fix compiler warnings
[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
7c3eecb8 681 Int_t debugLevel = fkReconstructor->IsDebugStreaming() ? fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) : 0;
682 TTreeSRedirector *cstreamer = fkReconstructor->IsDebugStreaming() ? fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker) : 0x0;
683
4d6aee34 684 AliTRDseedV1 tracklet, *ptrTracklet = NULL;
181d2c97 685 // in case of stand alone tracking we store all the pointers to the tracklets in a temporary array
686 AliTRDseedV1 *tracklets[kNPlanes];
687 memset(tracklets, 0, sizeof(AliTRDseedV1 *) * kNPlanes);
688 for(Int_t ip = 0; ip < kNPlanes; ip++){
689 tracklets[ip] = t.GetTracklet(ip);
690 t.UnsetTracklet(ip);
691 }
81a6494d 692 Bool_t kStoreIn = kTRUE, kPropagateIn = kTRUE;
e3cf3d02 693
053767a4 694 // Loop through the TRD layers
4d6aee34 695 TGeoHMatrix *matrix = NULL;
eb2b4f91 696 Double_t x, y, z;
697 for (Int_t ily=0, sm=-1, stk=-1, det=-1; ily < AliTRDgeometry::kNlayer; ily++) {
698 // rough estimate of the entry point
699 if (!t.GetProlongation(fR[ily], y, z)){
700 n=-1;
701 t.SetStatus(AliTRDtrackV1::kProlongation);
702 break;
703 }
41702fec 704
eb2b4f91 705 // find sector / stack / detector
706 sm = t.GetSector();
707 // TODO cross check with y value !
708 stk = fGeom->GetStack(z, ily);
709 det = stk>=0 ? AliTRDgeometry::GetDetector(ily, stk, sm) : -1;
4d6aee34 710 matrix = det>=0 ? fGeom->GetClusterMatrix(det) : NULL;
eb2b4f91 711
712 // check if supermodule/chamber is installed
713 if( !fGeom->GetSMstatus(sm) ||
714 stk<0. ||
715 fGeom->IsHole(ily, stk, sm) ||
716 !matrix ){
717 // propagate to the default radial position
718 if(fR[ily] > (fgkMaxStep + t.GetX()) && !PropagateToX(t, fR[ily], fgkMaxStep)){
719 n=-1;
720 t.SetStatus(AliTRDtrackV1::kPropagation);
41702fec 721 break;
722 }
eb2b4f91 723 if(!AdjustSector(&t)){
724 n=-1;
725 t.SetStatus(AliTRDtrackV1::kAdjustSector);
726 break;
727 }
728 if(TMath::Abs(t.GetSnp()) > fgkMaxSnp){
729 n=-1;
730 t.SetStatus(AliTRDtrackV1::kSnp);
731 break;
732 }
733 t.SetStatus(AliTRDtrackV1::kGeometry, ily);
41702fec 734 continue;
735 }
e3cf3d02 736
eb2b4f91 737 // retrieve rotation matrix for the current chamber
738 Double_t loc[] = {AliTRDgeometry::AnodePos()- driftLength, 0., 0.};
739 Double_t glb[] = {0., 0., 0.};
740 matrix->LocalToMaster(loc, glb);
741
742 // Propagate to the radial distance of the current layer
743 x = glb[0] - fgkMaxStep;
744 if(x > (fgkMaxStep + t.GetX()) && !PropagateToX(t, x, fgkMaxStep)){
745 n=-1;
746 t.SetStatus(AliTRDtrackV1::kPropagation);
747 break;
748 }
749 if(!AdjustSector(&t)){
750 n=-1;
751 t.SetStatus(AliTRDtrackV1::kAdjustSector);
752 break;
753 }
754 if(TMath::Abs(t.GetSnp()) > fgkMaxSnp) {
755 n=-1;
756 t.SetStatus(AliTRDtrackV1::kSnp);
757 break;
758 }
4d6aee34 759 Bool_t doRecalculate = kFALSE;
eb2b4f91 760 if(sm != t.GetSector()){
761 sm = t.GetSector();
4d6aee34 762 doRecalculate = kTRUE;
eb2b4f91 763 }
764 if(stk != fGeom->GetStack(z, ily)){
765 stk = fGeom->GetStack(z, ily);
4d6aee34 766 doRecalculate = kTRUE;
eb2b4f91 767 }
4d6aee34 768 if(doRecalculate){
eb2b4f91 769 det = AliTRDgeometry::GetDetector(ily, stk, sm);
770 if(!(matrix = fGeom->GetClusterMatrix(det))){
771 t.SetStatus(AliTRDtrackV1::kGeometry, ily);
772 continue;
773 }
774 matrix->LocalToMaster(loc, glb);
775 x = glb[0] - fgkMaxStep;
776 }
777
778 // check if track is well inside fiducial volume
779 if (!t.GetProlongation(x+fgkMaxStep, y, z)) {
780 n=-1;
781 t.SetStatus(AliTRDtrackV1::kProlongation);
782 break;
783 }
784 if(fGeom->IsOnBoundary(det, y, z, .5)){
785 t.SetStatus(AliTRDtrackV1::kBoundary, ily);
786 continue;
787 }
788 // mark track as entering the FIDUCIAL volume of TRD
e3cf3d02 789 if(kStoreIn){
790 t.SetTrackLow();
791 kStoreIn = kFALSE;
792 }
b1957d3c 793
eb2b4f91 794 ptrTracklet = tracklets[ily];
795 if(!ptrTracklet){ // BUILD TRACKLET
796 // check data in supermodule
797 if(!fTrSec[sm].GetNChambers()){
798 t.SetStatus(AliTRDtrackV1::kNoClusters, ily);
799 continue;
800 }
801 if(fTrSec[sm].GetX(ily) < 1.){
802 t.SetStatus(AliTRDtrackV1::kNoClusters, ily);
803 continue;
804 }
805
806 // check data in chamber
807 if(!(chamber = fTrSec[sm].GetChamber(stk, ily))){
808 t.SetStatus(AliTRDtrackV1::kNoClusters, ily);
809 continue;
810 }
4d6aee34 811 if(chamber->GetNClusters() < fgNTimeBins*fkReconstructor->GetRecoParam() ->GetFindableClusters()){
eb2b4f91 812 t.SetStatus(AliTRDtrackV1::kNoClusters, ily);
813 continue;
814 }
815 // build tracklet
816 ptrTracklet = new(&tracklet) AliTRDseedV1(det);
4d6aee34 817 ptrTracklet->SetReconstructor(fkReconstructor);
eb2b4f91 818 ptrTracklet->SetKink(t.IsKink());
819 ptrTracklet->SetPadPlane(fGeom->GetPadPlane(ily, stk));
820 ptrTracklet->SetX0(glb[0]+driftLength);
821 if(!tracklet.Init(&t)){
822 n=-1;
823 t.SetStatus(AliTRDtrackV1::kTrackletInit);
824 break;
825 }
826 if(!tracklet.AttachClusters(chamber, kTRUE)){
827 t.SetStatus(AliTRDtrackV1::kNoAttach, ily);
7c3eecb8 828 if(debugLevel>3){
829 AliTRDseedV1 trackletCp(*ptrTracklet);
830 UChar_t status(t.GetStatusTRD(ily));
831 (*cstreamer) << "FollowBackProlongation2"
832 <<"status=" << status
833 <<"tracklet.=" << &trackletCp
834 << "\n";
835 }
eb2b4f91 836 continue;
837 }
4d6aee34 838 if(tracklet.GetN() < fgNTimeBins*fkReconstructor->GetRecoParam() ->GetFindableClusters()){
eb2b4f91 839 t.SetStatus(AliTRDtrackV1::kNoClustersTracklet, ily);
7c3eecb8 840 if(debugLevel>3){
841 AliTRDseedV1 trackletCp(*ptrTracklet);
842 UChar_t status(t.GetStatusTRD(ily));
843 (*cstreamer) << "FollowBackProlongation2"
844 <<"status=" << status
845 <<"tracklet.=" << &trackletCp
846 << "\n";
847 }
eb2b4f91 848 continue;
849 }
850 ptrTracklet->UpdateUsed();
851 }
eb2b4f91 852 // propagate track to the radial position of the tracklet
853 ptrTracklet->UseClusters(); // TODO ? do we need this here ?
854 // fit tracklet no tilt correction
855 if(!ptrTracklet->Fit(kFALSE)){
856 t.SetStatus(AliTRDtrackV1::kNoFit, ily);
857 continue;
858 }
859 x = ptrTracklet->GetX(); //GetX0();
860 if(x > (fgkMaxStep + t.GetX()) && !PropagateToX(t, x, fgkMaxStep)) {
861 n=-1;
862 t.SetStatus(AliTRDtrackV1::kPropagation);
863 break;
864 }
865 if(!AdjustSector(&t)) {
866 n=-1;
867 t.SetStatus(AliTRDtrackV1::kAdjustSector);
868 break;
41702fec 869 }
eb2b4f91 870 if(TMath::Abs(t.GetSnp()) > fgkMaxSnp) {
871 n=-1;
872 t.SetStatus(AliTRDtrackV1::kSnp);
873 break;
874 }
81a6494d 875 if(kPropagateIn){
876 t.SetTrackLow();
877 kPropagateIn = kFALSE;
878 }
b72f4eaf 879 Double_t cov[3]; ptrTracklet->GetCovAt(x, cov);
880 Double_t p[2] = { ptrTracklet->GetY(), ptrTracklet->GetZ()};
881 Double_t chi2 = ((AliExternalTrackParam)t).GetPredictedChi2(p, cov);
6e39bde4 882 // update Kalman with the TRD measurement
b72f4eaf 883 if(chi2>1e+10){ // TODO
eb2b4f91 884 t.SetStatus(AliTRDtrackV1::kChi2, ily);
7c3eecb8 885 if(debugLevel > 2){
886 UChar_t status(t.GetStatusTRD());
887 AliTRDseedV1 trackletCp(*ptrTracklet);
888 AliTRDtrackV1 trackCp(t);
889 trackCp.SetOwner();
890 (*cstreamer) << "FollowBackProlongation1"
891 << "status=" << status
892 << "tracklet.=" << &trackletCp
893 << "track.=" << &trackCp
894 << "\n";
895 }
eb2b4f91 896 continue;
897 }
b72f4eaf 898 if(!t.Update(p, cov, chi2)) {
eb2b4f91 899 n=-1;
900 t.SetStatus(AliTRDtrackV1::kUpdate);
7c3eecb8 901 if(debugLevel > 2){
902 UChar_t status(t.GetStatusTRD());
903 AliTRDseedV1 trackletCp(*ptrTracklet);
904 AliTRDtrackV1 trackCp(t);
905 trackCp.SetOwner();
906 (*cstreamer) << "FollowBackProlongation1"
907 << "status=" << status
908 << "tracklet.=" << &trackletCp
909 << "track.=" << &trackCp
910 << "\n";
911 }
eb2b4f91 912 break;
913 }
b72f4eaf 914 // fill residuals ?!
915 AliTracker::FillResiduals(&t, p, cov, ptrTracklet->GetVolumeId());
916
eb2b4f91 917
918 // load tracklet to the tracker
16cca13f 919 ptrTracklet->Update(&t);
eb2b4f91 920 ptrTracklet = SetTracklet(ptrTracklet);
921 t.SetTracklet(ptrTracklet, fTracklets->GetEntriesFast()-1);
922 n += ptrTracklet->GetN();
923
41702fec 924 // Reset material budget if 2 consecutive gold
eb2b4f91 925// if(ilayer>0 && t.GetTracklet(ilayer-1) && ptrTracklet->GetN() + t.GetTracklet(ilayer-1)->GetN() > 20) t.SetBudget(2, 0.);
41702fec 926
927 // Make backup of the track until is gold
928 // TO DO update quality check of the track.
929 // consider comparison with fTimeBinsRange
930 Float_t ratio0 = ptrTracklet->GetN() / Float_t(fgNTimeBins);
931 //Float_t ratio1 = Float_t(t.GetNumberOfClusters()+1) / Float_t(t.GetNExpected()+1);
41702fec 932
eb2b4f91 933 if( (chi2 < 18.0) &&
41702fec 934 (ratio0 > 0.8) &&
935 //(ratio1 > 0.6) &&
936 //(ratio0+ratio1 > 1.5) &&
937 (t.GetNCross() == 0) &&
938 (TMath::Abs(t.GetSnp()) < 0.85) &&
e3cf3d02 939 (t.GetNumberOfClusters() > 20)){
940 t.MakeBackupTrack();
941 }
053767a4 942 } // end layers loop
eb2b4f91 943 //printf("clusters[%d] chi2[%f] x[%f] status[%d ", n, t.GetChi2(), t.GetX(), t.GetStatusTRD());
944 //for(int i=0; i<6; i++) printf("%d ", t.GetStatusTRD(i)); printf("]\n");
41702fec 945
7c3eecb8 946 if(debugLevel > 1){
41702fec 947 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
eb2b4f91 948 AliTRDtrackV1 track(t);
949 track.SetOwner();
7c3eecb8 950 (*cstreamer) << "FollowBackProlongation0"
eb2b4f91 951 << "EventNumber=" << eventNumber
952 << "ncl=" << n
953 << "track.=" << &track
41702fec 954 << "\n";
955 }
956
eb2b4f91 957 return n;
0906e73e 958}
959
eb38ed55 960//_________________________________________________________________________
4d6aee34 961Float_t AliTRDtrackerV1::FitRieman(AliTRDseedV1 *tracklets, Double_t *chi2, Int_t *const planes){
41702fec 962 //
963 // Fits a Riemann-circle to the given points without tilting pad correction.
964 // The fit is performed using an instance of the class AliRieman (equations
965 // and transformations see documentation of this class)
966 // Afterwards all the tracklets are Updated
967 //
968 // Parameters: - Array of tracklets (AliTRDseedV1)
969 // - Storage for the chi2 values (beginning with direction z)
970 // - Seeding configuration
971 // Output: - The curvature
972 //
973 AliRieman *fitter = AliTRDtrackerV1::GetRiemanFitter();
974 fitter->Reset();
975 Int_t allplanes[] = {0, 1, 2, 3, 4, 5};
976 Int_t *ppl = &allplanes[0];
977 Int_t maxLayers = 6;
978 if(planes){
979 maxLayers = 4;
980 ppl = planes;
981 }
982 for(Int_t il = 0; il < maxLayers; il++){
983 if(!tracklets[ppl[il]].IsOK()) continue;
e3cf3d02 984 fitter->AddPoint(tracklets[ppl[il]].GetX0(), tracklets[ppl[il]].GetYfit(0), tracklets[ppl[il]].GetZfit(0),1,10);
41702fec 985 }
986 fitter->Update();
987 // Set the reference position of the fit and calculate the chi2 values
988 memset(chi2, 0, sizeof(Double_t) * 2);
989 for(Int_t il = 0; il < maxLayers; il++){
990 // Reference positions
991 tracklets[ppl[il]].Init(fitter);
992
993 // chi2
994 if((!tracklets[ppl[il]].IsOK()) && (!planes)) continue;
995 chi2[0] += tracklets[ppl[il]].GetChi2Y();
996 chi2[1] += tracklets[ppl[il]].GetChi2Z();
997 }
998 return fitter->GetC();
eb38ed55 999}
1000
1001//_________________________________________________________________________
1002void AliTRDtrackerV1::FitRieman(AliTRDcluster **seedcl, Double_t chi2[2])
1003{
41702fec 1004 //
1005 // Performs a Riemann helix fit using the seedclusters as spacepoints
1006 // Afterwards the chi2 values are calculated and the seeds are updated
1007 //
1008 // Parameters: - The four seedclusters
1009 // - The tracklet array (AliTRDseedV1)
1010 // - The seeding configuration
1011 // - Chi2 array
1012 //
1013 // debug level 2
1014 //
1015 AliRieman *fitter = AliTRDtrackerV1::GetRiemanFitter();
1016 fitter->Reset();
a3743898 1017 for(Int_t i = 0; i < 4; i++){
a3743898 1018 fitter->AddPoint(seedcl[i]->GetX(), seedcl[i]->GetY(), seedcl[i]->GetZ(), 1., 10.);
1019 }
41702fec 1020 fitter->Update();
1021
1022
1023 // Update the seed and calculated the chi2 value
1024 chi2[0] = 0; chi2[1] = 0;
1025 for(Int_t ipl = 0; ipl < kNSeedPlanes; ipl++){
1026 // chi2
1027 chi2[0] += (seedcl[ipl]->GetZ() - fitter->GetZat(seedcl[ipl]->GetX())) * (seedcl[ipl]->GetZ() - fitter->GetZat(seedcl[ipl]->GetX()));
1028 chi2[1] += (seedcl[ipl]->GetY() - fitter->GetYat(seedcl[ipl]->GetX())) * (seedcl[ipl]->GetY() - fitter->GetYat(seedcl[ipl]->GetX()));
1029 }
eb38ed55 1030}
1031
1032
1033//_________________________________________________________________________
1034Float_t AliTRDtrackerV1::FitTiltedRiemanConstraint(AliTRDseedV1 *tracklets, Double_t zVertex)
1035{
41702fec 1036 //
1037 // Fits a helix to the clusters. Pad tilting is considered. As constraint it is
1038 // assumed that the vertex position is set to 0.
