datamember added in AliGeomManager with number of alignable volumes per subdetector...
[u/mrichter/AliRoot.git] / TRD / AliTRDtrackerV1.cxx
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bcb6fb78 1
e4f2f73d 2/**************************************************************************
972ef65e 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**************************************************************************/
e4f2f73d 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
bb56afff 29// #include <Riostream.h>
30// #include <stdio.h>
31// #include <string.h>
e4f2f73d 32
33#include <TBranch.h>
bb56afff 34#include <TDirectory.h>
e4f2f73d 35#include <TLinearFitter.h>
e4f2f73d 36#include <TTree.h>
37#include <TClonesArray.h>
e4f2f73d 38#include <TTreeStream.h>
39
40#include "AliLog.h"
41#include "AliESDEvent.h"
bb56afff 42#include "AliGeomManager.h"
e4f2f73d 43#include "AliRieman.h"
44#include "AliTrackPointArray.h"
45
e4f2f73d 46#include "AliTRDgeometry.h"
47#include "AliTRDpadPlane.h"
e4f2f73d 48#include "AliTRDcalibDB.h"
e4f2f73d 49#include "AliTRDReconstructor.h"
50#include "AliTRDCalibraFillHisto.h"
e4f2f73d 51#include "AliTRDrecoParam.h"
bb56afff 52
53#include "AliTRDcluster.h"
e4f2f73d 54#include "AliTRDseedV1.h"
0906e73e 55#include "AliTRDtrackV1.h"
bb56afff 56#include "AliTRDtrackerV1.h"
57#include "AliTRDtrackerDebug.h"
58#include "AliTRDtrackingChamber.h"
59#include "AliTRDchamberTimeBin.h"
60
e4f2f73d 61
e4f2f73d 62
63ClassImp(AliTRDtrackerV1)
eb38ed55 64
65
66const Float_t AliTRDtrackerV1::fgkMinClustersInTrack = 0.5; //
67const Float_t AliTRDtrackerV1::fgkLabelFraction = 0.8; //
68const Double_t AliTRDtrackerV1::fgkMaxChi2 = 12.0; //
69const Double_t AliTRDtrackerV1::fgkMaxSnp = 0.95; // Maximum local sine of the azimuthal angle
70const Double_t AliTRDtrackerV1::fgkMaxStep = 2.0; // Maximal step size in propagation
d76231c8 71Double_t AliTRDtrackerV1::fgTopologicQA[kNConfigs] = {
41702fec 72 0.1112, 0.1112, 0.1112, 0.0786, 0.0786,
73 0.0786, 0.0786, 0.0579, 0.0579, 0.0474,
74 0.0474, 0.0408, 0.0335, 0.0335, 0.0335
e4f2f73d 75};
2985ffcb 76Int_t AliTRDtrackerV1::fgNTimeBins = 0;
eb38ed55 77TTreeSRedirector *AliTRDtrackerV1::fgDebugStreamer = 0x0;
78AliRieman* AliTRDtrackerV1::fgRieman = 0x0;
79TLinearFitter* AliTRDtrackerV1::fgTiltedRieman = 0x0;
80TLinearFitter* AliTRDtrackerV1::fgTiltedRiemanConstrained = 0x0;
e4f2f73d 81
82//____________________________________________________________________
3a039a31 83AliTRDtrackerV1::AliTRDtrackerV1(AliTRDReconstructor *rec)
41702fec 84 :AliTracker()
06b32d95 85 ,fReconstructor(0x0)
41702fec 86 ,fGeom(new AliTRDgeometry())
87 ,fClusters(0x0)
88 ,fTracklets(0x0)
89 ,fTracks(0x0)
90 ,fSieveSeeding(0)
e4f2f73d 91{
41702fec 92 //
93 // Default constructor.
94 //
a7ac01d2 95 AliTRDcalibDB *trd = 0x0;
96 if (!(trd = AliTRDcalibDB::Instance())) {
41702fec 97 AliFatal("Could not get calibration object");
98 }
a7ac01d2 99
100 if(!fgNTimeBins) fgNTimeBins = trd->GetNumberOfTimeBins();
41702fec 101
053767a4 102 for (Int_t isector = 0; isector < AliTRDgeometry::kNsector; isector++) new(&fTrSec[isector]) AliTRDtrackingSector(fGeom, isector);
3a039a31 103
d611c74f 104 for(Int_t isl =0; isl<kNSeedPlanes; isl++) fSeedTB[isl] = 0x0;
d20df6fc 105
3a039a31 106 // Initialize debug stream
06b32d95 107 if(rec) SetReconstructor(rec);
eb38ed55 108}
109
e4f2f73d 110//____________________________________________________________________
111AliTRDtrackerV1::~AliTRDtrackerV1()
112{
41702fec 113 //
114 // Destructor
115 //
116
117 if(fgDebugStreamer) delete fgDebugStreamer;
118 if(fgRieman) delete fgRieman;
119 if(fgTiltedRieman) delete fgTiltedRieman;
120 if(fgTiltedRiemanConstrained) delete fgTiltedRiemanConstrained;
d611c74f 121 for(Int_t isl =0; isl<kNSeedPlanes; isl++) if(fSeedTB[isl]) delete fSeedTB[isl];
41702fec 122 if(fTracks) {fTracks->Delete(); delete fTracks;}
123 if(fTracklets) {fTracklets->Delete(); delete fTracklets;}
48f8adf3 124 if(fClusters) {
125 fClusters->Delete(); delete fClusters;
126 }
41702fec 127 if(fGeom) delete fGeom;
e4f2f73d 128}
129
130//____________________________________________________________________
131Int_t AliTRDtrackerV1::Clusters2Tracks(AliESDEvent *esd)
132{
41702fec 133 //
134 // Steering stand alone tracking for full TRD detector
135 //
136 // Parameters :
137 // esd : The ESD event. On output it contains
138 // the ESD tracks found in TRD.
139 //
140 // Output :
141 // Number of tracks found in the TRD detector.
142 //
143 // Detailed description
144 // 1. Launch individual SM trackers.
145 // See AliTRDtrackerV1::Clusters2TracksSM() for details.
146 //
147
3a039a31 148 if(!fReconstructor->GetRecoParam() ){
149 AliError("Reconstruction configuration not initialized. Call first AliTRDReconstructor::SetRecoParam().");
41702fec 150 return 0;
151 }
152
153 //AliInfo("Start Track Finder ...");
154 Int_t ntracks = 0;
053767a4 155 for(int ism=0; ism<AliTRDgeometry::kNsector; ism++){
41702fec 156 // for(int ism=1; ism<2; ism++){
157 //AliInfo(Form("Processing supermodule %i ...", ism));
158 ntracks += Clusters2TracksSM(ism, esd);
159 }
160 AliInfo(Form("Number of found tracks : %d", ntracks));
161 return ntracks;
e4f2f73d 162}
163
0906e73e 164
165//_____________________________________________________________________________
eb38ed55 166Bool_t AliTRDtrackerV1::GetTrackPoint(Int_t index, AliTrackPoint &p) const
0906e73e 167{
41702fec 168 //AliInfo(Form("Asking for tracklet %d", index));
169
2f7514a6 170 AliTRDseedV1 *tracklet = GetTracklet(index);
171 if (!tracklet) return kFALSE;
41702fec 172
173 // get detector for this tracklet
174 AliTRDcluster *cl = 0x0;
4f57cad7 175 Int_t ic = 0; do {} while(!(cl = tracklet->GetClusters(ic++)));
41702fec 176 Int_t idet = cl->GetDetector();
177
178 Double_t local[3];
179 local[0] = tracklet->GetX0();
180 local[1] = tracklet->GetYfit(0);
181 local[2] = tracklet->GetZfit(0);
182 Double_t global[3];
183 fGeom->RotateBack(idet, local, global);
184 p.SetXYZ(global[0],global[1],global[2]);
185
186
187 // setting volume id
188 AliGeomManager::ELayerID iLayer = AliGeomManager::kTRD1;
053767a4 189 switch (fGeom->GetLayer(idet)) {
41702fec 190 case 0:
191 iLayer = AliGeomManager::kTRD1;
192 break;
193 case 1:
194 iLayer = AliGeomManager::kTRD2;
195 break;
196 case 2:
197 iLayer = AliGeomManager::kTRD3;
198 break;
199 case 3:
200 iLayer = AliGeomManager::kTRD4;
201 break;
202 case 4:
203 iLayer = AliGeomManager::kTRD5;
204 break;
205 case 5:
206 iLayer = AliGeomManager::kTRD6;
207 break;
208 };
053767a4 209 Int_t modId = fGeom->GetSector(idet) * fGeom->Nstack() + fGeom->GetStack(idet);
41702fec 210 UShort_t volid = AliGeomManager::LayerToVolUID(iLayer, modId);
211 p.SetVolumeID(volid);
212
213 return kTRUE;
0906e73e 214}
215
eb38ed55 216//____________________________________________________________________
217TLinearFitter* AliTRDtrackerV1::GetTiltedRiemanFitter()
218{
41702fec 219 if(!fgTiltedRieman) fgTiltedRieman = new TLinearFitter(4, "hyp4");
220 return fgTiltedRieman;
eb38ed55 221}
0906e73e 222
eb38ed55 223//____________________________________________________________________
224TLinearFitter* AliTRDtrackerV1::GetTiltedRiemanFitterConstraint()
225{
41702fec 226 if(!fgTiltedRiemanConstrained) fgTiltedRiemanConstrained = new TLinearFitter(2, "hyp2");
227 return fgTiltedRiemanConstrained;
eb38ed55 228}
41702fec 229
eb38ed55 230//____________________________________________________________________
231AliRieman* AliTRDtrackerV1::GetRiemanFitter()
232{
053767a4 233 if(!fgRieman) fgRieman = new AliRieman(AliTRDtrackingChamber::kNTimeBins * AliTRDgeometry::kNlayer);
41702fec 234 return fgRieman;
eb38ed55 235}
41702fec 236
0906e73e 237//_____________________________________________________________________________
238Int_t AliTRDtrackerV1::PropagateBack(AliESDEvent *event)
239{
41702fec 240 //
241 // Gets seeds from ESD event. The seeds are AliTPCtrack's found and
242 // backpropagated by the TPC tracker. Each seed is first propagated
243 // to the TRD, and then its prolongation is searched in the TRD.
244 // If sufficiently long continuation of the track is found in the TRD
245 // the track is updated, otherwise it's stored as originaly defined
246 // by the TPC tracker.
247 //
248
249 // Calibration monitor
250 AliTRDCalibraFillHisto *calibra = AliTRDCalibraFillHisto::Instance();
251 if (!calibra) AliInfo("Could not get Calibra instance\n");
252
253 Int_t found = 0; // number of tracks found
254 Float_t foundMin = 20.0;
255
d611c74f 256 Float_t *quality = 0x0;
257 Int_t *index = 0x0;
41702fec 258 Int_t nSeed = event->GetNumberOfTracks();
d611c74f 259 if(nSeed){
260 quality = new Float_t[nSeed];
261 index = new Int_t[nSeed];
262 for (Int_t iSeed = 0; iSeed < nSeed; iSeed++) {
263 AliESDtrack *seed = event->GetTrack(iSeed);
264 Double_t covariance[15];
265 seed->GetExternalCovariance(covariance);
266 quality[iSeed] = covariance[0] + covariance[2];
267 }
268 // Sort tracks according to covariance of local Y and Z
269 TMath::Sort(nSeed,quality,index,kFALSE);
41702fec 270 }
41702fec 271
272 // Backpropagate all seeds
273 Int_t expectedClr;
274 AliTRDtrackV1 track;
275 for (Int_t iSeed = 0; iSeed < nSeed; iSeed++) {
276
277 // Get the seeds in sorted sequence
278 AliESDtrack *seed = event->GetTrack(index[iSeed]);
279
280 // Check the seed status
281 ULong_t status = seed->GetStatus();
282 if ((status & AliESDtrack::kTPCout) == 0) continue;
283 if ((status & AliESDtrack::kTRDout) != 0) continue;
284
285 // Do the back prolongation
286 new(&track) AliTRDtrackV1(*seed);
215f7116 287 track.SetReconstructor(fReconstructor);
288
41702fec 289 //Int_t lbl = seed->GetLabel();
290 //track.SetSeedLabel(lbl);
e4d4864b 291
292 // Make backup and mark entrance in the TRD
76b60503 293 seed->UpdateTrackParams(&track, AliESDtrack::kTRDin);
294 seed->UpdateTrackParams(&track, AliESDtrack::kTRDbackup);
41702fec 295 Float_t p4 = track.GetC();
ae3fbe1f 296 expectedClr = FollowBackProlongation(track);
297
298 if (expectedClr<0) continue; // Back prolongation failed
299
300 if(expectedClr){
d611c74f 301 found++;
41702fec 302 // computes PID for track
303 track.CookPID();
304 // update calibration references using this track
305 if(calibra->GetHisto2d()) calibra->UpdateHistogramsV1(&track);
306 // save calibration object
224f357f 307 if (fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 0 /*&& quality TODO*/){
308 AliTRDtrackV1 *calibTrack = new AliTRDtrackV1(track);
309 calibTrack->SetOwner();
310 seed->AddCalibObject(calibTrack);
311 }
312 //update ESD track
41702fec 313 if ((track.GetNumberOfClusters() > 15) && (track.GetNumberOfClusters() > 0.5*expectedClr)) {
2389e96f 314 seed->UpdateTrackParams(&track, AliESDtrack::kTRDout);
41702fec 315 track.UpdateESDtrack(seed);
41702fec 316 }
317 }
318
319 if ((TMath::Abs(track.GetC() - p4) / TMath::Abs(p4) < 0.2) ||(track.Pt() > 0.8)) {
320 //
321 // Make backup for back propagation
322 //
323 Int_t foundClr = track.GetNumberOfClusters();
324 if (foundClr >= foundMin) {
325 //AliInfo(Form("Making backup track ncls [%d]...", foundClr));
326 //track.CookdEdx();
327 //track.CookdEdxTimBin(seed->GetID());
328 track.CookLabel(1. - fgkLabelFraction);
329 if(track.GetBackupTrack()) UseClusters(track.GetBackupTrack());
41702fec 330
331 // Sign only gold tracks
332 if (track.GetChi2() / track.GetNumberOfClusters() < 4) {
76b60503 333 if ((seed->GetKinkIndex(0) == 0) && (track.Pt() < 1.5)){
334 //UseClusters(&track);
335 }
41702fec 336 }
337 Bool_t isGold = kFALSE;
338
339 // Full gold track
340 if (track.GetChi2() / track.GetNumberOfClusters() < 5) {
341 if (track.GetBackupTrack()) seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup);
342
343 isGold = kTRUE;
344 }
345
346 // Almost gold track
347 if ((!isGold) && (track.GetNCross() == 0) && (track.GetChi2() / track.GetNumberOfClusters() < 7)) {
348 //seed->UpdateTrackParams(track, AliESDtrack::kTRDbackup);
349 if (track.GetBackupTrack()) seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup);
350
351 isGold = kTRUE;
352 }
353
354 if ((!isGold) && (track.GetBackupTrack())) {
355 if ((track.GetBackupTrack()->GetNumberOfClusters() > foundMin) && ((track.GetBackupTrack()->GetChi2()/(track.GetBackupTrack()->GetNumberOfClusters()+1)) < 7)) {
356 seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup);
357 isGold = kTRUE;
358 }
359 }
360
361 //if ((track->StatusForTOF() > 0) && (track->GetNCross() == 0) && (Float_t(track->GetNumberOfClusters()) / Float_t(track->GetNExpected()) > 0.4)) {
362 //seed->UpdateTrackParams(track->GetBackupTrack(), AliESDtrack::kTRDbackup);
363 //}
364 }
365 }
366
367 // Propagation to the TOF (I.Belikov)
368 if (track.IsStopped() == kFALSE) {
369 Double_t xtof = 371.0;
370 Double_t xTOF0 = 370.0;
371
372 Double_t c2 = track.GetSnp() + track.GetC() * (xtof - track.GetX());
373 if (TMath::Abs(c2) >= 0.99) continue;
374
ae3fbe1f 375 if (!PropagateToX(track, xTOF0, fgkMaxStep)) continue;
41702fec 376
377 // Energy losses taken to the account - check one more time
378 c2 = track.GetSnp() + track.GetC() * (xtof - track.GetX());
379 if (TMath::Abs(c2) >= 0.99) continue;
380
381 //if (!PropagateToX(*track,xTOF0,fgkMaxStep)) {
382 // fHBackfit->Fill(7);
383 //delete track;
384 // continue;
385 //}
386
387 Double_t ymax = xtof * TMath::Tan(0.5 * AliTRDgeometry::GetAlpha());
388 Double_t y;
389 track.GetYAt(xtof,GetBz(),y);
390 if (y > ymax) {
391 if (!track.Rotate( AliTRDgeometry::GetAlpha())) continue;
392 }else if (y < -ymax) {
393 if (!track.Rotate(-AliTRDgeometry::GetAlpha())) continue;
394 }
395
396 if (track.PropagateTo(xtof)) {
397 seed->UpdateTrackParams(&track, AliESDtrack::kTRDout);
398 track.UpdateESDtrack(seed);
41702fec 399 }
400 } else {
401 if ((track.GetNumberOfClusters() > 15) && (track.GetNumberOfClusters() > 0.5*expectedClr)) {
402 seed->UpdateTrackParams(&track, AliESDtrack::kTRDout);
403
404 track.UpdateESDtrack(seed);
41702fec 405 }
406 }
407
408 seed->SetTRDQuality(track.StatusForTOF());
409 seed->SetTRDBudget(track.GetBudget(0));
410 }
d611c74f 411 if(index) delete [] index;
412 if(quality) delete [] quality;
41702fec 413
414
415 AliInfo(Form("Number of seeds: %d", nSeed));
416 AliInfo(Form("Number of back propagated TRD tracks: %d", found));
417
d611c74f 418 // run stand alone tracking
3a039a31 419 if (fReconstructor->IsSeeding()) Clusters2Tracks(event);
41702fec 420
421 return 0;
0906e73e 422}
423
424
425//____________________________________________________________________
426Int_t AliTRDtrackerV1::RefitInward(AliESDEvent *event)
427{
41702fec 428 //
429 // Refits tracks within the TRD. The ESD event is expected to contain seeds
430 // at the outer part of the TRD.
431 // The tracks are propagated to the innermost time bin
432 // of the TRD and the ESD event is updated
433 // Origin: Thomas KUHR (Thomas.Kuhr@cern.ch)
434 //
435
436 Int_t nseed = 0; // contor for loaded seeds
437 Int_t found = 0; // contor for updated TRD tracks
438
439
440 AliTRDtrackV1 track;
441 for (Int_t itrack = 0; itrack < event->GetNumberOfTracks(); itrack++) {
442 AliESDtrack *seed = event->GetTrack(itrack);
443 new(&track) AliTRDtrackV1(*seed);
444
445 if (track.GetX() < 270.0) {
446 seed->UpdateTrackParams(&track, AliESDtrack::kTRDbackup);
447 continue;
448 }
449
450 ULong_t status = seed->GetStatus();
e4d4864b 451 // reject tracks which failed propagation in the TRD
41702fec 452 if((status & AliESDtrack::kTRDout) == 0) continue;
e4d4864b 453
454 // reject tracks which are produced by the TRD stand alone track finder.
