2 /**************************************************************************
3 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
5 * Author: The ALICE Off-line Project. *
6 * Contributors are mentioned in the code where appropriate. *
8 * Permission to use, copy, modify and distribute this software and its *
9 * documentation strictly for non-commercial purposes is hereby granted *
10 * without fee, provided that the above copyright notice appears in all *
11 * copies and that both the copyright notice and this permission notice *
12 * appear in the supporting documentation. The authors make no claims *
13 * about the suitability of this software for any purpose. It is *
14 * provided "as is" without express or implied warranty. *
15 **************************************************************************/
20 #include "AliESDtrack.h"
21 #include "AliTracker.h"
23 #include "AliTRDtrackV1.h"
24 #include "AliTRDcluster.h"
25 #include "AliTRDcalibDB.h"
26 #include "AliTRDReconstructor.h"
27 #include "AliTRDPIDResponse.h"
28 #include "AliTRDrecoParam.h"
30 ClassImp(AliTRDtrackV1)
32 ///////////////////////////////////////////////////////////////////////////////
34 // Represents a reconstructed TRD track //
35 // Local TRD Kalman track //
38 // Alex Bercuci <A.Bercuci@gsi.de> //
39 // Markus Fasel <M.Fasel@gsi.de> //
41 ///////////////////////////////////////////////////////////////////////////////
43 //_______________________________________________________________
44 AliTRDtrackV1::AliTRDtrackV1() : AliKalmanTrack()
48 ,fkReconstructor(NULL)
54 // Default constructor
56 //printf("AliTRDtrackV1::AliTRDtrackV1()\n");
58 for(int i =0; i<3; i++) fBudget[i] = 0.;
60 Float_t pid = 1./AliPID::kSPECIES;
61 for(int is =0; is<AliPID::kSPECIES; is++) fPID[is] = pid;
63 for(int ip=0; ip<kNplane; ip++){
64 fTrackletIndex[ip] = -1;
69 //_______________________________________________________________
70 AliTRDtrackV1::AliTRDtrackV1(const AliTRDtrackV1 &ref) : AliKalmanTrack(ref)
74 ,fkReconstructor(ref.fkReconstructor)
83 //printf("AliTRDtrackV1::AliTRDtrackV1(const AliTRDtrackV1 &)\n");
84 SetBit(kOwner, kFALSE);
85 for(int ip=0; ip<kNplane; ip++){
86 fTrackletIndex[ip] = ref.fTrackletIndex[ip];
87 fTracklet[ip] = ref.fTracklet[ip];
89 if(ref.fTrackLow) fTrackLow = new AliExternalTrackParam(*ref.fTrackLow);
90 if(ref.fTrackHigh) fTrackHigh = new AliExternalTrackParam(*ref.fTrackHigh);
92 for (Int_t i = 0; i < 3;i++) fBudget[i] = ref.fBudget[i];
94 for(Int_t is = 0; is<AliPID::kSPECIES; is++) fPID[is] = ref.fPID[is];
96 AliKalmanTrack::SetNumberOfClusters(ref.GetNumberOfClusters());
99 //_______________________________________________________________
100 AliTRDtrackV1::AliTRDtrackV1(const AliESDtrack &t) : AliKalmanTrack()
104 ,fkReconstructor(NULL)
110 // Constructor from AliESDtrack
114 SetLabel(t.GetLabel());
117 SetMass(t.GetMass(kTRUE));
118 AliKalmanTrack::SetNumberOfClusters(t.GetTRDncls());
119 Int_t ti[]={-1, -1, -1, -1, -1, -1}; t.GetTRDtracklets(&ti[0]);
120 for(int ip=0; ip<kNplane; ip++){
121 fTrackletIndex[ip] = ti[ip];
122 fTracklet[ip] = NULL;
124 for(int i =0; i<3; i++) fBudget[i] = 0.;
126 Float_t pid = 1./AliPID::kSPECIES;
127 for(int is =0; is<AliPID::kSPECIES; is++) fPID[is] = pid;
129 const AliExternalTrackParam *par = &t;
130 if (t.GetStatus() & AliESDtrack::kTRDbackup) {
131 par = t.GetOuterParam();
133 AliError("No backup info!");
140 ,par->GetCovariance());
142 if(t.GetStatus() & AliESDtrack::kTIME) {
145 t.GetIntegratedTimes(times);
146 SetIntegratedTimes(times);
147 SetIntegratedLength(t.GetIntegratedLength());
151 //_______________________________________________________________
152 AliTRDtrackV1::AliTRDtrackV1(AliTRDseedV1 * const trklts, const Double_t p[5], const Double_t cov[15]
153 , Double_t x, Double_t alpha) : AliKalmanTrack()
157 ,fkReconstructor(NULL)
163 // The stand alone tracking constructor
164 // TEMPORARY !!!!!!!!!!!
