC matching efficiency for different particle //
22 //////////////////////////////////////////////////////////////////////////////
25 #include "Riostream.h"
32 #include "TParticlePDG.h"
34 #include "AliAnalysisTaskSE.h"
35 #include "AliAnalysisManager.h"
37 #include "AliESDtrackCuts.h"
38 #include "AliESDVertex.h"
39 #include "AliESDEvent.h"
40 #include "AliESDInputHandler.h"
41 #include "AliESDtrack.h"
42 #include "AliESDpid.h"
43 #include "AliESDUtils.h"
44 #include "AliMCEventHandler.h"
45 #include "AliMCEvent.h"
49 #include "AliAnalysisTrackingUncertainties.h"
52 ClassImp(AliAnalysisTrackingUncertainties)
54 // histogram constants
55 const Int_t kNumberOfAxes = 5;
57 //________________________________________________________________________
58 AliAnalysisTrackingUncertainties::AliAnalysisTrackingUncertainties()
59 : AliAnalysisTaskSE("TaskTestPA"),
69 // default Constructor
70 /* fast compilation test
72 gSystem->Load("libANALYSIS");
73 gSystem->Load("libANALYSISalice");
74 .L AliAnalysisTrackingUncertainties.cxx++
79 //________________________________________________________________________
80 AliAnalysisTrackingUncertainties::AliAnalysisTrackingUncertainties(const char *name)
81 : AliAnalysisTaskSE(name),
92 // standard constructur which should be used
98 fESDtrackCuts = new AliESDtrackCuts("AliESDtrackCuts","AliESDtrackCuts");
99 fESDtrackCuts = AliESDtrackCuts::GetStandardITSTPCTrackCuts2010(kTRUE);
100 fESDtrackCuts->SetEtaRange(-1., 1.);
102 // analysis utils if needed
104 fUtils = new AliAnalysisUtils();
107 // Output slot #0 writes into a TList container
108 DefineOutput(1, TList::Class());
113 //________________________________________________________________________
114 void AliAnalysisTrackingUncertainties::UserCreateOutputObjects()
120 fListHist = new TList();
121 fListHist->SetOwner(kTRUE);
123 // (1.) basic QA and statistics histograms
125 TH2F * histVertexSelection = new TH2F("histVertexSelection", "vertex selection; vertex z (cm); accepted/rejected", 100, -50., 50., 2, -0.5, 1.5);
126 fListHist->Add(histVertexSelection);
128 // (2.) track cut variation histograms
130 InitializeTrackCutHistograms();
132 // (3.) ITS -> TPC matching histograms
134 Int_t binsMatch[kNumberOfAxes] = { 10, 50, 20, 18, 6};
135 Double_t minMatch[kNumberOfAxes] = { 0, 0.1, -1, 0, -0.5};
136 Double_t maxMatch[kNumberOfAxes] = {200, 20, +1, 2*TMath::Pi(), 5.5};
138 TString axisNameMatch[kNumberOfAxes] = {"matchChi2","pT","eta","phi","pid"};
139 TString axisTitleMatch[kNumberOfAxes] = {"matchChi2","pT","eta","phi","pid"};
141 THnF * hBestMatch = new THnF("hBestMatch","ITS -> TPC matching ",kNumberOfAxes, binsMatch, minMatch, maxMatch);
142 for (Int_t iaxis=0; iaxis<kNumberOfAxes;iaxis++){
143 hBestMatch->GetAxis(iaxis)->SetName(axisNameMatch[iaxis]);
144 hBestMatch->GetAxis(iaxis)->SetTitle(axisTitleMatch[iaxis]);
146 BinLogAxis(hBestMatch, 1);
147 fListHist->Add(hBestMatch);
152 const double ptMax=5;
154 TH2F * hNMatch = new TH2F("hNMatch","N Matches",nbPt,0,ptMax,kMaxMatch+1,-0.5,kMaxMatch+0.5);
155 TH2F * hAllMatch = new TH2F("hAllMatch","All Matches Chi2",nbPt,0,ptMax,2*int(TMath::Max(1.1,kMaxChi2)),0,kMaxChi2);
156 TH2F * hAllMatchGlo = new TH2F("hAllMatchGlo","All Matches Chi2",nbPt,0,ptMax,2*int(TMath::Max(1.1,kMaxChi2)),0,kMaxChi2);
157 fListHist->Add(hNMatch);
158 fListHist->Add(hAllMatch);
159 fListHist->Add(hAllMatchGlo);
161 TH2F * hNMatchBg = new TH2F("hNMatchBg","N Matches",nbPt,0,ptMax,kMaxMatch+1,-0.5,kMaxMatch+0.5);
162 TH2F * hBestMatchBg = new TH2F("hBestMatchBg","Best Match Chi2",nbPt,0,ptMax,2*int(TMath::Max(1.1,kMaxChi2)),0,kMaxChi2);
163 TH2F * hAllMatchBg = new TH2F("hAllMatchBg","All Matches Chi2",nbPt,0,ptMax,2*int(TMath::Max(1.1,kMaxChi2)),0,kMaxChi2);
164 TH2F * hAllMatchGloBg = new TH2F("hAllMatchGloBg","All Matches Chi2",nbPt,0,ptMax,2*int(TMath::Max(1.1,kMaxChi2)),0,kMaxChi2);
165 fListHist->Add(hNMatchBg);
166 fListHist->Add(hBestMatchBg);
167 fListHist->Add(hAllMatchBg);
168 fListHist->Add(hAllMatchGloBg);
169 //add default track cuts in the output list
170 fListHist->Add(fESDtrackCuts);
174 PostData(1, fListHist);
