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 AliInfo(Form("Pl:%d X:%+e : %+e P: %+e %+e Cov:%+e %+e %+e -> dXY: %+e %+e | chi2:%.2f pT:%.2f alp:%.3f",
628 iplane,x,t.GetX(),p[0],p[1],cov[0],cov[1],cov[2],
629 p[0]-t.GetY(),p[1]-t.GetZ(),
630 chi2,t.Pt()*t.Charge(),t.GetAlpha()));
631 if (chi2 < 1e+10 && ((AliExternalTrackParam&)t).Update(p, cov)){
632 // Register info to track
633 t.SetNumberOfClusters();
635 nClustersExpected += tracklet->GetN();
639 if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 1){
641 for(int iplane=0; iplane<AliTRDgeometry::kNlayer; iplane++){
642 AliTRDseedV1 *tracklet = GetTracklet(&t, iplane, index);
643 if(!tracklet) continue;
644 t.SetTracklet(tracklet, index);
647 if(fkReconstructor->IsDebugStreaming()){
648 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
649 TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
650 AliTRDtrackV1 track(t);
652 cstreamer << "FollowProlongation"
653 << "EventNumber=" << eventNumber
654 << "ncl=" << nClustersExpected
655 << "track.=" << &track
659 return nClustersExpected;
663 //_____________________________________________________________________________
664 Int_t AliTRDtrackerV1::FollowBackProlongation(AliTRDtrackV1 &t)
666 // Extrapolates/Build the TRD track in the TOF direction.
669 // t : the TRD track which has to be extrapolated
672 // number of clusters attached to the track
674 // Starting from current radial position of track <t> this function
675 // extrapolates the track through the 6 TRD layers. The following steps
676 // are being performed for each plane:
677 // 1. Propagate track to the entrance of the next chamber:
678 // - get chamber limits in the radial direction
679 // - check crossing sectors
680 // - check track inclination
681 // - check track prolongation against boundary conditions (see exclusion boundaries on AliTRDgeometry::IsOnBoundary())
682 // 2. Build tracklet (see AliTRDseed::AttachClusters() for details) for this layer if needed. If only
683 // Kalman filter is needed and tracklets are already linked to the track this step is skipped.
684 // 3. Fit tracklet using the information from the Kalman filter.
685 // 4. Propagate and update track at reference radial position of the tracklet.
686 // 5. Register tracklet with the tracker and track; update pulls monitoring.
689 // 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:
690 // - AliTRDtrackV1::kProlongation : track prolongation failed
691 // - AliTRDtrackV1::kPropagation : track prolongation failed
692 // - AliTRDtrackV1::kAdjustSector : failed during sector crossing
693 // - AliTRDtrackV1::kSnp : too large bending
694 // - AliTRDtrackV1::kTrackletInit : fail to initialize tracklet
695 // - AliTRDtrackV1::kUpdate : fail to attach clusters or fit the tracklet
696 // - AliTRDtrackV1::kUnknown : anything which is not covered before
697 // 2. By default the status of the track before first TRD update is saved.
702 // Alexandru Bercuci <A.Bercuci@gsi.de>
706 Double_t driftLength = .5*AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick();
707 AliTRDtrackingChamber *chamber = NULL;
709 Int_t debugLevel = fkReconstructor->IsDebugStreaming() ? fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) : 0;
710 TTreeSRedirector *cstreamer = fkReconstructor->IsDebugStreaming() ? fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker) : 0x0;
712 Bool_t kStoreIn(kTRUE), // toggel store track params. at TRD entry
713 kStandAlone(kFALSE), // toggle tracker awarness of stand alone seeding
714 kUseTRD(fkRecoParam->IsOverPtThreshold(t.Pt()));// use TRD measurment to update Kalman
717 AliTRDseedV1 tracklet, *ptrTracklet = NULL;
718 // Special case for stand alone tracking
719 // - store all tracklets found by seeding
720 // - start propagation from first tracklet found
721 AliTRDseedV1 *tracklets[kNPlanes];
722 memset(tracklets, 0, sizeof(AliTRDseedV1 *) * kNPlanes);
723 for(Int_t ip(kNPlanes); ip--;){
724 if(!(tracklets[ip] = t.GetTracklet(ip))) continue;
726 if(tracklets[ip]->IsOK()) startLayer=ip;
730 AliDebug(4, Form("SA[%c] Start[%d]\n"
731 " [0]idx[%d] traklet[%p]\n"
732 " [1]idx[%d] traklet[%p]\n"
733 " [2]idx[%d] traklet[%p]\n"
734 " [3]idx[%d] traklet[%p]\n"
735 " [4]idx[%d] traklet[%p]\n"
736 " [5]idx[%d] traklet[%p]"
737 , kStandAlone?'y':'n', startLayer
738 , t.GetTrackletIndex(0), (void*)tracklets[0]
739 , t.GetTrackletIndex(1), (void*)tracklets[1]
740 , t.GetTrackletIndex(2), (void*)tracklets[2]
741 , t.GetTrackletIndex(3), (void*)tracklets[3]
742 , t.GetTrackletIndex(4), (void*)tracklets[4]
743 , t.GetTrackletIndex(5), (void*)tracklets[5]));
745 // Loop through the TRD layers
746 TGeoHMatrix *matrix = NULL;
747 Double_t x(0.), y(0.), z(0.);
748 for (Int_t ily=startLayer, sm=-1, stk=-1, det=-1; ily < AliTRDgeometry::kNlayer; ily++) {
749 AliDebug(2, Form("Propagate to x[%d] = %7.2f", ily, fR[ily]));
751 // rough estimate of the entry point
752 if (!t.GetProlongation(fR[ily], y, z)){
754 t.SetErrStat(AliTRDtrackV1::kProlongation);
755 AliDebug(4, Form("Failed Rough Prolongation to ly[%d] x[%7.2f] y[%7.2f] z[%7.2f]", ily, fR[ily], y, z));
759 // find sector / stack / detector
761 // TODO cross check with y value !
762 stk = fGeom->GetStack(z, ily);
763 det = stk>=0 ? AliTRDgeometry::GetDetector(ily, stk, sm) : -1;
764 matrix = det>=0 ? fGeom->GetClusterMatrix(det) : NULL;
766 // check if supermodule/chamber is installed
767 if( !fGeom->GetSMstatus(sm) ||
769 fGeom->IsHole(ily, stk, sm) ||
771 AliDebug(4, Form("Missing Geometry ly[%d]. Guess radial position", ily));
772 // propagate to the default radial position
773 if(fR[ily] > (AliTRDReconstructor::GetMaxStep() + t.GetX()) && !PropagateToX(t, fR[ily], AliTRDReconstructor::GetMaxStep())){
775 t.SetErrStat(AliTRDtrackV1::kPropagation);
776 AliDebug(4, "Failed Propagation [Missing Geometry]");
779 if(!AdjustSector(&t)){
781 t.SetErrStat(AliTRDtrackV1::kAdjustSector);
782 AliDebug(4, "Failed Adjust Sector [Missing Geometry]");
785 if(TMath::Abs(t.GetSnp()) > AliTRDReconstructor::GetMaxSnp()){
787 t.SetErrStat(AliTRDtrackV1::kSnp);
788 AliDebug(4, "Failed Max Snp [Missing Geometry]");
791 t.SetErrStat(AliTRDtrackV1::kGeometry, ily);
795 // retrieve rotation matrix for the current chamber
796 Double_t loc[] = {AliTRDgeometry::AnodePos()- driftLength, 0., 0.};
797 Double_t glb[] = {0., 0., 0.};
798 matrix->LocalToMaster(loc, glb);
799 AliDebug(3, Form("Propagate to det[%3d] x_anode[%7.2f] (%f %f)", det, glb[0]+driftLength, glb[1], glb[2]));
801 // Propagate to the radial distance of the current layer
802 x = glb[0] - AliTRDReconstructor::GetMaxStep();
803 if(x > (AliTRDReconstructor::GetMaxStep() + t.GetX()) && !PropagateToX(t, x, AliTRDReconstructor::GetMaxStep())){
805 t.SetErrStat(AliTRDtrackV1::kPropagation);
806 AliDebug(4, Form("Failed Initial Propagation to x[%7.2f]", x));
809 if(!AdjustSector(&t)){
811 t.SetErrStat(AliTRDtrackV1::kAdjustSector);
812 AliDebug(4, "Failed Adjust Sector Start");
815 if(TMath::Abs(t.GetSnp()) > AliTRDReconstructor::GetMaxSnp()) {
817 t.SetErrStat(AliTRDtrackV1::kSnp);
818 AliDebug(4, Form("Failed Max Snp[%f] MaxSnp[%f]", t.GetSnp(), AliTRDReconstructor::GetMaxSnp()));
821 Bool_t doRecalculate = kFALSE;
822 if(sm != t.GetSector()){
824 doRecalculate = kTRUE;
826 if(stk != fGeom->GetStack(z, ily)){
827 stk = fGeom->GetStack(z, ily);
828 doRecalculate = kTRUE;
831 det = AliTRDgeometry::GetDetector(ily, stk, sm);
832 if(!(matrix = fGeom->GetClusterMatrix(det))){
833 t.SetErrStat(AliTRDtrackV1::kGeometry, ily);
834 AliDebug(4, Form("Failed Geometry Matrix ly[%d]", ily));
837 matrix->LocalToMaster(loc, glb);
838 x = glb[0] - AliTRDReconstructor::GetMaxStep();
841 // check if track is well inside fiducial volume
842 if (!t.GetProlongation(x+AliTRDReconstructor::GetMaxStep(), y, z)) {
844 t.SetErrStat(AliTRDtrackV1::kProlongation);
845 AliDebug(4, Form("Failed Prolongation to x[%7.2f] y[%7.2f] z[%7.2f]", x+AliTRDReconstructor::GetMaxStep(), y, z));
848 if(fGeom->IsOnBoundary(det, y, z, .5)){
849 t.SetErrStat(AliTRDtrackV1::kBoundary, ily);
850 AliDebug(4, "Failed Track on Boundary");
854 ptrTracklet = tracklets[ily];
855 if(!ptrTracklet){ // BUILD TRACKLET
856 AliDebug(3, Form("Building tracklet det[%d]", det));
857 // check data in supermodule
858 if(!fTrSec[sm].GetNChambers()){
859 t.SetErrStat(AliTRDtrackV1::kNoClusters, ily);
860 AliDebug(4, "Failed NoClusters");
863 if(fTrSec[sm].GetX(ily) < 1.){
864 t.SetErrStat(AliTRDtrackV1::kNoClusters, ily);
865 AliDebug(4, "Failed NoX");
869 // check data in chamber
870 if(!(chamber = fTrSec[sm].GetChamber(stk, ily))){
871 t.SetErrStat(AliTRDtrackV1::kNoClusters, ily);
872 AliDebug(4, "Failed No Detector");
875 if(chamber->GetNClusters() < fgNTimeBins*fkRecoParam ->GetFindableClusters()){
876 t.SetErrStat(AliTRDtrackV1::kNoClusters, ily);
877 AliDebug(4, "Failed Not Enough Clusters in Detector");
881 tracklet.~AliTRDseedV1();
882 ptrTracklet = new(&tracklet) AliTRDseedV1(det);
883 ptrTracklet->SetReconstructor(fkReconstructor);
884 ptrTracklet->SetKink(t.IsKink());
885 ptrTracklet->SetPrimary(t.IsPrimary());
886 ptrTracklet->SetPadPlane(fGeom->GetPadPlane(ily, stk));
887 //set first approximation of radial position of anode wire corresponding to middle chamber y=0, z=0
888 // the uncertainty is given by the actual position of the tracklet (y,z) and chamber inclination
889 ptrTracklet->SetX0(glb[0]+driftLength);
890 if(!ptrTracklet->Init(&t)){
892 t.SetErrStat(AliTRDtrackV1::kTrackletInit);
893 AliDebug(4, "Failed Tracklet Init");
896 // Select attachment base on track to B field sign not only track charge which is buggy
897 // mark kFALSE same sign tracks and kTRUE opposite sign tracks
898 // A.Bercuci 3.11.2011
899 Float_t prod(t.GetBz()*t.Charge());
900 if(!ptrTracklet->AttachClusters(chamber, kTRUE, prod<0.?kTRUE:kFALSE, fEventInFile)){
901 t.SetErrStat(AliTRDtrackV1::kNoAttach, ily);
903 AliTRDseedV1 trackletCp(*ptrTracklet);
904 UChar_t status(t.GetStatusTRD(ily));
905 (*cstreamer) << "FollowBackProlongation4"
906 <<"status=" << status
907 <<"tracklet.=" << &trackletCp
910 AliDebug(4, "Failed Attach Clusters");
913 AliDebug(3, Form("Number of Clusters in Tracklet: %d", ptrTracklet->GetN()));
914 if(ptrTracklet->GetN() < fgNTimeBins*fkRecoParam->GetFindableClusters()){
915 t.SetErrStat(AliTRDtrackV1::kNoClustersTracklet, ily);
917 AliTRDseedV1 trackletCp(*ptrTracklet);
918 UChar_t status(t.GetStatusTRD(ily));
919 (*cstreamer) << "FollowBackProlongation4"
920 <<"status=" << status
921 <<"tracklet.=" << &trackletCp
924 AliDebug(4, "Failed N Clusters Attached");
927 ptrTracklet->UpdateUsed();
928 } else AliDebug(2, Form("Use external tracklet ly[%d]", ily));
929 // propagate track to the radial position of the tracklet
931 // fit tracklet in the local chamber coordinate system
932 // tilt correction options
934 // 2 : pseudo tilt correction
935 if(!ptrTracklet->FitRobust(fGeom->GetPadPlane(ily, stk))){
936 t.SetErrStat(AliTRDtrackV1::kNoFit, ily);
937 AliDebug(4, "Failed Tracklet Fit");
940 // Calculate tracklet position in tracking coordinates
941 // A.Bercuci 27.11.2013
942 ptrTracklet->SetXYZ(matrix);
944 x = ptrTracklet->GetX(); //GetX0();
945 if(x > (AliTRDReconstructor::GetMaxStep() + t.GetX()) && !PropagateToX(t, x, AliTRDReconstructor::GetMaxStep())) {
947 t.SetErrStat(AliTRDtrackV1::kPropagation);
948 AliDebug(4, Form("Failed Propagation to Tracklet x[%7.2f]", x));
951 if(!AdjustSector(&t)) {
953 t.SetErrStat(AliTRDtrackV1::kAdjustSector);
954 AliDebug(4, "Failed Adjust Sector");
957 if(TMath::Abs(t.GetSnp()) > AliTRDReconstructor::GetMaxSnp()) {
959 t.SetErrStat(AliTRDtrackV1::kSnp);
960 AliDebug(4, Form("Failed Max Snp[%f] MaxSnp[%f]", t.GetSnp(), AliTRDReconstructor::GetMaxSnp()));
963 Double_t cov[3]; ptrTracklet->GetCovAt(x, cov);
964 Double_t p[2] = { ptrTracklet->GetY(), ptrTracklet->GetZ()};
965 Double_t chi2 = ((AliExternalTrackParam)t).GetPredictedChi2(p, cov);
967 AliInfo(Form("Pl:%d X:%+e : %+e P: %+e %+e Cov:%+e %+e %+e -> dXY: %+e %+e | chi2:%.2f pT:%.2f alp:%.3f",
968 ily,x,t.GetX(),p[0],p[1],cov[0],cov[1],cov[2],
969 p[0]-t.GetY(),p[1]-t.GetZ(),
970 chi2,t.Pt()*t.Charge(),t.GetAlpha()));
972 // update Kalman with the TRD measurement
974 // if(chi2>1e+10){ // TODO
975 t.SetErrStat(AliTRDtrackV1::kChi2, ily);
977 UChar_t status(t.GetStatusTRD());
978 AliTRDseedV1 trackletCp(*ptrTracklet);
979 AliTRDtrackV1 trackCp(t);
981 (*cstreamer) << "FollowBackProlongation3"
982 << "status=" << status
983 << "tracklet.=" << &trackletCp
984 << "track.=" << &trackCp
987 AliDebug(4, Form("Failed Chi2[%f]", chi2));
990 // mark track as entering the FIDUCIAL volume of TRD
996 if(!((AliExternalTrackParam&)t).Update(p, cov)) {
998 t.SetErrStat(AliTRDtrackV1::kUpdate);
1000 UChar_t status(t.GetStatusTRD());
1001 AliTRDseedV1 trackletCp(*ptrTracklet);
1002 AliTRDtrackV1 trackCp(t);
1004 (*cstreamer) << "FollowBackProlongation3"
1005 << "status=" << status
1006 << "tracklet.=" << &trackletCp
1007 << "track.=" << &trackCp
1010 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]));
1014 if(!kStandAlone) ptrTracklet->UseClusters();
1015 // fill residuals ?!
1016 AliTracker::FillResiduals(&t, p, cov, ptrTracklet->GetVolumeId());
1019 // register tracklet with the tracker and track
1020 // Save inside the tracklet the track parameters BEFORE track update.
1021 // Commented out their overwriting AFTER track update
1022 // A.Bercuci 3.11.2011
1023 //ptrTracklet->Update(&t);
1024 ptrTracklet = SetTracklet(ptrTracklet);
1025 Int_t index(fTracklets->GetEntriesFast()-1);
1026 t.SetTracklet(ptrTracklet, index);
1027 // Register info to track
1028 t.SetNumberOfClusters();
1031 n += ptrTracklet->GetN();
1032 AliDebug(2, Form("Setting Tracklet[%d] @ Idx[%d]", ily, index));
1034 // Reset material budget if 2 consecutive gold
1035 // if(ilayer>0 && t.GetTracklet(ilayer-1) && ptrTracklet->GetN() + t.GetTracklet(ilayer-1)->GetN() > 20) t.SetBudget(2, 0.);
1037 // Make backup of the track until is gold
1039 if(!kStandAlone && (failed = t.MakeBackupTrack())) AliDebug(2, Form("Failed backup on cut[%d]", failed));
1041 } // end layers loop
1042 //printf("clusters[%d] chi2[%f] x[%f] status[%d ", n, t.GetChi2(), t.GetX(), t.GetStatusTRD());
1043 //for(int i=0; i<6; i++) printf("%d ", t.GetStatusTRD(i)); printf("]\n");
1045 if(n && debugLevel > 1){
1046 //Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
1047 AliTRDtrackV1 track(t);
1049 (*cstreamer) << "FollowBackProlongation2"
1050 << "EventNumber=" << fEventInFile
1051 << "track.=" << &track
1058 //_________________________________________________________________________
1059 Float_t AliTRDtrackerV1::FitRieman(AliTRDseedV1 *tracklets, Double_t *chi2, Int_t *const planes){
1061 // Fits a Riemann-circle to the given points without tilting pad correction.