166 // 1. covariance matrix
167 // 2. dQdl calculation
171 Double_t cnv = (TMath::Abs(b) < 1.e-5) ? 1.e5 : 1./GetBz()/kB2C;
173 Double_t pp[5] = { p[0]
179 Double_t c22 = x*x*cov[14] - 2*x*cov[12] + cov[ 5];
180 Double_t c32 = x*cov[13] - cov[ 8];
181 Double_t c20 = x*cov[10] - cov[ 3];
182 Double_t c21 = x*cov[11] - cov[ 4];
183 Double_t c42 = x*cov[14] - cov[12];
185 Double_t cc[15] = { cov[ 0]
188 , cov[ 6], cov[ 7], c32, cov[ 9]
189 , cov[10]*cnv, cov[11]*cnv, c42*cnv, cov[13]*cnv, cov[14]*cnv*cnv };
191 Double_t mostProbablePt=AliExternalTrackParam::GetMostProbablePt();
192 Double_t p0=TMath::Sign(1/mostProbablePt,pp[4]);
193 Double_t w0=cc[14]/(cc[14] + p0*p0), w1=p0*p0/(cc[14] + p0*p0);
194 AliDebug(3, Form("Pt mixing : w0[%4.2f] pt0[%5.3f] w1[%4.2f] pt[%5.3f]", w0, 1./p0, w1, 1./pp[4]));
196 pp[4] = w0*p0 + w1*pp[4];
197 cc[10]*=w1; cc[11]*=w1; cc[12]*=w1; cc[13]*=w1; cc[14]*=w1;
199 AliDebug(2, Form("Init @ x[%6.2f] pt[%5.3f]", x, 1./pp[4]));
201 for(int iplane=0; iplane<kNplane; iplane++){
202 fTrackletIndex[iplane] = -1;
203 if(!trklts[iplane].IsOK()) fTracklet[iplane] = NULL;
205 fTracklet[iplane] = &trklts[iplane];
206 ncls += fTracklet[iplane]->GetN();
209 AliKalmanTrack::SetNumberOfClusters(ncls);
210 for(int i =0; i<3; i++) fBudget[i] = 0.;
212 Float_t pid = 1./AliPID::kSPECIES;
213 for(int is =0; is<AliPID::kSPECIES; is++) fPID[is] = pid;
216 //_______________________________________________________________
217 AliTRDtrackV1::~AliTRDtrackV1()
219 // Clean up all objects allocated by the track during its lifetime.
220 AliDebug(2, Form("Deleting track[%d]\n fBackupTrack[%p] fTrackLow[%p] fTrackHigh[%p] Owner[%c].", fESDid, (void*)fBackupTrack, (void*)fTrackLow, (void*)fTrackHigh, TestBit(kOwner)?'y':'n'));
222 if(fBackupTrack) delete fBackupTrack; fBackupTrack = NULL;
224 if(fTrackLow) delete fTrackLow; fTrackLow = NULL;
225 if(fTrackHigh) delete fTrackHigh; fTrackHigh = NULL;
227 for(Int_t ip=0; ip<kNplane; ip++){
228 if(TestBit(kOwner) && fTracklet[ip]) delete fTracklet[ip];
229 fTracklet[ip] = NULL;
230 fTrackletIndex[ip] = -1;
234 //_______________________________________________________________
235 AliTRDtrackV1 &AliTRDtrackV1::operator=(const AliTRDtrackV1 &t)
238 // Assignment operator
242 AliKalmanTrack::operator=(t);
243 ((AliTRDtrackV1 &) t).Copy(*this);
250 //_____________________________________________________________________________
251 void AliTRDtrackV1::Copy(TObject &t) const
257 ((AliTRDtrackV1 &) t).fStatus = fStatus;
258 ((AliTRDtrackV1 &) t).fESDid = fESDid;
259 ((AliTRDtrackV1 &) t).fDE = fDE;
260 ((AliTRDtrackV1 &) t).fkReconstructor = fkReconstructor;
261 ((AliTRDtrackV1 &) t).fBackupTrack = 0x0;
262 ((AliTRDtrackV1 &) t).fTrackLow = 0x0;
263 ((AliTRDtrackV1 &) t).fTrackHigh = 0x0;