1039 // This method is very usefull for high-pt particles
1040 // Basis for the fit: (x - x0)^2 + (y - y0)^2 - R^2 = 0
1041 // x0, y0: Center of the circle
1042 // Measured y-position: ymeas = y - tan(phiT)(zc - zt)
1043 // zc: center of the pad row
1044 // Equation which has to be fitted (after transformation):
1045 // a + b * u + e * v + 2*(ymeas + tan(phiT)(z - zVertex))*t = 0
1046 // Transformation:
1047 // t = 1/(x^2 + y^2)
1048 // u = 2 * x * t
1049 // v = 2 * x * tan(phiT) * t
1050 // Parameters in the equation:
1051 // a = -1/y0, b = x0/y0, e = dz/dx
1052 //
1053 // The Curvature is calculated by the following equation:
1054 // - curv = a/Sqrt(b^2 + 1) = 1/R
1055 // Parameters: - the 6 tracklets
1056 // - the Vertex constraint
1057 // Output: - the Chi2 value of the track
1058 //
1059 // debug level 5
1060 //
1061
1062 TLinearFitter *fitter = GetTiltedRiemanFitterConstraint();
1063 fitter->StoreData(kTRUE);
1064 fitter->ClearPoints();
4d6aee34 1065 AliTRDcluster *cl = NULL;
41702fec 1066
1067 Float_t x, y, z, w, t, error, tilt;
1068 Double_t uvt[2];
1069 Int_t nPoints = 0;
053767a4 1070 for(Int_t ilr = 0; ilr < AliTRDgeometry::kNlayer; ilr++){
1071 if(!tracklets[ilr].IsOK()) continue;
8d2bec9e 1072 for(Int_t itb = 0; itb < AliTRDseedV1::kNclusters; itb++){
053767a4 1073 if(!tracklets[ilr].IsUsable(itb)) continue;
1074 cl = tracklets[ilr].GetClusters(itb);
1742f24c 1075 if(!cl->IsInChamber()) continue;
41702fec 1076 x = cl->GetX();
1077 y = cl->GetY();
1078 z = cl->GetZ();
053767a4 1079 tilt = tracklets[ilr].GetTilt();
41702fec 1080 // Transformation
1081 t = 1./(x * x + y * y);
1082 uvt[0] = 2. * x * t;
1083 uvt[1] = 2. * x * t * tilt ;
1084 w = 2. * (y + tilt * (z - zVertex)) * t;
78b7d24c 1085 error = 2. * TMath::Sqrt(cl->GetSigmaY2()+tilt*tilt*cl->GetSigmaZ2()) * t;
41702fec 1086 fitter->AddPoint(uvt, w, error);
1087 nPoints++;
1088 }
1089 }
e17f4785 1090 fitter->Eval();
41702fec 1091
1092 // Calculate curvature
1093 Double_t a = fitter->GetParameter(0);
1094 Double_t b = fitter->GetParameter(1);
1095 Double_t curvature = a/TMath::Sqrt(b*b + 1);
1096
1097 Float_t chi2track = fitter->GetChisquare()/Double_t(nPoints);
1098 for(Int_t ip = 0; ip < AliTRDtrackerV1::kNPlanes; ip++)
e3cf3d02 1099 tracklets[ip].SetC(curvature);
41702fec 1100
a2fbb6ec 1101/* if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker()) >= 5){
41702fec 1102 //Linear Model on z-direction
1103 Double_t xref = CalculateReferenceX(tracklets); // Relative to the middle of the stack
1104 Double_t slope = fitter->GetParameter(2);
1105 Double_t zref = slope * xref;
1106 Float_t chi2Z = CalculateChi2Z(tracklets, zref, slope, xref);
1107 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
1108 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
4d6aee34 1109 TTreeSRedirector &treeStreamer = *fkReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
41702fec 1110 treeStreamer << "FitTiltedRiemanConstraint"
1111 << "EventNumber=" << eventNumber
1112 << "CandidateNumber=" << candidateNumber
1113 << "Curvature=" << curvature
1114 << "Chi2Track=" << chi2track
1115 << "Chi2Z=" << chi2Z
1116 << "zref=" << zref
1117 << "\n";
3a039a31 1118 }*/
41702fec 1119 return chi2track;
eb38ed55 1120}
1121
1122//_________________________________________________________________________
1123Float_t AliTRDtrackerV1::FitTiltedRieman(AliTRDseedV1 *tracklets, Bool_t sigError)
1124{
41702fec 1125 //
1126 // Performs a Riemann fit taking tilting pad correction into account
1127 // The equation of a Riemann circle, where the y position is substituted by the
1128 // measured y-position taking pad tilting into account, has to be transformed
1129 // into a 4-dimensional hyperplane equation
1130 // Riemann circle: (x-x0)^2 + (y-y0)^2 -R^2 = 0
1131 // Measured y-Position: ymeas = y - tan(phiT)(zc - zt)
1132 // zc: center of the pad row
1133 // zt: z-position of the track
1134 // The z-position of the track is assumed to be linear dependent on the x-position
1135 // Transformed equation: a + b * u + c * t + d * v + e * w - 2 * (ymeas + tan(phiT) * zc) * t = 0
1136 // Transformation: u = 2 * x * t
1137 // v = 2 * tan(phiT) * t
1138 // w = 2 * tan(phiT) * (x - xref) * t
1139 // t = 1 / (x^2 + ymeas^2)
1140 // Parameters: a = -1/y0
1141 // b = x0/y0
1142 // c = (R^2 -x0^2 - y0^2)/y0
1143 // d = offset
1144 // e = dz/dx
1145 // If the offset respectively the slope in z-position is impossible, the parameters are fixed using
1146 // results from the simple riemann fit. Afterwards the fit is redone.
1147 // The curvature is calculated according to the formula:
1148 // curv = a/(1 + b^2 + c*a) = 1/R
1149 //
1150 // Paramters: - Array of tracklets (connected to the track candidate)
1151 // - Flag selecting the error definition
1152 // Output: - Chi2 values of the track (in Parameter list)
1153 //
1154 TLinearFitter *fitter = GetTiltedRiemanFitter();
1155 fitter->StoreData(kTRUE);
1156 fitter->ClearPoints();
1157 AliTRDLeastSquare zfitter;
4d6aee34 1158 AliTRDcluster *cl = NULL;
41702fec 1159
1160 Double_t xref = CalculateReferenceX(tracklets);
6e39bde4 1161 Double_t x, y, z, t, tilt, dx, w, we, erry, errz;
1162 Double_t uvt[4], sumPolY[5], sumPolZ[3];
1163 memset(sumPolY, 0, sizeof(Double_t) * 5);
1164 memset(sumPolZ, 0, sizeof(Double_t) * 3);
41702fec 1165 Int_t nPoints = 0;
1166 // Containers for Least-square fitter
1167 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1168 if(!tracklets[ipl].IsOK()) continue;
ed15ef4f 1169 tilt = tracklets[ipl].GetTilt();
8d2bec9e 1170 for(Int_t itb = 0; itb < AliTRDseedV1::kNclusters; itb++){
41702fec 1171 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1742f24c 1172 if(!cl->IsInChamber()) continue;
41702fec 1173 if (!tracklets[ipl].IsUsable(itb)) continue;
1174 x = cl->GetX();
1175 y = cl->GetY();
1176 z = cl->GetZ();
41702fec 1177 dx = x - xref;
1178 // Transformation
1179 t = 1./(x*x + y*y);
1180 uvt[0] = 2. * x * t;
1181 uvt[1] = t;
1182 uvt[2] = 2. * tilt * t;
1183 uvt[3] = 2. * tilt * dx * t;
1184 w = 2. * (y + tilt*z) * t;
1185 // error definition changes for the different calls
1186 we = 2. * t;
78b7d24c 1187 we *= sigError ? TMath::Sqrt(cl->GetSigmaY2()+tilt*tilt*cl->GetSigmaZ2()) : 0.2;
41702fec 1188 fitter->AddPoint(uvt, w, we);
1189 zfitter.AddPoint(&x, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
6e39bde4 1190 // adding points for covariance matrix estimation
1191 erry = 1./(TMath::Sqrt(cl->GetSigmaY2()) + 0.1); // 0.1 is a systematic error (due to misalignment and miscalibration)
1192 erry *= erry;
1193 errz = 1./cl->GetSigmaZ2();
1194 for(Int_t ipol = 0; ipol < 5; ipol++){
1195 sumPolY[ipol] += erry;
1196 erry *= x;
1197 if(ipol < 3){
1198 sumPolZ[ipol] += errz;
1199 errz *= x;
1200 }
1201 }
41702fec 1202 nPoints++;
1203 }
1204 }
e17f4785 1205 fitter->Eval();
41702fec 1206 zfitter.Eval();
1207
1208 Double_t offset = fitter->GetParameter(3);
1209 Double_t slope = fitter->GetParameter(4);
1210
1211 // Linear fitter - not possible to make boundaries
1212 // Do not accept non possible z and dzdx combinations
1213 Bool_t acceptablez = kTRUE;
1214 Double_t zref = 0.0;
1215 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
1216 if(!tracklets[iLayer].IsOK()) continue;
1217 zref = offset + slope * (tracklets[iLayer].GetX0() - xref);
e3cf3d02 1218 if (TMath::Abs(tracklets[iLayer].GetZfit(0) - zref) > tracklets[iLayer].GetPadLength() * 0.5 + 1.0)
41702fec 1219 acceptablez = kFALSE;
1220 }
1221 if (!acceptablez) {
1222 Double_t dzmf = zfitter.GetFunctionParameter(1);
1223 Double_t zmf = zfitter.GetFunctionValue(&xref);
1224 fgTiltedRieman->FixParameter(3, zmf);
1225 fgTiltedRieman->FixParameter(4, dzmf);
e17f4785 1226 fitter->Eval();
41702fec 1227 fitter->ReleaseParameter(3);
1228 fitter->ReleaseParameter(4);
1229 offset = fitter->GetParameter(3);
1230 slope = fitter->GetParameter(4);
1231 }
1232
1233 // Calculate Curvarture
1234 Double_t a = fitter->GetParameter(0);
1235 Double_t b = fitter->GetParameter(1);
1236 Double_t c = fitter->GetParameter(2);
1237 Double_t curvature = 1.0 + b*b - c*a;
1238 if (curvature > 0.0)
1239 curvature = a / TMath::Sqrt(curvature);
1240
1241 Double_t chi2track = fitter->GetChisquare()/Double_t(nPoints);
1242
6e39bde4 1243 // Prepare error calculation
1244 TMatrixD covarPolY(3,3);
1245 covarPolY(0,0) = sumPolY[0]; covarPolY(1,1) = sumPolY[2]; covarPolY(2,2) = sumPolY[4];
1246 covarPolY(0,1) = covarPolY(1,0) = sumPolY[1];
1247 covarPolY(0,2) = covarPolY(2,0) = sumPolY[2];
1248 covarPolY(2,1) = covarPolY(1,2) = sumPolY[3];
1249 covarPolY.Invert();
1250 TMatrixD covarPolZ(2,2);
1251 covarPolZ(0,0) = sumPolZ[0]; covarPolZ(1,1) = sumPolZ[2];
1252 covarPolZ(1,0) = covarPolZ(0,1) = sumPolZ[1];
1253 covarPolZ.Invert();
1254
41702fec 1255 // Update the tracklets
6e39bde4 1256 Double_t x1, dy, dz;
1257 Double_t cov[15];
1258 memset(cov, 0, sizeof(Double_t) * 15);
41702fec 1259 for(Int_t iLayer = 0; iLayer < AliTRDtrackerV1::kNPlanes; iLayer++) {
1260
1261 x = tracklets[iLayer].GetX0();
6e39bde4 1262 x1 = x - xref;
41702fec 1263 y = 0;
1264 z = 0;
1265 dy = 0;
1266 dz = 0;
6e39bde4 1267 memset(cov, 0, sizeof(Double_t) * 3);
1268 TMatrixD transform(3,3);
1269 transform(0,0) = 1;
1270 transform(0,1) = x;
1271 transform(0,2) = x*x;
1272 transform(1,1) = 1;
1273 transform(1,2) = x;
1274 transform(2,2) = 1;
1275 TMatrixD covariance(transform, TMatrixD::kMult, covarPolY);
1276 covariance *= transform.T();
1277 TMatrixD transformZ(2,2);
1278 transformZ(0,0) = transformZ(1,1) = 1;
1279 transformZ(0,1) = x;
1280 TMatrixD covarZ(transformZ, TMatrixD::kMult, covarPolZ);
1281 covarZ *= transformZ.T();
41702fec 1282 // y: R^2 = (x - x0)^2 + (y - y0)^2
1283 // => y = y0 +/- Sqrt(R^2 - (x - x0)^2)
1284 // R = Sqrt() = 1/Curvature
1285 // => y = y0 +/- Sqrt(1/Curvature^2 - (x - x0)^2)
1286 Double_t res = (x * a + b); // = (x - x0)/y0
1287 res *= res;
1288 res = 1.0 - c * a + b * b - res; // = (R^2 - (x - x0)^2)/y0^2
1289 if (res >= 0) {
1290 res = TMath::Sqrt(res);
1291 y = (1.0 - res) / a;
1292 }
6e39bde4 1293 cov[0] = covariance(0,0);
1294 cov[2] = covarZ(0,0);
1295 cov[1] = 0.;
41702fec 1296
1297 // dy: R^2 = (x - x0)^2 + (y - y0)^2
1298 // => y = +/- Sqrt(R^2 - (x - x0)^2) + y0
1299 // => dy/dx = (x - x0)/Sqrt(R^2 - (x - x0)^2)
1300 // Curvature: cr = 1/R = a/Sqrt(1 + b^2 - c*a)
1301 // => dy/dx = (x - x0)/(1/(cr^2) - (x - x0)^2)
1302 Double_t x0 = -b / a;
1303 if (-c * a + b * b + 1 > 0) {
1304 if (1.0/(curvature * curvature) - (x - x0) * (x - x0) > 0.0) {
6e39bde4 1305 Double_t yderiv = (x - x0) / TMath::Sqrt(1.0/(curvature * curvature) - (x - x0) * (x - x0));
1306 if (a < 0) yderiv *= -1.0;
1307 dy = yderiv;
41702fec 1308 }
1309 }
1310 z = offset + slope * (x - xref);
1311 dz = slope;
1312 tracklets[iLayer].SetYref(0, y);
1313 tracklets[iLayer].SetYref(1, dy);
1314 tracklets[iLayer].SetZref(0, z);
1315 tracklets[iLayer].SetZref(1, dz);
1316 tracklets[iLayer].SetC(curvature);
6e39bde4 1317 tracklets[iLayer].SetCovRef(cov);
41702fec 1318 tracklets[iLayer].SetChi2(chi2track);
1319 }
1320
a2fbb6ec 1321/* if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) >=5){
1322 TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
41702fec 1323 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
1324 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
1325 Double_t chi2z = CalculateChi2Z(tracklets, offset, slope, xref);
1326 cstreamer << "FitTiltedRieman0"
1327 << "EventNumber=" << eventNumber
1328 << "CandidateNumber=" << candidateNumber
1329 << "xref=" << xref
1330 << "Chi2Z=" << chi2z
1331 << "\n";
3a039a31 1332 }*/
41702fec 1333 return chi2track;
eb38ed55 1334}
1335
3b57a3f7 1336
9e333711 1337//____________________________________________________________________
6e4d4425 1338Double_t AliTRDtrackerV1::FitLine(const AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t err, Int_t np, AliTrackPoint *points)
9e333711 1339{
