Temporary fix for bug #70102: Arithmetic exception in AliTRDtrackerV1::FitTiltedRieman
[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)));
2eb10c34 343 track.SetPrimary(status & AliESDtrack::kTPCin);
eb2b4f91 344 expectedClr = FollowBackProlongation(track);
345 // check if track entered the TRD fiducial volume
a310e49b 346 if(track.GetTrackIn()){
eb2b4f91 347 seed->UpdateTrackParams(&track, AliESDtrack::kTRDin);
348 nTRDseeds++;
349 }
350 // check if track was stopped in the TRD
351 if (expectedClr<0){
352 seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
353 continue;
354 }
ae3fbe1f 355
356 if(expectedClr){
eb2b4f91 357 nFound++;
41702fec 358 // computes PID for track
359 track.CookPID();
360 // update calibration references using this track
361 if(calibra->GetHisto2d()) calibra->UpdateHistogramsV1(&track);
362 // save calibration object
2d73d21c 363 if (fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 0) {
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
2d73d21c 507 if (fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 0){
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);
ef867f55 615 if (chi2 < 1e+10 && ((AliExternalTrackParam&)t).Update(p, cov)){
616 // Register info to track
617 t.SetNumberOfClusters();
618 t.UpdateChi2(chi2);
41702fec 619 nClustersExpected += tracklet->GetN();
620 }
621 }
622
9e85cb05 623 if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 1){
41702fec 624 Int_t index;
51a23065 625 for(int iplane=0; iplane<AliTRDgeometry::kNlayer; iplane++){
41702fec 626 AliTRDseedV1 *tracklet = GetTracklet(&t, iplane, index);
627 if(!tracklet) continue;
628 t.SetTracklet(tracklet, index);
629 }
630
a2fbb6ec 631 if(fkReconstructor->IsDebugStreaming()){
632 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
633 TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
634 AliTRDtrackV1 track(t);
635 track.SetOwner();
636 cstreamer << "FollowProlongation"
637 << "EventNumber=" << eventNumber
638 << "ncl=" << nClustersExpected
639 << "track.=" << &track
640 << "\n";
641 }
41702fec 642 }
41702fec 643 return nClustersExpected;
0906e73e 644
645}
646
647//_____________________________________________________________________________
648Int_t AliTRDtrackerV1::FollowBackProlongation(AliTRDtrackV1 &t)
649{
afa21247 650// Extrapolates/Build the TRD track in the TOF direction.
651//
652// Parameters
653// t : the TRD track which has to be extrapolated
654//
655// Output
656// number of clusters attached to the track
657//
658// Starting from current radial position of track <t> this function
659// extrapolates the track through the 6 TRD layers. The following steps
660// are being performed for each plane:
661// 1. Propagate track to the entrance of the next chamber:
662// - get chamber limits in the radial direction
663// - check crossing sectors
664// - check track inclination
665// - check track prolongation against boundary conditions (see exclusion boundaries on AliTRDgeometry::IsOnBoundary())
666// 2. Build tracklet (see AliTRDseed::AttachClusters() for details) for this layer if needed. If only
667// Kalman filter is needed and tracklets are already linked to the track this step is skipped.
668// 3. Fit tracklet using the information from the Kalman filter.
669// 4. Propagate and update track at reference radial position of the tracklet.
670// 5. Register tracklet with the tracker and track; update pulls monitoring.
671//
672// Observation
2a3191bb 673// 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:
674// - AliTRDtrackV1::kProlongation : track prolongation failed
675// - AliTRDtrackV1::kPropagation : track prolongation failed
676// - AliTRDtrackV1::kAdjustSector : failed during sector crossing
677// - AliTRDtrackV1::kSnp : too large bending
678// - AliTRDtrackV1::kTrackletInit : fail to initialize tracklet
679// - AliTRDtrackV1::kUpdate : fail to attach clusters or fit the tracklet
680// - AliTRDtrackV1::kUnknown : anything which is not covered before
afa21247 681// 2. By default the status of the track before first TRD update is saved.
682//
683// Debug level 2
684//
685// Author
686// Alexandru Bercuci <A.Bercuci@gsi.de>
687//
41702fec 688
eb2b4f91 689 Int_t n = 0;
690 Double_t driftLength = .5*AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick();
4d6aee34 691 AliTRDtrackingChamber *chamber = NULL;
41702fec 692
9e85cb05 693 Int_t debugLevel = fkReconstructor->IsDebugStreaming() ? fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) : 0;
7c3eecb8 694 TTreeSRedirector *cstreamer = fkReconstructor->IsDebugStreaming() ? fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker) : 0x0;
695
68f9b6bd 696 Bool_t kStoreIn(kTRUE), //
697 kPropagateIn(kTRUE), //
698 kStandAlone(kFALSE), // toggle tracker awarness of stand alone seeding
699 kUseTRD(fkRecoParam->IsOverPtThreshold(t.Pt()));// use TRD measurment to update Kalman
700
701 Int_t startLayer(0);
4d6aee34 702 AliTRDseedV1 tracklet, *ptrTracklet = NULL;
68f9b6bd 703 // Special case for stand alone tracking
704 // - store all tracklets found by seeding
705 // - start propagation from first tracklet found
181d2c97 706 AliTRDseedV1 *tracklets[kNPlanes];
707 memset(tracklets, 0, sizeof(AliTRDseedV1 *) * kNPlanes);
68f9b6bd 708 for(Int_t ip(kNPlanes); ip--;){
709 if(!(tracklets[ip] = t.GetTracklet(ip))) continue;
181d2c97 710 t.UnsetTracklet(ip);
68f9b6bd 711 if(tracklets[ip]->IsOK()) startLayer=ip;
712 kStandAlone = kTRUE;
0b559d95 713 kUseTRD = kTRUE;
181d2c97 714 }
68f9b6bd 715 AliDebug(4, Form("SA[%c] Start[%d]\n"
716 " [0]idx[%d] traklet[%p]\n"
717 " [1]idx[%d] traklet[%p]\n"
718 " [2]idx[%d] traklet[%p]\n"
719 " [3]idx[%d] traklet[%p]\n"
720 " [4]idx[%d] traklet[%p]\n"
721 " [5]idx[%d] traklet[%p]"
722 , kStandAlone?'y':'n', startLayer
723 , t.GetTrackletIndex(0), (void*)tracklets[0]
724 , t.GetTrackletIndex(1), (void*)tracklets[1]
725 , t.GetTrackletIndex(2), (void*)tracklets[2]
726 , t.GetTrackletIndex(3), (void*)tracklets[3]
727 , t.GetTrackletIndex(4), (void*)tracklets[4]
728 , t.GetTrackletIndex(5), (void*)tracklets[5]));
e3cf3d02 729
053767a4 730 // Loop through the TRD layers
4d6aee34 731 TGeoHMatrix *matrix = NULL;
eb2b4f91 732 Double_t x, y, z;
68f9b6bd 733 for (Int_t ily=startLayer, sm=-1, stk=-1, det=-1; ily < AliTRDgeometry::kNlayer; ily++) {
1bd708e3 734 AliDebug(2, Form("Propagate to x[%d] = %7.2f", ily, fR[ily]));
735
eb2b4f91 736 // rough estimate of the entry point
737 if (!t.GetProlongation(fR[ily], y, z)){
738 n=-1;
739 t.SetStatus(AliTRDtrackV1::kProlongation);
1bd708e3 740 AliDebug(4, Form("Failed Rough Prolongation to ly[%d] x[%7.2f] y[%7.2f] z[%7.2f]", ily, fR[ily], y, z));
eb2b4f91 741 break;
742 }
41702fec 743
eb2b4f91 744 // find sector / stack / detector
745 sm = t.GetSector();
746 // TODO cross check with y value !
747 stk = fGeom->GetStack(z, ily);
748 det = stk>=0 ? AliTRDgeometry::GetDetector(ily, stk, sm) : -1;
4d6aee34 749 matrix = det>=0 ? fGeom->GetClusterMatrix(det) : NULL;
1bd708e3 750 AliDebug(3, Form("Propagate to det[%3d]", det));
eb2b4f91 751
752 // check if supermodule/chamber is installed
753 if( !fGeom->GetSMstatus(sm) ||
754 stk<0. ||
755 fGeom->IsHole(ily, stk, sm) ||
756 !matrix ){
1bd708e3 757 AliDebug(4, Form("Missing Geometry ly[%d]. Guess radial position", ily));
eb2b4f91 758 // propagate to the default radial position
759 if(fR[ily] > (fgkMaxStep + t.GetX()) && !PropagateToX(t, fR[ily], fgkMaxStep)){
760 n=-1;
761 t.SetStatus(AliTRDtrackV1::kPropagation);
1bd708e3 762 AliDebug(4, "Failed Propagation [Missing Geometry]");
41702fec 763 break;
764 }
eb2b4f91 765 if(!AdjustSector(&t)){
766 n=-1;
767 t.SetStatus(AliTRDtrackV1::kAdjustSector);
1bd708e3 768 AliDebug(4, "Failed Adjust Sector [Missing Geometry]");
eb2b4f91 769 break;
770 }
771 if(TMath::Abs(t.GetSnp()) > fgkMaxSnp){
772 n=-1;
773 t.SetStatus(AliTRDtrackV1::kSnp);
1bd708e3 774 AliDebug(4, "Failed Max Snp [Missing Geometry]");
eb2b4f91 775 break;
776 }
777 t.SetStatus(AliTRDtrackV1::kGeometry, ily);
41702fec 778 continue;
779 }
e3cf3d02 780
eb2b4f91 781 // retrieve rotation matrix for the current chamber
782 Double_t loc[] = {AliTRDgeometry::AnodePos()- driftLength, 0., 0.};
783 Double_t glb[] = {0., 0., 0.};
784 matrix->LocalToMaster(loc, glb);
785
786 // Propagate to the radial distance of the current layer
787 x = glb[0] - fgkMaxStep;
788 if(x > (fgkMaxStep + t.GetX()) && !PropagateToX(t, x, fgkMaxStep)){
789 n=-1;
790 t.SetStatus(AliTRDtrackV1::kPropagation);
1bd708e3 791 AliDebug(4, Form("Failed Initial Propagation to x[%7.2f]", x));
eb2b4f91 792 break;
793 }
794 if(!AdjustSector(&t)){
795 n=-1;
796 t.SetStatus(AliTRDtrackV1::kAdjustSector);
1bd708e3 797 AliDebug(4, "Failed Adjust Sector Start");
eb2b4f91 798 break;
799 }
800 if(TMath::Abs(t.GetSnp()) > fgkMaxSnp) {
801 n=-1;
802 t.SetStatus(AliTRDtrackV1::kSnp);
1bd708e3 803 AliDebug(4, Form("Failed Max Snp[%f] MaxSnp[%f]", t.GetSnp(), fgkMaxSnp));
eb2b4f91 804 break;
805 }
4d6aee34 806 Bool_t doRecalculate = kFALSE;
eb2b4f91 807 if(sm != t.GetSector()){
808 sm = t.GetSector();
4d6aee34 809 doRecalculate = kTRUE;
eb2b4f91 810 }
811 if(stk != fGeom->GetStack(z, ily)){
812 stk = fGeom->GetStack(z, ily);
4d6aee34 813 doRecalculate = kTRUE;
eb2b4f91 814 }
4d6aee34 815 if(doRecalculate){
eb2b4f91 816 det = AliTRDgeometry::GetDetector(ily, stk, sm);
817 if(!(matrix = fGeom->GetClusterMatrix(det))){
818 t.SetStatus(AliTRDtrackV1::kGeometry, ily);
1bd708e3 819 AliDebug(4, Form("Failed Geometry Matrix ly[%d]", ily));
eb2b4f91 820 continue;
821 }
822 matrix->LocalToMaster(loc, glb);
823 x = glb[0] - fgkMaxStep;
824 }
825
826 // check if track is well inside fiducial volume
827 if (!t.GetProlongation(x+fgkMaxStep, y, z)) {
828 n=-1;
829 t.SetStatus(AliTRDtrackV1::kProlongation);
1bd708e3 830 AliDebug(4, Form("Failed Prolongation to x[%7.2f] y[%7.2f] z[%7.2f]", x+fgkMaxStep, y, z));
eb2b4f91 831 break;
832 }
833 if(fGeom->IsOnBoundary(det, y, z, .5)){
834 t.SetStatus(AliTRDtrackV1::kBoundary, ily);
1bd708e3 835 AliDebug(4, "Failed Track on Boundary");
eb2b4f91 836 continue;
837 }
838 // mark track as entering the FIDUCIAL volume of TRD
e3cf3d02 839 if(kStoreIn){
a310e49b 840 t.SetTrackIn();
e3cf3d02 841 kStoreIn = kFALSE;
842 }
b1957d3c 843
eb2b4f91 844 ptrTracklet = tracklets[ily];
845 if(!ptrTracklet){ // BUILD TRACKLET
1bd708e3 846 AliDebug(3, Form("Building tracklet det[%d]", det));
eb2b4f91 847 // check data in supermodule
848 if(!fTrSec[sm].GetNChambers()){
849 t.SetStatus(AliTRDtrackV1::kNoClusters, ily);
1bd708e3 850 AliDebug(4, "Failed NoClusters");
eb2b4f91 851 continue;
852 }
853 if(fTrSec[sm].GetX(ily) < 1.){
854 t.SetStatus(AliTRDtrackV1::kNoClusters, ily);
1bd708e3 855 AliDebug(4, "Failed NoX");
eb2b4f91 856 continue;
857 }
858
859 // check data in chamber
860 if(!(chamber = fTrSec[sm].GetChamber(stk, ily))){
861 t.SetStatus(AliTRDtrackV1::kNoClusters, ily);
1bd708e3 862 AliDebug(4, "Failed No Detector");
eb2b4f91 863 continue;
864 }
9e85cb05 865 if(chamber->GetNClusters() < fgNTimeBins*fkRecoParam ->GetFindableClusters()){
eb2b4f91 866 t.SetStatus(AliTRDtrackV1::kNoClusters, ily);
1bd708e3 867 AliDebug(4, "Failed Not Enough Clusters in Detector");
eb2b4f91 868 continue;
869 }
870 // build tracklet
871 ptrTracklet = new(&tracklet) AliTRDseedV1(det);
4d6aee34 872 ptrTracklet->SetReconstructor(fkReconstructor);
eb2b4f91 873 ptrTracklet->SetKink(t.IsKink());
2eb10c34 874 ptrTracklet->SetPrimary(t.IsPrimary());
eb2b4f91 875 ptrTracklet->SetPadPlane(fGeom->GetPadPlane(ily, stk));
876 ptrTracklet->SetX0(glb[0]+driftLength);
877 if(!tracklet.Init(&t)){
878 n=-1;
879 t.SetStatus(AliTRDtrackV1::kTrackletInit);
1bd708e3 880 AliDebug(4, "Failed Tracklet Init");
eb2b4f91 881 break;
882 }
883 if(!tracklet.AttachClusters(chamber, kTRUE)){
884 t.SetStatus(AliTRDtrackV1::kNoAttach, ily);
7c3eecb8 885 if(debugLevel>3){
886 AliTRDseedV1 trackletCp(*ptrTracklet);
887 UChar_t status(t.GetStatusTRD(ily));
888 (*cstreamer) << "FollowBackProlongation2"
889 <<"status=" << status
890 <<"tracklet.=" << &trackletCp
891 << "\n";
892 }
1bd708e3 893 AliDebug(4, "Failed Attach Clusters");
eb2b4f91 894 continue;
895 }
1bd708e3 896 AliDebug(3, Form("Number of Clusters in Tracklet: %d", tracklet.GetN()));
9e85cb05 897 if(tracklet.GetN() < fgNTimeBins*fkRecoParam ->GetFindableClusters()){
eb2b4f91 898 t.SetStatus(AliTRDtrackV1::kNoClustersTracklet, ily);
7c3eecb8 899 if(debugLevel>3){
900 AliTRDseedV1 trackletCp(*ptrTracklet);
901 UChar_t status(t.GetStatusTRD(ily));
902 (*cstreamer) << "FollowBackProlongation2"
903 <<"status=" << status
904 <<"tracklet.=" << &trackletCp
905 << "\n";
906 }
1bd708e3 907 AliDebug(4, "Failed N Clusters Attached");
eb2b4f91 908 continue;
909 }
910 ptrTracklet->UpdateUsed();
0217fcd0 911 } else AliDebug(2, Form("Use external tracklet ly[%d]", ily));
eb2b4f91 912 // propagate track to the radial position of the tracklet
68f9b6bd 913
2eb10c34 914 // fit tracklet
915 // tilt correction options
916 // 0 : no correction
917 // 2 : pseudo tilt correction
918 if(!ptrTracklet->Fit(2)){
eb2b4f91 919 t.SetStatus(AliTRDtrackV1::kNoFit, ily);
1bd708e3 920 AliDebug(4, "Failed Tracklet Fit");
eb2b4f91 921 continue;
922 }
923 x = ptrTracklet->GetX(); //GetX0();
924 if(x > (fgkMaxStep + t.GetX()) && !PropagateToX(t, x, fgkMaxStep)) {
925 n=-1;
926 t.SetStatus(AliTRDtrackV1::kPropagation);
1bd708e3 927 AliDebug(4, Form("Failed Propagation to Tracklet x[%7.2f]", x));
eb2b4f91 928 break;
929 }
930 if(!AdjustSector(&t)) {
931 n=-1;
932 t.SetStatus(AliTRDtrackV1::kAdjustSector);
1bd708e3 933 AliDebug(4, "Failed Adjust Sector");
eb2b4f91 934 break;
41702fec 935 }
eb2b4f91 936 if(TMath::Abs(t.GetSnp()) > fgkMaxSnp) {
937 n=-1;
938 t.SetStatus(AliTRDtrackV1::kSnp);
1bd708e3 939 AliDebug(4, Form("Failed Max Snp[%f] MaxSnp[%f]", t.GetSnp(), fgkMaxSnp));
eb2b4f91 940 break;
941 }
81a6494d 942 if(kPropagateIn){
a310e49b 943 t.SetTrackIn();
81a6494d 944 kPropagateIn = kFALSE;
945 }
b72f4eaf 946 Double_t cov[3]; ptrTracklet->GetCovAt(x, cov);
947 Double_t p[2] = { ptrTracklet->GetY(), ptrTracklet->GetZ()};
948 Double_t chi2 = ((AliExternalTrackParam)t).GetPredictedChi2(p, cov);
6e39bde4 949 // update Kalman with the TRD measurement
b72f4eaf 950 if(chi2>1e+10){ // TODO
eb2b4f91 951 t.SetStatus(AliTRDtrackV1::kChi2, ily);
7c3eecb8 952 if(debugLevel > 2){
953 UChar_t status(t.GetStatusTRD());
954 AliTRDseedV1 trackletCp(*ptrTracklet);
955 AliTRDtrackV1 trackCp(t);
956 trackCp.SetOwner();
957 (*cstreamer) << "FollowBackProlongation1"
958 << "status=" << status
959 << "tracklet.=" << &trackletCp
960 << "track.=" << &trackCp
961 << "\n";
962 }
1bd708e3 963 AliDebug(4, Form("Failed Chi2[%f]", chi2));
eb2b4f91 964 continue;
965 }
ef867f55 966 if(kUseTRD){
967 if(!((AliExternalTrackParam&)t).Update(p, cov)) {
968 n=-1;
969 t.SetStatus(AliTRDtrackV1::kUpdate);
970 if(debugLevel > 2){
971 UChar_t status(t.GetStatusTRD());
972 AliTRDseedV1 trackletCp(*ptrTracklet);
973 AliTRDtrackV1 trackCp(t);
974 trackCp.SetOwner();
975 (*cstreamer) << "FollowBackProlongation1"
976 << "status=" << status
977 << "tracklet.=" << &trackletCp
978 << "track.=" << &trackCp
979 << "\n";
980 }
981 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]));
982 break;
7c3eecb8 983 }
eb2b4f91 984 }
68f9b6bd 985 if(!kStandAlone) ptrTracklet->UseClusters();
b72f4eaf 986 // fill residuals ?!
