Drift velocity calibration - update
[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
e4f2f73d 28#include <TBranch.h>
bb56afff 29#include <TDirectory.h>
e4f2f73d 30#include <TLinearFitter.h>
e4f2f73d 31#include <TTree.h>
32#include <TClonesArray.h>
e4f2f73d 33#include <TTreeStream.h>
eb2b4f91 34#include <TGeoMatrix.h>
35#include <TGeoManager.h>
e4f2f73d 36
37#include "AliLog.h"
fac58f00 38#include "AliMathBase.h"
e4f2f73d 39#include "AliESDEvent.h"
bb56afff 40#include "AliGeomManager.h"
e4f2f73d 41#include "AliRieman.h"
42#include "AliTrackPointArray.h"
43
e4f2f73d 44#include "AliTRDgeometry.h"
45#include "AliTRDpadPlane.h"
e4f2f73d 46#include "AliTRDcalibDB.h"
e4f2f73d 47#include "AliTRDReconstructor.h"
48#include "AliTRDCalibraFillHisto.h"
e4f2f73d 49#include "AliTRDrecoParam.h"
bb56afff 50
51#include "AliTRDcluster.h"
e4f2f73d 52#include "AliTRDseedV1.h"
0906e73e 53#include "AliTRDtrackV1.h"
bb56afff 54#include "AliTRDtrackerV1.h"
55#include "AliTRDtrackerDebug.h"
56#include "AliTRDtrackingChamber.h"
57#include "AliTRDchamberTimeBin.h"
58
e4f2f73d 59ClassImp(AliTRDtrackerV1)
eb38ed55 60
eb38ed55 61const Float_t AliTRDtrackerV1::fgkMinClustersInTrack = 0.5; //
62const Float_t AliTRDtrackerV1::fgkLabelFraction = 0.8; //
63const Double_t AliTRDtrackerV1::fgkMaxChi2 = 12.0; //
64const Double_t AliTRDtrackerV1::fgkMaxSnp = 0.95; // Maximum local sine of the azimuthal angle
65const Double_t AliTRDtrackerV1::fgkMaxStep = 2.0; // Maximal step size in propagation
d76231c8 66Double_t AliTRDtrackerV1::fgTopologicQA[kNConfigs] = {
6e39bde4 67 0.5112, 0.5112, 0.5112, 0.0786, 0.0786,
41702fec 68 0.0786, 0.0786, 0.0579, 0.0579, 0.0474,
69 0.0474, 0.0408, 0.0335, 0.0335, 0.0335
e165b64b 70};
71const Double_t AliTRDtrackerV1::fgkX0[kNPlanes] = {
72 300.2, 312.8, 325.4, 338.0, 350.6, 363.2};
2985ffcb 73Int_t AliTRDtrackerV1::fgNTimeBins = 0;
4d6aee34 74AliRieman* AliTRDtrackerV1::fgRieman = NULL;
75TLinearFitter* AliTRDtrackerV1::fgTiltedRieman = NULL;
76TLinearFitter* AliTRDtrackerV1::fgTiltedRiemanConstrained = NULL;
e4f2f73d 77
78//____________________________________________________________________
3a039a31 79AliTRDtrackerV1::AliTRDtrackerV1(AliTRDReconstructor *rec)
41702fec 80 :AliTracker()
4d6aee34 81 ,fkReconstructor(NULL)
82 ,fGeom(NULL)
83 ,fClusters(NULL)
84 ,fTracklets(NULL)
85 ,fTracks(NULL)
41702fec 86 ,fSieveSeeding(0)
e4f2f73d 87{
41702fec 88 //
89 // Default constructor.
90 //
eb2b4f91 91
92 SetReconstructor(rec); // initialize reconstructor
93
94 // initialize geometry
95 if(!AliGeomManager::GetGeometry()){
96 AliFatal("Could not get geometry.");
97 }
98 fGeom = new AliTRDgeometry();
99 fGeom->CreateClusterMatrixArray();
4d6aee34 100 TGeoHMatrix *matrix = NULL;
eb2b4f91 101 Double_t loc[] = {0., 0., 0.};
102 Double_t glb[] = {0., 0., 0.};
103 for(Int_t ily=kNPlanes; ily--;){
e165b64b 104 Int_t ism = 0;
105 while(!(matrix = fGeom->GetClusterMatrix(AliTRDgeometry::GetDetector(ily, 2, ism)))) ism++;
106 if(!matrix){
107 AliError(Form("Could not get transformation matrix for layer %d. Use default.", ily));
108 fR[ily] = fgkX0[ily];
eb2b4f91 109 continue;
110 }
111 matrix->LocalToMaster(loc, glb);
112 fR[ily] = glb[0]+ AliTRDgeometry::AnodePos()-.5*AliTRDgeometry::AmThick() - AliTRDgeometry::DrThick();
113 }
114
115 // initialize calibration values
4d6aee34 116 AliTRDcalibDB *trd = NULL;
a7ac01d2 117 if (!(trd = AliTRDcalibDB::Instance())) {
eb2b4f91 118 AliFatal("Could not get calibration.");
41702fec 119 }
a7ac01d2 120 if(!fgNTimeBins) fgNTimeBins = trd->GetNumberOfTimeBins();
41702fec 121
eb2b4f91 122 // initialize cluster containers
053767a4 123 for (Int_t isector = 0; isector < AliTRDgeometry::kNsector; isector++) new(&fTrSec[isector]) AliTRDtrackingSector(fGeom, isector);
3a039a31 124
eb2b4f91 125 // initialize arrays
126 memset(fTrackQuality, 0, kMaxTracksStack*sizeof(Double_t));
127 memset(fSeedLayer, 0, kMaxTracksStack*sizeof(Int_t));
128 memset(fSeedTB, 0, kNSeedPlanes*sizeof(AliTRDchamberTimeBin*));
eb38ed55 129}
130
e4f2f73d 131//____________________________________________________________________
132AliTRDtrackerV1::~AliTRDtrackerV1()
133{
41702fec 134 //
135 // Destructor
136 //
137
4d6aee34 138 if(fgRieman) delete fgRieman; fgRieman = NULL;
139 if(fgTiltedRieman) delete fgTiltedRieman; fgTiltedRieman = NULL;
140 if(fgTiltedRiemanConstrained) delete fgTiltedRiemanConstrained; fgTiltedRiemanConstrained = NULL;
d611c74f 141 for(Int_t isl =0; isl<kNSeedPlanes; isl++) if(fSeedTB[isl]) delete fSeedTB[isl];
41702fec 142 if(fTracks) {fTracks->Delete(); delete fTracks;}
143 if(fTracklets) {fTracklets->Delete(); delete fTracklets;}
48f8adf3 144 if(fClusters) {
145 fClusters->Delete(); delete fClusters;
146 }
41702fec 147 if(fGeom) delete fGeom;
e4f2f73d 148}
149
150//____________________________________________________________________
151Int_t AliTRDtrackerV1::Clusters2Tracks(AliESDEvent *esd)
152{
41702fec 153 //
154 // Steering stand alone tracking for full TRD detector
155 //
156 // Parameters :
157 // esd : The ESD event. On output it contains
158 // the ESD tracks found in TRD.
159 //
160 // Output :
161 // Number of tracks found in the TRD detector.
162 //
163 // Detailed description
164 // 1. Launch individual SM trackers.
165 // See AliTRDtrackerV1::Clusters2TracksSM() for details.
166 //
167
4d6aee34 168 if(!fkReconstructor->GetRecoParam() ){
3a039a31 169 AliError("Reconstruction configuration not initialized. Call first AliTRDReconstructor::SetRecoParam().");
41702fec 170 return 0;
171 }
172
173 //AliInfo("Start Track Finder ...");
174 Int_t ntracks = 0;
053767a4 175 for(int ism=0; ism<AliTRDgeometry::kNsector; ism++){
41702fec 176 // for(int ism=1; ism<2; ism++){
177 //AliInfo(Form("Processing supermodule %i ...", ism));
178 ntracks += Clusters2TracksSM(ism, esd);
179 }
180 AliInfo(Form("Number of found tracks : %d", ntracks));
181 return ntracks;
e4f2f73d 182}
183
0906e73e 184
185//_____________________________________________________________________________
eb38ed55 186Bool_t AliTRDtrackerV1::GetTrackPoint(Int_t index, AliTrackPoint &p) const
0906e73e 187{
41702fec 188 //AliInfo(Form("Asking for tracklet %d", index));
189
84eab75a 190 // reset position of the point before using it
191 p.SetXYZ(0., 0., 0.);
2f7514a6 192 AliTRDseedV1 *tracklet = GetTracklet(index);
193 if (!tracklet) return kFALSE;
84eab75a 194
41702fec 195 // get detector for this tracklet
e165b64b 196 Int_t det = tracklet->GetDetector();
197 Int_t sec = fGeom->GetSector(det);
198 Double_t alpha = (sec+.5)*AliTRDgeometry::GetAlpha(),
199 sinA = TMath::Sin(alpha),
200 cosA = TMath::Cos(alpha);
41702fec 201 Double_t local[3];
e165b64b 202 local[0] = tracklet->GetX();
203 local[1] = tracklet->GetY();
204 local[2] = tracklet->GetZ();
41702fec 205 Double_t global[3];
e165b64b 206 fGeom->RotateBack(det, local, global);
207
208 Double_t cov2D[3]; Float_t cov[6];
209 tracklet->GetCovAt(local[0], cov2D);
210 cov[0] = cov2D[0]*sinA*sinA;
211 cov[1] =-cov2D[0]*sinA*cosA;
212 cov[2] =-cov2D[1]*sinA;
213 cov[3] = cov2D[0]*cosA*cosA;
214 cov[4] = cov2D[1]*cosA;
215 cov[5] = cov2D[2];
216 // store the global position of the tracklet and its covariance matrix in the track point
217 p.SetXYZ(global[0],global[1],global[2], cov);
41702fec 218
219 // setting volume id
e165b64b 220 AliGeomManager::ELayerID iLayer = AliGeomManager::ELayerID(AliGeomManager::kTRD1+fGeom->GetLayer(det));
221 Int_t modId = fGeom->GetSector(det) * AliTRDgeometry::kNstack + fGeom->GetStack(det);
41702fec 222 UShort_t volid = AliGeomManager::LayerToVolUID(iLayer, modId);
223 p.SetVolumeID(volid);
224
225 return kTRUE;
0906e73e 226}
227
eb38ed55 228//____________________________________________________________________
229TLinearFitter* AliTRDtrackerV1::GetTiltedRiemanFitter()
230{
41702fec 231 if(!fgTiltedRieman) fgTiltedRieman = new TLinearFitter(4, "hyp4");
232 return fgTiltedRieman;
eb38ed55 233}
0906e73e 234
eb38ed55 235//____________________________________________________________________
236TLinearFitter* AliTRDtrackerV1::GetTiltedRiemanFitterConstraint()
237{
41702fec 238 if(!fgTiltedRiemanConstrained) fgTiltedRiemanConstrained = new TLinearFitter(2, "hyp2");
239 return fgTiltedRiemanConstrained;
eb38ed55 240}
41702fec 241
eb38ed55 242//____________________________________________________________________
243AliRieman* AliTRDtrackerV1::GetRiemanFitter()
244{
fac58f00 245 if(!fgRieman) fgRieman = new AliRieman(AliTRDseedV1::kNtb * AliTRDgeometry::kNlayer);
41702fec 246 return fgRieman;
eb38ed55 247}
41702fec 248
0906e73e 249//_____________________________________________________________________________
250Int_t AliTRDtrackerV1::PropagateBack(AliESDEvent *event)
251{
2a3191bb 252// Propagation of ESD tracks from TPC to TOF detectors and building of the TRD track. For building
253// a TRD track an ESD track is used as seed. The informations obtained on the TRD track (measured points,
254// covariance, PID, etc.) are than used to update the corresponding ESD track.
255// Each track seed is first propagated to the geometrical limit of the TRD detector.
256// Its prolongation is searched in the TRD and if corresponding clusters are found tracklets are
257// constructed out of them (see AliTRDseedV1::AttachClusters()) and the track is updated.
258// Otherwise the ESD track is left unchanged.
259//
260// The following steps are performed:
261// 1. Selection of tracks based on the variance in the y-z plane.
262// 2. Propagation to the geometrical limit of the TRD volume. If track propagation fails the AliESDtrack::kTRDStop is set.
263// 3. Prolongation inside the fiducial volume (see AliTRDtrackerV1::FollowBackProlongation()) and marking
264// the following status bits:
265// - AliESDtrack::kTRDin - if the tracks enters the TRD fiducial volume
266// - AliESDtrack::kTRDStop - if the tracks fails propagation
267// - AliESDtrack::kTRDbackup - if the tracks fulfills chi2 conditions and qualify for refitting
268// 4. Writting to friends, PID, MC label, quality etc. Setting status bit AliESDtrack::kTRDout.
269// 5. Propagation to TOF. If track propagation fails the AliESDtrack::kTRDStop is set.
270//
271
272 AliTRDCalibraFillHisto *calibra = AliTRDCalibraFillHisto::Instance(); // Calibration monitor
41702fec 273 if (!calibra) AliInfo("Could not get Calibra instance\n");
274
eb2b4f91 275 // Define scalers
276 Int_t nFound = 0, // number of tracks found
277 nSeeds = 0, // total number of ESD seeds
278 nTRDseeds= 0, // number of seeds in the TRD acceptance
279 nTPCseeds= 0; // number of TPC seeds
41702fec 280 Float_t foundMin = 20.0;
281
4d6aee34 282 Float_t *quality = NULL;
283 Int_t *index = NULL;
eb2b4f91 284 nSeeds = event->GetNumberOfTracks();
285 // Sort tracks according to quality
286 // (covariance in the yz plane)
287 if(nSeeds){
288 quality = new Float_t[nSeeds];
289 index = new Int_t[nSeeds];
290 for (Int_t iSeed = nSeeds; iSeed--;) {
d611c74f 291 AliESDtrack *seed = event->GetTrack(iSeed);
292 Double_t covariance[15];
293 seed->GetExternalCovariance(covariance);
294 quality[iSeed] = covariance[0] + covariance[2];
295 }
eb2b4f91 296 TMath::Sort(nSeeds, quality, index,kFALSE);
41702fec 297 }
41702fec 298
eb2b4f91 299 // Propagate all seeds
41702fec 300 Int_t expectedClr;
301 AliTRDtrackV1 track;
eb2b4f91 302 for (Int_t iSeed = 0; iSeed < nSeeds; iSeed++) {
41702fec 303
304 // Get the seeds in sorted sequence
305 AliESDtrack *seed = event->GetTrack(index[iSeed]);
eb2b4f91 306 Float_t p4 = seed->GetC(seed->GetBz());
41702fec 307
308 // Check the seed status
309 ULong_t status = seed->GetStatus();
310 if ((status & AliESDtrack::kTPCout) == 0) continue;
311 if ((status & AliESDtrack::kTRDout) != 0) continue;
eb2b4f91 312
313 // Propagate to the entrance in the TRD mother volume
41702fec 314 new(&track) AliTRDtrackV1(*seed);
eb2b4f91 315 if(AliTRDgeometry::GetXtrdBeg() > (fgkMaxStep + track.GetX()) && !PropagateToX(track, AliTRDgeometry::GetXtrdBeg(), fgkMaxStep)){
316 seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
317 continue;
318 }
319 if(!AdjustSector(&track)){
320 seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
321 continue;
322 }
323 if(TMath::Abs(track.GetSnp()) > fgkMaxSnp) {
324 seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
325 continue;
326 }
327
328 nTPCseeds++;
e4d4864b 329
eb2b4f91 330 // store track status at TRD entrance
76b60503 331 seed->UpdateTrackParams(&track, AliESDtrack::kTRDbackup);
ae3fbe1f 332
eb2b4f91 333 // prepare track and do propagation in the TRD
4d6aee34 334 track.SetReconstructor(fkReconstructor);
eb2b4f91 335 track.SetKink(Bool_t(seed->GetKinkIndex(0)));
336 expectedClr = FollowBackProlongation(track);
337 // check if track entered the TRD fiducial volume
338 if(track.GetTrackLow()){
339 seed->UpdateTrackParams(&track, AliESDtrack::kTRDin);
340 nTRDseeds++;
341 }
342 // check if track was stopped in the TRD
343 if (expectedClr<0){
344 seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
345 continue;
346 }
ae3fbe1f 347
348 if(expectedClr){
eb2b4f91 349 nFound++;
41702fec 350 // computes PID for track
351 track.CookPID();
352 // update calibration references using this track
353 if(calibra->GetHisto2d()) calibra->UpdateHistogramsV1(&track);
354 // save calibration object
a2fbb6ec 355 if (fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) > 0){
224f357f 356 AliTRDtrackV1 *calibTrack = new AliTRDtrackV1(track);
357 calibTrack->SetOwner();
358 seed->AddCalibObject(calibTrack);
359 }
360 //update ESD track
41702fec 361 if ((track.GetNumberOfClusters() > 15) && (track.GetNumberOfClusters() > 0.5*expectedClr)) {
2389e96f 362 seed->UpdateTrackParams(&track, AliESDtrack::kTRDout);
41702fec 363 track.UpdateESDtrack(seed);
41702fec 364 }
365 }
366
27fbeba8 367 if ((TMath::Abs(track.GetC(track.GetBz()) - p4) / TMath::Abs(p4) < 0.2) ||(track.Pt() > 0.8)) {
e3cf3d02 368
41702fec 369 // Make backup for back propagation
41702fec 370 Int_t foundClr = track.GetNumberOfClusters();
371 if (foundClr >= foundMin) {
41702fec 372 track.CookLabel(1. - fgkLabelFraction);
f29f13a6 373 //if(track.GetBackupTrack()) UseClusters(track.GetBackupTrack());
41702fec 374
375 // Sign only gold tracks
376 if (track.GetChi2() / track.GetNumberOfClusters() < 4) {
f29f13a6 377 //if ((seed->GetKinkIndex(0) == 0) && (track.Pt() < 1.5)) UseClusters(&track);
41702fec 378 }
379 Bool_t isGold = kFALSE;
380
381 // Full gold track
382 if (track.GetChi2() / track.GetNumberOfClusters() < 5) {
383 if (track.GetBackupTrack()) seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup);
384
385 isGold = kTRUE;
386 }
387
388 // Almost gold track
389 if ((!isGold) && (track.GetNCross() == 0) && (track.GetChi2() / track.GetNumberOfClusters() < 7)) {
390 //seed->UpdateTrackParams(track, AliESDtrack::kTRDbackup);
391 if (track.GetBackupTrack()) seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup);
392
393 isGold = kTRUE;
394 }
395
396 if ((!isGold) && (track.GetBackupTrack())) {
397 if ((track.GetBackupTrack()->GetNumberOfClusters() > foundMin) && ((track.GetBackupTrack()->GetChi2()/(track.GetBackupTrack()->GetNumberOfClusters()+1)) < 7)) {
398 seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup);
399 isGold = kTRUE;
400 }
401 }
41702fec 402 }
403 }
404
eb2b4f91 405 // Propagation to the TOF
406 if(!(seed->GetStatus()&AliESDtrack::kTRDStop)) {
407 Int_t sm = track.GetSector();
408 // default value in case we have problems with the geometry.
409 Double_t xtof = 371.;
410 //Calculate radial position of the beginning of the TOF
411 //mother volume. In order to avoid mixing of the TRD
412 //and TOF modules some hard values are needed. This are:
413 //1. The path to the TOF module.
