Corrected default values.
[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
9e85cb05 362 if (fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 0 &&
363fkRecoParam->IsOverPtThreshold(track.Pt())){
224f357f 364 AliTRDtrackV1 *calibTrack = new AliTRDtrackV1(track);
365 calibTrack->SetOwner();
366 seed->AddCalibObject(calibTrack);
367 }
368 //update ESD track
050875b0 369 seed->UpdateTrackParams(&track, AliESDtrack::kTRDout);
370 track.UpdateESDtrack(seed);
41702fec 371 }
372
27fbeba8 373 if ((TMath::Abs(track.GetC(track.GetBz()) - p4) / TMath::Abs(p4) < 0.2) ||(track.Pt() > 0.8)) {
e3cf3d02 374
41702fec 375 // Make backup for back propagation
41702fec 376 Int_t foundClr = track.GetNumberOfClusters();
377 if (foundClr >= foundMin) {
41702fec 378 track.CookLabel(1. - fgkLabelFraction);
f29f13a6 379 //if(track.GetBackupTrack()) UseClusters(track.GetBackupTrack());
41702fec 380
381 // Sign only gold tracks
382 if (track.GetChi2() / track.GetNumberOfClusters() < 4) {
f29f13a6 383 //if ((seed->GetKinkIndex(0) == 0) && (track.Pt() < 1.5)) UseClusters(&track);
41702fec 384 }
385 Bool_t isGold = kFALSE;
386
387 // Full gold track
388 if (track.GetChi2() / track.GetNumberOfClusters() < 5) {
389 if (track.GetBackupTrack()) seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup);
b453ef55 390 nBacked++;
41702fec 391 isGold = kTRUE;
392 }
393
394 // Almost gold track
395 if ((!isGold) && (track.GetNCross() == 0) && (track.GetChi2() / track.GetNumberOfClusters() < 7)) {
396 //seed->UpdateTrackParams(track, AliESDtrack::kTRDbackup);
397 if (track.GetBackupTrack()) seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup);
b453ef55 398 nBacked++;
41702fec 399 isGold = kTRUE;
400 }
401
402 if ((!isGold) && (track.GetBackupTrack())) {
403 if ((track.GetBackupTrack()->GetNumberOfClusters() > foundMin) && ((track.GetBackupTrack()->GetChi2()/(track.GetBackupTrack()->GetNumberOfClusters()+1)) < 7)) {
404 seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup);
b453ef55 405 nBacked++;
41702fec 406 isGold = kTRUE;
407 }
408 }
41702fec 409 }
410 }
411
eb2b4f91 412 // Propagation to the TOF
413 if(!(seed->GetStatus()&AliESDtrack::kTRDStop)) {
414 Int_t sm = track.GetSector();
415 // default value in case we have problems with the geometry.
416 Double_t xtof = 371.;
417 //Calculate radial position of the beginning of the TOF
418 //mother volume. In order to avoid mixing of the TRD
419 //and TOF modules some hard values are needed. This are:
420 //1. The path to the TOF module.
421 //2. The width of the TOF (29.05 cm)
422 //(with the help of Annalisa de Caro Mar-17-2009)
423 if(gGeoManager){
424 gGeoManager->cd(Form("/ALIC_1/B077_1/BSEGMO%d_1/BTOF%d_1", sm, sm));
4d6aee34 425 TGeoHMatrix *m = NULL;
eb2b4f91 426 Double_t loc[]={0., 0., -.5*29.05}, glob[3];
427
428 if((m=gGeoManager->GetCurrentMatrix())){
429 m->LocalToMaster(loc, glob);
430 xtof = TMath::Sqrt(glob[0]*glob[0]+glob[1]*glob[1]);
431 }
41702fec 432 }
672b48bd 433 if(xtof > (fgkMaxStep + track.GetX()) && !PropagateToX(track, xtof, fgkMaxStep)){
434 seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
435 continue;
436 }
437 if(!AdjustSector(&track)){
438 seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
439 continue;
440 }
441 if(TMath::Abs(track.GetSnp()) > fgkMaxSnp){
442 seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
443 continue;
444 }
050875b0 445 //seed->UpdateTrackParams(&track, AliESDtrack::kTRDout);
eb2b4f91 446 // TODO obsolete - delete
447 seed->SetTRDQuality(track.StatusForTOF());
41702fec 448 }
41702fec 449 seed->SetTRDBudget(track.GetBudget(0));
450 }
d611c74f 451 if(index) delete [] index;
452 if(quality) delete [] quality;
41702fec 453
d4cf71ca 454 AliInfo(Form("Number of seeds: TPCout[%d] TRDin[%d]", nTPCseeds, nTRDseeds));
b453ef55 455 AliInfo(Form("Number of tracks: TRDout[%d] TRDbackup[%d]", nFound, nBacked));
d4cf71ca 456
d611c74f 457 // run stand alone tracking
4d6aee34 458 if (fkReconstructor->IsSeeding()) Clusters2Tracks(event);
41702fec 459
460 return 0;
0906e73e 461}
462
463
464//____________________________________________________________________
465Int_t AliTRDtrackerV1::RefitInward(AliESDEvent *event)
466{
41702fec 467 //
468 // Refits tracks within the TRD. The ESD event is expected to contain seeds
469 // at the outer part of the TRD.
470 // The tracks are propagated to the innermost time bin
471 // of the TRD and the ESD event is updated
472 // Origin: Thomas KUHR (Thomas.Kuhr@cern.ch)
473 //
474
475 Int_t nseed = 0; // contor for loaded seeds
476 Int_t found = 0; // contor for updated TRD tracks
477
478
e3d45279 479 if(!fClusters || !fClusters->GetEntriesFast()){
480 AliInfo("No TRD clusters");
481 return 0;
482 }
41702fec 483 AliTRDtrackV1 track;
484 for (Int_t itrack = 0; itrack < event->GetNumberOfTracks(); itrack++) {
485 AliESDtrack *seed = event->GetTrack(itrack);
050875b0 486 ULong_t status = seed->GetStatus();
41702fec 487
050875b0 488 new(&track) AliTRDtrackV1(*seed);
41702fec 489 if (track.GetX() < 270.0) {
490 seed->UpdateTrackParams(&track, AliESDtrack::kTRDbackup);
491 continue;
492 }
493
e3cf3d02 494 // reject tracks which failed propagation in the TRD or
495 // are produced by the TRD stand alone tracker
e3cf3d02 496 if(!(status & AliESDtrack::kTRDout)) continue;
497 if(!(status & AliESDtrack::kTRDin)) continue;
41702fec 498 nseed++;
499
500 track.ResetCovariance(50.0);
501
502 // do the propagation and processing
503 Bool_t kUPDATE = kFALSE;
504 Double_t xTPC = 250.0;
505 if(FollowProlongation(track)){
e3cf3d02 506 // Update the friend track
9e85cb05 507 if (fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 0 && fkRecoParam->IsOverPtThreshold(track.Pt())){
4d6aee34 508 TObject *o = NULL; Int_t ic = 0;
509 AliTRDtrackV1 *calibTrack = NULL;
e3cf3d02 510 while((o = seed->GetCalibObject(ic++))){
511 if(!(calibTrack = dynamic_cast<AliTRDtrackV1*>(o))) continue;
a310e49b 512 calibTrack->SetTrackOut(&track);
e3cf3d02 513 }
41702fec 514 }
a310e49b 515
516 // Prolongate to TPC
517 if (PropagateToX(track, xTPC, fgkMaxStep)) { // -with update
518 seed->UpdateTrackParams(&track, AliESDtrack::kTRDrefit);
519 found++;
520 kUPDATE = kTRUE;
521 }
e3cf3d02 522 }
41702fec 523
524 // Prolongate to TPC without update
525 if(!kUPDATE) {
526 AliTRDtrackV1 tt(*seed);
e3cf3d02 527 if (PropagateToX(tt, xTPC, fgkMaxStep)) seed->UpdateTrackParams(&tt, AliESDtrack::kTRDbackup);
41702fec 528 }
529 }
980d5a2a 530 AliInfo(Form("Number of seeds: TRDout[%d]", nseed));
531 AliInfo(Form("Number of tracks: TRDrefit[%d]", found));
41702fec 532
533 return 0;
0906e73e 534}
535
0906e73e 536//____________________________________________________________________
537Int_t AliTRDtrackerV1::FollowProlongation(AliTRDtrackV1 &t)
538{
41702fec 539 // Extrapolates the TRD track in the TPC direction.
540 //
541 // Parameters
542 // t : the TRD track which has to be extrapolated
543 //
544 // Output
545 // number of clusters attached to the track
546 //
547 // Detailed description
548 //
549 // Starting from current radial position of track <t> this function
550 // extrapolates the track through the 6 TRD layers. The following steps
551 // are being performed for each plane:
552 // 1. prepare track:
553 // a. get plane limits in the local x direction
554 // b. check crossing sectors
555 // c. check track inclination
556 // 2. search tracklet in the tracker list (see GetTracklet() for details)
557 // 3. evaluate material budget using the geo manager
558 // 4. propagate and update track using the tracklet information.
559 //
560 // Debug level 2
561 //
562
563 Int_t nClustersExpected = 0;
e3cf3d02 564 for (Int_t iplane = kNPlanes; iplane--;) {
17896e82 565 Int_t index(-1);
41702fec 566 AliTRDseedV1 *tracklet = GetTracklet(&t, iplane, index);
17896e82 567 AliDebug(2, Form("Tracklet[%p] ly[%d] idx[%d]", (void*)tracklet, iplane, index));
41702fec 568 if(!tracklet) continue;
980d5a2a 569 if(!tracklet->IsOK()){
570 AliDebug(1, Form("Tracklet Det[%d] !OK", tracklet->GetDetector()));
571 continue;
572 }
e3cf3d02 573 Double_t x = tracklet->GetX();//GetX0();
41702fec 574 // reject tracklets which are not considered for inward refit
575 if(x > t.GetX()+fgkMaxStep) continue;
576
577 // append tracklet to track
578 t.SetTracklet(tracklet, index);
579
580 if (x < (t.GetX()-fgkMaxStep) && !PropagateToX(t, x+fgkMaxStep, fgkMaxStep)) break;
581 if (!AdjustSector(&t)) break;
582
583 // Start global position
584 Double_t xyz0[3];
585 t.GetXYZ(xyz0);
586
587 // End global position
588 Double_t alpha = t.GetAlpha(), y, z;
589 if (!t.GetProlongation(x,y,z)) break;
590 Double_t xyz1[3];
591 xyz1[0] = x * TMath::Cos(alpha) - y * TMath::Sin(alpha);
592 xyz1[1] = x * TMath::Sin(alpha) + y * TMath::Cos(alpha);
593 xyz1[2] = z;
594
51a23065 595 Double_t length = TMath::Sqrt(
596 (xyz0[0]-xyz1[0])*(xyz0[0]-xyz1[0]) +
597 (xyz0[1]-xyz1[1])*(xyz0[1]-xyz1[1]) +
598 (xyz0[2]-xyz1[2])*(xyz0[2]-xyz1[2])
599 );
600 if(length>0.){
601 // Get material budget
602 Double_t param[7];
603 if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param)<=0.) break;
604 Double_t xrho= param[0]*param[4];
605 Double_t xx0 = param[1]; // Get mean propagation parameters
606
607 // Propagate and update
608 t.PropagateTo(x, xx0, xrho);
609 if (!AdjustSector(&t)) break;
610 }
e3cf3d02 611
b72f4eaf 612 Double_t cov[3]; tracklet->GetCovAt(x, cov);
613 Double_t p[2] = { tracklet->GetY(), tracklet->GetZ()};
614 Double_t chi2 = ((AliExternalTrackParam)t).GetPredictedChi2(p, cov);
615 if (chi2 < 1e+10 && t.Update(p, cov, chi2)){
41702fec 616 nClustersExpected += tracklet->GetN();
617 }
618 }
619
9e85cb05 620 if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 1){
41702fec 621 Int_t index;
51a23065 622 for(int iplane=0; iplane<AliTRDgeometry::kNlayer; iplane++){
41702fec 623 AliTRDseedV1 *tracklet = GetTracklet(&t, iplane, index);
624 if(!tracklet) continue;
625 t.SetTracklet(tracklet, index);
626 }
627
a2fbb6ec 628 if(fkReconstructor->IsDebugStreaming()){
629 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
630 TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
631 AliTRDtrackV1 track(t);
632 track.SetOwner();
633 cstreamer << "FollowProlongation"
634 << "EventNumber=" << eventNumber
635 << "ncl=" << nClustersExpected
636 << "track.=" << &track
637 << "\n";
638 }
41702fec 639 }
41702fec 640 return nClustersExpected;
0906e73e 641
642}
643
644//_____________________________________________________________________________
645Int_t AliTRDtrackerV1::FollowBackProlongation(AliTRDtrackV1 &t)
646{
afa21247 647// Extrapolates/Build the TRD track in the TOF direction.
648//
649// Parameters
650// t : the TRD track which has to be extrapolated
651//
652// Output
653// number of clusters attached to the track
654//
655// Starting from current radial position of track <t> this function
656// extrapolates the track through the 6 TRD layers. The following steps
657// are being performed for each plane:
658// 1. Propagate track to the entrance of the next chamber:
659// - get chamber limits in the radial direction
660// - check crossing sectors
661// - check track inclination
662// - check track prolongation against boundary conditions (see exclusion boundaries on AliTRDgeometry::IsOnBoundary())
663// 2. Build tracklet (see AliTRDseed::AttachClusters() for details) for this layer if needed. If only
664// Kalman filter is needed and tracklets are already linked to the track this step is skipped.
665// 3. Fit tracklet using the information from the Kalman filter.
666// 4. Propagate and update track at reference radial position of the tracklet.
667// 5. Register tracklet with the tracker and track; update pulls monitoring.
668//
669// Observation
2a3191bb 670// 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:
671// - AliTRDtrackV1::kProlongation : track prolongation failed
672// - AliTRDtrackV1::kPropagation : track prolongation failed
673// - AliTRDtrackV1::kAdjustSector : failed during sector crossing
674// - AliTRDtrackV1::kSnp : too large bending
675// - AliTRDtrackV1::kTrackletInit : fail to initialize tracklet
676// - AliTRDtrackV1::kUpdate : fail to attach clusters or fit the tracklet
677// - AliTRDtrackV1::kUnknown : anything which is not covered before
afa21247 678// 2. By default the status of the track before first TRD update is saved.
679//
680// Debug level 2
681//
682// Author
683// Alexandru Bercuci <A.Bercuci@gsi.de>
684//
41702fec 685
eb2b4f91 686 Int_t n = 0;
687 Double_t driftLength = .5*AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick();
4d6aee34 688 AliTRDtrackingChamber *chamber = NULL;
41702fec 689
9e85cb05 690 Int_t debugLevel = fkReconstructor->IsDebugStreaming() ? fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) : 0;
7c3eecb8 691 TTreeSRedirector *cstreamer = fkReconstructor->IsDebugStreaming() ? fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker) : 0x0;
692
68f9b6bd 693 Bool_t kStoreIn(kTRUE), //
694 kPropagateIn(kTRUE), //
695 kStandAlone(kFALSE), // toggle tracker awarness of stand alone seeding
696 kUseTRD(fkRecoParam->IsOverPtThreshold(t.Pt()));// use TRD measurment to update Kalman
697
698 Int_t startLayer(0);
4d6aee34 699 AliTRDseedV1 tracklet, *ptrTracklet = NULL;
68f9b6bd 700 // Special case for stand alone tracking
701 // - store all tracklets found by seeding
702 // - start propagation from first tracklet found
181d2c97 703 AliTRDseedV1 *tracklets[kNPlanes];
704 memset(tracklets, 0, sizeof(AliTRDseedV1 *) * kNPlanes);
68f9b6bd 705 for(Int_t ip(kNPlanes); ip--;){
706 if(!(tracklets[ip] = t.GetTracklet(ip))) continue;
181d2c97 707 t.UnsetTracklet(ip);
68f9b6bd 708 if(tracklets[ip]->IsOK()) startLayer=ip;
709 kStandAlone = kTRUE;
181d2c97 710 }
68f9b6bd 711 AliDebug(4, Form("SA[%c] Start[%d]\n"
712 " [0]idx[%d] traklet[%p]\n"
713 " [1]idx[%d] traklet[%p]\n"
714 " [2]idx[%d] traklet[%p]\n"
715 " [3]idx[%d] traklet[%p]\n"
716 " [4]idx[%d] traklet[%p]\n"
717 " [5]idx[%d] traklet[%p]"
718 , kStandAlone?'y':'n', startLayer
719 , t.GetTrackletIndex(0), (void*)tracklets[0]
720 , t.GetTrackletIndex(1), (void*)tracklets[1]
721 , t.GetTrackletIndex(2), (void*)tracklets[2]
722 , t.GetTrackletIndex(3), (void*)tracklets[3]
723 , t.GetTrackletIndex(4), (void*)tracklets[4]
724 , t.GetTrackletIndex(5), (void*)tracklets[5]));
e3cf3d02 725
053767a4 726 // Loop through the TRD layers
4d6aee34 727 TGeoHMatrix *matrix = NULL;
eb2b4f91 728 Double_t x, y, z;
68f9b6bd 729 for (Int_t ily=startLayer, sm=-1, stk=-1, det=-1; ily < AliTRDgeometry::kNlayer; ily++) {
1bd708e3 730 AliDebug(2, Form("Propagate to x[%d] = %7.2f", ily, fR[ily]));
731
eb2b4f91 732 // rough estimate of the entry point
733 if (!t.GetProlongation(fR[ily], y, z)){
734 n=-1;
735 t.SetStatus(AliTRDtrackV1::kProlongation);
1bd708e3 736 AliDebug(4, Form("Failed Rough Prolongation to ly[%d] x[%7.2f] y[%7.2f] z[%7.2f]", ily, fR[ily], y, z));
eb2b4f91 737 break;
738 }
41702fec 739
eb2b4f91 740 // find sector / stack / detector
741 sm = t.GetSector();
742 // TODO cross check with y value !
