- removed unused array
[u/mrichter/AliRoot.git] / TRD / AliTRDtrackerV1.cxx
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e4f2f73d 1/**************************************************************************
972ef65e 2* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
3* *
4* Author: The ALICE Off-line Project. *
5* Contributors are mentioned in the code where appropriate. *
6* *
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**************************************************************************/
e4f2f73d 15
16/* $Id$ */
17
18///////////////////////////////////////////////////////////////////////////////
19// //
20// Track finder //
21// //
22// Authors: //
23// Alex Bercuci <A.Bercuci@gsi.de> //
24// Markus Fasel <M.Fasel@gsi.de> //
25// //
26///////////////////////////////////////////////////////////////////////////////
27
e4f2f73d 28#include <TBranch.h>
bb56afff 29#include <TDirectory.h>
e4f2f73d 30#include <TLinearFitter.h>
e4f2f73d 31#include <TTree.h>
32#include <TClonesArray.h>
e4f2f73d 33#include <TTreeStream.h>
eb2b4f91 34#include <TGeoMatrix.h>
35#include <TGeoManager.h>
e4f2f73d 36
37#include "AliLog.h"
fac58f00 38#include "AliMathBase.h"
e4f2f73d 39#include "AliESDEvent.h"
bb56afff 40#include "AliGeomManager.h"
e4f2f73d 41#include "AliRieman.h"
42#include "AliTrackPointArray.h"
43
e4f2f73d 44#include "AliTRDgeometry.h"
45#include "AliTRDpadPlane.h"
e4f2f73d 46#include "AliTRDcalibDB.h"
e4f2f73d 47#include "AliTRDReconstructor.h"
48#include "AliTRDCalibraFillHisto.h"
e4f2f73d 49#include "AliTRDrecoParam.h"
bb56afff 50
51#include "AliTRDcluster.h"
828c6f80 52#include "AliTRDdigitsParam.h"
e4f2f73d 53#include "AliTRDseedV1.h"
0906e73e 54#include "AliTRDtrackV1.h"
bb56afff 55#include "AliTRDtrackerV1.h"
56#include "AliTRDtrackerDebug.h"
57#include "AliTRDtrackingChamber.h"
58#include "AliTRDchamberTimeBin.h"
59
e4f2f73d 60ClassImp(AliTRDtrackerV1)
903326c1 61ClassImp(AliTRDtrackerV1::AliTRDLeastSquare)
62ClassImp(AliTRDtrackerV1::AliTRDtrackFitterRieman)
eb38ed55 63
eb38ed55 64const Float_t AliTRDtrackerV1::fgkMinClustersInTrack = 0.5; //
65const Float_t AliTRDtrackerV1::fgkLabelFraction = 0.8; //
66const Double_t AliTRDtrackerV1::fgkMaxChi2 = 12.0; //
67const Double_t AliTRDtrackerV1::fgkMaxSnp = 0.95; // Maximum local sine of the azimuthal angle
68const Double_t AliTRDtrackerV1::fgkMaxStep = 2.0; // Maximal step size in propagation
d76231c8 69Double_t AliTRDtrackerV1::fgTopologicQA[kNConfigs] = {
6e39bde4 70 0.5112, 0.5112, 0.5112, 0.0786, 0.0786,
41702fec 71 0.0786, 0.0786, 0.0579, 0.0579, 0.0474,
72 0.0474, 0.0408, 0.0335, 0.0335, 0.0335
e165b64b 73};
74const Double_t AliTRDtrackerV1::fgkX0[kNPlanes] = {
75 300.2, 312.8, 325.4, 338.0, 350.6, 363.2};
2985ffcb 76Int_t AliTRDtrackerV1::fgNTimeBins = 0;
4d6aee34 77AliRieman* AliTRDtrackerV1::fgRieman = NULL;
78TLinearFitter* AliTRDtrackerV1::fgTiltedRieman = NULL;
79TLinearFitter* AliTRDtrackerV1::fgTiltedRiemanConstrained = NULL;
e4f2f73d 80
81//____________________________________________________________________
3a039a31 82AliTRDtrackerV1::AliTRDtrackerV1(AliTRDReconstructor *rec)
41702fec 83 :AliTracker()
4d6aee34 84 ,fkReconstructor(NULL)
9e85cb05 85 ,fkRecoParam(NULL)
4d6aee34 86 ,fGeom(NULL)
87 ,fClusters(NULL)
88 ,fTracklets(NULL)
89 ,fTracks(NULL)
b1135f96 90 ,fTracksESD(NULL)
41702fec 91 ,fSieveSeeding(0)
e4f2f73d 92{
41702fec 93 //
94 // Default constructor.
95 //
eb2b4f91 96
97 SetReconstructor(rec); // initialize reconstructor
98
99 // initialize geometry
100 if(!AliGeomManager::GetGeometry()){
101 AliFatal("Could not get geometry.");
102 }
103 fGeom = new AliTRDgeometry();
104 fGeom->CreateClusterMatrixArray();
4d6aee34 105 TGeoHMatrix *matrix = NULL;
eb2b4f91 106 Double_t loc[] = {0., 0., 0.};
107 Double_t glb[] = {0., 0., 0.};
108 for(Int_t ily=kNPlanes; ily--;){
e165b64b 109 Int_t ism = 0;
110 while(!(matrix = fGeom->GetClusterMatrix(AliTRDgeometry::GetDetector(ily, 2, ism)))) ism++;
111 if(!matrix){
112 AliError(Form("Could not get transformation matrix for layer %d. Use default.", ily));
113 fR[ily] = fgkX0[ily];
eb2b4f91 114 continue;
115 }
116 matrix->LocalToMaster(loc, glb);
117 fR[ily] = glb[0]+ AliTRDgeometry::AnodePos()-.5*AliTRDgeometry::AmThick() - AliTRDgeometry::DrThick();
118 }
119
eb2b4f91 120 // initialize cluster containers
053767a4 121 for (Int_t isector = 0; isector < AliTRDgeometry::kNsector; isector++) new(&fTrSec[isector]) AliTRDtrackingSector(fGeom, isector);
3a039a31 122
eb2b4f91 123 // initialize arrays
124 memset(fTrackQuality, 0, kMaxTracksStack*sizeof(Double_t));
125 memset(fSeedLayer, 0, kMaxTracksStack*sizeof(Int_t));
126 memset(fSeedTB, 0, kNSeedPlanes*sizeof(AliTRDchamberTimeBin*));
b1135f96 127 fTracksESD = new TClonesArray("AliESDtrack", 2*kMaxTracksStack);
128 fTracksESD->SetOwner();
eb38ed55 129}
130
e4f2f73d 131//____________________________________________________________________
132AliTRDtrackerV1::~AliTRDtrackerV1()
133{
41702fec 134 //
135 // Destructor
136 //
137
4d6aee34 138 if(fgRieman) delete fgRieman; fgRieman = NULL;
139 if(fgTiltedRieman) delete fgTiltedRieman; fgTiltedRieman = NULL;
140 if(fgTiltedRiemanConstrained) delete fgTiltedRiemanConstrained; fgTiltedRiemanConstrained = NULL;
d611c74f 141 for(Int_t isl =0; isl<kNSeedPlanes; isl++) if(fSeedTB[isl]) delete fSeedTB[isl];
b1135f96 142 if(fTracksESD){ fTracksESD->Delete(); delete fTracksESD; }
41702fec 143 if(fTracks) {fTracks->Delete(); delete fTracks;}
144 if(fTracklets) {fTracklets->Delete(); delete fTracklets;}
48f8adf3 145 if(fClusters) {
146 fClusters->Delete(); delete fClusters;
147 }
41702fec 148 if(fGeom) delete fGeom;
e4f2f73d 149}
150
151//____________________________________________________________________
152Int_t AliTRDtrackerV1::Clusters2Tracks(AliESDEvent *esd)
153{
41702fec 154 //
155 // Steering stand alone tracking for full TRD detector
156 //
157 // Parameters :
158 // esd : The ESD event. On output it contains
159 // the ESD tracks found in TRD.
160 //
161 // Output :
162 // Number of tracks found in the TRD detector.
163 //
164 // Detailed description
165 // 1. Launch individual SM trackers.
166 // See AliTRDtrackerV1::Clusters2TracksSM() for details.
167 //
168
9e85cb05 169 if(!fkRecoParam){
3a039a31 170 AliError("Reconstruction configuration not initialized. Call first AliTRDReconstructor::SetRecoParam().");
41702fec 171 return 0;
172 }
173
174 //AliInfo("Start Track Finder ...");
175 Int_t ntracks = 0;
053767a4 176 for(int ism=0; ism<AliTRDgeometry::kNsector; ism++){
41702fec 177 // for(int ism=1; ism<2; ism++){
178 //AliInfo(Form("Processing supermodule %i ...", ism));
179 ntracks += Clusters2TracksSM(ism, esd);
180 }
980d5a2a 181 AliInfo(Form("Number of tracks: !TRDin[%d]", ntracks));
41702fec 182 return ntracks;
e4f2f73d 183}
184
0906e73e 185
186//_____________________________________________________________________________
eb38ed55 187Bool_t AliTRDtrackerV1::GetTrackPoint(Int_t index, AliTrackPoint &p) const
0906e73e 188{
41702fec 189 //AliInfo(Form("Asking for tracklet %d", index));
190
84eab75a 191 // reset position of the point before using it
192 p.SetXYZ(0., 0., 0.);
2f7514a6 193 AliTRDseedV1 *tracklet = GetTracklet(index);
194 if (!tracklet) return kFALSE;
84eab75a 195
41702fec 196 // get detector for this tracklet
e165b64b 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);
41702fec 202 Double_t local[3];
e165b64b 203 local[0] = tracklet->GetX();
204 local[1] = tracklet->GetY();
205 local[2] = tracklet->GetZ();
41702fec 206 Double_t global[3];
e165b64b 207 fGeom->RotateBack(det, local, global);
208
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;
216 cov[5] = cov2D[2];
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);
41702fec 219
220 // setting volume id
e165b64b 221 AliGeomManager::ELayerID iLayer = AliGeomManager::ELayerID(AliGeomManager::kTRD1+fGeom->GetLayer(det));
222 Int_t modId = fGeom->GetSector(det) * AliTRDgeometry::kNstack + fGeom->GetStack(det);
41702fec 223 UShort_t volid = AliGeomManager::LayerToVolUID(iLayer, modId);
224 p.SetVolumeID(volid);
225
226 return kTRUE;
0906e73e 227}
228
eb38ed55 229//____________________________________________________________________
230TLinearFitter* AliTRDtrackerV1::GetTiltedRiemanFitter()
231{
41702fec 232 if(!fgTiltedRieman) fgTiltedRieman = new TLinearFitter(4, "hyp4");
233 return fgTiltedRieman;
eb38ed55 234}
0906e73e 235
eb38ed55 236//____________________________________________________________________
237TLinearFitter* AliTRDtrackerV1::GetTiltedRiemanFitterConstraint()
238{
41702fec 239 if(!fgTiltedRiemanConstrained) fgTiltedRiemanConstrained = new TLinearFitter(2, "hyp2");
240 return fgTiltedRiemanConstrained;
eb38ed55 241}
41702fec 242
eb38ed55 243//____________________________________________________________________
244AliRieman* AliTRDtrackerV1::GetRiemanFitter()
245{
fac58f00 246 if(!fgRieman) fgRieman = new AliRieman(AliTRDseedV1::kNtb * AliTRDgeometry::kNlayer);
41702fec 247 return fgRieman;
eb38ed55 248}
41702fec 249
0906e73e 250//_____________________________________________________________________________
251Int_t AliTRDtrackerV1::PropagateBack(AliESDEvent *event)
252{
2a3191bb 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.
260//
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.
271//
272
e3d45279 273 if(!fClusters || !fClusters->GetEntriesFast()){
274 AliInfo("No TRD clusters");
275 return 0;
276 }
2a3191bb 277 AliTRDCalibraFillHisto *calibra = AliTRDCalibraFillHisto::Instance(); // Calibration monitor
e3d45279 278 if (!calibra) AliInfo("Could not get Calibra instance");
c6f7c6cb 279 if (!fgNTimeBins) fgNTimeBins = fkReconstructor->GetNTimeBins();
828c6f80 280
eb2b4f91 281 // Define scalers
282 Int_t nFound = 0, // number of tracks found
b453ef55 283 nBacked = 0, // number of tracks backed up for refit
eb2b4f91 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
41702fec 287 Float_t foundMin = 20.0;
288
4d6aee34 289 Float_t *quality = NULL;
290 Int_t *index = NULL;
eb2b4f91 291 nSeeds = event->GetNumberOfTracks();
292 // Sort tracks according to quality
293 // (covariance in the yz plane)
294 if(nSeeds){
295 quality = new Float_t[nSeeds];
296 index = new Int_t[nSeeds];
297 for (Int_t iSeed = nSeeds; iSeed--;) {
d611c74f 298 AliESDtrack *seed = event->GetTrack(iSeed);
299 Double_t covariance[15];
300 seed->GetExternalCovariance(covariance);
301 quality[iSeed] = covariance[0] + covariance[2];
302 }
eb2b4f91 303 TMath::Sort(nSeeds, quality, index,kFALSE);
41702fec 304 }
41702fec 305
eb2b4f91 306 // Propagate all seeds
41702fec 307 Int_t expectedClr;
308 AliTRDtrackV1 track;
eb2b4f91 309 for (Int_t iSeed = 0; iSeed < nSeeds; iSeed++) {
41702fec 310
311 // Get the seeds in sorted sequence
312 AliESDtrack *seed = event->GetTrack(index[iSeed]);
eb2b4f91 313 Float_t p4 = seed->GetC(seed->GetBz());
41702fec 314
315 // Check the seed status
316 ULong_t status = seed->GetStatus();
317 if ((status & AliESDtrack::kTPCout) == 0) continue;
318 if ((status & AliESDtrack::kTRDout) != 0) continue;
eb2b4f91 319
320 // Propagate to the entrance in the TRD mother volume
41702fec 321 new(&track) AliTRDtrackV1(*seed);
eb2b4f91 322 if(AliTRDgeometry::GetXtrdBeg() > (fgkMaxStep + track.GetX()) && !PropagateToX(track, AliTRDgeometry::GetXtrdBeg(), fgkMaxStep)){
323 seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
324 continue;
325 }
326 if(!AdjustSector(&track)){
327 seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
328 continue;
329 }
330 if(TMath::Abs(track.GetSnp()) > fgkMaxSnp) {
331 seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
332 continue;
333 }
334
335 nTPCseeds++;
e4d4864b 336
eb2b4f91 337 // store track status at TRD entrance
76b60503 338 seed->UpdateTrackParams(&track, AliESDtrack::kTRDbackup);
ae3fbe1f 339
eb2b4f91 340 // prepare track and do propagation in the TRD
4d6aee34 341 track.SetReconstructor(fkReconstructor);
eb2b4f91 342 track.SetKink(Bool_t(seed->GetKinkIndex(0)));
343 expectedClr = FollowBackProlongation(track);
344 // check if track entered the TRD fiducial volume
a310e49b 345 if(track.GetTrackIn()){
eb2b4f91 346 seed->UpdateTrackParams(&track, AliESDtrack::kTRDin);
347 nTRDseeds++;
348 }
349 // check if track was stopped in the TRD
350 if (expectedClr<0){
351 seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
352 continue;
353 }
ae3fbe1f 354
355 if(expectedClr){
eb2b4f91 356 nFound++;
41702fec 357 // computes PID for track
358 track.CookPID();
359 // update calibration references using this track
360 if(calibra->GetHisto2d()) calibra->UpdateHistogramsV1(&track);
361 // save calibration object
2d73d21c 362 if (fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 0) {
224f357f 363 AliTRDtrackV1 *calibTrack = new AliTRDtrackV1(track);
364 calibTrack->SetOwner();
365 seed->AddCalibObject(calibTrack);
366 }
367 //update ESD track
050875b0 368 seed->UpdateTrackParams(&track, AliESDtrack::kTRDout);
369 track.UpdateESDtrack(seed);
41702fec 370 }
371
27fbeba8 372 if ((TMath::Abs(track.GetC(track.GetBz()) - p4) / TMath::Abs(p4) < 0.2) ||(track.Pt() > 0.8)) {
e3cf3d02 373
41702fec 374 // Make backup for back propagation
41702fec 375 Int_t foundClr = track.GetNumberOfClusters();
376 if (foundClr >= foundMin) {
41702fec 377 track.CookLabel(1. - fgkLabelFraction);
f29f13a6 378 //if(track.GetBackupTrack()) UseClusters(track.GetBackupTrack());
41702fec 379
380 // Sign only gold tracks
381 if (track.GetChi2() / track.GetNumberOfClusters() < 4) {
f29f13a6 382 //if ((seed->GetKinkIndex(0) == 0) && (track.Pt() < 1.5)) UseClusters(&track);
41702fec 383 }
384 Bool_t isGold = kFALSE;
385
386 // Full gold track
387 if (track.GetChi2() / track.GetNumberOfClusters() < 5) {
388 if (track.GetBackupTrack()) seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup);
b453ef55 389 nBacked++;
41702fec 390 isGold = kTRUE;
391 }
392
393 // Almost gold track
394 if ((!isGold) && (track.GetNCross() == 0) && (track.GetChi2() / track.GetNumberOfClusters() < 7)) {
395 //seed->UpdateTrackParams(track, AliESDtrack::kTRDbackup);
396 if (track.GetBackupTrack()) seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup);
b453ef55 397 nBacked++;
41702fec 398 isGold = kTRUE;
399 }
400
401 if ((!isGold) && (track.GetBackupTrack())) {
402 if ((track.GetBackupTrack()->GetNumberOfClusters() > foundMin) && ((track.GetBackupTrack()->GetChi2()/(track.GetBackupTrack()->GetNumberOfClusters()+1)) < 7)) {
403 seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup);
b453ef55 404 nBacked++;
41702fec 405 isGold = kTRUE;
406 }
407 }
41702fec 408 }
409 }
410
eb2b4f91 411 // Propagation to the TOF
412 if(!(seed->GetStatus()&AliESDtrack::kTRDStop)) {
413 Int_t sm = track.GetSector();
414 // default value in case we have problems with the geometry.
415 Double_t xtof = 371.;
416 //Calculate radial position of the beginning of the TOF
417 //mother volume. In order to avoid mixing of the TRD
418 //and TOF modules some hard values are needed. This are:
419 //1. The path to the TOF module.
420 //2. The width of the TOF (29.05 cm)
421 //(with the help of Annalisa de Caro Mar-17-2009)
422 if(gGeoManager){
423 gGeoManager->cd(Form("/ALIC_1/B077_1/BSEGMO%d_1/BTOF%d_1", sm, sm));
4d6aee34 424 TGeoHMatrix *m = NULL;
eb2b4f91 425 Double_t loc[]={0., 0., -.5*29.05}, glob[3];
426
427 if((m=gGeoManager->GetCurrentMatrix())){
428 m->LocalToMaster(loc, glob);
429 xtof = TMath::Sqrt(glob[0]*glob[0]+glob[1]*glob[1]);
430 }
41702fec 431 }
672b48bd 432 if(xtof > (fgkMaxStep + track.GetX()) && !PropagateToX(track, xtof, fgkMaxStep)){
433 seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
434 continue;
435 }
436 if(!AdjustSector(&track)){
437 seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
438 continue;
439 }
440 if(TMath::Abs(track.GetSnp()) > fgkMaxSnp){
441 seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
442 continue;
443 }
050875b0 444 //seed->UpdateTrackParams(&track, AliESDtrack::kTRDout);
eb2b4f91 445 // TODO obsolete - delete
446 seed->SetTRDQuality(track.StatusForTOF());
41702fec 447 }
41702fec 448 seed->SetTRDBudget(track.GetBudget(0));
449 }
d611c74f 450 if(index) delete [] index;
451 if(quality) delete [] quality;
41702fec 452
d4cf71ca 453 AliInfo(Form("Number of seeds: TPCout[%d] TRDin[%d]", nTPCseeds, nTRDseeds));
b453ef55 454 AliInfo(Form("Number of tracks: TRDout[%d] TRDbackup[%d]", nFound, nBacked));
d4cf71ca 455
d611c74f 456 // run stand alone tracking
4d6aee34 457 if (fkReconstructor->IsSeeding()) Clusters2Tracks(event);
41702fec 458
459 return 0;
0906e73e 460}
461
462
463//____________________________________________________________________
464Int_t AliTRDtrackerV1::RefitInward(AliESDEvent *event)
465{
41702fec 466 //
467 // Refits tracks within the TRD. The ESD event is expected to contain seeds
468 // at the outer part of the TRD.
