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[u/mrichter/AliRoot.git] / TRD / AliTRDtrackerV1.cxx
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bcb6fb78 1
e4f2f73d 2/**************************************************************************
3 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * *
5 * Author: The ALICE Off-line Project. *
6 * Contributors are mentioned in the code where appropriate. *
7 * *
8 * Permission to use, copy, modify and distribute this software and its *
9 * documentation strictly for non-commercial purposes is hereby granted *
10 * without fee, provided that the above copyright notice appears in all *
11 * copies and that both the copyright notice and this permission notice *
12 * appear in the supporting documentation. The authors make no claims *
13 * about the suitability of this software for any purpose. It is *
14 * provided "as is" without express or implied warranty. *
15 **************************************************************************/
16
17/* $Id$ */
18
19///////////////////////////////////////////////////////////////////////////////
20// //
21// Track finder //
22// //
23// Authors: //
24// Alex Bercuci <A.Bercuci@gsi.de> //
25// Markus Fasel <M.Fasel@gsi.de> //
26// //
27///////////////////////////////////////////////////////////////////////////////
28
29#include <Riostream.h>
30#include <stdio.h>
31#include <string.h>
32
33#include <TBranch.h>
34#include <TFile.h>
35#include <TGraph.h>
36#include <TH1D.h>
37#include <TH2D.h>
38#include <TLinearFitter.h>
e4f2f73d 39#include <TROOT.h>
40#include <TTree.h>
41#include <TClonesArray.h>
42#include <TRandom.h>
43#include <TTreeStream.h>
44
45#include "AliLog.h"
46#include "AliESDEvent.h"
47#include "AliAlignObj.h"
48#include "AliRieman.h"
49#include "AliTrackPointArray.h"
50
e4f2f73d 51#include "AliTRDtrackerV1.h"
eb38ed55 52#include "AliTRDtrackingChamber.h"
e4f2f73d 53#include "AliTRDgeometry.h"
54#include "AliTRDpadPlane.h"
55#include "AliTRDgeometry.h"
56#include "AliTRDcluster.h"
57#include "AliTRDtrack.h"
58#include "AliTRDseed.h"
59#include "AliTRDcalibDB.h"
60#include "AliTRDCommonParam.h"
61#include "AliTRDReconstructor.h"
62#include "AliTRDCalibraFillHisto.h"
eb38ed55 63#include "AliTRDchamberTimeBin.h"
e4f2f73d 64#include "AliTRDrecoParam.h"
65#include "AliTRDseedV1.h"
0906e73e 66#include "AliTRDtrackV1.h"
67#include "Cal/AliTRDCalDet.h"
e4f2f73d 68
e4f2f73d 69
70ClassImp(AliTRDtrackerV1)
eb38ed55 71
72
73const Float_t AliTRDtrackerV1::fgkMinClustersInTrack = 0.5; //
74const Float_t AliTRDtrackerV1::fgkLabelFraction = 0.8; //
75const Double_t AliTRDtrackerV1::fgkMaxChi2 = 12.0; //
76const Double_t AliTRDtrackerV1::fgkMaxSnp = 0.95; // Maximum local sine of the azimuthal angle
77const Double_t AliTRDtrackerV1::fgkMaxStep = 2.0; // Maximal step size in propagation
d76231c8 78Double_t AliTRDtrackerV1::fgTopologicQA[kNConfigs] = {
e4f2f73d 79 0.1112, 0.1112, 0.1112, 0.0786, 0.0786,
80 0.0786, 0.0786, 0.0579, 0.0579, 0.0474,
81 0.0474, 0.0408, 0.0335, 0.0335, 0.0335
82};
2985ffcb 83Int_t AliTRDtrackerV1::fgNTimeBins = 0;
eb38ed55 84TTreeSRedirector *AliTRDtrackerV1::fgDebugStreamer = 0x0;
85AliRieman* AliTRDtrackerV1::fgRieman = 0x0;
86TLinearFitter* AliTRDtrackerV1::fgTiltedRieman = 0x0;
87TLinearFitter* AliTRDtrackerV1::fgTiltedRiemanConstrained = 0x0;
e4f2f73d 88
89//____________________________________________________________________
eb38ed55 90AliTRDtrackerV1::AliTRDtrackerV1()
91 :AliTracker()
92 ,fGeom(new AliTRDgeometry())
93 ,fClusters(0x0)
0906e73e 94 ,fTracklets(0x0)
eb38ed55 95 ,fTracks(0x0)
e4f2f73d 96 ,fSieveSeeding(0)
e4f2f73d 97{
98 //
eb38ed55 99 // Default constructor.
100 //
101 if (!AliTRDcalibDB::Instance()) {
102 AliFatal("Could not get calibration object");
103 }
2985ffcb 104 fgNTimeBins = AliTRDcalibDB::Instance()->GetNumberOfTimeBins();
e4f2f73d 105
2985ffcb 106 for (Int_t isector = 0; isector < AliTRDgeometry::kNsect; isector++) new(&fTrSec[isector]) AliTRDtrackingSector(fGeom, isector);
e4f2f73d 107
eb38ed55 108 if(AliTRDReconstructor::StreamLevel() > 1){
109 TDirectory *savedir = gDirectory;
110 fgDebugStreamer = new TTreeSRedirector("TRD.TrackerDebug.root");
111 savedir->cd();
112 }
113}
114
e4f2f73d 115//____________________________________________________________________
116AliTRDtrackerV1::~AliTRDtrackerV1()
117{
118 //
119 // Destructor
120 //
eb38ed55 121
122 if(fgDebugStreamer) delete fgDebugStreamer;
123 if(fgRieman) delete fgRieman;
124 if(fgTiltedRieman) delete fgTiltedRieman;
125 if(fgTiltedRiemanConstrained) delete fgTiltedRiemanConstrained;
126 if(fTracks) {fTracks->Delete(); delete fTracks;}
0906e73e 127 if(fTracklets) {fTracklets->Delete(); delete fTracklets;}
eb38ed55 128 if(fClusters) {fClusters->Delete(); delete fClusters;}
129 if(fGeom) delete fGeom;
e4f2f73d 130}
131
132//____________________________________________________________________
133Int_t AliTRDtrackerV1::Clusters2Tracks(AliESDEvent *esd)
134{
135 //
136 // Steering stand alone tracking for full TRD detector
137 //
138 // Parameters :
139 // esd : The ESD event. On output it contains
140 // the ESD tracks found in TRD.
141 //
142 // Output :
143 // Number of tracks found in the TRD detector.
144 //
145 // Detailed description
146 // 1. Launch individual SM trackers.
147 // See AliTRDtrackerV1::Clusters2TracksSM() for details.
148 //
149
eb38ed55 150 if(!AliTRDReconstructor::RecoParam()){
151 AliError("Reconstruction configuration not initialized. Call first AliTRDReconstructor::SetRecoParam().");
e4f2f73d 152 return 0;
153 }
154
155 //AliInfo("Start Track Finder ...");
156 Int_t ntracks = 0;
eb38ed55 157 for(int ism=0; ism<AliTRDgeometry::kNsect; ism++){
158// for(int ism=1; ism<2; ism++){
e4f2f73d 159 //AliInfo(Form("Processing supermodule %i ...", ism));
eb38ed55 160 ntracks += Clusters2TracksSM(ism, esd);
e4f2f73d 161 }
eb38ed55 162 AliInfo(Form("Number of found tracks : %d", ntracks));
e4f2f73d 163 return ntracks;
164}
165
0906e73e 166
167//_____________________________________________________________________________
eb38ed55 168Bool_t AliTRDtrackerV1::GetTrackPoint(Int_t index, AliTrackPoint &p) const
0906e73e 169{
170 //AliInfo(Form("Asking for tracklet %d", index));
171
172 if(index<0) return kFALSE;
eb38ed55 173 AliTRDseedV1 *tracklet = 0x0;
174 if(!(tracklet = (AliTRDseedV1*)fTracklets->UncheckedAt(index))) return kFALSE;
175
176 // get detector for this tracklet
177 AliTRDcluster *cl = 0x0;
178 Int_t ic = 0; do; while(!(cl = tracklet->GetClusters(ic++)));
179 Int_t idet = cl->GetDetector();
180
181 Double_t local[3];
182 local[0] = tracklet->GetX0();
183 local[1] = tracklet->GetYfit(0);
184 local[2] = tracklet->GetZfit(0);
185 Double_t global[3];
186 fGeom->RotateBack(idet, local, global);
187 p.SetXYZ(global[0],global[1],global[2]);
188
189
190 // setting volume id
191 AliGeomManager::ELayerID iLayer = AliGeomManager::kTRD1;
192 switch (fGeom->GetPlane(idet)) {
193 case 0:
194 iLayer = AliGeomManager::kTRD1;
195 break;
196 case 1:
197 iLayer = AliGeomManager::kTRD2;
198 break;
199 case 2:
200 iLayer = AliGeomManager::kTRD3;
201 break;
202 case 3:
203 iLayer = AliGeomManager::kTRD4;
204 break;
205 case 4:
206 iLayer = AliGeomManager::kTRD5;
207 break;
208 case 5:
209 iLayer = AliGeomManager::kTRD6;
210 break;
211 };
212 Int_t modId = fGeom->GetSector(idet) * fGeom->Ncham() + fGeom->GetChamber(idet);
213 UShort_t volid = AliGeomManager::LayerToVolUID(iLayer, modId);
214 p.SetVolumeID(volid);
215
0906e73e 216 return kTRUE;
217}
218
eb38ed55 219//____________________________________________________________________
220TLinearFitter* AliTRDtrackerV1::GetTiltedRiemanFitter()
221{
222 if(!fgTiltedRieman) fgTiltedRieman = new TLinearFitter(4, "hyp4");
223 return fgTiltedRieman;
224}
0906e73e 225
eb38ed55 226//____________________________________________________________________
227TLinearFitter* AliTRDtrackerV1::GetTiltedRiemanFitterConstraint()
228{
229 if(!fgTiltedRiemanConstrained) fgTiltedRiemanConstrained = new TLinearFitter(2, "hyp2");
230 return fgTiltedRiemanConstrained;
231}
232
233//____________________________________________________________________
234AliRieman* AliTRDtrackerV1::GetRiemanFitter()
235{
236 if(!fgRieman) fgRieman = new AliRieman(AliTRDtrackingChamber::kNTimeBins * AliTRDgeometry::kNplan);
237 return fgRieman;
238}
239
0906e73e 240//_____________________________________________________________________________
241Int_t AliTRDtrackerV1::PropagateBack(AliESDEvent *event)
242{
243 //
244 // Gets seeds from ESD event. The seeds are AliTPCtrack's found and
245 // backpropagated by the TPC tracker. Each seed is first propagated
246 // to the TRD, and then its prolongation is searched in the TRD.
247 // If sufficiently long continuation of the track is found in the TRD
248 // the track is updated, otherwise it's stored as originaly defined
249 // by the TPC tracker.
250 //
251
252 Int_t found = 0; // number of tracks found
253 Float_t foundMin = 20.0;
254
0906e73e 255 Int_t nSeed = event->GetNumberOfTracks();
256 if(!nSeed){
257 // run stand alone tracking
258 if (AliTRDReconstructor::SeedingOn()) Clusters2Tracks(event);
259 return 0;
260 }
261
262 Float_t *quality = new Float_t[nSeed];
263 Int_t *index = new Int_t[nSeed];
264 for (Int_t iSeed = 0; iSeed < nSeed; iSeed++) {
265 AliESDtrack *seed = event->GetTrack(iSeed);
266 Double_t covariance[15];
267 seed->GetExternalCovariance(covariance);
268 quality[iSeed] = covariance[0] + covariance[2];
269 }
270 // Sort tracks according to covariance of local Y and Z
271 TMath::Sort(nSeed,quality,index,kFALSE);
272
273 // Backpropagate all seeds
274 for (Int_t iSeed = 0; iSeed < nSeed; iSeed++) {
275
276 // Get the seeds in sorted sequence
277 AliESDtrack *seed = event->GetTrack(index[iSeed]);
278
279 // Check the seed status
280 ULong_t status = seed->GetStatus();
281 if ((status & AliESDtrack::kTPCout) == 0) continue;
282 if ((status & AliESDtrack::kTRDout) != 0) continue;
283
284 // Do the back prolongation
285 Int_t lbl = seed->GetLabel();
286 AliTRDtrackV1 *track = new AliTRDtrackV1(*seed);
287 //track->Print();
288 track->SetSeedLabel(lbl);
289 seed->UpdateTrackParams(track, AliESDtrack::kTRDbackup); // Make backup
0906e73e 290 Float_t p4 = track->GetC();
291 Int_t expectedClr = FollowBackProlongation(*track);
292 //AliInfo(Form("\nTRACK %d Clusters %d [%d] in chi2 %f", index[iSeed], expectedClr, track->GetNumberOfClusters(), track->GetChi2()));
293 //track->Print();
294
295 //Double_t cov[15];
296 //seed->GetExternalCovariance(cov);
297 //AliInfo(Form("track %d cov[%f %f] 0", index[iSeed], cov[0], cov[2]));
298
299 if ((TMath::Abs(track->GetC() - p4) / TMath::Abs(p4) < 0.2) ||
300 (track->Pt() > 0.8)) {
301 //
302 // Make backup for back propagation
303 //
304 Int_t foundClr = track->GetNumberOfClusters();
305 if (foundClr >= foundMin) {
306 //AliInfo(Form("Making backup track ncls [%d]...", foundClr));
307 track->CookdEdx();
308 track->CookdEdxTimBin(seed->GetID()); // A.Bercuci 25.07.07
309 CookLabel(track,1 - fgkLabelFraction);
310 if (track->GetBackupTrack()) UseClusters(track->GetBackupTrack());
311
312
313 //seed->GetExternalCovariance(cov);
314 //AliInfo(Form("track %d cov[%f %f] 0 test", index[iSeed], cov[0], cov[2]));
315
316 // Sign only gold tracks
317 if (track->GetChi2() / track->GetNumberOfClusters() < 4) {
318 if ((seed->GetKinkIndex(0) == 0) &&
319 (track->Pt() < 1.5)) UseClusters(track);
320 }
321 Bool_t isGold = kFALSE;
322
323 // Full gold track
324 if (track->GetChi2() / track->GetNumberOfClusters() < 5) {
325 if (track->GetBackupTrack()) seed->UpdateTrackParams(track->GetBackupTrack(),AliESDtrack::kTRDbackup);
326
327 isGold = kTRUE;
328 }
329 //seed->GetExternalCovariance(cov);
330 //AliInfo(Form("track %d cov[%f %f] 00", index[iSeed], cov[0], cov[2]));
331
332 // Almost gold track
333 if ((!isGold) && (track->GetNCross() == 0) &&
334 (track->GetChi2() / track->GetNumberOfClusters() < 7)) {
335 //seed->UpdateTrackParams(track, AliESDtrack::kTRDbackup);
336 if (track->GetBackupTrack()) seed->UpdateTrackParams(track->GetBackupTrack(),AliESDtrack::kTRDbackup);
337
338 isGold = kTRUE;
339 }
340 //seed->GetExternalCovariance(cov);
341 //AliInfo(Form("track %d cov[%f %f] 01", index[iSeed], cov[0], cov[2]));
342
343 if ((!isGold) && (track->GetBackupTrack())) {
344 if ((track->GetBackupTrack()->GetNumberOfClusters() > foundMin) && ((track->GetBackupTrack()->GetChi2()/(track->GetBackupTrack()->GetNumberOfClusters()+1)) < 7)) {
345 seed->UpdateTrackParams(track->GetBackupTrack(),AliESDtrack::kTRDbackup);
346 isGold = kTRUE;
347 }
348 }
349 //seed->GetExternalCovariance(cov);
350 //AliInfo(Form("track %d cov[%f %f] 02", index[iSeed], cov[0], cov[2]));
351
352 //if ((track->StatusForTOF() > 0) && (track->GetNCross() == 0) && (Float_t(track->GetNumberOfClusters()) / Float_t(track->GetNExpected()) > 0.4)) {
353 //seed->UpdateTrackParams(track->GetBackupTrack(), AliESDtrack::kTRDbackup);
354 //}
355 }
356 }
357 /**/
358
359 /**/
360 // Debug part of tracking
eb38ed55 361/* TTreeSRedirector &cstream = *fgDebugStreamer;
0906e73e 362 Int_t eventNrInFile = event->GetEventNumberInFile(); // This is most likely NOT the event number you'd like to use. It has nothing to do with the 'real' event number.
