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e4f2f73d 1/**************************************************************************
972ef65e 2* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
3* *
4* Author: The ALICE Off-line Project. *
5* Contributors are mentioned in the code where appropriate. *
6* *
7* Permission to use, copy, modify and distribute this software and its *
8* documentation strictly for non-commercial purposes is hereby granted *
9* without fee, provided that the above copyright notice appears in all *
10* copies and that both the copyright notice and this permission notice *
11* appear in the supporting documentation. The authors make no claims *
12* about the suitability of this software for any purpose. It is *
13* provided "as is" without express or implied warranty. *
14**************************************************************************/
e4f2f73d 15
16/* $Id$ */
17
18///////////////////////////////////////////////////////////////////////////////
19// //
20// Track finder //
21// //
22// Authors: //
23// Alex Bercuci <A.Bercuci@gsi.de> //
24// Markus Fasel <M.Fasel@gsi.de> //
25// //
26///////////////////////////////////////////////////////////////////////////////
27
bb56afff 28// #include <Riostream.h>
29// #include <stdio.h>
30// #include <string.h>
e4f2f73d 31
32#include <TBranch.h>
bb56afff 33#include <TDirectory.h>
e4f2f73d 34#include <TLinearFitter.h>
e4f2f73d 35#include <TTree.h>
36#include <TClonesArray.h>
e4f2f73d 37#include <TTreeStream.h>
eb2b4f91 38#include <TGeoMatrix.h>
39#include <TGeoManager.h>
e4f2f73d 40
41#include "AliLog.h"
fac58f00 42#include "AliMathBase.h"
e4f2f73d 43#include "AliESDEvent.h"
bb56afff 44#include "AliGeomManager.h"
e4f2f73d 45#include "AliRieman.h"
46#include "AliTrackPointArray.h"
47
e4f2f73d 48#include "AliTRDgeometry.h"
49#include "AliTRDpadPlane.h"
e4f2f73d 50#include "AliTRDcalibDB.h"
e4f2f73d 51#include "AliTRDReconstructor.h"
52#include "AliTRDCalibraFillHisto.h"
e4f2f73d 53#include "AliTRDrecoParam.h"
bb56afff 54
55#include "AliTRDcluster.h"
e4f2f73d 56#include "AliTRDseedV1.h"
0906e73e 57#include "AliTRDtrackV1.h"
bb56afff 58#include "AliTRDtrackerV1.h"
59#include "AliTRDtrackerDebug.h"
60#include "AliTRDtrackingChamber.h"
61#include "AliTRDchamberTimeBin.h"
62
e4f2f73d 63
e4f2f73d 64
65ClassImp(AliTRDtrackerV1)
eb38ed55 66
67
68const Float_t AliTRDtrackerV1::fgkMinClustersInTrack = 0.5; //
69const Float_t AliTRDtrackerV1::fgkLabelFraction = 0.8; //
70const Double_t AliTRDtrackerV1::fgkMaxChi2 = 12.0; //
71const Double_t AliTRDtrackerV1::fgkMaxSnp = 0.95; // Maximum local sine of the azimuthal angle
72const Double_t AliTRDtrackerV1::fgkMaxStep = 2.0; // Maximal step size in propagation
d76231c8 73Double_t AliTRDtrackerV1::fgTopologicQA[kNConfigs] = {
41702fec 74 0.1112, 0.1112, 0.1112, 0.0786, 0.0786,
75 0.0786, 0.0786, 0.0579, 0.0579, 0.0474,
76 0.0474, 0.0408, 0.0335, 0.0335, 0.0335
e165b64b 77};
78const Double_t AliTRDtrackerV1::fgkX0[kNPlanes] = {
79 300.2, 312.8, 325.4, 338.0, 350.6, 363.2};
2985ffcb 80Int_t AliTRDtrackerV1::fgNTimeBins = 0;
eb38ed55 81AliRieman* AliTRDtrackerV1::fgRieman = 0x0;
82TLinearFitter* AliTRDtrackerV1::fgTiltedRieman = 0x0;
83TLinearFitter* AliTRDtrackerV1::fgTiltedRiemanConstrained = 0x0;
e4f2f73d 84
85//____________________________________________________________________
3a039a31 86AliTRDtrackerV1::AliTRDtrackerV1(AliTRDReconstructor *rec)
41702fec 87 :AliTracker()
06b32d95 88 ,fReconstructor(0x0)
eb2b4f91 89 ,fGeom(0x0)
41702fec 90 ,fClusters(0x0)
91 ,fTracklets(0x0)
92 ,fTracks(0x0)
93 ,fSieveSeeding(0)
e4f2f73d 94{
41702fec 95 //
96 // Default constructor.
97 //
eb2b4f91 98
99 SetReconstructor(rec); // initialize reconstructor
100
101 // initialize geometry
102 if(!AliGeomManager::GetGeometry()){
103 AliFatal("Could not get geometry.");
104 }
105 fGeom = new AliTRDgeometry();
106 fGeom->CreateClusterMatrixArray();
107 TGeoHMatrix *matrix = 0x0;
108 Double_t loc[] = {0., 0., 0.};
109 Double_t glb[] = {0., 0., 0.};
110 for(Int_t ily=kNPlanes; ily--;){
e165b64b 111 Int_t ism = 0;
112 while(!(matrix = fGeom->GetClusterMatrix(AliTRDgeometry::GetDetector(ily, 2, ism)))) ism++;
113 if(!matrix){
114 AliError(Form("Could not get transformation matrix for layer %d. Use default.", ily));
115 fR[ily] = fgkX0[ily];
eb2b4f91 116 continue;
117 }
118 matrix->LocalToMaster(loc, glb);
119 fR[ily] = glb[0]+ AliTRDgeometry::AnodePos()-.5*AliTRDgeometry::AmThick() - AliTRDgeometry::DrThick();
120 }
121
122 // initialize calibration values
a7ac01d2 123 AliTRDcalibDB *trd = 0x0;
124 if (!(trd = AliTRDcalibDB::Instance())) {
eb2b4f91 125 AliFatal("Could not get calibration.");
41702fec 126 }
a7ac01d2 127 if(!fgNTimeBins) fgNTimeBins = trd->GetNumberOfTimeBins();
41702fec 128
eb2b4f91 129 // initialize cluster containers
053767a4 130 for (Int_t isector = 0; isector < AliTRDgeometry::kNsector; isector++) new(&fTrSec[isector]) AliTRDtrackingSector(fGeom, isector);
3a039a31 131
eb2b4f91 132 // initialize arrays
133 memset(fTrackQuality, 0, kMaxTracksStack*sizeof(Double_t));
134 memset(fSeedLayer, 0, kMaxTracksStack*sizeof(Int_t));
135 memset(fSeedTB, 0, kNSeedPlanes*sizeof(AliTRDchamberTimeBin*));
eb38ed55 136}
137
e4f2f73d 138//____________________________________________________________________
139AliTRDtrackerV1::~AliTRDtrackerV1()
140{
41702fec 141 //
142 // Destructor
143 //
144
f7ab3117 145 if(fgRieman) delete fgRieman; fgRieman = 0x0;
146 if(fgTiltedRieman) delete fgTiltedRieman; fgTiltedRieman = 0x0;
147 if(fgTiltedRiemanConstrained) delete fgTiltedRiemanConstrained; fgTiltedRiemanConstrained = 0x0;
d611c74f 148 for(Int_t isl =0; isl<kNSeedPlanes; isl++) if(fSeedTB[isl]) delete fSeedTB[isl];
41702fec 149 if(fTracks) {fTracks->Delete(); delete fTracks;}
150 if(fTracklets) {fTracklets->Delete(); delete fTracklets;}
48f8adf3 151 if(fClusters) {
152 fClusters->Delete(); delete fClusters;
153 }
41702fec 154 if(fGeom) delete fGeom;
e4f2f73d 155}
156
157//____________________________________________________________________
158Int_t AliTRDtrackerV1::Clusters2Tracks(AliESDEvent *esd)
159{
41702fec 160 //
161 // Steering stand alone tracking for full TRD detector
162 //
163 // Parameters :
164 // esd : The ESD event. On output it contains
165 // the ESD tracks found in TRD.
166 //
167 // Output :
168 // Number of tracks found in the TRD detector.
169 //
170 // Detailed description
171 // 1. Launch individual SM trackers.
172 // See AliTRDtrackerV1::Clusters2TracksSM() for details.
173 //
174
3a039a31 175 if(!fReconstructor->GetRecoParam() ){
176 AliError("Reconstruction configuration not initialized. Call first AliTRDReconstructor::SetRecoParam().");
41702fec 177 return 0;
178 }
179
180 //AliInfo("Start Track Finder ...");
181 Int_t ntracks = 0;
053767a4 182 for(int ism=0; ism<AliTRDgeometry::kNsector; ism++){
41702fec 183 // for(int ism=1; ism<2; ism++){
184 //AliInfo(Form("Processing supermodule %i ...", ism));
185 ntracks += Clusters2TracksSM(ism, esd);
186 }
187 AliInfo(Form("Number of found tracks : %d", ntracks));
188 return ntracks;
e4f2f73d 189}
190
0906e73e 191
192//_____________________________________________________________________________
eb38ed55 193Bool_t AliTRDtrackerV1::GetTrackPoint(Int_t index, AliTrackPoint &p) const
0906e73e 194{
41702fec 195 //AliInfo(Form("Asking for tracklet %d", index));
196
84eab75a 197 // reset position of the point before using it
198 p.SetXYZ(0., 0., 0.);
2f7514a6 199 AliTRDseedV1 *tracklet = GetTracklet(index);
200 if (!tracklet) return kFALSE;
84eab75a 201
41702fec 202 // get detector for this tracklet
e165b64b 203 Int_t det = tracklet->GetDetector();
204 Int_t sec = fGeom->GetSector(det);
205 Double_t alpha = (sec+.5)*AliTRDgeometry::GetAlpha(),
206 sinA = TMath::Sin(alpha),
207 cosA = TMath::Cos(alpha);
41702fec 208 Double_t local[3];
e165b64b 209 local[0] = tracklet->GetX();
210 local[1] = tracklet->GetY();
211 local[2] = tracklet->GetZ();
41702fec 212 Double_t global[3];
e165b64b 213 fGeom->RotateBack(det, local, global);
214
215 Double_t cov2D[3]; Float_t cov[6];
216 tracklet->GetCovAt(local[0], cov2D);
217 cov[0] = cov2D[0]*sinA*sinA;
218 cov[1] =-cov2D[0]*sinA*cosA;
219 cov[2] =-cov2D[1]*sinA;
220 cov[3] = cov2D[0]*cosA*cosA;
221 cov[4] = cov2D[1]*cosA;
222 cov[5] = cov2D[2];
223 // store the global position of the tracklet and its covariance matrix in the track point
224 p.SetXYZ(global[0],global[1],global[2], cov);
41702fec 225
226 // setting volume id
e165b64b 227 AliGeomManager::ELayerID iLayer = AliGeomManager::ELayerID(AliGeomManager::kTRD1+fGeom->GetLayer(det));
228 Int_t modId = fGeom->GetSector(det) * AliTRDgeometry::kNstack + fGeom->GetStack(det);
41702fec 229 UShort_t volid = AliGeomManager::LayerToVolUID(iLayer, modId);
230 p.SetVolumeID(volid);
231
232 return kTRUE;
0906e73e 233}
234
eb38ed55 235//____________________________________________________________________
236TLinearFitter* AliTRDtrackerV1::GetTiltedRiemanFitter()
237{
41702fec 238 if(!fgTiltedRieman) fgTiltedRieman = new TLinearFitter(4, "hyp4");
239 return fgTiltedRieman;
eb38ed55 240}
0906e73e 241
eb38ed55 242//____________________________________________________________________
243TLinearFitter* AliTRDtrackerV1::GetTiltedRiemanFitterConstraint()
244{
41702fec 245 if(!fgTiltedRiemanConstrained) fgTiltedRiemanConstrained = new TLinearFitter(2, "hyp2");
246 return fgTiltedRiemanConstrained;
eb38ed55 247}
41702fec 248
eb38ed55 249//____________________________________________________________________
250AliRieman* AliTRDtrackerV1::GetRiemanFitter()
251{
fac58f00 252 if(!fgRieman) fgRieman = new AliRieman(AliTRDseedV1::kNtb * AliTRDgeometry::kNlayer);
41702fec 253 return fgRieman;
eb38ed55 254}
41702fec 255
0906e73e 256//_____________________________________________________________________________
257Int_t AliTRDtrackerV1::PropagateBack(AliESDEvent *event)
258{
41702fec 259 //
260 // Gets seeds from ESD event. The seeds are AliTPCtrack's found and
261 // backpropagated by the TPC tracker. Each seed is first propagated
262 // to the TRD, and then its prolongation is searched in the TRD.
263 // If sufficiently long continuation of the track is found in the TRD
264 // the track is updated, otherwise it's stored as originaly defined
265 // by the TPC tracker.
266 //
267
268 // Calibration monitor
269 AliTRDCalibraFillHisto *calibra = AliTRDCalibraFillHisto::Instance();
270 if (!calibra) AliInfo("Could not get Calibra instance\n");
271
eb2b4f91 272 // Define scalers
273 Int_t nFound = 0, // number of tracks found
274 nSeeds = 0, // total number of ESD seeds
275 nTRDseeds= 0, // number of seeds in the TRD acceptance
276 nTPCseeds= 0; // number of TPC seeds
41702fec 277 Float_t foundMin = 20.0;
278
d611c74f 279 Float_t *quality = 0x0;
280 Int_t *index = 0x0;
eb2b4f91 281 nSeeds = event->GetNumberOfTracks();
282 // Sort tracks according to quality
283 // (covariance in the yz plane)
284 if(nSeeds){
285 quality = new Float_t[nSeeds];
286 index = new Int_t[nSeeds];
287 for (Int_t iSeed = nSeeds; iSeed--;) {
d611c74f 288 AliESDtrack *seed = event->GetTrack(iSeed);
289 Double_t covariance[15];
290 seed->GetExternalCovariance(covariance);
291 quality[iSeed] = covariance[0] + covariance[2];
292 }
eb2b4f91 293 TMath::Sort(nSeeds, quality, index,kFALSE);
41702fec 294 }
41702fec 295
eb2b4f91 296 // Propagate all seeds
41702fec 297 Int_t expectedClr;
298 AliTRDtrackV1 track;
eb2b4f91 299 for (Int_t iSeed = 0; iSeed < nSeeds; iSeed++) {
41702fec 300
301 // Get the seeds in sorted sequence
302 AliESDtrack *seed = event->GetTrack(index[iSeed]);
eb2b4f91 303 Float_t p4 = seed->GetC(seed->GetBz());
41702fec 304
305 // Check the seed status
306 ULong_t status = seed->GetStatus();
307 if ((status & AliESDtrack::kTPCout) == 0) continue;
308 if ((status & AliESDtrack::kTRDout) != 0) continue;
eb2b4f91 309
310 // Propagate to the entrance in the TRD mother volume
41702fec 311 new(&track) AliTRDtrackV1(*seed);
eb2b4f91 312 if(AliTRDgeometry::GetXtrdBeg() > (fgkMaxStep + track.GetX()) && !PropagateToX(track, AliTRDgeometry::GetXtrdBeg(), fgkMaxStep)){
313 seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
314 continue;
315 }
316 if(!AdjustSector(&track)){
317 seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
318 continue;
319 }
320 if(TMath::Abs(track.GetSnp()) > fgkMaxSnp) {
321 seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
322 continue;
323 }
324
325 nTPCseeds++;
e4d4864b 326
eb2b4f91 327 // store track status at TRD entrance
76b60503 328 seed->UpdateTrackParams(&track, AliESDtrack::kTRDbackup);
ae3fbe1f 329
eb2b4f91 330 // prepare track and do propagation in the TRD
331 track.SetReconstructor(fReconstructor);
332 track.SetKink(Bool_t(seed->GetKinkIndex(0)));
333 expectedClr = FollowBackProlongation(track);
334 // check if track entered the TRD fiducial volume
335 if(track.GetTrackLow()){
336 seed->UpdateTrackParams(&track, AliESDtrack::kTRDin);
337 nTRDseeds++;
338 }
339 // check if track was stopped in the TRD
340 if (expectedClr<0){
341 seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
342 continue;
343 }
ae3fbe1f 344
345 if(expectedClr){
eb2b4f91 346 nFound++;
41702fec 347 // computes PID for track
348 track.CookPID();
349 // update calibration references using this track
350 if(calibra->GetHisto2d()) calibra->UpdateHistogramsV1(&track);
351 // save calibration object
eb2b4f91 352 if (fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 0){
224f357f 353 AliTRDtrackV1 *calibTrack = new AliTRDtrackV1(track);
354 calibTrack->SetOwner();
355 seed->AddCalibObject(calibTrack);
356 }
357 //update ESD track
41702fec 358 if ((track.GetNumberOfClusters() > 15) && (track.GetNumberOfClusters() > 0.5*expectedClr)) {
2389e96f 359 seed->UpdateTrackParams(&track, AliESDtrack::kTRDout);
41702fec 360 track.UpdateESDtrack(seed);
41702fec 361 }
362 }
363
27fbeba8 364 if ((TMath::Abs(track.GetC(track.GetBz()) - p4) / TMath::Abs(p4) < 0.2) ||(track.Pt() > 0.8)) {
e3cf3d02 365
41702fec 366 // Make backup for back propagation
41702fec 367 Int_t foundClr = track.GetNumberOfClusters();
368 if (foundClr >= foundMin) {
41702fec 369 track.CookLabel(1. - fgkLabelFraction);
f29f13a6 370 //if(track.GetBackupTrack()) UseClusters(track.GetBackupTrack());
41702fec 371
372 // Sign only gold tracks
373 if (track.GetChi2() / track.GetNumberOfClusters() < 4) {
f29f13a6 374 //if ((seed->GetKinkIndex(0) == 0) && (track.Pt() < 1.5)) UseClusters(&track);
41702fec 375 }
376 Bool_t isGold = kFALSE;
377
378 // Full gold track
379 if (track.GetChi2() / track.GetNumberOfClusters() < 5) {
380 if (track.GetBackupTrack()) seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup);
381
382 isGold = kTRUE;
383 }
384
385 // Almost gold track
386 if ((!isGold) && (track.GetNCross() == 0) && (track.GetChi2() / track.GetNumberOfClusters() < 7)) {
387 //seed->UpdateTrackParams(track, AliESDtrack::kTRDbackup);
388 if (track.GetBackupTrack()) seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup);
389
390 isGold = kTRUE;
391 }
392
393 if ((!isGold) && (track.GetBackupTrack())) {
394 if ((track.GetBackupTrack()->GetNumberOfClusters() > foundMin) && ((track.GetBackupTrack()->GetChi2()/(track.GetBackupTrack()->GetNumberOfClusters()+1)) < 7)) {
395 seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup);
396 isGold = kTRUE;
397 }
398 }
41702fec 399 }
400 }
401
eb2b4f91 402 // Propagation to the TOF
403 if(!(seed->GetStatus()&AliESDtrack::kTRDStop)) {
404 Int_t sm = track.GetSector();
405 // default value in case we have problems with the geometry.
406 Double_t xtof = 371.;
407 //Calculate radial position of the beginning of the TOF
408 //mother volume. In order to avoid mixing of the TRD
409 //and TOF modules some hard values are needed. This are:
410 //1. The path to the TOF module.
