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Correct reading of data file.
[u/mrichter/AliRoot.git] / TRD / AliTRDtrackerV1.cxx
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e4f2f73d 1/**************************************************************************
972ef65e 2* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
3* *
4* Author: The ALICE Off-line Project. *
5* Contributors are mentioned in the code where appropriate. *
6* *
7* Permission to use, copy, modify and distribute this software and its *
8* documentation strictly for non-commercial purposes is hereby granted *
9* without fee, provided that the above copyright notice appears in all *
10* copies and that both the copyright notice and this permission notice *
11* appear in the supporting documentation. The authors make no claims *
12* about the suitability of this software for any purpose. It is *
13* provided "as is" without express or implied warranty. *
14**************************************************************************/
e4f2f73d 15
16/* $Id$ */
17
18///////////////////////////////////////////////////////////////////////////////
19// //
20// Track finder //
21// //
22// Authors: //
23// Alex Bercuci <A.Bercuci@gsi.de> //
24// Markus Fasel <M.Fasel@gsi.de> //
25// //
26///////////////////////////////////////////////////////////////////////////////
27
bb56afff 28// #include <Riostream.h>
29// #include <stdio.h>
30// #include <string.h>
e4f2f73d 31
32#include <TBranch.h>
bb56afff 33#include <TDirectory.h>
e4f2f73d 34#include <TLinearFitter.h>
e4f2f73d 35#include <TTree.h>
36#include <TClonesArray.h>
e4f2f73d 37#include <TTreeStream.h>
38
39#include "AliLog.h"
fac58f00 40#include "AliMathBase.h"
e4f2f73d 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 77AliRieman* AliTRDtrackerV1::fgRieman = 0x0;
78TLinearFitter* AliTRDtrackerV1::fgTiltedRieman = 0x0;
79TLinearFitter* AliTRDtrackerV1::fgTiltedRiemanConstrained = 0x0;
e4f2f73d 80
81//____________________________________________________________________
3a039a31 82AliTRDtrackerV1::AliTRDtrackerV1(AliTRDReconstructor *rec)
41702fec 83 :AliTracker()
06b32d95 84 ,fReconstructor(0x0)
41702fec 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);
3a039a31 102
d611c74f 103 for(Int_t isl =0; isl<kNSeedPlanes; isl++) fSeedTB[isl] = 0x0;
d20df6fc 104
3a039a31 105 // Initialize debug stream
06b32d95 106 if(rec) SetReconstructor(rec);
eb38ed55 107}
108
e4f2f73d 109//____________________________________________________________________
110AliTRDtrackerV1::~AliTRDtrackerV1()
111{
41702fec 112 //
113 // Destructor
114 //
115
f7ab3117 116 if(fgRieman) delete fgRieman; fgRieman = 0x0;
117 if(fgTiltedRieman) delete fgTiltedRieman; fgTiltedRieman = 0x0;
118 if(fgTiltedRiemanConstrained) delete fgTiltedRiemanConstrained; fgTiltedRiemanConstrained = 0x0;
d611c74f 119 for(Int_t isl =0; isl<kNSeedPlanes; isl++) if(fSeedTB[isl]) delete fSeedTB[isl];
41702fec 120 if(fTracks) {fTracks->Delete(); delete fTracks;}
121 if(fTracklets) {fTracklets->Delete(); delete fTracklets;}
48f8adf3 122 if(fClusters) {
123 fClusters->Delete(); delete fClusters;
124 }
41702fec 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
3a039a31 146 if(!fReconstructor->GetRecoParam() ){
147 AliError("Reconstruction configuration not initialized. Call first AliTRDReconstructor::SetRecoParam().");
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
84eab75a 168 // reset position of the point before using it
169 p.SetXYZ(0., 0., 0.);
2f7514a6 170 AliTRDseedV1 *tracklet = GetTracklet(index);
171 if (!tracklet) return kFALSE;
84eab75a 172
41702fec 173 // get detector for this tracklet
84eab75a 174 Int_t idet = tracklet->GetDetector();
41702fec 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{
fac58f00 231 if(!fgRieman) fgRieman = new AliRieman(AliTRDseedV1::kNtb * 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
b1957d3c 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);
215f7116 285 track.SetReconstructor(fReconstructor);
f29f13a6 286 track.SetKink(Bool_t(seed->GetKinkIndex(0)));
41702fec 287 //Int_t lbl = seed->GetLabel();
288 //track.SetSeedLabel(lbl);
e4d4864b 289
290 // Make backup and mark entrance in the TRD
76b60503 291 seed->UpdateTrackParams(&track, AliESDtrack::kTRDin);
292 seed->UpdateTrackParams(&track, AliESDtrack::kTRDbackup);
27fbeba8 293 Float_t p4 = track.GetC(track.GetBz());
ae3fbe1f 294 expectedClr = FollowBackProlongation(track);
295
296 if (expectedClr<0) continue; // Back prolongation failed
297
298 if(expectedClr){
d611c74f 299 found++;
41702fec 300 // computes PID for track
301 track.CookPID();
302 // update calibration references using this track
303 if(calibra->GetHisto2d()) calibra->UpdateHistogramsV1(&track);
304 // save calibration object
224f357f 305 if (fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 0 /*&& quality TODO*/){
306 AliTRDtrackV1 *calibTrack = new AliTRDtrackV1(track);
307 calibTrack->SetOwner();
308 seed->AddCalibObject(calibTrack);
309 }
310 //update ESD track
41702fec 311 if ((track.GetNumberOfClusters() > 15) && (track.GetNumberOfClusters() > 0.5*expectedClr)) {
2389e96f 312 seed->UpdateTrackParams(&track, AliESDtrack::kTRDout);
41702fec 313 track.UpdateESDtrack(seed);
41702fec 314 }
315 }
316
27fbeba8 317 if ((TMath::Abs(track.GetC(track.GetBz()) - p4) / TMath::Abs(p4) < 0.2) ||(track.Pt() > 0.8)) {
e3cf3d02 318
41702fec 319 // Make backup for back propagation
41702fec 320 Int_t foundClr = track.GetNumberOfClusters();
321 if (foundClr >= foundMin) {
41702fec 322 track.CookLabel(1. - fgkLabelFraction);
f29f13a6 323 //if(track.GetBackupTrack()) UseClusters(track.GetBackupTrack());
41702fec 324
325 // Sign only gold tracks
326 if (track.GetChi2() / track.GetNumberOfClusters() < 4) {
f29f13a6 327 //if ((seed->GetKinkIndex(0) == 0) && (track.Pt() < 1.5)) UseClusters(&track);
41702fec 328 }
329 Bool_t isGold = kFALSE;
330
331 // Full gold track
332 if (track.GetChi2() / track.GetNumberOfClusters() < 5) {
333 if (track.GetBackupTrack()) seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup);
334
335 isGold = kTRUE;
336 }
337
338 // Almost gold track
339 if ((!isGold) && (track.GetNCross() == 0) && (track.GetChi2() / track.GetNumberOfClusters() < 7)) {
340 //seed->UpdateTrackParams(track, AliESDtrack::kTRDbackup);
341 if (track.GetBackupTrack()) seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup);
342
343 isGold = kTRUE;
344 }
345
346 if ((!isGold) && (track.GetBackupTrack())) {
347 if ((track.GetBackupTrack()->GetNumberOfClusters() > foundMin) && ((track.GetBackupTrack()->GetChi2()/(track.GetBackupTrack()->GetNumberOfClusters()+1)) < 7)) {
348 seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup);
349 isGold = kTRUE;
350 }
351 }
352
353 //if ((track->StatusForTOF() > 0) && (track->GetNCross() == 0) && (Float_t(track->GetNumberOfClusters()) / Float_t(track->GetNExpected()) > 0.4)) {
354 //seed->UpdateTrackParams(track->GetBackupTrack(), AliESDtrack::kTRDbackup);
355 //}
356 }
357 }
358
359 // Propagation to the TOF (I.Belikov)
360 if (track.IsStopped() == kFALSE) {
361 Double_t xtof = 371.0;
362 Double_t xTOF0 = 370.0;
363
27fbeba8 364 Double_t c2 = track.GetSnp() + track.GetC(track.GetBz()) * (xtof - track.GetX());
41702fec 365 if (TMath::Abs(c2) >= 0.99) continue;
366
ae3fbe1f 367 if (!PropagateToX(track, xTOF0, fgkMaxStep)) continue;
41702fec 368
369 // Energy losses taken to the account - check one more time
27fbeba8 370 c2 = track.GetSnp() + track.GetC(track.GetBz()) * (xtof - track.GetX());
41702fec 371 if (TMath::Abs(c2) >= 0.99) continue;
372
373 //if (!PropagateToX(*track,xTOF0,fgkMaxStep)) {
374 // fHBackfit->Fill(7);
375 //delete track;
376 // continue;
377 //}
378
379 Double_t ymax = xtof * TMath::Tan(0.5 * AliTRDgeometry::GetAlpha());
380 Double_t y;
381 track.GetYAt(xtof,GetBz(),y);
382 if (y > ymax) {
383 if (!track.Rotate( AliTRDgeometry::GetAlpha())) continue;
384 }else if (y < -ymax) {
385 if (!track.Rotate(-AliTRDgeometry::GetAlpha())) continue;
386 }
387
388 if (track.PropagateTo(xtof)) {
389 seed->UpdateTrackParams(&track, AliESDtrack::kTRDout);
390 track.UpdateESDtrack(seed);
41702fec 391 }
392 } else {
393 if ((track.GetNumberOfClusters() > 15) && (track.GetNumberOfClusters() > 0.5*expectedClr)) {
394 seed->UpdateTrackParams(&track, AliESDtrack::kTRDout);
395
396 track.UpdateESDtrack(seed);
41702fec 397 }
398 }
399
400 seed->SetTRDQuality(track.StatusForTOF());
401 seed->SetTRDBudget(track.GetBudget(0));
402 }
d611c74f 403 if(index) delete [] index;
404 if(quality) delete [] quality;
41702fec 405
406
ed15ef4f 407 AliInfo(Form("Number of TPC seeds: %d", nSeed));
41702fec 408 AliInfo(Form("Number of back propagated TRD tracks: %d", found));
409
d611c74f 410 // run stand alone tracking
3a039a31 411 if (fReconstructor->IsSeeding()) Clusters2Tracks(event);
41702fec 412
413 return 0;
0906e73e 414}
415
416
417//____________________________________________________________________
418Int_t AliTRDtrackerV1::RefitInward(AliESDEvent *event)
419{
41702fec 420 //
421 // Refits tracks within the TRD. The ESD event is expected to contain seeds
422 // at the outer part of the TRD.
423 // The tracks are propagated to the innermost time bin
424 // of the TRD and the ESD event is updated
425 // Origin: Thomas KUHR (Thomas.Kuhr@cern.ch)
426 //
427
428 Int_t nseed = 0; // contor for loaded seeds
429 Int_t found = 0; // contor for updated TRD tracks
430
431
432 AliTRDtrackV1 track;
433 for (Int_t itrack = 0; itrack < event->GetNumberOfTracks(); itrack++) {
434 AliESDtrack *seed = event->GetTrack(itrack);
435 new(&track) AliTRDtrackV1(*seed);
436
437 if (track.GetX() < 270.0) {
438 seed->UpdateTrackParams(&track, AliESDtrack::kTRDbackup);
439 continue;
440 }
441
e3cf3d02 442 // reject tracks which failed propagation in the TRD or
443 // are produced by the TRD stand alone tracker
41702fec 444 ULong_t status = seed->GetStatus();
e3cf3d02 445 if(!(status & AliESDtrack::kTRDout)) continue;
446 if(!(status & AliESDtrack::kTRDin)) continue;
41702fec 447 nseed++;
448
449 track.ResetCovariance(50.0);
450
451 // do the propagation and processing
452 Bool_t kUPDATE = kFALSE;
453 Double_t xTPC = 250.0;
454 if(FollowProlongation(track)){
455 // Prolongate to TPC
456 if (PropagateToX(track, xTPC, fgkMaxStep)) { // -with update
e3cf3d02 457 seed->UpdateTrackParams(&track, AliESDtrack::kTRDrefit);
458 found++;
459 kUPDATE = kTRUE;
460 }
461
462 // Update the friend track
463 if (fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 0){
464 TObject *o = 0x0; Int_t ic = 0;
465 AliTRDtrackV1 *calibTrack = 0x0;
466 while((o = seed->GetCalibObject(ic++))){
467 if(!(calibTrack = dynamic_cast<AliTRDtrackV1*>(o))) continue;
468 calibTrack->SetTrackHigh(track.GetTrackHigh());
469 }
41702fec 470 }
e3cf3d02 471 }
41702fec 472
473 // Prolongate to TPC without update
474 if(!kUPDATE) {
475 AliTRDtrackV1 tt(*seed);
e3cf3d02 476 if (PropagateToX(tt, xTPC, fgkMaxStep)) seed->UpdateTrackParams(&tt, AliESDtrack::kTRDbackup);
41702fec 477 }
478 }
479 AliInfo(Form("Number of loaded seeds: %d",nseed));
480 AliInfo(Form("Number of found tracks from loaded seeds: %d",found));
481
482 return 0;
0906e73e 483}
484
0906e73e 485//____________________________________________________________________
486Int_t AliTRDtrackerV1::FollowProlongation(AliTRDtrackV1 &t)
487{
41702fec 488 // Extrapolates the TRD track in the TPC direction.
489 //
490 // Parameters
491 // t : the TRD track which has to be extrapolated
492 //
493 // Output
494 // number of clusters attached to the track
495 //
496 // Detailed description
497 //
498 // Starting from current radial position of track <t> this function
499 // extrapolates the track through the 6 TRD layers. The following steps
500 // are being performed for each plane:
501 // 1. prepare track:
502 // a. get plane limits in the local x direction
503 // b. check crossing sectors
504 // c. check track inclination
505 // 2. search tracklet in the tracker list (see GetTracklet() for details)
506 // 3. evaluate material budget using the geo manager
507 // 4. propagate and update track using the tracklet information.
508 //
509 // Debug level 2
510 //
511
e3cf3d02 512 Bool_t kStoreIn = kTRUE;
41702fec 513 Int_t nClustersExpected = 0;
e3cf3d02 514 for (Int_t iplane = kNPlanes; iplane--;) {
41702fec 515 Int_t index = 0;
516 AliTRDseedV1 *tracklet = GetTracklet(&t, iplane, index);
517 if(!tracklet) continue;
518 if(!tracklet->IsOK()) AliWarning("tracklet not OK");
519
e3cf3d02 520 Double_t x = tracklet->GetX();//GetX0();
41702fec 521 // reject tracklets which are not considered for inward refit
522 if(x > t.GetX()+fgkMaxStep) continue;
523
524 // append tracklet to track
525 t.SetTracklet(tracklet, index);
526
527 if (x < (t.GetX()-fgkMaxStep) && !PropagateToX(t, x+fgkMaxStep, fgkMaxStep)) break;
528 if (!AdjustSector(&t)) break;
529
530 // Start global position
531 Double_t xyz0[3];
532 t.GetXYZ(xyz0);
533
534 // End global position
535 Double_t alpha = t.GetAlpha(), y, z;
536 if (!t.GetProlongation(x,y,z)) break;
537 Double_t xyz1[3];
538 xyz1[0] = x * TMath::Cos(alpha) - y * TMath::Sin(alpha);
539 xyz1[1] = x * TMath::Sin(alpha) + y * TMath::Cos(alpha);
540 xyz1[2] = z;
541
51a23065 542 Double_t length = TMath::Sqrt(
543 (xyz0[0]-xyz1[0])*(xyz0[0]-xyz1[0]) +
544 (xyz0[1]-xyz1[1])*(xyz0[1]-xyz1[1]) +
545 (xyz0[2]-xyz1[2])*(xyz0[2]-xyz1[2])
546 );
547 if(length>0.){
548 // Get material budget
549 Double_t param[7];
550 if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param)<=0.) break;
551 Double_t xrho= param[0]*param[4];
552 Double_t xx0 = param[1]; // Get mean propagation parameters
553
554 // Propagate and update
555 t.PropagateTo(x, xx0, xrho);
556 if (!AdjustSector(&t)) break;
557 }
e3cf3d02 558 if(kStoreIn){
559 t.SetTrackHigh();
560 kStoreIn = kFALSE;
561 }
562
41702fec 563 Double_t maxChi2 = t.GetPredictedChi2(tracklet);
564 if (maxChi2 < 1e+10 && t.Update(tracklet, maxChi2)){
565 nClustersExpected += tracklet->GetN();
566 }
567 }
568
3a039a31 569 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){
41702fec 570 Int_t index;
51a23065 571 for(int iplane=0; iplane<AliTRDgeometry::kNlayer; iplane++){
41702fec 572 AliTRDseedV1 *tracklet = GetTracklet(&t, iplane, index);
573 if(!tracklet) continue;
574 t.SetTracklet(tracklet, index);
575 }
576
577 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
29f95561 578 TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
41702fec 579 cstreamer << "FollowProlongation"
580 << "EventNumber=" << eventNumber
581 << "ncl=" << nClustersExpected
582 //<< "track.=" << &t
583 << "\n";
584 }
585
586 return nClustersExpected;
0906e73e 587
588}
589
590//_____________________________________________________________________________
591Int_t AliTRDtrackerV1::FollowBackProlongation(AliTRDtrackV1 &t)
592{
41702fec 593 // Extrapolates the TRD track in the TOF direction.
594 //
595 // Parameters
596 // t : the TRD track which has to be extrapolated
597 //
598 // Output
599 // number of clusters attached to the track
600 //
601 // Detailed description
602 //
603 // Starting from current radial position of track <t> this function
604 // extrapolates the track through the 6 TRD layers. The following steps
605 // are being performed for each plane:
606 // 1. prepare track:
607 // a. get plane limits in the local x direction
608 // b. check crossing sectors
609 // c. check track inclination
610 // 2. build tracklet (see AliTRDseed::AttachClusters() for details)
611 // 3. evaluate material budget using the geo manager
612 // 4. propagate and update track using the tracklet information.
