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 **************************************************************************/
21 #include "AliESDtrack.h"
22 #include "AliTracker.h"
24 #include "AliTRDtrackV1.h"
25 #include "AliTRDcluster.h"
26 #include "AliTRDcalibDB.h"
27 #include "AliTRDReconstructor.h"
28 #include "AliTRDPIDResponse.h"
29 #include "AliTRDrecoParam.h"
30 #include "AliTRDdEdxUtils.h"
32 ClassImp(AliTRDtrackV1)
34 ///////////////////////////////////////////////////////////////////////////////
36 // Represents a reconstructed TRD track //
37 // Local TRD Kalman track //
40 // Alex Bercuci <A.Bercuci@gsi.de> //
41 // Markus Fasel <M.Fasel@gsi.de> //
43 ///////////////////////////////////////////////////////////////////////////////
45 //_______________________________________________________________
46 AliTRDtrackV1::AliTRDtrackV1() : AliKalmanTrack()
51 ,fkReconstructor(NULL)
57 // Default constructor
59 //printf("AliTRDtrackV1::AliTRDtrackV1()\n");
61 for(int i =0; i<3; i++) fBudget[i] = 0.;
63 Float_t pid = 1./AliPID::kSPECIES;
64 for(int is =0; is<AliPID::kSPECIES; is++) fPID[is] = pid;
66 for(int ip=0; ip<kNplane; ip++){
67 fTrackletIndex[ip] = -1;
72 //_______________________________________________________________
73 AliTRDtrackV1::AliTRDtrackV1(const AliTRDtrackV1 &ref) : AliKalmanTrack(ref)
77 ,fTruncatedMean(ref.fTruncatedMean)
78 ,fkReconstructor(ref.fkReconstructor)
87 //printf("AliTRDtrackV1::AliTRDtrackV1(const AliTRDtrackV1 &)\n");
88 SetBit(kOwner, kFALSE);
89 for(int ip=0; ip<kNplane; ip++){
90 fTrackletIndex[ip] = ref.fTrackletIndex[ip];
91 fTracklet[ip] = ref.fTracklet[ip];
93 if(ref.fTrackLow) fTrackLow = new AliExternalTrackParam(*ref.fTrackLow);
94 if(ref.fTrackHigh) fTrackHigh = new AliExternalTrackParam(*ref.fTrackHigh);
96 for (Int_t i = 0; i < 3;i++) fBudget[i] = ref.fBudget[i];
98 for(Int_t is = 0; is<AliPID::kSPECIES; is++) fPID[is] = ref.fPID[is];
100 AliKalmanTrack::SetNumberOfClusters(ref.GetNumberOfClusters());
103 //_______________________________________________________________
104 AliTRDtrackV1::AliTRDtrackV1(const AliESDtrack &t) : AliKalmanTrack()
109 ,fkReconstructor(NULL)
115 // Constructor from AliESDtrack
119 SetLabel(t.GetLabel());
122 SetMass(t.GetMass(kTRUE));
123 AliKalmanTrack::SetNumberOfClusters(t.GetTRDncls());
124 Int_t ti[]={-1, -1, -1, -1, -1, -1}; t.GetTRDtracklets(&ti[0]);
125 for(int ip=0; ip<kNplane; ip++){
126 fTrackletIndex[ip] = ti[ip];
127 fTracklet[ip] = NULL;
129 for(int i =0; i<3; i++) fBudget[i] = 0.;
131 Float_t pid = 1./AliPID::kSPECIES;
132 for(int is =0; is<AliPID::kSPECIES; is++) fPID[is] = pid;
134 const AliExternalTrackParam *par = &t;
135 if (t.GetStatus() & AliESDtrack::kTRDbackup) {
136 par = t.GetOuterParam();
138 AliError("No backup info!");
145 ,par->GetCovariance());
147 if(t.GetStatus() & AliESDtrack::kTIME) {
150 t.GetIntegratedTimes(times);
151 SetIntegratedTimes(times);
152 SetIntegratedLength(t.GetIntegratedLength());
156 //_______________________________________________________________
157 AliTRDtrackV1::AliTRDtrackV1(AliTRDseedV1 * const trklts, const Double_t p[5], const Double_t cov[15]
158 , Double_t x, Double_t alpha) : AliKalmanTrack()
163 ,fkReconstructor(NULL)
169 // The stand alone tracking constructor
170 // TEMPORARY !!!!!!!!!!!