363 if (AliTRDReconstructor::StreamLevel() > 0) {
364 if (track->GetBackupTrack()) {
365 cstream << "Tracks"
366 << "EventNrInFile=" << eventNrInFile
367 << "ESD.=" << seed
368 << "trd.=" << track
369 << "trdback.=" << track->GetBackupTrack()
370 << "\n";
371 }
372 else {
373 cstream << "Tracks"
374 << "EventNrInFile=" << eventNrInFile
375 << "ESD.=" << seed
376 << "trd.=" << track
377 << "trdback.=" << track
378 << "\n";
379 }
380 }*/
381 /**/
382
383 //seed->GetExternalCovariance(cov);
384 //AliInfo(Form("track %d cov[%f %f] 1", index[iSeed], cov[0], cov[2]));
385
386 // Propagation to the TOF (I.Belikov)
387 if (track->GetStop() == kFALSE) {
388 //AliInfo("Track not stopped in TRD ...");
389 Double_t xtof = 371.0;
390 Double_t xTOF0 = 370.0;
391
392 Double_t c2 = track->GetSnp() + track->GetC() * (xtof - track->GetX());
393 if (TMath::Abs(c2) >= 0.99) {
394 delete track;
395 continue;
396 }
397
398 PropagateToX(*track,xTOF0,fgkMaxStep);
399
400 // Energy losses taken to the account - check one more time
401 c2 = track->GetSnp() + track->GetC() * (xtof - track->GetX());
402 if (TMath::Abs(c2) >= 0.99) {
403 delete track;
404 continue;
405 }
406
407 //if (!PropagateToX(*track,xTOF0,fgkMaxStep)) {
408 // fHBackfit->Fill(7);
409 //delete track;
410 // continue;
411 //}
412
413 Double_t ymax = xtof * TMath::Tan(0.5 * AliTRDgeometry::GetAlpha());
414 Double_t y;
415 track->GetYAt(xtof,GetBz(),y);
416 if (y > ymax) {
417 if (!track->Rotate( AliTRDgeometry::GetAlpha())) {
418 delete track;
419 continue;
420 }
421 }else if (y < -ymax) {
422 if (!track->Rotate(-AliTRDgeometry::GetAlpha())) {
423 delete track;
424 continue;
425 }
426 }
427
428 if (track->PropagateTo(xtof)) {
429 //AliInfo("set kTRDout");
430 seed->UpdateTrackParams(track,AliESDtrack::kTRDout);
431
432 for (Int_t i = 0; i < AliESDtrack::kNPlane; i++) {
433 for (Int_t j = 0; j < AliESDtrack::kNSlice; j++) {
434 seed->SetTRDsignals(track->GetPIDsignals(i,j),i,j);
435 }
436 seed->SetTRDTimBin(track->GetPIDTimBin(i),i);
437 }
438 //seed->SetTRDtrack(new AliTRDtrack(*track));
439 if (track->GetNumberOfClusters() > foundMin) found++;
440 }
441 } else {
442 //AliInfo("Track stopped in TRD ...");
443
444 if ((track->GetNumberOfClusters() > 15) &&
445 (track->GetNumberOfClusters() > 0.5*expectedClr)) {
446 seed->UpdateTrackParams(track,AliESDtrack::kTRDout);
447
448 //seed->SetStatus(AliESDtrack::kTRDStop);
449 for (Int_t i = 0; i < AliESDtrack::kNPlane; i++) {
450 for (Int_t j = 0; j <AliESDtrack::kNSlice; j++) {
451 seed->SetTRDsignals(track->GetPIDsignals(i,j),i,j);
452 }
453 seed->SetTRDTimBin(track->GetPIDTimBin(i),i);
454 }
455 //seed->SetTRDtrack(new AliTRDtrack(*track));
456 found++;
457 }
458 }
459
460 //if (((t->GetStatus()&AliESDtrack::kTRDout)!=0 )
461
462 seed->SetTRDQuality(track->StatusForTOF());
463 seed->SetTRDBudget(track->GetBudget(0));
0906e73e 464 delete track;
0906e73e 465 }
466
467
eb38ed55 468 AliInfo(Form("Number of seeds: %d", nSeed));
469 AliInfo(Form("Number of back propagated TRD tracks: %d", found));
470
0906e73e 471 delete [] index;
472 delete [] quality;
473
474 return 0;
475}
476
477
478//____________________________________________________________________
479Int_t AliTRDtrackerV1::RefitInward(AliESDEvent *event)
480{
481 //
482 // Refits tracks within the TRD. The ESD event is expected to contain seeds
483 // at the outer part of the TRD.
484 // The tracks are propagated to the innermost time bin
485 // of the TRD and the ESD event is updated
486 // Origin: Thomas KUHR (Thomas.Kuhr@cern.ch)
487 //
488
489 Int_t nseed = 0; // contor for loaded seeds
490 Int_t found = 0; // contor for updated TRD tracks
bcb6fb78 491
492 // Calibration monitor
493 AliTRDCalibraFillHisto *calibra = AliTRDCalibraFillHisto::Instance();
494 if (!calibra) AliInfo("Could not get Calibra instance\n");
495
496
0906e73e 497 AliTRDtrackV1 track;
498 for (Int_t itrack = 0; itrack < event->GetNumberOfTracks(); itrack++) {
499 AliESDtrack *seed = event->GetTrack(itrack);
500 new(&track) AliTRDtrackV1(*seed);
501
502 if (track.GetX() < 270.0) {
503 seed->UpdateTrackParams(&track, AliESDtrack::kTRDbackup);
504 //AliInfo(Form("Remove for X = %7.3f [270.]\n", track.GetX()));
505 continue;
506 }
507
508 ULong_t status = seed->GetStatus();
509 if((status & AliESDtrack::kTRDout) == 0) continue;
510 if((status & AliESDtrack::kTRDin) != 0) continue;
511 nseed++;
512
513 track.ResetCovariance(50.0);
514
515 // do the propagation and processing
bcb6fb78 516 Bool_t kUPDATE = kFALSE;
517 Double_t xTPC = 250.0;
518 if(FollowProlongation(track)){
519 // computes PID for track
520 track.CookPID();
521 // update calibration references using this track
522 if(calibra->GetHisto2d()) calibra->UpdateHistogramsV1(&track);
523
524 // Prolongate to TPC
525 if (PropagateToX(track, xTPC, fgkMaxStep)) { // -with update
526 seed->UpdateTrackParams(&track, AliESDtrack::kTRDrefit);
527 track.UpdateESDtrack(seed);
528 // Add TRD track to ESDfriendTrack
529 if (AliTRDReconstructor::StreamLevel() > 0 /*&& quality TODO*/){
530 AliTRDtrackV1 *calibTrack = new AliTRDtrackV1(track);
531 calibTrack->SetOwner();
532 seed->AddCalibObject(calibTrack);
533 }
534 found++;
535 kUPDATE = kTRUE;
0906e73e 536 }
bcb6fb78 537 }
538
539 // Prolongate to TPC without update
540 if(!kUPDATE) {
0906e73e 541 AliTRDtrackV1 tt(*seed);
542 if (PropagateToX(tt, xTPC, fgkMaxStep)) seed->UpdateTrackParams(&tt, AliESDtrack::kTRDrefit);
543 }
544 }
545 AliInfo(Form("Number of loaded seeds: %d",nseed));
546 AliInfo(Form("Number of found tracks from loaded seeds: %d",found));
547
548 return 0;
549}
550
551
552//____________________________________________________________________
553Int_t AliTRDtrackerV1::FollowProlongation(AliTRDtrackV1 &t)
554{
555// Extrapolates the TRD track in the TPC direction.
556//
557// Parameters
558// t : the TRD track which has to be extrapolated
559//
560// Output
561// number of clusters attached to the track
562//
563// Detailed description
564//
565// Starting from current radial position of track <t> this function
566// extrapolates the track through the 6 TRD layers. The following steps
567// are being performed for each plane:
568// 1. prepare track:
569// a. get plane limits in the local x direction
570// b. check crossing sectors
571// c. check track inclination
572// 2. search tracklet in the tracker list (see GetTracklet() for details)
573// 3. evaluate material budget using the geo manager
574// 4. propagate and update track using the tracklet information.
575//
576// Debug level 2
577//
578
579 //AliInfo("");
580 Int_t nClustersExpected = 0;
581 Int_t lastplane = 5; //GetLastPlane(&t);
582 for (Int_t iplane = lastplane; iplane >= 0; iplane--) {
eb38ed55 583 Int_t index = 0;
584 AliTRDseedV1 *tracklet = GetTracklet(&t, iplane, index);
585 if(!tracklet) continue;
586 if(!tracklet->IsOK()) AliWarning("tracklet not OK");
587
588 t.SetTracklet(tracklet, iplane, index);
589
590 Double_t x = tracklet->GetX0();
591 if (x < (t.GetX()-fgkMaxStep) && !PropagateToX(t, x+fgkMaxStep, fgkMaxStep)) break;
0906e73e 592 if (!AdjustSector(&t)) break;
593
0906e73e 594 // Start global position
595 Double_t xyz0[3];
596 t.GetXYZ(xyz0);
597
598 // End global position
eb38ed55 599 Double_t alpha = t.GetAlpha(), y, z;
0906e73e 600 if (!t.GetProlongation(x,y,z)) break;
601 Double_t xyz1[3];
eb38ed55 602 xyz1[0] = x * TMath::Cos(alpha) - y * TMath::Sin(alpha);
603 xyz1[1] = x * TMath::Sin(alpha) + y * TMath::Cos(alpha);
0906e73e 604 xyz1[2] = z;
eb38ed55 605
0906e73e 606 // Get material budget
607 Double_t param[7];
eb38ed55 608 AliTracker::MeanMaterialBudget(xyz0, xyz1, param);
0906e73e 609 Double_t xrho= param[0]*param[4];
610 Double_t xx0 = param[1]; // Get mean propagation parameters
611
eb38ed55 612 // Propagate and update
613 t.PropagateTo(x, xx0, xrho);
0906e73e 614 if (!AdjustSector(&t)) break;
615
616 Double_t maxChi2 = t.GetPredictedChi2(tracklet);
617 if (maxChi2 < 1e+10 && t.Update(tracklet, maxChi2)){
618 nClustersExpected += tracklet->GetN();
619 }
620 }
621
0906e73e 622 if(AliTRDReconstructor::StreamLevel() > 1){
623 Int_t index;
624 for(int iplane=0; iplane<6; iplane++){
625 AliTRDseedV1 *tracklet = GetTracklet(&t, iplane, index);
626 if(!tracklet) continue;
627 t.SetTracklet(tracklet, iplane, index);
628 }
629
eb38ed55 630 TTreeSRedirector &cstreamer = *fgDebugStreamer;
0906e73e 631 cstreamer << "FollowProlongation"
632 << "ncl=" << nClustersExpected
633 << "track.=" << &t
634 << "\n";
635 }
0906e73e 636
637 return nClustersExpected;
638
639}
640
641//_____________________________________________________________________________
642Int_t AliTRDtrackerV1::FollowBackProlongation(AliTRDtrackV1 &t)
643{
644// Extrapolates the TRD track in the TOF direction.
645//
646// Parameters
647// t : the TRD track which has to be extrapolated
648//
649// Output
650// number of clusters attached to the track
651//
652// Detailed description
653//
654// Starting from current radial position of track <t> this function
655// extrapolates the track through the 6 TRD layers. The following steps
656// are being performed for each plane:
657// 1. prepare track:
658// a. get plane limits in the local x direction
659// b. check crossing sectors
660// c. check track inclination
661// 2. build tracklet (see AliTRDseed::AttachClusters() for details)
662// 3. evaluate material budget using the geo manager
663// 4. propagate and update track using the tracklet information.