4d6aee34 1340 //
1341 // Fit track with a staight line
1342 // Fills an AliTrackPoint array with np points
1343 // Function should be used to refit tracks when no magnetic field was on
1344 //
9e333711 1345 AliTRDLeastSquare yfitter, zfitter;
4d6aee34 1346 AliTRDcluster *cl = NULL;
9e333711 1347
4d6aee34 1348 AliTRDseedV1 work[kNPlanes], *tracklet = NULL;
9e333711 1349 if(!tracklets){
1350 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1351 if(!(tracklet = track->GetTracklet(ipl))) continue;
1352 if(!tracklet->IsOK()) continue;
1353 new(&work[ipl]) AliTRDseedV1(*tracklet);
1354 }
1355 tracklets = &work[0];
1356 }
1357
1358 Double_t xref = CalculateReferenceX(tracklets);
1359 Double_t x, y, z, dx, ye, yr, tilt;
1360 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1361 if(!tracklets[ipl].IsOK()) continue;
1362 for(Int_t itb = 0; itb < fgNTimeBins; itb++){
1363 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1364 if (!tracklets[ipl].IsUsable(itb)) continue;
1365 x = cl->GetX();
1366 z = cl->GetZ();
1367 dx = x - xref;
1368 zfitter.AddPoint(&dx, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
1369 }
1370 }
1371 zfitter.Eval();
1372 Double_t z0 = zfitter.GetFunctionParameter(0);
1373 Double_t dzdx = zfitter.GetFunctionParameter(1);
1374 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1375 if(!tracklets[ipl].IsOK()) continue;
1376 for(Int_t itb = 0; itb < fgNTimeBins; itb++){
1377 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1378 if (!tracklets[ipl].IsUsable(itb)) continue;
1379 x = cl->GetX();
1380 y = cl->GetY();
1381 z = cl->GetZ();
1382 tilt = tracklets[ipl].GetTilt();
1383 dx = x - xref;
1384 yr = y + tilt*(z - z0 - dzdx*dx);
1385 // error definition changes for the different calls
1386 ye = tilt*TMath::Sqrt(cl->GetSigmaZ2());
1387 ye += err ? tracklets[ipl].GetSigmaY() : 0.2;
1388 yfitter.AddPoint(&dx, yr, ye);
1389 }
1390 }
1391 yfitter.Eval();
1392 Double_t y0 = yfitter.GetFunctionParameter(0);
1393 Double_t dydx = yfitter.GetFunctionParameter(1);
1394 Double_t chi2 = 0.;//yfitter.GetChisquare()/Double_t(nPoints);
1395
1396 //update track points array
1397 if(np && points){
1398 Float_t xyz[3];
1399 for(int ip=0; ip<np; ip++){
1400 points[ip].GetXYZ(xyz);
1401 xyz[1] = y0 + dydx * (xyz[0] - xref);
1402 xyz[2] = z0 + dzdx * (xyz[0] - xref);
1403 points[ip].SetXYZ(xyz);
1404 }
1405 }
1406 return chi2;
1407}
1408
1409
3b57a3f7 1410//_________________________________________________________________________
6e4d4425 1411Double_t AliTRDtrackerV1::FitRiemanTilt(const AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t sigError, Int_t np, AliTrackPoint *points)
3b57a3f7 1412{
0fa1a8ee 1413//
1414// Performs a Riemann fit taking tilting pad correction into account
1415//
1416// Paramters: - Array of tracklets (connected to the track candidate)
1417// - Flag selecting the error definition
1418// Output: - Chi2 values of the track (in Parameter list)
1419//
1420// The equations which has to be solved simultaneously are:
1421// BEGIN_LATEX
1422// R^{2} = (x-x_{0})^{2} + (y^{*}-y_{0})^{2}
1423// y^{*} = y - tg(h)(z - z_{t})
1424// z_{t} = z_{0}+dzdx*(x-x_{r})
1425// END_LATEX
1426// with (x, y, z) the coordinate of the cluster, (x_0, y_0, z_0) the coordinate of the center of the Riemann circle,
1427// R its radius, x_r a constant refrence radial position in the middle of the TRD stack and dzdx the slope of the
1428// track in the x-z plane. Using the following transformations
1429// BEGIN_LATEX
1430// t = 1 / (x^{2} + y^{2})
1431// u = 2 * x * t
1432// v = 2 * tan(h) * t
1433// w = 2 * tan(h) * (x - x_{r}) * t
1434// END_LATEX
1435// One gets the following linear equation
1436// BEGIN_LATEX
1437// a + b * u + c * t + d * v + e * w = 2 * (y + tg(h) * z) * t
1438// END_LATEX
1439// where the coefficients have the following meaning
1440// BEGIN_LATEX
1441// a = -1/y_{0}
1442// b = x_{0}/y_{0}
1443// c = (R^{2} -x_{0}^{2} - y_{0}^{2})/y_{0}
1444// d = z_{0}
1445// e = dz/dx
1446// END_LATEX
1447// The error calculation for the free term is thus
1448// BEGIN_LATEX
1449// #sigma = 2 * #sqrt{#sigma^{2}_{y} + (tilt corr ...) + tg^{2}(h) * #sigma^{2}_{z}} * t
1450// END_LATEX
1451//
1452// From this simple model one can compute chi^2 estimates and a rough approximation of pt from the curvature according
1453// to the formula:
1454// BEGIN_LATEX
1455// C = 1/R = a/(1 + b^{2} + c*a)
1456// END_LATEX
1457//
1458// Authors
1459// M.Ivanov <M.Ivanov@gsi.de>
1460// A.Bercuci <A.Bercuci@gsi.de>
1461// M.Fasel <M.Fasel@gsi.de>
1462
41702fec 1463 TLinearFitter *fitter = GetTiltedRiemanFitter();
1464 fitter->StoreData(kTRUE);
1465 fitter->ClearPoints();
1466 AliTRDLeastSquare zfitter;
4d6aee34 1467 AliTRDcluster *cl = NULL;
3b57a3f7 1468
4d6aee34 1469 AliTRDseedV1 work[kNPlanes], *tracklet = NULL;
3b57a3f7 1470 if(!tracklets){
1471 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1472 if(!(tracklet = track->GetTracklet(ipl))) continue;
1473 if(!tracklet->IsOK()) continue;
1474 new(&work[ipl]) AliTRDseedV1(*tracklet);
1475 }
1476 tracklets = &work[0];
1477 }
1478
41702fec 1479 Double_t xref = CalculateReferenceX(tracklets);
1480 Double_t x, y, z, t, tilt, dx, w, we;
1481 Double_t uvt[4];
1482 Int_t nPoints = 0;
1483 // Containers for Least-square fitter
1484 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1485 if(!tracklets[ipl].IsOK()) continue;
8d2bec9e 1486 for(Int_t itb = 0; itb < AliTRDseedV1::kNclusters; itb++){
41702fec 1487 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1488 if (!tracklets[ipl].IsUsable(itb)) continue;
1489 x = cl->GetX();
1490 y = cl->GetY();
1491 z = cl->GetZ();
1492 tilt = tracklets[ipl].GetTilt();
1493 dx = x - xref;
1494 // Transformation
1495 t = 1./(x*x + y*y);
1496 uvt[0] = 2. * x * t;
1497 uvt[1] = t;
1498 uvt[2] = 2. * tilt * t;
1499 uvt[3] = 2. * tilt * dx * t;
1500 w = 2. * (y + tilt*z) * t;
1501 // error definition changes for the different calls
1502 we = 2. * t;
f29f13a6 1503 we *= sigError ? TMath::Sqrt(cl->GetSigmaY2()) : 0.2;
41702fec 1504 fitter->AddPoint(uvt, w, we);
1505 zfitter.AddPoint(&x, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
1506 nPoints++;
1507 }
1508 }
aec26713 1509 if(fitter->Eval()) return 1.E10;
1510
41702fec 1511 Double_t z0 = fitter->GetParameter(3);
1512 Double_t dzdx = fitter->GetParameter(4);
3b57a3f7 1513
1514
1515 // Linear fitter - not possible to make boundaries
1516 // Do not accept non possible z and dzdx combinations
1517 Bool_t accept = kTRUE;
1518 Double_t zref = 0.0;
1519 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
1520 if(!tracklets[iLayer].IsOK()) continue;
1521 zref = z0 + dzdx * (tracklets[iLayer].GetX0() - xref);
e3cf3d02 1522 if (TMath::Abs(tracklets[iLayer].GetZfit(0) - zref) > tracklets[iLayer].GetPadLength() * 0.5 + 1.0)
3b57a3f7 1523 accept = kFALSE;
1524 }
1525 if (!accept) {
41702fec 1526 zfitter.Eval();
3b57a3f7 1527 Double_t dzmf = zfitter.GetFunctionParameter(1);
1528 Double_t zmf = zfitter.GetFunctionValue(&xref);
1529 fitter->FixParameter(3, zmf);
1530 fitter->FixParameter(4, dzmf);
e17f4785 1531 fitter->Eval();
3b57a3f7 1532 fitter->ReleaseParameter(3);
1533 fitter->ReleaseParameter(4);
1534 z0 = fitter->GetParameter(3); // = zmf ?
1535 dzdx = fitter->GetParameter(4); // = dzmf ?
1536 }
1537
1538 // Calculate Curvature
1539 Double_t a = fitter->GetParameter(0);
1540 Double_t b = fitter->GetParameter(1);
1541 Double_t c = fitter->GetParameter(2);
1542 Double_t y0 = 1. / a;
1543 Double_t x0 = -b * y0;
a015e406 1544 Double_t tmp = y0*y0 + x0*x0 - c*y0;
1545 if(tmp<=0.) return 1.E10;
4d6aee34 1546 Double_t radius = TMath::Sqrt(tmp);
1547 Double_t curvature = 1.0 + b*b - c*a;
1548 if (curvature > 0.0) curvature = a / TMath::Sqrt(curvature);
3b57a3f7 1549
1550 // Calculate chi2 of the fit
1551 Double_t chi2 = fitter->GetChisquare()/Double_t(nPoints);
1552
1553 // Update the tracklets
1554 if(!track){
1555 for(Int_t ip = 0; ip < kNPlanes; ip++) {
1556 x = tracklets[ip].GetX0();
4d6aee34 1557 tmp = radius*radius-(x-x0)*(x-x0);
a015e406 1558 if(tmp <= 0.) continue;
1559 tmp = TMath::Sqrt(tmp);
3b57a3f7 1560
1561 // y: R^2 = (x - x0)^2 + (y - y0)^2
1562 // => y = y0 +/- Sqrt(R^2 - (x - x0)^2)
1563 tracklets[ip].SetYref(0, y0 - (y0>0.?1.:-1)*tmp);
1564 // => dy/dx = (x - x0)/Sqrt(R^2 - (x - x0)^2)
1565 tracklets[ip].SetYref(1, (x - x0) / tmp);
1566 tracklets[ip].SetZref(0, z0 + dzdx * (x - xref));
1567 tracklets[ip].SetZref(1, dzdx);
4d6aee34 1568 tracklets[ip].SetC(curvature);
3b57a3f7 1569 tracklets[ip].SetChi2(chi2);
1570 }
1571 }
3b57a3f7 1572 //update track points array
1573 if(np && points){
1574 Float_t xyz[3];
1575 for(int ip=0; ip<np; ip++){
1576 points[ip].GetXYZ(xyz);
4d6aee34 1577 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 1578 xyz[2] = z0 + dzdx * (xyz[0] - xref);
1579 points[ip].SetXYZ(xyz);
1580 }
1581 }
1582
3b57a3f7 1583 return chi2;
1584}
1585
1586
1bf51039 1587//____________________________________________________________________
e17f4785 1588Double_t AliTRDtrackerV1::FitKalman(AliTRDtrackV1 *track, AliTRDseedV1 * const tracklets, Bool_t up, Int_t np, AliTrackPoint *points)
1bf51039 1589{
1590// Kalman filter implementation for the TRD.
1591// It returns the positions of the fit in the array "points"
1592//
1593// Author : A.Bercuci@gsi.de
1594
3cfaffa4 1595 // printf("Start track @ x[%f]\n", track->GetX());
1bf51039 1596
1597 //prepare marker points along the track
1598 Int_t ip = np ? 0 : 1;
1599 while(ip<np){
1600 if((up?-1:1) * (track->GetX() - points[ip].GetX()) > 0.) break;
1601 //printf("AliTRDtrackerV1::FitKalman() : Skip track marker x[%d] = %7.3f. Before track start ( %7.3f ).\n", ip, points[ip].GetX(), track->GetX());
1602 ip++;
1603 }
1604 //if(points) printf("First marker point @ x[%d] = %f\n", ip, points[ip].GetX());
1605
1606
4d6aee34 1607 AliTRDseedV1 tracklet, *ptrTracklet = NULL;
1bf51039 1608
1609 //Loop through the TRD planes
1610 for (Int_t jplane = 0; jplane < kNPlanes; jplane++) {
1611 // GET TRACKLET OR BUILT IT
1612 Int_t iplane = up ? jplane : kNPlanes - 1 - jplane;
1613 if(tracklets){
e17f4785 1614 if(!(ptrTracklet = &tracklets[iplane])) continue;
1bf51039 1615 }else{
1616 if(!(ptrTracklet = track->GetTracklet(iplane))){
4d6aee34 1617 /*AliTRDtrackerV1 *tracker = NULL;
a2fbb6ec 1618 if(!(tracker = dynamic_cast<AliTRDtrackerV1*>( AliTRDrecoParam:Tracker()))) continue;
1bf51039 1619 ptrTracklet = new(&tracklet) AliTRDseedV1(iplane);
1620 if(!tracker->MakeTracklet(ptrTracklet, track)) */
1621 continue;
1622 }
1623 }
1624 if(!ptrTracklet->IsOK()) continue;
1625
1626 Double_t x = ptrTracklet->GetX0();
1627
1628 while(ip < np){
1629 //don't do anything if next marker is after next update point.
1630 if((up?-1:1) * (points[ip].GetX() - x) - fgkMaxStep < 0) break;
1bf51039 1631 if(((up?-1:1) * (points[ip].GetX() - track->GetX()) < 0) && !PropagateToX(*track, points[ip].GetX(), fgkMaxStep)) return -1.;
1632
1633 Double_t xyz[3]; // should also get the covariance
3cfaffa4 1634 track->GetXYZ(xyz);
1635 track->Global2LocalPosition(xyz, track->GetAlpha());
1636 points[ip].SetXYZ(xyz[0], xyz[1], xyz[2]);
1bf51039 1637 ip++;
1638 }
3cfaffa4 1639 // printf("plane[%d] tracklet[%p] x[%f]\n", iplane, ptrTracklet, x);
1bf51039 1640
3cfaffa4 1641 // Propagate closer to the next update point
1bf51039 1642 if(((up?-1:1) * (x - track->GetX()) + fgkMaxStep < 0) && !PropagateToX(*track, x + (up?-1:1)*fgkMaxStep, fgkMaxStep)) return -1.;
1643
1644 if(!AdjustSector(track)) return -1;
1645 if(TMath::Abs(track->GetSnp()) > fgkMaxSnp) return -1;
1646
1647 //load tracklet to the tracker and the track
1648/* Int_t index;
1649 if((index = FindTracklet(ptrTracklet)) < 0){
1650 ptrTracklet = SetTracklet(&tracklet);
1651 index = fTracklets->GetEntriesFast()-1;
1652 }
1653 track->SetTracklet(ptrTracklet, index);*/
1654
1655
1656 // register tracklet to track with tracklet creation !!