172 // 1. covariance matrix
173 // 2. dQdl calculation
177 Double_t cnv = (TMath::Abs(b) < 1.e-5) ? 1.e5 : 1./GetBz()/kB2C;
179 Double_t pp[5] = { p[0]
185 Double_t c22 = x*x*cov[14] - 2*x*cov[12] + cov[ 5];
186 Double_t c32 = x*cov[13] - cov[ 8];
187 Double_t c20 = x*cov[10] - cov[ 3];
188 Double_t c21 = x*cov[11] - cov[ 4];
189 Double_t c42 = x*cov[14] - cov[12];
191 Double_t cc[15] = { cov[ 0]
194 , cov[ 6], cov[ 7], c32, cov[ 9]
195 , cov[10]*cnv, cov[11]*cnv, c42*cnv, cov[13]*cnv, cov[14]*cnv*cnv };
197 Double_t mostProbablePt=AliExternalTrackParam::GetMostProbablePt();
198 Double_t p0=TMath::Sign(1/mostProbablePt,pp[4]);
199 Double_t w0=cc[14]/(cc[14] + p0*p0), w1=p0*p0/(cc[14] + p0*p0);
200 AliDebug(3, Form("Pt mixing : w0[%4.2f] pt0[%5.3f] w1[%4.2f] pt[%5.3f]", w0, 1./p0, w1, 1./pp[4]));
202 pp[4] = w0*p0 + w1*pp[4];
203 cc[10]*=w1; cc[11]*=w1; cc[12]*=w1; cc[13]*=w1; cc[14]*=w1;
205 AliDebug(2, Form("Init @ x[%6.2f] pt[%5.3f]", x, 1./pp[4]));
207 for(int iplane=0; iplane<kNplane; iplane++){
208 fTrackletIndex[iplane] = -1;
209 if(!trklts[iplane].IsOK()) fTracklet[iplane] = NULL;
211 fTracklet[iplane] = &trklts[iplane];
212 ncls += fTracklet[iplane]->GetN();
215 AliKalmanTrack::SetNumberOfClusters(ncls);
216 for(int i =0; i<3; i++) fBudget[i] = 0.;
218 Float_t pid = 1./AliPID::kSPECIES;
219 for(int is =0; is<AliPID::kSPECIES; is++) fPID[is] = pid;
222 //_______________________________________________________________
223 AliTRDtrackV1::~AliTRDtrackV1()
225 // Clean up all objects allocated by the track during its lifetime.
226 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'));
228 if(fBackupTrack) delete fBackupTrack; fBackupTrack = NULL;
230 if(fTrackLow) delete fTrackLow; fTrackLow = NULL;
231 if(fTrackHigh) delete fTrackHigh; fTrackHigh = NULL;
233 for(Int_t ip=0; ip<kNplane; ip++){
234 if(TestBit(kOwner) && fTracklet[ip]) delete fTracklet[ip];
235 fTracklet[ip] = NULL;
236 fTrackletIndex[ip] = -1;
240 //_______________________________________________________________
241 AliTRDtrackV1 &AliTRDtrackV1::operator=(const AliTRDtrackV1 &t)
244 // Assignment operator
248 AliKalmanTrack::operator=(t);
249 ((AliTRDtrackV1 &) t).Copy(*this);
256 //_____________________________________________________________________________
257 void AliTRDtrackV1::Copy(TObject &t) const
263 ((AliTRDtrackV1 &) t).fStatus = fStatus;
264 ((AliTRDtrackV1 &) t).fESDid = fESDid;
265 ((AliTRDtrackV1 &) t).fDE = fDE;
266 ((AliTRDtrackV1 &) t).fkReconstructor = fkReconstructor;
267 ((AliTRDtrackV1 &) t).fBackupTrack = 0x0;
268 ((AliTRDtrackV1 &) t).fTrackLow = 0x0;
269 ((AliTRDtrackV1 &) t).fTrackHigh = 0x0;
271 for(Int_t ip = 0; ip < kNplane; ip++) {
272 ((AliTRDtrackV1 &) t).fTrackletIndex[ip] = fTrackletIndex[ip];
273 ((AliTRDtrackV1 &) t).fTracklet[ip] = fTracklet[ip];
276 ((AliTRDtrackV1 &) t).fTrackLow = new AliExternalTrackParam(*fTrackLow);
279 ((AliTRDtrackV1 &) t).fTrackHigh = new AliExternalTrackParam(*fTrackHigh);
282 for (Int_t i = 0; i < 3; i++) {
283 ((AliTRDtrackV1 &) t).fBudget[i] = fBudget[i];
285 for (Int_t is = 0; is < AliPID::kSPECIES; is++) {
286 ((AliTRDtrackV1 &) t).fPID[is] = fPID[is];
291 //_______________________________________________________________
292 Int_t AliTRDtrackV1::CookLabel(Float_t wrong, Int_t *labs, Float_t *freq)
294 // Set MC label for this track
295 // On demand i.e. if arrays "labs" and "freq" are allocated by user returns :
296 // nlabs = the no of distinct labels
297 // labs = array of distinct labels in decreasing order of frequency