411 //2. The width of the TOF (29.05 cm)
412 //(with the help of Annalisa de Caro Mar-17-2009)
413 if(gGeoManager){
414 gGeoManager->cd(Form("/ALIC_1/B077_1/BSEGMO%d_1/BTOF%d_1", sm, sm));
415 TGeoHMatrix *m = 0x0;
416 Double_t loc[]={0., 0., -.5*29.05}, glob[3];
417
418 if((m=gGeoManager->GetCurrentMatrix())){
419 m->LocalToMaster(loc, glob);
420 xtof = TMath::Sqrt(glob[0]*glob[0]+glob[1]*glob[1]);
421 }
41702fec 422 }
672b48bd 423 if(xtof > (fgkMaxStep + track.GetX()) && !PropagateToX(track, xtof, fgkMaxStep)){
424 seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
425 continue;
426 }
427 if(!AdjustSector(&track)){
428 seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
429 continue;
430 }
431 if(TMath::Abs(track.GetSnp()) > fgkMaxSnp){
432 seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
433 continue;
434 }
eb2b4f91 435 seed->UpdateTrackParams(&track, AliESDtrack::kTRDout);
436 // TODO obsolete - delete
437 seed->SetTRDQuality(track.StatusForTOF());
41702fec 438 }
41702fec 439 seed->SetTRDBudget(track.GetBudget(0));
440 }
d611c74f 441 if(index) delete [] index;
442 if(quality) delete [] quality;
41702fec 443
444
eb2b4f91 445 AliInfo(Form("Number of TPC seeds: %d (%d)", nTRDseeds, nTPCseeds));
446 AliInfo(Form("Number of propagated TRD tracks: %d", nFound));
41702fec 447
d611c74f 448 // run stand alone tracking
3a039a31 449 if (fReconstructor->IsSeeding()) Clusters2Tracks(event);
41702fec 450
451 return 0;
0906e73e 452}
453
454
455//____________________________________________________________________
456Int_t AliTRDtrackerV1::RefitInward(AliESDEvent *event)
457{
41702fec 458 //
459 // Refits tracks within the TRD. The ESD event is expected to contain seeds
460 // at the outer part of the TRD.
461 // The tracks are propagated to the innermost time bin
462 // of the TRD and the ESD event is updated
463 // Origin: Thomas KUHR (Thomas.Kuhr@cern.ch)
464 //
465
466 Int_t nseed = 0; // contor for loaded seeds
467 Int_t found = 0; // contor for updated TRD tracks
468
469
470 AliTRDtrackV1 track;
471 for (Int_t itrack = 0; itrack < event->GetNumberOfTracks(); itrack++) {
472 AliESDtrack *seed = event->GetTrack(itrack);
473 new(&track) AliTRDtrackV1(*seed);
474
475 if (track.GetX() < 270.0) {
476 seed->UpdateTrackParams(&track, AliESDtrack::kTRDbackup);
477 continue;
478 }
479
e3cf3d02 480 // reject tracks which failed propagation in the TRD or
481 // are produced by the TRD stand alone tracker
41702fec 482 ULong_t status = seed->GetStatus();
e3cf3d02 483 if(!(status & AliESDtrack::kTRDout)) continue;
484 if(!(status & AliESDtrack::kTRDin)) continue;
41702fec 485 nseed++;
486
487 track.ResetCovariance(50.0);
488
489 // do the propagation and processing
490 Bool_t kUPDATE = kFALSE;
491 Double_t xTPC = 250.0;
492 if(FollowProlongation(track)){
493 // Prolongate to TPC
494 if (PropagateToX(track, xTPC, fgkMaxStep)) { // -with update
e3cf3d02 495 seed->UpdateTrackParams(&track, AliESDtrack::kTRDrefit);
496 found++;
497 kUPDATE = kTRUE;
498 }
499
500 // Update the friend track
501 if (fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 0){
502 TObject *o = 0x0; Int_t ic = 0;
503 AliTRDtrackV1 *calibTrack = 0x0;
504 while((o = seed->GetCalibObject(ic++))){
505 if(!(calibTrack = dynamic_cast<AliTRDtrackV1*>(o))) continue;
506 calibTrack->SetTrackHigh(track.GetTrackHigh());
507 }
41702fec 508 }
e3cf3d02 509 }
41702fec 510
511 // Prolongate to TPC without update
512 if(!kUPDATE) {
513 AliTRDtrackV1 tt(*seed);
e3cf3d02 514 if (PropagateToX(tt, xTPC, fgkMaxStep)) seed->UpdateTrackParams(&tt, AliESDtrack::kTRDbackup);
41702fec 515 }
516 }
517 AliInfo(Form("Number of loaded seeds: %d",nseed));
518 AliInfo(Form("Number of found tracks from loaded seeds: %d",found));
519
520 return 0;
0906e73e 521}
522
0906e73e 523//____________________________________________________________________
524Int_t AliTRDtrackerV1::FollowProlongation(AliTRDtrackV1 &t)
525{
41702fec 526 // Extrapolates the TRD track in the TPC direction.
527 //
528 // Parameters
529 // t : the TRD track which has to be extrapolated
530 //
531 // Output
532 // number of clusters attached to the track
533 //
534 // Detailed description
535 //
536 // Starting from current radial position of track <t> this function
537 // extrapolates the track through the 6 TRD layers. The following steps
538 // are being performed for each plane:
539 // 1. prepare track:
540 // a. get plane limits in the local x direction
541 // b. check crossing sectors
542 // c. check track inclination
543 // 2. search tracklet in the tracker list (see GetTracklet() for details)
544 // 3. evaluate material budget using the geo manager
545 // 4. propagate and update track using the tracklet information.
546 //
547 // Debug level 2
548 //
549
e3cf3d02 550 Bool_t kStoreIn = kTRUE;
41702fec 551 Int_t nClustersExpected = 0;
e3cf3d02 552 for (Int_t iplane = kNPlanes; iplane--;) {
41702fec 553 Int_t index = 0;
554 AliTRDseedV1 *tracklet = GetTracklet(&t, iplane, index);
555 if(!tracklet) continue;
556 if(!tracklet->IsOK()) AliWarning("tracklet not OK");
557
e3cf3d02 558 Double_t x = tracklet->GetX();//GetX0();
41702fec 559 // reject tracklets which are not considered for inward refit
560 if(x > t.GetX()+fgkMaxStep) continue;
561
562 // append tracklet to track
563 t.SetTracklet(tracklet, index);
564
565 if (x < (t.GetX()-fgkMaxStep) && !PropagateToX(t, x+fgkMaxStep, fgkMaxStep)) break;
566 if (!AdjustSector(&t)) break;
567
568 // Start global position
569 Double_t xyz0[3];
570 t.GetXYZ(xyz0);
571
572 // End global position
573 Double_t alpha = t.GetAlpha(), y, z;
574 if (!t.GetProlongation(x,y,z)) break;
575 Double_t xyz1[3];
576 xyz1[0] = x * TMath::Cos(alpha) - y * TMath::Sin(alpha);
577 xyz1[1] = x * TMath::Sin(alpha) + y * TMath::Cos(alpha);
578 xyz1[2] = z;
579
51a23065 580 Double_t length = TMath::Sqrt(
581 (xyz0[0]-xyz1[0])*(xyz0[0]-xyz1[0]) +
582 (xyz0[1]-xyz1[1])*(xyz0[1]-xyz1[1]) +
583 (xyz0[2]-xyz1[2])*(xyz0[2]-xyz1[2])
584 );
585 if(length>0.){
586 // Get material budget
587 Double_t param[7];
588 if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param)<=0.) break;
589 Double_t xrho= param[0]*param[4];
590 Double_t xx0 = param[1]; // Get mean propagation parameters
591
592 // Propagate and update
593 t.PropagateTo(x, xx0, xrho);
594 if (!AdjustSector(&t)) break;
595 }
e3cf3d02 596 if(kStoreIn){
597 t.SetTrackHigh();
598 kStoreIn = kFALSE;
599 }
600
b72f4eaf 601 Double_t cov[3]; tracklet->GetCovAt(x, cov);
602 Double_t p[2] = { tracklet->GetY(), tracklet->GetZ()};
603 Double_t chi2 = ((AliExternalTrackParam)t).GetPredictedChi2(p, cov);
604 if (chi2 < 1e+10 && t.Update(p, cov, chi2)){
41702fec 605 nClustersExpected += tracklet->GetN();
606 }
607 }
608
3a039a31 609 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){
41702fec 610 Int_t index;
51a23065 611 for(int iplane=0; iplane<AliTRDgeometry::kNlayer; iplane++){
41702fec 612 AliTRDseedV1 *tracklet = GetTracklet(&t, iplane, index);
613 if(!tracklet) continue;
614 t.SetTracklet(tracklet, index);
615 }
616
617 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
29f95561 618 TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
eb2b4f91 619 AliTRDtrackV1 track(t);
620 track.SetOwner();
41702fec 621 cstreamer << "FollowProlongation"
622 << "EventNumber=" << eventNumber
623 << "ncl=" << nClustersExpected
eb2b4f91 624 << "track.=" << &track
41702fec 625 << "\n";
626 }
627
628 return nClustersExpected;
0906e73e 629
630}
631
632//_____________________________________________________________________________
633Int_t AliTRDtrackerV1::FollowBackProlongation(AliTRDtrackV1 &t)
634{
41702fec 635 // Extrapolates the TRD track in the TOF direction.
636 //
637 // Parameters
638 // t : the TRD track which has to be extrapolated
639 //
640 // Output
641 // number of clusters attached to the track
642 //
643 // Detailed description
644 //
645 // Starting from current radial position of track <t> this function
646 // extrapolates the track through the 6 TRD layers. The following steps
647 // are being performed for each plane:
648 // 1. prepare track:
649 // a. get plane limits in the local x direction
650 // b. check crossing sectors
651 // c. check track inclination
652 // 2. build tracklet (see AliTRDseed::AttachClusters() for details)
653 // 3. evaluate material budget using the geo manager
654 // 4. propagate and update track using the tracklet information.
655 //
656 // Debug level 2
657 //
658
eb2b4f91 659 Int_t n = 0;
660 Double_t driftLength = .5*AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick();
41702fec 661 AliTRDtrackingChamber *chamber = 0x0;
662
3b57a3f7 663 AliTRDseedV1 tracklet, *ptrTracklet = 0x0;
181d2c97 664 // in case of stand alone tracking we store all the pointers to the tracklets in a temporary array
665 AliTRDseedV1 *tracklets[kNPlanes];
666 memset(tracklets, 0, sizeof(AliTRDseedV1 *) * kNPlanes);
667 for(Int_t ip = 0; ip < kNPlanes; ip++){
668 tracklets[ip] = t.GetTracklet(ip);
669 t.UnsetTracklet(ip);
670 }
81a6494d 671 Bool_t kStoreIn = kTRUE, kPropagateIn = kTRUE;
e3cf3d02 672
053767a4 673 // Loop through the TRD layers
eb2b4f91 674 TGeoHMatrix *matrix = 0x0;
675 Double_t x, y, z;
676 for (Int_t ily=0, sm=-1, stk=-1, det=-1; ily < AliTRDgeometry::kNlayer; ily++) {
677 // rough estimate of the entry point
678 if (!t.GetProlongation(fR[ily], y, z)){
679 n=-1;
680 t.SetStatus(AliTRDtrackV1::kProlongation);
681 break;
682 }
41702fec 683
eb2b4f91 684 // find sector / stack / detector
685 sm = t.GetSector();
686 // TODO cross check with y value !
687 stk = fGeom->GetStack(z, ily);
688 det = stk>=0 ? AliTRDgeometry::GetDetector(ily, stk, sm) : -1;
689 matrix = det>=0 ? fGeom->GetClusterMatrix(det) : 0x0;
690
691 // check if supermodule/chamber is installed
692 if( !fGeom->GetSMstatus(sm) ||
693 stk<0. ||
694 fGeom->IsHole(ily, stk, sm) ||
695 !matrix ){
696 // propagate to the default radial position
697 if(fR[ily] > (fgkMaxStep + t.GetX()) && !PropagateToX(t, fR[ily], fgkMaxStep)){
698 n=-1;
699 t.SetStatus(AliTRDtrackV1::kPropagation);
41702fec 700 break;
701 }
eb2b4f91 702 if(!AdjustSector(&t)){
703 n=-1;
704 t.SetStatus(AliTRDtrackV1::kAdjustSector);
705 break;
706 }
707 if(TMath::Abs(t.GetSnp()) > fgkMaxSnp){
708 n=-1;
709 t.SetStatus(AliTRDtrackV1::kSnp);
710 break;
711 }
712 t.SetStatus(AliTRDtrackV1::kGeometry, ily);
41702fec 713 continue;
714 }
e3cf3d02 715
eb2b4f91 716 // retrieve rotation matrix for the current chamber
717 Double_t loc[] = {AliTRDgeometry::AnodePos()- driftLength, 0., 0.};
718 Double_t glb[] = {0., 0., 0.};
719 matrix->LocalToMaster(loc, glb);
720
721 // Propagate to the radial distance of the current layer
722 x = glb[0] - fgkMaxStep;
723 if(x > (fgkMaxStep + t.GetX()) && !PropagateToX(t, x, fgkMaxStep)){
724 n=-1;
725 t.SetStatus(AliTRDtrackV1::kPropagation);
726 break;
727 }
728 if(!AdjustSector(&t)){
729 n=-1;
730 t.SetStatus(AliTRDtrackV1::kAdjustSector);
731 break;
732 }
733 if(TMath::Abs(t.GetSnp()) > fgkMaxSnp) {
734 n=-1;
735 t.SetStatus(AliTRDtrackV1::kSnp);
736 break;
737 }
738 Bool_t RECALCULATE = kFALSE;
739 if(sm != t.GetSector()){
740 sm = t.GetSector();
741 RECALCULATE = kTRUE;
742 }
743 if(stk != fGeom->GetStack(z, ily)){
744 stk = fGeom->GetStack(z, ily);
745 RECALCULATE = kTRUE;
746 }
747 if(RECALCULATE){
748 det = AliTRDgeometry::GetDetector(ily, stk, sm);
749 if(!(matrix = fGeom->GetClusterMatrix(det))){
750 t.SetStatus(AliTRDtrackV1::kGeometry, ily);
751 continue;
752 }
753 matrix->LocalToMaster(loc, glb);
754 x = glb[0] - fgkMaxStep;
755 }
756
757 // check if track is well inside fiducial volume
758 if (!t.GetProlongation(x+fgkMaxStep, y, z)) {
759 n=-1;
760 t.SetStatus(AliTRDtrackV1::kProlongation);
761 break;
762 }
763 if(fGeom->IsOnBoundary(det, y, z, .5)){
764 t.SetStatus(AliTRDtrackV1::kBoundary, ily);
765 continue;
766 }
767 // mark track as entering the FIDUCIAL volume of TRD
e3cf3d02 768 if(kStoreIn){
769 t.SetTrackLow();
770 kStoreIn = kFALSE;
771 }
b1957d3c 772
eb2b4f91 773 ptrTracklet = tracklets[ily];
774 if(!ptrTracklet){ // BUILD TRACKLET
775 // check data in supermodule
776 if(!fTrSec[sm].GetNChambers()){
777 t.SetStatus(AliTRDtrackV1::kNoClusters, ily);
778 continue;
779 }
780 if(fTrSec[sm].GetX(ily) < 1.){
781 t.SetStatus(AliTRDtrackV1::kNoClusters, ily);
782 continue;
783 }
784
785 // check data in chamber
786 if(!(chamber = fTrSec[sm].GetChamber(stk, ily))){
787 t.SetStatus(AliTRDtrackV1::kNoClusters, ily);
788 continue;
789 }
790 if(chamber->GetNClusters() < fgNTimeBins*fReconstructor->GetRecoParam() ->GetFindableClusters()){
791 t.SetStatus(AliTRDtrackV1::kNoClusters, ily);
792 continue;
793 }
794 // build tracklet
795 ptrTracklet = new(&tracklet) AliTRDseedV1(det);
796 ptrTracklet->SetReconstructor(fReconstructor);
797 ptrTracklet->SetKink(t.IsKink());
798 ptrTracklet->SetPadPlane(fGeom->GetPadPlane(ily, stk));
799 ptrTracklet->SetX0(glb[0]+driftLength);
800 if(!tracklet.Init(&t)){
801 n=-1;
802 t.SetStatus(AliTRDtrackV1::kTrackletInit);
803 break;
804 }
805 if(!tracklet.AttachClusters(chamber, kTRUE)){
806 t.SetStatus(AliTRDtrackV1::kNoAttach, ily);
807 continue;
808 }
809 if(tracklet.GetN() < fgNTimeBins*fReconstructor->GetRecoParam() ->GetFindableClusters()){
810 t.SetStatus(AliTRDtrackV1::kNoClustersTracklet, ily);
811 continue;
812 }
813 ptrTracklet->UpdateUsed();
814 }
815
816 // propagate track to the radial position of the tracklet
817 ptrTracklet->UseClusters(); // TODO ? do we need this here ?
818 // fit tracklet no tilt correction
819 if(!ptrTracklet->Fit(kFALSE)){
820 t.SetStatus(AliTRDtrackV1::kNoFit, ily);
821 continue;
822 }
823 x = ptrTracklet->GetX(); //GetX0();
824 if(x > (fgkMaxStep + t.GetX()) && !PropagateToX(t, x, fgkMaxStep)) {
825 n=-1;
826 t.SetStatus(AliTRDtrackV1::kPropagation);
827 break;
828 }
829 if(!AdjustSector(&t)) {
830 n=-1;
831 t.SetStatus(AliTRDtrackV1::kAdjustSector);
832 break;
41702fec 833 }
eb2b4f91 834 if(TMath::Abs(t.GetSnp()) > fgkMaxSnp) {
835 n=-1;
836 t.SetStatus(AliTRDtrackV1::kSnp);
837 break;
838 }
839
81a6494d 840 if(kPropagateIn){
841 t.SetTrackLow();
842 kPropagateIn = kFALSE;
843 }
844
eb2b4f91 845 // update Kalman with the TRD measurement
b72f4eaf 846 Double_t cov[3]; ptrTracklet->GetCovAt(x, cov);
847 Double_t p[2] = { ptrTracklet->GetY(), ptrTracklet->GetZ()};
848 Double_t chi2 = ((AliExternalTrackParam)t).GetPredictedChi2(p, cov);
849 if(chi2>1e+10){ // TODO
eb2b4f91 850 t.SetStatus(AliTRDtrackV1::kChi2, ily);
851 continue;
852 }
b72f4eaf 853 if(!t.Update(p, cov, chi2)) {
eb2b4f91 854 n=-1;
855 t.SetStatus(AliTRDtrackV1::kUpdate);
856 break;
857 }
b72f4eaf 858 // fill residuals ?!
859 AliTracker::FillResiduals(&t, p, cov, ptrTracklet->GetVolumeId());
860
eb2b4f91 861
862 // load tracklet to the tracker
863 ptrTracklet->UpDate(&t);
864 ptrTracklet = SetTracklet(ptrTracklet);
865 t.SetTracklet(ptrTracklet, fTracklets->GetEntriesFast()-1);
866 n += ptrTracklet->GetN();
867
41702fec 868 // Reset material budget if 2 consecutive gold
eb2b4f91 869// if(ilayer>0 && t.GetTracklet(ilayer-1) && ptrTracklet->GetN() + t.GetTracklet(ilayer-1)->GetN() > 20) t.SetBudget(2, 0.);
41702fec 870
871 // Make backup of the track until is gold
872 // TO DO update quality check of the track.
873 // consider comparison with fTimeBinsRange
874 Float_t ratio0 = ptrTracklet->GetN() / Float_t(fgNTimeBins);
875 //Float_t ratio1 = Float_t(t.GetNumberOfClusters()+1) / Float_t(t.GetNExpected()+1);
41702fec 876
eb2b4f91 877 if( (chi2 < 18.0) &&
41702fec 878 (ratio0 > 0.8) &&
879 //(ratio1 > 0.6) &&
880 //(ratio0+ratio1 > 1.5) &&
881 (t.GetNCross() == 0) &&
882 (TMath::Abs(t.GetSnp()) < 0.85) &&
e3cf3d02 883 (t.GetNumberOfClusters() > 20)){
884 t.MakeBackupTrack();
885 }
053767a4 886 } // end layers loop
eb2b4f91 887 //printf("clusters[%d] chi2[%f] x[%f] status[%d ", n, t.GetChi2(), t.GetX(), t.GetStatusTRD());
888 //for(int i=0; i<6; i++) printf("%d ", t.GetStatusTRD(i)); printf("]\n");
41702fec 889
3a039a31 890 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){
29f95561 891 TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
41702fec 892 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
eb2b4f91 893 AliTRDtrackV1 track(t);
894 track.SetOwner();
41702fec 895 cstreamer << "FollowBackProlongation"
eb2b4f91 896 << "EventNumber=" << eventNumber
897 << "ncl=" << n
898 << "track.=" << &track
41702fec 899 << "\n";
900 }
901
eb2b4f91 902 return n;
0906e73e 903}
904
eb38ed55 905//_________________________________________________________________________
906Float_t AliTRDtrackerV1::FitRieman(AliTRDseedV1 *tracklets, Double_t *chi2, Int_t *planes){
41702fec 907 //
908 // Fits a Riemann-circle to the given points without tilting pad correction.
