Modifications needed to use PID framework based mass during tracking and
[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
2f4384e6 64AliTRDtrackerV1::ETRDtrackerV1BetheBloch AliTRDtrackerV1::fgBB = AliTRDtrackerV1::kGeant;
d76231c8 65Double_t AliTRDtrackerV1::fgTopologicQA[kNConfigs] = {
6e39bde4 66 0.5112, 0.5112, 0.5112, 0.0786, 0.0786,
41702fec 67 0.0786, 0.0786, 0.0579, 0.0579, 0.0474,
68 0.0474, 0.0408, 0.0335, 0.0335, 0.0335
e165b64b 69};
70const Double_t AliTRDtrackerV1::fgkX0[kNPlanes] = {
71 300.2, 312.8, 325.4, 338.0, 350.6, 363.2};
952051c5 72// Number of Time Bins/chamber should be also stored independently by the traker
73// (also in AliTRDReconstructor) in oder to be able to run HLT. Fix TODO
2985ffcb 74Int_t AliTRDtrackerV1::fgNTimeBins = 0;
4d6aee34 75AliRieman* AliTRDtrackerV1::fgRieman = NULL;
76TLinearFitter* AliTRDtrackerV1::fgTiltedRieman = NULL;
77TLinearFitter* AliTRDtrackerV1::fgTiltedRiemanConstrained = NULL;
e4f2f73d 78
79//____________________________________________________________________
33ab3872 80AliTRDtrackerV1::AliTRDtrackerV1(const AliTRDReconstructor *rec)
41702fec 81 :AliTracker()
4d6aee34 82 ,fkReconstructor(NULL)
9e85cb05 83 ,fkRecoParam(NULL)
4d6aee34 84 ,fGeom(NULL)
85 ,fClusters(NULL)
86 ,fTracklets(NULL)
87 ,fTracks(NULL)
b1135f96 88 ,fTracksESD(NULL)
41702fec 89 ,fSieveSeeding(0)
9dcc64cc 90 ,fEventInFile(-1)
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);
ddfbc51a 127 fTracksESD->SetOwner();
eb38ed55 128}
129
e4f2f73d 130//____________________________________________________________________
131AliTRDtrackerV1::~AliTRDtrackerV1()
132{
41702fec 133 //
134 // Destructor
135 //
d2eba04b 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;}
d2eba04b 144 if(IsClustersOwner() && fClusters) {
145 AliInfo(Form("tracker[%p] removing %d own clusters @ %p", (void*)this, fClusters->GetEntries(), (void*)fClusters));
48f8adf3 146 fClusters->Delete(); delete fClusters;
147 }
41702fec 148 if(fGeom) delete fGeom;
e4f2f73d 149}
150
151//____________________________________________________________________
152Int_t AliTRDtrackerV1::Clusters2Tracks(AliESDEvent *esd)
153{
41702fec 154 //
155 // Steering stand alone tracking for full TRD detector
156 //
157 // Parameters :
158 // esd : The ESD event. On output it contains
159 // the ESD tracks found in TRD.
160 //
161 // Output :
162 // Number of tracks found in the TRD detector.
163 //
164 // Detailed description
165 // 1. Launch individual SM trackers.
166 // See AliTRDtrackerV1::Clusters2TracksSM() for details.
167 //
168
9e85cb05 169 if(!fkRecoParam){
3a039a31 170 AliError("Reconstruction configuration not initialized. Call first AliTRDReconstructor::SetRecoParam().");
41702fec 171 return 0;
172 }
173
174 //AliInfo("Start Track Finder ...");
175 Int_t ntracks = 0;
053767a4 176 for(int ism=0; ism<AliTRDgeometry::kNsector; ism++){
41702fec 177 // for(int ism=1; ism<2; ism++){
178 //AliInfo(Form("Processing supermodule %i ...", ism));
179 ntracks += Clusters2TracksSM(ism, esd);
180 }
980d5a2a 181 AliInfo(Form("Number of tracks: !TRDin[%d]", ntracks));
41702fec 182 return ntracks;
e4f2f73d 183}
184
0906e73e 185
186//_____________________________________________________________________________
eb38ed55 187Bool_t AliTRDtrackerV1::GetTrackPoint(Int_t index, AliTrackPoint &p) const
0906e73e 188{
41702fec 189 //AliInfo(Form("Asking for tracklet %d", index));
190
84eab75a 191 // reset position of the point before using it
192 p.SetXYZ(0., 0., 0.);
2f7514a6 193 AliTRDseedV1 *tracklet = GetTracklet(index);
194 if (!tracklet) return kFALSE;
84eab75a 195
41702fec 196 // get detector for this tracklet
e165b64b 197 Int_t det = tracklet->GetDetector();
198 Int_t sec = fGeom->GetSector(det);
199 Double_t alpha = (sec+.5)*AliTRDgeometry::GetAlpha(),
200 sinA = TMath::Sin(alpha),
201 cosA = TMath::Cos(alpha);
41702fec 202 Double_t local[3];
e165b64b 203 local[0] = tracklet->GetX();
204 local[1] = tracklet->GetY();
205 local[2] = tracklet->GetZ();
41702fec 206 Double_t global[3];
e165b64b 207 fGeom->RotateBack(det, local, global);
208
209 Double_t cov2D[3]; Float_t cov[6];
210 tracklet->GetCovAt(local[0], cov2D);
211 cov[0] = cov2D[0]*sinA*sinA;
212 cov[1] =-cov2D[0]*sinA*cosA;
213 cov[2] =-cov2D[1]*sinA;
214 cov[3] = cov2D[0]*cosA*cosA;
215 cov[4] = cov2D[1]*cosA;
216 cov[5] = cov2D[2];
217 // store the global position of the tracklet and its covariance matrix in the track point
218 p.SetXYZ(global[0],global[1],global[2], cov);
41702fec 219
220 // setting volume id
e165b64b 221 AliGeomManager::ELayerID iLayer = AliGeomManager::ELayerID(AliGeomManager::kTRD1+fGeom->GetLayer(det));
222 Int_t modId = fGeom->GetSector(det) * AliTRDgeometry::kNstack + fGeom->GetStack(det);
41702fec 223 UShort_t volid = AliGeomManager::LayerToVolUID(iLayer, modId);
224 p.SetVolumeID(volid);
225
226 return kTRUE;
0906e73e 227}
228
eb38ed55 229//____________________________________________________________________
230TLinearFitter* AliTRDtrackerV1::GetTiltedRiemanFitter()
231{
41702fec 232 if(!fgTiltedRieman) fgTiltedRieman = new TLinearFitter(4, "hyp4");
233 return fgTiltedRieman;
eb38ed55 234}
0906e73e 235
eb38ed55 236//____________________________________________________________________
237TLinearFitter* AliTRDtrackerV1::GetTiltedRiemanFitterConstraint()
238{
41702fec 239 if(!fgTiltedRiemanConstrained) fgTiltedRiemanConstrained = new TLinearFitter(2, "hyp2");
240 return fgTiltedRiemanConstrained;
eb38ed55 241}
41702fec 242
eb38ed55 243//____________________________________________________________________
244AliRieman* AliTRDtrackerV1::GetRiemanFitter()
245{
fac58f00 246 if(!fgRieman) fgRieman = new AliRieman(AliTRDseedV1::kNtb * AliTRDgeometry::kNlayer);
41702fec 247 return fgRieman;
eb38ed55 248}
41702fec 249
0906e73e 250//_____________________________________________________________________________
251Int_t AliTRDtrackerV1::PropagateBack(AliESDEvent *event)
252{
2a3191bb 253// Propagation of ESD tracks from TPC to TOF detectors and building of the TRD track. For building
254// a TRD track an ESD track is used as seed. The informations obtained on the TRD track (measured points,
255// covariance, PID, etc.) are than used to update the corresponding ESD track.
256// Each track seed is first propagated to the geometrical limit of the TRD detector.
257// Its prolongation is searched in the TRD and if corresponding clusters are found tracklets are
258// constructed out of them (see AliTRDseedV1::AttachClusters()) and the track is updated.
259// Otherwise the ESD track is left unchanged.
260//
261// The following steps are performed:
262// 1. Selection of tracks based on the variance in the y-z plane.
263// 2. Propagation to the geometrical limit of the TRD volume. If track propagation fails the AliESDtrack::kTRDStop is set.
264// 3. Prolongation inside the fiducial volume (see AliTRDtrackerV1::FollowBackProlongation()) and marking
265// the following status bits:
266// - AliESDtrack::kTRDin - if the tracks enters the TRD fiducial volume
267// - AliESDtrack::kTRDStop - if the tracks fails propagation
268// - AliESDtrack::kTRDbackup - if the tracks fulfills chi2 conditions and qualify for refitting
269// 4. Writting to friends, PID, MC label, quality etc. Setting status bit AliESDtrack::kTRDout.
270// 5. Propagation to TOF. If track propagation fails the AliESDtrack::kTRDStop is set.
271//
272
e3d45279 273 if(!fClusters || !fClusters->GetEntriesFast()){
274 AliInfo("No TRD clusters");
275 return 0;
276 }
2a3191bb 277 AliTRDCalibraFillHisto *calibra = AliTRDCalibraFillHisto::Instance(); // Calibration monitor
e3d45279 278 if (!calibra) AliInfo("Could not get Calibra instance");
c6f7c6cb 279 if (!fgNTimeBins) fgNTimeBins = fkReconstructor->GetNTimeBins();
828c6f80 280
eb2b4f91 281 // Define scalers
88987d18 282 Int_t nFound = 0, // number of tracks found
283 nBacked = 0, // number of tracks backed up for refit
284 nSeeds = 0, // total number of ESD seeds
285 nTRDseeds= 0, // number of seeds in the TRD acceptance
286 nTPCseeds= 0; // number of TPC seeds
41702fec 287 Float_t foundMin = 20.0;
88987d18 288
289 Float_t *quality = NULL;
290 Int_t *index = NULL;
9dcc64cc 291 fEventInFile = event->GetEventNumberInFile();
eb2b4f91 292 nSeeds = event->GetNumberOfTracks();
293 // Sort tracks according to quality
294 // (covariance in the yz plane)
295 if(nSeeds){
88987d18 296 quality = new Float_t[nSeeds];
297 index = new Int_t[4*nSeeds];
298 for (Int_t iSeed = nSeeds; iSeed--;) {
d611c74f 299 AliESDtrack *seed = event->GetTrack(iSeed);
300 Double_t covariance[15];
301 seed->GetExternalCovariance(covariance);
88987d18 302 quality[iSeed] = covariance[0] + covariance[2];
d611c74f 303 }
88987d18 304 TMath::Sort(nSeeds, quality, index,kFALSE);
41702fec 305 }
88987d18 306
eb2b4f91 307 // Propagate all seeds
41702fec 308 Int_t expectedClr;
309 AliTRDtrackV1 track;
88987d18 310 for (Int_t iSeed = 0; iSeed < nSeeds; iSeed++) {
311
312 // Get the seeds in sorted sequence
313 AliESDtrack *seed = event->GetTrack(index[iSeed]);
314 Float_t p4 = seed->GetC(seed->GetBz());
315
316 // Check the seed status
317 ULong_t status = seed->GetStatus();
318 if ((status & AliESDtrack::kTRDout) != 0) continue;
319 if ((status & AliESDtrack::kTPCout)){
320 AliDebug(3, Form("Prolongate seed[%2d] which is TPC.", iSeed));
321 // set steering parameters for TPC
322 //fkRecoParam->SetTrackParam(kTPC);
323/* } else {
324 if ((status & AliESDtrack::kITSout)){
325 AliDebug(3, Form("Prolongate seed[%2d] which is ITS.", iSeed));
326 // set steering parameters for ITS
327 //fkRecoParam->SetTrackParam(kITS);
328 // rotate
329 Float_t globalToTracking = AliTRDgeometry::GetAlpha()*(Int_t(seed->GetAlpha()/AliTRDgeometry::GetAlpha()) + (seed->GetAlpha()>0. ? 0.5 : -0.5));
330 if(!seed->Rotate(globalToTracking)) continue;
331 } else continue;*/
332 } else continue;
333
334 // Propagate to the entrance in the TRD mother volume
335 track.~AliTRDtrackV1();
336 new(&track) AliTRDtrackV1(*seed);
337 if(AliTRDgeometry::GetXtrdBeg() > (AliTRDReconstructor::GetMaxStep() + track.GetX()) && !PropagateToX(track, AliTRDgeometry::GetXtrdBeg(), AliTRDReconstructor::GetMaxStep())){
338 seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
339 continue;
340 }
341 if(!AdjustSector(&track)){
342 seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
343 continue;
344 }
345 if(TMath::Abs(track.GetSnp()) > AliTRDReconstructor::GetMaxSnp()) {
346 seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
347 continue;
348 }
349 nTPCseeds++;
350 AliDebug(2, Form("TRD propagate TPC seed[%d] = %d.", iSeed, index[iSeed]));
351 // store track status at TRD entrance
352 seed->UpdateTrackParams(&track, AliESDtrack::kTRDbackup);
353
354 // prepare track and do propagation in the TRD
355 track.SetReconstructor(fkReconstructor);
356 track.SetKink(Bool_t(seed->GetKinkIndex(0)));
357 track.SetPrimary(status & AliESDtrack::kTPCin);
358 expectedClr = FollowBackProlongation(track);
359 // check if track entered the TRD fiducial volume
360 if(track.GetTrackIn()){
361 seed->UpdateTrackParams(&track, AliESDtrack::kTRDin);
362 nTRDseeds++;
363 }
364 // check if track was stopped in the TRD
365 if (expectedClr<0){
366 seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
367 continue;
368 } else {
369 nFound++;
370 // compute PID
371 track.CookPID();
372 //compute MC label
373 track.CookLabel(1. - AliTRDReconstructor::GetLabelFraction());
374 // update calibration references using this track
375 if(calibra->GetHisto2d()) calibra->UpdateHistogramsV1(&track);
41702fec 376 // save calibration object
88987d18 377 if (fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 0) {
224f357f 378 AliTRDtrackV1 *calibTrack = new AliTRDtrackV1(track);
379 calibTrack->SetOwner();
380 seed->AddCalibObject(calibTrack);
381 }
88987d18 382 //update ESD track
383 seed->UpdateTrackParams(&track, AliESDtrack::kTRDout);
384 track.UpdateESDtrack(seed);
385 }
4b5b4c5b 386
88987d18 387 // Make backup for back propagation
388 if ((TMath::Abs(track.GetC(track.GetBz()) - p4) / TMath::Abs(p4) < 0.2) || (track.Pt() > 0.8)) {
389 Int_t foundClr = track.GetNumberOfClusters();
390 if (foundClr >= foundMin) {
391 //if(track.GetBackupTrack()) UseClusters(track.GetBackupTrack());
4b5b4c5b 392
88987d18 393 // Sign only gold tracks
394 if (track.GetChi2() / track.GetNumberOfClusters() < 4) {
395 //if ((seed->GetKinkIndex(0) == 0) && (track.Pt() < 1.5)) UseClusters(&track);
396 }
397 Bool_t isGold = kFALSE;
398
399 // Full gold track
400 if (track.GetChi2() / track.GetNumberOfClusters() < 5) {
401 if (track.GetBackupTrack()) seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup);
402 nBacked++;
403 isGold = kTRUE;
404 }
405
406 // Almost gold track
407 if ((!isGold) && (track.GetNCross() == 0) && (track.GetChi2() / track.GetNumberOfClusters() < 7)) {
408 //seed->UpdateTrackParams(track, AliESDtrack::kTRDbackup);
409 if (track.GetBackupTrack()) seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup);
410 nBacked++;
411 isGold = kTRUE;
412 }
413
414 if ((!isGold) && (track.GetBackupTrack())) {
415 if ((track.GetBackupTrack()->GetNumberOfClusters() > foundMin) && ((track.GetBackupTrack()->GetChi2()/(track.GetBackupTrack()->GetNumberOfClusters()+1)) < 7)) {
416 seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup);
4b5b4c5b 417 nBacked++;
418 isGold = kTRUE;
419 }
41702fec 420 }
41702fec 421 }
88987d18 422 }
423
424 // Propagation to the TOF
425 if(!(seed->GetStatus()&AliESDtrack::kTRDStop)) {
426 Int_t sm = track.GetSector();
427 // default value in case we have problems with the geometry.
428 Double_t xtof = 371.;
429 //Calculate radial position of the beginning of the TOF
430 //mother volume. In order to avoid mixing of the TRD
431 //and TOF modules some hard values are needed. This are:
432 //1. The path to the TOF module.
433 //2. The width of the TOF (29.05 cm)
434 //(with the help of Annalisa de Caro Mar-17-2009)
435 if(gGeoManager){
436 gGeoManager->cd(Form("/ALIC_1/B077_1/BSEGMO%d_1/BTOF%d_1", sm, sm));
437 TGeoHMatrix *m = NULL;
438 Double_t loc[]={0., 0., -.5*29.05}, glob[3];
439
440 if((m=gGeoManager->GetCurrentMatrix())){
441 m->LocalToMaster(loc, glob);
442 xtof = TMath::Sqrt(glob[0]*glob[0]+glob[1]*glob[1]);
4b5b4c5b 443 }
41702fec 444 }
88987d18 445 if(xtof > (AliTRDReconstructor::GetMaxStep() + track.GetX()) && !PropagateToX(track, xtof, AliTRDReconstructor::GetMaxStep())){
446 seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
447 continue;
448 }
449 if(!AdjustSector(&track)){
450 seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
451 continue;
452 }
453 if(TMath::Abs(track.GetSnp()) > AliTRDReconstructor::GetMaxSnp()){
454 seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
455 continue;
456 }
457 //seed->UpdateTrackParams(&track, AliESDtrack::kTRDout);
458 // TODO obsolete - delete
459 seed->SetTRDQuality(track.StatusForTOF());
41702fec 460 }
88987d18 461 seed->SetTRDBudget(track.GetBudget(0));
41702fec 462 }
88987d18 463 if(index) delete [] index;
464 if(quality) delete [] quality;
41702fec 465
88987d18 466 AliInfo(Form("Number of seeds: TPCout[%d] TRDin[%d]", nTPCseeds, nTRDseeds));
467 AliInfo(Form("Number of tracks: TRDout[%d] TRDbackup[%d]", nFound, nBacked));
d4cf71ca 468
d611c74f 469 // run stand alone tracking
4d6aee34 470 if (fkReconstructor->IsSeeding()) Clusters2Tracks(event);
41702fec 471
472 return 0;
0906e73e 473}
474
475
476//____________________________________________________________________
477Int_t AliTRDtrackerV1::RefitInward(AliESDEvent *event)
478{
41702fec 479 //
480 // Refits tracks within the TRD. The ESD event is expected to contain seeds
481 // at the outer part of the TRD.