298 // freq = frequency of each label in decreasing order
301 if(!(ncl = GetNumberOfClusters())) return 0;
303 Int_t s[2][kMAXCLUSTERSPERTRACK];
304 for (Int_t i = 0; i < kMAXCLUSTERSPERTRACK; i++) {
309 Int_t label(-123456789), nlabels(0);
310 AliTRDcluster *c(NULL);
311 for (Int_t ip(0); ip < AliTRDgeometry::kNlayer; ip++) {
312 if(fTrackletIndex[ip]<0 || !fTracklet[ip]) continue;
313 for (Int_t ic(0); ic < AliTRDseedV1::kNclusters; ic++) {
314 if(!(c = fTracklet[ip]->GetClusters(ic))) continue;
315 for (Int_t k(0); k < 3; k++) {
316 if ((label = c->GetLabel(k)) < 0) continue;
318 while(j < kMAXCLUSTERSPERTRACK){
319 if(s[0][j]!=label && s[1][j]!=0){j++; continue;}
320 if(!s[1][j]) nlabels++;
321 s[0][j] = label; s[1][j]++;
327 //printf(" Found %4d labels\n", nlabels);
330 AliError(Form("No MC labels found for track %d.", fESDid));
332 } else if(nlabels==1) {
334 if(labs && freq){labs[0]=label; freq[0]=1.;}
336 Int_t idx[kMAXCLUSTERSPERTRACK];
337 TMath::Sort(nlabels, s[1], idx);
338 label = s[0][idx[0]]; prob = s[1][idx[0]]/Float_t(ncl);
340 for (Int_t i(0); i<nlabels; i++){
341 labs[i] = s[0][idx[i]];
342 freq[i] = s[1][idx[i]]/Float_t(ncl);
346 SetLabel((1.-prob > wrong)?-label:label);
350 //_______________________________________________________________
351 Bool_t AliTRDtrackV1::CookPID()
354 // Cook the PID information for the track by delegating the omonim function of the tracklets.
355 // Computes the number of tracklets used. The tracklet information are considered independent.
356 // For the moment no global track measurement of PID is performed as for example to estimate
357 // bremsstrahlung probability based on global chi2 of the track.
359 // The status bit AliESDtrack::kTRDpid is set during the call of AliTRDtrackV1::UpdateESDtrack().The PID performance of the
360 //TRD for tracks with 6 tacklets is displayed below.
362 //<img src="TRD/trackPID.gif">
365 const AliTRDPIDResponse *pidResponse = AliTRDcalibDB::Instance()->GetPIDResponse(fkReconstructor->GetRecoParam()->GetPIDmethod());
367 AliError("PID Response not available");
370 Int_t nslices = pidResponse->GetNumberOfSlices();
371 Double_t dEdx[kNplane * (Int_t)AliTRDPIDResponse::kNslicesNN];
372 Float_t trackletP[kNplane];
373 memset(dEdx, 0, sizeof(Double_t) * kNplane * (Int_t)AliTRDPIDResponse::kNslicesNN);
374 memset(trackletP, 0, sizeof(Float_t)*kNplane);
375 for(Int_t iseed = 0; iseed < kNplane; iseed++){
376 if(!fTracklet[iseed]) continue;
377 trackletP[iseed] = fTracklet[iseed]->GetMomentum();
378 fTracklet[iseed]->SetPID();
379 if(pidResponse->GetPIDmethod() == AliTRDPIDResponse::kLQ1D){
380 dEdx[iseed] = fTracklet[iseed]->GetdQdl();
382 fTracklet[iseed]->CookdEdx(nslices);
383 const Float_t *trackletdEdx = fTracklet[iseed]->GetdEdx();
384 for(Int_t islice = 0; islice < nslices; islice++){
385 dEdx[iseed*nslices + islice] = trackletdEdx[islice];
389 pidResponse->GetResponse(nslices, dEdx, trackletP, fPID);
391 static Int_t nprint = 0;
393 AliTRDdEdxUtils::PrintControl();
398 AliTRDdEdxUtils::SetObjPHQ(AliTRDcalibDB::Instance()->GetPHQ());
399 const Double_t mag = AliTRDdEdxUtils::IsExBOn() ? GetBz() : -1;
400 const Double_t charge = AliTRDdEdxUtils::IsExBOn() ? Charge() : -1;
401 fTruncatedMean = CookTruncatedMean(0, mag, charge, kTRUE);
406 //___________________________________________________________
407 UChar_t AliTRDtrackV1::GetNumberOfTrackletsPID() const
409 // Retrieve number of tracklets used for PID calculation.