265 for(Int_t ip = 0; ip < kNplane; ip++) {
266 ((AliTRDtrackV1 &) t).fTrackletIndex[ip] = fTrackletIndex[ip];
267 ((AliTRDtrackV1 &) t).fTracklet[ip] = fTracklet[ip];
270 ((AliTRDtrackV1 &) t).fTrackLow = new AliExternalTrackParam(*fTrackLow);
273 ((AliTRDtrackV1 &) t).fTrackHigh = new AliExternalTrackParam(*fTrackHigh);
276 for (Int_t i = 0; i < 3; i++) {
277 ((AliTRDtrackV1 &) t).fBudget[i] = fBudget[i];
279 for (Int_t is = 0; is < AliPID::kSPECIES; is++) {
280 ((AliTRDtrackV1 &) t).fPID[is] = fPID[is];
285 //_______________________________________________________________
286 Int_t AliTRDtrackV1::CookLabel(Float_t wrong, Int_t *labs, Float_t *freq)
288 // Set MC label for this track
289 // On demand i.e. if arrays "labs" and "freq" are allocated by user returns :
290 // nlabs = the no of distinct labels
291 // labs = array of distinct labels in decreasing order of frequency
292 // freq = frequency of each label in decreasing order
295 if(!(ncl = GetNumberOfClusters())) return 0;
297 Int_t s[2][kMAXCLUSTERSPERTRACK];
298 for (Int_t i = 0; i < kMAXCLUSTERSPERTRACK; i++) {
303 Int_t label(-123456789), nlabels(0);
304 AliTRDcluster *c(NULL);
305 for (Int_t ip(0); ip < AliTRDgeometry::kNlayer; ip++) {
306 if(fTrackletIndex[ip]<0 || !fTracklet[ip]) continue;
307 for (Int_t ic(0); ic < AliTRDseedV1::kNclusters; ic++) {
308 if(!(c = fTracklet[ip]->GetClusters(ic))) continue;
309 for (Int_t k(0); k < 3; k++) {
310 if ((label = c->GetLabel(k)) < 0) continue;
312 while(j < kMAXCLUSTERSPERTRACK){
313 if(s[0][j]!=label && s[1][j]!=0){j++; continue;}
314 if(!s[1][j]) nlabels++;
315 s[0][j] = label; s[1][j]++;
321 //printf(" Found %4d labels\n", nlabels);
324 AliError(Form("No MC labels found for track %d.", fESDid));
326 } else if(nlabels==1) {
328 if(labs && freq){labs[0]=label; freq[0]=1.;}
330 Int_t idx[kMAXCLUSTERSPERTRACK];
331 TMath::Sort(nlabels, s[1], idx);
332 label = s[0][idx[0]]; prob = s[1][idx[0]]/Float_t(ncl);
334 for (Int_t i(0); i<nlabels; i++){
335 labs[i] = s[0][idx[i]];
336 freq[i] = s[1][idx[i]]/Float_t(ncl);
340 SetLabel((1.-prob > wrong)?-label:label);
344 //_______________________________________________________________
345 Bool_t AliTRDtrackV1::CookPID()
348 // Cook the PID information for the track by delegating the omonim function of the tracklets.
349 // Computes the number of tracklets used. The tracklet information are considered independent.
350 // For the moment no global track measurement of PID is performed as for example to estimate
351 // bremsstrahlung probability based on global chi2 of the track.
353 // The status bit AliESDtrack::kTRDpid is set during the call of AliTRDtrackV1::UpdateESDtrack().The PID performance of the
354 //TRD for tracks with 6 tacklets is displayed below.
