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, 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 **************************************************************************/
19 #include "AliESDtrack.h"
20 #include "AliTracker.h"
22 #include "AliTRDtrackV1.h"
23 #include "AliTRDcluster.h"
24 #include "AliTRDcalibDB.h"
25 #include "AliTRDReconstructor.h"
26 #include "AliTRDrecoParam.h"
28 ClassImp(AliTRDtrackV1)
30 ///////////////////////////////////////////////////////////////////////////////
32 // Represents a reconstructed TRD track //
33 // Local TRD Kalman track //
36 // Alex Bercuci <A.Bercuci@gsi.de> //
37 // Markus Fasel <M.Fasel@gsi.de> //
39 ///////////////////////////////////////////////////////////////////////////////
41 //_______________________________________________________________
42 AliTRDtrackV1::AliTRDtrackV1() : AliKalmanTrack()
51 // Default constructor
53 //printf("AliTRDtrackV1::AliTRDtrackV1()\n");
55 for(int i =0; i<3; i++) fBudget[i] = 0.;
57 Float_t pid = 1./AliPID::kSPECIES;
58 for(int is =0; is<AliPID::kSPECIES; is++) fPID[is] = pid;
60 for(int ip=0; ip<kNplane; ip++){
61 fTrackletIndex[ip] = 0xffff;
66 //_______________________________________________________________
67 AliTRDtrackV1::AliTRDtrackV1(const AliTRDtrackV1 &ref) : AliKalmanTrack(ref)
70 ,fReconstructor(ref.fReconstructor)
79 //printf("AliTRDtrackV1::AliTRDtrackV1(const AliTRDtrackV1 &)\n");
80 SetBit(kOwner, kFALSE);
81 for(int ip=0; ip<kNplane; ip++){
82 fTrackletIndex[ip] = ref.fTrackletIndex[ip];
83 fTracklet[ip] = ref.fTracklet[ip];
85 if(ref.fTrackLow) fTrackLow = new AliExternalTrackParam(*ref.fTrackLow);
86 if(ref.fTrackHigh) fTrackHigh = new AliExternalTrackParam(*ref.fTrackHigh);
88 for (Int_t i = 0; i < 3;i++) fBudget[i] = ref.fBudget[i];
90 for(Int_t is = 0; is<AliPID::kSPECIES; is++) fPID[is] = ref.fPID[is];
92 AliKalmanTrack::SetNumberOfClusters(ref.GetNumberOfClusters());
95 //_______________________________________________________________
96 AliTRDtrackV1::AliTRDtrackV1(const AliESDtrack &t) : AliKalmanTrack()
105 // Constructor from AliESDtrack
108 SetLabel(t.GetLabel());
111 SetMass(t.GetMass()/*0.000510*/);
112 AliKalmanTrack::SetNumberOfClusters(t.GetTRDncls());
113 Int_t ti[kNplane]; t.GetTRDtracklets(&ti[0]);
114 for(int ip=0; ip<kNplane; ip++){
115 fTrackletIndex[ip] = ti[ip] < 0 ? 0xffff : ti[ip];
118 for(int i =0; i<3; i++) fBudget[i] = 0.;
120 Float_t pid = 1./AliPID::kSPECIES;
121 for(int is =0; is<AliPID::kSPECIES; is++) fPID[is] = pid;
123 const AliExternalTrackParam *par = &t;
124 if (t.GetStatus() & AliESDtrack::kTRDbackup) {
125 par = t.GetOuterParam();
127 AliError("No backup info!");
134 ,par->GetCovariance());
136 if(t.GetStatus() & AliESDtrack::kTIME) {
139 t.GetIntegratedTimes(times);
140 SetIntegratedTimes(times);
141 SetIntegratedLength(t.GetIntegratedLength());
145 //_______________________________________________________________
146 AliTRDtrackV1::AliTRDtrackV1(AliTRDseedV1 *trklts, const Double_t p[5], const Double_t cov[15]
147 , Double_t x, Double_t alpha) : AliKalmanTrack()
156 // The stand alone tracking constructor
157 // TEMPORARY !!!!!!!!!!!