412 for(int ip=0; ip<kNplane; ip++){
413 if(fTrackletIndex[ip]<0 || !fTracklet[ip]) continue;
414 if(!fTracklet[ip]->IsOK()) continue;
421 //_______________________________________________________________
422 AliTRDcluster* AliTRDtrackV1::GetCluster(Int_t id)
424 // Get the cluster at a certain position in the track
426 for(Int_t ip=0; ip<kNplane; ip++){
427 if(!fTracklet[ip]) continue;
428 if(n+fTracklet[ip]->GetN() <= id){
429 n+=fTracklet[ip]->GetN();
432 AliTRDcluster *c = NULL;
433 for(Int_t ic=AliTRDseedV1::kNclusters; ic--;){
434 if(!(c = fTracklet[ip]->GetClusters(ic))) continue;
436 if(n<id){n++; continue;}
443 //_______________________________________________________________
444 Int_t AliTRDtrackV1::GetClusterIndex(Int_t id) const
446 // Get the cluster index at a certain position in the track
448 for(Int_t ip=0; ip<kNplane; ip++){
449 if(!fTracklet[ip]) continue;
450 if(n+fTracklet[ip]->GetN() <= id){
451 n+=fTracklet[ip]->GetN();
454 for(Int_t ic=AliTRDseedV1::kNclusters; ic--;){
455 if(!(fTracklet[ip]->GetClusters(ic))) continue;
456 if(n<id){n++; continue;}
457 return fTracklet[ip]->GetIndexes(ic);
463 //_______________________________________________________________
464 Double_t AliTRDtrackV1::GetPredictedChi2(const AliTRDseedV1 *trklt, Double_t *cov) const
466 // Compute chi2 between tracklet and track. The value is calculated at the radial position of the track
467 // equal to the reference radial position of the tracklet (see AliTRDseedV1)
469 // The chi2 estimator is computed according to the following formula
471 // #chi^{2}=(X_{trklt}-X_{track})(C_{trklt}+C_{track})^{-1}(X_{trklt}-X_{track})^{T}
473 // where X=(y z), the position of the track/tracklet in the yz plane
476 Double_t p[2] = { trklt->GetY(), trklt->GetZ()};
477 trklt->GetCovAt(trklt->GetX(), cov);
478 return AliExternalTrackParam::GetPredictedChi2(p, cov);
481 //_______________________________________________________________
482 Int_t AliTRDtrackV1::GetSector() const
484 return Int_t(GetAlpha()/AliTRDgeometry::GetAlpha() + (GetAlpha()>0. ? 0 : AliTRDgeometry::kNsector));
487 //_______________________________________________________________
488 Bool_t AliTRDtrackV1::IsEqual(const TObject *o) const
490 // Checks whether two tracks are equal
491 if (!o) return kFALSE;
492 const AliTRDtrackV1 *inTrack = dynamic_cast<const AliTRDtrackV1*>(o);
493 if (!inTrack) return kFALSE;
495 //if ( fPIDquality != inTrack->GetPIDquality() ) return kFALSE;
497 if(memcmp(fPID, inTrack->fPID, AliPID::kSPECIES*sizeof(Double32_t))) return kFALSE;
498 if(memcmp(fBudget, inTrack->fBudget, 3*sizeof(Double32_t))) return kFALSE;
499 if(memcmp(&fDE, &inTrack->fDE, sizeof(Double32_t))) return kFALSE;
500 if(memcmp(&fFakeRatio, &inTrack->fFakeRatio, sizeof(Double32_t))) return kFALSE;
501 if(memcmp(&fChi2, &inTrack->fChi2, sizeof(Double32_t))) return kFALSE;
502 if(memcmp(&fMass, &inTrack->fMass, sizeof(Double32_t))) return kFALSE;
503 if( fLab != inTrack->fLab ) return kFALSE;
504 if( fN != inTrack->fN ) return kFALSE;
505 Double32_t l(0.), in(0.);
506 l = GetIntegratedLength(); in = inTrack->GetIntegratedLength();
