1 /**************************************************************************
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4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
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14 **************************************************************************/
17 // Implements the abstract base class AliHFEpidbase
18 // Make PID does the PID decision
19 // Class further contains TRD specific cuts and QA histograms
22 // Markus Fasel <M.Fasel@gsi.de>
26 #include <THnSparse.h>
30 #include "AliAODPid.h"
31 #include "AliAODTrack.h"
32 #include "AliAODMCParticle.h"
33 #include "AliESDtrack.h"
35 #include "AliMCParticle.h"
36 #include "AliOADBContainer.h"
38 #include "AliPIDResponse.h"
40 #include "AliHFEOADBThresholdsTRD.h"
41 #include "AliHFEpidQAmanager.h"
42 #include "AliHFEpidTRD.h"
44 ClassImp(AliHFEpidTRD)
46 //___________________________________________________________________
47 AliHFEpidTRD::AliHFEpidTRD() :
49 , fOADBThresholds(NULL)
54 , fElectronEfficiency(0.90)
55 , fTotalChargeInSlice0(kFALSE)
56 , fTRDOldPIDMethod(kFALSE)
60 // default constructor
62 memset(fThreshParams, 0, sizeof(Double_t) * kThreshParams);
65 //___________________________________________________________________
66 AliHFEpidTRD::AliHFEpidTRD(const char* name) :
68 , fOADBThresholds(NULL)
73 , fElectronEfficiency(0.91)
74 , fTotalChargeInSlice0(kFALSE)
75 , fTRDOldPIDMethod(kFALSE)
79 // default constructor
81 memset(fThreshParams, 0, sizeof(Double_t) * kThreshParams);
84 //___________________________________________________________________
85 AliHFEpidTRD::AliHFEpidTRD(const AliHFEpidTRD &ref):
87 , fOADBThresholds(NULL)
89 , fNTracklets(ref.fNTracklets)
90 , fCutNTracklets(ref.fCutNTracklets)
91 , fRunNumber(ref.fRunNumber)
92 , fElectronEfficiency(ref.fElectronEfficiency)
93 , fTotalChargeInSlice0(ref.fTotalChargeInSlice0)
94 , fTRDOldPIDMethod(ref.fTRDOldPIDMethod)
95 , fTRD2DPID(ref.fTRD2DPID)
100 memset(fThreshParams, 0, sizeof(Double_t) * kThreshParams);
104 //___________________________________________________________________
105 AliHFEpidTRD &AliHFEpidTRD::operator=(const AliHFEpidTRD &ref){
107 // Assignment operator
115 //___________________________________________________________________
116 void AliHFEpidTRD::Copy(TObject &ref) const {
118 // Performs the copying of the object
120 AliHFEpidTRD &target = dynamic_cast<AliHFEpidTRD &>(ref);
122 target.fMinP = fMinP;
123 target.fNTracklets = fNTracklets;
124 target.fCutNTracklets = fCutNTracklets;
125 target.fRunNumber = fRunNumber;
126 target.fTotalChargeInSlice0 = fTotalChargeInSlice0;
127 target.fTRDOldPIDMethod = fTRDOldPIDMethod;
128 target.fTRD2DPID = fTRD2DPID;
129 target.fElectronEfficiency = fElectronEfficiency;
130 memcpy(target.fThreshParams, fThreshParams, sizeof(Double_t) * kThreshParams);
131 AliHFEpidBase::Copy(ref);
134 //___________________________________________________________________
135 AliHFEpidTRD::~AliHFEpidTRD(){
141 //______________________________________________________
142 Bool_t AliHFEpidTRD::InitializePID(Int_t run){
144 // InitializePID call different init function depending on TRD PID method
148 if(fTRDOldPIDMethod) return Initialize1D(run);
154 //______________________________________________________
155 Bool_t AliHFEpidTRD::Initialize1D(Int_t run){
157 // InitializePID: Load TRD thresholds and create the electron efficiency axis
160 AliDebug(1, Form("Initializing TRD PID for run %d", run));
161 if(InitParamsFromOADB(run)){
162 SetBit(kThresholdsInitialized);
165 AliDebug(1, Form("Threshold Parameters for %d tracklets and an electron efficiency %f loaded:", fNTracklets, fElectronEfficiency));