414 //2. The width of the TOF (29.05 cm)
415 //(with the help of Annalisa de Caro Mar-17-2009)
416 if(gGeoManager){
417 gGeoManager->cd(Form("/ALIC_1/B077_1/BSEGMO%d_1/BTOF%d_1", sm, sm));
4d6aee34 418 TGeoHMatrix *m = NULL;
eb2b4f91 419 Double_t loc[]={0., 0., -.5*29.05}, glob[3];
420
421 if((m=gGeoManager->GetCurrentMatrix())){
422 m->LocalToMaster(loc, glob);
423 xtof = TMath::Sqrt(glob[0]*glob[0]+glob[1]*glob[1]);
424 }
41702fec 425 }
672b48bd 426 if(xtof > (fgkMaxStep + track.GetX()) && !PropagateToX(track, xtof, fgkMaxStep)){
427 seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
428 continue;
429 }
430 if(!AdjustSector(&track)){
431 seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
432 continue;
433 }
434 if(TMath::Abs(track.GetSnp()) > fgkMaxSnp){
435 seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
436 continue;
437 }
eb2b4f91 438 seed->UpdateTrackParams(&track, AliESDtrack::kTRDout);
439 // TODO obsolete - delete
440 seed->SetTRDQuality(track.StatusForTOF());
41702fec 441 }
41702fec 442 seed->SetTRDBudget(track.GetBudget(0));
443 }
d611c74f 444 if(index) delete [] index;
445 if(quality) delete [] quality;
41702fec 446
d4cf71ca 447 AliInfo(Form("Number of seeds: TPCout[%d] TRDin[%d]", nTPCseeds, nTRDseeds));
448 AliInfo(Form("Number of tracks: TRDout[%d]", nFound));
449
d611c74f 450 // run stand alone tracking
4d6aee34 451 if (fkReconstructor->IsSeeding()) Clusters2Tracks(event);
41702fec 452
453 return 0;
0906e73e 454}
455
456
457//____________________________________________________________________
458Int_t AliTRDtrackerV1::RefitInward(AliESDEvent *event)
459{
41702fec 460 //
461 // Refits tracks within the TRD. The ESD event is expected to contain seeds
462 // at the outer part of the TRD.
463 // The tracks are propagated to the innermost time bin
464 // of the TRD and the ESD event is updated
465 // Origin: Thomas KUHR (Thomas.Kuhr@cern.ch)
466 //
467
468 Int_t nseed = 0; // contor for loaded seeds
469 Int_t found = 0; // contor for updated TRD tracks
470
471
472 AliTRDtrackV1 track;
473 for (Int_t itrack = 0; itrack < event->GetNumberOfTracks(); itrack++) {
474 AliESDtrack *seed = event->GetTrack(itrack);
475 new(&track) AliTRDtrackV1(*seed);
476
477 if (track.GetX() < 270.0) {
478 seed->UpdateTrackParams(&track, AliESDtrack::kTRDbackup);
479 continue;
480 }
481
e3cf3d02 482 // reject tracks which failed propagation in the TRD or
483 // are produced by the TRD stand alone tracker
41702fec 484 ULong_t status = seed->GetStatus();
e3cf3d02 485 if(!(status & AliESDtrack::kTRDout)) continue;
486 if(!(status & AliESDtrack::kTRDin)) continue;
41702fec 487 nseed++;
488
489 track.ResetCovariance(50.0);
490
491 // do the propagation and processing
492 Bool_t kUPDATE = kFALSE;
493 Double_t xTPC = 250.0;
494 if(FollowProlongation(track)){
495 // Prolongate to TPC
496 if (PropagateToX(track, xTPC, fgkMaxStep)) { // -with update
e3cf3d02 497 seed->UpdateTrackParams(&track, AliESDtrack::kTRDrefit);
498 found++;
499 kUPDATE = kTRUE;
500 }
501
502 // Update the friend track
a2fbb6ec 503 if (fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) > 0){
4d6aee34 504 TObject *o = NULL; Int_t ic = 0;
505 AliTRDtrackV1 *calibTrack = NULL;
e3cf3d02 506 while((o = seed->GetCalibObject(ic++))){
507 if(!(calibTrack = dynamic_cast<AliTRDtrackV1*>(o))) continue;
508 calibTrack->SetTrackHigh(track.GetTrackHigh());
509 }
41702fec 510 }
e3cf3d02 511 }
41702fec 512
513 // Prolongate to TPC without update
514 if(!kUPDATE) {
515 AliTRDtrackV1 tt(*seed);
e3cf3d02 516 if (PropagateToX(tt, xTPC, fgkMaxStep)) seed->UpdateTrackParams(&tt, AliESDtrack::kTRDbackup);
41702fec 517 }
518 }
519 AliInfo(Form("Number of loaded seeds: %d",nseed));
520 AliInfo(Form("Number of found tracks from loaded seeds: %d",found));
521
522 return 0;
0906e73e 523}
524
0906e73e 525//____________________________________________________________________
526Int_t AliTRDtrackerV1::FollowProlongation(AliTRDtrackV1 &t)
527{
41702fec 528 // Extrapolates the TRD track in the TPC direction.
529 //
530 // Parameters
531 // t : the TRD track which has to be extrapolated
532 //
533 // Output
534 // number of clusters attached to the track
535 //
536 // Detailed description
537 //
538 // Starting from current radial position of track <t> this function
539 // extrapolates the track through the 6 TRD layers. The following steps
540 // are being performed for each plane:
541 // 1. prepare track:
542 // a. get plane limits in the local x direction
543 // b. check crossing sectors
544 // c. check track inclination
545 // 2. search tracklet in the tracker list (see GetTracklet() for details)
546 // 3. evaluate material budget using the geo manager
547 // 4. propagate and update track using the tracklet information.
548 //
549 // Debug level 2
550 //
551
e3cf3d02 552 Bool_t kStoreIn = kTRUE;
41702fec 553 Int_t nClustersExpected = 0;
e3cf3d02 554 for (Int_t iplane = kNPlanes; iplane--;) {
41702fec 555 Int_t index = 0;
556 AliTRDseedV1 *tracklet = GetTracklet(&t, iplane, index);
557 if(!tracklet) continue;
558 if(!tracklet->IsOK()) AliWarning("tracklet not OK");
559
e3cf3d02 560 Double_t x = tracklet->GetX();//GetX0();
41702fec 561 // reject tracklets which are not considered for inward refit
562 if(x > t.GetX()+fgkMaxStep) continue;
563
564 // append tracklet to track
565 t.SetTracklet(tracklet, index);
566
567 if (x < (t.GetX()-fgkMaxStep) && !PropagateToX(t, x+fgkMaxStep, fgkMaxStep)) break;
568 if (!AdjustSector(&t)) break;
569
570 // Start global position
571 Double_t xyz0[3];
572 t.GetXYZ(xyz0);
573
574 // End global position
575 Double_t alpha = t.GetAlpha(), y, z;
576 if (!t.GetProlongation(x,y,z)) break;
577 Double_t xyz1[3];
578 xyz1[0] = x * TMath::Cos(alpha) - y * TMath::Sin(alpha);
579 xyz1[1] = x * TMath::Sin(alpha) + y * TMath::Cos(alpha);
580 xyz1[2] = z;
581
51a23065 582 Double_t length = TMath::Sqrt(
583 (xyz0[0]-xyz1[0])*(xyz0[0]-xyz1[0]) +
584 (xyz0[1]-xyz1[1])*(xyz0[1]-xyz1[1]) +
585 (xyz0[2]-xyz1[2])*(xyz0[2]-xyz1[2])
586 );
587 if(length>0.){
588 // Get material budget
589 Double_t param[7];
590 if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param)<=0.) break;
591 Double_t xrho= param[0]*param[4];
592 Double_t xx0 = param[1]; // Get mean propagation parameters
593
594 // Propagate and update
595 t.PropagateTo(x, xx0, xrho);
596 if (!AdjustSector(&t)) break;
597 }
e3cf3d02 598 if(kStoreIn){
599 t.SetTrackHigh();
600 kStoreIn = kFALSE;
601 }
602
b72f4eaf 603 Double_t cov[3]; tracklet->GetCovAt(x, cov);
604 Double_t p[2] = { tracklet->GetY(), tracklet->GetZ()};
605 Double_t chi2 = ((AliExternalTrackParam)t).GetPredictedChi2(p, cov);
606 if (chi2 < 1e+10 && t.Update(p, cov, chi2)){
41702fec 607 nClustersExpected += tracklet->GetN();
608 }
609 }
610
a2fbb6ec 611 if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) > 1){
41702fec 612 Int_t index;
51a23065 613 for(int iplane=0; iplane<AliTRDgeometry::kNlayer; iplane++){
41702fec 614 AliTRDseedV1 *tracklet = GetTracklet(&t, iplane, index);
615 if(!tracklet) continue;
616 t.SetTracklet(tracklet, index);
617 }
618
a2fbb6ec 619 if(fkReconstructor->IsDebugStreaming()){
620 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
621 TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
622 AliTRDtrackV1 track(t);
623 track.SetOwner();
624 cstreamer << "FollowProlongation"
625 << "EventNumber=" << eventNumber
626 << "ncl=" << nClustersExpected
627 << "track.=" << &track
628 << "\n";
629 }
41702fec 630 }
41702fec 631 return nClustersExpected;
0906e73e 632
633}
634
635//_____________________________________________________________________________
636Int_t AliTRDtrackerV1::FollowBackProlongation(AliTRDtrackV1 &t)
637{
afa21247 638// Extrapolates/Build the TRD track in the TOF direction.
639//
640// Parameters
641// t : the TRD track which has to be extrapolated
642//
643// Output
644// number of clusters attached to the track
645//
646// Starting from current radial position of track <t> this function
647// extrapolates the track through the 6 TRD layers. The following steps
648// are being performed for each plane:
649// 1. Propagate track to the entrance of the next chamber:
650// - get chamber limits in the radial direction
651// - check crossing sectors
652// - check track inclination
653// - check track prolongation against boundary conditions (see exclusion boundaries on AliTRDgeometry::IsOnBoundary())
654// 2. Build tracklet (see AliTRDseed::AttachClusters() for details) for this layer if needed. If only
655// Kalman filter is needed and tracklets are already linked to the track this step is skipped.
656// 3. Fit tracklet using the information from the Kalman filter.
657// 4. Propagate and update track at reference radial position of the tracklet.
658// 5. Register tracklet with the tracker and track; update pulls monitoring.
659//
660// Observation
2a3191bb 661// 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:
662// - AliTRDtrackV1::kProlongation : track prolongation failed
663// - AliTRDtrackV1::kPropagation : track prolongation failed
664// - AliTRDtrackV1::kAdjustSector : failed during sector crossing
665// - AliTRDtrackV1::kSnp : too large bending
666// - AliTRDtrackV1::kTrackletInit : fail to initialize tracklet
667// - AliTRDtrackV1::kUpdate : fail to attach clusters or fit the tracklet
668// - AliTRDtrackV1::kUnknown : anything which is not covered before
afa21247 669// 2. By default the status of the track before first TRD update is saved.
670//
671// Debug level 2
672//
673// Author
674// Alexandru Bercuci <A.Bercuci@gsi.de>
675//
41702fec 676
eb2b4f91 677 Int_t n = 0;
678 Double_t driftLength = .5*AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick();
4d6aee34 679 AliTRDtrackingChamber *chamber = NULL;
41702fec 680
4d6aee34 681 AliTRDseedV1 tracklet, *ptrTracklet = NULL;
181d2c97 682 // in case of stand alone tracking we store all the pointers to the tracklets in a temporary array
683 AliTRDseedV1 *tracklets[kNPlanes];
684 memset(tracklets, 0, sizeof(AliTRDseedV1 *) * kNPlanes);
685 for(Int_t ip = 0; ip < kNPlanes; ip++){
686 tracklets[ip] = t.GetTracklet(ip);
687 t.UnsetTracklet(ip);
688 }
81a6494d 689 Bool_t kStoreIn = kTRUE, kPropagateIn = kTRUE;
e3cf3d02 690
053767a4 691 // Loop through the TRD layers
4d6aee34 692 TGeoHMatrix *matrix = NULL;
eb2b4f91 693 Double_t x, y, z;
694 for (Int_t ily=0, sm=-1, stk=-1, det=-1; ily < AliTRDgeometry::kNlayer; ily++) {
695 // rough estimate of the entry point
696 if (!t.GetProlongation(fR[ily], y, z)){
697 n=-1;
698 t.SetStatus(AliTRDtrackV1::kProlongation);
699 break;
700 }
41702fec 701
eb2b4f91 702 // find sector / stack / detector
703 sm = t.GetSector();
704 // TODO cross check with y value !
705 stk = fGeom->GetStack(z, ily);
706 det = stk>=0 ? AliTRDgeometry::GetDetector(ily, stk, sm) : -1;
4d6aee34 707 matrix = det>=0 ? fGeom->GetClusterMatrix(det) : NULL;
eb2b4f91 708
709 // check if supermodule/chamber is installed
710 if( !fGeom->GetSMstatus(sm) ||
711 stk<0. ||
712 fGeom->IsHole(ily, stk, sm) ||
713 !matrix ){
714 // propagate to the default radial position
715 if(fR[ily] > (fgkMaxStep + t.GetX()) && !PropagateToX(t, fR[ily], fgkMaxStep)){
716 n=-1;
717 t.SetStatus(AliTRDtrackV1::kPropagation);
41702fec 718 break;
719 }
eb2b4f91 720 if(!AdjustSector(&t)){
721 n=-1;
722 t.SetStatus(AliTRDtrackV1::kAdjustSector);
723 break;
724 }
725 if(TMath::Abs(t.GetSnp()) > fgkMaxSnp){
726 n=-1;
727 t.SetStatus(AliTRDtrackV1::kSnp);
728 break;
729 }
730 t.SetStatus(AliTRDtrackV1::kGeometry, ily);
41702fec 731 continue;
732 }
e3cf3d02 733
eb2b4f91 734 // retrieve rotation matrix for the current chamber
735 Double_t loc[] = {AliTRDgeometry::AnodePos()- driftLength, 0., 0.};
736 Double_t glb[] = {0., 0., 0.};
737 matrix->LocalToMaster(loc, glb);
738
739 // Propagate to the radial distance of the current layer
740 x = glb[0] - fgkMaxStep;
741 if(x > (fgkMaxStep + t.GetX()) && !PropagateToX(t, x, fgkMaxStep)){
742 n=-1;
743 t.SetStatus(AliTRDtrackV1::kPropagation);
744 break;
745 }
746 if(!AdjustSector(&t)){
747 n=-1;
748 t.SetStatus(AliTRDtrackV1::kAdjustSector);
749 break;
750 }
751 if(TMath::Abs(t.GetSnp()) > fgkMaxSnp) {
752 n=-1;
753 t.SetStatus(AliTRDtrackV1::kSnp);
754 break;
755 }
4d6aee34 756 Bool_t doRecalculate = kFALSE;
eb2b4f91 757 if(sm != t.GetSector()){
758 sm = t.GetSector();
4d6aee34 759 doRecalculate = kTRUE;
eb2b4f91 760 }
761 if(stk != fGeom->GetStack(z, ily)){
762 stk = fGeom->GetStack(z, ily);
4d6aee34 763 doRecalculate = kTRUE;
eb2b4f91 764 }
4d6aee34 765 if(doRecalculate){
eb2b4f91 766 det = AliTRDgeometry::GetDetector(ily, stk, sm);
767 if(!(matrix = fGeom->GetClusterMatrix(det))){
768 t.SetStatus(AliTRDtrackV1::kGeometry, ily);
769 continue;
770 }
771 matrix->LocalToMaster(loc, glb);
772 x = glb[0] - fgkMaxStep;
773 }
774
775 // check if track is well inside fiducial volume
776 if (!t.GetProlongation(x+fgkMaxStep, y, z)) {
777 n=-1;
778 t.SetStatus(AliTRDtrackV1::kProlongation);
779 break;
780 }
781 if(fGeom->IsOnBoundary(det, y, z, .5)){
782 t.SetStatus(AliTRDtrackV1::kBoundary, ily);
783 continue;
784 }
785 // mark track as entering the FIDUCIAL volume of TRD
e3cf3d02 786 if(kStoreIn){
787 t.SetTrackLow();
788 kStoreIn = kFALSE;
789 }
b1957d3c 790
eb2b4f91 791 ptrTracklet = tracklets[ily];
792 if(!ptrTracklet){ // BUILD TRACKLET
793 // check data in supermodule
794 if(!fTrSec[sm].GetNChambers()){
795 t.SetStatus(AliTRDtrackV1::kNoClusters, ily);
796 continue;
797 }
798 if(fTrSec[sm].GetX(ily) < 1.){
799 t.SetStatus(AliTRDtrackV1::kNoClusters, ily);
800 continue;
801 }
802
803 // check data in chamber
804 if(!(chamber = fTrSec[sm].GetChamber(stk, ily))){
805 t.SetStatus(AliTRDtrackV1::kNoClusters, ily);
806 continue;
807 }
4d6aee34 808 if(chamber->GetNClusters() < fgNTimeBins*fkReconstructor->GetRecoParam() ->GetFindableClusters()){
eb2b4f91 809 t.SetStatus(AliTRDtrackV1::kNoClusters, ily);
810 continue;
811 }
812 // build tracklet
813 ptrTracklet = new(&tracklet) AliTRDseedV1(det);
4d6aee34 814 ptrTracklet->SetReconstructor(fkReconstructor);
eb2b4f91 815 ptrTracklet->SetKink(t.IsKink());
816 ptrTracklet->SetPadPlane(fGeom->GetPadPlane(ily, stk));
817 ptrTracklet->SetX0(glb[0]+driftLength);
818 if(!tracklet.Init(&t)){
819 n=-1;
820 t.SetStatus(AliTRDtrackV1::kTrackletInit);
821 break;
822 }
823 if(!tracklet.AttachClusters(chamber, kTRUE)){
824 t.SetStatus(AliTRDtrackV1::kNoAttach, ily);
825 continue;
826 }
4d6aee34 827 if(tracklet.GetN() < fgNTimeBins*fkReconstructor->GetRecoParam() ->GetFindableClusters()){
eb2b4f91 828 t.SetStatus(AliTRDtrackV1::kNoClustersTracklet, ily);
829 continue;
830 }
831 ptrTracklet->UpdateUsed();
832 }
eb2b4f91 833 // propagate track to the radial position of the tracklet
834 ptrTracklet->UseClusters(); // TODO ? do we need this here ?