909 // The fit is performed using an instance of the class AliRieman (equations
910 // and transformations see documentation of this class)
911 // Afterwards all the tracklets are Updated
912 //
913 // Parameters: - Array of tracklets (AliTRDseedV1)
914 // - Storage for the chi2 values (beginning with direction z)
915 // - Seeding configuration
916 // Output: - The curvature
917 //
918 AliRieman *fitter = AliTRDtrackerV1::GetRiemanFitter();
919 fitter->Reset();
920 Int_t allplanes[] = {0, 1, 2, 3, 4, 5};
921 Int_t *ppl = &allplanes[0];
922 Int_t maxLayers = 6;
923 if(planes){
924 maxLayers = 4;
925 ppl = planes;
926 }
927 for(Int_t il = 0; il < maxLayers; il++){
928 if(!tracklets[ppl[il]].IsOK()) continue;
e3cf3d02 929 fitter->AddPoint(tracklets[ppl[il]].GetX0(), tracklets[ppl[il]].GetYfit(0), tracklets[ppl[il]].GetZfit(0),1,10);
41702fec 930 }
931 fitter->Update();
932 // Set the reference position of the fit and calculate the chi2 values
933 memset(chi2, 0, sizeof(Double_t) * 2);
934 for(Int_t il = 0; il < maxLayers; il++){
935 // Reference positions
936 tracklets[ppl[il]].Init(fitter);
937
938 // chi2
939 if((!tracklets[ppl[il]].IsOK()) && (!planes)) continue;
940 chi2[0] += tracklets[ppl[il]].GetChi2Y();
941 chi2[1] += tracklets[ppl[il]].GetChi2Z();
942 }
943 return fitter->GetC();
eb38ed55 944}
945
946//_________________________________________________________________________
947void AliTRDtrackerV1::FitRieman(AliTRDcluster **seedcl, Double_t chi2[2])
948{
41702fec 949 //
950 // Performs a Riemann helix fit using the seedclusters as spacepoints
951 // Afterwards the chi2 values are calculated and the seeds are updated
952 //
953 // Parameters: - The four seedclusters
954 // - The tracklet array (AliTRDseedV1)
955 // - The seeding configuration
956 // - Chi2 array
957 //
958 // debug level 2
959 //
960 AliRieman *fitter = AliTRDtrackerV1::GetRiemanFitter();
961 fitter->Reset();
a3743898 962 for(Int_t i = 0; i < 4; i++){
a3743898 963 fitter->AddPoint(seedcl[i]->GetX(), seedcl[i]->GetY(), seedcl[i]->GetZ(), 1., 10.);
964 }
41702fec 965 fitter->Update();
966
967
968 // Update the seed and calculated the chi2 value
969 chi2[0] = 0; chi2[1] = 0;
970 for(Int_t ipl = 0; ipl < kNSeedPlanes; ipl++){
971 // chi2
972 chi2[0] += (seedcl[ipl]->GetZ() - fitter->GetZat(seedcl[ipl]->GetX())) * (seedcl[ipl]->GetZ() - fitter->GetZat(seedcl[ipl]->GetX()));
973 chi2[1] += (seedcl[ipl]->GetY() - fitter->GetYat(seedcl[ipl]->GetX())) * (seedcl[ipl]->GetY() - fitter->GetYat(seedcl[ipl]->GetX()));
974 }
eb38ed55 975}
976
977
978//_________________________________________________________________________
979Float_t AliTRDtrackerV1::FitTiltedRiemanConstraint(AliTRDseedV1 *tracklets, Double_t zVertex)
980{
41702fec 981 //
982 // Fits a helix to the clusters. Pad tilting is considered. As constraint it is
983 // assumed that the vertex position is set to 0.
984 // This method is very usefull for high-pt particles
985 // Basis for the fit: (x - x0)^2 + (y - y0)^2 - R^2 = 0
986 // x0, y0: Center of the circle
987 // Measured y-position: ymeas = y - tan(phiT)(zc - zt)
988 // zc: center of the pad row
989 // Equation which has to be fitted (after transformation):
990 // a + b * u + e * v + 2*(ymeas + tan(phiT)(z - zVertex))*t = 0
991 // Transformation:
992 // t = 1/(x^2 + y^2)
993 // u = 2 * x * t
994 // v = 2 * x * tan(phiT) * t
995 // Parameters in the equation:
996 // a = -1/y0, b = x0/y0, e = dz/dx
997 //
998 // The Curvature is calculated by the following equation:
999 // - curv = a/Sqrt(b^2 + 1) = 1/R
1000 // Parameters: - the 6 tracklets
1001 // - the Vertex constraint
1002 // Output: - the Chi2 value of the track
1003 //
1004 // debug level 5
1005 //
1006
1007 TLinearFitter *fitter = GetTiltedRiemanFitterConstraint();
1008 fitter->StoreData(kTRUE);
1009 fitter->ClearPoints();
1010 AliTRDcluster *cl = 0x0;
1011
1012 Float_t x, y, z, w, t, error, tilt;
1013 Double_t uvt[2];
1014 Int_t nPoints = 0;
053767a4 1015 for(Int_t ilr = 0; ilr < AliTRDgeometry::kNlayer; ilr++){
1016 if(!tracklets[ilr].IsOK()) continue;
8d2bec9e 1017 for(Int_t itb = 0; itb < AliTRDseedV1::kNclusters; itb++){
053767a4 1018 if(!tracklets[ilr].IsUsable(itb)) continue;
1019 cl = tracklets[ilr].GetClusters(itb);
41702fec 1020 x = cl->GetX();
1021 y = cl->GetY();
1022 z = cl->GetZ();
053767a4 1023 tilt = tracklets[ilr].GetTilt();
41702fec 1024 // Transformation
1025 t = 1./(x * x + y * y);
1026 uvt[0] = 2. * x * t;
1027 uvt[1] = 2. * x * t * tilt ;
1028 w = 2. * (y + tilt * (z - zVertex)) * t;
f29f13a6 1029 error = 2. * TMath::Sqrt(cl->GetSigmaY2()) * t;
41702fec 1030 fitter->AddPoint(uvt, w, error);
1031 nPoints++;
1032 }
1033 }
1034 fitter->Eval();
1035
1036 // Calculate curvature
1037 Double_t a = fitter->GetParameter(0);
1038 Double_t b = fitter->GetParameter(1);
1039 Double_t curvature = a/TMath::Sqrt(b*b + 1);
1040
1041 Float_t chi2track = fitter->GetChisquare()/Double_t(nPoints);
1042 for(Int_t ip = 0; ip < AliTRDtrackerV1::kNPlanes; ip++)
e3cf3d02 1043 tracklets[ip].SetC(curvature);
41702fec 1044
3a039a31 1045/* if(fReconstructor->GetStreamLevel() >= 5){
41702fec 1046 //Linear Model on z-direction
1047 Double_t xref = CalculateReferenceX(tracklets); // Relative to the middle of the stack
1048 Double_t slope = fitter->GetParameter(2);
1049 Double_t zref = slope * xref;
1050 Float_t chi2Z = CalculateChi2Z(tracklets, zref, slope, xref);
1051 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
1052 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
29f95561 1053 TTreeSRedirector &treeStreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
41702fec 1054 treeStreamer << "FitTiltedRiemanConstraint"
1055 << "EventNumber=" << eventNumber
1056 << "CandidateNumber=" << candidateNumber
1057 << "Curvature=" << curvature
1058 << "Chi2Track=" << chi2track
1059 << "Chi2Z=" << chi2Z
1060 << "zref=" << zref
1061 << "\n";
3a039a31 1062 }*/
41702fec 1063 return chi2track;
eb38ed55 1064}
1065
1066//_________________________________________________________________________
1067Float_t AliTRDtrackerV1::FitTiltedRieman(AliTRDseedV1 *tracklets, Bool_t sigError)
1068{
41702fec 1069 //
1070 // Performs a Riemann fit taking tilting pad correction into account
1071 // The equation of a Riemann circle, where the y position is substituted by the
1072 // measured y-position taking pad tilting into account, has to be transformed
1073 // into a 4-dimensional hyperplane equation
1074 // Riemann circle: (x-x0)^2 + (y-y0)^2 -R^2 = 0
1075 // Measured y-Position: ymeas = y - tan(phiT)(zc - zt)
1076 // zc: center of the pad row
1077 // zt: z-position of the track
1078 // The z-position of the track is assumed to be linear dependent on the x-position
1079 // Transformed equation: a + b * u + c * t + d * v + e * w - 2 * (ymeas + tan(phiT) * zc) * t = 0
1080 // Transformation: u = 2 * x * t
1081 // v = 2 * tan(phiT) * t
1082 // w = 2 * tan(phiT) * (x - xref) * t
1083 // t = 1 / (x^2 + ymeas^2)
1084 // Parameters: a = -1/y0
1085 // b = x0/y0
1086 // c = (R^2 -x0^2 - y0^2)/y0
1087 // d = offset
1088 // e = dz/dx
1089 // If the offset respectively the slope in z-position is impossible, the parameters are fixed using
1090 // results from the simple riemann fit. Afterwards the fit is redone.
1091 // The curvature is calculated according to the formula:
1092 // curv = a/(1 + b^2 + c*a) = 1/R
1093 //
1094 // Paramters: - Array of tracklets (connected to the track candidate)
1095 // - Flag selecting the error definition
1096 // Output: - Chi2 values of the track (in Parameter list)
1097 //
1098 TLinearFitter *fitter = GetTiltedRiemanFitter();
1099 fitter->StoreData(kTRUE);
1100 fitter->ClearPoints();
1101 AliTRDLeastSquare zfitter;
1102 AliTRDcluster *cl = 0x0;
1103
1104 Double_t xref = CalculateReferenceX(tracklets);
1105 Double_t x, y, z, t, tilt, dx, w, we;
1106 Double_t uvt[4];
1107 Int_t nPoints = 0;
1108 // Containers for Least-square fitter
1109 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1110 if(!tracklets[ipl].IsOK()) continue;
ed15ef4f 1111 tilt = tracklets[ipl].GetTilt();
8d2bec9e 1112 for(Int_t itb = 0; itb < AliTRDseedV1::kNclusters; itb++){
41702fec 1113 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1114 if (!tracklets[ipl].IsUsable(itb)) continue;
1115 x = cl->GetX();
1116 y = cl->GetY();
1117 z = cl->GetZ();
41702fec 1118 dx = x - xref;
1119 // Transformation
1120 t = 1./(x*x + y*y);
1121 uvt[0] = 2. * x * t;
1122 uvt[1] = t;
1123 uvt[2] = 2. * tilt * t;
1124 uvt[3] = 2. * tilt * dx * t;
1125 w = 2. * (y + tilt*z) * t;
1126 // error definition changes for the different calls
1127 we = 2. * t;
f29f13a6 1128 we *= sigError ? TMath::Sqrt(cl->GetSigmaY2()) : 0.2;
41702fec 1129 fitter->AddPoint(uvt, w, we);
1130 zfitter.AddPoint(&x, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
1131 nPoints++;
1132 }
1133 }
1134 fitter->Eval();
1135 zfitter.Eval();
1136
1137 Double_t offset = fitter->GetParameter(3);
1138 Double_t slope = fitter->GetParameter(4);
1139
1140 // Linear fitter - not possible to make boundaries
1141 // Do not accept non possible z and dzdx combinations
1142 Bool_t acceptablez = kTRUE;
1143 Double_t zref = 0.0;
1144 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
1145 if(!tracklets[iLayer].IsOK()) continue;
1146 zref = offset + slope * (tracklets[iLayer].GetX0() - xref);
e3cf3d02 1147 if (TMath::Abs(tracklets[iLayer].GetZfit(0) - zref) > tracklets[iLayer].GetPadLength() * 0.5 + 1.0)
41702fec 1148 acceptablez = kFALSE;
1149 }
1150 if (!acceptablez) {
1151 Double_t dzmf = zfitter.GetFunctionParameter(1);
1152 Double_t zmf = zfitter.GetFunctionValue(&xref);
1153 fgTiltedRieman->FixParameter(3, zmf);
1154 fgTiltedRieman->FixParameter(4, dzmf);
1155 fitter->Eval();
1156 fitter->ReleaseParameter(3);
1157 fitter->ReleaseParameter(4);
1158 offset = fitter->GetParameter(3);
1159 slope = fitter->GetParameter(4);
1160 }
1161
1162 // Calculate Curvarture
1163 Double_t a = fitter->GetParameter(0);
1164 Double_t b = fitter->GetParameter(1);
1165 Double_t c = fitter->GetParameter(2);
1166 Double_t curvature = 1.0 + b*b - c*a;
1167 if (curvature > 0.0)
1168 curvature = a / TMath::Sqrt(curvature);
1169
1170 Double_t chi2track = fitter->GetChisquare()/Double_t(nPoints);
1171
1172 // Update the tracklets
1173 Double_t dy, dz;
1174 for(Int_t iLayer = 0; iLayer < AliTRDtrackerV1::kNPlanes; iLayer++) {
1175
1176 x = tracklets[iLayer].GetX0();
1177 y = 0;
1178 z = 0;
1179 dy = 0;
1180 dz = 0;
1181
1182 // y: R^2 = (x - x0)^2 + (y - y0)^2
1183 // => y = y0 +/- Sqrt(R^2 - (x - x0)^2)
1184 // R = Sqrt() = 1/Curvature
1185 // => y = y0 +/- Sqrt(1/Curvature^2 - (x - x0)^2)
1186 Double_t res = (x * a + b); // = (x - x0)/y0
1187 res *= res;
1188 res = 1.0 - c * a + b * b - res; // = (R^2 - (x - x0)^2)/y0^2
1189 if (res >= 0) {
1190 res = TMath::Sqrt(res);
1191 y = (1.0 - res) / a;
1192 }
1193
1194 // dy: R^2 = (x - x0)^2 + (y - y0)^2
1195 // => y = +/- Sqrt(R^2 - (x - x0)^2) + y0
1196 // => dy/dx = (x - x0)/Sqrt(R^2 - (x - x0)^2)
1197 // Curvature: cr = 1/R = a/Sqrt(1 + b^2 - c*a)
1198 // => dy/dx = (x - x0)/(1/(cr^2) - (x - x0)^2)
1199 Double_t x0 = -b / a;
1200 if (-c * a + b * b + 1 > 0) {
1201 if (1.0/(curvature * curvature) - (x - x0) * (x - x0) > 0.0) {
1202 Double_t yderiv = (x - x0) / TMath::Sqrt(1.0/(curvature * curvature) - (x - x0) * (x - x0));
1203 if (a < 0) yderiv *= -1.0;
1204 dy = yderiv;
1205 }
1206 }
1207 z = offset + slope * (x - xref);
1208 dz = slope;
1209 tracklets[iLayer].SetYref(0, y);
1210 tracklets[iLayer].SetYref(1, dy);
1211 tracklets[iLayer].SetZref(0, z);
1212 tracklets[iLayer].SetZref(1, dz);
1213 tracklets[iLayer].SetC(curvature);
1214 tracklets[iLayer].SetChi2(chi2track);
1215 }
1216
3a039a31 1217/* if(fReconstructor->GetStreamLevel() >=5){
29f95561 1218 TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
41702fec 1219 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
1220 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
1221 Double_t chi2z = CalculateChi2Z(tracklets, offset, slope, xref);
1222 cstreamer << "FitTiltedRieman0"
1223 << "EventNumber=" << eventNumber
1224 << "CandidateNumber=" << candidateNumber
1225 << "xref=" << xref
1226 << "Chi2Z=" << chi2z
1227 << "\n";
3a039a31 1228 }*/
41702fec 1229 return chi2track;
eb38ed55 1230}
1231
3b57a3f7 1232
9e333711 1233//____________________________________________________________________
6e4d4425 1234Double_t AliTRDtrackerV1::FitLine(const AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t err, Int_t np, AliTrackPoint *points)
9e333711 1235{
1236 AliTRDLeastSquare yfitter, zfitter;
1237 AliTRDcluster *cl = 0x0;
1238
1239 AliTRDseedV1 work[kNPlanes], *tracklet = 0x0;
1240 if(!tracklets){
1241 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1242 if(!(tracklet = track->GetTracklet(ipl))) continue;
1243 if(!tracklet->IsOK()) continue;
1244 new(&work[ipl]) AliTRDseedV1(*tracklet);
1245 }
1246 tracklets = &work[0];
1247 }
1248
1249 Double_t xref = CalculateReferenceX(tracklets);
1250 Double_t x, y, z, dx, ye, yr, tilt;
1251 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1252 if(!tracklets[ipl].IsOK()) continue;
1253 for(Int_t itb = 0; itb < fgNTimeBins; itb++){
1254 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1255 if (!tracklets[ipl].IsUsable(itb)) continue;
1256 x = cl->GetX();
1257 z = cl->GetZ();
1258 dx = x - xref;
1259 zfitter.AddPoint(&dx, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
1260 }
1261 }
1262 zfitter.Eval();
1263 Double_t z0 = zfitter.GetFunctionParameter(0);
1264 Double_t dzdx = zfitter.GetFunctionParameter(1);
1265 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1266 if(!tracklets[ipl].IsOK()) continue;
1267 for(Int_t itb = 0; itb < fgNTimeBins; itb++){
1268 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1269 if (!tracklets[ipl].IsUsable(itb)) continue;
1270 x = cl->GetX();
1271 y = cl->GetY();
1272 z = cl->GetZ();
1273 tilt = tracklets[ipl].GetTilt();
1274 dx = x - xref;
1275 yr = y + tilt*(z - z0 - dzdx*dx);
1276 // error definition changes for the different calls
1277 ye = tilt*TMath::Sqrt(cl->GetSigmaZ2());
1278 ye += err ? tracklets[ipl].GetSigmaY() : 0.2;
1279 yfitter.AddPoint(&dx, yr, ye);
1280 }
1281 }
1282 yfitter.Eval();
1283 Double_t y0 = yfitter.GetFunctionParameter(0);
1284 Double_t dydx = yfitter.GetFunctionParameter(1);
1285 Double_t chi2 = 0.;//yfitter.GetChisquare()/Double_t(nPoints);
1286
1287 //update track points array
1288 if(np && points){
1289 Float_t xyz[3];
1290 for(int ip=0; ip<np; ip++){
1291 points[ip].GetXYZ(xyz);
1292 xyz[1] = y0 + dydx * (xyz[0] - xref);
1293 xyz[2] = z0 + dzdx * (xyz[0] - xref);
1294 points[ip].SetXYZ(xyz);
1295 }
1296 }
1297 return chi2;
1298}
1299
1300
3b57a3f7 1301//_________________________________________________________________________
6e4d4425 1302Double_t AliTRDtrackerV1::FitRiemanTilt(const AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t sigError, Int_t np, AliTrackPoint *points)
3b57a3f7 1303{
41702fec 1304 //
1305 // Performs a Riemann fit taking tilting pad correction into account
1306 // The equation of a Riemann circle, where the y position is substituted by the
1307 // measured y-position taking pad tilting into account, has to be transformed
1308 // into a 4-dimensional hyperplane equation
1309 // Riemann circle: (x-x0)^2 + (y-y0)^2 -R^2 = 0
1310 // Measured y-Position: ymeas = y - tan(phiT)(zc - zt)
1311 // zc: center of the pad row
1312 // zt: z-position of the track
1313 // The z-position of the track is assumed to be linear dependent on the x-position
1314 // Transformed equation: a + b * u + c * t + d * v + e * w - 2 * (ymeas + tan(phiT) * zc) * t = 0
1315 // Transformation: u = 2 * x * t
1316 // v = 2 * tan(phiT) * t
1317 // w = 2 * tan(phiT) * (x - xref) * t
1318 // t = 1 / (x^2 + ymeas^2)
1319 // Parameters: a = -1/y0
1320 // b = x0/y0
1321 // c = (R^2 -x0^2 - y0^2)/y0
1322 // d = offset
1323 // e = dz/dx
1324 // If the offset respectively the slope in z-position is impossible, the parameters are fixed using
1325 // results from the simple riemann fit. Afterwards the fit is redone.