482 // The tracks are propagated to the innermost time bin
483 // of the TRD and the ESD event is updated
484 // Origin: Thomas KUHR (Thomas.Kuhr@cern.ch)
485 //
486
487 Int_t nseed = 0; // contor for loaded seeds
488 Int_t found = 0; // contor for updated TRD tracks
489
490
e3d45279 491 if(!fClusters || !fClusters->GetEntriesFast()){
492 AliInfo("No TRD clusters");
493 return 0;
494 }
41702fec 495 AliTRDtrackV1 track;
496 for (Int_t itrack = 0; itrack < event->GetNumberOfTracks(); itrack++) {
497 AliESDtrack *seed = event->GetTrack(itrack);
050875b0 498 ULong_t status = seed->GetStatus();
88987d18 499
050875b0 500 new(&track) AliTRDtrackV1(*seed);
41702fec 501 if (track.GetX() < 270.0) {
502 seed->UpdateTrackParams(&track, AliESDtrack::kTRDbackup);
503 continue;
504 }
88987d18 505
506 // reject tracks which failed propagation in the TRD or
507 // are produced by the TRD stand alone tracker
508 if(!(status & AliESDtrack::kTRDout)) continue;
509 if(!(status & AliESDtrack::kTRDin)) continue;
510 nseed++;
41702fec 511
512 track.ResetCovariance(50.0);
513
514 // do the propagation and processing
515 Bool_t kUPDATE = kFALSE;
88987d18 516 Double_t xTPC = 250.0;
41702fec 517 if(FollowProlongation(track)){
e3cf3d02 518 // Update the friend track
2d73d21c 519 if (fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 0){
4d6aee34 520 TObject *o = NULL; Int_t ic = 0;
521 AliTRDtrackV1 *calibTrack = NULL;
e3cf3d02 522 while((o = seed->GetCalibObject(ic++))){
523 if(!(calibTrack = dynamic_cast<AliTRDtrackV1*>(o))) continue;
a310e49b 524 calibTrack->SetTrackOut(&track);
e3cf3d02 525 }
41702fec 526 }
a310e49b 527
528 // Prolongate to TPC
88987d18 529 if (PropagateToX(track, xTPC, AliTRDReconstructor::GetMaxStep())) { // -with update
a310e49b 530 seed->UpdateTrackParams(&track, AliESDtrack::kTRDrefit);
531 found++;
532 kUPDATE = kTRUE;
533 }
e3cf3d02 534 }
41702fec 535
536 // Prolongate to TPC without update
537 if(!kUPDATE) {
538 AliTRDtrackV1 tt(*seed);
88987d18 539 if (PropagateToX(tt, xTPC, AliTRDReconstructor::GetMaxStep())) seed->UpdateTrackParams(&tt, AliESDtrack::kTRDbackup);
41702fec 540 }
541 }
980d5a2a 542 AliInfo(Form("Number of seeds: TRDout[%d]", nseed));
543 AliInfo(Form("Number of tracks: TRDrefit[%d]", found));
41702fec 544
545 return 0;
0906e73e 546}
547
0906e73e 548//____________________________________________________________________
549Int_t AliTRDtrackerV1::FollowProlongation(AliTRDtrackV1 &t)
550{
41702fec 551 // Extrapolates the TRD track in the TPC direction.
552 //
553 // Parameters
554 // t : the TRD track which has to be extrapolated
555 //
556 // Output
557 // number of clusters attached to the track
558 //
559 // Detailed description
560 //
561 // Starting from current radial position of track <t> this function
562 // extrapolates the track through the 6 TRD layers. The following steps
563 // are being performed for each plane:
564 // 1. prepare track:
565 // a. get plane limits in the local x direction
566 // b. check crossing sectors
567 // c. check track inclination
568 // 2. search tracklet in the tracker list (see GetTracklet() for details)
569 // 3. evaluate material budget using the geo manager
570 // 4. propagate and update track using the tracklet information.
571 //
572 // Debug level 2
573 //
574
575 Int_t nClustersExpected = 0;
e3cf3d02 576 for (Int_t iplane = kNPlanes; iplane--;) {
17896e82 577 Int_t index(-1);
41702fec 578 AliTRDseedV1 *tracklet = GetTracklet(&t, iplane, index);
17896e82 579 AliDebug(2, Form("Tracklet[%p] ly[%d] idx[%d]", (void*)tracklet, iplane, index));
41702fec 580 if(!tracklet) continue;
980d5a2a 581 if(!tracklet->IsOK()){
582 AliDebug(1, Form("Tracklet Det[%d] !OK", tracklet->GetDetector()));
583 continue;
584 }
e3cf3d02 585 Double_t x = tracklet->GetX();//GetX0();
41702fec 586 // reject tracklets which are not considered for inward refit
88987d18 587 if(x > t.GetX()+AliTRDReconstructor::GetMaxStep()) continue;
588
41702fec 589 // append tracklet to track
590 t.SetTracklet(tracklet, index);
591
952051c5 592 if (x < (t.GetX()-AliTRDReconstructor::GetMaxStep()) && !PropagateToX(t, x+AliTRDReconstructor::GetMaxStep(), AliTRDReconstructor::GetMaxStep())) break;
41702fec 593 if (!AdjustSector(&t)) break;
594
595 // Start global position
596 Double_t xyz0[3];
597 t.GetXYZ(xyz0);
598
599 // End global position
600 Double_t alpha = t.GetAlpha(), y, z;
601 if (!t.GetProlongation(x,y,z)) break;
602 Double_t xyz1[3];
603 xyz1[0] = x * TMath::Cos(alpha) - y * TMath::Sin(alpha);
604 xyz1[1] = x * TMath::Sin(alpha) + y * TMath::Cos(alpha);
605 xyz1[2] = z;
606
51a23065 607 Double_t length = TMath::Sqrt(
608 (xyz0[0]-xyz1[0])*(xyz0[0]-xyz1[0]) +
609 (xyz0[1]-xyz1[1])*(xyz0[1]-xyz1[1]) +
610 (xyz0[2]-xyz1[2])*(xyz0[2]-xyz1[2])
611 );
612 if(length>0.){
613 // Get material budget
614 Double_t param[7];
615 if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param)<=0.) break;
616 Double_t xrho= param[0]*param[4];
617 Double_t xx0 = param[1]; // Get mean propagation parameters
618
619 // Propagate and update
620 t.PropagateTo(x, xx0, xrho);
621 if (!AdjustSector(&t)) break;
622 }
e3cf3d02 623
b72f4eaf 624 Double_t cov[3]; tracklet->GetCovAt(x, cov);
625 Double_t p[2] = { tracklet->GetY(), tracklet->GetZ()};
626 Double_t chi2 = ((AliExternalTrackParam)t).GetPredictedChi2(p, cov);
ef867f55 627 if (chi2 < 1e+10 && ((AliExternalTrackParam&)t).Update(p, cov)){
628 // Register info to track
629 t.SetNumberOfClusters();
630 t.UpdateChi2(chi2);
41702fec 631 nClustersExpected += tracklet->GetN();
632 }
633 }
634
9e85cb05 635 if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 1){
41702fec 636 Int_t index;
51a23065 637 for(int iplane=0; iplane<AliTRDgeometry::kNlayer; iplane++){
41702fec 638 AliTRDseedV1 *tracklet = GetTracklet(&t, iplane, index);
639 if(!tracklet) continue;
640 t.SetTracklet(tracklet, index);
641 }
642
a2fbb6ec 643 if(fkReconstructor->IsDebugStreaming()){
644 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
645 TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
646 AliTRDtrackV1 track(t);
647 track.SetOwner();
648 cstreamer << "FollowProlongation"
649 << "EventNumber=" << eventNumber
650 << "ncl=" << nClustersExpected
651 << "track.=" << &track
652 << "\n";
653 }
41702fec 654 }
41702fec 655 return nClustersExpected;
0906e73e 656
657}
658
659//_____________________________________________________________________________
660Int_t AliTRDtrackerV1::FollowBackProlongation(AliTRDtrackV1 &t)
661{
afa21247 662// Extrapolates/Build the TRD track in the TOF direction.
663//
664// Parameters
665// t : the TRD track which has to be extrapolated
666//
667// Output
668// number of clusters attached to the track
669//
670// Starting from current radial position of track <t> this function
671// extrapolates the track through the 6 TRD layers. The following steps
672// are being performed for each plane:
673// 1. Propagate track to the entrance of the next chamber:
674// - get chamber limits in the radial direction
675// - check crossing sectors
676// - check track inclination
677// - check track prolongation against boundary conditions (see exclusion boundaries on AliTRDgeometry::IsOnBoundary())
678// 2. Build tracklet (see AliTRDseed::AttachClusters() for details) for this layer if needed. If only
679// Kalman filter is needed and tracklets are already linked to the track this step is skipped.
680// 3. Fit tracklet using the information from the Kalman filter.
681// 4. Propagate and update track at reference radial position of the tracklet.
682// 5. Register tracklet with the tracker and track; update pulls monitoring.
683//
684// Observation
2a3191bb 685// 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:
686// - AliTRDtrackV1::kProlongation : track prolongation failed
687// - AliTRDtrackV1::kPropagation : track prolongation failed
688// - AliTRDtrackV1::kAdjustSector : failed during sector crossing
689// - AliTRDtrackV1::kSnp : too large bending
690// - AliTRDtrackV1::kTrackletInit : fail to initialize tracklet
691// - AliTRDtrackV1::kUpdate : fail to attach clusters or fit the tracklet
692// - AliTRDtrackV1::kUnknown : anything which is not covered before
afa21247 693// 2. By default the status of the track before first TRD update is saved.
694//
695// Debug level 2
696//
697// Author
698// Alexandru Bercuci <A.Bercuci@gsi.de>
699//
41702fec 700
eb2b4f91 701 Int_t n = 0;
702 Double_t driftLength = .5*AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick();
4d6aee34 703 AliTRDtrackingChamber *chamber = NULL;
41702fec 704
9e85cb05 705 Int_t debugLevel = fkReconstructor->IsDebugStreaming() ? fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) : 0;
7c3eecb8 706 TTreeSRedirector *cstreamer = fkReconstructor->IsDebugStreaming() ? fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker) : 0x0;
707
36574ea4 708 Bool_t kStoreIn(kTRUE), // toggel store track params. at TRD entry
68f9b6bd 709 kStandAlone(kFALSE), // toggle tracker awarness of stand alone seeding
710 kUseTRD(fkRecoParam->IsOverPtThreshold(t.Pt()));// use TRD measurment to update Kalman
711
712 Int_t startLayer(0);
4d6aee34 713 AliTRDseedV1 tracklet, *ptrTracklet = NULL;
68f9b6bd 714 // Special case for stand alone tracking
715 // - store all tracklets found by seeding
716 // - start propagation from first tracklet found
181d2c97 717 AliTRDseedV1 *tracklets[kNPlanes];
718 memset(tracklets, 0, sizeof(AliTRDseedV1 *) * kNPlanes);
68f9b6bd 719 for(Int_t ip(kNPlanes); ip--;){
720 if(!(tracklets[ip] = t.GetTracklet(ip))) continue;
181d2c97 721 t.UnsetTracklet(ip);
68f9b6bd 722 if(tracklets[ip]->IsOK()) startLayer=ip;
723 kStandAlone = kTRUE;
0b559d95 724 kUseTRD = kTRUE;
181d2c97 725 }
68f9b6bd 726 AliDebug(4, Form("SA[%c] Start[%d]\n"
727 " [0]idx[%d] traklet[%p]\n"
728 " [1]idx[%d] traklet[%p]\n"
729 " [2]idx[%d] traklet[%p]\n"
730 " [3]idx[%d] traklet[%p]\n"
731 " [4]idx[%d] traklet[%p]\n"
732 " [5]idx[%d] traklet[%p]"
733 , kStandAlone?'y':'n', startLayer
734 , t.GetTrackletIndex(0), (void*)tracklets[0]
735 , t.GetTrackletIndex(1), (void*)tracklets[1]
736 , t.GetTrackletIndex(2), (void*)tracklets[2]
737 , t.GetTrackletIndex(3), (void*)tracklets[3]
738 , t.GetTrackletIndex(4), (void*)tracklets[4]
739 , t.GetTrackletIndex(5), (void*)tracklets[5]));
e3cf3d02 740
053767a4 741 // Loop through the TRD layers
4d6aee34 742 TGeoHMatrix *matrix = NULL;
3e860707 743 Double_t x(0.), y(0.), z(0.);
68f9b6bd 744 for (Int_t ily=startLayer, sm=-1, stk=-1, det=-1; ily < AliTRDgeometry::kNlayer; ily++) {
1bd708e3 745 AliDebug(2, Form("Propagate to x[%d] = %7.2f", ily, fR[ily]));
746
eb2b4f91 747 // rough estimate of the entry point
748 if (!t.GetProlongation(fR[ily], y, z)){
88987d18 749 n=-1;
34b5e42d 750 t.SetErrStat(AliTRDtrackV1::kProlongation);
1bd708e3 751 AliDebug(4, Form("Failed Rough Prolongation to ly[%d] x[%7.2f] y[%7.2f] z[%7.2f]", ily, fR[ily], y, z));
eb2b4f91 752 break;
753 }
41702fec 754
eb2b4f91 755 // find sector / stack / detector
756 sm = t.GetSector();
757 // TODO cross check with y value !
758 stk = fGeom->GetStack(z, ily);
759 det = stk>=0 ? AliTRDgeometry::GetDetector(ily, stk, sm) : -1;
4d6aee34 760 matrix = det>=0 ? fGeom->GetClusterMatrix(det) : NULL;
eb2b4f91 761
762 // check if supermodule/chamber is installed
763 if( !fGeom->GetSMstatus(sm) ||
764 stk<0. ||
765 fGeom->IsHole(ily, stk, sm) ||
766 !matrix ){
1bd708e3 767 AliDebug(4, Form("Missing Geometry ly[%d]. Guess radial position", ily));
eb2b4f91 768 // propagate to the default radial position
952051c5 769 if(fR[ily] > (AliTRDReconstructor::GetMaxStep() + t.GetX()) && !PropagateToX(t, fR[ily], AliTRDReconstructor::GetMaxStep())){
88987d18 770 n=-1;
34b5e42d 771 t.SetErrStat(AliTRDtrackV1::kPropagation);
1bd708e3 772 AliDebug(4, "Failed Propagation [Missing Geometry]");
41702fec 773 break;
774 }
eb2b4f91 775 if(!AdjustSector(&t)){
88987d18 776 n=-1;
34b5e42d 777 t.SetErrStat(AliTRDtrackV1::kAdjustSector);
1bd708e3 778 AliDebug(4, "Failed Adjust Sector [Missing Geometry]");
eb2b4f91 779 break;
780 }
952051c5 781 if(TMath::Abs(t.GetSnp()) > AliTRDReconstructor::GetMaxSnp()){
88987d18 782 n=-1;
34b5e42d 783 t.SetErrStat(AliTRDtrackV1::kSnp);
1bd708e3 784 AliDebug(4, "Failed Max Snp [Missing Geometry]");
eb2b4f91 785 break;
786 }
34b5e42d 787 t.SetErrStat(AliTRDtrackV1::kGeometry, ily);
41702fec 788 continue;
789 }
e3cf3d02 790
eb2b4f91 791 // retrieve rotation matrix for the current chamber
792 Double_t loc[] = {AliTRDgeometry::AnodePos()- driftLength, 0., 0.};
793 Double_t glb[] = {0., 0., 0.};
794 matrix->LocalToMaster(loc, glb);
88987d18 795 AliDebug(3, Form("Propagate to det[%3d] x_anode[%7.2f] (%f %f)", det, glb[0]+driftLength, glb[1], glb[2]));
eb2b4f91 796
797 // Propagate to the radial distance of the current layer
952051c5 798 x = glb[0] - AliTRDReconstructor::GetMaxStep();
799 if(x > (AliTRDReconstructor::GetMaxStep() + t.GetX()) && !PropagateToX(t, x, AliTRDReconstructor::GetMaxStep())){
88987d18 800 n=-1;
34b5e42d 801 t.SetErrStat(AliTRDtrackV1::kPropagation);
88987d18 802 AliDebug(4, Form("Failed Initial Propagation to x[%7.2f]", x));
eb2b4f91 803 break;
804 }
805 if(!AdjustSector(&t)){
88987d18 806 n=-1;
34b5e42d 807 t.SetErrStat(AliTRDtrackV1::kAdjustSector);
1bd708e3 808 AliDebug(4, "Failed Adjust Sector Start");
eb2b4f91 809 break;
810 }
952051c5 811 if(TMath::Abs(t.GetSnp()) > AliTRDReconstructor::GetMaxSnp()) {
88987d18 812 n=-1;
34b5e42d 813 t.SetErrStat(AliTRDtrackV1::kSnp);
952051c5 814 AliDebug(4, Form("Failed Max Snp[%f] MaxSnp[%f]", t.GetSnp(), AliTRDReconstructor::GetMaxSnp()));
eb2b4f91 815 break;
816 }
4d6aee34 817 Bool_t doRecalculate = kFALSE;
eb2b4f91 818 if(sm != t.GetSector()){
819 sm = t.GetSector();
4d6aee34 820 doRecalculate = kTRUE;
eb2b4f91 821 }
822 if(stk != fGeom->GetStack(z, ily)){
823 stk = fGeom->GetStack(z, ily);
4d6aee34 824 doRecalculate = kTRUE;
eb2b4f91 825 }
4d6aee34 826 if(doRecalculate){
eb2b4f91 827 det = AliTRDgeometry::GetDetector(ily, stk, sm);
828 if(!(matrix = fGeom->GetClusterMatrix(det))){
34b5e42d 829 t.SetErrStat(AliTRDtrackV1::kGeometry, ily);
1bd708e3 830 AliDebug(4, Form("Failed Geometry Matrix ly[%d]", ily));
eb2b4f91 831 continue;
832 }
833 matrix->LocalToMaster(loc, glb);
952051c5 834 x = glb[0] - AliTRDReconstructor::GetMaxStep();
eb2b4f91 835 }
836
837 // check if track is well inside fiducial volume
952051c5 838 if (!t.GetProlongation(x+AliTRDReconstructor::GetMaxStep(), y, z)) {
88987d18 839 n=-1;
34b5e42d 840 t.SetErrStat(AliTRDtrackV1::kProlongation);
952051c5 841 AliDebug(4, Form("Failed Prolongation to x[%7.2f] y[%7.2f] z[%7.2f]", x+AliTRDReconstructor::GetMaxStep(), y, z));
eb2b4f91 842 break;
843 }
844 if(fGeom->IsOnBoundary(det, y, z, .5)){
34b5e42d 845 t.SetErrStat(AliTRDtrackV1::kBoundary, ily);
1bd708e3 846 AliDebug(4, "Failed Track on Boundary");
eb2b4f91 847 continue;
848 }
b1957d3c 849
eb2b4f91 850 ptrTracklet = tracklets[ily];
851 if(!ptrTracklet){ // BUILD TRACKLET
1bd708e3 852 AliDebug(3, Form("Building tracklet det[%d]", det));
eb2b4f91 853 // check data in supermodule
854 if(!fTrSec[sm].GetNChambers()){
34b5e42d 855 t.SetErrStat(AliTRDtrackV1::kNoClusters, ily);
88987d18 856 AliDebug(4, "Failed NoClusters");
eb2b4f91 857 continue;
858 }
859 if(fTrSec[sm].GetX(ily) < 1.){