987 AliTracker::FillResiduals(&t, p, cov, ptrTracklet->GetVolumeId());
988
eb2b4f91 989
990 // load tracklet to the tracker
16cca13f 991 ptrTracklet->Update(&t);
eb2b4f91 992 ptrTracklet = SetTracklet(ptrTracklet);
17896e82 993 Int_t index(fTracklets->GetEntriesFast()-1);
994 t.SetTracklet(ptrTracklet, index);
ef867f55 995 // Register info to track
996 t.SetNumberOfClusters();
997 t.UpdateChi2(chi2);
998
eb2b4f91 999 n += ptrTracklet->GetN();
17896e82 1000 AliDebug(2, Form("Setting Tracklet[%d] @ Idx[%d]", ily, index));
eb2b4f91 1001
41702fec 1002 // Reset material budget if 2 consecutive gold
eb2b4f91 1003// if(ilayer>0 && t.GetTracklet(ilayer-1) && ptrTracklet->GetN() + t.GetTracklet(ilayer-1)->GetN() > 20) t.SetBudget(2, 0.);
41702fec 1004
1005 // Make backup of the track until is gold
b453ef55 1006 Int_t failed(0);
68f9b6bd 1007 if(!kStandAlone && (failed = t.MakeBackupTrack())) AliDebug(2, Form("Failed backup on cut[%d]", failed));
9e85cb05 1008
053767a4 1009 } // end layers loop
eb2b4f91 1010 //printf("clusters[%d] chi2[%f] x[%f] status[%d ", n, t.GetChi2(), t.GetX(), t.GetStatusTRD());
1011 //for(int i=0; i<6; i++) printf("%d ", t.GetStatusTRD(i)); printf("]\n");
41702fec 1012
7c3eecb8 1013 if(debugLevel > 1){
41702fec 1014 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
eb2b4f91 1015 AliTRDtrackV1 track(t);
1016 track.SetOwner();
7c3eecb8 1017 (*cstreamer) << "FollowBackProlongation0"
eb2b4f91 1018 << "EventNumber=" << eventNumber
1019 << "ncl=" << n
1020 << "track.=" << &track
41702fec 1021 << "\n";
1022 }
1023
eb2b4f91 1024 return n;
0906e73e 1025}
1026
eb38ed55 1027//_________________________________________________________________________
4d6aee34 1028Float_t AliTRDtrackerV1::FitRieman(AliTRDseedV1 *tracklets, Double_t *chi2, Int_t *const planes){
41702fec 1029 //
1030 // Fits a Riemann-circle to the given points without tilting pad correction.
1031 // The fit is performed using an instance of the class AliRieman (equations
1032 // and transformations see documentation of this class)
1033 // Afterwards all the tracklets are Updated
1034 //
1035 // Parameters: - Array of tracklets (AliTRDseedV1)
1036 // - Storage for the chi2 values (beginning with direction z)
1037 // - Seeding configuration
1038 // Output: - The curvature
1039 //
1040 AliRieman *fitter = AliTRDtrackerV1::GetRiemanFitter();
1041 fitter->Reset();
1042 Int_t allplanes[] = {0, 1, 2, 3, 4, 5};
1043 Int_t *ppl = &allplanes[0];
1044 Int_t maxLayers = 6;
1045 if(planes){
1046 maxLayers = 4;
1047 ppl = planes;
1048 }
1049 for(Int_t il = 0; il < maxLayers; il++){
1050 if(!tracklets[ppl[il]].IsOK()) continue;
e3cf3d02 1051 fitter->AddPoint(tracklets[ppl[il]].GetX0(), tracklets[ppl[il]].GetYfit(0), tracklets[ppl[il]].GetZfit(0),1,10);
41702fec 1052 }
1053 fitter->Update();
1054 // Set the reference position of the fit and calculate the chi2 values
1055 memset(chi2, 0, sizeof(Double_t) * 2);
1056 for(Int_t il = 0; il < maxLayers; il++){
1057 // Reference positions
1058 tracklets[ppl[il]].Init(fitter);
1059
1060 // chi2
1061 if((!tracklets[ppl[il]].IsOK()) && (!planes)) continue;
1062 chi2[0] += tracklets[ppl[il]].GetChi2Y();
1063 chi2[1] += tracklets[ppl[il]].GetChi2Z();
1064 }
1065 return fitter->GetC();
eb38ed55 1066}
1067
1068//_________________________________________________________________________
1069void AliTRDtrackerV1::FitRieman(AliTRDcluster **seedcl, Double_t chi2[2])
1070{
41702fec 1071 //
1072 // Performs a Riemann helix fit using the seedclusters as spacepoints
1073 // Afterwards the chi2 values are calculated and the seeds are updated
1074 //
1075 // Parameters: - The four seedclusters
1076 // - The tracklet array (AliTRDseedV1)
1077 // - The seeding configuration
1078 // - Chi2 array
1079 //
1080 // debug level 2
1081 //
1082 AliRieman *fitter = AliTRDtrackerV1::GetRiemanFitter();
1083 fitter->Reset();
a3743898 1084 for(Int_t i = 0; i < 4; i++){
a3743898 1085 fitter->AddPoint(seedcl[i]->GetX(), seedcl[i]->GetY(), seedcl[i]->GetZ(), 1., 10.);
1086 }
41702fec 1087 fitter->Update();
1088
1089
1090 // Update the seed and calculated the chi2 value
1091 chi2[0] = 0; chi2[1] = 0;
1092 for(Int_t ipl = 0; ipl < kNSeedPlanes; ipl++){
1093 // chi2
1094 chi2[0] += (seedcl[ipl]->GetZ() - fitter->GetZat(seedcl[ipl]->GetX())) * (seedcl[ipl]->GetZ() - fitter->GetZat(seedcl[ipl]->GetX()));
1095 chi2[1] += (seedcl[ipl]->GetY() - fitter->GetYat(seedcl[ipl]->GetX())) * (seedcl[ipl]->GetY() - fitter->GetYat(seedcl[ipl]->GetX()));
1096 }
eb38ed55 1097}
1098
1099
1100//_________________________________________________________________________
1101Float_t AliTRDtrackerV1::FitTiltedRiemanConstraint(AliTRDseedV1 *tracklets, Double_t zVertex)
1102{
41702fec 1103 //
1104 // Fits a helix to the clusters. Pad tilting is considered. As constraint it is
1105 // assumed that the vertex position is set to 0.
1106 // This method is very usefull for high-pt particles
1107 // Basis for the fit: (x - x0)^2 + (y - y0)^2 - R^2 = 0
1108 // x0, y0: Center of the circle
1109 // Measured y-position: ymeas = y - tan(phiT)(zc - zt)
1110 // zc: center of the pad row
1111 // Equation which has to be fitted (after transformation):
1112 // a + b * u + e * v + 2*(ymeas + tan(phiT)(z - zVertex))*t = 0
1113 // Transformation:
1114 // t = 1/(x^2 + y^2)
1115 // u = 2 * x * t
1116 // v = 2 * x * tan(phiT) * t
1117 // Parameters in the equation:
1118 // a = -1/y0, b = x0/y0, e = dz/dx
1119 //
1120 // The Curvature is calculated by the following equation:
1121 // - curv = a/Sqrt(b^2 + 1) = 1/R
1122 // Parameters: - the 6 tracklets
1123 // - the Vertex constraint
1124 // Output: - the Chi2 value of the track
1125 //
1126 // debug level 5
1127 //
1128
1129 TLinearFitter *fitter = GetTiltedRiemanFitterConstraint();
1130 fitter->StoreData(kTRUE);
1131 fitter->ClearPoints();
4d6aee34 1132 AliTRDcluster *cl = NULL;
41702fec 1133
1134 Float_t x, y, z, w, t, error, tilt;
1135 Double_t uvt[2];
1136 Int_t nPoints = 0;
053767a4 1137 for(Int_t ilr = 0; ilr < AliTRDgeometry::kNlayer; ilr++){
1138 if(!tracklets[ilr].IsOK()) continue;
8d2bec9e 1139 for(Int_t itb = 0; itb < AliTRDseedV1::kNclusters; itb++){
053767a4 1140 if(!tracklets[ilr].IsUsable(itb)) continue;
1141 cl = tracklets[ilr].GetClusters(itb);
1742f24c 1142 if(!cl->IsInChamber()) continue;
41702fec 1143 x = cl->GetX();
1144 y = cl->GetY();
1145 z = cl->GetZ();
053767a4 1146 tilt = tracklets[ilr].GetTilt();
41702fec 1147 // Transformation
1148 t = 1./(x * x + y * y);
1149 uvt[0] = 2. * x * t;
1150 uvt[1] = 2. * x * t * tilt ;
1151 w = 2. * (y + tilt * (z - zVertex)) * t;
78b7d24c 1152 error = 2. * TMath::Sqrt(cl->GetSigmaY2()+tilt*tilt*cl->GetSigmaZ2()) * t;
41702fec 1153 fitter->AddPoint(uvt, w, error);
1154 nPoints++;
1155 }
1156 }
e17f4785 1157 fitter->Eval();
41702fec 1158
1159 // Calculate curvature
1160 Double_t a = fitter->GetParameter(0);
1161 Double_t b = fitter->GetParameter(1);
1162 Double_t curvature = a/TMath::Sqrt(b*b + 1);
1163
1164 Float_t chi2track = fitter->GetChisquare()/Double_t(nPoints);
1165 for(Int_t ip = 0; ip < AliTRDtrackerV1::kNPlanes; ip++)
68f9b6bd 1166 tracklets[ip].SetC(curvature, 1);
1167
1168 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 1169
a2fbb6ec 1170/* if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker()) >= 5){
41702fec 1171 //Linear Model on z-direction
1172 Double_t xref = CalculateReferenceX(tracklets); // Relative to the middle of the stack
1173 Double_t slope = fitter->GetParameter(2);
1174 Double_t zref = slope * xref;
1175 Float_t chi2Z = CalculateChi2Z(tracklets, zref, slope, xref);
1176 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
1177 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
4d6aee34 1178 TTreeSRedirector &treeStreamer = *fkReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
41702fec 1179 treeStreamer << "FitTiltedRiemanConstraint"
1180 << "EventNumber=" << eventNumber
1181 << "CandidateNumber=" << candidateNumber
1182 << "Curvature=" << curvature
1183 << "Chi2Track=" << chi2track
1184 << "Chi2Z=" << chi2Z
1185 << "zref=" << zref
1186 << "\n";
3a039a31 1187 }*/
41702fec 1188 return chi2track;
eb38ed55 1189}
1190
1191//_________________________________________________________________________
1192Float_t AliTRDtrackerV1::FitTiltedRieman(AliTRDseedV1 *tracklets, Bool_t sigError)
1193{
41702fec 1194 //
1195 // Performs a Riemann fit taking tilting pad correction into account
1196 // The equation of a Riemann circle, where the y position is substituted by the
1197 // measured y-position taking pad tilting into account, has to be transformed
1198 // into a 4-dimensional hyperplane equation
1199 // Riemann circle: (x-x0)^2 + (y-y0)^2 -R^2 = 0
1200 // Measured y-Position: ymeas = y - tan(phiT)(zc - zt)
1201 // zc: center of the pad row
1202 // zt: z-position of the track
1203 // The z-position of the track is assumed to be linear dependent on the x-position
1204 // Transformed equation: a + b * u + c * t + d * v + e * w - 2 * (ymeas + tan(phiT) * zc) * t = 0
1205 // Transformation: u = 2 * x * t
1206 // v = 2 * tan(phiT) * t
1207 // w = 2 * tan(phiT) * (x - xref) * t
1208 // t = 1 / (x^2 + ymeas^2)
1209 // Parameters: a = -1/y0
1210 // b = x0/y0
1211 // c = (R^2 -x0^2 - y0^2)/y0
1212 // d = offset
1213 // e = dz/dx
1214 // If the offset respectively the slope in z-position is impossible, the parameters are fixed using
1215 // results from the simple riemann fit. Afterwards the fit is redone.