1326 // The curvature is calculated according to the formula:
1327 // curv = a/(1 + b^2 + c*a) = 1/R
1328 //
1329 // Paramters: - Array of tracklets (connected to the track candidate)
1330 // - Flag selecting the error definition
1331 // Output: - Chi2 values of the track (in Parameter list)
1332 //
1333 TLinearFitter *fitter = GetTiltedRiemanFitter();
1334 fitter->StoreData(kTRUE);
1335 fitter->ClearPoints();
1336 AliTRDLeastSquare zfitter;
1337 AliTRDcluster *cl = 0x0;
3b57a3f7 1338
1339 AliTRDseedV1 work[kNPlanes], *tracklet = 0x0;
1340 if(!tracklets){
1341 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1342 if(!(tracklet = track->GetTracklet(ipl))) continue;
1343 if(!tracklet->IsOK()) continue;
1344 new(&work[ipl]) AliTRDseedV1(*tracklet);
1345 }
1346 tracklets = &work[0];
1347 }
1348
41702fec 1349 Double_t xref = CalculateReferenceX(tracklets);
1350 Double_t x, y, z, t, tilt, dx, w, we;
1351 Double_t uvt[4];
1352 Int_t nPoints = 0;
1353 // Containers for Least-square fitter
1354 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1355 if(!tracklets[ipl].IsOK()) continue;
8d2bec9e 1356 for(Int_t itb = 0; itb < AliTRDseedV1::kNclusters; itb++){
41702fec 1357 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1358 if (!tracklets[ipl].IsUsable(itb)) continue;
1359 x = cl->GetX();
1360 y = cl->GetY();
1361 z = cl->GetZ();
1362 tilt = tracklets[ipl].GetTilt();
1363 dx = x - xref;
1364 // Transformation
1365 t = 1./(x*x + y*y);
1366 uvt[0] = 2. * x * t;
1367 uvt[1] = t;
1368 uvt[2] = 2. * tilt * t;
1369 uvt[3] = 2. * tilt * dx * t;
1370 w = 2. * (y + tilt*z) * t;
1371 // error definition changes for the different calls
1372 we = 2. * t;
f29f13a6 1373 we *= sigError ? TMath::Sqrt(cl->GetSigmaY2()) : 0.2;
41702fec 1374 fitter->AddPoint(uvt, w, we);
1375 zfitter.AddPoint(&x, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
1376 nPoints++;
1377 }
1378 }
aec26713 1379 if(fitter->Eval()) return 1.E10;
1380
41702fec 1381 Double_t z0 = fitter->GetParameter(3);
1382 Double_t dzdx = fitter->GetParameter(4);
3b57a3f7 1383
1384
1385 // Linear fitter - not possible to make boundaries
1386 // Do not accept non possible z and dzdx combinations
1387 Bool_t accept = kTRUE;
1388 Double_t zref = 0.0;
1389 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
1390 if(!tracklets[iLayer].IsOK()) continue;
1391 zref = z0 + dzdx * (tracklets[iLayer].GetX0() - xref);
e3cf3d02 1392 if (TMath::Abs(tracklets[iLayer].GetZfit(0) - zref) > tracklets[iLayer].GetPadLength() * 0.5 + 1.0)
3b57a3f7 1393 accept = kFALSE;
1394 }
1395 if (!accept) {
41702fec 1396 zfitter.Eval();
3b57a3f7 1397 Double_t dzmf = zfitter.GetFunctionParameter(1);
1398 Double_t zmf = zfitter.GetFunctionValue(&xref);
1399 fitter->FixParameter(3, zmf);
1400 fitter->FixParameter(4, dzmf);
1401 fitter->Eval();
1402 fitter->ReleaseParameter(3);
1403 fitter->ReleaseParameter(4);
1404 z0 = fitter->GetParameter(3); // = zmf ?
1405 dzdx = fitter->GetParameter(4); // = dzmf ?
1406 }
1407
1408 // Calculate Curvature
1409 Double_t a = fitter->GetParameter(0);
1410 Double_t b = fitter->GetParameter(1);
1411 Double_t c = fitter->GetParameter(2);
1412 Double_t y0 = 1. / a;
1413 Double_t x0 = -b * y0;
a015e406 1414 Double_t tmp = y0*y0 + x0*x0 - c*y0;
1415 if(tmp<=0.) return 1.E10;
1416 Double_t R = TMath::Sqrt(tmp);
3b57a3f7 1417 Double_t C = 1.0 + b*b - c*a;
1418 if (C > 0.0) C = a / TMath::Sqrt(C);
1419
1420 // Calculate chi2 of the fit
1421 Double_t chi2 = fitter->GetChisquare()/Double_t(nPoints);
1422
1423 // Update the tracklets
1424 if(!track){
1425 for(Int_t ip = 0; ip < kNPlanes; ip++) {
1426 x = tracklets[ip].GetX0();
90cf7133 1427 tmp = R*R-(x-x0)*(x-x0);
a015e406 1428 if(tmp <= 0.) continue;
1429 tmp = TMath::Sqrt(tmp);
3b57a3f7 1430
1431 // y: R^2 = (x - x0)^2 + (y - y0)^2
1432 // => y = y0 +/- Sqrt(R^2 - (x - x0)^2)
1433 tracklets[ip].SetYref(0, y0 - (y0>0.?1.:-1)*tmp);
1434 // => dy/dx = (x - x0)/Sqrt(R^2 - (x - x0)^2)
1435 tracklets[ip].SetYref(1, (x - x0) / tmp);
1436 tracklets[ip].SetZref(0, z0 + dzdx * (x - xref));
1437 tracklets[ip].SetZref(1, dzdx);
1438 tracklets[ip].SetC(C);
1439 tracklets[ip].SetChi2(chi2);
1440 }
1441 }
3b57a3f7 1442 //update track points array
1443 if(np && points){
1444 Float_t xyz[3];
1445 for(int ip=0; ip<np; ip++){
1446 points[ip].GetXYZ(xyz);
60e55aee 1447 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 1448 xyz[2] = z0 + dzdx * (xyz[0] - xref);
1449 points[ip].SetXYZ(xyz);
1450 }
1451 }
1452
3b57a3f7 1453 return chi2;
1454}
1455
1456
1bf51039 1457//____________________________________________________________________
1458Double_t AliTRDtrackerV1::FitKalman(AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t up, Int_t np, AliTrackPoint *points)
1459{
1460// Kalman filter implementation for the TRD.
1461// It returns the positions of the fit in the array "points"
1462//
1463// Author : A.Bercuci@gsi.de
1464
3cfaffa4 1465 // printf("Start track @ x[%f]\n", track->GetX());
1bf51039 1466
1467 //prepare marker points along the track
1468 Int_t ip = np ? 0 : 1;
1469 while(ip<np){
1470 if((up?-1:1) * (track->GetX() - points[ip].GetX()) > 0.) break;
1471 //printf("AliTRDtrackerV1::FitKalman() : Skip track marker x[%d] = %7.3f. Before track start ( %7.3f ).\n", ip, points[ip].GetX(), track->GetX());
1472 ip++;
1473 }
1474 //if(points) printf("First marker point @ x[%d] = %f\n", ip, points[ip].GetX());
1475
1476
1477 AliTRDseedV1 tracklet, *ptrTracklet = 0x0;
1478
1479 //Loop through the TRD planes
1480 for (Int_t jplane = 0; jplane < kNPlanes; jplane++) {
1481 // GET TRACKLET OR BUILT IT
1482 Int_t iplane = up ? jplane : kNPlanes - 1 - jplane;
1483 if(tracklets){
1484 if(!(ptrTracklet = &tracklets[iplane])) continue;
1485 }else{
1486 if(!(ptrTracklet = track->GetTracklet(iplane))){
1487 /*AliTRDtrackerV1 *tracker = 0x0;
1488 if(!(tracker = dynamic_cast<AliTRDtrackerV1*>( AliTRDReconstructor::Tracker()))) continue;
1489 ptrTracklet = new(&tracklet) AliTRDseedV1(iplane);
1490 if(!tracker->MakeTracklet(ptrTracklet, track)) */
1491 continue;
1492 }
1493 }
1494 if(!ptrTracklet->IsOK()) continue;
1495
1496 Double_t x = ptrTracklet->GetX0();
1497
1498 while(ip < np){
1499 //don't do anything if next marker is after next update point.
1500 if((up?-1:1) * (points[ip].GetX() - x) - fgkMaxStep < 0) break;
1bf51039 1501 if(((up?-1:1) * (points[ip].GetX() - track->GetX()) < 0) && !PropagateToX(*track, points[ip].GetX(), fgkMaxStep)) return -1.;
1502
1503 Double_t xyz[3]; // should also get the covariance
3cfaffa4 1504 track->GetXYZ(xyz);
1505 track->Global2LocalPosition(xyz, track->GetAlpha());
1506 points[ip].SetXYZ(xyz[0], xyz[1], xyz[2]);
1bf51039 1507 ip++;
1508 }
3cfaffa4 1509 // printf("plane[%d] tracklet[%p] x[%f]\n", iplane, ptrTracklet, x);
1bf51039 1510
3cfaffa4 1511 // Propagate closer to the next update point
1bf51039 1512 if(((up?-1:1) * (x - track->GetX()) + fgkMaxStep < 0) && !PropagateToX(*track, x + (up?-1:1)*fgkMaxStep, fgkMaxStep)) return -1.;
1513
1514 if(!AdjustSector(track)) return -1;
1515 if(TMath::Abs(track->GetSnp()) > fgkMaxSnp) return -1;
1516
1517 //load tracklet to the tracker and the track
1518/* Int_t index;
1519 if((index = FindTracklet(ptrTracklet)) < 0){
1520 ptrTracklet = SetTracklet(&tracklet);
1521 index = fTracklets->GetEntriesFast()-1;
1522 }
1523 track->SetTracklet(ptrTracklet, index);*/
1524
1525
1526 // register tracklet to track with tracklet creation !!
1527 // PropagateBack : loaded tracklet to the tracker and update index
1528 // RefitInward : update index
1529 // MakeTrack : loaded tracklet to the tracker and update index
1530 if(!tracklets) track->SetTracklet(ptrTracklet, -1);
1531
1532
1533 //Calculate the mean material budget along the path inside the chamber
1534 Double_t xyz0[3]; track->GetXYZ(xyz0);
1535 Double_t alpha = track->GetAlpha();
1536 Double_t xyz1[3], y, z;
1537 if(!track->GetProlongation(x, y, z)) return -1;
1538 xyz1[0] = x * TMath::Cos(alpha) - y * TMath::Sin(alpha);
1539 xyz1[1] = +x * TMath::Sin(alpha) + y * TMath::Cos(alpha);
1540 xyz1[2] = z;
3cfaffa4 1541 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 1542 Double_t param[7];
3cfaffa4 1543 if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param) <=0.) break;
1bf51039 1544 Double_t xrho = param[0]*param[4]; // density*length
1545 Double_t xx0 = param[1]; // radiation length
1546
1547 //Propagate the track
1548 track->PropagateTo(x, xx0, xrho);
1549 if (!AdjustSector(track)) break;
1550
1551 //Update track
b72f4eaf 1552 Double_t cov[3]; ptrTracklet->GetCovAt(x, cov);
1553 Double_t p[2] = { ptrTracklet->GetY(), ptrTracklet->GetZ()};
1554 Double_t chi2 = ((AliExternalTrackParam*)track)->GetPredictedChi2(p, cov);
1555 if(chi2<1e+10) track->Update(p, cov, chi2);
1bf51039 1556 if(!up) continue;
1557
1558 //Reset material budget if 2 consecutive gold
1559 if(iplane>0 && track->GetTracklet(iplane-1) && ptrTracklet->GetN() + track->GetTracklet(iplane-1)->GetN() > 20) track->SetBudget(2, 0.);
1560 } // end planes loop
1561
1562 // extrapolation
1563 while(ip < np){
1564 if(((up?-1:1) * (points[ip].GetX() - track->GetX()) < 0) && !PropagateToX(*track, points[ip].GetX(), fgkMaxStep)) return -1.;
1565
1566 Double_t xyz[3]; // should also get the covariance
3cfaffa4 1567 track->GetXYZ(xyz);
1568 track->Global2LocalPosition(xyz, track->GetAlpha());
1569 points[ip].SetXYZ(xyz[0], xyz[1], xyz[2]);
1bf51039 1570 ip++;
1571 }
1572
1573 return track->GetChi2();
1574}
3b57a3f7 1575
eb38ed55 1576//_________________________________________________________________________
bb56afff 1577Float_t AliTRDtrackerV1::CalculateChi2Z(AliTRDseedV1 *tracklets, Double_t offset, Double_t slope, Double_t xref)
eb38ed55 1578{
41702fec 1579 //
1580 // Calculates the chi2-value of the track in z-Direction including tilting pad correction.
1581 // A linear dependence on the x-value serves as a model.
1582 // The parameters are related to the tilted Riemann fit.
1583 // Parameters: - Array of tracklets (AliTRDseedV1) related to the track candidate
1584 // - the offset for the reference x
1585 // - the slope
1586 // - the reference x position
1587 // Output: - The Chi2 value of the track in z-Direction
1588 //
1589 Float_t chi2Z = 0, nLayers = 0;
053767a4 1590 for (Int_t iLayer = 0; iLayer < AliTRDgeometry::kNlayer; iLayer++) {
41702fec 1591 if(!tracklets[iLayer].IsOK()) continue;
1592 Double_t z = offset + slope * (tracklets[iLayer].GetX0() - xref);
e3cf3d02 1593 chi2Z += TMath::Abs(tracklets[iLayer].GetZfit(0) - z);
41702fec 1594 nLayers++;
1595 }
1596 chi2Z /= TMath::Max((nLayers - 3.0),1.0);
1597 return chi2Z;
eb38ed55 1598}
1599
bccda319 1600//_____________________________________________________________________________
1601Int_t AliTRDtrackerV1::PropagateToX(AliTRDtrackV1 &t, Double_t xToGo, Double_t maxStep)
1602{
41702fec 1603 //
1604 // Starting from current X-position of track <t> this function
1605 // extrapolates the track up to radial position <xToGo>.
1606 // Returns 1 if track reaches the plane, and 0 otherwise
1607 //
bccda319 1608
41702fec 1609 const Double_t kEpsilon = 0.00001;
bccda319 1610
41702fec 1611 // Current track X-position
1612 Double_t xpos = t.GetX();
bccda319 1613
41702fec 1614 // Direction: inward or outward
1615 Double_t dir = (xpos < xToGo) ? 1.0 : -1.0;
bccda319 1616
41702fec 1617 while (((xToGo - xpos) * dir) > kEpsilon) {
bccda319 1618
41702fec 1619 Double_t xyz0[3];
1620 Double_t xyz1[3];
1621 Double_t param[7];
1622 Double_t x;
1623 Double_t y;
1624 Double_t z;
bccda319 1625
41702fec 1626 // The next step size
1627 Double_t step = dir * TMath::Min(TMath::Abs(xToGo-xpos),maxStep);
bccda319 1628
41702fec 1629 // Get the global position of the starting point
1630 t.GetXYZ(xyz0);
bccda319 1631
41702fec 1632 // X-position after next step
1633 x = xpos + step;
bccda319 1634
41702fec 1635 // Get local Y and Z at the X-position of the next step
1636 if (!t.GetProlongation(x,y,z)) {
1637 return 0; // No prolongation possible
1638 }
bccda319 1639
41702fec 1640 // The global position of the end point of this prolongation step
1641 xyz1[0] = x * TMath::Cos(t.GetAlpha()) - y * TMath::Sin(t.GetAlpha());
1642 xyz1[1] = +x * TMath::Sin(t.GetAlpha()) + y * TMath::Cos(t.GetAlpha());
1643 xyz1[2] = z;
bccda319 1644
41702fec 1645 // Calculate the mean material budget between start and
1646 // end point of this prolongation step
83dea92e 1647 if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param)<=0.) return 0;
bccda319 1648
41702fec 1649 // Propagate the track to the X-position after the next step
9c87a076 1650 if (!t.PropagateTo(x, param[1], param[0]*param[4])) return 0;
bccda319 1651
41702fec 1652 // Rotate the track if necessary
1653 AdjustSector(&t);
bccda319 1654
41702fec 1655 // New track X-position
1656 xpos = t.GetX();
bccda319 1657
41702fec 1658 }
bccda319 1659
41702fec 1660 return 1;
bccda319 1661
1662}
1663
eb38ed55 1664
1665//_____________________________________________________________________________
1666Int_t AliTRDtrackerV1::ReadClusters(TClonesArray* &array, TTree *clusterTree) const
1667{
41702fec 1668 //
1669 // Reads AliTRDclusters from the file.
1670 // The names of the cluster tree and branches
1671 // should match the ones used in AliTRDclusterizer::WriteClusters()
1672 //
1673
1674 Int_t nsize = Int_t(clusterTree->GetTotBytes() / (sizeof(AliTRDcluster)));
1675 TObjArray *clusterArray = new TObjArray(nsize+1000);
1676
1677 TBranch *branch = clusterTree->GetBranch("TRDcluster");
1678 if (!branch) {
1679 AliError("Can't get the branch !");
1680 return 1;
1681 }
1682 branch->SetAddress(&clusterArray);
1683
1684 if(!fClusters){
8ae98148 1685 Float_t nclusters = fReconstructor->GetRecoParam()->GetNClusters();
1686 if(fReconstructor->IsHLT()) nclusters /= AliTRDgeometry::kNsector;
1687 array = new TClonesArray("AliTRDcluster", Int_t(nclusters));
41702fec 1688 array->SetOwner(kTRUE);
1689 }
1690
1691 // Loop through all entries in the tree
1692 Int_t nEntries = (Int_t) clusterTree->GetEntries();
1693 Int_t nbytes = 0;
1694 Int_t ncl = 0;
1695 AliTRDcluster *c = 0x0;
1696 for (Int_t iEntry = 0; iEntry < nEntries; iEntry++) {
1697 // Import the tree
1698 nbytes += clusterTree->GetEvent(iEntry);
1699
1700 // Get the number of points in the detector
1701 Int_t nCluster = clusterArray->GetEntriesFast();
1702 for (Int_t iCluster = 0; iCluster < nCluster; iCluster++) {
1703 if(!(c = (AliTRDcluster *) clusterArray->UncheckedAt(iCluster))) continue;
1704 c->SetInChamber();
1705 new((*fClusters)[ncl++]) AliTRDcluster(*c);
1706 delete (clusterArray->RemoveAt(iCluster));
1707 }
1708
1709 }
1710 delete clusterArray;
1711
1712 return 0;
eb38ed55 1713}
1714
1715//_____________________________________________________________________________
1716Int_t AliTRDtrackerV1::LoadClusters(TTree *cTree)
1717{
41702fec 1718 //
66f6bfd9 1719 // Fills clusters into TRD tracking sectors
41702fec 1720 //
41702fec 1721
48f8adf3 1722 if(!fReconstructor->IsWritingClusters()){
1723 fClusters = AliTRDReconstructor::GetClusters();
1724 } else {
66f6bfd9 1725 if (ReadClusters(fClusters, cTree)) {
1726 AliError("Problem with reading the clusters !");
1727 return 1;
1728 }
1729 }
1730 SetClustersOwner();
1731
48f8adf3 1732 if(!fClusters || !fClusters->GetEntriesFast()){
66f6bfd9 1733 AliInfo("No TRD clusters");
41702fec 1734 return 1;
1735 }
66f6bfd9 1736
1737 //Int_t nin =
1738 BuildTrackingContainers();
1739
1740 //Int_t ncl = fClusters->GetEntriesFast();
1741 //AliInfo(Form("Clusters %d [%6.2f %% in the active volume]", ncl, 100.*float(nin)/ncl));
1742
1743 return 0;
1744}
1745
1746//_____________________________________________________________________________
1747Int_t AliTRDtrackerV1::LoadClusters(TClonesArray *clusters)
1748{
1749 //
1750 // Fills clusters into TRD tracking sectors
1751 // Function for use in the HLT
1752
1753 if(!clusters || !clusters->GetEntriesFast()){
1754 AliInfo("No TRD clusters");
41702fec 1755 return 1;
1756 }
1757
66f6bfd9 1758 fClusters = clusters;
1759 SetClustersOwner();
1760
1761 //Int_t nin =
1762 BuildTrackingContainers();
1763
1764 //Int_t ncl = fClusters->GetEntriesFast();
1765 //AliInfo(Form("Clusters %d [%6.2f %% in the active volume]", ncl, 100.*float(nin)/ncl));
1766
1767 return 0;
1768}
1769
1770
1771//____________________________________________________________________
1772Int_t AliTRDtrackerV1::BuildTrackingContainers()
1773{
1774// Building tracking containers for clusters
1775
1776 Int_t nin =0, icl = fClusters->GetEntriesFast();
41702fec 1777 while (icl--) {
1778 AliTRDcluster *c = (AliTRDcluster *) fClusters->UncheckedAt(icl);
1779 if(c->IsInChamber()) nin++;
1780 Int_t detector = c->GetDetector();
1781 Int_t sector = fGeom->GetSector(detector);
053767a4 1782 Int_t stack = fGeom->GetStack(detector);
1783 Int_t layer = fGeom->GetLayer(detector);
41702fec 1784
053767a4 1785 fTrSec[sector].GetChamber(stack, layer, kTRUE)->InsertCluster(c, icl);
41702fec 1786 }
b0a48c4d 1787
1788 const AliTRDCalDet *cal = AliTRDcalibDB::Instance()->GetT0Det();
053767a4 1789 for(int isector =0; isector<AliTRDgeometry::kNsector; isector++){
41702fec 1790 if(!fTrSec[isector].GetNChambers()) continue;
b0a48c4d 1791 fTrSec[isector].Init(fReconstructor, cal);
41702fec 1792 }
66f6bfd9 1793
1794 return nin;
eb38ed55 1795}
1796
1797
66f6bfd9 1798
0906e73e 1799//____________________________________________________________________
1800void AliTRDtrackerV1::UnloadClusters()
1801{
41702fec 1802 //
1803 // Clears the arrays of clusters and tracks. Resets sectors and timebins
1804 //
0906e73e 1805
41702fec 1806 if(fTracks) fTracks->Delete();
1807 if(fTracklets) fTracklets->Delete();
48f8adf3 1808 if(fClusters){
1809 if(IsClustersOwner()) fClusters->Delete();
1810
1811 // save clusters array in the reconstructor for further use.
