Minor fix to make vertices with SPD outer and SDD inner (A. Dainese)
[u/mrichter/AliRoot.git] / TRD / AliTRDtrackerV1.cxx
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bcb6fb78 1
e4f2f73d 2/**************************************************************************
972ef65e 3* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4* *
5* Author: The ALICE Off-line Project. *
6* Contributors are mentioned in the code where appropriate. *
7* *
8* Permission to use, copy, modify and distribute this software and its *
9* documentation strictly for non-commercial purposes is hereby granted *
10* without fee, provided that the above copyright notice appears in all *
11* copies and that both the copyright notice and this permission notice *
12* appear in the supporting documentation. The authors make no claims *
13* about the suitability of this software for any purpose. It is *
14* provided "as is" without express or implied warranty. *
15**************************************************************************/
e4f2f73d 16
17/* $Id$ */
18
19///////////////////////////////////////////////////////////////////////////////
20// //
21// Track finder //
22// //
23// Authors: //
24// Alex Bercuci <A.Bercuci@gsi.de> //
25// Markus Fasel <M.Fasel@gsi.de> //
26// //
27///////////////////////////////////////////////////////////////////////////////
28
bb56afff 29// #include <Riostream.h>
30// #include <stdio.h>
31// #include <string.h>
e4f2f73d 32
33#include <TBranch.h>
bb56afff 34#include <TDirectory.h>
e4f2f73d 35#include <TLinearFitter.h>
e4f2f73d 36#include <TTree.h>
37#include <TClonesArray.h>
e4f2f73d 38#include <TTreeStream.h>
39
40#include "AliLog.h"
41#include "AliESDEvent.h"
bb56afff 42#include "AliGeomManager.h"
e4f2f73d 43#include "AliRieman.h"
44#include "AliTrackPointArray.h"
45
e4f2f73d 46#include "AliTRDgeometry.h"
47#include "AliTRDpadPlane.h"
e4f2f73d 48#include "AliTRDcalibDB.h"
e4f2f73d 49#include "AliTRDReconstructor.h"
50#include "AliTRDCalibraFillHisto.h"
e4f2f73d 51#include "AliTRDrecoParam.h"
bb56afff 52
53#include "AliTRDcluster.h"
e4f2f73d 54#include "AliTRDseedV1.h"
0906e73e 55#include "AliTRDtrackV1.h"
bb56afff 56#include "AliTRDtrackerV1.h"
57#include "AliTRDtrackerDebug.h"
58#include "AliTRDtrackingChamber.h"
59#include "AliTRDchamberTimeBin.h"
60
e4f2f73d 61
e4f2f73d 62
63ClassImp(AliTRDtrackerV1)
eb38ed55 64
65
66const Float_t AliTRDtrackerV1::fgkMinClustersInTrack = 0.5; //
67const Float_t AliTRDtrackerV1::fgkLabelFraction = 0.8; //
68const Double_t AliTRDtrackerV1::fgkMaxChi2 = 12.0; //
69const Double_t AliTRDtrackerV1::fgkMaxSnp = 0.95; // Maximum local sine of the azimuthal angle
70const Double_t AliTRDtrackerV1::fgkMaxStep = 2.0; // Maximal step size in propagation
d76231c8 71Double_t AliTRDtrackerV1::fgTopologicQA[kNConfigs] = {
41702fec 72 0.1112, 0.1112, 0.1112, 0.0786, 0.0786,
73 0.0786, 0.0786, 0.0579, 0.0579, 0.0474,
74 0.0474, 0.0408, 0.0335, 0.0335, 0.0335
e4f2f73d 75};
2985ffcb 76Int_t AliTRDtrackerV1::fgNTimeBins = 0;
eb38ed55 77TTreeSRedirector *AliTRDtrackerV1::fgDebugStreamer = 0x0;
78AliRieman* AliTRDtrackerV1::fgRieman = 0x0;
79TLinearFitter* AliTRDtrackerV1::fgTiltedRieman = 0x0;
80TLinearFitter* AliTRDtrackerV1::fgTiltedRiemanConstrained = 0x0;
e4f2f73d 81
82//____________________________________________________________________
3a039a31 83AliTRDtrackerV1::AliTRDtrackerV1(AliTRDReconstructor *rec)
41702fec 84 :AliTracker()
06b32d95 85 ,fReconstructor(0x0)
41702fec 86 ,fGeom(new AliTRDgeometry())
87 ,fClusters(0x0)
88 ,fTracklets(0x0)
89 ,fTracks(0x0)
90 ,fSieveSeeding(0)
e4f2f73d 91{
41702fec 92 //
93 // Default constructor.
94 //
a7ac01d2 95 AliTRDcalibDB *trd = 0x0;
96 if (!(trd = AliTRDcalibDB::Instance())) {
41702fec 97 AliFatal("Could not get calibration object");
98 }
a7ac01d2 99
100 if(!fgNTimeBins) fgNTimeBins = trd->GetNumberOfTimeBins();
41702fec 101
053767a4 102 for (Int_t isector = 0; isector < AliTRDgeometry::kNsector; isector++) new(&fTrSec[isector]) AliTRDtrackingSector(fGeom, isector);
3a039a31 103
d611c74f 104 for(Int_t isl =0; isl<kNSeedPlanes; isl++) fSeedTB[isl] = 0x0;
d20df6fc 105
3a039a31 106 // Initialize debug stream
06b32d95 107 if(rec) SetReconstructor(rec);
eb38ed55 108}
109
e4f2f73d 110//____________________________________________________________________
111AliTRDtrackerV1::~AliTRDtrackerV1()
112{
41702fec 113 //
114 // Destructor
115 //
116
117 if(fgDebugStreamer) delete fgDebugStreamer;
118 if(fgRieman) delete fgRieman;
119 if(fgTiltedRieman) delete fgTiltedRieman;
120 if(fgTiltedRiemanConstrained) delete fgTiltedRiemanConstrained;
d611c74f 121 for(Int_t isl =0; isl<kNSeedPlanes; isl++) if(fSeedTB[isl]) delete fSeedTB[isl];
41702fec 122 if(fTracks) {fTracks->Delete(); delete fTracks;}
123 if(fTracklets) {fTracklets->Delete(); delete fTracklets;}
48f8adf3 124 if(fClusters) {
125 fClusters->Delete(); delete fClusters;
126 }
41702fec 127 if(fGeom) delete fGeom;
e4f2f73d 128}
129
130//____________________________________________________________________
131Int_t AliTRDtrackerV1::Clusters2Tracks(AliESDEvent *esd)
132{
41702fec 133 //
134 // Steering stand alone tracking for full TRD detector
135 //
136 // Parameters :
137 // esd : The ESD event. On output it contains
138 // the ESD tracks found in TRD.
139 //
140 // Output :
141 // Number of tracks found in the TRD detector.
142 //
143 // Detailed description
144 // 1. Launch individual SM trackers.
145 // See AliTRDtrackerV1::Clusters2TracksSM() for details.
146 //
147
3a039a31 148 if(!fReconstructor->GetRecoParam() ){
149 AliError("Reconstruction configuration not initialized. Call first AliTRDReconstructor::SetRecoParam().");
41702fec 150 return 0;
151 }
152
153 //AliInfo("Start Track Finder ...");
154 Int_t ntracks = 0;
053767a4 155 for(int ism=0; ism<AliTRDgeometry::kNsector; ism++){
41702fec 156 // for(int ism=1; ism<2; ism++){
157 //AliInfo(Form("Processing supermodule %i ...", ism));
158 ntracks += Clusters2TracksSM(ism, esd);
159 }
160 AliInfo(Form("Number of found tracks : %d", ntracks));
161 return ntracks;
e4f2f73d 162}
163
0906e73e 164
165//_____________________________________________________________________________
eb38ed55 166Bool_t AliTRDtrackerV1::GetTrackPoint(Int_t index, AliTrackPoint &p) const
0906e73e 167{
41702fec 168 //AliInfo(Form("Asking for tracklet %d", index));
169
2f7514a6 170 AliTRDseedV1 *tracklet = GetTracklet(index);
171 if (!tracklet) return kFALSE;
41702fec 172
173 // get detector for this tracklet
174 AliTRDcluster *cl = 0x0;
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
307 if ((track.GetNumberOfClusters() > 15) && (track.GetNumberOfClusters() > 0.5*expectedClr)) {
308 seed->UpdateTrackParams(&track, AliESDtrack::kTRDout);
309
310 track.UpdateESDtrack(seed);
311
312 // Add TRD track to ESDfriendTrack
3a039a31 313 if (fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 0 /*&& quality TODO*/){
41702fec 314 AliTRDtrackV1 *calibTrack = new AliTRDtrackV1(track);
315 calibTrack->SetOwner();
316 seed->AddCalibObject(calibTrack);
317 }
318 }
319 }
320
321 if ((TMath::Abs(track.GetC() - p4) / TMath::Abs(p4) < 0.2) ||(track.Pt() > 0.8)) {
322 //
323 // Make backup for back propagation
324 //
325 Int_t foundClr = track.GetNumberOfClusters();
326 if (foundClr >= foundMin) {
327 //AliInfo(Form("Making backup track ncls [%d]...", foundClr));
328 //track.CookdEdx();
329 //track.CookdEdxTimBin(seed->GetID());
330 track.CookLabel(1. - fgkLabelFraction);
331 if(track.GetBackupTrack()) UseClusters(track.GetBackupTrack());
41702fec 332
333 // Sign only gold tracks
334 if (track.GetChi2() / track.GetNumberOfClusters() < 4) {
76b60503 335 if ((seed->GetKinkIndex(0) == 0) && (track.Pt() < 1.5)){
336 //UseClusters(&track);
337 }
41702fec 338 }
339 Bool_t isGold = kFALSE;
340
341 // Full gold track
342 if (track.GetChi2() / track.GetNumberOfClusters() < 5) {
343 if (track.GetBackupTrack()) seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup);
344
345 isGold = kTRUE;
346 }
347
348 // Almost gold track
349 if ((!isGold) && (track.GetNCross() == 0) && (track.GetChi2() / track.GetNumberOfClusters() < 7)) {
350 //seed->UpdateTrackParams(track, AliESDtrack::kTRDbackup);
351 if (track.GetBackupTrack()) seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup);
352
353 isGold = kTRUE;
354 }
355
356 if ((!isGold) && (track.GetBackupTrack())) {
357 if ((track.GetBackupTrack()->GetNumberOfClusters() > foundMin) && ((track.GetBackupTrack()->GetChi2()/(track.GetBackupTrack()->GetNumberOfClusters()+1)) < 7)) {
358 seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup);
359 isGold = kTRUE;
360 }
361 }
362
363 //if ((track->StatusForTOF() > 0) && (track->GetNCross() == 0) && (Float_t(track->GetNumberOfClusters()) / Float_t(track->GetNExpected()) > 0.4)) {
364 //seed->UpdateTrackParams(track->GetBackupTrack(), AliESDtrack::kTRDbackup);
365 //}
366 }
367 }
368
369 // Propagation to the TOF (I.Belikov)
370 if (track.IsStopped() == kFALSE) {
371 Double_t xtof = 371.0;
372 Double_t xTOF0 = 370.0;
373
374 Double_t c2 = track.GetSnp() + track.GetC() * (xtof - track.GetX());
375 if (TMath::Abs(c2) >= 0.99) continue;
376
ae3fbe1f 377 if (!PropagateToX(track, xTOF0, fgkMaxStep)) continue;
41702fec 378
379 // Energy losses taken to the account - check one more time
380 c2 = track.GetSnp() + track.GetC() * (xtof - track.GetX());
381 if (TMath::Abs(c2) >= 0.99) continue;
382
383 //if (!PropagateToX(*track,xTOF0,fgkMaxStep)) {
384 // fHBackfit->Fill(7);
385 //delete track;
386 // continue;
387 //}
388
389 Double_t ymax = xtof * TMath::Tan(0.5 * AliTRDgeometry::GetAlpha());
390 Double_t y;
391 track.GetYAt(xtof,GetBz(),y);
392 if (y > ymax) {
393 if (!track.Rotate( AliTRDgeometry::GetAlpha())) continue;
394 }else if (y < -ymax) {
395 if (!track.Rotate(-AliTRDgeometry::GetAlpha())) continue;
396 }
397
398 if (track.PropagateTo(xtof)) {
399 seed->UpdateTrackParams(&track, AliESDtrack::kTRDout);
400 track.UpdateESDtrack(seed);
41702fec 401 }
402 } else {
403 if ((track.GetNumberOfClusters() > 15) && (track.GetNumberOfClusters() > 0.5*expectedClr)) {
404 seed->UpdateTrackParams(&track, AliESDtrack::kTRDout);
405
406 track.UpdateESDtrack(seed);
41702fec 407 }
408 }
409
410 seed->SetTRDQuality(track.StatusForTOF());
411 seed->SetTRDBudget(track.GetBudget(0));
412 }
d611c74f 413 if(index) delete [] index;
414 if(quality) delete [] quality;
41702fec 415
416
417 AliInfo(Form("Number of seeds: %d", nSeed));
418 AliInfo(Form("Number of back propagated TRD tracks: %d", found));
419
d611c74f 420 // run stand alone tracking
3a039a31 421 if (fReconstructor->IsSeeding()) Clusters2Tracks(event);
41702fec 422
423 return 0;
0906e73e 424}
425
426
427//____________________________________________________________________
428Int_t AliTRDtrackerV1::RefitInward(AliESDEvent *event)
429{
41702fec 430 //
431 // Refits tracks within the TRD. The ESD event is expected to contain seeds
432 // at the outer part of the TRD.
433 // The tracks are propagated to the innermost time bin
434 // of the TRD and the ESD event is updated
435 // Origin: Thomas KUHR (Thomas.Kuhr@cern.ch)
436 //
437
438 Int_t nseed = 0; // contor for loaded seeds
439 Int_t found = 0; // contor for updated TRD tracks
440
441
442 AliTRDtrackV1 track;
443 for (Int_t itrack = 0; itrack < event->GetNumberOfTracks(); itrack++) {
444 AliESDtrack *seed = event->GetTrack(itrack);
445 new(&track) AliTRDtrackV1(*seed);
446
447 if (track.GetX() < 270.0) {
448 seed->UpdateTrackParams(&track, AliESDtrack::kTRDbackup);
449 continue;
450 }
451
452 ULong_t status = seed->GetStatus();
e4d4864b 453 // reject tracks which failed propagation in the TRD
41702fec 454 if((status & AliESDtrack::kTRDout) == 0) continue;
e4d4864b 455
456 // reject tracks which are produced by the TRD stand alone track finder.
457 if((status & AliESDtrack::kTRDin) == 0) continue;
41702fec 458 nseed++;
459
460 track.ResetCovariance(50.0);
461
462 // do the propagation and processing
463 Bool_t kUPDATE = kFALSE;
464 Double_t xTPC = 250.0;
465 if(FollowProlongation(track)){
466 // Prolongate to TPC
467 if (PropagateToX(track, xTPC, fgkMaxStep)) { // -with update
468 seed->UpdateTrackParams(&track, AliESDtrack::kTRDrefit);
469 found++;
470 kUPDATE = kTRUE;
471 }
472 }
473
474 // Prolongate to TPC without update
475 if(!kUPDATE) {
476 AliTRDtrackV1 tt(*seed);
477 if (PropagateToX(tt, xTPC, fgkMaxStep)) seed->UpdateTrackParams(&tt, AliESDtrack::kTRDrefit);
478 }
479 }
480 AliInfo(Form("Number of loaded seeds: %d",nseed));
481 AliInfo(Form("Number of found tracks from loaded seeds: %d",found));
482
483 return 0;
0906e73e 484}
485
0906e73e 486//____________________________________________________________________
487Int_t AliTRDtrackerV1::FollowProlongation(AliTRDtrackV1 &t)
488{
41702fec 489 // Extrapolates the TRD track in the TPC direction.
490 //
491 // Parameters
492 // t : the TRD track which has to be extrapolated
493 //
494 // Output
495 // number of clusters attached to the track
496 //
497 // Detailed description
498 //
499 // Starting from current radial position of track <t> this function
500 // extrapolates the track through the 6 TRD layers. The following steps
501 // are being performed for each plane:
502 // 1. prepare track:
503 // a. get plane limits in the local x direction
504 // b. check crossing sectors
505 // c. check track inclination
506 // 2. search tracklet in the tracker list (see GetTracklet() for details)
507 // 3. evaluate material budget using the geo manager
508 // 4. propagate and update track using the tracklet information.
509 //
510 // Debug level 2
511 //
512
513 Int_t nClustersExpected = 0;
514 Int_t lastplane = 5; //GetLastPlane(&t);
515 for (Int_t iplane = lastplane; iplane >= 0; iplane--) {
516 Int_t index = 0;
517 AliTRDseedV1 *tracklet = GetTracklet(&t, iplane, index);
518 if(!tracklet) continue;
519 if(!tracklet->IsOK()) AliWarning("tracklet not OK");
520
521 Double_t x = tracklet->GetX0();
522 // reject tracklets which are not considered for inward refit
523 if(x > t.GetX()+fgkMaxStep) continue;
524
525 // append tracklet to track
526 t.SetTracklet(tracklet, index);
527
528 if (x < (t.GetX()-fgkMaxStep) && !PropagateToX(t, x+fgkMaxStep, fgkMaxStep)) break;
529 if (!AdjustSector(&t)) break;
530
531 // Start global position
532 Double_t xyz0[3];
533 t.GetXYZ(xyz0);
534
535 // End global position
536 Double_t alpha = t.GetAlpha(), y, z;
537 if (!t.GetProlongation(x,y,z)) break;
538 Double_t xyz1[3];
539 xyz1[0] = x * TMath::Cos(alpha) - y * TMath::Sin(alpha);
540 xyz1[1] = x * TMath::Sin(alpha) + y * TMath::Cos(alpha);
541 xyz1[2] = z;
542
543 // Get material budget
544 Double_t param[7];
545 AliTracker::MeanMaterialBudget(xyz0, xyz1, param);
546 Double_t xrho= param[0]*param[4];
547 Double_t xx0 = param[1]; // Get mean propagation parameters
548
549 // Propagate and update
550 t.PropagateTo(x, xx0, xrho);
551 if (!AdjustSector(&t)) break;
552
553 Double_t maxChi2 = t.GetPredictedChi2(tracklet);
554 if (maxChi2 < 1e+10 && t.Update(tracklet, maxChi2)){
555 nClustersExpected += tracklet->GetN();
556 }
557 }
558
3a039a31 559 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){
41702fec 560 Int_t index;
561 for(int iplane=0; iplane<6; iplane++){
562 AliTRDseedV1 *tracklet = GetTracklet(&t, iplane, index);
563 if(!tracklet) continue;
564 t.SetTracklet(tracklet, index);
565 }
566
567 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
568 TTreeSRedirector &cstreamer = *fgDebugStreamer;
569 cstreamer << "FollowProlongation"
570 << "EventNumber=" << eventNumber
571 << "ncl=" << nClustersExpected
572 //<< "track.=" << &t
573 << "\n";
574 }
575
576 return nClustersExpected;
0906e73e 577
578}
579
580//_____________________________________________________________________________
581Int_t AliTRDtrackerV1::FollowBackProlongation(AliTRDtrackV1 &t)
582{
41702fec 583 // Extrapolates the TRD track in the TOF direction.