507 if(memcmp(&l, &in, sizeof(Double32_t))) return kFALSE;
508 l=GetX(); in=inTrack->GetX();
509 if(memcmp(&l, &in, sizeof(Double32_t))) return kFALSE;
510 l = GetAlpha(); in = inTrack->GetAlpha();
511 if(memcmp(&l, &in, sizeof(Double32_t))) return kFALSE;
512 if(memcmp(GetParameter(), inTrack->GetParameter(), 5*sizeof(Double32_t))) return kFALSE;
513 if(memcmp(GetCovariance(), inTrack->GetCovariance(), 15*sizeof(Double32_t))) return kFALSE;
515 for (Int_t iTracklet = 0; iTracklet < kNplane; iTracklet++){
516 AliTRDseedV1 *curTracklet = fTracklet[iTracklet];
517 AliTRDseedV1 *inTracklet = inTrack->GetTracklet(iTracklet);
518 if (curTracklet && inTracklet){
519 if (! curTracklet->IsEqual(inTracklet) ) {
520 curTracklet->Print();
525 // if one tracklet exists, and corresponding
526 // in other track doesn't - return kFALSE
527 if(inTracklet || curTracklet) return kFALSE;
534 //_______________________________________________________________
535 Bool_t AliTRDtrackV1::IsElectron() const
537 if(GetPID(0) > fkReconstructor->GetRecoParam()->GetPIDThreshold(GetP())) return kTRUE;
542 //_____________________________________________________________________________
543 Int_t AliTRDtrackV1::MakeBackupTrack()
546 // Creates a backup track
547 // TO DO update quality check of the track.
550 Float_t occupancy(0.); Int_t n(0), ncls(0);
551 for(Int_t il(AliTRDgeometry::kNlayer); il--;){
552 if(!fTracklet[il]) continue;
554 occupancy+=fTracklet[il]->GetTBoccupancy()/AliTRDseedV1::kNtb;
555 ncls += fTracklet[il]->GetN();
560 //Float_t ratio1 = Float_t(t.GetNumberOfClusters()+1) / Float_t(t.GetNExpected()+1);
562 Int_t failedCutId(0);
563 if(GetChi2()/n > 5.0) failedCutId=1;
564 if(occupancy < 0.7) failedCutId=2;
565 //if(ratio1 > 0.6) &&
566 //if(ratio0+ratio1 > 1.5) &&
567 if(GetNCross() != 0) failedCutId=3;
568 if(TMath::Abs(GetSnp()) > 0.85) failedCutId=4;
569 if(ncls < 20) failedCutId=5;
572 AliDebug(2, Form("\n"
573 "chi2/tracklet < 5.0 [%c] %5.2f\n"
574 "occupancy > 0.7 [%c] %4.2f\n"
575 "NCross == 0 [%c] %d\n"
576 "Abs(snp) < 0.85 [%c] %4.2f\n"
577 "NClusters > 20 [%c] %d"
578 ,(GetChi2()/n<5.0)?'y':'n', GetChi2()/n
579 ,(occupancy>0.7)?'y':'n', occupancy
580 ,(GetNCross()==0)?'y':'n', GetNCross()
581 ,(TMath::Abs(GetSnp())<0.85)?'y':'n', TMath::Abs(GetSnp())
582 ,(ncls>20)?'y':'n', ncls
588 fBackupTrack->~AliTRDtrackV1();
589 new(fBackupTrack) AliTRDtrackV1((AliTRDtrackV1&)(*this));
592 fBackupTrack = new AliTRDtrackV1((AliTRDtrackV1&)(*this));
596 //_____________________________________________________________________________
597 Int_t AliTRDtrackV1::GetProlongation(Double_t xk, Double_t &y, Double_t &z) const
600 // Find a prolongation at given x
601 // Return -1 if it does not exist
604 Double_t bz = GetBz();
605 if (!AliExternalTrackParam::GetYAt(xk,bz,y)) return -1;
606 if (!AliExternalTrackParam::GetZAt(xk,bz,z)) return -1;
612 //_____________________________________________________________________________
613 Bool_t AliTRDtrackV1::PropagateTo(Double_t xk, Double_t xx0, Double_t xrho)
616 // Propagates this track to a reference plane defined by "xk" [cm]
617 // correcting for the mean crossed material.