743 stk = fGeom->GetStack(z, ily);
744 det = stk>=0 ? AliTRDgeometry::GetDetector(ily, stk, sm) : -1;
4d6aee34 745 matrix = det>=0 ? fGeom->GetClusterMatrix(det) : NULL;
1bd708e3 746 AliDebug(3, Form("Propagate to det[%3d]", det));
eb2b4f91 747
748 // check if supermodule/chamber is installed
749 if( !fGeom->GetSMstatus(sm) ||
750 stk<0. ||
751 fGeom->IsHole(ily, stk, sm) ||
752 !matrix ){
1bd708e3 753 AliDebug(4, Form("Missing Geometry ly[%d]. Guess radial position", ily));
eb2b4f91 754 // propagate to the default radial position
755 if(fR[ily] > (fgkMaxStep + t.GetX()) && !PropagateToX(t, fR[ily], fgkMaxStep)){
756 n=-1;
757 t.SetStatus(AliTRDtrackV1::kPropagation);
1bd708e3 758 AliDebug(4, "Failed Propagation [Missing Geometry]");
41702fec 759 break;
760 }
eb2b4f91 761 if(!AdjustSector(&t)){
762 n=-1;
763 t.SetStatus(AliTRDtrackV1::kAdjustSector);
1bd708e3 764 AliDebug(4, "Failed Adjust Sector [Missing Geometry]");
eb2b4f91 765 break;
766 }
767 if(TMath::Abs(t.GetSnp()) > fgkMaxSnp){
768 n=-1;
769 t.SetStatus(AliTRDtrackV1::kSnp);
1bd708e3 770 AliDebug(4, "Failed Max Snp [Missing Geometry]");
eb2b4f91 771 break;
772 }
773 t.SetStatus(AliTRDtrackV1::kGeometry, ily);
41702fec 774 continue;
775 }
e3cf3d02 776
eb2b4f91 777 // retrieve rotation matrix for the current chamber
778 Double_t loc[] = {AliTRDgeometry::AnodePos()- driftLength, 0., 0.};
779 Double_t glb[] = {0., 0., 0.};
780 matrix->LocalToMaster(loc, glb);
781
782 // Propagate to the radial distance of the current layer
783 x = glb[0] - fgkMaxStep;
784 if(x > (fgkMaxStep + t.GetX()) && !PropagateToX(t, x, fgkMaxStep)){
785 n=-1;
786 t.SetStatus(AliTRDtrackV1::kPropagation);
1bd708e3 787 AliDebug(4, Form("Failed Initial Propagation to x[%7.2f]", x));
eb2b4f91 788 break;
789 }
790 if(!AdjustSector(&t)){
791 n=-1;
792 t.SetStatus(AliTRDtrackV1::kAdjustSector);
1bd708e3 793 AliDebug(4, "Failed Adjust Sector Start");
eb2b4f91 794 break;
795 }
796 if(TMath::Abs(t.GetSnp()) > fgkMaxSnp) {
797 n=-1;
798 t.SetStatus(AliTRDtrackV1::kSnp);
1bd708e3 799 AliDebug(4, Form("Failed Max Snp[%f] MaxSnp[%f]", t.GetSnp(), fgkMaxSnp));
eb2b4f91 800 break;
801 }
4d6aee34 802 Bool_t doRecalculate = kFALSE;
eb2b4f91 803 if(sm != t.GetSector()){
804 sm = t.GetSector();
4d6aee34 805 doRecalculate = kTRUE;
eb2b4f91 806 }
807 if(stk != fGeom->GetStack(z, ily)){
808 stk = fGeom->GetStack(z, ily);
4d6aee34 809 doRecalculate = kTRUE;
eb2b4f91 810 }
4d6aee34 811 if(doRecalculate){
eb2b4f91 812 det = AliTRDgeometry::GetDetector(ily, stk, sm);
813 if(!(matrix = fGeom->GetClusterMatrix(det))){
814 t.SetStatus(AliTRDtrackV1::kGeometry, ily);
1bd708e3 815 AliDebug(4, Form("Failed Geometry Matrix ly[%d]", ily));
eb2b4f91 816 continue;
817 }
818 matrix->LocalToMaster(loc, glb);
819 x = glb[0] - fgkMaxStep;
820 }
821
822 // check if track is well inside fiducial volume
823 if (!t.GetProlongation(x+fgkMaxStep, y, z)) {
824 n=-1;
825 t.SetStatus(AliTRDtrackV1::kProlongation);
1bd708e3 826 AliDebug(4, Form("Failed Prolongation to x[%7.2f] y[%7.2f] z[%7.2f]", x+fgkMaxStep, y, z));
eb2b4f91 827 break;
828 }
829 if(fGeom->IsOnBoundary(det, y, z, .5)){
830 t.SetStatus(AliTRDtrackV1::kBoundary, ily);
1bd708e3 831 AliDebug(4, "Failed Track on Boundary");
eb2b4f91 832 continue;
833 }
834 // mark track as entering the FIDUCIAL volume of TRD
e3cf3d02 835 if(kStoreIn){
a310e49b 836 t.SetTrackIn();
e3cf3d02 837 kStoreIn = kFALSE;
838 }
b1957d3c 839
eb2b4f91 840 ptrTracklet = tracklets[ily];
841 if(!ptrTracklet){ // BUILD TRACKLET
1bd708e3 842 AliDebug(3, Form("Building tracklet det[%d]", det));
eb2b4f91 843 // check data in supermodule
844 if(!fTrSec[sm].GetNChambers()){
845 t.SetStatus(AliTRDtrackV1::kNoClusters, ily);
1bd708e3 846 AliDebug(4, "Failed NoClusters");
eb2b4f91 847 continue;
848 }
849 if(fTrSec[sm].GetX(ily) < 1.){
850 t.SetStatus(AliTRDtrackV1::kNoClusters, ily);
1bd708e3 851 AliDebug(4, "Failed NoX");
eb2b4f91 852 continue;
853 }
854
855 // check data in chamber
856 if(!(chamber = fTrSec[sm].GetChamber(stk, ily))){
857 t.SetStatus(AliTRDtrackV1::kNoClusters, ily);
1bd708e3 858 AliDebug(4, "Failed No Detector");
eb2b4f91 859 continue;
860 }
9e85cb05 861 if(chamber->GetNClusters() < fgNTimeBins*fkRecoParam ->GetFindableClusters()){
eb2b4f91 862 t.SetStatus(AliTRDtrackV1::kNoClusters, ily);
1bd708e3 863 AliDebug(4, "Failed Not Enough Clusters in Detector");
eb2b4f91 864 continue;
865 }
866 // build tracklet
867 ptrTracklet = new(&tracklet) AliTRDseedV1(det);
4d6aee34 868 ptrTracklet->SetReconstructor(fkReconstructor);
eb2b4f91 869 ptrTracklet->SetKink(t.IsKink());
870 ptrTracklet->SetPadPlane(fGeom->GetPadPlane(ily, stk));
871 ptrTracklet->SetX0(glb[0]+driftLength);
872 if(!tracklet.Init(&t)){
873 n=-1;
874 t.SetStatus(AliTRDtrackV1::kTrackletInit);
1bd708e3 875 AliDebug(4, "Failed Tracklet Init");
eb2b4f91 876 break;
877 }
878 if(!tracklet.AttachClusters(chamber, kTRUE)){
879 t.SetStatus(AliTRDtrackV1::kNoAttach, ily);
7c3eecb8 880 if(debugLevel>3){
881 AliTRDseedV1 trackletCp(*ptrTracklet);
882 UChar_t status(t.GetStatusTRD(ily));
883 (*cstreamer) << "FollowBackProlongation2"
884 <<"status=" << status
885 <<"tracklet.=" << &trackletCp
886 << "\n";
887 }
1bd708e3 888 AliDebug(4, "Failed Attach Clusters");
eb2b4f91 889 continue;
890 }
1bd708e3 891 AliDebug(3, Form("Number of Clusters in Tracklet: %d", tracklet.GetN()));
9e85cb05 892 if(tracklet.GetN() < fgNTimeBins*fkRecoParam ->GetFindableClusters()){
eb2b4f91 893 t.SetStatus(AliTRDtrackV1::kNoClustersTracklet, ily);
7c3eecb8 894 if(debugLevel>3){
895 AliTRDseedV1 trackletCp(*ptrTracklet);
896 UChar_t status(t.GetStatusTRD(ily));
897 (*cstreamer) << "FollowBackProlongation2"
898 <<"status=" << status
899 <<"tracklet.=" << &trackletCp
900 << "\n";
901 }
1bd708e3 902 AliDebug(4, "Failed N Clusters Attached");
eb2b4f91 903 continue;
904 }
905 ptrTracklet->UpdateUsed();
0217fcd0 906 } else AliDebug(2, Form("Use external tracklet ly[%d]", ily));
eb2b4f91 907 // propagate track to the radial position of the tracklet
68f9b6bd 908
eb2b4f91 909 // fit tracklet no tilt correction
910 if(!ptrTracklet->Fit(kFALSE)){
911 t.SetStatus(AliTRDtrackV1::kNoFit, ily);
1bd708e3 912 AliDebug(4, "Failed Tracklet Fit");
eb2b4f91 913 continue;
914 }
915 x = ptrTracklet->GetX(); //GetX0();
916 if(x > (fgkMaxStep + t.GetX()) && !PropagateToX(t, x, fgkMaxStep)) {
917 n=-1;
918 t.SetStatus(AliTRDtrackV1::kPropagation);
1bd708e3 919 AliDebug(4, Form("Failed Propagation to Tracklet x[%7.2f]", x));
eb2b4f91 920 break;
921 }
922 if(!AdjustSector(&t)) {
923 n=-1;
924 t.SetStatus(AliTRDtrackV1::kAdjustSector);
1bd708e3 925 AliDebug(4, "Failed Adjust Sector");
eb2b4f91 926 break;
41702fec 927 }
eb2b4f91 928 if(TMath::Abs(t.GetSnp()) > fgkMaxSnp) {
929 n=-1;
930 t.SetStatus(AliTRDtrackV1::kSnp);
1bd708e3 931 AliDebug(4, Form("Failed Max Snp[%f] MaxSnp[%f]", t.GetSnp(), fgkMaxSnp));
eb2b4f91 932 break;
933 }
81a6494d 934 if(kPropagateIn){
a310e49b 935 t.SetTrackIn();
81a6494d 936 kPropagateIn = kFALSE;
937 }
b72f4eaf 938 Double_t cov[3]; ptrTracklet->GetCovAt(x, cov);
939 Double_t p[2] = { ptrTracklet->GetY(), ptrTracklet->GetZ()};
940 Double_t chi2 = ((AliExternalTrackParam)t).GetPredictedChi2(p, cov);
6e39bde4 941 // update Kalman with the TRD measurement
b72f4eaf 942 if(chi2>1e+10){ // TODO
eb2b4f91 943 t.SetStatus(AliTRDtrackV1::kChi2, ily);
7c3eecb8 944 if(debugLevel > 2){
945 UChar_t status(t.GetStatusTRD());
946 AliTRDseedV1 trackletCp(*ptrTracklet);
947 AliTRDtrackV1 trackCp(t);
948 trackCp.SetOwner();
949 (*cstreamer) << "FollowBackProlongation1"
950 << "status=" << status
951 << "tracklet.=" << &trackletCp
952 << "track.=" << &trackCp
953 << "\n";
954 }
1bd708e3 955 AliDebug(4, Form("Failed Chi2[%f]", chi2));
eb2b4f91 956 continue;
957 }
b06a50a5 958 if(!t.Update(p, cov, chi2, kUseTRD)) {
eb2b4f91 959 n=-1;
960 t.SetStatus(AliTRDtrackV1::kUpdate);
7c3eecb8 961 if(debugLevel > 2){
962 UChar_t status(t.GetStatusTRD());
963 AliTRDseedV1 trackletCp(*ptrTracklet);
964 AliTRDtrackV1 trackCp(t);
965 trackCp.SetOwner();
966 (*cstreamer) << "FollowBackProlongation1"
967 << "status=" << status
968 << "tracklet.=" << &trackletCp
969 << "track.=" << &trackCp
970 << "\n";
971 }
1bd708e3 972 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 973 break;
974 }
68f9b6bd 975 if(!kStandAlone) ptrTracklet->UseClusters();
b72f4eaf 976 // fill residuals ?!
977 AliTracker::FillResiduals(&t, p, cov, ptrTracklet->GetVolumeId());
978
eb2b4f91 979
980 // load tracklet to the tracker
16cca13f 981 ptrTracklet->Update(&t);
eb2b4f91 982 ptrTracklet = SetTracklet(ptrTracklet);
17896e82 983 Int_t index(fTracklets->GetEntriesFast()-1);
984 t.SetTracklet(ptrTracklet, index);
eb2b4f91 985 n += ptrTracklet->GetN();
17896e82 986 AliDebug(2, Form("Setting Tracklet[%d] @ Idx[%d]", ily, index));
eb2b4f91 987
41702fec 988 // Reset material budget if 2 consecutive gold
eb2b4f91 989// if(ilayer>0 && t.GetTracklet(ilayer-1) && ptrTracklet->GetN() + t.GetTracklet(ilayer-1)->GetN() > 20) t.SetBudget(2, 0.);
41702fec 990
991 // Make backup of the track until is gold
b453ef55 992 Int_t failed(0);
68f9b6bd 993 if(!kStandAlone && (failed = t.MakeBackupTrack())) AliDebug(2, Form("Failed backup on cut[%d]", failed));
9e85cb05 994
053767a4 995 } // end layers loop
eb2b4f91 996 //printf("clusters[%d] chi2[%f] x[%f] status[%d ", n, t.GetChi2(), t.GetX(), t.GetStatusTRD());
997 //for(int i=0; i<6; i++) printf("%d ", t.GetStatusTRD(i)); printf("]\n");
41702fec 998
7c3eecb8 999 if(debugLevel > 1){
41702fec 1000 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
eb2b4f91 1001 AliTRDtrackV1 track(t);
1002 track.SetOwner();
7c3eecb8 1003 (*cstreamer) << "FollowBackProlongation0"
eb2b4f91 1004 << "EventNumber=" << eventNumber
1005 << "ncl=" << n
1006 << "track.=" << &track
41702fec 1007 << "\n";
1008 }
1009
eb2b4f91 1010 return n;
0906e73e 1011}
1012
eb38ed55 1013//_________________________________________________________________________
4d6aee34 1014Float_t AliTRDtrackerV1::FitRieman(AliTRDseedV1 *tracklets, Double_t *chi2, Int_t *const planes){
41702fec 1015 //
1016 // Fits a Riemann-circle to the given points without tilting pad correction.
1017 // The fit is performed using an instance of the class AliRieman (equations
1018 // and transformations see documentation of this class)
1019 // Afterwards all the tracklets are Updated
1020 //
1021 // Parameters: - Array of tracklets (AliTRDseedV1)
1022 // - Storage for the chi2 values (beginning with direction z)
1023 // - Seeding configuration
1024 // Output: - The curvature
1025 //
1026 AliRieman *fitter = AliTRDtrackerV1::GetRiemanFitter();
1027 fitter->Reset();
1028 Int_t allplanes[] = {0, 1, 2, 3, 4, 5};
1029 Int_t *ppl = &allplanes[0];
1030 Int_t maxLayers = 6;
1031 if(planes){
1032 maxLayers = 4;
1033 ppl = planes;
1034 }
1035 for(Int_t il = 0; il < maxLayers; il++){
1036 if(!tracklets[ppl[il]].IsOK()) continue;
e3cf3d02 1037 fitter->AddPoint(tracklets[ppl[il]].GetX0(), tracklets[ppl[il]].GetYfit(0), tracklets[ppl[il]].GetZfit(0),1,10);
41702fec 1038 }
1039 fitter->Update();
1040 // Set the reference position of the fit and calculate the chi2 values
1041 memset(chi2, 0, sizeof(Double_t) * 2);
1042 for(Int_t il = 0; il < maxLayers; il++){
1043 // Reference positions
1044 tracklets[ppl[il]].Init(fitter);
1045
1046 // chi2
1047 if((!tracklets[ppl[il]].IsOK()) && (!planes)) continue;
1048 chi2[0] += tracklets[ppl[il]].GetChi2Y();
1049 chi2[1] += tracklets[ppl[il]].GetChi2Z();
1050 }
1051 return fitter->GetC();
eb38ed55 1052}
1053
1054//_________________________________________________________________________
1055void AliTRDtrackerV1::FitRieman(AliTRDcluster **seedcl, Double_t chi2[2])
1056{
41702fec 1057 //
1058 // Performs a Riemann helix fit using the seedclusters as spacepoints
1059 // Afterwards the chi2 values are calculated and the seeds are updated
1060 //
1061 // Parameters: - The four seedclusters
1062 // - The tracklet array (AliTRDseedV1)
1063 // - The seeding configuration
1064 // - Chi2 array
1065 //
1066 // debug level 2
1067 //
1068 AliRieman *fitter = AliTRDtrackerV1::GetRiemanFitter();
1069 fitter->Reset();
a3743898 1070 for(Int_t i = 0; i < 4; i++){
a3743898 1071 fitter->AddPoint(seedcl[i]->GetX(), seedcl[i]->GetY(), seedcl[i]->GetZ(), 1., 10.);
1072 }
41702fec 1073 fitter->Update();
1074
1075
1076 // Update the seed and calculated the chi2 value
1077 chi2[0] = 0; chi2[1] = 0;
1078 for(Int_t ipl = 0; ipl < kNSeedPlanes; ipl++){
1079 // chi2
1080 chi2[0] += (seedcl[ipl]->GetZ() - fitter->GetZat(seedcl[ipl]->GetX())) * (seedcl[ipl]->GetZ() - fitter->GetZat(seedcl[ipl]->GetX()));
1081 chi2[1] += (seedcl[ipl]->GetY() - fitter->GetYat(seedcl[ipl]->GetX())) * (seedcl[ipl]->GetY() - fitter->GetYat(seedcl[ipl]->GetX()));
1082 }
eb38ed55 1083}
1084
1085
1086//_________________________________________________________________________
1087Float_t AliTRDtrackerV1::FitTiltedRiemanConstraint(AliTRDseedV1 *tracklets, Double_t zVertex)
1088{
41702fec 1089 //
1090 // Fits a helix to the clusters. Pad tilting is considered. As constraint it is
1091 // assumed that the vertex position is set to 0.
