fix warning for gcc 4.3.2
[u/mrichter/AliRoot.git] / TRD / AliTRDtrackerV1.cxx
CommitLineData
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
407 AliInfo(Form("Number of seeds: %d", nSeed));
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());
ae4e8b84 671 tracklet.SetDetector(chamber->GetDetector());
41702fec 672 tracklet.SetX0(x);
b1957d3c 673 tracklet.UpDate(&t);
674// if(!tracklet.Init(&t)){
675// t.SetStopped(kTRUE);
676// return nClustersExpected;
677// }
678 if(!tracklet.AttachClusters(chamber, kTRUE)) continue;
679 //if(!tracklet.AttachClustersIter(chamber, 1000.)) continue;
680 //tracklet.Init(&t);
41702fec 681
3a039a31 682 if(tracklet.GetN() < fgNTimeBins*fReconstructor->GetRecoParam() ->GetFindableClusters()) continue;
41702fec 683
684 break;
685 }
f29f13a6 686 ptrTracklet->UpdateUsed();
687 }
41702fec 688 if(!ptrTracklet->IsOK()){
f29f13a6 689 ptrTracklet->Reset();
41702fec 690 if(x < 1.) continue; //temporary
35c24814 691 if(!PropagateToX(t, x-fgkMaxStep, fgkMaxStep)) return -1/*nClustersExpected*/;
692 if(!AdjustSector(&t)) return -1/*nClustersExpected*/;
693 if(TMath::Abs(t.GetSnp()) > fgkMaxSnp) return -1/*nClustersExpected*/;
41702fec 694 continue;
695 }
696
697 // Propagate closer to the current chamber if neccessary
698 x -= clength;
35c24814 699 if (x > (fgkMaxStep + t.GetX()) && !PropagateToX(t, x-fgkMaxStep, fgkMaxStep)) return -1/*nClustersExpected*/;
700 if (!AdjustSector(&t)) return -1/*nClustersExpected*/;
701 if (TMath::Abs(t.GetSnp()) > fgkMaxSnp) return -1/*nClustersExpected*/;
41702fec 702
703 // load tracklet to the tracker and the track
f29f13a6 704 ptrTracklet->UseClusters();
b1957d3c 705 ptrTracklet->Fit(kFALSE); // no tilt correction
41702fec 706 ptrTracklet = SetTracklet(ptrTracklet);
707 t.SetTracklet(ptrTracklet, fTracklets->GetEntriesFast()-1);
708
709
710 // Calculate the mean material budget along the path inside the chamber
711 //Calculate global entry and exit positions of the track in chamber (only track prolongation)
712 Double_t xyz0[3]; // entry point
713 t.GetXYZ(xyz0);
714 alpha = t.GetAlpha();
e3cf3d02 715 x = ptrTracklet->GetX(); //GetX0();
35c24814 716 if (!t.GetProlongation(x, y, z)) return -1/*nClustersExpected*/;
41702fec 717 Double_t xyz1[3]; // exit point
718 xyz1[0] = x * TMath::Cos(alpha) - y * TMath::Sin(alpha);
719 xyz1[1] = +x * TMath::Sin(alpha) + y * TMath::Cos(alpha);
720 xyz1[2] = z;
721 Double_t param[7];
83dea92e 722 if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param)<=0.) return -1;
41702fec 723 // The mean propagation parameters
724 Double_t xrho = param[0]*param[4]; // density*length
725 Double_t xx0 = param[1]; // radiation length
726
727 // Propagate and update track
35c24814 728 if (!t.PropagateTo(x, xx0, xrho)) return -1/*nClustersExpected*/;
729 if (!AdjustSector(&t)) return -1/*nClustersExpected*/;
e3cf3d02 730
731 if(kStoreIn){
732 t.SetTrackLow();
733 kStoreIn = kFALSE;
734 }
41702fec 735 Double_t maxChi2 = t.GetPredictedChi2(ptrTracklet);
35c24814 736 if (!t.Update(ptrTracklet, maxChi2)) return -1/*nClustersExpected*/;
b1957d3c 737 ptrTracklet->UpDate(&t);
738
ae3fbe1f 739 if (maxChi2<1e+10) {
41702fec 740 nClustersExpected += ptrTracklet->GetN();
741 //t.SetTracklet(&tracklet, index);
742 }
743 // Reset material budget if 2 consecutive gold
053767a4 744 if(ilayer>0 && t.GetTracklet(ilayer-1) && ptrTracklet->GetN() + t.GetTracklet(ilayer-1)->GetN() > 20) t.SetBudget(2, 0.);
41702fec 745
746 // Make backup of the track until is gold
747 // TO DO update quality check of the track.
748 // consider comparison with fTimeBinsRange
749 Float_t ratio0 = ptrTracklet->GetN() / Float_t(fgNTimeBins);
750 //Float_t ratio1 = Float_t(t.GetNumberOfClusters()+1) / Float_t(t.GetNExpected()+1);
751 //printf("tracklet.GetChi2() %f [< 18.0]\n", tracklet.GetChi2());
752 //printf("ratio0 %f [> 0.8]\n", ratio0);
753 //printf("ratio1 %f [> 0.6]\n", ratio1);
754 //printf("ratio0+ratio1 %f [> 1.5]\n", ratio0+ratio1);
755 //printf("t.GetNCross() %d [== 0]\n", t.GetNCross());
756 //printf("TMath::Abs(t.GetSnp()) %f [< 0.85]\n", TMath::Abs(t.GetSnp()));
757 //printf("t.GetNumberOfClusters() %d [> 20]\n", t.GetNumberOfClusters());
758
759 if (//(tracklet.GetChi2() < 18.0) && TO DO check with FindClusters and move it to AliTRDseed::Update
760 (ratio0 > 0.8) &&
761 //(ratio1 > 0.6) &&
762 //(ratio0+ratio1 > 1.5) &&
763 (t.GetNCross() == 0) &&
764 (TMath::Abs(t.GetSnp()) < 0.85) &&
e3cf3d02 765 (t.GetNumberOfClusters() > 20)){
766 t.MakeBackupTrack();
767 }
053767a4 768 } // end layers loop
41702fec 769
3a039a31 770 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){
29f95561 771 TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
41702fec 772 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
773 //AliTRDtrackV1 *debugTrack = new AliTRDtrackV1(t);
774 //debugTrack->SetOwner();
775 cstreamer << "FollowBackProlongation"
776 << "EventNumber=" << eventNumber
777 << "ncl=" << nClustersExpected
778 //<< "track.=" << debugTrack
779 << "\n";
780 }
781
782 return nClustersExpected;
0906e73e 783}
784
eb38ed55 785//_________________________________________________________________________
786Float_t AliTRDtrackerV1::FitRieman(AliTRDseedV1 *tracklets, Double_t *chi2, Int_t *planes){
41702fec 787 //
788 // Fits a Riemann-circle to the given points without tilting pad correction.
789 // The fit is performed using an instance of the class AliRieman (equations
790 // and transformations see documentation of this class)
791 // Afterwards all the tracklets are Updated
792 //
793 // Parameters: - Array of tracklets (AliTRDseedV1)
794 // - Storage for the chi2 values (beginning with direction z)
795 // - Seeding configuration
796 // Output: - The curvature
797 //
798 AliRieman *fitter = AliTRDtrackerV1::GetRiemanFitter();
799 fitter->Reset();
800 Int_t allplanes[] = {0, 1, 2, 3, 4, 5};
801 Int_t *ppl = &allplanes[0];
802 Int_t maxLayers = 6;
803 if(planes){
804 maxLayers = 4;
805 ppl = planes;
806 }
807 for(Int_t il = 0; il < maxLayers; il++){
808 if(!tracklets[ppl[il]].IsOK()) continue;
e3cf3d02 809 fitter->AddPoint(tracklets[ppl[il]].GetX0(), tracklets[ppl[il]].GetYfit(0), tracklets[ppl[il]].GetZfit(0),1,10);
41702fec 810 }
811 fitter->Update();
812 // Set the reference position of the fit and calculate the chi2 values
813 memset(chi2, 0, sizeof(Double_t) * 2);
814 for(Int_t il = 0; il < maxLayers; il++){
815 // Reference positions
816 tracklets[ppl[il]].Init(fitter);
817
818 // chi2
819 if((!tracklets[ppl[il]].IsOK()) && (!planes)) continue;
820 chi2[0] += tracklets[ppl[il]].GetChi2Y();
821 chi2[1] += tracklets[ppl[il]].GetChi2Z();
822 }
823 return fitter->GetC();
eb38ed55 824}
825
826//_________________________________________________________________________
827void AliTRDtrackerV1::FitRieman(AliTRDcluster **seedcl, Double_t chi2[2])
828{
41702fec 829 //
830 // Performs a Riemann helix fit using the seedclusters as spacepoints
831 // Afterwards the chi2 values are calculated and the seeds are updated
832 //
833 // Parameters: - The four seedclusters
834 // - The tracklet array (AliTRDseedV1)
835 // - The seeding configuration
836 // - Chi2 array
837 //
838 // debug level 2
839 //
840 AliRieman *fitter = AliTRDtrackerV1::GetRiemanFitter();
841 fitter->Reset();
842 for(Int_t i = 0; i < 4; i++)
843 fitter->AddPoint(seedcl[i]->GetX(), seedcl[i]->GetY(), seedcl[i]->GetZ(), 1, 10);
844 fitter->Update();
845
846
847 // Update the seed and calculated the chi2 value
848 chi2[0] = 0; chi2[1] = 0;
849 for(Int_t ipl = 0; ipl < kNSeedPlanes; ipl++){
850 // chi2
851 chi2[0] += (seedcl[ipl]->GetZ() - fitter->GetZat(seedcl[ipl]->GetX())) * (seedcl[ipl]->GetZ() - fitter->GetZat(seedcl[ipl]->GetX()));
852 chi2[1] += (seedcl[ipl]->GetY() - fitter->GetYat(seedcl[ipl]->GetX())) * (seedcl[ipl]->GetY() - fitter->GetYat(seedcl[ipl]->GetX()));
853 }
eb38ed55 854}
855
856
857//_________________________________________________________________________
858Float_t AliTRDtrackerV1::FitTiltedRiemanConstraint(AliTRDseedV1 *tracklets, Double_t zVertex)
859{
41702fec 860 //
861 // Fits a helix to the clusters. Pad tilting is considered. As constraint it is
862 // assumed that the vertex position is set to 0.
863 // This method is very usefull for high-pt particles
864 // Basis for the fit: (x - x0)^2 + (y - y0)^2 - R^2 = 0
865 // x0, y0: Center of the circle
866 // Measured y-position: ymeas = y - tan(phiT)(zc - zt)
867 // zc: center of the pad row
868 // Equation which has to be fitted (after transformation):
869 // a + b * u + e * v + 2*(ymeas + tan(phiT)(z - zVertex))*t = 0
870 // Transformation:
871 // t = 1/(x^2 + y^2)
872 // u = 2 * x * t
873 // v = 2 * x * tan(phiT) * t
874 // Parameters in the equation:
875 // a = -1/y0, b = x0/y0, e = dz/dx
876 //
877 // The Curvature is calculated by the following equation:
878 // - curv = a/Sqrt(b^2 + 1) = 1/R
879 // Parameters: - the 6 tracklets
880 // - the Vertex constraint
881 // Output: - the Chi2 value of the track
882 //
883 // debug level 5
884 //
885
886 TLinearFitter *fitter = GetTiltedRiemanFitterConstraint();
887 fitter->StoreData(kTRUE);
888 fitter->ClearPoints();
889 AliTRDcluster *cl = 0x0;
890
891 Float_t x, y, z, w, t, error, tilt;
892 Double_t uvt[2];
893 Int_t nPoints = 0;
053767a4 894 for(Int_t ilr = 0; ilr < AliTRDgeometry::kNlayer; ilr++){
895 if(!tracklets[ilr].IsOK()) continue;
8d2bec9e 896 for(Int_t itb = 0; itb < AliTRDseedV1::kNclusters; itb++){
053767a4 897 if(!tracklets[ilr].IsUsable(itb)) continue;
898 cl = tracklets[ilr].GetClusters(itb);
41702fec 899 x = cl->GetX();
900 y = cl->GetY();
901 z = cl->GetZ();
053767a4 902 tilt = tracklets[ilr].GetTilt();
41702fec 903 // Transformation
904 t = 1./(x * x + y * y);
905 uvt[0] = 2. * x * t;
906 uvt[1] = 2. * x * t * tilt ;
907 w = 2. * (y + tilt * (z - zVertex)) * t;
f29f13a6 908 error = 2. * TMath::Sqrt(cl->GetSigmaY2()) * t;
41702fec 909 fitter->AddPoint(uvt, w, error);
910 nPoints++;
911 }
912 }
913 fitter->Eval();
914
915 // Calculate curvature
916 Double_t a = fitter->GetParameter(0);
917 Double_t b = fitter->GetParameter(1);
918 Double_t curvature = a/TMath::Sqrt(b*b + 1);
919
920 Float_t chi2track = fitter->GetChisquare()/Double_t(nPoints);
921 for(Int_t ip = 0; ip < AliTRDtrackerV1::kNPlanes; ip++)
e3cf3d02 922 tracklets[ip].SetC(curvature);
41702fec 923
3a039a31 924/* if(fReconstructor->GetStreamLevel() >= 5){
41702fec 925 //Linear Model on z-direction
926 Double_t xref = CalculateReferenceX(tracklets); // Relative to the middle of the stack
927 Double_t slope = fitter->GetParameter(2);
928 Double_t zref = slope * xref;
929 Float_t chi2Z = CalculateChi2Z(tracklets, zref, slope, xref);
930 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
931 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
29f95561 932 TTreeSRedirector &treeStreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
41702fec 933 treeStreamer << "FitTiltedRiemanConstraint"
934 << "EventNumber=" << eventNumber
935 << "CandidateNumber=" << candidateNumber
936 << "Curvature=" << curvature
937 << "Chi2Track=" << chi2track
938 << "Chi2Z=" << chi2Z
939 << "zref=" << zref
940 << "\n";
3a039a31 941 }*/
41702fec 942 return chi2track;
eb38ed55 943}
944
945//_________________________________________________________________________
946Float_t AliTRDtrackerV1::FitTiltedRieman(AliTRDseedV1 *tracklets, Bool_t sigError)
947{
41702fec 948 //
949 // Performs a Riemann fit taking tilting pad correction into account
950 // The equation of a Riemann circle, where the y position is substituted by the
951 // measured y-position taking pad tilting into account, has to be transformed
952 // into a 4-dimensional hyperplane equation
953 // Riemann circle: (x-x0)^2 + (y-y0)^2 -R^2 = 0
954 // Measured y-Position: ymeas = y - tan(phiT)(zc - zt)
955 // zc: center of the pad row
956 // zt: z-position of the track
957 // The z-position of the track is assumed to be linear dependent on the x-position
958 // Transformed equation: a + b * u + c * t + d * v + e * w - 2 * (ymeas + tan(phiT) * zc) * t = 0
959 // Transformation: u = 2 * x * t
960 // v = 2 * tan(phiT) * t
961 // w = 2 * tan(phiT) * (x - xref) * t
962 // t = 1 / (x^2 + ymeas^2)
963 // Parameters: a = -1/y0
964 // b = x0/y0
965 // c = (R^2 -x0^2 - y0^2)/y0
966 // d = offset
967 // e = dz/dx
968 // If the offset respectively the slope in z-position is impossible, the parameters are fixed using
969 // results from the simple riemann fit. Afterwards the fit is redone.