584 //
585 // Parameters
586 // t : the TRD track which has to be extrapolated
587 //
588 // Output
589 // number of clusters attached to the track
590 //
591 // Detailed description
592 //
593 // Starting from current radial position of track <t> this function
594 // extrapolates the track through the 6 TRD layers. The following steps
595 // are being performed for each plane:
596 // 1. prepare track:
597 // a. get plane limits in the local x direction
598 // b. check crossing sectors
599 // c. check track inclination
600 // 2. build tracklet (see AliTRDseed::AttachClusters() for details)
601 // 3. evaluate material budget using the geo manager
602 // 4. propagate and update track using the tracklet information.
603 //
604 // Debug level 2
605 //
606
607 Int_t nClustersExpected = 0;
608 Double_t clength = AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick();
609 AliTRDtrackingChamber *chamber = 0x0;
610
3b57a3f7 611 AliTRDseedV1 tracklet, *ptrTracklet = 0x0;
181d2c97 612 // in case of stand alone tracking we store all the pointers to the tracklets in a temporary array
613 AliTRDseedV1 *tracklets[kNPlanes];
614 memset(tracklets, 0, sizeof(AliTRDseedV1 *) * kNPlanes);
615 for(Int_t ip = 0; ip < kNPlanes; ip++){
616 tracklets[ip] = t.GetTracklet(ip);
617 t.UnsetTracklet(ip);
618 }
3b57a3f7 619
053767a4 620 // Loop through the TRD layers
621 for (Int_t ilayer = 0; ilayer < AliTRDgeometry::Nlayer(); ilayer++) {
41702fec 622 // BUILD TRACKLET IF NOT ALREADY BUILT
623 Double_t x = 0., y, z, alpha;
181d2c97 624 ptrTracklet = tracklets[ilayer];
41702fec 625 if(!ptrTracklet){
053767a4 626 ptrTracklet = new(&tracklet) AliTRDseedV1(ilayer);
43d6ad34 627 ptrTracklet->SetReconstructor(fReconstructor);
41702fec 628 alpha = t.GetAlpha();
053767a4 629 Int_t sector = Int_t(alpha/AliTRDgeometry::GetAlpha() + (alpha>0. ? 0 : AliTRDgeometry::kNsector));
41702fec 630
631 if(!fTrSec[sector].GetNChambers()) continue;
632
053767a4 633 if((x = fTrSec[sector].GetX(ilayer)) < 1.) continue;
41702fec 634
43d6ad34 635 if (!t.GetProlongation(x, y, z)) return -nClustersExpected;
053767a4 636 Int_t stack = fGeom->GetStack(z, ilayer);
41702fec 637 Int_t nCandidates = stack >= 0 ? 1 : 2;
638 z -= stack >= 0 ? 0. : 4.;
639
640 for(int icham=0; icham<nCandidates; icham++, z+=8){
053767a4 641 if((stack = fGeom->GetStack(z, ilayer)) < 0) continue;
41702fec 642
053767a4 643 if(!(chamber = fTrSec[sector].GetChamber(stack, ilayer))) continue;
41702fec 644
3a039a31 645 if(chamber->GetNClusters() < fgNTimeBins*fReconstructor->GetRecoParam() ->GetFindableClusters()) continue;
41702fec 646
647 x = chamber->GetX();
648
053767a4 649 AliTRDpadPlane *pp = fGeom->GetPadPlane(ilayer, stack);
aec26713 650 tracklet.SetTilt(TMath::Tan(TMath::DegToRad()*pp->GetTiltingAngle()));
41702fec 651 tracklet.SetPadLength(pp->GetLengthIPad());
ae4e8b84 652 tracklet.SetDetector(chamber->GetDetector());
41702fec 653 tracklet.SetX0(x);
654 if(!tracklet.Init(&t)){
655 t.SetStopped(kTRUE);
656 return nClustersExpected;
657 }
658 if(!tracklet.AttachClustersIter(chamber, 1000.)) continue;
659 tracklet.Init(&t);
660
3a039a31 661 if(tracklet.GetN() < fgNTimeBins*fReconstructor->GetRecoParam() ->GetFindableClusters()) continue;
41702fec 662
663 break;
664 }
76b60503 665 //ptrTracklet->UseClusters();
41702fec 666 }
667 if(!ptrTracklet->IsOK()){
668 if(x < 1.) continue; //temporary
43d6ad34 669 if(!PropagateToX(t, x-fgkMaxStep, fgkMaxStep)) return -nClustersExpected;
670 if(!AdjustSector(&t)) return -nClustersExpected;
671 if(TMath::Abs(t.GetSnp()) > fgkMaxSnp) return -nClustersExpected;
41702fec 672 continue;
673 }
674
675 // Propagate closer to the current chamber if neccessary
676 x -= clength;
43d6ad34 677 if (x > (fgkMaxStep + t.GetX()) && !PropagateToX(t, x-fgkMaxStep, fgkMaxStep)) return -nClustersExpected;
678 if (!AdjustSector(&t)) return -nClustersExpected;
679 if (TMath::Abs(t.GetSnp()) > fgkMaxSnp) return -nClustersExpected;
41702fec 680
681 // load tracklet to the tracker and the track
682 ptrTracklet = SetTracklet(ptrTracklet);
683 t.SetTracklet(ptrTracklet, fTracklets->GetEntriesFast()-1);
684
685
686 // Calculate the mean material budget along the path inside the chamber
687 //Calculate global entry and exit positions of the track in chamber (only track prolongation)
688 Double_t xyz0[3]; // entry point
689 t.GetXYZ(xyz0);
690 alpha = t.GetAlpha();
691 x = ptrTracklet->GetX0();
43d6ad34 692 if (!t.GetProlongation(x, y, z)) return -nClustersExpected;
41702fec 693 Double_t xyz1[3]; // exit point
694 xyz1[0] = x * TMath::Cos(alpha) - y * TMath::Sin(alpha);
695 xyz1[1] = +x * TMath::Sin(alpha) + y * TMath::Cos(alpha);
696 xyz1[2] = z;
697 Double_t param[7];
698 AliTracker::MeanMaterialBudget(xyz0, xyz1, param);
699 // The mean propagation parameters
700 Double_t xrho = param[0]*param[4]; // density*length
701 Double_t xx0 = param[1]; // radiation length
702
703 // Propagate and update track
43d6ad34 704 if (!t.PropagateTo(x, xx0, xrho)) return -nClustersExpected;
705 if (!AdjustSector(&t)) return -nClustersExpected;
41702fec 706 Double_t maxChi2 = t.GetPredictedChi2(ptrTracklet);
43d6ad34 707 if (!t.Update(ptrTracklet, maxChi2)) return -nClustersExpected;
ae3fbe1f 708 if (maxChi2<1e+10) {
41702fec 709 nClustersExpected += ptrTracklet->GetN();
710 //t.SetTracklet(&tracklet, index);
711 }
712 // Reset material budget if 2 consecutive gold
053767a4 713 if(ilayer>0 && t.GetTracklet(ilayer-1) && ptrTracklet->GetN() + t.GetTracklet(ilayer-1)->GetN() > 20) t.SetBudget(2, 0.);
41702fec 714
715 // Make backup of the track until is gold
716 // TO DO update quality check of the track.
717 // consider comparison with fTimeBinsRange
718 Float_t ratio0 = ptrTracklet->GetN() / Float_t(fgNTimeBins);
719 //Float_t ratio1 = Float_t(t.GetNumberOfClusters()+1) / Float_t(t.GetNExpected()+1);
720 //printf("tracklet.GetChi2() %f [< 18.0]\n", tracklet.GetChi2());
721 //printf("ratio0 %f [> 0.8]\n", ratio0);
722 //printf("ratio1 %f [> 0.6]\n", ratio1);
723 //printf("ratio0+ratio1 %f [> 1.5]\n", ratio0+ratio1);
724 //printf("t.GetNCross() %d [== 0]\n", t.GetNCross());
725 //printf("TMath::Abs(t.GetSnp()) %f [< 0.85]\n", TMath::Abs(t.GetSnp()));
726 //printf("t.GetNumberOfClusters() %d [> 20]\n", t.GetNumberOfClusters());
727
728 if (//(tracklet.GetChi2() < 18.0) && TO DO check with FindClusters and move it to AliTRDseed::Update
729 (ratio0 > 0.8) &&
730 //(ratio1 > 0.6) &&
731 //(ratio0+ratio1 > 1.5) &&
732 (t.GetNCross() == 0) &&
733 (TMath::Abs(t.GetSnp()) < 0.85) &&
734 (t.GetNumberOfClusters() > 20)) t.MakeBackupTrack();
735
053767a4 736 } // end layers loop
41702fec 737
3a039a31 738 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){
41702fec 739 TTreeSRedirector &cstreamer = *fgDebugStreamer;
740 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
741 //AliTRDtrackV1 *debugTrack = new AliTRDtrackV1(t);
742 //debugTrack->SetOwner();
743 cstreamer << "FollowBackProlongation"
744 << "EventNumber=" << eventNumber
745 << "ncl=" << nClustersExpected
746 //<< "track.=" << debugTrack
747 << "\n";
748 }
749
750 return nClustersExpected;
0906e73e 751}
752
eb38ed55 753//_________________________________________________________________________
754Float_t AliTRDtrackerV1::FitRieman(AliTRDseedV1 *tracklets, Double_t *chi2, Int_t *planes){
41702fec 755 //
756 // Fits a Riemann-circle to the given points without tilting pad correction.
757 // The fit is performed using an instance of the class AliRieman (equations
758 // and transformations see documentation of this class)
759 // Afterwards all the tracklets are Updated
760 //
761 // Parameters: - Array of tracklets (AliTRDseedV1)
762 // - Storage for the chi2 values (beginning with direction z)
763 // - Seeding configuration
764 // Output: - The curvature
765 //
766 AliRieman *fitter = AliTRDtrackerV1::GetRiemanFitter();
767 fitter->Reset();
768 Int_t allplanes[] = {0, 1, 2, 3, 4, 5};
769 Int_t *ppl = &allplanes[0];
770 Int_t maxLayers = 6;
771 if(planes){
772 maxLayers = 4;
773 ppl = planes;
774 }
775 for(Int_t il = 0; il < maxLayers; il++){
776 if(!tracklets[ppl[il]].IsOK()) continue;
777 fitter->AddPoint(tracklets[ppl[il]].GetX0(), tracklets[ppl[il]].GetYfitR(0), tracklets[ppl[il]].GetZProb(),1,10);
778 }
779 fitter->Update();
780 // Set the reference position of the fit and calculate the chi2 values
781 memset(chi2, 0, sizeof(Double_t) * 2);
782 for(Int_t il = 0; il < maxLayers; il++){
783 // Reference positions
784 tracklets[ppl[il]].Init(fitter);
785
786 // chi2
787 if((!tracklets[ppl[il]].IsOK()) && (!planes)) continue;
788 chi2[0] += tracklets[ppl[il]].GetChi2Y();
789 chi2[1] += tracklets[ppl[il]].GetChi2Z();
790 }
791 return fitter->GetC();
eb38ed55 792}
793
794//_________________________________________________________________________
795void AliTRDtrackerV1::FitRieman(AliTRDcluster **seedcl, Double_t chi2[2])
796{
41702fec 797 //
798 // Performs a Riemann helix fit using the seedclusters as spacepoints
799 // Afterwards the chi2 values are calculated and the seeds are updated
800 //
801 // Parameters: - The four seedclusters
802 // - The tracklet array (AliTRDseedV1)
803 // - The seeding configuration
804 // - Chi2 array
805 //
806 // debug level 2
807 //
808 AliRieman *fitter = AliTRDtrackerV1::GetRiemanFitter();
809 fitter->Reset();
810 for(Int_t i = 0; i < 4; i++)
811 fitter->AddPoint(seedcl[i]->GetX(), seedcl[i]->GetY(), seedcl[i]->GetZ(), 1, 10);
812 fitter->Update();
813
814
815 // Update the seed and calculated the chi2 value
816 chi2[0] = 0; chi2[1] = 0;
817 for(Int_t ipl = 0; ipl < kNSeedPlanes; ipl++){
818 // chi2
819 chi2[0] += (seedcl[ipl]->GetZ() - fitter->GetZat(seedcl[ipl]->GetX())) * (seedcl[ipl]->GetZ() - fitter->GetZat(seedcl[ipl]->GetX()));
820 chi2[1] += (seedcl[ipl]->GetY() - fitter->GetYat(seedcl[ipl]->GetX())) * (seedcl[ipl]->GetY() - fitter->GetYat(seedcl[ipl]->GetX()));
821 }
eb38ed55 822}
823
824
825//_________________________________________________________________________
826Float_t AliTRDtrackerV1::FitTiltedRiemanConstraint(AliTRDseedV1 *tracklets, Double_t zVertex)
827{
41702fec 828 //
829 // Fits a helix to the clusters. Pad tilting is considered. As constraint it is
830 // assumed that the vertex position is set to 0.
831 // This method is very usefull for high-pt particles
832 // Basis for the fit: (x - x0)^2 + (y - y0)^2 - R^2 = 0
833 // x0, y0: Center of the circle
834 // Measured y-position: ymeas = y - tan(phiT)(zc - zt)
835 // zc: center of the pad row
836 // Equation which has to be fitted (after transformation):
837 // a + b * u + e * v + 2*(ymeas + tan(phiT)(z - zVertex))*t = 0
838 // Transformation:
839 // t = 1/(x^2 + y^2)
840 // u = 2 * x * t
841 // v = 2 * x * tan(phiT) * t
842 // Parameters in the equation:
843 // a = -1/y0, b = x0/y0, e = dz/dx
844 //
845 // The Curvature is calculated by the following equation:
846 // - curv = a/Sqrt(b^2 + 1) = 1/R
847 // Parameters: - the 6 tracklets
848 // - the Vertex constraint
849 // Output: - the Chi2 value of the track
850 //
851 // debug level 5
852 //
853
854 TLinearFitter *fitter = GetTiltedRiemanFitterConstraint();
855 fitter->StoreData(kTRUE);
856 fitter->ClearPoints();
857 AliTRDcluster *cl = 0x0;
858
859 Float_t x, y, z, w, t, error, tilt;
860 Double_t uvt[2];
861 Int_t nPoints = 0;
053767a4 862 for(Int_t ilr = 0; ilr < AliTRDgeometry::kNlayer; ilr++){
863 if(!tracklets[ilr].IsOK()) continue;
41702fec 864 for(Int_t itb = 0; itb < fgNTimeBins; itb++){
053767a4 865 if(!tracklets[ilr].IsUsable(itb)) continue;
866 cl = tracklets[ilr].GetClusters(itb);
41702fec 867 x = cl->GetX();
868 y = cl->GetY();
869 z = cl->GetZ();
053767a4 870 tilt = tracklets[ilr].GetTilt();
41702fec 871 // Transformation
872 t = 1./(x * x + y * y);
873 uvt[0] = 2. * x * t;
874 uvt[1] = 2. * x * t * tilt ;
875 w = 2. * (y + tilt * (z - zVertex)) * t;
876 error = 2. * 0.2 * t;
877 fitter->AddPoint(uvt, w, error);
878 nPoints++;
879 }
880 }
881 fitter->Eval();
882
883 // Calculate curvature
884 Double_t a = fitter->GetParameter(0);
885 Double_t b = fitter->GetParameter(1);
886 Double_t curvature = a/TMath::Sqrt(b*b + 1);
887
888 Float_t chi2track = fitter->GetChisquare()/Double_t(nPoints);
889 for(Int_t ip = 0; ip < AliTRDtrackerV1::kNPlanes; ip++)
890 tracklets[ip].SetCC(curvature);
891
3a039a31 892/* if(fReconstructor->GetStreamLevel() >= 5){
41702fec 893 //Linear Model on z-direction
894 Double_t xref = CalculateReferenceX(tracklets); // Relative to the middle of the stack
895 Double_t slope = fitter->GetParameter(2);
896 Double_t zref = slope * xref;
897 Float_t chi2Z = CalculateChi2Z(tracklets, zref, slope, xref);
898 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
899 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
900 TTreeSRedirector &treeStreamer = *fgDebugStreamer;
901 treeStreamer << "FitTiltedRiemanConstraint"
902 << "EventNumber=" << eventNumber
903 << "CandidateNumber=" << candidateNumber
904 << "Curvature=" << curvature
905 << "Chi2Track=" << chi2track
906 << "Chi2Z=" << chi2Z
907 << "zref=" << zref
908 << "\n";
3a039a31 909 }*/
41702fec 910 return chi2track;
eb38ed55 911}
912
913//_________________________________________________________________________
914Float_t AliTRDtrackerV1::FitTiltedRieman(AliTRDseedV1 *tracklets, Bool_t sigError)
915{
41702fec 916 //
917 // Performs a Riemann fit taking tilting pad correction into account
918 // The equation of a Riemann circle, where the y position is substituted by the
919 // measured y-position taking pad tilting into account, has to be transformed
920 // into a 4-dimensional hyperplane equation
921 // Riemann circle: (x-x0)^2 + (y-y0)^2 -R^2 = 0
922 // Measured y-Position: ymeas = y - tan(phiT)(zc - zt)
923 // zc: center of the pad row
924 // zt: z-position of the track
925 // The z-position of the track is assumed to be linear dependent on the x-position
926 // Transformed equation: a + b * u + c * t + d * v + e * w - 2 * (ymeas + tan(phiT) * zc) * t = 0
927 // Transformation: u = 2 * x * t
928 // v = 2 * tan(phiT) * t
929 // w = 2 * tan(phiT) * (x - xref) * t
930 // t = 1 / (x^2 + ymeas^2)
931 // Parameters: a = -1/y0
932 // b = x0/y0
933 // c = (R^2 -x0^2 - y0^2)/y0
934 // d = offset
935 // e = dz/dx
936 // If the offset respectively the slope in z-position is impossible, the parameters are fixed using
937 // results from the simple riemann fit. Afterwards the fit is redone.