619 // "xx0" - thickness/rad.length [units of the radiation length]
620 // "xrho" - thickness*density [g/cm^2]
623 if (TMath::Abs(xk - GetX())<AliTRDReconstructor::GetEpsilon()*0.1) return kTRUE; // 10% of the tracker precision
625 Double_t xyz0[3] = {GetX(), GetY(), GetZ()}, // track position BEFORE propagation
626 b[3]; // magnetic field
628 if(!AliExternalTrackParam::PropagateToBxByBz(xk,b)) return kFALSE;
630 // local track position AFTER propagation
631 Double_t xyz1[3] = {GetX(), GetY(), GetZ()};
632 // 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));
635 if (IsStartedTimeIntegral()) {
636 Double_t l2 = TMath::Sqrt((xyz1[0]-xyz0[0])*(xyz1[0]-xyz0[0])
637 + (xyz1[1]-xyz0[1])*(xyz1[1]-xyz0[1])
638 + (xyz1[2]-xyz0[2])*(xyz1[2]-xyz0[2]));
639 Double_t crv = AliExternalTrackParam::GetC(b[2]);
640 if (TMath::Abs(l2*crv) > 0.0001) {
641 // Make correction for curvature if neccesary
642 l2 = 0.5 * TMath::Sqrt((xyz1[0]-xyz0[0])*(xyz1[0]-xyz0[0])
643 + (xyz1[1]-xyz0[1])*(xyz1[1]-xyz0[1]));
644 l2 = 2.0 * TMath::ASin(l2 * crv) / crv;
645 l2 = TMath::Sqrt(l2*l2 + (xyz1[2]-xyz0[2])*(xyz1[2]-xyz0[2]));
650 if (!AliExternalTrackParam::CorrectForMeanMaterial(xx0, xrho, fMass)) return kFALSE;
656 Double_t p2 = (1.0 + GetTgl()*GetTgl()) / (GetSigned1Pt()*GetSigned1Pt());
657 Double_t beta2 = p2 / (p2 + fMass*fMass);
658 if ((beta2 < 1.0e-10) ||
659 ((5940.0 * beta2/(1.0 - beta2 + 1.0e-10) - beta2) < 0.0)) {
663 Double_t dE = 0.153e-3 / beta2
664 * (TMath::Log(5940.0 * beta2/(1.0 - beta2 + 1.0e-10)) - beta2)
669 // Suspicious part - think about it ?
670 Double_t kinE = TMath::Sqrt(p2);
671 if (dE > 0.8*kinE) dE = 0.8 * kinE; //
672 if (dE < 0) dE = 0.0; // Not valid region for Bethe bloch
679 Double_t sigmade = 0.07 * TMath::Sqrt(TMath::Abs(dE)); // Energy loss fluctuation
680 Double_t sigmac2 = sigmade*sigmade*fC*fC*(p2+fMass*fMass)/(p2*p2);
682 fCee += fX*fX * sigmac2;
690 //_____________________________________________________________________________
691 Int_t AliTRDtrackV1::PropagateToR(Double_t r,Double_t step)
694 // Propagate track to the radial position
695 // Rotation always connected to the last track position
703 Double_t radius = TMath::Sqrt(GetX()*GetX() + GetY()*GetY());
705 Double_t dir = (radius > r) ? -1.0 : 1.0;
707 for (Double_t x = radius+dir*step; dir*x < dir*r; x += dir*step) {
710 Double_t alpha = TMath::ATan2(xyz0[1],xyz0[0]);
713 if(GetProlongation(x,y,z)<0) return -1;
714 xyz1[0] = x * TMath::Cos(alpha) + y * TMath::Sin(alpha);
715 xyz1[1] = x * TMath::Sin(alpha) - y * TMath::Cos(alpha);
718 if(AliTracker::MeanMaterialBudget(xyz0,xyz1,param)<=0.) return -1;
720 param[1] = 100000000;
722 PropagateTo(x,param[1],param[0]*param[4]);
727 Double_t alpha = TMath::ATan2(xyz0[1],xyz0[0]);
730 if(GetProlongation(r,y,z)<0) return -1;
731 xyz1[0] = r * TMath::Cos(alpha) + y * TMath::Sin(alpha);
732 xyz1[1] = r * TMath::Sin(alpha) - y * TMath::Cos(alpha);
735 if(AliTracker::MeanMaterialBudget(xyz0,xyz1,param) <= 0.) return -1;
738 param[1] = 100000000;
740 PropagateTo(r,param[1],param[0]*param[4]);
746 //_____________________________________________________________________________
747 void AliTRDtrackV1::Print(Option_t *o) const
749 // Print track status
750 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]));
751 AliInfo(Form("Material[%5.2f %5.2f %5.2f]", fBudget[0], fBudget[1], fBudget[2]));