34b5e42d 860 t.SetErrStat(AliTRDtrackV1::kNoClusters, ily);
88987d18 861 AliDebug(4, "Failed NoX");
eb2b4f91 862 continue;
863 }
864
865 // check data in chamber
866 if(!(chamber = fTrSec[sm].GetChamber(stk, ily))){
34b5e42d 867 t.SetErrStat(AliTRDtrackV1::kNoClusters, ily);
88987d18 868 AliDebug(4, "Failed No Detector");
eb2b4f91 869 continue;
870 }
9e85cb05 871 if(chamber->GetNClusters() < fgNTimeBins*fkRecoParam ->GetFindableClusters()){
34b5e42d 872 t.SetErrStat(AliTRDtrackV1::kNoClusters, ily);
88987d18 873 AliDebug(4, "Failed Not Enough Clusters in Detector");
eb2b4f91 874 continue;
875 }
876 // build tracklet
4d8f1bd9 877 tracklet.~AliTRDseedV1();
eb2b4f91 878 ptrTracklet = new(&tracklet) AliTRDseedV1(det);
4d6aee34 879 ptrTracklet->SetReconstructor(fkReconstructor);
eb2b4f91 880 ptrTracklet->SetKink(t.IsKink());
2eb10c34 881 ptrTracklet->SetPrimary(t.IsPrimary());
eb2b4f91 882 ptrTracklet->SetPadPlane(fGeom->GetPadPlane(ily, stk));
883 ptrTracklet->SetX0(glb[0]+driftLength);
4d8f1bd9 884 if(!ptrTracklet->Init(&t)){
88987d18 885 n=-1;
34b5e42d 886 t.SetErrStat(AliTRDtrackV1::kTrackletInit);
1bd708e3 887 AliDebug(4, "Failed Tracklet Init");
eb2b4f91 888 break;
889 }
803dc399 890 // Select attachment base on track to B field sign not only track charge which is buggy
891 // mark kFALSE same sign tracks and kTRUE opposite sign tracks
892 // A.Bercuci 3.11.2011
893 Float_t prod(t.GetBz()*t.Charge());
894 if(!ptrTracklet->AttachClusters(chamber, kTRUE, prod<0.?kTRUE:kFALSE, fEventInFile)){
34b5e42d 895 t.SetErrStat(AliTRDtrackV1::kNoAttach, ily);
7c3eecb8 896 if(debugLevel>3){
897 AliTRDseedV1 trackletCp(*ptrTracklet);
898 UChar_t status(t.GetStatusTRD(ily));
9dcc64cc 899 (*cstreamer) << "FollowBackProlongation4"
7c3eecb8 900 <<"status=" << status
901 <<"tracklet.=" << &trackletCp
902 << "\n";
903 }
1bd708e3 904 AliDebug(4, "Failed Attach Clusters");
eb2b4f91 905 continue;
906 }
88987d18 907 AliDebug(3, Form("Number of Clusters in Tracklet: %d", ptrTracklet->GetN()));
908 if(ptrTracklet->GetN() < fgNTimeBins*fkRecoParam->GetFindableClusters()){
34b5e42d 909 t.SetErrStat(AliTRDtrackV1::kNoClustersTracklet, ily);
7c3eecb8 910 if(debugLevel>3){
911 AliTRDseedV1 trackletCp(*ptrTracklet);
912 UChar_t status(t.GetStatusTRD(ily));
9dcc64cc 913 (*cstreamer) << "FollowBackProlongation4"
7c3eecb8 914 <<"status=" << status
915 <<"tracklet.=" << &trackletCp
916 << "\n";
917 }
88987d18 918 AliDebug(4, "Failed N Clusters Attached");
eb2b4f91 919 continue;
920 }
921 ptrTracklet->UpdateUsed();
0217fcd0 922 } else AliDebug(2, Form("Use external tracklet ly[%d]", ily));
eb2b4f91 923 // propagate track to the radial position of the tracklet
68f9b6bd 924
2eb10c34 925 // fit tracklet
926 // tilt correction options
927 // 0 : no correction
928 // 2 : pseudo tilt correction
9dcc64cc 929 if(!ptrTracklet->FitRobust(t.Charge()>0?kTRUE:kFALSE)){
34b5e42d 930 t.SetErrStat(AliTRDtrackV1::kNoFit, ily);
1bd708e3 931 AliDebug(4, "Failed Tracklet Fit");
eb2b4f91 932 continue;
933 }
934 x = ptrTracklet->GetX(); //GetX0();
952051c5 935 if(x > (AliTRDReconstructor::GetMaxStep() + t.GetX()) && !PropagateToX(t, x, AliTRDReconstructor::GetMaxStep())) {
88987d18 936 n=-1;
34b5e42d 937 t.SetErrStat(AliTRDtrackV1::kPropagation);
1bd708e3 938 AliDebug(4, Form("Failed Propagation to Tracklet x[%7.2f]", x));
eb2b4f91 939 break;
940 }
941 if(!AdjustSector(&t)) {
88987d18 942 n=-1;
34b5e42d 943 t.SetErrStat(AliTRDtrackV1::kAdjustSector);
1bd708e3 944 AliDebug(4, "Failed Adjust Sector");
eb2b4f91 945 break;
41702fec 946 }
952051c5 947 if(TMath::Abs(t.GetSnp()) > AliTRDReconstructor::GetMaxSnp()) {
88987d18 948 n=-1;
34b5e42d 949 t.SetErrStat(AliTRDtrackV1::kSnp);
952051c5 950 AliDebug(4, Form("Failed Max Snp[%f] MaxSnp[%f]", t.GetSnp(), AliTRDReconstructor::GetMaxSnp()));
eb2b4f91 951 break;
952 }
b72f4eaf 953 Double_t cov[3]; ptrTracklet->GetCovAt(x, cov);
954 Double_t p[2] = { ptrTracklet->GetY(), ptrTracklet->GetZ()};
955 Double_t chi2 = ((AliExternalTrackParam)t).GetPredictedChi2(p, cov);
6e39bde4 956 // update Kalman with the TRD measurement
b72f4eaf 957 if(chi2>1e+10){ // TODO
34b5e42d 958 t.SetErrStat(AliTRDtrackV1::kChi2, ily);
7c3eecb8 959 if(debugLevel > 2){
960 UChar_t status(t.GetStatusTRD());
961 AliTRDseedV1 trackletCp(*ptrTracklet);
962 AliTRDtrackV1 trackCp(t);
963 trackCp.SetOwner();
9dcc64cc 964 (*cstreamer) << "FollowBackProlongation3"
7c3eecb8 965 << "status=" << status
966 << "tracklet.=" << &trackletCp
967 << "track.=" << &trackCp
968 << "\n";
969 }
1bd708e3 970 AliDebug(4, Form("Failed Chi2[%f]", chi2));
eb2b4f91 971 continue;
972 }
88987d18 973 // mark track as entering the FIDUCIAL volume of TRD
974 if(kStoreIn){
975 t.SetTrackIn();
976 kStoreIn = kFALSE;
977 }
ef867f55 978 if(kUseTRD){
979 if(!((AliExternalTrackParam&)t).Update(p, cov)) {
88987d18 980 n=-1;
34b5e42d 981 t.SetErrStat(AliTRDtrackV1::kUpdate);
ef867f55 982 if(debugLevel > 2){
983 UChar_t status(t.GetStatusTRD());
984 AliTRDseedV1 trackletCp(*ptrTracklet);
985 AliTRDtrackV1 trackCp(t);
986 trackCp.SetOwner();
9dcc64cc 987 (*cstreamer) << "FollowBackProlongation3"
ef867f55 988 << "status=" << status
989 << "tracklet.=" << &trackletCp
990 << "track.=" << &trackCp
991 << "\n";
992 }
993 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]));
994 break;
7c3eecb8 995 }
eb2b4f91 996 }
68f9b6bd 997 if(!kStandAlone) ptrTracklet->UseClusters();
b72f4eaf 998 // fill residuals ?!
999 AliTracker::FillResiduals(&t, p, cov, ptrTracklet->GetVolumeId());
1000
eb2b4f91 1001
4d8f1bd9 1002 // register tracklet with the tracker and track
803dc399 1003 // Save inside the tracklet the track parameters BEFORE track update.
1004 // Commented out their overwriting AFTER track update
1005 // A.Bercuci 3.11.2011
1006 //ptrTracklet->Update(&t);
eb2b4f91 1007 ptrTracklet = SetTracklet(ptrTracklet);
17896e82 1008 Int_t index(fTracklets->GetEntriesFast()-1);
1009 t.SetTracklet(ptrTracklet, index);
ef867f55 1010 // Register info to track
1011 t.SetNumberOfClusters();
1012 t.UpdateChi2(chi2);
1013
eb2b4f91 1014 n += ptrTracklet->GetN();
17896e82 1015 AliDebug(2, Form("Setting Tracklet[%d] @ Idx[%d]", ily, index));
eb2b4f91 1016
41702fec 1017 // Reset material budget if 2 consecutive gold
eb2b4f91 1018// if(ilayer>0 && t.GetTracklet(ilayer-1) && ptrTracklet->GetN() + t.GetTracklet(ilayer-1)->GetN() > 20) t.SetBudget(2, 0.);
41702fec 1019
1020 // Make backup of the track until is gold
b453ef55 1021 Int_t failed(0);
68f9b6bd 1022 if(!kStandAlone && (failed = t.MakeBackupTrack())) AliDebug(2, Form("Failed backup on cut[%d]", failed));
9e85cb05 1023
053767a4 1024 } // end layers loop
eb2b4f91 1025 //printf("clusters[%d] chi2[%f] x[%f] status[%d ", n, t.GetChi2(), t.GetX(), t.GetStatusTRD());
1026 //for(int i=0; i<6; i++) printf("%d ", t.GetStatusTRD(i)); printf("]\n");
41702fec 1027
9dcc64cc 1028 if(n && debugLevel > 1){
1029 //Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
eb2b4f91 1030 AliTRDtrackV1 track(t);
1031 track.SetOwner();
9dcc64cc 1032 (*cstreamer) << "FollowBackProlongation2"
1033 << "EventNumber=" << fEventInFile
eb2b4f91 1034 << "track.=" << &track
41702fec 1035 << "\n";
1036 }
1037
eb2b4f91 1038 return n;
0906e73e 1039}
1040
eb38ed55 1041//_________________________________________________________________________
4d6aee34 1042Float_t AliTRDtrackerV1::FitRieman(AliTRDseedV1 *tracklets, Double_t *chi2, Int_t *const planes){
41702fec 1043 //
1044 // Fits a Riemann-circle to the given points without tilting pad correction.
1045 // The fit is performed using an instance of the class AliRieman (equations
1046 // and transformations see documentation of this class)
1047 // Afterwards all the tracklets are Updated
1048 //
1049 // Parameters: - Array of tracklets (AliTRDseedV1)
1050 // - Storage for the chi2 values (beginning with direction z)
1051 // - Seeding configuration
1052 // Output: - The curvature
1053 //
1054 AliRieman *fitter = AliTRDtrackerV1::GetRiemanFitter();
1055 fitter->Reset();
1056 Int_t allplanes[] = {0, 1, 2, 3, 4, 5};
1057 Int_t *ppl = &allplanes[0];
1058 Int_t maxLayers = 6;
1059 if(planes){
1060 maxLayers = 4;
1061 ppl = planes;
1062 }
1063 for(Int_t il = 0; il < maxLayers; il++){
1064 if(!tracklets[ppl[il]].IsOK()) continue;
e3cf3d02 1065 fitter->AddPoint(tracklets[ppl[il]].GetX0(), tracklets[ppl[il]].GetYfit(0), tracklets[ppl[il]].GetZfit(0),1,10);
41702fec 1066 }
1067 fitter->Update();
1068 // Set the reference position of the fit and calculate the chi2 values
1069 memset(chi2, 0, sizeof(Double_t) * 2);
1070 for(Int_t il = 0; il < maxLayers; il++){
1071 // Reference positions
1072 tracklets[ppl[il]].Init(fitter);
1073
1074 // chi2
1075 if((!tracklets[ppl[il]].IsOK()) && (!planes)) continue;
1076 chi2[0] += tracklets[ppl[il]].GetChi2Y();
1077 chi2[1] += tracklets[ppl[il]].GetChi2Z();
1078 }
1079 return fitter->GetC();
eb38ed55 1080}
1081
1082//_________________________________________________________________________
1083void AliTRDtrackerV1::FitRieman(AliTRDcluster **seedcl, Double_t chi2[2])
1084{
41702fec 1085 //
1086 // Performs a Riemann helix fit using the seedclusters as spacepoints
1087 // Afterwards the chi2 values are calculated and the seeds are updated
1088 //
1089 // Parameters: - The four seedclusters
1090 // - The tracklet array (AliTRDseedV1)
1091 // - The seeding configuration
1092 // - Chi2 array
1093 //
1094 // debug level 2
1095 //
1096 AliRieman *fitter = AliTRDtrackerV1::GetRiemanFitter();
1097 fitter->Reset();
a3743898 1098 for(Int_t i = 0; i < 4; i++){
a3743898 1099 fitter->AddPoint(seedcl[i]->GetX(), seedcl[i]->GetY(), seedcl[i]->GetZ(), 1., 10.);
1100 }
41702fec 1101 fitter->Update();
1102
1103
1104 // Update the seed and calculated the chi2 value
1105 chi2[0] = 0; chi2[1] = 0;
1106 for(Int_t ipl = 0; ipl < kNSeedPlanes; ipl++){
1107 // chi2
1108 chi2[0] += (seedcl[ipl]->GetZ() - fitter->GetZat(seedcl[ipl]->GetX())) * (seedcl[ipl]->GetZ() - fitter->GetZat(seedcl[ipl]->GetX()));
1109 chi2[1] += (seedcl[ipl]->GetY() - fitter->GetYat(seedcl[ipl]->GetX())) * (seedcl[ipl]->GetY() - fitter->GetYat(seedcl[ipl]->GetX()));
1110 }
eb38ed55 1111}
1112
1113
1114//_________________________________________________________________________
1115Float_t AliTRDtrackerV1::FitTiltedRiemanConstraint(AliTRDseedV1 *tracklets, Double_t zVertex)
1116{
41702fec 1117 //
1118 // Fits a helix to the clusters. Pad tilting is considered. As constraint it is
1119 // assumed that the vertex position is set to 0.
1120 // This method is very usefull for high-pt particles
1121 // Basis for the fit: (x - x0)^2 + (y - y0)^2 - R^2 = 0
1122 // x0, y0: Center of the circle
1123 // Measured y-position: ymeas = y - tan(phiT)(zc - zt)
1124 // zc: center of the pad row
1125 // Equation which has to be fitted (after transformation):
1126 // a + b * u + e * v + 2*(ymeas + tan(phiT)(z - zVertex))*t = 0
1127 // Transformation:
1128 // t = 1/(x^2 + y^2)
1129 // u = 2 * x * t
1130 // v = 2 * x * tan(phiT) * t
1131 // Parameters in the equation:
1132 // a = -1/y0, b = x0/y0, e = dz/dx
1133 //
1134 // The Curvature is calculated by the following equation:
1135 // - curv = a/Sqrt(b^2 + 1) = 1/R
1136 // Parameters: - the 6 tracklets
1137 // - the Vertex constraint
1138 // Output: - the Chi2 value of the track
1139 //
1140 // debug level 5
1141 //
1142
1143 TLinearFitter *fitter = GetTiltedRiemanFitterConstraint();
1144 fitter->StoreData(kTRUE);
1145 fitter->ClearPoints();
4d6aee34 1146 AliTRDcluster *cl = NULL;
41702fec 1147
1148 Float_t x, y, z, w, t, error, tilt;
1149 Double_t uvt[2];
1150 Int_t nPoints = 0;
053767a4 1151 for(Int_t ilr = 0; ilr < AliTRDgeometry::kNlayer; ilr++){
1152 if(!tracklets[ilr].IsOK()) continue;
8d2bec9e 1153 for(Int_t itb = 0; itb < AliTRDseedV1::kNclusters; itb++){
053767a4 1154 if(!tracklets[ilr].IsUsable(itb)) continue;
e7542a7e 1155 if(!(cl = tracklets[ilr].GetClusters(itb))) continue;
1742f24c 1156 if(!cl->IsInChamber()) continue;
41702fec 1157 x = cl->GetX();
1158 y = cl->GetY();
1159 z = cl->GetZ();
053767a4 1160 tilt = tracklets[ilr].GetTilt();
41702fec 1161 // Transformation
1162 t = 1./(x * x + y * y);
1163 uvt[0] = 2. * x * t;
1164 uvt[1] = 2. * x * t * tilt ;
1165 w = 2. * (y + tilt * (z - zVertex)) * t;
78b7d24c 1166 error = 2. * TMath::Sqrt(cl->GetSigmaY2()+tilt*tilt*cl->GetSigmaZ2()) * t;
41702fec 1167 fitter->AddPoint(uvt, w, error);
1168 nPoints++;
1169 }
1170 }
e17f4785 1171 fitter->Eval();
41702fec 1172
1173 // Calculate curvature
1174 Double_t a = fitter->GetParameter(0);
1175 Double_t b = fitter->GetParameter(1);
1176 Double_t curvature = a/TMath::Sqrt(b*b + 1);
1177
ce42378b 1178 Float_t chi2track = 0.0;
1179 if (nPoints > 0) {
1180 chi2track = fitter->GetChisquare()/Double_t(nPoints);
1181 }
41702fec 1182 for(Int_t ip = 0; ip < AliTRDtrackerV1::kNPlanes; ip++)
68f9b6bd 1183 tracklets[ip].SetC(curvature, 1);
1184
1185 if(AliLog::GetDebugLevel("TRD", "AliTRDtrackerV1")>3) printf("D-AliTRDtrackerV1::FitTiltedRiemanConstraint: Chi2[%f] C[%5.2e] pt[%8.3f]\n", chi2track, curvature, GetBz()*kB2C/curvature);
41702fec 1186
a2fbb6ec 1187/* if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker()) >= 5){
41702fec 1188 //Linear Model on z-direction
1189 Double_t xref = CalculateReferenceX(tracklets); // Relative to the middle of the stack
1190 Double_t slope = fitter->GetParameter(2);
1191 Double_t zref = slope * xref;
1192 Float_t chi2Z = CalculateChi2Z(tracklets, zref, slope, xref);
1193 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
1194 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
4d6aee34 1195 TTreeSRedirector &treeStreamer = *fkReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
41702fec 1196 treeStreamer << "FitTiltedRiemanConstraint"
1197 << "EventNumber=" << eventNumber
1198 << "CandidateNumber=" << candidateNumber
1199 << "Curvature=" << curvature
1200 << "Chi2Track=" << chi2track
1201 << "Chi2Z=" << chi2Z
1202 << "zref=" << zref
1203 << "\n";
3a039a31 1204 }*/
41702fec 1205 return chi2track;
eb38ed55 1206}
1207
1208//_________________________________________________________________________
1209Float_t AliTRDtrackerV1::FitTiltedRieman(AliTRDseedV1 *tracklets, Bool_t sigError)
1210{
41702fec 1211 //
1212 // Performs a Riemann fit taking tilting pad correction into account
1213 // The equation of a Riemann circle, where the y position is substituted by the
1214 // measured y-position taking pad tilting into account, has to be transformed
1215 // into a 4-dimensional hyperplane equation
1216 // Riemann circle: (x-x0)^2 + (y-y0)^2 -R^2 = 0
1217 // Measured y-Position: ymeas = y - tan(phiT)(zc - zt)
1218 // zc: center of the pad row
1219 // zt: z-position of the track
1220 // The z-position of the track is assumed to be linear dependent on the x-position
1221 // Transformed equation: a + b * u + c * t + d * v + e * w - 2 * (ymeas + tan(phiT) * zc) * t = 0
1222 // Transformation: u = 2 * x * t
1223 // v = 2 * tan(phiT) * t
1224 // w = 2 * tan(phiT) * (x - xref) * t
1225 // t = 1 / (x^2 + ymeas^2)
1226 // Parameters: a = -1/y0
1227 // b = x0/y0
1228 // c = (R^2 -x0^2 - y0^2)/y0
1229 // d = offset
1230 // e = dz/dx
1231 // If the offset respectively the slope in z-position is impossible, the parameters are fixed using
1232 // results from the simple riemann fit. Afterwards the fit is redone.