469 // The tracks are propagated to the innermost time bin
470 // of the TRD and the ESD event is updated
471 // Origin: Thomas KUHR (Thomas.Kuhr@cern.ch)
472 //
473
474 Int_t nseed = 0; // contor for loaded seeds
475 Int_t found = 0; // contor for updated TRD tracks
476
477
e3d45279 478 if(!fClusters || !fClusters->GetEntriesFast()){
479 AliInfo("No TRD clusters");
480 return 0;
481 }
41702fec 482 AliTRDtrackV1 track;
483 for (Int_t itrack = 0; itrack < event->GetNumberOfTracks(); itrack++) {
484 AliESDtrack *seed = event->GetTrack(itrack);
050875b0 485 ULong_t status = seed->GetStatus();
41702fec 486
050875b0 487 new(&track) AliTRDtrackV1(*seed);
41702fec 488 if (track.GetX() < 270.0) {
489 seed->UpdateTrackParams(&track, AliESDtrack::kTRDbackup);
490 continue;
491 }
492
e3cf3d02 493 // reject tracks which failed propagation in the TRD or
494 // are produced by the TRD stand alone tracker
e3cf3d02 495 if(!(status & AliESDtrack::kTRDout)) continue;
496 if(!(status & AliESDtrack::kTRDin)) continue;
41702fec 497 nseed++;
498
499 track.ResetCovariance(50.0);
500
501 // do the propagation and processing
502 Bool_t kUPDATE = kFALSE;
503 Double_t xTPC = 250.0;
504 if(FollowProlongation(track)){
e3cf3d02 505 // Update the friend track
2d73d21c 506 if (fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 0){
4d6aee34 507 TObject *o = NULL; Int_t ic = 0;
508 AliTRDtrackV1 *calibTrack = NULL;
e3cf3d02 509 while((o = seed->GetCalibObject(ic++))){
510 if(!(calibTrack = dynamic_cast<AliTRDtrackV1*>(o))) continue;
a310e49b 511 calibTrack->SetTrackOut(&track);
e3cf3d02 512 }
41702fec 513 }
a310e49b 514
515 // Prolongate to TPC
516 if (PropagateToX(track, xTPC, fgkMaxStep)) { // -with update
517 seed->UpdateTrackParams(&track, AliESDtrack::kTRDrefit);
518 found++;
519 kUPDATE = kTRUE;
520 }
e3cf3d02 521 }
41702fec 522
523 // Prolongate to TPC without update
524 if(!kUPDATE) {
525 AliTRDtrackV1 tt(*seed);
e3cf3d02 526 if (PropagateToX(tt, xTPC, fgkMaxStep)) seed->UpdateTrackParams(&tt, AliESDtrack::kTRDbackup);
41702fec 527 }
528 }
980d5a2a 529 AliInfo(Form("Number of seeds: TRDout[%d]", nseed));
530 AliInfo(Form("Number of tracks: TRDrefit[%d]", found));
41702fec 531
532 return 0;
0906e73e 533}
534
0906e73e 535//____________________________________________________________________
536Int_t AliTRDtrackerV1::FollowProlongation(AliTRDtrackV1 &t)
537{
41702fec 538 // Extrapolates the TRD track in the TPC direction.
539 //
540 // Parameters
541 // t : the TRD track which has to be extrapolated
542 //
543 // Output
544 // number of clusters attached to the track
545 //
546 // Detailed description
547 //
548 // Starting from current radial position of track <t> this function
549 // extrapolates the track through the 6 TRD layers. The following steps
550 // are being performed for each plane:
551 // 1. prepare track:
552 // a. get plane limits in the local x direction
553 // b. check crossing sectors
554 // c. check track inclination
555 // 2. search tracklet in the tracker list (see GetTracklet() for details)
556 // 3. evaluate material budget using the geo manager
557 // 4. propagate and update track using the tracklet information.
558 //
559 // Debug level 2
560 //
561
562 Int_t nClustersExpected = 0;
e3cf3d02 563 for (Int_t iplane = kNPlanes; iplane--;) {
17896e82 564 Int_t index(-1);
41702fec 565 AliTRDseedV1 *tracklet = GetTracklet(&t, iplane, index);
17896e82 566 AliDebug(2, Form("Tracklet[%p] ly[%d] idx[%d]", (void*)tracklet, iplane, index));
41702fec 567 if(!tracklet) continue;
980d5a2a 568 if(!tracklet->IsOK()){
569 AliDebug(1, Form("Tracklet Det[%d] !OK", tracklet->GetDetector()));
570 continue;
571 }
e3cf3d02 572 Double_t x = tracklet->GetX();//GetX0();
41702fec 573 // reject tracklets which are not considered for inward refit
574 if(x > t.GetX()+fgkMaxStep) continue;
575
576 // append tracklet to track
577 t.SetTracklet(tracklet, index);
578
579 if (x < (t.GetX()-fgkMaxStep) && !PropagateToX(t, x+fgkMaxStep, fgkMaxStep)) break;
580 if (!AdjustSector(&t)) break;
581
582 // Start global position
583 Double_t xyz0[3];
584 t.GetXYZ(xyz0);
585
586 // End global position
587 Double_t alpha = t.GetAlpha(), y, z;
588 if (!t.GetProlongation(x,y,z)) break;
589 Double_t xyz1[3];
590 xyz1[0] = x * TMath::Cos(alpha) - y * TMath::Sin(alpha);
591 xyz1[1] = x * TMath::Sin(alpha) + y * TMath::Cos(alpha);
592 xyz1[2] = z;
593
51a23065 594 Double_t length = TMath::Sqrt(
595 (xyz0[0]-xyz1[0])*(xyz0[0]-xyz1[0]) +
596 (xyz0[1]-xyz1[1])*(xyz0[1]-xyz1[1]) +
597 (xyz0[2]-xyz1[2])*(xyz0[2]-xyz1[2])
598 );
599 if(length>0.){
600 // Get material budget
601 Double_t param[7];
602 if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param)<=0.) break;
603 Double_t xrho= param[0]*param[4];
604 Double_t xx0 = param[1]; // Get mean propagation parameters
605
606 // Propagate and update
607 t.PropagateTo(x, xx0, xrho);
608 if (!AdjustSector(&t)) break;
609 }
e3cf3d02 610
b72f4eaf 611 Double_t cov[3]; tracklet->GetCovAt(x, cov);
612 Double_t p[2] = { tracklet->GetY(), tracklet->GetZ()};
613 Double_t chi2 = ((AliExternalTrackParam)t).GetPredictedChi2(p, cov);
614 if (chi2 < 1e+10 && t.Update(p, cov, chi2)){
41702fec 615 nClustersExpected += tracklet->GetN();
616 }
617 }
618
9e85cb05 619 if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 1){
41702fec 620 Int_t index;
51a23065 621 for(int iplane=0; iplane<AliTRDgeometry::kNlayer; iplane++){
41702fec 622 AliTRDseedV1 *tracklet = GetTracklet(&t, iplane, index);
623 if(!tracklet) continue;
624 t.SetTracklet(tracklet, index);
625 }
626
a2fbb6ec 627 if(fkReconstructor->IsDebugStreaming()){
628 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
629 TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
630 AliTRDtrackV1 track(t);
631 track.SetOwner();
632 cstreamer << "FollowProlongation"
633 << "EventNumber=" << eventNumber
634 << "ncl=" << nClustersExpected
635 << "track.=" << &track
636 << "\n";
637 }
41702fec 638 }
41702fec 639 return nClustersExpected;
0906e73e 640
641}
642
643//_____________________________________________________________________________
644Int_t AliTRDtrackerV1::FollowBackProlongation(AliTRDtrackV1 &t)
645{
afa21247 646// Extrapolates/Build the TRD track in the TOF direction.
647//
648// Parameters
649// t : the TRD track which has to be extrapolated
650//
651// Output
652// number of clusters attached to the track
653//
654// Starting from current radial position of track <t> this function
655// extrapolates the track through the 6 TRD layers. The following steps
656// are being performed for each plane:
657// 1. Propagate track to the entrance of the next chamber:
658// - get chamber limits in the radial direction
659// - check crossing sectors
660// - check track inclination
661// - check track prolongation against boundary conditions (see exclusion boundaries on AliTRDgeometry::IsOnBoundary())
662// 2. Build tracklet (see AliTRDseed::AttachClusters() for details) for this layer if needed. If only
663// Kalman filter is needed and tracklets are already linked to the track this step is skipped.
664// 3. Fit tracklet using the information from the Kalman filter.
665// 4. Propagate and update track at reference radial position of the tracklet.
666// 5. Register tracklet with the tracker and track; update pulls monitoring.
667//
668// Observation
2a3191bb 669// 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:
670// - AliTRDtrackV1::kProlongation : track prolongation failed
671// - AliTRDtrackV1::kPropagation : track prolongation failed
672// - AliTRDtrackV1::kAdjustSector : failed during sector crossing
673// - AliTRDtrackV1::kSnp : too large bending
674// - AliTRDtrackV1::kTrackletInit : fail to initialize tracklet
675// - AliTRDtrackV1::kUpdate : fail to attach clusters or fit the tracklet
676// - AliTRDtrackV1::kUnknown : anything which is not covered before
afa21247 677// 2. By default the status of the track before first TRD update is saved.
678//
679// Debug level 2
680//
681// Author
682// Alexandru Bercuci <A.Bercuci@gsi.de>
683//
41702fec 684
eb2b4f91 685 Int_t n = 0;
686 Double_t driftLength = .5*AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick();
4d6aee34 687 AliTRDtrackingChamber *chamber = NULL;
41702fec 688
9e85cb05 689 Int_t debugLevel = fkReconstructor->IsDebugStreaming() ? fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) : 0;
7c3eecb8 690 TTreeSRedirector *cstreamer = fkReconstructor->IsDebugStreaming() ? fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker) : 0x0;
691
68f9b6bd 692 Bool_t kStoreIn(kTRUE), //
693 kPropagateIn(kTRUE), //
694 kStandAlone(kFALSE), // toggle tracker awarness of stand alone seeding
695 kUseTRD(fkRecoParam->IsOverPtThreshold(t.Pt()));// use TRD measurment to update Kalman
696
697 Int_t startLayer(0);
4d6aee34 698 AliTRDseedV1 tracklet, *ptrTracklet = NULL;
68f9b6bd 699 // Special case for stand alone tracking
700 // - store all tracklets found by seeding
701 // - start propagation from first tracklet found
181d2c97 702 AliTRDseedV1 *tracklets[kNPlanes];
703 memset(tracklets, 0, sizeof(AliTRDseedV1 *) * kNPlanes);
68f9b6bd 704 for(Int_t ip(kNPlanes); ip--;){
705 if(!(tracklets[ip] = t.GetTracklet(ip))) continue;
181d2c97 706 t.UnsetTracklet(ip);
68f9b6bd 707 if(tracklets[ip]->IsOK()) startLayer=ip;
708 kStandAlone = kTRUE;
181d2c97 709 }
68f9b6bd 710 AliDebug(4, Form("SA[%c] Start[%d]\n"
711 " [0]idx[%d] traklet[%p]\n"
712 " [1]idx[%d] traklet[%p]\n"
713 " [2]idx[%d] traklet[%p]\n"
714 " [3]idx[%d] traklet[%p]\n"
715 " [4]idx[%d] traklet[%p]\n"
716 " [5]idx[%d] traklet[%p]"
717 , kStandAlone?'y':'n', startLayer
718 , t.GetTrackletIndex(0), (void*)tracklets[0]
719 , t.GetTrackletIndex(1), (void*)tracklets[1]
720 , t.GetTrackletIndex(2), (void*)tracklets[2]
721 , t.GetTrackletIndex(3), (void*)tracklets[3]
722 , t.GetTrackletIndex(4), (void*)tracklets[4]
723 , t.GetTrackletIndex(5), (void*)tracklets[5]));
e3cf3d02 724
053767a4 725 // Loop through the TRD layers
4d6aee34 726 TGeoHMatrix *matrix = NULL;
eb2b4f91 727 Double_t x, y, z;
68f9b6bd 728 for (Int_t ily=startLayer, sm=-1, stk=-1, det=-1; ily < AliTRDgeometry::kNlayer; ily++) {
1bd708e3 729 AliDebug(2, Form("Propagate to x[%d] = %7.2f", ily, fR[ily]));
730
eb2b4f91 731 // rough estimate of the entry point
732 if (!t.GetProlongation(fR[ily], y, z)){
733 n=-1;
734 t.SetStatus(AliTRDtrackV1::kProlongation);
1bd708e3 735 AliDebug(4, Form("Failed Rough Prolongation to ly[%d] x[%7.2f] y[%7.2f] z[%7.2f]", ily, fR[ily], y, z));
eb2b4f91 736 break;
737 }
41702fec 738
eb2b4f91 739 // find sector / stack / detector
740 sm = t.GetSector();
741 // TODO cross check with y value !
742 stk = fGeom->GetStack(z, ily);
743 det = stk>=0 ? AliTRDgeometry::GetDetector(ily, stk, sm) : -1;
4d6aee34 744 matrix = det>=0 ? fGeom->GetClusterMatrix(det) : NULL;
1bd708e3 745 AliDebug(3, Form("Propagate to det[%3d]", det));
eb2b4f91 746
747 // check if supermodule/chamber is installed
748 if( !fGeom->GetSMstatus(sm) ||
749 stk<0. ||
750 fGeom->IsHole(ily, stk, sm) ||
751 !matrix ){
1bd708e3 752 AliDebug(4, Form("Missing Geometry ly[%d]. Guess radial position", ily));
eb2b4f91 753 // propagate to the default radial position
754 if(fR[ily] > (fgkMaxStep + t.GetX()) && !PropagateToX(t, fR[ily], fgkMaxStep)){
755 n=-1;
756 t.SetStatus(AliTRDtrackV1::kPropagation);
1bd708e3 757 AliDebug(4, "Failed Propagation [Missing Geometry]");
41702fec 758 break;
759 }
eb2b4f91 760 if(!AdjustSector(&t)){
761 n=-1;
762 t.SetStatus(AliTRDtrackV1::kAdjustSector);
1bd708e3 763 AliDebug(4, "Failed Adjust Sector [Missing Geometry]");
eb2b4f91 764 break;
765 }
766 if(TMath::Abs(t.GetSnp()) > fgkMaxSnp){
767 n=-1;
768 t.SetStatus(AliTRDtrackV1::kSnp);
1bd708e3 769 AliDebug(4, "Failed Max Snp [Missing Geometry]");
eb2b4f91 770 break;
771 }
772 t.SetStatus(AliTRDtrackV1::kGeometry, ily);
41702fec 773 continue;
774 }
e3cf3d02 775
eb2b4f91 776 // retrieve rotation matrix for the current chamber
777 Double_t loc[] = {AliTRDgeometry::AnodePos()- driftLength, 0., 0.};
778 Double_t glb[] = {0., 0., 0.};
779 matrix->LocalToMaster(loc, glb);
780
781 // Propagate to the radial distance of the current layer
782 x = glb[0] - fgkMaxStep;
783 if(x > (fgkMaxStep + t.GetX()) && !PropagateToX(t, x, fgkMaxStep)){
784 n=-1;
785 t.SetStatus(AliTRDtrackV1::kPropagation);
1bd708e3 786 AliDebug(4, Form("Failed Initial Propagation to x[%7.2f]", x));
eb2b4f91 787 break;
788 }
789 if(!AdjustSector(&t)){
790 n=-1;
791 t.SetStatus(AliTRDtrackV1::kAdjustSector);
1bd708e3 792 AliDebug(4, "Failed Adjust Sector Start");
eb2b4f91 793 break;
794 }
795 if(TMath::Abs(t.GetSnp()) > fgkMaxSnp) {
796 n=-1;
797 t.SetStatus(AliTRDtrackV1::kSnp);
1bd708e3 798 AliDebug(4, Form("Failed Max Snp[%f] MaxSnp[%f]", t.GetSnp(), fgkMaxSnp));
eb2b4f91 799 break;
800 }
4d6aee34 801 Bool_t doRecalculate = kFALSE;
eb2b4f91 802 if(sm != t.GetSector()){
803 sm = t.GetSector();
4d6aee34 804 doRecalculate = kTRUE;
eb2b4f91 805 }
806 if(stk != fGeom->GetStack(z, ily)){
807 stk = fGeom->GetStack(z, ily);
4d6aee34 808 doRecalculate = kTRUE;
eb2b4f91 809 }
4d6aee34 810 if(doRecalculate){
eb2b4f91 811 det = AliTRDgeometry::GetDetector(ily, stk, sm);
812 if(!(matrix = fGeom->GetClusterMatrix(det))){
813 t.SetStatus(AliTRDtrackV1::kGeometry, ily);
1bd708e3 814 AliDebug(4, Form("Failed Geometry Matrix ly[%d]", ily));
eb2b4f91 815 continue;
816 }
817 matrix->LocalToMaster(loc, glb);
818 x = glb[0] - fgkMaxStep;
819 }
820
821 // check if track is well inside fiducial volume
822 if (!t.GetProlongation(x+fgkMaxStep, y, z)) {
823 n=-1;
824 t.SetStatus(AliTRDtrackV1::kProlongation);
1bd708e3 825 AliDebug(4, Form("Failed Prolongation to x[%7.2f] y[%7.2f] z[%7.2f]", x+fgkMaxStep, y, z));
eb2b4f91 826 break;
827 }
828 if(fGeom->IsOnBoundary(det, y, z, .5)){
829 t.SetStatus(AliTRDtrackV1::kBoundary, ily);
1bd708e3 830 AliDebug(4, "Failed Track on Boundary");
eb2b4f91 831 continue;
832 }
833 // mark track as entering the FIDUCIAL volume of TRD
e3cf3d02 834 if(kStoreIn){
a310e49b 835 t.SetTrackIn();
e3cf3d02 836 kStoreIn = kFALSE;
837 }
b1957d3c 838
eb2b4f91 839 ptrTracklet = tracklets[ily];
840 if(!ptrTracklet){ // BUILD TRACKLET
1bd708e3 841 AliDebug(3, Form("Building tracklet det[%d]", det));
eb2b4f91 842 // check data in supermodule
843 if(!fTrSec[sm].GetNChambers()){
844 t.SetStatus(AliTRDtrackV1::kNoClusters, ily);
1bd708e3 845 AliDebug(4, "Failed NoClusters");
eb2b4f91 846 continue;
847 }
848 if(fTrSec[sm].GetX(ily) < 1.){
849 t.SetStatus(AliTRDtrackV1::kNoClusters, ily);
1bd708e3 850 AliDebug(4, "Failed NoX");
eb2b4f91 851 continue;
852 }
853
854 // check data in chamber
855 if(!(chamber = fTrSec[sm].GetChamber(stk, ily))){
856 t.SetStatus(AliTRDtrackV1::kNoClusters, ily);
1bd708e3 857 AliDebug(4, "Failed No Detector");
eb2b4f91 858 continue;
859 }
9e85cb05 860 if(chamber->GetNClusters() < fgNTimeBins*fkRecoParam ->GetFindableClusters()){
eb2b4f91 861 t.SetStatus(AliTRDtrackV1::kNoClusters, ily);
1bd708e3 862 AliDebug(4, "Failed Not Enough Clusters in Detector");
eb2b4f91 863 continue;
864 }
865 // build tracklet
866 ptrTracklet = new(&tracklet) AliTRDseedV1(det);
4d6aee34 867 ptrTracklet->SetReconstructor(fkReconstructor);
eb2b4f91 868 ptrTracklet->SetKink(t.IsKink());
869 ptrTracklet->SetPadPlane(fGeom->GetPadPlane(ily, stk));
870 ptrTracklet->SetX0(glb[0]+driftLength);
871 if(!tracklet.Init(&t)){
872 n=-1;
873 t.SetStatus(AliTRDtrackV1::kTrackletInit);
1bd708e3 874 AliDebug(4, "Failed Tracklet Init");
eb2b4f91 875 break;
876 }
877 if(!tracklet.AttachClusters(chamber, kTRUE)){
878 t.SetStatus(AliTRDtrackV1::kNoAttach, ily);
7c3eecb8 879 if(debugLevel>3){
880 AliTRDseedV1 trackletCp(*ptrTracklet);
881 UChar_t status(t.GetStatusTRD(ily));
882 (*cstreamer) << "FollowBackProlongation2"
883 <<"status=" << status
884 <<"tracklet.=" << &trackletCp
885 << "\n";
886 }
1bd708e3 887 AliDebug(4, "Failed Attach Clusters");
eb2b4f91 888 continue;
889 }
1bd708e3 890 AliDebug(3, Form("Number of Clusters in Tracklet: %d", tracklet.GetN()));
9e85cb05 891 if(tracklet.GetN() < fgNTimeBins*fkRecoParam ->GetFindableClusters()){
eb2b4f91 892 t.SetStatus(AliTRDtrackV1::kNoClustersTracklet, ily);
7c3eecb8 893 if(debugLevel>3){
894 AliTRDseedV1 trackletCp(*ptrTracklet);
895 UChar_t status(t.GetStatusTRD(ily));
896 (*cstreamer) << "FollowBackProlongation2"
897 <<"status=" << status
898 <<"tracklet.=" << &trackletCp
899 << "\n";
900 }
1bd708e3 901 AliDebug(4, "Failed N Clusters Attached");
eb2b4f91 902 continue;
903 }
904 ptrTracklet->UpdateUsed();
0217fcd0 905 } else AliDebug(2, Form("Use external tracklet ly[%d]", ily));
eb2b4f91 906 // propagate track to the radial position of the tracklet
68f9b6bd 907
eb2b4f91 908 // fit tracklet no tilt correction
909 if(!ptrTracklet->Fit(kFALSE)){
910 t.SetStatus(AliTRDtrackV1::kNoFit, ily);
1bd708e3 911 AliDebug(4, "Failed Tracklet Fit");
eb2b4f91 912 continue;
913 }
914 x = ptrTracklet->GetX(); //GetX0();
915 if(x > (fgkMaxStep + t.GetX()) && !PropagateToX(t, x, fgkMaxStep)) {
916 n=-1;
917 t.SetStatus(AliTRDtrackV1::kPropagation);
1bd708e3 918 AliDebug(4, Form("Failed Propagation to Tracklet x[%7.2f]", x));
eb2b4f91 919 break;
920 }
921 if(!AdjustSector(&t)) {
922 n=-1;
923 t.SetStatus(AliTRDtrackV1::kAdjustSector);
1bd708e3 924 AliDebug(4, "Failed Adjust Sector");
eb2b4f91 925 break;
41702fec 926 }
eb2b4f91 927 if(TMath::Abs(t.GetSnp()) > fgkMaxSnp) {
928 n=-1;
929 t.SetStatus(AliTRDtrackV1::kSnp);
1bd708e3 930 AliDebug(4, Form("Failed Max Snp[%f] MaxSnp[%f]", t.GetSnp(), fgkMaxSnp));
eb2b4f91 931 break;
932 }
81a6494d 933 if(kPropagateIn){
a310e49b 934 t.SetTrackIn();
81a6494d 935 kPropagateIn = kFALSE;
936 }
b72f4eaf 937 Double_t cov[3]; ptrTracklet->GetCovAt(x, cov);
938 Double_t p[2] = { ptrTracklet->GetY(), ptrTracklet->GetZ()};
939 Double_t chi2 = ((AliExternalTrackParam)t).GetPredictedChi2(p, cov);
6e39bde4 940 // update Kalman with the TRD measurement
b72f4eaf 941 if(chi2>1e+10){ // TODO
eb2b4f91 942 t.SetStatus(AliTRDtrackV1::kChi2, ily);
7c3eecb8 943 if(debugLevel > 2){
944 UChar_t status(t.GetStatusTRD());
945 AliTRDseedV1 trackletCp(*ptrTracklet);
946 AliTRDtrackV1 trackCp(t);
947 trackCp.SetOwner();
948 (*cstreamer) << "FollowBackProlongation1"
949 << "status=" << status
950 << "tracklet.=" << &trackletCp
951 << "track.=" << &trackCp
952 << "\n";
953 }
1bd708e3 954 AliDebug(4, Form("Failed Chi2[%f]", chi2));
eb2b4f91 955 continue;
956 }
b06a50a5 957 if(!t.Update(p, cov, chi2, kUseTRD)) {
eb2b4f91 958 n=-1;
959 t.SetStatus(AliTRDtrackV1::kUpdate);
7c3eecb8 960 if(debugLevel > 2){
961 UChar_t status(t.GetStatusTRD());
962 AliTRDseedV1 trackletCp(*ptrTracklet);
963 AliTRDtrackV1 trackCp(t);
964 trackCp.SetOwner();
965 (*cstreamer) << "FollowBackProlongation1"
966 << "status=" << status
967 << "tracklet.=" << &trackletCp
968 << "track.=" << &trackCp
969 << "\n";
970 }
1bd708e3 971 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]));
eb2b4f91 972 break;
973 }
68f9b6bd 974 if(!kStandAlone) ptrTracklet->UseClusters();
b72f4eaf 975 // fill residuals ?!