1062 // The fit is performed using an instance of the class AliRieman (equations
1063 // and transformations see documentation of this class)
1064 // Afterwards all the tracklets are Updated
1066 // Parameters: - Array of tracklets (AliTRDseedV1)
1067 // - Storage for the chi2 values (beginning with direction z)
1068 // - Seeding configuration
1069 // Output: - The curvature
1071 AliRieman *fitter = AliTRDtrackerV1::GetRiemanFitter();
1073 Int_t allplanes[] = {0, 1, 2, 3, 4, 5};
1074 Int_t *ppl = &allplanes[0];
1075 Int_t maxLayers = 6;
1080 for(Int_t il = 0; il < maxLayers; il++){
1081 if(!tracklets[ppl[il]].IsOK()) continue;
1082 fitter->AddPoint(tracklets[ppl[il]].GetX0(), tracklets[ppl[il]].GetYfit(0), tracklets[ppl[il]].GetZfit(0),1,10);
1085 // Set the reference position of the fit and calculate the chi2 values
1086 memset(chi2, 0, sizeof(Double_t) * 2);
1087 for(Int_t il = 0; il < maxLayers; il++){
1088 // Reference positions
1089 tracklets[ppl[il]].Init(fitter);
1092 if((!tracklets[ppl[il]].IsOK()) && (!planes)) continue;
1093 chi2[0] += tracklets[ppl[il]].GetChi2Y();
1094 chi2[1] += tracklets[ppl[il]].GetChi2Z();
1096 return fitter->GetC();
1099 //_________________________________________________________________________
1100 void AliTRDtrackerV1::FitRieman(AliTRDcluster **seedcl, Double_t chi2[2])
1103 // Performs a Riemann helix fit using the seedclusters as spacepoints
1104 // Afterwards the chi2 values are calculated and the seeds are updated
1106 // Parameters: - The four seedclusters
1107 // - The tracklet array (AliTRDseedV1)
1108 // - The seeding configuration
1113 AliRieman *fitter = AliTRDtrackerV1::GetRiemanFitter();
1115 for(Int_t i = 0; i < 4; i++){
1116 fitter->AddPoint(seedcl[i]->GetX(), seedcl[i]->GetY(), seedcl[i]->GetZ(), 1., 10.);
1121 // Update the seed and calculated the chi2 value
1122 chi2[0] = 0; chi2[1] = 0;
1123 for(Int_t ipl = 0; ipl < kNSeedPlanes; ipl++){
1125 chi2[0] += (seedcl[ipl]->GetZ() - fitter->GetZat(seedcl[ipl]->GetX())) * (seedcl[ipl]->GetZ() - fitter->GetZat(seedcl[ipl]->GetX()));
1126 chi2[1] += (seedcl[ipl]->GetY() - fitter->GetYat(seedcl[ipl]->GetX())) * (seedcl[ipl]->GetY() - fitter->GetYat(seedcl[ipl]->GetX()));
1131 //_________________________________________________________________________
1132 Float_t AliTRDtrackerV1::FitTiltedRiemanConstraint(AliTRDseedV1 *tracklets, Double_t zVertex)
1135 // Fits a helix to the clusters. Pad tilting is considered. As constraint it is
1136 // assumed that the vertex position is set to 0.
1137 // This method is very usefull for high-pt particles
1138 // Basis for the fit: (x - x0)^2 + (y - y0)^2 - R^2 = 0
1139 // x0, y0: Center of the circle
1140 // Measured y-position: ymeas = y - tan(phiT)(zc - zt)
1141 // zc: center of the pad row
1142 // Equation which has to be fitted (after transformation):
1143 // a + b * u + e * v + 2*(ymeas + tan(phiT)(z - zVertex))*t = 0
1145 // t = 1/(x^2 + y^2)
1147 // v = 2 * x * tan(phiT) * t
1148 // Parameters in the equation:
1149 // a = -1/y0, b = x0/y0, e = dz/dx
1151 // The Curvature is calculated by the following equation:
1152 // - curv = a/Sqrt(b^2 + 1) = 1/R
1153 // Parameters: - the 6 tracklets
1154 // - the Vertex constraint
1155 // Output: - the Chi2 value of the track
1160 TLinearFitter *fitter = GetTiltedRiemanFitterConstraint();
1161 fitter->StoreData(kTRUE);
1162 fitter->ClearPoints();
1163 AliTRDcluster *cl = NULL;
1165 Float_t x, y, z, w, t, error, tilt;
1168 for(Int_t ilr = 0; ilr < AliTRDgeometry::kNlayer; ilr++){
1169 if(!tracklets[ilr].IsOK()) continue;
1170 for(Int_t itb = 0; itb < AliTRDseedV1::kNclusters; itb++){
1171 if(!tracklets[ilr].IsUsable(itb)) continue;
1172 if(!(cl = tracklets[ilr].GetClusters(itb))) continue;
1173 if(!cl->IsInChamber()) continue;
1177 tilt = tracklets[ilr].GetTilt();
1179 t = 1./(x * x + y * y);
1180 uvt[0] = 2. * x * t;
1181 uvt[1] = 2. * x * t * tilt ;
1182 w = 2. * (y + tilt * (z - zVertex)) * t;
1183 error = 2. * TMath::Sqrt(cl->GetSigmaY2()+tilt*tilt*cl->GetSigmaZ2()) * t;
1184 fitter->AddPoint(uvt, w, error);
1190 // Calculate curvature
1191 Double_t a = fitter->GetParameter(0);
1192 Double_t b = fitter->GetParameter(1);
1193 Double_t curvature = a/TMath::Sqrt(b*b + 1);
1195 Float_t chi2track = 0.0;
1197 chi2track = fitter->GetChisquare()/Double_t(nPoints);
1199 for(Int_t ip = 0; ip < AliTRDtrackerV1::kNPlanes; ip++)
1200 tracklets[ip].SetC(curvature, 1);
1202 if(AliLog::GetDebugLevel("TRD", "AliTRDtrackerV1")>3) printf("D-AliTRDtrackerV1::FitTiltedRiemanConstraint: Chi2[%f] C[%5.2e] pt[%8.3f]\n", chi2track, curvature, GetBz()*kB2C/curvature);
1204 /* if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker()) >= 5){
1205 //Linear Model on z-direction
1206 Double_t xref = CalculateReferenceX(tracklets); // Relative to the middle of the stack
1207 Double_t slope = fitter->GetParameter(2);
1208 Double_t zref = slope * xref;
1209 Float_t chi2Z = CalculateChi2Z(tracklets, zref, slope, xref);
1210 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
1211 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
1212 TTreeSRedirector &treeStreamer = *fkReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
1213 treeStreamer << "FitTiltedRiemanConstraint"
1214 << "EventNumber=" << eventNumber
1215 << "CandidateNumber=" << candidateNumber
1216 << "Curvature=" << curvature
1217 << "Chi2Track=" << chi2track
1218 << "Chi2Z=" << chi2Z
1225 //_________________________________________________________________________
1226 Float_t AliTRDtrackerV1::FitTiltedRieman(AliTRDseedV1 *tracklets, Bool_t sigError)
1229 // Performs a Riemann fit taking tilting pad correction into account
1230 // The equation of a Riemann circle, where the y position is substituted by the
1231 // measured y-position taking pad tilting into account, has to be transformed
1232 // into a 4-dimensional hyperplane equation
1233 // Riemann circle: (x-x0)^2 + (y-y0)^2 -R^2 = 0
1234 // Measured y-Position: ymeas = y - tan(phiT)(zc - zt)
1235 // zc: center of the pad row
1236 // zt: z-position of the track
1237 // The z-position of the track is assumed to be linear dependent on the x-position
1238 // Transformed equation: a + b * u + c * t + d * v + e * w - 2 * (ymeas + tan(phiT) * zc) * t = 0
1239 // Transformation: u = 2 * x * t
1240 // v = 2 * tan(phiT) * t
1241 // w = 2 * tan(phiT) * (x - xref) * t
1242 // t = 1 / (x^2 + ymeas^2)
1243 // Parameters: a = -1/y0
1245 // c = (R^2 -x0^2 - y0^2)/y0
1248 // If the offset respectively the slope in z-position is impossible, the parameters are fixed using
1249 // results from the simple riemann fit. Afterwards the fit is redone.
1250 // The curvature is calculated according to the formula:
1251 // curv = a/(1 + b^2 + c*a) = 1/R
1253 // Paramters: - Array of tracklets (connected to the track candidate)
1254 // - Flag selecting the error definition
1255 // Output: - Chi2 values of the track (in Parameter list)
1257 TLinearFitter *fitter = GetTiltedRiemanFitter();
1258 fitter->StoreData(kTRUE);
1259 fitter->ClearPoints();
1260 AliTRDLeastSquare zfitter;
1261 AliTRDcluster *cl = NULL;
1263 Double_t xref = CalculateReferenceX(tracklets);
1264 Double_t x, y, z, t, tilt, dx, w, we, erry, errz;
1265 Double_t uvt[4], sumPolY[5], sumPolZ[3];
1266 memset(sumPolY, 0, sizeof(Double_t) * 5);
1267 memset(sumPolZ, 0, sizeof(Double_t) * 3);
1269 // Containers for Least-square fitter
1270 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1271 if(!tracklets[ipl].IsOK()) continue;
1272 tilt = tracklets[ipl].GetTilt();
1273 for(Int_t itb = 0; itb < AliTRDseedV1::kNclusters; itb++){
1274 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1275 if(!cl->IsInChamber()) continue;
1276 if (!tracklets[ipl].IsUsable(itb)) continue;
1283 uvt[0] = 2. * x * t;
1285 uvt[2] = 2. * tilt * t;
1286 uvt[3] = 2. * tilt * dx * t;
1287 w = 2. * (y + tilt*z) * t;
1288 // error definition changes for the different calls
1290 we *= sigError ? TMath::Sqrt(cl->GetSigmaY2()+tilt*tilt*cl->GetSigmaZ2()) : 0.2;
1291 fitter->AddPoint(uvt, w, we);
1292 zfitter.AddPoint(&x, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
1293 // adding points for covariance matrix estimation
1294 erry = 1./(TMath::Sqrt(cl->GetSigmaY2()) + 0.1); // 0.1 is a systematic error (due to misalignment and miscalibration)
1296 errz = 1./cl->GetSigmaZ2();
1297 for(Int_t ipol = 0; ipol < 5; ipol++){
1298 sumPolY[ipol] += erry;
1301 sumPolZ[ipol] += errz;
1308 if (fitter->Eval()) return 1.e10;
1311 Double_t offset = fitter->GetParameter(3);
1312 Double_t slope = fitter->GetParameter(4);
1314 // Linear fitter - not possible to make boundaries
1315 // Do not accept non possible z and dzdx combinations
1316 Bool_t acceptablez = kTRUE;
1317 Double_t zref = 0.0;
1318 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
1319 if(!tracklets[iLayer].IsOK()) continue;
1320 zref = offset + slope * (tracklets[iLayer].GetX0() - xref);
1321 if (TMath::Abs(tracklets[iLayer].GetZfit(0) - zref) > tracklets[iLayer].GetPadLength() * 0.5 + 1.0)
1322 acceptablez = kFALSE;
1325 Double_t dzmf = zfitter.GetFunctionParameter(1);
1326 Double_t zmf = zfitter.GetFunctionValue(&xref);
1327 fgTiltedRieman->FixParameter(3, zmf);
1328 fgTiltedRieman->FixParameter(4, dzmf);
1330 fitter->ReleaseParameter(3);
1331 fitter->ReleaseParameter(4);
1332 offset = fitter->GetParameter(3);
1333 slope = fitter->GetParameter(4);
1336 // Calculate Curvarture
1337 Double_t a = fitter->GetParameter(0);
1338 Double_t b = fitter->GetParameter(1);
1339 Double_t c = fitter->GetParameter(2);
1340 Double_t curvature = 1.0 + b*b - c*a;
1341 if (curvature > 0.0) curvature = a / TMath::Sqrt(curvature);
1343 Double_t chi2track = fitter->GetChisquare()/Double_t(nPoints);
1345 // Prepare error calculation
1346 TMatrixD covarPolY(3,3);
1347 covarPolY(0,0) = sumPolY[0]; covarPolY(1,1) = sumPolY[2]; covarPolY(2,2) = sumPolY[4];
1348 covarPolY(0,1) = covarPolY(1,0) = sumPolY[1];
1349 covarPolY(0,2) = covarPolY(2,0) = sumPolY[2];
1350 covarPolY(2,1) = covarPolY(1,2) = sumPolY[3];
1352 TMatrixD covarPolZ(2,2);
1353 covarPolZ(0,0) = sumPolZ[0]; covarPolZ(1,1) = sumPolZ[2];
1354 covarPolZ(1,0) = covarPolZ(0,1) = sumPolZ[1];
1357 // Update the tracklets
1360 memset(cov, 0, sizeof(Double_t) * 15);
1361 for(Int_t iLayer = 0; iLayer < AliTRDtrackerV1::kNPlanes; iLayer++) {
1363 x = tracklets[iLayer].GetX0();
1369 memset(cov, 0, sizeof(Double_t) * 3);
1370 TMatrixD transform(3,3);
1373 transform(0,2) = x*x;
1377 TMatrixD covariance(transform, TMatrixD::kMult, covarPolY);
1378 covariance *= transform.T();
1379 TMatrixD transformZ(2,2);
1380 transformZ(0,0) = transformZ(1,1) = 1;
1381 transformZ(0,1) = x;
1382 TMatrixD covarZ(transformZ, TMatrixD::kMult, covarPolZ);
1383 covarZ *= transformZ.T();
1384 // y: R^2 = (x - x0)^2 + (y - y0)^2
1385 // => y = y0 +/- Sqrt(R^2 - (x - x0)^2)
1386 // R = Sqrt() = 1/Curvature
1387 // => y = y0 +/- Sqrt(1/Curvature^2 - (x - x0)^2)
1388 Double_t res = (x * a + b); // = (x - x0)/y0
1390 res = 1.0 - c * a + b * b - res; // = (R^2 - (x - x0)^2)/y0^2
1392 res = TMath::Sqrt(res);
1393 y = (1.0 - res) / a;
1395 cov[0] = covariance(0,0);
1396 cov[2] = covarZ(0,0);
1399 // dy: R^2 = (x - x0)^2 + (y - y0)^2
1400 // => y = +/- Sqrt(R^2 - (x - x0)^2) + y0
1401 // => dy/dx = (x - x0)/Sqrt(R^2 - (x - x0)^2)
1402 // Curvature: cr = 1/R = a/Sqrt(1 + b^2 - c*a)
1403 // => dy/dx = (x - x0)/(1/(cr^2) - (x - x0)^2)
1404 Double_t x0 = -b / a;
1405 if (-c * a + b * b + 1 > 0) {
1406 if (1.0/(curvature * curvature) - (x - x0) * (x - x0) > 0.0) {
1407 Double_t yderiv = (x - x0) / TMath::Sqrt(1.0/(curvature * curvature) - (x - x0) * (x - x0));
1408 if (a < 0) yderiv *= -1.0;
1412 z = offset + slope * (x - xref);
1414 tracklets[iLayer].SetYref(0, y);
1415 tracklets[iLayer].SetYref(1, dy);
1416 tracklets[iLayer].SetZref(0, z);
1417 tracklets[iLayer].SetZref(1, dz);
1418 tracklets[iLayer].SetC(curvature);
1419 tracklets[iLayer].SetCovRef(cov);
1420 tracklets[iLayer].SetChi2(chi2track);
1422 if(AliLog::GetDebugLevel("TRD", "AliTRDtrackerV1")>3) printf("D-AliTRDtrackerV1::FitTiltedRieman: Chi2[%f] C[%5.2e] pt[%8.3f]\n", chi2track, curvature, GetBz()*kB2C/curvature);
1424 /* if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) >=5){
1425 TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
1426 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
1427 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
1428 Double_t chi2z = CalculateChi2Z(tracklets, offset, slope, xref);
1429 cstreamer << "FitTiltedRieman0"
1430 << "EventNumber=" << eventNumber
1431 << "CandidateNumber=" << candidateNumber
1433 << "Chi2Z=" << chi2z
1440 //____________________________________________________________________
1441 Double_t AliTRDtrackerV1::FitLine(const AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t err, Int_t np, AliTrackPoint *points)
1444 // Fit track with a staight line
1445 // Fills an AliTrackPoint array with np points
1446 // Function should be used to refit tracks when no magnetic field was on
1448 AliTRDLeastSquare yfitter, zfitter;
1449 AliTRDcluster *cl = NULL;
1451 AliTRDseedV1 work[kNPlanes], *tracklet = NULL;
1453 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1454 if(!(tracklet = track->GetTracklet(ipl))) continue;
1455 if(!tracklet->IsOK()) continue;
1456 new(&work[ipl]) AliTRDseedV1(*tracklet);
1458 tracklets = &work[0];
1461 Double_t xref = CalculateReferenceX(tracklets);
1462 Double_t x, y, z, dx, ye, yr, tilt;
1463 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1464 if(!tracklets[ipl].IsOK()) continue;
1465 for(Int_t itb = 0; itb < fgNTimeBins; itb++){
1466 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1467 if (!tracklets[ipl].IsUsable(itb)) continue;
1471 zfitter.AddPoint(&dx, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
1475 Double_t z0 = zfitter.GetFunctionParameter(0);
1476 Double_t dzdx = zfitter.GetFunctionParameter(1);
1477 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1478 if(!tracklets[ipl].IsOK()) continue;
1479 for(Int_t itb = 0; itb < fgNTimeBins; itb++){
1480 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1481 if (!tracklets[ipl].IsUsable(itb)) continue;
1485 tilt = tracklets[ipl].GetTilt();
1487 yr = y + tilt*(z - z0 - dzdx*dx);
1488 // error definition changes for the different calls
1489 ye = tilt*TMath::Sqrt(cl->GetSigmaZ2());
1490 ye += err ? tracklets[ipl].GetSigmaY() : 0.2;
1491 yfitter.AddPoint(&dx, yr, ye);
1495 Double_t y0 = yfitter.GetFunctionParameter(0);
1496 Double_t dydx = yfitter.GetFunctionParameter(1);
1497 Double_t chi2 = 0.;//yfitter.GetChisquare()/Double_t(nPoints);
1499 //update track points array
1502 for(int ip=0; ip<np; ip++){
1503 points[ip].GetXYZ(xyz);
1504 xyz[1] = y0 + dydx * (xyz[0] - xref);
1505 xyz[2] = z0 + dzdx * (xyz[0] - xref);
1506 points[ip].SetXYZ(xyz);
1513 //_________________________________________________________________________
1514 Double_t AliTRDtrackerV1::FitRiemanTilt(const AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t sigError, Int_t np, AliTrackPoint *points)
1517 // Performs a Riemann fit taking tilting pad correction into account
1519 // Paramters: - Array of tracklets (connected to the track candidate)
1520 // - Flag selecting the error definition
1521 // Output: - Chi2 values of the track (in Parameter list)
1523 // The equations which has to be solved simultaneously are:
1525 // R^{2} = (x-x_{0})^{2} + (y^{*}-y_{0})^{2}
1526 // y^{*} = y - tg(h)(z - z_{t})
1527 // z_{t} = z_{0}+dzdx*(x-x_{r})
1529 // with (x, y, z) the coordinate of the cluster, (x_0, y_0, z_0) the coordinate of the center of the Riemann circle,
1530 // R its radius, x_r a constant refrence radial position in the middle of the TRD stack and dzdx the slope of the
1531 // track in the x-z plane. Using the following transformations
1533 // t = 1 / (x^{2} + y^{2})
1535 // v = 2 * tan(h) * t
1536 // w = 2 * tan(h) * (x - x_{r}) * t
1538 // One gets the following linear equation
1540 // a + b * u + c * t + d * v + e * w = 2 * (y + tg(h) * z) * t
1542 // where the coefficients have the following meaning
1546 // c = (R^{2} -x_{0}^{2} - y_{0}^{2})/y_{0}
1550 // The error calculation for the free term is thus
1552 // #sigma = 2 * #sqrt{#sigma^{2}_{y} + (tilt corr ...) + tg^{2}(h) * #sigma^{2}_{z}} * t
1555 // From this simple model one can compute chi^2 estimates and a rough approximation of pt from the curvature according
1558 // C = 1/R = a/(1 + b^{2} + c*a)
1562 // M.Ivanov <M.Ivanov@gsi.de>
1563 // A.Bercuci <A.Bercuci@gsi.de>
1564 // M.Fasel <M.Fasel@gsi.de>
1566 TLinearFitter *fitter = GetTiltedRiemanFitter();
1567 fitter->StoreData(kTRUE);
1568 fitter->ClearPoints();
1569 AliTRDLeastSquare zfitter;
1570 AliTRDcluster *cl = NULL;
1572 AliTRDseedV1 work[kNPlanes], *tracklet = NULL;
1574 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1575 if(!(tracklet = track->GetTracklet(ipl))) continue;
1576 if(!tracklet->IsOK()) continue;
1577 new(&work[ipl]) AliTRDseedV1(*tracklet);
1579 tracklets = &work[0];
1582 Double_t xref = CalculateReferenceX(tracklets);
1583 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);
1584 Double_t x, y, z, t, tilt, dx, w, we;
1587 // Containers for Least-square fitter
1588 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1589 if(!tracklets[ipl].IsOK()) continue;
1590 for(Int_t itb = 0; itb < AliTRDseedV1::kNclusters; itb++){
1591 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1592 //if (!tracklets[ipl].IsUsable(itb)) continue;
1596 tilt = tracklets[ipl].GetTilt();
1600 uvt[0] = 2. * x * t;
1602 uvt[2] = 2. * tilt * t;
1603 uvt[3] = 2. * tilt * dx * t;
1604 w = 2. * (y + tilt*z) * t;
1605 // error definition changes for the different calls
1607 we *= sigError ? TMath::Sqrt(cl->GetSigmaY2()) : 0.2;
1608 fitter->AddPoint(uvt, w, we);
1609 zfitter.AddPoint(&x, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
1613 if(fitter->Eval()) return 1.E10;
1615 Double_t z0 = fitter->GetParameter(3);
1616 Double_t dzdx = fitter->GetParameter(4);
1619 // Linear fitter - not possible to make boundaries
1620 // Do not accept non possible z and dzdx combinations
1621 Bool_t accept = kTRUE;
1622 Double_t zref = 0.0;
1623 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
1624 if(!tracklets[iLayer].IsOK()) continue;
1625 zref = z0 + dzdx * (tracklets[iLayer].GetX0() - xref);
1626 if (TMath::Abs(tracklets[iLayer].GetZfit(0) - zref) > tracklets[iLayer].GetPadLength() * 0.5 + 1.0)
1631 Double_t dzmf = zfitter.GetFunctionParameter(1);
1632 Double_t zmf = zfitter.GetFunctionValue(&xref);
1633 fitter->FixParameter(3, zmf);
1634 fitter->FixParameter(4, dzmf);
1636 fitter->ReleaseParameter(3);
1637 fitter->ReleaseParameter(4);
1638 z0 = fitter->GetParameter(3); // = zmf ?