938 // The curvature is calculated according to the formula:
939 // curv = a/(1 + b^2 + c*a) = 1/R
940 //
941 // Paramters: - Array of tracklets (connected to the track candidate)
942 // - Flag selecting the error definition
943 // Output: - Chi2 values of the track (in Parameter list)
944 //
945 TLinearFitter *fitter = GetTiltedRiemanFitter();
946 fitter->StoreData(kTRUE);
947 fitter->ClearPoints();
948 AliTRDLeastSquare zfitter;
949 AliTRDcluster *cl = 0x0;
950
951 Double_t xref = CalculateReferenceX(tracklets);
952 Double_t x, y, z, t, tilt, dx, w, we;
953 Double_t uvt[4];
954 Int_t nPoints = 0;
955 // Containers for Least-square fitter
956 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
957 if(!tracklets[ipl].IsOK()) continue;
958 for(Int_t itb = 0; itb < fgNTimeBins; itb++){
959 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
960 if (!tracklets[ipl].IsUsable(itb)) continue;
961 x = cl->GetX();
962 y = cl->GetY();
963 z = cl->GetZ();
964 tilt = tracklets[ipl].GetTilt();
965 dx = x - xref;
966 // Transformation
967 t = 1./(x*x + y*y);
968 uvt[0] = 2. * x * t;
969 uvt[1] = t;
970 uvt[2] = 2. * tilt * t;
971 uvt[3] = 2. * tilt * dx * t;
972 w = 2. * (y + tilt*z) * t;
973 // error definition changes for the different calls
974 we = 2. * t;
975 we *= sigError ? tracklets[ipl].GetSigmaY() : 0.2;
976 fitter->AddPoint(uvt, w, we);
977 zfitter.AddPoint(&x, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
978 nPoints++;
979 }
980 }
981 fitter->Eval();
982 zfitter.Eval();
983
984 Double_t offset = fitter->GetParameter(3);
985 Double_t slope = fitter->GetParameter(4);
986
987 // Linear fitter - not possible to make boundaries
988 // Do not accept non possible z and dzdx combinations
989 Bool_t acceptablez = kTRUE;
990 Double_t zref = 0.0;
991 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
992 if(!tracklets[iLayer].IsOK()) continue;
993 zref = offset + slope * (tracklets[iLayer].GetX0() - xref);
994 if (TMath::Abs(tracklets[iLayer].GetZProb() - zref) > tracklets[iLayer].GetPadLength() * 0.5 + 1.0)
995 acceptablez = kFALSE;
996 }
997 if (!acceptablez) {
998 Double_t dzmf = zfitter.GetFunctionParameter(1);
999 Double_t zmf = zfitter.GetFunctionValue(&xref);
1000 fgTiltedRieman->FixParameter(3, zmf);
1001 fgTiltedRieman->FixParameter(4, dzmf);
1002 fitter->Eval();
1003 fitter->ReleaseParameter(3);
1004 fitter->ReleaseParameter(4);
1005 offset = fitter->GetParameter(3);
1006 slope = fitter->GetParameter(4);
1007 }
1008
1009 // Calculate Curvarture
1010 Double_t a = fitter->GetParameter(0);
1011 Double_t b = fitter->GetParameter(1);
1012 Double_t c = fitter->GetParameter(2);
1013 Double_t curvature = 1.0 + b*b - c*a;
1014 if (curvature > 0.0)
1015 curvature = a / TMath::Sqrt(curvature);
1016
1017 Double_t chi2track = fitter->GetChisquare()/Double_t(nPoints);
1018
1019 // Update the tracklets
1020 Double_t dy, dz;
1021 for(Int_t iLayer = 0; iLayer < AliTRDtrackerV1::kNPlanes; iLayer++) {
1022
1023 x = tracklets[iLayer].GetX0();
1024 y = 0;
1025 z = 0;
1026 dy = 0;
1027 dz = 0;
1028
1029 // y: R^2 = (x - x0)^2 + (y - y0)^2
1030 // => y = y0 +/- Sqrt(R^2 - (x - x0)^2)
1031 // R = Sqrt() = 1/Curvature
1032 // => y = y0 +/- Sqrt(1/Curvature^2 - (x - x0)^2)
1033 Double_t res = (x * a + b); // = (x - x0)/y0
1034 res *= res;
1035 res = 1.0 - c * a + b * b - res; // = (R^2 - (x - x0)^2)/y0^2
1036 if (res >= 0) {
1037 res = TMath::Sqrt(res);
1038 y = (1.0 - res) / a;
1039 }
1040
1041 // dy: R^2 = (x - x0)^2 + (y - y0)^2
1042 // => y = +/- Sqrt(R^2 - (x - x0)^2) + y0
1043 // => dy/dx = (x - x0)/Sqrt(R^2 - (x - x0)^2)
1044 // Curvature: cr = 1/R = a/Sqrt(1 + b^2 - c*a)
1045 // => dy/dx = (x - x0)/(1/(cr^2) - (x - x0)^2)
1046 Double_t x0 = -b / a;
1047 if (-c * a + b * b + 1 > 0) {
1048 if (1.0/(curvature * curvature) - (x - x0) * (x - x0) > 0.0) {
1049 Double_t yderiv = (x - x0) / TMath::Sqrt(1.0/(curvature * curvature) - (x - x0) * (x - x0));
1050 if (a < 0) yderiv *= -1.0;
1051 dy = yderiv;
1052 }
1053 }
1054 z = offset + slope * (x - xref);
1055 dz = slope;
1056 tracklets[iLayer].SetYref(0, y);
1057 tracklets[iLayer].SetYref(1, dy);
1058 tracklets[iLayer].SetZref(0, z);
1059 tracklets[iLayer].SetZref(1, dz);
1060 tracklets[iLayer].SetC(curvature);
1061 tracklets[iLayer].SetChi2(chi2track);
1062 }
1063
3a039a31 1064/* if(fReconstructor->GetStreamLevel() >=5){
41702fec 1065 TTreeSRedirector &cstreamer = *fgDebugStreamer;
1066 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
1067 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
1068 Double_t chi2z = CalculateChi2Z(tracklets, offset, slope, xref);
1069 cstreamer << "FitTiltedRieman0"
1070 << "EventNumber=" << eventNumber
1071 << "CandidateNumber=" << candidateNumber
1072 << "xref=" << xref
1073 << "Chi2Z=" << chi2z
1074 << "\n";
3a039a31 1075 }*/
41702fec 1076 return chi2track;
eb38ed55 1077}
1078
3b57a3f7 1079
9e333711 1080//____________________________________________________________________
1081Double_t AliTRDtrackerV1::FitLine(AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t err, Int_t np, AliTrackPoint *points)
1082{
1083 AliTRDLeastSquare yfitter, zfitter;
1084 AliTRDcluster *cl = 0x0;
1085
1086 AliTRDseedV1 work[kNPlanes], *tracklet = 0x0;
1087 if(!tracklets){
1088 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1089 if(!(tracklet = track->GetTracklet(ipl))) continue;
1090 if(!tracklet->IsOK()) continue;
1091 new(&work[ipl]) AliTRDseedV1(*tracklet);
1092 }
1093 tracklets = &work[0];
1094 }
1095
1096 Double_t xref = CalculateReferenceX(tracklets);
1097 Double_t x, y, z, dx, ye, yr, tilt;
1098 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1099 if(!tracklets[ipl].IsOK()) continue;
1100 for(Int_t itb = 0; itb < fgNTimeBins; itb++){
1101 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1102 if (!tracklets[ipl].IsUsable(itb)) continue;
1103 x = cl->GetX();
1104 z = cl->GetZ();
1105 dx = x - xref;
1106 zfitter.AddPoint(&dx, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
1107 }
1108 }
1109 zfitter.Eval();
1110 Double_t z0 = zfitter.GetFunctionParameter(0);
1111 Double_t dzdx = zfitter.GetFunctionParameter(1);
1112 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1113 if(!tracklets[ipl].IsOK()) continue;
1114 for(Int_t itb = 0; itb < fgNTimeBins; itb++){
1115 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1116 if (!tracklets[ipl].IsUsable(itb)) continue;
1117 x = cl->GetX();
1118 y = cl->GetY();
1119 z = cl->GetZ();
1120 tilt = tracklets[ipl].GetTilt();
1121 dx = x - xref;
1122 yr = y + tilt*(z - z0 - dzdx*dx);
1123 // error definition changes for the different calls
1124 ye = tilt*TMath::Sqrt(cl->GetSigmaZ2());
1125 ye += err ? tracklets[ipl].GetSigmaY() : 0.2;
1126 yfitter.AddPoint(&dx, yr, ye);
1127 }
1128 }
1129 yfitter.Eval();
1130 Double_t y0 = yfitter.GetFunctionParameter(0);
1131 Double_t dydx = yfitter.GetFunctionParameter(1);
1132 Double_t chi2 = 0.;//yfitter.GetChisquare()/Double_t(nPoints);
1133
1134 //update track points array
1135 if(np && points){
1136 Float_t xyz[3];
1137 for(int ip=0; ip<np; ip++){
1138 points[ip].GetXYZ(xyz);
1139 xyz[1] = y0 + dydx * (xyz[0] - xref);
1140 xyz[2] = z0 + dzdx * (xyz[0] - xref);
1141 points[ip].SetXYZ(xyz);
1142 }
1143 }
1144 return chi2;
1145}
1146
1147
3b57a3f7 1148//_________________________________________________________________________
1149Double_t AliTRDtrackerV1::FitRiemanTilt(AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t sigError, Int_t np, AliTrackPoint *points)
1150{
41702fec 1151 //
1152 // Performs a Riemann fit taking tilting pad correction into account
1153 // The equation of a Riemann circle, where the y position is substituted by the
1154 // measured y-position taking pad tilting into account, has to be transformed
1155 // into a 4-dimensional hyperplane equation
1156 // Riemann circle: (x-x0)^2 + (y-y0)^2 -R^2 = 0
1157 // Measured y-Position: ymeas = y - tan(phiT)(zc - zt)
1158 // zc: center of the pad row
1159 // zt: z-position of the track
1160 // The z-position of the track is assumed to be linear dependent on the x-position
1161 // Transformed equation: a + b * u + c * t + d * v + e * w - 2 * (ymeas + tan(phiT) * zc) * t = 0
1162 // Transformation: u = 2 * x * t
1163 // v = 2 * tan(phiT) * t
1164 // w = 2 * tan(phiT) * (x - xref) * t
1165 // t = 1 / (x^2 + ymeas^2)
1166 // Parameters: a = -1/y0
1167 // b = x0/y0
1168 // c = (R^2 -x0^2 - y0^2)/y0
1169 // d = offset
1170 // e = dz/dx
1171 // If the offset respectively the slope in z-position is impossible, the parameters are fixed using
1172 // results from the simple riemann fit. Afterwards the fit is redone.
1173 // The curvature is calculated according to the formula:
1174 // curv = a/(1 + b^2 + c*a) = 1/R
1175 //
1176 // Paramters: - Array of tracklets (connected to the track candidate)
1177 // - Flag selecting the error definition
1178 // Output: - Chi2 values of the track (in Parameter list)
1179 //
1180 TLinearFitter *fitter = GetTiltedRiemanFitter();
1181 fitter->StoreData(kTRUE);
1182 fitter->ClearPoints();
1183 AliTRDLeastSquare zfitter;
1184 AliTRDcluster *cl = 0x0;
3b57a3f7 1185
1186 AliTRDseedV1 work[kNPlanes], *tracklet = 0x0;
1187 if(!tracklets){
1188 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1189 if(!(tracklet = track->GetTracklet(ipl))) continue;
1190 if(!tracklet->IsOK()) continue;
1191 new(&work[ipl]) AliTRDseedV1(*tracklet);
1192 }
1193 tracklets = &work[0];
1194 }
1195
41702fec 1196 Double_t xref = CalculateReferenceX(tracklets);
1197 Double_t x, y, z, t, tilt, dx, w, we;
1198 Double_t uvt[4];
1199 Int_t nPoints = 0;
1200 // Containers for Least-square fitter
1201 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1202 if(!tracklets[ipl].IsOK()) continue;
1203 for(Int_t itb = 0; itb < fgNTimeBins; itb++){
1204 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1205 if (!tracklets[ipl].IsUsable(itb)) continue;
1206 x = cl->GetX();
1207 y = cl->GetY();
1208 z = cl->GetZ();
1209 tilt = tracklets[ipl].GetTilt();
1210 dx = x - xref;
1211 // Transformation
1212 t = 1./(x*x + y*y);
1213 uvt[0] = 2. * x * t;
1214 uvt[1] = t;
1215 uvt[2] = 2. * tilt * t;
1216 uvt[3] = 2. * tilt * dx * t;
1217 w = 2. * (y + tilt*z) * t;
1218 // error definition changes for the different calls
1219 we = 2. * t;
1220 we *= sigError ? tracklets[ipl].GetSigmaY() : 0.2;
1221 fitter->AddPoint(uvt, w, we);
1222 zfitter.AddPoint(&x, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
1223 nPoints++;
1224 }
1225 }
aec26713 1226 if(fitter->Eval()) return 1.E10;
1227
41702fec 1228 Double_t z0 = fitter->GetParameter(3);
1229 Double_t dzdx = fitter->GetParameter(4);
3b57a3f7 1230
1231
1232 // Linear fitter - not possible to make boundaries
1233 // Do not accept non possible z and dzdx combinations
1234 Bool_t accept = kTRUE;
1235 Double_t zref = 0.0;
1236 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
1237 if(!tracklets[iLayer].IsOK()) continue;
1238 zref = z0 + dzdx * (tracklets[iLayer].GetX0() - xref);
1239 if (TMath::Abs(tracklets[iLayer].GetZProb() - zref) > tracklets[iLayer].GetPadLength() * 0.5 + 1.0)
1240 accept = kFALSE;
1241 }
1242 if (!accept) {
41702fec 1243 zfitter.Eval();
3b57a3f7 1244 Double_t dzmf = zfitter.GetFunctionParameter(1);
1245 Double_t zmf = zfitter.GetFunctionValue(&xref);
1246 fitter->FixParameter(3, zmf);
1247 fitter->FixParameter(4, dzmf);
1248 fitter->Eval();
1249 fitter->ReleaseParameter(3);
1250 fitter->ReleaseParameter(4);
1251 z0 = fitter->GetParameter(3); // = zmf ?
1252 dzdx = fitter->GetParameter(4); // = dzmf ?
1253 }
1254
1255 // Calculate Curvature
1256 Double_t a = fitter->GetParameter(0);
1257 Double_t b = fitter->GetParameter(1);
1258 Double_t c = fitter->GetParameter(2);
1259 Double_t y0 = 1. / a;
1260 Double_t x0 = -b * y0;
1261 Double_t R = TMath::Sqrt(y0*y0 + x0*x0 - c*y0);
1262 Double_t C = 1.0 + b*b - c*a;
1263 if (C > 0.0) C = a / TMath::Sqrt(C);
1264
1265 // Calculate chi2 of the fit
1266 Double_t chi2 = fitter->GetChisquare()/Double_t(nPoints);
1267
1268 // Update the tracklets
1269 if(!track){
1270 for(Int_t ip = 0; ip < kNPlanes; ip++) {
1271 x = tracklets[ip].GetX0();
1272 Double_t tmp = TMath::Sqrt(R*R-(x-x0)*(x-x0));
1273
1274 // y: R^2 = (x - x0)^2 + (y - y0)^2
1275 // => y = y0 +/- Sqrt(R^2 - (x - x0)^2)
1276 tracklets[ip].SetYref(0, y0 - (y0>0.?1.:-1)*tmp);
1277 // => dy/dx = (x - x0)/Sqrt(R^2 - (x - x0)^2)
1278 tracklets[ip].SetYref(1, (x - x0) / tmp);
1279 tracklets[ip].SetZref(0, z0 + dzdx * (x - xref));
1280 tracklets[ip].SetZref(1, dzdx);
1281 tracklets[ip].SetC(C);
1282 tracklets[ip].SetChi2(chi2);
1283 }
1284 }
1285
1286 //update track points array
1287 if(np && points){
1288 Float_t xyz[3];
1289 for(int ip=0; ip<np; ip++){
1290 points[ip].GetXYZ(xyz);
1291 xyz[1] = y0 - (y0>0.?1.:-1)*TMath::Sqrt(R*R-(xyz[0]-x0)*(xyz[0]-x0));
1292 xyz[2] = z0 + dzdx * (xyz[0] - xref);
1293 points[ip].SetXYZ(xyz);
1294 }
1295 }
1296
3a039a31 1297/* if(fReconstructor->GetStreamLevel() >=5){
3b57a3f7 1298 TTreeSRedirector &cstreamer = *fgDebugStreamer;
1299 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
1300 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
1301 Double_t chi2z = CalculateChi2Z(tracklets, z0, dzdx, xref);
1302 cstreamer << "FitRiemanTilt"
1303 << "EventNumber=" << eventNumber
1304 << "CandidateNumber=" << candidateNumber
1305 << "xref=" << xref
1306 << "Chi2Z=" << chi2z
1307 << "\n";
3a039a31 1308 }*/
3b57a3f7 1309 return chi2;
1310}
1311
1312
1bf51039 1313//____________________________________________________________________
1314Double_t AliTRDtrackerV1::FitKalman(AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t up, Int_t np, AliTrackPoint *points)
1315{
1316// Kalman filter implementation for the TRD.
1317// It returns the positions of the fit in the array "points"
1318//
1319// Author : A.Bercuci@gsi.de
1320
1321 //printf("Start track @ x[%f]\n", track->GetX());
1322
1323 //prepare marker points along the track
1324 Int_t ip = np ? 0 : 1;
1325 while(ip<np){
1326 if((up?-1:1) * (track->GetX() - points[ip].GetX()) > 0.) break;
1327 //printf("AliTRDtrackerV1::FitKalman() : Skip track marker x[%d] = %7.3f. Before track start ( %7.3f ).\n", ip, points[ip].GetX(), track->GetX());
1328 ip++;
1329 }
1330 //if(points) printf("First marker point @ x[%d] = %f\n", ip, points[ip].GetX());
1331
1332
1333 AliTRDseedV1 tracklet, *ptrTracklet = 0x0;
1334
1335 //Loop through the TRD planes
1336 for (Int_t jplane = 0; jplane < kNPlanes; jplane++) {
1337 // GET TRACKLET OR BUILT IT
1338 Int_t iplane = up ? jplane : kNPlanes - 1 - jplane;
1339 if(tracklets){
1340 if(!(ptrTracklet = &tracklets[iplane])) continue;
1341 }else{
1342 if(!(ptrTracklet = track->GetTracklet(iplane))){
1343 /*AliTRDtrackerV1 *tracker = 0x0;
1344 if(!(tracker = dynamic_cast<AliTRDtrackerV1*>( AliTRDReconstructor::Tracker()))) continue;
1345 ptrTracklet = new(&tracklet) AliTRDseedV1(iplane);
1346 if(!tracker->MakeTracklet(ptrTracklet, track)) */
1347 continue;
1348 }
1349 }
1350 if(!ptrTracklet->IsOK()) continue;
1351
1352 Double_t x = ptrTracklet->GetX0();
1353
1354 while(ip < np){
1355 //don't do anything if next marker is after next update point.