1233 // The curvature is calculated according to the formula:
1234 // curv = a/(1 + b^2 + c*a) = 1/R
1235 //
1236 // Paramters: - Array of tracklets (connected to the track candidate)
1237 // - Flag selecting the error definition
1238 // Output: - Chi2 values of the track (in Parameter list)
1239 //
1240 TLinearFitter *fitter = GetTiltedRiemanFitter();
1241 fitter->StoreData(kTRUE);
1242 fitter->ClearPoints();
1243 AliTRDLeastSquare zfitter;
4d6aee34 1244 AliTRDcluster *cl = NULL;
41702fec 1245
1246 Double_t xref = CalculateReferenceX(tracklets);
6e39bde4 1247 Double_t x, y, z, t, tilt, dx, w, we, erry, errz;
1248 Double_t uvt[4], sumPolY[5], sumPolZ[3];
1249 memset(sumPolY, 0, sizeof(Double_t) * 5);
1250 memset(sumPolZ, 0, sizeof(Double_t) * 3);
41702fec 1251 Int_t nPoints = 0;
1252 // Containers for Least-square fitter
1253 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1254 if(!tracklets[ipl].IsOK()) continue;
ed15ef4f 1255 tilt = tracklets[ipl].GetTilt();
8d2bec9e 1256 for(Int_t itb = 0; itb < AliTRDseedV1::kNclusters; itb++){
41702fec 1257 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1742f24c 1258 if(!cl->IsInChamber()) continue;
c79857d5 1259 if (!tracklets[ipl].IsUsable(itb)) continue;
41702fec 1260 x = cl->GetX();
1261 y = cl->GetY();
1262 z = cl->GetZ();
41702fec 1263 dx = x - xref;
1264 // Transformation
1265 t = 1./(x*x + y*y);
1266 uvt[0] = 2. * x * t;
1267 uvt[1] = t;
1268 uvt[2] = 2. * tilt * t;
1269 uvt[3] = 2. * tilt * dx * t;
1270 w = 2. * (y + tilt*z) * t;
1271 // error definition changes for the different calls
1272 we = 2. * t;
78b7d24c 1273 we *= sigError ? TMath::Sqrt(cl->GetSigmaY2()+tilt*tilt*cl->GetSigmaZ2()) : 0.2;
41702fec 1274 fitter->AddPoint(uvt, w, we);
1275 zfitter.AddPoint(&x, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
6e39bde4 1276 // adding points for covariance matrix estimation
1277 erry = 1./(TMath::Sqrt(cl->GetSigmaY2()) + 0.1); // 0.1 is a systematic error (due to misalignment and miscalibration)
1278 erry *= erry;
1279 errz = 1./cl->GetSigmaZ2();
1280 for(Int_t ipol = 0; ipol < 5; ipol++){
1281 sumPolY[ipol] += erry;
1282 erry *= x;
1283 if(ipol < 3){
1284 sumPolZ[ipol] += errz;
1285 errz *= x;
1286 }
1287 }
41702fec 1288 nPoints++;
1289 }
1290 }
c08b1cc7 1291 if (fitter->Eval()) return 1.e10;
41702fec 1292 zfitter.Eval();
1293
1294 Double_t offset = fitter->GetParameter(3);
1295 Double_t slope = fitter->GetParameter(4);
1296
1297 // Linear fitter - not possible to make boundaries
1298 // Do not accept non possible z and dzdx combinations
1299 Bool_t acceptablez = kTRUE;
1300 Double_t zref = 0.0;
1301 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
1302 if(!tracklets[iLayer].IsOK()) continue;
1303 zref = offset + slope * (tracklets[iLayer].GetX0() - xref);
e3cf3d02 1304 if (TMath::Abs(tracklets[iLayer].GetZfit(0) - zref) > tracklets[iLayer].GetPadLength() * 0.5 + 1.0)
41702fec 1305 acceptablez = kFALSE;
1306 }
1307 if (!acceptablez) {
1308 Double_t dzmf = zfitter.GetFunctionParameter(1);
1309 Double_t zmf = zfitter.GetFunctionValue(&xref);
1310 fgTiltedRieman->FixParameter(3, zmf);
1311 fgTiltedRieman->FixParameter(4, dzmf);
e17f4785 1312 fitter->Eval();
41702fec 1313 fitter->ReleaseParameter(3);
1314 fitter->ReleaseParameter(4);
1315 offset = fitter->GetParameter(3);
1316 slope = fitter->GetParameter(4);
1317 }
1318
1319 // Calculate Curvarture
1320 Double_t a = fitter->GetParameter(0);
1321 Double_t b = fitter->GetParameter(1);
1322 Double_t c = fitter->GetParameter(2);
1323 Double_t curvature = 1.0 + b*b - c*a;
68f9b6bd 1324 if (curvature > 0.0) curvature = a / TMath::Sqrt(curvature);
41702fec 1325
1326 Double_t chi2track = fitter->GetChisquare()/Double_t(nPoints);
1327
6e39bde4 1328 // Prepare error calculation
1329 TMatrixD covarPolY(3,3);
1330 covarPolY(0,0) = sumPolY[0]; covarPolY(1,1) = sumPolY[2]; covarPolY(2,2) = sumPolY[4];
1331 covarPolY(0,1) = covarPolY(1,0) = sumPolY[1];
1332 covarPolY(0,2) = covarPolY(2,0) = sumPolY[2];
1333 covarPolY(2,1) = covarPolY(1,2) = sumPolY[3];
1334 covarPolY.Invert();
1335 TMatrixD covarPolZ(2,2);
1336 covarPolZ(0,0) = sumPolZ[0]; covarPolZ(1,1) = sumPolZ[2];
1337 covarPolZ(1,0) = covarPolZ(0,1) = sumPolZ[1];
1338 covarPolZ.Invert();
1339
41702fec 1340 // Update the tracklets
d2eba04b 1341 Double_t dy, dz;
6e39bde4 1342 Double_t cov[15];
1343 memset(cov, 0, sizeof(Double_t) * 15);
41702fec 1344 for(Int_t iLayer = 0; iLayer < AliTRDtrackerV1::kNPlanes; iLayer++) {
1345
1346 x = tracklets[iLayer].GetX0();
d2eba04b 1347// x1 = x - xref;
41702fec 1348 y = 0;
1349 z = 0;
1350 dy = 0;
1351 dz = 0;
6e39bde4 1352 memset(cov, 0, sizeof(Double_t) * 3);
1353 TMatrixD transform(3,3);
1354 transform(0,0) = 1;
1355 transform(0,1) = x;
1356 transform(0,2) = x*x;
1357 transform(1,1) = 1;
1358 transform(1,2) = x;
1359 transform(2,2) = 1;
1360 TMatrixD covariance(transform, TMatrixD::kMult, covarPolY);
1361 covariance *= transform.T();
1362 TMatrixD transformZ(2,2);
1363 transformZ(0,0) = transformZ(1,1) = 1;
1364 transformZ(0,1) = x;
1365 TMatrixD covarZ(transformZ, TMatrixD::kMult, covarPolZ);
1366 covarZ *= transformZ.T();
41702fec 1367 // y: R^2 = (x - x0)^2 + (y - y0)^2
1368 // => y = y0 +/- Sqrt(R^2 - (x - x0)^2)
1369 // R = Sqrt() = 1/Curvature
1370 // => y = y0 +/- Sqrt(1/Curvature^2 - (x - x0)^2)
1371 Double_t res = (x * a + b); // = (x - x0)/y0
1372 res *= res;
1373 res = 1.0 - c * a + b * b - res; // = (R^2 - (x - x0)^2)/y0^2
1374 if (res >= 0) {
1375 res = TMath::Sqrt(res);
1376 y = (1.0 - res) / a;
1377 }
6e39bde4 1378 cov[0] = covariance(0,0);
1379 cov[2] = covarZ(0,0);
1380 cov[1] = 0.;
41702fec 1381
1382 // dy: R^2 = (x - x0)^2 + (y - y0)^2
1383 // => y = +/- Sqrt(R^2 - (x - x0)^2) + y0
1384 // => dy/dx = (x - x0)/Sqrt(R^2 - (x - x0)^2)
1385 // Curvature: cr = 1/R = a/Sqrt(1 + b^2 - c*a)
1386 // => dy/dx = (x - x0)/(1/(cr^2) - (x - x0)^2)
1387 Double_t x0 = -b / a;
1388 if (-c * a + b * b + 1 > 0) {
1389 if (1.0/(curvature * curvature) - (x - x0) * (x - x0) > 0.0) {
6e39bde4 1390 Double_t yderiv = (x - x0) / TMath::Sqrt(1.0/(curvature * curvature) - (x - x0) * (x - x0));
1391 if (a < 0) yderiv *= -1.0;
1392 dy = yderiv;
41702fec 1393 }
1394 }
1395 z = offset + slope * (x - xref);
1396 dz = slope;
1397 tracklets[iLayer].SetYref(0, y);
1398 tracklets[iLayer].SetYref(1, dy);
1399 tracklets[iLayer].SetZref(0, z);
1400 tracklets[iLayer].SetZref(1, dz);
1401 tracklets[iLayer].SetC(curvature);
6e39bde4 1402 tracklets[iLayer].SetCovRef(cov);
41702fec 1403 tracklets[iLayer].SetChi2(chi2track);
1404 }
68f9b6bd 1405 if(AliLog::GetDebugLevel("TRD", "AliTRDtrackerV1")>3) printf("D-AliTRDtrackerV1::FitTiltedRieman: Chi2[%f] C[%5.2e] pt[%8.3f]\n", chi2track, curvature, GetBz()*kB2C/curvature);
41702fec 1406
a2fbb6ec 1407/* if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) >=5){
1408 TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
41702fec 1409 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
1410 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
1411 Double_t chi2z = CalculateChi2Z(tracklets, offset, slope, xref);
1412 cstreamer << "FitTiltedRieman0"
1413 << "EventNumber=" << eventNumber
1414 << "CandidateNumber=" << candidateNumber
1415 << "xref=" << xref
1416 << "Chi2Z=" << chi2z
1417 << "\n";
3a039a31 1418 }*/
41702fec 1419 return chi2track;
eb38ed55 1420}
1421
3b57a3f7 1422
9e333711 1423//____________________________________________________________________
6e4d4425 1424Double_t AliTRDtrackerV1::FitLine(const AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t err, Int_t np, AliTrackPoint *points)
9e333711 1425{
4d6aee34 1426 //
1427 // Fit track with a staight line
1428 // Fills an AliTrackPoint array with np points
1429 // Function should be used to refit tracks when no magnetic field was on
1430 //
9e333711 1431 AliTRDLeastSquare yfitter, zfitter;
4d6aee34 1432 AliTRDcluster *cl = NULL;
9e333711 1433
4d6aee34 1434 AliTRDseedV1 work[kNPlanes], *tracklet = NULL;
9e333711 1435 if(!tracklets){
1436 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1437 if(!(tracklet = track->GetTracklet(ipl))) continue;
1438 if(!tracklet->IsOK()) continue;
1439 new(&work[ipl]) AliTRDseedV1(*tracklet);
1440 }
1441 tracklets = &work[0];
1442 }
1443
1444 Double_t xref = CalculateReferenceX(tracklets);
1445 Double_t x, y, z, dx, ye, yr, tilt;
1446 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1447 if(!tracklets[ipl].IsOK()) continue;
1448 for(Int_t itb = 0; itb < fgNTimeBins; itb++){
1449 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1450 if (!tracklets[ipl].IsUsable(itb)) continue;
1451 x = cl->GetX();
1452 z = cl->GetZ();
1453 dx = x - xref;
1454 zfitter.AddPoint(&dx, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
1455 }
1456 }
1457 zfitter.Eval();
1458 Double_t z0 = zfitter.GetFunctionParameter(0);
1459 Double_t dzdx = zfitter.GetFunctionParameter(1);
1460 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1461 if(!tracklets[ipl].IsOK()) continue;
1462 for(Int_t itb = 0; itb < fgNTimeBins; itb++){
1463 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1464 if (!tracklets[ipl].IsUsable(itb)) continue;
1465 x = cl->GetX();
1466 y = cl->GetY();
1467 z = cl->GetZ();
1468 tilt = tracklets[ipl].GetTilt();
1469 dx = x - xref;
1470 yr = y + tilt*(z - z0 - dzdx*dx);
1471 // error definition changes for the different calls
1472 ye = tilt*TMath::Sqrt(cl->GetSigmaZ2());
1473 ye += err ? tracklets[ipl].GetSigmaY() : 0.2;
1474 yfitter.AddPoint(&dx, yr, ye);
1475 }
1476 }
1477 yfitter.Eval();
1478 Double_t y0 = yfitter.GetFunctionParameter(0);
1479 Double_t dydx = yfitter.GetFunctionParameter(1);
1480 Double_t chi2 = 0.;//yfitter.GetChisquare()/Double_t(nPoints);
1481
1482 //update track points array
1483 if(np && points){
1484 Float_t xyz[3];
1485 for(int ip=0; ip<np; ip++){
1486 points[ip].GetXYZ(xyz);
1487 xyz[1] = y0 + dydx * (xyz[0] - xref);
1488 xyz[2] = z0 + dzdx * (xyz[0] - xref);
1489 points[ip].SetXYZ(xyz);
1490 }
1491 }
1492 return chi2;
1493}
1494
1495
3b57a3f7 1496//_________________________________________________________________________
6e4d4425 1497Double_t AliTRDtrackerV1::FitRiemanTilt(const AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t sigError, Int_t np, AliTrackPoint *points)
3b57a3f7 1498{
0fa1a8ee 1499//
1500// Performs a Riemann fit taking tilting pad correction into account
1501//
1502// Paramters: - Array of tracklets (connected to the track candidate)
1503// - Flag selecting the error definition
1504// Output: - Chi2 values of the track (in Parameter list)
1505//
1506// The equations which has to be solved simultaneously are:
1507// BEGIN_LATEX
1508// R^{2} = (x-x_{0})^{2} + (y^{*}-y_{0})^{2}
1509// y^{*} = y - tg(h)(z - z_{t})
1510// z_{t} = z_{0}+dzdx*(x-x_{r})
1511// END_LATEX
1512// with (x, y, z) the coordinate of the cluster, (x_0, y_0, z_0) the coordinate of the center of the Riemann circle,
1513// R its radius, x_r a constant refrence radial position in the middle of the TRD stack and dzdx the slope of the
1514// track in the x-z plane. Using the following transformations
1515// BEGIN_LATEX
1516// t = 1 / (x^{2} + y^{2})
1517// u = 2 * x * t
1518// v = 2 * tan(h) * t
1519// w = 2 * tan(h) * (x - x_{r}) * t
1520// END_LATEX
1521// One gets the following linear equation
1522// BEGIN_LATEX
1523// a + b * u + c * t + d * v + e * w = 2 * (y + tg(h) * z) * t
1524// END_LATEX
1525// where the coefficients have the following meaning
1526// BEGIN_LATEX
1527// a = -1/y_{0}
1528// b = x_{0}/y_{0}
1529// c = (R^{2} -x_{0}^{2} - y_{0}^{2})/y_{0}
1530// d = z_{0}
1531// e = dz/dx
1532// END_LATEX
1533// The error calculation for the free term is thus
1534// BEGIN_LATEX
1535// #sigma = 2 * #sqrt{#sigma^{2}_{y} + (tilt corr ...) + tg^{2}(h) * #sigma^{2}_{z}} * t
1536// END_LATEX
1537//
1538// From this simple model one can compute chi^2 estimates and a rough approximation of pt from the curvature according
1539// to the formula:
1540// BEGIN_LATEX
1541// C = 1/R = a/(1 + b^{2} + c*a)
1542// END_LATEX
1543//
1544// Authors
1545// M.Ivanov <M.Ivanov@gsi.de>
1546// A.Bercuci <A.Bercuci@gsi.de>
1547// M.Fasel <M.Fasel@gsi.de>
1548
41702fec 1549 TLinearFitter *fitter = GetTiltedRiemanFitter();
1550 fitter->StoreData(kTRUE);
1551 fitter->ClearPoints();
1552 AliTRDLeastSquare zfitter;
4d6aee34 1553 AliTRDcluster *cl = NULL;
3b57a3f7 1554
4d6aee34 1555 AliTRDseedV1 work[kNPlanes], *tracklet = NULL;
3b57a3f7 1556 if(!tracklets){
1557 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1558 if(!(tracklet = track->GetTracklet(ipl))) continue;
1559 if(!tracklet->IsOK()) continue;
1560 new(&work[ipl]) AliTRDseedV1(*tracklet);
1561 }
1562 tracklets = &work[0];
1563 }
1564
41702fec 1565 Double_t xref = CalculateReferenceX(tracklets);
68f9b6bd 1566 if(AliLog::GetDebugLevel("TRD", "AliTRDtrackerV1")>3) printf("D-AliTRDtrackerV1::FitRiemanTilt:\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 1567 Double_t x, y, z, t, tilt, dx, w, we;
1568 Double_t uvt[4];
1569 Int_t nPoints = 0;
1570 // Containers for Least-square fitter
1571 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1572 if(!tracklets[ipl].IsOK()) continue;
8d2bec9e 1573 for(Int_t itb = 0; itb < AliTRDseedV1::kNclusters; itb++){
41702fec 1574 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
352cef8f 1575 //if (!tracklets[ipl].IsUsable(itb)) continue;
41702fec 1576 x = cl->GetX();
1577 y = cl->GetY();
1578 z = cl->GetZ();
1579 tilt = tracklets[ipl].GetTilt();
1580 dx = x - xref;
1581 // Transformation
1582 t = 1./(x*x + y*y);
1583 uvt[0] = 2. * x * t;
1584 uvt[1] = t;
1585 uvt[2] = 2. * tilt * t;
1586 uvt[3] = 2. * tilt * dx * t;
1587 w = 2. * (y + tilt*z) * t;
1588 // error definition changes for the different calls
1589 we = 2. * t;
f29f13a6 1590 we *= sigError ? TMath::Sqrt(cl->GetSigmaY2()) : 0.2;
41702fec 1591 fitter->AddPoint(uvt, w, we);
1592 zfitter.AddPoint(&x, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
1593 nPoints++;
1594 }
1595 }
aec26713 1596 if(fitter->Eval()) return 1.E10;
1597
41702fec 1598 Double_t z0 = fitter->GetParameter(3);
1599 Double_t dzdx = fitter->GetParameter(4);
3b57a3f7 1600
1601
1602 // Linear fitter - not possible to make boundaries
1603 // Do not accept non possible z and dzdx combinations
1604 Bool_t accept = kTRUE;
1605 Double_t zref = 0.0;
1606 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
1607 if(!tracklets[iLayer].IsOK()) continue;
1608 zref = z0 + dzdx * (tracklets[iLayer].GetX0() - xref);
e3cf3d02 1609 if (TMath::Abs(tracklets[iLayer].GetZfit(0) - zref) > tracklets[iLayer].GetPadLength() * 0.5 + 1.0)
3b57a3f7 1610 accept = kFALSE;
1611 }
1612 if (!accept) {
41702fec 1613 zfitter.Eval();
3b57a3f7 1614 Double_t dzmf = zfitter.GetFunctionParameter(1);
1615 Double_t zmf = zfitter.GetFunctionValue(&xref);
1616 fitter->FixParameter(3, zmf);
1617 fitter->FixParameter(4, dzmf);
e17f4785 1618 fitter->Eval();
3b57a3f7 1619 fitter->ReleaseParameter(3);
1620 fitter->ReleaseParameter(4);
1621 z0 = fitter->GetParameter(3); // = zmf ?
1622 dzdx = fitter->GetParameter(4); // = dzmf ?
