Patch to fix nTimeBins in case of reconstruction from digits (Theo)
[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"
828c6f80 52#include "AliTRDdigitsParam.h"
e4f2f73d 53#include "AliTRDseedV1.h"
0906e73e 54#include "AliTRDtrackV1.h"
bb56afff 55#include "AliTRDtrackerV1.h"
56#include "AliTRDtrackerDebug.h"
57#include "AliTRDtrackingChamber.h"
58#include "AliTRDchamberTimeBin.h"
59
e4f2f73d 60ClassImp(AliTRDtrackerV1)
903326c1 61ClassImp(AliTRDtrackerV1::AliTRDLeastSquare)
62ClassImp(AliTRDtrackerV1::AliTRDtrackFitterRieman)
eb38ed55 63
eb38ed55 64const Float_t AliTRDtrackerV1::fgkMinClustersInTrack = 0.5; //
65const Float_t AliTRDtrackerV1::fgkLabelFraction = 0.8; //
66const Double_t AliTRDtrackerV1::fgkMaxChi2 = 12.0; //
67const Double_t AliTRDtrackerV1::fgkMaxSnp = 0.95; // Maximum local sine of the azimuthal angle
68const Double_t AliTRDtrackerV1::fgkMaxStep = 2.0; // Maximal step size in propagation
d76231c8 69Double_t AliTRDtrackerV1::fgTopologicQA[kNConfigs] = {
6e39bde4 70 0.5112, 0.5112, 0.5112, 0.0786, 0.0786,
41702fec 71 0.0786, 0.0786, 0.0579, 0.0579, 0.0474,
72 0.0474, 0.0408, 0.0335, 0.0335, 0.0335
e165b64b 73};
74const Double_t AliTRDtrackerV1::fgkX0[kNPlanes] = {
75 300.2, 312.8, 325.4, 338.0, 350.6, 363.2};
2985ffcb 76Int_t AliTRDtrackerV1::fgNTimeBins = 0;
4d6aee34 77AliRieman* AliTRDtrackerV1::fgRieman = NULL;
78TLinearFitter* AliTRDtrackerV1::fgTiltedRieman = NULL;
79TLinearFitter* AliTRDtrackerV1::fgTiltedRiemanConstrained = NULL;
e4f2f73d 80
81//____________________________________________________________________
3a039a31 82AliTRDtrackerV1::AliTRDtrackerV1(AliTRDReconstructor *rec)
41702fec 83 :AliTracker()
4d6aee34 84 ,fkReconstructor(NULL)
85 ,fGeom(NULL)
86 ,fClusters(NULL)
87 ,fTracklets(NULL)
88 ,fTracks(NULL)
b1135f96 89 ,fTracksESD(NULL)
41702fec 90 ,fSieveSeeding(0)
e4f2f73d 91{
41702fec 92 //
93 // Default constructor.
94 //
eb2b4f91 95
96 SetReconstructor(rec); // initialize reconstructor
97
98 // initialize geometry
99 if(!AliGeomManager::GetGeometry()){
100 AliFatal("Could not get geometry.");
101 }
102 fGeom = new AliTRDgeometry();
103 fGeom->CreateClusterMatrixArray();
4d6aee34 104 TGeoHMatrix *matrix = NULL;
eb2b4f91 105 Double_t loc[] = {0., 0., 0.};
106 Double_t glb[] = {0., 0., 0.};
107 for(Int_t ily=kNPlanes; ily--;){
e165b64b 108 Int_t ism = 0;
109 while(!(matrix = fGeom->GetClusterMatrix(AliTRDgeometry::GetDetector(ily, 2, ism)))) ism++;
110 if(!matrix){
111 AliError(Form("Could not get transformation matrix for layer %d. Use default.", ily));
112 fR[ily] = fgkX0[ily];
eb2b4f91 113 continue;
114 }
115 matrix->LocalToMaster(loc, glb);
116 fR[ily] = glb[0]+ AliTRDgeometry::AnodePos()-.5*AliTRDgeometry::AmThick() - AliTRDgeometry::DrThick();
117 }
118
eb2b4f91 119 // initialize cluster containers
053767a4 120 for (Int_t isector = 0; isector < AliTRDgeometry::kNsector; isector++) new(&fTrSec[isector]) AliTRDtrackingSector(fGeom, isector);
3a039a31 121
eb2b4f91 122 // initialize arrays
123 memset(fTrackQuality, 0, kMaxTracksStack*sizeof(Double_t));
124 memset(fSeedLayer, 0, kMaxTracksStack*sizeof(Int_t));
125 memset(fSeedTB, 0, kNSeedPlanes*sizeof(AliTRDchamberTimeBin*));
b1135f96 126 fTracksESD = new TClonesArray("AliESDtrack", 2*kMaxTracksStack);
127 fTracksESD->SetOwner();
eb38ed55 128}
129
e4f2f73d 130//____________________________________________________________________
131AliTRDtrackerV1::~AliTRDtrackerV1()
132{
41702fec 133 //
134 // Destructor
135 //
136
4d6aee34 137 if(fgRieman) delete fgRieman; fgRieman = NULL;
138 if(fgTiltedRieman) delete fgTiltedRieman; fgTiltedRieman = NULL;
139 if(fgTiltedRiemanConstrained) delete fgTiltedRiemanConstrained; fgTiltedRiemanConstrained = NULL;
d611c74f 140 for(Int_t isl =0; isl<kNSeedPlanes; isl++) if(fSeedTB[isl]) delete fSeedTB[isl];
b1135f96 141 if(fTracksESD){ fTracksESD->Delete(); delete fTracksESD; }
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 }
980d5a2a 180 AliInfo(Form("Number of tracks: !TRDin[%d]", ntracks));
41702fec 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
e3d45279 272 if(!fClusters || !fClusters->GetEntriesFast()){
273 AliInfo("No TRD clusters");
274 return 0;
275 }
2a3191bb 276 AliTRDCalibraFillHisto *calibra = AliTRDCalibraFillHisto::Instance(); // Calibration monitor
e3d45279 277 if (!calibra) AliInfo("Could not get Calibra instance");
c6f7c6cb 278 if (!fgNTimeBins) fgNTimeBins = fkReconstructor->GetNTimeBins();
828c6f80 279
eb2b4f91 280 // Define scalers
281 Int_t nFound = 0, // number of tracks found
282 nSeeds = 0, // total number of ESD seeds
283 nTRDseeds= 0, // number of seeds in the TRD acceptance
284 nTPCseeds= 0; // number of TPC seeds
41702fec 285 Float_t foundMin = 20.0;
286
4d6aee34 287 Float_t *quality = NULL;
288 Int_t *index = NULL;
eb2b4f91 289 nSeeds = event->GetNumberOfTracks();
290 // Sort tracks according to quality
291 // (covariance in the yz plane)
292 if(nSeeds){
293 quality = new Float_t[nSeeds];
294 index = new Int_t[nSeeds];
295 for (Int_t iSeed = nSeeds; iSeed--;) {
d611c74f 296 AliESDtrack *seed = event->GetTrack(iSeed);
297 Double_t covariance[15];
298 seed->GetExternalCovariance(covariance);
299 quality[iSeed] = covariance[0] + covariance[2];
300 }
eb2b4f91 301 TMath::Sort(nSeeds, quality, index,kFALSE);
41702fec 302 }
41702fec 303
eb2b4f91 304 // Propagate all seeds
41702fec 305 Int_t expectedClr;
306 AliTRDtrackV1 track;
eb2b4f91 307 for (Int_t iSeed = 0; iSeed < nSeeds; iSeed++) {
41702fec 308
309 // Get the seeds in sorted sequence
310 AliESDtrack *seed = event->GetTrack(index[iSeed]);
eb2b4f91 311 Float_t p4 = seed->GetC(seed->GetBz());
41702fec 312
313 // Check the seed status
314 ULong_t status = seed->GetStatus();
315 if ((status & AliESDtrack::kTPCout) == 0) continue;
316 if ((status & AliESDtrack::kTRDout) != 0) continue;
eb2b4f91 317
318 // Propagate to the entrance in the TRD mother volume
41702fec 319 new(&track) AliTRDtrackV1(*seed);
eb2b4f91 320 if(AliTRDgeometry::GetXtrdBeg() > (fgkMaxStep + track.GetX()) && !PropagateToX(track, AliTRDgeometry::GetXtrdBeg(), fgkMaxStep)){
321 seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
322 continue;
323 }
324 if(!AdjustSector(&track)){
325 seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
326 continue;
327 }
328 if(TMath::Abs(track.GetSnp()) > fgkMaxSnp) {
329 seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
330 continue;
331 }
332
333 nTPCseeds++;
e4d4864b 334
eb2b4f91 335 // store track status at TRD entrance
76b60503 336 seed->UpdateTrackParams(&track, AliESDtrack::kTRDbackup);
ae3fbe1f 337
eb2b4f91 338 // prepare track and do propagation in the TRD
4d6aee34 339 track.SetReconstructor(fkReconstructor);
eb2b4f91 340 track.SetKink(Bool_t(seed->GetKinkIndex(0)));
341 expectedClr = FollowBackProlongation(track);
342 // check if track entered the TRD fiducial volume
343 if(track.GetTrackLow()){
344 seed->UpdateTrackParams(&track, AliESDtrack::kTRDin);
345 nTRDseeds++;
346 }
347 // check if track was stopped in the TRD
348 if (expectedClr<0){
349 seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
350 continue;
351 }
ae3fbe1f 352
353 if(expectedClr){
eb2b4f91 354 nFound++;
41702fec 355 // computes PID for track
356 track.CookPID();
357 // update calibration references using this track
358 if(calibra->GetHisto2d()) calibra->UpdateHistogramsV1(&track);
359 // save calibration object
a2fbb6ec 360 if (fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) > 0){
224f357f 361 AliTRDtrackV1 *calibTrack = new AliTRDtrackV1(track);
362 calibTrack->SetOwner();
363 seed->AddCalibObject(calibTrack);
364 }
365 //update ESD track
050875b0 366 seed->UpdateTrackParams(&track, AliESDtrack::kTRDout);
367 track.UpdateESDtrack(seed);
41702fec 368 }
369
27fbeba8 370 if ((TMath::Abs(track.GetC(track.GetBz()) - p4) / TMath::Abs(p4) < 0.2) ||(track.Pt() > 0.8)) {
e3cf3d02 371
41702fec 372 // Make backup for back propagation
41702fec 373 Int_t foundClr = track.GetNumberOfClusters();
374 if (foundClr >= foundMin) {
41702fec 375 track.CookLabel(1. - fgkLabelFraction);
f29f13a6 376 //if(track.GetBackupTrack()) UseClusters(track.GetBackupTrack());
41702fec 377
378 // Sign only gold tracks
379 if (track.GetChi2() / track.GetNumberOfClusters() < 4) {
f29f13a6 380 //if ((seed->GetKinkIndex(0) == 0) && (track.Pt() < 1.5)) UseClusters(&track);
41702fec 381 }
382 Bool_t isGold = kFALSE;
383
384 // Full gold track
385 if (track.GetChi2() / track.GetNumberOfClusters() < 5) {
386 if (track.GetBackupTrack()) seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup);
387
388 isGold = kTRUE;
389 }
390
391 // Almost gold track
392 if ((!isGold) && (track.GetNCross() == 0) && (track.GetChi2() / track.GetNumberOfClusters() < 7)) {
393 //seed->UpdateTrackParams(track, AliESDtrack::kTRDbackup);
394 if (track.GetBackupTrack()) seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup);
395
396 isGold = kTRUE;
397 }
398
399 if ((!isGold) && (track.GetBackupTrack())) {
400 if ((track.GetBackupTrack()->GetNumberOfClusters() > foundMin) && ((track.GetBackupTrack()->GetChi2()/(track.GetBackupTrack()->GetNumberOfClusters()+1)) < 7)) {
401 seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup);
402 isGold = kTRUE;
403 }
404 }
41702fec 405 }
406 }
407
eb2b4f91 408 // Propagation to the TOF
409 if(!(seed->GetStatus()&AliESDtrack::kTRDStop)) {
410 Int_t sm = track.GetSector();
411 // default value in case we have problems with the geometry.
412 Double_t xtof = 371.;
413 //Calculate radial position of the beginning of the TOF
414 //mother volume. In order to avoid mixing of the TRD
415 //and TOF modules some hard values are needed. This are:
416 //1. The path to the TOF module.
417 //2. The width of the TOF (29.05 cm)
418 //(with the help of Annalisa de Caro Mar-17-2009)
419 if(gGeoManager){
420 gGeoManager->cd(Form("/ALIC_1/B077_1/BSEGMO%d_1/BTOF%d_1", sm, sm));
4d6aee34 421 TGeoHMatrix *m = NULL;
eb2b4f91 422 Double_t loc[]={0., 0., -.5*29.05}, glob[3];
423
424 if((m=gGeoManager->GetCurrentMatrix())){
425 m->LocalToMaster(loc, glob);
426 xtof = TMath::Sqrt(glob[0]*glob[0]+glob[1]*glob[1]);
427 }
41702fec 428 }
672b48bd 429 if(xtof > (fgkMaxStep + track.GetX()) && !PropagateToX(track, xtof, fgkMaxStep)){
430 seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
431 continue;
432 }
433 if(!AdjustSector(&track)){
434 seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
435 continue;
436 }
437 if(TMath::Abs(track.GetSnp()) > fgkMaxSnp){
438 seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
439 continue;
440 }
050875b0 441 //seed->UpdateTrackParams(&track, AliESDtrack::kTRDout);
eb2b4f91 442 // TODO obsolete - delete
443 seed->SetTRDQuality(track.StatusForTOF());
41702fec 444 }
41702fec 445 seed->SetTRDBudget(track.GetBudget(0));
446 }
d611c74f 447 if(index) delete [] index;
448 if(quality) delete [] quality;
41702fec 449
d4cf71ca 450 AliInfo(Form("Number of seeds: TPCout[%d] TRDin[%d]", nTPCseeds, nTRDseeds));
451 AliInfo(Form("Number of tracks: TRDout[%d]", nFound));
452
d611c74f 453 // run stand alone tracking
4d6aee34 454 if (fkReconstructor->IsSeeding()) Clusters2Tracks(event);
41702fec 455
456 return 0;
0906e73e 457}
458
459
460//____________________________________________________________________
461Int_t AliTRDtrackerV1::RefitInward(AliESDEvent *event)
462{
41702fec 463 //
464 // Refits tracks within the TRD. The ESD event is expected to contain seeds
465 // at the outer part of the TRD.
466 // The tracks are propagated to the innermost time bin
467 // of the TRD and the ESD event is updated
468 // Origin: Thomas KUHR (Thomas.Kuhr@cern.ch)
469 //
470
471 Int_t nseed = 0; // contor for loaded seeds
472 Int_t found = 0; // contor for updated TRD tracks
473
474
e3d45279 475 if(!fClusters || !fClusters->GetEntriesFast()){
476 AliInfo("No TRD clusters");
477 return 0;
478 }
41702fec 479 AliTRDtrackV1 track;
480 for (Int_t itrack = 0; itrack < event->GetNumberOfTracks(); itrack++) {
481 AliESDtrack *seed = event->GetTrack(itrack);
050875b0 482 ULong_t status = seed->GetStatus();
41702fec 483
050875b0 484 new(&track) AliTRDtrackV1(*seed);
41702fec 485 if (track.GetX() < 270.0) {
486 seed->UpdateTrackParams(&track, AliESDtrack::kTRDbackup);
487 continue;
488 }
489
e3cf3d02 490 // reject tracks which failed propagation in the TRD or
491 // are produced by the TRD stand alone tracker
e3cf3d02 492 if(!(status & AliESDtrack::kTRDout)) continue;
493 if(!(status & AliESDtrack::kTRDin)) continue;
41702fec 494 nseed++;
495
496 track.ResetCovariance(50.0);
497
498 // do the propagation and processing
499 Bool_t kUPDATE = kFALSE;
500 Double_t xTPC = 250.0;
501 if(FollowProlongation(track)){
502 // Prolongate to TPC
503 if (PropagateToX(track, xTPC, fgkMaxStep)) { // -with update
e3cf3d02 504 seed->UpdateTrackParams(&track, AliESDtrack::kTRDrefit);
505 found++;
506 kUPDATE = kTRUE;
507 }
508
509 // Update the friend track
a2fbb6ec 510 if (fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) > 0){
4d6aee34 511 TObject *o = NULL; Int_t ic = 0;
512 AliTRDtrackV1 *calibTrack = NULL;
e3cf3d02 513 while((o = seed->GetCalibObject(ic++))){
514 if(!(calibTrack = dynamic_cast<AliTRDtrackV1*>(o))) continue;
515 calibTrack->SetTrackHigh(track.GetTrackHigh());
516 }
41702fec 517 }
e3cf3d02 518 }
41702fec 519
520 // Prolongate to TPC without update
521 if(!kUPDATE) {
522 AliTRDtrackV1 tt(*seed);
e3cf3d02 523 if (PropagateToX(tt, xTPC, fgkMaxStep)) seed->UpdateTrackParams(&tt, AliESDtrack::kTRDbackup);
41702fec 524 }
525 }
980d5a2a 526 AliInfo(Form("Number of seeds: TRDout[%d]", nseed));
527 AliInfo(Form("Number of tracks: TRDrefit[%d]", found));
41702fec 528
529 return 0;
0906e73e 530}
531
0906e73e 532//____________________________________________________________________
533Int_t AliTRDtrackerV1::FollowProlongation(AliTRDtrackV1 &t)
534{
41702fec 535 // Extrapolates the TRD track in the TPC direction.
536 //
537 // Parameters
538 // t : the TRD track which has to be extrapolated
539 //
540 // Output
541 // number of clusters attached to the track
542 //
543 // Detailed description
544 //
545 // Starting from current radial position of track <t> this function
546 // extrapolates the track through the 6 TRD layers. The following steps
547 // are being performed for each plane:
548 // 1. prepare track:
549 // a. get plane limits in the local x direction
550 // b. check crossing sectors
551 // c. check track inclination
552 // 2. search tracklet in the tracker list (see GetTracklet() for details)
553 // 3. evaluate material budget using the geo manager
554 // 4. propagate and update track using the tracklet information.