1092 // This method is very usefull for high-pt particles
1093 // Basis for the fit: (x - x0)^2 + (y - y0)^2 - R^2 = 0
1094 // x0, y0: Center of the circle
1095 // Measured y-position: ymeas = y - tan(phiT)(zc - zt)
1096 // zc: center of the pad row
1097 // Equation which has to be fitted (after transformation):
1098 // a + b * u + e * v + 2*(ymeas + tan(phiT)(z - zVertex))*t = 0
1099 // Transformation:
1100 // t = 1/(x^2 + y^2)
1101 // u = 2 * x * t
1102 // v = 2 * x * tan(phiT) * t
1103 // Parameters in the equation:
1104 // a = -1/y0, b = x0/y0, e = dz/dx
1105 //
1106 // The Curvature is calculated by the following equation:
1107 // - curv = a/Sqrt(b^2 + 1) = 1/R
1108 // Parameters: - the 6 tracklets
1109 // - the Vertex constraint
1110 // Output: - the Chi2 value of the track
1111 //
1112 // debug level 5
1113 //
1114
1115 TLinearFitter *fitter = GetTiltedRiemanFitterConstraint();
1116 fitter->StoreData(kTRUE);
1117 fitter->ClearPoints();
4d6aee34 1118 AliTRDcluster *cl = NULL;
41702fec 1119
1120 Float_t x, y, z, w, t, error, tilt;
1121 Double_t uvt[2];
1122 Int_t nPoints = 0;
053767a4 1123 for(Int_t ilr = 0; ilr < AliTRDgeometry::kNlayer; ilr++){
1124 if(!tracklets[ilr].IsOK()) continue;
8d2bec9e 1125 for(Int_t itb = 0; itb < AliTRDseedV1::kNclusters; itb++){
053767a4 1126 if(!tracklets[ilr].IsUsable(itb)) continue;
1127 cl = tracklets[ilr].GetClusters(itb);
1742f24c 1128 if(!cl->IsInChamber()) continue;
41702fec 1129 x = cl->GetX();
1130 y = cl->GetY();
1131 z = cl->GetZ();
053767a4 1132 tilt = tracklets[ilr].GetTilt();
41702fec 1133 // Transformation
1134 t = 1./(x * x + y * y);
1135 uvt[0] = 2. * x * t;
1136 uvt[1] = 2. * x * t * tilt ;
1137 w = 2. * (y + tilt * (z - zVertex)) * t;
78b7d24c 1138 error = 2. * TMath::Sqrt(cl->GetSigmaY2()+tilt*tilt*cl->GetSigmaZ2()) * t;
41702fec 1139 fitter->AddPoint(uvt, w, error);
1140 nPoints++;
1141 }
1142 }
e17f4785 1143 fitter->Eval();
41702fec 1144
1145 // Calculate curvature
1146 Double_t a = fitter->GetParameter(0);
1147 Double_t b = fitter->GetParameter(1);
1148 Double_t curvature = a/TMath::Sqrt(b*b + 1);
1149
1150 Float_t chi2track = fitter->GetChisquare()/Double_t(nPoints);
1151 for(Int_t ip = 0; ip < AliTRDtrackerV1::kNPlanes; ip++)
68f9b6bd 1152 tracklets[ip].SetC(curvature, 1);
1153
1154 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 1155
a2fbb6ec 1156/* if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker()) >= 5){
41702fec 1157 //Linear Model on z-direction
1158 Double_t xref = CalculateReferenceX(tracklets); // Relative to the middle of the stack
1159 Double_t slope = fitter->GetParameter(2);
1160 Double_t zref = slope * xref;
1161 Float_t chi2Z = CalculateChi2Z(tracklets, zref, slope, xref);
1162 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
1163 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
4d6aee34 1164 TTreeSRedirector &treeStreamer = *fkReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
41702fec 1165 treeStreamer << "FitTiltedRiemanConstraint"
1166 << "EventNumber=" << eventNumber
1167 << "CandidateNumber=" << candidateNumber
1168 << "Curvature=" << curvature
1169 << "Chi2Track=" << chi2track
1170 << "Chi2Z=" << chi2Z
1171 << "zref=" << zref
1172 << "\n";
3a039a31 1173 }*/
41702fec 1174 return chi2track;
eb38ed55 1175}
1176
1177//_________________________________________________________________________
1178Float_t AliTRDtrackerV1::FitTiltedRieman(AliTRDseedV1 *tracklets, Bool_t sigError)
1179{
41702fec 1180 //
1181 // Performs a Riemann fit taking tilting pad correction into account
1182 // The equation of a Riemann circle, where the y position is substituted by the
1183 // measured y-position taking pad tilting into account, has to be transformed
1184 // into a 4-dimensional hyperplane equation
1185 // Riemann circle: (x-x0)^2 + (y-y0)^2 -R^2 = 0
1186 // Measured y-Position: ymeas = y - tan(phiT)(zc - zt)
1187 // zc: center of the pad row
1188 // zt: z-position of the track
1189 // The z-position of the track is assumed to be linear dependent on the x-position
1190 // Transformed equation: a + b * u + c * t + d * v + e * w - 2 * (ymeas + tan(phiT) * zc) * t = 0
1191 // Transformation: u = 2 * x * t
1192 // v = 2 * tan(phiT) * t
1193 // w = 2 * tan(phiT) * (x - xref) * t
1194 // t = 1 / (x^2 + ymeas^2)
1195 // Parameters: a = -1/y0
1196 // b = x0/y0
1197 // c = (R^2 -x0^2 - y0^2)/y0
1198 // d = offset
1199 // e = dz/dx
1200 // If the offset respectively the slope in z-position is impossible, the parameters are fixed using
1201 // results from the simple riemann fit. Afterwards the fit is redone.
1202 // The curvature is calculated according to the formula:
1203 // curv = a/(1 + b^2 + c*a) = 1/R
1204 //
1205 // Paramters: - Array of tracklets (connected to the track candidate)
1206 // - Flag selecting the error definition
1207 // Output: - Chi2 values of the track (in Parameter list)
1208 //
1209 TLinearFitter *fitter = GetTiltedRiemanFitter();
1210 fitter->StoreData(kTRUE);
1211 fitter->ClearPoints();
1212 AliTRDLeastSquare zfitter;
4d6aee34 1213 AliTRDcluster *cl = NULL;
41702fec 1214
1215 Double_t xref = CalculateReferenceX(tracklets);
6e39bde4 1216 Double_t x, y, z, t, tilt, dx, w, we, erry, errz;
1217 Double_t uvt[4], sumPolY[5], sumPolZ[3];
1218 memset(sumPolY, 0, sizeof(Double_t) * 5);
1219 memset(sumPolZ, 0, sizeof(Double_t) * 3);
41702fec 1220 Int_t nPoints = 0;
1221 // Containers for Least-square fitter
1222 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1223 if(!tracklets[ipl].IsOK()) continue;
ed15ef4f 1224 tilt = tracklets[ipl].GetTilt();
8d2bec9e 1225 for(Int_t itb = 0; itb < AliTRDseedV1::kNclusters; itb++){
41702fec 1226 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1742f24c 1227 if(!cl->IsInChamber()) continue;
68f9b6bd 1228 //if (!tracklets[ipl].IsUsable(itb)) continue;
41702fec 1229 x = cl->GetX();
1230 y = cl->GetY();
1231 z = cl->GetZ();
41702fec 1232 dx = x - xref;
1233 // Transformation
1234 t = 1./(x*x + y*y);
1235 uvt[0] = 2. * x * t;
1236 uvt[1] = t;
1237 uvt[2] = 2. * tilt * t;
1238 uvt[3] = 2. * tilt * dx * t;
1239 w = 2. * (y + tilt*z) * t;
1240 // error definition changes for the different calls
1241 we = 2. * t;
78b7d24c 1242 we *= sigError ? TMath::Sqrt(cl->GetSigmaY2()+tilt*tilt*cl->GetSigmaZ2()) : 0.2;
41702fec 1243 fitter->AddPoint(uvt, w, we);
1244 zfitter.AddPoint(&x, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
6e39bde4 1245 // adding points for covariance matrix estimation
1246 erry = 1./(TMath::Sqrt(cl->GetSigmaY2()) + 0.1); // 0.1 is a systematic error (due to misalignment and miscalibration)
1247 erry *= erry;
1248 errz = 1./cl->GetSigmaZ2();
1249 for(Int_t ipol = 0; ipol < 5; ipol++){
1250 sumPolY[ipol] += erry;
1251 erry *= x;
1252 if(ipol < 3){
1253 sumPolZ[ipol] += errz;
1254 errz *= x;
1255 }
1256 }
41702fec 1257 nPoints++;
1258 }
1259 }
e17f4785 1260 fitter->Eval();
41702fec 1261 zfitter.Eval();
1262
1263 Double_t offset = fitter->GetParameter(3);
1264 Double_t slope = fitter->GetParameter(4);
1265
1266 // Linear fitter - not possible to make boundaries
1267 // Do not accept non possible z and dzdx combinations
1268 Bool_t acceptablez = kTRUE;
1269 Double_t zref = 0.0;
1270 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
1271 if(!tracklets[iLayer].IsOK()) continue;
1272 zref = offset + slope * (tracklets[iLayer].GetX0() - xref);
e3cf3d02 1273 if (TMath::Abs(tracklets[iLayer].GetZfit(0) - zref) > tracklets[iLayer].GetPadLength() * 0.5 + 1.0)
41702fec 1274 acceptablez = kFALSE;
1275 }
1276 if (!acceptablez) {
1277 Double_t dzmf = zfitter.GetFunctionParameter(1);
1278 Double_t zmf = zfitter.GetFunctionValue(&xref);
1279 fgTiltedRieman->FixParameter(3, zmf);
1280 fgTiltedRieman->FixParameter(4, dzmf);
e17f4785 1281 fitter->Eval();
41702fec 1282 fitter->ReleaseParameter(3);
1283 fitter->ReleaseParameter(4);
1284 offset = fitter->GetParameter(3);
1285 slope = fitter->GetParameter(4);
1286 }
1287
1288 // Calculate Curvarture
1289 Double_t a = fitter->GetParameter(0);
1290 Double_t b = fitter->GetParameter(1);
1291 Double_t c = fitter->GetParameter(2);
1292 Double_t curvature = 1.0 + b*b - c*a;
68f9b6bd 1293 if (curvature > 0.0) curvature = a / TMath::Sqrt(curvature);
41702fec 1294
1295 Double_t chi2track = fitter->GetChisquare()/Double_t(nPoints);
1296
6e39bde4 1297 // Prepare error calculation
1298 TMatrixD covarPolY(3,3);
1299 covarPolY(0,0) = sumPolY[0]; covarPolY(1,1) = sumPolY[2]; covarPolY(2,2) = sumPolY[4];
1300 covarPolY(0,1) = covarPolY(1,0) = sumPolY[1];
1301 covarPolY(0,2) = covarPolY(2,0) = sumPolY[2];
1302 covarPolY(2,1) = covarPolY(1,2) = sumPolY[3];
1303 covarPolY.Invert();
1304 TMatrixD covarPolZ(2,2);
1305 covarPolZ(0,0) = sumPolZ[0]; covarPolZ(1,1) = sumPolZ[2];
1306 covarPolZ(1,0) = covarPolZ(0,1) = sumPolZ[1];
1307 covarPolZ.Invert();
1308
41702fec 1309 // Update the tracklets
6e39bde4 1310 Double_t x1, dy, dz;
1311 Double_t cov[15];
1312 memset(cov, 0, sizeof(Double_t) * 15);
41702fec 1313 for(Int_t iLayer = 0; iLayer < AliTRDtrackerV1::kNPlanes; iLayer++) {
1314
1315 x = tracklets[iLayer].GetX0();
6e39bde4 1316 x1 = x - xref;
41702fec 1317 y = 0;
1318 z = 0;
1319 dy = 0;
1320 dz = 0;
6e39bde4 1321 memset(cov, 0, sizeof(Double_t) * 3);
1322 TMatrixD transform(3,3);
1323 transform(0,0) = 1;
1324 transform(0,1) = x;
1325 transform(0,2) = x*x;
1326 transform(1,1) = 1;
1327 transform(1,2) = x;
1328 transform(2,2) = 1;
1329 TMatrixD covariance(transform, TMatrixD::kMult, covarPolY);
1330 covariance *= transform.T();
1331 TMatrixD transformZ(2,2);
1332 transformZ(0,0) = transformZ(1,1) = 1;
1333 transformZ(0,1) = x;
1334 TMatrixD covarZ(transformZ, TMatrixD::kMult, covarPolZ);
1335 covarZ *= transformZ.T();
41702fec 1336 // y: R^2 = (x - x0)^2 + (y - y0)^2
1337 // => y = y0 +/- Sqrt(R^2 - (x - x0)^2)
1338 // R = Sqrt() = 1/Curvature
1339 // => y = y0 +/- Sqrt(1/Curvature^2 - (x - x0)^2)
1340 Double_t res = (x * a + b); // = (x - x0)/y0
1341 res *= res;
1342 res = 1.0 - c * a + b * b - res; // = (R^2 - (x - x0)^2)/y0^2
1343 if (res >= 0) {
1344 res = TMath::Sqrt(res);
1345 y = (1.0 - res) / a;
1346 }
6e39bde4 1347 cov[0] = covariance(0,0);
1348 cov[2] = covarZ(0,0);
1349 cov[1] = 0.;
41702fec 1350
1351 // dy: R^2 = (x - x0)^2 + (y - y0)^2
1352 // => y = +/- Sqrt(R^2 - (x - x0)^2) + y0
1353 // => dy/dx = (x - x0)/Sqrt(R^2 - (x - x0)^2)
1354 // Curvature: cr = 1/R = a/Sqrt(1 + b^2 - c*a)
1355 // => dy/dx = (x - x0)/(1/(cr^2) - (x - x0)^2)
1356 Double_t x0 = -b / a;
1357 if (-c * a + b * b + 1 > 0) {
1358 if (1.0/(curvature * curvature) - (x - x0) * (x - x0) > 0.0) {
6e39bde4 1359 Double_t yderiv = (x - x0) / TMath::Sqrt(1.0/(curvature * curvature) - (x - x0) * (x - x0));
1360 if (a < 0) yderiv *= -1.0;
1361 dy = yderiv;
41702fec 1362 }
1363 }
1364 z = offset + slope * (x - xref);
1365 dz = slope;
1366 tracklets[iLayer].SetYref(0, y);
1367 tracklets[iLayer].SetYref(1, dy);
1368 tracklets[iLayer].SetZref(0, z);
1369 tracklets[iLayer].SetZref(1, dz);
1370 tracklets[iLayer].SetC(curvature);
6e39bde4 1371 tracklets[iLayer].SetCovRef(cov);
41702fec 1372 tracklets[iLayer].SetChi2(chi2track);
1373 }
68f9b6bd 1374 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 1375
a2fbb6ec 1376/* if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) >=5){
1377 TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
41702fec 1378 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
1379 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
1380 Double_t chi2z = CalculateChi2Z(tracklets, offset, slope, xref);
1381 cstreamer << "FitTiltedRieman0"
1382 << "EventNumber=" << eventNumber
1383 << "CandidateNumber=" << candidateNumber
1384 << "xref=" << xref
1385 << "Chi2Z=" << chi2z
1386 << "\n";
3a039a31 1387 }*/
41702fec 1388 return chi2track;
eb38ed55 1389}
1390
3b57a3f7 1391
9e333711 1392//____________________________________________________________________
6e4d4425 1393Double_t AliTRDtrackerV1::FitLine(const AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t err, Int_t np, AliTrackPoint *points)
9e333711 1394{
4d6aee34 1395 //
1396 // Fit track with a staight line
1397 // Fills an AliTrackPoint array with np points
1398 // Function should be used to refit tracks when no magnetic field was on
1399 //
9e333711 1400 AliTRDLeastSquare yfitter, zfitter;
4d6aee34 1401 AliTRDcluster *cl = NULL;
9e333711 1402
4d6aee34 1403 AliTRDseedV1 work[kNPlanes], *tracklet = NULL;
9e333711 1404 if(!tracklets){
1405 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1406 if(!(tracklet = track->GetTracklet(ipl))) continue;
1407 if(!tracklet->IsOK()) continue;
1408 new(&work[ipl]) AliTRDseedV1(*tracklet);
1409 }
1410 tracklets = &work[0];
1411 }
1412
1413 Double_t xref = CalculateReferenceX(tracklets);
1414 Double_t x, y, z, dx, ye, yr, tilt;
1415 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1416 if(!tracklets[ipl].IsOK()) continue;
1417 for(Int_t itb = 0; itb < fgNTimeBins; itb++){
1418 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1419 if (!tracklets[ipl].IsUsable(itb)) continue;
1420 x = cl->GetX();
1421 z = cl->GetZ();
1422 dx = x - xref;
1423 zfitter.AddPoint(&dx, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
1424 }
1425 }
1426 zfitter.Eval();
1427 Double_t z0 = zfitter.GetFunctionParameter(0);
1428 Double_t dzdx = zfitter.GetFunctionParameter(1);
1429 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1430 if(!tracklets[ipl].IsOK()) continue;
1431 for(Int_t itb = 0; itb < fgNTimeBins; itb++){
1432 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1433 if (!tracklets[ipl].IsUsable(itb)) continue;
1434 x = cl->GetX();
1435 y = cl->GetY();
1436 z = cl->GetZ();
1437 tilt = tracklets[ipl].GetTilt();
1438 dx = x - xref;
1439 yr = y + tilt*(z - z0 - dzdx*dx);
1440 // error definition changes for the different calls