1356 if((up?-1:1) * (points[ip].GetX() - x) - fgkMaxStep < 0) break;
1357
1358 //printf("Propagate to x[%d] = %f\n", ip, points[ip].GetX());
1359
1360 if(((up?-1:1) * (points[ip].GetX() - track->GetX()) < 0) && !PropagateToX(*track, points[ip].GetX(), fgkMaxStep)) return -1.;
1361
1362 Double_t xyz[3]; // should also get the covariance
1363 track->GetXYZ(xyz); points[ip].SetXYZ(xyz[0], xyz[1], xyz[2]);
1364 ip++;
1365 }
1366 //printf("plane[%d] tracklet[%p] x[%f]\n", iplane, ptrTracklet, x);
1367
1368 //Propagate closer to the next update point
1369 if(((up?-1:1) * (x - track->GetX()) + fgkMaxStep < 0) && !PropagateToX(*track, x + (up?-1:1)*fgkMaxStep, fgkMaxStep)) return -1.;
1370
1371 if(!AdjustSector(track)) return -1;
1372 if(TMath::Abs(track->GetSnp()) > fgkMaxSnp) return -1;
1373
1374 //load tracklet to the tracker and the track
1375/* Int_t index;
1376 if((index = FindTracklet(ptrTracklet)) < 0){
1377 ptrTracklet = SetTracklet(&tracklet);
1378 index = fTracklets->GetEntriesFast()-1;
1379 }
1380 track->SetTracklet(ptrTracklet, index);*/
1381
1382
1383 // register tracklet to track with tracklet creation !!
1384 // PropagateBack : loaded tracklet to the tracker and update index
1385 // RefitInward : update index
1386 // MakeTrack : loaded tracklet to the tracker and update index
1387 if(!tracklets) track->SetTracklet(ptrTracklet, -1);
1388
1389
1390 //Calculate the mean material budget along the path inside the chamber
1391 Double_t xyz0[3]; track->GetXYZ(xyz0);
1392 Double_t alpha = track->GetAlpha();
1393 Double_t xyz1[3], y, z;
1394 if(!track->GetProlongation(x, y, z)) return -1;
1395 xyz1[0] = x * TMath::Cos(alpha) - y * TMath::Sin(alpha);
1396 xyz1[1] = +x * TMath::Sin(alpha) + y * TMath::Cos(alpha);
1397 xyz1[2] = z;
1398 Double_t param[7];
1399 AliTracker::MeanMaterialBudget(xyz0, xyz1, param);
1400 Double_t xrho = param[0]*param[4]; // density*length
1401 Double_t xx0 = param[1]; // radiation length
1402
1403 //Propagate the track
1404 track->PropagateTo(x, xx0, xrho);
1405 if (!AdjustSector(track)) break;
1406
1407 //Update track
1408 Double_t chi2 = track->GetPredictedChi2(ptrTracklet);
1409 if(chi2<1e+10) track->Update(ptrTracklet, chi2);
1410
1411 if(!up) continue;
1412
1413 //Reset material budget if 2 consecutive gold
1414 if(iplane>0 && track->GetTracklet(iplane-1) && ptrTracklet->GetN() + track->GetTracklet(iplane-1)->GetN() > 20) track->SetBudget(2, 0.);
1415 } // end planes loop
1416
1417 // extrapolation
1418 while(ip < np){
1419 if(((up?-1:1) * (points[ip].GetX() - track->GetX()) < 0) && !PropagateToX(*track, points[ip].GetX(), fgkMaxStep)) return -1.;
1420
1421 Double_t xyz[3]; // should also get the covariance
1422 track->GetXYZ(xyz); points[ip].SetXYZ(xyz[0], xyz[1], xyz[2]);
1423 ip++;
1424 }
1425
1426 return track->GetChi2();
1427}
3b57a3f7 1428
eb38ed55 1429//_________________________________________________________________________
bb56afff 1430Float_t AliTRDtrackerV1::CalculateChi2Z(AliTRDseedV1 *tracklets, Double_t offset, Double_t slope, Double_t xref)
eb38ed55 1431{
41702fec 1432 //
1433 // Calculates the chi2-value of the track in z-Direction including tilting pad correction.
1434 // A linear dependence on the x-value serves as a model.
1435 // The parameters are related to the tilted Riemann fit.
1436 // Parameters: - Array of tracklets (AliTRDseedV1) related to the track candidate
1437 // - the offset for the reference x
1438 // - the slope
1439 // - the reference x position
1440 // Output: - The Chi2 value of the track in z-Direction
1441 //
1442 Float_t chi2Z = 0, nLayers = 0;
053767a4 1443 for (Int_t iLayer = 0; iLayer < AliTRDgeometry::kNlayer; iLayer++) {
41702fec 1444 if(!tracklets[iLayer].IsOK()) continue;
1445 Double_t z = offset + slope * (tracklets[iLayer].GetX0() - xref);
1446 chi2Z += TMath::Abs(tracklets[iLayer].GetMeanz() - z);
1447 nLayers++;
1448 }
1449 chi2Z /= TMath::Max((nLayers - 3.0),1.0);
1450 return chi2Z;
eb38ed55 1451}
1452
bccda319 1453//_____________________________________________________________________________
1454Int_t AliTRDtrackerV1::PropagateToX(AliTRDtrackV1 &t, Double_t xToGo, Double_t maxStep)
1455{
41702fec 1456 //
1457 // Starting from current X-position of track <t> this function
1458 // extrapolates the track up to radial position <xToGo>.
1459 // Returns 1 if track reaches the plane, and 0 otherwise
1460 //
bccda319 1461
41702fec 1462 const Double_t kEpsilon = 0.00001;
bccda319 1463
41702fec 1464 // Current track X-position
1465 Double_t xpos = t.GetX();
bccda319 1466
41702fec 1467 // Direction: inward or outward
1468 Double_t dir = (xpos < xToGo) ? 1.0 : -1.0;
bccda319 1469
41702fec 1470 while (((xToGo - xpos) * dir) > kEpsilon) {
bccda319 1471
41702fec 1472 Double_t xyz0[3];
1473 Double_t xyz1[3];
1474 Double_t param[7];
1475 Double_t x;
1476 Double_t y;
1477 Double_t z;
bccda319 1478
41702fec 1479 // The next step size
1480 Double_t step = dir * TMath::Min(TMath::Abs(xToGo-xpos),maxStep);
bccda319 1481
41702fec 1482 // Get the global position of the starting point
1483 t.GetXYZ(xyz0);
bccda319 1484
41702fec 1485 // X-position after next step
1486 x = xpos + step;
bccda319 1487
41702fec 1488 // Get local Y and Z at the X-position of the next step
1489 if (!t.GetProlongation(x,y,z)) {
1490 return 0; // No prolongation possible
1491 }
bccda319 1492
41702fec 1493 // The global position of the end point of this prolongation step
1494 xyz1[0] = x * TMath::Cos(t.GetAlpha()) - y * TMath::Sin(t.GetAlpha());
1495 xyz1[1] = +x * TMath::Sin(t.GetAlpha()) + y * TMath::Cos(t.GetAlpha());
1496 xyz1[2] = z;
bccda319 1497
41702fec 1498 // Calculate the mean material budget between start and
1499 // end point of this prolongation step
1500 AliTracker::MeanMaterialBudget(xyz0, xyz1, param);
bccda319 1501
41702fec 1502 // Propagate the track to the X-position after the next step
1503 if (!t.PropagateTo(x,param[1],param[0]*param[4])) {
1504 return 0;
1505 }
bccda319 1506
41702fec 1507 // Rotate the track if necessary
1508 AdjustSector(&t);
bccda319 1509
41702fec 1510 // New track X-position
1511 xpos = t.GetX();
bccda319 1512
41702fec 1513 }
bccda319 1514
41702fec 1515 return 1;
bccda319 1516
1517}
1518
eb38ed55 1519
1520//_____________________________________________________________________________
1521Int_t AliTRDtrackerV1::ReadClusters(TClonesArray* &array, TTree *clusterTree) const
1522{
41702fec 1523 //
1524 // Reads AliTRDclusters from the file.
1525 // The names of the cluster tree and branches
1526 // should match the ones used in AliTRDclusterizer::WriteClusters()
1527 //
1528
1529 Int_t nsize = Int_t(clusterTree->GetTotBytes() / (sizeof(AliTRDcluster)));
1530 TObjArray *clusterArray = new TObjArray(nsize+1000);
1531
1532 TBranch *branch = clusterTree->GetBranch("TRDcluster");
1533 if (!branch) {
1534 AliError("Can't get the branch !");
1535 return 1;
1536 }
1537 branch->SetAddress(&clusterArray);
1538
1539 if(!fClusters){
8ae98148 1540 Float_t nclusters = fReconstructor->GetRecoParam()->GetNClusters();
1541 if(fReconstructor->IsHLT()) nclusters /= AliTRDgeometry::kNsector;
1542 array = new TClonesArray("AliTRDcluster", Int_t(nclusters));
41702fec 1543 array->SetOwner(kTRUE);
1544 }
1545
1546 // Loop through all entries in the tree
1547 Int_t nEntries = (Int_t) clusterTree->GetEntries();
1548 Int_t nbytes = 0;
1549 Int_t ncl = 0;
1550 AliTRDcluster *c = 0x0;
1551 for (Int_t iEntry = 0; iEntry < nEntries; iEntry++) {
1552 // Import the tree
1553 nbytes += clusterTree->GetEvent(iEntry);
1554
1555 // Get the number of points in the detector
1556 Int_t nCluster = clusterArray->GetEntriesFast();
1557 for (Int_t iCluster = 0; iCluster < nCluster; iCluster++) {
1558 if(!(c = (AliTRDcluster *) clusterArray->UncheckedAt(iCluster))) continue;
1559 c->SetInChamber();
1560 new((*fClusters)[ncl++]) AliTRDcluster(*c);
1561 delete (clusterArray->RemoveAt(iCluster));
1562 }
1563
1564 }
1565 delete clusterArray;
1566
1567 return 0;
eb38ed55 1568}
1569
1570//_____________________________________________________________________________
1571Int_t AliTRDtrackerV1::LoadClusters(TTree *cTree)
1572{
41702fec 1573 //
66f6bfd9 1574 // Fills clusters into TRD tracking sectors
41702fec 1575 //
41702fec 1576
48f8adf3 1577 if(!fReconstructor->IsWritingClusters()){
1578 fClusters = AliTRDReconstructor::GetClusters();
1579 } else {
66f6bfd9 1580 if (ReadClusters(fClusters, cTree)) {
1581 AliError("Problem with reading the clusters !");
1582 return 1;
1583 }
1584 }
1585 SetClustersOwner();
1586
48f8adf3 1587 if(!fClusters || !fClusters->GetEntriesFast()){
66f6bfd9 1588 AliInfo("No TRD clusters");
41702fec 1589 return 1;
1590 }
66f6bfd9 1591
1592 //Int_t nin =
1593 BuildTrackingContainers();
1594
1595 //Int_t ncl = fClusters->GetEntriesFast();
1596 //AliInfo(Form("Clusters %d [%6.2f %% in the active volume]", ncl, 100.*float(nin)/ncl));
1597
1598 return 0;
1599}
1600
1601//_____________________________________________________________________________
1602Int_t AliTRDtrackerV1::LoadClusters(TClonesArray *clusters)
1603{
1604 //
1605 // Fills clusters into TRD tracking sectors
1606 // Function for use in the HLT
1607
1608 if(!clusters || !clusters->GetEntriesFast()){
1609 AliInfo("No TRD clusters");
41702fec 1610 return 1;
1611 }
1612
66f6bfd9 1613 fClusters = clusters;
1614 SetClustersOwner();
1615
1616 //Int_t nin =
1617 BuildTrackingContainers();
1618
1619 //Int_t ncl = fClusters->GetEntriesFast();
1620 //AliInfo(Form("Clusters %d [%6.2f %% in the active volume]", ncl, 100.*float(nin)/ncl));
1621
1622 return 0;
1623}
1624
1625
1626//____________________________________________________________________
1627Int_t AliTRDtrackerV1::BuildTrackingContainers()
1628{
1629// Building tracking containers for clusters
1630
1631 Int_t nin =0, icl = fClusters->GetEntriesFast();
41702fec 1632 while (icl--) {
1633 AliTRDcluster *c = (AliTRDcluster *) fClusters->UncheckedAt(icl);
1634 if(c->IsInChamber()) nin++;
1635 Int_t detector = c->GetDetector();
1636 Int_t sector = fGeom->GetSector(detector);
053767a4 1637 Int_t stack = fGeom->GetStack(detector);
1638 Int_t layer = fGeom->GetLayer(detector);
41702fec 1639
053767a4 1640 fTrSec[sector].GetChamber(stack, layer, kTRUE)->InsertCluster(c, icl);
41702fec 1641 }
b0a48c4d 1642
1643 const AliTRDCalDet *cal = AliTRDcalibDB::Instance()->GetT0Det();
053767a4 1644 for(int isector =0; isector<AliTRDgeometry::kNsector; isector++){
41702fec 1645 if(!fTrSec[isector].GetNChambers()) continue;
b0a48c4d 1646 fTrSec[isector].Init(fReconstructor, cal);
41702fec 1647 }
66f6bfd9 1648
1649 return nin;
eb38ed55 1650}
1651
1652
66f6bfd9 1653
0906e73e 1654//____________________________________________________________________
1655void AliTRDtrackerV1::UnloadClusters()
1656{
41702fec 1657 //
1658 // Clears the arrays of clusters and tracks. Resets sectors and timebins
1659 //
0906e73e 1660
41702fec 1661 if(fTracks) fTracks->Delete();
1662 if(fTracklets) fTracklets->Delete();
48f8adf3 1663 if(fClusters){
1664 if(IsClustersOwner()) fClusters->Delete();
1665
1666 // save clusters array in the reconstructor for further use.
1667 if(!fReconstructor->IsWritingClusters()){
1668 AliTRDReconstructor::SetClusters(fClusters);
1669 SetClustersOwner(kFALSE);
1670 } else AliTRDReconstructor::SetClusters(0x0);
1671 }
0906e73e 1672
053767a4 1673 for (int i = 0; i < AliTRDgeometry::kNsector; i++) fTrSec[i].Clear();
0906e73e 1674
41702fec 1675 // Increment the Event Number
1676 AliTRDtrackerDebug::SetEventNumber(AliTRDtrackerDebug::GetEventNumber() + 1);
eb38ed55 1677}
0906e73e 1678
eb38ed55 1679//_____________________________________________________________________________
1680Bool_t AliTRDtrackerV1::AdjustSector(AliTRDtrackV1 *track)
1681{
41702fec 1682 //
1683 // Rotates the track when necessary
1684 //
1685
1686 Double_t alpha = AliTRDgeometry::GetAlpha();
1687 Double_t y = track->GetY();
1688 Double_t ymax = track->GetX()*TMath::Tan(0.5*alpha);
1689
1690 if (y > ymax) {
1691 if (!track->Rotate( alpha)) {
1692 return kFALSE;
1693 }
1694 }
1695 else if (y < -ymax) {
1696 if (!track->Rotate(-alpha)) {
1697 return kFALSE;
1698 }
1699 }
1700
1701 return kTRUE;
0906e73e 1702
1703}
1704
eb38ed55 1705
0906e73e 1706//____________________________________________________________________
1707AliTRDseedV1* AliTRDtrackerV1::GetTracklet(AliTRDtrackV1 *track, Int_t p, Int_t &idx)
1708{
41702fec 1709 // Find tracklet for TRD track <track>
1710 // Parameters
1711 // - track
1712 // - sector
1713 // - plane
1714 // - index
1715 // Output
1716 // tracklet
1717 // index
1718 // Detailed description
1719 //
1720 idx = track->GetTrackletIndex(p);
1721 AliTRDseedV1 *tracklet = (idx==0xffff) ? 0x0 : (AliTRDseedV1*)fTracklets->UncheckedAt(idx);
1722
1723 return tracklet;
0906e73e 1724}
1725
1726//____________________________________________________________________
3b57a3f7 1727AliTRDseedV1* AliTRDtrackerV1::SetTracklet(AliTRDseedV1 *tracklet)
0906e73e 1728{
41702fec 1729 // Add this tracklet to the list of tracklets stored in the tracker
1730 //
1731 // Parameters
1732 // - tracklet : pointer to the tracklet to be added to the list
1733 //
1734 // Output
1735 // - the index of the new tracklet in the tracker tracklets list
1736 //
1737 // Detailed description
1738 // Build the tracklets list if it is not yet created (late initialization)
1739 // and adds the new tracklet to the list.
1740 //
1741 if(!fTracklets){
053767a4 1742 fTracklets = new TClonesArray("AliTRDseedV1", AliTRDgeometry::Nsector()*kMaxTracksStack);
41702fec 1743 fTracklets->SetOwner(kTRUE);
1744 }
1745 Int_t nentries = fTracklets->GetEntriesFast();
1746 return new ((*fTracklets)[nentries]) AliTRDseedV1(*tracklet);
972ef65e 1747}
1748
d20df6fc 1749//____________________________________________________________________
1750AliTRDtrackV1* AliTRDtrackerV1::SetTrack(AliTRDtrackV1 *track)
1751{
1752 // Add this track to the list of tracks stored in the tracker
1753 //
1754 // Parameters
1755 // - track : pointer to the track to be added to the list
1756 //
1757 // Output
1758 // - the pointer added
1759 //
1760 // Detailed description
1761 // Build the tracks list if it is not yet created (late initialization)
1762 // and adds the new track to the list.
1763 //
1764 if(!fTracks){
053767a4 1765 fTracks = new TClonesArray("AliTRDtrackV1", AliTRDgeometry::Nsector()*kMaxTracksStack);
d20df6fc 1766 fTracks->SetOwner(kTRUE);
1767 }
1768 Int_t nentries = fTracks->GetEntriesFast();
1769 return new ((*fTracks)[nentries]) AliTRDtrackV1(*track);
1770}
1771
1772
0906e73e 1773
e4f2f73d 1774//____________________________________________________________________
eb38ed55 1775Int_t AliTRDtrackerV1::Clusters2TracksSM(Int_t sector, AliESDEvent *esd)
e4f2f73d 1776{
41702fec 1777 //
1778 // Steer tracking for one SM.