976 AliTracker::FillResiduals(&t, p, cov, ptrTracklet->GetVolumeId());
977
eb2b4f91 978
979 // load tracklet to the tracker
16cca13f 980 ptrTracklet->Update(&t);
eb2b4f91 981 ptrTracklet = SetTracklet(ptrTracklet);
17896e82 982 Int_t index(fTracklets->GetEntriesFast()-1);
983 t.SetTracklet(ptrTracklet, index);
eb2b4f91 984 n += ptrTracklet->GetN();
17896e82 985 AliDebug(2, Form("Setting Tracklet[%d] @ Idx[%d]", ily, index));
eb2b4f91 986
41702fec 987 // Reset material budget if 2 consecutive gold
eb2b4f91 988// if(ilayer>0 && t.GetTracklet(ilayer-1) && ptrTracklet->GetN() + t.GetTracklet(ilayer-1)->GetN() > 20) t.SetBudget(2, 0.);
41702fec 989
990 // Make backup of the track until is gold
b453ef55 991 Int_t failed(0);
68f9b6bd 992 if(!kStandAlone && (failed = t.MakeBackupTrack())) AliDebug(2, Form("Failed backup on cut[%d]", failed));
9e85cb05 993
053767a4 994 } // end layers loop
eb2b4f91 995 //printf("clusters[%d] chi2[%f] x[%f] status[%d ", n, t.GetChi2(), t.GetX(), t.GetStatusTRD());
996 //for(int i=0; i<6; i++) printf("%d ", t.GetStatusTRD(i)); printf("]\n");
41702fec 997
7c3eecb8 998 if(debugLevel > 1){
41702fec 999 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
eb2b4f91 1000 AliTRDtrackV1 track(t);
1001 track.SetOwner();
7c3eecb8 1002 (*cstreamer) << "FollowBackProlongation0"
eb2b4f91 1003 << "EventNumber=" << eventNumber
1004 << "ncl=" << n
1005 << "track.=" << &track
41702fec 1006 << "\n";
1007 }
1008
eb2b4f91 1009 return n;
0906e73e 1010}
1011
eb38ed55 1012//_________________________________________________________________________
4d6aee34 1013Float_t AliTRDtrackerV1::FitRieman(AliTRDseedV1 *tracklets, Double_t *chi2, Int_t *const planes){
41702fec 1014 //
1015 // Fits a Riemann-circle to the given points without tilting pad correction.
1016 // The fit is performed using an instance of the class AliRieman (equations
1017 // and transformations see documentation of this class)
1018 // Afterwards all the tracklets are Updated
1019 //
1020 // Parameters: - Array of tracklets (AliTRDseedV1)
1021 // - Storage for the chi2 values (beginning with direction z)
1022 // - Seeding configuration
1023 // Output: - The curvature
1024 //
1025 AliRieman *fitter = AliTRDtrackerV1::GetRiemanFitter();
1026 fitter->Reset();
1027 Int_t allplanes[] = {0, 1, 2, 3, 4, 5};
1028 Int_t *ppl = &allplanes[0];
1029 Int_t maxLayers = 6;
1030 if(planes){
1031 maxLayers = 4;
1032 ppl = planes;
1033 }
1034 for(Int_t il = 0; il < maxLayers; il++){
1035 if(!tracklets[ppl[il]].IsOK()) continue;
e3cf3d02 1036 fitter->AddPoint(tracklets[ppl[il]].GetX0(), tracklets[ppl[il]].GetYfit(0), tracklets[ppl[il]].GetZfit(0),1,10);
41702fec 1037 }
1038 fitter->Update();
1039 // Set the reference position of the fit and calculate the chi2 values
1040 memset(chi2, 0, sizeof(Double_t) * 2);
1041 for(Int_t il = 0; il < maxLayers; il++){
1042 // Reference positions
1043 tracklets[ppl[il]].Init(fitter);
1044
1045 // chi2
1046 if((!tracklets[ppl[il]].IsOK()) && (!planes)) continue;
1047 chi2[0] += tracklets[ppl[il]].GetChi2Y();
1048 chi2[1] += tracklets[ppl[il]].GetChi2Z();
1049 }
1050 return fitter->GetC();
eb38ed55 1051}
1052
1053//_________________________________________________________________________
1054void AliTRDtrackerV1::FitRieman(AliTRDcluster **seedcl, Double_t chi2[2])
1055{
41702fec 1056 //
1057 // Performs a Riemann helix fit using the seedclusters as spacepoints
1058 // Afterwards the chi2 values are calculated and the seeds are updated
1059 //
1060 // Parameters: - The four seedclusters
1061 // - The tracklet array (AliTRDseedV1)
1062 // - The seeding configuration
1063 // - Chi2 array
1064 //
1065 // debug level 2
1066 //
1067 AliRieman *fitter = AliTRDtrackerV1::GetRiemanFitter();
1068 fitter->Reset();
a3743898 1069 for(Int_t i = 0; i < 4; i++){
a3743898 1070 fitter->AddPoint(seedcl[i]->GetX(), seedcl[i]->GetY(), seedcl[i]->GetZ(), 1., 10.);
1071 }
41702fec 1072 fitter->Update();
1073
1074
1075 // Update the seed and calculated the chi2 value
1076 chi2[0] = 0; chi2[1] = 0;
1077 for(Int_t ipl = 0; ipl < kNSeedPlanes; ipl++){
1078 // chi2
1079 chi2[0] += (seedcl[ipl]->GetZ() - fitter->GetZat(seedcl[ipl]->GetX())) * (seedcl[ipl]->GetZ() - fitter->GetZat(seedcl[ipl]->GetX()));
1080 chi2[1] += (seedcl[ipl]->GetY() - fitter->GetYat(seedcl[ipl]->GetX())) * (seedcl[ipl]->GetY() - fitter->GetYat(seedcl[ipl]->GetX()));
1081 }
eb38ed55 1082}
1083
1084
1085//_________________________________________________________________________
1086Float_t AliTRDtrackerV1::FitTiltedRiemanConstraint(AliTRDseedV1 *tracklets, Double_t zVertex)
1087{
41702fec 1088 //
1089 // Fits a helix to the clusters. Pad tilting is considered. As constraint it is
1090 // assumed that the vertex position is set to 0.
1091 // This method is very usefull for high-pt particles
1092 // Basis for the fit: (x - x0)^2 + (y - y0)^2 - R^2 = 0
1093 // x0, y0: Center of the circle
1094 // Measured y-position: ymeas = y - tan(phiT)(zc - zt)
1095 // zc: center of the pad row
1096 // Equation which has to be fitted (after transformation):
1097 // a + b * u + e * v + 2*(ymeas + tan(phiT)(z - zVertex))*t = 0
1098 // Transformation:
1099 // t = 1/(x^2 + y^2)
1100 // u = 2 * x * t
1101 // v = 2 * x * tan(phiT) * t
1102 // Parameters in the equation:
1103 // a = -1/y0, b = x0/y0, e = dz/dx
1104 //
1105 // The Curvature is calculated by the following equation:
1106 // - curv = a/Sqrt(b^2 + 1) = 1/R
1107 // Parameters: - the 6 tracklets
1108 // - the Vertex constraint
1109 // Output: - the Chi2 value of the track
1110 //
1111 // debug level 5
1112 //
1113
1114 TLinearFitter *fitter = GetTiltedRiemanFitterConstraint();
1115 fitter->StoreData(kTRUE);
1116 fitter->ClearPoints();
4d6aee34 1117 AliTRDcluster *cl = NULL;
41702fec 1118
1119 Float_t x, y, z, w, t, error, tilt;
1120 Double_t uvt[2];
1121 Int_t nPoints = 0;
053767a4 1122 for(Int_t ilr = 0; ilr < AliTRDgeometry::kNlayer; ilr++){
1123 if(!tracklets[ilr].IsOK()) continue;
8d2bec9e 1124 for(Int_t itb = 0; itb < AliTRDseedV1::kNclusters; itb++){
053767a4 1125 if(!tracklets[ilr].IsUsable(itb)) continue;
1126 cl = tracklets[ilr].GetClusters(itb);
1742f24c 1127 if(!cl->IsInChamber()) continue;
c79857d5 1128 if(cl->GetSigmaY2()<1.e-6 || cl->GetSigmaZ2()<1.e-6){
1129 if(AliLog::GetDebugLevel("TRD", "AliTRDtrackerV1")>1) printf("D-AliTRDtrackerV1::FitTiltedRiemanConstraint: Cluster error parameterization missing. This should appear only in HLT tests.");
1130 continue;
1131 }
41702fec 1132 x = cl->GetX();
1133 y = cl->GetY();
1134 z = cl->GetZ();
053767a4 1135 tilt = tracklets[ilr].GetTilt();
41702fec 1136 // Transformation
1137 t = 1./(x * x + y * y);
1138 uvt[0] = 2. * x * t;
1139 uvt[1] = 2. * x * t * tilt ;
1140 w = 2. * (y + tilt * (z - zVertex)) * t;
78b7d24c 1141 error = 2. * TMath::Sqrt(cl->GetSigmaY2()+tilt*tilt*cl->GetSigmaZ2()) * t;
41702fec 1142 fitter->AddPoint(uvt, w, error);
1143 nPoints++;
1144 }
1145 }
e17f4785 1146 fitter->Eval();
41702fec 1147
1148 // Calculate curvature
1149 Double_t a = fitter->GetParameter(0);
1150 Double_t b = fitter->GetParameter(1);
1151 Double_t curvature = a/TMath::Sqrt(b*b + 1);
1152
1153 Float_t chi2track = fitter->GetChisquare()/Double_t(nPoints);
1154 for(Int_t ip = 0; ip < AliTRDtrackerV1::kNPlanes; ip++)
68f9b6bd 1155 tracklets[ip].SetC(curvature, 1);
1156
1157 if(AliLog::GetDebugLevel("TRD", "AliTRDtrackerV1")>3) printf("D-AliTRDtrackerV1::FitTiltedRiemanConstraint: Chi2[%f] C[%5.2e] pt[%8.3f]\n", chi2track, curvature, GetBz()*kB2C/curvature);
41702fec 1158
a2fbb6ec 1159/* if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker()) >= 5){
41702fec 1160 //Linear Model on z-direction
1161 Double_t xref = CalculateReferenceX(tracklets); // Relative to the middle of the stack
1162 Double_t slope = fitter->GetParameter(2);
1163 Double_t zref = slope * xref;
1164 Float_t chi2Z = CalculateChi2Z(tracklets, zref, slope, xref);
1165 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
1166 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
4d6aee34 1167 TTreeSRedirector &treeStreamer = *fkReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
41702fec 1168 treeStreamer << "FitTiltedRiemanConstraint"
1169 << "EventNumber=" << eventNumber
1170 << "CandidateNumber=" << candidateNumber
1171 << "Curvature=" << curvature
1172 << "Chi2Track=" << chi2track
1173 << "Chi2Z=" << chi2Z
1174 << "zref=" << zref
1175 << "\n";
3a039a31 1176 }*/
41702fec 1177 return chi2track;
eb38ed55 1178}
1179
1180//_________________________________________________________________________
1181Float_t AliTRDtrackerV1::FitTiltedRieman(AliTRDseedV1 *tracklets, Bool_t sigError)
1182{
41702fec 1183 //
1184 // Performs a Riemann fit taking tilting pad correction into account
1185 // The equation of a Riemann circle, where the y position is substituted by the
1186 // measured y-position taking pad tilting into account, has to be transformed
1187 // into a 4-dimensional hyperplane equation
1188 // Riemann circle: (x-x0)^2 + (y-y0)^2 -R^2 = 0
1189 // Measured y-Position: ymeas = y - tan(phiT)(zc - zt)
1190 // zc: center of the pad row
1191 // zt: z-position of the track
1192 // The z-position of the track is assumed to be linear dependent on the x-position
1193 // Transformed equation: a + b * u + c * t + d * v + e * w - 2 * (ymeas + tan(phiT) * zc) * t = 0
1194 // Transformation: u = 2 * x * t
1195 // v = 2 * tan(phiT) * t
1196 // w = 2 * tan(phiT) * (x - xref) * t
1197 // t = 1 / (x^2 + ymeas^2)
1198 // Parameters: a = -1/y0
1199 // b = x0/y0
1200 // c = (R^2 -x0^2 - y0^2)/y0
1201 // d = offset
1202 // e = dz/dx
1203 // If the offset respectively the slope in z-position is impossible, the parameters are fixed using
1204 // results from the simple riemann fit. Afterwards the fit is redone.
