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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//____________________________________________________________________
eb38ed55 83AliTRDtrackerV1::AliTRDtrackerV1()
41702fec 84 :AliTracker()
85 ,fGeom(new AliTRDgeometry())
86 ,fClusters(0x0)
87 ,fTracklets(0x0)
88 ,fTracks(0x0)
89 ,fSieveSeeding(0)
e4f2f73d 90{
41702fec 91 //
92 // Default constructor.
93 //
a7ac01d2 94 AliTRDcalibDB *trd = 0x0;
95 if (!(trd = AliTRDcalibDB::Instance())) {
41702fec 96 AliFatal("Could not get calibration object");
97 }
a7ac01d2 98
99 if(!fgNTimeBins) fgNTimeBins = trd->GetNumberOfTimeBins();
41702fec 100
053767a4 101 for (Int_t isector = 0; isector < AliTRDgeometry::kNsector; isector++) new(&fTrSec[isector]) AliTRDtrackingSector(fGeom, isector);
d20df6fc 102
d611c74f 103 for(Int_t isl =0; isl<kNSeedPlanes; isl++) fSeedTB[isl] = 0x0;
d20df6fc 104
7e88424f 105 TDirectory *savedir = gDirectory;
106 fgDebugStreamer = new TTreeSRedirector("TRD.TrackerDebug.root");
107 savedir->cd();
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;}
124 if(fClusters) {fClusters->Delete(); delete fClusters;}
125 if(fGeom) delete fGeom;
e4f2f73d 126}
127
128//____________________________________________________________________
129Int_t AliTRDtrackerV1::Clusters2Tracks(AliESDEvent *esd)
130{
41702fec 131 //
132 // Steering stand alone tracking for full TRD detector
133 //
134 // Parameters :
135 // esd : The ESD event. On output it contains
136 // the ESD tracks found in TRD.
137 //
138 // Output :
139 // Number of tracks found in the TRD detector.
140 //
141 // Detailed description
142 // 1. Launch individual SM trackers.
143 // See AliTRDtrackerV1::Clusters2TracksSM() for details.
144 //
145
7e88424f 146 if(!AliTRDReconstructor::GetRecoParam()){
147 AliError("Reconstruction configuration not initialized.");
41702fec 148 return 0;
149 }
150
151 //AliInfo("Start Track Finder ...");
152 Int_t ntracks = 0;
053767a4 153 for(int ism=0; ism<AliTRDgeometry::kNsector; ism++){
41702fec 154 // for(int ism=1; ism<2; ism++){
155 //AliInfo(Form("Processing supermodule %i ...", ism));
156 ntracks += Clusters2TracksSM(ism, esd);
157 }
158 AliInfo(Form("Number of found tracks : %d", ntracks));
159 return ntracks;
e4f2f73d 160}
161
0906e73e 162
163//_____________________________________________________________________________
eb38ed55 164Bool_t AliTRDtrackerV1::GetTrackPoint(Int_t index, AliTrackPoint &p) const
0906e73e 165{
41702fec 166 //AliInfo(Form("Asking for tracklet %d", index));
167
2f7514a6 168 AliTRDseedV1 *tracklet = GetTracklet(index);
169 if (!tracklet) return kFALSE;
41702fec 170
171 // get detector for this tracklet
172 AliTRDcluster *cl = 0x0;
173 Int_t ic = 0; do; while(!(cl = tracklet->GetClusters(ic++)));
174 Int_t idet = cl->GetDetector();
175
176 Double_t local[3];
177 local[0] = tracklet->GetX0();
178 local[1] = tracklet->GetYfit(0);
179 local[2] = tracklet->GetZfit(0);
180 Double_t global[3];
181 fGeom->RotateBack(idet, local, global);
182 p.SetXYZ(global[0],global[1],global[2]);
183
184
185 // setting volume id
186 AliGeomManager::ELayerID iLayer = AliGeomManager::kTRD1;
053767a4 187 switch (fGeom->GetLayer(idet)) {
41702fec 188 case 0:
189 iLayer = AliGeomManager::kTRD1;
190 break;
191 case 1:
192 iLayer = AliGeomManager::kTRD2;
193 break;
194 case 2:
195 iLayer = AliGeomManager::kTRD3;
196 break;
197 case 3:
198 iLayer = AliGeomManager::kTRD4;
199 break;
200 case 4:
201 iLayer = AliGeomManager::kTRD5;
202 break;
203 case 5:
204 iLayer = AliGeomManager::kTRD6;
205 break;
206 };
053767a4 207 Int_t modId = fGeom->GetSector(idet) * fGeom->Nstack() + fGeom->GetStack(idet);
41702fec 208 UShort_t volid = AliGeomManager::LayerToVolUID(iLayer, modId);
209 p.SetVolumeID(volid);
210
211 return kTRUE;
0906e73e 212}
213
eb38ed55 214//____________________________________________________________________
215TLinearFitter* AliTRDtrackerV1::GetTiltedRiemanFitter()
216{
41702fec 217 if(!fgTiltedRieman) fgTiltedRieman = new TLinearFitter(4, "hyp4");
218 return fgTiltedRieman;
eb38ed55 219}
0906e73e 220
eb38ed55 221//____________________________________________________________________
222TLinearFitter* AliTRDtrackerV1::GetTiltedRiemanFitterConstraint()
223{
41702fec 224 if(!fgTiltedRiemanConstrained) fgTiltedRiemanConstrained = new TLinearFitter(2, "hyp2");
225 return fgTiltedRiemanConstrained;
eb38ed55 226}
41702fec 227
eb38ed55 228//____________________________________________________________________
229AliRieman* AliTRDtrackerV1::GetRiemanFitter()
230{
053767a4 231 if(!fgRieman) fgRieman = new AliRieman(AliTRDtrackingChamber::kNTimeBins * AliTRDgeometry::kNlayer);
41702fec 232 return fgRieman;
eb38ed55 233}
41702fec 234
0906e73e 235//_____________________________________________________________________________
236Int_t AliTRDtrackerV1::PropagateBack(AliESDEvent *event)
237{
41702fec 238 //
239 // Gets seeds from ESD event. The seeds are AliTPCtrack's found and
240 // backpropagated by the TPC tracker. Each seed is first propagated
241 // to the TRD, and then its prolongation is searched in the TRD.
242 // If sufficiently long continuation of the track is found in the TRD
243 // the track is updated, otherwise it's stored as originaly defined
244 // by the TPC tracker.
245 //
246
247 // Calibration monitor
248 AliTRDCalibraFillHisto *calibra = AliTRDCalibraFillHisto::Instance();
249 if (!calibra) AliInfo("Could not get Calibra instance\n");
250
251 Int_t found = 0; // number of tracks found
252 Float_t foundMin = 20.0;
253
d611c74f 254 Float_t *quality = 0x0;
255 Int_t *index = 0x0;
41702fec 256 Int_t nSeed = event->GetNumberOfTracks();
d611c74f 257 if(nSeed){
258 quality = new Float_t[nSeed];
259 index = new Int_t[nSeed];
260 for (Int_t iSeed = 0; iSeed < nSeed; iSeed++) {
261 AliESDtrack *seed = event->GetTrack(iSeed);
262 Double_t covariance[15];
263 seed->GetExternalCovariance(covariance);
264 quality[iSeed] = covariance[0] + covariance[2];
265 }
266 // Sort tracks according to covariance of local Y and Z
267 TMath::Sort(nSeed,quality,index,kFALSE);
41702fec 268 }
41702fec 269
270 // Backpropagate all seeds
271 Int_t expectedClr;
272 AliTRDtrackV1 track;
273 for (Int_t iSeed = 0; iSeed < nSeed; iSeed++) {
274
275 // Get the seeds in sorted sequence
276 AliESDtrack *seed = event->GetTrack(index[iSeed]);
277
278 // Check the seed status
279 ULong_t status = seed->GetStatus();
280 if ((status & AliESDtrack::kTPCout) == 0) continue;
281 if ((status & AliESDtrack::kTRDout) != 0) continue;
282
283 // Do the back prolongation
284 new(&track) AliTRDtrackV1(*seed);
285 //track->Print();
286 //Int_t lbl = seed->GetLabel();
287 //track.SetSeedLabel(lbl);
288 seed->UpdateTrackParams(&track, AliESDtrack::kTRDbackup); // Make backup
289 Float_t p4 = track.GetC();
ae3fbe1f 290 expectedClr = FollowBackProlongation(track);
291
292 if (expectedClr<0) continue; // Back prolongation failed
293
294 if(expectedClr){
d611c74f 295 found++;
41702fec 296 // computes PID for track
297 track.CookPID();
298 // update calibration references using this track
299 if(calibra->GetHisto2d()) calibra->UpdateHistogramsV1(&track);
300 // save calibration object
301 if ((track.GetNumberOfClusters() > 15) && (track.GetNumberOfClusters() > 0.5*expectedClr)) {
302 seed->UpdateTrackParams(&track, AliESDtrack::kTRDout);
303
304 track.UpdateESDtrack(seed);
305
306 // Add TRD track to ESDfriendTrack
7e88424f 307 if (AliTRDReconstructor::GetRecoParam()->GetStreamLevel() > 0 /*&& quality TODO*/){
41702fec 308 AliTRDtrackV1 *calibTrack = new AliTRDtrackV1(track);
309 calibTrack->SetOwner();
310 seed->AddCalibObject(calibTrack);
311 }
312 }
313 }
314
315 if ((TMath::Abs(track.GetC() - p4) / TMath::Abs(p4) < 0.2) ||(track.Pt() > 0.8)) {
316 //
317 // Make backup for back propagation
318 //
319 Int_t foundClr = track.GetNumberOfClusters();
320 if (foundClr >= foundMin) {
321 //AliInfo(Form("Making backup track ncls [%d]...", foundClr));
322 //track.CookdEdx();
323 //track.CookdEdxTimBin(seed->GetID());
324 track.CookLabel(1. - fgkLabelFraction);
325 if(track.GetBackupTrack()) UseClusters(track.GetBackupTrack());
326
327
328 // Sign only gold tracks
329 if (track.GetChi2() / track.GetNumberOfClusters() < 4) {
330 if ((seed->GetKinkIndex(0) == 0) && (track.Pt() < 1.5)) UseClusters(&track);
331 }
332 Bool_t isGold = kFALSE;
333
334 // Full gold track
335 if (track.GetChi2() / track.GetNumberOfClusters() < 5) {
336 if (track.GetBackupTrack()) seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup);
337
338 isGold = kTRUE;
339 }
340
341 // Almost gold track
342 if ((!isGold) && (track.GetNCross() == 0) && (track.GetChi2() / track.GetNumberOfClusters() < 7)) {
343 //seed->UpdateTrackParams(track, AliESDtrack::kTRDbackup);
344 if (track.GetBackupTrack()) seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup);
345
346 isGold = kTRUE;
347 }
348
349 if ((!isGold) && (track.GetBackupTrack())) {
350 if ((track.GetBackupTrack()->GetNumberOfClusters() > foundMin) && ((track.GetBackupTrack()->GetChi2()/(track.GetBackupTrack()->GetNumberOfClusters()+1)) < 7)) {
351 seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup);
352 isGold = kTRUE;
353 }
354 }
355
356 //if ((track->StatusForTOF() > 0) && (track->GetNCross() == 0) && (Float_t(track->GetNumberOfClusters()) / Float_t(track->GetNExpected()) > 0.4)) {
357 //seed->UpdateTrackParams(track->GetBackupTrack(), AliESDtrack::kTRDbackup);
358 //}
359 }
360 }
361
362 // Propagation to the TOF (I.Belikov)
363 if (track.IsStopped() == kFALSE) {
364 Double_t xtof = 371.0;
365 Double_t xTOF0 = 370.0;
366
367 Double_t c2 = track.GetSnp() + track.GetC() * (xtof - track.GetX());
368 if (TMath::Abs(c2) >= 0.99) continue;
369
ae3fbe1f 370 if (!PropagateToX(track, xTOF0, fgkMaxStep)) continue;
41702fec 371
372 // Energy losses taken to the account - check one more time
373 c2 = track.GetSnp() + track.GetC() * (xtof - track.GetX());
374 if (TMath::Abs(c2) >= 0.99) continue;
375
376 //if (!PropagateToX(*track,xTOF0,fgkMaxStep)) {
377 // fHBackfit->Fill(7);
378 //delete track;
379 // continue;
380 //}
381
382 Double_t ymax = xtof * TMath::Tan(0.5 * AliTRDgeometry::GetAlpha());
383 Double_t y;
384 track.GetYAt(xtof,GetBz(),y);
385 if (y > ymax) {
386 if (!track.Rotate( AliTRDgeometry::GetAlpha())) continue;
387 }else if (y < -ymax) {
388 if (!track.Rotate(-AliTRDgeometry::GetAlpha())) continue;
389 }
390
391 if (track.PropagateTo(xtof)) {
392 seed->UpdateTrackParams(&track, AliESDtrack::kTRDout);
393 track.UpdateESDtrack(seed);
41702fec 394 }
395 } else {
396 if ((track.GetNumberOfClusters() > 15) && (track.GetNumberOfClusters() > 0.5*expectedClr)) {
397 seed->UpdateTrackParams(&track, AliESDtrack::kTRDout);
398
399 track.UpdateESDtrack(seed);
41702fec 400 }
401 }
402
403 seed->SetTRDQuality(track.StatusForTOF());
404 seed->SetTRDBudget(track.GetBudget(0));
405 }
d611c74f 406 if(index) delete [] index;
407 if(quality) delete [] quality;
41702fec 408
409
410 AliInfo(Form("Number of seeds: %d", nSeed));
411 AliInfo(Form("Number of back propagated TRD tracks: %d", found));
412
d611c74f 413 // run stand alone tracking
7e88424f 414 if (AliTRDReconstructor::GetRecoParam()->IsSeeding()) Clusters2Tracks(event);
41702fec 415
416 return 0;
0906e73e 417}
418
419
420//____________________________________________________________________
421Int_t AliTRDtrackerV1::RefitInward(AliESDEvent *event)
422{
41702fec 423 //
424 // Refits tracks within the TRD. The ESD event is expected to contain seeds
425 // at the outer part of the TRD.
426 // The tracks are propagated to the innermost time bin
427 // of the TRD and the ESD event is updated
428 // Origin: Thomas KUHR (Thomas.Kuhr@cern.ch)
429 //
430
431 Int_t nseed = 0; // contor for loaded seeds
432 Int_t found = 0; // contor for updated TRD tracks
433
434
435 AliTRDtrackV1 track;
436 for (Int_t itrack = 0; itrack < event->GetNumberOfTracks(); itrack++) {
437 AliESDtrack *seed = event->GetTrack(itrack);
438 new(&track) AliTRDtrackV1(*seed);
439
440 if (track.GetX() < 270.0) {
441 seed->UpdateTrackParams(&track, AliESDtrack::kTRDbackup);
442 continue;
443 }
444
445 ULong_t status = seed->GetStatus();
446 if((status & AliESDtrack::kTRDout) == 0) continue;
447 if((status & AliESDtrack::kTRDin) != 0) continue;
448 nseed++;
449
450 track.ResetCovariance(50.0);
451
452 // do the propagation and processing
453 Bool_t kUPDATE = kFALSE;
454 Double_t xTPC = 250.0;
455 if(FollowProlongation(track)){
456 // Prolongate to TPC
457 if (PropagateToX(track, xTPC, fgkMaxStep)) { // -with update
458 seed->UpdateTrackParams(&track, AliESDtrack::kTRDrefit);
459 found++;
460 kUPDATE = kTRUE;
461 }
462 }
463
464 // Prolongate to TPC without update
465 if(!kUPDATE) {
466 AliTRDtrackV1 tt(*seed);
467 if (PropagateToX(tt, xTPC, fgkMaxStep)) seed->UpdateTrackParams(&tt, AliESDtrack::kTRDrefit);
468 }
469 }
470 AliInfo(Form("Number of loaded seeds: %d",nseed));
471 AliInfo(Form("Number of found tracks from loaded seeds: %d",found));
472
473 return 0;
0906e73e 474}
475
476
477//____________________________________________________________________
478Int_t AliTRDtrackerV1::FollowProlongation(AliTRDtrackV1 &t)
479{
41702fec 480 // Extrapolates the TRD track in the TPC direction.
481 //
482 // Parameters
483 // t : the TRD track which has to be extrapolated
484 //
485 // Output
486 // number of clusters attached to the track
487 //
488 // Detailed description
489 //
490 // Starting from current radial position of track <t> this function
491 // extrapolates the track through the 6 TRD layers. The following steps
492 // are being performed for each plane:
493 // 1. prepare track:
494 // a. get plane limits in the local x direction
495 // b. check crossing sectors
496 // c. check track inclination
497 // 2. search tracklet in the tracker list (see GetTracklet() for details)
498 // 3. evaluate material budget using the geo manager
499 // 4. propagate and update track using the tracklet information.