1639 dzdx = fitter->GetParameter(4); // = dzmf ?
1642 // Calculate Curvature
1643 Double_t a = fitter->GetParameter(0);
1644 Double_t b = fitter->GetParameter(1);
1645 Double_t c = fitter->GetParameter(2);
1646 Double_t y0 = 1. / a;
1647 Double_t x0 = -b * y0;
1648 Double_t tmp = y0*y0 + x0*x0 - c*y0;
1649 if(tmp<=0.) return 1.E10;
1650 Double_t radius = TMath::Sqrt(tmp);
1651 Double_t curvature = 1.0 + b*b - c*a;
1652 if (curvature > 0.0) curvature = a / TMath::Sqrt(curvature);
1654 // Calculate chi2 of the fit
1655 Double_t chi2 = fitter->GetChisquare()/Double_t(nPoints);
1656 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);
1658 // Update the tracklets
1660 for(Int_t ip = 0; ip < kNPlanes; ip++) {
1661 x = tracklets[ip].GetX0();
1662 tmp = radius*radius-(x-x0)*(x-x0);
1663 if(tmp <= 0.) continue;
1664 tmp = TMath::Sqrt(tmp);
1666 // y: R^2 = (x - x0)^2 + (y - y0)^2
1667 // => y = y0 +/- Sqrt(R^2 - (x - x0)^2)
1668 tracklets[ip].SetYref(0, y0 - (y0>0.?1.:-1)*tmp);
1669 // => dy/dx = (x - x0)/Sqrt(R^2 - (x - x0)^2)
1670 tracklets[ip].SetYref(1, (x - x0) / tmp);
1671 tracklets[ip].SetZref(0, z0 + dzdx * (x - xref));
1672 tracklets[ip].SetZref(1, dzdx);
1673 tracklets[ip].SetC(curvature);
1674 tracklets[ip].SetChi2(chi2);
1677 //update track points array
1680 for(int ip=0; ip<np; ip++){
1681 points[ip].GetXYZ(xyz);
1682 xyz[1] = TMath::Abs(xyz[0] - x0) > radius ? 100. : y0 - (y0>0.?1.:-1.)*TMath::Sqrt((radius-(xyz[0]-x0))*(radius+(xyz[0]-x0)));
1683 xyz[2] = z0 + dzdx * (xyz[0] - xref);
1684 points[ip].SetXYZ(xyz);
1692 //____________________________________________________________________
1693 Double_t AliTRDtrackerV1::FitKalman(AliTRDtrackV1 *track, AliTRDseedV1 * const tracklets, Bool_t up, Int_t np, AliTrackPoint *points)
1695 // Kalman filter implementation for the TRD.
1696 // It returns the positions of the fit in the array "points"
1698 // Author : A.Bercuci@gsi.de
1700 // printf("Start track @ x[%f]\n", track->GetX());
1702 //prepare marker points along the track
1703 Int_t ip = np ? 0 : 1;
1705 if((up?-1:1) * (track->GetX() - points[ip].GetX()) > 0.) break;
1706 //printf("AliTRDtrackerV1::FitKalman() : Skip track marker x[%d] = %7.3f. Before track start ( %7.3f ).\n", ip, points[ip].GetX(), track->GetX());
1709 //if(points) printf("First marker point @ x[%d] = %f\n", ip, points[ip].GetX());
1712 AliTRDseedV1 tracklet;
1713 AliTRDseedV1 *ptrTracklet = NULL;
1715 //Loop through the TRD planes
1716 for (Int_t jplane = 0; jplane < kNPlanes; jplane++) {
1717 // GET TRACKLET OR BUILT IT
1718 Int_t iplane = up ? jplane : kNPlanes - 1 - jplane;
1720 if(!(ptrTracklet = &tracklets[iplane])) continue;
1722 if(!(ptrTracklet = track->GetTracklet(iplane))){
1723 /*AliTRDtrackerV1 *tracker = NULL;
1724 if(!(tracker = dynamic_cast<AliTRDtrackerV1*>( AliTRDrecoParam:Tracker()))) continue;
1725 ptrTracklet = new(&tracklet) AliTRDseedV1(iplane);
1726 if(!tracker->MakeTracklet(ptrTracklet, track)) */
1730 if(!ptrTracklet->IsOK()) continue;
1732 Double_t x = ptrTracklet->GetX0();
1735 //don't do anything if next marker is after next update point.
1736 if((up?-1:1) * (points[ip].GetX() - x) - AliTRDReconstructor::GetMaxStep() < 0) break;
1737 if(((up?-1:1) * (points[ip].GetX() - track->GetX()) < 0) && !PropagateToX(*track, points[ip].GetX(), AliTRDReconstructor::GetMaxStep())) return -1.;
1739 Double_t xyz[3]; // should also get the covariance
1741 track->Global2LocalPosition(xyz, track->GetAlpha());
1742 points[ip].SetXYZ(xyz[0], xyz[1], xyz[2]);
1745 // printf("plane[%d] tracklet[%p] x[%f]\n", iplane, ptrTracklet, x);
1747 // Propagate closer to the next update point
1748 if(((up?-1:1) * (x - track->GetX()) + AliTRDReconstructor::GetMaxStep() < 0) && !PropagateToX(*track, x + (up?-1:1)*AliTRDReconstructor::GetMaxStep(), AliTRDReconstructor::GetMaxStep())) return -1.;
1750 if(!AdjustSector(track)) return -1;
1751 if(TMath::Abs(track->GetSnp()) > AliTRDReconstructor::GetMaxSnp()) return -1;
1753 //load tracklet to the tracker and the track
1755 if((index = FindTracklet(ptrTracklet)) < 0){
1756 ptrTracklet = SetTracklet(&tracklet);
1757 index = fTracklets->GetEntriesFast()-1;
1759 track->SetTracklet(ptrTracklet, index);*/
1762 // register tracklet to track with tracklet creation !!
1763 // PropagateBack : loaded tracklet to the tracker and update index
1764 // RefitInward : update index
1765 // MakeTrack : loaded tracklet to the tracker and update index
1766 if(!tracklets) track->SetTracklet(ptrTracklet, -1);
1769 //Calculate the mean material budget along the path inside the chamber
1770 Double_t xyz0[3]; track->GetXYZ(xyz0);
1771 Double_t alpha = track->GetAlpha();
1772 Double_t xyz1[3], y, z;
1773 if(!track->GetProlongation(x, y, z)) return -1;
1774 xyz1[0] = x * TMath::Cos(alpha) - y * TMath::Sin(alpha);
1775 xyz1[1] = +x * TMath::Sin(alpha) + y * TMath::Cos(alpha);
1777 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
1779 if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param) <=0.) break;
1780 Double_t xrho = param[0]*param[4]; // density*length
1781 Double_t xx0 = param[1]; // radiation length
1783 //Propagate the track
1784 track->PropagateTo(x, xx0, xrho);
1785 if (!AdjustSector(track)) break;
1788 Double_t cov[3]; ptrTracklet->GetCovAt(x, cov);
1789 Double_t p[2] = { ptrTracklet->GetY(), ptrTracklet->GetZ()};
1790 Double_t chi2 = ((AliExternalTrackParam*)track)->GetPredictedChi2(p, cov);
1791 if(chi2<1e+10) ((AliExternalTrackParam*)track)->Update(p, cov);
1794 //Reset material budget if 2 consecutive gold
1795 if(iplane>0 && track->GetTracklet(iplane-1) && ptrTracklet->GetN() + track->GetTracklet(iplane-1)->GetN() > 20) track->SetBudget(2, 0.);
1796 } // end planes loop
1800 if(((up?-1:1) * (points[ip].GetX() - track->GetX()) < 0) && !PropagateToX(*track, points[ip].GetX(), AliTRDReconstructor::GetMaxStep())) return -1.;
1802 Double_t xyz[3]; // should also get the covariance
1804 track->Global2LocalPosition(xyz, track->GetAlpha());
1805 points[ip].SetXYZ(xyz[0], xyz[1], xyz[2]);
1809 return track->GetChi2();
1812 //_________________________________________________________________________
1813 Float_t AliTRDtrackerV1::CalculateChi2Z(const AliTRDseedV1 *tracklets, Double_t offset, Double_t slope, Double_t xref)
1816 // Calculates the chi2-value of the track in z-Direction including tilting pad correction.
1817 // A linear dependence on the x-value serves as a model.
1818 // The parameters are related to the tilted Riemann fit.
1819 // Parameters: - Array of tracklets (AliTRDseedV1) related to the track candidate
1820 // - the offset for the reference x
1822 // - the reference x position
1823 // Output: - The Chi2 value of the track in z-Direction
1825 Float_t chi2Z = 0, nLayers = 0;
1826 for (Int_t iLayer = 0; iLayer < AliTRDgeometry::kNlayer; iLayer++) {
1827 if(!tracklets[iLayer].IsOK()) continue;
1828 Double_t z = offset + slope * (tracklets[iLayer].GetX0() - xref);
1829 chi2Z += TMath::Abs(tracklets[iLayer].GetZfit(0) - z);
1832 chi2Z /= TMath::Max((nLayers - 3.0),1.0);
1836 //_____________________________________________________________________________
1837 Int_t AliTRDtrackerV1::PropagateToX(AliTRDtrackV1 &t, Double_t xToGo, Double_t maxStep)
1840 // Starting from current X-position of track <t> this function
1841 // extrapolates the track up to radial position <xToGo> in steps of <maxStep>.
1842 // Returns 1 if track reaches the plane, and 0 otherwise
1845 // Current track X-position
1846 Double_t xpos = t.GetX()/*,
1847 mass = t.GetMass()*/;
1849 // Direction: inward or outward
1850 Double_t dir = (xpos < xToGo) ? 1.0 : -1.0;
1852 while (((xToGo - xpos) * dir) > AliTRDReconstructor::GetEpsilon()) {
1853 // printf("to go %f\n", (xToGo - xpos) * dir);
1861 // The next step size
1862 Double_t step = dir * TMath::Min(TMath::Abs(xToGo-xpos),maxStep);
1864 // Get the global position of the starting point
1867 // X-position after next step
1870 // Get local Y and Z at the X-position of the next step
1871 if(t.GetProlongation(x,y,z)<0) return 0; // No prolongation possible
1873 // The global position of the end point of this prolongation step
1874 xyz1[0] = x * TMath::Cos(t.GetAlpha()) - y * TMath::Sin(t.GetAlpha());
1875 xyz1[1] = +x * TMath::Sin(t.GetAlpha()) + y * TMath::Cos(t.GetAlpha());
1878 // Calculate the mean material budget between start and
1879 // end point of this prolongation step
1880 if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param)<=0.) return 0;
1882 // Propagate the track to the X-position after the next step
1883 if (!t.PropagateTo(x, param[1], param[0]*param[4])) return 0;
1885 /* // Correct for mean material budget
1887 bg(TMath::Abs(t.GetP()/mass));
1888 if(AliLog::GetDebugLevel("TRD", "AliTRDtrackerV1")>=3){
1889 const char *pn[] = {"rho", "x/X0", "<A>", "<Z>", "L", "<Z/A>", "Nb"};
1890 printf("D-AliTRDtrackerV1::PropagateTo(): x[%6.2f] bg[%6.2f]\n", xpos, bg);
1891 printf(" param :: %s[%e] %s[%e] %s[%e] %s[%e] %s[%e] %s[%e] %s[%e]\n"
1902 dEdx = AliExternalTrackParam::BetheBlochSolid(bg);
1905 dEdx = AliExternalTrackParam::BetheBlochGas(bg);
1908 { // mean exitation energy (GeV)
1909 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;
1910 Double_t mZA = param[5]>1.e-5?param[5]:(param[3]/param[2]);
1911 if(AliLog::GetDebugLevel("TRD", "AliTRDtrackerV1")>=3) printf("D-AliTRDtrackerV1::PropagateTo(): Mee[%e] <Z/A>[%e]\n", mee, mZA);
1912 // protect against failed calculation of rho in MeanMaterialBudget()
1913 dEdx = AliExternalTrackParam::BetheBlochGeant(bg, param[0]>1.e-6?param[0]:2.33, 0.2, 3., mee, mZA);
1917 if(AliLog::GetDebugLevel("TRD", "AliTRDtrackerV1")>=2) printf("D-AliTRDtrackerV1::PropagateTo(): dEdx(bg=%e, m=%e)= %e[GeV/cm]\n", bg, mass, dEdx);
1918 if (!t.CorrectForMeanMaterialdEdx(param[1], dir*param[0]*param[4], mass, dEdx)) return 0;
1920 // Rotate the track if necessary
1921 if(!AdjustSector(&t)) return 0;
1923 // New track X-position
1932 //_____________________________________________________________________________
1933 Bool_t AliTRDtrackerV1::ReadClusters(TTree *clusterTree)
1936 // Reads AliTRDclusters from the file.
