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()
49 // Default constructor
51 //printf("AliTRDtrackV1::AliTRDtrackV1()\n");
53 for(int i =0; i<3; i++) fBudget[i] = 0.;
55 Float_t pid = 1./AliPID::kSPECIES;
56 for(int is =0; is<AliPID::kSPECIES; is++) fPID[is] = pid;
58 for(int ip=0; ip<kNplane; ip++){
59 fTrackletIndex[ip] = 0xffff;
64 //_______________________________________________________________
65 AliTRDtrackV1::AliTRDtrackV1(const AliTRDtrackV1 &ref) : AliKalmanTrack(ref)
66 ,fPIDquality(ref.fPIDquality)
68 ,fReconstructor(ref.fReconstructor)
75 //printf("AliTRDtrackV1::AliTRDtrackV1(const AliTRDtrackV1 &)\n");
76 SetBit(kOwner, kFALSE);
77 for(int ip=0; ip<kNplane; ip++){
78 fTrackletIndex[ip] = ref.fTrackletIndex[ip];
79 fTracklet[ip] = ref.fTracklet[ip];
82 for (Int_t i = 0; i < 3;i++) fBudget[i] = ref.fBudget[i];
84 for(Int_t is = 0; is<AliPID::kSPECIES; is++) fPID[is] = ref.fPID[is];
86 AliKalmanTrack::SetNumberOfClusters(ref.GetNumberOfClusters());
89 //_______________________________________________________________
90 AliTRDtrackV1::AliTRDtrackV1(const AliESDtrack &t) : AliKalmanTrack()
97 // Constructor from AliESDtrack
100 SetLabel(t.GetLabel());
102 SetMass(t.GetMass());
103 AliKalmanTrack::SetNumberOfClusters(t.GetTRDncls());
104 Int_t ti[kNplane]; t.GetTRDtracklets(&ti[0]);
105 for(int ip=0; ip<kNplane; ip++){
106 fTrackletIndex[ip] = ti[ip] < 0 ? 0xffff : ti[ip];
109 for(int i =0; i<3; i++) fBudget[i] = 0.;
111 Float_t pid = 1./AliPID::kSPECIES;
112 for(int is =0; is<AliPID::kSPECIES; is++) fPID[is] = pid;
114 const AliExternalTrackParam *par = &t;
115 if (t.GetStatus() & AliESDtrack::kTRDbackup) {
116 par = t.GetOuterParam();
118 AliError("No backup info!");
125 ,par->GetCovariance());
127 if(t.GetStatus() & AliESDtrack::kTIME) {
130 t.GetIntegratedTimes(times);
131 SetIntegratedTimes(times);
132 SetIntegratedLength(t.GetIntegratedLength());
136 //_______________________________________________________________
137 AliTRDtrackV1::AliTRDtrackV1(AliTRDseedV1 *trklts, const Double_t p[5], const Double_t cov[15]
138 , Double_t x, Double_t alpha) : AliKalmanTrack()
145 // The stand alone tracking constructor
146 // TEMPORARY !!!!!!!!!!!
148 // 1. covariance matrix
149 // 2. dQdl calculation
152 Double_t cnv = GetBz() < 1.e-5 ? 1.e5 : 1.0 / (GetBz() * kB2C);
153 // Double_t cnv = 1.0 / (GetBz() * kB2C);
155 Double_t pp[5] = { p[0]
161 Double_t c22 = x*x*cov[14] - 2*x*cov[12] + cov[ 5];
162 Double_t c32 = x*cov[13] - cov[ 8];
163 Double_t c20 = x*cov[10] - cov[ 3];
164 Double_t c21 = x*cov[11] - cov[ 4];
165 Double_t c42 = x*cov[14] - cov[12];
167 Double_t cc[15] = { cov[ 0]
170 , cov[ 6], cov[ 7], c32, cov[ 9]
171 , cov[10]*cnv, cov[11]*cnv, c42*cnv, cov[13]*cnv, cov[14]*cnv*cnv };
173 Double_t mostProbablePt=AliExternalTrackParam::GetMostProbablePt();
174 Double_t p0=TMath::Sign(1/mostProbablePt,pp[4]);
175 Double_t w0=cc[14]/(cc[14] + p0*p0), w1=p0*p0/(cc[14] + p0*p0);
176 pp[4] = w0*p0 + w1*pp[4];
177 cc[10]*=w1; cc[11]*=w1; cc[12]*=w1; cc[13]*=w1; cc[14]*=w1;
181 for(int iplane=0; iplane<kNplane; iplane++){
182 fTrackletIndex[iplane] = 0xffff;
183 if(!trklts[iplane].IsOK()) fTracklet[iplane] = 0x0;
185 fTracklet[iplane] = &trklts[iplane];
186 ncls += fTracklet[iplane]->GetN();
189 AliKalmanTrack::SetNumberOfClusters(ncls);
190 for(int i =0; i<3; i++) fBudget[i] = 0.;
192 Float_t pid = 1./AliPID::kSPECIES;
193 for(int is =0; is<AliPID::kSPECIES; is++) fPID[is] = pid;
197 //_______________________________________________________________