500 //
501 // Debug level 2
502 //
503
504 Int_t nClustersExpected = 0;
505 Int_t lastplane = 5; //GetLastPlane(&t);
506 for (Int_t iplane = lastplane; iplane >= 0; iplane--) {
507 Int_t index = 0;
508 AliTRDseedV1 *tracklet = GetTracklet(&t, iplane, index);
509 if(!tracklet) continue;
510 if(!tracklet->IsOK()) AliWarning("tracklet not OK");
511
512 Double_t x = tracklet->GetX0();
513 // reject tracklets which are not considered for inward refit
514 if(x > t.GetX()+fgkMaxStep) continue;
515
516 // append tracklet to track
517 t.SetTracklet(tracklet, index);
518
519 if (x < (t.GetX()-fgkMaxStep) && !PropagateToX(t, x+fgkMaxStep, fgkMaxStep)) break;
520 if (!AdjustSector(&t)) break;
521
522 // Start global position
523 Double_t xyz0[3];
524 t.GetXYZ(xyz0);
525
526 // End global position
527 Double_t alpha = t.GetAlpha(), y, z;
528 if (!t.GetProlongation(x,y,z)) break;
529 Double_t xyz1[3];
530 xyz1[0] = x * TMath::Cos(alpha) - y * TMath::Sin(alpha);
531 xyz1[1] = x * TMath::Sin(alpha) + y * TMath::Cos(alpha);
532 xyz1[2] = z;
533
534 // Get material budget
535 Double_t param[7];
536 AliTracker::MeanMaterialBudget(xyz0, xyz1, param);
537 Double_t xrho= param[0]*param[4];
538 Double_t xx0 = param[1]; // Get mean propagation parameters
539
540 // Propagate and update
541 t.PropagateTo(x, xx0, xrho);
542 if (!AdjustSector(&t)) break;
543
544 Double_t maxChi2 = t.GetPredictedChi2(tracklet);
545 if (maxChi2 < 1e+10 && t.Update(tracklet, maxChi2)){
546 nClustersExpected += tracklet->GetN();
547 }
548 }
549
7e88424f 550 if(AliTRDReconstructor::GetRecoParam()->GetStreamLevel() > 1){
41702fec 551 Int_t index;
552 for(int iplane=0; iplane<6; iplane++){
553 AliTRDseedV1 *tracklet = GetTracklet(&t, iplane, index);
554 if(!tracklet) continue;
555 t.SetTracklet(tracklet, index);
556 }
557
558 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
559 TTreeSRedirector &cstreamer = *fgDebugStreamer;
560 cstreamer << "FollowProlongation"
561 << "EventNumber=" << eventNumber
562 << "ncl=" << nClustersExpected
563 //<< "track.=" << &t
564 << "\n";
565 }
566
567 return nClustersExpected;
0906e73e 568
569}
570
571//_____________________________________________________________________________
572Int_t AliTRDtrackerV1::FollowBackProlongation(AliTRDtrackV1 &t)
573{
41702fec 574 // Extrapolates the TRD track in the TOF direction.
575 //
576 // Parameters
577 // t : the TRD track which has to be extrapolated
578 //
579 // Output
580 // number of clusters attached to the track
581 //
582 // Detailed description
583 //
584 // Starting from current radial position of track <t> this function
585 // extrapolates the track through the 6 TRD layers. The following steps
586 // are being performed for each plane:
587 // 1. prepare track:
588 // a. get plane limits in the local x direction
589 // b. check crossing sectors
590 // c. check track inclination
591 // 2. build tracklet (see AliTRDseed::AttachClusters() for details)
592 // 3. evaluate material budget using the geo manager
593 // 4. propagate and update track using the tracklet information.
594 //
595 // Debug level 2
596 //
597
598 Int_t nClustersExpected = 0;
599 Double_t clength = AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick();
600 AliTRDtrackingChamber *chamber = 0x0;
601
3b57a3f7 602 AliTRDseedV1 tracklet, *ptrTracklet = 0x0;
603
053767a4 604 // Loop through the TRD layers
605 for (Int_t ilayer = 0; ilayer < AliTRDgeometry::Nlayer(); ilayer++) {
41702fec 606 // BUILD TRACKLET IF NOT ALREADY BUILT
607 Double_t x = 0., y, z, alpha;
053767a4 608 ptrTracklet = t.GetTracklet(ilayer);
41702fec 609 if(!ptrTracklet){
053767a4 610 ptrTracklet = new(&tracklet) AliTRDseedV1(ilayer);
41702fec 611 alpha = t.GetAlpha();
053767a4 612 Int_t sector = Int_t(alpha/AliTRDgeometry::GetAlpha() + (alpha>0. ? 0 : AliTRDgeometry::kNsector));
41702fec 613
614 if(!fTrSec[sector].GetNChambers()) continue;
615
053767a4 616 if((x = fTrSec[sector].GetX(ilayer)) < 1.) continue;
41702fec 617
ae3fbe1f 618 if (!t.GetProlongation(x, y, z)) return -1;
053767a4 619 Int_t stack = fGeom->GetStack(z, ilayer);
41702fec 620 Int_t nCandidates = stack >= 0 ? 1 : 2;
621 z -= stack >= 0 ? 0. : 4.;
622
623 for(int icham=0; icham<nCandidates; icham++, z+=8){
053767a4 624 if((stack = fGeom->GetStack(z, ilayer)) < 0) continue;
41702fec 625
053767a4 626 if(!(chamber = fTrSec[sector].GetChamber(stack, ilayer))) continue;
41702fec 627
7e88424f 628 if(chamber->GetNClusters() < fgNTimeBins*AliTRDReconstructor::GetRecoParam()->GetFindableClusters()) continue;
41702fec 629
630 x = chamber->GetX();
631
053767a4 632 AliTRDpadPlane *pp = fGeom->GetPadPlane(ilayer, stack);
41702fec 633 tracklet.SetTilt(TMath::Tan(-TMath::DegToRad()*pp->GetTiltingAngle()));
634 tracklet.SetPadLength(pp->GetLengthIPad());
053767a4 635 tracklet.SetPlane(ilayer);
41702fec 636 tracklet.SetX0(x);
637 if(!tracklet.Init(&t)){
638 t.SetStopped(kTRUE);
639 return nClustersExpected;
640 }
641 if(!tracklet.AttachClustersIter(chamber, 1000.)) continue;
642 tracklet.Init(&t);
643
7e88424f 644 if(tracklet.GetN() < fgNTimeBins * AliTRDReconstructor::GetRecoParam()->GetFindableClusters()) continue;
41702fec 645
646 break;
647 }
648 }
649 if(!ptrTracklet->IsOK()){
650 if(x < 1.) continue; //temporary
ae3fbe1f 651 if(!PropagateToX(t, x-fgkMaxStep, fgkMaxStep)) return -1;
652 if(!AdjustSector(&t)) return -1;
653 if(TMath::Abs(t.GetSnp()) > fgkMaxSnp) return -1;
41702fec 654 continue;
655 }
656
657 // Propagate closer to the current chamber if neccessary
658 x -= clength;
ae3fbe1f 659 if (x > (fgkMaxStep + t.GetX()) && !PropagateToX(t, x-fgkMaxStep, fgkMaxStep)) return -1;
660 if (!AdjustSector(&t)) return -1;
661 if (TMath::Abs(t.GetSnp()) > fgkMaxSnp) return -1;
41702fec 662
663 // load tracklet to the tracker and the track
664 ptrTracklet = SetTracklet(ptrTracklet);
665 t.SetTracklet(ptrTracklet, fTracklets->GetEntriesFast()-1);
666
667
668 // Calculate the mean material budget along the path inside the chamber
669 //Calculate global entry and exit positions of the track in chamber (only track prolongation)
670 Double_t xyz0[3]; // entry point
671 t.GetXYZ(xyz0);
672 alpha = t.GetAlpha();
673 x = ptrTracklet->GetX0();
ae3fbe1f 674 if (!t.GetProlongation(x, y, z)) return -1;
41702fec 675 Double_t xyz1[3]; // exit point
676 xyz1[0] = x * TMath::Cos(alpha) - y * TMath::Sin(alpha);
677 xyz1[1] = +x * TMath::Sin(alpha) + y * TMath::Cos(alpha);
678 xyz1[2] = z;
679 Double_t param[7];
680 AliTracker::MeanMaterialBudget(xyz0, xyz1, param);
681 // The mean propagation parameters
682 Double_t xrho = param[0]*param[4]; // density*length
683 Double_t xx0 = param[1]; // radiation length
684
685 // Propagate and update track
ae3fbe1f 686 if (!t.PropagateTo(x, xx0, xrho)) return -1;
687 if (!AdjustSector(&t)) return -1;
41702fec 688 Double_t maxChi2 = t.GetPredictedChi2(ptrTracklet);
ae3fbe1f 689 if (!t.Update(ptrTracklet, maxChi2)) return -1;
690 if (maxChi2<1e+10) {
41702fec 691 nClustersExpected += ptrTracklet->GetN();
692 //t.SetTracklet(&tracklet, index);
693 }
694 // Reset material budget if 2 consecutive gold
053767a4 695 if(ilayer>0 && t.GetTracklet(ilayer-1) && ptrTracklet->GetN() + t.GetTracklet(ilayer-1)->GetN() > 20) t.SetBudget(2, 0.);
41702fec 696
697 // Make backup of the track until is gold
698 // TO DO update quality check of the track.
699 // consider comparison with fTimeBinsRange
700 Float_t ratio0 = ptrTracklet->GetN() / Float_t(fgNTimeBins);
701 //Float_t ratio1 = Float_t(t.GetNumberOfClusters()+1) / Float_t(t.GetNExpected()+1);
702 //printf("tracklet.GetChi2() %f [< 18.0]\n", tracklet.GetChi2());
703 //printf("ratio0 %f [> 0.8]\n", ratio0);
704 //printf("ratio1 %f [> 0.6]\n", ratio1);
705 //printf("ratio0+ratio1 %f [> 1.5]\n", ratio0+ratio1);
706 //printf("t.GetNCross() %d [== 0]\n", t.GetNCross());
707 //printf("TMath::Abs(t.GetSnp()) %f [< 0.85]\n", TMath::Abs(t.GetSnp()));
708 //printf("t.GetNumberOfClusters() %d [> 20]\n", t.GetNumberOfClusters());
709
710 if (//(tracklet.GetChi2() < 18.0) && TO DO check with FindClusters and move it to AliTRDseed::Update
711 (ratio0 > 0.8) &&
712 //(ratio1 > 0.6) &&
713 //(ratio0+ratio1 > 1.5) &&
714 (t.GetNCross() == 0) &&
715 (TMath::Abs(t.GetSnp()) < 0.85) &&
716 (t.GetNumberOfClusters() > 20)) t.MakeBackupTrack();
717
053767a4 718 } // end layers loop
41702fec 719
7e88424f 720 if(AliTRDReconstructor::GetRecoParam()->GetStreamLevel() > 1){
41702fec 721 TTreeSRedirector &cstreamer = *fgDebugStreamer;
722 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
723 //AliTRDtrackV1 *debugTrack = new AliTRDtrackV1(t);
724 //debugTrack->SetOwner();
725 cstreamer << "FollowBackProlongation"
726 << "EventNumber=" << eventNumber
727 << "ncl=" << nClustersExpected
728 //<< "track.=" << debugTrack
729 << "\n";
730 }
731
732 return nClustersExpected;
0906e73e 733}
734
eb38ed55 735//_________________________________________________________________________
736Float_t AliTRDtrackerV1::FitRieman(AliTRDseedV1 *tracklets, Double_t *chi2, Int_t *planes){
41702fec 737 //
738 // Fits a Riemann-circle to the given points without tilting pad correction.
739 // The fit is performed using an instance of the class AliRieman (equations
740 // and transformations see documentation of this class)
741 // Afterwards all the tracklets are Updated
742 //
743 // Parameters: - Array of tracklets (AliTRDseedV1)
744 // - Storage for the chi2 values (beginning with direction z)
745 // - Seeding configuration
746 // Output: - The curvature
747 //
748 AliRieman *fitter = AliTRDtrackerV1::GetRiemanFitter();
749 fitter->Reset();
750 Int_t allplanes[] = {0, 1, 2, 3, 4, 5};
751 Int_t *ppl = &allplanes[0];
752 Int_t maxLayers = 6;
753 if(planes){
754 maxLayers = 4;
755 ppl = planes;
756 }
757 for(Int_t il = 0; il < maxLayers; il++){
758 if(!tracklets[ppl[il]].IsOK()) continue;
759 fitter->AddPoint(tracklets[ppl[il]].GetX0(), tracklets[ppl[il]].GetYfitR(0), tracklets[ppl[il]].GetZProb(),1,10);
760 }
761 fitter->Update();
762 // Set the reference position of the fit and calculate the chi2 values
763 memset(chi2, 0, sizeof(Double_t) * 2);
764 for(Int_t il = 0; il < maxLayers; il++){
765 // Reference positions
766 tracklets[ppl[il]].Init(fitter);
767
768 // chi2
769 if((!tracklets[ppl[il]].IsOK()) && (!planes)) continue;
770 chi2[0] += tracklets[ppl[il]].GetChi2Y();
771 chi2[1] += tracklets[ppl[il]].GetChi2Z();
772 }
773 return fitter->GetC();
eb38ed55 774}
775
776//_________________________________________________________________________
777void AliTRDtrackerV1::FitRieman(AliTRDcluster **seedcl, Double_t chi2[2])
778{
41702fec 779 //
780 // Performs a Riemann helix fit using the seedclusters as spacepoints
781 // Afterwards the chi2 values are calculated and the seeds are updated
782 //
783 // Parameters: - The four seedclusters
784 // - The tracklet array (AliTRDseedV1)
785 // - The seeding configuration
786 // - Chi2 array
787 //
788 // debug level 2
789 //
790 AliRieman *fitter = AliTRDtrackerV1::GetRiemanFitter();
791 fitter->Reset();
792 for(Int_t i = 0; i < 4; i++)
793 fitter->AddPoint(seedcl[i]->GetX(), seedcl[i]->GetY(), seedcl[i]->GetZ(), 1, 10);
794 fitter->Update();
795
796
797 // Update the seed and calculated the chi2 value
798 chi2[0] = 0; chi2[1] = 0;
799 for(Int_t ipl = 0; ipl < kNSeedPlanes; ipl++){
800 // chi2
801 chi2[0] += (seedcl[ipl]->GetZ() - fitter->GetZat(seedcl[ipl]->GetX())) * (seedcl[ipl]->GetZ() - fitter->GetZat(seedcl[ipl]->GetX()));
802 chi2[1] += (seedcl[ipl]->GetY() - fitter->GetYat(seedcl[ipl]->GetX())) * (seedcl[ipl]->GetY() - fitter->GetYat(seedcl[ipl]->GetX()));
803 }
eb38ed55 804}
805
806
807//_________________________________________________________________________
808Float_t AliTRDtrackerV1::FitTiltedRiemanConstraint(AliTRDseedV1 *tracklets, Double_t zVertex)
809{
41702fec 810 //
811 // Fits a helix to the clusters. Pad tilting is considered. As constraint it is
812 // assumed that the vertex position is set to 0.