181 //________________________________________________________________________
182 void AliAnalysisTrackingUncertainties::UserExec(Option_t *)
187 fESD = dynamic_cast<AliESDEvent*>( InputEvent() );
189 PostData(1, fListHist);
193 if (!fESDpid) fESDpid = ((AliESDInputHandler*)(AliAnalysisManager::GetAnalysisManager()->GetInputEventHandler()))->GetESDpid();
195 // Check Monte Carlo information and other access first:
197 AliMCEventHandler* eventHandler = dynamic_cast<AliMCEventHandler*> (AliAnalysisManager::GetAnalysisManager()->GetMCtruthEventHandler());
202 // extract generated particles information
204 AliMCEvent* mcEvent = 0x0;
205 AliStack* stack = 0x0;
206 if (eventHandler) mcEvent = eventHandler->MCEvent();
212 stack = mcEvent->Stack();
215 for(Int_t i = 0; i < stack->GetNtrack(); i++) {
216 /* at the moment nothing is needed here
217 TParticle * trackMC = stack->Particle(i);
218 Double_t rap = trackMC->Eta();
219 Double_t y = trackMC->Y();
220 Double_t pT = trackMC->Pt();
227 if (!fESDtrackCuts) {
228 PostData(1, fListHist);
232 // monitor vertex position and selection
234 TH2F * histVertexSelection = (TH2F *) fListHist->FindObject("histVertexSelection");
236 Float_t vertexZ = 0.;
237 if (IsVertexAccepted(fESD, vertexZ)) {
238 histVertexSelection->Fill(vertexZ, 0);
240 histVertexSelection->Fill(vertexZ, 1);
244 // fill track cut variation histograms
246 ProcessTrackCutVariation();
248 // fill ITS->TPC matching histograms
250 ProcessItsTpcMatching();
253 PostData(1, fListHist);
258 //________________________________________________________________________
259 void AliAnalysisTrackingUncertainties::ProcessItsTpcMatching(){
261 // check how many its-sa tracks get matched to TPC
263 int ntr = fESD->GetNumberOfTracks();
265 // initialize histograms
267 TH2F * hNMatch = (TH2F*) fListHist->FindObject("hNMatch");
268 THnF * hBestMatch = (THnF*) fListHist->FindObject("hBestMatch");
269 TH2F * hAllMatch = (TH2F*) fListHist->FindObject("hAllMatch");
270 TH2F * hAllMatchGlo = (TH2F*) fListHist->FindObject("hAllMatchGlo");
272 TH2F * hNMatchBg = (TH2F*) fListHist->FindObject("hNMatchBg");
273 TH2F * hBestMatchBg = (TH2F*) fListHist->FindObject("hBestMatchBg");
274 TH2F * hAllMatchBg = (TH2F*) fListHist->FindObject("hAllMatchBg");
275 TH2F * hAllMatchGloBg = (TH2F*) fListHist->FindObject("hAllMatchGloBg");
277 for (int it=0;it<ntr;it++) {
278 AliESDtrack* trSA = fESD->GetTrack(it);
279 if (!trSA->IsOn(AliESDtrack::kITSpureSA) || !trSA->IsOn(AliESDtrack::kITSrefit)) continue;
280 double pt = trSA->Pt();
283 for (int i=kMaxMatch;i--;) {fMatchChi[i]=0; fMatchTr[i]=0;} // reset array
284 for (int it1=0;it1<ntr;it1++) {
285 if (it1==it) continue;
286 AliESDtrack* trESD = fESD->GetTrack(it1);
287 if (!trESD->IsOn(AliESDtrack::kTPCrefit)) continue;
288 Match(trSA,trESD, nmatch);
291 hNMatch->Fill(pt,nmatch);
292 if (nmatch>0) { // matched tracks
293 Double_t vecHistMatch[kNumberOfAxes] = {fMatchChi[0], pt, trSA->Eta(), trSA->Phi(), 0};
294 hBestMatch->Fill(vecHistMatch);
295 } else { // un-matched tracks -> should be in overflow bin
296 Double_t vecHistMatch[kNumberOfAxes] = {9999999., pt, trSA->Eta(), trSA->Phi(), 0};
297 hBestMatch->Fill(vecHistMatch);
300 for (int imt=nmatch;imt--;) {
301 hAllMatch->Fill(pt,fMatchChi[imt]);
302 if (fMatchTr[imt]->IsOn(AliESDtrack::kITSrefit)) hAllMatchGlo->Fill(pt,fMatchChi[imt]);
306 for (int i=kMaxMatch;i--;) {fMatchChi[i]=0; fMatchTr[i]=0;}
307 for (int it1=0;it1<ntr;it1++) {
308 if (it1==it) continue;
309 AliESDtrack* trESD = fESD->GetTrack(it1);
310 if (!trESD->IsOn(AliESDtrack::kTPCrefit)) continue;
311 Match(trSA,trESD, nmatch, TMath::Pi());
314 hNMatchBg->Fill(pt,nmatch);
315 if (nmatch>0) hBestMatchBg->Fill(pt,fMatchChi[0]);
316 for (int imt=nmatch;imt--;) {
317 hAllMatchBg->Fill(pt,fMatchChi[imt]);
318 if (fMatchTr[imt]->IsOn(AliESDtrack::kITSrefit)) hAllMatchGloBg->Fill(pt,fMatchChi[imt]);
327 void AliAnalysisTrackingUncertainties::Match(const AliESDtrack* tr0, const AliESDtrack* tr1, Int_t &nmatch, Double_t rotate) {
329 // check if two tracks are matching, possible rotation for combinatoric backgr.