555 //
556 // Debug level 2
557 //
558
e3cf3d02 559 Bool_t kStoreIn = kTRUE;
41702fec 560 Int_t nClustersExpected = 0;
e3cf3d02 561 for (Int_t iplane = kNPlanes; iplane--;) {
17896e82 562 Int_t index(-1);
41702fec 563 AliTRDseedV1 *tracklet = GetTracklet(&t, iplane, index);
17896e82 564 AliDebug(2, Form("Tracklet[%p] ly[%d] idx[%d]", (void*)tracklet, iplane, index));
41702fec 565 if(!tracklet) continue;
980d5a2a 566 if(!tracklet->IsOK()){
567 AliDebug(1, Form("Tracklet Det[%d] !OK", tracklet->GetDetector()));
568 continue;
569 }
e3cf3d02 570 Double_t x = tracklet->GetX();//GetX0();
41702fec 571 // reject tracklets which are not considered for inward refit
572 if(x > t.GetX()+fgkMaxStep) continue;
573
574 // append tracklet to track
575 t.SetTracklet(tracklet, index);
576
577 if (x < (t.GetX()-fgkMaxStep) && !PropagateToX(t, x+fgkMaxStep, fgkMaxStep)) break;
578 if (!AdjustSector(&t)) break;
579
580 // Start global position
581 Double_t xyz0[3];
582 t.GetXYZ(xyz0);
583
584 // End global position
585 Double_t alpha = t.GetAlpha(), y, z;
586 if (!t.GetProlongation(x,y,z)) break;
587 Double_t xyz1[3];
588 xyz1[0] = x * TMath::Cos(alpha) - y * TMath::Sin(alpha);
589 xyz1[1] = x * TMath::Sin(alpha) + y * TMath::Cos(alpha);
590 xyz1[2] = z;
591
51a23065 592 Double_t length = TMath::Sqrt(
593 (xyz0[0]-xyz1[0])*(xyz0[0]-xyz1[0]) +
594 (xyz0[1]-xyz1[1])*(xyz0[1]-xyz1[1]) +
595 (xyz0[2]-xyz1[2])*(xyz0[2]-xyz1[2])
596 );
597 if(length>0.){
598 // Get material budget
599 Double_t param[7];
600 if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param)<=0.) break;
601 Double_t xrho= param[0]*param[4];
602 Double_t xx0 = param[1]; // Get mean propagation parameters
603
604 // Propagate and update
605 t.PropagateTo(x, xx0, xrho);
606 if (!AdjustSector(&t)) break;
607 }
e3cf3d02 608 if(kStoreIn){
609 t.SetTrackHigh();
610 kStoreIn = kFALSE;
611 }
612
b72f4eaf 613 Double_t cov[3]; tracklet->GetCovAt(x, cov);
614 Double_t p[2] = { tracklet->GetY(), tracklet->GetZ()};
615 Double_t chi2 = ((AliExternalTrackParam)t).GetPredictedChi2(p, cov);
616 if (chi2 < 1e+10 && t.Update(p, cov, chi2)){
41702fec 617 nClustersExpected += tracklet->GetN();
618 }
619 }
620
a2fbb6ec 621 if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) > 1){
41702fec 622 Int_t index;
51a23065 623 for(int iplane=0; iplane<AliTRDgeometry::kNlayer; iplane++){
41702fec 624 AliTRDseedV1 *tracklet = GetTracklet(&t, iplane, index);
625 if(!tracklet) continue;
626 t.SetTracklet(tracklet, index);
627 }
628
a2fbb6ec 629 if(fkReconstructor->IsDebugStreaming()){
630 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
631 TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
632 AliTRDtrackV1 track(t);
633 track.SetOwner();
634 cstreamer << "FollowProlongation"
635 << "EventNumber=" << eventNumber
636 << "ncl=" << nClustersExpected
637 << "track.=" << &track
638 << "\n";
639 }
41702fec 640 }
41702fec 641 return nClustersExpected;
0906e73e 642
643}
644
645//_____________________________________________________________________________
646Int_t AliTRDtrackerV1::FollowBackProlongation(AliTRDtrackV1 &t)
647{
afa21247 648// Extrapolates/Build the TRD track in the TOF direction.
649//
650// Parameters
651// t : the TRD track which has to be extrapolated
652//
653// Output
654// number of clusters attached to the track
655//
656// Starting from current radial position of track <t> this function
657// extrapolates the track through the 6 TRD layers. The following steps
658// are being performed for each plane:
659// 1. Propagate track to the entrance of the next chamber:
660// - get chamber limits in the radial direction
661// - check crossing sectors
662// - check track inclination
663// - check track prolongation against boundary conditions (see exclusion boundaries on AliTRDgeometry::IsOnBoundary())
664// 2. Build tracklet (see AliTRDseed::AttachClusters() for details) for this layer if needed. If only
665// Kalman filter is needed and tracklets are already linked to the track this step is skipped.
666// 3. Fit tracklet using the information from the Kalman filter.
667// 4. Propagate and update track at reference radial position of the tracklet.
668// 5. Register tracklet with the tracker and track; update pulls monitoring.
669//
670// Observation
2a3191bb 671// 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:
672// - AliTRDtrackV1::kProlongation : track prolongation failed
673// - AliTRDtrackV1::kPropagation : track prolongation failed
674// - AliTRDtrackV1::kAdjustSector : failed during sector crossing
675// - AliTRDtrackV1::kSnp : too large bending
676// - AliTRDtrackV1::kTrackletInit : fail to initialize tracklet
677// - AliTRDtrackV1::kUpdate : fail to attach clusters or fit the tracklet
678// - AliTRDtrackV1::kUnknown : anything which is not covered before
afa21247 679// 2. By default the status of the track before first TRD update is saved.
680//
681// Debug level 2
682//
683// Author
684// Alexandru Bercuci <A.Bercuci@gsi.de>
685//
41702fec 686
eb2b4f91 687 Int_t n = 0;
688 Double_t driftLength = .5*AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick();
4d6aee34 689 AliTRDtrackingChamber *chamber = NULL;
41702fec 690
7c3eecb8 691 Int_t debugLevel = fkReconstructor->IsDebugStreaming() ? fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) : 0;
692 TTreeSRedirector *cstreamer = fkReconstructor->IsDebugStreaming() ? fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker) : 0x0;
693
4d6aee34 694 AliTRDseedV1 tracklet, *ptrTracklet = NULL;
181d2c97 695 // in case of stand alone tracking we store all the pointers to the tracklets in a temporary array
696 AliTRDseedV1 *tracklets[kNPlanes];
697 memset(tracklets, 0, sizeof(AliTRDseedV1 *) * kNPlanes);
698 for(Int_t ip = 0; ip < kNPlanes; ip++){
699 tracklets[ip] = t.GetTracklet(ip);
700 t.UnsetTracklet(ip);
701 }
b06a50a5 702 Bool_t kStoreIn(kTRUE), //
703 kPropagateIn(kTRUE),//
704 kUseTRD(fkReconstructor->GetRecoParam()->IsOverPtThreshold(t.Pt()));// use TRD measurment to update Kalman
e3cf3d02 705
053767a4 706 // Loop through the TRD layers
4d6aee34 707 TGeoHMatrix *matrix = NULL;
eb2b4f91 708 Double_t x, y, z;
709 for (Int_t ily=0, sm=-1, stk=-1, det=-1; ily < AliTRDgeometry::kNlayer; ily++) {
1bd708e3 710 AliDebug(2, Form("Propagate to x[%d] = %7.2f", ily, fR[ily]));
711
eb2b4f91 712 // rough estimate of the entry point
713 if (!t.GetProlongation(fR[ily], y, z)){
714 n=-1;
715 t.SetStatus(AliTRDtrackV1::kProlongation);
1bd708e3 716 AliDebug(4, Form("Failed Rough Prolongation to ly[%d] x[%7.2f] y[%7.2f] z[%7.2f]", ily, fR[ily], y, z));
eb2b4f91 717 break;
718 }
41702fec 719
eb2b4f91 720 // find sector / stack / detector
721 sm = t.GetSector();
722 // TODO cross check with y value !
723 stk = fGeom->GetStack(z, ily);
724 det = stk>=0 ? AliTRDgeometry::GetDetector(ily, stk, sm) : -1;
4d6aee34 725 matrix = det>=0 ? fGeom->GetClusterMatrix(det) : NULL;
1bd708e3 726 AliDebug(3, Form("Propagate to det[%3d]", det));
eb2b4f91 727
728 // check if supermodule/chamber is installed
729 if( !fGeom->GetSMstatus(sm) ||
730 stk<0. ||
731 fGeom->IsHole(ily, stk, sm) ||
732 !matrix ){
1bd708e3 733 AliDebug(4, Form("Missing Geometry ly[%d]. Guess radial position", ily));
eb2b4f91 734 // propagate to the default radial position
735 if(fR[ily] > (fgkMaxStep + t.GetX()) && !PropagateToX(t, fR[ily], fgkMaxStep)){
736 n=-1;
737 t.SetStatus(AliTRDtrackV1::kPropagation);
1bd708e3 738 AliDebug(4, "Failed Propagation [Missing Geometry]");
41702fec 739 break;
740 }
eb2b4f91 741 if(!AdjustSector(&t)){
742 n=-1;
743 t.SetStatus(AliTRDtrackV1::kAdjustSector);
1bd708e3 744 AliDebug(4, "Failed Adjust Sector [Missing Geometry]");
eb2b4f91 745 break;
746 }
747 if(TMath::Abs(t.GetSnp()) > fgkMaxSnp){
748 n=-1;
749 t.SetStatus(AliTRDtrackV1::kSnp);
1bd708e3 750 AliDebug(4, "Failed Max Snp [Missing Geometry]");
eb2b4f91 751 break;
752 }
753 t.SetStatus(AliTRDtrackV1::kGeometry, ily);
41702fec 754 continue;
755 }
e3cf3d02 756
eb2b4f91 757 // retrieve rotation matrix for the current chamber
758 Double_t loc[] = {AliTRDgeometry::AnodePos()- driftLength, 0., 0.};
759 Double_t glb[] = {0., 0., 0.};
760 matrix->LocalToMaster(loc, glb);
761
762 // Propagate to the radial distance of the current layer
763 x = glb[0] - fgkMaxStep;
764 if(x > (fgkMaxStep + t.GetX()) && !PropagateToX(t, x, fgkMaxStep)){
765 n=-1;
766 t.SetStatus(AliTRDtrackV1::kPropagation);
1bd708e3 767 AliDebug(4, Form("Failed Initial Propagation to x[%7.2f]", x));
eb2b4f91 768 break;
769 }
770 if(!AdjustSector(&t)){
771 n=-1;
772 t.SetStatus(AliTRDtrackV1::kAdjustSector);
1bd708e3 773 AliDebug(4, "Failed Adjust Sector Start");
eb2b4f91 774 break;
775 }
776 if(TMath::Abs(t.GetSnp()) > fgkMaxSnp) {
777 n=-1;
778 t.SetStatus(AliTRDtrackV1::kSnp);
1bd708e3 779 AliDebug(4, Form("Failed Max Snp[%f] MaxSnp[%f]", t.GetSnp(), fgkMaxSnp));
eb2b4f91 780 break;
781 }
4d6aee34 782 Bool_t doRecalculate = kFALSE;
eb2b4f91 783 if(sm != t.GetSector()){
784 sm = t.GetSector();
4d6aee34 785 doRecalculate = kTRUE;
eb2b4f91 786 }
787 if(stk != fGeom->GetStack(z, ily)){
788 stk = fGeom->GetStack(z, ily);
4d6aee34 789 doRecalculate = kTRUE;
eb2b4f91 790 }
4d6aee34 791 if(doRecalculate){
eb2b4f91 792 det = AliTRDgeometry::GetDetector(ily, stk, sm);
793 if(!(matrix = fGeom->GetClusterMatrix(det))){
794 t.SetStatus(AliTRDtrackV1::kGeometry, ily);
1bd708e3 795 AliDebug(4, Form("Failed Geometry Matrix ly[%d]", ily));
eb2b4f91 796 continue;
797 }
798 matrix->LocalToMaster(loc, glb);
799 x = glb[0] - fgkMaxStep;
800 }
801
802 // check if track is well inside fiducial volume
803 if (!t.GetProlongation(x+fgkMaxStep, y, z)) {
804 n=-1;
805 t.SetStatus(AliTRDtrackV1::kProlongation);
1bd708e3 806 AliDebug(4, Form("Failed Prolongation to x[%7.2f] y[%7.2f] z[%7.2f]", x+fgkMaxStep, y, z));
eb2b4f91 807 break;
808 }
809 if(fGeom->IsOnBoundary(det, y, z, .5)){
810 t.SetStatus(AliTRDtrackV1::kBoundary, ily);
1bd708e3 811 AliDebug(4, "Failed Track on Boundary");
eb2b4f91 812 continue;
813 }
814 // mark track as entering the FIDUCIAL volume of TRD
e3cf3d02 815 if(kStoreIn){
816 t.SetTrackLow();
817 kStoreIn = kFALSE;
818 }
b1957d3c 819
eb2b4f91 820 ptrTracklet = tracklets[ily];
821 if(!ptrTracklet){ // BUILD TRACKLET
1bd708e3 822 AliDebug(3, Form("Building tracklet det[%d]", det));
eb2b4f91 823 // check data in supermodule
824 if(!fTrSec[sm].GetNChambers()){
825 t.SetStatus(AliTRDtrackV1::kNoClusters, ily);
1bd708e3 826 AliDebug(4, "Failed NoClusters");
eb2b4f91 827 continue;
828 }
829 if(fTrSec[sm].GetX(ily) < 1.){
830 t.SetStatus(AliTRDtrackV1::kNoClusters, ily);
1bd708e3 831 AliDebug(4, "Failed NoX");
eb2b4f91 832 continue;
833 }
834
835 // check data in chamber
836 if(!(chamber = fTrSec[sm].GetChamber(stk, ily))){
837 t.SetStatus(AliTRDtrackV1::kNoClusters, ily);
1bd708e3 838 AliDebug(4, "Failed No Detector");
eb2b4f91 839 continue;
840 }
4d6aee34 841 if(chamber->GetNClusters() < fgNTimeBins*fkReconstructor->GetRecoParam() ->GetFindableClusters()){
eb2b4f91 842 t.SetStatus(AliTRDtrackV1::kNoClusters, ily);
1bd708e3 843 AliDebug(4, "Failed Not Enough Clusters in Detector");
eb2b4f91 844 continue;
845 }
846 // build tracklet
847 ptrTracklet = new(&tracklet) AliTRDseedV1(det);
4d6aee34 848 ptrTracklet->SetReconstructor(fkReconstructor);
eb2b4f91 849 ptrTracklet->SetKink(t.IsKink());
850 ptrTracklet->SetPadPlane(fGeom->GetPadPlane(ily, stk));
851 ptrTracklet->SetX0(glb[0]+driftLength);
852 if(!tracklet.Init(&t)){
853 n=-1;
854 t.SetStatus(AliTRDtrackV1::kTrackletInit);
1bd708e3 855 AliDebug(4, "Failed Tracklet Init");
eb2b4f91 856 break;
857 }
858 if(!tracklet.AttachClusters(chamber, kTRUE)){
859 t.SetStatus(AliTRDtrackV1::kNoAttach, ily);
7c3eecb8 860 if(debugLevel>3){
861 AliTRDseedV1 trackletCp(*ptrTracklet);
862 UChar_t status(t.GetStatusTRD(ily));
863 (*cstreamer) << "FollowBackProlongation2"
864 <<"status=" << status
865 <<"tracklet.=" << &trackletCp
866 << "\n";
867 }
1bd708e3 868 AliDebug(4, "Failed Attach Clusters");
eb2b4f91 869 continue;
870 }
1bd708e3 871 AliDebug(3, Form("Number of Clusters in Tracklet: %d", tracklet.GetN()));
4d6aee34 872 if(tracklet.GetN() < fgNTimeBins*fkReconstructor->GetRecoParam() ->GetFindableClusters()){
eb2b4f91 873 t.SetStatus(AliTRDtrackV1::kNoClustersTracklet, ily);
7c3eecb8 874 if(debugLevel>3){
875 AliTRDseedV1 trackletCp(*ptrTracklet);
876 UChar_t status(t.GetStatusTRD(ily));
877 (*cstreamer) << "FollowBackProlongation2"
878 <<"status=" << status
879 <<"tracklet.=" << &trackletCp
880 << "\n";
881 }
1bd708e3 882 AliDebug(4, "Failed N Clusters Attached");
eb2b4f91 883 continue;
884 }
885 ptrTracklet->UpdateUsed();
0217fcd0 886 } else AliDebug(2, Form("Use external tracklet ly[%d]", ily));
eb2b4f91 887 // propagate track to the radial position of the tracklet
888 ptrTracklet->UseClusters(); // TODO ? do we need this here ?
889 // fit tracklet no tilt correction
890 if(!ptrTracklet->Fit(kFALSE)){
891 t.SetStatus(AliTRDtrackV1::kNoFit, ily);
1bd708e3 892 AliDebug(4, "Failed Tracklet Fit");
eb2b4f91 893 continue;
894 }
895 x = ptrTracklet->GetX(); //GetX0();
896 if(x > (fgkMaxStep + t.GetX()) && !PropagateToX(t, x, fgkMaxStep)) {
897 n=-1;
898 t.SetStatus(AliTRDtrackV1::kPropagation);
1bd708e3 899 AliDebug(4, Form("Failed Propagation to Tracklet x[%7.2f]", x));
eb2b4f91 900 break;
901 }
902 if(!AdjustSector(&t)) {
903 n=-1;
904 t.SetStatus(AliTRDtrackV1::kAdjustSector);
1bd708e3 905 AliDebug(4, "Failed Adjust Sector");
eb2b4f91 906 break;
41702fec 907 }
eb2b4f91 908 if(TMath::Abs(t.GetSnp()) > fgkMaxSnp) {
909 n=-1;
910 t.SetStatus(AliTRDtrackV1::kSnp);
1bd708e3 911 AliDebug(4, Form("Failed Max Snp[%f] MaxSnp[%f]", t.GetSnp(), fgkMaxSnp));
eb2b4f91 912 break;
913 }
81a6494d 914 if(kPropagateIn){
915 t.SetTrackLow();
916 kPropagateIn = kFALSE;
917 }
b72f4eaf 918 Double_t cov[3]; ptrTracklet->GetCovAt(x, cov);
919 Double_t p[2] = { ptrTracklet->GetY(), ptrTracklet->GetZ()};
920 Double_t chi2 = ((AliExternalTrackParam)t).GetPredictedChi2(p, cov);
6e39bde4 921 // update Kalman with the TRD measurement
b72f4eaf 922 if(chi2>1e+10){ // TODO
eb2b4f91 923 t.SetStatus(AliTRDtrackV1::kChi2, ily);
7c3eecb8 924 if(debugLevel > 2){
925 UChar_t status(t.GetStatusTRD());
926 AliTRDseedV1 trackletCp(*ptrTracklet);
927 AliTRDtrackV1 trackCp(t);
928 trackCp.SetOwner();
929 (*cstreamer) << "FollowBackProlongation1"
930 << "status=" << status
931 << "tracklet.=" << &trackletCp
932 << "track.=" << &trackCp
933 << "\n";
934 }
1bd708e3 935 AliDebug(4, Form("Failed Chi2[%f]", chi2));
eb2b4f91 936 continue;
937 }
b06a50a5 938 if(!t.Update(p, cov, chi2, kUseTRD)) {
eb2b4f91 939 n=-1;
940 t.SetStatus(AliTRDtrackV1::kUpdate);
7c3eecb8 941 if(debugLevel > 2){
942 UChar_t status(t.GetStatusTRD());
943 AliTRDseedV1 trackletCp(*ptrTracklet);
944 AliTRDtrackV1 trackCp(t);
945 trackCp.SetOwner();
946 (*cstreamer) << "FollowBackProlongation1"
947 << "status=" << status
948 << "tracklet.=" << &trackletCp
949 << "track.=" << &trackCp
950 << "\n";
951 }
1bd708e3 952 AliDebug(4, Form("Failed Track Update @ y[%7.2f] z[%7.2f] s2y[%f] s2z[%f] covyz[%f]", p[0], p[1], cov[0], cov[2], cov[1]));
eb2b4f91 953 break;
954 }
b72f4eaf 955 // fill residuals ?!