1441 ye = tilt*TMath::Sqrt(cl->GetSigmaZ2());
1442 ye += err ? tracklets[ipl].GetSigmaY() : 0.2;
1443 yfitter.AddPoint(&dx, yr, ye);
1444 }
1445 }
1446 yfitter.Eval();
1447 Double_t y0 = yfitter.GetFunctionParameter(0);
1448 Double_t dydx = yfitter.GetFunctionParameter(1);
1449 Double_t chi2 = 0.;//yfitter.GetChisquare()/Double_t(nPoints);
1450
1451 //update track points array
1452 if(np && points){
1453 Float_t xyz[3];
1454 for(int ip=0; ip<np; ip++){
1455 points[ip].GetXYZ(xyz);
1456 xyz[1] = y0 + dydx * (xyz[0] - xref);
1457 xyz[2] = z0 + dzdx * (xyz[0] - xref);
1458 points[ip].SetXYZ(xyz);
1459 }
1460 }
1461 return chi2;
1462}
1463
1464
3b57a3f7 1465//_________________________________________________________________________
6e4d4425 1466Double_t AliTRDtrackerV1::FitRiemanTilt(const AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t sigError, Int_t np, AliTrackPoint *points)
3b57a3f7 1467{
0fa1a8ee 1468//
1469// Performs a Riemann fit taking tilting pad correction into account
1470//
1471// Paramters: - Array of tracklets (connected to the track candidate)
1472// - Flag selecting the error definition
1473// Output: - Chi2 values of the track (in Parameter list)
1474//
1475// The equations which has to be solved simultaneously are:
1476// BEGIN_LATEX
1477// R^{2} = (x-x_{0})^{2} + (y^{*}-y_{0})^{2}
1478// y^{*} = y - tg(h)(z - z_{t})
1479// z_{t} = z_{0}+dzdx*(x-x_{r})
1480// END_LATEX
1481// with (x, y, z) the coordinate of the cluster, (x_0, y_0, z_0) the coordinate of the center of the Riemann circle,
1482// R its radius, x_r a constant refrence radial position in the middle of the TRD stack and dzdx the slope of the
1483// track in the x-z plane. Using the following transformations
1484// BEGIN_LATEX
1485// t = 1 / (x^{2} + y^{2})
1486// u = 2 * x * t
1487// v = 2 * tan(h) * t
1488// w = 2 * tan(h) * (x - x_{r}) * t
1489// END_LATEX
1490// One gets the following linear equation
1491// BEGIN_LATEX
1492// a + b * u + c * t + d * v + e * w = 2 * (y + tg(h) * z) * t
1493// END_LATEX
1494// where the coefficients have the following meaning
1495// BEGIN_LATEX
1496// a = -1/y_{0}
1497// b = x_{0}/y_{0}
1498// c = (R^{2} -x_{0}^{2} - y_{0}^{2})/y_{0}
1499// d = z_{0}
1500// e = dz/dx
1501// END_LATEX
1502// The error calculation for the free term is thus
1503// BEGIN_LATEX
1504// #sigma = 2 * #sqrt{#sigma^{2}_{y} + (tilt corr ...) + tg^{2}(h) * #sigma^{2}_{z}} * t
1505// END_LATEX
1506//
1507// From this simple model one can compute chi^2 estimates and a rough approximation of pt from the curvature according
1508// to the formula:
1509// BEGIN_LATEX
1510// C = 1/R = a/(1 + b^{2} + c*a)
1511// END_LATEX
1512//
1513// Authors
1514// M.Ivanov <M.Ivanov@gsi.de>
1515// A.Bercuci <A.Bercuci@gsi.de>
1516// M.Fasel <M.Fasel@gsi.de>
1517
41702fec 1518 TLinearFitter *fitter = GetTiltedRiemanFitter();
1519 fitter->StoreData(kTRUE);
1520 fitter->ClearPoints();
1521 AliTRDLeastSquare zfitter;
4d6aee34 1522 AliTRDcluster *cl = NULL;
3b57a3f7 1523
4d6aee34 1524 AliTRDseedV1 work[kNPlanes], *tracklet = NULL;
3b57a3f7 1525 if(!tracklets){
1526 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1527 if(!(tracklet = track->GetTracklet(ipl))) continue;
1528 if(!tracklet->IsOK()) continue;
1529 new(&work[ipl]) AliTRDseedV1(*tracklet);
1530 }
1531 tracklets = &work[0];
1532 }
1533
41702fec 1534 Double_t xref = CalculateReferenceX(tracklets);
68f9b6bd 1535 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 1536 Double_t x, y, z, t, tilt, dx, w, we;
1537 Double_t uvt[4];
1538 Int_t nPoints = 0;
1539 // Containers for Least-square fitter
1540 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1541 if(!tracklets[ipl].IsOK()) continue;
8d2bec9e 1542 for(Int_t itb = 0; itb < AliTRDseedV1::kNclusters; itb++){
41702fec 1543 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
352cef8f 1544 //if (!tracklets[ipl].IsUsable(itb)) continue;
41702fec 1545 x = cl->GetX();
1546 y = cl->GetY();
1547 z = cl->GetZ();
1548 tilt = tracklets[ipl].GetTilt();
1549 dx = x - xref;
1550 // Transformation
1551 t = 1./(x*x + y*y);
1552 uvt[0] = 2. * x * t;
1553 uvt[1] = t;
1554 uvt[2] = 2. * tilt * t;
1555 uvt[3] = 2. * tilt * dx * t;
1556 w = 2. * (y + tilt*z) * t;
1557 // error definition changes for the different calls
1558 we = 2. * t;
f29f13a6 1559 we *= sigError ? TMath::Sqrt(cl->GetSigmaY2()) : 0.2;
41702fec 1560 fitter->AddPoint(uvt, w, we);
1561 zfitter.AddPoint(&x, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
1562 nPoints++;
1563 }
1564 }
aec26713 1565 if(fitter->Eval()) return 1.E10;
1566
41702fec 1567 Double_t z0 = fitter->GetParameter(3);
1568 Double_t dzdx = fitter->GetParameter(4);
3b57a3f7 1569
1570
1571 // Linear fitter - not possible to make boundaries
1572 // Do not accept non possible z and dzdx combinations
1573 Bool_t accept = kTRUE;
1574 Double_t zref = 0.0;
1575 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
1576 if(!tracklets[iLayer].IsOK()) continue;
1577 zref = z0 + dzdx * (tracklets[iLayer].GetX0() - xref);
e3cf3d02 1578 if (TMath::Abs(tracklets[iLayer].GetZfit(0) - zref) > tracklets[iLayer].GetPadLength() * 0.5 + 1.0)
3b57a3f7 1579 accept = kFALSE;
1580 }
1581 if (!accept) {
41702fec 1582 zfitter.Eval();
3b57a3f7 1583 Double_t dzmf = zfitter.GetFunctionParameter(1);
1584 Double_t zmf = zfitter.GetFunctionValue(&xref);
1585 fitter->FixParameter(3, zmf);
1586 fitter->FixParameter(4, dzmf);
e17f4785 1587 fitter->Eval();
3b57a3f7 1588 fitter->ReleaseParameter(3);
1589 fitter->ReleaseParameter(4);
1590 z0 = fitter->GetParameter(3); // = zmf ?
1591 dzdx = fitter->GetParameter(4); // = dzmf ?
1592 }
1593
1594 // Calculate Curvature
1595 Double_t a = fitter->GetParameter(0);
1596 Double_t b = fitter->GetParameter(1);
1597 Double_t c = fitter->GetParameter(2);
1598 Double_t y0 = 1. / a;
1599 Double_t x0 = -b * y0;
a015e406 1600 Double_t tmp = y0*y0 + x0*x0 - c*y0;
1601 if(tmp<=0.) return 1.E10;
4d6aee34 1602 Double_t radius = TMath::Sqrt(tmp);
1603 Double_t curvature = 1.0 + b*b - c*a;
1604 if (curvature > 0.0) curvature = a / TMath::Sqrt(curvature);
3b57a3f7 1605
1606 // Calculate chi2 of the fit
1607 Double_t chi2 = fitter->GetChisquare()/Double_t(nPoints);
68f9b6bd 1608 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 1609
1610 // Update the tracklets
1611 if(!track){
1612 for(Int_t ip = 0; ip < kNPlanes; ip++) {
1613 x = tracklets[ip].GetX0();
4d6aee34 1614 tmp = radius*radius-(x-x0)*(x-x0);
a015e406 1615 if(tmp <= 0.) continue;
1616 tmp = TMath::Sqrt(tmp);
3b57a3f7 1617
1618 // y: R^2 = (x - x0)^2 + (y - y0)^2
1619 // => y = y0 +/- Sqrt(R^2 - (x - x0)^2)
1620 tracklets[ip].SetYref(0, y0 - (y0>0.?1.:-1)*tmp);
1621 // => dy/dx = (x - x0)/Sqrt(R^2 - (x - x0)^2)
1622 tracklets[ip].SetYref(1, (x - x0) / tmp);
1623 tracklets[ip].SetZref(0, z0 + dzdx * (x - xref));
1624 tracklets[ip].SetZref(1, dzdx);
4d6aee34 1625 tracklets[ip].SetC(curvature);
3b57a3f7 1626 tracklets[ip].SetChi2(chi2);
1627 }
1628 }
3b57a3f7 1629 //update track points array
1630 if(np && points){
1631 Float_t xyz[3];
1632 for(int ip=0; ip<np; ip++){
1633 points[ip].GetXYZ(xyz);
4d6aee34 1634 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 1635 xyz[2] = z0 + dzdx * (xyz[0] - xref);
1636 points[ip].SetXYZ(xyz);
1637 }
1638 }
1639
3b57a3f7 1640 return chi2;
1641}
1642
1643
1bf51039 1644//____________________________________________________________________
e17f4785 1645Double_t AliTRDtrackerV1::FitKalman(AliTRDtrackV1 *track, AliTRDseedV1 * const tracklets, Bool_t up, Int_t np, AliTrackPoint *points)
1bf51039 1646{
1647// Kalman filter implementation for the TRD.
1648// It returns the positions of the fit in the array "points"
1649//
1650// Author : A.Bercuci@gsi.de
1651
3cfaffa4 1652 // printf("Start track @ x[%f]\n", track->GetX());
1bf51039 1653
1654 //prepare marker points along the track
1655 Int_t ip = np ? 0 : 1;
1656 while(ip<np){
1657 if((up?-1:1) * (track->GetX() - points[ip].GetX()) > 0.) break;
1658 //printf("AliTRDtrackerV1::FitKalman() : Skip track marker x[%d] = %7.3f. Before track start ( %7.3f ).\n", ip, points[ip].GetX(), track->GetX());
1659 ip++;
1660 }
1661 //if(points) printf("First marker point @ x[%d] = %f\n", ip, points[ip].GetX());
1662
1663
4d6aee34 1664 AliTRDseedV1 tracklet, *ptrTracklet = NULL;
1bf51039 1665
1666 //Loop through the TRD planes
1667 for (Int_t jplane = 0; jplane < kNPlanes; jplane++) {
1668 // GET TRACKLET OR BUILT IT
1669 Int_t iplane = up ? jplane : kNPlanes - 1 - jplane;
1670 if(tracklets){
e17f4785 1671 if(!(ptrTracklet = &tracklets[iplane])) continue;
1bf51039 1672 }else{
1673 if(!(ptrTracklet = track->GetTracklet(iplane))){
4d6aee34 1674 /*AliTRDtrackerV1 *tracker = NULL;
a2fbb6ec 1675 if(!(tracker = dynamic_cast<AliTRDtrackerV1*>( AliTRDrecoParam:Tracker()))) continue;
1bf51039 1676 ptrTracklet = new(&tracklet) AliTRDseedV1(iplane);
1677 if(!tracker->MakeTracklet(ptrTracklet, track)) */
1678 continue;
1679 }
1680 }
1681 if(!ptrTracklet->IsOK()) continue;
1682
1683 Double_t x = ptrTracklet->GetX0();
1684
1685 while(ip < np){
1686 //don't do anything if next marker is after next update point.
1687 if((up?-1:1) * (points[ip].GetX() - x) - fgkMaxStep < 0) break;
1bf51039 1688 if(((up?-1:1) * (points[ip].GetX() - track->GetX()) < 0) && !PropagateToX(*track, points[ip].GetX(), fgkMaxStep)) return -1.;
1689
1690 Double_t xyz[3]; // should also get the covariance
3cfaffa4 1691 track->GetXYZ(xyz);
1692 track->Global2LocalPosition(xyz, track->GetAlpha());
1693 points[ip].SetXYZ(xyz[0], xyz[1], xyz[2]);
1bf51039 1694 ip++;
1695 }
3cfaffa4 1696 // printf("plane[%d] tracklet[%p] x[%f]\n", iplane, ptrTracklet, x);
1bf51039 1697
3cfaffa4 1698 // Propagate closer to the next update point
1bf51039 1699 if(((up?-1:1) * (x - track->GetX()) + fgkMaxStep < 0) && !PropagateToX(*track, x + (up?-1:1)*fgkMaxStep, fgkMaxStep)) return -1.;
1700
1701 if(!AdjustSector(track)) return -1;
1702 if(TMath::Abs(track->GetSnp()) > fgkMaxSnp) return -1;
1703
1704 //load tracklet to the tracker and the track
1705/* Int_t index;
1706 if((index = FindTracklet(ptrTracklet)) < 0){
1707 ptrTracklet = SetTracklet(&tracklet);
1708 index = fTracklets->GetEntriesFast()-1;
1709 }
1710 track->SetTracklet(ptrTracklet, index);*/
1711
1712
1713 // register tracklet to track with tracklet creation !!
1714 // PropagateBack : loaded tracklet to the tracker and update index
1715 // RefitInward : update index
1716 // MakeTrack : loaded tracklet to the tracker and update index
1717 if(!tracklets) track->SetTracklet(ptrTracklet, -1);
1718
1719
1720 //Calculate the mean material budget along the path inside the chamber
1721 Double_t xyz0[3]; track->GetXYZ(xyz0);
1722 Double_t alpha = track->GetAlpha();
1723 Double_t xyz1[3], y, z;
1724 if(!track->GetProlongation(x, y, z)) return -1;
1725 xyz1[0] = x * TMath::Cos(alpha) - y * TMath::Sin(alpha);
1726 xyz1[1] = +x * TMath::Sin(alpha) + y * TMath::Cos(alpha);
1727 xyz1[2] = z;
fbe11be7 1728 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 1729 Double_t param[7];
3cfaffa4 1730 if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param) <=0.) break;
1bf51039 1731 Double_t xrho = param[0]*param[4]; // density*length
1732 Double_t xx0 = param[1]; // radiation length
1733
1734 //Propagate the track
1735 track->PropagateTo(x, xx0, xrho);
1736 if (!AdjustSector(track)) break;
1737
1738 //Update track
b72f4eaf 1739 Double_t cov[3]; ptrTracklet->GetCovAt(x, cov);
1740 Double_t p[2] = { ptrTracklet->GetY(), ptrTracklet->GetZ()};
1741 Double_t chi2 = ((AliExternalTrackParam*)track)->GetPredictedChi2(p, cov);
1742 if(chi2<1e+10) track->Update(p, cov, chi2);
1bf51039 1743 if(!up) continue;
1744
1745 //Reset material budget if 2 consecutive gold
1746 if(iplane>0 && track->GetTracklet(iplane-1) && ptrTracklet->GetN() + track->GetTracklet(iplane-1)->GetN() > 20) track->SetBudget(2, 0.);
1747 } // end planes loop
1748
1749 // extrapolation
1750 while(ip < np){
1751 if(((up?-1:1) * (points[ip].GetX() - track->GetX()) < 0) && !PropagateToX(*track, points[ip].GetX(), fgkMaxStep)) return -1.;
1752
1753 Double_t xyz[3]; // should also get the covariance
3cfaffa4 1754 track->GetXYZ(xyz);
1755 track->Global2LocalPosition(xyz, track->GetAlpha());
1756 points[ip].SetXYZ(xyz[0], xyz[1], xyz[2]);
1bf51039 1757 ip++;
1758 }
1759
1760 return track->GetChi2();
1761}
3b57a3f7 1762
eb38ed55 1763//_________________________________________________________________________
bb56afff 1764Float_t AliTRDtrackerV1::CalculateChi2Z(AliTRDseedV1 *tracklets, Double_t offset, Double_t slope, Double_t xref)
eb38ed55 1765{
41702fec 1766 //
1767 // Calculates the chi2-value of the track in z-Direction including tilting pad correction.
1768 // A linear dependence on the x-value serves as a model.
1769 // The parameters are related to the tilted Riemann fit.
1770 // Parameters: - Array of tracklets (AliTRDseedV1) related to the track candidate
1771 // - the offset for the reference x
1772 // - the slope
1773 // - the reference x position
1774 // Output: - The Chi2 value of the track in z-Direction
1775 //
1776 Float_t chi2Z = 0, nLayers = 0;
053767a4 1777 for (Int_t iLayer = 0; iLayer < AliTRDgeometry::kNlayer; iLayer++) {
41702fec 1778 if(!tracklets[iLayer].IsOK()) continue;
1779 Double_t z = offset + slope * (tracklets[iLayer].GetX0() - xref);
e3cf3d02 1780 chi2Z += TMath::Abs(tracklets[iLayer].GetZfit(0) - z);
41702fec 1781 nLayers++;
1782 }
1783 chi2Z /= TMath::Max((nLayers - 3.0),1.0);
1784 return chi2Z;
eb38ed55 1785}
1786
bccda319 1787//_____________________________________________________________________________
1788Int_t AliTRDtrackerV1::PropagateToX(AliTRDtrackV1 &t, Double_t xToGo, Double_t maxStep)
1789{
41702fec 1790 //
1791 // Starting from current X-position of track <t> this function
1792 // extrapolates the track up to radial position <xToGo>.
