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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
bb56afff 28// #include <Riostream.h>
29// #include <stdio.h>
30// #include <string.h>
e4f2f73d 31
32#include <TBranch.h>
bb56afff 33#include <TDirectory.h>
e4f2f73d 34#include <TLinearFitter.h>
e4f2f73d 35#include <TTree.h>
36#include <TClonesArray.h>
e4f2f73d 37#include <TTreeStream.h>
eb2b4f91 38#include <TGeoMatrix.h>
39#include <TGeoManager.h>
e4f2f73d 40
41#include "AliLog.h"
fac58f00 42#include "AliMathBase.h"
e4f2f73d 43#include "AliESDEvent.h"
bb56afff 44#include "AliGeomManager.h"
e4f2f73d 45#include "AliRieman.h"
46#include "AliTrackPointArray.h"
47
e4f2f73d 48#include "AliTRDgeometry.h"
49#include "AliTRDpadPlane.h"
e4f2f73d 50#include "AliTRDcalibDB.h"
e4f2f73d 51#include "AliTRDReconstructor.h"
52#include "AliTRDCalibraFillHisto.h"
e4f2f73d 53#include "AliTRDrecoParam.h"
bb56afff 54
55#include "AliTRDcluster.h"
e4f2f73d 56#include "AliTRDseedV1.h"
0906e73e 57#include "AliTRDtrackV1.h"
bb56afff 58#include "AliTRDtrackerV1.h"
59#include "AliTRDtrackerDebug.h"
60#include "AliTRDtrackingChamber.h"
61#include "AliTRDchamberTimeBin.h"
62
e4f2f73d 63
e4f2f73d 64
65ClassImp(AliTRDtrackerV1)
eb38ed55 66
67
68const Float_t AliTRDtrackerV1::fgkMinClustersInTrack = 0.5; //
69const Float_t AliTRDtrackerV1::fgkLabelFraction = 0.8; //
70const Double_t AliTRDtrackerV1::fgkMaxChi2 = 12.0; //
71const Double_t AliTRDtrackerV1::fgkMaxSnp = 0.95; // Maximum local sine of the azimuthal angle
72const Double_t AliTRDtrackerV1::fgkMaxStep = 2.0; // Maximal step size in propagation
d76231c8 73Double_t AliTRDtrackerV1::fgTopologicQA[kNConfigs] = {
41702fec 74 0.1112, 0.1112, 0.1112, 0.0786, 0.0786,
75 0.0786, 0.0786, 0.0579, 0.0579, 0.0474,
76 0.0474, 0.0408, 0.0335, 0.0335, 0.0335
e4f2f73d 77};
2985ffcb 78Int_t AliTRDtrackerV1::fgNTimeBins = 0;
eb38ed55 79AliRieman* AliTRDtrackerV1::fgRieman = 0x0;
80TLinearFitter* AliTRDtrackerV1::fgTiltedRieman = 0x0;
81TLinearFitter* AliTRDtrackerV1::fgTiltedRiemanConstrained = 0x0;
e4f2f73d 82
83//____________________________________________________________________
3a039a31 84AliTRDtrackerV1::AliTRDtrackerV1(AliTRDReconstructor *rec)
41702fec 85 :AliTracker()
06b32d95 86 ,fReconstructor(0x0)
eb2b4f91 87 ,fGeom(0x0)
41702fec 88 ,fClusters(0x0)
89 ,fTracklets(0x0)
90 ,fTracks(0x0)
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();
105 TGeoHMatrix *matrix = 0x0;
106 Double_t loc[] = {0., 0., 0.};
107 Double_t glb[] = {0., 0., 0.};
108 for(Int_t ily=kNPlanes; ily--;){
109 if(!(matrix = fGeom->GetClusterMatrix(AliTRDgeometry::GetDetector(ily, 2, 0)))){
110 AliFatal(Form("Could not get matrix for chamber @ 0 2 %d.", ily));
111 continue;
112 }
113 matrix->LocalToMaster(loc, glb);
114 fR[ily] = glb[0]+ AliTRDgeometry::AnodePos()-.5*AliTRDgeometry::AmThick() - AliTRDgeometry::DrThick();
115 }
116
117 // initialize calibration values
a7ac01d2 118 AliTRDcalibDB *trd = 0x0;
119 if (!(trd = AliTRDcalibDB::Instance())) {
eb2b4f91 120 AliFatal("Could not get calibration.");
41702fec 121 }
a7ac01d2 122 if(!fgNTimeBins) fgNTimeBins = trd->GetNumberOfTimeBins();
41702fec 123
eb2b4f91 124 // initialize cluster containers
053767a4 125 for (Int_t isector = 0; isector < AliTRDgeometry::kNsector; isector++) new(&fTrSec[isector]) AliTRDtrackingSector(fGeom, isector);
3a039a31 126
eb2b4f91 127 // initialize arrays
128 memset(fTrackQuality, 0, kMaxTracksStack*sizeof(Double_t));
129 memset(fSeedLayer, 0, kMaxTracksStack*sizeof(Int_t));
130 memset(fSeedTB, 0, kNSeedPlanes*sizeof(AliTRDchamberTimeBin*));
eb38ed55 131}
132
e4f2f73d 133//____________________________________________________________________
134AliTRDtrackerV1::~AliTRDtrackerV1()
135{
41702fec 136 //
137 // Destructor
138 //
139
f7ab3117 140 if(fgRieman) delete fgRieman; fgRieman = 0x0;
141 if(fgTiltedRieman) delete fgTiltedRieman; fgTiltedRieman = 0x0;
142 if(fgTiltedRiemanConstrained) delete fgTiltedRiemanConstrained; fgTiltedRiemanConstrained = 0x0;
d611c74f 143 for(Int_t isl =0; isl<kNSeedPlanes; isl++) if(fSeedTB[isl]) delete fSeedTB[isl];
41702fec 144 if(fTracks) {fTracks->Delete(); delete fTracks;}
145 if(fTracklets) {fTracklets->Delete(); delete fTracklets;}
48f8adf3 146 if(fClusters) {
147 fClusters->Delete(); delete fClusters;
148 }
41702fec 149 if(fGeom) delete fGeom;
e4f2f73d 150}
151
152//____________________________________________________________________
153Int_t AliTRDtrackerV1::Clusters2Tracks(AliESDEvent *esd)
154{
41702fec 155 //
156 // Steering stand alone tracking for full TRD detector
157 //
158 // Parameters :
159 // esd : The ESD event. On output it contains
160 // the ESD tracks found in TRD.
161 //
162 // Output :
163 // Number of tracks found in the TRD detector.
164 //
165 // Detailed description
166 // 1. Launch individual SM trackers.
167 // See AliTRDtrackerV1::Clusters2TracksSM() for details.
168 //
169
3a039a31 170 if(!fReconstructor->GetRecoParam() ){
171 AliError("Reconstruction configuration not initialized. Call first AliTRDReconstructor::SetRecoParam().");
41702fec 172 return 0;
173 }
174
175 //AliInfo("Start Track Finder ...");
176 Int_t ntracks = 0;
053767a4 177 for(int ism=0; ism<AliTRDgeometry::kNsector; ism++){
41702fec 178 // for(int ism=1; ism<2; ism++){
179 //AliInfo(Form("Processing supermodule %i ...", ism));
180 ntracks += Clusters2TracksSM(ism, esd);
181 }
182 AliInfo(Form("Number of found tracks : %d", ntracks));
183 return ntracks;
e4f2f73d 184}
185
0906e73e 186
187//_____________________________________________________________________________
eb38ed55 188Bool_t AliTRDtrackerV1::GetTrackPoint(Int_t index, AliTrackPoint &p) const
0906e73e 189{
41702fec 190 //AliInfo(Form("Asking for tracklet %d", index));
191
84eab75a 192 // reset position of the point before using it
193 p.SetXYZ(0., 0., 0.);
2f7514a6 194 AliTRDseedV1 *tracklet = GetTracklet(index);
195 if (!tracklet) return kFALSE;
84eab75a 196
41702fec 197 // get detector for this tracklet
84eab75a 198 Int_t idet = tracklet->GetDetector();
41702fec 199
200 Double_t local[3];
201 local[0] = tracklet->GetX0();
202 local[1] = tracklet->GetYfit(0);
203 local[2] = tracklet->GetZfit(0);
204 Double_t global[3];
205 fGeom->RotateBack(idet, local, global);
206 p.SetXYZ(global[0],global[1],global[2]);
207
208
209 // setting volume id
210 AliGeomManager::ELayerID iLayer = AliGeomManager::kTRD1;
053767a4 211 switch (fGeom->GetLayer(idet)) {
41702fec 212 case 0:
213 iLayer = AliGeomManager::kTRD1;
214 break;
215 case 1:
216 iLayer = AliGeomManager::kTRD2;
217 break;
218 case 2:
219 iLayer = AliGeomManager::kTRD3;
220 break;
221 case 3:
222 iLayer = AliGeomManager::kTRD4;
223 break;
224 case 4:
225 iLayer = AliGeomManager::kTRD5;
226 break;
227 case 5:
228 iLayer = AliGeomManager::kTRD6;
229 break;
230 };
053767a4 231 Int_t modId = fGeom->GetSector(idet) * fGeom->Nstack() + fGeom->GetStack(idet);
41702fec 232 UShort_t volid = AliGeomManager::LayerToVolUID(iLayer, modId);
233 p.SetVolumeID(volid);
234
235 return kTRUE;
0906e73e 236}
237
eb38ed55 238//____________________________________________________________________
239TLinearFitter* AliTRDtrackerV1::GetTiltedRiemanFitter()
240{
41702fec 241 if(!fgTiltedRieman) fgTiltedRieman = new TLinearFitter(4, "hyp4");
242 return fgTiltedRieman;
eb38ed55 243}
0906e73e 244
eb38ed55 245//____________________________________________________________________
246TLinearFitter* AliTRDtrackerV1::GetTiltedRiemanFitterConstraint()
247{
41702fec 248 if(!fgTiltedRiemanConstrained) fgTiltedRiemanConstrained = new TLinearFitter(2, "hyp2");
249 return fgTiltedRiemanConstrained;
eb38ed55 250}
41702fec 251
eb38ed55 252//____________________________________________________________________
253AliRieman* AliTRDtrackerV1::GetRiemanFitter()
254{
fac58f00 255 if(!fgRieman) fgRieman = new AliRieman(AliTRDseedV1::kNtb * AliTRDgeometry::kNlayer);
41702fec 256 return fgRieman;
eb38ed55 257}
41702fec 258
0906e73e 259//_____________________________________________________________________________
260Int_t AliTRDtrackerV1::PropagateBack(AliESDEvent *event)
261{
41702fec 262 //
263 // Gets seeds from ESD event. The seeds are AliTPCtrack's found and
264 // backpropagated by the TPC tracker. Each seed is first propagated
265 // to the TRD, and then its prolongation is searched in the TRD.
266 // If sufficiently long continuation of the track is found in the TRD
267 // the track is updated, otherwise it's stored as originaly defined
268 // by the TPC tracker.
269 //
270
271 // Calibration monitor
272 AliTRDCalibraFillHisto *calibra = AliTRDCalibraFillHisto::Instance();
273 if (!calibra) AliInfo("Could not get Calibra instance\n");
274
eb2b4f91 275 // Define scalers
276 Int_t nFound = 0, // number of tracks found
277 nSeeds = 0, // total number of ESD seeds
278 nTRDseeds= 0, // number of seeds in the TRD acceptance
279 nTPCseeds= 0; // number of TPC seeds
41702fec 280 Float_t foundMin = 20.0;
281
d611c74f 282 Float_t *quality = 0x0;
283 Int_t *index = 0x0;
eb2b4f91 284 nSeeds = event->GetNumberOfTracks();
285 // Sort tracks according to quality
286 // (covariance in the yz plane)
287 if(nSeeds){
288 quality = new Float_t[nSeeds];
289 index = new Int_t[nSeeds];
290 for (Int_t iSeed = nSeeds; iSeed--;) {
d611c74f 291 AliESDtrack *seed = event->GetTrack(iSeed);
292 Double_t covariance[15];
293 seed->GetExternalCovariance(covariance);
294 quality[iSeed] = covariance[0] + covariance[2];
295 }
eb2b4f91 296 TMath::Sort(nSeeds, quality, index,kFALSE);
41702fec 297 }
41702fec 298
eb2b4f91 299 // Propagate all seeds
41702fec 300 Int_t expectedClr;
301 AliTRDtrackV1 track;
eb2b4f91 302 for (Int_t iSeed = 0; iSeed < nSeeds; iSeed++) {
41702fec 303
304 // Get the seeds in sorted sequence
305 AliESDtrack *seed = event->GetTrack(index[iSeed]);
eb2b4f91 306 Float_t p4 = seed->GetC(seed->GetBz());
41702fec 307
308 // Check the seed status
309 ULong_t status = seed->GetStatus();
310 if ((status & AliESDtrack::kTPCout) == 0) continue;
311 if ((status & AliESDtrack::kTRDout) != 0) continue;
eb2b4f91 312
313 // Propagate to the entrance in the TRD mother volume
41702fec 314 new(&track) AliTRDtrackV1(*seed);
eb2b4f91 315 if(AliTRDgeometry::GetXtrdBeg() > (fgkMaxStep + track.GetX()) && !PropagateToX(track, AliTRDgeometry::GetXtrdBeg(), fgkMaxStep)){
316 seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
317 continue;
318 }
319 if(!AdjustSector(&track)){
320 seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
321 continue;
322 }
323 if(TMath::Abs(track.GetSnp()) > fgkMaxSnp) {
324 seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
325 continue;
326 }
327
328 nTPCseeds++;
e4d4864b 329
eb2b4f91 330 // store track status at TRD entrance
76b60503 331 seed->UpdateTrackParams(&track, AliESDtrack::kTRDbackup);
ae3fbe1f 332
eb2b4f91 333 // prepare track and do propagation in the TRD
334 track.SetReconstructor(fReconstructor);
335 track.SetKink(Bool_t(seed->GetKinkIndex(0)));
336 expectedClr = FollowBackProlongation(track);
337 // check if track entered the TRD fiducial volume
338 if(track.GetTrackLow()){
339 seed->UpdateTrackParams(&track, AliESDtrack::kTRDin);
340 nTRDseeds++;
341 }
342 // check if track was stopped in the TRD
343 if (expectedClr<0){
344 seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
345 continue;
346 }
ae3fbe1f 347
348 if(expectedClr){
eb2b4f91 349 nFound++;
41702fec 350 // computes PID for track
351 track.CookPID();
352 // update calibration references using this track
353 if(calibra->GetHisto2d()) calibra->UpdateHistogramsV1(&track);
354 // save calibration object
eb2b4f91 355 if (fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 0){
224f357f 356 AliTRDtrackV1 *calibTrack = new AliTRDtrackV1(track);
357 calibTrack->SetOwner();
358 seed->AddCalibObject(calibTrack);
359 }
360 //update ESD track
41702fec 361 if ((track.GetNumberOfClusters() > 15) && (track.GetNumberOfClusters() > 0.5*expectedClr)) {
2389e96f 362 seed->UpdateTrackParams(&track, AliESDtrack::kTRDout);
41702fec 363 track.UpdateESDtrack(seed);
41702fec 364 }
365 }
366
27fbeba8 367 if ((TMath::Abs(track.GetC(track.GetBz()) - p4) / TMath::Abs(p4) < 0.2) ||(track.Pt() > 0.8)) {
e3cf3d02 368
41702fec 369 // Make backup for back propagation
41702fec 370 Int_t foundClr = track.GetNumberOfClusters();
371 if (foundClr >= foundMin) {
41702fec 372 track.CookLabel(1. - fgkLabelFraction);
f29f13a6 373 //if(track.GetBackupTrack()) UseClusters(track.GetBackupTrack());
41702fec 374
375 // Sign only gold tracks
376 if (track.GetChi2() / track.GetNumberOfClusters() < 4) {
f29f13a6 377 //if ((seed->GetKinkIndex(0) == 0) && (track.Pt() < 1.5)) UseClusters(&track);
41702fec 378 }
379 Bool_t isGold = kFALSE;
380
381 // Full gold track
382 if (track.GetChi2() / track.GetNumberOfClusters() < 5) {
383 if (track.GetBackupTrack()) seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup);
384
385 isGold = kTRUE;
386 }
387
388 // Almost gold track
389 if ((!isGold) && (track.GetNCross() == 0) && (track.GetChi2() / track.GetNumberOfClusters() < 7)) {
390 //seed->UpdateTrackParams(track, AliESDtrack::kTRDbackup);
391 if (track.GetBackupTrack()) seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup);
392
393 isGold = kTRUE;
394 }
395
396 if ((!isGold) && (track.GetBackupTrack())) {
397 if ((track.GetBackupTrack()->GetNumberOfClusters() > foundMin) && ((track.GetBackupTrack()->GetChi2()/(track.GetBackupTrack()->GetNumberOfClusters()+1)) < 7)) {
398 seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup);
399 isGold = kTRUE;
400 }
401 }
41702fec 402 }
403 }
404
eb2b4f91 405 // Propagation to the TOF
406 if(!(seed->GetStatus()&AliESDtrack::kTRDStop)) {
407 Int_t sm = track.GetSector();
408 // default value in case we have problems with the geometry.
409 Double_t xtof = 371.;
410 //Calculate radial position of the beginning of the TOF
411 //mother volume. In order to avoid mixing of the TRD
412 //and TOF modules some hard values are needed. This are:
413 //1. The path to the TOF module.
414 //2. The width of the TOF (29.05 cm)
415 //(with the help of Annalisa de Caro Mar-17-2009)
416 if(gGeoManager){
417 gGeoManager->cd(Form("/ALIC_1/B077_1/BSEGMO%d_1/BTOF%d_1", sm, sm));
418 TGeoHMatrix *m = 0x0;
419 Double_t loc[]={0., 0., -.5*29.05}, glob[3];
420
421 if((m=gGeoManager->GetCurrentMatrix())){
422 m->LocalToMaster(loc, glob);
423 xtof = TMath::Sqrt(glob[0]*glob[0]+glob[1]*glob[1]);
424 }
41702fec 425 }
672b48bd 426 if(xtof > (fgkMaxStep + track.GetX()) && !PropagateToX(track, xtof, fgkMaxStep)){
427 seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
428 continue;
429 }
430 if(!AdjustSector(&track)){
431 seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
432 continue;
433 }
434 if(TMath::Abs(track.GetSnp()) > fgkMaxSnp){
435 seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
436 continue;
437 }
eb2b4f91 438 seed->UpdateTrackParams(&track, AliESDtrack::kTRDout);
439 // TODO obsolete - delete
440 seed->SetTRDQuality(track.StatusForTOF());
41702fec 441 }
41702fec 442 seed->SetTRDBudget(track.GetBudget(0));
443 }
d611c74f 444 if(index) delete [] index;
445 if(quality) delete [] quality;
41702fec 446
447
eb2b4f91 448 AliInfo(Form("Number of TPC seeds: %d (%d)", nTRDseeds, nTPCseeds));
449 AliInfo(Form("Number of propagated TRD tracks: %d", nFound));
41702fec 450
d611c74f 451 // run stand alone tracking
3a039a31 452 if (fReconstructor->IsSeeding()) Clusters2Tracks(event);
41702fec 453
454 return 0;
0906e73e 455}
456
457
458//____________________________________________________________________
459Int_t AliTRDtrackerV1::RefitInward(AliESDEvent *event)
460{
41702fec 461 //
462 // Refits tracks within the TRD. The ESD event is expected to contain seeds
463 // at the outer part of the TRD.