613 //
614 // Debug level 2
615 //
616
617 Int_t nClustersExpected = 0;
b1957d3c 618 Double_t clength = .5*AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick();
41702fec 619 AliTRDtrackingChamber *chamber = 0x0;
620
3b57a3f7 621 AliTRDseedV1 tracklet, *ptrTracklet = 0x0;
181d2c97 622 // in case of stand alone tracking we store all the pointers to the tracklets in a temporary array
623 AliTRDseedV1 *tracklets[kNPlanes];
624 memset(tracklets, 0, sizeof(AliTRDseedV1 *) * kNPlanes);
625 for(Int_t ip = 0; ip < kNPlanes; ip++){
626 tracklets[ip] = t.GetTracklet(ip);
627 t.UnsetTracklet(ip);
628 }
e3cf3d02 629 Bool_t kStoreIn = kTRUE;
630
3b57a3f7 631
053767a4 632 // Loop through the TRD layers
e3cf3d02 633 for (Int_t ilayer = 0; ilayer < kNPlanes; ilayer++) {
41702fec 634 // BUILD TRACKLET IF NOT ALREADY BUILT
b1957d3c 635 Double_t x = 0., x0, y, z, alpha;
181d2c97 636 ptrTracklet = tracklets[ilayer];
41702fec 637 if(!ptrTracklet){
053767a4 638 ptrTracklet = new(&tracklet) AliTRDseedV1(ilayer);
43d6ad34 639 ptrTracklet->SetReconstructor(fReconstructor);
f29f13a6 640 ptrTracklet->SetKink(t.IsKink());
41702fec 641 alpha = t.GetAlpha();
053767a4 642 Int_t sector = Int_t(alpha/AliTRDgeometry::GetAlpha() + (alpha>0. ? 0 : AliTRDgeometry::kNsector));
41702fec 643
644 if(!fTrSec[sector].GetNChambers()) continue;
645
053767a4 646 if((x = fTrSec[sector].GetX(ilayer)) < 1.) continue;
41702fec 647
b1957d3c 648 // Propagate closer to the current layer
649 x0 = x - 1.5*clength;
650 if (x0 > (fgkMaxStep + t.GetX()) && !PropagateToX(t, x0-fgkMaxStep, fgkMaxStep)) return -1/*nClustersExpected*/;
651 if (!AdjustSector(&t)) return -1/*nClustersExpected*/;
652 if (TMath::Abs(t.GetSnp()) > fgkMaxSnp) return -1/*nClustersExpected*/;
653
35c24814 654 if (!t.GetProlongation(x, y, z)) return -1/*nClustersExpected*/;
053767a4 655 Int_t stack = fGeom->GetStack(z, ilayer);
41702fec 656 Int_t nCandidates = stack >= 0 ? 1 : 2;
657 z -= stack >= 0 ? 0. : 4.;
658
659 for(int icham=0; icham<nCandidates; icham++, z+=8){
053767a4 660 if((stack = fGeom->GetStack(z, ilayer)) < 0) continue;
41702fec 661
053767a4 662 if(!(chamber = fTrSec[sector].GetChamber(stack, ilayer))) continue;
41702fec 663
3a039a31 664 if(chamber->GetNClusters() < fgNTimeBins*fReconstructor->GetRecoParam() ->GetFindableClusters()) continue;
41702fec 665
666 x = chamber->GetX();
667
053767a4 668 AliTRDpadPlane *pp = fGeom->GetPadPlane(ilayer, stack);
aec26713 669 tracklet.SetTilt(TMath::Tan(TMath::DegToRad()*pp->GetTiltingAngle()));
41702fec 670 tracklet.SetPadLength(pp->GetLengthIPad());
dd8059a8 671 tracklet.SetPadWidth(pp->GetWidthIPad());
ae4e8b84 672 tracklet.SetDetector(chamber->GetDetector());
41702fec 673 tracklet.SetX0(x);
b1957d3c 674 tracklet.UpDate(&t);
675// if(!tracklet.Init(&t)){
676// t.SetStopped(kTRUE);
677// return nClustersExpected;
678// }
679 if(!tracklet.AttachClusters(chamber, kTRUE)) continue;
680 //if(!tracklet.AttachClustersIter(chamber, 1000.)) continue;
681 //tracklet.Init(&t);
41702fec 682
3a039a31 683 if(tracklet.GetN() < fgNTimeBins*fReconstructor->GetRecoParam() ->GetFindableClusters()) continue;
41702fec 684
685 break;
686 }
f29f13a6 687 ptrTracklet->UpdateUsed();
688 }
41702fec 689 if(!ptrTracklet->IsOK()){
f29f13a6 690 ptrTracklet->Reset();
41702fec 691 if(x < 1.) continue; //temporary
35c24814 692 if(!PropagateToX(t, x-fgkMaxStep, fgkMaxStep)) return -1/*nClustersExpected*/;
693 if(!AdjustSector(&t)) return -1/*nClustersExpected*/;
694 if(TMath::Abs(t.GetSnp()) > fgkMaxSnp) return -1/*nClustersExpected*/;
41702fec 695 continue;
696 }
697
698 // Propagate closer to the current chamber if neccessary
699 x -= clength;
35c24814 700 if (x > (fgkMaxStep + t.GetX()) && !PropagateToX(t, x-fgkMaxStep, fgkMaxStep)) return -1/*nClustersExpected*/;
701 if (!AdjustSector(&t)) return -1/*nClustersExpected*/;
702 if (TMath::Abs(t.GetSnp()) > fgkMaxSnp) return -1/*nClustersExpected*/;
41702fec 703
704 // load tracklet to the tracker and the track
f29f13a6 705 ptrTracklet->UseClusters();
b1957d3c 706 ptrTracklet->Fit(kFALSE); // no tilt correction
41702fec 707 ptrTracklet = SetTracklet(ptrTracklet);
708 t.SetTracklet(ptrTracklet, fTracklets->GetEntriesFast()-1);
709
710
711 // Calculate the mean material budget along the path inside the chamber
712 //Calculate global entry and exit positions of the track in chamber (only track prolongation)
713 Double_t xyz0[3]; // entry point
714 t.GetXYZ(xyz0);
715 alpha = t.GetAlpha();
e3cf3d02 716 x = ptrTracklet->GetX(); //GetX0();
35c24814 717 if (!t.GetProlongation(x, y, z)) return -1/*nClustersExpected*/;
41702fec 718 Double_t xyz1[3]; // exit point
719 xyz1[0] = x * TMath::Cos(alpha) - y * TMath::Sin(alpha);
720 xyz1[1] = +x * TMath::Sin(alpha) + y * TMath::Cos(alpha);
721 xyz1[2] = z;
722 Double_t param[7];
83dea92e 723 if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param)<=0.) return -1;
41702fec 724 // The mean propagation parameters
725 Double_t xrho = param[0]*param[4]; // density*length
726 Double_t xx0 = param[1]; // radiation length
727
728 // Propagate and update track
35c24814 729 if (!t.PropagateTo(x, xx0, xrho)) return -1/*nClustersExpected*/;
730 if (!AdjustSector(&t)) return -1/*nClustersExpected*/;
e3cf3d02 731
732 if(kStoreIn){
733 t.SetTrackLow();
734 kStoreIn = kFALSE;
735 }
41702fec 736 Double_t maxChi2 = t.GetPredictedChi2(ptrTracklet);
35c24814 737 if (!t.Update(ptrTracklet, maxChi2)) return -1/*nClustersExpected*/;
b1957d3c 738 ptrTracklet->UpDate(&t);
739
ae3fbe1f 740 if (maxChi2<1e+10) {
41702fec 741 nClustersExpected += ptrTracklet->GetN();
742 //t.SetTracklet(&tracklet, index);
743 }
744 // Reset material budget if 2 consecutive gold
053767a4 745 if(ilayer>0 && t.GetTracklet(ilayer-1) && ptrTracklet->GetN() + t.GetTracklet(ilayer-1)->GetN() > 20) t.SetBudget(2, 0.);
41702fec 746
747 // Make backup of the track until is gold
748 // TO DO update quality check of the track.
749 // consider comparison with fTimeBinsRange
750 Float_t ratio0 = ptrTracklet->GetN() / Float_t(fgNTimeBins);
751 //Float_t ratio1 = Float_t(t.GetNumberOfClusters()+1) / Float_t(t.GetNExpected()+1);
752 //printf("tracklet.GetChi2() %f [< 18.0]\n", tracklet.GetChi2());
753 //printf("ratio0 %f [> 0.8]\n", ratio0);
754 //printf("ratio1 %f [> 0.6]\n", ratio1);
755 //printf("ratio0+ratio1 %f [> 1.5]\n", ratio0+ratio1);
756 //printf("t.GetNCross() %d [== 0]\n", t.GetNCross());
757 //printf("TMath::Abs(t.GetSnp()) %f [< 0.85]\n", TMath::Abs(t.GetSnp()));
758 //printf("t.GetNumberOfClusters() %d [> 20]\n", t.GetNumberOfClusters());
759
760 if (//(tracklet.GetChi2() < 18.0) && TO DO check with FindClusters and move it to AliTRDseed::Update
761 (ratio0 > 0.8) &&
762 //(ratio1 > 0.6) &&
763 //(ratio0+ratio1 > 1.5) &&
764 (t.GetNCross() == 0) &&
765 (TMath::Abs(t.GetSnp()) < 0.85) &&
e3cf3d02 766 (t.GetNumberOfClusters() > 20)){
767 t.MakeBackupTrack();
768 }
053767a4 769 } // end layers loop
41702fec 770
3a039a31 771 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){
29f95561 772 TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
41702fec 773 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
774 //AliTRDtrackV1 *debugTrack = new AliTRDtrackV1(t);
775 //debugTrack->SetOwner();
776 cstreamer << "FollowBackProlongation"
777 << "EventNumber=" << eventNumber
778 << "ncl=" << nClustersExpected
779 //<< "track.=" << debugTrack
780 << "\n";
781 }
782
783 return nClustersExpected;
0906e73e 784}
785
eb38ed55 786//_________________________________________________________________________
787Float_t AliTRDtrackerV1::FitRieman(AliTRDseedV1 *tracklets, Double_t *chi2, Int_t *planes){
41702fec 788 //
789 // Fits a Riemann-circle to the given points without tilting pad correction.
790 // The fit is performed using an instance of the class AliRieman (equations
791 // and transformations see documentation of this class)
792 // Afterwards all the tracklets are Updated
793 //
794 // Parameters: - Array of tracklets (AliTRDseedV1)
795 // - Storage for the chi2 values (beginning with direction z)
796 // - Seeding configuration
797 // Output: - The curvature
798 //
799 AliRieman *fitter = AliTRDtrackerV1::GetRiemanFitter();
800 fitter->Reset();
801 Int_t allplanes[] = {0, 1, 2, 3, 4, 5};
802 Int_t *ppl = &allplanes[0];
803 Int_t maxLayers = 6;
804 if(planes){
805 maxLayers = 4;
806 ppl = planes;
807 }
808 for(Int_t il = 0; il < maxLayers; il++){
809 if(!tracklets[ppl[il]].IsOK()) continue;
e3cf3d02 810 fitter->AddPoint(tracklets[ppl[il]].GetX0(), tracklets[ppl[il]].GetYfit(0), tracklets[ppl[il]].GetZfit(0),1,10);
41702fec 811 }
812 fitter->Update();
813 // Set the reference position of the fit and calculate the chi2 values
814 memset(chi2, 0, sizeof(Double_t) * 2);
815 for(Int_t il = 0; il < maxLayers; il++){
816 // Reference positions
817 tracklets[ppl[il]].Init(fitter);
818
819 // chi2
820 if((!tracklets[ppl[il]].IsOK()) && (!planes)) continue;
821 chi2[0] += tracklets[ppl[il]].GetChi2Y();
822 chi2[1] += tracklets[ppl[il]].GetChi2Z();
823 }
824 return fitter->GetC();
eb38ed55 825}
826
827//_________________________________________________________________________
828void AliTRDtrackerV1::FitRieman(AliTRDcluster **seedcl, Double_t chi2[2])
829{
41702fec 830 //
831 // Performs a Riemann helix fit using the seedclusters as spacepoints
832 // Afterwards the chi2 values are calculated and the seeds are updated
833 //
834 // Parameters: - The four seedclusters
835 // - The tracklet array (AliTRDseedV1)
836 // - The seeding configuration
837 // - Chi2 array
838 //
839 // debug level 2
840 //
841 AliRieman *fitter = AliTRDtrackerV1::GetRiemanFitter();
842 fitter->Reset();
843 for(Int_t i = 0; i < 4; i++)
844 fitter->AddPoint(seedcl[i]->GetX(), seedcl[i]->GetY(), seedcl[i]->GetZ(), 1, 10);
845 fitter->Update();
846
847
848 // Update the seed and calculated the chi2 value
849 chi2[0] = 0; chi2[1] = 0;
850 for(Int_t ipl = 0; ipl < kNSeedPlanes; ipl++){
851 // chi2
852 chi2[0] += (seedcl[ipl]->GetZ() - fitter->GetZat(seedcl[ipl]->GetX())) * (seedcl[ipl]->GetZ() - fitter->GetZat(seedcl[ipl]->GetX()));
853 chi2[1] += (seedcl[ipl]->GetY() - fitter->GetYat(seedcl[ipl]->GetX())) * (seedcl[ipl]->GetY() - fitter->GetYat(seedcl[ipl]->GetX()));
854 }
eb38ed55 855}
856
857
858//_________________________________________________________________________
859Float_t AliTRDtrackerV1::FitTiltedRiemanConstraint(AliTRDseedV1 *tracklets, Double_t zVertex)
860{
41702fec 861 //
862 // Fits a helix to the clusters. Pad tilting is considered. As constraint it is
863 // assumed that the vertex position is set to 0.
864 // This method is very usefull for high-pt particles
865 // Basis for the fit: (x - x0)^2 + (y - y0)^2 - R^2 = 0
866 // x0, y0: Center of the circle
867 // Measured y-position: ymeas = y - tan(phiT)(zc - zt)
868 // zc: center of the pad row
869 // Equation which has to be fitted (after transformation):
870 // a + b * u + e * v + 2*(ymeas + tan(phiT)(z - zVertex))*t = 0
871 // Transformation:
872 // t = 1/(x^2 + y^2)
873 // u = 2 * x * t
874 // v = 2 * x * tan(phiT) * t
875 // Parameters in the equation:
876 // a = -1/y0, b = x0/y0, e = dz/dx
877 //
878 // The Curvature is calculated by the following equation:
879 // - curv = a/Sqrt(b^2 + 1) = 1/R
880 // Parameters: - the 6 tracklets
881 // - the Vertex constraint
882 // Output: - the Chi2 value of the track
883 //
884 // debug level 5
885 //
886
887 TLinearFitter *fitter = GetTiltedRiemanFitterConstraint();
888 fitter->StoreData(kTRUE);
889 fitter->ClearPoints();
890 AliTRDcluster *cl = 0x0;
891
892 Float_t x, y, z, w, t, error, tilt;
893 Double_t uvt[2];
894 Int_t nPoints = 0;
053767a4 895 for(Int_t ilr = 0; ilr < AliTRDgeometry::kNlayer; ilr++){
896 if(!tracklets[ilr].IsOK()) continue;
8d2bec9e 897 for(Int_t itb = 0; itb < AliTRDseedV1::kNclusters; itb++){
053767a4 898 if(!tracklets[ilr].IsUsable(itb)) continue;
899 cl = tracklets[ilr].GetClusters(itb);
41702fec 900 x = cl->GetX();
901 y = cl->GetY();
902 z = cl->GetZ();
053767a4 903 tilt = tracklets[ilr].GetTilt();
41702fec 904 // Transformation
905 t = 1./(x * x + y * y);
906 uvt[0] = 2. * x * t;
907 uvt[1] = 2. * x * t * tilt ;
908 w = 2. * (y + tilt * (z - zVertex)) * t;
f29f13a6 909 error = 2. * TMath::Sqrt(cl->GetSigmaY2()) * t;
41702fec 910 fitter->AddPoint(uvt, w, error);
911 nPoints++;
912 }
913 }
914 fitter->Eval();
915
916 // Calculate curvature
917 Double_t a = fitter->GetParameter(0);
918 Double_t b = fitter->GetParameter(1);
919 Double_t curvature = a/TMath::Sqrt(b*b + 1);
920
921 Float_t chi2track = fitter->GetChisquare()/Double_t(nPoints);
922 for(Int_t ip = 0; ip < AliTRDtrackerV1::kNPlanes; ip++)
e3cf3d02 923 tracklets[ip].SetC(curvature);
41702fec 924
3a039a31 925/* if(fReconstructor->GetStreamLevel() >= 5){
41702fec 926 //Linear Model on z-direction
927 Double_t xref = CalculateReferenceX(tracklets); // Relative to the middle of the stack
928 Double_t slope = fitter->GetParameter(2);
929 Double_t zref = slope * xref;
930 Float_t chi2Z = CalculateChi2Z(tracklets, zref, slope, xref);
931 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
932 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
29f95561 933 TTreeSRedirector &treeStreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
41702fec 934 treeStreamer << "FitTiltedRiemanConstraint"
935 << "EventNumber=" << eventNumber
936 << "CandidateNumber=" << candidateNumber
937 << "Curvature=" << curvature
938 << "Chi2Track=" << chi2track
939 << "Chi2Z=" << chi2Z
940 << "zref=" << zref
941 << "\n";
3a039a31 942 }*/
41702fec 943 return chi2track;
eb38ed55 944}
945
946//_________________________________________________________________________
947Float_t AliTRDtrackerV1::FitTiltedRieman(AliTRDseedV1 *tracklets, Bool_t sigError)
948{
41702fec 949 //
950 // Performs a Riemann fit taking tilting pad correction into account
951 // The equation of a Riemann circle, where the y position is substituted by the
952 // measured y-position taking pad tilting into account, has to be transformed
953 // into a 4-dimensional hyperplane equation
954 // Riemann circle: (x-x0)^2 + (y-y0)^2 -R^2 = 0
955 // Measured y-Position: ymeas = y - tan(phiT)(zc - zt)
956 // zc: center of the pad row
957 // zt: z-position of the track
958 // The z-position of the track is assumed to be linear dependent on the x-position
959 // Transformed equation: a + b * u + c * t + d * v + e * w - 2 * (ymeas + tan(phiT) * zc) * t = 0
960 // Transformation: u = 2 * x * t
961 // v = 2 * tan(phiT) * t
962 // w = 2 * tan(phiT) * (x - xref) * t
963 // t = 1 / (x^2 + ymeas^2)
964 // Parameters: a = -1/y0
965 // b = x0/y0
966 // c = (R^2 -x0^2 - y0^2)/y0
967 // d = offset
968 // e = dz/dx
969 // If the offset respectively the slope in z-position is impossible, the parameters are fixed using
970 // results from the simple riemann fit. Afterwards the fit is redone.