455 if((status & AliESDtrack::kTRDin) == 0) continue;
41702fec 456 nseed++;
457
458 track.ResetCovariance(50.0);
459
460 // do the propagation and processing
461 Bool_t kUPDATE = kFALSE;
462 Double_t xTPC = 250.0;
463 if(FollowProlongation(track)){
464 // Prolongate to TPC
465 if (PropagateToX(track, xTPC, fgkMaxStep)) { // -with update
466 seed->UpdateTrackParams(&track, AliESDtrack::kTRDrefit);
467 found++;
468 kUPDATE = kTRUE;
469 }
470 }
471
472 // Prolongate to TPC without update
473 if(!kUPDATE) {
474 AliTRDtrackV1 tt(*seed);
475 if (PropagateToX(tt, xTPC, fgkMaxStep)) seed->UpdateTrackParams(&tt, AliESDtrack::kTRDrefit);
476 }
477 }
478 AliInfo(Form("Number of loaded seeds: %d",nseed));
479 AliInfo(Form("Number of found tracks from loaded seeds: %d",found));
480
481 return 0;
0906e73e 482}
483
0906e73e 484//____________________________________________________________________
485Int_t AliTRDtrackerV1::FollowProlongation(AliTRDtrackV1 &t)
486{
41702fec 487 // Extrapolates the TRD track in the TPC direction.
488 //
489 // Parameters
490 // t : the TRD track which has to be extrapolated
491 //
492 // Output
493 // number of clusters attached to the track
494 //
495 // Detailed description
496 //
497 // Starting from current radial position of track <t> this function
498 // extrapolates the track through the 6 TRD layers. The following steps
499 // are being performed for each plane:
500 // 1. prepare track:
501 // a. get plane limits in the local x direction
502 // b. check crossing sectors
503 // c. check track inclination
504 // 2. search tracklet in the tracker list (see GetTracklet() for details)
505 // 3. evaluate material budget using the geo manager
506 // 4. propagate and update track using the tracklet information.
507 //
508 // Debug level 2
509 //
510
511 Int_t nClustersExpected = 0;
512 Int_t lastplane = 5; //GetLastPlane(&t);
513 for (Int_t iplane = lastplane; iplane >= 0; iplane--) {
514 Int_t index = 0;
515 AliTRDseedV1 *tracklet = GetTracklet(&t, iplane, index);
516 if(!tracklet) continue;
517 if(!tracklet->IsOK()) AliWarning("tracklet not OK");
518
519 Double_t x = tracklet->GetX0();
520 // reject tracklets which are not considered for inward refit
521 if(x > t.GetX()+fgkMaxStep) continue;
522
523 // append tracklet to track
524 t.SetTracklet(tracklet, index);
525
526 if (x < (t.GetX()-fgkMaxStep) && !PropagateToX(t, x+fgkMaxStep, fgkMaxStep)) break;
527 if (!AdjustSector(&t)) break;
528
529 // Start global position
530 Double_t xyz0[3];
531 t.GetXYZ(xyz0);
532
533 // End global position
534 Double_t alpha = t.GetAlpha(), y, z;
535 if (!t.GetProlongation(x,y,z)) break;
536 Double_t xyz1[3];
537 xyz1[0] = x * TMath::Cos(alpha) - y * TMath::Sin(alpha);
538 xyz1[1] = x * TMath::Sin(alpha) + y * TMath::Cos(alpha);
539 xyz1[2] = z;
540
51a23065 541 Double_t length = TMath::Sqrt(
542 (xyz0[0]-xyz1[0])*(xyz0[0]-xyz1[0]) +
543 (xyz0[1]-xyz1[1])*(xyz0[1]-xyz1[1]) +
544 (xyz0[2]-xyz1[2])*(xyz0[2]-xyz1[2])
545 );
546 if(length>0.){
547 // Get material budget
548 Double_t param[7];
549 if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param)<=0.) break;
550 Double_t xrho= param[0]*param[4];
551 Double_t xx0 = param[1]; // Get mean propagation parameters
552
553 // Propagate and update
554 t.PropagateTo(x, xx0, xrho);
555 if (!AdjustSector(&t)) break;
556 }
41702fec 557
558 Double_t maxChi2 = t.GetPredictedChi2(tracklet);
559 if (maxChi2 < 1e+10 && t.Update(tracklet, maxChi2)){
560 nClustersExpected += tracklet->GetN();
561 }
562 }
563
3a039a31 564 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){
41702fec 565 Int_t index;
51a23065 566 for(int iplane=0; iplane<AliTRDgeometry::kNlayer; iplane++){
41702fec 567 AliTRDseedV1 *tracklet = GetTracklet(&t, iplane, index);
568 if(!tracklet) continue;
569 t.SetTracklet(tracklet, index);
570 }
571
572 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
573 TTreeSRedirector &cstreamer = *fgDebugStreamer;
574 cstreamer << "FollowProlongation"
575 << "EventNumber=" << eventNumber
576 << "ncl=" << nClustersExpected
577 //<< "track.=" << &t
578 << "\n";
579 }
580
581 return nClustersExpected;
0906e73e 582
583}
584
585//_____________________________________________________________________________
586Int_t AliTRDtrackerV1::FollowBackProlongation(AliTRDtrackV1 &t)
587{
41702fec 588 // Extrapolates the TRD track in the TOF direction.
589 //
590 // Parameters
591 // t : the TRD track which has to be extrapolated
592 //
593 // Output
594 // number of clusters attached to the track
595 //
596 // Detailed description
597 //
598 // Starting from current radial position of track <t> this function
599 // extrapolates the track through the 6 TRD layers. The following steps
600 // are being performed for each plane:
601 // 1. prepare track:
602 // a. get plane limits in the local x direction
603 // b. check crossing sectors
604 // c. check track inclination
605 // 2. build tracklet (see AliTRDseed::AttachClusters() for details)
606 // 3. evaluate material budget using the geo manager
607 // 4. propagate and update track using the tracklet information.
608 //
609 // Debug level 2
610 //
611
612 Int_t nClustersExpected = 0;
613 Double_t clength = AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick();
614 AliTRDtrackingChamber *chamber = 0x0;
615
3b57a3f7 616 AliTRDseedV1 tracklet, *ptrTracklet = 0x0;
181d2c97 617 // in case of stand alone tracking we store all the pointers to the tracklets in a temporary array
618 AliTRDseedV1 *tracklets[kNPlanes];
619 memset(tracklets, 0, sizeof(AliTRDseedV1 *) * kNPlanes);
620 for(Int_t ip = 0; ip < kNPlanes; ip++){
621 tracklets[ip] = t.GetTracklet(ip);
622 t.UnsetTracklet(ip);
623 }
3b57a3f7 624
053767a4 625 // Loop through the TRD layers
626 for (Int_t ilayer = 0; ilayer < AliTRDgeometry::Nlayer(); ilayer++) {
41702fec 627 // BUILD TRACKLET IF NOT ALREADY BUILT
628 Double_t x = 0., y, z, alpha;
181d2c97 629 ptrTracklet = tracklets[ilayer];
41702fec 630 if(!ptrTracklet){
053767a4 631 ptrTracklet = new(&tracklet) AliTRDseedV1(ilayer);
43d6ad34 632 ptrTracklet->SetReconstructor(fReconstructor);
41702fec 633 alpha = t.GetAlpha();
053767a4 634 Int_t sector = Int_t(alpha/AliTRDgeometry::GetAlpha() + (alpha>0. ? 0 : AliTRDgeometry::kNsector));
41702fec 635
636 if(!fTrSec[sector].GetNChambers()) continue;
637
053767a4 638 if((x = fTrSec[sector].GetX(ilayer)) < 1.) continue;
41702fec 639
35c24814 640 if (!t.GetProlongation(x, y, z)) return -1/*nClustersExpected*/;
053767a4 641 Int_t stack = fGeom->GetStack(z, ilayer);
41702fec 642 Int_t nCandidates = stack >= 0 ? 1 : 2;
643 z -= stack >= 0 ? 0. : 4.;
644
645 for(int icham=0; icham<nCandidates; icham++, z+=8){
053767a4 646 if((stack = fGeom->GetStack(z, ilayer)) < 0) continue;
41702fec 647
053767a4 648 if(!(chamber = fTrSec[sector].GetChamber(stack, ilayer))) continue;
41702fec 649
3a039a31 650 if(chamber->GetNClusters() < fgNTimeBins*fReconstructor->GetRecoParam() ->GetFindableClusters()) continue;
41702fec 651
652 x = chamber->GetX();
653
053767a4 654 AliTRDpadPlane *pp = fGeom->GetPadPlane(ilayer, stack);
aec26713 655 tracklet.SetTilt(TMath::Tan(TMath::DegToRad()*pp->GetTiltingAngle()));
41702fec 656 tracklet.SetPadLength(pp->GetLengthIPad());
ae4e8b84 657 tracklet.SetDetector(chamber->GetDetector());
41702fec 658 tracklet.SetX0(x);
659 if(!tracklet.Init(&t)){
660 t.SetStopped(kTRUE);
661 return nClustersExpected;
662 }
35c24814 663 if(!tracklet.AttachClustersIter(chamber, 1000./*, kTRUE*/)) continue;
41702fec 664 tracklet.Init(&t);
665
3a039a31 666 if(tracklet.GetN() < fgNTimeBins*fReconstructor->GetRecoParam() ->GetFindableClusters()) continue;
41702fec 667
668 break;
669 }
76b60503 670 //ptrTracklet->UseClusters();
41702fec 671 }
672 if(!ptrTracklet->IsOK()){
673 if(x < 1.) continue; //temporary
35c24814 674 if(!PropagateToX(t, x-fgkMaxStep, fgkMaxStep)) return -1/*nClustersExpected*/;
675 if(!AdjustSector(&t)) return -1/*nClustersExpected*/;
676 if(TMath::Abs(t.GetSnp()) > fgkMaxSnp) return -1/*nClustersExpected*/;
41702fec 677 continue;
678 }
679
680 // Propagate closer to the current chamber if neccessary
681 x -= clength;
35c24814 682 if (x > (fgkMaxStep + t.GetX()) && !PropagateToX(t, x-fgkMaxStep, fgkMaxStep)) return -1/*nClustersExpected*/;
683 if (!AdjustSector(&t)) return -1/*nClustersExpected*/;
684 if (TMath::Abs(t.GetSnp()) > fgkMaxSnp) return -1/*nClustersExpected*/;
41702fec 685
686 // load tracklet to the tracker and the track
687 ptrTracklet = SetTracklet(ptrTracklet);
688 t.SetTracklet(ptrTracklet, fTracklets->GetEntriesFast()-1);
689
690
691 // Calculate the mean material budget along the path inside the chamber
692 //Calculate global entry and exit positions of the track in chamber (only track prolongation)
693 Double_t xyz0[3]; // entry point
694 t.GetXYZ(xyz0);
695 alpha = t.GetAlpha();
696 x = ptrTracklet->GetX0();
35c24814 697 if (!t.GetProlongation(x, y, z)) return -1/*nClustersExpected*/;
41702fec 698 Double_t xyz1[3]; // exit point
699 xyz1[0] = x * TMath::Cos(alpha) - y * TMath::Sin(alpha);
700 xyz1[1] = +x * TMath::Sin(alpha) + y * TMath::Cos(alpha);
701 xyz1[2] = z;
702 Double_t param[7];
83dea92e 703 if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param)<=0.) return -1;
41702fec 704 // The mean propagation parameters
705 Double_t xrho = param[0]*param[4]; // density*length
706 Double_t xx0 = param[1]; // radiation length
707
708 // Propagate and update track
35c24814 709 if (!t.PropagateTo(x, xx0, xrho)) return -1/*nClustersExpected*/;
710 if (!AdjustSector(&t)) return -1/*nClustersExpected*/;
41702fec 711 Double_t maxChi2 = t.GetPredictedChi2(ptrTracklet);
35c24814 712 if (!t.Update(ptrTracklet, maxChi2)) return -1/*nClustersExpected*/;
ae3fbe1f 713 if (maxChi2<1e+10) {
41702fec 714 nClustersExpected += ptrTracklet->GetN();
715 //t.SetTracklet(&tracklet, index);
716 }
717 // Reset material budget if 2 consecutive gold
053767a4 718 if(ilayer>0 && t.GetTracklet(ilayer-1) && ptrTracklet->GetN() + t.GetTracklet(ilayer-1)->GetN() > 20) t.SetBudget(2, 0.);
41702fec 719
720 // Make backup of the track until is gold
721 // TO DO update quality check of the track.
722 // consider comparison with fTimeBinsRange
723 Float_t ratio0 = ptrTracklet->GetN() / Float_t(fgNTimeBins);
724 //Float_t ratio1 = Float_t(t.GetNumberOfClusters()+1) / Float_t(t.GetNExpected()+1);
725 //printf("tracklet.GetChi2() %f [< 18.0]\n", tracklet.GetChi2());
726 //printf("ratio0 %f [> 0.8]\n", ratio0);
727 //printf("ratio1 %f [> 0.6]\n", ratio1);
728 //printf("ratio0+ratio1 %f [> 1.5]\n", ratio0+ratio1);
729 //printf("t.GetNCross() %d [== 0]\n", t.GetNCross());
730 //printf("TMath::Abs(t.GetSnp()) %f [< 0.85]\n", TMath::Abs(t.GetSnp()));
731 //printf("t.GetNumberOfClusters() %d [> 20]\n", t.GetNumberOfClusters());
732
733 if (//(tracklet.GetChi2() < 18.0) && TO DO check with FindClusters and move it to AliTRDseed::Update
734 (ratio0 > 0.8) &&
735 //(ratio1 > 0.6) &&
736 //(ratio0+ratio1 > 1.5) &&
737 (t.GetNCross() == 0) &&
738 (TMath::Abs(t.GetSnp()) < 0.85) &&
739 (t.GetNumberOfClusters() > 20)) t.MakeBackupTrack();
740
053767a4 741 } // end layers loop
41702fec 742
3a039a31 743 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){
41702fec 744 TTreeSRedirector &cstreamer = *fgDebugStreamer;
745 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
746 //AliTRDtrackV1 *debugTrack = new AliTRDtrackV1(t);
747 //debugTrack->SetOwner();
748 cstreamer << "FollowBackProlongation"
749 << "EventNumber=" << eventNumber
750 << "ncl=" << nClustersExpected
751 //<< "track.=" << debugTrack
752 << "\n";
753 }
754
755 return nClustersExpected;
0906e73e 756}
757
eb38ed55 758//_________________________________________________________________________
759Float_t AliTRDtrackerV1::FitRieman(AliTRDseedV1 *tracklets, Double_t *chi2, Int_t *planes){
41702fec 760 //
761 // Fits a Riemann-circle to the given points without tilting pad correction.
762 // The fit is performed using an instance of the class AliRieman (equations
763 // and transformations see documentation of this class)
764 // Afterwards all the tracklets are Updated
765 //
766 // Parameters: - Array of tracklets (AliTRDseedV1)
767 // - Storage for the chi2 values (beginning with direction z)
768 // - Seeding configuration
769 // Output: - The curvature
770 //
771 AliRieman *fitter = AliTRDtrackerV1::GetRiemanFitter();
772 fitter->Reset();
773 Int_t allplanes[] = {0, 1, 2, 3, 4, 5};
774 Int_t *ppl = &allplanes[0];
775 Int_t maxLayers = 6;
776 if(planes){
777 maxLayers = 4;
778 ppl = planes;
779 }
780 for(Int_t il = 0; il < maxLayers; il++){
781 if(!tracklets[ppl[il]].IsOK()) continue;
782 fitter->AddPoint(tracklets[ppl[il]].GetX0(), tracklets[ppl[il]].GetYfitR(0), tracklets[ppl[il]].GetZProb(),1,10);
783 }
784 fitter->Update();
785 // Set the reference position of the fit and calculate the chi2 values
786 memset(chi2, 0, sizeof(Double_t) * 2);
787 for(Int_t il = 0; il < maxLayers; il++){
788 // Reference positions
789 tracklets[ppl[il]].Init(fitter);
790
791 // chi2
792 if((!tracklets[ppl[il]].IsOK()) && (!planes)) continue;
793 chi2[0] += tracklets[ppl[il]].GetChi2Y();
794 chi2[1] += tracklets[ppl[il]].GetChi2Z();
795 }
796 return fitter->GetC();
eb38ed55 797}
798
799//_________________________________________________________________________
800void AliTRDtrackerV1::FitRieman(AliTRDcluster **seedcl, Double_t chi2[2])
801{
41702fec 802 //
803 // Performs a Riemann helix fit using the seedclusters as spacepoints
804 // Afterwards the chi2 values are calculated and the seeds are updated
805 //
806 // Parameters: - The four seedclusters
807 // - The tracklet array (AliTRDseedV1)
808 // - The seeding configuration
809 // - Chi2 array
810 //
811 // debug level 2
812 //
813 AliRieman *fitter = AliTRDtrackerV1::GetRiemanFitter();
814 fitter->Reset();
815 for(Int_t i = 0; i < 4; i++)
816 fitter->AddPoint(seedcl[i]->GetX(), seedcl[i]->GetY(), seedcl[i]->GetZ(), 1, 10);
817 fitter->Update();
818
819
820 // Update the seed and calculated the chi2 value
821 chi2[0] = 0; chi2[1] = 0;
822 for(Int_t ipl = 0; ipl < kNSeedPlanes; ipl++){
823 // chi2
824 chi2[0] += (seedcl[ipl]->GetZ() - fitter->GetZat(seedcl[ipl]->GetX())) * (seedcl[ipl]->GetZ() - fitter->GetZat(seedcl[ipl]->GetX()));
825 chi2[1] += (seedcl[ipl]->GetY() - fitter->GetYat(seedcl[ipl]->GetX())) * (seedcl[ipl]->GetY() - fitter->GetYat(seedcl[ipl]->GetX()));
826 }
eb38ed55 827}
828
829
830//_________________________________________________________________________
831Float_t AliTRDtrackerV1::FitTiltedRiemanConstraint(AliTRDseedV1 *tracklets, Double_t zVertex)
832{
41702fec 833 //
834 // Fits a helix to the clusters. Pad tilting is considered. As constraint it is
835 // assumed that the vertex position is set to 0.
