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 **************************************************************************/
18 ///////////////////////////////////////////////////////////////////////////////
23 // Alex Bercuci <A.Bercuci@gsi.de> //
24 // Markus Fasel <M.Fasel@gsi.de> //
26 ///////////////////////////////////////////////////////////////////////////////
29 #include <TDirectory.h>
30 #include <TLinearFitter.h>
32 #include <TClonesArray.h>
33 #include <TTreeStream.h>
34 #include <TGeoMatrix.h>
35 #include <TGeoManager.h>
38 #include "AliMathBase.h"
39 #include "AliESDEvent.h"
40 #include "AliGeomManager.h"
41 #include "AliRieman.h"
42 #include "AliTrackPointArray.h"
44 #include "AliTRDgeometry.h"
45 #include "AliTRDpadPlane.h"
46 #include "AliTRDcalibDB.h"
47 #include "AliTRDReconstructor.h"
48 #include "AliTRDCalibraFillHisto.h"
49 #include "AliTRDrecoParam.h"
51 #include "AliTRDcluster.h"
52 #include "AliTRDdigitsParam.h"
53 #include "AliTRDseedV1.h"
54 #include "AliTRDtrackV1.h"
55 #include "AliTRDtrackerV1.h"
56 #include "AliTRDtrackerDebug.h"
57 #include "AliTRDtrackingChamber.h"
58 #include "AliTRDchamberTimeBin.h"
60 ClassImp(AliTRDtrackerV1)
61 ClassImp(AliTRDtrackerV1::AliTRDLeastSquare)
62 ClassImp(AliTRDtrackerV1::AliTRDtrackFitterRieman)
64 AliTRDtrackerV1::ETRDtrackerV1BetheBloch AliTRDtrackerV1::fgBB = AliTRDtrackerV1::kGeant;
65 Double_t AliTRDtrackerV1::fgTopologicQA[kNConfigs] = {
66 0.5112, 0.5112, 0.5112, 0.0786, 0.0786,
67 0.0786, 0.0786, 0.0579, 0.0579, 0.0474,
68 0.0474, 0.0408, 0.0335, 0.0335, 0.0335
70 const Double_t AliTRDtrackerV1::fgkX0[kNPlanes] = {
71 300.2, 312.8, 325.4, 338.0, 350.6, 363.2};
72 // Number of Time Bins/chamber should be also stored independently by the traker
73 // (also in AliTRDReconstructor) in oder to be able to run HLT. Fix TODO
74 Int_t AliTRDtrackerV1::fgNTimeBins = 0;
75 AliRieman* AliTRDtrackerV1::fgRieman = NULL;
76 TLinearFitter* AliTRDtrackerV1::fgTiltedRieman = NULL;
77 TLinearFitter* AliTRDtrackerV1::fgTiltedRiemanConstrained = NULL;
79 //____________________________________________________________________
80 AliTRDtrackerV1::AliTRDtrackerV1(const AliTRDReconstructor *rec)
82 ,fkReconstructor(NULL)
93 // Default constructor.
96 SetReconstructor(rec); // initialize reconstructor
98 // initialize geometry
99 if(!AliGeomManager::GetGeometry()){
100 AliFatal("Could not get geometry.");
102 fGeom = new AliTRDgeometry();
103 fGeom->CreateClusterMatrixArray();
104 TGeoHMatrix *matrix = NULL;
105 Double_t loc[] = {0., 0., 0.};
106 Double_t glb[] = {0., 0., 0.};
107 for(Int_t ily=kNPlanes; ily--;){
109 while(!(matrix = fGeom->GetClusterMatrix(AliTRDgeometry::GetDetector(ily, 2, ism)))) ism++;
111 AliError(Form("Could not get transformation matrix for layer %d. Use default.", ily));
112 fR[ily] = fgkX0[ily];
115 matrix->LocalToMaster(loc, glb);
116 fR[ily] = glb[0]+ AliTRDgeometry::AnodePos()-.5*AliTRDgeometry::AmThick() - AliTRDgeometry::DrThick();
119 // initialize cluster containers
120 for (Int_t isector = 0; isector < AliTRDgeometry::kNsector; isector++) new(&fTrSec[isector]) AliTRDtrackingSector(fGeom, isector);
123 memset(fTrackQuality, 0, kMaxTracksStack*sizeof(Double_t));
124 memset(fSeedLayer, 0, kMaxTracksStack*sizeof(Int_t));
125 memset(fSeedTB, 0, kNSeedPlanes*sizeof(AliTRDchamberTimeBin*));
126 fTracksESD = new TClonesArray("AliESDtrack", 2*kMaxTracksStack);
127 fTracksESD->SetOwner();
130 //____________________________________________________________________
131 AliTRDtrackerV1::~AliTRDtrackerV1()
137 if(fgRieman) delete fgRieman; fgRieman = NULL;
138 if(fgTiltedRieman) delete fgTiltedRieman; fgTiltedRieman = NULL;
139 if(fgTiltedRiemanConstrained) delete fgTiltedRiemanConstrained; fgTiltedRiemanConstrained = NULL;
140 for(Int_t isl =0; isl<kNSeedPlanes; isl++) if(fSeedTB[isl]) delete fSeedTB[isl];
141 if(fTracksESD){ fTracksESD->Delete(); delete fTracksESD; }
142 if(fTracks) {fTracks->Delete(); delete fTracks;}
143 if(fTracklets) {fTracklets->Delete(); delete fTracklets;}
144 if(IsClustersOwner() && fClusters) {
145 AliInfo(Form("tracker[%p] removing %d own clusters @ %p", (void*)this, fClusters->GetEntries(), (void*)fClusters));
146 fClusters->Delete(); delete fClusters;
148 if(fGeom) delete fGeom;
151 //____________________________________________________________________
152 Int_t AliTRDtrackerV1::Clusters2Tracks(AliESDEvent *esd)
155 // Steering stand alone tracking for full TRD detector
158 // esd : The ESD event. On output it contains
159 // the ESD tracks found in TRD.
162 // Number of tracks found in the TRD detector.
164 // Detailed description
165 // 1. Launch individual SM trackers.
166 // See AliTRDtrackerV1::Clusters2TracksSM() for details.
170 AliError("Reconstruction configuration not initialized. Call first AliTRDReconstructor::SetRecoParam().");
174 //AliInfo("Start Track Finder ...");
176 for(int ism=0; ism<AliTRDgeometry::kNsector; ism++){
177 // for(int ism=1; ism<2; ism++){
178 //AliInfo(Form("Processing supermodule %i ...", ism));
179 ntracks += Clusters2TracksSM(ism, esd);
181 AliInfo(Form("Number of tracks: !TRDin[%d]", ntracks));
186 //_____________________________________________________________________________
187 Bool_t AliTRDtrackerV1::GetTrackPoint(Int_t index, AliTrackPoint &p) const
189 //AliInfo(Form("Asking for tracklet %d", index));
191 // reset position of the point before using it
192 p.SetXYZ(0., 0., 0.);
193 AliTRDseedV1 *tracklet = GetTracklet(index);
194 if (!tracklet) return kFALSE;
196 // get detector for this tracklet
197 Int_t det = tracklet->GetDetector();
198 Int_t sec = fGeom->GetSector(det);
199 Double_t alpha = (sec+.5)*AliTRDgeometry::GetAlpha(),
200 sinA = TMath::Sin(alpha),
201 cosA = TMath::Cos(alpha);
203 local[0] = tracklet->GetX();
204 local[1] = tracklet->GetY();
205 local[2] = tracklet->GetZ();
207 fGeom->RotateBack(det, local, global);
209 Double_t cov2D[3]; Float_t cov[6];
210 tracklet->GetCovAt(local[0], cov2D);
211 cov[0] = cov2D[0]*sinA*sinA;
212 cov[1] =-cov2D[0]*sinA*cosA;
213 cov[2] =-cov2D[1]*sinA;
214 cov[3] = cov2D[0]*cosA*cosA;
215 cov[4] = cov2D[1]*cosA;
217 // store the global position of the tracklet and its covariance matrix in the track point
218 p.SetXYZ(global[0],global[1],global[2], cov);
221 AliGeomManager::ELayerID iLayer = AliGeomManager::ELayerID(AliGeomManager::kTRD1+fGeom->GetLayer(det));
222 Int_t modId = fGeom->GetSector(det) * AliTRDgeometry::kNstack + fGeom->GetStack(det);
223 UShort_t volid = AliGeomManager::LayerToVolUID(iLayer, modId);
224 p.SetVolumeID(volid);
229 //____________________________________________________________________
230 TLinearFitter* AliTRDtrackerV1::GetTiltedRiemanFitter()
232 if(!fgTiltedRieman) fgTiltedRieman = new TLinearFitter(4, "hyp4");
233 return fgTiltedRieman;
236 //____________________________________________________________________
237 TLinearFitter* AliTRDtrackerV1::GetTiltedRiemanFitterConstraint()
239 if(!fgTiltedRiemanConstrained) fgTiltedRiemanConstrained = new TLinearFitter(2, "hyp2");
240 return fgTiltedRiemanConstrained;
243 //____________________________________________________________________
244 AliRieman* AliTRDtrackerV1::GetRiemanFitter()
246 if(!fgRieman) fgRieman = new AliRieman(AliTRDseedV1::kNtb * AliTRDgeometry::kNlayer);
250 //_____________________________________________________________________________
251 Int_t AliTRDtrackerV1::PropagateBack(AliESDEvent *event)
253 // Propagation of ESD tracks from TPC to TOF detectors and building of the TRD track. For building
254 // a TRD track an ESD track is used as seed. The informations obtained on the TRD track (measured points,
255 // covariance, PID, etc.) are than used to update the corresponding ESD track.
256 // Each track seed is first propagated to the geometrical limit of the TRD detector.
257 // Its prolongation is searched in the TRD and if corresponding clusters are found tracklets are
258 // constructed out of them (see AliTRDseedV1::AttachClusters()) and the track is updated.
259 // Otherwise the ESD track is left unchanged.
261 // The following steps are performed:
262 // 1. Selection of tracks based on the variance in the y-z plane.
263 // 2. Propagation to the geometrical limit of the TRD volume. If track propagation fails the AliESDtrack::kTRDStop is set.
264 // 3. Prolongation inside the fiducial volume (see AliTRDtrackerV1::FollowBackProlongation()) and marking
265 // the following status bits:
266 // - AliESDtrack::kTRDin - if the tracks enters the TRD fiducial volume
267 // - AliESDtrack::kTRDStop - if the tracks fails propagation
268 // - AliESDtrack::kTRDbackup - if the tracks fulfills chi2 conditions and qualify for refitting
269 // 4. Writting to friends, PID, MC label, quality etc. Setting status bit AliESDtrack::kTRDout.
270 // 5. Propagation to TOF. If track propagation fails the AliESDtrack::kTRDStop is set.
273 if(!fClusters || !fClusters->GetEntriesFast()){
274 AliInfo("No TRD clusters");
277 AliTRDCalibraFillHisto *calibra = AliTRDCalibraFillHisto::Instance(); // Calibration monitor
278 if (!calibra) AliInfo("Could not get Calibra instance");
279 if (!fgNTimeBins) fgNTimeBins = fkReconstructor->GetNTimeBins();
282 Int_t nFound = 0, // number of tracks found
283 nBacked = 0, // number of tracks backed up for refit
284 nSeeds = 0, // total number of ESD seeds
285 nTRDseeds= 0, // number of seeds in the TRD acceptance
286 nTPCseeds= 0; // number of TPC seeds
287 Float_t foundMin = 20.0;
289 Float_t *quality = NULL;
291 fEventInFile = event->GetEventNumberInFile();
292 nSeeds = event->GetNumberOfTracks();
293 // Sort tracks according to quality
294 // (covariance in the yz plane)
296 quality = new Float_t[nSeeds];
297 index = new Int_t[4*nSeeds];
298 for (Int_t iSeed = nSeeds; iSeed--;) {
299 AliESDtrack *seed = event->GetTrack(iSeed);
300 Double_t covariance[15];
301 seed->GetExternalCovariance(covariance);
302 quality[iSeed] = covariance[0] + covariance[2];
304 TMath::Sort(nSeeds, quality, index,kFALSE);
307 // Propagate all seeds
310 for (Int_t iSeed = 0; iSeed < nSeeds; iSeed++) {
312 // Get the seeds in sorted sequence
313 AliESDtrack *seed = event->GetTrack(index[iSeed]);
314 Float_t p4 = seed->GetC(seed->GetBz());
316 // Check the seed status
317 ULong_t status = seed->GetStatus();
318 if ((status & AliESDtrack::kTRDout) != 0) continue;
319 if ((status & AliESDtrack::kTPCout)){
320 AliDebug(3, Form("Prolongate seed[%2d] which is TPC.", iSeed));
321 // set steering parameters for TPC
322 //fkRecoParam->SetTrackParam(kTPC);
324 if ((status & AliESDtrack::kITSout)){
325 AliDebug(3, Form("Prolongate seed[%2d] which is ITS.", iSeed));
326 // set steering parameters for ITS
327 //fkRecoParam->SetTrackParam(kITS);
329 Float_t globalToTracking = AliTRDgeometry::GetAlpha()*(Int_t(seed->GetAlpha()/AliTRDgeometry::GetAlpha()) + (seed->GetAlpha()>0. ? 0.5 : -0.5));
330 if(!seed->Rotate(globalToTracking)) continue;
334 // Propagate to the entrance in the TRD mother volume
335 track.~AliTRDtrackV1();
336 new(&track) AliTRDtrackV1(*seed);
337 if(AliTRDgeometry::GetXtrdBeg() > (AliTRDReconstructor::GetMaxStep() + track.GetX()) && !PropagateToX(track, AliTRDgeometry::GetXtrdBeg(), AliTRDReconstructor::GetMaxStep())){
338 seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
341 if(!AdjustSector(&track)){
342 seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
345 if(TMath::Abs(track.GetSnp()) > AliTRDReconstructor::GetMaxSnp()) {
346 seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
350 AliDebug(2, Form("TRD propagate TPC seed[%d] = %d.", iSeed, index[iSeed]));
351 // store track status at TRD entrance
352 seed->UpdateTrackParams(&track, AliESDtrack::kTRDbackup);
354 // prepare track and do propagation in the TRD
355 track.SetReconstructor(fkReconstructor);
356 track.SetKink(Bool_t(seed->GetKinkIndex(0)));
357 track.SetPrimary(status & AliESDtrack::kTPCin);
358 expectedClr = FollowBackProlongation(track);
359 // check if track entered the TRD fiducial volume
360 if(track.GetTrackIn()){
361 seed->UpdateTrackParams(&track, AliESDtrack::kTRDin);
364 // check if track was stopped in the TRD
366 seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
373 track.CookLabel(1. - AliTRDReconstructor::GetLabelFraction());
374 // update calibration references using this track
375 if(calibra->GetHisto2d()) calibra->UpdateHistogramsV1(&track);
376 // save calibration object
377 if (fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 0) {
378 AliTRDtrackV1 *calibTrack = new AliTRDtrackV1(track);
379 calibTrack->SetOwner();
380 seed->AddCalibObject(calibTrack);
383 seed->UpdateTrackParams(&track, AliESDtrack::kTRDout);
384 track.UpdateESDtrack(seed);
387 // Make backup for back propagation
388 if ((TMath::Abs(track.GetC(track.GetBz()) - p4) / TMath::Abs(p4) < 0.2) || (track.Pt() > 0.8)) {
389 Int_t foundClr = track.GetNumberOfClusters();
390 if (foundClr >= foundMin) {
391 //if(track.GetBackupTrack()) UseClusters(track.GetBackupTrack());
393 // Sign only gold tracks
394 if (track.GetChi2() / track.GetNumberOfClusters() < 4) {
395 //if ((seed->GetKinkIndex(0) == 0) && (track.Pt() < 1.5)) UseClusters(&track);
397 Bool_t isGold = kFALSE;
400 if (track.GetChi2() / track.GetNumberOfClusters() < 5) {
401 if (track.GetBackupTrack()) seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup);
407 if ((!isGold) && (track.GetNCross() == 0) && (track.GetChi2() / track.GetNumberOfClusters() < 7)) {
408 //seed->UpdateTrackParams(track, AliESDtrack::kTRDbackup);
409 if (track.GetBackupTrack()) seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup);
414 if ((!isGold) && (track.GetBackupTrack())) {
415 if ((track.GetBackupTrack()->GetNumberOfClusters() > foundMin) && ((track.GetBackupTrack()->GetChi2()/(track.GetBackupTrack()->GetNumberOfClusters()+1)) < 7)) {
416 seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup);
424 // Propagation to the TOF
425 if(!(seed->GetStatus()&AliESDtrack::kTRDStop)) {
426 Int_t sm = track.GetSector();
427 // default value in case we have problems with the geometry.
428 Double_t xtof = 371.;
429 //Calculate radial position of the beginning of the TOF
430 //mother volume. In order to avoid mixing of the TRD
431 //and TOF modules some hard values are needed. This are:
432 //1. The path to the TOF module.
433 //2. The width of the TOF (29.05 cm)
434 //(with the help of Annalisa de Caro Mar-17-2009)
436 gGeoManager->cd(Form("/ALIC_1/B077_1/BSEGMO%d_1/BTOF%d_1", sm, sm));
437 TGeoHMatrix *m = NULL;
438 Double_t loc[]={0., 0., -.5*29.05}, glob[3];
440 if((m=gGeoManager->GetCurrentMatrix())){
441 m->LocalToMaster(loc, glob);
442 xtof = TMath::Sqrt(glob[0]*glob[0]+glob[1]*glob[1]);
445 if(xtof > (AliTRDReconstructor::GetMaxStep() + track.GetX()) && !PropagateToX(track, xtof, AliTRDReconstructor::GetMaxStep())){
446 seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
449 if(!AdjustSector(&track)){
450 seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
453 if(TMath::Abs(track.GetSnp()) > AliTRDReconstructor::GetMaxSnp()){
454 seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
457 //seed->UpdateTrackParams(&track, AliESDtrack::kTRDout);
458 // TODO obsolete - delete
459 seed->SetTRDQuality(track.StatusForTOF());
461 seed->SetTRDBudget(track.GetBudget(0));
463 if(index) delete [] index;
464 if(quality) delete [] quality;
466 AliInfo(Form("Number of seeds: TPCout[%d] TRDin[%d]", nTPCseeds, nTRDseeds));
467 AliInfo(Form("Number of tracks: TRDout[%d] TRDbackup[%d]", nFound, nBacked));
469 // run stand alone tracking
470 if (fkReconstructor->IsSeeding()) Clusters2Tracks(event);
476 //____________________________________________________________________
477 Int_t AliTRDtrackerV1::RefitInward(AliESDEvent *event)
480 // Refits tracks within the TRD. The ESD event is expected to contain seeds
481 // at the outer part of the TRD.
482 // The tracks are propagated to the innermost time bin
483 // of the TRD and the ESD event is updated
484 // Origin: Thomas KUHR (Thomas.Kuhr@cern.ch)
487 Int_t nseed = 0; // contor for loaded seeds
488 Int_t found = 0; // contor for updated TRD tracks
491 if(!fClusters || !fClusters->GetEntriesFast()){
492 AliInfo("No TRD clusters");
496 for (Int_t itrack = 0; itrack < event->GetNumberOfTracks(); itrack++) {
497 AliESDtrack *seed = event->GetTrack(itrack);
498 ULong_t status = seed->GetStatus();
500 new(&track) AliTRDtrackV1(*seed);
501 if (track.GetX() < 270.0) {
502 seed->UpdateTrackParams(&track, AliESDtrack::kTRDbackup);
506 // reject tracks which failed propagation in the TRD or
507 // are produced by the TRD stand alone tracker
508 if(!(status & AliESDtrack::kTRDout)) continue;
509 if(!(status & AliESDtrack::kTRDin)) continue;
512 track.ResetCovariance(50.0);
514 // do the propagation and processing
515 Bool_t kUPDATE = kFALSE;
516 Double_t xTPC = 250.0;
517 if(FollowProlongation(track)){
518 // Update the friend track
519 if (fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 0){
520 TObject *o = NULL; Int_t ic = 0;
521 AliTRDtrackV1 *calibTrack = NULL;
522 while((o = seed->GetCalibObject(ic++))){
523 if(!(calibTrack = dynamic_cast<AliTRDtrackV1*>(o))) continue;
524 calibTrack->SetTrackOut(&track);
529 if (PropagateToX(track, xTPC, AliTRDReconstructor::GetMaxStep())) { // -with update
530 seed->UpdateTrackParams(&track, AliESDtrack::kTRDrefit);
536 // Prolongate to TPC without update
538 AliTRDtrackV1 tt(*seed);
539 if (PropagateToX(tt, xTPC, AliTRDReconstructor::GetMaxStep())) seed->UpdateTrackParams(&tt, AliESDtrack::kTRDbackup);
542 AliInfo(Form("Number of seeds: TRDout[%d]", nseed));
543 AliInfo(Form("Number of tracks: TRDrefit[%d]", found));
548 //____________________________________________________________________
549 Int_t AliTRDtrackerV1::FollowProlongation(AliTRDtrackV1 &t)
551 // Extrapolates the TRD track in the TPC direction.
554 // t : the TRD track which has to be extrapolated
557 // number of clusters attached to the track
559 // Detailed description
561 // Starting from current radial position of track <t> this function
562 // extrapolates the track through the 6 TRD layers. The following steps
563 // are being performed for each plane:
565 // a. get plane limits in the local x direction
566 // b. check crossing sectors
567 // c. check track inclination
568 // 2. search tracklet in the tracker list (see GetTracklet() for details)
569 // 3. evaluate material budget using the geo manager
570 // 4. propagate and update track using the tracklet information.