1216 // The curvature is calculated according to the formula:
1217 // curv = a/(1 + b^2 + c*a) = 1/R
1218 //
1219 // Paramters: - Array of tracklets (connected to the track candidate)
1220 // - Flag selecting the error definition
1221 // Output: - Chi2 values of the track (in Parameter list)
1222 //
1223 TLinearFitter *fitter = GetTiltedRiemanFitter();
1224 fitter->StoreData(kTRUE);
1225 fitter->ClearPoints();
1226 AliTRDLeastSquare zfitter;
4d6aee34 1227 AliTRDcluster *cl = NULL;
41702fec 1228
1229 Double_t xref = CalculateReferenceX(tracklets);
6e39bde4 1230 Double_t x, y, z, t, tilt, dx, w, we, erry, errz;
1231 Double_t uvt[4], sumPolY[5], sumPolZ[3];
1232 memset(sumPolY, 0, sizeof(Double_t) * 5);
1233 memset(sumPolZ, 0, sizeof(Double_t) * 3);
41702fec 1234 Int_t nPoints = 0;
1235 // Containers for Least-square fitter
1236 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1237 if(!tracklets[ipl].IsOK()) continue;
ed15ef4f 1238 tilt = tracklets[ipl].GetTilt();
8d2bec9e 1239 for(Int_t itb = 0; itb < AliTRDseedV1::kNclusters; itb++){
41702fec 1240 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1742f24c 1241 if(!cl->IsInChamber()) continue;
c79857d5 1242 if (!tracklets[ipl].IsUsable(itb)) continue;
41702fec 1243 x = cl->GetX();
1244 y = cl->GetY();
1245 z = cl->GetZ();
41702fec 1246 dx = x - xref;
1247 // Transformation
1248 t = 1./(x*x + y*y);
1249 uvt[0] = 2. * x * t;
1250 uvt[1] = t;
1251 uvt[2] = 2. * tilt * t;
1252 uvt[3] = 2. * tilt * dx * t;
1253 w = 2. * (y + tilt*z) * t;
1254 // error definition changes for the different calls
1255 we = 2. * t;
78b7d24c 1256 we *= sigError ? TMath::Sqrt(cl->GetSigmaY2()+tilt*tilt*cl->GetSigmaZ2()) : 0.2;
41702fec 1257 fitter->AddPoint(uvt, w, we);
1258 zfitter.AddPoint(&x, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
6e39bde4 1259 // adding points for covariance matrix estimation
1260 erry = 1./(TMath::Sqrt(cl->GetSigmaY2()) + 0.1); // 0.1 is a systematic error (due to misalignment and miscalibration)
1261 erry *= erry;
1262 errz = 1./cl->GetSigmaZ2();
1263 for(Int_t ipol = 0; ipol < 5; ipol++){
1264 sumPolY[ipol] += erry;
1265 erry *= x;
1266 if(ipol < 3){
1267 sumPolZ[ipol] += errz;
1268 errz *= x;
1269 }
1270 }
41702fec 1271 nPoints++;
1272 }
1273 }
c08b1cc7 1274 if (fitter->Eval()) return 1.e10;
41702fec 1275 zfitter.Eval();
1276
1277 Double_t offset = fitter->GetParameter(3);
1278 Double_t slope = fitter->GetParameter(4);
1279
1280 // Linear fitter - not possible to make boundaries
1281 // Do not accept non possible z and dzdx combinations
1282 Bool_t acceptablez = kTRUE;
1283 Double_t zref = 0.0;
1284 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
1285 if(!tracklets[iLayer].IsOK()) continue;
1286 zref = offset + slope * (tracklets[iLayer].GetX0() - xref);
e3cf3d02 1287 if (TMath::Abs(tracklets[iLayer].GetZfit(0) - zref) > tracklets[iLayer].GetPadLength() * 0.5 + 1.0)
41702fec 1288 acceptablez = kFALSE;
1289 }
1290 if (!acceptablez) {
1291 Double_t dzmf = zfitter.GetFunctionParameter(1);
1292 Double_t zmf = zfitter.GetFunctionValue(&xref);
1293 fgTiltedRieman->FixParameter(3, zmf);
1294 fgTiltedRieman->FixParameter(4, dzmf);
e17f4785 1295 fitter->Eval();
41702fec 1296 fitter->ReleaseParameter(3);
1297 fitter->ReleaseParameter(4);
1298 offset = fitter->GetParameter(3);
1299 slope = fitter->GetParameter(4);
1300 }
1301
1302 // Calculate Curvarture
1303 Double_t a = fitter->GetParameter(0);
1304 Double_t b = fitter->GetParameter(1);
1305 Double_t c = fitter->GetParameter(2);
1306 Double_t curvature = 1.0 + b*b - c*a;
68f9b6bd 1307 if (curvature > 0.0) curvature = a / TMath::Sqrt(curvature);
41702fec 1308
1309 Double_t chi2track = fitter->GetChisquare()/Double_t(nPoints);
1310
6e39bde4 1311 // Prepare error calculation
1312 TMatrixD covarPolY(3,3);
1313 covarPolY(0,0) = sumPolY[0]; covarPolY(1,1) = sumPolY[2]; covarPolY(2,2) = sumPolY[4];
1314 covarPolY(0,1) = covarPolY(1,0) = sumPolY[1];
1315 covarPolY(0,2) = covarPolY(2,0) = sumPolY[2];
1316 covarPolY(2,1) = covarPolY(1,2) = sumPolY[3];
1317 covarPolY.Invert();
1318 TMatrixD covarPolZ(2,2);
1319 covarPolZ(0,0) = sumPolZ[0]; covarPolZ(1,1) = sumPolZ[2];
1320 covarPolZ(1,0) = covarPolZ(0,1) = sumPolZ[1];
1321 covarPolZ.Invert();
1322
41702fec 1323 // Update the tracklets
6e39bde4 1324 Double_t x1, dy, dz;
1325 Double_t cov[15];
1326 memset(cov, 0, sizeof(Double_t) * 15);
41702fec 1327 for(Int_t iLayer = 0; iLayer < AliTRDtrackerV1::kNPlanes; iLayer++) {
1328
1329 x = tracklets[iLayer].GetX0();
6e39bde4 1330 x1 = x - xref;
41702fec 1331 y = 0;
1332 z = 0;
1333 dy = 0;
1334 dz = 0;
6e39bde4 1335 memset(cov, 0, sizeof(Double_t) * 3);
1336 TMatrixD transform(3,3);
1337 transform(0,0) = 1;
1338 transform(0,1) = x;
1339 transform(0,2) = x*x;
1340 transform(1,1) = 1;
1341 transform(1,2) = x;
1342 transform(2,2) = 1;
1343 TMatrixD covariance(transform, TMatrixD::kMult, covarPolY);
1344 covariance *= transform.T();
1345 TMatrixD transformZ(2,2);
1346 transformZ(0,0) = transformZ(1,1) = 1;
1347 transformZ(0,1) = x;
1348 TMatrixD covarZ(transformZ, TMatrixD::kMult, covarPolZ);
1349 covarZ *= transformZ.T();
41702fec 1350 // y: R^2 = (x - x0)^2 + (y - y0)^2
1351 // => y = y0 +/- Sqrt(R^2 - (x - x0)^2)
1352 // R = Sqrt() = 1/Curvature
1353 // => y = y0 +/- Sqrt(1/Curvature^2 - (x - x0)^2)
1354 Double_t res = (x * a + b); // = (x - x0)/y0
1355 res *= res;
1356 res = 1.0 - c * a + b * b - res; // = (R^2 - (x - x0)^2)/y0^2
1357 if (res >= 0) {
1358 res = TMath::Sqrt(res);
1359 y = (1.0 - res) / a;
1360 }
6e39bde4 1361 cov[0] = covariance(0,0);
1362 cov[2] = covarZ(0,0);
1363 cov[1] = 0.;
41702fec 1364
1365 // dy: R^2 = (x - x0)^2 + (y - y0)^2
1366 // => y = +/- Sqrt(R^2 - (x - x0)^2) + y0
1367 // => dy/dx = (x - x0)/Sqrt(R^2 - (x - x0)^2)
1368 // Curvature: cr = 1/R = a/Sqrt(1 + b^2 - c*a)
1369 // => dy/dx = (x - x0)/(1/(cr^2) - (x - x0)^2)
1370 Double_t x0 = -b / a;
1371 if (-c * a + b * b + 1 > 0) {
1372 if (1.0/(curvature * curvature) - (x - x0) * (x - x0) > 0.0) {
6e39bde4 1373 Double_t yderiv = (x - x0) / TMath::Sqrt(1.0/(curvature * curvature) - (x - x0) * (x - x0));
1374 if (a < 0) yderiv *= -1.0;
1375 dy = yderiv;
41702fec 1376 }
1377 }
1378 z = offset + slope * (x - xref);
1379 dz = slope;
1380 tracklets[iLayer].SetYref(0, y);
1381 tracklets[iLayer].SetYref(1, dy);
1382 tracklets[iLayer].SetZref(0, z);
1383 tracklets[iLayer].SetZref(1, dz);
1384 tracklets[iLayer].SetC(curvature);
6e39bde4 1385 tracklets[iLayer].SetCovRef(cov);
41702fec 1386 tracklets[iLayer].SetChi2(chi2track);
1387 }
68f9b6bd 1388 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 1389
a2fbb6ec 1390/* if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) >=5){
1391 TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
41702fec 1392 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
1393 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
1394 Double_t chi2z = CalculateChi2Z(tracklets, offset, slope, xref);
1395 cstreamer << "FitTiltedRieman0"
1396 << "EventNumber=" << eventNumber
1397 << "CandidateNumber=" << candidateNumber
1398 << "xref=" << xref
1399 << "Chi2Z=" << chi2z
1400 << "\n";
3a039a31 1401 }*/
41702fec 1402 return chi2track;
eb38ed55 1403}
1404
3b57a3f7 1405
9e333711 1406//____________________________________________________________________
6e4d4425 1407Double_t AliTRDtrackerV1::FitLine(const AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t err, Int_t np, AliTrackPoint *points)
9e333711 1408{
4d6aee34 1409 //
1410 // Fit track with a staight line
1411 // Fills an AliTrackPoint array with np points
1412 // Function should be used to refit tracks when no magnetic field was on
1413 //
9e333711 1414 AliTRDLeastSquare yfitter, zfitter;
4d6aee34 1415 AliTRDcluster *cl = NULL;
9e333711 1416
4d6aee34 1417 AliTRDseedV1 work[kNPlanes], *tracklet = NULL;
9e333711 1418 if(!tracklets){
1419 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1420 if(!(tracklet = track->GetTracklet(ipl))) continue;
1421 if(!tracklet->IsOK()) continue;
1422 new(&work[ipl]) AliTRDseedV1(*tracklet);
1423 }
1424 tracklets = &work[0];
1425 }
1426
1427 Double_t xref = CalculateReferenceX(tracklets);
1428 Double_t x, y, z, dx, ye, yr, tilt;
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 z = cl->GetZ();
1436 dx = x - xref;
1437 zfitter.AddPoint(&dx, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
1438 }
1439 }
1440 zfitter.Eval();
1441 Double_t z0 = zfitter.GetFunctionParameter(0);
1442 Double_t dzdx = zfitter.GetFunctionParameter(1);
1443 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1444 if(!tracklets[ipl].IsOK()) continue;
1445 for(Int_t itb = 0; itb < fgNTimeBins; itb++){
1446 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1447 if (!tracklets[ipl].IsUsable(itb)) continue;
1448 x = cl->GetX();
1449 y = cl->GetY();
1450 z = cl->GetZ();
1451 tilt = tracklets[ipl].GetTilt();
1452 dx = x - xref;
1453 yr = y + tilt*(z - z0 - dzdx*dx);
1454 // error definition changes for the different calls
1455 ye = tilt*TMath::Sqrt(cl->GetSigmaZ2());
1456 ye += err ? tracklets[ipl].GetSigmaY() : 0.2;
1457 yfitter.AddPoint(&dx, yr, ye);
1458 }
1459 }
1460 yfitter.Eval();
1461 Double_t y0 = yfitter.GetFunctionParameter(0);
1462 Double_t dydx = yfitter.GetFunctionParameter(1);
1463 Double_t chi2 = 0.;//yfitter.GetChisquare()/Double_t(nPoints);
1464
1465 //update track points array
1466 if(np && points){
1467 Float_t xyz[3];
1468 for(int ip=0; ip<np; ip++){
1469 points[ip].GetXYZ(xyz);
1470 xyz[1] = y0 + dydx * (xyz[0] - xref);
1471 xyz[2] = z0 + dzdx * (xyz[0] - xref);
1472 points[ip].SetXYZ(xyz);
1473 }
1474 }
1475 return chi2;
1476}
1477
1478
3b57a3f7 1479//_________________________________________________________________________
6e4d4425 1480Double_t AliTRDtrackerV1::FitRiemanTilt(const AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t sigError, Int_t np, AliTrackPoint *points)
3b57a3f7 1481{
0fa1a8ee 1482//
1483// Performs a Riemann fit taking tilting pad correction into account
1484//
1485// Paramters: - Array of tracklets (connected to the track candidate)
1486// - Flag selecting the error definition
1487// Output: - Chi2 values of the track (in Parameter list)
1488//
1489// The equations which has to be solved simultaneously are:
1490// BEGIN_LATEX
1491// R^{2} = (x-x_{0})^{2} + (y^{*}-y_{0})^{2}
1492// y^{*} = y - tg(h)(z - z_{t})
1493// z_{t} = z_{0}+dzdx*(x-x_{r})
1494// END_LATEX
1495// with (x, y, z) the coordinate of the cluster, (x_0, y_0, z_0) the coordinate of the center of the Riemann circle,
1496// R its radius, x_r a constant refrence radial position in the middle of the TRD stack and dzdx the slope of the
1497// track in the x-z plane. Using the following transformations
1498// BEGIN_LATEX
1499// t = 1 / (x^{2} + y^{2})
1500// u = 2 * x * t
1501// v = 2 * tan(h) * t
1502// w = 2 * tan(h) * (x - x_{r}) * t
1503// END_LATEX
1504// One gets the following linear equation
1505// BEGIN_LATEX
1506// a + b * u + c * t + d * v + e * w = 2 * (y + tg(h) * z) * t
1507// END_LATEX
1508// where the coefficients have the following meaning
1509// BEGIN_LATEX
1510// a = -1/y_{0}
1511// b = x_{0}/y_{0}
1512// c = (R^{2} -x_{0}^{2} - y_{0}^{2})/y_{0}
1513// d = z_{0}
1514// e = dz/dx
1515// END_LATEX
1516// The error calculation for the free term is thus
1517// BEGIN_LATEX
1518// #sigma = 2 * #sqrt{#sigma^{2}_{y} + (tilt corr ...) + tg^{2}(h) * #sigma^{2}_{z}} * t
1519// END_LATEX
1520//
1521// From this simple model one can compute chi^2 estimates and a rough approximation of pt from the curvature according
1522// to the formula:
1523// BEGIN_LATEX
1524// C = 1/R = a/(1 + b^{2} + c*a)
1525// END_LATEX
1526//
1527// Authors
1528// M.Ivanov <M.Ivanov@gsi.de>
1529// A.Bercuci <A.Bercuci@gsi.de>
1530// M.Fasel <M.Fasel@gsi.de>
1531
41702fec 1532 TLinearFitter *fitter = GetTiltedRiemanFitter();
1533 fitter->StoreData(kTRUE);
1534 fitter->ClearPoints();
1535 AliTRDLeastSquare zfitter;
4d6aee34 1536 AliTRDcluster *cl = NULL;
3b57a3f7 1537
4d6aee34 1538 AliTRDseedV1 work[kNPlanes], *tracklet = NULL;
3b57a3f7 1539 if(!tracklets){
1540 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1541 if(!(tracklet = track->GetTracklet(ipl))) continue;
1542 if(!tracklet->IsOK()) continue;
1543 new(&work[ipl]) AliTRDseedV1(*tracklet);
1544 }
1545 tracklets = &work[0];
1546 }
1547
41702fec 1548 Double_t xref = CalculateReferenceX(tracklets);
68f9b6bd 1549 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 1550 Double_t x, y, z, t, tilt, dx, w, we;
1551 Double_t uvt[4];
1552 Int_t nPoints = 0;
1553 // Containers for Least-square fitter
1554 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1555 if(!tracklets[ipl].IsOK()) continue;
8d2bec9e 1556 for(Int_t itb = 0; itb < AliTRDseedV1::kNclusters; itb++){
41702fec 1557 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
352cef8f 1558 //if (!tracklets[ipl].IsUsable(itb)) continue;
41702fec 1559 x = cl->GetX();
1560 y = cl->GetY();
1561 z = cl->GetZ();
1562 tilt = tracklets[ipl].GetTilt();
1563 dx = x - xref;
1564 // Transformation
1565 t = 1./(x*x + y*y);
1566 uvt[0] = 2. * x * t;
1567 uvt[1] = t;
1568 uvt[2] = 2. * tilt * t;
1569 uvt[3] = 2. * tilt * dx * t;
1570 w = 2. * (y + tilt*z) * t;
1571 // error definition changes for the different calls
1572 we = 2. * t;
f29f13a6 1573 we *= sigError ? TMath::Sqrt(cl->GetSigmaY2()) : 0.2;
41702fec 1574 fitter->AddPoint(uvt, w, we);
1575 zfitter.AddPoint(&x, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
1576 nPoints++;
1577 }
1578 }
aec26713 1579 if(fitter->Eval()) return 1.E10;
1580
41702fec 1581 Double_t z0 = fitter->GetParameter(3);
1582 Double_t dzdx = fitter->GetParameter(4);
3b57a3f7 1583
1584
1585 // Linear fitter - not possible to make boundaries
1586 // Do not accept non possible z and dzdx combinations
1587 Bool_t accept = kTRUE;
1588 Double_t zref = 0.0;
1589 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
1590 if(!tracklets[iLayer].IsOK()) continue;
1591 zref = z0 + dzdx * (tracklets[iLayer].GetX0() - xref);
e3cf3d02 1592 if (TMath::Abs(tracklets[iLayer].GetZfit(0) - zref) > tracklets[iLayer].GetPadLength() * 0.5 + 1.0)
3b57a3f7 1593 accept = kFALSE;
1594 }
1595 if (!accept) {
41702fec 1596 zfitter.Eval();
3b57a3f7 1597 Double_t dzmf = zfitter.GetFunctionParameter(1);
1598 Double_t zmf = zfitter.GetFunctionValue(&xref);
1599 fitter->FixParameter(3, zmf);
1600 fitter->FixParameter(4, dzmf);
e17f4785 1601 fitter->Eval();
3b57a3f7 1602 fitter->ReleaseParameter(3);
1603 fitter->ReleaseParameter(4);
1604 z0 = fitter->GetParameter(3); // = zmf ?