971 // The curvature is calculated according to the formula:
972 // curv = a/(1 + b^2 + c*a) = 1/R
973 //
974 // Paramters: - Array of tracklets (connected to the track candidate)
975 // - Flag selecting the error definition
976 // Output: - Chi2 values of the track (in Parameter list)
977 //
978 TLinearFitter *fitter = GetTiltedRiemanFitter();
979 fitter->StoreData(kTRUE);
980 fitter->ClearPoints();
981 AliTRDLeastSquare zfitter;
982 AliTRDcluster *cl = 0x0;
983
984 Double_t xref = CalculateReferenceX(tracklets);
985 Double_t x, y, z, t, tilt, dx, w, we;
986 Double_t uvt[4];
987 Int_t nPoints = 0;
988 // Containers for Least-square fitter
989 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
990 if(!tracklets[ipl].IsOK()) continue;
ed15ef4f 991 tilt = tracklets[ipl].GetTilt();
8d2bec9e 992 for(Int_t itb = 0; itb < AliTRDseedV1::kNclusters; itb++){
41702fec 993 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
994 if (!tracklets[ipl].IsUsable(itb)) continue;
995 x = cl->GetX();
996 y = cl->GetY();
997 z = cl->GetZ();
41702fec 998 dx = x - xref;
999 // Transformation
1000 t = 1./(x*x + y*y);
1001 uvt[0] = 2. * x * t;
1002 uvt[1] = t;
1003 uvt[2] = 2. * tilt * t;
1004 uvt[3] = 2. * tilt * dx * t;
1005 w = 2. * (y + tilt*z) * t;
1006 // error definition changes for the different calls
1007 we = 2. * t;
f29f13a6 1008 we *= sigError ? TMath::Sqrt(cl->GetSigmaY2()) : 0.2;
41702fec 1009 fitter->AddPoint(uvt, w, we);
1010 zfitter.AddPoint(&x, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
1011 nPoints++;
1012 }
1013 }
1014 fitter->Eval();
1015 zfitter.Eval();
1016
1017 Double_t offset = fitter->GetParameter(3);
1018 Double_t slope = fitter->GetParameter(4);
1019
1020 // Linear fitter - not possible to make boundaries
1021 // Do not accept non possible z and dzdx combinations
1022 Bool_t acceptablez = kTRUE;
1023 Double_t zref = 0.0;
1024 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
1025 if(!tracklets[iLayer].IsOK()) continue;
1026 zref = offset + slope * (tracklets[iLayer].GetX0() - xref);
e3cf3d02 1027 if (TMath::Abs(tracklets[iLayer].GetZfit(0) - zref) > tracklets[iLayer].GetPadLength() * 0.5 + 1.0)
41702fec 1028 acceptablez = kFALSE;
1029 }
1030 if (!acceptablez) {
1031 Double_t dzmf = zfitter.GetFunctionParameter(1);
1032 Double_t zmf = zfitter.GetFunctionValue(&xref);
1033 fgTiltedRieman->FixParameter(3, zmf);
1034 fgTiltedRieman->FixParameter(4, dzmf);
1035 fitter->Eval();
1036 fitter->ReleaseParameter(3);
1037 fitter->ReleaseParameter(4);
1038 offset = fitter->GetParameter(3);
1039 slope = fitter->GetParameter(4);
1040 }
1041
1042 // Calculate Curvarture
1043 Double_t a = fitter->GetParameter(0);
1044 Double_t b = fitter->GetParameter(1);
1045 Double_t c = fitter->GetParameter(2);
1046 Double_t curvature = 1.0 + b*b - c*a;
1047 if (curvature > 0.0)
1048 curvature = a / TMath::Sqrt(curvature);
1049
1050 Double_t chi2track = fitter->GetChisquare()/Double_t(nPoints);
1051
1052 // Update the tracklets
1053 Double_t dy, dz;
1054 for(Int_t iLayer = 0; iLayer < AliTRDtrackerV1::kNPlanes; iLayer++) {
1055
1056 x = tracklets[iLayer].GetX0();
1057 y = 0;
1058 z = 0;
1059 dy = 0;
1060 dz = 0;
1061
1062 // y: R^2 = (x - x0)^2 + (y - y0)^2
1063 // => y = y0 +/- Sqrt(R^2 - (x - x0)^2)
1064 // R = Sqrt() = 1/Curvature
1065 // => y = y0 +/- Sqrt(1/Curvature^2 - (x - x0)^2)
1066 Double_t res = (x * a + b); // = (x - x0)/y0
1067 res *= res;
1068 res = 1.0 - c * a + b * b - res; // = (R^2 - (x - x0)^2)/y0^2
1069 if (res >= 0) {
1070 res = TMath::Sqrt(res);
1071 y = (1.0 - res) / a;
1072 }
1073
1074 // dy: R^2 = (x - x0)^2 + (y - y0)^2
1075 // => y = +/- Sqrt(R^2 - (x - x0)^2) + y0
1076 // => dy/dx = (x - x0)/Sqrt(R^2 - (x - x0)^2)
1077 // Curvature: cr = 1/R = a/Sqrt(1 + b^2 - c*a)
1078 // => dy/dx = (x - x0)/(1/(cr^2) - (x - x0)^2)
1079 Double_t x0 = -b / a;
1080 if (-c * a + b * b + 1 > 0) {
1081 if (1.0/(curvature * curvature) - (x - x0) * (x - x0) > 0.0) {
1082 Double_t yderiv = (x - x0) / TMath::Sqrt(1.0/(curvature * curvature) - (x - x0) * (x - x0));
1083 if (a < 0) yderiv *= -1.0;
1084 dy = yderiv;
1085 }
1086 }
1087 z = offset + slope * (x - xref);
1088 dz = slope;
1089 tracklets[iLayer].SetYref(0, y);
1090 tracklets[iLayer].SetYref(1, dy);
1091 tracklets[iLayer].SetZref(0, z);
1092 tracklets[iLayer].SetZref(1, dz);
1093 tracklets[iLayer].SetC(curvature);
1094 tracklets[iLayer].SetChi2(chi2track);
1095 }
1096
3a039a31 1097/* if(fReconstructor->GetStreamLevel() >=5){
29f95561 1098 TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
41702fec 1099 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
1100 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
1101 Double_t chi2z = CalculateChi2Z(tracklets, offset, slope, xref);
1102 cstreamer << "FitTiltedRieman0"
1103 << "EventNumber=" << eventNumber
1104 << "CandidateNumber=" << candidateNumber
1105 << "xref=" << xref
1106 << "Chi2Z=" << chi2z
1107 << "\n";
3a039a31 1108 }*/
41702fec 1109 return chi2track;
eb38ed55 1110}
1111
3b57a3f7 1112
9e333711 1113//____________________________________________________________________
6e4d4425 1114Double_t AliTRDtrackerV1::FitLine(const AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t err, Int_t np, AliTrackPoint *points)
9e333711 1115{
1116 AliTRDLeastSquare yfitter, zfitter;
1117 AliTRDcluster *cl = 0x0;
1118
1119 AliTRDseedV1 work[kNPlanes], *tracklet = 0x0;
1120 if(!tracklets){
1121 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1122 if(!(tracklet = track->GetTracklet(ipl))) continue;
1123 if(!tracklet->IsOK()) continue;
1124 new(&work[ipl]) AliTRDseedV1(*tracklet);
1125 }
1126 tracklets = &work[0];
1127 }
1128
1129 Double_t xref = CalculateReferenceX(tracklets);
1130 Double_t x, y, z, dx, ye, yr, tilt;
1131 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1132 if(!tracklets[ipl].IsOK()) continue;
1133 for(Int_t itb = 0; itb < fgNTimeBins; itb++){
1134 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1135 if (!tracklets[ipl].IsUsable(itb)) continue;
1136 x = cl->GetX();
1137 z = cl->GetZ();
1138 dx = x - xref;
1139 zfitter.AddPoint(&dx, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
1140 }
1141 }
1142 zfitter.Eval();
1143 Double_t z0 = zfitter.GetFunctionParameter(0);
1144 Double_t dzdx = zfitter.GetFunctionParameter(1);
1145 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1146 if(!tracklets[ipl].IsOK()) continue;
1147 for(Int_t itb = 0; itb < fgNTimeBins; itb++){
1148 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1149 if (!tracklets[ipl].IsUsable(itb)) continue;
1150 x = cl->GetX();
1151 y = cl->GetY();
1152 z = cl->GetZ();
1153 tilt = tracklets[ipl].GetTilt();
1154 dx = x - xref;
1155 yr = y + tilt*(z - z0 - dzdx*dx);
1156 // error definition changes for the different calls
1157 ye = tilt*TMath::Sqrt(cl->GetSigmaZ2());
1158 ye += err ? tracklets[ipl].GetSigmaY() : 0.2;
1159 yfitter.AddPoint(&dx, yr, ye);
1160 }
1161 }
1162 yfitter.Eval();
1163 Double_t y0 = yfitter.GetFunctionParameter(0);
1164 Double_t dydx = yfitter.GetFunctionParameter(1);
1165 Double_t chi2 = 0.;//yfitter.GetChisquare()/Double_t(nPoints);
1166
1167 //update track points array
1168 if(np && points){
1169 Float_t xyz[3];
1170 for(int ip=0; ip<np; ip++){
1171 points[ip].GetXYZ(xyz);
1172 xyz[1] = y0 + dydx * (xyz[0] - xref);
1173 xyz[2] = z0 + dzdx * (xyz[0] - xref);
1174 points[ip].SetXYZ(xyz);
1175 }
1176 }
1177 return chi2;
1178}
1179
1180
3b57a3f7 1181//_________________________________________________________________________
6e4d4425 1182Double_t AliTRDtrackerV1::FitRiemanTilt(const AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t sigError, Int_t np, AliTrackPoint *points)
3b57a3f7 1183{
41702fec 1184 //
1185 // Performs a Riemann fit taking tilting pad correction into account
1186 // The equation of a Riemann circle, where the y position is substituted by the
1187 // measured y-position taking pad tilting into account, has to be transformed
1188 // into a 4-dimensional hyperplane equation
1189 // Riemann circle: (x-x0)^2 + (y-y0)^2 -R^2 = 0
1190 // Measured y-Position: ymeas = y - tan(phiT)(zc - zt)
1191 // zc: center of the pad row
1192 // zt: z-position of the track
1193 // The z-position of the track is assumed to be linear dependent on the x-position
1194 // Transformed equation: a + b * u + c * t + d * v + e * w - 2 * (ymeas + tan(phiT) * zc) * t = 0
1195 // Transformation: u = 2 * x * t
1196 // v = 2 * tan(phiT) * t
1197 // w = 2 * tan(phiT) * (x - xref) * t
1198 // t = 1 / (x^2 + ymeas^2)
1199 // Parameters: a = -1/y0
1200 // b = x0/y0
1201 // c = (R^2 -x0^2 - y0^2)/y0
1202 // d = offset
1203 // e = dz/dx
1204 // If the offset respectively the slope in z-position is impossible, the parameters are fixed using
1205 // results from the simple riemann fit. Afterwards the fit is redone.
1206 // The curvature is calculated according to the formula:
1207 // curv = a/(1 + b^2 + c*a) = 1/R
1208 //
1209 // Paramters: - Array of tracklets (connected to the track candidate)
1210 // - Flag selecting the error definition
1211 // Output: - Chi2 values of the track (in Parameter list)
1212 //
1213 TLinearFitter *fitter = GetTiltedRiemanFitter();
1214 fitter->StoreData(kTRUE);
1215 fitter->ClearPoints();
1216 AliTRDLeastSquare zfitter;
1217 AliTRDcluster *cl = 0x0;
3b57a3f7 1218
1219 AliTRDseedV1 work[kNPlanes], *tracklet = 0x0;
1220 if(!tracklets){
1221 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1222 if(!(tracklet = track->GetTracklet(ipl))) continue;
1223 if(!tracklet->IsOK()) continue;
1224 new(&work[ipl]) AliTRDseedV1(*tracklet);
1225 }
1226 tracklets = &work[0];
1227 }
1228
41702fec 1229 Double_t xref = CalculateReferenceX(tracklets);
1230 Double_t x, y, z, t, tilt, dx, w, we;
1231 Double_t uvt[4];
1232 Int_t nPoints = 0;
1233 // Containers for Least-square fitter
1234 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1235 if(!tracklets[ipl].IsOK()) continue;
8d2bec9e 1236 for(Int_t itb = 0; itb < AliTRDseedV1::kNclusters; itb++){
41702fec 1237 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1238 if (!tracklets[ipl].IsUsable(itb)) continue;
1239 x = cl->GetX();
1240 y = cl->GetY();
1241 z = cl->GetZ();
1242 tilt = tracklets[ipl].GetTilt();
1243 dx = x - xref;
1244 // Transformation
1245 t = 1./(x*x + y*y);
1246 uvt[0] = 2. * x * t;
1247 uvt[1] = t;
1248 uvt[2] = 2. * tilt * t;
1249 uvt[3] = 2. * tilt * dx * t;
1250 w = 2. * (y + tilt*z) * t;
1251 // error definition changes for the different calls
1252 we = 2. * t;
f29f13a6 1253 we *= sigError ? TMath::Sqrt(cl->GetSigmaY2()) : 0.2;
41702fec 1254 fitter->AddPoint(uvt, w, we);
1255 zfitter.AddPoint(&x, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
1256 nPoints++;
1257 }
1258 }
aec26713 1259 if(fitter->Eval()) return 1.E10;
1260
41702fec 1261 Double_t z0 = fitter->GetParameter(3);
1262 Double_t dzdx = fitter->GetParameter(4);
3b57a3f7 1263
1264
1265 // Linear fitter - not possible to make boundaries
1266 // Do not accept non possible z and dzdx combinations
1267 Bool_t accept = kTRUE;
1268 Double_t zref = 0.0;
1269 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
1270 if(!tracklets[iLayer].IsOK()) continue;
1271 zref = z0 + dzdx * (tracklets[iLayer].GetX0() - xref);
e3cf3d02 1272 if (TMath::Abs(tracklets[iLayer].GetZfit(0) - zref) > tracklets[iLayer].GetPadLength() * 0.5 + 1.0)
3b57a3f7 1273 accept = kFALSE;
1274 }
1275 if (!accept) {
41702fec 1276 zfitter.Eval();
3b57a3f7 1277 Double_t dzmf = zfitter.GetFunctionParameter(1);
1278 Double_t zmf = zfitter.GetFunctionValue(&xref);
1279 fitter->FixParameter(3, zmf);
1280 fitter->FixParameter(4, dzmf);
1281 fitter->Eval();
1282 fitter->ReleaseParameter(3);
1283 fitter->ReleaseParameter(4);
1284 z0 = fitter->GetParameter(3); // = zmf ?
1285 dzdx = fitter->GetParameter(4); // = dzmf ?
1286 }
1287
1288 // Calculate Curvature
1289 Double_t a = fitter->GetParameter(0);
1290 Double_t b = fitter->GetParameter(1);
1291 Double_t c = fitter->GetParameter(2);
1292 Double_t y0 = 1. / a;
1293 Double_t x0 = -b * y0;
a015e406 1294 Double_t tmp = y0*y0 + x0*x0 - c*y0;
1295 if(tmp<=0.) return 1.E10;
1296 Double_t R = TMath::Sqrt(tmp);
3b57a3f7 1297 Double_t C = 1.0 + b*b - c*a;
1298 if (C > 0.0) C = a / TMath::Sqrt(C);
1299
1300 // Calculate chi2 of the fit
1301 Double_t chi2 = fitter->GetChisquare()/Double_t(nPoints);
1302
1303 // Update the tracklets
1304 if(!track){
1305 for(Int_t ip = 0; ip < kNPlanes; ip++) {
1306 x = tracklets[ip].GetX0();
90cf7133 1307 tmp = R*R-(x-x0)*(x-x0);
a015e406 1308 if(tmp <= 0.) continue;
1309 tmp = TMath::Sqrt(tmp);
3b57a3f7 1310
1311 // y: R^2 = (x - x0)^2 + (y - y0)^2
1312 // => y = y0 +/- Sqrt(R^2 - (x - x0)^2)
1313 tracklets[ip].SetYref(0, y0 - (y0>0.?1.:-1)*tmp);
1314 // => dy/dx = (x - x0)/Sqrt(R^2 - (x - x0)^2)
1315 tracklets[ip].SetYref(1, (x - x0) / tmp);
1316 tracklets[ip].SetZref(0, z0 + dzdx * (x - xref));
1317 tracklets[ip].SetZref(1, dzdx);
1318 tracklets[ip].SetC(C);
1319 tracklets[ip].SetChi2(chi2);
1320 }
1321 }
3b57a3f7 1322 //update track points array
1323 if(np && points){
1324 Float_t xyz[3];
1325 for(int ip=0; ip<np; ip++){
1326 points[ip].GetXYZ(xyz);
60e55aee 1327 xyz[1] = TMath::Abs(xyz[0] - x0) > R ? 100. : y0 - (y0>0.?1.:-1.)*TMath::Sqrt((R-(xyz[0]-x0))*(R+(xyz[0]-x0)));
3b57a3f7 1328 xyz[2] = z0 + dzdx * (xyz[0] - xref);
1329 points[ip].SetXYZ(xyz);
1330 }
1331 }
1332
3b57a3f7 1333 return chi2;
1334}
1335
1336
1bf51039 1337//____________________________________________________________________
1338Double_t AliTRDtrackerV1::FitKalman(AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t up, Int_t np, AliTrackPoint *points)
1339{
1340// Kalman filter implementation for the TRD.