575 Int_t nClustersExpected = 0;
576 for (Int_t iplane = kNPlanes; iplane--;) {
578 AliTRDseedV1 *tracklet = GetTracklet(&t, iplane, index);
579 AliDebug(2, Form("Tracklet[%p] ly[%d] idx[%d]", (void*)tracklet, iplane, index));
580 if(!tracklet) continue;
581 if(!tracklet->IsOK()){
582 AliDebug(1, Form("Tracklet Det[%d] !OK", tracklet->GetDetector()));
585 Double_t x = tracklet->GetX();//GetX0();
586 // reject tracklets which are not considered for inward refit
587 if(x > t.GetX()+AliTRDReconstructor::GetMaxStep()) continue;
589 // append tracklet to track
590 t.SetTracklet(tracklet, index);
592 if (x < (t.GetX()-AliTRDReconstructor::GetMaxStep()) && !PropagateToX(t, x+AliTRDReconstructor::GetMaxStep(), AliTRDReconstructor::GetMaxStep())) break;
593 if (!AdjustSector(&t)) break;
595 // Start global position
599 // End global position
600 Double_t alpha = t.GetAlpha(), y, z;
601 if (!t.GetProlongation(x,y,z)) break;
603 xyz1[0] = x * TMath::Cos(alpha) - y * TMath::Sin(alpha);
604 xyz1[1] = x * TMath::Sin(alpha) + y * TMath::Cos(alpha);
607 Double_t length = TMath::Sqrt(
608 (xyz0[0]-xyz1[0])*(xyz0[0]-xyz1[0]) +
609 (xyz0[1]-xyz1[1])*(xyz0[1]-xyz1[1]) +
610 (xyz0[2]-xyz1[2])*(xyz0[2]-xyz1[2])
613 // Get material budget
615 if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param)<=0.) break;
616 Double_t xrho= param[0]*param[4];
617 Double_t xx0 = param[1]; // Get mean propagation parameters
619 // Propagate and update
620 t.PropagateTo(x, xx0, xrho);
621 if (!AdjustSector(&t)) break;
624 Double_t cov[3]; tracklet->GetCovAt(x, cov);
625 Double_t p[2] = { tracklet->GetY(), tracklet->GetZ()};
626 Double_t chi2 = ((AliExternalTrackParam)t).GetPredictedChi2(p, cov);
627 if(fkReconstructor->IsDebugStreaming()){
628 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
629 TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
630 AliExternalTrackParam param0(t);
631 AliExternalTrackParam param1(t);
632 param1.Update(p, cov);
633 TVectorD vcov(3,cov);
635 cstreamer << "FollowProlongationInfo"
636 << "EventNumber=" << eventNumber
640 << "tracklet.=" << tracklet
641 << "param0.=" << ¶m0
642 << "param1.=" << ¶m1
645 if (chi2 < 1e+10 && ((AliExternalTrackParam&)t).Update(p, cov)){
646 // Register info to track
647 t.SetNumberOfClusters();
649 nClustersExpected += tracklet->GetN();
653 if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 1){
655 for(int iplane=0; iplane<AliTRDgeometry::kNlayer; iplane++){
656 AliTRDseedV1 *tracklet = GetTracklet(&t, iplane, index);
657 if(!tracklet) continue;
658 t.SetTracklet(tracklet, index);
661 if(fkReconstructor->IsDebugStreaming()){
662 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
663 TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
664 AliTRDtrackV1 track(t);
666 cstreamer << "FollowProlongation"
667 << "EventNumber=" << eventNumber
668 << "ncl=" << nClustersExpected
669 << "track.=" << &track
673 return nClustersExpected;
677 //_____________________________________________________________________________
678 Int_t AliTRDtrackerV1::FollowBackProlongation(AliTRDtrackV1 &t)
680 // Extrapolates/Build the TRD track in the TOF direction.
683 // t : the TRD track which has to be extrapolated
686 // number of clusters attached to the track
688 // Starting from current radial position of track <t> this function
689 // extrapolates the track through the 6 TRD layers. The following steps
690 // are being performed for each plane:
691 // 1. Propagate track to the entrance of the next chamber:
692 // - get chamber limits in the radial direction
693 // - check crossing sectors
694 // - check track inclination
695 // - check track prolongation against boundary conditions (see exclusion boundaries on AliTRDgeometry::IsOnBoundary())
696 // 2. Build tracklet (see AliTRDseed::AttachClusters() for details) for this layer if needed. If only
697 // Kalman filter is needed and tracklets are already linked to the track this step is skipped.
698 // 3. Fit tracklet using the information from the Kalman filter.
699 // 4. Propagate and update track at reference radial position of the tracklet.
700 // 5. Register tracklet with the tracker and track; update pulls monitoring.
703 // 1. During the propagation a bit map is filled detailing the status of the track in each TRD chamber. The following errors are being registered for each tracklet:
704 // - AliTRDtrackV1::kProlongation : track prolongation failed
705 // - AliTRDtrackV1::kPropagation : track prolongation failed
706 // - AliTRDtrackV1::kAdjustSector : failed during sector crossing
707 // - AliTRDtrackV1::kSnp : too large bending
708 // - AliTRDtrackV1::kTrackletInit : fail to initialize tracklet
709 // - AliTRDtrackV1::kUpdate : fail to attach clusters or fit the tracklet
710 // - AliTRDtrackV1::kUnknown : anything which is not covered before
711 // 2. By default the status of the track before first TRD update is saved.
716 // Alexandru Bercuci <A.Bercuci@gsi.de>
720 Double_t driftLength = .5*AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick();
721 AliTRDtrackingChamber *chamber = NULL;
723 Int_t debugLevel = fkReconstructor->IsDebugStreaming() ? fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) : 0;
724 TTreeSRedirector *cstreamer = fkReconstructor->IsDebugStreaming() ? fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker) : 0x0;
726 Bool_t kStoreIn(kTRUE), // toggel store track params. at TRD entry
727 kStandAlone(kFALSE), // toggle tracker awarness of stand alone seeding
728 kUseTRD(fkRecoParam->IsOverPtThreshold(t.Pt()));// use TRD measurment to update Kalman
731 AliTRDseedV1 tracklet, *ptrTracklet = NULL;
732 // Special case for stand alone tracking
733 // - store all tracklets found by seeding
734 // - start propagation from first tracklet found
735 AliTRDseedV1 *tracklets[kNPlanes];
736 memset(tracklets, 0, sizeof(AliTRDseedV1 *) * kNPlanes);
737 for(Int_t ip(kNPlanes); ip--;){
738 if(!(tracklets[ip] = t.GetTracklet(ip))) continue;
740 if(tracklets[ip]->IsOK()) startLayer=ip;
744 AliDebug(4, Form("SA[%c] Start[%d]\n"
745 " [0]idx[%d] traklet[%p]\n"
746 " [1]idx[%d] traklet[%p]\n"
747 " [2]idx[%d] traklet[%p]\n"
748 " [3]idx[%d] traklet[%p]\n"
749 " [4]idx[%d] traklet[%p]\n"
750 " [5]idx[%d] traklet[%p]"
751 , kStandAlone?'y':'n', startLayer
752 , t.GetTrackletIndex(0), (void*)tracklets[0]
753 , t.GetTrackletIndex(1), (void*)tracklets[1]
754 , t.GetTrackletIndex(2), (void*)tracklets[2]
755 , t.GetTrackletIndex(3), (void*)tracklets[3]
756 , t.GetTrackletIndex(4), (void*)tracklets[4]
757 , t.GetTrackletIndex(5), (void*)tracklets[5]));
759 // Loop through the TRD layers
760 TGeoHMatrix *matrix = NULL;
761 Double_t x(0.), y(0.), z(0.);
762 for (Int_t ily=startLayer, sm=-1, stk=-1, det=-1; ily < AliTRDgeometry::kNlayer; ily++) {
763 AliDebug(2, Form("Propagate to x[%d] = %7.2f", ily, fR[ily]));
765 // rough estimate of the entry point
766 if (!t.GetProlongation(fR[ily], y, z)){
768 t.SetErrStat(AliTRDtrackV1::kProlongation);
769 AliDebug(4, Form("Failed Rough Prolongation to ly[%d] x[%7.2f] y[%7.2f] z[%7.2f]", ily, fR[ily], y, z));
773 // find sector / stack / detector
775 // TODO cross check with y value !
776 stk = fGeom->GetStack(z, ily);
777 det = stk>=0 ? AliTRDgeometry::GetDetector(ily, stk, sm) : -1;
778 matrix = det>=0 ? fGeom->GetClusterMatrix(det) : NULL;
780 // check if supermodule/chamber is installed
781 if( !fGeom->GetSMstatus(sm) ||
783 fGeom->IsHole(ily, stk, sm) ||
785 AliDebug(4, Form("Missing Geometry ly[%d]. Guess radial position", ily));
786 // propagate to the default radial position
787 if(fR[ily] > (AliTRDReconstructor::GetMaxStep() + t.GetX()) && !PropagateToX(t, fR[ily], AliTRDReconstructor::GetMaxStep())){
789 t.SetErrStat(AliTRDtrackV1::kPropagation);
790 AliDebug(4, "Failed Propagation [Missing Geometry]");
793 if(!AdjustSector(&t)){
795 t.SetErrStat(AliTRDtrackV1::kAdjustSector);
796 AliDebug(4, "Failed Adjust Sector [Missing Geometry]");
799 if(TMath::Abs(t.GetSnp()) > AliTRDReconstructor::GetMaxSnp()){
801 t.SetErrStat(AliTRDtrackV1::kSnp);
802 AliDebug(4, "Failed Max Snp [Missing Geometry]");
805 t.SetErrStat(AliTRDtrackV1::kGeometry, ily);
809 // retrieve rotation matrix for the current chamber
810 Double_t loc[] = {AliTRDgeometry::AnodePos()- driftLength, 0., 0.};
811 Double_t glb[] = {0., 0., 0.};
812 matrix->LocalToMaster(loc, glb);
813 AliDebug(3, Form("Propagate to det[%3d] x_anode[%7.2f] (%f %f)", det, glb[0]+driftLength, glb[1], glb[2]));
815 // Propagate to the radial distance of the current layer
816 x = glb[0] - AliTRDReconstructor::GetMaxStep();
817 if(x > (AliTRDReconstructor::GetMaxStep() + t.GetX()) && !PropagateToX(t, x, AliTRDReconstructor::GetMaxStep())){
819 t.SetErrStat(AliTRDtrackV1::kPropagation);
820 AliDebug(4, Form("Failed Initial Propagation to x[%7.2f]", x));
823 if(!AdjustSector(&t)){
825 t.SetErrStat(AliTRDtrackV1::kAdjustSector);
826 AliDebug(4, "Failed Adjust Sector Start");
829 if(TMath::Abs(t.GetSnp()) > AliTRDReconstructor::GetMaxSnp()) {
831 t.SetErrStat(AliTRDtrackV1::kSnp);
832 AliDebug(4, Form("Failed Max Snp[%f] MaxSnp[%f]", t.GetSnp(), AliTRDReconstructor::GetMaxSnp()));
835 Bool_t doRecalculate = kFALSE;
836 if(sm != t.GetSector()){
838 doRecalculate = kTRUE;
840 if(stk != fGeom->GetStack(z, ily)){
841 stk = fGeom->GetStack(z, ily);
842 doRecalculate = kTRUE;
845 det = AliTRDgeometry::GetDetector(ily, stk, sm);
846 if(!(matrix = fGeom->GetClusterMatrix(det))){
847 t.SetErrStat(AliTRDtrackV1::kGeometry, ily);
848 AliDebug(4, Form("Failed Geometry Matrix ly[%d]", ily));
851 matrix->LocalToMaster(loc, glb);
852 x = glb[0] - AliTRDReconstructor::GetMaxStep();
855 // check if track is well inside fiducial volume
856 if (!t.GetProlongation(x+AliTRDReconstructor::GetMaxStep(), y, z)) {
858 t.SetErrStat(AliTRDtrackV1::kProlongation);
859 AliDebug(4, Form("Failed Prolongation to x[%7.2f] y[%7.2f] z[%7.2f]", x+AliTRDReconstructor::GetMaxStep(), y, z));
862 if(fGeom->IsOnBoundary(det, y, z, .5)){
863 t.SetErrStat(AliTRDtrackV1::kBoundary, ily);
864 AliDebug(4, "Failed Track on Boundary");
868 ptrTracklet = tracklets[ily];
869 if(!ptrTracklet){ // BUILD TRACKLET
870 AliDebug(3, Form("Building tracklet det[%d]", det));
871 // check data in supermodule
872 if(!fTrSec[sm].GetNChambers()){
873 t.SetErrStat(AliTRDtrackV1::kNoClusters, ily);
874 AliDebug(4, "Failed NoClusters");
877 if(fTrSec[sm].GetX(ily) < 1.){
878 t.SetErrStat(AliTRDtrackV1::kNoClusters, ily);
879 AliDebug(4, "Failed NoX");
883 // check data in chamber
884 if(!(chamber = fTrSec[sm].GetChamber(stk, ily))){
885 t.SetErrStat(AliTRDtrackV1::kNoClusters, ily);
886 AliDebug(4, "Failed No Detector");
889 if(chamber->GetNClusters() < fgNTimeBins*fkRecoParam ->GetFindableClusters()){
890 t.SetErrStat(AliTRDtrackV1::kNoClusters, ily);
891 AliDebug(4, "Failed Not Enough Clusters in Detector");
895 tracklet.~AliTRDseedV1();
896 ptrTracklet = new(&tracklet) AliTRDseedV1(det);
897 ptrTracklet->SetReconstructor(fkReconstructor);
898 ptrTracklet->SetKink(t.IsKink());
899 ptrTracklet->SetPrimary(t.IsPrimary());
900 ptrTracklet->SetPadPlane(fGeom->GetPadPlane(ily, stk));
901 ptrTracklet->SetX0(glb[0]+driftLength);
902 if(!ptrTracklet->Init(&t)){
904 t.SetErrStat(AliTRDtrackV1::kTrackletInit);
905 AliDebug(4, "Failed Tracklet Init");
908 // Select attachment base on track to B field sign not only track charge which is buggy
909 // mark kFALSE same sign tracks and kTRUE opposite sign tracks
910 // A.Bercuci 3.11.2011
911 Float_t prod(t.GetBz()*t.Charge());
912 if(!ptrTracklet->AttachClusters(chamber, kTRUE, prod<0.?kTRUE:kFALSE, fEventInFile)){
913 t.SetErrStat(AliTRDtrackV1::kNoAttach, ily);
915 AliTRDseedV1 trackletCp(*ptrTracklet);
916 UChar_t status(t.GetStatusTRD(ily));
917 (*cstreamer) << "FollowBackProlongation4"
918 <<"status=" << status
919 <<"tracklet.=" << &trackletCp
922 AliDebug(4, "Failed Attach Clusters");
925 AliDebug(3, Form("Number of Clusters in Tracklet: %d", ptrTracklet->GetN()));
926 if(ptrTracklet->GetN() < fgNTimeBins*fkRecoParam->GetFindableClusters()){
927 t.SetErrStat(AliTRDtrackV1::kNoClustersTracklet, ily);
929 AliTRDseedV1 trackletCp(*ptrTracklet);
930 UChar_t status(t.GetStatusTRD(ily));
931 (*cstreamer) << "FollowBackProlongation4"
932 <<"status=" << status
933 <<"tracklet.=" << &trackletCp
936 AliDebug(4, "Failed N Clusters Attached");
939 ptrTracklet->UpdateUsed();
940 } else AliDebug(2, Form("Use external tracklet ly[%d]", ily));
941 // propagate track to the radial position of the tracklet
944 // tilt correction options
946 // 2 : pseudo tilt correction
947 if(!ptrTracklet->FitRobust(t.Charge()>0?kTRUE:kFALSE)){
948 t.SetErrStat(AliTRDtrackV1::kNoFit, ily);
949 AliDebug(4, "Failed Tracklet Fit");
952 x = ptrTracklet->GetX(); //GetX0();
953 if(x > (AliTRDReconstructor::GetMaxStep() + t.GetX()) && !PropagateToX(t, x, AliTRDReconstructor::GetMaxStep())) {
955 t.SetErrStat(AliTRDtrackV1::kPropagation);
956 AliDebug(4, Form("Failed Propagation to Tracklet x[%7.2f]", x));
959 if(!AdjustSector(&t)) {
961 t.SetErrStat(AliTRDtrackV1::kAdjustSector);
962 AliDebug(4, "Failed Adjust Sector");
965 if(TMath::Abs(t.GetSnp()) > AliTRDReconstructor::GetMaxSnp()) {
967 t.SetErrStat(AliTRDtrackV1::kSnp);
968 AliDebug(4, Form("Failed Max Snp[%f] MaxSnp[%f]", t.GetSnp(), AliTRDReconstructor::GetMaxSnp()));
971 Double_t cov[3]; ptrTracklet->GetCovAt(x, cov);
972 Double_t p[2] = { ptrTracklet->GetY(), ptrTracklet->GetZ()};
973 Double_t chi2 = ((AliExternalTrackParam)t).GetPredictedChi2(p, cov);
974 // update Kalman with the TRD measurement
975 if(chi2>1e+10){ // TODO
976 t.SetErrStat(AliTRDtrackV1::kChi2, ily);
978 UChar_t status(t.GetStatusTRD());
979 AliTRDseedV1 trackletCp(*ptrTracklet);
980 AliTRDtrackV1 trackCp(t);
982 (*cstreamer) << "FollowBackProlongation3"
983 << "status=" << status
984 << "tracklet.=" << &trackletCp
985 << "track.=" << &trackCp
988 AliDebug(4, Form("Failed Chi2[%f]", chi2));
991 if(fkReconstructor->IsDebugStreaming()){
992 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
993 // TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
994 AliExternalTrackParam param0(t);
995 AliExternalTrackParam param1(t);
996 param1.Update(p, cov);
997 TVectorD vcov(3,cov);
999 (*cstreamer) << "FollowBackProlongationInfo"
1000 << "EventNumber=" << eventNumber
1005 << "tracklet.=" << ptrTracklet
1006 << "param0.=" << ¶m0
1007 << "param1.=" << ¶m1
1011 // mark track as entering the FIDUCIAL volume of TRD
1017 if(!((AliExternalTrackParam&)t).Update(p, cov)) {
1019 t.SetErrStat(AliTRDtrackV1::kUpdate);
1021 UChar_t status(t.GetStatusTRD());
1022 AliTRDseedV1 trackletCp(*ptrTracklet);
1023 AliTRDtrackV1 trackCp(t);
1025 (*cstreamer) << "FollowBackProlongation3"
1026 << "status=" << status
1027 << "tracklet.=" << &trackletCp
1028 << "track.=" << &trackCp
1031 AliDebug(4, Form("Failed Track Update @ y[%7.2f] z[%7.2f] s2y[%f] s2z[%f] covyz[%f]", p[0], p[1], cov[0], cov[2], cov[1]));
1035 if(!kStandAlone) ptrTracklet->UseClusters();
1036 // fill residuals ?!
1037 AliTracker::FillResiduals(&t, p, cov, ptrTracklet->GetVolumeId());
1040 // register tracklet with the tracker and track
1041 // Save inside the tracklet the track parameters BEFORE track update.
1042 // Commented out their overwriting AFTER track update
1043 // A.Bercuci 3.11.2011
1044 //ptrTracklet->Update(&t);
1045 ptrTracklet = SetTracklet(ptrTracklet);
1046 Int_t index(fTracklets->GetEntriesFast()-1);
1047 t.SetTracklet(ptrTracklet, index);
1048 // Register info to track
1049 t.SetNumberOfClusters();
1052 n += ptrTracklet->GetN();
1053 AliDebug(2, Form("Setting Tracklet[%d] @ Idx[%d]", ily, index));
1055 // Reset material budget if 2 consecutive gold
1056 // if(ilayer>0 && t.GetTracklet(ilayer-1) && ptrTracklet->GetN() + t.GetTracklet(ilayer-1)->GetN() > 20) t.SetBudget(2, 0.);
1058 // Make backup of the track until is gold
1060 if(!kStandAlone && (failed = t.MakeBackupTrack())) AliDebug(2, Form("Failed backup on cut[%d]", failed));
1062 } // end layers loop
1063 //printf("clusters[%d] chi2[%f] x[%f] status[%d ", n, t.GetChi2(), t.GetX(), t.GetStatusTRD());
1064 //for(int i=0; i<6; i++) printf("%d ", t.GetStatusTRD(i)); printf("]\n");
1066 if(n && debugLevel > 1){
1067 //Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
1068 AliTRDtrackV1 track(t);
1070 (*cstreamer) << "FollowBackProlongation2"
1071 << "EventNumber=" << fEventInFile
1072 << "track.=" << &track
1079 //_________________________________________________________________________
1080 Float_t AliTRDtrackerV1::FitRieman(AliTRDseedV1 *tracklets, Double_t *chi2, Int_t *const planes){
1082 // Fits a Riemann-circle to the given points without tilting pad correction.