1779 //
1780 // Parameters :
1781 // sector : Array of (SM) propagation layers containing clusters
1782 // esd : The current ESD event. On output it contains the also
1783 // the ESD (TRD) tracks found in this SM.
1784 //
1785 // Output :
1786 // Number of tracks found in this TRD supermodule.
1787 //
1788 // Detailed description
1789 //
1790 // 1. Unpack AliTRDpropagationLayers objects for each stack.
1791 // 2. Launch stack tracking.
1792 // See AliTRDtrackerV1::Clusters2TracksStack() for details.
1793 // 3. Pack results in the ESD event.
1794 //
1795
1796 // allocate space for esd tracks in this SM
1797 TClonesArray esdTrackList("AliESDtrack", 2*kMaxTracksStack);
1798 esdTrackList.SetOwner();
1799
1800 Int_t nTracks = 0;
1801 Int_t nChambers = 0;
1802 AliTRDtrackingChamber **stack = 0x0, *chamber = 0x0;
053767a4 1803 for(int istack = 0; istack<AliTRDgeometry::kNstack; istack++){
41702fec 1804 if(!(stack = fTrSec[sector].GetStack(istack))) continue;
1805 nChambers = 0;
053767a4 1806 for(int ilayer=0; ilayer<AliTRDgeometry::kNlayer; ilayer++){
1807 if(!(chamber = stack[ilayer])) continue;
3a039a31 1808 if(chamber->GetNClusters() < fgNTimeBins * fReconstructor->GetRecoParam() ->GetFindableClusters()) continue;
41702fec 1809 nChambers++;
053767a4 1810 //AliInfo(Form("sector %d stack %d layer %d clusters %d", sector, istack, ilayer, chamber->GetNClusters()));
41702fec 1811 }
1812 if(nChambers < 4) continue;
1813 //AliInfo(Form("Doing stack %d", istack));
1814 nTracks += Clusters2TracksStack(stack, &esdTrackList);
1815 }
1816 //AliInfo(Form("Found %d tracks in SM %d [%d]\n", nTracks, sector, esd->GetNumberOfTracks()));
1817
1818 for(int itrack=0; itrack<nTracks; itrack++)
1819 esd->AddTrack((AliESDtrack*)esdTrackList[itrack]);
1820
1821 // Reset Track and Candidate Number
1822 AliTRDtrackerDebug::SetCandidateNumber(0);
1823 AliTRDtrackerDebug::SetTrackNumber(0);
1824 return nTracks;
e4f2f73d 1825}
1826
1827//____________________________________________________________________
eb38ed55 1828Int_t AliTRDtrackerV1::Clusters2TracksStack(AliTRDtrackingChamber **stack, TClonesArray *esdTrackList)
e4f2f73d 1829{
41702fec 1830 //
1831 // Make tracks in one TRD stack.
1832 //
1833 // Parameters :
1834 // layer : Array of stack propagation layers containing clusters
1835 // esdTrackList : Array of ESD tracks found by the stand alone tracker.
1836 // On exit the tracks found in this stack are appended.
1837 //
1838 // Output :
1839 // Number of tracks found in this stack.
1840 //
1841 // Detailed description
1842 //
1843 // 1. Find the 3 most useful seeding chambers. See BuildSeedingConfigs() for details.
1844 // 2. Steer AliTRDtrackerV1::MakeSeeds() for 3 seeding layer configurations.
1845 // See AliTRDtrackerV1::MakeSeeds() for more details.
1846 // 3. Arrange track candidates in decreasing order of their quality
1847 // 4. Classify tracks in 5 categories according to:
1848 // a) number of layers crossed
1849 // b) track quality
1850 // 5. Sign clusters by tracks in decreasing order of track quality
1851 // 6. Build AliTRDtrack out of seeding tracklets
1852 // 7. Cook MC label
1853 // 8. Build ESD track and register it to the output list
1854 //
1855
b0a48c4d 1856 const AliTRDCalDet *cal = AliTRDcalibDB::Instance()->GetT0Det();
41702fec 1857 AliTRDtrackingChamber *chamber = 0x0;
1858 AliTRDseedV1 sseed[kMaxTracksStack*6]; // to be initialized
1859 Int_t pars[4]; // MakeSeeds parameters
1860
1861 //Double_t alpha = AliTRDgeometry::GetAlpha();
1862 //Double_t shift = .5 * alpha;
1863 Int_t configs[kNConfigs];
1864
1865 // Build initial seeding configurations
1866 Double_t quality = BuildSeedingConfigs(stack, configs);
3a039a31 1867 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){
41702fec 1868 AliInfo(Form("Plane config %d %d %d Quality %f"
1869 , configs[0], configs[1], configs[2], quality));
1870 }
d931f2aa 1871
41702fec 1872
1873 // Initialize contors
1874 Int_t ntracks, // number of TRD track candidates
1875 ntracks1, // number of registered TRD tracks/iter
1876 ntracks2 = 0; // number of all registered TRD tracks in stack
1877 fSieveSeeding = 0;
d931f2aa 1878
1879 // Get stack index
1880 Int_t ic = 0; AliTRDtrackingChamber **cIter = &stack[0];
1881 while(ic<kNPlanes && !(*cIter)){ic++; cIter++;}
1882 if(!(*cIter)) return ntracks2;
1883 Int_t istack = fGeom->GetStack((*cIter)->GetDetector());
1884
41702fec 1885 do{
1886 // Loop over seeding configurations
1887 ntracks = 0; ntracks1 = 0;
1888 for (Int_t iconf = 0; iconf<3; iconf++) {
1889 pars[0] = configs[iconf];
1890 pars[1] = ntracks;
d931f2aa 1891 pars[2] = istack;
41702fec 1892 ntracks = MakeSeeds(stack, &sseed[6*ntracks], pars);
1893 if(ntracks == kMaxTracksStack) break;
1894 }
3a039a31 1895 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1) AliInfo(Form("Candidate TRD tracks %d in iteration %d.", ntracks, fSieveSeeding));
41702fec 1896
1897 if(!ntracks) break;
1898
1899 // Sort the seeds according to their quality
1900 Int_t sort[kMaxTracksStack];
1901 TMath::Sort(ntracks, fTrackQuality, sort, kTRUE);
1902
1903 // Initialize number of tracks so far and logic switches
1904 Int_t ntracks0 = esdTrackList->GetEntriesFast();
1905 Bool_t signedTrack[kMaxTracksStack];
1906 Bool_t fakeTrack[kMaxTracksStack];
1907 for (Int_t i=0; i<ntracks; i++){
1908 signedTrack[i] = kFALSE;
1909 fakeTrack[i] = kFALSE;
1910 }
1911 //AliInfo("Selecting track candidates ...");
1912
1913 // Sieve clusters in decreasing order of track quality
1914 Double_t trackParams[7];
1915 // AliTRDseedV1 *lseed = 0x0;
1916 Int_t jSieve = 0, candidates;
1917 do{
1918 //AliInfo(Form("\t\tITER = %i ", jSieve));
1919
1920 // Check track candidates
1921 candidates = 0;
1922 for (Int_t itrack = 0; itrack < ntracks; itrack++) {
804bb02e 1923 Int_t trackIndex = sort[itrack];
1924 if (signedTrack[trackIndex] || fakeTrack[trackIndex]) continue;
41702fec 1925
1926
804bb02e 1927 // Calculate track parameters from tracklets seeds
804bb02e 1928 Int_t ncl = 0;
1929 Int_t nused = 0;
1930 Int_t nlayers = 0;
1931 Int_t findable = 0;
1932 for (Int_t jLayer = 0; jLayer < kNPlanes; jLayer++) {
1933 Int_t jseed = kNPlanes*trackIndex+jLayer;
1934 if(!sseed[jseed].IsOK()) continue;
1935 if (TMath::Abs(sseed[jseed].GetYref(0) / sseed[jseed].GetX0()) < 0.15) findable++;
1936
1937 sseed[jseed].UpdateUsed();
1938 ncl += sseed[jseed].GetN2();
1939 nused += sseed[jseed].GetNUsed();
1940 nlayers++;
804bb02e 1941 }
1942
41702fec 1943 // Filter duplicated tracks
1944 if (nused > 30){
1945 //printf("Skip %d nused %d\n", trackIndex, nused);
1946 fakeTrack[trackIndex] = kTRUE;
1947 continue;
1948 }
1949 if (Float_t(nused)/ncl >= .25){
1950 //printf("Skip %d nused/ncl >= .25\n", trackIndex);
1951 fakeTrack[trackIndex] = kTRUE;
1952 continue;
1953 }
1954
1955 // Classify tracks
1956 Bool_t skip = kFALSE;
1957 switch(jSieve){
1958 case 0:
1959 if(nlayers < 6) {skip = kTRUE; break;}
1960 if(TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -5.){skip = kTRUE; break;}
1961 break;
1962
1963 case 1:
1964 if(nlayers < findable){skip = kTRUE; break;}
1965 if(TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -4.){skip = kTRUE; break;}
1966 break;
1967
1968 case 2:
1969 if ((nlayers == findable) || (nlayers == 6)) { skip = kTRUE; break;}
1970 if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -6.0){skip = kTRUE; break;}
1971 break;
1972
1973 case 3:
1974 if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -5.){skip = kTRUE; break;}
1975 break;
1976
1977 case 4:
1978 if (nlayers == 3){skip = kTRUE; break;}
1979 //if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) - nused/(nlayers-3.0) < -15.0){skip = kTRUE; break;}
1980 break;
1981 }
1982 if(skip){
1983 candidates++;
1984 //printf("REJECTED : %d [%d] nlayers %d trackQuality = %e nused %d\n", itrack, trackIndex, nlayers, fTrackQuality[trackIndex], nused);
1985 continue;
1986 }
1987 signedTrack[trackIndex] = kTRUE;
1988
41702fec 1989
1990 // Sign clusters
1991 AliTRDcluster *cl = 0x0; Int_t clusterIndex = -1;
be24510a 1992 for (Int_t jLayer = 0; jLayer < kNPlanes; jLayer++) {
41702fec 1993 Int_t jseed = kNPlanes*trackIndex+jLayer;
1994 if(!sseed[jseed].IsOK()) continue;
1995 if(TMath::Abs(sseed[jseed].GetYfit(1) - sseed[jseed].GetYfit(1)) >= .2) continue; // check this condition with Marian
1996 sseed[jseed].UseClusters();
1997 if(!cl){
1998 Int_t ic = 0;
1999 while(!(cl = sseed[jseed].GetClusters(ic))) ic++;
2000 clusterIndex = sseed[jseed].GetIndexes(ic);
2001 }
2002 }
2003 if(!cl) continue;
2004
2005
2006 // Build track parameters
2007 AliTRDseedV1 *lseed =&sseed[trackIndex*6];
e79f8eb0 2008/* Int_t idx = 0;
41702fec 2009 while(idx<3 && !lseed->IsOK()) {
2010 idx++;
2011 lseed++;
e79f8eb0 2012 }*/
e79f8eb0 2013 Double_t x = lseed->GetX0();// - 3.5;
41702fec 2014 trackParams[0] = x; //NEW AB
e79f8eb0 2015 trackParams[1] = lseed->GetYref(0); // lseed->GetYat(x);
2016 trackParams[2] = lseed->GetZref(0); // lseed->GetZat(x);
2017 trackParams[3] = TMath::Sin(TMath::ATan(lseed->GetYref(1)));
41702fec 2018 trackParams[4] = lseed->GetZref(1) / TMath::Sqrt(1. + lseed->GetYref(1) * lseed->GetYref(1));
be24510a 2019 trackParams[5] = lseed->GetC();
41702fec 2020 Int_t ich = 0; while(!(chamber = stack[ich])) ich++;
2021 trackParams[6] = fGeom->GetSector(chamber->GetDetector());/* *alpha+shift; // Supermodule*/
2022
3a039a31 2023 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){
41702fec 2024 AliInfo(Form("Track %d [%d] nlayers %d trackQuality = %e nused %d, yref = %3.3f", itrack, trackIndex, nlayers, fTrackQuality[trackIndex], nused, trackParams[1]));
2025
2026 Int_t nclusters = 0;
2027 AliTRDseedV1 *dseed[6];
804bb02e 2028
2029 // Build track label - what happens if measured data ???
2030 Int_t labels[1000];
2031 Int_t outlab[1000];
2032 Int_t nlab = 0;
d877f55f 2033
2034 Int_t labelsall[1000];
2035 Int_t nlabelsall = 0;
2036 Int_t naccepted = 0;
2037
804bb02e 2038 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
2039 Int_t jseed = kNPlanes*trackIndex+iLayer;
2040 dseed[iLayer] = new AliTRDseedV1(sseed[jseed]);
2041 dseed[iLayer]->SetOwner();
2042 nclusters += sseed[jseed].GetN2();
2043 if(!sseed[jseed].IsOK()) continue;
2044 for(int ilab=0; ilab<2; ilab++){
2045 if(sseed[jseed].GetLabels(ilab) < 0) continue;
2046 labels[nlab] = sseed[jseed].GetLabels(ilab);
2047 nlab++;
2048 }
d877f55f 2049
2050 // Cooking label
2051 for (Int_t itime = 0; itime < fgNTimeBins; itime++) {
2052 if(!sseed[jseed].IsUsable(itime)) continue;
2053 naccepted++;
2054 Int_t tindex = 0, ilab = 0;
2055 while(ilab<3 && (tindex = sseed[jseed].GetClusters(itime)->GetLabel(ilab)) >= 0){
2056 labelsall[nlabelsall++] = tindex;
2057 ilab++;
2058 }
2059 }
41702fec 2060 }
804bb02e 2061 Freq(nlab,labels,outlab,kFALSE);
2062 Int_t label = outlab[0];
2063 Int_t frequency = outlab[1];
2064 Freq(nlabelsall,labelsall,outlab,kFALSE);
2065 Int_t label1 = outlab[0];
2066 Int_t label2 = outlab[2];
2067 Float_t fakeratio = (naccepted - outlab[1]) / Float_t(naccepted);
2068
41702fec 2069 //Int_t eventNrInFile = esd->GetEventNumberInFile();
2070 //AliInfo(Form("Number of clusters %d.", nclusters));
2071 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2072 Int_t trackNumber = AliTRDtrackerDebug::GetTrackNumber();
2073 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2074 TTreeSRedirector &cstreamer = *fgDebugStreamer;
2075 cstreamer << "Clusters2TracksStack"
2076 << "EventNumber=" << eventNumber
2077 << "TrackNumber=" << trackNumber
2078 << "CandidateNumber=" << candidateNumber
2079 << "Iter=" << fSieveSeeding
2080 << "Like=" << fTrackQuality[trackIndex]
2081 << "S0.=" << dseed[0]
2082 << "S1.=" << dseed[1]
2083 << "S2.=" << dseed[2]
2084 << "S3.=" << dseed[3]
2085 << "S4.=" << dseed[4]
2086 << "S5.=" << dseed[5]
2087 << "p0=" << trackParams[0]
2088 << "p1=" << trackParams[1]
2089 << "p2=" << trackParams[2]
2090 << "p3=" << trackParams[3]
2091 << "p4=" << trackParams[4]
2092 << "p5=" << trackParams[5]
2093 << "p6=" << trackParams[6]
2094 << "Label=" << label
2095 << "Label1=" << label1
2096 << "Label2=" << label2
2097 << "FakeRatio=" << fakeratio
2098 << "Freq=" << frequency
2099 << "Ncl=" << ncl
2100 << "NLayers=" << nlayers
2101 << "Findable=" << findable
41702fec 2102 << "NUsed=" << nused
2103 << "\n";
2104 }
2105
2106 AliTRDtrackV1 *track = MakeTrack(&sseed[trackIndex*kNPlanes], trackParams);
2107 if(!track){
2108 AliWarning("Fail to build a TRD Track.");
2109 continue;
2110 }
76b60503 2111
41702fec 2112 //AliInfo("End of MakeTrack()");
098c3c3d 2113 AliESDtrack *esdTrack = new ((*esdTrackList)[ntracks0++]) AliESDtrack();
2114 esdTrack->UpdateTrackParams(track, AliESDtrack::kTRDout);
2115 esdTrack->SetLabel(track->GetLabel());
2116 track->UpdateESDtrack(esdTrack);
41702fec 2117 // write ESD-friends if neccessary
3a039a31 2118 if (fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 0){
41702fec 2119 AliTRDtrackV1 *calibTrack = new AliTRDtrackV1(*track);
2120 calibTrack->SetOwner();
098c3c3d 2121 esdTrack->AddCalibObject(calibTrack);
41702fec 2122 }
41702fec 2123 ntracks1++;
2124 AliTRDtrackerDebug::SetTrackNumber(AliTRDtrackerDebug::GetTrackNumber() + 1);
2125 }
2126
2127 jSieve++;
2128 } while(jSieve<5 && candidates); // end track candidates sieve
2129 if(!ntracks1) break;
2130
2131 // increment counters
2132 ntracks2 += ntracks1;
4302c900 2133
2134 if(fReconstructor->IsHLT()) break;
41702fec 2135 fSieveSeeding++;
2136
2137 // Rebuild plane configurations and indices taking only unused clusters into account
2138 quality = BuildSeedingConfigs(stack, configs);
3a039a31 2139 if(quality < 1.E-7) break; //fReconstructor->GetRecoParam() ->GetPlaneQualityThreshold()) break;
41702fec 2140
2141 for(Int_t ip = 0; ip < kNPlanes; ip++){
2142 if(!(chamber = stack[ip])) continue;
b0a48c4d 2143 chamber->Build(fGeom, cal);//Indices(fSieveSeeding);
41702fec 2144 }
2145
3a039a31 2146 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){
41702fec 2147 AliInfo(Form("Sieve level %d Plane config %d %d %d Quality %f", fSieveSeeding, configs[0], configs[1], configs[2], quality));
2148 }
2149 } while(fSieveSeeding<10); // end stack clusters sieve
2150
2151
2152
2153 //AliInfo(Form("Registered TRD tracks %d in stack %d.", ntracks2, pars[1]));
2154
2155 return ntracks2;
e4f2f73d 2156}
2157
2158//___________________________________________________________________
eb38ed55 2159Double_t AliTRDtrackerV1::BuildSeedingConfigs(AliTRDtrackingChamber **stack, Int_t *configs)
e4f2f73d 2160{
41702fec 2161 //
2162 // Assign probabilities to chambers according to their
2163 // capability of producing seeds.