956 AliTracker::FillResiduals(&t, p, cov, ptrTracklet->GetVolumeId());
957
eb2b4f91 958
959 // load tracklet to the tracker
16cca13f 960 ptrTracklet->Update(&t);
eb2b4f91 961 ptrTracklet = SetTracklet(ptrTracklet);
17896e82 962 Int_t index(fTracklets->GetEntriesFast()-1);
963 t.SetTracklet(ptrTracklet, index);
eb2b4f91 964 n += ptrTracklet->GetN();
17896e82 965 AliDebug(2, Form("Setting Tracklet[%d] @ Idx[%d]", ily, index));
eb2b4f91 966
41702fec 967 // Reset material budget if 2 consecutive gold
eb2b4f91 968// if(ilayer>0 && t.GetTracklet(ilayer-1) && ptrTracklet->GetN() + t.GetTracklet(ilayer-1)->GetN() > 20) t.SetBudget(2, 0.);
41702fec 969
970 // Make backup of the track until is gold
971 // TO DO update quality check of the track.
972 // consider comparison with fTimeBinsRange
973 Float_t ratio0 = ptrTracklet->GetN() / Float_t(fgNTimeBins);
974 //Float_t ratio1 = Float_t(t.GetNumberOfClusters()+1) / Float_t(t.GetNExpected()+1);
41702fec 975
eb2b4f91 976 if( (chi2 < 18.0) &&
41702fec 977 (ratio0 > 0.8) &&
978 //(ratio1 > 0.6) &&
979 //(ratio0+ratio1 > 1.5) &&
980 (t.GetNCross() == 0) &&
981 (TMath::Abs(t.GetSnp()) < 0.85) &&
e3cf3d02 982 (t.GetNumberOfClusters() > 20)){
983 t.MakeBackupTrack();
984 }
053767a4 985 } // end layers loop
eb2b4f91 986 //printf("clusters[%d] chi2[%f] x[%f] status[%d ", n, t.GetChi2(), t.GetX(), t.GetStatusTRD());
987 //for(int i=0; i<6; i++) printf("%d ", t.GetStatusTRD(i)); printf("]\n");
41702fec 988
7c3eecb8 989 if(debugLevel > 1){
41702fec 990 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
eb2b4f91 991 AliTRDtrackV1 track(t);
992 track.SetOwner();
7c3eecb8 993 (*cstreamer) << "FollowBackProlongation0"
eb2b4f91 994 << "EventNumber=" << eventNumber
995 << "ncl=" << n
996 << "track.=" << &track
41702fec 997 << "\n";
998 }
999
eb2b4f91 1000 return n;
0906e73e 1001}
1002
eb38ed55 1003//_________________________________________________________________________
4d6aee34 1004Float_t AliTRDtrackerV1::FitRieman(AliTRDseedV1 *tracklets, Double_t *chi2, Int_t *const planes){
41702fec 1005 //
1006 // Fits a Riemann-circle to the given points without tilting pad correction.
1007 // The fit is performed using an instance of the class AliRieman (equations
1008 // and transformations see documentation of this class)
1009 // Afterwards all the tracklets are Updated
1010 //
1011 // Parameters: - Array of tracklets (AliTRDseedV1)
1012 // - Storage for the chi2 values (beginning with direction z)
1013 // - Seeding configuration
1014 // Output: - The curvature
1015 //
1016 AliRieman *fitter = AliTRDtrackerV1::GetRiemanFitter();
1017 fitter->Reset();
1018 Int_t allplanes[] = {0, 1, 2, 3, 4, 5};
1019 Int_t *ppl = &allplanes[0];
1020 Int_t maxLayers = 6;
1021 if(planes){
1022 maxLayers = 4;
1023 ppl = planes;
1024 }
1025 for(Int_t il = 0; il < maxLayers; il++){
1026 if(!tracklets[ppl[il]].IsOK()) continue;
e3cf3d02 1027 fitter->AddPoint(tracklets[ppl[il]].GetX0(), tracklets[ppl[il]].GetYfit(0), tracklets[ppl[il]].GetZfit(0),1,10);
41702fec 1028 }
1029 fitter->Update();
1030 // Set the reference position of the fit and calculate the chi2 values
1031 memset(chi2, 0, sizeof(Double_t) * 2);
1032 for(Int_t il = 0; il < maxLayers; il++){
1033 // Reference positions
1034 tracklets[ppl[il]].Init(fitter);
1035
1036 // chi2
1037 if((!tracklets[ppl[il]].IsOK()) && (!planes)) continue;
1038 chi2[0] += tracklets[ppl[il]].GetChi2Y();
1039 chi2[1] += tracklets[ppl[il]].GetChi2Z();
1040 }
1041 return fitter->GetC();
eb38ed55 1042}
1043
1044//_________________________________________________________________________
1045void AliTRDtrackerV1::FitRieman(AliTRDcluster **seedcl, Double_t chi2[2])
1046{
41702fec 1047 //
1048 // Performs a Riemann helix fit using the seedclusters as spacepoints
1049 // Afterwards the chi2 values are calculated and the seeds are updated
1050 //
1051 // Parameters: - The four seedclusters
1052 // - The tracklet array (AliTRDseedV1)
1053 // - The seeding configuration
1054 // - Chi2 array
1055 //
1056 // debug level 2
1057 //
1058 AliRieman *fitter = AliTRDtrackerV1::GetRiemanFitter();
1059 fitter->Reset();
a3743898 1060 for(Int_t i = 0; i < 4; i++){
a3743898 1061 fitter->AddPoint(seedcl[i]->GetX(), seedcl[i]->GetY(), seedcl[i]->GetZ(), 1., 10.);
1062 }
41702fec 1063 fitter->Update();
1064
1065
1066 // Update the seed and calculated the chi2 value
1067 chi2[0] = 0; chi2[1] = 0;
1068 for(Int_t ipl = 0; ipl < kNSeedPlanes; ipl++){
1069 // chi2
1070 chi2[0] += (seedcl[ipl]->GetZ() - fitter->GetZat(seedcl[ipl]->GetX())) * (seedcl[ipl]->GetZ() - fitter->GetZat(seedcl[ipl]->GetX()));
1071 chi2[1] += (seedcl[ipl]->GetY() - fitter->GetYat(seedcl[ipl]->GetX())) * (seedcl[ipl]->GetY() - fitter->GetYat(seedcl[ipl]->GetX()));
1072 }
eb38ed55 1073}
1074
1075
1076//_________________________________________________________________________
1077Float_t AliTRDtrackerV1::FitTiltedRiemanConstraint(AliTRDseedV1 *tracklets, Double_t zVertex)
1078{
41702fec 1079 //
1080 // Fits a helix to the clusters. Pad tilting is considered. As constraint it is
1081 // assumed that the vertex position is set to 0.
1082 // This method is very usefull for high-pt particles
1083 // Basis for the fit: (x - x0)^2 + (y - y0)^2 - R^2 = 0
1084 // x0, y0: Center of the circle
1085 // Measured y-position: ymeas = y - tan(phiT)(zc - zt)
1086 // zc: center of the pad row
1087 // Equation which has to be fitted (after transformation):
1088 // a + b * u + e * v + 2*(ymeas + tan(phiT)(z - zVertex))*t = 0
1089 // Transformation:
1090 // t = 1/(x^2 + y^2)
1091 // u = 2 * x * t
1092 // v = 2 * x * tan(phiT) * t
1093 // Parameters in the equation:
1094 // a = -1/y0, b = x0/y0, e = dz/dx
1095 //
1096 // The Curvature is calculated by the following equation:
1097 // - curv = a/Sqrt(b^2 + 1) = 1/R
1098 // Parameters: - the 6 tracklets
1099 // - the Vertex constraint
1100 // Output: - the Chi2 value of the track
1101 //
1102 // debug level 5
1103 //
1104
1105 TLinearFitter *fitter = GetTiltedRiemanFitterConstraint();
1106 fitter->StoreData(kTRUE);
1107 fitter->ClearPoints();
4d6aee34 1108 AliTRDcluster *cl = NULL;
41702fec 1109
1110 Float_t x, y, z, w, t, error, tilt;
1111 Double_t uvt[2];
1112 Int_t nPoints = 0;
053767a4 1113 for(Int_t ilr = 0; ilr < AliTRDgeometry::kNlayer; ilr++){
1114 if(!tracklets[ilr].IsOK()) continue;
8d2bec9e 1115 for(Int_t itb = 0; itb < AliTRDseedV1::kNclusters; itb++){
053767a4 1116 if(!tracklets[ilr].IsUsable(itb)) continue;
1117 cl = tracklets[ilr].GetClusters(itb);
1742f24c 1118 if(!cl->IsInChamber()) continue;
41702fec 1119 x = cl->GetX();
1120 y = cl->GetY();
1121 z = cl->GetZ();
053767a4 1122 tilt = tracklets[ilr].GetTilt();
41702fec 1123 // Transformation
1124 t = 1./(x * x + y * y);
1125 uvt[0] = 2. * x * t;
1126 uvt[1] = 2. * x * t * tilt ;
1127 w = 2. * (y + tilt * (z - zVertex)) * t;
78b7d24c 1128 error = 2. * TMath::Sqrt(cl->GetSigmaY2()+tilt*tilt*cl->GetSigmaZ2()) * t;
41702fec 1129 fitter->AddPoint(uvt, w, error);
1130 nPoints++;
1131 }
1132 }
e17f4785 1133 fitter->Eval();
41702fec 1134
1135 // Calculate curvature
1136 Double_t a = fitter->GetParameter(0);
1137 Double_t b = fitter->GetParameter(1);
1138 Double_t curvature = a/TMath::Sqrt(b*b + 1);
1139
1140 Float_t chi2track = fitter->GetChisquare()/Double_t(nPoints);
1141 for(Int_t ip = 0; ip < AliTRDtrackerV1::kNPlanes; ip++)
e3cf3d02 1142 tracklets[ip].SetC(curvature);
41702fec 1143
a2fbb6ec 1144/* if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker()) >= 5){
41702fec 1145 //Linear Model on z-direction
1146 Double_t xref = CalculateReferenceX(tracklets); // Relative to the middle of the stack
1147 Double_t slope = fitter->GetParameter(2);
1148 Double_t zref = slope * xref;
1149 Float_t chi2Z = CalculateChi2Z(tracklets, zref, slope, xref);
1150 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
1151 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
4d6aee34 1152 TTreeSRedirector &treeStreamer = *fkReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
41702fec 1153 treeStreamer << "FitTiltedRiemanConstraint"
1154 << "EventNumber=" << eventNumber
1155 << "CandidateNumber=" << candidateNumber
1156 << "Curvature=" << curvature
1157 << "Chi2Track=" << chi2track
1158 << "Chi2Z=" << chi2Z
1159 << "zref=" << zref
1160 << "\n";
3a039a31 1161 }*/
41702fec 1162 return chi2track;
eb38ed55 1163}
1164
1165//_________________________________________________________________________
1166Float_t AliTRDtrackerV1::FitTiltedRieman(AliTRDseedV1 *tracklets, Bool_t sigError)
1167{
41702fec 1168 //
1169 // Performs a Riemann fit taking tilting pad correction into account
1170 // The equation of a Riemann circle, where the y position is substituted by the
1171 // measured y-position taking pad tilting into account, has to be transformed
1172 // into a 4-dimensional hyperplane equation
1173 // Riemann circle: (x-x0)^2 + (y-y0)^2 -R^2 = 0
1174 // Measured y-Position: ymeas = y - tan(phiT)(zc - zt)
1175 // zc: center of the pad row
1176 // zt: z-position of the track
1177 // The z-position of the track is assumed to be linear dependent on the x-position
1178 // Transformed equation: a + b * u + c * t + d * v + e * w - 2 * (ymeas + tan(phiT) * zc) * t = 0
1179 // Transformation: u = 2 * x * t
1180 // v = 2 * tan(phiT) * t
1181 // w = 2 * tan(phiT) * (x - xref) * t
1182 // t = 1 / (x^2 + ymeas^2)
1183 // Parameters: a = -1/y0
1184 // b = x0/y0
1185 // c = (R^2 -x0^2 - y0^2)/y0
1186 // d = offset
1187 // e = dz/dx
1188 // If the offset respectively the slope in z-position is impossible, the parameters are fixed using
1189 // results from the simple riemann fit. Afterwards the fit is redone.
1190 // The curvature is calculated according to the formula:
1191 // curv = a/(1 + b^2 + c*a) = 1/R
1192 //
1193 // Paramters: - Array of tracklets (connected to the track candidate)
1194 // - Flag selecting the error definition
1195 // Output: - Chi2 values of the track (in Parameter list)
1196 //
1197 TLinearFitter *fitter = GetTiltedRiemanFitter();
1198 fitter->StoreData(kTRUE);
1199 fitter->ClearPoints();
1200 AliTRDLeastSquare zfitter;
4d6aee34 1201 AliTRDcluster *cl = NULL;
41702fec 1202
1203 Double_t xref = CalculateReferenceX(tracklets);
6e39bde4 1204 Double_t x, y, z, t, tilt, dx, w, we, erry, errz;
1205 Double_t uvt[4], sumPolY[5], sumPolZ[3];
1206 memset(sumPolY, 0, sizeof(Double_t) * 5);
1207 memset(sumPolZ, 0, sizeof(Double_t) * 3);
41702fec 1208 Int_t nPoints = 0;
1209 // Containers for Least-square fitter
1210 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1211 if(!tracklets[ipl].IsOK()) continue;
ed15ef4f 1212 tilt = tracklets[ipl].GetTilt();
8d2bec9e 1213 for(Int_t itb = 0; itb < AliTRDseedV1::kNclusters; itb++){
41702fec 1214 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1742f24c 1215 if(!cl->IsInChamber()) continue;
41702fec 1216 if (!tracklets[ipl].IsUsable(itb)) continue;
1217 x = cl->GetX();
1218 y = cl->GetY();
1219 z = cl->GetZ();
41702fec 1220 dx = x - xref;
1221 // Transformation
1222 t = 1./(x*x + y*y);
1223 uvt[0] = 2. * x * t;
1224 uvt[1] = t;
1225 uvt[2] = 2. * tilt * t;
1226 uvt[3] = 2. * tilt * dx * t;
1227 w = 2. * (y + tilt*z) * t;
1228 // error definition changes for the different calls
1229 we = 2. * t;
78b7d24c 1230 we *= sigError ? TMath::Sqrt(cl->GetSigmaY2()+tilt*tilt*cl->GetSigmaZ2()) : 0.2;
41702fec 1231 fitter->AddPoint(uvt, w, we);
1232 zfitter.AddPoint(&x, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
6e39bde4 1233 // adding points for covariance matrix estimation
1234 erry = 1./(TMath::Sqrt(cl->GetSigmaY2()) + 0.1); // 0.1 is a systematic error (due to misalignment and miscalibration)
1235 erry *= erry;
1236 errz = 1./cl->GetSigmaZ2();
1237 for(Int_t ipol = 0; ipol < 5; ipol++){
1238 sumPolY[ipol] += erry;
1239 erry *= x;
1240 if(ipol < 3){
1241 sumPolZ[ipol] += errz;
1242 errz *= x;
1243 }
1244 }
41702fec 1245 nPoints++;
1246 }
1247 }
e17f4785 1248 fitter->Eval();
41702fec 1249 zfitter.Eval();
1250
1251 Double_t offset = fitter->GetParameter(3);
1252 Double_t slope = fitter->GetParameter(4);
1253
1254 // Linear fitter - not possible to make boundaries
1255 // Do not accept non possible z and dzdx combinations
1256 Bool_t acceptablez = kTRUE;
1257 Double_t zref = 0.0;
1258 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
1259 if(!tracklets[iLayer].IsOK()) continue;
1260 zref = offset + slope * (tracklets[iLayer].GetX0() - xref);
e3cf3d02 1261 if (TMath::Abs(tracklets[iLayer].GetZfit(0) - zref) > tracklets[iLayer].GetPadLength() * 0.5 + 1.0)
41702fec 1262 acceptablez = kFALSE;
1263 }
1264 if (!acceptablez) {
1265 Double_t dzmf = zfitter.GetFunctionParameter(1);
1266 Double_t zmf = zfitter.GetFunctionValue(&xref);
1267 fgTiltedRieman->FixParameter(3, zmf);
1268 fgTiltedRieman->FixParameter(4, dzmf);
e17f4785 1269 fitter->Eval();
41702fec 1270 fitter->ReleaseParameter(3);
1271 fitter->ReleaseParameter(4);
1272 offset = fitter->GetParameter(3);
1273 slope = fitter->GetParameter(4);
1274 }
1275
1276 // Calculate Curvarture
1277 Double_t a = fitter->GetParameter(0);
1278 Double_t b = fitter->GetParameter(1);
1279 Double_t c = fitter->GetParameter(2);
1280 Double_t curvature = 1.0 + b*b - c*a;
1281 if (curvature > 0.0)
1282 curvature = a / TMath::Sqrt(curvature);
1283
1284 Double_t chi2track = fitter->GetChisquare()/Double_t(nPoints);
1285
6e39bde4 1286 // Prepare error calculation
1287 TMatrixD covarPolY(3,3);
1288 covarPolY(0,0) = sumPolY[0]; covarPolY(1,1) = sumPolY[2]; covarPolY(2,2) = sumPolY[4];
1289 covarPolY(0,1) = covarPolY(1,0) = sumPolY[1];
1290 covarPolY(0,2) = covarPolY(2,0) = sumPolY[2];
1291 covarPolY(2,1) = covarPolY(1,2) = sumPolY[3];
1292 covarPolY.Invert();
1293 TMatrixD covarPolZ(2,2);
1294 covarPolZ(0,0) = sumPolZ[0]; covarPolZ(1,1) = sumPolZ[2];
1295 covarPolZ(1,0) = covarPolZ(0,1) = sumPolZ[1];
1296 covarPolZ.Invert();
1297
41702fec 1298 // Update the tracklets
6e39bde4 1299 Double_t x1, dy, dz;
1300 Double_t cov[15];
1301 memset(cov, 0, sizeof(Double_t) * 15);
41702fec 1302 for(Int_t iLayer = 0; iLayer < AliTRDtrackerV1::kNPlanes; iLayer++) {
1303
1304 x = tracklets[iLayer].GetX0();
6e39bde4 1305 x1 = x - xref;
41702fec 1306 y = 0;
1307 z = 0;
1308 dy = 0;
1309 dz = 0;
6e39bde4 1310 memset(cov, 0, sizeof(Double_t) * 3);
1311 TMatrixD transform(3,3);
1312 transform(0,0) = 1;
1313 transform(0,1) = x;
1314 transform(0,2) = x*x;
1315 transform(1,1) = 1;
1316 transform(1,2) = x;
1317 transform(2,2) = 1;
1318 TMatrixD covariance(transform, TMatrixD::kMult, covarPolY);
1319 covariance *= transform.T();
1320 TMatrixD transformZ(2,2);
1321 transformZ(0,0) = transformZ(1,1) = 1;
1322 transformZ(0,1) = x;
1323 TMatrixD covarZ(transformZ, TMatrixD::kMult, covarPolZ);