970 // The curvature is calculated according to the formula:
971 // curv = a/(1 + b^2 + c*a) = 1/R
972 //
973 // Paramters: - Array of tracklets (connected to the track candidate)
974 // - Flag selecting the error definition
975 // Output: - Chi2 values of the track (in Parameter list)
976 //
977 TLinearFitter *fitter = GetTiltedRiemanFitter();
978 fitter->StoreData(kTRUE);
979 fitter->ClearPoints();
980 AliTRDLeastSquare zfitter;
981 AliTRDcluster *cl = 0x0;
982
983 Double_t xref = CalculateReferenceX(tracklets);
984 Double_t x, y, z, t, tilt, dx, w, we;
985 Double_t uvt[4];
986 Int_t nPoints = 0;
987 // Containers for Least-square fitter
988 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
989 if(!tracklets[ipl].IsOK()) continue;
8d2bec9e 990 for(Int_t itb = 0; itb < AliTRDseedV1::kNclusters; itb++){
41702fec 991 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
992 if (!tracklets[ipl].IsUsable(itb)) continue;
993 x = cl->GetX();
994 y = cl->GetY();
995 z = cl->GetZ();
996 tilt = tracklets[ipl].GetTilt();
997 dx = x - xref;
998 // Transformation
999 t = 1./(x*x + y*y);
1000 uvt[0] = 2. * x * t;
1001 uvt[1] = t;
1002 uvt[2] = 2. * tilt * t;
1003 uvt[3] = 2. * tilt * dx * t;
1004 w = 2. * (y + tilt*z) * t;
1005 // error definition changes for the different calls
1006 we = 2. * t;
f29f13a6 1007 we *= sigError ? TMath::Sqrt(cl->GetSigmaY2()) : 0.2;
41702fec 1008 fitter->AddPoint(uvt, w, we);
1009 zfitter.AddPoint(&x, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
1010 nPoints++;
1011 }
1012 }
1013 fitter->Eval();
1014 zfitter.Eval();
1015
1016 Double_t offset = fitter->GetParameter(3);
1017 Double_t slope = fitter->GetParameter(4);
1018
1019 // Linear fitter - not possible to make boundaries
1020 // Do not accept non possible z and dzdx combinations
1021 Bool_t acceptablez = kTRUE;
1022 Double_t zref = 0.0;
1023 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
1024 if(!tracklets[iLayer].IsOK()) continue;
1025 zref = offset + slope * (tracklets[iLayer].GetX0() - xref);
e3cf3d02 1026 if (TMath::Abs(tracklets[iLayer].GetZfit(0) - zref) > tracklets[iLayer].GetPadLength() * 0.5 + 1.0)
41702fec 1027 acceptablez = kFALSE;
1028 }
1029 if (!acceptablez) {
1030 Double_t dzmf = zfitter.GetFunctionParameter(1);
1031 Double_t zmf = zfitter.GetFunctionValue(&xref);
1032 fgTiltedRieman->FixParameter(3, zmf);
1033 fgTiltedRieman->FixParameter(4, dzmf);
1034 fitter->Eval();
1035 fitter->ReleaseParameter(3);
1036 fitter->ReleaseParameter(4);
1037 offset = fitter->GetParameter(3);
1038 slope = fitter->GetParameter(4);
1039 }
1040
1041 // Calculate Curvarture
1042 Double_t a = fitter->GetParameter(0);
1043 Double_t b = fitter->GetParameter(1);
1044 Double_t c = fitter->GetParameter(2);
1045 Double_t curvature = 1.0 + b*b - c*a;
1046 if (curvature > 0.0)
1047 curvature = a / TMath::Sqrt(curvature);
1048
1049 Double_t chi2track = fitter->GetChisquare()/Double_t(nPoints);
1050
1051 // Update the tracklets
1052 Double_t dy, dz;
1053 for(Int_t iLayer = 0; iLayer < AliTRDtrackerV1::kNPlanes; iLayer++) {
1054
1055 x = tracklets[iLayer].GetX0();
1056 y = 0;
1057 z = 0;
1058 dy = 0;
1059 dz = 0;
1060
1061 // y: R^2 = (x - x0)^2 + (y - y0)^2
1062 // => y = y0 +/- Sqrt(R^2 - (x - x0)^2)
1063 // R = Sqrt() = 1/Curvature
1064 // => y = y0 +/- Sqrt(1/Curvature^2 - (x - x0)^2)
1065 Double_t res = (x * a + b); // = (x - x0)/y0
1066 res *= res;
1067 res = 1.0 - c * a + b * b - res; // = (R^2 - (x - x0)^2)/y0^2
1068 if (res >= 0) {
1069 res = TMath::Sqrt(res);
1070 y = (1.0 - res) / a;
1071 }
1072
1073 // dy: R^2 = (x - x0)^2 + (y - y0)^2
1074 // => y = +/- Sqrt(R^2 - (x - x0)^2) + y0
1075 // => dy/dx = (x - x0)/Sqrt(R^2 - (x - x0)^2)
1076 // Curvature: cr = 1/R = a/Sqrt(1 + b^2 - c*a)
1077 // => dy/dx = (x - x0)/(1/(cr^2) - (x - x0)^2)
1078 Double_t x0 = -b / a;
1079 if (-c * a + b * b + 1 > 0) {
1080 if (1.0/(curvature * curvature) - (x - x0) * (x - x0) > 0.0) {
1081 Double_t yderiv = (x - x0) / TMath::Sqrt(1.0/(curvature * curvature) - (x - x0) * (x - x0));
1082 if (a < 0) yderiv *= -1.0;
1083 dy = yderiv;
1084 }
1085 }
1086 z = offset + slope * (x - xref);
1087 dz = slope;
1088 tracklets[iLayer].SetYref(0, y);
1089 tracklets[iLayer].SetYref(1, dy);
1090 tracklets[iLayer].SetZref(0, z);
1091 tracklets[iLayer].SetZref(1, dz);
1092 tracklets[iLayer].SetC(curvature);
1093 tracklets[iLayer].SetChi2(chi2track);
1094 }
1095
3a039a31 1096/* if(fReconstructor->GetStreamLevel() >=5){
29f95561 1097 TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
41702fec 1098 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
1099 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
1100 Double_t chi2z = CalculateChi2Z(tracklets, offset, slope, xref);
1101 cstreamer << "FitTiltedRieman0"
1102 << "EventNumber=" << eventNumber
1103 << "CandidateNumber=" << candidateNumber
1104 << "xref=" << xref
1105 << "Chi2Z=" << chi2z
1106 << "\n";
3a039a31 1107 }*/
41702fec 1108 return chi2track;
eb38ed55 1109}
1110
3b57a3f7 1111
9e333711 1112//____________________________________________________________________
6e4d4425 1113Double_t AliTRDtrackerV1::FitLine(const AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t err, Int_t np, AliTrackPoint *points)
9e333711 1114{
1115 AliTRDLeastSquare yfitter, zfitter;
1116 AliTRDcluster *cl = 0x0;
1117
1118 AliTRDseedV1 work[kNPlanes], *tracklet = 0x0;
1119 if(!tracklets){
1120 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1121 if(!(tracklet = track->GetTracklet(ipl))) continue;
1122 if(!tracklet->IsOK()) continue;
1123 new(&work[ipl]) AliTRDseedV1(*tracklet);
1124 }
1125 tracklets = &work[0];
1126 }
1127
1128 Double_t xref = CalculateReferenceX(tracklets);
1129 Double_t x, y, z, dx, ye, yr, tilt;
1130 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1131 if(!tracklets[ipl].IsOK()) continue;
1132 for(Int_t itb = 0; itb < fgNTimeBins; itb++){
1133 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1134 if (!tracklets[ipl].IsUsable(itb)) continue;
1135 x = cl->GetX();
1136 z = cl->GetZ();
1137 dx = x - xref;
1138 zfitter.AddPoint(&dx, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
1139 }
1140 }
1141 zfitter.Eval();
1142 Double_t z0 = zfitter.GetFunctionParameter(0);
1143 Double_t dzdx = zfitter.GetFunctionParameter(1);
1144 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1145 if(!tracklets[ipl].IsOK()) continue;
1146 for(Int_t itb = 0; itb < fgNTimeBins; itb++){
1147 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1148 if (!tracklets[ipl].IsUsable(itb)) continue;
1149 x = cl->GetX();
1150 y = cl->GetY();
1151 z = cl->GetZ();
1152 tilt = tracklets[ipl].GetTilt();
1153 dx = x - xref;
1154 yr = y + tilt*(z - z0 - dzdx*dx);
1155 // error definition changes for the different calls
1156 ye = tilt*TMath::Sqrt(cl->GetSigmaZ2());
1157 ye += err ? tracklets[ipl].GetSigmaY() : 0.2;
1158 yfitter.AddPoint(&dx, yr, ye);
1159 }
1160 }
1161 yfitter.Eval();
1162 Double_t y0 = yfitter.GetFunctionParameter(0);
1163 Double_t dydx = yfitter.GetFunctionParameter(1);
1164 Double_t chi2 = 0.;//yfitter.GetChisquare()/Double_t(nPoints);
1165
1166 //update track points array
1167 if(np && points){
1168 Float_t xyz[3];
1169 for(int ip=0; ip<np; ip++){
1170 points[ip].GetXYZ(xyz);
1171 xyz[1] = y0 + dydx * (xyz[0] - xref);
1172 xyz[2] = z0 + dzdx * (xyz[0] - xref);
1173 points[ip].SetXYZ(xyz);
1174 }
1175 }
1176 return chi2;
1177}
1178
1179
3b57a3f7 1180//_________________________________________________________________________
6e4d4425 1181Double_t AliTRDtrackerV1::FitRiemanTilt(const AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t sigError, Int_t np, AliTrackPoint *points)
3b57a3f7 1182{
41702fec 1183 //
1184 // Performs a Riemann fit taking tilting pad correction into account
1185 // The equation of a Riemann circle, where the y position is substituted by the
1186 // measured y-position taking pad tilting into account, has to be transformed
1187 // into a 4-dimensional hyperplane equation
1188 // Riemann circle: (x-x0)^2 + (y-y0)^2 -R^2 = 0
1189 // Measured y-Position: ymeas = y - tan(phiT)(zc - zt)
1190 // zc: center of the pad row
1191 // zt: z-position of the track
1192 // The z-position of the track is assumed to be linear dependent on the x-position
1193 // Transformed equation: a + b * u + c * t + d * v + e * w - 2 * (ymeas + tan(phiT) * zc) * t = 0
1194 // Transformation: u = 2 * x * t
1195 // v = 2 * tan(phiT) * t
1196 // w = 2 * tan(phiT) * (x - xref) * t
1197 // t = 1 / (x^2 + ymeas^2)
1198 // Parameters: a = -1/y0
1199 // b = x0/y0
1200 // c = (R^2 -x0^2 - y0^2)/y0
1201 // d = offset
1202 // e = dz/dx
1203 // If the offset respectively the slope in z-position is impossible, the parameters are fixed using
1204 // results from the simple riemann fit. Afterwards the fit is redone.
1205 // The curvature is calculated according to the formula:
1206 // curv = a/(1 + b^2 + c*a) = 1/R
1207 //
1208 // Paramters: - Array of tracklets (connected to the track candidate)
1209 // - Flag selecting the error definition
1210 // Output: - Chi2 values of the track (in Parameter list)
1211 //
1212 TLinearFitter *fitter = GetTiltedRiemanFitter();
1213 fitter->StoreData(kTRUE);
1214 fitter->ClearPoints();
1215 AliTRDLeastSquare zfitter;
1216 AliTRDcluster *cl = 0x0;
3b57a3f7 1217
1218 AliTRDseedV1 work[kNPlanes], *tracklet = 0x0;
1219 if(!tracklets){
1220 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1221 if(!(tracklet = track->GetTracklet(ipl))) continue;
1222 if(!tracklet->IsOK()) continue;
1223 new(&work[ipl]) AliTRDseedV1(*tracklet);
1224 }
1225 tracklets = &work[0];
1226 }
1227
41702fec 1228 Double_t xref = CalculateReferenceX(tracklets);
1229 Double_t x, y, z, t, tilt, dx, w, we;
1230 Double_t uvt[4];
1231 Int_t nPoints = 0;
1232 // Containers for Least-square fitter
1233 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1234 if(!tracklets[ipl].IsOK()) continue;
8d2bec9e 1235 for(Int_t itb = 0; itb < AliTRDseedV1::kNclusters; itb++){
41702fec 1236 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1237 if (!tracklets[ipl].IsUsable(itb)) continue;
1238 x = cl->GetX();
1239 y = cl->GetY();
1240 z = cl->GetZ();
1241 tilt = tracklets[ipl].GetTilt();
1242 dx = x - xref;
1243 // Transformation
1244 t = 1./(x*x + y*y);
1245 uvt[0] = 2. * x * t;
1246 uvt[1] = t;
1247 uvt[2] = 2. * tilt * t;
1248 uvt[3] = 2. * tilt * dx * t;
1249 w = 2. * (y + tilt*z) * t;
1250 // error definition changes for the different calls
1251 we = 2. * t;
f29f13a6 1252 we *= sigError ? TMath::Sqrt(cl->GetSigmaY2()) : 0.2;
41702fec 1253 fitter->AddPoint(uvt, w, we);
1254 zfitter.AddPoint(&x, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
1255 nPoints++;
1256 }
1257 }
aec26713 1258 if(fitter->Eval()) return 1.E10;
1259
41702fec 1260 Double_t z0 = fitter->GetParameter(3);
1261 Double_t dzdx = fitter->GetParameter(4);
3b57a3f7 1262
1263
1264 // Linear fitter - not possible to make boundaries
1265 // Do not accept non possible z and dzdx combinations
1266 Bool_t accept = kTRUE;
1267 Double_t zref = 0.0;
1268 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
1269 if(!tracklets[iLayer].IsOK()) continue;
1270 zref = z0 + dzdx * (tracklets[iLayer].GetX0() - xref);
e3cf3d02 1271 if (TMath::Abs(tracklets[iLayer].GetZfit(0) - zref) > tracklets[iLayer].GetPadLength() * 0.5 + 1.0)
3b57a3f7 1272 accept = kFALSE;
1273 }
1274 if (!accept) {
41702fec 1275 zfitter.Eval();
3b57a3f7 1276 Double_t dzmf = zfitter.GetFunctionParameter(1);
1277 Double_t zmf = zfitter.GetFunctionValue(&xref);
1278 fitter->FixParameter(3, zmf);
1279 fitter->FixParameter(4, dzmf);
1280 fitter->Eval();
1281 fitter->ReleaseParameter(3);
1282 fitter->ReleaseParameter(4);
1283 z0 = fitter->GetParameter(3); // = zmf ?
1284 dzdx = fitter->GetParameter(4); // = dzmf ?