198 AliTRDtrackV1::~AliTRDtrackV1()
201 //printf("I-AliTRDtrackV1::~AliTRDtrackV1() : Owner[%s]\n", TestBit(kOwner)?"YES":"NO");
203 if(fBackupTrack) delete fBackupTrack;
206 for(Int_t ip=0; ip<kNplane; ip++){
207 if(TestBit(kOwner) && fTracklet[ip]) delete fTracklet[ip];
209 fTrackletIndex[ip] = 0xffff;
213 //_______________________________________________________________
214 Bool_t AliTRDtrackV1::CookLabel(Float_t wrong)
216 // set MC label for this track
218 Int_t s[kMAXCLUSTERSPERTRACK][2];
219 for (Int_t i = 0; i < kMAXCLUSTERSPERTRACK; i++) {
226 AliTRDcluster *c = 0x0;
227 for (Int_t ip = 0; ip < kNplane; ip++) {
228 if(fTrackletIndex[ip] == 0xffff) continue;
229 for (Int_t ic = 0; ic < AliTRDseed::knTimebins; ic++) {
230 if(!(c = fTracklet[ip]->GetClusters(ic))) continue;
231 for (Int_t k = 0; k < 3; k++) {
232 label = c->GetLabel(k);
236 while ((!labelAdded) && (j < kMAXCLUSTERSPERTRACK)) {
237 if ((s[j][0] == label) ||
252 for (Int_t i = 0; i < kMAXCLUSTERSPERTRACK; i++) {
253 if (s[i][1] <= max) continue;
258 if ((1. - Float_t(max)/GetNumberOfClusters()) > wrong) label = -label;
265 //_______________________________________________________________
266 Bool_t AliTRDtrackV1::CookPID()
269 // Cook the PID information
272 // Reset the a priori probabilities
273 Double_t pid = 1. / AliPID::kSPECIES;
274 for(int ispec=0; ispec<AliPID::kSPECIES; ispec++) {
279 // steer PID calculation @ tracklet level
280 Double_t *prob = 0x0;
281 for(int ip=0; ip<kNplane; ip++){
282 if(fTrackletIndex[ip] == 0xffff) continue;
283 if(!fTracklet[ip]->IsOK()) continue;
284 if(!(prob = fTracklet[ip]->GetProbability())) return kFALSE;
286 Int_t nspec = 0; // quality check of tracklet dEdx
287 for(int ispec=0; ispec<AliPID::kSPECIES; ispec++){
288 if(prob[ispec] < 0.) continue;
289 fPID[ispec] *= prob[ispec];
297 // no tracklet found for PID calculations
298 if(!fPIDquality) return kTRUE;
300 // slot for PID calculation @ track level
303 // normalize probabilities
304 Double_t probTotal = 0.0;
305 for (Int_t is = 0; is < AliPID::kSPECIES; is++) probTotal += fPID[is];
308 if (probTotal <= 0.0) {
309 AliWarning("The total probability over all species <= 0. This may be caused by some error in the reference data.");
313 for (Int_t iSpecies = 0; iSpecies < AliPID::kSPECIES; iSpecies++) fPID[iSpecies] /= probTotal;
318 //_____________________________________________________________________________
319 Double_t AliTRDtrackV1::GetBz() const
322 // Returns Bz component of the magnetic field (kG)
325 if (AliTracker::UniformField()) return AliTracker::GetBz();
329 return AliTracker::GetBz(r);
332 //_______________________________________________________________
333 AliTRDcluster* AliTRDtrackV1::GetCluster(Int_t id)
336 for(Int_t ip=0; ip<kNplane; ip++){
337 if(!fTracklet[ip]) continue;
338 if(n+fTracklet[ip]->GetN() <= id){
339 n+=fTracklet[ip]->GetN();
342 AliTRDcluster *c = 0x0;
343 for(Int_t ic=AliTRDseed::knTimebins-1; ic>=0; ic--){
344 if(!(c = fTracklet[ip]->GetClusters(ic))) continue;
346 if(n<id){n++; continue;}
353 //_______________________________________________________________
354 Int_t AliTRDtrackV1::GetClusterIndex(Int_t id) const
357 for(Int_t ip=0; ip<kNplane; ip++){
358 if(!fTracklet[ip]) continue;
359 if(n+fTracklet[ip]->GetN() <= id){
360 n+=fTracklet[ip]->GetN();
363 AliTRDcluster *c = 0x0;
364 for(Int_t ic=AliTRDseed::knTimebins-1; ic>=0; ic--){
365 if(!(c = fTracklet[ip]->GetClusters(ic))) continue;