1937 // The names of the cluster tree and branches
1938 // should match the ones used in AliTRDclusterizer::WriteClusters()
1941 Int_t nsize = Int_t(clusterTree->GetTotBytes() / (sizeof(AliTRDcluster)));
1942 TObjArray *clusterArray = new TObjArray(nsize+1000);
1944 TBranch *branch = clusterTree->GetBranch("TRDcluster");
1946 AliError("Can't get the branch !");
1949 branch->SetAddress(&clusterArray);
1952 Float_t nclusters = fkRecoParam->GetNClusters();
1953 if(fkReconstructor->IsHLT()) nclusters /= AliTRDgeometry::kNsector;
1954 fClusters = new TClonesArray("AliTRDcluster", Int_t(nclusters));
1955 fClusters->SetOwner(kTRUE);
1957 AliInfo(Form("Tracker owning clusters @ %p", (void*)fClusters));
1960 // Loop through all entries in the tree
1961 Int_t nEntries = (Int_t) clusterTree->GetEntries();
1964 AliTRDcluster *c = NULL;
1965 for (Int_t iEntry = 0; iEntry < nEntries; iEntry++) {
1967 nbytes += clusterTree->GetEvent(iEntry);
1969 // Get the number of points in the detector
1970 Int_t nCluster = clusterArray->GetEntriesFast();
1971 for (Int_t iCluster = 0; iCluster < nCluster; iCluster++) {
1972 if(!(c = (AliTRDcluster *) clusterArray->UncheckedAt(iCluster))) continue;
1973 new((*fClusters)[ncl++]) AliTRDcluster(*c);
1974 delete (clusterArray->RemoveAt(iCluster));
1977 delete clusterArray;
1982 //_____________________________________________________________________________
1983 Int_t AliTRDtrackerV1::LoadClusters(TTree *cTree)
1986 // Fills clusters into TRD tracking sectors
1989 fkRecoParam = fkReconstructor->GetRecoParam(); // load reco param for this event
1991 // if(!fkReconstructor->IsWritingClusters()) AliInfo(Form("IsWritingClusters[%c]", fkReconstructor->IsWritingClusters()?'y':'n'));
1992 if(!(fClusters = AliTRDReconstructor::GetClusters())){
1993 AliWarning("Clusters unavailable from TRD reconstructor. Trying reading from tree ...");
1995 if(!ReadClusters(cTree)) {
1996 AliError("Reading clusters from tree failed.");
2001 if(!fClusters || !fClusters->GetEntriesFast()){
2002 AliInfo("No TRD clusters");
2004 } else AliInfo(Form("Using :: clusters[%d] onl.tracklets[%d] onl.tracks[%d]",
2005 fClusters?fClusters->GetEntriesFast():0,
2006 AliTRDReconstructor::GetTracklets()?AliTRDReconstructor::GetTracklets()->GetEntriesFast():0,
2007 AliTRDReconstructor::GetTracks()?AliTRDReconstructor::GetTracks()->GetEntriesFast():0));
2009 BuildTrackingContainers();
2014 //_____________________________________________________________________________
2015 Int_t AliTRDtrackerV1::LoadClusters(TClonesArray * const clusters)
2018 // Fills clusters into TRD tracking sectors
2019 // Function for use in the HLT
2021 if(!clusters || !clusters->GetEntriesFast()){
2022 AliInfo("No TRD clusters");
2024 } else AliInfo(Form("Using :: external.clusters[%d]", clusters->GetEntriesFast()));
2027 fClusters = clusters;
2029 fkRecoParam = fkReconstructor->GetRecoParam(); // load reco param for this event
2030 BuildTrackingContainers();
2036 //____________________________________________________________________
2037 Int_t AliTRDtrackerV1::BuildTrackingContainers()
2039 // Building tracking containers for clusters
2041 Int_t nin(0), ncl(fClusters->GetEntriesFast());
2043 AliTRDcluster *c = (AliTRDcluster *) fClusters->UncheckedAt(ncl);
2044 if(c->IsInChamber()) nin++;
2045 if(fkReconstructor->IsHLT()) c->SetRPhiMethod(AliTRDcluster::kCOG);
2046 Int_t detector = c->GetDetector();
2047 Int_t sector = fGeom->GetSector(detector);
2048 Int_t stack = fGeom->GetStack(detector);
2049 Int_t layer = fGeom->GetLayer(detector);
2051 fTrSec[sector].GetChamber(stack, layer, kTRUE)->InsertCluster(c, ncl);
2054 for(int isector =0; isector<AliTRDgeometry::kNsector; isector++){
2055 if(!fTrSec[isector].GetNChambers()) continue;
2056 fTrSec[isector].Init(fkReconstructor);
2064 //____________________________________________________________________
2065 void AliTRDtrackerV1::UnloadClusters()
2068 // Clears the arrays of clusters and tracks. Resets sectors and timebins
2069 // If option "force" is also set the containers are also deleted. This is useful
2074 if(HasRemoveContainers()){delete fTracks; fTracks = NULL;}
2077 fTracklets->Delete();
2078 if(HasRemoveContainers()){delete fTracklets; fTracklets = NULL;}
2080 if(fClusters && IsClustersOwner()){
2081 AliInfo(Form("tracker[%p] clearing %d own clusters @ %p", (void*)this, fClusters->GetEntries(), (void*)fClusters));
2082 fClusters->Delete();
2084 // // save clusters array in the reconstructor for further use.
2085 // if(!fkReconstructor->IsWritingClusters()){
2086 // AliTRDReconstructor::SetClusters(fClusters);
2087 // SetClustersOwner(kFALSE);
2088 // } else AliTRDReconstructor::SetClusters(NULL);
2091 for (int i = 0; i < AliTRDgeometry::kNsector; i++) fTrSec[i].Clear();
2093 // Increment the Event Number
2094 AliTRDtrackerDebug::SetEventNumber(AliTRDtrackerDebug::GetEventNumber() + 1);
2097 // //____________________________________________________________________
2098 // void AliTRDtrackerV1::UseClusters(const AliKalmanTrack *t, Int_t) const
2100 // const AliTRDtrackV1 *track = dynamic_cast<const AliTRDtrackV1*>(t);
2101 // if(!track) return;
2103 // AliTRDseedV1 *tracklet = NULL;
2104 // for(Int_t ily=AliTRDgeometry::kNlayer; ily--;){
2105 // if(!(tracklet = track->GetTracklet(ily))) continue;
2106 // AliTRDcluster *c = NULL;
2107 // for(Int_t ic=AliTRDseed::kNclusters; ic--;){
2108 // if(!(c=tracklet->GetClusters(ic))) continue;
2115 //_____________________________________________________________________________
2116 Bool_t AliTRDtrackerV1::AdjustSector(AliTRDtrackV1 *const track)
2119 // Rotates the track when necessary
2122 Double_t alpha = AliTRDgeometry::GetAlpha();
2123 Double_t y = track->GetY();
2124 Double_t ymax = track->GetX()*TMath::Tan(0.5*alpha);
2127 if (!track->Rotate( alpha)) {
2131 else if (y < -ymax) {
2132 if (!track->Rotate(-alpha)) {
2142 //____________________________________________________________________
2143 AliTRDseedV1* AliTRDtrackerV1::GetTracklet(const AliTRDtrackV1 *const track, Int_t p, Int_t &idx)
2145 // Find tracklet for TRD track <track>
2154 // Detailed description
2156 idx = track->GetTrackletIndex(p);
2157 AliTRDseedV1 *tracklet = (idx<0) ? NULL : (AliTRDseedV1*)fTracklets->UncheckedAt(idx);
2162 //____________________________________________________________________
2163 AliTRDseedV1* AliTRDtrackerV1::SetTracklet(const AliTRDseedV1 * const tracklet)
2165 // Add this tracklet to the list of tracklets stored in the tracker
2168 // - tracklet : pointer to the tracklet to be added to the list
2171 // - the index of the new tracklet in the tracker tracklets list
2173 // Detailed description
2174 // Build the tracklets list if it is not yet created (late initialization)
2175 // and adds the new tracklet to the list.
2178 fTracklets = new TClonesArray("AliTRDseedV1", AliTRDgeometry::Nsector()*kMaxTracksStack);
2179 fTracklets->SetOwner(kTRUE);
2181 Int_t nentries = fTracklets->GetEntriesFast();
2182 return new ((*fTracklets)[nentries]) AliTRDseedV1(*tracklet);
2185 //____________________________________________________________________
2186 AliTRDtrackV1* AliTRDtrackerV1::SetTrack(const AliTRDtrackV1 * const track)
2188 // Add this track to the list of tracks stored in the tracker
2191 // - track : pointer to the track to be added to the list
2194 // - the pointer added
2196 // Detailed description
2197 // Build the tracks list if it is not yet created (late initialization)
2198 // and adds the new track to the list.
2201 fTracks = new TClonesArray("AliTRDtrackV1", AliTRDgeometry::Nsector()*kMaxTracksStack);
2202 fTracks->SetOwner(kTRUE);
2204 Int_t nentries = fTracks->GetEntriesFast();
2205 return new ((*fTracks)[nentries]) AliTRDtrackV1(*track);
2210 //____________________________________________________________________
2211 Int_t AliTRDtrackerV1::Clusters2TracksSM(Int_t sector, AliESDEvent *esd)
2214 // Steer tracking for one SM.
2217 // sector : Array of (SM) propagation layers containing clusters
2218 // esd : The current ESD event. On output it contains the also
2219 // the ESD (TRD) tracks found in this SM.
2222 // Number of tracks found in this TRD supermodule.
2224 // Detailed description
2226 // 1. Unpack AliTRDpropagationLayers objects for each stack.
2227 // 2. Launch stack tracking.
2228 // See AliTRDtrackerV1::Clusters2TracksStack() for details.
2229 // 3. Pack results in the ESD event.
2233 Int_t nChambers = 0;
2234 AliTRDtrackingChamber **stack = NULL, *chamber = NULL;
2235 for(int istack = 0; istack<AliTRDgeometry::kNstack; istack++){
2236 if(!(stack = fTrSec[sector].GetStack(istack))) continue;
2238 for(int ilayer=0; ilayer<AliTRDgeometry::kNlayer; ilayer++){
2239 if(!(chamber = stack[ilayer])) continue;
2240 if(chamber->GetNClusters() < fgNTimeBins * fkRecoParam->GetFindableClusters()) continue;
2242 //AliInfo(Form("sector %d stack %d layer %d clusters %d", sector, istack, ilayer, chamber->GetNClusters()));
2244 if(nChambers < 4) continue;
2245 //AliInfo(Form("Doing stack %d", istack));
2246 nTracks += Clusters2TracksStack(stack, fTracksESD);
2248 if(nTracks) AliDebug(2, Form("Number of tracks: SM_%02d[%d]", sector, nTracks));
2250 for(int itrack=0; itrack<nTracks; itrack++){
2251 AliESDtrack *esdTrack((AliESDtrack*)(fTracksESD->operator[](itrack)));
2252 Int_t id = esd->AddTrack(esdTrack);
2254 // set ESD id to stand alone TRD tracks
2255 if (fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 0){
2256 esdTrack=esd->GetTrack(id);
2257 TObject *o(NULL); Int_t ic(0);
2258 AliTRDtrackV1 *calibTrack(NULL);
2259 while((o = esdTrack->GetCalibObject(ic++))){
2260 if(!(calibTrack = dynamic_cast<AliTRDtrackV1*>(o))) continue;
2261 calibTrack->SetESDid(esdTrack->GetID());
2267 // Reset Track and Candidate Number
2268 AliTRDtrackerDebug::SetCandidateNumber(0);
2269 AliTRDtrackerDebug::SetTrackNumber(0);
2271 // delete ESD tracks in the array
2272 fTracksESD->Delete();
2276 //____________________________________________________________________
2277 Int_t AliTRDtrackerV1::Clusters2TracksStack(AliTRDtrackingChamber **stack, TClonesArray * const esdTrackList)
2280 // Make tracks in one TRD stack.
2283 // layer : Array of stack propagation layers containing clusters
2284 // esdTrackList : Array of ESD tracks found by the stand alone tracker.
2285 // On exit the tracks found in this stack are appended.
2288 // Number of tracks found in this stack.
2290 // Detailed description
2292 // 1. Find the 3 most useful seeding chambers. See BuildSeedingConfigs() for details.
2293 // 2. Steer AliTRDtrackerV1::MakeSeeds() for 3 seeding layer configurations.
2294 // See AliTRDtrackerV1::MakeSeeds() for more details.
2295 // 3. Arrange track candidates in decreasing order of their quality
2296 // 4. Classify tracks in 5 categories according to:
2297 // a) number of layers crossed
2299 // 5. Sign clusters by tracks in decreasing order of track quality
2300 // 6. Build AliTRDtrack out of seeding tracklets
2302 // 8. Build ESD track and register it to the output list
2305 AliTRDtrackingChamber *chamber = NULL;
2306 AliTRDtrackingChamber **ci = NULL;
2307 AliTRDseedV1 sseed[kMaxTracksStack*6]; // to be initialized
2308 Int_t pars[4]; // MakeSeeds parameters
2310 //Double_t alpha = AliTRDgeometry::GetAlpha();
2311 //Double_t shift = .5 * alpha;
2312 Int_t configs[kNConfigs];
2314 // Purge used clusters from the containers
2316 for(Int_t ic = kNPlanes; ic--; ci++){
2317 if(!(*ci)) continue;
2321 // Build initial seeding configurations
2322 Double_t quality = BuildSeedingConfigs(stack, configs);
2323 if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 10){
2324 AliInfo(Form("Plane config %d %d %d Quality %f"
2325 , configs[0], configs[1], configs[2], quality));
2329 // Initialize contors
2330 Int_t ntracks, // number of TRD track candidates
2331 ntracks1, // number of registered TRD tracks/iter
2332 ntracks2 = 0; // number of all registered TRD tracks in stack
2336 Int_t ic = 0; ci = &stack[0];
2337 while(ic<kNPlanes && !(*ci)){ic++; ci++;}
2338 if(!(*ci)) return ntracks2;
2339 Int_t istack = fGeom->GetStack((*ci)->GetDetector());
2342 // Loop over seeding configurations
2343 ntracks = 0; ntracks1 = 0;
2344 for (Int_t iconf = 0; iconf<fkRecoParam->GetNumberOfSeedConfigs(); iconf++) {
2345 pars[0] = configs[iconf];
2348 ntracks = MakeSeeds(stack, &sseed[6*ntracks], pars);
2349 //AliInfo(Form("Number of Tracks after iteration step %d: %d\n", iconf, ntracks));
2350 if(ntracks == kMaxTracksStack) break;
2352 AliDebug(2, Form("Candidate TRD tracks %d in iteration %d.", ntracks, fSieveSeeding));
2355 // Sort the seeds according to their quality
2356 Int_t sort[kMaxTracksStack+1];
2357 TMath::Sort(ntracks, fTrackQuality, sort, kTRUE);
2358 if(AliLog::GetDebugLevel("TRD", "AliTRDtrackerV1") > 2){
2359 AliDebug(3, "Track candidates classification:");
2360 for (Int_t it(0); it < ntracks; it++) {
2362 printf(" %2d idx[%d] Quality[%e]\n", it, jt, fTrackQuality[jt]);
2366 // Initialize number of tracks so far and logic switches
2367 Int_t ntracks0 = esdTrackList->GetEntriesFast();
2368 Bool_t signedTrack[kMaxTracksStack];
2369 Bool_t fakeTrack[kMaxTracksStack];
2370 for (Int_t i=0; i<ntracks; i++){
2371 signedTrack[i] = kFALSE;
2372 fakeTrack[i] = kFALSE;
2374 //AliInfo("Selecting track candidates ...");
2376 // Sieve clusters in decreasing order of track quality
2377 Int_t jSieve(0), rejectedCandidates(0);
2379 // Check track candidates
2380 rejectedCandidates=0;
2381 for (Int_t itrack = 0; itrack < ntracks; itrack++) {
2382 Int_t trackIndex = sort[itrack];
2383 if (signedTrack[trackIndex] || fakeTrack[trackIndex]) continue;
2385 // Calculate track parameters from tracklets seeds
2390 for (Int_t jLayer = 0; jLayer < kNPlanes; jLayer++) {
2391 Int_t jseed = kNPlanes*trackIndex+jLayer;
2392 sseed[jseed].UpdateUsed();
2393 if(!sseed[jseed].IsOK()) continue;
2394 // check if primary candidate
2395 if (TMath::Abs(sseed[jseed].GetYref(0) / sseed[jseed].GetX0()) < 0.158) findable++;
2396 ncl += sseed[jseed].GetN();
2397 nused += sseed[jseed].GetNUsed();
2401 // Filter duplicated tracks
2403 AliDebug(4, Form("REJECTED : %d idx[%d] quality[%e] tracklets[%d] usedClusters[%d]", itrack, trackIndex, fTrackQuality[trackIndex], nlayers, nused));
2404 fakeTrack[trackIndex] = kTRUE;
2407 if (ncl>0 && Float_t(nused)/ncl >= .25){
2408 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));
2409 fakeTrack[trackIndex] = kTRUE;
2413 AliDebug(4, Form("Candidate[%d] Quality[%e] Tracklets[%d] Findable[%d] Ncl[%d] Nused[%d]", trackIndex, fTrackQuality[trackIndex], nlayers, findable, ncl, nused));
2416 Bool_t skip = kFALSE;
2418 case 0: // select 6 tracklets primary tracks, good quality
2419 if(nlayers > findable || nlayers < kNPlanes) {skip = kTRUE; break;}
2420 if(TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -5.){skip = kTRUE; break;}
2423 case 1: // select shorter primary tracks, good quality
2424 //if(findable<4){skip = kTRUE; break;}
2425 if(nlayers < findable){skip = kTRUE; break;}
2426 if(TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -4.){skip = kTRUE; break;}
2429 case 2: // select 6 tracklets secondary tracks
2430 if(nlayers < kNPlanes) { skip = kTRUE; break;}
2431 if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -6.0){skip = kTRUE; break;}
2434 case 3: // select shorter tracks, good quality
2435 if (nlayers<4){skip = kTRUE; break;}
2436 if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -5.){skip = kTRUE; break;}
2439 case 4: // select anything with at least 4 tracklets
2440 if (nlayers<4){skip = kTRUE; break;}
2441 //if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) - nused/(nlayers-3.0) < -15.0){skip = kTRUE; break;}
2445 rejectedCandidates++;
2446 AliDebug(4, Form("REJECTED : %d idx[%d] quality[%e] tracklets[%d] usedClusters[%d]", itrack, trackIndex, fTrackQuality[trackIndex], nlayers, nused));
2448 } else AliDebug(4, Form("ACCEPTED : %d idx[%d] quality[%e] tracklets[%d] usedClusters[%d]", itrack, trackIndex, fTrackQuality[trackIndex], nlayers, nused));
2450 signedTrack[trackIndex] = kTRUE;
2452 AliTRDseedV1 *lseed =&sseed[trackIndex*kNPlanes];
2453 AliTRDtrackV1 *track = MakeTrack(lseed);
2455 AliDebug(1, "Track building failed.");
2458 if(AliLog::GetDebugLevel("TRD", "AliTRDtrackerV1") > 1){
2459 Int_t ich = 0; while(!(chamber = stack[ich])) ich++;
2460 AliDebug(2, Form("Track pt=%7.2fGeV/c SM[%2d] Done.", track->Pt(), fGeom->GetSector(chamber->GetDetector())));
2464 if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 1 && fkReconstructor->IsDebugStreaming()){
2465 //AliInfo(Form("Track %d [%d] nlayers %d trackQuality = %e nused %d, yref = %3.3f", itrack, trackIndex, nlayers, fTrackQuality[trackIndex], nused, trackParams[1]));
2467 AliTRDseedV1 *dseed[6];
2468 for(Int_t iseed = AliTRDgeometry::kNlayer; iseed--;) dseed[iseed] = new AliTRDseedV1(lseed[iseed]);
2470 //Int_t eventNrInFile = esd->GetEventNumberInFile();
2471 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2472 Int_t trackNumber = AliTRDtrackerDebug::GetTrackNumber();
2473 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2474 TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
2475 cstreamer << "Clusters2TracksStack"
2476 << "EventNumber=" << eventNumber
2477 << "TrackNumber=" << trackNumber
2478 << "CandidateNumber=" << candidateNumber
2479 << "Iter=" << fSieveSeeding
2480 << "Like=" << fTrackQuality[trackIndex]
2481 << "S0.=" << dseed[0]
2482 << "S1.=" << dseed[1]
2483 << "S2.=" << dseed[2]
2484 << "S3.=" << dseed[3]
2485 << "S4.=" << dseed[4]
2486 << "S5.=" << dseed[5]
2488 << "NLayers=" << nlayers
2489 << "Findable=" << findable
2490 << "NUsed=" << nused
2495 AliESDtrack *esdTrack = new ((*esdTrackList)[ntracks0++]) AliESDtrack();
2496 esdTrack->UpdateTrackParams(track, AliESDtrack::kTRDout);
2497 esdTrack->SetLabel(track->GetLabel());
2498 track->UpdateESDtrack(esdTrack);
2499 // write ESD-friends if neccessary
2500 if (fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 0){
2501 AliTRDtrackV1 *calibTrack = new AliTRDtrackV1(*track);
2502 calibTrack->SetOwner();
2503 esdTrack->AddCalibObject(calibTrack);
2506 AliTRDtrackerDebug::SetTrackNumber(AliTRDtrackerDebug::GetTrackNumber() + 1);
2510 } while(jSieve<5 && rejectedCandidates); // end track candidates sieve
2511 if(!ntracks1) break;
2513 // increment counters
2514 ntracks2 += ntracks1;
2516 if(fkReconstructor->IsHLT()) break;
2519 // Rebuild plane configurations and indices taking only unused clusters into account
2520 quality = BuildSeedingConfigs(stack, configs);
2521 if(quality < 1.E-7) break; //fkReconstructor->GetRecoParam() ->GetPlaneQualityThreshold()) break;
2523 for(Int_t ip = 0; ip < kNPlanes; ip++){
2524 if(!(chamber = stack[ip])) continue;
2525 chamber->Build(fGeom);//Indices(fSieveSeeding);
2528 if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 10){
2529 AliInfo(Form("Sieve level %d Plane config %d %d %d Quality %f", fSieveSeeding, configs[0], configs[1], configs[2], quality));
2531 } while(fSieveSeeding<10); // end stack clusters sieve
2535 //AliInfo(Form("Registered TRD tracks %d in stack %d.", ntracks2, pars[1]));
2540 //___________________________________________________________________
2541 Double_t AliTRDtrackerV1::BuildSeedingConfigs(AliTRDtrackingChamber **stack, Int_t *configs)
2544 // Assign probabilities to chambers according to their
2545 // capability of producing seeds.