1341// It returns the positions of the fit in the array "points"
1342//
1343// Author : A.Bercuci@gsi.de
1344
3cfaffa4 1345 // printf("Start track @ x[%f]\n", track->GetX());
1bf51039 1346
1347 //prepare marker points along the track
1348 Int_t ip = np ? 0 : 1;
1349 while(ip<np){
1350 if((up?-1:1) * (track->GetX() - points[ip].GetX()) > 0.) break;
1351 //printf("AliTRDtrackerV1::FitKalman() : Skip track marker x[%d] = %7.3f. Before track start ( %7.3f ).\n", ip, points[ip].GetX(), track->GetX());
1352 ip++;
1353 }
1354 //if(points) printf("First marker point @ x[%d] = %f\n", ip, points[ip].GetX());
1355
1356
1357 AliTRDseedV1 tracklet, *ptrTracklet = 0x0;
1358
1359 //Loop through the TRD planes
1360 for (Int_t jplane = 0; jplane < kNPlanes; jplane++) {
1361 // GET TRACKLET OR BUILT IT
1362 Int_t iplane = up ? jplane : kNPlanes - 1 - jplane;
1363 if(tracklets){
1364 if(!(ptrTracklet = &tracklets[iplane])) continue;
1365 }else{
1366 if(!(ptrTracklet = track->GetTracklet(iplane))){
1367 /*AliTRDtrackerV1 *tracker = 0x0;
1368 if(!(tracker = dynamic_cast<AliTRDtrackerV1*>( AliTRDReconstructor::Tracker()))) continue;
1369 ptrTracklet = new(&tracklet) AliTRDseedV1(iplane);
1370 if(!tracker->MakeTracklet(ptrTracklet, track)) */
1371 continue;
1372 }
1373 }
1374 if(!ptrTracklet->IsOK()) continue;
1375
1376 Double_t x = ptrTracklet->GetX0();
1377
1378 while(ip < np){
1379 //don't do anything if next marker is after next update point.
1380 if((up?-1:1) * (points[ip].GetX() - x) - fgkMaxStep < 0) break;
1bf51039 1381 if(((up?-1:1) * (points[ip].GetX() - track->GetX()) < 0) && !PropagateToX(*track, points[ip].GetX(), fgkMaxStep)) return -1.;
1382
1383 Double_t xyz[3]; // should also get the covariance
3cfaffa4 1384 track->GetXYZ(xyz);
1385 track->Global2LocalPosition(xyz, track->GetAlpha());
1386 points[ip].SetXYZ(xyz[0], xyz[1], xyz[2]);
1bf51039 1387 ip++;
1388 }
3cfaffa4 1389 // printf("plane[%d] tracklet[%p] x[%f]\n", iplane, ptrTracklet, x);
1bf51039 1390
3cfaffa4 1391 // Propagate closer to the next update point
1bf51039 1392 if(((up?-1:1) * (x - track->GetX()) + fgkMaxStep < 0) && !PropagateToX(*track, x + (up?-1:1)*fgkMaxStep, fgkMaxStep)) return -1.;
1393
1394 if(!AdjustSector(track)) return -1;
1395 if(TMath::Abs(track->GetSnp()) > fgkMaxSnp) return -1;
1396
1397 //load tracklet to the tracker and the track
1398/* Int_t index;
1399 if((index = FindTracklet(ptrTracklet)) < 0){
1400 ptrTracklet = SetTracklet(&tracklet);
1401 index = fTracklets->GetEntriesFast()-1;
1402 }
1403 track->SetTracklet(ptrTracklet, index);*/
1404
1405
1406 // register tracklet to track with tracklet creation !!
1407 // PropagateBack : loaded tracklet to the tracker and update index
1408 // RefitInward : update index
1409 // MakeTrack : loaded tracklet to the tracker and update index
1410 if(!tracklets) track->SetTracklet(ptrTracklet, -1);
1411
1412
1413 //Calculate the mean material budget along the path inside the chamber
1414 Double_t xyz0[3]; track->GetXYZ(xyz0);
1415 Double_t alpha = track->GetAlpha();
1416 Double_t xyz1[3], y, z;
1417 if(!track->GetProlongation(x, y, z)) return -1;
1418 xyz1[0] = x * TMath::Cos(alpha) - y * TMath::Sin(alpha);
1419 xyz1[1] = +x * TMath::Sin(alpha) + y * TMath::Cos(alpha);
1420 xyz1[2] = z;
3cfaffa4 1421 if((xyz0[0] - xyz1[9] < 1e-3) && (xyz0[0] - xyz1[9] < 1e-3)) continue; // check wheter we are at the same global x position
1bf51039 1422 Double_t param[7];
3cfaffa4 1423 if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param) <=0.) break;
1bf51039 1424 Double_t xrho = param[0]*param[4]; // density*length
1425 Double_t xx0 = param[1]; // radiation length
1426
1427 //Propagate the track
1428 track->PropagateTo(x, xx0, xrho);
1429 if (!AdjustSector(track)) break;
1430
1431 //Update track
1432 Double_t chi2 = track->GetPredictedChi2(ptrTracklet);
1433 if(chi2<1e+10) track->Update(ptrTracklet, chi2);
1bf51039 1434 if(!up) continue;
1435
1436 //Reset material budget if 2 consecutive gold
1437 if(iplane>0 && track->GetTracklet(iplane-1) && ptrTracklet->GetN() + track->GetTracklet(iplane-1)->GetN() > 20) track->SetBudget(2, 0.);
1438 } // end planes loop
1439
1440 // extrapolation
1441 while(ip < np){
1442 if(((up?-1:1) * (points[ip].GetX() - track->GetX()) < 0) && !PropagateToX(*track, points[ip].GetX(), fgkMaxStep)) return -1.;
1443
1444 Double_t xyz[3]; // should also get the covariance
3cfaffa4 1445 track->GetXYZ(xyz);
1446 track->Global2LocalPosition(xyz, track->GetAlpha());
1447 points[ip].SetXYZ(xyz[0], xyz[1], xyz[2]);
1bf51039 1448 ip++;
1449 }
1450
1451 return track->GetChi2();
1452}
3b57a3f7 1453
eb38ed55 1454//_________________________________________________________________________
bb56afff 1455Float_t AliTRDtrackerV1::CalculateChi2Z(AliTRDseedV1 *tracklets, Double_t offset, Double_t slope, Double_t xref)
eb38ed55 1456{
41702fec 1457 //
1458 // Calculates the chi2-value of the track in z-Direction including tilting pad correction.
1459 // A linear dependence on the x-value serves as a model.
1460 // The parameters are related to the tilted Riemann fit.
1461 // Parameters: - Array of tracklets (AliTRDseedV1) related to the track candidate
1462 // - the offset for the reference x
1463 // - the slope
1464 // - the reference x position
1465 // Output: - The Chi2 value of the track in z-Direction
1466 //
1467 Float_t chi2Z = 0, nLayers = 0;
053767a4 1468 for (Int_t iLayer = 0; iLayer < AliTRDgeometry::kNlayer; iLayer++) {
41702fec 1469 if(!tracklets[iLayer].IsOK()) continue;
1470 Double_t z = offset + slope * (tracklets[iLayer].GetX0() - xref);
e3cf3d02 1471 chi2Z += TMath::Abs(tracklets[iLayer].GetZfit(0) - z);
41702fec 1472 nLayers++;
1473 }
1474 chi2Z /= TMath::Max((nLayers - 3.0),1.0);
1475 return chi2Z;
eb38ed55 1476}
1477
bccda319 1478//_____________________________________________________________________________
1479Int_t AliTRDtrackerV1::PropagateToX(AliTRDtrackV1 &t, Double_t xToGo, Double_t maxStep)
1480{
41702fec 1481 //
1482 // Starting from current X-position of track <t> this function
1483 // extrapolates the track up to radial position <xToGo>.
1484 // Returns 1 if track reaches the plane, and 0 otherwise
1485 //
bccda319 1486
41702fec 1487 const Double_t kEpsilon = 0.00001;
bccda319 1488
41702fec 1489 // Current track X-position
1490 Double_t xpos = t.GetX();
bccda319 1491
41702fec 1492 // Direction: inward or outward
1493 Double_t dir = (xpos < xToGo) ? 1.0 : -1.0;
bccda319 1494
41702fec 1495 while (((xToGo - xpos) * dir) > kEpsilon) {
bccda319 1496
41702fec 1497 Double_t xyz0[3];
1498 Double_t xyz1[3];
1499 Double_t param[7];
1500 Double_t x;
1501 Double_t y;
1502 Double_t z;
bccda319 1503
41702fec 1504 // The next step size
1505 Double_t step = dir * TMath::Min(TMath::Abs(xToGo-xpos),maxStep);
bccda319 1506
41702fec 1507 // Get the global position of the starting point
1508 t.GetXYZ(xyz0);
bccda319 1509
41702fec 1510 // X-position after next step
1511 x = xpos + step;
bccda319 1512
41702fec 1513 // Get local Y and Z at the X-position of the next step
1514 if (!t.GetProlongation(x,y,z)) {
1515 return 0; // No prolongation possible
1516 }
bccda319 1517
41702fec 1518 // The global position of the end point of this prolongation step
1519 xyz1[0] = x * TMath::Cos(t.GetAlpha()) - y * TMath::Sin(t.GetAlpha());
1520 xyz1[1] = +x * TMath::Sin(t.GetAlpha()) + y * TMath::Cos(t.GetAlpha());
1521 xyz1[2] = z;
bccda319 1522
41702fec 1523 // Calculate the mean material budget between start and
1524 // end point of this prolongation step
83dea92e 1525 if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param)<=0.) return 0;
bccda319 1526
41702fec 1527 // Propagate the track to the X-position after the next step
9c87a076 1528 if (!t.PropagateTo(x, param[1], param[0]*param[4])) return 0;
bccda319 1529
41702fec 1530 // Rotate the track if necessary
1531 AdjustSector(&t);
bccda319 1532
41702fec 1533 // New track X-position
1534 xpos = t.GetX();
bccda319 1535
41702fec 1536 }
bccda319 1537
41702fec 1538 return 1;
bccda319 1539
1540}
1541
eb38ed55 1542
1543//_____________________________________________________________________________
1544Int_t AliTRDtrackerV1::ReadClusters(TClonesArray* &array, TTree *clusterTree) const
1545{
41702fec 1546 //
1547 // Reads AliTRDclusters from the file.
1548 // The names of the cluster tree and branches
1549 // should match the ones used in AliTRDclusterizer::WriteClusters()
1550 //
1551
1552 Int_t nsize = Int_t(clusterTree->GetTotBytes() / (sizeof(AliTRDcluster)));
1553 TObjArray *clusterArray = new TObjArray(nsize+1000);
1554
1555 TBranch *branch = clusterTree->GetBranch("TRDcluster");
1556 if (!branch) {
1557 AliError("Can't get the branch !");
1558 return 1;
1559 }
1560 branch->SetAddress(&clusterArray);
1561
1562 if(!fClusters){
8ae98148 1563 Float_t nclusters = fReconstructor->GetRecoParam()->GetNClusters();
1564 if(fReconstructor->IsHLT()) nclusters /= AliTRDgeometry::kNsector;
1565 array = new TClonesArray("AliTRDcluster", Int_t(nclusters));
41702fec 1566 array->SetOwner(kTRUE);
1567 }
1568
1569 // Loop through all entries in the tree
1570 Int_t nEntries = (Int_t) clusterTree->GetEntries();
1571 Int_t nbytes = 0;
1572 Int_t ncl = 0;
1573 AliTRDcluster *c = 0x0;
1574 for (Int_t iEntry = 0; iEntry < nEntries; iEntry++) {
1575 // Import the tree
1576 nbytes += clusterTree->GetEvent(iEntry);
1577
1578 // Get the number of points in the detector
1579 Int_t nCluster = clusterArray->GetEntriesFast();
1580 for (Int_t iCluster = 0; iCluster < nCluster; iCluster++) {
1581 if(!(c = (AliTRDcluster *) clusterArray->UncheckedAt(iCluster))) continue;
1582 c->SetInChamber();
1583 new((*fClusters)[ncl++]) AliTRDcluster(*c);
1584 delete (clusterArray->RemoveAt(iCluster));
1585 }
1586
1587 }
1588 delete clusterArray;
1589
1590 return 0;
eb38ed55 1591}
1592
1593//_____________________________________________________________________________
1594Int_t AliTRDtrackerV1::LoadClusters(TTree *cTree)
1595{
41702fec 1596 //
66f6bfd9 1597 // Fills clusters into TRD tracking sectors
41702fec 1598 //
41702fec 1599
48f8adf3 1600 if(!fReconstructor->IsWritingClusters()){
1601 fClusters = AliTRDReconstructor::GetClusters();
1602 } else {
66f6bfd9 1603 if (ReadClusters(fClusters, cTree)) {
1604 AliError("Problem with reading the clusters !");
1605 return 1;
1606 }
1607 }
1608 SetClustersOwner();
1609
48f8adf3 1610 if(!fClusters || !fClusters->GetEntriesFast()){
66f6bfd9 1611 AliInfo("No TRD clusters");
41702fec 1612 return 1;
1613 }
66f6bfd9 1614
1615 //Int_t nin =
1616 BuildTrackingContainers();
1617
1618 //Int_t ncl = fClusters->GetEntriesFast();
1619 //AliInfo(Form("Clusters %d [%6.2f %% in the active volume]", ncl, 100.*float(nin)/ncl));
1620
1621 return 0;
1622}
1623
1624//_____________________________________________________________________________
1625Int_t AliTRDtrackerV1::LoadClusters(TClonesArray *clusters)
1626{
1627 //
1628 // Fills clusters into TRD tracking sectors
1629 // Function for use in the HLT
1630
1631 if(!clusters || !clusters->GetEntriesFast()){
1632 AliInfo("No TRD clusters");
41702fec 1633 return 1;
1634 }
1635
66f6bfd9 1636 fClusters = clusters;
1637 SetClustersOwner();
1638
1639 //Int_t nin =
1640 BuildTrackingContainers();
1641
1642 //Int_t ncl = fClusters->GetEntriesFast();
1643 //AliInfo(Form("Clusters %d [%6.2f %% in the active volume]", ncl, 100.*float(nin)/ncl));
1644
1645 return 0;
1646}
1647
1648
1649//____________________________________________________________________
1650Int_t AliTRDtrackerV1::BuildTrackingContainers()
1651{
1652// Building tracking containers for clusters
1653
1654 Int_t nin =0, icl = fClusters->GetEntriesFast();
41702fec 1655 while (icl--) {
1656 AliTRDcluster *c = (AliTRDcluster *) fClusters->UncheckedAt(icl);
1657 if(c->IsInChamber()) nin++;
1658 Int_t detector = c->GetDetector();
1659 Int_t sector = fGeom->GetSector(detector);
053767a4 1660 Int_t stack = fGeom->GetStack(detector);
1661 Int_t layer = fGeom->GetLayer(detector);
41702fec 1662
053767a4 1663 fTrSec[sector].GetChamber(stack, layer, kTRUE)->InsertCluster(c, icl);
41702fec 1664 }
b0a48c4d 1665
1666 const AliTRDCalDet *cal = AliTRDcalibDB::Instance()->GetT0Det();
053767a4 1667 for(int isector =0; isector<AliTRDgeometry::kNsector; isector++){
41702fec 1668 if(!fTrSec[isector].GetNChambers()) continue;
b0a48c4d 1669 fTrSec[isector].Init(fReconstructor, cal);
41702fec 1670 }
66f6bfd9 1671
1672 return nin;
eb38ed55 1673}
1674
1675
66f6bfd9 1676
0906e73e 1677//____________________________________________________________________
1678void AliTRDtrackerV1::UnloadClusters()
1679{
41702fec 1680 //
1681 // Clears the arrays of clusters and tracks. Resets sectors and timebins
1682 //
0906e73e 1683
41702fec 1684 if(fTracks) fTracks->Delete();
1685 if(fTracklets) fTracklets->Delete();
48f8adf3 1686 if(fClusters){
1687 if(IsClustersOwner()) fClusters->Delete();
1688
1689 // save clusters array in the reconstructor for further use.
1690 if(!fReconstructor->IsWritingClusters()){
1691 AliTRDReconstructor::SetClusters(fClusters);
1692 SetClustersOwner(kFALSE);
1693 } else AliTRDReconstructor::SetClusters(0x0);
1694 }
0906e73e 1695
053767a4 1696 for (int i = 0; i < AliTRDgeometry::kNsector; i++) fTrSec[i].Clear();
0906e73e 1697
41702fec 1698 // Increment the Event Number
1699 AliTRDtrackerDebug::SetEventNumber(AliTRDtrackerDebug::GetEventNumber() + 1);
eb38ed55 1700}
0906e73e 1701
fac58f00 1702// //____________________________________________________________________
1703// void AliTRDtrackerV1::UseClusters(const AliKalmanTrack *t, Int_t) const
1704// {
1705// const AliTRDtrackV1 *track = dynamic_cast<const AliTRDtrackV1*>(t);
1706// if(!track) return;
1707//
1708// AliTRDseedV1 *tracklet = 0x0;
1709// for(Int_t ily=AliTRDgeometry::kNlayer; ily--;){
1710// if(!(tracklet = track->GetTracklet(ily))) continue;
1711// AliTRDcluster *c = 0x0;
8d2bec9e 1712// for(Int_t ic=AliTRDseed::kNclusters; ic--;){
fac58f00 1713// if(!(c=tracklet->GetClusters(ic))) continue;
1714// c->Use();
1715// }
1716// }
1717// }
1718//
b1957d3c 1719
eb38ed55 1720//_____________________________________________________________________________
1721Bool_t AliTRDtrackerV1::AdjustSector(AliTRDtrackV1 *track)
1722{
41702fec 1723 //
1724 // Rotates the track when necessary
1725 //
1726
1727 Double_t alpha = AliTRDgeometry::GetAlpha();
1728 Double_t y = track->GetY();
1729 Double_t ymax = track->GetX()*TMath::Tan(0.5*alpha);
3cfaffa4 1730
41702fec 1731 if (y > ymax) {
1732 if (!track->Rotate( alpha)) {
1733 return kFALSE;
1734 }
1735 }
1736 else if (y < -ymax) {
1737 if (!track->Rotate(-alpha)) {
1738 return kFALSE;
1739 }
1740 }
1741
1742 return kTRUE;
0906e73e 1743
1744}
1745
eb38ed55 1746
0906e73e 1747//____________________________________________________________________
1748AliTRDseedV1* AliTRDtrackerV1::GetTracklet(AliTRDtrackV1 *track, Int_t p, Int_t &idx)
1749{
41702fec 1750 // Find tracklet for TRD track <track>
1751 // Parameters
1752 // - track
1753 // - sector
1754 // - plane
1755 // - index
1756 // Output
1757 // tracklet
1758 // index
1759 // Detailed description
1760 //
1761 idx = track->GetTrackletIndex(p);
1762 AliTRDseedV1 *tracklet = (idx==0xffff) ? 0x0 : (AliTRDseedV1*)fTracklets->UncheckedAt(idx);
1763
1764 return tracklet;
0906e73e 1765}
1766
1767//____________________________________________________________________
3b57a3f7 1768AliTRDseedV1* AliTRDtrackerV1::SetTracklet(AliTRDseedV1 *tracklet)
0906e73e 1769{
41702fec 1770 // Add this tracklet to the list of tracklets stored in the tracker
1771 //
1772 // Parameters
1773 // - tracklet : pointer to the tracklet to be added to the list
1774 //
1775 // Output
1776 // - the index of the new tracklet in the tracker tracklets list
1777 //
1778 // Detailed description
1779 // Build the tracklets list if it is not yet created (late initialization)
1780 // and adds the new tracklet to the list.
