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From Christoph: add missing include.
[u/mrichter/AliRoot.git] / TRD / AliTRDtrackerV1.cxx
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e4f2f73d 1/**************************************************************************
972ef65e 2* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
3* *
4* Author: The ALICE Off-line Project. *
5* Contributors are mentioned in the code where appropriate. *
6* *
7* Permission to use, copy, modify and distribute this software and its *
8* documentation strictly for non-commercial purposes is hereby granted *
9* without fee, provided that the above copyright notice appears in all *
10* copies and that both the copyright notice and this permission notice *
11* appear in the supporting documentation. The authors make no claims *
12* about the suitability of this software for any purpose. It is *
13* provided "as is" without express or implied warranty. *
14**************************************************************************/
e4f2f73d 15
16/* $Id$ */
17
18///////////////////////////////////////////////////////////////////////////////
19// //
20// Track finder //
21// //
22// Authors: //
23// Alex Bercuci <A.Bercuci@gsi.de> //
24// Markus Fasel <M.Fasel@gsi.de> //
25// //
26///////////////////////////////////////////////////////////////////////////////
27
bb56afff 28// #include <Riostream.h>
29// #include <stdio.h>
30// #include <string.h>
e4f2f73d 31
32#include <TBranch.h>
bb56afff 33#include <TDirectory.h>
e4f2f73d 34#include <TLinearFitter.h>
e4f2f73d 35#include <TTree.h>
36#include <TClonesArray.h>
e4f2f73d 37#include <TTreeStream.h>
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] = {
6e39bde4 74 0.5112, 0.5112, 0.5112, 0.0786, 0.0786,
41702fec 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{
2a3191bb 259// Propagation of ESD tracks from TPC to TOF detectors and building of the TRD track. For building
260// a TRD track an ESD track is used as seed. The informations obtained on the TRD track (measured points,
261// covariance, PID, etc.) are than used to update the corresponding ESD track.
262// Each track seed is first propagated to the geometrical limit of the TRD detector.
263// Its prolongation is searched in the TRD and if corresponding clusters are found tracklets are
264// constructed out of them (see AliTRDseedV1::AttachClusters()) and the track is updated.
265// Otherwise the ESD track is left unchanged.
266//
267// The following steps are performed:
268// 1. Selection of tracks based on the variance in the y-z plane.
269// 2. Propagation to the geometrical limit of the TRD volume. If track propagation fails the AliESDtrack::kTRDStop is set.
270// 3. Prolongation inside the fiducial volume (see AliTRDtrackerV1::FollowBackProlongation()) and marking
271// the following status bits:
272// - AliESDtrack::kTRDin - if the tracks enters the TRD fiducial volume
273// - AliESDtrack::kTRDStop - if the tracks fails propagation
274// - AliESDtrack::kTRDbackup - if the tracks fulfills chi2 conditions and qualify for refitting
275// 4. Writting to friends, PID, MC label, quality etc. Setting status bit AliESDtrack::kTRDout.
276// 5. Propagation to TOF. If track propagation fails the AliESDtrack::kTRDStop is set.
277//
278
279 AliTRDCalibraFillHisto *calibra = AliTRDCalibraFillHisto::Instance(); // Calibration monitor
41702fec 280 if (!calibra) AliInfo("Could not get Calibra instance\n");
281
eb2b4f91 282 // Define scalers
283 Int_t nFound = 0, // number of tracks found
284 nSeeds = 0, // total number of ESD seeds
285 nTRDseeds= 0, // number of seeds in the TRD acceptance
286 nTPCseeds= 0; // number of TPC seeds
41702fec 287 Float_t foundMin = 20.0;
288
d611c74f 289 Float_t *quality = 0x0;
290 Int_t *index = 0x0;
eb2b4f91 291 nSeeds = event->GetNumberOfTracks();
292 // Sort tracks according to quality
293 // (covariance in the yz plane)
294 if(nSeeds){
295 quality = new Float_t[nSeeds];
296 index = new Int_t[nSeeds];
297 for (Int_t iSeed = nSeeds; iSeed--;) {
d611c74f 298 AliESDtrack *seed = event->GetTrack(iSeed);
299 Double_t covariance[15];
300 seed->GetExternalCovariance(covariance);
301 quality[iSeed] = covariance[0] + covariance[2];
302 }
eb2b4f91 303 TMath::Sort(nSeeds, quality, index,kFALSE);
41702fec 304 }
41702fec 305
eb2b4f91 306 // Propagate all seeds
41702fec 307 Int_t expectedClr;
308 AliTRDtrackV1 track;
eb2b4f91 309 for (Int_t iSeed = 0; iSeed < nSeeds; iSeed++) {
41702fec 310
311 // Get the seeds in sorted sequence
312 AliESDtrack *seed = event->GetTrack(index[iSeed]);
eb2b4f91 313 Float_t p4 = seed->GetC(seed->GetBz());
41702fec 314
315 // Check the seed status
316 ULong_t status = seed->GetStatus();
317 if ((status & AliESDtrack::kTPCout) == 0) continue;
318 if ((status & AliESDtrack::kTRDout) != 0) continue;
eb2b4f91 319
320 // Propagate to the entrance in the TRD mother volume
41702fec 321 new(&track) AliTRDtrackV1(*seed);
eb2b4f91 322 if(AliTRDgeometry::GetXtrdBeg() > (fgkMaxStep + track.GetX()) && !PropagateToX(track, AliTRDgeometry::GetXtrdBeg(), fgkMaxStep)){
323 seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
324 continue;
325 }
326 if(!AdjustSector(&track)){
327 seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
328 continue;
329 }
330 if(TMath::Abs(track.GetSnp()) > fgkMaxSnp) {
331 seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
332 continue;
333 }
334
335 nTPCseeds++;
e4d4864b 336
eb2b4f91 337 // store track status at TRD entrance
76b60503 338 seed->UpdateTrackParams(&track, AliESDtrack::kTRDbackup);
ae3fbe1f 339
eb2b4f91 340 // prepare track and do propagation in the TRD
341 track.SetReconstructor(fReconstructor);
342 track.SetKink(Bool_t(seed->GetKinkIndex(0)));
343 expectedClr = FollowBackProlongation(track);
344 // check if track entered the TRD fiducial volume
345 if(track.GetTrackLow()){
346 seed->UpdateTrackParams(&track, AliESDtrack::kTRDin);
347 nTRDseeds++;
348 }
349 // check if track was stopped in the TRD
350 if (expectedClr<0){
351 seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
352 continue;
353 }
ae3fbe1f 354
355 if(expectedClr){
eb2b4f91 356 nFound++;
41702fec 357 // computes PID for track
358 track.CookPID();
359 // update calibration references using this track
360 if(calibra->GetHisto2d()) calibra->UpdateHistogramsV1(&track);
361 // save calibration object
eb2b4f91 362 if (fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 0){
224f357f 363 AliTRDtrackV1 *calibTrack = new AliTRDtrackV1(track);
364 calibTrack->SetOwner();
365 seed->AddCalibObject(calibTrack);
366 }
367 //update ESD track
41702fec 368 if ((track.GetNumberOfClusters() > 15) && (track.GetNumberOfClusters() > 0.5*expectedClr)) {
2389e96f 369 seed->UpdateTrackParams(&track, AliESDtrack::kTRDout);
41702fec 370 track.UpdateESDtrack(seed);
41702fec 371 }
372 }
373
27fbeba8 374 if ((TMath::Abs(track.GetC(track.GetBz()) - p4) / TMath::Abs(p4) < 0.2) ||(track.Pt() > 0.8)) {
e3cf3d02 375
41702fec 376 // Make backup for back propagation
41702fec 377 Int_t foundClr = track.GetNumberOfClusters();
378 if (foundClr >= foundMin) {
41702fec 379 track.CookLabel(1. - fgkLabelFraction);
f29f13a6 380 //if(track.GetBackupTrack()) UseClusters(track.GetBackupTrack());
41702fec 381
382 // Sign only gold tracks
383 if (track.GetChi2() / track.GetNumberOfClusters() < 4) {
f29f13a6 384 //if ((seed->GetKinkIndex(0) == 0) && (track.Pt() < 1.5)) UseClusters(&track);
41702fec 385 }
386 Bool_t isGold = kFALSE;
387
388 // Full gold track
389 if (track.GetChi2() / track.GetNumberOfClusters() < 5) {
390 if (track.GetBackupTrack()) seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup);
391
392 isGold = kTRUE;
393 }
394
395 // Almost gold track
396 if ((!isGold) && (track.GetNCross() == 0) && (track.GetChi2() / track.GetNumberOfClusters() < 7)) {
397 //seed->UpdateTrackParams(track, AliESDtrack::kTRDbackup);
398 if (track.GetBackupTrack()) seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup);
399
400 isGold = kTRUE;
401 }
402
403 if ((!isGold) && (track.GetBackupTrack())) {
404 if ((track.GetBackupTrack()->GetNumberOfClusters() > foundMin) && ((track.GetBackupTrack()->GetChi2()/(track.GetBackupTrack()->GetNumberOfClusters()+1)) < 7)) {
405 seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup);
406 isGold = kTRUE;
407 }
408 }
41702fec 409 }
410 }
411
eb2b4f91 412 // Propagation to the TOF
413 if(!(seed->GetStatus()&AliESDtrack::kTRDStop)) {
414 Int_t sm = track.GetSector();
415 // default value in case we have problems with the geometry.
416 Double_t xtof = 371.;
417 //Calculate radial position of the beginning of the TOF
418 //mother volume. In order to avoid mixing of the TRD
419 //and TOF modules some hard values are needed. This are:
420 //1. The path to the TOF module.
421 //2. The width of the TOF (29.05 cm)
422 //(with the help of Annalisa de Caro Mar-17-2009)
423 if(gGeoManager){
424 gGeoManager->cd(Form("/ALIC_1/B077_1/BSEGMO%d_1/BTOF%d_1", sm, sm));
425 TGeoHMatrix *m = 0x0;
426 Double_t loc[]={0., 0., -.5*29.05}, glob[3];
427
428 if((m=gGeoManager->GetCurrentMatrix())){
429 m->LocalToMaster(loc, glob);
430 xtof = TMath::Sqrt(glob[0]*glob[0]+glob[1]*glob[1]);
431 }
41702fec 432 }
672b48bd 433 if(xtof > (fgkMaxStep + track.GetX()) && !PropagateToX(track, xtof, fgkMaxStep)){
434 seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
435 continue;
436 }
437 if(!AdjustSector(&track)){
438 seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
439 continue;
440 }
441 if(TMath::Abs(track.GetSnp()) > fgkMaxSnp){
442 seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
443 continue;
444 }
eb2b4f91 445 seed->UpdateTrackParams(&track, AliESDtrack::kTRDout);
446 // TODO obsolete - delete
447 seed->SetTRDQuality(track.StatusForTOF());
41702fec 448 }
41702fec 449 seed->SetTRDBudget(track.GetBudget(0));
450 }
d611c74f 451 if(index) delete [] index;
452 if(quality) delete [] quality;
41702fec 453
d4cf71ca 454 AliInfo(Form("Number of seeds: TPCout[%d] TRDin[%d]", nTPCseeds, nTRDseeds));
455 AliInfo(Form("Number of tracks: TRDout[%d]", nFound));
456
d611c74f 457 // run stand alone tracking
3a039a31 458 if (fReconstructor->IsSeeding()) Clusters2Tracks(event);
41702fec 459
460 return 0;
0906e73e 461}
462
463
464//____________________________________________________________________
465Int_t AliTRDtrackerV1::RefitInward(AliESDEvent *event)
466{
41702fec 467 //
468 // Refits tracks within the TRD. The ESD event is expected to contain seeds
469 // at the outer part of the TRD.
470 // The tracks are propagated to the innermost time bin
471 // of the TRD and the ESD event is updated
472 // Origin: Thomas KUHR (Thomas.Kuhr@cern.ch)
473 //
474
475 Int_t nseed = 0; // contor for loaded seeds
476 Int_t found = 0; // contor for updated TRD tracks
477
478
479 AliTRDtrackV1 track;
480 for (Int_t itrack = 0; itrack < event->GetNumberOfTracks(); itrack++) {
481 AliESDtrack *seed = event->GetTrack(itrack);
482 new(&track) AliTRDtrackV1(*seed);
483
484 if (track.GetX() < 270.0) {
485 seed->UpdateTrackParams(&track, AliESDtrack::kTRDbackup);
486 continue;
487 }
488
e3cf3d02 489 // reject tracks which failed propagation in the TRD or
490 // are produced by the TRD stand alone tracker
41702fec 491 ULong_t status = seed->GetStatus();
e3cf3d02 492 if(!(status & AliESDtrack::kTRDout)) continue;
493 if(!(status & AliESDtrack::kTRDin)) continue;
41702fec 494 nseed++;
495
496 track.ResetCovariance(50.0);
497
498 // do the propagation and processing
499 Bool_t kUPDATE = kFALSE;
500 Double_t xTPC = 250.0;
501 if(FollowProlongation(track)){
502 // Prolongate to TPC
503 if (PropagateToX(track, xTPC, fgkMaxStep)) { // -with update
e3cf3d02 504 seed->UpdateTrackParams(&track, AliESDtrack::kTRDrefit);
505 found++;
506 kUPDATE = kTRUE;
507 }
508
509 // Update the friend track
510 if (fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 0){
511 TObject *o = 0x0; Int_t ic = 0;
512 AliTRDtrackV1 *calibTrack = 0x0;
513 while((o = seed->GetCalibObject(ic++))){
514 if(!(calibTrack = dynamic_cast<AliTRDtrackV1*>(o))) continue;
515 calibTrack->SetTrackHigh(track.GetTrackHigh());
516 }
41702fec 517 }
e3cf3d02 518 }
41702fec 519
520 // Prolongate to TPC without update
521 if(!kUPDATE) {
522 AliTRDtrackV1 tt(*seed);
e3cf3d02 523 if (PropagateToX(tt, xTPC, fgkMaxStep)) seed->UpdateTrackParams(&tt, AliESDtrack::kTRDbackup);
41702fec 524 }
525 }
526 AliInfo(Form("Number of loaded seeds: %d",nseed));
527 AliInfo(Form("Number of found tracks from loaded seeds: %d",found));
528
529 return 0;
0906e73e 530}
531
0906e73e 532//____________________________________________________________________
533Int_t AliTRDtrackerV1::FollowProlongation(AliTRDtrackV1 &t)
534{
41702fec 535 // Extrapolates the TRD track in the TPC direction.
536 //
537 // Parameters
538 // t : the TRD track which has to be extrapolated
539 //
540 // Output
541 // number of clusters attached to the track
542 //
543 // Detailed description
544 //
545 // Starting from current radial position of track <t> this function
546 // extrapolates the track through the 6 TRD layers. The following steps
547 // are being performed for each plane:
548 // 1. prepare track:
549 // a. get plane limits in the local x direction
550 // b. check crossing sectors
551 // c. check track inclination
552 // 2. search tracklet in the tracker list (see GetTracklet() for details)
553 // 3. evaluate material budget using the geo manager
554 // 4. propagate and update track using the tracklet information.
555 //
556 // Debug level 2
557 //
558
e3cf3d02 559 Bool_t kStoreIn = kTRUE;
41702fec 560 Int_t nClustersExpected = 0;
e3cf3d02 561 for (Int_t iplane = kNPlanes; iplane--;) {
41702fec 562 Int_t index = 0;
563 AliTRDseedV1 *tracklet = GetTracklet(&t, iplane, index);
564 if(!tracklet) continue;
565 if(!tracklet->IsOK()) AliWarning("tracklet not OK");
566
e3cf3d02 567 Double_t x = tracklet->GetX();//GetX0();
41702fec 568 // reject tracklets which are not considered for inward refit
569 if(x > t.GetX()+fgkMaxStep) continue;
570
571 // append tracklet to track
572 t.SetTracklet(tracklet, index);
573
574 if (x < (t.GetX()-fgkMaxStep) && !PropagateToX(t, x+fgkMaxStep, fgkMaxStep)) break;
575 if (!AdjustSector(&t)) break;
576
577 // Start global position
578 Double_t xyz0[3];
579 t.GetXYZ(xyz0);
580
581 // End global position
582 Double_t alpha = t.GetAlpha(), y, z;
583 if (!t.GetProlongation(x,y,z)) break;
584 Double_t xyz1[3];
585 xyz1[0] = x * TMath::Cos(alpha) - y * TMath::Sin(alpha);
586 xyz1[1] = x * TMath::Sin(alpha) + y * TMath::Cos(alpha);
587 xyz1[2] = z;
588
51a23065 589 Double_t length = TMath::Sqrt(
590 (xyz0[0]-xyz1[0])*(xyz0[0]-xyz1[0]) +
591 (xyz0[1]-xyz1[1])*(xyz0[1]-xyz1[1]) +
592 (xyz0[2]-xyz1[2])*(xyz0[2]-xyz1[2])
593 );
594 if(length>0.){
595 // Get material budget
596 Double_t param[7];
597 if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param)<=0.) break;
598 Double_t xrho= param[0]*param[4];
599 Double_t xx0 = param[1]; // Get mean propagation parameters
600
601 // Propagate and update
602 t.PropagateTo(x, xx0, xrho);
603 if (!AdjustSector(&t)) break;
604 }
e3cf3d02 605 if(kStoreIn){
606 t.SetTrackHigh();
607 kStoreIn = kFALSE;
608 }
609
b72f4eaf 610 Double_t cov[3]; tracklet->GetCovAt(x, cov);
611 Double_t p[2] = { tracklet->GetY(), tracklet->GetZ()};
612 Double_t chi2 = ((AliExternalTrackParam)t).GetPredictedChi2(p, cov);
613 if (chi2 < 1e+10 && t.Update(p, cov, chi2)){
41702fec 614 nClustersExpected += tracklet->GetN();
615 }
616 }
617
3a039a31 618 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){
41702fec 619 Int_t index;
51a23065 620 for(int iplane=0; iplane<AliTRDgeometry::kNlayer; iplane++){
41702fec 621 AliTRDseedV1 *tracklet = GetTracklet(&t, iplane, index);
622 if(!tracklet) continue;
623 t.SetTracklet(tracklet, index);
624 }
625
626 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
29f95561 627 TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
eb2b4f91 628 AliTRDtrackV1 track(t);
629 track.SetOwner();
41702fec 630 cstreamer << "FollowProlongation"
631 << "EventNumber=" << eventNumber
632 << "ncl=" << nClustersExpected
eb2b4f91 633 << "track.=" << &track
41702fec 634 << "\n";
635 }
636
637 return nClustersExpected;
0906e73e 638
639}
640
641//_____________________________________________________________________________
642Int_t AliTRDtrackerV1::FollowBackProlongation(AliTRDtrackV1 &t)
643{
afa21247 644// Extrapolates/Build the TRD track in the TOF direction.