1285 }
1286
1287 // Calculate Curvature
1288 Double_t a = fitter->GetParameter(0);
1289 Double_t b = fitter->GetParameter(1);
1290 Double_t c = fitter->GetParameter(2);
1291 Double_t y0 = 1. / a;
1292 Double_t x0 = -b * y0;
a015e406 1293 Double_t tmp = y0*y0 + x0*x0 - c*y0;
1294 if(tmp<=0.) return 1.E10;
1295 Double_t R = TMath::Sqrt(tmp);
3b57a3f7 1296 Double_t C = 1.0 + b*b - c*a;
1297 if (C > 0.0) C = a / TMath::Sqrt(C);
1298
1299 // Calculate chi2 of the fit
1300 Double_t chi2 = fitter->GetChisquare()/Double_t(nPoints);
1301
1302 // Update the tracklets
1303 if(!track){
1304 for(Int_t ip = 0; ip < kNPlanes; ip++) {
1305 x = tracklets[ip].GetX0();
90cf7133 1306 tmp = R*R-(x-x0)*(x-x0);
a015e406 1307 if(tmp <= 0.) continue;
1308 tmp = TMath::Sqrt(tmp);
3b57a3f7 1309
1310 // y: R^2 = (x - x0)^2 + (y - y0)^2
1311 // => y = y0 +/- Sqrt(R^2 - (x - x0)^2)
1312 tracklets[ip].SetYref(0, y0 - (y0>0.?1.:-1)*tmp);
1313 // => dy/dx = (x - x0)/Sqrt(R^2 - (x - x0)^2)
1314 tracklets[ip].SetYref(1, (x - x0) / tmp);
1315 tracklets[ip].SetZref(0, z0 + dzdx * (x - xref));
1316 tracklets[ip].SetZref(1, dzdx);
1317 tracklets[ip].SetC(C);
1318 tracklets[ip].SetChi2(chi2);
1319 }
1320 }
3b57a3f7 1321 //update track points array
1322 if(np && points){
1323 Float_t xyz[3];
1324 for(int ip=0; ip<np; ip++){
1325 points[ip].GetXYZ(xyz);
60e55aee 1326 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 1327 xyz[2] = z0 + dzdx * (xyz[0] - xref);
1328 points[ip].SetXYZ(xyz);
1329 }
1330 }
1331
3b57a3f7 1332 return chi2;
1333}
1334
1335
1bf51039 1336//____________________________________________________________________
1337Double_t AliTRDtrackerV1::FitKalman(AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t up, Int_t np, AliTrackPoint *points)
1338{
1339// Kalman filter implementation for the TRD.
1340// It returns the positions of the fit in the array "points"
1341//
1342// Author : A.Bercuci@gsi.de
1343
3cfaffa4 1344 // printf("Start track @ x[%f]\n", track->GetX());
1bf51039 1345
1346 //prepare marker points along the track
1347 Int_t ip = np ? 0 : 1;
1348 while(ip<np){
1349 if((up?-1:1) * (track->GetX() - points[ip].GetX()) > 0.) break;
1350 //printf("AliTRDtrackerV1::FitKalman() : Skip track marker x[%d] = %7.3f. Before track start ( %7.3f ).\n", ip, points[ip].GetX(), track->GetX());
1351 ip++;
1352 }
1353 //if(points) printf("First marker point @ x[%d] = %f\n", ip, points[ip].GetX());
1354
1355
1356 AliTRDseedV1 tracklet, *ptrTracklet = 0x0;
1357
1358 //Loop through the TRD planes
1359 for (Int_t jplane = 0; jplane < kNPlanes; jplane++) {
1360 // GET TRACKLET OR BUILT IT
1361 Int_t iplane = up ? jplane : kNPlanes - 1 - jplane;
1362 if(tracklets){
1363 if(!(ptrTracklet = &tracklets[iplane])) continue;
1364 }else{
1365 if(!(ptrTracklet = track->GetTracklet(iplane))){
1366 /*AliTRDtrackerV1 *tracker = 0x0;
1367 if(!(tracker = dynamic_cast<AliTRDtrackerV1*>( AliTRDReconstructor::Tracker()))) continue;
1368 ptrTracklet = new(&tracklet) AliTRDseedV1(iplane);
1369 if(!tracker->MakeTracklet(ptrTracklet, track)) */
1370 continue;
1371 }
1372 }
1373 if(!ptrTracklet->IsOK()) continue;
1374
1375 Double_t x = ptrTracklet->GetX0();
1376
1377 while(ip < np){
1378 //don't do anything if next marker is after next update point.
1379 if((up?-1:1) * (points[ip].GetX() - x) - fgkMaxStep < 0) break;
1bf51039 1380 if(((up?-1:1) * (points[ip].GetX() - track->GetX()) < 0) && !PropagateToX(*track, points[ip].GetX(), fgkMaxStep)) return -1.;
1381
1382 Double_t xyz[3]; // should also get the covariance
3cfaffa4 1383 track->GetXYZ(xyz);
1384 track->Global2LocalPosition(xyz, track->GetAlpha());
1385 points[ip].SetXYZ(xyz[0], xyz[1], xyz[2]);
1bf51039 1386 ip++;
1387 }
3cfaffa4 1388 // printf("plane[%d] tracklet[%p] x[%f]\n", iplane, ptrTracklet, x);
1bf51039 1389
3cfaffa4 1390 // Propagate closer to the next update point
1bf51039 1391 if(((up?-1:1) * (x - track->GetX()) + fgkMaxStep < 0) && !PropagateToX(*track, x + (up?-1:1)*fgkMaxStep, fgkMaxStep)) return -1.;
1392
1393 if(!AdjustSector(track)) return -1;
1394 if(TMath::Abs(track->GetSnp()) > fgkMaxSnp) return -1;
1395
1396 //load tracklet to the tracker and the track
1397/* Int_t index;
1398 if((index = FindTracklet(ptrTracklet)) < 0){
1399 ptrTracklet = SetTracklet(&tracklet);
1400 index = fTracklets->GetEntriesFast()-1;
1401 }
1402 track->SetTracklet(ptrTracklet, index);*/
1403
1404
1405 // register tracklet to track with tracklet creation !!
1406 // PropagateBack : loaded tracklet to the tracker and update index
1407 // RefitInward : update index
1408 // MakeTrack : loaded tracklet to the tracker and update index
1409 if(!tracklets) track->SetTracklet(ptrTracklet, -1);
1410
1411
1412 //Calculate the mean material budget along the path inside the chamber
1413 Double_t xyz0[3]; track->GetXYZ(xyz0);
1414 Double_t alpha = track->GetAlpha();
1415 Double_t xyz1[3], y, z;
1416 if(!track->GetProlongation(x, y, z)) return -1;
1417 xyz1[0] = x * TMath::Cos(alpha) - y * TMath::Sin(alpha);
1418 xyz1[1] = +x * TMath::Sin(alpha) + y * TMath::Cos(alpha);
1419 xyz1[2] = z;
3cfaffa4 1420 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 1421 Double_t param[7];
3cfaffa4 1422 if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param) <=0.) break;
1bf51039 1423 Double_t xrho = param[0]*param[4]; // density*length
1424 Double_t xx0 = param[1]; // radiation length
1425
1426 //Propagate the track
1427 track->PropagateTo(x, xx0, xrho);
1428 if (!AdjustSector(track)) break;
1429
1430 //Update track
1431 Double_t chi2 = track->GetPredictedChi2(ptrTracklet);
1432 if(chi2<1e+10) track->Update(ptrTracklet, chi2);
1bf51039 1433 if(!up) continue;
1434
1435 //Reset material budget if 2 consecutive gold
1436 if(iplane>0 && track->GetTracklet(iplane-1) && ptrTracklet->GetN() + track->GetTracklet(iplane-1)->GetN() > 20) track->SetBudget(2, 0.);
1437 } // end planes loop
1438
1439 // extrapolation
1440 while(ip < np){
1441 if(((up?-1:1) * (points[ip].GetX() - track->GetX()) < 0) && !PropagateToX(*track, points[ip].GetX(), fgkMaxStep)) return -1.;
1442
1443 Double_t xyz[3]; // should also get the covariance
3cfaffa4 1444 track->GetXYZ(xyz);
1445 track->Global2LocalPosition(xyz, track->GetAlpha());
1446 points[ip].SetXYZ(xyz[0], xyz[1], xyz[2]);
1bf51039 1447 ip++;
1448 }
1449
1450 return track->GetChi2();
1451}
3b57a3f7 1452
eb38ed55 1453//_________________________________________________________________________
bb56afff 1454Float_t AliTRDtrackerV1::CalculateChi2Z(AliTRDseedV1 *tracklets, Double_t offset, Double_t slope, Double_t xref)
eb38ed55 1455{
41702fec 1456 //
1457 // Calculates the chi2-value of the track in z-Direction including tilting pad correction.
1458 // A linear dependence on the x-value serves as a model.
1459 // The parameters are related to the tilted Riemann fit.
1460 // Parameters: - Array of tracklets (AliTRDseedV1) related to the track candidate
1461 // - the offset for the reference x
1462 // - the slope
1463 // - the reference x position
1464 // Output: - The Chi2 value of the track in z-Direction
1465 //
1466 Float_t chi2Z = 0, nLayers = 0;
053767a4 1467 for (Int_t iLayer = 0; iLayer < AliTRDgeometry::kNlayer; iLayer++) {
41702fec 1468 if(!tracklets[iLayer].IsOK()) continue;
1469 Double_t z = offset + slope * (tracklets[iLayer].GetX0() - xref);
e3cf3d02 1470 chi2Z += TMath::Abs(tracklets[iLayer].GetZfit(0) - z);
41702fec 1471 nLayers++;
1472 }
1473 chi2Z /= TMath::Max((nLayers - 3.0),1.0);
1474 return chi2Z;
eb38ed55 1475}
1476
bccda319 1477//_____________________________________________________________________________
1478Int_t AliTRDtrackerV1::PropagateToX(AliTRDtrackV1 &t, Double_t xToGo, Double_t maxStep)
1479{
41702fec 1480 //
1481 // Starting from current X-position of track <t> this function
1482 // extrapolates the track up to radial position <xToGo>.
1483 // Returns 1 if track reaches the plane, and 0 otherwise
1484 //
bccda319 1485
41702fec 1486 const Double_t kEpsilon = 0.00001;
bccda319 1487
41702fec 1488 // Current track X-position
1489 Double_t xpos = t.GetX();
bccda319 1490
41702fec 1491 // Direction: inward or outward
1492 Double_t dir = (xpos < xToGo) ? 1.0 : -1.0;
bccda319 1493
41702fec 1494 while (((xToGo - xpos) * dir) > kEpsilon) {
bccda319 1495
41702fec 1496 Double_t xyz0[3];
1497 Double_t xyz1[3];
1498 Double_t param[7];
1499 Double_t x;
1500 Double_t y;
1501 Double_t z;
bccda319 1502
41702fec 1503 // The next step size
1504 Double_t step = dir * TMath::Min(TMath::Abs(xToGo-xpos),maxStep);
bccda319 1505
41702fec 1506 // Get the global position of the starting point
1507 t.GetXYZ(xyz0);
bccda319 1508
41702fec 1509 // X-position after next step
1510 x = xpos + step;
bccda319 1511
41702fec 1512 // Get local Y and Z at the X-position of the next step
1513 if (!t.GetProlongation(x,y,z)) {
1514 return 0; // No prolongation possible
1515 }
bccda319 1516
41702fec 1517 // The global position of the end point of this prolongation step
1518 xyz1[0] = x * TMath::Cos(t.GetAlpha()) - y * TMath::Sin(t.GetAlpha());
1519 xyz1[1] = +x * TMath::Sin(t.GetAlpha()) + y * TMath::Cos(t.GetAlpha());
1520 xyz1[2] = z;
bccda319 1521
41702fec 1522 // Calculate the mean material budget between start and
1523 // end point of this prolongation step
83dea92e 1524 if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param)<=0.) return 0;
bccda319 1525
41702fec 1526 // Propagate the track to the X-position after the next step
9c87a076 1527 if (!t.PropagateTo(x, param[1], param[0]*param[4])) return 0;
bccda319 1528
41702fec 1529 // Rotate the track if necessary
1530 AdjustSector(&t);
bccda319 1531
41702fec 1532 // New track X-position
1533 xpos = t.GetX();
bccda319 1534
41702fec 1535 }
bccda319 1536
41702fec 1537 return 1;
bccda319 1538
1539}
1540
eb38ed55 1541
1542//_____________________________________________________________________________
1543Int_t AliTRDtrackerV1::ReadClusters(TClonesArray* &array, TTree *clusterTree) const
1544{
41702fec 1545 //
1546 // Reads AliTRDclusters from the file.
1547 // The names of the cluster tree and branches
1548 // should match the ones used in AliTRDclusterizer::WriteClusters()
1549 //
1550
1551 Int_t nsize = Int_t(clusterTree->GetTotBytes() / (sizeof(AliTRDcluster)));
1552 TObjArray *clusterArray = new TObjArray(nsize+1000);
1553
1554 TBranch *branch = clusterTree->GetBranch("TRDcluster");
1555 if (!branch) {
1556 AliError("Can't get the branch !");
1557 return 1;
1558 }
1559 branch->SetAddress(&clusterArray);
1560
1561 if(!fClusters){
8ae98148 1562 Float_t nclusters = fReconstructor->GetRecoParam()->GetNClusters();
1563 if(fReconstructor->IsHLT()) nclusters /= AliTRDgeometry::kNsector;
1564 array = new TClonesArray("AliTRDcluster", Int_t(nclusters));
41702fec 1565 array->SetOwner(kTRUE);
1566 }
1567
1568 // Loop through all entries in the tree
1569 Int_t nEntries = (Int_t) clusterTree->GetEntries();
1570 Int_t nbytes = 0;
1571 Int_t ncl = 0;
1572 AliTRDcluster *c = 0x0;
1573 for (Int_t iEntry = 0; iEntry < nEntries; iEntry++) {
1574 // Import the tree
1575 nbytes += clusterTree->GetEvent(iEntry);
1576
1577 // Get the number of points in the detector
1578 Int_t nCluster = clusterArray->GetEntriesFast();
1579 for (Int_t iCluster = 0; iCluster < nCluster; iCluster++) {
1580 if(!(c = (AliTRDcluster *) clusterArray->UncheckedAt(iCluster))) continue;
1581 c->SetInChamber();
1582 new((*fClusters)[ncl++]) AliTRDcluster(*c);
1583 delete (clusterArray->RemoveAt(iCluster));
1584 }
1585
1586 }
1587 delete clusterArray;
1588
1589 return 0;
eb38ed55 1590}
1591
1592//_____________________________________________________________________________
1593Int_t AliTRDtrackerV1::LoadClusters(TTree *cTree)
1594{
41702fec 1595 //
66f6bfd9 1596 // Fills clusters into TRD tracking sectors
41702fec 1597 //
41702fec 1598
48f8adf3 1599 if(!fReconstructor->IsWritingClusters()){
1600 fClusters = AliTRDReconstructor::GetClusters();
1601 } else {
66f6bfd9 1602 if (ReadClusters(fClusters, cTree)) {
1603 AliError("Problem with reading the clusters !");
1604 return 1;
1605 }
1606 }
1607 SetClustersOwner();
1608
48f8adf3 1609 if(!fClusters || !fClusters->GetEntriesFast()){
66f6bfd9 1610 AliInfo("No TRD clusters");
41702fec 1611 return 1;
1612 }
66f6bfd9 1613
1614 //Int_t nin =
1615 BuildTrackingContainers();
1616
1617 //Int_t ncl = fClusters->GetEntriesFast();
1618 //AliInfo(Form("Clusters %d [%6.2f %% in the active volume]", ncl, 100.*float(nin)/ncl));
1619
1620 return 0;
1621}
1622
1623//_____________________________________________________________________________
1624Int_t AliTRDtrackerV1::LoadClusters(TClonesArray *clusters)
1625{
1626 //
1627 // Fills clusters into TRD tracking sectors
1628 // Function for use in the HLT
1629
1630 if(!clusters || !clusters->GetEntriesFast()){
1631 AliInfo("No TRD clusters");
41702fec 1632 return 1;
1633 }
1634
66f6bfd9 1635 fClusters = clusters;
1636 SetClustersOwner();
1637
1638 //Int_t nin =
1639 BuildTrackingContainers();
1640
1641 //Int_t ncl = fClusters->GetEntriesFast();
1642 //AliInfo(Form("Clusters %d [%6.2f %% in the active volume]", ncl, 100.*float(nin)/ncl));
1643
1644 return 0;
1645}
1646
1647
1648//____________________________________________________________________
1649Int_t AliTRDtrackerV1::BuildTrackingContainers()
1650{
1651// Building tracking containers for clusters
1652
1653 Int_t nin =0, icl = fClusters->GetEntriesFast();
41702fec 1654 while (icl--) {
1655 AliTRDcluster *c = (AliTRDcluster *) fClusters->UncheckedAt(icl);
1656 if(c->IsInChamber()) nin++;
1657 Int_t detector = c->GetDetector();
1658 Int_t sector = fGeom->GetSector(detector);
053767a4 1659 Int_t stack = fGeom->GetStack(detector);
1660 Int_t layer = fGeom->GetLayer(detector);
41702fec 1661
053767a4 1662 fTrSec[sector].GetChamber(stack, layer, kTRUE)->InsertCluster(c, icl);
41702fec 1663 }
b0a48c4d 1664
1665 const AliTRDCalDet *cal = AliTRDcalibDB::Instance()->GetT0Det();
053767a4 1666 for(int isector =0; isector<AliTRDgeometry::kNsector; isector++){
41702fec 1667 if(!fTrSec[isector].GetNChambers()) continue;
b0a48c4d 1668 fTrSec[isector].Init(fReconstructor, cal);
41702fec 1669 }
66f6bfd9 1670
1671 return nin;
eb38ed55 1672}
1673
1674
66f6bfd9 1675
0906e73e 1676//____________________________________________________________________
1677void AliTRDtrackerV1::UnloadClusters()
1678{
41702fec 1679 //
1680 // Clears the arrays of clusters and tracks. Resets sectors and timebins
1681 //
0906e73e 1682
41702fec 1683 if(fTracks) fTracks->Delete();
1684 if(fTracklets) fTracklets->Delete();
48f8adf3 1685 if(fClusters){
1686 if(IsClustersOwner()) fClusters->Delete();
1687
1688 // save clusters array in the reconstructor for further use.