166 AliDebug(1, Form("Params: [%f|%f|%f|%f]", fThreshParams[0], fThreshParams[1], fThreshParams[2], fThreshParams[3]));
172 //______________________________________________________
173 Bool_t AliHFEpidTRD::Initialize2D(Int_t run){
184 //______________________________________________________
185 Int_t AliHFEpidTRD::IsSelected(const AliHFEpidObject *track, AliHFEpidQAmanager *pidqa) const {
187 // Does PID for TRD alone:
188 // PID algorithm selected according to flag
192 if(fTRDOldPIDMethod) return IsSelected1D(track, pidqa);
193 else return IsSelectedTRDPID(track, pidqa);
196 //______________________________________________________
197 Int_t AliHFEpidTRD::IsSelected1D(const AliHFEpidObject *track, AliHFEpidQAmanager *pidqa) const {
199 // Does PID for TRD alone:
200 // PID thresholds based on 90% Electron Efficiency level approximated by a linear
203 if(!TestBit(kThresholdsInitialized)) {
204 AliDebug(1,"Threshold Parameters not available");
207 AliDebug(2, "Applying TRD PID");
209 AliDebug(2, "Cannot process track");
215 const AliESDtrack *esdt = dynamic_cast<const AliESDtrack *>(track->GetRecTrack());
216 printf("checking IdentifiedAsElectronTRD, number of Tracklets: %d\n", esdt->GetTRDntrackletsPID());
217 if(fkPIDResponse->IdentifiedAsElectronTRD(dynamic_cast<const AliVTrack *>(track->GetRecTrack()), 0.8)) printf("Track identified as electron\n");
218 else printf("Track rejected\n");
220 AliHFEpidObject::AnalysisType_t anatype = track->IsESDanalysis() ? AliHFEpidObject::kESDanalysis: AliHFEpidObject::kAODanalysis;
221 Double_t p = GetP(track->GetRecTrack(), anatype);
223 AliDebug(2, Form("Track momentum below %f", fMinP));
227 if(pidqa) pidqa->ProcessTrack(track, AliHFEpid::kTRDpid, AliHFEdetPIDqa::kBeforePID);
229 if(fCutNTracklets > 0){
230 AliDebug(1, Form("Number of tracklets cut applied: %d\n", fCutNTracklets));
231 Int_t ntracklets = track->GetRecTrack() ? track->GetRecTrack()->GetTRDntrackletsPID() : 0;
232 if(TestBit(kExactTrackletCut)){
233 AliDebug(1, Form("Exact cut applied: %d tracklets found\n", ntracklets));
234 if(ntracklets != fCutNTracklets) return 0;
236 AliDebug(1, Form("Greater Equal cut applied: %d tracklets found\n", ntracklets));
237 if(ntracklets < fCutNTracklets) return 0;
240 AliDebug(1,"Track selected\n");
242 Double_t electronLike = GetElectronLikelihood(track->GetRecTrack(), anatype);
244 if(TestBit(kSelectCutOnTheFly)){
245 threshold = GetTRDthresholds(p, track->GetRecTrack()->GetTRDntrackletsPID());
247 threshold = GetTRDthresholds(p);
249 AliDebug(2, Form("Threshold: %f\n", threshold));
250 if(electronLike > threshold){
251 if(pidqa) pidqa->ProcessTrack(track, AliHFEpid::kTRDpid, AliHFEdetPIDqa::kAfterPID);
258 //______________________________________________________
259 Int_t AliHFEpidTRD::IsSelectedTRDPID(const AliHFEpidObject *track, AliHFEpidQAmanager *pidqa) const {
265 AliDebug(2, "Applying TRD PID");
267 AliDebug(2, "Cannot process track");
271 AliHFEpidObject::AnalysisType_t anatype = track->IsESDanalysis() ? AliHFEpidObject::kESDanalysis: AliHFEpidObject::kAODanalysis;
272 Double_t p = GetP(track->GetRecTrack(), anatype);
274 AliDebug(2, Form("Track momentum below %f", fMinP));
278 if(pidqa) pidqa->ProcessTrack(track, AliHFEpid::kTRDpid, AliHFEdetPIDqa::kBeforePID);
280 if(fCutNTracklets > 0){
281 AliDebug(1, Form("Number of tracklets cut applied: %d\n", fCutNTracklets));
282 Int_t ntracklets = track->GetRecTrack() ? track->GetRecTrack()->GetTRDntrackletsPID() : 0;
283 if(TestBit(kExactTrackletCut)){
284 AliDebug(1, Form("Exact cut applied: %d tracklets found\n", ntracklets));
285 if(ntracklets != fCutNTracklets) return 0;
287 AliDebug(1, Form("Greater Equal cut applied: %d tracklets found\n", ntracklets));
288 if(ntracklets < fCutNTracklets) return 0;