664//
665// Debug level 2
666//
667
668 Int_t nClustersExpected = 0;
eb38ed55 669 Double_t clength = AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick();
670 AliTRDtrackingChamber *chamber = 0x0;
671
0906e73e 672 // Loop through the TRD planes
673 for (Int_t iplane = 0; iplane < AliTRDgeometry::Nplan(); iplane++) {
eb38ed55 674 // BUILD TRACKLET IF NOT ALREADY BUILT
675 Double_t x = 0., y, z, alpha;
676 AliTRDseedV1 tracklet(*t.GetTracklet(iplane));
677 if(!tracklet.IsOK()){
678 alpha = t.GetAlpha();
679 Int_t sector = Int_t(alpha/AliTRDgeometry::GetAlpha() + (alpha>0. ? 0 : AliTRDgeometry::kNsect));
0906e73e 680
eb38ed55 681 if(!fTrSec[sector].GetNChambers()) continue;
682
683 if((x = fTrSec[sector].GetX(iplane)) < 1.) continue;
684
685 if (!t.GetProlongation(x, y, z)) break;
686 Int_t stack = fGeom->GetChamber(z, iplane);
687 Int_t nCandidates = stack >= 0 ? 1 : 2;
688 z -= stack >= 0 ? 0. : 4.;
689
690 for(int icham=0; icham<nCandidates; icham++, z+=8){
691 if((stack = fGeom->GetChamber(z, iplane)) < 0) continue;
692
693 if(!(chamber = fTrSec[sector].GetChamber(stack, iplane))) continue;
694
2985ffcb 695 if(chamber->GetNClusters() < fgNTimeBins*AliTRDReconstructor::RecoParam()->GetFindableClusters()) continue;
eb38ed55 696
697 x = chamber->GetX();
698
699 AliTRDpadPlane *pp = fGeom->GetPadPlane(iplane, stack);
700 tracklet.SetTilt(TMath::Tan(-TMath::DegToRad()*pp->GetTiltingAngle()));
701 tracklet.SetPadLength(pp->GetLengthIPad());
702 tracklet.SetPlane(iplane);
703 tracklet.SetX0(x);
704 tracklet.Init(&t);
705 if(!tracklet.AttachClustersIter(chamber, 1000.)) continue;
706 tracklet.Init(&t);
707
2985ffcb 708 if(tracklet.GetN() < fgNTimeBins * AliTRDReconstructor::RecoParam()->GetFindableClusters()) continue;
eb38ed55 709
710 break;
711 }
712 }
713 if(!tracklet.IsOK()){
714 if(x < 1.) continue; //temporary
715 if(!PropagateToX(t, x-fgkMaxStep, fgkMaxStep)) break;
716 if(!AdjustSector(&t)) break;
717 if(TMath::Abs(t.GetSnp()) > fgkMaxSnp) break;
718 continue;
719 }
0906e73e 720
721 // Propagate closer to the current chamber if neccessary
eb38ed55 722 x -= clength;
723 if (x > (fgkMaxStep + t.GetX()) && !PropagateToX(t, x-fgkMaxStep, fgkMaxStep)) break;
0906e73e 724 if (!AdjustSector(&t)) break;
0906e73e 725 if (TMath::Abs(t.GetSnp()) > fgkMaxSnp) break;
0906e73e 726
727 // load tracklet to the tracker and the track
728 Int_t index = SetTracklet(&tracklet);
729 t.SetTracklet(&tracklet, iplane, index);
eb38ed55 730
731
0906e73e 732 // Calculate the mean material budget along the path inside the chamber
eb38ed55 733 //Calculate global entry and exit positions of the track in chamber (only track prolongation)
734 Double_t xyz0[3]; // entry point
735 t.GetXYZ(xyz0);
736 alpha = t.GetAlpha();
737 x = tracklet.GetX0();
738 if (!t.GetProlongation(x, y, z)) break;
739 Double_t xyz1[3]; // exit point
740 xyz1[0] = x * TMath::Cos(alpha) - y * TMath::Sin(alpha);
741 xyz1[1] = +x * TMath::Sin(alpha) + y * TMath::Cos(alpha);
742 xyz1[2] = z;
0906e73e 743 Double_t param[7];
744 AliTracker::MeanMaterialBudget(xyz0, xyz1, param);
745 // The mean propagation parameters
746 Double_t xrho = param[0]*param[4]; // density*length
747 Double_t xx0 = param[1]; // radiation length
748
749 // Propagate and update track
eb38ed55 750 t.PropagateTo(x, xx0, xrho);
0906e73e 751 if (!AdjustSector(&t)) break;
752 Double_t maxChi2 = t.GetPredictedChi2(&tracklet);
753 if (maxChi2<1e+10 && t.Update(&tracklet, maxChi2)){
eb38ed55 754 nClustersExpected += tracklet.GetN();
0906e73e 755 }
756 // Reset material budget if 2 consecutive gold
eb38ed55 757 if(iplane>0 && tracklet.GetN() + t.GetTracklet(iplane-1)->GetN() > 20) t.SetBudget(2, 0.);
0906e73e 758
759 // Make backup of the track until is gold
760 // TO DO update quality check of the track.
761 // consider comparison with fTimeBinsRange
2985ffcb 762 Float_t ratio0 = tracklet.GetN() / Float_t(fgNTimeBins);
0906e73e 763 //Float_t ratio1 = Float_t(t.GetNumberOfClusters()+1) / Float_t(t.GetNExpected()+1);
764 //printf("tracklet.GetChi2() %f [< 18.0]\n", tracklet.GetChi2());
765 //printf("ratio0 %f [> 0.8]\n", ratio0);
766 //printf("ratio1 %f [> 0.6]\n", ratio1);
767 //printf("ratio0+ratio1 %f [> 1.5]\n", ratio0+ratio1);
768 //printf("t.GetNCross() %d [== 0]\n", t.GetNCross());
769 //printf("TMath::Abs(t.GetSnp()) %f [< 0.85]\n", TMath::Abs(t.GetSnp()));
770 //printf("t.GetNumberOfClusters() %d [> 20]\n", t.GetNumberOfClusters());
771
772 if (//(tracklet.GetChi2() < 18.0) && TO DO check with FindClusters and move it to AliTRDseed::Update
773 (ratio0 > 0.8) &&
774 //(ratio1 > 0.6) &&
775 //(ratio0+ratio1 > 1.5) &&
776 (t.GetNCross() == 0) &&
777 (TMath::Abs(t.GetSnp()) < 0.85) &&
778 (t.GetNumberOfClusters() > 20)) t.MakeBackupTrack();
779
780 } // end planes loop
781
0906e73e 782 if(AliTRDReconstructor::StreamLevel() > 1){
eb38ed55 783 TTreeSRedirector &cstreamer = *fgDebugStreamer;
0906e73e 784 cstreamer << "FollowBackProlongation"
785 << "ncl=" << nClustersExpected
786 << "track.=" << &t
787 << "\n";
788 }
0906e73e 789
790 return nClustersExpected;
791}
792
eb38ed55 793//_________________________________________________________________________
794Float_t AliTRDtrackerV1::FitRieman(AliTRDseedV1 *tracklets, Double_t *chi2, Int_t *planes){
795//
796// Fits a Riemann-circle to the given points without tilting pad correction.
797// The fit is performed using an instance of the class AliRieman (equations
798// and transformations see documentation of this class)
799// Afterwards all the tracklets are Updated
800//
801// Parameters: - Array of tracklets (AliTRDseedV1)
802// - Storage for the chi2 values (beginning with direction z)
803// - Seeding configuration
804// Output: - The curvature
805//
806 AliRieman *fitter = AliTRDtrackerV1::GetRiemanFitter();
807 fitter->Reset();
808 Int_t allplanes[] = {0, 1, 2, 3, 4, 5};
809 Int_t *ppl = &allplanes[0];
810 Int_t maxLayers = 6;
811 if(planes){
812 maxLayers = 4;
813 ppl = planes;
814 }
815 for(Int_t il = 0; il < maxLayers; il++){
816 if(!tracklets[ppl[il]].IsOK()) continue;
817 fitter->AddPoint(tracklets[ppl[il]].GetX0(), tracklets[ppl[il]].GetYfitR(0), tracklets[ppl[il]].GetZProb(),1,10);
818 }
819 fitter->Update();
820 // Set the reference position of the fit and calculate the chi2 values
821 memset(chi2, 0, sizeof(Double_t) * 2);
822 for(Int_t il = 0; il < maxLayers; il++){
823 // Reference positions
824 tracklets[ppl[il]].Init(fitter);
825
826 // chi2
827 if((!tracklets[ppl[il]].IsOK()) && (!planes)) continue;
828 chi2[0] += tracklets[ppl[il]].GetChi2Z();
829 chi2[1] += tracklets[ppl[il]].GetChi2Y();
830 }
831 return fitter->GetC();
832}
833
834//_________________________________________________________________________
835void AliTRDtrackerV1::FitRieman(AliTRDcluster **seedcl, Double_t chi2[2])
836{
837//
838// Performs a Riemann helix fit using the seedclusters as spacepoints
839// Afterwards the chi2 values are calculated and the seeds are updated
840//
841// Parameters: - The four seedclusters
842// - The tracklet array (AliTRDseedV1)
843// - The seeding configuration
844// - Chi2 array
845//
846// debug level 2
847//
848 AliRieman *fitter = AliTRDtrackerV1::GetRiemanFitter();
849 fitter->Reset();
850 for(Int_t i = 0; i < 4; i++)
851 fitter->AddPoint(seedcl[i]->GetX(), seedcl[i]->GetY(), seedcl[i]->GetZ(), 1, 10);
852 fitter->Update();
853
854
855 // Update the seed and calculated the chi2 value
856 chi2[0] = 0; chi2[1] = 0;
857 for(Int_t ipl = 0; ipl < kNSeedPlanes; ipl++){
858 // chi2
859 chi2[0] += (seedcl[ipl]->GetZ() - fitter->GetZat(seedcl[ipl]->GetX())) * (seedcl[ipl]->GetZ() - fitter->GetZat(seedcl[ipl]->GetX()));
860 chi2[1] += (seedcl[ipl]->GetY() - fitter->GetYat(seedcl[ipl]->GetX())) * (seedcl[ipl]->GetY() - fitter->GetYat(seedcl[ipl]->GetX()));
861 }
862}
863
864
865//_________________________________________________________________________
866Float_t AliTRDtrackerV1::FitTiltedRiemanConstraint(AliTRDseedV1 *tracklets, Double_t zVertex)
867{
868//
869// Fits a helix to the clusters. Pad tilting is considered. As constraint it is
870// assumed that the vertex position is set to 0.
871// This method is very usefull for high-pt particles
872// Basis for the fit: (x - x0)^2 + (y - y0)^2 - R^2 = 0
873// x0, y0: Center of the circle
874// Measured y-position: ymeas = y - tan(phiT)(zc - zt)
875// zc: center of the pad row
876// Equation which has to be fitted (after transformation):
877// a + b * u + e * v + 2*(ymeas + tan(phiT)(z - zVertex))*t = 0
878// Transformation:
879// t = 1/(x^2 + y^2)
880// u = 2 * x * t
881// v = 2 * x * tan(phiT) * t
882// Parameters in the equation:
883// a = -1/y0, b = x0/y0, e = dz/dx
884//
885// The Curvature is calculated by the following equation:
886// - curv = a/Sqrt(b^2 + 1) = 1/R
887// Parameters: - the 6 tracklets
888// - the Vertex constraint
889// Output: - the Chi2 value of the track
890//
891// debug level 5
892//
893
eb38ed55 894 TLinearFitter *fitter = GetTiltedRiemanFitterConstraint();
895 fitter->StoreData(kTRUE);
896 fitter->ClearPoints();
897
898 Float_t x, y, z, w, t, error, tilt;
899 Double_t uvt[2];
900 Int_t nPoints = 0;
901 for(Int_t ipl = 0; ipl < AliTRDgeometry::kNplan; ipl++){
902 if(!tracklets[ipl].IsOK()) continue;
2985ffcb 903 for(Int_t itb = 0; itb < fgNTimeBins; itb++){
eb38ed55 904 if(!tracklets[ipl].IsUsable(itb)) continue;
905 x = tracklets[ipl].GetX(itb) + tracklets[ipl].GetX0();
906 y = tracklets[ipl].GetY(itb);
907 z = tracklets[ipl].GetZ(itb);
908 tilt = tracklets[ipl].GetTilt();
909 // Transformation
910 t = 1/(x * x + y * y);
911 uvt[0] = 2 * x* t;
912 uvt[1] = 2.0 * tilt * x * t;
913 w = 2.0 * (y + tilt * (z - zVertex)) * t;
914 error = 2 * 0.2 * t;
915 fitter->AddPoint(uvt, w, error);
916 nPoints++;
917 }
918 }
919 fitter->Eval();
920
921 // Calculate curvature
922 Double_t a = fitter->GetParameter(0);
923 Double_t b = fitter->GetParameter(0);
924 Double_t curvature = a/TMath::Sqrt(b*b + 1);
925
926 Float_t chi2track = fitter->GetChisquare()/Double_t(nPoints);
927 for(Int_t ip = 0; ip < AliTRDtrackerV1::kNPlanes; ip++)
928 tracklets[ip].SetCC(curvature);
929
930 if(AliTRDReconstructor::StreamLevel() >= 5){
931 //Linear Model on z-direction
932 Double_t xref = (tracklets[2].GetX0() + tracklets[3].GetX0())/2; // Relative to the middle of the stack
933 Double_t slope = fitter->GetParameter(2);
934 Double_t zref = slope * xref;
935 Float_t chi2Z = CalculateChi2Z(tracklets, zref, slope);
936 TTreeSRedirector &treeStreamer = *fgDebugStreamer;
937 treeStreamer << "FitTiltedRiemanConstraint"
938 << "Curvature=" << curvature
939 << "Chi2Track=" << chi2track
940 << "Chi2Z=" << chi2Z
941 << "zref=" << zref
942 << "\n";
943 }
944 return chi2track;
945}
946
947//_________________________________________________________________________
948Float_t AliTRDtrackerV1::FitTiltedRieman(AliTRDseedV1 *tracklets, Bool_t sigError)
949{
950//
951// Performs a Riemann fit taking tilting pad correction into account
952// The equation of a Riemann circle, where the y position is substituted by the
953// measured y-position taking pad tilting into account, has to be transformed
954// into a 4-dimensional hyperplane equation
955// Riemann circle: (x-x0)^2 + (y-y0)^2 -R^2 = 0
956// Measured y-Position: ymeas = y - tan(phiT)(zc - zt)
957// zc: center of the pad row
958// zt: z-position of the track
959// The z-position of the track is assumed to be linear dependent on the x-position
960// Transformed equation: a + b * u + c * t + d * v + e * w - 2 * (ymeas + tan(phiT) * zc) * t = 0
961// Transformation: u = 2 * x * t
962// v = 2 * tan(phiT) * t
963// w = 2 * tan(phiT) * (x - xref) * t
964// t = 1 / (x^2 + ymeas^2)
965// Parameters: a = -1/y0
966// b = x0/y0
967// c = (R^2 -x0^2 - y0^2)/y0
968// d = offset
969// e = dz/dx
970// If the offset respectively the slope in z-position is impossible, the parameters are fixed using
971// results from the simple riemann fit. Afterwards the fit is redone.