2164 //
2165 // Parameters :
2166 //
2167 // layers : Array of stack propagation layers for all 6 chambers in one stack
2168 // configs : On exit array of configuration indexes (see GetSeedingConfig()
2169 // for details) in the decreasing order of their seeding probabilities.
2170 //
2171 // Output :
2172 //
2173 // Return top configuration quality
2174 //
2175 // Detailed description:
2176 //
2177 // To each chamber seeding configuration (see GetSeedingConfig() for
2178 // the list of all configurations) one defines 2 quality factors:
2179 // - an apriori topological quality (see GetSeedingConfig() for details) and
2180 // - a data quality based on the uniformity of the distribution of
2181 // clusters over the x range (time bins population). See CookChamberQA() for details.
2182 // The overall chamber quality is given by the product of this 2 contributions.
2183 //
2184
2185 Double_t chamberQ[kNPlanes];
2186 AliTRDtrackingChamber *chamber = 0x0;
2187 for(int iplane=0; iplane<kNPlanes; iplane++){
2188 if(!(chamber = stack[iplane])) continue;
2189 chamberQ[iplane] = (chamber = stack[iplane]) ? chamber->GetQuality() : 0.;
2190 }
2191
2192 Double_t tconfig[kNConfigs];
2193 Int_t planes[4];
2194 for(int iconf=0; iconf<kNConfigs; iconf++){
2195 GetSeedingConfig(iconf, planes);
2196 tconfig[iconf] = fgTopologicQA[iconf];
2197 for(int iplane=0; iplane<4; iplane++) tconfig[iconf] *= chamberQ[planes[iplane]];
2198 }
2199
2200 TMath::Sort((Int_t)kNConfigs, tconfig, configs, kTRUE);
2201 // AliInfo(Form("q[%d] = %f", configs[0], tconfig[configs[0]]));
2202 // AliInfo(Form("q[%d] = %f", configs[1], tconfig[configs[1]]));
2203 // AliInfo(Form("q[%d] = %f", configs[2], tconfig[configs[2]]));
2204
2205 return tconfig[configs[0]];
e4f2f73d 2206}
2207
2208//____________________________________________________________________
eb38ed55 2209Int_t AliTRDtrackerV1::MakeSeeds(AliTRDtrackingChamber **stack, AliTRDseedV1 *sseed, Int_t *ipar)
e4f2f73d 2210{
41702fec 2211 //
2212 // Make tracklet seeds in the TRD stack.
2213 //
2214 // Parameters :
2215 // layers : Array of stack propagation layers containing clusters
2216 // sseed : Array of empty tracklet seeds. On exit they are filled.
2217 // ipar : Control parameters:
2218 // ipar[0] -> seeding chambers configuration
2219 // ipar[1] -> stack index
2220 // ipar[2] -> number of track candidates found so far
2221 //
2222 // Output :
2223 // Number of tracks candidates found.
2224 //
2225 // Detailed description
2226 //
2227 // The following steps are performed:
2228 // 1. Select seeding layers from seeding chambers
2229 // 2. Select seeding clusters from the seeding AliTRDpropagationLayerStack.
2230 // The clusters are taken from layer 3, layer 0, layer 1 and layer 2, in
2231 // this order. The parameters controling the range of accepted clusters in
2232 // layer 0, 1, and 2 are defined in AliTRDchamberTimeBin::BuildCond().
2233 // 3. Helix fit of the cluster set. (see AliTRDtrackerFitter::FitRieman(AliTRDcluster**))
2234 // 4. Initialize seeding tracklets in the seeding chambers.
2235 // 5. Filter 0.
2236 // Chi2 in the Y direction less than threshold ... (1./(3. - sLayer))
2237 // Chi2 in the Z direction less than threshold ... (1./(3. - sLayer))
2238 // 6. Attach clusters to seeding tracklets and find linear approximation of
2239 // the tracklet (see AliTRDseedV1::AttachClustersIter()). The number of used
2240 // clusters used by current seeds should not exceed ... (25).
2241 // 7. Filter 1.
2242 // All 4 seeding tracklets should be correctly constructed (see
2243 // AliTRDseedV1::AttachClustersIter())
2244 // 8. Helix fit of the seeding tracklets
2245 // 9. Filter 2.
2246 // Likelihood calculation of the fit. (See AliTRDtrackerV1::CookLikelihood() for details)
2247 // 10. Extrapolation of the helix fit to the other 2 chambers:
2248 // a) Initialization of extrapolation tracklet with fit parameters
2249 // b) Helix fit of tracklets
2250 // c) Attach clusters and linear interpolation to extrapolated tracklets
2251 // d) Helix fit of tracklets
2252 // 11. Improve seeding tracklets quality by reassigning clusters.
2253 // See AliTRDtrackerV1::ImproveSeedQuality() for details.
2254 // 12. Helix fit of all 6 seeding tracklets and chi2 calculation
2255 // 13. Hyperplane fit and track quality calculation. See AliTRDtrackerFitter::FitHyperplane() for details.
2256 // 14. Cooking labels for tracklets. Should be done only for MC
2257 // 15. Register seeds.
2258 //
2259
2260 AliTRDtrackingChamber *chamber = 0x0;
be24510a 2261 AliTRDcluster *c[kNSeedPlanes] = {0x0, 0x0, 0x0, 0x0}; // initilize seeding clusters
41702fec 2262 AliTRDseedV1 *cseed = &sseed[0]; // initialize tracklets for first track
2263 Int_t ncl, mcl; // working variable for looping over clusters
2264 Int_t index[AliTRDchamberTimeBin::kMaxClustersLayer], jndex[AliTRDchamberTimeBin::kMaxClustersLayer];
2265 // chi2 storage
2266 // chi2[0] = tracklet chi2 on the Z direction
2267 // chi2[1] = tracklet chi2 on the R direction
2268 Double_t chi2[4];
2269
e79f8eb0 2270 // Default positions for the anode wire in all 6 Layers in case of a stack with missing clusters
2271 // Positions taken using cosmic data taken with SM3 after rebuild
d931f2aa 2272 Double_t x_def[kNPlanes] = {300.2, 312.8, 325.4, 338.0, 350.6, 363.2};
41702fec 2273
2274 // this should be data member of AliTRDtrack
2275 Double_t seedQuality[kMaxTracksStack];
2276
2277 // unpack control parameters
2278 Int_t config = ipar[0];
2279 Int_t ntracks = ipar[1];
d931f2aa 2280 Int_t istack = ipar[2];
41702fec 2281 Int_t planes[kNSeedPlanes]; GetSeedingConfig(config, planes);
be24510a 2282 Int_t planesExt[kNPlanes-kNSeedPlanes]; GetExtrapolationConfig(config, planesExt);
2283
2284
41702fec 2285 // Init chambers geometry
41702fec 2286 Double_t hL[kNPlanes]; // Tilting angle
2287 Float_t padlength[kNPlanes]; // pad lenghts
2288 AliTRDpadPlane *pp = 0x0;
2289 for(int iplane=0; iplane<kNPlanes; iplane++){
2290 pp = fGeom->GetPadPlane(iplane, istack);
bb79ccd5 2291 hL[iplane] = TMath::Tan(TMath::DegToRad()*pp->GetTiltingAngle());
41702fec 2292 padlength[iplane] = pp->GetLengthIPad();
2293 }
2294
3a039a31 2295 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){
41702fec 2296 AliInfo(Form("Making seeds Stack[%d] Config[%d] Tracks[%d]...", istack, config, ntracks));
2297 }
2298
d931f2aa 2299 // Build seeding layers
d611c74f 2300 ResetSeedTB();
41702fec 2301 Int_t nlayers = 0;
41702fec 2302 for(int isl=0; isl<kNSeedPlanes; isl++){
2303 if(!(chamber = stack[planes[isl]])) continue;
3a039a31 2304 if(!chamber->GetSeedingLayer(fSeedTB[isl], fGeom, fReconstructor)) continue;
41702fec 2305 nlayers++;
41702fec 2306 }
2307 if(nlayers < 4) return 0;
2308
2309
2310 // Start finding seeds
2311 Double_t cond0[4], cond1[4], cond2[4];
2312 Int_t icl = 0;
d611c74f 2313 while((c[3] = (*fSeedTB[3])[icl++])){
41702fec 2314 if(!c[3]) continue;
d611c74f 2315 fSeedTB[0]->BuildCond(c[3], cond0, 0);
2316 fSeedTB[0]->GetClusters(cond0, index, ncl);
41702fec 2317 //printf("Found c[3] candidates 0 %d\n", ncl);
2318 Int_t jcl = 0;
2319 while(jcl<ncl) {
d611c74f 2320 c[0] = (*fSeedTB[0])[index[jcl++]];
41702fec 2321 if(!c[0]) continue;
2322 Double_t dx = c[3]->GetX() - c[0]->GetX();
2323 Double_t theta = (c[3]->GetZ() - c[0]->GetZ())/dx;
2324 Double_t phi = (c[3]->GetY() - c[0]->GetY())/dx;
d611c74f 2325 fSeedTB[1]->BuildCond(c[0], cond1, 1, theta, phi);
2326 fSeedTB[1]->GetClusters(cond1, jndex, mcl);
41702fec 2327 //printf("Found c[0] candidates 1 %d\n", mcl);
2328
2329 Int_t kcl = 0;
2330 while(kcl<mcl) {
d611c74f 2331 c[1] = (*fSeedTB[1])[jndex[kcl++]];
2332 if(!c[1]) continue;
2333 fSeedTB[2]->BuildCond(c[1], cond2, 2, theta, phi);
2334 c[2] = fSeedTB[2]->GetNearestCluster(cond2);
2335 //printf("Found c[1] candidate 2 %p\n", c[2]);
2336 if(!c[2]) continue;
2337
2338 // AliInfo("Seeding clusters found. Building seeds ...");
2339 // 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());
2340
804bb02e 2341 for (Int_t il = 0; il < kNPlanes; il++) cseed[il].Reset();
41702fec 2342
d611c74f 2343 FitRieman(c, chi2);
2344
d931f2aa 2345 AliTRDseedV1 *tseed = &cseed[0];
2346 AliTRDtrackingChamber **cIter = &stack[0];
2347 for(int iLayer=0; iLayer<kNPlanes; iLayer++, tseed++, cIter++){
2348 tseed->SetDetector((*cIter) ? (*cIter)->GetDetector() : -1);
43d6ad34 2349 tseed->SetTilt(hL[iLayer]);
2350 tseed->SetPadLength(padlength[iLayer]);
3a039a31 2351 tseed->SetReconstructor(fReconstructor);
d931f2aa 2352 tseed->SetX0((*cIter) ? (*cIter)->GetX() : x_def[iLayer]);
d611c74f 2353 tseed->Init(GetRiemanFitter());
2354 }
2355
2356 Bool_t isFake = kFALSE;
3a039a31 2357 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){
d611c74f 2358 if (c[0]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
2359 if (c[1]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
2360 if (c[2]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
2361
2362 Double_t xpos[4];
2363 for(Int_t l = 0; l < kNSeedPlanes; l++) xpos[l] = fSeedTB[l]->GetX();
2364 Float_t yref[4];
2365 for(int il=0; il<4; il++) yref[il] = cseed[planes[il]].GetYref(0);
2366 Int_t ll = c[3]->GetLabel(0);
2367 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2368 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2369 AliRieman *rim = GetRiemanFitter();
2370 TTreeSRedirector &cs0 = *fgDebugStreamer;
2371 cs0 << "MakeSeeds0"
2372 <<"EventNumber=" << eventNumber
2373 <<"CandidateNumber=" << candidateNumber
2374 <<"isFake=" << isFake
2375 <<"config=" << config
2376 <<"label=" << ll
2377 <<"chi2z=" << chi2[0]
2378 <<"chi2y=" << chi2[1]
2379 <<"Y2exp=" << cond2[0]
2380 <<"Z2exp=" << cond2[1]
2381 <<"X0=" << xpos[0] //layer[sLayer]->GetX()
2382 <<"X1=" << xpos[1] //layer[sLayer + 1]->GetX()
2383 <<"X2=" << xpos[2] //layer[sLayer + 2]->GetX()
2384 <<"X3=" << xpos[3] //layer[sLayer + 3]->GetX()
2385 <<"yref0=" << yref[0]
2386 <<"yref1=" << yref[1]
2387 <<"yref2=" << yref[2]
2388 <<"yref3=" << yref[3]
2389 <<"c0.=" << c[0]
2390 <<"c1.=" << c[1]
2391 <<"c2.=" << c[2]
2392 <<"c3.=" << c[3]
2393 <<"Seed0.=" << &cseed[planes[0]]
2394 <<"Seed1.=" << &cseed[planes[1]]
2395 <<"Seed2.=" << &cseed[planes[2]]
2396 <<"Seed3.=" << &cseed[planes[3]]
2397 <<"RiemanFitter.=" << rim
2398 <<"\n";
2399 }
3a039a31 2400 if(chi2[0] > fReconstructor->GetRecoParam() ->GetChi2Z()/*7./(3. - sLayer)*//*iter*/){
91834b8d 2401// //AliInfo(Form("Failed chi2 filter on chi2Z [%f].", chi2[0]));
d611c74f 2402 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2403 continue;
2404 }
3a039a31 2405 if(chi2[1] > fReconstructor->GetRecoParam() ->GetChi2Y()/*1./(3. - sLayer)*//*iter*/){
91834b8d 2406// //AliInfo(Form("Failed chi2 filter on chi2Y [%f].", chi2[1]));
d611c74f 2407 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2408 continue;
2409 }
2410 //AliInfo("Passed chi2 filter.");
2411
2412 // try attaching clusters to tracklets
2413 Int_t nUsedCl = 0;
2414 Int_t mlayers = 0;
be24510a 2415 for(int iLayer=0; iLayer<kNSeedPlanes; iLayer++){
d611c74f 2416 Int_t jLayer = planes[iLayer];
2417 if(!cseed[jLayer].AttachClustersIter(stack[jLayer], 5., kFALSE, c[iLayer])) continue;
2418 nUsedCl += cseed[jLayer].GetNUsed();
2419 if(nUsedCl > 25) break;
2420 mlayers++;
2421 }
be24510a 2422
2423 if(mlayers < kNSeedPlanes){
2424 //AliInfo(Form("Failed updating all seeds %d [%d].", mlayers, kNSeedPlanes));
2425 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2426 continue;
2427 }
2428
2429 // temporary exit door for the HLT
4302c900 2430 if(fReconstructor->IsHLT()){
be24510a 2431 // attach clusters to extrapolation chambers
2432 for(int iLayer=0; iLayer<kNPlanes-kNSeedPlanes; iLayer++){
2433 Int_t jLayer = planesExt[iLayer];
2434 if(!(chamber = stack[jLayer])) continue;
2435 cseed[jLayer].AttachClustersIter(chamber, 1000.);
2436 }
4302c900 2437 fTrackQuality[ntracks] = 1.; // dummy value
2438 ntracks++;
218ba867 2439 if(ntracks == kMaxTracksStack) return ntracks;
4302c900 2440 cseed += 6;
2441 continue;
2442 }
2443
be24510a 2444
d611c74f 2445 // fit tracklets and cook likelihood
2446 FitTiltedRieman(&cseed[0], kTRUE);// Update Seeds and calculate Likelihood
91834b8d 2447 Double_t like = CookLikelihood(&cseed[0], planes); // to be checked
d611c74f 2448
3a039a31 2449 if (TMath::Log(1.E-9 + like) < fReconstructor->GetRecoParam() ->GetTrackLikelihood()){
d611c74f 2450 //AliInfo(Form("Failed likelihood %f[%e].", TMath::Log(1.E-9 + like), like));
2451 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2452 continue;
2453 }
2454 //AliInfo(Form("Passed likelihood %f[%e].", TMath::Log(1.E-9 + like), like));
2455
2456 // book preliminary results
2457 seedQuality[ntracks] = like;
2458 fSeedLayer[ntracks] = config;/*sLayer;*/
2459
2460 // attach clusters to the extrapolation seeds
d611c74f 2461 Int_t nusedf = 0; // debug value
be24510a 2462 for(int iLayer=0; iLayer<kNPlanes-kNSeedPlanes; iLayer++){
2463 Int_t jLayer = planesExt[iLayer];
d611c74f 2464 if(!(chamber = stack[jLayer])) continue;
d611c74f 2465
2466 // fit extrapolated seed
2467 if ((jLayer == 0) && !(cseed[1].IsOK())) continue;
2468 if ((jLayer == 5) && !(cseed[4].IsOK())) continue;
2469 AliTRDseedV1 pseed = cseed[jLayer];
2470 if(!pseed.AttachClustersIter(chamber, 1000.)) continue;
2471 cseed[jLayer] = pseed;
2472 nusedf += cseed[jLayer].GetNUsed(); // debug value
2473 FitTiltedRieman(cseed, kTRUE);
2474 }
2475
2476 // AliInfo("Extrapolation done.");
2477 // Debug Stream containing all the 6 tracklets
3a039a31 2478 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){
d611c74f 2479 TTreeSRedirector &cstreamer = *fgDebugStreamer;
2480 TLinearFitter *tiltedRieman = GetTiltedRiemanFitter();
2481 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2482 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2483 cstreamer << "MakeSeeds1"
2484 << "EventNumber=" << eventNumber
2485 << "CandidateNumber=" << candidateNumber
2486 << "S0.=" << &cseed[0]
2487 << "S1.=" << &cseed[1]
2488 << "S2.=" << &cseed[2]
2489 << "S3.=" << &cseed[3]
2490 << "S4.=" << &cseed[4]
2491 << "S5.=" << &cseed[5]
2492 << "FitterT.=" << tiltedRieman
2493 << "\n";
2494 }
2495
fb872574 2496 if(fReconstructor->GetRecoParam()->HasImproveTracklets() && ImproveSeedQuality(stack, cseed) < 4){
d611c74f 2497 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2498 continue;
2499 }
2500 //AliInfo("Improve seed quality done.");
2501
2502 // fit full track and cook likelihoods
2503 // Double_t curv = FitRieman(&cseed[0], chi2);
2504 // Double_t chi2ZF = chi2[0] / TMath::Max((mlayers - 3.), 1.);
2505 // Double_t chi2RF = chi2[1] / TMath::Max((mlayers - 3.), 1.);
2506
2507 // do the final track fitting (Once with vertex constraint and once without vertex constraint)
2508 Double_t chi2Vals[3];
2509 chi2Vals[0] = FitTiltedRieman(&cseed[0], kFALSE);
91834b8d 2510 if(fReconstructor->GetRecoParam()->IsVertexConstrained())
d611c74f 2511 chi2Vals[1] = FitTiltedRiemanConstraint(&cseed[0], GetZ()); // Do Vertex Constrained fit if desired
2512 else
2513 chi2Vals[1] = 1.;
2514 chi2Vals[2] = GetChi2Z(&cseed[0]) / TMath::Max((mlayers - 3.), 1.);
2515 // Chi2 definitions in testing stage
2516 //chi2Vals[2] = GetChi2ZTest(&cseed[0]);
2517 fTrackQuality[ntracks] = CalculateTrackLikelihood(&cseed[0], &chi2Vals[0]);
2518 //AliInfo("Hyperplane fit done\n");
2519
2520 // finalize tracklets
2521 Int_t labels[12];
2522 Int_t outlab[24];
2523 Int_t nlab = 0;
2524 for (Int_t iLayer = 0; iLayer < 6; iLayer++) {
2525 if (!cseed[iLayer].IsOK()) continue;
2526
2527 if (cseed[iLayer].GetLabels(0) >= 0) {
2528 labels[nlab] = cseed[iLayer].GetLabels(0);
2529 nlab++;
2530 }
2531
2532 if (cseed[iLayer].GetLabels(1) >= 0) {
2533 labels[nlab] = cseed[iLayer].GetLabels(1);
2534 nlab++;
2535 }
2536 }
2537 Freq(nlab,labels,outlab,kFALSE);
2538 Int_t label = outlab[0];
2539 Int_t frequency = outlab[1];
2540 for (Int_t iLayer = 0; iLayer < 6; iLayer++) {
2541 cseed[iLayer].SetFreq(frequency);
2542 cseed[iLayer].SetChi2Z(chi2[1]);
2543 }
2544
3a039a31 2545 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){
d611c74f 2546 TTreeSRedirector &cstreamer = *fgDebugStreamer;
2547 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2548 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2549 TLinearFitter *fitterTC = GetTiltedRiemanFitterConstraint();
2550 TLinearFitter *fitterT = GetTiltedRiemanFitter();
91834b8d 2551 Int_t ncls = 0;
2552 for(Int_t iseed = 0; iseed < kNPlanes; iseed++){
2553 ncls += cseed[iseed].IsOK() ? cseed[iseed].GetN2() : 0;
2554 }
d611c74f 2555 cstreamer << "MakeSeeds2"
2556 << "EventNumber=" << eventNumber
2557 << "CandidateNumber=" << candidateNumber
2558 << "Chi2TR=" << chi2Vals[0]
2559 << "Chi2TC=" << chi2Vals[1]
2560 << "Nlayers=" << mlayers
91834b8d 2561 << "NClusters=" << ncls
d611c74f 2562 << "NUsedS=" << nUsedCl
2563 << "NUsed=" << nusedf
2564 << "Like=" << like
2565 << "S0.=" << &cseed[0]
2566 << "S1.=" << &cseed[1]
2567 << "S2.=" << &cseed[2]
2568 << "S3.=" << &cseed[3]
2569 << "S4.=" << &cseed[4]
2570 << "S5.=" << &cseed[5]
2571 << "Label=" << label
2572 << "Freq=" << frequency
2573 << "FitterT.=" << fitterT
2574 << "FitterTC.=" << fitterTC
2575 << "\n";
2576 }
2577
2578 ntracks++;
2579 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2580 if(ntracks == kMaxTracksStack){
2581 AliWarning(Form("Number of seeds reached maximum allowed (%d) in stack.", kMaxTracksStack));
2582 return ntracks;
2583 }
2584 cseed += 6;
41702fec 2585 }
2586 }
2587 }
41702fec 2588
2589 return ntracks;
e4f2f73d 2590}
2591
2592//_____________________________________________________________________________
0906e73e 2593AliTRDtrackV1* AliTRDtrackerV1::MakeTrack(AliTRDseedV1 *seeds, Double_t *params)
e4f2f73d 2594{
41702fec 2595 //
2596 // Build a TRD track out of tracklet candidates
2597 //
2598 // Parameters :
2599 // seeds : array of tracklets
2600 // params : track parameters (see MakeSeeds() function body for a detailed description)
2601 //
2602 // Output :
2603 // The TRD track.