645//
646// Parameters
647// t : the TRD track which has to be extrapolated
648//
649// Output
650// number of clusters attached to the track
651//
652// Starting from current radial position of track <t> this function
653// extrapolates the track through the 6 TRD layers. The following steps
654// are being performed for each plane:
655// 1. Propagate track to the entrance of the next chamber:
656// - get chamber limits in the radial direction
657// - check crossing sectors
658// - check track inclination
659// - check track prolongation against boundary conditions (see exclusion boundaries on AliTRDgeometry::IsOnBoundary())
660// 2. Build tracklet (see AliTRDseed::AttachClusters() for details) for this layer if needed. If only
661// Kalman filter is needed and tracklets are already linked to the track this step is skipped.
662// 3. Fit tracklet using the information from the Kalman filter.
663// 4. Propagate and update track at reference radial position of the tracklet.
664// 5. Register tracklet with the tracker and track; update pulls monitoring.
665//
666// Observation
2a3191bb 667// 1. During the propagation a bit map is filled detailing the status of the track in each TRD chamber. The following errors are being registered for each tracklet:
668// - AliTRDtrackV1::kProlongation : track prolongation failed
669// - AliTRDtrackV1::kPropagation : track prolongation failed
670// - AliTRDtrackV1::kAdjustSector : failed during sector crossing
671// - AliTRDtrackV1::kSnp : too large bending
672// - AliTRDtrackV1::kTrackletInit : fail to initialize tracklet
673// - AliTRDtrackV1::kUpdate : fail to attach clusters or fit the tracklet
674// - AliTRDtrackV1::kUnknown : anything which is not covered before
afa21247 675// 2. By default the status of the track before first TRD update is saved.
676//
677// Debug level 2
678//
679// Author
680// Alexandru Bercuci <A.Bercuci@gsi.de>
681//
41702fec 682
eb2b4f91 683 Int_t n = 0;
684 Double_t driftLength = .5*AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick();
41702fec 685 AliTRDtrackingChamber *chamber = 0x0;
686
3b57a3f7 687 AliTRDseedV1 tracklet, *ptrTracklet = 0x0;
181d2c97 688 // in case of stand alone tracking we store all the pointers to the tracklets in a temporary array
689 AliTRDseedV1 *tracklets[kNPlanes];
690 memset(tracklets, 0, sizeof(AliTRDseedV1 *) * kNPlanes);
691 for(Int_t ip = 0; ip < kNPlanes; ip++){
692 tracklets[ip] = t.GetTracklet(ip);
693 t.UnsetTracklet(ip);
694 }
81a6494d 695 Bool_t kStoreIn = kTRUE, kPropagateIn = kTRUE;
e3cf3d02 696
053767a4 697 // Loop through the TRD layers
eb2b4f91 698 TGeoHMatrix *matrix = 0x0;
699 Double_t x, y, z;
700 for (Int_t ily=0, sm=-1, stk=-1, det=-1; ily < AliTRDgeometry::kNlayer; ily++) {
701 // rough estimate of the entry point
702 if (!t.GetProlongation(fR[ily], y, z)){
703 n=-1;
704 t.SetStatus(AliTRDtrackV1::kProlongation);
705 break;
706 }
41702fec 707
eb2b4f91 708 // find sector / stack / detector
709 sm = t.GetSector();
710 // TODO cross check with y value !
711 stk = fGeom->GetStack(z, ily);
712 det = stk>=0 ? AliTRDgeometry::GetDetector(ily, stk, sm) : -1;
713 matrix = det>=0 ? fGeom->GetClusterMatrix(det) : 0x0;
714
715 // check if supermodule/chamber is installed
716 if( !fGeom->GetSMstatus(sm) ||
717 stk<0. ||
718 fGeom->IsHole(ily, stk, sm) ||
719 !matrix ){
720 // propagate to the default radial position
721 if(fR[ily] > (fgkMaxStep + t.GetX()) && !PropagateToX(t, fR[ily], fgkMaxStep)){
722 n=-1;
723 t.SetStatus(AliTRDtrackV1::kPropagation);
41702fec 724 break;
725 }
eb2b4f91 726 if(!AdjustSector(&t)){
727 n=-1;
728 t.SetStatus(AliTRDtrackV1::kAdjustSector);
729 break;
730 }
731 if(TMath::Abs(t.GetSnp()) > fgkMaxSnp){
732 n=-1;
733 t.SetStatus(AliTRDtrackV1::kSnp);
734 break;
735 }
736 t.SetStatus(AliTRDtrackV1::kGeometry, ily);
41702fec 737 continue;
738 }
e3cf3d02 739
eb2b4f91 740 // retrieve rotation matrix for the current chamber
741 Double_t loc[] = {AliTRDgeometry::AnodePos()- driftLength, 0., 0.};
742 Double_t glb[] = {0., 0., 0.};
743 matrix->LocalToMaster(loc, glb);
744
745 // Propagate to the radial distance of the current layer
746 x = glb[0] - fgkMaxStep;
747 if(x > (fgkMaxStep + t.GetX()) && !PropagateToX(t, x, fgkMaxStep)){
748 n=-1;
749 t.SetStatus(AliTRDtrackV1::kPropagation);
750 break;
751 }
752 if(!AdjustSector(&t)){
753 n=-1;
754 t.SetStatus(AliTRDtrackV1::kAdjustSector);
755 break;
756 }
757 if(TMath::Abs(t.GetSnp()) > fgkMaxSnp) {
758 n=-1;
759 t.SetStatus(AliTRDtrackV1::kSnp);
760 break;
761 }
762 Bool_t RECALCULATE = kFALSE;
763 if(sm != t.GetSector()){
764 sm = t.GetSector();
765 RECALCULATE = kTRUE;
766 }
767 if(stk != fGeom->GetStack(z, ily)){
768 stk = fGeom->GetStack(z, ily);
769 RECALCULATE = kTRUE;
770 }
771 if(RECALCULATE){
772 det = AliTRDgeometry::GetDetector(ily, stk, sm);
773 if(!(matrix = fGeom->GetClusterMatrix(det))){
774 t.SetStatus(AliTRDtrackV1::kGeometry, ily);
775 continue;
776 }
777 matrix->LocalToMaster(loc, glb);
778 x = glb[0] - fgkMaxStep;
779 }
780
781 // check if track is well inside fiducial volume
782 if (!t.GetProlongation(x+fgkMaxStep, y, z)) {
783 n=-1;
784 t.SetStatus(AliTRDtrackV1::kProlongation);
785 break;
786 }
787 if(fGeom->IsOnBoundary(det, y, z, .5)){
788 t.SetStatus(AliTRDtrackV1::kBoundary, ily);
789 continue;
790 }
791 // mark track as entering the FIDUCIAL volume of TRD
e3cf3d02 792 if(kStoreIn){
793 t.SetTrackLow();
794 kStoreIn = kFALSE;
795 }
b1957d3c 796
eb2b4f91 797 ptrTracklet = tracklets[ily];
798 if(!ptrTracklet){ // BUILD TRACKLET
799 // check data in supermodule
800 if(!fTrSec[sm].GetNChambers()){
801 t.SetStatus(AliTRDtrackV1::kNoClusters, ily);
802 continue;
803 }
804 if(fTrSec[sm].GetX(ily) < 1.){
805 t.SetStatus(AliTRDtrackV1::kNoClusters, ily);
806 continue;
807 }
808
809 // check data in chamber
810 if(!(chamber = fTrSec[sm].GetChamber(stk, ily))){
811 t.SetStatus(AliTRDtrackV1::kNoClusters, ily);
812 continue;
813 }
814 if(chamber->GetNClusters() < fgNTimeBins*fReconstructor->GetRecoParam() ->GetFindableClusters()){
815 t.SetStatus(AliTRDtrackV1::kNoClusters, ily);
816 continue;
817 }
818 // build tracklet
819 ptrTracklet = new(&tracklet) AliTRDseedV1(det);
820 ptrTracklet->SetReconstructor(fReconstructor);
821 ptrTracklet->SetKink(t.IsKink());
822 ptrTracklet->SetPadPlane(fGeom->GetPadPlane(ily, stk));
823 ptrTracklet->SetX0(glb[0]+driftLength);
824 if(!tracklet.Init(&t)){
825 n=-1;
826 t.SetStatus(AliTRDtrackV1::kTrackletInit);
827 break;
828 }
829 if(!tracklet.AttachClusters(chamber, kTRUE)){
830 t.SetStatus(AliTRDtrackV1::kNoAttach, ily);
831 continue;
832 }
833 if(tracklet.GetN() < fgNTimeBins*fReconstructor->GetRecoParam() ->GetFindableClusters()){
834 t.SetStatus(AliTRDtrackV1::kNoClustersTracklet, ily);
835 continue;
836 }
837 ptrTracklet->UpdateUsed();
838 }
eb2b4f91 839 // propagate track to the radial position of the tracklet
840 ptrTracklet->UseClusters(); // TODO ? do we need this here ?
841 // fit tracklet no tilt correction
842 if(!ptrTracklet->Fit(kFALSE)){
843 t.SetStatus(AliTRDtrackV1::kNoFit, ily);
844 continue;
845 }
846 x = ptrTracklet->GetX(); //GetX0();
847 if(x > (fgkMaxStep + t.GetX()) && !PropagateToX(t, x, fgkMaxStep)) {
848 n=-1;
849 t.SetStatus(AliTRDtrackV1::kPropagation);
850 break;
851 }
852 if(!AdjustSector(&t)) {
853 n=-1;
854 t.SetStatus(AliTRDtrackV1::kAdjustSector);
855 break;
41702fec 856 }
eb2b4f91 857 if(TMath::Abs(t.GetSnp()) > fgkMaxSnp) {
858 n=-1;
859 t.SetStatus(AliTRDtrackV1::kSnp);
860 break;
861 }
81a6494d 862 if(kPropagateIn){
863 t.SetTrackLow();
864 kPropagateIn = kFALSE;
865 }
b72f4eaf 866 Double_t cov[3]; ptrTracklet->GetCovAt(x, cov);
867 Double_t p[2] = { ptrTracklet->GetY(), ptrTracklet->GetZ()};
868 Double_t chi2 = ((AliExternalTrackParam)t).GetPredictedChi2(p, cov);
6e39bde4 869 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 2){
870 Double_t ytrack = ptrTracklet->GetYref(0);
871 Double_t ztrack = ptrTracklet->GetZref(0);
872 Double_t ytracklet = ptrTracklet->GetYfit(0);
873 Double_t ztracklet = ptrTracklet->GetZfit(0);
874 Double_t phitrack = ptrTracklet->GetYref(1);
875 Double_t phitracklet = ptrTracklet->GetYfit(1);
876 Double_t thetatrack = ptrTracklet->GetZref(1);
877 Double_t thetatracklet = ptrTracklet->GetZfit(1);
878
879 TTreeSRedirector &mystreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
880 mystreamer << "FollowBackProlongation1"
881 << "il=" << ily
882 << "x=" << x
883 << "ytrack=" << ytrack
884 << "ztrack=" << ztrack
885 << "ytracklet=" << ytracklet
886 << "ztracklet=" << ztracklet
887 << "phitrack=" << phitrack
888 << "thetatrack=" << thetatrack
889 << "phitracklet=" << phitracklet
890 << "thetatracklet=" << thetatracklet
891 << "chi2=" << chi2
892 << "\n";
893 }
894 // update Kalman with the TRD measurement
b72f4eaf 895 if(chi2>1e+10){ // TODO
eb2b4f91 896 t.SetStatus(AliTRDtrackV1::kChi2, ily);
897 continue;
898 }
b72f4eaf 899 if(!t.Update(p, cov, chi2)) {
eb2b4f91 900 n=-1;
901 t.SetStatus(AliTRDtrackV1::kUpdate);
902 break;
903 }
b72f4eaf 904 // fill residuals ?!
905 AliTracker::FillResiduals(&t, p, cov, ptrTracklet->GetVolumeId());
906
eb2b4f91 907
908 // load tracklet to the tracker
16cca13f 909 ptrTracklet->Update(&t);
eb2b4f91 910 ptrTracklet = SetTracklet(ptrTracklet);
911 t.SetTracklet(ptrTracklet, fTracklets->GetEntriesFast()-1);
912 n += ptrTracklet->GetN();
913
41702fec 914 // Reset material budget if 2 consecutive gold
eb2b4f91 915// if(ilayer>0 && t.GetTracklet(ilayer-1) && ptrTracklet->GetN() + t.GetTracklet(ilayer-1)->GetN() > 20) t.SetBudget(2, 0.);
41702fec 916
917 // Make backup of the track until is gold
918 // TO DO update quality check of the track.
919 // consider comparison with fTimeBinsRange
920 Float_t ratio0 = ptrTracklet->GetN() / Float_t(fgNTimeBins);
921 //Float_t ratio1 = Float_t(t.GetNumberOfClusters()+1) / Float_t(t.GetNExpected()+1);
41702fec 922
eb2b4f91 923 if( (chi2 < 18.0) &&
41702fec 924 (ratio0 > 0.8) &&
925 //(ratio1 > 0.6) &&
926 //(ratio0+ratio1 > 1.5) &&
927 (t.GetNCross() == 0) &&
928 (TMath::Abs(t.GetSnp()) < 0.85) &&
e3cf3d02 929 (t.GetNumberOfClusters() > 20)){
930 t.MakeBackupTrack();
931 }
053767a4 932 } // end layers loop
eb2b4f91 933 //printf("clusters[%d] chi2[%f] x[%f] status[%d ", n, t.GetChi2(), t.GetX(), t.GetStatusTRD());
934 //for(int i=0; i<6; i++) printf("%d ", t.GetStatusTRD(i)); printf("]\n");
41702fec 935
3a039a31 936 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){
29f95561 937 TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
41702fec 938 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
eb2b4f91 939 AliTRDtrackV1 track(t);
940 track.SetOwner();
41702fec 941 cstreamer << "FollowBackProlongation"
eb2b4f91 942 << "EventNumber=" << eventNumber
943 << "ncl=" << n
944 << "track.=" << &track
41702fec 945 << "\n";
946 }
947
eb2b4f91 948 return n;
0906e73e 949}
950
eb38ed55 951//_________________________________________________________________________
952Float_t AliTRDtrackerV1::FitRieman(AliTRDseedV1 *tracklets, Double_t *chi2, Int_t *planes){
41702fec 953 //
954 // Fits a Riemann-circle to the given points without tilting pad correction.
955 // The fit is performed using an instance of the class AliRieman (equations
956 // and transformations see documentation of this class)
957 // Afterwards all the tracklets are Updated
958 //
959 // Parameters: - Array of tracklets (AliTRDseedV1)
960 // - Storage for the chi2 values (beginning with direction z)
961 // - Seeding configuration
962 // Output: - The curvature
963 //
964 AliRieman *fitter = AliTRDtrackerV1::GetRiemanFitter();
965 fitter->Reset();
966 Int_t allplanes[] = {0, 1, 2, 3, 4, 5};
967 Int_t *ppl = &allplanes[0];
968 Int_t maxLayers = 6;
969 if(planes){
970 maxLayers = 4;
971 ppl = planes;
972 }
973 for(Int_t il = 0; il < maxLayers; il++){
974 if(!tracklets[ppl[il]].IsOK()) continue;
e3cf3d02 975 fitter->AddPoint(tracklets[ppl[il]].GetX0(), tracklets[ppl[il]].GetYfit(0), tracklets[ppl[il]].GetZfit(0),1,10);
41702fec 976 }
977 fitter->Update();
978 // Set the reference position of the fit and calculate the chi2 values
979 memset(chi2, 0, sizeof(Double_t) * 2);
980 for(Int_t il = 0; il < maxLayers; il++){
981 // Reference positions
982 tracklets[ppl[il]].Init(fitter);
983
984 // chi2
985 if((!tracklets[ppl[il]].IsOK()) && (!planes)) continue;
986 chi2[0] += tracklets[ppl[il]].GetChi2Y();
987 chi2[1] += tracklets[ppl[il]].GetChi2Z();
988 }
989 return fitter->GetC();
eb38ed55 990}
991
992//_________________________________________________________________________
993void AliTRDtrackerV1::FitRieman(AliTRDcluster **seedcl, Double_t chi2[2])
994{
41702fec 995 //
996 // Performs a Riemann helix fit using the seedclusters as spacepoints
997 // Afterwards the chi2 values are calculated and the seeds are updated
998 //
999 // Parameters: - The four seedclusters
1000 // - The tracklet array (AliTRDseedV1)
1001 // - The seeding configuration
1002 // - Chi2 array
1003 //
1004 // debug level 2
1005 //
1006 AliRieman *fitter = AliTRDtrackerV1::GetRiemanFitter();
1007 fitter->Reset();
a3743898 1008 for(Int_t i = 0; i < 4; i++){
a3743898 1009 fitter->AddPoint(seedcl[i]->GetX(), seedcl[i]->GetY(), seedcl[i]->GetZ(), 1., 10.);
1010 }
41702fec 1011 fitter->Update();
1012
1013
1014 // Update the seed and calculated the chi2 value
1015 chi2[0] = 0; chi2[1] = 0;
1016 for(Int_t ipl = 0; ipl < kNSeedPlanes; ipl++){
1017 // chi2
1018 chi2[0] += (seedcl[ipl]->GetZ() - fitter->GetZat(seedcl[ipl]->GetX())) * (seedcl[ipl]->GetZ() - fitter->GetZat(seedcl[ipl]->GetX()));
1019 chi2[1] += (seedcl[ipl]->GetY() - fitter->GetYat(seedcl[ipl]->GetX())) * (seedcl[ipl]->GetY() - fitter->GetYat(seedcl[ipl]->GetX()));
1020 }
eb38ed55 1021}
1022
1023
1024//_________________________________________________________________________
1025Float_t AliTRDtrackerV1::FitTiltedRiemanConstraint(AliTRDseedV1 *tracklets, Double_t zVertex)
1026{
41702fec 1027 //
1028 // Fits a helix to the clusters. Pad tilting is considered. As constraint it is
1029 // assumed that the vertex position is set to 0.