367 if(n<id){n++; continue;}
368 return fTracklet[ip]->GetIndexes(ic);
374 //_______________________________________________________________
375 Double_t AliTRDtrackV1::GetPredictedChi2(const AliTRDseedV1 *trklt) const
378 // Get the predicted chi2
381 Double_t x = trklt->GetX0();
382 Double_t p[2] = { trklt->GetYat(x)
383 , trklt->GetZat(x) };
385 trklt->GetCovAt(x, cov);
387 return AliExternalTrackParam::GetPredictedChi2(p, cov);
390 //_______________________________________________________________
391 Bool_t AliTRDtrackV1::IsEqual(const TObject *o) const
393 if (!o) return kFALSE;
394 const AliTRDtrackV1 *inTrack = dynamic_cast<const AliTRDtrackV1*>(o);
395 if (!inTrack) return kFALSE;
397 if ( fPIDquality != inTrack->GetPIDquality() ) return kFALSE;
399 for(Int_t i = 0; i < AliPID::kSPECIES; i++){
400 if ( fPID[i] != inTrack->GetPID(i) ) return kFALSE;
403 for (Int_t i = 0; i < 3; i++){
404 if ( fBudget[i] != inTrack->GetBudget(i) ) return kFALSE;
406 if ( fDE != inTrack->GetEdep() ) return kFALSE;
407 if ( fFakeRatio != inTrack->GetFakeRatio() ) return kFALSE;
408 if ( fChi2 != inTrack->GetChi2() ) return kFALSE;
409 if ( fMass != inTrack->GetMass() ) return kFALSE;
410 if ( fLab != inTrack->GetLabel() ) return kFALSE;
411 if ( fN != inTrack->GetNumberOfClusters() ) return kFALSE;
412 if ( AliKalmanTrack::GetIntegratedLength() != inTrack->GetIntegratedLength() ) return kFALSE;
414 if ( GetX() != inTrack->GetX() ) return kFALSE;
415 if ( GetAlpha() != inTrack->GetAlpha() ) return kFALSE;
416 const Double_t *inP = inTrack->GetParameter();
417 const Double_t *curP = GetParameter();
418 for (Int_t i = 0; i < 5; i++){
419 if ( curP[i] != inP[i]) return kFALSE;
421 const Double_t *inC = inTrack->GetCovariance();
422 const Double_t *curC = GetCovariance();
423 for (Int_t i = 0; i < 15; i++){
424 if ( curC[i] != inC[i]) return kFALSE;
427 for (Int_t iTracklet = 0; iTracklet < kNplane; iTracklet++){
428 AliTRDseedV1 *curTracklet = fTracklet[iTracklet];
429 AliTRDseedV1 *inTracklet = inTrack->GetTracklet(iTracklet);
430 if (curTracklet && inTracklet){
431 if (! curTracklet->IsEqual(inTracklet) ) {
432 curTracklet->Print();
437 // if one tracklet exists, and corresponding
438 // in other track doesn't - return kFALSE
439 if(inTracklet || curTracklet) return kFALSE;
446 //_______________________________________________________________
447 Bool_t AliTRDtrackV1::IsElectron() const
449 if(GetPID(0) > fReconstructor->GetRecoParam()->GetPIDThreshold(GetP())) return kTRUE;
454 //_____________________________________________________________________________
455 void AliTRDtrackV1::MakeBackupTrack()
458 // Creates a backup track
462 fBackupTrack->~AliTRDtrackV1();
463 new(fBackupTrack) AliTRDtrackV1((AliTRDtrackV1&)(*this));
466 fBackupTrack = new AliTRDtrackV1((AliTRDtrackV1&)(*this));
469 //_____________________________________________________________________________
470 Int_t AliTRDtrackV1::GetProlongation(Double_t xk, Double_t &y, Double_t &z)
473 // Find a prolongation at given x
474 // Return 0 if it does not exist
477 Double_t bz = GetBz();
478 if (!AliExternalTrackParam::GetYAt(xk,bz,y)) return 0;
479 if (!AliExternalTrackParam::GetZAt(xk,bz,z)) return 0;
485 //_____________________________________________________________________________
486 Bool_t AliTRDtrackV1::PropagateTo(Double_t xk, Double_t xx0, Double_t xrho)
489 // Propagates this track to a reference plane defined by "xk" [cm]
490 // correcting for the mean crossed material.