2604 //
2605 // Detailed description
2606 //
2607 // To be discussed with Marian !!
2608 //
2609
41702fec 2610
2611 Double_t alpha = AliTRDgeometry::GetAlpha();
2612 Double_t shift = AliTRDgeometry::GetAlpha()/2.0;
2613 Double_t c[15];
2614
2615 c[ 0] = 0.2;
2616 c[ 1] = 0.0; c[ 2] = 2.0;
2617 c[ 3] = 0.0; c[ 4] = 0.0; c[ 5] = 0.02;
2618 c[ 6] = 0.0; c[ 7] = 0.0; c[ 8] = 0.0; c[ 9] = 0.1;
2619 c[10] = 0.0; c[11] = 0.0; c[12] = 0.0; c[13] = 0.0; c[14] = params[5]*params[5]*0.01;
2620
d20df6fc 2621 AliTRDtrackV1 track(seeds, &params[1], c, params[0], params[6]*alpha+shift);
2622 track.PropagateTo(params[0]-5.0);
91834b8d 2623 if(fReconstructor->IsHLT()){
2624 AliTRDseedV1 *ptrTracklet = 0x0;
2625 for(Int_t ip=0; ip<kNPlanes; ip++){
2626 track.UnsetTracklet(ip);
2627 ptrTracklet = SetTracklet(&seeds[ip]);
2628 track.SetTracklet(ptrTracklet, fTracklets->GetEntriesFast()-1);
2629 }
2630 return SetTrack(&track);
2631 }
393fda1c 2632
d20df6fc 2633 track.ResetCovariance(1);
e79f8eb0 2634 Int_t nc = TMath::Abs(FollowBackProlongation(track));
393fda1c 2635 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 5){
2636 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2637 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2638 Double_t p[5]; // Track Params for the Debug Stream
2639 track.GetExternalParameters(params[0], p);
2640 TTreeSRedirector &cs = *fgDebugStreamer;
2641 cs << "MakeTrack"
2642 << "EventNumber=" << eventNumber
2643 << "CandidateNumber=" << candidateNumber
2644 << "nc=" << nc
2645 << "X=" << params[0]
2646 << "Y=" << p[0]
2647 << "Z=" << p[1]
2648 << "snp=" << p[2]
2649 << "tnd=" << p[3]
2650 << "crv=" << p[4]
2651 << "Yin=" << params[1]
2652 << "Zin=" << params[2]
2653 << "snpin=" << params[3]
2654 << "tndin=" << params[4]
2655 << "crvin=" << params[5]
2656 << "track.=" << &track
2657 << "\n";
2658 }
d20df6fc 2659 if (nc < 30) return 0x0;
2660
2661 AliTRDtrackV1 *ptrTrack = SetTrack(&track);
215f7116 2662 ptrTrack->SetReconstructor(fReconstructor);
48f8adf3 2663 ptrTrack->CookLabel(.9);
24253b0a 2664
d20df6fc 2665 // computes PID for track
2666 ptrTrack->CookPID();
2667 // update calibration references using this track
48f8adf3 2668 AliTRDCalibraFillHisto *calibra = AliTRDCalibraFillHisto::Instance();
2669 if (!calibra){
2670 AliInfo("Could not get Calibra instance\n");
2671 if(calibra->GetHisto2d()) calibra->UpdateHistogramsV1(ptrTrack);
2672 }
d20df6fc 2673 return ptrTrack;
e4f2f73d 2674}
2675
0906e73e 2676
2677//____________________________________________________________________
eb38ed55 2678Int_t AliTRDtrackerV1::ImproveSeedQuality(AliTRDtrackingChamber **stack, AliTRDseedV1 *cseed)
e4f2f73d 2679{
41702fec 2680 //
2681 // Sort tracklets according to "quality" and try to "improve" the first 4 worst
2682 //
2683 // Parameters :
2684 // layers : Array of propagation layers for a stack/supermodule
2685 // cseed : Array of 6 seeding tracklets which has to be improved
2686 //
2687 // Output :
2688 // cssed : Improved seeds
2689 //
2690 // Detailed description
2691 //
2692 // Iterative procedure in which new clusters are searched for each
2693 // tracklet seed such that the seed quality (see AliTRDseed::GetQuality())
2694 // can be maximized. If some optimization is found the old seeds are replaced.
2695 //
2696 // debug level: 7
2697 //
2698
2699 // make a local working copy
2700 AliTRDtrackingChamber *chamber = 0x0;
2701 AliTRDseedV1 bseed[6];
2702 Int_t nLayers = 0;
2703 for (Int_t jLayer = 0; jLayer < 6; jLayer++) bseed[jLayer] = cseed[jLayer];
2704
2705 Float_t lastquality = 10000.0;
2706 Float_t lastchi2 = 10000.0;
2707 Float_t chi2 = 1000.0;
2708
2709 for (Int_t iter = 0; iter < 4; iter++) {
2710 Float_t sumquality = 0.0;
2711 Float_t squality[6];
2712 Int_t sortindexes[6];
2713
2714 for (Int_t jLayer = 0; jLayer < 6; jLayer++) {
3a039a31 2715 squality[jLayer] = bseed[jLayer].IsOK() ? bseed[jLayer].GetQuality(kTRUE) : 1000.;
41702fec 2716 sumquality += squality[jLayer];
2717 }
2718 if ((sumquality >= lastquality) || (chi2 > lastchi2)) break;
2719
2720 nLayers = 0;
2721 lastquality = sumquality;
2722 lastchi2 = chi2;
2723 if (iter > 0) for (Int_t jLayer = 0; jLayer < 6; jLayer++) cseed[jLayer] = bseed[jLayer];
2724
2725 TMath::Sort(6, squality, sortindexes, kFALSE);
2726 for (Int_t jLayer = 5; jLayer > 1; jLayer--) {
2727 Int_t bLayer = sortindexes[jLayer];
2728 if(!(chamber = stack[bLayer])) continue;
2729 bseed[bLayer].AttachClustersIter(chamber, squality[bLayer], kTRUE);
2730 if(bseed[bLayer].IsOK()) nLayers++;
2731 }
2732
2733 chi2 = FitTiltedRieman(bseed, kTRUE);
3a039a31 2734 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 7){
41702fec 2735 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2736 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2737 TLinearFitter *tiltedRieman = GetTiltedRiemanFitter();
2738 TTreeSRedirector &cstreamer = *fgDebugStreamer;
2739 cstreamer << "ImproveSeedQuality"
2740 << "EventNumber=" << eventNumber
2741 << "CandidateNumber=" << candidateNumber
2742 << "Iteration=" << iter
2743 << "S0.=" << &bseed[0]
2744 << "S1.=" << &bseed[1]
2745 << "S2.=" << &bseed[2]
2746 << "S3.=" << &bseed[3]
2747 << "S4.=" << &bseed[4]
2748 << "S5.=" << &bseed[5]
2749 << "FitterT.=" << tiltedRieman
2750 << "\n";
2751 }
2752 } // Loop: iter
2753
2754 // we are sure that at least 2 tracklets are OK !
2755 return nLayers+2;
e4f2f73d 2756}
2757
eb38ed55 2758//_________________________________________________________________________
2759Double_t AliTRDtrackerV1::CalculateTrackLikelihood(AliTRDseedV1 *tracklets, Double_t *chi2){
41702fec 2760 //
2761 // Calculates the Track Likelihood value. This parameter serves as main quality criterion for
2762 // the track selection
2763 // The likelihood value containes:
2764 // - The chi2 values from the both fitters and the chi2 values in z-direction from a linear fit
2765 // - The Sum of the Parameter |slope_ref - slope_fit|/Sigma of the tracklets
2766 // For all Parameters an exponential dependency is used
2767 //
2768 // Parameters: - Array of tracklets (AliTRDseedV1) related to the track candidate
2769 // - Array of chi2 values:
2770 // * Non-Constrained Tilted Riemann fit
2771 // * Vertex-Constrained Tilted Riemann fit
2772 // * z-Direction from Linear fit
2773 // Output: - The calculated track likelihood
2774 //
2775 // debug level 2
2776 //
2777
2778 Double_t sumdaf = 0, nLayers = 0;
2779 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
2780 if(!tracklets[iLayer].IsOK()) continue;
2781 sumdaf += TMath::Abs((tracklets[iLayer].GetYfit(1) - tracklets[iLayer].GetYref(1))/ tracklets[iLayer].GetSigmaY2());
2782 nLayers++;
2783 }
2784 sumdaf /= Float_t (nLayers - 2.0);
2785
2786 Double_t likeChi2Z = TMath::Exp(-chi2[2] * 0.14); // Chi2Z
3a039a31 2787 Double_t likeChi2TC = (fReconstructor->GetRecoParam() ->IsVertexConstrained()) ?
d20df6fc 2788 TMath::Exp(-chi2[1] * 0.677) : 1; // Constrained Tilted Riemann
41702fec 2789 Double_t likeChi2TR = TMath::Exp(-chi2[0] * 0.78); // Non-constrained Tilted Riemann
2790 Double_t likeAF = TMath::Exp(-sumdaf * 3.23);
2791 Double_t trackLikelihood = likeChi2Z * likeChi2TR * likeAF;
2792
3a039a31 2793 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){
41702fec 2794 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2795 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2796 TTreeSRedirector &cstreamer = *fgDebugStreamer;
2797 cstreamer << "CalculateTrackLikelihood0"
2798 << "EventNumber=" << eventNumber
2799 << "CandidateNumber=" << candidateNumber
2800 << "LikeChi2Z=" << likeChi2Z
2801 << "LikeChi2TR=" << likeChi2TR
2802 << "LikeChi2TC=" << likeChi2TC
2803 << "LikeAF=" << likeAF
2804 << "TrackLikelihood=" << trackLikelihood
2805 << "\n";
2806 }
2807
2808 return trackLikelihood;
e4f2f73d 2809}
2810
2811//____________________________________________________________________
91834b8d 2812Double_t AliTRDtrackerV1::CookLikelihood(AliTRDseedV1 *cseed, Int_t planes[4])
e4f2f73d 2813{
41702fec 2814 //
2815 // Calculate the probability of this track candidate.
2816 //
2817 // Parameters :
2818 // cseeds : array of candidate tracklets
2819 // planes : array of seeding planes (see seeding configuration)
2820 // chi2 : chi2 values (on the Z and Y direction) from the rieman fit of the track.
2821 //
2822 // Output :
2823 // likelihood value
2824 //
2825 // Detailed description
2826 //
2827 // The track quality is estimated based on the following 4 criteria:
2828 // 1. precision of the rieman fit on the Y direction (likea)
2829 // 2. chi2 on the Y direction (likechi2y)
2830 // 3. chi2 on the Z direction (likechi2z)
2831 // 4. number of attached clusters compared to a reference value
2832 // (see AliTRDrecoParam::fkFindable) (likeN)
2833 //
2834 // The distributions for each type of probabilities are given below as of
2835 // (date). They have to be checked to assure consistency of estimation.
2836 //
2837
2838 // ratio of the total number of clusters/track which are expected to be found by the tracker.
91834b8d 2839 const AliTRDrecoParam *fRecoPars = fReconstructor->GetRecoParam();
41702fec 2840
91834b8d 2841 Double_t chi2y = GetChi2Y(&cseed[0]);
2842 Double_t chi2z = GetChi2Z(&cseed[0]);
2843
8ae98148 2844 Float_t nclusters = 0.;
41702fec 2845 Double_t sumda = 0.;
2846 for(UChar_t ilayer = 0; ilayer < 4; ilayer++){
2847 Int_t jlayer = planes[ilayer];
2848 nclusters += cseed[jlayer].GetN2();
2849 sumda += TMath::Abs(cseed[jlayer].GetYfitR(1) - cseed[jlayer].GetYref(1));
2850 }
8ae98148 2851 nclusters *= .25;
2852
91834b8d 2853 Double_t likea = TMath::Exp(-sumda * fRecoPars->GetPhiCut());
41702fec 2854 Double_t likechi2y = 0.0000000001;
91834b8d 2855 if (fReconstructor->IsCosmic() || chi2y < 0.5) likechi2y += TMath::Exp(-TMath::Sqrt(chi2y) * fRecoPars->GetChi2YCut());
2856 Double_t likechi2z = TMath::Exp(-chi2z * fRecoPars->GetChi2ZCut());
8ae98148 2857 Double_t likeN = TMath::Exp(-(fRecoPars->GetNMeanClusters() - nclusters) / fRecoPars->GetNSigmaClusters());
41702fec 2858 Double_t like = likea * likechi2y * likechi2z * likeN;
2859
2860 // 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 2861 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){
41702fec 2862 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2863 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
91834b8d 2864 Int_t nTracklets = 0; Float_t mean_ncls = 0;
2865 for(Int_t iseed=0; iseed < kNPlanes; iseed++){
2866 if(!cseed[iseed].IsOK()) continue;
2867 nTracklets++;
2868 mean_ncls += cseed[iseed].GetN2();
2869 }
2870 if(nTracklets) mean_ncls /= nTracklets;
41702fec 2871 // The Debug Stream contains the seed
2872 TTreeSRedirector &cstreamer = *fgDebugStreamer;
2873 cstreamer << "CookLikelihood"
2874 << "EventNumber=" << eventNumber
2875 << "CandidateNumber=" << candidateNumber
2876 << "tracklet0.=" << &cseed[0]
2877 << "tracklet1.=" << &cseed[1]
2878 << "tracklet2.=" << &cseed[2]
2879 << "tracklet3.=" << &cseed[3]
2880 << "tracklet4.=" << &cseed[4]
2881 << "tracklet5.=" << &cseed[5]
2882 << "sumda=" << sumda
91834b8d 2883 << "chi2y=" << chi2y
2884 << "chi2z=" << chi2z
41702fec 2885 << "likea=" << likea
2886 << "likechi2y=" << likechi2y
2887 << "likechi2z=" << likechi2z
2888 << "nclusters=" << nclusters
2889 << "likeN=" << likeN
2890 << "like=" << like
91834b8d 2891 << "meanncls=" << mean_ncls
41702fec 2892 << "\n";
2893 }
2894
2895 return like;
e4f2f73d 2896}
2897
eb38ed55 2898
e4f2f73d 2899
2900//____________________________________________________________________
0906e73e 2901void AliTRDtrackerV1::GetSeedingConfig(Int_t iconfig, Int_t planes[4])
e4f2f73d 2902{
41702fec 2903 //
2904 // Map seeding configurations to detector planes.
2905 //
2906 // Parameters :
2907 // iconfig : configuration index
2908 // planes : member planes of this configuration. On input empty.