753 AliInfo(Form("x[%7.2f] t[%7.4f] alpha[%f] mass[%f]", GetX(), GetIntegratedLength(), GetAlpha(), fMass));
754 AliInfo(Form("Ntr[%1d] NtrPID[%1d] Ncl[%3d] lab[%3d]", GetNumberOfTracklets(), GetNumberOfTrackletsPID(), fN, fLab));
757 const Double_t *curP = GetParameter();
758 for (Int_t i = 0; i < 5; i++) printf("%7.2f ", curP[i]);
762 const Double_t *curC = GetCovariance();
763 for (Int_t i = 0, j=4, k=0; i<15; i++, k++){
764 printf("%7.2f ", curC[i]);
770 if(strcmp(o, "a")!=0) return;
772 for(Int_t ip=0; ip<kNplane; ip++){
773 if(!fTracklet[ip]) continue;
774 fTracklet[ip]->Print(o);
779 //_____________________________________________________________________________
780 Bool_t AliTRDtrackV1::Rotate(Double_t alpha, Bool_t absolute)
783 // Rotates track parameters in R*phi plane
784 // if absolute rotation alpha is in global system
785 // otherwise alpha rotation is relative to the current rotation angle
788 if (absolute) alpha -= GetAlpha();
791 return AliExternalTrackParam::Rotate(GetAlpha()+alpha);
794 //___________________________________________________________
795 void AliTRDtrackV1::SetNumberOfClusters()
797 // Calculate the number of clusters attached to this track
800 for(int ip=0; ip<kNplane; ip++){
801 if(fTracklet[ip] && fTrackletIndex[ip] >= 0) ncls += fTracklet[ip]->GetN();
803 AliKalmanTrack::SetNumberOfClusters(ncls);
807 //_______________________________________________________________
808 void AliTRDtrackV1::SetOwner()
811 // Toggle ownership of tracklets
814 if(TestBit(kOwner)) return;
815 for (Int_t ip = 0; ip < kNplane; ip++) {
816 if(fTrackletIndex[ip]<0 || !fTracklet[ip]) continue;
817 fTracklet[ip] = new AliTRDseedV1(*fTracklet[ip]);
818 fTracklet[ip]->SetOwner();
823 //_______________________________________________________________
824 void AliTRDtrackV1::SetTracklet(AliTRDseedV1 *const trklt, Int_t index)
829 Int_t plane = trklt->GetPlane();
831 fTracklet[plane] = trklt;
832 fTrackletIndex[plane] = index;
835 //_______________________________________________________________
836 void AliTRDtrackV1::SetTrackIn()
838 // Save location of birth for the TRD track
839 // If the pointer is not valid allocate memory
841 const AliExternalTrackParam *op = dynamic_cast<const AliExternalTrackParam*>(this);
843 //printf("SetTrackIn() : fTrackLow[%p]\n", (void*)fTrackLow);
845 fTrackLow->~AliExternalTrackParam();
846 new(fTrackLow) AliExternalTrackParam(*op);
847 } else fTrackLow = new AliExternalTrackParam(*op);
850 //_______________________________________________________________
851 void AliTRDtrackV1::SetTrackOut(const AliExternalTrackParam *op)
853 // Save location of death for the TRD track
854 // If the pointer is not valid allocate memory
856 if(!op) op = dynamic_cast<const AliExternalTrackParam*>(this);
858 fTrackHigh->~AliExternalTrackParam();
859 new(fTrackHigh) AliExternalTrackParam(*op);
860 } else fTrackHigh = new AliExternalTrackParam(*op);
863 //_______________________________________________________________
864 void AliTRDtrackV1::UnsetTracklet(Int_t plane)
867 fTrackletIndex[plane] = -1;
868 fTracklet[plane] = NULL;
872 //_______________________________________________________________
873 void AliTRDtrackV1::UpdateChi2(Float_t chi2)
875 // Update chi2/track with one tracklet contribution
876 SetChi2(GetChi2() + chi2);
879 //_______________________________________________________________