464 // The tracks are propagated to the innermost time bin
465 // of the TRD and the ESD event is updated
466 // Origin: Thomas KUHR (Thomas.Kuhr@cern.ch)
467 //
468
469 Int_t nseed = 0; // contor for loaded seeds
470 Int_t found = 0; // contor for updated TRD tracks
471
472
473 AliTRDtrackV1 track;
474 for (Int_t itrack = 0; itrack < event->GetNumberOfTracks(); itrack++) {
475 AliESDtrack *seed = event->GetTrack(itrack);
476 new(&track) AliTRDtrackV1(*seed);
477
478 if (track.GetX() < 270.0) {
479 seed->UpdateTrackParams(&track, AliESDtrack::kTRDbackup);
480 continue;
481 }
482
e3cf3d02 483 // reject tracks which failed propagation in the TRD or
484 // are produced by the TRD stand alone tracker
41702fec 485 ULong_t status = seed->GetStatus();
e3cf3d02 486 if(!(status & AliESDtrack::kTRDout)) continue;
487 if(!(status & AliESDtrack::kTRDin)) continue;
41702fec 488 nseed++;
489
490 track.ResetCovariance(50.0);
491
492 // do the propagation and processing
493 Bool_t kUPDATE = kFALSE;
494 Double_t xTPC = 250.0;
495 if(FollowProlongation(track)){
496 // Prolongate to TPC
497 if (PropagateToX(track, xTPC, fgkMaxStep)) { // -with update
e3cf3d02 498 seed->UpdateTrackParams(&track, AliESDtrack::kTRDrefit);
499 found++;
500 kUPDATE = kTRUE;
501 }
502
503 // Update the friend track
504 if (fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 0){
505 TObject *o = 0x0; Int_t ic = 0;
506 AliTRDtrackV1 *calibTrack = 0x0;
507 while((o = seed->GetCalibObject(ic++))){
508 if(!(calibTrack = dynamic_cast<AliTRDtrackV1*>(o))) continue;
509 calibTrack->SetTrackHigh(track.GetTrackHigh());
510 }
41702fec 511 }
e3cf3d02 512 }
41702fec 513
514 // Prolongate to TPC without update
515 if(!kUPDATE) {
516 AliTRDtrackV1 tt(*seed);
e3cf3d02 517 if (PropagateToX(tt, xTPC, fgkMaxStep)) seed->UpdateTrackParams(&tt, AliESDtrack::kTRDbackup);
41702fec 518 }
519 }
520 AliInfo(Form("Number of loaded seeds: %d",nseed));
521 AliInfo(Form("Number of found tracks from loaded seeds: %d",found));
522
523 return 0;
0906e73e 524}
525
0906e73e 526//____________________________________________________________________
527Int_t AliTRDtrackerV1::FollowProlongation(AliTRDtrackV1 &t)
528{
41702fec 529 // Extrapolates the TRD track in the TPC direction.
530 //
531 // Parameters
532 // t : the TRD track which has to be extrapolated
533 //
534 // Output
535 // number of clusters attached to the track
536 //
537 // Detailed description
538 //
539 // Starting from current radial position of track <t> this function
540 // extrapolates the track through the 6 TRD layers. The following steps
541 // are being performed for each plane:
542 // 1. prepare track:
543 // a. get plane limits in the local x direction
544 // b. check crossing sectors
545 // c. check track inclination
546 // 2. search tracklet in the tracker list (see GetTracklet() for details)
547 // 3. evaluate material budget using the geo manager
548 // 4. propagate and update track using the tracklet information.
549 //
550 // Debug level 2
551 //
552
e3cf3d02 553 Bool_t kStoreIn = kTRUE;
41702fec 554 Int_t nClustersExpected = 0;
e3cf3d02 555 for (Int_t iplane = kNPlanes; iplane--;) {
41702fec 556 Int_t index = 0;
557 AliTRDseedV1 *tracklet = GetTracklet(&t, iplane, index);
558 if(!tracklet) continue;
559 if(!tracklet->IsOK()) AliWarning("tracklet not OK");
560
e3cf3d02 561 Double_t x = tracklet->GetX();//GetX0();
41702fec 562 // reject tracklets which are not considered for inward refit
563 if(x > t.GetX()+fgkMaxStep) continue;
564
565 // append tracklet to track
566 t.SetTracklet(tracklet, index);
567
568 if (x < (t.GetX()-fgkMaxStep) && !PropagateToX(t, x+fgkMaxStep, fgkMaxStep)) break;
569 if (!AdjustSector(&t)) break;
570
571 // Start global position
572 Double_t xyz0[3];
573 t.GetXYZ(xyz0);
574
575 // End global position
576 Double_t alpha = t.GetAlpha(), y, z;
577 if (!t.GetProlongation(x,y,z)) break;
578 Double_t xyz1[3];
579 xyz1[0] = x * TMath::Cos(alpha) - y * TMath::Sin(alpha);
580 xyz1[1] = x * TMath::Sin(alpha) + y * TMath::Cos(alpha);
581 xyz1[2] = z;
582
51a23065 583 Double_t length = TMath::Sqrt(
584 (xyz0[0]-xyz1[0])*(xyz0[0]-xyz1[0]) +
585 (xyz0[1]-xyz1[1])*(xyz0[1]-xyz1[1]) +
586 (xyz0[2]-xyz1[2])*(xyz0[2]-xyz1[2])
587 );
588 if(length>0.){
589 // Get material budget
590 Double_t param[7];
591 if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param)<=0.) break;
592 Double_t xrho= param[0]*param[4];
593 Double_t xx0 = param[1]; // Get mean propagation parameters
594
595 // Propagate and update
596 t.PropagateTo(x, xx0, xrho);
597 if (!AdjustSector(&t)) break;
598 }
e3cf3d02 599 if(kStoreIn){
600 t.SetTrackHigh();
601 kStoreIn = kFALSE;
602 }
603
41702fec 604 Double_t maxChi2 = t.GetPredictedChi2(tracklet);
605 if (maxChi2 < 1e+10 && t.Update(tracklet, maxChi2)){
606 nClustersExpected += tracklet->GetN();
607 }
608 }
609
3a039a31 610 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){
41702fec 611 Int_t index;
51a23065 612 for(int iplane=0; iplane<AliTRDgeometry::kNlayer; iplane++){
41702fec 613 AliTRDseedV1 *tracklet = GetTracklet(&t, iplane, index);
614 if(!tracklet) continue;
615 t.SetTracklet(tracklet, index);
616 }
617
618 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
29f95561 619 TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
eb2b4f91 620 AliTRDtrackV1 track(t);
621 track.SetOwner();
41702fec 622 cstreamer << "FollowProlongation"
623 << "EventNumber=" << eventNumber
624 << "ncl=" << nClustersExpected
eb2b4f91 625 << "track.=" << &track
41702fec 626 << "\n";
627 }
628
629 return nClustersExpected;
0906e73e 630
631}
632
633//_____________________________________________________________________________
634Int_t AliTRDtrackerV1::FollowBackProlongation(AliTRDtrackV1 &t)
635{
41702fec 636 // Extrapolates the TRD track in the TOF direction.
637 //
638 // Parameters
639 // t : the TRD track which has to be extrapolated
640 //
641 // Output
642 // number of clusters attached to the track
643 //
644 // Detailed description
645 //
646 // Starting from current radial position of track <t> this function
647 // extrapolates the track through the 6 TRD layers. The following steps
648 // are being performed for each plane:
649 // 1. prepare track:
650 // a. get plane limits in the local x direction
651 // b. check crossing sectors
652 // c. check track inclination
653 // 2. build tracklet (see AliTRDseed::AttachClusters() for details)
654 // 3. evaluate material budget using the geo manager
655 // 4. propagate and update track using the tracklet information.
656 //
657 // Debug level 2
658 //
659
eb2b4f91 660 Int_t n = 0;
661 Double_t driftLength = .5*AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick();
41702fec 662 AliTRDtrackingChamber *chamber = 0x0;
663
3b57a3f7 664 AliTRDseedV1 tracklet, *ptrTracklet = 0x0;
181d2c97 665 // in case of stand alone tracking we store all the pointers to the tracklets in a temporary array
666 AliTRDseedV1 *tracklets[kNPlanes];
667 memset(tracklets, 0, sizeof(AliTRDseedV1 *) * kNPlanes);
668 for(Int_t ip = 0; ip < kNPlanes; ip++){
669 tracklets[ip] = t.GetTracklet(ip);
670 t.UnsetTracklet(ip);
671 }
e3cf3d02 672 Bool_t kStoreIn = kTRUE;
673
053767a4 674 // Loop through the TRD layers
eb2b4f91 675 TGeoHMatrix *matrix = 0x0;
676 Double_t x, y, z;
677 for (Int_t ily=0, sm=-1, stk=-1, det=-1; ily < AliTRDgeometry::kNlayer; ily++) {
678 // rough estimate of the entry point
679 if (!t.GetProlongation(fR[ily], y, z)){
680 n=-1;
681 t.SetStatus(AliTRDtrackV1::kProlongation);
682 break;
683 }
41702fec 684
eb2b4f91 685 // find sector / stack / detector
686 sm = t.GetSector();
687 // TODO cross check with y value !
688 stk = fGeom->GetStack(z, ily);
689 det = stk>=0 ? AliTRDgeometry::GetDetector(ily, stk, sm) : -1;
690 matrix = det>=0 ? fGeom->GetClusterMatrix(det) : 0x0;
691
692 // check if supermodule/chamber is installed
693 if( !fGeom->GetSMstatus(sm) ||
694 stk<0. ||
695 fGeom->IsHole(ily, stk, sm) ||
696 !matrix ){
697 // propagate to the default radial position
698 if(fR[ily] > (fgkMaxStep + t.GetX()) && !PropagateToX(t, fR[ily], fgkMaxStep)){
699 n=-1;
700 t.SetStatus(AliTRDtrackV1::kPropagation);
41702fec 701 break;
702 }
eb2b4f91 703 if(!AdjustSector(&t)){
704 n=-1;
705 t.SetStatus(AliTRDtrackV1::kAdjustSector);
706 break;
707 }
708 if(TMath::Abs(t.GetSnp()) > fgkMaxSnp){
709 n=-1;
710 t.SetStatus(AliTRDtrackV1::kSnp);
711 break;
712 }
713 t.SetStatus(AliTRDtrackV1::kGeometry, ily);
41702fec 714 continue;
715 }
e3cf3d02 716
eb2b4f91 717 // retrieve rotation matrix for the current chamber
718 Double_t loc[] = {AliTRDgeometry::AnodePos()- driftLength, 0., 0.};
719 Double_t glb[] = {0., 0., 0.};
720 matrix->LocalToMaster(loc, glb);
721
722 // Propagate to the radial distance of the current layer
723 x = glb[0] - fgkMaxStep;
724 if(x > (fgkMaxStep + t.GetX()) && !PropagateToX(t, x, fgkMaxStep)){
725 n=-1;
726 t.SetStatus(AliTRDtrackV1::kPropagation);
727 break;
728 }
729 if(!AdjustSector(&t)){
730 n=-1;
731 t.SetStatus(AliTRDtrackV1::kAdjustSector);
732 break;
733 }
734 if(TMath::Abs(t.GetSnp()) > fgkMaxSnp) {
735 n=-1;
736 t.SetStatus(AliTRDtrackV1::kSnp);
737 break;
738 }
739 Bool_t RECALCULATE = kFALSE;
740 if(sm != t.GetSector()){
741 sm = t.GetSector();
742 RECALCULATE = kTRUE;
743 }
744 if(stk != fGeom->GetStack(z, ily)){
745 stk = fGeom->GetStack(z, ily);
746 RECALCULATE = kTRUE;
747 }
748 if(RECALCULATE){
749 det = AliTRDgeometry::GetDetector(ily, stk, sm);
750 if(!(matrix = fGeom->GetClusterMatrix(det))){
751 t.SetStatus(AliTRDtrackV1::kGeometry, ily);
752 continue;
753 }
754 matrix->LocalToMaster(loc, glb);
755 x = glb[0] - fgkMaxStep;
756 }
757
758 // check if track is well inside fiducial volume
759 if (!t.GetProlongation(x+fgkMaxStep, y, z)) {
760 n=-1;
761 t.SetStatus(AliTRDtrackV1::kProlongation);
762 break;
763 }
764 if(fGeom->IsOnBoundary(det, y, z, .5)){
765 t.SetStatus(AliTRDtrackV1::kBoundary, ily);
766 continue;
767 }
768 // mark track as entering the FIDUCIAL volume of TRD
e3cf3d02 769 if(kStoreIn){
770 t.SetTrackLow();
771 kStoreIn = kFALSE;
772 }
b1957d3c 773
eb2b4f91 774 ptrTracklet = tracklets[ily];
775 if(!ptrTracklet){ // BUILD TRACKLET
776 // check data in supermodule
777 if(!fTrSec[sm].GetNChambers()){
778 t.SetStatus(AliTRDtrackV1::kNoClusters, ily);
779 continue;
780 }
781 if(fTrSec[sm].GetX(ily) < 1.){
782 t.SetStatus(AliTRDtrackV1::kNoClusters, ily);
783 continue;
784 }
785
786 // check data in chamber
787 if(!(chamber = fTrSec[sm].GetChamber(stk, ily))){
788 t.SetStatus(AliTRDtrackV1::kNoClusters, ily);
789 continue;
790 }
791 if(chamber->GetNClusters() < fgNTimeBins*fReconstructor->GetRecoParam() ->GetFindableClusters()){
792 t.SetStatus(AliTRDtrackV1::kNoClusters, ily);
793 continue;
794 }
795 // build tracklet
796 ptrTracklet = new(&tracklet) AliTRDseedV1(det);
797 ptrTracklet->SetReconstructor(fReconstructor);
798 ptrTracklet->SetKink(t.IsKink());
799 ptrTracklet->SetPadPlane(fGeom->GetPadPlane(ily, stk));
800 ptrTracklet->SetX0(glb[0]+driftLength);
801 if(!tracklet.Init(&t)){
802 n=-1;
803 t.SetStatus(AliTRDtrackV1::kTrackletInit);
804 break;
805 }
806 if(!tracklet.AttachClusters(chamber, kTRUE)){
807 t.SetStatus(AliTRDtrackV1::kNoAttach, ily);
808 continue;
809 }
810 if(tracklet.GetN() < fgNTimeBins*fReconstructor->GetRecoParam() ->GetFindableClusters()){
811 t.SetStatus(AliTRDtrackV1::kNoClustersTracklet, ily);
812 continue;
813 }
814 ptrTracklet->UpdateUsed();
815 }
816
817 // propagate track to the radial position of the tracklet
818 ptrTracklet->UseClusters(); // TODO ? do we need this here ?
819 // fit tracklet no tilt correction
820 if(!ptrTracklet->Fit(kFALSE)){
821 t.SetStatus(AliTRDtrackV1::kNoFit, ily);
822 continue;
823 }
824 x = ptrTracklet->GetX(); //GetX0();
825 if(x > (fgkMaxStep + t.GetX()) && !PropagateToX(t, x, fgkMaxStep)) {
826 n=-1;
827 t.SetStatus(AliTRDtrackV1::kPropagation);
828 break;
829 }
830 if(!AdjustSector(&t)) {
831 n=-1;
832 t.SetStatus(AliTRDtrackV1::kAdjustSector);
833 break;
41702fec 834 }
eb2b4f91 835 if(TMath::Abs(t.GetSnp()) > fgkMaxSnp) {
836 n=-1;
837 t.SetStatus(AliTRDtrackV1::kSnp);
838 break;
839 }
840
841 // update Kalman with the TRD measurement
842 Double_t chi2 = t.GetPredictedChi2(ptrTracklet);
843 if(chi2>1e+10){
844 t.SetStatus(AliTRDtrackV1::kChi2, ily);
845 continue;
846 }
847 if(!t.Update(ptrTracklet, chi2)) {
848 n=-1;
849 t.SetStatus(AliTRDtrackV1::kUpdate);
850 break;
851 }
852
853 // load tracklet to the tracker
854 ptrTracklet->UpDate(&t);
855 ptrTracklet = SetTracklet(ptrTracklet);
856 t.SetTracklet(ptrTracklet, fTracklets->GetEntriesFast()-1);
857 n += ptrTracklet->GetN();
858
41702fec 859 // Reset material budget if 2 consecutive gold
eb2b4f91 860// if(ilayer>0 && t.GetTracklet(ilayer-1) && ptrTracklet->GetN() + t.GetTracklet(ilayer-1)->GetN() > 20) t.SetBudget(2, 0.);
41702fec 861
862 // Make backup of the track until is gold
863 // TO DO update quality check of the track.
864 // consider comparison with fTimeBinsRange
865 Float_t ratio0 = ptrTracklet->GetN() / Float_t(fgNTimeBins);
866 //Float_t ratio1 = Float_t(t.GetNumberOfClusters()+1) / Float_t(t.GetNExpected()+1);
41702fec 867
eb2b4f91 868 if( (chi2 < 18.0) &&
41702fec 869 (ratio0 > 0.8) &&
870 //(ratio1 > 0.6) &&
871 //(ratio0+ratio1 > 1.5) &&
872 (t.GetNCross() == 0) &&
873 (TMath::Abs(t.GetSnp()) < 0.85) &&
e3cf3d02 874 (t.GetNumberOfClusters() > 20)){
875 t.MakeBackupTrack();
876 }
053767a4 877 } // end layers loop
eb2b4f91 878 //printf("clusters[%d] chi2[%f] x[%f] status[%d ", n, t.GetChi2(), t.GetX(), t.GetStatusTRD());
879 //for(int i=0; i<6; i++) printf("%d ", t.GetStatusTRD(i)); printf("]\n");
41702fec 880
3a039a31 881 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){
29f95561 882 TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
41702fec 883 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
eb2b4f91 884 AliTRDtrackV1 track(t);
885 track.SetOwner();
41702fec 886 cstreamer << "FollowBackProlongation"
eb2b4f91 887 << "EventNumber=" << eventNumber
888 << "ncl=" << n
889 << "track.=" << &track
41702fec 890 << "\n";
891 }
892
eb2b4f91 893 return n;
0906e73e 894}
895
eb38ed55 896//_________________________________________________________________________
897Float_t AliTRDtrackerV1::FitRieman(AliTRDseedV1 *tracklets, Double_t *chi2, Int_t *planes){
41702fec 898 //
899 // Fits a Riemann-circle to the given points without tilting pad correction.