835 // fit tracklet no tilt correction
836 if(!ptrTracklet->Fit(kFALSE)){
837 t.SetStatus(AliTRDtrackV1::kNoFit, ily);
838 continue;
839 }
840 x = ptrTracklet->GetX(); //GetX0();
841 if(x > (fgkMaxStep + t.GetX()) && !PropagateToX(t, x, fgkMaxStep)) {
842 n=-1;
843 t.SetStatus(AliTRDtrackV1::kPropagation);
844 break;
845 }
846 if(!AdjustSector(&t)) {
847 n=-1;
848 t.SetStatus(AliTRDtrackV1::kAdjustSector);
849 break;
41702fec 850 }
eb2b4f91 851 if(TMath::Abs(t.GetSnp()) > fgkMaxSnp) {
852 n=-1;
853 t.SetStatus(AliTRDtrackV1::kSnp);
854 break;
855 }
81a6494d 856 if(kPropagateIn){
857 t.SetTrackLow();
858 kPropagateIn = kFALSE;
859 }
b72f4eaf 860 Double_t cov[3]; ptrTracklet->GetCovAt(x, cov);
861 Double_t p[2] = { ptrTracklet->GetY(), ptrTracklet->GetZ()};
862 Double_t chi2 = ((AliExternalTrackParam)t).GetPredictedChi2(p, cov);
a2fbb6ec 863 if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) > 2 && fkReconstructor->IsDebugStreaming()){
6e39bde4 864 Double_t ytrack = ptrTracklet->GetYref(0);
865 Double_t ztrack = ptrTracklet->GetZref(0);
866 Double_t ytracklet = ptrTracklet->GetYfit(0);
867 Double_t ztracklet = ptrTracklet->GetZfit(0);
868 Double_t phitrack = ptrTracklet->GetYref(1);
869 Double_t phitracklet = ptrTracklet->GetYfit(1);
870 Double_t thetatrack = ptrTracklet->GetZref(1);
871 Double_t thetatracklet = ptrTracklet->GetZfit(1);
872
a2fbb6ec 873 TTreeSRedirector &mystreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
6e39bde4 874 mystreamer << "FollowBackProlongation1"
875 << "il=" << ily
876 << "x=" << x
877 << "ytrack=" << ytrack
878 << "ztrack=" << ztrack
879 << "ytracklet=" << ytracklet
880 << "ztracklet=" << ztracklet
881 << "phitrack=" << phitrack
882 << "thetatrack=" << thetatrack
883 << "phitracklet=" << phitracklet
884 << "thetatracklet=" << thetatracklet
885 << "chi2=" << chi2
886 << "\n";
887 }
888 // update Kalman with the TRD measurement
b72f4eaf 889 if(chi2>1e+10){ // TODO
eb2b4f91 890 t.SetStatus(AliTRDtrackV1::kChi2, ily);
891 continue;
892 }
b72f4eaf 893 if(!t.Update(p, cov, chi2)) {
eb2b4f91 894 n=-1;
895 t.SetStatus(AliTRDtrackV1::kUpdate);
896 break;
897 }
b72f4eaf 898 // fill residuals ?!
899 AliTracker::FillResiduals(&t, p, cov, ptrTracklet->GetVolumeId());
900
eb2b4f91 901
902 // load tracklet to the tracker
16cca13f 903 ptrTracklet->Update(&t);
eb2b4f91 904 ptrTracklet = SetTracklet(ptrTracklet);
905 t.SetTracklet(ptrTracklet, fTracklets->GetEntriesFast()-1);
906 n += ptrTracklet->GetN();
907
41702fec 908 // Reset material budget if 2 consecutive gold
eb2b4f91 909// if(ilayer>0 && t.GetTracklet(ilayer-1) && ptrTracklet->GetN() + t.GetTracklet(ilayer-1)->GetN() > 20) t.SetBudget(2, 0.);
41702fec 910
911 // Make backup of the track until is gold
912 // TO DO update quality check of the track.
913 // consider comparison with fTimeBinsRange
914 Float_t ratio0 = ptrTracklet->GetN() / Float_t(fgNTimeBins);
915 //Float_t ratio1 = Float_t(t.GetNumberOfClusters()+1) / Float_t(t.GetNExpected()+1);
41702fec 916
eb2b4f91 917 if( (chi2 < 18.0) &&
41702fec 918 (ratio0 > 0.8) &&
919 //(ratio1 > 0.6) &&
920 //(ratio0+ratio1 > 1.5) &&
921 (t.GetNCross() == 0) &&
922 (TMath::Abs(t.GetSnp()) < 0.85) &&
e3cf3d02 923 (t.GetNumberOfClusters() > 20)){
924 t.MakeBackupTrack();
925 }
053767a4 926 } // end layers loop
eb2b4f91 927 //printf("clusters[%d] chi2[%f] x[%f] status[%d ", n, t.GetChi2(), t.GetX(), t.GetStatusTRD());
928 //for(int i=0; i<6; i++) printf("%d ", t.GetStatusTRD(i)); printf("]\n");
41702fec 929
a2fbb6ec 930 if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) > 1 && fkReconstructor->IsDebugStreaming()){
931 TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
41702fec 932 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
eb2b4f91 933 AliTRDtrackV1 track(t);
934 track.SetOwner();
41702fec 935 cstreamer << "FollowBackProlongation"
eb2b4f91 936 << "EventNumber=" << eventNumber
937 << "ncl=" << n
938 << "track.=" << &track
41702fec 939 << "\n";
940 }
941
eb2b4f91 942 return n;
0906e73e 943}
944
eb38ed55 945//_________________________________________________________________________
4d6aee34 946Float_t AliTRDtrackerV1::FitRieman(AliTRDseedV1 *tracklets, Double_t *chi2, Int_t *const planes){
41702fec 947 //
948 // Fits a Riemann-circle to the given points without tilting pad correction.
949 // The fit is performed using an instance of the class AliRieman (equations
950 // and transformations see documentation of this class)
951 // Afterwards all the tracklets are Updated
952 //
953 // Parameters: - Array of tracklets (AliTRDseedV1)
954 // - Storage for the chi2 values (beginning with direction z)
955 // - Seeding configuration
956 // Output: - The curvature
957 //
958 AliRieman *fitter = AliTRDtrackerV1::GetRiemanFitter();
959 fitter->Reset();
960 Int_t allplanes[] = {0, 1, 2, 3, 4, 5};
961 Int_t *ppl = &allplanes[0];
962 Int_t maxLayers = 6;
963 if(planes){
964 maxLayers = 4;
965 ppl = planes;
966 }
967 for(Int_t il = 0; il < maxLayers; il++){
968 if(!tracklets[ppl[il]].IsOK()) continue;
e3cf3d02 969 fitter->AddPoint(tracklets[ppl[il]].GetX0(), tracklets[ppl[il]].GetYfit(0), tracklets[ppl[il]].GetZfit(0),1,10);
41702fec 970 }
971 fitter->Update();
972 // Set the reference position of the fit and calculate the chi2 values
973 memset(chi2, 0, sizeof(Double_t) * 2);
974 for(Int_t il = 0; il < maxLayers; il++){
975 // Reference positions
976 tracklets[ppl[il]].Init(fitter);
977
978 // chi2
979 if((!tracklets[ppl[il]].IsOK()) && (!planes)) continue;
980 chi2[0] += tracklets[ppl[il]].GetChi2Y();
981 chi2[1] += tracklets[ppl[il]].GetChi2Z();
982 }
983 return fitter->GetC();
eb38ed55 984}
985
986//_________________________________________________________________________
987void AliTRDtrackerV1::FitRieman(AliTRDcluster **seedcl, Double_t chi2[2])
988{
41702fec 989 //
990 // Performs a Riemann helix fit using the seedclusters as spacepoints
991 // Afterwards the chi2 values are calculated and the seeds are updated
992 //
993 // Parameters: - The four seedclusters
994 // - The tracklet array (AliTRDseedV1)
995 // - The seeding configuration
996 // - Chi2 array
997 //
998 // debug level 2
999 //
1000 AliRieman *fitter = AliTRDtrackerV1::GetRiemanFitter();
1001 fitter->Reset();
a3743898 1002 for(Int_t i = 0; i < 4; i++){
a3743898 1003 fitter->AddPoint(seedcl[i]->GetX(), seedcl[i]->GetY(), seedcl[i]->GetZ(), 1., 10.);
1004 }
41702fec 1005 fitter->Update();
1006
1007
1008 // Update the seed and calculated the chi2 value
1009 chi2[0] = 0; chi2[1] = 0;
1010 for(Int_t ipl = 0; ipl < kNSeedPlanes; ipl++){
1011 // chi2
1012 chi2[0] += (seedcl[ipl]->GetZ() - fitter->GetZat(seedcl[ipl]->GetX())) * (seedcl[ipl]->GetZ() - fitter->GetZat(seedcl[ipl]->GetX()));
1013 chi2[1] += (seedcl[ipl]->GetY() - fitter->GetYat(seedcl[ipl]->GetX())) * (seedcl[ipl]->GetY() - fitter->GetYat(seedcl[ipl]->GetX()));
1014 }
eb38ed55 1015}
1016
1017
1018//_________________________________________________________________________
1019Float_t AliTRDtrackerV1::FitTiltedRiemanConstraint(AliTRDseedV1 *tracklets, Double_t zVertex)
1020{
41702fec 1021 //
1022 // Fits a helix to the clusters. Pad tilting is considered. As constraint it is
1023 // assumed that the vertex position is set to 0.
1024 // This method is very usefull for high-pt particles
1025 // Basis for the fit: (x - x0)^2 + (y - y0)^2 - R^2 = 0
1026 // x0, y0: Center of the circle
1027 // Measured y-position: ymeas = y - tan(phiT)(zc - zt)
1028 // zc: center of the pad row
1029 // Equation which has to be fitted (after transformation):
1030 // a + b * u + e * v + 2*(ymeas + tan(phiT)(z - zVertex))*t = 0
1031 // Transformation:
1032 // t = 1/(x^2 + y^2)
1033 // u = 2 * x * t
1034 // v = 2 * x * tan(phiT) * t
1035 // Parameters in the equation:
1036 // a = -1/y0, b = x0/y0, e = dz/dx
1037 //
1038 // The Curvature is calculated by the following equation:
1039 // - curv = a/Sqrt(b^2 + 1) = 1/R
1040 // Parameters: - the 6 tracklets
1041 // - the Vertex constraint
1042 // Output: - the Chi2 value of the track
1043 //
1044 // debug level 5
1045 //
1046
1047 TLinearFitter *fitter = GetTiltedRiemanFitterConstraint();
1048 fitter->StoreData(kTRUE);
1049 fitter->ClearPoints();
4d6aee34 1050 AliTRDcluster *cl = NULL;
41702fec 1051
1052 Float_t x, y, z, w, t, error, tilt;
1053 Double_t uvt[2];
1054 Int_t nPoints = 0;
053767a4 1055 for(Int_t ilr = 0; ilr < AliTRDgeometry::kNlayer; ilr++){
1056 if(!tracklets[ilr].IsOK()) continue;
8d2bec9e 1057 for(Int_t itb = 0; itb < AliTRDseedV1::kNclusters; itb++){
053767a4 1058 if(!tracklets[ilr].IsUsable(itb)) continue;
1059 cl = tracklets[ilr].GetClusters(itb);
1742f24c 1060 if(!cl->IsInChamber()) continue;
41702fec 1061 x = cl->GetX();
1062 y = cl->GetY();
1063 z = cl->GetZ();
053767a4 1064 tilt = tracklets[ilr].GetTilt();
41702fec 1065 // Transformation
1066 t = 1./(x * x + y * y);
1067 uvt[0] = 2. * x * t;
1068 uvt[1] = 2. * x * t * tilt ;
1069 w = 2. * (y + tilt * (z - zVertex)) * t;
78b7d24c 1070 error = 2. * TMath::Sqrt(cl->GetSigmaY2()+tilt*tilt*cl->GetSigmaZ2()) * t;
41702fec 1071 fitter->AddPoint(uvt, w, error);
1072 nPoints++;
1073 }
1074 }
e17f4785 1075 fitter->Eval();
41702fec 1076
1077 // Calculate curvature
1078 Double_t a = fitter->GetParameter(0);
1079 Double_t b = fitter->GetParameter(1);
1080 Double_t curvature = a/TMath::Sqrt(b*b + 1);
1081
1082 Float_t chi2track = fitter->GetChisquare()/Double_t(nPoints);
1083 for(Int_t ip = 0; ip < AliTRDtrackerV1::kNPlanes; ip++)
e3cf3d02 1084 tracklets[ip].SetC(curvature);
41702fec 1085
a2fbb6ec 1086/* if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker()) >= 5){
41702fec 1087 //Linear Model on z-direction
1088 Double_t xref = CalculateReferenceX(tracklets); // Relative to the middle of the stack
1089 Double_t slope = fitter->GetParameter(2);
1090 Double_t zref = slope * xref;
1091 Float_t chi2Z = CalculateChi2Z(tracklets, zref, slope, xref);
1092 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
1093 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
4d6aee34 1094 TTreeSRedirector &treeStreamer = *fkReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
41702fec 1095 treeStreamer << "FitTiltedRiemanConstraint"
1096 << "EventNumber=" << eventNumber
1097 << "CandidateNumber=" << candidateNumber
1098 << "Curvature=" << curvature
1099 << "Chi2Track=" << chi2track
1100 << "Chi2Z=" << chi2Z
1101 << "zref=" << zref
1102 << "\n";
3a039a31 1103 }*/
41702fec 1104 return chi2track;
eb38ed55 1105}
1106
1107//_________________________________________________________________________
1108Float_t AliTRDtrackerV1::FitTiltedRieman(AliTRDseedV1 *tracklets, Bool_t sigError)
1109{
41702fec 1110 //
1111 // Performs a Riemann fit taking tilting pad correction into account
1112 // The equation of a Riemann circle, where the y position is substituted by the
1113 // measured y-position taking pad tilting into account, has to be transformed
1114 // into a 4-dimensional hyperplane equation
1115 // Riemann circle: (x-x0)^2 + (y-y0)^2 -R^2 = 0
1116 // Measured y-Position: ymeas = y - tan(phiT)(zc - zt)
1117 // zc: center of the pad row
1118 // zt: z-position of the track
1119 // The z-position of the track is assumed to be linear dependent on the x-position
1120 // Transformed equation: a + b * u + c * t + d * v + e * w - 2 * (ymeas + tan(phiT) * zc) * t = 0
1121 // Transformation: u = 2 * x * t
1122 // v = 2 * tan(phiT) * t
1123 // w = 2 * tan(phiT) * (x - xref) * t
1124 // t = 1 / (x^2 + ymeas^2)
1125 // Parameters: a = -1/y0
1126 // b = x0/y0
1127 // c = (R^2 -x0^2 - y0^2)/y0
1128 // d = offset
1129 // e = dz/dx
1130 // If the offset respectively the slope in z-position is impossible, the parameters are fixed using
1131 // results from the simple riemann fit. Afterwards the fit is redone.
1132 // The curvature is calculated according to the formula:
1133 // curv = a/(1 + b^2 + c*a) = 1/R
1134 //
1135 // Paramters: - Array of tracklets (connected to the track candidate)
1136 // - Flag selecting the error definition
1137 // Output: - Chi2 values of the track (in Parameter list)
1138 //
1139 TLinearFitter *fitter = GetTiltedRiemanFitter();
1140 fitter->StoreData(kTRUE);
1141 fitter->ClearPoints();
1142 AliTRDLeastSquare zfitter;
4d6aee34 1143 AliTRDcluster *cl = NULL;
41702fec 1144
1145 Double_t xref = CalculateReferenceX(tracklets);
6e39bde4 1146 Double_t x, y, z, t, tilt, dx, w, we, erry, errz;
1147 Double_t uvt[4], sumPolY[5], sumPolZ[3];
1148 memset(sumPolY, 0, sizeof(Double_t) * 5);
1149 memset(sumPolZ, 0, sizeof(Double_t) * 3);
41702fec 1150 Int_t nPoints = 0;
1151 // Containers for Least-square fitter
1152 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1153 if(!tracklets[ipl].IsOK()) continue;
ed15ef4f 1154 tilt = tracklets[ipl].GetTilt();
8d2bec9e 1155 for(Int_t itb = 0; itb < AliTRDseedV1::kNclusters; itb++){
41702fec 1156 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1742f24c 1157 if(!cl->IsInChamber()) continue;
41702fec 1158 if (!tracklets[ipl].IsUsable(itb)) continue;
1159 x = cl->GetX();
1160 y = cl->GetY();
1161 z = cl->GetZ();
41702fec 1162 dx = x - xref;
1163 // Transformation
1164 t = 1./(x*x + y*y);
1165 uvt[0] = 2. * x * t;
1166 uvt[1] = t;
1167 uvt[2] = 2. * tilt * t;
1168 uvt[3] = 2. * tilt * dx * t;
1169 w = 2. * (y + tilt*z) * t;
1170 // error definition changes for the different calls
1171 we = 2. * t;
78b7d24c 1172 we *= sigError ? TMath::Sqrt(cl->GetSigmaY2()+tilt*tilt*cl->GetSigmaZ2()) : 0.2;
41702fec 1173 fitter->AddPoint(uvt, w, we);
1174 zfitter.AddPoint(&x, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
6e39bde4 1175 // adding points for covariance matrix estimation
1176 erry = 1./(TMath::Sqrt(cl->GetSigmaY2()) + 0.1); // 0.1 is a systematic error (due to misalignment and miscalibration)
1177 erry *= erry;
1178 errz = 1./cl->GetSigmaZ2();
1179 for(Int_t ipol = 0; ipol < 5; ipol++){
1180 sumPolY[ipol] += erry;
1181 erry *= x;
1182 if(ipol < 3){
1183 sumPolZ[ipol] += errz;
1184 errz *= x;
1185 }
1186 }
41702fec 1187 nPoints++;
1188 }
1189 }
e17f4785 1190 fitter->Eval();
41702fec 1191 zfitter.Eval();
1192
1193 Double_t offset = fitter->GetParameter(3);
1194 Double_t slope = fitter->GetParameter(4);
1195
1196 // Linear fitter - not possible to make boundaries
1197 // Do not accept non possible z and dzdx combinations
1198 Bool_t acceptablez = kTRUE;
1199 Double_t zref = 0.0;
1200 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
1201 if(!tracklets[iLayer].IsOK()) continue;
1202 zref = offset + slope * (tracklets[iLayer].GetX0() - xref);
e3cf3d02 1203 if (TMath::Abs(tracklets[iLayer].GetZfit(0) - zref) > tracklets[iLayer].GetPadLength() * 0.5 + 1.0)
41702fec 1204 acceptablez = kFALSE;
1205 }
1206 if (!acceptablez) {
1207 Double_t dzmf = zfitter.GetFunctionParameter(1);
1208 Double_t zmf = zfitter.GetFunctionValue(&xref);
1209 fgTiltedRieman->FixParameter(3, zmf);
1210 fgTiltedRieman->FixParameter(4, dzmf);
e17f4785 1211 fitter->Eval();
41702fec 1212 fitter->ReleaseParameter(3);
1213 fitter->ReleaseParameter(4);
1214 offset = fitter->GetParameter(3);
1215 slope = fitter->GetParameter(4);
1216 }
1217
1218 // Calculate Curvarture
1219 Double_t a = fitter->GetParameter(0);
1220 Double_t b = fitter->GetParameter(1);
1221 Double_t c = fitter->GetParameter(2);
1222 Double_t curvature = 1.0 + b*b - c*a;
1223 if (curvature > 0.0)
1224 curvature = a / TMath::Sqrt(curvature);
1225
1226 Double_t chi2track = fitter->GetChisquare()/Double_t(nPoints);
1227
6e39bde4 1228 // Prepare error calculation
1229 TMatrixD covarPolY(3,3);