972// The curvature is calculated according to the formula:
973// curv = a/(1 + b^2 + c*a) = 1/R
974//
975// Paramters: - Array of tracklets (connected to the track candidate)
976// - Flag selecting the error definition
977// Output: - Chi2 value of the track
978//
979// debug level 5
980//
eb38ed55 981 TLinearFitter *fitter = GetTiltedRiemanFitter();
982 fitter->StoreData(kTRUE);
983 fitter->ClearPoints();
984
985 // Calculate the reference position:
986 Int_t nDistances = 0;
987 Float_t meanDistance = 0.;
988 Int_t startIndex = 5;
989 for(Int_t il =5; il > 0; il--){
990 if(tracklets[il].IsOK() && tracklets[il -1].IsOK()){
991 meanDistance += tracklets[il].GetX0() - tracklets[il -1].GetX0();
992 nDistances++;
993 }
994 if(tracklets[il].IsOK()) startIndex = il;
995 }
996 meanDistance /= nDistances;
997 if(tracklets[0].IsOK()) startIndex = 0;
998 Double_t xref = tracklets[startIndex].GetX0() + (2.5 - startIndex) * meanDistance - 0.5 * (AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick());
999
1000 Float_t x, y, z, t, tilt, xdelta, rhs, error;
1001 Float_t dzMean = 0; Int_t dzcounter = 0; // A reference z and a reference slope is used if the fitresults in z-direction are not acceptable
1002 Double_t uvt[4];
1003 Int_t nPoints = 0;
1004 for(Int_t ipl = 0; ipl < AliTRDgeometry::kNplan; ipl++){
1005 if(!tracklets[ipl].IsOK()) continue;
1006 dzMean += tracklets[ipl].GetZfitR(1);
1007 dzcounter++;
2985ffcb 1008 for(Int_t itb = 0; itb < fgNTimeBins; itb++){
eb38ed55 1009 if (!tracklets[ipl].IsUsable(itb)) continue;
1010 x = tracklets[ipl].GetX(itb) + tracklets[ipl].GetX0();
1011 y = tracklets[ipl].GetY(itb);
1012 z = tracklets[ipl].GetZ(itb);
1013 tilt = tracklets[ipl].GetTilt();
1014 xdelta = x - xref;
1015 // Transformation
1016 t = 1/(x*x + y*y);
1017 uvt[0] = 2.0 * x * t;
1018 uvt[1] = t;
1019 uvt[2] = 2.0 * tilt * t;
1020 uvt[3] = 2.0 * tilt * xdelta * t;
1021 rhs = 2.0 * (y + tilt*z) * t;
1022 // error definition changes for the different calls
1023 error = 2.0 * t;
1024 error *= sigError ? tracklets[ipl].GetSigmaY() : 0.2;
1025 fitter->AddPoint(uvt, rhs, error);
1026 nPoints++;
1027 }
1028 }
1029
1030 fitter->Eval();
1031
1032 Double_t offset = fitter->GetParameter(3);
1033 Double_t slope = fitter->GetParameter(4);
1034
1035 // Linear fitter - not possible to make boundaries
1036 // Do not accept non possible z and dzdx combinations
1037 Bool_t acceptablez = kTRUE;
1038 Double_t zref = 0.0;
1039 for (Int_t iLayer = 0; iLayer < AliTRDgeometry::kNplan; iLayer++) {
1040 if(!tracklets[iLayer].IsOK()) continue;
1041 zref = offset + slope * (tracklets[iLayer].GetX0() - xref);
1042 if (TMath::Abs(tracklets[iLayer].GetZProb() - zref) > tracklets[iLayer].GetPadLength() * 0.5 + 1.0)
1043 acceptablez = kFALSE;
1044 }
1045 if (!acceptablez) {
1046 dzMean /= dzcounter;
1047 Double_t zmf = tracklets[startIndex].GetZfitR(0) + dzMean * (xref - tracklets[startIndex].GetX0()); // Z-Position of the track at the middle of a stack assuming a linear dependence on x (approximation)
1048 fgTiltedRieman->FixParameter(3, zmf);
1049 fgTiltedRieman->FixParameter(4, dzMean);
1050 fitter->Eval();
1051 fitter->ReleaseParameter(3);
1052 fitter->ReleaseParameter(4);
1053 offset = fitter->GetParameter(3);
1054 slope = fitter->GetParameter(4);
1055 }
1056
1057 // Calculate Curvarture
1058 Double_t a = fitter->GetParameter(0);
1059 Double_t b = fitter->GetParameter(1);
1060 Double_t c = fitter->GetParameter(2);
1061 Double_t curvature = 1.0 + b*b - c*a;
1062 Double_t dca = 0.0; // Distance to closest approach
1063 if (curvature > 0.0) {
1064 dca = -c / (TMath::Sqrt(1.0 + b*b - c*a) + TMath::Sqrt(1.0 + b*b));
1065 curvature = a / TMath::Sqrt(curvature);
1066 }
1067
1068 Double_t chi2track = fitter->GetChisquare()/Double_t(nPoints);
1069
1070 // Update the tracklets
1071 Double_t dy, dz;
1072 for(Int_t iLayer = 0; iLayer < AliTRDtrackerV1::kNPlanes; iLayer++) {
1073
1074 x = tracklets[iLayer].GetX0();
1075 y = 0;
1076 z = 0;
1077 dy = 0;
1078 dz = 0;
1079
1080 // y: R^2 = (x - x0)^2 + (y - y0)^2
1081 // => y = y0 +/- Sqrt(R^2 - (x - x0)^2)
1082 // R = Sqrt() = 1/Curvature
1083 // => y = y0 +/- Sqrt(1/Curvature^2 - (x - x0)^2)
1084 Double_t res = (x * a + b); // = (x - x0)/y0
1085 res *= res;
1086 res = 1.0 - c * a + b * b - res; // = (R^2 - (x - x0)^2)/y0^2
1087 if (res >= 0) {
1088 res = TMath::Sqrt(res);
1089 y = (1.0 - res) / a;
1090 }
1091
1092 // dy: R^2 = (x - x0)^2 + (y - y0)^2
1093 // => y = +/- Sqrt(R^2 - (x - x0)^2) + y0
1094 // => dy/dx = (x - x0)/Sqrt(R^2 - (x - x0)^2)
1095 // Curvature: cr = 1/R = a/Sqrt(1 + b^2 - c*a)
1096 // => dy/dx = (x - x0)/(1/(cr^2) - (x - x0)^2)
1097 Double_t x0 = -b / a;
1098 if (-c * a + b * b + 1 > 0) {
1099 if (1.0/(curvature * curvature) - (x - x0) * (x - x0) > 0.0) {
1100 Double_t yderiv = (x - x0) / TMath::Sqrt(1.0/(curvature * curvature) - (x - x0) * (x - x0));
1101 if (a < 0) yderiv *= -1.0;
1102 dy = yderiv;
1103 }
1104 }
1105 z = offset + slope * (x - xref);
1106 dz = slope;
1107 tracklets[iLayer].SetYref(0, y);
1108 tracklets[iLayer].SetYref(1, dy);
1109 tracklets[iLayer].SetZref(0, z);
1110 tracklets[iLayer].SetZref(1, dz);
1111 tracklets[iLayer].SetC(curvature);
1112 tracklets[iLayer].SetChi2(chi2track);
1113 }
1114
1115
1116 if(AliTRDReconstructor::StreamLevel() >= 5){
1117 Double_t chi2Z = CalculateChi2Z(tracklets, offset, slope);
1118 TTreeSRedirector &treeStreamer = *fgDebugStreamer;
1119 treeStreamer << "FitTiltedRieman"
1120 << "error=" << sigError
1121 << "Curvature=" << curvature
1122 << "Chi2track=" << chi2track
1123 << "Chi2Z=" << chi2Z
1124 << "D=" << c
1125 << "DCA=" << dca
1126 << "Offset=" << offset
1127 << "Slope=" << slope
1128 << "\n";
1129 }
1130
1131 return chi2track;
1132}
1133
1134//_________________________________________________________________________
1135Float_t AliTRDtrackerV1::CalculateChi2Z(AliTRDseedV1 *tracklets, Double_t offset, Double_t slope)
1136{
1137//
1138// Calculates the chi2-value of the track in z-Direction including tilting pad correction.
1139// A linear dependence on the x-value serves as a model.
1140// The parameters are related to the tilted Riemann fit.
1141// Parameters: - Array of tracklets (AliTRDseedV1) related to the track candidate
1142// - the offset for the reference x
1143// - the slope
1144// Output: - The Chi2 value of the track in z-Direction
1145//
1146 Double_t xref = .5 * (tracklets[2].GetX0() + tracklets[3].GetX0());
1147 Float_t chi2Z = 0, nLayers = 0;
1148 for (Int_t iLayer = 0; iLayer < AliTRDgeometry::kNplan; iLayer++) {
1149 if(!tracklets[iLayer].IsOK()) continue;
1150 Double_t z = offset + slope * (tracklets[iLayer].GetX0() - xref);
1151 chi2Z += TMath::Abs(tracklets[iLayer].GetMeanz() - z);
1152 nLayers++;
1153 }
1154 chi2Z /= TMath::Max((nLayers - 3.0),1.0);
1155 return chi2Z;
1156}
1157
1158
1159
bccda319 1160//_____________________________________________________________________________
1161Int_t AliTRDtrackerV1::PropagateToX(AliTRDtrackV1 &t, Double_t xToGo, Double_t maxStep)
1162{
1163 //
1164 // Starting from current X-position of track <t> this function
1165 // extrapolates the track up to radial position <xToGo>.
1166 // Returns 1 if track reaches the plane, and 0 otherwise
1167 //
1168
1169 const Double_t kEpsilon = 0.00001;
1170
1171 // Current track X-position
1172 Double_t xpos = t.GetX();
1173
1174 // Direction: inward or outward
1175 Double_t dir = (xpos < xToGo) ? 1.0 : -1.0;
1176
1177 while (((xToGo - xpos) * dir) > kEpsilon) {
1178
1179 Double_t xyz0[3];
1180 Double_t xyz1[3];
1181 Double_t param[7];
1182 Double_t x;
1183 Double_t y;
1184 Double_t z;
1185
1186 // The next step size
1187 Double_t step = dir * TMath::Min(TMath::Abs(xToGo-xpos),maxStep);
1188
1189 // Get the global position of the starting point
1190 t.GetXYZ(xyz0);
1191
1192 // X-position after next step
1193 x = xpos + step;
1194
1195 // Get local Y and Z at the X-position of the next step
1196 if (!t.GetProlongation(x,y,z)) {
1197 return 0; // No prolongation possible
1198 }
1199
1200 // The global position of the end point of this prolongation step
1201 xyz1[0] = x * TMath::Cos(t.GetAlpha()) - y * TMath::Sin(t.GetAlpha());
1202 xyz1[1] = +x * TMath::Sin(t.GetAlpha()) + y * TMath::Cos(t.GetAlpha());
1203 xyz1[2] = z;
1204
1205 // Calculate the mean material budget between start and
1206 // end point of this prolongation step
eb38ed55 1207 AliTracker::MeanMaterialBudget(xyz0, xyz1, param);
bccda319 1208
1209 // Propagate the track to the X-position after the next step
1210 if (!t.PropagateTo(x,param[1],param[0]*param[4])) {
1211 return 0;
1212 }
1213
1214 // Rotate the track if necessary
1215 AdjustSector(&t);
1216
1217 // New track X-position
1218 xpos = t.GetX();
1219
1220 }
1221
1222 return 1;
1223
1224}
1225
eb38ed55 1226
1227//_____________________________________________________________________________
1228Int_t AliTRDtrackerV1::ReadClusters(TClonesArray* &array, TTree *clusterTree) const
1229{
1230 //
1231 // Reads AliTRDclusters from the file.
1232 // The names of the cluster tree and branches
1233 // should match the ones used in AliTRDclusterizer::WriteClusters()
1234 //
1235
1236 Int_t nsize = Int_t(clusterTree->GetTotBytes() / (sizeof(AliTRDcluster)));
1237 TObjArray *clusterArray = new TObjArray(nsize+1000);
1238
1239 TBranch *branch = clusterTree->GetBranch("TRDcluster");
1240 if (!branch) {
1241 AliError("Can't get the branch !");
1242 return 1;
1243 }
1244 branch->SetAddress(&clusterArray);
1245
1246 if(!fClusters){
1247 array = new TClonesArray("AliTRDcluster", nsize);
1248 array->SetOwner(kTRUE);
1249 }
1250
1251 // Loop through all entries in the tree
1252 Int_t nEntries = (Int_t) clusterTree->GetEntries();
1253 Int_t nbytes = 0;
1254 Int_t ncl = 0;
1255 AliTRDcluster *c = 0x0;
1256 for (Int_t iEntry = 0; iEntry < nEntries; iEntry++) {
1257 // Import the tree
1258 nbytes += clusterTree->GetEvent(iEntry);
1259
1260 // Get the number of points in the detector
1261 Int_t nCluster = clusterArray->GetEntriesFast();
1262 for (Int_t iCluster = 0; iCluster < nCluster; iCluster++) {
1263 if(!(c = (AliTRDcluster *) clusterArray->UncheckedAt(iCluster))) continue;
1264 new((*fClusters)[ncl++]) AliTRDcluster(*c);
1265 clusterArray->RemoveAt(iCluster);
1266 }
1267
1268 }
1269 delete clusterArray;
1270
1271 return 0;
1272}
1273
1274//_____________________________________________________________________________
1275Int_t AliTRDtrackerV1::LoadClusters(TTree *cTree)
1276{
1277 //
1278 // Fills clusters into TRD tracking_sectors
1279 // Note that the numbering scheme for the TRD tracking_sectors
1280 // differs from that of TRD sectors
1281 //
1282
1283
1284 if (ReadClusters(fClusters, cTree)) {
1285 AliError("Problem with reading the clusters !");
1286 return 1;
1287 }
1288 Int_t ncl = fClusters->GetEntriesFast(), nin = 0;
75b9b3c1 1289 if(!ncl){
1290 AliInfo("Clusters 0");
1291 return 1;
1292 }
1293
eb38ed55 1294 Int_t icl = ncl;
1295 while (icl--) {
1296 AliTRDcluster *c = (AliTRDcluster *) fClusters->UncheckedAt(icl);
1297 if(c->IsInChamber()) nin++;
1298 Int_t detector = c->GetDetector();
1299 Int_t sector = fGeom->GetSector(detector);
1300 Int_t stack = fGeom->GetChamber(detector);
1301 Int_t plane = fGeom->GetPlane(detector);
1302
1303 fTrSec[sector].GetChamber(stack, plane, kTRUE)->InsertCluster(c, icl);
1304 }
1305 AliInfo(Form("Clusters %d in %6.2f %%", ncl, 100.*float(nin)/ncl));
1306
1307 for(int isector =0; isector<AliTRDgeometry::kNsect; isector++){
1308 if(!fTrSec[isector].GetNChambers()) continue;
1309 fTrSec[isector].Init();
1310 }
1311
1312 return 0;
1313}
1314
1315
0906e73e 1316//____________________________________________________________________
1317void AliTRDtrackerV1::UnloadClusters()
1318{
1319 //
1320 // Clears the arrays of clusters and tracks. Resets sectors and timebins
1321 //
1322
eb38ed55 1323 if(fTracks) fTracks->Delete();
1324 if(fTracklets) fTracklets->Delete();
1325 if(fClusters) fClusters->Delete();
0906e73e 1326
eb38ed55 1327 for (int i = 0; i < AliTRDgeometry::kNsect; i++) fTrSec[i].Clear();
0906e73e 1328
eb38ed55 1329}
0906e73e 1330
eb38ed55 1331//_____________________________________________________________________________
1332Bool_t AliTRDtrackerV1::AdjustSector(AliTRDtrackV1 *track)
1333{
1334 //
1335 // Rotates the track when necessary
1336 //
1337
1338 Double_t alpha = AliTRDgeometry::GetAlpha();
1339 Double_t y = track->GetY();
1340 Double_t ymax = track->GetX()*TMath::Tan(0.5*alpha);
0906e73e 1341
eb38ed55 1342 if (y > ymax) {
1343 if (!track->Rotate( alpha)) {
1344 return kFALSE;
0906e73e 1345 }
eb38ed55 1346 }
1347 else if (y < -ymax) {
1348 if (!track->Rotate(-alpha)) {
1349 return kFALSE;
1350 }
1351 }
1352
1353 return kTRUE;
0906e73e 1354
1355}
1356
eb38ed55 1357
0906e73e 1358//____________________________________________________________________
1359AliTRDseedV1* AliTRDtrackerV1::GetTracklet(AliTRDtrackV1 *track, Int_t p, Int_t &idx)
1360{
1361// Find tracklet for TRD track <track>
1362// Parameters
1363// - track
1364// - sector
1365// - plane
1366// - index
1367// Output
1368// tracklet
1369// index
1370// Detailed description
1371//
1372 idx = track->GetTrackletIndex(p);
0906e73e 1373 AliTRDseedV1 *tracklet = idx<0 ? 0x0 : (AliTRDseedV1*)fTracklets->UncheckedAt(idx);
0906e73e 1374
1375 return tracklet;
1376}
1377
1378//____________________________________________________________________
bc11c056 1379Int_t AliTRDtrackerV1::SetTracklet(AliTRDseedV1 *tracklet)
0906e73e 1380{
1381// Add this tracklet to the list of tracklets stored in the tracker
1382//
1383// Parameters
1384// - tracklet : pointer to the tracklet to be added to the list
1385//
1386// Output
1387// - the index of the new tracklet in the tracker tracklets list
1388//
1389// Detailed description
1390// Build the tracklets list if it is not yet created (late initialization)
1391// and adds the new tracklet to the list.