900 // The fit is performed using an instance of the class AliRieman (equations
901 // and transformations see documentation of this class)
902 // Afterwards all the tracklets are Updated
903 //
904 // Parameters: - Array of tracklets (AliTRDseedV1)
905 // - Storage for the chi2 values (beginning with direction z)
906 // - Seeding configuration
907 // Output: - The curvature
908 //
909 AliRieman *fitter = AliTRDtrackerV1::GetRiemanFitter();
910 fitter->Reset();
911 Int_t allplanes[] = {0, 1, 2, 3, 4, 5};
912 Int_t *ppl = &allplanes[0];
913 Int_t maxLayers = 6;
914 if(planes){
915 maxLayers = 4;
916 ppl = planes;
917 }
918 for(Int_t il = 0; il < maxLayers; il++){
919 if(!tracklets[ppl[il]].IsOK()) continue;
e3cf3d02 920 fitter->AddPoint(tracklets[ppl[il]].GetX0(), tracklets[ppl[il]].GetYfit(0), tracklets[ppl[il]].GetZfit(0),1,10);
41702fec 921 }
922 fitter->Update();
923 // Set the reference position of the fit and calculate the chi2 values
924 memset(chi2, 0, sizeof(Double_t) * 2);
925 for(Int_t il = 0; il < maxLayers; il++){
926 // Reference positions
927 tracklets[ppl[il]].Init(fitter);
928
929 // chi2
930 if((!tracklets[ppl[il]].IsOK()) && (!planes)) continue;
931 chi2[0] += tracklets[ppl[il]].GetChi2Y();
932 chi2[1] += tracklets[ppl[il]].GetChi2Z();
933 }
934 return fitter->GetC();
eb38ed55 935}
936
937//_________________________________________________________________________
938void AliTRDtrackerV1::FitRieman(AliTRDcluster **seedcl, Double_t chi2[2])
939{
41702fec 940 //
941 // Performs a Riemann helix fit using the seedclusters as spacepoints
942 // Afterwards the chi2 values are calculated and the seeds are updated
943 //
944 // Parameters: - The four seedclusters
945 // - The tracklet array (AliTRDseedV1)
946 // - The seeding configuration
947 // - Chi2 array
948 //
949 // debug level 2
950 //
951 AliRieman *fitter = AliTRDtrackerV1::GetRiemanFitter();
952 fitter->Reset();
953 for(Int_t i = 0; i < 4; i++)
954 fitter->AddPoint(seedcl[i]->GetX(), seedcl[i]->GetY(), seedcl[i]->GetZ(), 1, 10);
955 fitter->Update();
956
957
958 // Update the seed and calculated the chi2 value
959 chi2[0] = 0; chi2[1] = 0;
960 for(Int_t ipl = 0; ipl < kNSeedPlanes; ipl++){
961 // chi2
962 chi2[0] += (seedcl[ipl]->GetZ() - fitter->GetZat(seedcl[ipl]->GetX())) * (seedcl[ipl]->GetZ() - fitter->GetZat(seedcl[ipl]->GetX()));
963 chi2[1] += (seedcl[ipl]->GetY() - fitter->GetYat(seedcl[ipl]->GetX())) * (seedcl[ipl]->GetY() - fitter->GetYat(seedcl[ipl]->GetX()));
964 }
eb38ed55 965}
966
967
968//_________________________________________________________________________
969Float_t AliTRDtrackerV1::FitTiltedRiemanConstraint(AliTRDseedV1 *tracklets, Double_t zVertex)
970{
41702fec 971 //
972 // Fits a helix to the clusters. Pad tilting is considered. As constraint it is
973 // assumed that the vertex position is set to 0.
974 // This method is very usefull for high-pt particles
975 // Basis for the fit: (x - x0)^2 + (y - y0)^2 - R^2 = 0
976 // x0, y0: Center of the circle
977 // Measured y-position: ymeas = y - tan(phiT)(zc - zt)
978 // zc: center of the pad row
979 // Equation which has to be fitted (after transformation):
980 // a + b * u + e * v + 2*(ymeas + tan(phiT)(z - zVertex))*t = 0
981 // Transformation:
982 // t = 1/(x^2 + y^2)
983 // u = 2 * x * t
984 // v = 2 * x * tan(phiT) * t
985 // Parameters in the equation:
986 // a = -1/y0, b = x0/y0, e = dz/dx
987 //
988 // The Curvature is calculated by the following equation:
989 // - curv = a/Sqrt(b^2 + 1) = 1/R
990 // Parameters: - the 6 tracklets
991 // - the Vertex constraint
992 // Output: - the Chi2 value of the track
993 //
994 // debug level 5
995 //
996
997 TLinearFitter *fitter = GetTiltedRiemanFitterConstraint();
998 fitter->StoreData(kTRUE);
999 fitter->ClearPoints();
1000 AliTRDcluster *cl = 0x0;
1001
1002 Float_t x, y, z, w, t, error, tilt;
1003 Double_t uvt[2];
1004 Int_t nPoints = 0;
053767a4 1005 for(Int_t ilr = 0; ilr < AliTRDgeometry::kNlayer; ilr++){
1006 if(!tracklets[ilr].IsOK()) continue;
8d2bec9e 1007 for(Int_t itb = 0; itb < AliTRDseedV1::kNclusters; itb++){
053767a4 1008 if(!tracklets[ilr].IsUsable(itb)) continue;
1009 cl = tracklets[ilr].GetClusters(itb);
41702fec 1010 x = cl->GetX();
1011 y = cl->GetY();
1012 z = cl->GetZ();
053767a4 1013 tilt = tracklets[ilr].GetTilt();
41702fec 1014 // Transformation
1015 t = 1./(x * x + y * y);
1016 uvt[0] = 2. * x * t;
1017 uvt[1] = 2. * x * t * tilt ;
1018 w = 2. * (y + tilt * (z - zVertex)) * t;
f29f13a6 1019 error = 2. * TMath::Sqrt(cl->GetSigmaY2()) * t;
41702fec 1020 fitter->AddPoint(uvt, w, error);
1021 nPoints++;
1022 }
1023 }
1024 fitter->Eval();
1025
1026 // Calculate curvature
1027 Double_t a = fitter->GetParameter(0);
1028 Double_t b = fitter->GetParameter(1);
1029 Double_t curvature = a/TMath::Sqrt(b*b + 1);
1030
1031 Float_t chi2track = fitter->GetChisquare()/Double_t(nPoints);
1032 for(Int_t ip = 0; ip < AliTRDtrackerV1::kNPlanes; ip++)
e3cf3d02 1033 tracklets[ip].SetC(curvature);
41702fec 1034
3a039a31 1035/* if(fReconstructor->GetStreamLevel() >= 5){
41702fec 1036 //Linear Model on z-direction
1037 Double_t xref = CalculateReferenceX(tracklets); // Relative to the middle of the stack
1038 Double_t slope = fitter->GetParameter(2);
1039 Double_t zref = slope * xref;
1040 Float_t chi2Z = CalculateChi2Z(tracklets, zref, slope, xref);
1041 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
1042 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
29f95561 1043 TTreeSRedirector &treeStreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
41702fec 1044 treeStreamer << "FitTiltedRiemanConstraint"
1045 << "EventNumber=" << eventNumber
1046 << "CandidateNumber=" << candidateNumber
1047 << "Curvature=" << curvature
1048 << "Chi2Track=" << chi2track
1049 << "Chi2Z=" << chi2Z
1050 << "zref=" << zref
1051 << "\n";
3a039a31 1052 }*/
41702fec 1053 return chi2track;
eb38ed55 1054}
1055
1056//_________________________________________________________________________
1057Float_t AliTRDtrackerV1::FitTiltedRieman(AliTRDseedV1 *tracklets, Bool_t sigError)
1058{
41702fec 1059 //
1060 // Performs a Riemann fit taking tilting pad correction into account
1061 // The equation of a Riemann circle, where the y position is substituted by the
1062 // measured y-position taking pad tilting into account, has to be transformed
1063 // into a 4-dimensional hyperplane equation
1064 // Riemann circle: (x-x0)^2 + (y-y0)^2 -R^2 = 0
1065 // Measured y-Position: ymeas = y - tan(phiT)(zc - zt)
1066 // zc: center of the pad row
1067 // zt: z-position of the track
1068 // The z-position of the track is assumed to be linear dependent on the x-position
1069 // Transformed equation: a + b * u + c * t + d * v + e * w - 2 * (ymeas + tan(phiT) * zc) * t = 0
1070 // Transformation: u = 2 * x * t
1071 // v = 2 * tan(phiT) * t
1072 // w = 2 * tan(phiT) * (x - xref) * t
1073 // t = 1 / (x^2 + ymeas^2)
1074 // Parameters: a = -1/y0
1075 // b = x0/y0
1076 // c = (R^2 -x0^2 - y0^2)/y0
1077 // d = offset
1078 // e = dz/dx
1079 // If the offset respectively the slope in z-position is impossible, the parameters are fixed using
1080 // results from the simple riemann fit. Afterwards the fit is redone.
1081 // The curvature is calculated according to the formula:
1082 // curv = a/(1 + b^2 + c*a) = 1/R
1083 //
1084 // Paramters: - Array of tracklets (connected to the track candidate)
1085 // - Flag selecting the error definition
1086 // Output: - Chi2 values of the track (in Parameter list)
1087 //
1088 TLinearFitter *fitter = GetTiltedRiemanFitter();
1089 fitter->StoreData(kTRUE);
1090 fitter->ClearPoints();
1091 AliTRDLeastSquare zfitter;
1092 AliTRDcluster *cl = 0x0;
1093
1094 Double_t xref = CalculateReferenceX(tracklets);
1095 Double_t x, y, z, t, tilt, dx, w, we;
1096 Double_t uvt[4];
1097 Int_t nPoints = 0;
1098 // Containers for Least-square fitter
1099 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1100 if(!tracklets[ipl].IsOK()) continue;
ed15ef4f 1101 tilt = tracklets[ipl].GetTilt();
8d2bec9e 1102 for(Int_t itb = 0; itb < AliTRDseedV1::kNclusters; itb++){
41702fec 1103 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1104 if (!tracklets[ipl].IsUsable(itb)) continue;
1105 x = cl->GetX();
1106 y = cl->GetY();
1107 z = cl->GetZ();
41702fec 1108 dx = x - xref;
1109 // Transformation
1110 t = 1./(x*x + y*y);
1111 uvt[0] = 2. * x * t;
1112 uvt[1] = t;
1113 uvt[2] = 2. * tilt * t;
1114 uvt[3] = 2. * tilt * dx * t;
1115 w = 2. * (y + tilt*z) * t;
1116 // error definition changes for the different calls
1117 we = 2. * t;
f29f13a6 1118 we *= sigError ? TMath::Sqrt(cl->GetSigmaY2()) : 0.2;
41702fec 1119 fitter->AddPoint(uvt, w, we);
1120 zfitter.AddPoint(&x, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
1121 nPoints++;
1122 }
1123 }
1124 fitter->Eval();
1125 zfitter.Eval();
1126
1127 Double_t offset = fitter->GetParameter(3);
1128 Double_t slope = fitter->GetParameter(4);
1129
1130 // Linear fitter - not possible to make boundaries
1131 // Do not accept non possible z and dzdx combinations
1132 Bool_t acceptablez = kTRUE;
1133 Double_t zref = 0.0;
1134 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
1135 if(!tracklets[iLayer].IsOK()) continue;
1136 zref = offset + slope * (tracklets[iLayer].GetX0() - xref);
e3cf3d02 1137 if (TMath::Abs(tracklets[iLayer].GetZfit(0) - zref) > tracklets[iLayer].GetPadLength() * 0.5 + 1.0)
41702fec 1138 acceptablez = kFALSE;
1139 }
1140 if (!acceptablez) {
1141 Double_t dzmf = zfitter.GetFunctionParameter(1);
1142 Double_t zmf = zfitter.GetFunctionValue(&xref);
1143 fgTiltedRieman->FixParameter(3, zmf);
1144 fgTiltedRieman->FixParameter(4, dzmf);
1145 fitter->Eval();
1146 fitter->ReleaseParameter(3);
1147 fitter->ReleaseParameter(4);
1148 offset = fitter->GetParameter(3);
1149 slope = fitter->GetParameter(4);
1150 }
1151
1152 // Calculate Curvarture
1153 Double_t a = fitter->GetParameter(0);
1154 Double_t b = fitter->GetParameter(1);
1155 Double_t c = fitter->GetParameter(2);
1156 Double_t curvature = 1.0 + b*b - c*a;
1157 if (curvature > 0.0)
1158 curvature = a / TMath::Sqrt(curvature);
1159
1160 Double_t chi2track = fitter->GetChisquare()/Double_t(nPoints);
1161
1162 // Update the tracklets
1163 Double_t dy, dz;
1164 for(Int_t iLayer = 0; iLayer < AliTRDtrackerV1::kNPlanes; iLayer++) {
1165
1166 x = tracklets[iLayer].GetX0();
1167 y = 0;
1168 z = 0;
1169 dy = 0;
1170 dz = 0;
1171
1172 // y: R^2 = (x - x0)^2 + (y - y0)^2
1173 // => y = y0 +/- Sqrt(R^2 - (x - x0)^2)
1174 // R = Sqrt() = 1/Curvature
1175 // => y = y0 +/- Sqrt(1/Curvature^2 - (x - x0)^2)
1176 Double_t res = (x * a + b); // = (x - x0)/y0
1177 res *= res;
1178 res = 1.0 - c * a + b * b - res; // = (R^2 - (x - x0)^2)/y0^2
1179 if (res >= 0) {
1180 res = TMath::Sqrt(res);
1181 y = (1.0 - res) / a;
1182 }
1183
1184 // dy: R^2 = (x - x0)^2 + (y - y0)^2
1185 // => y = +/- Sqrt(R^2 - (x - x0)^2) + y0
1186 // => dy/dx = (x - x0)/Sqrt(R^2 - (x - x0)^2)
1187 // Curvature: cr = 1/R = a/Sqrt(1 + b^2 - c*a)
1188 // => dy/dx = (x - x0)/(1/(cr^2) - (x - x0)^2)
1189 Double_t x0 = -b / a;
1190 if (-c * a + b * b + 1 > 0) {
1191 if (1.0/(curvature * curvature) - (x - x0) * (x - x0) > 0.0) {
1192 Double_t yderiv = (x - x0) / TMath::Sqrt(1.0/(curvature * curvature) - (x - x0) * (x - x0));
1193 if (a < 0) yderiv *= -1.0;
1194 dy = yderiv;
1195 }
1196 }
1197 z = offset + slope * (x - xref);
1198 dz = slope;
1199 tracklets[iLayer].SetYref(0, y);
1200 tracklets[iLayer].SetYref(1, dy);
1201 tracklets[iLayer].SetZref(0, z);
1202 tracklets[iLayer].SetZref(1, dz);
1203 tracklets[iLayer].SetC(curvature);
1204 tracklets[iLayer].SetChi2(chi2track);
1205 }
1206
3a039a31 1207/* if(fReconstructor->GetStreamLevel() >=5){
29f95561 1208 TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
41702fec 1209 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
1210 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
1211 Double_t chi2z = CalculateChi2Z(tracklets, offset, slope, xref);
1212 cstreamer << "FitTiltedRieman0"
1213 << "EventNumber=" << eventNumber
1214 << "CandidateNumber=" << candidateNumber
1215 << "xref=" << xref
1216 << "Chi2Z=" << chi2z
1217 << "\n";
3a039a31 1218 }*/
41702fec 1219 return chi2track;
eb38ed55 1220}
1221
3b57a3f7 1222
9e333711 1223//____________________________________________________________________
6e4d4425 1224Double_t AliTRDtrackerV1::FitLine(const AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t err, Int_t np, AliTrackPoint *points)
9e333711 1225{
1226 AliTRDLeastSquare yfitter, zfitter;
1227 AliTRDcluster *cl = 0x0;
1228
1229 AliTRDseedV1 work[kNPlanes], *tracklet = 0x0;
1230 if(!tracklets){
1231 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1232 if(!(tracklet = track->GetTracklet(ipl))) continue;
1233 if(!tracklet->IsOK()) continue;
1234 new(&work[ipl]) AliTRDseedV1(*tracklet);
1235 }
1236 tracklets = &work[0];
1237 }
1238
1239 Double_t xref = CalculateReferenceX(tracklets);
1240 Double_t x, y, z, dx, ye, yr, tilt;
1241 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1242 if(!tracklets[ipl].IsOK()) continue;
1243 for(Int_t itb = 0; itb < fgNTimeBins; itb++){
1244 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1245 if (!tracklets[ipl].IsUsable(itb)) continue;
1246 x = cl->GetX();
1247 z = cl->GetZ();
1248 dx = x - xref;
1249 zfitter.AddPoint(&dx, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
1250 }
1251 }
1252 zfitter.Eval();
1253 Double_t z0 = zfitter.GetFunctionParameter(0);
1254 Double_t dzdx = zfitter.GetFunctionParameter(1);
1255 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1256 if(!tracklets[ipl].IsOK()) continue;
1257 for(Int_t itb = 0; itb < fgNTimeBins; itb++){
1258 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1259 if (!tracklets[ipl].IsUsable(itb)) continue;
1260 x = cl->GetX();
1261 y = cl->GetY();
1262 z = cl->GetZ();
1263 tilt = tracklets[ipl].GetTilt();
1264 dx = x - xref;
1265 yr = y + tilt*(z - z0 - dzdx*dx);
1266 // error definition changes for the different calls
1267 ye = tilt*TMath::Sqrt(cl->GetSigmaZ2());
1268 ye += err ? tracklets[ipl].GetSigmaY() : 0.2;
1269 yfitter.AddPoint(&dx, yr, ye);
1270 }
1271 }
1272 yfitter.Eval();
1273 Double_t y0 = yfitter.GetFunctionParameter(0);
1274 Double_t dydx = yfitter.GetFunctionParameter(1);
1275 Double_t chi2 = 0.;//yfitter.GetChisquare()/Double_t(nPoints);
1276
1277 //update track points array
1278 if(np && points){
1279 Float_t xyz[3];
1280 for(int ip=0; ip<np; ip++){
1281 points[ip].GetXYZ(xyz);
1282 xyz[1] = y0 + dydx * (xyz[0] - xref);
1283 xyz[2] = z0 + dzdx * (xyz[0] - xref);
1284 points[ip].SetXYZ(xyz);
1285 }
1286 }
1287 return chi2;
1288}
1289
1290
3b57a3f7 1291//_________________________________________________________________________
6e4d4425 1292Double_t AliTRDtrackerV1::FitRiemanTilt(const AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t sigError, Int_t np, AliTrackPoint *points)
3b57a3f7 1293{
41702fec 1294 //
1295 // Performs a Riemann fit taking tilting pad correction into account
1296 // The equation of a Riemann circle, where the y position is substituted by the
1297 // measured y-position taking pad tilting into account, has to be transformed
1298 // into a 4-dimensional hyperplane equation
1299 // Riemann circle: (x-x0)^2 + (y-y0)^2 -R^2 = 0
1300 // Measured y-Position: ymeas = y - tan(phiT)(zc - zt)
1301 // zc: center of the pad row
1302 // zt: z-position of the track
1303 // The z-position of the track is assumed to be linear dependent on the x-position
1304 // Transformed equation: a + b * u + c * t + d * v + e * w - 2 * (ymeas + tan(phiT) * zc) * t = 0
1305 // Transformation: u = 2 * x * t
1306 // v = 2 * tan(phiT) * t
1307 // w = 2 * tan(phiT) * (x - xref) * t
1308 // t = 1 / (x^2 + ymeas^2)
1309 // Parameters: a = -1/y0
1310 // b = x0/y0
1311 // c = (R^2 -x0^2 - y0^2)/y0
1312 // d = offset
1313 // e = dz/dx
1314 // If the offset respectively the slope in z-position is impossible, the parameters are fixed using
1315 // results from the simple riemann fit. Afterwards the fit is redone.