1230 covarPolY(0,0) = sumPolY[0]; covarPolY(1,1) = sumPolY[2]; covarPolY(2,2) = sumPolY[4];
1231 covarPolY(0,1) = covarPolY(1,0) = sumPolY[1];
1232 covarPolY(0,2) = covarPolY(2,0) = sumPolY[2];
1233 covarPolY(2,1) = covarPolY(1,2) = sumPolY[3];
1234 covarPolY.Invert();
1235 TMatrixD covarPolZ(2,2);
1236 covarPolZ(0,0) = sumPolZ[0]; covarPolZ(1,1) = sumPolZ[2];
1237 covarPolZ(1,0) = covarPolZ(0,1) = sumPolZ[1];
1238 covarPolZ.Invert();
1239
41702fec 1240 // Update the tracklets
6e39bde4 1241 Double_t x1, dy, dz;
1242 Double_t cov[15];
1243 memset(cov, 0, sizeof(Double_t) * 15);
41702fec 1244 for(Int_t iLayer = 0; iLayer < AliTRDtrackerV1::kNPlanes; iLayer++) {
1245
1246 x = tracklets[iLayer].GetX0();
6e39bde4 1247 x1 = x - xref;
41702fec 1248 y = 0;
1249 z = 0;
1250 dy = 0;
1251 dz = 0;
6e39bde4 1252 memset(cov, 0, sizeof(Double_t) * 3);
1253 TMatrixD transform(3,3);
1254 transform(0,0) = 1;
1255 transform(0,1) = x;
1256 transform(0,2) = x*x;
1257 transform(1,1) = 1;
1258 transform(1,2) = x;
1259 transform(2,2) = 1;
1260 TMatrixD covariance(transform, TMatrixD::kMult, covarPolY);
1261 covariance *= transform.T();
1262 TMatrixD transformZ(2,2);
1263 transformZ(0,0) = transformZ(1,1) = 1;
1264 transformZ(0,1) = x;
1265 TMatrixD covarZ(transformZ, TMatrixD::kMult, covarPolZ);
1266 covarZ *= transformZ.T();
41702fec 1267 // y: R^2 = (x - x0)^2 + (y - y0)^2
1268 // => y = y0 +/- Sqrt(R^2 - (x - x0)^2)
1269 // R = Sqrt() = 1/Curvature
1270 // => y = y0 +/- Sqrt(1/Curvature^2 - (x - x0)^2)
1271 Double_t res = (x * a + b); // = (x - x0)/y0
1272 res *= res;
1273 res = 1.0 - c * a + b * b - res; // = (R^2 - (x - x0)^2)/y0^2
1274 if (res >= 0) {
1275 res = TMath::Sqrt(res);
1276 y = (1.0 - res) / a;
1277 }
6e39bde4 1278 cov[0] = covariance(0,0);
1279 cov[2] = covarZ(0,0);
1280 cov[1] = 0.;
41702fec 1281
1282 // dy: R^2 = (x - x0)^2 + (y - y0)^2
1283 // => y = +/- Sqrt(R^2 - (x - x0)^2) + y0
1284 // => dy/dx = (x - x0)/Sqrt(R^2 - (x - x0)^2)
1285 // Curvature: cr = 1/R = a/Sqrt(1 + b^2 - c*a)
1286 // => dy/dx = (x - x0)/(1/(cr^2) - (x - x0)^2)
1287 Double_t x0 = -b / a;
1288 if (-c * a + b * b + 1 > 0) {
1289 if (1.0/(curvature * curvature) - (x - x0) * (x - x0) > 0.0) {
6e39bde4 1290 Double_t yderiv = (x - x0) / TMath::Sqrt(1.0/(curvature * curvature) - (x - x0) * (x - x0));
1291 if (a < 0) yderiv *= -1.0;
1292 dy = yderiv;
41702fec 1293 }
1294 }
1295 z = offset + slope * (x - xref);
1296 dz = slope;
1297 tracklets[iLayer].SetYref(0, y);
1298 tracklets[iLayer].SetYref(1, dy);
1299 tracklets[iLayer].SetZref(0, z);
1300 tracklets[iLayer].SetZref(1, dz);
1301 tracklets[iLayer].SetC(curvature);
6e39bde4 1302 tracklets[iLayer].SetCovRef(cov);
41702fec 1303 tracklets[iLayer].SetChi2(chi2track);
1304 }
1305
a2fbb6ec 1306/* if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) >=5){
1307 TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
41702fec 1308 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
1309 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
1310 Double_t chi2z = CalculateChi2Z(tracklets, offset, slope, xref);
1311 cstreamer << "FitTiltedRieman0"
1312 << "EventNumber=" << eventNumber
1313 << "CandidateNumber=" << candidateNumber
1314 << "xref=" << xref
1315 << "Chi2Z=" << chi2z
1316 << "\n";
3a039a31 1317 }*/
41702fec 1318 return chi2track;
eb38ed55 1319}
1320
3b57a3f7 1321
9e333711 1322//____________________________________________________________________
6e4d4425 1323Double_t AliTRDtrackerV1::FitLine(const AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t err, Int_t np, AliTrackPoint *points)
9e333711 1324{
4d6aee34 1325 //
1326 // Fit track with a staight line
1327 // Fills an AliTrackPoint array with np points
1328 // Function should be used to refit tracks when no magnetic field was on
1329 //
9e333711 1330 AliTRDLeastSquare yfitter, zfitter;
4d6aee34 1331 AliTRDcluster *cl = NULL;
9e333711 1332
4d6aee34 1333 AliTRDseedV1 work[kNPlanes], *tracklet = NULL;
9e333711 1334 if(!tracklets){
1335 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1336 if(!(tracklet = track->GetTracklet(ipl))) continue;
1337 if(!tracklet->IsOK()) continue;
1338 new(&work[ipl]) AliTRDseedV1(*tracklet);
1339 }
1340 tracklets = &work[0];
1341 }
1342
1343 Double_t xref = CalculateReferenceX(tracklets);
1344 Double_t x, y, z, dx, ye, yr, tilt;
1345 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1346 if(!tracklets[ipl].IsOK()) continue;
1347 for(Int_t itb = 0; itb < fgNTimeBins; itb++){
1348 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1349 if (!tracklets[ipl].IsUsable(itb)) continue;
1350 x = cl->GetX();
1351 z = cl->GetZ();
1352 dx = x - xref;
1353 zfitter.AddPoint(&dx, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
1354 }
1355 }
1356 zfitter.Eval();
1357 Double_t z0 = zfitter.GetFunctionParameter(0);
1358 Double_t dzdx = zfitter.GetFunctionParameter(1);
1359 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1360 if(!tracklets[ipl].IsOK()) continue;
1361 for(Int_t itb = 0; itb < fgNTimeBins; itb++){
1362 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1363 if (!tracklets[ipl].IsUsable(itb)) continue;
1364 x = cl->GetX();
1365 y = cl->GetY();
1366 z = cl->GetZ();
1367 tilt = tracklets[ipl].GetTilt();
1368 dx = x - xref;
1369 yr = y + tilt*(z - z0 - dzdx*dx);
1370 // error definition changes for the different calls
1371 ye = tilt*TMath::Sqrt(cl->GetSigmaZ2());
1372 ye += err ? tracklets[ipl].GetSigmaY() : 0.2;
1373 yfitter.AddPoint(&dx, yr, ye);
1374 }
1375 }
1376 yfitter.Eval();
1377 Double_t y0 = yfitter.GetFunctionParameter(0);
1378 Double_t dydx = yfitter.GetFunctionParameter(1);
1379 Double_t chi2 = 0.;//yfitter.GetChisquare()/Double_t(nPoints);
1380
1381 //update track points array
1382 if(np && points){
1383 Float_t xyz[3];
1384 for(int ip=0; ip<np; ip++){
1385 points[ip].GetXYZ(xyz);
1386 xyz[1] = y0 + dydx * (xyz[0] - xref);
1387 xyz[2] = z0 + dzdx * (xyz[0] - xref);
1388 points[ip].SetXYZ(xyz);
1389 }
1390 }
1391 return chi2;
1392}
1393
1394
3b57a3f7 1395//_________________________________________________________________________
6e4d4425 1396Double_t AliTRDtrackerV1::FitRiemanTilt(const AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t sigError, Int_t np, AliTrackPoint *points)
3b57a3f7 1397{
0fa1a8ee 1398//
1399// Performs a Riemann fit taking tilting pad correction into account
1400//
1401// Paramters: - Array of tracklets (connected to the track candidate)
1402// - Flag selecting the error definition
1403// Output: - Chi2 values of the track (in Parameter list)
1404//
1405// The equations which has to be solved simultaneously are:
1406// BEGIN_LATEX
1407// R^{2} = (x-x_{0})^{2} + (y^{*}-y_{0})^{2}
1408// y^{*} = y - tg(h)(z - z_{t})
1409// z_{t} = z_{0}+dzdx*(x-x_{r})
1410// END_LATEX
1411// with (x, y, z) the coordinate of the cluster, (x_0, y_0, z_0) the coordinate of the center of the Riemann circle,
1412// R its radius, x_r a constant refrence radial position in the middle of the TRD stack and dzdx the slope of the
1413// track in the x-z plane. Using the following transformations
1414// BEGIN_LATEX
1415// t = 1 / (x^{2} + y^{2})
1416// u = 2 * x * t
1417// v = 2 * tan(h) * t
1418// w = 2 * tan(h) * (x - x_{r}) * t
1419// END_LATEX
1420// One gets the following linear equation
1421// BEGIN_LATEX
1422// a + b * u + c * t + d * v + e * w = 2 * (y + tg(h) * z) * t
1423// END_LATEX
1424// where the coefficients have the following meaning
1425// BEGIN_LATEX
1426// a = -1/y_{0}
1427// b = x_{0}/y_{0}
1428// c = (R^{2} -x_{0}^{2} - y_{0}^{2})/y_{0}
1429// d = z_{0}
1430// e = dz/dx
1431// END_LATEX
1432// The error calculation for the free term is thus
1433// BEGIN_LATEX
1434// #sigma = 2 * #sqrt{#sigma^{2}_{y} + (tilt corr ...) + tg^{2}(h) * #sigma^{2}_{z}} * t
1435// END_LATEX
1436//
1437// From this simple model one can compute chi^2 estimates and a rough approximation of pt from the curvature according
1438// to the formula:
1439// BEGIN_LATEX
1440// C = 1/R = a/(1 + b^{2} + c*a)
1441// END_LATEX
1442//
1443// Authors
1444// M.Ivanov <M.Ivanov@gsi.de>
1445// A.Bercuci <A.Bercuci@gsi.de>
1446// M.Fasel <M.Fasel@gsi.de>
1447
41702fec 1448 TLinearFitter *fitter = GetTiltedRiemanFitter();
1449 fitter->StoreData(kTRUE);
1450 fitter->ClearPoints();
1451 AliTRDLeastSquare zfitter;
4d6aee34 1452 AliTRDcluster *cl = NULL;
3b57a3f7 1453
4d6aee34 1454 AliTRDseedV1 work[kNPlanes], *tracklet = NULL;
3b57a3f7 1455 if(!tracklets){
1456 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1457 if(!(tracklet = track->GetTracklet(ipl))) continue;
1458 if(!tracklet->IsOK()) continue;
1459 new(&work[ipl]) AliTRDseedV1(*tracklet);
1460 }
1461 tracklets = &work[0];
1462 }
1463
41702fec 1464 Double_t xref = CalculateReferenceX(tracklets);
1465 Double_t x, y, z, t, tilt, dx, w, we;
1466 Double_t uvt[4];
1467 Int_t nPoints = 0;
1468 // Containers for Least-square fitter
1469 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1470 if(!tracklets[ipl].IsOK()) continue;
8d2bec9e 1471 for(Int_t itb = 0; itb < AliTRDseedV1::kNclusters; itb++){
41702fec 1472 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1473 if (!tracklets[ipl].IsUsable(itb)) continue;
1474 x = cl->GetX();
1475 y = cl->GetY();
1476 z = cl->GetZ();
1477 tilt = tracklets[ipl].GetTilt();
1478 dx = x - xref;
1479 // Transformation
1480 t = 1./(x*x + y*y);
1481 uvt[0] = 2. * x * t;
1482 uvt[1] = t;
1483 uvt[2] = 2. * tilt * t;
1484 uvt[3] = 2. * tilt * dx * t;
1485 w = 2. * (y + tilt*z) * t;
1486 // error definition changes for the different calls
1487 we = 2. * t;
f29f13a6 1488 we *= sigError ? TMath::Sqrt(cl->GetSigmaY2()) : 0.2;
41702fec 1489 fitter->AddPoint(uvt, w, we);
1490 zfitter.AddPoint(&x, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
1491 nPoints++;
1492 }
1493 }
aec26713 1494 if(fitter->Eval()) return 1.E10;
1495
41702fec 1496 Double_t z0 = fitter->GetParameter(3);
1497 Double_t dzdx = fitter->GetParameter(4);
3b57a3f7 1498
1499
1500 // Linear fitter - not possible to make boundaries
1501 // Do not accept non possible z and dzdx combinations
1502 Bool_t accept = kTRUE;
1503 Double_t zref = 0.0;
1504 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
1505 if(!tracklets[iLayer].IsOK()) continue;
1506 zref = z0 + dzdx * (tracklets[iLayer].GetX0() - xref);
e3cf3d02 1507 if (TMath::Abs(tracklets[iLayer].GetZfit(0) - zref) > tracklets[iLayer].GetPadLength() * 0.5 + 1.0)
3b57a3f7 1508 accept = kFALSE;
1509 }
1510 if (!accept) {
41702fec 1511 zfitter.Eval();
3b57a3f7 1512 Double_t dzmf = zfitter.GetFunctionParameter(1);
1513 Double_t zmf = zfitter.GetFunctionValue(&xref);
1514 fitter->FixParameter(3, zmf);
1515 fitter->FixParameter(4, dzmf);
e17f4785 1516 fitter->Eval();
3b57a3f7 1517 fitter->ReleaseParameter(3);
1518 fitter->ReleaseParameter(4);
1519 z0 = fitter->GetParameter(3); // = zmf ?
1520 dzdx = fitter->GetParameter(4); // = dzmf ?
1521 }
1522
1523 // Calculate Curvature
1524 Double_t a = fitter->GetParameter(0);
1525 Double_t b = fitter->GetParameter(1);
1526 Double_t c = fitter->GetParameter(2);
1527 Double_t y0 = 1. / a;
1528 Double_t x0 = -b * y0;
a015e406 1529 Double_t tmp = y0*y0 + x0*x0 - c*y0;
1530 if(tmp<=0.) return 1.E10;
4d6aee34 1531 Double_t radius = TMath::Sqrt(tmp);
1532 Double_t curvature = 1.0 + b*b - c*a;
1533 if (curvature > 0.0) curvature = a / TMath::Sqrt(curvature);
3b57a3f7 1534
1535 // Calculate chi2 of the fit
1536 Double_t chi2 = fitter->GetChisquare()/Double_t(nPoints);
1537
1538 // Update the tracklets
1539 if(!track){
1540 for(Int_t ip = 0; ip < kNPlanes; ip++) {
1541 x = tracklets[ip].GetX0();
4d6aee34 1542 tmp = radius*radius-(x-x0)*(x-x0);
a015e406 1543 if(tmp <= 0.) continue;
1544 tmp = TMath::Sqrt(tmp);
3b57a3f7 1545
1546 // y: R^2 = (x - x0)^2 + (y - y0)^2
1547 // => y = y0 +/- Sqrt(R^2 - (x - x0)^2)
1548 tracklets[ip].SetYref(0, y0 - (y0>0.?1.:-1)*tmp);
1549 // => dy/dx = (x - x0)/Sqrt(R^2 - (x - x0)^2)
1550 tracklets[ip].SetYref(1, (x - x0) / tmp);
1551 tracklets[ip].SetZref(0, z0 + dzdx * (x - xref));
1552 tracklets[ip].SetZref(1, dzdx);
4d6aee34 1553 tracklets[ip].SetC(curvature);
3b57a3f7 1554 tracklets[ip].SetChi2(chi2);
1555 }
1556 }
3b57a3f7 1557 //update track points array
1558 if(np && points){
1559 Float_t xyz[3];
1560 for(int ip=0; ip<np; ip++){
1561 points[ip].GetXYZ(xyz);
4d6aee34 1562 xyz[1] = TMath::Abs(xyz[0] - x0) > radius ? 100. : y0 - (y0>0.?1.:-1.)*TMath::Sqrt((radius-(xyz[0]-x0))*(radius+(xyz[0]-x0)));
3b57a3f7 1563 xyz[2] = z0 + dzdx * (xyz[0] - xref);
1564 points[ip].SetXYZ(xyz);
1565 }
1566 }
1567
3b57a3f7 1568 return chi2;
1569}
1570
1571
1bf51039 1572//____________________________________________________________________
e17f4785 1573Double_t AliTRDtrackerV1::FitKalman(AliTRDtrackV1 *track, AliTRDseedV1 * const tracklets, Bool_t up, Int_t np, AliTrackPoint *points)
1bf51039 1574{
1575// Kalman filter implementation for the TRD.
1576// It returns the positions of the fit in the array "points"
1577//
1578// Author : A.Bercuci@gsi.de
1579
3cfaffa4 1580 // printf("Start track @ x[%f]\n", track->GetX());
1bf51039 1581
1582 //prepare marker points along the track
1583 Int_t ip = np ? 0 : 1;
1584 while(ip<np){
1585 if((up?-1:1) * (track->GetX() - points[ip].GetX()) > 0.) break;
1586 //printf("AliTRDtrackerV1::FitKalman() : Skip track marker x[%d] = %7.3f. Before track start ( %7.3f ).\n", ip, points[ip].GetX(), track->GetX());
1587 ip++;
1588 }
1589 //if(points) printf("First marker point @ x[%d] = %f\n", ip, points[ip].GetX());
1590
1591
4d6aee34 1592 AliTRDseedV1 tracklet, *ptrTracklet = NULL;
1bf51039 1593
1594 //Loop through the TRD planes
1595 for (Int_t jplane = 0; jplane < kNPlanes; jplane++) {
1596 // GET TRACKLET OR BUILT IT
1597 Int_t iplane = up ? jplane : kNPlanes - 1 - jplane;
1598 if(tracklets){
e17f4785 1599 if(!(ptrTracklet = &tracklets[iplane])) continue;
1bf51039 1600 }else{
1601 if(!(ptrTracklet = track->GetTracklet(iplane))){
4d6aee34 1602 /*AliTRDtrackerV1 *tracker = NULL;
a2fbb6ec 1603 if(!(tracker = dynamic_cast<AliTRDtrackerV1*>( AliTRDrecoParam:Tracker()))) continue;
1bf51039 1604 ptrTracklet = new(&tracklet) AliTRDseedV1(iplane);
1605 if(!tracker->MakeTracklet(ptrTracklet, track)) */
1606 continue;
1607 }
1608 }
1609 if(!ptrTracklet->IsOK()) continue;
1610
1611 Double_t x = ptrTracklet->GetX0();
1612
1613 while(ip < np){
1614 //don't do anything if next marker is after next update point.
1615 if((up?-1:1) * (points[ip].GetX() - x) - fgkMaxStep < 0) break;
1bf51039 1616 if(((up?-1:1) * (points[ip].GetX() - track->GetX()) < 0) && !PropagateToX(*track, points[ip].GetX(), fgkMaxStep)) return -1.;
1617
1618 Double_t xyz[3]; // should also get the covariance
3cfaffa4 1619 track->GetXYZ(xyz);
1620 track->Global2LocalPosition(xyz, track->GetAlpha());
1621 points[ip].SetXYZ(xyz[0], xyz[1], xyz[2]);
1bf51039 1622 ip++;
1623 }
3cfaffa4 1624 // printf("plane[%d] tracklet[%p] x[%f]\n", iplane, ptrTracklet, x);
1bf51039 1625
3cfaffa4 1626 // Propagate closer to the next update point
1bf51039 1627 if(((up?-1:1) * (x - track->GetX()) + fgkMaxStep < 0) && !PropagateToX(*track, x + (up?-1:1)*fgkMaxStep, fgkMaxStep)) return -1.;
1628
1629 if(!AdjustSector(track)) return -1;
1630 if(TMath::Abs(track->GetSnp()) > fgkMaxSnp) return -1;
1631
1632 //load tracklet to the tracker and the track
1633/* Int_t index;
1634 if((index = FindTracklet(ptrTracklet)) < 0){
1635 ptrTracklet = SetTracklet(&tracklet);
1636 index = fTracklets->GetEntriesFast()-1;
1637 }
1638 track->SetTracklet(ptrTracklet, index);*/
1639
1640
1641 // register tracklet to track with tracklet creation !!