356 //<img src="TRD/trackPID.gif">
359 const AliTRDPIDResponse *pidResponse = AliTRDcalibDB::Instance()->GetPIDResponse(fkReconstructor->GetRecoParam()->GetPIDmethod());
361 AliError("PID Response not available");
364 Int_t nslices = pidResponse->GetNumberOfSlices();
365 Double_t dEdx[kNplane * (Int_t)AliTRDPIDResponse::kNslicesNN];
366 Float_t trackletP[kNplane];
367 memset(dEdx, 0, sizeof(Double_t) * kNplane * (Int_t)AliTRDPIDResponse::kNslicesNN);
368 memset(trackletP, 0, sizeof(Float_t)*kNplane);
369 for(Int_t iseed = 0; iseed < kNplane; iseed++){
370 if(!fTracklet[iseed]) continue;
371 trackletP[iseed] = fTracklet[iseed]->GetMomentum();
372 fTracklet[iseed]->SetPID();
373 if(pidResponse->GetPIDmethod() == AliTRDPIDResponse::kLQ1D){
374 dEdx[iseed] = fTracklet[iseed]->GetdQdl();
376 fTracklet[iseed]->CookdEdx(nslices);
377 const Float_t *trackletdEdx = fTracklet[iseed]->GetdEdx();
378 for(Int_t islice = 0; islice < nslices; islice++){
379 dEdx[iseed*nslices + islice] = trackletdEdx[islice];
383 pidResponse->GetResponse(nslices, dEdx, trackletP, fPID);
387 //___________________________________________________________
388 UChar_t AliTRDtrackV1::GetNumberOfTrackletsPID() const
390 // Retrieve number of tracklets used for PID calculation.
393 for(int ip=0; ip<kNplane; ip++){
394 if(fTrackletIndex[ip]<0 || !fTracklet[ip]) continue;
395 if(!fTracklet[ip]->IsOK()) continue;
402 //_______________________________________________________________
403 AliTRDcluster* AliTRDtrackV1::GetCluster(Int_t id)
405 // Get the cluster at a certain position in the track
407 for(Int_t ip=0; ip<kNplane; ip++){
408 if(!fTracklet[ip]) continue;
409 if(n+fTracklet[ip]->GetN() <= id){
410 n+=fTracklet[ip]->GetN();
413 AliTRDcluster *c = NULL;
414 for(Int_t ic=AliTRDseedV1::kNclusters; ic--;){
415 if(!(c = fTracklet[ip]->GetClusters(ic))) continue;
417 if(n<id){n++; continue;}
424 //_______________________________________________________________
425 Int_t AliTRDtrackV1::GetClusterIndex(Int_t id) const
427 // Get the cluster index at a certain position in the track
429 for(Int_t ip=0; ip<kNplane; ip++){
430 if(!fTracklet[ip]) continue;
431 if(n+fTracklet[ip]->GetN() <= id){
432 n+=fTracklet[ip]->GetN();
435 for(Int_t ic=AliTRDseedV1::kNclusters; ic--;){
436 if(!(fTracklet[ip]->GetClusters(ic))) continue;
437 if(n<id){n++; continue;}
438 return fTracklet[ip]->GetIndexes(ic);
444 //_______________________________________________________________
445 Double_t AliTRDtrackV1::GetPredictedChi2(const AliTRDseedV1 *trklt, Double_t *cov) const
447 // Compute chi2 between tracklet and track. The value is calculated at the radial position of the track
448 // equal to the reference radial position of the tracklet (see AliTRDseedV1)
450 // The chi2 estimator is computed according to the following formula
452 // #chi^{2}=(X_{trklt}-X_{track})(C_{trklt}+C_{track})^{-1}(X_{trklt}-X_{track})^{T}
454 // where X=(y z), the position of the track/tracklet in the yz plane
457 Double_t p[2] = { trklt->GetY(), trklt->GetZ()};
458 trklt->GetCovAt(trklt->GetX(), cov);
459 return AliExternalTrackParam::GetPredictedChi2(p, cov);
462 //_______________________________________________________________
463 Int_t AliTRDtrackV1::GetSector() const
465 return Int_t(GetAlpha()/AliTRDgeometry::GetAlpha() + (GetAlpha()>0. ? 0 : AliTRDgeometry::kNsector));
468 //_______________________________________________________________
469 Bool_t AliTRDtrackV1::IsEqual(const TObject *o) const
471 // Checks whether two tracks are equal
472 if (!o) return kFALSE;
473 const AliTRDtrackV1 *inTrack = dynamic_cast<const AliTRDtrackV1*>(o);
474 if (!inTrack) return kFALSE;
476 //if ( fPIDquality != inTrack->GetPIDquality() ) return kFALSE;
478 if(memcmp(fPID, inTrack->fPID, AliPID::kSPECIES*sizeof(Double32_t))) return kFALSE;