1316 // The curvature is calculated according to the formula:
1317 // curv = a/(1 + b^2 + c*a) = 1/R
1318 //
1319 // Paramters: - Array of tracklets (connected to the track candidate)
1320 // - Flag selecting the error definition
1321 // Output: - Chi2 values of the track (in Parameter list)
1322 //
1323 TLinearFitter *fitter = GetTiltedRiemanFitter();
1324 fitter->StoreData(kTRUE);
1325 fitter->ClearPoints();
1326 AliTRDLeastSquare zfitter;
1327 AliTRDcluster *cl = 0x0;
3b57a3f7 1328
1329 AliTRDseedV1 work[kNPlanes], *tracklet = 0x0;
1330 if(!tracklets){
1331 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1332 if(!(tracklet = track->GetTracklet(ipl))) continue;
1333 if(!tracklet->IsOK()) continue;
1334 new(&work[ipl]) AliTRDseedV1(*tracklet);
1335 }
1336 tracklets = &work[0];
1337 }
1338
41702fec 1339 Double_t xref = CalculateReferenceX(tracklets);
1340 Double_t x, y, z, t, tilt, dx, w, we;
1341 Double_t uvt[4];
1342 Int_t nPoints = 0;
1343 // Containers for Least-square fitter
1344 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1345 if(!tracklets[ipl].IsOK()) continue;
8d2bec9e 1346 for(Int_t itb = 0; itb < AliTRDseedV1::kNclusters; itb++){
41702fec 1347 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1348 if (!tracklets[ipl].IsUsable(itb)) continue;
1349 x = cl->GetX();
1350 y = cl->GetY();
1351 z = cl->GetZ();
1352 tilt = tracklets[ipl].GetTilt();
1353 dx = x - xref;
1354 // Transformation
1355 t = 1./(x*x + y*y);
1356 uvt[0] = 2. * x * t;
1357 uvt[1] = t;
1358 uvt[2] = 2. * tilt * t;
1359 uvt[3] = 2. * tilt * dx * t;
1360 w = 2. * (y + tilt*z) * t;
1361 // error definition changes for the different calls
1362 we = 2. * t;
f29f13a6 1363 we *= sigError ? TMath::Sqrt(cl->GetSigmaY2()) : 0.2;
41702fec 1364 fitter->AddPoint(uvt, w, we);
1365 zfitter.AddPoint(&x, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
1366 nPoints++;
1367 }
1368 }
aec26713 1369 if(fitter->Eval()) return 1.E10;
1370
41702fec 1371 Double_t z0 = fitter->GetParameter(3);
1372 Double_t dzdx = fitter->GetParameter(4);
3b57a3f7 1373
1374
1375 // Linear fitter - not possible to make boundaries
1376 // Do not accept non possible z and dzdx combinations
1377 Bool_t accept = kTRUE;
1378 Double_t zref = 0.0;
1379 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
1380 if(!tracklets[iLayer].IsOK()) continue;
1381 zref = z0 + dzdx * (tracklets[iLayer].GetX0() - xref);
e3cf3d02 1382 if (TMath::Abs(tracklets[iLayer].GetZfit(0) - zref) > tracklets[iLayer].GetPadLength() * 0.5 + 1.0)
3b57a3f7 1383 accept = kFALSE;
1384 }
1385 if (!accept) {
41702fec 1386 zfitter.Eval();
3b57a3f7 1387 Double_t dzmf = zfitter.GetFunctionParameter(1);
1388 Double_t zmf = zfitter.GetFunctionValue(&xref);
1389 fitter->FixParameter(3, zmf);
1390 fitter->FixParameter(4, dzmf);
1391 fitter->Eval();
1392 fitter->ReleaseParameter(3);
1393 fitter->ReleaseParameter(4);
1394 z0 = fitter->GetParameter(3); // = zmf ?
1395 dzdx = fitter->GetParameter(4); // = dzmf ?
1396 }
1397
1398 // Calculate Curvature
1399 Double_t a = fitter->GetParameter(0);
1400 Double_t b = fitter->GetParameter(1);
1401 Double_t c = fitter->GetParameter(2);
1402 Double_t y0 = 1. / a;
1403 Double_t x0 = -b * y0;
a015e406 1404 Double_t tmp = y0*y0 + x0*x0 - c*y0;
1405 if(tmp<=0.) return 1.E10;
1406 Double_t R = TMath::Sqrt(tmp);
3b57a3f7 1407 Double_t C = 1.0 + b*b - c*a;
1408 if (C > 0.0) C = a / TMath::Sqrt(C);
1409
1410 // Calculate chi2 of the fit
1411 Double_t chi2 = fitter->GetChisquare()/Double_t(nPoints);
1412
1413 // Update the tracklets
1414 if(!track){
1415 for(Int_t ip = 0; ip < kNPlanes; ip++) {
1416 x = tracklets[ip].GetX0();
90cf7133 1417 tmp = R*R-(x-x0)*(x-x0);
a015e406 1418 if(tmp <= 0.) continue;
1419 tmp = TMath::Sqrt(tmp);
3b57a3f7 1420
1421 // y: R^2 = (x - x0)^2 + (y - y0)^2
1422 // => y = y0 +/- Sqrt(R^2 - (x - x0)^2)
1423 tracklets[ip].SetYref(0, y0 - (y0>0.?1.:-1)*tmp);
1424 // => dy/dx = (x - x0)/Sqrt(R^2 - (x - x0)^2)
1425 tracklets[ip].SetYref(1, (x - x0) / tmp);
1426 tracklets[ip].SetZref(0, z0 + dzdx * (x - xref));
1427 tracklets[ip].SetZref(1, dzdx);
1428 tracklets[ip].SetC(C);
1429 tracklets[ip].SetChi2(chi2);
1430 }
1431 }
3b57a3f7 1432 //update track points array
1433 if(np && points){
1434 Float_t xyz[3];
1435 for(int ip=0; ip<np; ip++){
1436 points[ip].GetXYZ(xyz);
60e55aee 1437 xyz[1] = TMath::Abs(xyz[0] - x0) > R ? 100. : y0 - (y0>0.?1.:-1.)*TMath::Sqrt((R-(xyz[0]-x0))*(R+(xyz[0]-x0)));
3b57a3f7 1438 xyz[2] = z0 + dzdx * (xyz[0] - xref);
1439 points[ip].SetXYZ(xyz);
1440 }
1441 }
1442
3b57a3f7 1443 return chi2;
1444}
1445
1446
1bf51039 1447//____________________________________________________________________
1448Double_t AliTRDtrackerV1::FitKalman(AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t up, Int_t np, AliTrackPoint *points)
1449{
1450// Kalman filter implementation for the TRD.
1451// It returns the positions of the fit in the array "points"
1452//
1453// Author : A.Bercuci@gsi.de
1454
3cfaffa4 1455 // printf("Start track @ x[%f]\n", track->GetX());
1bf51039 1456
1457 //prepare marker points along the track
1458 Int_t ip = np ? 0 : 1;
1459 while(ip<np){
1460 if((up?-1:1) * (track->GetX() - points[ip].GetX()) > 0.) break;
1461 //printf("AliTRDtrackerV1::FitKalman() : Skip track marker x[%d] = %7.3f. Before track start ( %7.3f ).\n", ip, points[ip].GetX(), track->GetX());
1462 ip++;
1463 }
1464 //if(points) printf("First marker point @ x[%d] = %f\n", ip, points[ip].GetX());
1465
1466
1467 AliTRDseedV1 tracklet, *ptrTracklet = 0x0;
1468
1469 //Loop through the TRD planes
1470 for (Int_t jplane = 0; jplane < kNPlanes; jplane++) {
1471 // GET TRACKLET OR BUILT IT
1472 Int_t iplane = up ? jplane : kNPlanes - 1 - jplane;
1473 if(tracklets){
1474 if(!(ptrTracklet = &tracklets[iplane])) continue;
1475 }else{
1476 if(!(ptrTracklet = track->GetTracklet(iplane))){
1477 /*AliTRDtrackerV1 *tracker = 0x0;
1478 if(!(tracker = dynamic_cast<AliTRDtrackerV1*>( AliTRDReconstructor::Tracker()))) continue;
1479 ptrTracklet = new(&tracklet) AliTRDseedV1(iplane);
1480 if(!tracker->MakeTracklet(ptrTracklet, track)) */
1481 continue;
1482 }
1483 }
1484 if(!ptrTracklet->IsOK()) continue;
1485
1486 Double_t x = ptrTracklet->GetX0();
1487
1488 while(ip < np){
1489 //don't do anything if next marker is after next update point.
1490 if((up?-1:1) * (points[ip].GetX() - x) - fgkMaxStep < 0) break;
1bf51039 1491 if(((up?-1:1) * (points[ip].GetX() - track->GetX()) < 0) && !PropagateToX(*track, points[ip].GetX(), fgkMaxStep)) return -1.;
1492
1493 Double_t xyz[3]; // should also get the covariance
3cfaffa4 1494 track->GetXYZ(xyz);
1495 track->Global2LocalPosition(xyz, track->GetAlpha());
1496 points[ip].SetXYZ(xyz[0], xyz[1], xyz[2]);
1bf51039 1497 ip++;
1498 }
3cfaffa4 1499 // printf("plane[%d] tracklet[%p] x[%f]\n", iplane, ptrTracklet, x);
1bf51039 1500
3cfaffa4 1501 // Propagate closer to the next update point
1bf51039 1502 if(((up?-1:1) * (x - track->GetX()) + fgkMaxStep < 0) && !PropagateToX(*track, x + (up?-1:1)*fgkMaxStep, fgkMaxStep)) return -1.;
1503
1504 if(!AdjustSector(track)) return -1;
1505 if(TMath::Abs(track->GetSnp()) > fgkMaxSnp) return -1;
1506
1507 //load tracklet to the tracker and the track
1508/* Int_t index;
1509 if((index = FindTracklet(ptrTracklet)) < 0){
1510 ptrTracklet = SetTracklet(&tracklet);
1511 index = fTracklets->GetEntriesFast()-1;
1512 }
1513 track->SetTracklet(ptrTracklet, index);*/
1514
1515
1516 // register tracklet to track with tracklet creation !!
1517 // PropagateBack : loaded tracklet to the tracker and update index
1518 // RefitInward : update index
1519 // MakeTrack : loaded tracklet to the tracker and update index
1520 if(!tracklets) track->SetTracklet(ptrTracklet, -1);
1521
1522
1523 //Calculate the mean material budget along the path inside the chamber
1524 Double_t xyz0[3]; track->GetXYZ(xyz0);
1525 Double_t alpha = track->GetAlpha();
1526 Double_t xyz1[3], y, z;
1527 if(!track->GetProlongation(x, y, z)) return -1;
1528 xyz1[0] = x * TMath::Cos(alpha) - y * TMath::Sin(alpha);
1529 xyz1[1] = +x * TMath::Sin(alpha) + y * TMath::Cos(alpha);
1530 xyz1[2] = z;
3cfaffa4 1531 if((xyz0[0] - xyz1[9] < 1e-3) && (xyz0[0] - xyz1[9] < 1e-3)) continue; // check wheter we are at the same global x position
1bf51039 1532 Double_t param[7];
3cfaffa4 1533 if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param) <=0.) break;
1bf51039 1534 Double_t xrho = param[0]*param[4]; // density*length
1535 Double_t xx0 = param[1]; // radiation length
1536
1537 //Propagate the track
1538 track->PropagateTo(x, xx0, xrho);
1539 if (!AdjustSector(track)) break;
1540
1541 //Update track
1542 Double_t chi2 = track->GetPredictedChi2(ptrTracklet);
1543 if(chi2<1e+10) track->Update(ptrTracklet, chi2);
1bf51039 1544 if(!up) continue;
1545
1546 //Reset material budget if 2 consecutive gold
1547 if(iplane>0 && track->GetTracklet(iplane-1) && ptrTracklet->GetN() + track->GetTracklet(iplane-1)->GetN() > 20) track->SetBudget(2, 0.);
1548 } // end planes loop
1549
1550 // extrapolation
1551 while(ip < np){
1552 if(((up?-1:1) * (points[ip].GetX() - track->GetX()) < 0) && !PropagateToX(*track, points[ip].GetX(), fgkMaxStep)) return -1.;
1553
1554 Double_t xyz[3]; // should also get the covariance
3cfaffa4 1555 track->GetXYZ(xyz);
1556 track->Global2LocalPosition(xyz, track->GetAlpha());
1557 points[ip].SetXYZ(xyz[0], xyz[1], xyz[2]);
1bf51039 1558 ip++;
1559 }
1560
1561 return track->GetChi2();
1562}
3b57a3f7 1563
eb38ed55 1564//_________________________________________________________________________
bb56afff 1565Float_t AliTRDtrackerV1::CalculateChi2Z(AliTRDseedV1 *tracklets, Double_t offset, Double_t slope, Double_t xref)
eb38ed55 1566{
41702fec 1567 //
1568 // Calculates the chi2-value of the track in z-Direction including tilting pad correction.
1569 // A linear dependence on the x-value serves as a model.
1570 // The parameters are related to the tilted Riemann fit.
1571 // Parameters: - Array of tracklets (AliTRDseedV1) related to the track candidate
1572 // - the offset for the reference x
1573 // - the slope
1574 // - the reference x position
1575 // Output: - The Chi2 value of the track in z-Direction
1576 //
1577 Float_t chi2Z = 0, nLayers = 0;
053767a4 1578 for (Int_t iLayer = 0; iLayer < AliTRDgeometry::kNlayer; iLayer++) {
41702fec 1579 if(!tracklets[iLayer].IsOK()) continue;
1580 Double_t z = offset + slope * (tracklets[iLayer].GetX0() - xref);
e3cf3d02 1581 chi2Z += TMath::Abs(tracklets[iLayer].GetZfit(0) - z);
41702fec 1582 nLayers++;
1583 }
1584 chi2Z /= TMath::Max((nLayers - 3.0),1.0);
1585 return chi2Z;
eb38ed55 1586}
1587
bccda319 1588//_____________________________________________________________________________
1589Int_t AliTRDtrackerV1::PropagateToX(AliTRDtrackV1 &t, Double_t xToGo, Double_t maxStep)
1590{
41702fec 1591 //
1592 // Starting from current X-position of track <t> this function
1593 // extrapolates the track up to radial position <xToGo>.
1594 // Returns 1 if track reaches the plane, and 0 otherwise
1595 //
bccda319 1596
41702fec 1597 const Double_t kEpsilon = 0.00001;
bccda319 1598
41702fec 1599 // Current track X-position
1600 Double_t xpos = t.GetX();
bccda319 1601
41702fec 1602 // Direction: inward or outward
1603 Double_t dir = (xpos < xToGo) ? 1.0 : -1.0;
bccda319 1604
41702fec 1605 while (((xToGo - xpos) * dir) > kEpsilon) {
bccda319 1606
41702fec 1607 Double_t xyz0[3];
1608 Double_t xyz1[3];
1609 Double_t param[7];
1610 Double_t x;
1611 Double_t y;
1612 Double_t z;
bccda319 1613
41702fec 1614 // The next step size
1615 Double_t step = dir * TMath::Min(TMath::Abs(xToGo-xpos),maxStep);
bccda319 1616
41702fec 1617 // Get the global position of the starting point
1618 t.GetXYZ(xyz0);
bccda319 1619
41702fec 1620 // X-position after next step
1621 x = xpos + step;
bccda319 1622
41702fec 1623 // Get local Y and Z at the X-position of the next step
1624 if (!t.GetProlongation(x,y,z)) {
1625 return 0; // No prolongation possible
1626 }
bccda319 1627
41702fec 1628 // The global position of the end point of this prolongation step
1629 xyz1[0] = x * TMath::Cos(t.GetAlpha()) - y * TMath::Sin(t.GetAlpha());
1630 xyz1[1] = +x * TMath::Sin(t.GetAlpha()) + y * TMath::Cos(t.GetAlpha());
1631 xyz1[2] = z;
bccda319 1632
41702fec 1633 // Calculate the mean material budget between start and
1634 // end point of this prolongation step
83dea92e 1635 if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param)<=0.) return 0;
bccda319 1636
41702fec 1637 // Propagate the track to the X-position after the next step
9c87a076 1638 if (!t.PropagateTo(x, param[1], param[0]*param[4])) return 0;
bccda319 1639
41702fec 1640 // Rotate the track if necessary
1641 AdjustSector(&t);
bccda319 1642
41702fec 1643 // New track X-position
1644 xpos = t.GetX();
bccda319 1645
41702fec 1646 }
bccda319 1647
41702fec 1648 return 1;
bccda319 1649
1650}
1651
eb38ed55 1652
1653//_____________________________________________________________________________
1654Int_t AliTRDtrackerV1::ReadClusters(TClonesArray* &array, TTree *clusterTree) const
1655{
41702fec 1656 //
1657 // Reads AliTRDclusters from the file.