1083 // The fit is performed using an instance of the class AliRieman (equations
1084 // and transformations see documentation of this class)
1085 // Afterwards all the tracklets are Updated
1087 // Parameters: - Array of tracklets (AliTRDseedV1)
1088 // - Storage for the chi2 values (beginning with direction z)
1089 // - Seeding configuration
1090 // Output: - The curvature
1092 AliRieman *fitter = AliTRDtrackerV1::GetRiemanFitter();
1094 Int_t allplanes[] = {0, 1, 2, 3, 4, 5};
1095 Int_t *ppl = &allplanes[0];
1096 Int_t maxLayers = 6;
1101 for(Int_t il = 0; il < maxLayers; il++){
1102 if(!tracklets[ppl[il]].IsOK()) continue;
1103 fitter->AddPoint(tracklets[ppl[il]].GetX0(), tracklets[ppl[il]].GetYfit(0), tracklets[ppl[il]].GetZfit(0),1,10);
1106 // Set the reference position of the fit and calculate the chi2 values
1107 memset(chi2, 0, sizeof(Double_t) * 2);
1108 for(Int_t il = 0; il < maxLayers; il++){
1109 // Reference positions
1110 tracklets[ppl[il]].Init(fitter);
1113 if((!tracklets[ppl[il]].IsOK()) && (!planes)) continue;
1114 chi2[0] += tracklets[ppl[il]].GetChi2Y();
1115 chi2[1] += tracklets[ppl[il]].GetChi2Z();
1117 return fitter->GetC();
1120 //_________________________________________________________________________
1121 void AliTRDtrackerV1::FitRieman(AliTRDcluster **seedcl, Double_t chi2[2])
1124 // Performs a Riemann helix fit using the seedclusters as spacepoints
1125 // Afterwards the chi2 values are calculated and the seeds are updated
1127 // Parameters: - The four seedclusters
1128 // - The tracklet array (AliTRDseedV1)
1129 // - The seeding configuration
1134 AliRieman *fitter = AliTRDtrackerV1::GetRiemanFitter();
1136 for(Int_t i = 0; i < 4; i++){
1137 fitter->AddPoint(seedcl[i]->GetX(), seedcl[i]->GetY(), seedcl[i]->GetZ(), 1., 10.);
1142 // Update the seed and calculated the chi2 value
1143 chi2[0] = 0; chi2[1] = 0;
1144 for(Int_t ipl = 0; ipl < kNSeedPlanes; ipl++){
1146 chi2[0] += (seedcl[ipl]->GetZ() - fitter->GetZat(seedcl[ipl]->GetX())) * (seedcl[ipl]->GetZ() - fitter->GetZat(seedcl[ipl]->GetX()));
1147 chi2[1] += (seedcl[ipl]->GetY() - fitter->GetYat(seedcl[ipl]->GetX())) * (seedcl[ipl]->GetY() - fitter->GetYat(seedcl[ipl]->GetX()));
1152 //_________________________________________________________________________
1153 Float_t AliTRDtrackerV1::FitTiltedRiemanConstraint(AliTRDseedV1 *tracklets, Double_t zVertex)
1156 // Fits a helix to the clusters. Pad tilting is considered. As constraint it is
1157 // assumed that the vertex position is set to 0.
1158 // This method is very usefull for high-pt particles
1159 // Basis for the fit: (x - x0)^2 + (y - y0)^2 - R^2 = 0
1160 // x0, y0: Center of the circle
1161 // Measured y-position: ymeas = y - tan(phiT)(zc - zt)
1162 // zc: center of the pad row
1163 // Equation which has to be fitted (after transformation):
1164 // a + b * u + e * v + 2*(ymeas + tan(phiT)(z - zVertex))*t = 0
1166 // t = 1/(x^2 + y^2)
1168 // v = 2 * x * tan(phiT) * t
1169 // Parameters in the equation:
1170 // a = -1/y0, b = x0/y0, e = dz/dx
1172 // The Curvature is calculated by the following equation:
1173 // - curv = a/Sqrt(b^2 + 1) = 1/R
1174 // Parameters: - the 6 tracklets
1175 // - the Vertex constraint
1176 // Output: - the Chi2 value of the track
1181 TLinearFitter *fitter = GetTiltedRiemanFitterConstraint();
1182 fitter->StoreData(kTRUE);
1183 fitter->ClearPoints();
1184 AliTRDcluster *cl = NULL;
1186 Float_t x, y, z, w, t, error, tilt;
1189 for(Int_t ilr = 0; ilr < AliTRDgeometry::kNlayer; ilr++){
1190 if(!tracklets[ilr].IsOK()) continue;
1191 for(Int_t itb = 0; itb < AliTRDseedV1::kNclusters; itb++){
1192 if(!tracklets[ilr].IsUsable(itb)) continue;
1193 if(!(cl = tracklets[ilr].GetClusters(itb))) continue;
1194 if(!cl->IsInChamber()) continue;
1198 tilt = tracklets[ilr].GetTilt();
1200 t = 1./(x * x + y * y);
1201 uvt[0] = 2. * x * t;
1202 uvt[1] = 2. * x * t * tilt ;
1203 w = 2. * (y + tilt * (z - zVertex)) * t;
1204 error = 2. * TMath::Sqrt(cl->GetSigmaY2()+tilt*tilt*cl->GetSigmaZ2()) * t;
1205 fitter->AddPoint(uvt, w, error);
1211 // Calculate curvature
1212 Double_t a = fitter->GetParameter(0);
1213 Double_t b = fitter->GetParameter(1);
1214 Double_t curvature = a/TMath::Sqrt(b*b + 1);
1216 Float_t chi2track = 0.0;
1218 chi2track = fitter->GetChisquare()/Double_t(nPoints);
1220 for(Int_t ip = 0; ip < AliTRDtrackerV1::kNPlanes; ip++)
1221 tracklets[ip].SetC(curvature, 1);
1223 if(AliLog::GetDebugLevel("TRD", "AliTRDtrackerV1")>3) printf("D-AliTRDtrackerV1::FitTiltedRiemanConstraint: Chi2[%f] C[%5.2e] pt[%8.3f]\n", chi2track, curvature, GetBz()*kB2C/curvature);
1225 /* if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker()) >= 5){
1226 //Linear Model on z-direction
1227 Double_t xref = CalculateReferenceX(tracklets); // Relative to the middle of the stack
1228 Double_t slope = fitter->GetParameter(2);
1229 Double_t zref = slope * xref;
1230 Float_t chi2Z = CalculateChi2Z(tracklets, zref, slope, xref);
1231 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
1232 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
1233 TTreeSRedirector &treeStreamer = *fkReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
1234 treeStreamer << "FitTiltedRiemanConstraint"
1235 << "EventNumber=" << eventNumber
1236 << "CandidateNumber=" << candidateNumber
1237 << "Curvature=" << curvature
1238 << "Chi2Track=" << chi2track
1239 << "Chi2Z=" << chi2Z
1246 //_________________________________________________________________________
1247 Float_t AliTRDtrackerV1::FitTiltedRieman(AliTRDseedV1 *tracklets, Bool_t sigError)
1250 // Performs a Riemann fit taking tilting pad correction into account
1251 // The equation of a Riemann circle, where the y position is substituted by the
1252 // measured y-position taking pad tilting into account, has to be transformed
1253 // into a 4-dimensional hyperplane equation
1254 // Riemann circle: (x-x0)^2 + (y-y0)^2 -R^2 = 0
1255 // Measured y-Position: ymeas = y - tan(phiT)(zc - zt)
1256 // zc: center of the pad row
1257 // zt: z-position of the track
1258 // The z-position of the track is assumed to be linear dependent on the x-position
1259 // Transformed equation: a + b * u + c * t + d * v + e * w - 2 * (ymeas + tan(phiT) * zc) * t = 0
1260 // Transformation: u = 2 * x * t
1261 // v = 2 * tan(phiT) * t
1262 // w = 2 * tan(phiT) * (x - xref) * t
1263 // t = 1 / (x^2 + ymeas^2)
1264 // Parameters: a = -1/y0
1266 // c = (R^2 -x0^2 - y0^2)/y0
1269 // If the offset respectively the slope in z-position is impossible, the parameters are fixed using
1270 // results from the simple riemann fit. Afterwards the fit is redone.
1271 // The curvature is calculated according to the formula:
1272 // curv = a/(1 + b^2 + c*a) = 1/R
1274 // Paramters: - Array of tracklets (connected to the track candidate)
1275 // - Flag selecting the error definition
1276 // Output: - Chi2 values of the track (in Parameter list)
1278 TLinearFitter *fitter = GetTiltedRiemanFitter();
1279 fitter->StoreData(kTRUE);
1280 fitter->ClearPoints();
1281 AliTRDLeastSquare zfitter;
1282 AliTRDcluster *cl = NULL;
1284 Double_t xref = CalculateReferenceX(tracklets);
1285 Double_t x, y, z, t, tilt, dx, w, we, erry, errz;
1286 Double_t uvt[4], sumPolY[5], sumPolZ[3];
1287 memset(sumPolY, 0, sizeof(Double_t) * 5);
1288 memset(sumPolZ, 0, sizeof(Double_t) * 3);
1290 // Containers for Least-square fitter
1291 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1292 if(!tracklets[ipl].IsOK()) continue;
1293 tilt = tracklets[ipl].GetTilt();
1294 for(Int_t itb = 0; itb < AliTRDseedV1::kNclusters; itb++){
1295 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1296 if(!cl->IsInChamber()) continue;
1297 if (!tracklets[ipl].IsUsable(itb)) continue;
1304 uvt[0] = 2. * x * t;
1306 uvt[2] = 2. * tilt * t;
1307 uvt[3] = 2. * tilt * dx * t;
1308 w = 2. * (y + tilt*z) * t;
1309 // error definition changes for the different calls
1311 we *= sigError ? TMath::Sqrt(cl->GetSigmaY2()+tilt*tilt*cl->GetSigmaZ2()) : 0.2;
1312 fitter->AddPoint(uvt, w, we);
1313 zfitter.AddPoint(&x, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
1314 // adding points for covariance matrix estimation
1315 erry = 1./(TMath::Sqrt(cl->GetSigmaY2()) + 0.1); // 0.1 is a systematic error (due to misalignment and miscalibration)
1317 errz = 1./cl->GetSigmaZ2();
1318 for(Int_t ipol = 0; ipol < 5; ipol++){
1319 sumPolY[ipol] += erry;
1322 sumPolZ[ipol] += errz;
1329 if (fitter->Eval()) return 1.e10;
1332 Double_t offset = fitter->GetParameter(3);
1333 Double_t slope = fitter->GetParameter(4);
1335 // Linear fitter - not possible to make boundaries
1336 // Do not accept non possible z and dzdx combinations
1337 Bool_t acceptablez = kTRUE;
1338 Double_t zref = 0.0;
1339 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
1340 if(!tracklets[iLayer].IsOK()) continue;
1341 zref = offset + slope * (tracklets[iLayer].GetX0() - xref);
1342 if (TMath::Abs(tracklets[iLayer].GetZfit(0) - zref) > tracklets[iLayer].GetPadLength() * 0.5 + 1.0)
1343 acceptablez = kFALSE;
1346 Double_t dzmf = zfitter.GetFunctionParameter(1);
1347 Double_t zmf = zfitter.GetFunctionValue(&xref);
1348 fgTiltedRieman->FixParameter(3, zmf);
1349 fgTiltedRieman->FixParameter(4, dzmf);
1351 fitter->ReleaseParameter(3);
1352 fitter->ReleaseParameter(4);
1353 offset = fitter->GetParameter(3);
1354 slope = fitter->GetParameter(4);
1357 // Calculate Curvarture
1358 Double_t a = fitter->GetParameter(0);
1359 Double_t b = fitter->GetParameter(1);
1360 Double_t c = fitter->GetParameter(2);
1361 Double_t curvature = 1.0 + b*b - c*a;
1362 if (curvature > 0.0) curvature = a / TMath::Sqrt(curvature);
1364 Double_t chi2track = fitter->GetChisquare()/Double_t(nPoints);
1366 // Prepare error calculation
1367 TMatrixD covarPolY(3,3);
1368 covarPolY(0,0) = sumPolY[0]; covarPolY(1,1) = sumPolY[2]; covarPolY(2,2) = sumPolY[4];
1369 covarPolY(0,1) = covarPolY(1,0) = sumPolY[1];
1370 covarPolY(0,2) = covarPolY(2,0) = sumPolY[2];
1371 covarPolY(2,1) = covarPolY(1,2) = sumPolY[3];
1373 TMatrixD covarPolZ(2,2);
1374 covarPolZ(0,0) = sumPolZ[0]; covarPolZ(1,1) = sumPolZ[2];
1375 covarPolZ(1,0) = covarPolZ(0,1) = sumPolZ[1];
1378 // Update the tracklets
1381 memset(cov, 0, sizeof(Double_t) * 15);
1382 for(Int_t iLayer = 0; iLayer < AliTRDtrackerV1::kNPlanes; iLayer++) {
1384 x = tracklets[iLayer].GetX0();
1390 memset(cov, 0, sizeof(Double_t) * 3);
1391 TMatrixD transform(3,3);
1394 transform(0,2) = x*x;
1398 TMatrixD covariance(transform, TMatrixD::kMult, covarPolY);
1399 covariance *= transform.T();
1400 TMatrixD transformZ(2,2);
1401 transformZ(0,0) = transformZ(1,1) = 1;
1402 transformZ(0,1) = x;
1403 TMatrixD covarZ(transformZ, TMatrixD::kMult, covarPolZ);
1404 covarZ *= transformZ.T();
1405 // y: R^2 = (x - x0)^2 + (y - y0)^2
1406 // => y = y0 +/- Sqrt(R^2 - (x - x0)^2)
1407 // R = Sqrt() = 1/Curvature
1408 // => y = y0 +/- Sqrt(1/Curvature^2 - (x - x0)^2)
1409 Double_t res = (x * a + b); // = (x - x0)/y0
1411 res = 1.0 - c * a + b * b - res; // = (R^2 - (x - x0)^2)/y0^2
1413 res = TMath::Sqrt(res);
1414 y = (1.0 - res) / a;
1416 cov[0] = covariance(0,0);
1417 cov[2] = covarZ(0,0);
1420 // dy: R^2 = (x - x0)^2 + (y - y0)^2
1421 // => y = +/- Sqrt(R^2 - (x - x0)^2) + y0
1422 // => dy/dx = (x - x0)/Sqrt(R^2 - (x - x0)^2)
1423 // Curvature: cr = 1/R = a/Sqrt(1 + b^2 - c*a)
1424 // => dy/dx = (x - x0)/(1/(cr^2) - (x - x0)^2)
1425 Double_t x0 = -b / a;
1426 if (-c * a + b * b + 1 > 0) {
1427 if (1.0/(curvature * curvature) - (x - x0) * (x - x0) > 0.0) {
1428 Double_t yderiv = (x - x0) / TMath::Sqrt(1.0/(curvature * curvature) - (x - x0) * (x - x0));
1429 if (a < 0) yderiv *= -1.0;
1433 z = offset + slope * (x - xref);
1435 tracklets[iLayer].SetYref(0, y);
1436 tracklets[iLayer].SetYref(1, dy);
1437 tracklets[iLayer].SetZref(0, z);
1438 tracklets[iLayer].SetZref(1, dz);
1439 tracklets[iLayer].SetC(curvature);
1440 tracklets[iLayer].SetCovRef(cov);
1441 tracklets[iLayer].SetChi2(chi2track);
1443 if(AliLog::GetDebugLevel("TRD", "AliTRDtrackerV1")>3) printf("D-AliTRDtrackerV1::FitTiltedRieman: Chi2[%f] C[%5.2e] pt[%8.3f]\n", chi2track, curvature, GetBz()*kB2C/curvature);
1445 /* if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) >=5){
1446 TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
1447 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
1448 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
1449 Double_t chi2z = CalculateChi2Z(tracklets, offset, slope, xref);
1450 cstreamer << "FitTiltedRieman0"
1451 << "EventNumber=" << eventNumber
1452 << "CandidateNumber=" << candidateNumber
1454 << "Chi2Z=" << chi2z
1461 //____________________________________________________________________
1462 Double_t AliTRDtrackerV1::FitLine(const AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t err, Int_t np, AliTrackPoint *points)
1465 // Fit track with a staight line
1466 // Fills an AliTrackPoint array with np points
1467 // Function should be used to refit tracks when no magnetic field was on
1469 AliTRDLeastSquare yfitter, zfitter;
1470 AliTRDcluster *cl = NULL;
1472 AliTRDseedV1 work[kNPlanes], *tracklet = NULL;
1474 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1475 if(!(tracklet = track->GetTracklet(ipl))) continue;
1476 if(!tracklet->IsOK()) continue;
1477 new(&work[ipl]) AliTRDseedV1(*tracklet);
1479 tracklets = &work[0];
1482 Double_t xref = CalculateReferenceX(tracklets);
1483 Double_t x, y, z, dx, ye, yr, tilt;
1484 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1485 if(!tracklets[ipl].IsOK()) continue;
1486 for(Int_t itb = 0; itb < fgNTimeBins; itb++){
1487 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1488 if (!tracklets[ipl].IsUsable(itb)) continue;
1492 zfitter.AddPoint(&dx, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
1496 Double_t z0 = zfitter.GetFunctionParameter(0);
1497 Double_t dzdx = zfitter.GetFunctionParameter(1);
1498 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1499 if(!tracklets[ipl].IsOK()) continue;
1500 for(Int_t itb = 0; itb < fgNTimeBins; itb++){
1501 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1502 if (!tracklets[ipl].IsUsable(itb)) continue;
1506 tilt = tracklets[ipl].GetTilt();
1508 yr = y + tilt*(z - z0 - dzdx*dx);
1509 // error definition changes for the different calls
1510 ye = tilt*TMath::Sqrt(cl->GetSigmaZ2());
1511 ye += err ? tracklets[ipl].GetSigmaY() : 0.2;
1512 yfitter.AddPoint(&dx, yr, ye);
1516 Double_t y0 = yfitter.GetFunctionParameter(0);
1517 Double_t dydx = yfitter.GetFunctionParameter(1);
1518 Double_t chi2 = 0.;//yfitter.GetChisquare()/Double_t(nPoints);
1520 //update track points array
1523 for(int ip=0; ip<np; ip++){
1524 points[ip].GetXYZ(xyz);
1525 xyz[1] = y0 + dydx * (xyz[0] - xref);
1526 xyz[2] = z0 + dzdx * (xyz[0] - xref);
1527 points[ip].SetXYZ(xyz);
1534 //_________________________________________________________________________
1535 Double_t AliTRDtrackerV1::FitRiemanTilt(const AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t sigError, Int_t np, AliTrackPoint *points)
1538 // Performs a Riemann fit taking tilting pad correction into account
1540 // Paramters: - Array of tracklets (connected to the track candidate)
1541 // - Flag selecting the error definition
1542 // Output: - Chi2 values of the track (in Parameter list)
1544 // The equations which has to be solved simultaneously are:
1546 // R^{2} = (x-x_{0})^{2} + (y^{*}-y_{0})^{2}
1547 // y^{*} = y - tg(h)(z - z_{t})
1548 // z_{t} = z_{0}+dzdx*(x-x_{r})
1550 // with (x, y, z) the coordinate of the cluster, (x_0, y_0, z_0) the coordinate of the center of the Riemann circle,
1551 // R its radius, x_r a constant refrence radial position in the middle of the TRD stack and dzdx the slope of the
1552 // track in the x-z plane. Using the following transformations
1554 // t = 1 / (x^{2} + y^{2})
1556 // v = 2 * tan(h) * t
1557 // w = 2 * tan(h) * (x - x_{r}) * t
1559 // One gets the following linear equation
1561 // a + b * u + c * t + d * v + e * w = 2 * (y + tg(h) * z) * t
1563 // where the coefficients have the following meaning
1567 // c = (R^{2} -x_{0}^{2} - y_{0}^{2})/y_{0}
1571 // The error calculation for the free term is thus
1573 // #sigma = 2 * #sqrt{#sigma^{2}_{y} + (tilt corr ...) + tg^{2}(h) * #sigma^{2}_{z}} * t
1576 // From this simple model one can compute chi^2 estimates and a rough approximation of pt from the curvature according
1579 // C = 1/R = a/(1 + b^{2} + c*a)
1583 // M.Ivanov <M.Ivanov@gsi.de>
1584 // A.Bercuci <A.Bercuci@gsi.de>
1585 // M.Fasel <M.Fasel@gsi.de>
1587 TLinearFitter *fitter = GetTiltedRiemanFitter();
1588 fitter->StoreData(kTRUE);
1589 fitter->ClearPoints();
1590 AliTRDLeastSquare zfitter;
1591 AliTRDcluster *cl = NULL;
1593 AliTRDseedV1 work[kNPlanes], *tracklet = NULL;
1595 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1596 if(!(tracklet = track->GetTracklet(ipl))) continue;
1597 if(!tracklet->IsOK()) continue;
1598 new(&work[ipl]) AliTRDseedV1(*tracklet);
1600 tracklets = &work[0];
1603 Double_t xref = CalculateReferenceX(tracklets);
1604 if(AliLog::GetDebugLevel("TRD", "AliTRDtrackerV1")>3) printf("D-AliTRDtrackerV1::FitRiemanTilt:\nx0[(0)%6.2f (1)%6.2f (2)%6.2f (3)%6.2f (4)%6.2f (5)%6.2f] xref[%6.2f]", tracklets[0].GetX0(), tracklets[1].GetX0(), tracklets[2].GetX0(), tracklets[3].GetX0(), tracklets[4].GetX0(), tracklets[5].GetX0(), xref);
1605 Double_t x, y, z, t, tilt, dx, w, we;
1608 // Containers for Least-square fitter
1609 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1610 if(!tracklets[ipl].IsOK()) continue;
1611 for(Int_t itb = 0; itb < AliTRDseedV1::kNclusters; itb++){
1612 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1613 //if (!tracklets[ipl].IsUsable(itb)) continue;
1617 tilt = tracklets[ipl].GetTilt();
1621 uvt[0] = 2. * x * t;
1623 uvt[2] = 2. * tilt * t;
1624 uvt[3] = 2. * tilt * dx * t;
1625 w = 2. * (y + tilt*z) * t;
1626 // error definition changes for the different calls
1628 we *= sigError ? TMath::Sqrt(cl->GetSigmaY2()) : 0.2;
1629 fitter->AddPoint(uvt, w, we);
1630 zfitter.AddPoint(&x, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
1634 if(fitter->Eval()) return 1.E10;
1636 Double_t z0 = fitter->GetParameter(3);
1637 Double_t dzdx = fitter->GetParameter(4);
1640 // Linear fitter - not possible to make boundaries
1641 // Do not accept non possible z and dzdx combinations
1642 Bool_t accept = kTRUE;
1643 Double_t zref = 0.0;
1644 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
1645 if(!tracklets[iLayer].IsOK()) continue;
1646 zref = z0 + dzdx * (tracklets[iLayer].GetX0() - xref);
1647 if (TMath::Abs(tracklets[iLayer].GetZfit(0) - zref) > tracklets[iLayer].GetPadLength() * 0.5 + 1.0)
1652 Double_t dzmf = zfitter.GetFunctionParameter(1);
1653 Double_t zmf = zfitter.GetFunctionValue(&xref);
1654 fitter->FixParameter(3, zmf);
1655 fitter->FixParameter(4, dzmf);
1657 fitter->ReleaseParameter(3);
1658 fitter->ReleaseParameter(4);
1659 z0 = fitter->GetParameter(3); // = zmf ?