1324 covarZ *= transformZ.T();
41702fec 1325 // y: R^2 = (x - x0)^2 + (y - y0)^2
1326 // => y = y0 +/- Sqrt(R^2 - (x - x0)^2)
1327 // R = Sqrt() = 1/Curvature
1328 // => y = y0 +/- Sqrt(1/Curvature^2 - (x - x0)^2)
1329 Double_t res = (x * a + b); // = (x - x0)/y0
1330 res *= res;
1331 res = 1.0 - c * a + b * b - res; // = (R^2 - (x - x0)^2)/y0^2
1332 if (res >= 0) {
1333 res = TMath::Sqrt(res);
1334 y = (1.0 - res) / a;
1335 }
6e39bde4 1336 cov[0] = covariance(0,0);
1337 cov[2] = covarZ(0,0);
1338 cov[1] = 0.;
41702fec 1339
1340 // dy: R^2 = (x - x0)^2 + (y - y0)^2
1341 // => y = +/- Sqrt(R^2 - (x - x0)^2) + y0
1342 // => dy/dx = (x - x0)/Sqrt(R^2 - (x - x0)^2)
1343 // Curvature: cr = 1/R = a/Sqrt(1 + b^2 - c*a)
1344 // => dy/dx = (x - x0)/(1/(cr^2) - (x - x0)^2)
1345 Double_t x0 = -b / a;
1346 if (-c * a + b * b + 1 > 0) {
1347 if (1.0/(curvature * curvature) - (x - x0) * (x - x0) > 0.0) {
6e39bde4 1348 Double_t yderiv = (x - x0) / TMath::Sqrt(1.0/(curvature * curvature) - (x - x0) * (x - x0));
1349 if (a < 0) yderiv *= -1.0;
1350 dy = yderiv;
41702fec 1351 }
1352 }
1353 z = offset + slope * (x - xref);
1354 dz = slope;
1355 tracklets[iLayer].SetYref(0, y);
1356 tracklets[iLayer].SetYref(1, dy);
1357 tracklets[iLayer].SetZref(0, z);
1358 tracklets[iLayer].SetZref(1, dz);
1359 tracklets[iLayer].SetC(curvature);
6e39bde4 1360 tracklets[iLayer].SetCovRef(cov);
41702fec 1361 tracklets[iLayer].SetChi2(chi2track);
1362 }
1363
a2fbb6ec 1364/* if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) >=5){
1365 TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
41702fec 1366 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
1367 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
1368 Double_t chi2z = CalculateChi2Z(tracklets, offset, slope, xref);
1369 cstreamer << "FitTiltedRieman0"
1370 << "EventNumber=" << eventNumber
1371 << "CandidateNumber=" << candidateNumber
1372 << "xref=" << xref
1373 << "Chi2Z=" << chi2z
1374 << "\n";
3a039a31 1375 }*/
41702fec 1376 return chi2track;
eb38ed55 1377}
1378
3b57a3f7 1379
9e333711 1380//____________________________________________________________________
6e4d4425 1381Double_t AliTRDtrackerV1::FitLine(const AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t err, Int_t np, AliTrackPoint *points)
9e333711 1382{
4d6aee34 1383 //
1384 // Fit track with a staight line
1385 // Fills an AliTrackPoint array with np points
1386 // Function should be used to refit tracks when no magnetic field was on
1387 //
9e333711 1388 AliTRDLeastSquare yfitter, zfitter;
4d6aee34 1389 AliTRDcluster *cl = NULL;
9e333711 1390
4d6aee34 1391 AliTRDseedV1 work[kNPlanes], *tracklet = NULL;
9e333711 1392 if(!tracklets){
1393 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1394 if(!(tracklet = track->GetTracklet(ipl))) continue;
1395 if(!tracklet->IsOK()) continue;
1396 new(&work[ipl]) AliTRDseedV1(*tracklet);
1397 }
1398 tracklets = &work[0];
1399 }
1400
1401 Double_t xref = CalculateReferenceX(tracklets);
1402 Double_t x, y, z, dx, ye, yr, tilt;
1403 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1404 if(!tracklets[ipl].IsOK()) continue;
1405 for(Int_t itb = 0; itb < fgNTimeBins; itb++){
1406 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1407 if (!tracklets[ipl].IsUsable(itb)) continue;
1408 x = cl->GetX();
1409 z = cl->GetZ();
1410 dx = x - xref;
1411 zfitter.AddPoint(&dx, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
1412 }
1413 }
1414 zfitter.Eval();
1415 Double_t z0 = zfitter.GetFunctionParameter(0);
1416 Double_t dzdx = zfitter.GetFunctionParameter(1);
1417 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1418 if(!tracklets[ipl].IsOK()) continue;
1419 for(Int_t itb = 0; itb < fgNTimeBins; itb++){
1420 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1421 if (!tracklets[ipl].IsUsable(itb)) continue;
1422 x = cl->GetX();
1423 y = cl->GetY();
1424 z = cl->GetZ();
1425 tilt = tracklets[ipl].GetTilt();
1426 dx = x - xref;
1427 yr = y + tilt*(z - z0 - dzdx*dx);
1428 // error definition changes for the different calls
1429 ye = tilt*TMath::Sqrt(cl->GetSigmaZ2());
1430 ye += err ? tracklets[ipl].GetSigmaY() : 0.2;
1431 yfitter.AddPoint(&dx, yr, ye);
1432 }
1433 }
1434 yfitter.Eval();
1435 Double_t y0 = yfitter.GetFunctionParameter(0);
1436 Double_t dydx = yfitter.GetFunctionParameter(1);
1437 Double_t chi2 = 0.;//yfitter.GetChisquare()/Double_t(nPoints);
1438
1439 //update track points array
1440 if(np && points){
1441 Float_t xyz[3];
1442 for(int ip=0; ip<np; ip++){
1443 points[ip].GetXYZ(xyz);
1444 xyz[1] = y0 + dydx * (xyz[0] - xref);
1445 xyz[2] = z0 + dzdx * (xyz[0] - xref);
1446 points[ip].SetXYZ(xyz);
1447 }
1448 }
1449 return chi2;
1450}
1451
1452
3b57a3f7 1453//_________________________________________________________________________
6e4d4425 1454Double_t AliTRDtrackerV1::FitRiemanTilt(const AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t sigError, Int_t np, AliTrackPoint *points)
3b57a3f7 1455{
0fa1a8ee 1456//
1457// Performs a Riemann fit taking tilting pad correction into account
1458//
1459// Paramters: - Array of tracklets (connected to the track candidate)
1460// - Flag selecting the error definition
1461// Output: - Chi2 values of the track (in Parameter list)
1462//
1463// The equations which has to be solved simultaneously are:
1464// BEGIN_LATEX
1465// R^{2} = (x-x_{0})^{2} + (y^{*}-y_{0})^{2}
1466// y^{*} = y - tg(h)(z - z_{t})
1467// z_{t} = z_{0}+dzdx*(x-x_{r})
1468// END_LATEX
1469// with (x, y, z) the coordinate of the cluster, (x_0, y_0, z_0) the coordinate of the center of the Riemann circle,
1470// R its radius, x_r a constant refrence radial position in the middle of the TRD stack and dzdx the slope of the
1471// track in the x-z plane. Using the following transformations
1472// BEGIN_LATEX
1473// t = 1 / (x^{2} + y^{2})
1474// u = 2 * x * t
1475// v = 2 * tan(h) * t
1476// w = 2 * tan(h) * (x - x_{r}) * t
1477// END_LATEX
1478// One gets the following linear equation
1479// BEGIN_LATEX
1480// a + b * u + c * t + d * v + e * w = 2 * (y + tg(h) * z) * t
1481// END_LATEX
1482// where the coefficients have the following meaning
1483// BEGIN_LATEX
1484// a = -1/y_{0}
1485// b = x_{0}/y_{0}
1486// c = (R^{2} -x_{0}^{2} - y_{0}^{2})/y_{0}
1487// d = z_{0}
1488// e = dz/dx
1489// END_LATEX
1490// The error calculation for the free term is thus
1491// BEGIN_LATEX
1492// #sigma = 2 * #sqrt{#sigma^{2}_{y} + (tilt corr ...) + tg^{2}(h) * #sigma^{2}_{z}} * t
1493// END_LATEX
1494//
1495// From this simple model one can compute chi^2 estimates and a rough approximation of pt from the curvature according
1496// to the formula:
1497// BEGIN_LATEX
1498// C = 1/R = a/(1 + b^{2} + c*a)
1499// END_LATEX
1500//
1501// Authors
1502// M.Ivanov <M.Ivanov@gsi.de>
1503// A.Bercuci <A.Bercuci@gsi.de>
1504// M.Fasel <M.Fasel@gsi.de>
1505
41702fec 1506 TLinearFitter *fitter = GetTiltedRiemanFitter();
1507 fitter->StoreData(kTRUE);
1508 fitter->ClearPoints();
1509 AliTRDLeastSquare zfitter;
4d6aee34 1510 AliTRDcluster *cl = NULL;
3b57a3f7 1511
4d6aee34 1512 AliTRDseedV1 work[kNPlanes], *tracklet = NULL;
3b57a3f7 1513 if(!tracklets){
1514 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1515 if(!(tracklet = track->GetTracklet(ipl))) continue;
1516 if(!tracklet->IsOK()) continue;
1517 new(&work[ipl]) AliTRDseedV1(*tracklet);
1518 }
1519 tracklets = &work[0];
1520 }
1521
41702fec 1522 Double_t xref = CalculateReferenceX(tracklets);
352cef8f 1523 AliDebugGeneral("AliTRDtrackerV1::FitRiemanTilt()", 4,
1524 Form("\nx0[(0)%6.2f (1)%6.2f (2)%6.2f (3)%6.2f (4)%6.2f (5)%6.2f] xref[%6.2f]", tracklets[0].GetX0(), tracklets[1].GetX0(), tracklets[2].GetX0(), tracklets[3].GetX0(), tracklets[4].GetX0(), tracklets[5].GetX0(), xref));
41702fec 1525 Double_t x, y, z, t, tilt, dx, w, we;
1526 Double_t uvt[4];
1527 Int_t nPoints = 0;
1528 // Containers for Least-square fitter
1529 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1530 if(!tracklets[ipl].IsOK()) continue;
8d2bec9e 1531 for(Int_t itb = 0; itb < AliTRDseedV1::kNclusters; itb++){
41702fec 1532 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
352cef8f 1533 //if (!tracklets[ipl].IsUsable(itb)) continue;
41702fec 1534 x = cl->GetX();
1535 y = cl->GetY();
1536 z = cl->GetZ();
1537 tilt = tracklets[ipl].GetTilt();
1538 dx = x - xref;
1539 // Transformation
1540 t = 1./(x*x + y*y);
1541 uvt[0] = 2. * x * t;
1542 uvt[1] = t;
1543 uvt[2] = 2. * tilt * t;
1544 uvt[3] = 2. * tilt * dx * t;
1545 w = 2. * (y + tilt*z) * t;
1546 // error definition changes for the different calls
1547 we = 2. * t;
f29f13a6 1548 we *= sigError ? TMath::Sqrt(cl->GetSigmaY2()) : 0.2;
41702fec 1549 fitter->AddPoint(uvt, w, we);
1550 zfitter.AddPoint(&x, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
1551 nPoints++;
1552 }
1553 }
aec26713 1554 if(fitter->Eval()) return 1.E10;
1555
41702fec 1556 Double_t z0 = fitter->GetParameter(3);
1557 Double_t dzdx = fitter->GetParameter(4);
3b57a3f7 1558
1559
1560 // Linear fitter - not possible to make boundaries
1561 // Do not accept non possible z and dzdx combinations
1562 Bool_t accept = kTRUE;
1563 Double_t zref = 0.0;
1564 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
1565 if(!tracklets[iLayer].IsOK()) continue;
1566 zref = z0 + dzdx * (tracklets[iLayer].GetX0() - xref);
e3cf3d02 1567 if (TMath::Abs(tracklets[iLayer].GetZfit(0) - zref) > tracklets[iLayer].GetPadLength() * 0.5 + 1.0)
3b57a3f7 1568 accept = kFALSE;
1569 }
1570 if (!accept) {
41702fec 1571 zfitter.Eval();
3b57a3f7 1572 Double_t dzmf = zfitter.GetFunctionParameter(1);
1573 Double_t zmf = zfitter.GetFunctionValue(&xref);
1574 fitter->FixParameter(3, zmf);
1575 fitter->FixParameter(4, dzmf);
e17f4785 1576 fitter->Eval();
3b57a3f7 1577 fitter->ReleaseParameter(3);
1578 fitter->ReleaseParameter(4);
1579 z0 = fitter->GetParameter(3); // = zmf ?
1580 dzdx = fitter->GetParameter(4); // = dzmf ?
1581 }
1582
1583 // Calculate Curvature
1584 Double_t a = fitter->GetParameter(0);
1585 Double_t b = fitter->GetParameter(1);
1586 Double_t c = fitter->GetParameter(2);
1587 Double_t y0 = 1. / a;
1588 Double_t x0 = -b * y0;
a015e406 1589 Double_t tmp = y0*y0 + x0*x0 - c*y0;
1590 if(tmp<=0.) return 1.E10;
4d6aee34 1591 Double_t radius = TMath::Sqrt(tmp);
1592 Double_t curvature = 1.0 + b*b - c*a;
1593 if (curvature > 0.0) curvature = a / TMath::Sqrt(curvature);
3b57a3f7 1594
1595 // Calculate chi2 of the fit
1596 Double_t chi2 = fitter->GetChisquare()/Double_t(nPoints);
352cef8f 1597 AliDebugGeneral("AliTRDtrackerV1::FitRiemanTilt()", 4,
1598 Form("x0[%6.2f] y0[%6.2f] R[%6.2f] chi2[%f]\n", x0, y0, radius, chi2));
3b57a3f7 1599
1600 // Update the tracklets
1601 if(!track){
1602 for(Int_t ip = 0; ip < kNPlanes; ip++) {
1603 x = tracklets[ip].GetX0();
4d6aee34 1604 tmp = radius*radius-(x-x0)*(x-x0);
a015e406 1605 if(tmp <= 0.) continue;
1606 tmp = TMath::Sqrt(tmp);
3b57a3f7 1607
1608 // y: R^2 = (x - x0)^2 + (y - y0)^2
1609 // => y = y0 +/- Sqrt(R^2 - (x - x0)^2)
1610 tracklets[ip].SetYref(0, y0 - (y0>0.?1.:-1)*tmp);
1611 // => dy/dx = (x - x0)/Sqrt(R^2 - (x - x0)^2)
1612 tracklets[ip].SetYref(1, (x - x0) / tmp);
1613 tracklets[ip].SetZref(0, z0 + dzdx * (x - xref));
1614 tracklets[ip].SetZref(1, dzdx);
4d6aee34 1615 tracklets[ip].SetC(curvature);
3b57a3f7 1616 tracklets[ip].SetChi2(chi2);
1617 }
1618 }
3b57a3f7 1619 //update track points array
1620 if(np && points){
1621 Float_t xyz[3];
1622 for(int ip=0; ip<np; ip++){
1623 points[ip].GetXYZ(xyz);
4d6aee34 1624 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 1625 xyz[2] = z0 + dzdx * (xyz[0] - xref);
1626 points[ip].SetXYZ(xyz);
1627 }
1628 }
1629
3b57a3f7 1630 return chi2;
1631}
1632
1633
1bf51039 1634//____________________________________________________________________
e17f4785 1635Double_t AliTRDtrackerV1::FitKalman(AliTRDtrackV1 *track, AliTRDseedV1 * const tracklets, Bool_t up, Int_t np, AliTrackPoint *points)
1bf51039 1636{
1637// Kalman filter implementation for the TRD.
1638// It returns the positions of the fit in the array "points"
1639//
1640// Author : A.Bercuci@gsi.de
1641
3cfaffa4 1642 // printf("Start track @ x[%f]\n", track->GetX());
1bf51039 1643
1644 //prepare marker points along the track
1645 Int_t ip = np ? 0 : 1;
1646 while(ip<np){
1647 if((up?-1:1) * (track->GetX() - points[ip].GetX()) > 0.) break;
1648 //printf("AliTRDtrackerV1::FitKalman() : Skip track marker x[%d] = %7.3f. Before track start ( %7.3f ).\n", ip, points[ip].GetX(), track->GetX());
1649 ip++;
1650 }
1651 //if(points) printf("First marker point @ x[%d] = %f\n", ip, points[ip].GetX());
1652
1653
4d6aee34 1654 AliTRDseedV1 tracklet, *ptrTracklet = NULL;
1bf51039 1655
1656 //Loop through the TRD planes
1657 for (Int_t jplane = 0; jplane < kNPlanes; jplane++) {
1658 // GET TRACKLET OR BUILT IT
1659 Int_t iplane = up ? jplane : kNPlanes - 1 - jplane;
1660 if(tracklets){
e17f4785 1661 if(!(ptrTracklet = &tracklets[iplane])) continue;
1bf51039 1662 }else{
1663 if(!(ptrTracklet = track->GetTracklet(iplane))){
4d6aee34 1664 /*AliTRDtrackerV1 *tracker = NULL;
a2fbb6ec 1665 if(!(tracker = dynamic_cast<AliTRDtrackerV1*>( AliTRDrecoParam:Tracker()))) continue;
1bf51039 1666 ptrTracklet = new(&tracklet) AliTRDseedV1(iplane);
1667 if(!tracker->MakeTracklet(ptrTracklet, track)) */
1668 continue;
1669 }
1670 }
1671 if(!ptrTracklet->IsOK()) continue;
1672
1673 Double_t x = ptrTracklet->GetX0();
1674
1675 while(ip < np){
1676 //don't do anything if next marker is after next update point.
1677 if((up?-1:1) * (points[ip].GetX() - x) - fgkMaxStep < 0) break;
1bf51039 1678 if(((up?-1:1) * (points[ip].GetX() - track->GetX()) < 0) && !PropagateToX(*track, points[ip].GetX(), fgkMaxStep)) return -1.;
1679
1680 Double_t xyz[3]; // should also get the covariance
3cfaffa4 1681 track->GetXYZ(xyz);
1682 track->Global2LocalPosition(xyz, track->GetAlpha());
1683 points[ip].SetXYZ(xyz[0], xyz[1], xyz[2]);
1bf51039 1684 ip++;
1685 }
3cfaffa4 1686 // printf("plane[%d] tracklet[%p] x[%f]\n", iplane, ptrTracklet, x);
1bf51039 1687
3cfaffa4 1688 // Propagate closer to the next update point
1bf51039 1689 if(((up?-1:1) * (x - track->GetX()) + fgkMaxStep < 0) && !PropagateToX(*track, x + (up?-1:1)*fgkMaxStep, fgkMaxStep)) return -1.;
1690
1691 if(!AdjustSector(track)) return -1;
1692 if(TMath::Abs(track->GetSnp()) > fgkMaxSnp) return -1;
1693
1694 //load tracklet to the tracker and the track
1695/* Int_t index;
1696 if((index = FindTracklet(ptrTracklet)) < 0){
1697 ptrTracklet = SetTracklet(&tracklet);
1698 index = fTracklets->GetEntriesFast()-1;
1699 }
1700 track->SetTracklet(ptrTracklet, index);*/
1701
1702
1703 // register tracklet to track with tracklet creation !!