1392//
1393 if(!fTracklets){
1394 fTracklets = new TClonesArray("AliTRDseedV1", AliTRDgeometry::Nsect()*kMaxTracksStack);
1395 fTracklets->SetOwner(kTRUE);
1396 }
1397 Int_t nentries = fTracklets->GetEntriesFast();
58bc08c1 1398 new ((*fTracklets)[nentries]) AliTRDseedV1(*tracklet);
0906e73e 1399 return nentries;
1400}
1401
e4f2f73d 1402//____________________________________________________________________
eb38ed55 1403Int_t AliTRDtrackerV1::Clusters2TracksSM(Int_t sector, AliESDEvent *esd)
e4f2f73d 1404{
1405 //
1406 // Steer tracking for one SM.
1407 //
1408 // Parameters :
1409 // sector : Array of (SM) propagation layers containing clusters
1410 // esd : The current ESD event. On output it contains the also
1411 // the ESD (TRD) tracks found in this SM.
1412 //
1413 // Output :
1414 // Number of tracks found in this TRD supermodule.
1415 //
1416 // Detailed description
1417 //
1418 // 1. Unpack AliTRDpropagationLayers objects for each stack.
1419 // 2. Launch stack tracking.
1420 // See AliTRDtrackerV1::Clusters2TracksStack() for details.
1421 // 3. Pack results in the ESD event.
1422 //
1423
e4f2f73d 1424 // allocate space for esd tracks in this SM
1425 TClonesArray esdTrackList("AliESDtrack", 2*kMaxTracksStack);
1426 esdTrackList.SetOwner();
e4f2f73d 1427
eb38ed55 1428 Int_t nTracks = 0;
1429 Int_t nChambers = 0;
1430 AliTRDtrackingChamber **stack = 0x0, *chamber = 0x0;
1431 for(int istack = 0; istack<AliTRDgeometry::kNcham; istack++){
1432 if(!(stack = fTrSec[sector].GetStack(istack))) continue;
1433 nChambers = 0;
1434 for(int iplane=0; iplane<AliTRDgeometry::kNplan; iplane++){
1435 if(!(chamber = stack[iplane])) continue;
2985ffcb 1436 if(chamber->GetNClusters() < fgNTimeBins * AliTRDReconstructor::RecoParam()->GetFindableClusters()) continue;
eb38ed55 1437 nChambers++;
1438 //AliInfo(Form("sector %d stack %d plane %d clusters %d", sector, istack, iplane, chamber->GetNClusters()));
e4f2f73d 1439 }
eb38ed55 1440 if(nChambers < 4) continue;
1441 //AliInfo(Form("Doing stack %d", istack));
1442 nTracks += Clusters2TracksStack(stack, &esdTrackList);
e4f2f73d 1443 }
eb38ed55 1444 //AliInfo(Form("Found %d tracks in SM %d [%d]\n", nTracks, sector, esd->GetNumberOfTracks()));
e4f2f73d 1445
eb38ed55 1446 for(int itrack=0; itrack<nTracks; itrack++)
e4f2f73d 1447 esd->AddTrack((AliESDtrack*)esdTrackList[itrack]);
1448
eb38ed55 1449 return nTracks;
e4f2f73d 1450}
1451
1452//____________________________________________________________________
eb38ed55 1453Int_t AliTRDtrackerV1::Clusters2TracksStack(AliTRDtrackingChamber **stack, TClonesArray *esdTrackList)
e4f2f73d 1454{
1455 //
1456 // Make tracks in one TRD stack.
1457 //
1458 // Parameters :
1459 // layer : Array of stack propagation layers containing clusters
1460 // esdTrackList : Array of ESD tracks found by the stand alone tracker.
1461 // On exit the tracks found in this stack are appended.
1462 //
1463 // Output :
1464 // Number of tracks found in this stack.
1465 //
1466 // Detailed description
1467 //
1468 // 1. Find the 3 most useful seeding chambers. See BuildSeedingConfigs() for details.
1469 // 2. Steer AliTRDtrackerV1::MakeSeeds() for 3 seeding layer configurations.
1470 // See AliTRDtrackerV1::MakeSeeds() for more details.
1471 // 3. Arrange track candidates in decreasing order of their quality
1472 // 4. Classify tracks in 5 categories according to:
1473 // a) number of layers crossed
1474 // b) track quality
1475 // 5. Sign clusters by tracks in decreasing order of track quality
1476 // 6. Build AliTRDtrack out of seeding tracklets
1477 // 7. Cook MC label
1478 // 8. Build ESD track and register it to the output list
1479 //
1480
eb38ed55 1481 AliTRDtrackingChamber *chamber = 0x0;
e4f2f73d 1482 AliTRDseedV1 sseed[kMaxTracksStack*6]; // to be initialized
0906e73e 1483 Int_t pars[4]; // MakeSeeds parameters
e4f2f73d 1484
1485 //Double_t alpha = AliTRDgeometry::GetAlpha();
1486 //Double_t shift = .5 * alpha;
1487 Int_t configs[kNConfigs];
1488
1489 // Build initial seeding configurations
eb38ed55 1490 Double_t quality = BuildSeedingConfigs(stack, configs);
1491 if(AliTRDReconstructor::StreamLevel() > 1){
1492 AliInfo(Form("Plane config %d %d %d Quality %f"
1493 , configs[0], configs[1], configs[2], quality));
1494 }
1495
e4f2f73d 1496 // Initialize contors
1497 Int_t ntracks, // number of TRD track candidates
1498 ntracks1, // number of registered TRD tracks/iter
1499 ntracks2 = 0; // number of all registered TRD tracks in stack
1500 fSieveSeeding = 0;
1501 do{
1502 // Loop over seeding configurations
1503 ntracks = 0; ntracks1 = 0;
1504 for (Int_t iconf = 0; iconf<3; iconf++) {
1505 pars[0] = configs[iconf];
eb38ed55 1506 pars[1] = ntracks;
1507 ntracks = MakeSeeds(stack, &sseed[6*ntracks], pars);
e4f2f73d 1508 if(ntracks == kMaxTracksStack) break;
1509 }
eb38ed55 1510 if(AliTRDReconstructor::StreamLevel() > 1) AliInfo(Form("Candidate TRD tracks %d in iteration %d.", ntracks, fSieveSeeding));
1511
e4f2f73d 1512 if(!ntracks) break;
1513
1514 // Sort the seeds according to their quality
1515 Int_t sort[kMaxTracksStack];
1516 TMath::Sort(ntracks, fTrackQuality, sort, kTRUE);
1517
1518 // Initialize number of tracks so far and logic switches
1519 Int_t ntracks0 = esdTrackList->GetEntriesFast();
1520 Bool_t signedTrack[kMaxTracksStack];
1521 Bool_t fakeTrack[kMaxTracksStack];
1522 for (Int_t i=0; i<ntracks; i++){
1523 signedTrack[i] = kFALSE;
1524 fakeTrack[i] = kFALSE;
1525 }
1526 //AliInfo("Selecting track candidates ...");
1527
1528 // Sieve clusters in decreasing order of track quality
1529 Double_t trackParams[7];
1530// AliTRDseedV1 *lseed = 0x0;
1531 Int_t jSieve = 0, candidates;
1532 do{
1533 //AliInfo(Form("\t\tITER = %i ", jSieve));
1534
1535 // Check track candidates
1536 candidates = 0;
1537 for (Int_t itrack = 0; itrack < ntracks; itrack++) {
1538 Int_t trackIndex = sort[itrack];
1539 if (signedTrack[trackIndex] || fakeTrack[trackIndex]) continue;
1540
1541
1542 // Calculate track parameters from tracklets seeds
1543 Int_t labelsall[1000];
1544 Int_t nlabelsall = 0;
1545 Int_t naccepted = 0;
1546 Int_t ncl = 0;
1547 Int_t nused = 0;
1548 Int_t nlayers = 0;
1549 Int_t findable = 0;
1550 for (Int_t jLayer = 0; jLayer < kNPlanes; jLayer++) {
1551 Int_t jseed = kNPlanes*trackIndex+jLayer;
e4f2f73d 1552 if(!sseed[jseed].IsOK()) continue;
eb38ed55 1553 if (TMath::Abs(sseed[jseed].GetYref(0) / sseed[jseed].GetX0()) < 0.15) findable++;
1554
e4f2f73d 1555 sseed[jseed].UpdateUsed();
1556 ncl += sseed[jseed].GetN2();
1557 nused += sseed[jseed].GetNUsed();
1558 nlayers++;
1559
1560 // Cooking label
2985ffcb 1561 for (Int_t itime = 0; itime < fgNTimeBins; itime++) {
e4f2f73d 1562 if(!sseed[jseed].IsUsable(itime)) continue;
1563 naccepted++;
1564 Int_t tindex = 0, ilab = 0;
1565 while(ilab<3 && (tindex = sseed[jseed].GetClusters(itime)->GetLabel(ilab)) >= 0){
1566 labelsall[nlabelsall++] = tindex;
1567 ilab++;
1568 }
1569 }
1570 }
1571 // Filter duplicated tracks
1572 if (nused > 30){
eb38ed55 1573 //printf("Skip %d nused %d\n", trackIndex, nused);
e4f2f73d 1574 fakeTrack[trackIndex] = kTRUE;
1575 continue;
1576 }
1577 if (Float_t(nused)/ncl >= .25){
eb38ed55 1578 //printf("Skip %d nused/ncl >= .25\n", trackIndex);
e4f2f73d 1579 fakeTrack[trackIndex] = kTRUE;
1580 continue;
1581 }
1582
1583 // Classify tracks
1584 Bool_t skip = kFALSE;
1585 switch(jSieve){
1586 case 0:
1587 if(nlayers < 6) {skip = kTRUE; break;}
1588 if(TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -5.){skip = kTRUE; break;}
1589 break;
1590
1591 case 1:
1592 if(nlayers < findable){skip = kTRUE; break;}
1593 if(TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -4.){skip = kTRUE; break;}
1594 break;
1595
1596 case 2:
1597 if ((nlayers == findable) || (nlayers == 6)) { skip = kTRUE; break;}
1598 if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -6.0){skip = kTRUE; break;}
1599 break;
1600
1601 case 3:
1602 if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -5.){skip = kTRUE; break;}
1603 break;
1604
1605 case 4:
1606 if (nlayers == 3){skip = kTRUE; break;}
0906e73e 1607 //if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) - nused/(nlayers-3.0) < -15.0){skip = kTRUE; break;}
e4f2f73d 1608 break;
1609 }
1610 if(skip){
1611 candidates++;
eb38ed55 1612 //printf("REJECTED : %d [%d] nlayers %d trackQuality = %e nused %d\n", itrack, trackIndex, nlayers, fTrackQuality[trackIndex], nused);
e4f2f73d 1613 continue;
1614 }
1615 signedTrack[trackIndex] = kTRUE;
1616
1617
1618 // Build track label - what happens if measured data ???
1619 Int_t labels[1000];
1620 Int_t outlab[1000];
1621 Int_t nlab = 0;
1622 for (Int_t iLayer = 0; iLayer < 6; iLayer++) {
1623 Int_t jseed = kNPlanes*trackIndex+iLayer;
1624 if(!sseed[jseed].IsOK()) continue;
1625 for(int ilab=0; ilab<2; ilab++){
1626 if(sseed[jseed].GetLabels(ilab) < 0) continue;
1627 labels[nlab] = sseed[jseed].GetLabels(ilab);
1628 nlab++;
1629 }
1630 }
1631 Freq(nlab,labels,outlab,kFALSE);
1632 Int_t label = outlab[0];
1633 Int_t frequency = outlab[1];
1634 Freq(nlabelsall,labelsall,outlab,kFALSE);
1635 Int_t label1 = outlab[0];
1636 Int_t label2 = outlab[2];
1637 Float_t fakeratio = (naccepted - outlab[1]) / Float_t(naccepted);
1638
1639
1640 // Sign clusters
1641 AliTRDcluster *cl = 0x0; Int_t clusterIndex = -1;
1642 for (Int_t jLayer = 0; jLayer < 6; jLayer++) {
1643 Int_t jseed = kNPlanes*trackIndex+jLayer;
1644 if(!sseed[jseed].IsOK()) continue;
1645 if(TMath::Abs(sseed[jseed].GetYfit(1) - sseed[jseed].GetYfit(1)) >= .2) continue; // check this condition with Marian
1646 sseed[jseed].UseClusters();
1647 if(!cl){
1648 Int_t ic = 0;
1649 while(!(cl = sseed[jseed].GetClusters(ic))) ic++;
1650 clusterIndex = sseed[jseed].GetIndexes(ic);
1651 }
1652 }
1653 if(!cl) continue;
1654
1655
1656 // Build track parameters
1657 AliTRDseedV1 *lseed =&sseed[trackIndex*6];
1658 Int_t idx = 0;
1659 while(idx<3 && !lseed->IsOK()) {
1660 idx++;
1661 lseed++;
1662 }
1663 Double_t cR = lseed->GetC();
1664 trackParams[1] = lseed->GetYref(0);
1665 trackParams[2] = lseed->GetZref(0);
1666 trackParams[3] = lseed->GetX0() * cR - TMath::Sin(TMath::ATan(lseed->GetYref(1)));
1667 trackParams[4] = lseed->GetZref(1) / TMath::Sqrt(1. + lseed->GetYref(1) * lseed->GetYref(1));
1668 trackParams[5] = cR;
1669 trackParams[0] = lseed->GetX0();
eb38ed55 1670 Int_t ich = 0; while(!(chamber = stack[ich])) ich++;
1671 trackParams[6] = fGeom->GetSector(chamber->GetDetector());/* *alpha+shift; // Supermodule*/
e4f2f73d 1672
eb38ed55 1673 if(AliTRDReconstructor::StreamLevel() > 1){
1674 AliInfo(Form("Track %d [%d] nlayers %d trackQuality = %e nused %d, yref = %3.3f", itrack, trackIndex, nlayers, fTrackQuality[trackIndex], nused, trackParams[1]));
1675
e4f2f73d 1676 Int_t nclusters = 0;
1677 AliTRDseedV1 *dseed[6];
1678 for(int is=0; is<6; is++){
0906e73e 1679 dseed[is] = new AliTRDseedV1(sseed[trackIndex*6+is]);
1680 dseed[is]->SetOwner();
e4f2f73d 1681 nclusters += sseed[is].GetN2();
e4f2f73d 1682 }
1683 //Int_t eventNrInFile = esd->GetEventNumberInFile();
1684 //AliInfo(Form("Number of clusters %d.", nclusters));
eb38ed55 1685 TTreeSRedirector &cstreamer = *fgDebugStreamer;
e4f2f73d 1686 cstreamer << "Clusters2TracksStack"
1687 << "Iter=" << fSieveSeeding
1688 << "Like=" << fTrackQuality[trackIndex]
1689 << "S0.=" << dseed[0]
1690 << "S1.=" << dseed[1]
1691 << "S2.=" << dseed[2]
1692 << "S3.=" << dseed[3]
1693 << "S4.=" << dseed[4]
1694 << "S5.=" << dseed[5]
1695 << "p0=" << trackParams[0]
1696 << "p1=" << trackParams[1]
1697 << "p2=" << trackParams[2]
1698 << "p3=" << trackParams[3]
1699 << "p4=" << trackParams[4]
1700 << "p5=" << trackParams[5]
1701 << "p6=" << trackParams[6]
e4f2f73d 1702 << "Label=" << label
1703 << "Label1=" << label1
1704 << "Label2=" << label2
1705 << "FakeRatio=" << fakeratio
1706 << "Freq=" << frequency
1707 << "Ncl=" << ncl
1708 << "NLayers=" << nlayers
1709 << "Findable=" << findable
1710 << "NUsed=" << nused
1711 << "\n";
e4f2f73d 1712 }
e4f2f73d 1713
eb38ed55 1714 AliTRDtrackV1 *track = MakeTrack(&sseed[trackIndex*kNPlanes], trackParams);
e4f2f73d 1715 if(!track){
eb38ed55 1716 //AliWarning("Fail to build a TRD Track.");
e4f2f73d 1717 continue;
1718 }
eb38ed55 1719 //AliInfo("End of MakeTrack()");
e4f2f73d 1720 AliESDtrack esdTrack;
1721 esdTrack.UpdateTrackParams(track, AliESDtrack::kTRDout);
1722 esdTrack.SetLabel(track->GetLabel());
1723 new ((*esdTrackList)[ntracks0++]) AliESDtrack(esdTrack);
1724 ntracks1++;
1725 }
1726
1727 jSieve++;
1728 } while(jSieve<5 && candidates); // end track candidates sieve
1729 if(!ntracks1) break;
1730
1731 // increment counters
1732 ntracks2 += ntracks1;
1733 fSieveSeeding++;
1734
1735 // Rebuild plane configurations and indices taking only unused clusters into account
eb38ed55 1736 quality = BuildSeedingConfigs(stack, configs);
1737 if(quality < 1.E-7) break; //AliTRDReconstructor::RecoParam()->GetPlaneQualityThreshold()) break;
e4f2f73d 1738
eb38ed55 1739 for(Int_t ip = 0; ip < kNPlanes; ip++){
1740 if(!(chamber = stack[ip])) continue;
1741 chamber->Build(fGeom);//Indices(fSieveSeeding);
1742 }
e4f2f73d 1743
eb38ed55 1744 if(AliTRDReconstructor::StreamLevel() > 1){
1745 AliInfo(Form("Sieve level %d Plane config %d %d %d Quality %f", fSieveSeeding, configs[0], configs[1], configs[2], quality));
1746 }
e4f2f73d 1747 } while(fSieveSeeding<10); // end stack clusters sieve
1748
1749
1750
1751 //AliInfo(Form("Registered TRD tracks %d in stack %d.", ntracks2, pars[1]));
1752
1753 return ntracks2;
1754}
1755
1756//___________________________________________________________________
eb38ed55 1757Double_t AliTRDtrackerV1::BuildSeedingConfigs(AliTRDtrackingChamber **stack, Int_t *configs)
e4f2f73d 1758{
1759 //
1760 // Assign probabilities to chambers according to their
1761 // capability of producing seeds.