1812 if(!fReconstructor->IsWritingClusters()){
1813 AliTRDReconstructor::SetClusters(fClusters);
1814 SetClustersOwner(kFALSE);
1815 } else AliTRDReconstructor::SetClusters(0x0);
1816 }
0906e73e 1817
053767a4 1818 for (int i = 0; i < AliTRDgeometry::kNsector; i++) fTrSec[i].Clear();
0906e73e 1819
41702fec 1820 // Increment the Event Number
1821 AliTRDtrackerDebug::SetEventNumber(AliTRDtrackerDebug::GetEventNumber() + 1);
eb38ed55 1822}
0906e73e 1823
fac58f00 1824// //____________________________________________________________________
1825// void AliTRDtrackerV1::UseClusters(const AliKalmanTrack *t, Int_t) const
1826// {
1827// const AliTRDtrackV1 *track = dynamic_cast<const AliTRDtrackV1*>(t);
1828// if(!track) return;
1829//
1830// AliTRDseedV1 *tracklet = 0x0;
1831// for(Int_t ily=AliTRDgeometry::kNlayer; ily--;){
1832// if(!(tracklet = track->GetTracklet(ily))) continue;
1833// AliTRDcluster *c = 0x0;
8d2bec9e 1834// for(Int_t ic=AliTRDseed::kNclusters; ic--;){
fac58f00 1835// if(!(c=tracklet->GetClusters(ic))) continue;
1836// c->Use();
1837// }
1838// }
1839// }
1840//
b1957d3c 1841
eb38ed55 1842//_____________________________________________________________________________
1843Bool_t AliTRDtrackerV1::AdjustSector(AliTRDtrackV1 *track)
1844{
41702fec 1845 //
1846 // Rotates the track when necessary
1847 //
1848
1849 Double_t alpha = AliTRDgeometry::GetAlpha();
1850 Double_t y = track->GetY();
1851 Double_t ymax = track->GetX()*TMath::Tan(0.5*alpha);
3cfaffa4 1852
41702fec 1853 if (y > ymax) {
1854 if (!track->Rotate( alpha)) {
1855 return kFALSE;
1856 }
1857 }
1858 else if (y < -ymax) {
1859 if (!track->Rotate(-alpha)) {
1860 return kFALSE;
1861 }
1862 }
1863
1864 return kTRUE;
0906e73e 1865
1866}
1867
eb38ed55 1868
0906e73e 1869//____________________________________________________________________
1870AliTRDseedV1* AliTRDtrackerV1::GetTracklet(AliTRDtrackV1 *track, Int_t p, Int_t &idx)
1871{
41702fec 1872 // Find tracklet for TRD track <track>
1873 // Parameters
1874 // - track
1875 // - sector
1876 // - plane
1877 // - index
1878 // Output
1879 // tracklet
1880 // index
1881 // Detailed description
1882 //
1883 idx = track->GetTrackletIndex(p);
1884 AliTRDseedV1 *tracklet = (idx==0xffff) ? 0x0 : (AliTRDseedV1*)fTracklets->UncheckedAt(idx);
1885
1886 return tracklet;
0906e73e 1887}
1888
1889//____________________________________________________________________
3b57a3f7 1890AliTRDseedV1* AliTRDtrackerV1::SetTracklet(AliTRDseedV1 *tracklet)
0906e73e 1891{
41702fec 1892 // Add this tracklet to the list of tracklets stored in the tracker
1893 //
1894 // Parameters
1895 // - tracklet : pointer to the tracklet to be added to the list
1896 //
1897 // Output
1898 // - the index of the new tracklet in the tracker tracklets list
1899 //
1900 // Detailed description
1901 // Build the tracklets list if it is not yet created (late initialization)
1902 // and adds the new tracklet to the list.
1903 //
1904 if(!fTracklets){
053767a4 1905 fTracklets = new TClonesArray("AliTRDseedV1", AliTRDgeometry::Nsector()*kMaxTracksStack);
41702fec 1906 fTracklets->SetOwner(kTRUE);
1907 }
1908 Int_t nentries = fTracklets->GetEntriesFast();
1909 return new ((*fTracklets)[nentries]) AliTRDseedV1(*tracklet);
972ef65e 1910}
1911
d20df6fc 1912//____________________________________________________________________
1913AliTRDtrackV1* AliTRDtrackerV1::SetTrack(AliTRDtrackV1 *track)
1914{
1915 // Add this track to the list of tracks stored in the tracker
1916 //
1917 // Parameters
1918 // - track : pointer to the track to be added to the list
1919 //
1920 // Output
1921 // - the pointer added
1922 //
1923 // Detailed description
1924 // Build the tracks list if it is not yet created (late initialization)
1925 // and adds the new track to the list.
1926 //
1927 if(!fTracks){
053767a4 1928 fTracks = new TClonesArray("AliTRDtrackV1", AliTRDgeometry::Nsector()*kMaxTracksStack);
d20df6fc 1929 fTracks->SetOwner(kTRUE);
1930 }
1931 Int_t nentries = fTracks->GetEntriesFast();
1932 return new ((*fTracks)[nentries]) AliTRDtrackV1(*track);
1933}
1934
1935
0906e73e 1936
e4f2f73d 1937//____________________________________________________________________
eb38ed55 1938Int_t AliTRDtrackerV1::Clusters2TracksSM(Int_t sector, AliESDEvent *esd)
e4f2f73d 1939{
41702fec 1940 //
1941 // Steer tracking for one SM.
1942 //
1943 // Parameters :
1944 // sector : Array of (SM) propagation layers containing clusters
1945 // esd : The current ESD event. On output it contains the also
1946 // the ESD (TRD) tracks found in this SM.
1947 //
1948 // Output :
1949 // Number of tracks found in this TRD supermodule.
1950 //
1951 // Detailed description
1952 //
1953 // 1. Unpack AliTRDpropagationLayers objects for each stack.
1954 // 2. Launch stack tracking.
1955 // See AliTRDtrackerV1::Clusters2TracksStack() for details.
1956 // 3. Pack results in the ESD event.
1957 //
1958
1959 // allocate space for esd tracks in this SM
1960 TClonesArray esdTrackList("AliESDtrack", 2*kMaxTracksStack);
1961 esdTrackList.SetOwner();
1962
1963 Int_t nTracks = 0;
1964 Int_t nChambers = 0;
1965 AliTRDtrackingChamber **stack = 0x0, *chamber = 0x0;
053767a4 1966 for(int istack = 0; istack<AliTRDgeometry::kNstack; istack++){
41702fec 1967 if(!(stack = fTrSec[sector].GetStack(istack))) continue;
1968 nChambers = 0;
053767a4 1969 for(int ilayer=0; ilayer<AliTRDgeometry::kNlayer; ilayer++){
1970 if(!(chamber = stack[ilayer])) continue;
3a039a31 1971 if(chamber->GetNClusters() < fgNTimeBins * fReconstructor->GetRecoParam() ->GetFindableClusters()) continue;
41702fec 1972 nChambers++;
053767a4 1973 //AliInfo(Form("sector %d stack %d layer %d clusters %d", sector, istack, ilayer, chamber->GetNClusters()));
41702fec 1974 }
1975 if(nChambers < 4) continue;
1976 //AliInfo(Form("Doing stack %d", istack));
1977 nTracks += Clusters2TracksStack(stack, &esdTrackList);
1978 }
1979 //AliInfo(Form("Found %d tracks in SM %d [%d]\n", nTracks, sector, esd->GetNumberOfTracks()));
1980
1981 for(int itrack=0; itrack<nTracks; itrack++)
1982 esd->AddTrack((AliESDtrack*)esdTrackList[itrack]);
1983
1984 // Reset Track and Candidate Number
1985 AliTRDtrackerDebug::SetCandidateNumber(0);
1986 AliTRDtrackerDebug::SetTrackNumber(0);
1987 return nTracks;
e4f2f73d 1988}
1989
1990//____________________________________________________________________
eb38ed55 1991Int_t AliTRDtrackerV1::Clusters2TracksStack(AliTRDtrackingChamber **stack, TClonesArray *esdTrackList)
e4f2f73d 1992{
41702fec 1993 //
1994 // Make tracks in one TRD stack.
1995 //
1996 // Parameters :
1997 // layer : Array of stack propagation layers containing clusters
1998 // esdTrackList : Array of ESD tracks found by the stand alone tracker.
1999 // On exit the tracks found in this stack are appended.
2000 //
2001 // Output :
2002 // Number of tracks found in this stack.
2003 //
2004 // Detailed description
2005 //
2006 // 1. Find the 3 most useful seeding chambers. See BuildSeedingConfigs() for details.
2007 // 2. Steer AliTRDtrackerV1::MakeSeeds() for 3 seeding layer configurations.
2008 // See AliTRDtrackerV1::MakeSeeds() for more details.
2009 // 3. Arrange track candidates in decreasing order of their quality
2010 // 4. Classify tracks in 5 categories according to:
2011 // a) number of layers crossed
2012 // b) track quality
2013 // 5. Sign clusters by tracks in decreasing order of track quality
2014 // 6. Build AliTRDtrack out of seeding tracklets
2015 // 7. Cook MC label
2016 // 8. Build ESD track and register it to the output list
2017 //
2018
b0a48c4d 2019 const AliTRDCalDet *cal = AliTRDcalibDB::Instance()->GetT0Det();
41702fec 2020 AliTRDtrackingChamber *chamber = 0x0;
fac58f00 2021 AliTRDtrackingChamber **ci = 0x0;
41702fec 2022 AliTRDseedV1 sseed[kMaxTracksStack*6]; // to be initialized
2023 Int_t pars[4]; // MakeSeeds parameters
2024
2025 //Double_t alpha = AliTRDgeometry::GetAlpha();
2026 //Double_t shift = .5 * alpha;
2027 Int_t configs[kNConfigs];
2028
fac58f00 2029 // Purge used clusters from the containers
2030 ci = &stack[0];
2031 for(Int_t ic = kNPlanes; ic--; ci++){
2032 if(!(*ci)) continue;
2033 (*ci)->Update();
2034 }
2035
41702fec 2036 // Build initial seeding configurations
2037 Double_t quality = BuildSeedingConfigs(stack, configs);
eb2b4f91 2038 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 10){
41702fec 2039 AliInfo(Form("Plane config %d %d %d Quality %f"
2040 , configs[0], configs[1], configs[2], quality));
2041 }
d931f2aa 2042
41702fec 2043
2044 // Initialize contors
2045 Int_t ntracks, // number of TRD track candidates
2046 ntracks1, // number of registered TRD tracks/iter
2047 ntracks2 = 0; // number of all registered TRD tracks in stack
2048 fSieveSeeding = 0;
d931f2aa 2049
2050 // Get stack index
fac58f00 2051 Int_t ic = 0; ci = &stack[0];
2052 while(ic<kNPlanes && !(*ci)){ic++; ci++;}
2053 if(!(*ci)) return ntracks2;
2054 Int_t istack = fGeom->GetStack((*ci)->GetDetector());
d931f2aa 2055
41702fec 2056 do{
2057 // Loop over seeding configurations
2058 ntracks = 0; ntracks1 = 0;
2059 for (Int_t iconf = 0; iconf<3; iconf++) {
2060 pars[0] = configs[iconf];
2061 pars[1] = ntracks;
d931f2aa 2062 pars[2] = istack;
41702fec 2063 ntracks = MakeSeeds(stack, &sseed[6*ntracks], pars);
2064 if(ntracks == kMaxTracksStack) break;
2065 }
eb2b4f91 2066 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 10) AliInfo(Form("Candidate TRD tracks %d in iteration %d.", ntracks, fSieveSeeding));
41702fec 2067
2068 if(!ntracks) break;
2069
2070 // Sort the seeds according to their quality
2071 Int_t sort[kMaxTracksStack];
2072 TMath::Sort(ntracks, fTrackQuality, sort, kTRUE);
2073
2074 // Initialize number of tracks so far and logic switches
2075 Int_t ntracks0 = esdTrackList->GetEntriesFast();
2076 Bool_t signedTrack[kMaxTracksStack];
2077 Bool_t fakeTrack[kMaxTracksStack];
2078 for (Int_t i=0; i<ntracks; i++){
2079 signedTrack[i] = kFALSE;
2080 fakeTrack[i] = kFALSE;
2081 }
2082 //AliInfo("Selecting track candidates ...");
2083
2084 // Sieve clusters in decreasing order of track quality
2085 Double_t trackParams[7];
2086 // AliTRDseedV1 *lseed = 0x0;
2087 Int_t jSieve = 0, candidates;
2088 do{
2089 //AliInfo(Form("\t\tITER = %i ", jSieve));
2090
2091 // Check track candidates
2092 candidates = 0;
2093 for (Int_t itrack = 0; itrack < ntracks; itrack++) {
804bb02e 2094 Int_t trackIndex = sort[itrack];
2095 if (signedTrack[trackIndex] || fakeTrack[trackIndex]) continue;
41702fec 2096
2097
804bb02e 2098 // Calculate track parameters from tracklets seeds
804bb02e 2099 Int_t ncl = 0;
2100 Int_t nused = 0;
2101 Int_t nlayers = 0;
2102 Int_t findable = 0;
2103 for (Int_t jLayer = 0; jLayer < kNPlanes; jLayer++) {
2104 Int_t jseed = kNPlanes*trackIndex+jLayer;
2105 if(!sseed[jseed].IsOK()) continue;
f29f13a6 2106 if (TMath::Abs(sseed[jseed].GetYref(0) / sseed[jseed].GetX0()) < 0.158) findable++;
eede7907 2107 // TODO here we get a sig fault which should never happen !