1605 dzdx = fitter->GetParameter(4); // = dzmf ?
1606 }
1607
1608 // Calculate Curvature
1609 Double_t a = fitter->GetParameter(0);
1610 Double_t b = fitter->GetParameter(1);
1611 Double_t c = fitter->GetParameter(2);
1612 Double_t y0 = 1. / a;
1613 Double_t x0 = -b * y0;
a015e406 1614 Double_t tmp = y0*y0 + x0*x0 - c*y0;
1615 if(tmp<=0.) return 1.E10;
4d6aee34 1616 Double_t radius = TMath::Sqrt(tmp);
1617 Double_t curvature = 1.0 + b*b - c*a;
1618 if (curvature > 0.0) curvature = a / TMath::Sqrt(curvature);
3b57a3f7 1619
1620 // Calculate chi2 of the fit
1621 Double_t chi2 = fitter->GetChisquare()/Double_t(nPoints);
68f9b6bd 1622 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 1623
1624 // Update the tracklets
1625 if(!track){
1626 for(Int_t ip = 0; ip < kNPlanes; ip++) {
1627 x = tracklets[ip].GetX0();
4d6aee34 1628 tmp = radius*radius-(x-x0)*(x-x0);
a015e406 1629 if(tmp <= 0.) continue;
1630 tmp = TMath::Sqrt(tmp);
3b57a3f7 1631
1632 // y: R^2 = (x - x0)^2 + (y - y0)^2
1633 // => y = y0 +/- Sqrt(R^2 - (x - x0)^2)
1634 tracklets[ip].SetYref(0, y0 - (y0>0.?1.:-1)*tmp);
1635 // => dy/dx = (x - x0)/Sqrt(R^2 - (x - x0)^2)
1636 tracklets[ip].SetYref(1, (x - x0) / tmp);
1637 tracklets[ip].SetZref(0, z0 + dzdx * (x - xref));
1638 tracklets[ip].SetZref(1, dzdx);
4d6aee34 1639 tracklets[ip].SetC(curvature);
3b57a3f7 1640 tracklets[ip].SetChi2(chi2);
1641 }
1642 }
3b57a3f7 1643 //update track points array
1644 if(np && points){
1645 Float_t xyz[3];
1646 for(int ip=0; ip<np; ip++){
1647 points[ip].GetXYZ(xyz);
4d6aee34 1648 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 1649 xyz[2] = z0 + dzdx * (xyz[0] - xref);
1650 points[ip].SetXYZ(xyz);
1651 }
1652 }
1653
3b57a3f7 1654 return chi2;
1655}
1656
1657
1bf51039 1658//____________________________________________________________________
e17f4785 1659Double_t AliTRDtrackerV1::FitKalman(AliTRDtrackV1 *track, AliTRDseedV1 * const tracklets, Bool_t up, Int_t np, AliTrackPoint *points)
1bf51039 1660{
1661// Kalman filter implementation for the TRD.
1662// It returns the positions of the fit in the array "points"
1663//
1664// Author : A.Bercuci@gsi.de
1665
3cfaffa4 1666 // printf("Start track @ x[%f]\n", track->GetX());
1bf51039 1667
1668 //prepare marker points along the track
1669 Int_t ip = np ? 0 : 1;
1670 while(ip<np){
1671 if((up?-1:1) * (track->GetX() - points[ip].GetX()) > 0.) break;
1672 //printf("AliTRDtrackerV1::FitKalman() : Skip track marker x[%d] = %7.3f. Before track start ( %7.3f ).\n", ip, points[ip].GetX(), track->GetX());
1673 ip++;
1674 }
1675 //if(points) printf("First marker point @ x[%d] = %f\n", ip, points[ip].GetX());
1676
1677
4d6aee34 1678 AliTRDseedV1 tracklet, *ptrTracklet = NULL;
1bf51039 1679
1680 //Loop through the TRD planes
1681 for (Int_t jplane = 0; jplane < kNPlanes; jplane++) {
1682 // GET TRACKLET OR BUILT IT
1683 Int_t iplane = up ? jplane : kNPlanes - 1 - jplane;
1684 if(tracklets){
e17f4785 1685 if(!(ptrTracklet = &tracklets[iplane])) continue;
1bf51039 1686 }else{
1687 if(!(ptrTracklet = track->GetTracklet(iplane))){
4d6aee34 1688 /*AliTRDtrackerV1 *tracker = NULL;
a2fbb6ec 1689 if(!(tracker = dynamic_cast<AliTRDtrackerV1*>( AliTRDrecoParam:Tracker()))) continue;
1bf51039 1690 ptrTracklet = new(&tracklet) AliTRDseedV1(iplane);
1691 if(!tracker->MakeTracklet(ptrTracklet, track)) */
1692 continue;
1693 }
1694 }
1695 if(!ptrTracklet->IsOK()) continue;
1696
1697 Double_t x = ptrTracklet->GetX0();
1698
1699 while(ip < np){
1700 //don't do anything if next marker is after next update point.
1701 if((up?-1:1) * (points[ip].GetX() - x) - fgkMaxStep < 0) break;
1bf51039 1702 if(((up?-1:1) * (points[ip].GetX() - track->GetX()) < 0) && !PropagateToX(*track, points[ip].GetX(), fgkMaxStep)) return -1.;
1703
1704 Double_t xyz[3]; // should also get the covariance
3cfaffa4 1705 track->GetXYZ(xyz);
1706 track->Global2LocalPosition(xyz, track->GetAlpha());
1707 points[ip].SetXYZ(xyz[0], xyz[1], xyz[2]);
1bf51039 1708 ip++;
1709 }
3cfaffa4 1710 // printf("plane[%d] tracklet[%p] x[%f]\n", iplane, ptrTracklet, x);
1bf51039 1711
3cfaffa4 1712 // Propagate closer to the next update point
1bf51039 1713 if(((up?-1:1) * (x - track->GetX()) + fgkMaxStep < 0) && !PropagateToX(*track, x + (up?-1:1)*fgkMaxStep, fgkMaxStep)) return -1.;
1714
1715 if(!AdjustSector(track)) return -1;
1716 if(TMath::Abs(track->GetSnp()) > fgkMaxSnp) return -1;
1717
1718 //load tracklet to the tracker and the track
1719/* Int_t index;
1720 if((index = FindTracklet(ptrTracklet)) < 0){
1721 ptrTracklet = SetTracklet(&tracklet);
1722 index = fTracklets->GetEntriesFast()-1;
1723 }
1724 track->SetTracklet(ptrTracklet, index);*/
1725
1726
1727 // register tracklet to track with tracklet creation !!
1728 // PropagateBack : loaded tracklet to the tracker and update index
1729 // RefitInward : update index
1730 // MakeTrack : loaded tracklet to the tracker and update index
1731 if(!tracklets) track->SetTracklet(ptrTracklet, -1);
1732
1733
1734 //Calculate the mean material budget along the path inside the chamber
1735 Double_t xyz0[3]; track->GetXYZ(xyz0);
1736 Double_t alpha = track->GetAlpha();
1737 Double_t xyz1[3], y, z;
1738 if(!track->GetProlongation(x, y, z)) return -1;
1739 xyz1[0] = x * TMath::Cos(alpha) - y * TMath::Sin(alpha);
1740 xyz1[1] = +x * TMath::Sin(alpha) + y * TMath::Cos(alpha);
1741 xyz1[2] = z;
fbe11be7 1742 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 1743 Double_t param[7];
3cfaffa4 1744 if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param) <=0.) break;
1bf51039 1745 Double_t xrho = param[0]*param[4]; // density*length
1746 Double_t xx0 = param[1]; // radiation length
1747
1748 //Propagate the track
1749 track->PropagateTo(x, xx0, xrho);
1750 if (!AdjustSector(track)) break;
1751
1752 //Update track
b72f4eaf 1753 Double_t cov[3]; ptrTracklet->GetCovAt(x, cov);
1754 Double_t p[2] = { ptrTracklet->GetY(), ptrTracklet->GetZ()};
1755 Double_t chi2 = ((AliExternalTrackParam*)track)->GetPredictedChi2(p, cov);
ef867f55 1756 if(chi2<1e+10) ((AliExternalTrackParam*)track)->Update(p, cov);
1bf51039 1757 if(!up) continue;
1758
1759 //Reset material budget if 2 consecutive gold
1760 if(iplane>0 && track->GetTracklet(iplane-1) && ptrTracklet->GetN() + track->GetTracklet(iplane-1)->GetN() > 20) track->SetBudget(2, 0.);
1761 } // end planes loop
1762
1763 // extrapolation
1764 while(ip < np){
1765 if(((up?-1:1) * (points[ip].GetX() - track->GetX()) < 0) && !PropagateToX(*track, points[ip].GetX(), fgkMaxStep)) return -1.;
1766
1767 Double_t xyz[3]; // should also get the covariance
3cfaffa4 1768 track->GetXYZ(xyz);
1769 track->Global2LocalPosition(xyz, track->GetAlpha());
1770 points[ip].SetXYZ(xyz[0], xyz[1], xyz[2]);
1bf51039 1771 ip++;
1772 }
1773
1774 return track->GetChi2();
1775}
3b57a3f7 1776
eb38ed55 1777//_________________________________________________________________________
bb56afff 1778Float_t AliTRDtrackerV1::CalculateChi2Z(AliTRDseedV1 *tracklets, Double_t offset, Double_t slope, Double_t xref)
eb38ed55 1779{
41702fec 1780 //
1781 // Calculates the chi2-value of the track in z-Direction including tilting pad correction.
1782 // A linear dependence on the x-value serves as a model.
1783 // The parameters are related to the tilted Riemann fit.
1784 // Parameters: - Array of tracklets (AliTRDseedV1) related to the track candidate
1785 // - the offset for the reference x
1786 // - the slope
1787 // - the reference x position
1788 // Output: - The Chi2 value of the track in z-Direction
1789 //
1790 Float_t chi2Z = 0, nLayers = 0;
053767a4 1791 for (Int_t iLayer = 0; iLayer < AliTRDgeometry::kNlayer; iLayer++) {
41702fec 1792 if(!tracklets[iLayer].IsOK()) continue;
1793 Double_t z = offset + slope * (tracklets[iLayer].GetX0() - xref);
e3cf3d02 1794 chi2Z += TMath::Abs(tracklets[iLayer].GetZfit(0) - z);
41702fec 1795 nLayers++;
1796 }
1797 chi2Z /= TMath::Max((nLayers - 3.0),1.0);
1798 return chi2Z;
eb38ed55 1799}
1800
bccda319 1801//_____________________________________________________________________________
1802Int_t AliTRDtrackerV1::PropagateToX(AliTRDtrackV1 &t, Double_t xToGo, Double_t maxStep)
1803{
41702fec 1804 //
1805 // Starting from current X-position of track <t> this function
1806 // extrapolates the track up to radial position <xToGo>.
1807 // Returns 1 if track reaches the plane, and 0 otherwise
1808 //
bccda319 1809
41702fec 1810 const Double_t kEpsilon = 0.00001;
bccda319 1811
41702fec 1812 // Current track X-position
1813 Double_t xpos = t.GetX();
bccda319 1814
41702fec 1815 // Direction: inward or outward
1816 Double_t dir = (xpos < xToGo) ? 1.0 : -1.0;
bccda319 1817
41702fec 1818 while (((xToGo - xpos) * dir) > kEpsilon) {
bccda319 1819
41702fec 1820 Double_t xyz0[3];
1821 Double_t xyz1[3];
1822 Double_t param[7];
1823 Double_t x;
1824 Double_t y;
1825 Double_t z;
bccda319 1826
41702fec 1827 // The next step size
1828 Double_t step = dir * TMath::Min(TMath::Abs(xToGo-xpos),maxStep);
bccda319 1829
41702fec 1830 // Get the global position of the starting point
1831 t.GetXYZ(xyz0);
bccda319 1832
41702fec 1833 // X-position after next step
1834 x = xpos + step;
bccda319 1835
41702fec 1836 // Get local Y and Z at the X-position of the next step
3352b455 1837 if(t.GetProlongation(x,y,z)<0) return 0; // No prolongation possible
bccda319 1838
41702fec 1839 // The global position of the end point of this prolongation step
1840 xyz1[0] = x * TMath::Cos(t.GetAlpha()) - y * TMath::Sin(t.GetAlpha());
1841 xyz1[1] = +x * TMath::Sin(t.GetAlpha()) + y * TMath::Cos(t.GetAlpha());
1842 xyz1[2] = z;
bccda319 1843
41702fec 1844 // Calculate the mean material budget between start and
1845 // end point of this prolongation step
83dea92e 1846 if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param)<=0.) return 0;
bccda319 1847
41702fec 1848 // Propagate the track to the X-position after the next step
9c87a076 1849 if (!t.PropagateTo(x, param[1], param[0]*param[4])) return 0;
bccda319 1850
41702fec 1851 // Rotate the track if necessary
1852 AdjustSector(&t);
bccda319 1853
41702fec 1854 // New track X-position
1855 xpos = t.GetX();
bccda319 1856
41702fec 1857 }
bccda319 1858
41702fec 1859 return 1;
bccda319 1860
1861}
1862
eb38ed55 1863
1864//_____________________________________________________________________________
1865Int_t AliTRDtrackerV1::ReadClusters(TClonesArray* &array, TTree *clusterTree) const
1866{
41702fec 1867 //
1868 // Reads AliTRDclusters from the file.