159 // 1. covariance matrix
160 // 2. dQdl calculation
163 Double_t cnv = GetBz() < 1.e-5 ? 1.e5 : 1.0 / (GetBz() * kB2C);
164 // Double_t cnv = 1.0 / (GetBz() * kB2C);
166 Double_t pp[5] = { p[0]
172 Double_t c22 = x*x*cov[14] - 2*x*cov[12] + cov[ 5];
173 Double_t c32 = x*cov[13] - cov[ 8];
174 Double_t c20 = x*cov[10] - cov[ 3];
175 Double_t c21 = x*cov[11] - cov[ 4];
176 Double_t c42 = x*cov[14] - cov[12];
178 Double_t cc[15] = { cov[ 0]
181 , cov[ 6], cov[ 7], c32, cov[ 9]
182 , cov[10]*cnv, cov[11]*cnv, c42*cnv, cov[13]*cnv, cov[14]*cnv*cnv };
184 Double_t mostProbablePt=AliExternalTrackParam::GetMostProbablePt();
185 Double_t p0=TMath::Sign(1/mostProbablePt,pp[4]);
186 Double_t w0=cc[14]/(cc[14] + p0*p0), w1=p0*p0/(cc[14] + p0*p0);
187 pp[4] = w0*p0 + w1*pp[4];
188 cc[10]*=w1; cc[11]*=w1; cc[12]*=w1; cc[13]*=w1; cc[14]*=w1;
192 for(int iplane=0; iplane<kNplane; iplane++){
193 fTrackletIndex[iplane] = 0xffff;
194 if(!trklts[iplane].IsOK()) fTracklet[iplane] = 0x0;
196 fTracklet[iplane] = &trklts[iplane];
197 ncls += fTracklet[iplane]->GetN();
200 AliKalmanTrack::SetNumberOfClusters(ncls);
201 for(int i =0; i<3; i++) fBudget[i] = 0.;
203 Float_t pid = 1./AliPID::kSPECIES;
204 for(int is =0; is<AliPID::kSPECIES; is++) fPID[is] = pid;
208 //_______________________________________________________________
209 AliTRDtrackV1::~AliTRDtrackV1()
212 //printf("I-AliTRDtrackV1::~AliTRDtrackV1() : Owner[%s]\n", TestBit(kOwner)?"YES":"NO");
214 if(fBackupTrack) delete fBackupTrack; fBackupTrack = 0x0;
216 if(fTrackLow) delete fTrackLow; fTrackLow = 0x0;
217 if(fTrackHigh) delete fTrackHigh; fTrackHigh = 0x0;
219 for(Int_t ip=0; ip<kNplane; ip++){
220 if(TestBit(kOwner) && fTracklet[ip]) delete fTracklet[ip];
222 fTrackletIndex[ip] = 0xffff;
226 //_______________________________________________________________
227 Bool_t AliTRDtrackV1::CookLabel(Float_t wrong)
229 // set MC label for this track
230 if(!GetNumberOfClusters()) return kFALSE;
232 Int_t s[kMAXCLUSTERSPERTRACK][2];
233 for (Int_t i = 0; i < kMAXCLUSTERSPERTRACK; i++) {
240 AliTRDcluster *c = 0x0;
241 for (Int_t ip = 0; ip < kNplane; ip++) {
242 if(fTrackletIndex[ip] == 0xffff) continue;
243 for (Int_t ic = 0; ic < AliTRDseedV1::kNclusters; ic++) {
244 if(!(c = fTracklet[ip]->GetClusters(ic))) continue;
245 for (Int_t k = 0; k < 3; k++) {
246 label = c->GetLabel(k);
250 while ((!labelAdded) && (j < kMAXCLUSTERSPERTRACK)) {
251 if ((s[j][0] == label) ||
266 for (Int_t i = 0; i < kMAXCLUSTERSPERTRACK; i++) {
267 if (s[i][1] <= max) continue;
271 if ((1. - Float_t(max)/GetNumberOfClusters()) > wrong) label = -label;
278 //_______________________________________________________________
279 Bool_t AliTRDtrackV1::CookPID()
282 // Cook the PID information
285 // Reset the a priori probabilities
286 Double_t pid = 1. / AliPID::kSPECIES;
287 for(int ispec=0; ispec<AliPID::kSPECIES; ispec++) fPID[ispec] = pid;
289 UChar_t fPIDquality = SetNumberOfTrackletsPID(kTRUE);
290 // no tracklet found for PID calculations
291 if(!fPIDquality) return kFALSE;
293 // slot for PID calculation @ track level
295 // normalize probabilities
296 Double_t probTotal = 0.0;
297 for (Int_t is = 0; is < AliPID::kSPECIES; is++) probTotal += fPID[is];
300 if (probTotal <= 0.0) {
301 AliWarning("The total probability over all species <= 0. This may be caused by some error in the reference data.");
305 for (Int_t iSpecies = 0; iSpecies < AliPID::kSPECIES; iSpecies++) fPID[iSpecies] /= probTotal;
310 //___________________________________________________________
311 UChar_t AliTRDtrackV1::GetNumberOfTrackletsPID() const
313 // Retrieve number of tracklets used for PID calculation.