813 // This method is very usefull for high-pt particles
814 // Basis for the fit: (x - x0)^2 + (y - y0)^2 - R^2 = 0
815 // x0, y0: Center of the circle
816 // Measured y-position: ymeas = y - tan(phiT)(zc - zt)
817 // zc: center of the pad row
818 // Equation which has to be fitted (after transformation):
819 // a + b * u + e * v + 2*(ymeas + tan(phiT)(z - zVertex))*t = 0
820 // Transformation:
821 // t = 1/(x^2 + y^2)
822 // u = 2 * x * t
823 // v = 2 * x * tan(phiT) * t
824 // Parameters in the equation:
825 // a = -1/y0, b = x0/y0, e = dz/dx
826 //
827 // The Curvature is calculated by the following equation:
828 // - curv = a/Sqrt(b^2 + 1) = 1/R
829 // Parameters: - the 6 tracklets
830 // - the Vertex constraint
831 // Output: - the Chi2 value of the track
832 //
833 // debug level 5
834 //
835
836 TLinearFitter *fitter = GetTiltedRiemanFitterConstraint();
837 fitter->StoreData(kTRUE);
838 fitter->ClearPoints();
839 AliTRDcluster *cl = 0x0;
840
841 Float_t x, y, z, w, t, error, tilt;
842 Double_t uvt[2];
843 Int_t nPoints = 0;
053767a4 844 for(Int_t ilr = 0; ilr < AliTRDgeometry::kNlayer; ilr++){
845 if(!tracklets[ilr].IsOK()) continue;
41702fec 846 for(Int_t itb = 0; itb < fgNTimeBins; itb++){
053767a4 847 if(!tracklets[ilr].IsUsable(itb)) continue;
848 cl = tracklets[ilr].GetClusters(itb);
41702fec 849 x = cl->GetX();
850 y = cl->GetY();
851 z = cl->GetZ();
053767a4 852 tilt = tracklets[ilr].GetTilt();
41702fec 853 // Transformation
854 t = 1./(x * x + y * y);
855 uvt[0] = 2. * x * t;
856 uvt[1] = 2. * x * t * tilt ;
857 w = 2. * (y + tilt * (z - zVertex)) * t;
858 error = 2. * 0.2 * t;
859 fitter->AddPoint(uvt, w, error);
860 nPoints++;
861 }
862 }
863 fitter->Eval();
864
865 // Calculate curvature
866 Double_t a = fitter->GetParameter(0);
867 Double_t b = fitter->GetParameter(1);
868 Double_t curvature = a/TMath::Sqrt(b*b + 1);
869
870 Float_t chi2track = fitter->GetChisquare()/Double_t(nPoints);
871 for(Int_t ip = 0; ip < AliTRDtrackerV1::kNPlanes; ip++)
872 tracklets[ip].SetCC(curvature);
873
7e88424f 874 if(AliTRDReconstructor::GetRecoParam()->GetStreamLevel() >= 5){
41702fec 875 //Linear Model on z-direction
876 Double_t xref = CalculateReferenceX(tracklets); // Relative to the middle of the stack
877 Double_t slope = fitter->GetParameter(2);
878 Double_t zref = slope * xref;
879 Float_t chi2Z = CalculateChi2Z(tracklets, zref, slope, xref);
880 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
881 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
882 TTreeSRedirector &treeStreamer = *fgDebugStreamer;
883 treeStreamer << "FitTiltedRiemanConstraint"
884 << "EventNumber=" << eventNumber
885 << "CandidateNumber=" << candidateNumber
886 << "Curvature=" << curvature
887 << "Chi2Track=" << chi2track
888 << "Chi2Z=" << chi2Z
889 << "zref=" << zref
890 << "\n";
891 }
892 return chi2track;
eb38ed55 893}
894
895//_________________________________________________________________________
896Float_t AliTRDtrackerV1::FitTiltedRieman(AliTRDseedV1 *tracklets, Bool_t sigError)
897{
41702fec 898 //
899 // Performs a Riemann fit taking tilting pad correction into account
900 // The equation of a Riemann circle, where the y position is substituted by the
901 // measured y-position taking pad tilting into account, has to be transformed
902 // into a 4-dimensional hyperplane equation
903 // Riemann circle: (x-x0)^2 + (y-y0)^2 -R^2 = 0
904 // Measured y-Position: ymeas = y - tan(phiT)(zc - zt)
905 // zc: center of the pad row
906 // zt: z-position of the track
907 // The z-position of the track is assumed to be linear dependent on the x-position
908 // Transformed equation: a + b * u + c * t + d * v + e * w - 2 * (ymeas + tan(phiT) * zc) * t = 0
909 // Transformation: u = 2 * x * t
910 // v = 2 * tan(phiT) * t
911 // w = 2 * tan(phiT) * (x - xref) * t
912 // t = 1 / (x^2 + ymeas^2)
913 // Parameters: a = -1/y0
914 // b = x0/y0
915 // c = (R^2 -x0^2 - y0^2)/y0
916 // d = offset
917 // e = dz/dx
918 // If the offset respectively the slope in z-position is impossible, the parameters are fixed using
919 // results from the simple riemann fit. Afterwards the fit is redone.
920 // The curvature is calculated according to the formula:
921 // curv = a/(1 + b^2 + c*a) = 1/R
922 //
923 // Paramters: - Array of tracklets (connected to the track candidate)
924 // - Flag selecting the error definition
925 // Output: - Chi2 values of the track (in Parameter list)
926 //
927 TLinearFitter *fitter = GetTiltedRiemanFitter();
928 fitter->StoreData(kTRUE);
929 fitter->ClearPoints();
930 AliTRDLeastSquare zfitter;
931 AliTRDcluster *cl = 0x0;
932
933 Double_t xref = CalculateReferenceX(tracklets);
934 Double_t x, y, z, t, tilt, dx, w, we;
935 Double_t uvt[4];
936 Int_t nPoints = 0;
937 // Containers for Least-square fitter
938 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
939 if(!tracklets[ipl].IsOK()) continue;
940 for(Int_t itb = 0; itb < fgNTimeBins; itb++){
941 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
942 if (!tracklets[ipl].IsUsable(itb)) continue;
943 x = cl->GetX();
944 y = cl->GetY();
945 z = cl->GetZ();
946 tilt = tracklets[ipl].GetTilt();
947 dx = x - xref;
948 // Transformation
949 t = 1./(x*x + y*y);
950 uvt[0] = 2. * x * t;
951 uvt[1] = t;
952 uvt[2] = 2. * tilt * t;
953 uvt[3] = 2. * tilt * dx * t;
954 w = 2. * (y + tilt*z) * t;
955 // error definition changes for the different calls
956 we = 2. * t;
957 we *= sigError ? tracklets[ipl].GetSigmaY() : 0.2;
958 fitter->AddPoint(uvt, w, we);
959 zfitter.AddPoint(&x, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
960 nPoints++;
961 }
962 }
963 fitter->Eval();
964 zfitter.Eval();
965
966 Double_t offset = fitter->GetParameter(3);
967 Double_t slope = fitter->GetParameter(4);
968
969 // Linear fitter - not possible to make boundaries
970 // Do not accept non possible z and dzdx combinations
971 Bool_t acceptablez = kTRUE;
972 Double_t zref = 0.0;
973 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
974 if(!tracklets[iLayer].IsOK()) continue;
975 zref = offset + slope * (tracklets[iLayer].GetX0() - xref);
976 if (TMath::Abs(tracklets[iLayer].GetZProb() - zref) > tracklets[iLayer].GetPadLength() * 0.5 + 1.0)
977 acceptablez = kFALSE;
978 }
979 if (!acceptablez) {
980 Double_t dzmf = zfitter.GetFunctionParameter(1);
981 Double_t zmf = zfitter.GetFunctionValue(&xref);
982 fgTiltedRieman->FixParameter(3, zmf);
983 fgTiltedRieman->FixParameter(4, dzmf);
984 fitter->Eval();
985 fitter->ReleaseParameter(3);
986 fitter->ReleaseParameter(4);
987 offset = fitter->GetParameter(3);
988 slope = fitter->GetParameter(4);
989 }
990
991 // Calculate Curvarture
992 Double_t a = fitter->GetParameter(0);
993 Double_t b = fitter->GetParameter(1);
994 Double_t c = fitter->GetParameter(2);
995 Double_t curvature = 1.0 + b*b - c*a;
996 if (curvature > 0.0)
997 curvature = a / TMath::Sqrt(curvature);
998
999 Double_t chi2track = fitter->GetChisquare()/Double_t(nPoints);
1000
1001 // Update the tracklets
1002 Double_t dy, dz;
1003 for(Int_t iLayer = 0; iLayer < AliTRDtrackerV1::kNPlanes; iLayer++) {
1004
1005 x = tracklets[iLayer].GetX0();
1006 y = 0;
1007 z = 0;
1008 dy = 0;
1009 dz = 0;
1010
1011 // y: R^2 = (x - x0)^2 + (y - y0)^2
1012 // => y = y0 +/- Sqrt(R^2 - (x - x0)^2)
1013 // R = Sqrt() = 1/Curvature
1014 // => y = y0 +/- Sqrt(1/Curvature^2 - (x - x0)^2)
1015 Double_t res = (x * a + b); // = (x - x0)/y0
1016 res *= res;
1017 res = 1.0 - c * a + b * b - res; // = (R^2 - (x - x0)^2)/y0^2
1018 if (res >= 0) {
1019 res = TMath::Sqrt(res);
1020 y = (1.0 - res) / a;
1021 }
1022
1023 // dy: R^2 = (x - x0)^2 + (y - y0)^2
1024 // => y = +/- Sqrt(R^2 - (x - x0)^2) + y0
1025 // => dy/dx = (x - x0)/Sqrt(R^2 - (x - x0)^2)
1026 // Curvature: cr = 1/R = a/Sqrt(1 + b^2 - c*a)
1027 // => dy/dx = (x - x0)/(1/(cr^2) - (x - x0)^2)
1028 Double_t x0 = -b / a;
1029 if (-c * a + b * b + 1 > 0) {
1030 if (1.0/(curvature * curvature) - (x - x0) * (x - x0) > 0.0) {
1031 Double_t yderiv = (x - x0) / TMath::Sqrt(1.0/(curvature * curvature) - (x - x0) * (x - x0));
1032 if (a < 0) yderiv *= -1.0;
1033 dy = yderiv;
1034 }
1035 }
1036 z = offset + slope * (x - xref);
1037 dz = slope;
1038 tracklets[iLayer].SetYref(0, y);
1039 tracklets[iLayer].SetYref(1, dy);
1040 tracklets[iLayer].SetZref(0, z);
1041 tracklets[iLayer].SetZref(1, dz);
1042 tracklets[iLayer].SetC(curvature);
1043 tracklets[iLayer].SetChi2(chi2track);
1044 }
1045
7e88424f 1046 if(AliTRDReconstructor::GetRecoParam()->GetStreamLevel() >=5){
41702fec 1047 TTreeSRedirector &cstreamer = *fgDebugStreamer;
1048 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
1049 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
1050 Double_t chi2z = CalculateChi2Z(tracklets, offset, slope, xref);
1051 cstreamer << "FitTiltedRieman0"
1052 << "EventNumber=" << eventNumber
1053 << "CandidateNumber=" << candidateNumber
1054 << "xref=" << xref
1055 << "Chi2Z=" << chi2z
1056 << "\n";
1057 }
1058 return chi2track;
eb38ed55 1059}
1060
3b57a3f7 1061
9e333711 1062//____________________________________________________________________
1063Double_t AliTRDtrackerV1::FitLine(AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t err, Int_t np, AliTrackPoint *points)
1064{
1065 AliTRDLeastSquare yfitter, zfitter;
1066 AliTRDcluster *cl = 0x0;
1067
1068 AliTRDseedV1 work[kNPlanes], *tracklet = 0x0;
1069 if(!tracklets){
1070 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1071 if(!(tracklet = track->GetTracklet(ipl))) continue;
1072 if(!tracklet->IsOK()) continue;
1073 new(&work[ipl]) AliTRDseedV1(*tracklet);
1074 }
1075 tracklets = &work[0];
1076 }
1077
1078 Double_t xref = CalculateReferenceX(tracklets);
1079 Double_t x, y, z, dx, ye, yr, tilt;
1080 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1081 if(!tracklets[ipl].IsOK()) continue;
1082 for(Int_t itb = 0; itb < fgNTimeBins; itb++){
1083 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1084 if (!tracklets[ipl].IsUsable(itb)) continue;
1085 x = cl->GetX();
1086 z = cl->GetZ();
1087 dx = x - xref;
1088 zfitter.AddPoint(&dx, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
1089 }
1090 }
1091 zfitter.Eval();
1092 Double_t z0 = zfitter.GetFunctionParameter(0);
1093 Double_t dzdx = zfitter.GetFunctionParameter(1);
1094 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1095 if(!tracklets[ipl].IsOK()) continue;
1096 for(Int_t itb = 0; itb < fgNTimeBins; itb++){
1097 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1098 if (!tracklets[ipl].IsUsable(itb)) continue;
1099 x = cl->GetX();
1100 y = cl->GetY();
1101 z = cl->GetZ();
1102 tilt = tracklets[ipl].GetTilt();
1103 dx = x - xref;
1104 yr = y + tilt*(z - z0 - dzdx*dx);
1105 // error definition changes for the different calls
1106 ye = tilt*TMath::Sqrt(cl->GetSigmaZ2());
1107 ye += err ? tracklets[ipl].GetSigmaY() : 0.2;
1108 yfitter.AddPoint(&dx, yr, ye);
1109 }
1110 }
1111 yfitter.Eval();
1112 Double_t y0 = yfitter.GetFunctionParameter(0);
1113 Double_t dydx = yfitter.GetFunctionParameter(1);
1114 Double_t chi2 = 0.;//yfitter.GetChisquare()/Double_t(nPoints);
1115
1116 //update track points array
1117 if(np && points){
1118 Float_t xyz[3];
1119 for(int ip=0; ip<np; ip++){
1120 points[ip].GetXYZ(xyz);
1121 xyz[1] = y0 + dydx * (xyz[0] - xref);
1122 xyz[2] = z0 + dzdx * (xyz[0] - xref);
1123 points[ip].SetXYZ(xyz);
1124 }
1125 }
1126 return chi2;
1127}
1128
1129
3b57a3f7 1130//_________________________________________________________________________
1131Double_t AliTRDtrackerV1::FitRiemanTilt(AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t sigError, Int_t np, AliTrackPoint *points)
1132{
41702fec 1133 //
1134 // Performs a Riemann fit taking tilting pad correction into account
1135 // The equation of a Riemann circle, where the y position is substituted by the
1136 // measured y-position taking pad tilting into account, has to be transformed
1137 // into a 4-dimensional hyperplane equation
1138 // Riemann circle: (x-x0)^2 + (y-y0)^2 -R^2 = 0
1139 // Measured y-Position: ymeas = y - tan(phiT)(zc - zt)
1140 // zc: center of the pad row
1141 // zt: z-position of the track
1142 // The z-position of the track is assumed to be linear dependent on the x-position
1143 // Transformed equation: a + b * u + c * t + d * v + e * w - 2 * (ymeas + tan(phiT) * zc) * t = 0
1144 // Transformation: u = 2 * x * t
1145 // v = 2 * tan(phiT) * t
1146 // w = 2 * tan(phiT) * (x - xref) * t
1147 // t = 1 / (x^2 + ymeas^2)
1148 // Parameters: a = -1/y0
1149 // b = x0/y0
1150 // c = (R^2 -x0^2 - y0^2)/y0
1151 // d = offset
1152 // e = dz/dx
1153 // If the offset respectively the slope in z-position is impossible, the parameters are fixed using
1154 // results from the simple riemann fit. Afterwards the fit is redone.
1155 // The curvature is calculated according to the formula:
1156 // curv = a/(1 + b^2 + c*a) = 1/R
1157 //
1158 // Paramters: - Array of tracklets (connected to the track candidate)
1159 // - Flag selecting the error definition
1160 // Output: - Chi2 values of the track (in Parameter list)
1161 //
1162 TLinearFitter *fitter = GetTiltedRiemanFitter();
1163 fitter->StoreData(kTRUE);
1164 fitter->ClearPoints();
1165 AliTRDLeastSquare zfitter;
1166 AliTRDcluster *cl = 0x0;
3b57a3f7 1167
1168 AliTRDseedV1 work[kNPlanes], *tracklet = 0x0;
1169 if(!tracklets){
1170 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1171 if(!(tracklet = track->GetTracklet(ipl))) continue;
1172 if(!tracklet->IsOK()) continue;
1173 new(&work[ipl]) AliTRDseedV1(*tracklet);
1174 }
1175 tracklets = &work[0];
1176 }
1177
41702fec 1178 Double_t xref = CalculateReferenceX(tracklets);
1179 Double_t x, y, z, t, tilt, dx, w, we;
1180 Double_t uvt[4];
1181 Int_t nPoints = 0;
1182 // Containers for Least-square fitter
1183 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1184 if(!tracklets[ipl].IsOK()) continue;
1185 for(Int_t itb = 0; itb < fgNTimeBins; itb++){
1186 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1187 if (!tracklets[ipl].IsUsable(itb)) continue;
1188 x = cl->GetX();
1189 y = cl->GetY();
1190 z = cl->GetZ();
1191 tilt = tracklets[ipl].GetTilt();
1192 dx = x - xref;
1193 // Transformation
1194 t = 1./(x*x + y*y);
1195 uvt[0] = 2. * x * t;
1196 uvt[1] = t;
1197 uvt[2] = 2. * tilt * t;
1198 uvt[3] = 2. * tilt * dx * t;
1199 w = 2. * (y + tilt*z) * t;
1200 // error definition changes for the different calls
1201 we = 2. * t;
1202 we *= sigError ? tracklets[ipl].GetSigmaY() : 0.2;
1203 fitter->AddPoint(uvt, w, we);
1204 zfitter.AddPoint(&x, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
1205 nPoints++;
1206 }
1207 }
1208 fitter->Eval();
1209 Double_t z0 = fitter->GetParameter(3);
1210 Double_t dzdx = fitter->GetParameter(4);
3b57a3f7 1211
1212
1213 // Linear fitter - not possible to make boundaries
1214 // Do not accept non possible z and dzdx combinations
1215 Bool_t accept = kTRUE;
1216 Double_t zref = 0.0;
1217 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
1218 if(!tracklets[iLayer].IsOK()) continue;
1219 zref = z0 + dzdx * (tracklets[iLayer].GetX0() - xref);
1220 if (TMath::Abs(tracklets[iLayer].GetZProb() - zref) > tracklets[iLayer].GetPadLength() * 0.5 + 1.0)
1221 accept = kFALSE;
1222 }
1223 if (!accept) {
41702fec 1224 zfitter.Eval();
3b57a3f7 1225 Double_t dzmf = zfitter.GetFunctionParameter(1);
1226 Double_t zmf = zfitter.GetFunctionValue(&xref);
1227 fitter->FixParameter(3, zmf);
1228 fitter->FixParameter(4, dzmf);
1229 fitter->Eval();
1230 fitter->ReleaseParameter(3);
1231 fitter->ReleaseParameter(4);
1232 z0 = fitter->GetParameter(3); // = zmf ?