1660 dzdx = fitter->GetParameter(4); // = dzmf ?
1663 // Calculate Curvature
1664 Double_t a = fitter->GetParameter(0);
1665 Double_t b = fitter->GetParameter(1);
1666 Double_t c = fitter->GetParameter(2);
1667 Double_t y0 = 1. / a;
1668 Double_t x0 = -b * y0;
1669 Double_t tmp = y0*y0 + x0*x0 - c*y0;
1670 if(tmp<=0.) return 1.E10;
1671 Double_t radius = TMath::Sqrt(tmp);
1672 Double_t curvature = 1.0 + b*b - c*a;
1673 if (curvature > 0.0) curvature = a / TMath::Sqrt(curvature);
1675 // Calculate chi2 of the fit
1676 Double_t chi2 = fitter->GetChisquare()/Double_t(nPoints);
1677 if(AliLog::GetDebugLevel("TRD", "AliTRDtrackerV1")>3) printf("D-AliTRDtrackerV1::FitRiemanTilt:x0[%6.2f] y0[%6.2f] R[%6.2f] chi2[%f]\n", x0, y0, radius, chi2);
1679 // Update the tracklets
1681 for(Int_t ip = 0; ip < kNPlanes; ip++) {
1682 x = tracklets[ip].GetX0();
1683 tmp = radius*radius-(x-x0)*(x-x0);
1684 if(tmp <= 0.) continue;
1685 tmp = TMath::Sqrt(tmp);
1687 // y: R^2 = (x - x0)^2 + (y - y0)^2
1688 // => y = y0 +/- Sqrt(R^2 - (x - x0)^2)
1689 tracklets[ip].SetYref(0, y0 - (y0>0.?1.:-1)*tmp);
1690 // => dy/dx = (x - x0)/Sqrt(R^2 - (x - x0)^2)
1691 tracklets[ip].SetYref(1, (x - x0) / tmp);
1692 tracklets[ip].SetZref(0, z0 + dzdx * (x - xref));
1693 tracklets[ip].SetZref(1, dzdx);
1694 tracklets[ip].SetC(curvature);
1695 tracklets[ip].SetChi2(chi2);
1698 //update track points array
1701 for(int ip=0; ip<np; ip++){
1702 points[ip].GetXYZ(xyz);
1703 xyz[1] = TMath::Abs(xyz[0] - x0) > radius ? 100. : y0 - (y0>0.?1.:-1.)*TMath::Sqrt((radius-(xyz[0]-x0))*(radius+(xyz[0]-x0)));
1704 xyz[2] = z0 + dzdx * (xyz[0] - xref);
1705 points[ip].SetXYZ(xyz);
1713 //____________________________________________________________________
1714 Double_t AliTRDtrackerV1::FitKalman(AliTRDtrackV1 *track, AliTRDseedV1 * const tracklets, Bool_t up, Int_t np, AliTrackPoint *points)
1716 // Kalman filter implementation for the TRD.
1717 // It returns the positions of the fit in the array "points"
1719 // Author : A.Bercuci@gsi.de
1721 // printf("Start track @ x[%f]\n", track->GetX());
1723 //prepare marker points along the track
1724 Int_t ip = np ? 0 : 1;
1726 if((up?-1:1) * (track->GetX() - points[ip].GetX()) > 0.) break;
1727 //printf("AliTRDtrackerV1::FitKalman() : Skip track marker x[%d] = %7.3f. Before track start ( %7.3f ).\n", ip, points[ip].GetX(), track->GetX());
1730 //if(points) printf("First marker point @ x[%d] = %f\n", ip, points[ip].GetX());
1733 AliTRDseedV1 tracklet;
1734 AliTRDseedV1 *ptrTracklet = NULL;
1736 //Loop through the TRD planes
1737 for (Int_t jplane = 0; jplane < kNPlanes; jplane++) {
1738 // GET TRACKLET OR BUILT IT
1739 Int_t iplane = up ? jplane : kNPlanes - 1 - jplane;
1741 if(!(ptrTracklet = &tracklets[iplane])) continue;
1743 if(!(ptrTracklet = track->GetTracklet(iplane))){
1744 /*AliTRDtrackerV1 *tracker = NULL;
1745 if(!(tracker = dynamic_cast<AliTRDtrackerV1*>( AliTRDrecoParam:Tracker()))) continue;
1746 ptrTracklet = new(&tracklet) AliTRDseedV1(iplane);
1747 if(!tracker->MakeTracklet(ptrTracklet, track)) */
1751 if(!ptrTracklet->IsOK()) continue;
1753 Double_t x = ptrTracklet->GetX0();
1756 //don't do anything if next marker is after next update point.
1757 if((up?-1:1) * (points[ip].GetX() - x) - AliTRDReconstructor::GetMaxStep() < 0) break;
1758 if(((up?-1:1) * (points[ip].GetX() - track->GetX()) < 0) && !PropagateToX(*track, points[ip].GetX(), AliTRDReconstructor::GetMaxStep())) return -1.;
1760 Double_t xyz[3]; // should also get the covariance
1762 track->Global2LocalPosition(xyz, track->GetAlpha());
1763 points[ip].SetXYZ(xyz[0], xyz[1], xyz[2]);
1766 // printf("plane[%d] tracklet[%p] x[%f]\n", iplane, ptrTracklet, x);
1768 // Propagate closer to the next update point
1769 if(((up?-1:1) * (x - track->GetX()) + AliTRDReconstructor::GetMaxStep() < 0) && !PropagateToX(*track, x + (up?-1:1)*AliTRDReconstructor::GetMaxStep(), AliTRDReconstructor::GetMaxStep())) return -1.;
1771 if(!AdjustSector(track)) return -1;
1772 if(TMath::Abs(track->GetSnp()) > AliTRDReconstructor::GetMaxSnp()) return -1;
1774 //load tracklet to the tracker and the track
1776 if((index = FindTracklet(ptrTracklet)) < 0){
1777 ptrTracklet = SetTracklet(&tracklet);
1778 index = fTracklets->GetEntriesFast()-1;
1780 track->SetTracklet(ptrTracklet, index);*/
1783 // register tracklet to track with tracklet creation !!
1784 // PropagateBack : loaded tracklet to the tracker and update index
1785 // RefitInward : update index
1786 // MakeTrack : loaded tracklet to the tracker and update index
1787 if(!tracklets) track->SetTracklet(ptrTracklet, -1);
1790 //Calculate the mean material budget along the path inside the chamber
1791 Double_t xyz0[3]; track->GetXYZ(xyz0);
1792 Double_t alpha = track->GetAlpha();
1793 Double_t xyz1[3], y, z;
1794 if(!track->GetProlongation(x, y, z)) return -1;
1795 xyz1[0] = x * TMath::Cos(alpha) - y * TMath::Sin(alpha);
1796 xyz1[1] = +x * TMath::Sin(alpha) + y * TMath::Cos(alpha);
1798 if(TMath::Abs(xyz0[0] - xyz1[0]) < 1e-3 && TMath::Abs(xyz0[1] - xyz1[1]) < 1e-3) continue; // check wheter we are at the same global x position
1800 if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param) <=0.) break;
1801 Double_t xrho = param[0]*param[4]; // density*length
1802 Double_t xx0 = param[1]; // radiation length
1804 //Propagate the track
1805 track->PropagateTo(x, xx0, xrho);
1806 if (!AdjustSector(track)) break;
1809 Double_t cov[3]; ptrTracklet->GetCovAt(x, cov);
1810 Double_t p[2] = { ptrTracklet->GetY(), ptrTracklet->GetZ()};
1811 Double_t chi2 = ((AliExternalTrackParam*)track)->GetPredictedChi2(p, cov);
1812 if(chi2<1e+10) ((AliExternalTrackParam*)track)->Update(p, cov);
1815 //Reset material budget if 2 consecutive gold
1816 if(iplane>0 && track->GetTracklet(iplane-1) && ptrTracklet->GetN() + track->GetTracklet(iplane-1)->GetN() > 20) track->SetBudget(2, 0.);
1817 } // end planes loop
1821 if(((up?-1:1) * (points[ip].GetX() - track->GetX()) < 0) && !PropagateToX(*track, points[ip].GetX(), AliTRDReconstructor::GetMaxStep())) return -1.;
1823 Double_t xyz[3]; // should also get the covariance
1825 track->Global2LocalPosition(xyz, track->GetAlpha());
1826 points[ip].SetXYZ(xyz[0], xyz[1], xyz[2]);
1830 return track->GetChi2();
1833 //_________________________________________________________________________
1834 Float_t AliTRDtrackerV1::CalculateChi2Z(const AliTRDseedV1 *tracklets, Double_t offset, Double_t slope, Double_t xref)
1837 // Calculates the chi2-value of the track in z-Direction including tilting pad correction.
1838 // A linear dependence on the x-value serves as a model.
1839 // The parameters are related to the tilted Riemann fit.
1840 // Parameters: - Array of tracklets (AliTRDseedV1) related to the track candidate
1841 // - the offset for the reference x
1843 // - the reference x position
1844 // Output: - The Chi2 value of the track in z-Direction
1846 Float_t chi2Z = 0, nLayers = 0;
1847 for (Int_t iLayer = 0; iLayer < AliTRDgeometry::kNlayer; iLayer++) {
1848 if(!tracklets[iLayer].IsOK()) continue;
1849 Double_t z = offset + slope * (tracklets[iLayer].GetX0() - xref);
1850 chi2Z += TMath::Abs(tracklets[iLayer].GetZfit(0) - z);
1853 chi2Z /= TMath::Max((nLayers - 3.0),1.0);
1857 //_____________________________________________________________________________
1858 Int_t AliTRDtrackerV1::PropagateToX(AliTRDtrackV1 &t, Double_t xToGo, Double_t maxStep)
1861 // Starting from current X-position of track <t> this function
1862 // extrapolates the track up to radial position <xToGo>.
1863 // Returns 1 if track reaches the plane, and 0 otherwise
1866 // Current track X-position
1867 Double_t xpos = t.GetX()/*,
1868 mass = t.GetMass()*/;
1870 // Direction: inward or outward
1871 Double_t dir = (xpos < xToGo) ? 1.0 : -1.0;
1873 while (((xToGo - xpos) * dir) > AliTRDReconstructor::GetEpsilon()) {
1874 // printf("to go %f\n", (xToGo - xpos) * dir);
1882 // The next step size
1883 Double_t step = dir * TMath::Min(TMath::Abs(xToGo-xpos),maxStep);
1885 // Get the global position of the starting point
1888 // X-position after next step
1891 // Get local Y and Z at the X-position of the next step
1892 if(t.GetProlongation(x,y,z)<0) return 0; // No prolongation possible
1894 // The global position of the end point of this prolongation step
1895 xyz1[0] = x * TMath::Cos(t.GetAlpha()) - y * TMath::Sin(t.GetAlpha());
1896 xyz1[1] = +x * TMath::Sin(t.GetAlpha()) + y * TMath::Cos(t.GetAlpha());
1899 // Calculate the mean material budget between start and
1900 // end point of this prolongation step
1901 if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param)<=0.) return 0;
1903 // Propagate the track to the X-position after the next step
1904 if (!t.PropagateTo(x, param[1], param[0]*param[4])) return 0;
1906 /* // Correct for mean material budget
1908 bg(TMath::Abs(t.GetP()/mass));
1909 if(AliLog::GetDebugLevel("TRD", "AliTRDtrackerV1")>=3){
1910 const char *pn[] = {"rho", "x/X0", "<A>", "<Z>", "L", "<Z/A>", "Nb"};
1911 printf("D-AliTRDtrackerV1::PropagateTo(): x[%6.2f] bg[%6.2f]\n", xpos, bg);
1912 printf(" param :: %s[%e] %s[%e] %s[%e] %s[%e] %s[%e] %s[%e] %s[%e]\n"
1923 dEdx = AliExternalTrackParam::BetheBlochSolid(bg);
1926 dEdx = AliExternalTrackParam::BetheBlochGas(bg);
1929 { // mean exitation energy (GeV)
1930 Double_t mee = ((param[3] < 13.) ? (12. * param[3] + 7.) : (9.76 * param[3] + 58.8 * TMath::Power(param[3],-0.19))) * 1.e-9;
1931 Double_t mZA = param[5]>1.e-5?param[5]:(param[3]/param[2]);
1932 if(AliLog::GetDebugLevel("TRD", "AliTRDtrackerV1")>=3) printf("D-AliTRDtrackerV1::PropagateTo(): Mee[%e] <Z/A>[%e]\n", mee, mZA);
1933 // protect against failed calculation of rho in MeanMaterialBudget()
1934 dEdx = AliExternalTrackParam::BetheBlochGeant(bg, param[0]>1.e-6?param[0]:2.33, 0.2, 3., mee, mZA);
1938 if(AliLog::GetDebugLevel("TRD", "AliTRDtrackerV1")>=2) printf("D-AliTRDtrackerV1::PropagateTo(): dEdx(bg=%e, m=%e)= %e[GeV/cm]\n", bg, mass, dEdx);
1939 if (!t.CorrectForMeanMaterialdEdx(param[1], dir*param[0]*param[4], mass, dEdx)) return 0;
1941 // Rotate the track if necessary
1942 if(!AdjustSector(&t)) return 0;
1944 // New track X-position
1953 //_____________________________________________________________________________
1954 Bool_t AliTRDtrackerV1::ReadClusters(TTree *clusterTree)
1957 // Reads AliTRDclusters from the file.
1958 // The names of the cluster tree and branches
1959 // should match the ones used in AliTRDclusterizer::WriteClusters()
1962 Int_t nsize = Int_t(clusterTree->GetTotBytes() / (sizeof(AliTRDcluster)));
1963 TObjArray *clusterArray = new TObjArray(nsize+1000);
1965 TBranch *branch = clusterTree->GetBranch("TRDcluster");
1967 AliError("Can't get the branch !");
1970 branch->SetAddress(&clusterArray);
1973 Float_t nclusters = fkRecoParam->GetNClusters();
1974 if(fkReconstructor->IsHLT()) nclusters /= AliTRDgeometry::kNsector;
1975 fClusters = new TClonesArray("AliTRDcluster", Int_t(nclusters));
1976 fClusters->SetOwner(kTRUE);
1978 AliInfo(Form("Tracker owning clusters @ %p", (void*)fClusters));
1981 // Loop through all entries in the tree
1982 Int_t nEntries = (Int_t) clusterTree->GetEntries();
1985 AliTRDcluster *c = NULL;
1986 for (Int_t iEntry = 0; iEntry < nEntries; iEntry++) {
1988 nbytes += clusterTree->GetEvent(iEntry);
1990 // Get the number of points in the detector
1991 Int_t nCluster = clusterArray->GetEntriesFast();
1992 for (Int_t iCluster = 0; iCluster < nCluster; iCluster++) {
1993 if(!(c = (AliTRDcluster *) clusterArray->UncheckedAt(iCluster))) continue;
1994 new((*fClusters)[ncl++]) AliTRDcluster(*c);
1995 delete (clusterArray->RemoveAt(iCluster));
1998 delete clusterArray;
2003 //_____________________________________________________________________________
2004 Int_t AliTRDtrackerV1::LoadClusters(TTree *cTree)
2007 // Fills clusters into TRD tracking sectors
2010 fkRecoParam = fkReconstructor->GetRecoParam(); // load reco param for this event
2012 // if(!fkReconstructor->IsWritingClusters()) AliInfo(Form("IsWritingClusters[%c]", fkReconstructor->IsWritingClusters()?'y':'n'));
2013 if(!(fClusters = AliTRDReconstructor::GetClusters())){
2014 AliWarning("Clusters unavailable from TRD reconstructor. Trying reading from tree ...");
2016 if(!ReadClusters(cTree)) {
2017 AliError("Reading clusters from tree failed.");
2022 if(!fClusters || !fClusters->GetEntriesFast()){
2023 AliInfo("No TRD clusters");
2025 } else AliInfo(Form("Using :: clusters[%d] onl.tracklets[%d] onl.tracks[%d]",
2026 fClusters?fClusters->GetEntriesFast():0,
2027 AliTRDReconstructor::GetTracklets()?AliTRDReconstructor::GetTracklets()->GetEntriesFast():0,
2028 AliTRDReconstructor::GetTracks()?AliTRDReconstructor::GetTracks()->GetEntriesFast():0));
2030 BuildTrackingContainers();
2035 //_____________________________________________________________________________
2036 Int_t AliTRDtrackerV1::LoadClusters(TClonesArray * const clusters)
2039 // Fills clusters into TRD tracking sectors
2040 // Function for use in the HLT
2042 if(!clusters || !clusters->GetEntriesFast()){
2043 AliInfo("No TRD clusters");
2045 } else AliInfo(Form("Using :: external.clusters[%d]", clusters->GetEntriesFast()));
2048 fClusters = clusters;
2050 fkRecoParam = fkReconstructor->GetRecoParam(); // load reco param for this event
2051 BuildTrackingContainers();
2057 //____________________________________________________________________
2058 Int_t AliTRDtrackerV1::BuildTrackingContainers()
2060 // Building tracking containers for clusters
2062 Int_t nin(0), ncl(fClusters->GetEntriesFast());
2064 AliTRDcluster *c = (AliTRDcluster *) fClusters->UncheckedAt(ncl);
2065 if(c->IsInChamber()) nin++;
2066 if(fkReconstructor->IsHLT()) c->SetRPhiMethod(AliTRDcluster::kCOG);
2067 Int_t detector = c->GetDetector();
2068 Int_t sector = fGeom->GetSector(detector);
2069 Int_t stack = fGeom->GetStack(detector);
2070 Int_t layer = fGeom->GetLayer(detector);
2072 fTrSec[sector].GetChamber(stack, layer, kTRUE)->InsertCluster(c, ncl);
2075 for(int isector =0; isector<AliTRDgeometry::kNsector; isector++){
2076 if(!fTrSec[isector].GetNChambers()) continue;
2077 fTrSec[isector].Init(fkReconstructor);
2085 //____________________________________________________________________
2086 void AliTRDtrackerV1::UnloadClusters()
2089 // Clears the arrays of clusters and tracks. Resets sectors and timebins
2090 // If option "force" is also set the containers are also deleted. This is useful
2095 if(HasRemoveContainers()){delete fTracks; fTracks = NULL;}
2098 fTracklets->Delete();
2099 if(HasRemoveContainers()){delete fTracklets; fTracklets = NULL;}
2101 if(fClusters && IsClustersOwner()){
2102 AliInfo(Form("tracker[%p] clearing %d own clusters @ %p", (void*)this, fClusters->GetEntries(), (void*)fClusters));
2103 fClusters->Delete();
2105 // // save clusters array in the reconstructor for further use.