1704 // PropagateBack : loaded tracklet to the tracker and update index
1705 // RefitInward : update index
1706 // MakeTrack : loaded tracklet to the tracker and update index
1707 if(!tracklets) track->SetTracklet(ptrTracklet, -1);
1708
1709
1710 //Calculate the mean material budget along the path inside the chamber
1711 Double_t xyz0[3]; track->GetXYZ(xyz0);
1712 Double_t alpha = track->GetAlpha();
1713 Double_t xyz1[3], y, z;
1714 if(!track->GetProlongation(x, y, z)) return -1;
1715 xyz1[0] = x * TMath::Cos(alpha) - y * TMath::Sin(alpha);
1716 xyz1[1] = +x * TMath::Sin(alpha) + y * TMath::Cos(alpha);
1717 xyz1[2] = z;
fbe11be7 1718 if(TMath::Abs(xyz0[0] - xyz1[0]) < 1e-3 && TMath::Abs(xyz0[1] - xyz1[1]) < 1e-3) continue; // check wheter we are at the same global x position
1bf51039 1719 Double_t param[7];
3cfaffa4 1720 if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param) <=0.) break;
1bf51039 1721 Double_t xrho = param[0]*param[4]; // density*length
1722 Double_t xx0 = param[1]; // radiation length
1723
1724 //Propagate the track
1725 track->PropagateTo(x, xx0, xrho);
1726 if (!AdjustSector(track)) break;
1727
1728 //Update track
b72f4eaf 1729 Double_t cov[3]; ptrTracklet->GetCovAt(x, cov);
1730 Double_t p[2] = { ptrTracklet->GetY(), ptrTracklet->GetZ()};
1731 Double_t chi2 = ((AliExternalTrackParam*)track)->GetPredictedChi2(p, cov);
1732 if(chi2<1e+10) track->Update(p, cov, chi2);
1bf51039 1733 if(!up) continue;
1734
1735 //Reset material budget if 2 consecutive gold
1736 if(iplane>0 && track->GetTracklet(iplane-1) && ptrTracklet->GetN() + track->GetTracklet(iplane-1)->GetN() > 20) track->SetBudget(2, 0.);
1737 } // end planes loop
1738
1739 // extrapolation
1740 while(ip < np){
1741 if(((up?-1:1) * (points[ip].GetX() - track->GetX()) < 0) && !PropagateToX(*track, points[ip].GetX(), fgkMaxStep)) return -1.;
1742
1743 Double_t xyz[3]; // should also get the covariance
3cfaffa4 1744 track->GetXYZ(xyz);
1745 track->Global2LocalPosition(xyz, track->GetAlpha());
1746 points[ip].SetXYZ(xyz[0], xyz[1], xyz[2]);
1bf51039 1747 ip++;
1748 }
1749
1750 return track->GetChi2();
1751}
3b57a3f7 1752
eb38ed55 1753//_________________________________________________________________________
bb56afff 1754Float_t AliTRDtrackerV1::CalculateChi2Z(AliTRDseedV1 *tracklets, Double_t offset, Double_t slope, Double_t xref)
eb38ed55 1755{
41702fec 1756 //
1757 // Calculates the chi2-value of the track in z-Direction including tilting pad correction.
1758 // A linear dependence on the x-value serves as a model.
1759 // The parameters are related to the tilted Riemann fit.
1760 // Parameters: - Array of tracklets (AliTRDseedV1) related to the track candidate
1761 // - the offset for the reference x
1762 // - the slope
1763 // - the reference x position
1764 // Output: - The Chi2 value of the track in z-Direction
1765 //
1766 Float_t chi2Z = 0, nLayers = 0;
053767a4 1767 for (Int_t iLayer = 0; iLayer < AliTRDgeometry::kNlayer; iLayer++) {
41702fec 1768 if(!tracklets[iLayer].IsOK()) continue;
1769 Double_t z = offset + slope * (tracklets[iLayer].GetX0() - xref);
e3cf3d02 1770 chi2Z += TMath::Abs(tracklets[iLayer].GetZfit(0) - z);
41702fec 1771 nLayers++;
1772 }
1773 chi2Z /= TMath::Max((nLayers - 3.0),1.0);
1774 return chi2Z;
eb38ed55 1775}
1776
bccda319 1777//_____________________________________________________________________________
1778Int_t AliTRDtrackerV1::PropagateToX(AliTRDtrackV1 &t, Double_t xToGo, Double_t maxStep)
1779{
41702fec 1780 //
1781 // Starting from current X-position of track <t> this function
1782 // extrapolates the track up to radial position <xToGo>.
1783 // Returns 1 if track reaches the plane, and 0 otherwise
1784 //
bccda319 1785
41702fec 1786 const Double_t kEpsilon = 0.00001;
bccda319 1787
41702fec 1788 // Current track X-position
1789 Double_t xpos = t.GetX();
bccda319 1790
41702fec 1791 // Direction: inward or outward
1792 Double_t dir = (xpos < xToGo) ? 1.0 : -1.0;
bccda319 1793
41702fec 1794 while (((xToGo - xpos) * dir) > kEpsilon) {
bccda319 1795
41702fec 1796 Double_t xyz0[3];
1797 Double_t xyz1[3];
1798 Double_t param[7];
1799 Double_t x;
1800 Double_t y;
1801 Double_t z;
bccda319 1802
41702fec 1803 // The next step size
1804 Double_t step = dir * TMath::Min(TMath::Abs(xToGo-xpos),maxStep);
bccda319 1805
41702fec 1806 // Get the global position of the starting point
1807 t.GetXYZ(xyz0);
bccda319 1808
41702fec 1809 // X-position after next step
1810 x = xpos + step;
bccda319 1811
41702fec 1812 // Get local Y and Z at the X-position of the next step
3352b455 1813 if(t.GetProlongation(x,y,z)<0) return 0; // No prolongation possible
bccda319 1814
41702fec 1815 // The global position of the end point of this prolongation step
1816 xyz1[0] = x * TMath::Cos(t.GetAlpha()) - y * TMath::Sin(t.GetAlpha());
1817 xyz1[1] = +x * TMath::Sin(t.GetAlpha()) + y * TMath::Cos(t.GetAlpha());
1818 xyz1[2] = z;
bccda319 1819
41702fec 1820 // Calculate the mean material budget between start and
1821 // end point of this prolongation step
83dea92e 1822 if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param)<=0.) return 0;
bccda319 1823
41702fec 1824 // Propagate the track to the X-position after the next step
9c87a076 1825 if (!t.PropagateTo(x, param[1], param[0]*param[4])) return 0;
bccda319 1826
41702fec 1827 // Rotate the track if necessary
1828 AdjustSector(&t);
bccda319 1829
41702fec 1830 // New track X-position
1831 xpos = t.GetX();
bccda319 1832
41702fec 1833 }
bccda319 1834
41702fec 1835 return 1;
bccda319 1836
1837}
1838
eb38ed55 1839
1840//_____________________________________________________________________________
1841Int_t AliTRDtrackerV1::ReadClusters(TClonesArray* &array, TTree *clusterTree) const
1842{
41702fec 1843 //
1844 // Reads AliTRDclusters from the file.
1845 // The names of the cluster tree and branches
1846 // should match the ones used in AliTRDclusterizer::WriteClusters()
1847 //
1848
1849 Int_t nsize = Int_t(clusterTree->GetTotBytes() / (sizeof(AliTRDcluster)));
1850 TObjArray *clusterArray = new TObjArray(nsize+1000);
1851
1852 TBranch *branch = clusterTree->GetBranch("TRDcluster");
1853 if (!branch) {
1854 AliError("Can't get the branch !");
1855 return 1;
1856 }
1857 branch->SetAddress(&clusterArray);
1858
1859 if(!fClusters){
4d6aee34 1860 Float_t nclusters = fkReconstructor->GetRecoParam()->GetNClusters();
1861 if(fkReconstructor->IsHLT()) nclusters /= AliTRDgeometry::kNsector;
8ae98148 1862 array = new TClonesArray("AliTRDcluster", Int_t(nclusters));
41702fec 1863 array->SetOwner(kTRUE);
1864 }
1865
1866 // Loop through all entries in the tree
1867 Int_t nEntries = (Int_t) clusterTree->GetEntries();
1868 Int_t nbytes = 0;
1869 Int_t ncl = 0;
4d6aee34 1870 AliTRDcluster *c = NULL;
41702fec 1871 for (Int_t iEntry = 0; iEntry < nEntries; iEntry++) {
1872 // Import the tree
1873 nbytes += clusterTree->GetEvent(iEntry);
1874
1875 // Get the number of points in the detector
1876 Int_t nCluster = clusterArray->GetEntriesFast();
1877 for (Int_t iCluster = 0; iCluster < nCluster; iCluster++) {
1878 if(!(c = (AliTRDcluster *) clusterArray->UncheckedAt(iCluster))) continue;
41702fec 1879 new((*fClusters)[ncl++]) AliTRDcluster(*c);
1880 delete (clusterArray->RemoveAt(iCluster));
1881 }
1882
1883 }
1884 delete clusterArray;
1885
1886 return 0;
eb38ed55 1887}
1888
1889//_____________________________________________________________________________
1890Int_t AliTRDtrackerV1::LoadClusters(TTree *cTree)
1891{
41702fec 1892 //
66f6bfd9 1893 // Fills clusters into TRD tracking sectors
41702fec 1894 //
41702fec 1895
4d6aee34 1896 if(!fkReconstructor->IsWritingClusters()){
48f8adf3 1897 fClusters = AliTRDReconstructor::GetClusters();
1898 } else {
66f6bfd9 1899 if (ReadClusters(fClusters, cTree)) {
1900 AliError("Problem with reading the clusters !");
1901 return 1;
1902 }
1903 }
1904 SetClustersOwner();
1905
48f8adf3 1906 if(!fClusters || !fClusters->GetEntriesFast()){
66f6bfd9 1907 AliInfo("No TRD clusters");
41702fec 1908 return 1;
1909 }
66f6bfd9 1910
1911 //Int_t nin =
1912 BuildTrackingContainers();
1913
1914 //Int_t ncl = fClusters->GetEntriesFast();
1915 //AliInfo(Form("Clusters %d [%6.2f %% in the active volume]", ncl, 100.*float(nin)/ncl));
1916
1917 return 0;
1918}
1919
1920//_____________________________________________________________________________
4d6aee34 1921Int_t AliTRDtrackerV1::LoadClusters(TClonesArray * const clusters)
66f6bfd9 1922{
1923 //
1924 // Fills clusters into TRD tracking sectors
1925 // Function for use in the HLT
1926
1927 if(!clusters || !clusters->GetEntriesFast()){
1928 AliInfo("No TRD clusters");
41702fec 1929 return 1;
1930 }
1931
66f6bfd9 1932 fClusters = clusters;
1933 SetClustersOwner();
1934
1935 //Int_t nin =
1936 BuildTrackingContainers();
1937
1938 //Int_t ncl = fClusters->GetEntriesFast();
1939 //AliInfo(Form("Clusters %d [%6.2f %% in the active volume]", ncl, 100.*float(nin)/ncl));
1940
1941 return 0;
1942}
1943
1944
1945//____________________________________________________________________
1946Int_t AliTRDtrackerV1::BuildTrackingContainers()
1947{
1948// Building tracking containers for clusters
1949
1950 Int_t nin =0, icl = fClusters->GetEntriesFast();
41702fec 1951 while (icl--) {
1952 AliTRDcluster *c = (AliTRDcluster *) fClusters->UncheckedAt(icl);
1953 if(c->IsInChamber()) nin++;
4226b195 1954 if(fkReconstructor->IsHLT()) c->SetRPhiMethod(AliTRDcluster::kCOG);
41702fec 1955 Int_t detector = c->GetDetector();
1956 Int_t sector = fGeom->GetSector(detector);
053767a4 1957 Int_t stack = fGeom->GetStack(detector);
1958 Int_t layer = fGeom->GetLayer(detector);
41702fec 1959
053767a4 1960 fTrSec[sector].GetChamber(stack, layer, kTRUE)->InsertCluster(c, icl);
41702fec 1961 }
b0a48c4d 1962
1963 const AliTRDCalDet *cal = AliTRDcalibDB::Instance()->GetT0Det();
053767a4 1964 for(int isector =0; isector<AliTRDgeometry::kNsector; isector++){
41702fec 1965 if(!fTrSec[isector].GetNChambers()) continue;
4d6aee34 1966 fTrSec[isector].Init(fkReconstructor, cal);
41702fec 1967 }
66f6bfd9 1968
1969 return nin;
eb38ed55 1970}
1971
1972
66f6bfd9 1973
0906e73e 1974//____________________________________________________________________
172b6f82 1975void AliTRDtrackerV1::UnloadClusters()
0906e73e 1976{
d4cf71ca 1977//
1978// Clears the arrays of clusters and tracks. Resets sectors and timebins
1979// If option "force" is also set the containers are also deleted. This is useful
1980// in case of HLT
1981
1982 if(fTracks){
1983 fTracks->Delete();
4d6aee34 1984 if(HasRemoveContainers()){delete fTracks; fTracks = NULL;}
d4cf71ca 1985 }
1986 if(fTracklets){
1987 fTracklets->Delete();
4d6aee34 1988 if(HasRemoveContainers()){delete fTracklets; fTracklets = NULL;}
d4cf71ca 1989 }
48f8adf3 1990 if(fClusters){
1991 if(IsClustersOwner()) fClusters->Delete();
1992
1993 // save clusters array in the reconstructor for further use.
4d6aee34 1994 if(!fkReconstructor->IsWritingClusters()){
48f8adf3 1995 AliTRDReconstructor::SetClusters(fClusters);
1996 SetClustersOwner(kFALSE);
4d6aee34 1997 } else AliTRDReconstructor::SetClusters(NULL);
48f8adf3 1998 }
0906e73e 1999
053767a4 2000 for (int i = 0; i < AliTRDgeometry::kNsector; i++) fTrSec[i].Clear();
0906e73e 2001
41702fec 2002 // Increment the Event Number
2003 AliTRDtrackerDebug::SetEventNumber(AliTRDtrackerDebug::GetEventNumber() + 1);
eb38ed55 2004}
0906e73e 2005
fac58f00 2006// //____________________________________________________________________
2007// void AliTRDtrackerV1::UseClusters(const AliKalmanTrack *t, Int_t) const
2008// {
2009// const AliTRDtrackV1 *track = dynamic_cast<const AliTRDtrackV1*>(t);
2010// if(!track) return;
2011//
4d6aee34 2012// AliTRDseedV1 *tracklet = NULL;
fac58f00 2013// for(Int_t ily=AliTRDgeometry::kNlayer; ily--;){
2014// if(!(tracklet = track->GetTracklet(ily))) continue;
4d6aee34 2015// AliTRDcluster *c = NULL;
8d2bec9e 2016// for(Int_t ic=AliTRDseed::kNclusters; ic--;){
fac58f00 2017// if(!(c=tracklet->GetClusters(ic))) continue;
2018// c->Use();
2019// }
2020// }
2021// }
2022//
b1957d3c 2023
eb38ed55 2024//_____________________________________________________________________________
4d6aee34 2025Bool_t AliTRDtrackerV1::AdjustSector(AliTRDtrackV1 *const track)
eb38ed55 2026{
41702fec 2027 //
2028 // Rotates the track when necessary
2029 //
2030
2031 Double_t alpha = AliTRDgeometry::GetAlpha();
2032 Double_t y = track->GetY();
2033 Double_t ymax = track->GetX()*TMath::Tan(0.5*alpha);
3cfaffa4 2034
41702fec 2035 if (y > ymax) {
2036 if (!track->Rotate( alpha)) {
2037 return kFALSE;
2038 }
2039 }
2040 else if (y < -ymax) {
2041 if (!track->Rotate(-alpha)) {
2042 return kFALSE;
2043 }
2044 }
2045
2046 return kTRUE;
0906e73e 2047
2048}
2049
eb38ed55 2050
0906e73e 2051//____________________________________________________________________
4d6aee34 2052AliTRDseedV1* AliTRDtrackerV1::GetTracklet(AliTRDtrackV1 *const track, Int_t p, Int_t &idx)
0906e73e 2053{
41702fec 2054 // Find tracklet for TRD track <track>
2055 // Parameters
2056 // - track
2057 // - sector
2058 // - plane
2059 // - index
2060 // Output
2061 // tracklet
2062 // index
2063 // Detailed description
2064 //
2065 idx = track->GetTrackletIndex(p);
17896e82 2066 AliTRDseedV1 *tracklet = (idx<0) ? NULL : (AliTRDseedV1*)fTracklets->UncheckedAt(idx);
41702fec 2067
2068 return tracklet;
0906e73e 2069}
2070
2071//____________________________________________________________________
4d6aee34 2072AliTRDseedV1* AliTRDtrackerV1::SetTracklet(const AliTRDseedV1 * const tracklet)
0906e73e 2073{
41702fec 2074 // Add this tracklet to the list of tracklets stored in the tracker
2075 //
2076 // Parameters
2077 // - tracklet : pointer to the tracklet to be added to the list
2078 //
2079 // Output
2080 // - the index of the new tracklet in the tracker tracklets list
2081 //
2082 // Detailed description
2083 // Build the tracklets list if it is not yet created (late initialization)
2084 // and adds the new tracklet to the list.
2085 //
2086 if(!fTracklets){
053767a4 2087 fTracklets = new TClonesArray("AliTRDseedV1", AliTRDgeometry::Nsector()*kMaxTracksStack);
41702fec 2088 fTracklets->SetOwner(kTRUE);
2089 }
2090 Int_t nentries = fTracklets->GetEntriesFast();
2091 return new ((*fTracklets)[nentries]) AliTRDseedV1(*tracklet);
972ef65e 2092}
2093
d20df6fc 2094//____________________________________________________________________
4d6aee34 2095AliTRDtrackV1* AliTRDtrackerV1::SetTrack(const AliTRDtrackV1 * const track)
d20df6fc 2096{
2097 // Add this track to the list of tracks stored in the tracker
2098 //
2099 // Parameters
2100 // - track : pointer to the track to be added to the list
2101 //
2102 // Output
2103 // - the pointer added
2104 //
2105 // Detailed description
2106 // Build the tracks list if it is not yet created (late initialization)
2107 // and adds the new track to the list.