1233 dzdx = fitter->GetParameter(4); // = dzmf ?
1234 }
1235
1236 // Calculate Curvature
1237 Double_t a = fitter->GetParameter(0);
1238 Double_t b = fitter->GetParameter(1);
1239 Double_t c = fitter->GetParameter(2);
1240 Double_t y0 = 1. / a;
1241 Double_t x0 = -b * y0;
1242 Double_t R = TMath::Sqrt(y0*y0 + x0*x0 - c*y0);
1243 Double_t C = 1.0 + b*b - c*a;
1244 if (C > 0.0) C = a / TMath::Sqrt(C);
1245
1246 // Calculate chi2 of the fit
1247 Double_t chi2 = fitter->GetChisquare()/Double_t(nPoints);
1248
1249 // Update the tracklets
1250 if(!track){
1251 for(Int_t ip = 0; ip < kNPlanes; ip++) {
1252 x = tracklets[ip].GetX0();
1253 Double_t tmp = TMath::Sqrt(R*R-(x-x0)*(x-x0));
1254
1255 // y: R^2 = (x - x0)^2 + (y - y0)^2
1256 // => y = y0 +/- Sqrt(R^2 - (x - x0)^2)
1257 tracklets[ip].SetYref(0, y0 - (y0>0.?1.:-1)*tmp);
1258 // => dy/dx = (x - x0)/Sqrt(R^2 - (x - x0)^2)
1259 tracklets[ip].SetYref(1, (x - x0) / tmp);
1260 tracklets[ip].SetZref(0, z0 + dzdx * (x - xref));
1261 tracklets[ip].SetZref(1, dzdx);
1262 tracklets[ip].SetC(C);
1263 tracklets[ip].SetChi2(chi2);
1264 }
1265 }
1266
1267 //update track points array
1268 if(np && points){
1269 Float_t xyz[3];
1270 for(int ip=0; ip<np; ip++){
1271 points[ip].GetXYZ(xyz);
1272 xyz[1] = y0 - (y0>0.?1.:-1)*TMath::Sqrt(R*R-(xyz[0]-x0)*(xyz[0]-x0));
1273 xyz[2] = z0 + dzdx * (xyz[0] - xref);
1274 points[ip].SetXYZ(xyz);
1275 }
1276 }
1277
7e88424f 1278 if(AliTRDReconstructor::GetRecoParam()->GetStreamLevel() >=5){
3b57a3f7 1279 TTreeSRedirector &cstreamer = *fgDebugStreamer;
1280 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
1281 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
1282 Double_t chi2z = CalculateChi2Z(tracklets, z0, dzdx, xref);
1283 cstreamer << "FitRiemanTilt"
1284 << "EventNumber=" << eventNumber
1285 << "CandidateNumber=" << candidateNumber
1286 << "xref=" << xref
1287 << "Chi2Z=" << chi2z
1288 << "\n";
1289 }
1290 return chi2;
1291}
1292
1293
1294
eb38ed55 1295//_________________________________________________________________________
bb56afff 1296Float_t AliTRDtrackerV1::CalculateChi2Z(AliTRDseedV1 *tracklets, Double_t offset, Double_t slope, Double_t xref)
eb38ed55 1297{
41702fec 1298 //
1299 // Calculates the chi2-value of the track in z-Direction including tilting pad correction.
1300 // A linear dependence on the x-value serves as a model.
1301 // The parameters are related to the tilted Riemann fit.
1302 // Parameters: - Array of tracklets (AliTRDseedV1) related to the track candidate
1303 // - the offset for the reference x
1304 // - the slope
1305 // - the reference x position
1306 // Output: - The Chi2 value of the track in z-Direction
1307 //
1308 Float_t chi2Z = 0, nLayers = 0;
053767a4 1309 for (Int_t iLayer = 0; iLayer < AliTRDgeometry::kNlayer; iLayer++) {
41702fec 1310 if(!tracklets[iLayer].IsOK()) continue;
1311 Double_t z = offset + slope * (tracklets[iLayer].GetX0() - xref);
1312 chi2Z += TMath::Abs(tracklets[iLayer].GetMeanz() - z);
1313 nLayers++;
1314 }
1315 chi2Z /= TMath::Max((nLayers - 3.0),1.0);
1316 return chi2Z;
eb38ed55 1317}
1318
bccda319 1319//_____________________________________________________________________________
1320Int_t AliTRDtrackerV1::PropagateToX(AliTRDtrackV1 &t, Double_t xToGo, Double_t maxStep)
1321{
41702fec 1322 //
1323 // Starting from current X-position of track <t> this function
1324 // extrapolates the track up to radial position <xToGo>.
1325 // Returns 1 if track reaches the plane, and 0 otherwise
1326 //
bccda319 1327
41702fec 1328 const Double_t kEpsilon = 0.00001;
bccda319 1329
41702fec 1330 // Current track X-position
1331 Double_t xpos = t.GetX();
bccda319 1332
41702fec 1333 // Direction: inward or outward
1334 Double_t dir = (xpos < xToGo) ? 1.0 : -1.0;
bccda319 1335
41702fec 1336 while (((xToGo - xpos) * dir) > kEpsilon) {
bccda319 1337
41702fec 1338 Double_t xyz0[3];
1339 Double_t xyz1[3];
1340 Double_t param[7];
1341 Double_t x;
1342 Double_t y;
1343 Double_t z;
bccda319 1344
41702fec 1345 // The next step size
1346 Double_t step = dir * TMath::Min(TMath::Abs(xToGo-xpos),maxStep);
bccda319 1347
41702fec 1348 // Get the global position of the starting point
1349 t.GetXYZ(xyz0);
bccda319 1350
41702fec 1351 // X-position after next step
1352 x = xpos + step;
bccda319 1353
41702fec 1354 // Get local Y and Z at the X-position of the next step
1355 if (!t.GetProlongation(x,y,z)) {
1356 return 0; // No prolongation possible
1357 }
bccda319 1358
41702fec 1359 // The global position of the end point of this prolongation step
1360 xyz1[0] = x * TMath::Cos(t.GetAlpha()) - y * TMath::Sin(t.GetAlpha());
1361 xyz1[1] = +x * TMath::Sin(t.GetAlpha()) + y * TMath::Cos(t.GetAlpha());
1362 xyz1[2] = z;
bccda319 1363
41702fec 1364 // Calculate the mean material budget between start and
1365 // end point of this prolongation step
1366 AliTracker::MeanMaterialBudget(xyz0, xyz1, param);
bccda319 1367
41702fec 1368 // Propagate the track to the X-position after the next step
1369 if (!t.PropagateTo(x,param[1],param[0]*param[4])) {
1370 return 0;
1371 }
bccda319 1372
41702fec 1373 // Rotate the track if necessary
1374 AdjustSector(&t);
bccda319 1375
41702fec 1376 // New track X-position
1377 xpos = t.GetX();
bccda319 1378
41702fec 1379 }
bccda319 1380
41702fec 1381 return 1;
bccda319 1382
1383}
1384
eb38ed55 1385
1386//_____________________________________________________________________________
1387Int_t AliTRDtrackerV1::ReadClusters(TClonesArray* &array, TTree *clusterTree) const
1388{
41702fec 1389 //
1390 // Reads AliTRDclusters from the file.
1391 // The names of the cluster tree and branches
1392 // should match the ones used in AliTRDclusterizer::WriteClusters()
1393 //
1394
1395 Int_t nsize = Int_t(clusterTree->GetTotBytes() / (sizeof(AliTRDcluster)));
1396 TObjArray *clusterArray = new TObjArray(nsize+1000);
1397
1398 TBranch *branch = clusterTree->GetBranch("TRDcluster");
1399 if (!branch) {
1400 AliError("Can't get the branch !");
1401 return 1;
1402 }
1403 branch->SetAddress(&clusterArray);
1404
1405 if(!fClusters){
1406 array = new TClonesArray("AliTRDcluster", nsize);
1407 array->SetOwner(kTRUE);
1408 }
1409
1410 // Loop through all entries in the tree
1411 Int_t nEntries = (Int_t) clusterTree->GetEntries();
1412 Int_t nbytes = 0;
1413 Int_t ncl = 0;
1414 AliTRDcluster *c = 0x0;
1415 for (Int_t iEntry = 0; iEntry < nEntries; iEntry++) {
1416 // Import the tree
1417 nbytes += clusterTree->GetEvent(iEntry);
1418
1419 // Get the number of points in the detector
1420 Int_t nCluster = clusterArray->GetEntriesFast();
1421 for (Int_t iCluster = 0; iCluster < nCluster; iCluster++) {
1422 if(!(c = (AliTRDcluster *) clusterArray->UncheckedAt(iCluster))) continue;
1423 c->SetInChamber();
1424 new((*fClusters)[ncl++]) AliTRDcluster(*c);
1425 delete (clusterArray->RemoveAt(iCluster));
1426 }
1427
1428 }
1429 delete clusterArray;
1430
1431 return 0;
eb38ed55 1432}
1433
1434//_____________________________________________________________________________
1435Int_t AliTRDtrackerV1::LoadClusters(TTree *cTree)
1436{
41702fec 1437 //
1438 // Fills clusters into TRD tracking_sectors
1439 // Note that the numbering scheme for the TRD tracking_sectors
1440 // differs from that of TRD sectors
1441 //
1442
1443
1444 if (ReadClusters(fClusters, cTree)) {
1445 AliError("Problem with reading the clusters !");
1446 return 1;
1447 }
1448 Int_t ncl = fClusters->GetEntriesFast(), nin = 0;
1449 if(!ncl){
1450 AliInfo("Clusters 0");
1451 return 1;
1452 }
1453
1454 Int_t icl = ncl;
1455 while (icl--) {
1456 AliTRDcluster *c = (AliTRDcluster *) fClusters->UncheckedAt(icl);
1457 if(c->IsInChamber()) nin++;
1458 Int_t detector = c->GetDetector();
1459 Int_t sector = fGeom->GetSector(detector);
053767a4 1460 Int_t stack = fGeom->GetStack(detector);
1461 Int_t layer = fGeom->GetLayer(detector);
41702fec 1462
053767a4 1463 fTrSec[sector].GetChamber(stack, layer, kTRUE)->InsertCluster(c, icl);
41702fec 1464 }
1465 AliInfo(Form("Clusters %d in %6.2f %%", ncl, 100.*float(nin)/ncl));
1466
053767a4 1467 for(int isector =0; isector<AliTRDgeometry::kNsector; isector++){
41702fec 1468 if(!fTrSec[isector].GetNChambers()) continue;
1469 fTrSec[isector].Init();
1470 }
1471
1472 return 0;
eb38ed55 1473}
1474
1475
0906e73e 1476//____________________________________________________________________
1477void AliTRDtrackerV1::UnloadClusters()
1478{
41702fec 1479 //
1480 // Clears the arrays of clusters and tracks. Resets sectors and timebins
1481 //
0906e73e 1482
41702fec 1483 if(fTracks) fTracks->Delete();
1484 if(fTracklets) fTracklets->Delete();
1485 if(fClusters) fClusters->Delete();
0906e73e 1486
053767a4 1487 for (int i = 0; i < AliTRDgeometry::kNsector; i++) fTrSec[i].Clear();
0906e73e 1488
41702fec 1489 // Increment the Event Number
1490 AliTRDtrackerDebug::SetEventNumber(AliTRDtrackerDebug::GetEventNumber() + 1);
eb38ed55 1491}
0906e73e 1492
eb38ed55 1493//_____________________________________________________________________________
1494Bool_t AliTRDtrackerV1::AdjustSector(AliTRDtrackV1 *track)
1495{
41702fec 1496 //
1497 // Rotates the track when necessary
1498 //
1499
1500 Double_t alpha = AliTRDgeometry::GetAlpha();
1501 Double_t y = track->GetY();
1502 Double_t ymax = track->GetX()*TMath::Tan(0.5*alpha);
1503
1504 if (y > ymax) {
1505 if (!track->Rotate( alpha)) {
1506 return kFALSE;
1507 }
1508 }
1509 else if (y < -ymax) {
1510 if (!track->Rotate(-alpha)) {
1511 return kFALSE;
1512 }
1513 }
1514
1515 return kTRUE;
0906e73e 1516
1517}
1518
eb38ed55 1519
0906e73e 1520//____________________________________________________________________
1521AliTRDseedV1* AliTRDtrackerV1::GetTracklet(AliTRDtrackV1 *track, Int_t p, Int_t &idx)
1522{
41702fec 1523 // Find tracklet for TRD track <track>
1524 // Parameters
1525 // - track
1526 // - sector
1527 // - plane
1528 // - index
1529 // Output
1530 // tracklet
1531 // index
1532 // Detailed description
1533 //
1534 idx = track->GetTrackletIndex(p);
1535 AliTRDseedV1 *tracklet = (idx==0xffff) ? 0x0 : (AliTRDseedV1*)fTracklets->UncheckedAt(idx);
1536
1537 return tracklet;
0906e73e 1538}
1539
1540//____________________________________________________________________
3b57a3f7 1541AliTRDseedV1* AliTRDtrackerV1::SetTracklet(AliTRDseedV1 *tracklet)
0906e73e 1542{
41702fec 1543 // Add this tracklet to the list of tracklets stored in the tracker
1544 //
1545 // Parameters
1546 // - tracklet : pointer to the tracklet to be added to the list
1547 //
1548 // Output
1549 // - the index of the new tracklet in the tracker tracklets list
1550 //
1551 // Detailed description
1552 // Build the tracklets list if it is not yet created (late initialization)
1553 // and adds the new tracklet to the list.
1554 //
1555 if(!fTracklets){
053767a4 1556 fTracklets = new TClonesArray("AliTRDseedV1", AliTRDgeometry::Nsector()*kMaxTracksStack);
41702fec 1557 fTracklets->SetOwner(kTRUE);
1558 }
1559 Int_t nentries = fTracklets->GetEntriesFast();
1560 return new ((*fTracklets)[nentries]) AliTRDseedV1(*tracklet);
972ef65e 1561}
1562
d20df6fc 1563//____________________________________________________________________
1564AliTRDtrackV1* AliTRDtrackerV1::SetTrack(AliTRDtrackV1 *track)
1565{
1566 // Add this track to the list of tracks stored in the tracker
1567 //
1568 // Parameters
1569 // - track : pointer to the track to be added to the list
1570 //
1571 // Output
1572 // - the pointer added
1573 //
1574 // Detailed description
1575 // Build the tracks list if it is not yet created (late initialization)
1576 // and adds the new track to the list.
1577 //
1578 if(!fTracks){
053767a4 1579 fTracks = new TClonesArray("AliTRDtrackV1", AliTRDgeometry::Nsector()*kMaxTracksStack);
d20df6fc 1580 fTracks->SetOwner(kTRUE);
1581 }
1582 Int_t nentries = fTracks->GetEntriesFast();
1583 return new ((*fTracks)[nentries]) AliTRDtrackV1(*track);
1584}
1585
1586
0906e73e 1587
e4f2f73d 1588//____________________________________________________________________
eb38ed55 1589Int_t AliTRDtrackerV1::Clusters2TracksSM(Int_t sector, AliESDEvent *esd)
e4f2f73d 1590{
41702fec 1591 //
1592 // Steer tracking for one SM.
1593 //
1594 // Parameters :
1595 // sector : Array of (SM) propagation layers containing clusters
1596 // esd : The current ESD event. On output it contains the also
1597 // the ESD (TRD) tracks found in this SM.
1598 //
1599 // Output :
1600 // Number of tracks found in this TRD supermodule.
1601 //
1602 // Detailed description
1603 //
1604 // 1. Unpack AliTRDpropagationLayers objects for each stack.
1605 // 2. Launch stack tracking.
1606 // See AliTRDtrackerV1::Clusters2TracksStack() for details.
1607 // 3. Pack results in the ESD event.