1793 // Returns 1 if track reaches the plane, and 0 otherwise
1794 //
bccda319 1795
41702fec 1796 const Double_t kEpsilon = 0.00001;
bccda319 1797
41702fec 1798 // Current track X-position
1799 Double_t xpos = t.GetX();
bccda319 1800
41702fec 1801 // Direction: inward or outward
1802 Double_t dir = (xpos < xToGo) ? 1.0 : -1.0;
bccda319 1803
41702fec 1804 while (((xToGo - xpos) * dir) > kEpsilon) {
bccda319 1805
41702fec 1806 Double_t xyz0[3];
1807 Double_t xyz1[3];
1808 Double_t param[7];
1809 Double_t x;
1810 Double_t y;
1811 Double_t z;
bccda319 1812
41702fec 1813 // The next step size
1814 Double_t step = dir * TMath::Min(TMath::Abs(xToGo-xpos),maxStep);
bccda319 1815
41702fec 1816 // Get the global position of the starting point
1817 t.GetXYZ(xyz0);
bccda319 1818
41702fec 1819 // X-position after next step
1820 x = xpos + step;
bccda319 1821
41702fec 1822 // Get local Y and Z at the X-position of the next step
3352b455 1823 if(t.GetProlongation(x,y,z)<0) return 0; // No prolongation possible
bccda319 1824
41702fec 1825 // The global position of the end point of this prolongation step
1826 xyz1[0] = x * TMath::Cos(t.GetAlpha()) - y * TMath::Sin(t.GetAlpha());
1827 xyz1[1] = +x * TMath::Sin(t.GetAlpha()) + y * TMath::Cos(t.GetAlpha());
1828 xyz1[2] = z;
bccda319 1829
41702fec 1830 // Calculate the mean material budget between start and
1831 // end point of this prolongation step
83dea92e 1832 if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param)<=0.) return 0;
bccda319 1833
41702fec 1834 // Propagate the track to the X-position after the next step
9c87a076 1835 if (!t.PropagateTo(x, param[1], param[0]*param[4])) return 0;
bccda319 1836
41702fec 1837 // Rotate the track if necessary
1838 AdjustSector(&t);
bccda319 1839
41702fec 1840 // New track X-position
1841 xpos = t.GetX();
bccda319 1842
41702fec 1843 }
bccda319 1844
41702fec 1845 return 1;
bccda319 1846
1847}
1848
eb38ed55 1849
1850//_____________________________________________________________________________
1851Int_t AliTRDtrackerV1::ReadClusters(TClonesArray* &array, TTree *clusterTree) const
1852{
41702fec 1853 //
1854 // Reads AliTRDclusters from the file.
1855 // The names of the cluster tree and branches
1856 // should match the ones used in AliTRDclusterizer::WriteClusters()
1857 //
1858
1859 Int_t nsize = Int_t(clusterTree->GetTotBytes() / (sizeof(AliTRDcluster)));
1860 TObjArray *clusterArray = new TObjArray(nsize+1000);
1861
1862 TBranch *branch = clusterTree->GetBranch("TRDcluster");
1863 if (!branch) {
1864 AliError("Can't get the branch !");
1865 return 1;
1866 }
1867 branch->SetAddress(&clusterArray);
1868
1869 if(!fClusters){
9e85cb05 1870 Float_t nclusters = fkRecoParam->GetNClusters();
4d6aee34 1871 if(fkReconstructor->IsHLT()) nclusters /= AliTRDgeometry::kNsector;
8ae98148 1872 array = new TClonesArray("AliTRDcluster", Int_t(nclusters));
41702fec 1873 array->SetOwner(kTRUE);
1874 }
1875
1876 // Loop through all entries in the tree
1877 Int_t nEntries = (Int_t) clusterTree->GetEntries();
1878 Int_t nbytes = 0;
1879 Int_t ncl = 0;
4d6aee34 1880 AliTRDcluster *c = NULL;
41702fec 1881 for (Int_t iEntry = 0; iEntry < nEntries; iEntry++) {
1882 // Import the tree
1883 nbytes += clusterTree->GetEvent(iEntry);
1884
1885 // Get the number of points in the detector
1886 Int_t nCluster = clusterArray->GetEntriesFast();
1887 for (Int_t iCluster = 0; iCluster < nCluster; iCluster++) {
1888 if(!(c = (AliTRDcluster *) clusterArray->UncheckedAt(iCluster))) continue;
41702fec 1889 new((*fClusters)[ncl++]) AliTRDcluster(*c);
1890 delete (clusterArray->RemoveAt(iCluster));
1891 }
1892
1893 }
1894 delete clusterArray;
1895
1896 return 0;
eb38ed55 1897}
1898
1899//_____________________________________________________________________________
1900Int_t AliTRDtrackerV1::LoadClusters(TTree *cTree)
1901{
41702fec 1902 //
66f6bfd9 1903 // Fills clusters into TRD tracking sectors
41702fec 1904 //
41702fec 1905
9e85cb05 1906 fkRecoParam = fkReconstructor->GetRecoParam(); // load reco param for this event
1907
4d6aee34 1908 if(!fkReconstructor->IsWritingClusters()){
48f8adf3 1909 fClusters = AliTRDReconstructor::GetClusters();
1910 } else {
66f6bfd9 1911 if (ReadClusters(fClusters, cTree)) {
1912 AliError("Problem with reading the clusters !");
1913 return 1;
1914 }
1915 }
1916 SetClustersOwner();
1917
48f8adf3 1918 if(!fClusters || !fClusters->GetEntriesFast()){
66f6bfd9 1919 AliInfo("No TRD clusters");
41702fec 1920 return 1;
1921 }
66f6bfd9 1922
1923 //Int_t nin =
1924 BuildTrackingContainers();
1925
1926 //Int_t ncl = fClusters->GetEntriesFast();
1927 //AliInfo(Form("Clusters %d [%6.2f %% in the active volume]", ncl, 100.*float(nin)/ncl));
1928
1929 return 0;
1930}
1931
1932//_____________________________________________________________________________
4d6aee34 1933Int_t AliTRDtrackerV1::LoadClusters(TClonesArray * const clusters)
66f6bfd9 1934{
1935 //
1936 // Fills clusters into TRD tracking sectors
1937 // Function for use in the HLT
1938
1939 if(!clusters || !clusters->GetEntriesFast()){
1940 AliInfo("No TRD clusters");
41702fec 1941 return 1;
1942 }
1943
66f6bfd9 1944 fClusters = clusters;
1945 SetClustersOwner();
1946
9e85cb05 1947 fkRecoParam = fkReconstructor->GetRecoParam(); // load reco param for this event
66f6bfd9 1948 BuildTrackingContainers();
1949
1950 //Int_t ncl = fClusters->GetEntriesFast();
1951 //AliInfo(Form("Clusters %d [%6.2f %% in the active volume]", ncl, 100.*float(nin)/ncl));
1952
1953 return 0;
1954}
1955
1956
1957//____________________________________________________________________
1958Int_t AliTRDtrackerV1::BuildTrackingContainers()
1959{
1960// Building tracking containers for clusters
1961
1962 Int_t nin =0, icl = fClusters->GetEntriesFast();
41702fec 1963 while (icl--) {
1964 AliTRDcluster *c = (AliTRDcluster *) fClusters->UncheckedAt(icl);
1965 if(c->IsInChamber()) nin++;
4226b195 1966 if(fkReconstructor->IsHLT()) c->SetRPhiMethod(AliTRDcluster::kCOG);
41702fec 1967 Int_t detector = c->GetDetector();
1968 Int_t sector = fGeom->GetSector(detector);
053767a4 1969 Int_t stack = fGeom->GetStack(detector);
1970 Int_t layer = fGeom->GetLayer(detector);
41702fec 1971
053767a4 1972 fTrSec[sector].GetChamber(stack, layer, kTRUE)->InsertCluster(c, icl);
41702fec 1973 }
b0a48c4d 1974
1975 const AliTRDCalDet *cal = AliTRDcalibDB::Instance()->GetT0Det();
053767a4 1976 for(int isector =0; isector<AliTRDgeometry::kNsector; isector++){
41702fec 1977 if(!fTrSec[isector].GetNChambers()) continue;
4d6aee34 1978 fTrSec[isector].Init(fkReconstructor, cal);
41702fec 1979 }
66f6bfd9 1980
1981 return nin;
eb38ed55 1982}
1983
1984
66f6bfd9 1985
0906e73e 1986//____________________________________________________________________
172b6f82 1987void AliTRDtrackerV1::UnloadClusters()
0906e73e 1988{
d4cf71ca 1989//
1990// Clears the arrays of clusters and tracks. Resets sectors and timebins
1991// If option "force" is also set the containers are also deleted. This is useful
1992// in case of HLT
1993
1994 if(fTracks){
1995 fTracks->Delete();
4d6aee34 1996 if(HasRemoveContainers()){delete fTracks; fTracks = NULL;}
d4cf71ca 1997 }
1998 if(fTracklets){
1999 fTracklets->Delete();
4d6aee34 2000 if(HasRemoveContainers()){delete fTracklets; fTracklets = NULL;}
d4cf71ca 2001 }
48f8adf3 2002 if(fClusters){
2003 if(IsClustersOwner()) fClusters->Delete();
2004
2005 // save clusters array in the reconstructor for further use.
4d6aee34 2006 if(!fkReconstructor->IsWritingClusters()){
48f8adf3 2007 AliTRDReconstructor::SetClusters(fClusters);
2008 SetClustersOwner(kFALSE);
4d6aee34 2009 } else AliTRDReconstructor::SetClusters(NULL);
48f8adf3 2010 }
0906e73e 2011
053767a4 2012 for (int i = 0; i < AliTRDgeometry::kNsector; i++) fTrSec[i].Clear();
0906e73e 2013
41702fec 2014 // Increment the Event Number
2015 AliTRDtrackerDebug::SetEventNumber(AliTRDtrackerDebug::GetEventNumber() + 1);
eb38ed55 2016}
0906e73e 2017
fac58f00 2018// //____________________________________________________________________
2019// void AliTRDtrackerV1::UseClusters(const AliKalmanTrack *t, Int_t) const
2020// {
2021// const AliTRDtrackV1 *track = dynamic_cast<const AliTRDtrackV1*>(t);
2022// if(!track) return;
2023//
4d6aee34 2024// AliTRDseedV1 *tracklet = NULL;
fac58f00 2025// for(Int_t ily=AliTRDgeometry::kNlayer; ily--;){
2026// if(!(tracklet = track->GetTracklet(ily))) continue;
4d6aee34 2027// AliTRDcluster *c = NULL;
8d2bec9e 2028// for(Int_t ic=AliTRDseed::kNclusters; ic--;){
fac58f00 2029// if(!(c=tracklet->GetClusters(ic))) continue;
2030// c->Use();
2031// }
2032// }
2033// }
2034//
b1957d3c 2035
eb38ed55 2036//_____________________________________________________________________________
4d6aee34 2037Bool_t AliTRDtrackerV1::AdjustSector(AliTRDtrackV1 *const track)
eb38ed55 2038{
41702fec 2039 //
2040 // Rotates the track when necessary
2041 //
2042
2043 Double_t alpha = AliTRDgeometry::GetAlpha();
2044 Double_t y = track->GetY();
2045 Double_t ymax = track->GetX()*TMath::Tan(0.5*alpha);
3cfaffa4 2046
41702fec 2047 if (y > ymax) {
2048 if (!track->Rotate( alpha)) {
2049 return kFALSE;
2050 }
2051 }
2052 else if (y < -ymax) {
2053 if (!track->Rotate(-alpha)) {
2054 return kFALSE;
2055 }
2056 }
2057
2058 return kTRUE;
0906e73e 2059
2060}
2061
eb38ed55 2062
0906e73e 2063//____________________________________________________________________
4d6aee34 2064AliTRDseedV1* AliTRDtrackerV1::GetTracklet(AliTRDtrackV1 *const track, Int_t p, Int_t &idx)
0906e73e 2065{
41702fec 2066 // Find tracklet for TRD track <track>
2067 // Parameters
2068 // - track
2069 // - sector
2070 // - plane
2071 // - index
2072 // Output
2073 // tracklet
2074 // index
2075 // Detailed description
2076 //
2077 idx = track->GetTrackletIndex(p);
17896e82 2078 AliTRDseedV1 *tracklet = (idx<0) ? NULL : (AliTRDseedV1*)fTracklets->UncheckedAt(idx);
41702fec 2079
2080 return tracklet;
0906e73e 2081}
2082
2083//____________________________________________________________________
4d6aee34 2084AliTRDseedV1* AliTRDtrackerV1::SetTracklet(const AliTRDseedV1 * const tracklet)
0906e73e 2085{
41702fec 2086 // Add this tracklet to the list of tracklets stored in the tracker
2087 //
2088 // Parameters
2089 // - tracklet : pointer to the tracklet to be added to the list
2090 //
2091 // Output
2092 // - the index of the new tracklet in the tracker tracklets list
2093 //
2094 // Detailed description
2095 // Build the tracklets list if it is not yet created (late initialization)
2096 // and adds the new tracklet to the list.
2097 //
2098 if(!fTracklets){
053767a4 2099 fTracklets = new TClonesArray("AliTRDseedV1", AliTRDgeometry::Nsector()*kMaxTracksStack);
41702fec 2100 fTracklets->SetOwner(kTRUE);
2101 }
2102 Int_t nentries = fTracklets->GetEntriesFast();
2103 return new ((*fTracklets)[nentries]) AliTRDseedV1(*tracklet);
972ef65e 2104}
2105
d20df6fc 2106//____________________________________________________________________
4d6aee34 2107AliTRDtrackV1* AliTRDtrackerV1::SetTrack(const AliTRDtrackV1 * const track)
d20df6fc 2108{
2109 // Add this track to the list of tracks stored in the tracker
2110 //
2111 // Parameters
2112 // - track : pointer to the track to be added to the list
2113 //
2114 // Output
2115 // - the pointer added
2116 //
2117 // Detailed description
2118 // Build the tracks list if it is not yet created (late initialization)
2119 // and adds the new track to the list.
2120 //
2121 if(!fTracks){
053767a4 2122 fTracks = new TClonesArray("AliTRDtrackV1", AliTRDgeometry::Nsector()*kMaxTracksStack);
d20df6fc 2123 fTracks->SetOwner(kTRUE);
2124 }
2125 Int_t nentries = fTracks->GetEntriesFast();
2126 return new ((*fTracks)[nentries]) AliTRDtrackV1(*track);
2127}
2128
2129
0906e73e 2130
e4f2f73d 2131//____________________________________________________________________
eb38ed55 2132Int_t AliTRDtrackerV1::Clusters2TracksSM(Int_t sector, AliESDEvent *esd)
e4f2f73d 2133{
41702fec 2134 //
2135 // Steer tracking for one SM.
2136 //
2137 // Parameters :
2138 // sector : Array of (SM) propagation layers containing clusters
2139 // esd : The current ESD event. On output it contains the also
2140 // the ESD (TRD) tracks found in this SM.
2141 //
2142 // Output :
2143 // Number of tracks found in this TRD supermodule.
2144 //
2145 // Detailed description
2146 //
2147 // 1. Unpack AliTRDpropagationLayers objects for each stack.
2148 // 2. Launch stack tracking.
2149 // See AliTRDtrackerV1::Clusters2TracksStack() for details.
2150 // 3. Pack results in the ESD event.
2151 //
2152
41702fec 2153 Int_t nTracks = 0;
2154 Int_t nChambers = 0;
4d6aee34 2155 AliTRDtrackingChamber **stack = NULL, *chamber = NULL;
053767a4 2156 for(int istack = 0; istack<AliTRDgeometry::kNstack; istack++){
41702fec 2157 if(!(stack = fTrSec[sector].GetStack(istack))) continue;
2158 nChambers = 0;
053767a4 2159 for(int ilayer=0; ilayer<AliTRDgeometry::kNlayer; ilayer++){
2160 if(!(chamber = stack[ilayer])) continue;
9e85cb05 2161 if(chamber->GetNClusters() < fgNTimeBins * fkRecoParam->GetFindableClusters()) continue;
41702fec 2162 nChambers++;
053767a4 2163 //AliInfo(Form("sector %d stack %d layer %d clusters %d", sector, istack, ilayer, chamber->GetNClusters()));
41702fec 2164 }
2165 if(nChambers < 4) continue;
2166 //AliInfo(Form("Doing stack %d", istack));
b1135f96 2167 nTracks += Clusters2TracksStack(stack, fTracksESD);
41702fec 2168 }
050875b0 2169 if(nTracks) AliDebug(2, Form("Number of tracks: SM_%02d[%d]", sector, nTracks));
2170
352cef8f 2171 for(int itrack=0; itrack<nTracks; itrack++){
2172 AliESDtrack *esdTrack((AliESDtrack*)(fTracksESD->operator[](itrack)));
2173 Int_t id = esd->AddTrack(esdTrack);
2174
2175 // set ESD id to stand alone TRD tracks
9e85cb05 2176 if (fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 0){
352cef8f 2177 esdTrack=esd->GetTrack(id);
2178 TObject *o(NULL); Int_t ic(0);
2179 AliTRDtrackV1 *calibTrack(NULL);
2180 while((o = esdTrack->GetCalibObject(ic++))){
2181 if(!(calibTrack = dynamic_cast<AliTRDtrackV1*>(o))) continue;
2182 calibTrack->SetESDid(esdTrack->GetID());
2183 break;
2184 }
2185 }
2186 }
41702fec 2187
2188 // Reset Track and Candidate Number
2189 AliTRDtrackerDebug::SetCandidateNumber(0);
2190 AliTRDtrackerDebug::SetTrackNumber(0);
b1135f96 2191
2192 // delete ESD tracks in the array
2193 fTracksESD->Delete();
41702fec 2194 return nTracks;
e4f2f73d 2195}
2196
2197//____________________________________________________________________
4d6aee34 2198Int_t AliTRDtrackerV1::Clusters2TracksStack(AliTRDtrackingChamber **stack, TClonesArray * const esdTrackList)
e4f2f73d 2199{
41702fec 2200 //
2201 // Make tracks in one TRD stack.