492 // "xx0" - thickness/rad.length [units of the radiation length]
493 // "xrho" - thickness*density [g/cm^2]
500 Double_t oldX = GetX();
501 Double_t oldY = GetY();
502 Double_t oldZ = GetZ();
504 Double_t bz = GetBz();
506 if (!AliExternalTrackParam::PropagateTo(xk,bz)) {
516 if (IsStartedTimeIntegral()) {
517 Double_t l2 = TMath::Sqrt((x-oldX)*(x-oldX)
519 + (z-oldZ)*(z-oldZ));
520 Double_t crv = AliExternalTrackParam::GetC(bz);
521 if (TMath::Abs(l2*crv) > 0.0001) {
522 // Make correction for curvature if neccesary
523 l2 = 0.5 * TMath::Sqrt((x-oldX)*(x-oldX)
524 + (y-oldY)*(y-oldY));
525 l2 = 2.0 * TMath::ASin(l2 * crv) / crv;
526 l2 = TMath::Sqrt(l2*l2 + (z-oldZ)*(z-oldZ));
532 if (!AliExternalTrackParam::CorrectForMeanMaterial(xx0,xrho,GetMass())) {
539 Double_t p2 = (1.0 + GetTgl()*GetTgl()) / (GetSigned1Pt()*GetSigned1Pt());
540 Double_t beta2 = p2 / (p2 + GetMass()*GetMass());
541 if ((beta2 < 1.0e-10) ||
542 ((5940.0 * beta2/(1.0 - beta2 + 1.0e-10) - beta2) < 0.0)) {
546 Double_t dE = 0.153e-3 / beta2
547 * (TMath::Log(5940.0 * beta2/(1.0 - beta2 + 1.0e-10)) - beta2)
552 // Suspicious part - think about it ?
553 Double_t kinE = TMath::Sqrt(p2);
554 if (dE > 0.8*kinE) dE = 0.8 * kinE; //
555 if (dE < 0) dE = 0.0; // Not valid region for Bethe bloch
562 Double_t sigmade = 0.07 * TMath::Sqrt(TMath::Abs(dE)); // Energy loss fluctuation
563 Double_t sigmac2 = sigmade*sigmade*fC*fC*(p2+GetMass()*GetMass())/(p2*p2);
565 fCee += fX*fX * sigmac2;
573 //_____________________________________________________________________________
574 Int_t AliTRDtrackV1::PropagateToR(Double_t r,Double_t step)
577 // Propagate track to the radial position
578 // Rotation always connected to the last track position
586 Double_t radius = TMath::Sqrt(GetX()*GetX() + GetY()*GetY());
588 Double_t dir = (radius > r) ? -1.0 : 1.0;
590 for (Double_t x = radius+dir*step; dir*x < dir*r; x += dir*step) {
593 Double_t alpha = TMath::ATan2(xyz0[1],xyz0[0]);
596 GetProlongation(x,y,z);
597 xyz1[0] = x * TMath::Cos(alpha) + y * TMath::Sin(alpha);
598 xyz1[1] = x * TMath::Sin(alpha) - y * TMath::Cos(alpha);
601 if(AliTracker::MeanMaterialBudget(xyz0,xyz1,param)<=0.) return -1;
603 param[1] = 100000000;
605 PropagateTo(x,param[1],param[0]*param[4]);
610 Double_t alpha = TMath::ATan2(xyz0[1],xyz0[0]);
613 GetProlongation(r,y,z);
614 xyz1[0] = r * TMath::Cos(alpha) + y * TMath::Sin(alpha);
615 xyz1[1] = r * TMath::Sin(alpha) - y * TMath::Cos(alpha);
618 if(AliTracker::MeanMaterialBudget(xyz0,xyz1,param) <= 0.) return -1;
621 param[1] = 100000000;
623 PropagateTo(r,param[1],param[0]*param[4]);
629 //_____________________________________________________________________________
630 void AliTRDtrackV1::Print(Option_t *o) const
632 AliInfo(Form("PID q[%d] [%4.1f %4.1f %4.1f %4.1f %4.1f]", fPIDquality, 1.E2*fPID[0], 1.E2*fPID[1], 1.E2*fPID[2], 1.E2*fPID[3], 1.E2*fPID[4]));
633 AliInfo(Form("Material[%5.2f %5.2f %5.2f]", fBudget[0], fBudget[1], fBudget[2]));
635 AliInfo(Form("x[%7.2f] t[%7.4f] alpha[%f] mass[%f]", GetX(), GetIntegratedLength(), GetAlpha(), fMass));
636 AliInfo(Form("Ntr[%1d] Ncl[%3d] lab[%3d]", GetNumberOfTracklets(), fN, fLab));
638 if(strcmp(o, "a")!=0) return;
640 const Double_t *curP = GetParameter();
641 for (Int_t i = 0; i < 5; i++) printf("%7.2f ", curP[i]);