1608 //
1609
1610 // allocate space for esd tracks in this SM
1611 TClonesArray esdTrackList("AliESDtrack", 2*kMaxTracksStack);
1612 esdTrackList.SetOwner();
1613
1614 Int_t nTracks = 0;
1615 Int_t nChambers = 0;
1616 AliTRDtrackingChamber **stack = 0x0, *chamber = 0x0;
053767a4 1617 for(int istack = 0; istack<AliTRDgeometry::kNstack; istack++){
41702fec 1618 if(!(stack = fTrSec[sector].GetStack(istack))) continue;
1619 nChambers = 0;
053767a4 1620 for(int ilayer=0; ilayer<AliTRDgeometry::kNlayer; ilayer++){
1621 if(!(chamber = stack[ilayer])) continue;
7e88424f 1622 if(chamber->GetNClusters() < fgNTimeBins * AliTRDReconstructor::GetRecoParam()->GetFindableClusters()) continue;
41702fec 1623 nChambers++;
053767a4 1624 //AliInfo(Form("sector %d stack %d layer %d clusters %d", sector, istack, ilayer, chamber->GetNClusters()));
41702fec 1625 }
1626 if(nChambers < 4) continue;
1627 //AliInfo(Form("Doing stack %d", istack));
1628 nTracks += Clusters2TracksStack(stack, &esdTrackList);
1629 }
1630 //AliInfo(Form("Found %d tracks in SM %d [%d]\n", nTracks, sector, esd->GetNumberOfTracks()));
1631
1632 for(int itrack=0; itrack<nTracks; itrack++)
1633 esd->AddTrack((AliESDtrack*)esdTrackList[itrack]);
1634
1635 // Reset Track and Candidate Number
1636 AliTRDtrackerDebug::SetCandidateNumber(0);
1637 AliTRDtrackerDebug::SetTrackNumber(0);
1638 return nTracks;
e4f2f73d 1639}
1640
1641//____________________________________________________________________
eb38ed55 1642Int_t AliTRDtrackerV1::Clusters2TracksStack(AliTRDtrackingChamber **stack, TClonesArray *esdTrackList)
e4f2f73d 1643{
41702fec 1644 //
1645 // Make tracks in one TRD stack.
1646 //
1647 // Parameters :
1648 // layer : Array of stack propagation layers containing clusters
1649 // esdTrackList : Array of ESD tracks found by the stand alone tracker.
1650 // On exit the tracks found in this stack are appended.
1651 //
1652 // Output :
1653 // Number of tracks found in this stack.
1654 //
1655 // Detailed description
1656 //
1657 // 1. Find the 3 most useful seeding chambers. See BuildSeedingConfigs() for details.
1658 // 2. Steer AliTRDtrackerV1::MakeSeeds() for 3 seeding layer configurations.
1659 // See AliTRDtrackerV1::MakeSeeds() for more details.
1660 // 3. Arrange track candidates in decreasing order of their quality
1661 // 4. Classify tracks in 5 categories according to:
1662 // a) number of layers crossed
1663 // b) track quality
1664 // 5. Sign clusters by tracks in decreasing order of track quality
1665 // 6. Build AliTRDtrack out of seeding tracklets
1666 // 7. Cook MC label
1667 // 8. Build ESD track and register it to the output list
1668 //
1669
1670 AliTRDtrackingChamber *chamber = 0x0;
1671 AliTRDseedV1 sseed[kMaxTracksStack*6]; // to be initialized
1672 Int_t pars[4]; // MakeSeeds parameters
1673
1674 //Double_t alpha = AliTRDgeometry::GetAlpha();
1675 //Double_t shift = .5 * alpha;
1676 Int_t configs[kNConfigs];
1677
1678 // Build initial seeding configurations
1679 Double_t quality = BuildSeedingConfigs(stack, configs);
7e88424f 1680 if(AliTRDReconstructor::GetRecoParam()->GetStreamLevel() > 1){
41702fec 1681 AliInfo(Form("Plane config %d %d %d Quality %f"
1682 , configs[0], configs[1], configs[2], quality));
1683 }
1684
1685 // Initialize contors
1686 Int_t ntracks, // number of TRD track candidates
1687 ntracks1, // number of registered TRD tracks/iter
1688 ntracks2 = 0; // number of all registered TRD tracks in stack
1689 fSieveSeeding = 0;
1690 do{
1691 // Loop over seeding configurations
1692 ntracks = 0; ntracks1 = 0;
1693 for (Int_t iconf = 0; iconf<3; iconf++) {
1694 pars[0] = configs[iconf];
1695 pars[1] = ntracks;
1696 ntracks = MakeSeeds(stack, &sseed[6*ntracks], pars);
1697 if(ntracks == kMaxTracksStack) break;
1698 }
7e88424f 1699 if(AliTRDReconstructor::GetRecoParam()->GetStreamLevel() > 1) AliInfo(Form("Candidate TRD tracks %d in iteration %d.", ntracks, fSieveSeeding));
41702fec 1700
1701 if(!ntracks) break;
1702
1703 // Sort the seeds according to their quality
1704 Int_t sort[kMaxTracksStack];
1705 TMath::Sort(ntracks, fTrackQuality, sort, kTRUE);
1706
1707 // Initialize number of tracks so far and logic switches
1708 Int_t ntracks0 = esdTrackList->GetEntriesFast();
1709 Bool_t signedTrack[kMaxTracksStack];
1710 Bool_t fakeTrack[kMaxTracksStack];
1711 for (Int_t i=0; i<ntracks; i++){
1712 signedTrack[i] = kFALSE;
1713 fakeTrack[i] = kFALSE;
1714 }
1715 //AliInfo("Selecting track candidates ...");
1716
1717 // Sieve clusters in decreasing order of track quality
1718 Double_t trackParams[7];
1719 // AliTRDseedV1 *lseed = 0x0;
1720 Int_t jSieve = 0, candidates;
1721 do{
1722 //AliInfo(Form("\t\tITER = %i ", jSieve));
1723
1724 // Check track candidates
1725 candidates = 0;
1726 for (Int_t itrack = 0; itrack < ntracks; itrack++) {
1727 Int_t trackIndex = sort[itrack];
1728 if (signedTrack[trackIndex] || fakeTrack[trackIndex]) continue;
1729
1730
1731 // Calculate track parameters from tracklets seeds
1732 Int_t labelsall[1000];
1733 Int_t nlabelsall = 0;
1734 Int_t naccepted = 0;
1735 Int_t ncl = 0;
1736 Int_t nused = 0;
1737 Int_t nlayers = 0;
1738 Int_t findable = 0;
1739 for (Int_t jLayer = 0; jLayer < kNPlanes; jLayer++) {
1740 Int_t jseed = kNPlanes*trackIndex+jLayer;
1741 if(!sseed[jseed].IsOK()) continue;
1742 if (TMath::Abs(sseed[jseed].GetYref(0) / sseed[jseed].GetX0()) < 0.15) findable++;
1743
1744 sseed[jseed].UpdateUsed();
1745 ncl += sseed[jseed].GetN2();
1746 nused += sseed[jseed].GetNUsed();
1747 nlayers++;
1748
1749 // Cooking label
1750 for (Int_t itime = 0; itime < fgNTimeBins; itime++) {
1751 if(!sseed[jseed].IsUsable(itime)) continue;
1752 naccepted++;
1753 Int_t tindex = 0, ilab = 0;
1754 while(ilab<3 && (tindex = sseed[jseed].GetClusters(itime)->GetLabel(ilab)) >= 0){
1755 labelsall[nlabelsall++] = tindex;
1756 ilab++;
1757 }
1758 }
1759 }
1760 // Filter duplicated tracks
1761 if (nused > 30){
1762 //printf("Skip %d nused %d\n", trackIndex, nused);
1763 fakeTrack[trackIndex] = kTRUE;
1764 continue;
1765 }
1766 if (Float_t(nused)/ncl >= .25){
1767 //printf("Skip %d nused/ncl >= .25\n", trackIndex);
1768 fakeTrack[trackIndex] = kTRUE;
1769 continue;
1770 }
1771
1772 // Classify tracks
1773 Bool_t skip = kFALSE;
1774 switch(jSieve){
1775 case 0:
1776 if(nlayers < 6) {skip = kTRUE; break;}
1777 if(TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -5.){skip = kTRUE; break;}
1778 break;
1779
1780 case 1:
1781 if(nlayers < findable){skip = kTRUE; break;}
1782 if(TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -4.){skip = kTRUE; break;}
1783 break;
1784
1785 case 2:
1786 if ((nlayers == findable) || (nlayers == 6)) { skip = kTRUE; break;}
1787 if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -6.0){skip = kTRUE; break;}
1788 break;
1789
1790 case 3:
1791 if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -5.){skip = kTRUE; break;}
1792 break;
1793
1794 case 4:
1795 if (nlayers == 3){skip = kTRUE; break;}
1796 //if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) - nused/(nlayers-3.0) < -15.0){skip = kTRUE; break;}
1797 break;
1798 }
1799 if(skip){
1800 candidates++;
1801 //printf("REJECTED : %d [%d] nlayers %d trackQuality = %e nused %d\n", itrack, trackIndex, nlayers, fTrackQuality[trackIndex], nused);
1802 continue;
1803 }
1804 signedTrack[trackIndex] = kTRUE;
1805
1806
1807 // Build track label - what happens if measured data ???
1808 Int_t labels[1000];
1809 Int_t outlab[1000];
1810 Int_t nlab = 0;
1811 for (Int_t iLayer = 0; iLayer < 6; iLayer++) {
1812 Int_t jseed = kNPlanes*trackIndex+iLayer;
1813 if(!sseed[jseed].IsOK()) continue;
1814 for(int ilab=0; ilab<2; ilab++){
1815 if(sseed[jseed].GetLabels(ilab) < 0) continue;
1816 labels[nlab] = sseed[jseed].GetLabels(ilab);
1817 nlab++;
1818 }
1819 }
1820 Freq(nlab,labels,outlab,kFALSE);
1821 Int_t label = outlab[0];
1822 Int_t frequency = outlab[1];
1823 Freq(nlabelsall,labelsall,outlab,kFALSE);
1824 Int_t label1 = outlab[0];
1825 Int_t label2 = outlab[2];
1826 Float_t fakeratio = (naccepted - outlab[1]) / Float_t(naccepted);
1827
1828
1829 // Sign clusters
1830 AliTRDcluster *cl = 0x0; Int_t clusterIndex = -1;
1831 for (Int_t jLayer = 0; jLayer < 6; jLayer++) {
1832 Int_t jseed = kNPlanes*trackIndex+jLayer;
1833 if(!sseed[jseed].IsOK()) continue;
1834 if(TMath::Abs(sseed[jseed].GetYfit(1) - sseed[jseed].GetYfit(1)) >= .2) continue; // check this condition with Marian
1835 sseed[jseed].UseClusters();
1836 if(!cl){
1837 Int_t ic = 0;
1838 while(!(cl = sseed[jseed].GetClusters(ic))) ic++;
1839 clusterIndex = sseed[jseed].GetIndexes(ic);
1840 }
1841 }
1842 if(!cl) continue;
1843
1844
1845 // Build track parameters
1846 AliTRDseedV1 *lseed =&sseed[trackIndex*6];
1847 Int_t idx = 0;
1848 while(idx<3 && !lseed->IsOK()) {
1849 idx++;
1850 lseed++;
1851 }
1852 Double_t cR = lseed->GetC();
1853 Double_t x = lseed->GetX0() - 3.5;
1854 trackParams[0] = x; //NEW AB
1855 trackParams[1] = lseed->GetYat(x);//lseed->GetYref(0);
1856 trackParams[2] = lseed->GetZat(x);//lseed->GetZref(0);
1857 trackParams[3] = lseed->GetX0() * cR - TMath::Sin(TMath::ATan(lseed->GetYref(1)));
1858 trackParams[4] = lseed->GetZref(1) / TMath::Sqrt(1. + lseed->GetYref(1) * lseed->GetYref(1));
1859 trackParams[5] = cR;
1860 Int_t ich = 0; while(!(chamber = stack[ich])) ich++;
1861 trackParams[6] = fGeom->GetSector(chamber->GetDetector());/* *alpha+shift; // Supermodule*/
1862
7e88424f 1863 if(AliTRDReconstructor::GetRecoParam()->GetStreamLevel() > 1){
41702fec 1864 AliInfo(Form("Track %d [%d] nlayers %d trackQuality = %e nused %d, yref = %3.3f", itrack, trackIndex, nlayers, fTrackQuality[trackIndex], nused, trackParams[1]));
1865
1866 Int_t nclusters = 0;
1867 AliTRDseedV1 *dseed[6];
1868 for(int is=0; is<6; is++){
1869 dseed[is] = new AliTRDseedV1(sseed[trackIndex*6+is]);
1870 dseed[is]->SetOwner();
1871 nclusters += sseed[is].GetN2();
1872 }
1873 //Int_t eventNrInFile = esd->GetEventNumberInFile();
1874 //AliInfo(Form("Number of clusters %d.", nclusters));
1875 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
1876 Int_t trackNumber = AliTRDtrackerDebug::GetTrackNumber();
1877 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
1878 TTreeSRedirector &cstreamer = *fgDebugStreamer;
1879 cstreamer << "Clusters2TracksStack"
1880 << "EventNumber=" << eventNumber
1881 << "TrackNumber=" << trackNumber
1882 << "CandidateNumber=" << candidateNumber
1883 << "Iter=" << fSieveSeeding
1884 << "Like=" << fTrackQuality[trackIndex]
1885 << "S0.=" << dseed[0]
1886 << "S1.=" << dseed[1]
1887 << "S2.=" << dseed[2]
1888 << "S3.=" << dseed[3]
1889 << "S4.=" << dseed[4]
1890 << "S5.=" << dseed[5]
1891 << "p0=" << trackParams[0]
1892 << "p1=" << trackParams[1]
1893 << "p2=" << trackParams[2]
1894 << "p3=" << trackParams[3]
1895 << "p4=" << trackParams[4]
1896 << "p5=" << trackParams[5]
1897 << "p6=" << trackParams[6]
1898 << "Label=" << label
1899 << "Label1=" << label1
1900 << "Label2=" << label2
1901 << "FakeRatio=" << fakeratio
1902 << "Freq=" << frequency
1903 << "Ncl=" << ncl
1904 << "NLayers=" << nlayers
1905 << "Findable=" << findable
1906
1907 << "NUsed=" << nused
1908 << "\n";
1909 }
1910
1911 AliTRDtrackV1 *track = MakeTrack(&sseed[trackIndex*kNPlanes], trackParams);
1912 if(!track){
1913 AliWarning("Fail to build a TRD Track.");
1914 continue;
1915 }
1916 //AliInfo("End of MakeTrack()");
1917 AliESDtrack esdTrack;
1918 esdTrack.UpdateTrackParams(track, AliESDtrack::kTRDout);
1919 esdTrack.SetLabel(track->GetLabel());
1920 track->UpdateESDtrack(&esdTrack);
1921 // write ESD-friends if neccessary
7e88424f 1922 if (AliTRDReconstructor::GetRecoParam()->GetStreamLevel() > 0){
41702fec 1923 AliTRDtrackV1 *calibTrack = new AliTRDtrackV1(*track);
1924 calibTrack->SetOwner();
1925 esdTrack.AddCalibObject(calibTrack);
1926 }
1927 new ((*esdTrackList)[ntracks0++]) AliESDtrack(esdTrack);
1928 ntracks1++;
1929 AliTRDtrackerDebug::SetTrackNumber(AliTRDtrackerDebug::GetTrackNumber() + 1);
1930 }
1931
1932 jSieve++;
1933 } while(jSieve<5 && candidates); // end track candidates sieve
1934 if(!ntracks1) break;
1935
1936 // increment counters
1937 ntracks2 += ntracks1;
1938 fSieveSeeding++;
1939
1940 // Rebuild plane configurations and indices taking only unused clusters into account
1941 quality = BuildSeedingConfigs(stack, configs);
7e88424f 1942 if(quality < 1.E-7) break; //AliTRDReconstructor::GetRecoParam()->GetPlaneQualityThreshold()) break;
41702fec 1943
1944 for(Int_t ip = 0; ip < kNPlanes; ip++){
1945 if(!(chamber = stack[ip])) continue;
1946 chamber->Build(fGeom);//Indices(fSieveSeeding);
1947 }
1948
7e88424f 1949 if(AliTRDReconstructor::GetRecoParam()->GetStreamLevel() > 1){
41702fec 1950 AliInfo(Form("Sieve level %d Plane config %d %d %d Quality %f", fSieveSeeding, configs[0], configs[1], configs[2], quality));
1951 }
1952 } while(fSieveSeeding<10); // end stack clusters sieve
1953
1954
1955
1956 //AliInfo(Form("Registered TRD tracks %d in stack %d.", ntracks2, pars[1]));
1957
1958 return ntracks2;
e4f2f73d 1959}
1960
1961//___________________________________________________________________
eb38ed55 1962Double_t AliTRDtrackerV1::BuildSeedingConfigs(AliTRDtrackingChamber **stack, Int_t *configs)
e4f2f73d 1963{
41702fec 1964 //
1965 // Assign probabilities to chambers according to their
1966 // capability of producing seeds.
1967 //
1968 // Parameters :
1969 //
1970 // layers : Array of stack propagation layers for all 6 chambers in one stack
1971 // configs : On exit array of configuration indexes (see GetSeedingConfig()
1972 // for details) in the decreasing order of their seeding probabilities.
1973 //
1974 // Output :
1975 //
1976 // Return top configuration quality
1977 //
1978 // Detailed description:
1979 //
1980 // To each chamber seeding configuration (see GetSeedingConfig() for
1981 // the list of all configurations) one defines 2 quality factors:
1982 // - an apriori topological quality (see GetSeedingConfig() for details) and
1983 // - a data quality based on the uniformity of the distribution of
1984 // clusters over the x range (time bins population). See CookChamberQA() for details.
1985 // The overall chamber quality is given by the product of this 2 contributions.