1623 }
1624
1625 // Calculate Curvature
1626 Double_t a = fitter->GetParameter(0);
1627 Double_t b = fitter->GetParameter(1);
1628 Double_t c = fitter->GetParameter(2);
1629 Double_t y0 = 1. / a;
1630 Double_t x0 = -b * y0;
a015e406 1631 Double_t tmp = y0*y0 + x0*x0 - c*y0;
1632 if(tmp<=0.) return 1.E10;
4d6aee34 1633 Double_t radius = TMath::Sqrt(tmp);
1634 Double_t curvature = 1.0 + b*b - c*a;
1635 if (curvature > 0.0) curvature = a / TMath::Sqrt(curvature);
3b57a3f7 1636
1637 // Calculate chi2 of the fit
1638 Double_t chi2 = fitter->GetChisquare()/Double_t(nPoints);
68f9b6bd 1639 if(AliLog::GetDebugLevel("TRD", "AliTRDtrackerV1")>3) printf("D-AliTRDtrackerV1::FitRiemanTilt:x0[%6.2f] y0[%6.2f] R[%6.2f] chi2[%f]\n", x0, y0, radius, chi2);
3b57a3f7 1640
1641 // Update the tracklets
1642 if(!track){
1643 for(Int_t ip = 0; ip < kNPlanes; ip++) {
1644 x = tracklets[ip].GetX0();
4d6aee34 1645 tmp = radius*radius-(x-x0)*(x-x0);
a015e406 1646 if(tmp <= 0.) continue;
1647 tmp = TMath::Sqrt(tmp);
3b57a3f7 1648
1649 // y: R^2 = (x - x0)^2 + (y - y0)^2
1650 // => y = y0 +/- Sqrt(R^2 - (x - x0)^2)
1651 tracklets[ip].SetYref(0, y0 - (y0>0.?1.:-1)*tmp);
1652 // => dy/dx = (x - x0)/Sqrt(R^2 - (x - x0)^2)
1653 tracklets[ip].SetYref(1, (x - x0) / tmp);
1654 tracklets[ip].SetZref(0, z0 + dzdx * (x - xref));
1655 tracklets[ip].SetZref(1, dzdx);
4d6aee34 1656 tracklets[ip].SetC(curvature);
3b57a3f7 1657 tracklets[ip].SetChi2(chi2);
1658 }
1659 }
3b57a3f7 1660 //update track points array
1661 if(np && points){
1662 Float_t xyz[3];
1663 for(int ip=0; ip<np; ip++){
1664 points[ip].GetXYZ(xyz);
4d6aee34 1665 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 1666 xyz[2] = z0 + dzdx * (xyz[0] - xref);
1667 points[ip].SetXYZ(xyz);
1668 }
1669 }
1670
3b57a3f7 1671 return chi2;
1672}
1673
1674
1bf51039 1675//____________________________________________________________________
e17f4785 1676Double_t AliTRDtrackerV1::FitKalman(AliTRDtrackV1 *track, AliTRDseedV1 * const tracklets, Bool_t up, Int_t np, AliTrackPoint *points)
1bf51039 1677{
1678// Kalman filter implementation for the TRD.
1679// It returns the positions of the fit in the array "points"
1680//
1681// Author : A.Bercuci@gsi.de
1682
3cfaffa4 1683 // printf("Start track @ x[%f]\n", track->GetX());
1bf51039 1684
1685 //prepare marker points along the track
1686 Int_t ip = np ? 0 : 1;
1687 while(ip<np){
1688 if((up?-1:1) * (track->GetX() - points[ip].GetX()) > 0.) break;
1689 //printf("AliTRDtrackerV1::FitKalman() : Skip track marker x[%d] = %7.3f. Before track start ( %7.3f ).\n", ip, points[ip].GetX(), track->GetX());
1690 ip++;
1691 }
1692 //if(points) printf("First marker point @ x[%d] = %f\n", ip, points[ip].GetX());
1693
1694
d8069611 1695 AliTRDseedV1 tracklet;
1696 AliTRDseedV1 *ptrTracklet = NULL;
1bf51039 1697
1698 //Loop through the TRD planes
1699 for (Int_t jplane = 0; jplane < kNPlanes; jplane++) {
1700 // GET TRACKLET OR BUILT IT
1701 Int_t iplane = up ? jplane : kNPlanes - 1 - jplane;
1702 if(tracklets){
e17f4785 1703 if(!(ptrTracklet = &tracklets[iplane])) continue;
1bf51039 1704 }else{
1705 if(!(ptrTracklet = track->GetTracklet(iplane))){
4d6aee34 1706 /*AliTRDtrackerV1 *tracker = NULL;
a2fbb6ec 1707 if(!(tracker = dynamic_cast<AliTRDtrackerV1*>( AliTRDrecoParam:Tracker()))) continue;
1bf51039 1708 ptrTracklet = new(&tracklet) AliTRDseedV1(iplane);
1709 if(!tracker->MakeTracklet(ptrTracklet, track)) */
1710 continue;
1711 }
1712 }
1713 if(!ptrTracklet->IsOK()) continue;
1714
1715 Double_t x = ptrTracklet->GetX0();
1716
1717 while(ip < np){
1718 //don't do anything if next marker is after next update point.
952051c5 1719 if((up?-1:1) * (points[ip].GetX() - x) - AliTRDReconstructor::GetMaxStep() < 0) break;
1720 if(((up?-1:1) * (points[ip].GetX() - track->GetX()) < 0) && !PropagateToX(*track, points[ip].GetX(), AliTRDReconstructor::GetMaxStep())) return -1.;
1bf51039 1721
1722 Double_t xyz[3]; // should also get the covariance
3cfaffa4 1723 track->GetXYZ(xyz);
1724 track->Global2LocalPosition(xyz, track->GetAlpha());
1725 points[ip].SetXYZ(xyz[0], xyz[1], xyz[2]);
1bf51039 1726 ip++;
1727 }
3cfaffa4 1728 // printf("plane[%d] tracklet[%p] x[%f]\n", iplane, ptrTracklet, x);
1bf51039 1729
3cfaffa4 1730 // Propagate closer to the next update point
952051c5 1731 if(((up?-1:1) * (x - track->GetX()) + AliTRDReconstructor::GetMaxStep() < 0) && !PropagateToX(*track, x + (up?-1:1)*AliTRDReconstructor::GetMaxStep(), AliTRDReconstructor::GetMaxStep())) return -1.;
1bf51039 1732
1733 if(!AdjustSector(track)) return -1;
952051c5 1734 if(TMath::Abs(track->GetSnp()) > AliTRDReconstructor::GetMaxSnp()) return -1;
1bf51039 1735
1736 //load tracklet to the tracker and the track
1737/* Int_t index;
1738 if((index = FindTracklet(ptrTracklet)) < 0){
1739 ptrTracklet = SetTracklet(&tracklet);
1740 index = fTracklets->GetEntriesFast()-1;
1741 }
1742 track->SetTracklet(ptrTracklet, index);*/
1743
1744
1745 // register tracklet to track with tracklet creation !!
1746 // PropagateBack : loaded tracklet to the tracker and update index
1747 // RefitInward : update index
1748 // MakeTrack : loaded tracklet to the tracker and update index
1749 if(!tracklets) track->SetTracklet(ptrTracklet, -1);
1750
1751
1752 //Calculate the mean material budget along the path inside the chamber
1753 Double_t xyz0[3]; track->GetXYZ(xyz0);
1754 Double_t alpha = track->GetAlpha();
1755 Double_t xyz1[3], y, z;
1756 if(!track->GetProlongation(x, y, z)) return -1;
1757 xyz1[0] = x * TMath::Cos(alpha) - y * TMath::Sin(alpha);
1758 xyz1[1] = +x * TMath::Sin(alpha) + y * TMath::Cos(alpha);
1759 xyz1[2] = z;
fbe11be7 1760 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 1761 Double_t param[7];
3cfaffa4 1762 if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param) <=0.) break;
1bf51039 1763 Double_t xrho = param[0]*param[4]; // density*length
1764 Double_t xx0 = param[1]; // radiation length
1765
1766 //Propagate the track
1767 track->PropagateTo(x, xx0, xrho);
1768 if (!AdjustSector(track)) break;
1769
1770 //Update track
b72f4eaf 1771 Double_t cov[3]; ptrTracklet->GetCovAt(x, cov);
1772 Double_t p[2] = { ptrTracklet->GetY(), ptrTracklet->GetZ()};
1773 Double_t chi2 = ((AliExternalTrackParam*)track)->GetPredictedChi2(p, cov);
ef867f55 1774 if(chi2<1e+10) ((AliExternalTrackParam*)track)->Update(p, cov);
1bf51039 1775 if(!up) continue;
1776
1777 //Reset material budget if 2 consecutive gold
1778 if(iplane>0 && track->GetTracklet(iplane-1) && ptrTracklet->GetN() + track->GetTracklet(iplane-1)->GetN() > 20) track->SetBudget(2, 0.);
1779 } // end planes loop
1780
1781 // extrapolation
1782 while(ip < np){
952051c5 1783 if(((up?-1:1) * (points[ip].GetX() - track->GetX()) < 0) && !PropagateToX(*track, points[ip].GetX(), AliTRDReconstructor::GetMaxStep())) return -1.;
1bf51039 1784
1785 Double_t xyz[3]; // should also get the covariance
3cfaffa4 1786 track->GetXYZ(xyz);
1787 track->Global2LocalPosition(xyz, track->GetAlpha());
1788 points[ip].SetXYZ(xyz[0], xyz[1], xyz[2]);
1bf51039 1789 ip++;
1790 }
1791
1792 return track->GetChi2();
1793}
3b57a3f7 1794
eb38ed55 1795//_________________________________________________________________________
d8069611 1796Float_t AliTRDtrackerV1::CalculateChi2Z(const AliTRDseedV1 *tracklets, Double_t offset, Double_t slope, Double_t xref)
eb38ed55 1797{
41702fec 1798 //
1799 // Calculates the chi2-value of the track in z-Direction including tilting pad correction.
1800 // A linear dependence on the x-value serves as a model.
1801 // The parameters are related to the tilted Riemann fit.
1802 // Parameters: - Array of tracklets (AliTRDseedV1) related to the track candidate
1803 // - the offset for the reference x
1804 // - the slope
1805 // - the reference x position
1806 // Output: - The Chi2 value of the track in z-Direction
1807 //
1808 Float_t chi2Z = 0, nLayers = 0;
053767a4 1809 for (Int_t iLayer = 0; iLayer < AliTRDgeometry::kNlayer; iLayer++) {
41702fec 1810 if(!tracklets[iLayer].IsOK()) continue;
1811 Double_t z = offset + slope * (tracklets[iLayer].GetX0() - xref);
e3cf3d02 1812 chi2Z += TMath::Abs(tracklets[iLayer].GetZfit(0) - z);
41702fec 1813 nLayers++;
1814 }
1815 chi2Z /= TMath::Max((nLayers - 3.0),1.0);
1816 return chi2Z;
eb38ed55 1817}
1818
bccda319 1819//_____________________________________________________________________________
1820Int_t AliTRDtrackerV1::PropagateToX(AliTRDtrackV1 &t, Double_t xToGo, Double_t maxStep)
1821{
41702fec 1822 //
1823 // Starting from current X-position of track <t> this function
1824 // extrapolates the track up to radial position <xToGo>.
1825 // Returns 1 if track reaches the plane, and 0 otherwise
1826 //
bccda319 1827
41702fec 1828 // Current track X-position
15a2657d 1829 Double_t xpos = t.GetX()/*,
1830 mass = t.GetMass()*/;
bccda319 1831
41702fec 1832 // Direction: inward or outward
1833 Double_t dir = (xpos < xToGo) ? 1.0 : -1.0;
bccda319 1834
952051c5 1835 while (((xToGo - xpos) * dir) > AliTRDReconstructor::GetEpsilon()) {
2f4384e6 1836// printf("to go %f\n", (xToGo - xpos) * dir);
41702fec 1837 Double_t xyz0[3];
1838 Double_t xyz1[3];
1839 Double_t param[7];
1840 Double_t x;
1841 Double_t y;
1842 Double_t z;
bccda319 1843
41702fec 1844 // The next step size
1845 Double_t step = dir * TMath::Min(TMath::Abs(xToGo-xpos),maxStep);
bccda319 1846
41702fec 1847 // Get the global position of the starting point
1848 t.GetXYZ(xyz0);
bccda319 1849
41702fec 1850 // X-position after next step
1851 x = xpos + step;
bccda319 1852
41702fec 1853 // Get local Y and Z at the X-position of the next step
3352b455 1854 if(t.GetProlongation(x,y,z)<0) return 0; // No prolongation possible
bccda319 1855
41702fec 1856 // The global position of the end point of this prolongation step
1857 xyz1[0] = x * TMath::Cos(t.GetAlpha()) - y * TMath::Sin(t.GetAlpha());
1858 xyz1[1] = +x * TMath::Sin(t.GetAlpha()) + y * TMath::Cos(t.GetAlpha());
1859 xyz1[2] = z;
bccda319 1860
41702fec 1861 // Calculate the mean material budget between start and
1862 // end point of this prolongation step
83dea92e 1863 if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param)<=0.) return 0;
2f4384e6 1864
41702fec 1865 // Propagate the track to the X-position after the next step
9c87a076 1866 if (!t.PropagateTo(x, param[1], param[0]*param[4])) return 0;
bccda319 1867
15a2657d 1868/* // Correct for mean material budget
2f4384e6 1869 Double_t dEdx(0.),
1d26da6d 1870 bg(TMath::Abs(t.GetP()/mass));
2f4384e6 1871 if(AliLog::GetDebugLevel("TRD", "AliTRDtrackerV1")>=3){
1872 const char *pn[] = {"rho", "x/X0", "<A>", "<Z>", "L", "<Z/A>", "Nb"};
1873 printf("D-AliTRDtrackerV1::PropagateTo(): x[%6.2f] bg[%6.2f]\n", xpos, bg);
1874 printf(" param :: %s[%e] %s[%e] %s[%e] %s[%e] %s[%e] %s[%e] %s[%e]\n"
1875 , pn[0], param[0]
1876 , pn[1], param[1]
1877 , pn[2], param[2]
1878 , pn[3], param[3]
1879 , pn[4], param[4]
1880 , pn[5], param[5]
1881 , pn[6], param[6]);
1882 }
1883 switch(fgBB){
1884 case kSolid:
1885 dEdx = AliExternalTrackParam::BetheBlochSolid(bg);
1886 break;
1887 case kGas:
1888 dEdx = AliExternalTrackParam::BetheBlochGas(bg);
1889 break;
1890 case kGeant:
1891 { // mean exitation energy (GeV)
1892 Double_t mee = ((param[3] < 13.) ? (12. * param[3] + 7.) : (9.76 * param[3] + 58.8 * TMath::Power(param[3],-0.19))) * 1.e-9;
1893 Double_t mZA = param[5]>1.e-5?param[5]:(param[3]/param[2]);
1894 if(AliLog::GetDebugLevel("TRD", "AliTRDtrackerV1")>=3) printf("D-AliTRDtrackerV1::PropagateTo(): Mee[%e] <Z/A>[%e]\n", mee, mZA);
1895 // protect against failed calculation of rho in MeanMaterialBudget()
1896 dEdx = AliExternalTrackParam::BetheBlochGeant(bg, param[0]>1.e-6?param[0]:2.33, 0.2, 3., mee, mZA);
1897 }
1898 break;
1899 }
1900 if(AliLog::GetDebugLevel("TRD", "AliTRDtrackerV1")>=2) printf("D-AliTRDtrackerV1::PropagateTo(): dEdx(bg=%e, m=%e)= %e[GeV/cm]\n", bg, mass, dEdx);
1901 if (!t.CorrectForMeanMaterialdEdx(param[1], dir*param[0]*param[4], mass, dEdx)) return 0;
15a2657d 1902*/
41702fec 1903 // Rotate the track if necessary
e7542a7e 1904 if(!AdjustSector(&t)) return 0;
bccda319 1905
41702fec 1906 // New track X-position
1907 xpos = t.GetX();
bccda319 1908
41702fec 1909 }
bccda319 1910
41702fec 1911 return 1;
bccda319 1912
1913}
1914
eb38ed55 1915//_____________________________________________________________________________
e7542a7e 1916Bool_t AliTRDtrackerV1::ReadClusters(TTree *clusterTree)
eb38ed55 1917{
41702fec 1918 //
1919 // Reads AliTRDclusters from the file.
1920 // The names of the cluster tree and branches
1921 // should match the ones used in AliTRDclusterizer::WriteClusters()
1922 //
1923
1924 Int_t nsize = Int_t(clusterTree->GetTotBytes() / (sizeof(AliTRDcluster)));
1925 TObjArray *clusterArray = new TObjArray(nsize+1000);
1926
1927 TBranch *branch = clusterTree->GetBranch("TRDcluster");
1928 if (!branch) {
1929 AliError("Can't get the branch !");
e7542a7e 1930 return kFALSE;
41702fec 1931 }
1932 branch->SetAddress(&clusterArray);
d2eba04b 1933
41702fec 1934 if(!fClusters){
9e85cb05 1935 Float_t nclusters = fkRecoParam->GetNClusters();
4d6aee34 1936 if(fkReconstructor->IsHLT()) nclusters /= AliTRDgeometry::kNsector;
e7542a7e 1937 fClusters = new TClonesArray("AliTRDcluster", Int_t(nclusters));
1938 fClusters->SetOwner(kTRUE);
d2eba04b 1939 SetClustersOwner();
1940 AliInfo(Form("Tracker owning clusters @ %p", (void*)fClusters));
41702fec 1941 }
1942
1943 // Loop through all entries in the tree
1944 Int_t nEntries = (Int_t) clusterTree->GetEntries();
1945 Int_t nbytes = 0;
1946 Int_t ncl = 0;
4d6aee34 1947 AliTRDcluster *c = NULL;
41702fec 1948 for (Int_t iEntry = 0; iEntry < nEntries; iEntry++) {
1949 // Import the tree
1950 nbytes += clusterTree->GetEvent(iEntry);
1951
1952 // Get the number of points in the detector
1953 Int_t nCluster = clusterArray->GetEntriesFast();
1954 for (Int_t iCluster = 0; iCluster < nCluster; iCluster++) {
1955 if(!(c = (AliTRDcluster *) clusterArray->UncheckedAt(iCluster))) continue;
41702fec 1956 new((*fClusters)[ncl++]) AliTRDcluster(*c);
1957 delete (clusterArray->RemoveAt(iCluster));
1958 }
41702fec 1959 }
1960 delete clusterArray;
1961
e7542a7e 1962 return kTRUE;
eb38ed55 1963}
1964
1965//_____________________________________________________________________________
1966Int_t AliTRDtrackerV1::LoadClusters(TTree *cTree)
1967{
41702fec 1968 //
66f6bfd9 1969 // Fills clusters into TRD tracking sectors
41702fec 1970 //
41702fec 1971
9e85cb05 1972 fkRecoParam = fkReconstructor->GetRecoParam(); // load reco param for this event
1973
d2eba04b 1974// if(!fkReconstructor->IsWritingClusters()) AliInfo(Form("IsWritingClusters[%c]", fkReconstructor->IsWritingClusters()?'y':'n'));
1975 if(!(fClusters = AliTRDReconstructor::GetClusters())){
1976 AliWarning("Clusters unavailable from TRD reconstructor. Trying reading from tree ...");
48f8adf3 1977 } else {
e7542a7e 1978 if(!ReadClusters(cTree)) {
d2eba04b 1979 AliError("Reading clusters from tree failed.");
66f6bfd9 1980 return 1;
1981 }
1982 }
66f6bfd9 1983
48f8adf3 1984 if(!fClusters || !fClusters->GetEntriesFast()){
66f6bfd9 1985 AliInfo("No TRD clusters");
41702fec 1986 return 1;
d2eba04b 1987 } else AliInfo(Form("Using :: clusters[%d] onl.tracklets[%d] onl.tracks[%d]",
1988 fClusters?fClusters->GetEntriesFast():0,
1989 AliTRDReconstructor::GetTracklets()?AliTRDReconstructor::GetTracklets()->GetEntriesFast():0,
1990 AliTRDReconstructor::GetTracks()?AliTRDReconstructor::GetTracks()->GetEntriesFast():0));
66f6bfd9 1991
66f6bfd9 1992 BuildTrackingContainers();
1993
66f6bfd9 1994 return 0;
1995}
1996
1997//_____________________________________________________________________________
4d6aee34 1998Int_t AliTRDtrackerV1::LoadClusters(TClonesArray * const clusters)
66f6bfd9 1999{
2000 //
2001 // Fills clusters into TRD tracking sectors
2002 // Function for use in the HLT
2003
2004 if(!clusters || !clusters->GetEntriesFast()){
2005 AliInfo("No TRD clusters");
41702fec 2006 return 1;
d2eba04b 2007 } else AliInfo(Form("Using :: external.clusters[%d]", clusters->GetEntriesFast()));
2008
41702fec 2009
66f6bfd9 2010 fClusters = clusters;
66f6bfd9 2011
9e85cb05 2012 fkRecoParam = fkReconstructor->GetRecoParam(); // load reco param for this event
66f6bfd9 2013 BuildTrackingContainers();
2014
66f6bfd9 2015 return 0;
2016}
2017
2018
2019//____________________________________________________________________
2020Int_t AliTRDtrackerV1::BuildTrackingContainers()
2021{
2022// Building tracking containers for clusters
2023
c79857d5 2024 Int_t nin(0), ncl(fClusters->GetEntriesFast());
2025 while (ncl--) {
2026 AliTRDcluster *c = (AliTRDcluster *) fClusters->UncheckedAt(ncl);
41702fec 2027 if(c->IsInChamber()) nin++;
4226b195 2028 if(fkReconstructor->IsHLT()) c->SetRPhiMethod(AliTRDcluster::kCOG);
41702fec 2029 Int_t detector = c->GetDetector();
2030 Int_t sector = fGeom->GetSector(detector);
053767a4 2031 Int_t stack = fGeom->GetStack(detector);
2032 Int_t layer = fGeom->GetLayer(detector);
41702fec 2033
0b559d95 2034 fTrSec[sector].GetChamber(stack, layer, kTRUE)->InsertCluster(c, ncl);
41702fec 2035 }
b0a48c4d 2036
053767a4 2037 for(int isector =0; isector<AliTRDgeometry::kNsector; isector++){
41702fec 2038 if(!fTrSec[isector].GetNChambers()) continue;
c79857d5 2039 fTrSec[isector].Init(fkReconstructor);
41702fec 2040 }
66f6bfd9 2041
2042 return nin;
eb38ed55 2043}
2044
2045
66f6bfd9 2046
0906e73e 2047//____________________________________________________________________
172b6f82 2048void AliTRDtrackerV1::UnloadClusters()
0906e73e 2049{
d4cf71ca 2050//
2051// Clears the arrays of clusters and tracks. Resets sectors and timebins
2052// If option "force" is also set the containers are also deleted. This is useful
2053// in case of HLT
2054
2055 if(fTracks){
2056 fTracks->Delete();
4d6aee34 2057 if(HasRemoveContainers()){delete fTracks; fTracks = NULL;}
d4cf71ca 2058 }
2059 if(fTracklets){
2060 fTracklets->Delete();
4d6aee34 2061 if(HasRemoveContainers()){delete fTracklets; fTracklets = NULL;}
d4cf71ca 2062 }
d2eba04b 2063 if(fClusters && IsClustersOwner()){
2064 AliInfo(Form("tracker[%p] clearing %d own clusters @ %p", (void*)this, fClusters->GetEntries(), (void*)fClusters));
2065 fClusters->Delete();
2066//
2067// // save clusters array in the reconstructor for further use.