291 AliDebug(1,"Track selected\n");
293 Int_t centralitybin = track->IsPbPb() ? track->GetCentrality() : -2;
294 Float_t fCentralityLimitsdefault[12]= {0.,5.,10., 20., 30., 40., 50., 60.,70.,80., 90., 100.};
295 Float_t centrality=-1;
296 if(centralitybin>=0) centrality=fCentralityLimitsdefault[centralitybin]+1;
298 AliTRDPIDResponse::ETRDPIDMethod fTRDPIDMethod = AliTRDPIDResponse::kLQ1D;
299 if(fTRD2DPID) fTRDPIDMethod = AliTRDPIDResponse::kLQ2D;
301 // printf("TRD PID Method in use: %i \n",fTRDPIDMethod);
302 // if(fkPIDResponse->IdentifiedAsElectronTRD(track->GetRecTrack(),fElectronEfficiency,centrality,fTRDPIDMethod)){
303 Int_t ntrackletsPID=0;
304 Bool_t iselectron=kFALSE;
305 iselectron=fkPIDResponse->IdentifiedAsElectronTRD(track->GetRecTrack(),ntrackletsPID,fElectronEfficiency,centrality,fTRDPIDMethod);
306 if((ntrackletsPID==fCutNTracklets) && iselectron){
307 AliDebug(2, Form("Electron effi: %f %i %i %f %i\n", fElectronEfficiency,track->GetCentrality(),centralitybin,centrality,fTRDPIDMethod));
308 if(pidqa) pidqa->ProcessTrack(track, AliHFEpid::kTRDpid, AliHFEdetPIDqa::kAfterPID);
316 //___________________________________________________________________
317 Double_t AliHFEpidTRD::GetTRDthresholds(Double_t p, UInt_t nTracklets) const {
319 // Return momentum dependent and electron efficiency dependent TRD thresholds
320 // Determine threshold based on the number of tracklets on the fly, electron efficiency not modified
322 Double_t threshParams[4];
323 AliDebug(1, Form("Select cut for %d tracklets\n", nTracklets));
324 // Get threshold paramters for the given number of tracklets from OADB container
325 AliHFEOADBThresholdsTRD *thresholds = dynamic_cast<AliHFEOADBThresholdsTRD *>(fOADBThresholds->GetObject(fRunNumber));
327 AliDebug(1, Form("Thresholds for run %d not in the OADB", fRunNumber));
330 if(!thresholds->GetThresholdParameters(nTracklets, fElectronEfficiency, threshParams)){
331 AliDebug(1, "loading thresholds failed\n");
334 Double_t threshold = 1. - threshParams[0] - threshParams[1] * p - threshParams[2] * TMath::Exp(-threshParams[3] * p);
335 return TMath::Max(TMath::Min(threshold, 0.99), 0.2); // truncate the threshold upperwards to 0.999 and lowerwards to 0.2 and exclude unphysical values
338 //___________________________________________________________________
339 Double_t AliHFEpidTRD::GetTRDthresholds(Double_t p) const {
341 // Return momentum dependent and electron efficiency dependent TRD thresholds
343 Double_t threshold = 1. - fThreshParams[0] - fThreshParams[1] * p - fThreshParams[2] * TMath::Exp(-fThreshParams[3] * p);
344 return TMath::Max(TMath::Min(threshold, 0.99), 0.2); // truncate the threshold upperwards to 0.999 and lowerwards to 0.2 and exclude unphysical values
348 //___________________________________________________________________
349 Bool_t AliHFEpidTRD::InitParamsFromOADB(Int_t run){
351 // The name of the function says it all
353 AliHFEOADBThresholdsTRD *thresholds = dynamic_cast<AliHFEOADBThresholdsTRD *>(fOADBThresholds->GetObject(run));
355 AliDebug(1, Form("Thresholds for run %d not in the OADB", run));
358 return thresholds->GetThresholdParameters(fNTracklets, fElectronEfficiency, fThreshParams);
361 //___________________________________________________________________
362 void AliHFEpidTRD::RenormalizeElPi(const Double_t * const likein, Double_t * const likeout) const {
364 // Renormalize likelihoods for electrons and pions neglecting the
365 // likelihoods for protons, kaons and muons
367 memset(likeout, 0, sizeof(Double_t) * AliPID::kSPECIES);
368 Double_t norm = likein[AliPID::kElectron] + likein[AliPID::kPion];
369 if(norm == 0.) norm = 1.; // Safety
370 likeout[AliPID::kElectron] = likein[AliPID::kElectron] / norm;