1658 // The names of the cluster tree and branches
1659 // should match the ones used in AliTRDclusterizer::WriteClusters()
1660 //
1661
1662 Int_t nsize = Int_t(clusterTree->GetTotBytes() / (sizeof(AliTRDcluster)));
1663 TObjArray *clusterArray = new TObjArray(nsize+1000);
1664
1665 TBranch *branch = clusterTree->GetBranch("TRDcluster");
1666 if (!branch) {
1667 AliError("Can't get the branch !");
1668 return 1;
1669 }
1670 branch->SetAddress(&clusterArray);
1671
1672 if(!fClusters){
8ae98148 1673 Float_t nclusters = fReconstructor->GetRecoParam()->GetNClusters();
1674 if(fReconstructor->IsHLT()) nclusters /= AliTRDgeometry::kNsector;
1675 array = new TClonesArray("AliTRDcluster", Int_t(nclusters));
41702fec 1676 array->SetOwner(kTRUE);
1677 }
1678
1679 // Loop through all entries in the tree
1680 Int_t nEntries = (Int_t) clusterTree->GetEntries();
1681 Int_t nbytes = 0;
1682 Int_t ncl = 0;
1683 AliTRDcluster *c = 0x0;
1684 for (Int_t iEntry = 0; iEntry < nEntries; iEntry++) {
1685 // Import the tree
1686 nbytes += clusterTree->GetEvent(iEntry);
1687
1688 // Get the number of points in the detector
1689 Int_t nCluster = clusterArray->GetEntriesFast();
1690 for (Int_t iCluster = 0; iCluster < nCluster; iCluster++) {
1691 if(!(c = (AliTRDcluster *) clusterArray->UncheckedAt(iCluster))) continue;
1692 c->SetInChamber();
1693 new((*fClusters)[ncl++]) AliTRDcluster(*c);
1694 delete (clusterArray->RemoveAt(iCluster));
1695 }
1696
1697 }
1698 delete clusterArray;
1699
1700 return 0;
eb38ed55 1701}
1702
1703//_____________________________________________________________________________
1704Int_t AliTRDtrackerV1::LoadClusters(TTree *cTree)
1705{
41702fec 1706 //
66f6bfd9 1707 // Fills clusters into TRD tracking sectors
41702fec 1708 //
41702fec 1709
48f8adf3 1710 if(!fReconstructor->IsWritingClusters()){
1711 fClusters = AliTRDReconstructor::GetClusters();
1712 } else {
66f6bfd9 1713 if (ReadClusters(fClusters, cTree)) {
1714 AliError("Problem with reading the clusters !");
1715 return 1;
1716 }
1717 }
1718 SetClustersOwner();
1719
48f8adf3 1720 if(!fClusters || !fClusters->GetEntriesFast()){
66f6bfd9 1721 AliInfo("No TRD clusters");
41702fec 1722 return 1;
1723 }
66f6bfd9 1724
1725 //Int_t nin =
1726 BuildTrackingContainers();
1727
1728 //Int_t ncl = fClusters->GetEntriesFast();
1729 //AliInfo(Form("Clusters %d [%6.2f %% in the active volume]", ncl, 100.*float(nin)/ncl));
1730
1731 return 0;
1732}
1733
1734//_____________________________________________________________________________
1735Int_t AliTRDtrackerV1::LoadClusters(TClonesArray *clusters)
1736{
1737 //
1738 // Fills clusters into TRD tracking sectors
1739 // Function for use in the HLT
1740
1741 if(!clusters || !clusters->GetEntriesFast()){
1742 AliInfo("No TRD clusters");
41702fec 1743 return 1;
1744 }
1745
66f6bfd9 1746 fClusters = clusters;
1747 SetClustersOwner();
1748
1749 //Int_t nin =
1750 BuildTrackingContainers();
1751
1752 //Int_t ncl = fClusters->GetEntriesFast();
1753 //AliInfo(Form("Clusters %d [%6.2f %% in the active volume]", ncl, 100.*float(nin)/ncl));
1754
1755 return 0;
1756}
1757
1758
1759//____________________________________________________________________
1760Int_t AliTRDtrackerV1::BuildTrackingContainers()
1761{
1762// Building tracking containers for clusters
1763
1764 Int_t nin =0, icl = fClusters->GetEntriesFast();
41702fec 1765 while (icl--) {
1766 AliTRDcluster *c = (AliTRDcluster *) fClusters->UncheckedAt(icl);
1767 if(c->IsInChamber()) nin++;
1768 Int_t detector = c->GetDetector();
1769 Int_t sector = fGeom->GetSector(detector);
053767a4 1770 Int_t stack = fGeom->GetStack(detector);
1771 Int_t layer = fGeom->GetLayer(detector);
41702fec 1772
053767a4 1773 fTrSec[sector].GetChamber(stack, layer, kTRUE)->InsertCluster(c, icl);
41702fec 1774 }
b0a48c4d 1775
1776 const AliTRDCalDet *cal = AliTRDcalibDB::Instance()->GetT0Det();
053767a4 1777 for(int isector =0; isector<AliTRDgeometry::kNsector; isector++){
41702fec 1778 if(!fTrSec[isector].GetNChambers()) continue;
b0a48c4d 1779 fTrSec[isector].Init(fReconstructor, cal);
41702fec 1780 }
66f6bfd9 1781
1782 return nin;
eb38ed55 1783}
1784
1785
66f6bfd9 1786
0906e73e 1787//____________________________________________________________________
1788void AliTRDtrackerV1::UnloadClusters()
1789{
41702fec 1790 //
1791 // Clears the arrays of clusters and tracks. Resets sectors and timebins
1792 //
0906e73e 1793
41702fec 1794 if(fTracks) fTracks->Delete();
1795 if(fTracklets) fTracklets->Delete();
48f8adf3 1796 if(fClusters){
1797 if(IsClustersOwner()) fClusters->Delete();
1798
1799 // save clusters array in the reconstructor for further use.
1800 if(!fReconstructor->IsWritingClusters()){
1801 AliTRDReconstructor::SetClusters(fClusters);
1802 SetClustersOwner(kFALSE);
1803 } else AliTRDReconstructor::SetClusters(0x0);
1804 }
0906e73e 1805
053767a4 1806 for (int i = 0; i < AliTRDgeometry::kNsector; i++) fTrSec[i].Clear();
0906e73e 1807
41702fec 1808 // Increment the Event Number
1809 AliTRDtrackerDebug::SetEventNumber(AliTRDtrackerDebug::GetEventNumber() + 1);
eb38ed55 1810}
0906e73e 1811
fac58f00 1812// //____________________________________________________________________
1813// void AliTRDtrackerV1::UseClusters(const AliKalmanTrack *t, Int_t) const
1814// {
1815// const AliTRDtrackV1 *track = dynamic_cast<const AliTRDtrackV1*>(t);
1816// if(!track) return;
1817//
1818// AliTRDseedV1 *tracklet = 0x0;
1819// for(Int_t ily=AliTRDgeometry::kNlayer; ily--;){
1820// if(!(tracklet = track->GetTracklet(ily))) continue;
1821// AliTRDcluster *c = 0x0;
8d2bec9e 1822// for(Int_t ic=AliTRDseed::kNclusters; ic--;){
fac58f00 1823// if(!(c=tracklet->GetClusters(ic))) continue;
1824// c->Use();
1825// }
1826// }
1827// }
1828//
b1957d3c 1829
eb38ed55 1830//_____________________________________________________________________________
1831Bool_t AliTRDtrackerV1::AdjustSector(AliTRDtrackV1 *track)
1832{
41702fec 1833 //
1834 // Rotates the track when necessary
1835 //
1836
1837 Double_t alpha = AliTRDgeometry::GetAlpha();
1838 Double_t y = track->GetY();
1839 Double_t ymax = track->GetX()*TMath::Tan(0.5*alpha);
3cfaffa4 1840
41702fec 1841 if (y > ymax) {
1842 if (!track->Rotate( alpha)) {
1843 return kFALSE;
1844 }
1845 }
1846 else if (y < -ymax) {
1847 if (!track->Rotate(-alpha)) {
1848 return kFALSE;
1849 }
1850 }
1851
1852 return kTRUE;
0906e73e 1853
1854}
1855
eb38ed55 1856
0906e73e 1857//____________________________________________________________________
1858AliTRDseedV1* AliTRDtrackerV1::GetTracklet(AliTRDtrackV1 *track, Int_t p, Int_t &idx)
1859{
41702fec 1860 // Find tracklet for TRD track <track>
1861 // Parameters
1862 // - track
1863 // - sector
1864 // - plane
1865 // - index
1866 // Output
1867 // tracklet
1868 // index
1869 // Detailed description
1870 //
1871 idx = track->GetTrackletIndex(p);
1872 AliTRDseedV1 *tracklet = (idx==0xffff) ? 0x0 : (AliTRDseedV1*)fTracklets->UncheckedAt(idx);
1873
1874 return tracklet;
0906e73e 1875}
1876
1877//____________________________________________________________________
3b57a3f7 1878AliTRDseedV1* AliTRDtrackerV1::SetTracklet(AliTRDseedV1 *tracklet)
0906e73e 1879{
41702fec 1880 // Add this tracklet to the list of tracklets stored in the tracker
1881 //
1882 // Parameters
1883 // - tracklet : pointer to the tracklet to be added to the list
1884 //
1885 // Output
1886 // - the index of the new tracklet in the tracker tracklets list
1887 //
1888 // Detailed description
1889 // Build the tracklets list if it is not yet created (late initialization)
1890 // and adds the new tracklet to the list.
1891 //
1892 if(!fTracklets){
053767a4 1893 fTracklets = new TClonesArray("AliTRDseedV1", AliTRDgeometry::Nsector()*kMaxTracksStack);
41702fec 1894 fTracklets->SetOwner(kTRUE);
1895 }
1896 Int_t nentries = fTracklets->GetEntriesFast();
1897 return new ((*fTracklets)[nentries]) AliTRDseedV1(*tracklet);
972ef65e 1898}
1899
d20df6fc 1900//____________________________________________________________________
1901AliTRDtrackV1* AliTRDtrackerV1::SetTrack(AliTRDtrackV1 *track)
1902{
1903 // Add this track to the list of tracks stored in the tracker
1904 //
1905 // Parameters
1906 // - track : pointer to the track to be added to the list
1907 //
1908 // Output
1909 // - the pointer added
1910 //
1911 // Detailed description
1912 // Build the tracks list if it is not yet created (late initialization)
1913 // and adds the new track to the list.
1914 //
1915 if(!fTracks){
053767a4 1916 fTracks = new TClonesArray("AliTRDtrackV1", AliTRDgeometry::Nsector()*kMaxTracksStack);
d20df6fc 1917 fTracks->SetOwner(kTRUE);
1918 }
1919 Int_t nentries = fTracks->GetEntriesFast();
1920 return new ((*fTracks)[nentries]) AliTRDtrackV1(*track);
1921}
1922
1923
0906e73e 1924
e4f2f73d 1925//____________________________________________________________________
eb38ed55 1926Int_t AliTRDtrackerV1::Clusters2TracksSM(Int_t sector, AliESDEvent *esd)
e4f2f73d 1927{
41702fec 1928 //
1929 // Steer tracking for one SM.
1930 //
1931 // Parameters :
1932 // sector : Array of (SM) propagation layers containing clusters
1933 // esd : The current ESD event. On output it contains the also
1934 // the ESD (TRD) tracks found in this SM.
1935 //
1936 // Output :
1937 // Number of tracks found in this TRD supermodule.
1938 //
1939 // Detailed description
1940 //
1941 // 1. Unpack AliTRDpropagationLayers objects for each stack.
1942 // 2. Launch stack tracking.
1943 // See AliTRDtrackerV1::Clusters2TracksStack() for details.
1944 // 3. Pack results in the ESD event.
1945 //
1946
1947 // allocate space for esd tracks in this SM
1948 TClonesArray esdTrackList("AliESDtrack", 2*kMaxTracksStack);
1949 esdTrackList.SetOwner();
1950
1951 Int_t nTracks = 0;
1952 Int_t nChambers = 0;
1953 AliTRDtrackingChamber **stack = 0x0, *chamber = 0x0;
053767a4 1954 for(int istack = 0; istack<AliTRDgeometry::kNstack; istack++){
41702fec 1955 if(!(stack = fTrSec[sector].GetStack(istack))) continue;
1956 nChambers = 0;
053767a4 1957 for(int ilayer=0; ilayer<AliTRDgeometry::kNlayer; ilayer++){
1958 if(!(chamber = stack[ilayer])) continue;
3a039a31 1959 if(chamber->GetNClusters() < fgNTimeBins * fReconstructor->GetRecoParam() ->GetFindableClusters()) continue;
41702fec 1960 nChambers++;
053767a4 1961 //AliInfo(Form("sector %d stack %d layer %d clusters %d", sector, istack, ilayer, chamber->GetNClusters()));
41702fec 1962 }
1963 if(nChambers < 4) continue;
1964 //AliInfo(Form("Doing stack %d", istack));
1965 nTracks += Clusters2TracksStack(stack, &esdTrackList);
1966 }
1967 //AliInfo(Form("Found %d tracks in SM %d [%d]\n", nTracks, sector, esd->GetNumberOfTracks()));
1968
1969 for(int itrack=0; itrack<nTracks; itrack++)
1970 esd->AddTrack((AliESDtrack*)esdTrackList[itrack]);
1971
1972 // Reset Track and Candidate Number
1973 AliTRDtrackerDebug::SetCandidateNumber(0);
1974 AliTRDtrackerDebug::SetTrackNumber(0);
1975 return nTracks;
e4f2f73d 1976}
1977
1978//____________________________________________________________________
eb38ed55 1979Int_t AliTRDtrackerV1::Clusters2TracksStack(AliTRDtrackingChamber **stack, TClonesArray *esdTrackList)
e4f2f73d 1980{
41702fec 1981 //
1982 // Make tracks in one TRD stack.
1983 //
1984 // Parameters :
1985 // layer : Array of stack propagation layers containing clusters
1986 // esdTrackList : Array of ESD tracks found by the stand alone tracker.
1987 // On exit the tracks found in this stack are appended.
1988 //
1989 // Output :
1990 // Number of tracks found in this stack.
1991 //
1992 // Detailed description
1993 //
1994 // 1. Find the 3 most useful seeding chambers. See BuildSeedingConfigs() for details.
1995 // 2. Steer AliTRDtrackerV1::MakeSeeds() for 3 seeding layer configurations.
1996 // See AliTRDtrackerV1::MakeSeeds() for more details.
1997 // 3. Arrange track candidates in decreasing order of their quality
1998 // 4. Classify tracks in 5 categories according to:
1999 // a) number of layers crossed
2000 // b) track quality
2001 // 5. Sign clusters by tracks in decreasing order of track quality
2002 // 6. Build AliTRDtrack out of seeding tracklets
2003 // 7. Cook MC label
2004 // 8. Build ESD track and register it to the output list
2005 //
2006
b0a48c4d 2007 const AliTRDCalDet *cal = AliTRDcalibDB::Instance()->GetT0Det();
41702fec 2008 AliTRDtrackingChamber *chamber = 0x0;
fac58f00 2009 AliTRDtrackingChamber **ci = 0x0;
41702fec 2010 AliTRDseedV1 sseed[kMaxTracksStack*6]; // to be initialized
2011 Int_t pars[4]; // MakeSeeds parameters
2012
2013 //Double_t alpha = AliTRDgeometry::GetAlpha();
2014 //Double_t shift = .5 * alpha;
2015 Int_t configs[kNConfigs];
2016
fac58f00 2017 // Purge used clusters from the containers
2018 ci = &stack[0];
2019 for(Int_t ic = kNPlanes; ic--; ci++){
2020 if(!(*ci)) continue;
2021 (*ci)->Update();
2022 }
2023
41702fec 2024 // Build initial seeding configurations
2025 Double_t quality = BuildSeedingConfigs(stack, configs);
eb2b4f91 2026 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 10){
41702fec 2027 AliInfo(Form("Plane config %d %d %d Quality %f"
2028 , configs[0], configs[1], configs[2], quality));
2029 }
d931f2aa 2030
41702fec 2031
2032 // Initialize contors
2033 Int_t ntracks, // number of TRD track candidates
2034 ntracks1, // number of registered TRD tracks/iter
2035 ntracks2 = 0; // number of all registered TRD tracks in stack
2036 fSieveSeeding = 0;
d931f2aa 2037
2038 // Get stack index
fac58f00 2039 Int_t ic = 0; ci = &stack[0];
2040 while(ic<kNPlanes && !(*ci)){ic++; ci++;}
2041 if(!(*ci)) return ntracks2;
2042 Int_t istack = fGeom->GetStack((*ci)->GetDetector());
d931f2aa 2043
41702fec 2044 do{
2045 // Loop over seeding configurations
2046 ntracks = 0; ntracks1 = 0;
2047 for (Int_t iconf = 0; iconf<3; iconf++) {
2048 pars[0] = configs[iconf];
2049 pars[1] = ntracks;
d931f2aa 2050 pars[2] = istack;
41702fec 2051 ntracks = MakeSeeds(stack, &sseed[6*ntracks], pars);
2052 if(ntracks == kMaxTracksStack) break;
2053 }
eb2b4f91 2054 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 10) AliInfo(Form("Candidate TRD tracks %d in iteration %d.", ntracks, fSieveSeeding));
41702fec 2055
2056 if(!ntracks) break;
2057
2058 // Sort the seeds according to their quality
2059 Int_t sort[kMaxTracksStack];
2060 TMath::Sort(ntracks, fTrackQuality, sort, kTRUE);
2061
2062 // Initialize number of tracks so far and logic switches
2063 Int_t ntracks0 = esdTrackList->GetEntriesFast();
2064 Bool_t signedTrack[kMaxTracksStack];
2065 Bool_t fakeTrack[kMaxTracksStack];
2066 for (Int_t i=0; i<ntracks; i++){
2067 signedTrack[i] = kFALSE;
2068 fakeTrack[i] = kFALSE;
2069 }
2070 //AliInfo("Selecting track candidates ...");
2071
2072 // Sieve clusters in decreasing order of track quality
2073 Double_t trackParams[7];
2074 // AliTRDseedV1 *lseed = 0x0;
2075 Int_t jSieve = 0, candidates;
2076 do{
2077 //AliInfo(Form("\t\tITER = %i ", jSieve));
2078
2079 // Check track candidates
2080 candidates = 0;
2081 for (Int_t itrack = 0; itrack < ntracks; itrack++) {
804bb02e 2082 Int_t trackIndex = sort[itrack];
2083 if (signedTrack[trackIndex] || fakeTrack[trackIndex]) continue;
41702fec 2084
2085
804bb02e 2086 // Calculate track parameters from tracklets seeds
804bb02e 2087 Int_t ncl = 0;
2088 Int_t nused = 0;
2089 Int_t nlayers = 0;
2090 Int_t findable = 0;
2091 for (Int_t jLayer = 0; jLayer < kNPlanes; jLayer++) {
2092 Int_t jseed = kNPlanes*trackIndex+jLayer;
2093 if(!sseed[jseed].IsOK()) continue;
f29f13a6 2094 if (TMath::Abs(sseed[jseed].GetYref(0) / sseed[jseed].GetX0()) < 0.158) findable++;
eede7907 2095 // TODO here we get a sig fault which should never happen !