479 if(memcmp(fBudget, inTrack->fBudget, 3*sizeof(Double32_t))) return kFALSE;
480 if(memcmp(&fDE, &inTrack->fDE, sizeof(Double32_t))) return kFALSE;
481 if(memcmp(&fFakeRatio, &inTrack->fFakeRatio, sizeof(Double32_t))) return kFALSE;
482 if(memcmp(&fChi2, &inTrack->fChi2, sizeof(Double32_t))) return kFALSE;
483 if(memcmp(&fMass, &inTrack->fMass, sizeof(Double32_t))) return kFALSE;
484 if( fLab != inTrack->fLab ) return kFALSE;
485 if( fN != inTrack->fN ) return kFALSE;
486 Double32_t l(0.), in(0.);
487 l = GetIntegratedLength(); in = inTrack->GetIntegratedLength();
488 if(memcmp(&l, &in, sizeof(Double32_t))) return kFALSE;
489 l=GetX(); in=inTrack->GetX();
490 if(memcmp(&l, &in, sizeof(Double32_t))) return kFALSE;
491 l = GetAlpha(); in = inTrack->GetAlpha();
492 if(memcmp(&l, &in, sizeof(Double32_t))) return kFALSE;
493 if(memcmp(GetParameter(), inTrack->GetParameter(), 5*sizeof(Double32_t))) return kFALSE;
494 if(memcmp(GetCovariance(), inTrack->GetCovariance(), 15*sizeof(Double32_t))) return kFALSE;
496 for (Int_t iTracklet = 0; iTracklet < kNplane; iTracklet++){
497 AliTRDseedV1 *curTracklet = fTracklet[iTracklet];
498 AliTRDseedV1 *inTracklet = inTrack->GetTracklet(iTracklet);
499 if (curTracklet && inTracklet){
500 if (! curTracklet->IsEqual(inTracklet) ) {
501 curTracklet->Print();
506 // if one tracklet exists, and corresponding
507 // in other track doesn't - return kFALSE
508 if(inTracklet || curTracklet) return kFALSE;
515 //_______________________________________________________________
516 Bool_t AliTRDtrackV1::IsElectron() const
518 if(GetPID(0) > fkReconstructor->GetRecoParam()->GetPIDThreshold(GetP())) return kTRUE;
523 //_____________________________________________________________________________
524 Int_t AliTRDtrackV1::MakeBackupTrack()
527 // Creates a backup track
528 // TO DO update quality check of the track.
531 Float_t occupancy(0.); Int_t n(0), ncls(0);
532 for(Int_t il(AliTRDgeometry::kNlayer); il--;){
533 if(!fTracklet[il]) continue;
535 occupancy+=fTracklet[il]->GetTBoccupancy()/AliTRDseedV1::kNtb;
536 ncls += fTracklet[il]->GetN();
541 //Float_t ratio1 = Float_t(t.GetNumberOfClusters()+1) / Float_t(t.GetNExpected()+1);
543 Int_t failedCutId(0);
544 if(GetChi2()/n > 5.0) failedCutId=1;
545 if(occupancy < 0.7) failedCutId=2;
546 //if(ratio1 > 0.6) &&
547 //if(ratio0+ratio1 > 1.5) &&
548 if(GetNCross() != 0) failedCutId=3;
549 if(TMath::Abs(GetSnp()) > 0.85) failedCutId=4;
550 if(ncls < 20) failedCutId=5;
553 AliDebug(2, Form("\n"
554 "chi2/tracklet < 5.0 [%c] %5.2f\n"
555 "occupancy > 0.7 [%c] %4.2f\n"
556 "NCross == 0 [%c] %d\n"
557 "Abs(snp) < 0.85 [%c] %4.2f\n"
558 "NClusters > 20 [%c] %d"
559 ,(GetChi2()/n<5.0)?'y':'n', GetChi2()/n
560 ,(occupancy>0.7)?'y':'n', occupancy
561 ,(GetNCross()==0)?'y':'n', GetNCross()
562 ,(TMath::Abs(GetSnp())<0.85)?'y':'n', TMath::Abs(GetSnp())
563 ,(ncls>20)?'y':'n', ncls
569 fBackupTrack->~AliTRDtrackV1();
570 new(fBackupTrack) AliTRDtrackV1((AliTRDtrackV1&)(*this));
573 fBackupTrack = new AliTRDtrackV1((AliTRDtrackV1&)(*this));
577 //_____________________________________________________________________________
578 Int_t AliTRDtrackV1::GetProlongation(Double_t xk, Double_t &y, Double_t &z) const
581 // Find a prolongation at given x
582 // Return -1 if it does not exist
585 Double_t bz = GetBz();
586 if (!AliExternalTrackParam::GetYAt(xk,bz,y)) return -1;
587 if (!AliExternalTrackParam::GetZAt(xk,bz,z)) return -1;
593 //_____________________________________________________________________________
594 Bool_t AliTRDtrackV1::PropagateTo(Double_t xk, Double_t xx0, Double_t xrho)
597 // Propagates this track to a reference plane defined by "xk" [cm]
598 // correcting for the mean crossed material.