1869 // The names of the cluster tree and branches
1870 // should match the ones used in AliTRDclusterizer::WriteClusters()
1871 //
1872
1873 Int_t nsize = Int_t(clusterTree->GetTotBytes() / (sizeof(AliTRDcluster)));
1874 TObjArray *clusterArray = new TObjArray(nsize+1000);
1875
1876 TBranch *branch = clusterTree->GetBranch("TRDcluster");
1877 if (!branch) {
1878 AliError("Can't get the branch !");
1879 return 1;
1880 }
1881 branch->SetAddress(&clusterArray);
1882
1883 if(!fClusters){
9e85cb05 1884 Float_t nclusters = fkRecoParam->GetNClusters();
4d6aee34 1885 if(fkReconstructor->IsHLT()) nclusters /= AliTRDgeometry::kNsector;
8ae98148 1886 array = new TClonesArray("AliTRDcluster", Int_t(nclusters));
41702fec 1887 array->SetOwner(kTRUE);
1888 }
1889
1890 // Loop through all entries in the tree
1891 Int_t nEntries = (Int_t) clusterTree->GetEntries();
1892 Int_t nbytes = 0;
1893 Int_t ncl = 0;
4d6aee34 1894 AliTRDcluster *c = NULL;
41702fec 1895 for (Int_t iEntry = 0; iEntry < nEntries; iEntry++) {
1896 // Import the tree
1897 nbytes += clusterTree->GetEvent(iEntry);
1898
1899 // Get the number of points in the detector
1900 Int_t nCluster = clusterArray->GetEntriesFast();
1901 for (Int_t iCluster = 0; iCluster < nCluster; iCluster++) {
1902 if(!(c = (AliTRDcluster *) clusterArray->UncheckedAt(iCluster))) continue;
41702fec 1903 new((*fClusters)[ncl++]) AliTRDcluster(*c);
1904 delete (clusterArray->RemoveAt(iCluster));
1905 }
1906
1907 }
1908 delete clusterArray;
1909
1910 return 0;
eb38ed55 1911}
1912
1913//_____________________________________________________________________________
1914Int_t AliTRDtrackerV1::LoadClusters(TTree *cTree)
1915{
41702fec 1916 //
66f6bfd9 1917 // Fills clusters into TRD tracking sectors
41702fec 1918 //
41702fec 1919
9e85cb05 1920 fkRecoParam = fkReconstructor->GetRecoParam(); // load reco param for this event
1921
4d6aee34 1922 if(!fkReconstructor->IsWritingClusters()){
48f8adf3 1923 fClusters = AliTRDReconstructor::GetClusters();
1924 } else {
66f6bfd9 1925 if (ReadClusters(fClusters, cTree)) {
1926 AliError("Problem with reading the clusters !");
1927 return 1;
1928 }
1929 }
1930 SetClustersOwner();
1931
48f8adf3 1932 if(!fClusters || !fClusters->GetEntriesFast()){
66f6bfd9 1933 AliInfo("No TRD clusters");
41702fec 1934 return 1;
1935 }
66f6bfd9 1936
1937 //Int_t nin =
1938 BuildTrackingContainers();
1939
1940 //Int_t ncl = fClusters->GetEntriesFast();
1941 //AliInfo(Form("Clusters %d [%6.2f %% in the active volume]", ncl, 100.*float(nin)/ncl));
1942
1943 return 0;
1944}
1945
1946//_____________________________________________________________________________
4d6aee34 1947Int_t AliTRDtrackerV1::LoadClusters(TClonesArray * const clusters)
66f6bfd9 1948{
1949 //
1950 // Fills clusters into TRD tracking sectors
1951 // Function for use in the HLT
1952
1953 if(!clusters || !clusters->GetEntriesFast()){
1954 AliInfo("No TRD clusters");
41702fec 1955 return 1;
1956 }
1957
66f6bfd9 1958 fClusters = clusters;
1959 SetClustersOwner();
1960
9e85cb05 1961 fkRecoParam = fkReconstructor->GetRecoParam(); // load reco param for this event
66f6bfd9 1962 BuildTrackingContainers();
1963
1964 //Int_t ncl = fClusters->GetEntriesFast();
1965 //AliInfo(Form("Clusters %d [%6.2f %% in the active volume]", ncl, 100.*float(nin)/ncl));
1966
1967 return 0;
1968}
1969
1970
1971//____________________________________________________________________
1972Int_t AliTRDtrackerV1::BuildTrackingContainers()
1973{
1974// Building tracking containers for clusters
1975
c79857d5 1976 Int_t nin(0), ncl(fClusters->GetEntriesFast());
1977 while (ncl--) {
1978 AliTRDcluster *c = (AliTRDcluster *) fClusters->UncheckedAt(ncl);
41702fec 1979 if(c->IsInChamber()) nin++;
4226b195 1980 if(fkReconstructor->IsHLT()) c->SetRPhiMethod(AliTRDcluster::kCOG);
41702fec 1981 Int_t detector = c->GetDetector();
1982 Int_t sector = fGeom->GetSector(detector);
053767a4 1983 Int_t stack = fGeom->GetStack(detector);
1984 Int_t layer = fGeom->GetLayer(detector);
41702fec 1985
0b559d95 1986 fTrSec[sector].GetChamber(stack, layer, kTRUE)->InsertCluster(c, ncl);
41702fec 1987 }
b0a48c4d 1988
053767a4 1989 for(int isector =0; isector<AliTRDgeometry::kNsector; isector++){
41702fec 1990 if(!fTrSec[isector].GetNChambers()) continue;
c79857d5 1991 fTrSec[isector].Init(fkReconstructor);
41702fec 1992 }
66f6bfd9 1993
1994 return nin;
eb38ed55 1995}
1996
1997
66f6bfd9 1998
0906e73e 1999//____________________________________________________________________
172b6f82 2000void AliTRDtrackerV1::UnloadClusters()
0906e73e 2001{
d4cf71ca 2002//
2003// Clears the arrays of clusters and tracks. Resets sectors and timebins
2004// If option "force" is also set the containers are also deleted. This is useful
2005// in case of HLT
2006
2007 if(fTracks){
2008 fTracks->Delete();
4d6aee34 2009 if(HasRemoveContainers()){delete fTracks; fTracks = NULL;}
d4cf71ca 2010 }
2011 if(fTracklets){
2012 fTracklets->Delete();
4d6aee34 2013 if(HasRemoveContainers()){delete fTracklets; fTracklets = NULL;}
d4cf71ca 2014 }
48f8adf3 2015 if(fClusters){
2016 if(IsClustersOwner()) fClusters->Delete();
2017
2018 // save clusters array in the reconstructor for further use.
4d6aee34 2019 if(!fkReconstructor->IsWritingClusters()){
48f8adf3 2020 AliTRDReconstructor::SetClusters(fClusters);
2021 SetClustersOwner(kFALSE);
4d6aee34 2022 } else AliTRDReconstructor::SetClusters(NULL);
48f8adf3 2023 }
0906e73e 2024
053767a4 2025 for (int i = 0; i < AliTRDgeometry::kNsector; i++) fTrSec[i].Clear();
0906e73e 2026
41702fec 2027 // Increment the Event Number
2028 AliTRDtrackerDebug::SetEventNumber(AliTRDtrackerDebug::GetEventNumber() + 1);
eb38ed55 2029}
0906e73e 2030
fac58f00 2031// //____________________________________________________________________
2032// void AliTRDtrackerV1::UseClusters(const AliKalmanTrack *t, Int_t) const
2033// {
2034// const AliTRDtrackV1 *track = dynamic_cast<const AliTRDtrackV1*>(t);
2035// if(!track) return;
2036//
4d6aee34 2037// AliTRDseedV1 *tracklet = NULL;
fac58f00 2038// for(Int_t ily=AliTRDgeometry::kNlayer; ily--;){
2039// if(!(tracklet = track->GetTracklet(ily))) continue;
4d6aee34 2040// AliTRDcluster *c = NULL;
8d2bec9e 2041// for(Int_t ic=AliTRDseed::kNclusters; ic--;){
fac58f00 2042// if(!(c=tracklet->GetClusters(ic))) continue;
2043// c->Use();
2044// }
2045// }
2046// }
2047//
b1957d3c 2048
eb38ed55 2049//_____________________________________________________________________________
4d6aee34 2050Bool_t AliTRDtrackerV1::AdjustSector(AliTRDtrackV1 *const track)
eb38ed55 2051{
41702fec 2052 //
2053 // Rotates the track when necessary
2054 //
2055
2056 Double_t alpha = AliTRDgeometry::GetAlpha();
2057 Double_t y = track->GetY();
2058 Double_t ymax = track->GetX()*TMath::Tan(0.5*alpha);
3cfaffa4 2059
41702fec 2060 if (y > ymax) {
2061 if (!track->Rotate( alpha)) {
2062 return kFALSE;
2063 }
2064 }
2065 else if (y < -ymax) {
2066 if (!track->Rotate(-alpha)) {
2067 return kFALSE;
2068 }
2069 }
2070
2071 return kTRUE;
0906e73e 2072
2073}
2074
eb38ed55 2075
0906e73e 2076//____________________________________________________________________
4d6aee34 2077AliTRDseedV1* AliTRDtrackerV1::GetTracklet(AliTRDtrackV1 *const track, Int_t p, Int_t &idx)
0906e73e 2078{
41702fec 2079 // Find tracklet for TRD track <track>
2080 // Parameters
2081 // - track
2082 // - sector
2083 // - plane
2084 // - index
2085 // Output
2086 // tracklet
2087 // index
2088 // Detailed description
2089 //
2090 idx = track->GetTrackletIndex(p);
17896e82 2091 AliTRDseedV1 *tracklet = (idx<0) ? NULL : (AliTRDseedV1*)fTracklets->UncheckedAt(idx);
41702fec 2092
2093 return tracklet;
0906e73e 2094}
2095
2096//____________________________________________________________________
4d6aee34 2097AliTRDseedV1* AliTRDtrackerV1::SetTracklet(const AliTRDseedV1 * const tracklet)
0906e73e 2098{
41702fec 2099 // Add this tracklet to the list of tracklets stored in the tracker
2100 //
2101 // Parameters
2102 // - tracklet : pointer to the tracklet to be added to the list
2103 //
2104 // Output
2105 // - the index of the new tracklet in the tracker tracklets list
2106 //
2107 // Detailed description
2108 // Build the tracklets list if it is not yet created (late initialization)
2109 // and adds the new tracklet to the list.
2110 //
2111 if(!fTracklets){
053767a4 2112 fTracklets = new TClonesArray("AliTRDseedV1", AliTRDgeometry::Nsector()*kMaxTracksStack);
41702fec 2113 fTracklets->SetOwner(kTRUE);
2114 }
2115 Int_t nentries = fTracklets->GetEntriesFast();
2116 return new ((*fTracklets)[nentries]) AliTRDseedV1(*tracklet);
972ef65e 2117}
2118
d20df6fc 2119//____________________________________________________________________
4d6aee34 2120AliTRDtrackV1* AliTRDtrackerV1::SetTrack(const AliTRDtrackV1 * const track)
d20df6fc 2121{
2122 // Add this track to the list of tracks stored in the tracker
2123 //
2124 // Parameters
2125 // - track : pointer to the track to be added to the list
2126 //
2127 // Output
2128 // - the pointer added
2129 //
2130 // Detailed description
2131 // Build the tracks list if it is not yet created (late initialization)
2132 // and adds the new track to the list.
2133 //
2134 if(!fTracks){
053767a4 2135 fTracks = new TClonesArray("AliTRDtrackV1", AliTRDgeometry::Nsector()*kMaxTracksStack);
d20df6fc 2136 fTracks->SetOwner(kTRUE);
2137 }
2138 Int_t nentries = fTracks->GetEntriesFast();
2139 return new ((*fTracks)[nentries]) AliTRDtrackV1(*track);
2140}
2141
2142
0906e73e 2143
e4f2f73d 2144//____________________________________________________________________
eb38ed55 2145Int_t AliTRDtrackerV1::Clusters2TracksSM(Int_t sector, AliESDEvent *esd)
e4f2f73d 2146{
41702fec 2147 //
2148 // Steer tracking for one SM.
2149 //
2150 // Parameters :
2151 // sector : Array of (SM) propagation layers containing clusters
2152 // esd : The current ESD event. On output it contains the also
2153 // the ESD (TRD) tracks found in this SM.
2154 //
2155 // Output :
2156 // Number of tracks found in this TRD supermodule.
2157 //
2158 // Detailed description
2159 //
2160 // 1. Unpack AliTRDpropagationLayers objects for each stack.
2161 // 2. Launch stack tracking.
2162 // See AliTRDtrackerV1::Clusters2TracksStack() for details.
2163 // 3. Pack results in the ESD event.
2164 //
2165
41702fec 2166 Int_t nTracks = 0;
2167 Int_t nChambers = 0;
4d6aee34 2168 AliTRDtrackingChamber **stack = NULL, *chamber = NULL;
053767a4 2169 for(int istack = 0; istack<AliTRDgeometry::kNstack; istack++){
41702fec 2170 if(!(stack = fTrSec[sector].GetStack(istack))) continue;
2171 nChambers = 0;
053767a4 2172 for(int ilayer=0; ilayer<AliTRDgeometry::kNlayer; ilayer++){
2173 if(!(chamber = stack[ilayer])) continue;
9e85cb05 2174 if(chamber->GetNClusters() < fgNTimeBins * fkRecoParam->GetFindableClusters()) continue;
41702fec 2175 nChambers++;
053767a4 2176 //AliInfo(Form("sector %d stack %d layer %d clusters %d", sector, istack, ilayer, chamber->GetNClusters()));
41702fec 2177 }
2178 if(nChambers < 4) continue;
2179 //AliInfo(Form("Doing stack %d", istack));
b1135f96 2180 nTracks += Clusters2TracksStack(stack, fTracksESD);
41702fec 2181 }
050875b0 2182 if(nTracks) AliDebug(2, Form("Number of tracks: SM_%02d[%d]", sector, nTracks));
2183
352cef8f 2184 for(int itrack=0; itrack<nTracks; itrack++){
2185 AliESDtrack *esdTrack((AliESDtrack*)(fTracksESD->operator[](itrack)));
2186 Int_t id = esd->AddTrack(esdTrack);
2187
2188 // set ESD id to stand alone TRD tracks
9e85cb05 2189 if (fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 0){
352cef8f 2190 esdTrack=esd->GetTrack(id);
2191 TObject *o(NULL); Int_t ic(0);
2192 AliTRDtrackV1 *calibTrack(NULL);
2193 while((o = esdTrack->GetCalibObject(ic++))){
2194 if(!(calibTrack = dynamic_cast<AliTRDtrackV1*>(o))) continue;
2195 calibTrack->SetESDid(esdTrack->GetID());
2196 break;
2197 }
2198 }
2199 }
41702fec 2200
2201 // Reset Track and Candidate Number
2202 AliTRDtrackerDebug::SetCandidateNumber(0);
2203 AliTRDtrackerDebug::SetTrackNumber(0);
b1135f96 2204
2205 // delete ESD tracks in the array
2206 fTracksESD->Delete();
41702fec 2207 return nTracks;
e4f2f73d 2208}
2209
2210//____________________________________________________________________
4d6aee34 2211Int_t AliTRDtrackerV1::Clusters2TracksStack(AliTRDtrackingChamber **stack, TClonesArray * const esdTrackList)
e4f2f73d 2212{
41702fec 2213 //
2214 // Make tracks in one TRD stack.
2215 //
2216 // Parameters :
2217 // layer : Array of stack propagation layers containing clusters
2218 // esdTrackList : Array of ESD tracks found by the stand alone tracker.
2219 // On exit the tracks found in this stack are appended.
2220 //
2221 // Output :
2222 // Number of tracks found in this stack.
2223 //
2224 // Detailed description
2225 //
2226 // 1. Find the 3 most useful seeding chambers. See BuildSeedingConfigs() for details.
2227 // 2. Steer AliTRDtrackerV1::MakeSeeds() for 3 seeding layer configurations.
2228 // See AliTRDtrackerV1::MakeSeeds() for more details.