317 for(int ip=0; ip<kNplane; ip++){
318 if(fTrackletIndex[ip] == 0xffff) continue;
319 if(!fTracklet[ip]->IsOK()) continue;
320 if(!(prob = fTracklet[ip]->GetProbability(kFALSE))) continue;
322 Int_t nspec = 0; // quality check of tracklet dEdx
323 for(int ispec=0; ispec<AliPID::kSPECIES; ispec++){
324 if(prob[ispec] < 0.) continue;
329 fTracklet[ip]->SetPID();
335 //___________________________________________________________
336 UChar_t AliTRDtrackV1::SetNumberOfTrackletsPID(Bool_t recalc)
338 // Retrieve number of tracklets used for PID calculation. // Recalculated PID at tracklet level by quering the PID DB.
340 UChar_t fPIDquality = 0;
342 // steer PID calculation @ tracklet level
344 for(int ip=0; ip<kNplane; ip++){
345 if(fTrackletIndex[ip] == 0xffff) continue;
346 if(!fTracklet[ip]->IsOK()) continue;
347 if(!(prob = fTracklet[ip]->GetProbability(recalc))) return 0;
349 Int_t nspec = 0; // quality check of tracklet dEdx
350 for(int ispec=0; ispec<AliPID::kSPECIES; ispec++){
351 if(prob[ispec] < 0.) continue;
352 fPID[ispec] *= prob[ispec];
362 //_______________________________________________________________
363 AliTRDcluster* AliTRDtrackV1::GetCluster(Int_t id)
366 for(Int_t ip=0; ip<kNplane; ip++){
367 if(!fTracklet[ip]) continue;
368 if(n+fTracklet[ip]->GetN() <= id){
369 n+=fTracklet[ip]->GetN();
372 AliTRDcluster *c = 0x0;
373 for(Int_t ic=AliTRDseedV1::kNclusters; ic--;){
374 if(!(c = fTracklet[ip]->GetClusters(ic))) continue;
376 if(n<id){n++; continue;}
383 //_______________________________________________________________
384 Int_t AliTRDtrackV1::GetClusterIndex(Int_t id) const
387 for(Int_t ip=0; ip<kNplane; ip++){
388 if(!fTracklet[ip]) continue;
389 if(n+fTracklet[ip]->GetN() <= id){
390 n+=fTracklet[ip]->GetN();
393 AliTRDcluster *c = 0x0;
394 for(Int_t ic=AliTRDseedV1::kNclusters; ic--;){
395 if(!(c = fTracklet[ip]->GetClusters(ic))) continue;
397 if(n<id){n++; continue;}
398 return fTracklet[ip]->GetIndexes(ic);
404 //_______________________________________________________________
405 Double_t AliTRDtrackV1::GetPredictedChi2(const AliTRDseedV1 *trklt, Double_t *cov) const
407 // Compute chi2 between tracklet and track. The value is calculated at the radial position of the track
408 // equal to the reference radial position of the tracklet (see AliTRDseedV1)
410 // The chi2 estimator is computed according to the following formula
412 // #chi^{2}=(X_{trklt}-X_{track})(C_{trklt}+C_{track})^{-1}(X_{trklt}-X_{track})^{T}
414 // where X=(y z), the position of the track/tracklet in the yz plane
417 Double_t p[2] = { trklt->GetY(), trklt->GetZ()};
418 trklt->GetCovAt(trklt->GetX(), cov);
419 return AliExternalTrackParam::GetPredictedChi2(p, cov);
422 //_______________________________________________________________
423 Int_t AliTRDtrackV1::GetSector() const
425 return Int_t(GetAlpha()/AliTRDgeometry::GetAlpha() + (GetAlpha()>0. ? 0 : AliTRDgeometry::kNsector));
428 //_______________________________________________________________