600 // "xx0" - thickness/rad.length [units of the radiation length]
601 // "xrho" - thickness*density [g/cm^2]
604 if (TMath::Abs(xk - GetX())<AliTRDReconstructor::GetEpsilon()*0.1) return kTRUE; // 10% of the tracker precision
606 Double_t xyz0[3] = {GetX(), GetY(), GetZ()}, // track position BEFORE propagation
607 b[3]; // magnetic field
609 if(!AliExternalTrackParam::PropagateToBxByBz(xk,b)) return kFALSE;
611 // local track position AFTER propagation
612 Double_t xyz1[3] = {GetX(), GetY(), GetZ()};
613 // printf("x0[%6.2f] -> x1[%6.2f] dx[%6.2f] rho[%f]\n", xyz0[0], xyz1[0], xyz0[0]-xk, xrho/TMath::Abs(xyz0[0]-xk));
616 if (IsStartedTimeIntegral()) {
617 Double_t l2 = TMath::Sqrt((xyz1[0]-xyz0[0])*(xyz1[0]-xyz0[0])
618 + (xyz1[1]-xyz0[1])*(xyz1[1]-xyz0[1])
619 + (xyz1[2]-xyz0[2])*(xyz1[2]-xyz0[2]));
620 Double_t crv = AliExternalTrackParam::GetC(b[2]);
621 if (TMath::Abs(l2*crv) > 0.0001) {
622 // Make correction for curvature if neccesary
623 l2 = 0.5 * TMath::Sqrt((xyz1[0]-xyz0[0])*(xyz1[0]-xyz0[0])
624 + (xyz1[1]-xyz0[1])*(xyz1[1]-xyz0[1]));
625 l2 = 2.0 * TMath::ASin(l2 * crv) / crv;
626 l2 = TMath::Sqrt(l2*l2 + (xyz1[2]-xyz0[2])*(xyz1[2]-xyz0[2]));
631 if (!AliExternalTrackParam::CorrectForMeanMaterial(xx0, xrho, fMass)) return kFALSE;
637 Double_t p2 = (1.0 + GetTgl()*GetTgl()) / (GetSigned1Pt()*GetSigned1Pt());
638 Double_t beta2 = p2 / (p2 + fMass*fMass);
639 if ((beta2 < 1.0e-10) ||
640 ((5940.0 * beta2/(1.0 - beta2 + 1.0e-10) - beta2) < 0.0)) {
644 Double_t dE = 0.153e-3 / beta2
645 * (TMath::Log(5940.0 * beta2/(1.0 - beta2 + 1.0e-10)) - beta2)
650 // Suspicious part - think about it ?