1781 //
1782 if(!fTracklets){
053767a4 1783 fTracklets = new TClonesArray("AliTRDseedV1", AliTRDgeometry::Nsector()*kMaxTracksStack);
41702fec 1784 fTracklets->SetOwner(kTRUE);
1785 }
1786 Int_t nentries = fTracklets->GetEntriesFast();
1787 return new ((*fTracklets)[nentries]) AliTRDseedV1(*tracklet);
972ef65e 1788}
1789
d20df6fc 1790//____________________________________________________________________
1791AliTRDtrackV1* AliTRDtrackerV1::SetTrack(AliTRDtrackV1 *track)
1792{
1793 // Add this track to the list of tracks stored in the tracker
1794 //
1795 // Parameters
1796 // - track : pointer to the track to be added to the list
1797 //
1798 // Output
1799 // - the pointer added
1800 //
1801 // Detailed description
1802 // Build the tracks list if it is not yet created (late initialization)
1803 // and adds the new track to the list.
1804 //
1805 if(!fTracks){
053767a4 1806 fTracks = new TClonesArray("AliTRDtrackV1", AliTRDgeometry::Nsector()*kMaxTracksStack);
d20df6fc 1807 fTracks->SetOwner(kTRUE);
1808 }
1809 Int_t nentries = fTracks->GetEntriesFast();
1810 return new ((*fTracks)[nentries]) AliTRDtrackV1(*track);
1811}
1812
1813
0906e73e 1814
e4f2f73d 1815//____________________________________________________________________
eb38ed55 1816Int_t AliTRDtrackerV1::Clusters2TracksSM(Int_t sector, AliESDEvent *esd)
e4f2f73d 1817{
41702fec 1818 //
1819 // Steer tracking for one SM.
1820 //
1821 // Parameters :
1822 // sector : Array of (SM) propagation layers containing clusters
1823 // esd : The current ESD event. On output it contains the also
1824 // the ESD (TRD) tracks found in this SM.
1825 //
1826 // Output :
1827 // Number of tracks found in this TRD supermodule.
1828 //
1829 // Detailed description
1830 //
1831 // 1. Unpack AliTRDpropagationLayers objects for each stack.
1832 // 2. Launch stack tracking.
1833 // See AliTRDtrackerV1::Clusters2TracksStack() for details.
1834 // 3. Pack results in the ESD event.
1835 //
1836
1837 // allocate space for esd tracks in this SM
1838 TClonesArray esdTrackList("AliESDtrack", 2*kMaxTracksStack);
1839 esdTrackList.SetOwner();
1840
1841 Int_t nTracks = 0;
1842 Int_t nChambers = 0;
1843 AliTRDtrackingChamber **stack = 0x0, *chamber = 0x0;
053767a4 1844 for(int istack = 0; istack<AliTRDgeometry::kNstack; istack++){
41702fec 1845 if(!(stack = fTrSec[sector].GetStack(istack))) continue;
1846 nChambers = 0;
053767a4 1847 for(int ilayer=0; ilayer<AliTRDgeometry::kNlayer; ilayer++){
1848 if(!(chamber = stack[ilayer])) continue;
3a039a31 1849 if(chamber->GetNClusters() < fgNTimeBins * fReconstructor->GetRecoParam() ->GetFindableClusters()) continue;
41702fec 1850 nChambers++;
053767a4 1851 //AliInfo(Form("sector %d stack %d layer %d clusters %d", sector, istack, ilayer, chamber->GetNClusters()));
41702fec 1852 }
1853 if(nChambers < 4) continue;
1854 //AliInfo(Form("Doing stack %d", istack));
1855 nTracks += Clusters2TracksStack(stack, &esdTrackList);
1856 }
1857 //AliInfo(Form("Found %d tracks in SM %d [%d]\n", nTracks, sector, esd->GetNumberOfTracks()));
1858
1859 for(int itrack=0; itrack<nTracks; itrack++)
1860 esd->AddTrack((AliESDtrack*)esdTrackList[itrack]);
1861
1862 // Reset Track and Candidate Number
1863 AliTRDtrackerDebug::SetCandidateNumber(0);
1864 AliTRDtrackerDebug::SetTrackNumber(0);
1865 return nTracks;
e4f2f73d 1866}
1867
1868//____________________________________________________________________
eb38ed55 1869Int_t AliTRDtrackerV1::Clusters2TracksStack(AliTRDtrackingChamber **stack, TClonesArray *esdTrackList)
e4f2f73d 1870{
41702fec 1871 //
1872 // Make tracks in one TRD stack.
1873 //
1874 // Parameters :
1875 // layer : Array of stack propagation layers containing clusters
1876 // esdTrackList : Array of ESD tracks found by the stand alone tracker.
1877 // On exit the tracks found in this stack are appended.
1878 //
1879 // Output :
1880 // Number of tracks found in this stack.
1881 //
1882 // Detailed description
1883 //
1884 // 1. Find the 3 most useful seeding chambers. See BuildSeedingConfigs() for details.
1885 // 2. Steer AliTRDtrackerV1::MakeSeeds() for 3 seeding layer configurations.
1886 // See AliTRDtrackerV1::MakeSeeds() for more details.
1887 // 3. Arrange track candidates in decreasing order of their quality
1888 // 4. Classify tracks in 5 categories according to:
1889 // a) number of layers crossed
1890 // b) track quality
1891 // 5. Sign clusters by tracks in decreasing order of track quality
1892 // 6. Build AliTRDtrack out of seeding tracklets
1893 // 7. Cook MC label
1894 // 8. Build ESD track and register it to the output list
1895 //
1896
b0a48c4d 1897 const AliTRDCalDet *cal = AliTRDcalibDB::Instance()->GetT0Det();
41702fec 1898 AliTRDtrackingChamber *chamber = 0x0;
fac58f00 1899 AliTRDtrackingChamber **ci = 0x0;
41702fec 1900 AliTRDseedV1 sseed[kMaxTracksStack*6]; // to be initialized
1901 Int_t pars[4]; // MakeSeeds parameters
1902
1903 //Double_t alpha = AliTRDgeometry::GetAlpha();
1904 //Double_t shift = .5 * alpha;
1905 Int_t configs[kNConfigs];
1906
fac58f00 1907 // Purge used clusters from the containers
1908 ci = &stack[0];
1909 for(Int_t ic = kNPlanes; ic--; ci++){
1910 if(!(*ci)) continue;
1911 (*ci)->Update();
1912 }
1913
41702fec 1914 // Build initial seeding configurations
1915 Double_t quality = BuildSeedingConfigs(stack, configs);
3a039a31 1916 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){
41702fec 1917 AliInfo(Form("Plane config %d %d %d Quality %f"
1918 , configs[0], configs[1], configs[2], quality));
1919 }
d931f2aa 1920
41702fec 1921
1922 // Initialize contors
1923 Int_t ntracks, // number of TRD track candidates
1924 ntracks1, // number of registered TRD tracks/iter
1925 ntracks2 = 0; // number of all registered TRD tracks in stack
1926 fSieveSeeding = 0;
d931f2aa 1927
1928 // Get stack index
fac58f00 1929 Int_t ic = 0; ci = &stack[0];
1930 while(ic<kNPlanes && !(*ci)){ic++; ci++;}
1931 if(!(*ci)) return ntracks2;
1932 Int_t istack = fGeom->GetStack((*ci)->GetDetector());
d931f2aa 1933
41702fec 1934 do{
1935 // Loop over seeding configurations
1936 ntracks = 0; ntracks1 = 0;
1937 for (Int_t iconf = 0; iconf<3; iconf++) {
1938 pars[0] = configs[iconf];
1939 pars[1] = ntracks;
d931f2aa 1940 pars[2] = istack;
41702fec 1941 ntracks = MakeSeeds(stack, &sseed[6*ntracks], pars);
1942 if(ntracks == kMaxTracksStack) break;
1943 }
3a039a31 1944 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1) AliInfo(Form("Candidate TRD tracks %d in iteration %d.", ntracks, fSieveSeeding));
41702fec 1945
1946 if(!ntracks) break;
1947
1948 // Sort the seeds according to their quality
1949 Int_t sort[kMaxTracksStack];
1950 TMath::Sort(ntracks, fTrackQuality, sort, kTRUE);
1951
1952 // Initialize number of tracks so far and logic switches
1953 Int_t ntracks0 = esdTrackList->GetEntriesFast();
1954 Bool_t signedTrack[kMaxTracksStack];
1955 Bool_t fakeTrack[kMaxTracksStack];
1956 for (Int_t i=0; i<ntracks; i++){
1957 signedTrack[i] = kFALSE;
1958 fakeTrack[i] = kFALSE;
1959 }
1960 //AliInfo("Selecting track candidates ...");
1961
1962 // Sieve clusters in decreasing order of track quality
1963 Double_t trackParams[7];
1964 // AliTRDseedV1 *lseed = 0x0;
1965 Int_t jSieve = 0, candidates;
1966 do{
1967 //AliInfo(Form("\t\tITER = %i ", jSieve));
1968
1969 // Check track candidates
1970 candidates = 0;
1971 for (Int_t itrack = 0; itrack < ntracks; itrack++) {
804bb02e 1972 Int_t trackIndex = sort[itrack];
1973 if (signedTrack[trackIndex] || fakeTrack[trackIndex]) continue;
41702fec 1974
1975
804bb02e 1976 // Calculate track parameters from tracklets seeds
804bb02e 1977 Int_t ncl = 0;
1978 Int_t nused = 0;
1979 Int_t nlayers = 0;
1980 Int_t findable = 0;
1981 for (Int_t jLayer = 0; jLayer < kNPlanes; jLayer++) {
1982 Int_t jseed = kNPlanes*trackIndex+jLayer;
1983 if(!sseed[jseed].IsOK()) continue;
f29f13a6 1984 if (TMath::Abs(sseed[jseed].GetYref(0) / sseed[jseed].GetX0()) < 0.158) findable++;
804bb02e 1985
1986 sseed[jseed].UpdateUsed();
1987 ncl += sseed[jseed].GetN2();
1988 nused += sseed[jseed].GetNUsed();
1989 nlayers++;
804bb02e 1990 }
1991
f29f13a6 1992 // Filter duplicated tracks
1993 if (nused > 30){
1994 //printf("Skip %d nused %d\n", trackIndex, nused);
1995 fakeTrack[trackIndex] = kTRUE;
1996 continue;
1997 }
1998 if (Float_t(nused)/ncl >= .25){
1999 //printf("Skip %d nused/ncl >= .25\n", trackIndex);
2000 fakeTrack[trackIndex] = kTRUE;
2001 continue;
2002 }
41702fec 2003
f29f13a6 2004 // Classify tracks
2005 Bool_t skip = kFALSE;
2006 switch(jSieve){
2007 case 0:
2008 if(nlayers < 6) {skip = kTRUE; break;}
2009 if(TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -5.){skip = kTRUE; break;}
2010 break;
2011
2012 case 1:
2013 if(nlayers < findable){skip = kTRUE; break;}
2014 if(TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -4.){skip = kTRUE; break;}
2015 break;
2016
2017 case 2:
2018 if ((nlayers == findable) || (nlayers == 6)) { skip = kTRUE; break;}
2019 if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -6.0){skip = kTRUE; break;}
2020 break;
2021
2022 case 3:
2023 if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -5.){skip = kTRUE; break;}
2024 break;
2025
2026 case 4:
2027 if (nlayers == 3){skip = kTRUE; break;}
2028 //if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) - nused/(nlayers-3.0) < -15.0){skip = kTRUE; break;}
2029 break;
2030 }
2031 if(skip){
2032 candidates++;
2033 //printf("REJECTED : %d [%d] nlayers %d trackQuality = %e nused %d\n", itrack, trackIndex, nlayers, fTrackQuality[trackIndex], nused);
2034 continue;
2035 }
2036 signedTrack[trackIndex] = kTRUE;
2037
2038 // Build track parameters
2039 AliTRDseedV1 *lseed =&sseed[trackIndex*6];
2040 /* Int_t idx = 0;
2041 while(idx<3 && !lseed->IsOK()) {
2042 idx++;
2043 lseed++;
2044 }*/
2045 Double_t x = lseed->GetX0();// - 3.5;
2046 trackParams[0] = x; //NEW AB
2047 trackParams[1] = lseed->GetYref(0); // lseed->GetYat(x);
2048 trackParams[2] = lseed->GetZref(0); // lseed->GetZat(x);
2049 trackParams[3] = TMath::Sin(TMath::ATan(lseed->GetYref(1)));
2050 trackParams[4] = lseed->GetZref(1) / TMath::Sqrt(1. + lseed->GetYref(1) * lseed->GetYref(1));
2051 trackParams[5] = lseed->GetC();
2052 Int_t ich = 0; while(!(chamber = stack[ich])) ich++;
2053 trackParams[6] = fGeom->GetSector(chamber->GetDetector());/* *alpha+shift; // Supermodule*/
2054
2055 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){
2056 AliInfo(Form("Track %d [%d] nlayers %d trackQuality = %e nused %d, yref = %3.3f", itrack, trackIndex, nlayers, fTrackQuality[trackIndex], nused, trackParams[1]));
2057
f29f13a6 2058 AliTRDseedV1 *dseed[6];
b82b4de1 2059 for(Int_t iseed = AliTRDgeometry::kNlayer; iseed--;) dseed[iseed] = new AliTRDseedV1(lseed[iseed]);
f29f13a6 2060
2061 //Int_t eventNrInFile = esd->GetEventNumberInFile();
2062 //AliInfo(Form("Number of clusters %d.", nclusters));
2063 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2064 Int_t trackNumber = AliTRDtrackerDebug::GetTrackNumber();
2065 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2066 TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
2067 cstreamer << "Clusters2TracksStack"
2068 << "EventNumber=" << eventNumber
2069 << "TrackNumber=" << trackNumber
2070 << "CandidateNumber=" << candidateNumber
2071 << "Iter=" << fSieveSeeding
2072 << "Like=" << fTrackQuality[trackIndex]
2073 << "S0.=" << dseed[0]
2074 << "S1.=" << dseed[1]
2075 << "S2.=" << dseed[2]
2076 << "S3.=" << dseed[3]
2077 << "S4.=" << dseed[4]
2078 << "S5.=" << dseed[5]
2079 << "p0=" << trackParams[0]
2080 << "p1=" << trackParams[1]
2081 << "p2=" << trackParams[2]
2082 << "p3=" << trackParams[3]
2083 << "p4=" << trackParams[4]
2084 << "p5=" << trackParams[5]
2085 << "p6=" << trackParams[6]
f29f13a6 2086 << "Ncl=" << ncl
2087 << "NLayers=" << nlayers
2088 << "Findable=" << findable
2089 << "NUsed=" << nused
2090 << "\n";
2091 }
d877f55f 2092
f29f13a6 2093 AliTRDtrackV1 *track = MakeTrack(&sseed[trackIndex*kNPlanes], trackParams);
2094 if(!track){
2095 AliWarning("Fail to build a TRD Track.");
2096 continue;
d877f55f 2097 }
41702fec 2098
f29f13a6 2099 //AliInfo("End of MakeTrack()");
2100 AliESDtrack *esdTrack = new ((*esdTrackList)[ntracks0++]) AliESDtrack();
2101 esdTrack->UpdateTrackParams(track, AliESDtrack::kTRDout);
2102 esdTrack->SetLabel(track->GetLabel());
2103 track->UpdateESDtrack(esdTrack);
2104 // write ESD-friends if neccessary
2105 if (fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 0){
2106 AliTRDtrackV1 *calibTrack = new AliTRDtrackV1(*track);
2107 calibTrack->SetOwner();
2108 esdTrack->AddCalibObject(calibTrack);
2109 }
2110 ntracks1++;
2111 AliTRDtrackerDebug::SetTrackNumber(AliTRDtrackerDebug::GetTrackNumber() + 1);
41702fec 2112 }
2113
2114 jSieve++;
2115 } while(jSieve<5 && candidates); // end track candidates sieve
2116 if(!ntracks1) break;
2117
2118 // increment counters
2119 ntracks2 += ntracks1;
4302c900 2120
2121 if(fReconstructor->IsHLT()) break;
41702fec 2122 fSieveSeeding++;
2123
2124 // Rebuild plane configurations and indices taking only unused clusters into account
2125 quality = BuildSeedingConfigs(stack, configs);
3a039a31 2126 if(quality < 1.E-7) break; //fReconstructor->GetRecoParam() ->GetPlaneQualityThreshold()) break;
41702fec 2127
2128 for(Int_t ip = 0; ip < kNPlanes; ip++){
2129 if(!(chamber = stack[ip])) continue;
b0a48c4d 2130 chamber->Build(fGeom, cal);//Indices(fSieveSeeding);
41702fec 2131 }
2132
3a039a31 2133 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){
41702fec 2134 AliInfo(Form("Sieve level %d Plane config %d %d %d Quality %f", fSieveSeeding, configs[0], configs[1], configs[2], quality));
2135 }
2136 } while(fSieveSeeding<10); // end stack clusters sieve
2137
2138
2139
2140 //AliInfo(Form("Registered TRD tracks %d in stack %d.", ntracks2, pars[1]));
2141
2142 return ntracks2;
e4f2f73d 2143}
2144
2145//___________________________________________________________________
eb38ed55 2146Double_t AliTRDtrackerV1::BuildSeedingConfigs(AliTRDtrackingChamber **stack, Int_t *configs)
e4f2f73d 2147{
41702fec 2148 //
2149 // Assign probabilities to chambers according to their
2150 // capability of producing seeds.
2151 //
2152 // Parameters :
2153 //
2154 // layers : Array of stack propagation layers for all 6 chambers in one stack
2155 // configs : On exit array of configuration indexes (see GetSeedingConfig()
2156 // for details) in the decreasing order of their seeding probabilities.