1030 // This method is very usefull for high-pt particles
1031 // Basis for the fit: (x - x0)^2 + (y - y0)^2 - R^2 = 0
1032 // x0, y0: Center of the circle
1033 // Measured y-position: ymeas = y - tan(phiT)(zc - zt)
1034 // zc: center of the pad row
1035 // Equation which has to be fitted (after transformation):
1036 // a + b * u + e * v + 2*(ymeas + tan(phiT)(z - zVertex))*t = 0
1037 // Transformation:
1038 // t = 1/(x^2 + y^2)
1039 // u = 2 * x * t
1040 // v = 2 * x * tan(phiT) * t
1041 // Parameters in the equation:
1042 // a = -1/y0, b = x0/y0, e = dz/dx
1043 //
1044 // The Curvature is calculated by the following equation:
1045 // - curv = a/Sqrt(b^2 + 1) = 1/R
1046 // Parameters: - the 6 tracklets
1047 // - the Vertex constraint
1048 // Output: - the Chi2 value of the track
1049 //
1050 // debug level 5
1051 //
1052
1053 TLinearFitter *fitter = GetTiltedRiemanFitterConstraint();
1054 fitter->StoreData(kTRUE);
1055 fitter->ClearPoints();
1056 AliTRDcluster *cl = 0x0;
1057
1058 Float_t x, y, z, w, t, error, tilt;
1059 Double_t uvt[2];
1060 Int_t nPoints = 0;
053767a4 1061 for(Int_t ilr = 0; ilr < AliTRDgeometry::kNlayer; ilr++){
1062 if(!tracklets[ilr].IsOK()) continue;
8d2bec9e 1063 for(Int_t itb = 0; itb < AliTRDseedV1::kNclusters; itb++){
053767a4 1064 if(!tracklets[ilr].IsUsable(itb)) continue;
1065 cl = tracklets[ilr].GetClusters(itb);
1742f24c 1066 if(!cl->IsInChamber()) continue;
41702fec 1067 x = cl->GetX();
1068 y = cl->GetY();
1069 z = cl->GetZ();
053767a4 1070 tilt = tracklets[ilr].GetTilt();
41702fec 1071 // Transformation
1072 t = 1./(x * x + y * y);
1073 uvt[0] = 2. * x * t;
1074 uvt[1] = 2. * x * t * tilt ;
1075 w = 2. * (y + tilt * (z - zVertex)) * t;
78b7d24c 1076 error = 2. * TMath::Sqrt(cl->GetSigmaY2()+tilt*tilt*cl->GetSigmaZ2()) * t;
41702fec 1077 fitter->AddPoint(uvt, w, error);
1078 nPoints++;
1079 }
1080 }
1081 fitter->Eval();
1082
1083 // Calculate curvature
1084 Double_t a = fitter->GetParameter(0);
1085 Double_t b = fitter->GetParameter(1);
1086 Double_t curvature = a/TMath::Sqrt(b*b + 1);
1087
1088 Float_t chi2track = fitter->GetChisquare()/Double_t(nPoints);
1089 for(Int_t ip = 0; ip < AliTRDtrackerV1::kNPlanes; ip++)
e3cf3d02 1090 tracklets[ip].SetC(curvature);
41702fec 1091
3a039a31 1092/* if(fReconstructor->GetStreamLevel() >= 5){
41702fec 1093 //Linear Model on z-direction
1094 Double_t xref = CalculateReferenceX(tracklets); // Relative to the middle of the stack
1095 Double_t slope = fitter->GetParameter(2);
1096 Double_t zref = slope * xref;
1097 Float_t chi2Z = CalculateChi2Z(tracklets, zref, slope, xref);
1098 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
1099 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
29f95561 1100 TTreeSRedirector &treeStreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
41702fec 1101 treeStreamer << "FitTiltedRiemanConstraint"
1102 << "EventNumber=" << eventNumber
1103 << "CandidateNumber=" << candidateNumber
1104 << "Curvature=" << curvature
1105 << "Chi2Track=" << chi2track
1106 << "Chi2Z=" << chi2Z
1107 << "zref=" << zref
1108 << "\n";
3a039a31 1109 }*/
41702fec 1110 return chi2track;
eb38ed55 1111}
1112
1113//_________________________________________________________________________
1114Float_t AliTRDtrackerV1::FitTiltedRieman(AliTRDseedV1 *tracklets, Bool_t sigError)
1115{
41702fec 1116 //
1117 // Performs a Riemann fit taking tilting pad correction into account
1118 // The equation of a Riemann circle, where the y position is substituted by the
1119 // measured y-position taking pad tilting into account, has to be transformed
1120 // into a 4-dimensional hyperplane equation
1121 // Riemann circle: (x-x0)^2 + (y-y0)^2 -R^2 = 0
1122 // Measured y-Position: ymeas = y - tan(phiT)(zc - zt)
1123 // zc: center of the pad row
1124 // zt: z-position of the track
1125 // The z-position of the track is assumed to be linear dependent on the x-position
1126 // Transformed equation: a + b * u + c * t + d * v + e * w - 2 * (ymeas + tan(phiT) * zc) * t = 0
1127 // Transformation: u = 2 * x * t
1128 // v = 2 * tan(phiT) * t
1129 // w = 2 * tan(phiT) * (x - xref) * t
1130 // t = 1 / (x^2 + ymeas^2)
1131 // Parameters: a = -1/y0
1132 // b = x0/y0
1133 // c = (R^2 -x0^2 - y0^2)/y0
1134 // d = offset
1135 // e = dz/dx
1136 // If the offset respectively the slope in z-position is impossible, the parameters are fixed using
1137 // results from the simple riemann fit. Afterwards the fit is redone.
1138 // The curvature is calculated according to the formula:
1139 // curv = a/(1 + b^2 + c*a) = 1/R
1140 //
1141 // Paramters: - Array of tracklets (connected to the track candidate)
1142 // - Flag selecting the error definition
1143 // Output: - Chi2 values of the track (in Parameter list)
1144 //
1145 TLinearFitter *fitter = GetTiltedRiemanFitter();
1146 fitter->StoreData(kTRUE);
1147 fitter->ClearPoints();
1148 AliTRDLeastSquare zfitter;
1149 AliTRDcluster *cl = 0x0;
1150
1151 Double_t xref = CalculateReferenceX(tracklets);
6e39bde4 1152 Double_t x, y, z, t, tilt, dx, w, we, erry, errz;
1153 Double_t uvt[4], sumPolY[5], sumPolZ[3];
1154 memset(sumPolY, 0, sizeof(Double_t) * 5);
1155 memset(sumPolZ, 0, sizeof(Double_t) * 3);
41702fec 1156 Int_t nPoints = 0;
1157 // Containers for Least-square fitter
1158 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1159 if(!tracklets[ipl].IsOK()) continue;
ed15ef4f 1160 tilt = tracklets[ipl].GetTilt();
8d2bec9e 1161 for(Int_t itb = 0; itb < AliTRDseedV1::kNclusters; itb++){
41702fec 1162 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1742f24c 1163 if(!cl->IsInChamber()) continue;
41702fec 1164 if (!tracklets[ipl].IsUsable(itb)) continue;
1165 x = cl->GetX();
1166 y = cl->GetY();
1167 z = cl->GetZ();
41702fec 1168 dx = x - xref;
1169 // Transformation
1170 t = 1./(x*x + y*y);
1171 uvt[0] = 2. * x * t;
1172 uvt[1] = t;
1173 uvt[2] = 2. * tilt * t;
1174 uvt[3] = 2. * tilt * dx * t;
1175 w = 2. * (y + tilt*z) * t;
1176 // error definition changes for the different calls
1177 we = 2. * t;
78b7d24c 1178 we *= sigError ? TMath::Sqrt(cl->GetSigmaY2()+tilt*tilt*cl->GetSigmaZ2()) : 0.2;
41702fec 1179 fitter->AddPoint(uvt, w, we);
1180 zfitter.AddPoint(&x, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
6e39bde4 1181 // adding points for covariance matrix estimation
1182 erry = 1./(TMath::Sqrt(cl->GetSigmaY2()) + 0.1); // 0.1 is a systematic error (due to misalignment and miscalibration)
1183 erry *= erry;
1184 errz = 1./cl->GetSigmaZ2();
1185 for(Int_t ipol = 0; ipol < 5; ipol++){
1186 sumPolY[ipol] += erry;
1187 erry *= x;
1188 if(ipol < 3){
1189 sumPolZ[ipol] += errz;
1190 errz *= x;
1191 }
1192 }
41702fec 1193 nPoints++;
1194 }
1195 }
1196 fitter->Eval();
1197 zfitter.Eval();
1198
1199 Double_t offset = fitter->GetParameter(3);
1200 Double_t slope = fitter->GetParameter(4);
1201
1202 // Linear fitter - not possible to make boundaries
1203 // Do not accept non possible z and dzdx combinations
1204 Bool_t acceptablez = kTRUE;
1205 Double_t zref = 0.0;
1206 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
1207 if(!tracklets[iLayer].IsOK()) continue;
1208 zref = offset + slope * (tracklets[iLayer].GetX0() - xref);
e3cf3d02 1209 if (TMath::Abs(tracklets[iLayer].GetZfit(0) - zref) > tracklets[iLayer].GetPadLength() * 0.5 + 1.0)
41702fec 1210 acceptablez = kFALSE;
1211 }
1212 if (!acceptablez) {
1213 Double_t dzmf = zfitter.GetFunctionParameter(1);
1214 Double_t zmf = zfitter.GetFunctionValue(&xref);
1215 fgTiltedRieman->FixParameter(3, zmf);
1216 fgTiltedRieman->FixParameter(4, dzmf);
1217 fitter->Eval();
1218 fitter->ReleaseParameter(3);
1219 fitter->ReleaseParameter(4);
1220 offset = fitter->GetParameter(3);
1221 slope = fitter->GetParameter(4);
1222 }
1223
1224 // Calculate Curvarture
1225 Double_t a = fitter->GetParameter(0);
1226 Double_t b = fitter->GetParameter(1);
1227 Double_t c = fitter->GetParameter(2);
1228 Double_t curvature = 1.0 + b*b - c*a;
1229 if (curvature > 0.0)
1230 curvature = a / TMath::Sqrt(curvature);
1231
1232 Double_t chi2track = fitter->GetChisquare()/Double_t(nPoints);
1233
6e39bde4 1234 // Prepare error calculation
1235 TMatrixD covarPolY(3,3);
1236 covarPolY(0,0) = sumPolY[0]; covarPolY(1,1) = sumPolY[2]; covarPolY(2,2) = sumPolY[4];
1237 covarPolY(0,1) = covarPolY(1,0) = sumPolY[1];
1238 covarPolY(0,2) = covarPolY(2,0) = sumPolY[2];
1239 covarPolY(2,1) = covarPolY(1,2) = sumPolY[3];
1240 covarPolY.Invert();
1241 TMatrixD covarPolZ(2,2);
1242 covarPolZ(0,0) = sumPolZ[0]; covarPolZ(1,1) = sumPolZ[2];
1243 covarPolZ(1,0) = covarPolZ(0,1) = sumPolZ[1];
1244 covarPolZ.Invert();
1245
41702fec 1246 // Update the tracklets
6e39bde4 1247 Double_t x1, dy, dz;
1248 Double_t cov[15];
1249 memset(cov, 0, sizeof(Double_t) * 15);
41702fec 1250 for(Int_t iLayer = 0; iLayer < AliTRDtrackerV1::kNPlanes; iLayer++) {
1251
1252 x = tracklets[iLayer].GetX0();
6e39bde4 1253 x1 = x - xref;
41702fec 1254 y = 0;
1255 z = 0;
1256 dy = 0;
1257 dz = 0;
6e39bde4 1258 memset(cov, 0, sizeof(Double_t) * 3);
1259 TMatrixD transform(3,3);
1260 transform(0,0) = 1;
1261 transform(0,1) = x;
1262 transform(0,2) = x*x;
1263 transform(1,1) = 1;
1264 transform(1,2) = x;
1265 transform(2,2) = 1;
1266 TMatrixD covariance(transform, TMatrixD::kMult, covarPolY);
1267 covariance *= transform.T();
1268 TMatrixD transformZ(2,2);
1269 transformZ(0,0) = transformZ(1,1) = 1;
1270 transformZ(0,1) = x;
1271 TMatrixD covarZ(transformZ, TMatrixD::kMult, covarPolZ);
1272 covarZ *= transformZ.T();
41702fec 1273 // y: R^2 = (x - x0)^2 + (y - y0)^2
1274 // => y = y0 +/- Sqrt(R^2 - (x - x0)^2)
1275 // R = Sqrt() = 1/Curvature
1276 // => y = y0 +/- Sqrt(1/Curvature^2 - (x - x0)^2)
1277 Double_t res = (x * a + b); // = (x - x0)/y0
1278 res *= res;
1279 res = 1.0 - c * a + b * b - res; // = (R^2 - (x - x0)^2)/y0^2
1280 if (res >= 0) {
1281 res = TMath::Sqrt(res);
1282 y = (1.0 - res) / a;
1283 }
6e39bde4 1284 cov[0] = covariance(0,0);
1285 cov[2] = covarZ(0,0);
1286 cov[1] = 0.;
41702fec 1287
1288 // dy: R^2 = (x - x0)^2 + (y - y0)^2
1289 // => y = +/- Sqrt(R^2 - (x - x0)^2) + y0
1290 // => dy/dx = (x - x0)/Sqrt(R^2 - (x - x0)^2)
1291 // Curvature: cr = 1/R = a/Sqrt(1 + b^2 - c*a)
1292 // => dy/dx = (x - x0)/(1/(cr^2) - (x - x0)^2)
1293 Double_t x0 = -b / a;
1294 if (-c * a + b * b + 1 > 0) {
1295 if (1.0/(curvature * curvature) - (x - x0) * (x - x0) > 0.0) {
6e39bde4 1296 Double_t yderiv = (x - x0) / TMath::Sqrt(1.0/(curvature * curvature) - (x - x0) * (x - x0));
1297 if (a < 0) yderiv *= -1.0;
1298 dy = yderiv;
41702fec 1299 }
1300 }
1301 z = offset + slope * (x - xref);
1302 dz = slope;
1303 tracklets[iLayer].SetYref(0, y);
1304 tracklets[iLayer].SetYref(1, dy);
1305 tracklets[iLayer].SetZref(0, z);
1306 tracklets[iLayer].SetZref(1, dz);
1307 tracklets[iLayer].SetC(curvature);
6e39bde4 1308 tracklets[iLayer].SetCovRef(cov);
41702fec 1309 tracklets[iLayer].SetChi2(chi2track);
1310 }
1311
3a039a31 1312/* if(fReconstructor->GetStreamLevel() >=5){
29f95561 1313 TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
41702fec 1314 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
1315 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
1316 Double_t chi2z = CalculateChi2Z(tracklets, offset, slope, xref);
1317 cstreamer << "FitTiltedRieman0"
1318 << "EventNumber=" << eventNumber
1319 << "CandidateNumber=" << candidateNumber
1320 << "xref=" << xref
1321 << "Chi2Z=" << chi2z
1322 << "\n";
3a039a31 1323 }*/
41702fec 1324 return chi2track;
eb38ed55 1325}
1326
3b57a3f7 1327
9e333711 1328//____________________________________________________________________
6e4d4425 1329Double_t AliTRDtrackerV1::FitLine(const AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t err, Int_t np, AliTrackPoint *points)
9e333711 1330{
1331 AliTRDLeastSquare yfitter, zfitter;
1332 AliTRDcluster *cl = 0x0;
1333
1334 AliTRDseedV1 work[kNPlanes], *tracklet = 0x0;
1335 if(!tracklets){
1336 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1337 if(!(tracklet = track->GetTracklet(ipl))) continue;
1338 if(!tracklet->IsOK()) continue;
1339 new(&work[ipl]) AliTRDseedV1(*tracklet);
1340 }
1341 tracklets = &work[0];
1342 }
1343
1344 Double_t xref = CalculateReferenceX(tracklets);
1345 Double_t x, y, z, dx, ye, yr, tilt;
1346 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1347 if(!tracklets[ipl].IsOK()) continue;
1348 for(Int_t itb = 0; itb < fgNTimeBins; itb++){
1349 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1350 if (!tracklets[ipl].IsUsable(itb)) continue;
1351 x = cl->GetX();
1352 z = cl->GetZ();
1353 dx = x - xref;
1354 zfitter.AddPoint(&dx, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
1355 }
1356 }
1357 zfitter.Eval();
1358 Double_t z0 = zfitter.GetFunctionParameter(0);
1359 Double_t dzdx = zfitter.GetFunctionParameter(1);
1360 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1361 if(!tracklets[ipl].IsOK()) continue;
1362 for(Int_t itb = 0; itb < fgNTimeBins; itb++){
1363 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1364 if (!tracklets[ipl].IsUsable(itb)) continue;
1365 x = cl->GetX();
1366 y = cl->GetY();
1367 z = cl->GetZ();
1368 tilt = tracklets[ipl].GetTilt();
1369 dx = x - xref;
1370 yr = y + tilt*(z - z0 - dzdx*dx);
1371 // error definition changes for the different calls
1372 ye = tilt*TMath::Sqrt(cl->GetSigmaZ2());
1373 ye += err ? tracklets[ipl].GetSigmaY() : 0.2;
1374 yfitter.AddPoint(&dx, yr, ye);
1375 }
1376 }
1377 yfitter.Eval();
1378 Double_t y0 = yfitter.GetFunctionParameter(0);
1379 Double_t dydx = yfitter.GetFunctionParameter(1);
1380 Double_t chi2 = 0.;//yfitter.GetChisquare()/Double_t(nPoints);
1381
1382 //update track points array
1383 if(np && points){
1384 Float_t xyz[3];
1385 for(int ip=0; ip<np; ip++){
1386 points[ip].GetXYZ(xyz);
1387 xyz[1] = y0 + dydx * (xyz[0] - xref);
1388 xyz[2] = z0 + dzdx * (xyz[0] - xref);
1389 points[ip].SetXYZ(xyz);
1390 }
1391 }
1392 return chi2;
1393}
1394
1395
3b57a3f7 1396//_________________________________________________________________________
6e4d4425 1397Double_t AliTRDtrackerV1::FitRiemanTilt(const AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t sigError, Int_t np, AliTrackPoint *points)
3b57a3f7 1398{
0fa1a8ee 1399//
1400// Performs a Riemann fit taking tilting pad correction into account
1401//
1402// Paramters: - Array of tracklets (connected to the track candidate)
1403// - Flag selecting the error definition
1404// Output: - Chi2 values of the track (in Parameter list)