2068// if(!fkReconstructor->IsWritingClusters()){
2069// AliTRDReconstructor::SetClusters(fClusters);
2070// SetClustersOwner(kFALSE);
2071// } else AliTRDReconstructor::SetClusters(NULL);
48f8adf3 2072 }
0906e73e 2073
053767a4 2074 for (int i = 0; i < AliTRDgeometry::kNsector; i++) fTrSec[i].Clear();
0906e73e 2075
41702fec 2076 // Increment the Event Number
2077 AliTRDtrackerDebug::SetEventNumber(AliTRDtrackerDebug::GetEventNumber() + 1);
eb38ed55 2078}
0906e73e 2079
fac58f00 2080// //____________________________________________________________________
2081// void AliTRDtrackerV1::UseClusters(const AliKalmanTrack *t, Int_t) const
2082// {
2083// const AliTRDtrackV1 *track = dynamic_cast<const AliTRDtrackV1*>(t);
2084// if(!track) return;
2085//
4d6aee34 2086// AliTRDseedV1 *tracklet = NULL;
fac58f00 2087// for(Int_t ily=AliTRDgeometry::kNlayer; ily--;){
2088// if(!(tracklet = track->GetTracklet(ily))) continue;
4d6aee34 2089// AliTRDcluster *c = NULL;
8d2bec9e 2090// for(Int_t ic=AliTRDseed::kNclusters; ic--;){
fac58f00 2091// if(!(c=tracklet->GetClusters(ic))) continue;
2092// c->Use();
2093// }
2094// }
2095// }
2096//
b1957d3c 2097
eb38ed55 2098//_____________________________________________________________________________
4d6aee34 2099Bool_t AliTRDtrackerV1::AdjustSector(AliTRDtrackV1 *const track)
eb38ed55 2100{
41702fec 2101 //
2102 // Rotates the track when necessary
2103 //
2104
2105 Double_t alpha = AliTRDgeometry::GetAlpha();
2106 Double_t y = track->GetY();
2107 Double_t ymax = track->GetX()*TMath::Tan(0.5*alpha);
3cfaffa4 2108
41702fec 2109 if (y > ymax) {
2110 if (!track->Rotate( alpha)) {
2111 return kFALSE;
2112 }
2113 }
2114 else if (y < -ymax) {
2115 if (!track->Rotate(-alpha)) {
2116 return kFALSE;
2117 }
2118 }
2119
2120 return kTRUE;
0906e73e 2121
2122}
2123
eb38ed55 2124
0906e73e 2125//____________________________________________________________________
33ab3872 2126AliTRDseedV1* AliTRDtrackerV1::GetTracklet(const AliTRDtrackV1 *const track, Int_t p, Int_t &idx)
0906e73e 2127{
41702fec 2128 // Find tracklet for TRD track <track>
2129 // Parameters
2130 // - track
2131 // - sector
2132 // - plane
2133 // - index
2134 // Output
2135 // tracklet
2136 // index
2137 // Detailed description
2138 //
2139 idx = track->GetTrackletIndex(p);
17896e82 2140 AliTRDseedV1 *tracklet = (idx<0) ? NULL : (AliTRDseedV1*)fTracklets->UncheckedAt(idx);
41702fec 2141
2142 return tracklet;
0906e73e 2143}
2144
2145//____________________________________________________________________
4d6aee34 2146AliTRDseedV1* AliTRDtrackerV1::SetTracklet(const AliTRDseedV1 * const tracklet)
0906e73e 2147{
41702fec 2148 // Add this tracklet to the list of tracklets stored in the tracker
2149 //
2150 // Parameters
2151 // - tracklet : pointer to the tracklet to be added to the list
2152 //
2153 // Output
2154 // - the index of the new tracklet in the tracker tracklets list
2155 //
2156 // Detailed description
2157 // Build the tracklets list if it is not yet created (late initialization)
2158 // and adds the new tracklet to the list.
2159 //
2160 if(!fTracklets){
053767a4 2161 fTracklets = new TClonesArray("AliTRDseedV1", AliTRDgeometry::Nsector()*kMaxTracksStack);
41702fec 2162 fTracklets->SetOwner(kTRUE);
2163 }
2164 Int_t nentries = fTracklets->GetEntriesFast();
2165 return new ((*fTracklets)[nentries]) AliTRDseedV1(*tracklet);
972ef65e 2166}
2167
d20df6fc 2168//____________________________________________________________________
4d6aee34 2169AliTRDtrackV1* AliTRDtrackerV1::SetTrack(const AliTRDtrackV1 * const track)
d20df6fc 2170{
2171 // Add this track to the list of tracks stored in the tracker
2172 //
2173 // Parameters
2174 // - track : pointer to the track to be added to the list
2175 //
2176 // Output
2177 // - the pointer added
2178 //
2179 // Detailed description
2180 // Build the tracks list if it is not yet created (late initialization)
2181 // and adds the new track to the list.
2182 //
2183 if(!fTracks){
053767a4 2184 fTracks = new TClonesArray("AliTRDtrackV1", AliTRDgeometry::Nsector()*kMaxTracksStack);
d20df6fc 2185 fTracks->SetOwner(kTRUE);
2186 }
2187 Int_t nentries = fTracks->GetEntriesFast();
2188 return new ((*fTracks)[nentries]) AliTRDtrackV1(*track);
2189}
2190
2191
0906e73e 2192
e4f2f73d 2193//____________________________________________________________________
eb38ed55 2194Int_t AliTRDtrackerV1::Clusters2TracksSM(Int_t sector, AliESDEvent *esd)
e4f2f73d 2195{
41702fec 2196 //
2197 // Steer tracking for one SM.
2198 //
2199 // Parameters :
2200 // sector : Array of (SM) propagation layers containing clusters
2201 // esd : The current ESD event. On output it contains the also
2202 // the ESD (TRD) tracks found in this SM.
2203 //
2204 // Output :
2205 // Number of tracks found in this TRD supermodule.
2206 //
2207 // Detailed description
2208 //
2209 // 1. Unpack AliTRDpropagationLayers objects for each stack.
2210 // 2. Launch stack tracking.
2211 // See AliTRDtrackerV1::Clusters2TracksStack() for details.
2212 // 3. Pack results in the ESD event.
2213 //
2214
41702fec 2215 Int_t nTracks = 0;
2216 Int_t nChambers = 0;
4d6aee34 2217 AliTRDtrackingChamber **stack = NULL, *chamber = NULL;
053767a4 2218 for(int istack = 0; istack<AliTRDgeometry::kNstack; istack++){
41702fec 2219 if(!(stack = fTrSec[sector].GetStack(istack))) continue;
2220 nChambers = 0;
053767a4 2221 for(int ilayer=0; ilayer<AliTRDgeometry::kNlayer; ilayer++){
2222 if(!(chamber = stack[ilayer])) continue;
9e85cb05 2223 if(chamber->GetNClusters() < fgNTimeBins * fkRecoParam->GetFindableClusters()) continue;
41702fec 2224 nChambers++;
053767a4 2225 //AliInfo(Form("sector %d stack %d layer %d clusters %d", sector, istack, ilayer, chamber->GetNClusters()));
41702fec 2226 }
2227 if(nChambers < 4) continue;
2228 //AliInfo(Form("Doing stack %d", istack));
b1135f96 2229 nTracks += Clusters2TracksStack(stack, fTracksESD);
41702fec 2230 }
050875b0 2231 if(nTracks) AliDebug(2, Form("Number of tracks: SM_%02d[%d]", sector, nTracks));
2232
352cef8f 2233 for(int itrack=0; itrack<nTracks; itrack++){
2234 AliESDtrack *esdTrack((AliESDtrack*)(fTracksESD->operator[](itrack)));
2235 Int_t id = esd->AddTrack(esdTrack);
2236
2237 // set ESD id to stand alone TRD tracks
9e85cb05 2238 if (fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 0){
352cef8f 2239 esdTrack=esd->GetTrack(id);
2240 TObject *o(NULL); Int_t ic(0);
2241 AliTRDtrackV1 *calibTrack(NULL);
2242 while((o = esdTrack->GetCalibObject(ic++))){
2243 if(!(calibTrack = dynamic_cast<AliTRDtrackV1*>(o))) continue;
2244 calibTrack->SetESDid(esdTrack->GetID());
2245 break;
2246 }
2247 }
2248 }
41702fec 2249
2250 // Reset Track and Candidate Number
2251 AliTRDtrackerDebug::SetCandidateNumber(0);
2252 AliTRDtrackerDebug::SetTrackNumber(0);
b1135f96 2253
2254 // delete ESD tracks in the array
2255 fTracksESD->Delete();
41702fec 2256 return nTracks;
e4f2f73d 2257}
2258
2259//____________________________________________________________________
4d6aee34 2260Int_t AliTRDtrackerV1::Clusters2TracksStack(AliTRDtrackingChamber **stack, TClonesArray * const esdTrackList)
e4f2f73d 2261{
41702fec 2262 //
2263 // Make tracks in one TRD stack.
2264 //
2265 // Parameters :
2266 // layer : Array of stack propagation layers containing clusters
2267 // esdTrackList : Array of ESD tracks found by the stand alone tracker.
2268 // On exit the tracks found in this stack are appended.
2269 //
2270 // Output :
2271 // Number of tracks found in this stack.
2272 //
2273 // Detailed description
2274 //
2275 // 1. Find the 3 most useful seeding chambers. See BuildSeedingConfigs() for details.
2276 // 2. Steer AliTRDtrackerV1::MakeSeeds() for 3 seeding layer configurations.
2277 // See AliTRDtrackerV1::MakeSeeds() for more details.
2278 // 3. Arrange track candidates in decreasing order of their quality
2279 // 4. Classify tracks in 5 categories according to:
2280 // a) number of layers crossed
2281 // b) track quality
2282 // 5. Sign clusters by tracks in decreasing order of track quality
2283 // 6. Build AliTRDtrack out of seeding tracklets
2284 // 7. Cook MC label
2285 // 8. Build ESD track and register it to the output list
2286 //
2287
4d6aee34 2288 AliTRDtrackingChamber *chamber = NULL;
2289 AliTRDtrackingChamber **ci = NULL;
41702fec 2290 AliTRDseedV1 sseed[kMaxTracksStack*6]; // to be initialized
2291 Int_t pars[4]; // MakeSeeds parameters
2292
2293 //Double_t alpha = AliTRDgeometry::GetAlpha();
2294 //Double_t shift = .5 * alpha;
2295 Int_t configs[kNConfigs];
2296
fac58f00 2297 // Purge used clusters from the containers
2298 ci = &stack[0];
2299 for(Int_t ic = kNPlanes; ic--; ci++){
2300 if(!(*ci)) continue;
2301 (*ci)->Update();
2302 }
2303
41702fec 2304 // Build initial seeding configurations
2305 Double_t quality = BuildSeedingConfigs(stack, configs);
9e85cb05 2306 if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 10){
41702fec 2307 AliInfo(Form("Plane config %d %d %d Quality %f"
2308 , configs[0], configs[1], configs[2], quality));
2309 }
d931f2aa 2310
41702fec 2311
2312 // Initialize contors
2313 Int_t ntracks, // number of TRD track candidates
2314 ntracks1, // number of registered TRD tracks/iter
2315 ntracks2 = 0; // number of all registered TRD tracks in stack
2316 fSieveSeeding = 0;
d931f2aa 2317
2318 // Get stack index
fac58f00 2319 Int_t ic = 0; ci = &stack[0];
2320 while(ic<kNPlanes && !(*ci)){ic++; ci++;}
2321 if(!(*ci)) return ntracks2;
2322 Int_t istack = fGeom->GetStack((*ci)->GetDetector());
d931f2aa 2323
41702fec 2324 do{
2325 // Loop over seeding configurations
2326 ntracks = 0; ntracks1 = 0;
0b559d95 2327 for (Int_t iconf = 0; iconf<fkRecoParam->GetNumberOfSeedConfigs(); iconf++) {
41702fec 2328 pars[0] = configs[iconf];
2329 pars[1] = ntracks;
d931f2aa 2330 pars[2] = istack;
41702fec 2331 ntracks = MakeSeeds(stack, &sseed[6*ntracks], pars);
6e39bde4 2332 //AliInfo(Form("Number of Tracks after iteration step %d: %d\n", iconf, ntracks));
41702fec 2333 if(ntracks == kMaxTracksStack) break;
2334 }
980d5a2a 2335 AliDebug(2, Form("Candidate TRD tracks %d in iteration %d.", ntracks, fSieveSeeding));
41702fec 2336 if(!ntracks) break;
2337
2338 // Sort the seeds according to their quality
41f024fb 2339 Int_t sort[kMaxTracksStack+1];
41702fec 2340 TMath::Sort(ntracks, fTrackQuality, sort, kTRUE);
68f9b6bd 2341 if(AliLog::GetDebugLevel("TRD", "AliTRDtrackerV1") > 2){
2342 AliDebug(3, "Track candidates classification:");
2343 for (Int_t it(0); it < ntracks; it++) {
2344 Int_t jt(sort[it]);
2345 printf(" %2d idx[%d] Quality[%e]\n", it, jt, fTrackQuality[jt]);
2346 }
2347 }
41702fec 2348
2349 // Initialize number of tracks so far and logic switches
2350 Int_t ntracks0 = esdTrackList->GetEntriesFast();
2351 Bool_t signedTrack[kMaxTracksStack];
2352 Bool_t fakeTrack[kMaxTracksStack];
2353 for (Int_t i=0; i<ntracks; i++){
2354 signedTrack[i] = kFALSE;
2355 fakeTrack[i] = kFALSE;
2356 }
2357 //AliInfo("Selecting track candidates ...");
2358
2359 // Sieve clusters in decreasing order of track quality
68f9b6bd 2360 Int_t jSieve(0), rejectedCandidates(0);
41702fec 2361 do{
41702fec 2362 // Check track candidates
68f9b6bd 2363 rejectedCandidates=0;
41702fec 2364 for (Int_t itrack = 0; itrack < ntracks; itrack++) {
804bb02e 2365 Int_t trackIndex = sort[itrack];
2366 if (signedTrack[trackIndex] || fakeTrack[trackIndex]) continue;
41702fec 2367
804bb02e 2368 // Calculate track parameters from tracklets seeds
804bb02e 2369 Int_t ncl = 0;
2370 Int_t nused = 0;
2371 Int_t nlayers = 0;
2372 Int_t findable = 0;
2373 for (Int_t jLayer = 0; jLayer < kNPlanes; jLayer++) {
2374 Int_t jseed = kNPlanes*trackIndex+jLayer;
68f9b6bd 2375 sseed[jseed].UpdateUsed();
804bb02e 2376 if(!sseed[jseed].IsOK()) continue;
68f9b6bd 2377 // check if primary candidate
f29f13a6 2378 if (TMath::Abs(sseed[jseed].GetYref(0) / sseed[jseed].GetX0()) < 0.158) findable++;
68f9b6bd 2379 ncl += sseed[jseed].GetN();
804bb02e 2380 nused += sseed[jseed].GetNUsed();
2381 nlayers++;
804bb02e 2382 }
2383
f29f13a6 2384 // Filter duplicated tracks
2385 if (nused > 30){
68f9b6bd 2386 AliDebug(4, Form("REJECTED : %d idx[%d] quality[%e] tracklets[%d] usedClusters[%d]", itrack, trackIndex, fTrackQuality[trackIndex], nlayers, nused));
f29f13a6 2387 fakeTrack[trackIndex] = kTRUE;
2388 continue;
2389 }
5ef88e00 2390 if (ncl>0 && Float_t(nused)/ncl >= .25){
68f9b6bd 2391 AliDebug(4, Form("REJECTED : %d idx[%d] quality[%e] tracklets[%d] usedClusters[%d] used/ncl[%f]", itrack, trackIndex, fTrackQuality[trackIndex], nlayers, nused, Float_t(nused)/ncl));
f29f13a6 2392 fakeTrack[trackIndex] = kTRUE;
2393 continue;
2394 }
41702fec 2395
68f9b6bd 2396 AliDebug(4, Form("Candidate[%d] Quality[%e] Tracklets[%d] Findable[%d] Ncl[%d] Nused[%d]", trackIndex, fTrackQuality[trackIndex], nlayers, findable, ncl, nused));
2397
f29f13a6 2398 // Classify tracks
2399 Bool_t skip = kFALSE;
2400 switch(jSieve){
68f9b6bd 2401 case 0: // select 6 tracklets primary tracks, good quality
2402 if(nlayers > findable || nlayers < kNPlanes) {skip = kTRUE; break;}
f29f13a6 2403 if(TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -5.){skip = kTRUE; break;}
2404 break;
2405
68f9b6bd 2406 case 1: // select shorter primary tracks, good quality
e7542a7e 2407 //if(findable<4){skip = kTRUE; break;}
f29f13a6 2408 if(nlayers < findable){skip = kTRUE; break;}
2409 if(TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -4.){skip = kTRUE; break;}
2410 break;
2411
68f9b6bd 2412 case 2: // select 6 tracklets secondary tracks
2413 if(nlayers < kNPlanes) { skip = kTRUE; break;}
f29f13a6 2414 if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -6.0){skip = kTRUE; break;}
2415 break;
2416
68f9b6bd 2417 case 3: // select shorter tracks, good quality
2418 if (nlayers<4){skip = kTRUE; break;}
f29f13a6 2419 if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -5.){skip = kTRUE; break;}
2420 break;
2421
68f9b6bd 2422 case 4: // select anything with at least 4 tracklets
2423 if (nlayers<4){skip = kTRUE; break;}
f29f13a6 2424 //if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) - nused/(nlayers-3.0) < -15.0){skip = kTRUE; break;}
2425 break;
2426 }
2427 if(skip){
68f9b6bd 2428 rejectedCandidates++;
5ef88e00 2429 AliDebug(4, Form("REJECTED : %d idx[%d] quality[%e] tracklets[%d] usedClusters[%d]", itrack, trackIndex, fTrackQuality[trackIndex], nlayers, nused));
f29f13a6 2430 continue;
5ef88e00 2431 } else AliDebug(4, Form("ACCEPTED : %d idx[%d] quality[%e] tracklets[%d] usedClusters[%d]", itrack, trackIndex, fTrackQuality[trackIndex], nlayers, nused));
2432
f29f13a6 2433 signedTrack[trackIndex] = kTRUE;
2434
68f9b6bd 2435 AliTRDseedV1 *lseed =&sseed[trackIndex*kNPlanes];
2436 AliTRDtrackV1 *track = MakeTrack(lseed);