429 Bool_t AliTRDtrackV1::IsEqual(const TObject *o) const
431 if (!o) return kFALSE;
432 const AliTRDtrackV1 *inTrack = dynamic_cast<const AliTRDtrackV1*>(o);
433 if (!inTrack) return kFALSE;
435 //if ( fPIDquality != inTrack->GetPIDquality() ) return kFALSE;
437 for(Int_t i = 0; i < AliPID::kSPECIES; i++){
438 if ( fPID[i] != inTrack->GetPID(i) ) return kFALSE;
441 for (Int_t i = 0; i < 3; i++){
442 if ( fBudget[i] != inTrack->GetBudget(i) ) return kFALSE;
444 if ( fDE != inTrack->GetEdep() ) return kFALSE;
445 if ( fFakeRatio != inTrack->GetFakeRatio() ) return kFALSE;
446 if ( fChi2 != inTrack->GetChi2() ) return kFALSE;
447 if ( fMass != inTrack->GetMass() ) return kFALSE;
448 if ( fLab != inTrack->GetLabel() ) return kFALSE;
449 if ( fN != inTrack->GetNumberOfClusters() ) return kFALSE;
450 if ( AliKalmanTrack::GetIntegratedLength() != inTrack->GetIntegratedLength() ) return kFALSE;
452 if ( GetX() != inTrack->GetX() ) return kFALSE;
453 if ( GetAlpha() != inTrack->GetAlpha() ) return kFALSE;
454 const Double_t *inP = inTrack->GetParameter();
455 const Double_t *curP = GetParameter();
456 for (Int_t i = 0; i < 5; i++){
457 if ( curP[i] != inP[i]) return kFALSE;
459 const Double_t *inC = inTrack->GetCovariance();
460 const Double_t *curC = GetCovariance();
461 for (Int_t i = 0; i < 15; i++){
462 if ( curC[i] != inC[i]) return kFALSE;
465 for (Int_t iTracklet = 0; iTracklet < kNplane; iTracklet++){
466 AliTRDseedV1 *curTracklet = fTracklet[iTracklet];
467 AliTRDseedV1 *inTracklet = inTrack->GetTracklet(iTracklet);
468 if (curTracklet && inTracklet){
469 if (! curTracklet->IsEqual(inTracklet) ) {
470 curTracklet->Print();
475 // if one tracklet exists, and corresponding
476 // in other track doesn't - return kFALSE
477 if(inTracklet || curTracklet) return kFALSE;
484 //_______________________________________________________________
485 Bool_t AliTRDtrackV1::IsElectron() const
487 if(GetPID(0) > fReconstructor->GetRecoParam()->GetPIDThreshold(GetP())) return kTRUE;
492 //_____________________________________________________________________________
493 void AliTRDtrackV1::MakeBackupTrack()
496 // Creates a backup track
500 fBackupTrack->~AliTRDtrackV1();
501 new(fBackupTrack) AliTRDtrackV1((AliTRDtrackV1&)(*this));
504 fBackupTrack = new AliTRDtrackV1((AliTRDtrackV1&)(*this));
507 //_____________________________________________________________________________
508 Int_t AliTRDtrackV1::GetProlongation(Double_t xk, Double_t &y, Double_t &z)
511 // Find a prolongation at given x
512 // Return -1 if it does not exist
515 Double_t bz = GetBz();
516 if (!AliExternalTrackParam::GetYAt(xk,bz,y)) return -1;
517 if (!AliExternalTrackParam::GetZAt(xk,bz,z)) return -1;
523 //_____________________________________________________________________________
524 Bool_t AliTRDtrackV1::PropagateTo(Double_t xk, Double_t xx0, Double_t xrho)
527 // Propagates this track to a reference plane defined by "xk" [cm]
528 // correcting for the mean crossed material.