1205 // The curvature is calculated according to the formula:
1206 // curv = a/(1 + b^2 + c*a) = 1/R
1207 //
1208 // Paramters: - Array of tracklets (connected to the track candidate)
1209 // - Flag selecting the error definition
1210 // Output: - Chi2 values of the track (in Parameter list)
1211 //
1212 TLinearFitter *fitter = GetTiltedRiemanFitter();
1213 fitter->StoreData(kTRUE);
1214 fitter->ClearPoints();
1215 AliTRDLeastSquare zfitter;
4d6aee34 1216 AliTRDcluster *cl = NULL;
41702fec 1217
1218 Double_t xref = CalculateReferenceX(tracklets);
6e39bde4 1219 Double_t x, y, z, t, tilt, dx, w, we, erry, errz;
1220 Double_t uvt[4], sumPolY[5], sumPolZ[3];
1221 memset(sumPolY, 0, sizeof(Double_t) * 5);
1222 memset(sumPolZ, 0, sizeof(Double_t) * 3);
41702fec 1223 Int_t nPoints = 0;
1224 // Containers for Least-square fitter
1225 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1226 if(!tracklets[ipl].IsOK()) continue;
ed15ef4f 1227 tilt = tracklets[ipl].GetTilt();
8d2bec9e 1228 for(Int_t itb = 0; itb < AliTRDseedV1::kNclusters; itb++){
41702fec 1229 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1742f24c 1230 if(!cl->IsInChamber()) continue;
c79857d5 1231 if (!tracklets[ipl].IsUsable(itb)) continue;
41702fec 1232 x = cl->GetX();
1233 y = cl->GetY();
1234 z = cl->GetZ();
c79857d5 1235 if(cl->GetSigmaY2()<1.e-6 || cl->GetSigmaZ2()<1.e-6){
1236 if(AliLog::GetDebugLevel("TRD", "AliTRDtrackerV1")>1) printf("D-AliTRDtrackerV1::FitTiltedRieman: Cluster error parameterization missing. This should appear only in HLT tests.");
1237 tracklets[ipl].Print("a");
1238 continue;
1239 }
41702fec 1240 dx = x - xref;
1241 // Transformation
1242 t = 1./(x*x + y*y);
1243 uvt[0] = 2. * x * t;
1244 uvt[1] = t;
1245 uvt[2] = 2. * tilt * t;
1246 uvt[3] = 2. * tilt * dx * t;
1247 w = 2. * (y + tilt*z) * t;
1248 // error definition changes for the different calls
1249 we = 2. * t;
78b7d24c 1250 we *= sigError ? TMath::Sqrt(cl->GetSigmaY2()+tilt*tilt*cl->GetSigmaZ2()) : 0.2;
41702fec 1251 fitter->AddPoint(uvt, w, we);
1252 zfitter.AddPoint(&x, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
6e39bde4 1253 // adding points for covariance matrix estimation
1254 erry = 1./(TMath::Sqrt(cl->GetSigmaY2()) + 0.1); // 0.1 is a systematic error (due to misalignment and miscalibration)
1255 erry *= erry;
1256 errz = 1./cl->GetSigmaZ2();
1257 for(Int_t ipol = 0; ipol < 5; ipol++){
1258 sumPolY[ipol] += erry;
1259 erry *= x;
1260 if(ipol < 3){
1261 sumPolZ[ipol] += errz;
1262 errz *= x;
1263 }
1264 }
41702fec 1265 nPoints++;
1266 }
1267 }
e17f4785 1268 fitter->Eval();
41702fec 1269 zfitter.Eval();
1270
1271 Double_t offset = fitter->GetParameter(3);
1272 Double_t slope = fitter->GetParameter(4);
1273
1274 // Linear fitter - not possible to make boundaries
1275 // Do not accept non possible z and dzdx combinations
1276 Bool_t acceptablez = kTRUE;
1277 Double_t zref = 0.0;
1278 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
1279 if(!tracklets[iLayer].IsOK()) continue;
1280 zref = offset + slope * (tracklets[iLayer].GetX0() - xref);
e3cf3d02 1281 if (TMath::Abs(tracklets[iLayer].GetZfit(0) - zref) > tracklets[iLayer].GetPadLength() * 0.5 + 1.0)
41702fec 1282 acceptablez = kFALSE;
1283 }
1284 if (!acceptablez) {
1285 Double_t dzmf = zfitter.GetFunctionParameter(1);
1286 Double_t zmf = zfitter.GetFunctionValue(&xref);
1287 fgTiltedRieman->FixParameter(3, zmf);
1288 fgTiltedRieman->FixParameter(4, dzmf);
e17f4785 1289 fitter->Eval();
41702fec 1290 fitter->ReleaseParameter(3);
1291 fitter->ReleaseParameter(4);
1292 offset = fitter->GetParameter(3);
1293 slope = fitter->GetParameter(4);
1294 }
1295
1296 // Calculate Curvarture
1297 Double_t a = fitter->GetParameter(0);
1298 Double_t b = fitter->GetParameter(1);
1299 Double_t c = fitter->GetParameter(2);
1300 Double_t curvature = 1.0 + b*b - c*a;
68f9b6bd 1301 if (curvature > 0.0) curvature = a / TMath::Sqrt(curvature);
41702fec 1302
1303 Double_t chi2track = fitter->GetChisquare()/Double_t(nPoints);
1304
6e39bde4 1305 // Prepare error calculation
1306 TMatrixD covarPolY(3,3);
1307 covarPolY(0,0) = sumPolY[0]; covarPolY(1,1) = sumPolY[2]; covarPolY(2,2) = sumPolY[4];
1308 covarPolY(0,1) = covarPolY(1,0) = sumPolY[1];
1309 covarPolY(0,2) = covarPolY(2,0) = sumPolY[2];
1310 covarPolY(2,1) = covarPolY(1,2) = sumPolY[3];
1311 covarPolY.Invert();
1312 TMatrixD covarPolZ(2,2);
1313 covarPolZ(0,0) = sumPolZ[0]; covarPolZ(1,1) = sumPolZ[2];
1314 covarPolZ(1,0) = covarPolZ(0,1) = sumPolZ[1];
1315 covarPolZ.Invert();
1316
41702fec 1317 // Update the tracklets
6e39bde4 1318 Double_t x1, dy, dz;
1319 Double_t cov[15];
1320 memset(cov, 0, sizeof(Double_t) * 15);
41702fec 1321 for(Int_t iLayer = 0; iLayer < AliTRDtrackerV1::kNPlanes; iLayer++) {
1322
1323 x = tracklets[iLayer].GetX0();
6e39bde4 1324 x1 = x - xref;
41702fec 1325 y = 0;
1326 z = 0;
1327 dy = 0;
1328 dz = 0;
6e39bde4 1329 memset(cov, 0, sizeof(Double_t) * 3);
1330 TMatrixD transform(3,3);
1331 transform(0,0) = 1;
1332 transform(0,1) = x;
1333 transform(0,2) = x*x;
1334 transform(1,1) = 1;
1335 transform(1,2) = x;
1336 transform(2,2) = 1;
1337 TMatrixD covariance(transform, TMatrixD::kMult, covarPolY);
1338 covariance *= transform.T();
1339 TMatrixD transformZ(2,2);
1340 transformZ(0,0) = transformZ(1,1) = 1;
1341 transformZ(0,1) = x;
1342 TMatrixD covarZ(transformZ, TMatrixD::kMult, covarPolZ);
1343 covarZ *= transformZ.T();
41702fec 1344 // y: R^2 = (x - x0)^2 + (y - y0)^2
1345 // => y = y0 +/- Sqrt(R^2 - (x - x0)^2)
1346 // R = Sqrt() = 1/Curvature
1347 // => y = y0 +/- Sqrt(1/Curvature^2 - (x - x0)^2)
1348 Double_t res = (x * a + b); // = (x - x0)/y0
1349 res *= res;
1350 res = 1.0 - c * a + b * b - res; // = (R^2 - (x - x0)^2)/y0^2
1351 if (res >= 0) {
1352 res = TMath::Sqrt(res);
1353 y = (1.0 - res) / a;
1354 }
6e39bde4 1355 cov[0] = covariance(0,0);
1356 cov[2] = covarZ(0,0);
1357 cov[1] = 0.;
41702fec 1358
1359 // dy: R^2 = (x - x0)^2 + (y - y0)^2
1360 // => y = +/- Sqrt(R^2 - (x - x0)^2) + y0
1361 // => dy/dx = (x - x0)/Sqrt(R^2 - (x - x0)^2)
1362 // Curvature: cr = 1/R = a/Sqrt(1 + b^2 - c*a)
1363 // => dy/dx = (x - x0)/(1/(cr^2) - (x - x0)^2)
1364 Double_t x0 = -b / a;
1365 if (-c * a + b * b + 1 > 0) {
1366 if (1.0/(curvature * curvature) - (x - x0) * (x - x0) > 0.0) {
6e39bde4 1367 Double_t yderiv = (x - x0) / TMath::Sqrt(1.0/(curvature * curvature) - (x - x0) * (x - x0));
1368 if (a < 0) yderiv *= -1.0;
1369 dy = yderiv;
41702fec 1370 }
1371 }
1372 z = offset + slope * (x - xref);
1373 dz = slope;
1374 tracklets[iLayer].SetYref(0, y);
1375 tracklets[iLayer].SetYref(1, dy);
1376 tracklets[iLayer].SetZref(0, z);
1377 tracklets[iLayer].SetZref(1, dz);
1378 tracklets[iLayer].SetC(curvature);
6e39bde4 1379 tracklets[iLayer].SetCovRef(cov);
41702fec 1380 tracklets[iLayer].SetChi2(chi2track);
1381 }
68f9b6bd 1382 if(AliLog::GetDebugLevel("TRD", "AliTRDtrackerV1")>3) printf("D-AliTRDtrackerV1::FitTiltedRieman: Chi2[%f] C[%5.2e] pt[%8.3f]\n", chi2track, curvature, GetBz()*kB2C/curvature);
41702fec 1383
a2fbb6ec 1384/* if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) >=5){
1385 TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
41702fec 1386 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
1387 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
1388 Double_t chi2z = CalculateChi2Z(tracklets, offset, slope, xref);
1389 cstreamer << "FitTiltedRieman0"
1390 << "EventNumber=" << eventNumber
1391 << "CandidateNumber=" << candidateNumber
1392 << "xref=" << xref
1393 << "Chi2Z=" << chi2z
1394 << "\n";
3a039a31 1395 }*/
41702fec 1396 return chi2track;
eb38ed55 1397}
1398
3b57a3f7 1399
9e333711 1400//____________________________________________________________________
6e4d4425 1401Double_t AliTRDtrackerV1::FitLine(const AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t err, Int_t np, AliTrackPoint *points)
9e333711 1402{
4d6aee34 1403 //
1404 // Fit track with a staight line
1405 // Fills an AliTrackPoint array with np points
1406 // Function should be used to refit tracks when no magnetic field was on
1407 //
9e333711 1408 AliTRDLeastSquare yfitter, zfitter;
4d6aee34 1409 AliTRDcluster *cl = NULL;
9e333711 1410
4d6aee34 1411 AliTRDseedV1 work[kNPlanes], *tracklet = NULL;
9e333711 1412 if(!tracklets){
1413 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1414 if(!(tracklet = track->GetTracklet(ipl))) continue;
1415 if(!tracklet->IsOK()) continue;
1416 new(&work[ipl]) AliTRDseedV1(*tracklet);
1417 }
1418 tracklets = &work[0];
1419 }
1420
1421 Double_t xref = CalculateReferenceX(tracklets);
1422 Double_t x, y, z, dx, ye, yr, tilt;
1423 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1424 if(!tracklets[ipl].IsOK()) continue;
1425 for(Int_t itb = 0; itb < fgNTimeBins; itb++){
1426 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1427 if (!tracklets[ipl].IsUsable(itb)) continue;
1428 x = cl->GetX();
1429 z = cl->GetZ();
1430 dx = x - xref;
1431 zfitter.AddPoint(&dx, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
1432 }
1433 }
1434 zfitter.Eval();
1435 Double_t z0 = zfitter.GetFunctionParameter(0);
1436 Double_t dzdx = zfitter.GetFunctionParameter(1);
1437 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1438 if(!tracklets[ipl].IsOK()) continue;
1439 for(Int_t itb = 0; itb < fgNTimeBins; itb++){
1440 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1441 if (!tracklets[ipl].IsUsable(itb)) continue;
1442 x = cl->GetX();
1443 y = cl->GetY();
1444 z = cl->GetZ();
1445 tilt = tracklets[ipl].GetTilt();
1446 dx = x - xref;
1447 yr = y + tilt*(z - z0 - dzdx*dx);
1448 // error definition changes for the different calls
1449 ye = tilt*TMath::Sqrt(cl->GetSigmaZ2());
1450 ye += err ? tracklets[ipl].GetSigmaY() : 0.2;
1451 yfitter.AddPoint(&dx, yr, ye);
1452 }
1453 }
1454 yfitter.Eval();
1455 Double_t y0 = yfitter.GetFunctionParameter(0);
1456 Double_t dydx = yfitter.GetFunctionParameter(1);
1457 Double_t chi2 = 0.;//yfitter.GetChisquare()/Double_t(nPoints);
1458
1459 //update track points array
1460 if(np && points){
1461 Float_t xyz[3];
1462 for(int ip=0; ip<np; ip++){
1463 points[ip].GetXYZ(xyz);
1464 xyz[1] = y0 + dydx * (xyz[0] - xref);
1465 xyz[2] = z0 + dzdx * (xyz[0] - xref);
1466 points[ip].SetXYZ(xyz);
1467 }
1468 }
1469 return chi2;
1470}
1471
1472
3b57a3f7 1473//_________________________________________________________________________
6e4d4425 1474Double_t AliTRDtrackerV1::FitRiemanTilt(const AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t sigError, Int_t np, AliTrackPoint *points)
3b57a3f7 1475{
0fa1a8ee 1476//
1477// Performs a Riemann fit taking tilting pad correction into account
1478//
1479// Paramters: - Array of tracklets (connected to the track candidate)
1480// - Flag selecting the error definition
1481// Output: - Chi2 values of the track (in Parameter list)
1482//
1483// The equations which has to be solved simultaneously are:
1484// BEGIN_LATEX
1485// R^{2} = (x-x_{0})^{2} + (y^{*}-y_{0})^{2}
1486// y^{*} = y - tg(h)(z - z_{t})
1487// z_{t} = z_{0}+dzdx*(x-x_{r})
1488// END_LATEX
1489// with (x, y, z) the coordinate of the cluster, (x_0, y_0, z_0) the coordinate of the center of the Riemann circle,
1490// R its radius, x_r a constant refrence radial position in the middle of the TRD stack and dzdx the slope of the
1491// track in the x-z plane. Using the following transformations
1492// BEGIN_LATEX
1493// t = 1 / (x^{2} + y^{2})
1494// u = 2 * x * t
1495// v = 2 * tan(h) * t
1496// w = 2 * tan(h) * (x - x_{r}) * t
1497// END_LATEX
1498// One gets the following linear equation
1499// BEGIN_LATEX
1500// a + b * u + c * t + d * v + e * w = 2 * (y + tg(h) * z) * t
1501// END_LATEX
1502// where the coefficients have the following meaning
1503// BEGIN_LATEX
1504// a = -1/y_{0}
1505// b = x_{0}/y_{0}
1506// c = (R^{2} -x_{0}^{2} - y_{0}^{2})/y_{0}
1507// d = z_{0}
1508// e = dz/dx
1509// END_LATEX
1510// The error calculation for the free term is thus
1511// BEGIN_LATEX
1512// #sigma = 2 * #sqrt{#sigma^{2}_{y} + (tilt corr ...) + tg^{2}(h) * #sigma^{2}_{z}} * t
1513// END_LATEX
1514//
1515// From this simple model one can compute chi^2 estimates and a rough approximation of pt from the curvature according
1516// to the formula:
1517// BEGIN_LATEX
1518// C = 1/R = a/(1 + b^{2} + c*a)
1519// END_LATEX
1520//
1521// Authors
1522// M.Ivanov <M.Ivanov@gsi.de>
1523// A.Bercuci <A.Bercuci@gsi.de>
1524// M.Fasel <M.Fasel@gsi.de>
1525
41702fec 1526 TLinearFitter *fitter = GetTiltedRiemanFitter();
1527 fitter->StoreData(kTRUE);
1528 fitter->ClearPoints();
1529 AliTRDLeastSquare zfitter;
4d6aee34 1530 AliTRDcluster *cl = NULL;
3b57a3f7 1531
4d6aee34 1532 AliTRDseedV1 work[kNPlanes], *tracklet = NULL;
3b57a3f7 1533 if(!tracklets){
1534 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1535 if(!(tracklet = track->GetTracklet(ipl))) continue;
1536 if(!tracklet->IsOK()) continue;
1537 new(&work[ipl]) AliTRDseedV1(*tracklet);
1538 }
1539 tracklets = &work[0];
1540 }
1541
41702fec 1542 Double_t xref = CalculateReferenceX(tracklets);
68f9b6bd 1543 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);
41702fec 1544 Double_t x, y, z, t, tilt, dx, w, we;
1545 Double_t uvt[4];
1546 Int_t nPoints = 0;
1547 // Containers for Least-square fitter
1548 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1549 if(!tracklets[ipl].IsOK()) continue;
8d2bec9e 1550 for(Int_t itb = 0; itb < AliTRDseedV1::kNclusters; itb++){
41702fec 1551 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
352cef8f 1552 //if (!tracklets[ipl].IsUsable(itb)) continue;
41702fec 1553 x = cl->GetX();
1554 y = cl->GetY();
1555 z = cl->GetZ();
1556 tilt = tracklets[ipl].GetTilt();
1557 dx = x - xref;
1558 // Transformation
1559 t = 1./(x*x + y*y);
1560 uvt[0] = 2. * x * t;
1561 uvt[1] = t;
1562 uvt[2] = 2. * tilt * t;
1563 uvt[3] = 2. * tilt * dx * t;
1564 w = 2. * (y + tilt*z) * t;
1565 // error definition changes for the different calls
1566 we = 2. * t;
f29f13a6 1567 we *= sigError ? TMath::Sqrt(cl->GetSigmaY2()) : 0.2;
41702fec 1568 fitter->AddPoint(uvt, w, we);
1569 zfitter.AddPoint(&x, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
1570 nPoints++;
1571 }
1572 }
aec26713 1573 if(fitter->Eval()) return 1.E10;
1574
41702fec 1575 Double_t z0 = fitter->GetParameter(3);
1576 Double_t dzdx = fitter->GetParameter(4);
3b57a3f7 1577
1578
1579 // Linear fitter - not possible to make boundaries
1580 // Do not accept non possible z and dzdx combinations
1581 Bool_t accept = kTRUE;
1582 Double_t zref = 0.0;
1583 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
1584 if(!tracklets[iLayer].IsOK()) continue;
1585 zref = z0 + dzdx * (tracklets[iLayer].GetX0() - xref);
e3cf3d02 1586 if (TMath::Abs(tracklets[iLayer].GetZfit(0) - zref) > tracklets[iLayer].GetPadLength() * 0.5 + 1.0)
3b57a3f7 1587 accept = kFALSE;
1588 }
1589 if (!accept) {
41702fec 1590 zfitter.Eval();
3b57a3f7 1591 Double_t dzmf = zfitter.GetFunctionParameter(1);
1592 Double_t zmf = zfitter.GetFunctionValue(&xref);
1593 fitter->FixParameter(3, zmf);
1594 fitter->FixParameter(4, dzmf);
e17f4785 1595 fitter->Eval();
3b57a3f7 1596 fitter->ReleaseParameter(3);
1597 fitter->ReleaseParameter(4);
1598 z0 = fitter->GetParameter(3); // = zmf ?
1599 dzdx = fitter->GetParameter(4); // = dzmf ?
1600 }
1601
1602 // Calculate Curvature
1603 Double_t a = fitter->GetParameter(0);
1604 Double_t b = fitter->GetParameter(1);
1605 Double_t c = fitter->GetParameter(2);
1606 Double_t y0 = 1. / a;
1607 Double_t x0 = -b * y0;
a015e406 1608 Double_t tmp = y0*y0 + x0*x0 - c*y0;
1609 if(tmp<=0.) return 1.E10;
4d6aee34 1610 Double_t radius = TMath::Sqrt(tmp);
1611 Double_t curvature = 1.0 + b*b - c*a;
1612 if (curvature > 0.0) curvature = a / TMath::Sqrt(curvature);
3b57a3f7 1613
1614 // Calculate chi2 of the fit
1615 Double_t chi2 = fitter->GetChisquare()/Double_t(nPoints);
68f9b6bd 1616 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);
3b57a3f7 1617
1618 // Update the tracklets
1619 if(!track){
1620 for(Int_t ip = 0; ip < kNPlanes; ip++) {
1621 x = tracklets[ip].GetX0();
4d6aee34 1622 tmp = radius*radius-(x-x0)*(x-x0);
a015e406 1623 if(tmp <= 0.) continue;
1624 tmp = TMath::Sqrt(tmp);
3b57a3f7 1625
1626 // y: R^2 = (x - x0)^2 + (y - y0)^2
1627 // => y = y0 +/- Sqrt(R^2 - (x - x0)^2)
1628 tracklets[ip].SetYref(0, y0 - (y0>0.?1.:-1)*tmp);
1629 // => dy/dx = (x - x0)/Sqrt(R^2 - (x - x0)^2)
1630 tracklets[ip].SetYref(1, (x - x0) / tmp);
1631 tracklets[ip].SetZref(0, z0 + dzdx * (x - xref));
1632 tracklets[ip].SetZref(1, dzdx);
4d6aee34 1633 tracklets[ip].SetC(curvature);
3b57a3f7 1634 tracklets[ip].SetChi2(chi2);
1635 }
1636 }
3b57a3f7 1637 //update track points array
1638 if(np && points){
1639 Float_t xyz[3];
1640 for(int ip=0; ip<np; ip++){
1641 points[ip].GetXYZ(xyz);
4d6aee34 1642 xyz[1] = TMath::Abs(xyz[0] - x0) > radius ? 100. : y0 - (y0>0.?1.:-1.)*TMath::Sqrt((radius-(xyz[0]-x0))*(radius+(xyz[0]-x0)));
3b57a3f7 1643 xyz[2] = z0 + dzdx * (xyz[0] - xref);
1644 points[ip].SetXYZ(xyz);
1645 }
1646 }
1647
3b57a3f7 1648 return chi2;
1649}
1650
1651
1bf51039 1652//____________________________________________________________________
e17f4785 1653Double_t AliTRDtrackerV1::FitKalman(AliTRDtrackV1 *track, AliTRDseedV1 * const tracklets, Bool_t up, Int_t np, AliTrackPoint *points)
1bf51039 1654{
1655// Kalman filter implementation for the TRD.