1657 // PropagateBack : loaded tracklet to the tracker and update index
1658 // RefitInward : update index
1659 // MakeTrack : loaded tracklet to the tracker and update index
1660 if(!tracklets) track->SetTracklet(ptrTracklet, -1);
1661
1662
1663 //Calculate the mean material budget along the path inside the chamber
1664 Double_t xyz0[3]; track->GetXYZ(xyz0);
1665 Double_t alpha = track->GetAlpha();
1666 Double_t xyz1[3], y, z;
1667 if(!track->GetProlongation(x, y, z)) return -1;
1668 xyz1[0] = x * TMath::Cos(alpha) - y * TMath::Sin(alpha);
1669 xyz1[1] = +x * TMath::Sin(alpha) + y * TMath::Cos(alpha);
1670 xyz1[2] = z;
3cfaffa4 1671 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 1672 Double_t param[7];
3cfaffa4 1673 if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param) <=0.) break;
1bf51039 1674 Double_t xrho = param[0]*param[4]; // density*length
1675 Double_t xx0 = param[1]; // radiation length
1676
1677 //Propagate the track
1678 track->PropagateTo(x, xx0, xrho);
1679 if (!AdjustSector(track)) break;
1680
1681 //Update track
b72f4eaf 1682 Double_t cov[3]; ptrTracklet->GetCovAt(x, cov);
1683 Double_t p[2] = { ptrTracklet->GetY(), ptrTracklet->GetZ()};
1684 Double_t chi2 = ((AliExternalTrackParam*)track)->GetPredictedChi2(p, cov);
1685 if(chi2<1e+10) track->Update(p, cov, chi2);
1bf51039 1686 if(!up) continue;
1687
1688 //Reset material budget if 2 consecutive gold
1689 if(iplane>0 && track->GetTracklet(iplane-1) && ptrTracklet->GetN() + track->GetTracklet(iplane-1)->GetN() > 20) track->SetBudget(2, 0.);
1690 } // end planes loop
1691
1692 // extrapolation
1693 while(ip < np){
1694 if(((up?-1:1) * (points[ip].GetX() - track->GetX()) < 0) && !PropagateToX(*track, points[ip].GetX(), fgkMaxStep)) return -1.;
1695
1696 Double_t xyz[3]; // should also get the covariance
3cfaffa4 1697 track->GetXYZ(xyz);
1698 track->Global2LocalPosition(xyz, track->GetAlpha());
1699 points[ip].SetXYZ(xyz[0], xyz[1], xyz[2]);
1bf51039 1700 ip++;
1701 }
1702
1703 return track->GetChi2();
1704}
3b57a3f7 1705
eb38ed55 1706//_________________________________________________________________________
bb56afff 1707Float_t AliTRDtrackerV1::CalculateChi2Z(AliTRDseedV1 *tracklets, Double_t offset, Double_t slope, Double_t xref)
eb38ed55 1708{
41702fec 1709 //
1710 // Calculates the chi2-value of the track in z-Direction including tilting pad correction.
1711 // A linear dependence on the x-value serves as a model.
1712 // The parameters are related to the tilted Riemann fit.
1713 // Parameters: - Array of tracklets (AliTRDseedV1) related to the track candidate
1714 // - the offset for the reference x
1715 // - the slope
1716 // - the reference x position
1717 // Output: - The Chi2 value of the track in z-Direction
1718 //
1719 Float_t chi2Z = 0, nLayers = 0;
053767a4 1720 for (Int_t iLayer = 0; iLayer < AliTRDgeometry::kNlayer; iLayer++) {
41702fec 1721 if(!tracklets[iLayer].IsOK()) continue;
1722 Double_t z = offset + slope * (tracklets[iLayer].GetX0() - xref);
e3cf3d02 1723 chi2Z += TMath::Abs(tracklets[iLayer].GetZfit(0) - z);
41702fec 1724 nLayers++;
1725 }
1726 chi2Z /= TMath::Max((nLayers - 3.0),1.0);
1727 return chi2Z;
eb38ed55 1728}
1729
bccda319 1730//_____________________________________________________________________________
1731Int_t AliTRDtrackerV1::PropagateToX(AliTRDtrackV1 &t, Double_t xToGo, Double_t maxStep)
1732{
41702fec 1733 //
1734 // Starting from current X-position of track <t> this function
1735 // extrapolates the track up to radial position <xToGo>.
1736 // Returns 1 if track reaches the plane, and 0 otherwise
1737 //
bccda319 1738
41702fec 1739 const Double_t kEpsilon = 0.00001;
bccda319 1740
41702fec 1741 // Current track X-position
1742 Double_t xpos = t.GetX();
bccda319 1743
41702fec 1744 // Direction: inward or outward
1745 Double_t dir = (xpos < xToGo) ? 1.0 : -1.0;
bccda319 1746
41702fec 1747 while (((xToGo - xpos) * dir) > kEpsilon) {
bccda319 1748
41702fec 1749 Double_t xyz0[3];
1750 Double_t xyz1[3];
1751 Double_t param[7];
1752 Double_t x;
1753 Double_t y;
1754 Double_t z;
bccda319 1755
41702fec 1756 // The next step size
1757 Double_t step = dir * TMath::Min(TMath::Abs(xToGo-xpos),maxStep);
bccda319 1758
41702fec 1759 // Get the global position of the starting point
1760 t.GetXYZ(xyz0);
bccda319 1761
41702fec 1762 // X-position after next step
1763 x = xpos + step;
bccda319 1764
41702fec 1765 // Get local Y and Z at the X-position of the next step
3352b455 1766 if(t.GetProlongation(x,y,z)<0) return 0; // No prolongation possible
bccda319 1767
41702fec 1768 // The global position of the end point of this prolongation step
1769 xyz1[0] = x * TMath::Cos(t.GetAlpha()) - y * TMath::Sin(t.GetAlpha());
1770 xyz1[1] = +x * TMath::Sin(t.GetAlpha()) + y * TMath::Cos(t.GetAlpha());
1771 xyz1[2] = z;
bccda319 1772
41702fec 1773 // Calculate the mean material budget between start and
1774 // end point of this prolongation step
83dea92e 1775 if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param)<=0.) return 0;
bccda319 1776
41702fec 1777 // Propagate the track to the X-position after the next step
9c87a076 1778 if (!t.PropagateTo(x, param[1], param[0]*param[4])) return 0;
bccda319 1779
41702fec 1780 // Rotate the track if necessary
1781 AdjustSector(&t);
bccda319 1782
41702fec 1783 // New track X-position
1784 xpos = t.GetX();
bccda319 1785
41702fec 1786 }
bccda319 1787
41702fec 1788 return 1;
bccda319 1789
1790}
1791
eb38ed55 1792
1793//_____________________________________________________________________________
1794Int_t AliTRDtrackerV1::ReadClusters(TClonesArray* &array, TTree *clusterTree) const
1795{
41702fec 1796 //
1797 // Reads AliTRDclusters from the file.
1798 // The names of the cluster tree and branches
1799 // should match the ones used in AliTRDclusterizer::WriteClusters()
1800 //
1801
1802 Int_t nsize = Int_t(clusterTree->GetTotBytes() / (sizeof(AliTRDcluster)));
1803 TObjArray *clusterArray = new TObjArray(nsize+1000);
1804
1805 TBranch *branch = clusterTree->GetBranch("TRDcluster");
1806 if (!branch) {
1807 AliError("Can't get the branch !");
1808 return 1;
1809 }
1810 branch->SetAddress(&clusterArray);
1811
1812 if(!fClusters){
4d6aee34 1813 Float_t nclusters = fkReconstructor->GetRecoParam()->GetNClusters();
1814 if(fkReconstructor->IsHLT()) nclusters /= AliTRDgeometry::kNsector;
8ae98148 1815 array = new TClonesArray("AliTRDcluster", Int_t(nclusters));
41702fec 1816 array->SetOwner(kTRUE);
1817 }
1818
1819 // Loop through all entries in the tree
1820 Int_t nEntries = (Int_t) clusterTree->GetEntries();
1821 Int_t nbytes = 0;
1822 Int_t ncl = 0;
4d6aee34 1823 AliTRDcluster *c = NULL;
41702fec 1824 for (Int_t iEntry = 0; iEntry < nEntries; iEntry++) {
1825 // Import the tree
1826 nbytes += clusterTree->GetEvent(iEntry);
1827
1828 // Get the number of points in the detector
1829 Int_t nCluster = clusterArray->GetEntriesFast();
1830 for (Int_t iCluster = 0; iCluster < nCluster; iCluster++) {
1831 if(!(c = (AliTRDcluster *) clusterArray->UncheckedAt(iCluster))) continue;
41702fec 1832 new((*fClusters)[ncl++]) AliTRDcluster(*c);
1833 delete (clusterArray->RemoveAt(iCluster));
1834 }
1835
1836 }
1837 delete clusterArray;
1838
1839 return 0;
eb38ed55 1840}
1841
1842//_____________________________________________________________________________
1843Int_t AliTRDtrackerV1::LoadClusters(TTree *cTree)
1844{
41702fec 1845 //
66f6bfd9 1846 // Fills clusters into TRD tracking sectors
41702fec 1847 //
41702fec 1848
4d6aee34 1849 if(!fkReconstructor->IsWritingClusters()){
48f8adf3 1850 fClusters = AliTRDReconstructor::GetClusters();
1851 } else {
66f6bfd9 1852 if (ReadClusters(fClusters, cTree)) {
1853 AliError("Problem with reading the clusters !");
1854 return 1;
1855 }
1856 }
1857 SetClustersOwner();
1858
48f8adf3 1859 if(!fClusters || !fClusters->GetEntriesFast()){
66f6bfd9 1860 AliInfo("No TRD clusters");
41702fec 1861 return 1;
1862 }
66f6bfd9 1863
1864 //Int_t nin =
1865 BuildTrackingContainers();
1866
1867 //Int_t ncl = fClusters->GetEntriesFast();
1868 //AliInfo(Form("Clusters %d [%6.2f %% in the active volume]", ncl, 100.*float(nin)/ncl));
1869
1870 return 0;
1871}
1872
1873//_____________________________________________________________________________
4d6aee34 1874Int_t AliTRDtrackerV1::LoadClusters(TClonesArray * const clusters)
66f6bfd9 1875{
1876 //
1877 // Fills clusters into TRD tracking sectors
1878 // Function for use in the HLT
1879
1880 if(!clusters || !clusters->GetEntriesFast()){
1881 AliInfo("No TRD clusters");
41702fec 1882 return 1;
1883 }
1884
66f6bfd9 1885 fClusters = clusters;
1886 SetClustersOwner();
1887
1888 //Int_t nin =
1889 BuildTrackingContainers();
1890
1891 //Int_t ncl = fClusters->GetEntriesFast();
1892 //AliInfo(Form("Clusters %d [%6.2f %% in the active volume]", ncl, 100.*float(nin)/ncl));
1893
1894 return 0;
1895}
1896
1897
1898//____________________________________________________________________
1899Int_t AliTRDtrackerV1::BuildTrackingContainers()
1900{
1901// Building tracking containers for clusters
1902
1903 Int_t nin =0, icl = fClusters->GetEntriesFast();
41702fec 1904 while (icl--) {
1905 AliTRDcluster *c = (AliTRDcluster *) fClusters->UncheckedAt(icl);
1906 if(c->IsInChamber()) nin++;
1907 Int_t detector = c->GetDetector();
1908 Int_t sector = fGeom->GetSector(detector);
053767a4 1909 Int_t stack = fGeom->GetStack(detector);
1910 Int_t layer = fGeom->GetLayer(detector);
41702fec 1911
053767a4 1912 fTrSec[sector].GetChamber(stack, layer, kTRUE)->InsertCluster(c, icl);
41702fec 1913 }
b0a48c4d 1914
1915 const AliTRDCalDet *cal = AliTRDcalibDB::Instance()->GetT0Det();
053767a4 1916 for(int isector =0; isector<AliTRDgeometry::kNsector; isector++){
41702fec 1917 if(!fTrSec[isector].GetNChambers()) continue;
4d6aee34 1918 fTrSec[isector].Init(fkReconstructor, cal);
41702fec 1919 }
66f6bfd9 1920
1921 return nin;
eb38ed55 1922}
1923
1924
66f6bfd9 1925
0906e73e 1926//____________________________________________________________________
172b6f82 1927void AliTRDtrackerV1::UnloadClusters()
0906e73e 1928{
d4cf71ca 1929//
1930// Clears the arrays of clusters and tracks. Resets sectors and timebins
1931// If option "force" is also set the containers are also deleted. This is useful
1932// in case of HLT
1933
1934 if(fTracks){
1935 fTracks->Delete();
4d6aee34 1936 if(HasRemoveContainers()){delete fTracks; fTracks = NULL;}
d4cf71ca 1937 }
1938 if(fTracklets){
1939 fTracklets->Delete();
4d6aee34 1940 if(HasRemoveContainers()){delete fTracklets; fTracklets = NULL;}
d4cf71ca 1941 }
48f8adf3 1942 if(fClusters){
1943 if(IsClustersOwner()) fClusters->Delete();
1944
1945 // save clusters array in the reconstructor for further use.
4d6aee34 1946 if(!fkReconstructor->IsWritingClusters()){
48f8adf3 1947 AliTRDReconstructor::SetClusters(fClusters);
1948 SetClustersOwner(kFALSE);
4d6aee34 1949 } else AliTRDReconstructor::SetClusters(NULL);
48f8adf3 1950 }
0906e73e 1951
053767a4 1952 for (int i = 0; i < AliTRDgeometry::kNsector; i++) fTrSec[i].Clear();
0906e73e 1953
41702fec 1954 // Increment the Event Number
1955 AliTRDtrackerDebug::SetEventNumber(AliTRDtrackerDebug::GetEventNumber() + 1);
eb38ed55 1956}
0906e73e 1957
fac58f00 1958// //____________________________________________________________________
1959// void AliTRDtrackerV1::UseClusters(const AliKalmanTrack *t, Int_t) const
1960// {
1961// const AliTRDtrackV1 *track = dynamic_cast<const AliTRDtrackV1*>(t);
1962// if(!track) return;
1963//
4d6aee34 1964// AliTRDseedV1 *tracklet = NULL;
fac58f00 1965// for(Int_t ily=AliTRDgeometry::kNlayer; ily--;){
1966// if(!(tracklet = track->GetTracklet(ily))) continue;
4d6aee34 1967// AliTRDcluster *c = NULL;
8d2bec9e 1968// for(Int_t ic=AliTRDseed::kNclusters; ic--;){
fac58f00 1969// if(!(c=tracklet->GetClusters(ic))) continue;
1970// c->Use();
1971// }
1972// }
1973// }
1974//
b1957d3c 1975
eb38ed55 1976//_____________________________________________________________________________
4d6aee34 1977Bool_t AliTRDtrackerV1::AdjustSector(AliTRDtrackV1 *const track)
eb38ed55 1978{
41702fec 1979 //
1980 // Rotates the track when necessary
1981 //
1982
1983 Double_t alpha = AliTRDgeometry::GetAlpha();
1984 Double_t y = track->GetY();
1985 Double_t ymax = track->GetX()*TMath::Tan(0.5*alpha);
3cfaffa4 1986
41702fec 1987 if (y > ymax) {
1988 if (!track->Rotate( alpha)) {
1989 return kFALSE;
1990 }
1991 }
1992 else if (y < -ymax) {
1993 if (!track->Rotate(-alpha)) {
1994 return kFALSE;
1995 }
1996 }
1997
1998 return kTRUE;
0906e73e 1999
2000}
2001
eb38ed55 2002
0906e73e 2003//____________________________________________________________________
4d6aee34 2004AliTRDseedV1* AliTRDtrackerV1::GetTracklet(AliTRDtrackV1 *const track, Int_t p, Int_t &idx)
0906e73e 2005{
41702fec 2006 // Find tracklet for TRD track <track>
2007 // Parameters
2008 // - track
2009 // - sector
2010 // - plane
2011 // - index
2012 // Output
2013 // tracklet
2014 // index
2015 // Detailed description
2016 //
2017 idx = track->GetTrackletIndex(p);
4d6aee34 2018 AliTRDseedV1 *tracklet = (idx==0xffff) ? NULL : (AliTRDseedV1*)fTracklets->UncheckedAt(idx);
41702fec 2019
2020 return tracklet;
0906e73e 2021}
2022
2023//____________________________________________________________________
4d6aee34 2024AliTRDseedV1* AliTRDtrackerV1::SetTracklet(const AliTRDseedV1 * const tracklet)
0906e73e 2025{
41702fec 2026 // Add this tracklet to the list of tracklets stored in the tracker
2027 //
2028 // Parameters
2029 // - tracklet : pointer to the tracklet to be added to the list
2030 //
2031 // Output
2032 // - the index of the new tracklet in the tracker tracklets list
2033 //
2034 // Detailed description
2035 // Build the tracklets list if it is not yet created (late initialization)
2036 // and adds the new tracklet to the list.