331 Float_t bField = fESD->GetMagneticField();
333 const AliExternalTrackParam* trtpc0 = tr1->GetInnerParam();
335 AliExternalTrackParam trtpc(*trtpc0);
337 if (TMath::Abs(rotate)>1e-5) {
338 const double *par = trtpc.GetParameter();
339 const double *cov = trtpc.GetCovariance();
340 double alp = trtpc.GetAlpha() + rotate;
341 trtpc.Set(trtpc.GetX(),alp,par,cov);
344 if (!trtpc.Rotate(tr0->GetAlpha())) return;
345 if (!trtpc.PropagateTo(tr0->GetX(),bField)) return;
346 double chi2 = tr0->GetPredictedChi2(&trtpc);
347 if (chi2>kMaxChi2) return;
350 for (ins=0;ins<nmatch;ins++) if (chi2<fMatchChi[ins]) break;
351 if (ins>=kMaxMatch) return;
353 for (int imv=nmatch;imv>ins;imv--) {
354 if (imv>=kMaxMatch) continue;
355 fMatchTr[imv] = fMatchTr[imv-1];
356 fMatchChi[imv] = fMatchChi[imv-1];
359 fMatchChi[ins] = chi2;
361 if (nmatch>=kMaxMatch) nmatch = kMaxMatch;
366 //________________________________________________________________________
367 void AliAnalysisTrackingUncertainties::ProcessTrackCutVariation() {
369 // fill track cut variation histograms - undo cuts step-by-step and fill histograms
372 // initialize histograms
374 THnF * histNcl = (THnF *) fListHist->FindObject("histNcl");
375 THnF * histChi2Tpc = (THnF *) fListHist->FindObject("histChi2Tpc");
376 THnF * histDcaZ = (THnF *) fListHist->FindObject("histDcaZ");
377 THnF * histSpd = (THnF *) fListHist->FindObject("histSpd");
378 THnF * histNcr = (THnF *) fListHist->FindObject("histNcr");
379 THnF * histCRoverFC = (THnF *) fListHist->FindObject("histCRoverFC");
380 THnF * histChi2Its = (THnF *) fListHist->FindObject("histChi2Its");
381 THnF * histTpcLength = (THnF *) fListHist->FindObject("histTpcLength");
382 THnF * histTpcItsMatch = (THnF *) fListHist->FindObject("histTpcItsMatch");
384 Float_t dca[2], cov[3]; // dca_xy, dca_z, sigma_xy, sigma_xy_z, sigma_z for the vertex cut
386 for (Int_t i=0;i<fESD->GetNumberOfTracks();++i) {
388 AliESDtrack *track =fESD->GetTrack(i);
390 // relevant variables
392 //Double_t pid = Double_t(GetPid(track));
394 Int_t nclsTPC = track->GetTPCncls();
395 Float_t pT = track->Pt();
396 Float_t eta = track->Eta();
397 Float_t phi = track->Phi();
398 Float_t chi2TPC = track->GetTPCchi2();
399 Float_t ncrTPC = track->GetTPCCrossedRows();
400 Int_t nclsTPCF = track->GetTPCNclsF();
401 Float_t nCRoverFC = track->GetTPCCrossedRows();
402 Double_t chi2ITS = track->GetITSchi2();
403 Int_t nclsITS = track->GetITSclusters(0);
404 Float_t tpcLength = 0.;
406 if (track->GetInnerParam() && track->GetESDEvent()) {
407 tpcLength = track->GetLengthInActiveZone(1, 1.8, 220, track->GetESDEvent()->GetMagneticField());
417 nCRoverFC /= nclsTPCF;
428 track->GetImpactParameters(dca, cov);
430 // (1.) fill number of clusters histogram
432 Int_t minNclsTPC = fESDtrackCuts->GetMinNClusterTPC();
433 fESDtrackCuts->SetMinNClustersTPC(0);
434 if (fESDtrackCuts->AcceptTrack(track)) {
435 for(Int_t iPid = 0; iPid < 6; iPid++) {
436 Double_t vecHistNcl[kNumberOfAxes] = {nclsTPC, pT, eta, phi, iPid};
437 if (IsConsistentWithPid(iPid, track)) histNcl->Fill(vecHistNcl);
440 fESDtrackCuts->SetMinNClustersTPC(minNclsTPC);
442 // (2.) fill chi2 TPC histogram
444 Float_t maxChi2 = fESDtrackCuts->GetMaxChi2PerClusterTPC();
445 fESDtrackCuts->SetMaxChi2PerClusterTPC(999.);
446 if (fESDtrackCuts->AcceptTrack(track)) {
447 for(Int_t iPid = 0; iPid < 6; iPid++) {
448 Double_t vecHistChi2Tpc[kNumberOfAxes] = {chi2TPC, pT, eta, phi, iPid};
449 if (IsConsistentWithPid(iPid, track)) histChi2Tpc->Fill(vecHistChi2Tpc);