1689 if(!fReconstructor->IsWritingClusters()){
1690 AliTRDReconstructor::SetClusters(fClusters);
1691 SetClustersOwner(kFALSE);
1692 } else AliTRDReconstructor::SetClusters(0x0);
1693 }
0906e73e 1694
053767a4 1695 for (int i = 0; i < AliTRDgeometry::kNsector; i++) fTrSec[i].Clear();
0906e73e 1696
41702fec 1697 // Increment the Event Number
1698 AliTRDtrackerDebug::SetEventNumber(AliTRDtrackerDebug::GetEventNumber() + 1);
eb38ed55 1699}
0906e73e 1700
fac58f00 1701// //____________________________________________________________________
1702// void AliTRDtrackerV1::UseClusters(const AliKalmanTrack *t, Int_t) const
1703// {
1704// const AliTRDtrackV1 *track = dynamic_cast<const AliTRDtrackV1*>(t);
1705// if(!track) return;
1706//
1707// AliTRDseedV1 *tracklet = 0x0;
1708// for(Int_t ily=AliTRDgeometry::kNlayer; ily--;){
1709// if(!(tracklet = track->GetTracklet(ily))) continue;
1710// AliTRDcluster *c = 0x0;
8d2bec9e 1711// for(Int_t ic=AliTRDseed::kNclusters; ic--;){
fac58f00 1712// if(!(c=tracklet->GetClusters(ic))) continue;
1713// c->Use();
1714// }
1715// }
1716// }
1717//
b1957d3c 1718
eb38ed55 1719//_____________________________________________________________________________
1720Bool_t AliTRDtrackerV1::AdjustSector(AliTRDtrackV1 *track)
1721{
41702fec 1722 //
1723 // Rotates the track when necessary
1724 //
1725
1726 Double_t alpha = AliTRDgeometry::GetAlpha();
1727 Double_t y = track->GetY();
1728 Double_t ymax = track->GetX()*TMath::Tan(0.5*alpha);
3cfaffa4 1729
41702fec 1730 if (y > ymax) {
1731 if (!track->Rotate( alpha)) {
1732 return kFALSE;
1733 }
1734 }
1735 else if (y < -ymax) {
1736 if (!track->Rotate(-alpha)) {
1737 return kFALSE;
1738 }
1739 }
1740
1741 return kTRUE;
0906e73e 1742
1743}
1744
eb38ed55 1745
0906e73e 1746//____________________________________________________________________
1747AliTRDseedV1* AliTRDtrackerV1::GetTracklet(AliTRDtrackV1 *track, Int_t p, Int_t &idx)
1748{
41702fec 1749 // Find tracklet for TRD track <track>
1750 // Parameters
1751 // - track
1752 // - sector
1753 // - plane
1754 // - index
1755 // Output
1756 // tracklet
1757 // index
1758 // Detailed description
1759 //
1760 idx = track->GetTrackletIndex(p);
1761 AliTRDseedV1 *tracklet = (idx==0xffff) ? 0x0 : (AliTRDseedV1*)fTracklets->UncheckedAt(idx);
1762
1763 return tracklet;
0906e73e 1764}
1765
1766//____________________________________________________________________
3b57a3f7 1767AliTRDseedV1* AliTRDtrackerV1::SetTracklet(AliTRDseedV1 *tracklet)
0906e73e 1768{
41702fec 1769 // Add this tracklet to the list of tracklets stored in the tracker
1770 //
1771 // Parameters
1772 // - tracklet : pointer to the tracklet to be added to the list
1773 //
1774 // Output
1775 // - the index of the new tracklet in the tracker tracklets list
1776 //
1777 // Detailed description
1778 // Build the tracklets list if it is not yet created (late initialization)
1779 // and adds the new tracklet to the list.
1780 //
1781 if(!fTracklets){
053767a4 1782 fTracklets = new TClonesArray("AliTRDseedV1", AliTRDgeometry::Nsector()*kMaxTracksStack);
41702fec 1783 fTracklets->SetOwner(kTRUE);
1784 }
1785 Int_t nentries = fTracklets->GetEntriesFast();
1786 return new ((*fTracklets)[nentries]) AliTRDseedV1(*tracklet);
972ef65e 1787}
1788
d20df6fc 1789//____________________________________________________________________
1790AliTRDtrackV1* AliTRDtrackerV1::SetTrack(AliTRDtrackV1 *track)
1791{
1792 // Add this track to the list of tracks stored in the tracker
1793 //
1794 // Parameters
1795 // - track : pointer to the track to be added to the list
1796 //
1797 // Output
1798 // - the pointer added
1799 //
1800 // Detailed description
1801 // Build the tracks list if it is not yet created (late initialization)
1802 // and adds the new track to the list.
1803 //
1804 if(!fTracks){
053767a4 1805 fTracks = new TClonesArray("AliTRDtrackV1", AliTRDgeometry::Nsector()*kMaxTracksStack);
d20df6fc 1806 fTracks->SetOwner(kTRUE);
1807 }
1808 Int_t nentries = fTracks->GetEntriesFast();
1809 return new ((*fTracks)[nentries]) AliTRDtrackV1(*track);
1810}
1811
1812
0906e73e 1813
e4f2f73d 1814//____________________________________________________________________
eb38ed55 1815Int_t AliTRDtrackerV1::Clusters2TracksSM(Int_t sector, AliESDEvent *esd)
e4f2f73d 1816{
41702fec 1817 //
1818 // Steer tracking for one SM.
1819 //
1820 // Parameters :
1821 // sector : Array of (SM) propagation layers containing clusters
1822 // esd : The current ESD event. On output it contains the also
1823 // the ESD (TRD) tracks found in this SM.
1824 //
1825 // Output :
1826 // Number of tracks found in this TRD supermodule.
1827 //
1828 // Detailed description
1829 //
1830 // 1. Unpack AliTRDpropagationLayers objects for each stack.
1831 // 2. Launch stack tracking.
1832 // See AliTRDtrackerV1::Clusters2TracksStack() for details.
1833 // 3. Pack results in the ESD event.
1834 //
1835
1836 // allocate space for esd tracks in this SM
1837 TClonesArray esdTrackList("AliESDtrack", 2*kMaxTracksStack);
1838 esdTrackList.SetOwner();
1839
1840 Int_t nTracks = 0;
1841 Int_t nChambers = 0;
1842 AliTRDtrackingChamber **stack = 0x0, *chamber = 0x0;
053767a4 1843 for(int istack = 0; istack<AliTRDgeometry::kNstack; istack++){
41702fec 1844 if(!(stack = fTrSec[sector].GetStack(istack))) continue;
1845 nChambers = 0;
053767a4 1846 for(int ilayer=0; ilayer<AliTRDgeometry::kNlayer; ilayer++){
1847 if(!(chamber = stack[ilayer])) continue;
3a039a31 1848 if(chamber->GetNClusters() < fgNTimeBins * fReconstructor->GetRecoParam() ->GetFindableClusters()) continue;
41702fec 1849 nChambers++;
053767a4 1850 //AliInfo(Form("sector %d stack %d layer %d clusters %d", sector, istack, ilayer, chamber->GetNClusters()));
41702fec 1851 }
1852 if(nChambers < 4) continue;
1853 //AliInfo(Form("Doing stack %d", istack));
1854 nTracks += Clusters2TracksStack(stack, &esdTrackList);
1855 }
1856 //AliInfo(Form("Found %d tracks in SM %d [%d]\n", nTracks, sector, esd->GetNumberOfTracks()));
1857
1858 for(int itrack=0; itrack<nTracks; itrack++)
1859 esd->AddTrack((AliESDtrack*)esdTrackList[itrack]);
1860
1861 // Reset Track and Candidate Number
1862 AliTRDtrackerDebug::SetCandidateNumber(0);
1863 AliTRDtrackerDebug::SetTrackNumber(0);
1864 return nTracks;
e4f2f73d 1865}
1866
1867//____________________________________________________________________
eb38ed55 1868Int_t AliTRDtrackerV1::Clusters2TracksStack(AliTRDtrackingChamber **stack, TClonesArray *esdTrackList)
e4f2f73d 1869{
41702fec 1870 //
1871 // Make tracks in one TRD stack.
1872 //
1873 // Parameters :
1874 // layer : Array of stack propagation layers containing clusters
1875 // esdTrackList : Array of ESD tracks found by the stand alone tracker.
1876 // On exit the tracks found in this stack are appended.
1877 //
1878 // Output :
1879 // Number of tracks found in this stack.
1880 //
1881 // Detailed description
1882 //
1883 // 1. Find the 3 most useful seeding chambers. See BuildSeedingConfigs() for details.
1884 // 2. Steer AliTRDtrackerV1::MakeSeeds() for 3 seeding layer configurations.
1885 // See AliTRDtrackerV1::MakeSeeds() for more details.
1886 // 3. Arrange track candidates in decreasing order of their quality
1887 // 4. Classify tracks in 5 categories according to:
1888 // a) number of layers crossed
1889 // b) track quality
1890 // 5. Sign clusters by tracks in decreasing order of track quality
1891 // 6. Build AliTRDtrack out of seeding tracklets
1892 // 7. Cook MC label
1893 // 8. Build ESD track and register it to the output list
1894 //
1895
b0a48c4d 1896 const AliTRDCalDet *cal = AliTRDcalibDB::Instance()->GetT0Det();
41702fec 1897 AliTRDtrackingChamber *chamber = 0x0;
fac58f00 1898 AliTRDtrackingChamber **ci = 0x0;
41702fec 1899 AliTRDseedV1 sseed[kMaxTracksStack*6]; // to be initialized
1900 Int_t pars[4]; // MakeSeeds parameters
1901
1902 //Double_t alpha = AliTRDgeometry::GetAlpha();
1903 //Double_t shift = .5 * alpha;
1904 Int_t configs[kNConfigs];
1905
fac58f00 1906 // Purge used clusters from the containers
1907 ci = &stack[0];
1908 for(Int_t ic = kNPlanes; ic--; ci++){
1909 if(!(*ci)) continue;
1910 (*ci)->Update();
1911 }
1912
41702fec 1913 // Build initial seeding configurations
1914 Double_t quality = BuildSeedingConfigs(stack, configs);
3a039a31 1915 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){
41702fec 1916 AliInfo(Form("Plane config %d %d %d Quality %f"
1917 , configs[0], configs[1], configs[2], quality));
1918 }
d931f2aa 1919
41702fec 1920
1921 // Initialize contors
1922 Int_t ntracks, // number of TRD track candidates
1923 ntracks1, // number of registered TRD tracks/iter
1924 ntracks2 = 0; // number of all registered TRD tracks in stack
1925 fSieveSeeding = 0;
d931f2aa 1926
1927 // Get stack index
fac58f00 1928 Int_t ic = 0; ci = &stack[0];
1929 while(ic<kNPlanes && !(*ci)){ic++; ci++;}
1930 if(!(*ci)) return ntracks2;
1931 Int_t istack = fGeom->GetStack((*ci)->GetDetector());
d931f2aa 1932
41702fec 1933 do{
1934 // Loop over seeding configurations
1935 ntracks = 0; ntracks1 = 0;
1936 for (Int_t iconf = 0; iconf<3; iconf++) {
1937 pars[0] = configs[iconf];
1938 pars[1] = ntracks;
d931f2aa 1939 pars[2] = istack;
41702fec 1940 ntracks = MakeSeeds(stack, &sseed[6*ntracks], pars);
1941 if(ntracks == kMaxTracksStack) break;
1942 }
3a039a31 1943 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1) AliInfo(Form("Candidate TRD tracks %d in iteration %d.", ntracks, fSieveSeeding));
41702fec 1944
1945 if(!ntracks) break;
1946
1947 // Sort the seeds according to their quality
1948 Int_t sort[kMaxTracksStack];
1949 TMath::Sort(ntracks, fTrackQuality, sort, kTRUE);
1950
1951 // Initialize number of tracks so far and logic switches
1952 Int_t ntracks0 = esdTrackList->GetEntriesFast();
1953 Bool_t signedTrack[kMaxTracksStack];
1954 Bool_t fakeTrack[kMaxTracksStack];
1955 for (Int_t i=0; i<ntracks; i++){
1956 signedTrack[i] = kFALSE;
1957 fakeTrack[i] = kFALSE;
1958 }
1959 //AliInfo("Selecting track candidates ...");
1960
1961 // Sieve clusters in decreasing order of track quality
1962 Double_t trackParams[7];
1963 // AliTRDseedV1 *lseed = 0x0;
1964 Int_t jSieve = 0, candidates;
1965 do{
1966 //AliInfo(Form("\t\tITER = %i ", jSieve));
1967
1968 // Check track candidates
1969 candidates = 0;
1970 for (Int_t itrack = 0; itrack < ntracks; itrack++) {
804bb02e 1971 Int_t trackIndex = sort[itrack];
1972 if (signedTrack[trackIndex] || fakeTrack[trackIndex]) continue;
41702fec 1973
1974
804bb02e 1975 // Calculate track parameters from tracklets seeds
804bb02e 1976 Int_t ncl = 0;
1977 Int_t nused = 0;
1978 Int_t nlayers = 0;
1979 Int_t findable = 0;
1980 for (Int_t jLayer = 0; jLayer < kNPlanes; jLayer++) {
1981 Int_t jseed = kNPlanes*trackIndex+jLayer;