836 // This method is very usefull for high-pt particles
837 // Basis for the fit: (x - x0)^2 + (y - y0)^2 - R^2 = 0
838 // x0, y0: Center of the circle
839 // Measured y-position: ymeas = y - tan(phiT)(zc - zt)
840 // zc: center of the pad row
841 // Equation which has to be fitted (after transformation):
842 // a + b * u + e * v + 2*(ymeas + tan(phiT)(z - zVertex))*t = 0
843 // Transformation:
844 // t = 1/(x^2 + y^2)
845 // u = 2 * x * t
846 // v = 2 * x * tan(phiT) * t
847 // Parameters in the equation:
848 // a = -1/y0, b = x0/y0, e = dz/dx
849 //
850 // The Curvature is calculated by the following equation:
851 // - curv = a/Sqrt(b^2 + 1) = 1/R
852 // Parameters: - the 6 tracklets
853 // - the Vertex constraint
854 // Output: - the Chi2 value of the track
855 //
856 // debug level 5
857 //
858
859 TLinearFitter *fitter = GetTiltedRiemanFitterConstraint();
860 fitter->StoreData(kTRUE);
861 fitter->ClearPoints();
862 AliTRDcluster *cl = 0x0;
863
864 Float_t x, y, z, w, t, error, tilt;
865 Double_t uvt[2];
866 Int_t nPoints = 0;
053767a4 867 for(Int_t ilr = 0; ilr < AliTRDgeometry::kNlayer; ilr++){
868 if(!tracklets[ilr].IsOK()) continue;
41702fec 869 for(Int_t itb = 0; itb < fgNTimeBins; itb++){
053767a4 870 if(!tracklets[ilr].IsUsable(itb)) continue;
871 cl = tracklets[ilr].GetClusters(itb);
41702fec 872 x = cl->GetX();
873 y = cl->GetY();
874 z = cl->GetZ();
053767a4 875 tilt = tracklets[ilr].GetTilt();
41702fec 876 // Transformation
877 t = 1./(x * x + y * y);
878 uvt[0] = 2. * x * t;
879 uvt[1] = 2. * x * t * tilt ;
880 w = 2. * (y + tilt * (z - zVertex)) * t;
881 error = 2. * 0.2 * t;
882 fitter->AddPoint(uvt, w, error);
883 nPoints++;
884 }
885 }
886 fitter->Eval();
887
888 // Calculate curvature
889 Double_t a = fitter->GetParameter(0);
890 Double_t b = fitter->GetParameter(1);
891 Double_t curvature = a/TMath::Sqrt(b*b + 1);
892
893 Float_t chi2track = fitter->GetChisquare()/Double_t(nPoints);
894 for(Int_t ip = 0; ip < AliTRDtrackerV1::kNPlanes; ip++)
895 tracklets[ip].SetCC(curvature);
896
3a039a31 897/* if(fReconstructor->GetStreamLevel() >= 5){
41702fec 898 //Linear Model on z-direction
899 Double_t xref = CalculateReferenceX(tracklets); // Relative to the middle of the stack
900 Double_t slope = fitter->GetParameter(2);
901 Double_t zref = slope * xref;
902 Float_t chi2Z = CalculateChi2Z(tracklets, zref, slope, xref);
903 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
904 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
905 TTreeSRedirector &treeStreamer = *fgDebugStreamer;
906 treeStreamer << "FitTiltedRiemanConstraint"
907 << "EventNumber=" << eventNumber
908 << "CandidateNumber=" << candidateNumber
909 << "Curvature=" << curvature
910 << "Chi2Track=" << chi2track
911 << "Chi2Z=" << chi2Z
912 << "zref=" << zref
913 << "\n";
3a039a31 914 }*/
41702fec 915 return chi2track;
eb38ed55 916}
917
918//_________________________________________________________________________
919Float_t AliTRDtrackerV1::FitTiltedRieman(AliTRDseedV1 *tracklets, Bool_t sigError)
920{
41702fec 921 //
922 // Performs a Riemann fit taking tilting pad correction into account
923 // The equation of a Riemann circle, where the y position is substituted by the
924 // measured y-position taking pad tilting into account, has to be transformed
925 // into a 4-dimensional hyperplane equation
926 // Riemann circle: (x-x0)^2 + (y-y0)^2 -R^2 = 0
927 // Measured y-Position: ymeas = y - tan(phiT)(zc - zt)
928 // zc: center of the pad row
929 // zt: z-position of the track
930 // The z-position of the track is assumed to be linear dependent on the x-position
931 // Transformed equation: a + b * u + c * t + d * v + e * w - 2 * (ymeas + tan(phiT) * zc) * t = 0
932 // Transformation: u = 2 * x * t
933 // v = 2 * tan(phiT) * t
934 // w = 2 * tan(phiT) * (x - xref) * t
935 // t = 1 / (x^2 + ymeas^2)
936 // Parameters: a = -1/y0
937 // b = x0/y0
938 // c = (R^2 -x0^2 - y0^2)/y0
939 // d = offset
940 // e = dz/dx
941 // If the offset respectively the slope in z-position is impossible, the parameters are fixed using
942 // results from the simple riemann fit. Afterwards the fit is redone.
943 // The curvature is calculated according to the formula:
944 // curv = a/(1 + b^2 + c*a) = 1/R
945 //
946 // Paramters: - Array of tracklets (connected to the track candidate)
947 // - Flag selecting the error definition
948 // Output: - Chi2 values of the track (in Parameter list)
949 //
950 TLinearFitter *fitter = GetTiltedRiemanFitter();
951 fitter->StoreData(kTRUE);
952 fitter->ClearPoints();
953 AliTRDLeastSquare zfitter;
954 AliTRDcluster *cl = 0x0;
955
956 Double_t xref = CalculateReferenceX(tracklets);
957 Double_t x, y, z, t, tilt, dx, w, we;
958 Double_t uvt[4];
959 Int_t nPoints = 0;
960 // Containers for Least-square fitter
961 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
962 if(!tracklets[ipl].IsOK()) continue;
963 for(Int_t itb = 0; itb < fgNTimeBins; itb++){
964 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
965 if (!tracklets[ipl].IsUsable(itb)) continue;
966 x = cl->GetX();
967 y = cl->GetY();
968 z = cl->GetZ();
969 tilt = tracklets[ipl].GetTilt();
970 dx = x - xref;
971 // Transformation
972 t = 1./(x*x + y*y);
973 uvt[0] = 2. * x * t;
974 uvt[1] = t;
975 uvt[2] = 2. * tilt * t;
976 uvt[3] = 2. * tilt * dx * t;
977 w = 2. * (y + tilt*z) * t;
978 // error definition changes for the different calls
979 we = 2. * t;
980 we *= sigError ? tracklets[ipl].GetSigmaY() : 0.2;
981 fitter->AddPoint(uvt, w, we);
982 zfitter.AddPoint(&x, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
983 nPoints++;
984 }
985 }
986 fitter->Eval();
987 zfitter.Eval();
988
989 Double_t offset = fitter->GetParameter(3);
990 Double_t slope = fitter->GetParameter(4);
991
992 // Linear fitter - not possible to make boundaries
993 // Do not accept non possible z and dzdx combinations
994 Bool_t acceptablez = kTRUE;
995 Double_t zref = 0.0;
996 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
997 if(!tracklets[iLayer].IsOK()) continue;
998 zref = offset + slope * (tracklets[iLayer].GetX0() - xref);
999 if (TMath::Abs(tracklets[iLayer].GetZProb() - zref) > tracklets[iLayer].GetPadLength() * 0.5 + 1.0)
1000 acceptablez = kFALSE;
1001 }
1002 if (!acceptablez) {
1003 Double_t dzmf = zfitter.GetFunctionParameter(1);
1004 Double_t zmf = zfitter.GetFunctionValue(&xref);
1005 fgTiltedRieman->FixParameter(3, zmf);
1006 fgTiltedRieman->FixParameter(4, dzmf);
1007 fitter->Eval();
1008 fitter->ReleaseParameter(3);
1009 fitter->ReleaseParameter(4);
1010 offset = fitter->GetParameter(3);
1011 slope = fitter->GetParameter(4);
1012 }
1013
1014 // Calculate Curvarture
1015 Double_t a = fitter->GetParameter(0);
1016 Double_t b = fitter->GetParameter(1);
1017 Double_t c = fitter->GetParameter(2);
1018 Double_t curvature = 1.0 + b*b - c*a;
1019 if (curvature > 0.0)
1020 curvature = a / TMath::Sqrt(curvature);
1021
1022 Double_t chi2track = fitter->GetChisquare()/Double_t(nPoints);
1023
1024 // Update the tracklets
1025 Double_t dy, dz;
1026 for(Int_t iLayer = 0; iLayer < AliTRDtrackerV1::kNPlanes; iLayer++) {
1027
1028 x = tracklets[iLayer].GetX0();
1029 y = 0;
1030 z = 0;
1031 dy = 0;
1032 dz = 0;
1033
1034 // y: R^2 = (x - x0)^2 + (y - y0)^2
1035 // => y = y0 +/- Sqrt(R^2 - (x - x0)^2)
1036 // R = Sqrt() = 1/Curvature
1037 // => y = y0 +/- Sqrt(1/Curvature^2 - (x - x0)^2)
1038 Double_t res = (x * a + b); // = (x - x0)/y0
1039 res *= res;
1040 res = 1.0 - c * a + b * b - res; // = (R^2 - (x - x0)^2)/y0^2
1041 if (res >= 0) {
1042 res = TMath::Sqrt(res);
1043 y = (1.0 - res) / a;
1044 }
1045
1046 // dy: R^2 = (x - x0)^2 + (y - y0)^2
1047 // => y = +/- Sqrt(R^2 - (x - x0)^2) + y0
1048 // => dy/dx = (x - x0)/Sqrt(R^2 - (x - x0)^2)
1049 // Curvature: cr = 1/R = a/Sqrt(1 + b^2 - c*a)
1050 // => dy/dx = (x - x0)/(1/(cr^2) - (x - x0)^2)
1051 Double_t x0 = -b / a;
1052 if (-c * a + b * b + 1 > 0) {
1053 if (1.0/(curvature * curvature) - (x - x0) * (x - x0) > 0.0) {
1054 Double_t yderiv = (x - x0) / TMath::Sqrt(1.0/(curvature * curvature) - (x - x0) * (x - x0));
1055 if (a < 0) yderiv *= -1.0;
1056 dy = yderiv;
1057 }
1058 }
1059 z = offset + slope * (x - xref);
1060 dz = slope;
1061 tracklets[iLayer].SetYref(0, y);
1062 tracklets[iLayer].SetYref(1, dy);
1063 tracklets[iLayer].SetZref(0, z);
1064 tracklets[iLayer].SetZref(1, dz);
1065 tracklets[iLayer].SetC(curvature);
1066 tracklets[iLayer].SetChi2(chi2track);
1067 }
1068
3a039a31 1069/* if(fReconstructor->GetStreamLevel() >=5){
41702fec 1070 TTreeSRedirector &cstreamer = *fgDebugStreamer;
1071 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
1072 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
1073 Double_t chi2z = CalculateChi2Z(tracklets, offset, slope, xref);
1074 cstreamer << "FitTiltedRieman0"
1075 << "EventNumber=" << eventNumber
1076 << "CandidateNumber=" << candidateNumber
1077 << "xref=" << xref
1078 << "Chi2Z=" << chi2z
1079 << "\n";
3a039a31 1080 }*/
41702fec 1081 return chi2track;
eb38ed55 1082}
1083
3b57a3f7 1084
9e333711 1085//____________________________________________________________________
1086Double_t AliTRDtrackerV1::FitLine(AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t err, Int_t np, AliTrackPoint *points)
1087{
1088 AliTRDLeastSquare yfitter, zfitter;
1089 AliTRDcluster *cl = 0x0;
1090
1091 AliTRDseedV1 work[kNPlanes], *tracklet = 0x0;
1092 if(!tracklets){
1093 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1094 if(!(tracklet = track->GetTracklet(ipl))) continue;
1095 if(!tracklet->IsOK()) continue;
1096 new(&work[ipl]) AliTRDseedV1(*tracklet);
1097 }
1098 tracklets = &work[0];
1099 }
1100
1101 Double_t xref = CalculateReferenceX(tracklets);
1102 Double_t x, y, z, dx, ye, yr, tilt;
1103 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1104 if(!tracklets[ipl].IsOK()) continue;
1105 for(Int_t itb = 0; itb < fgNTimeBins; itb++){
1106 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1107 if (!tracklets[ipl].IsUsable(itb)) continue;
1108 x = cl->GetX();
1109 z = cl->GetZ();
1110 dx = x - xref;
1111 zfitter.AddPoint(&dx, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
1112 }
1113 }
1114 zfitter.Eval();
1115 Double_t z0 = zfitter.GetFunctionParameter(0);
1116 Double_t dzdx = zfitter.GetFunctionParameter(1);
1117 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1118 if(!tracklets[ipl].IsOK()) continue;
1119 for(Int_t itb = 0; itb < fgNTimeBins; itb++){
1120 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1121 if (!tracklets[ipl].IsUsable(itb)) continue;
1122 x = cl->GetX();
1123 y = cl->GetY();
1124 z = cl->GetZ();
1125 tilt = tracklets[ipl].GetTilt();
1126 dx = x - xref;
1127 yr = y + tilt*(z - z0 - dzdx*dx);
1128 // error definition changes for the different calls
1129 ye = tilt*TMath::Sqrt(cl->GetSigmaZ2());
1130 ye += err ? tracklets[ipl].GetSigmaY() : 0.2;
1131 yfitter.AddPoint(&dx, yr, ye);
1132 }
1133 }
1134 yfitter.Eval();
1135 Double_t y0 = yfitter.GetFunctionParameter(0);
1136 Double_t dydx = yfitter.GetFunctionParameter(1);
1137 Double_t chi2 = 0.;//yfitter.GetChisquare()/Double_t(nPoints);
1138
1139 //update track points array
1140 if(np && points){
1141 Float_t xyz[3];
1142 for(int ip=0; ip<np; ip++){
1143 points[ip].GetXYZ(xyz);
1144 xyz[1] = y0 + dydx * (xyz[0] - xref);
1145 xyz[2] = z0 + dzdx * (xyz[0] - xref);
1146 points[ip].SetXYZ(xyz);
1147 }
1148 }
1149 return chi2;
1150}
1151
1152
3b57a3f7 1153//_________________________________________________________________________
1154Double_t AliTRDtrackerV1::FitRiemanTilt(AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t sigError, Int_t np, AliTrackPoint *points)
1155{
41702fec 1156 //
1157 // Performs a Riemann fit taking tilting pad correction into account
1158 // The equation of a Riemann circle, where the y position is substituted by the
1159 // measured y-position taking pad tilting into account, has to be transformed
1160 // into a 4-dimensional hyperplane equation
1161 // Riemann circle: (x-x0)^2 + (y-y0)^2 -R^2 = 0
1162 // Measured y-Position: ymeas = y - tan(phiT)(zc - zt)
1163 // zc: center of the pad row
1164 // zt: z-position of the track
1165 // The z-position of the track is assumed to be linear dependent on the x-position
1166 // Transformed equation: a + b * u + c * t + d * v + e * w - 2 * (ymeas + tan(phiT) * zc) * t = 0
1167 // Transformation: u = 2 * x * t
1168 // v = 2 * tan(phiT) * t
1169 // w = 2 * tan(phiT) * (x - xref) * t
1170 // t = 1 / (x^2 + ymeas^2)
1171 // Parameters: a = -1/y0
1172 // b = x0/y0
1173 // c = (R^2 -x0^2 - y0^2)/y0
1174 // d = offset
1175 // e = dz/dx
1176 // If the offset respectively the slope in z-position is impossible, the parameters are fixed using
1177 // results from the simple riemann fit. Afterwards the fit is redone.
1178 // The curvature is calculated according to the formula:
1179 // curv = a/(1 + b^2 + c*a) = 1/R
1180 //
1181 // Paramters: - Array of tracklets (connected to the track candidate)
1182 // - Flag selecting the error definition
1183 // Output: - Chi2 values of the track (in Parameter list)
1184 //
1185 TLinearFitter *fitter = GetTiltedRiemanFitter();
1186 fitter->StoreData(kTRUE);
1187 fitter->ClearPoints();
1188 AliTRDLeastSquare zfitter;
1189 AliTRDcluster *cl = 0x0;
3b57a3f7 1190
1191 AliTRDseedV1 work[kNPlanes], *tracklet = 0x0;
1192 if(!tracklets){
1193 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1194 if(!(tracklet = track->GetTracklet(ipl))) continue;
1195 if(!tracklet->IsOK()) continue;
1196 new(&work[ipl]) AliTRDseedV1(*tracklet);
1197 }
1198 tracklets = &work[0];
1199 }
1200
41702fec 1201 Double_t xref = CalculateReferenceX(tracklets);
1202 Double_t x, y, z, t, tilt, dx, w, we;
1203 Double_t uvt[4];
1204 Int_t nPoints = 0;
1205 // Containers for Least-square fitter
1206 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1207 if(!tracklets[ipl].IsOK()) continue;
1208 for(Int_t itb = 0; itb < fgNTimeBins; itb++){
1209 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1210 if (!tracklets[ipl].IsUsable(itb)) continue;
1211 x = cl->GetX();
1212 y = cl->GetY();
1213 z = cl->GetZ();
1214 tilt = tracklets[ipl].GetTilt();
1215 dx = x - xref;
1216 // Transformation
1217 t = 1./(x*x + y*y);
1218 uvt[0] = 2. * x * t;
1219 uvt[1] = t;
1220 uvt[2] = 2. * tilt * t;
1221 uvt[3] = 2. * tilt * dx * t;
1222 w = 2. * (y + tilt*z) * t;
1223 // error definition changes for the different calls
1224 we = 2. * t;
1225 we *= sigError ? tracklets[ipl].GetSigmaY() : 0.2;
1226 fitter->AddPoint(uvt, w, we);
1227 zfitter.AddPoint(&x, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
1228 nPoints++;
1229 }
1230 }
aec26713 1231 if(fitter->Eval()) return 1.E10;
1232
41702fec 1233 Double_t z0 = fitter->GetParameter(3);
1234 Double_t dzdx = fitter->GetParameter(4);
3b57a3f7 1235
1236
1237 // Linear fitter - not possible to make boundaries
1238 // Do not accept non possible z and dzdx combinations
1239 Bool_t accept = kTRUE;
1240 Double_t zref = 0.0;
1241 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
1242 if(!tracklets[iLayer].IsOK()) continue;
1243 zref = z0 + dzdx * (tracklets[iLayer].GetX0() - xref);
1244 if (TMath::Abs(tracklets[iLayer].GetZProb() - zref) > tracklets[iLayer].GetPadLength() * 0.5 + 1.0)
1245 accept = kFALSE;
1246 }
1247 if (!accept) {
41702fec 1248 zfitter.Eval();
3b57a3f7 1249 Double_t dzmf = zfitter.GetFunctionParameter(1);
1250 Double_t zmf = zfitter.GetFunctionValue(&xref);
1251 fitter->FixParameter(3, zmf);
1252 fitter->FixParameter(4, dzmf);
1253 fitter->Eval();
1254 fitter->ReleaseParameter(3);
1255 fitter->ReleaseParameter(4);
1256 z0 = fitter->GetParameter(3); // = zmf ?
1257 dzdx = fitter->GetParameter(4); // = dzmf ?