804bb02e 2108 sseed[jseed].UpdateUsed();
2109 ncl += sseed[jseed].GetN2();
2110 nused += sseed[jseed].GetNUsed();
2111 nlayers++;
804bb02e 2112 }
2113
f29f13a6 2114 // Filter duplicated tracks
2115 if (nused > 30){
2116 //printf("Skip %d nused %d\n", trackIndex, nused);
2117 fakeTrack[trackIndex] = kTRUE;
2118 continue;
2119 }
2120 if (Float_t(nused)/ncl >= .25){
2121 //printf("Skip %d nused/ncl >= .25\n", trackIndex);
2122 fakeTrack[trackIndex] = kTRUE;
2123 continue;
2124 }
41702fec 2125
f29f13a6 2126 // Classify tracks
2127 Bool_t skip = kFALSE;
2128 switch(jSieve){
2129 case 0:
2130 if(nlayers < 6) {skip = kTRUE; break;}
2131 if(TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -5.){skip = kTRUE; break;}
2132 break;
2133
2134 case 1:
2135 if(nlayers < findable){skip = kTRUE; break;}
2136 if(TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -4.){skip = kTRUE; break;}
2137 break;
2138
2139 case 2:
2140 if ((nlayers == findable) || (nlayers == 6)) { skip = kTRUE; break;}
2141 if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -6.0){skip = kTRUE; break;}
2142 break;
2143
2144 case 3:
2145 if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -5.){skip = kTRUE; break;}
2146 break;
2147
2148 case 4:
2149 if (nlayers == 3){skip = kTRUE; break;}
2150 //if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) - nused/(nlayers-3.0) < -15.0){skip = kTRUE; break;}
2151 break;
2152 }
2153 if(skip){
2154 candidates++;
2155 //printf("REJECTED : %d [%d] nlayers %d trackQuality = %e nused %d\n", itrack, trackIndex, nlayers, fTrackQuality[trackIndex], nused);
2156 continue;
2157 }
2158 signedTrack[trackIndex] = kTRUE;
2159
2160 // Build track parameters
2161 AliTRDseedV1 *lseed =&sseed[trackIndex*6];
2162 /* Int_t idx = 0;
2163 while(idx<3 && !lseed->IsOK()) {
2164 idx++;
2165 lseed++;
2166 }*/
2167 Double_t x = lseed->GetX0();// - 3.5;
2168 trackParams[0] = x; //NEW AB
2169 trackParams[1] = lseed->GetYref(0); // lseed->GetYat(x);
2170 trackParams[2] = lseed->GetZref(0); // lseed->GetZat(x);
2171 trackParams[3] = TMath::Sin(TMath::ATan(lseed->GetYref(1)));
2172 trackParams[4] = lseed->GetZref(1) / TMath::Sqrt(1. + lseed->GetYref(1) * lseed->GetYref(1));
2173 trackParams[5] = lseed->GetC();
2174 Int_t ich = 0; while(!(chamber = stack[ich])) ich++;
2175 trackParams[6] = fGeom->GetSector(chamber->GetDetector());/* *alpha+shift; // Supermodule*/
2176
2177 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){
eb2b4f91 2178 //AliInfo(Form("Track %d [%d] nlayers %d trackQuality = %e nused %d, yref = %3.3f", itrack, trackIndex, nlayers, fTrackQuality[trackIndex], nused, trackParams[1]));
f29f13a6 2179
f29f13a6 2180 AliTRDseedV1 *dseed[6];
b82b4de1 2181 for(Int_t iseed = AliTRDgeometry::kNlayer; iseed--;) dseed[iseed] = new AliTRDseedV1(lseed[iseed]);
f29f13a6 2182
2183 //Int_t eventNrInFile = esd->GetEventNumberInFile();
2184 //AliInfo(Form("Number of clusters %d.", nclusters));
2185 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2186 Int_t trackNumber = AliTRDtrackerDebug::GetTrackNumber();
2187 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2188 TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
2189 cstreamer << "Clusters2TracksStack"
2190 << "EventNumber=" << eventNumber
2191 << "TrackNumber=" << trackNumber
2192 << "CandidateNumber=" << candidateNumber
2193 << "Iter=" << fSieveSeeding
2194 << "Like=" << fTrackQuality[trackIndex]
2195 << "S0.=" << dseed[0]
2196 << "S1.=" << dseed[1]
2197 << "S2.=" << dseed[2]
2198 << "S3.=" << dseed[3]
2199 << "S4.=" << dseed[4]
2200 << "S5.=" << dseed[5]
2201 << "p0=" << trackParams[0]
2202 << "p1=" << trackParams[1]
2203 << "p2=" << trackParams[2]
2204 << "p3=" << trackParams[3]
2205 << "p4=" << trackParams[4]
2206 << "p5=" << trackParams[5]
2207 << "p6=" << trackParams[6]
f29f13a6 2208 << "Ncl=" << ncl
2209 << "NLayers=" << nlayers
2210 << "Findable=" << findable
2211 << "NUsed=" << nused
2212 << "\n";
2213 }
d877f55f 2214
f29f13a6 2215 AliTRDtrackV1 *track = MakeTrack(&sseed[trackIndex*kNPlanes], trackParams);
2216 if(!track){
2217 AliWarning("Fail to build a TRD Track.");
2218 continue;
d877f55f 2219 }
41702fec 2220
f29f13a6 2221 //AliInfo("End of MakeTrack()");
2222 AliESDtrack *esdTrack = new ((*esdTrackList)[ntracks0++]) AliESDtrack();
2223 esdTrack->UpdateTrackParams(track, AliESDtrack::kTRDout);
2224 esdTrack->SetLabel(track->GetLabel());
2225 track->UpdateESDtrack(esdTrack);
2226 // write ESD-friends if neccessary
2227 if (fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 0){
2228 AliTRDtrackV1 *calibTrack = new AliTRDtrackV1(*track);
2229 calibTrack->SetOwner();
2230 esdTrack->AddCalibObject(calibTrack);
2231 }
2232 ntracks1++;
2233 AliTRDtrackerDebug::SetTrackNumber(AliTRDtrackerDebug::GetTrackNumber() + 1);
41702fec 2234 }
2235
2236 jSieve++;
2237 } while(jSieve<5 && candidates); // end track candidates sieve
2238 if(!ntracks1) break;
2239
2240 // increment counters
2241 ntracks2 += ntracks1;
4302c900 2242
2243 if(fReconstructor->IsHLT()) break;
41702fec 2244 fSieveSeeding++;
2245
2246 // Rebuild plane configurations and indices taking only unused clusters into account
2247 quality = BuildSeedingConfigs(stack, configs);
3a039a31 2248 if(quality < 1.E-7) break; //fReconstructor->GetRecoParam() ->GetPlaneQualityThreshold()) break;
41702fec 2249
2250 for(Int_t ip = 0; ip < kNPlanes; ip++){
2251 if(!(chamber = stack[ip])) continue;
b0a48c4d 2252 chamber->Build(fGeom, cal);//Indices(fSieveSeeding);
41702fec 2253 }
2254
eb2b4f91 2255 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 10){
41702fec 2256 AliInfo(Form("Sieve level %d Plane config %d %d %d Quality %f", fSieveSeeding, configs[0], configs[1], configs[2], quality));
2257 }
2258 } while(fSieveSeeding<10); // end stack clusters sieve
2259
2260
2261
2262 //AliInfo(Form("Registered TRD tracks %d in stack %d.", ntracks2, pars[1]));
2263
2264 return ntracks2;
e4f2f73d 2265}
2266
2267//___________________________________________________________________
eb38ed55 2268Double_t AliTRDtrackerV1::BuildSeedingConfigs(AliTRDtrackingChamber **stack, Int_t *configs)
e4f2f73d 2269{
41702fec 2270 //
2271 // Assign probabilities to chambers according to their
2272 // capability of producing seeds.
2273 //
2274 // Parameters :
2275 //
2276 // layers : Array of stack propagation layers for all 6 chambers in one stack
2277 // configs : On exit array of configuration indexes (see GetSeedingConfig()
2278 // for details) in the decreasing order of their seeding probabilities.
2279 //
2280 // Output :
2281 //
2282 // Return top configuration quality
2283 //
2284 // Detailed description:
2285 //
2286 // To each chamber seeding configuration (see GetSeedingConfig() for
2287 // the list of all configurations) one defines 2 quality factors:
2288 // - an apriori topological quality (see GetSeedingConfig() for details) and
2289 // - a data quality based on the uniformity of the distribution of
2290 // clusters over the x range (time bins population). See CookChamberQA() for details.
2291 // The overall chamber quality is given by the product of this 2 contributions.
2292 //
2293
eb2b4f91 2294 Double_t chamberQ[kNPlanes];memset(chamberQ, 0, kNPlanes*sizeof(Double_t));
41702fec 2295 AliTRDtrackingChamber *chamber = 0x0;
2296 for(int iplane=0; iplane<kNPlanes; iplane++){
2297 if(!(chamber = stack[iplane])) continue;
2298 chamberQ[iplane] = (chamber = stack[iplane]) ? chamber->GetQuality() : 0.;
2299 }
2300
eb2b4f91 2301 Double_t tconfig[kNConfigs];memset(tconfig, 0, kNConfigs*sizeof(Double_t));
2302 Int_t planes[] = {0, 0, 0, 0};
41702fec 2303 for(int iconf=0; iconf<kNConfigs; iconf++){
2304 GetSeedingConfig(iconf, planes);
2305 tconfig[iconf] = fgTopologicQA[iconf];
2306 for(int iplane=0; iplane<4; iplane++) tconfig[iconf] *= chamberQ[planes[iplane]];
2307 }
2308
2309 TMath::Sort((Int_t)kNConfigs, tconfig, configs, kTRUE);
2310 // AliInfo(Form("q[%d] = %f", configs[0], tconfig[configs[0]]));
2311 // AliInfo(Form("q[%d] = %f", configs[1], tconfig[configs[1]]));
2312 // AliInfo(Form("q[%d] = %f", configs[2], tconfig[configs[2]]));
2313
2314 return tconfig[configs[0]];
e4f2f73d 2315}
2316
2317//____________________________________________________________________
eb38ed55 2318Int_t AliTRDtrackerV1::MakeSeeds(AliTRDtrackingChamber **stack, AliTRDseedV1 *sseed, Int_t *ipar)
e4f2f73d 2319{
41702fec 2320 //
2321 // Make tracklet seeds in the TRD stack.
2322 //
2323 // Parameters :
2324 // layers : Array of stack propagation layers containing clusters
2325 // sseed : Array of empty tracklet seeds. On exit they are filled.
2326 // ipar : Control parameters:
2327 // ipar[0] -> seeding chambers configuration
2328 // ipar[1] -> stack index
2329 // ipar[2] -> number of track candidates found so far
2330 //
2331 // Output :
2332 // Number of tracks candidates found.
2333 //
2334 // Detailed description
2335 //
2336 // The following steps are performed:
2337 // 1. Select seeding layers from seeding chambers
2338 // 2. Select seeding clusters from the seeding AliTRDpropagationLayerStack.
2339 // The clusters are taken from layer 3, layer 0, layer 1 and layer 2, in
2340 // this order. The parameters controling the range of accepted clusters in
2341 // layer 0, 1, and 2 are defined in AliTRDchamberTimeBin::BuildCond().
2342 // 3. Helix fit of the cluster set. (see AliTRDtrackerFitter::FitRieman(AliTRDcluster**))
2343 // 4. Initialize seeding tracklets in the seeding chambers.
2344 // 5. Filter 0.
2345 // Chi2 in the Y direction less than threshold ... (1./(3. - sLayer))
2346 // Chi2 in the Z direction less than threshold ... (1./(3. - sLayer))
2347 // 6. Attach clusters to seeding tracklets and find linear approximation of
2348 // the tracklet (see AliTRDseedV1::AttachClustersIter()). The number of used
2349 // clusters used by current seeds should not exceed ... (25).
2350 // 7. Filter 1.
2351 // All 4 seeding tracklets should be correctly constructed (see
2352 // AliTRDseedV1::AttachClustersIter())
2353 // 8. Helix fit of the seeding tracklets
2354 // 9. Filter 2.
2355 // Likelihood calculation of the fit. (See AliTRDtrackerV1::CookLikelihood() for details)
2356 // 10. Extrapolation of the helix fit to the other 2 chambers:
2357 // a) Initialization of extrapolation tracklet with fit parameters
2358 // b) Helix fit of tracklets
2359 // c) Attach clusters and linear interpolation to extrapolated tracklets
2360 // d) Helix fit of tracklets
2361 // 11. Improve seeding tracklets quality by reassigning clusters.
2362 // See AliTRDtrackerV1::ImproveSeedQuality() for details.
2363 // 12. Helix fit of all 6 seeding tracklets and chi2 calculation
2364 // 13. Hyperplane fit and track quality calculation. See AliTRDtrackerFitter::FitHyperplane() for details.
2365 // 14. Cooking labels for tracklets. Should be done only for MC
2366 // 15. Register seeds.
2367 //
2368
2369 AliTRDtrackingChamber *chamber = 0x0;
be24510a 2370 AliTRDcluster *c[kNSeedPlanes] = {0x0, 0x0, 0x0, 0x0}; // initilize seeding clusters
41702fec 2371 AliTRDseedV1 *cseed = &sseed[0]; // initialize tracklets for first track
2372 Int_t ncl, mcl; // working variable for looping over clusters
2373 Int_t index[AliTRDchamberTimeBin::kMaxClustersLayer], jndex[AliTRDchamberTimeBin::kMaxClustersLayer];
2374 // chi2 storage
2375 // chi2[0] = tracklet chi2 on the Z direction
2376 // chi2[1] = tracklet chi2 on the R direction
2377 Double_t chi2[4];
2378
41702fec 2379 // this should be data member of AliTRDtrack
2380 Double_t seedQuality[kMaxTracksStack];
2381
2382 // unpack control parameters
2383 Int_t config = ipar[0];
2384 Int_t ntracks = ipar[1];
d931f2aa 2385 Int_t istack = ipar[2];
41702fec 2386 Int_t planes[kNSeedPlanes]; GetSeedingConfig(config, planes);
be24510a 2387 Int_t planesExt[kNPlanes-kNSeedPlanes]; GetExtrapolationConfig(config, planesExt);
2388
2389
41702fec 2390 // Init chambers geometry
41702fec 2391 Double_t hL[kNPlanes]; // Tilting angle
2392 Float_t padlength[kNPlanes]; // pad lenghts
dd8059a8 2393 Float_t padwidth[kNPlanes]; // pad widths
41702fec 2394 AliTRDpadPlane *pp = 0x0;
2395 for(int iplane=0; iplane<kNPlanes; iplane++){
2396 pp = fGeom->GetPadPlane(iplane, istack);
bb79ccd5 2397 hL[iplane] = TMath::Tan(TMath::DegToRad()*pp->GetTiltingAngle());
41702fec 2398 padlength[iplane] = pp->GetLengthIPad();
dd8059a8 2399 padwidth[iplane] = pp->GetWidthIPad();
41702fec 2400 }
2401
eb2b4f91 2402 // Init anode wire position for chambers
e165b64b 2403 Double_t x0[kNPlanes], // anode wire position
eb2b4f91 2404 driftLength = .5*AliTRDgeometry::AmThick() - AliTRDgeometry::DrThick(); // drift length
2405 TGeoHMatrix *matrix = 0x0;
2406 Double_t loc[] = {AliTRDgeometry::AnodePos(), 0., 0.};
2407 Double_t glb[] = {0., 0., 0.};
2408 AliTRDtrackingChamber **cIter = &stack[0];
a3743898 2409 for(int iLayer=0; iLayer<kNPlanes; iLayer++,cIter++){
eb2b4f91 2410 if(!(*cIter)) continue;
e165b64b 2411 if(!(matrix = fGeom->GetClusterMatrix((*cIter)->GetDetector()))){
2412 continue;
2413 x0[iLayer] = fgkX0[iLayer];
2414 }
eb2b4f91 2415 matrix->LocalToMaster(loc, glb);
2416 x0[iLayer] = glb[0];
2417 }
2418
2419 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 10){
41702fec 2420 AliInfo(Form("Making seeds Stack[%d] Config[%d] Tracks[%d]...", istack, config, ntracks));
2421 }
2422
d931f2aa 2423 // Build seeding layers
d611c74f 2424 ResetSeedTB();
41702fec 2425 Int_t nlayers = 0;
41702fec 2426 for(int isl=0; isl<kNSeedPlanes; isl++){
2427 if(!(chamber = stack[planes[isl]])) continue;
3a039a31 2428 if(!chamber->GetSeedingLayer(fSeedTB[isl], fGeom, fReconstructor)) continue;
41702fec 2429 nlayers++;
41702fec 2430 }
eb2b4f91 2431 if(nlayers < kNSeedPlanes) return ntracks;
41702fec 2432
2433
2434 // Start finding seeds
2435 Double_t cond0[4], cond1[4], cond2[4];
2436 Int_t icl = 0;
d611c74f 2437 while((c[3] = (*fSeedTB[3])[icl++])){
41702fec 2438 if(!c[3]) continue;
d611c74f 2439 fSeedTB[0]->BuildCond(c[3], cond0, 0);
2440 fSeedTB[0]->GetClusters(cond0, index, ncl);
41702fec 2441 //printf("Found c[3] candidates 0 %d\n", ncl);
2442 Int_t jcl = 0;
2443 while(jcl<ncl) {
d611c74f 2444 c[0] = (*fSeedTB[0])[index[jcl++]];
41702fec 2445 if(!c[0]) continue;
2446 Double_t dx = c[3]->GetX() - c[0]->GetX();
2447 Double_t theta = (c[3]->GetZ() - c[0]->GetZ())/dx;
2448 Double_t phi = (c[3]->GetY() - c[0]->GetY())/dx;
d611c74f 2449 fSeedTB[1]->BuildCond(c[0], cond1, 1, theta, phi);
2450 fSeedTB[1]->GetClusters(cond1, jndex, mcl);
41702fec 2451 //printf("Found c[0] candidates 1 %d\n", mcl);
2452
2453 Int_t kcl = 0;
2454 while(kcl<mcl) {
d611c74f 2455 c[1] = (*fSeedTB[1])[jndex[kcl++]];
2456 if(!c[1]) continue;
2457 fSeedTB[2]->BuildCond(c[1], cond2, 2, theta, phi);
2458 c[2] = fSeedTB[2]->GetNearestCluster(cond2);
2459 //printf("Found c[1] candidate 2 %p\n", c[2]);
2460 if(!c[2]) continue;
2461
2462 // AliInfo("Seeding clusters found. Building seeds ...");
2463 // 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());
2464
804bb02e 2465 for (Int_t il = 0; il < kNPlanes; il++) cseed[il].Reset();
41702fec 2466
d611c74f 2467 FitRieman(c, chi2);
2468
d931f2aa 2469 AliTRDseedV1 *tseed = &cseed[0];
bb2db46c 2470 cIter = &stack[0];
2471 for(int iLayer=0; iLayer<kNPlanes; iLayer++, tseed++, cIter++){
2472 Int_t det = (*cIter) ? (*cIter)->GetDetector() : -1;
eb2b4f91 2473 tseed->SetDetector(det);
43d6ad34 2474 tseed->SetTilt(hL[iLayer]);
2475 tseed->SetPadLength(padlength[iLayer]);
dd8059a8 2476 tseed->SetPadWidth(padwidth[iLayer]);
3a039a31 2477 tseed->SetReconstructor(fReconstructor);
eb2b4f91 2478 tseed->SetX0(det<0 ? fR[iLayer]+driftLength : x0[iLayer]);
d611c74f 2479 tseed->Init(GetRiemanFitter());
f29f13a6 2480 tseed->SetStandAlone(kTRUE);
d611c74f 2481 }
2482
2483 Bool_t isFake = kFALSE;
3a039a31 2484 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){
d611c74f 2485 if (c[0]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
2486 if (c[1]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
2487 if (c[2]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
2488
2489 Double_t xpos[4];
2490 for(Int_t l = 0; l < kNSeedPlanes; l++) xpos[l] = fSeedTB[l]->GetX();
2491 Float_t yref[4];
2492 for(int il=0; il<4; il++) yref[il] = cseed[planes[il]].GetYref(0);
2493 Int_t ll = c[3]->GetLabel(0);
2494 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2495 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2496 AliRieman *rim = GetRiemanFitter();
29f95561 2497 TTreeSRedirector &cs0 = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
d611c74f 2498 cs0 << "MakeSeeds0"
2499 <<"EventNumber=" << eventNumber
2500 <<"CandidateNumber=" << candidateNumber
2501 <<"isFake=" << isFake
2502 <<"config=" << config
2503 <<"label=" << ll
2504 <<"chi2z=" << chi2[0]
2505 <<"chi2y=" << chi2[1]
2506 <<"Y2exp=" << cond2[0]
2507 <<"Z2exp=" << cond2[1]
2508 <<"X0=" << xpos[0] //layer[sLayer]->GetX()
2509 <<"X1=" << xpos[1] //layer[sLayer + 1]->GetX()
2510 <<"X2=" << xpos[2] //layer[sLayer + 2]->GetX()
2511 <<"X3=" << xpos[3] //layer[sLayer + 3]->GetX()
2512 <<"yref0=" << yref[0]
2513 <<"yref1=" << yref[1]
2514 <<"yref2=" << yref[2]