1982 if(!sseed[jseed].IsOK()) continue;
f29f13a6 1983 if (TMath::Abs(sseed[jseed].GetYref(0) / sseed[jseed].GetX0()) < 0.158) findable++;
804bb02e 1984
1985 sseed[jseed].UpdateUsed();
1986 ncl += sseed[jseed].GetN2();
1987 nused += sseed[jseed].GetNUsed();
1988 nlayers++;
804bb02e 1989 }
1990
f29f13a6 1991 // Filter duplicated tracks
1992 if (nused > 30){
1993 //printf("Skip %d nused %d\n", trackIndex, nused);
1994 fakeTrack[trackIndex] = kTRUE;
1995 continue;
1996 }
1997 if (Float_t(nused)/ncl >= .25){
1998 //printf("Skip %d nused/ncl >= .25\n", trackIndex);
1999 fakeTrack[trackIndex] = kTRUE;
2000 continue;
2001 }
41702fec 2002
f29f13a6 2003 // Classify tracks
2004 Bool_t skip = kFALSE;
2005 switch(jSieve){
2006 case 0:
2007 if(nlayers < 6) {skip = kTRUE; break;}
2008 if(TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -5.){skip = kTRUE; break;}
2009 break;
2010
2011 case 1:
2012 if(nlayers < findable){skip = kTRUE; break;}
2013 if(TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -4.){skip = kTRUE; break;}
2014 break;
2015
2016 case 2:
2017 if ((nlayers == findable) || (nlayers == 6)) { skip = kTRUE; break;}
2018 if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -6.0){skip = kTRUE; break;}
2019 break;
2020
2021 case 3:
2022 if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -5.){skip = kTRUE; break;}
2023 break;
2024
2025 case 4:
2026 if (nlayers == 3){skip = kTRUE; break;}
2027 //if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) - nused/(nlayers-3.0) < -15.0){skip = kTRUE; break;}
2028 break;
2029 }
2030 if(skip){
2031 candidates++;
2032 //printf("REJECTED : %d [%d] nlayers %d trackQuality = %e nused %d\n", itrack, trackIndex, nlayers, fTrackQuality[trackIndex], nused);
2033 continue;
2034 }
2035 signedTrack[trackIndex] = kTRUE;
2036
2037 // Build track parameters
2038 AliTRDseedV1 *lseed =&sseed[trackIndex*6];
2039 /* Int_t idx = 0;
2040 while(idx<3 && !lseed->IsOK()) {
2041 idx++;
2042 lseed++;
2043 }*/
2044 Double_t x = lseed->GetX0();// - 3.5;
2045 trackParams[0] = x; //NEW AB
2046 trackParams[1] = lseed->GetYref(0); // lseed->GetYat(x);
2047 trackParams[2] = lseed->GetZref(0); // lseed->GetZat(x);
2048 trackParams[3] = TMath::Sin(TMath::ATan(lseed->GetYref(1)));
2049 trackParams[4] = lseed->GetZref(1) / TMath::Sqrt(1. + lseed->GetYref(1) * lseed->GetYref(1));
2050 trackParams[5] = lseed->GetC();
2051 Int_t ich = 0; while(!(chamber = stack[ich])) ich++;
2052 trackParams[6] = fGeom->GetSector(chamber->GetDetector());/* *alpha+shift; // Supermodule*/
2053
2054 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){
2055 AliInfo(Form("Track %d [%d] nlayers %d trackQuality = %e nused %d, yref = %3.3f", itrack, trackIndex, nlayers, fTrackQuality[trackIndex], nused, trackParams[1]));
2056
f29f13a6 2057 AliTRDseedV1 *dseed[6];
fac58f00 2058 memcpy(dseed, lseed, 6*sizeof(AliTRDseedV1*));
f29f13a6 2059
2060 //Int_t eventNrInFile = esd->GetEventNumberInFile();
2061 //AliInfo(Form("Number of clusters %d.", nclusters));
2062 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2063 Int_t trackNumber = AliTRDtrackerDebug::GetTrackNumber();
2064 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2065 TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
2066 cstreamer << "Clusters2TracksStack"
2067 << "EventNumber=" << eventNumber
2068 << "TrackNumber=" << trackNumber
2069 << "CandidateNumber=" << candidateNumber
2070 << "Iter=" << fSieveSeeding
2071 << "Like=" << fTrackQuality[trackIndex]
2072 << "S0.=" << dseed[0]
2073 << "S1.=" << dseed[1]
2074 << "S2.=" << dseed[2]
2075 << "S3.=" << dseed[3]
2076 << "S4.=" << dseed[4]
2077 << "S5.=" << dseed[5]
2078 << "p0=" << trackParams[0]
2079 << "p1=" << trackParams[1]
2080 << "p2=" << trackParams[2]
2081 << "p3=" << trackParams[3]
2082 << "p4=" << trackParams[4]
2083 << "p5=" << trackParams[5]
2084 << "p6=" << trackParams[6]
f29f13a6 2085 << "Ncl=" << ncl
2086 << "NLayers=" << nlayers
2087 << "Findable=" << findable
2088 << "NUsed=" << nused
2089 << "\n";
2090 }
d877f55f 2091
f29f13a6 2092 AliTRDtrackV1 *track = MakeTrack(&sseed[trackIndex*kNPlanes], trackParams);
2093 if(!track){
2094 AliWarning("Fail to build a TRD Track.");
2095 continue;
d877f55f 2096 }
41702fec 2097
f29f13a6 2098 //AliInfo("End of MakeTrack()");
2099 AliESDtrack *esdTrack = new ((*esdTrackList)[ntracks0++]) AliESDtrack();
2100 esdTrack->UpdateTrackParams(track, AliESDtrack::kTRDout);
2101 esdTrack->SetLabel(track->GetLabel());
2102 track->UpdateESDtrack(esdTrack);
2103 // write ESD-friends if neccessary
2104 if (fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 0){
2105 AliTRDtrackV1 *calibTrack = new AliTRDtrackV1(*track);
2106 calibTrack->SetOwner();
2107 esdTrack->AddCalibObject(calibTrack);
2108 }
2109 ntracks1++;
2110 AliTRDtrackerDebug::SetTrackNumber(AliTRDtrackerDebug::GetTrackNumber() + 1);
41702fec 2111 }
2112
2113 jSieve++;
2114 } while(jSieve<5 && candidates); // end track candidates sieve
2115 if(!ntracks1) break;
2116
2117 // increment counters
2118 ntracks2 += ntracks1;
4302c900 2119
2120 if(fReconstructor->IsHLT()) break;
41702fec 2121 fSieveSeeding++;
2122
2123 // Rebuild plane configurations and indices taking only unused clusters into account
2124 quality = BuildSeedingConfigs(stack, configs);
3a039a31 2125 if(quality < 1.E-7) break; //fReconstructor->GetRecoParam() ->GetPlaneQualityThreshold()) break;
41702fec 2126
2127 for(Int_t ip = 0; ip < kNPlanes; ip++){
2128 if(!(chamber = stack[ip])) continue;
b0a48c4d 2129 chamber->Build(fGeom, cal);//Indices(fSieveSeeding);
41702fec 2130 }
2131
3a039a31 2132 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){
41702fec 2133 AliInfo(Form("Sieve level %d Plane config %d %d %d Quality %f", fSieveSeeding, configs[0], configs[1], configs[2], quality));
2134 }
2135 } while(fSieveSeeding<10); // end stack clusters sieve
2136
2137
2138
2139 //AliInfo(Form("Registered TRD tracks %d in stack %d.", ntracks2, pars[1]));
2140
2141 return ntracks2;
e4f2f73d 2142}
2143
2144//___________________________________________________________________
eb38ed55 2145Double_t AliTRDtrackerV1::BuildSeedingConfigs(AliTRDtrackingChamber **stack, Int_t *configs)
e4f2f73d 2146{
41702fec 2147 //
2148 // Assign probabilities to chambers according to their
2149 // capability of producing seeds.
2150 //
2151 // Parameters :
2152 //
2153 // layers : Array of stack propagation layers for all 6 chambers in one stack
2154 // configs : On exit array of configuration indexes (see GetSeedingConfig()
2155 // for details) in the decreasing order of their seeding probabilities.
2156 //
2157 // Output :
2158 //
2159 // Return top configuration quality
2160 //
2161 // Detailed description:
2162 //
2163 // To each chamber seeding configuration (see GetSeedingConfig() for
2164 // the list of all configurations) one defines 2 quality factors:
2165 // - an apriori topological quality (see GetSeedingConfig() for details) and
2166 // - a data quality based on the uniformity of the distribution of
2167 // clusters over the x range (time bins population). See CookChamberQA() for details.
2168 // The overall chamber quality is given by the product of this 2 contributions.
2169 //
2170
2171 Double_t chamberQ[kNPlanes];
2172 AliTRDtrackingChamber *chamber = 0x0;
2173 for(int iplane=0; iplane<kNPlanes; iplane++){
2174 if(!(chamber = stack[iplane])) continue;
2175 chamberQ[iplane] = (chamber = stack[iplane]) ? chamber->GetQuality() : 0.;
2176 }
2177
2178 Double_t tconfig[kNConfigs];
2179 Int_t planes[4];
2180 for(int iconf=0; iconf<kNConfigs; iconf++){
2181 GetSeedingConfig(iconf, planes);
2182 tconfig[iconf] = fgTopologicQA[iconf];
2183 for(int iplane=0; iplane<4; iplane++) tconfig[iconf] *= chamberQ[planes[iplane]];
2184 }
2185
2186 TMath::Sort((Int_t)kNConfigs, tconfig, configs, kTRUE);
2187 // AliInfo(Form("q[%d] = %f", configs[0], tconfig[configs[0]]));
2188 // AliInfo(Form("q[%d] = %f", configs[1], tconfig[configs[1]]));
2189 // AliInfo(Form("q[%d] = %f", configs[2], tconfig[configs[2]]));
2190
2191 return tconfig[configs[0]];
e4f2f73d 2192}
2193
2194//____________________________________________________________________
eb38ed55 2195Int_t AliTRDtrackerV1::MakeSeeds(AliTRDtrackingChamber **stack, AliTRDseedV1 *sseed, Int_t *ipar)
e4f2f73d 2196{
41702fec 2197 //
2198 // Make tracklet seeds in the TRD stack.
2199 //
2200 // Parameters :
2201 // layers : Array of stack propagation layers containing clusters
2202 // sseed : Array of empty tracklet seeds. On exit they are filled.
2203 // ipar : Control parameters:
2204 // ipar[0] -> seeding chambers configuration
2205 // ipar[1] -> stack index
2206 // ipar[2] -> number of track candidates found so far
2207 //
2208 // Output :
2209 // Number of tracks candidates found.
2210 //
2211 // Detailed description
2212 //
2213 // The following steps are performed:
2214 // 1. Select seeding layers from seeding chambers
2215 // 2. Select seeding clusters from the seeding AliTRDpropagationLayerStack.
2216 // The clusters are taken from layer 3, layer 0, layer 1 and layer 2, in
2217 // this order. The parameters controling the range of accepted clusters in
2218 // layer 0, 1, and 2 are defined in AliTRDchamberTimeBin::BuildCond().
2219 // 3. Helix fit of the cluster set. (see AliTRDtrackerFitter::FitRieman(AliTRDcluster**))
2220 // 4. Initialize seeding tracklets in the seeding chambers.
2221 // 5. Filter 0.
2222 // Chi2 in the Y direction less than threshold ... (1./(3. - sLayer))
2223 // Chi2 in the Z direction less than threshold ... (1./(3. - sLayer))
2224 // 6. Attach clusters to seeding tracklets and find linear approximation of
2225 // the tracklet (see AliTRDseedV1::AttachClustersIter()). The number of used
2226 // clusters used by current seeds should not exceed ... (25).
2227 // 7. Filter 1.
2228 // All 4 seeding tracklets should be correctly constructed (see
2229 // AliTRDseedV1::AttachClustersIter())
2230 // 8. Helix fit of the seeding tracklets
2231 // 9. Filter 2.
2232 // Likelihood calculation of the fit. (See AliTRDtrackerV1::CookLikelihood() for details)
2233 // 10. Extrapolation of the helix fit to the other 2 chambers:
2234 // a) Initialization of extrapolation tracklet with fit parameters
2235 // b) Helix fit of tracklets
2236 // c) Attach clusters and linear interpolation to extrapolated tracklets
2237 // d) Helix fit of tracklets
2238 // 11. Improve seeding tracklets quality by reassigning clusters.
2239 // See AliTRDtrackerV1::ImproveSeedQuality() for details.
2240 // 12. Helix fit of all 6 seeding tracklets and chi2 calculation
2241 // 13. Hyperplane fit and track quality calculation. See AliTRDtrackerFitter::FitHyperplane() for details.
2242 // 14. Cooking labels for tracklets. Should be done only for MC
2243 // 15. Register seeds.