2037 //
2038 if(!fTracklets){
053767a4 2039 fTracklets = new TClonesArray("AliTRDseedV1", AliTRDgeometry::Nsector()*kMaxTracksStack);
41702fec 2040 fTracklets->SetOwner(kTRUE);
2041 }
2042 Int_t nentries = fTracklets->GetEntriesFast();
2043 return new ((*fTracklets)[nentries]) AliTRDseedV1(*tracklet);
972ef65e 2044}
2045
d20df6fc 2046//____________________________________________________________________
4d6aee34 2047AliTRDtrackV1* AliTRDtrackerV1::SetTrack(const AliTRDtrackV1 * const track)
d20df6fc 2048{
2049 // Add this track to the list of tracks stored in the tracker
2050 //
2051 // Parameters
2052 // - track : pointer to the track to be added to the list
2053 //
2054 // Output
2055 // - the pointer added
2056 //
2057 // Detailed description
2058 // Build the tracks list if it is not yet created (late initialization)
2059 // and adds the new track to the list.
2060 //
2061 if(!fTracks){
053767a4 2062 fTracks = new TClonesArray("AliTRDtrackV1", AliTRDgeometry::Nsector()*kMaxTracksStack);
d20df6fc 2063 fTracks->SetOwner(kTRUE);
2064 }
2065 Int_t nentries = fTracks->GetEntriesFast();
2066 return new ((*fTracks)[nentries]) AliTRDtrackV1(*track);
2067}
2068
2069
0906e73e 2070
e4f2f73d 2071//____________________________________________________________________
eb38ed55 2072Int_t AliTRDtrackerV1::Clusters2TracksSM(Int_t sector, AliESDEvent *esd)
e4f2f73d 2073{
41702fec 2074 //
2075 // Steer tracking for one SM.
2076 //
2077 // Parameters :
2078 // sector : Array of (SM) propagation layers containing clusters
2079 // esd : The current ESD event. On output it contains the also
2080 // the ESD (TRD) tracks found in this SM.
2081 //
2082 // Output :
2083 // Number of tracks found in this TRD supermodule.
2084 //
2085 // Detailed description
2086 //
2087 // 1. Unpack AliTRDpropagationLayers objects for each stack.
2088 // 2. Launch stack tracking.
2089 // See AliTRDtrackerV1::Clusters2TracksStack() for details.
2090 // 3. Pack results in the ESD event.
2091 //
2092
2093 // allocate space for esd tracks in this SM
2094 TClonesArray esdTrackList("AliESDtrack", 2*kMaxTracksStack);
2095 esdTrackList.SetOwner();
2096
2097 Int_t nTracks = 0;
2098 Int_t nChambers = 0;
4d6aee34 2099 AliTRDtrackingChamber **stack = NULL, *chamber = NULL;
053767a4 2100 for(int istack = 0; istack<AliTRDgeometry::kNstack; istack++){
41702fec 2101 if(!(stack = fTrSec[sector].GetStack(istack))) continue;
2102 nChambers = 0;
053767a4 2103 for(int ilayer=0; ilayer<AliTRDgeometry::kNlayer; ilayer++){
2104 if(!(chamber = stack[ilayer])) continue;
4d6aee34 2105 if(chamber->GetNClusters() < fgNTimeBins * fkReconstructor->GetRecoParam() ->GetFindableClusters()) continue;
41702fec 2106 nChambers++;
053767a4 2107 //AliInfo(Form("sector %d stack %d layer %d clusters %d", sector, istack, ilayer, chamber->GetNClusters()));
41702fec 2108 }
2109 if(nChambers < 4) continue;
2110 //AliInfo(Form("Doing stack %d", istack));
2111 nTracks += Clusters2TracksStack(stack, &esdTrackList);
2112 }
2113 //AliInfo(Form("Found %d tracks in SM %d [%d]\n", nTracks, sector, esd->GetNumberOfTracks()));
2114
2115 for(int itrack=0; itrack<nTracks; itrack++)
2116 esd->AddTrack((AliESDtrack*)esdTrackList[itrack]);
2117
2118 // Reset Track and Candidate Number
2119 AliTRDtrackerDebug::SetCandidateNumber(0);
2120 AliTRDtrackerDebug::SetTrackNumber(0);
2121 return nTracks;
e4f2f73d 2122}
2123
2124//____________________________________________________________________
4d6aee34 2125Int_t AliTRDtrackerV1::Clusters2TracksStack(AliTRDtrackingChamber **stack, TClonesArray * const esdTrackList)
e4f2f73d 2126{
41702fec 2127 //
2128 // Make tracks in one TRD stack.
2129 //
2130 // Parameters :
2131 // layer : Array of stack propagation layers containing clusters
2132 // esdTrackList : Array of ESD tracks found by the stand alone tracker.
2133 // On exit the tracks found in this stack are appended.
2134 //
2135 // Output :
2136 // Number of tracks found in this stack.
2137 //
2138 // Detailed description
2139 //
2140 // 1. Find the 3 most useful seeding chambers. See BuildSeedingConfigs() for details.
2141 // 2. Steer AliTRDtrackerV1::MakeSeeds() for 3 seeding layer configurations.
2142 // See AliTRDtrackerV1::MakeSeeds() for more details.
2143 // 3. Arrange track candidates in decreasing order of their quality
2144 // 4. Classify tracks in 5 categories according to:
2145 // a) number of layers crossed
2146 // b) track quality
2147 // 5. Sign clusters by tracks in decreasing order of track quality
2148 // 6. Build AliTRDtrack out of seeding tracklets
2149 // 7. Cook MC label
2150 // 8. Build ESD track and register it to the output list
2151 //
2152
b0a48c4d 2153 const AliTRDCalDet *cal = AliTRDcalibDB::Instance()->GetT0Det();
4d6aee34 2154 AliTRDtrackingChamber *chamber = NULL;
2155 AliTRDtrackingChamber **ci = NULL;
41702fec 2156 AliTRDseedV1 sseed[kMaxTracksStack*6]; // to be initialized
2157 Int_t pars[4]; // MakeSeeds parameters
2158
2159 //Double_t alpha = AliTRDgeometry::GetAlpha();
2160 //Double_t shift = .5 * alpha;
2161 Int_t configs[kNConfigs];
2162
fac58f00 2163 // Purge used clusters from the containers
2164 ci = &stack[0];
2165 for(Int_t ic = kNPlanes; ic--; ci++){
2166 if(!(*ci)) continue;
2167 (*ci)->Update();
2168 }
2169
41702fec 2170 // Build initial seeding configurations
2171 Double_t quality = BuildSeedingConfigs(stack, configs);
a2fbb6ec 2172 if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) > 10){
41702fec 2173 AliInfo(Form("Plane config %d %d %d Quality %f"
2174 , configs[0], configs[1], configs[2], quality));
2175 }
d931f2aa 2176
41702fec 2177
2178 // Initialize contors
2179 Int_t ntracks, // number of TRD track candidates
2180 ntracks1, // number of registered TRD tracks/iter
2181 ntracks2 = 0; // number of all registered TRD tracks in stack
2182 fSieveSeeding = 0;
d931f2aa 2183
2184 // Get stack index
fac58f00 2185 Int_t ic = 0; ci = &stack[0];
2186 while(ic<kNPlanes && !(*ci)){ic++; ci++;}
2187 if(!(*ci)) return ntracks2;
2188 Int_t istack = fGeom->GetStack((*ci)->GetDetector());
d931f2aa 2189
41702fec 2190 do{
2191 // Loop over seeding configurations
2192 ntracks = 0; ntracks1 = 0;
2193 for (Int_t iconf = 0; iconf<3; iconf++) {
2194 pars[0] = configs[iconf];
2195 pars[1] = ntracks;
d931f2aa 2196 pars[2] = istack;
41702fec 2197 ntracks = MakeSeeds(stack, &sseed[6*ntracks], pars);
6e39bde4 2198 //AliInfo(Form("Number of Tracks after iteration step %d: %d\n", iconf, ntracks));
41702fec 2199 if(ntracks == kMaxTracksStack) break;
2200 }
a2fbb6ec 2201 if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) > 1) AliInfo(Form("Candidate TRD tracks %d in iteration %d.", ntracks, fSieveSeeding));
41702fec 2202
2203 if(!ntracks) break;
2204
2205 // Sort the seeds according to their quality
2206 Int_t sort[kMaxTracksStack];
2207 TMath::Sort(ntracks, fTrackQuality, sort, kTRUE);
2208
2209 // Initialize number of tracks so far and logic switches
2210 Int_t ntracks0 = esdTrackList->GetEntriesFast();
2211 Bool_t signedTrack[kMaxTracksStack];
2212 Bool_t fakeTrack[kMaxTracksStack];
2213 for (Int_t i=0; i<ntracks; i++){
2214 signedTrack[i] = kFALSE;
2215 fakeTrack[i] = kFALSE;
2216 }
2217 //AliInfo("Selecting track candidates ...");
2218
2219 // Sieve clusters in decreasing order of track quality
2220 Double_t trackParams[7];
4d6aee34 2221 // AliTRDseedV1 *lseed = NULL;
41702fec 2222 Int_t jSieve = 0, candidates;
2223 do{
2224 //AliInfo(Form("\t\tITER = %i ", jSieve));
2225
2226 // Check track candidates
2227 candidates = 0;
2228 for (Int_t itrack = 0; itrack < ntracks; itrack++) {
804bb02e 2229 Int_t trackIndex = sort[itrack];
2230 if (signedTrack[trackIndex] || fakeTrack[trackIndex]) continue;
41702fec 2231
2232
804bb02e 2233 // Calculate track parameters from tracklets seeds
804bb02e 2234 Int_t ncl = 0;
2235 Int_t nused = 0;
2236 Int_t nlayers = 0;
2237 Int_t findable = 0;
2238 for (Int_t jLayer = 0; jLayer < kNPlanes; jLayer++) {
2239 Int_t jseed = kNPlanes*trackIndex+jLayer;
2240 if(!sseed[jseed].IsOK()) continue;
f29f13a6 2241 if (TMath::Abs(sseed[jseed].GetYref(0) / sseed[jseed].GetX0()) < 0.158) findable++;
eede7907 2242 // TODO here we get a sig fault which should never happen !