1642 // PropagateBack : loaded tracklet to the tracker and update index
1643 // RefitInward : update index
1644 // MakeTrack : loaded tracklet to the tracker and update index
1645 if(!tracklets) track->SetTracklet(ptrTracklet, -1);
1646
1647
1648 //Calculate the mean material budget along the path inside the chamber
1649 Double_t xyz0[3]; track->GetXYZ(xyz0);
1650 Double_t alpha = track->GetAlpha();
1651 Double_t xyz1[3], y, z;
1652 if(!track->GetProlongation(x, y, z)) return -1;
1653 xyz1[0] = x * TMath::Cos(alpha) - y * TMath::Sin(alpha);
1654 xyz1[1] = +x * TMath::Sin(alpha) + y * TMath::Cos(alpha);
1655 xyz1[2] = z;
3cfaffa4 1656 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 1657 Double_t param[7];
3cfaffa4 1658 if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param) <=0.) break;
1bf51039 1659 Double_t xrho = param[0]*param[4]; // density*length
1660 Double_t xx0 = param[1]; // radiation length
1661
1662 //Propagate the track
1663 track->PropagateTo(x, xx0, xrho);
1664 if (!AdjustSector(track)) break;
1665
1666 //Update track
b72f4eaf 1667 Double_t cov[3]; ptrTracklet->GetCovAt(x, cov);
1668 Double_t p[2] = { ptrTracklet->GetY(), ptrTracklet->GetZ()};
1669 Double_t chi2 = ((AliExternalTrackParam*)track)->GetPredictedChi2(p, cov);
1670 if(chi2<1e+10) track->Update(p, cov, chi2);
1bf51039 1671 if(!up) continue;
1672
1673 //Reset material budget if 2 consecutive gold
1674 if(iplane>0 && track->GetTracklet(iplane-1) && ptrTracklet->GetN() + track->GetTracklet(iplane-1)->GetN() > 20) track->SetBudget(2, 0.);
1675 } // end planes loop
1676
1677 // extrapolation
1678 while(ip < np){
1679 if(((up?-1:1) * (points[ip].GetX() - track->GetX()) < 0) && !PropagateToX(*track, points[ip].GetX(), fgkMaxStep)) return -1.;
1680
1681 Double_t xyz[3]; // should also get the covariance
3cfaffa4 1682 track->GetXYZ(xyz);
1683 track->Global2LocalPosition(xyz, track->GetAlpha());
1684 points[ip].SetXYZ(xyz[0], xyz[1], xyz[2]);
1bf51039 1685 ip++;
1686 }
1687
1688 return track->GetChi2();
1689}
3b57a3f7 1690
eb38ed55 1691//_________________________________________________________________________
bb56afff 1692Float_t AliTRDtrackerV1::CalculateChi2Z(AliTRDseedV1 *tracklets, Double_t offset, Double_t slope, Double_t xref)
eb38ed55 1693{
41702fec 1694 //
1695 // Calculates the chi2-value of the track in z-Direction including tilting pad correction.
1696 // A linear dependence on the x-value serves as a model.
1697 // The parameters are related to the tilted Riemann fit.
1698 // Parameters: - Array of tracklets (AliTRDseedV1) related to the track candidate
1699 // - the offset for the reference x
1700 // - the slope
1701 // - the reference x position
1702 // Output: - The Chi2 value of the track in z-Direction
1703 //
1704 Float_t chi2Z = 0, nLayers = 0;
053767a4 1705 for (Int_t iLayer = 0; iLayer < AliTRDgeometry::kNlayer; iLayer++) {
41702fec 1706 if(!tracklets[iLayer].IsOK()) continue;
1707 Double_t z = offset + slope * (tracklets[iLayer].GetX0() - xref);
e3cf3d02 1708 chi2Z += TMath::Abs(tracklets[iLayer].GetZfit(0) - z);
41702fec 1709 nLayers++;
1710 }
1711 chi2Z /= TMath::Max((nLayers - 3.0),1.0);
1712 return chi2Z;
eb38ed55 1713}
1714
bccda319 1715//_____________________________________________________________________________
1716Int_t AliTRDtrackerV1::PropagateToX(AliTRDtrackV1 &t, Double_t xToGo, Double_t maxStep)
1717{
41702fec 1718 //
1719 // Starting from current X-position of track <t> this function
1720 // extrapolates the track up to radial position <xToGo>.
1721 // Returns 1 if track reaches the plane, and 0 otherwise
1722 //
bccda319 1723
41702fec 1724 const Double_t kEpsilon = 0.00001;
bccda319 1725
41702fec 1726 // Current track X-position
1727 Double_t xpos = t.GetX();
bccda319 1728
41702fec 1729 // Direction: inward or outward
1730 Double_t dir = (xpos < xToGo) ? 1.0 : -1.0;
bccda319 1731
41702fec 1732 while (((xToGo - xpos) * dir) > kEpsilon) {
bccda319 1733
41702fec 1734 Double_t xyz0[3];
1735 Double_t xyz1[3];
1736 Double_t param[7];
1737 Double_t x;
1738 Double_t y;
1739 Double_t z;
bccda319 1740
41702fec 1741 // The next step size
1742 Double_t step = dir * TMath::Min(TMath::Abs(xToGo-xpos),maxStep);
bccda319 1743
41702fec 1744 // Get the global position of the starting point
1745 t.GetXYZ(xyz0);
bccda319 1746
41702fec 1747 // X-position after next step
1748 x = xpos + step;
bccda319 1749
41702fec 1750 // Get local Y and Z at the X-position of the next step
3352b455 1751 if(t.GetProlongation(x,y,z)<0) return 0; // No prolongation possible
bccda319 1752
41702fec 1753 // The global position of the end point of this prolongation step
1754 xyz1[0] = x * TMath::Cos(t.GetAlpha()) - y * TMath::Sin(t.GetAlpha());
1755 xyz1[1] = +x * TMath::Sin(t.GetAlpha()) + y * TMath::Cos(t.GetAlpha());
1756 xyz1[2] = z;
bccda319 1757
41702fec 1758 // Calculate the mean material budget between start and
1759 // end point of this prolongation step
83dea92e 1760 if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param)<=0.) return 0;
bccda319 1761
41702fec 1762 // Propagate the track to the X-position after the next step
9c87a076 1763 if (!t.PropagateTo(x, param[1], param[0]*param[4])) return 0;
bccda319 1764
41702fec 1765 // Rotate the track if necessary
1766 AdjustSector(&t);
bccda319 1767
41702fec 1768 // New track X-position
1769 xpos = t.GetX();
bccda319 1770
41702fec 1771 }
bccda319 1772
41702fec 1773 return 1;
bccda319 1774
1775}
1776
eb38ed55 1777
1778//_____________________________________________________________________________
1779Int_t AliTRDtrackerV1::ReadClusters(TClonesArray* &array, TTree *clusterTree) const
1780{
41702fec 1781 //
1782 // Reads AliTRDclusters from the file.
1783 // The names of the cluster tree and branches
1784 // should match the ones used in AliTRDclusterizer::WriteClusters()
1785 //
1786
1787 Int_t nsize = Int_t(clusterTree->GetTotBytes() / (sizeof(AliTRDcluster)));
1788 TObjArray *clusterArray = new TObjArray(nsize+1000);
1789
1790 TBranch *branch = clusterTree->GetBranch("TRDcluster");
1791 if (!branch) {
1792 AliError("Can't get the branch !");
1793 return 1;
1794 }
1795 branch->SetAddress(&clusterArray);
1796
1797 if(!fClusters){
4d6aee34 1798 Float_t nclusters = fkReconstructor->GetRecoParam()->GetNClusters();
1799 if(fkReconstructor->IsHLT()) nclusters /= AliTRDgeometry::kNsector;
8ae98148 1800 array = new TClonesArray("AliTRDcluster", Int_t(nclusters));
41702fec 1801 array->SetOwner(kTRUE);
1802 }
1803
1804 // Loop through all entries in the tree
1805 Int_t nEntries = (Int_t) clusterTree->GetEntries();
1806 Int_t nbytes = 0;
1807 Int_t ncl = 0;
4d6aee34 1808 AliTRDcluster *c = NULL;
41702fec 1809 for (Int_t iEntry = 0; iEntry < nEntries; iEntry++) {
1810 // Import the tree
1811 nbytes += clusterTree->GetEvent(iEntry);
1812
1813 // Get the number of points in the detector
1814 Int_t nCluster = clusterArray->GetEntriesFast();
1815 for (Int_t iCluster = 0; iCluster < nCluster; iCluster++) {
1816 if(!(c = (AliTRDcluster *) clusterArray->UncheckedAt(iCluster))) continue;
41702fec 1817 new((*fClusters)[ncl++]) AliTRDcluster(*c);
1818 delete (clusterArray->RemoveAt(iCluster));
1819 }
1820
1821 }
1822 delete clusterArray;
1823
1824 return 0;
eb38ed55 1825}
1826
1827//_____________________________________________________________________________
1828Int_t AliTRDtrackerV1::LoadClusters(TTree *cTree)
1829{
41702fec 1830 //
66f6bfd9 1831 // Fills clusters into TRD tracking sectors
41702fec 1832 //
41702fec 1833
4d6aee34 1834 if(!fkReconstructor->IsWritingClusters()){
48f8adf3 1835 fClusters = AliTRDReconstructor::GetClusters();
1836 } else {
66f6bfd9 1837 if (ReadClusters(fClusters, cTree)) {
1838 AliError("Problem with reading the clusters !");
1839 return 1;
1840 }
1841 }
1842 SetClustersOwner();
1843
48f8adf3 1844 if(!fClusters || !fClusters->GetEntriesFast()){
66f6bfd9 1845 AliInfo("No TRD clusters");
41702fec 1846 return 1;
1847 }
66f6bfd9 1848
1849 //Int_t nin =
1850 BuildTrackingContainers();
1851
1852 //Int_t ncl = fClusters->GetEntriesFast();
1853 //AliInfo(Form("Clusters %d [%6.2f %% in the active volume]", ncl, 100.*float(nin)/ncl));
1854
1855 return 0;
1856}
1857
1858//_____________________________________________________________________________
4d6aee34 1859Int_t AliTRDtrackerV1::LoadClusters(TClonesArray * const clusters)
66f6bfd9 1860{
1861 //
1862 // Fills clusters into TRD tracking sectors
1863 // Function for use in the HLT
1864
1865 if(!clusters || !clusters->GetEntriesFast()){
1866 AliInfo("No TRD clusters");
41702fec 1867 return 1;
1868 }
1869
66f6bfd9 1870 fClusters = clusters;
1871 SetClustersOwner();
1872
1873 //Int_t nin =
1874 BuildTrackingContainers();
1875
1876 //Int_t ncl = fClusters->GetEntriesFast();
1877 //AliInfo(Form("Clusters %d [%6.2f %% in the active volume]", ncl, 100.*float(nin)/ncl));
1878
1879 return 0;
1880}
1881
1882
1883//____________________________________________________________________
1884Int_t AliTRDtrackerV1::BuildTrackingContainers()
1885{
1886// Building tracking containers for clusters
1887
1888 Int_t nin =0, icl = fClusters->GetEntriesFast();
41702fec 1889 while (icl--) {
1890 AliTRDcluster *c = (AliTRDcluster *) fClusters->UncheckedAt(icl);
1891 if(c->IsInChamber()) nin++;
1892 Int_t detector = c->GetDetector();
1893 Int_t sector = fGeom->GetSector(detector);
053767a4 1894 Int_t stack = fGeom->GetStack(detector);
1895 Int_t layer = fGeom->GetLayer(detector);
41702fec 1896
053767a4 1897 fTrSec[sector].GetChamber(stack, layer, kTRUE)->InsertCluster(c, icl);
41702fec 1898 }
b0a48c4d 1899
1900 const AliTRDCalDet *cal = AliTRDcalibDB::Instance()->GetT0Det();
053767a4 1901 for(int isector =0; isector<AliTRDgeometry::kNsector; isector++){
41702fec 1902 if(!fTrSec[isector].GetNChambers()) continue;
4d6aee34 1903 fTrSec[isector].Init(fkReconstructor, cal);
41702fec 1904 }
66f6bfd9 1905
1906 return nin;
eb38ed55 1907}
1908
1909
66f6bfd9 1910
0906e73e 1911//____________________________________________________________________
172b6f82 1912void AliTRDtrackerV1::UnloadClusters()
0906e73e 1913{
d4cf71ca 1914//
1915// Clears the arrays of clusters and tracks. Resets sectors and timebins
1916// If option "force" is also set the containers are also deleted. This is useful
1917// in case of HLT
1918
1919 if(fTracks){
1920 fTracks->Delete();
4d6aee34 1921 if(HasRemoveContainers()){delete fTracks; fTracks = NULL;}
d4cf71ca 1922 }
1923 if(fTracklets){
1924 fTracklets->Delete();
4d6aee34 1925 if(HasRemoveContainers()){delete fTracklets; fTracklets = NULL;}
d4cf71ca 1926 }
48f8adf3 1927 if(fClusters){
1928 if(IsClustersOwner()) fClusters->Delete();
1929
1930 // save clusters array in the reconstructor for further use.
4d6aee34 1931 if(!fkReconstructor->IsWritingClusters()){
48f8adf3 1932 AliTRDReconstructor::SetClusters(fClusters);
1933 SetClustersOwner(kFALSE);
4d6aee34 1934 } else AliTRDReconstructor::SetClusters(NULL);
48f8adf3 1935 }
0906e73e 1936
053767a4 1937 for (int i = 0; i < AliTRDgeometry::kNsector; i++) fTrSec[i].Clear();
0906e73e 1938
41702fec 1939 // Increment the Event Number
1940 AliTRDtrackerDebug::SetEventNumber(AliTRDtrackerDebug::GetEventNumber() + 1);
eb38ed55 1941}
0906e73e 1942
fac58f00 1943// //____________________________________________________________________
1944// void AliTRDtrackerV1::UseClusters(const AliKalmanTrack *t, Int_t) const
1945// {
1946// const AliTRDtrackV1 *track = dynamic_cast<const AliTRDtrackV1*>(t);
1947// if(!track) return;
1948//
4d6aee34 1949// AliTRDseedV1 *tracklet = NULL;
fac58f00 1950// for(Int_t ily=AliTRDgeometry::kNlayer; ily--;){
1951// if(!(tracklet = track->GetTracklet(ily))) continue;
4d6aee34 1952// AliTRDcluster *c = NULL;
8d2bec9e 1953// for(Int_t ic=AliTRDseed::kNclusters; ic--;){
fac58f00 1954// if(!(c=tracklet->GetClusters(ic))) continue;
1955// c->Use();
1956// }
1957// }
1958// }
1959//
b1957d3c 1960
eb38ed55 1961//_____________________________________________________________________________
4d6aee34 1962Bool_t AliTRDtrackerV1::AdjustSector(AliTRDtrackV1 *const track)
eb38ed55 1963{
41702fec 1964 //
1965 // Rotates the track when necessary
1966 //
1967
1968 Double_t alpha = AliTRDgeometry::GetAlpha();
1969 Double_t y = track->GetY();
1970 Double_t ymax = track->GetX()*TMath::Tan(0.5*alpha);
3cfaffa4 1971
41702fec 1972 if (y > ymax) {
1973 if (!track->Rotate( alpha)) {
1974 return kFALSE;
1975 }
1976 }
1977 else if (y < -ymax) {
1978 if (!track->Rotate(-alpha)) {
1979 return kFALSE;
1980 }
1981 }
1982
1983 return kTRUE;
0906e73e 1984
1985}
1986
eb38ed55 1987
0906e73e 1988//____________________________________________________________________
4d6aee34 1989AliTRDseedV1* AliTRDtrackerV1::GetTracklet(AliTRDtrackV1 *const track, Int_t p, Int_t &idx)
0906e73e 1990{
41702fec 1991 // Find tracklet for TRD track <track>
1992 // Parameters
1993 // - track
1994 // - sector
1995 // - plane
1996 // - index
1997 // Output
1998 // tracklet
1999 // index
2000 // Detailed description
2001 //
2002 idx = track->GetTrackletIndex(p);
4d6aee34 2003 AliTRDseedV1 *tracklet = (idx==0xffff) ? NULL : (AliTRDseedV1*)fTracklets->UncheckedAt(idx);
41702fec 2004
2005 return tracklet;
0906e73e 2006}
2007
2008//____________________________________________________________________
4d6aee34 2009AliTRDseedV1* AliTRDtrackerV1::SetTracklet(const AliTRDseedV1 * const tracklet)
0906e73e 2010{
41702fec 2011 // Add this tracklet to the list of tracklets stored in the tracker
2012 //
2013 // Parameters
2014 // - tracklet : pointer to the tracklet to be added to the list
2015 //
2016 // Output
2017 // - the index of the new tracklet in the tracker tracklets list
2018 //
2019 // Detailed description
2020 // Build the tracklets list if it is not yet created (late initialization)
2021 // and adds the new tracklet to the list.
2022 //
2023 if(!fTracklets){
053767a4 2024 fTracklets = new TClonesArray("AliTRDseedV1", AliTRDgeometry::Nsector()*kMaxTracksStack);
41702fec 2025 fTracklets->SetOwner(kTRUE);
2026 }
2027 Int_t nentries = fTracklets->GetEntriesFast();
2028 return new ((*fTracklets)[nentries]) AliTRDseedV1(*tracklet);
972ef65e 2029}
2030
d20df6fc 2031//____________________________________________________________________
4d6aee34 2032AliTRDtrackV1* AliTRDtrackerV1::SetTrack(const AliTRDtrackV1 * const track)
d20df6fc 2033{
2034 // Add this track to the list of tracks stored in the tracker
2035 //
2036 // Parameters
2037 // - track : pointer to the track to be added to the list
2038 //
2039 // Output
2040 // - the pointer added
2041 //
2042 // Detailed description
2043 // Build the tracks list if it is not yet created (late initialization)
2044 // and adds the new track to the list.
2045 //
2046 if(!fTracks){
053767a4 2047 fTracks = new TClonesArray("AliTRDtrackV1", AliTRDgeometry::Nsector()*kMaxTracksStack);
d20df6fc 2048 fTracks->SetOwner(kTRUE);
2049 }
2050 Int_t nentries = fTracks->GetEntriesFast();
2051 return new ((*fTracks)[nentries]) AliTRDtrackV1(*track);
2052}
2053
2054
0906e73e 2055
e4f2f73d 2056//____________________________________________________________________
eb38ed55 2057Int_t AliTRDtrackerV1::Clusters2TracksSM(Int_t sector, AliESDEvent *esd)
e4f2f73d 2058{
41702fec 2059 //
2060 // Steer tracking for one SM.
2061 //
2062 // Parameters :
2063 // sector : Array of (SM) propagation layers containing clusters
2064 // esd : The current ESD event. On output it contains the also
2065 // the ESD (TRD) tracks found in this SM.
2066 //
2067 // Output :
2068 // Number of tracks found in this TRD supermodule.
2069 //
2070 // Detailed description
2071 //
2072 // 1. Unpack AliTRDpropagationLayers objects for each stack.
2073 // 2. Launch stack tracking.
2074 // See AliTRDtrackerV1::Clusters2TracksStack() for details.
2075 // 3. Pack results in the ESD event.