2106 // if(!fkReconstructor->IsWritingClusters()){
2107 // AliTRDReconstructor::SetClusters(fClusters);
2108 // SetClustersOwner(kFALSE);
2109 // } else AliTRDReconstructor::SetClusters(NULL);
2112 for (int i = 0; i < AliTRDgeometry::kNsector; i++) fTrSec[i].Clear();
2114 // Increment the Event Number
2115 AliTRDtrackerDebug::SetEventNumber(AliTRDtrackerDebug::GetEventNumber() + 1);
2118 // //____________________________________________________________________
2119 // void AliTRDtrackerV1::UseClusters(const AliKalmanTrack *t, Int_t) const
2121 // const AliTRDtrackV1 *track = dynamic_cast<const AliTRDtrackV1*>(t);
2122 // if(!track) return;
2124 // AliTRDseedV1 *tracklet = NULL;
2125 // for(Int_t ily=AliTRDgeometry::kNlayer; ily--;){
2126 // if(!(tracklet = track->GetTracklet(ily))) continue;
2127 // AliTRDcluster *c = NULL;
2128 // for(Int_t ic=AliTRDseed::kNclusters; ic--;){
2129 // if(!(c=tracklet->GetClusters(ic))) continue;
2136 //_____________________________________________________________________________
2137 Bool_t AliTRDtrackerV1::AdjustSector(AliTRDtrackV1 *const track)
2140 // Rotates the track when necessary
2143 Double_t alpha = AliTRDgeometry::GetAlpha();
2144 Double_t y = track->GetY();
2145 Double_t ymax = track->GetX()*TMath::Tan(0.5*alpha);
2148 if (!track->Rotate( alpha)) {
2152 else if (y < -ymax) {
2153 if (!track->Rotate(-alpha)) {
2163 //____________________________________________________________________
2164 AliTRDseedV1* AliTRDtrackerV1::GetTracklet(const AliTRDtrackV1 *const track, Int_t p, Int_t &idx)
2166 // Find tracklet for TRD track <track>
2175 // Detailed description
2177 idx = track->GetTrackletIndex(p);
2178 AliTRDseedV1 *tracklet = (idx<0) ? NULL : (AliTRDseedV1*)fTracklets->UncheckedAt(idx);
2183 //____________________________________________________________________
2184 AliTRDseedV1* AliTRDtrackerV1::SetTracklet(const AliTRDseedV1 * const tracklet)
2186 // Add this tracklet to the list of tracklets stored in the tracker
2189 // - tracklet : pointer to the tracklet to be added to the list
2192 // - the index of the new tracklet in the tracker tracklets list
2194 // Detailed description
2195 // Build the tracklets list if it is not yet created (late initialization)
2196 // and adds the new tracklet to the list.
2199 fTracklets = new TClonesArray("AliTRDseedV1", AliTRDgeometry::Nsector()*kMaxTracksStack);
2200 fTracklets->SetOwner(kTRUE);
2202 Int_t nentries = fTracklets->GetEntriesFast();
2203 return new ((*fTracklets)[nentries]) AliTRDseedV1(*tracklet);
2206 //____________________________________________________________________
2207 AliTRDtrackV1* AliTRDtrackerV1::SetTrack(const AliTRDtrackV1 * const track)
2209 // Add this track to the list of tracks stored in the tracker
2212 // - track : pointer to the track to be added to the list
2215 // - the pointer added
2217 // Detailed description
2218 // Build the tracks list if it is not yet created (late initialization)
2219 // and adds the new track to the list.
2222 fTracks = new TClonesArray("AliTRDtrackV1", AliTRDgeometry::Nsector()*kMaxTracksStack);
2223 fTracks->SetOwner(kTRUE);
2225 Int_t nentries = fTracks->GetEntriesFast();
2226 return new ((*fTracks)[nentries]) AliTRDtrackV1(*track);
2231 //____________________________________________________________________
2232 Int_t AliTRDtrackerV1::Clusters2TracksSM(Int_t sector, AliESDEvent *esd)
2235 // Steer tracking for one SM.
2238 // sector : Array of (SM) propagation layers containing clusters
2239 // esd : The current ESD event. On output it contains the also
2240 // the ESD (TRD) tracks found in this SM.
2243 // Number of tracks found in this TRD supermodule.
2245 // Detailed description
2247 // 1. Unpack AliTRDpropagationLayers objects for each stack.
2248 // 2. Launch stack tracking.
2249 // See AliTRDtrackerV1::Clusters2TracksStack() for details.
2250 // 3. Pack results in the ESD event.
2254 Int_t nChambers = 0;
2255 AliTRDtrackingChamber **stack = NULL, *chamber = NULL;
2256 for(int istack = 0; istack<AliTRDgeometry::kNstack; istack++){
2257 if(!(stack = fTrSec[sector].GetStack(istack))) continue;
2259 for(int ilayer=0; ilayer<AliTRDgeometry::kNlayer; ilayer++){
2260 if(!(chamber = stack[ilayer])) continue;
2261 if(chamber->GetNClusters() < fgNTimeBins * fkRecoParam->GetFindableClusters()) continue;
2263 //AliInfo(Form("sector %d stack %d layer %d clusters %d", sector, istack, ilayer, chamber->GetNClusters()));
2265 if(nChambers < 4) continue;
2266 //AliInfo(Form("Doing stack %d", istack));
2267 nTracks += Clusters2TracksStack(stack, fTracksESD);
2269 if(nTracks) AliDebug(2, Form("Number of tracks: SM_%02d[%d]", sector, nTracks));
2271 for(int itrack=0; itrack<nTracks; itrack++){
2272 AliESDtrack *esdTrack((AliESDtrack*)(fTracksESD->operator[](itrack)));
2273 Int_t id = esd->AddTrack(esdTrack);
2275 // set ESD id to stand alone TRD tracks
2276 if (fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 0){
2277 esdTrack=esd->GetTrack(id);
2278 TObject *o(NULL); Int_t ic(0);
2279 AliTRDtrackV1 *calibTrack(NULL);
2280 while((o = esdTrack->GetCalibObject(ic++))){
2281 if(!(calibTrack = dynamic_cast<AliTRDtrackV1*>(o))) continue;
2282 calibTrack->SetESDid(esdTrack->GetID());
2288 // Reset Track and Candidate Number
2289 AliTRDtrackerDebug::SetCandidateNumber(0);
2290 AliTRDtrackerDebug::SetTrackNumber(0);
2292 // delete ESD tracks in the array
2293 fTracksESD->Delete();
2297 //____________________________________________________________________
2298 Int_t AliTRDtrackerV1::Clusters2TracksStack(AliTRDtrackingChamber **stack, TClonesArray * const esdTrackList)
2301 // Make tracks in one TRD stack.
2304 // layer : Array of stack propagation layers containing clusters
2305 // esdTrackList : Array of ESD tracks found by the stand alone tracker.
2306 // On exit the tracks found in this stack are appended.
2309 // Number of tracks found in this stack.
2311 // Detailed description
2313 // 1. Find the 3 most useful seeding chambers. See BuildSeedingConfigs() for details.
2314 // 2. Steer AliTRDtrackerV1::MakeSeeds() for 3 seeding layer configurations.
2315 // See AliTRDtrackerV1::MakeSeeds() for more details.
2316 // 3. Arrange track candidates in decreasing order of their quality
2317 // 4. Classify tracks in 5 categories according to:
2318 // a) number of layers crossed
2320 // 5. Sign clusters by tracks in decreasing order of track quality
2321 // 6. Build AliTRDtrack out of seeding tracklets
2323 // 8. Build ESD track and register it to the output list
2326 AliTRDtrackingChamber *chamber = NULL;
2327 AliTRDtrackingChamber **ci = NULL;
2328 AliTRDseedV1 sseed[kMaxTracksStack*6]; // to be initialized
2329 Int_t pars[4]; // MakeSeeds parameters
2331 //Double_t alpha = AliTRDgeometry::GetAlpha();
2332 //Double_t shift = .5 * alpha;
2333 Int_t configs[kNConfigs];
2335 // Purge used clusters from the containers
2337 for(Int_t ic = kNPlanes; ic--; ci++){
2338 if(!(*ci)) continue;
2342 // Build initial seeding configurations
2343 Double_t quality = BuildSeedingConfigs(stack, configs);
2344 if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 10){
2345 AliInfo(Form("Plane config %d %d %d Quality %f"
2346 , configs[0], configs[1], configs[2], quality));
2350 // Initialize contors
2351 Int_t ntracks, // number of TRD track candidates
2352 ntracks1, // number of registered TRD tracks/iter
2353 ntracks2 = 0; // number of all registered TRD tracks in stack
2357 Int_t ic = 0; ci = &stack[0];
2358 while(ic<kNPlanes && !(*ci)){ic++; ci++;}
2359 if(!(*ci)) return ntracks2;
2360 Int_t istack = fGeom->GetStack((*ci)->GetDetector());
2363 // Loop over seeding configurations
2364 ntracks = 0; ntracks1 = 0;
2365 for (Int_t iconf = 0; iconf<fkRecoParam->GetNumberOfSeedConfigs(); iconf++) {
2366 pars[0] = configs[iconf];
2369 ntracks = MakeSeeds(stack, &sseed[6*ntracks], pars);
2370 //AliInfo(Form("Number of Tracks after iteration step %d: %d\n", iconf, ntracks));
2371 if(ntracks == kMaxTracksStack) break;
2373 AliDebug(2, Form("Candidate TRD tracks %d in iteration %d.", ntracks, fSieveSeeding));
2376 // Sort the seeds according to their quality
2377 Int_t sort[kMaxTracksStack+1];
2378 TMath::Sort(ntracks, fTrackQuality, sort, kTRUE);
2379 if(AliLog::GetDebugLevel("TRD", "AliTRDtrackerV1") > 2){
2380 AliDebug(3, "Track candidates classification:");
2381 for (Int_t it(0); it < ntracks; it++) {
2383 printf(" %2d idx[%d] Quality[%e]\n", it, jt, fTrackQuality[jt]);
2387 // Initialize number of tracks so far and logic switches
2388 Int_t ntracks0 = esdTrackList->GetEntriesFast();
2389 Bool_t signedTrack[kMaxTracksStack];
2390 Bool_t fakeTrack[kMaxTracksStack];
2391 for (Int_t i=0; i<ntracks; i++){
2392 signedTrack[i] = kFALSE;
2393 fakeTrack[i] = kFALSE;
2395 //AliInfo("Selecting track candidates ...");
2397 // Sieve clusters in decreasing order of track quality
2398 Int_t jSieve(0), rejectedCandidates(0);
2400 // Check track candidates
2401 rejectedCandidates=0;
2402 for (Int_t itrack = 0; itrack < ntracks; itrack++) {
2403 Int_t trackIndex = sort[itrack];
2404 if (signedTrack[trackIndex] || fakeTrack[trackIndex]) continue;
2406 // Calculate track parameters from tracklets seeds
2411 for (Int_t jLayer = 0; jLayer < kNPlanes; jLayer++) {
2412 Int_t jseed = kNPlanes*trackIndex+jLayer;
2413 sseed[jseed].UpdateUsed();
2414 if(!sseed[jseed].IsOK()) continue;
2415 // check if primary candidate
2416 if (TMath::Abs(sseed[jseed].GetYref(0) / sseed[jseed].GetX0()) < 0.158) findable++;
2417 ncl += sseed[jseed].GetN();
2418 nused += sseed[jseed].GetNUsed();
2422 // Filter duplicated tracks
2424 AliDebug(4, Form("REJECTED : %d idx[%d] quality[%e] tracklets[%d] usedClusters[%d]", itrack, trackIndex, fTrackQuality[trackIndex], nlayers, nused));
2425 fakeTrack[trackIndex] = kTRUE;
2428 if (ncl>0 && Float_t(nused)/ncl >= .25){
2429 AliDebug(4, Form("REJECTED : %d idx[%d] quality[%e] tracklets[%d] usedClusters[%d] used/ncl[%f]", itrack, trackIndex, fTrackQuality[trackIndex], nlayers, nused, Float_t(nused)/ncl));
2430 fakeTrack[trackIndex] = kTRUE;
2434 AliDebug(4, Form("Candidate[%d] Quality[%e] Tracklets[%d] Findable[%d] Ncl[%d] Nused[%d]", trackIndex, fTrackQuality[trackIndex], nlayers, findable, ncl, nused));
2437 Bool_t skip = kFALSE;
2439 case 0: // select 6 tracklets primary tracks, good quality
2440 if(nlayers > findable || nlayers < kNPlanes) {skip = kTRUE; break;}
2441 if(TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -5.){skip = kTRUE; break;}
2444 case 1: // select shorter primary tracks, good quality
2445 //if(findable<4){skip = kTRUE; break;}
2446 if(nlayers < findable){skip = kTRUE; break;}
2447 if(TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -4.){skip = kTRUE; break;}
2450 case 2: // select 6 tracklets secondary tracks
2451 if(nlayers < kNPlanes) { skip = kTRUE; break;}
2452 if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -6.0){skip = kTRUE; break;}
2455 case 3: // select shorter tracks, good quality
2456 if (nlayers<4){skip = kTRUE; break;}
2457 if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -5.){skip = kTRUE; break;}
2460 case 4: // select anything with at least 4 tracklets
2461 if (nlayers<4){skip = kTRUE; break;}
2462 //if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) - nused/(nlayers-3.0) < -15.0){skip = kTRUE; break;}
2466 rejectedCandidates++;
2467 AliDebug(4, Form("REJECTED : %d idx[%d] quality[%e] tracklets[%d] usedClusters[%d]", itrack, trackIndex, fTrackQuality[trackIndex], nlayers, nused));
2469 } else AliDebug(4, Form("ACCEPTED : %d idx[%d] quality[%e] tracklets[%d] usedClusters[%d]", itrack, trackIndex, fTrackQuality[trackIndex], nlayers, nused));
2471 signedTrack[trackIndex] = kTRUE;
2473 AliTRDseedV1 *lseed =&sseed[trackIndex*kNPlanes];
2474 AliTRDtrackV1 *track = MakeTrack(lseed);
2476 AliDebug(1, "Track building failed.");
2479 if(AliLog::GetDebugLevel("TRD", "AliTRDtrackerV1") > 1){
2480 Int_t ich = 0; while(!(chamber = stack[ich])) ich++;
2481 AliDebug(2, Form("Track pt=%7.2fGeV/c SM[%2d] Done.", track->Pt(), fGeom->GetSector(chamber->GetDetector())));
2485 if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 1 && fkReconstructor->IsDebugStreaming()){
2486 //AliInfo(Form("Track %d [%d] nlayers %d trackQuality = %e nused %d, yref = %3.3f", itrack, trackIndex, nlayers, fTrackQuality[trackIndex], nused, trackParams[1]));
2488 AliTRDseedV1 *dseed[6];
2489 for(Int_t iseed = AliTRDgeometry::kNlayer; iseed--;) dseed[iseed] = new AliTRDseedV1(lseed[iseed]);
2491 //Int_t eventNrInFile = esd->GetEventNumberInFile();
2492 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2493 Int_t trackNumber = AliTRDtrackerDebug::GetTrackNumber();
2494 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2495 TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
2496 cstreamer << "Clusters2TracksStack"
2497 << "EventNumber=" << eventNumber
2498 << "TrackNumber=" << trackNumber
2499 << "CandidateNumber=" << candidateNumber
2500 << "Iter=" << fSieveSeeding
2501 << "Like=" << fTrackQuality[trackIndex]
2502 << "S0.=" << dseed[0]
2503 << "S1.=" << dseed[1]
2504 << "S2.=" << dseed[2]
2505 << "S3.=" << dseed[3]
2506 << "S4.=" << dseed[4]
2507 << "S5.=" << dseed[5]
2509 << "NLayers=" << nlayers
2510 << "Findable=" << findable
2511 << "NUsed=" << nused
2516 AliESDtrack *esdTrack = new ((*esdTrackList)[ntracks0++]) AliESDtrack();
2517 esdTrack->UpdateTrackParams(track, AliESDtrack::kTRDout);
2518 esdTrack->SetLabel(track->GetLabel());
2519 track->UpdateESDtrack(esdTrack);
2520 // write ESD-friends if neccessary
2521 if (fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 0){
2522 AliTRDtrackV1 *calibTrack = new AliTRDtrackV1(*track);
2523 calibTrack->SetOwner();
2524 esdTrack->AddCalibObject(calibTrack);
2527 AliTRDtrackerDebug::SetTrackNumber(AliTRDtrackerDebug::GetTrackNumber() + 1);
2531 } while(jSieve<5 && rejectedCandidates); // end track candidates sieve
2532 if(!ntracks1) break;
2534 // increment counters
2535 ntracks2 += ntracks1;
2537 if(fkReconstructor->IsHLT()) break;
2540 // Rebuild plane configurations and indices taking only unused clusters into account
2541 quality = BuildSeedingConfigs(stack, configs);
2542 if(quality < 1.E-7) break; //fkReconstructor->GetRecoParam() ->GetPlaneQualityThreshold()) break;
2544 for(Int_t ip = 0; ip < kNPlanes; ip++){
2545 if(!(chamber = stack[ip])) continue;
2546 chamber->Build(fGeom);//Indices(fSieveSeeding);
2549 if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 10){
2550 AliInfo(Form("Sieve level %d Plane config %d %d %d Quality %f", fSieveSeeding, configs[0], configs[1], configs[2], quality));
2552 } while(fSieveSeeding<10); // end stack clusters sieve
2556 //AliInfo(Form("Registered TRD tracks %d in stack %d.", ntracks2, pars[1]));
2561 //___________________________________________________________________
2562 Double_t AliTRDtrackerV1::BuildSeedingConfigs(AliTRDtrackingChamber **stack, Int_t *configs)
2565 // Assign probabilities to chambers according to their
2566 // capability of producing seeds.
2570 // layers : Array of stack propagation layers for all 6 chambers in one stack
2571 // configs : On exit array of configuration indexes (see GetSeedingConfig()
2572 // for details) in the decreasing order of their seeding probabilities.
2576 // Return top configuration quality
2578 // Detailed description:
2580 // To each chamber seeding configuration (see GetSeedingConfig() for
2581 // the list of all configurations) one defines 2 quality factors:
2582 // - an apriori topological quality (see GetSeedingConfig() for details) and
2583 // - a data quality based on the uniformity of the distribution of
2584 // clusters over the x range (time bins population). See CookChamberQA() for details.
2585 // The overall chamber quality is given by the product of this 2 contributions.
2588 Double_t chamberQ[kNPlanes];memset(chamberQ, 0, kNPlanes*sizeof(Double_t));
2589 AliTRDtrackingChamber *chamber = NULL;
2590 for(int iplane=0; iplane<kNPlanes; iplane++){
2591 if(!(chamber = stack[iplane])) continue;
2592 chamberQ[iplane] = (chamber = stack[iplane]) ? chamber->GetQuality() : 0.;
2595 Double_t tconfig[kNConfigs];memset(tconfig, 0, kNConfigs*sizeof(Double_t));
2596 Int_t planes[] = {0, 0, 0, 0};
2597 for(int iconf=0; iconf<kNConfigs; iconf++){
2598 GetSeedingConfig(iconf, planes);
2599 tconfig[iconf] = fgTopologicQA[iconf];
2600 for(int iplane=0; iplane<4; iplane++) tconfig[iconf] *= chamberQ[planes[iplane]];
2603 TMath::Sort((Int_t)kNConfigs, tconfig, configs, kTRUE);
2604 // AliInfo(Form("q[%d] = %f", configs[0], tconfig[configs[0]]));
2605 // AliInfo(Form("q[%d] = %f", configs[1], tconfig[configs[1]]));
2606 // AliInfo(Form("q[%d] = %f", configs[2], tconfig[configs[2]]));
2608 return tconfig[configs[0]];
2611 //____________________________________________________________________
2612 Int_t AliTRDtrackerV1::MakeSeeds(AliTRDtrackingChamber **stack, AliTRDseedV1 * const sseed, const Int_t * const ipar)
2615 // Seed tracklets and build candidate TRD tracks. The procedure is used during barrel tracking to account for tracks which are
2616 // either missed by TPC prolongation or conversions inside the TRD volume.
2617 // For stand alone tracking the procedure is used to estimate all tracks measured by TRD.
2620 // layers : Array of stack propagation layers containing clusters
2621 // sseed : Array of empty tracklet seeds. On exit they are filled.
2622 // ipar : Control parameters:
2623 // ipar[0] -> seeding chambers configuration
2624 // ipar[1] -> stack index
2625 // ipar[2] -> number of track candidates found so far
2628 // Number of tracks candidates found.
2630 // The following steps are performed:
2631 // 1. Build seeding layers by collapsing all time bins from each of the four seeding chambers along the
2632 // radial coordinate. See AliTRDtrackingChamber::GetSeedingLayer() for details. The chambers selection for seeding
2633 // is described in AliTRDtrackerV1::Clusters2TracksStack().
2634 // 2. Using the seeding clusters from the seeding layer (step 1) build combinatorics using the following algorithm:
2635 // - for each seeding cluster in the lower seeding layer find
2636 // - all seeding clusters in the upper seeding layer inside a road defined by a given phi angle. The angle
2637 // is calculated on the minimum pt of tracks from vertex accesible to the stand alone tracker.
2638 // - for each pair of two extreme seeding clusters select middle upper cluster using roads defined externally by the
2640 // - select last seeding cluster as the nearest to the linear approximation of the track described by the first three
2641 // seeding clusters.
2642 // The implementation of road calculation and cluster selection can be found in the functions AliTRDchamberTimeBin::BuildCond()
2643 // and AliTRDchamberTimeBin::GetClusters().
2644 // 3. Helix fit of the seeding clusters set. (see AliTRDtrackerFitter::FitRieman(AliTRDcluster**)). No tilt correction is
2645 // performed at this level
2646 // 4. Initialize seeding tracklets in the seeding chambers.
2647 // 5. *Filter 0* Chi2 cut on the Y and Z directions. The threshold is set externally by the reco params.
2648 // 6. Attach (true) clusters to seeding tracklets (see AliTRDseedV1::AttachClusters()) and fit tracklet (see
2649 // AliTRDseedV1::Fit()). The number of used clusters used by current seeds should not exceed ... (25).
2650 // 7. *Filter 1* Check if all 4 seeding tracklets are correctly constructed.
2651 // 8. Helix fit of the clusters from the seeding tracklets with tilt correction. Refit tracklets using the new
2652 // approximation of the track.