452 fESDtrackCuts->SetMaxChi2PerClusterTPC(maxChi2);
454 // (3.) fill dca_z histogram
456 Float_t maxDcaZ = fESDtrackCuts->GetMaxDCAToVertexZ();
457 fESDtrackCuts->SetMaxDCAToVertexZ(999.);
458 if (fESDtrackCuts->AcceptTrack(track)) {
459 for(Int_t iPid = 0; iPid < 6; iPid++) {
460 Double_t vecHistDcaZ[kNumberOfAxes] = {TMath::Abs(dca[1]), pT, eta, phi, iPid};
461 if (IsConsistentWithPid(iPid, track)) histDcaZ->Fill(vecHistDcaZ);
464 fESDtrackCuts->SetMaxDCAToVertexZ(maxDcaZ);
466 // (4.) fill hit in SPD histogram
468 fESDtrackCuts->SetClusterRequirementITS(AliESDtrackCuts::kSPD, AliESDtrackCuts::kOff);
469 if (fESDtrackCuts->AcceptTrack(track)) {
471 if (track->HasPointOnITSLayer(0) || track->HasPointOnITSLayer(1)) hasPoint = 1;
472 for(Int_t iPid = 0; iPid < 6; iPid++) {
473 Double_t vecHistSpd[kNumberOfAxes] = {hasPoint, pT, eta, phi, iPid};
474 if (IsConsistentWithPid(iPid, track)) histSpd->Fill(vecHistSpd);
477 fESDtrackCuts->SetClusterRequirementITS(AliESDtrackCuts::kSPD, AliESDtrackCuts::kAny);
479 // (5.) fill number of crossed rows histogram
481 //Int_t minNcrTPC = fESDtrackCuts->GetMinNCrossedRowsTPC(); //wait for getter in ESDtrackCuts
482 Int_t minNcrTPC = 0; //for now use standard value from 2010 !!
483 fESDtrackCuts->SetMinNCrossedRowsTPC(0);
484 if (fESDtrackCuts->AcceptTrack(track)) {
485 for(Int_t iPid = 0; iPid < 6; iPid++) {
486 Double_t vecHistNcr[kNumberOfAxes] = {ncrTPC, pT, eta, phi, iPid};
487 if (IsConsistentWithPid(iPid, track)) histNcr->Fill(vecHistNcr);
490 fESDtrackCuts->SetMinNCrossedRowsTPC(minNcrTPC);
492 // (6.) fill crossed rows over findable clusters histogram
494 //Int_t minCRoverFC = fESDtrackCuts->GetMinRatioCrossedRowsOverFindableClustersTPC(); //wait for getter in ESDtrackCuts
495 Int_t minCRoverFC = 0.; //for now use standard value from 2010 !!
496 fESDtrackCuts->SetMinRatioCrossedRowsOverFindableClustersTPC(0.);
497 if (fESDtrackCuts->AcceptTrack(track)) {
498 for(Int_t iPid = 0; iPid < 6; iPid++) {
499 Double_t vecHistCRoverFC[kNumberOfAxes] = {nCRoverFC, pT, eta, phi, iPid};
500 if (IsConsistentWithPid(iPid, track)) histCRoverFC->Fill(vecHistCRoverFC);
503 fESDtrackCuts->SetMinRatioCrossedRowsOverFindableClustersTPC(minCRoverFC);
505 // (7.) fill chi2 ITS histogram
507 Float_t maxChi2ITS = fESDtrackCuts->GetMaxChi2PerClusterITS();
508 fESDtrackCuts->SetMaxChi2PerClusterITS(999.);
509 if (fESDtrackCuts->AcceptTrack(track)) {
510 for(Int_t iPid = 0; iPid < 6; iPid++) {
511 Double_t vecHistChi2ITS[kNumberOfAxes] = {chi2ITS, pT, eta, phi, iPid};
512 if (IsConsistentWithPid(iPid, track)) histChi2Its->Fill(vecHistChi2ITS);
515 fESDtrackCuts->SetMaxChi2PerClusterITS(maxChi2ITS);
517 // (8.) fill active length in TPC histogram
519 Int_t minTpcLength = fESDtrackCuts->GetMinLengthActiveVolumeTPC();
520 fESDtrackCuts->SetMinLengthActiveVolumeTPC(0);
521 if (fESDtrackCuts->AcceptTrack(track)) {
522 for(Int_t iPid = 0; iPid < 6; iPid++) {
523 Double_t vecHistTpcLength[kNumberOfAxes] = {tpcLength, pT, eta, phi, iPid};
524 if (IsConsistentWithPid(iPid, track)) histTpcLength->Fill(vecHistTpcLength);
527 fESDtrackCuts->SetMinLengthActiveVolumeTPC(minTpcLength);
529 // (9.) fill TPC->ITS matching efficiency histogram
531 Bool_t isMatched = kFALSE;
532 // remove all ITS requirements
534 // Leonardo and Emilia:
535 // -> if MC is available: fill it only for true primaries,
536 // --to be done for every cut?
537 // -> Postprocessing: plot histogram with 1 divided by histogram with 0 as a function of pT/eta/phi
538 // -> Do we want to remove the DCA cut?