1656// It returns the positions of the fit in the array "points"
1657//
1658// Author : A.Bercuci@gsi.de
1659
3cfaffa4 1660 // printf("Start track @ x[%f]\n", track->GetX());
1bf51039 1661
1662 //prepare marker points along the track
1663 Int_t ip = np ? 0 : 1;
1664 while(ip<np){
1665 if((up?-1:1) * (track->GetX() - points[ip].GetX()) > 0.) break;
1666 //printf("AliTRDtrackerV1::FitKalman() : Skip track marker x[%d] = %7.3f. Before track start ( %7.3f ).\n", ip, points[ip].GetX(), track->GetX());
1667 ip++;
1668 }
1669 //if(points) printf("First marker point @ x[%d] = %f\n", ip, points[ip].GetX());
1670
1671
4d6aee34 1672 AliTRDseedV1 tracklet, *ptrTracklet = NULL;
1bf51039 1673
1674 //Loop through the TRD planes
1675 for (Int_t jplane = 0; jplane < kNPlanes; jplane++) {
1676 // GET TRACKLET OR BUILT IT
1677 Int_t iplane = up ? jplane : kNPlanes - 1 - jplane;
1678 if(tracklets){
e17f4785 1679 if(!(ptrTracklet = &tracklets[iplane])) continue;
1bf51039 1680 }else{
1681 if(!(ptrTracklet = track->GetTracklet(iplane))){
4d6aee34 1682 /*AliTRDtrackerV1 *tracker = NULL;
a2fbb6ec 1683 if(!(tracker = dynamic_cast<AliTRDtrackerV1*>( AliTRDrecoParam:Tracker()))) continue;
1bf51039 1684 ptrTracklet = new(&tracklet) AliTRDseedV1(iplane);
1685 if(!tracker->MakeTracklet(ptrTracklet, track)) */
1686 continue;
1687 }
1688 }
1689 if(!ptrTracklet->IsOK()) continue;
1690
1691 Double_t x = ptrTracklet->GetX0();
1692
1693 while(ip < np){
1694 //don't do anything if next marker is after next update point.
1695 if((up?-1:1) * (points[ip].GetX() - x) - fgkMaxStep < 0) break;
1bf51039 1696 if(((up?-1:1) * (points[ip].GetX() - track->GetX()) < 0) && !PropagateToX(*track, points[ip].GetX(), fgkMaxStep)) return -1.;
1697
1698 Double_t xyz[3]; // should also get the covariance
3cfaffa4 1699 track->GetXYZ(xyz);
1700 track->Global2LocalPosition(xyz, track->GetAlpha());
1701 points[ip].SetXYZ(xyz[0], xyz[1], xyz[2]);
1bf51039 1702 ip++;
1703 }
3cfaffa4 1704 // printf("plane[%d] tracklet[%p] x[%f]\n", iplane, ptrTracklet, x);
1bf51039 1705
3cfaffa4 1706 // Propagate closer to the next update point
1bf51039 1707 if(((up?-1:1) * (x - track->GetX()) + fgkMaxStep < 0) && !PropagateToX(*track, x + (up?-1:1)*fgkMaxStep, fgkMaxStep)) return -1.;
1708
1709 if(!AdjustSector(track)) return -1;
1710 if(TMath::Abs(track->GetSnp()) > fgkMaxSnp) return -1;
1711
1712 //load tracklet to the tracker and the track
1713/* Int_t index;
1714 if((index = FindTracklet(ptrTracklet)) < 0){
1715 ptrTracklet = SetTracklet(&tracklet);
1716 index = fTracklets->GetEntriesFast()-1;
1717 }
1718 track->SetTracklet(ptrTracklet, index);*/
1719
1720
1721 // register tracklet to track with tracklet creation !!
1722 // PropagateBack : loaded tracklet to the tracker and update index
1723 // RefitInward : update index
1724 // MakeTrack : loaded tracklet to the tracker and update index
1725 if(!tracklets) track->SetTracklet(ptrTracklet, -1);
1726
1727
1728 //Calculate the mean material budget along the path inside the chamber
1729 Double_t xyz0[3]; track->GetXYZ(xyz0);
1730 Double_t alpha = track->GetAlpha();
1731 Double_t xyz1[3], y, z;
1732 if(!track->GetProlongation(x, y, z)) return -1;
1733 xyz1[0] = x * TMath::Cos(alpha) - y * TMath::Sin(alpha);
1734 xyz1[1] = +x * TMath::Sin(alpha) + y * TMath::Cos(alpha);
1735 xyz1[2] = z;
fbe11be7 1736 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
1bf51039 1737 Double_t param[7];
3cfaffa4 1738 if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param) <=0.) break;
1bf51039 1739 Double_t xrho = param[0]*param[4]; // density*length
1740 Double_t xx0 = param[1]; // radiation length
1741
1742 //Propagate the track
1743 track->PropagateTo(x, xx0, xrho);
1744 if (!AdjustSector(track)) break;
1745
1746 //Update track
b72f4eaf 1747 Double_t cov[3]; ptrTracklet->GetCovAt(x, cov);
1748 Double_t p[2] = { ptrTracklet->GetY(), ptrTracklet->GetZ()};
1749 Double_t chi2 = ((AliExternalTrackParam*)track)->GetPredictedChi2(p, cov);
1750 if(chi2<1e+10) track->Update(p, cov, chi2);
1bf51039 1751 if(!up) continue;
1752
1753 //Reset material budget if 2 consecutive gold
1754 if(iplane>0 && track->GetTracklet(iplane-1) && ptrTracklet->GetN() + track->GetTracklet(iplane-1)->GetN() > 20) track->SetBudget(2, 0.);
1755 } // end planes loop
1756
1757 // extrapolation
1758 while(ip < np){
1759 if(((up?-1:1) * (points[ip].GetX() - track->GetX()) < 0) && !PropagateToX(*track, points[ip].GetX(), fgkMaxStep)) return -1.;
1760
1761 Double_t xyz[3]; // should also get the covariance
3cfaffa4 1762 track->GetXYZ(xyz);
1763 track->Global2LocalPosition(xyz, track->GetAlpha());
1764 points[ip].SetXYZ(xyz[0], xyz[1], xyz[2]);
1bf51039 1765 ip++;
1766 }
1767
1768 return track->GetChi2();
1769}
3b57a3f7 1770
eb38ed55 1771//_________________________________________________________________________
bb56afff 1772Float_t AliTRDtrackerV1::CalculateChi2Z(AliTRDseedV1 *tracklets, Double_t offset, Double_t slope, Double_t xref)
eb38ed55 1773{
41702fec 1774 //
1775 // Calculates the chi2-value of the track in z-Direction including tilting pad correction.
1776 // A linear dependence on the x-value serves as a model.
1777 // The parameters are related to the tilted Riemann fit.
1778 // Parameters: - Array of tracklets (AliTRDseedV1) related to the track candidate
1779 // - the offset for the reference x
1780 // - the slope
1781 // - the reference x position
1782 // Output: - The Chi2 value of the track in z-Direction
1783 //
1784 Float_t chi2Z = 0, nLayers = 0;
053767a4 1785 for (Int_t iLayer = 0; iLayer < AliTRDgeometry::kNlayer; iLayer++) {
41702fec 1786 if(!tracklets[iLayer].IsOK()) continue;
1787 Double_t z = offset + slope * (tracklets[iLayer].GetX0() - xref);
e3cf3d02 1788 chi2Z += TMath::Abs(tracklets[iLayer].GetZfit(0) - z);
41702fec 1789 nLayers++;
1790 }
1791 chi2Z /= TMath::Max((nLayers - 3.0),1.0);
1792 return chi2Z;
eb38ed55 1793}
1794
bccda319 1795//_____________________________________________________________________________
1796Int_t AliTRDtrackerV1::PropagateToX(AliTRDtrackV1 &t, Double_t xToGo, Double_t maxStep)
1797{
41702fec 1798 //
1799 // Starting from current X-position of track <t> this function
1800 // extrapolates the track up to radial position <xToGo>.
1801 // Returns 1 if track reaches the plane, and 0 otherwise
1802 //
bccda319 1803
41702fec 1804 const Double_t kEpsilon = 0.00001;
bccda319 1805
41702fec 1806 // Current track X-position
1807 Double_t xpos = t.GetX();
bccda319 1808
41702fec 1809 // Direction: inward or outward
1810 Double_t dir = (xpos < xToGo) ? 1.0 : -1.0;
bccda319 1811
41702fec 1812 while (((xToGo - xpos) * dir) > kEpsilon) {
bccda319 1813
41702fec 1814 Double_t xyz0[3];
1815 Double_t xyz1[3];
1816 Double_t param[7];
1817 Double_t x;
1818 Double_t y;
1819 Double_t z;
bccda319 1820
41702fec 1821 // The next step size
1822 Double_t step = dir * TMath::Min(TMath::Abs(xToGo-xpos),maxStep);
bccda319 1823
41702fec 1824 // Get the global position of the starting point
1825 t.GetXYZ(xyz0);
bccda319 1826
41702fec 1827 // X-position after next step
1828 x = xpos + step;
bccda319 1829
41702fec 1830 // Get local Y and Z at the X-position of the next step
3352b455 1831 if(t.GetProlongation(x,y,z)<0) return 0; // No prolongation possible
bccda319 1832
41702fec 1833 // The global position of the end point of this prolongation step
1834 xyz1[0] = x * TMath::Cos(t.GetAlpha()) - y * TMath::Sin(t.GetAlpha());
1835 xyz1[1] = +x * TMath::Sin(t.GetAlpha()) + y * TMath::Cos(t.GetAlpha());
1836 xyz1[2] = z;
bccda319 1837
41702fec 1838 // Calculate the mean material budget between start and
1839 // end point of this prolongation step
83dea92e 1840 if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param)<=0.) return 0;
bccda319 1841
41702fec 1842 // Propagate the track to the X-position after the next step
9c87a076 1843 if (!t.PropagateTo(x, param[1], param[0]*param[4])) return 0;
bccda319 1844
41702fec 1845 // Rotate the track if necessary
1846 AdjustSector(&t);
bccda319 1847
41702fec 1848 // New track X-position
1849 xpos = t.GetX();
bccda319 1850
41702fec 1851 }
bccda319 1852
41702fec 1853 return 1;
bccda319 1854
1855}
1856
eb38ed55 1857
1858//_____________________________________________________________________________
1859Int_t AliTRDtrackerV1::ReadClusters(TClonesArray* &array, TTree *clusterTree) const
1860{
41702fec 1861 //
1862 // Reads AliTRDclusters from the file.
1863 // The names of the cluster tree and branches
1864 // should match the ones used in AliTRDclusterizer::WriteClusters()
1865 //
1866
1867 Int_t nsize = Int_t(clusterTree->GetTotBytes() / (sizeof(AliTRDcluster)));
1868 TObjArray *clusterArray = new TObjArray(nsize+1000);
1869
1870 TBranch *branch = clusterTree->GetBranch("TRDcluster");
1871 if (!branch) {
1872 AliError("Can't get the branch !");
1873 return 1;
1874 }
1875 branch->SetAddress(&clusterArray);
1876
1877 if(!fClusters){
9e85cb05 1878 Float_t nclusters = fkRecoParam->GetNClusters();
4d6aee34 1879 if(fkReconstructor->IsHLT()) nclusters /= AliTRDgeometry::kNsector;
8ae98148 1880 array = new TClonesArray("AliTRDcluster", Int_t(nclusters));
41702fec 1881 array->SetOwner(kTRUE);
1882 }
1883
1884 // Loop through all entries in the tree
1885 Int_t nEntries = (Int_t) clusterTree->GetEntries();
1886 Int_t nbytes = 0;
1887 Int_t ncl = 0;
4d6aee34 1888 AliTRDcluster *c = NULL;
41702fec 1889 for (Int_t iEntry = 0; iEntry < nEntries; iEntry++) {
1890 // Import the tree
1891 nbytes += clusterTree->GetEvent(iEntry);
1892
1893 // Get the number of points in the detector
1894 Int_t nCluster = clusterArray->GetEntriesFast();
1895 for (Int_t iCluster = 0; iCluster < nCluster; iCluster++) {
1896 if(!(c = (AliTRDcluster *) clusterArray->UncheckedAt(iCluster))) continue;
41702fec 1897 new((*fClusters)[ncl++]) AliTRDcluster(*c);
1898 delete (clusterArray->RemoveAt(iCluster));
1899 }
1900
1901 }
1902 delete clusterArray;
1903
1904 return 0;
eb38ed55 1905}
1906
1907//_____________________________________________________________________________
1908Int_t AliTRDtrackerV1::LoadClusters(TTree *cTree)
1909{
41702fec 1910 //
66f6bfd9 1911 // Fills clusters into TRD tracking sectors
41702fec 1912 //
41702fec 1913
9e85cb05 1914 fkRecoParam = fkReconstructor->GetRecoParam(); // load reco param for this event
1915
4d6aee34 1916 if(!fkReconstructor->IsWritingClusters()){
48f8adf3 1917 fClusters = AliTRDReconstructor::GetClusters();
1918 } else {
66f6bfd9 1919 if (ReadClusters(fClusters, cTree)) {
1920 AliError("Problem with reading the clusters !");
1921 return 1;
1922 }
1923 }
1924 SetClustersOwner();
1925
48f8adf3 1926 if(!fClusters || !fClusters->GetEntriesFast()){
66f6bfd9 1927 AliInfo("No TRD clusters");
41702fec 1928 return 1;
1929 }
66f6bfd9 1930
1931 //Int_t nin =
1932 BuildTrackingContainers();
1933
1934 //Int_t ncl = fClusters->GetEntriesFast();
1935 //AliInfo(Form("Clusters %d [%6.2f %% in the active volume]", ncl, 100.*float(nin)/ncl));
1936
1937 return 0;
1938}
1939
1940//_____________________________________________________________________________
4d6aee34 1941Int_t AliTRDtrackerV1::LoadClusters(TClonesArray * const clusters)
66f6bfd9 1942{
1943 //
1944 // Fills clusters into TRD tracking sectors
1945 // Function for use in the HLT
1946
1947 if(!clusters || !clusters->GetEntriesFast()){
1948 AliInfo("No TRD clusters");
41702fec 1949 return 1;
1950 }
1951
66f6bfd9 1952 fClusters = clusters;
1953 SetClustersOwner();
1954
9e85cb05 1955 fkRecoParam = fkReconstructor->GetRecoParam(); // load reco param for this event
66f6bfd9 1956 BuildTrackingContainers();
1957
1958 //Int_t ncl = fClusters->GetEntriesFast();
1959 //AliInfo(Form("Clusters %d [%6.2f %% in the active volume]", ncl, 100.*float(nin)/ncl));
1960
1961 return 0;
1962}
1963
1964
1965//____________________________________________________________________
1966Int_t AliTRDtrackerV1::BuildTrackingContainers()
1967{
1968// Building tracking containers for clusters
1969
c79857d5 1970 Int_t nin(0), ncl(fClusters->GetEntriesFast());
1971 while (ncl--) {
1972 AliTRDcluster *c = (AliTRDcluster *) fClusters->UncheckedAt(ncl);
41702fec 1973 if(c->IsInChamber()) nin++;
4226b195 1974 if(fkReconstructor->IsHLT()) c->SetRPhiMethod(AliTRDcluster::kCOG);
41702fec 1975 Int_t detector = c->GetDetector();
1976 Int_t sector = fGeom->GetSector(detector);
053767a4 1977 Int_t stack = fGeom->GetStack(detector);
1978 Int_t layer = fGeom->GetLayer(detector);
41702fec 1979
c79857d5 1980 fTrSec[sector].GetChamber(stack, layer, kTRUE)->InsertCluster(c, ncl, fkReconstructor->IsHLT());
41702fec 1981 }
b0a48c4d 1982
053767a4 1983 for(int isector =0; isector<AliTRDgeometry::kNsector; isector++){
41702fec 1984 if(!fTrSec[isector].GetNChambers()) continue;
c79857d5 1985 fTrSec[isector].Init(fkReconstructor);
41702fec 1986 }
66f6bfd9 1987
1988 return nin;
eb38ed55 1989}
1990
1991
66f6bfd9 1992
0906e73e 1993//____________________________________________________________________
172b6f82 1994void AliTRDtrackerV1::UnloadClusters()
0906e73e 1995{
d4cf71ca 1996//
1997// Clears the arrays of clusters and tracks. Resets sectors and timebins
1998// If option "force" is also set the containers are also deleted. This is useful
1999// in case of HLT
2000
2001 if(fTracks){
2002 fTracks->Delete();
4d6aee34 2003 if(HasRemoveContainers()){delete fTracks; fTracks = NULL;}
d4cf71ca 2004 }
2005 if(fTracklets){
2006 fTracklets->Delete();
4d6aee34 2007 if(HasRemoveContainers()){delete fTracklets; fTracklets = NULL;}
d4cf71ca 2008 }
48f8adf3 2009 if(fClusters){
2010 if(IsClustersOwner()) fClusters->Delete();
2011
2012 // save clusters array in the reconstructor for further use.