2653 // 9. *Filter 2* Calculate likelihood of the track. (See AliTRDtrackerV1::CookLikelihood()). The following quantities are
2654 // checked against the Riemann fit:
2655 // - position resolution in y
2656 // - angular resolution in the bending plane
2657 // - likelihood of the number of clusters attached to the tracklet
2658 // 10. Extrapolation of the helix fit to the other 2 chambers *non seeding* chambers:
2659 // - Initialization of extrapolation tracklets with the fit parameters
2660 // - Attach clusters to extrapolated tracklets
2661 // - Helix fit of tracklets
2662 // 11. Improve seeding tracklets quality by reassigning clusters based on the last parameters of the track
2663 // See AliTRDtrackerV1::ImproveSeedQuality() for details.
2664 // 12. Helix fit of all 6 seeding tracklets and chi2 calculation
2665 // 13. Hyperplane fit and track quality calculation. See AliTRDtrackerFitter::FitHyperplane() for details.
2666 // 14. Cooking labels for tracklets. Should be done only for MC
2667 // 15. Register seeds.
2670 // Marian Ivanov <M.Ivanov@gsi.de>
2671 // Alexandru Bercuci <A.Bercuci@gsi.de>
2672 // Markus Fasel <M.Fasel@gsi.de>
2674 AliTRDtrackingChamber *chamber = NULL;
2675 AliTRDcluster *c[kNSeedPlanes] = {NULL, NULL, NULL, NULL}; // initilize seeding clusters
2676 AliTRDseedV1 *cseed = &sseed[0]; // initialize tracklets for first track
2677 Int_t ncl, mcl; // working variable for looping over clusters
2678 Int_t index[AliTRDchamberTimeBin::kMaxClustersLayer], jndex[AliTRDchamberTimeBin::kMaxClustersLayer];
2680 // chi2[0] = tracklet chi2 on the Z direction
2681 // chi2[1] = tracklet chi2 on the R direction
2684 // this should be data member of AliTRDtrack TODO
2685 // Double_t seedQuality[kMaxTracksStack];
2687 // unpack control parameters
2688 Int_t config = ipar[0];
2689 Int_t ntracks = ipar[1];
2690 Int_t istack = ipar[2];
2691 Int_t planes[kNSeedPlanes]; GetSeedingConfig(config, planes);
2692 Int_t planesExt[kNPlanes-kNSeedPlanes]; GetExtrapolationConfig(config, planesExt);
2695 // Init chambers geometry
2696 Double_t hL[kNPlanes]; // Tilting angle
2697 Float_t padlength[kNPlanes]; // pad lenghts
2698 Float_t padwidth[kNPlanes]; // pad widths
2699 AliTRDpadPlane *pp = NULL;
2700 for(int iplane=0; iplane<kNPlanes; iplane++){
2701 pp = fGeom->GetPadPlane(iplane, istack);
2702 hL[iplane] = TMath::Tan(TMath::DegToRad()*pp->GetTiltingAngle());
2703 padlength[iplane] = pp->GetLengthIPad();
2704 padwidth[iplane] = pp->GetWidthIPad();
2707 // Init anode wire position for chambers
2708 Double_t x0[kNPlanes], // anode wire position
2709 driftLength = .5*AliTRDgeometry::AmThick() - AliTRDgeometry::DrThick(); // drift length
2710 TGeoHMatrix *matrix = NULL;
2711 Double_t loc[] = {AliTRDgeometry::AnodePos(), 0., 0.};
2712 Double_t glb[] = {0., 0., 0.};
2713 AliTRDtrackingChamber **cIter = &stack[0];
2714 for(int iLayer=0; iLayer<kNPlanes; iLayer++,cIter++){
2715 if(!(*cIter)) continue;
2716 if(!(matrix = fGeom->GetClusterMatrix((*cIter)->GetDetector()))){
2717 x0[iLayer] = fgkX0[iLayer];
2720 matrix->LocalToMaster(loc, glb);
2721 x0[iLayer] = glb[0];
2724 AliDebug(2, Form("Making seeds Stack[%d] Config[%d] Tracks[%d]...", istack, config, ntracks));
2726 // Build seeding layers
2729 for(int isl=0; isl<kNSeedPlanes; isl++){
2730 if(!(chamber = stack[planes[isl]])) continue;
2731 if(!chamber->GetSeedingLayer(fSeedTB[isl], fGeom, fkReconstructor)) continue;
2734 if(nlayers < kNSeedPlanes) return ntracks;
2737 // Start finding seeds
2738 Double_t cond0[4], cond1[4], cond2[4];
2740 while((c[3] = (*fSeedTB[3])[icl++])){
2742 fSeedTB[0]->BuildCond(c[3], cond0, 0);
2743 fSeedTB[0]->GetClusters(cond0, index, ncl);
2744 //printf("Found c[3] candidates 0 %d\n", ncl);
2747 c[0] = (*fSeedTB[0])[index[jcl++]];
2749 Double_t dx = c[3]->GetX() - c[0]->GetX();
2750 Double_t dzdx = (c[3]->GetZ() - c[0]->GetZ())/dx;
2751 Double_t dydx = (c[3]->GetY() - c[0]->GetY())/dx;
2752 fSeedTB[1]->BuildCond(c[0], cond1, 1, dzdx, dydx);
2753 fSeedTB[1]->GetClusters(cond1, jndex, mcl);
2754 //printf("Found c[0] candidates 1 %d\n", mcl);
2758 c[1] = (*fSeedTB[1])[jndex[kcl++]];
2760 fSeedTB[2]->BuildCond(c[1], cond2, 2, dzdx, dydx);
2761 c[2] = fSeedTB[2]->GetNearestCluster(cond2);
2762 //printf("Found c[1] candidate 2 %p\n", c[2]);
2765 AliDebug(3, Form("Seeding clusters\n 0[%6.3f %6.3f %6.3f]\n 1[%6.3f %6.3f %6.3f]\n 2[%6.3f %6.3f %6.3f]\n 3[%6.3f %6.3f %6.3f].",
2766 c[0]->GetX(), c[0]->GetY(), c[0]->GetZ(),
2767 c[1]->GetX(), c[1]->GetY(), c[1]->GetZ(),
2768 c[2]->GetX(), c[2]->GetY(), c[2]->GetZ(),
2769 c[3]->GetX(), c[3]->GetY(), c[3]->GetZ()));
2771 for (Int_t il = 0; il < kNPlanes; il++) cseed[il].Reset();
2775 AliTRDseedV1 *tseed = &cseed[0];
2777 for(int iLayer=0; iLayer<kNPlanes; iLayer++, tseed++, cIter++){
2778 Int_t det = (*cIter) ? (*cIter)->GetDetector() : -1;
2779 tseed->SetDetector(det);
2780 tseed->SetTilt(hL[iLayer]);
2781 tseed->SetPadLength(padlength[iLayer]);
2782 tseed->SetPadWidth(padwidth[iLayer]);
2783 tseed->SetReconstructor(fkReconstructor);
2784 tseed->SetX0(det<0 ? fR[iLayer]+driftLength : x0[iLayer]);
2785 tseed->Init(GetRiemanFitter());
2786 tseed->SetStandAlone(kTRUE);
2789 Bool_t isFake = kFALSE;
2790 if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) >= 2 && fkReconstructor->IsDebugStreaming()){
2791 if (c[0]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
2792 if (c[1]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
2793 if (c[2]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
2796 for(Int_t l = 0; l < kNSeedPlanes; l++) xpos[l] = fSeedTB[l]->GetX();
2798 for(int il=0; il<4; il++) yref[il] = cseed[planes[il]].GetYref(0);
2799 Int_t ll = c[3]->GetLabel(0);
2800 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2801 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2802 AliRieman *rim = GetRiemanFitter();
2803 TTreeSRedirector &cs0 = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
2805 <<"EventNumber=" << eventNumber
2806 <<"CandidateNumber=" << candidateNumber
2807 <<"isFake=" << isFake
2808 <<"config=" << config
2810 <<"chi2z=" << chi2[0]
2811 <<"chi2y=" << chi2[1]
2812 <<"Y2exp=" << cond2[0]
2813 <<"Z2exp=" << cond2[1]
2814 <<"X0=" << xpos[0] //layer[sLayer]->GetX()
2815 <<"X1=" << xpos[1] //layer[sLayer + 1]->GetX()
2816 <<"X2=" << xpos[2] //layer[sLayer + 2]->GetX()
2817 <<"X3=" << xpos[3] //layer[sLayer + 3]->GetX()
2818 <<"yref0=" << yref[0]
2819 <<"yref1=" << yref[1]
2820 <<"yref2=" << yref[2]
2821 <<"yref3=" << yref[3]
2826 <<"Seed0.=" << &cseed[planes[0]]
2827 <<"Seed1.=" << &cseed[planes[1]]
2828 <<"Seed2.=" << &cseed[planes[2]]
2829 <<"Seed3.=" << &cseed[planes[3]]
2830 <<"RiemanFitter.=" << rim
2833 if(chi2[0] > fkRecoParam->GetChi2Z()/*7./(3. - sLayer)*//*iter*/){
2834 AliDebug(3, Form("Filter on chi2Z [%f].", chi2[0]));
2835 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2838 if(chi2[1] > fkRecoParam->GetChi2Y()/*1./(3. - sLayer)*//*iter*/){
2839 AliDebug(3, Form("Filter on chi2Y [%f].", chi2[1]));
2840 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2843 //AliInfo("Passed chi2 filter.");
2845 // try attaching clusters to tracklets
2847 AliTRDcluster *cl = NULL;
2848 for(int iLayer=0; iLayer<kNSeedPlanes; iLayer++){
2849 Int_t jLayer = planes[iLayer];
2850 Int_t nNotInChamber = 0;
2851 if(!cseed[jLayer].AttachClusters(stack[jLayer], kTRUE)) continue;
2852 if(/*fkReconstructor->IsHLT()*/kFALSE){
2853 cseed[jLayer].UpdateUsed();
2854 if(!cseed[jLayer].IsOK()) continue;
2856 cseed[jLayer].Fit();
2857 cseed[jLayer].UpdateUsed();
2858 cseed[jLayer].ResetClusterIter();
2859 while((cl = cseed[jLayer].NextCluster())){
2860 if(!cl->IsInChamber()) nNotInChamber++;
2862 //printf("clusters[%d], used[%d], not in chamber[%d]\n", cseed[jLayer].GetN(), cseed[jLayer].GetNUsed(), nNotInChamber);
2863 if(cseed[jLayer].GetN() - (cseed[jLayer].GetNUsed() + nNotInChamber) < 5) continue; // checking for Cluster which are not in chamber is a much stronger restriction on real data
2868 if(mlayers < kNSeedPlanes){
2869 AliDebug(2, Form("Found only %d tracklets out of %d. Skip.", mlayers, kNSeedPlanes));
2870 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2874 // temporary exit door for the HLT
2875 if(fkReconstructor->IsHLT()){
2876 // attach clusters to extrapolation chambers
2877 for(int iLayer=0; iLayer<kNPlanes-kNSeedPlanes; iLayer++){
2878 Int_t jLayer = planesExt[iLayer];
2879 if(!(chamber = stack[jLayer])) continue;
2880 if(!cseed[jLayer].AttachClusters(chamber, kTRUE)) continue;
2881 cseed[jLayer].Fit();
2883 //FitTiltedRiemanConstraint(&cseed[0], GetZ());
2884 fTrackQuality[ntracks] = 1.; // dummy value
2886 if(ntracks == kMaxTracksStack) return ntracks;
2892 // Update Seeds and calculate Likelihood
2893 // fit tracklets and cook likelihood
2894 Double_t chi2Vals[4];
2895 chi2Vals[0] = FitTiltedRieman(&cseed[0], kTRUE);
2896 for(int iLayer=0; iLayer<kNSeedPlanes; iLayer++){
2897 Int_t jLayer = planes[iLayer];
2898 cseed[jLayer].Fit(1);
2900 Double_t like = CookLikelihood(&cseed[0], planes); // to be checked
2902 if (TMath::Log(1.E-9 + like) < fkRecoParam->GetTrackLikelihood()){
2903 AliDebug(3, Form("Filter on likelihood %f[%e].", TMath::Log(1.E-9 + like), like));
2904 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2907 //AliInfo(Form("Passed likelihood %f[%e].", TMath::Log(1.E-9 + like), like));
2909 // book preliminry results
2910 //seedQuality[ntracks] = like;
2911 fSeedLayer[ntracks] = config;/*sLayer;*/
2913 // attach clusters to the extrapolation seeds
2915 for(int iLayer=0; iLayer<kNPlanes-kNSeedPlanes; iLayer++){
2916 Int_t jLayer = planesExt[iLayer];
2917 if(!(chamber = stack[jLayer])) continue;
2919 // fit extrapolated seed
2920 if ((jLayer == 0) && !(cseed[1].IsOK())) continue;
2921 if ((jLayer == 5) && !(cseed[4].IsOK())) continue;
2922 AliTRDseedV1 pseed = cseed[jLayer];
2923 if(!pseed.AttachClusters(chamber, kTRUE)) continue;
2925 cseed[jLayer] = pseed;
2926 chi2Vals[0] = FitTiltedRieman(cseed, kTRUE);
2927 cseed[jLayer].Fit(1);
2931 // AliInfo("Extrapolation done.");
2932 // Debug Stream containing all the 6 tracklets
2933 if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) >= 2 && fkReconstructor->IsDebugStreaming()){
2934 TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
2935 TLinearFitter *tiltedRieman = GetTiltedRiemanFitter();
2936 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2937 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2938 cstreamer << "MakeSeeds1"
2939 << "EventNumber=" << eventNumber
2940 << "CandidateNumber=" << candidateNumber
2941 << "S0.=" << &cseed[0]
2942 << "S1.=" << &cseed[1]
2943 << "S2.=" << &cseed[2]
2944 << "S3.=" << &cseed[3]
2945 << "S4.=" << &cseed[4]
2946 << "S5.=" << &cseed[5]
2947 << "FitterT.=" << tiltedRieman
2951 if(fkRecoParam->HasImproveTracklets()){
2952 if(!ImproveSeedQuality(stack, cseed, chi2Vals[0])){
2953 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2954 AliDebug(3, "ImproveSeedQuality() failed.");
2958 // do track fitting with vertex constraint
2959 if(fkRecoParam->IsVertexConstrained()) chi2Vals[1] = FitTiltedRiemanConstraint(&cseed[0], GetZ());
2960 else chi2Vals[1] = -1.;
2961 chi2Vals[2] = GetChi2Z(&cseed[0]);
2962 chi2Vals[3] = GetChi2Phi(&cseed[0]);
2964 // calculate track quality
2965 fTrackQuality[ntracks] = CalculateTrackLikelihood(&chi2Vals[0]);
2967 if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) >= 2 && fkReconstructor->IsDebugStreaming()){
2968 TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
2969 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2970 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2971 TLinearFitter *fitterTC = GetTiltedRiemanFitterConstraint();
2972 TLinearFitter *fitterT = GetTiltedRiemanFitter();
2974 for(Int_t iseed = 0; iseed < kNPlanes; iseed++){
2975 ncls += cseed[iseed].IsOK() ? cseed[iseed].GetN2() : 0;
2977 cstreamer << "MakeSeeds2"
2978 << "EventNumber=" << eventNumber
2979 << "CandidateNumber=" << candidateNumber
2980 << "Chi2TR=" << chi2Vals[0]
2981 << "Chi2TC=" << chi2Vals[1]
2982 << "Nlayers=" << mlayers
2983 << "NClusters=" << ncls
2985 << "S0.=" << &cseed[0]
2986 << "S1.=" << &cseed[1]
2987 << "S2.=" << &cseed[2]
2988 << "S3.=" << &cseed[3]
2989 << "S4.=" << &cseed[4]
2990 << "S5.=" << &cseed[5]
2991 << "FitterT.=" << fitterT
2992 << "FitterTC.=" << fitterTC
2995 if(AliLog::GetDebugLevel("TRD", "AliTRDtrackerV1")){
2996 Double_t pt[]={0., 0.};
2997 for(Int_t il(0); il<kNPlanes; il++){
2998 if(!cseed[il].IsOK()) continue;
2999 pt[0] = GetBz()*kB2C/cseed[il].GetC();
3000 pt[1] = GetBz()*kB2C/cseed[il].GetC(1);
3003 AliDebug(2, Form("Candidate[%2d] pt[%7.3f %7.3f] Q[%e]\n"
3004 " [0] x[%6.2f] n[%2d] nu[%d] OK[%c]\n"
3005 " [1] x[%6.2f] n[%2d] nu[%d] OK[%c]\n"
3006 " [2] x[%6.2f] n[%2d] nu[%d] OK[%c]\n"
3007 " [3] x[%6.2f] n[%2d] nu[%d] OK[%c]\n"
3008 " [4] x[%6.2f] n[%2d] nu[%d] OK[%c]\n"
3009 " [5] x[%6.2f] n[%2d] nu[%d] OK[%c]"
3010 , ntracks, pt[0], pt[1], fTrackQuality[ntracks]
3011 ,cseed[0].GetX(), cseed[0].GetN(), cseed[0].GetNUsed(), cseed[0].IsOK()?'y':'n'
3012 ,cseed[1].GetX(), cseed[1].GetN(), cseed[1].GetNUsed(), cseed[1].IsOK()?'y':'n'
3013 ,cseed[2].GetX(), cseed[2].GetN(), cseed[2].GetNUsed(), cseed[2].IsOK()?'y':'n'
3014 ,cseed[3].GetX(), cseed[3].GetN(), cseed[3].GetNUsed(), cseed[3].IsOK()?'y':'n'
3015 ,cseed[4].GetX(), cseed[4].GetN(), cseed[4].GetNUsed(), cseed[4].IsOK()?'y':'n'
3016 ,cseed[5].GetX(), cseed[5].GetN(), cseed[5].GetNUsed(), cseed[5].IsOK()?'y':'n'));
3019 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
3020 if(ntracks == kMaxTracksStack){
3021 AliWarning(Form("Number of seeds reached maximum allowed (%d) in stack.", kMaxTracksStack));
3032 //_____________________________________________________________________________
3033 AliTRDtrackV1* AliTRDtrackerV1::MakeTrack(AliTRDseedV1 * const tracklet)
3036 // Build a TRD track out of tracklet candidates
3039 // seeds : array of tracklets
3040 // params : array of track parameters as they are estimated by stand alone tracker. 7 elements.
3041 // [0] - radial position of the track at reference point
3042 // [1] - y position of the fit at [0]
3043 // [2] - z position of the fit at [0]
3044 // [3] - snp of the first tracklet
3045 // [4] - tgl of the first tracklet
3046 // [5] - curvature of the Riemann fit - 1/pt
3047 // [6] - sector rotation angle
3052 // Initialize the TRD track based on the parameters of the fit and a parametric covariance matrix
3053 // (diagonal with constant variance terms TODO - correct parameterization)
3055 // In case of HLT just register the tracklets in the tracker and return values of the Riemann fit. For the
3056 // offline case perform a full Kalman filter on the already found tracklets (see AliTRDtrackerV1::FollowBackProlongation()
3057 // for details). Do also MC label calculation and PID if propagation successfully.