2549 // layers : Array of stack propagation layers for all 6 chambers in one stack
2550 // configs : On exit array of configuration indexes (see GetSeedingConfig()
2551 // for details) in the decreasing order of their seeding probabilities.
2555 // Return top configuration quality
2557 // Detailed description:
2559 // To each chamber seeding configuration (see GetSeedingConfig() for
2560 // the list of all configurations) one defines 2 quality factors:
2561 // - an apriori topological quality (see GetSeedingConfig() for details) and
2562 // - a data quality based on the uniformity of the distribution of
2563 // clusters over the x range (time bins population). See CookChamberQA() for details.
2564 // The overall chamber quality is given by the product of this 2 contributions.
2567 Double_t chamberQ[kNPlanes];memset(chamberQ, 0, kNPlanes*sizeof(Double_t));
2568 AliTRDtrackingChamber *chamber = NULL;
2569 for(int iplane=0; iplane<kNPlanes; iplane++){
2570 if(!(chamber = stack[iplane])) continue;
2571 chamberQ[iplane] = (chamber = stack[iplane]) ? chamber->GetQuality() : 0.;
2574 Double_t tconfig[kNConfigs];memset(tconfig, 0, kNConfigs*sizeof(Double_t));
2575 Int_t planes[] = {0, 0, 0, 0};
2576 for(int iconf=0; iconf<kNConfigs; iconf++){
2577 GetSeedingConfig(iconf, planes);
2578 tconfig[iconf] = fgTopologicQA[iconf];
2579 for(int iplane=0; iplane<4; iplane++) tconfig[iconf] *= chamberQ[planes[iplane]];
2582 TMath::Sort((Int_t)kNConfigs, tconfig, configs, kTRUE);
2583 // AliInfo(Form("q[%d] = %f", configs[0], tconfig[configs[0]]));
2584 // AliInfo(Form("q[%d] = %f", configs[1], tconfig[configs[1]]));
2585 // AliInfo(Form("q[%d] = %f", configs[2], tconfig[configs[2]]));
2587 return tconfig[configs[0]];
2590 //____________________________________________________________________
2591 Int_t AliTRDtrackerV1::MakeSeeds(AliTRDtrackingChamber **stack, AliTRDseedV1 * const sseed, const Int_t * const ipar)
2594 // Seed tracklets and build candidate TRD tracks. The procedure is used during barrel tracking to account for tracks which are
2595 // either missed by TPC prolongation or conversions inside the TRD volume.
2596 // For stand alone tracking the procedure is used to estimate all tracks measured by TRD.
2599 // layers : Array of stack propagation layers containing clusters
2600 // sseed : Array of empty tracklet seeds. On exit they are filled.
2601 // ipar : Control parameters:
2602 // ipar[0] -> seeding chambers configuration
2603 // ipar[1] -> stack index
2604 // ipar[2] -> number of track candidates found so far
2607 // Number of tracks candidates found.
2609 // The following steps are performed:
2610 // 1. Build seeding layers by collapsing all time bins from each of the four seeding chambers along the
2611 // radial coordinate. See AliTRDtrackingChamber::GetSeedingLayer() for details. The chambers selection for seeding
2612 // is described in AliTRDtrackerV1::Clusters2TracksStack().
2613 // 2. Using the seeding clusters from the seeding layer (step 1) build combinatorics using the following algorithm:
2614 // - for each seeding cluster in the lower seeding layer find
2615 // - all seeding clusters in the upper seeding layer inside a road defined by a given phi angle. The angle
2616 // is calculated on the minimum pt of tracks from vertex accesible to the stand alone tracker.
2617 // - for each pair of two extreme seeding clusters select middle upper cluster using roads defined externally by the
2619 // - select last seeding cluster as the nearest to the linear approximation of the track described by the first three
2620 // seeding clusters.
2621 // The implementation of road calculation and cluster selection can be found in the functions AliTRDchamberTimeBin::BuildCond()
2622 // and AliTRDchamberTimeBin::GetClusters().
2623 // 3. Helix fit of the seeding clusters set. (see AliTRDtrackerFitter::FitRieman(AliTRDcluster**)). No tilt correction is
2624 // performed at this level
2625 // 4. Initialize seeding tracklets in the seeding chambers.
2626 // 5. *Filter 0* Chi2 cut on the Y and Z directions. The threshold is set externally by the reco params.
2627 // 6. Attach (true) clusters to seeding tracklets (see AliTRDseedV1::AttachClusters()) and fit tracklet (see
2628 // AliTRDseedV1::Fit()). The number of used clusters used by current seeds should not exceed ... (25).
2629 // 7. *Filter 1* Check if all 4 seeding tracklets are correctly constructed.
2630 // 8. Helix fit of the clusters from the seeding tracklets with tilt correction. Refit tracklets using the new
2631 // approximation of the track.
2632 // 9. *Filter 2* Calculate likelihood of the track. (See AliTRDtrackerV1::CookLikelihood()). The following quantities are
2633 // checked against the Riemann fit:
2634 // - position resolution in y
2635 // - angular resolution in the bending plane
2636 // - likelihood of the number of clusters attached to the tracklet
2637 // 10. Extrapolation of the helix fit to the other 2 chambers *non seeding* chambers:
2638 // - Initialization of extrapolation tracklets with the fit parameters
2639 // - Attach clusters to extrapolated tracklets
2640 // - Helix fit of tracklets
2641 // 11. Improve seeding tracklets quality by reassigning clusters based on the last parameters of the track
2642 // See AliTRDtrackerV1::ImproveSeedQuality() for details.
2643 // 12. Helix fit of all 6 seeding tracklets and chi2 calculation
2644 // 13. Hyperplane fit and track quality calculation. See AliTRDtrackerFitter::FitHyperplane() for details.
2645 // 14. Cooking labels for tracklets. Should be done only for MC
2646 // 15. Register seeds.
2649 // Marian Ivanov <M.Ivanov@gsi.de>
2650 // Alexandru Bercuci <A.Bercuci@gsi.de>
2651 // Markus Fasel <M.Fasel@gsi.de>
2653 AliTRDtrackingChamber *chamber = NULL;
2654 AliTRDcluster *c[kNSeedPlanes] = {NULL, NULL, NULL, NULL}; // initilize seeding clusters
2655 AliTRDseedV1 *cseed = &sseed[0]; // initialize tracklets for first track
2656 Int_t ncl, mcl; // working variable for looping over clusters
2657 Int_t index[AliTRDchamberTimeBin::kMaxClustersLayer], jndex[AliTRDchamberTimeBin::kMaxClustersLayer];
2659 // chi2[0] = tracklet chi2 on the Z direction
2660 // chi2[1] = tracklet chi2 on the R direction
2663 // this should be data member of AliTRDtrack TODO
2664 // Double_t seedQuality[kMaxTracksStack];
2666 // unpack control parameters
2667 Int_t config = ipar[0];
2668 Int_t ntracks = ipar[1];
2669 Int_t istack = ipar[2];
2670 Int_t planes[kNSeedPlanes]; GetSeedingConfig(config, planes);
2671 Int_t planesExt[kNPlanes-kNSeedPlanes]; GetExtrapolationConfig(config, planesExt);
2674 // Init chambers geometry
2675 Double_t hL[kNPlanes]; // Tilting angle
2676 Float_t padlength[kNPlanes]; // pad lenghts
2677 Float_t padwidth[kNPlanes]; // pad widths
2678 AliTRDpadPlane *pp = NULL;
2679 for(int iplane=0; iplane<kNPlanes; iplane++){
2680 pp = fGeom->GetPadPlane(iplane, istack);
2681 hL[iplane] = TMath::Tan(TMath::DegToRad()*pp->GetTiltingAngle());
2682 padlength[iplane] = pp->GetLengthIPad();
2683 padwidth[iplane] = pp->GetWidthIPad();
2686 // Init anode wire position for chambers
2687 Double_t x0[kNPlanes], // anode wire position
2688 driftLength = .5*AliTRDgeometry::AmThick() - AliTRDgeometry::DrThick(); // drift length
2689 TGeoHMatrix *matrix = NULL;
2690 Double_t loc[] = {AliTRDgeometry::AnodePos(), 0., 0.};
2691 Double_t glb[] = {0., 0., 0.};
2692 AliTRDtrackingChamber **cIter = &stack[0];
2693 for(int iLayer=0; iLayer<kNPlanes; iLayer++,cIter++){
2694 if(!(*cIter)) continue;
2695 if(!(matrix = fGeom->GetClusterMatrix((*cIter)->GetDetector()))){
2696 x0[iLayer] = fgkX0[iLayer];
2699 matrix->LocalToMaster(loc, glb);
2700 x0[iLayer] = glb[0];
2703 AliDebug(2, Form("Making seeds Stack[%d] Config[%d] Tracks[%d]...", istack, config, ntracks));
2705 // Build seeding layers
2708 for(int isl=0; isl<kNSeedPlanes; isl++){
2709 if(!(chamber = stack[planes[isl]])) continue;
2710 if(!chamber->GetSeedingLayer(fSeedTB[isl], fGeom, fkReconstructor)) continue;
2713 if(nlayers < kNSeedPlanes) return ntracks;
2716 // Start finding seeds
2717 Double_t cond0[4], cond1[4], cond2[4];
2719 while((c[3] = (*fSeedTB[3])[icl++])){
2721 fSeedTB[0]->BuildCond(c[3], cond0, 0);
2722 fSeedTB[0]->GetClusters(cond0, index, ncl);
2723 //printf("Found c[3] candidates 0 %d\n", ncl);
2726 c[0] = (*fSeedTB[0])[index[jcl++]];
2728 Double_t dx = c[3]->GetX() - c[0]->GetX();
2729 Double_t dzdx = (c[3]->GetZ() - c[0]->GetZ())/dx;
2730 Double_t dydx = (c[3]->GetY() - c[0]->GetY())/dx;
2731 fSeedTB[1]->BuildCond(c[0], cond1, 1, dzdx, dydx);
2732 fSeedTB[1]->GetClusters(cond1, jndex, mcl);
2733 //printf("Found c[0] candidates 1 %d\n", mcl);
2737 c[1] = (*fSeedTB[1])[jndex[kcl++]];
2739 fSeedTB[2]->BuildCond(c[1], cond2, 2, dzdx, dydx);
2740 c[2] = fSeedTB[2]->GetNearestCluster(cond2);
2741 //printf("Found c[1] candidate 2 %p\n", c[2]);
2744 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].",
2745 c[0]->GetX(), c[0]->GetY(), c[0]->GetZ(),
2746 c[1]->GetX(), c[1]->GetY(), c[1]->GetZ(),
2747 c[2]->GetX(), c[2]->GetY(), c[2]->GetZ(),
2748 c[3]->GetX(), c[3]->GetY(), c[3]->GetZ()));
2750 for (Int_t il = 0; il < kNPlanes; il++) cseed[il].Reset();
2754 AliTRDseedV1 *tseed = &cseed[0];
2756 for(int iLayer=0; iLayer<kNPlanes; iLayer++, tseed++, cIter++){
2757 Int_t det = (*cIter) ? (*cIter)->GetDetector() : -1;
2758 tseed->SetDetector(det);
2759 tseed->SetTilt(hL[iLayer]);
2760 tseed->SetPadLength(padlength[iLayer]);
2761 tseed->SetPadWidth(padwidth[iLayer]);
2762 tseed->SetReconstructor(fkReconstructor);
2763 tseed->SetX0(det<0 ? fR[iLayer]+driftLength : x0[iLayer]);
2764 tseed->Init(GetRiemanFitter());
2765 tseed->SetStandAlone(kTRUE);
2768 Bool_t isFake = kFALSE;
2769 if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) >= 2 && fkReconstructor->IsDebugStreaming()){
2770 if (c[0]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
2771 if (c[1]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
2772 if (c[2]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
2775 for(Int_t l = 0; l < kNSeedPlanes; l++) xpos[l] = fSeedTB[l]->GetX();
2777 for(int il=0; il<4; il++) yref[il] = cseed[planes[il]].GetYref(0);
2778 Int_t ll = c[3]->GetLabel(0);
2779 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2780 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2781 AliRieman *rim = GetRiemanFitter();
2782 TTreeSRedirector &cs0 = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
2784 <<"EventNumber=" << eventNumber
2785 <<"CandidateNumber=" << candidateNumber
2786 <<"isFake=" << isFake
2787 <<"config=" << config
2789 <<"chi2z=" << chi2[0]
2790 <<"chi2y=" << chi2[1]
2791 <<"Y2exp=" << cond2[0]
2792 <<"Z2exp=" << cond2[1]
2793 <<"X0=" << xpos[0] //layer[sLayer]->GetX()
2794 <<"X1=" << xpos[1] //layer[sLayer + 1]->GetX()
2795 <<"X2=" << xpos[2] //layer[sLayer + 2]->GetX()
2796 <<"X3=" << xpos[3] //layer[sLayer + 3]->GetX()
2797 <<"yref0=" << yref[0]
2798 <<"yref1=" << yref[1]
2799 <<"yref2=" << yref[2]
2800 <<"yref3=" << yref[3]
2805 <<"Seed0.=" << &cseed[planes[0]]
2806 <<"Seed1.=" << &cseed[planes[1]]
2807 <<"Seed2.=" << &cseed[planes[2]]
2808 <<"Seed3.=" << &cseed[planes[3]]
2809 <<"RiemanFitter.=" << rim
2812 if(chi2[0] > fkRecoParam->GetChi2Z()/*7./(3. - sLayer)*//*iter*/){
2813 AliDebug(3, Form("Filter on chi2Z [%f].", chi2[0]));
2814 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2817 if(chi2[1] > fkRecoParam->GetChi2Y()/*1./(3. - sLayer)*//*iter*/){
2818 AliDebug(3, Form("Filter on chi2Y [%f].", chi2[1]));
2819 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2822 //AliInfo("Passed chi2 filter.");
2824 // try attaching clusters to tracklets
2826 AliTRDcluster *cl = NULL;
2827 for(int iLayer=0; iLayer<kNSeedPlanes; iLayer++){
2828 Int_t jLayer = planes[iLayer];
2829 Int_t nNotInChamber = 0;
2830 if(!cseed[jLayer].AttachClusters(stack[jLayer], kTRUE)) continue;
2831 if(/*fkReconstructor->IsHLT()*/kFALSE){
2832 cseed[jLayer].UpdateUsed();
2833 if(!cseed[jLayer].IsOK()) continue;
2835 cseed[jLayer].Fit();
2836 cseed[jLayer].UpdateUsed();
2837 cseed[jLayer].ResetClusterIter();
2838 while((cl = cseed[jLayer].NextCluster())){
2839 if(!cl->IsInChamber()) nNotInChamber++;
2841 //printf("clusters[%d], used[%d], not in chamber[%d]\n", cseed[jLayer].GetN(), cseed[jLayer].GetNUsed(), nNotInChamber);
2842 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
2847 if(mlayers < kNSeedPlanes){
2848 AliDebug(2, Form("Found only %d tracklets out of %d. Skip.", mlayers, kNSeedPlanes));
2849 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2853 // temporary exit door for the HLT
2854 if(fkReconstructor->IsHLT()){
2855 // attach clusters to extrapolation chambers
2856 for(int iLayer=0; iLayer<kNPlanes-kNSeedPlanes; iLayer++){
2857 Int_t jLayer = planesExt[iLayer];
2858 if(!(chamber = stack[jLayer])) continue;
2859 if(!cseed[jLayer].AttachClusters(chamber, kTRUE)) continue;
2860 cseed[jLayer].Fit();
2862 //FitTiltedRiemanConstraint(&cseed[0], GetZ());
2863 fTrackQuality[ntracks] = 1.; // dummy value
2865 if(ntracks == kMaxTracksStack) return ntracks;
2871 // Update Seeds and calculate Likelihood
2872 // fit tracklets and cook likelihood
2873 Double_t chi2Vals[4];
2874 chi2Vals[0] = FitTiltedRieman(&cseed[0], kTRUE);
2875 for(int iLayer=0; iLayer<kNSeedPlanes; iLayer++){
2876 Int_t jLayer = planes[iLayer];
2877 cseed[jLayer].Fit(1);
2879 Double_t like = CookLikelihood(&cseed[0], planes); // to be checked
2881 if (TMath::Log(1.E-9 + like) < fkRecoParam->GetTrackLikelihood()){
2882 AliDebug(3, Form("Filter on likelihood %f[%e].", TMath::Log(1.E-9 + like), like));