1986 //
1987
1988 Double_t chamberQ[kNPlanes];
1989 AliTRDtrackingChamber *chamber = 0x0;
1990 for(int iplane=0; iplane<kNPlanes; iplane++){
1991 if(!(chamber = stack[iplane])) continue;
1992 chamberQ[iplane] = (chamber = stack[iplane]) ? chamber->GetQuality() : 0.;
1993 }
1994
1995 Double_t tconfig[kNConfigs];
1996 Int_t planes[4];
1997 for(int iconf=0; iconf<kNConfigs; iconf++){
1998 GetSeedingConfig(iconf, planes);
1999 tconfig[iconf] = fgTopologicQA[iconf];
2000 for(int iplane=0; iplane<4; iplane++) tconfig[iconf] *= chamberQ[planes[iplane]];
2001 }
2002
2003 TMath::Sort((Int_t)kNConfigs, tconfig, configs, kTRUE);
2004 // AliInfo(Form("q[%d] = %f", configs[0], tconfig[configs[0]]));
2005 // AliInfo(Form("q[%d] = %f", configs[1], tconfig[configs[1]]));
2006 // AliInfo(Form("q[%d] = %f", configs[2], tconfig[configs[2]]));
2007
2008 return tconfig[configs[0]];
e4f2f73d 2009}
2010
2011//____________________________________________________________________
eb38ed55 2012Int_t AliTRDtrackerV1::MakeSeeds(AliTRDtrackingChamber **stack, AliTRDseedV1 *sseed, Int_t *ipar)
e4f2f73d 2013{
41702fec 2014 //
2015 // Make tracklet seeds in the TRD stack.
2016 //
2017 // Parameters :
2018 // layers : Array of stack propagation layers containing clusters
2019 // sseed : Array of empty tracklet seeds. On exit they are filled.
2020 // ipar : Control parameters:
2021 // ipar[0] -> seeding chambers configuration
2022 // ipar[1] -> stack index
2023 // ipar[2] -> number of track candidates found so far
2024 //
2025 // Output :
2026 // Number of tracks candidates found.
2027 //
2028 // Detailed description
2029 //
2030 // The following steps are performed:
2031 // 1. Select seeding layers from seeding chambers
2032 // 2. Select seeding clusters from the seeding AliTRDpropagationLayerStack.
2033 // The clusters are taken from layer 3, layer 0, layer 1 and layer 2, in
2034 // this order. The parameters controling the range of accepted clusters in
2035 // layer 0, 1, and 2 are defined in AliTRDchamberTimeBin::BuildCond().
2036 // 3. Helix fit of the cluster set. (see AliTRDtrackerFitter::FitRieman(AliTRDcluster**))
2037 // 4. Initialize seeding tracklets in the seeding chambers.
2038 // 5. Filter 0.
2039 // Chi2 in the Y direction less than threshold ... (1./(3. - sLayer))
2040 // Chi2 in the Z direction less than threshold ... (1./(3. - sLayer))
2041 // 6. Attach clusters to seeding tracklets and find linear approximation of
2042 // the tracklet (see AliTRDseedV1::AttachClustersIter()). The number of used
2043 // clusters used by current seeds should not exceed ... (25).
2044 // 7. Filter 1.
2045 // All 4 seeding tracklets should be correctly constructed (see
2046 // AliTRDseedV1::AttachClustersIter())
2047 // 8. Helix fit of the seeding tracklets
2048 // 9. Filter 2.
2049 // Likelihood calculation of the fit. (See AliTRDtrackerV1::CookLikelihood() for details)
2050 // 10. Extrapolation of the helix fit to the other 2 chambers:
2051 // a) Initialization of extrapolation tracklet with fit parameters
2052 // b) Helix fit of tracklets
2053 // c) Attach clusters and linear interpolation to extrapolated tracklets
2054 // d) Helix fit of tracklets
2055 // 11. Improve seeding tracklets quality by reassigning clusters.
2056 // See AliTRDtrackerV1::ImproveSeedQuality() for details.
2057 // 12. Helix fit of all 6 seeding tracklets and chi2 calculation
2058 // 13. Hyperplane fit and track quality calculation. See AliTRDtrackerFitter::FitHyperplane() for details.
2059 // 14. Cooking labels for tracklets. Should be done only for MC
2060 // 15. Register seeds.
2061 //
2062
2063 AliTRDtrackingChamber *chamber = 0x0;
2064 AliTRDcluster *c[4] = {0x0, 0x0, 0x0, 0x0}; // initilize seeding clusters
2065 AliTRDseedV1 *cseed = &sseed[0]; // initialize tracklets for first track
2066 Int_t ncl, mcl; // working variable for looping over clusters
2067 Int_t index[AliTRDchamberTimeBin::kMaxClustersLayer], jndex[AliTRDchamberTimeBin::kMaxClustersLayer];
2068 // chi2 storage
2069 // chi2[0] = tracklet chi2 on the Z direction
2070 // chi2[1] = tracklet chi2 on the R direction
2071 Double_t chi2[4];
2072
2073
2074 // this should be data member of AliTRDtrack
2075 Double_t seedQuality[kMaxTracksStack];
2076
2077 // unpack control parameters
2078 Int_t config = ipar[0];
2079 Int_t ntracks = ipar[1];
2080 Int_t planes[kNSeedPlanes]; GetSeedingConfig(config, planes);
2081
2082 // Init chambers geometry
2083 Int_t ic = 0; while(!(chamber = stack[ic])) ic++;
053767a4 2084 Int_t istack = fGeom->GetStack(chamber->GetDetector());
41702fec 2085 Double_t hL[kNPlanes]; // Tilting angle
2086 Float_t padlength[kNPlanes]; // pad lenghts
2087 AliTRDpadPlane *pp = 0x0;
2088 for(int iplane=0; iplane<kNPlanes; iplane++){
2089 pp = fGeom->GetPadPlane(iplane, istack);
2090 hL[iplane] = TMath::Tan(-TMath::DegToRad()*pp->GetTiltingAngle());
2091 padlength[iplane] = pp->GetLengthIPad();
2092 }
2093
7e88424f 2094 if(AliTRDReconstructor::GetRecoParam()->GetStreamLevel() > 1){
41702fec 2095 AliInfo(Form("Making seeds Stack[%d] Config[%d] Tracks[%d]...", istack, config, ntracks));
2096 }
2097
d611c74f 2098 ResetSeedTB();
41702fec 2099 Int_t nlayers = 0;
41702fec 2100 for(int isl=0; isl<kNSeedPlanes; isl++){
2101 if(!(chamber = stack[planes[isl]])) continue;
d611c74f 2102 if(!chamber->GetSeedingLayer(fSeedTB[isl], fGeom)) continue;
41702fec 2103 nlayers++;
41702fec 2104 }
2105 if(nlayers < 4) return 0;
2106
2107
2108 // Start finding seeds
2109 Double_t cond0[4], cond1[4], cond2[4];
2110 Int_t icl = 0;
d611c74f 2111 while((c[3] = (*fSeedTB[3])[icl++])){
41702fec 2112 if(!c[3]) continue;
d611c74f 2113 fSeedTB[0]->BuildCond(c[3], cond0, 0);
2114 fSeedTB[0]->GetClusters(cond0, index, ncl);
41702fec 2115 //printf("Found c[3] candidates 0 %d\n", ncl);
2116 Int_t jcl = 0;
2117 while(jcl<ncl) {
d611c74f 2118 c[0] = (*fSeedTB[0])[index[jcl++]];
41702fec 2119 if(!c[0]) continue;
2120 Double_t dx = c[3]->GetX() - c[0]->GetX();
2121 Double_t theta = (c[3]->GetZ() - c[0]->GetZ())/dx;
2122 Double_t phi = (c[3]->GetY() - c[0]->GetY())/dx;
d611c74f 2123 fSeedTB[1]->BuildCond(c[0], cond1, 1, theta, phi);
2124 fSeedTB[1]->GetClusters(cond1, jndex, mcl);
41702fec 2125 //printf("Found c[0] candidates 1 %d\n", mcl);
2126
2127 Int_t kcl = 0;
2128 while(kcl<mcl) {
d611c74f 2129 c[1] = (*fSeedTB[1])[jndex[kcl++]];
2130 if(!c[1]) continue;
2131 fSeedTB[2]->BuildCond(c[1], cond2, 2, theta, phi);
2132 c[2] = fSeedTB[2]->GetNearestCluster(cond2);
2133 //printf("Found c[1] candidate 2 %p\n", c[2]);
2134 if(!c[2]) continue;
2135
2136 // AliInfo("Seeding clusters found. Building seeds ...");
2137 // 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());
2138
2139 for (Int_t il = 0; il < 6; il++) cseed[il].Reset();
41702fec 2140
d611c74f 2141 FitRieman(c, chi2);
2142
2143 AliTRDseedV1 *tseed = 0x0;
2144 for(int iLayer=0; iLayer<kNSeedPlanes; iLayer++){
2145 Int_t jLayer = planes[iLayer];
2146 tseed = &cseed[jLayer];
2147 tseed->SetPlane(jLayer);
2148 tseed->SetTilt(hL[jLayer]);
2149 tseed->SetPadLength(padlength[jLayer]);
2150 tseed->SetX0(stack[jLayer]->GetX());
2151 tseed->Init(GetRiemanFitter());
2152 }
2153
2154 Bool_t isFake = kFALSE;
7e88424f 2155 if(AliTRDReconstructor::GetRecoParam()->GetStreamLevel() >= 2){
d611c74f 2156 if (c[0]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
2157 if (c[1]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
2158 if (c[2]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
2159
2160 Double_t xpos[4];
2161 for(Int_t l = 0; l < kNSeedPlanes; l++) xpos[l] = fSeedTB[l]->GetX();
2162 Float_t yref[4];
2163 for(int il=0; il<4; il++) yref[il] = cseed[planes[il]].GetYref(0);
2164 Int_t ll = c[3]->GetLabel(0);
2165 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2166 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2167 AliRieman *rim = GetRiemanFitter();
2168 TTreeSRedirector &cs0 = *fgDebugStreamer;
2169 cs0 << "MakeSeeds0"
2170 <<"EventNumber=" << eventNumber
2171 <<"CandidateNumber=" << candidateNumber
2172 <<"isFake=" << isFake
2173 <<"config=" << config
2174 <<"label=" << ll
2175 <<"chi2z=" << chi2[0]
2176 <<"chi2y=" << chi2[1]
2177 <<"Y2exp=" << cond2[0]
2178 <<"Z2exp=" << cond2[1]
2179 <<"X0=" << xpos[0] //layer[sLayer]->GetX()
2180 <<"X1=" << xpos[1] //layer[sLayer + 1]->GetX()
2181 <<"X2=" << xpos[2] //layer[sLayer + 2]->GetX()
2182 <<"X3=" << xpos[3] //layer[sLayer + 3]->GetX()
2183 <<"yref0=" << yref[0]
2184 <<"yref1=" << yref[1]
2185 <<"yref2=" << yref[2]
2186 <<"yref3=" << yref[3]
2187 <<"c0.=" << c[0]
2188 <<"c1.=" << c[1]
2189 <<"c2.=" << c[2]
2190 <<"c3.=" << c[3]
2191 <<"Seed0.=" << &cseed[planes[0]]
2192 <<"Seed1.=" << &cseed[planes[1]]
2193 <<"Seed2.=" << &cseed[planes[2]]
2194 <<"Seed3.=" << &cseed[planes[3]]
2195 <<"RiemanFitter.=" << rim
2196 <<"\n";
2197 }
2198
7e88424f 2199 if(chi2[0] > AliTRDReconstructor::GetRecoParam()->GetChi2Z()/*7./(3. - sLayer)*//*iter*/){
d611c74f 2200 //AliInfo(Form("Failed chi2 filter on chi2Z [%f].", chi2[0]));
2201 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2202 continue;
2203 }
7e88424f 2204 if(chi2[1] > AliTRDReconstructor::GetRecoParam()->GetChi2Y()/*1./(3. - sLayer)*//*iter*/){
d611c74f 2205 //AliInfo(Form("Failed chi2 filter on chi2Y [%f].", chi2[1]));
2206 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2207 continue;
2208 }
2209 //AliInfo("Passed chi2 filter.");
2210
2211 // try attaching clusters to tracklets
2212 Int_t nUsedCl = 0;
2213 Int_t mlayers = 0;
2214 for(int iLayer=0; iLayer<kNSeedPlanes; iLayer++){
2215 Int_t jLayer = planes[iLayer];
2216 if(!cseed[jLayer].AttachClustersIter(stack[jLayer], 5., kFALSE, c[iLayer])) continue;
2217 nUsedCl += cseed[jLayer].GetNUsed();
2218 if(nUsedCl > 25) break;
2219 mlayers++;
2220 }
2221 if(mlayers < kNSeedPlanes){
2222 //AliInfo(Form("Failed updating all seeds %d [%d].", mlayers, kNSeedPlanes));
2223 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2224 continue;
2225 }
2226 // fit tracklets and cook likelihood
2227 FitTiltedRieman(&cseed[0], kTRUE);// Update Seeds and calculate Likelihood
2228 chi2[0] = GetChi2Y(&cseed[0]);
2229 chi2[1] = GetChi2Z(&cseed[0]);
2230 //Chi2 definitions in testing stage
2231 //chi2[0] = GetChi2YTest(&cseed[0]);
2232 //chi2[1] = GetChi2ZTest(&cseed[0]);
2233 Double_t like = CookLikelihood(&cseed[0], planes, chi2); // to be checked
2234
7e88424f 2235 if (TMath::Log(1.E-9 + like) < AliTRDReconstructor::GetRecoParam()->GetTrackLikelihood()){
d611c74f 2236 //AliInfo(Form("Failed likelihood %f[%e].", TMath::Log(1.E-9 + like), like));
2237 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2238 continue;
2239 }
2240 //AliInfo(Form("Passed likelihood %f[%e].", TMath::Log(1.E-9 + like), like));
2241
2242 // book preliminary results
2243 seedQuality[ntracks] = like;
2244 fSeedLayer[ntracks] = config;/*sLayer;*/
2245
2246 // attach clusters to the extrapolation seeds
2247 Int_t lextrap[2];
2248 GetExtrapolationConfig(config, lextrap);
2249 Int_t nusedf = 0; // debug value
2250 for(int iLayer=0; iLayer<2; iLayer++){
2251 Int_t jLayer = lextrap[iLayer];
2252 if(!(chamber = stack[jLayer])) continue;
2253
2254 // prepare extrapolated seed
2255 cseed[jLayer].Reset();
2256 cseed[jLayer].SetPlane(jLayer);
2257 cseed[jLayer].SetTilt(hL[jLayer]);
2258 cseed[jLayer].SetX0(chamber->GetX());
2259 cseed[jLayer].SetPadLength(padlength[jLayer]);
2260
2261 // fit extrapolated seed
2262 if ((jLayer == 0) && !(cseed[1].IsOK())) continue;
2263 if ((jLayer == 5) && !(cseed[4].IsOK())) continue;
2264 AliTRDseedV1 pseed = cseed[jLayer];
2265 if(!pseed.AttachClustersIter(chamber, 1000.)) continue;
2266 cseed[jLayer] = pseed;
2267 nusedf += cseed[jLayer].GetNUsed(); // debug value
2268 FitTiltedRieman(cseed, kTRUE);
2269 }
2270
2271 // AliInfo("Extrapolation done.");
2272 // Debug Stream containing all the 6 tracklets
7e88424f 2273 if(AliTRDReconstructor::GetRecoParam()->GetStreamLevel() >= 2){
d611c74f 2274 TTreeSRedirector &cstreamer = *fgDebugStreamer;
2275 TLinearFitter *tiltedRieman = GetTiltedRiemanFitter();
2276 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2277 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2278 cstreamer << "MakeSeeds1"
2279 << "EventNumber=" << eventNumber
2280 << "CandidateNumber=" << candidateNumber
2281 << "S0.=" << &cseed[0]
2282 << "S1.=" << &cseed[1]
2283 << "S2.=" << &cseed[2]
2284 << "S3.=" << &cseed[3]
2285 << "S4.=" << &cseed[4]
2286 << "S5.=" << &cseed[5]
2287 << "FitterT.=" << tiltedRieman
2288 << "\n";
2289 }
2290
2291 if(ImproveSeedQuality(stack, cseed) < 4){
2292 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2293 continue;
2294 }
2295 //AliInfo("Improve seed quality done.");
2296
2297 // fit full track and cook likelihoods
2298 // Double_t curv = FitRieman(&cseed[0], chi2);
2299 // Double_t chi2ZF = chi2[0] / TMath::Max((mlayers - 3.), 1.);
2300 // Double_t chi2RF = chi2[1] / TMath::Max((mlayers - 3.), 1.);
2301
2302 // do the final track fitting (Once with vertex constraint and once without vertex constraint)
2303 Double_t chi2Vals[3];
2304 chi2Vals[0] = FitTiltedRieman(&cseed[0], kFALSE);
7e88424f 2305 if(AliTRDReconstructor::GetRecoParam()->IsVertexConstrained())
d611c74f 2306 chi2Vals[1] = FitTiltedRiemanConstraint(&cseed[0], GetZ()); // Do Vertex Constrained fit if desired
2307 else
2308 chi2Vals[1] = 1.;
2309 chi2Vals[2] = GetChi2Z(&cseed[0]) / TMath::Max((mlayers - 3.), 1.);
2310 // Chi2 definitions in testing stage
2311 //chi2Vals[2] = GetChi2ZTest(&cseed[0]);
2312 fTrackQuality[ntracks] = CalculateTrackLikelihood(&cseed[0], &chi2Vals[0]);
2313 //AliInfo("Hyperplane fit done\n");
2314
2315 // finalize tracklets
2316 Int_t labels[12];
2317 Int_t outlab[24];
2318 Int_t nlab = 0;
2319 for (Int_t iLayer = 0; iLayer < 6; iLayer++) {
2320 if (!cseed[iLayer].IsOK()) continue;
2321
2322 if (cseed[iLayer].GetLabels(0) >= 0) {
2323 labels[nlab] = cseed[iLayer].GetLabels(0);
2324 nlab++;
2325 }
2326
2327 if (cseed[iLayer].GetLabels(1) >= 0) {
2328 labels[nlab] = cseed[iLayer].GetLabels(1);
2329 nlab++;
2330 }
2331 }
2332 Freq(nlab,labels,outlab,kFALSE);
2333 Int_t label = outlab[0];
2334 Int_t frequency = outlab[1];
2335 for (Int_t iLayer = 0; iLayer < 6; iLayer++) {
2336 cseed[iLayer].SetFreq(frequency);
2337 cseed[iLayer].SetChi2Z(chi2[1]);
2338 }
2339
7e88424f 2340 if(AliTRDReconstructor::GetRecoParam()->GetStreamLevel() >= 2){
d611c74f 2341 TTreeSRedirector &cstreamer = *fgDebugStreamer;
2342 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2343 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2344 TLinearFitter *fitterTC = GetTiltedRiemanFitterConstraint();
2345 TLinearFitter *fitterT = GetTiltedRiemanFitter();
2346 cstreamer << "MakeSeeds2"
2347 << "EventNumber=" << eventNumber
2348 << "CandidateNumber=" << candidateNumber
2349 << "Chi2TR=" << chi2Vals[0]
2350 << "Chi2TC=" << chi2Vals[1]
2351 << "Nlayers=" << mlayers
2352 << "NUsedS=" << nUsedCl
2353 << "NUsed=" << nusedf
2354 << "Like=" << like
2355 << "S0.=" << &cseed[0]
2356 << "S1.=" << &cseed[1]
2357 << "S2.=" << &cseed[2]
2358 << "S3.=" << &cseed[3]
2359 << "S4.=" << &cseed[4]
2360 << "S5.=" << &cseed[5]
2361 << "Label=" << label
2362 << "Freq=" << frequency
2363 << "FitterT.=" << fitterT
2364 << "FitterTC.=" << fitterTC
2365 << "\n";
2366 }
2367
2368 ntracks++;
2369 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2370 if(ntracks == kMaxTracksStack){
2371 AliWarning(Form("Number of seeds reached maximum allowed (%d) in stack.", kMaxTracksStack));
2372 return ntracks;
2373 }
2374 cseed += 6;
41702fec 2375 }
2376 }
2377 }
41702fec 2378
2379 return ntracks;
e4f2f73d 2380}
2381
2382//_____________________________________________________________________________
0906e73e 2383AliTRDtrackV1* AliTRDtrackerV1::MakeTrack(AliTRDseedV1 *seeds, Double_t *params)
e4f2f73d 2384{
41702fec 2385 //
2386 // Build a TRD track out of tracklet candidates
2387 //
2388 // Parameters :
2389 // seeds : array of tracklets
2390 // params : track parameters (see MakeSeeds() function body for a detailed description)
2391 //
2392 // Output :
2393 // The TRD track.