1405//
1406// The equations which has to be solved simultaneously are:
1407// BEGIN_LATEX
1408// R^{2} = (x-x_{0})^{2} + (y^{*}-y_{0})^{2}
1409// y^{*} = y - tg(h)(z - z_{t})
1410// z_{t} = z_{0}+dzdx*(x-x_{r})
1411// END_LATEX
1412// with (x, y, z) the coordinate of the cluster, (x_0, y_0, z_0) the coordinate of the center of the Riemann circle,
1413// R its radius, x_r a constant refrence radial position in the middle of the TRD stack and dzdx the slope of the
1414// track in the x-z plane. Using the following transformations
1415// BEGIN_LATEX
1416// t = 1 / (x^{2} + y^{2})
1417// u = 2 * x * t
1418// v = 2 * tan(h) * t
1419// w = 2 * tan(h) * (x - x_{r}) * t
1420// END_LATEX
1421// One gets the following linear equation
1422// BEGIN_LATEX
1423// a + b * u + c * t + d * v + e * w = 2 * (y + tg(h) * z) * t
1424// END_LATEX
1425// where the coefficients have the following meaning
1426// BEGIN_LATEX
1427// a = -1/y_{0}
1428// b = x_{0}/y_{0}
1429// c = (R^{2} -x_{0}^{2} - y_{0}^{2})/y_{0}
1430// d = z_{0}
1431// e = dz/dx
1432// END_LATEX
1433// The error calculation for the free term is thus
1434// BEGIN_LATEX
1435// #sigma = 2 * #sqrt{#sigma^{2}_{y} + (tilt corr ...) + tg^{2}(h) * #sigma^{2}_{z}} * t
1436// END_LATEX
1437//
1438// From this simple model one can compute chi^2 estimates and a rough approximation of pt from the curvature according
1439// to the formula:
1440// BEGIN_LATEX
1441// C = 1/R = a/(1 + b^{2} + c*a)
1442// END_LATEX
1443//
1444// Authors
1445// M.Ivanov <M.Ivanov@gsi.de>
1446// A.Bercuci <A.Bercuci@gsi.de>
1447// M.Fasel <M.Fasel@gsi.de>
1448
41702fec 1449 TLinearFitter *fitter = GetTiltedRiemanFitter();
1450 fitter->StoreData(kTRUE);
1451 fitter->ClearPoints();
1452 AliTRDLeastSquare zfitter;
1453 AliTRDcluster *cl = 0x0;
3b57a3f7 1454
1455 AliTRDseedV1 work[kNPlanes], *tracklet = 0x0;
1456 if(!tracklets){
1457 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1458 if(!(tracklet = track->GetTracklet(ipl))) continue;
1459 if(!tracklet->IsOK()) continue;
1460 new(&work[ipl]) AliTRDseedV1(*tracklet);
1461 }
1462 tracklets = &work[0];
1463 }
1464
41702fec 1465 Double_t xref = CalculateReferenceX(tracklets);
1466 Double_t x, y, z, t, tilt, dx, w, we;
1467 Double_t uvt[4];
1468 Int_t nPoints = 0;
1469 // Containers for Least-square fitter
1470 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1471 if(!tracklets[ipl].IsOK()) continue;
8d2bec9e 1472 for(Int_t itb = 0; itb < AliTRDseedV1::kNclusters; itb++){
41702fec 1473 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1474 if (!tracklets[ipl].IsUsable(itb)) continue;
1475 x = cl->GetX();
1476 y = cl->GetY();
1477 z = cl->GetZ();
1478 tilt = tracklets[ipl].GetTilt();
1479 dx = x - xref;
1480 // Transformation
1481 t = 1./(x*x + y*y);
1482 uvt[0] = 2. * x * t;
1483 uvt[1] = t;
1484 uvt[2] = 2. * tilt * t;
1485 uvt[3] = 2. * tilt * dx * t;
1486 w = 2. * (y + tilt*z) * t;
1487 // error definition changes for the different calls
1488 we = 2. * t;
f29f13a6 1489 we *= sigError ? TMath::Sqrt(cl->GetSigmaY2()) : 0.2;
41702fec 1490 fitter->AddPoint(uvt, w, we);
1491 zfitter.AddPoint(&x, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
1492 nPoints++;
1493 }
1494 }
aec26713 1495 if(fitter->Eval()) return 1.E10;
1496
41702fec 1497 Double_t z0 = fitter->GetParameter(3);
1498 Double_t dzdx = fitter->GetParameter(4);
3b57a3f7 1499
1500
1501 // Linear fitter - not possible to make boundaries
1502 // Do not accept non possible z and dzdx combinations
1503 Bool_t accept = kTRUE;
1504 Double_t zref = 0.0;
1505 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
1506 if(!tracklets[iLayer].IsOK()) continue;
1507 zref = z0 + dzdx * (tracklets[iLayer].GetX0() - xref);
e3cf3d02 1508 if (TMath::Abs(tracklets[iLayer].GetZfit(0) - zref) > tracklets[iLayer].GetPadLength() * 0.5 + 1.0)
3b57a3f7 1509 accept = kFALSE;
1510 }
1511 if (!accept) {
41702fec 1512 zfitter.Eval();
3b57a3f7 1513 Double_t dzmf = zfitter.GetFunctionParameter(1);
1514 Double_t zmf = zfitter.GetFunctionValue(&xref);
1515 fitter->FixParameter(3, zmf);
1516 fitter->FixParameter(4, dzmf);
1517 fitter->Eval();
1518 fitter->ReleaseParameter(3);
1519 fitter->ReleaseParameter(4);
1520 z0 = fitter->GetParameter(3); // = zmf ?
1521 dzdx = fitter->GetParameter(4); // = dzmf ?
1522 }
1523
1524 // Calculate Curvature
1525 Double_t a = fitter->GetParameter(0);
1526 Double_t b = fitter->GetParameter(1);
1527 Double_t c = fitter->GetParameter(2);
1528 Double_t y0 = 1. / a;
1529 Double_t x0 = -b * y0;
a015e406 1530 Double_t tmp = y0*y0 + x0*x0 - c*y0;
1531 if(tmp<=0.) return 1.E10;
1532 Double_t R = TMath::Sqrt(tmp);
3b57a3f7 1533 Double_t C = 1.0 + b*b - c*a;
1534 if (C > 0.0) C = a / TMath::Sqrt(C);
1535
1536 // Calculate chi2 of the fit
1537 Double_t chi2 = fitter->GetChisquare()/Double_t(nPoints);
1538
1539 // Update the tracklets
1540 if(!track){
1541 for(Int_t ip = 0; ip < kNPlanes; ip++) {
1542 x = tracklets[ip].GetX0();
90cf7133 1543 tmp = R*R-(x-x0)*(x-x0);
a015e406 1544 if(tmp <= 0.) continue;
1545 tmp = TMath::Sqrt(tmp);
3b57a3f7 1546
1547 // y: R^2 = (x - x0)^2 + (y - y0)^2
1548 // => y = y0 +/- Sqrt(R^2 - (x - x0)^2)
1549 tracklets[ip].SetYref(0, y0 - (y0>0.?1.:-1)*tmp);
1550 // => dy/dx = (x - x0)/Sqrt(R^2 - (x - x0)^2)
1551 tracklets[ip].SetYref(1, (x - x0) / tmp);
1552 tracklets[ip].SetZref(0, z0 + dzdx * (x - xref));
1553 tracklets[ip].SetZref(1, dzdx);
1554 tracklets[ip].SetC(C);
1555 tracklets[ip].SetChi2(chi2);
1556 }
1557 }
3b57a3f7 1558 //update track points array
1559 if(np && points){
1560 Float_t xyz[3];
1561 for(int ip=0; ip<np; ip++){
1562 points[ip].GetXYZ(xyz);
60e55aee 1563 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 1564 xyz[2] = z0 + dzdx * (xyz[0] - xref);
1565 points[ip].SetXYZ(xyz);
1566 }
1567 }
1568
3b57a3f7 1569 return chi2;
1570}
1571
1572
1bf51039 1573//____________________________________________________________________
1574Double_t AliTRDtrackerV1::FitKalman(AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t up, Int_t np, AliTrackPoint *points)
1575{
1576// Kalman filter implementation for the TRD.
1577// It returns the positions of the fit in the array "points"
1578//
1579// Author : A.Bercuci@gsi.de
1580
3cfaffa4 1581 // printf("Start track @ x[%f]\n", track->GetX());
1bf51039 1582
1583 //prepare marker points along the track
1584 Int_t ip = np ? 0 : 1;
1585 while(ip<np){
1586 if((up?-1:1) * (track->GetX() - points[ip].GetX()) > 0.) break;
1587 //printf("AliTRDtrackerV1::FitKalman() : Skip track marker x[%d] = %7.3f. Before track start ( %7.3f ).\n", ip, points[ip].GetX(), track->GetX());
1588 ip++;
1589 }
1590 //if(points) printf("First marker point @ x[%d] = %f\n", ip, points[ip].GetX());
1591
1592
1593 AliTRDseedV1 tracklet, *ptrTracklet = 0x0;
1594
1595 //Loop through the TRD planes
1596 for (Int_t jplane = 0; jplane < kNPlanes; jplane++) {
1597 // GET TRACKLET OR BUILT IT
1598 Int_t iplane = up ? jplane : kNPlanes - 1 - jplane;
1599 if(tracklets){
1600 if(!(ptrTracklet = &tracklets[iplane])) continue;
1601 }else{
1602 if(!(ptrTracklet = track->GetTracklet(iplane))){
1603 /*AliTRDtrackerV1 *tracker = 0x0;
1604 if(!(tracker = dynamic_cast<AliTRDtrackerV1*>( AliTRDReconstructor::Tracker()))) continue;
1605 ptrTracklet = new(&tracklet) AliTRDseedV1(iplane);
1606 if(!tracker->MakeTracklet(ptrTracklet, track)) */
1607 continue;
1608 }
1609 }
1610 if(!ptrTracklet->IsOK()) continue;
1611
1612 Double_t x = ptrTracklet->GetX0();
1613
1614 while(ip < np){
1615 //don't do anything if next marker is after next update point.
1616 if((up?-1:1) * (points[ip].GetX() - x) - fgkMaxStep < 0) break;
1bf51039 1617 if(((up?-1:1) * (points[ip].GetX() - track->GetX()) < 0) && !PropagateToX(*track, points[ip].GetX(), fgkMaxStep)) return -1.;
1618
1619 Double_t xyz[3]; // should also get the covariance
3cfaffa4 1620 track->GetXYZ(xyz);
1621 track->Global2LocalPosition(xyz, track->GetAlpha());
1622 points[ip].SetXYZ(xyz[0], xyz[1], xyz[2]);
1bf51039 1623 ip++;
1624 }
3cfaffa4 1625 // printf("plane[%d] tracklet[%p] x[%f]\n", iplane, ptrTracklet, x);
1bf51039 1626
3cfaffa4 1627 // Propagate closer to the next update point
1bf51039 1628 if(((up?-1:1) * (x - track->GetX()) + fgkMaxStep < 0) && !PropagateToX(*track, x + (up?-1:1)*fgkMaxStep, fgkMaxStep)) return -1.;
1629
1630 if(!AdjustSector(track)) return -1;
1631 if(TMath::Abs(track->GetSnp()) > fgkMaxSnp) return -1;
1632
1633 //load tracklet to the tracker and the track
1634/* Int_t index;
1635 if((index = FindTracklet(ptrTracklet)) < 0){
1636 ptrTracklet = SetTracklet(&tracklet);
1637 index = fTracklets->GetEntriesFast()-1;
1638 }
1639 track->SetTracklet(ptrTracklet, index);*/
1640
1641
1642 // register tracklet to track with tracklet creation !!
1643 // PropagateBack : loaded tracklet to the tracker and update index
1644 // RefitInward : update index
1645 // MakeTrack : loaded tracklet to the tracker and update index
1646 if(!tracklets) track->SetTracklet(ptrTracklet, -1);
1647
1648
1649 //Calculate the mean material budget along the path inside the chamber
1650 Double_t xyz0[3]; track->GetXYZ(xyz0);
1651 Double_t alpha = track->GetAlpha();
1652 Double_t xyz1[3], y, z;
1653 if(!track->GetProlongation(x, y, z)) return -1;
1654 xyz1[0] = x * TMath::Cos(alpha) - y * TMath::Sin(alpha);
1655 xyz1[1] = +x * TMath::Sin(alpha) + y * TMath::Cos(alpha);
1656 xyz1[2] = z;
3cfaffa4 1657 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 1658 Double_t param[7];
3cfaffa4 1659 if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param) <=0.) break;
1bf51039 1660 Double_t xrho = param[0]*param[4]; // density*length
1661 Double_t xx0 = param[1]; // radiation length
1662
1663 //Propagate the track
1664 track->PropagateTo(x, xx0, xrho);
1665 if (!AdjustSector(track)) break;
1666
1667 //Update track
b72f4eaf 1668 Double_t cov[3]; ptrTracklet->GetCovAt(x, cov);
1669 Double_t p[2] = { ptrTracklet->GetY(), ptrTracklet->GetZ()};
1670 Double_t chi2 = ((AliExternalTrackParam*)track)->GetPredictedChi2(p, cov);
1671 if(chi2<1e+10) track->Update(p, cov, chi2);
1bf51039 1672 if(!up) continue;
1673
1674 //Reset material budget if 2 consecutive gold
1675 if(iplane>0 && track->GetTracklet(iplane-1) && ptrTracklet->GetN() + track->GetTracklet(iplane-1)->GetN() > 20) track->SetBudget(2, 0.);
1676 } // end planes loop
1677
1678 // extrapolation
1679 while(ip < np){
1680 if(((up?-1:1) * (points[ip].GetX() - track->GetX()) < 0) && !PropagateToX(*track, points[ip].GetX(), fgkMaxStep)) return -1.;
1681
1682 Double_t xyz[3]; // should also get the covariance
3cfaffa4 1683 track->GetXYZ(xyz);
1684 track->Global2LocalPosition(xyz, track->GetAlpha());
1685 points[ip].SetXYZ(xyz[0], xyz[1], xyz[2]);
1bf51039 1686 ip++;
1687 }
1688
1689 return track->GetChi2();
1690}
3b57a3f7 1691
eb38ed55 1692//_________________________________________________________________________
bb56afff 1693Float_t AliTRDtrackerV1::CalculateChi2Z(AliTRDseedV1 *tracklets, Double_t offset, Double_t slope, Double_t xref)
eb38ed55 1694{
41702fec 1695 //
1696 // Calculates the chi2-value of the track in z-Direction including tilting pad correction.
1697 // A linear dependence on the x-value serves as a model.
1698 // The parameters are related to the tilted Riemann fit.
1699 // Parameters: - Array of tracklets (AliTRDseedV1) related to the track candidate
1700 // - the offset for the reference x
1701 // - the slope
1702 // - the reference x position
1703 // Output: - The Chi2 value of the track in z-Direction
1704 //
1705 Float_t chi2Z = 0, nLayers = 0;
053767a4 1706 for (Int_t iLayer = 0; iLayer < AliTRDgeometry::kNlayer; iLayer++) {
41702fec 1707 if(!tracklets[iLayer].IsOK()) continue;
1708 Double_t z = offset + slope * (tracklets[iLayer].GetX0() - xref);
e3cf3d02 1709 chi2Z += TMath::Abs(tracklets[iLayer].GetZfit(0) - z);
41702fec 1710 nLayers++;
1711 }
1712 chi2Z /= TMath::Max((nLayers - 3.0),1.0);
1713 return chi2Z;
eb38ed55 1714}
1715
bccda319 1716//_____________________________________________________________________________
1717Int_t AliTRDtrackerV1::PropagateToX(AliTRDtrackV1 &t, Double_t xToGo, Double_t maxStep)
1718{
41702fec 1719 //
1720 // Starting from current X-position of track <t> this function
1721 // extrapolates the track up to radial position <xToGo>.
1722 // Returns 1 if track reaches the plane, and 0 otherwise
1723 //
bccda319 1724
41702fec 1725 const Double_t kEpsilon = 0.00001;
bccda319 1726
41702fec 1727 // Current track X-position
1728 Double_t xpos = t.GetX();
bccda319 1729
41702fec 1730 // Direction: inward or outward
1731 Double_t dir = (xpos < xToGo) ? 1.0 : -1.0;
bccda319 1732
41702fec 1733 while (((xToGo - xpos) * dir) > kEpsilon) {
bccda319 1734
41702fec 1735 Double_t xyz0[3];
1736 Double_t xyz1[3];
1737 Double_t param[7];
1738 Double_t x;
1739 Double_t y;
1740 Double_t z;
bccda319 1741
41702fec 1742 // The next step size
1743 Double_t step = dir * TMath::Min(TMath::Abs(xToGo-xpos),maxStep);
bccda319 1744
41702fec 1745 // Get the global position of the starting point
1746 t.GetXYZ(xyz0);
bccda319 1747
41702fec 1748 // X-position after next step
1749 x = xpos + step;
bccda319 1750
41702fec 1751 // Get local Y and Z at the X-position of the next step
3352b455 1752 if(t.GetProlongation(x,y,z)<0) return 0; // No prolongation possible
bccda319 1753
41702fec 1754 // The global position of the end point of this prolongation step
1755 xyz1[0] = x * TMath::Cos(t.GetAlpha()) - y * TMath::Sin(t.GetAlpha());
1756 xyz1[1] = +x * TMath::Sin(t.GetAlpha()) + y * TMath::Cos(t.GetAlpha());
1757 xyz1[2] = z;
bccda319 1758
41702fec 1759 // Calculate the mean material budget between start and
1760 // end point of this prolongation step
83dea92e 1761 if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param)<=0.) return 0;
bccda319 1762
41702fec 1763 // Propagate the track to the X-position after the next step
9c87a076 1764 if (!t.PropagateTo(x, param[1], param[0]*param[4])) return 0;
bccda319 1765
41702fec 1766 // Rotate the track if necessary
1767 AdjustSector(&t);
bccda319 1768
41702fec 1769 // New track X-position
1770 xpos = t.GetX();
bccda319 1771
41702fec 1772 }
bccda319 1773
41702fec 1774 return 1;
bccda319 1775
1776}
1777
eb38ed55 1778
1779//_____________________________________________________________________________
1780Int_t AliTRDtrackerV1::ReadClusters(TClonesArray* &array, TTree *clusterTree) const
1781{
41702fec 1782 //
1783 // Reads AliTRDclusters from the file.