2157 //
2158 // Output :
2159 //
2160 // Return top configuration quality
2161 //
2162 // Detailed description:
2163 //
2164 // To each chamber seeding configuration (see GetSeedingConfig() for
2165 // the list of all configurations) one defines 2 quality factors:
2166 // - an apriori topological quality (see GetSeedingConfig() for details) and
2167 // - a data quality based on the uniformity of the distribution of
2168 // clusters over the x range (time bins population). See CookChamberQA() for details.
2169 // The overall chamber quality is given by the product of this 2 contributions.
2170 //
2171
ed15ef4f 2172 Double_t chamberQ[kNPlanes];
41702fec 2173 AliTRDtrackingChamber *chamber = 0x0;
2174 for(int iplane=0; iplane<kNPlanes; iplane++){
2175 if(!(chamber = stack[iplane])) continue;
2176 chamberQ[iplane] = (chamber = stack[iplane]) ? chamber->GetQuality() : 0.;
2177 }
2178
ed15ef4f 2179 Double_t tconfig[kNConfigs];
2180 Int_t planes[4];
41702fec 2181 for(int iconf=0; iconf<kNConfigs; iconf++){
2182 GetSeedingConfig(iconf, planes);
2183 tconfig[iconf] = fgTopologicQA[iconf];
2184 for(int iplane=0; iplane<4; iplane++) tconfig[iconf] *= chamberQ[planes[iplane]];
2185 }
2186
2187 TMath::Sort((Int_t)kNConfigs, tconfig, configs, kTRUE);
2188 // AliInfo(Form("q[%d] = %f", configs[0], tconfig[configs[0]]));
2189 // AliInfo(Form("q[%d] = %f", configs[1], tconfig[configs[1]]));
2190 // AliInfo(Form("q[%d] = %f", configs[2], tconfig[configs[2]]));
2191
2192 return tconfig[configs[0]];
e4f2f73d 2193}
2194
2195//____________________________________________________________________
eb38ed55 2196Int_t AliTRDtrackerV1::MakeSeeds(AliTRDtrackingChamber **stack, AliTRDseedV1 *sseed, Int_t *ipar)
e4f2f73d 2197{
41702fec 2198 //
2199 // Make tracklet seeds in the TRD stack.
2200 //
2201 // Parameters :
2202 // layers : Array of stack propagation layers containing clusters
2203 // sseed : Array of empty tracklet seeds. On exit they are filled.
2204 // ipar : Control parameters:
2205 // ipar[0] -> seeding chambers configuration
2206 // ipar[1] -> stack index
2207 // ipar[2] -> number of track candidates found so far
2208 //
2209 // Output :
2210 // Number of tracks candidates found.
2211 //
2212 // Detailed description
2213 //
2214 // The following steps are performed:
2215 // 1. Select seeding layers from seeding chambers
2216 // 2. Select seeding clusters from the seeding AliTRDpropagationLayerStack.
2217 // The clusters are taken from layer 3, layer 0, layer 1 and layer 2, in
2218 // this order. The parameters controling the range of accepted clusters in
2219 // layer 0, 1, and 2 are defined in AliTRDchamberTimeBin::BuildCond().
2220 // 3. Helix fit of the cluster set. (see AliTRDtrackerFitter::FitRieman(AliTRDcluster**))
2221 // 4. Initialize seeding tracklets in the seeding chambers.
2222 // 5. Filter 0.
2223 // Chi2 in the Y direction less than threshold ... (1./(3. - sLayer))
2224 // Chi2 in the Z direction less than threshold ... (1./(3. - sLayer))
2225 // 6. Attach clusters to seeding tracklets and find linear approximation of
2226 // the tracklet (see AliTRDseedV1::AttachClustersIter()). The number of used
2227 // clusters used by current seeds should not exceed ... (25).
2228 // 7. Filter 1.
2229 // All 4 seeding tracklets should be correctly constructed (see
2230 // AliTRDseedV1::AttachClustersIter())
2231 // 8. Helix fit of the seeding tracklets
2232 // 9. Filter 2.
2233 // Likelihood calculation of the fit. (See AliTRDtrackerV1::CookLikelihood() for details)
2234 // 10. Extrapolation of the helix fit to the other 2 chambers:
2235 // a) Initialization of extrapolation tracklet with fit parameters
2236 // b) Helix fit of tracklets
2237 // c) Attach clusters and linear interpolation to extrapolated tracklets
2238 // d) Helix fit of tracklets
2239 // 11. Improve seeding tracklets quality by reassigning clusters.
2240 // See AliTRDtrackerV1::ImproveSeedQuality() for details.
2241 // 12. Helix fit of all 6 seeding tracklets and chi2 calculation
2242 // 13. Hyperplane fit and track quality calculation. See AliTRDtrackerFitter::FitHyperplane() for details.
2243 // 14. Cooking labels for tracklets. Should be done only for MC
2244 // 15. Register seeds.
2245 //
2246
2247 AliTRDtrackingChamber *chamber = 0x0;
be24510a 2248 AliTRDcluster *c[kNSeedPlanes] = {0x0, 0x0, 0x0, 0x0}; // initilize seeding clusters
41702fec 2249 AliTRDseedV1 *cseed = &sseed[0]; // initialize tracklets for first track
2250 Int_t ncl, mcl; // working variable for looping over clusters
2251 Int_t index[AliTRDchamberTimeBin::kMaxClustersLayer], jndex[AliTRDchamberTimeBin::kMaxClustersLayer];
2252 // chi2 storage
2253 // chi2[0] = tracklet chi2 on the Z direction
2254 // chi2[1] = tracklet chi2 on the R direction
2255 Double_t chi2[4];
2256
e79f8eb0 2257 // Default positions for the anode wire in all 6 Layers in case of a stack with missing clusters
2258 // Positions taken using cosmic data taken with SM3 after rebuild
d931f2aa 2259 Double_t x_def[kNPlanes] = {300.2, 312.8, 325.4, 338.0, 350.6, 363.2};
41702fec 2260
2261 // this should be data member of AliTRDtrack
2262 Double_t seedQuality[kMaxTracksStack];
2263
2264 // unpack control parameters
2265 Int_t config = ipar[0];
2266 Int_t ntracks = ipar[1];
d931f2aa 2267 Int_t istack = ipar[2];
41702fec 2268 Int_t planes[kNSeedPlanes]; GetSeedingConfig(config, planes);
be24510a 2269 Int_t planesExt[kNPlanes-kNSeedPlanes]; GetExtrapolationConfig(config, planesExt);
2270
2271
41702fec 2272 // Init chambers geometry
41702fec 2273 Double_t hL[kNPlanes]; // Tilting angle
2274 Float_t padlength[kNPlanes]; // pad lenghts
dd8059a8 2275 Float_t padwidth[kNPlanes]; // pad widths
41702fec 2276 AliTRDpadPlane *pp = 0x0;
2277 for(int iplane=0; iplane<kNPlanes; iplane++){
2278 pp = fGeom->GetPadPlane(iplane, istack);
bb79ccd5 2279 hL[iplane] = TMath::Tan(TMath::DegToRad()*pp->GetTiltingAngle());
41702fec 2280 padlength[iplane] = pp->GetLengthIPad();
dd8059a8 2281 padwidth[iplane] = pp->GetWidthIPad();
41702fec 2282 }
2283
3a039a31 2284 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){
41702fec 2285 AliInfo(Form("Making seeds Stack[%d] Config[%d] Tracks[%d]...", istack, config, ntracks));
2286 }
2287
d931f2aa 2288 // Build seeding layers
d611c74f 2289 ResetSeedTB();
41702fec 2290 Int_t nlayers = 0;
41702fec 2291 for(int isl=0; isl<kNSeedPlanes; isl++){
2292 if(!(chamber = stack[planes[isl]])) continue;
3a039a31 2293 if(!chamber->GetSeedingLayer(fSeedTB[isl], fGeom, fReconstructor)) continue;
41702fec 2294 nlayers++;
41702fec 2295 }
1ba638fc 2296 if(nlayers < 4) return ntracks;
41702fec 2297
2298
2299 // Start finding seeds
2300 Double_t cond0[4], cond1[4], cond2[4];
2301 Int_t icl = 0;
d611c74f 2302 while((c[3] = (*fSeedTB[3])[icl++])){
41702fec 2303 if(!c[3]) continue;
d611c74f 2304 fSeedTB[0]->BuildCond(c[3], cond0, 0);
2305 fSeedTB[0]->GetClusters(cond0, index, ncl);
41702fec 2306 //printf("Found c[3] candidates 0 %d\n", ncl);
2307 Int_t jcl = 0;
2308 while(jcl<ncl) {
d611c74f 2309 c[0] = (*fSeedTB[0])[index[jcl++]];
41702fec 2310 if(!c[0]) continue;
2311 Double_t dx = c[3]->GetX() - c[0]->GetX();
2312 Double_t theta = (c[3]->GetZ() - c[0]->GetZ())/dx;
2313 Double_t phi = (c[3]->GetY() - c[0]->GetY())/dx;
d611c74f 2314 fSeedTB[1]->BuildCond(c[0], cond1, 1, theta, phi);
2315 fSeedTB[1]->GetClusters(cond1, jndex, mcl);
41702fec 2316 //printf("Found c[0] candidates 1 %d\n", mcl);
2317
2318 Int_t kcl = 0;
2319 while(kcl<mcl) {
d611c74f 2320 c[1] = (*fSeedTB[1])[jndex[kcl++]];
2321 if(!c[1]) continue;
2322 fSeedTB[2]->BuildCond(c[1], cond2, 2, theta, phi);
2323 c[2] = fSeedTB[2]->GetNearestCluster(cond2);
2324 //printf("Found c[1] candidate 2 %p\n", c[2]);
2325 if(!c[2]) continue;
2326
2327 // AliInfo("Seeding clusters found. Building seeds ...");
2328 // 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());
2329
804bb02e 2330 for (Int_t il = 0; il < kNPlanes; il++) cseed[il].Reset();
41702fec 2331
d611c74f 2332 FitRieman(c, chi2);
2333
d931f2aa 2334 AliTRDseedV1 *tseed = &cseed[0];
2335 AliTRDtrackingChamber **cIter = &stack[0];
2336 for(int iLayer=0; iLayer<kNPlanes; iLayer++, tseed++, cIter++){
2337 tseed->SetDetector((*cIter) ? (*cIter)->GetDetector() : -1);
43d6ad34 2338 tseed->SetTilt(hL[iLayer]);
2339 tseed->SetPadLength(padlength[iLayer]);
dd8059a8 2340 tseed->SetPadWidth(padwidth[iLayer]);
3a039a31 2341 tseed->SetReconstructor(fReconstructor);
d931f2aa 2342 tseed->SetX0((*cIter) ? (*cIter)->GetX() : x_def[iLayer]);
d611c74f 2343 tseed->Init(GetRiemanFitter());
f29f13a6 2344 tseed->SetStandAlone(kTRUE);
d611c74f 2345 }
2346
2347 Bool_t isFake = kFALSE;
3a039a31 2348 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){
d611c74f 2349 if (c[0]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
2350 if (c[1]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
2351 if (c[2]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
2352
2353 Double_t xpos[4];
2354 for(Int_t l = 0; l < kNSeedPlanes; l++) xpos[l] = fSeedTB[l]->GetX();
2355 Float_t yref[4];
2356 for(int il=0; il<4; il++) yref[il] = cseed[planes[il]].GetYref(0);
2357 Int_t ll = c[3]->GetLabel(0);
2358 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2359 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2360 AliRieman *rim = GetRiemanFitter();
29f95561 2361 TTreeSRedirector &cs0 = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
d611c74f 2362 cs0 << "MakeSeeds0"
2363 <<"EventNumber=" << eventNumber
2364 <<"CandidateNumber=" << candidateNumber
2365 <<"isFake=" << isFake
2366 <<"config=" << config
2367 <<"label=" << ll
2368 <<"chi2z=" << chi2[0]
2369 <<"chi2y=" << chi2[1]
2370 <<"Y2exp=" << cond2[0]
2371 <<"Z2exp=" << cond2[1]
2372 <<"X0=" << xpos[0] //layer[sLayer]->GetX()
2373 <<"X1=" << xpos[1] //layer[sLayer + 1]->GetX()
2374 <<"X2=" << xpos[2] //layer[sLayer + 2]->GetX()
2375 <<"X3=" << xpos[3] //layer[sLayer + 3]->GetX()
2376 <<"yref0=" << yref[0]
2377 <<"yref1=" << yref[1]
2378 <<"yref2=" << yref[2]
2379 <<"yref3=" << yref[3]
2380 <<"c0.=" << c[0]
2381 <<"c1.=" << c[1]
2382 <<"c2.=" << c[2]
2383 <<"c3.=" << c[3]
2384 <<"Seed0.=" << &cseed[planes[0]]
2385 <<"Seed1.=" << &cseed[planes[1]]
2386 <<"Seed2.=" << &cseed[planes[2]]
2387 <<"Seed3.=" << &cseed[planes[3]]
2388 <<"RiemanFitter.=" << rim
2389 <<"\n";
2390 }
3a039a31 2391 if(chi2[0] > fReconstructor->GetRecoParam() ->GetChi2Z()/*7./(3. - sLayer)*//*iter*/){
91834b8d 2392// //AliInfo(Form("Failed chi2 filter on chi2Z [%f].", chi2[0]));
d611c74f 2393 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2394 continue;
2395 }
3a039a31 2396 if(chi2[1] > fReconstructor->GetRecoParam() ->GetChi2Y()/*1./(3. - sLayer)*//*iter*/){
91834b8d 2397// //AliInfo(Form("Failed chi2 filter on chi2Y [%f].", chi2[1]));
d611c74f 2398 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2399 continue;
2400 }
2401 //AliInfo("Passed chi2 filter.");
2402
2403 // try attaching clusters to tracklets
d611c74f 2404 Int_t mlayers = 0;
be24510a 2405 for(int iLayer=0; iLayer<kNSeedPlanes; iLayer++){
d611c74f 2406 Int_t jLayer = planes[iLayer];
f29f13a6 2407 if(!cseed[jLayer].AttachClusters(stack[jLayer], kTRUE)) continue;
2408 cseed[jLayer].UpdateUsed();
2409 if(!cseed[jLayer].IsOK()) continue;
d611c74f 2410 mlayers++;
2411 }
be24510a 2412
2413 if(mlayers < kNSeedPlanes){
2414 //AliInfo(Form("Failed updating all seeds %d [%d].", mlayers, kNSeedPlanes));
2415 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2416 continue;
2417 }
2418
2419 // temporary exit door for the HLT
4302c900 2420 if(fReconstructor->IsHLT()){
be24510a 2421 // attach clusters to extrapolation chambers
2422 for(int iLayer=0; iLayer<kNPlanes-kNSeedPlanes; iLayer++){
2423 Int_t jLayer = planesExt[iLayer];
2424 if(!(chamber = stack[jLayer])) continue;
f29f13a6 2425 cseed[jLayer].AttachClusters(chamber, kTRUE);
be24510a 2426 }
4302c900 2427 fTrackQuality[ntracks] = 1.; // dummy value
2428 ntracks++;
218ba867 2429 if(ntracks == kMaxTracksStack) return ntracks;
4302c900 2430 cseed += 6;
2431 continue;
2432 }
2433
be24510a 2434
f29f13a6 2435 // Update Seeds and calculate Likelihood
d611c74f 2436 // fit tracklets and cook likelihood
f29f13a6 2437 FitTiltedRieman(&cseed[0], kTRUE);
2438 for(int iLayer=0; iLayer<kNSeedPlanes; iLayer++){
2439 Int_t jLayer = planes[iLayer];
2440 cseed[jLayer].Fit(kTRUE);
2441 }
91834b8d 2442 Double_t like = CookLikelihood(&cseed[0], planes); // to be checked
d611c74f 2443
3a039a31 2444 if (TMath::Log(1.E-9 + like) < fReconstructor->GetRecoParam() ->GetTrackLikelihood()){
d611c74f 2445 //AliInfo(Form("Failed likelihood %f[%e].", TMath::Log(1.E-9 + like), like));
2446 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2447 continue;
2448 }
2449 //AliInfo(Form("Passed likelihood %f[%e].", TMath::Log(1.E-9 + like), like));
2450
2451 // book preliminary results
2452 seedQuality[ntracks] = like;
2453 fSeedLayer[ntracks] = config;/*sLayer;*/
2454
2455 // attach clusters to the extrapolation seeds
be24510a 2456 for(int iLayer=0; iLayer<kNPlanes-kNSeedPlanes; iLayer++){
2457 Int_t jLayer = planesExt[iLayer];
d611c74f 2458 if(!(chamber = stack[jLayer])) continue;
d611c74f 2459
2460 // fit extrapolated seed
2461 if ((jLayer == 0) && !(cseed[1].IsOK())) continue;
2462 if ((jLayer == 5) && !(cseed[4].IsOK())) continue;
2463 AliTRDseedV1 pseed = cseed[jLayer];
f29f13a6 2464 if(!pseed.AttachClusters(chamber, kTRUE)) continue;
2465 pseed.Fit(kTRUE);
d611c74f 2466 cseed[jLayer] = pseed;
d611c74f 2467 FitTiltedRieman(cseed, kTRUE);
f29f13a6 2468 cseed[jLayer].Fit(kTRUE);
d611c74f 2469 }
2470
2471 // AliInfo("Extrapolation done.");
2472 // Debug Stream containing all the 6 tracklets
3a039a31 2473 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){
29f95561 2474 TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
d611c74f 2475 TLinearFitter *tiltedRieman = GetTiltedRiemanFitter();
2476 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2477 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2478 cstreamer << "MakeSeeds1"
2479 << "EventNumber=" << eventNumber
2480 << "CandidateNumber=" << candidateNumber
2481 << "S0.=" << &cseed[0]
2482 << "S1.=" << &cseed[1]
2483 << "S2.=" << &cseed[2]
2484 << "S3.=" << &cseed[3]
2485 << "S4.=" << &cseed[4]
2486 << "S5.=" << &cseed[5]
2487 << "FitterT.=" << tiltedRieman
2488 << "\n";
2489 }
2490
fb872574 2491 if(fReconstructor->GetRecoParam()->HasImproveTracklets() && ImproveSeedQuality(stack, cseed) < 4){
d611c74f 2492 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2493 continue;
2494 }
2495 //AliInfo("Improve seed quality done.");
2496
2497 // fit full track and cook likelihoods
2498 // Double_t curv = FitRieman(&cseed[0], chi2);
2499 // Double_t chi2ZF = chi2[0] / TMath::Max((mlayers - 3.), 1.);
2500 // Double_t chi2RF = chi2[1] / TMath::Max((mlayers - 3.), 1.);
2501
2502 // do the final track fitting (Once with vertex constraint and once without vertex constraint)
2503 Double_t chi2Vals[3];
2504 chi2Vals[0] = FitTiltedRieman(&cseed[0], kFALSE);
91834b8d 2505 if(fReconstructor->GetRecoParam()->IsVertexConstrained())
d611c74f 2506 chi2Vals[1] = FitTiltedRiemanConstraint(&cseed[0], GetZ()); // Do Vertex Constrained fit if desired
2507 else
2508 chi2Vals[1] = 1.;
2509 chi2Vals[2] = GetChi2Z(&cseed[0]) / TMath::Max((mlayers - 3.), 1.);
2510 // Chi2 definitions in testing stage
2511 //chi2Vals[2] = GetChi2ZTest(&cseed[0]);
2512 fTrackQuality[ntracks] = CalculateTrackLikelihood(&cseed[0], &chi2Vals[0]);
2513 //AliInfo("Hyperplane fit done\n");
fac58f00 2514
3a039a31 2515 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){
29f95561 2516 TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
d611c74f 2517 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2518 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2519 TLinearFitter *fitterTC = GetTiltedRiemanFitterConstraint();
2520 TLinearFitter *fitterT = GetTiltedRiemanFitter();
91834b8d 2521 Int_t ncls = 0;
2522 for(Int_t iseed = 0; iseed < kNPlanes; iseed++){
2523 ncls += cseed[iseed].IsOK() ? cseed[iseed].GetN2() : 0;
2524 }
d611c74f 2525 cstreamer << "MakeSeeds2"
2526 << "EventNumber=" << eventNumber
2527 << "CandidateNumber=" << candidateNumber
2528 << "Chi2TR=" << chi2Vals[0]
2529 << "Chi2TC=" << chi2Vals[1]
2530 << "Nlayers=" << mlayers
91834b8d 2531 << "NClusters=" << ncls
d611c74f 2532 << "Like=" << like
2533 << "S0.=" << &cseed[0]
2534 << "S1.=" << &cseed[1]
2535 << "S2.=" << &cseed[2]
2536 << "S3.=" << &cseed[3]
2537 << "S4.=" << &cseed[4]
2538 << "S5.=" << &cseed[5]
d611c74f 2539 << "FitterT.=" << fitterT
2540 << "FitterTC.=" << fitterTC
2541 << "\n";
2542 }
2543
2544 ntracks++;
2545 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2546 if(ntracks == kMaxTracksStack){
2547 AliWarning(Form("Number of seeds reached maximum allowed (%d) in stack.", kMaxTracksStack));
2548 return ntracks;
2549 }
2550 cseed += 6;
41702fec 2551 }
2552 }
2553 }
41702fec 2554
2555 return ntracks;
e4f2f73d 2556}
2557
2558//_____________________________________________________________________________
0906e73e 2559AliTRDtrackV1* AliTRDtrackerV1::MakeTrack(AliTRDseedV1 *seeds, Double_t *params)
e4f2f73d 2560{
41702fec 2561 //
2562 // Build a TRD track out of tracklet candidates
2563 //
2564 // Parameters :
2565 // seeds : array of tracklets
2566 // params : track parameters (see MakeSeeds() function body for a detailed description)
2567 //
2568 // Output :
2569 // The TRD track.