804bb02e 2243 sseed[jseed].UpdateUsed();
2244 ncl += sseed[jseed].GetN2();
2245 nused += sseed[jseed].GetNUsed();
2246 nlayers++;
804bb02e 2247 }
2248
f29f13a6 2249 // Filter duplicated tracks
2250 if (nused > 30){
2251 //printf("Skip %d nused %d\n", trackIndex, nused);
2252 fakeTrack[trackIndex] = kTRUE;
2253 continue;
2254 }
2255 if (Float_t(nused)/ncl >= .25){
2256 //printf("Skip %d nused/ncl >= .25\n", trackIndex);
2257 fakeTrack[trackIndex] = kTRUE;
2258 continue;
2259 }
41702fec 2260
f29f13a6 2261 // Classify tracks
2262 Bool_t skip = kFALSE;
2263 switch(jSieve){
2264 case 0:
2265 if(nlayers < 6) {skip = kTRUE; break;}
2266 if(TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -5.){skip = kTRUE; break;}
2267 break;
2268
2269 case 1:
2270 if(nlayers < findable){skip = kTRUE; break;}
2271 if(TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -4.){skip = kTRUE; break;}
2272 break;
2273
2274 case 2:
2275 if ((nlayers == findable) || (nlayers == 6)) { skip = kTRUE; break;}
2276 if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -6.0){skip = kTRUE; break;}
2277 break;
2278
2279 case 3:
2280 if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -5.){skip = kTRUE; break;}
2281 break;
2282
2283 case 4:
2284 if (nlayers == 3){skip = kTRUE; break;}
2285 //if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) - nused/(nlayers-3.0) < -15.0){skip = kTRUE; break;}
2286 break;
2287 }
2288 if(skip){
2289 candidates++;
2290 //printf("REJECTED : %d [%d] nlayers %d trackQuality = %e nused %d\n", itrack, trackIndex, nlayers, fTrackQuality[trackIndex], nused);
2291 continue;
2292 }
2293 signedTrack[trackIndex] = kTRUE;
2294
2295 // Build track parameters
2296 AliTRDseedV1 *lseed =&sseed[trackIndex*6];
2297 /* Int_t idx = 0;
2298 while(idx<3 && !lseed->IsOK()) {
2299 idx++;
2300 lseed++;
2301 }*/
2302 Double_t x = lseed->GetX0();// - 3.5;
2303 trackParams[0] = x; //NEW AB
2304 trackParams[1] = lseed->GetYref(0); // lseed->GetYat(x);
2305 trackParams[2] = lseed->GetZref(0); // lseed->GetZat(x);
2306 trackParams[3] = TMath::Sin(TMath::ATan(lseed->GetYref(1)));
2307 trackParams[4] = lseed->GetZref(1) / TMath::Sqrt(1. + lseed->GetYref(1) * lseed->GetYref(1));
2308 trackParams[5] = lseed->GetC();
2309 Int_t ich = 0; while(!(chamber = stack[ich])) ich++;
2310 trackParams[6] = fGeom->GetSector(chamber->GetDetector());/* *alpha+shift; // Supermodule*/
2311
a2fbb6ec 2312 if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) > 1 && fkReconstructor->IsDebugStreaming()){
eb2b4f91 2313 //AliInfo(Form("Track %d [%d] nlayers %d trackQuality = %e nused %d, yref = %3.3f", itrack, trackIndex, nlayers, fTrackQuality[trackIndex], nused, trackParams[1]));
f29f13a6 2314
f29f13a6 2315 AliTRDseedV1 *dseed[6];
b82b4de1 2316 for(Int_t iseed = AliTRDgeometry::kNlayer; iseed--;) dseed[iseed] = new AliTRDseedV1(lseed[iseed]);
f29f13a6 2317
2318 //Int_t eventNrInFile = esd->GetEventNumberInFile();
f29f13a6 2319 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2320 Int_t trackNumber = AliTRDtrackerDebug::GetTrackNumber();
2321 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
a2fbb6ec 2322 TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
f29f13a6 2323 cstreamer << "Clusters2TracksStack"
2324 << "EventNumber=" << eventNumber
2325 << "TrackNumber=" << trackNumber
2326 << "CandidateNumber=" << candidateNumber
2327 << "Iter=" << fSieveSeeding
2328 << "Like=" << fTrackQuality[trackIndex]
2329 << "S0.=" << dseed[0]
2330 << "S1.=" << dseed[1]
2331 << "S2.=" << dseed[2]
2332 << "S3.=" << dseed[3]
2333 << "S4.=" << dseed[4]
2334 << "S5.=" << dseed[5]
2335 << "p0=" << trackParams[0]
2336 << "p1=" << trackParams[1]
2337 << "p2=" << trackParams[2]
2338 << "p3=" << trackParams[3]
2339 << "p4=" << trackParams[4]
2340 << "p5=" << trackParams[5]
2341 << "p6=" << trackParams[6]
f29f13a6 2342 << "Ncl=" << ncl
2343 << "NLayers=" << nlayers
2344 << "Findable=" << findable
2345 << "NUsed=" << nused
2346 << "\n";
2347 }
d877f55f 2348
f29f13a6 2349 AliTRDtrackV1 *track = MakeTrack(&sseed[trackIndex*kNPlanes], trackParams);
2350 if(!track){
2351 AliWarning("Fail to build a TRD Track.");
2352 continue;
d877f55f 2353 }
41702fec 2354
f29f13a6 2355 //AliInfo("End of MakeTrack()");
2356 AliESDtrack *esdTrack = new ((*esdTrackList)[ntracks0++]) AliESDtrack();
2357 esdTrack->UpdateTrackParams(track, AliESDtrack::kTRDout);
2358 esdTrack->SetLabel(track->GetLabel());
2359 track->UpdateESDtrack(esdTrack);
2360 // write ESD-friends if neccessary
a2fbb6ec 2361 if (fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) > 0){
f29f13a6 2362 AliTRDtrackV1 *calibTrack = new AliTRDtrackV1(*track);
2363 calibTrack->SetOwner();
2364 esdTrack->AddCalibObject(calibTrack);
2365 }
2366 ntracks1++;
2367 AliTRDtrackerDebug::SetTrackNumber(AliTRDtrackerDebug::GetTrackNumber() + 1);
41702fec 2368 }
2369
2370 jSieve++;
2371 } while(jSieve<5 && candidates); // end track candidates sieve
2372 if(!ntracks1) break;
2373
2374 // increment counters
2375 ntracks2 += ntracks1;
4302c900 2376
4d6aee34 2377 if(fkReconstructor->IsHLT()) break;
41702fec 2378 fSieveSeeding++;
2379
2380 // Rebuild plane configurations and indices taking only unused clusters into account
2381 quality = BuildSeedingConfigs(stack, configs);
4d6aee34 2382 if(quality < 1.E-7) break; //fkReconstructor->GetRecoParam() ->GetPlaneQualityThreshold()) break;
41702fec 2383
2384 for(Int_t ip = 0; ip < kNPlanes; ip++){
2385 if(!(chamber = stack[ip])) continue;
b0a48c4d 2386 chamber->Build(fGeom, cal);//Indices(fSieveSeeding);
41702fec 2387 }
2388
a2fbb6ec 2389 if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) > 10){
41702fec 2390 AliInfo(Form("Sieve level %d Plane config %d %d %d Quality %f", fSieveSeeding, configs[0], configs[1], configs[2], quality));
2391 }
2392 } while(fSieveSeeding<10); // end stack clusters sieve
2393
2394
2395
2396 //AliInfo(Form("Registered TRD tracks %d in stack %d.", ntracks2, pars[1]));
2397
2398 return ntracks2;
e4f2f73d 2399}
2400
2401//___________________________________________________________________
eb38ed55 2402Double_t AliTRDtrackerV1::BuildSeedingConfigs(AliTRDtrackingChamber **stack, Int_t *configs)
e4f2f73d 2403{
41702fec 2404 //
2405 // Assign probabilities to chambers according to their
2406 // capability of producing seeds.
2407 //
2408 // Parameters :
2409 //
2410 // layers : Array of stack propagation layers for all 6 chambers in one stack
2411 // configs : On exit array of configuration indexes (see GetSeedingConfig()
2412 // for details) in the decreasing order of their seeding probabilities.
2413 //
2414 // Output :
2415 //
2416 // Return top configuration quality
2417 //
2418 // Detailed description:
2419 //
2420 // To each chamber seeding configuration (see GetSeedingConfig() for
2421 // the list of all configurations) one defines 2 quality factors:
2422 // - an apriori topological quality (see GetSeedingConfig() for details) and
2423 // - a data quality based on the uniformity of the distribution of
2424 // clusters over the x range (time bins population). See CookChamberQA() for details.
2425 // The overall chamber quality is given by the product of this 2 contributions.
2426 //
2427
eb2b4f91 2428 Double_t chamberQ[kNPlanes];memset(chamberQ, 0, kNPlanes*sizeof(Double_t));
4d6aee34 2429 AliTRDtrackingChamber *chamber = NULL;
41702fec 2430 for(int iplane=0; iplane<kNPlanes; iplane++){
2431 if(!(chamber = stack[iplane])) continue;
2432 chamberQ[iplane] = (chamber = stack[iplane]) ? chamber->GetQuality() : 0.;
2433 }
2434
eb2b4f91 2435 Double_t tconfig[kNConfigs];memset(tconfig, 0, kNConfigs*sizeof(Double_t));
2436 Int_t planes[] = {0, 0, 0, 0};
41702fec 2437 for(int iconf=0; iconf<kNConfigs; iconf++){
2438 GetSeedingConfig(iconf, planes);
2439 tconfig[iconf] = fgTopologicQA[iconf];
2440 for(int iplane=0; iplane<4; iplane++) tconfig[iconf] *= chamberQ[planes[iplane]];
2441 }
2442
2443 TMath::Sort((Int_t)kNConfigs, tconfig, configs, kTRUE);
2444 // AliInfo(Form("q[%d] = %f", configs[0], tconfig[configs[0]]));
2445 // AliInfo(Form("q[%d] = %f", configs[1], tconfig[configs[1]]));
2446 // AliInfo(Form("q[%d] = %f", configs[2], tconfig[configs[2]]));
2447
2448 return tconfig[configs[0]];
e4f2f73d 2449}
2450
2451//____________________________________________________________________
e17f4785 2452Int_t AliTRDtrackerV1::MakeSeeds(AliTRDtrackingChamber **stack, AliTRDseedV1 * const sseed, const Int_t * const ipar)
e4f2f73d 2453{
afa21247 2454//
2a3191bb 2455// Seed tracklets and build candidate TRD tracks. The procedure is used during barrel tracking to account for tracks which are
2456// either missed by TPC prolongation or conversions inside the TRD volume.
2457// For stand alone tracking the procedure is used to estimate all tracks measured by TRD.
afa21247 2458//
2459// Parameters :
2460// layers : Array of stack propagation layers containing clusters
2461// sseed : Array of empty tracklet seeds. On exit they are filled.
2462// ipar : Control parameters:
2463// ipar[0] -> seeding chambers configuration
2464// ipar[1] -> stack index
2465// ipar[2] -> number of track candidates found so far
2466//
2467// Output :
2468// Number of tracks candidates found.
2469//
2470// The following steps are performed:
2471// 1. Build seeding layers by collapsing all time bins from each of the four seeding chambers along the
2472// radial coordinate. See AliTRDtrackingChamber::GetSeedingLayer() for details. The chambers selection for seeding
2473// is described in AliTRDtrackerV1::Clusters2TracksStack().
2474// 2. Using the seeding clusters from the seeding layer (step 1) build combinatorics using the following algorithm:
2475// - for each seeding cluster in the lower seeding layer find
2476// - all seeding clusters in the upper seeding layer inside a road defined by a given phi angle. The angle
2477// is calculated on the minimum pt of tracks from vertex accesible to the stand alone tracker.
2478// - for each pair of two extreme seeding clusters select middle upper cluster using roads defined externally by the
2479// reco params
2480// - select last seeding cluster as the nearest to the linear approximation of the track described by the first three
2481// seeding clusters.
2482// The implementation of road calculation and cluster selection can be found in the functions AliTRDchamberTimeBin::BuildCond()
2483// and AliTRDchamberTimeBin::GetClusters().
2484// 3. Helix fit of the seeding clusters set. (see AliTRDtrackerFitter::FitRieman(AliTRDcluster**)). No tilt correction is
2485// performed at this level
2486// 4. Initialize seeding tracklets in the seeding chambers.
2487// 5. *Filter 0* Chi2 cut on the Y and Z directions. The threshold is set externally by the reco params.
2488// 6. Attach (true) clusters to seeding tracklets (see AliTRDseedV1::AttachClusters()) and fit tracklet (see
2489// AliTRDseedV1::Fit()). The number of used clusters used by current seeds should not exceed ... (25).
2490// 7. *Filter 1* Check if all 4 seeding tracklets are correctly constructed.
2491// 8. Helix fit of the clusters from the seeding tracklets with tilt correction. Refit tracklets using the new
2492// approximation of the track.
2493// 9. *Filter 2* Calculate likelihood of the track. (See AliTRDtrackerV1::CookLikelihood()). The following quantities are
2494// checked against the Riemann fit:
2495// - position resolution in y
2496// - angular resolution in the bending plane
2497// - likelihood of the number of clusters attached to the tracklet
2498// 10. Extrapolation of the helix fit to the other 2 chambers *non seeding* chambers:
2499// - Initialization of extrapolation tracklets with the fit parameters
2500// - Attach clusters to extrapolated tracklets
2501// - Helix fit of tracklets
2502// 11. Improve seeding tracklets quality by reassigning clusters based on the last parameters of the track
2503// See AliTRDtrackerV1::ImproveSeedQuality() for details.
2504// 12. Helix fit of all 6 seeding tracklets and chi2 calculation
2505// 13. Hyperplane fit and track quality calculation. See AliTRDtrackerFitter::FitHyperplane() for details.
2506// 14. Cooking labels for tracklets. Should be done only for MC
2507// 15. Register seeds.
2508//
2509// Authors:
2510// Marian Ivanov <M.Ivanov@gsi.de>
2511// Alexandru Bercuci <A.Bercuci@gsi.de>
2512// Markus Fasel <M.Fasel@gsi.de>
41702fec 2513
4d6aee34 2514 AliTRDtrackingChamber *chamber = NULL;
2515 AliTRDcluster *c[kNSeedPlanes] = {NULL, NULL, NULL, NULL}; // initilize seeding clusters
e17f4785 2516 AliTRDseedV1 *cseed = &sseed[0]; // initialize tracklets for first track
41702fec 2517 Int_t ncl, mcl; // working variable for looping over clusters
2518 Int_t index[AliTRDchamberTimeBin::kMaxClustersLayer], jndex[AliTRDchamberTimeBin::kMaxClustersLayer];
2519 // chi2 storage
2520 // chi2[0] = tracklet chi2 on the Z direction
2521 // chi2[1] = tracklet chi2 on the R direction
2522 Double_t chi2[4];
2523
afa21247 2524 // this should be data member of AliTRDtrack TODO
41702fec 2525 Double_t seedQuality[kMaxTracksStack];
2526
2527 // unpack control parameters
2528 Int_t config = ipar[0];
2529 Int_t ntracks = ipar[1];
d931f2aa 2530 Int_t istack = ipar[2];
41702fec 2531 Int_t planes[kNSeedPlanes]; GetSeedingConfig(config, planes);
afa21247 2532 Int_t planesExt[kNPlanes-kNSeedPlanes]; GetExtrapolationConfig(config, planesExt);
be24510a 2533
2534
41702fec 2535 // Init chambers geometry
41702fec 2536 Double_t hL[kNPlanes]; // Tilting angle
2537 Float_t padlength[kNPlanes]; // pad lenghts
dd8059a8 2538 Float_t padwidth[kNPlanes]; // pad widths
4d6aee34 2539 AliTRDpadPlane *pp = NULL;
41702fec 2540 for(int iplane=0; iplane<kNPlanes; iplane++){
2541 pp = fGeom->GetPadPlane(iplane, istack);
bb79ccd5 2542 hL[iplane] = TMath::Tan(TMath::DegToRad()*pp->GetTiltingAngle());
41702fec 2543 padlength[iplane] = pp->GetLengthIPad();