2108 //
2109 if(!fTracks){
053767a4 2110 fTracks = new TClonesArray("AliTRDtrackV1", AliTRDgeometry::Nsector()*kMaxTracksStack);
d20df6fc 2111 fTracks->SetOwner(kTRUE);
2112 }
2113 Int_t nentries = fTracks->GetEntriesFast();
2114 return new ((*fTracks)[nentries]) AliTRDtrackV1(*track);
2115}
2116
2117
0906e73e 2118
e4f2f73d 2119//____________________________________________________________________
eb38ed55 2120Int_t AliTRDtrackerV1::Clusters2TracksSM(Int_t sector, AliESDEvent *esd)
e4f2f73d 2121{
41702fec 2122 //
2123 // Steer tracking for one SM.
2124 //
2125 // Parameters :
2126 // sector : Array of (SM) propagation layers containing clusters
2127 // esd : The current ESD event. On output it contains the also
2128 // the ESD (TRD) tracks found in this SM.
2129 //
2130 // Output :
2131 // Number of tracks found in this TRD supermodule.
2132 //
2133 // Detailed description
2134 //
2135 // 1. Unpack AliTRDpropagationLayers objects for each stack.
2136 // 2. Launch stack tracking.
2137 // See AliTRDtrackerV1::Clusters2TracksStack() for details.
2138 // 3. Pack results in the ESD event.
2139 //
2140
41702fec 2141 Int_t nTracks = 0;
2142 Int_t nChambers = 0;
4d6aee34 2143 AliTRDtrackingChamber **stack = NULL, *chamber = NULL;
053767a4 2144 for(int istack = 0; istack<AliTRDgeometry::kNstack; istack++){
41702fec 2145 if(!(stack = fTrSec[sector].GetStack(istack))) continue;
2146 nChambers = 0;
053767a4 2147 for(int ilayer=0; ilayer<AliTRDgeometry::kNlayer; ilayer++){
2148 if(!(chamber = stack[ilayer])) continue;
4d6aee34 2149 if(chamber->GetNClusters() < fgNTimeBins * fkReconstructor->GetRecoParam() ->GetFindableClusters()) continue;
41702fec 2150 nChambers++;
053767a4 2151 //AliInfo(Form("sector %d stack %d layer %d clusters %d", sector, istack, ilayer, chamber->GetNClusters()));
41702fec 2152 }
2153 if(nChambers < 4) continue;
2154 //AliInfo(Form("Doing stack %d", istack));
b1135f96 2155 nTracks += Clusters2TracksStack(stack, fTracksESD);
41702fec 2156 }
050875b0 2157 if(nTracks) AliDebug(2, Form("Number of tracks: SM_%02d[%d]", sector, nTracks));
2158
352cef8f 2159 for(int itrack=0; itrack<nTracks; itrack++){
2160 AliESDtrack *esdTrack((AliESDtrack*)(fTracksESD->operator[](itrack)));
2161 Int_t id = esd->AddTrack(esdTrack);
2162
2163 // set ESD id to stand alone TRD tracks
2164 if (fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) > 0){
2165 esdTrack=esd->GetTrack(id);
2166 TObject *o(NULL); Int_t ic(0);
2167 AliTRDtrackV1 *calibTrack(NULL);
2168 while((o = esdTrack->GetCalibObject(ic++))){
2169 if(!(calibTrack = dynamic_cast<AliTRDtrackV1*>(o))) continue;
2170 calibTrack->SetESDid(esdTrack->GetID());
2171 break;
2172 }
2173 }
2174 }
41702fec 2175
2176 // Reset Track and Candidate Number
2177 AliTRDtrackerDebug::SetCandidateNumber(0);
2178 AliTRDtrackerDebug::SetTrackNumber(0);
b1135f96 2179
2180 // delete ESD tracks in the array
2181 fTracksESD->Delete();
41702fec 2182 return nTracks;
e4f2f73d 2183}
2184
2185//____________________________________________________________________
4d6aee34 2186Int_t AliTRDtrackerV1::Clusters2TracksStack(AliTRDtrackingChamber **stack, TClonesArray * const esdTrackList)
e4f2f73d 2187{
41702fec 2188 //
2189 // Make tracks in one TRD stack.
2190 //
2191 // Parameters :
2192 // layer : Array of stack propagation layers containing clusters
2193 // esdTrackList : Array of ESD tracks found by the stand alone tracker.
2194 // On exit the tracks found in this stack are appended.
2195 //
2196 // Output :
2197 // Number of tracks found in this stack.
2198 //
2199 // Detailed description
2200 //
2201 // 1. Find the 3 most useful seeding chambers. See BuildSeedingConfigs() for details.
2202 // 2. Steer AliTRDtrackerV1::MakeSeeds() for 3 seeding layer configurations.
2203 // See AliTRDtrackerV1::MakeSeeds() for more details.
2204 // 3. Arrange track candidates in decreasing order of their quality
2205 // 4. Classify tracks in 5 categories according to:
2206 // a) number of layers crossed
2207 // b) track quality
2208 // 5. Sign clusters by tracks in decreasing order of track quality
2209 // 6. Build AliTRDtrack out of seeding tracklets
2210 // 7. Cook MC label
2211 // 8. Build ESD track and register it to the output list
2212 //
2213
b0a48c4d 2214 const AliTRDCalDet *cal = AliTRDcalibDB::Instance()->GetT0Det();
4d6aee34 2215 AliTRDtrackingChamber *chamber = NULL;
2216 AliTRDtrackingChamber **ci = NULL;
41702fec 2217 AliTRDseedV1 sseed[kMaxTracksStack*6]; // to be initialized
2218 Int_t pars[4]; // MakeSeeds parameters
2219
2220 //Double_t alpha = AliTRDgeometry::GetAlpha();
2221 //Double_t shift = .5 * alpha;
2222 Int_t configs[kNConfigs];
2223
fac58f00 2224 // Purge used clusters from the containers
2225 ci = &stack[0];
2226 for(Int_t ic = kNPlanes; ic--; ci++){
2227 if(!(*ci)) continue;
2228 (*ci)->Update();
2229 }
2230
41702fec 2231 // Build initial seeding configurations
2232 Double_t quality = BuildSeedingConfigs(stack, configs);
a2fbb6ec 2233 if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) > 10){
41702fec 2234 AliInfo(Form("Plane config %d %d %d Quality %f"
2235 , configs[0], configs[1], configs[2], quality));
2236 }
d931f2aa 2237
41702fec 2238
2239 // Initialize contors
2240 Int_t ntracks, // number of TRD track candidates
2241 ntracks1, // number of registered TRD tracks/iter
2242 ntracks2 = 0; // number of all registered TRD tracks in stack
2243 fSieveSeeding = 0;
d931f2aa 2244
2245 // Get stack index
fac58f00 2246 Int_t ic = 0; ci = &stack[0];
2247 while(ic<kNPlanes && !(*ci)){ic++; ci++;}
2248 if(!(*ci)) return ntracks2;
2249 Int_t istack = fGeom->GetStack((*ci)->GetDetector());
d931f2aa 2250
41702fec 2251 do{
2252 // Loop over seeding configurations
2253 ntracks = 0; ntracks1 = 0;
2254 for (Int_t iconf = 0; iconf<3; iconf++) {
2255 pars[0] = configs[iconf];
2256 pars[1] = ntracks;
d931f2aa 2257 pars[2] = istack;
41702fec 2258 ntracks = MakeSeeds(stack, &sseed[6*ntracks], pars);
6e39bde4 2259 //AliInfo(Form("Number of Tracks after iteration step %d: %d\n", iconf, ntracks));
41702fec 2260 if(ntracks == kMaxTracksStack) break;
2261 }
980d5a2a 2262 AliDebug(2, Form("Candidate TRD tracks %d in iteration %d.", ntracks, fSieveSeeding));
41702fec 2263
2264 if(!ntracks) break;
2265
2266 // Sort the seeds according to their quality
2267 Int_t sort[kMaxTracksStack];
2268 TMath::Sort(ntracks, fTrackQuality, sort, kTRUE);
2269
2270 // Initialize number of tracks so far and logic switches
2271 Int_t ntracks0 = esdTrackList->GetEntriesFast();
2272 Bool_t signedTrack[kMaxTracksStack];
2273 Bool_t fakeTrack[kMaxTracksStack];
2274 for (Int_t i=0; i<ntracks; i++){
2275 signedTrack[i] = kFALSE;
2276 fakeTrack[i] = kFALSE;
2277 }
2278 //AliInfo("Selecting track candidates ...");
2279
2280 // Sieve clusters in decreasing order of track quality
2281 Double_t trackParams[7];
4d6aee34 2282 // AliTRDseedV1 *lseed = NULL;
41702fec 2283 Int_t jSieve = 0, candidates;
2284 do{
2285 //AliInfo(Form("\t\tITER = %i ", jSieve));
2286
2287 // Check track candidates
2288 candidates = 0;
2289 for (Int_t itrack = 0; itrack < ntracks; itrack++) {
804bb02e 2290 Int_t trackIndex = sort[itrack];
2291 if (signedTrack[trackIndex] || fakeTrack[trackIndex]) continue;
41702fec 2292
2293
804bb02e 2294 // Calculate track parameters from tracklets seeds
804bb02e 2295 Int_t ncl = 0;
2296 Int_t nused = 0;
2297 Int_t nlayers = 0;
2298 Int_t findable = 0;
2299 for (Int_t jLayer = 0; jLayer < kNPlanes; jLayer++) {
2300 Int_t jseed = kNPlanes*trackIndex+jLayer;
2301 if(!sseed[jseed].IsOK()) continue;
f29f13a6 2302 if (TMath::Abs(sseed[jseed].GetYref(0) / sseed[jseed].GetX0()) < 0.158) findable++;
eede7907 2303 // TODO here we get a sig fault which should never happen !
804bb02e 2304 sseed[jseed].UpdateUsed();
2305 ncl += sseed[jseed].GetN2();
2306 nused += sseed[jseed].GetNUsed();
2307 nlayers++;
804bb02e 2308 }
2309
f29f13a6 2310 // Filter duplicated tracks
2311 if (nused > 30){
2312 //printf("Skip %d nused %d\n", trackIndex, nused);
2313 fakeTrack[trackIndex] = kTRUE;
2314 continue;
2315 }
5ef88e00 2316 if (ncl>0 && Float_t(nused)/ncl >= .25){
f29f13a6 2317 //printf("Skip %d nused/ncl >= .25\n", trackIndex);
2318 fakeTrack[trackIndex] = kTRUE;
2319 continue;
2320 }
41702fec 2321
f29f13a6 2322 // Classify tracks
2323 Bool_t skip = kFALSE;
2324 switch(jSieve){
2325 case 0:
2326 if(nlayers < 6) {skip = kTRUE; break;}
2327 if(TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -5.){skip = kTRUE; break;}
2328 break;
2329
2330 case 1:
2331 if(nlayers < findable){skip = kTRUE; break;}
2332 if(TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -4.){skip = kTRUE; break;}
2333 break;
2334
2335 case 2:
2336 if ((nlayers == findable) || (nlayers == 6)) { skip = kTRUE; break;}
2337 if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -6.0){skip = kTRUE; break;}
2338 break;
2339
2340 case 3:
2341 if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -5.){skip = kTRUE; break;}
2342 break;
2343
2344 case 4:
2345 if (nlayers == 3){skip = kTRUE; break;}
2346 //if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) - nused/(nlayers-3.0) < -15.0){skip = kTRUE; break;}
2347 break;
2348 }
2349 if(skip){
2350 candidates++;
5ef88e00 2351 AliDebug(4, Form("REJECTED : %d idx[%d] quality[%e] tracklets[%d] usedClusters[%d]", itrack, trackIndex, fTrackQuality[trackIndex], nlayers, nused));
f29f13a6 2352 continue;
5ef88e00 2353 } else AliDebug(4, Form("ACCEPTED : %d idx[%d] quality[%e] tracklets[%d] usedClusters[%d]", itrack, trackIndex, fTrackQuality[trackIndex], nlayers, nused));
2354
f29f13a6 2355 signedTrack[trackIndex] = kTRUE;
2356
2357 // Build track parameters
2358 AliTRDseedV1 *lseed =&sseed[trackIndex*6];
2359 /* Int_t idx = 0;
2360 while(idx<3 && !lseed->IsOK()) {
2361 idx++;
2362 lseed++;
2363 }*/
2364 Double_t x = lseed->GetX0();// - 3.5;
2365 trackParams[0] = x; //NEW AB
2366 trackParams[1] = lseed->GetYref(0); // lseed->GetYat(x);
2367 trackParams[2] = lseed->GetZref(0); // lseed->GetZat(x);
2368 trackParams[3] = TMath::Sin(TMath::ATan(lseed->GetYref(1)));
2369 trackParams[4] = lseed->GetZref(1) / TMath::Sqrt(1. + lseed->GetYref(1) * lseed->GetYref(1));
2370 trackParams[5] = lseed->GetC();
2371 Int_t ich = 0; while(!(chamber = stack[ich])) ich++;
2372 trackParams[6] = fGeom->GetSector(chamber->GetDetector());/* *alpha+shift; // Supermodule*/
2373
a2fbb6ec 2374 if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) > 1 && fkReconstructor->IsDebugStreaming()){
eb2b4f91 2375 //AliInfo(Form("Track %d [%d] nlayers %d trackQuality = %e nused %d, yref = %3.3f", itrack, trackIndex, nlayers, fTrackQuality[trackIndex], nused, trackParams[1]));
f29f13a6 2376
f29f13a6 2377 AliTRDseedV1 *dseed[6];
b82b4de1 2378 for(Int_t iseed = AliTRDgeometry::kNlayer; iseed--;) dseed[iseed] = new AliTRDseedV1(lseed[iseed]);
f29f13a6 2379
2380 //Int_t eventNrInFile = esd->GetEventNumberInFile();
f29f13a6 2381 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2382 Int_t trackNumber = AliTRDtrackerDebug::GetTrackNumber();
2383 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
a2fbb6ec 2384 TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
f29f13a6 2385 cstreamer << "Clusters2TracksStack"
2386 << "EventNumber=" << eventNumber
2387 << "TrackNumber=" << trackNumber
2388 << "CandidateNumber=" << candidateNumber
2389 << "Iter=" << fSieveSeeding
2390 << "Like=" << fTrackQuality[trackIndex]
2391 << "S0.=" << dseed[0]
2392 << "S1.=" << dseed[1]
2393 << "S2.=" << dseed[2]
2394 << "S3.=" << dseed[3]
2395 << "S4.=" << dseed[4]
2396 << "S5.=" << dseed[5]
2397 << "p0=" << trackParams[0]
2398 << "p1=" << trackParams[1]
2399 << "p2=" << trackParams[2]
2400 << "p3=" << trackParams[3]
2401 << "p4=" << trackParams[4]
2402 << "p5=" << trackParams[5]
2403 << "p6=" << trackParams[6]
f29f13a6 2404 << "Ncl=" << ncl
2405 << "NLayers=" << nlayers
2406 << "Findable=" << findable
2407 << "NUsed=" << nused
2408 << "\n";
2409 }
d877f55f 2410
f29f13a6 2411 AliTRDtrackV1 *track = MakeTrack(&sseed[trackIndex*kNPlanes], trackParams);
2412 if(!track){
980d5a2a 2413 AliDebug(1, "Track building failed.");
f29f13a6 2414 continue;
d877f55f 2415 }
41702fec 2416
f29f13a6 2417 //AliInfo("End of MakeTrack()");
2418 AliESDtrack *esdTrack = new ((*esdTrackList)[ntracks0++]) AliESDtrack();
2419 esdTrack->UpdateTrackParams(track, AliESDtrack::kTRDout);
2420 esdTrack->SetLabel(track->GetLabel());
2421 track->UpdateESDtrack(esdTrack);
2422 // write ESD-friends if neccessary
a2fbb6ec 2423 if (fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) > 0){
f29f13a6 2424 AliTRDtrackV1 *calibTrack = new AliTRDtrackV1(*track);
2425 calibTrack->SetOwner();
2426 esdTrack->AddCalibObject(calibTrack);
2427 }
2428 ntracks1++;
2429 AliTRDtrackerDebug::SetTrackNumber(AliTRDtrackerDebug::GetTrackNumber() + 1);
41702fec 2430 }
2431
2432 jSieve++;
2433 } while(jSieve<5 && candidates); // end track candidates sieve
2434 if(!ntracks1) break;
2435
2436 // increment counters
2437 ntracks2 += ntracks1;
4302c900 2438
4d6aee34 2439 if(fkReconstructor->IsHLT()) break;
41702fec 2440 fSieveSeeding++;
2441
2442 // Rebuild plane configurations and indices taking only unused clusters into account
2443 quality = BuildSeedingConfigs(stack, configs);
4d6aee34 2444 if(quality < 1.E-7) break; //fkReconstructor->GetRecoParam() ->GetPlaneQualityThreshold()) break;
41702fec 2445
2446 for(Int_t ip = 0; ip < kNPlanes; ip++){
2447 if(!(chamber = stack[ip])) continue;
b0a48c4d 2448 chamber->Build(fGeom, cal);//Indices(fSieveSeeding);
41702fec 2449 }
2450
a2fbb6ec 2451 if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) > 10){
41702fec 2452 AliInfo(Form("Sieve level %d Plane config %d %d %d Quality %f", fSieveSeeding, configs[0], configs[1], configs[2], quality));
2453 }
2454 } while(fSieveSeeding<10); // end stack clusters sieve
2455
2456
2457
2458 //AliInfo(Form("Registered TRD tracks %d in stack %d.", ntracks2, pars[1]));
2459
2460 return ntracks2;
e4f2f73d 2461}
2462
2463//___________________________________________________________________
eb38ed55 2464Double_t AliTRDtrackerV1::BuildSeedingConfigs(AliTRDtrackingChamber **stack, Int_t *configs)
e4f2f73d 2465{
41702fec 2466 //
2467 // Assign probabilities to chambers according to their
2468 // capability of producing seeds.
2469 //
2470 // Parameters :
2471 //
2472 // layers : Array of stack propagation layers for all 6 chambers in one stack
2473 // configs : On exit array of configuration indexes (see GetSeedingConfig()
2474 // for details) in the decreasing order of their seeding probabilities.
2475 //
2476 // Output :
2477 //
2478 // Return top configuration quality
2479 //
2480 // Detailed description:
2481 //
2482 // To each chamber seeding configuration (see GetSeedingConfig() for
2483 // the list of all configurations) one defines 2 quality factors:
2484 // - an apriori topological quality (see GetSeedingConfig() for details) and
2485 // - a data quality based on the uniformity of the distribution of
2486 // clusters over the x range (time bins population). See CookChamberQA() for details.
2487 // The overall chamber quality is given by the product of this 2 contributions.