2437 if(!track){
2438 AliDebug(1, "Track building failed.");
2439 continue;
2440 } else {
2441 if(AliLog::GetDebugLevel("TRD", "AliTRDtrackerV1") > 1){
2442 Int_t ich = 0; while(!(chamber = stack[ich])) ich++;
2443 AliDebug(2, Form("Track pt=%7.2fGeV/c SM[%2d] Done.", track->Pt(), fGeom->GetSector(chamber->GetDetector())));
2444 }
2445 }
f29f13a6 2446
9e85cb05 2447 if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 1 && fkReconstructor->IsDebugStreaming()){
eb2b4f91 2448 //AliInfo(Form("Track %d [%d] nlayers %d trackQuality = %e nused %d, yref = %3.3f", itrack, trackIndex, nlayers, fTrackQuality[trackIndex], nused, trackParams[1]));
f29f13a6 2449
f29f13a6 2450 AliTRDseedV1 *dseed[6];
b82b4de1 2451 for(Int_t iseed = AliTRDgeometry::kNlayer; iseed--;) dseed[iseed] = new AliTRDseedV1(lseed[iseed]);
f29f13a6 2452
2453 //Int_t eventNrInFile = esd->GetEventNumberInFile();
f29f13a6 2454 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2455 Int_t trackNumber = AliTRDtrackerDebug::GetTrackNumber();
2456 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
a2fbb6ec 2457 TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
f29f13a6 2458 cstreamer << "Clusters2TracksStack"
68f9b6bd 2459 << "EventNumber=" << eventNumber
2460 << "TrackNumber=" << trackNumber
2461 << "CandidateNumber=" << candidateNumber
2462 << "Iter=" << fSieveSeeding
2463 << "Like=" << fTrackQuality[trackIndex]
2464 << "S0.=" << dseed[0]
2465 << "S1.=" << dseed[1]
2466 << "S2.=" << dseed[2]
2467 << "S3.=" << dseed[3]
2468 << "S4.=" << dseed[4]
2469 << "S5.=" << dseed[5]
2470 << "Ncl=" << ncl
2471 << "NLayers=" << nlayers
2472 << "Findable=" << findable
2473 << "NUsed=" << nused
f29f13a6 2474 << "\n";
2475 }
d877f55f 2476
68f9b6bd 2477
f29f13a6 2478 AliESDtrack *esdTrack = new ((*esdTrackList)[ntracks0++]) AliESDtrack();
2479 esdTrack->UpdateTrackParams(track, AliESDtrack::kTRDout);
2480 esdTrack->SetLabel(track->GetLabel());
2481 track->UpdateESDtrack(esdTrack);
2482 // write ESD-friends if neccessary
9e85cb05 2483 if (fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 0){
f29f13a6 2484 AliTRDtrackV1 *calibTrack = new AliTRDtrackV1(*track);
2485 calibTrack->SetOwner();
2486 esdTrack->AddCalibObject(calibTrack);
2487 }
2488 ntracks1++;
2489 AliTRDtrackerDebug::SetTrackNumber(AliTRDtrackerDebug::GetTrackNumber() + 1);
41702fec 2490 }
2491
2492 jSieve++;
68f9b6bd 2493 } while(jSieve<5 && rejectedCandidates); // end track candidates sieve
41702fec 2494 if(!ntracks1) break;
2495
2496 // increment counters
2497 ntracks2 += ntracks1;
4302c900 2498
4d6aee34 2499 if(fkReconstructor->IsHLT()) break;
41702fec 2500 fSieveSeeding++;
2501
2502 // Rebuild plane configurations and indices taking only unused clusters into account
2503 quality = BuildSeedingConfigs(stack, configs);
4d6aee34 2504 if(quality < 1.E-7) break; //fkReconstructor->GetRecoParam() ->GetPlaneQualityThreshold()) break;
41702fec 2505
2506 for(Int_t ip = 0; ip < kNPlanes; ip++){
2507 if(!(chamber = stack[ip])) continue;
c79857d5 2508 chamber->Build(fGeom);//Indices(fSieveSeeding);
41702fec 2509 }
2510
9e85cb05 2511 if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 10){
41702fec 2512 AliInfo(Form("Sieve level %d Plane config %d %d %d Quality %f", fSieveSeeding, configs[0], configs[1], configs[2], quality));
2513 }
2514 } while(fSieveSeeding<10); // end stack clusters sieve
2515
2516
2517
2518 //AliInfo(Form("Registered TRD tracks %d in stack %d.", ntracks2, pars[1]));
2519
2520 return ntracks2;
e4f2f73d 2521}
2522
2523//___________________________________________________________________
eb38ed55 2524Double_t AliTRDtrackerV1::BuildSeedingConfigs(AliTRDtrackingChamber **stack, Int_t *configs)
e4f2f73d 2525{
41702fec 2526 //
2527 // Assign probabilities to chambers according to their
2528 // capability of producing seeds.
2529 //
2530 // Parameters :
2531 //
2532 // layers : Array of stack propagation layers for all 6 chambers in one stack
2533 // configs : On exit array of configuration indexes (see GetSeedingConfig()
2534 // for details) in the decreasing order of their seeding probabilities.
2535 //
2536 // Output :
2537 //
2538 // Return top configuration quality
2539 //
2540 // Detailed description:
2541 //
2542 // To each chamber seeding configuration (see GetSeedingConfig() for
2543 // the list of all configurations) one defines 2 quality factors:
2544 // - an apriori topological quality (see GetSeedingConfig() for details) and
2545 // - a data quality based on the uniformity of the distribution of
2546 // clusters over the x range (time bins population). See CookChamberQA() for details.
2547 // The overall chamber quality is given by the product of this 2 contributions.
2548 //
2549
eb2b4f91 2550 Double_t chamberQ[kNPlanes];memset(chamberQ, 0, kNPlanes*sizeof(Double_t));
4d6aee34 2551 AliTRDtrackingChamber *chamber = NULL;
41702fec 2552 for(int iplane=0; iplane<kNPlanes; iplane++){
2553 if(!(chamber = stack[iplane])) continue;
2554 chamberQ[iplane] = (chamber = stack[iplane]) ? chamber->GetQuality() : 0.;
2555 }
2556
eb2b4f91 2557 Double_t tconfig[kNConfigs];memset(tconfig, 0, kNConfigs*sizeof(Double_t));
2558 Int_t planes[] = {0, 0, 0, 0};
41702fec 2559 for(int iconf=0; iconf<kNConfigs; iconf++){
2560 GetSeedingConfig(iconf, planes);
2561 tconfig[iconf] = fgTopologicQA[iconf];
2562 for(int iplane=0; iplane<4; iplane++) tconfig[iconf] *= chamberQ[planes[iplane]];
2563 }
2564
2565 TMath::Sort((Int_t)kNConfigs, tconfig, configs, kTRUE);
0b559d95 2566 // AliInfo(Form("q[%d] = %f", configs[0], tconfig[configs[0]]));
41702fec 2567 // AliInfo(Form("q[%d] = %f", configs[1], tconfig[configs[1]]));
2568 // AliInfo(Form("q[%d] = %f", configs[2], tconfig[configs[2]]));
2569
2570 return tconfig[configs[0]];
e4f2f73d 2571}
2572
2573//____________________________________________________________________
e17f4785 2574Int_t AliTRDtrackerV1::MakeSeeds(AliTRDtrackingChamber **stack, AliTRDseedV1 * const sseed, const Int_t * const ipar)
e4f2f73d 2575{
afa21247 2576//
2a3191bb 2577// Seed tracklets and build candidate TRD tracks. The procedure is used during barrel tracking to account for tracks which are
2578// either missed by TPC prolongation or conversions inside the TRD volume.
2579// For stand alone tracking the procedure is used to estimate all tracks measured by TRD.
afa21247 2580//
2581// Parameters :
2582// layers : Array of stack propagation layers containing clusters
2583// sseed : Array of empty tracklet seeds. On exit they are filled.
2584// ipar : Control parameters:
2585// ipar[0] -> seeding chambers configuration
2586// ipar[1] -> stack index
2587// ipar[2] -> number of track candidates found so far
2588//
2589// Output :
2590// Number of tracks candidates found.
2591//
2592// The following steps are performed:
2593// 1. Build seeding layers by collapsing all time bins from each of the four seeding chambers along the
2594// radial coordinate. See AliTRDtrackingChamber::GetSeedingLayer() for details. The chambers selection for seeding
2595// is described in AliTRDtrackerV1::Clusters2TracksStack().
2596// 2. Using the seeding clusters from the seeding layer (step 1) build combinatorics using the following algorithm:
2597// - for each seeding cluster in the lower seeding layer find
2598// - all seeding clusters in the upper seeding layer inside a road defined by a given phi angle. The angle
2599// is calculated on the minimum pt of tracks from vertex accesible to the stand alone tracker.
2600// - for each pair of two extreme seeding clusters select middle upper cluster using roads defined externally by the
2601// reco params
2602// - select last seeding cluster as the nearest to the linear approximation of the track described by the first three
2603// seeding clusters.
2604// The implementation of road calculation and cluster selection can be found in the functions AliTRDchamberTimeBin::BuildCond()
2605// and AliTRDchamberTimeBin::GetClusters().
2606// 3. Helix fit of the seeding clusters set. (see AliTRDtrackerFitter::FitRieman(AliTRDcluster**)). No tilt correction is
2607// performed at this level
2608// 4. Initialize seeding tracklets in the seeding chambers.
2609// 5. *Filter 0* Chi2 cut on the Y and Z directions. The threshold is set externally by the reco params.
2610// 6. Attach (true) clusters to seeding tracklets (see AliTRDseedV1::AttachClusters()) and fit tracklet (see
2611// AliTRDseedV1::Fit()). The number of used clusters used by current seeds should not exceed ... (25).
2612// 7. *Filter 1* Check if all 4 seeding tracklets are correctly constructed.
2613// 8. Helix fit of the clusters from the seeding tracklets with tilt correction. Refit tracklets using the new
2614// approximation of the track.
2615// 9. *Filter 2* Calculate likelihood of the track. (See AliTRDtrackerV1::CookLikelihood()). The following quantities are
2616// checked against the Riemann fit:
2617// - position resolution in y
2618// - angular resolution in the bending plane
2619// - likelihood of the number of clusters attached to the tracklet
2620// 10. Extrapolation of the helix fit to the other 2 chambers *non seeding* chambers:
2621// - Initialization of extrapolation tracklets with the fit parameters
2622// - Attach clusters to extrapolated tracklets
2623// - Helix fit of tracklets
2624// 11. Improve seeding tracklets quality by reassigning clusters based on the last parameters of the track
2625// See AliTRDtrackerV1::ImproveSeedQuality() for details.
2626// 12. Helix fit of all 6 seeding tracklets and chi2 calculation
2627// 13. Hyperplane fit and track quality calculation. See AliTRDtrackerFitter::FitHyperplane() for details.
2628// 14. Cooking labels for tracklets. Should be done only for MC
2629// 15. Register seeds.
2630//
2631// Authors:
2632// Marian Ivanov <M.Ivanov@gsi.de>
2633// Alexandru Bercuci <A.Bercuci@gsi.de>
2634// Markus Fasel <M.Fasel@gsi.de>
41702fec 2635
4d6aee34 2636 AliTRDtrackingChamber *chamber = NULL;
2637 AliTRDcluster *c[kNSeedPlanes] = {NULL, NULL, NULL, NULL}; // initilize seeding clusters
e17f4785 2638 AliTRDseedV1 *cseed = &sseed[0]; // initialize tracklets for first track
41702fec 2639 Int_t ncl, mcl; // working variable for looping over clusters
2640 Int_t index[AliTRDchamberTimeBin::kMaxClustersLayer], jndex[AliTRDchamberTimeBin::kMaxClustersLayer];
2641 // chi2 storage
2642 // chi2[0] = tracklet chi2 on the Z direction
2643 // chi2[1] = tracklet chi2 on the R direction
2644 Double_t chi2[4];
2645
afa21247 2646 // this should be data member of AliTRDtrack TODO
d2eba04b 2647// Double_t seedQuality[kMaxTracksStack];
41702fec 2648
2649 // unpack control parameters
2650 Int_t config = ipar[0];
2651 Int_t ntracks = ipar[1];
d931f2aa 2652 Int_t istack = ipar[2];
41702fec 2653 Int_t planes[kNSeedPlanes]; GetSeedingConfig(config, planes);
afa21247 2654 Int_t planesExt[kNPlanes-kNSeedPlanes]; GetExtrapolationConfig(config, planesExt);
be24510a 2655
2656
41702fec 2657 // Init chambers geometry
41702fec 2658 Double_t hL[kNPlanes]; // Tilting angle
2659 Float_t padlength[kNPlanes]; // pad lenghts
dd8059a8 2660 Float_t padwidth[kNPlanes]; // pad widths
4d6aee34 2661 AliTRDpadPlane *pp = NULL;
41702fec 2662 for(int iplane=0; iplane<kNPlanes; iplane++){
2663 pp = fGeom->GetPadPlane(iplane, istack);
bb79ccd5 2664 hL[iplane] = TMath::Tan(TMath::DegToRad()*pp->GetTiltingAngle());
41702fec 2665 padlength[iplane] = pp->GetLengthIPad();
dd8059a8 2666 padwidth[iplane] = pp->GetWidthIPad();
41702fec 2667 }
2668
eb2b4f91 2669 // Init anode wire position for chambers
e165b64b 2670 Double_t x0[kNPlanes], // anode wire position
eb2b4f91 2671 driftLength = .5*AliTRDgeometry::AmThick() - AliTRDgeometry::DrThick(); // drift length
4d6aee34 2672 TGeoHMatrix *matrix = NULL;
eb2b4f91 2673 Double_t loc[] = {AliTRDgeometry::AnodePos(), 0., 0.};
2674 Double_t glb[] = {0., 0., 0.};
2675 AliTRDtrackingChamber **cIter = &stack[0];
a3743898 2676 for(int iLayer=0; iLayer<kNPlanes; iLayer++,cIter++){
eb2b4f91 2677 if(!(*cIter)) continue;
e165b64b 2678 if(!(matrix = fGeom->GetClusterMatrix((*cIter)->GetDetector()))){
e165b64b 2679 x0[iLayer] = fgkX0[iLayer];
e7542a7e 2680 continue;
e165b64b 2681 }
eb2b4f91 2682 matrix->LocalToMaster(loc, glb);
2683 x0[iLayer] = glb[0];
2684 }
2685
980d5a2a 2686 AliDebug(2, Form("Making seeds Stack[%d] Config[%d] Tracks[%d]...", istack, config, ntracks));
41702fec 2687
d931f2aa 2688 // Build seeding layers
d611c74f 2689 ResetSeedTB();
41702fec 2690 Int_t nlayers = 0;
41702fec 2691 for(int isl=0; isl<kNSeedPlanes; isl++){
2692 if(!(chamber = stack[planes[isl]])) continue;
4d6aee34 2693 if(!chamber->GetSeedingLayer(fSeedTB[isl], fGeom, fkReconstructor)) continue;
41702fec 2694 nlayers++;
41702fec 2695 }
eb2b4f91 2696 if(nlayers < kNSeedPlanes) return ntracks;
41702fec 2697
2698
2699 // Start finding seeds
2700 Double_t cond0[4], cond1[4], cond2[4];
2701 Int_t icl = 0;
d611c74f 2702 while((c[3] = (*fSeedTB[3])[icl++])){
41702fec 2703 if(!c[3]) continue;
d611c74f 2704 fSeedTB[0]->BuildCond(c[3], cond0, 0);
2705 fSeedTB[0]->GetClusters(cond0, index, ncl);
41702fec 2706 //printf("Found c[3] candidates 0 %d\n", ncl);
2707 Int_t jcl = 0;
2708 while(jcl<ncl) {
d611c74f 2709 c[0] = (*fSeedTB[0])[index[jcl++]];
41702fec 2710 if(!c[0]) continue;
2711 Double_t dx = c[3]->GetX() - c[0]->GetX();
afa21247 2712 Double_t dzdx = (c[3]->GetZ() - c[0]->GetZ())/dx;
2713 Double_t dydx = (c[3]->GetY() - c[0]->GetY())/dx;
2714 fSeedTB[1]->BuildCond(c[0], cond1, 1, dzdx, dydx);
d611c74f 2715 fSeedTB[1]->GetClusters(cond1, jndex, mcl);
41702fec 2716 //printf("Found c[0] candidates 1 %d\n", mcl);
2717
2718 Int_t kcl = 0;
2719 while(kcl<mcl) {
d611c74f 2720 c[1] = (*fSeedTB[1])[jndex[kcl++]];
2721 if(!c[1]) continue;
afa21247 2722 fSeedTB[2]->BuildCond(c[1], cond2, 2, dzdx, dydx);
d611c74f 2723 c[2] = fSeedTB[2]->GetNearestCluster(cond2);
2724 //printf("Found c[1] candidate 2 %p\n", c[2]);
2725 if(!c[2]) continue;
980d5a2a 2726
2727 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].",
2728 c[0]->GetX(), c[0]->GetY(), c[0]->GetZ(),
2729 c[1]->GetX(), c[1]->GetY(), c[1]->GetZ(),
2730 c[2]->GetX(), c[2]->GetY(), c[2]->GetZ(),
2731 c[3]->GetX(), c[3]->GetY(), c[3]->GetZ()));
d611c74f 2732
804bb02e 2733 for (Int_t il = 0; il < kNPlanes; il++) cseed[il].Reset();
41702fec 2734
d611c74f 2735 FitRieman(c, chi2);
2736
d931f2aa 2737 AliTRDseedV1 *tseed = &cseed[0];
bb2db46c 2738 cIter = &stack[0];
2739 for(int iLayer=0; iLayer<kNPlanes; iLayer++, tseed++, cIter++){
2740 Int_t det = (*cIter) ? (*cIter)->GetDetector() : -1;
eb2b4f91 2741 tseed->SetDetector(det);
43d6ad34 2742 tseed->SetTilt(hL[iLayer]);
2743 tseed->SetPadLength(padlength[iLayer]);
dd8059a8 2744 tseed->SetPadWidth(padwidth[iLayer]);