804bb02e 2096 sseed[jseed].UpdateUsed();
2097 ncl += sseed[jseed].GetN2();
2098 nused += sseed[jseed].GetNUsed();
2099 nlayers++;
804bb02e 2100 }
2101
f29f13a6 2102 // Filter duplicated tracks
2103 if (nused > 30){
2104 //printf("Skip %d nused %d\n", trackIndex, nused);
2105 fakeTrack[trackIndex] = kTRUE;
2106 continue;
2107 }
2108 if (Float_t(nused)/ncl >= .25){
2109 //printf("Skip %d nused/ncl >= .25\n", trackIndex);
2110 fakeTrack[trackIndex] = kTRUE;
2111 continue;
2112 }
41702fec 2113
f29f13a6 2114 // Classify tracks
2115 Bool_t skip = kFALSE;
2116 switch(jSieve){
2117 case 0:
2118 if(nlayers < 6) {skip = kTRUE; break;}
2119 if(TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -5.){skip = kTRUE; break;}
2120 break;
2121
2122 case 1:
2123 if(nlayers < findable){skip = kTRUE; break;}
2124 if(TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -4.){skip = kTRUE; break;}
2125 break;
2126
2127 case 2:
2128 if ((nlayers == findable) || (nlayers == 6)) { skip = kTRUE; break;}
2129 if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -6.0){skip = kTRUE; break;}
2130 break;
2131
2132 case 3:
2133 if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -5.){skip = kTRUE; break;}
2134 break;
2135
2136 case 4:
2137 if (nlayers == 3){skip = kTRUE; break;}
2138 //if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) - nused/(nlayers-3.0) < -15.0){skip = kTRUE; break;}
2139 break;
2140 }
2141 if(skip){
2142 candidates++;
2143 //printf("REJECTED : %d [%d] nlayers %d trackQuality = %e nused %d\n", itrack, trackIndex, nlayers, fTrackQuality[trackIndex], nused);
2144 continue;
2145 }
2146 signedTrack[trackIndex] = kTRUE;
2147
2148 // Build track parameters
2149 AliTRDseedV1 *lseed =&sseed[trackIndex*6];
2150 /* Int_t idx = 0;
2151 while(idx<3 && !lseed->IsOK()) {
2152 idx++;
2153 lseed++;
2154 }*/
2155 Double_t x = lseed->GetX0();// - 3.5;
2156 trackParams[0] = x; //NEW AB
2157 trackParams[1] = lseed->GetYref(0); // lseed->GetYat(x);
2158 trackParams[2] = lseed->GetZref(0); // lseed->GetZat(x);
2159 trackParams[3] = TMath::Sin(TMath::ATan(lseed->GetYref(1)));
2160 trackParams[4] = lseed->GetZref(1) / TMath::Sqrt(1. + lseed->GetYref(1) * lseed->GetYref(1));
2161 trackParams[5] = lseed->GetC();
2162 Int_t ich = 0; while(!(chamber = stack[ich])) ich++;
2163 trackParams[6] = fGeom->GetSector(chamber->GetDetector());/* *alpha+shift; // Supermodule*/
2164
2165 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){
eb2b4f91 2166 //AliInfo(Form("Track %d [%d] nlayers %d trackQuality = %e nused %d, yref = %3.3f", itrack, trackIndex, nlayers, fTrackQuality[trackIndex], nused, trackParams[1]));
f29f13a6 2167
f29f13a6 2168 AliTRDseedV1 *dseed[6];
b82b4de1 2169 for(Int_t iseed = AliTRDgeometry::kNlayer; iseed--;) dseed[iseed] = new AliTRDseedV1(lseed[iseed]);
f29f13a6 2170
2171 //Int_t eventNrInFile = esd->GetEventNumberInFile();
2172 //AliInfo(Form("Number of clusters %d.", nclusters));
2173 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2174 Int_t trackNumber = AliTRDtrackerDebug::GetTrackNumber();
2175 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2176 TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
2177 cstreamer << "Clusters2TracksStack"
2178 << "EventNumber=" << eventNumber
2179 << "TrackNumber=" << trackNumber
2180 << "CandidateNumber=" << candidateNumber
2181 << "Iter=" << fSieveSeeding
2182 << "Like=" << fTrackQuality[trackIndex]
2183 << "S0.=" << dseed[0]
2184 << "S1.=" << dseed[1]
2185 << "S2.=" << dseed[2]
2186 << "S3.=" << dseed[3]
2187 << "S4.=" << dseed[4]
2188 << "S5.=" << dseed[5]
2189 << "p0=" << trackParams[0]
2190 << "p1=" << trackParams[1]
2191 << "p2=" << trackParams[2]
2192 << "p3=" << trackParams[3]
2193 << "p4=" << trackParams[4]
2194 << "p5=" << trackParams[5]
2195 << "p6=" << trackParams[6]
f29f13a6 2196 << "Ncl=" << ncl
2197 << "NLayers=" << nlayers
2198 << "Findable=" << findable
2199 << "NUsed=" << nused
2200 << "\n";
2201 }
d877f55f 2202
f29f13a6 2203 AliTRDtrackV1 *track = MakeTrack(&sseed[trackIndex*kNPlanes], trackParams);
2204 if(!track){
2205 AliWarning("Fail to build a TRD Track.");
2206 continue;
d877f55f 2207 }
41702fec 2208
f29f13a6 2209 //AliInfo("End of MakeTrack()");
2210 AliESDtrack *esdTrack = new ((*esdTrackList)[ntracks0++]) AliESDtrack();
2211 esdTrack->UpdateTrackParams(track, AliESDtrack::kTRDout);
2212 esdTrack->SetLabel(track->GetLabel());
2213 track->UpdateESDtrack(esdTrack);
2214 // write ESD-friends if neccessary
2215 if (fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 0){
2216 AliTRDtrackV1 *calibTrack = new AliTRDtrackV1(*track);
2217 calibTrack->SetOwner();
2218 esdTrack->AddCalibObject(calibTrack);
2219 }
2220 ntracks1++;
2221 AliTRDtrackerDebug::SetTrackNumber(AliTRDtrackerDebug::GetTrackNumber() + 1);
41702fec 2222 }
2223
2224 jSieve++;
2225 } while(jSieve<5 && candidates); // end track candidates sieve
2226 if(!ntracks1) break;
2227
2228 // increment counters
2229 ntracks2 += ntracks1;
4302c900 2230
2231 if(fReconstructor->IsHLT()) break;
41702fec 2232 fSieveSeeding++;
2233
2234 // Rebuild plane configurations and indices taking only unused clusters into account
2235 quality = BuildSeedingConfigs(stack, configs);
3a039a31 2236 if(quality < 1.E-7) break; //fReconstructor->GetRecoParam() ->GetPlaneQualityThreshold()) break;
41702fec 2237
2238 for(Int_t ip = 0; ip < kNPlanes; ip++){
2239 if(!(chamber = stack[ip])) continue;
b0a48c4d 2240 chamber->Build(fGeom, cal);//Indices(fSieveSeeding);
41702fec 2241 }
2242
eb2b4f91 2243 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 10){
41702fec 2244 AliInfo(Form("Sieve level %d Plane config %d %d %d Quality %f", fSieveSeeding, configs[0], configs[1], configs[2], quality));
2245 }
2246 } while(fSieveSeeding<10); // end stack clusters sieve
2247
2248
2249
2250 //AliInfo(Form("Registered TRD tracks %d in stack %d.", ntracks2, pars[1]));
2251
2252 return ntracks2;
e4f2f73d 2253}
2254
2255//___________________________________________________________________
eb38ed55 2256Double_t AliTRDtrackerV1::BuildSeedingConfigs(AliTRDtrackingChamber **stack, Int_t *configs)
e4f2f73d 2257{
41702fec 2258 //
2259 // Assign probabilities to chambers according to their
2260 // capability of producing seeds.
2261 //
2262 // Parameters :
2263 //
2264 // layers : Array of stack propagation layers for all 6 chambers in one stack
2265 // configs : On exit array of configuration indexes (see GetSeedingConfig()
2266 // for details) in the decreasing order of their seeding probabilities.
2267 //
2268 // Output :
2269 //
2270 // Return top configuration quality
2271 //
2272 // Detailed description:
2273 //
2274 // To each chamber seeding configuration (see GetSeedingConfig() for
2275 // the list of all configurations) one defines 2 quality factors:
2276 // - an apriori topological quality (see GetSeedingConfig() for details) and
2277 // - a data quality based on the uniformity of the distribution of
2278 // clusters over the x range (time bins population). See CookChamberQA() for details.
2279 // The overall chamber quality is given by the product of this 2 contributions.
2280 //
2281
eb2b4f91 2282 Double_t chamberQ[kNPlanes];memset(chamberQ, 0, kNPlanes*sizeof(Double_t));
41702fec 2283 AliTRDtrackingChamber *chamber = 0x0;
2284 for(int iplane=0; iplane<kNPlanes; iplane++){
2285 if(!(chamber = stack[iplane])) continue;
2286 chamberQ[iplane] = (chamber = stack[iplane]) ? chamber->GetQuality() : 0.;
2287 }
2288
eb2b4f91 2289 Double_t tconfig[kNConfigs];memset(tconfig, 0, kNConfigs*sizeof(Double_t));
2290 Int_t planes[] = {0, 0, 0, 0};
41702fec 2291 for(int iconf=0; iconf<kNConfigs; iconf++){
2292 GetSeedingConfig(iconf, planes);
2293 tconfig[iconf] = fgTopologicQA[iconf];
2294 for(int iplane=0; iplane<4; iplane++) tconfig[iconf] *= chamberQ[planes[iplane]];
2295 }
2296
2297 TMath::Sort((Int_t)kNConfigs, tconfig, configs, kTRUE);
2298 // AliInfo(Form("q[%d] = %f", configs[0], tconfig[configs[0]]));
2299 // AliInfo(Form("q[%d] = %f", configs[1], tconfig[configs[1]]));
2300 // AliInfo(Form("q[%d] = %f", configs[2], tconfig[configs[2]]));
2301
2302 return tconfig[configs[0]];
e4f2f73d 2303}
2304
2305//____________________________________________________________________
eb38ed55 2306Int_t AliTRDtrackerV1::MakeSeeds(AliTRDtrackingChamber **stack, AliTRDseedV1 *sseed, Int_t *ipar)
e4f2f73d 2307{
41702fec 2308 //
2309 // Make tracklet seeds in the TRD stack.
2310 //
2311 // Parameters :
2312 // layers : Array of stack propagation layers containing clusters
2313 // sseed : Array of empty tracklet seeds. On exit they are filled.
2314 // ipar : Control parameters:
2315 // ipar[0] -> seeding chambers configuration
2316 // ipar[1] -> stack index
2317 // ipar[2] -> number of track candidates found so far
2318 //
2319 // Output :
2320 // Number of tracks candidates found.
2321 //
2322 // Detailed description
2323 //
2324 // The following steps are performed:
2325 // 1. Select seeding layers from seeding chambers
2326 // 2. Select seeding clusters from the seeding AliTRDpropagationLayerStack.
2327 // The clusters are taken from layer 3, layer 0, layer 1 and layer 2, in
2328 // this order. The parameters controling the range of accepted clusters in
2329 // layer 0, 1, and 2 are defined in AliTRDchamberTimeBin::BuildCond().
2330 // 3. Helix fit of the cluster set. (see AliTRDtrackerFitter::FitRieman(AliTRDcluster**))
2331 // 4. Initialize seeding tracklets in the seeding chambers.
2332 // 5. Filter 0.
2333 // Chi2 in the Y direction less than threshold ... (1./(3. - sLayer))
2334 // Chi2 in the Z direction less than threshold ... (1./(3. - sLayer))
2335 // 6. Attach clusters to seeding tracklets and find linear approximation of
2336 // the tracklet (see AliTRDseedV1::AttachClustersIter()). The number of used
2337 // clusters used by current seeds should not exceed ... (25).
2338 // 7. Filter 1.
2339 // All 4 seeding tracklets should be correctly constructed (see
2340 // AliTRDseedV1::AttachClustersIter())
2341 // 8. Helix fit of the seeding tracklets
2342 // 9. Filter 2.
2343 // Likelihood calculation of the fit. (See AliTRDtrackerV1::CookLikelihood() for details)
2344 // 10. Extrapolation of the helix fit to the other 2 chambers:
2345 // a) Initialization of extrapolation tracklet with fit parameters
2346 // b) Helix fit of tracklets
2347 // c) Attach clusters and linear interpolation to extrapolated tracklets
2348 // d) Helix fit of tracklets
2349 // 11. Improve seeding tracklets quality by reassigning clusters.
2350 // See AliTRDtrackerV1::ImproveSeedQuality() for details.
2351 // 12. Helix fit of all 6 seeding tracklets and chi2 calculation
2352 // 13. Hyperplane fit and track quality calculation. See AliTRDtrackerFitter::FitHyperplane() for details.
2353 // 14. Cooking labels for tracklets. Should be done only for MC
2354 // 15. Register seeds.
2355 //
2356
2357 AliTRDtrackingChamber *chamber = 0x0;
be24510a 2358 AliTRDcluster *c[kNSeedPlanes] = {0x0, 0x0, 0x0, 0x0}; // initilize seeding clusters
41702fec 2359 AliTRDseedV1 *cseed = &sseed[0]; // initialize tracklets for first track
2360 Int_t ncl, mcl; // working variable for looping over clusters
2361 Int_t index[AliTRDchamberTimeBin::kMaxClustersLayer], jndex[AliTRDchamberTimeBin::kMaxClustersLayer];
2362 // chi2 storage
2363 // chi2[0] = tracklet chi2 on the Z direction
2364 // chi2[1] = tracklet chi2 on the R direction
2365 Double_t chi2[4];
2366
41702fec 2367 // this should be data member of AliTRDtrack
2368 Double_t seedQuality[kMaxTracksStack];
2369
2370 // unpack control parameters
2371 Int_t config = ipar[0];
2372 Int_t ntracks = ipar[1];
d931f2aa 2373 Int_t istack = ipar[2];
41702fec 2374 Int_t planes[kNSeedPlanes]; GetSeedingConfig(config, planes);
be24510a 2375 Int_t planesExt[kNPlanes-kNSeedPlanes]; GetExtrapolationConfig(config, planesExt);
2376
2377
41702fec 2378 // Init chambers geometry
41702fec 2379 Double_t hL[kNPlanes]; // Tilting angle
2380 Float_t padlength[kNPlanes]; // pad lenghts
dd8059a8 2381 Float_t padwidth[kNPlanes]; // pad widths
41702fec 2382 AliTRDpadPlane *pp = 0x0;
2383 for(int iplane=0; iplane<kNPlanes; iplane++){
2384 pp = fGeom->GetPadPlane(iplane, istack);
bb79ccd5 2385 hL[iplane] = TMath::Tan(TMath::DegToRad()*pp->GetTiltingAngle());
41702fec 2386 padlength[iplane] = pp->GetLengthIPad();
dd8059a8 2387 padwidth[iplane] = pp->GetWidthIPad();
41702fec 2388 }
2389
eb2b4f91 2390 // Init anode wire position for chambers
eede7907 2391 Double_t x0[kNPlanes] = {300.2, 312.8, 325.4, 338.0, 350.6, 363.2}, // anode wire position
eb2b4f91 2392 driftLength = .5*AliTRDgeometry::AmThick() - AliTRDgeometry::DrThick(); // drift length
2393 TGeoHMatrix *matrix = 0x0;
2394 Double_t loc[] = {AliTRDgeometry::AnodePos(), 0., 0.};
2395 Double_t glb[] = {0., 0., 0.};
2396 AliTRDtrackingChamber **cIter = &stack[0];
2397 for(int iLayer=kNPlanes; iLayer--; cIter++){
2398 if(!(*cIter)) continue;
2399 if(!(matrix = fGeom->GetClusterMatrix((*cIter)->GetDetector()))) continue;
2400 matrix->LocalToMaster(loc, glb);
2401 x0[iLayer] = glb[0];
2402 }
2403
2404 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 10){
41702fec 2405 AliInfo(Form("Making seeds Stack[%d] Config[%d] Tracks[%d]...", istack, config, ntracks));
2406 }
2407
d931f2aa 2408 // Build seeding layers
d611c74f 2409 ResetSeedTB();
41702fec 2410 Int_t nlayers = 0;
41702fec 2411 for(int isl=0; isl<kNSeedPlanes; isl++){
2412 if(!(chamber = stack[planes[isl]])) continue;
3a039a31 2413 if(!chamber->GetSeedingLayer(fSeedTB[isl], fGeom, fReconstructor)) continue;
41702fec 2414 nlayers++;
41702fec 2415 }
eb2b4f91 2416 if(nlayers < kNSeedPlanes) return ntracks;
41702fec 2417
2418
2419 // Start finding seeds
2420 Double_t cond0[4], cond1[4], cond2[4];
2421 Int_t icl = 0;
d611c74f 2422 while((c[3] = (*fSeedTB[3])[icl++])){
41702fec 2423 if(!c[3]) continue;
d611c74f 2424 fSeedTB[0]->BuildCond(c[3], cond0, 0);
2425 fSeedTB[0]->GetClusters(cond0, index, ncl);
41702fec 2426 //printf("Found c[3] candidates 0 %d\n", ncl);
2427 Int_t jcl = 0;
2428 while(jcl<ncl) {
d611c74f 2429 c[0] = (*fSeedTB[0])[index[jcl++]];
41702fec 2430 if(!c[0]) continue;
2431 Double_t dx = c[3]->GetX() - c[0]->GetX();
2432 Double_t theta = (c[3]->GetZ() - c[0]->GetZ())/dx;
2433 Double_t phi = (c[3]->GetY() - c[0]->GetY())/dx;
d611c74f 2434 fSeedTB[1]->BuildCond(c[0], cond1, 1, theta, phi);
2435 fSeedTB[1]->GetClusters(cond1, jndex, mcl);
41702fec 2436 //printf("Found c[0] candidates 1 %d\n", mcl);
2437
2438 Int_t kcl = 0;
2439 while(kcl<mcl) {
d611c74f 2440 c[1] = (*fSeedTB[1])[jndex[kcl++]];
2441 if(!c[1]) continue;
2442 fSeedTB[2]->BuildCond(c[1], cond2, 2, theta, phi);
2443 c[2] = fSeedTB[2]->GetNearestCluster(cond2);
2444 //printf("Found c[1] candidate 2 %p\n", c[2]);
2445 if(!c[2]) continue;
2446
2447 // AliInfo("Seeding clusters found. Building seeds ...");
2448 // for(Int_t i = 0; i < kNSeedPlanes; i++) printf("%i. coordinates: x = %6.3f, y = %6.3f, z = %6.3f\n", i, c[i]->GetX(), c[i]->GetY(), c[i]->GetZ());
2449
804bb02e 2450 for (Int_t il = 0; il < kNPlanes; il++) cseed[il].Reset();
41702fec 2451
d611c74f 2452 FitRieman(c, chi2);
2453
d931f2aa 2454 AliTRDseedV1 *tseed = &cseed[0];
bb2db46c 2455 cIter = &stack[0];
2456 for(int iLayer=0; iLayer<kNPlanes; iLayer++, tseed++, cIter++){
2457 Int_t det = (*cIter) ? (*cIter)->GetDetector() : -1;
eb2b4f91 2458 tseed->SetDetector(det);
43d6ad34 2459 tseed->SetTilt(hL[iLayer]);
2460 tseed->SetPadLength(padlength[iLayer]);
dd8059a8 2461 tseed->SetPadWidth(padwidth[iLayer]);
3a039a31 2462 tseed->SetReconstructor(fReconstructor);
eb2b4f91 2463 tseed->SetX0(det<0 ? fR[iLayer]+driftLength : x0[iLayer]);
d611c74f 2464 tseed->Init(GetRiemanFitter());
f29f13a6 2465 tseed->SetStandAlone(kTRUE);
d611c74f 2466 }
2467
2468 Bool_t isFake = kFALSE;
3a039a31 2469 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){
d611c74f 2470 if (c[0]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
2471 if (c[1]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
2472 if (c[2]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
2473
2474 Double_t xpos[4];
2475 for(Int_t l = 0; l < kNSeedPlanes; l++) xpos[l] = fSeedTB[l]->GetX();
2476 Float_t yref[4];
2477 for(int il=0; il<4; il++) yref[il] = cseed[planes[il]].GetYref(0);
2478 Int_t ll = c[3]->GetLabel(0);
2479 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2480 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2481 AliRieman *rim = GetRiemanFitter();
29f95561 2482 TTreeSRedirector &cs0 = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
d611c74f 2483 cs0 << "MakeSeeds0"
2484 <<"EventNumber=" << eventNumber
2485 <<"CandidateNumber=" << candidateNumber