1784 // The names of the cluster tree and branches
1785 // should match the ones used in AliTRDclusterizer::WriteClusters()
1786 //
1787
1788 Int_t nsize = Int_t(clusterTree->GetTotBytes() / (sizeof(AliTRDcluster)));
1789 TObjArray *clusterArray = new TObjArray(nsize+1000);
1790
1791 TBranch *branch = clusterTree->GetBranch("TRDcluster");
1792 if (!branch) {
1793 AliError("Can't get the branch !");
1794 return 1;
1795 }
1796 branch->SetAddress(&clusterArray);
1797
1798 if(!fClusters){
8ae98148 1799 Float_t nclusters = fReconstructor->GetRecoParam()->GetNClusters();
1800 if(fReconstructor->IsHLT()) nclusters /= AliTRDgeometry::kNsector;
1801 array = new TClonesArray("AliTRDcluster", Int_t(nclusters));
41702fec 1802 array->SetOwner(kTRUE);
1803 }
1804
1805 // Loop through all entries in the tree
1806 Int_t nEntries = (Int_t) clusterTree->GetEntries();
1807 Int_t nbytes = 0;
1808 Int_t ncl = 0;
1809 AliTRDcluster *c = 0x0;
1810 for (Int_t iEntry = 0; iEntry < nEntries; iEntry++) {
1811 // Import the tree
1812 nbytes += clusterTree->GetEvent(iEntry);
1813
1814 // Get the number of points in the detector
1815 Int_t nCluster = clusterArray->GetEntriesFast();
1816 for (Int_t iCluster = 0; iCluster < nCluster; iCluster++) {
1817 if(!(c = (AliTRDcluster *) clusterArray->UncheckedAt(iCluster))) continue;
41702fec 1818 new((*fClusters)[ncl++]) AliTRDcluster(*c);
1819 delete (clusterArray->RemoveAt(iCluster));
1820 }
1821
1822 }
1823 delete clusterArray;
1824
1825 return 0;
eb38ed55 1826}
1827
1828//_____________________________________________________________________________
1829Int_t AliTRDtrackerV1::LoadClusters(TTree *cTree)
1830{
41702fec 1831 //
66f6bfd9 1832 // Fills clusters into TRD tracking sectors
41702fec 1833 //
41702fec 1834
48f8adf3 1835 if(!fReconstructor->IsWritingClusters()){
1836 fClusters = AliTRDReconstructor::GetClusters();
1837 } else {
66f6bfd9 1838 if (ReadClusters(fClusters, cTree)) {
1839 AliError("Problem with reading the clusters !");
1840 return 1;
1841 }
1842 }
1843 SetClustersOwner();
1844
48f8adf3 1845 if(!fClusters || !fClusters->GetEntriesFast()){
66f6bfd9 1846 AliInfo("No TRD clusters");
41702fec 1847 return 1;
1848 }
66f6bfd9 1849
1850 //Int_t nin =
1851 BuildTrackingContainers();
1852
1853 //Int_t ncl = fClusters->GetEntriesFast();
1854 //AliInfo(Form("Clusters %d [%6.2f %% in the active volume]", ncl, 100.*float(nin)/ncl));
1855
1856 return 0;
1857}
1858
1859//_____________________________________________________________________________
1860Int_t AliTRDtrackerV1::LoadClusters(TClonesArray *clusters)
1861{
1862 //
1863 // Fills clusters into TRD tracking sectors
1864 // Function for use in the HLT
1865
1866 if(!clusters || !clusters->GetEntriesFast()){
1867 AliInfo("No TRD clusters");
41702fec 1868 return 1;
1869 }
1870
66f6bfd9 1871 fClusters = clusters;
1872 SetClustersOwner();
1873
1874 //Int_t nin =
1875 BuildTrackingContainers();
1876
1877 //Int_t ncl = fClusters->GetEntriesFast();
1878 //AliInfo(Form("Clusters %d [%6.2f %% in the active volume]", ncl, 100.*float(nin)/ncl));
1879
1880 return 0;
1881}
1882
1883
1884//____________________________________________________________________
1885Int_t AliTRDtrackerV1::BuildTrackingContainers()
1886{
1887// Building tracking containers for clusters
1888
1889 Int_t nin =0, icl = fClusters->GetEntriesFast();
41702fec 1890 while (icl--) {
1891 AliTRDcluster *c = (AliTRDcluster *) fClusters->UncheckedAt(icl);
1892 if(c->IsInChamber()) nin++;
1893 Int_t detector = c->GetDetector();
1894 Int_t sector = fGeom->GetSector(detector);
053767a4 1895 Int_t stack = fGeom->GetStack(detector);
1896 Int_t layer = fGeom->GetLayer(detector);
41702fec 1897
053767a4 1898 fTrSec[sector].GetChamber(stack, layer, kTRUE)->InsertCluster(c, icl);
41702fec 1899 }
b0a48c4d 1900
1901 const AliTRDCalDet *cal = AliTRDcalibDB::Instance()->GetT0Det();
053767a4 1902 for(int isector =0; isector<AliTRDgeometry::kNsector; isector++){
41702fec 1903 if(!fTrSec[isector].GetNChambers()) continue;
b0a48c4d 1904 fTrSec[isector].Init(fReconstructor, cal);
41702fec 1905 }
66f6bfd9 1906
1907 return nin;
eb38ed55 1908}
1909
1910
66f6bfd9 1911
0906e73e 1912//____________________________________________________________________
172b6f82 1913void AliTRDtrackerV1::UnloadClusters()
0906e73e 1914{
d4cf71ca 1915//
1916// Clears the arrays of clusters and tracks. Resets sectors and timebins
1917// If option "force" is also set the containers are also deleted. This is useful
1918// in case of HLT
1919
1920 if(fTracks){
1921 fTracks->Delete();
172b6f82 1922 if(HasRemoveContainers()){delete fTracks; fTracks = 0x0;}
d4cf71ca 1923 }
1924 if(fTracklets){
1925 fTracklets->Delete();
172b6f82 1926 if(HasRemoveContainers()){delete fTracklets; fTracklets = 0x0;}
d4cf71ca 1927 }
48f8adf3 1928 if(fClusters){
1929 if(IsClustersOwner()) fClusters->Delete();
1930
1931 // save clusters array in the reconstructor for further use.
1932 if(!fReconstructor->IsWritingClusters()){
1933 AliTRDReconstructor::SetClusters(fClusters);
1934 SetClustersOwner(kFALSE);
1935 } else AliTRDReconstructor::SetClusters(0x0);
1936 }
0906e73e 1937
053767a4 1938 for (int i = 0; i < AliTRDgeometry::kNsector; i++) fTrSec[i].Clear();
0906e73e 1939
41702fec 1940 // Increment the Event Number
1941 AliTRDtrackerDebug::SetEventNumber(AliTRDtrackerDebug::GetEventNumber() + 1);
eb38ed55 1942}
0906e73e 1943
fac58f00 1944// //____________________________________________________________________
1945// void AliTRDtrackerV1::UseClusters(const AliKalmanTrack *t, Int_t) const
1946// {
1947// const AliTRDtrackV1 *track = dynamic_cast<const AliTRDtrackV1*>(t);
1948// if(!track) return;
1949//
1950// AliTRDseedV1 *tracklet = 0x0;
1951// for(Int_t ily=AliTRDgeometry::kNlayer; ily--;){
1952// if(!(tracklet = track->GetTracklet(ily))) continue;
1953// AliTRDcluster *c = 0x0;
8d2bec9e 1954// for(Int_t ic=AliTRDseed::kNclusters; ic--;){
fac58f00 1955// if(!(c=tracklet->GetClusters(ic))) continue;
1956// c->Use();
1957// }
1958// }
1959// }
1960//
b1957d3c 1961
eb38ed55 1962//_____________________________________________________________________________
1963Bool_t AliTRDtrackerV1::AdjustSector(AliTRDtrackV1 *track)
1964{
41702fec 1965 //
1966 // Rotates the track when necessary
1967 //
1968
1969 Double_t alpha = AliTRDgeometry::GetAlpha();
1970 Double_t y = track->GetY();
1971 Double_t ymax = track->GetX()*TMath::Tan(0.5*alpha);
3cfaffa4 1972
41702fec 1973 if (y > ymax) {
1974 if (!track->Rotate( alpha)) {
1975 return kFALSE;
1976 }
1977 }
1978 else if (y < -ymax) {
1979 if (!track->Rotate(-alpha)) {
1980 return kFALSE;
1981 }
1982 }
1983
1984 return kTRUE;
0906e73e 1985
1986}
1987
eb38ed55 1988
0906e73e 1989//____________________________________________________________________
1990AliTRDseedV1* AliTRDtrackerV1::GetTracklet(AliTRDtrackV1 *track, Int_t p, Int_t &idx)
1991{
41702fec 1992 // Find tracklet for TRD track <track>
1993 // Parameters
1994 // - track
1995 // - sector
1996 // - plane
1997 // - index
1998 // Output
1999 // tracklet
2000 // index
2001 // Detailed description
2002 //
2003 idx = track->GetTrackletIndex(p);
2004 AliTRDseedV1 *tracklet = (idx==0xffff) ? 0x0 : (AliTRDseedV1*)fTracklets->UncheckedAt(idx);
2005
2006 return tracklet;
0906e73e 2007}
2008
2009//____________________________________________________________________
3b57a3f7 2010AliTRDseedV1* AliTRDtrackerV1::SetTracklet(AliTRDseedV1 *tracklet)
0906e73e 2011{
41702fec 2012 // Add this tracklet to the list of tracklets stored in the tracker
2013 //
2014 // Parameters
2015 // - tracklet : pointer to the tracklet to be added to the list
2016 //
2017 // Output
2018 // - the index of the new tracklet in the tracker tracklets list
2019 //
2020 // Detailed description
2021 // Build the tracklets list if it is not yet created (late initialization)
2022 // and adds the new tracklet to the list.
2023 //
2024 if(!fTracklets){
053767a4 2025 fTracklets = new TClonesArray("AliTRDseedV1", AliTRDgeometry::Nsector()*kMaxTracksStack);
41702fec 2026 fTracklets->SetOwner(kTRUE);
2027 }
2028 Int_t nentries = fTracklets->GetEntriesFast();
2029 return new ((*fTracklets)[nentries]) AliTRDseedV1(*tracklet);
972ef65e 2030}
2031
d20df6fc 2032//____________________________________________________________________
2033AliTRDtrackV1* AliTRDtrackerV1::SetTrack(AliTRDtrackV1 *track)
2034{
2035 // Add this track to the list of tracks stored in the tracker
2036 //
2037 // Parameters
2038 // - track : pointer to the track to be added to the list
2039 //
2040 // Output
2041 // - the pointer added
2042 //
2043 // Detailed description
2044 // Build the tracks list if it is not yet created (late initialization)
2045 // and adds the new track to the list.
2046 //
2047 if(!fTracks){
053767a4 2048 fTracks = new TClonesArray("AliTRDtrackV1", AliTRDgeometry::Nsector()*kMaxTracksStack);
d20df6fc 2049 fTracks->SetOwner(kTRUE);
2050 }
2051 Int_t nentries = fTracks->GetEntriesFast();
2052 return new ((*fTracks)[nentries]) AliTRDtrackV1(*track);
2053}
2054
2055
0906e73e 2056
e4f2f73d 2057//____________________________________________________________________
eb38ed55 2058Int_t AliTRDtrackerV1::Clusters2TracksSM(Int_t sector, AliESDEvent *esd)
e4f2f73d 2059{
41702fec 2060 //
2061 // Steer tracking for one SM.
2062 //
2063 // Parameters :
2064 // sector : Array of (SM) propagation layers containing clusters
2065 // esd : The current ESD event. On output it contains the also
2066 // the ESD (TRD) tracks found in this SM.
2067 //
2068 // Output :
2069 // Number of tracks found in this TRD supermodule.
2070 //
2071 // Detailed description
2072 //
2073 // 1. Unpack AliTRDpropagationLayers objects for each stack.
2074 // 2. Launch stack tracking.
2075 // See AliTRDtrackerV1::Clusters2TracksStack() for details.
2076 // 3. Pack results in the ESD event.
2077 //
2078
2079 // allocate space for esd tracks in this SM
2080 TClonesArray esdTrackList("AliESDtrack", 2*kMaxTracksStack);
2081 esdTrackList.SetOwner();
2082
2083 Int_t nTracks = 0;
2084 Int_t nChambers = 0;
2085 AliTRDtrackingChamber **stack = 0x0, *chamber = 0x0;
053767a4 2086 for(int istack = 0; istack<AliTRDgeometry::kNstack; istack++){
41702fec 2087 if(!(stack = fTrSec[sector].GetStack(istack))) continue;
2088 nChambers = 0;
053767a4 2089 for(int ilayer=0; ilayer<AliTRDgeometry::kNlayer; ilayer++){
2090 if(!(chamber = stack[ilayer])) continue;
3a039a31 2091 if(chamber->GetNClusters() < fgNTimeBins * fReconstructor->GetRecoParam() ->GetFindableClusters()) continue;
41702fec 2092 nChambers++;
053767a4 2093 //AliInfo(Form("sector %d stack %d layer %d clusters %d", sector, istack, ilayer, chamber->GetNClusters()));
41702fec 2094 }
2095 if(nChambers < 4) continue;
2096 //AliInfo(Form("Doing stack %d", istack));
2097 nTracks += Clusters2TracksStack(stack, &esdTrackList);
2098 }
2099 //AliInfo(Form("Found %d tracks in SM %d [%d]\n", nTracks, sector, esd->GetNumberOfTracks()));
2100
2101 for(int itrack=0; itrack<nTracks; itrack++)
2102 esd->AddTrack((AliESDtrack*)esdTrackList[itrack]);
2103
2104 // Reset Track and Candidate Number
2105 AliTRDtrackerDebug::SetCandidateNumber(0);
2106 AliTRDtrackerDebug::SetTrackNumber(0);
2107 return nTracks;
e4f2f73d 2108}
2109
2110//____________________________________________________________________
eb38ed55 2111Int_t AliTRDtrackerV1::Clusters2TracksStack(AliTRDtrackingChamber **stack, TClonesArray *esdTrackList)
e4f2f73d 2112{
41702fec 2113 //
2114 // Make tracks in one TRD stack.
2115 //
2116 // Parameters :
2117 // layer : Array of stack propagation layers containing clusters
2118 // esdTrackList : Array of ESD tracks found by the stand alone tracker.
2119 // On exit the tracks found in this stack are appended.
2120 //
2121 // Output :
2122 // Number of tracks found in this stack.
2123 //
2124 // Detailed description
2125 //
2126 // 1. Find the 3 most useful seeding chambers. See BuildSeedingConfigs() for details.
2127 // 2. Steer AliTRDtrackerV1::MakeSeeds() for 3 seeding layer configurations.
2128 // See AliTRDtrackerV1::MakeSeeds() for more details.
2129 // 3. Arrange track candidates in decreasing order of their quality
2130 // 4. Classify tracks in 5 categories according to:
2131 // a) number of layers crossed
2132 // b) track quality
2133 // 5. Sign clusters by tracks in decreasing order of track quality
2134 // 6. Build AliTRDtrack out of seeding tracklets
2135 // 7. Cook MC label
2136 // 8. Build ESD track and register it to the output list
2137 //
2138
b0a48c4d 2139 const AliTRDCalDet *cal = AliTRDcalibDB::Instance()->GetT0Det();
41702fec 2140 AliTRDtrackingChamber *chamber = 0x0;
fac58f00 2141 AliTRDtrackingChamber **ci = 0x0;
41702fec 2142 AliTRDseedV1 sseed[kMaxTracksStack*6]; // to be initialized
2143 Int_t pars[4]; // MakeSeeds parameters
2144
2145 //Double_t alpha = AliTRDgeometry::GetAlpha();
2146 //Double_t shift = .5 * alpha;
2147 Int_t configs[kNConfigs];
2148
fac58f00 2149 // Purge used clusters from the containers
2150 ci = &stack[0];
2151 for(Int_t ic = kNPlanes; ic--; ci++){
2152 if(!(*ci)) continue;
2153 (*ci)->Update();
2154 }
2155
41702fec 2156 // Build initial seeding configurations
2157 Double_t quality = BuildSeedingConfigs(stack, configs);
eb2b4f91 2158 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 10){
41702fec 2159 AliInfo(Form("Plane config %d %d %d Quality %f"
2160 , configs[0], configs[1], configs[2], quality));
2161 }
d931f2aa 2162
41702fec 2163
2164 // Initialize contors
2165 Int_t ntracks, // number of TRD track candidates
2166 ntracks1, // number of registered TRD tracks/iter
2167 ntracks2 = 0; // number of all registered TRD tracks in stack
2168 fSieveSeeding = 0;
d931f2aa 2169
2170 // Get stack index
fac58f00 2171 Int_t ic = 0; ci = &stack[0];
2172 while(ic<kNPlanes && !(*ci)){ic++; ci++;}
2173 if(!(*ci)) return ntracks2;
2174 Int_t istack = fGeom->GetStack((*ci)->GetDetector());
d931f2aa 2175
41702fec 2176 do{
2177 // Loop over seeding configurations
2178 ntracks = 0; ntracks1 = 0;
2179 for (Int_t iconf = 0; iconf<3; iconf++) {
2180 pars[0] = configs[iconf];
2181 pars[1] = ntracks;
d931f2aa 2182 pars[2] = istack;
41702fec 2183 ntracks = MakeSeeds(stack, &sseed[6*ntracks], pars);
6e39bde4 2184 //AliInfo(Form("Number of Tracks after iteration step %d: %d\n", iconf, ntracks));
41702fec 2185 if(ntracks == kMaxTracksStack) break;
2186 }
6e39bde4 2187 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1) AliInfo(Form("Candidate TRD tracks %d in iteration %d.", ntracks, fSieveSeeding));
41702fec 2188
2189 if(!ntracks) break;
2190
2191 // Sort the seeds according to their quality
2192 Int_t sort[kMaxTracksStack];
2193 TMath::Sort(ntracks, fTrackQuality, sort, kTRUE);
2194
2195 // Initialize number of tracks so far and logic switches
2196 Int_t ntracks0 = esdTrackList->GetEntriesFast();
2197 Bool_t signedTrack[kMaxTracksStack];
2198 Bool_t fakeTrack[kMaxTracksStack];
2199 for (Int_t i=0; i<ntracks; i++){
2200 signedTrack[i] = kFALSE;
2201 fakeTrack[i] = kFALSE;
2202 }
2203 //AliInfo("Selecting track candidates ...");
2204
2205 // Sieve clusters in decreasing order of track quality
2206 Double_t trackParams[7];
2207 // AliTRDseedV1 *lseed = 0x0;
2208 Int_t jSieve = 0, candidates;
2209 do{
2210 //AliInfo(Form("\t\tITER = %i ", jSieve));
2211
2212 // Check track candidates
2213 candidates = 0;
2214 for (Int_t itrack = 0; itrack < ntracks; itrack++) {
804bb02e 2215 Int_t trackIndex = sort[itrack];
2216 if (signedTrack[trackIndex] || fakeTrack[trackIndex]) continue;
41702fec 2217
2218
804bb02e 2219 // Calculate track parameters from tracklets seeds
804bb02e 2220 Int_t ncl = 0;
2221 Int_t nused = 0;
2222 Int_t nlayers = 0;
2223 Int_t findable = 0;
2224 for (Int_t jLayer = 0; jLayer < kNPlanes; jLayer++) {
2225 Int_t jseed = kNPlanes*trackIndex+jLayer;
2226 if(!sseed[jseed].IsOK()) continue;
f29f13a6 2227 if (TMath::Abs(sseed[jseed].GetYref(0) / sseed[jseed].GetX0()) < 0.158) findable++;
eede7907 2228 // TODO here we get a sig fault which should never happen !