539 Bool_t refit=fESDtrackCuts->GetRequireITSRefit();
540 Float_t chi2tpc= fESDtrackCuts->GetMaxChi2TPCConstrainedGlobal();
541 Float_t chi2its= fESDtrackCuts->GetMaxChi2PerClusterITS();
542 //TString str = fESDtrackCuts->GetMaxDCAToVertexXYPtDep();
544 fESDtrackCuts->SetRequireITSRefit(kFALSE);
545 fESDtrackCuts->SetMaxChi2TPCConstrainedGlobal(99999.);
546 fESDtrackCuts->SetMaxChi2PerClusterITS(999999.);
547 //TString str = fESDtrackCuts->GetMaxDCAToVertexXYPtDep();
548 //fESDtrackCuts->SetMaxDCAToVertexXYPtDep();
549 fESDtrackCuts->SetClusterRequirementITS(AliESDtrackCuts::kSPD, AliESDtrackCuts::kOff);
551 if (fESDtrackCuts->AcceptTrack(track)) {
552 for(Int_t iPid = 0; iPid < 6; iPid++) {
553 Double_t vecHistTpcItsMatch[kNumberOfAxes] = {isMatched, pT, eta, phi, iPid};
554 if (IsConsistentWithPid(iPid, track)) histTpcItsMatch->Fill(vecHistTpcItsMatch); // fill with 1 here
557 //apply back the cuts
558 fESDtrackCuts->SetRequireITSRefit(refit);
559 fESDtrackCuts->SetMaxChi2TPCConstrainedGlobal(chi2tpc);
560 fESDtrackCuts->SetMaxChi2PerClusterITS(chi2its);
561 //fESDtrackCuts->SetMaxDCAToVertexXYPtDep(str.Data());
562 fESDtrackCuts->SetClusterRequirementITS(AliESDtrackCuts::kSPD,AliESDtrackCuts::kAny);
565 if (fESDtrackCuts->AcceptTrack(track)) {
566 for(Int_t iPid = 0; iPid < 6; iPid++) {
567 Double_t vecHistTpcItsMatch[kNumberOfAxes] = {isMatched, pT, eta, phi, iPid};
568 if (IsConsistentWithPid(iPid, track)) histTpcItsMatch->Fill(vecHistTpcItsMatch); // fill with 0 here
572 } // end of track loop
579 //________________________________________________________________________
580 void AliAnalysisTrackingUncertainties::Terminate(Option_t *)
582 // Draw result to the screen
583 // Called once at the end of the query
589 //________________________________________________________________________
590 void AliAnalysisTrackingUncertainties::BinLogAxis(const THn *h, Int_t axisNumber) {
592 // Method for the correct logarithmic binning of histograms
594 TAxis *axis = h->GetAxis(axisNumber);
595 int bins = axis->GetNbins();
597 Double_t from = axis->GetXmin();
598 Double_t to = axis->GetXmax();
599 Double_t *newBins = new Double_t[bins + 1];
602 Double_t factor = pow(to/from, 1./bins);
604 for (int i = 1; i <= bins; i++) {
605 newBins[i] = factor * newBins[i-1];
607 axis->Set(bins, newBins);
613 //________________________________________________________________________
614 Bool_t AliAnalysisTrackingUncertainties::IsVertexAccepted(AliESDEvent * esd, Float_t &vertexZ) {
616 // function to check if a proper vertex is reconstructed and write z-position in vertexZ
619 Bool_t vertexOkay = kFALSE;
620 const AliESDVertex *vertex = esd->GetPrimaryVertexTracks();
621 if (vertex->GetNContributors() < 1) {
623 vertex = esd->GetPrimaryVertexSPD();
624 if (vertex->GetNContributors() < 1) {
625 vertexOkay = kFALSE; }
630 TString vtxTyp = vertex->GetTitle();
632 vertex->GetCovarianceMatrix(cov);
633 Double_t zRes = TMath::Sqrt(cov[5]);
634 if (vtxTyp.Contains("vertexer:Z") && (zRes>0.25)) vertexOkay = kFALSE;
640 vertexZ = vertex->GetZ();
645 //________________________________________________________________________
646 AliAnalysisTrackingUncertainties::ESpecies_t AliAnalysisTrackingUncertainties::GetPid(const AliESDtrack * const tr, Bool_t useTPCTOF) const {
648 // Determine particle species for a given track
649 // Two approaches can be used: As default the selection is done using TPC-only, in addition
650 // the TOF usage is optional. In case of TPC-TOF, a valid TOF signal has to be provided for
651 // the given track. The identification is delegated to helper function for each species.
652 // Tracks which are selected as more than one species (ambiguous decision) are rejected.