4d6aee34 2013 if(!fkReconstructor->IsWritingClusters()){
48f8adf3 2014 AliTRDReconstructor::SetClusters(fClusters);
2015 SetClustersOwner(kFALSE);
4d6aee34 2016 } else AliTRDReconstructor::SetClusters(NULL);
48f8adf3 2017 }
0906e73e 2018
053767a4 2019 for (int i = 0; i < AliTRDgeometry::kNsector; i++) fTrSec[i].Clear();
0906e73e 2020
41702fec 2021 // Increment the Event Number
2022 AliTRDtrackerDebug::SetEventNumber(AliTRDtrackerDebug::GetEventNumber() + 1);
eb38ed55 2023}
0906e73e 2024
fac58f00 2025// //____________________________________________________________________
2026// void AliTRDtrackerV1::UseClusters(const AliKalmanTrack *t, Int_t) const
2027// {
2028// const AliTRDtrackV1 *track = dynamic_cast<const AliTRDtrackV1*>(t);
2029// if(!track) return;
2030//
4d6aee34 2031// AliTRDseedV1 *tracklet = NULL;
fac58f00 2032// for(Int_t ily=AliTRDgeometry::kNlayer; ily--;){
2033// if(!(tracklet = track->GetTracklet(ily))) continue;
4d6aee34 2034// AliTRDcluster *c = NULL;
8d2bec9e 2035// for(Int_t ic=AliTRDseed::kNclusters; ic--;){
fac58f00 2036// if(!(c=tracklet->GetClusters(ic))) continue;
2037// c->Use();
2038// }
2039// }
2040// }
2041//
b1957d3c 2042
eb38ed55 2043//_____________________________________________________________________________
4d6aee34 2044Bool_t AliTRDtrackerV1::AdjustSector(AliTRDtrackV1 *const track)
eb38ed55 2045{
41702fec 2046 //
2047 // Rotates the track when necessary
2048 //
2049
2050 Double_t alpha = AliTRDgeometry::GetAlpha();
2051 Double_t y = track->GetY();
2052 Double_t ymax = track->GetX()*TMath::Tan(0.5*alpha);
3cfaffa4 2053
41702fec 2054 if (y > ymax) {
2055 if (!track->Rotate( alpha)) {
2056 return kFALSE;
2057 }
2058 }
2059 else if (y < -ymax) {
2060 if (!track->Rotate(-alpha)) {
2061 return kFALSE;
2062 }
2063 }
2064
2065 return kTRUE;
0906e73e 2066
2067}
2068
eb38ed55 2069
0906e73e 2070//____________________________________________________________________
4d6aee34 2071AliTRDseedV1* AliTRDtrackerV1::GetTracklet(AliTRDtrackV1 *const track, Int_t p, Int_t &idx)
0906e73e 2072{
41702fec 2073 // Find tracklet for TRD track <track>
2074 // Parameters
2075 // - track
2076 // - sector
2077 // - plane
2078 // - index
2079 // Output
2080 // tracklet
2081 // index
2082 // Detailed description
2083 //
2084 idx = track->GetTrackletIndex(p);
17896e82 2085 AliTRDseedV1 *tracklet = (idx<0) ? NULL : (AliTRDseedV1*)fTracklets->UncheckedAt(idx);
41702fec 2086
2087 return tracklet;
0906e73e 2088}
2089
2090//____________________________________________________________________
4d6aee34 2091AliTRDseedV1* AliTRDtrackerV1::SetTracklet(const AliTRDseedV1 * const tracklet)
0906e73e 2092{
41702fec 2093 // Add this tracklet to the list of tracklets stored in the tracker
2094 //
2095 // Parameters
2096 // - tracklet : pointer to the tracklet to be added to the list
2097 //
2098 // Output
2099 // - the index of the new tracklet in the tracker tracklets list
2100 //
2101 // Detailed description
2102 // Build the tracklets list if it is not yet created (late initialization)
2103 // and adds the new tracklet to the list.
2104 //
2105 if(!fTracklets){
053767a4 2106 fTracklets = new TClonesArray("AliTRDseedV1", AliTRDgeometry::Nsector()*kMaxTracksStack);
41702fec 2107 fTracklets->SetOwner(kTRUE);
2108 }
2109 Int_t nentries = fTracklets->GetEntriesFast();
2110 return new ((*fTracklets)[nentries]) AliTRDseedV1(*tracklet);
972ef65e 2111}
2112
d20df6fc 2113//____________________________________________________________________
4d6aee34 2114AliTRDtrackV1* AliTRDtrackerV1::SetTrack(const AliTRDtrackV1 * const track)
d20df6fc 2115{
2116 // Add this track to the list of tracks stored in the tracker
2117 //
2118 // Parameters
2119 // - track : pointer to the track to be added to the list
2120 //
2121 // Output
2122 // - the pointer added
2123 //
2124 // Detailed description
2125 // Build the tracks list if it is not yet created (late initialization)
2126 // and adds the new track to the list.
2127 //
2128 if(!fTracks){
053767a4 2129 fTracks = new TClonesArray("AliTRDtrackV1", AliTRDgeometry::Nsector()*kMaxTracksStack);
d20df6fc 2130 fTracks->SetOwner(kTRUE);
2131 }
2132 Int_t nentries = fTracks->GetEntriesFast();
2133 return new ((*fTracks)[nentries]) AliTRDtrackV1(*track);
2134}
2135
2136
0906e73e 2137
e4f2f73d 2138//____________________________________________________________________
eb38ed55 2139Int_t AliTRDtrackerV1::Clusters2TracksSM(Int_t sector, AliESDEvent *esd)
e4f2f73d 2140{
41702fec 2141 //
2142 // Steer tracking for one SM.
2143 //
2144 // Parameters :
2145 // sector : Array of (SM) propagation layers containing clusters
2146 // esd : The current ESD event. On output it contains the also
2147 // the ESD (TRD) tracks found in this SM.
2148 //
2149 // Output :
2150 // Number of tracks found in this TRD supermodule.
2151 //
2152 // Detailed description
2153 //
2154 // 1. Unpack AliTRDpropagationLayers objects for each stack.
2155 // 2. Launch stack tracking.
2156 // See AliTRDtrackerV1::Clusters2TracksStack() for details.
2157 // 3. Pack results in the ESD event.
2158 //
2159
41702fec 2160 Int_t nTracks = 0;
2161 Int_t nChambers = 0;
4d6aee34 2162 AliTRDtrackingChamber **stack = NULL, *chamber = NULL;
053767a4 2163 for(int istack = 0; istack<AliTRDgeometry::kNstack; istack++){
41702fec 2164 if(!(stack = fTrSec[sector].GetStack(istack))) continue;
2165 nChambers = 0;
053767a4 2166 for(int ilayer=0; ilayer<AliTRDgeometry::kNlayer; ilayer++){
2167 if(!(chamber = stack[ilayer])) continue;
9e85cb05 2168 if(chamber->GetNClusters() < fgNTimeBins * fkRecoParam->GetFindableClusters()) continue;
41702fec 2169 nChambers++;
053767a4 2170 //AliInfo(Form("sector %d stack %d layer %d clusters %d", sector, istack, ilayer, chamber->GetNClusters()));
41702fec 2171 }
2172 if(nChambers < 4) continue;
2173 //AliInfo(Form("Doing stack %d", istack));
b1135f96 2174 nTracks += Clusters2TracksStack(stack, fTracksESD);
41702fec 2175 }
050875b0 2176 if(nTracks) AliDebug(2, Form("Number of tracks: SM_%02d[%d]", sector, nTracks));
2177
352cef8f 2178 for(int itrack=0; itrack<nTracks; itrack++){
2179 AliESDtrack *esdTrack((AliESDtrack*)(fTracksESD->operator[](itrack)));
2180 Int_t id = esd->AddTrack(esdTrack);
2181
2182 // set ESD id to stand alone TRD tracks
9e85cb05 2183 if (fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 0){
352cef8f 2184 esdTrack=esd->GetTrack(id);
2185 TObject *o(NULL); Int_t ic(0);
2186 AliTRDtrackV1 *calibTrack(NULL);
2187 while((o = esdTrack->GetCalibObject(ic++))){
2188 if(!(calibTrack = dynamic_cast<AliTRDtrackV1*>(o))) continue;
2189 calibTrack->SetESDid(esdTrack->GetID());
2190 break;
2191 }
2192 }
2193 }
41702fec 2194
2195 // Reset Track and Candidate Number
2196 AliTRDtrackerDebug::SetCandidateNumber(0);
2197 AliTRDtrackerDebug::SetTrackNumber(0);
b1135f96 2198
2199 // delete ESD tracks in the array
2200 fTracksESD->Delete();
41702fec 2201 return nTracks;
e4f2f73d 2202}
2203
2204//____________________________________________________________________
4d6aee34 2205Int_t AliTRDtrackerV1::Clusters2TracksStack(AliTRDtrackingChamber **stack, TClonesArray * const esdTrackList)
e4f2f73d 2206{
41702fec 2207 //
2208 // Make tracks in one TRD stack.
2209 //
2210 // Parameters :
2211 // layer : Array of stack propagation layers containing clusters
2212 // esdTrackList : Array of ESD tracks found by the stand alone tracker.
2213 // On exit the tracks found in this stack are appended.
2214 //
2215 // Output :
2216 // Number of tracks found in this stack.
2217 //
2218 // Detailed description
2219 //
2220 // 1. Find the 3 most useful seeding chambers. See BuildSeedingConfigs() for details.
2221 // 2. Steer AliTRDtrackerV1::MakeSeeds() for 3 seeding layer configurations.
2222 // See AliTRDtrackerV1::MakeSeeds() for more details.
2223 // 3. Arrange track candidates in decreasing order of their quality
2224 // 4. Classify tracks in 5 categories according to:
2225 // a) number of layers crossed
2226 // b) track quality
2227 // 5. Sign clusters by tracks in decreasing order of track quality
2228 // 6. Build AliTRDtrack out of seeding tracklets
2229 // 7. Cook MC label
2230 // 8. Build ESD track and register it to the output list
2231 //
2232
4d6aee34 2233 AliTRDtrackingChamber *chamber = NULL;
2234 AliTRDtrackingChamber **ci = NULL;
41702fec 2235 AliTRDseedV1 sseed[kMaxTracksStack*6]; // to be initialized
2236 Int_t pars[4]; // MakeSeeds parameters
2237
2238 //Double_t alpha = AliTRDgeometry::GetAlpha();
2239 //Double_t shift = .5 * alpha;
2240 Int_t configs[kNConfigs];
2241
fac58f00 2242 // Purge used clusters from the containers
2243 ci = &stack[0];
2244 for(Int_t ic = kNPlanes; ic--; ci++){
2245 if(!(*ci)) continue;
2246 (*ci)->Update();
2247 }
2248
41702fec 2249 // Build initial seeding configurations
2250 Double_t quality = BuildSeedingConfigs(stack, configs);
9e85cb05 2251 if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 10){
41702fec 2252 AliInfo(Form("Plane config %d %d %d Quality %f"
2253 , configs[0], configs[1], configs[2], quality));
2254 }
d931f2aa 2255
41702fec 2256
2257 // Initialize contors
2258 Int_t ntracks, // number of TRD track candidates
2259 ntracks1, // number of registered TRD tracks/iter
2260 ntracks2 = 0; // number of all registered TRD tracks in stack
2261 fSieveSeeding = 0;
d931f2aa 2262
2263 // Get stack index
fac58f00 2264 Int_t ic = 0; ci = &stack[0];
2265 while(ic<kNPlanes && !(*ci)){ic++; ci++;}
2266 if(!(*ci)) return ntracks2;
2267 Int_t istack = fGeom->GetStack((*ci)->GetDetector());
d931f2aa 2268
41702fec 2269 do{
2270 // Loop over seeding configurations
2271 ntracks = 0; ntracks1 = 0;
2272 for (Int_t iconf = 0; iconf<3; iconf++) {
2273 pars[0] = configs[iconf];
2274 pars[1] = ntracks;
d931f2aa 2275 pars[2] = istack;
41702fec 2276 ntracks = MakeSeeds(stack, &sseed[6*ntracks], pars);
6e39bde4 2277 //AliInfo(Form("Number of Tracks after iteration step %d: %d\n", iconf, ntracks));
41702fec 2278 if(ntracks == kMaxTracksStack) break;
2279 }
980d5a2a 2280 AliDebug(2, Form("Candidate TRD tracks %d in iteration %d.", ntracks, fSieveSeeding));
41702fec 2281 if(!ntracks) break;
2282
2283 // Sort the seeds according to their quality
2284 Int_t sort[kMaxTracksStack];
2285 TMath::Sort(ntracks, fTrackQuality, sort, kTRUE);
68f9b6bd 2286 if(AliLog::GetDebugLevel("TRD", "AliTRDtrackerV1") > 2){
2287 AliDebug(3, "Track candidates classification:");
2288 for (Int_t it(0); it < ntracks; it++) {
2289 Int_t jt(sort[it]);
2290 printf(" %2d idx[%d] Quality[%e]\n", it, jt, fTrackQuality[jt]);
2291 }
2292 }
41702fec 2293
2294 // Initialize number of tracks so far and logic switches
2295 Int_t ntracks0 = esdTrackList->GetEntriesFast();
2296 Bool_t signedTrack[kMaxTracksStack];
2297 Bool_t fakeTrack[kMaxTracksStack];
2298 for (Int_t i=0; i<ntracks; i++){
2299 signedTrack[i] = kFALSE;
2300 fakeTrack[i] = kFALSE;
2301 }
2302 //AliInfo("Selecting track candidates ...");
2303
2304 // Sieve clusters in decreasing order of track quality
68f9b6bd 2305 Int_t jSieve(0), rejectedCandidates(0);
41702fec 2306 do{
41702fec 2307 // Check track candidates
68f9b6bd 2308 rejectedCandidates=0;
41702fec 2309 for (Int_t itrack = 0; itrack < ntracks; itrack++) {
804bb02e 2310 Int_t trackIndex = sort[itrack];
2311 if (signedTrack[trackIndex] || fakeTrack[trackIndex]) continue;
41702fec 2312
804bb02e 2313 // Calculate track parameters from tracklets seeds
804bb02e 2314 Int_t ncl = 0;
2315 Int_t nused = 0;
2316 Int_t nlayers = 0;
2317 Int_t findable = 0;
2318 for (Int_t jLayer = 0; jLayer < kNPlanes; jLayer++) {
2319 Int_t jseed = kNPlanes*trackIndex+jLayer;
68f9b6bd 2320 sseed[jseed].UpdateUsed();
804bb02e 2321 if(!sseed[jseed].IsOK()) continue;
68f9b6bd 2322 // check if primary candidate
f29f13a6 2323 if (TMath::Abs(sseed[jseed].GetYref(0) / sseed[jseed].GetX0()) < 0.158) findable++;
68f9b6bd 2324 ncl += sseed[jseed].GetN();
804bb02e 2325 nused += sseed[jseed].GetNUsed();
2326 nlayers++;
804bb02e 2327 }
2328
f29f13a6 2329 // Filter duplicated tracks
2330 if (nused > 30){
68f9b6bd 2331 AliDebug(4, Form("REJECTED : %d idx[%d] quality[%e] tracklets[%d] usedClusters[%d]", itrack, trackIndex, fTrackQuality[trackIndex], nlayers, nused));
f29f13a6 2332 fakeTrack[trackIndex] = kTRUE;
2333 continue;
2334 }
5ef88e00 2335 if (ncl>0 && Float_t(nused)/ncl >= .25){
68f9b6bd 2336 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));
f29f13a6 2337 fakeTrack[trackIndex] = kTRUE;
2338 continue;
2339 }
41702fec 2340
68f9b6bd 2341 AliDebug(4, Form("Candidate[%d] Quality[%e] Tracklets[%d] Findable[%d] Ncl[%d] Nused[%d]", trackIndex, fTrackQuality[trackIndex], nlayers, findable, ncl, nused));
2342
f29f13a6 2343 // Classify tracks
2344 Bool_t skip = kFALSE;
2345 switch(jSieve){
68f9b6bd 2346 case 0: // select 6 tracklets primary tracks, good quality
2347 if(nlayers > findable || nlayers < kNPlanes) {skip = kTRUE; break;}
f29f13a6 2348 if(TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -5.){skip = kTRUE; break;}
2349 break;
2350
68f9b6bd 2351 case 1: // select shorter primary tracks, good quality
2352 if(findable<4){skip = kTRUE; break;}
f29f13a6 2353 if(nlayers < findable){skip = kTRUE; break;}
2354 if(TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -4.){skip = kTRUE; break;}
2355 break;
2356
68f9b6bd 2357 case 2: // select 6 tracklets secondary tracks
2358 if(nlayers < kNPlanes) { skip = kTRUE; break;}
f29f13a6 2359 if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -6.0){skip = kTRUE; break;}
2360 break;
2361
68f9b6bd 2362 case 3: // select shorter tracks, good quality
2363 if (nlayers<4){skip = kTRUE; break;}
f29f13a6 2364 if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -5.){skip = kTRUE; break;}
2365 break;
2366
68f9b6bd 2367 case 4: // select anything with at least 4 tracklets
2368 if (nlayers<4){skip = kTRUE; break;}
f29f13a6 2369 //if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) - nused/(nlayers-3.0) < -15.0){skip = kTRUE; break;}
2370 break;
2371 }
2372 if(skip){
68f9b6bd 2373 rejectedCandidates++;
5ef88e00 2374 AliDebug(4, Form("REJECTED : %d idx[%d] quality[%e] tracklets[%d] usedClusters[%d]", itrack, trackIndex, fTrackQuality[trackIndex], nlayers, nused));
f29f13a6 2375 continue;
5ef88e00 2376 } else AliDebug(4, Form("ACCEPTED : %d idx[%d] quality[%e] tracklets[%d] usedClusters[%d]", itrack, trackIndex, fTrackQuality[trackIndex], nlayers, nused));
2377
f29f13a6 2378 signedTrack[trackIndex] = kTRUE;
2379
68f9b6bd 2380 AliTRDseedV1 *lseed =&sseed[trackIndex*kNPlanes];
2381 AliTRDtrackV1 *track = MakeTrack(lseed);
2382 if(!track){
2383 AliDebug(1, "Track building failed.");
2384 continue;
2385 } else {
2386 if(AliLog::GetDebugLevel("TRD", "AliTRDtrackerV1") > 1){
2387 Int_t ich = 0; while(!(chamber = stack[ich])) ich++;
2388 AliDebug(2, Form("Track pt=%7.2fGeV/c SM[%2d] Done.", track->Pt(), fGeom->GetSector(chamber->GetDetector())));
2389 }
2390 }
f29f13a6 2391
9e85cb05 2392 if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 1 && fkReconstructor->IsDebugStreaming()){
eb2b4f91 2393 //AliInfo(Form("Track %d [%d] nlayers %d trackQuality = %e nused %d, yref = %3.3f", itrack, trackIndex, nlayers, fTrackQuality[trackIndex], nused, trackParams[1]));
f29f13a6 2394
f29f13a6 2395 AliTRDseedV1 *dseed[6];
b82b4de1 2396 for(Int_t iseed = AliTRDgeometry::kNlayer; iseed--;) dseed[iseed] = new AliTRDseedV1(lseed[iseed]);
f29f13a6 2397
2398 //Int_t eventNrInFile = esd->GetEventNumberInFile();
f29f13a6 2399 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2400 Int_t trackNumber = AliTRDtrackerDebug::GetTrackNumber();
2401 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
a2fbb6ec 2402 TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
f29f13a6 2403 cstreamer << "Clusters2TracksStack"
68f9b6bd 2404 << "EventNumber=" << eventNumber
2405 << "TrackNumber=" << trackNumber
2406 << "CandidateNumber=" << candidateNumber
2407 << "Iter=" << fSieveSeeding
2408 << "Like=" << fTrackQuality[trackIndex]
2409 << "S0.=" << dseed[0]
2410 << "S1.=" << dseed[1]
2411 << "S2.=" << dseed[2]
2412 << "S3.=" << dseed[3]
2413 << "S4.=" << dseed[4]
2414 << "S5.=" << dseed[5]
2415 << "Ncl=" << ncl
2416 << "NLayers=" << nlayers
2417 << "Findable=" << findable
2418 << "NUsed=" << nused
f29f13a6 2419 << "\n";
2420 }
d877f55f 2421
68f9b6bd 2422
f29f13a6 2423 AliESDtrack *esdTrack = new ((*esdTrackList)[ntracks0++]) AliESDtrack();
2424 esdTrack->UpdateTrackParams(track, AliESDtrack::kTRDout);
2425 esdTrack->SetLabel(track->GetLabel());
2426 track->UpdateESDtrack(esdTrack);
2427 // write ESD-friends if neccessary
9e85cb05 2428 if (fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 0){
f29f13a6 2429 AliTRDtrackV1 *calibTrack = new AliTRDtrackV1(*track);
2430 calibTrack->SetOwner();
2431 esdTrack->AddCalibObject(calibTrack);
2432 }
2433 ntracks1++;
2434 AliTRDtrackerDebug::SetTrackNumber(AliTRDtrackerDebug::GetTrackNumber() + 1);
41702fec 2435 }
2436
2437 jSieve++;
68f9b6bd 2438 } while(jSieve<5 && rejectedCandidates); // end track candidates sieve
41702fec 2439 if(!ntracks1) break;
2440
2441 // increment counters
2442 ntracks2 += ntracks1;
4302c900 2443
4d6aee34 2444 if(fkReconstructor->IsHLT()) break;
41702fec 2445 fSieveSeeding++;
2446
2447 // Rebuild plane configurations and indices taking only unused clusters into account
2448 quality = BuildSeedingConfigs(stack, configs);
4d6aee34 2449 if(quality < 1.E-7) break; //fkReconstructor->GetRecoParam() ->GetPlaneQualityThreshold()) break;
41702fec 2450
2451 for(Int_t ip = 0; ip < kNPlanes; ip++){
2452 if(!(chamber = stack[ip])) continue;
c79857d5 2453 chamber->Build(fGeom);//Indices(fSieveSeeding);
41702fec 2454 }
2455
9e85cb05 2456 if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 10){
41702fec 2457 AliInfo(Form("Sieve level %d Plane config %d %d %d Quality %f", fSieveSeeding, configs[0], configs[1], configs[2], quality));
2458 }
2459 } while(fSieveSeeding<10); // end stack clusters sieve
2460
2461
2462
2463 //AliInfo(Form("Registered TRD tracks %d in stack %d.", ntracks2, pars[1]));
2464
2465 return ntracks2;
e4f2f73d 2466}
2467
2468//___________________________________________________________________
eb38ed55 2469Double_t AliTRDtrackerV1::BuildSeedingConfigs(AliTRDtrackingChamber **stack, Int_t *configs)
e4f2f73d 2470{
41702fec 2471 //
2472 // Assign probabilities to chambers according to their
2473 // capability of producing seeds.