804bb02e 2229 sseed[jseed].UpdateUsed();
2230 ncl += sseed[jseed].GetN2();
2231 nused += sseed[jseed].GetNUsed();
2232 nlayers++;
804bb02e 2233 }
2234
f29f13a6 2235 // Filter duplicated tracks
2236 if (nused > 30){
2237 //printf("Skip %d nused %d\n", trackIndex, nused);
2238 fakeTrack[trackIndex] = kTRUE;
2239 continue;
2240 }
2241 if (Float_t(nused)/ncl >= .25){
2242 //printf("Skip %d nused/ncl >= .25\n", trackIndex);
2243 fakeTrack[trackIndex] = kTRUE;
2244 continue;
2245 }
41702fec 2246
f29f13a6 2247 // Classify tracks
2248 Bool_t skip = kFALSE;
2249 switch(jSieve){
2250 case 0:
2251 if(nlayers < 6) {skip = kTRUE; break;}
2252 if(TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -5.){skip = kTRUE; break;}
2253 break;
2254
2255 case 1:
2256 if(nlayers < findable){skip = kTRUE; break;}
2257 if(TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -4.){skip = kTRUE; break;}
2258 break;
2259
2260 case 2:
2261 if ((nlayers == findable) || (nlayers == 6)) { skip = kTRUE; break;}
2262 if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -6.0){skip = kTRUE; break;}
2263 break;
2264
2265 case 3:
2266 if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -5.){skip = kTRUE; break;}
2267 break;
2268
2269 case 4:
2270 if (nlayers == 3){skip = kTRUE; break;}
2271 //if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) - nused/(nlayers-3.0) < -15.0){skip = kTRUE; break;}
2272 break;
2273 }
2274 if(skip){
2275 candidates++;
2276 //printf("REJECTED : %d [%d] nlayers %d trackQuality = %e nused %d\n", itrack, trackIndex, nlayers, fTrackQuality[trackIndex], nused);
2277 continue;
2278 }
2279 signedTrack[trackIndex] = kTRUE;
2280
2281 // Build track parameters
2282 AliTRDseedV1 *lseed =&sseed[trackIndex*6];
2283 /* Int_t idx = 0;
2284 while(idx<3 && !lseed->IsOK()) {
2285 idx++;
2286 lseed++;
2287 }*/
2288 Double_t x = lseed->GetX0();// - 3.5;
2289 trackParams[0] = x; //NEW AB
2290 trackParams[1] = lseed->GetYref(0); // lseed->GetYat(x);
2291 trackParams[2] = lseed->GetZref(0); // lseed->GetZat(x);
2292 trackParams[3] = TMath::Sin(TMath::ATan(lseed->GetYref(1)));
2293 trackParams[4] = lseed->GetZref(1) / TMath::Sqrt(1. + lseed->GetYref(1) * lseed->GetYref(1));
2294 trackParams[5] = lseed->GetC();
2295 Int_t ich = 0; while(!(chamber = stack[ich])) ich++;
2296 trackParams[6] = fGeom->GetSector(chamber->GetDetector());/* *alpha+shift; // Supermodule*/
2297
2298 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){
eb2b4f91 2299 //AliInfo(Form("Track %d [%d] nlayers %d trackQuality = %e nused %d, yref = %3.3f", itrack, trackIndex, nlayers, fTrackQuality[trackIndex], nused, trackParams[1]));
f29f13a6 2300
f29f13a6 2301 AliTRDseedV1 *dseed[6];
b82b4de1 2302 for(Int_t iseed = AliTRDgeometry::kNlayer; iseed--;) dseed[iseed] = new AliTRDseedV1(lseed[iseed]);
f29f13a6 2303
2304 //Int_t eventNrInFile = esd->GetEventNumberInFile();
f29f13a6 2305 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2306 Int_t trackNumber = AliTRDtrackerDebug::GetTrackNumber();
2307 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2308 TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
2309 cstreamer << "Clusters2TracksStack"
2310 << "EventNumber=" << eventNumber
2311 << "TrackNumber=" << trackNumber
2312 << "CandidateNumber=" << candidateNumber
2313 << "Iter=" << fSieveSeeding
2314 << "Like=" << fTrackQuality[trackIndex]
2315 << "S0.=" << dseed[0]
2316 << "S1.=" << dseed[1]
2317 << "S2.=" << dseed[2]
2318 << "S3.=" << dseed[3]
2319 << "S4.=" << dseed[4]
2320 << "S5.=" << dseed[5]
2321 << "p0=" << trackParams[0]
2322 << "p1=" << trackParams[1]
2323 << "p2=" << trackParams[2]
2324 << "p3=" << trackParams[3]
2325 << "p4=" << trackParams[4]
2326 << "p5=" << trackParams[5]
2327 << "p6=" << trackParams[6]
f29f13a6 2328 << "Ncl=" << ncl
2329 << "NLayers=" << nlayers
2330 << "Findable=" << findable
2331 << "NUsed=" << nused
2332 << "\n";
2333 }
d877f55f 2334
f29f13a6 2335 AliTRDtrackV1 *track = MakeTrack(&sseed[trackIndex*kNPlanes], trackParams);
2336 if(!track){
2337 AliWarning("Fail to build a TRD Track.");
2338 continue;
d877f55f 2339 }
41702fec 2340
f29f13a6 2341 //AliInfo("End of MakeTrack()");
2342 AliESDtrack *esdTrack = new ((*esdTrackList)[ntracks0++]) AliESDtrack();
2343 esdTrack->UpdateTrackParams(track, AliESDtrack::kTRDout);
2344 esdTrack->SetLabel(track->GetLabel());
2345 track->UpdateESDtrack(esdTrack);
2346 // write ESD-friends if neccessary
2347 if (fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 0){
2348 AliTRDtrackV1 *calibTrack = new AliTRDtrackV1(*track);
2349 calibTrack->SetOwner();
2350 esdTrack->AddCalibObject(calibTrack);
2351 }
2352 ntracks1++;
2353 AliTRDtrackerDebug::SetTrackNumber(AliTRDtrackerDebug::GetTrackNumber() + 1);
41702fec 2354 }
2355
2356 jSieve++;
2357 } while(jSieve<5 && candidates); // end track candidates sieve
2358 if(!ntracks1) break;
2359
2360 // increment counters
2361 ntracks2 += ntracks1;
4302c900 2362
2363 if(fReconstructor->IsHLT()) break;
41702fec 2364 fSieveSeeding++;
2365
2366 // Rebuild plane configurations and indices taking only unused clusters into account
2367 quality = BuildSeedingConfigs(stack, configs);
3a039a31 2368 if(quality < 1.E-7) break; //fReconstructor->GetRecoParam() ->GetPlaneQualityThreshold()) break;
41702fec 2369
2370 for(Int_t ip = 0; ip < kNPlanes; ip++){
2371 if(!(chamber = stack[ip])) continue;
b0a48c4d 2372 chamber->Build(fGeom, cal);//Indices(fSieveSeeding);
41702fec 2373 }
2374
eb2b4f91 2375 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 10){
41702fec 2376 AliInfo(Form("Sieve level %d Plane config %d %d %d Quality %f", fSieveSeeding, configs[0], configs[1], configs[2], quality));
2377 }
2378 } while(fSieveSeeding<10); // end stack clusters sieve
2379
2380
2381
2382 //AliInfo(Form("Registered TRD tracks %d in stack %d.", ntracks2, pars[1]));
2383
2384 return ntracks2;
e4f2f73d 2385}
2386
2387//___________________________________________________________________
eb38ed55 2388Double_t AliTRDtrackerV1::BuildSeedingConfigs(AliTRDtrackingChamber **stack, Int_t *configs)
e4f2f73d 2389{
41702fec 2390 //
2391 // Assign probabilities to chambers according to their
2392 // capability of producing seeds.
2393 //
2394 // Parameters :
2395 //
2396 // layers : Array of stack propagation layers for all 6 chambers in one stack
2397 // configs : On exit array of configuration indexes (see GetSeedingConfig()
2398 // for details) in the decreasing order of their seeding probabilities.
2399 //
2400 // Output :
2401 //
2402 // Return top configuration quality
2403 //
2404 // Detailed description:
2405 //
2406 // To each chamber seeding configuration (see GetSeedingConfig() for
2407 // the list of all configurations) one defines 2 quality factors:
2408 // - an apriori topological quality (see GetSeedingConfig() for details) and
2409 // - a data quality based on the uniformity of the distribution of
2410 // clusters over the x range (time bins population). See CookChamberQA() for details.
2411 // The overall chamber quality is given by the product of this 2 contributions.
2412 //
2413
eb2b4f91 2414 Double_t chamberQ[kNPlanes];memset(chamberQ, 0, kNPlanes*sizeof(Double_t));
41702fec 2415 AliTRDtrackingChamber *chamber = 0x0;
2416 for(int iplane=0; iplane<kNPlanes; iplane++){
2417 if(!(chamber = stack[iplane])) continue;
2418 chamberQ[iplane] = (chamber = stack[iplane]) ? chamber->GetQuality() : 0.;
2419 }
2420
eb2b4f91 2421 Double_t tconfig[kNConfigs];memset(tconfig, 0, kNConfigs*sizeof(Double_t));
2422 Int_t planes[] = {0, 0, 0, 0};
41702fec 2423 for(int iconf=0; iconf<kNConfigs; iconf++){
2424 GetSeedingConfig(iconf, planes);
2425 tconfig[iconf] = fgTopologicQA[iconf];
2426 for(int iplane=0; iplane<4; iplane++) tconfig[iconf] *= chamberQ[planes[iplane]];
2427 }
2428
2429 TMath::Sort((Int_t)kNConfigs, tconfig, configs, kTRUE);
2430 // AliInfo(Form("q[%d] = %f", configs[0], tconfig[configs[0]]));
2431 // AliInfo(Form("q[%d] = %f", configs[1], tconfig[configs[1]]));
2432 // AliInfo(Form("q[%d] = %f", configs[2], tconfig[configs[2]]));
2433
2434 return tconfig[configs[0]];
e4f2f73d 2435}
2436
2437//____________________________________________________________________
eb38ed55 2438Int_t AliTRDtrackerV1::MakeSeeds(AliTRDtrackingChamber **stack, AliTRDseedV1 *sseed, Int_t *ipar)
e4f2f73d 2439{
afa21247 2440//
2a3191bb 2441// Seed tracklets and build candidate TRD tracks. The procedure is used during barrel tracking to account for tracks which are
2442// either missed by TPC prolongation or conversions inside the TRD volume.
2443// For stand alone tracking the procedure is used to estimate all tracks measured by TRD.
afa21247 2444//
2445// Parameters :
2446// layers : Array of stack propagation layers containing clusters
2447// sseed : Array of empty tracklet seeds. On exit they are filled.
2448// ipar : Control parameters:
2449// ipar[0] -> seeding chambers configuration
2450// ipar[1] -> stack index
2451// ipar[2] -> number of track candidates found so far
2452//
2453// Output :
2454// Number of tracks candidates found.
2455//
2456// The following steps are performed:
2457// 1. Build seeding layers by collapsing all time bins from each of the four seeding chambers along the
2458// radial coordinate. See AliTRDtrackingChamber::GetSeedingLayer() for details. The chambers selection for seeding
2459// is described in AliTRDtrackerV1::Clusters2TracksStack().
2460// 2. Using the seeding clusters from the seeding layer (step 1) build combinatorics using the following algorithm:
2461// - for each seeding cluster in the lower seeding layer find
2462// - all seeding clusters in the upper seeding layer inside a road defined by a given phi angle. The angle
2463// is calculated on the minimum pt of tracks from vertex accesible to the stand alone tracker.
2464// - for each pair of two extreme seeding clusters select middle upper cluster using roads defined externally by the
2465// reco params
2466// - select last seeding cluster as the nearest to the linear approximation of the track described by the first three
2467// seeding clusters.
2468// The implementation of road calculation and cluster selection can be found in the functions AliTRDchamberTimeBin::BuildCond()
2469// and AliTRDchamberTimeBin::GetClusters().
2470// 3. Helix fit of the seeding clusters set. (see AliTRDtrackerFitter::FitRieman(AliTRDcluster**)). No tilt correction is
2471// performed at this level
2472// 4. Initialize seeding tracklets in the seeding chambers.
2473// 5. *Filter 0* Chi2 cut on the Y and Z directions. The threshold is set externally by the reco params.
2474// 6. Attach (true) clusters to seeding tracklets (see AliTRDseedV1::AttachClusters()) and fit tracklet (see
2475// AliTRDseedV1::Fit()). The number of used clusters used by current seeds should not exceed ... (25).
2476// 7. *Filter 1* Check if all 4 seeding tracklets are correctly constructed.
2477// 8. Helix fit of the clusters from the seeding tracklets with tilt correction. Refit tracklets using the new
2478// approximation of the track.
2479// 9. *Filter 2* Calculate likelihood of the track. (See AliTRDtrackerV1::CookLikelihood()). The following quantities are
2480// checked against the Riemann fit:
2481// - position resolution in y
2482// - angular resolution in the bending plane
2483// - likelihood of the number of clusters attached to the tracklet
2484// 10. Extrapolation of the helix fit to the other 2 chambers *non seeding* chambers:
2485// - Initialization of extrapolation tracklets with the fit parameters
2486// - Attach clusters to extrapolated tracklets
2487// - Helix fit of tracklets
2488// 11. Improve seeding tracklets quality by reassigning clusters based on the last parameters of the track
2489// See AliTRDtrackerV1::ImproveSeedQuality() for details.
2490// 12. Helix fit of all 6 seeding tracklets and chi2 calculation
2491// 13. Hyperplane fit and track quality calculation. See AliTRDtrackerFitter::FitHyperplane() for details.
2492// 14. Cooking labels for tracklets. Should be done only for MC
2493// 15. Register seeds.