654 // @Return: Particles species (kUndef in case no identification is possible)
656 if(!fESDpid) return kUndef;
657 if(useTPCTOF && !(tr->GetStatus() & AliVTrack::kTOFpid)) return kUndef;
659 Bool_t isElectron(kFALSE), isPion(kFALSE), isKaon(kFALSE), isProton(kFALSE);
661 if((isElectron = IsElectron(tr, useTPCTOF))) nspec++;
662 if((isPion = IsPion(tr, useTPCTOF))) nspec++;
663 if((isKaon = IsKaon(tr, useTPCTOF))) nspec++;
664 if((isProton = IsProton(tr,useTPCTOF))) nspec++;
665 if(nspec != 1) return kUndef; // No decision or ambiguous decision;
666 if(isElectron) return kSpecElectron;
667 if(isPion) return kSpecPion;
668 if(isProton) return kSpecProton;
669 if(isKaon) return kSpecKaon;
673 //________________________________________________________________________
674 Bool_t AliAnalysisTrackingUncertainties::IsElectron(const AliESDtrack * const tr, Bool_t useTPCTOF) const {
676 // Selection of electron candidates using the upper half of the TPC sigma band, starting at
677 // the mean ignoring its shift, and going up to 3 sigma above the mean. In case TOF information
678 // is available, tracks which are incompatible with electrons within 3 sigma are rejected. If
679 // no TOF information is used, the momentum regions where the kaon and the proton line cross
680 // the electron line are cut out using a 3 sigma cut around the kaon or proton line.
683 Float_t nsigmaElectronTPC = fESDpid->NumberOfSigmasTPC(tr, AliPID::kElectron);
684 if(nsigmaElectronTPC < 0 || nsigmaElectronTPC > 3) return kFALSE;
687 Float_t nsigmaElectronTOF = fESDpid->NumberOfSigmasTOF(tr, AliPID::kElectron);
688 if(TMath::Abs(nsigmaElectronTOF) > 3) return kFALSE;
691 Float_t nsigmaKaonTPC = fESDpid->NumberOfSigmasTPC(tr, AliPID::kKaon),
692 nsigmaProtonTPC =fESDpid->NumberOfSigmasTPC(tr, AliPID::kProton);
693 if(TMath::Abs(nsigmaKaonTPC < 3) || TMath::Abs(nsigmaProtonTPC < 3)) return kFALSE;
698 //________________________________________________________________________
699 Bool_t AliAnalysisTrackingUncertainties::IsConsistentWithPid(Int_t type, const AliESDtrack * const tr) {
701 // just check if the PID is consistent with a given hypothesis in order to
702 // investigate effects which are only dependent on the energy loss.
704 if (type == kSpecPion) return IsPion(tr);
705 if (type == kSpecKaon) return IsKaon(tr);
706 if (type == kSpecProton) return IsProton(tr);
707 if (type == kSpecElectron) return IsElectron(tr);
708 if (type == kAll) return kTRUE;
713 //________________________________________________________________________
714 Bool_t AliAnalysisTrackingUncertainties::IsPion(const AliESDtrack * const tr, Bool_t /*useTPCPTOF*/) const{
716 // Selectron of pion candidates
717 // @TODO: To be implemented
719 Float_t nsigmaPionTPC = fESDpid->NumberOfSigmasTPC(tr, AliPID::kPion);
720 if (TMath::Abs(nsigmaPionTPC) < 3) return kTRUE;
725 //________________________________________________________________________
726 Bool_t AliAnalysisTrackingUncertainties::IsKaon(const AliESDtrack * const tr, Bool_t /*useTPCPTOF*/) const {
728 // Selection of kaon candidates
729 // @TODO: To be implemented
731 Float_t nsigmaKaonTPC = fESDpid->NumberOfSigmasTPC(tr, AliPID::kKaon);
732 if (TMath::Abs(nsigmaKaonTPC) < 3) return kTRUE;
737 //________________________________________________________________________
738 Bool_t AliAnalysisTrackingUncertainties::IsProton(const AliESDtrack * const tr, Bool_t /*useTPCPTOF*/) const{
740 // Selection of proton candidates
741 // @TODO: To be implemented
743 Float_t nsigmaProtonTPC = fESDpid->NumberOfSigmasTPC(tr, AliPID::kProton);
744 if (TMath::Abs(nsigmaProtonTPC) < 3) return kTRUE;
749 //________________________________________________________________________
750 void AliAnalysisTrackingUncertainties::InitializeTrackCutHistograms() {
752 // create histograms for the track cut studies
755 // (1.) number of clusters
756 // 0-ncl, 1-pt, 2-eta, 3-phi, 4-pid(0-3 -> electron-proton, 4 -> undef, 5 -> all)