530 // "xx0" - thickness/rad.length [units of the radiation length]
531 // "xrho" - thickness*density [g/cm^2]
538 Double_t oldX = GetX();
539 Double_t oldY = GetY();
540 Double_t oldZ = GetZ();
542 Double_t bz = GetBz();
544 if (!AliExternalTrackParam::PropagateTo(xk,bz)) {
554 if (IsStartedTimeIntegral()) {
555 Double_t l2 = TMath::Sqrt((x-oldX)*(x-oldX)
557 + (z-oldZ)*(z-oldZ));
558 Double_t crv = AliExternalTrackParam::GetC(bz);
559 if (TMath::Abs(l2*crv) > 0.0001) {
560 // Make correction for curvature if neccesary
561 l2 = 0.5 * TMath::Sqrt((x-oldX)*(x-oldX)
562 + (y-oldY)*(y-oldY));
563 l2 = 2.0 * TMath::ASin(l2 * crv) / crv;
564 l2 = TMath::Sqrt(l2*l2 + (z-oldZ)*(z-oldZ));
570 if (!AliExternalTrackParam::CorrectForMeanMaterial(xx0, xrho, GetMass())) return kFALSE;
576 Double_t p2 = (1.0 + GetTgl()*GetTgl()) / (GetSigned1Pt()*GetSigned1Pt());
577 Double_t beta2 = p2 / (p2 + GetMass()*GetMass());
578 if ((beta2 < 1.0e-10) ||
579 ((5940.0 * beta2/(1.0 - beta2 + 1.0e-10) - beta2) < 0.0)) {
583 Double_t dE = 0.153e-3 / beta2
584 * (TMath::Log(5940.0 * beta2/(1.0 - beta2 + 1.0e-10)) - beta2)
589 // Suspicious part - think about it ?
590 Double_t kinE = TMath::Sqrt(p2);
591 if (dE > 0.8*kinE) dE = 0.8 * kinE; //
592 if (dE < 0) dE = 0.0; // Not valid region for Bethe bloch
599 Double_t sigmade = 0.07 * TMath::Sqrt(TMath::Abs(dE)); // Energy loss fluctuation
600 Double_t sigmac2 = sigmade*sigmade*fC*fC*(p2+GetMass()*GetMass())/(p2*p2);
602 fCee += fX*fX * sigmac2;
610 //_____________________________________________________________________________
611 Int_t AliTRDtrackV1::PropagateToR(Double_t r,Double_t step)
614 // Propagate track to the radial position
615 // Rotation always connected to the last track position
623 Double_t radius = TMath::Sqrt(GetX()*GetX() + GetY()*GetY());
625 Double_t dir = (radius > r) ? -1.0 : 1.0;
627 for (Double_t x = radius+dir*step; dir*x < dir*r; x += dir*step) {
630 Double_t alpha = TMath::ATan2(xyz0[1],xyz0[0]);
633 if(GetProlongation(x,y,z)<0) return -1;
634 xyz1[0] = x * TMath::Cos(alpha) + y * TMath::Sin(alpha);
635 xyz1[1] = x * TMath::Sin(alpha) - y * TMath::Cos(alpha);
638 if(AliTracker::MeanMaterialBudget(xyz0,xyz1,param)<=0.) return -1;
640 param[1] = 100000000;
642 PropagateTo(x,param[1],param[0]*param[4]);
647 Double_t alpha = TMath::ATan2(xyz0[1],xyz0[0]);
650 if(GetProlongation(r,y,z)<0) return -1;
651 xyz1[0] = r * TMath::Cos(alpha) + y * TMath::Sin(alpha);
652 xyz1[1] = r * TMath::Sin(alpha) - y * TMath::Cos(alpha);
655 if(AliTracker::MeanMaterialBudget(xyz0,xyz1,param) <= 0.) return -1;
658 param[1] = 100000000;
660 PropagateTo(r,param[1],param[0]*param[4]);
666 //_____________________________________________________________________________
667 void AliTRDtrackV1::Print(Option_t *o) const
669 AliInfo(Form("PID [%4.1f %4.1f %4.1f %4.1f %4.1f]", 1.E2*fPID[0], 1.E2*fPID[1], 1.E2*fPID[2], 1.E2*fPID[3], 1.E2*fPID[4]));
670 AliInfo(Form("Material[%5.2f %5.2f %5.2f]", fBudget[0], fBudget[1], fBudget[2]));
672 AliInfo(Form("x[%7.2f] t[%7.4f] alpha[%f] mass[%f]", GetX(), GetIntegratedLength(), GetAlpha(), fMass));
673 AliInfo(Form("Ntr[%1d] NtrPID[%1d] Ncl[%3d] lab[%3d]", GetNumberOfTracklets(), GetNumberOfTrackletsPID(), fN, fLab));
675 if(strcmp(o, "a")!=0) return;
677 const Double_t *curP = GetParameter();
678 for (Int_t i = 0; i < 5; i++) printf("%7.2f ", curP[i]);
682 const Double_t *curC = GetCovariance();
683 for (Int_t i = 0, j=4, k=0; i<15; i++, k++){
684 printf("%7.2f ", curC[i]);
691 for(Int_t ip=0; ip<kNplane; ip++){
692 if(!fTracklet[ip]) continue;
693 fTracklet[ip]->Print(o);
698 //_____________________________________________________________________________