2570 //
2571 // Detailed description
2572 //
2573 // To be discussed with Marian !!
2574 //
2575
41702fec 2576
2577 Double_t alpha = AliTRDgeometry::GetAlpha();
2578 Double_t shift = AliTRDgeometry::GetAlpha()/2.0;
2579 Double_t c[15];
2580
2581 c[ 0] = 0.2;
2582 c[ 1] = 0.0; c[ 2] = 2.0;
2583 c[ 3] = 0.0; c[ 4] = 0.0; c[ 5] = 0.02;
2584 c[ 6] = 0.0; c[ 7] = 0.0; c[ 8] = 0.0; c[ 9] = 0.1;
2585 c[10] = 0.0; c[11] = 0.0; c[12] = 0.0; c[13] = 0.0; c[14] = params[5]*params[5]*0.01;
2586
d20df6fc 2587 AliTRDtrackV1 track(seeds, &params[1], c, params[0], params[6]*alpha+shift);
2588 track.PropagateTo(params[0]-5.0);
f29f13a6 2589 AliTRDseedV1 *ptrTracklet = 0x0;
2590 // Sign clusters
2591 for (Int_t jLayer = 0; jLayer < AliTRDgeometry::kNlayer; jLayer++) {
2592 ptrTracklet = &seeds[jLayer];
2593 if(!ptrTracklet->IsOK()) continue;
2594 if(TMath::Abs(ptrTracklet->GetYref(1) - ptrTracklet->GetYfit(1)) >= .2) continue; // check this condition with Marian
2595 }
2596 //
91834b8d 2597 if(fReconstructor->IsHLT()){
91834b8d 2598 for(Int_t ip=0; ip<kNPlanes; ip++){
2599 track.UnsetTracklet(ip);
2600 ptrTracklet = SetTracklet(&seeds[ip]);
f29f13a6 2601 ptrTracklet->UseClusters();
91834b8d 2602 track.SetTracklet(ptrTracklet, fTracklets->GetEntriesFast()-1);
2603 }
d78d7df0 2604 AliTRDtrackV1 *ptrTrack = SetTrack(&track);
2605 ptrTrack->SetReconstructor(fReconstructor);
2606 return ptrTrack;
91834b8d 2607 }
393fda1c 2608
d20df6fc 2609 track.ResetCovariance(1);
e79f8eb0 2610 Int_t nc = TMath::Abs(FollowBackProlongation(track));
393fda1c 2611 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 5){
2612 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2613 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2614 Double_t p[5]; // Track Params for the Debug Stream
2615 track.GetExternalParameters(params[0], p);
29f95561 2616 TTreeSRedirector &cs = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
393fda1c 2617 cs << "MakeTrack"
2618 << "EventNumber=" << eventNumber
2619 << "CandidateNumber=" << candidateNumber
2620 << "nc=" << nc
2621 << "X=" << params[0]
2622 << "Y=" << p[0]
2623 << "Z=" << p[1]
2624 << "snp=" << p[2]
2625 << "tnd=" << p[3]
2626 << "crv=" << p[4]
2627 << "Yin=" << params[1]
2628 << "Zin=" << params[2]
2629 << "snpin=" << params[3]
2630 << "tndin=" << params[4]
2631 << "crvin=" << params[5]
2632 << "track.=" << &track
2633 << "\n";
2634 }
d20df6fc 2635 if (nc < 30) return 0x0;
2636
2637 AliTRDtrackV1 *ptrTrack = SetTrack(&track);
215f7116 2638 ptrTrack->SetReconstructor(fReconstructor);
48f8adf3 2639 ptrTrack->CookLabel(.9);
24253b0a 2640
d20df6fc 2641 // computes PID for track
2642 ptrTrack->CookPID();
2643 // update calibration references using this track
48f8adf3 2644 AliTRDCalibraFillHisto *calibra = AliTRDCalibraFillHisto::Instance();
2645 if (!calibra){
2646 AliInfo("Could not get Calibra instance\n");
2647 if(calibra->GetHisto2d()) calibra->UpdateHistogramsV1(ptrTrack);
2648 }
d20df6fc 2649 return ptrTrack;
e4f2f73d 2650}
2651
0906e73e 2652
e4f2f73d 2653//____________________________________________________________________
eb38ed55 2654Int_t AliTRDtrackerV1::ImproveSeedQuality(AliTRDtrackingChamber **stack, AliTRDseedV1 *cseed)
e4f2f73d 2655{
41702fec 2656 //
2657 // Sort tracklets according to "quality" and try to "improve" the first 4 worst
2658 //
2659 // Parameters :
2660 // layers : Array of propagation layers for a stack/supermodule
2661 // cseed : Array of 6 seeding tracklets which has to be improved
2662 //
f29f13a6 2663 // Output :
41702fec 2664 // cssed : Improved seeds
2665 //
2666 // Detailed description
2667 //
2668 // Iterative procedure in which new clusters are searched for each
2669 // tracklet seed such that the seed quality (see AliTRDseed::GetQuality())
2670 // can be maximized. If some optimization is found the old seeds are replaced.
2671 //
2672 // debug level: 7
2673 //
2674
2675 // make a local working copy
2676 AliTRDtrackingChamber *chamber = 0x0;
2677 AliTRDseedV1 bseed[6];
2678 Int_t nLayers = 0;
2679 for (Int_t jLayer = 0; jLayer < 6; jLayer++) bseed[jLayer] = cseed[jLayer];
2680
2681 Float_t lastquality = 10000.0;
2682 Float_t lastchi2 = 10000.0;
2683 Float_t chi2 = 1000.0;
2684
2685 for (Int_t iter = 0; iter < 4; iter++) {
2686 Float_t sumquality = 0.0;
2687 Float_t squality[6];
2688 Int_t sortindexes[6];
2689
2690 for (Int_t jLayer = 0; jLayer < 6; jLayer++) {
3a039a31 2691 squality[jLayer] = bseed[jLayer].IsOK() ? bseed[jLayer].GetQuality(kTRUE) : 1000.;
41702fec 2692 sumquality += squality[jLayer];
2693 }
2694 if ((sumquality >= lastquality) || (chi2 > lastchi2)) break;
2695
2696 nLayers = 0;
2697 lastquality = sumquality;
2698 lastchi2 = chi2;
2699 if (iter > 0) for (Int_t jLayer = 0; jLayer < 6; jLayer++) cseed[jLayer] = bseed[jLayer];
2700
2701 TMath::Sort(6, squality, sortindexes, kFALSE);
2702 for (Int_t jLayer = 5; jLayer > 1; jLayer--) {
2703 Int_t bLayer = sortindexes[jLayer];
2704 if(!(chamber = stack[bLayer])) continue;
f29f13a6 2705 bseed[bLayer].AttachClusters(chamber, kTRUE);
2706 bseed[bLayer].Fit(kTRUE);
41702fec 2707 if(bseed[bLayer].IsOK()) nLayers++;
2708 }
2709
2710 chi2 = FitTiltedRieman(bseed, kTRUE);
3a039a31 2711 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 7){
41702fec 2712 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2713 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2714 TLinearFitter *tiltedRieman = GetTiltedRiemanFitter();
29f95561 2715 TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
41702fec 2716 cstreamer << "ImproveSeedQuality"
2717 << "EventNumber=" << eventNumber
2718 << "CandidateNumber=" << candidateNumber
2719 << "Iteration=" << iter
2720 << "S0.=" << &bseed[0]
2721 << "S1.=" << &bseed[1]
2722 << "S2.=" << &bseed[2]
2723 << "S3.=" << &bseed[3]
2724 << "S4.=" << &bseed[4]
2725 << "S5.=" << &bseed[5]
2726 << "FitterT.=" << tiltedRieman
2727 << "\n";
2728 }
2729 } // Loop: iter
41702fec 2730 // we are sure that at least 2 tracklets are OK !
2731 return nLayers+2;
e4f2f73d 2732}
2733
eb38ed55 2734//_________________________________________________________________________
2735Double_t AliTRDtrackerV1::CalculateTrackLikelihood(AliTRDseedV1 *tracklets, Double_t *chi2){
41702fec 2736 //
2737 // Calculates the Track Likelihood value. This parameter serves as main quality criterion for
2738 // the track selection
2739 // The likelihood value containes:
2740 // - The chi2 values from the both fitters and the chi2 values in z-direction from a linear fit
2741 // - The Sum of the Parameter |slope_ref - slope_fit|/Sigma of the tracklets
2742 // For all Parameters an exponential dependency is used
2743 //
2744 // Parameters: - Array of tracklets (AliTRDseedV1) related to the track candidate
2745 // - Array of chi2 values:
2746 // * Non-Constrained Tilted Riemann fit
2747 // * Vertex-Constrained Tilted Riemann fit
2748 // * z-Direction from Linear fit
2749 // Output: - The calculated track likelihood
2750 //
2751 // debug level 2
2752 //
2753
f29f13a6 2754 Double_t chi2phi = 0, nLayers = 0;
41702fec 2755 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
2756 if(!tracklets[iLayer].IsOK()) continue;
f29f13a6 2757 chi2phi += tracklets[iLayer].GetChi2Phi();
41702fec 2758 nLayers++;
2759 }
f29f13a6 2760 chi2phi /= Float_t (nLayers - 2.0);
41702fec 2761
2762 Double_t likeChi2Z = TMath::Exp(-chi2[2] * 0.14); // Chi2Z
3a039a31 2763 Double_t likeChi2TC = (fReconstructor->GetRecoParam() ->IsVertexConstrained()) ?
d20df6fc 2764 TMath::Exp(-chi2[1] * 0.677) : 1; // Constrained Tilted Riemann
41702fec 2765 Double_t likeChi2TR = TMath::Exp(-chi2[0] * 0.78); // Non-constrained Tilted Riemann
f29f13a6 2766 Double_t likeChi2Phi= TMath::Exp(-chi2phi * 3.23);
2767 Double_t trackLikelihood = likeChi2Z * likeChi2TR * likeChi2Phi;
41702fec 2768
3a039a31 2769 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){
41702fec 2770 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2771 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
29f95561 2772 TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
41702fec 2773 cstreamer << "CalculateTrackLikelihood0"
2774 << "EventNumber=" << eventNumber
2775 << "CandidateNumber=" << candidateNumber
2776 << "LikeChi2Z=" << likeChi2Z
2777 << "LikeChi2TR=" << likeChi2TR
2778 << "LikeChi2TC=" << likeChi2TC
f29f13a6 2779 << "LikeChi2Phi=" << likeChi2Phi
41702fec 2780 << "TrackLikelihood=" << trackLikelihood
2781 << "\n";
2782 }
2783
2784 return trackLikelihood;
e4f2f73d 2785}
2786
2787//____________________________________________________________________
91834b8d 2788Double_t AliTRDtrackerV1::CookLikelihood(AliTRDseedV1 *cseed, Int_t planes[4])
e4f2f73d 2789{
41702fec 2790 //
2791 // Calculate the probability of this track candidate.
2792 //
2793 // Parameters :
2794 // cseeds : array of candidate tracklets
2795 // planes : array of seeding planes (see seeding configuration)
2796 // chi2 : chi2 values (on the Z and Y direction) from the rieman fit of the track.
2797 //
2798 // Output :
2799 // likelihood value
2800 //
2801 // Detailed description
2802 //
2803 // The track quality is estimated based on the following 4 criteria:
2804 // 1. precision of the rieman fit on the Y direction (likea)
2805 // 2. chi2 on the Y direction (likechi2y)
2806 // 3. chi2 on the Z direction (likechi2z)
2807 // 4. number of attached clusters compared to a reference value
2808 // (see AliTRDrecoParam::fkFindable) (likeN)
2809 //
2810 // The distributions for each type of probabilities are given below as of
2811 // (date). They have to be checked to assure consistency of estimation.
2812 //
2813
2814 // ratio of the total number of clusters/track which are expected to be found by the tracker.
91834b8d 2815 const AliTRDrecoParam *fRecoPars = fReconstructor->GetRecoParam();
41702fec 2816
91834b8d 2817 Double_t chi2y = GetChi2Y(&cseed[0]);
2818 Double_t chi2z = GetChi2Z(&cseed[0]);
2819
8ae98148 2820 Float_t nclusters = 0.;
41702fec 2821 Double_t sumda = 0.;
2822 for(UChar_t ilayer = 0; ilayer < 4; ilayer++){
2823 Int_t jlayer = planes[ilayer];
2824 nclusters += cseed[jlayer].GetN2();
e3cf3d02 2825 sumda += TMath::Abs(cseed[jlayer].GetYfit(1) - cseed[jlayer].GetYref(1));
41702fec 2826 }
8ae98148 2827 nclusters *= .25;
2828
5a2e200c 2829 Double_t likea = TMath::Exp(-sumda * fRecoPars->GetPhiSlope());
41702fec 2830 Double_t likechi2y = 0.0000000001;
5a2e200c 2831 if (fReconstructor->IsCosmic() || chi2y < fRecoPars->GetChi2YCut()) likechi2y += TMath::Exp(-TMath::Sqrt(chi2y) * fRecoPars->GetChi2YSlope());
2832 Double_t likechi2z = TMath::Exp(-chi2z * fRecoPars->GetChi2ZSlope());
8ae98148 2833 Double_t likeN = TMath::Exp(-(fRecoPars->GetNMeanClusters() - nclusters) / fRecoPars->GetNSigmaClusters());
41702fec 2834 Double_t like = likea * likechi2y * likechi2z * likeN;
2835
2836 // AliInfo(Form("sumda(%f) chi2[0](%f) chi2[1](%f) likea(%f) likechi2y(%f) likechi2z(%f) nclusters(%d) likeN(%f)", sumda, chi2[0], chi2[1], likea, likechi2y, likechi2z, nclusters, likeN));
3a039a31 2837 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){
41702fec 2838 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2839 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
91834b8d 2840 Int_t nTracklets = 0; Float_t mean_ncls = 0;
2841 for(Int_t iseed=0; iseed < kNPlanes; iseed++){
2842 if(!cseed[iseed].IsOK()) continue;
2843 nTracklets++;
2844 mean_ncls += cseed[iseed].GetN2();
2845 }
2846 if(nTracklets) mean_ncls /= nTracklets;
41702fec 2847 // The Debug Stream contains the seed
29f95561 2848 TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
41702fec 2849 cstreamer << "CookLikelihood"
2850 << "EventNumber=" << eventNumber
2851 << "CandidateNumber=" << candidateNumber
2852 << "tracklet0.=" << &cseed[0]
2853 << "tracklet1.=" << &cseed[1]
2854 << "tracklet2.=" << &cseed[2]
2855 << "tracklet3.=" << &cseed[3]
2856 << "tracklet4.=" << &cseed[4]
2857 << "tracklet5.=" << &cseed[5]
2858 << "sumda=" << sumda
91834b8d 2859 << "chi2y=" << chi2y
2860 << "chi2z=" << chi2z
41702fec 2861 << "likea=" << likea
2862 << "likechi2y=" << likechi2y
2863 << "likechi2z=" << likechi2z
2864 << "nclusters=" << nclusters
2865 << "likeN=" << likeN
2866 << "like=" << like
91834b8d 2867 << "meanncls=" << mean_ncls
41702fec 2868 << "\n";
2869 }
2870
2871 return like;
e4f2f73d 2872}
2873
e4f2f73d 2874//____________________________________________________________________
0906e73e 2875void AliTRDtrackerV1::GetSeedingConfig(Int_t iconfig, Int_t planes[4])
e4f2f73d 2876{
41702fec 2877 //
2878 // Map seeding configurations to detector planes.