dd8059a8 2544 padwidth[iplane] = pp->GetWidthIPad();
41702fec 2545 }
2546
eb2b4f91 2547 // Init anode wire position for chambers
e165b64b 2548 Double_t x0[kNPlanes], // anode wire position
eb2b4f91 2549 driftLength = .5*AliTRDgeometry::AmThick() - AliTRDgeometry::DrThick(); // drift length
4d6aee34 2550 TGeoHMatrix *matrix = NULL;
eb2b4f91 2551 Double_t loc[] = {AliTRDgeometry::AnodePos(), 0., 0.};
2552 Double_t glb[] = {0., 0., 0.};
2553 AliTRDtrackingChamber **cIter = &stack[0];
a3743898 2554 for(int iLayer=0; iLayer<kNPlanes; iLayer++,cIter++){
eb2b4f91 2555 if(!(*cIter)) continue;
e165b64b 2556 if(!(matrix = fGeom->GetClusterMatrix((*cIter)->GetDetector()))){
2557 continue;
2558 x0[iLayer] = fgkX0[iLayer];
2559 }
eb2b4f91 2560 matrix->LocalToMaster(loc, glb);
2561 x0[iLayer] = glb[0];
2562 }
2563
a2fbb6ec 2564 if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) > 2){
41702fec 2565 AliInfo(Form("Making seeds Stack[%d] Config[%d] Tracks[%d]...", istack, config, ntracks));
2566 }
2567
d931f2aa 2568 // Build seeding layers
d611c74f 2569 ResetSeedTB();
41702fec 2570 Int_t nlayers = 0;
41702fec 2571 for(int isl=0; isl<kNSeedPlanes; isl++){
2572 if(!(chamber = stack[planes[isl]])) continue;
4d6aee34 2573 if(!chamber->GetSeedingLayer(fSeedTB[isl], fGeom, fkReconstructor)) continue;
41702fec 2574 nlayers++;
41702fec 2575 }
eb2b4f91 2576 if(nlayers < kNSeedPlanes) return ntracks;
41702fec 2577
2578
2579 // Start finding seeds
2580 Double_t cond0[4], cond1[4], cond2[4];
2581 Int_t icl = 0;
d611c74f 2582 while((c[3] = (*fSeedTB[3])[icl++])){
41702fec 2583 if(!c[3]) continue;
d611c74f 2584 fSeedTB[0]->BuildCond(c[3], cond0, 0);
2585 fSeedTB[0]->GetClusters(cond0, index, ncl);
41702fec 2586 //printf("Found c[3] candidates 0 %d\n", ncl);
2587 Int_t jcl = 0;
2588 while(jcl<ncl) {
d611c74f 2589 c[0] = (*fSeedTB[0])[index[jcl++]];
41702fec 2590 if(!c[0]) continue;
2591 Double_t dx = c[3]->GetX() - c[0]->GetX();
afa21247 2592 Double_t dzdx = (c[3]->GetZ() - c[0]->GetZ())/dx;
2593 Double_t dydx = (c[3]->GetY() - c[0]->GetY())/dx;
2594 fSeedTB[1]->BuildCond(c[0], cond1, 1, dzdx, dydx);
d611c74f 2595 fSeedTB[1]->GetClusters(cond1, jndex, mcl);
41702fec 2596 //printf("Found c[0] candidates 1 %d\n", mcl);
2597
2598 Int_t kcl = 0;
2599 while(kcl<mcl) {
d611c74f 2600 c[1] = (*fSeedTB[1])[jndex[kcl++]];
2601 if(!c[1]) continue;
afa21247 2602 fSeedTB[2]->BuildCond(c[1], cond2, 2, dzdx, dydx);
d611c74f 2603 c[2] = fSeedTB[2]->GetNearestCluster(cond2);
2604 //printf("Found c[1] candidate 2 %p\n", c[2]);
2605 if(!c[2]) continue;
2606
6e39bde4 2607 //AliInfo("Seeding clusters found. Building seeds ...");
2608 //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 2609
804bb02e 2610 for (Int_t il = 0; il < kNPlanes; il++) cseed[il].Reset();
41702fec 2611
d611c74f 2612 FitRieman(c, chi2);
2613
d931f2aa 2614 AliTRDseedV1 *tseed = &cseed[0];
bb2db46c 2615 cIter = &stack[0];
2616 for(int iLayer=0; iLayer<kNPlanes; iLayer++, tseed++, cIter++){
2617 Int_t det = (*cIter) ? (*cIter)->GetDetector() : -1;
eb2b4f91 2618 tseed->SetDetector(det);
43d6ad34 2619 tseed->SetTilt(hL[iLayer]);
2620 tseed->SetPadLength(padlength[iLayer]);
dd8059a8 2621 tseed->SetPadWidth(padwidth[iLayer]);
4d6aee34 2622 tseed->SetReconstructor(fkReconstructor);
eb2b4f91 2623 tseed->SetX0(det<0 ? fR[iLayer]+driftLength : x0[iLayer]);
d611c74f 2624 tseed->Init(GetRiemanFitter());
f29f13a6 2625 tseed->SetStandAlone(kTRUE);
d611c74f 2626 }
2627
2628 Bool_t isFake = kFALSE;
a2fbb6ec 2629 if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) >= 2 && fkReconstructor->IsDebugStreaming()){
d611c74f 2630 if (c[0]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
2631 if (c[1]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
2632 if (c[2]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
2633
2634 Double_t xpos[4];
2635 for(Int_t l = 0; l < kNSeedPlanes; l++) xpos[l] = fSeedTB[l]->GetX();
2636 Float_t yref[4];
2637 for(int il=0; il<4; il++) yref[il] = cseed[planes[il]].GetYref(0);
2638 Int_t ll = c[3]->GetLabel(0);
2639 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2640 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2641 AliRieman *rim = GetRiemanFitter();
a2fbb6ec 2642 TTreeSRedirector &cs0 = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
d611c74f 2643 cs0 << "MakeSeeds0"
2644 <<"EventNumber=" << eventNumber
2645 <<"CandidateNumber=" << candidateNumber
2646 <<"isFake=" << isFake
2647 <<"config=" << config
2648 <<"label=" << ll
2649 <<"chi2z=" << chi2[0]
2650 <<"chi2y=" << chi2[1]
2651 <<"Y2exp=" << cond2[0]
2652 <<"Z2exp=" << cond2[1]
2653 <<"X0=" << xpos[0] //layer[sLayer]->GetX()
2654 <<"X1=" << xpos[1] //layer[sLayer + 1]->GetX()
2655 <<"X2=" << xpos[2] //layer[sLayer + 2]->GetX()
2656 <<"X3=" << xpos[3] //layer[sLayer + 3]->GetX()
2657 <<"yref0=" << yref[0]
2658 <<"yref1=" << yref[1]
2659 <<"yref2=" << yref[2]
2660 <<"yref3=" << yref[3]
2661 <<"c0.=" << c[0]
2662 <<"c1.=" << c[1]
2663 <<"c2.=" << c[2]
2664 <<"c3.=" << c[3]
2665 <<"Seed0.=" << &cseed[planes[0]]
2666 <<"Seed1.=" << &cseed[planes[1]]
2667 <<"Seed2.=" << &cseed[planes[2]]
2668 <<"Seed3.=" << &cseed[planes[3]]
2669 <<"RiemanFitter.=" << rim
2670 <<"\n";
2671 }
4d6aee34 2672 if(chi2[0] > fkReconstructor->GetRecoParam() ->GetChi2Z()/*7./(3. - sLayer)*//*iter*/){
6e39bde4 2673 //AliInfo(Form("Failed chi2 filter on chi2Z [%f].", chi2[0]));
d611c74f 2674 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2675 continue;
2676 }
4d6aee34 2677 if(chi2[1] > fkReconstructor->GetRecoParam() ->GetChi2Y()/*1./(3. - sLayer)*//*iter*/){
6e39bde4 2678 //AliInfo(Form("Failed chi2 filter on chi2Y [%f].", chi2[1]));
d611c74f 2679 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2680 continue;
2681 }
2682 //AliInfo("Passed chi2 filter.");
2683
2684 // try attaching clusters to tracklets
6e39bde4 2685 Int_t mlayers = 0;
cfa15645 2686 AliTRDcluster *cl = NULL;
be24510a 2687 for(int iLayer=0; iLayer<kNSeedPlanes; iLayer++){
d611c74f 2688 Int_t jLayer = planes[iLayer];
cfa15645 2689 Int_t nNotInChamber = 0;
f29f13a6 2690 if(!cseed[jLayer].AttachClusters(stack[jLayer], kTRUE)) continue;
5f1ae1e7 2691 if(/*fkReconstructor->IsHLT()*/kFALSE){
692decf4 2692 cseed[jLayer].UpdateUsed();
cfa15645 2693 if(!cseed[jLayer].IsOK()) continue;
2694 }else{
2695 cseed[jLayer].Fit();
2696 cseed[jLayer].UpdateUsed();
2697 cseed[jLayer].ResetClusterIter();
2698 while((cl = cseed[jLayer].NextCluster())){
2699 if(!cl->IsInChamber()) nNotInChamber++;
2700 }
2701 //printf("clusters[%d], used[%d], not in chamber[%d]\n", cseed[jLayer].GetN(), cseed[jLayer].GetNUsed(), nNotInChamber);
2702 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
2703 }
d611c74f 2704 mlayers++;
2705 }
be24510a 2706
2707 if(mlayers < kNSeedPlanes){
2708 //AliInfo(Form("Failed updating all seeds %d [%d].", mlayers, kNSeedPlanes));
2709 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2710 continue;
2711 }
2712
2713 // temporary exit door for the HLT
4d6aee34 2714 if(fkReconstructor->IsHLT()){
be24510a 2715 // attach clusters to extrapolation chambers
2716 for(int iLayer=0; iLayer<kNPlanes-kNSeedPlanes; iLayer++){
2717 Int_t jLayer = planesExt[iLayer];
2718 if(!(chamber = stack[jLayer])) continue;
f29f13a6 2719 cseed[jLayer].AttachClusters(chamber, kTRUE);
5f1ae1e7 2720 cseed[jLayer].Fit();
be24510a 2721 }
4302c900 2722 fTrackQuality[ntracks] = 1.; // dummy value
2723 ntracks++;
218ba867 2724 if(ntracks == kMaxTracksStack) return ntracks;
4302c900 2725 cseed += 6;
2726 continue;
2727 }
2728
be24510a 2729
f29f13a6 2730 // Update Seeds and calculate Likelihood
d611c74f 2731 // fit tracklets and cook likelihood
f29f13a6 2732 FitTiltedRieman(&cseed[0], kTRUE);
2733 for(int iLayer=0; iLayer<kNSeedPlanes; iLayer++){
2734 Int_t jLayer = planes[iLayer];
2735 cseed[jLayer].Fit(kTRUE);
2736 }
91834b8d 2737 Double_t like = CookLikelihood(&cseed[0], planes); // to be checked
d611c74f 2738
4d6aee34 2739 if (TMath::Log(1.E-9 + like) < fkReconstructor->GetRecoParam() ->GetTrackLikelihood()){
d611c74f 2740 //AliInfo(Form("Failed likelihood %f[%e].", TMath::Log(1.E-9 + like), like));
2741 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2742 continue;
2743 }
2744 //AliInfo(Form("Passed likelihood %f[%e].", TMath::Log(1.E-9 + like), like));
2745
2746 // book preliminary results
2747 seedQuality[ntracks] = like;
2748 fSeedLayer[ntracks] = config;/*sLayer;*/
2749
2750 // attach clusters to the extrapolation seeds
be24510a 2751 for(int iLayer=0; iLayer<kNPlanes-kNSeedPlanes; iLayer++){
2752 Int_t jLayer = planesExt[iLayer];
d611c74f 2753 if(!(chamber = stack[jLayer])) continue;
d611c74f 2754
2755 // fit extrapolated seed
2756 if ((jLayer == 0) && !(cseed[1].IsOK())) continue;
2757 if ((jLayer == 5) && !(cseed[4].IsOK())) continue;
2758 AliTRDseedV1 pseed = cseed[jLayer];
f29f13a6 2759 if(!pseed.AttachClusters(chamber, kTRUE)) continue;
2760 pseed.Fit(kTRUE);
d611c74f 2761 cseed[jLayer] = pseed;
d611c74f 2762 FitTiltedRieman(cseed, kTRUE);
f29f13a6 2763 cseed[jLayer].Fit(kTRUE);
d611c74f 2764 }
2765
2766 // AliInfo("Extrapolation done.");
2767 // Debug Stream containing all the 6 tracklets
a2fbb6ec 2768 if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) >= 2 && fkReconstructor->IsDebugStreaming()){
2769 TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
d611c74f 2770 TLinearFitter *tiltedRieman = GetTiltedRiemanFitter();
2771 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2772 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2773 cstreamer << "MakeSeeds1"
2774 << "EventNumber=" << eventNumber
2775 << "CandidateNumber=" << candidateNumber
2776 << "S0.=" << &cseed[0]
2777 << "S1.=" << &cseed[1]
2778 << "S2.=" << &cseed[2]
2779 << "S3.=" << &cseed[3]
2780 << "S4.=" << &cseed[4]
2781 << "S5.=" << &cseed[5]
2782 << "FitterT.=" << tiltedRieman
2783 << "\n";
2784 }
2785
a2fbb6ec 2786 if(fkReconstructor->GetRecoParam()->HasImproveTracklets() && ImproveSeedQuality(stack, cseed) < 4){
d611c74f 2787 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2788 continue;
2789 }
2790 //AliInfo("Improve seed quality done.");
2791
2792 // fit full track and cook likelihoods
2793 // Double_t curv = FitRieman(&cseed[0], chi2);
2794 // Double_t chi2ZF = chi2[0] / TMath::Max((mlayers - 3.), 1.);
2795 // Double_t chi2RF = chi2[1] / TMath::Max((mlayers - 3.), 1.);
2796
2797 // do the final track fitting (Once with vertex constraint and once without vertex constraint)
2798 Double_t chi2Vals[3];
6e39bde4 2799 chi2Vals[0] = FitTiltedRieman(&cseed[0], kTRUE);
a2fbb6ec 2800 if(fkReconstructor->GetRecoParam()->IsVertexConstrained())
d611c74f 2801 chi2Vals[1] = FitTiltedRiemanConstraint(&cseed[0], GetZ()); // Do Vertex Constrained fit if desired
2802 else
2803 chi2Vals[1] = 1.;
2804 chi2Vals[2] = GetChi2Z(&cseed[0]) / TMath::Max((mlayers - 3.), 1.);
2805 // Chi2 definitions in testing stage
2806 //chi2Vals[2] = GetChi2ZTest(&cseed[0]);
2807 fTrackQuality[ntracks] = CalculateTrackLikelihood(&cseed[0], &chi2Vals[0]);
2808 //AliInfo("Hyperplane fit done\n");
fac58f00 2809
a2fbb6ec 2810 if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) >= 2 && fkReconstructor->IsDebugStreaming()){
2811 TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
d611c74f 2812 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2813 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2814 TLinearFitter *fitterTC = GetTiltedRiemanFitterConstraint();
2815 TLinearFitter *fitterT = GetTiltedRiemanFitter();
91834b8d 2816 Int_t ncls = 0;
2817 for(Int_t iseed = 0; iseed < kNPlanes; iseed++){
2818 ncls += cseed[iseed].IsOK() ? cseed[iseed].GetN2() : 0;
2819 }
d611c74f 2820 cstreamer << "MakeSeeds2"
2821 << "EventNumber=" << eventNumber
2822 << "CandidateNumber=" << candidateNumber
2823 << "Chi2TR=" << chi2Vals[0]
2824 << "Chi2TC=" << chi2Vals[1]
2825 << "Nlayers=" << mlayers
91834b8d 2826 << "NClusters=" << ncls
d611c74f 2827 << "Like=" << like
2828 << "S0.=" << &cseed[0]
2829 << "S1.=" << &cseed[1]
2830 << "S2.=" << &cseed[2]
2831 << "S3.=" << &cseed[3]
2832 << "S4.=" << &cseed[4]
2833 << "S5.=" << &cseed[5]
d611c74f 2834 << "FitterT.=" << fitterT
2835 << "FitterTC.=" << fitterTC
2836 << "\n";
2837 }
2838
2839 ntracks++;
2840 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2841 if(ntracks == kMaxTracksStack){
2842 AliWarning(Form("Number of seeds reached maximum allowed (%d) in stack.", kMaxTracksStack));
2843 return ntracks;
2844 }
2845 cseed += 6;
41702fec 2846 }
2847 }
2848 }
41702fec 2849
2850 return ntracks;
e4f2f73d 2851}
2852
2853//_____________________________________________________________________________
e17f4785 2854AliTRDtrackV1* AliTRDtrackerV1::MakeTrack(AliTRDseedV1 * const seeds, Double_t *params)
e4f2f73d 2855{
afa21247 2856//
2857// Build a TRD track out of tracklet candidates
2858//
2859// Parameters :
2860// seeds : array of tracklets
2861// params : array of track parameters as they are estimated by stand alone tracker. 7 elements.
2862// [0] - radial position of the track at reference point
2863// [1] - y position of the fit at [0]
2864// [2] - z position of the fit at [0]
2865// [3] - snp of the first tracklet
2866// [4] - tgl of the first tracklet
2867// [5] - curvature of the Riemann fit - 1/pt
2868// [6] - sector rotation angle
2869//
2870// Output :
2871// The TRD track.
2872//
2873// Initialize the TRD track based on the parameters of the fit and a parametric covariance matrix
2874// (diagonal with constant variance terms TODO - correct parameterization)
2875//
2876// In case of HLT just register the tracklets in the tracker and return values of the Riemann fit. For the
2877// offline case perform a full Kalman filter on the already found tracklets (see AliTRDtrackerV1::FollowBackProlongation()
2878// for details). Do also MC label calculation and PID if propagation successfully.