2488 //
2489
eb2b4f91 2490 Double_t chamberQ[kNPlanes];memset(chamberQ, 0, kNPlanes*sizeof(Double_t));
4d6aee34 2491 AliTRDtrackingChamber *chamber = NULL;
41702fec 2492 for(int iplane=0; iplane<kNPlanes; iplane++){
2493 if(!(chamber = stack[iplane])) continue;
2494 chamberQ[iplane] = (chamber = stack[iplane]) ? chamber->GetQuality() : 0.;
2495 }
2496
eb2b4f91 2497 Double_t tconfig[kNConfigs];memset(tconfig, 0, kNConfigs*sizeof(Double_t));
2498 Int_t planes[] = {0, 0, 0, 0};
41702fec 2499 for(int iconf=0; iconf<kNConfigs; iconf++){
2500 GetSeedingConfig(iconf, planes);
2501 tconfig[iconf] = fgTopologicQA[iconf];
2502 for(int iplane=0; iplane<4; iplane++) tconfig[iconf] *= chamberQ[planes[iplane]];
2503 }
2504
2505 TMath::Sort((Int_t)kNConfigs, tconfig, configs, kTRUE);
2506 // AliInfo(Form("q[%d] = %f", configs[0], tconfig[configs[0]]));
2507 // AliInfo(Form("q[%d] = %f", configs[1], tconfig[configs[1]]));
2508 // AliInfo(Form("q[%d] = %f", configs[2], tconfig[configs[2]]));
2509
2510 return tconfig[configs[0]];
e4f2f73d 2511}
2512
2513//____________________________________________________________________
e17f4785 2514Int_t AliTRDtrackerV1::MakeSeeds(AliTRDtrackingChamber **stack, AliTRDseedV1 * const sseed, const Int_t * const ipar)
e4f2f73d 2515{
afa21247 2516//
2a3191bb 2517// Seed tracklets and build candidate TRD tracks. The procedure is used during barrel tracking to account for tracks which are
2518// either missed by TPC prolongation or conversions inside the TRD volume.
2519// For stand alone tracking the procedure is used to estimate all tracks measured by TRD.
afa21247 2520//
2521// Parameters :
2522// layers : Array of stack propagation layers containing clusters
2523// sseed : Array of empty tracklet seeds. On exit they are filled.
2524// ipar : Control parameters:
2525// ipar[0] -> seeding chambers configuration
2526// ipar[1] -> stack index
2527// ipar[2] -> number of track candidates found so far
2528//
2529// Output :
2530// Number of tracks candidates found.
2531//
2532// The following steps are performed:
2533// 1. Build seeding layers by collapsing all time bins from each of the four seeding chambers along the
2534// radial coordinate. See AliTRDtrackingChamber::GetSeedingLayer() for details. The chambers selection for seeding
2535// is described in AliTRDtrackerV1::Clusters2TracksStack().
2536// 2. Using the seeding clusters from the seeding layer (step 1) build combinatorics using the following algorithm:
2537// - for each seeding cluster in the lower seeding layer find
2538// - all seeding clusters in the upper seeding layer inside a road defined by a given phi angle. The angle
2539// is calculated on the minimum pt of tracks from vertex accesible to the stand alone tracker.
2540// - for each pair of two extreme seeding clusters select middle upper cluster using roads defined externally by the
2541// reco params
2542// - select last seeding cluster as the nearest to the linear approximation of the track described by the first three
2543// seeding clusters.
2544// The implementation of road calculation and cluster selection can be found in the functions AliTRDchamberTimeBin::BuildCond()
2545// and AliTRDchamberTimeBin::GetClusters().
2546// 3. Helix fit of the seeding clusters set. (see AliTRDtrackerFitter::FitRieman(AliTRDcluster**)). No tilt correction is
2547// performed at this level
2548// 4. Initialize seeding tracklets in the seeding chambers.
2549// 5. *Filter 0* Chi2 cut on the Y and Z directions. The threshold is set externally by the reco params.
2550// 6. Attach (true) clusters to seeding tracklets (see AliTRDseedV1::AttachClusters()) and fit tracklet (see
2551// AliTRDseedV1::Fit()). The number of used clusters used by current seeds should not exceed ... (25).
2552// 7. *Filter 1* Check if all 4 seeding tracklets are correctly constructed.
2553// 8. Helix fit of the clusters from the seeding tracklets with tilt correction. Refit tracklets using the new
2554// approximation of the track.
2555// 9. *Filter 2* Calculate likelihood of the track. (See AliTRDtrackerV1::CookLikelihood()). The following quantities are
2556// checked against the Riemann fit:
2557// - position resolution in y
2558// - angular resolution in the bending plane
2559// - likelihood of the number of clusters attached to the tracklet
2560// 10. Extrapolation of the helix fit to the other 2 chambers *non seeding* chambers:
2561// - Initialization of extrapolation tracklets with the fit parameters
2562// - Attach clusters to extrapolated tracklets
2563// - Helix fit of tracklets
2564// 11. Improve seeding tracklets quality by reassigning clusters based on the last parameters of the track
2565// See AliTRDtrackerV1::ImproveSeedQuality() for details.
2566// 12. Helix fit of all 6 seeding tracklets and chi2 calculation
2567// 13. Hyperplane fit and track quality calculation. See AliTRDtrackerFitter::FitHyperplane() for details.
2568// 14. Cooking labels for tracklets. Should be done only for MC
2569// 15. Register seeds.
2570//
2571// Authors:
2572// Marian Ivanov <M.Ivanov@gsi.de>
2573// Alexandru Bercuci <A.Bercuci@gsi.de>
2574// Markus Fasel <M.Fasel@gsi.de>
41702fec 2575
4d6aee34 2576 AliTRDtrackingChamber *chamber = NULL;
2577 AliTRDcluster *c[kNSeedPlanes] = {NULL, NULL, NULL, NULL}; // initilize seeding clusters
e17f4785 2578 AliTRDseedV1 *cseed = &sseed[0]; // initialize tracklets for first track
41702fec 2579 Int_t ncl, mcl; // working variable for looping over clusters
2580 Int_t index[AliTRDchamberTimeBin::kMaxClustersLayer], jndex[AliTRDchamberTimeBin::kMaxClustersLayer];
2581 // chi2 storage
2582 // chi2[0] = tracklet chi2 on the Z direction
2583 // chi2[1] = tracklet chi2 on the R direction
2584 Double_t chi2[4];
2585
afa21247 2586 // this should be data member of AliTRDtrack TODO
41702fec 2587 Double_t seedQuality[kMaxTracksStack];
2588
2589 // unpack control parameters
2590 Int_t config = ipar[0];
2591 Int_t ntracks = ipar[1];
d931f2aa 2592 Int_t istack = ipar[2];
41702fec 2593 Int_t planes[kNSeedPlanes]; GetSeedingConfig(config, planes);
afa21247 2594 Int_t planesExt[kNPlanes-kNSeedPlanes]; GetExtrapolationConfig(config, planesExt);
be24510a 2595
2596
41702fec 2597 // Init chambers geometry
41702fec 2598 Double_t hL[kNPlanes]; // Tilting angle
2599 Float_t padlength[kNPlanes]; // pad lenghts
dd8059a8 2600 Float_t padwidth[kNPlanes]; // pad widths
4d6aee34 2601 AliTRDpadPlane *pp = NULL;
41702fec 2602 for(int iplane=0; iplane<kNPlanes; iplane++){
2603 pp = fGeom->GetPadPlane(iplane, istack);
bb79ccd5 2604 hL[iplane] = TMath::Tan(TMath::DegToRad()*pp->GetTiltingAngle());
41702fec 2605 padlength[iplane] = pp->GetLengthIPad();
dd8059a8 2606 padwidth[iplane] = pp->GetWidthIPad();
41702fec 2607 }
2608
eb2b4f91 2609 // Init anode wire position for chambers
e165b64b 2610 Double_t x0[kNPlanes], // anode wire position
eb2b4f91 2611 driftLength = .5*AliTRDgeometry::AmThick() - AliTRDgeometry::DrThick(); // drift length
4d6aee34 2612 TGeoHMatrix *matrix = NULL;
eb2b4f91 2613 Double_t loc[] = {AliTRDgeometry::AnodePos(), 0., 0.};
2614 Double_t glb[] = {0., 0., 0.};
2615 AliTRDtrackingChamber **cIter = &stack[0];
a3743898 2616 for(int iLayer=0; iLayer<kNPlanes; iLayer++,cIter++){
eb2b4f91 2617 if(!(*cIter)) continue;
e165b64b 2618 if(!(matrix = fGeom->GetClusterMatrix((*cIter)->GetDetector()))){
2619 continue;
2620 x0[iLayer] = fgkX0[iLayer];
2621 }
eb2b4f91 2622 matrix->LocalToMaster(loc, glb);
2623 x0[iLayer] = glb[0];
2624 }
2625
980d5a2a 2626 AliDebug(2, Form("Making seeds Stack[%d] Config[%d] Tracks[%d]...", istack, config, ntracks));
41702fec 2627
d931f2aa 2628 // Build seeding layers
d611c74f 2629 ResetSeedTB();
41702fec 2630 Int_t nlayers = 0;
41702fec 2631 for(int isl=0; isl<kNSeedPlanes; isl++){
2632 if(!(chamber = stack[planes[isl]])) continue;
4d6aee34 2633 if(!chamber->GetSeedingLayer(fSeedTB[isl], fGeom, fkReconstructor)) continue;
41702fec 2634 nlayers++;
41702fec 2635 }
eb2b4f91 2636 if(nlayers < kNSeedPlanes) return ntracks;
41702fec 2637
2638
2639 // Start finding seeds
2640 Double_t cond0[4], cond1[4], cond2[4];
2641 Int_t icl = 0;
d611c74f 2642 while((c[3] = (*fSeedTB[3])[icl++])){
41702fec 2643 if(!c[3]) continue;
d611c74f 2644 fSeedTB[0]->BuildCond(c[3], cond0, 0);
2645 fSeedTB[0]->GetClusters(cond0, index, ncl);
41702fec 2646 //printf("Found c[3] candidates 0 %d\n", ncl);
2647 Int_t jcl = 0;
2648 while(jcl<ncl) {
d611c74f 2649 c[0] = (*fSeedTB[0])[index[jcl++]];
41702fec 2650 if(!c[0]) continue;
2651 Double_t dx = c[3]->GetX() - c[0]->GetX();
afa21247 2652 Double_t dzdx = (c[3]->GetZ() - c[0]->GetZ())/dx;
2653 Double_t dydx = (c[3]->GetY() - c[0]->GetY())/dx;
2654 fSeedTB[1]->BuildCond(c[0], cond1, 1, dzdx, dydx);
d611c74f 2655 fSeedTB[1]->GetClusters(cond1, jndex, mcl);
41702fec 2656 //printf("Found c[0] candidates 1 %d\n", mcl);
2657
2658 Int_t kcl = 0;
2659 while(kcl<mcl) {
d611c74f 2660 c[1] = (*fSeedTB[1])[jndex[kcl++]];
2661 if(!c[1]) continue;
afa21247 2662 fSeedTB[2]->BuildCond(c[1], cond2, 2, dzdx, dydx);
d611c74f 2663 c[2] = fSeedTB[2]->GetNearestCluster(cond2);
2664 //printf("Found c[1] candidate 2 %p\n", c[2]);
2665 if(!c[2]) continue;
980d5a2a 2666
2667 AliDebug(3, Form("Seeding clusters\n 0[%6.3f %6.3f %6.3f]\n 1[%6.3f %6.3f %6.3f]\n 2[%6.3f %6.3f %6.3f]\n 3[%6.3f %6.3f %6.3f].",
2668 c[0]->GetX(), c[0]->GetY(), c[0]->GetZ(),
2669 c[1]->GetX(), c[1]->GetY(), c[1]->GetZ(),
2670 c[2]->GetX(), c[2]->GetY(), c[2]->GetZ(),
2671 c[3]->GetX(), c[3]->GetY(), c[3]->GetZ()));
d611c74f 2672
804bb02e 2673 for (Int_t il = 0; il < kNPlanes; il++) cseed[il].Reset();
41702fec 2674
d611c74f 2675 FitRieman(c, chi2);
2676
d931f2aa 2677 AliTRDseedV1 *tseed = &cseed[0];
bb2db46c 2678 cIter = &stack[0];
2679 for(int iLayer=0; iLayer<kNPlanes; iLayer++, tseed++, cIter++){
2680 Int_t det = (*cIter) ? (*cIter)->GetDetector() : -1;
eb2b4f91 2681 tseed->SetDetector(det);
43d6ad34 2682 tseed->SetTilt(hL[iLayer]);
2683 tseed->SetPadLength(padlength[iLayer]);
dd8059a8 2684 tseed->SetPadWidth(padwidth[iLayer]);
4d6aee34 2685 tseed->SetReconstructor(fkReconstructor);
eb2b4f91 2686 tseed->SetX0(det<0 ? fR[iLayer]+driftLength : x0[iLayer]);
d611c74f 2687 tseed->Init(GetRiemanFitter());
f29f13a6 2688 tseed->SetStandAlone(kTRUE);
d611c74f 2689 }
2690
2691 Bool_t isFake = kFALSE;
a2fbb6ec 2692 if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) >= 2 && fkReconstructor->IsDebugStreaming()){
d611c74f 2693 if (c[0]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
2694 if (c[1]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
2695 if (c[2]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
2696
2697 Double_t xpos[4];
2698 for(Int_t l = 0; l < kNSeedPlanes; l++) xpos[l] = fSeedTB[l]->GetX();
2699 Float_t yref[4];
2700 for(int il=0; il<4; il++) yref[il] = cseed[planes[il]].GetYref(0);
2701 Int_t ll = c[3]->GetLabel(0);
2702 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2703 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2704 AliRieman *rim = GetRiemanFitter();
a2fbb6ec 2705 TTreeSRedirector &cs0 = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
d611c74f 2706 cs0 << "MakeSeeds0"
2707 <<"EventNumber=" << eventNumber
2708 <<"CandidateNumber=" << candidateNumber
2709 <<"isFake=" << isFake
2710 <<"config=" << config
2711 <<"label=" << ll
2712 <<"chi2z=" << chi2[0]
2713 <<"chi2y=" << chi2[1]
2714 <<"Y2exp=" << cond2[0]
2715 <<"Z2exp=" << cond2[1]
2716 <<"X0=" << xpos[0] //layer[sLayer]->GetX()
2717 <<"X1=" << xpos[1] //layer[sLayer + 1]->GetX()
2718 <<"X2=" << xpos[2] //layer[sLayer + 2]->GetX()
2719 <<"X3=" << xpos[3] //layer[sLayer + 3]->GetX()
2720 <<"yref0=" << yref[0]
2721 <<"yref1=" << yref[1]
2722 <<"yref2=" << yref[2]
2723 <<"yref3=" << yref[3]
2724 <<"c0.=" << c[0]
2725 <<"c1.=" << c[1]
2726 <<"c2.=" << c[2]
2727 <<"c3.=" << c[3]
2728 <<"Seed0.=" << &cseed[planes[0]]
2729 <<"Seed1.=" << &cseed[planes[1]]
2730 <<"Seed2.=" << &cseed[planes[2]]
2731 <<"Seed3.=" << &cseed[planes[3]]
2732 <<"RiemanFitter.=" << rim
2733 <<"\n";
2734 }
4d6aee34 2735 if(chi2[0] > fkReconstructor->GetRecoParam() ->GetChi2Z()/*7./(3. - sLayer)*//*iter*/){
980d5a2a 2736 AliDebug(3, Form("Filter on chi2Z [%f].", chi2[0]));
d611c74f 2737 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2738 continue;
2739 }
4d6aee34 2740 if(chi2[1] > fkReconstructor->GetRecoParam() ->GetChi2Y()/*1./(3. - sLayer)*//*iter*/){
980d5a2a 2741 AliDebug(3, Form("Filter on chi2Y [%f].", chi2[1]));
d611c74f 2742 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2743 continue;
2744 }
2745 //AliInfo("Passed chi2 filter.");
2746
2747 // try attaching clusters to tracklets
6e39bde4 2748 Int_t mlayers = 0;
980d5a2a 2749 AliTRDcluster *cl = NULL;
be24510a 2750 for(int iLayer=0; iLayer<kNSeedPlanes; iLayer++){
d611c74f 2751 Int_t jLayer = planes[iLayer];
980d5a2a 2752 Int_t nNotInChamber = 0;
f29f13a6 2753 if(!cseed[jLayer].AttachClusters(stack[jLayer], kTRUE)) continue;
980d5a2a 2754 if(/*fkReconstructor->IsHLT()*/kFALSE){
2755 cseed[jLayer].UpdateUsed();
2756 if(!cseed[jLayer].IsOK()) continue;
2757 }else{
2758 cseed[jLayer].Fit();
2759 cseed[jLayer].UpdateUsed();
2760 cseed[jLayer].ResetClusterIter();
2761 while((cl = cseed[jLayer].NextCluster())){
2762 if(!cl->IsInChamber()) nNotInChamber++;
2763 }
2764 //printf("clusters[%d], used[%d], not in chamber[%d]\n", cseed[jLayer].GetN(), cseed[jLayer].GetNUsed(), nNotInChamber);
2765 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
2766 }
d611c74f 2767 mlayers++;
2768 }
be24510a 2769
2770 if(mlayers < kNSeedPlanes){
980d5a2a 2771 AliDebug(2, Form("Found only %d tracklets out of %d. Skip.", mlayers, kNSeedPlanes));
be24510a 2772 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2773 continue;
2774 }
2775
2776 // temporary exit door for the HLT
4d6aee34 2777 if(fkReconstructor->IsHLT()){
be24510a 2778 // attach clusters to extrapolation chambers
2779 for(int iLayer=0; iLayer<kNPlanes-kNSeedPlanes; iLayer++){
2780 Int_t jLayer = planesExt[iLayer];
2781 if(!(chamber = stack[jLayer])) continue;
980d5a2a 2782 if(!cseed[jLayer].AttachClusters(chamber, kTRUE)) continue;
5f1ae1e7 2783 cseed[jLayer].Fit();
be24510a 2784 }
4302c900 2785 fTrackQuality[ntracks] = 1.; // dummy value
2786 ntracks++;
218ba867 2787 if(ntracks == kMaxTracksStack) return ntracks;
4302c900 2788 cseed += 6;
2789 continue;
2790 }
2791
be24510a 2792
f29f13a6 2793 // Update Seeds and calculate Likelihood
d611c74f 2794 // fit tracklets and cook likelihood
f29f13a6 2795 FitTiltedRieman(&cseed[0], kTRUE);
2796 for(int iLayer=0; iLayer<kNSeedPlanes; iLayer++){
2797 Int_t jLayer = planes[iLayer];
2798 cseed[jLayer].Fit(kTRUE);
2799 }
91834b8d 2800 Double_t like = CookLikelihood(&cseed[0], planes); // to be checked
d611c74f 2801
4d6aee34 2802 if (TMath::Log(1.E-9 + like) < fkReconstructor->GetRecoParam() ->GetTrackLikelihood()){
980d5a2a 2803 AliDebug(3, Form("Filter on likelihood %f[%e].", TMath::Log(1.E-9 + like), like));
d611c74f 2804 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2805 continue;
2806 }
2807 //AliInfo(Form("Passed likelihood %f[%e].", TMath::Log(1.E-9 + like), like));
2808
2809 // book preliminary results