2076 //
2077
2078 // allocate space for esd tracks in this SM
2079 TClonesArray esdTrackList("AliESDtrack", 2*kMaxTracksStack);
2080 esdTrackList.SetOwner();
2081
2082 Int_t nTracks = 0;
2083 Int_t nChambers = 0;
4d6aee34 2084 AliTRDtrackingChamber **stack = NULL, *chamber = NULL;
053767a4 2085 for(int istack = 0; istack<AliTRDgeometry::kNstack; istack++){
41702fec 2086 if(!(stack = fTrSec[sector].GetStack(istack))) continue;
2087 nChambers = 0;
053767a4 2088 for(int ilayer=0; ilayer<AliTRDgeometry::kNlayer; ilayer++){
2089 if(!(chamber = stack[ilayer])) continue;
4d6aee34 2090 if(chamber->GetNClusters() < fgNTimeBins * fkReconstructor->GetRecoParam() ->GetFindableClusters()) continue;
41702fec 2091 nChambers++;
053767a4 2092 //AliInfo(Form("sector %d stack %d layer %d clusters %d", sector, istack, ilayer, chamber->GetNClusters()));
41702fec 2093 }
2094 if(nChambers < 4) continue;
2095 //AliInfo(Form("Doing stack %d", istack));
2096 nTracks += Clusters2TracksStack(stack, &esdTrackList);
2097 }
2098 //AliInfo(Form("Found %d tracks in SM %d [%d]\n", nTracks, sector, esd->GetNumberOfTracks()));
2099
2100 for(int itrack=0; itrack<nTracks; itrack++)
2101 esd->AddTrack((AliESDtrack*)esdTrackList[itrack]);
2102
2103 // Reset Track and Candidate Number
2104 AliTRDtrackerDebug::SetCandidateNumber(0);
2105 AliTRDtrackerDebug::SetTrackNumber(0);
2106 return nTracks;
e4f2f73d 2107}
2108
2109//____________________________________________________________________
4d6aee34 2110Int_t AliTRDtrackerV1::Clusters2TracksStack(AliTRDtrackingChamber **stack, TClonesArray * const esdTrackList)
e4f2f73d 2111{
41702fec 2112 //
2113 // Make tracks in one TRD stack.
2114 //
2115 // Parameters :
2116 // layer : Array of stack propagation layers containing clusters
2117 // esdTrackList : Array of ESD tracks found by the stand alone tracker.
2118 // On exit the tracks found in this stack are appended.
2119 //
2120 // Output :
2121 // Number of tracks found in this stack.
2122 //
2123 // Detailed description
2124 //
2125 // 1. Find the 3 most useful seeding chambers. See BuildSeedingConfigs() for details.
2126 // 2. Steer AliTRDtrackerV1::MakeSeeds() for 3 seeding layer configurations.
2127 // See AliTRDtrackerV1::MakeSeeds() for more details.
2128 // 3. Arrange track candidates in decreasing order of their quality
2129 // 4. Classify tracks in 5 categories according to:
2130 // a) number of layers crossed
2131 // b) track quality
2132 // 5. Sign clusters by tracks in decreasing order of track quality
2133 // 6. Build AliTRDtrack out of seeding tracklets
2134 // 7. Cook MC label
2135 // 8. Build ESD track and register it to the output list
2136 //
2137
b0a48c4d 2138 const AliTRDCalDet *cal = AliTRDcalibDB::Instance()->GetT0Det();
4d6aee34 2139 AliTRDtrackingChamber *chamber = NULL;
2140 AliTRDtrackingChamber **ci = NULL;
41702fec 2141 AliTRDseedV1 sseed[kMaxTracksStack*6]; // to be initialized
2142 Int_t pars[4]; // MakeSeeds parameters
2143
2144 //Double_t alpha = AliTRDgeometry::GetAlpha();
2145 //Double_t shift = .5 * alpha;
2146 Int_t configs[kNConfigs];
2147
fac58f00 2148 // Purge used clusters from the containers
2149 ci = &stack[0];
2150 for(Int_t ic = kNPlanes; ic--; ci++){
2151 if(!(*ci)) continue;
2152 (*ci)->Update();
2153 }
2154
41702fec 2155 // Build initial seeding configurations
2156 Double_t quality = BuildSeedingConfigs(stack, configs);
a2fbb6ec 2157 if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) > 10){
41702fec 2158 AliInfo(Form("Plane config %d %d %d Quality %f"
2159 , configs[0], configs[1], configs[2], quality));
2160 }
d931f2aa 2161
41702fec 2162
2163 // Initialize contors
2164 Int_t ntracks, // number of TRD track candidates
2165 ntracks1, // number of registered TRD tracks/iter
2166 ntracks2 = 0; // number of all registered TRD tracks in stack
2167 fSieveSeeding = 0;
d931f2aa 2168
2169 // Get stack index
fac58f00 2170 Int_t ic = 0; ci = &stack[0];
2171 while(ic<kNPlanes && !(*ci)){ic++; ci++;}
2172 if(!(*ci)) return ntracks2;
2173 Int_t istack = fGeom->GetStack((*ci)->GetDetector());
d931f2aa 2174
41702fec 2175 do{
2176 // Loop over seeding configurations
2177 ntracks = 0; ntracks1 = 0;
2178 for (Int_t iconf = 0; iconf<3; iconf++) {
2179 pars[0] = configs[iconf];
2180 pars[1] = ntracks;
d931f2aa 2181 pars[2] = istack;
41702fec 2182 ntracks = MakeSeeds(stack, &sseed[6*ntracks], pars);
6e39bde4 2183 //AliInfo(Form("Number of Tracks after iteration step %d: %d\n", iconf, ntracks));
41702fec 2184 if(ntracks == kMaxTracksStack) break;
2185 }
a2fbb6ec 2186 if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) > 1) AliInfo(Form("Candidate TRD tracks %d in iteration %d.", ntracks, fSieveSeeding));
41702fec 2187
2188 if(!ntracks) break;
2189
2190 // Sort the seeds according to their quality
2191 Int_t sort[kMaxTracksStack];
2192 TMath::Sort(ntracks, fTrackQuality, sort, kTRUE);
2193
2194 // Initialize number of tracks so far and logic switches
2195 Int_t ntracks0 = esdTrackList->GetEntriesFast();
2196 Bool_t signedTrack[kMaxTracksStack];
2197 Bool_t fakeTrack[kMaxTracksStack];
2198 for (Int_t i=0; i<ntracks; i++){
2199 signedTrack[i] = kFALSE;
2200 fakeTrack[i] = kFALSE;
2201 }
2202 //AliInfo("Selecting track candidates ...");
2203
2204 // Sieve clusters in decreasing order of track quality
2205 Double_t trackParams[7];
4d6aee34 2206 // AliTRDseedV1 *lseed = NULL;
41702fec 2207 Int_t jSieve = 0, candidates;
2208 do{
2209 //AliInfo(Form("\t\tITER = %i ", jSieve));
2210
2211 // Check track candidates
2212 candidates = 0;
2213 for (Int_t itrack = 0; itrack < ntracks; itrack++) {
804bb02e 2214 Int_t trackIndex = sort[itrack];
2215 if (signedTrack[trackIndex] || fakeTrack[trackIndex]) continue;
41702fec 2216
2217
804bb02e 2218 // Calculate track parameters from tracklets seeds
804bb02e 2219 Int_t ncl = 0;
2220 Int_t nused = 0;
2221 Int_t nlayers = 0;
2222 Int_t findable = 0;
2223 for (Int_t jLayer = 0; jLayer < kNPlanes; jLayer++) {
2224 Int_t jseed = kNPlanes*trackIndex+jLayer;
2225 if(!sseed[jseed].IsOK()) continue;
f29f13a6 2226 if (TMath::Abs(sseed[jseed].GetYref(0) / sseed[jseed].GetX0()) < 0.158) findable++;
eede7907 2227 // TODO here we get a sig fault which should never happen !
804bb02e 2228 sseed[jseed].UpdateUsed();
2229 ncl += sseed[jseed].GetN2();
2230 nused += sseed[jseed].GetNUsed();
2231 nlayers++;
804bb02e 2232 }
2233
f29f13a6 2234 // Filter duplicated tracks
2235 if (nused > 30){
2236 //printf("Skip %d nused %d\n", trackIndex, nused);
2237 fakeTrack[trackIndex] = kTRUE;
2238 continue;
2239 }
2240 if (Float_t(nused)/ncl >= .25){
2241 //printf("Skip %d nused/ncl >= .25\n", trackIndex);
2242 fakeTrack[trackIndex] = kTRUE;
2243 continue;
2244 }
41702fec 2245
f29f13a6 2246 // Classify tracks
2247 Bool_t skip = kFALSE;
2248 switch(jSieve){
2249 case 0:
2250 if(nlayers < 6) {skip = kTRUE; break;}
2251 if(TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -5.){skip = kTRUE; break;}
2252 break;
2253
2254 case 1:
2255 if(nlayers < findable){skip = kTRUE; break;}
2256 if(TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -4.){skip = kTRUE; break;}
2257 break;
2258
2259 case 2:
2260 if ((nlayers == findable) || (nlayers == 6)) { skip = kTRUE; break;}
2261 if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -6.0){skip = kTRUE; break;}
2262 break;
2263
2264 case 3:
2265 if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -5.){skip = kTRUE; break;}
2266 break;
2267
2268 case 4:
2269 if (nlayers == 3){skip = kTRUE; break;}
2270 //if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) - nused/(nlayers-3.0) < -15.0){skip = kTRUE; break;}
2271 break;
2272 }
2273 if(skip){
2274 candidates++;
2275 //printf("REJECTED : %d [%d] nlayers %d trackQuality = %e nused %d\n", itrack, trackIndex, nlayers, fTrackQuality[trackIndex], nused);
2276 continue;
2277 }
2278 signedTrack[trackIndex] = kTRUE;
2279
2280 // Build track parameters
2281 AliTRDseedV1 *lseed =&sseed[trackIndex*6];
2282 /* Int_t idx = 0;
2283 while(idx<3 && !lseed->IsOK()) {
2284 idx++;
2285 lseed++;
2286 }*/
2287 Double_t x = lseed->GetX0();// - 3.5;
2288 trackParams[0] = x; //NEW AB
2289 trackParams[1] = lseed->GetYref(0); // lseed->GetYat(x);
2290 trackParams[2] = lseed->GetZref(0); // lseed->GetZat(x);
2291 trackParams[3] = TMath::Sin(TMath::ATan(lseed->GetYref(1)));
2292 trackParams[4] = lseed->GetZref(1) / TMath::Sqrt(1. + lseed->GetYref(1) * lseed->GetYref(1));
2293 trackParams[5] = lseed->GetC();
2294 Int_t ich = 0; while(!(chamber = stack[ich])) ich++;
2295 trackParams[6] = fGeom->GetSector(chamber->GetDetector());/* *alpha+shift; // Supermodule*/
2296
a2fbb6ec 2297 if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) > 1 && fkReconstructor->IsDebugStreaming()){
eb2b4f91 2298 //AliInfo(Form("Track %d [%d] nlayers %d trackQuality = %e nused %d, yref = %3.3f", itrack, trackIndex, nlayers, fTrackQuality[trackIndex], nused, trackParams[1]));
f29f13a6 2299
f29f13a6 2300 AliTRDseedV1 *dseed[6];
b82b4de1 2301 for(Int_t iseed = AliTRDgeometry::kNlayer; iseed--;) dseed[iseed] = new AliTRDseedV1(lseed[iseed]);
f29f13a6 2302
2303 //Int_t eventNrInFile = esd->GetEventNumberInFile();
f29f13a6 2304 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2305 Int_t trackNumber = AliTRDtrackerDebug::GetTrackNumber();
2306 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
a2fbb6ec 2307 TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
f29f13a6 2308 cstreamer << "Clusters2TracksStack"
2309 << "EventNumber=" << eventNumber
2310 << "TrackNumber=" << trackNumber
2311 << "CandidateNumber=" << candidateNumber
2312 << "Iter=" << fSieveSeeding
2313 << "Like=" << fTrackQuality[trackIndex]
2314 << "S0.=" << dseed[0]
2315 << "S1.=" << dseed[1]
2316 << "S2.=" << dseed[2]
2317 << "S3.=" << dseed[3]
2318 << "S4.=" << dseed[4]
2319 << "S5.=" << dseed[5]
2320 << "p0=" << trackParams[0]
2321 << "p1=" << trackParams[1]
2322 << "p2=" << trackParams[2]
2323 << "p3=" << trackParams[3]
2324 << "p4=" << trackParams[4]
2325 << "p5=" << trackParams[5]
2326 << "p6=" << trackParams[6]
f29f13a6 2327 << "Ncl=" << ncl
2328 << "NLayers=" << nlayers
2329 << "Findable=" << findable
2330 << "NUsed=" << nused
2331 << "\n";
2332 }
d877f55f 2333
f29f13a6 2334 AliTRDtrackV1 *track = MakeTrack(&sseed[trackIndex*kNPlanes], trackParams);
2335 if(!track){
2336 AliWarning("Fail to build a TRD Track.");
2337 continue;
d877f55f 2338 }
41702fec 2339
f29f13a6 2340 //AliInfo("End of MakeTrack()");
2341 AliESDtrack *esdTrack = new ((*esdTrackList)[ntracks0++]) AliESDtrack();
2342 esdTrack->UpdateTrackParams(track, AliESDtrack::kTRDout);
2343 esdTrack->SetLabel(track->GetLabel());
2344 track->UpdateESDtrack(esdTrack);
2345 // write ESD-friends if neccessary
a2fbb6ec 2346 if (fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) > 0){
f29f13a6 2347 AliTRDtrackV1 *calibTrack = new AliTRDtrackV1(*track);
2348 calibTrack->SetOwner();
2349 esdTrack->AddCalibObject(calibTrack);
2350 }
2351 ntracks1++;
2352 AliTRDtrackerDebug::SetTrackNumber(AliTRDtrackerDebug::GetTrackNumber() + 1);
41702fec 2353 }
2354
2355 jSieve++;
2356 } while(jSieve<5 && candidates); // end track candidates sieve
2357 if(!ntracks1) break;
2358
2359 // increment counters
2360 ntracks2 += ntracks1;
4302c900 2361
4d6aee34 2362 if(fkReconstructor->IsHLT()) break;
41702fec 2363 fSieveSeeding++;
2364
2365 // Rebuild plane configurations and indices taking only unused clusters into account
2366 quality = BuildSeedingConfigs(stack, configs);
4d6aee34 2367 if(quality < 1.E-7) break; //fkReconstructor->GetRecoParam() ->GetPlaneQualityThreshold()) break;
41702fec 2368
2369 for(Int_t ip = 0; ip < kNPlanes; ip++){
2370 if(!(chamber = stack[ip])) continue;
b0a48c4d 2371 chamber->Build(fGeom, cal);//Indices(fSieveSeeding);
41702fec 2372 }
2373
a2fbb6ec 2374 if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) > 10){
41702fec 2375 AliInfo(Form("Sieve level %d Plane config %d %d %d Quality %f", fSieveSeeding, configs[0], configs[1], configs[2], quality));
2376 }
2377 } while(fSieveSeeding<10); // end stack clusters sieve
2378
2379
2380
2381 //AliInfo(Form("Registered TRD tracks %d in stack %d.", ntracks2, pars[1]));
2382
2383 return ntracks2;
e4f2f73d 2384}
2385
2386//___________________________________________________________________
eb38ed55 2387Double_t AliTRDtrackerV1::BuildSeedingConfigs(AliTRDtrackingChamber **stack, Int_t *configs)
e4f2f73d 2388{
41702fec 2389 //
2390 // Assign probabilities to chambers according to their
2391 // capability of producing seeds.
2392 //
2393 // Parameters :
2394 //
2395 // layers : Array of stack propagation layers for all 6 chambers in one stack
2396 // configs : On exit array of configuration indexes (see GetSeedingConfig()
2397 // for details) in the decreasing order of their seeding probabilities.
2398 //
2399 // Output :
2400 //
2401 // Return top configuration quality
2402 //
2403 // Detailed description:
2404 //
2405 // To each chamber seeding configuration (see GetSeedingConfig() for
2406 // the list of all configurations) one defines 2 quality factors:
2407 // - an apriori topological quality (see GetSeedingConfig() for details) and
2408 // - a data quality based on the uniformity of the distribution of
2409 // clusters over the x range (time bins population). See CookChamberQA() for details.
2410 // The overall chamber quality is given by the product of this 2 contributions.
2411 //
2412
eb2b4f91 2413 Double_t chamberQ[kNPlanes];memset(chamberQ, 0, kNPlanes*sizeof(Double_t));
4d6aee34 2414 AliTRDtrackingChamber *chamber = NULL;
41702fec 2415 for(int iplane=0; iplane<kNPlanes; iplane++){
2416 if(!(chamber = stack[iplane])) continue;
2417 chamberQ[iplane] = (chamber = stack[iplane]) ? chamber->GetQuality() : 0.;
2418 }
2419
eb2b4f91 2420 Double_t tconfig[kNConfigs];memset(tconfig, 0, kNConfigs*sizeof(Double_t));
2421 Int_t planes[] = {0, 0, 0, 0};
41702fec 2422 for(int iconf=0; iconf<kNConfigs; iconf++){
2423 GetSeedingConfig(iconf, planes);
2424 tconfig[iconf] = fgTopologicQA[iconf];
2425 for(int iplane=0; iplane<4; iplane++) tconfig[iconf] *= chamberQ[planes[iplane]];
2426 }
2427
2428 TMath::Sort((Int_t)kNConfigs, tconfig, configs, kTRUE);
2429 // AliInfo(Form("q[%d] = %f", configs[0], tconfig[configs[0]]));
2430 // AliInfo(Form("q[%d] = %f", configs[1], tconfig[configs[1]]));
2431 // AliInfo(Form("q[%d] = %f", configs[2], tconfig[configs[2]]));
2432
2433 return tconfig[configs[0]];
e4f2f73d 2434}
2435
2436//____________________________________________________________________
e17f4785 2437Int_t AliTRDtrackerV1::MakeSeeds(AliTRDtrackingChamber **stack, AliTRDseedV1 * const sseed, const Int_t * const ipar)
e4f2f73d 2438{
afa21247 2439//
2a3191bb 2440// Seed tracklets and build candidate TRD tracks. The procedure is used during barrel tracking to account for tracks which are
2441// either missed by TPC prolongation or conversions inside the TRD volume.
2442// For stand alone tracking the procedure is used to estimate all tracks measured by TRD.
afa21247 2443//
2444// Parameters :
2445// layers : Array of stack propagation layers containing clusters
2446// sseed : Array of empty tracklet seeds. On exit they are filled.
2447// ipar : Control parameters:
2448// ipar[0] -> seeding chambers configuration
2449// ipar[1] -> stack index
2450// ipar[2] -> number of track candidates found so far
2451//
2452// Output :
2453// Number of tracks candidates found.
2454//
2455// The following steps are performed:
2456// 1. Build seeding layers by collapsing all time bins from each of the four seeding chambers along the
2457// radial coordinate. See AliTRDtrackingChamber::GetSeedingLayer() for details. The chambers selection for seeding
2458// is described in AliTRDtrackerV1::Clusters2TracksStack().
2459// 2. Using the seeding clusters from the seeding layer (step 1) build combinatorics using the following algorithm:
2460// - for each seeding cluster in the lower seeding layer find
2461// - all seeding clusters in the upper seeding layer inside a road defined by a given phi angle. The angle
2462// is calculated on the minimum pt of tracks from vertex accesible to the stand alone tracker.
2463// - for each pair of two extreme seeding clusters select middle upper cluster using roads defined externally by the
2464// reco params
2465// - select last seeding cluster as the nearest to the linear approximation of the track described by the first three
2466// seeding clusters.
2467// The implementation of road calculation and cluster selection can be found in the functions AliTRDchamberTimeBin::BuildCond()
2468// and AliTRDchamberTimeBin::GetClusters().
2469// 3. Helix fit of the seeding clusters set. (see AliTRDtrackerFitter::FitRieman(AliTRDcluster**)). No tilt correction is
2470// performed at this level
2471// 4. Initialize seeding tracklets in the seeding chambers.
2472// 5. *Filter 0* Chi2 cut on the Y and Z directions. The threshold is set externally by the reco params.
2473// 6. Attach (true) clusters to seeding tracklets (see AliTRDseedV1::AttachClusters()) and fit tracklet (see
2474// AliTRDseedV1::Fit()). The number of used clusters used by current seeds should not exceed ... (25).