2909 //
2910 // Output :
2911 // planes : contains the planes which are defining the configuration
2912 //
2913 // Detailed description
2914 //
2915 // Here is the list of seeding planes configurations together with
2916 // their topological classification:
2917 //
2918 // 0 - 5432 TQ 0
2919 // 1 - 4321 TQ 0
2920 // 2 - 3210 TQ 0
2921 // 3 - 5321 TQ 1
2922 // 4 - 4210 TQ 1
2923 // 5 - 5431 TQ 1
2924 // 6 - 4320 TQ 1
2925 // 7 - 5430 TQ 2
2926 // 8 - 5210 TQ 2
2927 // 9 - 5421 TQ 3
2928 // 10 - 4310 TQ 3
2929 // 11 - 5410 TQ 4
2930 // 12 - 5420 TQ 5
2931 // 13 - 5320 TQ 5
2932 // 14 - 5310 TQ 5
2933 //
2934 // The topologic quality is modeled as follows:
2935 // 1. The general model is define by the equation:
2936 // p(conf) = exp(-conf/2)
2937 // 2. According to the topologic classification, configurations from the same
2938 // class are assigned the agerage value over the model values.
2939 // 3. Quality values are normalized.
2940 //
2941 // The topologic quality distribution as function of configuration is given below:
2942 //Begin_Html
2943 // <img src="gif/topologicQA.gif">
2944 //End_Html
2945 //
2946
2947 switch(iconfig){
2948 case 0: // 5432 TQ 0
2949 planes[0] = 2;
2950 planes[1] = 3;
2951 planes[2] = 4;
2952 planes[3] = 5;
2953 break;
2954 case 1: // 4321 TQ 0
2955 planes[0] = 1;
2956 planes[1] = 2;
2957 planes[2] = 3;
2958 planes[3] = 4;
2959 break;
2960 case 2: // 3210 TQ 0
2961 planes[0] = 0;
2962 planes[1] = 1;
2963 planes[2] = 2;
2964 planes[3] = 3;
2965 break;
2966 case 3: // 5321 TQ 1
2967 planes[0] = 1;
2968 planes[1] = 2;
2969 planes[2] = 3;
2970 planes[3] = 5;
2971 break;
2972 case 4: // 4210 TQ 1
2973 planes[0] = 0;
2974 planes[1] = 1;
2975 planes[2] = 2;
2976 planes[3] = 4;
2977 break;
2978 case 5: // 5431 TQ 1
2979 planes[0] = 1;
2980 planes[1] = 3;
2981 planes[2] = 4;
2982 planes[3] = 5;
2983 break;
2984 case 6: // 4320 TQ 1
2985 planes[0] = 0;
2986 planes[1] = 2;
2987 planes[2] = 3;
2988 planes[3] = 4;
2989 break;
2990 case 7: // 5430 TQ 2
2991 planes[0] = 0;
2992 planes[1] = 3;
2993 planes[2] = 4;
2994 planes[3] = 5;
2995 break;
2996 case 8: // 5210 TQ 2
2997 planes[0] = 0;
2998 planes[1] = 1;
2999 planes[2] = 2;
3000 planes[3] = 5;
3001 break;
3002 case 9: // 5421 TQ 3
3003 planes[0] = 1;
3004 planes[1] = 2;
3005 planes[2] = 4;
3006 planes[3] = 5;
3007 break;
3008 case 10: // 4310 TQ 3
3009 planes[0] = 0;
3010 planes[1] = 1;
3011 planes[2] = 3;
3012 planes[3] = 4;
3013 break;
3014 case 11: // 5410 TQ 4
3015 planes[0] = 0;
3016 planes[1] = 1;
3017 planes[2] = 4;
3018 planes[3] = 5;
3019 break;
3020 case 12: // 5420 TQ 5
3021 planes[0] = 0;
3022 planes[1] = 2;
3023 planes[2] = 4;
3024 planes[3] = 5;
3025 break;
3026 case 13: // 5320 TQ 5
3027 planes[0] = 0;
3028 planes[1] = 2;
3029 planes[2] = 3;
3030 planes[3] = 5;
3031 break;
3032 case 14: // 5310 TQ 5
3033 planes[0] = 0;
3034 planes[1] = 1;
3035 planes[2] = 3;
3036 planes[3] = 5;
3037 break;
3038 }
e4f2f73d 3039}
3040
3041//____________________________________________________________________
0906e73e 3042void AliTRDtrackerV1::GetExtrapolationConfig(Int_t iconfig, Int_t planes[2])
e4f2f73d 3043{
41702fec 3044 //
3045 // Returns the extrapolation planes for a seeding configuration.
3046 //
3047 // Parameters :
3048 // iconfig : configuration index
3049 // planes : planes which are not in this configuration. On input empty.
3050 //
3051 // Output :
3052 // planes : contains the planes which are not in the configuration
3053 //
3054 // Detailed description
3055 //
3056
3057 switch(iconfig){
3058 case 0: // 5432 TQ 0
3059 planes[0] = 1;
3060 planes[1] = 0;
3061 break;
3062 case 1: // 4321 TQ 0
3063 planes[0] = 5;
3064 planes[1] = 0;
3065 break;
3066 case 2: // 3210 TQ 0
3067 planes[0] = 4;
3068 planes[1] = 5;
3069 break;
3070 case 3: // 5321 TQ 1
3071 planes[0] = 4;
3072 planes[1] = 0;
3073 break;
3074 case 4: // 4210 TQ 1
3075 planes[0] = 5;
3076 planes[1] = 3;
3077 break;
3078 case 5: // 5431 TQ 1
3079 planes[0] = 2;
3080 planes[1] = 0;
3081 break;
3082 case 6: // 4320 TQ 1
3083 planes[0] = 5;
3084 planes[1] = 1;
3085 break;
3086 case 7: // 5430 TQ 2
3087 planes[0] = 2;
3088 planes[1] = 1;
3089 break;
3090 case 8: // 5210 TQ 2
3091 planes[0] = 4;
3092 planes[1] = 3;
3093 break;
3094 case 9: // 5421 TQ 3
3095 planes[0] = 3;
3096 planes[1] = 0;
3097 break;
3098 case 10: // 4310 TQ 3
3099 planes[0] = 5;
3100 planes[1] = 2;
3101 break;
3102 case 11: // 5410 TQ 4
3103 planes[0] = 3;
3104 planes[1] = 2;
3105 break;
3106 case 12: // 5420 TQ 5
3107 planes[0] = 3;
3108 planes[1] = 1;
3109 break;
3110 case 13: // 5320 TQ 5
3111 planes[0] = 4;
3112 planes[1] = 1;
3113 break;
3114 case 14: // 5310 TQ 5
3115 planes[0] = 4;
3116 planes[1] = 2;
3117 break;
3118 }
e4f2f73d 3119}
eb38ed55 3120
3121//____________________________________________________________________
3122AliCluster* AliTRDtrackerV1::GetCluster(Int_t idx) const
3123{
41702fec 3124 Int_t ncls = fClusters->GetEntriesFast();
2f7514a6 3125 return idx >= 0 && idx < ncls ? (AliCluster*)fClusters->UncheckedAt(idx) : 0x0;
eb38ed55 3126}
3127
bb56afff 3128//____________________________________________________________________
3b57a3f7 3129AliTRDseedV1* AliTRDtrackerV1::GetTracklet(Int_t idx) const
3130{
41702fec 3131 Int_t ntrklt = fTracklets->GetEntriesFast();
2f7514a6 3132 return idx >= 0 && idx < ntrklt ? (AliTRDseedV1*)fTracklets->UncheckedAt(idx) : 0x0;
3b57a3f7 3133}
3134
3135//____________________________________________________________________
3136AliKalmanTrack* AliTRDtrackerV1::GetTrack(Int_t idx) const
3137{
41702fec 3138 Int_t ntrk = fTracks->GetEntriesFast();
2f7514a6 3139 return idx >= 0 && idx < ntrk ? (AliKalmanTrack*)fTracks->UncheckedAt(idx) : 0x0;
3b57a3f7 3140}
3141
3142//____________________________________________________________________
bb56afff 3143Float_t AliTRDtrackerV1::CalculateReferenceX(AliTRDseedV1 *tracklets){
41702fec 3144 //
3145 // Calculates the reference x-position for the tilted Rieman fit defined as middle
3146 // of the stack (middle between layers 2 and 3). For the calculation all the tracklets
3147 // are taken into account
3148 //
3149 // Parameters: - Array of tracklets(AliTRDseedV1)
3150 //
3151 // Output: - The reference x-position(Float_t)
3152 //
3153 Int_t nDistances = 0;
3154 Float_t meanDistance = 0.;
3155 Int_t startIndex = 5;
3156 for(Int_t il =5; il > 0; il--){
3157 if(tracklets[il].IsOK() && tracklets[il -1].IsOK()){
3158 Float_t xdiff = tracklets[il].GetX0() - tracklets[il -1].GetX0();
3159 meanDistance += xdiff;
3160 nDistances++;
3161 }
3162 if(tracklets[il].IsOK()) startIndex = il;
3163 }
3164 if(tracklets[0].IsOK()) startIndex = 0;
3165 if(!nDistances){
3166 // We should normally never get here
3167 Float_t xpos[2]; memset(xpos, 0, sizeof(Float_t) * 2);
3168 Int_t iok = 0, idiff = 0;
3169 // This attempt is worse and should be avoided:
3170 // check for two chambers which are OK and repeat this without taking the mean value
3171 // Strategy avoids a division by 0;
3172 for(Int_t il = 5; il >= 0; il--){
3173 if(tracklets[il].IsOK()){
3174 xpos[iok] = tracklets[il].GetX0();
3175 iok++;
3176 startIndex = il;
3177 }
3178 if(iok) idiff++; // to get the right difference;
3179 if(iok > 1) break;
3180 }
3181 if(iok > 1){
3182 meanDistance = (xpos[0] - xpos[1])/idiff;
3183 }
3184 else{
3185 // we have do not even have 2 layers which are OK? The we do not need to fit at all
3186 return 331.;
3187 }
3188 }
3189 else{
3190 meanDistance /= nDistances;
3191 }
3192 return tracklets[startIndex].GetX0() + (2.5 - startIndex) * meanDistance - 0.5 * (AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick());
bb56afff 3193}
eb38ed55 3194
3195//_____________________________________________________________________________
3196Int_t AliTRDtrackerV1::Freq(Int_t n, const Int_t *inlist
41702fec 3197 , Int_t *outlist, Bool_t down)
eb38ed55 3198{
41702fec 3199 //
3200 // Sort eleements according occurancy
3201 // The size of output array has is 2*n
3202 //
3203
3204 if (n <= 0) {
3205 return 0;
3206 }
3207
3208 Int_t *sindexS = new Int_t[n]; // Temporary array for sorting
3209 Int_t *sindexF = new Int_t[2*n];
3210 for (Int_t i = 0; i < n; i++) {
3211 sindexF[i] = 0;
3212 }
3213
3214 TMath::Sort(n,inlist,sindexS,down);
3215
3216 Int_t last = inlist[sindexS[0]];
3217 Int_t val = last;
3218 sindexF[0] = 1;
3219 sindexF[0+n] = last;
3220 Int_t countPos = 0;
3221
3222 // Find frequency
3223 for (Int_t i = 1; i < n; i++) {
3224 val = inlist[sindexS[i]];
3225 if (last == val) {
3226 sindexF[countPos]++;
3227 }
3228 else {
3229 countPos++;
3230 sindexF[countPos+n] = val;
3231 sindexF[countPos]++;
3232 last = val;
3233 }
3234 }
3235 if (last == val) {
3236 countPos++;
3237 }
3238
3239 // Sort according frequency
3240 TMath::Sort(countPos,sindexF,sindexS,kTRUE);
3241
3242 for (Int_t i = 0; i < countPos; i++) {
3243 outlist[2*i ] = sindexF[sindexS[i]+n];
3244 outlist[2*i+1] = sindexF[sindexS[i]];
3245 }
3246
3247 delete [] sindexS;
3248 delete [] sindexF;
3249
3250 return countPos;
eb38ed55 3251
3252}
bb56afff 3253
06b32d95 3254
3255//____________________________________________________________________
3256void AliTRDtrackerV1::SetReconstructor(const AliTRDReconstructor *rec)
3257{
3258 fReconstructor = rec;
3259 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){
3260 if(!fgDebugStreamer){
3261 TDirectory *savedir = gDirectory;
3262 fgDebugStreamer = new TTreeSRedirector("TRD.TrackerDebug.root");
3263 savedir->cd();
3264 }
3265 }
acd241e9 3266}
3267
bb56afff 3268//_____________________________________________________________________________
3269Float_t AliTRDtrackerV1::GetChi2Y(AliTRDseedV1 *tracklets) const
3270{
41702fec 3271 // Chi2 definition on y-direction
3272
3273 Float_t chi2 = 0;
3274 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
3275 if(!tracklets[ipl].IsOK()) continue;
91834b8d 3276 Double_t distLayer = (tracklets[ipl].GetYfit(0) - tracklets[ipl].GetYref(0));// /tracklets[ipl].GetSigmaY();
41702fec 3277 chi2 += distLayer * distLayer;
3278 }
3279 return chi2;
bb56afff 3280}
3281
d611c74f 3282//____________________________________________________________________
3283void AliTRDtrackerV1::ResetSeedTB()
3284{
3285// reset buffer for seeding time bin layers. If the time bin
3286// layers are not allocated this function allocates them
3287
3288 for(Int_t isl=0; isl<kNSeedPlanes; isl++){
3289 if(!fSeedTB[isl]) fSeedTB[isl] = new AliTRDchamberTimeBin();
3290 else fSeedTB[isl]->Clear();
3291 }
3292}
3293
bb56afff 3294//_____________________________________________________________________________
3295Float_t AliTRDtrackerV1::GetChi2Z(AliTRDseedV1 *tracklets) const
3296{
91834b8d 3297 // Calculates normalized chi2 in z-direction
41702fec 3298
3299 Float_t chi2 = 0;
91834b8d 3300 // chi2 = Sum ((z - zmu)/sigma)^2
3301 // Sigma for the z direction is defined as half of the padlength
41702fec 3302 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
3303 if(!tracklets[ipl].IsOK()) continue;
91834b8d 3304 Double_t distLayer = (tracklets[ipl].GetMeanz() - tracklets[ipl].GetZref(0)); // /(tracklets[ipl].GetPadLength()/2);
41702fec 3305 chi2 += distLayer * distLayer;
3306 }
3307 return chi2;
bb56afff 3308}
8acca6a3 3309
3310///////////////////////////////////////////////////////
3311// //
3312// Resources of class AliTRDLeastSquare //
3313// //
3314///////////////////////////////////////////////////////
3315
3316//_____________________________________________________________________________
3317AliTRDtrackerV1::AliTRDLeastSquare::AliTRDLeastSquare(){
41702fec 3318 //
3319 // Constructor of the nested class AliTRDtrackFitterLeastSquare
3320 //
3321 memset(fParams, 0, sizeof(Double_t) * 2);
3322 memset(fSums, 0, sizeof(Double_t) * 5);
3323 memset(fCovarianceMatrix, 0, sizeof(Double_t) * 3);
8acca6a3 3324
3325}
3326
3327//_____________________________________________________________________________
3328void AliTRDtrackerV1::AliTRDLeastSquare::AddPoint(Double_t *x, Double_t y, Double_t sigmaY){
41702fec 3329 //
3330 // Adding Point to the fitter
3331 //
3332 Double_t weight = 1/(sigmaY * sigmaY);
3333 Double_t &xpt = *x;
3334 // printf("Adding point x = %f, y = %f, sigma = %f\n", xpt, y, sigmaY);
3335 fSums[0] += weight;
3336 fSums[1] += weight * xpt;
3337 fSums[2] += weight * y;
3338 fSums[3] += weight * xpt * y;
3339 fSums[4] += weight * xpt * xpt;
3340 fSums[5] += weight * y * y;
8acca6a3 3341}
3342
3343//_____________________________________________________________________________
3344void AliTRDtrackerV1::AliTRDLeastSquare::RemovePoint(Double_t *x, Double_t y, Double_t sigmaY){
41702fec 3345 //
3346 // Remove Point from the sample
3347 //
3348 Double_t weight = 1/(sigmaY * sigmaY);
3349 Double_t &xpt = *x;
3350 fSums[0] -= weight;
3351 fSums[1] -= weight * xpt;
3352 fSums[2] -= weight * y;
3353 fSums[3] -= weight * xpt * y;
3354 fSums[4] -= weight * xpt * xpt;
3355 fSums[5] -= weight * y * y;
8acca6a3 3356}
3357
3358//_____________________________________________________________________________
3359void AliTRDtrackerV1::AliTRDLeastSquare::Eval(){
41702fec 3360 //
3361 // Evaluation of the fit:
3362 // Calculation of the parameters
3363 // Calculation of the covariance matrix
3364 //
3365
3366 Double_t denominator = fSums[0] * fSums[4] - fSums[1] *fSums[1];
aec26713 3367 if(denominator==0) return;
3368
41702fec 3369 // for(Int_t isum = 0; isum < 5; isum++)
3370 // printf("fSums[%d] = %f\n", isum, fSums[isum]);
3371 // printf("denominator = %f\n", denominator);
3372 fParams[0] = (fSums[2] * fSums[4] - fSums[1] * fSums[3])/ denominator;
3373 fParams[1] = (fSums[0] * fSums[3] - fSums[1] * fSums[2]) / denominator;
3374 // printf("fParams[0] = %f, fParams[1] = %f\n", fParams[0], fParams[1]);
3375
3376 // Covariance matrix
3377 fCovarianceMatrix[0] = fSums[4] - fSums[1] * fSums[1] / fSums[0];
3378 fCovarianceMatrix[1] = fSums[5] - fSums[2] * fSums[2] / fSums[0];
3379 fCovarianceMatrix[2] = fSums[3] - fSums[1] * fSums[2] / fSums[0];
8acca6a3 3380}
3381
46b6abd7 3382//_____________________________________________________________________________
3383Double_t AliTRDtrackerV1::AliTRDLeastSquare::GetFunctionValue(Double_t *xpos) const {
41702fec 3384 //
3385 // Returns the Function value of the fitted function at a given x-position
3386 //
3387 return fParams[0] + fParams[1] * (*xpos);
46b6abd7 3388}
3389
3390//_____________________________________________________________________________
3391void AliTRDtrackerV1::AliTRDLeastSquare::GetCovarianceMatrix(Double_t *storage) const {
41702fec 3392 //
3393 // Copies the values of the covariance matrix into the storage
3394 //
3395 memcpy(storage, fCovarianceMatrix, sizeof(Double_t) * 3);
46b6abd7 3396}
3397