2486 <<"isFake=" << isFake
2487 <<"config=" << config
2488 <<"label=" << ll
2489 <<"chi2z=" << chi2[0]
2490 <<"chi2y=" << chi2[1]
2491 <<"Y2exp=" << cond2[0]
2492 <<"Z2exp=" << cond2[1]
2493 <<"X0=" << xpos[0] //layer[sLayer]->GetX()
2494 <<"X1=" << xpos[1] //layer[sLayer + 1]->GetX()
2495 <<"X2=" << xpos[2] //layer[sLayer + 2]->GetX()
2496 <<"X3=" << xpos[3] //layer[sLayer + 3]->GetX()
2497 <<"yref0=" << yref[0]
2498 <<"yref1=" << yref[1]
2499 <<"yref2=" << yref[2]
2500 <<"yref3=" << yref[3]
2501 <<"c0.=" << c[0]
2502 <<"c1.=" << c[1]
2503 <<"c2.=" << c[2]
2504 <<"c3.=" << c[3]
2505 <<"Seed0.=" << &cseed[planes[0]]
2506 <<"Seed1.=" << &cseed[planes[1]]
2507 <<"Seed2.=" << &cseed[planes[2]]
2508 <<"Seed3.=" << &cseed[planes[3]]
2509 <<"RiemanFitter.=" << rim
2510 <<"\n";
2511 }
3a039a31 2512 if(chi2[0] > fReconstructor->GetRecoParam() ->GetChi2Z()/*7./(3. - sLayer)*//*iter*/){
91834b8d 2513// //AliInfo(Form("Failed chi2 filter on chi2Z [%f].", chi2[0]));
d611c74f 2514 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2515 continue;
2516 }
3a039a31 2517 if(chi2[1] > fReconstructor->GetRecoParam() ->GetChi2Y()/*1./(3. - sLayer)*//*iter*/){
91834b8d 2518// //AliInfo(Form("Failed chi2 filter on chi2Y [%f].", chi2[1]));
d611c74f 2519 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2520 continue;
2521 }
2522 //AliInfo("Passed chi2 filter.");
2523
2524 // try attaching clusters to tracklets
d611c74f 2525 Int_t mlayers = 0;
be24510a 2526 for(int iLayer=0; iLayer<kNSeedPlanes; iLayer++){
d611c74f 2527 Int_t jLayer = planes[iLayer];
f29f13a6 2528 if(!cseed[jLayer].AttachClusters(stack[jLayer], kTRUE)) continue;
2529 cseed[jLayer].UpdateUsed();
2530 if(!cseed[jLayer].IsOK()) continue;
d611c74f 2531 mlayers++;
2532 }
be24510a 2533
2534 if(mlayers < kNSeedPlanes){
2535 //AliInfo(Form("Failed updating all seeds %d [%d].", mlayers, kNSeedPlanes));
2536 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2537 continue;
2538 }
2539
2540 // temporary exit door for the HLT
4302c900 2541 if(fReconstructor->IsHLT()){
be24510a 2542 // attach clusters to extrapolation chambers
2543 for(int iLayer=0; iLayer<kNPlanes-kNSeedPlanes; iLayer++){
2544 Int_t jLayer = planesExt[iLayer];
2545 if(!(chamber = stack[jLayer])) continue;
f29f13a6 2546 cseed[jLayer].AttachClusters(chamber, kTRUE);
be24510a 2547 }
4302c900 2548 fTrackQuality[ntracks] = 1.; // dummy value
2549 ntracks++;
218ba867 2550 if(ntracks == kMaxTracksStack) return ntracks;
4302c900 2551 cseed += 6;
2552 continue;
2553 }
2554
be24510a 2555
f29f13a6 2556 // Update Seeds and calculate Likelihood
d611c74f 2557 // fit tracklets and cook likelihood
f29f13a6 2558 FitTiltedRieman(&cseed[0], kTRUE);
2559 for(int iLayer=0; iLayer<kNSeedPlanes; iLayer++){
2560 Int_t jLayer = planes[iLayer];
2561 cseed[jLayer].Fit(kTRUE);
2562 }
91834b8d 2563 Double_t like = CookLikelihood(&cseed[0], planes); // to be checked
d611c74f 2564
3a039a31 2565 if (TMath::Log(1.E-9 + like) < fReconstructor->GetRecoParam() ->GetTrackLikelihood()){
d611c74f 2566 //AliInfo(Form("Failed likelihood %f[%e].", TMath::Log(1.E-9 + like), like));
2567 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2568 continue;
2569 }
2570 //AliInfo(Form("Passed likelihood %f[%e].", TMath::Log(1.E-9 + like), like));
2571
2572 // book preliminary results
2573 seedQuality[ntracks] = like;
2574 fSeedLayer[ntracks] = config;/*sLayer;*/
2575
2576 // attach clusters to the extrapolation seeds
be24510a 2577 for(int iLayer=0; iLayer<kNPlanes-kNSeedPlanes; iLayer++){
2578 Int_t jLayer = planesExt[iLayer];
d611c74f 2579 if(!(chamber = stack[jLayer])) continue;
d611c74f 2580
2581 // fit extrapolated seed
2582 if ((jLayer == 0) && !(cseed[1].IsOK())) continue;
2583 if ((jLayer == 5) && !(cseed[4].IsOK())) continue;
2584 AliTRDseedV1 pseed = cseed[jLayer];
f29f13a6 2585 if(!pseed.AttachClusters(chamber, kTRUE)) continue;
2586 pseed.Fit(kTRUE);
d611c74f 2587 cseed[jLayer] = pseed;
d611c74f 2588 FitTiltedRieman(cseed, kTRUE);
f29f13a6 2589 cseed[jLayer].Fit(kTRUE);
d611c74f 2590 }
2591
2592 // AliInfo("Extrapolation done.");
2593 // Debug Stream containing all the 6 tracklets
3a039a31 2594 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){
29f95561 2595 TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
d611c74f 2596 TLinearFitter *tiltedRieman = GetTiltedRiemanFitter();
2597 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2598 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2599 cstreamer << "MakeSeeds1"
2600 << "EventNumber=" << eventNumber
2601 << "CandidateNumber=" << candidateNumber
2602 << "S0.=" << &cseed[0]
2603 << "S1.=" << &cseed[1]
2604 << "S2.=" << &cseed[2]
2605 << "S3.=" << &cseed[3]
2606 << "S4.=" << &cseed[4]
2607 << "S5.=" << &cseed[5]
2608 << "FitterT.=" << tiltedRieman
2609 << "\n";
2610 }
2611
fb872574 2612 if(fReconstructor->GetRecoParam()->HasImproveTracklets() && ImproveSeedQuality(stack, cseed) < 4){
d611c74f 2613 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2614 continue;
2615 }
2616 //AliInfo("Improve seed quality done.");
2617
2618 // fit full track and cook likelihoods
2619 // Double_t curv = FitRieman(&cseed[0], chi2);
2620 // Double_t chi2ZF = chi2[0] / TMath::Max((mlayers - 3.), 1.);
2621 // Double_t chi2RF = chi2[1] / TMath::Max((mlayers - 3.), 1.);
2622
2623 // do the final track fitting (Once with vertex constraint and once without vertex constraint)
2624 Double_t chi2Vals[3];
2625 chi2Vals[0] = FitTiltedRieman(&cseed[0], kFALSE);
91834b8d 2626 if(fReconstructor->GetRecoParam()->IsVertexConstrained())
d611c74f 2627 chi2Vals[1] = FitTiltedRiemanConstraint(&cseed[0], GetZ()); // Do Vertex Constrained fit if desired
2628 else
2629 chi2Vals[1] = 1.;
2630 chi2Vals[2] = GetChi2Z(&cseed[0]) / TMath::Max((mlayers - 3.), 1.);
2631 // Chi2 definitions in testing stage
2632 //chi2Vals[2] = GetChi2ZTest(&cseed[0]);
2633 fTrackQuality[ntracks] = CalculateTrackLikelihood(&cseed[0], &chi2Vals[0]);
2634 //AliInfo("Hyperplane fit done\n");
fac58f00 2635
3a039a31 2636 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){
29f95561 2637 TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
d611c74f 2638 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2639 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2640 TLinearFitter *fitterTC = GetTiltedRiemanFitterConstraint();
2641 TLinearFitter *fitterT = GetTiltedRiemanFitter();
91834b8d 2642 Int_t ncls = 0;
2643 for(Int_t iseed = 0; iseed < kNPlanes; iseed++){
2644 ncls += cseed[iseed].IsOK() ? cseed[iseed].GetN2() : 0;
2645 }
d611c74f 2646 cstreamer << "MakeSeeds2"
2647 << "EventNumber=" << eventNumber
2648 << "CandidateNumber=" << candidateNumber
2649 << "Chi2TR=" << chi2Vals[0]
2650 << "Chi2TC=" << chi2Vals[1]
2651 << "Nlayers=" << mlayers
91834b8d 2652 << "NClusters=" << ncls
d611c74f 2653 << "Like=" << like
2654 << "S0.=" << &cseed[0]
2655 << "S1.=" << &cseed[1]
2656 << "S2.=" << &cseed[2]
2657 << "S3.=" << &cseed[3]
2658 << "S4.=" << &cseed[4]
2659 << "S5.=" << &cseed[5]
d611c74f 2660 << "FitterT.=" << fitterT
2661 << "FitterTC.=" << fitterTC
2662 << "\n";
2663 }
2664
2665 ntracks++;
2666 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2667 if(ntracks == kMaxTracksStack){
2668 AliWarning(Form("Number of seeds reached maximum allowed (%d) in stack.", kMaxTracksStack));
2669 return ntracks;
2670 }
2671 cseed += 6;
41702fec 2672 }
2673 }
2674 }
41702fec 2675
2676 return ntracks;
e4f2f73d 2677}
2678
2679//_____________________________________________________________________________
0906e73e 2680AliTRDtrackV1* AliTRDtrackerV1::MakeTrack(AliTRDseedV1 *seeds, Double_t *params)
e4f2f73d 2681{
41702fec 2682 //
2683 // Build a TRD track out of tracklet candidates
2684 //
2685 // Parameters :
2686 // seeds : array of tracklets
2687 // params : track parameters (see MakeSeeds() function body for a detailed description)
2688 //
2689 // Output :
2690 // The TRD track.
2691 //
2692 // Detailed description
2693 //
2694 // To be discussed with Marian !!
2695 //
2696
41702fec 2697
2698 Double_t alpha = AliTRDgeometry::GetAlpha();
2699 Double_t shift = AliTRDgeometry::GetAlpha()/2.0;
2700 Double_t c[15];
2701
2702 c[ 0] = 0.2;
2703 c[ 1] = 0.0; c[ 2] = 2.0;
2704 c[ 3] = 0.0; c[ 4] = 0.0; c[ 5] = 0.02;
2705 c[ 6] = 0.0; c[ 7] = 0.0; c[ 8] = 0.0; c[ 9] = 0.1;
2706 c[10] = 0.0; c[11] = 0.0; c[12] = 0.0; c[13] = 0.0; c[14] = params[5]*params[5]*0.01;
2707
d20df6fc 2708 AliTRDtrackV1 track(seeds, &params[1], c, params[0], params[6]*alpha+shift);
2709 track.PropagateTo(params[0]-5.0);
f29f13a6 2710 AliTRDseedV1 *ptrTracklet = 0x0;
2711 // Sign clusters
2712 for (Int_t jLayer = 0; jLayer < AliTRDgeometry::kNlayer; jLayer++) {
2713 ptrTracklet = &seeds[jLayer];
2714 if(!ptrTracklet->IsOK()) continue;
2715 if(TMath::Abs(ptrTracklet->GetYref(1) - ptrTracklet->GetYfit(1)) >= .2) continue; // check this condition with Marian
2716 }
2717 //
91834b8d 2718 if(fReconstructor->IsHLT()){
91834b8d 2719 for(Int_t ip=0; ip<kNPlanes; ip++){
2720 track.UnsetTracklet(ip);
2721 ptrTracklet = SetTracklet(&seeds[ip]);
f29f13a6 2722 ptrTracklet->UseClusters();
91834b8d 2723 track.SetTracklet(ptrTracklet, fTracklets->GetEntriesFast()-1);
2724 }
d78d7df0 2725 AliTRDtrackV1 *ptrTrack = SetTrack(&track);
2726 ptrTrack->SetReconstructor(fReconstructor);
2727 return ptrTrack;
91834b8d 2728 }
393fda1c 2729
d20df6fc 2730 track.ResetCovariance(1);
e79f8eb0 2731 Int_t nc = TMath::Abs(FollowBackProlongation(track));
393fda1c 2732 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 5){
2733 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2734 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2735 Double_t p[5]; // Track Params for the Debug Stream
2736 track.GetExternalParameters(params[0], p);
29f95561 2737 TTreeSRedirector &cs = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
393fda1c 2738 cs << "MakeTrack"
2739 << "EventNumber=" << eventNumber
2740 << "CandidateNumber=" << candidateNumber
2741 << "nc=" << nc
2742 << "X=" << params[0]
2743 << "Y=" << p[0]
2744 << "Z=" << p[1]
2745 << "snp=" << p[2]
2746 << "tnd=" << p[3]
2747 << "crv=" << p[4]
2748 << "Yin=" << params[1]
2749 << "Zin=" << params[2]
2750 << "snpin=" << params[3]
2751 << "tndin=" << params[4]
2752 << "crvin=" << params[5]
2753 << "track.=" << &track
2754 << "\n";
2755 }
d20df6fc 2756 if (nc < 30) return 0x0;
2757
2758 AliTRDtrackV1 *ptrTrack = SetTrack(&track);
215f7116 2759 ptrTrack->SetReconstructor(fReconstructor);
48f8adf3 2760 ptrTrack->CookLabel(.9);
24253b0a 2761
d20df6fc 2762 // computes PID for track
2763 ptrTrack->CookPID();
2764 // update calibration references using this track
48f8adf3 2765 AliTRDCalibraFillHisto *calibra = AliTRDCalibraFillHisto::Instance();
2766 if (!calibra){
2767 AliInfo("Could not get Calibra instance\n");
2768 if(calibra->GetHisto2d()) calibra->UpdateHistogramsV1(ptrTrack);
2769 }
d20df6fc 2770 return ptrTrack;
e4f2f73d 2771}
2772
0906e73e 2773
2774//____________________________________________________________________
eb38ed55 2775Int_t AliTRDtrackerV1::ImproveSeedQuality(AliTRDtrackingChamber **stack, AliTRDseedV1 *cseed)
e4f2f73d 2776{
41702fec 2777 //
2778 // Sort tracklets according to "quality" and try to "improve" the first 4 worst
2779 //
2780 // Parameters :
2781 // layers : Array of propagation layers for a stack/supermodule
2782 // cseed : Array of 6 seeding tracklets which has to be improved
2783 //
f29f13a6 2784 // Output :
41702fec 2785 // cssed : Improved seeds
2786 //
2787 // Detailed description
2788 //
2789 // Iterative procedure in which new clusters are searched for each
2790 // tracklet seed such that the seed quality (see AliTRDseed::GetQuality())
2791 // can be maximized. If some optimization is found the old seeds are replaced.
2792 //
2793 // debug level: 7
2794 //
2795
2796 // make a local working copy
2797 AliTRDtrackingChamber *chamber = 0x0;
2798 AliTRDseedV1 bseed[6];
2799 Int_t nLayers = 0;
2800 for (Int_t jLayer = 0; jLayer < 6; jLayer++) bseed[jLayer] = cseed[jLayer];
2801
2802 Float_t lastquality = 10000.0;
2803 Float_t lastchi2 = 10000.0;
2804 Float_t chi2 = 1000.0;
2805
2806 for (Int_t iter = 0; iter < 4; iter++) {
2807 Float_t sumquality = 0.0;
2808 Float_t squality[6];
2809 Int_t sortindexes[6];
2810
2811 for (Int_t jLayer = 0; jLayer < 6; jLayer++) {
3a039a31 2812 squality[jLayer] = bseed[jLayer].IsOK() ? bseed[jLayer].GetQuality(kTRUE) : 1000.;
41702fec 2813 sumquality += squality[jLayer];
2814 }
2815 if ((sumquality >= lastquality) || (chi2 > lastchi2)) break;
2816
2817 nLayers = 0;
2818 lastquality = sumquality;
2819 lastchi2 = chi2;
2820 if (iter > 0) for (Int_t jLayer = 0; jLayer < 6; jLayer++) cseed[jLayer] = bseed[jLayer];
2821
2822 TMath::Sort(6, squality, sortindexes, kFALSE);
2823 for (Int_t jLayer = 5; jLayer > 1; jLayer--) {
2824 Int_t bLayer = sortindexes[jLayer];
2825 if(!(chamber = stack[bLayer])) continue;
f29f13a6 2826 bseed[bLayer].AttachClusters(chamber, kTRUE);
2827 bseed[bLayer].Fit(kTRUE);
41702fec 2828 if(bseed[bLayer].IsOK()) nLayers++;
2829 }
2830
2831 chi2 = FitTiltedRieman(bseed, kTRUE);
3a039a31 2832 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 7){
41702fec 2833 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2834 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2835 TLinearFitter *tiltedRieman = GetTiltedRiemanFitter();
29f95561 2836 TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
41702fec 2837 cstreamer << "ImproveSeedQuality"
2838 << "EventNumber=" << eventNumber
2839 << "CandidateNumber=" << candidateNumber
2840 << "Iteration=" << iter
2841 << "S0.=" << &bseed[0]
2842 << "S1.=" << &bseed[1]
2843 << "S2.=" << &bseed[2]
2844 << "S3.=" << &bseed[3]
2845 << "S4.=" << &bseed[4]
2846 << "S5.=" << &bseed[5]
2847 << "FitterT.=" << tiltedRieman
2848 << "\n";
2849 }
2850 } // Loop: iter
41702fec 2851 // we are sure that at least 2 tracklets are OK !
2852 return nLayers+2;
e4f2f73d 2853}
2854
eb38ed55 2855//_________________________________________________________________________
2856Double_t AliTRDtrackerV1::CalculateTrackLikelihood(AliTRDseedV1 *tracklets, Double_t *chi2){
41702fec 2857 //
2858 // Calculates the Track Likelihood value. This parameter serves as main quality criterion for
2859 // the track selection
2860 // The likelihood value containes:
2861 // - The chi2 values from the both fitters and the chi2 values in z-direction from a linear fit
2862 // - The Sum of the Parameter |slope_ref - slope_fit|/Sigma of the tracklets
2863 // For all Parameters an exponential dependency is used
2864 //
2865 // Parameters: - Array of tracklets (AliTRDseedV1) related to the track candidate
2866 // - Array of chi2 values:
2867 // * Non-Constrained Tilted Riemann fit
2868 // * Vertex-Constrained Tilted Riemann fit
2869 // * z-Direction from Linear fit
2870 // Output: - The calculated track likelihood
2871 //
2872 // debug level 2
2873 //
2874
f29f13a6 2875 Double_t chi2phi = 0, nLayers = 0;
41702fec 2876 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
2877 if(!tracklets[iLayer].IsOK()) continue;
f29f13a6 2878 chi2phi += tracklets[iLayer].GetChi2Phi();
41702fec 2879 nLayers++;
2880 }
f29f13a6 2881 chi2phi /= Float_t (nLayers - 2.0);
41702fec 2882
2883 Double_t likeChi2Z = TMath::Exp(-chi2[2] * 0.14); // Chi2Z
3a039a31 2884 Double_t likeChi2TC = (fReconstructor->GetRecoParam() ->IsVertexConstrained()) ?
d20df6fc 2885 TMath::Exp(-chi2[1] * 0.677) : 1; // Constrained Tilted Riemann
41702fec 2886 Double_t likeChi2TR = TMath::Exp(-chi2[0] * 0.78); // Non-constrained Tilted Riemann
f29f13a6 2887 Double_t likeChi2Phi= TMath::Exp(-chi2phi * 3.23);
2888 Double_t trackLikelihood = likeChi2Z * likeChi2TR * likeChi2Phi;
41702fec 2889
3a039a31 2890 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){
41702fec 2891 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2892 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
29f95561 2893 TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
41702fec 2894 cstreamer << "CalculateTrackLikelihood0"
2895 << "EventNumber=" << eventNumber
2896 << "CandidateNumber=" << candidateNumber
2897 << "LikeChi2Z=" << likeChi2Z
2898 << "LikeChi2TR=" << likeChi2TR
2899 << "LikeChi2TC=" << likeChi2TC
f29f13a6 2900 << "LikeChi2Phi=" << likeChi2Phi
41702fec 2901 << "TrackLikelihood=" << trackLikelihood
2902 << "\n";
2903 }
2904
2905 return trackLikelihood;
e4f2f73d 2906}
2907
2908//____________________________________________________________________
91834b8d 2909Double_t AliTRDtrackerV1::CookLikelihood(AliTRDseedV1 *cseed, Int_t planes[4])
e4f2f73d 2910{
41702fec 2911 //
2912 // Calculate the probability of this track candidate.