1762 //
1763 // Parameters :
1764 //
1765 // layers : Array of stack propagation layers for all 6 chambers in one stack
1766 // configs : On exit array of configuration indexes (see GetSeedingConfig()
1767 // for details) in the decreasing order of their seeding probabilities.
1768 //
1769 // Output :
1770 //
1771 // Return top configuration quality
1772 //
1773 // Detailed description:
1774 //
1775 // To each chamber seeding configuration (see GetSeedingConfig() for
1776 // the list of all configurations) one defines 2 quality factors:
1777 // - an apriori topological quality (see GetSeedingConfig() for details) and
1778 // - a data quality based on the uniformity of the distribution of
1779 // clusters over the x range (time bins population). See CookChamberQA() for details.
1780 // The overall chamber quality is given by the product of this 2 contributions.
1781 //
1782
eb38ed55 1783 Double_t chamberQ[kNPlanes];
1784 AliTRDtrackingChamber *chamber = 0x0;
e4f2f73d 1785 for(int iplane=0; iplane<kNPlanes; iplane++){
eb38ed55 1786 if(!(chamber = stack[iplane])) continue;
2985ffcb 1787 chamberQ[iplane] = (chamber = stack[iplane]) ? chamber->GetQuality() : 0.;
e4f2f73d 1788 }
1789
1790 Double_t tconfig[kNConfigs];
1791 Int_t planes[4];
1792 for(int iconf=0; iconf<kNConfigs; iconf++){
1793 GetSeedingConfig(iconf, planes);
d76231c8 1794 tconfig[iconf] = fgTopologicQA[iconf];
eb38ed55 1795 for(int iplane=0; iplane<4; iplane++) tconfig[iconf] *= chamberQ[planes[iplane]];
e4f2f73d 1796 }
1797
1798 TMath::Sort(kNConfigs, tconfig, configs, kTRUE);
eb38ed55 1799// AliInfo(Form("q[%d] = %f", configs[0], tconfig[configs[0]]));
1800// AliInfo(Form("q[%d] = %f", configs[1], tconfig[configs[1]]));
1801// AliInfo(Form("q[%d] = %f", configs[2], tconfig[configs[2]]));
1802
e4f2f73d 1803 return tconfig[configs[0]];
1804}
1805
1806//____________________________________________________________________
eb38ed55 1807Int_t AliTRDtrackerV1::MakeSeeds(AliTRDtrackingChamber **stack, AliTRDseedV1 *sseed, Int_t *ipar)
e4f2f73d 1808{
1809 //
1810 // Make tracklet seeds in the TRD stack.
1811 //
1812 // Parameters :
1813 // layers : Array of stack propagation layers containing clusters
1814 // sseed : Array of empty tracklet seeds. On exit they are filled.
1815 // ipar : Control parameters:
1816 // ipar[0] -> seeding chambers configuration
1817 // ipar[1] -> stack index
1818 // ipar[2] -> number of track candidates found so far
1819 //
1820 // Output :
1821 // Number of tracks candidates found.
1822 //
1823 // Detailed description
1824 //
1825 // The following steps are performed:
1826 // 1. Select seeding layers from seeding chambers
1827 // 2. Select seeding clusters from the seeding AliTRDpropagationLayerStack.
1828 // The clusters are taken from layer 3, layer 0, layer 1 and layer 2, in
1829 // this order. The parameters controling the range of accepted clusters in
eb38ed55 1830 // layer 0, 1, and 2 are defined in AliTRDchamberTimeBin::BuildCond().
e4f2f73d 1831 // 3. Helix fit of the cluster set. (see AliTRDtrackerFitter::FitRieman(AliTRDcluster**))
1832 // 4. Initialize seeding tracklets in the seeding chambers.
1833 // 5. Filter 0.
1834 // Chi2 in the Y direction less than threshold ... (1./(3. - sLayer))
1835 // Chi2 in the Z direction less than threshold ... (1./(3. - sLayer))
1836 // 6. Attach clusters to seeding tracklets and find linear approximation of
1837 // the tracklet (see AliTRDseedV1::AttachClustersIter()). The number of used
1838 // clusters used by current seeds should not exceed ... (25).
1839 // 7. Filter 1.
1840 // All 4 seeding tracklets should be correctly constructed (see
1841 // AliTRDseedV1::AttachClustersIter())
1842 // 8. Helix fit of the seeding tracklets
1843 // 9. Filter 2.
1844 // Likelihood calculation of the fit. (See AliTRDtrackerV1::CookLikelihood() for details)
1845 // 10. Extrapolation of the helix fit to the other 2 chambers:
1846 // a) Initialization of extrapolation tracklet with fit parameters
1847 // b) Helix fit of tracklets
1848 // c) Attach clusters and linear interpolation to extrapolated tracklets
1849 // d) Helix fit of tracklets
1850 // 11. Improve seeding tracklets quality by reassigning clusters.
1851 // See AliTRDtrackerV1::ImproveSeedQuality() for details.
1852 // 12. Helix fit of all 6 seeding tracklets and chi2 calculation
1853 // 13. Hyperplane fit and track quality calculation. See AliTRDtrackerFitter::FitHyperplane() for details.
1854 // 14. Cooking labels for tracklets. Should be done only for MC
1855 // 15. Register seeds.
1856 //
1857
eb38ed55 1858 AliTRDtrackingChamber *chamber = 0x0;
e4f2f73d 1859 AliTRDcluster *c[4] = {0x0, 0x0, 0x0, 0x0}; // initilize seeding clusters
1860 AliTRDseedV1 *cseed = &sseed[0]; // initialize tracklets for first track
1861 Int_t ncl, mcl; // working variable for looping over clusters
eb38ed55 1862 Int_t index[AliTRDchamberTimeBin::kMaxClustersLayer], jndex[AliTRDchamberTimeBin::kMaxClustersLayer];
e4f2f73d 1863 // chi2 storage
1864 // chi2[0] = tracklet chi2 on the Z direction
1865 // chi2[1] = tracklet chi2 on the R direction
1866 Double_t chi2[4];
1867
1868
1869 // this should be data member of AliTRDtrack
1870 Double_t seedQuality[kMaxTracksStack];
1871
1872 // unpack control parameters
1873 Int_t config = ipar[0];
eb38ed55 1874 Int_t ntracks = ipar[1];
e4f2f73d 1875 Int_t planes[kNSeedPlanes]; GetSeedingConfig(config, planes);
e4f2f73d 1876
1877 // Init chambers geometry
eb38ed55 1878 Int_t ic = 0; while(!(chamber = stack[ic])) ic++;
1879 Int_t istack = fGeom->GetChamber(chamber->GetDetector());
e4f2f73d 1880 Double_t hL[kNPlanes]; // Tilting angle
1881 Float_t padlength[kNPlanes]; // pad lenghts
eb38ed55 1882 AliTRDpadPlane *pp = 0x0;
1883 for(int iplane=0; iplane<kNPlanes; iplane++){
1884 pp = fGeom->GetPadPlane(iplane, istack);
1885 hL[iplane] = TMath::Tan(-TMath::DegToRad()*pp->GetTiltingAngle());
1886 padlength[iplane] = pp->GetLengthIPad();
1887 }
1888
1889 if(AliTRDReconstructor::StreamLevel() > 1){
1890 AliInfo(Form("Making seeds Stack[%d] Config[%d] Tracks[%d]...", istack, config, ntracks));
e4f2f73d 1891 }
1892
eb38ed55 1893 Int_t nlayers = 0;
1894 AliTRDchamberTimeBin *layer[] = {0x0, 0x0, 0x0, 0x0};
1895 for(int isl=0; isl<kNSeedPlanes; isl++){
1896 if(!(chamber = stack[planes[isl]])) continue;
1897 if(!(layer[isl] = chamber->GetSeedingLayer(fGeom))) continue;
1898 nlayers++;
1899 //AliInfo(Form("seeding plane %d clusters %d", planes[isl], Int_t(*layer[isl])));
1900 }
1901 if(nlayers < 4) return 0;
1902
1903
e4f2f73d 1904 // Start finding seeds
eb38ed55 1905 Double_t cond0[4], cond1[4], cond2[4];
e4f2f73d 1906 Int_t icl = 0;
1907 while((c[3] = (*layer[3])[icl++])){
1908 if(!c[3]) continue;
1909 layer[0]->BuildCond(c[3], cond0, 0);
1910 layer[0]->GetClusters(cond0, index, ncl);
eb38ed55 1911 //printf("Found c[3] candidates 0 %d\n", ncl);
e4f2f73d 1912 Int_t jcl = 0;
1913 while(jcl<ncl) {
1914 c[0] = (*layer[0])[index[jcl++]];
1915 if(!c[0]) continue;
1916 Double_t dx = c[3]->GetX() - c[0]->GetX();
1917 Double_t theta = (c[3]->GetZ() - c[0]->GetZ())/dx;
1918 Double_t phi = (c[3]->GetY() - c[0]->GetY())/dx;
1919 layer[1]->BuildCond(c[0], cond1, 1, theta, phi);
1920 layer[1]->GetClusters(cond1, jndex, mcl);
eb38ed55 1921 //printf("Found c[0] candidates 1 %d\n", mcl);
e4f2f73d 1922
1923 Int_t kcl = 0;
1924 while(kcl<mcl) {
1925 c[1] = (*layer[1])[jndex[kcl++]];
1926 if(!c[1]) continue;
1927 layer[2]->BuildCond(c[1], cond2, 2, theta, phi);
1928 c[2] = layer[2]->GetNearestCluster(cond2);
eb38ed55 1929 //printf("Found c[1] candidate 2 %p\n", c[2]);
e4f2f73d 1930 if(!c[2]) continue;
1931
eb38ed55 1932// AliInfo("Seeding clusters found. Building seeds ...");
1933// 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());
1934
e4f2f73d 1935 for (Int_t il = 0; il < 6; il++) cseed[il].Reset();
1936
eb38ed55 1937 FitRieman(c, chi2);
e4f2f73d 1938
e4f2f73d 1939 AliTRDseedV1 *tseed = 0x0;
1940 for(int iLayer=0; iLayer<kNSeedPlanes; iLayer++){
0906e73e 1941 Int_t jLayer = planes[iLayer];
1942 tseed = &cseed[jLayer];
0906e73e 1943 tseed->SetPlane(jLayer);
1944 tseed->SetTilt(hL[jLayer]);
1945 tseed->SetPadLength(padlength[jLayer]);
eb38ed55 1946 tseed->SetX0(stack[jLayer]->GetX());
1947 tseed->Init(GetRiemanFitter());
e4f2f73d 1948 }
1949
1950 Bool_t isFake = kFALSE;
e4f2f73d 1951 if(AliTRDReconstructor::StreamLevel() >= 2){
eb38ed55 1952 if (c[0]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
1953 if (c[1]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
1954 if (c[2]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
1955
1956 Float_t yref[4];
1957 for(int il=0; il<4; il++) yref[il] = cseed[planes[il]].GetYref(0);
e4f2f73d 1958 Int_t ll = c[3]->GetLabel(0);
eb38ed55 1959 TTreeSRedirector &cs0 = *fgDebugStreamer;
e4f2f73d 1960 cs0 << "MakeSeeds0"
1961 <<"isFake=" << isFake
1962 <<"label=" << ll
eb38ed55 1963 <<"chi2z=" << chi2[0]
1964 <<"chi2y=" << chi2[1]
1965 <<"yref0=" << yref[0]
1966 <<"yref1=" << yref[1]
1967 <<"yref2=" << yref[2]
1968 <<"yref3=" << yref[3]
1969 <<"c0.=" << c[0]
1970 <<"c1.=" << c[1]
1971 <<"c2.=" << c[2]
1972 <<"c3.=" << c[3]
e4f2f73d 1973 <<"\n";
1974 }
e4f2f73d 1975
eb38ed55 1976 if(chi2[0] > AliTRDReconstructor::RecoParam()->GetChi2Z()/*7./(3. - sLayer)*//*iter*/){
e4f2f73d 1977 //AliInfo(Form("Failed chi2 filter on chi2Z [%f].", chi2[0]));
1978 continue;
1979 }
eb38ed55 1980 if(chi2[1] > AliTRDReconstructor::RecoParam()->GetChi2Y()/*1./(3. - sLayer)*//*iter*/){
e4f2f73d 1981 //AliInfo(Form("Failed chi2 filter on chi2Y [%f].", chi2[1]));
1982 continue;
1983 }
1984 //AliInfo("Passed chi2 filter.");
1985
e4f2f73d 1986 if(AliTRDReconstructor::StreamLevel() >= 2){
1987 Float_t minmax[2] = { -100.0, 100.0 };
1988 for (Int_t iLayer = 0; iLayer < 4; iLayer++) {
1989 Float_t max = c[iLayer]->GetZ() + cseed[planes[iLayer]].GetPadLength() * 0.5 + 1.0 - cseed[planes[iLayer]].GetZref(0);
1990 if (max < minmax[1]) minmax[1] = max;