2229 // 3. Arrange track candidates in decreasing order of their quality
2230 // 4. Classify tracks in 5 categories according to:
2231 // a) number of layers crossed
2232 // b) track quality
2233 // 5. Sign clusters by tracks in decreasing order of track quality
2234 // 6. Build AliTRDtrack out of seeding tracklets
2235 // 7. Cook MC label
2236 // 8. Build ESD track and register it to the output list
2237 //
2238
4d6aee34 2239 AliTRDtrackingChamber *chamber = NULL;
2240 AliTRDtrackingChamber **ci = NULL;
41702fec 2241 AliTRDseedV1 sseed[kMaxTracksStack*6]; // to be initialized
2242 Int_t pars[4]; // MakeSeeds parameters
2243
2244 //Double_t alpha = AliTRDgeometry::GetAlpha();
2245 //Double_t shift = .5 * alpha;
2246 Int_t configs[kNConfigs];
2247
fac58f00 2248 // Purge used clusters from the containers
2249 ci = &stack[0];
2250 for(Int_t ic = kNPlanes; ic--; ci++){
2251 if(!(*ci)) continue;
2252 (*ci)->Update();
2253 }
2254
41702fec 2255 // Build initial seeding configurations
2256 Double_t quality = BuildSeedingConfigs(stack, configs);
9e85cb05 2257 if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 10){
41702fec 2258 AliInfo(Form("Plane config %d %d %d Quality %f"
2259 , configs[0], configs[1], configs[2], quality));
2260 }
d931f2aa 2261
41702fec 2262
2263 // Initialize contors
2264 Int_t ntracks, // number of TRD track candidates
2265 ntracks1, // number of registered TRD tracks/iter
2266 ntracks2 = 0; // number of all registered TRD tracks in stack
2267 fSieveSeeding = 0;
d931f2aa 2268
2269 // Get stack index
fac58f00 2270 Int_t ic = 0; ci = &stack[0];
2271 while(ic<kNPlanes && !(*ci)){ic++; ci++;}
2272 if(!(*ci)) return ntracks2;
2273 Int_t istack = fGeom->GetStack((*ci)->GetDetector());
d931f2aa 2274
41702fec 2275 do{
2276 // Loop over seeding configurations
2277 ntracks = 0; ntracks1 = 0;
0b559d95 2278 for (Int_t iconf = 0; iconf<fkRecoParam->GetNumberOfSeedConfigs(); iconf++) {
41702fec 2279 pars[0] = configs[iconf];
2280 pars[1] = ntracks;
d931f2aa 2281 pars[2] = istack;
41702fec 2282 ntracks = MakeSeeds(stack, &sseed[6*ntracks], pars);
6e39bde4 2283 //AliInfo(Form("Number of Tracks after iteration step %d: %d\n", iconf, ntracks));
41702fec 2284 if(ntracks == kMaxTracksStack) break;
2285 }
980d5a2a 2286 AliDebug(2, Form("Candidate TRD tracks %d in iteration %d.", ntracks, fSieveSeeding));
41702fec 2287 if(!ntracks) break;
2288
2289 // Sort the seeds according to their quality
2290 Int_t sort[kMaxTracksStack];
2291 TMath::Sort(ntracks, fTrackQuality, sort, kTRUE);
68f9b6bd 2292 if(AliLog::GetDebugLevel("TRD", "AliTRDtrackerV1") > 2){
2293 AliDebug(3, "Track candidates classification:");
2294 for (Int_t it(0); it < ntracks; it++) {
2295 Int_t jt(sort[it]);
2296 printf(" %2d idx[%d] Quality[%e]\n", it, jt, fTrackQuality[jt]);
2297 }
2298 }
41702fec 2299
2300 // Initialize number of tracks so far and logic switches
2301 Int_t ntracks0 = esdTrackList->GetEntriesFast();
2302 Bool_t signedTrack[kMaxTracksStack];
2303 Bool_t fakeTrack[kMaxTracksStack];
2304 for (Int_t i=0; i<ntracks; i++){
2305 signedTrack[i] = kFALSE;
2306 fakeTrack[i] = kFALSE;
2307 }
2308 //AliInfo("Selecting track candidates ...");
2309
2310 // Sieve clusters in decreasing order of track quality
68f9b6bd 2311 Int_t jSieve(0), rejectedCandidates(0);
41702fec 2312 do{
41702fec 2313 // Check track candidates
68f9b6bd 2314 rejectedCandidates=0;
41702fec 2315 for (Int_t itrack = 0; itrack < ntracks; itrack++) {
804bb02e 2316 Int_t trackIndex = sort[itrack];
2317 if (signedTrack[trackIndex] || fakeTrack[trackIndex]) continue;
41702fec 2318
804bb02e 2319 // Calculate track parameters from tracklets seeds
804bb02e 2320 Int_t ncl = 0;
2321 Int_t nused = 0;
2322 Int_t nlayers = 0;
2323 Int_t findable = 0;
2324 for (Int_t jLayer = 0; jLayer < kNPlanes; jLayer++) {
2325 Int_t jseed = kNPlanes*trackIndex+jLayer;
68f9b6bd 2326 sseed[jseed].UpdateUsed();
804bb02e 2327 if(!sseed[jseed].IsOK()) continue;
68f9b6bd 2328 // check if primary candidate
f29f13a6 2329 if (TMath::Abs(sseed[jseed].GetYref(0) / sseed[jseed].GetX0()) < 0.158) findable++;
68f9b6bd 2330 ncl += sseed[jseed].GetN();
804bb02e 2331 nused += sseed[jseed].GetNUsed();
2332 nlayers++;
804bb02e 2333 }
2334
f29f13a6 2335 // Filter duplicated tracks
2336 if (nused > 30){
68f9b6bd 2337 AliDebug(4, Form("REJECTED : %d idx[%d] quality[%e] tracklets[%d] usedClusters[%d]", itrack, trackIndex, fTrackQuality[trackIndex], nlayers, nused));
f29f13a6 2338 fakeTrack[trackIndex] = kTRUE;
2339 continue;
2340 }
5ef88e00 2341 if (ncl>0 && Float_t(nused)/ncl >= .25){
68f9b6bd 2342 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 2343 fakeTrack[trackIndex] = kTRUE;
2344 continue;
2345 }
41702fec 2346
68f9b6bd 2347 AliDebug(4, Form("Candidate[%d] Quality[%e] Tracklets[%d] Findable[%d] Ncl[%d] Nused[%d]", trackIndex, fTrackQuality[trackIndex], nlayers, findable, ncl, nused));
2348
f29f13a6 2349 // Classify tracks
2350 Bool_t skip = kFALSE;
2351 switch(jSieve){
68f9b6bd 2352 case 0: // select 6 tracklets primary tracks, good quality
2353 if(nlayers > findable || nlayers < kNPlanes) {skip = kTRUE; break;}
f29f13a6 2354 if(TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -5.){skip = kTRUE; break;}
2355 break;
2356
68f9b6bd 2357 case 1: // select shorter primary tracks, good quality
2358 if(findable<4){skip = kTRUE; break;}
f29f13a6 2359 if(nlayers < findable){skip = kTRUE; break;}
2360 if(TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -4.){skip = kTRUE; break;}
2361 break;
2362
68f9b6bd 2363 case 2: // select 6 tracklets secondary tracks
2364 if(nlayers < kNPlanes) { skip = kTRUE; break;}
f29f13a6 2365 if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -6.0){skip = kTRUE; break;}
2366 break;
2367
68f9b6bd 2368 case 3: // select shorter tracks, good quality
2369 if (nlayers<4){skip = kTRUE; break;}
f29f13a6 2370 if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -5.){skip = kTRUE; break;}
2371 break;
2372
68f9b6bd 2373 case 4: // select anything with at least 4 tracklets
2374 if (nlayers<4){skip = kTRUE; break;}
f29f13a6 2375 //if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) - nused/(nlayers-3.0) < -15.0){skip = kTRUE; break;}
2376 break;
2377 }
2378 if(skip){
68f9b6bd 2379 rejectedCandidates++;
5ef88e00 2380 AliDebug(4, Form("REJECTED : %d idx[%d] quality[%e] tracklets[%d] usedClusters[%d]", itrack, trackIndex, fTrackQuality[trackIndex], nlayers, nused));
f29f13a6 2381 continue;
5ef88e00 2382 } else AliDebug(4, Form("ACCEPTED : %d idx[%d] quality[%e] tracklets[%d] usedClusters[%d]", itrack, trackIndex, fTrackQuality[trackIndex], nlayers, nused));
2383
f29f13a6 2384 signedTrack[trackIndex] = kTRUE;
2385
68f9b6bd 2386 AliTRDseedV1 *lseed =&sseed[trackIndex*kNPlanes];
2387 AliTRDtrackV1 *track = MakeTrack(lseed);
2388 if(!track){
2389 AliDebug(1, "Track building failed.");
2390 continue;
2391 } else {
2392 if(AliLog::GetDebugLevel("TRD", "AliTRDtrackerV1") > 1){
2393 Int_t ich = 0; while(!(chamber = stack[ich])) ich++;
2394 AliDebug(2, Form("Track pt=%7.2fGeV/c SM[%2d] Done.", track->Pt(), fGeom->GetSector(chamber->GetDetector())));
2395 }
2396 }
f29f13a6 2397
9e85cb05 2398 if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 1 && fkReconstructor->IsDebugStreaming()){
eb2b4f91 2399 //AliInfo(Form("Track %d [%d] nlayers %d trackQuality = %e nused %d, yref = %3.3f", itrack, trackIndex, nlayers, fTrackQuality[trackIndex], nused, trackParams[1]));
f29f13a6 2400
f29f13a6 2401 AliTRDseedV1 *dseed[6];
b82b4de1 2402 for(Int_t iseed = AliTRDgeometry::kNlayer; iseed--;) dseed[iseed] = new AliTRDseedV1(lseed[iseed]);
f29f13a6 2403
2404 //Int_t eventNrInFile = esd->GetEventNumberInFile();
f29f13a6 2405 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2406 Int_t trackNumber = AliTRDtrackerDebug::GetTrackNumber();
2407 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
a2fbb6ec 2408 TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
f29f13a6 2409 cstreamer << "Clusters2TracksStack"
68f9b6bd 2410 << "EventNumber=" << eventNumber
2411 << "TrackNumber=" << trackNumber
2412 << "CandidateNumber=" << candidateNumber
2413 << "Iter=" << fSieveSeeding
2414 << "Like=" << fTrackQuality[trackIndex]
2415 << "S0.=" << dseed[0]
2416 << "S1.=" << dseed[1]
2417 << "S2.=" << dseed[2]
2418 << "S3.=" << dseed[3]
2419 << "S4.=" << dseed[4]
2420 << "S5.=" << dseed[5]
2421 << "Ncl=" << ncl
2422 << "NLayers=" << nlayers
2423 << "Findable=" << findable
2424 << "NUsed=" << nused
f29f13a6 2425 << "\n";
2426 }
d877f55f 2427
68f9b6bd 2428
f29f13a6 2429 AliESDtrack *esdTrack = new ((*esdTrackList)[ntracks0++]) AliESDtrack();
2430 esdTrack->UpdateTrackParams(track, AliESDtrack::kTRDout);
2431 esdTrack->SetLabel(track->GetLabel());
2432 track->UpdateESDtrack(esdTrack);
2433 // write ESD-friends if neccessary
9e85cb05 2434 if (fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 0){
f29f13a6 2435 AliTRDtrackV1 *calibTrack = new AliTRDtrackV1(*track);
2436 calibTrack->SetOwner();
2437 esdTrack->AddCalibObject(calibTrack);
2438 }
2439 ntracks1++;
2440 AliTRDtrackerDebug::SetTrackNumber(AliTRDtrackerDebug::GetTrackNumber() + 1);
41702fec 2441 }
2442
2443 jSieve++;
68f9b6bd 2444 } while(jSieve<5 && rejectedCandidates); // end track candidates sieve
41702fec 2445 if(!ntracks1) break;
2446
2447 // increment counters
2448 ntracks2 += ntracks1;
4302c900 2449
4d6aee34 2450 if(fkReconstructor->IsHLT()) break;
41702fec 2451 fSieveSeeding++;
2452
2453 // Rebuild plane configurations and indices taking only unused clusters into account
2454 quality = BuildSeedingConfigs(stack, configs);
4d6aee34 2455 if(quality < 1.E-7) break; //fkReconstructor->GetRecoParam() ->GetPlaneQualityThreshold()) break;
41702fec 2456
2457 for(Int_t ip = 0; ip < kNPlanes; ip++){
2458 if(!(chamber = stack[ip])) continue;
c79857d5 2459 chamber->Build(fGeom);//Indices(fSieveSeeding);
41702fec 2460 }
2461
9e85cb05 2462 if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 10){
41702fec 2463 AliInfo(Form("Sieve level %d Plane config %d %d %d Quality %f", fSieveSeeding, configs[0], configs[1], configs[2], quality));
2464 }
2465 } while(fSieveSeeding<10); // end stack clusters sieve
2466
2467
2468
2469 //AliInfo(Form("Registered TRD tracks %d in stack %d.", ntracks2, pars[1]));
2470
2471 return ntracks2;
e4f2f73d 2472}
2473
2474//___________________________________________________________________
eb38ed55 2475Double_t AliTRDtrackerV1::BuildSeedingConfigs(AliTRDtrackingChamber **stack, Int_t *configs)
e4f2f73d 2476{
41702fec 2477 //
2478 // Assign probabilities to chambers according to their
2479 // capability of producing seeds.
2480 //
2481 // Parameters :
2482 //
2483 // layers : Array of stack propagation layers for all 6 chambers in one stack
2484 // configs : On exit array of configuration indexes (see GetSeedingConfig()
2485 // for details) in the decreasing order of their seeding probabilities.
2486 //
2487 // Output :
2488 //
2489 // Return top configuration quality
2490 //
2491 // Detailed description:
2492 //
2493 // To each chamber seeding configuration (see GetSeedingConfig() for
2494 // the list of all configurations) one defines 2 quality factors:
2495 // - an apriori topological quality (see GetSeedingConfig() for details) and
2496 // - a data quality based on the uniformity of the distribution of
2497 // clusters over the x range (time bins population). See CookChamberQA() for details.
2498 // The overall chamber quality is given by the product of this 2 contributions.
2499 //
2500
eb2b4f91 2501 Double_t chamberQ[kNPlanes];memset(chamberQ, 0, kNPlanes*sizeof(Double_t));
4d6aee34 2502 AliTRDtrackingChamber *chamber = NULL;
41702fec 2503 for(int iplane=0; iplane<kNPlanes; iplane++){
2504 if(!(chamber = stack[iplane])) continue;
2505 chamberQ[iplane] = (chamber = stack[iplane]) ? chamber->GetQuality() : 0.;
2506 }
2507
eb2b4f91 2508 Double_t tconfig[kNConfigs];memset(tconfig, 0, kNConfigs*sizeof(Double_t));
2509 Int_t planes[] = {0, 0, 0, 0};
41702fec 2510 for(int iconf=0; iconf<kNConfigs; iconf++){
2511 GetSeedingConfig(iconf, planes);
2512 tconfig[iconf] = fgTopologicQA[iconf];
2513 for(int iplane=0; iplane<4; iplane++) tconfig[iconf] *= chamberQ[planes[iplane]];
2514 }
2515
2516 TMath::Sort((Int_t)kNConfigs, tconfig, configs, kTRUE);
0b559d95 2517 // AliInfo(Form("q[%d] = %f", configs[0], tconfig[configs[0]]));
41702fec 2518 // AliInfo(Form("q[%d] = %f", configs[1], tconfig[configs[1]]));
2519 // AliInfo(Form("q[%d] = %f", configs[2], tconfig[configs[2]]));
2520
2521 return tconfig[configs[0]];
e4f2f73d 2522}
2523
2524//____________________________________________________________________
e17f4785 2525Int_t AliTRDtrackerV1::MakeSeeds(AliTRDtrackingChamber **stack, AliTRDseedV1 * const sseed, const Int_t * const ipar)
e4f2f73d 2526{
afa21247 2527//
2a3191bb 2528// Seed tracklets and build candidate TRD tracks. The procedure is used during barrel tracking to account for tracks which are
2529// either missed by TPC prolongation or conversions inside the TRD volume.
2530// For stand alone tracking the procedure is used to estimate all tracks measured by TRD.
afa21247 2531//
2532// Parameters :
2533// layers : Array of stack propagation layers containing clusters
2534// sseed : Array of empty tracklet seeds. On exit they are filled.
2535// ipar : Control parameters:
2536// ipar[0] -> seeding chambers configuration
2537// ipar[1] -> stack index
2538// ipar[2] -> number of track candidates found so far
2539//
2540// Output :
2541// Number of tracks candidates found.
2542//
2543// The following steps are performed:
2544// 1. Build seeding layers by collapsing all time bins from each of the four seeding chambers along the
2545// radial coordinate. See AliTRDtrackingChamber::GetSeedingLayer() for details. The chambers selection for seeding
2546// is described in AliTRDtrackerV1::Clusters2TracksStack().
2547// 2. Using the seeding clusters from the seeding layer (step 1) build combinatorics using the following algorithm:
2548// - for each seeding cluster in the lower seeding layer find
2549// - all seeding clusters in the upper seeding layer inside a road defined by a given phi angle. The angle
2550// is calculated on the minimum pt of tracks from vertex accesible to the stand alone tracker.
2551// - for each pair of two extreme seeding clusters select middle upper cluster using roads defined externally by the
2552// reco params
2553// - select last seeding cluster as the nearest to the linear approximation of the track described by the first three
2554// seeding clusters.
2555// The implementation of road calculation and cluster selection can be found in the functions AliTRDchamberTimeBin::BuildCond()
2556// and AliTRDchamberTimeBin::GetClusters().
2557// 3. Helix fit of the seeding clusters set. (see AliTRDtrackerFitter::FitRieman(AliTRDcluster**)). No tilt correction is
2558// performed at this level
2559// 4. Initialize seeding tracklets in the seeding chambers.
2560// 5. *Filter 0* Chi2 cut on the Y and Z directions. The threshold is set externally by the reco params.