651 Double_t kinE = TMath::Sqrt(p2);
652 if (dE > 0.8*kinE) dE = 0.8 * kinE; //
653 if (dE < 0) dE = 0.0; // Not valid region for Bethe bloch
660 Double_t sigmade = 0.07 * TMath::Sqrt(TMath::Abs(dE)); // Energy loss fluctuation
661 Double_t sigmac2 = sigmade*sigmade*fC*fC*(p2+fMass*fMass)/(p2*p2);
663 fCee += fX*fX * sigmac2;
671 //_____________________________________________________________________________
672 Int_t AliTRDtrackV1::PropagateToR(Double_t r,Double_t step)
675 // Propagate track to the radial position
676 // Rotation always connected to the last track position
684 Double_t radius = TMath::Sqrt(GetX()*GetX() + GetY()*GetY());
686 Double_t dir = (radius > r) ? -1.0 : 1.0;
688 for (Double_t x = radius+dir*step; dir*x < dir*r; x += dir*step) {
691 Double_t alpha = TMath::ATan2(xyz0[1],xyz0[0]);
694 if(GetProlongation(x,y,z)<0) return -1;
695 xyz1[0] = x * TMath::Cos(alpha) + y * TMath::Sin(alpha);
696 xyz1[1] = x * TMath::Sin(alpha) - y * TMath::Cos(alpha);
699 if(AliTracker::MeanMaterialBudget(xyz0,xyz1,param)<=0.) return -1;
701 param[1] = 100000000;
703 PropagateTo(x,param[1],param[0]*param[4]);
708 Double_t alpha = TMath::ATan2(xyz0[1],xyz0[0]);
711 if(GetProlongation(r,y,z)<0) return -1;
712 xyz1[0] = r * TMath::Cos(alpha) + y * TMath::Sin(alpha);
713 xyz1[1] = r * TMath::Sin(alpha) - y * TMath::Cos(alpha);
716 if(AliTracker::MeanMaterialBudget(xyz0,xyz1,param) <= 0.) return -1;
719 param[1] = 100000000;
721 PropagateTo(r,param[1],param[0]*param[4]);
727 //_____________________________________________________________________________
728 void AliTRDtrackV1::Print(Option_t *o) const
730 // Print track status
731 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]));
732 AliInfo(Form("Material[%5.2f %5.2f %5.2f]", fBudget[0], fBudget[1], fBudget[2]));
734 AliInfo(Form("x[%7.2f] t[%7.4f] alpha[%f] mass[%f]", GetX(), GetIntegratedLength(), GetAlpha(), fMass));
735 AliInfo(Form("Ntr[%1d] NtrPID[%1d] Ncl[%3d] lab[%3d]", GetNumberOfTracklets(), GetNumberOfTrackletsPID(), fN, fLab));
738 const Double_t *curP = GetParameter();
739 for (Int_t i = 0; i < 5; i++) printf("%7.2f ", curP[i]);
743 const Double_t *curC = GetCovariance();
744 for (Int_t i = 0, j=4, k=0; i<15; i++, k++){
745 printf("%7.2f ", curC[i]);
751 if(strcmp(o, "a")!=0) return;
753 for(Int_t ip=0; ip<kNplane; ip++){
754 if(!fTracklet[ip]) continue;
755 fTracklet[ip]->Print(o);
760 //_____________________________________________________________________________
761 Bool_t AliTRDtrackV1::Rotate(Double_t alpha, Bool_t absolute)
764 // Rotates track parameters in R*phi plane
765 // if absolute rotation alpha is in global system
766 // otherwise alpha rotation is relative to the current rotation angle
769 if (absolute) alpha -= GetAlpha();
772 return AliExternalTrackParam::Rotate(GetAlpha()+alpha);
775 //___________________________________________________________
776 void AliTRDtrackV1::SetNumberOfClusters()
778 // Calculate the number of clusters attached to this track
781 for(int ip=0; ip<kNplane; ip++){
782 if(fTracklet[ip] && fTrackletIndex[ip] >= 0) ncls += fTracklet[ip]->GetN();
784 AliKalmanTrack::SetNumberOfClusters(ncls);
788 //_______________________________________________________________
789 void AliTRDtrackV1::SetOwner()
792 // Toggle ownership of tracklets
795 if(TestBit(kOwner)) return;
796 for (Int_t ip = 0; ip < kNplane; ip++) {
797 if(fTrackletIndex[ip]<0 || !fTracklet[ip]) continue;
798 fTracklet[ip] = new AliTRDseedV1(*fTracklet[ip]);
799 fTracklet[ip]->SetOwner();
804 //_______________________________________________________________
805 void AliTRDtrackV1::SetTracklet(AliTRDseedV1 *const trklt, Int_t index)
810 Int_t plane = trklt->GetPlane();
812 fTracklet[plane] = trklt;
813 fTrackletIndex[plane] = index;
816 //_______________________________________________________________