1991 Float_t min = c[iLayer]->GetZ()-cseed[planes[iLayer]].GetPadLength() * 0.5 - 1.0 - cseed[planes[iLayer]].GetZref(0);
1992 if (min > minmax[0]) minmax[0] = min;
1993 }
1994 Double_t xpos[4];
1995 for(Int_t l = 0; l < kNSeedPlanes; l++) xpos[l] = layer[l]->GetX();
eb38ed55 1996 TTreeSRedirector &cstreamer = *fgDebugStreamer;
e4f2f73d 1997 cstreamer << "MakeSeeds1"
1998 << "isFake=" << isFake
1999 << "config=" << config
2000 << "Cl0.=" << c[0]
2001 << "Cl1.=" << c[1]
2002 << "Cl2.=" << c[2]
2003 << "Cl3.=" << c[3]
2004 << "X0=" << xpos[0] //layer[sLayer]->GetX()
2005 << "X1=" << xpos[1] //layer[sLayer + 1]->GetX()
2006 << "X2=" << xpos[2] //layer[sLayer + 2]->GetX()
2007 << "X3=" << xpos[3] //layer[sLayer + 3]->GetX()
2008 << "Y2exp=" << cond2[0]
2009 << "Z2exp=" << cond2[1]
2010 << "Chi2R=" << chi2[0]
2011 << "Chi2Z=" << chi2[1]
2012 << "Seed0.=" << &cseed[planes[0]]
2013 << "Seed1.=" << &cseed[planes[1]]
2014 << "Seed2.=" << &cseed[planes[2]]
2015 << "Seed3.=" << &cseed[planes[3]]
2016 << "Zmin=" << minmax[0]
2017 << "Zmax=" << minmax[1]
2018 << "\n" ;
2019 }
eb38ed55 2020
e4f2f73d 2021 // try attaching clusters to tracklets
2022 Int_t nUsedCl = 0;
2023 Int_t nlayers = 0;
2024 for(int iLayer=0; iLayer<kNSeedPlanes; iLayer++){
0906e73e 2025 Int_t jLayer = planes[iLayer];
eb38ed55 2026 if(!cseed[jLayer].AttachClustersIter(stack[jLayer], 5., kFALSE, c[iLayer])) continue;
0906e73e 2027 nUsedCl += cseed[jLayer].GetNUsed();
e4f2f73d 2028 if(nUsedCl > 25) break;
2029 nlayers++;
2030 }
2031 if(nlayers < kNSeedPlanes){
eb38ed55 2032 //AliInfo(Form("Failed updating all seeds %d [%d].", nlayers, kNSeedPlanes));
e4f2f73d 2033 continue;
2034 }
2035 // fit tracklets and cook likelihood
eb38ed55 2036 FitRieman(&cseed[0], chi2, &planes[0]);
e4f2f73d 2037 Double_t like = CookLikelihood(&cseed[0], planes, chi2); // to be checked
eb38ed55 2038 if (TMath::Log(1.E-9 + like) < AliTRDReconstructor::RecoParam()->GetTrackLikelihood()){
e4f2f73d 2039 //AliInfo(Form("Failed likelihood %f[%e].", TMath::Log(1.E-9 + like), like));
2040 continue;
2041 }
2042 //AliInfo(Form("Passed likelihood %f[%e].", TMath::Log(1.E-9 + like), like));
2043
2044
2045 // book preliminary results
2046 seedQuality[ntracks] = like;
2047 fSeedLayer[ntracks] = config;/*sLayer;*/
2048
2049 // attach clusters to the extrapolation seeds
2050 Int_t lextrap[2];
2051 GetExtrapolationConfig(config, lextrap);
2052 Int_t nusedf = 0; // debug value
2053 for(int iLayer=0; iLayer<2; iLayer++){
2054 Int_t jLayer = lextrap[iLayer];
eb38ed55 2055 if(!(chamber = stack[jLayer])) continue;
2056
e4f2f73d 2057 // prepare extrapolated seed
2058 cseed[jLayer].Reset();
0906e73e 2059 cseed[jLayer].SetPlane(jLayer);
e4f2f73d 2060 cseed[jLayer].SetTilt(hL[jLayer]);
eb38ed55 2061 cseed[jLayer].SetX0(chamber->GetX());
0906e73e 2062 cseed[jLayer].SetPadLength(padlength[jLayer]);
e4f2f73d 2063
2064 // fit extrapolated seed
eb38ed55 2065 FitTiltedRieman(cseed, kTRUE);
e4f2f73d 2066 if ((jLayer == 0) && !(cseed[1].IsOK())) continue;
2067 if ((jLayer == 5) && !(cseed[4].IsOK())) continue;
2068 AliTRDseedV1 tseed = cseed[jLayer];
eb38ed55 2069 if(!tseed.AttachClustersIter(chamber, 1000.)) continue;
e4f2f73d 2070 cseed[jLayer] = tseed;
2071 nusedf += cseed[jLayer].GetNUsed(); // debug value
e4f2f73d 2072 }
eb38ed55 2073 FitTiltedRieman(cseed, kTRUE);
e4f2f73d 2074 //AliInfo("Extrapolation done.");
2075
eb38ed55 2076 if(ImproveSeedQuality(stack, cseed) < 4) continue;
e4f2f73d 2077 //AliInfo("Improve seed quality done.");
2078
e4f2f73d 2079 // fit full track and cook likelihoods
eb38ed55 2080 Double_t curv = FitRieman(&cseed[0], chi2);
2081 Double_t chi2ZF = chi2[0] / TMath::Max((nlayers - 3.), 1.);
2082 Double_t chi2RF = chi2[1] / TMath::Max((nlayers - 3.), 1.);
2083
2084 // do the final track fitting (Once with vertex constraint and once without vertex constraint)
2085 Double_t chi2Vals[3];
2086 chi2Vals[0] = FitTiltedRieman(&cseed[0], kFALSE);
2087 chi2Vals[1] = FitTiltedRiemanConstraint(&cseed[0], GetZ());
2088 chi2Vals[2] = chi2ZF;
2089 fTrackQuality[ntracks] = CalculateTrackLikelihood(&cseed[0], &chi2Vals[0]);
e4f2f73d 2090 //AliInfo("Hyperplane fit done\n");
2091
2092 // finalize tracklets
2093 Int_t labels[12];
2094 Int_t outlab[24];
2095 Int_t nlab = 0;
2096 for (Int_t iLayer = 0; iLayer < 6; iLayer++) {
2097 if (!cseed[iLayer].IsOK()) continue;
2098
2099 if (cseed[iLayer].GetLabels(0) >= 0) {
2100 labels[nlab] = cseed[iLayer].GetLabels(0);
2101 nlab++;
2102 }
2103
2104 if (cseed[iLayer].GetLabels(1) >= 0) {
2105 labels[nlab] = cseed[iLayer].GetLabels(1);
2106 nlab++;
2107 }
2108 }
2109 Freq(nlab,labels,outlab,kFALSE);
2110 Int_t label = outlab[0];
2111 Int_t frequency = outlab[1];
2112 for (Int_t iLayer = 0; iLayer < 6; iLayer++) {
2113 cseed[iLayer].SetFreq(frequency);
e4f2f73d 2114 cseed[iLayer].SetChi2Z(chi2ZF);
2115 }
2116
e4f2f73d 2117 if(AliTRDReconstructor::StreamLevel() >= 2){
eb38ed55 2118 TTreeSRedirector &cstreamer = *fgDebugStreamer;
e4f2f73d 2119 cstreamer << "MakeSeeds2"
2120 << "C=" << curv
e4f2f73d 2121 << "Chi2TR=" << chi2[0]
2122 << "Chi2TC=" << chi2[1]
2123 << "Chi2RF=" << chi2RF
2124 << "Chi2ZF=" << chi2ZF
e4f2f73d 2125 << "Nlayers=" << nlayers
2126 << "NUsedS=" << nUsedCl
2127 << "NUsed=" << nusedf
e4f2f73d 2128 << "Like=" << like
2129 << "S0.=" << &cseed[0]
2130 << "S1.=" << &cseed[1]
2131 << "S2.=" << &cseed[2]
2132 << "S3.=" << &cseed[3]
2133 << "S4.=" << &cseed[4]
2134 << "S5.=" << &cseed[5]
2135 << "Label=" << label
2136 << "Freq=" << frequency
2137 << "\n";
2138 }
e4f2f73d 2139
2140 ntracks++;
2141 if(ntracks == kMaxTracksStack){
2142 AliWarning(Form("Number of seeds reached maximum allowed (%d) in stack.", kMaxTracksStack));
eb38ed55 2143 for(int isl=0; isl<4; isl++) delete layer[isl];
e4f2f73d 2144 return ntracks;
2145 }
2146 cseed += 6;
2147 }
2148 }
2149 }
2150 for(int isl=0; isl<4; isl++) delete layer[isl];
2151
2152 return ntracks;
2153}
2154
2155//_____________________________________________________________________________
0906e73e 2156AliTRDtrackV1* AliTRDtrackerV1::MakeTrack(AliTRDseedV1 *seeds, Double_t *params)
e4f2f73d 2157{
2158 //
2159 // Build a TRD track out of tracklet candidates
2160 //
2161 // Parameters :
2162 // seeds : array of tracklets
2163 // params : track parameters (see MakeSeeds() function body for a detailed description)
2164 //
2165 // Output :
2166 // The TRD track.
2167 //
2168 // Detailed description
2169 //
2170 // To be discussed with Marian !!
2171 //
2172
e4f2f73d 2173 Double_t alpha = AliTRDgeometry::GetAlpha();
2174 Double_t shift = AliTRDgeometry::GetAlpha()/2.0;
2175 Double_t c[15];
2176
2177 c[ 0] = 0.2;
2178 c[ 1] = 0.0; c[ 2] = 2.0;
2179 c[ 3] = 0.0; c[ 4] = 0.0; c[ 5] = 0.02;
2180 c[ 6] = 0.0; c[ 7] = 0.0; c[ 8] = 0.0; c[ 9] = 0.1;
2181 c[10] = 0.0; c[11] = 0.0; c[12] = 0.0; c[13] = 0.0; c[14] = params[5]*params[5]*0.01;
2182
0906e73e 2183 AliTRDtrackV1 *track = new AliTRDtrackV1(seeds, &params[1], c, params[0], params[6]*alpha+shift);
e4f2f73d 2184 track->PropagateTo(params[0]-5.0);
2185 track->ResetCovariance(1);
0906e73e 2186 Int_t nc = FollowBackProlongation(*track);
eb38ed55 2187 //AliInfo(Form("N clusters for track %d", nc));
0906e73e 2188 if (nc < 30) {
e4f2f73d 2189 delete track;
0906e73e 2190 track = 0x0;
2191 } else {
2192// track->CookdEdx();
2193// track->CookdEdxTimBin(-1);
2194// CookLabel(track, 0.9);
e4f2f73d 2195 }
2196
2197 return track;
2198}
2199
2200//____________________________________________________________________
0906e73e 2201void AliTRDtrackerV1::CookLabel(AliKalmanTrack */*pt*/, Float_t /*wrong*/) const
2202{
2203 // to be implemented, preferably at the level of TRD tracklet. !!!!!!!
2204}
2205
2206//____________________________________________________________________
eb38ed55 2207Int_t AliTRDtrackerV1::ImproveSeedQuality(AliTRDtrackingChamber **stack, AliTRDseedV1 *cseed)
e4f2f73d 2208{
2209 //
2210 // Sort tracklets according to "quality" and try to "improve" the first 4 worst
2211 //
2212 // Parameters :
2213 // layers : Array of propagation layers for a stack/supermodule
2214 // cseed : Array of 6 seeding tracklets which has to be improved
2215 //
2216 // Output :
2217 // cssed : Improved seeds
2218 //
2219 // Detailed description
2220 //
2221 // Iterative procedure in which new clusters are searched for each
2222 // tracklet seed such that the seed quality (see AliTRDseed::GetQuality())
2223 // can be maximized. If some optimization is found the old seeds are replaced.
2224 //
2225
e4f2f73d 2226 // make a local working copy
eb38ed55 2227 AliTRDtrackingChamber *chamber = 0x0;
e4f2f73d 2228 AliTRDseedV1 bseed[6];
eb38ed55 2229 Int_t nLayers = 0;
e4f2f73d 2230 for (Int_t jLayer = 0; jLayer < 6; jLayer++) bseed[jLayer] = cseed[jLayer];
eb38ed55 2231
e4f2f73d 2232 Float_t lastquality = 10000.0;
2233 Float_t lastchi2 = 10000.0;
2234 Float_t chi2 = 1000.0;
2235
2236 for (Int_t iter = 0; iter < 4; iter++) {
2237 Float_t sumquality = 0.0;
2238 Float_t squality[6];
2239 Int_t sortindexes[6];
2240
2241 for (Int_t jLayer = 0; jLayer < 6; jLayer++) {
2242 squality[jLayer] = bseed[jLayer].IsOK() ? bseed[jLayer].GetQuality(kTRUE) : -1.;
eb38ed55 2243 sumquality += squality[jLayer];
e4f2f73d 2244 }
2245 if ((sumquality >= lastquality) || (chi2 > lastchi2)) break;
2246
eb38ed55 2247 nLayers = 0;
e4f2f73d 2248 lastquality = sumquality;
2249 lastchi2 = chi2;
2250 if (iter > 0) for (Int_t jLayer = 0; jLayer < 6; jLayer++) cseed[jLayer] = bseed[jLayer];
2251
e4f2f73d 2252 TMath::Sort(6, squality, sortindexes, kFALSE);
2253 for (Int_t jLayer = 5; jLayer > 1; jLayer--) {
2254 Int_t bLayer = sortindexes[jLayer];
eb38ed55 2255 if(!(chamber = stack[bLayer])) continue;
2256 bseed[bLayer].AttachClustersIter(chamber, squality[bLayer], kTRUE);
2257 if(bseed[bLayer].IsOK()) nLayers++;
e4f2f73d 2258 }
2259
eb38ed55 2260 chi2 = FitTiltedRieman(bseed, kTRUE);
e4f2f73d 2261 } // Loop: iter
eb38ed55 2262
2263 // we are sure that at least 2 tracklets are OK !