645 const Double_t *curC = GetCovariance();
646 for (Int_t i = 0, j=4, k=0; i<15; i++, k++){
647 printf("%7.2f ", curC[i]);
654 for(Int_t ip=0; ip<kNplane; ip++){
655 if(!fTracklet[ip]) continue;
656 fTracklet[ip]->Print(o);
661 //_____________________________________________________________________________
662 Bool_t AliTRDtrackV1::Rotate(Double_t alpha, Bool_t absolute)
665 // Rotates track parameters in R*phi plane
666 // if absolute rotation alpha is in global system
667 // otherwise alpha rotation is relative to the current rotation angle
670 if (absolute) alpha -= GetAlpha();
673 return AliExternalTrackParam::Rotate(GetAlpha()+alpha);
676 //___________________________________________________________
677 void AliTRDtrackV1::SetNumberOfClusters()
679 // Calculate the number of clusters attached to this track
682 for(int ip=0; ip<kNplane; ip++){
683 if(fTracklet[ip] && fTrackletIndex[ip] != 0xffff) ncls += fTracklet[ip]->GetN();
685 AliKalmanTrack::SetNumberOfClusters(ncls);
689 //_______________________________________________________________
690 void AliTRDtrackV1::SetOwner()
693 // Toggle ownership of tracklets
696 if(TestBit(kOwner)) return;
697 for (Int_t ip = 0; ip < kNplane; ip++) {
698 if(fTrackletIndex[ip] == 0xffff) continue;
699 fTracklet[ip] = new AliTRDseedV1(*fTracklet[ip]);
700 fTracklet[ip]->SetOwner();
705 //_______________________________________________________________
706 void AliTRDtrackV1::SetTracklet(AliTRDseedV1 *trklt, Int_t index)
711 Int_t plane = trklt->GetPlane();
713 fTracklet[plane] = trklt;
714 fTrackletIndex[plane] = index;
717 //_______________________________________________________________
718 void AliTRDtrackV1::UnsetTracklet(Int_t plane)
720 if(plane<0 && plane >= kNplane) return;
721 fTrackletIndex[plane] = 0xffff;
722 fTracklet[plane] = 0x0;
726 //_______________________________________________________________
727 Bool_t AliTRDtrackV1::Update(AliTRDseedV1 *trklt, Double_t chisq)
730 // Update track and tracklet parameters
733 Double_t x = trklt->GetX0();
734 Double_t p[2] = { trklt->GetYat(x)
735 , trklt->GetZat(x) };
737 trklt->GetCovAt(x, cov);
739 if(!AliExternalTrackParam::Update(p, cov)) return kFALSE;
741 AliTRDcluster *c = 0x0;
742 Int_t ic = 0; while(!(c = trklt->GetClusters(ic))) ic++;
743 AliTracker::FillResiduals(this, p, cov, c->GetVolumeId());
746 // Register info to track
747 SetNumberOfClusters();
748 SetChi2(GetChi2() + chisq);
751 trklt->SetMomentum(GetP());
752 trklt->SetSnp(GetSnp());
753 trklt->SetTgl(GetTgl());
757 //_______________________________________________________________
758 void AliTRDtrackV1::UpdateESDtrack(AliESDtrack *track)
761 // Update the TRD PID information in the ESD track
764 Int_t nslices = fReconstructor->IsEightSlices() ? (Int_t)AliTRDReconstructor::kNNslices : (Int_t)AliTRDReconstructor::kLQslices;
765 track->SetNumberOfTRDslices(nslices);
767 for (Int_t ip = 0; ip < kNplane; ip++) {
768 if(fTrackletIndex[ip] == 0xffff) continue;
769 if(!fTracklet[ip]->IsOK()) continue;
770 fTracklet[ip]->CookdEdx(nslices);
771 Float_t *dedx = fTracklet[ip]->GetdEdx();
772 for (Int_t js = 0; js < nslices; js++, dedx++) track->SetTRDslice(*dedx, ip, js);
776 if(!fPIDquality) return;
777 track->SetTRDpid(fPID);
778 track->SetTRDpidQuality(fPIDquality);