2494//
2495// Authors:
2496// Marian Ivanov <M.Ivanov@gsi.de>
2497// Alexandru Bercuci <A.Bercuci@gsi.de>
2498// Markus Fasel <M.Fasel@gsi.de>
41702fec 2499
2500 AliTRDtrackingChamber *chamber = 0x0;
be24510a 2501 AliTRDcluster *c[kNSeedPlanes] = {0x0, 0x0, 0x0, 0x0}; // initilize seeding clusters
41702fec 2502 AliTRDseedV1 *cseed = &sseed[0]; // initialize tracklets for first track
2503 Int_t ncl, mcl; // working variable for looping over clusters
2504 Int_t index[AliTRDchamberTimeBin::kMaxClustersLayer], jndex[AliTRDchamberTimeBin::kMaxClustersLayer];
2505 // chi2 storage
2506 // chi2[0] = tracklet chi2 on the Z direction
2507 // chi2[1] = tracklet chi2 on the R direction
2508 Double_t chi2[4];
2509
afa21247 2510 // this should be data member of AliTRDtrack TODO
41702fec 2511 Double_t seedQuality[kMaxTracksStack];
2512
2513 // unpack control parameters
2514 Int_t config = ipar[0];
2515 Int_t ntracks = ipar[1];
d931f2aa 2516 Int_t istack = ipar[2];
41702fec 2517 Int_t planes[kNSeedPlanes]; GetSeedingConfig(config, planes);
afa21247 2518 Int_t planesExt[kNPlanes-kNSeedPlanes]; GetExtrapolationConfig(config, planesExt);
be24510a 2519
2520
41702fec 2521 // Init chambers geometry
41702fec 2522 Double_t hL[kNPlanes]; // Tilting angle
2523 Float_t padlength[kNPlanes]; // pad lenghts
dd8059a8 2524 Float_t padwidth[kNPlanes]; // pad widths
41702fec 2525 AliTRDpadPlane *pp = 0x0;
2526 for(int iplane=0; iplane<kNPlanes; iplane++){
2527 pp = fGeom->GetPadPlane(iplane, istack);
bb79ccd5 2528 hL[iplane] = TMath::Tan(TMath::DegToRad()*pp->GetTiltingAngle());
41702fec 2529 padlength[iplane] = pp->GetLengthIPad();
dd8059a8 2530 padwidth[iplane] = pp->GetWidthIPad();
41702fec 2531 }
2532
eb2b4f91 2533 // Init anode wire position for chambers
e165b64b 2534 Double_t x0[kNPlanes], // anode wire position
eb2b4f91 2535 driftLength = .5*AliTRDgeometry::AmThick() - AliTRDgeometry::DrThick(); // drift length
2536 TGeoHMatrix *matrix = 0x0;
2537 Double_t loc[] = {AliTRDgeometry::AnodePos(), 0., 0.};
2538 Double_t glb[] = {0., 0., 0.};
2539 AliTRDtrackingChamber **cIter = &stack[0];
a3743898 2540 for(int iLayer=0; iLayer<kNPlanes; iLayer++,cIter++){
eb2b4f91 2541 if(!(*cIter)) continue;
e165b64b 2542 if(!(matrix = fGeom->GetClusterMatrix((*cIter)->GetDetector()))){
2543 continue;
2544 x0[iLayer] = fgkX0[iLayer];
2545 }
eb2b4f91 2546 matrix->LocalToMaster(loc, glb);
2547 x0[iLayer] = glb[0];
2548 }
2549
6e39bde4 2550 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 2){
41702fec 2551 AliInfo(Form("Making seeds Stack[%d] Config[%d] Tracks[%d]...", istack, config, ntracks));
2552 }
2553
d931f2aa 2554 // Build seeding layers
d611c74f 2555 ResetSeedTB();
41702fec 2556 Int_t nlayers = 0;
41702fec 2557 for(int isl=0; isl<kNSeedPlanes; isl++){
2558 if(!(chamber = stack[planes[isl]])) continue;
3a039a31 2559 if(!chamber->GetSeedingLayer(fSeedTB[isl], fGeom, fReconstructor)) continue;
41702fec 2560 nlayers++;
41702fec 2561 }
eb2b4f91 2562 if(nlayers < kNSeedPlanes) return ntracks;
41702fec 2563
2564
2565 // Start finding seeds
2566 Double_t cond0[4], cond1[4], cond2[4];
2567 Int_t icl = 0;
d611c74f 2568 while((c[3] = (*fSeedTB[3])[icl++])){
41702fec 2569 if(!c[3]) continue;
d611c74f 2570 fSeedTB[0]->BuildCond(c[3], cond0, 0);
2571 fSeedTB[0]->GetClusters(cond0, index, ncl);
41702fec 2572 //printf("Found c[3] candidates 0 %d\n", ncl);
2573 Int_t jcl = 0;
2574 while(jcl<ncl) {
d611c74f 2575 c[0] = (*fSeedTB[0])[index[jcl++]];
41702fec 2576 if(!c[0]) continue;
2577 Double_t dx = c[3]->GetX() - c[0]->GetX();
afa21247 2578 Double_t dzdx = (c[3]->GetZ() - c[0]->GetZ())/dx;
2579 Double_t dydx = (c[3]->GetY() - c[0]->GetY())/dx;
2580 fSeedTB[1]->BuildCond(c[0], cond1, 1, dzdx, dydx);
d611c74f 2581 fSeedTB[1]->GetClusters(cond1, jndex, mcl);
41702fec 2582 //printf("Found c[0] candidates 1 %d\n", mcl);
2583
2584 Int_t kcl = 0;
2585 while(kcl<mcl) {
d611c74f 2586 c[1] = (*fSeedTB[1])[jndex[kcl++]];
2587 if(!c[1]) continue;
afa21247 2588 fSeedTB[2]->BuildCond(c[1], cond2, 2, dzdx, dydx);
d611c74f 2589 c[2] = fSeedTB[2]->GetNearestCluster(cond2);
2590 //printf("Found c[1] candidate 2 %p\n", c[2]);
2591 if(!c[2]) continue;
2592
6e39bde4 2593 //AliInfo("Seeding clusters found. Building seeds ...");
2594 //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());
d611c74f 2595
804bb02e 2596 for (Int_t il = 0; il < kNPlanes; il++) cseed[il].Reset();
41702fec 2597
d611c74f 2598 FitRieman(c, chi2);
2599
d931f2aa 2600 AliTRDseedV1 *tseed = &cseed[0];
bb2db46c 2601 cIter = &stack[0];
2602 for(int iLayer=0; iLayer<kNPlanes; iLayer++, tseed++, cIter++){
2603 Int_t det = (*cIter) ? (*cIter)->GetDetector() : -1;
eb2b4f91 2604 tseed->SetDetector(det);
43d6ad34 2605 tseed->SetTilt(hL[iLayer]);
2606 tseed->SetPadLength(padlength[iLayer]);
dd8059a8 2607 tseed->SetPadWidth(padwidth[iLayer]);
3a039a31 2608 tseed->SetReconstructor(fReconstructor);
eb2b4f91 2609 tseed->SetX0(det<0 ? fR[iLayer]+driftLength : x0[iLayer]);
d611c74f 2610 tseed->Init(GetRiemanFitter());
f29f13a6 2611 tseed->SetStandAlone(kTRUE);
d611c74f 2612 }
2613
2614 Bool_t isFake = kFALSE;
3a039a31 2615 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){
d611c74f 2616 if (c[0]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
2617 if (c[1]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
2618 if (c[2]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
2619
2620 Double_t xpos[4];
2621 for(Int_t l = 0; l < kNSeedPlanes; l++) xpos[l] = fSeedTB[l]->GetX();
2622 Float_t yref[4];
2623 for(int il=0; il<4; il++) yref[il] = cseed[planes[il]].GetYref(0);
2624 Int_t ll = c[3]->GetLabel(0);
2625 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2626 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2627 AliRieman *rim = GetRiemanFitter();
29f95561 2628 TTreeSRedirector &cs0 = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
d611c74f 2629 cs0 << "MakeSeeds0"
2630 <<"EventNumber=" << eventNumber
2631 <<"CandidateNumber=" << candidateNumber
2632 <<"isFake=" << isFake
2633 <<"config=" << config
2634 <<"label=" << ll
2635 <<"chi2z=" << chi2[0]
2636 <<"chi2y=" << chi2[1]
2637 <<"Y2exp=" << cond2[0]
2638 <<"Z2exp=" << cond2[1]
2639 <<"X0=" << xpos[0] //layer[sLayer]->GetX()
2640 <<"X1=" << xpos[1] //layer[sLayer + 1]->GetX()
2641 <<"X2=" << xpos[2] //layer[sLayer + 2]->GetX()
2642 <<"X3=" << xpos[3] //layer[sLayer + 3]->GetX()
2643 <<"yref0=" << yref[0]
2644 <<"yref1=" << yref[1]
2645 <<"yref2=" << yref[2]
2646 <<"yref3=" << yref[3]
2647 <<"c0.=" << c[0]
2648 <<"c1.=" << c[1]
2649 <<"c2.=" << c[2]
2650 <<"c3.=" << c[3]
2651 <<"Seed0.=" << &cseed[planes[0]]
2652 <<"Seed1.=" << &cseed[planes[1]]
2653 <<"Seed2.=" << &cseed[planes[2]]
2654 <<"Seed3.=" << &cseed[planes[3]]
2655 <<"RiemanFitter.=" << rim
2656 <<"\n";
2657 }
3a039a31 2658 if(chi2[0] > fReconstructor->GetRecoParam() ->GetChi2Z()/*7./(3. - sLayer)*//*iter*/){
6e39bde4 2659 //AliInfo(Form("Failed chi2 filter on chi2Z [%f].", chi2[0]));
d611c74f 2660 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2661 continue;
2662 }
3a039a31 2663 if(chi2[1] > fReconstructor->GetRecoParam() ->GetChi2Y()/*1./(3. - sLayer)*//*iter*/){
6e39bde4 2664 //AliInfo(Form("Failed chi2 filter on chi2Y [%f].", chi2[1]));
d611c74f 2665 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2666 continue;
2667 }
2668 //AliInfo("Passed chi2 filter.");
2669
2670 // try attaching clusters to tracklets
6e39bde4 2671 Int_t mlayers = 0;
2672 AliTRDcluster *cl = NULL;
be24510a 2673 for(int iLayer=0; iLayer<kNSeedPlanes; iLayer++){
d611c74f 2674 Int_t jLayer = planes[iLayer];
6e39bde4 2675 Int_t nNotInChamber = 0;
f29f13a6 2676 if(!cseed[jLayer].AttachClusters(stack[jLayer], kTRUE)) continue;
6e39bde4 2677 cseed[jLayer].Fit();
f29f13a6 2678 cseed[jLayer].UpdateUsed();
6e39bde4 2679 cseed[jLayer].ResetClusterIter();
2680 while((cl = cseed[jLayer].NextCluster())){
2681 if(!cl->IsInChamber()) nNotInChamber++;
2682 }
2683 //printf("clusters[%d], used[%d], not in chamber[%d]\n", cseed[jLayer].GetN(), cseed[jLayer].GetNUsed(), nNotInChamber);
2684 if(cseed[jLayer].GetN() - (cseed[jLayer].GetNUsed() + nNotInChamber) < 5) continue; // checking for Cluster which are not in chamber is a much stronger restriction on real data
d611c74f 2685 mlayers++;
2686 }
be24510a 2687
2688 if(mlayers < kNSeedPlanes){
2689 //AliInfo(Form("Failed updating all seeds %d [%d].", mlayers, kNSeedPlanes));
2690 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2691 continue;
2692 }
2693
2694 // temporary exit door for the HLT
4302c900 2695 if(fReconstructor->IsHLT()){
be24510a 2696 // attach clusters to extrapolation chambers
2697 for(int iLayer=0; iLayer<kNPlanes-kNSeedPlanes; iLayer++){
2698 Int_t jLayer = planesExt[iLayer];
2699 if(!(chamber = stack[jLayer])) continue;
f29f13a6 2700 cseed[jLayer].AttachClusters(chamber, kTRUE);
6e39bde4 2701 cseed[jLayer].Fit();
be24510a 2702 }
4302c900 2703 fTrackQuality[ntracks] = 1.; // dummy value
2704 ntracks++;
218ba867 2705 if(ntracks == kMaxTracksStack) return ntracks;
4302c900 2706 cseed += 6;
2707 continue;
2708 }
2709
be24510a 2710
f29f13a6 2711 // Update Seeds and calculate Likelihood
d611c74f 2712 // fit tracklets and cook likelihood
f29f13a6 2713 FitTiltedRieman(&cseed[0], kTRUE);
2714 for(int iLayer=0; iLayer<kNSeedPlanes; iLayer++){
2715 Int_t jLayer = planes[iLayer];
2716 cseed[jLayer].Fit(kTRUE);
2717 }
91834b8d 2718 Double_t like = CookLikelihood(&cseed[0], planes); // to be checked
d611c74f 2719
3a039a31 2720 if (TMath::Log(1.E-9 + like) < fReconstructor->GetRecoParam() ->GetTrackLikelihood()){
d611c74f 2721 //AliInfo(Form("Failed likelihood %f[%e].", TMath::Log(1.E-9 + like), like));
2722 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2723 continue;
2724 }
2725 //AliInfo(Form("Passed likelihood %f[%e].", TMath::Log(1.E-9 + like), like));
2726
2727 // book preliminary results
2728 seedQuality[ntracks] = like;
2729 fSeedLayer[ntracks] = config;/*sLayer;*/
2730
2731 // attach clusters to the extrapolation seeds
be24510a 2732 for(int iLayer=0; iLayer<kNPlanes-kNSeedPlanes; iLayer++){
2733 Int_t jLayer = planesExt[iLayer];
d611c74f 2734 if(!(chamber = stack[jLayer])) continue;
d611c74f 2735
2736 // fit extrapolated seed
2737 if ((jLayer == 0) && !(cseed[1].IsOK())) continue;
2738 if ((jLayer == 5) && !(cseed[4].IsOK())) continue;
2739 AliTRDseedV1 pseed = cseed[jLayer];
f29f13a6 2740 if(!pseed.AttachClusters(chamber, kTRUE)) continue;
2741 pseed.Fit(kTRUE);
d611c74f 2742 cseed[jLayer] = pseed;
d611c74f 2743 FitTiltedRieman(cseed, kTRUE);
f29f13a6 2744 cseed[jLayer].Fit(kTRUE);
d611c74f 2745 }
2746
2747 // AliInfo("Extrapolation done.");
2748 // Debug Stream containing all the 6 tracklets
3a039a31 2749 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){
29f95561 2750 TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
d611c74f 2751 TLinearFitter *tiltedRieman = GetTiltedRiemanFitter();
2752 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2753 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2754 cstreamer << "MakeSeeds1"
2755 << "EventNumber=" << eventNumber
2756 << "CandidateNumber=" << candidateNumber
2757 << "S0.=" << &cseed[0]
2758 << "S1.=" << &cseed[1]
2759 << "S2.=" << &cseed[2]
2760 << "S3.=" << &cseed[3]
2761 << "S4.=" << &cseed[4]
2762 << "S5.=" << &cseed[5]
2763 << "FitterT.=" << tiltedRieman
2764 << "\n";
2765 }
2766
b72f4eaf 2767 if(fReconstructor->HasImproveTracklets() && ImproveSeedQuality(stack, cseed) < 4){
d611c74f 2768 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2769 continue;
2770 }
2771 //AliInfo("Improve seed quality done.");
2772
2773 // fit full track and cook likelihoods
2774 // Double_t curv = FitRieman(&cseed[0], chi2);
2775 // Double_t chi2ZF = chi2[0] / TMath::Max((mlayers - 3.), 1.);
2776 // Double_t chi2RF = chi2[1] / TMath::Max((mlayers - 3.), 1.);
2777
2778 // do the final track fitting (Once with vertex constraint and once without vertex constraint)
2779 Double_t chi2Vals[3];
6e39bde4 2780 chi2Vals[0] = FitTiltedRieman(&cseed[0], kTRUE);
b72f4eaf 2781 if(fReconstructor->HasVertexConstrained())
d611c74f 2782 chi2Vals[1] = FitTiltedRiemanConstraint(&cseed[0], GetZ()); // Do Vertex Constrained fit if desired
2783 else
2784 chi2Vals[1] = 1.;
2785 chi2Vals[2] = GetChi2Z(&cseed[0]) / TMath::Max((mlayers - 3.), 1.);
2786 // Chi2 definitions in testing stage
2787 //chi2Vals[2] = GetChi2ZTest(&cseed[0]);
2788 fTrackQuality[ntracks] = CalculateTrackLikelihood(&cseed[0], &chi2Vals[0]);
2789 //AliInfo("Hyperplane fit done\n");
fac58f00 2790
3a039a31 2791 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){
29f95561 2792 TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
d611c74f 2793 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2794 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2795 TLinearFitter *fitterTC = GetTiltedRiemanFitterConstraint();
2796 TLinearFitter *fitterT = GetTiltedRiemanFitter();
91834b8d 2797 Int_t ncls = 0;
2798 for(Int_t iseed = 0; iseed < kNPlanes; iseed++){
2799 ncls += cseed[iseed].IsOK() ? cseed[iseed].GetN2() : 0;
2800 }
d611c74f 2801 cstreamer << "MakeSeeds2"
2802 << "EventNumber=" << eventNumber
2803 << "CandidateNumber=" << candidateNumber
2804 << "Chi2TR=" << chi2Vals[0]
2805 << "Chi2TC=" << chi2Vals[1]
2806 << "Nlayers=" << mlayers
91834b8d 2807 << "NClusters=" << ncls
d611c74f 2808 << "Like=" << like
2809 << "S0.=" << &cseed[0]
2810 << "S1.=" << &cseed[1]
2811 << "S2.=" << &cseed[2]
2812 << "S3.=" << &cseed[3]
2813 << "S4.=" << &cseed[4]
2814 << "S5.=" << &cseed[5]
d611c74f 2815 << "FitterT.=" << fitterT
2816 << "FitterTC.=" << fitterTC
2817 << "\n";
2818 }
2819
2820 ntracks++;
2821 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2822 if(ntracks == kMaxTracksStack){
2823 AliWarning(Form("Number of seeds reached maximum allowed (%d) in stack.", kMaxTracksStack));
2824 return ntracks;
2825 }
2826 cseed += 6;
41702fec 2827 }
2828 }
2829 }
41702fec 2830
2831 return ntracks;
e4f2f73d 2832}
2833
2834//_____________________________________________________________________________
0906e73e 2835AliTRDtrackV1* AliTRDtrackerV1::MakeTrack(AliTRDseedV1 *seeds, Double_t *params)
e4f2f73d 2836{
afa21247 2837//
2838// Build a TRD track out of tracklet candidates
2839//
2840// Parameters :
2841// seeds : array of tracklets
2842// params : array of track parameters as they are estimated by stand alone tracker. 7 elements.
2843// [0] - radial position of the track at reference point
2844// [1] - y position of the fit at [0]
2845// [2] - z position of the fit at [0]
2846// [3] - snp of the first tracklet
2847// [4] - tgl of the first tracklet
2848// [5] - curvature of the Riemann fit - 1/pt
2849// [6] - sector rotation angle
2850//
2851// Output :
2852// The TRD track.
2853//
2854// Initialize the TRD track based on the parameters of the fit and a parametric covariance matrix
2855// (diagonal with constant variance terms TODO - correct parameterization)
2856//
2857// In case of HLT just register the tracklets in the tracker and return values of the Riemann fit. For the
2858// offline case perform a full Kalman filter on the already found tracklets (see AliTRDtrackerV1::FollowBackProlongation()
2859// for details). Do also MC label calculation and PID if propagation successfully.