2883 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2886 //AliInfo(Form("Passed likelihood %f[%e].", TMath::Log(1.E-9 + like), like));
2888 // book preliminry results
2889 //seedQuality[ntracks] = like;
2890 fSeedLayer[ntracks] = config;/*sLayer;*/
2892 // attach clusters to the extrapolation seeds
2894 for(int iLayer=0; iLayer<kNPlanes-kNSeedPlanes; iLayer++){
2895 Int_t jLayer = planesExt[iLayer];
2896 if(!(chamber = stack[jLayer])) continue;
2898 // fit extrapolated seed
2899 if ((jLayer == 0) && !(cseed[1].IsOK())) continue;
2900 if ((jLayer == 5) && !(cseed[4].IsOK())) continue;
2901 AliTRDseedV1 pseed = cseed[jLayer];
2902 if(!pseed.AttachClusters(chamber, kTRUE)) continue;
2904 cseed[jLayer] = pseed;
2905 chi2Vals[0] = FitTiltedRieman(cseed, kTRUE);
2906 cseed[jLayer].Fit(1);
2910 // AliInfo("Extrapolation done.");
2911 // Debug Stream containing all the 6 tracklets
2912 if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) >= 2 && fkReconstructor->IsDebugStreaming()){
2913 TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
2914 TLinearFitter *tiltedRieman = GetTiltedRiemanFitter();
2915 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2916 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2917 cstreamer << "MakeSeeds1"
2918 << "EventNumber=" << eventNumber
2919 << "CandidateNumber=" << candidateNumber
2920 << "S0.=" << &cseed[0]
2921 << "S1.=" << &cseed[1]
2922 << "S2.=" << &cseed[2]
2923 << "S3.=" << &cseed[3]
2924 << "S4.=" << &cseed[4]
2925 << "S5.=" << &cseed[5]
2926 << "FitterT.=" << tiltedRieman
2930 if(fkRecoParam->HasImproveTracklets()){
2931 if(!ImproveSeedQuality(stack, cseed, chi2Vals[0])){
2932 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2933 AliDebug(3, "ImproveSeedQuality() failed.");
2937 // do track fitting with vertex constraint
2938 if(fkRecoParam->IsVertexConstrained()) chi2Vals[1] = FitTiltedRiemanConstraint(&cseed[0], GetZ());
2939 else chi2Vals[1] = -1.;
2940 chi2Vals[2] = GetChi2Z(&cseed[0]);
2941 chi2Vals[3] = GetChi2Phi(&cseed[0]);
2943 // calculate track quality
2944 fTrackQuality[ntracks] = CalculateTrackLikelihood(&chi2Vals[0]);
2946 if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) >= 2 && fkReconstructor->IsDebugStreaming()){
2947 TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
2948 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2949 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2950 TLinearFitter *fitterTC = GetTiltedRiemanFitterConstraint();
2951 TLinearFitter *fitterT = GetTiltedRiemanFitter();
2953 for(Int_t iseed = 0; iseed < kNPlanes; iseed++){
2954 ncls += cseed[iseed].IsOK() ? cseed[iseed].GetN2() : 0;
2956 cstreamer << "MakeSeeds2"
2957 << "EventNumber=" << eventNumber
2958 << "CandidateNumber=" << candidateNumber
2959 << "Chi2TR=" << chi2Vals[0]
2960 << "Chi2TC=" << chi2Vals[1]
2961 << "Nlayers=" << mlayers
2962 << "NClusters=" << ncls
2964 << "S0.=" << &cseed[0]
2965 << "S1.=" << &cseed[1]
2966 << "S2.=" << &cseed[2]
2967 << "S3.=" << &cseed[3]
2968 << "S4.=" << &cseed[4]
2969 << "S5.=" << &cseed[5]
2970 << "FitterT.=" << fitterT
2971 << "FitterTC.=" << fitterTC
2974 if(AliLog::GetDebugLevel("TRD", "AliTRDtrackerV1")){
2975 Double_t pt[]={0., 0.};
2976 for(Int_t il(0); il<kNPlanes; il++){
2977 if(!cseed[il].IsOK()) continue;
2978 pt[0] = GetBz()*kB2C/cseed[il].GetC();
2979 pt[1] = GetBz()*kB2C/cseed[il].GetC(1);
2982 AliDebug(2, Form("Candidate[%2d] pt[%7.3f %7.3f] Q[%e]\n"
2983 " [0] x[%6.2f] n[%2d] nu[%d] OK[%c]\n"
2984 " [1] x[%6.2f] n[%2d] nu[%d] OK[%c]\n"
2985 " [2] x[%6.2f] n[%2d] nu[%d] OK[%c]\n"
2986 " [3] x[%6.2f] n[%2d] nu[%d] OK[%c]\n"
2987 " [4] x[%6.2f] n[%2d] nu[%d] OK[%c]\n"
2988 " [5] x[%6.2f] n[%2d] nu[%d] OK[%c]"
2989 , ntracks, pt[0], pt[1], fTrackQuality[ntracks]
2990 ,cseed[0].GetX(), cseed[0].GetN(), cseed[0].GetNUsed(), cseed[0].IsOK()?'y':'n'
2991 ,cseed[1].GetX(), cseed[1].GetN(), cseed[1].GetNUsed(), cseed[1].IsOK()?'y':'n'
2992 ,cseed[2].GetX(), cseed[2].GetN(), cseed[2].GetNUsed(), cseed[2].IsOK()?'y':'n'
2993 ,cseed[3].GetX(), cseed[3].GetN(), cseed[3].GetNUsed(), cseed[3].IsOK()?'y':'n'
2994 ,cseed[4].GetX(), cseed[4].GetN(), cseed[4].GetNUsed(), cseed[4].IsOK()?'y':'n'
2995 ,cseed[5].GetX(), cseed[5].GetN(), cseed[5].GetNUsed(), cseed[5].IsOK()?'y':'n'));
2998 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2999 if(ntracks == kMaxTracksStack){
3000 AliWarning(Form("Number of seeds reached maximum allowed (%d) in stack.", kMaxTracksStack));
3011 //_____________________________________________________________________________
3012 AliTRDtrackV1* AliTRDtrackerV1::MakeTrack(AliTRDseedV1 * const tracklet)
3015 // Build a TRD track out of tracklet candidates
3018 // seeds : array of tracklets
3019 // params : array of track parameters as they are estimated by stand alone tracker. 7 elements.
3020 // [0] - radial position of the track at reference point
3021 // [1] - y position of the fit at [0]
3022 // [2] - z position of the fit at [0]
3023 // [3] - snp of the first tracklet
3024 // [4] - tgl of the first tracklet
3025 // [5] - curvature of the Riemann fit - 1/pt
3026 // [6] - sector rotation angle
3031 // Initialize the TRD track based on the parameters of the fit and a parametric covariance matrix
3032 // (diagonal with constant variance terms TODO - correct parameterization)
3034 // In case of HLT just register the tracklets in the tracker and return values of the Riemann fit. For the
3035 // offline case perform a full Kalman filter on the already found tracklets (see AliTRDtrackerV1::FollowBackProlongation()
3036 // for details). Do also MC label calculation and PID if propagation successfully.
3038 if(fkReconstructor->IsHLT()) FitTiltedRiemanConstraint(tracklet, 0);
3039 Double_t alpha = AliTRDgeometry::GetAlpha();
3040 Double_t shift = AliTRDgeometry::GetAlpha()/2.0;
3042 // find first good tracklet
3043 Int_t idx(0); while(idx<kNPlanes && !tracklet[idx].IsOK()) idx++;
3044 if(idx>2){ AliDebug(1, Form("Found suspect track start @ layer idx[%d]\n"
3045 " %c[0] x0[%f] n[%d] nu[%d] OK[%c]\n"
3046 " %c[1] x0[%f] n[%d] nu[%d] OK[%c]\n"
3047 " %c[2] x0[%f] n[%d] nu[%d] OK[%c]\n"
3048 " %c[3] x0[%f] n[%d] nu[%d] OK[%c]\n"
3049 " %c[4] x0[%f] n[%d] nu[%d] OK[%c]\n"
3050 " %c[5] x0[%f] n[%d] nu[%d] OK[%c]"
3052 ,idx==0?'*':' ', tracklet[0].GetX0(), tracklet[0].GetN(), tracklet[0].GetNUsed(), tracklet[0].IsOK()?'y':'n'
3053 ,idx==1?'*':' ', tracklet[1].GetX0(), tracklet[1].GetN(), tracklet[1].GetNUsed(), tracklet[1].IsOK()?'y':'n'
3054 ,idx==2?'*':' ', tracklet[2].GetX0(), tracklet[2].GetN(), tracklet[2].GetNUsed(), tracklet[2].IsOK()?'y':'n'
3055 ,idx==3?'*':' ', tracklet[3].GetX0(), tracklet[3].GetN(), tracklet[3].GetNUsed(), tracklet[3].IsOK()?'y':'n'
3056 ,idx==4?'*':' ', tracklet[4].GetX0(), tracklet[4].GetN(), tracklet[4].GetNUsed(), tracklet[4].IsOK()?'y':'n'
3057 ,idx==5?'*':' ', tracklet[5].GetX0(), tracklet[5].GetN(), tracklet[5].GetNUsed(), tracklet[5].IsOK()?'y':'n'));
3062 Double_t x(tracklet[idx].GetX0() - dx);
3063 // Build track parameters
3064 Double_t params[] = {
3065 tracklet[idx].GetYref(0) - dx*tracklet[idx].GetYref(1) // y
3066 ,tracklet[idx].GetZref(0) - dx*tracklet[idx].GetZref(1) // z
3067 ,TMath::Sin(TMath::ATan(tracklet[idx].GetYref(1))) // snp
3068 ,tracklet[idx].GetZref(1) / TMath::Sqrt(1. + tracklet[idx].GetYref(1) * tracklet[idx].GetYref(1)) // tgl
3069 ,tracklet[idx].GetC(fkReconstructor->IsHLT()?1:0) // curvature -> 1/pt
3071 Int_t sector(fGeom->GetSector(tracklet[idx].GetDetector()));
3074 c[ 0] = 0.2; // s^2_y
3075 c[ 1] = 0.0; c[ 2] = 2.0; // s^2_z
3076 c[ 3] = 0.0; c[ 4] = 0.0; c[ 5] = 0.02; // s^2_snp
3077 c[ 6] = 0.0; c[ 7] = 0.0; c[ 8] = 0.0; c[ 9] = 0.1; // s^2_tgl
3078 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
3080 AliTRDtrackV1 track(tracklet, params, c, x, sector*alpha+shift);
3082 AliTRDseedV1 *ptrTracklet = NULL;
3084 // skip Kalman filter for HLT
3085 if(/*fkReconstructor->IsHLT()*/kFALSE){
3086 for (Int_t jLayer = 0; jLayer < AliTRDgeometry::kNlayer; jLayer++) {
3087 track.UnsetTracklet(jLayer);
3088 ptrTracklet = &tracklet[jLayer];
3089 if(!ptrTracklet->IsOK()) continue;
3090 if(TMath::Abs(ptrTracklet->GetYref(1) - ptrTracklet->GetYfit(1)) >= .2) continue; // check this condition with Marian
3091 ptrTracklet = SetTracklet(ptrTracklet);
3092 ptrTracklet->UseClusters();
3093 track.SetTracklet(ptrTracklet, fTracklets->GetEntriesFast()-1);
3095 AliTRDtrackV1 *ptrTrack = SetTrack(&track);
3096 ptrTrack->CookPID();
3097 ptrTrack->CookLabel(.9);
3098 ptrTrack->SetReconstructor(fkReconstructor);
3102 // prevent the error message in AliTracker::MeanMaterialBudget: "start point out of geometry"
3103 if(TMath::Abs(track.GetX()) + TMath::Abs(track.GetY()) + TMath::Abs(track.GetZ()) > 10000) return NULL;
3105 track.ResetCovariance(1);
3106 Int_t nc = TMath::Abs(FollowBackProlongation(track));
3107 if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 5 && fkReconstructor->IsDebugStreaming()){
3108 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
3109 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
3110 Double_t p[5]; // Track Params for the Debug Stream
3111 track.GetExternalParameters(x, p);
3112 TTreeSRedirector &cs = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
3114 << "EventNumber=" << eventNumber
3115 << "CandidateNumber=" << candidateNumber
3123 << "Yin=" << params[0]
3124 << "Zin=" << params[1]
3125 << "snpin=" << params[2]
3126 << "tndin=" << params[3]
3127 << "crvin=" << params[4]
3128 << "track.=" << &track
3132 UnsetTrackletsTrack(&track);
3135 AliTRDtrackV1 *ptrTrack = SetTrack(&track);
3136 ptrTrack->SetReconstructor(fkReconstructor);
3137 ptrTrack->CookLabel(.9);
3138 for(Int_t il(kNPlanes); il--;){
3139 if(!(ptrTracklet = ptrTrack->GetTracklet(il))) continue;
3140 ptrTracklet->UseClusters();
3143 // computes PID for track
3144 ptrTrack->CookPID();
3145 // update calibration references using this track
3146 AliTRDCalibraFillHisto *calibra = AliTRDCalibraFillHisto::Instance();
3148 AliInfo("Could not get Calibra instance.");
3149 } else if(calibra->GetHisto2d()){
3150 calibra->UpdateHistogramsV1(ptrTrack);
3156 //____________________________________________________________________
3157 Bool_t AliTRDtrackerV1::ImproveSeedQuality(AliTRDtrackingChamber **stack, AliTRDseedV1 *cseed, Double_t &chi2)
3160 // Sort tracklets according to "quality" and try to "improve" the first 4 worst
3163 // layers : Array of propagation layers for a stack/supermodule
3164 // cseed : Array of 6 seeding tracklets which has to be improved
3167 // cssed : Improved seeds
3169 // Detailed description
3171 // Iterative procedure in which new clusters are searched for each
3172 // tracklet seed such that the seed quality (see AliTRDseed::GetQuality())
3173 // can be maximized. If some optimization is found the old seeds are replaced.
3178 // make a local working copy
3179 AliTRDtrackingChamber *chamber = NULL;
3180 AliTRDseedV1 bseed[AliTRDgeometry::kNlayer];
3182 Float_t quality(1.e3),
3183 lQuality[AliTRDgeometry::kNlayer] = {1.e3, 1.e3, 1.e3, 1.e3, 1.e3, 1.e3};
3185 for(Int_t jLayer=AliTRDgeometry::kNlayer; jLayer--;){
3186 bseed[jLayer] = cseed[jLayer];
3187 if(!bseed[jLayer].IsOK()) continue;
3189 lQuality[jLayer] = bseed[jLayer].GetQuality(kTRUE);
3190 quality += lQuality[jLayer];
3195 AliDebug(2, Form("Start N[%d] Q[%f] chi2[%f]", rLayers, quality, chi2));
3197 for (Int_t iter = 0; iter < 4; iter++) {
3198 // Try better cluster set
3199 Int_t nLayers(0); Float_t qualitynew(0.);
3200 Int_t indexes[4*AliTRDgeometry::kNlayer];
3201 TMath::Sort(Int_t(AliTRDgeometry::kNlayer), lQuality, indexes, kFALSE);
3202 for(Int_t jLayer=AliTRDgeometry::kNlayer; jLayer--;) {
3203 Int_t bLayer = indexes[jLayer];
3204 bseed[bLayer].Reset("c");
3205 if(!(chamber = stack[bLayer])) continue;
3206 if(!bseed[bLayer].AttachClusters(chamber, kTRUE)) continue;
3207 bseed[bLayer].Fit(1);
3208 if(!bseed[bLayer].IsOK()) continue;
3210 lQuality[jLayer] = bseed[jLayer].GetQuality(kTRUE);
3211 qualitynew += lQuality[jLayer];
3213 if(rLayers > nLayers){
3214 AliDebug(1, Form("Lost %d tracklets while improving.", rLayers-nLayers));
3215 return iter>0?kTRUE:kFALSE;
3216 } else rLayers=nLayers;
3217 qualitynew /= rLayers;
3219 if(qualitynew > quality){
3220 AliDebug(4, Form("Quality[%f] worsen in iter[%d] to ref[%f].", qualitynew, iter, quality));
3221 return iter>0?kTRUE:kFALSE;
3222 } else quality = qualitynew;
3224 // try improve track parameters
3225 Float_t chi2new = FitTiltedRieman(bseed, kTRUE);
3227 AliDebug(4, Form("Chi2[%f] worsen in iter[%d] to ref[%f].", chi2new, iter, chi2));
3228 return iter>0?kTRUE:kFALSE;
3229 } else chi2 = chi2new;
3231 // store better tracklets
3232 for(Int_t jLayer=AliTRDgeometry::kNlayer; jLayer--;) cseed[jLayer]=bseed[jLayer];
3233 AliDebug(2, Form("Iter[%d] Q[%f] chi2[%f]", iter, quality, chi2));
3236 if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) >= 7 && fkReconstructor->IsDebugStreaming()){
3237 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
3238 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
3239 TLinearFitter *tiltedRieman = GetTiltedRiemanFitter();
3240 TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
3241 cstreamer << "ImproveSeedQuality"
3242 << "EventNumber=" << eventNumber
3243 << "CandidateNumber=" << candidateNumber
3244 << "Iteration=" << iter
3245 << "S0.=" << &cseed[0]
3246 << "S1.=" << &cseed[1]
3247 << "S2.=" << &cseed[2]
3248 << "S3.=" << &cseed[3]
3249 << "S4.=" << &cseed[4]
3250 << "S5.=" << &cseed[5]
3251 << "FitterT.=" << tiltedRieman
3256 // we are sure that at least 4 tracklets are OK !