2244 //
2245
2246 AliTRDtrackingChamber *chamber = 0x0;
be24510a 2247 AliTRDcluster *c[kNSeedPlanes] = {0x0, 0x0, 0x0, 0x0}; // initilize seeding clusters
41702fec 2248 AliTRDseedV1 *cseed = &sseed[0]; // initialize tracklets for first track
2249 Int_t ncl, mcl; // working variable for looping over clusters
2250 Int_t index[AliTRDchamberTimeBin::kMaxClustersLayer], jndex[AliTRDchamberTimeBin::kMaxClustersLayer];
2251 // chi2 storage
2252 // chi2[0] = tracklet chi2 on the Z direction
2253 // chi2[1] = tracklet chi2 on the R direction
2254 Double_t chi2[4];
2255
e79f8eb0 2256 // Default positions for the anode wire in all 6 Layers in case of a stack with missing clusters
2257 // Positions taken using cosmic data taken with SM3 after rebuild
d931f2aa 2258 Double_t x_def[kNPlanes] = {300.2, 312.8, 325.4, 338.0, 350.6, 363.2};
41702fec 2259
2260 // this should be data member of AliTRDtrack
2261 Double_t seedQuality[kMaxTracksStack];
2262
2263 // unpack control parameters
2264 Int_t config = ipar[0];
2265 Int_t ntracks = ipar[1];
d931f2aa 2266 Int_t istack = ipar[2];
41702fec 2267 Int_t planes[kNSeedPlanes]; GetSeedingConfig(config, planes);
be24510a 2268 Int_t planesExt[kNPlanes-kNSeedPlanes]; GetExtrapolationConfig(config, planesExt);
2269
2270
41702fec 2271 // Init chambers geometry
41702fec 2272 Double_t hL[kNPlanes]; // Tilting angle
2273 Float_t padlength[kNPlanes]; // pad lenghts
2274 AliTRDpadPlane *pp = 0x0;
2275 for(int iplane=0; iplane<kNPlanes; iplane++){
2276 pp = fGeom->GetPadPlane(iplane, istack);
bb79ccd5 2277 hL[iplane] = TMath::Tan(TMath::DegToRad()*pp->GetTiltingAngle());
41702fec 2278 padlength[iplane] = pp->GetLengthIPad();
2279 }
2280
3a039a31 2281 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){
41702fec 2282 AliInfo(Form("Making seeds Stack[%d] Config[%d] Tracks[%d]...", istack, config, ntracks));
2283 }
2284
d931f2aa 2285 // Build seeding layers
d611c74f 2286 ResetSeedTB();
41702fec 2287 Int_t nlayers = 0;
41702fec 2288 for(int isl=0; isl<kNSeedPlanes; isl++){
2289 if(!(chamber = stack[planes[isl]])) continue;
3a039a31 2290 if(!chamber->GetSeedingLayer(fSeedTB[isl], fGeom, fReconstructor)) continue;
41702fec 2291 nlayers++;
41702fec 2292 }
1ba638fc 2293 if(nlayers < 4) return ntracks;
41702fec 2294
2295
2296 // Start finding seeds
2297 Double_t cond0[4], cond1[4], cond2[4];
2298 Int_t icl = 0;
d611c74f 2299 while((c[3] = (*fSeedTB[3])[icl++])){
41702fec 2300 if(!c[3]) continue;
d611c74f 2301 fSeedTB[0]->BuildCond(c[3], cond0, 0);
2302 fSeedTB[0]->GetClusters(cond0, index, ncl);
41702fec 2303 //printf("Found c[3] candidates 0 %d\n", ncl);
2304 Int_t jcl = 0;
2305 while(jcl<ncl) {
d611c74f 2306 c[0] = (*fSeedTB[0])[index[jcl++]];
41702fec 2307 if(!c[0]) continue;
2308 Double_t dx = c[3]->GetX() - c[0]->GetX();
2309 Double_t theta = (c[3]->GetZ() - c[0]->GetZ())/dx;
2310 Double_t phi = (c[3]->GetY() - c[0]->GetY())/dx;
d611c74f 2311 fSeedTB[1]->BuildCond(c[0], cond1, 1, theta, phi);
2312 fSeedTB[1]->GetClusters(cond1, jndex, mcl);
41702fec 2313 //printf("Found c[0] candidates 1 %d\n", mcl);
2314
2315 Int_t kcl = 0;
2316 while(kcl<mcl) {
d611c74f 2317 c[1] = (*fSeedTB[1])[jndex[kcl++]];
2318 if(!c[1]) continue;
2319 fSeedTB[2]->BuildCond(c[1], cond2, 2, theta, phi);
2320 c[2] = fSeedTB[2]->GetNearestCluster(cond2);
2321 //printf("Found c[1] candidate 2 %p\n", c[2]);
2322 if(!c[2]) continue;
2323
2324 // AliInfo("Seeding clusters found. Building seeds ...");
2325 // 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());
2326
804bb02e 2327 for (Int_t il = 0; il < kNPlanes; il++) cseed[il].Reset();
41702fec 2328
d611c74f 2329 FitRieman(c, chi2);
2330
d931f2aa 2331 AliTRDseedV1 *tseed = &cseed[0];
2332 AliTRDtrackingChamber **cIter = &stack[0];
2333 for(int iLayer=0; iLayer<kNPlanes; iLayer++, tseed++, cIter++){
2334 tseed->SetDetector((*cIter) ? (*cIter)->GetDetector() : -1);
43d6ad34 2335 tseed->SetTilt(hL[iLayer]);
2336 tseed->SetPadLength(padlength[iLayer]);
3a039a31 2337 tseed->SetReconstructor(fReconstructor);
d931f2aa 2338 tseed->SetX0((*cIter) ? (*cIter)->GetX() : x_def[iLayer]);
d611c74f 2339 tseed->Init(GetRiemanFitter());
f29f13a6 2340 tseed->SetStandAlone(kTRUE);
d611c74f 2341 }
2342
2343 Bool_t isFake = kFALSE;
3a039a31 2344 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){
d611c74f 2345 if (c[0]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
2346 if (c[1]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
2347 if (c[2]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
2348
2349 Double_t xpos[4];
2350 for(Int_t l = 0; l < kNSeedPlanes; l++) xpos[l] = fSeedTB[l]->GetX();
2351 Float_t yref[4];
2352 for(int il=0; il<4; il++) yref[il] = cseed[planes[il]].GetYref(0);
2353 Int_t ll = c[3]->GetLabel(0);
2354 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2355 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2356 AliRieman *rim = GetRiemanFitter();
29f95561 2357 TTreeSRedirector &cs0 = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
d611c74f 2358 cs0 << "MakeSeeds0"
2359 <<"EventNumber=" << eventNumber
2360 <<"CandidateNumber=" << candidateNumber
2361 <<"isFake=" << isFake
2362 <<"config=" << config
2363 <<"label=" << ll
2364 <<"chi2z=" << chi2[0]
2365 <<"chi2y=" << chi2[1]
2366 <<"Y2exp=" << cond2[0]
2367 <<"Z2exp=" << cond2[1]
2368 <<"X0=" << xpos[0] //layer[sLayer]->GetX()
2369 <<"X1=" << xpos[1] //layer[sLayer + 1]->GetX()
2370 <<"X2=" << xpos[2] //layer[sLayer + 2]->GetX()
2371 <<"X3=" << xpos[3] //layer[sLayer + 3]->GetX()
2372 <<"yref0=" << yref[0]
2373 <<"yref1=" << yref[1]
2374 <<"yref2=" << yref[2]
2375 <<"yref3=" << yref[3]
2376 <<"c0.=" << c[0]
2377 <<"c1.=" << c[1]
2378 <<"c2.=" << c[2]
2379 <<"c3.=" << c[3]
2380 <<"Seed0.=" << &cseed[planes[0]]
2381 <<"Seed1.=" << &cseed[planes[1]]
2382 <<"Seed2.=" << &cseed[planes[2]]
2383 <<"Seed3.=" << &cseed[planes[3]]
2384 <<"RiemanFitter.=" << rim
2385 <<"\n";
2386 }
3a039a31 2387 if(chi2[0] > fReconstructor->GetRecoParam() ->GetChi2Z()/*7./(3. - sLayer)*//*iter*/){
91834b8d 2388// //AliInfo(Form("Failed chi2 filter on chi2Z [%f].", chi2[0]));
d611c74f 2389 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2390 continue;
2391 }
3a039a31 2392 if(chi2[1] > fReconstructor->GetRecoParam() ->GetChi2Y()/*1./(3. - sLayer)*//*iter*/){
91834b8d 2393// //AliInfo(Form("Failed chi2 filter on chi2Y [%f].", chi2[1]));
d611c74f 2394 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2395 continue;
2396 }
2397 //AliInfo("Passed chi2 filter.");
2398
2399 // try attaching clusters to tracklets
d611c74f 2400 Int_t mlayers = 0;
be24510a 2401 for(int iLayer=0; iLayer<kNSeedPlanes; iLayer++){
d611c74f 2402 Int_t jLayer = planes[iLayer];
f29f13a6 2403 if(!cseed[jLayer].AttachClusters(stack[jLayer], kTRUE)) continue;
2404 cseed[jLayer].UpdateUsed();
2405 if(!cseed[jLayer].IsOK()) continue;
d611c74f 2406 mlayers++;
2407 }
be24510a 2408
2409 if(mlayers < kNSeedPlanes){
2410 //AliInfo(Form("Failed updating all seeds %d [%d].", mlayers, kNSeedPlanes));
2411 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2412 continue;
2413 }
2414
2415 // temporary exit door for the HLT
4302c900 2416 if(fReconstructor->IsHLT()){
be24510a 2417 // attach clusters to extrapolation chambers
2418 for(int iLayer=0; iLayer<kNPlanes-kNSeedPlanes; iLayer++){
2419 Int_t jLayer = planesExt[iLayer];
2420 if(!(chamber = stack[jLayer])) continue;
f29f13a6 2421 cseed[jLayer].AttachClusters(chamber, kTRUE);
be24510a 2422 }
4302c900 2423 fTrackQuality[ntracks] = 1.; // dummy value
2424 ntracks++;
218ba867 2425 if(ntracks == kMaxTracksStack) return ntracks;
4302c900 2426 cseed += 6;
2427 continue;
2428 }
2429
be24510a 2430
f29f13a6 2431 // Update Seeds and calculate Likelihood
d611c74f 2432 // fit tracklets and cook likelihood
f29f13a6 2433 FitTiltedRieman(&cseed[0], kTRUE);
2434 for(int iLayer=0; iLayer<kNSeedPlanes; iLayer++){
2435 Int_t jLayer = planes[iLayer];
2436 cseed[jLayer].Fit(kTRUE);
2437 }
91834b8d 2438 Double_t like = CookLikelihood(&cseed[0], planes); // to be checked
d611c74f 2439
3a039a31 2440 if (TMath::Log(1.E-9 + like) < fReconstructor->GetRecoParam() ->GetTrackLikelihood()){
d611c74f 2441 //AliInfo(Form("Failed likelihood %f[%e].", TMath::Log(1.E-9 + like), like));
2442 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2443 continue;
2444 }
2445 //AliInfo(Form("Passed likelihood %f[%e].", TMath::Log(1.E-9 + like), like));
2446
2447 // book preliminary results
2448 seedQuality[ntracks] = like;
2449 fSeedLayer[ntracks] = config;/*sLayer;*/
2450
2451 // attach clusters to the extrapolation seeds
be24510a 2452 for(int iLayer=0; iLayer<kNPlanes-kNSeedPlanes; iLayer++){
2453 Int_t jLayer = planesExt[iLayer];
d611c74f 2454 if(!(chamber = stack[jLayer])) continue;
d611c74f 2455
2456 // fit extrapolated seed
2457 if ((jLayer == 0) && !(cseed[1].IsOK())) continue;
2458 if ((jLayer == 5) && !(cseed[4].IsOK())) continue;
2459 AliTRDseedV1 pseed = cseed[jLayer];
f29f13a6 2460 if(!pseed.AttachClusters(chamber, kTRUE)) continue;
2461 pseed.Fit(kTRUE);
d611c74f 2462 cseed[jLayer] = pseed;
d611c74f 2463 FitTiltedRieman(cseed, kTRUE);
f29f13a6 2464 cseed[jLayer].Fit(kTRUE);
d611c74f 2465 }
2466
2467 // AliInfo("Extrapolation done.");
2468 // Debug Stream containing all the 6 tracklets
3a039a31 2469 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){
29f95561 2470 TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
d611c74f 2471 TLinearFitter *tiltedRieman = GetTiltedRiemanFitter();
2472 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2473 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2474 cstreamer << "MakeSeeds1"
2475 << "EventNumber=" << eventNumber
2476 << "CandidateNumber=" << candidateNumber
2477 << "S0.=" << &cseed[0]
2478 << "S1.=" << &cseed[1]
2479 << "S2.=" << &cseed[2]
2480 << "S3.=" << &cseed[3]
2481 << "S4.=" << &cseed[4]
2482 << "S5.=" << &cseed[5]
2483 << "FitterT.=" << tiltedRieman
2484 << "\n";
2485 }
2486
fb872574 2487 if(fReconstructor->GetRecoParam()->HasImproveTracklets() && ImproveSeedQuality(stack, cseed) < 4){
d611c74f 2488 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2489 continue;
2490 }
2491 //AliInfo("Improve seed quality done.");
2492
2493 // fit full track and cook likelihoods
2494 // Double_t curv = FitRieman(&cseed[0], chi2);
2495 // Double_t chi2ZF = chi2[0] / TMath::Max((mlayers - 3.), 1.);
2496 // Double_t chi2RF = chi2[1] / TMath::Max((mlayers - 3.), 1.);
2497
2498 // do the final track fitting (Once with vertex constraint and once without vertex constraint)
2499 Double_t chi2Vals[3];
2500 chi2Vals[0] = FitTiltedRieman(&cseed[0], kFALSE);
91834b8d 2501 if(fReconstructor->GetRecoParam()->IsVertexConstrained())
d611c74f 2502 chi2Vals[1] = FitTiltedRiemanConstraint(&cseed[0], GetZ()); // Do Vertex Constrained fit if desired
2503 else
2504 chi2Vals[1] = 1.;
2505 chi2Vals[2] = GetChi2Z(&cseed[0]) / TMath::Max((mlayers - 3.), 1.);
2506 // Chi2 definitions in testing stage
2507 //chi2Vals[2] = GetChi2ZTest(&cseed[0]);
2508 fTrackQuality[ntracks] = CalculateTrackLikelihood(&cseed[0], &chi2Vals[0]);
2509 //AliInfo("Hyperplane fit done\n");
fac58f00 2510
3a039a31 2511 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){
29f95561 2512 TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
d611c74f 2513 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2514 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2515 TLinearFitter *fitterTC = GetTiltedRiemanFitterConstraint();
2516 TLinearFitter *fitterT = GetTiltedRiemanFitter();
91834b8d 2517 Int_t ncls = 0;
2518 for(Int_t iseed = 0; iseed < kNPlanes; iseed++){
2519 ncls += cseed[iseed].IsOK() ? cseed[iseed].GetN2() : 0;
2520 }
d611c74f 2521 cstreamer << "MakeSeeds2"
2522 << "EventNumber=" << eventNumber
2523 << "CandidateNumber=" << candidateNumber
2524 << "Chi2TR=" << chi2Vals[0]
2525 << "Chi2TC=" << chi2Vals[1]
2526 << "Nlayers=" << mlayers
91834b8d 2527 << "NClusters=" << ncls
d611c74f 2528 << "Like=" << like
2529 << "S0.=" << &cseed[0]
2530 << "S1.=" << &cseed[1]
2531 << "S2.=" << &cseed[2]
2532 << "S3.=" << &cseed[3]
2533 << "S4.=" << &cseed[4]
2534 << "S5.=" << &cseed[5]
d611c74f 2535 << "FitterT.=" << fitterT
2536 << "FitterTC.=" << fitterTC
2537 << "\n";
2538 }
2539
2540 ntracks++;
2541 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2542 if(ntracks == kMaxTracksStack){
2543 AliWarning(Form("Number of seeds reached maximum allowed (%d) in stack.", kMaxTracksStack));
2544 return ntracks;
2545 }
2546 cseed += 6;
41702fec 2547 }
2548 }
2549 }
41702fec 2550
2551 return ntracks;
e4f2f73d 2552}
2553
2554//_____________________________________________________________________________
0906e73e 2555AliTRDtrackV1* AliTRDtrackerV1::MakeTrack(AliTRDseedV1 *seeds, Double_t *params)
e4f2f73d 2556{
41702fec 2557 //
2558 // Build a TRD track out of tracklet candidates
2559 //
2560 // Parameters :
2561 // seeds : array of tracklets
2562 // params : track parameters (see MakeSeeds() function body for a detailed description)
2563 //
2564 // Output :
2565 // The TRD track.
2566 //
2567 // Detailed description
2568 //
2569 // To be discussed with Marian !!