3059 if(fkReconstructor->IsHLT()) FitTiltedRiemanConstraint(tracklet, 0);
3060 Double_t alpha = AliTRDgeometry::GetAlpha();
3061 Double_t shift = AliTRDgeometry::GetAlpha()/2.0;
3063 // find first good tracklet
3064 Int_t idx(0); while(idx<kNPlanes && !tracklet[idx].IsOK()) idx++;
3065 if(idx>2){ AliDebug(1, Form("Found suspect track start @ layer idx[%d]\n"
3066 " %c[0] x0[%f] n[%d] nu[%d] OK[%c]\n"
3067 " %c[1] x0[%f] n[%d] nu[%d] OK[%c]\n"
3068 " %c[2] x0[%f] n[%d] nu[%d] OK[%c]\n"
3069 " %c[3] x0[%f] n[%d] nu[%d] OK[%c]\n"
3070 " %c[4] x0[%f] n[%d] nu[%d] OK[%c]\n"
3071 " %c[5] x0[%f] n[%d] nu[%d] OK[%c]"
3073 ,idx==0?'*':' ', tracklet[0].GetX0(), tracklet[0].GetN(), tracklet[0].GetNUsed(), tracklet[0].IsOK()?'y':'n'
3074 ,idx==1?'*':' ', tracklet[1].GetX0(), tracklet[1].GetN(), tracklet[1].GetNUsed(), tracklet[1].IsOK()?'y':'n'
3075 ,idx==2?'*':' ', tracklet[2].GetX0(), tracklet[2].GetN(), tracklet[2].GetNUsed(), tracklet[2].IsOK()?'y':'n'
3076 ,idx==3?'*':' ', tracklet[3].GetX0(), tracklet[3].GetN(), tracklet[3].GetNUsed(), tracklet[3].IsOK()?'y':'n'
3077 ,idx==4?'*':' ', tracklet[4].GetX0(), tracklet[4].GetN(), tracklet[4].GetNUsed(), tracklet[4].IsOK()?'y':'n'
3078 ,idx==5?'*':' ', tracklet[5].GetX0(), tracklet[5].GetN(), tracklet[5].GetNUsed(), tracklet[5].IsOK()?'y':'n'));
3083 Double_t x(tracklet[idx].GetX0() - dx);
3084 // Build track parameters
3085 Double_t params[] = {
3086 tracklet[idx].GetYref(0) - dx*tracklet[idx].GetYref(1) // y
3087 ,tracklet[idx].GetZref(0) - dx*tracklet[idx].GetZref(1) // z
3088 ,TMath::Sin(TMath::ATan(tracklet[idx].GetYref(1))) // snp
3089 ,tracklet[idx].GetZref(1) / TMath::Sqrt(1. + tracklet[idx].GetYref(1) * tracklet[idx].GetYref(1)) // tgl
3090 ,tracklet[idx].GetC(fkReconstructor->IsHLT()?1:0) // curvature -> 1/pt
3092 Int_t sector(fGeom->GetSector(tracklet[idx].GetDetector()));
3095 c[ 0] = 0.2; // s^2_y
3096 c[ 1] = 0.0; c[ 2] = 2.0; // s^2_z
3097 c[ 3] = 0.0; c[ 4] = 0.0; c[ 5] = 0.02; // s^2_snp
3098 c[ 6] = 0.0; c[ 7] = 0.0; c[ 8] = 0.0; c[ 9] = 0.1; // s^2_tgl
3099 c[10] = 0.0; c[11] = 0.0; c[12] = 0.0; c[13] = 0.0; c[14] = params[4]*params[4]*0.01; // s^2_1/pt
3101 AliTRDtrackV1 track(tracklet, params, c, x, sector*alpha+shift);
3103 AliTRDseedV1 *ptrTracklet = NULL;
3105 // skip Kalman filter for HLT
3106 if(/*fkReconstructor->IsHLT()*/kFALSE){
3107 for (Int_t jLayer = 0; jLayer < AliTRDgeometry::kNlayer; jLayer++) {
3108 track.UnsetTracklet(jLayer);
3109 ptrTracklet = &tracklet[jLayer];
3110 if(!ptrTracklet->IsOK()) continue;
3111 if(TMath::Abs(ptrTracklet->GetYref(1) - ptrTracklet->GetYfit(1)) >= .2) continue; // check this condition with Marian
3112 ptrTracklet = SetTracklet(ptrTracklet);
3113 ptrTracklet->UseClusters();
3114 track.SetTracklet(ptrTracklet, fTracklets->GetEntriesFast()-1);
3116 AliTRDtrackV1 *ptrTrack = SetTrack(&track);
3117 ptrTrack->CookPID();
3118 ptrTrack->CookLabel(.9);
3119 ptrTrack->SetReconstructor(fkReconstructor);
3123 // prevent the error message in AliTracker::MeanMaterialBudget: "start point out of geometry"
3124 if(TMath::Abs(track.GetX()) + TMath::Abs(track.GetY()) + TMath::Abs(track.GetZ()) > 10000) return NULL;
3126 track.ResetCovariance(1);
3127 Int_t nc = TMath::Abs(FollowBackProlongation(track));
3128 if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 5 && fkReconstructor->IsDebugStreaming()){
3129 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
3130 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
3131 Double_t p[5]; // Track Params for the Debug Stream
3132 track.GetExternalParameters(x, p);
3133 TTreeSRedirector &cs = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
3135 << "EventNumber=" << eventNumber
3136 << "CandidateNumber=" << candidateNumber
3144 << "Yin=" << params[0]
3145 << "Zin=" << params[1]
3146 << "snpin=" << params[2]
3147 << "tndin=" << params[3]
3148 << "crvin=" << params[4]
3149 << "track.=" << &track
3153 UnsetTrackletsTrack(&track);
3156 AliTRDtrackV1 *ptrTrack = SetTrack(&track);
3157 ptrTrack->SetReconstructor(fkReconstructor);
3158 ptrTrack->CookLabel(.9);
3159 for(Int_t il(kNPlanes); il--;){
3160 if(!(ptrTracklet = ptrTrack->GetTracklet(il))) continue;
3161 ptrTracklet->UseClusters();
3164 // computes PID for track
3165 ptrTrack->CookPID();
3166 // update calibration references using this track
3167 AliTRDCalibraFillHisto *calibra = AliTRDCalibraFillHisto::Instance();
3169 AliInfo("Could not get Calibra instance.");
3170 } else if(calibra->GetHisto2d()){
3171 calibra->UpdateHistogramsV1(ptrTrack);
3177 //____________________________________________________________________
3178 Bool_t AliTRDtrackerV1::ImproveSeedQuality(AliTRDtrackingChamber **stack, AliTRDseedV1 *cseed, Double_t &chi2)
3181 // Sort tracklets according to "quality" and try to "improve" the first 4 worst
3184 // layers : Array of propagation layers for a stack/supermodule
3185 // cseed : Array of 6 seeding tracklets which has to be improved
3188 // cssed : Improved seeds
3190 // Detailed description
3192 // Iterative procedure in which new clusters are searched for each
3193 // tracklet seed such that the seed quality (see AliTRDseed::GetQuality())
3194 // can be maximized. If some optimization is found the old seeds are replaced.
3199 // make a local working copy
3200 AliTRDtrackingChamber *chamber = NULL;
3201 AliTRDseedV1 bseed[AliTRDgeometry::kNlayer];
3203 Float_t quality(1.e3),
3204 lQuality[AliTRDgeometry::kNlayer] = {1.e3, 1.e3, 1.e3, 1.e3, 1.e3, 1.e3};
3206 for(Int_t jLayer=AliTRDgeometry::kNlayer; jLayer--;){
3207 bseed[jLayer] = cseed[jLayer];
3208 if(!bseed[jLayer].IsOK()) continue;
3210 lQuality[jLayer] = bseed[jLayer].GetQuality(kTRUE);
3211 quality += lQuality[jLayer];
3216 AliDebug(2, Form("Start N[%d] Q[%f] chi2[%f]", rLayers, quality, chi2));
3218 for (Int_t iter = 0; iter < 4; iter++) {
3219 // Try better cluster set
3220 Int_t nLayers(0); Float_t qualitynew(0.);
3221 Int_t indexes[4*AliTRDgeometry::kNlayer];
3222 TMath::Sort(Int_t(AliTRDgeometry::kNlayer), lQuality, indexes, kFALSE);
3223 for(Int_t jLayer=AliTRDgeometry::kNlayer; jLayer--;) {
3224 Int_t bLayer = indexes[jLayer];
3225 bseed[bLayer].Reset("c");
3226 if(!(chamber = stack[bLayer])) continue;
3227 if(!bseed[bLayer].AttachClusters(chamber, kTRUE)) continue;
3228 bseed[bLayer].Fit(1);
3229 if(!bseed[bLayer].IsOK()) continue;
3231 lQuality[jLayer] = bseed[jLayer].GetQuality(kTRUE);
3232 qualitynew += lQuality[jLayer];
3234 if(rLayers > nLayers){
3235 AliDebug(1, Form("Lost %d tracklets while improving.", rLayers-nLayers));
3236 return iter>0?kTRUE:kFALSE;
3237 } else rLayers=nLayers;
3238 qualitynew /= rLayers;
3240 if(qualitynew > quality){
3241 AliDebug(4, Form("Quality[%f] worsen in iter[%d] to ref[%f].", qualitynew, iter, quality));
3242 return iter>0?kTRUE:kFALSE;
3243 } else quality = qualitynew;
3245 // try improve track parameters
3246 Float_t chi2new = FitTiltedRieman(bseed, kTRUE);
3248 AliDebug(4, Form("Chi2[%f] worsen in iter[%d] to ref[%f].", chi2new, iter, chi2));
3249 return iter>0?kTRUE:kFALSE;
3250 } else chi2 = chi2new;
3252 // store better tracklets
3253 for(Int_t jLayer=AliTRDgeometry::kNlayer; jLayer--;) cseed[jLayer]=bseed[jLayer];
3254 AliDebug(2, Form("Iter[%d] Q[%f] chi2[%f]", iter, quality, chi2));
3257 if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) >= 7 && fkReconstructor->IsDebugStreaming()){
3258 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
3259 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
3260 TLinearFitter *tiltedRieman = GetTiltedRiemanFitter();
3261 TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
3262 cstreamer << "ImproveSeedQuality"
3263 << "EventNumber=" << eventNumber
3264 << "CandidateNumber=" << candidateNumber
3265 << "Iteration=" << iter
3266 << "S0.=" << &cseed[0]
3267 << "S1.=" << &cseed[1]
3268 << "S2.=" << &cseed[2]
3269 << "S3.=" << &cseed[3]
3270 << "S4.=" << &cseed[4]
3271 << "S5.=" << &cseed[5]
3272 << "FitterT.=" << tiltedRieman
3277 // we are sure that at least 4 tracklets are OK !
3281 //_________________________________________________________________________
3282 Double_t AliTRDtrackerV1::CalculateTrackLikelihood(Double_t *chi2){
3284 // Calculates the Track Likelihood value. This parameter serves as main quality criterion for
3285 // the track selection
3286 // The likelihood value containes:
3287 // - The chi2 values from the both fitters and the chi2 values in z-direction from a linear fit
3288 // - The Sum of the Parameter |slope_ref - slope_fit|/Sigma of the tracklets
3289 // For all Parameters an exponential dependency is used
3291 // Parameters: - Array of tracklets (AliTRDseedV1) related to the track candidate
3292 // - Array of chi2 values:
3293 // * Non-Constrained Tilted Riemann fit
3294 // * Vertex-Constrained Tilted Riemann fit
3295 // * z-Direction from Linear fit
3296 // Output: - The calculated track likelihood
3301 // Non-constrained Tilted Riemann
3302 Double_t likeChi2TR = TMath::Exp(-chi2[0] * 0.0078);
3303 // Constrained Tilted Riemann
3304 Double_t likeChi2TC(1.);
3306 likeChi2TC = TMath::Exp(-chi2[1] * 0.677);
3307 Double_t r = likeChi2TC/likeChi2TR;
3308 if(r>1.e2){;} // -> a primary track use TC
3309 else if(r<1.e2) // -> a secondary track use TR
3311 else{;} // -> test not conclusive
3313 // Chi2 only on Z direction
3314 Double_t likeChi2Z = TMath::Exp(-chi2[2] * 0.14);
3315 // Chi2 angular resolution
3316 Double_t likeChi2Phi= TMath::Exp(-chi2[3] * 3.23);
3318 Double_t trackLikelihood = likeChi2Z * likeChi2TR * likeChi2TC * likeChi2Phi;
3320 AliDebug(2, Form("Likelihood [%e]\n"
3321 " Rieman : chi2[%f] likelihood[%6.2e]\n"
3322 " Vertex : chi2[%f] likelihood[%6.2e]\n"
3323 " Z : chi2[%f] likelihood[%6.2e]\n"
3324 " Phi : chi2[%f] likelihood[%6.2e]"
3326 , chi2[0], likeChi2TR
3327 , chi2[1], likeChi2TC
3328 , chi2[2], likeChi2Z
3329 , chi2[3], likeChi2Phi
3332 if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) >= 2 && fkReconstructor->IsDebugStreaming()){
3333 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
3334 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
3335 TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
3336 cstreamer << "CalculateTrackLikelihood0"
3337 << "EventNumber=" << eventNumber
3338 << "CandidateNumber=" << candidateNumber
3339 << "LikeChi2Z=" << likeChi2Z
3340 << "LikeChi2TR=" << likeChi2TR
3341 << "LikeChi2TC=" << likeChi2TC
3342 << "LikeChi2Phi=" << likeChi2Phi
3343 << "TrackLikelihood=" << trackLikelihood
3347 return trackLikelihood;
3350 //____________________________________________________________________
3351 Double_t AliTRDtrackerV1::CookLikelihood(AliTRDseedV1 *cseed, Int_t planes[4])
3354 // Calculate the probability of this track candidate.
3357 // cseeds : array of candidate tracklets
3358 // planes : array of seeding planes (see seeding configuration)
3359 // chi2 : chi2 values (on the Z and Y direction) from the rieman fit of the track.
3364 // Detailed description
3366 // The track quality is estimated based on the following 4 criteria:
3367 // 1. precision of the rieman fit on the Y direction (likea)
3368 // 2. chi2 on the Y direction (likechi2y)
3369 // 3. chi2 on the Z direction (likechi2z)
3370 // 4. number of attached clusters compared to a reference value
3371 // (see AliTRDrecoParam::fkFindable) (likeN)
3373 // The distributions for each type of probabilities are given below as of
3374 // (date). They have to be checked to assure consistency of estimation.
3377 // ratio of the total number of clusters/track which are expected to be found by the tracker.
3378 Double_t chi2y = GetChi2Y(&cseed[0]);
3379 Double_t chi2z = GetChi2Z(&cseed[0]);
3381 Float_t nclusters = 0.;
3382 Double_t sumda = 0.;
3383 for(UChar_t ilayer = 0; ilayer < 4; ilayer++){
3384 Int_t jlayer = planes[ilayer];
3385 nclusters += cseed[jlayer].GetN2();
3386 sumda += TMath::Abs(cseed[jlayer].GetYfit(1) - cseed[jlayer].GetYref(1));
3390 Double_t likea = TMath::Exp(-sumda * fkRecoParam->GetPhiSlope());
3391 Double_t likechi2y = 0.0000000001;
3392 if (fkReconstructor->IsCosmic() || chi2y < fkRecoParam->GetChi2YCut()) likechi2y += TMath::Exp(-TMath::Sqrt(chi2y) * fkRecoParam->GetChi2YSlope());
3393 Double_t likechi2z = TMath::Exp(-chi2z * fkRecoParam->GetChi2ZSlope());
3394 Double_t likeN = TMath::Exp(-(fkRecoParam->GetNMeanClusters() - nclusters) / fkRecoParam->GetNSigmaClusters());
3395 Double_t like = likea * likechi2y * likechi2z * likeN;
3397 if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) >= 2 && fkReconstructor->IsDebugStreaming()){
3398 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
3399 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
3400 Int_t nTracklets = 0; Float_t meanNcls = 0;
3401 for(Int_t iseed=0; iseed < kNPlanes; iseed++){
3402 if(!cseed[iseed].IsOK()) continue;
3404 meanNcls += cseed[iseed].GetN2();
3406 if(nTracklets) meanNcls /= nTracklets;
3407 // The Debug Stream contains the seed
3408 TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
3409 cstreamer << "CookLikelihood"
3410 << "EventNumber=" << eventNumber
3411 << "CandidateNumber=" << candidateNumber
3412 << "tracklet0.=" << &cseed[0]
3413 << "tracklet1.=" << &cseed[1]
3414 << "tracklet2.=" << &cseed[2]
3415 << "tracklet3.=" << &cseed[3]
3416 << "tracklet4.=" << &cseed[4]
3417 << "tracklet5.=" << &cseed[5]
3418 << "sumda=" << sumda
3419 << "chi2y=" << chi2y
3420 << "chi2z=" << chi2z
3421 << "likea=" << likea
3422 << "likechi2y=" << likechi2y
3423 << "likechi2z=" << likechi2z
3424 << "nclusters=" << nclusters
3425 << "likeN=" << likeN
3427 << "meanncls=" << meanNcls
3434 //____________________________________________________________________
3435 void AliTRDtrackerV1::GetSeedingConfig(Int_t iconfig, Int_t planes[4])
3438 // Map seeding configurations to detector planes.
3441 // iconfig : configuration index
3442 // planes : member planes of this configuration. On input empty.
3445 // planes : contains the planes which are defining the configuration
3447 // Detailed description
3449 // Here is the list of seeding planes configurations together with
3450 // their topological classification:
3468 // The topologic quality is modeled as follows:
3469 // 1. The general model is define by the equation:
3470 // p(conf) = exp(-conf/2)
3471 // 2. According to the topologic classification, configurations from the same
3472 // class are assigned the agerage value over the model values.
3473 // 3. Quality values are normalized.
3475 // The topologic quality distribution as function of configuration is given below:
3477 // <img src="gif/topologicQA.gif">
3482 case 0: // 5432 TQ 0
3488 case 1: // 4321 TQ 0
3494 case 2: // 3210 TQ 0
3500 case 3: // 5321 TQ 1
3506 case 4: // 4210 TQ 1
3512 case 5: // 5431 TQ 1
3518 case 6: // 4320 TQ 1
3524 case 7: // 5430 TQ 2
3530 case 8: // 5210 TQ 2
3536 case 9: // 5421 TQ 3
3542 case 10: // 4310 TQ 3
3548 case 11: // 5410 TQ 4
3554 case 12: // 5420 TQ 5
3560 case 13: // 5320 TQ 5
3566 case 14: // 5310 TQ 5
3575 //____________________________________________________________________
3576 void AliTRDtrackerV1::GetExtrapolationConfig(Int_t iconfig, Int_t planes[2])
3579 // Returns the extrapolation planes for a seeding configuration.
3582 // iconfig : configuration index
3583 // planes : planes which are not in this configuration. On input empty.