3260 //_________________________________________________________________________
3261 Double_t AliTRDtrackerV1::CalculateTrackLikelihood(Double_t *chi2){
3263 // Calculates the Track Likelihood value. This parameter serves as main quality criterion for
3264 // the track selection
3265 // The likelihood value containes:
3266 // - The chi2 values from the both fitters and the chi2 values in z-direction from a linear fit
3267 // - The Sum of the Parameter |slope_ref - slope_fit|/Sigma of the tracklets
3268 // For all Parameters an exponential dependency is used
3270 // Parameters: - Array of tracklets (AliTRDseedV1) related to the track candidate
3271 // - Array of chi2 values:
3272 // * Non-Constrained Tilted Riemann fit
3273 // * Vertex-Constrained Tilted Riemann fit
3274 // * z-Direction from Linear fit
3275 // Output: - The calculated track likelihood
3280 // Non-constrained Tilted Riemann
3281 Double_t likeChi2TR = TMath::Exp(-chi2[0] * 0.0078);
3282 // Constrained Tilted Riemann
3283 Double_t likeChi2TC(1.);
3285 likeChi2TC = TMath::Exp(-chi2[1] * 0.677);
3286 Double_t r = likeChi2TC/likeChi2TR;
3287 if(r>1.e2){;} // -> a primary track use TC
3288 else if(r<1.e2) // -> a secondary track use TR
3290 else{;} // -> test not conclusive
3292 // Chi2 only on Z direction
3293 Double_t likeChi2Z = TMath::Exp(-chi2[2] * 0.14);
3294 // Chi2 angular resolution
3295 Double_t likeChi2Phi= TMath::Exp(-chi2[3] * 3.23);
3297 Double_t trackLikelihood = likeChi2Z * likeChi2TR * likeChi2TC * likeChi2Phi;
3299 AliDebug(2, Form("Likelihood [%e]\n"
3300 " Rieman : chi2[%f] likelihood[%6.2e]\n"
3301 " Vertex : chi2[%f] likelihood[%6.2e]\n"
3302 " Z : chi2[%f] likelihood[%6.2e]\n"
3303 " Phi : chi2[%f] likelihood[%6.2e]"
3305 , chi2[0], likeChi2TR
3306 , chi2[1], likeChi2TC
3307 , chi2[2], likeChi2Z
3308 , chi2[3], likeChi2Phi
3311 if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) >= 2 && fkReconstructor->IsDebugStreaming()){
3312 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
3313 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
3314 TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
3315 cstreamer << "CalculateTrackLikelihood0"
3316 << "EventNumber=" << eventNumber
3317 << "CandidateNumber=" << candidateNumber
3318 << "LikeChi2Z=" << likeChi2Z
3319 << "LikeChi2TR=" << likeChi2TR
3320 << "LikeChi2TC=" << likeChi2TC
3321 << "LikeChi2Phi=" << likeChi2Phi
3322 << "TrackLikelihood=" << trackLikelihood
3326 return trackLikelihood;
3329 //____________________________________________________________________
3330 Double_t AliTRDtrackerV1::CookLikelihood(AliTRDseedV1 *cseed, Int_t planes[4])
3333 // Calculate the probability of this track candidate.
3336 // cseeds : array of candidate tracklets
3337 // planes : array of seeding planes (see seeding configuration)
3338 // chi2 : chi2 values (on the Z and Y direction) from the rieman fit of the track.
3343 // Detailed description
3345 // The track quality is estimated based on the following 4 criteria:
3346 // 1. precision of the rieman fit on the Y direction (likea)
3347 // 2. chi2 on the Y direction (likechi2y)
3348 // 3. chi2 on the Z direction (likechi2z)
3349 // 4. number of attached clusters compared to a reference value
3350 // (see AliTRDrecoParam::fkFindable) (likeN)
3352 // The distributions for each type of probabilities are given below as of
3353 // (date). They have to be checked to assure consistency of estimation.
3356 // ratio of the total number of clusters/track which are expected to be found by the tracker.
3357 Double_t chi2y = GetChi2Y(&cseed[0]);
3358 Double_t chi2z = GetChi2Z(&cseed[0]);
3360 Float_t nclusters = 0.;
3361 Double_t sumda = 0.;
3362 for(UChar_t ilayer = 0; ilayer < 4; ilayer++){
3363 Int_t jlayer = planes[ilayer];
3364 nclusters += cseed[jlayer].GetN2();
3365 sumda += TMath::Abs(cseed[jlayer].GetYfit(1) - cseed[jlayer].GetYref(1));
3369 Double_t likea = TMath::Exp(-sumda * fkRecoParam->GetPhiSlope());
3370 Double_t likechi2y = 0.0000000001;
3371 if (fkReconstructor->IsCosmic() || chi2y < fkRecoParam->GetChi2YCut()) likechi2y += TMath::Exp(-TMath::Sqrt(chi2y) * fkRecoParam->GetChi2YSlope());
3372 Double_t likechi2z = TMath::Exp(-chi2z * fkRecoParam->GetChi2ZSlope());
3373 Double_t likeN = TMath::Exp(-(fkRecoParam->GetNMeanClusters() - nclusters) / fkRecoParam->GetNSigmaClusters());
3374 Double_t like = likea * likechi2y * likechi2z * likeN;
3376 if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) >= 2 && fkReconstructor->IsDebugStreaming()){
3377 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
3378 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
3379 Int_t nTracklets = 0; Float_t meanNcls = 0;
3380 for(Int_t iseed=0; iseed < kNPlanes; iseed++){
3381 if(!cseed[iseed].IsOK()) continue;
3383 meanNcls += cseed[iseed].GetN2();
3385 if(nTracklets) meanNcls /= nTracklets;
3386 // The Debug Stream contains the seed
3387 TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
3388 cstreamer << "CookLikelihood"
3389 << "EventNumber=" << eventNumber
3390 << "CandidateNumber=" << candidateNumber
3391 << "tracklet0.=" << &cseed[0]
3392 << "tracklet1.=" << &cseed[1]
3393 << "tracklet2.=" << &cseed[2]
3394 << "tracklet3.=" << &cseed[3]
3395 << "tracklet4.=" << &cseed[4]
3396 << "tracklet5.=" << &cseed[5]
3397 << "sumda=" << sumda
3398 << "chi2y=" << chi2y
3399 << "chi2z=" << chi2z
3400 << "likea=" << likea
3401 << "likechi2y=" << likechi2y
3402 << "likechi2z=" << likechi2z
3403 << "nclusters=" << nclusters
3404 << "likeN=" << likeN
3406 << "meanncls=" << meanNcls
3413 //____________________________________________________________________
3414 void AliTRDtrackerV1::GetSeedingConfig(Int_t iconfig, Int_t planes[4])
3417 // Map seeding configurations to detector planes.
3420 // iconfig : configuration index
3421 // planes : member planes of this configuration. On input empty.
3424 // planes : contains the planes which are defining the configuration
3426 // Detailed description
3428 // Here is the list of seeding planes configurations together with
3429 // their topological classification:
3447 // The topologic quality is modeled as follows:
3448 // 1. The general model is define by the equation:
3449 // p(conf) = exp(-conf/2)
3450 // 2. According to the topologic classification, configurations from the same
3451 // class are assigned the agerage value over the model values.
3452 // 3. Quality values are normalized.
3454 // The topologic quality distribution as function of configuration is given below:
3456 // <img src="gif/topologicQA.gif">
3461 case 0: // 5432 TQ 0
3467 case 1: // 4321 TQ 0
3473 case 2: // 3210 TQ 0
3479 case 3: // 5321 TQ 1
3485 case 4: // 4210 TQ 1
3491 case 5: // 5431 TQ 1
3497 case 6: // 4320 TQ 1
3503 case 7: // 5430 TQ 2
3509 case 8: // 5210 TQ 2
3515 case 9: // 5421 TQ 3
3521 case 10: // 4310 TQ 3
3527 case 11: // 5410 TQ 4
3533 case 12: // 5420 TQ 5
3539 case 13: // 5320 TQ 5
3545 case 14: // 5310 TQ 5
3554 //____________________________________________________________________
3555 void AliTRDtrackerV1::GetExtrapolationConfig(Int_t iconfig, Int_t planes[2])
3558 // Returns the extrapolation planes for a seeding configuration.
3561 // iconfig : configuration index
3562 // planes : planes which are not in this configuration. On input empty.
3565 // planes : contains the planes which are not in the configuration
3567 // Detailed description
3571 case 0: // 5432 TQ 0
3575 case 1: // 4321 TQ 0
3579 case 2: // 3210 TQ 0
3583 case 3: // 5321 TQ 1
3587 case 4: // 4210 TQ 1
3591 case 5: // 5431 TQ 1
3595 case 6: // 4320 TQ 1
3599 case 7: // 5430 TQ 2
3603 case 8: // 5210 TQ 2
3607 case 9: // 5421 TQ 3
3611 case 10: // 4310 TQ 3
3615 case 11: // 5410 TQ 4
3619 case 12: // 5420 TQ 5
3623 case 13: // 5320 TQ 5
3627 case 14: // 5310 TQ 5
3634 //____________________________________________________________________
3635 AliCluster* AliTRDtrackerV1::GetCluster(Int_t idx) const
3637 if(!fClusters) return NULL;
3638 Int_t ncls = fClusters->GetEntriesFast();
3639 return idx >= 0 && idx < ncls ? (AliCluster*)fClusters->UncheckedAt(idx) : NULL;
3642 //____________________________________________________________________
3643 AliTRDseedV1* AliTRDtrackerV1::GetTracklet(Int_t idx) const
3645 if(!fTracklets) return NULL;
3646 Int_t ntrklt = fTracklets->GetEntriesFast();
3647 return idx >= 0 && idx < ntrklt ? (AliTRDseedV1*)fTracklets->UncheckedAt(idx) : NULL;
3650 //____________________________________________________________________
3651 AliKalmanTrack* AliTRDtrackerV1::GetTrack(Int_t idx) const
3653 if(!fTracks) return NULL;
3654 Int_t ntrk = fTracks->GetEntriesFast();
3655 return idx >= 0 && idx < ntrk ? (AliKalmanTrack*)fTracks->UncheckedAt(idx) : NULL;
3660 // //_____________________________________________________________________________
3661 // Int_t AliTRDtrackerV1::Freq(Int_t n, const Int_t *inlist
3662 // , Int_t *outlist, Bool_t down)
3665 // // Sort eleements according occurancy
3666 // // The size of output array has is 2*n
3673 // Int_t *sindexS = new Int_t[n]; // Temporary array for sorting
3674 // Int_t *sindexF = new Int_t[2*n];
3675 // for (Int_t i = 0; i < n; i++) {
3679 // TMath::Sort(n,inlist,sindexS,down);
3681 // Int_t last = inlist[sindexS[0]];
3682 // Int_t val = last;
3684 // sindexF[0+n] = last;
3685 // Int_t countPos = 0;
3687 // // Find frequency
3688 // for (Int_t i = 1; i < n; i++) {
3689 // val = inlist[sindexS[i]];
3690 // if (last == val) {
3691 // sindexF[countPos]++;
3695 // sindexF[countPos+n] = val;
3696 // sindexF[countPos]++;
3700 // if (last == val) {
3704 // // Sort according frequency
3705 // TMath::Sort(countPos,sindexF,sindexS,kTRUE);
3707 // for (Int_t i = 0; i < countPos; i++) {
3708 // outlist[2*i ] = sindexF[sindexS[i]+n];
3709 // outlist[2*i+1] = sindexF[sindexS[i]];
3712 // delete [] sindexS;
3713 // delete [] sindexF;
3720 //____________________________________________________________________
3721 void AliTRDtrackerV1::ResetSeedTB()
3723 // reset buffer for seeding time bin layers. If the time bin
3724 // layers are not allocated this function allocates them
3726 for(Int_t isl=0; isl<kNSeedPlanes; isl++){
3727 if(!fSeedTB[isl]) fSeedTB[isl] = new AliTRDchamberTimeBin();
3728 else fSeedTB[isl]->Clear();
3733 //_____________________________________________________________________________
3734 Float_t AliTRDtrackerV1::GetChi2Y(const AliTRDseedV1 * const tracklets) const
3736 // Calculates normalized chi2 in y-direction
3737 // chi2 = Sum chi2 / n_tracklets
3739 Double_t chi2 = 0.; Int_t n = 0;
3740 for(Int_t ipl = kNPlanes; ipl--;){
3741 if(!tracklets[ipl].IsOK()) continue;
3742 chi2 += tracklets[ipl].GetChi2Y();
3745 return n ? chi2/n : 0.;
3748 //_____________________________________________________________________________
3749 Float_t AliTRDtrackerV1::GetChi2Z(const AliTRDseedV1 *const tracklets) const
3751 // Calculates normalized chi2 in z-direction
3752 // chi2 = Sum chi2 / n_tracklets
3754 Double_t chi2 = 0; Int_t n = 0;
3755 for(Int_t ipl = kNPlanes; ipl--;){
3756 if(!tracklets[ipl].IsOK()) continue;
3757 chi2 += tracklets[ipl].GetChi2Z();
3760 return n ? chi2/n : 0.;
3763 //_____________________________________________________________________________
3764 Float_t AliTRDtrackerV1::GetChi2Phi(const AliTRDseedV1 *const tracklets) const
3766 // Calculates normalized chi2 for angular resolution
3767 // chi2 = Sum chi2 / n_tracklets
3769 Double_t chi2 = 0; Int_t n = 0;
3770 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
3771 if(!tracklets[iLayer].IsOK()) continue;
3772 chi2 += tracklets[iLayer].GetChi2Phi();
3775 return n ? chi2/n: 0.;
3778 //____________________________________________________________________
3779 Float_t AliTRDtrackerV1::CalculateReferenceX(const AliTRDseedV1 *const tracklets){
3781 // Calculates the reference x-position for the tilted Rieman fit defined as middle
3782 // of the stack (middle between layers 2 and 3). For the calculation all the tracklets
3783 // are taken into account
3785 // Parameters: - Array of tracklets(AliTRDseedV1)
3787 // Output: - The reference x-position(Float_t)
3788 // Only kept for compatibility with the old code
3790 Int_t nDistances = 0;
3791 Float_t meanDistance = 0.;
3792 Int_t startIndex = 5;
3793 for(Int_t il =5; il > 0; il--){
3794 if(tracklets[il].IsOK() && tracklets[il -1].IsOK()){
3795 Float_t xdiff = tracklets[il].GetX0() - tracklets[il -1].GetX0();
3796 meanDistance += xdiff;
3799 if(tracklets[il].IsOK()) startIndex = il;
3801 if(tracklets[0].IsOK()) startIndex = 0;
3803 // We should normally never get here
3804 Float_t xpos[2]; memset(xpos, 0, sizeof(Float_t) * 2);
3805 Int_t iok = 0, idiff = 0;
3806 // This attempt is worse and should be avoided:
3807 // check for two chambers which are OK and repeat this without taking the mean value
3808 // Strategy avoids a division by 0;
3809 for(Int_t il = 5; il >= 0; il--){
3810 if(tracklets[il].IsOK()){
3811 xpos[iok] = tracklets[il].GetX0();
3815 if(iok) idiff++; // to get the right difference;
3819 meanDistance = (xpos[0] - xpos[1])/idiff;
3822 // we have do not even have 2 layers which are OK? The we do not need to fit at all
3827 meanDistance /= nDistances;
3829 return tracklets[startIndex].GetX0() + (2.5 - startIndex) * meanDistance - 0.5 * (AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick());
3832 //_____________________________________________________________________________
3833 Double_t AliTRDtrackerV1::FitTiltedRiemanV1(AliTRDseedV1 *const tracklets){
3835 // Track Fitter Function using the new class implementation of
3838 AliTRDtrackFitterRieman fitter;
3839 fitter.SetRiemanFitter(GetTiltedRiemanFitter());
3841 for(Int_t il = 0; il < AliTRDgeometry::kNlayer; il++) fitter.SetTracklet(il, &tracklets[il]);
3842 Double_t chi2 = fitter.Eval();
3843 // Update the tracklets
3844 Double_t cov[15]; Double_t x0;
3845 memset(cov, 0, sizeof(Double_t) * 15);
3846 for(Int_t il = 0; il < AliTRDgeometry::kNlayer; il++){
3847 x0 = tracklets[il].GetX0();
3848 tracklets[il].SetYref(0, fitter.GetYat(x0));
3849 tracklets[il].SetZref(0, fitter.GetZat(x0));
3850 tracklets[il].SetYref(1, fitter.GetDyDxAt(x0));
3851 tracklets[il].SetZref(1, fitter.GetDzDx());
3852 tracklets[il].SetC(fitter.GetCurvature());
3853 fitter.GetCovAt(x0, cov);
3854 tracklets[il].SetCovRef(cov);
3855 tracklets[il].SetChi2(chi2);
3860 //____________________________________________________________________
3861 void AliTRDtrackerV1::UnsetTrackletsTrack(const AliTRDtrackV1 * const track)
3863 // Remove tracklets from tracker list attached to "track"
3865 for(Int_t il(0); il<kNPlanes; il++){
3866 if((idx = track->GetTrackletIndex(il)) < 0) continue;