2879 //
2880 // Parameters :
2881 // iconfig : configuration index
2882 // planes : member planes of this configuration. On input empty.
2883 //
2884 // Output :
2885 // planes : contains the planes which are defining the configuration
2886 //
2887 // Detailed description
2888 //
2889 // Here is the list of seeding planes configurations together with
2890 // their topological classification:
2891 //
2892 // 0 - 5432 TQ 0
2893 // 1 - 4321 TQ 0
2894 // 2 - 3210 TQ 0
2895 // 3 - 5321 TQ 1
2896 // 4 - 4210 TQ 1
2897 // 5 - 5431 TQ 1
2898 // 6 - 4320 TQ 1
2899 // 7 - 5430 TQ 2
2900 // 8 - 5210 TQ 2
2901 // 9 - 5421 TQ 3
2902 // 10 - 4310 TQ 3
2903 // 11 - 5410 TQ 4
2904 // 12 - 5420 TQ 5
2905 // 13 - 5320 TQ 5
2906 // 14 - 5310 TQ 5
2907 //
2908 // The topologic quality is modeled as follows:
2909 // 1. The general model is define by the equation:
2910 // p(conf) = exp(-conf/2)
2911 // 2. According to the topologic classification, configurations from the same
2912 // class are assigned the agerage value over the model values.
2913 // 3. Quality values are normalized.
2914 //
2915 // The topologic quality distribution as function of configuration is given below:
2916 //Begin_Html
2917 // <img src="gif/topologicQA.gif">
2918 //End_Html
2919 //
2920
2921 switch(iconfig){
2922 case 0: // 5432 TQ 0
2923 planes[0] = 2;
2924 planes[1] = 3;
2925 planes[2] = 4;
2926 planes[3] = 5;
2927 break;
2928 case 1: // 4321 TQ 0
2929 planes[0] = 1;
2930 planes[1] = 2;
2931 planes[2] = 3;
2932 planes[3] = 4;
2933 break;
2934 case 2: // 3210 TQ 0
2935 planes[0] = 0;
2936 planes[1] = 1;
2937 planes[2] = 2;
2938 planes[3] = 3;
2939 break;
2940 case 3: // 5321 TQ 1
2941 planes[0] = 1;
2942 planes[1] = 2;
2943 planes[2] = 3;
2944 planes[3] = 5;
2945 break;
2946 case 4: // 4210 TQ 1
2947 planes[0] = 0;
2948 planes[1] = 1;
2949 planes[2] = 2;
2950 planes[3] = 4;
2951 break;
2952 case 5: // 5431 TQ 1
2953 planes[0] = 1;
2954 planes[1] = 3;
2955 planes[2] = 4;
2956 planes[3] = 5;
2957 break;
2958 case 6: // 4320 TQ 1
2959 planes[0] = 0;
2960 planes[1] = 2;
2961 planes[2] = 3;
2962 planes[3] = 4;
2963 break;
2964 case 7: // 5430 TQ 2
2965 planes[0] = 0;
2966 planes[1] = 3;
2967 planes[2] = 4;
2968 planes[3] = 5;
2969 break;
2970 case 8: // 5210 TQ 2
2971 planes[0] = 0;
2972 planes[1] = 1;
2973 planes[2] = 2;
2974 planes[3] = 5;
2975 break;
2976 case 9: // 5421 TQ 3
2977 planes[0] = 1;
2978 planes[1] = 2;
2979 planes[2] = 4;
2980 planes[3] = 5;
2981 break;
2982 case 10: // 4310 TQ 3
2983 planes[0] = 0;
2984 planes[1] = 1;
2985 planes[2] = 3;
2986 planes[3] = 4;
2987 break;
2988 case 11: // 5410 TQ 4
2989 planes[0] = 0;
2990 planes[1] = 1;
2991 planes[2] = 4;
2992 planes[3] = 5;
2993 break;
2994 case 12: // 5420 TQ 5
2995 planes[0] = 0;
2996 planes[1] = 2;
2997 planes[2] = 4;
2998 planes[3] = 5;
2999 break;
3000 case 13: // 5320 TQ 5
3001 planes[0] = 0;
3002 planes[1] = 2;
3003 planes[2] = 3;
3004 planes[3] = 5;
3005 break;
3006 case 14: // 5310 TQ 5
3007 planes[0] = 0;
3008 planes[1] = 1;
3009 planes[2] = 3;
3010 planes[3] = 5;
3011 break;
3012 }
e4f2f73d 3013}
3014
3015//____________________________________________________________________
0906e73e 3016void AliTRDtrackerV1::GetExtrapolationConfig(Int_t iconfig, Int_t planes[2])
e4f2f73d 3017{
41702fec 3018 //
3019 // Returns the extrapolation planes for a seeding configuration.
3020 //
3021 // Parameters :
3022 // iconfig : configuration index
3023 // planes : planes which are not in this configuration. On input empty.
3024 //
3025 // Output :
3026 // planes : contains the planes which are not in the configuration
3027 //
3028 // Detailed description
3029 //
3030
3031 switch(iconfig){
3032 case 0: // 5432 TQ 0
3033 planes[0] = 1;
3034 planes[1] = 0;
3035 break;
3036 case 1: // 4321 TQ 0
3037 planes[0] = 5;
3038 planes[1] = 0;
3039 break;
3040 case 2: // 3210 TQ 0
3041 planes[0] = 4;
3042 planes[1] = 5;
3043 break;
3044 case 3: // 5321 TQ 1
3045 planes[0] = 4;
3046 planes[1] = 0;
3047 break;
3048 case 4: // 4210 TQ 1
3049 planes[0] = 5;
3050 planes[1] = 3;
3051 break;
3052 case 5: // 5431 TQ 1
3053 planes[0] = 2;
3054 planes[1] = 0;
3055 break;
3056 case 6: // 4320 TQ 1
3057 planes[0] = 5;
3058 planes[1] = 1;
3059 break;
3060 case 7: // 5430 TQ 2
3061 planes[0] = 2;
3062 planes[1] = 1;
3063 break;
3064 case 8: // 5210 TQ 2
3065 planes[0] = 4;
3066 planes[1] = 3;
3067 break;
3068 case 9: // 5421 TQ 3
3069 planes[0] = 3;
3070 planes[1] = 0;
3071 break;
3072 case 10: // 4310 TQ 3
3073 planes[0] = 5;
3074 planes[1] = 2;
3075 break;
3076 case 11: // 5410 TQ 4
3077 planes[0] = 3;
3078 planes[1] = 2;
3079 break;
3080 case 12: // 5420 TQ 5
3081 planes[0] = 3;
3082 planes[1] = 1;
3083 break;
3084 case 13: // 5320 TQ 5
3085 planes[0] = 4;
3086 planes[1] = 1;
3087 break;
3088 case 14: // 5310 TQ 5
3089 planes[0] = 4;
3090 planes[1] = 2;
3091 break;
3092 }
e4f2f73d 3093}
eb38ed55 3094
3095//____________________________________________________________________
3096AliCluster* AliTRDtrackerV1::GetCluster(Int_t idx) const
3097{
41702fec 3098 Int_t ncls = fClusters->GetEntriesFast();
2f7514a6 3099 return idx >= 0 && idx < ncls ? (AliCluster*)fClusters->UncheckedAt(idx) : 0x0;
eb38ed55 3100}
3101
3b57a3f7 3102//____________________________________________________________________
3103AliTRDseedV1* AliTRDtrackerV1::GetTracklet(Int_t idx) const
3104{
41702fec 3105 Int_t ntrklt = fTracklets->GetEntriesFast();
2f7514a6 3106 return idx >= 0 && idx < ntrklt ? (AliTRDseedV1*)fTracklets->UncheckedAt(idx) : 0x0;
3b57a3f7 3107}
3108
3109//____________________________________________________________________
3110AliKalmanTrack* AliTRDtrackerV1::GetTrack(Int_t idx) const
3111{
41702fec 3112 Int_t ntrk = fTracks->GetEntriesFast();
2f7514a6 3113 return idx >= 0 && idx < ntrk ? (AliKalmanTrack*)fTracks->UncheckedAt(idx) : 0x0;
3b57a3f7 3114}
3115
bb56afff 3116//____________________________________________________________________
3117Float_t AliTRDtrackerV1::CalculateReferenceX(AliTRDseedV1 *tracklets){
41702fec 3118 //
3119 // Calculates the reference x-position for the tilted Rieman fit defined as middle
3120 // of the stack (middle between layers 2 and 3). For the calculation all the tracklets
3121 // are taken into account
3122 //
3123 // Parameters: - Array of tracklets(AliTRDseedV1)
3124 //
3125 // Output: - The reference x-position(Float_t)
3126 //
3127 Int_t nDistances = 0;
3128 Float_t meanDistance = 0.;
3129 Int_t startIndex = 5;
3130 for(Int_t il =5; il > 0; il--){
3131 if(tracklets[il].IsOK() && tracklets[il -1].IsOK()){
3132 Float_t xdiff = tracklets[il].GetX0() - tracklets[il -1].GetX0();
3133 meanDistance += xdiff;
3134 nDistances++;
3135 }
3136 if(tracklets[il].IsOK()) startIndex = il;
3137 }
3138 if(tracklets[0].IsOK()) startIndex = 0;
3139 if(!nDistances){
3140 // We should normally never get here
3141 Float_t xpos[2]; memset(xpos, 0, sizeof(Float_t) * 2);
3142 Int_t iok = 0, idiff = 0;
3143 // This attempt is worse and should be avoided:
3144 // check for two chambers which are OK and repeat this without taking the mean value
3145 // Strategy avoids a division by 0;
3146 for(Int_t il = 5; il >= 0; il--){
3147 if(tracklets[il].IsOK()){
3148 xpos[iok] = tracklets[il].GetX0();
3149 iok++;
3150 startIndex = il;
3151 }
3152 if(iok) idiff++; // to get the right difference;
3153 if(iok > 1) break;
3154 }
3155 if(iok > 1){
3156 meanDistance = (xpos[0] - xpos[1])/idiff;
3157 }
3158 else{
3159 // we have do not even have 2 layers which are OK? The we do not need to fit at all
3160 return 331.;
3161 }
3162 }
3163 else{
3164 meanDistance /= nDistances;
3165 }
3166 return tracklets[startIndex].GetX0() + (2.5 - startIndex) * meanDistance - 0.5 * (AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick());
bb56afff 3167}
eb38ed55 3168
fac58f00 3169// //_____________________________________________________________________________
3170// Int_t AliTRDtrackerV1::Freq(Int_t n, const Int_t *inlist
3171// , Int_t *outlist, Bool_t down)
3172// {
3173// //
3174// // Sort eleements according occurancy
3175// // The size of output array has is 2*n
3176// //
3177//
3178// if (n <= 0) {
3179// return 0;
3180// }
3181//
3182// Int_t *sindexS = new Int_t[n]; // Temporary array for sorting
3183// Int_t *sindexF = new Int_t[2*n];
3184// for (Int_t i = 0; i < n; i++) {
3185// sindexF[i] = 0;
3186// }
3187//
3188// TMath::Sort(n,inlist,sindexS,down);
3189//
3190// Int_t last = inlist[sindexS[0]];
3191// Int_t val = last;
3192// sindexF[0] = 1;
3193// sindexF[0+n] = last;
3194// Int_t countPos = 0;
3195//
3196// // Find frequency
3197// for (Int_t i = 1; i < n; i++) {
3198// val = inlist[sindexS[i]];
3199// if (last == val) {
3200// sindexF[countPos]++;
3201// }
3202// else {
3203// countPos++;
3204// sindexF[countPos+n] = val;
3205// sindexF[countPos]++;
3206// last = val;
3207// }
3208// }
3209// if (last == val) {
3210// countPos++;
3211// }
3212//
3213// // Sort according frequency
3214// TMath::Sort(countPos,sindexF,sindexS,kTRUE);
3215//
3216// for (Int_t i = 0; i < countPos; i++) {
3217// outlist[2*i ] = sindexF[sindexS[i]+n];
3218// outlist[2*i+1] = sindexF[sindexS[i]];
3219// }
3220//
3221// delete [] sindexS;
3222// delete [] sindexF;
3223//
3224// return countPos;
3225//
3226// }
bb56afff 3227
06b32d95 3228
d611c74f 3229//____________________________________________________________________
3230void AliTRDtrackerV1::ResetSeedTB()
3231{
3232// reset buffer for seeding time bin layers. If the time bin
3233// layers are not allocated this function allocates them
3234
3235 for(Int_t isl=0; isl<kNSeedPlanes; isl++){
3236 if(!fSeedTB[isl]) fSeedTB[isl] = new AliTRDchamberTimeBin();
3237 else fSeedTB[isl]->Clear();
3238 }
3239}
3240
e3cf3d02 3241
3242//_____________________________________________________________________________
3243Float_t AliTRDtrackerV1::GetChi2Y(AliTRDseedV1 *tracklets) const
3244{
3245 // Calculates normalized chi2 in y-direction
3246 // chi2 = Sum chi2 / n_tracklets
3247
3248 Double_t chi2 = 0.; Int_t n = 0;
3249 for(Int_t ipl = kNPlanes; ipl--;){
3250 if(!tracklets[ipl].IsOK()) continue;
3251 chi2 += tracklets[ipl].GetChi2Y();
3252 n++;
3253 }
3254 return n ? chi2/n : 0.;
3255}
3256
bb56afff 3257//_____________________________________________________________________________
3258Float_t AliTRDtrackerV1::GetChi2Z(AliTRDseedV1 *tracklets) const
3259{
91834b8d 3260 // Calculates normalized chi2 in z-direction
e3cf3d02 3261 // chi2 = Sum chi2 / n_tracklets
41702fec 3262
e3cf3d02 3263 Double_t chi2 = 0; Int_t n = 0;
3264 for(Int_t ipl = kNPlanes; ipl--;){
41702fec 3265 if(!tracklets[ipl].IsOK()) continue;
e3cf3d02 3266 chi2 += tracklets[ipl].GetChi2Z();
3267 n++;
41702fec 3268 }
e3cf3d02 3269 return n ? chi2/n : 0.;
bb56afff 3270}
8acca6a3 3271
3272///////////////////////////////////////////////////////
3273// //
3274// Resources of class AliTRDLeastSquare //
3275// //
3276///////////////////////////////////////////////////////
3277
3278//_____________________________________________________________________________
3279AliTRDtrackerV1::AliTRDLeastSquare::AliTRDLeastSquare(){
41702fec 3280 //
3281 // Constructor of the nested class AliTRDtrackFitterLeastSquare
3282 //
3283 memset(fParams, 0, sizeof(Double_t) * 2);
3284 memset(fSums, 0, sizeof(Double_t) * 5);
3285 memset(fCovarianceMatrix, 0, sizeof(Double_t) * 3);
8acca6a3 3286
3287}
3288
3289//_____________________________________________________________________________
3290void AliTRDtrackerV1::AliTRDLeastSquare::AddPoint(Double_t *x, Double_t y, Double_t sigmaY){
41702fec 3291 //
3292 // Adding Point to the fitter
3293 //
3294 Double_t weight = 1/(sigmaY * sigmaY);
3295 Double_t &xpt = *x;
3296 // printf("Adding point x = %f, y = %f, sigma = %f\n", xpt, y, sigmaY);
3297 fSums[0] += weight;
3298 fSums[1] += weight * xpt;
3299 fSums[2] += weight * y;
3300 fSums[3] += weight * xpt * y;
3301 fSums[4] += weight * xpt * xpt;
3302 fSums[5] += weight * y * y;
8acca6a3 3303}
3304
3305//_____________________________________________________________________________
3306void AliTRDtrackerV1::AliTRDLeastSquare::RemovePoint(Double_t *x, Double_t y, Double_t sigmaY){
41702fec 3307 //
3308 // Remove Point from the sample
3309 //
3310 Double_t weight = 1/(sigmaY * sigmaY);
3311 Double_t &xpt = *x;
3312 fSums[0] -= weight;
3313 fSums[1] -= weight * xpt;
3314 fSums[2] -= weight * y;
3315 fSums[3] -= weight * xpt * y;
3316 fSums[4] -= weight * xpt * xpt;
3317 fSums[5] -= weight * y * y;
8acca6a3 3318}
3319
3320//_____________________________________________________________________________
3321void AliTRDtrackerV1::AliTRDLeastSquare::Eval(){
41702fec 3322 //
3323 // Evaluation of the fit:
3324 // Calculation of the parameters
3325 // Calculation of the covariance matrix
3326 //
3327
3328 Double_t denominator = fSums[0] * fSums[4] - fSums[1] *fSums[1];
aec26713 3329 if(denominator==0) return;
3330
41702fec 3331 // for(Int_t isum = 0; isum < 5; isum++)
3332 // printf("fSums[%d] = %f\n", isum, fSums[isum]);
3333 // printf("denominator = %f\n", denominator);
3334 fParams[0] = (fSums[2] * fSums[4] - fSums[1] * fSums[3])/ denominator;
3335 fParams[1] = (fSums[0] * fSums[3] - fSums[1] * fSums[2]) / denominator;
3336 // printf("fParams[0] = %f, fParams[1] = %f\n", fParams[0], fParams[1]);
3337
3338 // Covariance matrix
3339 fCovarianceMatrix[0] = fSums[4] - fSums[1] * fSums[1] / fSums[0];
3340 fCovarianceMatrix[1] = fSums[5] - fSums[2] * fSums[2] / fSums[0];
3341 fCovarianceMatrix[2] = fSums[3] - fSums[1] * fSums[2] / fSums[0];
8acca6a3 3342}
3343
46b6abd7 3344//_____________________________________________________________________________
3345Double_t AliTRDtrackerV1::AliTRDLeastSquare::GetFunctionValue(Double_t *xpos) const {
41702fec 3346 //
3347 // Returns the Function value of the fitted function at a given x-position
3348 //
3349 return fParams[0] + fParams[1] * (*xpos);
46b6abd7 3350}
3351
3352//_____________________________________________________________________________
3353void AliTRDtrackerV1::AliTRDLeastSquare::GetCovarianceMatrix(Double_t *storage) const {
41702fec 3354