2570 //
2571
41702fec 2572
2573 Double_t alpha = AliTRDgeometry::GetAlpha();
2574 Double_t shift = AliTRDgeometry::GetAlpha()/2.0;
2575 Double_t c[15];
2576
2577 c[ 0] = 0.2;
2578 c[ 1] = 0.0; c[ 2] = 2.0;
2579 c[ 3] = 0.0; c[ 4] = 0.0; c[ 5] = 0.02;
2580 c[ 6] = 0.0; c[ 7] = 0.0; c[ 8] = 0.0; c[ 9] = 0.1;
2581 c[10] = 0.0; c[11] = 0.0; c[12] = 0.0; c[13] = 0.0; c[14] = params[5]*params[5]*0.01;
2582
d20df6fc 2583 AliTRDtrackV1 track(seeds, &params[1], c, params[0], params[6]*alpha+shift);
2584 track.PropagateTo(params[0]-5.0);
f29f13a6 2585 AliTRDseedV1 *ptrTracklet = 0x0;
2586 // Sign clusters
2587 for (Int_t jLayer = 0; jLayer < AliTRDgeometry::kNlayer; jLayer++) {
2588 ptrTracklet = &seeds[jLayer];
2589 if(!ptrTracklet->IsOK()) continue;
2590 if(TMath::Abs(ptrTracklet->GetYref(1) - ptrTracklet->GetYfit(1)) >= .2) continue; // check this condition with Marian
2591 }
2592 //
91834b8d 2593 if(fReconstructor->IsHLT()){
91834b8d 2594 for(Int_t ip=0; ip<kNPlanes; ip++){
2595 track.UnsetTracklet(ip);
2596 ptrTracklet = SetTracklet(&seeds[ip]);
f29f13a6 2597 ptrTracklet->UseClusters();
91834b8d 2598 track.SetTracklet(ptrTracklet, fTracklets->GetEntriesFast()-1);
2599 }
d78d7df0 2600 AliTRDtrackV1 *ptrTrack = SetTrack(&track);
2601 ptrTrack->SetReconstructor(fReconstructor);
2602 return ptrTrack;
91834b8d 2603 }
393fda1c 2604
d20df6fc 2605 track.ResetCovariance(1);
e79f8eb0 2606 Int_t nc = TMath::Abs(FollowBackProlongation(track));
393fda1c 2607 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 5){
2608 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2609 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2610 Double_t p[5]; // Track Params for the Debug Stream
2611 track.GetExternalParameters(params[0], p);
29f95561 2612 TTreeSRedirector &cs = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
393fda1c 2613 cs << "MakeTrack"
2614 << "EventNumber=" << eventNumber
2615 << "CandidateNumber=" << candidateNumber
2616 << "nc=" << nc
2617 << "X=" << params[0]
2618 << "Y=" << p[0]
2619 << "Z=" << p[1]
2620 << "snp=" << p[2]
2621 << "tnd=" << p[3]
2622 << "crv=" << p[4]
2623 << "Yin=" << params[1]
2624 << "Zin=" << params[2]
2625 << "snpin=" << params[3]
2626 << "tndin=" << params[4]
2627 << "crvin=" << params[5]
2628 << "track.=" << &track
2629 << "\n";
2630 }
d20df6fc 2631 if (nc < 30) return 0x0;
2632
2633 AliTRDtrackV1 *ptrTrack = SetTrack(&track);
215f7116 2634 ptrTrack->SetReconstructor(fReconstructor);
48f8adf3 2635 ptrTrack->CookLabel(.9);
24253b0a 2636
d20df6fc 2637 // computes PID for track
2638 ptrTrack->CookPID();
2639 // update calibration references using this track
48f8adf3 2640 AliTRDCalibraFillHisto *calibra = AliTRDCalibraFillHisto::Instance();
2641 if (!calibra){
2642 AliInfo("Could not get Calibra instance\n");
2643 if(calibra->GetHisto2d()) calibra->UpdateHistogramsV1(ptrTrack);
2644 }
d20df6fc 2645 return ptrTrack;
e4f2f73d 2646}
2647
0906e73e 2648
2649//____________________________________________________________________
eb38ed55 2650Int_t AliTRDtrackerV1::ImproveSeedQuality(AliTRDtrackingChamber **stack, AliTRDseedV1 *cseed)
e4f2f73d 2651{
41702fec 2652 //
2653 // Sort tracklets according to "quality" and try to "improve" the first 4 worst
2654 //
2655 // Parameters :
2656 // layers : Array of propagation layers for a stack/supermodule
2657 // cseed : Array of 6 seeding tracklets which has to be improved
2658 //
f29f13a6 2659 // Output :
41702fec 2660 // cssed : Improved seeds
2661 //
2662 // Detailed description
2663 //
2664 // Iterative procedure in which new clusters are searched for each
2665 // tracklet seed such that the seed quality (see AliTRDseed::GetQuality())
2666 // can be maximized. If some optimization is found the old seeds are replaced.
2667 //
2668 // debug level: 7
2669 //
2670
2671 // make a local working copy
2672 AliTRDtrackingChamber *chamber = 0x0;
2673 AliTRDseedV1 bseed[6];
2674 Int_t nLayers = 0;
2675 for (Int_t jLayer = 0; jLayer < 6; jLayer++) bseed[jLayer] = cseed[jLayer];
2676
2677 Float_t lastquality = 10000.0;
2678 Float_t lastchi2 = 10000.0;
2679 Float_t chi2 = 1000.0;
2680
2681 for (Int_t iter = 0; iter < 4; iter++) {
2682 Float_t sumquality = 0.0;
2683 Float_t squality[6];
2684 Int_t sortindexes[6];
2685
2686 for (Int_t jLayer = 0; jLayer < 6; jLayer++) {
3a039a31 2687 squality[jLayer] = bseed[jLayer].IsOK() ? bseed[jLayer].GetQuality(kTRUE) : 1000.;
41702fec 2688 sumquality += squality[jLayer];
2689 }
2690 if ((sumquality >= lastquality) || (chi2 > lastchi2)) break;
2691
2692 nLayers = 0;
2693 lastquality = sumquality;
2694 lastchi2 = chi2;
2695 if (iter > 0) for (Int_t jLayer = 0; jLayer < 6; jLayer++) cseed[jLayer] = bseed[jLayer];
2696
2697 TMath::Sort(6, squality, sortindexes, kFALSE);
2698 for (Int_t jLayer = 5; jLayer > 1; jLayer--) {
2699 Int_t bLayer = sortindexes[jLayer];
2700 if(!(chamber = stack[bLayer])) continue;
f29f13a6 2701 bseed[bLayer].AttachClusters(chamber, kTRUE);
2702 bseed[bLayer].Fit(kTRUE);
41702fec 2703 if(bseed[bLayer].IsOK()) nLayers++;
2704 }
2705
2706 chi2 = FitTiltedRieman(bseed, kTRUE);
3a039a31 2707 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 7){
41702fec 2708 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2709 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2710 TLinearFitter *tiltedRieman = GetTiltedRiemanFitter();
29f95561 2711 TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
41702fec 2712 cstreamer << "ImproveSeedQuality"
2713 << "EventNumber=" << eventNumber
2714 << "CandidateNumber=" << candidateNumber
2715 << "Iteration=" << iter
2716 << "S0.=" << &bseed[0]
2717 << "S1.=" << &bseed[1]
2718 << "S2.=" << &bseed[2]
2719 << "S3.=" << &bseed[3]
2720 << "S4.=" << &bseed[4]
2721 << "S5.=" << &bseed[5]
2722 << "FitterT.=" << tiltedRieman
2723 << "\n";
2724 }
2725 } // Loop: iter
41702fec 2726 // we are sure that at least 2 tracklets are OK !
2727 return nLayers+2;
e4f2f73d 2728}
2729
eb38ed55 2730//_________________________________________________________________________
2731Double_t AliTRDtrackerV1::CalculateTrackLikelihood(AliTRDseedV1 *tracklets, Double_t *chi2){
41702fec 2732 //
2733 // Calculates the Track Likelihood value. This parameter serves as main quality criterion for
2734 // the track selection
2735 // The likelihood value containes:
2736 // - The chi2 values from the both fitters and the chi2 values in z-direction from a linear fit
2737 // - The Sum of the Parameter |slope_ref - slope_fit|/Sigma of the tracklets
2738 // For all Parameters an exponential dependency is used
2739 //
2740 // Parameters: - Array of tracklets (AliTRDseedV1) related to the track candidate
2741 // - Array of chi2 values:
2742 // * Non-Constrained Tilted Riemann fit
2743 // * Vertex-Constrained Tilted Riemann fit
2744 // * z-Direction from Linear fit
2745 // Output: - The calculated track likelihood
2746 //
2747 // debug level 2
2748 //
2749
f29f13a6 2750 Double_t chi2phi = 0, nLayers = 0;
41702fec 2751 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
2752 if(!tracklets[iLayer].IsOK()) continue;
f29f13a6 2753 chi2phi += tracklets[iLayer].GetChi2Phi();
41702fec 2754 nLayers++;
2755 }
f29f13a6 2756 chi2phi /= Float_t (nLayers - 2.0);
41702fec 2757
2758 Double_t likeChi2Z = TMath::Exp(-chi2[2] * 0.14); // Chi2Z
3a039a31 2759 Double_t likeChi2TC = (fReconstructor->GetRecoParam() ->IsVertexConstrained()) ?
d20df6fc 2760 TMath::Exp(-chi2[1] * 0.677) : 1; // Constrained Tilted Riemann
41702fec 2761 Double_t likeChi2TR = TMath::Exp(-chi2[0] * 0.78); // Non-constrained Tilted Riemann
f29f13a6 2762 Double_t likeChi2Phi= TMath::Exp(-chi2phi * 3.23);
2763 Double_t trackLikelihood = likeChi2Z * likeChi2TR * likeChi2Phi;
41702fec 2764
3a039a31 2765 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){
41702fec 2766 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2767 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
29f95561 2768 TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
41702fec 2769 cstreamer << "CalculateTrackLikelihood0"
2770 << "EventNumber=" << eventNumber
2771 << "CandidateNumber=" << candidateNumber
2772 << "LikeChi2Z=" << likeChi2Z
2773 << "LikeChi2TR=" << likeChi2TR
2774 << "LikeChi2TC=" << likeChi2TC
f29f13a6 2775 << "LikeChi2Phi=" << likeChi2Phi
41702fec 2776 << "TrackLikelihood=" << trackLikelihood
2777 << "\n";
2778 }
2779
2780 return trackLikelihood;
e4f2f73d 2781}
2782
2783//____________________________________________________________________
91834b8d 2784Double_t AliTRDtrackerV1::CookLikelihood(AliTRDseedV1 *cseed, Int_t planes[4])
e4f2f73d 2785{
41702fec 2786 //
2787 // Calculate the probability of this track candidate.
2788 //
2789 // Parameters :
2790 // cseeds : array of candidate tracklets
2791 // planes : array of seeding planes (see seeding configuration)
2792 // chi2 : chi2 values (on the Z and Y direction) from the rieman fit of the track.
2793 //
2794 // Output :
2795 // likelihood value
2796 //
2797 // Detailed description
2798 //
2799 // The track quality is estimated based on the following 4 criteria:
2800 // 1. precision of the rieman fit on the Y direction (likea)
2801 // 2. chi2 on the Y direction (likechi2y)
2802 // 3. chi2 on the Z direction (likechi2z)
2803 // 4. number of attached clusters compared to a reference value
2804 // (see AliTRDrecoParam::fkFindable) (likeN)
2805 //
2806 // The distributions for each type of probabilities are given below as of
2807 // (date). They have to be checked to assure consistency of estimation.
2808 //
2809
2810 // ratio of the total number of clusters/track which are expected to be found by the tracker.
91834b8d 2811 const AliTRDrecoParam *fRecoPars = fReconstructor->GetRecoParam();
41702fec 2812
91834b8d 2813 Double_t chi2y = GetChi2Y(&cseed[0]);
2814 Double_t chi2z = GetChi2Z(&cseed[0]);
2815
8ae98148 2816 Float_t nclusters = 0.;
41702fec 2817 Double_t sumda = 0.;
2818 for(UChar_t ilayer = 0; ilayer < 4; ilayer++){
2819 Int_t jlayer = planes[ilayer];
2820 nclusters += cseed[jlayer].GetN2();
e3cf3d02 2821 sumda += TMath::Abs(cseed[jlayer].GetYfit(1) - cseed[jlayer].GetYref(1));
41702fec 2822 }
8ae98148 2823 nclusters *= .25;
2824
5a2e200c 2825 Double_t likea = TMath::Exp(-sumda * fRecoPars->GetPhiSlope());
41702fec 2826 Double_t likechi2y = 0.0000000001;
5a2e200c 2827 if (fReconstructor->IsCosmic() || chi2y < fRecoPars->GetChi2YCut()) likechi2y += TMath::Exp(-TMath::Sqrt(chi2y) * fRecoPars->GetChi2YSlope());
2828 Double_t likechi2z = TMath::Exp(-chi2z * fRecoPars->GetChi2ZSlope());
8ae98148 2829 Double_t likeN = TMath::Exp(-(fRecoPars->GetNMeanClusters() - nclusters) / fRecoPars->GetNSigmaClusters());
41702fec 2830 Double_t like = likea * likechi2y * likechi2z * likeN;
2831
2832 // 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 2833 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){
41702fec 2834 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2835 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
91834b8d 2836 Int_t nTracklets = 0; Float_t mean_ncls = 0;
2837 for(Int_t iseed=0; iseed < kNPlanes; iseed++){
2838 if(!cseed[iseed].IsOK()) continue;
2839 nTracklets++;
2840 mean_ncls += cseed[iseed].GetN2();
2841 }
2842 if(nTracklets) mean_ncls /= nTracklets;
41702fec 2843 // The Debug Stream contains the seed
29f95561 2844 TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
41702fec 2845 cstreamer << "CookLikelihood"
2846 << "EventNumber=" << eventNumber
2847 << "CandidateNumber=" << candidateNumber
2848 << "tracklet0.=" << &cseed[0]
2849 << "tracklet1.=" << &cseed[1]
2850 << "tracklet2.=" << &cseed[2]
2851 << "tracklet3.=" << &cseed[3]
2852 << "tracklet4.=" << &cseed[4]
2853 << "tracklet5.=" << &cseed[5]
2854 << "sumda=" << sumda
91834b8d 2855 << "chi2y=" << chi2y
2856 << "chi2z=" << chi2z
41702fec 2857 << "likea=" << likea
2858 << "likechi2y=" << likechi2y
2859 << "likechi2z=" << likechi2z
2860 << "nclusters=" << nclusters
2861 << "likeN=" << likeN
2862 << "like=" << like
91834b8d 2863 << "meanncls=" << mean_ncls
41702fec 2864 << "\n";
2865 }
2866
2867 return like;
e4f2f73d 2868}
2869
e4f2f73d 2870//____________________________________________________________________
0906e73e 2871void AliTRDtrackerV1::GetSeedingConfig(Int_t iconfig, Int_t planes[4])
e4f2f73d 2872{
41702fec 2873 //
2874 // Map seeding configurations to detector planes.
2875 //
2876 // Parameters :
2877 // iconfig : configuration index
2878 // planes : member planes of this configuration. On input empty.
2879 //
2880 // Output :
2881 // planes : contains the planes which are defining the configuration
2882 //
2883 // Detailed description
2884 //
2885 // Here is the list of seeding planes configurations together with
2886 // their topological classification:
2887 //
2888 // 0 - 5432 TQ 0
2889 // 1 - 4321 TQ 0
2890 // 2 - 3210 TQ 0
2891 // 3 - 5321 TQ 1
2892 // 4 - 4210 TQ 1
2893 // 5 - 5431 TQ 1
2894 // 6 - 4320 TQ 1
2895 // 7 - 5430 TQ 2
2896 // 8 - 5210 TQ 2
2897 // 9 - 5421 TQ 3
2898 // 10 - 4310 TQ 3
2899 // 11 - 5410 TQ 4
2900 // 12 - 5420 TQ 5
2901 // 13 - 5320 TQ 5
2902 // 14 - 5310 TQ 5
2903 //
2904 // The topologic quality is modeled as follows:
2905 // 1. The general model is define by the equation:
2906 // p(conf) = exp(-conf/2)
2907 // 2. According to the topologic classification, configurations from the same
2908 // class are assigned the agerage value over the model values.
2909 // 3. Quality values are normalized.