371 likeout[AliPID::kPion] = likein[AliPID::kPion] / norm;
374 //___________________________________________________________________
375 Double_t AliHFEpidTRD::GetElectronLikelihood(const AliVTrack *track, AliHFEpidObject::AnalysisType_t anaType) const {
377 // Get TRD likelihoods for ESD respectively AOD tracks
379 Double_t pidProbs[AliPID::kSPECIES]; memset(pidProbs, 0, sizeof(Double_t) * AliPID::kSPECIES);
380 if(anaType == AliHFEpidObject::kESDanalysis){
381 const AliESDtrack *esdtrack = dynamic_cast<const AliESDtrack *>(track);
382 if(esdtrack) esdtrack->GetTRDpid(pidProbs);
384 if(fTRD2DPID) fkPIDResponse->ComputeTRDProbability(track, AliPID::kSPECIES, pidProbs,AliTRDPIDResponse::kLQ2D);
385 else fkPIDResponse->ComputeTRDProbability(track, AliPID::kSPECIES, pidProbs,AliTRDPIDResponse::kLQ1D);
387 if(!IsRenormalizeElPi()) return pidProbs[AliPID::kElectron];
388 Double_t probsNew[AliPID::kSPECIES];
389 RenormalizeElPi(pidProbs, probsNew);
390 return probsNew[AliPID::kElectron];
393 //___________________________________________________________________
394 Double_t AliHFEpidTRD::GetP(const AliVParticle *track, AliHFEpidObject::AnalysisType_t anaType) const {
396 // Get the Momentum in the TRD
399 if(anaType == AliHFEpidObject::kESDanalysis){
400 const AliESDtrack *esdtrack = dynamic_cast<const AliESDtrack *>(track);
401 if(esdtrack) p = esdtrack->GetOuterParam() ? esdtrack->GetOuterParam()->P() : esdtrack->P();
403 const AliAODTrack *aodtrack = dynamic_cast<const AliAODTrack *>(track);
404 if(aodtrack) p = aodtrack->P();
409 //___________________________________________________________________
410 Double_t AliHFEpidTRD::GetChargeLayer(const AliVParticle *track, UInt_t layer, AliHFEpidObject::AnalysisType_t anaType) const {
412 // Get the Charge in a single TRD layer
414 if(layer >= 6) return 0.;
415 Double_t charge = 0.;
416 if(anaType == AliHFEpidObject::kESDanalysis){
417 const AliESDtrack *esdtrack = dynamic_cast<const AliESDtrack *>(track);
419 // Distinction between old and new reconstruction: in the new reconstruction, the total charge is stored in slice 0, slices 1 to 8 are used for the slices for
420 // the neural network.
421 if(fTotalChargeInSlice0)
422 charge = esdtrack->GetTRDslice(static_cast<UInt_t>(layer), 0);
424 for(Int_t islice = 0; islice < esdtrack->GetNumberOfTRDslices(); islice++) charge += esdtrack->GetTRDslice(static_cast<UInt_t>(layer), islice);
427 const AliAODTrack *aodtrack = dynamic_cast<const AliAODTrack *>(track);
428 AliAODPid *aoddetpid = aodtrack ? aodtrack->GetDetPid() : NULL;
430 if(fTotalChargeInSlice0)
431 charge = aoddetpid->GetTRDslices()[layer * aoddetpid->GetTRDnSlices()];
433 for(Int_t islice = 0; islice < aoddetpid->GetTRDnSlices(); islice++) charge += aoddetpid->GetTRDslices()[layer * aoddetpid->GetTRDnSlices() + islice];
439 //___________________________________________________________________
440 void AliHFEpidTRD::GetTRDmomenta(const AliVTrack *track, Double_t *mom) const {
442 // Fill Array with momentum information at the TRD tracklet
444 for(Int_t itl = 0; itl < 6; itl++)
445 mom[itl] = track->GetTRDmomentum(itl);
448 //___________________________________________________________________
449 Double_t AliHFEpidTRD::GetTRDSignalV1(const AliESDtrack *track, Float_t truncation) const {
451 // Calculation of the TRD Signal via truncated mean
452 // Method 1: Take all Slices available
454 // Order them in increasing order
455 // Cut out the upper third
456 // Calculate mean over the last 2/3 slices
458 const Int_t kNSlices = 48;
459 const Int_t kLastSlice = 6; // Slice 7 is taken out from the truncated mean calculation
460 const Double_t kVerySmall = 1e-12;
461 // Weight the slice to equalize the MPV of the dQ/dl-distribution per slice to the one in the first slice