880 void AliTRDtrackV1::UpdateESDtrack(AliESDtrack *track)
883 // Update the TRD PID information in the ESD track
886 // Int_t nslices = AliTRDcalibDB::Instance()->GetPIDResponse(fkReconstructor->GetRecoParam()->GetPIDmethod())->GetNumberOfSlices();
887 // number of tracklets used for PID calculation
888 UChar_t nPID = GetNumberOfTrackletsPID();
889 // number of tracklets attached to the track
890 UChar_t nTrk = GetNumberOfTracklets();
891 // pack the two numbers together and store them in the ESD
892 track->SetTRDntracklets(nPID | (nTrk<<3));
893 // allocate space to store raw PID signals dEdx & momentum
894 track->SetNumberOfTRDslices((AliTRDPIDResponse::kNslicesNN+3)*AliTRDgeometry::kNlayer);
896 Float_t p, sp; Double_t spd;
897 for (Int_t ip = 0; ip < kNplane; ip++) {
898 if(fTrackletIndex[ip]<0 || !fTracklet[ip]) continue;
899 if(!fTracklet[ip]->HasPID()) continue;
900 fTracklet[ip]->CookdEdx(AliTRDPIDResponse::kNslicesNN);
901 const Float_t *dedx = fTracklet[ip]->GetdEdx();
902 for (Int_t js = 0; js < AliTRDPIDResponse::kNslicesNN; js++, dedx++){
903 track->SetTRDslice(*dedx, ip, js+1);
905 p = fTracklet[ip]->GetMomentum(&sp);
906 spd = sp; track->SetTRDmomentum(p, ip, &spd);
907 // store global quality per tracklet instead of momentum error
908 // 26.09.11 A.Bercuci
909 // first implementation store no. of time bins filled in tracklet (5bits see "y" bits) and
910 // no. of double clusters in case of pad row cross (4bits see "x" bits)
911 // bit map for tracklet quality xxxxyyyyy
912 // 27.10.11 A.Bercuci
913 // add chamber status bit "z" bit
914 // bit map for tracklet quality zxxxxyyyyy
915 // 12.11.11 A.Bercuci
916 // fit tracklet quality into the field fTRDTimeBin [Char_t]
917 // bit map for tracklet quality zxxyyyyy
918 // The information should be retrieved by the following functions of AliESDtrack for each TRD layer
919 // GetTRDtrkltOccupancy(layer) -> no of TB filled in tracklet
920 // GetTRDtrkltClCross(layer) -> no of TB filled in crossing pad rows
921 // IsTRDtrkltChmbGood(layer) -> status of the chamber from which the tracklet is found
922 Int_t nCross(fTracklet[ip]->IsRowCross()?fTracklet[ip]->GetTBcross():0); if(nCross>3) nCross = 3;
923 Char_t trackletQ = Char_t(fTracklet[ip]->GetTBoccupancy() | (nCross<<5) | (fTracklet[ip]->IsChmbGood()<<7));
924 track->SetTRDTimBin(trackletQ, ip);
925 track->SetTRDslice(fTracklet[ip]->GetdQdl(), ip, 0); // Set Summed dEdx into the first slice
927 // store PID probabilities
928 track->SetTRDpid(fPID);
930 //store truncated mean
931 track->SetTRDsignal(fTruncatedMean);
934 //_______________________________________________________________
935 Double_t AliTRDtrackV1::CookTruncatedMean(const Bool_t kinvq, const Double_t mag, const Int_t charge, const Int_t kcalib, TVectorD *Qs, TVectorD *Xs, Int_t timeBin0, Int_t timeBin1, Int_t tstep) const
938 //Origin: Xianguo Lu <xianguo.lu@cern.ch>, Marian Ivanov <marian.ivanov@cern.ch>
941 TVectorD arrayQ(200), arrayX(200);
942 Int_t ncls = AliTRDdEdxUtils::GetArrayClusterQ(kinvq, &arrayQ, &arrayX, this, timeBin0, timeBin1, tstep);
944 const TObjArray *cobj = kcalib ? AliTRDdEdxUtils::GetObjPHQ(kinvq, mag, charge) : NULL;
946 const Double_t tmean = AliTRDdEdxUtils::ToyCook(kinvq, ncls, &arrayQ, &arrayX, cobj);
948 const Int_t nch = AliTRDdEdxUtils::UpdateArrayX(ncls, &arrayX);
955 return AliTRDdEdxUtils::GetSignal(nch, ncls, tmean);