41702fec 2860
afa21247 2861
41702fec 2862 Double_t alpha = AliTRDgeometry::GetAlpha();
2863 Double_t shift = AliTRDgeometry::GetAlpha()/2.0;
2864 Double_t c[15];
2865
afa21247 2866 c[ 0] = 0.2; // s^2_y
2867 c[ 1] = 0.0; c[ 2] = 2.0; // s^2_z
2868 c[ 3] = 0.0; c[ 4] = 0.0; c[ 5] = 0.02; // s^2_snp
2869 c[ 6] = 0.0; c[ 7] = 0.0; c[ 8] = 0.0; c[ 9] = 0.1; // s^2_tgl
2870 c[10] = 0.0; c[11] = 0.0; c[12] = 0.0; c[13] = 0.0; c[14] = params[5]*params[5]*0.01; // s^2_1/pt
41702fec 2871
d20df6fc 2872 AliTRDtrackV1 track(seeds, &params[1], c, params[0], params[6]*alpha+shift);
2873 track.PropagateTo(params[0]-5.0);
f29f13a6 2874 AliTRDseedV1 *ptrTracklet = 0x0;
9887cc9f 2875
2876 // skip Kalman filter for HLT
91834b8d 2877 if(fReconstructor->IsHLT()){
9887cc9f 2878 for (Int_t jLayer = 0; jLayer < AliTRDgeometry::kNlayer; jLayer++) {
2879 track.UnsetTracklet(jLayer);
2880 ptrTracklet = &seeds[jLayer];
2881 if(!ptrTracklet->IsOK()) continue;
6e39bde4 2882 if(TMath::Abs(ptrTracklet->GetYref(1) - ptrTracklet->GetYfit(1)) >= .2) continue; // check this condition with Marian
9887cc9f 2883 ptrTracklet = SetTracklet(ptrTracklet);
f29f13a6 2884 ptrTracklet->UseClusters();
91834b8d 2885 track.SetTracklet(ptrTracklet, fTracklets->GetEntriesFast()-1);
2886 }
d78d7df0 2887 AliTRDtrackV1 *ptrTrack = SetTrack(&track);
799e38d7 2888 ptrTrack->CookPID();
6e39bde4 2889 ptrTrack->SetReconstructor(fReconstructor);
d78d7df0 2890 return ptrTrack;
91834b8d 2891 }
393fda1c 2892
d20df6fc 2893 track.ResetCovariance(1);
e79f8eb0 2894 Int_t nc = TMath::Abs(FollowBackProlongation(track));
393fda1c 2895 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 5){
2896 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2897 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2898 Double_t p[5]; // Track Params for the Debug Stream
2899 track.GetExternalParameters(params[0], p);
29f95561 2900 TTreeSRedirector &cs = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
393fda1c 2901 cs << "MakeTrack"
2902 << "EventNumber=" << eventNumber
2903 << "CandidateNumber=" << candidateNumber
2904 << "nc=" << nc
2905 << "X=" << params[0]
2906 << "Y=" << p[0]
2907 << "Z=" << p[1]
2908 << "snp=" << p[2]
2909 << "tnd=" << p[3]
2910 << "crv=" << p[4]
2911 << "Yin=" << params[1]
2912 << "Zin=" << params[2]
2913 << "snpin=" << params[3]
2914 << "tndin=" << params[4]
2915 << "crvin=" << params[5]
2916 << "track.=" << &track
2917 << "\n";
2918 }
d20df6fc 2919 if (nc < 30) return 0x0;
2920
2921 AliTRDtrackV1 *ptrTrack = SetTrack(&track);
215f7116 2922 ptrTrack->SetReconstructor(fReconstructor);
48f8adf3 2923 ptrTrack->CookLabel(.9);
24253b0a 2924
d20df6fc 2925 // computes PID for track
2926 ptrTrack->CookPID();
2927 // update calibration references using this track
48f8adf3 2928 AliTRDCalibraFillHisto *calibra = AliTRDCalibraFillHisto::Instance();
2929 if (!calibra){
2930 AliInfo("Could not get Calibra instance\n");
2931 if(calibra->GetHisto2d()) calibra->UpdateHistogramsV1(ptrTrack);
2932 }
d20df6fc 2933 return ptrTrack;
e4f2f73d 2934}
2935
0906e73e 2936
e4f2f73d 2937//____________________________________________________________________
eb38ed55 2938Int_t AliTRDtrackerV1::ImproveSeedQuality(AliTRDtrackingChamber **stack, AliTRDseedV1 *cseed)
e4f2f73d 2939{
41702fec 2940 //
2941 // Sort tracklets according to "quality" and try to "improve" the first 4 worst
2942 //
2943 // Parameters :
2944 // layers : Array of propagation layers for a stack/supermodule
2945 // cseed : Array of 6 seeding tracklets which has to be improved
2946 //
f29f13a6 2947 // Output :
41702fec 2948 // cssed : Improved seeds
2949 //
2950 // Detailed description
2951 //
2952 // Iterative procedure in which new clusters are searched for each
2953 // tracklet seed such that the seed quality (see AliTRDseed::GetQuality())
2954 // can be maximized. If some optimization is found the old seeds are replaced.
2955 //
2956 // debug level: 7
2957 //
2958
2959 // make a local working copy
2960 AliTRDtrackingChamber *chamber = 0x0;
2961 AliTRDseedV1 bseed[6];
2962 Int_t nLayers = 0;
2963 for (Int_t jLayer = 0; jLayer < 6; jLayer++) bseed[jLayer] = cseed[jLayer];
2964
2965 Float_t lastquality = 10000.0;
2966 Float_t lastchi2 = 10000.0;
2967 Float_t chi2 = 1000.0;
2968
2969 for (Int_t iter = 0; iter < 4; iter++) {
2970 Float_t sumquality = 0.0;
2971 Float_t squality[6];
2972 Int_t sortindexes[6];
2973
2974 for (Int_t jLayer = 0; jLayer < 6; jLayer++) {
3a039a31 2975 squality[jLayer] = bseed[jLayer].IsOK() ? bseed[jLayer].GetQuality(kTRUE) : 1000.;
41702fec 2976 sumquality += squality[jLayer];
2977 }
2978 if ((sumquality >= lastquality) || (chi2 > lastchi2)) break;
2979
2980 nLayers = 0;
2981 lastquality = sumquality;
2982 lastchi2 = chi2;
2983 if (iter > 0) for (Int_t jLayer = 0; jLayer < 6; jLayer++) cseed[jLayer] = bseed[jLayer];
2984
2985 TMath::Sort(6, squality, sortindexes, kFALSE);
2986 for (Int_t jLayer = 5; jLayer > 1; jLayer--) {
2987 Int_t bLayer = sortindexes[jLayer];
2988 if(!(chamber = stack[bLayer])) continue;
f29f13a6 2989 bseed[bLayer].AttachClusters(chamber, kTRUE);
2990 bseed[bLayer].Fit(kTRUE);
41702fec 2991 if(bseed[bLayer].IsOK()) nLayers++;
2992 }
2993
2994 chi2 = FitTiltedRieman(bseed, kTRUE);
3a039a31 2995 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 7){
41702fec 2996 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2997 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2998 TLinearFitter *tiltedRieman = GetTiltedRiemanFitter();
29f95561 2999 TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
41702fec 3000 cstreamer << "ImproveSeedQuality"
3001 << "EventNumber=" << eventNumber
3002 << "CandidateNumber=" << candidateNumber
3003 << "Iteration=" << iter
3004 << "S0.=" << &bseed[0]
3005 << "S1.=" << &bseed[1]
3006 << "S2.=" << &bseed[2]
3007 << "S3.=" << &bseed[3]
3008 << "S4.=" << &bseed[4]
3009 << "S5.=" << &bseed[5]
3010 << "FitterT.=" << tiltedRieman
3011 << "\n";
3012 }
3013 } // Loop: iter
41702fec 3014 // we are sure that at least 2 tracklets are OK !
3015 return nLayers+2;
e4f2f73d 3016}
3017
eb38ed55 3018//_________________________________________________________________________
3019Double_t AliTRDtrackerV1::CalculateTrackLikelihood(AliTRDseedV1 *tracklets, Double_t *chi2){
41702fec 3020 //
3021 // Calculates the Track Likelihood value. This parameter serves as main quality criterion for
3022 // the track selection
3023 // The likelihood value containes:
3024 // - The chi2 values from the both fitters and the chi2 values in z-direction from a linear fit
3025 // - The Sum of the Parameter |slope_ref - slope_fit|/Sigma of the tracklets
3026 // For all Parameters an exponential dependency is used
3027 //
3028 // Parameters: - Array of tracklets (AliTRDseedV1) related to the track candidate
3029 // - Array of chi2 values:
3030 // * Non-Constrained Tilted Riemann fit
3031 // * Vertex-Constrained Tilted Riemann fit
3032 // * z-Direction from Linear fit
3033 // Output: - The calculated track likelihood
3034 //
3035 // debug level 2
3036 //
3037
f29f13a6 3038 Double_t chi2phi = 0, nLayers = 0;
41702fec 3039 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
3040 if(!tracklets[iLayer].IsOK()) continue;
f29f13a6 3041 chi2phi += tracklets[iLayer].GetChi2Phi();
41702fec 3042 nLayers++;
3043 }
f29f13a6 3044 chi2phi /= Float_t (nLayers - 2.0);
41702fec 3045
3046 Double_t likeChi2Z = TMath::Exp(-chi2[2] * 0.14); // Chi2Z
b72f4eaf 3047 Double_t likeChi2TC = (fReconstructor->HasVertexConstrained()) ?
d20df6fc 3048 TMath::Exp(-chi2[1] * 0.677) : 1; // Constrained Tilted Riemann
6e39bde4 3049 Double_t likeChi2TR = TMath::Exp(-chi2[0] * 0.0078); // Non-constrained Tilted Riemann
3050 Double_t likeChi2Phi= TMath::Exp(-chi2phi * 3.23);//3.23
f29f13a6 3051 Double_t trackLikelihood = likeChi2Z * likeChi2TR * likeChi2Phi;
41702fec 3052
3a039a31 3053 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){
41702fec 3054 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
3055 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
29f95561 3056 TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
41702fec 3057 cstreamer << "CalculateTrackLikelihood0"
3058 << "EventNumber=" << eventNumber
3059 << "CandidateNumber=" << candidateNumber
3060 << "LikeChi2Z=" << likeChi2Z
3061 << "LikeChi2TR=" << likeChi2TR
3062 << "LikeChi2TC=" << likeChi2TC
f29f13a6 3063 << "LikeChi2Phi=" << likeChi2Phi
41702fec 3064 << "TrackLikelihood=" << trackLikelihood
3065 << "\n";
3066 }
6e39bde4 3067
41702fec 3068 return trackLikelihood;
e4f2f73d 3069}
3070
3071//____________________________________________________________________
91834b8d 3072Double_t AliTRDtrackerV1::CookLikelihood(AliTRDseedV1 *cseed, Int_t planes[4])
e4f2f73d 3073{
41702fec 3074 //
3075 // Calculate the probability of this track candidate.
3076 //
3077 // Parameters :
3078 // cseeds : array of candidate tracklets
3079 // planes : array of seeding planes (see seeding configuration)
3080 // chi2 : chi2 values (on the Z and Y direction) from the rieman fit of the track.
3081 //
3082 // Output :
3083 // likelihood value
3084 //
3085 // Detailed description
3086 //
3087 // The track quality is estimated based on the following 4 criteria:
3088 // 1. precision of the rieman fit on the Y direction (likea)
3089 // 2. chi2 on the Y direction (likechi2y)
3090 // 3. chi2 on the Z direction (likechi2z)
3091 // 4. number of attached clusters compared to a reference value
3092 // (see AliTRDrecoParam::fkFindable) (likeN)
3093 //
3094 // The distributions for each type of probabilities are given below as of
3095 // (date). They have to be checked to assure consistency of estimation.
3096 //
3097
3098 // ratio of the total number of clusters/track which are expected to be found by the tracker.
91834b8d 3099 const AliTRDrecoParam *fRecoPars = fReconstructor->GetRecoParam();
41702fec 3100
91834b8d 3101 Double_t chi2y = GetChi2Y(&cseed[0]);
3102 Double_t chi2z = GetChi2Z(&cseed[0]);
3103
8ae98148 3104 Float_t nclusters = 0.;
41702fec 3105 Double_t sumda = 0.;
3106 for(UChar_t ilayer = 0; ilayer < 4; ilayer++){
3107 Int_t jlayer = planes[ilayer];
3108 nclusters += cseed[jlayer].GetN2();
e3cf3d02 3109 sumda += TMath::Abs(cseed[jlayer].GetYfit(1) - cseed[jlayer].GetYref(1));
41702fec 3110 }
8ae98148 3111 nclusters *= .25;
3112
5a2e200c 3113 Double_t likea = TMath::Exp(-sumda * fRecoPars->GetPhiSlope());
41702fec 3114 Double_t likechi2y = 0.0000000001;
5a2e200c 3115 if (fReconstructor->IsCosmic() || chi2y < fRecoPars->GetChi2YCut()) likechi2y += TMath::Exp(-TMath::Sqrt(chi2y) * fRecoPars->GetChi2YSlope());
3116 Double_t likechi2z = TMath::Exp(-chi2z * fRecoPars->GetChi2ZSlope());
8ae98148 3117 Double_t likeN = TMath::Exp(-(fRecoPars->GetNMeanClusters() - nclusters) / fRecoPars->GetNSigmaClusters());
41702fec 3118 Double_t like = likea * likechi2y * likechi2z * likeN;
3119
3a039a31 3120 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){
41702fec 3121 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
3122 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
91834b8d 3123 Int_t nTracklets = 0; Float_t mean_ncls = 0;
3124 for(Int_t iseed=0; iseed < kNPlanes; iseed++){
3125 if(!cseed[iseed].IsOK()) continue;
3126 nTracklets++;
3127 mean_ncls += cseed[iseed].GetN2();
3128 }
3129 if(nTracklets) mean_ncls /= nTracklets;
41702fec 3130 // The Debug Stream contains the seed
29f95561 3131 TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
41702fec 3132 cstreamer << "CookLikelihood"
3133 << "EventNumber=" << eventNumber
3134 << "CandidateNumber=" << candidateNumber
3135 << "tracklet0.=" << &cseed[0]
3136 << "tracklet1.=" << &cseed[1]
3137 << "tracklet2.=" << &cseed[2]
3138 << "tracklet3.=" << &cseed[3]
3139 << "tracklet4.=" << &cseed[4]
3140 << "tracklet5.=" << &cseed[5]
3141 << "sumda=" << sumda
91834b8d 3142 << "chi2y=" << chi2y
3143 << "chi2z=" << chi2z
41702fec 3144 << "likea=" << likea
3145 << "likechi2y=" << likechi2y
3146 << "likechi2z=" << likechi2z
3147 << "nclusters=" << nclusters
3148 << "likeN=" << likeN
3149 << "like=" << like
91834b8d 3150 << "meanncls=" << mean_ncls
41702fec 3151 << "\n";
3152 }
3153
3154 return like;
e4f2f73d 3155}
3156
e4f2f73d 3157//____________________________________________________________________
0906e73e 3158void AliTRDtrackerV1::GetSeedingConfig(Int_t iconfig, Int_t planes[4])
e4f2f73d 3159{
41702fec 3160 //
3161 // Map seeding configurations to detector planes.
3162 //
3163 // Parameters :
3164 // iconfig : configuration index
3165 // planes : member planes of this configuration. On input empty.
3166 //
3167 // Output :
3168 // planes : contains the planes which are defining the configuration
3169 //
3170 // Detailed description
3171 //
3172 // Here is the list of seeding planes configurations together with
3173 // their topological classification:
3174 //
3175 // 0 - 5432 TQ 0
3176 // 1 - 4321 TQ 0
3177 // 2 - 3210 TQ 0
3178 // 3 - 5321 TQ 1
3179 // 4 - 4210 TQ 1
3180 // 5 - 5431 TQ 1
3181 // 6 - 4320 TQ 1
3182 // 7 - 5430 TQ 2
3183 // 8 - 5210 TQ 2
3184 // 9 - 5421 TQ 3
3185 // 10 - 4310 TQ 3
3186 // 11 - 5410 TQ 4
3187 // 12 - 5420 TQ 5
3188 // 13 - 5320 TQ 5
3189 // 14 - 5310 TQ 5
3190 //
3191 // The topologic quality is modeled as follows:
3192 // 1. The general model is define by the equation:
3193 // p(conf) = exp(-conf/2)
3194 // 2. According to the topologic classification, configurations from the same
3195 // class are assigned the agerage value over the model values.
3196 // 3. Quality values are normalized.
3197 //
3198 // The topologic quality distribution as function of configuration is given below:
3199 //Begin_Html
3200 // <img src="gif/topologicQA.gif">
3201 //End_Html
3202 //
3203
3204 switch(iconfig){
3205 case 0: // 5432 TQ 0
3206 planes[0] = 2;
3207 planes[1] = 3;
3208 planes[2] = 4;
3209 planes[3] = 5;
3210 break;
3211 case 1: // 4321 TQ 0
3212 planes[0] = 1;
3213 planes[1] = 2;
3214 planes[2] = 3;
3215 planes[3] = 4;
3216 break;
3217 case 2: // 3210 TQ 0
3218 planes[0] = 0;
3219 planes[1] = 1;
3220 planes[2] = 2;
3221 planes[3] = 3;
3222 break;
3223 case 3: // 5321 TQ 1
3224 planes[0] = 1;
3225 planes[1] = 2;
3226 planes[2] = 3;
3227 planes[3] = 5;
3228 break;
3229 case 4: // 4210 TQ 1
3230 planes[0] = 0;
3231 planes[1] = 1;
3232 planes[2] = 2;
3233 planes[3] = 4;
3234 break;
3235 case 5: // 5431 TQ 1
3236 planes[0] = 1;
3237 planes[1] = 3;
3238 planes[2] = 4;
3239 planes[3] = 5;
3240 break;
3241 case 6: // 4320 TQ 1
3242 planes[0] = 0;
3243 planes[1] = 2;
3244 planes[2] = 3;
3245 planes[3] = 4;
3246 break;
3247 case 7: // 5430 TQ 2
3248 planes[0] = 0;
3249 planes[1] = 3;
3250 planes[2] = 4;
3251 planes[3] = 5;
3252 break;
3253 case 8: // 5210 TQ 2
3254 planes[0] = 0;
3255 planes[1] = 1;
3256 planes[2] = 2;
3257 planes[3] = 5;
3258 break;
3259 case 9: // 5421 TQ 3
3260 planes[0] = 1;
3261 planes[1] = 2;
3262 planes[2] = 4;
3263 planes[3] = 5;
3264 break;
3265 case 10: // 4310 TQ 3
3266 planes[0] = 0;
3267 planes[1] = 1;
3268 planes[2] = 3;
3269 planes[3] = 4;
3270 break;
3271 case 11: // 5410 TQ 4
3272 planes[0] = 0;
3273 planes[1] = 1;
3274 planes[2] = 4;
3275 planes[3] = 5;
3276 break;
3277 case 12: // 5420 TQ 5
3278 planes[0] = 0;
3279 planes[1] = 2;
3280 planes[2] = 4;
3281 planes[3] = 5;
3282 break;
3283 case 13: // 5320 TQ 5
3284 planes[0] = 0;
3285 planes[1] = 2;
3286 planes[2] = 3;
3287 planes[3] = 5;
3288 break;
3289 case 14: // 5310 TQ 5
3290 planes[0] = 0;
3291 planes[1] = 1;
3292 planes[2] = 3;
3293 planes[3] = 5;
3294 break;
3295 }
e4f2f73d 3296}
3297
3298//____________________________________________________________________
0906e73e 3299void AliTRDtrackerV1::GetExtrapolationConfig(Int_t iconfig, Int_t planes[2])
e4f2f73d 3300{
41702fec 3301 //
3302 // Returns the extrapolation planes for a seeding configuration.
3303 //
3304 // Parameters :
3305 // iconfig : configuration index
3306 // planes : planes which are not in this configuration. On input empty.
3307 //
3308 // Output :
3309 // planes : contains the planes which are not in the configuration
3310 //
3311 // Detailed description
3312 //
3313
3314 switch(iconfig){
3315 case 0: // 5432 TQ 0