41702fec 2879
afa21247 2880
41702fec 2881 Double_t alpha = AliTRDgeometry::GetAlpha();
2882 Double_t shift = AliTRDgeometry::GetAlpha()/2.0;
2883 Double_t c[15];
2884
afa21247 2885 c[ 0] = 0.2; // s^2_y
2886 c[ 1] = 0.0; c[ 2] = 2.0; // s^2_z
2887 c[ 3] = 0.0; c[ 4] = 0.0; c[ 5] = 0.02; // s^2_snp
2888 c[ 6] = 0.0; c[ 7] = 0.0; c[ 8] = 0.0; c[ 9] = 0.1; // s^2_tgl
2889 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 2890
d20df6fc 2891 AliTRDtrackV1 track(seeds, &params[1], c, params[0], params[6]*alpha+shift);
2892 track.PropagateTo(params[0]-5.0);
4d6aee34 2893 AliTRDseedV1 *ptrTracklet = NULL;
9887cc9f 2894
2895 // skip Kalman filter for HLT
5f1ae1e7 2896 if(/*fkReconstructor->IsHLT()*/kFALSE){
9887cc9f 2897 for (Int_t jLayer = 0; jLayer < AliTRDgeometry::kNlayer; jLayer++) {
2898 track.UnsetTracklet(jLayer);
e17f4785 2899 ptrTracklet = &seeds[jLayer];
9887cc9f 2900 if(!ptrTracklet->IsOK()) continue;
5f1ae1e7 2901 if(TMath::Abs(ptrTracklet->GetYref(1) - ptrTracklet->GetYfit(1)) >= .2) continue; // check this condition with Marian
9887cc9f 2902 ptrTracklet = SetTracklet(ptrTracklet);
f29f13a6 2903 ptrTracklet->UseClusters();
91834b8d 2904 track.SetTracklet(ptrTracklet, fTracklets->GetEntriesFast()-1);
2905 }
d78d7df0 2906 AliTRDtrackV1 *ptrTrack = SetTrack(&track);
799e38d7 2907 ptrTrack->CookPID();
5f1ae1e7 2908 ptrTrack->CookLabel(.9);
4d6aee34 2909 ptrTrack->SetReconstructor(fkReconstructor);
d78d7df0 2910 return ptrTrack;
91834b8d 2911 }
393fda1c 2912
d20df6fc 2913 track.ResetCovariance(1);
e79f8eb0 2914 Int_t nc = TMath::Abs(FollowBackProlongation(track));
a2fbb6ec 2915 if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) > 5 && fkReconstructor->IsDebugStreaming()){
393fda1c 2916 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2917 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2918 Double_t p[5]; // Track Params for the Debug Stream
2919 track.GetExternalParameters(params[0], p);
a2fbb6ec 2920 TTreeSRedirector &cs = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
393fda1c 2921 cs << "MakeTrack"
2922 << "EventNumber=" << eventNumber
2923 << "CandidateNumber=" << candidateNumber
2924 << "nc=" << nc
2925 << "X=" << params[0]
2926 << "Y=" << p[0]
2927 << "Z=" << p[1]
2928 << "snp=" << p[2]
2929 << "tnd=" << p[3]
2930 << "crv=" << p[4]
2931 << "Yin=" << params[1]
2932 << "Zin=" << params[2]
2933 << "snpin=" << params[3]
2934 << "tndin=" << params[4]
2935 << "crvin=" << params[5]
2936 << "track.=" << &track
2937 << "\n";
2938 }
4d6aee34 2939 if (nc < 30) return NULL;
d20df6fc 2940
2941 AliTRDtrackV1 *ptrTrack = SetTrack(&track);
4d6aee34 2942 ptrTrack->SetReconstructor(fkReconstructor);
48f8adf3 2943 ptrTrack->CookLabel(.9);
24253b0a 2944
d20df6fc 2945 // computes PID for track
2946 ptrTrack->CookPID();
2947 // update calibration references using this track
48f8adf3 2948 AliTRDCalibraFillHisto *calibra = AliTRDCalibraFillHisto::Instance();
2949 if (!calibra){
2950 AliInfo("Could not get Calibra instance\n");
2951 if(calibra->GetHisto2d()) calibra->UpdateHistogramsV1(ptrTrack);
2952 }
d20df6fc 2953 return ptrTrack;
e4f2f73d 2954}
2955
0906e73e 2956
2957//____________________________________________________________________
eb38ed55 2958Int_t AliTRDtrackerV1::ImproveSeedQuality(AliTRDtrackingChamber **stack, AliTRDseedV1 *cseed)
e4f2f73d 2959{
41702fec 2960 //
2961 // Sort tracklets according to "quality" and try to "improve" the first 4 worst
2962 //
2963 // Parameters :
2964 // layers : Array of propagation layers for a stack/supermodule
2965 // cseed : Array of 6 seeding tracklets which has to be improved
2966 //
f29f13a6 2967 // Output :
41702fec 2968 // cssed : Improved seeds
2969 //
2970 // Detailed description
2971 //
2972 // Iterative procedure in which new clusters are searched for each
2973 // tracklet seed such that the seed quality (see AliTRDseed::GetQuality())
2974 // can be maximized. If some optimization is found the old seeds are replaced.
2975 //
2976 // debug level: 7
2977 //
2978
2979 // make a local working copy
4d6aee34 2980 AliTRDtrackingChamber *chamber = NULL;
41702fec 2981 AliTRDseedV1 bseed[6];
2982 Int_t nLayers = 0;
2983 for (Int_t jLayer = 0; jLayer < 6; jLayer++) bseed[jLayer] = cseed[jLayer];
2984
2985 Float_t lastquality = 10000.0;
2986 Float_t lastchi2 = 10000.0;
2987 Float_t chi2 = 1000.0;
2988
2989 for (Int_t iter = 0; iter < 4; iter++) {
2990 Float_t sumquality = 0.0;
2991 Float_t squality[6];
2992 Int_t sortindexes[6];
2993
2994 for (Int_t jLayer = 0; jLayer < 6; jLayer++) {
3a039a31 2995 squality[jLayer] = bseed[jLayer].IsOK() ? bseed[jLayer].GetQuality(kTRUE) : 1000.;
41702fec 2996 sumquality += squality[jLayer];
2997 }
2998 if ((sumquality >= lastquality) || (chi2 > lastchi2)) break;
2999
3000 nLayers = 0;
3001 lastquality = sumquality;
3002 lastchi2 = chi2;
3003 if (iter > 0) for (Int_t jLayer = 0; jLayer < 6; jLayer++) cseed[jLayer] = bseed[jLayer];
3004
3005 TMath::Sort(6, squality, sortindexes, kFALSE);
3006 for (Int_t jLayer = 5; jLayer > 1; jLayer--) {
3007 Int_t bLayer = sortindexes[jLayer];
3008 if(!(chamber = stack[bLayer])) continue;
f29f13a6 3009 bseed[bLayer].AttachClusters(chamber, kTRUE);
3010 bseed[bLayer].Fit(kTRUE);
41702fec 3011 if(bseed[bLayer].IsOK()) nLayers++;
3012 }
3013
3014 chi2 = FitTiltedRieman(bseed, kTRUE);
a2fbb6ec 3015 if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) >= 7 && fkReconstructor->IsDebugStreaming()){
41702fec 3016 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
3017 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
3018 TLinearFitter *tiltedRieman = GetTiltedRiemanFitter();
a2fbb6ec 3019 TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
41702fec 3020 cstreamer << "ImproveSeedQuality"
3021 << "EventNumber=" << eventNumber
3022 << "CandidateNumber=" << candidateNumber
3023 << "Iteration=" << iter
3024 << "S0.=" << &bseed[0]
3025 << "S1.=" << &bseed[1]
3026 << "S2.=" << &bseed[2]
3027 << "S3.=" << &bseed[3]
3028 << "S4.=" << &bseed[4]
3029 << "S5.=" << &bseed[5]
3030 << "FitterT.=" << tiltedRieman
3031 << "\n";
3032 }
3033 } // Loop: iter
41702fec 3034 // we are sure that at least 2 tracklets are OK !
3035 return nLayers+2;
e4f2f73d 3036}
3037
eb38ed55 3038//_________________________________________________________________________
4d6aee34 3039Double_t AliTRDtrackerV1::CalculateTrackLikelihood(const AliTRDseedV1 *const tracklets, Double_t *chi2){
41702fec 3040 //
3041 // Calculates the Track Likelihood value. This parameter serves as main quality criterion for
3042 // the track selection
3043 // The likelihood value containes:
3044 // - The chi2 values from the both fitters and the chi2 values in z-direction from a linear fit
3045 // - The Sum of the Parameter |slope_ref - slope_fit|/Sigma of the tracklets
3046 // For all Parameters an exponential dependency is used
3047 //
3048 // Parameters: - Array of tracklets (AliTRDseedV1) related to the track candidate
3049 // - Array of chi2 values:
3050 // * Non-Constrained Tilted Riemann fit
3051 // * Vertex-Constrained Tilted Riemann fit
3052 // * z-Direction from Linear fit
3053 // Output: - The calculated track likelihood
3054 //
3055 // debug level 2
3056 //
3057
f29f13a6 3058 Double_t chi2phi = 0, nLayers = 0;
41702fec 3059 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
3060 if(!tracklets[iLayer].IsOK()) continue;
f29f13a6 3061 chi2phi += tracklets[iLayer].GetChi2Phi();
41702fec 3062 nLayers++;
3063 }
f29f13a6 3064 chi2phi /= Float_t (nLayers - 2.0);
41702fec 3065
3066 Double_t likeChi2Z = TMath::Exp(-chi2[2] * 0.14); // Chi2Z
a2fbb6ec 3067 Double_t likeChi2TC = (fkReconstructor->GetRecoParam()->IsVertexConstrained()) ?
d20df6fc 3068 TMath::Exp(-chi2[1] * 0.677) : 1; // Constrained Tilted Riemann
6e39bde4 3069 Double_t likeChi2TR = TMath::Exp(-chi2[0] * 0.0078); // Non-constrained Tilted Riemann
3070 Double_t likeChi2Phi= TMath::Exp(-chi2phi * 3.23);//3.23
f29f13a6 3071 Double_t trackLikelihood = likeChi2Z * likeChi2TR * likeChi2Phi;
41702fec 3072
a2fbb6ec 3073 if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) >= 2 && fkReconstructor->IsDebugStreaming()){
41702fec 3074 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
3075 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
a2fbb6ec 3076 TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
41702fec 3077 cstreamer << "CalculateTrackLikelihood0"
3078 << "EventNumber=" << eventNumber
3079 << "CandidateNumber=" << candidateNumber
3080 << "LikeChi2Z=" << likeChi2Z
3081 << "LikeChi2TR=" << likeChi2TR
3082 << "LikeChi2TC=" << likeChi2TC
f29f13a6 3083 << "LikeChi2Phi=" << likeChi2Phi
41702fec 3084 << "TrackLikelihood=" << trackLikelihood
3085 << "\n";
3086 }
6e39bde4 3087
41702fec 3088 return trackLikelihood;
e4f2f73d 3089}
3090
3091//____________________________________________________________________
91834b8d 3092Double_t AliTRDtrackerV1::CookLikelihood(AliTRDseedV1 *cseed, Int_t planes[4])
e4f2f73d 3093{
41702fec 3094 //
3095 // Calculate the probability of this track candidate.
3096 //
3097 // Parameters :
3098 // cseeds : array of candidate tracklets
3099 // planes : array of seeding planes (see seeding configuration)
3100 // chi2 : chi2 values (on the Z and Y direction) from the rieman fit of the track.
3101 //
3102 // Output :
3103 // likelihood value
3104 //
3105 // Detailed description
3106 //
3107 // The track quality is estimated based on the following 4 criteria:
3108 // 1. precision of the rieman fit on the Y direction (likea)
3109 // 2. chi2 on the Y direction (likechi2y)
3110 // 3. chi2 on the Z direction (likechi2z)
3111 // 4. number of attached clusters compared to a reference value
3112 // (see AliTRDrecoParam::fkFindable) (likeN)
3113 //
3114 // The distributions for each type of probabilities are given below as of
3115 // (date). They have to be checked to assure consistency of estimation.
3116 //
3117
3118 // ratio of the total number of clusters/track which are expected to be found by the tracker.
4d6aee34 3119 const AliTRDrecoParam *fRecoPars = fkReconstructor->GetRecoParam();
41702fec 3120
91834b8d 3121 Double_t chi2y = GetChi2Y(&cseed[0]);
3122 Double_t chi2z = GetChi2Z(&cseed[0]);
3123
8ae98148 3124 Float_t nclusters = 0.;
41702fec 3125 Double_t sumda = 0.;
3126 for(UChar_t ilayer = 0; ilayer < 4; ilayer++){
3127 Int_t jlayer = planes[ilayer];
3128 nclusters += cseed[jlayer].GetN2();
e3cf3d02 3129 sumda += TMath::Abs(cseed[jlayer].GetYfit(1) - cseed[jlayer].GetYref(1));
41702fec 3130 }
8ae98148 3131 nclusters *= .25;
3132
5a2e200c 3133 Double_t likea = TMath::Exp(-sumda * fRecoPars->GetPhiSlope());
41702fec 3134 Double_t likechi2y = 0.0000000001;
4d6aee34 3135 if (fkReconstructor->IsCosmic() || chi2y < fRecoPars->GetChi2YCut()) likechi2y += TMath::Exp(-TMath::Sqrt(chi2y) * fRecoPars->GetChi2YSlope());
5a2e200c 3136 Double_t likechi2z = TMath::Exp(-chi2z * fRecoPars->GetChi2ZSlope());
8ae98148 3137 Double_t likeN = TMath::Exp(-(fRecoPars->GetNMeanClusters() - nclusters) / fRecoPars->GetNSigmaClusters());
41702fec 3138 Double_t like = likea * likechi2y * likechi2z * likeN;
3139
a2fbb6ec 3140 if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) >= 2 && fkReconstructor->IsDebugStreaming()){
41702fec 3141 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
3142 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
4d6aee34 3143 Int_t nTracklets = 0; Float_t meanNcls = 0;
91834b8d 3144 for(Int_t iseed=0; iseed < kNPlanes; iseed++){
3145 if(!cseed[iseed].IsOK()) continue;
3146 nTracklets++;
4d6aee34 3147 meanNcls += cseed[iseed].GetN2();
91834b8d 3148 }
4d6aee34 3149 if(nTracklets) meanNcls /= nTracklets;
41702fec 3150 // The Debug Stream contains the seed
a2fbb6ec 3151 TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
41702fec 3152 cstreamer << "CookLikelihood"
3153 << "EventNumber=" << eventNumber
3154 << "CandidateNumber=" << candidateNumber
3155 << "tracklet0.=" << &cseed[0]
3156 << "tracklet1.=" << &cseed[1]
3157 << "tracklet2.=" << &cseed[2]
3158 << "tracklet3.=" << &cseed[3]
3159 << "tracklet4.=" << &cseed[4]
3160 << "tracklet5.=" << &cseed[5]
3161 << "sumda=" << sumda
91834b8d 3162 << "chi2y=" << chi2y
3163 << "chi2z=" << chi2z
41702fec 3164 << "likea=" << likea
3165 << "likechi2y=" << likechi2y
3166 << "likechi2z=" << likechi2z
3167 << "nclusters=" << nclusters
3168 << "likeN=" << likeN
3169 << "like=" << like
4d6aee34 3170 << "meanncls=" << meanNcls
41702fec 3171 << "\n";
3172 }
3173
3174 return like;
e4f2f73d 3175}
3176
e4f2f73d 3177//____________________________________________________________________
0906e73e 3178void AliTRDtrackerV1::GetSeedingConfig(Int_t iconfig, Int_t planes[4])
e4f2f73d 3179{
41702fec 3180 //
3181 // Map seeding configurations to detector planes.
3182 //
3183 // Parameters :
3184 // iconfig : configuration index
3185 // planes : member planes of this configuration. On input empty.
3186 //
3187 // Output :
3188 // planes : contains the planes which are defining the configuration
3189 //
3190 // Detailed description
3191 //
3192 // Here is the list of seeding planes configurations together with
3193 // their topological classification:
3194 //
3195 // 0 - 5432 TQ 0
3196 // 1 - 4321 TQ 0
3197 // 2 - 3210 TQ 0
3198 // 3 - 5321 TQ 1
3199 // 4 - 4210 TQ 1
3200 // 5 - 5431 TQ 1
3201 // 6 - 4320 TQ 1
3202 // 7 - 5430 TQ 2
3203 // 8 - 5210 TQ 2
3204 // 9 - 5421 TQ 3
3205 // 10 - 4310 TQ 3
3206 // 11 - 5410 TQ 4
3207 // 12 - 5420 TQ 5
3208 // 13 - 5320 TQ 5
3209 // 14 - 5310 TQ 5
3210 //
3211 // The topologic quality is modeled as follows:
3212 // 1. The general model is define by the equation:
3213 // p(conf) = exp(-conf/2)
3214 // 2. According to the topologic classification, configurations from the same
3215 // class are assigned the agerage value over the model values.
3216 // 3. Quality values are normalized.
3217 //
3218 // The topologic quality distribution as function of configuration is given below:
3219 //Begin_Html
3220 // <img src="gif/topologicQA.gif">
3221 //End_Html
3222 //
3223
3224 switch(iconfig){
3225 case 0: // 5432 TQ 0