1258 }
1259
1260 // Calculate Curvature
1261 Double_t a = fitter->GetParameter(0);
1262 Double_t b = fitter->GetParameter(1);
1263 Double_t c = fitter->GetParameter(2);
1264 Double_t y0 = 1. / a;
1265 Double_t x0 = -b * y0;
a015e406 1266 Double_t tmp = y0*y0 + x0*x0 - c*y0;
1267 if(tmp<=0.) return 1.E10;
1268 Double_t R = TMath::Sqrt(tmp);
3b57a3f7 1269 Double_t C = 1.0 + b*b - c*a;
1270 if (C > 0.0) C = a / TMath::Sqrt(C);
1271
1272 // Calculate chi2 of the fit
1273 Double_t chi2 = fitter->GetChisquare()/Double_t(nPoints);
1274
1275 // Update the tracklets
1276 if(!track){
1277 for(Int_t ip = 0; ip < kNPlanes; ip++) {
1278 x = tracklets[ip].GetX0();
90cf7133 1279 tmp = R*R-(x-x0)*(x-x0);
a015e406 1280 if(tmp <= 0.) continue;
1281 tmp = TMath::Sqrt(tmp);
3b57a3f7 1282
1283 // y: R^2 = (x - x0)^2 + (y - y0)^2
1284 // => y = y0 +/- Sqrt(R^2 - (x - x0)^2)
1285 tracklets[ip].SetYref(0, y0 - (y0>0.?1.:-1)*tmp);
1286 // => dy/dx = (x - x0)/Sqrt(R^2 - (x - x0)^2)
1287 tracklets[ip].SetYref(1, (x - x0) / tmp);
1288 tracklets[ip].SetZref(0, z0 + dzdx * (x - xref));
1289 tracklets[ip].SetZref(1, dzdx);
1290 tracklets[ip].SetC(C);
1291 tracklets[ip].SetChi2(chi2);
1292 }
1293 }
1294
1295 //update track points array
1296 if(np && points){
1297 Float_t xyz[3];
1298 for(int ip=0; ip<np; ip++){
1299 points[ip].GetXYZ(xyz);
a015e406 1300 xyz[1] = y0 - (y0>0.?1.:-1.)*TMath::Sqrt(R*R-(xyz[0]-x0)*(xyz[0]-x0));
3b57a3f7 1301 xyz[2] = z0 + dzdx * (xyz[0] - xref);
1302 points[ip].SetXYZ(xyz);
1303 }
1304 }
1305
3b57a3f7 1306 return chi2;
1307}
1308
1309
1bf51039 1310//____________________________________________________________________
1311Double_t AliTRDtrackerV1::FitKalman(AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t up, Int_t np, AliTrackPoint *points)
1312{
1313// Kalman filter implementation for the TRD.
1314// It returns the positions of the fit in the array "points"
1315//
1316// Author : A.Bercuci@gsi.de
1317
1318 //printf("Start track @ x[%f]\n", track->GetX());
1319
1320 //prepare marker points along the track
1321 Int_t ip = np ? 0 : 1;
1322 while(ip<np){
1323 if((up?-1:1) * (track->GetX() - points[ip].GetX()) > 0.) break;
1324 //printf("AliTRDtrackerV1::FitKalman() : Skip track marker x[%d] = %7.3f. Before track start ( %7.3f ).\n", ip, points[ip].GetX(), track->GetX());
1325 ip++;
1326 }
1327 //if(points) printf("First marker point @ x[%d] = %f\n", ip, points[ip].GetX());
1328
1329
1330 AliTRDseedV1 tracklet, *ptrTracklet = 0x0;
1331
1332 //Loop through the TRD planes
1333 for (Int_t jplane = 0; jplane < kNPlanes; jplane++) {
1334 // GET TRACKLET OR BUILT IT
1335 Int_t iplane = up ? jplane : kNPlanes - 1 - jplane;
1336 if(tracklets){
1337 if(!(ptrTracklet = &tracklets[iplane])) continue;
1338 }else{
1339 if(!(ptrTracklet = track->GetTracklet(iplane))){
1340 /*AliTRDtrackerV1 *tracker = 0x0;
1341 if(!(tracker = dynamic_cast<AliTRDtrackerV1*>( AliTRDReconstructor::Tracker()))) continue;
1342 ptrTracklet = new(&tracklet) AliTRDseedV1(iplane);
1343 if(!tracker->MakeTracklet(ptrTracklet, track)) */
1344 continue;
1345 }
1346 }
1347 if(!ptrTracklet->IsOK()) continue;
1348
1349 Double_t x = ptrTracklet->GetX0();
1350
1351 while(ip < np){
1352 //don't do anything if next marker is after next update point.
1353 if((up?-1:1) * (points[ip].GetX() - x) - fgkMaxStep < 0) break;
1354
1355 //printf("Propagate to x[%d] = %f\n", ip, points[ip].GetX());
1356
1357 if(((up?-1:1) * (points[ip].GetX() - track->GetX()) < 0) && !PropagateToX(*track, points[ip].GetX(), fgkMaxStep)) return -1.;
1358
1359 Double_t xyz[3]; // should also get the covariance
1360 track->GetXYZ(xyz); points[ip].SetXYZ(xyz[0], xyz[1], xyz[2]);
1361 ip++;
1362 }
1363 //printf("plane[%d] tracklet[%p] x[%f]\n", iplane, ptrTracklet, x);
1364
1365 //Propagate closer to the next update point
1366 if(((up?-1:1) * (x - track->GetX()) + fgkMaxStep < 0) && !PropagateToX(*track, x + (up?-1:1)*fgkMaxStep, fgkMaxStep)) return -1.;
1367
1368 if(!AdjustSector(track)) return -1;
1369 if(TMath::Abs(track->GetSnp()) > fgkMaxSnp) return -1;
1370
1371 //load tracklet to the tracker and the track
1372/* Int_t index;
1373 if((index = FindTracklet(ptrTracklet)) < 0){
1374 ptrTracklet = SetTracklet(&tracklet);
1375 index = fTracklets->GetEntriesFast()-1;
1376 }
1377 track->SetTracklet(ptrTracklet, index);*/
1378
1379
1380 // register tracklet to track with tracklet creation !!
1381 // PropagateBack : loaded tracklet to the tracker and update index
1382 // RefitInward : update index
1383 // MakeTrack : loaded tracklet to the tracker and update index
1384 if(!tracklets) track->SetTracklet(ptrTracklet, -1);
1385
1386
1387 //Calculate the mean material budget along the path inside the chamber
1388 Double_t xyz0[3]; track->GetXYZ(xyz0);
1389 Double_t alpha = track->GetAlpha();
1390 Double_t xyz1[3], y, z;
1391 if(!track->GetProlongation(x, y, z)) return -1;
1392 xyz1[0] = x * TMath::Cos(alpha) - y * TMath::Sin(alpha);
1393 xyz1[1] = +x * TMath::Sin(alpha) + y * TMath::Cos(alpha);
1394 xyz1[2] = z;
1395 Double_t param[7];
83dea92e 1396 if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param)<=0.) break;
1bf51039 1397 Double_t xrho = param[0]*param[4]; // density*length
1398 Double_t xx0 = param[1]; // radiation length
1399
1400 //Propagate the track
1401 track->PropagateTo(x, xx0, xrho);
1402 if (!AdjustSector(track)) break;
1403
1404 //Update track
1405 Double_t chi2 = track->GetPredictedChi2(ptrTracklet);
1406 if(chi2<1e+10) track->Update(ptrTracklet, chi2);
1407
1408 if(!up) continue;
1409
1410 //Reset material budget if 2 consecutive gold
1411 if(iplane>0 && track->GetTracklet(iplane-1) && ptrTracklet->GetN() + track->GetTracklet(iplane-1)->GetN() > 20) track->SetBudget(2, 0.);
1412 } // end planes loop
1413
1414 // extrapolation
1415 while(ip < np){
1416 if(((up?-1:1) * (points[ip].GetX() - track->GetX()) < 0) && !PropagateToX(*track, points[ip].GetX(), fgkMaxStep)) return -1.;
1417
1418 Double_t xyz[3]; // should also get the covariance
1419 track->GetXYZ(xyz); points[ip].SetXYZ(xyz[0], xyz[1], xyz[2]);
1420 ip++;
1421 }
1422
1423 return track->GetChi2();
1424}
3b57a3f7 1425
eb38ed55 1426//_________________________________________________________________________
bb56afff 1427Float_t AliTRDtrackerV1::CalculateChi2Z(AliTRDseedV1 *tracklets, Double_t offset, Double_t slope, Double_t xref)
eb38ed55 1428{
41702fec 1429 //
1430 // Calculates the chi2-value of the track in z-Direction including tilting pad correction.
1431 // A linear dependence on the x-value serves as a model.
1432 // The parameters are related to the tilted Riemann fit.
1433 // Parameters: - Array of tracklets (AliTRDseedV1) related to the track candidate
1434 // - the offset for the reference x
1435 // - the slope
1436 // - the reference x position
1437 // Output: - The Chi2 value of the track in z-Direction
1438 //
1439 Float_t chi2Z = 0, nLayers = 0;
053767a4 1440 for (Int_t iLayer = 0; iLayer < AliTRDgeometry::kNlayer; iLayer++) {
41702fec 1441 if(!tracklets[iLayer].IsOK()) continue;
1442 Double_t z = offset + slope * (tracklets[iLayer].GetX0() - xref);
1443 chi2Z += TMath::Abs(tracklets[iLayer].GetMeanz() - z);
1444 nLayers++;
1445 }
1446 chi2Z /= TMath::Max((nLayers - 3.0),1.0);
1447 return chi2Z;
eb38ed55 1448}
1449
bccda319 1450//_____________________________________________________________________________
1451Int_t AliTRDtrackerV1::PropagateToX(AliTRDtrackV1 &t, Double_t xToGo, Double_t maxStep)
1452{
41702fec 1453 //
1454 // Starting from current X-position of track <t> this function
1455 // extrapolates the track up to radial position <xToGo>.
1456 // Returns 1 if track reaches the plane, and 0 otherwise
1457 //
bccda319 1458
41702fec 1459 const Double_t kEpsilon = 0.00001;
bccda319 1460
41702fec 1461 // Current track X-position
1462 Double_t xpos = t.GetX();
bccda319 1463
41702fec 1464 // Direction: inward or outward
1465 Double_t dir = (xpos < xToGo) ? 1.0 : -1.0;
bccda319 1466
41702fec 1467 while (((xToGo - xpos) * dir) > kEpsilon) {
bccda319 1468
41702fec 1469 Double_t xyz0[3];
1470 Double_t xyz1[3];
1471 Double_t param[7];
1472 Double_t x;
1473 Double_t y;
1474 Double_t z;
bccda319 1475
41702fec 1476 // The next step size
1477 Double_t step = dir * TMath::Min(TMath::Abs(xToGo-xpos),maxStep);
bccda319 1478
41702fec 1479 // Get the global position of the starting point
1480 t.GetXYZ(xyz0);
bccda319 1481
41702fec 1482 // X-position after next step
1483 x = xpos + step;
bccda319 1484
41702fec 1485 // Get local Y and Z at the X-position of the next step
1486 if (!t.GetProlongation(x,y,z)) {
1487 return 0; // No prolongation possible
1488 }
bccda319 1489
41702fec 1490 // The global position of the end point of this prolongation step
1491 xyz1[0] = x * TMath::Cos(t.GetAlpha()) - y * TMath::Sin(t.GetAlpha());
1492 xyz1[1] = +x * TMath::Sin(t.GetAlpha()) + y * TMath::Cos(t.GetAlpha());
1493 xyz1[2] = z;
bccda319 1494
41702fec 1495 // Calculate the mean material budget between start and
1496 // end point of this prolongation step
83dea92e 1497 if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param)<=0.) return 0;
bccda319 1498
41702fec 1499 // Propagate the track to the X-position after the next step
1500 if (!t.PropagateTo(x,param[1],param[0]*param[4])) {
1501 return 0;
1502 }
bccda319 1503
41702fec 1504 // Rotate the track if necessary
1505 AdjustSector(&t);
bccda319 1506
41702fec 1507 // New track X-position
1508 xpos = t.GetX();
bccda319 1509
41702fec 1510 }
bccda319 1511
41702fec 1512 return 1;
bccda319 1513
1514}
1515
eb38ed55 1516
1517//_____________________________________________________________________________
1518Int_t AliTRDtrackerV1::ReadClusters(TClonesArray* &array, TTree *clusterTree) const
1519{
41702fec 1520 //
1521 // Reads AliTRDclusters from the file.
1522 // The names of the cluster tree and branches
1523 // should match the ones used in AliTRDclusterizer::WriteClusters()
1524 //
1525
1526 Int_t nsize = Int_t(clusterTree->GetTotBytes() / (sizeof(AliTRDcluster)));
1527 TObjArray *clusterArray = new TObjArray(nsize+1000);
1528
1529 TBranch *branch = clusterTree->GetBranch("TRDcluster");
1530 if (!branch) {
1531 AliError("Can't get the branch !");
1532 return 1;
1533 }
1534 branch->SetAddress(&clusterArray);
1535
1536 if(!fClusters){
8ae98148 1537 Float_t nclusters = fReconstructor->GetRecoParam()->GetNClusters();
1538 if(fReconstructor->IsHLT()) nclusters /= AliTRDgeometry::kNsector;
1539 array = new TClonesArray("AliTRDcluster", Int_t(nclusters));
41702fec 1540 array->SetOwner(kTRUE);
1541 }
1542
1543 // Loop through all entries in the tree
1544 Int_t nEntries = (Int_t) clusterTree->GetEntries();
1545 Int_t nbytes = 0;
1546 Int_t ncl = 0;
1547 AliTRDcluster *c = 0x0;
1548 for (Int_t iEntry = 0; iEntry < nEntries; iEntry++) {
1549 // Import the tree
1550 nbytes += clusterTree->GetEvent(iEntry);
1551
1552 // Get the number of points in the detector
1553 Int_t nCluster = clusterArray->GetEntriesFast();
1554 for (Int_t iCluster = 0; iCluster < nCluster; iCluster++) {
1555 if(!(c = (AliTRDcluster *) clusterArray->UncheckedAt(iCluster))) continue;
1556 c->SetInChamber();
1557 new((*fClusters)[ncl++]) AliTRDcluster(*c);
1558 delete (clusterArray->RemoveAt(iCluster));
1559 }
1560
1561 }
1562 delete clusterArray;
1563
1564 return 0;
eb38ed55 1565}
1566
1567//_____________________________________________________________________________
1568Int_t AliTRDtrackerV1::LoadClusters(TTree *cTree)
1569{
41702fec 1570 //
66f6bfd9 1571 // Fills clusters into TRD tracking sectors
41702fec 1572 //
41702fec 1573
48f8adf3 1574 if(!fReconstructor->IsWritingClusters()){
1575 fClusters = AliTRDReconstructor::GetClusters();
1576 } else {
66f6bfd9 1577 if (ReadClusters(fClusters, cTree)) {
1578 AliError("Problem with reading the clusters !");
1579 return 1;
1580 }
1581 }
1582 SetClustersOwner();
1583
48f8adf3 1584 if(!fClusters || !fClusters->GetEntriesFast()){
66f6bfd9 1585 AliInfo("No TRD clusters");
41702fec 1586 return 1;
1587 }
66f6bfd9 1588
1589 //Int_t nin =
1590 BuildTrackingContainers();
1591
1592 //Int_t ncl = fClusters->GetEntriesFast();
1593 //AliInfo(Form("Clusters %d [%6.2f %% in the active volume]", ncl, 100.*float(nin)/ncl));
1594
1595 return 0;
1596}
1597
1598//_____________________________________________________________________________
1599Int_t AliTRDtrackerV1::LoadClusters(TClonesArray *clusters)
1600{
1601 //
1602 // Fills clusters into TRD tracking sectors
1603 // Function for use in the HLT
1604
1605 if(!clusters || !clusters->GetEntriesFast()){
1606 AliInfo("No TRD clusters");
41702fec 1607 return 1;
1608 }
1609
66f6bfd9 1610 fClusters = clusters;
1611 SetClustersOwner();
1612
1613 //Int_t nin =
1614 BuildTrackingContainers();
1615
1616 //Int_t ncl = fClusters->GetEntriesFast();
1617 //AliInfo(Form("Clusters %d [%6.2f %% in the active volume]", ncl, 100.*float(nin)/ncl));
1618
1619 return 0;
1620}
1621
1622
1623//____________________________________________________________________
1624Int_t AliTRDtrackerV1::BuildTrackingContainers()
1625{
1626// Building tracking containers for clusters
1627
1628 Int_t nin =0, icl = fClusters->GetEntriesFast();
41702fec 1629 while (icl--) {
1630 AliTRDcluster *c = (AliTRDcluster *) fClusters->UncheckedAt(icl);
1631 if(c->IsInChamber()) nin++;
1632 Int_t detector = c->GetDetector();
1633 Int_t sector = fGeom->GetSector(detector);
053767a4 1634 Int_t stack = fGeom->GetStack(detector);
1635 Int_t layer = fGeom->GetLayer(detector);
41702fec 1636
053767a4 1637 fTrSec[sector].GetChamber(stack, layer, kTRUE)->InsertCluster(c, icl);
41702fec 1638 }
b0a48c4d 1639
1640 const AliTRDCalDet *cal = AliTRDcalibDB::Instance()->GetT0Det();
053767a4 1641 for(int isector =0; isector<AliTRDgeometry::kNsector; isector++){
41702fec 1642 if(!fTrSec[isector].GetNChambers()) continue;
b0a48c4d 1643 fTrSec[isector].Init(fReconstructor, cal);
41702fec 1644 }
66f6bfd9 1645
1646 return nin;
eb38ed55 1647}
1648
1649
66f6bfd9 1650
0906e73e 1651//____________________________________________________________________
1652void AliTRDtrackerV1::UnloadClusters()
1653{
41702fec 1654 //
1655 // Clears the arrays of clusters and tracks. Resets sectors and timebins
1656 //
0906e73e 1657
41702fec 1658 if(fTracks) fTracks->Delete();
1659 if(fTracklets) fTracklets->Delete();
48f8adf3 1660 if(fClusters){
1661 if(IsClustersOwner()) fClusters->Delete();
1662
1663 // save clusters array in the reconstructor for further use.
1664 if(!fReconstructor->IsWritingClusters()){
1665 AliTRDReconstructor::SetClusters(fClusters);
1666 SetClustersOwner(kFALSE);
1667 } else AliTRDReconstructor::SetClusters(0x0);
1668 }
0906e73e 1669
053767a4 1670 for (int i = 0; i < AliTRDgeometry::kNsector; i++) fTrSec[i].Clear();
0906e73e 1671
41702fec 1672 // Increment the Event Number
1673 AliTRDtrackerDebug::SetEventNumber(AliTRDtrackerDebug::GetEventNumber() + 1);
eb38ed55 1674}
0906e73e 1675
eb38ed55 1676//_____________________________________________________________________________
1677Bool_t AliTRDtrackerV1::AdjustSector(AliTRDtrackV1 *track)
1678{
41702fec 1679 //
1680 // Rotates the track when necessary
1681 //
1682
1683 Double_t alpha = AliTRDgeometry::GetAlpha();
1684 Double_t y = track->GetY();
1685 Double_t ymax = track->GetX()*TMath::Tan(0.5*alpha);
1686
1687 if (y > ymax) {
1688 if (!track->Rotate( alpha)) {
1689 return kFALSE;
1690 }
1691 }
1692 else if (y < -ymax) {
1693 if (!track->Rotate(-alpha)) {
1694 return kFALSE;
1695 }
1696 }
1697
1698 return kTRUE;
0906e73e 1699
1700}
1701
eb38ed55 1702
0906e73e 1703//____________________________________________________________________
1704AliTRDseedV1* AliTRDtrackerV1::GetTracklet(AliTRDtrackV1 *track, Int_t p, Int_t &idx)
1705{
41702fec 1706 // Find tracklet for TRD track <track>
1707 // Parameters
1708 // - track
1709 // - sector
1710 // - plane
1711 // - index
1712 // Output
1713 // tracklet
1714 // index
1715 // Detailed description
1716 //
1717 idx = track->GetTrackletIndex(p);
1718 AliTRDseedV1 *tracklet = (idx==0xffff) ? 0x0 : (AliTRDseedV1*)fTracklets->UncheckedAt(idx);
1719
1720 return tracklet;
0906e73e 1721}
1722
1723//____________________________________________________________________
3b57a3f7 1724AliTRDseedV1* AliTRDtrackerV1::SetTracklet(AliTRDseedV1 *tracklet)
0906e73e 1725{
41702fec 1726 // Add this tracklet to the list of tracklets stored in the tracker
1727 //
1728 // Parameters
1729 // - tracklet : pointer to the tracklet to be added to the list
1730 //
1731 // Output
1732 // - the index of the new tracklet in the tracker tracklets list
1733 //
1734 // Detailed description
1735 // Build the tracklets list if it is not yet created (late initialization)
1736 // and adds the new tracklet to the list.