2475// 7. *Filter 1* Check if all 4 seeding tracklets are correctly constructed.
2476// 8. Helix fit of the clusters from the seeding tracklets with tilt correction. Refit tracklets using the new
2477// approximation of the track.
2478// 9. *Filter 2* Calculate likelihood of the track. (See AliTRDtrackerV1::CookLikelihood()). The following quantities are
2479// checked against the Riemann fit:
2480// - position resolution in y
2481// - angular resolution in the bending plane
2482// - likelihood of the number of clusters attached to the tracklet
2483// 10. Extrapolation of the helix fit to the other 2 chambers *non seeding* chambers:
2484// - Initialization of extrapolation tracklets with the fit parameters
2485// - Attach clusters to extrapolated tracklets
2486// - Helix fit of tracklets
2487// 11. Improve seeding tracklets quality by reassigning clusters based on the last parameters of the track
2488// See AliTRDtrackerV1::ImproveSeedQuality() for details.
2489// 12. Helix fit of all 6 seeding tracklets and chi2 calculation
2490// 13. Hyperplane fit and track quality calculation. See AliTRDtrackerFitter::FitHyperplane() for details.
2491// 14. Cooking labels for tracklets. Should be done only for MC
2492// 15. Register seeds.
2493//
2494// Authors:
2495// Marian Ivanov <M.Ivanov@gsi.de>
2496// Alexandru Bercuci <A.Bercuci@gsi.de>
2497// Markus Fasel <M.Fasel@gsi.de>
41702fec 2498
4d6aee34 2499 AliTRDtrackingChamber *chamber = NULL;
2500 AliTRDcluster *c[kNSeedPlanes] = {NULL, NULL, NULL, NULL}; // initilize seeding clusters
e17f4785 2501 AliTRDseedV1 *cseed = &sseed[0]; // initialize tracklets for first track
41702fec 2502 Int_t ncl, mcl; // working variable for looping over clusters
2503 Int_t index[AliTRDchamberTimeBin::kMaxClustersLayer], jndex[AliTRDchamberTimeBin::kMaxClustersLayer];
2504 // chi2 storage
2505 // chi2[0] = tracklet chi2 on the Z direction
2506 // chi2[1] = tracklet chi2 on the R direction
2507 Double_t chi2[4];
2508
afa21247 2509 // this should be data member of AliTRDtrack TODO
41702fec 2510 Double_t seedQuality[kMaxTracksStack];
2511
2512 // unpack control parameters
2513 Int_t config = ipar[0];
2514 Int_t ntracks = ipar[1];
d931f2aa 2515 Int_t istack = ipar[2];
41702fec 2516 Int_t planes[kNSeedPlanes]; GetSeedingConfig(config, planes);
afa21247 2517 Int_t planesExt[kNPlanes-kNSeedPlanes]; GetExtrapolationConfig(config, planesExt);
be24510a 2518
2519
41702fec 2520 // Init chambers geometry
41702fec 2521 Double_t hL[kNPlanes]; // Tilting angle
2522 Float_t padlength[kNPlanes]; // pad lenghts
dd8059a8 2523 Float_t padwidth[kNPlanes]; // pad widths
4d6aee34 2524 AliTRDpadPlane *pp = NULL;
41702fec 2525 for(int iplane=0; iplane<kNPlanes; iplane++){
2526 pp = fGeom->GetPadPlane(iplane, istack);
bb79ccd5 2527 hL[iplane] = TMath::Tan(TMath::DegToRad()*pp->GetTiltingAngle());
41702fec 2528 padlength[iplane] = pp->GetLengthIPad();
dd8059a8 2529 padwidth[iplane] = pp->GetWidthIPad();
41702fec 2530 }
2531
eb2b4f91 2532 // Init anode wire position for chambers
e165b64b 2533 Double_t x0[kNPlanes], // anode wire position
eb2b4f91 2534 driftLength = .5*AliTRDgeometry::AmThick() - AliTRDgeometry::DrThick(); // drift length
4d6aee34 2535 TGeoHMatrix *matrix = NULL;
eb2b4f91 2536 Double_t loc[] = {AliTRDgeometry::AnodePos(), 0., 0.};
2537 Double_t glb[] = {0., 0., 0.};
2538 AliTRDtrackingChamber **cIter = &stack[0];
a3743898 2539 for(int iLayer=0; iLayer<kNPlanes; iLayer++,cIter++){
eb2b4f91 2540 if(!(*cIter)) continue;
e165b64b 2541 if(!(matrix = fGeom->GetClusterMatrix((*cIter)->GetDetector()))){
2542 continue;
2543 x0[iLayer] = fgkX0[iLayer];
2544 }
eb2b4f91 2545 matrix->LocalToMaster(loc, glb);
2546 x0[iLayer] = glb[0];
2547 }
2548
a2fbb6ec 2549 if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) > 2){
41702fec 2550 AliInfo(Form("Making seeds Stack[%d] Config[%d] Tracks[%d]...", istack, config, ntracks));
2551 }
2552
d931f2aa 2553 // Build seeding layers
d611c74f 2554 ResetSeedTB();
41702fec 2555 Int_t nlayers = 0;
41702fec 2556 for(int isl=0; isl<kNSeedPlanes; isl++){
2557 if(!(chamber = stack[planes[isl]])) continue;
4d6aee34 2558 if(!chamber->GetSeedingLayer(fSeedTB[isl], fGeom, fkReconstructor)) continue;
41702fec 2559 nlayers++;
41702fec 2560 }
eb2b4f91 2561 if(nlayers < kNSeedPlanes) return ntracks;
41702fec 2562
2563
2564 // Start finding seeds
2565 Double_t cond0[4], cond1[4], cond2[4];
2566 Int_t icl = 0;
d611c74f 2567 while((c[3] = (*fSeedTB[3])[icl++])){
41702fec 2568 if(!c[3]) continue;
d611c74f 2569 fSeedTB[0]->BuildCond(c[3], cond0, 0);
2570 fSeedTB[0]->GetClusters(cond0, index, ncl);
41702fec 2571 //printf("Found c[3] candidates 0 %d\n", ncl);
2572 Int_t jcl = 0;
2573 while(jcl<ncl) {
d611c74f 2574 c[0] = (*fSeedTB[0])[index[jcl++]];
41702fec 2575 if(!c[0]) continue;
2576 Double_t dx = c[3]->GetX() - c[0]->GetX();
afa21247 2577 Double_t dzdx = (c[3]->GetZ() - c[0]->GetZ())/dx;
2578 Double_t dydx = (c[3]->GetY() - c[0]->GetY())/dx;
2579 fSeedTB[1]->BuildCond(c[0], cond1, 1, dzdx, dydx);
d611c74f 2580 fSeedTB[1]->GetClusters(cond1, jndex, mcl);
41702fec 2581 //printf("Found c[0] candidates 1 %d\n", mcl);
2582
2583 Int_t kcl = 0;
2584 while(kcl<mcl) {
d611c74f 2585 c[1] = (*fSeedTB[1])[jndex[kcl++]];
2586 if(!c[1]) continue;
afa21247 2587 fSeedTB[2]->BuildCond(c[1], cond2, 2, dzdx, dydx);
d611c74f 2588 c[2] = fSeedTB[2]->GetNearestCluster(cond2);
2589 //printf("Found c[1] candidate 2 %p\n", c[2]);
2590 if(!c[2]) continue;
2591
6e39bde4 2592 //AliInfo("Seeding clusters found. Building seeds ...");
2593 //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 2594
804bb02e 2595 for (Int_t il = 0; il < kNPlanes; il++) cseed[il].Reset();
41702fec 2596
d611c74f 2597 FitRieman(c, chi2);
2598
d931f2aa 2599 AliTRDseedV1 *tseed = &cseed[0];
bb2db46c 2600 cIter = &stack[0];
2601 for(int iLayer=0; iLayer<kNPlanes; iLayer++, tseed++, cIter++){
2602 Int_t det = (*cIter) ? (*cIter)->GetDetector() : -1;
eb2b4f91 2603 tseed->SetDetector(det);
43d6ad34 2604 tseed->SetTilt(hL[iLayer]);
2605 tseed->SetPadLength(padlength[iLayer]);
dd8059a8 2606 tseed->SetPadWidth(padwidth[iLayer]);
4d6aee34 2607 tseed->SetReconstructor(fkReconstructor);
eb2b4f91 2608 tseed->SetX0(det<0 ? fR[iLayer]+driftLength : x0[iLayer]);
d611c74f 2609 tseed->Init(GetRiemanFitter());
f29f13a6 2610 tseed->SetStandAlone(kTRUE);
d611c74f 2611 }
2612
2613 Bool_t isFake = kFALSE;
a2fbb6ec 2614 if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) >= 2 && fkReconstructor->IsDebugStreaming()){
d611c74f 2615 if (c[0]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
2616 if (c[1]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
2617 if (c[2]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
2618
2619 Double_t xpos[4];
2620 for(Int_t l = 0; l < kNSeedPlanes; l++) xpos[l] = fSeedTB[l]->GetX();
2621 Float_t yref[4];
2622 for(int il=0; il<4; il++) yref[il] = cseed[planes[il]].GetYref(0);
2623 Int_t ll = c[3]->GetLabel(0);
2624 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2625 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2626 AliRieman *rim = GetRiemanFitter();
a2fbb6ec 2627 TTreeSRedirector &cs0 = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
d611c74f 2628 cs0 << "MakeSeeds0"
2629 <<"EventNumber=" << eventNumber
2630 <<"CandidateNumber=" << candidateNumber
2631 <<"isFake=" << isFake
2632 <<"config=" << config
2633 <<"label=" << ll
2634 <<"chi2z=" << chi2[0]
2635 <<"chi2y=" << chi2[1]
2636 <<"Y2exp=" << cond2[0]
2637 <<"Z2exp=" << cond2[1]
2638 <<"X0=" << xpos[0] //layer[sLayer]->GetX()
2639 <<"X1=" << xpos[1] //layer[sLayer + 1]->GetX()
2640 <<"X2=" << xpos[2] //layer[sLayer + 2]->GetX()
2641 <<"X3=" << xpos[3] //layer[sLayer + 3]->GetX()
2642 <<"yref0=" << yref[0]
2643 <<"yref1=" << yref[1]
2644 <<"yref2=" << yref[2]
2645 <<"yref3=" << yref[3]
2646 <<"c0.=" << c[0]
2647 <<"c1.=" << c[1]
2648 <<"c2.=" << c[2]
2649 <<"c3.=" << c[3]
2650 <<"Seed0.=" << &cseed[planes[0]]
2651 <<"Seed1.=" << &cseed[planes[1]]
2652 <<"Seed2.=" << &cseed[planes[2]]
2653 <<"Seed3.=" << &cseed[planes[3]]
2654 <<"RiemanFitter.=" << rim
2655 <<"\n";
2656 }
4d6aee34 2657 if(chi2[0] > fkReconstructor->GetRecoParam() ->GetChi2Z()/*7./(3. - sLayer)*//*iter*/){
6e39bde4 2658 //AliInfo(Form("Failed chi2 filter on chi2Z [%f].", chi2[0]));
d611c74f 2659 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2660 continue;
2661 }
4d6aee34 2662 if(chi2[1] > fkReconstructor->GetRecoParam() ->GetChi2Y()/*1./(3. - sLayer)*//*iter*/){
6e39bde4 2663 //AliInfo(Form("Failed chi2 filter on chi2Y [%f].", chi2[1]));
d611c74f 2664 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2665 continue;
2666 }
2667 //AliInfo("Passed chi2 filter.");
2668
2669 // try attaching clusters to tracklets
6e39bde4 2670 Int_t mlayers = 0;
cfa15645 2671 AliTRDcluster *cl = NULL;
be24510a 2672 for(int iLayer=0; iLayer<kNSeedPlanes; iLayer++){
d611c74f 2673 Int_t jLayer = planes[iLayer];
cfa15645 2674 Int_t nNotInChamber = 0;
f29f13a6 2675 if(!cseed[jLayer].AttachClusters(stack[jLayer], kTRUE)) continue;
5f1ae1e7 2676 if(/*fkReconstructor->IsHLT()*/kFALSE){
692decf4 2677 cseed[jLayer].UpdateUsed();
cfa15645 2678 if(!cseed[jLayer].IsOK()) continue;
2679 }else{
2680 cseed[jLayer].Fit();
2681 cseed[jLayer].UpdateUsed();
2682 cseed[jLayer].ResetClusterIter();
2683 while((cl = cseed[jLayer].NextCluster())){
2684 if(!cl->IsInChamber()) nNotInChamber++;
2685 }
2686 //printf("clusters[%d], used[%d], not in chamber[%d]\n", cseed[jLayer].GetN(), cseed[jLayer].GetNUsed(), nNotInChamber);
2687 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
2688 }
d611c74f 2689 mlayers++;
2690 }
be24510a 2691
2692 if(mlayers < kNSeedPlanes){
2693 //AliInfo(Form("Failed updating all seeds %d [%d].", mlayers, kNSeedPlanes));
2694 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2695 continue;
2696 }
2697
2698 // temporary exit door for the HLT
4d6aee34 2699 if(fkReconstructor->IsHLT()){
be24510a 2700 // attach clusters to extrapolation chambers
2701 for(int iLayer=0; iLayer<kNPlanes-kNSeedPlanes; iLayer++){
2702 Int_t jLayer = planesExt[iLayer];
2703 if(!(chamber = stack[jLayer])) continue;
f29f13a6 2704 cseed[jLayer].AttachClusters(chamber, kTRUE);
5f1ae1e7 2705 cseed[jLayer].Fit();
be24510a 2706 }
4302c900 2707 fTrackQuality[ntracks] = 1.; // dummy value
2708 ntracks++;
218ba867 2709 if(ntracks == kMaxTracksStack) return ntracks;
4302c900 2710 cseed += 6;
2711 continue;
2712 }
2713
be24510a 2714
f29f13a6 2715 // Update Seeds and calculate Likelihood
d611c74f 2716 // fit tracklets and cook likelihood
f29f13a6 2717 FitTiltedRieman(&cseed[0], kTRUE);
2718 for(int iLayer=0; iLayer<kNSeedPlanes; iLayer++){
2719 Int_t jLayer = planes[iLayer];
2720 cseed[jLayer].Fit(kTRUE);
2721 }
91834b8d 2722 Double_t like = CookLikelihood(&cseed[0], planes); // to be checked
d611c74f 2723
4d6aee34 2724 if (TMath::Log(1.E-9 + like) < fkReconstructor->GetRecoParam() ->GetTrackLikelihood()){
d611c74f 2725 //AliInfo(Form("Failed likelihood %f[%e].", TMath::Log(1.E-9 + like), like));
2726 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2727 continue;
2728 }
2729 //AliInfo(Form("Passed likelihood %f[%e].", TMath::Log(1.E-9 + like), like));
2730
2731 // book preliminary results
2732 seedQuality[ntracks] = like;
2733 fSeedLayer[ntracks] = config;/*sLayer;*/
2734
2735 // attach clusters to the extrapolation seeds
be24510a 2736 for(int iLayer=0; iLayer<kNPlanes-kNSeedPlanes; iLayer++){
2737 Int_t jLayer = planesExt[iLayer];
d611c74f 2738 if(!(chamber = stack[jLayer])) continue;
d611c74f 2739
2740 // fit extrapolated seed
2741 if ((jLayer == 0) && !(cseed[1].IsOK())) continue;
2742 if ((jLayer == 5) && !(cseed[4].IsOK())) continue;
2743 AliTRDseedV1 pseed = cseed[jLayer];
f29f13a6 2744 if(!pseed.AttachClusters(chamber, kTRUE)) continue;
2745 pseed.Fit(kTRUE);
d611c74f 2746 cseed[jLayer] = pseed;
d611c74f 2747 FitTiltedRieman(cseed, kTRUE);
f29f13a6 2748 cseed[jLayer].Fit(kTRUE);
d611c74f 2749 }
2750
2751 // AliInfo("Extrapolation done.");
2752 // Debug Stream containing all the 6 tracklets
a2fbb6ec 2753 if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) >= 2 && fkReconstructor->IsDebugStreaming()){
2754 TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
d611c74f 2755 TLinearFitter *tiltedRieman = GetTiltedRiemanFitter();
2756 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2757 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2758 cstreamer << "MakeSeeds1"
2759 << "EventNumber=" << eventNumber
2760 << "CandidateNumber=" << candidateNumber
2761 << "S0.=" << &cseed[0]
2762 << "S1.=" << &cseed[1]
2763 << "S2.=" << &cseed[2]
2764 << "S3.=" << &cseed[3]
2765 << "S4.=" << &cseed[4]
2766 << "S5.=" << &cseed[5]
2767 << "FitterT.=" << tiltedRieman
2768 << "\n";
2769 }
2770
a2fbb6ec 2771 if(fkReconstructor->GetRecoParam()->HasImproveTracklets() && ImproveSeedQuality(stack, cseed) < 4){
d611c74f 2772 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2773 continue;
2774 }
2775 //AliInfo("Improve seed quality done.");
2776
2777 // fit full track and cook likelihoods
2778 // Double_t curv = FitRieman(&cseed[0], chi2);
2779 // Double_t chi2ZF = chi2[0] / TMath::Max((mlayers - 3.), 1.);
2780 // Double_t chi2RF = chi2[1] / TMath::Max((mlayers - 3.), 1.);
2781
2782 // do the final track fitting (Once with vertex constraint and once without vertex constraint)
2783 Double_t chi2Vals[3];
6e39bde4 2784 chi2Vals[0] = FitTiltedRieman(&cseed[0], kTRUE);
a2fbb6ec 2785 if(fkReconstructor->GetRecoParam()->IsVertexConstrained())
d611c74f 2786 chi2Vals[1] = FitTiltedRiemanConstraint(&cseed[0], GetZ()); // Do Vertex Constrained fit if desired
2787 else
2788 chi2Vals[1] = 1.;
2789 chi2Vals[2] = GetChi2Z(&cseed[0]) / TMath::Max((mlayers - 3.), 1.);
2790 // Chi2 definitions in testing stage
2791 //chi2Vals[2] = GetChi2ZTest(&cseed[0]);
2792 fTrackQuality[ntracks] = CalculateTrackLikelihood(&cseed[0], &chi2Vals[0]);
2793 //AliInfo("Hyperplane fit done\n");
fac58f00 2794
a2fbb6ec 2795 if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) >= 2 && fkReconstructor->IsDebugStreaming()){
2796 TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
d611c74f 2797 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2798 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2799 TLinearFitter *fitterTC = GetTiltedRiemanFitterConstraint();
2800 TLinearFitter *fitterT = GetTiltedRiemanFitter();
91834b8d 2801 Int_t ncls = 0;
2802 for(Int_t iseed = 0; iseed < kNPlanes; iseed++){
2803 ncls += cseed[iseed].IsOK() ? cseed[iseed].GetN2() : 0;
2804 }
d611c74f 2805 cstreamer << "MakeSeeds2"
2806 << "EventNumber=" << eventNumber
2807 << "CandidateNumber=" << candidateNumber
2808 << "Chi2TR=" << chi2Vals[0]
2809 << "Chi2TC=" << chi2Vals[1]
2810 << "Nlayers=" << mlayers
91834b8d 2811 << "NClusters=" << ncls
d611c74f 2812 << "Like=" << like
2813 << "S0.=" << &cseed[0]
2814 << "S1.=" << &cseed[1]
2815 << "S2.=" << &cseed[2]
2816 << "S3.=" << &cseed[3]
2817 << "S4.=" << &cseed[4]
2818 << "S5.=" << &cseed[5]
d611c74f 2819 << "FitterT.=" << fitterT
2820 << "FitterTC.=" << fitterTC
2821 << "\n";
2822 }
2823
2824 ntracks++;
2825 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2826 if(ntracks == kMaxTracksStack){
2827 AliWarning(Form("Number of seeds reached maximum allowed (%d) in stack.", kMaxTracksStack));
2828 return ntracks;
2829 }
2830 cseed += 6;
41702fec 2831 }
2832 }
2833 }
41702fec 2834
2835 return ntracks;
e4f2f73d 2836}
2837
2838//_____________________________________________________________________________
e17f4785 2839AliTRDtrackV1* AliTRDtrackerV1::MakeTrack(AliTRDseedV1 * const seeds, Double_t *params)
e4f2f73d 2840{
afa21247 2841//
2842// Build a TRD track out of tracklet candidates
2843//
2844// Parameters :
2845// seeds : array of tracklets
2846// params : array of track parameters as they are estimated by stand alone tracker. 7 elements.