2515 <<"yref3=" << yref[3]
2516 <<"c0.=" << c[0]
2517 <<"c1.=" << c[1]
2518 <<"c2.=" << c[2]
2519 <<"c3.=" << c[3]
2520 <<"Seed0.=" << &cseed[planes[0]]
2521 <<"Seed1.=" << &cseed[planes[1]]
2522 <<"Seed2.=" << &cseed[planes[2]]
2523 <<"Seed3.=" << &cseed[planes[3]]
2524 <<"RiemanFitter.=" << rim
2525 <<"\n";
2526 }
3a039a31 2527 if(chi2[0] > fReconstructor->GetRecoParam() ->GetChi2Z()/*7./(3. - sLayer)*//*iter*/){
91834b8d 2528// //AliInfo(Form("Failed chi2 filter on chi2Z [%f].", chi2[0]));
d611c74f 2529 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2530 continue;
2531 }
3a039a31 2532 if(chi2[1] > fReconstructor->GetRecoParam() ->GetChi2Y()/*1./(3. - sLayer)*//*iter*/){
91834b8d 2533// //AliInfo(Form("Failed chi2 filter on chi2Y [%f].", chi2[1]));
d611c74f 2534 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2535 continue;
2536 }
2537 //AliInfo("Passed chi2 filter.");
2538
2539 // try attaching clusters to tracklets
d611c74f 2540 Int_t mlayers = 0;
be24510a 2541 for(int iLayer=0; iLayer<kNSeedPlanes; iLayer++){
d611c74f 2542 Int_t jLayer = planes[iLayer];
f29f13a6 2543 if(!cseed[jLayer].AttachClusters(stack[jLayer], kTRUE)) continue;
2544 cseed[jLayer].UpdateUsed();
2545 if(!cseed[jLayer].IsOK()) continue;
d611c74f 2546 mlayers++;
2547 }
be24510a 2548
2549 if(mlayers < kNSeedPlanes){
2550 //AliInfo(Form("Failed updating all seeds %d [%d].", mlayers, kNSeedPlanes));
2551 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2552 continue;
2553 }
2554
2555 // temporary exit door for the HLT
4302c900 2556 if(fReconstructor->IsHLT()){
be24510a 2557 // attach clusters to extrapolation chambers
2558 for(int iLayer=0; iLayer<kNPlanes-kNSeedPlanes; iLayer++){
2559 Int_t jLayer = planesExt[iLayer];
2560 if(!(chamber = stack[jLayer])) continue;
f29f13a6 2561 cseed[jLayer].AttachClusters(chamber, kTRUE);
be24510a 2562 }
4302c900 2563 fTrackQuality[ntracks] = 1.; // dummy value
2564 ntracks++;
218ba867 2565 if(ntracks == kMaxTracksStack) return ntracks;
4302c900 2566 cseed += 6;
2567 continue;
2568 }
2569
be24510a 2570
f29f13a6 2571 // Update Seeds and calculate Likelihood
d611c74f 2572 // fit tracklets and cook likelihood
f29f13a6 2573 FitTiltedRieman(&cseed[0], kTRUE);
2574 for(int iLayer=0; iLayer<kNSeedPlanes; iLayer++){
2575 Int_t jLayer = planes[iLayer];
2576 cseed[jLayer].Fit(kTRUE);
2577 }
91834b8d 2578 Double_t like = CookLikelihood(&cseed[0], planes); // to be checked
d611c74f 2579
3a039a31 2580 if (TMath::Log(1.E-9 + like) < fReconstructor->GetRecoParam() ->GetTrackLikelihood()){
d611c74f 2581 //AliInfo(Form("Failed likelihood %f[%e].", TMath::Log(1.E-9 + like), like));
2582 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2583 continue;
2584 }
2585 //AliInfo(Form("Passed likelihood %f[%e].", TMath::Log(1.E-9 + like), like));
2586
2587 // book preliminary results
2588 seedQuality[ntracks] = like;
2589 fSeedLayer[ntracks] = config;/*sLayer;*/
2590
2591 // attach clusters to the extrapolation seeds
be24510a 2592 for(int iLayer=0; iLayer<kNPlanes-kNSeedPlanes; iLayer++){
2593 Int_t jLayer = planesExt[iLayer];
d611c74f 2594 if(!(chamber = stack[jLayer])) continue;
d611c74f 2595
2596 // fit extrapolated seed
2597 if ((jLayer == 0) && !(cseed[1].IsOK())) continue;
2598 if ((jLayer == 5) && !(cseed[4].IsOK())) continue;
2599 AliTRDseedV1 pseed = cseed[jLayer];
f29f13a6 2600 if(!pseed.AttachClusters(chamber, kTRUE)) continue;
2601 pseed.Fit(kTRUE);
d611c74f 2602 cseed[jLayer] = pseed;
d611c74f 2603 FitTiltedRieman(cseed, kTRUE);
f29f13a6 2604 cseed[jLayer].Fit(kTRUE);
d611c74f 2605 }
2606
2607 // AliInfo("Extrapolation done.");
2608 // Debug Stream containing all the 6 tracklets
3a039a31 2609 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){
29f95561 2610 TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
d611c74f 2611 TLinearFitter *tiltedRieman = GetTiltedRiemanFitter();
2612 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2613 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2614 cstreamer << "MakeSeeds1"
2615 << "EventNumber=" << eventNumber
2616 << "CandidateNumber=" << candidateNumber
2617 << "S0.=" << &cseed[0]
2618 << "S1.=" << &cseed[1]
2619 << "S2.=" << &cseed[2]
2620 << "S3.=" << &cseed[3]
2621 << "S4.=" << &cseed[4]
2622 << "S5.=" << &cseed[5]
2623 << "FitterT.=" << tiltedRieman
2624 << "\n";
2625 }
2626
b72f4eaf 2627 if(fReconstructor->HasImproveTracklets() && ImproveSeedQuality(stack, cseed) < 4){
d611c74f 2628 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2629 continue;
2630 }
2631 //AliInfo("Improve seed quality done.");
2632
2633 // fit full track and cook likelihoods
2634 // Double_t curv = FitRieman(&cseed[0], chi2);
2635 // Double_t chi2ZF = chi2[0] / TMath::Max((mlayers - 3.), 1.);
2636 // Double_t chi2RF = chi2[1] / TMath::Max((mlayers - 3.), 1.);
2637
2638 // do the final track fitting (Once with vertex constraint and once without vertex constraint)
2639 Double_t chi2Vals[3];
2640 chi2Vals[0] = FitTiltedRieman(&cseed[0], kFALSE);
b72f4eaf 2641 if(fReconstructor->HasVertexConstrained())
d611c74f 2642 chi2Vals[1] = FitTiltedRiemanConstraint(&cseed[0], GetZ()); // Do Vertex Constrained fit if desired
2643 else
2644 chi2Vals[1] = 1.;
2645 chi2Vals[2] = GetChi2Z(&cseed[0]) / TMath::Max((mlayers - 3.), 1.);
2646 // Chi2 definitions in testing stage
2647 //chi2Vals[2] = GetChi2ZTest(&cseed[0]);
2648 fTrackQuality[ntracks] = CalculateTrackLikelihood(&cseed[0], &chi2Vals[0]);
2649 //AliInfo("Hyperplane fit done\n");
fac58f00 2650
3a039a31 2651 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){
29f95561 2652 TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
d611c74f 2653 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2654 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2655 TLinearFitter *fitterTC = GetTiltedRiemanFitterConstraint();
2656 TLinearFitter *fitterT = GetTiltedRiemanFitter();
91834b8d 2657 Int_t ncls = 0;
2658 for(Int_t iseed = 0; iseed < kNPlanes; iseed++){
2659 ncls += cseed[iseed].IsOK() ? cseed[iseed].GetN2() : 0;
2660 }
d611c74f 2661 cstreamer << "MakeSeeds2"
2662 << "EventNumber=" << eventNumber
2663 << "CandidateNumber=" << candidateNumber
2664 << "Chi2TR=" << chi2Vals[0]
2665 << "Chi2TC=" << chi2Vals[1]
2666 << "Nlayers=" << mlayers
91834b8d 2667 << "NClusters=" << ncls
d611c74f 2668 << "Like=" << like
2669 << "S0.=" << &cseed[0]
2670 << "S1.=" << &cseed[1]
2671 << "S2.=" << &cseed[2]
2672 << "S3.=" << &cseed[3]
2673 << "S4.=" << &cseed[4]
2674 << "S5.=" << &cseed[5]
d611c74f 2675 << "FitterT.=" << fitterT
2676 << "FitterTC.=" << fitterTC
2677 << "\n";
2678 }
2679
2680 ntracks++;
2681 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2682 if(ntracks == kMaxTracksStack){
2683 AliWarning(Form("Number of seeds reached maximum allowed (%d) in stack.", kMaxTracksStack));
2684 return ntracks;
2685 }
2686 cseed += 6;
41702fec 2687 }
2688 }
2689 }
41702fec 2690
2691 return ntracks;
e4f2f73d 2692}
2693
2694//_____________________________________________________________________________
0906e73e 2695AliTRDtrackV1* AliTRDtrackerV1::MakeTrack(AliTRDseedV1 *seeds, Double_t *params)
e4f2f73d 2696{
41702fec 2697 //
2698 // Build a TRD track out of tracklet candidates
2699 //
2700 // Parameters :
2701 // seeds : array of tracklets
2702 // params : track parameters (see MakeSeeds() function body for a detailed description)
2703 //
2704 // Output :
2705 // The TRD track.
2706 //
2707 // Detailed description
2708 //
2709 // To be discussed with Marian !!
2710 //
2711
41702fec 2712
2713 Double_t alpha = AliTRDgeometry::GetAlpha();
2714 Double_t shift = AliTRDgeometry::GetAlpha()/2.0;
2715 Double_t c[15];
2716
2717 c[ 0] = 0.2;
2718 c[ 1] = 0.0; c[ 2] = 2.0;
2719 c[ 3] = 0.0; c[ 4] = 0.0; c[ 5] = 0.02;
2720 c[ 6] = 0.0; c[ 7] = 0.0; c[ 8] = 0.0; c[ 9] = 0.1;
2721 c[10] = 0.0; c[11] = 0.0; c[12] = 0.0; c[13] = 0.0; c[14] = params[5]*params[5]*0.01;
2722
d20df6fc 2723 AliTRDtrackV1 track(seeds, &params[1], c, params[0], params[6]*alpha+shift);
2724 track.PropagateTo(params[0]-5.0);
f29f13a6 2725 AliTRDseedV1 *ptrTracklet = 0x0;
2726 // Sign clusters
2727 for (Int_t jLayer = 0; jLayer < AliTRDgeometry::kNlayer; jLayer++) {
2728 ptrTracklet = &seeds[jLayer];
2729 if(!ptrTracklet->IsOK()) continue;
2730 if(TMath::Abs(ptrTracklet->GetYref(1) - ptrTracklet->GetYfit(1)) >= .2) continue; // check this condition with Marian
2731 }
2732 //
91834b8d 2733 if(fReconstructor->IsHLT()){
91834b8d 2734 for(Int_t ip=0; ip<kNPlanes; ip++){
2735 track.UnsetTracklet(ip);
2736 ptrTracklet = SetTracklet(&seeds[ip]);
f29f13a6 2737 ptrTracklet->UseClusters();
91834b8d 2738 track.SetTracklet(ptrTracklet, fTracklets->GetEntriesFast()-1);
2739 }
d78d7df0 2740 AliTRDtrackV1 *ptrTrack = SetTrack(&track);
2741 ptrTrack->SetReconstructor(fReconstructor);
2742 return ptrTrack;
91834b8d 2743 }
393fda1c 2744
d20df6fc 2745 track.ResetCovariance(1);
e79f8eb0 2746 Int_t nc = TMath::Abs(FollowBackProlongation(track));
393fda1c 2747 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 5){
2748 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2749 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2750 Double_t p[5]; // Track Params for the Debug Stream
2751 track.GetExternalParameters(params[0], p);
29f95561 2752 TTreeSRedirector &cs = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
393fda1c 2753 cs << "MakeTrack"
2754 << "EventNumber=" << eventNumber
2755 << "CandidateNumber=" << candidateNumber
2756 << "nc=" << nc
2757 << "X=" << params[0]
2758 << "Y=" << p[0]
2759 << "Z=" << p[1]
2760 << "snp=" << p[2]
2761 << "tnd=" << p[3]
2762 << "crv=" << p[4]
2763 << "Yin=" << params[1]
2764 << "Zin=" << params[2]
2765 << "snpin=" << params[3]
2766 << "tndin=" << params[4]
2767 << "crvin=" << params[5]
2768 << "track.=" << &track
2769 << "\n";
2770 }
d20df6fc 2771 if (nc < 30) return 0x0;
2772
2773 AliTRDtrackV1 *ptrTrack = SetTrack(&track);
215f7116 2774 ptrTrack->SetReconstructor(fReconstructor);
48f8adf3 2775 ptrTrack->CookLabel(.9);
24253b0a 2776
d20df6fc 2777 // computes PID for track
2778 ptrTrack->CookPID();
2779 // update calibration references using this track
48f8adf3 2780 AliTRDCalibraFillHisto *calibra = AliTRDCalibraFillHisto::Instance();
2781 if (!calibra){
2782 AliInfo("Could not get Calibra instance\n");
2783 if(calibra->GetHisto2d()) calibra->UpdateHistogramsV1(ptrTrack);
2784 }
d20df6fc 2785 return ptrTrack;
e4f2f73d 2786}
2787
0906e73e 2788
e4f2f73d 2789//____________________________________________________________________
eb38ed55 2790Int_t AliTRDtrackerV1::ImproveSeedQuality(AliTRDtrackingChamber **stack, AliTRDseedV1 *cseed)
e4f2f73d 2791{
41702fec 2792 //
2793 // Sort tracklets according to "quality" and try to "improve" the first 4 worst
2794 //
2795 // Parameters :
2796 // layers : Array of propagation layers for a stack/supermodule
2797 // cseed : Array of 6 seeding tracklets which has to be improved
2798 //
f29f13a6 2799 // Output :
41702fec 2800 // cssed : Improved seeds
2801 //
2802 // Detailed description
2803 //
2804 // Iterative procedure in which new clusters are searched for each
2805 // tracklet seed such that the seed quality (see AliTRDseed::GetQuality())
2806 // can be maximized. If some optimization is found the old seeds are replaced.
2807 //
2808 // debug level: 7
2809 //
2810
2811 // make a local working copy
2812 AliTRDtrackingChamber *chamber = 0x0;
2813 AliTRDseedV1 bseed[6];
2814 Int_t nLayers = 0;
2815 for (Int_t jLayer = 0; jLayer < 6; jLayer++) bseed[jLayer] = cseed[jLayer];
2816
2817 Float_t lastquality = 10000.0;
2818 Float_t lastchi2 = 10000.0;
2819 Float_t chi2 = 1000.0;
2820
2821 for (Int_t iter = 0; iter < 4; iter++) {
2822 Float_t sumquality = 0.0;
2823 Float_t squality[6];
2824 Int_t sortindexes[6];
2825
2826 for (Int_t jLayer = 0; jLayer < 6; jLayer++) {
3a039a31 2827 squality[jLayer] = bseed[jLayer].IsOK() ? bseed[jLayer].GetQuality(kTRUE) : 1000.;
41702fec 2828 sumquality += squality[jLayer];
2829 }
2830 if ((sumquality >= lastquality) || (chi2 > lastchi2)) break;
2831
2832 nLayers = 0;
2833 lastquality = sumquality;
2834 lastchi2 = chi2;
2835 if (iter > 0) for (Int_t jLayer = 0; jLayer < 6; jLayer++) cseed[jLayer] = bseed[jLayer];
2836
2837 TMath::Sort(6, squality, sortindexes, kFALSE);
2838 for (Int_t jLayer = 5; jLayer > 1; jLayer--) {
2839 Int_t bLayer = sortindexes[jLayer];
2840 if(!(chamber = stack[bLayer])) continue;
f29f13a6 2841 bseed[bLayer].AttachClusters(chamber, kTRUE);
2842 bseed[bLayer].Fit(kTRUE);
41702fec 2843 if(bseed[bLayer].IsOK()) nLayers++;
2844 }
2845
2846 chi2 = FitTiltedRieman(bseed, kTRUE);
3a039a31 2847 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 7){
41702fec 2848 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2849 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2850 TLinearFitter *tiltedRieman = GetTiltedRiemanFitter();
29f95561 2851 TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
41702fec 2852 cstreamer << "ImproveSeedQuality"
2853 << "EventNumber=" << eventNumber
2854 << "CandidateNumber=" << candidateNumber
2855 << "Iteration=" << iter
2856 << "S0.=" << &bseed[0]
2857 << "S1.=" << &bseed[1]
2858 << "S2.=" << &bseed[2]
2859 << "S3.=" << &bseed[3]
2860 << "S4.=" << &bseed[4]
2861 << "S5.=" << &bseed[5]
2862 << "FitterT.=" << tiltedRieman
2863 << "\n";
2864 }
2865 } // Loop: iter
41702fec 2866 // we are sure that at least 2 tracklets are OK !
2867 return nLayers+2;
e4f2f73d 2868}
2869
eb38ed55 2870//_________________________________________________________________________
2871Double_t AliTRDtrackerV1::CalculateTrackLikelihood(AliTRDseedV1 *tracklets, Double_t *chi2){
41702fec 2872 //
2873 // Calculates the Track Likelihood value. This parameter serves as main quality criterion for
2874 // the track selection
2875 // The likelihood value containes:
2876 // - The chi2 values from the both fitters and the chi2 values in z-direction from a linear fit
2877 // - The Sum of the Parameter |slope_ref - slope_fit|/Sigma of the tracklets
2878 // For all Parameters an exponential dependency is used
2879 //
2880 // Parameters: - Array of tracklets (AliTRDseedV1) related to the track candidate
2881 // - Array of chi2 values:
2882 // * Non-Constrained Tilted Riemann fit
2883 // * Vertex-Constrained Tilted Riemann fit
2884 // * z-Direction from Linear fit
2885 // Output: - The calculated track likelihood
2886 //
2887 // debug level 2
2888 //
2889
f29f13a6 2890 Double_t chi2phi = 0, nLayers = 0;
41702fec 2891 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
2892 if(!tracklets[iLayer].IsOK()) continue;
f29f13a6 2893 chi2phi += tracklets[iLayer].GetChi2Phi();
41702fec 2894 nLayers++;
2895 }
f29f13a6 2896 chi2phi /= Float_t (nLayers - 2.0);
41702fec 2897
2898 Double_t likeChi2Z = TMath::Exp(-chi2[2] * 0.14); // Chi2Z
b72f4eaf 2899 Double_t likeChi2TC = (fReconstructor->HasVertexConstrained()) ?
d20df6fc 2900 TMath::Exp(-chi2[1] * 0.677) : 1; // Constrained Tilted Riemann
41702fec 2901 Double_t likeChi2TR = TMath::Exp(-chi2[0] * 0.78); // Non-constrained Tilted Riemann
f29f13a6 2902 Double_t likeChi2Phi= TMath::Exp(-chi2phi * 3.23);
2903 Double_t trackLikelihood = likeChi2Z * likeChi2TR * likeChi2Phi;
41702fec 2904
3a039a31 2905 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){
41702fec 2906 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2907 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
29f95561 2908 TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
41702fec 2909 cstreamer << "CalculateTrackLikelihood0"
2910 << "EventNumber=" << eventNumber
2911 << "CandidateNumber=" << candidateNumber
2912 << "LikeChi2Z=" << likeChi2Z
2913 << "LikeChi2TR=" << likeChi2TR
2914 << "LikeChi2TC=" << likeChi2TC
f29f13a6 2915 << "LikeChi2Phi=" << likeChi2Phi
41702fec 2916 << "TrackLikelihood=" << trackLikelihood
2917 << "\n";
2918 }
2919
2920 return trackLikelihood;
e4f2f73d 2921}
2922
2923//____________________________________________________________________
91834b8d 2924Double_t AliTRDtrackerV1::CookLikelihood(AliTRDseedV1 *cseed, Int_t planes[4])
e4f2f73d 2925{
41702fec 2926 //
2927 // Calculate the probability of this track candidate.
2928 //
2929 // Parameters :
2930 // cseeds : array of candidate tracklets
2931 // planes : array of seeding planes (see seeding configuration)
2932 // chi2 : chi2 values (on the Z and Y direction) from the rieman fit of the track.
2933 //
2934 // Output :
2935 // likelihood value
2936 //
2937 // Detailed description
2938 //
2939 // The track quality is estimated based on the following 4 criteria:
2940 // 1. precision of the rieman fit on the Y direction (likea)
2941 // 2. chi2 on the Y direction (likechi2y)
2942 // 3. chi2 on the Z direction (likechi2z)
2943 // 4. number of attached clusters compared to a reference value
2944 // (see AliTRDrecoParam::fkFindable) (likeN)
2945 //
2946 // The distributions for each type of probabilities are given below as of
2947 // (date). They have to be checked to assure consistency of estimation.
2948 //
2949
2950 // ratio of the total number of clusters/track which are expected to be found by the tracker.