699 Bool_t AliTRDtrackV1::Rotate(Double_t alpha, Bool_t absolute)
702 // Rotates track parameters in R*phi plane
703 // if absolute rotation alpha is in global system
704 // otherwise alpha rotation is relative to the current rotation angle
707 if (absolute) alpha -= GetAlpha();
710 return AliExternalTrackParam::Rotate(GetAlpha()+alpha);
713 //___________________________________________________________
714 void AliTRDtrackV1::SetNumberOfClusters()
716 // Calculate the number of clusters attached to this track
719 for(int ip=0; ip<kNplane; ip++){
720 if(fTracklet[ip] && fTrackletIndex[ip] != 0xffff) ncls += fTracklet[ip]->GetN();
722 AliKalmanTrack::SetNumberOfClusters(ncls);
726 //_______________________________________________________________
727 void AliTRDtrackV1::SetOwner()
730 // Toggle ownership of tracklets
733 if(TestBit(kOwner)) return;
734 for (Int_t ip = 0; ip < kNplane; ip++) {
735 if(fTrackletIndex[ip] == 0xffff) continue;
736 fTracklet[ip] = new AliTRDseedV1(*fTracklet[ip]);
737 fTracklet[ip]->SetOwner();
742 //_______________________________________________________________
743 void AliTRDtrackV1::SetTracklet(AliTRDseedV1 *trklt, Int_t index)
748 Int_t plane = trklt->GetPlane();
750 fTracklet[plane] = trklt;
751 fTrackletIndex[plane] = index;
754 //_______________________________________________________________
755 void AliTRDtrackV1::SetTrackLow()
757 const AliExternalTrackParam *op = dynamic_cast<const AliExternalTrackParam*>(this);
758 fTrackLow = fTrackLow ? new(fTrackLow) AliExternalTrackParam(*op) : new AliExternalTrackParam(*op);
761 //_______________________________________________________________
762 void AliTRDtrackV1::SetTrackHigh(const AliExternalTrackParam *op)
764 if(!op) op = dynamic_cast<const AliExternalTrackParam*>(this);
765 fTrackHigh = fTrackHigh ? new(fTrackHigh) AliExternalTrackParam(*op) : new AliExternalTrackParam(*op);
768 //_______________________________________________________________
769 void AliTRDtrackV1::UnsetTracklet(Int_t plane)
771 if(plane<0 && plane >= kNplane) return;
772 fTrackletIndex[plane] = 0xffff;
773 fTracklet[plane] = 0x0;
777 //_______________________________________________________________
778 Bool_t AliTRDtrackV1::Update(Double_t *p, Double_t *cov, Double_t chi2)
783 if(!AliExternalTrackParam::Update(p, cov)) return kFALSE;
785 // Register info to track
786 SetNumberOfClusters();
787 SetChi2(GetChi2() + chi2);
791 //_______________________________________________________________
792 void AliTRDtrackV1::UpdateESDtrack(AliESDtrack *track)
795 // Update the TRD PID information in the ESD track
798 Int_t nslices = fReconstructor->IsEightSlices() ? (Int_t)AliTRDpidUtil::kNNslices : (Int_t)AliTRDpidUtil::kLQslices;
799 // number of tracklets used for PID calculation
800 UChar_t nPID = GetNumberOfTrackletsPID();
801 // number of tracklets attached to the track
802 UChar_t nTrk = GetNumberOfTracklets();
803 // pack the two numbers together and store them in the ESD
804 track->SetTRDntracklets(nPID | (nTrk<<3));
805 // allocate space to store raw PID signals dEdx & momentum
806 track->SetNumberOfTRDslices((nslices+2)*AliTRDgeometry::kNlayer);
808 Float_t p, sp; Double_t spd;
809 for (Int_t ip = 0; ip < kNplane; ip++) {
810 if(fTrackletIndex[ip] == 0xffff) continue;
811 if(!fTracklet[ip]->HasPID()) continue;
812 Float_t *dedx = fTracklet[ip]->GetdEdx();
813 for (Int_t js = 0; js < nslices; js++, dedx++) track->SetTRDslice(*dedx, ip, js);
814 p = fTracklet[ip]->GetMomentum(&sp); spd = sp;
815 track->SetTRDmomentum(p, ip, &spd);
817 // store PID probabilities
818 track->SetTRDpid(fPID);