2394 //
2395 // Detailed description
2396 //
2397 // To be discussed with Marian !!
2398 //
2399
2400 AliTRDCalibraFillHisto *calibra = AliTRDCalibraFillHisto::Instance();
2401 if (!calibra) AliInfo("Could not get Calibra instance\n");
2402
2403 Double_t alpha = AliTRDgeometry::GetAlpha();
2404 Double_t shift = AliTRDgeometry::GetAlpha()/2.0;
2405 Double_t c[15];
2406
2407 c[ 0] = 0.2;
2408 c[ 1] = 0.0; c[ 2] = 2.0;
2409 c[ 3] = 0.0; c[ 4] = 0.0; c[ 5] = 0.02;
2410 c[ 6] = 0.0; c[ 7] = 0.0; c[ 8] = 0.0; c[ 9] = 0.1;
2411 c[10] = 0.0; c[11] = 0.0; c[12] = 0.0; c[13] = 0.0; c[14] = params[5]*params[5]*0.01;
2412
d20df6fc 2413 AliTRDtrackV1 track(seeds, &params[1], c, params[0], params[6]*alpha+shift);
2414 track.PropagateTo(params[0]-5.0);
2415 track.ResetCovariance(1);
2416 Int_t nc = FollowBackProlongation(track);
2417 if (nc < 30) return 0x0;
2418
2419 AliTRDtrackV1 *ptrTrack = SetTrack(&track);
2420 ptrTrack->CookLabel(.9);
2421 // computes PID for track
2422 ptrTrack->CookPID();
2423 // update calibration references using this track
2424 if(calibra->GetHisto2d()) calibra->UpdateHistogramsV1(ptrTrack);
2425
2426 return ptrTrack;
e4f2f73d 2427}
2428
0906e73e 2429
e4f2f73d 2430//____________________________________________________________________
eb38ed55 2431Int_t AliTRDtrackerV1::ImproveSeedQuality(AliTRDtrackingChamber **stack, AliTRDseedV1 *cseed)
e4f2f73d 2432{
41702fec 2433 //
2434 // Sort tracklets according to "quality" and try to "improve" the first 4 worst
2435 //
2436 // Parameters :
2437 // layers : Array of propagation layers for a stack/supermodule
2438 // cseed : Array of 6 seeding tracklets which has to be improved
2439 //
2440 // Output :
2441 // cssed : Improved seeds
2442 //
2443 // Detailed description
2444 //
2445 // Iterative procedure in which new clusters are searched for each
2446 // tracklet seed such that the seed quality (see AliTRDseed::GetQuality())
2447 // can be maximized. If some optimization is found the old seeds are replaced.
2448 //
2449 // debug level: 7
2450 //
2451
2452 // make a local working copy
2453 AliTRDtrackingChamber *chamber = 0x0;
2454 AliTRDseedV1 bseed[6];
2455 Int_t nLayers = 0;
2456 for (Int_t jLayer = 0; jLayer < 6; jLayer++) bseed[jLayer] = cseed[jLayer];
2457
2458 Float_t lastquality = 10000.0;
2459 Float_t lastchi2 = 10000.0;
2460 Float_t chi2 = 1000.0;
2461
2462 for (Int_t iter = 0; iter < 4; iter++) {
2463 Float_t sumquality = 0.0;
2464 Float_t squality[6];
2465 Int_t sortindexes[6];
2466
2467 for (Int_t jLayer = 0; jLayer < 6; jLayer++) {
2468 squality[jLayer] = bseed[jLayer].IsOK() ? bseed[jLayer].GetQuality(kTRUE) : -1.;
2469 sumquality += squality[jLayer];
2470 }
2471 if ((sumquality >= lastquality) || (chi2 > lastchi2)) break;
2472
2473 nLayers = 0;
2474 lastquality = sumquality;
2475 lastchi2 = chi2;
2476 if (iter > 0) for (Int_t jLayer = 0; jLayer < 6; jLayer++) cseed[jLayer] = bseed[jLayer];
2477
2478 TMath::Sort(6, squality, sortindexes, kFALSE);
2479 for (Int_t jLayer = 5; jLayer > 1; jLayer--) {
2480 Int_t bLayer = sortindexes[jLayer];
2481 if(!(chamber = stack[bLayer])) continue;
2482 bseed[bLayer].AttachClustersIter(chamber, squality[bLayer], kTRUE);
2483 if(bseed[bLayer].IsOK()) nLayers++;
2484 }
2485
2486 chi2 = FitTiltedRieman(bseed, kTRUE);
7e88424f 2487 if(AliTRDReconstructor::GetRecoParam()->GetStreamLevel() >= 7){
41702fec 2488 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2489 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2490 TLinearFitter *tiltedRieman = GetTiltedRiemanFitter();
2491 TTreeSRedirector &cstreamer = *fgDebugStreamer;
2492 cstreamer << "ImproveSeedQuality"
2493 << "EventNumber=" << eventNumber
2494 << "CandidateNumber=" << candidateNumber
2495 << "Iteration=" << iter
2496 << "S0.=" << &bseed[0]
2497 << "S1.=" << &bseed[1]
2498 << "S2.=" << &bseed[2]
2499 << "S3.=" << &bseed[3]
2500 << "S4.=" << &bseed[4]
2501 << "S5.=" << &bseed[5]
2502 << "FitterT.=" << tiltedRieman
2503 << "\n";
2504 }
2505 } // Loop: iter
2506
2507 // we are sure that at least 2 tracklets are OK !
2508 return nLayers+2;
e4f2f73d 2509}
2510
eb38ed55 2511//_________________________________________________________________________
2512Double_t AliTRDtrackerV1::CalculateTrackLikelihood(AliTRDseedV1 *tracklets, Double_t *chi2){
41702fec 2513 //
2514 // Calculates the Track Likelihood value. This parameter serves as main quality criterion for
2515 // the track selection
2516 // The likelihood value containes:
2517 // - The chi2 values from the both fitters and the chi2 values in z-direction from a linear fit
2518 // - The Sum of the Parameter |slope_ref - slope_fit|/Sigma of the tracklets
2519 // For all Parameters an exponential dependency is used
2520 //
2521 // Parameters: - Array of tracklets (AliTRDseedV1) related to the track candidate
2522 // - Array of chi2 values:
2523 // * Non-Constrained Tilted Riemann fit
2524 // * Vertex-Constrained Tilted Riemann fit
2525 // * z-Direction from Linear fit
2526 // Output: - The calculated track likelihood
2527 //
2528 // debug level 2
2529 //
2530
2531 Double_t sumdaf = 0, nLayers = 0;
2532 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
2533 if(!tracklets[iLayer].IsOK()) continue;
2534 sumdaf += TMath::Abs((tracklets[iLayer].GetYfit(1) - tracklets[iLayer].GetYref(1))/ tracklets[iLayer].GetSigmaY2());
2535 nLayers++;
2536 }
2537 sumdaf /= Float_t (nLayers - 2.0);
2538
2539 Double_t likeChi2Z = TMath::Exp(-chi2[2] * 0.14); // Chi2Z
7e88424f 2540 Double_t likeChi2TC = (AliTRDReconstructor::GetRecoParam()->IsVertexConstrained()) ?
d20df6fc 2541 TMath::Exp(-chi2[1] * 0.677) : 1; // Constrained Tilted Riemann
41702fec 2542 Double_t likeChi2TR = TMath::Exp(-chi2[0] * 0.78); // Non-constrained Tilted Riemann
2543 Double_t likeAF = TMath::Exp(-sumdaf * 3.23);
2544 Double_t trackLikelihood = likeChi2Z * likeChi2TR * likeAF;
2545
7e88424f 2546 if(AliTRDReconstructor::GetRecoParam()->GetStreamLevel() >= 2){
41702fec 2547 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2548 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2549 TTreeSRedirector &cstreamer = *fgDebugStreamer;
2550 cstreamer << "CalculateTrackLikelihood0"
2551 << "EventNumber=" << eventNumber
2552 << "CandidateNumber=" << candidateNumber
2553 << "LikeChi2Z=" << likeChi2Z
2554 << "LikeChi2TR=" << likeChi2TR
2555 << "LikeChi2TC=" << likeChi2TC
2556 << "LikeAF=" << likeAF
2557 << "TrackLikelihood=" << trackLikelihood
2558 << "\n";
2559 }
2560
2561 return trackLikelihood;
e4f2f73d 2562}
2563
2564//____________________________________________________________________
eb38ed55 2565Double_t AliTRDtrackerV1::CookLikelihood(AliTRDseedV1 *cseed, Int_t planes[4]
41702fec 2566 , Double_t *chi2)
e4f2f73d 2567{
41702fec 2568 //
2569 // Calculate the probability of this track candidate.
2570 //
2571 // Parameters :
2572 // cseeds : array of candidate tracklets
2573 // planes : array of seeding planes (see seeding configuration)
2574 // chi2 : chi2 values (on the Z and Y direction) from the rieman fit of the track.
2575 //
2576 // Output :
2577 // likelihood value
2578 //
2579 // Detailed description
2580 //
2581 // The track quality is estimated based on the following 4 criteria:
2582 // 1. precision of the rieman fit on the Y direction (likea)
2583 // 2. chi2 on the Y direction (likechi2y)
2584 // 3. chi2 on the Z direction (likechi2z)
2585 // 4. number of attached clusters compared to a reference value
2586 // (see AliTRDrecoParam::fkFindable) (likeN)
2587 //
2588 // The distributions for each type of probabilities are given below as of
2589 // (date). They have to be checked to assure consistency of estimation.
2590 //
2591
2592 // ratio of the total number of clusters/track which are expected to be found by the tracker.
7e88424f 2593 Float_t fgFindable = AliTRDReconstructor::GetRecoParam()->GetFindableClusters();
41702fec 2594
2595
2596 Int_t nclusters = 0;
2597 Double_t sumda = 0.;
2598 for(UChar_t ilayer = 0; ilayer < 4; ilayer++){
2599 Int_t jlayer = planes[ilayer];
2600 nclusters += cseed[jlayer].GetN2();
2601 sumda += TMath::Abs(cseed[jlayer].GetYfitR(1) - cseed[jlayer].GetYref(1));
2602 }
2603 Double_t likea = TMath::Exp(-sumda*10.6);
2604 Double_t likechi2y = 0.0000000001;
2605 if (chi2[0] < 0.5) likechi2y += TMath::Exp(-TMath::Sqrt(chi2[0]) * 7.73);
2606 Double_t likechi2z = TMath::Exp(-chi2[1] * 0.088) / TMath::Exp(-chi2[1] * 0.019);
2607 Int_t enc = Int_t(fgFindable*4.*fgNTimeBins); // Expected Number Of Clusters, normally 72
2608 Double_t likeN = TMath::Exp(-(enc - nclusters) * 0.19);
2609
2610 Double_t like = likea * likechi2y * likechi2z * likeN;
2611
2612 // 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));
7e88424f 2613 if(AliTRDReconstructor::GetRecoParam()->GetStreamLevel() >= 2){
41702fec 2614 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2615 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2616 // The Debug Stream contains the seed
2617 TTreeSRedirector &cstreamer = *fgDebugStreamer;
2618 cstreamer << "CookLikelihood"
2619 << "EventNumber=" << eventNumber
2620 << "CandidateNumber=" << candidateNumber
2621 << "tracklet0.=" << &cseed[0]
2622 << "tracklet1.=" << &cseed[1]
2623 << "tracklet2.=" << &cseed[2]
2624 << "tracklet3.=" << &cseed[3]
2625 << "tracklet4.=" << &cseed[4]
2626 << "tracklet5.=" << &cseed[5]
2627 << "sumda=" << sumda
2628 << "chi0=" << chi2[0]
2629 << "chi1=" << chi2[1]
2630 << "likea=" << likea
2631 << "likechi2y=" << likechi2y
2632 << "likechi2z=" << likechi2z
2633 << "nclusters=" << nclusters
2634 << "likeN=" << likeN
2635 << "like=" << like
2636 << "\n";
2637 }
2638
2639 return like;
e4f2f73d 2640}
2641
eb38ed55 2642
e4f2f73d 2643
2644//____________________________________________________________________
0906e73e 2645void AliTRDtrackerV1::GetSeedingConfig(Int_t iconfig, Int_t planes[4])
e4f2f73d 2646{
41702fec 2647 //
2648 // Map seeding configurations to detector planes.
2649 //
2650 // Parameters :
2651 // iconfig : configuration index
2652 // planes : member planes of this configuration. On input empty.
2653 //
2654 // Output :
2655 // planes : contains the planes which are defining the configuration
2656 //
2657 // Detailed description
2658 //
2659 // Here is the list of seeding planes configurations together with
2660 // their topological classification:
2661 //
2662 // 0 - 5432 TQ 0
2663 // 1 - 4321 TQ 0
2664 // 2 - 3210 TQ 0
2665 // 3 - 5321 TQ 1
2666 // 4 - 4210 TQ 1
2667 // 5 - 5431 TQ 1
2668 // 6 - 4320 TQ 1
2669 // 7 - 5430 TQ 2
2670 // 8 - 5210 TQ 2
2671 // 9 - 5421 TQ 3
2672 // 10 - 4310 TQ 3
2673 // 11 - 5410 TQ 4
2674 // 12 - 5420 TQ 5
2675 // 13 - 5320 TQ 5
2676 // 14 - 5310 TQ 5
2677 //
2678 // The topologic quality is modeled as follows:
2679 // 1. The general model is define by the equation:
2680 // p(conf) = exp(-conf/2)
2681 // 2. According to the topologic classification, configurations from the same
2682 // class are assigned the agerage value over the model values.