757 Int_t binsNcl[kNumberOfAxes] = { 40, 50, 20, 18, 6};
758 Double_t minNcl[kNumberOfAxes] = { 20, 0.1, -1, 0, -0.5};
759 Double_t maxNcl[kNumberOfAxes] = {160, 20, +1, 2*TMath::Pi(), 5.5};
761 TString axisNameNcl[kNumberOfAxes] = {"ncl","pT","eta","phi","pid"};
762 TString axisTitleNcl[kNumberOfAxes] = {"ncl","pT","eta","phi","pid"};
764 THnF * histNcl = new THnF("histNcl","number of clusters histogram",kNumberOfAxes, binsNcl, minNcl, maxNcl);
765 BinLogAxis(histNcl, 1);
766 fListHist->Add(histNcl);
768 for (Int_t iaxis=0; iaxis<kNumberOfAxes;iaxis++){
769 histNcl->GetAxis(iaxis)->SetName(axisNameNcl[iaxis]);
770 histNcl->GetAxis(iaxis)->SetTitle(axisTitleNcl[iaxis]);
774 // 0-chi2, 1-pt, 2-eta, 3-phi, 4-pid(0-3 -> electron-proton, 4 -> undef, 5 -> all)
775 Int_t binsChi2Tpc[kNumberOfAxes] = { 40, 50, 20, 18, 6};
776 Double_t minChi2Tpc[kNumberOfAxes] = { 0, 0.1, -1, 0, -0.5};
777 Double_t maxChi2Tpc[kNumberOfAxes] = { 8, 20, +1, 2*TMath::Pi(), 5.5};
779 TString axisNameChi2Tpc[kNumberOfAxes] = {"chi2tpc","pT","eta","phi","pid"};
780 TString axisTitleChi2Tpc[kNumberOfAxes] = {"chi2tpc","pT","eta","phi","pid"};
782 THnF * histChi2Tpc = new THnF("histChi2Tpc","chi2 per cls. in TPC",kNumberOfAxes, binsChi2Tpc, minChi2Tpc, maxChi2Tpc);
783 BinLogAxis(histChi2Tpc, 1);
784 fListHist->Add(histChi2Tpc);
786 for (Int_t iaxis=0; iaxis<kNumberOfAxes;iaxis++){
787 histChi2Tpc->GetAxis(iaxis)->SetName(axisNameChi2Tpc[iaxis]);
788 histChi2Tpc->GetAxis(iaxis)->SetTitle(axisTitleChi2Tpc[iaxis]);
792 // 0-dcaZ, 1-pt, 2-eta, 3-phi, 4-pid(0-3 -> electron-proton, 4 -> undef, 5 -> all)
793 Int_t binsDcaZ[kNumberOfAxes] = { 20, 50, 20, 18, 6};
794 Double_t minDcaZ[kNumberOfAxes] = { 0, 0.1, -1, 0, -0.5};
795 Double_t maxDcaZ[kNumberOfAxes] = { 4, 20, +1, 2*TMath::Pi(), 5.5};
797 TString axisNameDcaZ[kNumberOfAxes] = {"dcaZ","pT","eta","phi","pid"};
798 TString axisTitleDcaZ[kNumberOfAxes] = {"dcaZ","pT","eta","phi","pid"};
800 THnF * histDcaZ = new THnF("histDcaZ","dca_z to prim. vtx.",kNumberOfAxes, binsDcaZ, minDcaZ, maxDcaZ);
801 BinLogAxis(histDcaZ, 1);
802 fListHist->Add(histDcaZ);
804 for (Int_t iaxis=0; iaxis<kNumberOfAxes;iaxis++){
805 histDcaZ->GetAxis(iaxis)->SetName(axisNameDcaZ[iaxis]);
806 histDcaZ->GetAxis(iaxis)->SetTitle(axisTitleDcaZ[iaxis]);
809 // (4.) hit in SPD layer
810 // 0-spdHit, 1-pt, 2-eta, 3-phi, 4-pid(0-3 -> electron-proton, 4 -> undef, 5 -> all)
811 Int_t binsSpd[kNumberOfAxes] = { 2, 50, 20, 18, 6};
812 Double_t minSpd[kNumberOfAxes] = { -0.5, 0.1, -1, 0, -0.5};
813 Double_t maxSpd[kNumberOfAxes] = { 1.5, 20, +1, 2*TMath::Pi(), 5.5};
815 TString axisNameSpd[kNumberOfAxes] = {"spdHit","pT","eta","phi","pid"};
816 TString axisTitleSpd[kNumberOfAxes] = {"spdHit","pT","eta","phi","pid"};
818 THnF * histSpd = new THnF("histSpd","hit in SPD layer or not",kNumberOfAxes, binsSpd, minSpd, maxSpd);
819 BinLogAxis(histSpd, 1);
820 fListHist->Add(histSpd);
822 for (Int_t iaxis=0; iaxis<kNumberOfAxes;iaxis++){
823 histSpd->GetAxis(iaxis)->SetName(axisNameSpd[iaxis]);
824 histSpd->GetAxis(iaxis)->SetTitle(axisTitleSpd[iaxis]);
827 // (5.) number of crossed rows
828 // 0-ncr, 1-pt, 2-eta, 3-phi, 4-pid(0,unid,etc.)
829 Int_t binsNcr[kNumberOfAxes] = { 40, 50, 20, 18, 6};
830 Double_t minNcr[kNumberOfAxes] = { 20, 0.1, -1, 0, -0.5};
831 Double_t maxNcr[kNumberOfAxes] = {160, 20, +1, 2*TMath::Pi(), 5.5};
833 TString axisNameNcr[kNumberOfAxes] = {"Ncr","pT","eta","phi","pid"};
834 TString axisTitleNcr[kNumberOfAxes] = {"Ncr","pT","eta","phi","pid"};
836 THnF * histNcr = new THnF("histNcr","number of crossed rows TPC histogram",kNumberOfAxes, binsNcr, minNcr, maxNcr);
837 BinLogAxis(histNcr, 1);
838 fListHist->Add(histNcr);
840 for (Int_t iaxis=0; iaxis<kNumberOfAxes;iaxis++){
841 histNcr->GetAxis(iaxis)->SetName(axisNameNcr[iaxis]);
842 histNcr->GetAxis(iaxis)->SetTitle(axisTitleNcr[iaxis]);
845 // (6.) ratio crossed rows over findable clusters
846 // 0-CRoverFC, 1-pt, 2-eta, 3-phi, 4-pid(0,unid,etc.)