2474 //
2475 // Parameters :
2476 //
2477 // layers : Array of stack propagation layers for all 6 chambers in one stack
2478 // configs : On exit array of configuration indexes (see GetSeedingConfig()
2479 // for details) in the decreasing order of their seeding probabilities.
2480 //
2481 // Output :
2482 //
2483 // Return top configuration quality
2484 //
2485 // Detailed description:
2486 //
2487 // To each chamber seeding configuration (see GetSeedingConfig() for
2488 // the list of all configurations) one defines 2 quality factors:
2489 // - an apriori topological quality (see GetSeedingConfig() for details) and
2490 // - a data quality based on the uniformity of the distribution of
2491 // clusters over the x range (time bins population). See CookChamberQA() for details.
2492 // The overall chamber quality is given by the product of this 2 contributions.
2493 //
2494
eb2b4f91 2495 Double_t chamberQ[kNPlanes];memset(chamberQ, 0, kNPlanes*sizeof(Double_t));
4d6aee34 2496 AliTRDtrackingChamber *chamber = NULL;
41702fec 2497 for(int iplane=0; iplane<kNPlanes; iplane++){
2498 if(!(chamber = stack[iplane])) continue;
2499 chamberQ[iplane] = (chamber = stack[iplane]) ? chamber->GetQuality() : 0.;
2500 }
2501
eb2b4f91 2502 Double_t tconfig[kNConfigs];memset(tconfig, 0, kNConfigs*sizeof(Double_t));
2503 Int_t planes[] = {0, 0, 0, 0};
41702fec 2504 for(int iconf=0; iconf<kNConfigs; iconf++){
2505 GetSeedingConfig(iconf, planes);
2506 tconfig[iconf] = fgTopologicQA[iconf];
2507 for(int iplane=0; iplane<4; iplane++) tconfig[iconf] *= chamberQ[planes[iplane]];
2508 }
2509
2510 TMath::Sort((Int_t)kNConfigs, tconfig, configs, kTRUE);
2511 // AliInfo(Form("q[%d] = %f", configs[0], tconfig[configs[0]]));
2512 // AliInfo(Form("q[%d] = %f", configs[1], tconfig[configs[1]]));
2513 // AliInfo(Form("q[%d] = %f", configs[2], tconfig[configs[2]]));
2514
2515 return tconfig[configs[0]];
e4f2f73d 2516}
2517
2518//____________________________________________________________________
e17f4785 2519Int_t AliTRDtrackerV1::MakeSeeds(AliTRDtrackingChamber **stack, AliTRDseedV1 * const sseed, const Int_t * const ipar)
e4f2f73d 2520{
afa21247 2521//
2a3191bb 2522// Seed tracklets and build candidate TRD tracks. The procedure is used during barrel tracking to account for tracks which are
2523// either missed by TPC prolongation or conversions inside the TRD volume.
2524// For stand alone tracking the procedure is used to estimate all tracks measured by TRD.
afa21247 2525//
2526// Parameters :
2527// layers : Array of stack propagation layers containing clusters
2528// sseed : Array of empty tracklet seeds. On exit they are filled.
2529// ipar : Control parameters:
2530// ipar[0] -> seeding chambers configuration
2531// ipar[1] -> stack index
2532// ipar[2] -> number of track candidates found so far
2533//
2534// Output :
2535// Number of tracks candidates found.
2536//
2537// The following steps are performed:
2538// 1. Build seeding layers by collapsing all time bins from each of the four seeding chambers along the
2539// radial coordinate. See AliTRDtrackingChamber::GetSeedingLayer() for details. The chambers selection for seeding
2540// is described in AliTRDtrackerV1::Clusters2TracksStack().
2541// 2. Using the seeding clusters from the seeding layer (step 1) build combinatorics using the following algorithm:
2542// - for each seeding cluster in the lower seeding layer find
2543// - all seeding clusters in the upper seeding layer inside a road defined by a given phi angle. The angle
2544// is calculated on the minimum pt of tracks from vertex accesible to the stand alone tracker.
2545// - for each pair of two extreme seeding clusters select middle upper cluster using roads defined externally by the
2546// reco params
2547// - select last seeding cluster as the nearest to the linear approximation of the track described by the first three
2548// seeding clusters.
2549// The implementation of road calculation and cluster selection can be found in the functions AliTRDchamberTimeBin::BuildCond()
2550// and AliTRDchamberTimeBin::GetClusters().
2551// 3. Helix fit of the seeding clusters set. (see AliTRDtrackerFitter::FitRieman(AliTRDcluster**)). No tilt correction is
2552// performed at this level
2553// 4. Initialize seeding tracklets in the seeding chambers.
2554// 5. *Filter 0* Chi2 cut on the Y and Z directions. The threshold is set externally by the reco params.
2555// 6. Attach (true) clusters to seeding tracklets (see AliTRDseedV1::AttachClusters()) and fit tracklet (see
2556// AliTRDseedV1::Fit()). The number of used clusters used by current seeds should not exceed ... (25).
2557// 7. *Filter 1* Check if all 4 seeding tracklets are correctly constructed.
2558// 8. Helix fit of the clusters from the seeding tracklets with tilt correction. Refit tracklets using the new
2559// approximation of the track.
2560// 9. *Filter 2* Calculate likelihood of the track. (See AliTRDtrackerV1::CookLikelihood()). The following quantities are
2561// checked against the Riemann fit:
2562// - position resolution in y
2563// - angular resolution in the bending plane
2564// - likelihood of the number of clusters attached to the tracklet
2565// 10. Extrapolation of the helix fit to the other 2 chambers *non seeding* chambers:
2566// - Initialization of extrapolation tracklets with the fit parameters
2567// - Attach clusters to extrapolated tracklets
2568// - Helix fit of tracklets
2569// 11. Improve seeding tracklets quality by reassigning clusters based on the last parameters of the track
2570// See AliTRDtrackerV1::ImproveSeedQuality() for details.
2571// 12. Helix fit of all 6 seeding tracklets and chi2 calculation
2572// 13. Hyperplane fit and track quality calculation. See AliTRDtrackerFitter::FitHyperplane() for details.
2573// 14. Cooking labels for tracklets. Should be done only for MC
2574// 15. Register seeds.
2575//
2576// Authors:
2577// Marian Ivanov <M.Ivanov@gsi.de>
2578// Alexandru Bercuci <A.Bercuci@gsi.de>
2579// Markus Fasel <M.Fasel@gsi.de>
41702fec 2580
4d6aee34 2581 AliTRDtrackingChamber *chamber = NULL;
2582 AliTRDcluster *c[kNSeedPlanes] = {NULL, NULL, NULL, NULL}; // initilize seeding clusters
e17f4785 2583 AliTRDseedV1 *cseed = &sseed[0]; // initialize tracklets for first track
41702fec 2584 Int_t ncl, mcl; // working variable for looping over clusters
2585 Int_t index[AliTRDchamberTimeBin::kMaxClustersLayer], jndex[AliTRDchamberTimeBin::kMaxClustersLayer];
2586 // chi2 storage
2587 // chi2[0] = tracklet chi2 on the Z direction
2588 // chi2[1] = tracklet chi2 on the R direction
2589 Double_t chi2[4];
2590
afa21247 2591 // this should be data member of AliTRDtrack TODO
41702fec 2592 Double_t seedQuality[kMaxTracksStack];
2593
2594 // unpack control parameters
2595 Int_t config = ipar[0];
2596 Int_t ntracks = ipar[1];
d931f2aa 2597 Int_t istack = ipar[2];
41702fec 2598 Int_t planes[kNSeedPlanes]; GetSeedingConfig(config, planes);
afa21247 2599 Int_t planesExt[kNPlanes-kNSeedPlanes]; GetExtrapolationConfig(config, planesExt);
be24510a 2600
2601
41702fec 2602 // Init chambers geometry
41702fec 2603 Double_t hL[kNPlanes]; // Tilting angle
2604 Float_t padlength[kNPlanes]; // pad lenghts
dd8059a8 2605 Float_t padwidth[kNPlanes]; // pad widths
4d6aee34 2606 AliTRDpadPlane *pp = NULL;
41702fec 2607 for(int iplane=0; iplane<kNPlanes; iplane++){
2608 pp = fGeom->GetPadPlane(iplane, istack);
bb79ccd5 2609 hL[iplane] = TMath::Tan(TMath::DegToRad()*pp->GetTiltingAngle());
41702fec 2610 padlength[iplane] = pp->GetLengthIPad();
dd8059a8 2611 padwidth[iplane] = pp->GetWidthIPad();
41702fec 2612 }
2613
eb2b4f91 2614 // Init anode wire position for chambers
e165b64b 2615 Double_t x0[kNPlanes], // anode wire position
eb2b4f91 2616 driftLength = .5*AliTRDgeometry::AmThick() - AliTRDgeometry::DrThick(); // drift length
4d6aee34 2617 TGeoHMatrix *matrix = NULL;
eb2b4f91 2618 Double_t loc[] = {AliTRDgeometry::AnodePos(), 0., 0.};
2619 Double_t glb[] = {0., 0., 0.};
2620 AliTRDtrackingChamber **cIter = &stack[0];
a3743898 2621 for(int iLayer=0; iLayer<kNPlanes; iLayer++,cIter++){
eb2b4f91 2622 if(!(*cIter)) continue;
e165b64b 2623 if(!(matrix = fGeom->GetClusterMatrix((*cIter)->GetDetector()))){
2624 continue;
2625 x0[iLayer] = fgkX0[iLayer];
2626 }
eb2b4f91 2627 matrix->LocalToMaster(loc, glb);
2628 x0[iLayer] = glb[0];
2629 }
2630
980d5a2a 2631 AliDebug(2, Form("Making seeds Stack[%d] Config[%d] Tracks[%d]...", istack, config, ntracks));
41702fec 2632
d931f2aa 2633 // Build seeding layers
d611c74f 2634 ResetSeedTB();
41702fec 2635 Int_t nlayers = 0;
41702fec 2636 for(int isl=0; isl<kNSeedPlanes; isl++){
2637 if(!(chamber = stack[planes[isl]])) continue;
4d6aee34 2638 if(!chamber->GetSeedingLayer(fSeedTB[isl], fGeom, fkReconstructor)) continue;
41702fec 2639 nlayers++;
41702fec 2640 }
eb2b4f91 2641 if(nlayers < kNSeedPlanes) return ntracks;
41702fec 2642
2643
2644 // Start finding seeds
2645 Double_t cond0[4], cond1[4], cond2[4];
2646 Int_t icl = 0;
d611c74f 2647 while((c[3] = (*fSeedTB[3])[icl++])){
41702fec 2648 if(!c[3]) continue;
d611c74f 2649 fSeedTB[0]->BuildCond(c[3], cond0, 0);
2650 fSeedTB[0]->GetClusters(cond0, index, ncl);
41702fec 2651 //printf("Found c[3] candidates 0 %d\n", ncl);
2652 Int_t jcl = 0;
2653 while(jcl<ncl) {
d611c74f 2654 c[0] = (*fSeedTB[0])[index[jcl++]];
41702fec 2655 if(!c[0]) continue;
2656 Double_t dx = c[3]->GetX() - c[0]->GetX();
afa21247 2657 Double_t dzdx = (c[3]->GetZ() - c[0]->GetZ())/dx;
2658 Double_t dydx = (c[3]->GetY() - c[0]->GetY())/dx;
2659 fSeedTB[1]->BuildCond(c[0], cond1, 1, dzdx, dydx);
d611c74f 2660 fSeedTB[1]->GetClusters(cond1, jndex, mcl);
41702fec 2661 //printf("Found c[0] candidates 1 %d\n", mcl);
2662
2663 Int_t kcl = 0;
2664 while(kcl<mcl) {
d611c74f 2665 c[1] = (*fSeedTB[1])[jndex[kcl++]];
2666 if(!c[1]) continue;
afa21247 2667 fSeedTB[2]->BuildCond(c[1], cond2, 2, dzdx, dydx);
d611c74f 2668 c[2] = fSeedTB[2]->GetNearestCluster(cond2);
2669 //printf("Found c[1] candidate 2 %p\n", c[2]);
2670 if(!c[2]) continue;
980d5a2a 2671
2672 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].",
2673 c[0]->GetX(), c[0]->GetY(), c[0]->GetZ(),
2674 c[1]->GetX(), c[1]->GetY(), c[1]->GetZ(),
2675 c[2]->GetX(), c[2]->GetY(), c[2]->GetZ(),
2676 c[3]->GetX(), c[3]->GetY(), c[3]->GetZ()));
d611c74f 2677
804bb02e 2678 for (Int_t il = 0; il < kNPlanes; il++) cseed[il].Reset();
41702fec 2679
d611c74f 2680 FitRieman(c, chi2);
2681
d931f2aa 2682 AliTRDseedV1 *tseed = &cseed[0];
bb2db46c 2683 cIter = &stack[0];
2684 for(int iLayer=0; iLayer<kNPlanes; iLayer++, tseed++, cIter++){
2685 Int_t det = (*cIter) ? (*cIter)->GetDetector() : -1;
eb2b4f91 2686 tseed->SetDetector(det);
43d6ad34 2687 tseed->SetTilt(hL[iLayer]);
2688 tseed->SetPadLength(padlength[iLayer]);
dd8059a8 2689 tseed->SetPadWidth(padwidth[iLayer]);
4d6aee34 2690 tseed->SetReconstructor(fkReconstructor);
eb2b4f91 2691 tseed->SetX0(det<0 ? fR[iLayer]+driftLength : x0[iLayer]);
d611c74f 2692 tseed->Init(GetRiemanFitter());
f29f13a6 2693 tseed->SetStandAlone(kTRUE);
d611c74f 2694 }
2695
2696 Bool_t isFake = kFALSE;
9e85cb05 2697 if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) >= 2 && fkReconstructor->IsDebugStreaming()){
d611c74f 2698 if (c[0]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
2699 if (c[1]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
2700 if (c[2]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
2701
2702 Double_t xpos[4];
2703 for(Int_t l = 0; l < kNSeedPlanes; l++) xpos[l] = fSeedTB[l]->GetX();
2704 Float_t yref[4];
2705 for(int il=0; il<4; il++) yref[il] = cseed[planes[il]].GetYref(0);
2706 Int_t ll = c[3]->GetLabel(0);
2707 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2708 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2709 AliRieman *rim = GetRiemanFitter();
a2fbb6ec 2710 TTreeSRedirector &cs0 = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
d611c74f 2711 cs0 << "MakeSeeds0"
2712 <<"EventNumber=" << eventNumber
2713 <<"CandidateNumber=" << candidateNumber
2714 <<"isFake=" << isFake
2715 <<"config=" << config
2716 <<"label=" << ll
2717 <<"chi2z=" << chi2[0]
2718 <<"chi2y=" << chi2[1]
2719 <<"Y2exp=" << cond2[0]
2720 <<"Z2exp=" << cond2[1]
2721 <<"X0=" << xpos[0] //layer[sLayer]->GetX()
2722 <<"X1=" << xpos[1] //layer[sLayer + 1]->GetX()
2723 <<"X2=" << xpos[2] //layer[sLayer + 2]->GetX()
2724 <<"X3=" << xpos[3] //layer[sLayer + 3]->GetX()
2725 <<"yref0=" << yref[0]
2726 <<"yref1=" << yref[1]
2727 <<"yref2=" << yref[2]
2728 <<"yref3=" << yref[3]
2729 <<"c0.=" << c[0]
2730 <<"c1.=" << c[1]
2731 <<"c2.=" << c[2]
2732 <<"c3.=" << c[3]
2733 <<"Seed0.=" << &cseed[planes[0]]
2734 <<"Seed1.=" << &cseed[planes[1]]
2735 <<"Seed2.=" << &cseed[planes[2]]
2736 <<"Seed3.=" << &cseed[planes[3]]
2737 <<"RiemanFitter.=" << rim
2738 <<"\n";
2739 }
9e85cb05 2740 if(chi2[0] > fkRecoParam->GetChi2Z()/*7./(3. - sLayer)*//*iter*/){
980d5a2a 2741 AliDebug(3, Form("Filter on chi2Z [%f].", chi2[0]));
d611c74f 2742 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2743 continue;
2744 }
9e85cb05 2745 if(chi2[1] > fkRecoParam->GetChi2Y()/*1./(3. - sLayer)*//*iter*/){
980d5a2a 2746 AliDebug(3, Form("Filter on chi2Y [%f].", chi2[1]));
d611c74f 2747 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2748 continue;
2749 }
2750 //AliInfo("Passed chi2 filter.");
2751
2752 // try attaching clusters to tracklets
6e39bde4 2753 Int_t mlayers = 0;
980d5a2a 2754 AliTRDcluster *cl = NULL;
be24510a 2755 for(int iLayer=0; iLayer<kNSeedPlanes; iLayer++){
d611c74f 2756 Int_t jLayer = planes[iLayer];
980d5a2a 2757 Int_t nNotInChamber = 0;
f29f13a6 2758 if(!cseed[jLayer].AttachClusters(stack[jLayer], kTRUE)) continue;
980d5a2a 2759 if(/*fkReconstructor->IsHLT()*/kFALSE){
2760 cseed[jLayer].UpdateUsed();
2761 if(!cseed[jLayer].IsOK()) continue;
2762 }else{
2763 cseed[jLayer].Fit();
2764 cseed[jLayer].UpdateUsed();
2765 cseed[jLayer].ResetClusterIter();
2766 while((cl = cseed[jLayer].NextCluster())){
2767 if(!cl->IsInChamber()) nNotInChamber++;
2768 }
2769 //printf("clusters[%d], used[%d], not in chamber[%d]\n", cseed[jLayer].GetN(), cseed[jLayer].GetNUsed(), nNotInChamber);
2770 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
2771 }
d611c74f 2772 mlayers++;
2773 }
be24510a 2774
2775 if(mlayers < kNSeedPlanes){
980d5a2a 2776 AliDebug(2, Form("Found only %d tracklets out of %d. Skip.", mlayers, kNSeedPlanes));
be24510a 2777 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2778 continue;
2779 }
2780
2781 // temporary exit door for the HLT
4d6aee34 2782 if(fkReconstructor->IsHLT()){
be24510a 2783 // attach clusters to extrapolation chambers