2683 // 3. Quality values are normalized.
2684 //
2685 // The topologic quality distribution as function of configuration is given below:
2686 //Begin_Html
2687 // <img src="gif/topologicQA.gif">
2688 //End_Html
2689 //
2690
2691 switch(iconfig){
2692 case 0: // 5432 TQ 0
2693 planes[0] = 2;
2694 planes[1] = 3;
2695 planes[2] = 4;
2696 planes[3] = 5;
2697 break;
2698 case 1: // 4321 TQ 0
2699 planes[0] = 1;
2700 planes[1] = 2;
2701 planes[2] = 3;
2702 planes[3] = 4;
2703 break;
2704 case 2: // 3210 TQ 0
2705 planes[0] = 0;
2706 planes[1] = 1;
2707 planes[2] = 2;
2708 planes[3] = 3;
2709 break;
2710 case 3: // 5321 TQ 1
2711 planes[0] = 1;
2712 planes[1] = 2;
2713 planes[2] = 3;
2714 planes[3] = 5;
2715 break;
2716 case 4: // 4210 TQ 1
2717 planes[0] = 0;
2718 planes[1] = 1;
2719 planes[2] = 2;
2720 planes[3] = 4;
2721 break;
2722 case 5: // 5431 TQ 1
2723 planes[0] = 1;
2724 planes[1] = 3;
2725 planes[2] = 4;
2726 planes[3] = 5;
2727 break;
2728 case 6: // 4320 TQ 1
2729 planes[0] = 0;
2730 planes[1] = 2;
2731 planes[2] = 3;
2732 planes[3] = 4;
2733 break;
2734 case 7: // 5430 TQ 2
2735 planes[0] = 0;
2736 planes[1] = 3;
2737 planes[2] = 4;
2738 planes[3] = 5;
2739 break;
2740 case 8: // 5210 TQ 2
2741 planes[0] = 0;
2742 planes[1] = 1;
2743 planes[2] = 2;
2744 planes[3] = 5;
2745 break;
2746 case 9: // 5421 TQ 3
2747 planes[0] = 1;
2748 planes[1] = 2;
2749 planes[2] = 4;
2750 planes[3] = 5;
2751 break;
2752 case 10: // 4310 TQ 3
2753 planes[0] = 0;
2754 planes[1] = 1;
2755 planes[2] = 3;
2756 planes[3] = 4;
2757 break;
2758 case 11: // 5410 TQ 4
2759 planes[0] = 0;
2760 planes[1] = 1;
2761 planes[2] = 4;
2762 planes[3] = 5;
2763 break;
2764 case 12: // 5420 TQ 5
2765 planes[0] = 0;
2766 planes[1] = 2;
2767 planes[2] = 4;
2768 planes[3] = 5;
2769 break;
2770 case 13: // 5320 TQ 5
2771 planes[0] = 0;
2772 planes[1] = 2;
2773 planes[2] = 3;
2774 planes[3] = 5;
2775 break;
2776 case 14: // 5310 TQ 5
2777 planes[0] = 0;
2778 planes[1] = 1;
2779 planes[2] = 3;
2780 planes[3] = 5;
2781 break;
2782 }
e4f2f73d 2783}
2784
2785//____________________________________________________________________
0906e73e 2786void AliTRDtrackerV1::GetExtrapolationConfig(Int_t iconfig, Int_t planes[2])
e4f2f73d 2787{
41702fec 2788 //
2789 // Returns the extrapolation planes for a seeding configuration.
2790 //
2791 // Parameters :
2792 // iconfig : configuration index
2793 // planes : planes which are not in this configuration. On input empty.
2794 //
2795 // Output :
2796 // planes : contains the planes which are not in the configuration
2797 //
2798 // Detailed description
2799 //
2800
2801 switch(iconfig){
2802 case 0: // 5432 TQ 0
2803 planes[0] = 1;
2804 planes[1] = 0;
2805 break;
2806 case 1: // 4321 TQ 0
2807 planes[0] = 5;
2808 planes[1] = 0;
2809 break;
2810 case 2: // 3210 TQ 0
2811 planes[0] = 4;
2812 planes[1] = 5;
2813 break;
2814 case 3: // 5321 TQ 1
2815 planes[0] = 4;
2816 planes[1] = 0;
2817 break;
2818 case 4: // 4210 TQ 1
2819 planes[0] = 5;
2820 planes[1] = 3;
2821 break;
2822 case 5: // 5431 TQ 1
2823 planes[0] = 2;
2824 planes[1] = 0;
2825 break;
2826 case 6: // 4320 TQ 1
2827 planes[0] = 5;
2828 planes[1] = 1;
2829 break;
2830 case 7: // 5430 TQ 2
2831 planes[0] = 2;
2832 planes[1] = 1;
2833 break;
2834 case 8: // 5210 TQ 2
2835 planes[0] = 4;
2836 planes[1] = 3;
2837 break;
2838 case 9: // 5421 TQ 3
2839 planes[0] = 3;
2840 planes[1] = 0;
2841 break;
2842 case 10: // 4310 TQ 3
2843 planes[0] = 5;
2844 planes[1] = 2;
2845 break;
2846 case 11: // 5410 TQ 4
2847 planes[0] = 3;
2848 planes[1] = 2;
2849 break;
2850 case 12: // 5420 TQ 5
2851 planes[0] = 3;
2852 planes[1] = 1;
2853 break;
2854 case 13: // 5320 TQ 5
2855 planes[0] = 4;
2856 planes[1] = 1;
2857 break;
2858 case 14: // 5310 TQ 5
2859 planes[0] = 4;
2860 planes[1] = 2;
2861 break;
2862 }
e4f2f73d 2863}
eb38ed55 2864
2865//____________________________________________________________________
2866AliCluster* AliTRDtrackerV1::GetCluster(Int_t idx) const
2867{
41702fec 2868 Int_t ncls = fClusters->GetEntriesFast();
2f7514a6 2869 return idx >= 0 && idx < ncls ? (AliCluster*)fClusters->UncheckedAt(idx) : 0x0;
eb38ed55 2870}
2871
3b57a3f7 2872//____________________________________________________________________
2873AliTRDseedV1* AliTRDtrackerV1::GetTracklet(Int_t idx) const
2874{
41702fec 2875 Int_t ntrklt = fTracklets->GetEntriesFast();
2f7514a6 2876 return idx >= 0 && idx < ntrklt ? (AliTRDseedV1*)fTracklets->UncheckedAt(idx) : 0x0;
3b57a3f7 2877}
2878
2879//____________________________________________________________________
2880AliKalmanTrack* AliTRDtrackerV1::GetTrack(Int_t idx) const
2881{
41702fec 2882 Int_t ntrk = fTracks->GetEntriesFast();
2f7514a6 2883 return idx >= 0 && idx < ntrk ? (AliKalmanTrack*)fTracks->UncheckedAt(idx) : 0x0;
3b57a3f7 2884}
2885
bb56afff 2886//____________________________________________________________________
2887Float_t AliTRDtrackerV1::CalculateReferenceX(AliTRDseedV1 *tracklets){
41702fec 2888 //
2889 // Calculates the reference x-position for the tilted Rieman fit defined as middle
2890 // of the stack (middle between layers 2 and 3). For the calculation all the tracklets
2891 // are taken into account
2892 //
2893 // Parameters: - Array of tracklets(AliTRDseedV1)
2894 //
2895 // Output: - The reference x-position(Float_t)
2896 //
2897 Int_t nDistances = 0;
2898 Float_t meanDistance = 0.;
2899 Int_t startIndex = 5;
2900 for(Int_t il =5; il > 0; il--){
2901 if(tracklets[il].IsOK() && tracklets[il -1].IsOK()){
2902 Float_t xdiff = tracklets[il].GetX0() - tracklets[il -1].GetX0();
2903 meanDistance += xdiff;
2904 nDistances++;
2905 }
2906 if(tracklets[il].IsOK()) startIndex = il;
2907 }
2908 if(tracklets[0].IsOK()) startIndex = 0;
2909 if(!nDistances){
2910 // We should normally never get here
2911 Float_t xpos[2]; memset(xpos, 0, sizeof(Float_t) * 2);
2912 Int_t iok = 0, idiff = 0;
2913 // This attempt is worse and should be avoided:
2914 // check for two chambers which are OK and repeat this without taking the mean value
2915 // Strategy avoids a division by 0;
2916 for(Int_t il = 5; il >= 0; il--){
2917 if(tracklets[il].IsOK()){
2918 xpos[iok] = tracklets[il].GetX0();
2919 iok++;
2920 startIndex = il;
2921 }
2922 if(iok) idiff++; // to get the right difference;
2923 if(iok > 1) break;
2924 }
2925 if(iok > 1){
2926 meanDistance = (xpos[0] - xpos[1])/idiff;
2927 }
2928 else{
2929 // we have do not even have 2 layers which are OK? The we do not need to fit at all
2930 return 331.;
2931 }
2932 }
2933 else{
2934 meanDistance /= nDistances;
2935 }
2936 return tracklets[startIndex].GetX0() + (2.5 - startIndex) * meanDistance - 0.5 * (AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick());
bb56afff 2937}
eb38ed55 2938
2939//_____________________________________________________________________________
2940Int_t AliTRDtrackerV1::Freq(Int_t n, const Int_t *inlist
41702fec 2941 , Int_t *outlist, Bool_t down)
eb38ed55 2942{
41702fec 2943 //
2944 // Sort eleements according occurancy
2945 // The size of output array has is 2*n
2946 //
2947
2948 if (n <= 0) {
2949 return 0;
2950 }
2951
2952 Int_t *sindexS = new Int_t[n]; // Temporary array for sorting
2953 Int_t *sindexF = new Int_t[2*n];
2954 for (Int_t i = 0; i < n; i++) {
2955 sindexF[i] = 0;
2956 }
2957
2958 TMath::Sort(n,inlist,sindexS,down);
2959
2960 Int_t last = inlist[sindexS[0]];
2961 Int_t val = last;
2962 sindexF[0] = 1;
2963 sindexF[0+n] = last;
2964 Int_t countPos = 0;
2965
2966 // Find frequency
2967 for (Int_t i = 1; i < n; i++) {
2968 val = inlist[sindexS[i]];
2969 if (last == val) {
2970 sindexF[countPos]++;
2971 }
2972 else {
2973 countPos++;
2974 sindexF[countPos+n] = val;
2975 sindexF[countPos]++;
2976 last = val;
2977 }
2978 }
2979 if (last == val) {
2980 countPos++;
2981 }
2982
2983 // Sort according frequency
2984 TMath::Sort(countPos,sindexF,sindexS,kTRUE);
2985
2986 for (Int_t i = 0; i < countPos; i++) {
2987 outlist[2*i ] = sindexF[sindexS[i]+n];
2988 outlist[2*i+1] = sindexF[sindexS[i]];
2989 }
2990
2991 delete [] sindexS;
2992 delete [] sindexF;
2993
2994 return countPos;
eb38ed55 2995
2996}
bb56afff 2997
2998//_____________________________________________________________________________
2999Float_t AliTRDtrackerV1::GetChi2Y(AliTRDseedV1 *tracklets) const
3000{
41702fec 3001 // Chi2 definition on y-direction
3002
3003 Float_t chi2 = 0;
3004 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
3005 if(!tracklets[ipl].IsOK()) continue;
3006 Double_t distLayer = tracklets[ipl].GetYfit(0) - tracklets[ipl].GetYref(0);
3007 chi2 += distLayer * distLayer;
3008 }
3009 return chi2;
bb56afff 3010}
3011
d611c74f 3012//____________________________________________________________________
3013void AliTRDtrackerV1::ResetSeedTB()
3014{
3015// reset buffer for seeding time bin layers. If the time bin
3016// layers are not allocated this function allocates them
3017
3018 for(Int_t isl=0; isl<kNSeedPlanes; isl++){
3019 if(!fSeedTB[isl]) fSeedTB[isl] = new AliTRDchamberTimeBin();
3020 else fSeedTB[isl]->Clear();
3021 }
3022}
3023
bb56afff 3024//_____________________________________________________________________________
3025Float_t AliTRDtrackerV1::GetChi2Z(AliTRDseedV1 *tracklets) const
3026{
41702fec 3027 // Chi2 definition on z-direction
3028
3029 Float_t chi2 = 0;
3030 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
3031 if(!tracklets[ipl].IsOK()) continue;
3032 Double_t distLayer = tracklets[ipl].GetMeanz() - tracklets[ipl].GetZref(0);
3033 chi2 += distLayer * distLayer;
3034 }
3035 return chi2;
bb56afff 3036}
8acca6a3 3037
3038///////////////////////////////////////////////////////
3039// //
3040// Resources of class AliTRDLeastSquare //
3041// //
3042///////////////////////////////////////////////////////
3043
3044//_____________________________________________________________________________
3045AliTRDtrackerV1::AliTRDLeastSquare::AliTRDLeastSquare(){
41702fec 3046 //
3047 // Constructor of the nested class AliTRDtrackFitterLeastSquare
3048 //
3049 memset(fParams, 0, sizeof(Double_t) * 2);
3050 memset(fSums, 0, sizeof(Double_t) * 5);
3051 memset(fCovarianceMatrix, 0, sizeof(Double_t) * 3);
8acca6a3 3052
3053}
3054
3055//_____________________________________________________________________________
3056void AliTRDtrackerV1::AliTRDLeastSquare::AddPoint(Double_t *x, Double_t y, Double_t sigmaY){
41702fec 3057 //
3058 // Adding Point to the fitter
3059 //
3060 Double_t weight = 1/(sigmaY * sigmaY);
3061 Double_t &xpt = *x;
3062 // printf("Adding point x = %f, y = %f, sigma = %f\n", xpt, y, sigmaY);
3063 fSums[0] += weight;
3064 fSums[1] += weight * xpt;
3065 fSums[2] += weight * y;
3066 fSums[3] += weight * xpt * y;
3067 fSums[4] += weight * xpt * xpt;
3068 fSums[5] += weight * y * y;
8acca6a3 3069}
3070
3071//_____________________________________________________________________________
3072void AliTRDtrackerV1::AliTRDLeastSquare::RemovePoint(Double_t *x, Double_t y, Double_t sigmaY){
41702fec 3073 //
3074 // Remove Point from the sample
3075 //
3076 Double_t weight = 1/(sigmaY * sigmaY);
3077 Double_t &xpt = *x;
3078 fSums[0] -= weight;
3079 fSums[1] -= weight * xpt;
3080 fSums[2] -= weight * y;
3081 fSums[3] -= weight * xpt * y;
3082 fSums[4] -= weight * xpt * xpt;
3083 fSums[5] -= weight * y * y;
8acca6a3 3084}
3085
3086//_____________________________________________________________________________
3087void AliTRDtrackerV1::AliTRDLeastSquare::Eval(){
41702fec 3088 //
3089 // Evaluation of the fit:
3090 // Calculation of the parameters
3091 // Calculation of the covariance matrix
3092 //
3093
3094 Double_t denominator = fSums[0] * fSums[4] - fSums[1] *fSums[1];
3095 // for(Int_t isum = 0; isum < 5; isum++)
3096 // printf("fSums[%d] = %f\n", isum, fSums[isum]);
3097 // printf("denominator = %f\n", denominator);
3098 fParams[0] = (fSums[2] * fSums[4] - fSums[1] * fSums[3])/ denominator;
3099 fParams[1] = (fSums[0] * fSums[3] - fSums[1] * fSums[2]) / denominator;
3100 // printf("fParams[0] = %f, fParams[1] = %f\n", fParams[0], fParams[1]);
3101
3102 // Covariance matrix
3103 fCovarianceMatrix[0] = fSums[4] - fSums[1] * fSums[1] / fSums[0];
3104 fCovarianceMatrix[1] = fSums[5] - fSums[2] * fSums[2] / fSums[0];
3105 fCovarianceMatrix[2] = fSums[3] - fSums[1] * fSums[2] / fSums[0];
8acca6a3 3106}
3107
46b6abd7 3108//_____________________________________________________________________________
3109Double_t AliTRDtrackerV1::AliTRDLeastSquare::GetFunctionValue(Double_t *xpos) const {
41702fec 3110 //
3111 // Returns the Function value of the fitted function at a given x-position
3112 //
3113 return fParams[0] + fParams[1] * (*xpos);
46b6abd7 3114}
3115
3116//_____________________________________________________________________________
3117void AliTRDtrackerV1::AliTRDLeastSquare::GetCovarianceMatrix(Double_t *storage) const {
41702fec 3118 //
3119 // Copies the values of the covariance matrix into the storage
3120 //
3121 memcpy(storage, fCovarianceMatrix, sizeof(Double_t) * 3);
46b6abd7 3122}
3123