2202 //
2203 // Parameters :
2204 // layer : Array of stack propagation layers containing clusters
2205 // esdTrackList : Array of ESD tracks found by the stand alone tracker.
2206 // On exit the tracks found in this stack are appended.
2207 //
2208 // Output :
2209 // Number of tracks found in this stack.
2210 //
2211 // Detailed description
2212 //
2213 // 1. Find the 3 most useful seeding chambers. See BuildSeedingConfigs() for details.
2214 // 2. Steer AliTRDtrackerV1::MakeSeeds() for 3 seeding layer configurations.
2215 // See AliTRDtrackerV1::MakeSeeds() for more details.
2216 // 3. Arrange track candidates in decreasing order of their quality
2217 // 4. Classify tracks in 5 categories according to:
2218 // a) number of layers crossed
2219 // b) track quality
2220 // 5. Sign clusters by tracks in decreasing order of track quality
2221 // 6. Build AliTRDtrack out of seeding tracklets
2222 // 7. Cook MC label
2223 // 8. Build ESD track and register it to the output list
2224 //
2225
b0a48c4d 2226 const AliTRDCalDet *cal = AliTRDcalibDB::Instance()->GetT0Det();
4d6aee34 2227 AliTRDtrackingChamber *chamber = NULL;
2228 AliTRDtrackingChamber **ci = NULL;
41702fec 2229 AliTRDseedV1 sseed[kMaxTracksStack*6]; // to be initialized
2230 Int_t pars[4]; // MakeSeeds parameters
2231
2232 //Double_t alpha = AliTRDgeometry::GetAlpha();
2233 //Double_t shift = .5 * alpha;
2234 Int_t configs[kNConfigs];
2235
fac58f00 2236 // Purge used clusters from the containers
2237 ci = &stack[0];
2238 for(Int_t ic = kNPlanes; ic--; ci++){
2239 if(!(*ci)) continue;
2240 (*ci)->Update();
2241 }
2242
41702fec 2243 // Build initial seeding configurations
2244 Double_t quality = BuildSeedingConfigs(stack, configs);
9e85cb05 2245 if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 10){
41702fec 2246 AliInfo(Form("Plane config %d %d %d Quality %f"
2247 , configs[0], configs[1], configs[2], quality));
2248 }
d931f2aa 2249
41702fec 2250
2251 // Initialize contors
2252 Int_t ntracks, // number of TRD track candidates
2253 ntracks1, // number of registered TRD tracks/iter
2254 ntracks2 = 0; // number of all registered TRD tracks in stack
2255 fSieveSeeding = 0;
d931f2aa 2256
2257 // Get stack index
fac58f00 2258 Int_t ic = 0; ci = &stack[0];
2259 while(ic<kNPlanes && !(*ci)){ic++; ci++;}
2260 if(!(*ci)) return ntracks2;
2261 Int_t istack = fGeom->GetStack((*ci)->GetDetector());
d931f2aa 2262
41702fec 2263 do{
2264 // Loop over seeding configurations
2265 ntracks = 0; ntracks1 = 0;
2266 for (Int_t iconf = 0; iconf<3; iconf++) {
2267 pars[0] = configs[iconf];
2268 pars[1] = ntracks;
d931f2aa 2269 pars[2] = istack;
41702fec 2270 ntracks = MakeSeeds(stack, &sseed[6*ntracks], pars);
6e39bde4 2271 //AliInfo(Form("Number of Tracks after iteration step %d: %d\n", iconf, ntracks));
41702fec 2272 if(ntracks == kMaxTracksStack) break;
2273 }
980d5a2a 2274 AliDebug(2, Form("Candidate TRD tracks %d in iteration %d.", ntracks, fSieveSeeding));
41702fec 2275 if(!ntracks) break;
2276
2277 // Sort the seeds according to their quality
2278 Int_t sort[kMaxTracksStack];
2279 TMath::Sort(ntracks, fTrackQuality, sort, kTRUE);
68f9b6bd 2280 if(AliLog::GetDebugLevel("TRD", "AliTRDtrackerV1") > 2){
2281 AliDebug(3, "Track candidates classification:");
2282 for (Int_t it(0); it < ntracks; it++) {
2283 Int_t jt(sort[it]);
2284 printf(" %2d idx[%d] Quality[%e]\n", it, jt, fTrackQuality[jt]);
2285 }
2286 }
41702fec 2287
2288 // Initialize number of tracks so far and logic switches
2289 Int_t ntracks0 = esdTrackList->GetEntriesFast();
2290 Bool_t signedTrack[kMaxTracksStack];
2291 Bool_t fakeTrack[kMaxTracksStack];
2292 for (Int_t i=0; i<ntracks; i++){
2293 signedTrack[i] = kFALSE;
2294 fakeTrack[i] = kFALSE;
2295 }
2296 //AliInfo("Selecting track candidates ...");
2297
2298 // Sieve clusters in decreasing order of track quality
68f9b6bd 2299 Int_t jSieve(0), rejectedCandidates(0);
41702fec 2300 do{
41702fec 2301 // Check track candidates
68f9b6bd 2302 rejectedCandidates=0;
41702fec 2303 for (Int_t itrack = 0; itrack < ntracks; itrack++) {
804bb02e 2304 Int_t trackIndex = sort[itrack];
2305 if (signedTrack[trackIndex] || fakeTrack[trackIndex]) continue;
41702fec 2306
804bb02e 2307 // Calculate track parameters from tracklets seeds
804bb02e 2308 Int_t ncl = 0;
2309 Int_t nused = 0;
2310 Int_t nlayers = 0;
2311 Int_t findable = 0;
2312 for (Int_t jLayer = 0; jLayer < kNPlanes; jLayer++) {
2313 Int_t jseed = kNPlanes*trackIndex+jLayer;
68f9b6bd 2314 sseed[jseed].UpdateUsed();
804bb02e 2315 if(!sseed[jseed].IsOK()) continue;
68f9b6bd 2316 // check if primary candidate
f29f13a6 2317 if (TMath::Abs(sseed[jseed].GetYref(0) / sseed[jseed].GetX0()) < 0.158) findable++;
68f9b6bd 2318 ncl += sseed[jseed].GetN();
804bb02e 2319 nused += sseed[jseed].GetNUsed();
2320 nlayers++;
804bb02e 2321 }
2322
f29f13a6 2323 // Filter duplicated tracks
2324 if (nused > 30){
68f9b6bd 2325 AliDebug(4, Form("REJECTED : %d idx[%d] quality[%e] tracklets[%d] usedClusters[%d]", itrack, trackIndex, fTrackQuality[trackIndex], nlayers, nused));
f29f13a6 2326 fakeTrack[trackIndex] = kTRUE;
2327 continue;
2328 }
5ef88e00 2329 if (ncl>0 && Float_t(nused)/ncl >= .25){
68f9b6bd 2330 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 2331 fakeTrack[trackIndex] = kTRUE;
2332 continue;
2333 }
41702fec 2334
68f9b6bd 2335 AliDebug(4, Form("Candidate[%d] Quality[%e] Tracklets[%d] Findable[%d] Ncl[%d] Nused[%d]", trackIndex, fTrackQuality[trackIndex], nlayers, findable, ncl, nused));
2336
f29f13a6 2337 // Classify tracks
2338 Bool_t skip = kFALSE;
2339 switch(jSieve){
68f9b6bd 2340 case 0: // select 6 tracklets primary tracks, good quality
2341 if(nlayers > findable || nlayers < kNPlanes) {skip = kTRUE; break;}
f29f13a6 2342 if(TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -5.){skip = kTRUE; break;}
2343 break;
2344
68f9b6bd 2345 case 1: // select shorter primary tracks, good quality
2346 if(findable<4){skip = kTRUE; break;}
f29f13a6 2347 if(nlayers < findable){skip = kTRUE; break;}
2348 if(TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -4.){skip = kTRUE; break;}
2349 break;
2350
68f9b6bd 2351 case 2: // select 6 tracklets secondary tracks
2352 if(nlayers < kNPlanes) { skip = kTRUE; break;}
f29f13a6 2353 if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -6.0){skip = kTRUE; break;}
2354 break;
2355
68f9b6bd 2356 case 3: // select shorter tracks, good quality
2357 if (nlayers<4){skip = kTRUE; break;}
f29f13a6 2358 if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -5.){skip = kTRUE; break;}
2359 break;
2360
68f9b6bd 2361 case 4: // select anything with at least 4 tracklets
2362 if (nlayers<4){skip = kTRUE; break;}
f29f13a6 2363 //if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) - nused/(nlayers-3.0) < -15.0){skip = kTRUE; break;}
2364 break;
2365 }
2366 if(skip){
68f9b6bd 2367 rejectedCandidates++;
5ef88e00 2368 AliDebug(4, Form("REJECTED : %d idx[%d] quality[%e] tracklets[%d] usedClusters[%d]", itrack, trackIndex, fTrackQuality[trackIndex], nlayers, nused));
f29f13a6 2369 continue;
5ef88e00 2370 } else AliDebug(4, Form("ACCEPTED : %d idx[%d] quality[%e] tracklets[%d] usedClusters[%d]", itrack, trackIndex, fTrackQuality[trackIndex], nlayers, nused));
2371
f29f13a6 2372 signedTrack[trackIndex] = kTRUE;
2373
68f9b6bd 2374 AliTRDseedV1 *lseed =&sseed[trackIndex*kNPlanes];
2375 AliTRDtrackV1 *track = MakeTrack(lseed);
2376 if(!track){
2377 AliDebug(1, "Track building failed.");
2378 continue;
2379 } else {
2380 if(AliLog::GetDebugLevel("TRD", "AliTRDtrackerV1") > 1){
2381 Int_t ich = 0; while(!(chamber = stack[ich])) ich++;
2382 AliDebug(2, Form("Track pt=%7.2fGeV/c SM[%2d] Done.", track->Pt(), fGeom->GetSector(chamber->GetDetector())));
2383 }
2384 }
f29f13a6 2385
9e85cb05 2386 if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 1 && fkReconstructor->IsDebugStreaming()){
eb2b4f91 2387 //AliInfo(Form("Track %d [%d] nlayers %d trackQuality = %e nused %d, yref = %3.3f", itrack, trackIndex, nlayers, fTrackQuality[trackIndex], nused, trackParams[1]));
f29f13a6 2388
f29f13a6 2389 AliTRDseedV1 *dseed[6];
b82b4de1 2390 for(Int_t iseed = AliTRDgeometry::kNlayer; iseed--;) dseed[iseed] = new AliTRDseedV1(lseed[iseed]);
f29f13a6 2391
2392 //Int_t eventNrInFile = esd->GetEventNumberInFile();
f29f13a6 2393 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2394 Int_t trackNumber = AliTRDtrackerDebug::GetTrackNumber();
2395 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
a2fbb6ec 2396 TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
f29f13a6 2397 cstreamer << "Clusters2TracksStack"
68f9b6bd 2398 << "EventNumber=" << eventNumber
2399 << "TrackNumber=" << trackNumber
2400 << "CandidateNumber=" << candidateNumber
2401 << "Iter=" << fSieveSeeding
2402 << "Like=" << fTrackQuality[trackIndex]
2403 << "S0.=" << dseed[0]
2404 << "S1.=" << dseed[1]
2405 << "S2.=" << dseed[2]
2406 << "S3.=" << dseed[3]
2407 << "S4.=" << dseed[4]
2408 << "S5.=" << dseed[5]
2409 << "Ncl=" << ncl
2410 << "NLayers=" << nlayers
2411 << "Findable=" << findable
2412 << "NUsed=" << nused
f29f13a6 2413 << "\n";
2414 }
d877f55f 2415
68f9b6bd 2416
f29f13a6 2417 AliESDtrack *esdTrack = new ((*esdTrackList)[ntracks0++]) AliESDtrack();
2418 esdTrack->UpdateTrackParams(track, AliESDtrack::kTRDout);
2419 esdTrack->SetLabel(track->GetLabel());
2420 track->UpdateESDtrack(esdTrack);
2421 // write ESD-friends if neccessary
9e85cb05 2422 if (fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 0){
f29f13a6 2423 AliTRDtrackV1 *calibTrack = new AliTRDtrackV1(*track);
2424 calibTrack->SetOwner();
2425 esdTrack->AddCalibObject(calibTrack);
2426 }
2427 ntracks1++;
2428 AliTRDtrackerDebug::SetTrackNumber(AliTRDtrackerDebug::GetTrackNumber() + 1);
41702fec 2429 }
2430
2431 jSieve++;
68f9b6bd 2432 } while(jSieve<5 && rejectedCandidates); // end track candidates sieve
41702fec 2433 if(!ntracks1) break;
2434
2435 // increment counters
2436 ntracks2 += ntracks1;
4302c900 2437
4d6aee34 2438 if(fkReconstructor->IsHLT()) break;
41702fec 2439 fSieveSeeding++;
2440
2441 // Rebuild plane configurations and indices taking only unused clusters into account
2442 quality = BuildSeedingConfigs(stack, configs);
4d6aee34 2443 if(quality < 1.E-7) break; //fkReconstructor->GetRecoParam() ->GetPlaneQualityThreshold()) break;
41702fec 2444
2445 for(Int_t ip = 0; ip < kNPlanes; ip++){
2446 if(!(chamber = stack[ip])) continue;
b0a48c4d 2447 chamber->Build(fGeom, cal);//Indices(fSieveSeeding);
41702fec 2448 }
2449
9e85cb05 2450 if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 10){
41702fec 2451 AliInfo(Form("Sieve level %d Plane config %d %d %d Quality %f", fSieveSeeding, configs[0], configs[1], configs[2], quality));
2452 }
2453 } while(fSieveSeeding<10); // end stack clusters sieve
2454
2455
2456
2457 //AliInfo(Form("Registered TRD tracks %d in stack %d.", ntracks2, pars[1]));
2458
2459 return ntracks2;
e4f2f73d 2460}
2461
2462//___________________________________________________________________
eb38ed55 2463Double_t AliTRDtrackerV1::BuildSeedingConfigs(AliTRDtrackingChamber **stack, Int_t *configs)
e4f2f73d 2464{
41702fec 2465 //
2466 // Assign probabilities to chambers according to their
2467 // capability of producing seeds.
2468 //
2469 // Parameters :
2470 //
2471 // layers : Array of stack propagation layers for all 6 chambers in one stack
2472 // configs : On exit array of configuration indexes (see GetSeedingConfig()
2473 // for details) in the decreasing order of their seeding probabilities.
2474 //
2475 // Output :
2476 //
2477 // Return top configuration quality
2478 //
2479 // Detailed description:
2480 //
2481 // To each chamber seeding configuration (see GetSeedingConfig() for
2482 // the list of all configurations) one defines 2 quality factors:
2483 // - an apriori topological quality (see GetSeedingConfig() for details) and
2484 // - a data quality based on the uniformity of the distribution of
2485 // clusters over the x range (time bins population). See CookChamberQA() for details.
2486 // The overall chamber quality is given by the product of this 2 contributions.
2487 //
2488
eb2b4f91 2489 Double_t chamberQ[kNPlanes];memset(chamberQ, 0, kNPlanes*sizeof(Double_t));
4d6aee34 2490 AliTRDtrackingChamber *chamber = NULL;
41702fec 2491 for(int iplane=0; iplane<kNPlanes; iplane++){
2492 if(!(chamber = stack[iplane])) continue;
2493 chamberQ[iplane] = (chamber = stack[iplane]) ? chamber->GetQuality() : 0.;
2494 }
2495
eb2b4f91 2496 Double_t tconfig[kNConfigs];memset(tconfig, 0, kNConfigs*sizeof(Double_t));
2497 Int_t planes[] = {0, 0, 0, 0};
41702fec 2498 for(int iconf=0; iconf<kNConfigs; iconf++){
2499 GetSeedingConfig(iconf, planes);
2500 tconfig[iconf] = fgTopologicQA[iconf];
2501 for(int iplane=0; iplane<4; iplane++) tconfig[iconf] *= chamberQ[planes[iplane]];
2502 }
2503
2504 TMath::Sort((Int_t)kNConfigs, tconfig, configs, kTRUE);
2505 // AliInfo(Form("q[%d] = %f", configs[0], tconfig[configs[0]]));
2506 // AliInfo(Form("q[%d] = %f", configs[1], tconfig[configs[1]]));
2507 // AliInfo(Form("q[%d] = %f", configs[2], tconfig[configs[2]]));
2508
2509 return tconfig[configs[0]];
e4f2f73d 2510}
2511
2512//____________________________________________________________________
e17f4785 2513Int_t AliTRDtrackerV1::MakeSeeds(AliTRDtrackingChamber **stack, AliTRDseedV1 * const sseed, const Int_t * const ipar)
e4f2f73d 2514{
afa21247 2515//
2a3191bb 2516// Seed tracklets and build candidate TRD tracks. The procedure is used during barrel tracking to account for tracks which are
2517// either missed by TPC prolongation or conversions inside the TRD volume.
2518// For stand alone tracking the procedure is used to estimate all tracks measured by TRD.
afa21247 2519//
2520// Parameters :
2521// layers : Array of stack propagation layers containing clusters
2522// sseed : Array of empty tracklet seeds. On exit they are filled.