1737 //
1738 if(!fTracklets){
053767a4 1739 fTracklets = new TClonesArray("AliTRDseedV1", AliTRDgeometry::Nsector()*kMaxTracksStack);
41702fec 1740 fTracklets->SetOwner(kTRUE);
1741 }
1742 Int_t nentries = fTracklets->GetEntriesFast();
1743 return new ((*fTracklets)[nentries]) AliTRDseedV1(*tracklet);
972ef65e 1744}
1745
d20df6fc 1746//____________________________________________________________________
1747AliTRDtrackV1* AliTRDtrackerV1::SetTrack(AliTRDtrackV1 *track)
1748{
1749 // Add this track to the list of tracks stored in the tracker
1750 //
1751 // Parameters
1752 // - track : pointer to the track to be added to the list
1753 //
1754 // Output
1755 // - the pointer added
1756 //
1757 // Detailed description
1758 // Build the tracks list if it is not yet created (late initialization)
1759 // and adds the new track to the list.
1760 //
1761 if(!fTracks){
053767a4 1762 fTracks = new TClonesArray("AliTRDtrackV1", AliTRDgeometry::Nsector()*kMaxTracksStack);
d20df6fc 1763 fTracks->SetOwner(kTRUE);
1764 }
1765 Int_t nentries = fTracks->GetEntriesFast();
1766 return new ((*fTracks)[nentries]) AliTRDtrackV1(*track);
1767}
1768
1769
0906e73e 1770
e4f2f73d 1771//____________________________________________________________________
eb38ed55 1772Int_t AliTRDtrackerV1::Clusters2TracksSM(Int_t sector, AliESDEvent *esd)
e4f2f73d 1773{
41702fec 1774 //
1775 // Steer tracking for one SM.
1776 //
1777 // Parameters :
1778 // sector : Array of (SM) propagation layers containing clusters
1779 // esd : The current ESD event. On output it contains the also
1780 // the ESD (TRD) tracks found in this SM.
1781 //
1782 // Output :
1783 // Number of tracks found in this TRD supermodule.
1784 //
1785 // Detailed description
1786 //
1787 // 1. Unpack AliTRDpropagationLayers objects for each stack.
1788 // 2. Launch stack tracking.
1789 // See AliTRDtrackerV1::Clusters2TracksStack() for details.
1790 // 3. Pack results in the ESD event.
1791 //
1792
1793 // allocate space for esd tracks in this SM
1794 TClonesArray esdTrackList("AliESDtrack", 2*kMaxTracksStack);
1795 esdTrackList.SetOwner();
1796
1797 Int_t nTracks = 0;
1798 Int_t nChambers = 0;
1799 AliTRDtrackingChamber **stack = 0x0, *chamber = 0x0;
053767a4 1800 for(int istack = 0; istack<AliTRDgeometry::kNstack; istack++){
41702fec 1801 if(!(stack = fTrSec[sector].GetStack(istack))) continue;
1802 nChambers = 0;
053767a4 1803 for(int ilayer=0; ilayer<AliTRDgeometry::kNlayer; ilayer++){
1804 if(!(chamber = stack[ilayer])) continue;
3a039a31 1805 if(chamber->GetNClusters() < fgNTimeBins * fReconstructor->GetRecoParam() ->GetFindableClusters()) continue;
41702fec 1806 nChambers++;
053767a4 1807 //AliInfo(Form("sector %d stack %d layer %d clusters %d", sector, istack, ilayer, chamber->GetNClusters()));
41702fec 1808 }
1809 if(nChambers < 4) continue;
1810 //AliInfo(Form("Doing stack %d", istack));
1811 nTracks += Clusters2TracksStack(stack, &esdTrackList);
1812 }
1813 //AliInfo(Form("Found %d tracks in SM %d [%d]\n", nTracks, sector, esd->GetNumberOfTracks()));
1814
1815 for(int itrack=0; itrack<nTracks; itrack++)
1816 esd->AddTrack((AliESDtrack*)esdTrackList[itrack]);
1817
1818 // Reset Track and Candidate Number
1819 AliTRDtrackerDebug::SetCandidateNumber(0);
1820 AliTRDtrackerDebug::SetTrackNumber(0);
1821 return nTracks;
e4f2f73d 1822}
1823
1824//____________________________________________________________________
eb38ed55 1825Int_t AliTRDtrackerV1::Clusters2TracksStack(AliTRDtrackingChamber **stack, TClonesArray *esdTrackList)
e4f2f73d 1826{
41702fec 1827 //
1828 // Make tracks in one TRD stack.
1829 //
1830 // Parameters :
1831 // layer : Array of stack propagation layers containing clusters
1832 // esdTrackList : Array of ESD tracks found by the stand alone tracker.
1833 // On exit the tracks found in this stack are appended.
1834 //
1835 // Output :
1836 // Number of tracks found in this stack.
1837 //
1838 // Detailed description
1839 //
1840 // 1. Find the 3 most useful seeding chambers. See BuildSeedingConfigs() for details.
1841 // 2. Steer AliTRDtrackerV1::MakeSeeds() for 3 seeding layer configurations.
1842 // See AliTRDtrackerV1::MakeSeeds() for more details.
1843 // 3. Arrange track candidates in decreasing order of their quality
1844 // 4. Classify tracks in 5 categories according to:
1845 // a) number of layers crossed
1846 // b) track quality
1847 // 5. Sign clusters by tracks in decreasing order of track quality
1848 // 6. Build AliTRDtrack out of seeding tracklets
1849 // 7. Cook MC label
1850 // 8. Build ESD track and register it to the output list
1851 //
1852
b0a48c4d 1853 const AliTRDCalDet *cal = AliTRDcalibDB::Instance()->GetT0Det();
41702fec 1854 AliTRDtrackingChamber *chamber = 0x0;
1855 AliTRDseedV1 sseed[kMaxTracksStack*6]; // to be initialized
1856 Int_t pars[4]; // MakeSeeds parameters
1857
1858 //Double_t alpha = AliTRDgeometry::GetAlpha();
1859 //Double_t shift = .5 * alpha;
1860 Int_t configs[kNConfigs];
1861
1862 // Build initial seeding configurations
1863 Double_t quality = BuildSeedingConfigs(stack, configs);
3a039a31 1864 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){
41702fec 1865 AliInfo(Form("Plane config %d %d %d Quality %f"
1866 , configs[0], configs[1], configs[2], quality));
1867 }
d931f2aa 1868
41702fec 1869
1870 // Initialize contors
1871 Int_t ntracks, // number of TRD track candidates
1872 ntracks1, // number of registered TRD tracks/iter
1873 ntracks2 = 0; // number of all registered TRD tracks in stack
1874 fSieveSeeding = 0;
d931f2aa 1875
1876 // Get stack index
1877 Int_t ic = 0; AliTRDtrackingChamber **cIter = &stack[0];
1878 while(ic<kNPlanes && !(*cIter)){ic++; cIter++;}
1879 if(!(*cIter)) return ntracks2;
1880 Int_t istack = fGeom->GetStack((*cIter)->GetDetector());
1881
41702fec 1882 do{
1883 // Loop over seeding configurations
1884 ntracks = 0; ntracks1 = 0;
1885 for (Int_t iconf = 0; iconf<3; iconf++) {
1886 pars[0] = configs[iconf];
1887 pars[1] = ntracks;
d931f2aa 1888 pars[2] = istack;
41702fec 1889 ntracks = MakeSeeds(stack, &sseed[6*ntracks], pars);
1890 if(ntracks == kMaxTracksStack) break;
1891 }
3a039a31 1892 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1) AliInfo(Form("Candidate TRD tracks %d in iteration %d.", ntracks, fSieveSeeding));
41702fec 1893
1894 if(!ntracks) break;
1895
1896 // Sort the seeds according to their quality
1897 Int_t sort[kMaxTracksStack];
1898 TMath::Sort(ntracks, fTrackQuality, sort, kTRUE);
1899
1900 // Initialize number of tracks so far and logic switches
1901 Int_t ntracks0 = esdTrackList->GetEntriesFast();
1902 Bool_t signedTrack[kMaxTracksStack];
1903 Bool_t fakeTrack[kMaxTracksStack];
1904 for (Int_t i=0; i<ntracks; i++){
1905 signedTrack[i] = kFALSE;
1906 fakeTrack[i] = kFALSE;
1907 }
1908 //AliInfo("Selecting track candidates ...");
1909
1910 // Sieve clusters in decreasing order of track quality
1911 Double_t trackParams[7];
1912 // AliTRDseedV1 *lseed = 0x0;
1913 Int_t jSieve = 0, candidates;
1914 do{
1915 //AliInfo(Form("\t\tITER = %i ", jSieve));
1916
1917 // Check track candidates
1918 candidates = 0;
1919 for (Int_t itrack = 0; itrack < ntracks; itrack++) {
804bb02e 1920 Int_t trackIndex = sort[itrack];
1921 if (signedTrack[trackIndex] || fakeTrack[trackIndex]) continue;
41702fec 1922
1923
804bb02e 1924 // Calculate track parameters from tracklets seeds
804bb02e 1925 Int_t ncl = 0;
1926 Int_t nused = 0;
1927 Int_t nlayers = 0;
1928 Int_t findable = 0;
1929 for (Int_t jLayer = 0; jLayer < kNPlanes; jLayer++) {
1930 Int_t jseed = kNPlanes*trackIndex+jLayer;
1931 if(!sseed[jseed].IsOK()) continue;
1932 if (TMath::Abs(sseed[jseed].GetYref(0) / sseed[jseed].GetX0()) < 0.15) findable++;
1933
1934 sseed[jseed].UpdateUsed();
1935 ncl += sseed[jseed].GetN2();
1936 nused += sseed[jseed].GetNUsed();
1937 nlayers++;
804bb02e 1938 }
1939
41702fec 1940 // Filter duplicated tracks
1941 if (nused > 30){
1942 //printf("Skip %d nused %d\n", trackIndex, nused);
1943 fakeTrack[trackIndex] = kTRUE;
1944 continue;
1945 }
1946 if (Float_t(nused)/ncl >= .25){
1947 //printf("Skip %d nused/ncl >= .25\n", trackIndex);
1948 fakeTrack[trackIndex] = kTRUE;
1949 continue;
1950 }
1951
1952 // Classify tracks
1953 Bool_t skip = kFALSE;
1954 switch(jSieve){
1955 case 0:
1956 if(nlayers < 6) {skip = kTRUE; break;}
1957 if(TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -5.){skip = kTRUE; break;}
1958 break;
1959
1960 case 1:
1961 if(nlayers < findable){skip = kTRUE; break;}
1962 if(TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -4.){skip = kTRUE; break;}
1963 break;
1964
1965 case 2:
1966 if ((nlayers == findable) || (nlayers == 6)) { skip = kTRUE; break;}
1967 if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -6.0){skip = kTRUE; break;}
1968 break;
1969
1970 case 3:
1971 if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -5.){skip = kTRUE; break;}
1972 break;
1973
1974 case 4:
1975 if (nlayers == 3){skip = kTRUE; break;}
1976 //if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) - nused/(nlayers-3.0) < -15.0){skip = kTRUE; break;}
1977 break;
1978 }
1979 if(skip){
1980 candidates++;
1981 //printf("REJECTED : %d [%d] nlayers %d trackQuality = %e nused %d\n", itrack, trackIndex, nlayers, fTrackQuality[trackIndex], nused);
1982 continue;
1983 }
1984 signedTrack[trackIndex] = kTRUE;
1985
41702fec 1986
1987 // Sign clusters
1988 AliTRDcluster *cl = 0x0; Int_t clusterIndex = -1;
be24510a 1989 for (Int_t jLayer = 0; jLayer < kNPlanes; jLayer++) {
41702fec 1990 Int_t jseed = kNPlanes*trackIndex+jLayer;
1991 if(!sseed[jseed].IsOK()) continue;
1992 if(TMath::Abs(sseed[jseed].GetYfit(1) - sseed[jseed].GetYfit(1)) >= .2) continue; // check this condition with Marian
1993 sseed[jseed].UseClusters();
1994 if(!cl){
90cf7133 1995 ic = 0;
41702fec 1996 while(!(cl = sseed[jseed].GetClusters(ic))) ic++;
1997 clusterIndex = sseed[jseed].GetIndexes(ic);
1998 }
1999 }
2000 if(!cl) continue;
2001
2002
2003 // Build track parameters
2004 AliTRDseedV1 *lseed =&sseed[trackIndex*6];
e79f8eb0 2005/* Int_t idx = 0;
41702fec 2006 while(idx<3 && !lseed->IsOK()) {
2007 idx++;
2008 lseed++;
e79f8eb0 2009 }*/
e79f8eb0 2010 Double_t x = lseed->GetX0();// - 3.5;
41702fec 2011 trackParams[0] = x; //NEW AB
e79f8eb0 2012 trackParams[1] = lseed->GetYref(0); // lseed->GetYat(x);
2013 trackParams[2] = lseed->GetZref(0); // lseed->GetZat(x);
2014 trackParams[3] = TMath::Sin(TMath::ATan(lseed->GetYref(1)));
41702fec 2015 trackParams[4] = lseed->GetZref(1) / TMath::Sqrt(1. + lseed->GetYref(1) * lseed->GetYref(1));
be24510a 2016 trackParams[5] = lseed->GetC();
41702fec 2017 Int_t ich = 0; while(!(chamber = stack[ich])) ich++;
2018 trackParams[6] = fGeom->GetSector(chamber->GetDetector());/* *alpha+shift; // Supermodule*/
2019
3a039a31 2020 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){
41702fec 2021 AliInfo(Form("Track %d [%d] nlayers %d trackQuality = %e nused %d, yref = %3.3f", itrack, trackIndex, nlayers, fTrackQuality[trackIndex], nused, trackParams[1]));
2022
2023 Int_t nclusters = 0;
2024 AliTRDseedV1 *dseed[6];
804bb02e 2025
2026 // Build track label - what happens if measured data ???
2027 Int_t labels[1000];
2028 Int_t outlab[1000];
2029 Int_t nlab = 0;
d877f55f 2030
2031 Int_t labelsall[1000];
2032 Int_t nlabelsall = 0;
2033 Int_t naccepted = 0;
2034
804bb02e 2035 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
2036 Int_t jseed = kNPlanes*trackIndex+iLayer;
2037 dseed[iLayer] = new AliTRDseedV1(sseed[jseed]);
2038 dseed[iLayer]->SetOwner();
2039 nclusters += sseed[jseed].GetN2();
2040 if(!sseed[jseed].IsOK()) continue;
2041 for(int ilab=0; ilab<2; ilab++){
2042 if(sseed[jseed].GetLabels(ilab) < 0) continue;
2043 labels[nlab] = sseed[jseed].GetLabels(ilab);
2044 nlab++;
2045 }
d877f55f 2046
2047 // Cooking label
2048 for (Int_t itime = 0; itime < fgNTimeBins; itime++) {
2049 if(!sseed[jseed].IsUsable(itime)) continue;
2050 naccepted++;
2051 Int_t tindex = 0, ilab = 0;
2052 while(ilab<3 && (tindex = sseed[jseed].GetClusters(itime)->GetLabel(ilab)) >= 0){
2053 labelsall[nlabelsall++] = tindex;
2054 ilab++;
2055 }
2056 }
41702fec 2057 }
804bb02e 2058 Freq(nlab,labels,outlab,kFALSE);
2059 Int_t label = outlab[0];
2060 Int_t frequency = outlab[1];
2061 Freq(nlabelsall,labelsall,outlab,kFALSE);
2062 Int_t label1 = outlab[0];
2063 Int_t label2 = outlab[2];
2064 Float_t fakeratio = (naccepted - outlab[1]) / Float_t(naccepted);
2065
41702fec 2066 //Int_t eventNrInFile = esd->GetEventNumberInFile();
2067 //AliInfo(Form("Number of clusters %d.", nclusters));
2068 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2069 Int_t trackNumber = AliTRDtrackerDebug::GetTrackNumber();
2070 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2071 TTreeSRedirector &cstreamer = *fgDebugStreamer;
2072 cstreamer << "Clusters2TracksStack"
2073 << "EventNumber=" << eventNumber
2074 << "TrackNumber=" << trackNumber
2075 << "CandidateNumber=" << candidateNumber
2076 << "Iter=" << fSieveSeeding
2077 << "Like=" << fTrackQuality[trackIndex]
2078 << "S0.=" << dseed[0]
2079 << "S1.=" << dseed[1]
2080 << "S2.=" << dseed[2]
2081 << "S3.=" << dseed[3]
2082 << "S4.=" << dseed[4]
2083 << "S5.=" << dseed[5]
2084 << "p0=" << trackParams[0]
2085 << "p1=" << trackParams[1]
2086 << "p2=" << trackParams[2]
2087 << "p3=" << trackParams[3]
2088 << "p4=" << trackParams[4]
2089 << "p5=" << trackParams[5]
2090 << "p6=" << trackParams[6]
2091 << "Label=" << label
2092 << "Label1=" << label1
2093 << "Label2=" << label2
2094 << "FakeRatio=" << fakeratio
2095 << "Freq=" << frequency
2096 << "Ncl=" << ncl
2097 << "NLayers=" << nlayers
2098 << "Findable=" << findable
41702fec 2099 << "NUsed=" << nused
2100 << "\n";
2101 }
2102
2103 AliTRDtrackV1 *track = MakeTrack(&sseed[trackIndex*kNPlanes], trackParams);
2104 if(!track){
2105 AliWarning("Fail to build a TRD Track.");
2106 continue;
2107 }
76b60503 2108
41702fec 2109 //AliInfo("End of MakeTrack()");
098c3c3d 2110 AliESDtrack *esdTrack = new ((*esdTrackList)[ntracks0++]) AliESDtrack();
2111 esdTrack->UpdateTrackParams(track, AliESDtrack::kTRDout);
2112 esdTrack->SetLabel(track->GetLabel());
2113 track->UpdateESDtrack(esdTrack);
41702fec 2114 // write ESD-friends if neccessary
3a039a31 2115 if (fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 0){
41702fec 2116 AliTRDtrackV1 *calibTrack = new AliTRDtrackV1(*track);
2117 calibTrack->SetOwner();
098c3c3d 2118 esdTrack->AddCalibObject(calibTrack);
41702fec 2119 }
41702fec 2120 ntracks1++;
2121 AliTRDtrackerDebug::SetTrackNumber(AliTRDtrackerDebug::GetTrackNumber() + 1);
2122 }
2123
2124 jSieve++;
2125 } while(jSieve<5 && candidates); // end track candidates sieve
2126 if(!ntracks1) break;
2127
2128 // increment counters
2129 ntracks2 += ntracks1;
4302c900 2130
2131 if(fReconstructor->IsHLT()) break;
41702fec 2132 fSieveSeeding++;
2133
2134 // Rebuild plane configurations and indices taking only unused clusters into account
2135 quality = BuildSeedingConfigs(stack, configs);
3a039a31 2136 if(quality < 1.E-7) break; //fReconstructor->GetRecoParam() ->GetPlaneQualityThreshold()) break;
41702fec 2137
2138 for(Int_t ip = 0; ip < kNPlanes; ip++){
2139 if(!(chamber = stack[ip])) continue;
b0a48c4d 2140 chamber->Build(fGeom, cal);//Indices(fSieveSeeding);
41702fec 2141 }
2142
3a039a31 2143 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){
41702fec 2144 AliInfo(Form("Sieve level %d Plane config %d %d %d Quality %f", fSieveSeeding, configs[0], configs[1], configs[2], quality));
2145 }
2146 } while(fSieveSeeding<10); // end stack clusters sieve
2147
2148
2149
2150 //AliInfo(Form("Registered TRD tracks %d in stack %d.", ntracks2, pars[1]));
2151
2152 return ntracks2;
e4f2f73d 2153}
2154
2155//___________________________________________________________________
eb38ed55 2156Double_t AliTRDtrackerV1::BuildSeedingConfigs(AliTRDtrackingChamber **stack, Int_t *configs)
e4f2f73d 2157{
41702fec 2158 //
2159 // Assign probabilities to chambers according to their
2160 // capability of producing seeds.
2161 //
2162 // Parameters :
2163 //
2164 // layers : Array of stack propagation layers for all 6 chambers in one stack
2165 // configs : On exit array of configuration indexes (see GetSeedingConfig()
2166 // for details) in the decreasing order of their seeding probabilities.
2167 //
2168 // Output :
2169 //
2170 // Return top configuration quality
2171 //
2172 // Detailed description:
2173 //
2174 // To each chamber seeding configuration (see GetSeedingConfig() for
2175 // the list of all configurations) one defines 2 quality factors:
2176 // - an apriori topological quality (see GetSeedingConfig() for details) and
2177 // - a data quality based on the uniformity of the distribution of
2178 // clusters over the x range (time bins population). See CookChamberQA() for details.
2179 // The overall chamber quality is given by the product of this 2 contributions.
2180 //
2181
2182 Double_t chamberQ[kNPlanes];
2183 AliTRDtrackingChamber *chamber = 0x0;
2184 for(int iplane=0; iplane<kNPlanes; iplane++){
2185 if(!(chamber = stack[iplane])) continue;
2186 chamberQ[iplane] = (chamber = stack[iplane]) ? chamber->GetQuality() : 0.;
2187 }
2188
2189 Double_t tconfig[kNConfigs];
2190 Int_t planes[4];
2191 for(int iconf=0; iconf<kNConfigs; iconf++){
2192 GetSeedingConfig(iconf, planes);
2193 tconfig[iconf] = fgTopologicQA[iconf];
2194 for(int iplane=0; iplane<4; iplane++) tconfig[iconf] *= chamberQ[planes[iplane]];
2195 }
2196
2197 TMath::Sort((Int_t)kNConfigs, tconfig, configs, kTRUE);
2198 // AliInfo(Form("q[%d] = %f", configs[0], tconfig[configs[0]]));
2199 // AliInfo(Form("q[%d] = %f", configs[1], tconfig[configs[1]]));
2200 // AliInfo(Form("q[%d] = %f", configs[2], tconfig[configs[2]]));
2201
2202 return tconfig[configs[0]];
e4f2f73d 2203}
2204
2205//____________________________________________________________________
eb38ed55 2206Int_t AliTRDtrackerV1::MakeSeeds(AliTRDtrackingChamber **stack, AliTRDseedV1 *sseed, Int_t *ipar)
e4f2f73d 2207{
41702fec 2208 //
2209 // Make tracklet seeds in the TRD stack.
2210 //
2211 // Parameters :
2212 // layers : Array of stack propagation layers containing clusters
2213 // sseed : Array of empty tracklet seeds. On exit they are filled.
2214 // ipar : Control parameters:
2215 // ipar[0] -> seeding chambers configuration
2216 // ipar[1] -> stack index
2217 // ipar[2] -> number of track candidates found so far
2218 //
2219 // Output :
2220 // Number of tracks candidates found.
2221 //
2222 // Detailed description
2223 //
2224 // The following steps are performed:
2225 // 1. Select seeding layers from seeding chambers
2226 // 2. Select seeding clusters from the seeding AliTRDpropagationLayerStack.
2227 // The clusters are taken from layer 3, layer 0, layer 1 and layer 2, in
2228 // this order. The parameters controling the range of accepted clusters in
2229 // layer 0, 1, and 2 are defined in AliTRDchamberTimeBin::BuildCond().
2230 // 3. Helix fit of the cluster set. (see AliTRDtrackerFitter::FitRieman(AliTRDcluster**))
2231 // 4. Initialize seeding tracklets in the seeding chambers.
2232 // 5. Filter 0.
2233 // Chi2 in the Y direction less than threshold ... (1./(3. - sLayer))
2234 // Chi2 in the Z direction less than threshold ... (1./(3. - sLayer))
2235 // 6. Attach clusters to seeding tracklets and find linear approximation of
2236 // the tracklet (see AliTRDseedV1::AttachClustersIter()). The number of used
2237 // clusters used by current seeds should not exceed ... (25).
2238 // 7. Filter 1.
2239 // All 4 seeding tracklets should be correctly constructed (see
2240 // AliTRDseedV1::AttachClustersIter())
2241 // 8. Helix fit of the seeding tracklets
2242 // 9. Filter 2.
2243 // Likelihood calculation of the fit. (See AliTRDtrackerV1::CookLikelihood() for details)
2244 // 10. Extrapolation of the helix fit to the other 2 chambers:
2245 // a) Initialization of extrapolation tracklet with fit parameters
2246 // b) Helix fit of tracklets
2247 // c) Attach clusters and linear interpolation to extrapolated tracklets
2248 // d) Helix fit of tracklets
2249 // 11. Improve seeding tracklets quality by reassigning clusters.
2250 // See AliTRDtrackerV1::ImproveSeedQuality() for details.
2251 // 12. Helix fit of all 6 seeding tracklets and chi2 calculation
2252 // 13. Hyperplane fit and track quality calculation. See AliTRDtrackerFitter::FitHyperplane() for details.
2253 // 14. Cooking labels for tracklets. Should be done only for MC
2254 // 15. Register seeds.
2255 //
2256
2257 AliTRDtrackingChamber *chamber = 0x0;
be24510a 2258 AliTRDcluster *c[kNSeedPlanes] = {0x0, 0x0, 0x0, 0x0}; // initilize seeding clusters
41702fec 2259 AliTRDseedV1 *cseed = &sseed[0]; // initialize tracklets for first track
2260 Int_t ncl, mcl; // working variable for looping over clusters
2261 Int_t index[AliTRDchamberTimeBin::kMaxClustersLayer], jndex[AliTRDchamberTimeBin::kMaxClustersLayer];
2262 // chi2 storage
2263 // chi2[0] = tracklet chi2 on the Z direction
2264 // chi2[1] = tracklet chi2 on the R direction
2265 Double_t chi2[4];
2266
e79f8eb0 2267 // Default positions for the anode wire in all 6 Layers in case of a stack with missing clusters
2268 // Positions taken using cosmic data taken with SM3 after rebuild
d931f2aa 2269 Double_t x_def[kNPlanes] = {300.2, 312.8, 325.4, 338.0, 350.6, 363.2};
41702fec 2270
2271 // this should be data member of AliTRDtrack
2272 Double_t seedQuality[kMaxTracksStack];
2273
2274 // unpack control parameters
2275 Int_t config = ipar[0];
2276 Int_t ntracks = ipar[1];
d931f2aa 2277 Int_t istack = ipar[2];
41702fec 2278 Int_t planes[kNSeedPlanes]; GetSeedingConfig(config, planes);
be24510a 2279 Int_t planesExt[kNPlanes-kNSeedPlanes]; GetExtrapolationConfig(config, planesExt);
2280
2281
41702fec 2282 // Init chambers geometry
41702fec 2283 Double_t hL[kNPlanes]; // Tilting angle
2284 Float_t padlength[kNPlanes]; // pad lenghts
2285 AliTRDpadPlane *pp = 0x0;
2286 for(int iplane=0; iplane<kNPlanes; iplane++){
2287 pp = fGeom->GetPadPlane(iplane, istack);
bb79ccd5 2288 hL[iplane] = TMath::Tan(TMath::DegToRad()*pp->GetTiltingAngle());
41702fec 2289 padlength[iplane] = pp->GetLengthIPad();
2290 }
2291
3a039a31 2292 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){
41702fec 2293 AliInfo(Form("Making seeds Stack[%d] Config[%d] Tracks[%d]...", istack, config, ntracks));
2294 }
2295
d931f2aa 2296 // Build seeding layers
d611c74f 2297 ResetSeedTB();
41702fec 2298 Int_t nlayers = 0;
41702fec 2299 for(int isl=0; isl<kNSeedPlanes; isl++){
2300 if(!(chamber = stack[planes[isl]])) continue;
3a039a31 2301 if(!chamber->GetSeedingLayer(fSeedTB[isl], fGeom, fReconstructor)) continue;
41702fec 2302 nlayers++;
41702fec 2303 }
1ba638fc 2304 if(nlayers < 4) return ntracks;
41702fec 2305
2306
2307 // Start finding seeds
2308 Double_t cond0[4], cond1[4], cond2[4];
2309 Int_t icl = 0;
d611c74f 2310 while((c[3] = (*fSeedTB[3])[icl++])){
41702fec 2311 if(!c[3]) continue;
d611c74f 2312 fSeedTB[0]->BuildCond(c[3], cond0, 0);
2313 fSeedTB[0]->GetClusters(cond0, index, ncl);
41702fec 2314 //printf("Found c[3] candidates 0 %d\n", ncl);
2315 Int_t jcl = 0;
2316 while(jcl<ncl) {
d611c74f 2317 c[0] = (*fSeedTB[0])[index[jcl++]];
41702fec 2318 if(!c[0]) continue;
2319 Double_t dx = c[3]->GetX() - c[0]->GetX();
2320 Double_t theta = (c[3]->GetZ() - c[0]->GetZ())/dx;
2321 Double_t phi = (c[3]->GetY() - c[0]->GetY())/dx;
d611c74f 2322 fSeedTB[1]->BuildCond(c[0], cond1, 1, theta, phi);
2323 fSeedTB[1]->GetClusters(cond1, jndex, mcl);
41702fec 2324 //printf("Found c[0] candidates 1 %d\n", mcl);
2325
2326 Int_t kcl = 0;
2327 while(kcl<mcl) {
d611c74f 2328 c[1] = (*fSeedTB[1])[jndex[kcl++]];
2329 if(!c[1]) continue;
2330 fSeedTB[2]->BuildCond(c[1], cond2, 2, theta, phi);
2331 c[2] = fSeedTB[2]->GetNearestCluster(cond2);
2332 //printf("Found c[1] candidate 2 %p\n", c[2]);
2333 if(!c[2]) continue;
2334
2335 // AliInfo("Seeding clusters found. Building seeds ...");
2336 // 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());
2337
804bb02e 2338 for (Int_t il = 0; il < kNPlanes; il++) cseed[il].Reset();
41702fec 2339
d611c74f 2340 FitRieman(c, chi2);
2341
d931f2aa 2342 AliTRDseedV1 *tseed = &cseed[0];
2343 AliTRDtrackingChamber **cIter = &stack[0];
2344 for(int iLayer=0; iLayer<kNPlanes; iLayer++, tseed++, cIter++){
2345 tseed->SetDetector((*cIter) ? (*cIter)->GetDetector() : -1);
43d6ad34 2346 tseed->SetTilt(hL[iLayer]);
2347 tseed->SetPadLength(padlength[iLayer]);
3a039a31 2348 tseed->SetReconstructor(fReconstructor);
d931f2aa 2349 tseed->SetX0((*cIter) ? (*cIter)->GetX() : x_def[iLayer]);
d611c74f 2350 tseed->Init(GetRiemanFitter());
2351 }
2352
2353 Bool_t isFake = kFALSE;
3a039a31 2354 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){
d611c74f 2355 if (c[0]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
2356 if (c[1]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
2357 if (c[2]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
2358
2359 Double_t xpos[4];
2360 for(Int_t l = 0; l < kNSeedPlanes; l++) xpos[l] = fSeedTB[l]->GetX();
2361 Float_t yref[4];
2362 for(int il=0; il<4; il++) yref[il] = cseed[planes[il]].GetYref(0);
2363 Int_t ll = c[3]->GetLabel(0);
2364 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2365 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2366 AliRieman *rim = GetRiemanFitter();
2367 TTreeSRedirector &cs0 = *fgDebugStreamer;
2368 cs0 << "MakeSeeds0"
2369 <<"EventNumber=" << eventNumber
2370 <<"CandidateNumber=" << candidateNumber
2371 <<"isFake=" << isFake
2372 <<"config=" << config
2373 <<"label=" << ll
2374 <<"chi2z=" << chi2[0]
2375 <<"chi2y=" << chi2[1]
2376 <<"Y2exp=" << cond2[0]
2377 <<"Z2exp=" << cond2[1]
2378 <<"X0=" << xpos[0] //layer[sLayer]->GetX()
2379 <<"X1=" << xpos[1] //layer[sLayer + 1]->GetX()
2380 <<"X2=" << xpos[2] //layer[sLayer + 2]->GetX()
2381 <<"X3=" << xpos[3] //layer[sLayer + 3]->GetX()
2382 <<"yref0=" << yref[0]
2383 <<"yref1=" << yref[1]
2384 <<"yref2=" << yref[2]
2385 <<"yref3=" << yref[3]
2386 <<"c0.=" << c[0]
2387 <<"c1.=" << c[1]
2388 <<"c2.=" << c[2]
2389 <<"c3.=" << c[3]
2390 <<"Seed0.=" << &cseed[planes[0]]
2391 <<"Seed1.=" << &cseed[planes[1]]
2392 <<"Seed2.=" << &cseed[planes[2]]
2393 <<"Seed3.=" << &cseed[planes[3]]
2394 <<"RiemanFitter.=" << rim
2395 <<"\n";
2396 }
3a039a31 2397 if(chi2[0] > fReconstructor->GetRecoParam() ->GetChi2Z()/*7./(3. - sLayer)*//*iter*/){
91834b8d 2398// //AliInfo(Form("Failed chi2 filter on chi2Z [%f].", chi2[0]));
d611c74f 2399 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2400 continue;
2401 }
3a039a31 2402 if(chi2[1] > fReconstructor->GetRecoParam() ->GetChi2Y()/*1./(3. - sLayer)*//*iter*/){
91834b8d 2403// //AliInfo(Form("Failed chi2 filter on chi2Y [%f].", chi2[1]));
d611c74f 2404 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2405 continue;
2406 }
2407 //AliInfo("Passed chi2 filter.");
2408
2409 // try attaching clusters to tracklets
2410 Int_t nUsedCl = 0;
2411 Int_t mlayers = 0;
be24510a 2412 for(int iLayer=0; iLayer<kNSeedPlanes; iLayer++){
d611c74f 2413 Int_t jLayer = planes[iLayer];
2414 if(!cseed[jLayer].AttachClustersIter(stack[jLayer], 5., kFALSE, c[iLayer])) continue;
2415 nUsedCl += cseed[jLayer].GetNUsed();
2416 if(nUsedCl > 25) break;
2417 mlayers++;
2418 }
be24510a 2419
2420 if(mlayers < kNSeedPlanes){
2421 //AliInfo(Form("Failed updating all seeds %d [%d].", mlayers, kNSeedPlanes));
2422 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2423 continue;
2424 }
2425
2426 // temporary exit door for the HLT
4302c900 2427 if(fReconstructor->IsHLT()){
be24510a 2428 // attach clusters to extrapolation chambers
2429 for(int iLayer=0; iLayer<kNPlanes-kNSeedPlanes; iLayer++){
2430 Int_t jLayer = planesExt[iLayer];
2431 if(!(chamber = stack[jLayer])) continue;
2432 cseed[jLayer].AttachClustersIter(chamber, 1000.);
2433 }
4302c900 2434 fTrackQuality[ntracks] = 1.; // dummy value
2435 ntracks++;
218ba867 2436 if(ntracks == kMaxTracksStack) return ntracks;
4302c900 2437 cseed += 6;
2438 continue;
2439 }
2440
be24510a 2441
d611c74f 2442 // fit tracklets and cook likelihood
2443 FitTiltedRieman(&cseed[0], kTRUE);// Update Seeds and calculate Likelihood
91834b8d 2444 Double_t like = CookLikelihood(&cseed[0], planes); // to be checked
d611c74f 2445
3a039a31 2446 if (TMath::Log(1.E-9 + like) < fReconstructor->GetRecoParam() ->GetTrackLikelihood()){
d611c74f 2447 //AliInfo(Form("Failed likelihood %f[%e].", TMath::Log(1.E-9 + like), like));
2448 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2449 continue;
2450 }
2451 //AliInfo(Form("Passed likelihood %f[%e].", TMath::Log(1.E-9 + like), like));
2452
2453 // book preliminary results
2454 seedQuality[ntracks] = like;
2455 fSeedLayer[ntracks] = config;/*sLayer;*/
2456
2457 // attach clusters to the extrapolation seeds
d611c74f 2458 Int_t nusedf = 0; // debug value
be24510a 2459 for(int iLayer=0; iLayer<kNPlanes-kNSeedPlanes; iLayer++){
2460 Int_t jLayer = planesExt[iLayer];
d611c74f 2461 if(!(chamber = stack[jLayer])) continue;
d611c74f 2462
2463 // fit extrapolated seed
2464 if ((jLayer == 0) && !(cseed[1].IsOK())) continue;
2465 if ((jLayer == 5) && !(cseed[4].IsOK())) continue;
2466 AliTRDseedV1 pseed = cseed[jLayer];
2467 if(!pseed.AttachClustersIter(chamber, 1000.)) continue;
2468 cseed[jLayer] = pseed;
2469 nusedf += cseed[jLayer].GetNUsed(); // debug value
2470 FitTiltedRieman(cseed, kTRUE);
2471 }
2472
2473 // AliInfo("Extrapolation done.");
2474 // Debug Stream containing all the 6 tracklets
3a039a31 2475 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){
d611c74f 2476 TTreeSRedirector &cstreamer = *fgDebugStreamer;
2477 TLinearFitter *tiltedRieman = GetTiltedRiemanFitter();
2478 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2479 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2480 cstreamer << "MakeSeeds1"
2481 << "EventNumber=" << eventNumber
2482 << "CandidateNumber=" << candidateNumber
2483 << "S0.=" << &cseed[0]
2484 << "S1.=" << &cseed[1]
2485 << "S2.=" << &cseed[2]
2486 << "S3.=" << &cseed[3]
2487 << "S4.=" << &cseed[4]
2488 << "S5.=" << &cseed[5]
2489 << "FitterT.=" << tiltedRieman
2490 << "\n";
2491 }
2492
fb872574 2493 if(fReconstructor->GetRecoParam()->HasImproveTracklets() && ImproveSeedQuality(stack, cseed) < 4){
d611c74f 2494 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2495 continue;
2496 }
2497 //AliInfo("Improve seed quality done.");
2498
2499 // fit full track and cook likelihoods
2500 // Double_t curv = FitRieman(&cseed[0], chi2);
2501 // Double_t chi2ZF = chi2[0] / TMath::Max((mlayers - 3.), 1.);
2502 // Double_t chi2RF = chi2[1] / TMath::Max((mlayers - 3.), 1.);
2503
2504 // do the final track fitting (Once with vertex constraint and once without vertex constraint)
2505 Double_t chi2Vals[3];
2506 chi2Vals[0] = FitTiltedRieman(&cseed[0], kFALSE);
91834b8d 2507 if(fReconstructor->GetRecoParam()->IsVertexConstrained())
d611c74f 2508 chi2Vals[1] = FitTiltedRiemanConstraint(&cseed[0], GetZ()); // Do Vertex Constrained fit if desired
2509 else
2510 chi2Vals[1] = 1.;
2511 chi2Vals[2] = GetChi2Z(&cseed[0]) / TMath::Max((mlayers - 3.), 1.);
2512 // Chi2 definitions in testing stage
2513 //chi2Vals[2] = GetChi2ZTest(&cseed[0]);
2514 fTrackQuality[ntracks] = CalculateTrackLikelihood(&cseed[0], &chi2Vals[0]);
2515 //AliInfo("Hyperplane fit done\n");
2516
2517 // finalize tracklets
2518 Int_t labels[12];
2519 Int_t outlab[24];
2520 Int_t nlab = 0;
2521 for (Int_t iLayer = 0; iLayer < 6; iLayer++) {
2522 if (!cseed[iLayer].IsOK()) continue;
2523
2524 if (cseed[iLayer].GetLabels(0) >= 0) {
2525 labels[nlab] = cseed[iLayer].GetLabels(0);
2526 nlab++;
2527 }
2528
2529 if (cseed[iLayer].GetLabels(1) >= 0) {
2530 labels[nlab] = cseed[iLayer].GetLabels(1);
2531 nlab++;
2532 }
2533 }
2534 Freq(nlab,labels,outlab,kFALSE);
2535 Int_t label = outlab[0];
2536 Int_t frequency = outlab[1];
2537 for (Int_t iLayer = 0; iLayer < 6; iLayer++) {
2538 cseed[iLayer].SetFreq(frequency);
2539 cseed[iLayer].SetChi2Z(chi2[1]);
2540 }
2541
3a039a31 2542 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){
d611c74f 2543 TTreeSRedirector &cstreamer = *fgDebugStreamer;
2544 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2545 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2546 TLinearFitter *fitterTC = GetTiltedRiemanFitterConstraint();
2547 TLinearFitter *fitterT = GetTiltedRiemanFitter();
91834b8d 2548 Int_t ncls = 0;
2549 for(Int_t iseed = 0; iseed < kNPlanes; iseed++){
2550 ncls += cseed[iseed].IsOK() ? cseed[iseed].GetN2() : 0;
2551 }
d611c74f 2552 cstreamer << "MakeSeeds2"
2553 << "EventNumber=" << eventNumber
2554 << "CandidateNumber=" << candidateNumber
2555 << "Chi2TR=" << chi2Vals[0]
2556 << "Chi2TC=" << chi2Vals[1]
2557 << "Nlayers=" << mlayers
91834b8d 2558 << "NClusters=" << ncls
d611c74f 2559 << "NUsedS=" << nUsedCl
2560 << "NUsed=" << nusedf
2561 << "Like=" << like
2562 << "S0.=" << &cseed[0]
2563 << "S1.=" << &cseed[1]
2564 << "S2.=" << &cseed[2]
2565 << "S3.=" << &cseed[3]
2566 << "S4.=" << &cseed[4]
2567 << "S5.=" << &cseed[5]
2568 << "Label=" << label
2569 << "Freq=" << frequency
2570 << "FitterT.=" << fitterT
2571 << "FitterTC.=" << fitterTC
2572 << "\n";
2573 }
2574
2575 ntracks++;
2576 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2577 if(ntracks == kMaxTracksStack){
2578 AliWarning(Form("Number of seeds reached maximum allowed (%d) in stack.", kMaxTracksStack));
2579 return ntracks;
2580 }
2581 cseed += 6;
41702fec 2582 }
2583 }
2584 }
41702fec 2585
2586 return ntracks;
e4f2f73d 2587}
2588
2589//_____________________________________________________________________________
0906e73e 2590AliTRDtrackV1* AliTRDtrackerV1::MakeTrack(AliTRDseedV1 *seeds, Double_t *params)
e4f2f73d 2591{
41702fec 2592 //
2593 // Build a TRD track out of tracklet candidates
2594 //
2595 // Parameters :
2596 // seeds : array of tracklets
2597 // params : track parameters (see MakeSeeds() function body for a detailed description)
2598 //
2599 // Output :
2600 // The TRD track.
2601 //
2602 // Detailed description
2603 //
2604 // To be discussed with Marian !!
2605 //
2606
41702fec 2607
2608 Double_t alpha = AliTRDgeometry::GetAlpha();
2609 Double_t shift = AliTRDgeometry::GetAlpha()/2.0;
2610 Double_t c[15];
2611
2612 c[ 0] = 0.2;
2613 c[ 1] = 0.0; c[ 2] = 2.0;
2614 c[ 3] = 0.0; c[ 4] = 0.0; c[ 5] = 0.02;
2615 c[ 6] = 0.0; c[ 7] = 0.0; c[ 8] = 0.0; c[ 9] = 0.1;
2616 c[10] = 0.0; c[11] = 0.0; c[12] = 0.0; c[13] = 0.0; c[14] = params[5]*params[5]*0.01;
2617
d20df6fc 2618 AliTRDtrackV1 track(seeds, &params[1], c, params[0], params[6]*alpha+shift);
2619 track.PropagateTo(params[0]-5.0);
91834b8d 2620 if(fReconstructor->IsHLT()){
2621 AliTRDseedV1 *ptrTracklet = 0x0;
2622 for(Int_t ip=0; ip<kNPlanes; ip++){
2623 track.UnsetTracklet(ip);
2624 ptrTracklet = SetTracklet(&seeds[ip]);
2625 track.SetTracklet(ptrTracklet, fTracklets->GetEntriesFast()-1);
2626 }
d78d7df0 2627 AliTRDtrackV1 *ptrTrack = SetTrack(&track);
2628 ptrTrack->SetReconstructor(fReconstructor);
2629 return ptrTrack;
91834b8d 2630 }
393fda1c 2631
d20df6fc 2632 track.ResetCovariance(1);
e79f8eb0 2633 Int_t nc = TMath::Abs(FollowBackProlongation(track));
393fda1c 2634 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 5){
2635 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2636 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2637 Double_t p[5]; // Track Params for the Debug Stream
2638 track.GetExternalParameters(params[0], p);
2639 TTreeSRedirector &cs = *fgDebugStreamer;
2640 cs << "MakeTrack"
2641 << "EventNumber=" << eventNumber
2642 << "CandidateNumber=" << candidateNumber
2643 << "nc=" << nc
2644 << "X=" << params[0]
2645 << "Y=" << p[0]
2646 << "Z=" << p[1]
2647 << "snp=" << p[2]
2648 << "tnd=" << p[3]
2649 << "crv=" << p[4]
2650 << "Yin=" << params[1]
2651 << "Zin=" << params[2]
2652 << "snpin=" << params[3]
2653 << "tndin=" << params[4]
2654 << "crvin=" << params[5]
2655 << "track.=" << &track
2656 << "\n";
2657 }
d20df6fc 2658 if (nc < 30) return 0x0;
2659
2660 AliTRDtrackV1 *ptrTrack = SetTrack(&track);
215f7116 2661 ptrTrack->SetReconstructor(fReconstructor);
48f8adf3 2662 ptrTrack->CookLabel(.9);
24253b0a 2663
d20df6fc 2664 // computes PID for track
2665 ptrTrack->CookPID();
2666 // update calibration references using this track
48f8adf3 2667 AliTRDCalibraFillHisto *calibra = AliTRDCalibraFillHisto::Instance();
2668 if (!calibra){
2669 AliInfo("Could not get Calibra instance\n");
2670 if(calibra->GetHisto2d()) calibra->UpdateHistogramsV1(ptrTrack);
2671 }
d20df6fc 2672 return ptrTrack;
e4f2f73d 2673}
2674
0906e73e 2675
2676//____________________________________________________________________
eb38ed55 2677Int_t AliTRDtrackerV1::ImproveSeedQuality(AliTRDtrackingChamber **stack, AliTRDseedV1 *cseed)
e4f2f73d 2678{
41702fec 2679 //
2680 // Sort tracklets according to "quality" and try to "improve" the first 4 worst
2681 //
2682 // Parameters :
2683 // layers : Array of propagation layers for a stack/supermodule
2684 // cseed : Array of 6 seeding tracklets which has to be improved
2685 //
2686 // Output :
2687 // cssed : Improved seeds
2688 //
2689 // Detailed description
2690 //
2691 // Iterative procedure in which new clusters are searched for each
2692 // tracklet seed such that the seed quality (see AliTRDseed::GetQuality())
2693 // can be maximized. If some optimization is found the old seeds are replaced.
2694 //
2695 // debug level: 7
2696 //
2697
2698 // make a local working copy
2699 AliTRDtrackingChamber *chamber = 0x0;
2700 AliTRDseedV1 bseed[6];
2701 Int_t nLayers = 0;
2702 for (Int_t jLayer = 0; jLayer < 6; jLayer++) bseed[jLayer] = cseed[jLayer];
2703
2704 Float_t lastquality = 10000.0;
2705 Float_t lastchi2 = 10000.0;
2706 Float_t chi2 = 1000.0;
2707
2708 for (Int_t iter = 0; iter < 4; iter++) {
2709 Float_t sumquality = 0.0;
2710 Float_t squality[6];
2711 Int_t sortindexes[6];
2712
2713 for (Int_t jLayer = 0; jLayer < 6; jLayer++) {
3a039a31 2714 squality[jLayer] = bseed[jLayer].IsOK() ? bseed[jLayer].GetQuality(kTRUE) : 1000.;
41702fec 2715 sumquality += squality[jLayer];
2716 }
2717 if ((sumquality >= lastquality) || (chi2 > lastchi2)) break;
2718
2719 nLayers = 0;
2720 lastquality = sumquality;
2721 lastchi2 = chi2;
2722 if (iter > 0) for (Int_t jLayer = 0; jLayer < 6; jLayer++) cseed[jLayer] = bseed[jLayer];
2723
2724 TMath::Sort(6, squality, sortindexes, kFALSE);
2725 for (Int_t jLayer = 5; jLayer > 1; jLayer--) {
2726 Int_t bLayer = sortindexes[jLayer];
2727 if(!(chamber = stack[bLayer])) continue;
2728 bseed[bLayer].AttachClustersIter(chamber, squality[bLayer], kTRUE);
2729 if(bseed[bLayer].IsOK()) nLayers++;
2730 }
2731
2732 chi2 = FitTiltedRieman(bseed, kTRUE);
3a039a31 2733 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 7){
41702fec 2734 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2735 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2736 TLinearFitter *tiltedRieman = GetTiltedRiemanFitter();
2737 TTreeSRedirector &cstreamer = *fgDebugStreamer;
2738 cstreamer << "ImproveSeedQuality"
2739 << "EventNumber=" << eventNumber
2740 << "CandidateNumber=" << candidateNumber
2741 << "Iteration=" << iter
2742 << "S0.=" << &bseed[0]
2743 << "S1.=" << &bseed[1]
2744 << "S2.=" << &bseed[2]
2745 << "S3.=" << &bseed[3]
2746 << "S4.=" << &bseed[4]
2747 << "S5.=" << &bseed[5]
2748 << "FitterT.=" << tiltedRieman
2749 << "\n";
2750 }
2751 } // Loop: iter
2752
2753 // we are sure that at least 2 tracklets are OK !
2754 return nLayers+2;
e4f2f73d 2755}
2756
eb38ed55 2757//_________________________________________________________________________
2758Double_t AliTRDtrackerV1::CalculateTrackLikelihood(AliTRDseedV1 *tracklets, Double_t *chi2){
41702fec 2759 //
2760 // Calculates the Track Likelihood value. This parameter serves as main quality criterion for
2761 // the track selection
2762 // The likelihood value containes:
2763 // - The chi2 values from the both fitters and the chi2 values in z-direction from a linear fit
2764 // - The Sum of the Parameter |slope_ref - slope_fit|/Sigma of the tracklets
2765 // For all Parameters an exponential dependency is used
2766 //
2767 // Parameters: - Array of tracklets (AliTRDseedV1) related to the track candidate
2768 // - Array of chi2 values:
2769 // * Non-Constrained Tilted Riemann fit
2770 // * Vertex-Constrained Tilted Riemann fit
2771 // * z-Direction from Linear fit
2772 // Output: - The calculated track likelihood
2773 //
2774 // debug level 2
2775 //
2776
2777 Double_t sumdaf = 0, nLayers = 0;
2778 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
2779 if(!tracklets[iLayer].IsOK()) continue;
2780 sumdaf += TMath::Abs((tracklets[iLayer].GetYfit(1) - tracklets[iLayer].GetYref(1))/ tracklets[iLayer].GetSigmaY2());
2781 nLayers++;
2782 }
2783 sumdaf /= Float_t (nLayers - 2.0);
2784
2785 Double_t likeChi2Z = TMath::Exp(-chi2[2] * 0.14); // Chi2Z
3a039a31 2786 Double_t likeChi2TC = (fReconstructor->GetRecoParam() ->IsVertexConstrained()) ?
d20df6fc 2787 TMath::Exp(-chi2[1] * 0.677) : 1; // Constrained Tilted Riemann
41702fec 2788 Double_t likeChi2TR = TMath::Exp(-chi2[0] * 0.78); // Non-constrained Tilted Riemann
2789 Double_t likeAF = TMath::Exp(-sumdaf * 3.23);
2790 Double_t trackLikelihood = likeChi2Z * likeChi2TR * likeAF;
2791
3a039a31 2792 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){
41702fec 2793 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2794 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2795 TTreeSRedirector &cstreamer = *fgDebugStreamer;
2796 cstreamer << "CalculateTrackLikelihood0"
2797 << "EventNumber=" << eventNumber
2798 << "CandidateNumber=" << candidateNumber
2799 << "LikeChi2Z=" << likeChi2Z
2800 << "LikeChi2TR=" << likeChi2TR
2801 << "LikeChi2TC=" << likeChi2TC
2802 << "LikeAF=" << likeAF
2803 << "TrackLikelihood=" << trackLikelihood
2804 << "\n";
2805 }
2806
2807 return trackLikelihood;
e4f2f73d 2808}
2809
2810//____________________________________________________________________
91834b8d 2811Double_t AliTRDtrackerV1::CookLikelihood(AliTRDseedV1 *cseed, Int_t planes[4])
e4f2f73d 2812{
41702fec 2813 //
2814 // Calculate the probability of this track candidate.
2815 //
2816 // Parameters :
2817 // cseeds : array of candidate tracklets
2818 // planes : array of seeding planes (see seeding configuration)
2819 // chi2 : chi2 values (on the Z and Y direction) from the rieman fit of the track.
2820 //
2821 // Output :
2822 // likelihood value
2823 //
2824 // Detailed description
2825 //
2826 // The track quality is estimated based on the following 4 criteria:
2827 // 1. precision of the rieman fit on the Y direction (likea)
2828 // 2. chi2 on the Y direction (likechi2y)
2829 // 3. chi2 on the Z direction (likechi2z)
2830 // 4. number of attached clusters compared to a reference value
2831 // (see AliTRDrecoParam::fkFindable) (likeN)
2832 //
2833 // The distributions for each type of probabilities are given below as of
2834 // (date). They have to be checked to assure consistency of estimation.
2835 //
2836
2837 // ratio of the total number of clusters/track which are expected to be found by the tracker.
91834b8d 2838 const AliTRDrecoParam *fRecoPars = fReconstructor->GetRecoParam();
41702fec 2839
91834b8d 2840 Double_t chi2y = GetChi2Y(&cseed[0]);
2841 Double_t chi2z = GetChi2Z(&cseed[0]);
2842
8ae98148 2843 Float_t nclusters = 0.;
41702fec 2844 Double_t sumda = 0.;
2845 for(UChar_t ilayer = 0; ilayer < 4; ilayer++){
2846 Int_t jlayer = planes[ilayer];
2847 nclusters += cseed[jlayer].GetN2();
2848 sumda += TMath::Abs(cseed[jlayer].GetYfitR(1) - cseed[jlayer].GetYref(1));
2849 }
8ae98148 2850 nclusters *= .25;
2851
5a2e200c 2852 Double_t likea = TMath::Exp(-sumda * fRecoPars->GetPhiSlope());
41702fec 2853 Double_t likechi2y = 0.0000000001;
5a2e200c 2854 if (fReconstructor->IsCosmic() || chi2y < fRecoPars->GetChi2YCut()) likechi2y += TMath::Exp(-TMath::Sqrt(chi2y) * fRecoPars->GetChi2YSlope());
2855 Double_t likechi2z = TMath::Exp(-chi2z * fRecoPars->GetChi2ZSlope());
8ae98148 2856 Double_t likeN = TMath::Exp(-(fRecoPars->GetNMeanClusters() - nclusters) / fRecoPars->GetNSigmaClusters());
41702fec 2857 Double_t like = likea * likechi2y * likechi2z * likeN;
2858
2859 // AliInfo(Form("sumda(%f) chi2[0](%f) chi2[1](%f) likea(%f) likechi2y(%f) likechi2z(%f) nclusters(%d) likeN(%f)", sumda, chi2[0], chi2[1], likea, likechi2y, likechi2z, nclusters, likeN));
3a039a31 2860 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){
41702fec 2861 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2862 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
91834b8d 2863 Int_t nTracklets = 0; Float_t mean_ncls = 0;
2864 for(Int_t iseed=0; iseed < kNPlanes; iseed++){
2865 if(!cseed[iseed].IsOK()) continue;
2866 nTracklets++;
2867 mean_ncls += cseed[iseed].GetN2();
2868 }
2869 if(nTracklets) mean_ncls /= nTracklets;
41702fec 2870 // The Debug Stream contains the seed
2871 TTreeSRedirector &cstreamer = *fgDebugStreamer;
2872 cstreamer << "CookLikelihood"
2873 << "EventNumber=" << eventNumber
2874 << "CandidateNumber=" << candidateNumber
2875 << "tracklet0.=" << &cseed[0]
2876 << "tracklet1.=" << &cseed[1]
2877 << "tracklet2.=" << &cseed[2]
2878 << "tracklet3.=" << &cseed[3]
2879 << "tracklet4.=" << &cseed[4]
2880 << "tracklet5.=" << &cseed[5]
2881 << "sumda=" << sumda
91834b8d 2882 << "chi2y=" << chi2y
2883 << "chi2z=" << chi2z
41702fec 2884 << "likea=" << likea
2885 << "likechi2y=" << likechi2y
2886 << "likechi2z=" << likechi2z
2887 << "nclusters=" << nclusters
2888 << "likeN=" << likeN
2889 << "like=" << like
91834b8d 2890 << "meanncls=" << mean_ncls
41702fec 2891 << "\n";
2892 }
2893
2894 return like;
e4f2f73d 2895}
2896
e4f2f73d 2897//____________________________________________________________________
0906e73e 2898void AliTRDtrackerV1::GetSeedingConfig(Int_t iconfig, Int_t planes[4])
e4f2f73d 2899{
41702fec 2900 //
2901 // Map seeding configurations to detector planes.
2902 //
2903 // Parameters :
2904 // iconfig : configuration index
2905 // planes : member planes of this configuration. On input empty.
2906 //
2907 // Output :
2908 // planes : contains the planes which are defining the configuration
2909 //
2910 // Detailed description
2911 //
2912 // Here is the list of seeding planes configurations together with
2913 // their topological classification:
2914 //
2915 // 0 - 5432 TQ 0
2916 // 1 - 4321 TQ 0
2917 // 2 - 3210 TQ 0
2918 // 3 - 5321 TQ 1
2919 // 4 - 4210 TQ 1
2920 // 5 - 5431 TQ 1
2921 // 6 - 4320 TQ 1
2922 // 7 - 5430 TQ 2
2923 // 8 - 5210 TQ 2
2924 // 9 - 5421 TQ 3
2925 // 10 - 4310 TQ 3
2926 // 11 - 5410 TQ 4
2927 // 12 - 5420 TQ 5
2928 // 13 - 5320 TQ 5
2929 // 14 - 5310 TQ 5
2930 //
2931 // The topologic quality is modeled as follows:
2932 // 1. The general model is define by the equation:
2933 // p(conf) = exp(-conf/2)
2934 // 2. According to the topologic classification, configurations from the same
2935 // class are assigned the agerage value over the model values.
2936 // 3. Quality values are normalized.
2937 //
2938 // The topologic quality distribution as function of configuration is given below:
2939 //Begin_Html
2940 // <img src="gif/topologicQA.gif">
2941 //End_Html
2942 //
2943
2944 switch(iconfig){
2945 case 0: // 5432 TQ 0
2946 planes[0] = 2;
2947 planes[1] = 3;
2948 planes[2] = 4;
2949 planes[3] = 5;
2950 break;
2951 case 1: // 4321 TQ 0
2952 planes[0] = 1;
2953 planes[1] = 2;
2954 planes[2] = 3;
2955 planes[3] = 4;
2956 break;
2957 case 2: // 3210 TQ 0
2958 planes[0] = 0;
2959 planes[1] = 1;
2960 planes[2] = 2;
2961 planes[3] = 3;
2962 break;
2963 case 3: // 5321 TQ 1
2964 planes[0] = 1;
2965 planes[1] = 2;
2966 planes[2] = 3;
2967 planes[3] = 5;
2968 break;
2969 case 4: // 4210 TQ 1
2970 planes[0] = 0;
2971 planes[1] = 1;
2972 planes[2] = 2;
2973 planes[3] = 4;
2974 break;
2975 case 5: // 5431 TQ 1
2976 planes[0] = 1;
2977 planes[1] = 3;
2978 planes[2] = 4;
2979 planes[3] = 5;
2980 break;
2981 case 6: // 4320 TQ 1
2982 planes[0] = 0;
2983 planes[1] = 2;
2984 planes[2] = 3;
2985 planes[3] = 4;
2986 break;
2987 case 7: // 5430 TQ 2
2988 planes[0] = 0;
2989 planes[1] = 3;
2990 planes[2] = 4;
2991 planes[3] = 5;
2992 break;
2993 case 8: // 5210 TQ 2
2994 planes[0] = 0;
2995 planes[1] = 1;
2996 planes[2] = 2;
2997 planes[3] = 5;
2998 break;
2999 case 9: // 5421 TQ 3
3000 planes[0] = 1;
3001 planes[1] = 2;
3002 planes[2] = 4;
3003 planes[3] = 5;
3004 break;
3005 case 10: // 4310 TQ 3
3006 planes[0] = 0;
3007 planes[1] = 1;
3008 planes[2] = 3;
3009 planes[3] = 4;
3010 break;
3011 case 11: // 5410 TQ 4
3012 planes[0] = 0;
3013 planes[1] = 1;
3014 planes[2] = 4;
3015 planes[3] = 5;
3016 break;
3017 case 12: // 5420 TQ 5
3018 planes[0] = 0;
3019 planes[1] = 2;
3020 planes[2] = 4;
3021 planes[3] = 5;
3022 break;
3023 case 13: // 5320 TQ 5
3024 planes[0] = 0;
3025 planes[1] = 2;
3026 planes[2] = 3;
3027 planes[3] = 5;
3028 break;
3029 case 14: // 5310 TQ 5
3030 planes[0] = 0;
3031 planes[1] = 1;
3032 planes[2] = 3;
3033 planes[3] = 5;
3034 break;
3035 }
e4f2f73d 3036}
3037
3038//____________________________________________________________________
0906e73e 3039void AliTRDtrackerV1::GetExtrapolationConfig(Int_t iconfig, Int_t planes[2])
e4f2f73d 3040{
41702fec 3041 //
3042 // Returns the extrapolation planes for a seeding configuration.
3043 //
3044 // Parameters :
3045 // iconfig : configuration index
3046 // planes : planes which are not in this configuration. On input empty.
3047 //
3048 // Output :
3049 // planes : contains the planes which are not in the configuration
3050 //
3051 // Detailed description
3052 //
3053
3054 switch(iconfig){
3055 case 0: // 5432 TQ 0
3056 planes[0] = 1;
3057 planes[1] = 0;
3058 break;
3059 case 1: // 4321 TQ 0
3060 planes[0] = 5;
3061 planes[1] = 0;
3062 break;
3063 case 2: // 3210 TQ 0
3064 planes[0] = 4;
3065 planes[1] = 5;
3066 break;
3067 case 3: // 5321 TQ 1
3068 planes[0] = 4;
3069 planes[1] = 0;
3070 break;
3071 case 4: // 4210 TQ 1
3072 planes[0] = 5;
3073 planes[1] = 3;
3074 break;
3075 case 5: // 5431 TQ 1
3076 planes[0] = 2;
3077 planes[1] = 0;
3078 break;
3079 case 6: // 4320 TQ 1
3080 planes[0] = 5;
3081 planes[1] = 1;
3082 break;
3083 case 7: // 5430 TQ 2
3084 planes[0] = 2;
3085 planes[1] = 1;
3086 break;
3087 case 8: // 5210 TQ 2
3088 planes[0] = 4;
3089 planes[1] = 3;
3090 break;
3091 case 9: // 5421 TQ 3
3092 planes[0] = 3;
3093 planes[1] = 0;
3094 break;
3095 case 10: // 4310 TQ 3
3096 planes[0] = 5;
3097 planes[1] = 2;
3098 break;
3099 case 11: // 5410 TQ 4
3100 planes[0] = 3;
3101 planes[1] = 2;
3102 break;
3103 case 12: // 5420 TQ 5
3104 planes[0] = 3;
3105 planes[1] = 1;
3106 break;
3107 case 13: // 5320 TQ 5
3108 planes[0] = 4;
3109 planes[1] = 1;
3110 break;
3111 case 14: // 5310 TQ 5
3112 planes[0] = 4;
3113 planes[1] = 2;
3114 break;
3115 }
e4f2f73d 3116}
eb38ed55 3117
3118//____________________________________________________________________
3119AliCluster* AliTRDtrackerV1::GetCluster(Int_t idx) const
3120{
41702fec 3121 Int_t ncls = fClusters->GetEntriesFast();
2f7514a6 3122 return idx >= 0 && idx < ncls ? (AliCluster*)fClusters->UncheckedAt(idx) : 0x0;
eb38ed55 3123}
3124
bb56afff 3125//____________________________________________________________________
3b57a3f7 3126AliTRDseedV1* AliTRDtrackerV1::GetTracklet(Int_t idx) const
3127{
41702fec 3128 Int_t ntrklt = fTracklets->GetEntriesFast();
2f7514a6 3129 return idx >= 0 && idx < ntrklt ? (AliTRDseedV1*)fTracklets->UncheckedAt(idx) : 0x0;
3b57a3f7 3130}
3131
3132//____________________________________________________________________
3133AliKalmanTrack* AliTRDtrackerV1::GetTrack(Int_t idx) const
3134{
41702fec 3135 Int_t ntrk = fTracks->GetEntriesFast();
2f7514a6 3136 return idx >= 0 && idx < ntrk ? (AliKalmanTrack*)fTracks->UncheckedAt(idx) : 0x0;
3b57a3f7 3137}
3138
3139//____________________________________________________________________
bb56afff 3140Float_t AliTRDtrackerV1::CalculateReferenceX(AliTRDseedV1 *tracklets){
41702fec 3141 //
3142 // Calculates the reference x-position for the tilted Rieman fit defined as middle
3143 // of the stack (middle between layers 2 and 3). For the calculation all the tracklets
3144 // are taken into account
3145 //
3146 // Parameters: - Array of tracklets(AliTRDseedV1)
3147 //
3148 // Output: - The reference x-position(Float_t)
3149 //
3150 Int_t nDistances = 0;
3151 Float_t meanDistance = 0.;
3152 Int_t startIndex = 5;
3153 for(Int_t il =5; il > 0; il--){
3154 if(tracklets[il].IsOK() && tracklets[il -1].IsOK()){
3155 Float_t xdiff = tracklets[il].GetX0() - tracklets[il -1].GetX0();
3156 meanDistance += xdiff;
3157 nDistances++;
3158 }
3159 if(tracklets[il].IsOK()) startIndex = il;
3160 }
3161 if(tracklets[0].IsOK()) startIndex = 0;
3162 if(!nDistances){
3163 // We should normally never get here
3164 Float_t xpos[2]; memset(xpos, 0, sizeof(Float_t) * 2);
3165 Int_t iok = 0, idiff = 0;
3166 // This attempt is worse and should be avoided:
3167 // check for two chambers which are OK and repeat this without taking the mean value
3168 // Strategy avoids a division by 0;
3169 for(Int_t il = 5; il >= 0; il--){
3170 if(tracklets[il].IsOK()){
3171 xpos[iok] = tracklets[il].GetX0();
3172 iok++;
3173 startIndex = il;
3174 }
3175 if(iok) idiff++; // to get the right difference;
3176 if(iok > 1) break;
3177 }
3178 if(iok > 1){
3179 meanDistance = (xpos[0] - xpos[1])/idiff;
3180 }
3181 else{
3182 // we have do not even have 2 layers which are OK? The we do not need to fit at all
3183 return 331.;
3184 }
3185 }
3186 else{
3187 meanDistance /= nDistances;
3188 }
3189 return tracklets[startIndex].GetX0() + (2.5 - startIndex) * meanDistance - 0.5 * (AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick());
bb56afff 3190}
eb38ed55 3191
3192//_____________________________________________________________________________
3193Int_t AliTRDtrackerV1::Freq(Int_t n, const Int_t *inlist
41702fec 3194 , Int_t *outlist, Bool_t down)
eb38ed55 3195{
41702fec 3196 //
3197 // Sort eleements according occurancy
3198 // The size of output array has is 2*n
3199 //
3200
3201 if (n <= 0) {
3202 return 0;
3203 }
3204
3205 Int_t *sindexS = new Int_t[n]; // Temporary array for sorting
3206 Int_t *sindexF = new Int_t[2*n];
3207 for (Int_t i = 0; i < n; i++) {
3208 sindexF[i] = 0;
3209 }
3210
3211 TMath::Sort(n,inlist,sindexS,down);
3212
3213 Int_t last = inlist[sindexS[0]];
3214 Int_t val = last;
3215 sindexF[0] = 1;
3216 sindexF[0+n] = last;
3217 Int_t countPos = 0;
3218
3219 // Find frequency
3220 for (Int_t i = 1; i < n; i++) {
3221 val = inlist[sindexS[i]];
3222 if (last == val) {
3223 sindexF[countPos]++;
3224 }
3225 else {
3226 countPos++;
3227 sindexF[countPos+n] = val;
3228 sindexF[countPos]++;
3229 last = val;
3230 }
3231 }
3232 if (last == val) {
3233 countPos++;
3234 }
3235
3236 // Sort according frequency
3237 TMath::Sort(countPos,sindexF,sindexS,kTRUE);
3238
3239 for (Int_t i = 0; i < countPos; i++) {
3240 outlist[2*i ] = sindexF[sindexS[i]+n];
3241 outlist[2*i+1] = sindexF[sindexS[i]];
3242 }
3243
3244 delete [] sindexS;
3245 delete [] sindexF;
3246
3247 return countPos;
eb38ed55 3248
3249}
bb56afff 3250
06b32d95 3251
3252//____________________________________________________________________
3253void AliTRDtrackerV1::SetReconstructor(const AliTRDReconstructor *rec)
3254{
3255 fReconstructor = rec;
3256 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){
3257 if(!fgDebugStreamer){
3258 TDirectory *savedir = gDirectory;
3259 fgDebugStreamer = new TTreeSRedirector("TRD.TrackerDebug.root");
3260 savedir->cd();
3261 }
3262 }
acd241e9 3263}
3264
bb56afff 3265//_____________________________________________________________________________
3266Float_t AliTRDtrackerV1::GetChi2Y(AliTRDseedV1 *tracklets) const
3267{
41702fec 3268 // Chi2 definition on y-direction
3269
3270 Float_t chi2 = 0;
3271 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
3272 if(!tracklets[ipl].IsOK()) continue;
91834b8d 3273 Double_t distLayer = (tracklets[ipl].GetYfit(0) - tracklets[ipl].GetYref(0));// /tracklets[ipl].GetSigmaY();
41702fec 3274 chi2 += distLayer * distLayer;
3275 }
3276 return chi2;
bb56afff 3277}
3278
d611c74f 3279//____________________________________________________________________
3280void AliTRDtrackerV1::ResetSeedTB()
3281{
3282// reset buffer for seeding time bin layers. If the time bin
3283// layers are not allocated this function allocates them
3284
3285 for(Int_t isl=0; isl<kNSeedPlanes; isl++){
3286 if(!fSeedTB[isl]) fSeedTB[isl] = new AliTRDchamberTimeBin();
3287 else fSeedTB[isl]->Clear();
3288 }
3289}
3290
bb56afff 3291//_____________________________________________________________________________
3292Float_t AliTRDtrackerV1::GetChi2Z(AliTRDseedV1 *tracklets) const
3293{
91834b8d 3294 // Calculates normalized chi2 in z-direction
41702fec 3295
3296 Float_t chi2 = 0;
91834b8d 3297 // chi2 = Sum ((z - zmu)/sigma)^2
3298 // Sigma for the z direction is defined as half of the padlength
41702fec 3299 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
3300 if(!tracklets[ipl].IsOK()) continue;
91834b8d 3301 Double_t distLayer = (tracklets[ipl].GetMeanz() - tracklets[ipl].GetZref(0)); // /(tracklets[ipl].GetPadLength()/2);
41702fec 3302 chi2 += distLayer * distLayer;
3303 }
3304 return chi2;
bb56afff 3305}
8acca6a3 3306
3307///////////////////////////////////////////////////////
3308// //
3309// Resources of class AliTRDLeastSquare //
3310// //
3311///////////////////////////////////////////////////////
3312
3313//_____________________________________________________________________________
3314AliTRDtrackerV1::AliTRDLeastSquare::AliTRDLeastSquare(){
41702fec 3315 //
3316 // Constructor of the nested class AliTRDtrackFitterLeastSquare
3317 //
3318 memset(fParams, 0, sizeof(Double_t) * 2);
3319 memset(fSums, 0, sizeof(Double_t) * 5);
3320 memset(fCovarianceMatrix, 0, sizeof(Double_t) * 3);
8acca6a3 3321
3322}
3323
3324//_____________________________________________________________________________
3325void AliTRDtrackerV1::AliTRDLeastSquare::AddPoint(Double_t *x, Double_t y, Double_t sigmaY){
41702fec 3326 //
3327 // Adding Point to the fitter
3328 //
3329 Double_t weight = 1/(sigmaY * sigmaY);
3330 Double_t &xpt = *x;
3331 // printf("Adding point x = %f, y = %f, sigma = %f\n", xpt, y, sigmaY);
3332 fSums[0] += weight;
3333 fSums[1] += weight * xpt;
3334 fSums[2] += weight * y;
3335 fSums[3] += weight * xpt * y;
3336 fSums[4] += weight * xpt * xpt;
3337 fSums[5] += weight * y * y;
8acca6a3 3338}
3339
3340//_____________________________________________________________________________
3341void AliTRDtrackerV1::AliTRDLeastSquare::RemovePoint(Double_t *x, Double_t y, Double_t sigmaY){
41702fec 3342 //
3343 // Remove Point from the sample
3344 //
3345 Double_t weight = 1/(sigmaY * sigmaY);
3346 Double_t &xpt = *x;
3347 fSums[0] -= weight;
3348 fSums[1] -= weight * xpt;
3349 fSums[2] -= weight * y;
3350 fSums[3] -= weight * xpt * y;
3351 fSums[4] -= weight * xpt * xpt;
3352 fSums[5] -= weight * y * y;
8acca6a3 3353}
3354
3355//_____________________________________________________________________________
3356void AliTRDtrackerV1::AliTRDLeastSquare::Eval(){
41702fec 3357 //
3358 // Evaluation of the fit:
3359 // Calculation of the parameters
3360 // Calculation of the covariance matrix
3361 //
3362
3363 Double_t denominator = fSums[0] * fSums[4] - fSums[1] *fSums[1];
aec26713 3364 if(denominator==0) return;
3365
41702fec 3366 // for(Int_t isum = 0; isum < 5; isum++)
3367 // printf("fSums[%d] = %f\n", isum, fSums[isum]);
3368 // printf("denominator = %f\n", denominator);
3369 fParams[0] = (fSums[2] * fSums[4] - fSums[1] * fSums[3])/ denominator;
3370 fParams[1] = (fSums[0] * fSums[3] - fSums[1] * fSums[2]) / denominator;
3371 // printf("fParams[0] = %f, fParams[1] = %f\n", fParams[0], fParams[1]);
3372
3373 // Covariance matrix
3374 fCovarianceMatrix[0] = fSums[4] - fSums[1] * fSums[1] / fSums[0];
3375 fCovarianceMatrix[1] = fSums[5] - fSums[2] * fSums[2] / fSums[0];
3376 fCovarianceMatrix[2] = fSums[3] - fSums[1] * fSums[2] / fSums[0];
8acca6a3 3377}
3378
46b6abd7 3379//_____________________________________________________________________________
3380Double_t AliTRDtrackerV1::AliTRDLeastSquare::GetFunctionValue(Double_t *xpos) const {
41702fec 3381 //
3382 // Returns the Function value of the fitted function at a given x-position
3383 //
3384 return fParams[0] + fParams[1] * (*xpos);
46b6abd7 3385}
3386
3387//_____________________________________________________________________________
3388void AliTRDtrackerV1::AliTRDLeastSquare::GetCovarianceMatrix(Double_t *storage) const {
41702fec 3389 //
3390 // Copies the values of the covariance matrix into the storage
3391 //
3392 memcpy(storage, fCovarianceMatrix, sizeof(Double_t) * 3);
46b6abd7 3393}
3394