462 // Pions are used as reference for the equalization
463 const Double_t kWeightSlice[8] = {1., 2.122, 1.8, 1.635, 1.595, 1.614, 1.16, 7.0};
464 const Double_t kWeightSliceNo0[8] = {1., 1., 1.271, 1.451, 1.531, 1.543, 1.553, 2.163}; // Weighting factors in case slice 0 stores the total charge
465 const Double_t *kWeightFactor = fTotalChargeInSlice0 ? kWeightSliceNo0 : kWeightSlice;
466 AliDebug(3, Form("Number of Tracklets: %d\n", track->GetTRDntrackletsPID()));
467 Double_t trdSlices[kNSlices], tmp[kNSlices];
470 for(Int_t idet = 0; idet < 6; idet++)
471 for(Int_t islice = fTotalChargeInSlice0 ? 1 : 0 ; islice <= kLastSlice; islice++){
472 AliDebug(2, Form("Chamber[%d], Slice[%d]: TRDSlice = %f", idet, islice, track->GetTRDslice(idet, islice)));
473 if(TMath::Abs(track->GetTRDslice(idet, islice)) < kVerySmall) continue;;
474 trdSlices[icnt++] = track->GetTRDslice(idet, islice) * kWeightFactor[islice];
476 AliDebug(1, Form("Number of Slices: %d\n", icnt));
477 if(icnt < 6) return 0.; // We need at least 6 Slices for the truncated mean
478 TMath::Sort(icnt, trdSlices, indices, kFALSE);
479 memcpy(tmp, trdSlices, sizeof(Double_t) * icnt);
480 for(Int_t ien = 0; ien < icnt; ien++)
481 trdSlices[ien] = tmp[indices[ien]];
482 Double_t trdSignal = TMath::Mean(static_cast<Int_t>(static_cast<Float_t>(icnt) * truncation), trdSlices);
483 Double_t mom = track->GetOuterParam() ? track->GetOuterParam()->P() : -1;
484 AliDebug(3, Form("PID Meth. 1: p[%f], TRDSignal[%f]", mom, trdSignal));
488 //___________________________________________________________________
489 Double_t AliHFEpidTRD::GetTRDSignalV2(const AliESDtrack *track, Float_t truncation) const {
491 // Calculation of the TRD Signal via truncated mean
492 // Method 2: Take only first 5 slices per chamber
493 // Order them in increasing order
494 // Cut out upper half
495 // Now do mean with the reamining 3 slices per chamber
497 const Double_t kWeightSlice[8] = {1., 2.122, 1.8, 1.635, 1.595, 1.614, 1.16, 7.0};
498 const Int_t kLayers = 6;
499 const Int_t kSlicesLow = 6;
500 const Int_t kSlicesHigh = 1;
501 const Double_t kVerySmall = 1e-12;
502 Double_t trdSlicesLowTime[kLayers*kSlicesLow], trdSlicesRemaining[kLayers*(kSlicesHigh + kSlicesLow)];
503 Int_t indices[kLayers*kSlicesLow];
504 Int_t cntLowTime=0, cntRemaining = 0;
505 for(Int_t idet = 0; idet < 6; idet++)
506 for(Int_t islice = fTotalChargeInSlice0 ? 1 : 0; islice < kSlicesLow+kSlicesHigh; islice++){
507 if(TMath::Abs(track->GetTRDslice(idet, islice)) < kVerySmall) continue;;
508 if(islice < kSlicesLow){
509 AliDebug(3, Form("Part 1, Det[%d], Slice[%d], TRDSlice: %f", idet, islice, track->GetTRDslice(idet, islice)));
510 trdSlicesLowTime[cntLowTime++] = track->GetTRDslice(idet, islice) * kWeightSlice[islice];
512 AliDebug(3, Form("Part 1, Det[%d], Slice[%d], TRDSlice: %f", idet, islice, track->GetTRDslice(idet, islice)));
513 trdSlicesRemaining[cntRemaining++] = track->GetTRDslice(idet, islice) * kWeightSlice[islice];
516 if(cntLowTime < 4 || cntRemaining < 2) return 0.; // Min. Number of Slices at high time is 2 (matches with 1 layer), for the truncated mean we need at least 4 Slices
517 TMath::Sort(cntLowTime, trdSlicesLowTime, indices, kFALSE);
518 // Fill the second array with the lower half of the first time bins
519 for(Int_t ien = 0; ien < static_cast<Int_t>(static_cast<Float_t>(cntLowTime) * truncation); ien++)
520 trdSlicesRemaining[cntRemaining++] = trdSlicesLowTime[indices[ien]];
521 Double_t trdSignal = TMath::Mean(cntRemaining, trdSlicesRemaining);
522 Double_t mom = track->GetOuterParam() ? track->GetOuterParam()->P() : -1;
523 AliDebug(3, Form("PID Meth. 2: p[%f], TRDSignal[%f]", mom, trdSignal));