2910 //
2911 // The topologic quality distribution as function of configuration is given below:
2912 //Begin_Html
2913 // <img src="gif/topologicQA.gif">
2914 //End_Html
2915 //
2916
2917 switch(iconfig){
2918 case 0: // 5432 TQ 0
2919 planes[0] = 2;
2920 planes[1] = 3;
2921 planes[2] = 4;
2922 planes[3] = 5;
2923 break;
2924 case 1: // 4321 TQ 0
2925 planes[0] = 1;
2926 planes[1] = 2;
2927 planes[2] = 3;
2928 planes[3] = 4;
2929 break;
2930 case 2: // 3210 TQ 0
2931 planes[0] = 0;
2932 planes[1] = 1;
2933 planes[2] = 2;
2934 planes[3] = 3;
2935 break;
2936 case 3: // 5321 TQ 1
2937 planes[0] = 1;
2938 planes[1] = 2;
2939 planes[2] = 3;
2940 planes[3] = 5;
2941 break;
2942 case 4: // 4210 TQ 1
2943 planes[0] = 0;
2944 planes[1] = 1;
2945 planes[2] = 2;
2946 planes[3] = 4;
2947 break;
2948 case 5: // 5431 TQ 1
2949 planes[0] = 1;
2950 planes[1] = 3;
2951 planes[2] = 4;
2952 planes[3] = 5;
2953 break;
2954 case 6: // 4320 TQ 1
2955 planes[0] = 0;
2956 planes[1] = 2;
2957 planes[2] = 3;
2958 planes[3] = 4;
2959 break;
2960 case 7: // 5430 TQ 2
2961 planes[0] = 0;
2962 planes[1] = 3;
2963 planes[2] = 4;
2964 planes[3] = 5;
2965 break;
2966 case 8: // 5210 TQ 2
2967 planes[0] = 0;
2968 planes[1] = 1;
2969 planes[2] = 2;
2970 planes[3] = 5;
2971 break;
2972 case 9: // 5421 TQ 3
2973 planes[0] = 1;
2974 planes[1] = 2;
2975 planes[2] = 4;
2976 planes[3] = 5;
2977 break;
2978 case 10: // 4310 TQ 3
2979 planes[0] = 0;
2980 planes[1] = 1;
2981 planes[2] = 3;
2982 planes[3] = 4;
2983 break;
2984 case 11: // 5410 TQ 4
2985 planes[0] = 0;
2986 planes[1] = 1;
2987 planes[2] = 4;
2988 planes[3] = 5;
2989 break;
2990 case 12: // 5420 TQ 5
2991 planes[0] = 0;
2992 planes[1] = 2;
2993 planes[2] = 4;
2994 planes[3] = 5;
2995 break;
2996 case 13: // 5320 TQ 5
2997 planes[0] = 0;
2998 planes[1] = 2;
2999 planes[2] = 3;
3000 planes[3] = 5;
3001 break;
3002 case 14: // 5310 TQ 5
3003 planes[0] = 0;
3004 planes[1] = 1;
3005 planes[2] = 3;
3006 planes[3] = 5;
3007 break;
3008 }
e4f2f73d 3009}
3010
3011//____________________________________________________________________
0906e73e 3012void AliTRDtrackerV1::GetExtrapolationConfig(Int_t iconfig, Int_t planes[2])
e4f2f73d 3013{
41702fec 3014 //
3015 // Returns the extrapolation planes for a seeding configuration.
3016 //
3017 // Parameters :
3018 // iconfig : configuration index
3019 // planes : planes which are not in this configuration. On input empty.
3020 //
3021 // Output :
3022 // planes : contains the planes which are not in the configuration
3023 //
3024 // Detailed description
3025 //
3026
3027 switch(iconfig){
3028 case 0: // 5432 TQ 0
3029 planes[0] = 1;
3030 planes[1] = 0;
3031 break;
3032 case 1: // 4321 TQ 0
3033 planes[0] = 5;
3034 planes[1] = 0;
3035 break;
3036 case 2: // 3210 TQ 0
3037 planes[0] = 4;
3038 planes[1] = 5;
3039 break;
3040 case 3: // 5321 TQ 1
3041 planes[0] = 4;
3042 planes[1] = 0;
3043 break;
3044 case 4: // 4210 TQ 1
3045 planes[0] = 5;
3046 planes[1] = 3;
3047 break;
3048 case 5: // 5431 TQ 1
3049 planes[0] = 2;
3050 planes[1] = 0;
3051 break;
3052 case 6: // 4320 TQ 1
3053 planes[0] = 5;
3054 planes[1] = 1;
3055 break;
3056 case 7: // 5430 TQ 2
3057 planes[0] = 2;
3058 planes[1] = 1;
3059 break;
3060 case 8: // 5210 TQ 2
3061 planes[0] = 4;
3062 planes[1] = 3;
3063 break;
3064 case 9: // 5421 TQ 3
3065 planes[0] = 3;
3066 planes[1] = 0;
3067 break;
3068 case 10: // 4310 TQ 3
3069 planes[0] = 5;
3070 planes[1] = 2;
3071 break;
3072 case 11: // 5410 TQ 4
3073 planes[0] = 3;
3074 planes[1] = 2;
3075 break;
3076 case 12: // 5420 TQ 5
3077 planes[0] = 3;
3078 planes[1] = 1;
3079 break;
3080 case 13: // 5320 TQ 5
3081 planes[0] = 4;
3082 planes[1] = 1;
3083 break;
3084 case 14: // 5310 TQ 5
3085 planes[0] = 4;
3086 planes[1] = 2;
3087 break;
3088 }
e4f2f73d 3089}
eb38ed55 3090
3091//____________________________________________________________________
3092AliCluster* AliTRDtrackerV1::GetCluster(Int_t idx) const
3093{
41702fec 3094 Int_t ncls = fClusters->GetEntriesFast();
2f7514a6 3095 return idx >= 0 && idx < ncls ? (AliCluster*)fClusters->UncheckedAt(idx) : 0x0;
eb38ed55 3096}
3097
bb56afff 3098//____________________________________________________________________
3b57a3f7 3099AliTRDseedV1* AliTRDtrackerV1::GetTracklet(Int_t idx) const
3100{
41702fec 3101 Int_t ntrklt = fTracklets->GetEntriesFast();
2f7514a6 3102 return idx >= 0 && idx < ntrklt ? (AliTRDseedV1*)fTracklets->UncheckedAt(idx) : 0x0;
3b57a3f7 3103}
3104
3105//____________________________________________________________________
3106AliKalmanTrack* AliTRDtrackerV1::GetTrack(Int_t idx) const
3107{
41702fec 3108 Int_t ntrk = fTracks->GetEntriesFast();
2f7514a6 3109 return idx >= 0 && idx < ntrk ? (AliKalmanTrack*)fTracks->UncheckedAt(idx) : 0x0;
3b57a3f7 3110}
3111
3112//____________________________________________________________________
bb56afff 3113Float_t AliTRDtrackerV1::CalculateReferenceX(AliTRDseedV1 *tracklets){
41702fec 3114 //
3115 // Calculates the reference x-position for the tilted Rieman fit defined as middle
3116 // of the stack (middle between layers 2 and 3). For the calculation all the tracklets
3117 // are taken into account
3118 //
3119 // Parameters: - Array of tracklets(AliTRDseedV1)
3120 //
3121 // Output: - The reference x-position(Float_t)
3122 //
3123 Int_t nDistances = 0;
3124 Float_t meanDistance = 0.;
3125 Int_t startIndex = 5;
3126 for(Int_t il =5; il > 0; il--){
3127 if(tracklets[il].IsOK() && tracklets[il -1].IsOK()){
3128 Float_t xdiff = tracklets[il].GetX0() - tracklets[il -1].GetX0();
3129 meanDistance += xdiff;
3130 nDistances++;
3131 }
3132 if(tracklets[il].IsOK()) startIndex = il;
3133 }
3134 if(tracklets[0].IsOK()) startIndex = 0;
3135 if(!nDistances){
3136 // We should normally never get here
3137 Float_t xpos[2]; memset(xpos, 0, sizeof(Float_t) * 2);
3138 Int_t iok = 0, idiff = 0;
3139 // This attempt is worse and should be avoided:
3140 // check for two chambers which are OK and repeat this without taking the mean value
3141 // Strategy avoids a division by 0;
3142 for(Int_t il = 5; il >= 0; il--){
3143 if(tracklets[il].IsOK()){
3144 xpos[iok] = tracklets[il].GetX0();
3145 iok++;
3146 startIndex = il;
3147 }
3148 if(iok) idiff++; // to get the right difference;
3149 if(iok > 1) break;
3150 }
3151 if(iok > 1){
3152 meanDistance = (xpos[0] - xpos[1])/idiff;
3153 }
3154 else{
3155 // we have do not even have 2 layers which are OK? The we do not need to fit at all
3156 return 331.;
3157 }
3158 }
3159 else{
3160 meanDistance /= nDistances;
3161 }
3162 return tracklets[startIndex].GetX0() + (2.5 - startIndex) * meanDistance - 0.5 * (AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick());
bb56afff 3163}
eb38ed55 3164
fac58f00 3165// //_____________________________________________________________________________
3166// Int_t AliTRDtrackerV1::Freq(Int_t n, const Int_t *inlist
3167// , Int_t *outlist, Bool_t down)
3168// {
3169// //
3170// // Sort eleements according occurancy
3171// // The size of output array has is 2*n
3172// //
3173//
3174// if (n <= 0) {
3175// return 0;
3176// }
3177//
3178// Int_t *sindexS = new Int_t[n]; // Temporary array for sorting
3179// Int_t *sindexF = new Int_t[2*n];
3180// for (Int_t i = 0; i < n; i++) {
3181// sindexF[i] = 0;
3182// }
3183//
3184// TMath::Sort(n,inlist,sindexS,down);
3185//
3186// Int_t last = inlist[sindexS[0]];
3187// Int_t val = last;
3188// sindexF[0] = 1;
3189// sindexF[0+n] = last;
3190// Int_t countPos = 0;
3191//
3192// // Find frequency
3193// for (Int_t i = 1; i < n; i++) {
3194// val = inlist[sindexS[i]];
3195// if (last == val) {
3196// sindexF[countPos]++;
3197// }
3198// else {
3199// countPos++;
3200// sindexF[countPos+n] = val;
3201// sindexF[countPos]++;
3202// last = val;
3203// }
3204// }
3205// if (last == val) {
3206// countPos++;
3207// }
3208//
3209// // Sort according frequency
3210// TMath::Sort(countPos,sindexF,sindexS,kTRUE);
3211//
3212// for (Int_t i = 0; i < countPos; i++) {
3213// outlist[2*i ] = sindexF[sindexS[i]+n];
3214// outlist[2*i+1] = sindexF[sindexS[i]];
3215// }
3216//
3217// delete [] sindexS;
3218// delete [] sindexF;
3219//
3220// return countPos;
3221//
3222// }
bb56afff 3223
06b32d95 3224
3225//____________________________________________________________________
d611c74f 3226void AliTRDtrackerV1::ResetSeedTB()
3227{
3228// reset buffer for seeding time bin layers. If the time bin
3229// layers are not allocated this function allocates them
3230
3231 for(Int_t isl=0; isl<kNSeedPlanes; isl++){
3232 if(!fSeedTB[isl]) fSeedTB[isl] = new AliTRDchamberTimeBin();
3233 else fSeedTB[isl]->Clear();
3234 }
3235}
3236
e3cf3d02 3237
3238//_____________________________________________________________________________
3239Float_t AliTRDtrackerV1::GetChi2Y(AliTRDseedV1 *tracklets) const
3240{
3241 // Calculates normalized chi2 in y-direction
3242 // chi2 = Sum chi2 / n_tracklets
3243
3244 Double_t chi2 = 0.; Int_t n = 0;
3245 for(Int_t ipl = kNPlanes; ipl--;){
3246 if(!tracklets[ipl].IsOK()) continue;
3247 chi2 += tracklets[ipl].GetChi2Y();
3248 n++;
3249 }
3250 return n ? chi2/n : 0.;
3251}
3252
bb56afff 3253//_____________________________________________________________________________
3254Float_t AliTRDtrackerV1::GetChi2Z(AliTRDseedV1 *tracklets) const
3255{
91834b8d 3256 // Calculates normalized chi2 in z-direction
e3cf3d02 3257 // chi2 = Sum chi2 / n_tracklets
41702fec 3258
e3cf3d02 3259 Double_t chi2 = 0; Int_t n = 0;
3260 for(Int_t ipl = kNPlanes; ipl--;){
41702fec 3261 if(!tracklets[ipl].IsOK()) continue;
e3cf3d02 3262 chi2 += tracklets[ipl].GetChi2Z();
3263 n++;
41702fec 3264 }
e3cf3d02 3265 return n ? chi2/n : 0.;
bb56afff 3266}
8acca6a3 3267
3268///////////////////////////////////////////////////////
3269// //
3270// Resources of class AliTRDLeastSquare //
3271// //
3272///////////////////////////////////////////////////////
3273
3274//_____________________________________________________________________________
3275AliTRDtrackerV1::AliTRDLeastSquare::AliTRDLeastSquare(){
41702fec 3276 //
3277 // Constructor of the nested class AliTRDtrackFitterLeastSquare
3278 //
3279 memset(fParams, 0, sizeof(Double_t) * 2);
3280 memset(fSums, 0, sizeof(Double_t) * 5);
3281 memset(fCovarianceMatrix, 0, sizeof(Double_t) * 3);
8acca6a3 3282
3283}
3284
3285//_____________________________________________________________________________
3286void AliTRDtrackerV1::AliTRDLeastSquare::AddPoint(Double_t *x, Double_t y, Double_t sigmaY){
41702fec 3287 //
3288 // Adding Point to the fitter
3289 //
3290 Double_t weight = 1/(sigmaY * sigmaY);
3291 Double_t &xpt = *x;
3292 // printf("Adding point x = %f, y = %f, sigma = %f\n", xpt, y, sigmaY);
3293 fSums[0] += weight;
3294 fSums[1] += weight * xpt;
3295 fSums[2] += weight * y;
3296 fSums[3] += weight * xpt * y;
3297 fSums[4] += weight * xpt * xpt;
3298 fSums[5] += weight * y * y;
8acca6a3 3299}
3300
3301//_____________________________________________________________________________
3302void AliTRDtrackerV1::AliTRDLeastSquare::RemovePoint(Double_t *x, Double_t y, Double_t sigmaY){
41702fec 3303 //
3304 // Remove Point from the sample
3305 //
3306 Double_t weight = 1/(sigmaY * sigmaY);
3307 Double_t &xpt = *x;
3308 fSums[0] -= weight;
3309 fSums[1] -= weight * xpt;
3310 fSums[2] -= weight * y;
3311 fSums[3] -= weight * xpt * y;
3312 fSums[4] -= weight * xpt * xpt;
3313 fSums[5] -= weight * y * y;
8acca6a3 3314}
3315
3316//_____________________________________________________________________________
3317void AliTRDtrackerV1::AliTRDLeastSquare::Eval(){
41702fec 3318 //
3319 // Evaluation of the fit:
3320 // Calculation of the parameters
3321 // Calculation of the covariance matrix
3322 //
3323
3324 Double_t denominator = fSums[0] * fSums[4] - fSums[1] *fSums[1];
aec26713 3325 if(denominator==0) return;
3326
41702fec 3327 // for(Int_t isum = 0; isum < 5; isum++)
3328 // printf("fSums[%d] = %f\n", isum, fSums[isum]);
3329 // printf("denominator = %f\n", denominator);
3330 fParams[0] = (fSums[2] * fSums[4] - fSums[1] * fSums[3])/ denominator;
3331 fParams[1] = (fSums[0] * fSums[3] - fSums[1] * fSums[2]) / denominator;
3332 // printf("fParams[0] = %f, fParams[1] = %f\n", fParams[0], fParams[1]);
3333
3334 // Covariance matrix
3335 fCovarianceMatrix[0] = fSums[4] - fSums[1] * fSums[1] / fSums[0];
3336 fCovarianceMatrix[1] = fSums[5] - fSums[2] * fSums[2] / fSums[0];
3337 fCovarianceMatrix[2] = fSums[3] - fSums[1] * fSums[2] / fSums[0];
8acca6a3 3338}
3339
46b6abd7 3340//_____________________________________________________________________________
3341Double_t AliTRDtrackerV1::AliTRDLeastSquare::GetFunctionValue(Double_t *xpos) const {
41702fec 3342 //
3343 // Returns the Function value of the fitted function at a given x-position
3344 //
3345 return fParams[0] + fParams[1] * (*xpos);
46b6abd7 3346}
3347
3348//_____________________________________________________________________________
3349void AliTRDtrackerV1::AliTRDLeastSquare::GetCovarianceMatrix(Double_t *storage) const {
41702fec 3350 //
3351 // Copies the values of the covariance matrix into the storage
3352 //
3353 memcpy(storage, fCovarianceMatrix, sizeof(Double_t) * 3);
46b6abd7 3354}
3355