2264 return nLayers+2;
e4f2f73d 2265}
2266
eb38ed55 2267//_________________________________________________________________________
2268Double_t AliTRDtrackerV1::CalculateTrackLikelihood(AliTRDseedV1 *tracklets, Double_t *chi2){
2269//
2270// Calculates the Track Likelihood value. This parameter serves as main quality criterion for
2271// the track selection
2272// The likelihood value containes:
2273// - The chi2 values from the both fitters and the chi2 values in z-direction from a linear fit
2274// - The Sum of the Parameter |slope_ref - slope_fit|/Sigma of the tracklets
2275// For all Parameters an exponential dependency is used
2276//
2277// Parameters: - Array of tracklets (AliTRDseedV1) related to the track candidate
2278// - Array of chi2 values:
2279// * Non-Constrained Tilted Riemann fit
2280// * Vertex-Constrained Tilted Riemann fit
2281// * z-Direction from Linear fit
2282// Output: - The calculated track likelihood
2283//
2284// debug level 2
2285//
e4f2f73d 2286
eb38ed55 2287 Double_t sumdaf = 0, nLayers = 0;
2288 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
2289 if(!tracklets[iLayer].IsOK()) continue;
2290 sumdaf += TMath::Abs((tracklets[iLayer].GetYfit(1) - tracklets[iLayer].GetYref(1))/ tracklets[iLayer].GetSigmaY2());
2291 nLayers++;
e4f2f73d 2292 }
eb38ed55 2293 sumdaf /= Float_t (nLayers - 2.0);
e4f2f73d 2294
eb38ed55 2295 Double_t likeChi2Z = TMath::Exp(-chi2[2] * 0.14); // Chi2Z
2296 Double_t likeChi2TC = TMath::Exp(-chi2[1] * 0.677); // Constrained Tilted Riemann
2297 Double_t likeChi2TR = TMath::Exp(-chi2[0] * 0.78); // Non-constrained Tilted Riemann
2298 Double_t likeAF = TMath::Exp(-sumdaf * 3.23);
2299 Double_t trackLikelihood = likeChi2Z * likeChi2TR * likeAF;
2300
2301 if(AliTRDReconstructor::StreamLevel() >= 2){
2302 TTreeSRedirector &cstreamer = *fgDebugStreamer;
2303 cstreamer << "CalculateTrackLikelihood0"
2304 << "LikeChi2Z=" << likeChi2Z
2305 << "LikeChi2TR=" << likeChi2TR
2306 << "LikeChi2TC=" << likeChi2TC
2307 << "LikeAF=" << likeAF
2308 << "TrackLikelihood=" << trackLikelihood
2309 << "\n";
2310 }
2311
2312 return trackLikelihood;
e4f2f73d 2313}
2314
2315//____________________________________________________________________
eb38ed55 2316Double_t AliTRDtrackerV1::CookLikelihood(AliTRDseedV1 *cseed, Int_t planes[4]
e4f2f73d 2317 , Double_t *chi2)
2318{
2319 //
2320 // Calculate the probability of this track candidate.
2321 //
2322 // Parameters :
2323 // cseeds : array of candidate tracklets
2324 // planes : array of seeding planes (see seeding configuration)
2325 // chi2 : chi2 values (on the Z and Y direction) from the rieman fit of the track.
2326 //
2327 // Output :
2328 // likelihood value
2329 //
2330 // Detailed description
2331 //
2332 // The track quality is estimated based on the following 4 criteria:
2333 // 1. precision of the rieman fit on the Y direction (likea)
2334 // 2. chi2 on the Y direction (likechi2y)
2335 // 3. chi2 on the Z direction (likechi2z)
2336 // 4. number of attached clusters compared to a reference value
2337 // (see AliTRDrecoParam::fkFindable) (likeN)
2338 //
2339 // The distributions for each type of probabilities are given below as of
2340 // (date). They have to be checked to assure consistency of estimation.
2341 //
2342
e4f2f73d 2343 // ratio of the total number of clusters/track which are expected to be found by the tracker.
eb38ed55 2344 Float_t fgFindable = AliTRDReconstructor::RecoParam()->GetFindableClusters();
e4f2f73d 2345
2346
2347 Int_t nclusters = 0;
2348 Double_t sumda = 0.;
2349 for(UChar_t ilayer = 0; ilayer < 4; ilayer++){
2350 Int_t jlayer = planes[ilayer];
2351 nclusters += cseed[jlayer].GetN2();
2352 sumda += TMath::Abs(cseed[jlayer].GetYfitR(1) - cseed[jlayer].GetYref(1));
2353 }
2354 Double_t likea = TMath::Exp(-sumda*10.6);
2355 Double_t likechi2y = 0.0000000001;
2356 if (chi2[1] < 0.5) likechi2y += TMath::Exp(-TMath::Sqrt(chi2[1]) * 7.73);
2357 Double_t likechi2z = TMath::Exp(-chi2[0] * 0.088) / TMath::Exp(-chi2[0] * 0.019);
2985ffcb 2358 Int_t enc = Int_t(fgFindable*4.*fgNTimeBins); // Expected Number Of Clusters, normally 72
e4f2f73d 2359 Double_t likeN = TMath::Exp(-(enc - nclusters) * 0.19);
2360
2361 Double_t like = likea * likechi2y * likechi2z * likeN;
2362
e4f2f73d 2363 //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));
2364 if(AliTRDReconstructor::StreamLevel() >= 2){
eb38ed55 2365 TTreeSRedirector &cstreamer = *fgDebugStreamer;
e4f2f73d 2366 cstreamer << "CookLikelihood"
2367 << "sumda=" << sumda
2368 << "chi0=" << chi2[0]
2369 << "chi1=" << chi2[1]
2370 << "likea=" << likea
2371 << "likechi2y=" << likechi2y
2372 << "likechi2z=" << likechi2z
2373 << "nclusters=" << nclusters
2374 << "likeN=" << likeN
2375 << "like=" << like
2376 << "\n";
2377 }
e4f2f73d 2378
2379 return like;
2380}
2381
eb38ed55 2382
e4f2f73d 2383
2384//____________________________________________________________________
0906e73e 2385void AliTRDtrackerV1::GetSeedingConfig(Int_t iconfig, Int_t planes[4])
e4f2f73d 2386{
2387 //
2388 // Map seeding configurations to detector planes.
2389 //
2390 // Parameters :
2391 // iconfig : configuration index
2392 // planes : member planes of this configuration. On input empty.
2393 //
2394 // Output :
2395 // planes : contains the planes which are defining the configuration
2396 //
2397 // Detailed description
2398 //
2399 // Here is the list of seeding planes configurations together with
2400 // their topological classification:
2401 //
2402 // 0 - 5432 TQ 0
2403 // 1 - 4321 TQ 0
2404 // 2 - 3210 TQ 0
2405 // 3 - 5321 TQ 1
2406 // 4 - 4210 TQ 1
2407 // 5 - 5431 TQ 1
2408 // 6 - 4320 TQ 1
2409 // 7 - 5430 TQ 2
2410 // 8 - 5210 TQ 2
2411 // 9 - 5421 TQ 3
2412 // 10 - 4310 TQ 3
2413 // 11 - 5410 TQ 4
2414 // 12 - 5420 TQ 5
2415 // 13 - 5320 TQ 5
2416 // 14 - 5310 TQ 5
2417 //
2418 // The topologic quality is modeled as follows:
2419 // 1. The general model is define by the equation:
2420 // p(conf) = exp(-conf/2)
2421 // 2. According to the topologic classification, configurations from the same
2422 // class are assigned the agerage value over the model values.
2423 // 3. Quality values are normalized.
2424 //
2425 // The topologic quality distribution as function of configuration is given below:
2426 //Begin_Html
2427 // <img src="gif/topologicQA.gif">
2428 //End_Html
2429 //
2430
2431 switch(iconfig){
2432 case 0: // 5432 TQ 0
2433 planes[0] = 2;
2434 planes[1] = 3;
2435 planes[2] = 4;
2436 planes[3] = 5;
2437 break;
2438 case 1: // 4321 TQ 0
2439 planes[0] = 1;
2440 planes[1] = 2;
2441 planes[2] = 3;
2442 planes[3] = 4;
2443 break;
2444 case 2: // 3210 TQ 0
2445 planes[0] = 0;
2446 planes[1] = 1;
2447 planes[2] = 2;
2448 planes[3] = 3;
2449 break;
2450 case 3: // 5321 TQ 1
2451 planes[0] = 1;
2452 planes[1] = 2;
2453 planes[2] = 3;
2454 planes[3] = 5;
2455 break;
2456 case 4: // 4210 TQ 1
2457 planes[0] = 0;
2458 planes[1] = 1;
2459 planes[2] = 2;
2460 planes[3] = 4;
2461 break;
2462 case 5: // 5431 TQ 1
2463 planes[0] = 1;
2464 planes[1] = 3;
2465 planes[2] = 4;
2466 planes[3] = 5;
2467 break;
2468 case 6: // 4320 TQ 1
2469 planes[0] = 0;
2470 planes[1] = 2;
2471 planes[2] = 3;
2472 planes[3] = 4;
2473 break;
2474 case 7: // 5430 TQ 2
2475 planes[0] = 0;
2476 planes[1] = 3;
2477 planes[2] = 4;
2478 planes[3] = 5;
2479 break;
2480 case 8: // 5210 TQ 2
2481 planes[0] = 0;
2482 planes[1] = 1;
2483 planes[2] = 2;
2484 planes[3] = 5;
2485 break;
2486 case 9: // 5421 TQ 3
2487 planes[0] = 1;
2488 planes[1] = 2;
2489 planes[2] = 4;
2490 planes[3] = 5;
2491 break;
2492 case 10: // 4310 TQ 3
2493 planes[0] = 0;
2494 planes[1] = 1;
2495 planes[2] = 3;
2496 planes[3] = 4;
2497 break;
2498 case 11: // 5410 TQ 4
2499 planes[0] = 0;
2500 planes[1] = 1;
2501 planes[2] = 4;
2502 planes[3] = 5;
2503 break;
2504 case 12: // 5420 TQ 5
2505 planes[0] = 0;
2506 planes[1] = 2;
2507 planes[2] = 4;
2508 planes[3] = 5;
2509 break;
2510 case 13: // 5320 TQ 5
2511 planes[0] = 0;
2512 planes[1] = 2;
2513 planes[2] = 3;
2514 planes[3] = 5;
2515 break;
2516 case 14: // 5310 TQ 5
2517 planes[0] = 0;
2518 planes[1] = 1;
2519 planes[2] = 3;
2520 planes[3] = 5;
2521 break;
2522 }
2523}
2524
2525//____________________________________________________________________
0906e73e 2526void AliTRDtrackerV1::GetExtrapolationConfig(Int_t iconfig, Int_t planes[2])
e4f2f73d 2527{
2528 //
2529 // Returns the extrapolation planes for a seeding configuration.
2530 //
2531 // Parameters :
2532 // iconfig : configuration index
2533 // planes : planes which are not in this configuration. On input empty.
2534 //
2535 // Output :
2536 // planes : contains the planes which are not in the configuration
2537 //
2538 // Detailed description
2539 //
2540
2541 switch(iconfig){
2542 case 0: // 5432 TQ 0
2543 planes[0] = 1;
2544 planes[1] = 0;
2545 break;
2546 case 1: // 4321 TQ 0
2547 planes[0] = 5;
2548 planes[1] = 0;
2549 break;
2550 case 2: // 3210 TQ 0
2551 planes[0] = 4;
2552 planes[1] = 5;
2553 break;
2554 case 3: // 5321 TQ 1
2555 planes[0] = 4;
2556 planes[1] = 0;
2557 break;
2558 case 4: // 4210 TQ 1
2559 planes[0] = 5;
2560 planes[1] = 3;
2561 break;
2562 case 5: // 5431 TQ 1
2563 planes[0] = 2;
2564 planes[1] = 0;
2565 break;
2566 case 6: // 4320 TQ 1
2567 planes[0] = 5;
2568 planes[1] = 1;
2569 break;
2570 case 7: // 5430 TQ 2
2571 planes[0] = 2;
2572 planes[1] = 1;
2573 break;
2574 case 8: // 5210 TQ 2
2575 planes[0] = 4;
2576 planes[1] = 3;
2577 break;
2578 case 9: // 5421 TQ 3
2579 planes[0] = 3;
2580 planes[1] = 0;
2581 break;
2582 case 10: // 4310 TQ 3
2583 planes[0] = 5;
2584 planes[1] = 2;
2585 break;
2586 case 11: // 5410 TQ 4
2587 planes[0] = 3;
2588 planes[1] = 2;
2589 break;
2590 case 12: // 5420 TQ 5
2591 planes[0] = 3;
2592 planes[1] = 1;
2593 break;
2594 case 13: // 5320 TQ 5
2595 planes[0] = 4;
2596 planes[1] = 1;
2597 break;
2598 case 14: // 5310 TQ 5
2599 planes[0] = 4;
2600 planes[1] = 2;
2601 break;
2602 }
2603}
eb38ed55 2604
2605//____________________________________________________________________
2606AliCluster* AliTRDtrackerV1::GetCluster(Int_t idx) const
2607{
2608 Int_t ncls = fClusters->GetEntriesFast();
2609 return idx >= 0 || idx < ncls ? (AliCluster*)fClusters->UncheckedAt(idx) : 0x0;
2610}
2611
2612
2613//_____________________________________________________________________________
2614Int_t AliTRDtrackerV1::Freq(Int_t n, const Int_t *inlist
2615 , Int_t *outlist, Bool_t down)
2616{
2617 //
2618 // Sort eleements according occurancy
2619 // The size of output array has is 2*n
2620 //
2621
2622 if (n <= 0) {
2623 return 0;
2624 }
2625
2626 Int_t *sindexS = new Int_t[n]; // Temporary array for sorting
2627 Int_t *sindexF = new Int_t[2*n];
2628 for (Int_t i = 0; i < n; i++) {
2629 sindexF[i] = 0;
2630 }
2631
2632 TMath::Sort(n,inlist,sindexS,down);
2633
2634 Int_t last = inlist[sindexS[0]];
2635 Int_t val = last;
2636 sindexF[0] = 1;
2637 sindexF[0+n] = last;
2638 Int_t countPos = 0;
2639
2640 // Find frequency
2641 for (Int_t i = 1; i < n; i++) {
2642 val = inlist[sindexS[i]];
2643 if (last == val) {
2644 sindexF[countPos]++;
2645 }
2646 else {
2647 countPos++;
2648 sindexF[countPos+n] = val;
2649 sindexF[countPos]++;
2650 last = val;
2651 }
2652 }
2653 if (last == val) {
2654 countPos++;
2655 }
2656
2657 // Sort according frequency
2658 TMath::Sort(countPos,sindexF,sindexS,kTRUE);
2659
2660 for (Int_t i = 0; i < countPos; i++) {
2661 outlist[2*i ] = sindexF[sindexS[i]+n];
2662 outlist[2*i+1] = sindexF[sindexS[i]];
2663 }
2664
2665 delete [] sindexS;
2666 delete [] sindexF;
2667
2668 return countPos;
2669
2670}