91834b8d 2951 const AliTRDrecoParam *fRecoPars = fReconstructor->GetRecoParam();
41702fec 2952
91834b8d 2953 Double_t chi2y = GetChi2Y(&cseed[0]);
2954 Double_t chi2z = GetChi2Z(&cseed[0]);
2955
8ae98148 2956 Float_t nclusters = 0.;
41702fec 2957 Double_t sumda = 0.;
2958 for(UChar_t ilayer = 0; ilayer < 4; ilayer++){
2959 Int_t jlayer = planes[ilayer];
2960 nclusters += cseed[jlayer].GetN2();
e3cf3d02 2961 sumda += TMath::Abs(cseed[jlayer].GetYfit(1) - cseed[jlayer].GetYref(1));
41702fec 2962 }
8ae98148 2963 nclusters *= .25;
2964
5a2e200c 2965 Double_t likea = TMath::Exp(-sumda * fRecoPars->GetPhiSlope());
41702fec 2966 Double_t likechi2y = 0.0000000001;
5a2e200c 2967 if (fReconstructor->IsCosmic() || chi2y < fRecoPars->GetChi2YCut()) likechi2y += TMath::Exp(-TMath::Sqrt(chi2y) * fRecoPars->GetChi2YSlope());
2968 Double_t likechi2z = TMath::Exp(-chi2z * fRecoPars->GetChi2ZSlope());
8ae98148 2969 Double_t likeN = TMath::Exp(-(fRecoPars->GetNMeanClusters() - nclusters) / fRecoPars->GetNSigmaClusters());
41702fec 2970 Double_t like = likea * likechi2y * likechi2z * likeN;
2971
2972 // 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 2973 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){
41702fec 2974 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2975 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
91834b8d 2976 Int_t nTracklets = 0; Float_t mean_ncls = 0;
2977 for(Int_t iseed=0; iseed < kNPlanes; iseed++){
2978 if(!cseed[iseed].IsOK()) continue;
2979 nTracklets++;
2980 mean_ncls += cseed[iseed].GetN2();
2981 }
2982 if(nTracklets) mean_ncls /= nTracklets;
41702fec 2983 // The Debug Stream contains the seed
29f95561 2984 TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
41702fec 2985 cstreamer << "CookLikelihood"
2986 << "EventNumber=" << eventNumber
2987 << "CandidateNumber=" << candidateNumber
2988 << "tracklet0.=" << &cseed[0]
2989 << "tracklet1.=" << &cseed[1]
2990 << "tracklet2.=" << &cseed[2]
2991 << "tracklet3.=" << &cseed[3]
2992 << "tracklet4.=" << &cseed[4]
2993 << "tracklet5.=" << &cseed[5]
2994 << "sumda=" << sumda
91834b8d 2995 << "chi2y=" << chi2y
2996 << "chi2z=" << chi2z
41702fec 2997 << "likea=" << likea
2998 << "likechi2y=" << likechi2y
2999 << "likechi2z=" << likechi2z
3000 << "nclusters=" << nclusters
3001 << "likeN=" << likeN
3002 << "like=" << like
91834b8d 3003 << "meanncls=" << mean_ncls
41702fec 3004 << "\n";
3005 }
3006
3007 return like;
e4f2f73d 3008}
3009
e4f2f73d 3010//____________________________________________________________________
0906e73e 3011void AliTRDtrackerV1::GetSeedingConfig(Int_t iconfig, Int_t planes[4])
e4f2f73d 3012{
41702fec 3013 //
3014 // Map seeding configurations to detector planes.
3015 //
3016 // Parameters :
3017 // iconfig : configuration index
3018 // planes : member planes of this configuration. On input empty.
3019 //
3020 // Output :
3021 // planes : contains the planes which are defining the configuration
3022 //
3023 // Detailed description
3024 //
3025 // Here is the list of seeding planes configurations together with
3026 // their topological classification:
3027 //
3028 // 0 - 5432 TQ 0
3029 // 1 - 4321 TQ 0
3030 // 2 - 3210 TQ 0
3031 // 3 - 5321 TQ 1
3032 // 4 - 4210 TQ 1
3033 // 5 - 5431 TQ 1
3034 // 6 - 4320 TQ 1
3035 // 7 - 5430 TQ 2
3036 // 8 - 5210 TQ 2
3037 // 9 - 5421 TQ 3
3038 // 10 - 4310 TQ 3
3039 // 11 - 5410 TQ 4
3040 // 12 - 5420 TQ 5
3041 // 13 - 5320 TQ 5
3042 // 14 - 5310 TQ 5
3043 //
3044 // The topologic quality is modeled as follows:
3045 // 1. The general model is define by the equation:
3046 // p(conf) = exp(-conf/2)
3047 // 2. According to the topologic classification, configurations from the same
3048 // class are assigned the agerage value over the model values.
3049 // 3. Quality values are normalized.
3050 //
3051 // The topologic quality distribution as function of configuration is given below:
3052 //Begin_Html
3053 // <img src="gif/topologicQA.gif">
3054 //End_Html
3055 //
3056
3057 switch(iconfig){
3058 case 0: // 5432 TQ 0
3059 planes[0] = 2;
3060 planes[1] = 3;
3061 planes[2] = 4;
3062 planes[3] = 5;
3063 break;
3064 case 1: // 4321 TQ 0
3065 planes[0] = 1;
3066 planes[1] = 2;
3067 planes[2] = 3;
3068 planes[3] = 4;
3069 break;
3070 case 2: // 3210 TQ 0
3071 planes[0] = 0;
3072 planes[1] = 1;
3073 planes[2] = 2;
3074 planes[3] = 3;
3075 break;
3076 case 3: // 5321 TQ 1
3077 planes[0] = 1;
3078 planes[1] = 2;
3079 planes[2] = 3;
3080 planes[3] = 5;
3081 break;
3082 case 4: // 4210 TQ 1
3083 planes[0] = 0;
3084 planes[1] = 1;
3085 planes[2] = 2;
3086 planes[3] = 4;
3087 break;
3088 case 5: // 5431 TQ 1
3089 planes[0] = 1;
3090 planes[1] = 3;
3091 planes[2] = 4;
3092 planes[3] = 5;
3093 break;
3094 case 6: // 4320 TQ 1
3095 planes[0] = 0;
3096 planes[1] = 2;
3097 planes[2] = 3;
3098 planes[3] = 4;
3099 break;
3100 case 7: // 5430 TQ 2
3101 planes[0] = 0;
3102 planes[1] = 3;
3103 planes[2] = 4;
3104 planes[3] = 5;
3105 break;
3106 case 8: // 5210 TQ 2
3107 planes[0] = 0;
3108 planes[1] = 1;
3109 planes[2] = 2;
3110 planes[3] = 5;
3111 break;
3112 case 9: // 5421 TQ 3
3113 planes[0] = 1;
3114 planes[1] = 2;
3115 planes[2] = 4;
3116 planes[3] = 5;
3117 break;
3118 case 10: // 4310 TQ 3
3119 planes[0] = 0;
3120 planes[1] = 1;
3121 planes[2] = 3;
3122 planes[3] = 4;
3123 break;
3124 case 11: // 5410 TQ 4
3125 planes[0] = 0;
3126 planes[1] = 1;
3127 planes[2] = 4;
3128 planes[3] = 5;
3129 break;
3130 case 12: // 5420 TQ 5
3131 planes[0] = 0;
3132 planes[1] = 2;
3133 planes[2] = 4;
3134 planes[3] = 5;
3135 break;
3136 case 13: // 5320 TQ 5
3137 planes[0] = 0;
3138 planes[1] = 2;
3139 planes[2] = 3;
3140 planes[3] = 5;
3141 break;
3142 case 14: // 5310 TQ 5
3143 planes[0] = 0;
3144 planes[1] = 1;
3145 planes[2] = 3;
3146 planes[3] = 5;
3147 break;
3148 }
e4f2f73d 3149}
3150
3151//____________________________________________________________________
0906e73e 3152void AliTRDtrackerV1::GetExtrapolationConfig(Int_t iconfig, Int_t planes[2])
e4f2f73d 3153{
41702fec 3154 //
3155 // Returns the extrapolation planes for a seeding configuration.
3156 //
3157 // Parameters :
3158 // iconfig : configuration index
3159 // planes : planes which are not in this configuration. On input empty.
3160 //
3161 // Output :
3162 // planes : contains the planes which are not in the configuration
3163 //
3164 // Detailed description
3165 //
3166
3167 switch(iconfig){
3168 case 0: // 5432 TQ 0
3169 planes[0] = 1;
3170 planes[1] = 0;
3171 break;
3172 case 1: // 4321 TQ 0
3173 planes[0] = 5;
3174 planes[1] = 0;
3175 break;
3176 case 2: // 3210 TQ 0
3177 planes[0] = 4;
3178 planes[1] = 5;
3179 break;
3180 case 3: // 5321 TQ 1
3181 planes[0] = 4;
3182 planes[1] = 0;
3183 break;
3184 case 4: // 4210 TQ 1
3185 planes[0] = 5;
3186 planes[1] = 3;
3187 break;
3188 case 5: // 5431 TQ 1
3189 planes[0] = 2;
3190 planes[1] = 0;
3191 break;
3192 case 6: // 4320 TQ 1
3193 planes[0] = 5;
3194 planes[1] = 1;
3195 break;
3196 case 7: // 5430 TQ 2
3197 planes[0] = 2;
3198 planes[1] = 1;
3199 break;
3200 case 8: // 5210 TQ 2
3201 planes[0] = 4;
3202 planes[1] = 3;
3203 break;
3204 case 9: // 5421 TQ 3
3205 planes[0] = 3;
3206 planes[1] = 0;
3207 break;
3208 case 10: // 4310 TQ 3
3209 planes[0] = 5;
3210 planes[1] = 2;
3211 break;
3212 case 11: // 5410 TQ 4
3213 planes[0] = 3;
3214 planes[1] = 2;
3215 break;
3216 case 12: // 5420 TQ 5
3217 planes[0] = 3;
3218 planes[1] = 1;
3219 break;
3220 case 13: // 5320 TQ 5
3221 planes[0] = 4;
3222 planes[1] = 1;
3223 break;
3224 case 14: // 5310 TQ 5
3225 planes[0] = 4;
3226 planes[1] = 2;
3227 break;
3228 }
e4f2f73d 3229}
eb38ed55 3230
3231//____________________________________________________________________
3232AliCluster* AliTRDtrackerV1::GetCluster(Int_t idx) const
3233{
41702fec 3234 Int_t ncls = fClusters->GetEntriesFast();
2f7514a6 3235 return idx >= 0 && idx < ncls ? (AliCluster*)fClusters->UncheckedAt(idx) : 0x0;
eb38ed55 3236}
3237
3b57a3f7 3238//____________________________________________________________________
3239AliTRDseedV1* AliTRDtrackerV1::GetTracklet(Int_t idx) const
3240{
41702fec 3241 Int_t ntrklt = fTracklets->GetEntriesFast();
2f7514a6 3242 return idx >= 0 && idx < ntrklt ? (AliTRDseedV1*)fTracklets->UncheckedAt(idx) : 0x0;
3b57a3f7 3243}
3244
3245//____________________________________________________________________
3246AliKalmanTrack* AliTRDtrackerV1::GetTrack(Int_t idx) const
3247{
41702fec 3248 Int_t ntrk = fTracks->GetEntriesFast();
2f7514a6 3249 return idx >= 0 && idx < ntrk ? (AliKalmanTrack*)fTracks->UncheckedAt(idx) : 0x0;
3b57a3f7 3250}
3251
bb56afff 3252//____________________________________________________________________
3253Float_t AliTRDtrackerV1::CalculateReferenceX(AliTRDseedV1 *tracklets){
41702fec 3254 //
3255 // Calculates the reference x-position for the tilted Rieman fit defined as middle
3256 // of the stack (middle between layers 2 and 3). For the calculation all the tracklets
3257 // are taken into account
3258 //
3259 // Parameters: - Array of tracklets(AliTRDseedV1)
3260 //
3261 // Output: - The reference x-position(Float_t)
3262 //
3263 Int_t nDistances = 0;
3264 Float_t meanDistance = 0.;
3265 Int_t startIndex = 5;
3266 for(Int_t il =5; il > 0; il--){
3267 if(tracklets[il].IsOK() && tracklets[il -1].IsOK()){
3268 Float_t xdiff = tracklets[il].GetX0() - tracklets[il -1].GetX0();
3269 meanDistance += xdiff;
3270 nDistances++;
3271 }
3272 if(tracklets[il].IsOK()) startIndex = il;
3273 }
3274 if(tracklets[0].IsOK()) startIndex = 0;
3275 if(!nDistances){
3276 // We should normally never get here
3277 Float_t xpos[2]; memset(xpos, 0, sizeof(Float_t) * 2);
3278 Int_t iok = 0, idiff = 0;
3279 // This attempt is worse and should be avoided:
3280 // check for two chambers which are OK and repeat this without taking the mean value
3281 // Strategy avoids a division by 0;
3282 for(Int_t il = 5; il >= 0; il--){
3283 if(tracklets[il].IsOK()){
3284 xpos[iok] = tracklets[il].GetX0();
3285 iok++;
3286 startIndex = il;
3287 }
3288 if(iok) idiff++; // to get the right difference;
3289 if(iok > 1) break;
3290 }
3291 if(iok > 1){
3292 meanDistance = (xpos[0] - xpos[1])/idiff;
3293 }
3294 else{
3295 // we have do not even have 2 layers which are OK? The we do not need to fit at all
3296 return 331.;
3297 }
3298 }
3299 else{
3300 meanDistance /= nDistances;
3301 }
3302 return tracklets[startIndex].GetX0() + (2.5 - startIndex) * meanDistance - 0.5 * (AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick());
bb56afff 3303}
eb38ed55 3304
fac58f00 3305// //_____________________________________________________________________________
3306// Int_t AliTRDtrackerV1::Freq(Int_t n, const Int_t *inlist
3307// , Int_t *outlist, Bool_t down)
3308// {
3309// //
3310// // Sort eleements according occurancy
3311// // The size of output array has is 2*n
3312// //
3313//
3314// if (n <= 0) {
3315// return 0;
3316// }
3317//
3318// Int_t *sindexS = new Int_t[n]; // Temporary array for sorting
3319// Int_t *sindexF = new Int_t[2*n];
3320// for (Int_t i = 0; i < n; i++) {
3321// sindexF[i] = 0;
3322// }
3323//
3324// TMath::Sort(n,inlist,sindexS,down);
3325//
3326// Int_t last = inlist[sindexS[0]];
3327// Int_t val = last;
3328// sindexF[0] = 1;
3329// sindexF[0+n] = last;
3330// Int_t countPos = 0;
3331//
3332// // Find frequency
3333// for (Int_t i = 1; i < n; i++) {
3334// val = inlist[sindexS[i]];
3335// if (last == val) {
3336// sindexF[countPos]++;
3337// }
3338// else {
3339// countPos++;
3340// sindexF[countPos+n] = val;
3341// sindexF[countPos]++;
3342// last = val;
3343// }
3344// }
3345// if (last == val) {
3346// countPos++;
3347// }
3348//
3349// // Sort according frequency
3350// TMath::Sort(countPos,sindexF,sindexS,kTRUE);
3351//
3352// for (Int_t i = 0; i < countPos; i++) {
3353// outlist[2*i ] = sindexF[sindexS[i]+n];
3354// outlist[2*i+1] = sindexF[sindexS[i]];
3355// }
3356//
3357// delete [] sindexS;
3358// delete [] sindexF;
3359//
3360// return countPos;
3361//
3362// }
bb56afff 3363
06b32d95 3364
d611c74f 3365//____________________________________________________________________
3366void AliTRDtrackerV1::ResetSeedTB()
3367{
3368// reset buffer for seeding time bin layers. If the time bin
3369// layers are not allocated this function allocates them
3370
3371 for(Int_t isl=0; isl<kNSeedPlanes; isl++){
3372 if(!fSeedTB[isl]) fSeedTB[isl] = new AliTRDchamberTimeBin();
3373 else fSeedTB[isl]->Clear();
3374 }
3375}
3376
e3cf3d02 3377
3378//_____________________________________________________________________________
3379Float_t AliTRDtrackerV1::GetChi2Y(AliTRDseedV1 *tracklets) const
3380{
3381 // Calculates normalized chi2 in y-direction
3382 // chi2 = Sum chi2 / n_tracklets
3383
3384 Double_t chi2 = 0.; Int_t n = 0;
3385 for(Int_t ipl = kNPlanes; ipl--;){
3386 if(!tracklets[ipl].IsOK()) continue;
3387 chi2 += tracklets[ipl].GetChi2Y();
3388 n++;
3389 }
3390 return n ? chi2/n : 0.;
3391}
3392
bb56afff 3393//_____________________________________________________________________________
3394Float_t AliTRDtrackerV1::GetChi2Z(AliTRDseedV1 *tracklets) const
3395{
91834b8d 3396 // Calculates normalized chi2 in z-direction
e3cf3d02 3397 // chi2 = Sum chi2 / n_tracklets
41702fec 3398
e3cf3d02 3399 Double_t chi2 = 0; Int_t n = 0;
3400 for(Int_t ipl = kNPlanes; ipl--;){
41702fec 3401 if(!tracklets[ipl].IsOK()) continue;
e3cf3d02 3402 chi2 += tracklets[ipl].GetChi2Z();
3403 n++;
41702fec 3404 }
e3cf3d02 3405 return n ? chi2/n : 0.;
bb56afff 3406}
8acca6a3 3407
3408///////////////////////////////////////////////////////
3409// //
3410// Resources of class AliTRDLeastSquare //
3411// //
3412///////////////////////////////////////////////////////
3413
3414//_____________________________________________________________________________
3415AliTRDtrackerV1::AliTRDLeastSquare::AliTRDLeastSquare(){
41702fec 3416 //
3417 // Constructor of the nested class AliTRDtrackFitterLeastSquare
3418 //
3419 memset(fParams, 0, sizeof(Double_t) * 2);
3420 memset(fSums, 0, sizeof(Double_t) * 5);
3421 memset(fCovarianceMatrix, 0, sizeof(Double_t) * 3);
8acca6a3 3422
3423}
3424
3425//_____________________________________________________________________________
3426void AliTRDtrackerV1::AliTRDLeastSquare::AddPoint(Double_t *x, Double_t y, Double_t sigmaY){
41702fec 3427 //
3428 // Adding Point to the fitter
3429 //
3430 Double_t weight = 1/(sigmaY * sigmaY);
3431 Double_t &xpt = *x;
3432 // printf("Adding point x = %f, y = %f, sigma = %f\n", xpt, y, sigmaY);
3433 fSums[0] += weight;
3434 fSums[1] += weight * xpt;
3435 fSums[2] += weight * y;
3436 fSums[3] += weight * xpt * y;
3437 fSums[4] += weight * xpt * xpt;
3438 fSums[5] += weight * y * y;
8acca6a3 3439}
3440
3441//_____________________________________________________________________________
3442void AliTRDtrackerV1::AliTRDLeastSquare::RemovePoint(Double_t *x, Double_t y, Double_t sigmaY){
41702fec 3443 //
3444 // Remove Point from the sample
3445 //
3446 Double_t weight = 1/(sigmaY * sigmaY);
3447 Double_t &xpt = *x;
3448 fSums[0] -= weight;
3449 fSums[1] -= weight * xpt;
3450 fSums[2] -= weight * y;
3451 fSums[3] -= weight * xpt * y;
3452 fSums[4] -= weight * xpt * xpt;
3453 fSums[5] -= weight * y * y;
8acca6a3 3454}
3455
3456//_____________________________________________________________________________
3457void AliTRDtrackerV1::AliTRDLeastSquare::Eval(){
41702fec 3458 //
3459 // Evaluation of the fit:
3460 // Calculation of the parameters
3461 // Calculation of the covariance matrix
3462 //
3463
3464 Double_t denominator = fSums[0] * fSums[4] - fSums[1] *fSums[1];
aec26713 3465 if(denominator==0) return;
3466
41702fec 3467 // for(Int_t isum = 0; isum < 5; isum++)
3468 // printf("fSums[%d] = %f\n", isum, fSums[isum]);
3469 // printf("denominator = %f\n", denominator);
3470 fParams[0] = (fSums[2] * fSums[4] - fSums[1] * fSums[3])/ denominator;
3471 fParams[1] = (fSums[0] * fSums[3] - fSums[1] * fSums[2]) / denominator;
3472 // printf("fParams[0] = %f, fParams[1] = %f\n", fParams[0], fParams[1]);
3473
3474 // Covariance matrix
3475 fCovarianceMatrix[0] = fSums[4] - fSums[1] * fSums[1] / fSums[0];
3476 fCovarianceMatrix[1] = fSums[5] - fSums[2] * fSums[2] / fSums[0];
3477 fCovarianceMatrix[2] = fSums[3] - fSums[1] * fSums[2] / fSums[0];
8acca6a3 3478}
3479
46b6abd7 3480//_____________________________________________________________________________
3481Double_t AliTRDtrackerV1::AliTRDLeastSquare::GetFunctionValue(Double_t *xpos) const {
41702fec 3482 //
3483 // Returns the Function value of the fitted function at a given x-position
3484 //
3485 return fParams[0] + fParams[1] * (*xpos);
46b6abd7 3486}
3487
3488//_____________________________________________________________________________
3489void AliTRDtrackerV1::AliTRDLeastSquare::GetCovarianceMatrix(Double_t *storage) const {
41702fec 3490 //
3491 // Copies the values of the covariance matrix into the storage
3492 //
3493 memcpy(storage, fCovarianceMatrix, sizeof(Double_t) * 3);
46b6abd7 3494}
3495