847 Int_t binsCRoverFC[kNumberOfAxes] = { 26, 50, 20, 18, 6};
848 Double_t minCRoverFC[kNumberOfAxes] = { 0.4, 0.1, -1, 0, -0.5};
849 Double_t maxCRoverFC[kNumberOfAxes] = { 1.8, 20, +1, 2*TMath::Pi(), 5.5};
851 TString axisNameCRoverFC[kNumberOfAxes] = {"CRoverFC","pT","eta","phi","pid"};
852 TString axisTitleCRoverFC[kNumberOfAxes] = {"CRoverFC","pT","eta","phi","pid"};
854 THnF * histCRoverFC = new THnF("histCRoverFC","number of crossed rows over findable clusters histogram",kNumberOfAxes, binsCRoverFC, minCRoverFC, maxCRoverFC);
855 BinLogAxis(histCRoverFC, 1);
856 fListHist->Add(histCRoverFC);
858 for (Int_t iaxis=0; iaxis<kNumberOfAxes;iaxis++){
859 histCRoverFC->GetAxis(iaxis)->SetName(axisNameCRoverFC[iaxis]);
860 histCRoverFC->GetAxis(iaxis)->SetTitle(axisTitleCRoverFC[iaxis]);
863 // (7.) max chi2 / ITS cluster
864 // 0-Chi2Its, 1-pt, 2-eta, 3-phi, 4-pid(0,unid,etc.)
865 Int_t binsChi2Its[kNumberOfAxes] = { 25, 50, 20, 18, 6};
866 Double_t minChi2Its[kNumberOfAxes] = { 0, 0.1, -1, 0, -0.5};
867 Double_t maxChi2Its[kNumberOfAxes] = { 50, 20, +1, 2*TMath::Pi(), 5.5};
869 TString axisNameChi2Its[kNumberOfAxes] = {"Chi2Its","pT","eta","phi","pid"};
870 TString axisTitleChi2Its[kNumberOfAxes] = {"Chi2Its","pT","eta","phi","pid"};
872 THnF * histChi2Its = new THnF("histChi2Its","number of crossed rows TPC histogram",kNumberOfAxes, binsChi2Its, minChi2Its, maxChi2Its);
873 BinLogAxis(histChi2Its, 1);
874 fListHist->Add(histChi2Its);
876 for (Int_t iaxis=0; iaxis<kNumberOfAxes;iaxis++){
877 histChi2Its->GetAxis(iaxis)->SetName(axisNameChi2Its[iaxis]);
878 histChi2Its->GetAxis(iaxis)->SetTitle(axisTitleChi2Its[iaxis]);
881 // (8.) tpc active volume length
882 // 0-TpcLength, 1-pt, 2-eta, 3-phi, 4-pid(0,unid,etc.)
883 Int_t binsTpcLength[kNumberOfAxes] = { 40, 50, 20, 18, 6};
884 Double_t minTpcLength[kNumberOfAxes] = { 0, 0.1, -1, 0, -0.5};
885 Double_t maxTpcLength[kNumberOfAxes] = { 170, 20, +1, 2*TMath::Pi(), 5.5};
887 TString axisNameTpcLength[kNumberOfAxes] = {"TpcLength","pT","eta","phi","pid"};
888 TString axisTitleTpcLength[kNumberOfAxes] = {"TpcLength","pT","eta","phi","pid"};
890 THnF * histTpcLength = new THnF("histTpcLength","number of crossed rows TPC histogram",kNumberOfAxes, binsTpcLength, minTpcLength, maxTpcLength);
891 BinLogAxis(histTpcLength, 1);
892 fListHist->Add(histTpcLength);
894 for (Int_t iaxis=0; iaxis<kNumberOfAxes;iaxis++){
895 histTpcLength->GetAxis(iaxis)->SetName(axisNameTpcLength[iaxis]);
896 histTpcLength->GetAxis(iaxis)->SetTitle(axisTitleTpcLength[iaxis]);
899 // (9.) match TPC->ITS
900 // 0-is matched, 1-pt, 2-eta, 3-phi, 4-pid(0-3 -> electron-proton, 4 -> undef, 5 -> all)
901 Int_t binsTpcItsMatch[kNumberOfAxes] = { 2, 50, 20, 18, 6};
902 Double_t minTpcItsMatch[kNumberOfAxes] = { -0.5, 0.1, -1, 0, -0.5};
903 Double_t maxTpcItsMatch[kNumberOfAxes] = { 1.5, 20, +1, 2*TMath::Pi(), 5.5};
905 TString axisNameTpcItsMatch[kNumberOfAxes] = {"isMatched","pT","eta","phi","pid"};
906 TString axisTitleTpcItsMatch[kNumberOfAxes] = {"isMatched","pT","eta","phi","pid"};
908 THnF * histTpcItsMatch = new THnF("histTpcItsMatch","TPC -> ITS matching",kNumberOfAxes, binsTpcItsMatch, minTpcItsMatch, maxTpcItsMatch);
909 BinLogAxis(histTpcItsMatch, 1);
910 fListHist->Add(histTpcItsMatch);
912 for (Int_t iaxis=0; iaxis<kNumberOfAxes;iaxis++){
913 histTpcItsMatch->GetAxis(iaxis)->SetName(axisNameTpcItsMatch[iaxis]);
914 histTpcItsMatch->GetAxis(iaxis)->SetTitle(axisTitleTpcItsMatch[iaxis]);