2523// ipar : Control parameters:
2524// ipar[0] -> seeding chambers configuration
2525// ipar[1] -> stack index
2526// ipar[2] -> number of track candidates found so far
2527//
2528// Output :
2529// Number of tracks candidates found.
2530//
2531// The following steps are performed:
2532// 1. Build seeding layers by collapsing all time bins from each of the four seeding chambers along the
2533// radial coordinate. See AliTRDtrackingChamber::GetSeedingLayer() for details. The chambers selection for seeding
2534// is described in AliTRDtrackerV1::Clusters2TracksStack().
2535// 2. Using the seeding clusters from the seeding layer (step 1) build combinatorics using the following algorithm:
2536// - for each seeding cluster in the lower seeding layer find
2537// - all seeding clusters in the upper seeding layer inside a road defined by a given phi angle. The angle
2538// is calculated on the minimum pt of tracks from vertex accesible to the stand alone tracker.
2539// - for each pair of two extreme seeding clusters select middle upper cluster using roads defined externally by the
2540// reco params
2541// - select last seeding cluster as the nearest to the linear approximation of the track described by the first three
2542// seeding clusters.
2543// The implementation of road calculation and cluster selection can be found in the functions AliTRDchamberTimeBin::BuildCond()
2544// and AliTRDchamberTimeBin::GetClusters().
2545// 3. Helix fit of the seeding clusters set. (see AliTRDtrackerFitter::FitRieman(AliTRDcluster**)). No tilt correction is
2546// performed at this level
2547// 4. Initialize seeding tracklets in the seeding chambers.
2548// 5. *Filter 0* Chi2 cut on the Y and Z directions. The threshold is set externally by the reco params.
2549// 6. Attach (true) clusters to seeding tracklets (see AliTRDseedV1::AttachClusters()) and fit tracklet (see
2550// AliTRDseedV1::Fit()). The number of used clusters used by current seeds should not exceed ... (25).
2551// 7. *Filter 1* Check if all 4 seeding tracklets are correctly constructed.
2552// 8. Helix fit of the clusters from the seeding tracklets with tilt correction. Refit tracklets using the new
2553// approximation of the track.
2554// 9. *Filter 2* Calculate likelihood of the track. (See AliTRDtrackerV1::CookLikelihood()). The following quantities are
2555// checked against the Riemann fit:
2556// - position resolution in y
2557// - angular resolution in the bending plane
2558// - likelihood of the number of clusters attached to the tracklet
2559// 10. Extrapolation of the helix fit to the other 2 chambers *non seeding* chambers:
2560// - Initialization of extrapolation tracklets with the fit parameters
2561// - Attach clusters to extrapolated tracklets
2562// - Helix fit of tracklets
2563// 11. Improve seeding tracklets quality by reassigning clusters based on the last parameters of the track
2564// See AliTRDtrackerV1::ImproveSeedQuality() for details.
2565// 12. Helix fit of all 6 seeding tracklets and chi2 calculation
2566// 13. Hyperplane fit and track quality calculation. See AliTRDtrackerFitter::FitHyperplane() for details.
2567// 14. Cooking labels for tracklets. Should be done only for MC
2568// 15. Register seeds.
2569//
2570// Authors:
2571// Marian Ivanov <M.Ivanov@gsi.de>
2572// Alexandru Bercuci <A.Bercuci@gsi.de>
2573// Markus Fasel <M.Fasel@gsi.de>
41702fec 2574
4d6aee34 2575 AliTRDtrackingChamber *chamber = NULL;
2576 AliTRDcluster *c[kNSeedPlanes] = {NULL, NULL, NULL, NULL}; // initilize seeding clusters
e17f4785 2577 AliTRDseedV1 *cseed = &sseed[0]; // initialize tracklets for first track
41702fec 2578 Int_t ncl, mcl; // working variable for looping over clusters
2579 Int_t index[AliTRDchamberTimeBin::kMaxClustersLayer], jndex[AliTRDchamberTimeBin::kMaxClustersLayer];
2580 // chi2 storage
2581 // chi2[0] = tracklet chi2 on the Z direction
2582 // chi2[1] = tracklet chi2 on the R direction
2583 Double_t chi2[4];
2584
afa21247 2585 // this should be data member of AliTRDtrack TODO
41702fec 2586 Double_t seedQuality[kMaxTracksStack];
2587
2588 // unpack control parameters
2589 Int_t config = ipar[0];
2590 Int_t ntracks = ipar[1];
d931f2aa 2591 Int_t istack = ipar[2];
41702fec 2592 Int_t planes[kNSeedPlanes]; GetSeedingConfig(config, planes);
afa21247 2593 Int_t planesExt[kNPlanes-kNSeedPlanes]; GetExtrapolationConfig(config, planesExt);
be24510a 2594
2595
41702fec 2596 // Init chambers geometry
41702fec 2597 Double_t hL[kNPlanes]; // Tilting angle
2598 Float_t padlength[kNPlanes]; // pad lenghts
dd8059a8 2599 Float_t padwidth[kNPlanes]; // pad widths
4d6aee34 2600 AliTRDpadPlane *pp = NULL;
41702fec 2601 for(int iplane=0; iplane<kNPlanes; iplane++){
2602 pp = fGeom->GetPadPlane(iplane, istack);
bb79ccd5 2603 hL[iplane] = TMath::Tan(TMath::DegToRad()*pp->GetTiltingAngle());
41702fec 2604 padlength[iplane] = pp->GetLengthIPad();
dd8059a8 2605 padwidth[iplane] = pp->GetWidthIPad();
41702fec 2606 }
2607
eb2b4f91 2608 // Init anode wire position for chambers
e165b64b 2609 Double_t x0[kNPlanes], // anode wire position
eb2b4f91 2610 driftLength = .5*AliTRDgeometry::AmThick() - AliTRDgeometry::DrThick(); // drift length
4d6aee34 2611 TGeoHMatrix *matrix = NULL;
eb2b4f91 2612 Double_t loc[] = {AliTRDgeometry::AnodePos(), 0., 0.};
2613 Double_t glb[] = {0., 0., 0.};
2614 AliTRDtrackingChamber **cIter = &stack[0];
a3743898 2615 for(int iLayer=0; iLayer<kNPlanes; iLayer++,cIter++){
eb2b4f91 2616 if(!(*cIter)) continue;
e165b64b 2617 if(!(matrix = fGeom->GetClusterMatrix((*cIter)->GetDetector()))){
2618 continue;
2619 x0[iLayer] = fgkX0[iLayer];
2620 }
eb2b4f91 2621 matrix->LocalToMaster(loc, glb);
2622 x0[iLayer] = glb[0];
2623 }
2624
980d5a2a 2625 AliDebug(2, Form("Making seeds Stack[%d] Config[%d] Tracks[%d]...", istack, config, ntracks));
41702fec 2626
d931f2aa 2627 // Build seeding layers
d611c74f 2628 ResetSeedTB();
41702fec 2629 Int_t nlayers = 0;
41702fec 2630 for(int isl=0; isl<kNSeedPlanes; isl++){
2631 if(!(chamber = stack[planes[isl]])) continue;
4d6aee34 2632 if(!chamber->GetSeedingLayer(fSeedTB[isl], fGeom, fkReconstructor)) continue;
41702fec 2633 nlayers++;
41702fec 2634 }
eb2b4f91 2635 if(nlayers < kNSeedPlanes) return ntracks;
41702fec 2636
2637
2638 // Start finding seeds
2639 Double_t cond0[4], cond1[4], cond2[4];
2640 Int_t icl = 0;
d611c74f 2641 while((c[3] = (*fSeedTB[3])[icl++])){
41702fec 2642 if(!c[3]) continue;
d611c74f 2643 fSeedTB[0]->BuildCond(c[3], cond0, 0);
2644 fSeedTB[0]->GetClusters(cond0, index, ncl);
41702fec 2645 //printf("Found c[3] candidates 0 %d\n", ncl);
2646 Int_t jcl = 0;
2647 while(jcl<ncl) {
d611c74f 2648 c[0] = (*fSeedTB[0])[index[jcl++]];
41702fec 2649 if(!c[0]) continue;
2650 Double_t dx = c[3]->GetX() - c[0]->GetX();
afa21247 2651 Double_t dzdx = (c[3]->GetZ() - c[0]->GetZ())/dx;
2652 Double_t dydx = (c[3]->GetY() - c[0]->GetY())/dx;
2653 fSeedTB[1]->BuildCond(c[0], cond1, 1, dzdx, dydx);
d611c74f 2654 fSeedTB[1]->GetClusters(cond1, jndex, mcl);
41702fec 2655 //printf("Found c[0] candidates 1 %d\n", mcl);
2656
2657 Int_t kcl = 0;
2658 while(kcl<mcl) {
d611c74f 2659 c[1] = (*fSeedTB[1])[jndex[kcl++]];
2660 if(!c[1]) continue;
afa21247 2661 fSeedTB[2]->BuildCond(c[1], cond2, 2, dzdx, dydx);
d611c74f 2662 c[2] = fSeedTB[2]->GetNearestCluster(cond2);
2663 //printf("Found c[1] candidate 2 %p\n", c[2]);
2664 if(!c[2]) continue;
980d5a2a 2665
2666 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].",
2667 c[0]->GetX(), c[0]->GetY(), c[0]->GetZ(),
2668 c[1]->GetX(), c[1]->GetY(), c[1]->GetZ(),
2669 c[2]->GetX(), c[2]->GetY(), c[2]->GetZ(),
2670 c[3]->GetX(), c[3]->GetY(), c[3]->GetZ()));
d611c74f 2671
804bb02e 2672 for (Int_t il = 0; il < kNPlanes; il++) cseed[il].Reset();
41702fec 2673
d611c74f 2674 FitRieman(c, chi2);
2675
d931f2aa 2676 AliTRDseedV1 *tseed = &cseed[0];
bb2db46c 2677 cIter = &stack[0];
2678 for(int iLayer=0; iLayer<kNPlanes; iLayer++, tseed++, cIter++){
2679 Int_t det = (*cIter) ? (*cIter)->GetDetector() : -1;
eb2b4f91 2680 tseed->SetDetector(det);
43d6ad34 2681 tseed->SetTilt(hL[iLayer]);
2682 tseed->SetPadLength(padlength[iLayer]);
dd8059a8 2683 tseed->SetPadWidth(padwidth[iLayer]);
4d6aee34 2684 tseed->SetReconstructor(fkReconstructor);
eb2b4f91 2685 tseed->SetX0(det<0 ? fR[iLayer]+driftLength : x0[iLayer]);
d611c74f 2686 tseed->Init(GetRiemanFitter());
f29f13a6 2687 tseed->SetStandAlone(kTRUE);
d611c74f 2688 }
2689
2690 Bool_t isFake = kFALSE;
9e85cb05 2691 if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) >= 2 && fkReconstructor->IsDebugStreaming()){
d611c74f 2692 if (c[0]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
2693 if (c[1]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
2694 if (c[2]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
2695
2696 Double_t xpos[4];
2697 for(Int_t l = 0; l < kNSeedPlanes; l++) xpos[l] = fSeedTB[l]->GetX();
2698 Float_t yref[4];
2699 for(int il=0; il<4; il++) yref[il] = cseed[planes[il]].GetYref(0);
2700 Int_t ll = c[3]->GetLabel(0);
2701 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2702 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2703 AliRieman *rim = GetRiemanFitter();
a2fbb6ec 2704 TTreeSRedirector &cs0 = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
d611c74f 2705 cs0 << "MakeSeeds0"
2706 <<"EventNumber=" << eventNumber
2707 <<"CandidateNumber=" << candidateNumber
2708 <<"isFake=" << isFake
2709 <<"config=" << config
2710 <<"label=" << ll
2711 <<"chi2z=" << chi2[0]
2712 <<"chi2y=" << chi2[1]
2713 <<"Y2exp=" << cond2[0]
2714 <<"Z2exp=" << cond2[1]
2715 <<"X0=" << xpos[0] //layer[sLayer]->GetX()
2716 <<"X1=" << xpos[1] //layer[sLayer + 1]->GetX()
2717 <<"X2=" << xpos[2] //layer[sLayer + 2]->GetX()
2718 <<"X3=" << xpos[3] //layer[sLayer + 3]->GetX()
2719 <<"yref0=" << yref[0]
2720 <<"yref1=" << yref[1]
2721 <<"yref2=" << yref[2]
2722 <<"yref3=" << yref[3]
2723 <<"c0.=" << c[0]
2724 <<"c1.=" << c[1]
2725 <<"c2.=" << c[2]
2726 <<"c3.=" << c[3]
2727 <<"Seed0.=" << &cseed[planes[0]]
2728 <<"Seed1.=" << &cseed[planes[1]]
2729 <<"Seed2.=" << &cseed[planes[2]]
2730 <<"Seed3.=" << &cseed[planes[3]]
2731 <<"RiemanFitter.=" << rim
2732 <<"\n";
2733 }
9e85cb05 2734 if(chi2[0] > fkRecoParam->GetChi2Z()/*7./(3. - sLayer)*//*iter*/){
980d5a2a 2735 AliDebug(3, Form("Filter on chi2Z [%f].", chi2[0]));
d611c74f 2736 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2737 continue;
2738 }
9e85cb05 2739 if(chi2[1] > fkRecoParam->GetChi2Y()/*1./(3. - sLayer)*//*iter*/){
980d5a2a 2740 AliDebug(3, Form("Filter on chi2Y [%f].", chi2[1]));
d611c74f 2741 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2742 continue;
2743 }
2744 //AliInfo("Passed chi2 filter.");
2745
2746 // try attaching clusters to tracklets
6e39bde4 2747 Int_t mlayers = 0;
980d5a2a 2748 AliTRDcluster *cl = NULL;
be24510a 2749 for(int iLayer=0; iLayer<kNSeedPlanes; iLayer++){
d611c74f 2750 Int_t jLayer = planes[iLayer];
980d5a2a 2751 Int_t nNotInChamber = 0;
f29f13a6 2752 if(!cseed[jLayer].AttachClusters(stack[jLayer], kTRUE)) continue;
980d5a2a 2753 if(/*fkReconstructor->IsHLT()*/kFALSE){
2754 cseed[jLayer].UpdateUsed();
2755 if(!cseed[jLayer].IsOK()) continue;
2756 }else{
2757 cseed[jLayer].Fit();
2758 cseed[jLayer].UpdateUsed();
2759 cseed[jLayer].ResetClusterIter();
2760 while((cl = cseed[jLayer].NextCluster())){
2761 if(!cl->IsInChamber()) nNotInChamber++;
2762 }
2763 //printf("clusters[%d], used[%d], not in chamber[%d]\n", cseed[jLayer].GetN(), cseed[jLayer].GetNUsed(), nNotInChamber);
2764 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
2765 }
d611c74f 2766 mlayers++;
2767 }
be24510a 2768
2769 if(mlayers < kNSeedPlanes){
980d5a2a 2770 AliDebug(2, Form("Found only %d tracklets out of %d. Skip.", mlayers, kNSeedPlanes));
be24510a 2771 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2772 continue;
2773 }
2774
2775 // temporary exit door for the HLT
4d6aee34 2776 if(fkReconstructor->IsHLT()){
be24510a 2777 // attach clusters to extrapolation chambers
2778 for(int iLayer=0; iLayer<kNPlanes-kNSeedPlanes; iLayer++){
2779 Int_t jLayer = planesExt[iLayer];
2780 if(!(chamber = stack[jLayer])) continue;
980d5a2a 2781 if(!cseed[jLayer].AttachClusters(chamber, kTRUE)) continue;
5f1ae1e7 2782 cseed[jLayer].Fit();
be24510a 2783 }
4302c900 2784 fTrackQuality[ntracks] = 1.; // dummy value
2785 ntracks++;
218ba867 2786 if(ntracks == kMaxTracksStack) return ntracks;
4302c900 2787 cseed += 6;
2788 continue;
2789 }
2790
be24510a 2791
f29f13a6 2792 // Update Seeds and calculate Likelihood
d611c74f 2793 // fit tracklets and cook likelihood
68f9b6bd 2794 Double_t chi2Vals[4];
2795 chi2Vals[0] = FitTiltedRieman(&cseed[0], kTRUE);
f29f13a6 2796 for(int iLayer=0; iLayer<kNSeedPlanes; iLayer++){
2797 Int_t jLayer = planes[iLayer];
2798 cseed[jLayer].Fit(kTRUE);
2799 }
91834b8d 2800 Double_t like = CookLikelihood(&cseed[0], planes); // to be checked
d611c74f 2801
9e85cb05 2802 if (TMath::Log(1.E-9 + like) < fkRecoParam->GetTrackLikelihood()){
980d5a2a 2803 AliDebug(3, Form("Filter on likelihood %f[%e].", TMath::Log(1.E-9 + like), like));
d611c74f 2804 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2805 continue;
2806 }
2807 //AliInfo(Form("Passed likelihood %f[%e].", TMath::Log(1.E-9 + like), like));
2808
2809 // book preliminary results
2810 seedQuality[ntracks] = like;
2811 fSeedLayer[ntracks] = config;/*sLayer;*/
2812
2813 // attach clusters to the extrapolation seeds
980d5a2a 2814 Int_t elayers(0);
be24510a 2815 for(int iLayer=0; iLayer<kNPlanes-kNSeedPlanes; iLayer++){