4d6aee34 2745 tseed->SetReconstructor(fkReconstructor);
eb2b4f91 2746 tseed->SetX0(det<0 ? fR[iLayer]+driftLength : x0[iLayer]);
d611c74f 2747 tseed->Init(GetRiemanFitter());
f29f13a6 2748 tseed->SetStandAlone(kTRUE);
d611c74f 2749 }
2750
2751 Bool_t isFake = kFALSE;
9e85cb05 2752 if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) >= 2 && fkReconstructor->IsDebugStreaming()){
d611c74f 2753 if (c[0]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
2754 if (c[1]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
2755 if (c[2]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
2756
2757 Double_t xpos[4];
2758 for(Int_t l = 0; l < kNSeedPlanes; l++) xpos[l] = fSeedTB[l]->GetX();
2759 Float_t yref[4];
2760 for(int il=0; il<4; il++) yref[il] = cseed[planes[il]].GetYref(0);
2761 Int_t ll = c[3]->GetLabel(0);
2762 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2763 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2764 AliRieman *rim = GetRiemanFitter();
a2fbb6ec 2765 TTreeSRedirector &cs0 = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
d611c74f 2766 cs0 << "MakeSeeds0"
2767 <<"EventNumber=" << eventNumber
2768 <<"CandidateNumber=" << candidateNumber
2769 <<"isFake=" << isFake
2770 <<"config=" << config
2771 <<"label=" << ll
2772 <<"chi2z=" << chi2[0]
2773 <<"chi2y=" << chi2[1]
2774 <<"Y2exp=" << cond2[0]
2775 <<"Z2exp=" << cond2[1]
2776 <<"X0=" << xpos[0] //layer[sLayer]->GetX()
2777 <<"X1=" << xpos[1] //layer[sLayer + 1]->GetX()
2778 <<"X2=" << xpos[2] //layer[sLayer + 2]->GetX()
2779 <<"X3=" << xpos[3] //layer[sLayer + 3]->GetX()
2780 <<"yref0=" << yref[0]
2781 <<"yref1=" << yref[1]
2782 <<"yref2=" << yref[2]
2783 <<"yref3=" << yref[3]
2784 <<"c0.=" << c[0]
2785 <<"c1.=" << c[1]
2786 <<"c2.=" << c[2]
2787 <<"c3.=" << c[3]
2788 <<"Seed0.=" << &cseed[planes[0]]
2789 <<"Seed1.=" << &cseed[planes[1]]
2790 <<"Seed2.=" << &cseed[planes[2]]
2791 <<"Seed3.=" << &cseed[planes[3]]
2792 <<"RiemanFitter.=" << rim
2793 <<"\n";
2794 }
9e85cb05 2795 if(chi2[0] > fkRecoParam->GetChi2Z()/*7./(3. - sLayer)*//*iter*/){
980d5a2a 2796 AliDebug(3, Form("Filter on chi2Z [%f].", chi2[0]));
d611c74f 2797 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2798 continue;
2799 }
9e85cb05 2800 if(chi2[1] > fkRecoParam->GetChi2Y()/*1./(3. - sLayer)*//*iter*/){
980d5a2a 2801 AliDebug(3, Form("Filter on chi2Y [%f].", chi2[1]));
d611c74f 2802 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2803 continue;
2804 }
2805 //AliInfo("Passed chi2 filter.");
2806
2807 // try attaching clusters to tracklets
6e39bde4 2808 Int_t mlayers = 0;
980d5a2a 2809 AliTRDcluster *cl = NULL;
be24510a 2810 for(int iLayer=0; iLayer<kNSeedPlanes; iLayer++){
d611c74f 2811 Int_t jLayer = planes[iLayer];
980d5a2a 2812 Int_t nNotInChamber = 0;
f29f13a6 2813 if(!cseed[jLayer].AttachClusters(stack[jLayer], kTRUE)) continue;
980d5a2a 2814 if(/*fkReconstructor->IsHLT()*/kFALSE){
2815 cseed[jLayer].UpdateUsed();
2816 if(!cseed[jLayer].IsOK()) continue;
2817 }else{
2818 cseed[jLayer].Fit();
2819 cseed[jLayer].UpdateUsed();
2820 cseed[jLayer].ResetClusterIter();
2821 while((cl = cseed[jLayer].NextCluster())){
2822 if(!cl->IsInChamber()) nNotInChamber++;
2823 }
2824 //printf("clusters[%d], used[%d], not in chamber[%d]\n", cseed[jLayer].GetN(), cseed[jLayer].GetNUsed(), nNotInChamber);
2825 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
2826 }
d611c74f 2827 mlayers++;
2828 }
be24510a 2829
2830 if(mlayers < kNSeedPlanes){
980d5a2a 2831 AliDebug(2, Form("Found only %d tracklets out of %d. Skip.", mlayers, kNSeedPlanes));
be24510a 2832 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2833 continue;
2834 }
2835
2836 // temporary exit door for the HLT
4d6aee34 2837 if(fkReconstructor->IsHLT()){
be24510a 2838 // attach clusters to extrapolation chambers
2839 for(int iLayer=0; iLayer<kNPlanes-kNSeedPlanes; iLayer++){
2840 Int_t jLayer = planesExt[iLayer];
2841 if(!(chamber = stack[jLayer])) continue;
980d5a2a 2842 if(!cseed[jLayer].AttachClusters(chamber, kTRUE)) continue;
5f1ae1e7 2843 cseed[jLayer].Fit();
be24510a 2844 }
0b559d95 2845 //FitTiltedRiemanConstraint(&cseed[0], GetZ());
4302c900 2846 fTrackQuality[ntracks] = 1.; // dummy value
2847 ntracks++;
218ba867 2848 if(ntracks == kMaxTracksStack) return ntracks;
4302c900 2849 cseed += 6;
2850 continue;
2851 }
2852
be24510a 2853
f29f13a6 2854 // Update Seeds and calculate Likelihood
d611c74f 2855 // fit tracklets and cook likelihood
68f9b6bd 2856 Double_t chi2Vals[4];
2857 chi2Vals[0] = FitTiltedRieman(&cseed[0], kTRUE);
f29f13a6 2858 for(int iLayer=0; iLayer<kNSeedPlanes; iLayer++){
2859 Int_t jLayer = planes[iLayer];
2eb10c34 2860 cseed[jLayer].Fit(1);
f29f13a6 2861 }
91834b8d 2862 Double_t like = CookLikelihood(&cseed[0], planes); // to be checked
d611c74f 2863
9e85cb05 2864 if (TMath::Log(1.E-9 + like) < fkRecoParam->GetTrackLikelihood()){
980d5a2a 2865 AliDebug(3, Form("Filter on likelihood %f[%e].", TMath::Log(1.E-9 + like), like));
d611c74f 2866 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2867 continue;
2868 }
2869 //AliInfo(Form("Passed likelihood %f[%e].", TMath::Log(1.E-9 + like), like));
2870
d2eba04b 2871 // book preliminry results
2872 //seedQuality[ntracks] = like;
d611c74f 2873 fSeedLayer[ntracks] = config;/*sLayer;*/
2874
2875 // attach clusters to the extrapolation seeds
980d5a2a 2876 Int_t elayers(0);
be24510a 2877 for(int iLayer=0; iLayer<kNPlanes-kNSeedPlanes; iLayer++){
2878 Int_t jLayer = planesExt[iLayer];
d611c74f 2879 if(!(chamber = stack[jLayer])) continue;
d611c74f 2880
2881 // fit extrapolated seed
2882 if ((jLayer == 0) && !(cseed[1].IsOK())) continue;
2883 if ((jLayer == 5) && !(cseed[4].IsOK())) continue;
2884 AliTRDseedV1 pseed = cseed[jLayer];
f29f13a6 2885 if(!pseed.AttachClusters(chamber, kTRUE)) continue;
2eb10c34 2886 pseed.Fit(1);
d611c74f 2887 cseed[jLayer] = pseed;
68f9b6bd 2888 chi2Vals[0] = FitTiltedRieman(cseed, kTRUE);
2eb10c34 2889 cseed[jLayer].Fit(1);
980d5a2a 2890 elayers++;
d611c74f 2891 }
2892
2893 // AliInfo("Extrapolation done.");
2894 // Debug Stream containing all the 6 tracklets
9e85cb05 2895 if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) >= 2 && fkReconstructor->IsDebugStreaming()){
a2fbb6ec 2896 TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
d611c74f 2897 TLinearFitter *tiltedRieman = GetTiltedRiemanFitter();
2898 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2899 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2900 cstreamer << "MakeSeeds1"
2901 << "EventNumber=" << eventNumber
2902 << "CandidateNumber=" << candidateNumber
2903 << "S0.=" << &cseed[0]
2904 << "S1.=" << &cseed[1]
2905 << "S2.=" << &cseed[2]
2906 << "S3.=" << &cseed[3]
2907 << "S4.=" << &cseed[4]
2908 << "S5.=" << &cseed[5]
2909 << "FitterT.=" << tiltedRieman
2910 << "\n";
2911 }
2912
9e85cb05 2913 if(fkRecoParam->HasImproveTracklets()){
68f9b6bd 2914 if(!ImproveSeedQuality(stack, cseed, chi2Vals[0])){
980d5a2a 2915 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
68f9b6bd 2916 AliDebug(3, "ImproveSeedQuality() failed.");
980d5a2a 2917 }
d611c74f 2918 }
d611c74f 2919
68f9b6bd 2920 // do track fitting with vertex constraint
2921 if(fkRecoParam->IsVertexConstrained()) chi2Vals[1] = FitTiltedRiemanConstraint(&cseed[0], GetZ());
2922 else chi2Vals[1] = -1.;
2923 chi2Vals[2] = GetChi2Z(&cseed[0]);
2924 chi2Vals[3] = GetChi2Phi(&cseed[0]);
2925
2926 // calculate track quality
2927 fTrackQuality[ntracks] = CalculateTrackLikelihood(&chi2Vals[0]);
fac58f00 2928
9e85cb05 2929 if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) >= 2 && fkReconstructor->IsDebugStreaming()){
a2fbb6ec 2930 TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
d611c74f 2931 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2932 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2933 TLinearFitter *fitterTC = GetTiltedRiemanFitterConstraint();
2934 TLinearFitter *fitterT = GetTiltedRiemanFitter();
91834b8d 2935 Int_t ncls = 0;
2936 for(Int_t iseed = 0; iseed < kNPlanes; iseed++){
2937 ncls += cseed[iseed].IsOK() ? cseed[iseed].GetN2() : 0;
2938 }
d611c74f 2939 cstreamer << "MakeSeeds2"
2940 << "EventNumber=" << eventNumber
2941 << "CandidateNumber=" << candidateNumber
2942 << "Chi2TR=" << chi2Vals[0]
2943 << "Chi2TC=" << chi2Vals[1]
2944 << "Nlayers=" << mlayers
91834b8d 2945 << "NClusters=" << ncls
d611c74f 2946 << "Like=" << like
2947 << "S0.=" << &cseed[0]
2948 << "S1.=" << &cseed[1]
2949 << "S2.=" << &cseed[2]
2950 << "S3.=" << &cseed[3]
2951 << "S4.=" << &cseed[4]
2952 << "S5.=" << &cseed[5]
d611c74f 2953 << "FitterT.=" << fitterT
2954 << "FitterTC.=" << fitterTC
2955 << "\n";
2956 }
68f9b6bd 2957 if(AliLog::GetDebugLevel("TRD", "AliTRDtrackerV1")){
2958 Double_t pt[]={0., 0.};
2959 for(Int_t il(0); il<kNPlanes; il++){
2960 if(!cseed[il].IsOK()) continue;
2961 pt[0] = GetBz()*kB2C/cseed[il].GetC();
2962 pt[1] = GetBz()*kB2C/cseed[il].GetC(1);
2963 break;
2964 }
2965 AliDebug(2, Form("Candidate[%2d] pt[%7.3f %7.3f] Q[%e]\n"
2966 " [0] x[%6.2f] n[%2d] nu[%d] OK[%c]\n"
2967 " [1] x[%6.2f] n[%2d] nu[%d] OK[%c]\n"
2968 " [2] x[%6.2f] n[%2d] nu[%d] OK[%c]\n"
2969 " [3] x[%6.2f] n[%2d] nu[%d] OK[%c]\n"
2970 " [4] x[%6.2f] n[%2d] nu[%d] OK[%c]\n"
2971 " [5] x[%6.2f] n[%2d] nu[%d] OK[%c]"
2972 , ntracks, pt[0], pt[1], fTrackQuality[ntracks]
2973 ,cseed[0].GetX(), cseed[0].GetN(), cseed[0].GetNUsed(), cseed[0].IsOK()?'y':'n'
2974 ,cseed[1].GetX(), cseed[1].GetN(), cseed[1].GetNUsed(), cseed[1].IsOK()?'y':'n'
2975 ,cseed[2].GetX(), cseed[2].GetN(), cseed[2].GetNUsed(), cseed[2].IsOK()?'y':'n'
2976 ,cseed[3].GetX(), cseed[3].GetN(), cseed[3].GetNUsed(), cseed[3].IsOK()?'y':'n'
2977 ,cseed[4].GetX(), cseed[4].GetN(), cseed[4].GetNUsed(), cseed[4].IsOK()?'y':'n'
2978 ,cseed[5].GetX(), cseed[5].GetN(), cseed[5].GetNUsed(), cseed[5].IsOK()?'y':'n'));
2979 }
d611c74f 2980 ntracks++;
2981 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2982 if(ntracks == kMaxTracksStack){
2983 AliWarning(Form("Number of seeds reached maximum allowed (%d) in stack.", kMaxTracksStack));
2984 return ntracks;
2985 }
2986 cseed += 6;
41702fec 2987 }
2988 }
2989 }
41702fec 2990
2991 return ntracks;
e4f2f73d 2992}
2993
2994//_____________________________________________________________________________
68f9b6bd 2995AliTRDtrackV1* AliTRDtrackerV1::MakeTrack(AliTRDseedV1 * const tracklet)
e4f2f73d 2996{
afa21247 2997//
2998// Build a TRD track out of tracklet candidates
2999//
3000// Parameters :
3001// seeds : array of tracklets
3002// params : array of track parameters as they are estimated by stand alone tracker. 7 elements.
3003// [0] - radial position of the track at reference point
3004// [1] - y position of the fit at [0]
3005// [2] - z position of the fit at [0]
3006// [3] - snp of the first tracklet
3007// [4] - tgl of the first tracklet
3008// [5] - curvature of the Riemann fit - 1/pt
3009// [6] - sector rotation angle
3010//
3011// Output :
3012// The TRD track.
3013//
3014// Initialize the TRD track based on the parameters of the fit and a parametric covariance matrix
3015// (diagonal with constant variance terms TODO - correct parameterization)
3016//
3017// In case of HLT just register the tracklets in the tracker and return values of the Riemann fit. For the
3018// offline case perform a full Kalman filter on the already found tracklets (see AliTRDtrackerV1::FollowBackProlongation()
3019// for details). Do also MC label calculation and PID if propagation successfully.
41702fec 3020
0b559d95 3021 if(fkReconstructor->IsHLT()) FitTiltedRiemanConstraint(tracklet, 0);
41702fec 3022 Double_t alpha = AliTRDgeometry::GetAlpha();
3023 Double_t shift = AliTRDgeometry::GetAlpha()/2.0;
41702fec 3024
68f9b6bd 3025 // find first good tracklet
3026 Int_t idx(0); while(idx<kNPlanes && !tracklet[idx].IsOK()) idx++;
3027 if(idx>2){ AliDebug(1, Form("Found suspect track start @ layer idx[%d]\n"
3028 " %c[0] x0[%f] n[%d] nu[%d] OK[%c]\n"
3029 " %c[1] x0[%f] n[%d] nu[%d] OK[%c]\n"
3030 " %c[2] x0[%f] n[%d] nu[%d] OK[%c]\n"
3031 " %c[3] x0[%f] n[%d] nu[%d] OK[%c]\n"
3032 " %c[4] x0[%f] n[%d] nu[%d] OK[%c]\n"
3033 " %c[5] x0[%f] n[%d] nu[%d] OK[%c]"
3034 ,idx
3035 ,idx==0?'*':' ', tracklet[0].GetX0(), tracklet[0].GetN(), tracklet[0].GetNUsed(), tracklet[0].IsOK()?'y':'n'
3036 ,idx==1?'*':' ', tracklet[1].GetX0(), tracklet[1].GetN(), tracklet[1].GetNUsed(), tracklet[1].IsOK()?'y':'n'
3037 ,idx==2?'*':' ', tracklet[2].GetX0(), tracklet[2].GetN(), tracklet[2].GetNUsed(), tracklet[2].IsOK()?'y':'n'
3038 ,idx==3?'*':' ', tracklet[3].GetX0(), tracklet[3].GetN(), tracklet[3].GetNUsed(), tracklet[3].IsOK()?'y':'n'
3039 ,idx==4?'*':' ', tracklet[4].GetX0(), tracklet[4].GetN(), tracklet[4].GetNUsed(), tracklet[4].IsOK()?'y':'n'
3040 ,idx==5?'*':' ', tracklet[5].GetX0(), tracklet[5].GetN(), tracklet[5].GetNUsed(), tracklet[5].IsOK()?'y':'n'));
3041 return NULL;
3042 }
3043
8def512c 3044 Double_t dx(5.);
3045 Double_t x(tracklet[idx].GetX0() - dx);
68f9b6bd 3046 // Build track parameters
3047 Double_t params[] = {
3048 tracklet[idx].GetYref(0) - dx*tracklet[idx].GetYref(1) // y
3049 ,tracklet[idx].GetZref(0) - dx*tracklet[idx].GetZref(1) // z
3050 ,TMath::Sin(TMath::ATan(tracklet[idx].GetYref(1))) // snp
3051 ,tracklet[idx].GetZref(1) / TMath::Sqrt(1. + tracklet[idx].GetYref(1) * tracklet[idx].GetYref(1)) // tgl
8def512c 3052 ,tracklet[idx].GetC(fkReconstructor->IsHLT()?1:0) // curvature -> 1/pt
68f9b6bd 3053 };
3054 Int_t sector(fGeom->GetSector(tracklet[idx].GetDetector()));
3055
3056 Double_t c[15];
afa21247 3057 c[ 0] = 0.2; // s^2_y
3058 c[ 1] = 0.0; c[ 2] = 2.0; // s^2_z
3059 c[ 3] = 0.0; c[ 4] = 0.0; c[ 5] = 0.02; // s^2_snp
3060 c[ 6] = 0.0; c[ 7] = 0.0; c[ 8] = 0.0; c[ 9] = 0.1; // s^2_tgl
68f9b6bd 3061 c[10] = 0.0; c[11] = 0.0; c[12] = 0.0; c[13] = 0.0; c[14] = params[4]*params[4]*0.01; // s^2_1/pt
3062
3063 AliTRDtrackV1 track(tracklet, params, c, x, sector*alpha+shift);
41702fec 3064
4d6aee34 3065 AliTRDseedV1 *ptrTracklet = NULL;
9887cc9f 3066
3067 // skip Kalman filter for HLT
5f1ae1e7 3068 if(/*fkReconstructor->IsHLT()*/kFALSE){
9887cc9f 3069 for (Int_t jLayer = 0; jLayer < AliTRDgeometry::kNlayer; jLayer++) {
3070 track.UnsetTracklet(jLayer);
68f9b6bd 3071 ptrTracklet = &tracklet[jLayer];
9887cc9f 3072 if(!ptrTracklet->IsOK()) continue;
5f1ae1e7 3073 if(TMath::Abs(ptrTracklet->GetYref(1) - ptrTracklet->GetYfit(1)) >= .2) continue; // check this condition with Marian
9887cc9f 3074 ptrTracklet = SetTracklet(ptrTracklet);
f29f13a6 3075 ptrTracklet->UseClusters();
91834b8d 3076 track.SetTracklet(ptrTracklet, fTracklets->GetEntriesFast()-1);
3077 }
d78d7df0 3078 AliTRDtrackV1 *ptrTrack = SetTrack(&track);
799e38d7 3079 ptrTrack->CookPID();
5f1ae1e7 3080 ptrTrack->CookLabel(.9);