2913 //
2914 // Parameters :
2915 // cseeds : array of candidate tracklets
2916 // planes : array of seeding planes (see seeding configuration)
2917 // chi2 : chi2 values (on the Z and Y direction) from the rieman fit of the track.
2918 //
2919 // Output :
2920 // likelihood value
2921 //
2922 // Detailed description
2923 //
2924 // The track quality is estimated based on the following 4 criteria:
2925 // 1. precision of the rieman fit on the Y direction (likea)
2926 // 2. chi2 on the Y direction (likechi2y)
2927 // 3. chi2 on the Z direction (likechi2z)
2928 // 4. number of attached clusters compared to a reference value
2929 // (see AliTRDrecoParam::fkFindable) (likeN)
2930 //
2931 // The distributions for each type of probabilities are given below as of
2932 // (date). They have to be checked to assure consistency of estimation.
2933 //
2934
2935 // ratio of the total number of clusters/track which are expected to be found by the tracker.
91834b8d 2936 const AliTRDrecoParam *fRecoPars = fReconstructor->GetRecoParam();
41702fec 2937
91834b8d 2938 Double_t chi2y = GetChi2Y(&cseed[0]);
2939 Double_t chi2z = GetChi2Z(&cseed[0]);
2940
8ae98148 2941 Float_t nclusters = 0.;
41702fec 2942 Double_t sumda = 0.;
2943 for(UChar_t ilayer = 0; ilayer < 4; ilayer++){
2944 Int_t jlayer = planes[ilayer];
2945 nclusters += cseed[jlayer].GetN2();
e3cf3d02 2946 sumda += TMath::Abs(cseed[jlayer].GetYfit(1) - cseed[jlayer].GetYref(1));
41702fec 2947 }
8ae98148 2948 nclusters *= .25;
2949
5a2e200c 2950 Double_t likea = TMath::Exp(-sumda * fRecoPars->GetPhiSlope());
41702fec 2951 Double_t likechi2y = 0.0000000001;
5a2e200c 2952 if (fReconstructor->IsCosmic() || chi2y < fRecoPars->GetChi2YCut()) likechi2y += TMath::Exp(-TMath::Sqrt(chi2y) * fRecoPars->GetChi2YSlope());
2953 Double_t likechi2z = TMath::Exp(-chi2z * fRecoPars->GetChi2ZSlope());
8ae98148 2954 Double_t likeN = TMath::Exp(-(fRecoPars->GetNMeanClusters() - nclusters) / fRecoPars->GetNSigmaClusters());
41702fec 2955 Double_t like = likea * likechi2y * likechi2z * likeN;
2956
2957 // AliInfo(Form("sumda(%f) chi2[0](%f) chi2[1](%f) likea(%f) likechi2y(%f) likechi2z(%f) nclusters(%d) likeN(%f)", sumda, chi2[0], chi2[1], likea, likechi2y, likechi2z, nclusters, likeN));
3a039a31 2958 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){
41702fec 2959 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2960 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
91834b8d 2961 Int_t nTracklets = 0; Float_t mean_ncls = 0;
2962 for(Int_t iseed=0; iseed < kNPlanes; iseed++){
2963 if(!cseed[iseed].IsOK()) continue;
2964 nTracklets++;
2965 mean_ncls += cseed[iseed].GetN2();
2966 }
2967 if(nTracklets) mean_ncls /= nTracklets;
41702fec 2968 // The Debug Stream contains the seed
29f95561 2969 TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
41702fec 2970 cstreamer << "CookLikelihood"
2971 << "EventNumber=" << eventNumber
2972 << "CandidateNumber=" << candidateNumber
2973 << "tracklet0.=" << &cseed[0]
2974 << "tracklet1.=" << &cseed[1]
2975 << "tracklet2.=" << &cseed[2]
2976 << "tracklet3.=" << &cseed[3]
2977 << "tracklet4.=" << &cseed[4]
2978 << "tracklet5.=" << &cseed[5]
2979 << "sumda=" << sumda
91834b8d 2980 << "chi2y=" << chi2y
2981 << "chi2z=" << chi2z
41702fec 2982 << "likea=" << likea
2983 << "likechi2y=" << likechi2y
2984 << "likechi2z=" << likechi2z
2985 << "nclusters=" << nclusters
2986 << "likeN=" << likeN
2987 << "like=" << like
91834b8d 2988 << "meanncls=" << mean_ncls
41702fec 2989 << "\n";
2990 }
2991
2992 return like;
e4f2f73d 2993}
2994
e4f2f73d 2995//____________________________________________________________________
0906e73e 2996void AliTRDtrackerV1::GetSeedingConfig(Int_t iconfig, Int_t planes[4])
e4f2f73d 2997{
41702fec 2998 //
2999 // Map seeding configurations to detector planes.
3000 //
3001 // Parameters :
3002 // iconfig : configuration index
3003 // planes : member planes of this configuration. On input empty.
3004 //
3005 // Output :
3006 // planes : contains the planes which are defining the configuration
3007 //
3008 // Detailed description
3009 //
3010 // Here is the list of seeding planes configurations together with
3011 // their topological classification:
3012 //
3013 // 0 - 5432 TQ 0
3014 // 1 - 4321 TQ 0
3015 // 2 - 3210 TQ 0
3016 // 3 - 5321 TQ 1
3017 // 4 - 4210 TQ 1
3018 // 5 - 5431 TQ 1
3019 // 6 - 4320 TQ 1
3020 // 7 - 5430 TQ 2
3021 // 8 - 5210 TQ 2
3022 // 9 - 5421 TQ 3
3023 // 10 - 4310 TQ 3
3024 // 11 - 5410 TQ 4
3025 // 12 - 5420 TQ 5
3026 // 13 - 5320 TQ 5
3027 // 14 - 5310 TQ 5
3028 //
3029 // The topologic quality is modeled as follows:
3030 // 1. The general model is define by the equation:
3031 // p(conf) = exp(-conf/2)
3032 // 2. According to the topologic classification, configurations from the same
3033 // class are assigned the agerage value over the model values.
3034 // 3. Quality values are normalized.
3035 //
3036 // The topologic quality distribution as function of configuration is given below:
3037 //Begin_Html
3038 // <img src="gif/topologicQA.gif">
3039 //End_Html
3040 //
3041
3042 switch(iconfig){
3043 case 0: // 5432 TQ 0
3044 planes[0] = 2;
3045 planes[1] = 3;
3046 planes[2] = 4;
3047 planes[3] = 5;
3048 break;
3049 case 1: // 4321 TQ 0
3050 planes[0] = 1;
3051 planes[1] = 2;
3052 planes[2] = 3;
3053 planes[3] = 4;
3054 break;
3055 case 2: // 3210 TQ 0
3056 planes[0] = 0;
3057 planes[1] = 1;
3058 planes[2] = 2;
3059 planes[3] = 3;
3060 break;
3061 case 3: // 5321 TQ 1
3062 planes[0] = 1;
3063 planes[1] = 2;
3064 planes[2] = 3;
3065 planes[3] = 5;
3066 break;
3067 case 4: // 4210 TQ 1
3068 planes[0] = 0;
3069 planes[1] = 1;
3070 planes[2] = 2;
3071 planes[3] = 4;
3072 break;
3073 case 5: // 5431 TQ 1
3074 planes[0] = 1;
3075 planes[1] = 3;
3076 planes[2] = 4;
3077 planes[3] = 5;
3078 break;
3079 case 6: // 4320 TQ 1
3080 planes[0] = 0;
3081 planes[1] = 2;
3082 planes[2] = 3;
3083 planes[3] = 4;
3084 break;
3085 case 7: // 5430 TQ 2
3086 planes[0] = 0;
3087 planes[1] = 3;
3088 planes[2] = 4;
3089 planes[3] = 5;
3090 break;
3091 case 8: // 5210 TQ 2
3092 planes[0] = 0;
3093 planes[1] = 1;
3094 planes[2] = 2;
3095 planes[3] = 5;
3096 break;
3097 case 9: // 5421 TQ 3
3098 planes[0] = 1;
3099 planes[1] = 2;
3100 planes[2] = 4;
3101 planes[3] = 5;
3102 break;
3103 case 10: // 4310 TQ 3
3104 planes[0] = 0;
3105 planes[1] = 1;
3106 planes[2] = 3;
3107 planes[3] = 4;
3108 break;
3109 case 11: // 5410 TQ 4
3110 planes[0] = 0;
3111 planes[1] = 1;
3112 planes[2] = 4;
3113 planes[3] = 5;
3114 break;
3115 case 12: // 5420 TQ 5
3116 planes[0] = 0;
3117 planes[1] = 2;
3118 planes[2] = 4;
3119 planes[3] = 5;
3120 break;
3121 case 13: // 5320 TQ 5
3122 planes[0] = 0;
3123 planes[1] = 2;
3124 planes[2] = 3;
3125 planes[3] = 5;
3126 break;
3127 case 14: // 5310 TQ 5
3128 planes[0] = 0;
3129 planes[1] = 1;
3130 planes[2] = 3;
3131 planes[3] = 5;
3132 break;
3133 }
e4f2f73d 3134}
3135
3136//____________________________________________________________________
0906e73e 3137void AliTRDtrackerV1::GetExtrapolationConfig(Int_t iconfig, Int_t planes[2])
e4f2f73d 3138{
41702fec 3139 //
3140 // Returns the extrapolation planes for a seeding configuration.
3141 //
3142 // Parameters :
3143 // iconfig : configuration index
3144 // planes : planes which are not in this configuration. On input empty.
3145 //
3146 // Output :
3147 // planes : contains the planes which are not in the configuration
3148 //
3149 // Detailed description
3150 //
3151
3152 switch(iconfig){
3153 case 0: // 5432 TQ 0
3154 planes[0] = 1;
3155 planes[1] = 0;
3156 break;
3157 case 1: // 4321 TQ 0
3158 planes[0] = 5;
3159 planes[1] = 0;
3160 break;
3161 case 2: // 3210 TQ 0
3162 planes[0] = 4;
3163 planes[1] = 5;
3164 break;
3165 case 3: // 5321 TQ 1
3166 planes[0] = 4;
3167 planes[1] = 0;
3168 break;
3169 case 4: // 4210 TQ 1
3170 planes[0] = 5;
3171 planes[1] = 3;
3172 break;
3173 case 5: // 5431 TQ 1
3174 planes[0] = 2;
3175 planes[1] = 0;
3176 break;
3177 case 6: // 4320 TQ 1
3178 planes[0] = 5;
3179 planes[1] = 1;
3180 break;
3181 case 7: // 5430 TQ 2
3182 planes[0] = 2;
3183 planes[1] = 1;
3184 break;
3185 case 8: // 5210 TQ 2
3186 planes[0] = 4;
3187 planes[1] = 3;
3188 break;
3189 case 9: // 5421 TQ 3
3190 planes[0] = 3;
3191 planes[1] = 0;
3192 break;
3193 case 10: // 4310 TQ 3
3194 planes[0] = 5;
3195 planes[1] = 2;
3196 break;
3197 case 11: // 5410 TQ 4
3198 planes[0] = 3;
3199 planes[1] = 2;
3200 break;
3201 case 12: // 5420 TQ 5
3202 planes[0] = 3;
3203 planes[1] = 1;
3204 break;
3205 case 13: // 5320 TQ 5
3206 planes[0] = 4;
3207 planes[1] = 1;
3208 break;
3209 case 14: // 5310 TQ 5
3210 planes[0] = 4;
3211 planes[1] = 2;
3212 break;
3213 }
e4f2f73d 3214}
eb38ed55 3215
3216//____________________________________________________________________
3217AliCluster* AliTRDtrackerV1::GetCluster(Int_t idx) const
3218{
41702fec 3219 Int_t ncls = fClusters->GetEntriesFast();
2f7514a6 3220 return idx >= 0 && idx < ncls ? (AliCluster*)fClusters->UncheckedAt(idx) : 0x0;
eb38ed55 3221}
3222
bb56afff 3223//____________________________________________________________________
3b57a3f7 3224AliTRDseedV1* AliTRDtrackerV1::GetTracklet(Int_t idx) const
3225{
41702fec 3226 Int_t ntrklt = fTracklets->GetEntriesFast();
2f7514a6 3227 return idx >= 0 && idx < ntrklt ? (AliTRDseedV1*)fTracklets->UncheckedAt(idx) : 0x0;
3b57a3f7 3228}
3229
3230//____________________________________________________________________
3231AliKalmanTrack* AliTRDtrackerV1::GetTrack(Int_t idx) const
3232{
41702fec 3233 Int_t ntrk = fTracks->GetEntriesFast();
2f7514a6 3234 return idx >= 0 && idx < ntrk ? (AliKalmanTrack*)fTracks->UncheckedAt(idx) : 0x0;
3b57a3f7 3235}
3236
3237//____________________________________________________________________
bb56afff 3238Float_t AliTRDtrackerV1::CalculateReferenceX(AliTRDseedV1 *tracklets){
41702fec 3239 //
3240 // Calculates the reference x-position for the tilted Rieman fit defined as middle
3241 // of the stack (middle between layers 2 and 3). For the calculation all the tracklets
3242 // are taken into account
3243 //
3244 // Parameters: - Array of tracklets(AliTRDseedV1)
3245 //
3246 // Output: - The reference x-position(Float_t)
3247 //
3248 Int_t nDistances = 0;
3249 Float_t meanDistance = 0.;
3250 Int_t startIndex = 5;
3251 for(Int_t il =5; il > 0; il--){
3252 if(tracklets[il].IsOK() && tracklets[il -1].IsOK()){
3253 Float_t xdiff = tracklets[il].GetX0() - tracklets[il -1].GetX0();
3254 meanDistance += xdiff;
3255 nDistances++;
3256 }
3257 if(tracklets[il].IsOK()) startIndex = il;
3258 }
3259 if(tracklets[0].IsOK()) startIndex = 0;
3260 if(!nDistances){
3261 // We should normally never get here
3262 Float_t xpos[2]; memset(xpos, 0, sizeof(Float_t) * 2);
3263 Int_t iok = 0, idiff = 0;
3264 // This attempt is worse and should be avoided:
3265 // check for two chambers which are OK and repeat this without taking the mean value
3266 // Strategy avoids a division by 0;
3267 for(Int_t il = 5; il >= 0; il--){
3268 if(tracklets[il].IsOK()){
3269 xpos[iok] = tracklets[il].GetX0();
3270 iok++;
3271 startIndex = il;
3272 }
3273 if(iok) idiff++; // to get the right difference;
3274 if(iok > 1) break;
3275 }
3276 if(iok > 1){
3277 meanDistance = (xpos[0] - xpos[1])/idiff;
3278 }
3279 else{
3280 // we have do not even have 2 layers which are OK? The we do not need to fit at all
3281 return 331.;
3282 }
3283 }
3284 else{
3285 meanDistance /= nDistances;
3286 }
3287 return tracklets[startIndex].GetX0() + (2.5 - startIndex) * meanDistance - 0.5 * (AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick());
bb56afff 3288}
eb38ed55 3289
fac58f00 3290// //_____________________________________________________________________________
3291// Int_t AliTRDtrackerV1::Freq(Int_t n, const Int_t *inlist
3292// , Int_t *outlist, Bool_t down)
3293// {
3294// //
3295// // Sort eleements according occurancy
3296// // The size of output array has is 2*n
3297// //
3298//
3299// if (n <= 0) {
3300// return 0;
3301// }
3302//
3303// Int_t *sindexS = new Int_t[n]; // Temporary array for sorting
3304// Int_t *sindexF = new Int_t[2*n];
3305// for (Int_t i = 0; i < n; i++) {
3306// sindexF[i] = 0;
3307// }
3308//
3309// TMath::Sort(n,inlist,sindexS,down);
3310//
3311// Int_t last = inlist[sindexS[0]];
3312// Int_t val = last;
3313// sindexF[0] = 1;
3314// sindexF[0+n] = last;
3315// Int_t countPos = 0;
3316//
3317// // Find frequency
3318// for (Int_t i = 1; i < n; i++) {
3319// val = inlist[sindexS[i]];
3320// if (last == val) {
3321// sindexF[countPos]++;
3322// }
3323// else {
3324// countPos++;
3325// sindexF[countPos+n] = val;
3326// sindexF[countPos]++;
3327// last = val;
3328// }
3329// }
3330// if (last == val) {
3331// countPos++;
3332// }
3333//
3334// // Sort according frequency
3335// TMath::Sort(countPos,sindexF,sindexS,kTRUE);
3336//
3337// for (Int_t i = 0; i < countPos; i++) {
3338// outlist[2*i ] = sindexF[sindexS[i]+n];
3339// outlist[2*i+1] = sindexF[sindexS[i]];
3340// }
3341//
3342// delete [] sindexS;
3343// delete [] sindexF;
3344//
3345// return countPos;
3346//
3347// }
bb56afff 3348
06b32d95 3349
3350//____________________________________________________________________
d611c74f 3351void AliTRDtrackerV1::ResetSeedTB()
3352{
3353// reset buffer for seeding time bin layers. If the time bin
3354// layers are not allocated this function allocates them
3355
3356 for(Int_t isl=0; isl<kNSeedPlanes; isl++){
3357 if(!fSeedTB[isl]) fSeedTB[isl] = new AliTRDchamberTimeBin();
3358 else fSeedTB[isl]->Clear();
3359 }
3360}
3361
e3cf3d02 3362
3363//_____________________________________________________________________________
3364Float_t AliTRDtrackerV1::GetChi2Y(AliTRDseedV1 *tracklets) const
3365{
3366 // Calculates normalized chi2 in y-direction
3367 // chi2 = Sum chi2 / n_tracklets
3368
3369 Double_t chi2 = 0.; Int_t n = 0;
3370 for(Int_t ipl = kNPlanes; ipl--;){
3371 if(!tracklets[ipl].IsOK()) continue;
3372 chi2 += tracklets[ipl].GetChi2Y();
3373 n++;
3374 }
3375 return n ? chi2/n : 0.;
3376}
3377
bb56afff 3378//_____________________________________________________________________________
3379Float_t AliTRDtrackerV1::GetChi2Z(AliTRDseedV1 *tracklets) const
3380{
91834b8d 3381 // Calculates normalized chi2 in z-direction
e3cf3d02 3382 // chi2 = Sum chi2 / n_tracklets
41702fec 3383
e3cf3d02 3384 Double_t chi2 = 0; Int_t n = 0;
3385 for(Int_t ipl = kNPlanes; ipl--;){
41702fec