2561// 6. Attach (true) clusters to seeding tracklets (see AliTRDseedV1::AttachClusters()) and fit tracklet (see
2562// AliTRDseedV1::Fit()). The number of used clusters used by current seeds should not exceed ... (25).
2563// 7. *Filter 1* Check if all 4 seeding tracklets are correctly constructed.
2564// 8. Helix fit of the clusters from the seeding tracklets with tilt correction. Refit tracklets using the new
2565// approximation of the track.
2566// 9. *Filter 2* Calculate likelihood of the track. (See AliTRDtrackerV1::CookLikelihood()). The following quantities are
2567// checked against the Riemann fit:
2568// - position resolution in y
2569// - angular resolution in the bending plane
2570// - likelihood of the number of clusters attached to the tracklet
2571// 10. Extrapolation of the helix fit to the other 2 chambers *non seeding* chambers:
2572// - Initialization of extrapolation tracklets with the fit parameters
2573// - Attach clusters to extrapolated tracklets
2574// - Helix fit of tracklets
2575// 11. Improve seeding tracklets quality by reassigning clusters based on the last parameters of the track
2576// See AliTRDtrackerV1::ImproveSeedQuality() for details.
2577// 12. Helix fit of all 6 seeding tracklets and chi2 calculation
2578// 13. Hyperplane fit and track quality calculation. See AliTRDtrackerFitter::FitHyperplane() for details.
2579// 14. Cooking labels for tracklets. Should be done only for MC
2580// 15. Register seeds.
2581//
2582// Authors:
2583// Marian Ivanov <M.Ivanov@gsi.de>
2584// Alexandru Bercuci <A.Bercuci@gsi.de>
2585// Markus Fasel <M.Fasel@gsi.de>
41702fec 2586
4d6aee34 2587 AliTRDtrackingChamber *chamber = NULL;
2588 AliTRDcluster *c[kNSeedPlanes] = {NULL, NULL, NULL, NULL}; // initilize seeding clusters
e17f4785 2589 AliTRDseedV1 *cseed = &sseed[0]; // initialize tracklets for first track
41702fec 2590 Int_t ncl, mcl; // working variable for looping over clusters
2591 Int_t index[AliTRDchamberTimeBin::kMaxClustersLayer], jndex[AliTRDchamberTimeBin::kMaxClustersLayer];
2592 // chi2 storage
2593 // chi2[0] = tracklet chi2 on the Z direction
2594 // chi2[1] = tracklet chi2 on the R direction
2595 Double_t chi2[4];
2596
afa21247 2597 // this should be data member of AliTRDtrack TODO
41702fec 2598 Double_t seedQuality[kMaxTracksStack];
2599
2600 // unpack control parameters
2601 Int_t config = ipar[0];
2602 Int_t ntracks = ipar[1];
d931f2aa 2603 Int_t istack = ipar[2];
41702fec 2604 Int_t planes[kNSeedPlanes]; GetSeedingConfig(config, planes);
afa21247 2605 Int_t planesExt[kNPlanes-kNSeedPlanes]; GetExtrapolationConfig(config, planesExt);
be24510a 2606
2607
41702fec 2608 // Init chambers geometry
41702fec 2609 Double_t hL[kNPlanes]; // Tilting angle
2610 Float_t padlength[kNPlanes]; // pad lenghts
dd8059a8 2611 Float_t padwidth[kNPlanes]; // pad widths
4d6aee34 2612 AliTRDpadPlane *pp = NULL;
41702fec 2613 for(int iplane=0; iplane<kNPlanes; iplane++){
2614 pp = fGeom->GetPadPlane(iplane, istack);
bb79ccd5 2615 hL[iplane] = TMath::Tan(TMath::DegToRad()*pp->GetTiltingAngle());
41702fec 2616 padlength[iplane] = pp->GetLengthIPad();
dd8059a8 2617 padwidth[iplane] = pp->GetWidthIPad();
41702fec 2618 }
2619
eb2b4f91 2620 // Init anode wire position for chambers
e165b64b 2621 Double_t x0[kNPlanes], // anode wire position
eb2b4f91 2622 driftLength = .5*AliTRDgeometry::AmThick() - AliTRDgeometry::DrThick(); // drift length
4d6aee34 2623 TGeoHMatrix *matrix = NULL;
eb2b4f91 2624 Double_t loc[] = {AliTRDgeometry::AnodePos(), 0., 0.};
2625 Double_t glb[] = {0., 0., 0.};
2626 AliTRDtrackingChamber **cIter = &stack[0];
a3743898 2627 for(int iLayer=0; iLayer<kNPlanes; iLayer++,cIter++){
eb2b4f91 2628 if(!(*cIter)) continue;
e165b64b 2629 if(!(matrix = fGeom->GetClusterMatrix((*cIter)->GetDetector()))){
2630 continue;
2631 x0[iLayer] = fgkX0[iLayer];
2632 }
eb2b4f91 2633 matrix->LocalToMaster(loc, glb);
2634 x0[iLayer] = glb[0];
2635 }
2636
980d5a2a 2637 AliDebug(2, Form("Making seeds Stack[%d] Config[%d] Tracks[%d]...", istack, config, ntracks));
41702fec 2638
d931f2aa 2639 // Build seeding layers
d611c74f 2640 ResetSeedTB();
41702fec 2641 Int_t nlayers = 0;
41702fec 2642 for(int isl=0; isl<kNSeedPlanes; isl++){
2643 if(!(chamber = stack[planes[isl]])) continue;
4d6aee34 2644 if(!chamber->GetSeedingLayer(fSeedTB[isl], fGeom, fkReconstructor)) continue;
41702fec 2645 nlayers++;
41702fec 2646 }
eb2b4f91 2647 if(nlayers < kNSeedPlanes) return ntracks;
41702fec 2648
2649
2650 // Start finding seeds
2651 Double_t cond0[4], cond1[4], cond2[4];
2652 Int_t icl = 0;
d611c74f 2653 while((c[3] = (*fSeedTB[3])[icl++])){
41702fec 2654 if(!c[3]) continue;
d611c74f 2655 fSeedTB[0]->BuildCond(c[3], cond0, 0);
2656 fSeedTB[0]->GetClusters(cond0, index, ncl);
41702fec 2657 //printf("Found c[3] candidates 0 %d\n", ncl);
2658 Int_t jcl = 0;
2659 while(jcl<ncl) {
d611c74f 2660 c[0] = (*fSeedTB[0])[index[jcl++]];
41702fec 2661 if(!c[0]) continue;
2662 Double_t dx = c[3]->GetX() - c[0]->GetX();
afa21247 2663 Double_t dzdx = (c[3]->GetZ() - c[0]->GetZ())/dx;
2664 Double_t dydx = (c[3]->GetY() - c[0]->GetY())/dx;
2665 fSeedTB[1]->BuildCond(c[0], cond1, 1, dzdx, dydx);
d611c74f 2666 fSeedTB[1]->GetClusters(cond1, jndex, mcl);
41702fec 2667 //printf("Found c[0] candidates 1 %d\n", mcl);
2668
2669 Int_t kcl = 0;
2670 while(kcl<mcl) {
d611c74f 2671 c[1] = (*fSeedTB[1])[jndex[kcl++]];
2672 if(!c[1]) continue;
afa21247 2673 fSeedTB[2]->BuildCond(c[1], cond2, 2, dzdx, dydx);
d611c74f 2674 c[2] = fSeedTB[2]->GetNearestCluster(cond2);
2675 //printf("Found c[1] candidate 2 %p\n", c[2]);
2676 if(!c[2]) continue;
980d5a2a 2677
2678 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].",
2679 c[0]->GetX(), c[0]->GetY(), c[0]->GetZ(),
2680 c[1]->GetX(), c[1]->GetY(), c[1]->GetZ(),
2681 c[2]->GetX(), c[2]->GetY(), c[2]->GetZ(),
2682 c[3]->GetX(), c[3]->GetY(), c[3]->GetZ()));
d611c74f 2683
804bb02e 2684 for (Int_t il = 0; il < kNPlanes; il++) cseed[il].Reset();
41702fec 2685
d611c74f 2686 FitRieman(c, chi2);
2687
d931f2aa 2688 AliTRDseedV1 *tseed = &cseed[0];
bb2db46c 2689 cIter = &stack[0];
2690 for(int iLayer=0; iLayer<kNPlanes; iLayer++, tseed++, cIter++){
2691 Int_t det = (*cIter) ? (*cIter)->GetDetector() : -1;
eb2b4f91 2692 tseed->SetDetector(det);
43d6ad34 2693 tseed->SetTilt(hL[iLayer]);
2694 tseed->SetPadLength(padlength[iLayer]);
dd8059a8 2695 tseed->SetPadWidth(padwidth[iLayer]);
4d6aee34 2696 tseed->SetReconstructor(fkReconstructor);
eb2b4f91 2697 tseed->SetX0(det<0 ? fR[iLayer]+driftLength : x0[iLayer]);
d611c74f 2698 tseed->Init(GetRiemanFitter());
f29f13a6 2699 tseed->SetStandAlone(kTRUE);
d611c74f 2700 }
2701
2702 Bool_t isFake = kFALSE;
9e85cb05 2703 if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) >= 2 && fkReconstructor->IsDebugStreaming()){
d611c74f 2704 if (c[0]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
2705 if (c[1]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
2706 if (c[2]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
2707
2708 Double_t xpos[4];
2709 for(Int_t l = 0; l < kNSeedPlanes; l++) xpos[l] = fSeedTB[l]->GetX();
2710 Float_t yref[4];
2711 for(int il=0; il<4; il++) yref[il] = cseed[planes[il]].GetYref(0);
2712 Int_t ll = c[3]->GetLabel(0);
2713 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2714 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2715 AliRieman *rim = GetRiemanFitter();
a2fbb6ec 2716 TTreeSRedirector &cs0 = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
d611c74f 2717 cs0 << "MakeSeeds0"
2718 <<"EventNumber=" << eventNumber
2719 <<"CandidateNumber=" << candidateNumber
2720 <<"isFake=" << isFake
2721 <<"config=" << config
2722 <<"label=" << ll
2723 <<"chi2z=" << chi2[0]
2724 <<"chi2y=" << chi2[1]
2725 <<"Y2exp=" << cond2[0]
2726 <<"Z2exp=" << cond2[1]
2727 <<"X0=" << xpos[0] //layer[sLayer]->GetX()
2728 <<"X1=" << xpos[1] //layer[sLayer + 1]->GetX()
2729 <<"X2=" << xpos[2] //layer[sLayer + 2]->GetX()
2730 <<"X3=" << xpos[3] //layer[sLayer + 3]->GetX()
2731 <<"yref0=" << yref[0]
2732 <<"yref1=" << yref[1]
2733 <<"yref2=" << yref[2]
2734 <<"yref3=" << yref[3]
2735 <<"c0.=" << c[0]
2736 <<"c1.=" << c[1]
2737 <<"c2.=" << c[2]
2738 <<"c3.=" << c[3]
2739 <<"Seed0.=" << &cseed[planes[0]]
2740 <<"Seed1.=" << &cseed[planes[1]]
2741 <<"Seed2.=" << &cseed[planes[2]]
2742 <<"Seed3.=" << &cseed[planes[3]]
2743 <<"RiemanFitter.=" << rim
2744 <<"\n";
2745 }
9e85cb05 2746 if(chi2[0] > fkRecoParam->GetChi2Z()/*7./(3. - sLayer)*//*iter*/){
980d5a2a 2747 AliDebug(3, Form("Filter on chi2Z [%f].", chi2[0]));
d611c74f 2748 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2749 continue;
2750 }
9e85cb05 2751 if(chi2[1] > fkRecoParam->GetChi2Y()/*1./(3. - sLayer)*//*iter*/){
980d5a2a 2752 AliDebug(3, Form("Filter on chi2Y [%f].", chi2[1]));
d611c74f 2753 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2754 continue;
2755 }
2756 //AliInfo("Passed chi2 filter.");
2757
2758 // try attaching clusters to tracklets
6e39bde4 2759 Int_t mlayers = 0;
980d5a2a 2760 AliTRDcluster *cl = NULL;
be24510a 2761 for(int iLayer=0; iLayer<kNSeedPlanes; iLayer++){
d611c74f 2762 Int_t jLayer = planes[iLayer];
980d5a2a 2763 Int_t nNotInChamber = 0;
f29f13a6 2764 if(!cseed[jLayer].AttachClusters(stack[jLayer], kTRUE)) continue;
980d5a2a 2765 if(/*fkReconstructor->IsHLT()*/kFALSE){
2766 cseed[jLayer].UpdateUsed();
2767 if(!cseed[jLayer].IsOK()) continue;
2768 }else{
2769 cseed[jLayer].Fit();
2770 cseed[jLayer].UpdateUsed();
2771 cseed[jLayer].ResetClusterIter();
2772 while((cl = cseed[jLayer].NextCluster())){
2773 if(!cl->IsInChamber()) nNotInChamber++;
2774 }
2775 //printf("clusters[%d], used[%d], not in chamber[%d]\n", cseed[jLayer].GetN(), cseed[jLayer].GetNUsed(), nNotInChamber);
2776 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
2777 }
d611c74f 2778 mlayers++;
2779 }
be24510a 2780
2781 if(mlayers < kNSeedPlanes){
980d5a2a 2782 AliDebug(2, Form("Found only %d tracklets out of %d. Skip.", mlayers, kNSeedPlanes));
be24510a 2783 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2784 continue;
2785 }
2786
2787 // temporary exit door for the HLT
4d6aee34 2788 if(fkReconstructor->IsHLT()){
be24510a 2789 // attach clusters to extrapolation chambers
2790 for(int iLayer=0; iLayer<kNPlanes-kNSeedPlanes; iLayer++){
2791 Int_t jLayer = planesExt[iLayer];
2792 if(!(chamber = stack[jLayer])) continue;
980d5a2a 2793 if(!cseed[jLayer].AttachClusters(chamber, kTRUE)) continue;
5f1ae1e7 2794 cseed[jLayer].Fit();
be24510a 2795 }
0b559d95 2796 //FitTiltedRiemanConstraint(&cseed[0], GetZ());
4302c900 2797 fTrackQuality[ntracks] = 1.; // dummy value
2798 ntracks++;
218ba867 2799 if(ntracks == kMaxTracksStack) return ntracks;
4302c900 2800 cseed += 6;
2801 continue;
2802 }
2803
be24510a 2804
f29f13a6 2805 // Update Seeds and calculate Likelihood
d611c74f 2806 // fit tracklets and cook likelihood
68f9b6bd 2807 Double_t chi2Vals[4];
2808 chi2Vals[0] = FitTiltedRieman(&cseed[0], kTRUE);
f29f13a6 2809 for(int iLayer=0; iLayer<kNSeedPlanes; iLayer++){
2810 Int_t jLayer = planes[iLayer];
2eb10c34 2811 cseed[jLayer].Fit(1);
f29f13a6 2812 }
91834b8d 2813 Double_t like = CookLikelihood(&cseed[0], planes); // to be checked
d611c74f 2814
9e85cb05 2815 if (TMath::Log(1.E-9 + like) < fkRecoParam->GetTrackLikelihood()){
980d5a2a 2816 AliDebug(3, Form("Filter on likelihood %f[%e].", TMath::Log(1.E-9 + like), like));
d611c74f 2817 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2818 continue;
2819 }
2820 //AliInfo(Form("Passed likelihood %f[%e].", TMath::Log(1.E-9 + like), like));
2821
2822 // book preliminary results
2823 seedQuality[ntracks] = like;
2824 fSeedLayer[ntracks] = config;/*sLayer;*/
2825
2826 // attach clusters to the extrapolation seeds
980d5a2a 2827 Int_t elayers(0);
be24510a 2828 for(int iLayer=0; iLayer<kNPlanes-kNSeedPlanes; iLayer++){
2829 Int_t jLayer = planesExt[iLayer];
d611c74f 2830 if(!(chamber = stack[jLayer])) continue;
d611c74f 2831
2832 // fit extrapolated seed
2833 if ((jLayer == 0) && !(cseed[1].IsOK())) continue;
2834 if ((jLayer == 5) && !(cseed[4].IsOK())) continue;
2835 AliTRDseedV1 pseed = cseed[jLayer];
f29f13a6 2836 if(!pseed.AttachClusters(chamber, kTRUE)) continue;
2eb10c34 2837 pseed.Fit(1);