3867 delete (fTracklets->RemoveAt(idx));
3872 ///////////////////////////////////////////////////////
3874 // Resources of class AliTRDLeastSquare //
3876 ///////////////////////////////////////////////////////
3878 //_____________________________________________________________________________
3879 AliTRDtrackerV1::AliTRDLeastSquare::AliTRDLeastSquare(){
3881 // Constructor of the nested class AliTRDtrackFitterLeastSquare
3883 // Fast solving linear regresion in 2D
3885 // The data members have the following meaning
3896 // fCovarianceMatrix[0] : s2a
3897 // fCovarianceMatrix[1] : s2b
3898 // fCovarianceMatrix[2] : cov(ab)
3900 memset(fParams, 0, sizeof(Double_t) * 2);
3901 memset(fSums, 0, sizeof(Double_t) * 6);
3902 memset(fCovarianceMatrix, 0, sizeof(Double_t) * 3);
3906 //_____________________________________________________________________________
3907 void AliTRDtrackerV1::AliTRDLeastSquare::AddPoint(const Double_t *const x, Double_t y, Double_t sigmaY){
3909 // Adding Point to the fitter
3912 Double_t weight = 1/(sigmaY > 1e-9 ? sigmaY : 1e-9);
3914 const Double_t &xpt = *x;
3915 // printf("Adding point x = %f, y = %f, sigma = %f\n", xpt, y, sigmaY);
3917 fSums[1] += weight * xpt;
3918 fSums[2] += weight * y;
3919 fSums[3] += weight * xpt * y;
3920 fSums[4] += weight * xpt * xpt;
3921 fSums[5] += weight * y * y;
3924 //_____________________________________________________________________________
3925 void AliTRDtrackerV1::AliTRDLeastSquare::RemovePoint(const Double_t *const x, Double_t y, Double_t sigmaY){
3927 // Remove Point from the sample
3930 Double_t weight = 1/(sigmaY > 1e-9 ? sigmaY : 1e-9);
3932 const Double_t &xpt = *x;
3934 fSums[1] -= weight * xpt;
3935 fSums[2] -= weight * y;
3936 fSums[3] -= weight * xpt * y;
3937 fSums[4] -= weight * xpt * xpt;
3938 fSums[5] -= weight * y * y;
3941 //_____________________________________________________________________________
3942 Bool_t AliTRDtrackerV1::AliTRDLeastSquare::Eval(){
3944 // Evaluation of the fit:
3945 // Calculation of the parameters
3946 // Calculation of the covariance matrix
3949 Double_t det = fSums[0] * fSums[4] - fSums[1] *fSums[1];
3950 if(TMath::Abs(det)<1.e-30) return kFALSE;
3952 // for(Int_t isum = 0; isum < 5; isum++)
3953 // printf("fSums[%d] = %f\n", isum, fSums[isum]);
3954 // printf("denominator = %f\n", denominator);
3955 fParams[0] = (fSums[2] * fSums[4] - fSums[1] * fSums[3])/det;
3956 fParams[1] = (fSums[0] * fSums[3] - fSums[1] * fSums[2])/det;
3957 // printf("fParams[0] = %f, fParams[1] = %f\n", fParams[0], fParams[1]);
3959 // Covariance matrix
3960 Double_t den = fSums[0]*fSums[4] - fSums[1]*fSums[1];
3961 fCovarianceMatrix[0] = fSums[4] / den;
3962 fCovarianceMatrix[1] = fSums[0] / den;
3963 fCovarianceMatrix[2] = -fSums[1] / den;
3964 /* fCovarianceMatrix[0] = fSums[4] / fSums[0] - fSums[1] * fSums[1] / (fSums[0] * fSums[0]);
3965 fCovarianceMatrix[1] = fSums[5] / fSums[0] - fSums[2] * fSums[2] / (fSums[0] * fSums[0]);
3966 fCovarianceMatrix[2] = fSums[3] / fSums[0] - fSums[1] * fSums[2] / (fSums[0] * fSums[0]);*/
3973 //_____________________________________________________________________________
3974 Double_t AliTRDtrackerV1::AliTRDLeastSquare::GetFunctionValue(const Double_t *const xpos) const {
3976 // Returns the Function value of the fitted function at a given x-position
3978 return fParams[0] + fParams[1] * (*xpos);
3981 //_____________________________________________________________________________
3982 void AliTRDtrackerV1::AliTRDLeastSquare::GetCovarianceMatrix(Double_t *storage) const {
3984 // Copies the values of the covariance matrix into the storage
3986 memcpy(storage, fCovarianceMatrix, sizeof(Double_t) * 3);
3989 //_____________________________________________________________________________
3990 void AliTRDtrackerV1::AliTRDLeastSquare::Reset(){
3994 memset(fParams, 0, sizeof(Double_t) * 2);
3995 memset(fCovarianceMatrix, 0, sizeof(Double_t) * 3);
3996 memset(fSums, 0, sizeof(Double_t) * 6);
3999 ///////////////////////////////////////////////////////
4001 // Resources of class AliTRDtrackFitterRieman //
4003 ///////////////////////////////////////////////////////
4005 //_____________________________________________________________________________
4006 AliTRDtrackerV1::AliTRDtrackFitterRieman::AliTRDtrackFitterRieman():
4012 fSysClusterError(0.)
4015 // Default constructor
4017 fZfitter = new AliTRDLeastSquare;
4018 fCovarPolY = new TMatrixD(3,3);
4019 fCovarPolZ = new TMatrixD(2,2);
4020 memset(fTracklets, 0, sizeof(AliTRDseedV1 *) * 6);
4021 memset(fParameters, 0, sizeof(Double_t) * 5);
4022 memset(fSumPolY, 0, sizeof(Double_t) * 5);
4023 memset(fSumPolZ, 0, sizeof(Double_t) * 2);
4026 //_____________________________________________________________________________
4027 AliTRDtrackerV1::AliTRDtrackFitterRieman::~AliTRDtrackFitterRieman(){
4031 if(fZfitter) delete fZfitter;
4032 if(fCovarPolY) delete fCovarPolY;
4033 if(fCovarPolZ) delete fCovarPolZ;
4036 //_____________________________________________________________________________
4037 void AliTRDtrackerV1::AliTRDtrackFitterRieman::Reset(){
4042 fTrackFitter->StoreData(kTRUE);
4043 fTrackFitter->ClearPoints();
4049 memset(fTracklets, 0, sizeof(AliTRDseedV1 *) * AliTRDgeometry::kNlayer);
4050 memset(fParameters, 0, sizeof(Double_t) * 5);
4051 memset(fSumPolY, 0, sizeof(Double_t) * 5);
4052 memset(fSumPolZ, 0, sizeof(Double_t) * 2);
4053 for(Int_t irow = 0; irow < fCovarPolY->GetNrows(); irow++)
4054 for(Int_t icol = 0; icol < fCovarPolY->GetNcols(); icol++){
4055 (*fCovarPolY)(irow, icol) = 0.;
4056 if(irow < 2 && icol < 2)
4057 (*fCovarPolZ)(irow, icol) = 0.;
4061 //_____________________________________________________________________________
4062 void AliTRDtrackerV1::AliTRDtrackFitterRieman::SetTracklet(Int_t itr, AliTRDseedV1 *tracklet){
4064 // Add tracklet into the fitter
4066 if(itr >= AliTRDgeometry::kNlayer) return;
4067 fTracklets[itr] = tracklet;
4070 //_____________________________________________________________________________
4071 Double_t AliTRDtrackerV1::AliTRDtrackFitterRieman::Eval(){
4074 // 1. Apply linear transformation and store points in the fitter
4075 // 2. Evaluate the fit
4076 // 3. Check if the result of the fit in z-direction is reasonable
4078 // 3a. Fix the parameters 3 and 4 with the results of a simple least
4080 // 3b. Redo the fit with the fixed parameters
4081 // 4. Store fit results (parameters and errors)
4086 fXref = CalculateReferenceX();
4087 for(Int_t il = 0; il < AliTRDgeometry::kNlayer; il++) UpdateFitters(fTracklets[il]);
4088 if(!fTrackFitter->GetNpoints()) return 1e10;
4090 fTrackFitter->Eval();
4092 fParameters[3] = fTrackFitter->GetParameter(3);
4093 fParameters[4] = fTrackFitter->GetParameter(4);
4094 if(!CheckAcceptable(fParameters[3], fParameters[4])) {
4095 fTrackFitter->FixParameter(3, fZfitter->GetFunctionValue(&fXref));
4096 fTrackFitter->FixParameter(4, fZfitter->GetFunctionParameter(1));
4097 fTrackFitter->Eval();
4098 fTrackFitter->ReleaseParameter(3);
4099 fTrackFitter->ReleaseParameter(4);
4100 fParameters[3] = fTrackFitter->GetParameter(3);
4101 fParameters[4] = fTrackFitter->GetParameter(4);
4103 // Update the Fit Parameters and the errors
4104 fParameters[0] = fTrackFitter->GetParameter(0);
4105 fParameters[1] = fTrackFitter->GetParameter(1);
4106 fParameters[2] = fTrackFitter->GetParameter(2);
4108 // Prepare Covariance estimation
4109 (*fCovarPolY)(0,0) = fSumPolY[0]; (*fCovarPolY)(1,1) = fSumPolY[2]; (*fCovarPolY)(2,2) = fSumPolY[4];
4110 (*fCovarPolY)(1,0) = (*fCovarPolY)(0,1) = fSumPolY[1];
4111 (*fCovarPolY)(2,0) = (*fCovarPolY)(0,2) = fSumPolY[2];
4112 (*fCovarPolY)(2,1) = (*fCovarPolY)(1,2) = fSumPolY[3];
4113 fCovarPolY->Invert();
4114 (*fCovarPolZ)(0,0) = fSumPolZ[0]; (*fCovarPolZ)(1,1) = fSumPolZ[2];
4115 (*fCovarPolZ)(1,0) = (*fCovarPolZ)(0,1) = fSumPolZ[1];
4116 fCovarPolZ->Invert();
4117 return fTrackFitter->GetChisquare() / fTrackFitter->GetNpoints();
4120 //_____________________________________________________________________________
4121 void AliTRDtrackerV1::AliTRDtrackFitterRieman::UpdateFitters(const AliTRDseedV1 * const tracklet){
4123 // Does the transformations and updates the fitters
4124 // The following transformation is applied
4126 AliTRDcluster *cl = NULL;
4127 Double_t x, y, z, dx, t, w, we, yerr, zerr;
4129 if(!tracklet || !tracklet->IsOK()) return;
4130 Double_t tilt = tracklet->GetTilt();
4131 for(Int_t itb = 0; itb < AliTRDseedV1::kNclusters; itb++){
4132 if(!(cl = tracklet->GetClusters(itb))) continue;
4133 if(!cl->IsInChamber()) continue;
4134 if (!tracklet->IsUsable(itb)) continue;
4141 uvt[0] = 2. * x * t;
4143 uvt[2] = 2. * tilt * t;
4144 uvt[3] = 2. * tilt * dx * t;
4145 w = 2. * (y + tilt*z) * t;
4146 // error definition changes for the different calls
4148 we *= TMath::Sqrt(cl->GetSigmaY2()+tilt*tilt*cl->GetSigmaZ2());
4149 // Update sums for error calculation
4150 yerr = 1./(TMath::Sqrt(cl->GetSigmaY2()) + fSysClusterError);
4152 zerr = 1./cl->GetSigmaZ2();
4153 for(Int_t ipol = 0; ipol < 5; ipol++){
4154 fSumPolY[ipol] += yerr;
4157 fSumPolZ[ipol] += zerr;
4161 fTrackFitter->AddPoint(uvt, w, we);
4162 fZfitter->AddPoint(&x, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
4166 //_____________________________________________________________________________
4167 Bool_t AliTRDtrackerV1::AliTRDtrackFitterRieman::CheckAcceptable(Double_t offset, Double_t slope){
4169 // Check whether z-results are acceptable
4170 // Definition: Distance between tracklet fit and track fit has to be
4171 // less then half a padlength
4172 // Point of comparision is at the anode wire
4174 Bool_t acceptablez = kTRUE;
4175 Double_t zref = 0.0;
4176 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
4177 if(!fTracklets[iLayer]->IsOK()) continue;
4178 zref = offset + slope * (fTracklets[iLayer]->GetX0() - fXref);
4179 if (TMath::Abs(fTracklets[iLayer]->GetZfit(0) - zref) > fTracklets[iLayer]->GetPadLength() * 0.5 + 1.0)
4180 acceptablez = kFALSE;
4185 //_____________________________________________________________________________
4186 Double_t AliTRDtrackerV1::AliTRDtrackFitterRieman::GetYat(Double_t x) const {
4188 // Calculate y position out of the track parameters
4189 // y: R^2 = (x - x0)^2 + (y - y0)^2
4190 // => y = y0 +/- Sqrt(R^2 - (x - x0)^2)
4191 // R = Sqrt() = 1/Curvature
4192 // => y = y0 +/- Sqrt(1/Curvature^2 - (x - x0)^2)
4195 Double_t disc = (x * fParameters[0] + fParameters[1]);
4196 disc = 1 - fParameters[0]*fParameters[2] + fParameters[1]*fParameters[1] - disc*disc;
4198 disc = TMath::Sqrt(disc);
4199 y = (1.0 - disc) / fParameters[0];
4204 //_____________________________________________________________________________
4205 Double_t AliTRDtrackerV1::AliTRDtrackFitterRieman::GetZat(Double_t x) const {
4207 // Return z position for a given x position
4208 // Simple linear function
4210 return fParameters[3] + fParameters[4] * (x - fXref);
4213 //_____________________________________________________________________________
4214 Double_t AliTRDtrackerV1::AliTRDtrackFitterRieman::GetDyDxAt(Double_t x) const {
4216 // Calculate dydx at a given radial position out of the track parameters
4217 // dy: R^2 = (x - x0)^2 + (y - y0)^2
4218 // => y = +/- Sqrt(R^2 - (x - x0)^2) + y0
4219 // => dy/dx = (x - x0)/Sqrt(R^2 - (x - x0)^2)
4220 // Curvature: cr = 1/R = a/Sqrt(1 + b^2 - c*a)
4221 // => dy/dx = (x - x0)/(1/(cr^2) - (x - x0)^2)
4223 Double_t x0 = -fParameters[1] / fParameters[0];
4224 Double_t curvature = GetCurvature();
4226 if (-fParameters[2] * fParameters[0] + fParameters[1] * fParameters[1] + 1 > 0) {
4227 if (1.0/(curvature * curvature) - (x - x0) * (x - x0) > 0.0) {
4228 Double_t yderiv = (x - x0) / TMath::Sqrt(1.0/(curvature * curvature) - (x - x0) * (x - x0));
4229 if (fParameters[0] < 0) yderiv *= -1.0;
4236 //_____________________________________________________________________________
4237 Double_t AliTRDtrackerV1::AliTRDtrackFitterRieman::GetCurvature() const {
4239 // Calculate track curvature
4242 Double_t curvature = 1.0 + fParameters[1]*fParameters[1] - fParameters[2]*fParameters[0];
4243 if (curvature > 0.0)
4244 curvature = fParameters[0] / TMath::Sqrt(curvature);
4248 //_____________________________________________________________________________
4249 void AliTRDtrackerV1::AliTRDtrackFitterRieman::GetCovAt(Double_t x, Double_t *cov) const {
4251 // Error Definition according to gauss error propagation
4253 TMatrixD transform(3,3);
4254 transform(0,0) = transform(1,1) = transform(2,2) = 1;
4255 transform(0,1) = transform(1,2) = x;
4256 transform(0,2) = x*x;
4257 TMatrixD covariance(transform, TMatrixD::kMult, *fCovarPolY);
4258 covariance *= transform.T();
4259 cov[0] = covariance(0,0);
4260 TMatrixD transformZ(2,2);
4261 transformZ(0,0) = transformZ(1,1) = 1;
4262 transformZ(0,1) = x;
4263 TMatrixD covarZ(transformZ, TMatrixD::kMult, *fCovarPolZ);
4264 covarZ *= transformZ.T();
4265 cov[1] = covarZ(0,0);
4269 //____________________________________________________________________
4270 Double_t AliTRDtrackerV1::AliTRDtrackFitterRieman::CalculateReferenceX(){
4272 // Calculates the reference x-position for the tilted Rieman fit defined as middle
4273 // of the stack (middle between layers 2 and 3). For the calculation all the tracklets
4274 // are taken into account
4276 // Parameters: - Array of tracklets(AliTRDseedV1)
4278 // Output: - The reference x-position(Float_t)
4280 Int_t nDistances = 0;
4281 Float_t meanDistance = 0.;
4282 Int_t startIndex = 5;
4283 for(Int_t il =5; il > 0; il--){
4284 if(fTracklets[il]->IsOK() && fTracklets[il -1]->IsOK()){
4285 Float_t xdiff = fTracklets[il]->GetX0() - fTracklets[il -1]->GetX0();
4286 meanDistance += xdiff;
4289 if(fTracklets[il]->IsOK()) startIndex = il;
4291 if(fTracklets[0]->IsOK()) startIndex = 0;
4293 // We should normally never get here
4294 Float_t xpos[2]; memset(xpos, 0, sizeof(Float_t) * 2);
4295 Int_t iok = 0, idiff = 0;
4296 // This attempt is worse and should be avoided:
4297 // check for two chambers which are OK and repeat this without taking the mean value
4298 // Strategy avoids a division by 0;
4299 for(Int_t il = 5; il >= 0; il--){
4300 if(fTracklets[il]->IsOK()){
4301 xpos[iok] = fTracklets[il]->GetX0();
4305 if(iok) idiff++; // to get the right difference;
4309 meanDistance = (xpos[0] - xpos[1])/idiff;
4312 // we have do not even have 2 layers which are OK? The we do not need to fit at all
4317 meanDistance /= nDistances;
4319 return fTracklets[startIndex]->GetX0() + (2.5 - startIndex) * meanDistance - 0.5 * (AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick());