- fix tilting pad correction in Attach and Fit tracklets
[u/mrichter/AliRoot.git] / TRD / AliTRDtrackerV1.cxx
CommitLineData
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;
175 Int_t ic = 0; do; while(!(cl = tracklet->GetClusters(ic++)));
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)) {
224f357f 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
541 // Get material budget
542 Double_t param[7];
543 AliTracker::MeanMaterialBudget(xyz0, xyz1, param);
544 Double_t xrho= param[0]*param[4];
545 Double_t xx0 = param[1]; // Get mean propagation parameters
546
547 // Propagate and update
548 t.PropagateTo(x, xx0, xrho);
549 if (!AdjustSector(&t)) break;
550
551 Double_t maxChi2 = t.GetPredictedChi2(tracklet);
552 if (maxChi2 < 1e+10 && t.Update(tracklet, maxChi2)){
553 nClustersExpected += tracklet->GetN();
554 }
555 }
556
3a039a31 557 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){
41702fec 558 Int_t index;
559 for(int iplane=0; iplane<6; iplane++){
560 AliTRDseedV1 *tracklet = GetTracklet(&t, iplane, index);
561 if(!tracklet) continue;
562 t.SetTracklet(tracklet, index);
563 }
564
565 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
566 TTreeSRedirector &cstreamer = *fgDebugStreamer;
567 cstreamer << "FollowProlongation"
568 << "EventNumber=" << eventNumber
569 << "ncl=" << nClustersExpected
570 //<< "track.=" << &t
571 << "\n";
572 }
573
574 return nClustersExpected;
0906e73e 575
576}
577
578//_____________________________________________________________________________
579Int_t AliTRDtrackerV1::FollowBackProlongation(AliTRDtrackV1 &t)
580{
41702fec 581 // Extrapolates the TRD track in the TOF direction.
582 //
583 // Parameters
584 // t : the TRD track which has to be extrapolated
585 //
586 // Output
587 // number of clusters attached to the track
588 //
589 // Detailed description
590 //
591 // Starting from current radial position of track <t> this function
592 // extrapolates the track through the 6 TRD layers. The following steps
593 // are being performed for each plane:
594 // 1. prepare track:
595 // a. get plane limits in the local x direction
596 // b. check crossing sectors
597 // c. check track inclination
598 // 2. build tracklet (see AliTRDseed::AttachClusters() for details)
599 // 3. evaluate material budget using the geo manager
600 // 4. propagate and update track using the tracklet information.
601 //
602 // Debug level 2
603 //
604
605 Int_t nClustersExpected = 0;
606 Double_t clength = AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick();
607 AliTRDtrackingChamber *chamber = 0x0;
608
3b57a3f7 609 AliTRDseedV1 tracklet, *ptrTracklet = 0x0;
181d2c97 610 // in case of stand alone tracking we store all the pointers to the tracklets in a temporary array
611 AliTRDseedV1 *tracklets[kNPlanes];
612 memset(tracklets, 0, sizeof(AliTRDseedV1 *) * kNPlanes);
613 for(Int_t ip = 0; ip < kNPlanes; ip++){
614 tracklets[ip] = t.GetTracklet(ip);
615 t.UnsetTracklet(ip);
616 }
3b57a3f7 617
053767a4 618 // Loop through the TRD layers
619 for (Int_t ilayer = 0; ilayer < AliTRDgeometry::Nlayer(); ilayer++) {
41702fec 620 // BUILD TRACKLET IF NOT ALREADY BUILT
621 Double_t x = 0., y, z, alpha;
181d2c97 622 ptrTracklet = tracklets[ilayer];
41702fec 623 if(!ptrTracklet){
053767a4 624 ptrTracklet = new(&tracklet) AliTRDseedV1(ilayer);
43d6ad34 625 ptrTracklet->SetReconstructor(fReconstructor);
41702fec 626 alpha = t.GetAlpha();
053767a4 627 Int_t sector = Int_t(alpha/AliTRDgeometry::GetAlpha() + (alpha>0. ? 0 : AliTRDgeometry::kNsector));
41702fec 628
629 if(!fTrSec[sector].GetNChambers()) continue;
630
053767a4 631 if((x = fTrSec[sector].GetX(ilayer)) < 1.) continue;
41702fec 632
43d6ad34 633 if (!t.GetProlongation(x, y, z)) return -nClustersExpected;
053767a4 634 Int_t stack = fGeom->GetStack(z, ilayer);
41702fec 635 Int_t nCandidates = stack >= 0 ? 1 : 2;
636 z -= stack >= 0 ? 0. : 4.;
637
638 for(int icham=0; icham<nCandidates; icham++, z+=8){
053767a4 639 if((stack = fGeom->GetStack(z, ilayer)) < 0) continue;
41702fec 640
053767a4 641 if(!(chamber = fTrSec[sector].GetChamber(stack, ilayer))) continue;
41702fec 642
3a039a31 643 if(chamber->GetNClusters() < fgNTimeBins*fReconstructor->GetRecoParam() ->GetFindableClusters()) continue;
41702fec 644
645 x = chamber->GetX();
646
053767a4 647 AliTRDpadPlane *pp = fGeom->GetPadPlane(ilayer, stack);
aec26713 648 tracklet.SetTilt(TMath::Tan(TMath::DegToRad()*pp->GetTiltingAngle()));
41702fec 649 tracklet.SetPadLength(pp->GetLengthIPad());
ae4e8b84 650 tracklet.SetDetector(chamber->GetDetector());
41702fec 651 tracklet.SetX0(x);
652 if(!tracklet.Init(&t)){
653 t.SetStopped(kTRUE);
654 return nClustersExpected;
655 }
656 if(!tracklet.AttachClustersIter(chamber, 1000.)) continue;
657 tracklet.Init(&t);
658
3a039a31 659 if(tracklet.GetN() < fgNTimeBins*fReconstructor->GetRecoParam() ->GetFindableClusters()) continue;
41702fec 660
661 break;
662 }
76b60503 663 //ptrTracklet->UseClusters();
41702fec 664 }
665 if(!ptrTracklet->IsOK()){
666 if(x < 1.) continue; //temporary
43d6ad34 667 if(!PropagateToX(t, x-fgkMaxStep, fgkMaxStep)) return -nClustersExpected;
668 if(!AdjustSector(&t)) return -nClustersExpected;
669 if(TMath::Abs(t.GetSnp()) > fgkMaxSnp) return -nClustersExpected;
41702fec 670 continue;
671 }
672
673 // Propagate closer to the current chamber if neccessary
674 x -= clength;
43d6ad34 675 if (x > (fgkMaxStep + t.GetX()) && !PropagateToX(t, x-fgkMaxStep, fgkMaxStep)) return -nClustersExpected;
676 if (!AdjustSector(&t)) return -nClustersExpected;
677 if (TMath::Abs(t.GetSnp()) > fgkMaxSnp) return -nClustersExpected;
41702fec 678
679 // load tracklet to the tracker and the track
680 ptrTracklet = SetTracklet(ptrTracklet);
681 t.SetTracklet(ptrTracklet, fTracklets->GetEntriesFast()-1);
682
683
684 // Calculate the mean material budget along the path inside the chamber
685 //Calculate global entry and exit positions of the track in chamber (only track prolongation)
686 Double_t xyz0[3]; // entry point
687 t.GetXYZ(xyz0);
688 alpha = t.GetAlpha();
689 x = ptrTracklet->GetX0();
43d6ad34 690 if (!t.GetProlongation(x, y, z)) return -nClustersExpected;
41702fec 691 Double_t xyz1[3]; // exit point
692 xyz1[0] = x * TMath::Cos(alpha) - y * TMath::Sin(alpha);
693 xyz1[1] = +x * TMath::Sin(alpha) + y * TMath::Cos(alpha);
694 xyz1[2] = z;
695 Double_t param[7];
696 AliTracker::MeanMaterialBudget(xyz0, xyz1, param);
697 // The mean propagation parameters
698 Double_t xrho = param[0]*param[4]; // density*length
699 Double_t xx0 = param[1]; // radiation length
700
701 // Propagate and update track
43d6ad34 702 if (!t.PropagateTo(x, xx0, xrho)) return -nClustersExpected;
703 if (!AdjustSector(&t)) return -nClustersExpected;
41702fec 704 Double_t maxChi2 = t.GetPredictedChi2(ptrTracklet);
43d6ad34 705 if (!t.Update(ptrTracklet, maxChi2)) return -nClustersExpected;
ae3fbe1f 706 if (maxChi2<1e+10) {
41702fec 707 nClustersExpected += ptrTracklet->GetN();
708 //t.SetTracklet(&tracklet, index);
709 }
710 // Reset material budget if 2 consecutive gold
053767a4 711 if(ilayer>0 && t.GetTracklet(ilayer-1) && ptrTracklet->GetN() + t.GetTracklet(ilayer-1)->GetN() > 20) t.SetBudget(2, 0.);
41702fec 712
713 // Make backup of the track until is gold
714 // TO DO update quality check of the track.
715 // consider comparison with fTimeBinsRange
716 Float_t ratio0 = ptrTracklet->GetN() / Float_t(fgNTimeBins);
717 //Float_t ratio1 = Float_t(t.GetNumberOfClusters()+1) / Float_t(t.GetNExpected()+1);
718 //printf("tracklet.GetChi2() %f [< 18.0]\n", tracklet.GetChi2());
719 //printf("ratio0 %f [> 0.8]\n", ratio0);
720 //printf("ratio1 %f [> 0.6]\n", ratio1);
721 //printf("ratio0+ratio1 %f [> 1.5]\n", ratio0+ratio1);
722 //printf("t.GetNCross() %d [== 0]\n", t.GetNCross());
723 //printf("TMath::Abs(t.GetSnp()) %f [< 0.85]\n", TMath::Abs(t.GetSnp()));
724 //printf("t.GetNumberOfClusters() %d [> 20]\n", t.GetNumberOfClusters());
725
726 if (//(tracklet.GetChi2() < 18.0) && TO DO check with FindClusters and move it to AliTRDseed::Update
727 (ratio0 > 0.8) &&
728 //(ratio1 > 0.6) &&
729 //(ratio0+ratio1 > 1.5) &&
730 (t.GetNCross() == 0) &&
731 (TMath::Abs(t.GetSnp()) < 0.85) &&
732 (t.GetNumberOfClusters() > 20)) t.MakeBackupTrack();
733
053767a4 734 } // end layers loop
41702fec 735
3a039a31 736 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){
41702fec 737 TTreeSRedirector &cstreamer = *fgDebugStreamer;
738 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
739 //AliTRDtrackV1 *debugTrack = new AliTRDtrackV1(t);
740 //debugTrack->SetOwner();
741 cstreamer << "FollowBackProlongation"
742 << "EventNumber=" << eventNumber
743 << "ncl=" << nClustersExpected
744 //<< "track.=" << debugTrack
745 << "\n";
746 }
747
748 return nClustersExpected;
0906e73e 749}
750
eb38ed55 751//_________________________________________________________________________
752Float_t AliTRDtrackerV1::FitRieman(AliTRDseedV1 *tracklets, Double_t *chi2, Int_t *planes){
41702fec 753 //
754 // Fits a Riemann-circle to the given points without tilting pad correction.
755 // The fit is performed using an instance of the class AliRieman (equations
756 // and transformations see documentation of this class)
757 // Afterwards all the tracklets are Updated
758 //
759 // Parameters: - Array of tracklets (AliTRDseedV1)
760 // - Storage for the chi2 values (beginning with direction z)
761 // - Seeding configuration
762 // Output: - The curvature
763 //
764 AliRieman *fitter = AliTRDtrackerV1::GetRiemanFitter();
765 fitter->Reset();
766 Int_t allplanes[] = {0, 1, 2, 3, 4, 5};
767 Int_t *ppl = &allplanes[0];
768 Int_t maxLayers = 6;
769 if(planes){
770 maxLayers = 4;
771 ppl = planes;
772 }
773 for(Int_t il = 0; il < maxLayers; il++){
774 if(!tracklets[ppl[il]].IsOK()) continue;
775 fitter->AddPoint(tracklets[ppl[il]].GetX0(), tracklets[ppl[il]].GetYfitR(0), tracklets[ppl[il]].GetZProb(),1,10);
776 }
777 fitter->Update();
778 // Set the reference position of the fit and calculate the chi2 values
779 memset(chi2, 0, sizeof(Double_t) * 2);
780 for(Int_t il = 0; il < maxLayers; il++){
781 // Reference positions
782 tracklets[ppl[il]].Init(fitter);
783
784 // chi2
785 if((!tracklets[ppl[il]].IsOK()) && (!planes)) continue;
786 chi2[0] += tracklets[ppl[il]].GetChi2Y();
787 chi2[1] += tracklets[ppl[il]].GetChi2Z();
788 }
789 return fitter->GetC();
eb38ed55 790}
791
792//_________________________________________________________________________
793void AliTRDtrackerV1::FitRieman(AliTRDcluster **seedcl, Double_t chi2[2])
794{
41702fec 795 //
796 // Performs a Riemann helix fit using the seedclusters as spacepoints
797 // Afterwards the chi2 values are calculated and the seeds are updated
798 //
799 // Parameters: - The four seedclusters
800 // - The tracklet array (AliTRDseedV1)
801 // - The seeding configuration
802 // - Chi2 array
803 //
804 // debug level 2
805 //
806 AliRieman *fitter = AliTRDtrackerV1::GetRiemanFitter();
807 fitter->Reset();
808 for(Int_t i = 0; i < 4; i++)
809 fitter->AddPoint(seedcl[i]->GetX(), seedcl[i]->GetY(), seedcl[i]->GetZ(), 1, 10);
810 fitter->Update();
811
812
813 // Update the seed and calculated the chi2 value
814 chi2[0] = 0; chi2[1] = 0;
815 for(Int_t ipl = 0; ipl < kNSeedPlanes; ipl++){
816 // chi2
817 chi2[0] += (seedcl[ipl]->GetZ() - fitter->GetZat(seedcl[ipl]->GetX())) * (seedcl[ipl]->GetZ() - fitter->GetZat(seedcl[ipl]->GetX()));
818 chi2[1] += (seedcl[ipl]->GetY() - fitter->GetYat(seedcl[ipl]->GetX())) * (seedcl[ipl]->GetY() - fitter->GetYat(seedcl[ipl]->GetX()));
819 }
eb38ed55 820}
821
822
823//_________________________________________________________________________
824Float_t AliTRDtrackerV1::FitTiltedRiemanConstraint(AliTRDseedV1 *tracklets, Double_t zVertex)
825{
41702fec 826 //
827 // Fits a helix to the clusters. Pad tilting is considered. As constraint it is
828 // assumed that the vertex position is set to 0.
829 // This method is very usefull for high-pt particles
830 // Basis for the fit: (x - x0)^2 + (y - y0)^2 - R^2 = 0
831 // x0, y0: Center of the circle
832 // Measured y-position: ymeas = y - tan(phiT)(zc - zt)
833 // zc: center of the pad row
834 // Equation which has to be fitted (after transformation):
835 // a + b * u + e * v + 2*(ymeas + tan(phiT)(z - zVertex))*t = 0
836 // Transformation:
837 // t = 1/(x^2 + y^2)
838 // u = 2 * x * t
839 // v = 2 * x * tan(phiT) * t
840 // Parameters in the equation:
841 // a = -1/y0, b = x0/y0, e = dz/dx
842 //
843 // The Curvature is calculated by the following equation:
844 // - curv = a/Sqrt(b^2 + 1) = 1/R
845 // Parameters: - the 6 tracklets
846 // - the Vertex constraint
847 // Output: - the Chi2 value of the track
848 //
849 // debug level 5
850 //
851
852 TLinearFitter *fitter = GetTiltedRiemanFitterConstraint();
853 fitter->StoreData(kTRUE);
854 fitter->ClearPoints();
855 AliTRDcluster *cl = 0x0;
856
857 Float_t x, y, z, w, t, error, tilt;
858 Double_t uvt[2];
859 Int_t nPoints = 0;
053767a4 860 for(Int_t ilr = 0; ilr < AliTRDgeometry::kNlayer; ilr++){
861 if(!tracklets[ilr].IsOK()) continue;
41702fec 862 for(Int_t itb = 0; itb < fgNTimeBins; itb++){
053767a4 863 if(!tracklets[ilr].IsUsable(itb)) continue;
864 cl = tracklets[ilr].GetClusters(itb);
41702fec 865 x = cl->GetX();
866 y = cl->GetY();
867 z = cl->GetZ();
053767a4 868 tilt = tracklets[ilr].GetTilt();
41702fec 869 // Transformation
870 t = 1./(x * x + y * y);
871 uvt[0] = 2. * x * t;
872 uvt[1] = 2. * x * t * tilt ;
873 w = 2. * (y + tilt * (z - zVertex)) * t;
874 error = 2. * 0.2 * t;
875 fitter->AddPoint(uvt, w, error);
876 nPoints++;
877 }
878 }
879 fitter->Eval();
880
881 // Calculate curvature
882 Double_t a = fitter->GetParameter(0);
883 Double_t b = fitter->GetParameter(1);
884 Double_t curvature = a/TMath::Sqrt(b*b + 1);
885
886 Float_t chi2track = fitter->GetChisquare()/Double_t(nPoints);
887 for(Int_t ip = 0; ip < AliTRDtrackerV1::kNPlanes; ip++)
888 tracklets[ip].SetCC(curvature);
889
3a039a31 890/* if(fReconstructor->GetStreamLevel() >= 5){
41702fec 891 //Linear Model on z-direction
892 Double_t xref = CalculateReferenceX(tracklets); // Relative to the middle of the stack
893 Double_t slope = fitter->GetParameter(2);
894 Double_t zref = slope * xref;
895 Float_t chi2Z = CalculateChi2Z(tracklets, zref, slope, xref);
896 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
897 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
898 TTreeSRedirector &treeStreamer = *fgDebugStreamer;
899 treeStreamer << "FitTiltedRiemanConstraint"
900 << "EventNumber=" << eventNumber
901 << "CandidateNumber=" << candidateNumber
902 << "Curvature=" << curvature
903 << "Chi2Track=" << chi2track
904 << "Chi2Z=" << chi2Z
905 << "zref=" << zref
906 << "\n";
3a039a31 907 }*/
41702fec 908 return chi2track;
eb38ed55 909}
910
911//_________________________________________________________________________
912Float_t AliTRDtrackerV1::FitTiltedRieman(AliTRDseedV1 *tracklets, Bool_t sigError)
913{
41702fec 914 //
915 // Performs a Riemann fit taking tilting pad correction into account
916 // The equation of a Riemann circle, where the y position is substituted by the
917 // measured y-position taking pad tilting into account, has to be transformed
918 // into a 4-dimensional hyperplane equation
919 // Riemann circle: (x-x0)^2 + (y-y0)^2 -R^2 = 0
920 // Measured y-Position: ymeas = y - tan(phiT)(zc - zt)
921 // zc: center of the pad row
922 // zt: z-position of the track
923 // The z-position of the track is assumed to be linear dependent on the x-position
924 // Transformed equation: a + b * u + c * t + d * v + e * w - 2 * (ymeas + tan(phiT) * zc) * t = 0
925 // Transformation: u = 2 * x * t
926 // v = 2 * tan(phiT) * t
927 // w = 2 * tan(phiT) * (x - xref) * t
928 // t = 1 / (x^2 + ymeas^2)
929 // Parameters: a = -1/y0
930 // b = x0/y0
931 // c = (R^2 -x0^2 - y0^2)/y0
932 // d = offset
933 // e = dz/dx
934 // If the offset respectively the slope in z-position is impossible, the parameters are fixed using
935 // results from the simple riemann fit. Afterwards the fit is redone.
936 // The curvature is calculated according to the formula:
937 // curv = a/(1 + b^2 + c*a) = 1/R
938 //
939 // Paramters: - Array of tracklets (connected to the track candidate)
940 // - Flag selecting the error definition
941 // Output: - Chi2 values of the track (in Parameter list)
942 //
943 TLinearFitter *fitter = GetTiltedRiemanFitter();
944 fitter->StoreData(kTRUE);
945 fitter->ClearPoints();
946 AliTRDLeastSquare zfitter;
947 AliTRDcluster *cl = 0x0;
948
949 Double_t xref = CalculateReferenceX(tracklets);
950 Double_t x, y, z, t, tilt, dx, w, we;
951 Double_t uvt[4];
952 Int_t nPoints = 0;
953 // Containers for Least-square fitter
954 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
955 if(!tracklets[ipl].IsOK()) continue;
956 for(Int_t itb = 0; itb < fgNTimeBins; itb++){
957 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
958 if (!tracklets[ipl].IsUsable(itb)) continue;
959 x = cl->GetX();
960 y = cl->GetY();
961 z = cl->GetZ();
962 tilt = tracklets[ipl].GetTilt();
963 dx = x - xref;
964 // Transformation
965 t = 1./(x*x + y*y);
966 uvt[0] = 2. * x * t;
967 uvt[1] = t;
968 uvt[2] = 2. * tilt * t;
969 uvt[3] = 2. * tilt * dx * t;
970 w = 2. * (y + tilt*z) * t;
971 // error definition changes for the different calls
972 we = 2. * t;
973 we *= sigError ? tracklets[ipl].GetSigmaY() : 0.2;
974 fitter->AddPoint(uvt, w, we);
975 zfitter.AddPoint(&x, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
976 nPoints++;
977 }
978 }
979 fitter->Eval();
980 zfitter.Eval();
981
982 Double_t offset = fitter->GetParameter(3);
983 Double_t slope = fitter->GetParameter(4);
984
985 // Linear fitter - not possible to make boundaries
986 // Do not accept non possible z and dzdx combinations
987 Bool_t acceptablez = kTRUE;
988 Double_t zref = 0.0;
989 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
990 if(!tracklets[iLayer].IsOK()) continue;
991 zref = offset + slope * (tracklets[iLayer].GetX0() - xref);
992 if (TMath::Abs(tracklets[iLayer].GetZProb() - zref) > tracklets[iLayer].GetPadLength() * 0.5 + 1.0)
993 acceptablez = kFALSE;
994 }
995 if (!acceptablez) {
996 Double_t dzmf = zfitter.GetFunctionParameter(1);
997 Double_t zmf = zfitter.GetFunctionValue(&xref);
998 fgTiltedRieman->FixParameter(3, zmf);
999 fgTiltedRieman->FixParameter(4, dzmf);
1000 fitter->Eval();
1001 fitter->ReleaseParameter(3);
1002 fitter->ReleaseParameter(4);
1003 offset = fitter->GetParameter(3);
1004 slope = fitter->GetParameter(4);
1005 }
1006
1007 // Calculate Curvarture
1008 Double_t a = fitter->GetParameter(0);
1009 Double_t b = fitter->GetParameter(1);
1010 Double_t c = fitter->GetParameter(2);
1011 Double_t curvature = 1.0 + b*b - c*a;
1012 if (curvature > 0.0)
1013 curvature = a / TMath::Sqrt(curvature);
1014
1015 Double_t chi2track = fitter->GetChisquare()/Double_t(nPoints);
1016
1017 // Update the tracklets
1018 Double_t dy, dz;
1019 for(Int_t iLayer = 0; iLayer < AliTRDtrackerV1::kNPlanes; iLayer++) {
1020
1021 x = tracklets[iLayer].GetX0();
1022 y = 0;
1023 z = 0;
1024 dy = 0;
1025 dz = 0;
1026
1027 // y: R^2 = (x - x0)^2 + (y - y0)^2
1028 // => y = y0 +/- Sqrt(R^2 - (x - x0)^2)
1029 // R = Sqrt() = 1/Curvature
1030 // => y = y0 +/- Sqrt(1/Curvature^2 - (x - x0)^2)
1031 Double_t res = (x * a + b); // = (x - x0)/y0
1032 res *= res;
1033 res = 1.0 - c * a + b * b - res; // = (R^2 - (x - x0)^2)/y0^2
1034 if (res >= 0) {
1035 res = TMath::Sqrt(res);
1036 y = (1.0 - res) / a;
1037 }
1038
1039 // dy: R^2 = (x - x0)^2 + (y - y0)^2
1040 // => y = +/- Sqrt(R^2 - (x - x0)^2) + y0
1041 // => dy/dx = (x - x0)/Sqrt(R^2 - (x - x0)^2)
1042 // Curvature: cr = 1/R = a/Sqrt(1 + b^2 - c*a)
1043 // => dy/dx = (x - x0)/(1/(cr^2) - (x - x0)^2)
1044 Double_t x0 = -b / a;
1045 if (-c * a + b * b + 1 > 0) {
1046 if (1.0/(curvature * curvature) - (x - x0) * (x - x0) > 0.0) {
1047 Double_t yderiv = (x - x0) / TMath::Sqrt(1.0/(curvature * curvature) - (x - x0) * (x - x0));
1048 if (a < 0) yderiv *= -1.0;
1049 dy = yderiv;
1050 }
1051 }
1052 z = offset + slope * (x - xref);
1053 dz = slope;
1054 tracklets[iLayer].SetYref(0, y);
1055 tracklets[iLayer].SetYref(1, dy);
1056 tracklets[iLayer].SetZref(0, z);
1057 tracklets[iLayer].SetZref(1, dz);
1058 tracklets[iLayer].SetC(curvature);
1059 tracklets[iLayer].SetChi2(chi2track);
1060 }
1061
3a039a31 1062/* if(fReconstructor->GetStreamLevel() >=5){
41702fec 1063 TTreeSRedirector &cstreamer = *fgDebugStreamer;
1064 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
1065 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
1066 Double_t chi2z = CalculateChi2Z(tracklets, offset, slope, xref);
1067 cstreamer << "FitTiltedRieman0"
1068 << "EventNumber=" << eventNumber
1069 << "CandidateNumber=" << candidateNumber
1070 << "xref=" << xref
1071 << "Chi2Z=" << chi2z
1072 << "\n";
3a039a31 1073 }*/
41702fec 1074 return chi2track;
eb38ed55 1075}
1076
3b57a3f7 1077
9e333711 1078//____________________________________________________________________
1079Double_t AliTRDtrackerV1::FitLine(AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t err, Int_t np, AliTrackPoint *points)
1080{
1081 AliTRDLeastSquare yfitter, zfitter;
1082 AliTRDcluster *cl = 0x0;
1083
1084 AliTRDseedV1 work[kNPlanes], *tracklet = 0x0;
1085 if(!tracklets){
1086 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1087 if(!(tracklet = track->GetTracklet(ipl))) continue;
1088 if(!tracklet->IsOK()) continue;
1089 new(&work[ipl]) AliTRDseedV1(*tracklet);
1090 }
1091 tracklets = &work[0];
1092 }
1093
1094 Double_t xref = CalculateReferenceX(tracklets);
1095 Double_t x, y, z, dx, ye, yr, tilt;
1096 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1097 if(!tracklets[ipl].IsOK()) continue;
1098 for(Int_t itb = 0; itb < fgNTimeBins; itb++){
1099 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1100 if (!tracklets[ipl].IsUsable(itb)) continue;
1101 x = cl->GetX();
1102 z = cl->GetZ();
1103 dx = x - xref;
1104 zfitter.AddPoint(&dx, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
1105 }
1106 }
1107 zfitter.Eval();
1108 Double_t z0 = zfitter.GetFunctionParameter(0);
1109 Double_t dzdx = zfitter.GetFunctionParameter(1);
1110 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1111 if(!tracklets[ipl].IsOK()) continue;
1112 for(Int_t itb = 0; itb < fgNTimeBins; itb++){
1113 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1114 if (!tracklets[ipl].IsUsable(itb)) continue;
1115 x = cl->GetX();
1116 y = cl->GetY();
1117 z = cl->GetZ();
1118 tilt = tracklets[ipl].GetTilt();
1119 dx = x - xref;
1120 yr = y + tilt*(z - z0 - dzdx*dx);
1121 // error definition changes for the different calls
1122 ye = tilt*TMath::Sqrt(cl->GetSigmaZ2());
1123 ye += err ? tracklets[ipl].GetSigmaY() : 0.2;
1124 yfitter.AddPoint(&dx, yr, ye);
1125 }
1126 }
1127 yfitter.Eval();
1128 Double_t y0 = yfitter.GetFunctionParameter(0);
1129 Double_t dydx = yfitter.GetFunctionParameter(1);
1130 Double_t chi2 = 0.;//yfitter.GetChisquare()/Double_t(nPoints);
1131
1132 //update track points array
1133 if(np && points){
1134 Float_t xyz[3];
1135 for(int ip=0; ip<np; ip++){
1136 points[ip].GetXYZ(xyz);
1137 xyz[1] = y0 + dydx * (xyz[0] - xref);
1138 xyz[2] = z0 + dzdx * (xyz[0] - xref);
1139 points[ip].SetXYZ(xyz);
1140 }
1141 }
1142 return chi2;
1143}
1144
1145
3b57a3f7 1146//_________________________________________________________________________
1147Double_t AliTRDtrackerV1::FitRiemanTilt(AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t sigError, Int_t np, AliTrackPoint *points)
1148{
41702fec 1149 //
1150 // Performs a Riemann fit taking tilting pad correction into account
1151 // The equation of a Riemann circle, where the y position is substituted by the
1152 // measured y-position taking pad tilting into account, has to be transformed
1153 // into a 4-dimensional hyperplane equation
1154 // Riemann circle: (x-x0)^2 + (y-y0)^2 -R^2 = 0
1155 // Measured y-Position: ymeas = y - tan(phiT)(zc - zt)
1156 // zc: center of the pad row
1157 // zt: z-position of the track
1158 // The z-position of the track is assumed to be linear dependent on the x-position
1159 // Transformed equation: a + b * u + c * t + d * v + e * w - 2 * (ymeas + tan(phiT) * zc) * t = 0
1160 // Transformation: u = 2 * x * t
1161 // v = 2 * tan(phiT) * t
1162 // w = 2 * tan(phiT) * (x - xref) * t
1163 // t = 1 / (x^2 + ymeas^2)
1164 // Parameters: a = -1/y0
1165 // b = x0/y0
1166 // c = (R^2 -x0^2 - y0^2)/y0
1167 // d = offset
1168 // e = dz/dx
1169 // If the offset respectively the slope in z-position is impossible, the parameters are fixed using
1170 // results from the simple riemann fit. Afterwards the fit is redone.
1171 // The curvature is calculated according to the formula:
1172 // curv = a/(1 + b^2 + c*a) = 1/R
1173 //
1174 // Paramters: - Array of tracklets (connected to the track candidate)
1175 // - Flag selecting the error definition
1176 // Output: - Chi2 values of the track (in Parameter list)
1177 //
1178 TLinearFitter *fitter = GetTiltedRiemanFitter();
1179 fitter->StoreData(kTRUE);
1180 fitter->ClearPoints();
1181 AliTRDLeastSquare zfitter;
1182 AliTRDcluster *cl = 0x0;
3b57a3f7 1183
1184 AliTRDseedV1 work[kNPlanes], *tracklet = 0x0;
1185 if(!tracklets){
1186 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1187 if(!(tracklet = track->GetTracklet(ipl))) continue;
1188 if(!tracklet->IsOK()) continue;
1189 new(&work[ipl]) AliTRDseedV1(*tracklet);
1190 }
1191 tracklets = &work[0];
1192 }
1193
41702fec 1194 Double_t xref = CalculateReferenceX(tracklets);
1195 Double_t x, y, z, t, tilt, dx, w, we;
1196 Double_t uvt[4];
1197 Int_t nPoints = 0;
1198 // Containers for Least-square fitter
1199 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1200 if(!tracklets[ipl].IsOK()) continue;
1201 for(Int_t itb = 0; itb < fgNTimeBins; itb++){
1202 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1203 if (!tracklets[ipl].IsUsable(itb)) continue;
1204 x = cl->GetX();
1205 y = cl->GetY();
1206 z = cl->GetZ();
1207 tilt = tracklets[ipl].GetTilt();
1208 dx = x - xref;
1209 // Transformation
1210 t = 1./(x*x + y*y);
1211 uvt[0] = 2. * x * t;
1212 uvt[1] = t;
1213 uvt[2] = 2. * tilt * t;
1214 uvt[3] = 2. * tilt * dx * t;
1215 w = 2. * (y + tilt*z) * t;
1216 // error definition changes for the different calls
1217 we = 2. * t;
1218 we *= sigError ? tracklets[ipl].GetSigmaY() : 0.2;
1219 fitter->AddPoint(uvt, w, we);
1220 zfitter.AddPoint(&x, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
1221 nPoints++;
1222 }
1223 }
aec26713 1224 if(fitter->Eval()) return 1.E10;
1225
41702fec 1226 Double_t z0 = fitter->GetParameter(3);
1227 Double_t dzdx = fitter->GetParameter(4);
3b57a3f7 1228
1229
1230 // Linear fitter - not possible to make boundaries
1231 // Do not accept non possible z and dzdx combinations
1232 Bool_t accept = kTRUE;
1233 Double_t zref = 0.0;
1234 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
1235 if(!tracklets[iLayer].IsOK()) continue;
1236 zref = z0 + dzdx * (tracklets[iLayer].GetX0() - xref);
1237 if (TMath::Abs(tracklets[iLayer].GetZProb() - zref) > tracklets[iLayer].GetPadLength() * 0.5 + 1.0)
1238 accept = kFALSE;
1239 }
1240 if (!accept) {
41702fec 1241 zfitter.Eval();
3b57a3f7 1242 Double_t dzmf = zfitter.GetFunctionParameter(1);
1243 Double_t zmf = zfitter.GetFunctionValue(&xref);
1244 fitter->FixParameter(3, zmf);
1245 fitter->FixParameter(4, dzmf);
1246 fitter->Eval();
1247 fitter->ReleaseParameter(3);
1248 fitter->ReleaseParameter(4);
1249 z0 = fitter->GetParameter(3); // = zmf ?
1250 dzdx = fitter->GetParameter(4); // = dzmf ?
1251 }
1252
1253 // Calculate Curvature
1254 Double_t a = fitter->GetParameter(0);
1255 Double_t b = fitter->GetParameter(1);
1256 Double_t c = fitter->GetParameter(2);
1257 Double_t y0 = 1. / a;
1258 Double_t x0 = -b * y0;
1259 Double_t R = TMath::Sqrt(y0*y0 + x0*x0 - c*y0);
1260 Double_t C = 1.0 + b*b - c*a;
1261 if (C > 0.0) C = a / TMath::Sqrt(C);
1262
1263 // Calculate chi2 of the fit
1264 Double_t chi2 = fitter->GetChisquare()/Double_t(nPoints);
1265
1266 // Update the tracklets
1267 if(!track){
1268 for(Int_t ip = 0; ip < kNPlanes; ip++) {
1269 x = tracklets[ip].GetX0();
1270 Double_t tmp = TMath::Sqrt(R*R-(x-x0)*(x-x0));
1271
1272 // y: R^2 = (x - x0)^2 + (y - y0)^2
1273 // => y = y0 +/- Sqrt(R^2 - (x - x0)^2)
1274 tracklets[ip].SetYref(0, y0 - (y0>0.?1.:-1)*tmp);
1275 // => dy/dx = (x - x0)/Sqrt(R^2 - (x - x0)^2)
1276 tracklets[ip].SetYref(1, (x - x0) / tmp);
1277 tracklets[ip].SetZref(0, z0 + dzdx * (x - xref));
1278 tracklets[ip].SetZref(1, dzdx);
1279 tracklets[ip].SetC(C);
1280 tracklets[ip].SetChi2(chi2);
1281 }
1282 }
1283
1284 //update track points array
1285 if(np && points){
1286 Float_t xyz[3];
1287 for(int ip=0; ip<np; ip++){
1288 points[ip].GetXYZ(xyz);
1289 xyz[1] = y0 - (y0>0.?1.:-1)*TMath::Sqrt(R*R-(xyz[0]-x0)*(xyz[0]-x0));
1290 xyz[2] = z0 + dzdx * (xyz[0] - xref);
1291 points[ip].SetXYZ(xyz);
1292 }
1293 }
1294
3a039a31 1295/* if(fReconstructor->GetStreamLevel() >=5){
3b57a3f7 1296 TTreeSRedirector &cstreamer = *fgDebugStreamer;
1297 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
1298 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
1299 Double_t chi2z = CalculateChi2Z(tracklets, z0, dzdx, xref);
1300 cstreamer << "FitRiemanTilt"
1301 << "EventNumber=" << eventNumber
1302 << "CandidateNumber=" << candidateNumber
1303 << "xref=" << xref
1304 << "Chi2Z=" << chi2z
1305 << "\n";
3a039a31 1306 }*/
3b57a3f7 1307 return chi2;
1308}
1309
1310
1bf51039 1311//____________________________________________________________________
1312Double_t AliTRDtrackerV1::FitKalman(AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t up, Int_t np, AliTrackPoint *points)
1313{
1314// Kalman filter implementation for the TRD.
1315// It returns the positions of the fit in the array "points"
1316//
1317// Author : A.Bercuci@gsi.de
1318
1319 //printf("Start track @ x[%f]\n", track->GetX());
1320
1321 //prepare marker points along the track
1322 Int_t ip = np ? 0 : 1;
1323 while(ip<np){
1324 if((up?-1:1) * (track->GetX() - points[ip].GetX()) > 0.) break;
1325 //printf("AliTRDtrackerV1::FitKalman() : Skip track marker x[%d] = %7.3f. Before track start ( %7.3f ).\n", ip, points[ip].GetX(), track->GetX());
1326 ip++;
1327 }
1328 //if(points) printf("First marker point @ x[%d] = %f\n", ip, points[ip].GetX());
1329
1330
1331 AliTRDseedV1 tracklet, *ptrTracklet = 0x0;
1332
1333 //Loop through the TRD planes
1334 for (Int_t jplane = 0; jplane < kNPlanes; jplane++) {
1335 // GET TRACKLET OR BUILT IT
1336 Int_t iplane = up ? jplane : kNPlanes - 1 - jplane;
1337 if(tracklets){
1338 if(!(ptrTracklet = &tracklets[iplane])) continue;
1339 }else{
1340 if(!(ptrTracklet = track->GetTracklet(iplane))){
1341 /*AliTRDtrackerV1 *tracker = 0x0;
1342 if(!(tracker = dynamic_cast<AliTRDtrackerV1*>( AliTRDReconstructor::Tracker()))) continue;
1343 ptrTracklet = new(&tracklet) AliTRDseedV1(iplane);
1344 if(!tracker->MakeTracklet(ptrTracklet, track)) */
1345 continue;
1346 }
1347 }
1348 if(!ptrTracklet->IsOK()) continue;
1349
1350 Double_t x = ptrTracklet->GetX0();
1351
1352 while(ip < np){
1353 //don't do anything if next marker is after next update point.
1354 if((up?-1:1) * (points[ip].GetX() - x) - fgkMaxStep < 0) break;
1355
1356 //printf("Propagate to x[%d] = %f\n", ip, points[ip].GetX());
1357
1358 if(((up?-1:1) * (points[ip].GetX() - track->GetX()) < 0) && !PropagateToX(*track, points[ip].GetX(), fgkMaxStep)) return -1.;
1359
1360 Double_t xyz[3]; // should also get the covariance
1361 track->GetXYZ(xyz); points[ip].SetXYZ(xyz[0], xyz[1], xyz[2]);
1362 ip++;
1363 }
1364 //printf("plane[%d] tracklet[%p] x[%f]\n", iplane, ptrTracklet, x);
1365
1366 //Propagate closer to the next update point
1367 if(((up?-1:1) * (x - track->GetX()) + fgkMaxStep < 0) && !PropagateToX(*track, x + (up?-1:1)*fgkMaxStep, fgkMaxStep)) return -1.;
1368
1369 if(!AdjustSector(track)) return -1;
1370 if(TMath::Abs(track->GetSnp()) > fgkMaxSnp) return -1;
1371
1372 //load tracklet to the tracker and the track
1373/* Int_t index;
1374 if((index = FindTracklet(ptrTracklet)) < 0){
1375 ptrTracklet = SetTracklet(&tracklet);
1376 index = fTracklets->GetEntriesFast()-1;
1377 }
1378 track->SetTracklet(ptrTracklet, index);*/
1379
1380
1381 // register tracklet to track with tracklet creation !!
1382 // PropagateBack : loaded tracklet to the tracker and update index
1383 // RefitInward : update index
1384 // MakeTrack : loaded tracklet to the tracker and update index
1385 if(!tracklets) track->SetTracklet(ptrTracklet, -1);
1386
1387
1388 //Calculate the mean material budget along the path inside the chamber
1389 Double_t xyz0[3]; track->GetXYZ(xyz0);
1390 Double_t alpha = track->GetAlpha();
1391 Double_t xyz1[3], y, z;
1392 if(!track->GetProlongation(x, y, z)) return -1;
1393 xyz1[0] = x * TMath::Cos(alpha) - y * TMath::Sin(alpha);
1394 xyz1[1] = +x * TMath::Sin(alpha) + y * TMath::Cos(alpha);
1395 xyz1[2] = z;
1396 Double_t param[7];
1397 AliTracker::MeanMaterialBudget(xyz0, xyz1, param);
1398 Double_t xrho = param[0]*param[4]; // density*length
1399 Double_t xx0 = param[1]; // radiation length
1400
1401 //Propagate the track
1402 track->PropagateTo(x, xx0, xrho);
1403 if (!AdjustSector(track)) break;
1404
1405 //Update track
1406 Double_t chi2 = track->GetPredictedChi2(ptrTracklet);
1407 if(chi2<1e+10) track->Update(ptrTracklet, chi2);
1408
1409 if(!up) continue;
1410
1411 //Reset material budget if 2 consecutive gold
1412 if(iplane>0 && track->GetTracklet(iplane-1) && ptrTracklet->GetN() + track->GetTracklet(iplane-1)->GetN() > 20) track->SetBudget(2, 0.);
1413 } // end planes loop
1414
1415 // extrapolation
1416 while(ip < np){
1417 if(((up?-1:1) * (points[ip].GetX() - track->GetX()) < 0) && !PropagateToX(*track, points[ip].GetX(), fgkMaxStep)) return -1.;
1418
1419 Double_t xyz[3]; // should also get the covariance
1420 track->GetXYZ(xyz); points[ip].SetXYZ(xyz[0], xyz[1], xyz[2]);
1421 ip++;
1422 }
1423
1424 return track->GetChi2();
1425}
3b57a3f7 1426
eb38ed55 1427//_________________________________________________________________________
bb56afff 1428Float_t AliTRDtrackerV1::CalculateChi2Z(AliTRDseedV1 *tracklets, Double_t offset, Double_t slope, Double_t xref)
eb38ed55 1429{
41702fec 1430 //
1431 // Calculates the chi2-value of the track in z-Direction including tilting pad correction.
1432 // A linear dependence on the x-value serves as a model.
1433 // The parameters are related to the tilted Riemann fit.
1434 // Parameters: - Array of tracklets (AliTRDseedV1) related to the track candidate
1435 // - the offset for the reference x
1436 // - the slope
1437 // - the reference x position
1438 // Output: - The Chi2 value of the track in z-Direction
1439 //
1440 Float_t chi2Z = 0, nLayers = 0;
053767a4 1441 for (Int_t iLayer = 0; iLayer < AliTRDgeometry::kNlayer; iLayer++) {
41702fec 1442 if(!tracklets[iLayer].IsOK()) continue;
1443 Double_t z = offset + slope * (tracklets[iLayer].GetX0() - xref);
1444 chi2Z += TMath::Abs(tracklets[iLayer].GetMeanz() - z);
1445 nLayers++;
1446 }
1447 chi2Z /= TMath::Max((nLayers - 3.0),1.0);
1448 return chi2Z;
eb38ed55 1449}
1450
bccda319 1451//_____________________________________________________________________________
1452Int_t AliTRDtrackerV1::PropagateToX(AliTRDtrackV1 &t, Double_t xToGo, Double_t maxStep)
1453{
41702fec 1454 //
1455 // Starting from current X-position of track <t> this function
1456 // extrapolates the track up to radial position <xToGo>.
1457 // Returns 1 if track reaches the plane, and 0 otherwise
1458 //
bccda319 1459
41702fec 1460 const Double_t kEpsilon = 0.00001;
bccda319 1461
41702fec 1462 // Current track X-position
1463 Double_t xpos = t.GetX();
bccda319 1464
41702fec 1465 // Direction: inward or outward
1466 Double_t dir = (xpos < xToGo) ? 1.0 : -1.0;
bccda319 1467
41702fec 1468 while (((xToGo - xpos) * dir) > kEpsilon) {
bccda319 1469
41702fec 1470 Double_t xyz0[3];
1471 Double_t xyz1[3];
1472 Double_t param[7];
1473 Double_t x;
1474 Double_t y;
1475 Double_t z;
bccda319 1476
41702fec 1477 // The next step size
1478 Double_t step = dir * TMath::Min(TMath::Abs(xToGo-xpos),maxStep);
bccda319 1479
41702fec 1480 // Get the global position of the starting point
1481 t.GetXYZ(xyz0);
bccda319 1482
41702fec 1483 // X-position after next step
1484 x = xpos + step;
bccda319 1485
41702fec 1486 // Get local Y and Z at the X-position of the next step
1487 if (!t.GetProlongation(x,y,z)) {
1488 return 0; // No prolongation possible
1489 }
bccda319 1490
41702fec 1491 // The global position of the end point of this prolongation step
1492 xyz1[0] = x * TMath::Cos(t.GetAlpha()) - y * TMath::Sin(t.GetAlpha());
1493 xyz1[1] = +x * TMath::Sin(t.GetAlpha()) + y * TMath::Cos(t.GetAlpha());
1494 xyz1[2] = z;
bccda319 1495
41702fec 1496 // Calculate the mean material budget between start and
1497 // end point of this prolongation step
1498 AliTracker::MeanMaterialBudget(xyz0, xyz1, param);
bccda319 1499
41702fec 1500 // Propagate the track to the X-position after the next step
1501 if (!t.PropagateTo(x,param[1],param[0]*param[4])) {
1502 return 0;
1503 }
bccda319 1504
41702fec 1505 // Rotate the track if necessary
1506 AdjustSector(&t);
bccda319 1507
41702fec 1508 // New track X-position
1509 xpos = t.GetX();
bccda319 1510
41702fec 1511 }
bccda319 1512
41702fec 1513 return 1;
bccda319 1514
1515}
1516
eb38ed55 1517
1518//_____________________________________________________________________________
1519Int_t AliTRDtrackerV1::ReadClusters(TClonesArray* &array, TTree *clusterTree) const
1520{
41702fec 1521 //
1522 // Reads AliTRDclusters from the file.
1523 // The names of the cluster tree and branches
1524 // should match the ones used in AliTRDclusterizer::WriteClusters()
1525 //
1526
1527 Int_t nsize = Int_t(clusterTree->GetTotBytes() / (sizeof(AliTRDcluster)));
1528 TObjArray *clusterArray = new TObjArray(nsize+1000);
1529
1530 TBranch *branch = clusterTree->GetBranch("TRDcluster");
1531 if (!branch) {
1532 AliError("Can't get the branch !");
1533 return 1;
1534 }
1535 branch->SetAddress(&clusterArray);
1536
1537 if(!fClusters){
8ae98148 1538 Float_t nclusters = fReconstructor->GetRecoParam()->GetNClusters();
1539 if(fReconstructor->IsHLT()) nclusters /= AliTRDgeometry::kNsector;
1540 array = new TClonesArray("AliTRDcluster", Int_t(nclusters));
41702fec 1541 array->SetOwner(kTRUE);
1542 }
1543
1544 // Loop through all entries in the tree
1545 Int_t nEntries = (Int_t) clusterTree->GetEntries();
1546 Int_t nbytes = 0;
1547 Int_t ncl = 0;
1548 AliTRDcluster *c = 0x0;
1549 for (Int_t iEntry = 0; iEntry < nEntries; iEntry++) {
1550 // Import the tree
1551 nbytes += clusterTree->GetEvent(iEntry);
1552
1553 // Get the number of points in the detector
1554 Int_t nCluster = clusterArray->GetEntriesFast();
1555 for (Int_t iCluster = 0; iCluster < nCluster; iCluster++) {
1556 if(!(c = (AliTRDcluster *) clusterArray->UncheckedAt(iCluster))) continue;
1557 c->SetInChamber();
1558 new((*fClusters)[ncl++]) AliTRDcluster(*c);
1559 delete (clusterArray->RemoveAt(iCluster));
1560 }
1561
1562 }
1563 delete clusterArray;
1564
1565 return 0;
eb38ed55 1566}
1567
1568//_____________________________________________________________________________
1569Int_t AliTRDtrackerV1::LoadClusters(TTree *cTree)
1570{
41702fec 1571 //
66f6bfd9 1572 // Fills clusters into TRD tracking sectors
41702fec 1573 //
41702fec 1574
48f8adf3 1575 if(!fReconstructor->IsWritingClusters()){
1576 fClusters = AliTRDReconstructor::GetClusters();
1577 } else {
66f6bfd9 1578 if (ReadClusters(fClusters, cTree)) {
1579 AliError("Problem with reading the clusters !");
1580 return 1;
1581 }
1582 }
1583 SetClustersOwner();
1584
48f8adf3 1585 if(!fClusters || !fClusters->GetEntriesFast()){
66f6bfd9 1586 AliInfo("No TRD clusters");
41702fec 1587 return 1;
1588 }
66f6bfd9 1589
1590 //Int_t nin =
1591 BuildTrackingContainers();
1592
1593 //Int_t ncl = fClusters->GetEntriesFast();
1594 //AliInfo(Form("Clusters %d [%6.2f %% in the active volume]", ncl, 100.*float(nin)/ncl));
1595
1596 return 0;
1597}
1598
1599//_____________________________________________________________________________
1600Int_t AliTRDtrackerV1::LoadClusters(TClonesArray *clusters)
1601{
1602 //
1603 // Fills clusters into TRD tracking sectors
1604 // Function for use in the HLT
1605
1606 if(!clusters || !clusters->GetEntriesFast()){
1607 AliInfo("No TRD clusters");
41702fec 1608 return 1;
1609 }
1610
66f6bfd9 1611 fClusters = clusters;
1612 SetClustersOwner();
1613
1614 //Int_t nin =
1615 BuildTrackingContainers();
1616
1617 //Int_t ncl = fClusters->GetEntriesFast();
1618 //AliInfo(Form("Clusters %d [%6.2f %% in the active volume]", ncl, 100.*float(nin)/ncl));
1619
1620 return 0;
1621}
1622
1623
1624//____________________________________________________________________
1625Int_t AliTRDtrackerV1::BuildTrackingContainers()
1626{
1627// Building tracking containers for clusters
1628
1629 Int_t nin =0, icl = fClusters->GetEntriesFast();
41702fec 1630 while (icl--) {
1631 AliTRDcluster *c = (AliTRDcluster *) fClusters->UncheckedAt(icl);
1632 if(c->IsInChamber()) nin++;
1633 Int_t detector = c->GetDetector();
1634 Int_t sector = fGeom->GetSector(detector);
053767a4 1635 Int_t stack = fGeom->GetStack(detector);
1636 Int_t layer = fGeom->GetLayer(detector);
41702fec 1637
053767a4 1638 fTrSec[sector].GetChamber(stack, layer, kTRUE)->InsertCluster(c, icl);
41702fec 1639 }
b0a48c4d 1640
1641 const AliTRDCalDet *cal = AliTRDcalibDB::Instance()->GetT0Det();
053767a4 1642 for(int isector =0; isector<AliTRDgeometry::kNsector; isector++){
41702fec 1643 if(!fTrSec[isector].GetNChambers()) continue;
b0a48c4d 1644 fTrSec[isector].Init(fReconstructor, cal);
41702fec 1645 }
66f6bfd9 1646
1647 return nin;
eb38ed55 1648}
1649
1650
66f6bfd9 1651
0906e73e 1652//____________________________________________________________________
1653void AliTRDtrackerV1::UnloadClusters()
1654{
41702fec 1655 //
1656 // Clears the arrays of clusters and tracks. Resets sectors and timebins
1657 //
0906e73e 1658
41702fec 1659 if(fTracks) fTracks->Delete();
1660 if(fTracklets) fTracklets->Delete();
48f8adf3 1661 if(fClusters){
1662 if(IsClustersOwner()) fClusters->Delete();
1663
1664 // save clusters array in the reconstructor for further use.
1665 if(!fReconstructor->IsWritingClusters()){
1666 AliTRDReconstructor::SetClusters(fClusters);
1667 SetClustersOwner(kFALSE);
1668 } else AliTRDReconstructor::SetClusters(0x0);
1669 }
0906e73e 1670
053767a4 1671 for (int i = 0; i < AliTRDgeometry::kNsector; i++) fTrSec[i].Clear();
0906e73e 1672
41702fec 1673 // Increment the Event Number
1674 AliTRDtrackerDebug::SetEventNumber(AliTRDtrackerDebug::GetEventNumber() + 1);
eb38ed55 1675}
0906e73e 1676
eb38ed55 1677//_____________________________________________________________________________
1678Bool_t AliTRDtrackerV1::AdjustSector(AliTRDtrackV1 *track)
1679{
41702fec 1680 //
1681 // Rotates the track when necessary
1682 //
1683
1684 Double_t alpha = AliTRDgeometry::GetAlpha();
1685 Double_t y = track->GetY();
1686 Double_t ymax = track->GetX()*TMath::Tan(0.5*alpha);
1687
1688 if (y > ymax) {
1689 if (!track->Rotate( alpha)) {
1690 return kFALSE;
1691 }
1692 }
1693 else if (y < -ymax) {
1694 if (!track->Rotate(-alpha)) {
1695 return kFALSE;
1696 }
1697 }
1698
1699 return kTRUE;
0906e73e 1700
1701}
1702
eb38ed55 1703
0906e73e 1704//____________________________________________________________________
1705AliTRDseedV1* AliTRDtrackerV1::GetTracklet(AliTRDtrackV1 *track, Int_t p, Int_t &idx)
1706{
41702fec 1707 // Find tracklet for TRD track <track>
1708 // Parameters
1709 // - track
1710 // - sector
1711 // - plane
1712 // - index
1713 // Output
1714 // tracklet
1715 // index
1716 // Detailed description
1717 //
1718 idx = track->GetTrackletIndex(p);
1719 AliTRDseedV1 *tracklet = (idx==0xffff) ? 0x0 : (AliTRDseedV1*)fTracklets->UncheckedAt(idx);
1720
1721 return tracklet;
0906e73e 1722}
1723
1724//____________________________________________________________________
3b57a3f7 1725AliTRDseedV1* AliTRDtrackerV1::SetTracklet(AliTRDseedV1 *tracklet)
0906e73e 1726{
41702fec 1727 // Add this tracklet to the list of tracklets stored in the tracker
1728 //
1729 // Parameters
1730 // - tracklet : pointer to the tracklet to be added to the list
1731 //
1732 // Output
1733 // - the index of the new tracklet in the tracker tracklets list
1734 //
1735 // Detailed description
1736 // Build the tracklets list if it is not yet created (late initialization)
1737 // and adds the new tracklet to the list.
1738 //
1739 if(!fTracklets){
053767a4 1740 fTracklets = new TClonesArray("AliTRDseedV1", AliTRDgeometry::Nsector()*kMaxTracksStack);
41702fec 1741 fTracklets->SetOwner(kTRUE);
1742 }
1743 Int_t nentries = fTracklets->GetEntriesFast();
1744 return new ((*fTracklets)[nentries]) AliTRDseedV1(*tracklet);
972ef65e 1745}
1746
d20df6fc 1747//____________________________________________________________________
1748AliTRDtrackV1* AliTRDtrackerV1::SetTrack(AliTRDtrackV1 *track)
1749{
1750 // Add this track to the list of tracks stored in the tracker
1751 //
1752 // Parameters
1753 // - track : pointer to the track to be added to the list
1754 //
1755 // Output
1756 // - the pointer added
1757 //
1758 // Detailed description
1759 // Build the tracks list if it is not yet created (late initialization)
1760 // and adds the new track to the list.
1761 //
1762 if(!fTracks){
053767a4 1763 fTracks = new TClonesArray("AliTRDtrackV1", AliTRDgeometry::Nsector()*kMaxTracksStack);
d20df6fc 1764 fTracks->SetOwner(kTRUE);
1765 }
1766 Int_t nentries = fTracks->GetEntriesFast();
1767 return new ((*fTracks)[nentries]) AliTRDtrackV1(*track);
1768}
1769
1770
0906e73e 1771
e4f2f73d 1772//____________________________________________________________________
eb38ed55 1773Int_t AliTRDtrackerV1::Clusters2TracksSM(Int_t sector, AliESDEvent *esd)
e4f2f73d 1774{
41702fec 1775 //
1776 // Steer tracking for one SM.
1777 //
1778 // Parameters :
1779 // sector : Array of (SM) propagation layers containing clusters
1780 // esd : The current ESD event. On output it contains the also
1781 // the ESD (TRD) tracks found in this SM.
1782 //
1783 // Output :
1784 // Number of tracks found in this TRD supermodule.
1785 //
1786 // Detailed description
1787 //
1788 // 1. Unpack AliTRDpropagationLayers objects for each stack.
1789 // 2. Launch stack tracking.
1790 // See AliTRDtrackerV1::Clusters2TracksStack() for details.
1791 // 3. Pack results in the ESD event.
1792 //
1793
1794 // allocate space for esd tracks in this SM
1795 TClonesArray esdTrackList("AliESDtrack", 2*kMaxTracksStack);
1796 esdTrackList.SetOwner();
1797
1798 Int_t nTracks = 0;
1799 Int_t nChambers = 0;
1800 AliTRDtrackingChamber **stack = 0x0, *chamber = 0x0;
053767a4 1801 for(int istack = 0; istack<AliTRDgeometry::kNstack; istack++){
41702fec 1802 if(!(stack = fTrSec[sector].GetStack(istack))) continue;
1803 nChambers = 0;
053767a4 1804 for(int ilayer=0; ilayer<AliTRDgeometry::kNlayer; ilayer++){
1805 if(!(chamber = stack[ilayer])) continue;
3a039a31 1806 if(chamber->GetNClusters() < fgNTimeBins * fReconstructor->GetRecoParam() ->GetFindableClusters()) continue;
41702fec 1807 nChambers++;
053767a4 1808 //AliInfo(Form("sector %d stack %d layer %d clusters %d", sector, istack, ilayer, chamber->GetNClusters()));
41702fec 1809 }
1810 if(nChambers < 4) continue;
1811 //AliInfo(Form("Doing stack %d", istack));
1812 nTracks += Clusters2TracksStack(stack, &esdTrackList);
1813 }
1814 //AliInfo(Form("Found %d tracks in SM %d [%d]\n", nTracks, sector, esd->GetNumberOfTracks()));
1815
1816 for(int itrack=0; itrack<nTracks; itrack++)
1817 esd->AddTrack((AliESDtrack*)esdTrackList[itrack]);
1818
1819 // Reset Track and Candidate Number
1820 AliTRDtrackerDebug::SetCandidateNumber(0);
1821 AliTRDtrackerDebug::SetTrackNumber(0);
1822 return nTracks;
e4f2f73d 1823}
1824
1825//____________________________________________________________________
eb38ed55 1826Int_t AliTRDtrackerV1::Clusters2TracksStack(AliTRDtrackingChamber **stack, TClonesArray *esdTrackList)
e4f2f73d 1827{
41702fec 1828 //
1829 // Make tracks in one TRD stack.
1830 //
1831 // Parameters :
1832 // layer : Array of stack propagation layers containing clusters
1833 // esdTrackList : Array of ESD tracks found by the stand alone tracker.
1834 // On exit the tracks found in this stack are appended.
1835 //
1836 // Output :
1837 // Number of tracks found in this stack.
1838 //
1839 // Detailed description
1840 //
1841 // 1. Find the 3 most useful seeding chambers. See BuildSeedingConfigs() for details.
1842 // 2. Steer AliTRDtrackerV1::MakeSeeds() for 3 seeding layer configurations.
1843 // See AliTRDtrackerV1::MakeSeeds() for more details.
1844 // 3. Arrange track candidates in decreasing order of their quality
1845 // 4. Classify tracks in 5 categories according to:
1846 // a) number of layers crossed
1847 // b) track quality
1848 // 5. Sign clusters by tracks in decreasing order of track quality
1849 // 6. Build AliTRDtrack out of seeding tracklets
1850 // 7. Cook MC label
1851 // 8. Build ESD track and register it to the output list
1852 //
1853
b0a48c4d 1854 const AliTRDCalDet *cal = AliTRDcalibDB::Instance()->GetT0Det();
41702fec 1855 AliTRDtrackingChamber *chamber = 0x0;
1856 AliTRDseedV1 sseed[kMaxTracksStack*6]; // to be initialized
1857 Int_t pars[4]; // MakeSeeds parameters
1858
1859 //Double_t alpha = AliTRDgeometry::GetAlpha();
1860 //Double_t shift = .5 * alpha;
1861 Int_t configs[kNConfigs];
1862
1863 // Build initial seeding configurations
1864 Double_t quality = BuildSeedingConfigs(stack, configs);
3a039a31 1865 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){
41702fec 1866 AliInfo(Form("Plane config %d %d %d Quality %f"
1867 , configs[0], configs[1], configs[2], quality));
1868 }
d931f2aa 1869
41702fec 1870
1871 // Initialize contors
1872 Int_t ntracks, // number of TRD track candidates
1873 ntracks1, // number of registered TRD tracks/iter
1874 ntracks2 = 0; // number of all registered TRD tracks in stack
1875 fSieveSeeding = 0;
d931f2aa 1876
1877 // Get stack index
1878 Int_t ic = 0; AliTRDtrackingChamber **cIter = &stack[0];
1879 while(ic<kNPlanes && !(*cIter)){ic++; cIter++;}
1880 if(!(*cIter)) return ntracks2;
1881 Int_t istack = fGeom->GetStack((*cIter)->GetDetector());
1882
41702fec 1883 do{
1884 // Loop over seeding configurations
1885 ntracks = 0; ntracks1 = 0;
1886 for (Int_t iconf = 0; iconf<3; iconf++) {
1887 pars[0] = configs[iconf];
1888 pars[1] = ntracks;
d931f2aa 1889 pars[2] = istack;
41702fec 1890 ntracks = MakeSeeds(stack, &sseed[6*ntracks], pars);
1891 if(ntracks == kMaxTracksStack) break;
1892 }
3a039a31 1893 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1) AliInfo(Form("Candidate TRD tracks %d in iteration %d.", ntracks, fSieveSeeding));
41702fec 1894
1895 if(!ntracks) break;
1896
1897 // Sort the seeds according to their quality
1898 Int_t sort[kMaxTracksStack];
1899 TMath::Sort(ntracks, fTrackQuality, sort, kTRUE);
1900
1901 // Initialize number of tracks so far and logic switches
1902 Int_t ntracks0 = esdTrackList->GetEntriesFast();
1903 Bool_t signedTrack[kMaxTracksStack];
1904 Bool_t fakeTrack[kMaxTracksStack];
1905 for (Int_t i=0; i<ntracks; i++){
1906 signedTrack[i] = kFALSE;
1907 fakeTrack[i] = kFALSE;
1908 }
1909 //AliInfo("Selecting track candidates ...");
1910
1911 // Sieve clusters in decreasing order of track quality
1912 Double_t trackParams[7];
1913 // AliTRDseedV1 *lseed = 0x0;
1914 Int_t jSieve = 0, candidates;
1915 do{
1916 //AliInfo(Form("\t\tITER = %i ", jSieve));
1917
1918 // Check track candidates
1919 candidates = 0;
1920 for (Int_t itrack = 0; itrack < ntracks; itrack++) {
804bb02e 1921 Int_t trackIndex = sort[itrack];
1922 if (signedTrack[trackIndex] || fakeTrack[trackIndex]) continue;
41702fec 1923
1924
804bb02e 1925 // Calculate track parameters from tracklets seeds
804bb02e 1926 Int_t ncl = 0;
1927 Int_t nused = 0;
1928 Int_t nlayers = 0;
1929 Int_t findable = 0;
1930 for (Int_t jLayer = 0; jLayer < kNPlanes; jLayer++) {
1931 Int_t jseed = kNPlanes*trackIndex+jLayer;
1932 if(!sseed[jseed].IsOK()) continue;
1933 if (TMath::Abs(sseed[jseed].GetYref(0) / sseed[jseed].GetX0()) < 0.15) findable++;
1934
1935 sseed[jseed].UpdateUsed();
1936 ncl += sseed[jseed].GetN2();
1937 nused += sseed[jseed].GetNUsed();
1938 nlayers++;
804bb02e 1939 }
1940
41702fec 1941 // Filter duplicated tracks
1942 if (nused > 30){
1943 //printf("Skip %d nused %d\n", trackIndex, nused);
1944 fakeTrack[trackIndex] = kTRUE;
1945 continue;
1946 }
1947 if (Float_t(nused)/ncl >= .25){
1948 //printf("Skip %d nused/ncl >= .25\n", trackIndex);
1949 fakeTrack[trackIndex] = kTRUE;
1950 continue;
1951 }
1952
1953 // Classify tracks
1954 Bool_t skip = kFALSE;
1955 switch(jSieve){
1956 case 0:
1957 if(nlayers < 6) {skip = kTRUE; break;}
1958 if(TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -5.){skip = kTRUE; break;}
1959 break;
1960
1961 case 1:
1962 if(nlayers < findable){skip = kTRUE; break;}
1963 if(TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -4.){skip = kTRUE; break;}
1964 break;
1965
1966 case 2:
1967 if ((nlayers == findable) || (nlayers == 6)) { skip = kTRUE; break;}
1968 if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -6.0){skip = kTRUE; break;}
1969 break;
1970
1971 case 3:
1972 if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -5.){skip = kTRUE; break;}
1973 break;
1974
1975 case 4:
1976 if (nlayers == 3){skip = kTRUE; break;}
1977 //if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) - nused/(nlayers-3.0) < -15.0){skip = kTRUE; break;}
1978 break;
1979 }
1980 if(skip){
1981 candidates++;
1982 //printf("REJECTED : %d [%d] nlayers %d trackQuality = %e nused %d\n", itrack, trackIndex, nlayers, fTrackQuality[trackIndex], nused);
1983 continue;
1984 }
1985 signedTrack[trackIndex] = kTRUE;
1986
41702fec 1987
1988 // Sign clusters
1989 AliTRDcluster *cl = 0x0; Int_t clusterIndex = -1;
be24510a 1990 for (Int_t jLayer = 0; jLayer < kNPlanes; jLayer++) {
41702fec 1991 Int_t jseed = kNPlanes*trackIndex+jLayer;
1992 if(!sseed[jseed].IsOK()) continue;
1993 if(TMath::Abs(sseed[jseed].GetYfit(1) - sseed[jseed].GetYfit(1)) >= .2) continue; // check this condition with Marian
1994 sseed[jseed].UseClusters();
1995 if(!cl){
1996 Int_t ic = 0;
1997 while(!(cl = sseed[jseed].GetClusters(ic))) ic++;
1998 clusterIndex = sseed[jseed].GetIndexes(ic);
1999 }
2000 }
2001 if(!cl) continue;
2002
2003
2004 // Build track parameters
2005 AliTRDseedV1 *lseed =&sseed[trackIndex*6];
e79f8eb0 2006/* Int_t idx = 0;
41702fec 2007 while(idx<3 && !lseed->IsOK()) {
2008 idx++;
2009 lseed++;
e79f8eb0 2010 }*/
e79f8eb0 2011 Double_t x = lseed->GetX0();// - 3.5;
41702fec 2012 trackParams[0] = x; //NEW AB
e79f8eb0 2013 trackParams[1] = lseed->GetYref(0); // lseed->GetYat(x);
2014 trackParams[2] = lseed->GetZref(0); // lseed->GetZat(x);
2015 trackParams[3] = TMath::Sin(TMath::ATan(lseed->GetYref(1)));
41702fec 2016 trackParams[4] = lseed->GetZref(1) / TMath::Sqrt(1. + lseed->GetYref(1) * lseed->GetYref(1));
be24510a 2017 trackParams[5] = lseed->GetC();
41702fec 2018 Int_t ich = 0; while(!(chamber = stack[ich])) ich++;
2019 trackParams[6] = fGeom->GetSector(chamber->GetDetector());/* *alpha+shift; // Supermodule*/
2020
3a039a31 2021 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){
41702fec 2022 AliInfo(Form("Track %d [%d] nlayers %d trackQuality = %e nused %d, yref = %3.3f", itrack, trackIndex, nlayers, fTrackQuality[trackIndex], nused, trackParams[1]));
2023
2024 Int_t nclusters = 0;
2025 AliTRDseedV1 *dseed[6];
804bb02e 2026
2027 // Build track label - what happens if measured data ???
2028 Int_t labels[1000];
2029 Int_t outlab[1000];
2030 Int_t nlab = 0;
d877f55f 2031
2032 Int_t labelsall[1000];
2033 Int_t nlabelsall = 0;
2034 Int_t naccepted = 0;
2035
804bb02e 2036 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
2037 Int_t jseed = kNPlanes*trackIndex+iLayer;
2038 dseed[iLayer] = new AliTRDseedV1(sseed[jseed]);
2039 dseed[iLayer]->SetOwner();
2040 nclusters += sseed[jseed].GetN2();
2041 if(!sseed[jseed].IsOK()) continue;
2042 for(int ilab=0; ilab<2; ilab++){
2043 if(sseed[jseed].GetLabels(ilab) < 0) continue;
2044 labels[nlab] = sseed[jseed].GetLabels(ilab);
2045 nlab++;
2046 }
d877f55f 2047
2048 // Cooking label
2049 for (Int_t itime = 0; itime < fgNTimeBins; itime++) {
2050 if(!sseed[jseed].IsUsable(itime)) continue;
2051 naccepted++;
2052 Int_t tindex = 0, ilab = 0;
2053 while(ilab<3 && (tindex = sseed[jseed].GetClusters(itime)->GetLabel(ilab)) >= 0){
2054 labelsall[nlabelsall++] = tindex;
2055 ilab++;
2056 }
2057 }
41702fec 2058 }
804bb02e 2059 Freq(nlab,labels,outlab,kFALSE);
2060 Int_t label = outlab[0];
2061 Int_t frequency = outlab[1];
2062 Freq(nlabelsall,labelsall,outlab,kFALSE);
2063 Int_t label1 = outlab[0];
2064 Int_t label2 = outlab[2];
2065 Float_t fakeratio = (naccepted - outlab[1]) / Float_t(naccepted);
2066
41702fec 2067 //Int_t eventNrInFile = esd->GetEventNumberInFile();
2068 //AliInfo(Form("Number of clusters %d.", nclusters));
2069 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2070 Int_t trackNumber = AliTRDtrackerDebug::GetTrackNumber();
2071 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2072 TTreeSRedirector &cstreamer = *fgDebugStreamer;
2073 cstreamer << "Clusters2TracksStack"
2074 << "EventNumber=" << eventNumber
2075 << "TrackNumber=" << trackNumber
2076 << "CandidateNumber=" << candidateNumber
2077 << "Iter=" << fSieveSeeding
2078 << "Like=" << fTrackQuality[trackIndex]
2079 << "S0.=" << dseed[0]
2080 << "S1.=" << dseed[1]
2081 << "S2.=" << dseed[2]
2082 << "S3.=" << dseed[3]
2083 << "S4.=" << dseed[4]
2084 << "S5.=" << dseed[5]
2085 << "p0=" << trackParams[0]
2086 << "p1=" << trackParams[1]
2087 << "p2=" << trackParams[2]
2088 << "p3=" << trackParams[3]
2089 << "p4=" << trackParams[4]
2090 << "p5=" << trackParams[5]
2091 << "p6=" << trackParams[6]
2092 << "Label=" << label
2093 << "Label1=" << label1
2094 << "Label2=" << label2
2095 << "FakeRatio=" << fakeratio
2096 << "Freq=" << frequency
2097 << "Ncl=" << ncl
2098 << "NLayers=" << nlayers
2099 << "Findable=" << findable
41702fec 2100 << "NUsed=" << nused
2101 << "\n";
2102 }
2103
2104 AliTRDtrackV1 *track = MakeTrack(&sseed[trackIndex*kNPlanes], trackParams);
2105 if(!track){
2106 AliWarning("Fail to build a TRD Track.");
2107 continue;
2108 }
76b60503 2109
41702fec 2110 //AliInfo("End of MakeTrack()");
098c3c3d 2111 AliESDtrack *esdTrack = new ((*esdTrackList)[ntracks0++]) AliESDtrack();
2112 esdTrack->UpdateTrackParams(track, AliESDtrack::kTRDout);
2113 esdTrack->SetLabel(track->GetLabel());
2114 track->UpdateESDtrack(esdTrack);
41702fec 2115 // write ESD-friends if neccessary
3a039a31 2116 if (fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 0){
41702fec 2117 AliTRDtrackV1 *calibTrack = new AliTRDtrackV1(*track);
2118 calibTrack->SetOwner();
098c3c3d 2119 esdTrack->AddCalibObject(calibTrack);
41702fec 2120 }
41702fec 2121 ntracks1++;
2122 AliTRDtrackerDebug::SetTrackNumber(AliTRDtrackerDebug::GetTrackNumber() + 1);
2123 }
2124
2125 jSieve++;
2126 } while(jSieve<5 && candidates); // end track candidates sieve
2127 if(!ntracks1) break;
2128
2129 // increment counters
2130 ntracks2 += ntracks1;
4302c900 2131
2132 if(fReconstructor->IsHLT()) break;
41702fec 2133 fSieveSeeding++;
2134
2135 // Rebuild plane configurations and indices taking only unused clusters into account
2136 quality = BuildSeedingConfigs(stack, configs);
3a039a31 2137 if(quality < 1.E-7) break; //fReconstructor->GetRecoParam() ->GetPlaneQualityThreshold()) break;
41702fec 2138
2139 for(Int_t ip = 0; ip < kNPlanes; ip++){
2140 if(!(chamber = stack[ip])) continue;
b0a48c4d 2141 chamber->Build(fGeom, cal);//Indices(fSieveSeeding);
41702fec 2142 }
2143
3a039a31 2144 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){
41702fec 2145 AliInfo(Form("Sieve level %d Plane config %d %d %d Quality %f", fSieveSeeding, configs[0], configs[1], configs[2], quality));
2146 }
2147 } while(fSieveSeeding<10); // end stack clusters sieve
2148
2149
2150
2151 //AliInfo(Form("Registered TRD tracks %d in stack %d.", ntracks2, pars[1]));
2152
2153 return ntracks2;
e4f2f73d 2154}
2155
2156//___________________________________________________________________
eb38ed55 2157Double_t AliTRDtrackerV1::BuildSeedingConfigs(AliTRDtrackingChamber **stack, Int_t *configs)
e4f2f73d 2158{
41702fec 2159 //
2160 // Assign probabilities to chambers according to their
2161 // capability of producing seeds.
2162 //
2163 // Parameters :
2164 //
2165 // layers : Array of stack propagation layers for all 6 chambers in one stack
2166 // configs : On exit array of configuration indexes (see GetSeedingConfig()
2167 // for details) in the decreasing order of their seeding probabilities.
2168 //
2169 // Output :
2170 //
2171 // Return top configuration quality
2172 //
2173 // Detailed description:
2174 //
2175 // To each chamber seeding configuration (see GetSeedingConfig() for
2176 // the list of all configurations) one defines 2 quality factors:
2177 // - an apriori topological quality (see GetSeedingConfig() for details) and
2178 // - a data quality based on the uniformity of the distribution of
2179 // clusters over the x range (time bins population). See CookChamberQA() for details.
2180 // The overall chamber quality is given by the product of this 2 contributions.
2181 //
2182
2183 Double_t chamberQ[kNPlanes];
2184 AliTRDtrackingChamber *chamber = 0x0;
2185 for(int iplane=0; iplane<kNPlanes; iplane++){
2186 if(!(chamber = stack[iplane])) continue;
2187 chamberQ[iplane] = (chamber = stack[iplane]) ? chamber->GetQuality() : 0.;
2188 }
2189
2190 Double_t tconfig[kNConfigs];
2191 Int_t planes[4];
2192 for(int iconf=0; iconf<kNConfigs; iconf++){
2193 GetSeedingConfig(iconf, planes);
2194 tconfig[iconf] = fgTopologicQA[iconf];
2195 for(int iplane=0; iplane<4; iplane++) tconfig[iconf] *= chamberQ[planes[iplane]];
2196 }
2197
2198 TMath::Sort((Int_t)kNConfigs, tconfig, configs, kTRUE);
2199 // AliInfo(Form("q[%d] = %f", configs[0], tconfig[configs[0]]));
2200 // AliInfo(Form("q[%d] = %f", configs[1], tconfig[configs[1]]));
2201 // AliInfo(Form("q[%d] = %f", configs[2], tconfig[configs[2]]));
2202
2203 return tconfig[configs[0]];
e4f2f73d 2204}
2205
2206//____________________________________________________________________
eb38ed55 2207Int_t AliTRDtrackerV1::MakeSeeds(AliTRDtrackingChamber **stack, AliTRDseedV1 *sseed, Int_t *ipar)
e4f2f73d 2208{
41702fec 2209 //
2210 // Make tracklet seeds in the TRD stack.
2211 //
2212 // Parameters :
2213 // layers : Array of stack propagation layers containing clusters
2214 // sseed : Array of empty tracklet seeds. On exit they are filled.
2215 // ipar : Control parameters:
2216 // ipar[0] -> seeding chambers configuration
2217 // ipar[1] -> stack index
2218 // ipar[2] -> number of track candidates found so far
2219 //
2220 // Output :
2221 // Number of tracks candidates found.
2222 //
2223 // Detailed description
2224 //
2225 // The following steps are performed:
2226 // 1. Select seeding layers from seeding chambers
2227 // 2. Select seeding clusters from the seeding AliTRDpropagationLayerStack.
2228 // The clusters are taken from layer 3, layer 0, layer 1 and layer 2, in
2229 // this order. The parameters controling the range of accepted clusters in
2230 // layer 0, 1, and 2 are defined in AliTRDchamberTimeBin::BuildCond().
2231 // 3. Helix fit of the cluster set. (see AliTRDtrackerFitter::FitRieman(AliTRDcluster**))
2232 // 4. Initialize seeding tracklets in the seeding chambers.
2233 // 5. Filter 0.
2234 // Chi2 in the Y direction less than threshold ... (1./(3. - sLayer))
2235 // Chi2 in the Z direction less than threshold ... (1./(3. - sLayer))
2236 // 6. Attach clusters to seeding tracklets and find linear approximation of
2237 // the tracklet (see AliTRDseedV1::AttachClustersIter()). The number of used
2238 // clusters used by current seeds should not exceed ... (25).
2239 // 7. Filter 1.
2240 // All 4 seeding tracklets should be correctly constructed (see
2241 // AliTRDseedV1::AttachClustersIter())
2242 // 8. Helix fit of the seeding tracklets
2243 // 9. Filter 2.
2244 // Likelihood calculation of the fit. (See AliTRDtrackerV1::CookLikelihood() for details)
2245 // 10. Extrapolation of the helix fit to the other 2 chambers:
2246 // a) Initialization of extrapolation tracklet with fit parameters
2247 // b) Helix fit of tracklets
2248 // c) Attach clusters and linear interpolation to extrapolated tracklets
2249 // d) Helix fit of tracklets
2250 // 11. Improve seeding tracklets quality by reassigning clusters.
2251 // See AliTRDtrackerV1::ImproveSeedQuality() for details.
2252 // 12. Helix fit of all 6 seeding tracklets and chi2 calculation
2253 // 13. Hyperplane fit and track quality calculation. See AliTRDtrackerFitter::FitHyperplane() for details.
2254 // 14. Cooking labels for tracklets. Should be done only for MC
2255 // 15. Register seeds.
2256 //
2257
2258 AliTRDtrackingChamber *chamber = 0x0;
be24510a 2259 AliTRDcluster *c[kNSeedPlanes] = {0x0, 0x0, 0x0, 0x0}; // initilize seeding clusters
41702fec 2260 AliTRDseedV1 *cseed = &sseed[0]; // initialize tracklets for first track
2261 Int_t ncl, mcl; // working variable for looping over clusters
2262 Int_t index[AliTRDchamberTimeBin::kMaxClustersLayer], jndex[AliTRDchamberTimeBin::kMaxClustersLayer];
2263 // chi2 storage
2264 // chi2[0] = tracklet chi2 on the Z direction
2265 // chi2[1] = tracklet chi2 on the R direction
2266 Double_t chi2[4];
2267
e79f8eb0 2268 // Default positions for the anode wire in all 6 Layers in case of a stack with missing clusters
2269 // Positions taken using cosmic data taken with SM3 after rebuild
d931f2aa 2270 Double_t x_def[kNPlanes] = {300.2, 312.8, 325.4, 338.0, 350.6, 363.2};
41702fec 2271
2272 // this should be data member of AliTRDtrack
2273 Double_t seedQuality[kMaxTracksStack];
2274
2275 // unpack control parameters
2276 Int_t config = ipar[0];
2277 Int_t ntracks = ipar[1];
d931f2aa 2278 Int_t istack = ipar[2];
41702fec 2279 Int_t planes[kNSeedPlanes]; GetSeedingConfig(config, planes);
be24510a 2280 Int_t planesExt[kNPlanes-kNSeedPlanes]; GetExtrapolationConfig(config, planesExt);
2281
2282
41702fec 2283 // Init chambers geometry
41702fec 2284 Double_t hL[kNPlanes]; // Tilting angle
2285 Float_t padlength[kNPlanes]; // pad lenghts
2286 AliTRDpadPlane *pp = 0x0;
2287 for(int iplane=0; iplane<kNPlanes; iplane++){
2288 pp = fGeom->GetPadPlane(iplane, istack);
bb79ccd5 2289 hL[iplane] = TMath::Tan(TMath::DegToRad()*pp->GetTiltingAngle());
41702fec 2290 padlength[iplane] = pp->GetLengthIPad();
2291 }
2292
3a039a31 2293 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){
41702fec 2294 AliInfo(Form("Making seeds Stack[%d] Config[%d] Tracks[%d]...", istack, config, ntracks));
2295 }
2296
d931f2aa 2297 // Build seeding layers
d611c74f 2298 ResetSeedTB();
41702fec 2299 Int_t nlayers = 0;
41702fec 2300 for(int isl=0; isl<kNSeedPlanes; isl++){
2301 if(!(chamber = stack[planes[isl]])) continue;
3a039a31 2302 if(!chamber->GetSeedingLayer(fSeedTB[isl], fGeom, fReconstructor)) continue;
41702fec 2303 nlayers++;
41702fec 2304 }
2305 if(nlayers < 4) return 0;
2306
2307
2308 // Start finding seeds
2309 Double_t cond0[4], cond1[4], cond2[4];
2310 Int_t icl = 0;
d611c74f 2311 while((c[3] = (*fSeedTB[3])[icl++])){
41702fec 2312 if(!c[3]) continue;
d611c74f 2313 fSeedTB[0]->BuildCond(c[3], cond0, 0);
2314 fSeedTB[0]->GetClusters(cond0, index, ncl);
41702fec 2315 //printf("Found c[3] candidates 0 %d\n", ncl);
2316 Int_t jcl = 0;
2317 while(jcl<ncl) {
d611c74f 2318 c[0] = (*fSeedTB[0])[index[jcl++]];
41702fec 2319 if(!c[0]) continue;
2320 Double_t dx = c[3]->GetX() - c[0]->GetX();
2321 Double_t theta = (c[3]->GetZ() - c[0]->GetZ())/dx;
2322 Double_t phi = (c[3]->GetY() - c[0]->GetY())/dx;
d611c74f 2323 fSeedTB[1]->BuildCond(c[0], cond1, 1, theta, phi);
2324 fSeedTB[1]->GetClusters(cond1, jndex, mcl);
41702fec 2325 //printf("Found c[0] candidates 1 %d\n", mcl);
2326
2327 Int_t kcl = 0;
2328 while(kcl<mcl) {
d611c74f 2329 c[1] = (*fSeedTB[1])[jndex[kcl++]];
2330 if(!c[1]) continue;
2331 fSeedTB[2]->BuildCond(c[1], cond2, 2, theta, phi);
2332 c[2] = fSeedTB[2]->GetNearestCluster(cond2);
2333 //printf("Found c[1] candidate 2 %p\n", c[2]);
2334 if(!c[2]) continue;
2335
2336 // AliInfo("Seeding clusters found. Building seeds ...");
2337 // 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());
2338
804bb02e 2339 for (Int_t il = 0; il < kNPlanes; il++) cseed[il].Reset();
41702fec 2340
d611c74f 2341 FitRieman(c, chi2);
2342
d931f2aa 2343 AliTRDseedV1 *tseed = &cseed[0];
2344 AliTRDtrackingChamber **cIter = &stack[0];
2345 for(int iLayer=0; iLayer<kNPlanes; iLayer++, tseed++, cIter++){
2346 tseed->SetDetector((*cIter) ? (*cIter)->GetDetector() : -1);
43d6ad34 2347 tseed->SetTilt(hL[iLayer]);
2348 tseed->SetPadLength(padlength[iLayer]);
3a039a31 2349 tseed->SetReconstructor(fReconstructor);
d931f2aa 2350 tseed->SetX0((*cIter) ? (*cIter)->GetX() : x_def[iLayer]);
d611c74f 2351 tseed->Init(GetRiemanFitter());
2352 }
2353
2354 Bool_t isFake = kFALSE;
3a039a31 2355 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){
d611c74f 2356 if (c[0]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
2357 if (c[1]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
2358 if (c[2]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
2359
2360 Double_t xpos[4];
2361 for(Int_t l = 0; l < kNSeedPlanes; l++) xpos[l] = fSeedTB[l]->GetX();
2362 Float_t yref[4];
2363 for(int il=0; il<4; il++) yref[il] = cseed[planes[il]].GetYref(0);
2364 Int_t ll = c[3]->GetLabel(0);
2365 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2366 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2367 AliRieman *rim = GetRiemanFitter();
2368 TTreeSRedirector &cs0 = *fgDebugStreamer;
2369 cs0 << "MakeSeeds0"
2370 <<"EventNumber=" << eventNumber
2371 <<"CandidateNumber=" << candidateNumber
2372 <<"isFake=" << isFake
2373 <<"config=" << config
2374 <<"label=" << ll
2375 <<"chi2z=" << chi2[0]
2376 <<"chi2y=" << chi2[1]
2377 <<"Y2exp=" << cond2[0]
2378 <<"Z2exp=" << cond2[1]
2379 <<"X0=" << xpos[0] //layer[sLayer]->GetX()
2380 <<"X1=" << xpos[1] //layer[sLayer + 1]->GetX()
2381 <<"X2=" << xpos[2] //layer[sLayer + 2]->GetX()
2382 <<"X3=" << xpos[3] //layer[sLayer + 3]->GetX()
2383 <<"yref0=" << yref[0]
2384 <<"yref1=" << yref[1]
2385 <<"yref2=" << yref[2]
2386 <<"yref3=" << yref[3]
2387 <<"c0.=" << c[0]
2388 <<"c1.=" << c[1]
2389 <<"c2.=" << c[2]
2390 <<"c3.=" << c[3]
2391 <<"Seed0.=" << &cseed[planes[0]]
2392 <<"Seed1.=" << &cseed[planes[1]]
2393 <<"Seed2.=" << &cseed[planes[2]]
2394 <<"Seed3.=" << &cseed[planes[3]]
2395 <<"RiemanFitter.=" << rim
2396 <<"\n";
2397 }
3a039a31 2398 if(chi2[0] > fReconstructor->GetRecoParam() ->GetChi2Z()/*7./(3. - sLayer)*//*iter*/){
91834b8d 2399// //AliInfo(Form("Failed chi2 filter on chi2Z [%f].", chi2[0]));
d611c74f 2400 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2401 continue;
2402 }
3a039a31 2403 if(chi2[1] > fReconstructor->GetRecoParam() ->GetChi2Y()/*1./(3. - sLayer)*//*iter*/){
91834b8d 2404// //AliInfo(Form("Failed chi2 filter on chi2Y [%f].", chi2[1]));
d611c74f 2405 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2406 continue;
2407 }
2408 //AliInfo("Passed chi2 filter.");
2409
2410 // try attaching clusters to tracklets
2411 Int_t nUsedCl = 0;
2412 Int_t mlayers = 0;
be24510a 2413 for(int iLayer=0; iLayer<kNSeedPlanes; iLayer++){
d611c74f 2414 Int_t jLayer = planes[iLayer];
2415 if(!cseed[jLayer].AttachClustersIter(stack[jLayer], 5., kFALSE, c[iLayer])) continue;
2416 nUsedCl += cseed[jLayer].GetNUsed();
2417 if(nUsedCl > 25) break;
2418 mlayers++;
2419 }
be24510a 2420
2421 if(mlayers < kNSeedPlanes){
2422 //AliInfo(Form("Failed updating all seeds %d [%d].", mlayers, kNSeedPlanes));
2423 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2424 continue;
2425 }
2426
2427 // temporary exit door for the HLT
4302c900 2428 if(fReconstructor->IsHLT()){
be24510a 2429 // attach clusters to extrapolation chambers
2430 for(int iLayer=0; iLayer<kNPlanes-kNSeedPlanes; iLayer++){
2431 Int_t jLayer = planesExt[iLayer];
2432 if(!(chamber = stack[jLayer])) continue;
2433 cseed[jLayer].AttachClustersIter(chamber, 1000.);
2434 }
4302c900 2435 fTrackQuality[ntracks] = 1.; // dummy value
2436 ntracks++;
218ba867 2437 if(ntracks == kMaxTracksStack) return ntracks;
4302c900 2438 cseed += 6;
2439 continue;
2440 }
2441
be24510a 2442
d611c74f 2443 // fit tracklets and cook likelihood
2444 FitTiltedRieman(&cseed[0], kTRUE);// Update Seeds and calculate Likelihood
91834b8d 2445 Double_t like = CookLikelihood(&cseed[0], planes); // to be checked
d611c74f 2446
3a039a31 2447 if (TMath::Log(1.E-9 + like) < fReconstructor->GetRecoParam() ->GetTrackLikelihood()){
d611c74f 2448 //AliInfo(Form("Failed likelihood %f[%e].", TMath::Log(1.E-9 + like), like));
2449 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2450 continue;
2451 }
2452 //AliInfo(Form("Passed likelihood %f[%e].", TMath::Log(1.E-9 + like), like));
2453
2454 // book preliminary results
2455 seedQuality[ntracks] = like;
2456 fSeedLayer[ntracks] = config;/*sLayer;*/
2457
2458 // attach clusters to the extrapolation seeds
d611c74f 2459 Int_t nusedf = 0; // debug value
be24510a 2460 for(int iLayer=0; iLayer<kNPlanes-kNSeedPlanes; iLayer++){
2461 Int_t jLayer = planesExt[iLayer];
d611c74f 2462 if(!(chamber = stack[jLayer])) continue;
d611c74f 2463
2464 // fit extrapolated seed
2465 if ((jLayer == 0) && !(cseed[1].IsOK())) continue;
2466 if ((jLayer == 5) && !(cseed[4].IsOK())) continue;
2467 AliTRDseedV1 pseed = cseed[jLayer];
2468 if(!pseed.AttachClustersIter(chamber, 1000.)) continue;
2469 cseed[jLayer] = pseed;
2470 nusedf += cseed[jLayer].GetNUsed(); // debug value
2471 FitTiltedRieman(cseed, kTRUE);
2472 }
2473
2474 // AliInfo("Extrapolation done.");
2475 // Debug Stream containing all the 6 tracklets
3a039a31 2476 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){
d611c74f 2477 TTreeSRedirector &cstreamer = *fgDebugStreamer;
2478 TLinearFitter *tiltedRieman = GetTiltedRiemanFitter();
2479 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2480 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2481 cstreamer << "MakeSeeds1"
2482 << "EventNumber=" << eventNumber
2483 << "CandidateNumber=" << candidateNumber
2484 << "S0.=" << &cseed[0]
2485 << "S1.=" << &cseed[1]
2486 << "S2.=" << &cseed[2]
2487 << "S3.=" << &cseed[3]
2488 << "S4.=" << &cseed[4]
2489 << "S5.=" << &cseed[5]
2490 << "FitterT.=" << tiltedRieman
2491 << "\n";
2492 }
2493
fb872574 2494 if(fReconstructor->GetRecoParam()->HasImproveTracklets() && ImproveSeedQuality(stack, cseed) < 4){
d611c74f 2495 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2496 continue;
2497 }
2498 //AliInfo("Improve seed quality done.");
2499
2500 // fit full track and cook likelihoods
2501 // Double_t curv = FitRieman(&cseed[0], chi2);
2502 // Double_t chi2ZF = chi2[0] / TMath::Max((mlayers - 3.), 1.);
2503 // Double_t chi2RF = chi2[1] / TMath::Max((mlayers - 3.), 1.);
2504
2505 // do the final track fitting (Once with vertex constraint and once without vertex constraint)
2506 Double_t chi2Vals[3];
2507 chi2Vals[0] = FitTiltedRieman(&cseed[0], kFALSE);
91834b8d 2508 if(fReconstructor->GetRecoParam()->IsVertexConstrained())
d611c74f 2509 chi2Vals[1] = FitTiltedRiemanConstraint(&cseed[0], GetZ()); // Do Vertex Constrained fit if desired
2510 else
2511 chi2Vals[1] = 1.;
2512 chi2Vals[2] = GetChi2Z(&cseed[0]) / TMath::Max((mlayers - 3.), 1.);
2513 // Chi2 definitions in testing stage
2514 //chi2Vals[2] = GetChi2ZTest(&cseed[0]);
2515 fTrackQuality[ntracks] = CalculateTrackLikelihood(&cseed[0], &chi2Vals[0]);
2516 //AliInfo("Hyperplane fit done\n");
2517
2518 // finalize tracklets
2519 Int_t labels[12];
2520 Int_t outlab[24];
2521 Int_t nlab = 0;
2522 for (Int_t iLayer = 0; iLayer < 6; iLayer++) {
2523 if (!cseed[iLayer].IsOK()) continue;
2524
2525 if (cseed[iLayer].GetLabels(0) >= 0) {
2526 labels[nlab] = cseed[iLayer].GetLabels(0);
2527 nlab++;
2528 }
2529
2530 if (cseed[iLayer].GetLabels(1) >= 0) {
2531 labels[nlab] = cseed[iLayer].GetLabels(1);
2532 nlab++;
2533 }
2534 }
2535 Freq(nlab,labels,outlab,kFALSE);
2536 Int_t label = outlab[0];
2537 Int_t frequency = outlab[1];
2538 for (Int_t iLayer = 0; iLayer < 6; iLayer++) {
2539 cseed[iLayer].SetFreq(frequency);
2540 cseed[iLayer].SetChi2Z(chi2[1]);
2541 }
2542
3a039a31 2543 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){
d611c74f 2544 TTreeSRedirector &cstreamer = *fgDebugStreamer;
2545 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2546 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2547 TLinearFitter *fitterTC = GetTiltedRiemanFitterConstraint();
2548 TLinearFitter *fitterT = GetTiltedRiemanFitter();
91834b8d 2549 Int_t ncls = 0;
2550 for(Int_t iseed = 0; iseed < kNPlanes; iseed++){
2551 ncls += cseed[iseed].IsOK() ? cseed[iseed].GetN2() : 0;
2552 }
d611c74f 2553 cstreamer << "MakeSeeds2"
2554 << "EventNumber=" << eventNumber
2555 << "CandidateNumber=" << candidateNumber
2556 << "Chi2TR=" << chi2Vals[0]
2557 << "Chi2TC=" << chi2Vals[1]
2558 << "Nlayers=" << mlayers
91834b8d 2559 << "NClusters=" << ncls
d611c74f 2560 << "NUsedS=" << nUsedCl
2561 << "NUsed=" << nusedf
2562 << "Like=" << like
2563 << "S0.=" << &cseed[0]
2564 << "S1.=" << &cseed[1]
2565 << "S2.=" << &cseed[2]
2566 << "S3.=" << &cseed[3]
2567 << "S4.=" << &cseed[4]
2568 << "S5.=" << &cseed[5]
2569 << "Label=" << label
2570 << "Freq=" << frequency
2571 << "FitterT.=" << fitterT
2572 << "FitterTC.=" << fitterTC
2573 << "\n";
2574 }
2575
2576 ntracks++;
2577 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2578 if(ntracks == kMaxTracksStack){
2579 AliWarning(Form("Number of seeds reached maximum allowed (%d) in stack.", kMaxTracksStack));
2580 return ntracks;
2581 }
2582 cseed += 6;
41702fec 2583 }
2584 }
2585 }
41702fec 2586
2587 return ntracks;
e4f2f73d 2588}
2589
2590//_____________________________________________________________________________
0906e73e 2591AliTRDtrackV1* AliTRDtrackerV1::MakeTrack(AliTRDseedV1 *seeds, Double_t *params)
e4f2f73d 2592{
41702fec 2593 //
2594 // Build a TRD track out of tracklet candidates
2595 //
2596 // Parameters :
2597 // seeds : array of tracklets
2598 // params : track parameters (see MakeSeeds() function body for a detailed description)
2599 //
2600 // Output :
2601 // The TRD track.
2602 //
2603 // Detailed description
2604 //
2605 // To be discussed with Marian !!
2606 //
2607
41702fec 2608
2609 Double_t alpha = AliTRDgeometry::GetAlpha();
2610 Double_t shift = AliTRDgeometry::GetAlpha()/2.0;
2611 Double_t c[15];
2612
2613 c[ 0] = 0.2;
2614 c[ 1] = 0.0; c[ 2] = 2.0;
2615 c[ 3] = 0.0; c[ 4] = 0.0; c[ 5] = 0.02;
2616 c[ 6] = 0.0; c[ 7] = 0.0; c[ 8] = 0.0; c[ 9] = 0.1;
2617 c[10] = 0.0; c[11] = 0.0; c[12] = 0.0; c[13] = 0.0; c[14] = params[5]*params[5]*0.01;
2618
d20df6fc 2619 AliTRDtrackV1 track(seeds, &params[1], c, params[0], params[6]*alpha+shift);
2620 track.PropagateTo(params[0]-5.0);
91834b8d 2621 if(fReconstructor->IsHLT()){
2622 AliTRDseedV1 *ptrTracklet = 0x0;
2623 for(Int_t ip=0; ip<kNPlanes; ip++){
2624 track.UnsetTracklet(ip);
2625 ptrTracklet = SetTracklet(&seeds[ip]);
2626 track.SetTracklet(ptrTracklet, fTracklets->GetEntriesFast()-1);
2627 }
2628 return SetTrack(&track);
2629 }
393fda1c 2630
d20df6fc 2631 track.ResetCovariance(1);
e79f8eb0 2632 Int_t nc = TMath::Abs(FollowBackProlongation(track));
393fda1c 2633 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 5){
2634 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2635 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2636 Double_t p[5]; // Track Params for the Debug Stream
2637 track.GetExternalParameters(params[0], p);
2638 TTreeSRedirector &cs = *fgDebugStreamer;
2639 cs << "MakeTrack"
2640 << "EventNumber=" << eventNumber
2641 << "CandidateNumber=" << candidateNumber
2642 << "nc=" << nc
2643 << "X=" << params[0]
2644 << "Y=" << p[0]
2645 << "Z=" << p[1]
2646 << "snp=" << p[2]
2647 << "tnd=" << p[3]
2648 << "crv=" << p[4]
2649 << "Yin=" << params[1]
2650 << "Zin=" << params[2]
2651 << "snpin=" << params[3]
2652 << "tndin=" << params[4]
2653 << "crvin=" << params[5]
2654 << "track.=" << &track
2655 << "\n";
2656 }
d20df6fc 2657 if (nc < 30) return 0x0;
2658
2659 AliTRDtrackV1 *ptrTrack = SetTrack(&track);
215f7116 2660 ptrTrack->SetReconstructor(fReconstructor);
48f8adf3 2661 ptrTrack->CookLabel(.9);
24253b0a 2662
d20df6fc 2663 // computes PID for track
2664 ptrTrack->CookPID();
2665 // update calibration references using this track
48f8adf3 2666 AliTRDCalibraFillHisto *calibra = AliTRDCalibraFillHisto::Instance();
2667 if (!calibra){
2668 AliInfo("Could not get Calibra instance\n");
2669 if(calibra->GetHisto2d()) calibra->UpdateHistogramsV1(ptrTrack);
2670 }
d20df6fc 2671 return ptrTrack;
e4f2f73d 2672}
2673
0906e73e 2674
2675//____________________________________________________________________
eb38ed55 2676Int_t AliTRDtrackerV1::ImproveSeedQuality(AliTRDtrackingChamber **stack, AliTRDseedV1 *cseed)
e4f2f73d 2677{
41702fec 2678 //
2679 // Sort tracklets according to "quality" and try to "improve" the first 4 worst
2680 //
2681 // Parameters :
2682 // layers : Array of propagation layers for a stack/supermodule
2683 // cseed : Array of 6 seeding tracklets which has to be improved
2684 //
2685 // Output :
2686 // cssed : Improved seeds
2687 //
2688 // Detailed description
2689 //
2690 // Iterative procedure in which new clusters are searched for each
2691 // tracklet seed such that the seed quality (see AliTRDseed::GetQuality())
2692 // can be maximized. If some optimization is found the old seeds are replaced.
2693 //
2694 // debug level: 7
2695 //
2696
2697 // make a local working copy
2698 AliTRDtrackingChamber *chamber = 0x0;
2699 AliTRDseedV1 bseed[6];
2700 Int_t nLayers = 0;
2701 for (Int_t jLayer = 0; jLayer < 6; jLayer++) bseed[jLayer] = cseed[jLayer];
2702
2703 Float_t lastquality = 10000.0;
2704 Float_t lastchi2 = 10000.0;
2705 Float_t chi2 = 1000.0;
2706
2707 for (Int_t iter = 0; iter < 4; iter++) {
2708 Float_t sumquality = 0.0;
2709 Float_t squality[6];
2710 Int_t sortindexes[6];
2711
2712 for (Int_t jLayer = 0; jLayer < 6; jLayer++) {
3a039a31 2713 squality[jLayer] = bseed[jLayer].IsOK() ? bseed[jLayer].GetQuality(kTRUE) : 1000.;
41702fec 2714 sumquality += squality[jLayer];
2715 }
2716 if ((sumquality >= lastquality) || (chi2 > lastchi2)) break;
2717
2718 nLayers = 0;
2719 lastquality = sumquality;
2720 lastchi2 = chi2;
2721 if (iter > 0) for (Int_t jLayer = 0; jLayer < 6; jLayer++) cseed[jLayer] = bseed[jLayer];
2722
2723 TMath::Sort(6, squality, sortindexes, kFALSE);
2724 for (Int_t jLayer = 5; jLayer > 1; jLayer--) {
2725 Int_t bLayer = sortindexes[jLayer];
2726 if(!(chamber = stack[bLayer])) continue;
2727 bseed[bLayer].AttachClustersIter(chamber, squality[bLayer], kTRUE);
2728 if(bseed[bLayer].IsOK()) nLayers++;
2729 }
2730
2731 chi2 = FitTiltedRieman(bseed, kTRUE);
3a039a31 2732 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 7){
41702fec 2733 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2734 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2735 TLinearFitter *tiltedRieman = GetTiltedRiemanFitter();
2736 TTreeSRedirector &cstreamer = *fgDebugStreamer;
2737 cstreamer << "ImproveSeedQuality"
2738 << "EventNumber=" << eventNumber
2739 << "CandidateNumber=" << candidateNumber
2740 << "Iteration=" << iter
2741 << "S0.=" << &bseed[0]
2742 << "S1.=" << &bseed[1]
2743 << "S2.=" << &bseed[2]
2744 << "S3.=" << &bseed[3]
2745 << "S4.=" << &bseed[4]
2746 << "S5.=" << &bseed[5]
2747 << "FitterT.=" << tiltedRieman
2748 << "\n";
2749 }
2750 } // Loop: iter
2751
2752 // we are sure that at least 2 tracklets are OK !
2753 return nLayers+2;
e4f2f73d 2754}
2755
eb38ed55 2756//_________________________________________________________________________
2757Double_t AliTRDtrackerV1::CalculateTrackLikelihood(AliTRDseedV1 *tracklets, Double_t *chi2){
41702fec 2758 //
2759 // Calculates the Track Likelihood value. This parameter serves as main quality criterion for
2760 // the track selection
2761 // The likelihood value containes:
2762 // - The chi2 values from the both fitters and the chi2 values in z-direction from a linear fit
2763 // - The Sum of the Parameter |slope_ref - slope_fit|/Sigma of the tracklets
2764 // For all Parameters an exponential dependency is used
2765 //
2766 // Parameters: - Array of tracklets (AliTRDseedV1) related to the track candidate
2767 // - Array of chi2 values:
2768 // * Non-Constrained Tilted Riemann fit
2769 // * Vertex-Constrained Tilted Riemann fit
2770 // * z-Direction from Linear fit
2771 // Output: - The calculated track likelihood
2772 //
2773 // debug level 2
2774 //
2775
2776 Double_t sumdaf = 0, nLayers = 0;
2777 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
2778 if(!tracklets[iLayer].IsOK()) continue;
2779 sumdaf += TMath::Abs((tracklets[iLayer].GetYfit(1) - tracklets[iLayer].GetYref(1))/ tracklets[iLayer].GetSigmaY2());
2780 nLayers++;
2781 }
2782 sumdaf /= Float_t (nLayers - 2.0);
2783
2784 Double_t likeChi2Z = TMath::Exp(-chi2[2] * 0.14); // Chi2Z
3a039a31 2785 Double_t likeChi2TC = (fReconstructor->GetRecoParam() ->IsVertexConstrained()) ?
d20df6fc 2786 TMath::Exp(-chi2[1] * 0.677) : 1; // Constrained Tilted Riemann
41702fec 2787 Double_t likeChi2TR = TMath::Exp(-chi2[0] * 0.78); // Non-constrained Tilted Riemann
2788 Double_t likeAF = TMath::Exp(-sumdaf * 3.23);
2789 Double_t trackLikelihood = likeChi2Z * likeChi2TR * likeAF;
2790
3a039a31 2791 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){
41702fec 2792 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2793 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2794 TTreeSRedirector &cstreamer = *fgDebugStreamer;
2795 cstreamer << "CalculateTrackLikelihood0"
2796 << "EventNumber=" << eventNumber
2797 << "CandidateNumber=" << candidateNumber
2798 << "LikeChi2Z=" << likeChi2Z
2799 << "LikeChi2TR=" << likeChi2TR
2800 << "LikeChi2TC=" << likeChi2TC
2801 << "LikeAF=" << likeAF
2802 << "TrackLikelihood=" << trackLikelihood
2803 << "\n";
2804 }
2805
2806 return trackLikelihood;
e4f2f73d 2807}
2808
2809//____________________________________________________________________
91834b8d 2810Double_t AliTRDtrackerV1::CookLikelihood(AliTRDseedV1 *cseed, Int_t planes[4])
e4f2f73d 2811{
41702fec 2812 //
2813 // Calculate the probability of this track candidate.
2814 //
2815 // Parameters :
2816 // cseeds : array of candidate tracklets
2817 // planes : array of seeding planes (see seeding configuration)
2818 // chi2 : chi2 values (on the Z and Y direction) from the rieman fit of the track.
2819 //
2820 // Output :
2821 // likelihood value
2822 //
2823 // Detailed description
2824 //
2825 // The track quality is estimated based on the following 4 criteria:
2826 // 1. precision of the rieman fit on the Y direction (likea)
2827 // 2. chi2 on the Y direction (likechi2y)
2828 // 3. chi2 on the Z direction (likechi2z)
2829 // 4. number of attached clusters compared to a reference value
2830 // (see AliTRDrecoParam::fkFindable) (likeN)
2831 //
2832 // The distributions for each type of probabilities are given below as of
2833 // (date). They have to be checked to assure consistency of estimation.
2834 //
2835
2836 // ratio of the total number of clusters/track which are expected to be found by the tracker.
91834b8d 2837 const AliTRDrecoParam *fRecoPars = fReconstructor->GetRecoParam();
41702fec 2838
91834b8d 2839 Double_t chi2y = GetChi2Y(&cseed[0]);
2840 Double_t chi2z = GetChi2Z(&cseed[0]);
2841
8ae98148 2842 Float_t nclusters = 0.;
41702fec 2843 Double_t sumda = 0.;
2844 for(UChar_t ilayer = 0; ilayer < 4; ilayer++){
2845 Int_t jlayer = planes[ilayer];
2846 nclusters += cseed[jlayer].GetN2();
2847 sumda += TMath::Abs(cseed[jlayer].GetYfitR(1) - cseed[jlayer].GetYref(1));
2848 }
8ae98148 2849 nclusters *= .25;
2850
91834b8d 2851 Double_t likea = TMath::Exp(-sumda * fRecoPars->GetPhiCut());
41702fec 2852 Double_t likechi2y = 0.0000000001;
91834b8d 2853 if (fReconstructor->IsCosmic() || chi2y < 0.5) likechi2y += TMath::Exp(-TMath::Sqrt(chi2y) * fRecoPars->GetChi2YCut());
2854 Double_t likechi2z = TMath::Exp(-chi2z * fRecoPars->GetChi2ZCut());
8ae98148 2855 Double_t likeN = TMath::Exp(-(fRecoPars->GetNMeanClusters() - nclusters) / fRecoPars->GetNSigmaClusters());
41702fec 2856 Double_t like = likea * likechi2y * likechi2z * likeN;
2857
2858 // 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 2859 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){
41702fec 2860 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2861 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
91834b8d 2862 Int_t nTracklets = 0; Float_t mean_ncls = 0;
2863 for(Int_t iseed=0; iseed < kNPlanes; iseed++){
2864 if(!cseed[iseed].IsOK()) continue;
2865 nTracklets++;
2866 mean_ncls += cseed[iseed].GetN2();
2867 }
2868 if(nTracklets) mean_ncls /= nTracklets;
41702fec 2869 // The Debug Stream contains the seed
2870 TTreeSRedirector &cstreamer = *fgDebugStreamer;
2871 cstreamer << "CookLikelihood"
2872 << "EventNumber=" << eventNumber
2873 << "CandidateNumber=" << candidateNumber
2874 << "tracklet0.=" << &cseed[0]
2875 << "tracklet1.=" << &cseed[1]
2876 << "tracklet2.=" << &cseed[2]
2877 << "tracklet3.=" << &cseed[3]
2878 << "tracklet4.=" << &cseed[4]
2879 << "tracklet5.=" << &cseed[5]
2880 << "sumda=" << sumda
91834b8d 2881 << "chi2y=" << chi2y
2882 << "chi2z=" << chi2z
41702fec 2883 << "likea=" << likea
2884 << "likechi2y=" << likechi2y
2885 << "likechi2z=" << likechi2z
2886 << "nclusters=" << nclusters
2887 << "likeN=" << likeN
2888 << "like=" << like
91834b8d 2889 << "meanncls=" << mean_ncls
41702fec 2890 << "\n";
2891 }
2892
2893 return like;
e4f2f73d 2894}
2895
eb38ed55 2896
e4f2f73d 2897
2898//____________________________________________________________________
0906e73e 2899void AliTRDtrackerV1::GetSeedingConfig(Int_t iconfig, Int_t planes[4])
e4f2f73d 2900{
41702fec 2901 //
2902 // Map seeding configurations to detector planes.
2903 //
2904 // Parameters :
2905 // iconfig : configuration index
2906 // planes : member planes of this configuration. On input empty.
2907 //
2908 // Output :
2909 // planes : contains the planes which are defining the configuration
2910 //
2911 // Detailed description
2912 //
2913 // Here is the list of seeding planes configurations together with
2914 // their topological classification:
2915 //
2916 // 0 - 5432 TQ 0
2917 // 1 - 4321 TQ 0
2918 // 2 - 3210 TQ 0
2919 // 3 - 5321 TQ 1
2920 // 4 - 4210 TQ 1
2921 // 5 - 5431 TQ 1
2922 // 6 - 4320 TQ 1
2923 // 7 - 5430 TQ 2
2924 // 8 - 5210 TQ 2
2925 // 9 - 5421 TQ 3
2926 // 10 - 4310 TQ 3
2927 // 11 - 5410 TQ 4
2928 // 12 - 5420 TQ 5
2929 // 13 - 5320 TQ 5
2930 // 14 - 5310 TQ 5
2931 //
2932 // The topologic quality is modeled as follows:
2933 // 1. The general model is define by the equation:
2934 // p(conf) = exp(-conf/2)
2935 // 2. According to the topologic classification, configurations from the same
2936 // class are assigned the agerage value over the model values.
2937 // 3. Quality values are normalized.
2938 //
2939 // The topologic quality distribution as function of configuration is given below:
2940 //Begin_Html
2941 // <img src="gif/topologicQA.gif">
2942 //End_Html
2943 //
2944
2945 switch(iconfig){
2946 case 0: // 5432 TQ 0
2947 planes[0] = 2;
2948 planes[1] = 3;
2949 planes[2] = 4;
2950 planes[3] = 5;
2951 break;
2952 case 1: // 4321 TQ 0
2953 planes[0] = 1;
2954 planes[1] = 2;
2955 planes[2] = 3;
2956 planes[3] = 4;
2957 break;
2958 case 2: // 3210 TQ 0
2959 planes[0] = 0;
2960 planes[1] = 1;
2961 planes[2] = 2;
2962 planes[3] = 3;
2963 break;
2964 case 3: // 5321 TQ 1
2965 planes[0] = 1;
2966 planes[1] = 2;
2967 planes[2] = 3;
2968 planes[3] = 5;
2969 break;
2970 case 4: // 4210 TQ 1
2971 planes[0] = 0;
2972 planes[1] = 1;
2973 planes[2] = 2;
2974 planes[3] = 4;
2975 break;
2976 case 5: // 5431 TQ 1
2977 planes[0] = 1;
2978 planes[1] = 3;
2979 planes[2] = 4;
2980 planes[3] = 5;
2981 break;
2982 case 6: // 4320 TQ 1
2983 planes[0] = 0;
2984 planes[1] = 2;
2985 planes[2] = 3;
2986 planes[3] = 4;
2987 break;
2988 case 7: // 5430 TQ 2
2989 planes[0] = 0;
2990 planes[1] = 3;
2991 planes[2] = 4;
2992 planes[3] = 5;
2993 break;
2994 case 8: // 5210 TQ 2
2995 planes[0] = 0;
2996 planes[1] = 1;
2997 planes[2] = 2;
2998 planes[3] = 5;
2999 break;
3000 case 9: // 5421 TQ 3
3001 planes[0] = 1;
3002 planes[1] = 2;
3003 planes[2] = 4;
3004 planes[3] = 5;
3005 break;
3006 case 10: // 4310 TQ 3
3007 planes[0] = 0;
3008 planes[1] = 1;
3009 planes[2] = 3;
3010 planes[3] = 4;
3011 break;
3012 case 11: // 5410 TQ 4
3013 planes[0] = 0;
3014 planes[1] = 1;
3015 planes[2] = 4;
3016 planes[3] = 5;
3017 break;
3018 case 12: // 5420 TQ 5
3019 planes[0] = 0;
3020 planes[1] = 2;
3021 planes[2] = 4;
3022 planes[3] = 5;
3023 break;
3024 case 13: // 5320 TQ 5
3025 planes[0] = 0;
3026 planes[1] = 2;
3027 planes[2] = 3;
3028 planes[3] = 5;
3029 break;
3030 case 14: // 5310 TQ 5
3031 planes[0] = 0;
3032 planes[1] = 1;
3033 planes[2] = 3;
3034 planes[3] = 5;
3035 break;
3036 }
e4f2f73d 3037}
3038
3039//____________________________________________________________________
0906e73e 3040void AliTRDtrackerV1::GetExtrapolationConfig(Int_t iconfig, Int_t planes[2])
e4f2f73d 3041{
41702fec 3042 //
3043 // Returns the extrapolation planes for a seeding configuration.
3044 //
3045 // Parameters :
3046 // iconfig : configuration index
3047 // planes : planes which are not in this configuration. On input empty.
3048 //
3049 // Output :
3050 // planes : contains the planes which are not in the configuration
3051 //
3052 // Detailed description
3053 //
3054
3055 switch(iconfig){
3056 case 0: // 5432 TQ 0
3057 planes[0] = 1;
3058 planes[1] = 0;
3059 break;
3060 case 1: // 4321 TQ 0
3061 planes[0] = 5;
3062 planes[1] = 0;
3063 break;
3064 case 2: // 3210 TQ 0
3065 planes[0] = 4;
3066 planes[1] = 5;
3067 break;
3068 case 3: // 5321 TQ 1
3069 planes[0] = 4;
3070 planes[1] = 0;
3071 break;
3072 case 4: // 4210 TQ 1
3073 planes[0] = 5;
3074 planes[1] = 3;
3075 break;
3076 case 5: // 5431 TQ 1
3077 planes[0] = 2;
3078 planes[1] = 0;
3079 break;
3080 case 6: // 4320 TQ 1
3081 planes[0] = 5;
3082 planes[1] = 1;
3083 break;
3084 case 7: // 5430 TQ 2
3085 planes[0] = 2;
3086 planes[1] = 1;
3087 break;
3088 case 8: // 5210 TQ 2
3089 planes[0] = 4;
3090 planes[1] = 3;
3091 break;
3092 case 9: // 5421 TQ 3
3093 planes[0] = 3;
3094 planes[1] = 0;
3095 break;
3096 case 10: // 4310 TQ 3
3097 planes[0] = 5;
3098 planes[1] = 2;
3099 break;
3100 case 11: // 5410 TQ 4
3101 planes[0] = 3;
3102 planes[1] = 2;
3103 break;
3104 case 12: // 5420 TQ 5
3105 planes[0] = 3;
3106 planes[1] = 1;
3107 break;
3108 case 13: // 5320 TQ 5
3109 planes[0] = 4;
3110 planes[1] = 1;
3111 break;
3112 case 14: // 5310 TQ 5
3113 planes[0] = 4;
3114 planes[1] = 2;
3115 break;
3116 }
e4f2f73d 3117}
eb38ed55 3118
3119//____________________________________________________________________
3120AliCluster* AliTRDtrackerV1::GetCluster(Int_t idx) const
3121{
41702fec 3122 Int_t ncls = fClusters->GetEntriesFast();
2f7514a6 3123 return idx >= 0 && idx < ncls ? (AliCluster*)fClusters->UncheckedAt(idx) : 0x0;
eb38ed55 3124}
3125
bb56afff 3126//____________________________________________________________________
3b57a3f7 3127AliTRDseedV1* AliTRDtrackerV1::GetTracklet(Int_t idx) const
3128{
41702fec 3129 Int_t ntrklt = fTracklets->GetEntriesFast();
2f7514a6 3130 return idx >= 0 && idx < ntrklt ? (AliTRDseedV1*)fTracklets->UncheckedAt(idx) : 0x0;
3b57a3f7 3131}
3132
3133//____________________________________________________________________
3134AliKalmanTrack* AliTRDtrackerV1::GetTrack(Int_t idx) const
3135{
41702fec 3136 Int_t ntrk = fTracks->GetEntriesFast();
2f7514a6 3137 return idx >= 0 && idx < ntrk ? (AliKalmanTrack*)fTracks->UncheckedAt(idx) : 0x0;
3b57a3f7 3138}
3139
3140//____________________________________________________________________
bb56afff 3141Float_t AliTRDtrackerV1::CalculateReferenceX(AliTRDseedV1 *tracklets){
41702fec 3142 //
3143 // Calculates the reference x-position for the tilted Rieman fit defined as middle
3144 // of the stack (middle between layers 2 and 3). For the calculation all the tracklets
3145 // are taken into account
3146 //
3147 // Parameters: - Array of tracklets(AliTRDseedV1)
3148 //
3149 // Output: - The reference x-position(Float_t)
3150 //
3151 Int_t nDistances = 0;
3152 Float_t meanDistance = 0.;
3153 Int_t startIndex = 5;
3154 for(Int_t il =5; il > 0; il--){
3155 if(tracklets[il].IsOK() && tracklets[il -1].IsOK()){
3156 Float_t xdiff = tracklets[il].GetX0() - tracklets[il -1].GetX0();
3157 meanDistance += xdiff;
3158 nDistances++;
3159 }
3160 if(tracklets[il].IsOK()) startIndex = il;
3161 }
3162 if(tracklets[0].IsOK()) startIndex = 0;
3163 if(!nDistances){
3164 // We should normally never get here
3165 Float_t xpos[2]; memset(xpos, 0, sizeof(Float_t) * 2);
3166 Int_t iok = 0, idiff = 0;
3167 // This attempt is worse and should be avoided:
3168 // check for two chambers which are OK and repeat this without taking the mean value
3169 // Strategy avoids a division by 0;
3170 for(Int_t il = 5; il >= 0; il--){
3171 if(tracklets[il].IsOK()){
3172 xpos[iok] = tracklets[il].GetX0();
3173 iok++;
3174 startIndex = il;
3175 }
3176 if(iok) idiff++; // to get the right difference;
3177 if(iok > 1) break;
3178 }
3179 if(iok > 1){
3180 meanDistance = (xpos[0] - xpos[1])/idiff;
3181 }
3182 else{
3183 // we have do not even have 2 layers which are OK? The we do not need to fit at all
3184 return 331.;
3185 }
3186 }
3187 else{
3188 meanDistance /= nDistances;
3189 }
3190 return tracklets[startIndex].GetX0() + (2.5 - startIndex) * meanDistance - 0.5 * (AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick());
bb56afff 3191}
eb38ed55 3192
3193//_____________________________________________________________________________
3194Int_t AliTRDtrackerV1::Freq(Int_t n, const Int_t *inlist
41702fec 3195 , Int_t *outlist, Bool_t down)
eb38ed55 3196{
41702fec 3197 //
3198 // Sort eleements according occurancy
3199 // The size of output array has is 2*n
3200 //
3201
3202 if (n <= 0) {
3203 return 0;
3204 }
3205
3206 Int_t *sindexS = new Int_t[n]; // Temporary array for sorting
3207 Int_t *sindexF = new Int_t[2*n];
3208 for (Int_t i = 0; i < n; i++) {
3209 sindexF[i] = 0;
3210 }
3211
3212 TMath::Sort(n,inlist,sindexS,down);
3213
3214 Int_t last = inlist[sindexS[0]];
3215 Int_t val = last;
3216 sindexF[0] = 1;
3217 sindexF[0+n] = last;
3218 Int_t countPos = 0;
3219
3220 // Find frequency
3221 for (Int_t i = 1; i < n; i++) {
3222 val = inlist[sindexS[i]];
3223 if (last == val) {
3224 sindexF[countPos]++;
3225 }
3226 else {
3227 countPos++;
3228 sindexF[countPos+n] = val;
3229 sindexF[countPos]++;
3230 last = val;
3231 }
3232 }
3233 if (last == val) {
3234 countPos++;
3235 }
3236
3237 // Sort according frequency
3238 TMath::Sort(countPos,sindexF,sindexS,kTRUE);
3239
3240 for (Int_t i = 0; i < countPos; i++) {
3241 outlist[2*i ] = sindexF[sindexS[i]+n];
3242 outlist[2*i+1] = sindexF[sindexS[i]];
3243 }
3244
3245 delete [] sindexS;
3246 delete [] sindexF;
3247
3248 return countPos;
eb38ed55 3249
3250}
bb56afff 3251
06b32d95 3252
3253//____________________________________________________________________
3254void AliTRDtrackerV1::SetReconstructor(const AliTRDReconstructor *rec)
3255{
3256 fReconstructor = rec;
3257 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){
3258 if(!fgDebugStreamer){
3259 TDirectory *savedir = gDirectory;
3260 fgDebugStreamer = new TTreeSRedirector("TRD.TrackerDebug.root");
3261 savedir->cd();
3262 }
3263 }
acd241e9 3264}
3265
bb56afff 3266//_____________________________________________________________________________
3267Float_t AliTRDtrackerV1::GetChi2Y(AliTRDseedV1 *tracklets) const
3268{
41702fec 3269 // Chi2 definition on y-direction
3270
3271 Float_t chi2 = 0;
3272 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
3273 if(!tracklets[ipl].IsOK()) continue;
91834b8d 3274 Double_t distLayer = (tracklets[ipl].GetYfit(0) - tracklets[ipl].GetYref(0));// /tracklets[ipl].GetSigmaY();
41702fec 3275 chi2 += distLayer * distLayer;
3276 }
3277 return chi2;
bb56afff 3278}
3279
d611c74f 3280//____________________________________________________________________
3281void AliTRDtrackerV1::ResetSeedTB()
3282{
3283// reset buffer for seeding time bin layers. If the time bin
3284// layers are not allocated this function allocates them
3285
3286 for(Int_t isl=0; isl<kNSeedPlanes; isl++){
3287 if(!fSeedTB[isl]) fSeedTB[isl] = new AliTRDchamberTimeBin();
3288 else fSeedTB[isl]->Clear();
3289 }
3290}
3291
bb56afff 3292//_____________________________________________________________________________
3293Float_t AliTRDtrackerV1::GetChi2Z(AliTRDseedV1 *tracklets) const
3294{
91834b8d 3295 // Calculates normalized chi2 in z-direction
41702fec 3296
3297 Float_t chi2 = 0;
91834b8d 3298 // chi2 = Sum ((z - zmu)/sigma)^2
3299 // Sigma for the z direction is defined as half of the padlength
41702fec 3300 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
3301 if(!tracklets[ipl].IsOK()) continue;
91834b8d 3302 Double_t distLayer = (tracklets[ipl].GetMeanz() - tracklets[ipl].GetZref(0)); // /(tracklets[ipl].GetPadLength()/2);
41702fec 3303 chi2 += distLayer * distLayer;
3304 }
3305 return chi2;
bb56afff 3306}
8acca6a3 3307
3308///////////////////////////////////////////////////////
3309// //
3310// Resources of class AliTRDLeastSquare //
3311// //
3312///////////////////////////////////////////////////////
3313
3314//_____________________________________________________________________________
3315AliTRDtrackerV1::AliTRDLeastSquare::AliTRDLeastSquare(){
41702fec 3316 //
3317 // Constructor of the nested class AliTRDtrackFitterLeastSquare
3318 //
3319 memset(fParams, 0, sizeof(Double_t) * 2);
3320 memset(fSums, 0, sizeof(Double_t) * 5);
3321 memset(fCovarianceMatrix, 0, sizeof(Double_t) * 3);
8acca6a3 3322
3323}
3324
3325//_____________________________________________________________________________
3326void AliTRDtrackerV1::AliTRDLeastSquare::AddPoint(Double_t *x, Double_t y, Double_t sigmaY){
41702fec 3327 //
3328 // Adding Point to the fitter
3329 //
3330 Double_t weight = 1/(sigmaY * sigmaY);
3331 Double_t &xpt = *x;
3332 // printf("Adding point x = %f, y = %f, sigma = %f\n", xpt, y, sigmaY);
3333 fSums[0] += weight;
3334 fSums[1] += weight * xpt;
3335 fSums[2] += weight * y;
3336 fSums[3] += weight * xpt * y;
3337 fSums[4] += weight * xpt * xpt;
3338 fSums[5] += weight * y * y;
8acca6a3 3339}
3340
3341//_____________________________________________________________________________
3342void AliTRDtrackerV1::AliTRDLeastSquare::RemovePoint(Double_t *x, Double_t y, Double_t sigmaY){
41702fec 3343 //
3344 // Remove Point from the sample
3345 //
3346 Double_t weight = 1/(sigmaY * sigmaY);
3347 Double_t &xpt = *x;
3348 fSums[0] -= weight;
3349 fSums[1] -= weight * xpt;
3350 fSums[2] -= weight * y;
3351 fSums[3] -= weight * xpt * y;
3352 fSums[4] -= weight * xpt * xpt;
3353 fSums[5] -= weight * y * y;
8acca6a3 3354}
3355
3356//_____________________________________________________________________________
3357void AliTRDtrackerV1::AliTRDLeastSquare::Eval(){
41702fec 3358 //
3359 // Evaluation of the fit:
3360 // Calculation of the parameters
3361 // Calculation of the covariance matrix
3362 //
3363
3364 Double_t denominator = fSums[0] * fSums[4] - fSums[1] *fSums[1];
aec26713 3365 if(denominator==0) return;
3366
41702fec 3367 // for(Int_t isum = 0; isum < 5; isum++)
3368 // printf("fSums[%d] = %f\n", isum, fSums[isum]);
3369 // printf("denominator = %f\n", denominator);
3370 fParams[0] = (fSums[2] * fSums[4] - fSums[1] * fSums[3])/ denominator;
3371 fParams[1] = (fSums[0] * fSums[3] - fSums[1] * fSums[2]) / denominator;
3372 // printf("fParams[0] = %f, fParams[1] = %f\n", fParams[0], fParams[1]);
3373
3374 // Covariance matrix
3375 fCovarianceMatrix[0] = fSums[4] - fSums[1] * fSums[1] / fSums[0];
3376 fCovarianceMatrix[1] = fSums[5] - fSums[2] * fSums[2] / fSums[0];
3377 fCovarianceMatrix[2] = fSums[3] - fSums[1] * fSums[2] / fSums[0];
8acca6a3 3378}
3379
46b6abd7 3380//_____________________________________________________________________________
3381Double_t AliTRDtrackerV1::AliTRDLeastSquare::GetFunctionValue(Double_t *xpos) const {
41702fec 3382 //
3383 // Returns the Function value of the fitted function at a given x-position
3384 //
3385 return fParams[0] + fParams[1] * (*xpos);
46b6abd7 3386}
3387
3388//_____________________________________________________________________________
3389void AliTRDtrackerV1::AliTRDLeastSquare::GetCovarianceMatrix(Double_t *storage) const {
41702fec 3390 //
3391 // Copies the values of the covariance matrix into the storage
3392 //
3393 memcpy(storage, fCovarianceMatrix, sizeof(Double_t) * 3);
46b6abd7 3394}
3395