d611c74f 2838 cseed[jLayer] = pseed;
68f9b6bd 2839 chi2Vals[0] = FitTiltedRieman(cseed, kTRUE);
2eb10c34 2840 cseed[jLayer].Fit(1);
980d5a2a 2841 elayers++;
d611c74f 2842 }
2843
2844 // AliInfo("Extrapolation done.");
2845 // Debug Stream containing all the 6 tracklets
9e85cb05 2846 if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) >= 2 && fkReconstructor->IsDebugStreaming()){
a2fbb6ec 2847 TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
d611c74f 2848 TLinearFitter *tiltedRieman = GetTiltedRiemanFitter();
2849 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2850 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2851 cstreamer << "MakeSeeds1"
2852 << "EventNumber=" << eventNumber
2853 << "CandidateNumber=" << candidateNumber
2854 << "S0.=" << &cseed[0]
2855 << "S1.=" << &cseed[1]
2856 << "S2.=" << &cseed[2]
2857 << "S3.=" << &cseed[3]
2858 << "S4.=" << &cseed[4]
2859 << "S5.=" << &cseed[5]
2860 << "FitterT.=" << tiltedRieman
2861 << "\n";
2862 }
2863
9e85cb05 2864 if(fkRecoParam->HasImproveTracklets()){
68f9b6bd 2865 if(!ImproveSeedQuality(stack, cseed, chi2Vals[0])){
980d5a2a 2866 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
68f9b6bd 2867 AliDebug(3, "ImproveSeedQuality() failed.");
980d5a2a 2868 }
d611c74f 2869 }
d611c74f 2870
68f9b6bd 2871 // do track fitting with vertex constraint
2872 if(fkRecoParam->IsVertexConstrained()) chi2Vals[1] = FitTiltedRiemanConstraint(&cseed[0], GetZ());
2873 else chi2Vals[1] = -1.;
2874 chi2Vals[2] = GetChi2Z(&cseed[0]);
2875 chi2Vals[3] = GetChi2Phi(&cseed[0]);
2876
2877 // calculate track quality
2878 fTrackQuality[ntracks] = CalculateTrackLikelihood(&chi2Vals[0]);
fac58f00 2879
9e85cb05 2880 if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) >= 2 && fkReconstructor->IsDebugStreaming()){
a2fbb6ec 2881 TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
d611c74f 2882 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2883 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2884 TLinearFitter *fitterTC = GetTiltedRiemanFitterConstraint();
2885 TLinearFitter *fitterT = GetTiltedRiemanFitter();
91834b8d 2886 Int_t ncls = 0;
2887 for(Int_t iseed = 0; iseed < kNPlanes; iseed++){
2888 ncls += cseed[iseed].IsOK() ? cseed[iseed].GetN2() : 0;
2889 }
d611c74f 2890 cstreamer << "MakeSeeds2"
2891 << "EventNumber=" << eventNumber
2892 << "CandidateNumber=" << candidateNumber
2893 << "Chi2TR=" << chi2Vals[0]
2894 << "Chi2TC=" << chi2Vals[1]
2895 << "Nlayers=" << mlayers
91834b8d 2896 << "NClusters=" << ncls
d611c74f 2897 << "Like=" << like
2898 << "S0.=" << &cseed[0]
2899 << "S1.=" << &cseed[1]
2900 << "S2.=" << &cseed[2]
2901 << "S3.=" << &cseed[3]
2902 << "S4.=" << &cseed[4]
2903 << "S5.=" << &cseed[5]
d611c74f 2904 << "FitterT.=" << fitterT
2905 << "FitterTC.=" << fitterTC
2906 << "\n";
2907 }
68f9b6bd 2908 if(AliLog::GetDebugLevel("TRD", "AliTRDtrackerV1")){
2909 Double_t pt[]={0., 0.};
2910 for(Int_t il(0); il<kNPlanes; il++){
2911 if(!cseed[il].IsOK()) continue;
2912 pt[0] = GetBz()*kB2C/cseed[il].GetC();
2913 pt[1] = GetBz()*kB2C/cseed[il].GetC(1);
2914 break;
2915 }
2916 AliDebug(2, Form("Candidate[%2d] pt[%7.3f %7.3f] Q[%e]\n"
2917 " [0] x[%6.2f] n[%2d] nu[%d] OK[%c]\n"
2918 " [1] x[%6.2f] n[%2d] nu[%d] OK[%c]\n"
2919 " [2] x[%6.2f] n[%2d] nu[%d] OK[%c]\n"
2920 " [3] x[%6.2f] n[%2d] nu[%d] OK[%c]\n"
2921 " [4] x[%6.2f] n[%2d] nu[%d] OK[%c]\n"
2922 " [5] x[%6.2f] n[%2d] nu[%d] OK[%c]"
2923 , ntracks, pt[0], pt[1], fTrackQuality[ntracks]
2924 ,cseed[0].GetX(), cseed[0].GetN(), cseed[0].GetNUsed(), cseed[0].IsOK()?'y':'n'
2925 ,cseed[1].GetX(), cseed[1].GetN(), cseed[1].GetNUsed(), cseed[1].IsOK()?'y':'n'
2926 ,cseed[2].GetX(), cseed[2].GetN(), cseed[2].GetNUsed(), cseed[2].IsOK()?'y':'n'
2927 ,cseed[3].GetX(), cseed[3].GetN(), cseed[3].GetNUsed(), cseed[3].IsOK()?'y':'n'
2928 ,cseed[4].GetX(), cseed[4].GetN(), cseed[4].GetNUsed(), cseed[4].IsOK()?'y':'n'
2929 ,cseed[5].GetX(), cseed[5].GetN(), cseed[5].GetNUsed(), cseed[5].IsOK()?'y':'n'));
2930 }
d611c74f 2931 ntracks++;
2932 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2933 if(ntracks == kMaxTracksStack){
2934 AliWarning(Form("Number of seeds reached maximum allowed (%d) in stack.", kMaxTracksStack));
2935 return ntracks;
2936 }
2937 cseed += 6;
41702fec 2938 }
2939 }
2940 }
41702fec 2941
2942 return ntracks;
e4f2f73d 2943}
2944
2945//_____________________________________________________________________________
68f9b6bd 2946AliTRDtrackV1* AliTRDtrackerV1::MakeTrack(AliTRDseedV1 * const tracklet)
e4f2f73d 2947{
afa21247 2948//
2949// Build a TRD track out of tracklet candidates
2950//
2951// Parameters :
2952// seeds : array of tracklets
2953// params : array of track parameters as they are estimated by stand alone tracker. 7 elements.
2954// [0] - radial position of the track at reference point
2955// [1] - y position of the fit at [0]
2956// [2] - z position of the fit at [0]
2957// [3] - snp of the first tracklet
2958// [4] - tgl of the first tracklet
2959// [5] - curvature of the Riemann fit - 1/pt
2960// [6] - sector rotation angle
2961//
2962// Output :
2963// The TRD track.
2964//
2965// Initialize the TRD track based on the parameters of the fit and a parametric covariance matrix
2966// (diagonal with constant variance terms TODO - correct parameterization)
2967//
2968// In case of HLT just register the tracklets in the tracker and return values of the Riemann fit. For the
2969// offline case perform a full Kalman filter on the already found tracklets (see AliTRDtrackerV1::FollowBackProlongation()
2970// for details). Do also MC label calculation and PID if propagation successfully.
41702fec 2971
0b559d95 2972 if(fkReconstructor->IsHLT()) FitTiltedRiemanConstraint(tracklet, 0);
41702fec 2973 Double_t alpha = AliTRDgeometry::GetAlpha();
2974 Double_t shift = AliTRDgeometry::GetAlpha()/2.0;
41702fec 2975
68f9b6bd 2976 // find first good tracklet
2977 Int_t idx(0); while(idx<kNPlanes && !tracklet[idx].IsOK()) idx++;
2978 if(idx>2){ AliDebug(1, Form("Found suspect track start @ layer idx[%d]\n"
2979 " %c[0] x0[%f] n[%d] nu[%d] OK[%c]\n"
2980 " %c[1] x0[%f] n[%d] nu[%d] OK[%c]\n"
2981 " %c[2] x0[%f] n[%d] nu[%d] OK[%c]\n"
2982 " %c[3] x0[%f] n[%d] nu[%d] OK[%c]\n"
2983 " %c[4] x0[%f] n[%d] nu[%d] OK[%c]\n"
2984 " %c[5] x0[%f] n[%d] nu[%d] OK[%c]"
2985 ,idx
2986 ,idx==0?'*':' ', tracklet[0].GetX0(), tracklet[0].GetN(), tracklet[0].GetNUsed(), tracklet[0].IsOK()?'y':'n'
2987 ,idx==1?'*':' ', tracklet[1].GetX0(), tracklet[1].GetN(), tracklet[1].GetNUsed(), tracklet[1].IsOK()?'y':'n'
2988 ,idx==2?'*':' ', tracklet[2].GetX0(), tracklet[2].GetN(), tracklet[2].GetNUsed(), tracklet[2].IsOK()?'y':'n'
2989 ,idx==3?'*':' ', tracklet[3].GetX0(), tracklet[3].GetN(), tracklet[3].GetNUsed(), tracklet[3].IsOK()?'y':'n'
2990 ,idx==4?'*':' ', tracklet[4].GetX0(), tracklet[4].GetN(), tracklet[4].GetNUsed(), tracklet[4].IsOK()?'y':'n'
2991 ,idx==5?'*':' ', tracklet[5].GetX0(), tracklet[5].GetN(), tracklet[5].GetNUsed(), tracklet[5].IsOK()?'y':'n'));
2992 return NULL;
2993 }
2994
8def512c 2995 Double_t dx(5.);
2996 Double_t x(tracklet[idx].GetX0() - dx);
68f9b6bd 2997 // Build track parameters
2998 Double_t params[] = {
2999 tracklet[idx].GetYref(0) - dx*tracklet[idx].GetYref(1) // y
3000 ,tracklet[idx].GetZref(0) - dx*tracklet[idx].GetZref(1) // z
3001 ,TMath::Sin(TMath::ATan(tracklet[idx].GetYref(1))) // snp
3002 ,tracklet[idx].GetZref(1) / TMath::Sqrt(1. + tracklet[idx].GetYref(1) * tracklet[idx].GetYref(1)) // tgl
8def512c 3003 ,tracklet[idx].GetC(fkReconstructor->IsHLT()?1:0) // curvature -> 1/pt
68f9b6bd 3004 };
3005 Int_t sector(fGeom->GetSector(tracklet[idx].GetDetector()));
3006
3007 Double_t c[15];
afa21247 3008 c[ 0] = 0.2; // s^2_y
3009 c[ 1] = 0.0; c[ 2] = 2.0; // s^2_z
3010 c[ 3] = 0.0; c[ 4] = 0.0; c[ 5] = 0.02; // s^2_snp
3011 c[ 6] = 0.0; c[ 7] = 0.0; c[ 8] = 0.0; c[ 9] = 0.1; // s^2_tgl
68f9b6bd 3012 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
3013
3014 AliTRDtrackV1 track(tracklet, params, c, x, sector*alpha+shift);
41702fec 3015
4d6aee34 3016 AliTRDseedV1 *ptrTracklet = NULL;
9887cc9f 3017
3018 // skip Kalman filter for HLT
5f1ae1e7 3019 if(/*fkReconstructor->IsHLT()*/kFALSE){
9887cc9f 3020 for (Int_t jLayer = 0; jLayer < AliTRDgeometry::kNlayer; jLayer++) {
3021 track.UnsetTracklet(jLayer);
68f9b6bd 3022 ptrTracklet = &tracklet[jLayer];
9887cc9f 3023 if(!ptrTracklet->IsOK()) continue;
5f1ae1e7 3024 if(TMath::Abs(ptrTracklet->GetYref(1) - ptrTracklet->GetYfit(1)) >= .2) continue; // check this condition with Marian
9887cc9f 3025 ptrTracklet = SetTracklet(ptrTracklet);
f29f13a6 3026 ptrTracklet->UseClusters();
91834b8d 3027 track.SetTracklet(ptrTracklet, fTracklets->GetEntriesFast()-1);
3028 }
d78d7df0 3029 AliTRDtrackV1 *ptrTrack = SetTrack(&track);
799e38d7 3030 ptrTrack->CookPID();
5f1ae1e7 3031 ptrTrack->CookLabel(.9);
4d6aee34 3032 ptrTrack->SetReconstructor(fkReconstructor);
d78d7df0 3033 return ptrTrack;
91834b8d 3034 }
393fda1c 3035
b1135f96 3036 // prevent the error message in AliTracker::MeanMaterialBudget: "start point out of geometry"
68f9b6bd 3037 if(TMath::Abs(track.GetX()) + TMath::Abs(track.GetY()) + TMath::Abs(track.GetZ()) > 10000) return NULL;
17e0e535 3038
d20df6fc 3039 track.ResetCovariance(1);
e79f8eb0 3040 Int_t nc = TMath::Abs(FollowBackProlongation(track));
9e85cb05 3041 if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 5 && fkReconstructor->IsDebugStreaming()){
393fda1c 3042 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
3043 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
3044 Double_t p[5]; // Track Params for the Debug Stream
68f9b6bd 3045 track.GetExternalParameters(x, p);
a2fbb6ec 3046 TTreeSRedirector &cs = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
393fda1c 3047 cs << "MakeTrack"
3048 << "EventNumber=" << eventNumber
3049 << "CandidateNumber=" << candidateNumber
3050 << "nc=" << nc
68f9b6bd 3051 << "X=" << x
393fda1c 3052 << "Y=" << p[0]
3053 << "Z=" << p[1]
3054 << "snp=" << p[2]
3055 << "tnd=" << p[3]
3056 << "crv=" << p[4]
68f9b6bd 3057 << "Yin=" << params[0]
3058 << "Zin=" << params[1]
3059 << "snpin=" << params[2]
3060 << "tndin=" << params[3]
3061 << "crvin=" << params[4]
393fda1c 3062 << "track.=" << &track
3063 << "\n";
3064 }
68f9b6bd 3065 if (nc < 30){
3066 UnsetTrackletsTrack(&track);
3067 return NULL;
3068 }
d20df6fc 3069 AliTRDtrackV1 *ptrTrack = SetTrack(&track);
4d6aee34 3070 ptrTrack->SetReconstructor(fkReconstructor);
48f8adf3 3071 ptrTrack->CookLabel(.9);
68f9b6bd 3072 for(Int_t il(kNPlanes); il--;){
3073 if(!(ptrTracklet = ptrTrack->GetTracklet(il))) continue;
3074 ptrTracklet->UseClusters();
3075 }
3076
d20df6fc 3077 // computes PID for track
3078 ptrTrack->CookPID();
3079 // update calibration references using this track
48f8adf3 3080 AliTRDCalibraFillHisto *calibra = AliTRDCalibraFillHisto::Instance();
3081 if (!calibra){
3082 AliInfo("Could not get Calibra instance\n");
3083 if(calibra->GetHisto2d()) calibra->UpdateHistogramsV1(ptrTrack);
3084 }
d20df6fc 3085 return ptrTrack;
e4f2f73d 3086}
3087
0906e73e 3088
e4f2f73d 3089//____________________________________________________________________
68f9b6bd 3090Bool_t AliTRDtrackerV1::ImproveSeedQuality(AliTRDtrackingChamber **stack, AliTRDseedV1 *cseed, Double_t &chi2)
e4f2f73d 3091{
41702fec 3092 //
3093 // Sort tracklets according to "quality" and try to "improve" the first 4 worst
3094 //
3095 // Parameters :
3096 // layers : Array of propagation layers for a stack/supermodule
3097 // cseed : Array of 6 seeding tracklets which has to be improved
3098 //
f29f13a6 3099 // Output :
41702fec 3100 // cssed : Improved seeds
3101 //
3102 // Detailed description
3103 //
3104 // Iterative procedure in which new clusters are searched for each
3105 // tracklet seed such that the seed quality (see AliTRDseed::GetQuality())
3106 // can be maximized. If some optimization is found the old seeds are replaced.
3107 //
3108 // debug level: 7
3109 //
3110
3111 // make a local working copy
4d6aee34 3112 AliTRDtrackingChamber *chamber = NULL;
980d5a2a 3113 AliTRDseedV1 bseed[AliTRDgeometry::kNlayer];
3114
68f9b6bd 3115 Float_t quality(1.e3),
980d5a2a 3116 lQuality[] = {1.e3, 1.e3, 1.e3, 1.e3, 1.e3, 1.e3};
3117 Int_t rLayers(0);