817 void AliTRDtrackV1::SetTrackIn()
819 // Save location of birth for the TRD track
820 // If the pointer is not valid allocate memory
822 const AliExternalTrackParam *op = dynamic_cast<const AliExternalTrackParam*>(this);
824 //printf("SetTrackIn() : fTrackLow[%p]\n", (void*)fTrackLow);
826 fTrackLow->~AliExternalTrackParam();
827 new(fTrackLow) AliExternalTrackParam(*op);
828 } else fTrackLow = new AliExternalTrackParam(*op);
831 //_______________________________________________________________
832 void AliTRDtrackV1::SetTrackOut(const AliExternalTrackParam *op)
834 // Save location of death for the TRD track
835 // If the pointer is not valid allocate memory
837 if(!op) op = dynamic_cast<const AliExternalTrackParam*>(this);
839 fTrackHigh->~AliExternalTrackParam();
840 new(fTrackHigh) AliExternalTrackParam(*op);
841 } else fTrackHigh = new AliExternalTrackParam(*op);
844 //_______________________________________________________________
845 void AliTRDtrackV1::UnsetTracklet(Int_t plane)
848 fTrackletIndex[plane] = -1;
849 fTracklet[plane] = NULL;
853 //_______________________________________________________________
854 void AliTRDtrackV1::UpdateChi2(Float_t chi2)
856 // Update chi2/track with one tracklet contribution
857 SetChi2(GetChi2() + chi2);
860 //_______________________________________________________________
861 void AliTRDtrackV1::UpdateESDtrack(AliESDtrack *track)
864 // Update the TRD PID information in the ESD track
867 // Int_t nslices = AliTRDcalibDB::Instance()->GetPIDResponse(fkReconstructor->GetRecoParam()->GetPIDmethod())->GetNumberOfSlices();
868 // number of tracklets used for PID calculation
869 UChar_t nPID = GetNumberOfTrackletsPID();
870 // number of tracklets attached to the track
871 UChar_t nTrk = GetNumberOfTracklets();
872 // pack the two numbers together and store them in the ESD
873 track->SetTRDntracklets(nPID | (nTrk<<3));
874 // allocate space to store raw PID signals dEdx & momentum
875 track->SetNumberOfTRDslices((AliTRDPIDResponse::kNslicesNN+3)*AliTRDgeometry::kNlayer);
877 Float_t p, sp; Double_t spd;
878 for (Int_t ip = 0; ip < kNplane; ip++) {
879 if(fTrackletIndex[ip]<0 || !fTracklet[ip]) continue;
880 if(!fTracklet[ip]->HasPID()) continue;
881 fTracklet[ip]->CookdEdx(AliTRDPIDResponse::kNslicesNN);
882 const Float_t *dedx = fTracklet[ip]->GetdEdx();
883 for (Int_t js = 0; js < AliTRDPIDResponse::kNslicesNN; js++, dedx++){
884 track->SetTRDslice(*dedx, ip, js+1);
886 p = fTracklet[ip]->GetMomentum(&sp);
887 spd = sp; track->SetTRDmomentum(p, ip, &spd);
888 // store global quality per tracklet instead of momentum error
889 // 26.09.11 A.Bercuci
890 // first implementation store no. of time bins filled in tracklet (5bits see "y" bits) and
891 // no. of double clusters in case of pad row cross (4bits see "x" bits)
892 // bit map for tracklet quality xxxxyyyyy
893 // 27.10.11 A.Bercuci
894 // add chamber status bit "z" bit
895 // bit map for tracklet quality zxxxxyyyyy
896 // 12.11.11 A.Bercuci
897 // fit tracklet quality into the field fTRDTimeBin [Char_t]
898 // bit map for tracklet quality zxxyyyyy
899 // The information should be retrieved by the following functions of AliESDtrack for each TRD layer
900 // GetTRDtrkltOccupancy(layer) -> no of TB filled in tracklet
901 // GetTRDtrkltClCross(layer) -> no of TB filled in crossing pad rows
902 // IsTRDtrkltChmbGood(layer) -> status of the chamber from which the tracklet is found
903 Int_t nCross(fTracklet[ip]->IsRowCross()?fTracklet[ip]->GetTBcross():0); if(nCross>3) nCross = 3;
904 Char_t trackletQ = Char_t(fTracklet[ip]->GetTBoccupancy() | (nCross<<5) | (fTracklet[ip]->IsChmbGood()<<7));
905 track->SetTRDTimBin(trackletQ, ip);
906 track->SetTRDslice(fTracklet[ip]->GetdQdl(), ip, 0); // Set Summed dEdx into the first slice
908 // store PID probabilities
909 track->SetTRDpid(fPID);