2816 Int_t jLayer = planesExt[iLayer];
d611c74f 2817 if(!(chamber = stack[jLayer])) continue;
d611c74f 2818
2819 // fit extrapolated seed
2820 if ((jLayer == 0) && !(cseed[1].IsOK())) continue;
2821 if ((jLayer == 5) && !(cseed[4].IsOK())) continue;
2822 AliTRDseedV1 pseed = cseed[jLayer];
f29f13a6 2823 if(!pseed.AttachClusters(chamber, kTRUE)) continue;
2824 pseed.Fit(kTRUE);
d611c74f 2825 cseed[jLayer] = pseed;
68f9b6bd 2826 chi2Vals[0] = FitTiltedRieman(cseed, kTRUE);
f29f13a6 2827 cseed[jLayer].Fit(kTRUE);
980d5a2a 2828 elayers++;
d611c74f 2829 }
2830
2831 // AliInfo("Extrapolation done.");
2832 // Debug Stream containing all the 6 tracklets
9e85cb05 2833 if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) >= 2 && fkReconstructor->IsDebugStreaming()){
a2fbb6ec 2834 TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
d611c74f 2835 TLinearFitter *tiltedRieman = GetTiltedRiemanFitter();
2836 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2837 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2838 cstreamer << "MakeSeeds1"
2839 << "EventNumber=" << eventNumber
2840 << "CandidateNumber=" << candidateNumber
2841 << "S0.=" << &cseed[0]
2842 << "S1.=" << &cseed[1]
2843 << "S2.=" << &cseed[2]
2844 << "S3.=" << &cseed[3]
2845 << "S4.=" << &cseed[4]
2846 << "S5.=" << &cseed[5]
2847 << "FitterT.=" << tiltedRieman
2848 << "\n";
2849 }
2850
9e85cb05 2851 if(fkRecoParam->HasImproveTracklets()){
68f9b6bd 2852 if(!ImproveSeedQuality(stack, cseed, chi2Vals[0])){
980d5a2a 2853 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
68f9b6bd 2854 AliDebug(3, "ImproveSeedQuality() failed.");
980d5a2a 2855 }
d611c74f 2856 }
d611c74f 2857
68f9b6bd 2858 // do track fitting with vertex constraint
2859 if(fkRecoParam->IsVertexConstrained()) chi2Vals[1] = FitTiltedRiemanConstraint(&cseed[0], GetZ());
2860 else chi2Vals[1] = -1.;
2861 chi2Vals[2] = GetChi2Z(&cseed[0]);
2862 chi2Vals[3] = GetChi2Phi(&cseed[0]);
2863
2864 // calculate track quality
2865 fTrackQuality[ntracks] = CalculateTrackLikelihood(&chi2Vals[0]);
fac58f00 2866
9e85cb05 2867 if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) >= 2 && fkReconstructor->IsDebugStreaming()){
a2fbb6ec 2868 TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
d611c74f 2869 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2870 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2871 TLinearFitter *fitterTC = GetTiltedRiemanFitterConstraint();
2872 TLinearFitter *fitterT = GetTiltedRiemanFitter();
91834b8d 2873 Int_t ncls = 0;
2874 for(Int_t iseed = 0; iseed < kNPlanes; iseed++){
2875 ncls += cseed[iseed].IsOK() ? cseed[iseed].GetN2() : 0;
2876 }
d611c74f 2877 cstreamer << "MakeSeeds2"
2878 << "EventNumber=" << eventNumber
2879 << "CandidateNumber=" << candidateNumber
2880 << "Chi2TR=" << chi2Vals[0]
2881 << "Chi2TC=" << chi2Vals[1]
2882 << "Nlayers=" << mlayers
91834b8d 2883 << "NClusters=" << ncls
d611c74f 2884 << "Like=" << like
2885 << "S0.=" << &cseed[0]
2886 << "S1.=" << &cseed[1]
2887 << "S2.=" << &cseed[2]
2888 << "S3.=" << &cseed[3]
2889 << "S4.=" << &cseed[4]
2890 << "S5.=" << &cseed[5]
d611c74f 2891 << "FitterT.=" << fitterT
2892 << "FitterTC.=" << fitterTC
2893 << "\n";
2894 }
68f9b6bd 2895 if(AliLog::GetDebugLevel("TRD", "AliTRDtrackerV1")){
2896 Double_t pt[]={0., 0.};
2897 for(Int_t il(0); il<kNPlanes; il++){
2898 if(!cseed[il].IsOK()) continue;
2899 pt[0] = GetBz()*kB2C/cseed[il].GetC();
2900 pt[1] = GetBz()*kB2C/cseed[il].GetC(1);
2901 break;
2902 }
2903 AliDebug(2, Form("Candidate[%2d] pt[%7.3f %7.3f] Q[%e]\n"
2904 " [0] x[%6.2f] n[%2d] nu[%d] OK[%c]\n"
2905 " [1] x[%6.2f] n[%2d] nu[%d] OK[%c]\n"
2906 " [2] x[%6.2f] n[%2d] nu[%d] OK[%c]\n"
2907 " [3] x[%6.2f] n[%2d] nu[%d] OK[%c]\n"
2908 " [4] x[%6.2f] n[%2d] nu[%d] OK[%c]\n"
2909 " [5] x[%6.2f] n[%2d] nu[%d] OK[%c]"
2910 , ntracks, pt[0], pt[1], fTrackQuality[ntracks]
2911 ,cseed[0].GetX(), cseed[0].GetN(), cseed[0].GetNUsed(), cseed[0].IsOK()?'y':'n'
2912 ,cseed[1].GetX(), cseed[1].GetN(), cseed[1].GetNUsed(), cseed[1].IsOK()?'y':'n'
2913 ,cseed[2].GetX(), cseed[2].GetN(), cseed[2].GetNUsed(), cseed[2].IsOK()?'y':'n'
2914 ,cseed[3].GetX(), cseed[3].GetN(), cseed[3].GetNUsed(), cseed[3].IsOK()?'y':'n'
2915 ,cseed[4].GetX(), cseed[4].GetN(), cseed[4].GetNUsed(), cseed[4].IsOK()?'y':'n'
2916 ,cseed[5].GetX(), cseed[5].GetN(), cseed[5].GetNUsed(), cseed[5].IsOK()?'y':'n'));
2917 }
d611c74f 2918 ntracks++;
2919 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2920 if(ntracks == kMaxTracksStack){
2921 AliWarning(Form("Number of seeds reached maximum allowed (%d) in stack.", kMaxTracksStack));
2922 return ntracks;
2923 }
2924 cseed += 6;
41702fec 2925 }
2926 }
2927 }
41702fec 2928
2929 return ntracks;
e4f2f73d 2930}
2931
2932//_____________________________________________________________________________
68f9b6bd 2933AliTRDtrackV1* AliTRDtrackerV1::MakeTrack(AliTRDseedV1 * const tracklet)
e4f2f73d 2934{
afa21247 2935//
2936// Build a TRD track out of tracklet candidates
2937//
2938// Parameters :
2939// seeds : array of tracklets
2940// params : array of track parameters as they are estimated by stand alone tracker. 7 elements.
2941// [0] - radial position of the track at reference point
2942// [1] - y position of the fit at [0]
2943// [2] - z position of the fit at [0]
2944// [3] - snp of the first tracklet
2945// [4] - tgl of the first tracklet
2946// [5] - curvature of the Riemann fit - 1/pt
2947// [6] - sector rotation angle
2948//
2949// Output :
2950// The TRD track.
2951//
2952// Initialize the TRD track based on the parameters of the fit and a parametric covariance matrix
2953// (diagonal with constant variance terms TODO - correct parameterization)
2954//
2955// In case of HLT just register the tracklets in the tracker and return values of the Riemann fit. For the
2956// offline case perform a full Kalman filter on the already found tracklets (see AliTRDtrackerV1::FollowBackProlongation()
2957// for details). Do also MC label calculation and PID if propagation successfully.
41702fec 2958
afa21247 2959
41702fec 2960 Double_t alpha = AliTRDgeometry::GetAlpha();
2961 Double_t shift = AliTRDgeometry::GetAlpha()/2.0;
41702fec 2962
68f9b6bd 2963 // find first good tracklet
2964 Int_t idx(0); while(idx<kNPlanes && !tracklet[idx].IsOK()) idx++;
2965 if(idx>2){ AliDebug(1, Form("Found suspect track start @ layer idx[%d]\n"
2966 " %c[0] x0[%f] n[%d] nu[%d] OK[%c]\n"
2967 " %c[1] x0[%f] n[%d] nu[%d] OK[%c]\n"
2968 " %c[2] x0[%f] n[%d] nu[%d] OK[%c]\n"
2969 " %c[3] x0[%f] n[%d] nu[%d] OK[%c]\n"
2970 " %c[4] x0[%f] n[%d] nu[%d] OK[%c]\n"
2971 " %c[5] x0[%f] n[%d] nu[%d] OK[%c]"
2972 ,idx
2973 ,idx==0?'*':' ', tracklet[0].GetX0(), tracklet[0].GetN(), tracklet[0].GetNUsed(), tracklet[0].IsOK()?'y':'n'
2974 ,idx==1?'*':' ', tracklet[1].GetX0(), tracklet[1].GetN(), tracklet[1].GetNUsed(), tracklet[1].IsOK()?'y':'n'
2975 ,idx==2?'*':' ', tracklet[2].GetX0(), tracklet[2].GetN(), tracklet[2].GetNUsed(), tracklet[2].IsOK()?'y':'n'
2976 ,idx==3?'*':' ', tracklet[3].GetX0(), tracklet[3].GetN(), tracklet[3].GetNUsed(), tracklet[3].IsOK()?'y':'n'
2977 ,idx==4?'*':' ', tracklet[4].GetX0(), tracklet[4].GetN(), tracklet[4].GetNUsed(), tracklet[4].IsOK()?'y':'n'
2978 ,idx==5?'*':' ', tracklet[5].GetX0(), tracklet[5].GetN(), tracklet[5].GetNUsed(), tracklet[5].IsOK()?'y':'n'));
2979 return NULL;
2980 }
2981
8def512c 2982 Double_t dx(5.);
2983 Double_t x(tracklet[idx].GetX0() - dx);
68f9b6bd 2984 // Build track parameters
2985 Double_t params[] = {
2986 tracklet[idx].GetYref(0) - dx*tracklet[idx].GetYref(1) // y
2987 ,tracklet[idx].GetZref(0) - dx*tracklet[idx].GetZref(1) // z
2988 ,TMath::Sin(TMath::ATan(tracklet[idx].GetYref(1))) // snp
2989 ,tracklet[idx].GetZref(1) / TMath::Sqrt(1. + tracklet[idx].GetYref(1) * tracklet[idx].GetYref(1)) // tgl
8def512c 2990 ,tracklet[idx].GetC(fkReconstructor->IsHLT()?1:0) // curvature -> 1/pt
68f9b6bd 2991 };
2992 Int_t sector(fGeom->GetSector(tracklet[idx].GetDetector()));
2993
2994 Double_t c[15];
afa21247 2995 c[ 0] = 0.2; // s^2_y
2996 c[ 1] = 0.0; c[ 2] = 2.0; // s^2_z
2997 c[ 3] = 0.0; c[ 4] = 0.0; c[ 5] = 0.02; // s^2_snp
2998 c[ 6] = 0.0; c[ 7] = 0.0; c[ 8] = 0.0; c[ 9] = 0.1; // s^2_tgl
68f9b6bd 2999 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
3000
3001 AliTRDtrackV1 track(tracklet, params, c, x, sector*alpha+shift);
41702fec 3002
4d6aee34 3003 AliTRDseedV1 *ptrTracklet = NULL;
9887cc9f 3004
3005 // skip Kalman filter for HLT
5f1ae1e7 3006 if(/*fkReconstructor->IsHLT()*/kFALSE){
9887cc9f 3007 for (Int_t jLayer = 0; jLayer < AliTRDgeometry::kNlayer; jLayer++) {
3008 track.UnsetTracklet(jLayer);
68f9b6bd 3009 ptrTracklet = &tracklet[jLayer];
9887cc9f 3010 if(!ptrTracklet->IsOK()) continue;
5f1ae1e7 3011 if(TMath::Abs(ptrTracklet->GetYref(1) - ptrTracklet->GetYfit(1)) >= .2) continue; // check this condition with Marian
9887cc9f 3012 ptrTracklet = SetTracklet(ptrTracklet);
f29f13a6 3013 ptrTracklet->UseClusters();
91834b8d 3014 track.SetTracklet(ptrTracklet, fTracklets->GetEntriesFast()-1);
3015 }
d78d7df0 3016 AliTRDtrackV1 *ptrTrack = SetTrack(&track);
799e38d7 3017 ptrTrack->CookPID();
5f1ae1e7 3018 ptrTrack->CookLabel(.9);
4d6aee34 3019 ptrTrack->SetReconstructor(fkReconstructor);
d78d7df0 3020 return ptrTrack;
91834b8d 3021 }
393fda1c 3022
b1135f96 3023 // prevent the error message in AliTracker::MeanMaterialBudget: "start point out of geometry"
68f9b6bd 3024 if(TMath::Abs(track.GetX()) + TMath::Abs(track.GetY()) + TMath::Abs(track.GetZ()) > 10000) return NULL;
17e0e535 3025
d20df6fc 3026 track.ResetCovariance(1);
e79f8eb0 3027 Int_t nc = TMath::Abs(FollowBackProlongation(track));
9e85cb05 3028 if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 5 && fkReconstructor->IsDebugStreaming()){
393fda1c 3029 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
3030 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
3031 Double_t p[5]; // Track Params for the Debug Stream
68f9b6bd 3032 track.GetExternalParameters(x, p);
a2fbb6ec 3033 TTreeSRedirector &cs = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
393fda1c 3034 cs << "MakeTrack"
3035 << "EventNumber=" << eventNumber
3036 << "CandidateNumber=" << candidateNumber
3037 << "nc=" << nc
68f9b6bd 3038 << "X=" << x
393fda1c 3039 << "Y=" << p[0]
3040 << "Z=" << p[1]
3041 << "snp=" << p[2]
3042 << "tnd=" << p[3]
3043 << "crv=" << p[4]
68f9b6bd 3044 << "Yin=" << params[0]
3045 << "Zin=" << params[1]
3046 << "snpin=" << params[2]
3047 << "tndin=" << params[3]
3048 << "crvin=" << params[4]
393fda1c 3049 << "track.=" << &track
3050 << "\n";
3051 }
68f9b6bd 3052 if (nc < 30){
3053 UnsetTrackletsTrack(&track);
3054 return NULL;
3055 }
d20df6fc 3056 AliTRDtrackV1 *ptrTrack = SetTrack(&track);
4d6aee34 3057 ptrTrack->SetReconstructor(fkReconstructor);
48f8adf3 3058 ptrTrack->CookLabel(.9);
68f9b6bd 3059 for(Int_t il(kNPlanes); il--;){
3060 if(!(ptrTracklet = ptrTrack->GetTracklet(il))) continue;
3061 ptrTracklet->UseClusters();
3062 }
3063
d20df6fc 3064 // computes PID for track
3065 ptrTrack->CookPID();
3066 // update calibration references using this track
48f8adf3 3067 AliTRDCalibraFillHisto *calibra = AliTRDCalibraFillHisto::Instance();
3068 if (!calibra){
3069 AliInfo("Could not get Calibra instance\n");
3070 if(calibra->GetHisto2d()) calibra->UpdateHistogramsV1(ptrTrack);
3071 }
d20df6fc 3072 return ptrTrack;
e4f2f73d 3073}
3074
0906e73e 3075
3076//____________________________________________________________________
68f9b6bd 3077Bool_t AliTRDtrackerV1::ImproveSeedQuality(AliTRDtrackingChamber **stack, AliTRDseedV1 *cseed, Double_t &chi2)
e4f2f73d 3078{
41702fec 3079 //
3080 // Sort tracklets according to "quality" and try to "improve" the first 4 worst
3081 //
3082 // Parameters :
3083 // layers : Array of propagation layers for a stack/supermodule
3084 // cseed : Array of 6 seeding tracklets which has to be improved
3085 //
f29f13a6 3086 // Output :
41702fec 3087 // cssed : Improved seeds
3088 //
3089 // Detailed description
3090 //
3091 // Iterative procedure in which new clusters are searched for each
3092 // tracklet seed such that the seed quality (see AliTRDseed::GetQuality())
3093 // can be maximized. If some optimization is found the old seeds are replaced.
3094 //
3095 // debug level: 7
3096 //
3097
3098 // make a local working copy
4d6aee34 3099 AliTRDtrackingChamber *chamber = NULL;
980d5a2a 3100 AliTRDseedV1 bseed[AliTRDgeometry::kNlayer];
3101
68f9b6bd 3102 Float_t quality(1.e3),
980d5a2a 3103 lQuality[] = {1.e3, 1.e3, 1.e3, 1.e3, 1.e3, 1.e3};
3104 Int_t rLayers(0);
3105 for(Int_t jLayer=AliTRDgeometry::kNlayer; jLayer--;){
3106 bseed[jLayer] = cseed[jLayer];
3107 if(!bseed[jLayer].IsOK()) continue;
3108 rLayers++;
3109 lQuality[jLayer] = bseed[jLayer].GetQuality(kTRUE);
3110 quality += lQuality[jLayer];
3111 }
68f9b6bd 3112 quality /= rLayers;
3113 AliDebug(2, Form("Start N[%d] Q[%f] chi2[%f]", rLayers, quality, chi2));
41702fec 3114
3115 for (Int_t iter = 0; iter < 4; iter++) {
980d5a2a 3116 // Try better cluster set
3117 Int_t nLayers(0); Float_t qualitynew(0.);
3118 Int_t indexes[6];
3119 TMath::Sort(Int_t(AliTRDgeometry::kNlayer), lQuality, indexes, kFALSE);
3120 for(Int_t jLayer=AliTRDgeometry::kNlayer; jLayer--;) {
3121 Int_t bLayer = indexes[jLayer];
3122 bseed[bLayer].Reset("c");
41702fec 3123 if(!(chamber = stack[bLayer])) continue;
980d5a2a 3124 if(!bseed[bLayer].AttachClusters(chamber, kTRUE)) continue;
f29f13a6 3125 bseed[bLayer].Fit(kTRUE);
980d5a2a 3126