3586 // planes : contains the planes which are not in the configuration
3588 // Detailed description
3592 case 0: // 5432 TQ 0
3596 case 1: // 4321 TQ 0
3600 case 2: // 3210 TQ 0
3604 case 3: // 5321 TQ 1
3608 case 4: // 4210 TQ 1
3612 case 5: // 5431 TQ 1
3616 case 6: // 4320 TQ 1
3620 case 7: // 5430 TQ 2
3624 case 8: // 5210 TQ 2
3628 case 9: // 5421 TQ 3
3632 case 10: // 4310 TQ 3
3636 case 11: // 5410 TQ 4
3640 case 12: // 5420 TQ 5
3644 case 13: // 5320 TQ 5
3648 case 14: // 5310 TQ 5
3655 //____________________________________________________________________
3656 AliCluster* AliTRDtrackerV1::GetCluster(Int_t idx) const
3658 if(!fClusters) return NULL;
3659 Int_t ncls = fClusters->GetEntriesFast();
3660 return idx >= 0 && idx < ncls ? (AliCluster*)fClusters->UncheckedAt(idx) : NULL;
3663 //____________________________________________________________________
3664 AliTRDseedV1* AliTRDtrackerV1::GetTracklet(Int_t idx) const
3666 if(!fTracklets) return NULL;
3667 Int_t ntrklt = fTracklets->GetEntriesFast();
3668 return idx >= 0 && idx < ntrklt ? (AliTRDseedV1*)fTracklets->UncheckedAt(idx) : NULL;
3671 //____________________________________________________________________
3672 AliKalmanTrack* AliTRDtrackerV1::GetTrack(Int_t idx) const
3674 if(!fTracks) return NULL;
3675 Int_t ntrk = fTracks->GetEntriesFast();
3676 return idx >= 0 && idx < ntrk ? (AliKalmanTrack*)fTracks->UncheckedAt(idx) : NULL;
3681 // //_____________________________________________________________________________
3682 // Int_t AliTRDtrackerV1::Freq(Int_t n, const Int_t *inlist
3683 // , Int_t *outlist, Bool_t down)
3686 // // Sort eleements according occurancy
3687 // // The size of output array has is 2*n
3694 // Int_t *sindexS = new Int_t[n]; // Temporary array for sorting
3695 // Int_t *sindexF = new Int_t[2*n];
3696 // for (Int_t i = 0; i < n; i++) {
3700 // TMath::Sort(n,inlist,sindexS,down);
3702 // Int_t last = inlist[sindexS[0]];
3703 // Int_t val = last;
3705 // sindexF[0+n] = last;
3706 // Int_t countPos = 0;
3708 // // Find frequency
3709 // for (Int_t i = 1; i < n; i++) {
3710 // val = inlist[sindexS[i]];
3711 // if (last == val) {
3712 // sindexF[countPos]++;
3716 // sindexF[countPos+n] = val;
3717 // sindexF[countPos]++;
3721 // if (last == val) {
3725 // // Sort according frequency
3726 // TMath::Sort(countPos,sindexF,sindexS,kTRUE);
3728 // for (Int_t i = 0; i < countPos; i++) {
3729 // outlist[2*i ] = sindexF[sindexS[i]+n];
3730 // outlist[2*i+1] = sindexF[sindexS[i]];
3733 // delete [] sindexS;
3734 // delete [] sindexF;
3741 //____________________________________________________________________
3742 void AliTRDtrackerV1::ResetSeedTB()
3744 // reset buffer for seeding time bin layers. If the time bin
3745 // layers are not allocated this function allocates them
3747 for(Int_t isl=0; isl<kNSeedPlanes; isl++){
3748 if(!fSeedTB[isl]) fSeedTB[isl] = new AliTRDchamberTimeBin();
3749 else fSeedTB[isl]->Clear();
3754 //_____________________________________________________________________________
3755 Float_t AliTRDtrackerV1::GetChi2Y(const AliTRDseedV1 * const tracklets) const
3757 // Calculates normalized chi2 in y-direction
3758 // chi2 = Sum chi2 / n_tracklets
3760 Double_t chi2 = 0.; Int_t n = 0;
3761 for(Int_t ipl = kNPlanes; ipl--;){
3762 if(!tracklets[ipl].IsOK()) continue;
3763 chi2 += tracklets[ipl].GetChi2Y();
3766 return n ? chi2/n : 0.;
3769 //_____________________________________________________________________________
3770 Float_t AliTRDtrackerV1::GetChi2Z(const AliTRDseedV1 *const tracklets) const
3772 // Calculates normalized chi2 in z-direction
3773 // chi2 = Sum chi2 / n_tracklets
3775 Double_t chi2 = 0; Int_t n = 0;
3776 for(Int_t ipl = kNPlanes; ipl--;){
3777 if(!tracklets[ipl].IsOK()) continue;
3778 chi2 += tracklets[ipl].GetChi2Z();
3781 return n ? chi2/n : 0.;
3784 //_____________________________________________________________________________
3785 Float_t AliTRDtrackerV1::GetChi2Phi(const AliTRDseedV1 *const tracklets) const
3787 // Calculates normalized chi2 for angular resolution
3788 // chi2 = Sum chi2 / n_tracklets
3790 Double_t chi2 = 0; Int_t n = 0;
3791 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
3792 if(!tracklets[iLayer].IsOK()) continue;
3793 chi2 += tracklets[iLayer].GetChi2Phi();
3796 return n ? chi2/n: 0.;
3799 //____________________________________________________________________
3800 Float_t AliTRDtrackerV1::CalculateReferenceX(const AliTRDseedV1 *const tracklets){
3802 // Calculates the reference x-position for the tilted Rieman fit defined as middle
3803 // of the stack (middle between layers 2 and 3). For the calculation all the tracklets
3804 // are taken into account
3806 // Parameters: - Array of tracklets(AliTRDseedV1)
3808 // Output: - The reference x-position(Float_t)
3809 // Only kept for compatibility with the old code
3811 Int_t nDistances = 0;
3812 Float_t meanDistance = 0.;
3813 Int_t startIndex = 5;
3814 for(Int_t il =5; il > 0; il--){
3815 if(tracklets[il].IsOK() && tracklets[il -1].IsOK()){
3816 Float_t xdiff = tracklets[il].GetX0() - tracklets[il -1].GetX0();
3817 meanDistance += xdiff;
3820 if(tracklets[il].IsOK()) startIndex = il;
3822 if(tracklets[0].IsOK()) startIndex = 0;
3824 // We should normally never get here
3825 Float_t xpos[2]; memset(xpos, 0, sizeof(Float_t) * 2);
3826 Int_t iok = 0, idiff = 0;
3827 // This attempt is worse and should be avoided:
3828 // check for two chambers which are OK and repeat this without taking the mean value
3829 // Strategy avoids a division by 0;
3830 for(Int_t il = 5; il >= 0; il--){
3831 if(tracklets[il].IsOK()){
3832 xpos[iok] = tracklets[il].GetX0();
3836 if(iok) idiff++; // to get the right difference;
3840 meanDistance = (xpos[0] - xpos[1])/idiff;
3843 // we have do not even have 2 layers which are OK? The we do not need to fit at all
3848 meanDistance /= nDistances;
3850 return tracklets[startIndex].GetX0() + (2.5 - startIndex) * meanDistance - 0.5 * (AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick());
3853 //_____________________________________________________________________________
3854 Double_t AliTRDtrackerV1::FitTiltedRiemanV1(AliTRDseedV1 *const tracklets){
3856 // Track Fitter Function using the new class implementation of
3859 AliTRDtrackFitterRieman fitter;
3860 fitter.SetRiemanFitter(GetTiltedRiemanFitter());
3862 for(Int_t il = 0; il < AliTRDgeometry::kNlayer; il++) fitter.SetTracklet(il, &tracklets[il]);
3863 Double_t chi2 = fitter.Eval();
3864 // Update the tracklets
3865 Double_t cov[15]; Double_t x0;
3866 memset(cov, 0, sizeof(Double_t) * 15);
3867 for(Int_t il = 0; il < AliTRDgeometry::kNlayer; il++){
3868 x0 = tracklets[il].GetX0();
3869 tracklets[il].SetYref(0, fitter.GetYat(x0));
3870 tracklets[il].SetZref(0, fitter.GetZat(x0));
3871 tracklets[il].SetYref(1, fitter.GetDyDxAt(x0));
3872 tracklets[il].SetZref(1, fitter.GetDzDx());
3873 tracklets[il].SetC(fitter.GetCurvature());
3874 fitter.GetCovAt(x0, cov);
3875 tracklets[il].SetCovRef(cov);
3876 tracklets[il].SetChi2(chi2);
3881 //____________________________________________________________________
3882 void AliTRDtrackerV1::UnsetTrackletsTrack(const AliTRDtrackV1 * const track)
3884 // Remove tracklets from tracker list attached to "track"
3886 for(Int_t il(0); il<kNPlanes; il++){
3887 if((idx = track->GetTrackletIndex(il)) < 0) continue;
3888 delete (fTracklets->RemoveAt(idx));
3893 ///////////////////////////////////////////////////////
3895 // Resources of class AliTRDLeastSquare //
3897 ///////////////////////////////////////////////////////
3899 //_____________________________________________________________________________
3900 AliTRDtrackerV1::AliTRDLeastSquare::AliTRDLeastSquare(){
3902 // Constructor of the nested class AliTRDtrackFitterLeastSquare
3904 // Fast solving linear regresion in 2D
3906 // The data members have the following meaning
3917 // fCovarianceMatrix[0] : s2a
3918 // fCovarianceMatrix[1] : s2b
3919 // fCovarianceMatrix[2] : cov(ab)
3921 memset(fParams, 0, sizeof(Double_t) * 2);
3922 memset(fSums, 0, sizeof(Double_t) * 6);
3923 memset(fCovarianceMatrix, 0, sizeof(Double_t) * 3);
3927 //_____________________________________________________________________________
3928 void AliTRDtrackerV1::AliTRDLeastSquare::AddPoint(const Double_t *const x, Double_t y, Double_t sigmaY){
3930 // Adding Point to the fitter
3933 Double_t weight = 1/(sigmaY > 1e-9 ? sigmaY : 1e-9);
3935 const Double_t &xpt = *x;
3936 // printf("Adding point x = %f, y = %f, sigma = %f\n", xpt, y, sigmaY);
3938 fSums[1] += weight * xpt;
3939 fSums[2] += weight * y;
3940 fSums[3] += weight * xpt * y;
3941 fSums[4] += weight * xpt * xpt;
3942 fSums[5] += weight * y * y;
3945 //_____________________________________________________________________________
3946 void AliTRDtrackerV1::AliTRDLeastSquare::RemovePoint(const Double_t *const x, Double_t y, Double_t sigmaY){
3948 // Remove Point from the sample
3951 Double_t weight = 1/(sigmaY > 1e-9 ? sigmaY : 1e-9);
3953 const Double_t &xpt = *x;
3955 fSums[1] -= weight * xpt;
3956 fSums[2] -= weight * y;
3957 fSums[3] -= weight * xpt * y;
3958 fSums[4] -= weight * xpt * xpt;
3959 fSums[5] -= weight * y * y;
3962 //_____________________________________________________________________________
3963 Bool_t AliTRDtrackerV1::AliTRDLeastSquare::Eval(){
3965 // Evaluation of the fit:
3966 // Calculation of the parameters
3967 // Calculation of the covariance matrix
3970 Double_t det = fSums[0] * fSums[4] - fSums[1] *fSums[1];
3971 if(TMath::Abs(det)<1.e-30) return kFALSE;
3973 // for(Int_t isum = 0; isum < 5; isum++)
3974 // printf("fSums[%d] = %f\n", isum, fSums[isum]);
3975 // printf("denominator = %f\n", denominator);
3976 fParams[0] = (fSums[2] * fSums[4] - fSums[1] * fSums[3])/det;
3977 fParams[1] = (fSums[0] * fSums[3] - fSums[1] * fSums[2])/det;
3978 // printf("fParams[0] = %f, fParams[1] = %f\n", fParams[0], fParams[1]);
3980 // Covariance matrix
3981 Double_t den = fSums[0]*fSums[4] - fSums[1]*fSums[1];
3982 fCovarianceMatrix[0] = fSums[4] / den;
3983 fCovarianceMatrix[1] = fSums[0] / den;
3984 fCovarianceMatrix[2] = -fSums[1] / den;
3985 /* fCovarianceMatrix[0] = fSums[4] / fSums[0] - fSums[1] * fSums[1] / (fSums[0] * fSums[0]);
3986 fCovarianceMatrix[1] = fSums[5] / fSums[0] - fSums[2] * fSums[2] / (fSums[0] * fSums[0]);
3987 fCovarianceMatrix[2] = fSums[3] / fSums[0] - fSums[1] * fSums[2] / (fSums[0] * fSums[0]);*/
3994 //_____________________________________________________________________________
3995 Double_t AliTRDtrackerV1::AliTRDLeastSquare::GetFunctionValue(const Double_t *const xpos) const {
3997 // Returns the Function value of the fitted function at a given x-position
3999 return fParams[0] + fParams[1] * (*xpos);
4002 //_____________________________________________________________________________
4003 void AliTRDtrackerV1::AliTRDLeastSquare::GetCovarianceMatrix(Double_t *storage) const {
4005 // Copies the values of the covariance matrix into the storage
4007 memcpy(storage, fCovarianceMatrix, sizeof(Double_t) * 3);
4010 //_____________________________________________________________________________
4011 void AliTRDtrackerV1::AliTRDLeastSquare::Reset(){
4015 memset(fParams, 0, sizeof(Double_t) * 2);
4016 memset(fCovarianceMatrix, 0, sizeof(Double_t) * 3);
4017 memset(fSums, 0, sizeof(Double_t) * 6);
4020 ///////////////////////////////////////////////////////
4022 // Resources of class AliTRDtrackFitterRieman //
4024 ///////////////////////////////////////////////////////
4026 //_____________________________________________________________________________
4027 AliTRDtrackerV1::AliTRDtrackFitterRieman::AliTRDtrackFitterRieman():
4033 fSysClusterError(0.)
4036 // Default constructor
4038 fZfitter = new AliTRDLeastSquare;
4039 fCovarPolY = new TMatrixD(3,3);
4040 fCovarPolZ = new TMatrixD(2,2);
4041 memset(fTracklets, 0, sizeof(AliTRDseedV1 *) * 6);
4042 memset(fParameters, 0, sizeof(Double_t) * 5);
4043 memset(fSumPolY, 0, sizeof(Double_t) * 5);
4044 memset(fSumPolZ, 0, sizeof(Double_t) * 2);
4047 //_____________________________________________________________________________
4048 AliTRDtrackerV1::AliTRDtrackFitterRieman::~AliTRDtrackFitterRieman(){
4052 if(fZfitter) delete fZfitter;
4053 if(fCovarPolY) delete fCovarPolY;
4054 if(fCovarPolZ) delete fCovarPolZ;
4057 //_____________________________________________________________________________
4058 void AliTRDtrackerV1::AliTRDtrackFitterRieman::Reset(){
4063 fTrackFitter->StoreData(kTRUE);
4064 fTrackFitter->ClearPoints();
4070 memset(fTracklets, 0, sizeof(AliTRDseedV1 *) * AliTRDgeometry::kNlayer);
4071 memset(fParameters, 0, sizeof(Double_t) * 5);
4072 memset(fSumPolY, 0, sizeof(Double_t) * 5);
4073 memset(fSumPolZ, 0, sizeof(Double_t) * 2);
4074 for(Int_t irow = 0; irow < fCovarPolY->GetNrows(); irow++)
4075 for(Int_t icol = 0; icol < fCovarPolY->GetNcols(); icol++){
4076 (*fCovarPolY)(irow, icol) = 0.;
4077 if(irow < 2 && icol < 2)
4078 (*fCovarPolZ)(irow, icol) = 0.;
4082 //_____________________________________________________________________________
4083 void AliTRDtrackerV1::AliTRDtrackFitterRieman::SetTracklet(Int_t itr, AliTRDseedV1 *tracklet){
4085 // Add tracklet into the fitter
4087 if(itr >= AliTRDgeometry::kNlayer) return;
4088 fTracklets[itr] = tracklet;
4091 //_____________________________________________________________________________
4092 Double_t AliTRDtrackerV1::AliTRDtrackFitterRieman::Eval(){
4095 // 1. Apply linear transformation and store points in the fitter
4096 // 2. Evaluate the fit
4097 // 3. Check if the result of the fit in z-direction is reasonable
4099 // 3a. Fix the parameters 3 and 4 with the results of a simple least
4101 // 3b. Redo the fit with the fixed parameters
4102 // 4. Store fit results (parameters and errors)
4107 fXref = CalculateReferenceX();
4108 for(Int_t il = 0; il < AliTRDgeometry::kNlayer; il++) UpdateFitters(fTracklets[il]);
4109 if(!fTrackFitter->GetNpoints()) return 1e10;
4111 fTrackFitter->Eval();
4113 fParameters[3] = fTrackFitter->GetParameter(3);
4114 fParameters[4] = fTrackFitter->GetParameter(4);
4115 if(!CheckAcceptable(fParameters[3], fParameters[4])) {
4116 fTrackFitter->FixParameter(3, fZfitter->GetFunctionValue(&fXref));
4117 fTrackFitter->FixParameter(4, fZfitter->GetFunctionParameter(1));
4118 fTrackFitter->Eval();
4119 fTrackFitter->ReleaseParameter(3);
4120 fTrackFitter->ReleaseParameter(4);
4121 fParameters[3] = fTrackFitter->GetParameter(3);
4122 fParameters[4] = fTrackFitter->GetParameter(4);
4124 // Update the Fit Parameters and the errors
4125 fParameters[0] = fTrackFitter->GetParameter(0);
4126 fParameters[1] = fTrackFitter->GetParameter(1);
4127 fParameters[2] = fTrackFitter->GetParameter(2);
4129 // Prepare Covariance estimation
4130 (*fCovarPolY)(0,0) = fSumPolY[0]; (*fCovarPolY)(1,1) = fSumPolY[2]; (*fCovarPolY)(2,2) = fSumPolY[4];
4131 (*fCovarPolY)(1,0) = (*fCovarPolY)(0,1) = fSumPolY[1];
4132 (*fCovarPolY)(2,0) = (*fCovarPolY)(0,2) = fSumPolY[2];
4133 (*fCovarPolY)(2,1) = (*fCovarPolY)(1,2) = fSumPolY[3];
4134 fCovarPolY->Invert();
4135 (*fCovarPolZ)(0,0) = fSumPolZ[0]; (*fCovarPolZ)(1,1) = fSumPolZ[2];
4136 (*fCovarPolZ)(1,0) = (*fCovarPolZ)(0,1) = fSumPolZ[1];
4137 fCovarPolZ->Invert();
4138 return fTrackFitter->GetChisquare() / fTrackFitter->GetNpoints();
4141 //_____________________________________________________________________________
4142 void AliTRDtrackerV1::AliTRDtrackFitterRieman::UpdateFitters(const AliTRDseedV1 * const tracklet){
4144 // Does the transformations and updates the fitters
4145 // The following transformation is applied
4147 AliTRDcluster *cl = NULL;
4148 Double_t x, y, z, dx, t, w, we, yerr, zerr;
4150 if(!tracklet || !tracklet->IsOK()) return;
4151 Double_t tilt = tracklet->GetTilt();
4152 for(Int_t itb = 0; itb < AliTRDseedV1::kNclusters; itb++){
4153 if(!(cl = tracklet->GetClusters(itb))) continue;
4154 if(!cl->IsInChamber()) continue;
4155 if (!tracklet->IsUsable(itb)) continue;
4162 uvt[0] = 2. * x * t;
4164 uvt[2] = 2. * tilt * t;
4165 uvt[3] = 2. * tilt * dx * t;
4166 w = 2. * (y + tilt*z) * t;
4167 // error definition changes for the different calls
4169 we *= TMath::Sqrt(cl->GetSigmaY2()+tilt*tilt*cl->GetSigmaZ2());
4170 // Update sums for error calculation
4171 yerr = 1./(TMath::Sqrt(cl->GetSigmaY2()) + fSysClusterError);
4173 zerr = 1./cl->GetSigmaZ2();
4174 for(Int_t ipol = 0; ipol < 5; ipol++){
4175 fSumPolY[ipol] += yerr;
4178 fSumPolZ[ipol] += zerr;
4182 fTrackFitter->AddPoint(uvt, w, we);
4183 fZfitter->AddPoint(&x, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
4187 //_____________________________________________________________________________
4188 Bool_t AliTRDtrackerV1::AliTRDtrackFitterRieman::CheckAcceptable(Double_t offset, Double_t slope){
4190 // Check whether z-results are acceptable
4191 // Definition: Distance between tracklet fit and track fit has to be
4192 // less then half a padlength
4193 // Point of comparision is at the anode wire
4195 Bool_t acceptablez = kTRUE;
4196 Double_t zref = 0.0;
4197 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
4198 if(!fTracklets[iLayer]->IsOK()) continue;
4199 zref = offset + slope * (fTracklets[iLayer]->GetX0() - fXref);
4200 if (TMath::Abs(fTracklets[iLayer]->GetZfit(0) - zref) > fTracklets[iLayer]->GetPadLength() * 0.5 + 1.0)
4201 acceptablez = kFALSE;
4206 //_____________________________________________________________________________
4207 Double_t AliTRDtrackerV1::AliTRDtrackFitterRieman::GetYat(Double_t x) const {
4209 // Calculate y position out of the track parameters
4210 // y: R^2 = (x - x0)^2 + (y - y0)^2
4211 // => y = y0 +/- Sqrt(R^2 - (x - x0)^2)
4212 // R = Sqrt() = 1/Curvature
4213 // => y = y0 +/- Sqrt(1/Curvature^2 - (x - x0)^2)
4216 Double_t disc = (x * fParameters[0] + fParameters[1]);
4217 disc = 1 - fParameters[0]*fParameters[2] + fParameters[1]*fParameters[1] - disc*disc;
4219 disc = TMath::Sqrt(disc);
4220 y = (1.0 - disc) / fParameters[0];
4225 //_____________________________________________________________________________
4226 Double_t AliTRDtrackerV1::AliTRDtrackFitterRieman::GetZat(Double_t x) const {
4228 // Return z position for a given x position
4229 // Simple linear function
4231 return fParameters[3] + fParameters[4] * (x - fXref);
4234 //_____________________________________________________________________________
4235 Double_t AliTRDtrackerV1::AliTRDtrackFitterRieman::GetDyDxAt(Double_t x) const {
4237 // Calculate dydx at a given radial position out of the track parameters
4238 // dy: R^2 = (x - x0)^2 + (y - y0)^2
4239 // => y = +/- Sqrt(R^2 - (x - x0)^2) + y0
4240 // => dy/dx = (x - x0)/Sqrt(R^2 - (x - x0)^2)
4241 // Curvature: cr = 1/R = a/Sqrt(1 + b^2 - c*a)
4242 // => dy/dx = (x - x0)/(1/(cr^2) - (x - x0)^2)
4244 Double_t x0 = -fParameters[1] / fParameters[0];
4245 Double_t curvature = GetCurvature();
4247 if (-fParameters[2] * fParameters[0] + fParameters[1] * fParameters[1] + 1 > 0) {
4248 if (1.0/(curvature * curvature) - (x - x0) * (x - x0) > 0.0) {
4249 Double_t yderiv = (x - x0) / TMath::Sqrt(1.0/(curvature * curvature) - (x - x0) * (x - x0));
4250 if (fParameters[0] < 0) yderiv *= -1.0;
4257 //_____________________________________________________________________________
4258 Double_t AliTRDtrackerV1::AliTRDtrackFitterRieman::GetCurvature() const {
4260 // Calculate track curvature
4263 Double_t curvature = 1.0 + fParameters[1]*fParameters[1] - fParameters[2]*fParameters[0];
4264 if (curvature > 0.0)
4265 curvature = fParameters[0] / TMath::Sqrt(curvature);
4269 //_____________________________________________________________________________
4270 void AliTRDtrackerV1::AliTRDtrackFitterRieman::GetCovAt(Double_t x, Double_t *cov) const {
4272 // Error Definition according to gauss error propagation
4274 TMatrixD transform(3,3);
4275 transform(0,0) = transform(1,1) = transform(2,2) = 1;
4276 transform(0,1) = transform(1,2) = x;
4277 transform(0,2) = x*x;
4278 TMatrixD covariance(transform, TMatrixD::kMult, *fCovarPolY);
4279 covariance *= transform.T();
4280 cov[0] = covariance(0,0);
4281 TMatrixD transformZ(2,2);
4282 transformZ(0,0) = transformZ(1,1) = 1;
4283 transformZ(0,1) = x;
4284 TMatrixD covarZ(transformZ, TMatrixD::kMult, *fCovarPolZ);
4285 covarZ *= transformZ.T();
4286 cov[1] = covarZ(0,0);
4290 //____________________________________________________________________
4291 Double_t AliTRDtrackerV1::AliTRDtrackFitterRieman::CalculateReferenceX(){
4293 // Calculates the reference x-position for the tilted Rieman fit defined as middle
4294 // of the stack (middle between layers 2 and 3). For the calculation all the tracklets
4295 // are taken into account
4297 // Parameters: - Array of tracklets(AliTRDseedV1)
4299 // Output: - The reference x-position(Float_t)
4301 Int_t nDistances = 0;
4302 Float_t meanDistance = 0.;
4303 Int_t startIndex = 5;
4304 for(Int_t il =5; il > 0; il--){
4305 if(fTracklets[il]->IsOK() && fTracklets[il -1]->IsOK()){
4306 Float_t xdiff = fTracklets[il]->GetX0() - fTracklets[il -1]->GetX0();
4307 meanDistance += xdiff;
4310 if(fTracklets[il]->IsOK()) startIndex = il;
4312 if(fTracklets[0]->IsOK()) startIndex = 0;
4314 // We should normally never get here
4315 Float_t xpos[2]; memset(xpos, 0, sizeof(Float_t) * 2);
4316 Int_t iok = 0, idiff = 0;
4317 // This attempt is worse and should be avoided:
4318 // check for two chambers which are OK and repeat this without taking the mean value
4319 // Strategy avoids a division by 0;
4320 for(Int_t il = 5; il >= 0; il--){
4321 if(fTracklets[il]->IsOK()){
4322 xpos[iok] = fTracklets[il]->GetX0();
4326 if(iok) idiff++; // to get the right difference;
4330 meanDistance = (xpos[0] - xpos[1])/idiff;
4333 // we have do not even have 2 layers which are OK? The we do not need to fit at all
4338 meanDistance /= nDistances;
4340 return fTracklets[startIndex]->GetX0() + (2.5 - startIndex) * meanDistance - 0.5 * (AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick());