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. *
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12 * about the suitability of this software for any purpose. It is *
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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)
58 // default constructor
60 memset(fThreshParams, 0, sizeof(Double_t) * kThreshParams);
63 //___________________________________________________________________
64 AliHFEpidTRD::AliHFEpidTRD(const char* name) :
66 , fOADBThresholds(NULL)
71 , fElectronEfficiency(0.91)
72 , fTotalChargeInSlice0(kFALSE)
75 // default constructor
77 memset(fThreshParams, 0, sizeof(Double_t) * kThreshParams);
80 //___________________________________________________________________
81 AliHFEpidTRD::AliHFEpidTRD(const AliHFEpidTRD &ref):
83 , fOADBThresholds(NULL)
85 , fNTracklets(ref.fNTracklets)
86 , fCutNTracklets(ref.fCutNTracklets)
87 , fRunNumber(ref.fRunNumber)
88 , fElectronEfficiency(ref.fElectronEfficiency)
89 , fTotalChargeInSlice0(ref.fTotalChargeInSlice0)
94 memset(fThreshParams, 0, sizeof(Double_t) * kThreshParams);
98 //___________________________________________________________________
99 AliHFEpidTRD &AliHFEpidTRD::operator=(const AliHFEpidTRD &ref){
101 // Assignment operator
109 //___________________________________________________________________
110 void AliHFEpidTRD::Copy(TObject &ref) const {
112 // Performs the copying of the object
114 AliHFEpidTRD &target = dynamic_cast<AliHFEpidTRD &>(ref);
116 target.fMinP = fMinP;
117 target.fNTracklets = fNTracklets;
118 target.fCutNTracklets = fCutNTracklets;
119 target.fRunNumber = fRunNumber;
120 target.fTotalChargeInSlice0 = fTotalChargeInSlice0;
121 target.fElectronEfficiency = fElectronEfficiency;
122 memcpy(target.fThreshParams, fThreshParams, sizeof(Double_t) * kThreshParams);
123 AliHFEpidBase::Copy(ref);
126 //___________________________________________________________________
127 AliHFEpidTRD::~AliHFEpidTRD(){
133 //______________________________________________________
134 Bool_t AliHFEpidTRD::InitializePID(Int_t run){
136 // InitializePID: Load TRD thresholds and create the electron efficiency axis
139 AliDebug(1, Form("Initializing TRD PID for run %d", run));
140 if(InitParamsFromOADB(run)){
141 SetBit(kThresholdsInitialized);
144 AliDebug(1, Form("Threshold Parameters for %d tracklets and an electron efficiency %f loaded:", fNTracklets, fElectronEfficiency));
145 AliDebug(1, Form("Params: [%f|%f|%f|%f]", fThreshParams[0], fThreshParams[1], fThreshParams[2], fThreshParams[3]));
150 //______________________________________________________
151 Int_t AliHFEpidTRD::IsSelected(const AliHFEpidObject *track, AliHFEpidQAmanager *pidqa) const {
153 // Does PID for TRD alone:
154 // PID thresholds based on 90% Electron Efficiency level approximated by a linear
157 if(!TestBit(kThresholdsInitialized)) {
158 AliDebug(1,"Threshold Parameters not available");
161 AliDebug(2, "Applying TRD PID");
163 AliDebug(2, "Cannot process track");
169 const AliESDtrack *esdt = dynamic_cast<const AliESDtrack *>(track->GetRecTrack());
170 printf("checking IdentifiedAsElectronTRD, number of Tracklets: %d\n", esdt->GetTRDntrackletsPID());
171 if(fkPIDResponse->IdentifiedAsElectronTRD(dynamic_cast<const AliVTrack *>(track->GetRecTrack()), 0.8)) printf("Track identified as electron\n");
172 else printf("Track rejected\n");
174 AliHFEpidObject::AnalysisType_t anatype = track->IsESDanalysis() ? AliHFEpidObject::kESDanalysis: AliHFEpidObject::kAODanalysis;
175 Double_t p = GetP(track->GetRecTrack(), anatype);
177 AliDebug(2, Form("Track momentum below %f", fMinP));
181 if(pidqa) pidqa->ProcessTrack(track, AliHFEpid::kTRDpid, AliHFEdetPIDqa::kBeforePID);
183 if(fCutNTracklets > 0){
184 AliDebug(1, Form("Number of tracklets cut applied: %d\n", fCutNTracklets));
185 Int_t ntracklets = track->GetRecTrack() ? track->GetRecTrack()->GetTRDntrackletsPID() : 0;
186 if(TestBit(kExactTrackletCut)){
187 AliDebug(1, Form("Exact cut applied: %d tracklets found\n", ntracklets));
188 if(ntracklets != fCutNTracklets) return 0;
190 AliDebug(1, Form("Greater Equal cut applied: %d tracklets found\n", ntracklets));
191 if(ntracklets < fCutNTracklets) return 0;
194 AliDebug(1,"Track selected\n");
196 Double_t electronLike = GetElectronLikelihood(track->GetRecTrack(), anatype);
198 if(TestBit(kSelectCutOnTheFly)){
199 threshold = GetTRDthresholds(p, track->GetRecTrack()->GetTRDntrackletsPID());
201 threshold = GetTRDthresholds(p);
203 AliDebug(2, Form("Threshold: %f\n", threshold));
204 if(electronLike > threshold){
205 if(pidqa) pidqa->ProcessTrack(track, AliHFEpid::kTRDpid, AliHFEdetPIDqa::kAfterPID);
212 //___________________________________________________________________
213 Double_t AliHFEpidTRD::GetTRDthresholds(Double_t p, UInt_t nTracklets) const {
215 // Return momentum dependent and electron efficiency dependent TRD thresholds
216 // Determine threshold based on the number of tracklets on the fly, electron efficiency not modified
218 Double_t threshParams[4];
219 AliDebug(1, Form("Select cut for %d tracklets\n", nTracklets));
220 // Get threshold paramters for the given number of tracklets from OADB container
221 AliHFEOADBThresholdsTRD *thresholds = dynamic_cast<AliHFEOADBThresholdsTRD *>(fOADBThresholds->GetObject(fRunNumber));
223 AliDebug(1, Form("Thresholds for run %d not in the OADB", fRunNumber));
226 if(!thresholds->GetThresholdParameters(nTracklets, fElectronEfficiency, threshParams)){
227 AliDebug(1, "loading thresholds failed\n");
230 Double_t threshold = 1. - threshParams[0] - threshParams[1] * p - threshParams[2] * TMath::Exp(-threshParams[3] * p);
231 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
234 //___________________________________________________________________
235 Double_t AliHFEpidTRD::GetTRDthresholds(Double_t p) const {
237 // Return momentum dependent and electron efficiency dependent TRD thresholds
239 Double_t threshold = 1. - fThreshParams[0] - fThreshParams[1] * p - fThreshParams[2] * TMath::Exp(-fThreshParams[3] * p);
240 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
244 //___________________________________________________________________
245 Bool_t AliHFEpidTRD::InitParamsFromOADB(Int_t run){
247 // The name of the function says it all
249 AliHFEOADBThresholdsTRD *thresholds = dynamic_cast<AliHFEOADBThresholdsTRD *>(fOADBThresholds->GetObject(run));
251 AliDebug(1, Form("Thresholds for run %d not in the OADB", run));
254 return thresholds->GetThresholdParameters(fNTracklets, fElectronEfficiency, fThreshParams);
257 //___________________________________________________________________
258 void AliHFEpidTRD::RenormalizeElPi(const Double_t * const likein, Double_t * const likeout) const {
260 // Renormalize likelihoods for electrons and pions neglecting the
261 // likelihoods for protons, kaons and muons
263 memset(likeout, 0, sizeof(Double_t) * AliPID::kSPECIES);
264 Double_t norm = likein[AliPID::kElectron] + likein[AliPID::kPion];
265 if(norm == 0.) norm = 1.; // Safety
266 likeout[AliPID::kElectron] = likein[AliPID::kElectron] / norm;
267 likeout[AliPID::kPion] = likein[AliPID::kPion] / norm;
270 //___________________________________________________________________
271 Double_t AliHFEpidTRD::GetElectronLikelihood(const AliVTrack *track, AliHFEpidObject::AnalysisType_t anaType) const {
273 // Get TRD likelihoods for ESD respectively AOD tracks
275 Double_t pidProbs[AliPID::kSPECIES]; memset(pidProbs, 0, sizeof(Double_t) * AliPID::kSPECIES);
276 if(anaType == AliHFEpidObject::kESDanalysis){
277 const AliESDtrack *esdtrack = dynamic_cast<const AliESDtrack *>(track);
278 if(esdtrack) esdtrack->GetTRDpid(pidProbs);
280 fkPIDResponse->ComputeTRDProbability(track, AliPID::kSPECIES, pidProbs);
282 if(!IsRenormalizeElPi()) return pidProbs[AliPID::kElectron];
283 Double_t probsNew[AliPID::kSPECIES];
284 RenormalizeElPi(pidProbs, probsNew);
285 return probsNew[AliPID::kElectron];
288 //___________________________________________________________________
289 Double_t AliHFEpidTRD::GetP(const AliVParticle *track, AliHFEpidObject::AnalysisType_t anaType) const {
291 // Get the Momentum in the TRD
294 if(anaType == AliHFEpidObject::kESDanalysis){
295 const AliESDtrack *esdtrack = dynamic_cast<const AliESDtrack *>(track);
296 if(esdtrack) p = esdtrack->GetOuterParam() ? esdtrack->GetOuterParam()->P() : esdtrack->P();
298 const AliAODTrack *aodtrack = dynamic_cast<const AliAODTrack *>(track);
299 if(aodtrack) p = aodtrack->P();
304 //___________________________________________________________________
305 Double_t AliHFEpidTRD::GetChargeLayer(const AliVParticle *track, UInt_t layer, AliHFEpidObject::AnalysisType_t anaType) const {
307 // Get the Charge in a single TRD layer
309 if(layer >= 6) return 0.;
310 Double_t charge = 0.;
311 if(anaType == AliHFEpidObject::kESDanalysis){
312 const AliESDtrack *esdtrack = dynamic_cast<const AliESDtrack *>(track);
314 // 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
315 // the neural network.
316 if(fTotalChargeInSlice0)
317 charge = esdtrack->GetTRDslice(static_cast<UInt_t>(layer), 0);
319 for(Int_t islice = 0; islice < esdtrack->GetNumberOfTRDslices(); islice++) charge += esdtrack->GetTRDslice(static_cast<UInt_t>(layer), islice);
322 const AliAODTrack *aodtrack = dynamic_cast<const AliAODTrack *>(track);
323 AliAODPid *aoddetpid = aodtrack ? aodtrack->GetDetPid() : NULL;
325 if(fTotalChargeInSlice0)
326 charge = aoddetpid->GetTRDsignal()[layer * aoddetpid->GetTRDnSlices()];
328 for(Int_t islice = 0; islice < aoddetpid->GetTRDnSlices(); islice++) charge += aoddetpid->GetTRDsignal()[layer * aoddetpid->GetTRDnSlices() + islice];
334 //___________________________________________________________________
335 void AliHFEpidTRD::GetTRDmomenta(const AliVTrack *track, Double_t *mom) const {
337 // Fill Array with momentum information at the TRD tracklet
339 for(Int_t itl = 0; itl < 6; itl++)
340 mom[itl] = track->GetTRDmomentum(itl);
343 //___________________________________________________________________
344 Double_t AliHFEpidTRD::GetTRDSignalV1(const AliESDtrack *track, Float_t truncation) const {
346 // Calculation of the TRD Signal via truncated mean
347 // Method 1: Take all Slices available
349 // Order them in increasing order
350 // Cut out the upper third
351 // Calculate mean over the last 2/3 slices
353 const Int_t kNSlices = 48;
354 const Int_t kLastSlice = 6; // Slice 7 is taken out from the truncated mean calculation
355 const Double_t kVerySmall = 1e-12;
356 // Weight the slice to equalize the MPV of the dQ/dl-distribution per slice to the one in the first slice
357 // Pions are used as reference for the equalization
358 const Double_t kWeightSlice[8] = {1., 2.122, 1.8, 1.635, 1.595, 1.614, 1.16, 7.0};
359 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
360 const Double_t *kWeightFactor = fTotalChargeInSlice0 ? kWeightSliceNo0 : kWeightSlice;
361 AliDebug(3, Form("Number of Tracklets: %d\n", track->GetTRDntrackletsPID()));
362 Double_t trdSlices[kNSlices], tmp[kNSlices];
365 for(Int_t idet = 0; idet < 6; idet++)
366 for(Int_t islice = fTotalChargeInSlice0 ? 1 : 0 ; islice <= kLastSlice; islice++){
367 AliDebug(2, Form("Chamber[%d], Slice[%d]: TRDSlice = %f", idet, islice, track->GetTRDslice(idet, islice)));
368 if(TMath::Abs(track->GetTRDslice(idet, islice)) < kVerySmall) continue;;
369 trdSlices[icnt++] = track->GetTRDslice(idet, islice) * kWeightFactor[islice];
371 AliDebug(1, Form("Number of Slices: %d\n", icnt));
372 if(icnt < 6) return 0.; // We need at least 6 Slices for the truncated mean
373 TMath::Sort(icnt, trdSlices, indices, kFALSE);
374 memcpy(tmp, trdSlices, sizeof(Double_t) * icnt);
375 for(Int_t ien = 0; ien < icnt; ien++)
376 trdSlices[ien] = tmp[indices[ien]];
377 Double_t trdSignal = TMath::Mean(static_cast<Int_t>(static_cast<Float_t>(icnt) * truncation), trdSlices);
378 Double_t mom = track->GetOuterParam() ? track->GetOuterParam()->P() : -1;
379 AliDebug(3, Form("PID Meth. 1: p[%f], TRDSignal[%f]", mom, trdSignal));
383 //___________________________________________________________________
384 Double_t AliHFEpidTRD::GetTRDSignalV2(const AliESDtrack *track, Float_t truncation) const {
386 // Calculation of the TRD Signal via truncated mean
387 // Method 2: Take only first 5 slices per chamber
388 // Order them in increasing order
389 // Cut out upper half
390 // Now do mean with the reamining 3 slices per chamber
392 const Double_t kWeightSlice[8] = {1., 2.122, 1.8, 1.635, 1.595, 1.614, 1.16, 7.0};
393 const Int_t kLayers = 6;
394 const Int_t kSlicesLow = 6;
395 const Int_t kSlicesHigh = 1;
396 const Double_t kVerySmall = 1e-12;
397 Double_t trdSlicesLowTime[kLayers*kSlicesLow], trdSlicesRemaining[kLayers*(kSlicesHigh + kSlicesLow)];
398 Int_t indices[kLayers*kSlicesLow];
399 Int_t cntLowTime=0, cntRemaining = 0;
400 for(Int_t idet = 0; idet < 6; idet++)
401 for(Int_t islice = fTotalChargeInSlice0 ? 1 : 0; islice < kSlicesLow+kSlicesHigh; islice++){
402 if(TMath::Abs(track->GetTRDslice(idet, islice)) < kVerySmall) continue;;
403 if(islice < kSlicesLow){
404 AliDebug(3, Form("Part 1, Det[%d], Slice[%d], TRDSlice: %f", idet, islice, track->GetTRDslice(idet, islice)));
405 trdSlicesLowTime[cntLowTime++] = track->GetTRDslice(idet, islice) * kWeightSlice[islice];
407 AliDebug(3, Form("Part 1, Det[%d], Slice[%d], TRDSlice: %f", idet, islice, track->GetTRDslice(idet, islice)));
408 trdSlicesRemaining[cntRemaining++] = track->GetTRDslice(idet, islice) * kWeightSlice[islice];
411 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
412 TMath::Sort(cntLowTime, trdSlicesLowTime, indices, kFALSE);
413 // Fill the second array with the lower half of the first time bins
414 for(Int_t ien = 0; ien < static_cast<Int_t>(static_cast<Float_t>(cntLowTime) * truncation); ien++)
415 trdSlicesRemaining[cntRemaining++] = trdSlicesLowTime[indices[ien]];
416 Double_t trdSignal = TMath::Mean(cntRemaining, trdSlicesRemaining);
417 Double_t mom = track->GetOuterParam() ? track->GetOuterParam()->P() : -1;
418 AliDebug(3, Form("PID Meth. 2: p[%f], TRDSignal[%f]", mom, trdSignal));