2847// [0] - radial position of the track at reference point
2848// [1] - y position of the fit at [0]
2849// [2] - z position of the fit at [0]
2850// [3] - snp of the first tracklet
2851// [4] - tgl of the first tracklet
2852// [5] - curvature of the Riemann fit - 1/pt
2853// [6] - sector rotation angle
2854//
2855// Output :
2856// The TRD track.
2857//
2858// Initialize the TRD track based on the parameters of the fit and a parametric covariance matrix
2859// (diagonal with constant variance terms TODO - correct parameterization)
2860//
2861// In case of HLT just register the tracklets in the tracker and return values of the Riemann fit. For the
2862// offline case perform a full Kalman filter on the already found tracklets (see AliTRDtrackerV1::FollowBackProlongation()
2863// for details). Do also MC label calculation and PID if propagation successfully.
41702fec 2864
afa21247 2865
41702fec 2866 Double_t alpha = AliTRDgeometry::GetAlpha();
2867 Double_t shift = AliTRDgeometry::GetAlpha()/2.0;
2868 Double_t c[15];
2869
afa21247 2870 c[ 0] = 0.2; // s^2_y
2871 c[ 1] = 0.0; c[ 2] = 2.0; // s^2_z
2872 c[ 3] = 0.0; c[ 4] = 0.0; c[ 5] = 0.02; // s^2_snp
2873 c[ 6] = 0.0; c[ 7] = 0.0; c[ 8] = 0.0; c[ 9] = 0.1; // s^2_tgl
2874 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 2875
d20df6fc 2876 AliTRDtrackV1 track(seeds, &params[1], c, params[0], params[6]*alpha+shift);
2877 track.PropagateTo(params[0]-5.0);
4d6aee34 2878 AliTRDseedV1 *ptrTracklet = NULL;
9887cc9f 2879
2880 // skip Kalman filter for HLT
5f1ae1e7 2881 if(/*fkReconstructor->IsHLT()*/kFALSE){
9887cc9f 2882 for (Int_t jLayer = 0; jLayer < AliTRDgeometry::kNlayer; jLayer++) {
2883 track.UnsetTracklet(jLayer);
e17f4785 2884 ptrTracklet = &seeds[jLayer];
9887cc9f 2885 if(!ptrTracklet->IsOK()) continue;
5f1ae1e7 2886 if(TMath::Abs(ptrTracklet->GetYref(1) - ptrTracklet->GetYfit(1)) >= .2) continue; // check this condition with Marian
9887cc9f 2887 ptrTracklet = SetTracklet(ptrTracklet);
f29f13a6 2888 ptrTracklet->UseClusters();
91834b8d 2889 track.SetTracklet(ptrTracklet, fTracklets->GetEntriesFast()-1);
2890 }
d78d7df0 2891 AliTRDtrackV1 *ptrTrack = SetTrack(&track);
799e38d7 2892 ptrTrack->CookPID();
5f1ae1e7 2893 ptrTrack->CookLabel(.9);
4d6aee34 2894 ptrTrack->SetReconstructor(fkReconstructor);
d78d7df0 2895 return ptrTrack;
91834b8d 2896 }
393fda1c 2897
d20df6fc 2898 track.ResetCovariance(1);
e79f8eb0 2899 Int_t nc = TMath::Abs(FollowBackProlongation(track));
a2fbb6ec 2900 if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) > 5 && fkReconstructor->IsDebugStreaming()){
393fda1c 2901 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2902 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2903 Double_t p[5]; // Track Params for the Debug Stream
2904 track.GetExternalParameters(params[0], p);
a2fbb6ec 2905 TTreeSRedirector &cs = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
393fda1c 2906 cs << "MakeTrack"
2907 << "EventNumber=" << eventNumber
2908 << "CandidateNumber=" << candidateNumber
2909 << "nc=" << nc
2910 << "X=" << params[0]
2911 << "Y=" << p[0]
2912 << "Z=" << p[1]
2913 << "snp=" << p[2]
2914 << "tnd=" << p[3]
2915 << "crv=" << p[4]
2916 << "Yin=" << params[1]
2917 << "Zin=" << params[2]
2918 << "snpin=" << params[3]
2919 << "tndin=" << params[4]
2920 << "crvin=" << params[5]
2921 << "track.=" << &track
2922 << "\n";
2923 }
4d6aee34 2924 if (nc < 30) return NULL;
d20df6fc 2925
2926 AliTRDtrackV1 *ptrTrack = SetTrack(&track);
4d6aee34 2927 ptrTrack->SetReconstructor(fkReconstructor);
48f8adf3 2928 ptrTrack->CookLabel(.9);
24253b0a 2929
d20df6fc 2930 // computes PID for track
2931 ptrTrack->CookPID();
2932 // update calibration references using this track
48f8adf3 2933 AliTRDCalibraFillHisto *calibra = AliTRDCalibraFillHisto::Instance();
2934 if (!calibra){
2935 AliInfo("Could not get Calibra instance\n");
2936 if(calibra->GetHisto2d()) calibra->UpdateHistogramsV1(ptrTrack);
2937 }
d20df6fc 2938 return ptrTrack;
e4f2f73d 2939}
2940
0906e73e 2941
e4f2f73d 2942//____________________________________________________________________
eb38ed55 2943Int_t AliTRDtrackerV1::ImproveSeedQuality(AliTRDtrackingChamber **stack, AliTRDseedV1 *cseed)
e4f2f73d 2944{
41702fec 2945 //
2946 // Sort tracklets according to "quality" and try to "improve" the first 4 worst
2947 //
2948 // Parameters :
2949 // layers : Array of propagation layers for a stack/supermodule
2950 // cseed : Array of 6 seeding tracklets which has to be improved
2951 //
f29f13a6 2952 // Output :
41702fec 2953 // cssed : Improved seeds
2954 //
2955 // Detailed description
2956 //
2957 // Iterative procedure in which new clusters are searched for each
2958 // tracklet seed such that the seed quality (see AliTRDseed::GetQuality())
2959 // can be maximized. If some optimization is found the old seeds are replaced.
2960 //
2961 // debug level: 7
2962 //
2963
2964 // make a local working copy
4d6aee34 2965 AliTRDtrackingChamber *chamber = NULL;
41702fec 2966 AliTRDseedV1 bseed[6];
2967 Int_t nLayers = 0;
2968 for (Int_t jLayer = 0; jLayer < 6; jLayer++) bseed[jLayer] = cseed[jLayer];
2969
2970 Float_t lastquality = 10000.0;
2971 Float_t lastchi2 = 10000.0;
2972 Float_t chi2 = 1000.0;
2973
2974 for (Int_t iter = 0; iter < 4; iter++) {
2975 Float_t sumquality = 0.0;
2976 Float_t squality[6];
2977 Int_t sortindexes[6];
2978
2979 for (Int_t jLayer = 0; jLayer < 6; jLayer++) {
3a039a31 2980 squality[jLayer] = bseed[jLayer].IsOK() ? bseed[jLayer].GetQuality(kTRUE) : 1000.;
41702fec 2981 sumquality += squality[jLayer];
2982 }
2983 if ((sumquality >= lastquality) || (chi2 > lastchi2)) break;
2984
2985 nLayers = 0;
2986 lastquality = sumquality;
2987 lastchi2 = chi2;
2988 if (iter > 0) for (Int_t jLayer = 0; jLayer < 6; jLayer++) cseed[jLayer] = bseed[jLayer];
2989
2990 TMath::Sort(6, squality, sortindexes, kFALSE);
2991 for (Int_t jLayer = 5; jLayer > 1; jLayer--) {
2992 Int_t bLayer = sortindexes[jLayer];
2993 if(!(chamber = stack[bLayer])) continue;
f29f13a6 2994 bseed[bLayer].AttachClusters(chamber, kTRUE);
2995 bseed[bLayer].Fit(kTRUE);
41702fec 2996 if(bseed[bLayer].IsOK()) nLayers++;
2997 }
2998
2999 chi2 = FitTiltedRieman(bseed, kTRUE);
a2fbb6ec 3000 if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) >= 7 && fkReconstructor->IsDebugStreaming()){
41702fec 3001 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
3002 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
3003 TLinearFitter *tiltedRieman = GetTiltedRiemanFitter();
a2fbb6ec 3004 TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
41702fec 3005 cstreamer << "ImproveSeedQuality"
3006 << "EventNumber=" << eventNumber
3007 << "CandidateNumber=" << candidateNumber
3008 << "Iteration=" << iter
3009 << "S0.=" << &bseed[0]
3010 << "S1.=" << &bseed[1]
3011 << "S2.=" << &bseed[2]
3012 << "S3.=" << &bseed[3]
3013 << "S4.=" << &bseed[4]
3014 << "S5.=" << &bseed[5]
3015 << "FitterT.=" << tiltedRieman
3016 << "\n";
3017 }
3018 } // Loop: iter
41702fec 3019 // we are sure that at least 2 tracklets are OK !
3020 return nLayers+2;
e4f2f73d 3021}
3022
eb38ed55 3023//_________________________________________________________________________
4d6aee34 3024Double_t AliTRDtrackerV1::CalculateTrackLikelihood(const AliTRDseedV1 *const tracklets, Double_t *chi2){
41702fec 3025 //
3026 // Calculates the Track Likelihood value. This parameter serves as main quality criterion for
3027 // the track selection
3028 // The likelihood value containes:
3029 // - The chi2 values from the both fitters and the chi2 values in z-direction from a linear fit
3030 // - The Sum of the Parameter |slope_ref - slope_fit|/Sigma of the tracklets
3031 // For all Parameters an exponential dependency is used
3032 //
3033 // Parameters: - Array of tracklets (AliTRDseedV1) related to the track candidate
3034 // - Array of chi2 values:
3035 // * Non-Constrained Tilted Riemann fit
3036 // * Vertex-Constrained Tilted Riemann fit
3037 // * z-Direction from Linear fit
3038 // Output: - The calculated track likelihood
3039 //
3040 // debug level 2
3041 //
3042
f29f13a6 3043 Double_t chi2phi = 0, nLayers = 0;
41702fec 3044 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
3045 if(!tracklets[iLayer].IsOK()) continue;
f29f13a6 3046 chi2phi += tracklets[iLayer].GetChi2Phi();
41702fec 3047 nLayers++;
3048 }
f29f13a6 3049 chi2phi /= Float_t (nLayers - 2.0);
41702fec 3050
3051 Double_t likeChi2Z = TMath::Exp(-chi2[2] * 0.14); // Chi2Z
a2fbb6ec 3052 Double_t likeChi2TC = (fkReconstructor->GetRecoParam()->IsVertexConstrained()) ?
d20df6fc 3053 TMath::Exp(-chi2[1] * 0.677) : 1; // Constrained Tilted Riemann
6e39bde4 3054 Double_t likeChi2TR = TMath::Exp(-chi2[0] * 0.0078); // Non-constrained Tilted Riemann
3055 Double_t likeChi2Phi= TMath::Exp(-chi2phi * 3.23);//3.23
f29f13a6 3056 Double_t trackLikelihood = likeChi2Z * likeChi2TR * likeChi2Phi;
41702fec 3057
a2fbb6ec 3058 if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) >= 2 && fkReconstructor->IsDebugStreaming()){
41702fec 3059 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
3060 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
a2fbb6ec 3061 TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
41702fec 3062 cstreamer << "CalculateTrackLikelihood0"
3063 << "EventNumber=" << eventNumber
3064 << "CandidateNumber=" << candidateNumber
3065 << "LikeChi2Z=" << likeChi2Z
3066 << "LikeChi2TR=" << likeChi2TR
3067 << "LikeChi2TC=" << likeChi2TC
f29f13a6 3068 << "LikeChi2Phi=" << likeChi2Phi
41702fec 3069 << "TrackLikelihood=" << trackLikelihood
3070 << "\n";
3071 }
6e39bde4 3072
41702fec 3073 return trackLikelihood;
e4f2f73d 3074}
3075
3076//____________________________________________________________________
91834b8d 3077Double_t AliTRDtrackerV1::CookLikelihood(AliTRDseedV1 *cseed, Int_t planes[4])
e4f2f73d 3078{
41702fec 3079 //
3080 // Calculate the probability of this track candidate.
3081 //
3082 // Parameters :
3083 // cseeds : array of candidate tracklets
3084 // planes : array of seeding planes (see seeding configuration)
3085 // chi2 : chi2 values (on the Z and Y direction) from the rieman fit of the track.
3086 //
3087 // Output :
3088 // likelihood value
3089 //
3090 // Detailed description
3091 //
3092 // The track quality is estimated based on the following 4 criteria:
3093 // 1. precision of the rieman fit on the Y direction (likea)
3094 // 2. chi2 on the Y direction (likechi2y)
3095 // 3. chi2 on the Z direction (likechi2z)
3096 // 4. number of attached clusters compared to a reference value
3097 // (see AliTRDrecoParam::fkFindable) (likeN)
3098 //
3099 // The distributions for each type of probabilities are given below as of
3100 // (date). They have to be checked to assure consistency of estimation.
3101 //
3102
3103 // ratio of the total number of clusters/track which are expected to be found by the tracker.
4d6aee34 3104 const AliTRDrecoParam *fRecoPars = fkReconstructor->GetRecoParam();
41702fec 3105
91834b8d 3106 Double_t chi2y = GetChi2Y(&cseed[0]);
3107 Double_t chi2z = GetChi2Z(&cseed[0]);
3108
8ae98148 3109 Float_t nclusters = 0.;
41702fec 3110 Double_t sumda = 0.;
3111 for(UChar_t ilayer = 0; ilayer < 4; ilayer++){
3112 Int_t jlayer = planes[ilayer];
3113 nclusters += cseed[jlayer].GetN2();
e3cf3d02 3114 sumda += TMath::Abs(cseed[jlayer].GetYfit(1) - cseed[jlayer].GetYref(1));
41702fec 3115 }
8ae98148 3116 nclusters *= .25;
3117
5a2e200c 3118 Double_t likea = TMath::Exp(-sumda * fRecoPars->GetPhiSlope());
41702fec 3119 Double_t likechi2y = 0.0000000001;
4d6aee34 3120 if (fkReconstructor->IsCosmic() || chi2y < fRecoPars->GetChi2YCut()) likechi2y += TMath::Exp(-TMath::Sqrt(chi2y) * fRecoPars->GetChi2YSlope());
5a2e200c 3121 Double_t likechi2z = TMath::Exp(-chi2z * fRecoPars->GetChi2ZSlope());
8ae98148 3122 Double_t likeN = TMath::Exp(-(fRecoPars->GetNMeanClusters() - nclusters) / fRecoPars->GetNSigmaClusters());
41702fec 3123 Double_t like = likea * likechi2y * likechi2z * likeN;
3124
a2fbb6ec 3125 if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) >= 2 && fkReconstructor->IsDebugStreaming()){
41702fec 3126 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
3127 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
4d6aee34 3128 Int_t nTracklets = 0; Float_t meanNcls = 0;
91834b8d 3129 for(Int_t iseed=0; iseed < kNPlanes; iseed++){
3130 if(!cseed[iseed].IsOK()) continue;
3131 nTracklets++;
4d6aee34 3132 meanNcls += cseed[iseed].GetN2();
91834b8d 3133 }
4d6aee34 3134 if(nTracklets) meanNcls /= nTracklets;
41702fec 3135 // The Debug Stream contains the seed
a2fbb6ec 3136 TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
41702fec 3137 cstreamer << "CookLikelihood"
3138 << "EventNumber=" << eventNumber
3139 << "CandidateNumber=" << candidateNumber
3140 << "tracklet0.=" << &cseed[0]
3141 << "tracklet1.=" << &cseed[1]
3142 << "tracklet2.=" << &cseed[2]
3143 << "tracklet3.=" << &cseed[3]
3144 << "tracklet4.=" << &cseed[4]
3145 << "tracklet5.=" << &cseed[5]
3146 << "sumda=" << sumda
91834b8d 3147 << "chi2y=" << chi2y
3148 << "chi2z=" << chi2z
41702fec 3149 << "likea=" << likea
3150 << "likechi2y=" << likechi2y
3151 << "likechi2z=" << likechi2z
3152 << "nclusters=" << nclusters
3153 << "likeN=" << likeN
3154 << "like=" << like
4d6aee34 3155 << "meanncls=" << meanNcls
41702fec 3156 << "\n";
3157 }
3158
3159 return like;
e4f2f73d 3160}
3161
e4f2f73d 3162//____________________________________________________________________
0906e73e 3163void AliTRDtrackerV1::GetSeedingConfig(Int_t iconfig, Int_t planes[4])
e4f2f73d 3164{
41702fec 3165 //
3166 // Map seeding configurations to detector planes.
3167 //
3168 // Parameters :
3169 // iconfig : configuration index
3170 // planes : member planes of this configuration. On input empty.
3171 //
3172 // Output :
3173 // planes : contains the planes which are defining the configuration
3174 //
3175 // Detailed description
3176 //
3177 // Here is the list of seeding planes configurations together with
3178 // their topological classification:
3179 //
3180 // 0 - 5432 TQ 0
3181 // 1 - 4321 TQ 0
3182 // 2 - 3210 TQ 0
3183 // 3 - 5321 TQ 1
3184 // 4 - 4210 TQ 1
3185 // 5 - 5431 TQ 1
3186 // 6 - 4320 TQ 1
3187 // 7 - 5430 TQ 2
3188 // 8 - 5210 TQ 2
3189 // 9 - 5421 TQ 3
3190 // 10 - 4310 TQ 3
3191 // 11 - 5410 TQ 4
3192 // 12 - 5420 TQ 5
3193 // 13 - 5320 TQ 5
3194 // 14 - 5310 TQ 5
3195 //
3196 // The topologic quality is modeled as follows:
3197 // 1. The general model is define by the equation:
3198 // p(conf) = exp(-conf/2)
3199 // 2. According to the topologic classification, configurations from the same
3200 // class are assigned the agerage value over the model values.
3201 // 3. Quality values are normalized.
3202 //
3203 // The topologic quality distribution as function of configuration is given below:
3204 //Begin_Html
3205 // <img src="gif/topologicQA.gif">
3206 //End_Html
3207 //
3208
3209 switch(iconfig){
3210 case 0: // 5432 TQ 0
3211 planes[0] = 2;
3212 planes[1] = 3;
3213 planes[2] = 4;
3214 planes[3] = 5;
3215 break;
3216 case 1: // 4321 TQ 0
3217 planes[0] = 1;
3218 planes[1] = 2;
3219 planes[2] = 3;
3220 planes[3] = 4;
3221 break;
3222 case 2: // 3210 TQ 0
3223 planes[0] = 0;
3224 planes[1] = 1;
3225 planes[2] = 2;
3226 planes[3] = 3;
3227 break;
3228 case 3: // 5321 TQ 1
3229 planes[0] = 1;