2810 seedQuality[ntracks] = like;
2811 fSeedLayer[ntracks] = config;/*sLayer;*/
2812
2813 // attach clusters to the extrapolation seeds
980d5a2a 2814 Int_t elayers(0);
be24510a 2815 for(int iLayer=0; iLayer<kNPlanes-kNSeedPlanes; iLayer++){
2816 Int_t jLayer = planesExt[iLayer];
d611c74f 2817 if(!(chamber = stack[jLayer])) continue;
d611c74f 2818
2819 // fit extrapolated seed
2820 if ((jLayer == 0) && !(cseed[1].IsOK())) continue;
2821 if ((jLayer == 5) && !(cseed[4].IsOK())) continue;
2822 AliTRDseedV1 pseed = cseed[jLayer];
f29f13a6 2823 if(!pseed.AttachClusters(chamber, kTRUE)) continue;
2824 pseed.Fit(kTRUE);
d611c74f 2825 cseed[jLayer] = pseed;
d611c74f 2826 FitTiltedRieman(cseed, kTRUE);
f29f13a6 2827 cseed[jLayer].Fit(kTRUE);
980d5a2a 2828 elayers++;
d611c74f 2829 }
2830
2831 // AliInfo("Extrapolation done.");
2832 // Debug Stream containing all the 6 tracklets
a2fbb6ec 2833 if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) >= 2 && fkReconstructor->IsDebugStreaming()){
2834 TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
d611c74f 2835 TLinearFitter *tiltedRieman = GetTiltedRiemanFitter();
2836 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2837 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2838 cstreamer << "MakeSeeds1"
2839 << "EventNumber=" << eventNumber
2840 << "CandidateNumber=" << candidateNumber
2841 << "S0.=" << &cseed[0]
2842 << "S1.=" << &cseed[1]
2843 << "S2.=" << &cseed[2]
2844 << "S3.=" << &cseed[3]
2845 << "S4.=" << &cseed[4]
2846 << "S5.=" << &cseed[5]
2847 << "FitterT.=" << tiltedRieman
2848 << "\n";
2849 }
2850
980d5a2a 2851 if(fkReconstructor->GetRecoParam()->HasImproveTracklets()){
2852 AliTRDseedV1 bseed[AliTRDgeometry::kNlayer];
2853 for(Int_t jLayer=AliTRDgeometry::kNlayer; jLayer--;) bseed[jLayer] = cseed[jLayer];
2854
2855 if(ImproveSeedQuality(stack, cseed) < mlayers+elayers){
2856 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2857 AliDebug(3, "Filter on improve seeds.");
2858 } else {
2859 // store results
2860 for(Int_t jLayer=AliTRDgeometry::kNlayer; jLayer--;) cseed[jLayer] = bseed[jLayer];
2861 }
d611c74f 2862 }
2863 //AliInfo("Improve seed quality done.");
2864
2865 // fit full track and cook likelihoods
2866 // Double_t curv = FitRieman(&cseed[0], chi2);
2867 // Double_t chi2ZF = chi2[0] / TMath::Max((mlayers - 3.), 1.);
2868 // Double_t chi2RF = chi2[1] / TMath::Max((mlayers - 3.), 1.);
2869
2870 // do the final track fitting (Once with vertex constraint and once without vertex constraint)
2871 Double_t chi2Vals[3];
6e39bde4 2872 chi2Vals[0] = FitTiltedRieman(&cseed[0], kTRUE);
a2fbb6ec 2873 if(fkReconstructor->GetRecoParam()->IsVertexConstrained())
d611c74f 2874 chi2Vals[1] = FitTiltedRiemanConstraint(&cseed[0], GetZ()); // Do Vertex Constrained fit if desired
2875 else
2876 chi2Vals[1] = 1.;
2877 chi2Vals[2] = GetChi2Z(&cseed[0]) / TMath::Max((mlayers - 3.), 1.);
2878 // Chi2 definitions in testing stage
2879 //chi2Vals[2] = GetChi2ZTest(&cseed[0]);
2880 fTrackQuality[ntracks] = CalculateTrackLikelihood(&cseed[0], &chi2Vals[0]);
2881 //AliInfo("Hyperplane fit done\n");
fac58f00 2882
a2fbb6ec 2883 if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) >= 2 && fkReconstructor->IsDebugStreaming()){
2884 TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
d611c74f 2885 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2886 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2887 TLinearFitter *fitterTC = GetTiltedRiemanFitterConstraint();
2888 TLinearFitter *fitterT = GetTiltedRiemanFitter();
91834b8d 2889 Int_t ncls = 0;
2890 for(Int_t iseed = 0; iseed < kNPlanes; iseed++){
2891 ncls += cseed[iseed].IsOK() ? cseed[iseed].GetN2() : 0;
2892 }
d611c74f 2893 cstreamer << "MakeSeeds2"
2894 << "EventNumber=" << eventNumber
2895 << "CandidateNumber=" << candidateNumber
2896 << "Chi2TR=" << chi2Vals[0]
2897 << "Chi2TC=" << chi2Vals[1]
2898 << "Nlayers=" << mlayers
91834b8d 2899 << "NClusters=" << ncls
d611c74f 2900 << "Like=" << like
2901 << "S0.=" << &cseed[0]
2902 << "S1.=" << &cseed[1]
2903 << "S2.=" << &cseed[2]
2904 << "S3.=" << &cseed[3]
2905 << "S4.=" << &cseed[4]
2906 << "S5.=" << &cseed[5]
d611c74f 2907 << "FitterT.=" << fitterT
2908 << "FitterTC.=" << fitterTC
2909 << "\n";
2910 }
2911
2912 ntracks++;
2913 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2914 if(ntracks == kMaxTracksStack){
2915 AliWarning(Form("Number of seeds reached maximum allowed (%d) in stack.", kMaxTracksStack));
2916 return ntracks;
2917 }
2918 cseed += 6;
41702fec 2919 }
2920 }
2921 }
41702fec 2922
2923 return ntracks;
e4f2f73d 2924}
2925
2926//_____________________________________________________________________________
e17f4785 2927AliTRDtrackV1* AliTRDtrackerV1::MakeTrack(AliTRDseedV1 * const seeds, Double_t *params)
e4f2f73d 2928{
afa21247 2929//
2930// Build a TRD track out of tracklet candidates
2931//
2932// Parameters :
2933// seeds : array of tracklets
2934// params : array of track parameters as they are estimated by stand alone tracker. 7 elements.
2935// [0] - radial position of the track at reference point
2936// [1] - y position of the fit at [0]
2937// [2] - z position of the fit at [0]
2938// [3] - snp of the first tracklet
2939// [4] - tgl of the first tracklet
2940// [5] - curvature of the Riemann fit - 1/pt
2941// [6] - sector rotation angle
2942//
2943// Output :
2944// The TRD track.
2945//
2946// Initialize the TRD track based on the parameters of the fit and a parametric covariance matrix
2947// (diagonal with constant variance terms TODO - correct parameterization)
2948//
2949// In case of HLT just register the tracklets in the tracker and return values of the Riemann fit. For the
2950// offline case perform a full Kalman filter on the already found tracklets (see AliTRDtrackerV1::FollowBackProlongation()
2951// for details). Do also MC label calculation and PID if propagation successfully.
41702fec 2952
afa21247 2953
41702fec 2954 Double_t alpha = AliTRDgeometry::GetAlpha();
2955 Double_t shift = AliTRDgeometry::GetAlpha()/2.0;
2956 Double_t c[15];
2957
afa21247 2958 c[ 0] = 0.2; // s^2_y
2959 c[ 1] = 0.0; c[ 2] = 2.0; // s^2_z
2960 c[ 3] = 0.0; c[ 4] = 0.0; c[ 5] = 0.02; // s^2_snp
2961 c[ 6] = 0.0; c[ 7] = 0.0; c[ 8] = 0.0; c[ 9] = 0.1; // s^2_tgl
2962 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 2963
d20df6fc 2964 AliTRDtrackV1 track(seeds, &params[1], c, params[0], params[6]*alpha+shift);
2965 track.PropagateTo(params[0]-5.0);
4d6aee34 2966 AliTRDseedV1 *ptrTracklet = NULL;
9887cc9f 2967
2968 // skip Kalman filter for HLT
5f1ae1e7 2969 if(/*fkReconstructor->IsHLT()*/kFALSE){
9887cc9f 2970 for (Int_t jLayer = 0; jLayer < AliTRDgeometry::kNlayer; jLayer++) {
2971 track.UnsetTracklet(jLayer);
e17f4785 2972 ptrTracklet = &seeds[jLayer];
9887cc9f 2973 if(!ptrTracklet->IsOK()) continue;
5f1ae1e7 2974 if(TMath::Abs(ptrTracklet->GetYref(1) - ptrTracklet->GetYfit(1)) >= .2) continue; // check this condition with Marian
9887cc9f 2975 ptrTracklet = SetTracklet(ptrTracklet);
f29f13a6 2976 ptrTracklet->UseClusters();
91834b8d 2977 track.SetTracklet(ptrTracklet, fTracklets->GetEntriesFast()-1);
2978 }
d78d7df0 2979 AliTRDtrackV1 *ptrTrack = SetTrack(&track);
799e38d7 2980 ptrTrack->CookPID();
5f1ae1e7 2981 ptrTrack->CookLabel(.9);
4d6aee34 2982 ptrTrack->SetReconstructor(fkReconstructor);
d78d7df0 2983 return ptrTrack;
91834b8d 2984 }
393fda1c 2985
b1135f96 2986 // prevent the error message in AliTracker::MeanMaterialBudget: "start point out of geometry"
2987 if(TMath::Abs(track.GetX()) + TMath::Abs(track.GetY()) + TMath::Abs(track.GetZ()) > 10000)
17e0e535 2988 return NULL;
2989
d20df6fc 2990 track.ResetCovariance(1);
e79f8eb0 2991 Int_t nc = TMath::Abs(FollowBackProlongation(track));
a2fbb6ec 2992 if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) > 5 && fkReconstructor->IsDebugStreaming()){
393fda1c 2993 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2994 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2995 Double_t p[5]; // Track Params for the Debug Stream
2996 track.GetExternalParameters(params[0], p);
a2fbb6ec 2997 TTreeSRedirector &cs = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
393fda1c 2998 cs << "MakeTrack"
2999 << "EventNumber=" << eventNumber
3000 << "CandidateNumber=" << candidateNumber
3001 << "nc=" << nc
3002 << "X=" << params[0]
3003 << "Y=" << p[0]
3004 << "Z=" << p[1]
3005 << "snp=" << p[2]
3006 << "tnd=" << p[3]
3007 << "crv=" << p[4]
3008 << "Yin=" << params[1]
3009 << "Zin=" << params[2]
3010 << "snpin=" << params[3]
3011 << "tndin=" << params[4]
3012 << "crvin=" << params[5]
3013 << "track.=" << &track
3014 << "\n";
3015 }
4d6aee34 3016 if (nc < 30) return NULL;
d20df6fc 3017
3018 AliTRDtrackV1 *ptrTrack = SetTrack(&track);
4d6aee34 3019 ptrTrack->SetReconstructor(fkReconstructor);
48f8adf3 3020 ptrTrack->CookLabel(.9);
24253b0a 3021
d20df6fc 3022 // computes PID for track
3023 ptrTrack->CookPID();
3024 // update calibration references using this track
48f8adf3 3025 AliTRDCalibraFillHisto *calibra = AliTRDCalibraFillHisto::Instance();
3026 if (!calibra){
3027 AliInfo("Could not get Calibra instance\n");
3028 if(calibra->GetHisto2d()) calibra->UpdateHistogramsV1(ptrTrack);
3029 }
d20df6fc 3030 return ptrTrack;
e4f2f73d 3031}
3032
0906e73e 3033
3034//____________________________________________________________________
eb38ed55 3035Int_t AliTRDtrackerV1::ImproveSeedQuality(AliTRDtrackingChamber **stack, AliTRDseedV1 *cseed)
e4f2f73d 3036{
41702fec 3037 //
3038 // Sort tracklets according to "quality" and try to "improve" the first 4 worst
3039 //
3040 // Parameters :
3041 // layers : Array of propagation layers for a stack/supermodule
3042 // cseed : Array of 6 seeding tracklets which has to be improved
3043 //
f29f13a6 3044 // Output :
41702fec 3045 // cssed : Improved seeds
3046 //
3047 // Detailed description
3048 //
3049 // Iterative procedure in which new clusters are searched for each
3050 // tracklet seed such that the seed quality (see AliTRDseed::GetQuality())
3051 // can be maximized. If some optimization is found the old seeds are replaced.
3052 //
3053 // debug level: 7
3054 //
3055
3056 // make a local working copy
4d6aee34 3057 AliTRDtrackingChamber *chamber = NULL;
980d5a2a 3058 AliTRDseedV1 bseed[AliTRDgeometry::kNlayer];
3059
3060 Float_t quality(0.),
3061 lQuality[] = {1.e3, 1.e3, 1.e3, 1.e3, 1.e3, 1.e3};
3062 Int_t rLayers(0);
3063 for(Int_t jLayer=AliTRDgeometry::kNlayer; jLayer--;){
3064 bseed[jLayer] = cseed[jLayer];
3065 if(!bseed[jLayer].IsOK()) continue;
3066 rLayers++;
3067 lQuality[jLayer] = bseed[jLayer].GetQuality(kTRUE);
3068 quality += lQuality[jLayer];
3069 }
3070 Float_t chi2 = FitTiltedRieman(bseed, kTRUE);
41702fec 3071
3072 for (Int_t iter = 0; iter < 4; iter++) {
560e5c05 3073 AliDebug(2, Form("Iter[%d] Q[%f] chi2[%f]", iter, quality, chi2));
3074
980d5a2a 3075 // Try better cluster set
3076 Int_t nLayers(0); Float_t qualitynew(0.);
3077 Int_t indexes[6];
3078 TMath::Sort(Int_t(AliTRDgeometry::kNlayer), lQuality, indexes, kFALSE);
3079 for(Int_t jLayer=AliTRDgeometry::kNlayer; jLayer--;) {
3080 Int_t bLayer = indexes[jLayer];
3081 bseed[bLayer].Reset("c");
41702fec 3082 if(!(chamber = stack[bLayer])) continue;
980d5a2a 3083 if(!bseed[bLayer].AttachClusters(chamber, kTRUE)) continue;
f29f13a6 3084 bseed[bLayer].Fit(kTRUE);
980d5a2a 3085 if(!bseed[bLayer].IsOK()) continue;
3086 nLayers++;
3087 lQuality[jLayer] = bseed[jLayer].GetQuality(kTRUE);
3088 qualitynew += lQuality[jLayer];
41702fec 3089 }
980d5a2a 3090 if(rLayers > nLayers){
3091 AliDebug(1, Form("Lost %d tracklets while improving.", rLayers-nLayers));
3092 break;
3093 } else rLayers=nLayers;
3094
3095 if(qualitynew >= quality){
3096 AliDebug(4, Form("Quality worsen in iter[%d].", iter));
3097 break;
3098 } else quality = qualitynew;
3099
3100 // try improve track parameters
3101 AliTRDseedV1 tseed[AliTRDgeometry::kNlayer];
3102 for(Int_t jLayer=AliTRDgeometry::kNlayer; jLayer--;) tseed[jLayer]=bseed[jLayer];
3103 Float_t chi2new = FitTiltedRieman(tseed, kTRUE);
3104 if(chi2new > chi2){
3105 AliDebug(4, Form("Chi2 worsen in iter[%d].", iter));
3106 break;
3107 } else chi2 = chi2new;
3108
3109 // store better tracklets
3110 for(Int_t jLayer=AliTRDgeometry::kNlayer; jLayer--;) bseed[jLayer]=tseed[jLayer];
3111
41702fec 3112
a2fbb6ec 3113 if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) >= 7 && fkReconstructor->IsDebugStreaming()){
41702fec 3114 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
3115 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
3116 TLinearFitter *tiltedRieman = GetTiltedRiemanFitter();
a2fbb6ec 3117 TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
41702fec 3118 cstreamer << "ImproveSeedQuality"
980d5a2a 3119 << "EventNumber=" << eventNumber
3120 << "CandidateNumber=" << candidateNumber
3121 << "Iteration=" << iter
3122 << "S0.=" << &bseed[0]
3123 << "S1.=" << &bseed[1]
3124 << "S2.=" << &bseed[2]
3125 << "S3.=" << &bseed[3]
3126 << "S4.=" << &bseed[4]
3127 << "S5.=" << &bseed[5]
3128 << "FitterT.=" << tiltedRieman
3129 << "\n";
41702fec 3130 }
3131 } // Loop: iter
41702fec 3132 // we are sure that at least 2 tracklets are OK !
980d5a2a 3133 return rLayers;
e4f2f73d 3134}
3135
eb38ed55 3136//_________________________________________________________________________
4d6aee34 3137Double_t AliTRDtrackerV1::CalculateTrackLikelihood(const AliTRDseedV1 *const tracklets, Double_t *chi2){
41702fec 3138 //
3139 // Calculates the Track Likelihood value. This parameter serves as main quality criterion for
3140 // the track selection
3141 // The likelihood value containes:
3142 // - The chi2 values from the both fitters and the chi2 values in z-direction from a linear fit
3143 // - The Sum of the Parameter |slope_ref - slope_fit|/Sigma of the tracklets
3144 // For all Parameters an exponential dependency is used
3145 //
3146 // Parameters: - Array of tracklets (AliTRDseedV1) related to the track candidate
3147 // - Array of chi2 values:
3148 // * Non-Constrained Tilted Riemann fit
3149 // * Vertex-Constrained Tilted Riemann fit
3150 // * z-Direction from Linear fit
3151 // Output: - The calculated track likelihood
3152 //
3153 // debug level 2
3154 //
3155
f29f13a6 3156 Double_t chi2phi = 0, nLayers = 0;
41702fec 3157 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
3158 if(!tracklets[iLayer].IsOK()) continue;
f29f13a6 3159 chi2phi += tracklets[iLayer].GetChi2Phi();
41702fec 3160 nLayers++;
3161 }
f29f13a6 3162 chi2phi /= Float_t (nLayers - 2.0);
41702fec 3163
3164 Double_t likeChi2Z = TMath::Exp(-chi2[2] * 0.14); // Chi2Z
a2fbb6ec 3165 Double_t likeChi2TC = (fkReconstructor->GetRecoParam()->IsVertexConstrained()) ?
d20df6fc 3166 TMath::Exp(-chi2[1] * 0.677) : 1; // Constrained Tilted Riemann
6e39bde4 3167 Double_t likeChi2TR = TMath::Exp(-chi2[0] * 0.0078); // Non-constrained Tilted Riemann
3168 Double_t likeChi2Phi= TMath::Exp(-chi2phi * 3.23);//3.23
f29f13a6 3169 Double_t trackLikelihood = likeChi2Z * likeChi2TR * likeChi2Phi;
41702fec 3170
a2fbb6ec 3171 if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) >= 2 && fkReconstructor->IsDebugStreaming()){
41702fec