2784 for(int iLayer=0; iLayer<kNPlanes-kNSeedPlanes; iLayer++){
2785 Int_t jLayer = planesExt[iLayer];
2786 if(!(chamber = stack[jLayer])) continue;
980d5a2a 2787 if(!cseed[jLayer].AttachClusters(chamber, kTRUE)) continue;
5f1ae1e7 2788 cseed[jLayer].Fit();
be24510a 2789 }
c79857d5 2790 FitTiltedRiemanConstraint(&cseed[0], GetZ());
4302c900 2791 fTrackQuality[ntracks] = 1.; // dummy value
2792 ntracks++;
218ba867 2793 if(ntracks == kMaxTracksStack) return ntracks;
4302c900 2794 cseed += 6;
2795 continue;
2796 }
2797
be24510a 2798
f29f13a6 2799 // Update Seeds and calculate Likelihood
d611c74f 2800 // fit tracklets and cook likelihood
68f9b6bd 2801 Double_t chi2Vals[4];
2802 chi2Vals[0] = FitTiltedRieman(&cseed[0], kTRUE);
f29f13a6 2803 for(int iLayer=0; iLayer<kNSeedPlanes; iLayer++){
2804 Int_t jLayer = planes[iLayer];
2805 cseed[jLayer].Fit(kTRUE);
2806 }
91834b8d 2807 Double_t like = CookLikelihood(&cseed[0], planes); // to be checked
d611c74f 2808
9e85cb05 2809 if (TMath::Log(1.E-9 + like) < fkRecoParam->GetTrackLikelihood()){
980d5a2a 2810 AliDebug(3, Form("Filter on likelihood %f[%e].", TMath::Log(1.E-9 + like), like));
d611c74f 2811 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2812 continue;
2813 }
2814 //AliInfo(Form("Passed likelihood %f[%e].", TMath::Log(1.E-9 + like), like));
2815
2816 // book preliminary results
2817 seedQuality[ntracks] = like;
2818 fSeedLayer[ntracks] = config;/*sLayer;*/
2819
2820 // attach clusters to the extrapolation seeds
980d5a2a 2821 Int_t elayers(0);
be24510a 2822 for(int iLayer=0; iLayer<kNPlanes-kNSeedPlanes; iLayer++){
2823 Int_t jLayer = planesExt[iLayer];
d611c74f 2824 if(!(chamber = stack[jLayer])) continue;
d611c74f 2825
2826 // fit extrapolated seed
2827 if ((jLayer == 0) && !(cseed[1].IsOK())) continue;
2828 if ((jLayer == 5) && !(cseed[4].IsOK())) continue;
2829 AliTRDseedV1 pseed = cseed[jLayer];
f29f13a6 2830 if(!pseed.AttachClusters(chamber, kTRUE)) continue;
2831 pseed.Fit(kTRUE);
d611c74f 2832 cseed[jLayer] = pseed;
68f9b6bd 2833 chi2Vals[0] = FitTiltedRieman(cseed, kTRUE);
f29f13a6 2834 cseed[jLayer].Fit(kTRUE);
980d5a2a 2835 elayers++;
d611c74f 2836 }
2837
2838 // AliInfo("Extrapolation done.");
2839 // Debug Stream containing all the 6 tracklets
9e85cb05 2840 if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) >= 2 && fkReconstructor->IsDebugStreaming()){
a2fbb6ec 2841 TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
d611c74f 2842 TLinearFitter *tiltedRieman = GetTiltedRiemanFitter();
2843 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2844 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2845 cstreamer << "MakeSeeds1"
2846 << "EventNumber=" << eventNumber
2847 << "CandidateNumber=" << candidateNumber
2848 << "S0.=" << &cseed[0]
2849 << "S1.=" << &cseed[1]
2850 << "S2.=" << &cseed[2]
2851 << "S3.=" << &cseed[3]
2852 << "S4.=" << &cseed[4]
2853 << "S5.=" << &cseed[5]
2854 << "FitterT.=" << tiltedRieman
2855 << "\n";
2856 }
2857
9e85cb05 2858 if(fkRecoParam->HasImproveTracklets()){
68f9b6bd 2859 if(!ImproveSeedQuality(stack, cseed, chi2Vals[0])){
980d5a2a 2860 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
68f9b6bd 2861 AliDebug(3, "ImproveSeedQuality() failed.");
980d5a2a 2862 }
d611c74f 2863 }
d611c74f 2864
68f9b6bd 2865 // do track fitting with vertex constraint
2866 if(fkRecoParam->IsVertexConstrained()) chi2Vals[1] = FitTiltedRiemanConstraint(&cseed[0], GetZ());
2867 else chi2Vals[1] = -1.;
2868 chi2Vals[2] = GetChi2Z(&cseed[0]);
2869 chi2Vals[3] = GetChi2Phi(&cseed[0]);
2870
2871 // calculate track quality
2872 fTrackQuality[ntracks] = CalculateTrackLikelihood(&chi2Vals[0]);
fac58f00 2873
9e85cb05 2874 if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) >= 2 && fkReconstructor->IsDebugStreaming()){
a2fbb6ec 2875 TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
d611c74f 2876 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2877 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2878 TLinearFitter *fitterTC = GetTiltedRiemanFitterConstraint();
2879 TLinearFitter *fitterT = GetTiltedRiemanFitter();
91834b8d 2880 Int_t ncls = 0;
2881 for(Int_t iseed = 0; iseed < kNPlanes; iseed++){
2882 ncls += cseed[iseed].IsOK() ? cseed[iseed].GetN2() : 0;
2883 }
d611c74f 2884 cstreamer << "MakeSeeds2"
2885 << "EventNumber=" << eventNumber
2886 << "CandidateNumber=" << candidateNumber
2887 << "Chi2TR=" << chi2Vals[0]
2888 << "Chi2TC=" << chi2Vals[1]
2889 << "Nlayers=" << mlayers
91834b8d 2890 << "NClusters=" << ncls
d611c74f 2891 << "Like=" << like
2892 << "S0.=" << &cseed[0]
2893 << "S1.=" << &cseed[1]
2894 << "S2.=" << &cseed[2]
2895 << "S3.=" << &cseed[3]
2896 << "S4.=" << &cseed[4]
2897 << "S5.=" << &cseed[5]
d611c74f 2898 << "FitterT.=" << fitterT
2899 << "FitterTC.=" << fitterTC
2900 << "\n";
2901 }
68f9b6bd 2902 if(AliLog::GetDebugLevel("TRD", "AliTRDtrackerV1")){
2903 Double_t pt[]={0., 0.};
2904 for(Int_t il(0); il<kNPlanes; il++){
2905 if(!cseed[il].IsOK()) continue;
2906 pt[0] = GetBz()*kB2C/cseed[il].GetC();
2907 pt[1] = GetBz()*kB2C/cseed[il].GetC(1);
2908 break;
2909 }
2910 AliDebug(2, Form("Candidate[%2d] pt[%7.3f %7.3f] Q[%e]\n"
2911 " [0] x[%6.2f] n[%2d] nu[%d] OK[%c]\n"
2912 " [1] x[%6.2f] n[%2d] nu[%d] OK[%c]\n"
2913 " [2] x[%6.2f] n[%2d] nu[%d] OK[%c]\n"
2914 " [3] x[%6.2f] n[%2d] nu[%d] OK[%c]\n"
2915 " [4] x[%6.2f] n[%2d] nu[%d] OK[%c]\n"
2916 " [5] x[%6.2f] n[%2d] nu[%d] OK[%c]"
2917 , ntracks, pt[0], pt[1], fTrackQuality[ntracks]
2918 ,cseed[0].GetX(), cseed[0].GetN(), cseed[0].GetNUsed(), cseed[0].IsOK()?'y':'n'
2919 ,cseed[1].GetX(), cseed[1].GetN(), cseed[1].GetNUsed(), cseed[1].IsOK()?'y':'n'
2920 ,cseed[2].GetX(), cseed[2].GetN(), cseed[2].GetNUsed(), cseed[2].IsOK()?'y':'n'
2921 ,cseed[3].GetX(), cseed[3].GetN(), cseed[3].GetNUsed(), cseed[3].IsOK()?'y':'n'
2922 ,cseed[4].GetX(), cseed[4].GetN(), cseed[4].GetNUsed(), cseed[4].IsOK()?'y':'n'
2923 ,cseed[5].GetX(), cseed[5].GetN(), cseed[5].GetNUsed(), cseed[5].IsOK()?'y':'n'));
2924 }
d611c74f 2925 ntracks++;
2926 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2927 if(ntracks == kMaxTracksStack){
2928 AliWarning(Form("Number of seeds reached maximum allowed (%d) in stack.", kMaxTracksStack));
2929 return ntracks;
2930 }
2931 cseed += 6;
41702fec 2932 }
2933 }
2934 }
41702fec 2935
2936 return ntracks;
e4f2f73d 2937}
2938
2939//_____________________________________________________________________________
68f9b6bd 2940AliTRDtrackV1* AliTRDtrackerV1::MakeTrack(AliTRDseedV1 * const tracklet)
e4f2f73d 2941{
afa21247 2942//
2943// Build a TRD track out of tracklet candidates
2944//
2945// Parameters :
2946// seeds : array of tracklets
2947// params : array of track parameters as they are estimated by stand alone tracker. 7 elements.
2948// [0] - radial position of the track at reference point
2949// [1] - y position of the fit at [0]
2950// [2] - z position of the fit at [0]
2951// [3] - snp of the first tracklet
2952// [4] - tgl of the first tracklet
2953// [5] - curvature of the Riemann fit - 1/pt
2954// [6] - sector rotation angle
2955//
2956// Output :
2957// The TRD track.
2958//
2959// Initialize the TRD track based on the parameters of the fit and a parametric covariance matrix
2960// (diagonal with constant variance terms TODO - correct parameterization)
2961//
2962// In case of HLT just register the tracklets in the tracker and return values of the Riemann fit. For the
2963// offline case perform a full Kalman filter on the already found tracklets (see AliTRDtrackerV1::FollowBackProlongation()
2964// for details). Do also MC label calculation and PID if propagation successfully.
41702fec 2965
afa21247 2966
41702fec 2967 Double_t alpha = AliTRDgeometry::GetAlpha();
2968 Double_t shift = AliTRDgeometry::GetAlpha()/2.0;
41702fec 2969
68f9b6bd 2970 // find first good tracklet
2971 Int_t idx(0); while(idx<kNPlanes && !tracklet[idx].IsOK()) idx++;
2972 if(idx>2){ AliDebug(1, Form("Found suspect track start @ layer idx[%d]\n"
2973 " %c[0] x0[%f] n[%d] nu[%d] OK[%c]\n"
2974 " %c[1] x0[%f] n[%d] nu[%d] OK[%c]\n"
2975 " %c[2] x0[%f] n[%d] nu[%d] OK[%c]\n"
2976 " %c[3] x0[%f] n[%d] nu[%d] OK[%c]\n"
2977 " %c[4] x0[%f] n[%d] nu[%d] OK[%c]\n"
2978 " %c[5] x0[%f] n[%d] nu[%d] OK[%c]"
2979 ,idx
2980 ,idx==0?'*':' ', tracklet[0].GetX0(), tracklet[0].GetN(), tracklet[0].GetNUsed(), tracklet[0].IsOK()?'y':'n'
2981 ,idx==1?'*':' ', tracklet[1].GetX0(), tracklet[1].GetN(), tracklet[1].GetNUsed(), tracklet[1].IsOK()?'y':'n'
2982 ,idx==2?'*':' ', tracklet[2].GetX0(), tracklet[2].GetN(), tracklet[2].GetNUsed(), tracklet[2].IsOK()?'y':'n'
2983 ,idx==3?'*':' ', tracklet[3].GetX0(), tracklet[3].GetN(), tracklet[3].GetNUsed(), tracklet[3].IsOK()?'y':'n'
2984 ,idx==4?'*':' ', tracklet[4].GetX0(), tracklet[4].GetN(), tracklet[4].GetNUsed(), tracklet[4].IsOK()?'y':'n'
2985 ,idx==5?'*':' ', tracklet[5].GetX0(), tracklet[5].GetN(), tracklet[5].GetNUsed(), tracklet[5].IsOK()?'y':'n'));
2986 return NULL;
2987 }
2988
8def512c 2989 Double_t dx(5.);
2990 Double_t x(tracklet[idx].GetX0() - dx);
68f9b6bd 2991 // Build track parameters
2992 Double_t params[] = {
2993 tracklet[idx].GetYref(0) - dx*tracklet[idx].GetYref(1) // y
2994 ,tracklet[idx].GetZref(0) - dx*tracklet[idx].GetZref(1) // z
2995 ,TMath::Sin(TMath::ATan(tracklet[idx].GetYref(1))) // snp
2996 ,tracklet[idx].GetZref(1) / TMath::Sqrt(1. + tracklet[idx].GetYref(1) * tracklet[idx].GetYref(1)) // tgl
8def512c 2997 ,tracklet[idx].GetC(fkReconstructor->IsHLT()?1:0) // curvature -> 1/pt
68f9b6bd 2998 };
2999 Int_t sector(fGeom->GetSector(tracklet[idx].GetDetector()));
3000
3001 Double_t c[15];
afa21247 3002 c[ 0] = 0.2; // s^2_y
3003 c[ 1] = 0.0; c[ 2] = 2.0; // s^2_z
3004 c[ 3] = 0.0; c[ 4] = 0.0; c[ 5] = 0.02; // s^2_snp
3005 c[ 6] = 0.0; c[ 7] = 0.0; c[ 8] = 0.0; c[ 9] = 0.1; // s^2_tgl
68f9b6bd 3006 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
3007
3008 AliTRDtrackV1 track(tracklet, params, c, x, sector*alpha+shift);
41702fec 3009
4d6aee34 3010 AliTRDseedV1 *ptrTracklet = NULL;
9887cc9f 3011
3012 // skip Kalman filter for HLT
5f1ae1e7 3013 if(/*fkReconstructor->IsHLT()*/kFALSE){
9887cc9f 3014 for (Int_t jLayer = 0; jLayer < AliTRDgeometry::kNlayer; jLayer++) {
3015 track.UnsetTracklet(jLayer);
68f9b6bd 3016 ptrTracklet = &tracklet[jLayer];
9887cc9f 3017 if(!ptrTracklet->IsOK()) continue;
5f1ae1e7 3018 if(TMath::Abs(ptrTracklet->GetYref(1) - ptrTracklet->GetYfit(1)) >= .2) continue; // check this condition with Marian
9887cc9f 3019 ptrTracklet = SetTracklet(ptrTracklet);
f29f13a6 3020 ptrTracklet->UseClusters();
91834b8d 3021 track.SetTracklet(ptrTracklet, fTracklets->GetEntriesFast()-1);
3022 }
d78d7df0 3023 AliTRDtrackV1 *ptrTrack = SetTrack(&track);
799e38d7 3024 ptrTrack->CookPID();
5f1ae1e7 3025 ptrTrack->CookLabel(.9);
4d6aee34 3026 ptrTrack->SetReconstructor(fkReconstructor);
d78d7df0 3027 return ptrTrack;
91834b8d 3028 }
393fda1c 3029
b1135f96 3030 // prevent the error message in AliTracker::MeanMaterialBudget: "start point out of geometry"
68f9b6bd 3031 if(TMath::Abs(track.GetX()) + TMath::Abs(track.GetY()) + TMath::Abs(track.GetZ()) > 10000) return NULL;
17e0e535 3032
d20df6fc 3033 track.ResetCovariance(1);
e79f8eb0 3034 Int_t nc = TMath::Abs(FollowBackProlongation(track));
9e85cb05 3035 if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 5 && fkReconstructor->IsDebugStreaming()){
393fda1c 3036 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
3037 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
3038 Double_t p[5]; // Track Params for the Debug Stream
68f9b6bd 3039 track.GetExternalParameters(x, p);
a2fbb6ec 3040 TTreeSRedirector &cs = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
393fda1c 3041 cs << "MakeTrack"
3042 << "EventNumber=" << eventNumber
3043 << "CandidateNumber=" << candidateNumber
3044 << "nc=" << nc
68f9b6bd 3045 << "X=" << x
393fda1c 3046 << "Y=" << p[0]
3047 << "Z=" << p[1]
3048 << "snp=" << p[2]
3049 << "tnd=" << p[3]
3050 << "crv=" << p[4]
68f9b6bd 3051 << "Yin=" << params[0]
3052 << "Zin=" << params[1]
3053 << "snpin=" << params[2]
3054 << "tndin=" << params[3]
3055 << "crvin=" << params[4]
393fda1c 3056 << "track.=" << &track
3057 << "\n";
3058 }
68f9b6bd 3059 if (nc < 30){
3060 UnsetTrackletsTrack(&track);
3061 return NULL;
3062 }
d20df6fc 3063 AliTRDtrackV1 *ptrTrack = SetTrack(&track);
4d6aee34 3064 ptrTrack->SetReconstructor(fkReconstructor);
48f8adf3 3065 ptrTrack->CookLabel(.9);
68f9b6bd 3066 for(Int_t il(kNPlanes); il--;){
3067 if(!(ptrTracklet = ptrTrack->GetTracklet(il))) continue;
3068 ptrTracklet->UseClusters();
3069 }
3070
d20df6fc 3071 // computes PID for track
3072 ptrTrack->CookPID();
3073 // update calibration references using this track
48f8adf3 3074 AliTRDCalibraFillHisto *calibra = AliTRDCalibraFillHisto::Instance();
3075 if (!calibra){
3076 AliInfo("Could not get Calibra instance\n");
3077 if(calibra->GetHisto2d()) calibra->UpdateHistogramsV1(ptrTrack);
3078 }
d20df6fc 3079 return ptrTrack;
e4f2f73d 3080}
3081
0906e73e 3082
3083//____________________________________________________________________
68f9b6bd 3084Bool_t AliTRDtrackerV1::ImproveSeedQuality(AliTRDtrackingChamber **stack, AliTRDseedV1 *cseed, Double_t &chi2)
e4f2f73d 3085{
41702fec 3086 //
3087 // Sort tracklets according to "quality" and try to "improve" the first 4 worst
3088 //
3089 // Parameters :
3090 // layers : Array of propagation layers for a stack/supermodule
3091 // cseed : Array of 6 seeding tracklets which has to be improved
3092 //
f29f13a6 3093 // Output :
41702fec 3094 // cssed : Improved seeds
3095 //
3096 // Detailed description
3097 //
3098 // Iterative procedure in which new clusters are searched for each
3099 // tracklet seed such that the seed quality (see AliTRDseed::GetQuality())
3100 // can be maximized. If some optimization is found the old seeds are replaced.
3101 //
3102 // debug level: 7
3103 //
3104
3105 // make a local working copy
4d6aee34 3106 AliTRDtrackingChamber *chamber = NULL;
980d5a2a 3107 AliTRDseedV1 bseed[AliTRDgeometry::kNlayer];
3108
68f9b6bd 3109 Float_t quality(1.e3),
980d5a2a 3110 lQuality[] = {1.e3, 1.e3, 1.e3, 1.e3, 1.e3, 1.e3};
3111 Int_t rLayers(0);
3112 for(Int_t jLayer=AliTRDgeometry::kNlayer; jLayer--;){
3113 bseed[jLayer] = cseed[jLayer];
3114 if(!bseed[jLayer].IsOK()) continue;
3115 rLayers++;
3116 lQuality[jLayer] = bseed[jLayer].GetQuality(kTRUE);
3117 quality += lQuality[jLayer];
3118 }
68f9b6bd 3119 quality /= rLayers;
3120 AliDebug(2, Form("Start N[%d] Q[%f] chi2[%f]", rLayers, quality, chi2));
41702fec 3121
3122 for (Int_t iter = 0; iter < 4; iter++) {
980d5a2a 3123 // Try better cluster set
3124 Int_t nLayers(0); Float_t qualitynew(0.);
3125 Int_t indexes[6];
3126 TMath: