removed macro ()moved to other git)
[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);
bda5ad6d 627 if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 1){
628 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
629 TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
630 AliExternalTrackParam param0(t);
631 AliExternalTrackParam param1(t);
632 param1.Update(p, cov);
633 TVectorD vcov(3,cov);
634 TVectorD vpar(3,p);
635 cstreamer << "FollowProlongationInfo"
636 << "EventNumber=" << eventNumber
637 << "iplane="<<iplane
638 << "vcov.="<<&vcov
639 << "vpar.="<<&vpar
640 << "tracklet.=" << tracklet
641 << "param0.=" << &param0
642 << "param1.=" << &param1
643 << "\n";
644 }
ef867f55 645 if (chi2 < 1e+10 && ((AliExternalTrackParam&)t).Update(p, cov)){
646 // Register info to track
647 t.SetNumberOfClusters();
648 t.UpdateChi2(chi2);
41702fec 649 nClustersExpected += tracklet->GetN();
650 }
651 }
652
9e85cb05 653 if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 1){
41702fec 654 Int_t index;
51a23065 655 for(int iplane=0; iplane<AliTRDgeometry::kNlayer; iplane++){
41702fec 656 AliTRDseedV1 *tracklet = GetTracklet(&t, iplane, index);
657 if(!tracklet) continue;
658 t.SetTracklet(tracklet, index);
659 }
660
a2fbb6ec 661 if(fkReconstructor->IsDebugStreaming()){
662 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
663 TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
664 AliTRDtrackV1 track(t);
665 track.SetOwner();
666 cstreamer << "FollowProlongation"
667 << "EventNumber=" << eventNumber
668 << "ncl=" << nClustersExpected
669 << "track.=" << &track
670 << "\n";
671 }
41702fec 672 }
41702fec 673 return nClustersExpected;
0906e73e 674
675}
676
677//_____________________________________________________________________________
678Int_t AliTRDtrackerV1::FollowBackProlongation(AliTRDtrackV1 &t)
679{
afa21247 680// Extrapolates/Build the TRD track in the TOF direction.
681//
682// Parameters
683// t : the TRD track which has to be extrapolated
684//
685// Output
686// number of clusters attached to the track
687//
688// Starting from current radial position of track <t> this function
689// extrapolates the track through the 6 TRD layers. The following steps
690// are being performed for each plane:
691// 1. Propagate track to the entrance of the next chamber:
692// - get chamber limits in the radial direction
693// - check crossing sectors
694// - check track inclination
695// - check track prolongation against boundary conditions (see exclusion boundaries on AliTRDgeometry::IsOnBoundary())
696// 2. Build tracklet (see AliTRDseed::AttachClusters() for details) for this layer if needed. If only
697// Kalman filter is needed and tracklets are already linked to the track this step is skipped.
698// 3. Fit tracklet using the information from the Kalman filter.
699// 4. Propagate and update track at reference radial position of the tracklet.
700// 5. Register tracklet with the tracker and track; update pulls monitoring.
701//
702// Observation
2a3191bb 703// 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:
704// - AliTRDtrackV1::kProlongation : track prolongation failed
705// - AliTRDtrackV1::kPropagation : track prolongation failed
706// - AliTRDtrackV1::kAdjustSector : failed during sector crossing
707// - AliTRDtrackV1::kSnp : too large bending
708// - AliTRDtrackV1::kTrackletInit : fail to initialize tracklet
709// - AliTRDtrackV1::kUpdate : fail to attach clusters or fit the tracklet
710// - AliTRDtrackV1::kUnknown : anything which is not covered before
afa21247 711// 2. By default the status of the track before first TRD update is saved.
712//
713// Debug level 2
714//
715// Author
716// Alexandru Bercuci <A.Bercuci@gsi.de>
717//
41702fec 718
eb2b4f91 719 Int_t n = 0;
720 Double_t driftLength = .5*AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick();
4d6aee34 721 AliTRDtrackingChamber *chamber = NULL;
41702fec 722
9e85cb05 723 Int_t debugLevel = fkReconstructor->IsDebugStreaming() ? fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) : 0;
7c3eecb8 724 TTreeSRedirector *cstreamer = fkReconstructor->IsDebugStreaming() ? fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker) : 0x0;
725
36574ea4 726 Bool_t kStoreIn(kTRUE), // toggel store track params. at TRD entry
68f9b6bd 727 kStandAlone(kFALSE), // toggle tracker awarness of stand alone seeding
728 kUseTRD(fkRecoParam->IsOverPtThreshold(t.Pt()));// use TRD measurment to update Kalman
729
730 Int_t startLayer(0);
4d6aee34 731 AliTRDseedV1 tracklet, *ptrTracklet = NULL;
68f9b6bd 732 // Special case for stand alone tracking
733 // - store all tracklets found by seeding
734 // - start propagation from first tracklet found
181d2c97 735 AliTRDseedV1 *tracklets[kNPlanes];
736 memset(tracklets, 0, sizeof(AliTRDseedV1 *) * kNPlanes);
68f9b6bd 737 for(Int_t ip(kNPlanes); ip--;){
738 if(!(tracklets[ip] = t.GetTracklet(ip))) continue;
181d2c97 739 t.UnsetTracklet(ip);
68f9b6bd 740 if(tracklets[ip]->IsOK()) startLayer=ip;
741 kStandAlone = kTRUE;
0b559d95 742 kUseTRD = kTRUE;
181d2c97 743 }
68f9b6bd 744 AliDebug(4, Form("SA[%c] Start[%d]\n"
745 " [0]idx[%d] traklet[%p]\n"
746 " [1]idx[%d] traklet[%p]\n"
747 " [2]idx[%d] traklet[%p]\n"
748 " [3]idx[%d] traklet[%p]\n"
749 " [4]idx[%d] traklet[%p]\n"
750 " [5]idx[%d] traklet[%p]"
751 , kStandAlone?'y':'n', startLayer
752 , t.GetTrackletIndex(0), (void*)tracklets[0]
753 , t.GetTrackletIndex(1), (void*)tracklets[1]
754 , t.GetTrackletIndex(2), (void*)tracklets[2]
755 , t.GetTrackletIndex(3), (void*)tracklets[3]
756 , t.GetTrackletIndex(4), (void*)tracklets[4]
757 , t.GetTrackletIndex(5), (void*)tracklets[5]));
e3cf3d02 758
053767a4 759 // Loop through the TRD layers
4d6aee34 760 TGeoHMatrix *matrix = NULL;
3e860707 761 Double_t x(0.), y(0.), z(0.);
68f9b6bd 762 for (Int_t ily=startLayer, sm=-1, stk=-1, det=-1; ily < AliTRDgeometry::kNlayer; ily++) {
1bd708e3 763 AliDebug(2, Form("Propagate to x[%d] = %7.2f", ily, fR[ily]));
764
eb2b4f91 765 // rough estimate of the entry point
766 if (!t.GetProlongation(fR[ily], y, z)){
88987d18 767 n=-1;
34b5e42d 768 t.SetErrStat(AliTRDtrackV1::kProlongation);
1bd708e3 769 AliDebug(4, Form("Failed Rough Prolongation to ly[%d] x[%7.2f] y[%7.2f] z[%7.2f]", ily, fR[ily], y, z));
eb2b4f91 770 break;
771 }
41702fec 772
eb2b4f91 773 // find sector / stack / detector
774 sm = t.GetSector();
775 // TODO cross check with y value !
776 stk = fGeom->GetStack(z, ily);
777 det = stk>=0 ? AliTRDgeometry::GetDetector(ily, stk, sm) : -1;
4d6aee34 778 matrix = det>=0 ? fGeom->GetClusterMatrix(det) : NULL;
eb2b4f91 779
780 // check if supermodule/chamber is installed
781 if( !fGeom->GetSMstatus(sm) ||
782 stk<0. ||
783 fGeom->IsHole(ily, stk, sm) ||
784 !matrix ){
1bd708e3 785 AliDebug(4, Form("Missing Geometry ly[%d]. Guess radial position", ily));
eb2b4f91 786 // propagate to the default radial position
952051c5 787 if(fR[ily] > (AliTRDReconstructor::GetMaxStep() + t.GetX()) && !PropagateToX(t, fR[ily], AliTRDReconstructor::GetMaxStep())){
88987d18 788 n=-1;
34b5e42d 789 t.SetErrStat(AliTRDtrackV1::kPropagation);
1bd708e3 790 AliDebug(4, "Failed Propagation [Missing Geometry]");
41702fec 791 break;
792 }
eb2b4f91 793 if(!AdjustSector(&t)){
88987d18 794 n=-1;
34b5e42d 795 t.SetErrStat(AliTRDtrackV1::kAdjustSector);
1bd708e3 796 AliDebug(4, "Failed Adjust Sector [Missing Geometry]");
eb2b4f91 797 break;
798 }
952051c5 799 if(TMath::Abs(t.GetSnp()) > AliTRDReconstructor::GetMaxSnp()){
88987d18 800 n=-1;
34b5e42d 801 t.SetErrStat(AliTRDtrackV1::kSnp);
1bd708e3 802 AliDebug(4, "Failed Max Snp [Missing Geometry]");
eb2b4f91 803 break;
804 }
34b5e42d 805 t.SetErrStat(AliTRDtrackV1::kGeometry, ily);
41702fec 806 continue;
807 }
e3cf3d02 808
eb2b4f91 809 // retrieve rotation matrix for the current chamber
810 Double_t loc[] = {AliTRDgeometry::AnodePos()- driftLength, 0., 0.};
811 Double_t glb[] = {0., 0., 0.};
812 matrix->LocalToMaster(loc, glb);
88987d18 813 AliDebug(3, Form("Propagate to det[%3d] x_anode[%7.2f] (%f %f)", det, glb[0]+driftLength, glb[1], glb[2]));
eb2b4f91 814
815 // Propagate to the radial distance of the current layer
952051c5 816 x = glb[0] - AliTRDReconstructor::GetMaxStep();
817 if(x > (AliTRDReconstructor::GetMaxStep() + t.GetX()) && !PropagateToX(t, x, AliTRDReconstructor::GetMaxStep())){
88987d18 818 n=-1;
34b5e42d 819 t.SetErrStat(AliTRDtrackV1::kPropagation);
88987d18 820 AliDebug(4, Form("Failed Initial Propagation to x[%7.2f]", x));
eb2b4f91 821 break;
822 }
823 if(!AdjustSector(&t)){
88987d18 824 n=-1;
34b5e42d 825 t.SetErrStat(AliTRDtrackV1::kAdjustSector);
1bd708e3 826 AliDebug(4, "Failed Adjust Sector Start");
eb2b4f91 827 break;
828 }
952051c5 829 if(TMath::Abs(t.GetSnp()) > AliTRDReconstructor::GetMaxSnp()) {
88987d18 830 n=-1;
34b5e42d 831 t.SetErrStat(AliTRDtrackV1::kSnp);
952051c5 832 AliDebug(4, Form("Failed Max Snp[%f] MaxSnp[%f]", t.GetSnp(), AliTRDReconstructor::GetMaxSnp()));
eb2b4f91 833 break;
834 }
4d6aee34 835 Bool_t doRecalculate = kFALSE;
eb2b4f91 836 if(sm != t.GetSector()){
837 sm = t.GetSector();
4d6aee34 838 doRecalculate = kTRUE;
eb2b4f91 839 }
840 if(stk != fGeom->GetStack(z, ily)){
841 stk = fGeom->GetStack(z, ily);
4d6aee34 842 doRecalculate = kTRUE;
eb2b4f91 843 }
4d6aee34 844 if(doRecalculate){
eb2b4f91 845 det = AliTRDgeometry::GetDetector(ily, stk, sm);
846 if(!(matrix = fGeom->GetClusterMatrix(det))){
34b5e42d 847 t.SetErrStat(AliTRDtrackV1::kGeometry, ily);
1bd708e3 848 AliDebug(4, Form("Failed Geometry Matrix ly[%d]", ily));
eb2b4f91 849 continue;
850 }
851 matrix->LocalToMaster(loc, glb);
952051c5 852 x = glb[0] - AliTRDReconstructor::GetMaxStep();
eb2b4f91 853 }
854
855 // check if track is well inside fiducial volume
952051c5 856 if (!t.GetProlongation(x+AliTRDReconstructor::GetMaxStep(), y, z)) {
88987d18 857 n=-1;
34b5e42d 858 t.SetErrStat(AliTRDtrackV1::kProlongation);
952051c5 859 AliDebug(4, Form("Failed Prolongation to x[%7.2f] y[%7.2f] z[%7.2f]", x+AliTRDReconstructor::GetMaxStep(), y, z));
eb2b4f91 860 break;
861 }
862 if(fGeom->IsOnBoundary(det, y, z, .5)){
34b5e42d 863 t.SetErrStat(AliTRDtrackV1::kBoundary, ily);
1bd708e3 864 AliDebug(4, "Failed Track on Boundary");
eb2b4f91 865 continue;
866 }
b1957d3c 867
eb2b4f91 868 ptrTracklet = tracklets[ily];
869 if(!ptrTracklet){ // BUILD TRACKLET
1bd708e3 870 AliDebug(3, Form("Building tracklet det[%d]", det));
eb2b4f91 871 // check data in supermodule
872 if(!fTrSec[sm].GetNChambers()){
34b5e42d 873 t.SetErrStat(AliTRDtrackV1::kNoClusters, ily);
88987d18 874 AliDebug(4, "Failed NoClusters");
eb2b4f91 875 continue;
876 }
877 if(fTrSec[sm].GetX(ily) < 1.){
34b5e42d 878 t.SetErrStat(AliTRDtrackV1::kNoClusters, ily);
88987d18 879 AliDebug(4, "Failed NoX");
eb2b4f91 880 continue;
881 }
882
883 // check data in chamber
884 if(!(chamber = fTrSec[sm].GetChamber(stk, ily))){
34b5e42d 885 t.SetErrStat(AliTRDtrackV1::kNoClusters, ily);
88987d18 886 AliDebug(4, "Failed No Detector");
eb2b4f91 887 continue;
888 }
9e85cb05 889 if(chamber->GetNClusters() < fgNTimeBins*fkRecoParam ->GetFindableClusters()){
34b5e42d 890 t.SetErrStat(AliTRDtrackV1::kNoClusters, ily);
88987d18 891 AliDebug(4, "Failed Not Enough Clusters in Detector");
eb2b4f91 892 continue;
893 }
894 // build tracklet
4d8f1bd9 895 tracklet.~AliTRDseedV1();
eb2b4f91 896 ptrTracklet = new(&tracklet) AliTRDseedV1(det);
4d6aee34 897 ptrTracklet->SetReconstructor(fkReconstructor);
eb2b4f91 898 ptrTracklet->SetKink(t.IsKink());
2eb10c34 899 ptrTracklet->SetPrimary(t.IsPrimary());
eb2b4f91 900 ptrTracklet->SetPadPlane(fGeom->GetPadPlane(ily, stk));
901 ptrTracklet->SetX0(glb[0]+driftLength);
4d8f1bd9 902 if(!ptrTracklet->Init(&t)){
88987d18 903 n=-1;
34b5e42d 904 t.SetErrStat(AliTRDtrackV1::kTrackletInit);
1bd708e3 905 AliDebug(4, "Failed Tracklet Init");
eb2b4f91 906 break;
907 }
803dc399 908 // Select attachment base on track to B field sign not only track charge which is buggy
909 // mark kFALSE same sign tracks and kTRUE opposite sign tracks
910 // A.Bercuci 3.11.2011
911 Float_t prod(t.GetBz()*t.Charge());
912 if(!ptrTracklet->AttachClusters(chamber, kTRUE, prod<0.?kTRUE:kFALSE, fEventInFile)){
34b5e42d 913 t.SetErrStat(AliTRDtrackV1::kNoAttach, ily);
7c3eecb8 914 if(debugLevel>3){
915 AliTRDseedV1 trackletCp(*ptrTracklet);
916 UChar_t status(t.GetStatusTRD(ily));
9dcc64cc 917 (*cstreamer) << "FollowBackProlongation4"
7c3eecb8 918 <<"status=" << status
919 <<"tracklet.=" << &trackletCp
920 << "\n";
921 }
1bd708e3 922 AliDebug(4, "Failed Attach Clusters");
eb2b4f91 923 continue;
924 }
88987d18 925 AliDebug(3, Form("Number of Clusters in Tracklet: %d", ptrTracklet->GetN()));
926 if(ptrTracklet->GetN() < fgNTimeBins*fkRecoParam->GetFindableClusters()){
34b5e42d 927 t.SetErrStat(AliTRDtrackV1::kNoClustersTracklet, ily);
7c3eecb8 928 if(debugLevel>3){
929 AliTRDseedV1 trackletCp(*ptrTracklet);
930 UChar_t status(t.GetStatusTRD(ily));
9dcc64cc 931 (*cstreamer) << "FollowBackProlongation4"
7c3eecb8 932 <<"status=" << status
933 <<"tracklet.=" << &trackletCp
934 << "\n";
935 }
88987d18 936 AliDebug(4, "Failed N Clusters Attached");
eb2b4f91 937 continue;
938 }
939 ptrTracklet->UpdateUsed();
0217fcd0 940 } else AliDebug(2, Form("Use external tracklet ly[%d]", ily));
eb2b4f91 941 // propagate track to the radial position of the tracklet
68f9b6bd 942
2eb10c34 943 // fit tracklet
944 // tilt correction options
945 // 0 : no correction
946 // 2 : pseudo tilt correction
9dcc64cc 947 if(!ptrTracklet->FitRobust(t.Charge()>0?kTRUE:kFALSE)){
34b5e42d 948 t.SetErrStat(AliTRDtrackV1::kNoFit, ily);
1bd708e3 949 AliDebug(4, "Failed Tracklet Fit");
eb2b4f91 950 continue;
951 }
952 x = ptrTracklet->GetX(); //GetX0();
952051c5 953 if(x > (AliTRDReconstructor::GetMaxStep() + t.GetX()) && !PropagateToX(t, x, AliTRDReconstructor::GetMaxStep())) {
88987d18 954 n=-1;
34b5e42d 955 t.SetErrStat(AliTRDtrackV1::kPropagation);
1bd708e3 956 AliDebug(4, Form("Failed Propagation to Tracklet x[%7.2f]", x));
eb2b4f91 957 break;
958 }
959 if(!AdjustSector(&t)) {
88987d18 960 n=-1;
34b5e42d 961 t.SetErrStat(AliTRDtrackV1::kAdjustSector);
1bd708e3 962 AliDebug(4, "Failed Adjust Sector");
eb2b4f91 963 break;
41702fec 964 }
952051c5 965 if(TMath::Abs(t.GetSnp()) > AliTRDReconstructor::GetMaxSnp()) {
88987d18 966 n=-1;
34b5e42d 967 t.SetErrStat(AliTRDtrackV1::kSnp);
952051c5 968 AliDebug(4, Form("Failed Max Snp[%f] MaxSnp[%f]", t.GetSnp(), AliTRDReconstructor::GetMaxSnp()));
eb2b4f91 969 break;
970 }
b72f4eaf 971 Double_t cov[3]; ptrTracklet->GetCovAt(x, cov);
972 Double_t p[2] = { ptrTracklet->GetY(), ptrTracklet->GetZ()};
973 Double_t chi2 = ((AliExternalTrackParam)t).GetPredictedChi2(p, cov);
6e39bde4 974 // update Kalman with the TRD measurement
b72f4eaf 975 if(chi2>1e+10){ // TODO
34b5e42d 976 t.SetErrStat(AliTRDtrackV1::kChi2, ily);
7c3eecb8 977 if(debugLevel > 2){
978 UChar_t status(t.GetStatusTRD());
979 AliTRDseedV1 trackletCp(*ptrTracklet);
980 AliTRDtrackV1 trackCp(t);
981 trackCp.SetOwner();
9dcc64cc 982 (*cstreamer) << "FollowBackProlongation3"
7c3eecb8 983 << "status=" << status
984 << "tracklet.=" << &trackletCp
985 << "track.=" << &trackCp
986 << "\n";
987 }
1bd708e3 988 AliDebug(4, Form("Failed Chi2[%f]", chi2));
eb2b4f91 989 continue;
990 }
88987d18 991 // mark track as entering the FIDUCIAL volume of TRD
992 if(kStoreIn){
993 t.SetTrackIn();
994 kStoreIn = kFALSE;
995 }
ef867f55 996 if(kUseTRD){
997 if(!((AliExternalTrackParam&)t).Update(p, cov)) {
88987d18 998 n=-1;
34b5e42d 999 t.SetErrStat(AliTRDtrackV1::kUpdate);
ef867f55 1000 if(debugLevel > 2){
1001 UChar_t status(t.GetStatusTRD());
1002 AliTRDseedV1 trackletCp(*ptrTracklet);
1003 AliTRDtrackV1 trackCp(t);
1004 trackCp.SetOwner();
9dcc64cc 1005 (*cstreamer) << "FollowBackProlongation3"
ef867f55 1006 << "status=" << status
1007 << "tracklet.=" << &trackletCp
1008 << "track.=" << &trackCp
1009 << "\n";
1010 }
1011 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]));
1012 break;
7c3eecb8 1013 }
eb2b4f91 1014 }
68f9b6bd 1015 if(!kStandAlone) ptrTracklet->UseClusters();
b72f4eaf 1016 // fill residuals ?!
1017 AliTracker::FillResiduals(&t, p, cov, ptrTracklet->GetVolumeId());
1018
eb2b4f91 1019
4d8f1bd9 1020 // register tracklet with the tracker and track
803dc399 1021 // Save inside the tracklet the track parameters BEFORE track update.
1022 // Commented out their overwriting AFTER track update
1023 // A.Bercuci 3.11.2011
1024 //ptrTracklet->Update(&t);
eb2b4f91 1025 ptrTracklet = SetTracklet(ptrTracklet);
17896e82 1026 Int_t index(fTracklets->GetEntriesFast()-1);
1027 t.SetTracklet(ptrTracklet, index);
ef867f55 1028 // Register info to track
1029 t.SetNumberOfClusters();
1030 t.UpdateChi2(chi2);
1031
eb2b4f91 1032 n += ptrTracklet->GetN();
17896e82 1033 AliDebug(2, Form("Setting Tracklet[%d] @ Idx[%d]", ily, index));
eb2b4f91 1034
41702fec 1035 // Reset material budget if 2 consecutive gold
eb2b4f91 1036// if(ilayer>0 && t.GetTracklet(ilayer-1) && ptrTracklet->GetN() + t.GetTracklet(ilayer-1)->GetN() > 20) t.SetBudget(2, 0.);
41702fec 1037
1038 // Make backup of the track until is gold
b453ef55 1039 Int_t failed(0);
68f9b6bd 1040 if(!kStandAlone && (failed = t.MakeBackupTrack())) AliDebug(2, Form("Failed backup on cut[%d]", failed));
9e85cb05 1041
053767a4 1042 } // end layers loop
eb2b4f91 1043 //printf("clusters[%d] chi2[%f] x[%f] status[%d ", n, t.GetChi2(), t.GetX(), t.GetStatusTRD());
1044 //for(int i=0; i<6; i++) printf("%d ", t.GetStatusTRD(i)); printf("]\n");
41702fec 1045
9dcc64cc 1046 if(n && debugLevel > 1){
1047 //Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
eb2b4f91 1048 AliTRDtrackV1 track(t);
1049 track.SetOwner();
9dcc64cc 1050 (*cstreamer) << "FollowBackProlongation2"
1051 << "EventNumber=" << fEventInFile
eb2b4f91 1052 << "track.=" << &track
41702fec 1053 << "\n";
1054 }
1055
eb2b4f91 1056 return n;
0906e73e 1057}
1058
eb38ed55 1059//_________________________________________________________________________
4d6aee34 1060Float_t AliTRDtrackerV1::FitRieman(AliTRDseedV1 *tracklets, Double_t *chi2, Int_t *const planes){
41702fec 1061 //
1062 // Fits a Riemann-circle to the given points without tilting pad correction.
1063 // The fit is performed using an instance of the class AliRieman (equations
1064 // and transformations see documentation of this class)
1065 // Afterwards all the tracklets are Updated
1066 //
1067 // Parameters: - Array of tracklets (AliTRDseedV1)
1068 // - Storage for the chi2 values (beginning with direction z)
1069 // - Seeding configuration
1070 // Output: - The curvature
1071 //
1072 AliRieman *fitter = AliTRDtrackerV1::GetRiemanFitter();
1073 fitter->Reset();
1074 Int_t allplanes[] = {0, 1, 2, 3, 4, 5};
1075 Int_t *ppl = &allplanes[0];
1076 Int_t maxLayers = 6;
1077 if(planes){
1078 maxLayers = 4;
1079 ppl = planes;
1080 }
1081 for(Int_t il = 0; il < maxLayers; il++){
1082 if(!tracklets[ppl[il]].IsOK()) continue;
e3cf3d02 1083 fitter->AddPoint(tracklets[ppl[il]].GetX0(), tracklets[ppl[il]].GetYfit(0), tracklets[ppl[il]].GetZfit(0),1,10);
41702fec 1084 }
1085 fitter->Update();
1086 // Set the reference position of the fit and calculate the chi2 values
1087 memset(chi2, 0, sizeof(Double_t) * 2);
1088 for(Int_t il = 0; il < maxLayers; il++){
1089 // Reference positions
1090 tracklets[ppl[il]].Init(fitter);
1091
1092 // chi2
1093 if((!tracklets[ppl[il]].IsOK()) && (!planes)) continue;
1094 chi2[0] += tracklets[ppl[il]].GetChi2Y();
1095 chi2[1] += tracklets[ppl[il]].GetChi2Z();
1096 }
1097 return fitter->GetC();
eb38ed55 1098}
1099
1100//_________________________________________________________________________
1101void AliTRDtrackerV1::FitRieman(AliTRDcluster **seedcl, Double_t chi2[2])
1102{
41702fec 1103 //
1104 // Performs a Riemann helix fit using the seedclusters as spacepoints
1105 // Afterwards the chi2 values are calculated and the seeds are updated
1106 //
1107 // Parameters: - The four seedclusters
1108 // - The tracklet array (AliTRDseedV1)
1109 // - The seeding configuration
1110 // - Chi2 array
1111 //
1112 // debug level 2
1113 //
1114 AliRieman *fitter = AliTRDtrackerV1::GetRiemanFitter();
1115 fitter->Reset();
a3743898 1116 for(Int_t i = 0; i < 4; i++){
a3743898 1117 fitter->AddPoint(seedcl[i]->GetX(), seedcl[i]->GetY(), seedcl[i]->GetZ(), 1., 10.);
1118 }
41702fec 1119 fitter->Update();
1120
1121
1122 // Update the seed and calculated the chi2 value
1123 chi2[0] = 0; chi2[1] = 0;
1124 for(Int_t ipl = 0; ipl < kNSeedPlanes; ipl++){
1125 // chi2
1126 chi2[0] += (seedcl[ipl]->GetZ() - fitter->GetZat(seedcl[ipl]->GetX())) * (seedcl[ipl]->GetZ() - fitter->GetZat(seedcl[ipl]->GetX()));
1127 chi2[1] += (seedcl[ipl]->GetY() - fitter->GetYat(seedcl[ipl]->GetX())) * (seedcl[ipl]->GetY() - fitter->GetYat(seedcl[ipl]->GetX()));
1128 }
eb38ed55 1129}
1130
1131
1132//_________________________________________________________________________
1133Float_t AliTRDtrackerV1::FitTiltedRiemanConstraint(AliTRDseedV1 *tracklets, Double_t zVertex)
1134{
41702fec 1135 //
1136 // Fits a helix to the clusters. Pad tilting is considered. As constraint it is
1137 // assumed that the vertex position is set to 0.
1138 // This method is very usefull for high-pt particles
1139 // Basis for the fit: (x - x0)^2 + (y - y0)^2 - R^2 = 0
1140 // x0, y0: Center of the circle
1141 // Measured y-position: ymeas = y - tan(phiT)(zc - zt)
1142 // zc: center of the pad row
1143 // Equation which has to be fitted (after transformation):
1144 // a + b * u + e * v + 2*(ymeas + tan(phiT)(z - zVertex))*t = 0
1145 // Transformation:
1146 // t = 1/(x^2 + y^2)
1147 // u = 2 * x * t
1148 // v = 2 * x * tan(phiT) * t
1149 // Parameters in the equation:
1150 // a = -1/y0, b = x0/y0, e = dz/dx
1151 //
1152 // The Curvature is calculated by the following equation:
1153 // - curv = a/Sqrt(b^2 + 1) = 1/R
1154 // Parameters: - the 6 tracklets
1155 // - the Vertex constraint
1156 // Output: - the Chi2 value of the track
1157 //
1158 // debug level 5
1159 //
1160
1161 TLinearFitter *fitter = GetTiltedRiemanFitterConstraint();
1162 fitter->StoreData(kTRUE);
1163 fitter->ClearPoints();
4d6aee34 1164 AliTRDcluster *cl = NULL;
41702fec 1165
1166 Float_t x, y, z, w, t, error, tilt;
1167 Double_t uvt[2];
1168 Int_t nPoints = 0;
053767a4 1169 for(Int_t ilr = 0; ilr < AliTRDgeometry::kNlayer; ilr++){
1170 if(!tracklets[ilr].IsOK()) continue;
8d2bec9e 1171 for(Int_t itb = 0; itb < AliTRDseedV1::kNclusters; itb++){
053767a4 1172 if(!tracklets[ilr].IsUsable(itb)) continue;
e7542a7e 1173 if(!(cl = tracklets[ilr].GetClusters(itb))) continue;
1742f24c 1174 if(!cl->IsInChamber()) continue;
41702fec 1175 x = cl->GetX();
1176 y = cl->GetY();
1177 z = cl->GetZ();
053767a4 1178 tilt = tracklets[ilr].GetTilt();
41702fec 1179 // Transformation
1180 t = 1./(x * x + y * y);
1181 uvt[0] = 2. * x * t;
1182 uvt[1] = 2. * x * t * tilt ;
1183 w = 2. * (y + tilt * (z - zVertex)) * t;
78b7d24c 1184 error = 2. * TMath::Sqrt(cl->GetSigmaY2()+tilt*tilt*cl->GetSigmaZ2()) * t;
41702fec 1185 fitter->AddPoint(uvt, w, error);
1186 nPoints++;
1187 }
1188 }
e17f4785 1189 fitter->Eval();
41702fec 1190
1191 // Calculate curvature
1192 Double_t a = fitter->GetParameter(0);
1193 Double_t b = fitter->GetParameter(1);
1194 Double_t curvature = a/TMath::Sqrt(b*b + 1);
1195
ce42378b 1196 Float_t chi2track = 0.0;
1197 if (nPoints > 0) {
1198 chi2track = fitter->GetChisquare()/Double_t(nPoints);
1199 }
41702fec 1200 for(Int_t ip = 0; ip < AliTRDtrackerV1::kNPlanes; ip++)
68f9b6bd 1201 tracklets[ip].SetC(curvature, 1);
1202
1203 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 1204
a2fbb6ec 1205/* if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker()) >= 5){
41702fec 1206 //Linear Model on z-direction
1207 Double_t xref = CalculateReferenceX(tracklets); // Relative to the middle of the stack
1208 Double_t slope = fitter->GetParameter(2);
1209 Double_t zref = slope * xref;
1210 Float_t chi2Z = CalculateChi2Z(tracklets, zref, slope, xref);
1211 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
1212 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
4d6aee34 1213 TTreeSRedirector &treeStreamer = *fkReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
41702fec 1214 treeStreamer << "FitTiltedRiemanConstraint"
1215 << "EventNumber=" << eventNumber
1216 << "CandidateNumber=" << candidateNumber
1217 << "Curvature=" << curvature
1218 << "Chi2Track=" << chi2track
1219 << "Chi2Z=" << chi2Z
1220 << "zref=" << zref
1221 << "\n";
3a039a31 1222 }*/
41702fec 1223 return chi2track;
eb38ed55 1224}
1225
1226//_________________________________________________________________________
1227Float_t AliTRDtrackerV1::FitTiltedRieman(AliTRDseedV1 *tracklets, Bool_t sigError)
1228{
41702fec 1229 //
1230 // Performs a Riemann fit taking tilting pad correction into account
1231 // The equation of a Riemann circle, where the y position is substituted by the
1232 // measured y-position taking pad tilting into account, has to be transformed
1233 // into a 4-dimensional hyperplane equation
1234 // Riemann circle: (x-x0)^2 + (y-y0)^2 -R^2 = 0
1235 // Measured y-Position: ymeas = y - tan(phiT)(zc - zt)
1236 // zc: center of the pad row
1237 // zt: z-position of the track
1238 // The z-position of the track is assumed to be linear dependent on the x-position
1239 // Transformed equation: a + b * u + c * t + d * v + e * w - 2 * (ymeas + tan(phiT) * zc) * t = 0
1240 // Transformation: u = 2 * x * t
1241 // v = 2 * tan(phiT) * t
1242 // w = 2 * tan(phiT) * (x - xref) * t
1243 // t = 1 / (x^2 + ymeas^2)
1244 // Parameters: a = -1/y0
1245 // b = x0/y0
1246 // c = (R^2 -x0^2 - y0^2)/y0
1247 // d = offset
1248 // e = dz/dx
1249 // If the offset respectively the slope in z-position is impossible, the parameters are fixed using
1250 // results from the simple riemann fit. Afterwards the fit is redone.
1251 // The curvature is calculated according to the formula:
1252 // curv = a/(1 + b^2 + c*a) = 1/R
1253 //
1254 // Paramters: - Array of tracklets (connected to the track candidate)
1255 // - Flag selecting the error definition
1256 // Output: - Chi2 values of the track (in Parameter list)
1257 //
1258 TLinearFitter *fitter = GetTiltedRiemanFitter();
1259 fitter->StoreData(kTRUE);
1260 fitter->ClearPoints();
1261 AliTRDLeastSquare zfitter;
4d6aee34 1262 AliTRDcluster *cl = NULL;
41702fec 1263
1264 Double_t xref = CalculateReferenceX(tracklets);
6e39bde4 1265 Double_t x, y, z, t, tilt, dx, w, we, erry, errz;
1266 Double_t uvt[4], sumPolY[5], sumPolZ[3];
1267 memset(sumPolY, 0, sizeof(Double_t) * 5);
1268 memset(sumPolZ, 0, sizeof(Double_t) * 3);
41702fec 1269 Int_t nPoints = 0;
1270 // Containers for Least-square fitter
1271 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1272 if(!tracklets[ipl].IsOK()) continue;
ed15ef4f 1273 tilt = tracklets[ipl].GetTilt();
8d2bec9e 1274 for(Int_t itb = 0; itb < AliTRDseedV1::kNclusters; itb++){
41702fec 1275 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1742f24c 1276 if(!cl->IsInChamber()) continue;
c79857d5 1277 if (!tracklets[ipl].IsUsable(itb)) continue;
41702fec 1278 x = cl->GetX();
1279 y = cl->GetY();
1280 z = cl->GetZ();
41702fec 1281 dx = x - xref;
1282 // Transformation
1283 t = 1./(x*x + y*y);
1284 uvt[0] = 2. * x * t;
1285 uvt[1] = t;
1286 uvt[2] = 2. * tilt * t;
1287 uvt[3] = 2. * tilt * dx * t;
1288 w = 2. * (y + tilt*z) * t;
1289 // error definition changes for the different calls
1290 we = 2. * t;
78b7d24c 1291 we *= sigError ? TMath::Sqrt(cl->GetSigmaY2()+tilt*tilt*cl->GetSigmaZ2()) : 0.2;
41702fec 1292 fitter->AddPoint(uvt, w, we);
1293 zfitter.AddPoint(&x, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
6e39bde4 1294 // adding points for covariance matrix estimation
1295 erry = 1./(TMath::Sqrt(cl->GetSigmaY2()) + 0.1); // 0.1 is a systematic error (due to misalignment and miscalibration)
1296 erry *= erry;
1297 errz = 1./cl->GetSigmaZ2();
1298 for(Int_t ipol = 0; ipol < 5; ipol++){
1299 sumPolY[ipol] += erry;
1300 erry *= x;
1301 if(ipol < 3){
1302 sumPolZ[ipol] += errz;
1303 errz *= x;
1304 }
1305 }
41702fec 1306 nPoints++;
1307 }
1308 }
c08b1cc7 1309 if (fitter->Eval()) return 1.e10;
41702fec 1310 zfitter.Eval();
1311
1312 Double_t offset = fitter->GetParameter(3);
1313 Double_t slope = fitter->GetParameter(4);
1314
1315 // Linear fitter - not possible to make boundaries
1316 // Do not accept non possible z and dzdx combinations
1317 Bool_t acceptablez = kTRUE;
1318 Double_t zref = 0.0;
1319 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
1320 if(!tracklets[iLayer].IsOK()) continue;
1321 zref = offset + slope * (tracklets[iLayer].GetX0() - xref);
e3cf3d02 1322 if (TMath::Abs(tracklets[iLayer].GetZfit(0) - zref) > tracklets[iLayer].GetPadLength() * 0.5 + 1.0)
41702fec 1323 acceptablez = kFALSE;
1324 }
1325 if (!acceptablez) {
1326 Double_t dzmf = zfitter.GetFunctionParameter(1);
1327 Double_t zmf = zfitter.GetFunctionValue(&xref);
1328 fgTiltedRieman->FixParameter(3, zmf);
1329 fgTiltedRieman->FixParameter(4, dzmf);
e17f4785 1330 fitter->Eval();
41702fec 1331 fitter->ReleaseParameter(3);
1332 fitter->ReleaseParameter(4);
1333 offset = fitter->GetParameter(3);
1334 slope = fitter->GetParameter(4);
1335 }
1336
1337 // Calculate Curvarture
1338 Double_t a = fitter->GetParameter(0);
1339 Double_t b = fitter->GetParameter(1);
1340 Double_t c = fitter->GetParameter(2);
1341 Double_t curvature = 1.0 + b*b - c*a;
68f9b6bd 1342 if (curvature > 0.0) curvature = a / TMath::Sqrt(curvature);
41702fec 1343
1344 Double_t chi2track = fitter->GetChisquare()/Double_t(nPoints);
1345
6e39bde4 1346 // Prepare error calculation
1347 TMatrixD covarPolY(3,3);
1348 covarPolY(0,0) = sumPolY[0]; covarPolY(1,1) = sumPolY[2]; covarPolY(2,2) = sumPolY[4];
1349 covarPolY(0,1) = covarPolY(1,0) = sumPolY[1];
1350 covarPolY(0,2) = covarPolY(2,0) = sumPolY[2];
1351 covarPolY(2,1) = covarPolY(1,2) = sumPolY[3];
1352 covarPolY.Invert();
1353 TMatrixD covarPolZ(2,2);
1354 covarPolZ(0,0) = sumPolZ[0]; covarPolZ(1,1) = sumPolZ[2];
1355 covarPolZ(1,0) = covarPolZ(0,1) = sumPolZ[1];
1356 covarPolZ.Invert();
1357
41702fec 1358 // Update the tracklets
d2eba04b 1359 Double_t dy, dz;
6e39bde4 1360 Double_t cov[15];
1361 memset(cov, 0, sizeof(Double_t) * 15);
41702fec 1362 for(Int_t iLayer = 0; iLayer < AliTRDtrackerV1::kNPlanes; iLayer++) {
1363
1364 x = tracklets[iLayer].GetX0();
d2eba04b 1365// x1 = x - xref;
41702fec 1366 y = 0;
1367 z = 0;
1368 dy = 0;
1369 dz = 0;
6e39bde4 1370 memset(cov, 0, sizeof(Double_t) * 3);
1371 TMatrixD transform(3,3);
1372 transform(0,0) = 1;
1373 transform(0,1) = x;
1374 transform(0,2) = x*x;
1375 transform(1,1) = 1;
1376 transform(1,2) = x;
1377 transform(2,2) = 1;
1378 TMatrixD covariance(transform, TMatrixD::kMult, covarPolY);
1379 covariance *= transform.T();
1380 TMatrixD transformZ(2,2);
1381 transformZ(0,0) = transformZ(1,1) = 1;
1382 transformZ(0,1) = x;
1383 TMatrixD covarZ(transformZ, TMatrixD::kMult, covarPolZ);
1384 covarZ *= transformZ.T();
41702fec 1385 // y: R^2 = (x - x0)^2 + (y - y0)^2
1386 // => y = y0 +/- Sqrt(R^2 - (x - x0)^2)
1387 // R = Sqrt() = 1/Curvature
1388 // => y = y0 +/- Sqrt(1/Curvature^2 - (x - x0)^2)
1389 Double_t res = (x * a + b); // = (x - x0)/y0
1390 res *= res;
1391 res = 1.0 - c * a + b * b - res; // = (R^2 - (x - x0)^2)/y0^2
1392 if (res >= 0) {
1393 res = TMath::Sqrt(res);
1394 y = (1.0 - res) / a;
1395 }
6e39bde4 1396 cov[0] = covariance(0,0);
1397 cov[2] = covarZ(0,0);
1398 cov[1] = 0.;
41702fec 1399
1400 // dy: R^2 = (x - x0)^2 + (y - y0)^2
1401 // => y = +/- Sqrt(R^2 - (x - x0)^2) + y0
1402 // => dy/dx = (x - x0)/Sqrt(R^2 - (x - x0)^2)
1403 // Curvature: cr = 1/R = a/Sqrt(1 + b^2 - c*a)
1404 // => dy/dx = (x - x0)/(1/(cr^2) - (x - x0)^2)
1405 Double_t x0 = -b / a;
1406 if (-c * a + b * b + 1 > 0) {
1407 if (1.0/(curvature * curvature) - (x - x0) * (x - x0) > 0.0) {
6e39bde4 1408 Double_t yderiv = (x - x0) / TMath::Sqrt(1.0/(curvature * curvature) - (x - x0) * (x - x0));
1409 if (a < 0) yderiv *= -1.0;
1410 dy = yderiv;
41702fec 1411 }
1412 }
1413 z = offset + slope * (x - xref);
1414 dz = slope;
1415 tracklets[iLayer].SetYref(0, y);
1416 tracklets[iLayer].SetYref(1, dy);
1417 tracklets[iLayer].SetZref(0, z);
1418 tracklets[iLayer].SetZref(1, dz);
1419 tracklets[iLayer].SetC(curvature);
6e39bde4 1420 tracklets[iLayer].SetCovRef(cov);
41702fec 1421 tracklets[iLayer].SetChi2(chi2track);
1422 }
68f9b6bd 1423 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 1424
a2fbb6ec 1425/* if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) >=5){
1426 TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
41702fec 1427 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
1428 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
1429 Double_t chi2z = CalculateChi2Z(tracklets, offset, slope, xref);
1430 cstreamer << "FitTiltedRieman0"
1431 << "EventNumber=" << eventNumber
1432 << "CandidateNumber=" << candidateNumber
1433 << "xref=" << xref
1434 << "Chi2Z=" << chi2z
1435 << "\n";
3a039a31 1436 }*/
41702fec 1437 return chi2track;
eb38ed55 1438}
1439
3b57a3f7 1440
9e333711 1441//____________________________________________________________________
6e4d4425 1442Double_t AliTRDtrackerV1::FitLine(const AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t err, Int_t np, AliTrackPoint *points)
9e333711 1443{
4d6aee34 1444 //
1445 // Fit track with a staight line
1446 // Fills an AliTrackPoint array with np points
1447 // Function should be used to refit tracks when no magnetic field was on
1448 //
9e333711 1449 AliTRDLeastSquare yfitter, zfitter;
4d6aee34 1450 AliTRDcluster *cl = NULL;
9e333711 1451
4d6aee34 1452 AliTRDseedV1 work[kNPlanes], *tracklet = NULL;
9e333711 1453 if(!tracklets){
1454 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1455 if(!(tracklet = track->GetTracklet(ipl))) continue;
1456 if(!tracklet->IsOK()) continue;
1457 new(&work[ipl]) AliTRDseedV1(*tracklet);
1458 }
1459 tracklets = &work[0];
1460 }
1461
1462 Double_t xref = CalculateReferenceX(tracklets);
1463 Double_t x, y, z, dx, ye, yr, tilt;
1464 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1465 if(!tracklets[ipl].IsOK()) continue;
1466 for(Int_t itb = 0; itb < fgNTimeBins; itb++){
1467 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1468 if (!tracklets[ipl].IsUsable(itb)) continue;
1469 x = cl->GetX();
1470 z = cl->GetZ();
1471 dx = x - xref;
1472 zfitter.AddPoint(&dx, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
1473 }
1474 }
1475 zfitter.Eval();
1476 Double_t z0 = zfitter.GetFunctionParameter(0);
1477 Double_t dzdx = zfitter.GetFunctionParameter(1);
1478 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1479 if(!tracklets[ipl].IsOK()) continue;
1480 for(Int_t itb = 0; itb < fgNTimeBins; itb++){
1481 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1482 if (!tracklets[ipl].IsUsable(itb)) continue;
1483 x = cl->GetX();
1484 y = cl->GetY();
1485 z = cl->GetZ();
1486 tilt = tracklets[ipl].GetTilt();
1487 dx = x - xref;
1488 yr = y + tilt*(z - z0 - dzdx*dx);
1489 // error definition changes for the different calls
1490 ye = tilt*TMath::Sqrt(cl->GetSigmaZ2());
1491 ye += err ? tracklets[ipl].GetSigmaY() : 0.2;
1492 yfitter.AddPoint(&dx, yr, ye);
1493 }
1494 }
1495 yfitter.Eval();
1496 Double_t y0 = yfitter.GetFunctionParameter(0);
1497 Double_t dydx = yfitter.GetFunctionParameter(1);
1498 Double_t chi2 = 0.;//yfitter.GetChisquare()/Double_t(nPoints);
1499
1500 //update track points array
1501 if(np && points){
1502 Float_t xyz[3];
1503 for(int ip=0; ip<np; ip++){
1504 points[ip].GetXYZ(xyz);
1505 xyz[1] = y0 + dydx * (xyz[0] - xref);
1506 xyz[2] = z0 + dzdx * (xyz[0] - xref);
1507 points[ip].SetXYZ(xyz);
1508 }
1509 }
1510 return chi2;
1511}
1512
1513
3b57a3f7 1514//_________________________________________________________________________
6e4d4425 1515Double_t AliTRDtrackerV1::FitRiemanTilt(const AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t sigError, Int_t np, AliTrackPoint *points)
3b57a3f7 1516{
0fa1a8ee 1517//
1518// Performs a Riemann fit taking tilting pad correction into account
1519//
1520// Paramters: - Array of tracklets (connected to the track candidate)
1521// - Flag selecting the error definition
1522// Output: - Chi2 values of the track (in Parameter list)
1523//
1524// The equations which has to be solved simultaneously are:
1525// BEGIN_LATEX
1526// R^{2} = (x-x_{0})^{2} + (y^{*}-y_{0})^{2}
1527// y^{*} = y - tg(h)(z - z_{t})
1528// z_{t} = z_{0}+dzdx*(x-x_{r})
1529// END_LATEX
1530// with (x, y, z) the coordinate of the cluster, (x_0, y_0, z_0) the coordinate of the center of the Riemann circle,
1531// R its radius, x_r a constant refrence radial position in the middle of the TRD stack and dzdx the slope of the
1532// track in the x-z plane. Using the following transformations
1533// BEGIN_LATEX
1534// t = 1 / (x^{2} + y^{2})
1535// u = 2 * x * t
1536// v = 2 * tan(h) * t
1537// w = 2 * tan(h) * (x - x_{r}) * t
1538// END_LATEX
1539// One gets the following linear equation
1540// BEGIN_LATEX
1541// a + b * u + c * t + d * v + e * w = 2 * (y + tg(h) * z) * t
1542// END_LATEX
1543// where the coefficients have the following meaning
1544// BEGIN_LATEX
1545// a = -1/y_{0}
1546// b = x_{0}/y_{0}
1547// c = (R^{2} -x_{0}^{2} - y_{0}^{2})/y_{0}
1548// d = z_{0}
1549// e = dz/dx
1550// END_LATEX
1551// The error calculation for the free term is thus
1552// BEGIN_LATEX
1553// #sigma = 2 * #sqrt{#sigma^{2}_{y} + (tilt corr ...) + tg^{2}(h) * #sigma^{2}_{z}} * t
1554// END_LATEX
1555//
1556// From this simple model one can compute chi^2 estimates and a rough approximation of pt from the curvature according
1557// to the formula:
1558// BEGIN_LATEX
1559// C = 1/R = a/(1 + b^{2} + c*a)
1560// END_LATEX
1561//
1562// Authors
1563// M.Ivanov <M.Ivanov@gsi.de>
1564// A.Bercuci <A.Bercuci@gsi.de>
1565// M.Fasel <M.Fasel@gsi.de>
1566
41702fec 1567 TLinearFitter *fitter = GetTiltedRiemanFitter();
1568 fitter->StoreData(kTRUE);
1569 fitter->ClearPoints();
1570 AliTRDLeastSquare zfitter;
4d6aee34 1571 AliTRDcluster *cl = NULL;
3b57a3f7 1572
4d6aee34 1573 AliTRDseedV1 work[kNPlanes], *tracklet = NULL;
3b57a3f7 1574 if(!tracklets){
1575 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1576 if(!(tracklet = track->GetTracklet(ipl))) continue;
1577 if(!tracklet->IsOK()) continue;
1578 new(&work[ipl]) AliTRDseedV1(*tracklet);
1579 }
1580 tracklets = &work[0];
1581 }
1582
41702fec 1583 Double_t xref = CalculateReferenceX(tracklets);
68f9b6bd 1584 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 1585 Double_t x, y, z, t, tilt, dx, w, we;
1586 Double_t uvt[4];
1587 Int_t nPoints = 0;
1588 // Containers for Least-square fitter
1589 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1590 if(!tracklets[ipl].IsOK()) continue;
8d2bec9e 1591 for(Int_t itb = 0; itb < AliTRDseedV1::kNclusters; itb++){
41702fec 1592 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
352cef8f 1593 //if (!tracklets[ipl].IsUsable(itb)) continue;
41702fec 1594 x = cl->GetX();
1595 y = cl->GetY();
1596 z = cl->GetZ();
1597 tilt = tracklets[ipl].GetTilt();
1598 dx = x - xref;
1599 // Transformation
1600 t = 1./(x*x + y*y);
1601 uvt[0] = 2. * x * t;
1602 uvt[1] = t;
1603 uvt[2] = 2. * tilt * t;
1604 uvt[3] = 2. * tilt * dx * t;
1605 w = 2. * (y + tilt*z) * t;
1606 // error definition changes for the different calls
1607 we = 2. * t;
f29f13a6 1608 we *= sigError ? TMath::Sqrt(cl->GetSigmaY2()) : 0.2;
41702fec 1609 fitter->AddPoint(uvt, w, we);
1610 zfitter.AddPoint(&x, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
1611 nPoints++;
1612 }
1613 }
aec26713 1614 if(fitter->Eval()) return 1.E10;
1615
41702fec 1616 Double_t z0 = fitter->GetParameter(3);
1617 Double_t dzdx = fitter->GetParameter(4);
3b57a3f7 1618
1619
1620 // Linear fitter - not possible to make boundaries
1621 // Do not accept non possible z and dzdx combinations
1622 Bool_t accept = kTRUE;
1623 Double_t zref = 0.0;
1624 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
1625 if(!tracklets[iLayer].IsOK()) continue;
1626 zref = z0 + dzdx * (tracklets[iLayer].GetX0() - xref);
e3cf3d02 1627 if (TMath::Abs(tracklets[iLayer].GetZfit(0) - zref) > tracklets[iLayer].GetPadLength() * 0.5 + 1.0)
3b57a3f7 1628 accept = kFALSE;
1629 }
1630 if (!accept) {
41702fec 1631 zfitter.Eval();
3b57a3f7 1632 Double_t dzmf = zfitter.GetFunctionParameter(1);
1633 Double_t zmf = zfitter.GetFunctionValue(&xref);
1634 fitter->FixParameter(3, zmf);
1635 fitter->FixParameter(4, dzmf);
e17f4785 1636 fitter->Eval();
3b57a3f7 1637 fitter->ReleaseParameter(3);
1638 fitter->ReleaseParameter(4);
1639 z0 = fitter->GetParameter(3); // = zmf ?
1640 dzdx = fitter->GetParameter(4); // = dzmf ?
1641 }
1642
1643 // Calculate Curvature
1644 Double_t a = fitter->GetParameter(0);
1645 Double_t b = fitter->GetParameter(1);
1646 Double_t c = fitter->GetParameter(2);
1647 Double_t y0 = 1. / a;
1648 Double_t x0 = -b * y0;
a015e406 1649 Double_t tmp = y0*y0 + x0*x0 - c*y0;
1650 if(tmp<=0.) return 1.E10;
4d6aee34 1651 Double_t radius = TMath::Sqrt(tmp);
1652 Double_t curvature = 1.0 + b*b - c*a;
1653 if (curvature > 0.0) curvature = a / TMath::Sqrt(curvature);
3b57a3f7 1654
1655 // Calculate chi2 of the fit
1656 Double_t chi2 = fitter->GetChisquare()/Double_t(nPoints);
68f9b6bd 1657 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 1658
1659 // Update the tracklets
1660 if(!track){
1661 for(Int_t ip = 0; ip < kNPlanes; ip++) {
1662 x = tracklets[ip].GetX0();
4d6aee34 1663 tmp = radius*radius-(x-x0)*(x-x0);
a015e406 1664 if(tmp <= 0.) continue;
1665 tmp = TMath::Sqrt(tmp);
3b57a3f7 1666
1667 // y: R^2 = (x - x0)^2 + (y - y0)^2
1668 // => y = y0 +/- Sqrt(R^2 - (x - x0)^2)
1669 tracklets[ip].SetYref(0, y0 - (y0>0.?1.:-1)*tmp);
1670 // => dy/dx = (x - x0)/Sqrt(R^2 - (x - x0)^2)
1671 tracklets[ip].SetYref(1, (x - x0) / tmp);
1672 tracklets[ip].SetZref(0, z0 + dzdx * (x - xref));
1673 tracklets[ip].SetZref(1, dzdx);
4d6aee34 1674 tracklets[ip].SetC(curvature);
3b57a3f7 1675 tracklets[ip].SetChi2(chi2);
1676 }
1677 }
3b57a3f7 1678 //update track points array
1679 if(np && points){
1680 Float_t xyz[3];
1681 for(int ip=0; ip<np; ip++){
1682 points[ip].GetXYZ(xyz);
4d6aee34 1683 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 1684 xyz[2] = z0 + dzdx * (xyz[0] - xref);
1685 points[ip].SetXYZ(xyz);
1686 }
1687 }
1688
3b57a3f7 1689 return chi2;
1690}
1691
1692
1bf51039 1693//____________________________________________________________________
e17f4785 1694Double_t AliTRDtrackerV1::FitKalman(AliTRDtrackV1 *track, AliTRDseedV1 * const tracklets, Bool_t up, Int_t np, AliTrackPoint *points)
1bf51039 1695{
1696// Kalman filter implementation for the TRD.
1697// It returns the positions of the fit in the array "points"
1698//
1699// Author : A.Bercuci@gsi.de
1700
3cfaffa4 1701 // printf("Start track @ x[%f]\n", track->GetX());
1bf51039 1702
1703 //prepare marker points along the track
1704 Int_t ip = np ? 0 : 1;
1705 while(ip<np){
1706 if((up?-1:1) * (track->GetX() - points[ip].GetX()) > 0.) break;
1707 //printf("AliTRDtrackerV1::FitKalman() : Skip track marker x[%d] = %7.3f. Before track start ( %7.3f ).\n", ip, points[ip].GetX(), track->GetX());
1708 ip++;
1709 }
1710 //if(points) printf("First marker point @ x[%d] = %f\n", ip, points[ip].GetX());
1711
1712
d8069611 1713 AliTRDseedV1 tracklet;
1714 AliTRDseedV1 *ptrTracklet = NULL;
1bf51039 1715
1716 //Loop through the TRD planes
1717 for (Int_t jplane = 0; jplane < kNPlanes; jplane++) {
1718 // GET TRACKLET OR BUILT IT
1719 Int_t iplane = up ? jplane : kNPlanes - 1 - jplane;
1720 if(tracklets){
e17f4785 1721 if(!(ptrTracklet = &tracklets[iplane])) continue;
1bf51039 1722 }else{
1723 if(!(ptrTracklet = track->GetTracklet(iplane))){
4d6aee34 1724 /*AliTRDtrackerV1 *tracker = NULL;
a2fbb6ec 1725 if(!(tracker = dynamic_cast<AliTRDtrackerV1*>( AliTRDrecoParam:Tracker()))) continue;
1bf51039 1726 ptrTracklet = new(&tracklet) AliTRDseedV1(iplane);
1727 if(!tracker->MakeTracklet(ptrTracklet, track)) */
1728 continue;
1729 }
1730 }
1731 if(!ptrTracklet->IsOK()) continue;
1732
1733 Double_t x = ptrTracklet->GetX0();
1734
1735 while(ip < np){
1736 //don't do anything if next marker is after next update point.
952051c5 1737 if((up?-1:1) * (points[ip].GetX() - x) - AliTRDReconstructor::GetMaxStep() < 0) break;
1738 if(((up?-1:1) * (points[ip].GetX() - track->GetX()) < 0) && !PropagateToX(*track, points[ip].GetX(), AliTRDReconstructor::GetMaxStep())) return -1.;
1bf51039 1739
1740 Double_t xyz[3]; // should also get the covariance
3cfaffa4 1741 track->GetXYZ(xyz);
1742 track->Global2LocalPosition(xyz, track->GetAlpha());
1743 points[ip].SetXYZ(xyz[0], xyz[1], xyz[2]);
1bf51039 1744 ip++;
1745 }
3cfaffa4 1746 // printf("plane[%d] tracklet[%p] x[%f]\n", iplane, ptrTracklet, x);
1bf51039 1747
3cfaffa4 1748 // Propagate closer to the next update point
952051c5 1749 if(((up?-1:1) * (x - track->GetX()) + AliTRDReconstructor::GetMaxStep() < 0) && !PropagateToX(*track, x + (up?-1:1)*AliTRDReconstructor::GetMaxStep(), AliTRDReconstructor::GetMaxStep())) return -1.;
1bf51039 1750
1751 if(!AdjustSector(track)) return -1;
952051c5 1752 if(TMath::Abs(track->GetSnp()) > AliTRDReconstructor::GetMaxSnp()) return -1;
1bf51039 1753
1754 //load tracklet to the tracker and the track
1755/* Int_t index;
1756 if((index = FindTracklet(ptrTracklet)) < 0){
1757 ptrTracklet = SetTracklet(&tracklet);
1758 index = fTracklets->GetEntriesFast()-1;
1759 }
1760 track->SetTracklet(ptrTracklet, index);*/
1761
1762
1763 // register tracklet to track with tracklet creation !!
1764 // PropagateBack : loaded tracklet to the tracker and update index
1765 // RefitInward : update index
1766 // MakeTrack : loaded tracklet to the tracker and update index
1767 if(!tracklets) track->SetTracklet(ptrTracklet, -1);
1768
1769
1770 //Calculate the mean material budget along the path inside the chamber
1771 Double_t xyz0[3]; track->GetXYZ(xyz0);
1772 Double_t alpha = track->GetAlpha();
1773 Double_t xyz1[3], y, z;
1774 if(!track->GetProlongation(x, y, z)) return -1;
1775 xyz1[0] = x * TMath::Cos(alpha) - y * TMath::Sin(alpha);
1776 xyz1[1] = +x * TMath::Sin(alpha) + y * TMath::Cos(alpha);
1777 xyz1[2] = z;
fbe11be7 1778 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 1779 Double_t param[7];
3cfaffa4 1780 if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param) <=0.) break;
1bf51039 1781 Double_t xrho = param[0]*param[4]; // density*length
1782 Double_t xx0 = param[1]; // radiation length
1783
1784 //Propagate the track
1785 track->PropagateTo(x, xx0, xrho);
1786 if (!AdjustSector(track)) break;
1787
1788 //Update track
b72f4eaf 1789 Double_t cov[3]; ptrTracklet->GetCovAt(x, cov);
1790 Double_t p[2] = { ptrTracklet->GetY(), ptrTracklet->GetZ()};
1791 Double_t chi2 = ((AliExternalTrackParam*)track)->GetPredictedChi2(p, cov);
ef867f55 1792 if(chi2<1e+10) ((AliExternalTrackParam*)track)->Update(p, cov);
1bf51039 1793 if(!up) continue;
1794
1795 //Reset material budget if 2 consecutive gold
1796 if(iplane>0 && track->GetTracklet(iplane-1) && ptrTracklet->GetN() + track->GetTracklet(iplane-1)->GetN() > 20) track->SetBudget(2, 0.);
1797 } // end planes loop
1798
1799 // extrapolation
1800 while(ip < np){
952051c5 1801 if(((up?-1:1) * (points[ip].GetX() - track->GetX()) < 0) && !PropagateToX(*track, points[ip].GetX(), AliTRDReconstructor::GetMaxStep())) return -1.;
1bf51039 1802
1803 Double_t xyz[3]; // should also get the covariance
3cfaffa4 1804 track->GetXYZ(xyz);
1805 track->Global2LocalPosition(xyz, track->GetAlpha());
1806 points[ip].SetXYZ(xyz[0], xyz[1], xyz[2]);
1bf51039 1807 ip++;
1808 }
1809
1810 return track->GetChi2();
1811}
3b57a3f7 1812
eb38ed55 1813//_________________________________________________________________________
d8069611 1814Float_t AliTRDtrackerV1::CalculateChi2Z(const AliTRDseedV1 *tracklets, Double_t offset, Double_t slope, Double_t xref)
eb38ed55 1815{
41702fec 1816 //
1817 // Calculates the chi2-value of the track in z-Direction including tilting pad correction.
1818 // A linear dependence on the x-value serves as a model.
1819 // The parameters are related to the tilted Riemann fit.
1820 // Parameters: - Array of tracklets (AliTRDseedV1) related to the track candidate
1821 // - the offset for the reference x
1822 // - the slope
1823 // - the reference x position
1824 // Output: - The Chi2 value of the track in z-Direction
1825 //
1826 Float_t chi2Z = 0, nLayers = 0;
053767a4 1827 for (Int_t iLayer = 0; iLayer < AliTRDgeometry::kNlayer; iLayer++) {
41702fec 1828 if(!tracklets[iLayer].IsOK()) continue;
1829 Double_t z = offset + slope * (tracklets[iLayer].GetX0() - xref);
e3cf3d02 1830 chi2Z += TMath::Abs(tracklets[iLayer].GetZfit(0) - z);
41702fec 1831 nLayers++;
1832 }
1833 chi2Z /= TMath::Max((nLayers - 3.0),1.0);
1834 return chi2Z;
eb38ed55 1835}
1836
bccda319 1837//_____________________________________________________________________________
1838Int_t AliTRDtrackerV1::PropagateToX(AliTRDtrackV1 &t, Double_t xToGo, Double_t maxStep)
1839{
41702fec 1840 //
1841 // Starting from current X-position of track <t> this function
1842 // extrapolates the track up to radial position <xToGo>.
1843 // Returns 1 if track reaches the plane, and 0 otherwise
1844 //
bccda319 1845
41702fec 1846 // Current track X-position
15a2657d 1847 Double_t xpos = t.GetX()/*,
1848 mass = t.GetMass()*/;
bccda319 1849
41702fec 1850 // Direction: inward or outward
1851 Double_t dir = (xpos < xToGo) ? 1.0 : -1.0;
bccda319 1852
952051c5 1853 while (((xToGo - xpos) * dir) > AliTRDReconstructor::GetEpsilon()) {
2f4384e6 1854// printf("to go %f\n", (xToGo - xpos) * dir);
41702fec 1855 Double_t xyz0[3];
1856 Double_t xyz1[3];
1857 Double_t param[7];
1858 Double_t x;
1859 Double_t y;
1860 Double_t z;
bccda319 1861
41702fec 1862 // The next step size
1863 Double_t step = dir * TMath::Min(TMath::Abs(xToGo-xpos),maxStep);
bccda319 1864
41702fec 1865 // Get the global position of the starting point
1866 t.GetXYZ(xyz0);
bccda319 1867
41702fec 1868 // X-position after next step
1869 x = xpos + step;
bccda319 1870
41702fec 1871 // Get local Y and Z at the X-position of the next step
3352b455 1872 if(t.GetProlongation(x,y,z)<0) return 0; // No prolongation possible
bccda319 1873
41702fec 1874 // The global position of the end point of this prolongation step
1875 xyz1[0] = x * TMath::Cos(t.GetAlpha()) - y * TMath::Sin(t.GetAlpha());
1876 xyz1[1] = +x * TMath::Sin(t.GetAlpha()) + y * TMath::Cos(t.GetAlpha());
1877 xyz1[2] = z;
bccda319 1878
41702fec 1879 // Calculate the mean material budget between start and
1880 // end point of this prolongation step
83dea92e 1881 if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param)<=0.) return 0;
2f4384e6 1882
41702fec 1883 // Propagate the track to the X-position after the next step
9c87a076 1884 if (!t.PropagateTo(x, param[1], param[0]*param[4])) return 0;
bccda319 1885
15a2657d 1886/* // Correct for mean material budget
2f4384e6 1887 Double_t dEdx(0.),
1d26da6d 1888 bg(TMath::Abs(t.GetP()/mass));
2f4384e6 1889 if(AliLog::GetDebugLevel("TRD", "AliTRDtrackerV1")>=3){
1890 const char *pn[] = {"rho", "x/X0", "<A>", "<Z>", "L", "<Z/A>", "Nb"};
1891 printf("D-AliTRDtrackerV1::PropagateTo(): x[%6.2f] bg[%6.2f]\n", xpos, bg);
1892 printf(" param :: %s[%e] %s[%e] %s[%e] %s[%e] %s[%e] %s[%e] %s[%e]\n"
1893 , pn[0], param[0]
1894 , pn[1], param[1]
1895 , pn[2], param[2]
1896 , pn[3], param[3]
1897 , pn[4], param[4]
1898 , pn[5], param[5]
1899 , pn[6], param[6]);
1900 }
1901 switch(fgBB){
1902 case kSolid:
1903 dEdx = AliExternalTrackParam::BetheBlochSolid(bg);
1904 break;
1905 case kGas:
1906 dEdx = AliExternalTrackParam::BetheBlochGas(bg);
1907 break;
1908 case kGeant:
1909 { // mean exitation energy (GeV)
1910 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;
1911 Double_t mZA = param[5]>1.e-5?param[5]:(param[3]/param[2]);
1912 if(AliLog::GetDebugLevel("TRD", "AliTRDtrackerV1")>=3) printf("D-AliTRDtrackerV1::PropagateTo(): Mee[%e] <Z/A>[%e]\n", mee, mZA);
1913 // protect against failed calculation of rho in MeanMaterialBudget()
1914 dEdx = AliExternalTrackParam::BetheBlochGeant(bg, param[0]>1.e-6?param[0]:2.33, 0.2, 3., mee, mZA);
1915 }
1916 break;
1917 }
1918 if(AliLog::GetDebugLevel("TRD", "AliTRDtrackerV1")>=2) printf("D-AliTRDtrackerV1::PropagateTo(): dEdx(bg=%e, m=%e)= %e[GeV/cm]\n", bg, mass, dEdx);
1919 if (!t.CorrectForMeanMaterialdEdx(param[1], dir*param[0]*param[4], mass, dEdx)) return 0;
15a2657d 1920*/
41702fec 1921 // Rotate the track if necessary
e7542a7e 1922 if(!AdjustSector(&t)) return 0;
bccda319 1923
41702fec 1924 // New track X-position
1925 xpos = t.GetX();
bccda319 1926
41702fec 1927 }
bccda319 1928
41702fec 1929 return 1;
bccda319 1930
1931}
1932
eb38ed55 1933//_____________________________________________________________________________
e7542a7e 1934Bool_t AliTRDtrackerV1::ReadClusters(TTree *clusterTree)
eb38ed55 1935{
41702fec 1936 //
1937 // Reads AliTRDclusters from the file.
1938 // The names of the cluster tree and branches
1939 // should match the ones used in AliTRDclusterizer::WriteClusters()
1940 //
1941
1942 Int_t nsize = Int_t(clusterTree->GetTotBytes() / (sizeof(AliTRDcluster)));
1943 TObjArray *clusterArray = new TObjArray(nsize+1000);
1944
1945 TBranch *branch = clusterTree->GetBranch("TRDcluster");
1946 if (!branch) {
1947 AliError("Can't get the branch !");
e7542a7e 1948 return kFALSE;
41702fec 1949 }
1950 branch->SetAddress(&clusterArray);
d2eba04b 1951
41702fec 1952 if(!fClusters){
9e85cb05 1953 Float_t nclusters = fkRecoParam->GetNClusters();
4d6aee34 1954 if(fkReconstructor->IsHLT()) nclusters /= AliTRDgeometry::kNsector;
e7542a7e 1955 fClusters = new TClonesArray("AliTRDcluster", Int_t(nclusters));
1956 fClusters->SetOwner(kTRUE);
d2eba04b 1957 SetClustersOwner();
1958 AliInfo(Form("Tracker owning clusters @ %p", (void*)fClusters));
41702fec 1959 }
1960
1961 // Loop through all entries in the tree
1962 Int_t nEntries = (Int_t) clusterTree->GetEntries();
1963 Int_t nbytes = 0;
1964 Int_t ncl = 0;
4d6aee34 1965 AliTRDcluster *c = NULL;
41702fec 1966 for (Int_t iEntry = 0; iEntry < nEntries; iEntry++) {
1967 // Import the tree
1968 nbytes += clusterTree->GetEvent(iEntry);
1969
1970 // Get the number of points in the detector
1971 Int_t nCluster = clusterArray->GetEntriesFast();
1972 for (Int_t iCluster = 0; iCluster < nCluster; iCluster++) {
1973 if(!(c = (AliTRDcluster *) clusterArray->UncheckedAt(iCluster))) continue;
41702fec 1974 new((*fClusters)[ncl++]) AliTRDcluster(*c);
1975 delete (clusterArray->RemoveAt(iCluster));
1976 }
41702fec 1977 }
1978 delete clusterArray;
1979
e7542a7e 1980 return kTRUE;
eb38ed55 1981}
1982
1983//_____________________________________________________________________________
1984Int_t AliTRDtrackerV1::LoadClusters(TTree *cTree)
1985{
41702fec 1986 //
66f6bfd9 1987 // Fills clusters into TRD tracking sectors
41702fec 1988 //
41702fec 1989
9e85cb05 1990 fkRecoParam = fkReconstructor->GetRecoParam(); // load reco param for this event
1991
d2eba04b 1992// if(!fkReconstructor->IsWritingClusters()) AliInfo(Form("IsWritingClusters[%c]", fkReconstructor->IsWritingClusters()?'y':'n'));
1993 if(!(fClusters = AliTRDReconstructor::GetClusters())){
1994 AliWarning("Clusters unavailable from TRD reconstructor. Trying reading from tree ...");
48f8adf3 1995 } else {
e7542a7e 1996 if(!ReadClusters(cTree)) {
d2eba04b 1997 AliError("Reading clusters from tree failed.");
66f6bfd9 1998 return 1;
1999 }
2000 }
66f6bfd9 2001
48f8adf3 2002 if(!fClusters || !fClusters->GetEntriesFast()){
66f6bfd9 2003 AliInfo("No TRD clusters");
41702fec 2004 return 1;
d2eba04b 2005 } else AliInfo(Form("Using :: clusters[%d] onl.tracklets[%d] onl.tracks[%d]",
2006 fClusters?fClusters->GetEntriesFast():0,
2007 AliTRDReconstructor::GetTracklets()?AliTRDReconstructor::GetTracklets()->GetEntriesFast():0,
2008 AliTRDReconstructor::GetTracks()?AliTRDReconstructor::GetTracks()->GetEntriesFast():0));
66f6bfd9 2009
66f6bfd9 2010 BuildTrackingContainers();
2011
66f6bfd9 2012 return 0;
2013}
2014
2015//_____________________________________________________________________________
4d6aee34 2016Int_t AliTRDtrackerV1::LoadClusters(TClonesArray * const clusters)
66f6bfd9 2017{
2018 //
2019 // Fills clusters into TRD tracking sectors
2020 // Function for use in the HLT
2021
2022 if(!clusters || !clusters->GetEntriesFast()){
2023 AliInfo("No TRD clusters");
41702fec 2024 return 1;
d2eba04b 2025 } else AliInfo(Form("Using :: external.clusters[%d]", clusters->GetEntriesFast()));
2026
41702fec 2027
66f6bfd9 2028 fClusters = clusters;
66f6bfd9 2029
9e85cb05 2030 fkRecoParam = fkReconstructor->GetRecoParam(); // load reco param for this event
66f6bfd9 2031 BuildTrackingContainers();
2032
66f6bfd9 2033 return 0;
2034}
2035
2036
2037//____________________________________________________________________
2038Int_t AliTRDtrackerV1::BuildTrackingContainers()
2039{
2040// Building tracking containers for clusters
2041
c79857d5 2042 Int_t nin(0), ncl(fClusters->GetEntriesFast());
2043 while (ncl--) {
2044 AliTRDcluster *c = (AliTRDcluster *) fClusters->UncheckedAt(ncl);
41702fec 2045 if(c->IsInChamber()) nin++;
4226b195 2046 if(fkReconstructor->IsHLT()) c->SetRPhiMethod(AliTRDcluster::kCOG);
41702fec 2047 Int_t detector = c->GetDetector();
2048 Int_t sector = fGeom->GetSector(detector);
053767a4 2049 Int_t stack = fGeom->GetStack(detector);
2050 Int_t layer = fGeom->GetLayer(detector);
41702fec 2051
0b559d95 2052 fTrSec[sector].GetChamber(stack, layer, kTRUE)->InsertCluster(c, ncl);
41702fec 2053 }
b0a48c4d 2054
053767a4 2055 for(int isector =0; isector<AliTRDgeometry::kNsector; isector++){
41702fec 2056 if(!fTrSec[isector].GetNChambers()) continue;
c79857d5 2057 fTrSec[isector].Init(fkReconstructor);
41702fec 2058 }
66f6bfd9 2059
2060 return nin;
eb38ed55 2061}
2062
2063
66f6bfd9 2064
0906e73e 2065//____________________________________________________________________
172b6f82 2066void AliTRDtrackerV1::UnloadClusters()
0906e73e 2067{
d4cf71ca 2068//
2069// Clears the arrays of clusters and tracks. Resets sectors and timebins
2070// If option "force" is also set the containers are also deleted. This is useful
2071// in case of HLT
2072
2073 if(fTracks){
2074 fTracks->Delete();
4d6aee34 2075 if(HasRemoveContainers()){delete fTracks; fTracks = NULL;}
d4cf71ca 2076 }
2077 if(fTracklets){
2078 fTracklets->Delete();
4d6aee34 2079 if(HasRemoveContainers()){delete fTracklets; fTracklets = NULL;}
d4cf71ca 2080 }
d2eba04b 2081 if(fClusters && IsClustersOwner()){
2082 AliInfo(Form("tracker[%p] clearing %d own clusters @ %p", (void*)this, fClusters->GetEntries(), (void*)fClusters));
2083 fClusters->Delete();
2084//
2085// // save clusters array in the reconstructor for further use.
2086// if(!fkReconstructor->IsWritingClusters()){
2087// AliTRDReconstructor::SetClusters(fClusters);
2088// SetClustersOwner(kFALSE);
2089// } else AliTRDReconstructor::SetClusters(NULL);
48f8adf3 2090 }
0906e73e 2091
053767a4 2092 for (int i = 0; i < AliTRDgeometry::kNsector; i++) fTrSec[i].Clear();
0906e73e 2093
41702fec 2094 // Increment the Event Number
2095 AliTRDtrackerDebug::SetEventNumber(AliTRDtrackerDebug::GetEventNumber() + 1);
eb38ed55 2096}
0906e73e 2097
fac58f00 2098// //____________________________________________________________________
2099// void AliTRDtrackerV1::UseClusters(const AliKalmanTrack *t, Int_t) const
2100// {
2101// const AliTRDtrackV1 *track = dynamic_cast<const AliTRDtrackV1*>(t);
2102// if(!track) return;
2103//
4d6aee34 2104// AliTRDseedV1 *tracklet = NULL;
fac58f00 2105// for(Int_t ily=AliTRDgeometry::kNlayer; ily--;){
2106// if(!(tracklet = track->GetTracklet(ily))) continue;
4d6aee34 2107// AliTRDcluster *c = NULL;
8d2bec9e 2108// for(Int_t ic=AliTRDseed::kNclusters; ic--;){
fac58f00 2109// if(!(c=tracklet->GetClusters(ic))) continue;
2110// c->Use();
2111// }
2112// }
2113// }
2114//
b1957d3c 2115
eb38ed55 2116//_____________________________________________________________________________
4d6aee34 2117Bool_t AliTRDtrackerV1::AdjustSector(AliTRDtrackV1 *const track)
eb38ed55 2118{
41702fec 2119 //
2120 // Rotates the track when necessary
2121 //
2122
2123 Double_t alpha = AliTRDgeometry::GetAlpha();
2124 Double_t y = track->GetY();
2125 Double_t ymax = track->GetX()*TMath::Tan(0.5*alpha);
3cfaffa4 2126
41702fec 2127 if (y > ymax) {
2128 if (!track->Rotate( alpha)) {
2129 return kFALSE;
2130 }
2131 }
2132 else if (y < -ymax) {
2133 if (!track->Rotate(-alpha)) {
2134 return kFALSE;
2135 }
2136 }
2137
2138 return kTRUE;
0906e73e 2139
2140}
2141
eb38ed55 2142
0906e73e 2143//____________________________________________________________________
33ab3872 2144AliTRDseedV1* AliTRDtrackerV1::GetTracklet(const AliTRDtrackV1 *const track, Int_t p, Int_t &idx)
0906e73e 2145{
41702fec 2146 // Find tracklet for TRD track <track>
2147 // Parameters
2148 // - track
2149 // - sector
2150 // - plane
2151 // - index
2152 // Output
2153 // tracklet
2154 // index
2155 // Detailed description
2156 //
2157 idx = track->GetTrackletIndex(p);
17896e82 2158 AliTRDseedV1 *tracklet = (idx<0) ? NULL : (AliTRDseedV1*)fTracklets->UncheckedAt(idx);
41702fec 2159
2160 return tracklet;
0906e73e 2161}
2162
2163//____________________________________________________________________
4d6aee34 2164AliTRDseedV1* AliTRDtrackerV1::SetTracklet(const AliTRDseedV1 * const tracklet)
0906e73e 2165{
41702fec 2166 // Add this tracklet to the list of tracklets stored in the tracker
2167 //
2168 // Parameters
2169 // - tracklet : pointer to the tracklet to be added to the list
2170 //
2171 // Output
2172 // - the index of the new tracklet in the tracker tracklets list
2173 //
2174 // Detailed description
2175 // Build the tracklets list if it is not yet created (late initialization)
2176 // and adds the new tracklet to the list.
2177 //
2178 if(!fTracklets){
053767a4 2179 fTracklets = new TClonesArray("AliTRDseedV1", AliTRDgeometry::Nsector()*kMaxTracksStack);
41702fec 2180 fTracklets->SetOwner(kTRUE);
2181 }
2182 Int_t nentries = fTracklets->GetEntriesFast();
2183 return new ((*fTracklets)[nentries]) AliTRDseedV1(*tracklet);
972ef65e 2184}
2185
d20df6fc 2186//____________________________________________________________________
4d6aee34 2187AliTRDtrackV1* AliTRDtrackerV1::SetTrack(const AliTRDtrackV1 * const track)
d20df6fc 2188{
2189 // Add this track to the list of tracks stored in the tracker
2190 //
2191 // Parameters
2192 // - track : pointer to the track to be added to the list
2193 //
2194 // Output
2195 // - the pointer added
2196 //
2197 // Detailed description
2198 // Build the tracks list if it is not yet created (late initialization)
2199 // and adds the new track to the list.
2200 //
2201 if(!fTracks){
053767a4 2202 fTracks = new TClonesArray("AliTRDtrackV1", AliTRDgeometry::Nsector()*kMaxTracksStack);
d20df6fc 2203 fTracks->SetOwner(kTRUE);
2204 }
2205 Int_t nentries = fTracks->GetEntriesFast();
2206 return new ((*fTracks)[nentries]) AliTRDtrackV1(*track);
2207}
2208
2209
0906e73e 2210
e4f2f73d 2211//____________________________________________________________________
eb38ed55 2212Int_t AliTRDtrackerV1::Clusters2TracksSM(Int_t sector, AliESDEvent *esd)
e4f2f73d 2213{
41702fec 2214 //
2215 // Steer tracking for one SM.
2216 //
2217 // Parameters :
2218 // sector : Array of (SM) propagation layers containing clusters
2219 // esd : The current ESD event. On output it contains the also
2220 // the ESD (TRD) tracks found in this SM.
2221 //
2222 // Output :
2223 // Number of tracks found in this TRD supermodule.
2224 //
2225 // Detailed description
2226 //
2227 // 1. Unpack AliTRDpropagationLayers objects for each stack.
2228 // 2. Launch stack tracking.
2229 // See AliTRDtrackerV1::Clusters2TracksStack() for details.
2230 // 3. Pack results in the ESD event.
2231 //
2232
41702fec 2233 Int_t nTracks = 0;
2234 Int_t nChambers = 0;
4d6aee34 2235 AliTRDtrackingChamber **stack = NULL, *chamber = NULL;
053767a4 2236 for(int istack = 0; istack<AliTRDgeometry::kNstack; istack++){
41702fec 2237 if(!(stack = fTrSec[sector].GetStack(istack))) continue;
2238 nChambers = 0;
053767a4 2239 for(int ilayer=0; ilayer<AliTRDgeometry::kNlayer; ilayer++){
2240 if(!(chamber = stack[ilayer])) continue;
9e85cb05 2241 if(chamber->GetNClusters() < fgNTimeBins * fkRecoParam->GetFindableClusters()) continue;
41702fec 2242 nChambers++;
053767a4 2243 //AliInfo(Form("sector %d stack %d layer %d clusters %d", sector, istack, ilayer, chamber->GetNClusters()));
41702fec 2244 }
2245 if(nChambers < 4) continue;
2246 //AliInfo(Form("Doing stack %d", istack));
b1135f96 2247 nTracks += Clusters2TracksStack(stack, fTracksESD);
41702fec 2248 }
050875b0 2249 if(nTracks) AliDebug(2, Form("Number of tracks: SM_%02d[%d]", sector, nTracks));
2250
352cef8f 2251 for(int itrack=0; itrack<nTracks; itrack++){
2252 AliESDtrack *esdTrack((AliESDtrack*)(fTracksESD->operator[](itrack)));
2253 Int_t id = esd->AddTrack(esdTrack);
2254
2255 // set ESD id to stand alone TRD tracks
9e85cb05 2256 if (fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 0){
352cef8f 2257 esdTrack=esd->GetTrack(id);
2258 TObject *o(NULL); Int_t ic(0);
2259 AliTRDtrackV1 *calibTrack(NULL);
2260 while((o = esdTrack->GetCalibObject(ic++))){
2261 if(!(calibTrack = dynamic_cast<AliTRDtrackV1*>(o))) continue;
2262 calibTrack->SetESDid(esdTrack->GetID());
2263 break;
2264 }
2265 }
2266 }
41702fec 2267
2268 // Reset Track and Candidate Number
2269 AliTRDtrackerDebug::SetCandidateNumber(0);
2270 AliTRDtrackerDebug::SetTrackNumber(0);
b1135f96 2271
2272 // delete ESD tracks in the array
2273 fTracksESD->Delete();
41702fec 2274 return nTracks;
e4f2f73d 2275}
2276
2277//____________________________________________________________________
4d6aee34 2278Int_t AliTRDtrackerV1::Clusters2TracksStack(AliTRDtrackingChamber **stack, TClonesArray * const esdTrackList)
e4f2f73d 2279{
41702fec 2280 //
2281 // Make tracks in one TRD stack.
2282 //
2283 // Parameters :
2284 // layer : Array of stack propagation layers containing clusters
2285 // esdTrackList : Array of ESD tracks found by the stand alone tracker.
2286 // On exit the tracks found in this stack are appended.
2287 //
2288 // Output :
2289 // Number of tracks found in this stack.
2290 //
2291 // Detailed description
2292 //
2293 // 1. Find the 3 most useful seeding chambers. See BuildSeedingConfigs() for details.
2294 // 2. Steer AliTRDtrackerV1::MakeSeeds() for 3 seeding layer configurations.
2295 // See AliTRDtrackerV1::MakeSeeds() for more details.
2296 // 3. Arrange track candidates in decreasing order of their quality
2297 // 4. Classify tracks in 5 categories according to:
2298 // a) number of layers crossed
2299 // b) track quality
2300 // 5. Sign clusters by tracks in decreasing order of track quality
2301 // 6. Build AliTRDtrack out of seeding tracklets
2302 // 7. Cook MC label
2303 // 8. Build ESD track and register it to the output list
2304 //
2305
4d6aee34 2306 AliTRDtrackingChamber *chamber = NULL;
2307 AliTRDtrackingChamber **ci = NULL;
41702fec 2308 AliTRDseedV1 sseed[kMaxTracksStack*6]; // to be initialized
2309 Int_t pars[4]; // MakeSeeds parameters
2310
2311 //Double_t alpha = AliTRDgeometry::GetAlpha();
2312 //Double_t shift = .5 * alpha;
2313 Int_t configs[kNConfigs];
2314
fac58f00 2315 // Purge used clusters from the containers
2316 ci = &stack[0];
2317 for(Int_t ic = kNPlanes; ic--; ci++){
2318 if(!(*ci)) continue;
2319 (*ci)->Update();
2320 }
2321
41702fec 2322 // Build initial seeding configurations
2323 Double_t quality = BuildSeedingConfigs(stack, configs);
9e85cb05 2324 if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 10){
41702fec 2325 AliInfo(Form("Plane config %d %d %d Quality %f"
2326 , configs[0], configs[1], configs[2], quality));
2327 }
d931f2aa 2328
41702fec 2329
2330 // Initialize contors
2331 Int_t ntracks, // number of TRD track candidates
2332 ntracks1, // number of registered TRD tracks/iter
2333 ntracks2 = 0; // number of all registered TRD tracks in stack
2334 fSieveSeeding = 0;
d931f2aa 2335
2336 // Get stack index
fac58f00 2337 Int_t ic = 0; ci = &stack[0];
2338 while(ic<kNPlanes && !(*ci)){ic++; ci++;}
2339 if(!(*ci)) return ntracks2;
2340 Int_t istack = fGeom->GetStack((*ci)->GetDetector());
d931f2aa 2341
41702fec 2342 do{
2343 // Loop over seeding configurations
2344 ntracks = 0; ntracks1 = 0;
0b559d95 2345 for (Int_t iconf = 0; iconf<fkRecoParam->GetNumberOfSeedConfigs(); iconf++) {
41702fec 2346 pars[0] = configs[iconf];
2347 pars[1] = ntracks;
d931f2aa 2348 pars[2] = istack;
41702fec 2349 ntracks = MakeSeeds(stack, &sseed[6*ntracks], pars);
6e39bde4 2350 //AliInfo(Form("Number of Tracks after iteration step %d: %d\n", iconf, ntracks));
41702fec 2351 if(ntracks == kMaxTracksStack) break;
2352 }
980d5a2a 2353 AliDebug(2, Form("Candidate TRD tracks %d in iteration %d.", ntracks, fSieveSeeding));
41702fec 2354 if(!ntracks) break;
2355
2356 // Sort the seeds according to their quality
41f024fb 2357 Int_t sort[kMaxTracksStack+1];
41702fec 2358 TMath::Sort(ntracks, fTrackQuality, sort, kTRUE);
68f9b6bd 2359 if(AliLog::GetDebugLevel("TRD", "AliTRDtrackerV1") > 2){
2360 AliDebug(3, "Track candidates classification:");
2361 for (Int_t it(0); it < ntracks; it++) {
2362 Int_t jt(sort[it]);
2363 printf(" %2d idx[%d] Quality[%e]\n", it, jt, fTrackQuality[jt]);
2364 }
2365 }
41702fec 2366
2367 // Initialize number of tracks so far and logic switches
2368 Int_t ntracks0 = esdTrackList->GetEntriesFast();
2369 Bool_t signedTrack[kMaxTracksStack];
2370 Bool_t fakeTrack[kMaxTracksStack];
2371 for (Int_t i=0; i<ntracks; i++){
2372 signedTrack[i] = kFALSE;
2373 fakeTrack[i] = kFALSE;
2374 }
2375 //AliInfo("Selecting track candidates ...");
2376
2377 // Sieve clusters in decreasing order of track quality
68f9b6bd 2378 Int_t jSieve(0), rejectedCandidates(0);
41702fec 2379 do{
41702fec 2380 // Check track candidates
68f9b6bd 2381 rejectedCandidates=0;
41702fec 2382 for (Int_t itrack = 0; itrack < ntracks; itrack++) {
804bb02e 2383 Int_t trackIndex = sort[itrack];
2384 if (signedTrack[trackIndex] || fakeTrack[trackIndex]) continue;
41702fec 2385
804bb02e 2386 // Calculate track parameters from tracklets seeds
804bb02e 2387 Int_t ncl = 0;
2388 Int_t nused = 0;
2389 Int_t nlayers = 0;
2390 Int_t findable = 0;
2391 for (Int_t jLayer = 0; jLayer < kNPlanes; jLayer++) {
2392 Int_t jseed = kNPlanes*trackIndex+jLayer;
68f9b6bd 2393 sseed[jseed].UpdateUsed();
804bb02e 2394 if(!sseed[jseed].IsOK()) continue;
68f9b6bd 2395 // check if primary candidate
f29f13a6 2396 if (TMath::Abs(sseed[jseed].GetYref(0) / sseed[jseed].GetX0()) < 0.158) findable++;
68f9b6bd 2397 ncl += sseed[jseed].GetN();
804bb02e 2398 nused += sseed[jseed].GetNUsed();
2399 nlayers++;
804bb02e 2400 }
2401
f29f13a6 2402 // Filter duplicated tracks
2403 if (nused > 30){
68f9b6bd 2404 AliDebug(4, Form("REJECTED : %d idx[%d] quality[%e] tracklets[%d] usedClusters[%d]", itrack, trackIndex, fTrackQuality[trackIndex], nlayers, nused));
f29f13a6 2405 fakeTrack[trackIndex] = kTRUE;
2406 continue;
2407 }
5ef88e00 2408 if (ncl>0 && Float_t(nused)/ncl >= .25){
68f9b6bd 2409 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 2410 fakeTrack[trackIndex] = kTRUE;
2411 continue;
2412 }
41702fec 2413
68f9b6bd 2414 AliDebug(4, Form("Candidate[%d] Quality[%e] Tracklets[%d] Findable[%d] Ncl[%d] Nused[%d]", trackIndex, fTrackQuality[trackIndex], nlayers, findable, ncl, nused));
2415
f29f13a6 2416 // Classify tracks
2417 Bool_t skip = kFALSE;
2418 switch(jSieve){
68f9b6bd 2419 case 0: // select 6 tracklets primary tracks, good quality
2420 if(nlayers > findable || nlayers < kNPlanes) {skip = kTRUE; break;}
f29f13a6 2421 if(TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -5.){skip = kTRUE; break;}
2422 break;
2423
68f9b6bd 2424 case 1: // select shorter primary tracks, good quality
e7542a7e 2425 //if(findable<4){skip = kTRUE; break;}
f29f13a6 2426 if(nlayers < findable){skip = kTRUE; break;}
2427 if(TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -4.){skip = kTRUE; break;}
2428 break;
2429
68f9b6bd 2430 case 2: // select 6 tracklets secondary tracks
2431 if(nlayers < kNPlanes) { skip = kTRUE; break;}
f29f13a6 2432 if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -6.0){skip = kTRUE; break;}
2433 break;
2434
68f9b6bd 2435 case 3: // select shorter tracks, good quality
2436 if (nlayers<4){skip = kTRUE; break;}
f29f13a6 2437 if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -5.){skip = kTRUE; break;}
2438 break;
2439
68f9b6bd 2440 case 4: // select anything with at least 4 tracklets
2441 if (nlayers<4){skip = kTRUE; break;}
f29f13a6 2442 //if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) - nused/(nlayers-3.0) < -15.0){skip = kTRUE; break;}
2443 break;
2444 }
2445 if(skip){
68f9b6bd 2446 rejectedCandidates++;
5ef88e00 2447 AliDebug(4, Form("REJECTED : %d idx[%d] quality[%e] tracklets[%d] usedClusters[%d]", itrack, trackIndex, fTrackQuality[trackIndex], nlayers, nused));
f29f13a6 2448 continue;
5ef88e00 2449 } else AliDebug(4, Form("ACCEPTED : %d idx[%d] quality[%e] tracklets[%d] usedClusters[%d]", itrack, trackIndex, fTrackQuality[trackIndex], nlayers, nused));
2450
f29f13a6 2451 signedTrack[trackIndex] = kTRUE;
2452
68f9b6bd 2453 AliTRDseedV1 *lseed =&sseed[trackIndex*kNPlanes];
2454 AliTRDtrackV1 *track = MakeTrack(lseed);
2455 if(!track){
2456 AliDebug(1, "Track building failed.");
2457 continue;
2458 } else {
2459 if(AliLog::GetDebugLevel("TRD", "AliTRDtrackerV1") > 1){
2460 Int_t ich = 0; while(!(chamber = stack[ich])) ich++;
2461 AliDebug(2, Form("Track pt=%7.2fGeV/c SM[%2d] Done.", track->Pt(), fGeom->GetSector(chamber->GetDetector())));
2462 }
2463 }
f29f13a6 2464
9e85cb05 2465 if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 1 && fkReconstructor->IsDebugStreaming()){
eb2b4f91 2466 //AliInfo(Form("Track %d [%d] nlayers %d trackQuality = %e nused %d, yref = %3.3f", itrack, trackIndex, nlayers, fTrackQuality[trackIndex], nused, trackParams[1]));
f29f13a6 2467
f29f13a6 2468 AliTRDseedV1 *dseed[6];
b82b4de1 2469 for(Int_t iseed = AliTRDgeometry::kNlayer; iseed--;) dseed[iseed] = new AliTRDseedV1(lseed[iseed]);
f29f13a6 2470
2471 //Int_t eventNrInFile = esd->GetEventNumberInFile();
f29f13a6 2472 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2473 Int_t trackNumber = AliTRDtrackerDebug::GetTrackNumber();
2474 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
a2fbb6ec 2475 TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
f29f13a6 2476 cstreamer << "Clusters2TracksStack"
68f9b6bd 2477 << "EventNumber=" << eventNumber
2478 << "TrackNumber=" << trackNumber
2479 << "CandidateNumber=" << candidateNumber
2480 << "Iter=" << fSieveSeeding
2481 << "Like=" << fTrackQuality[trackIndex]
2482 << "S0.=" << dseed[0]
2483 << "S1.=" << dseed[1]
2484 << "S2.=" << dseed[2]
2485 << "S3.=" << dseed[3]
2486 << "S4.=" << dseed[4]
2487 << "S5.=" << dseed[5]
2488 << "Ncl=" << ncl
2489 << "NLayers=" << nlayers
2490 << "Findable=" << findable
2491 << "NUsed=" << nused
f29f13a6 2492 << "\n";
2493 }
d877f55f 2494
68f9b6bd 2495
f29f13a6 2496 AliESDtrack *esdTrack = new ((*esdTrackList)[ntracks0++]) AliESDtrack();
2497 esdTrack->UpdateTrackParams(track, AliESDtrack::kTRDout);
2498 esdTrack->SetLabel(track->GetLabel());
2499 track->UpdateESDtrack(esdTrack);
2500 // write ESD-friends if neccessary
9e85cb05 2501 if (fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 0){
f29f13a6 2502 AliTRDtrackV1 *calibTrack = new AliTRDtrackV1(*track);
2503 calibTrack->SetOwner();
2504 esdTrack->AddCalibObject(calibTrack);
2505 }
2506 ntracks1++;
2507 AliTRDtrackerDebug::SetTrackNumber(AliTRDtrackerDebug::GetTrackNumber() + 1);
41702fec 2508 }
2509
2510 jSieve++;
68f9b6bd 2511 } while(jSieve<5 && rejectedCandidates); // end track candidates sieve
41702fec 2512 if(!ntracks1) break;
2513
2514 // increment counters
2515 ntracks2 += ntracks1;
4302c900 2516
4d6aee34 2517 if(fkReconstructor->IsHLT()) break;
41702fec 2518 fSieveSeeding++;
2519
2520 // Rebuild plane configurations and indices taking only unused clusters into account
2521 quality = BuildSeedingConfigs(stack, configs);
4d6aee34 2522 if(quality < 1.E-7) break; //fkReconstructor->GetRecoParam() ->GetPlaneQualityThreshold()) break;
41702fec 2523
2524 for(Int_t ip = 0; ip < kNPlanes; ip++){
2525 if(!(chamber = stack[ip])) continue;
c79857d5 2526 chamber->Build(fGeom);//Indices(fSieveSeeding);
41702fec 2527 }
2528
9e85cb05 2529 if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 10){
41702fec 2530 AliInfo(Form("Sieve level %d Plane config %d %d %d Quality %f", fSieveSeeding, configs[0], configs[1], configs[2], quality));
2531 }
2532 } while(fSieveSeeding<10); // end stack clusters sieve
2533
2534
2535
2536 //AliInfo(Form("Registered TRD tracks %d in stack %d.", ntracks2, pars[1]));
2537
2538 return ntracks2;
e4f2f73d 2539}
2540
2541//___________________________________________________________________
eb38ed55 2542Double_t AliTRDtrackerV1::BuildSeedingConfigs(AliTRDtrackingChamber **stack, Int_t *configs)
e4f2f73d 2543{
41702fec 2544 //
2545 // Assign probabilities to chambers according to their
2546 // capability of producing seeds.
2547 //
2548 // Parameters :
2549 //
2550 // layers : Array of stack propagation layers for all 6 chambers in one stack
2551 // configs : On exit array of configuration indexes (see GetSeedingConfig()
2552 // for details) in the decreasing order of their seeding probabilities.
2553 //
2554 // Output :
2555 //
2556 // Return top configuration quality
2557 //
2558 // Detailed description:
2559 //
2560 // To each chamber seeding configuration (see GetSeedingConfig() for
2561 // the list of all configurations) one defines 2 quality factors:
2562 // - an apriori topological quality (see GetSeedingConfig() for details) and
2563 // - a data quality based on the uniformity of the distribution of
2564 // clusters over the x range (time bins population). See CookChamberQA() for details.
2565 // The overall chamber quality is given by the product of this 2 contributions.
2566 //
2567
eb2b4f91 2568 Double_t chamberQ[kNPlanes];memset(chamberQ, 0, kNPlanes*sizeof(Double_t));
4d6aee34 2569 AliTRDtrackingChamber *chamber = NULL;
41702fec 2570 for(int iplane=0; iplane<kNPlanes; iplane++){
2571 if(!(chamber = stack[iplane])) continue;
2572 chamberQ[iplane] = (chamber = stack[iplane]) ? chamber->GetQuality() : 0.;
2573 }
2574
eb2b4f91 2575 Double_t tconfig[kNConfigs];memset(tconfig, 0, kNConfigs*sizeof(Double_t));
2576 Int_t planes[] = {0, 0, 0, 0};
41702fec 2577 for(int iconf=0; iconf<kNConfigs; iconf++){
2578 GetSeedingConfig(iconf, planes);
2579 tconfig[iconf] = fgTopologicQA[iconf];
2580 for(int iplane=0; iplane<4; iplane++) tconfig[iconf] *= chamberQ[planes[iplane]];
2581 }
2582
2583 TMath::Sort((Int_t)kNConfigs, tconfig, configs, kTRUE);
0b559d95 2584 // AliInfo(Form("q[%d] = %f", configs[0], tconfig[configs[0]]));
41702fec 2585 // AliInfo(Form("q[%d] = %f", configs[1], tconfig[configs[1]]));
2586 // AliInfo(Form("q[%d] = %f", configs[2], tconfig[configs[2]]));
2587
2588 return tconfig[configs[0]];
e4f2f73d 2589}
2590
2591//____________________________________________________________________
e17f4785 2592Int_t AliTRDtrackerV1::MakeSeeds(AliTRDtrackingChamber **stack, AliTRDseedV1 * const sseed, const Int_t * const ipar)
e4f2f73d 2593{
afa21247 2594//
2a3191bb 2595// Seed tracklets and build candidate TRD tracks. The procedure is used during barrel tracking to account for tracks which are
2596// either missed by TPC prolongation or conversions inside the TRD volume.
2597// For stand alone tracking the procedure is used to estimate all tracks measured by TRD.
afa21247 2598//
2599// Parameters :
2600// layers : Array of stack propagation layers containing clusters
2601// sseed : Array of empty tracklet seeds. On exit they are filled.
2602// ipar : Control parameters:
2603// ipar[0] -> seeding chambers configuration
2604// ipar[1] -> stack index
2605// ipar[2] -> number of track candidates found so far
2606//
2607// Output :
2608// Number of tracks candidates found.
2609//
2610// The following steps are performed:
2611// 1. Build seeding layers by collapsing all time bins from each of the four seeding chambers along the
2612// radial coordinate. See AliTRDtrackingChamber::GetSeedingLayer() for details. The chambers selection for seeding
2613// is described in AliTRDtrackerV1::Clusters2TracksStack().
2614// 2. Using the seeding clusters from the seeding layer (step 1) build combinatorics using the following algorithm:
2615// - for each seeding cluster in the lower seeding layer find
2616// - all seeding clusters in the upper seeding layer inside a road defined by a given phi angle. The angle
2617// is calculated on the minimum pt of tracks from vertex accesible to the stand alone tracker.
2618// - for each pair of two extreme seeding clusters select middle upper cluster using roads defined externally by the
2619// reco params
2620// - select last seeding cluster as the nearest to the linear approximation of the track described by the first three
2621// seeding clusters.
2622// The implementation of road calculation and cluster selection can be found in the functions AliTRDchamberTimeBin::BuildCond()
2623// and AliTRDchamberTimeBin::GetClusters().
2624// 3. Helix fit of the seeding clusters set. (see AliTRDtrackerFitter::FitRieman(AliTRDcluster**)). No tilt correction is
2625// performed at this level
2626// 4. Initialize seeding tracklets in the seeding chambers.
2627// 5. *Filter 0* Chi2 cut on the Y and Z directions. The threshold is set externally by the reco params.
2628// 6. Attach (true) clusters to seeding tracklets (see AliTRDseedV1::AttachClusters()) and fit tracklet (see
2629// AliTRDseedV1::Fit()). The number of used clusters used by current seeds should not exceed ... (25).
2630// 7. *Filter 1* Check if all 4 seeding tracklets are correctly constructed.
2631// 8. Helix fit of the clusters from the seeding tracklets with tilt correction. Refit tracklets using the new
2632// approximation of the track.
2633// 9. *Filter 2* Calculate likelihood of the track. (See AliTRDtrackerV1::CookLikelihood()). The following quantities are
2634// checked against the Riemann fit:
2635// - position resolution in y
2636// - angular resolution in the bending plane
2637// - likelihood of the number of clusters attached to the tracklet
2638// 10. Extrapolation of the helix fit to the other 2 chambers *non seeding* chambers:
2639// - Initialization of extrapolation tracklets with the fit parameters
2640// - Attach clusters to extrapolated tracklets
2641// - Helix fit of tracklets
2642// 11. Improve seeding tracklets quality by reassigning clusters based on the last parameters of the track
2643// See AliTRDtrackerV1::ImproveSeedQuality() for details.
2644// 12. Helix fit of all 6 seeding tracklets and chi2 calculation
2645// 13. Hyperplane fit and track quality calculation. See AliTRDtrackerFitter::FitHyperplane() for details.
2646// 14. Cooking labels for tracklets. Should be done only for MC
2647// 15. Register seeds.
2648//
2649// Authors:
2650// Marian Ivanov <M.Ivanov@gsi.de>
2651// Alexandru Bercuci <A.Bercuci@gsi.de>
2652// Markus Fasel <M.Fasel@gsi.de>
41702fec 2653
4d6aee34 2654 AliTRDtrackingChamber *chamber = NULL;
2655 AliTRDcluster *c[kNSeedPlanes] = {NULL, NULL, NULL, NULL}; // initilize seeding clusters
e17f4785 2656 AliTRDseedV1 *cseed = &sseed[0]; // initialize tracklets for first track
41702fec 2657 Int_t ncl, mcl; // working variable for looping over clusters
2658 Int_t index[AliTRDchamberTimeBin::kMaxClustersLayer], jndex[AliTRDchamberTimeBin::kMaxClustersLayer];
2659 // chi2 storage
2660 // chi2[0] = tracklet chi2 on the Z direction
2661 // chi2[1] = tracklet chi2 on the R direction
2662 Double_t chi2[4];
2663
afa21247 2664 // this should be data member of AliTRDtrack TODO
d2eba04b 2665// Double_t seedQuality[kMaxTracksStack];
41702fec 2666
2667 // unpack control parameters
2668 Int_t config = ipar[0];
2669 Int_t ntracks = ipar[1];
d931f2aa 2670 Int_t istack = ipar[2];
41702fec 2671 Int_t planes[kNSeedPlanes]; GetSeedingConfig(config, planes);
afa21247 2672 Int_t planesExt[kNPlanes-kNSeedPlanes]; GetExtrapolationConfig(config, planesExt);
be24510a 2673
2674
41702fec 2675 // Init chambers geometry
41702fec 2676 Double_t hL[kNPlanes]; // Tilting angle
2677 Float_t padlength[kNPlanes]; // pad lenghts
dd8059a8 2678 Float_t padwidth[kNPlanes]; // pad widths
4d6aee34 2679 AliTRDpadPlane *pp = NULL;
41702fec 2680 for(int iplane=0; iplane<kNPlanes; iplane++){
2681 pp = fGeom->GetPadPlane(iplane, istack);
bb79ccd5 2682 hL[iplane] = TMath::Tan(TMath::DegToRad()*pp->GetTiltingAngle());
41702fec 2683 padlength[iplane] = pp->GetLengthIPad();
dd8059a8 2684 padwidth[iplane] = pp->GetWidthIPad();
41702fec 2685 }
2686
eb2b4f91 2687 // Init anode wire position for chambers
e165b64b 2688 Double_t x0[kNPlanes], // anode wire position
eb2b4f91 2689 driftLength = .5*AliTRDgeometry::AmThick() - AliTRDgeometry::DrThick(); // drift length
4d6aee34 2690 TGeoHMatrix *matrix = NULL;
eb2b4f91 2691 Double_t loc[] = {AliTRDgeometry::AnodePos(), 0., 0.};
2692 Double_t glb[] = {0., 0., 0.};
2693 AliTRDtrackingChamber **cIter = &stack[0];
a3743898 2694 for(int iLayer=0; iLayer<kNPlanes; iLayer++,cIter++){
eb2b4f91 2695 if(!(*cIter)) continue;
e165b64b 2696 if(!(matrix = fGeom->GetClusterMatrix((*cIter)->GetDetector()))){
e165b64b 2697 x0[iLayer] = fgkX0[iLayer];
e7542a7e 2698 continue;
e165b64b 2699 }
eb2b4f91 2700 matrix->LocalToMaster(loc, glb);
2701 x0[iLayer] = glb[0];
2702 }
2703
980d5a2a 2704 AliDebug(2, Form("Making seeds Stack[%d] Config[%d] Tracks[%d]...", istack, config, ntracks));
41702fec 2705
d931f2aa 2706 // Build seeding layers
d611c74f 2707 ResetSeedTB();
41702fec 2708 Int_t nlayers = 0;
41702fec 2709 for(int isl=0; isl<kNSeedPlanes; isl++){
2710 if(!(chamber = stack[planes[isl]])) continue;
4d6aee34 2711 if(!chamber->GetSeedingLayer(fSeedTB[isl], fGeom, fkReconstructor)) continue;
41702fec 2712 nlayers++;
41702fec 2713 }
eb2b4f91 2714 if(nlayers < kNSeedPlanes) return ntracks;
41702fec 2715
2716
2717 // Start finding seeds
2718 Double_t cond0[4], cond1[4], cond2[4];
2719 Int_t icl = 0;
d611c74f 2720 while((c[3] = (*fSeedTB[3])[icl++])){
41702fec 2721 if(!c[3]) continue;
d611c74f 2722 fSeedTB[0]->BuildCond(c[3], cond0, 0);
2723 fSeedTB[0]->GetClusters(cond0, index, ncl);
41702fec 2724 //printf("Found c[3] candidates 0 %d\n", ncl);
2725 Int_t jcl = 0;
2726 while(jcl<ncl) {
d611c74f 2727 c[0] = (*fSeedTB[0])[index[jcl++]];
41702fec 2728 if(!c[0]) continue;
2729 Double_t dx = c[3]->GetX() - c[0]->GetX();
afa21247 2730 Double_t dzdx = (c[3]->GetZ() - c[0]->GetZ())/dx;
2731 Double_t dydx = (c[3]->GetY() - c[0]->GetY())/dx;
2732 fSeedTB[1]->BuildCond(c[0], cond1, 1, dzdx, dydx);
d611c74f 2733 fSeedTB[1]->GetClusters(cond1, jndex, mcl);
41702fec 2734 //printf("Found c[0] candidates 1 %d\n", mcl);
2735
2736 Int_t kcl = 0;
2737 while(kcl<mcl) {
d611c74f 2738 c[1] = (*fSeedTB[1])[jndex[kcl++]];
2739 if(!c[1]) continue;
afa21247 2740 fSeedTB[2]->BuildCond(c[1], cond2, 2, dzdx, dydx);
d611c74f 2741 c[2] = fSeedTB[2]->GetNearestCluster(cond2);
2742 //printf("Found c[1] candidate 2 %p\n", c[2]);
2743 if(!c[2]) continue;
980d5a2a 2744
2745 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].",
2746 c[0]->GetX(), c[0]->GetY(), c[0]->GetZ(),
2747 c[1]->GetX(), c[1]->GetY(), c[1]->GetZ(),
2748 c[2]->GetX(), c[2]->GetY(), c[2]->GetZ(),
2749 c[3]->GetX(), c[3]->GetY(), c[3]->GetZ()));
d611c74f 2750
804bb02e 2751 for (Int_t il = 0; il < kNPlanes; il++) cseed[il].Reset();
41702fec 2752
d611c74f 2753 FitRieman(c, chi2);
2754
d931f2aa 2755 AliTRDseedV1 *tseed = &cseed[0];
bb2db46c 2756 cIter = &stack[0];
2757 for(int iLayer=0; iLayer<kNPlanes; iLayer++, tseed++, cIter++){
2758 Int_t det = (*cIter) ? (*cIter)->GetDetector() : -1;
eb2b4f91 2759 tseed->SetDetector(det);
43d6ad34 2760 tseed->SetTilt(hL[iLayer]);
2761 tseed->SetPadLength(padlength[iLayer]);
dd8059a8 2762 tseed->SetPadWidth(padwidth[iLayer]);
4d6aee34 2763 tseed->SetReconstructor(fkReconstructor);
eb2b4f91 2764 tseed->SetX0(det<0 ? fR[iLayer]+driftLength : x0[iLayer]);
d611c74f 2765 tseed->Init(GetRiemanFitter());
f29f13a6 2766 tseed->SetStandAlone(kTRUE);
d611c74f 2767 }
2768
2769 Bool_t isFake = kFALSE;
9e85cb05 2770 if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) >= 2 && fkReconstructor->IsDebugStreaming()){
d611c74f 2771 if (c[0]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
2772 if (c[1]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
2773 if (c[2]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
2774
2775 Double_t xpos[4];
2776 for(Int_t l = 0; l < kNSeedPlanes; l++) xpos[l] = fSeedTB[l]->GetX();
2777 Float_t yref[4];
2778 for(int il=0; il<4; il++) yref[il] = cseed[planes[il]].GetYref(0);
2779 Int_t ll = c[3]->GetLabel(0);
2780 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2781 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2782 AliRieman *rim = GetRiemanFitter();
a2fbb6ec 2783 TTreeSRedirector &cs0 = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
d611c74f 2784 cs0 << "MakeSeeds0"
2785 <<"EventNumber=" << eventNumber
2786 <<"CandidateNumber=" << candidateNumber
2787 <<"isFake=" << isFake
2788 <<"config=" << config
2789 <<"label=" << ll
2790 <<"chi2z=" << chi2[0]
2791 <<"chi2y=" << chi2[1]
2792 <<"Y2exp=" << cond2[0]
2793 <<"Z2exp=" << cond2[1]
2794 <<"X0=" << xpos[0] //layer[sLayer]->GetX()
2795 <<"X1=" << xpos[1] //layer[sLayer + 1]->GetX()
2796 <<"X2=" << xpos[2] //layer[sLayer + 2]->GetX()
2797 <<"X3=" << xpos[3] //layer[sLayer + 3]->GetX()
2798 <<"yref0=" << yref[0]
2799 <<"yref1=" << yref[1]
2800 <<"yref2=" << yref[2]
2801 <<"yref3=" << yref[3]
2802 <<"c0.=" << c[0]
2803 <<"c1.=" << c[1]
2804 <<"c2.=" << c[2]
2805 <<"c3.=" << c[3]
2806 <<"Seed0.=" << &cseed[planes[0]]
2807 <<"Seed1.=" << &cseed[planes[1]]
2808 <<"Seed2.=" << &cseed[planes[2]]
2809 <<"Seed3.=" << &cseed[planes[3]]
2810 <<"RiemanFitter.=" << rim
2811 <<"\n";
2812 }
9e85cb05 2813 if(chi2[0] > fkRecoParam->GetChi2Z()/*7./(3. - sLayer)*//*iter*/){
980d5a2a 2814 AliDebug(3, Form("Filter on chi2Z [%f].", chi2[0]));
d611c74f 2815 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2816 continue;
2817 }
9e85cb05 2818 if(chi2[1] > fkRecoParam->GetChi2Y()/*1./(3. - sLayer)*//*iter*/){
980d5a2a 2819 AliDebug(3, Form("Filter on chi2Y [%f].", chi2[1]));
d611c74f 2820 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2821 continue;
2822 }
2823 //AliInfo("Passed chi2 filter.");
2824
2825 // try attaching clusters to tracklets
6e39bde4 2826 Int_t mlayers = 0;
980d5a2a 2827 AliTRDcluster *cl = NULL;
be24510a 2828 for(int iLayer=0; iLayer<kNSeedPlanes; iLayer++){
d611c74f 2829 Int_t jLayer = planes[iLayer];
980d5a2a 2830 Int_t nNotInChamber = 0;
f29f13a6 2831 if(!cseed[jLayer].AttachClusters(stack[jLayer], kTRUE)) continue;
980d5a2a 2832 if(/*fkReconstructor->IsHLT()*/kFALSE){
2833 cseed[jLayer].UpdateUsed();
2834 if(!cseed[jLayer].IsOK()) continue;
2835 }else{
2836 cseed[jLayer].Fit();
2837 cseed[jLayer].UpdateUsed();
2838 cseed[jLayer].ResetClusterIter();
2839 while((cl = cseed[jLayer].NextCluster())){
2840 if(!cl->IsInChamber()) nNotInChamber++;
2841 }
2842 //printf("clusters[%d], used[%d], not in chamber[%d]\n", cseed[jLayer].GetN(), cseed[jLayer].GetNUsed(), nNotInChamber);
2843 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
2844 }
d611c74f 2845 mlayers++;
2846 }
be24510a 2847
2848 if(mlayers < kNSeedPlanes){
980d5a2a 2849 AliDebug(2, Form("Found only %d tracklets out of %d. Skip.", mlayers, kNSeedPlanes));
be24510a 2850 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2851 continue;
2852 }
2853
2854 // temporary exit door for the HLT
4d6aee34 2855 if(fkReconstructor->IsHLT()){
be24510a 2856 // attach clusters to extrapolation chambers
2857 for(int iLayer=0; iLayer<kNPlanes-kNSeedPlanes; iLayer++){
2858 Int_t jLayer = planesExt[iLayer];
2859 if(!(chamber = stack[jLayer])) continue;
980d5a2a 2860 if(!cseed[jLayer].AttachClusters(chamber, kTRUE)) continue;
5f1ae1e7 2861 cseed[jLayer].Fit();
be24510a 2862 }
0b559d95 2863 //FitTiltedRiemanConstraint(&cseed[0], GetZ());
4302c900 2864 fTrackQuality[ntracks] = 1.; // dummy value
2865 ntracks++;
218ba867 2866 if(ntracks == kMaxTracksStack) return ntracks;
4302c900 2867 cseed += 6;
2868 continue;
2869 }
2870
be24510a 2871
f29f13a6 2872 // Update Seeds and calculate Likelihood
d611c74f 2873 // fit tracklets and cook likelihood
68f9b6bd 2874 Double_t chi2Vals[4];
2875 chi2Vals[0] = FitTiltedRieman(&cseed[0], kTRUE);
f29f13a6 2876 for(int iLayer=0; iLayer<kNSeedPlanes; iLayer++){
2877 Int_t jLayer = planes[iLayer];
2eb10c34 2878 cseed[jLayer].Fit(1);
f29f13a6 2879 }
91834b8d 2880 Double_t like = CookLikelihood(&cseed[0], planes); // to be checked
d611c74f 2881
9e85cb05 2882 if (TMath::Log(1.E-9 + like) < fkRecoParam->GetTrackLikelihood()){
980d5a2a 2883 AliDebug(3, Form("Filter on likelihood %f[%e].", TMath::Log(1.E-9 + like), like));
d611c74f 2884 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2885 continue;
2886 }
2887 //AliInfo(Form("Passed likelihood %f[%e].", TMath::Log(1.E-9 + like), like));
2888
d2eba04b 2889 // book preliminry results
2890 //seedQuality[ntracks] = like;
d611c74f 2891 fSeedLayer[ntracks] = config;/*sLayer;*/
2892
2893 // attach clusters to the extrapolation seeds
980d5a2a 2894 Int_t elayers(0);
be24510a 2895 for(int iLayer=0; iLayer<kNPlanes-kNSeedPlanes; iLayer++){
2896 Int_t jLayer = planesExt[iLayer];
d611c74f 2897 if(!(chamber = stack[jLayer])) continue;
d611c74f 2898
2899 // fit extrapolated seed
2900 if ((jLayer == 0) && !(cseed[1].IsOK())) continue;
2901 if ((jLayer == 5) && !(cseed[4].IsOK())) continue;
2902 AliTRDseedV1 pseed = cseed[jLayer];
f29f13a6 2903 if(!pseed.AttachClusters(chamber, kTRUE)) continue;
2eb10c34 2904 pseed.Fit(1);
d611c74f 2905 cseed[jLayer] = pseed;
68f9b6bd 2906 chi2Vals[0] = FitTiltedRieman(cseed, kTRUE);
2eb10c34 2907 cseed[jLayer].Fit(1);
980d5a2a 2908 elayers++;
d611c74f 2909 }
2910
2911 // AliInfo("Extrapolation done.");
2912 // Debug Stream containing all the 6 tracklets
9e85cb05 2913 if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) >= 2 && fkReconstructor->IsDebugStreaming()){
a2fbb6ec 2914 TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
d611c74f 2915 TLinearFitter *tiltedRieman = GetTiltedRiemanFitter();
2916 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2917 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2918 cstreamer << "MakeSeeds1"
2919 << "EventNumber=" << eventNumber
2920 << "CandidateNumber=" << candidateNumber
2921 << "S0.=" << &cseed[0]
2922 << "S1.=" << &cseed[1]
2923 << "S2.=" << &cseed[2]
2924 << "S3.=" << &cseed[3]
2925 << "S4.=" << &cseed[4]
2926 << "S5.=" << &cseed[5]
2927 << "FitterT.=" << tiltedRieman
2928 << "\n";
2929 }
2930
9e85cb05 2931 if(fkRecoParam->HasImproveTracklets()){
68f9b6bd 2932 if(!ImproveSeedQuality(stack, cseed, chi2Vals[0])){
980d5a2a 2933 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
68f9b6bd 2934 AliDebug(3, "ImproveSeedQuality() failed.");
980d5a2a 2935 }
d611c74f 2936 }
d611c74f 2937
68f9b6bd 2938 // do track fitting with vertex constraint
2939 if(fkRecoParam->IsVertexConstrained()) chi2Vals[1] = FitTiltedRiemanConstraint(&cseed[0], GetZ());
2940 else chi2Vals[1] = -1.;
2941 chi2Vals[2] = GetChi2Z(&cseed[0]);
2942 chi2Vals[3] = GetChi2Phi(&cseed[0]);
2943
2944 // calculate track quality
2945 fTrackQuality[ntracks] = CalculateTrackLikelihood(&chi2Vals[0]);
fac58f00 2946
9e85cb05 2947 if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) >= 2 && fkReconstructor->IsDebugStreaming()){
a2fbb6ec 2948 TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
d611c74f 2949 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2950 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2951 TLinearFitter *fitterTC = GetTiltedRiemanFitterConstraint();
2952 TLinearFitter *fitterT = GetTiltedRiemanFitter();
91834b8d 2953 Int_t ncls = 0;
2954 for(Int_t iseed = 0; iseed < kNPlanes; iseed++){
2955 ncls += cseed[iseed].IsOK() ? cseed[iseed].GetN2() : 0;
2956 }
d611c74f 2957 cstreamer << "MakeSeeds2"
2958 << "EventNumber=" << eventNumber
2959 << "CandidateNumber=" << candidateNumber
2960 << "Chi2TR=" << chi2Vals[0]
2961 << "Chi2TC=" << chi2Vals[1]
2962 << "Nlayers=" << mlayers
91834b8d 2963 << "NClusters=" << ncls
d611c74f 2964 << "Like=" << like
2965 << "S0.=" << &cseed[0]
2966 << "S1.=" << &cseed[1]
2967 << "S2.=" << &cseed[2]
2968 << "S3.=" << &cseed[3]
2969 << "S4.=" << &cseed[4]
2970 << "S5.=" << &cseed[5]
d611c74f 2971 << "FitterT.=" << fitterT
2972 << "FitterTC.=" << fitterTC
2973 << "\n";
2974 }
68f9b6bd 2975 if(AliLog::GetDebugLevel("TRD", "AliTRDtrackerV1")){
2976 Double_t pt[]={0., 0.};
2977 for(Int_t il(0); il<kNPlanes; il++){
2978 if(!cseed[il].IsOK()) continue;
2979 pt[0] = GetBz()*kB2C/cseed[il].GetC();
2980 pt[1] = GetBz()*kB2C/cseed[il].GetC(1);
2981 break;
2982 }
2983 AliDebug(2, Form("Candidate[%2d] pt[%7.3f %7.3f] Q[%e]\n"
2984 " [0] x[%6.2f] n[%2d] nu[%d] OK[%c]\n"
2985 " [1] x[%6.2f] n[%2d] nu[%d] OK[%c]\n"
2986 " [2] x[%6.2f] n[%2d] nu[%d] OK[%c]\n"
2987 " [3] x[%6.2f] n[%2d] nu[%d] OK[%c]\n"
2988 " [4] x[%6.2f] n[%2d] nu[%d] OK[%c]\n"
2989 " [5] x[%6.2f] n[%2d] nu[%d] OK[%c]"
2990 , ntracks, pt[0], pt[1], fTrackQuality[ntracks]
2991 ,cseed[0].GetX(), cseed[0].GetN(), cseed[0].GetNUsed(), cseed[0].IsOK()?'y':'n'
2992 ,cseed[1].GetX(), cseed[1].GetN(), cseed[1].GetNUsed(), cseed[1].IsOK()?'y':'n'
2993 ,cseed[2].GetX(), cseed[2].GetN(), cseed[2].GetNUsed(), cseed[2].IsOK()?'y':'n'
2994 ,cseed[3].GetX(), cseed[3].GetN(), cseed[3].GetNUsed(), cseed[3].IsOK()?'y':'n'
2995 ,cseed[4].GetX(), cseed[4].GetN(), cseed[4].GetNUsed(), cseed[4].IsOK()?'y':'n'
2996 ,cseed[5].GetX(), cseed[5].GetN(), cseed[5].GetNUsed(), cseed[5].IsOK()?'y':'n'));
2997 }
d611c74f 2998 ntracks++;
2999 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
3000 if(ntracks == kMaxTracksStack){
3001 AliWarning(Form("Number of seeds reached maximum allowed (%d) in stack.", kMaxTracksStack));
3002 return ntracks;
3003 }
3004 cseed += 6;
41702fec 3005 }
3006 }
3007 }
41702fec 3008
3009 return ntracks;
e4f2f73d 3010}
3011
3012//_____________________________________________________________________________
68f9b6bd 3013AliTRDtrackV1* AliTRDtrackerV1::MakeTrack(AliTRDseedV1 * const tracklet)
e4f2f73d 3014{
afa21247 3015//
3016// Build a TRD track out of tracklet candidates
3017//
3018// Parameters :
3019// seeds : array of tracklets
3020// params : array of track parameters as they are estimated by stand alone tracker. 7 elements.
3021// [0] - radial position of the track at reference point
3022// [1] - y position of the fit at [0]
3023// [2] - z position of the fit at [0]
3024// [3] - snp of the first tracklet
3025// [4] - tgl of the first tracklet
3026// [5] - curvature of the Riemann fit - 1/pt
3027// [6] - sector rotation angle
3028//
3029// Output :
3030// The TRD track.
3031//
3032// Initialize the TRD track based on the parameters of the fit and a parametric covariance matrix
3033// (diagonal with constant variance terms TODO - correct parameterization)
3034//
3035// In case of HLT just register the tracklets in the tracker and return values of the Riemann fit. For the
3036// offline case perform a full Kalman filter on the already found tracklets (see AliTRDtrackerV1::FollowBackProlongation()
3037// for details). Do also MC label calculation and PID if propagation successfully.
41702fec 3038
0b559d95 3039 if(fkReconstructor->IsHLT()) FitTiltedRiemanConstraint(tracklet, 0);
41702fec 3040 Double_t alpha = AliTRDgeometry::GetAlpha();
3041 Double_t shift = AliTRDgeometry::GetAlpha()/2.0;
41702fec 3042
68f9b6bd 3043 // find first good tracklet
3044 Int_t idx(0); while(idx<kNPlanes && !tracklet[idx].IsOK()) idx++;
3045 if(idx>2){ AliDebug(1, Form("Found suspect track start @ layer idx[%d]\n"
3046 " %c[0] x0[%f] n[%d] nu[%d] OK[%c]\n"
3047 " %c[1] x0[%f] n[%d] nu[%d] OK[%c]\n"
3048 " %c[2] x0[%f] n[%d] nu[%d] OK[%c]\n"
3049 " %c[3] x0[%f] n[%d] nu[%d] OK[%c]\n"
3050 " %c[4] x0[%f] n[%d] nu[%d] OK[%c]\n"
3051 " %c[5] x0[%f] n[%d] nu[%d] OK[%c]"
3052 ,idx
3053 ,idx==0?'*':' ', tracklet[0].GetX0(), tracklet[0].GetN(), tracklet[0].GetNUsed(), tracklet[0].IsOK()?'y':'n'
3054 ,idx==1?'*':' ', tracklet[1].GetX0(), tracklet[1].GetN(), tracklet[1].GetNUsed(), tracklet[1].IsOK()?'y':'n'
3055 ,idx==2?'*':' ', tracklet[2].GetX0(), tracklet[2].GetN(), tracklet[2].GetNUsed(), tracklet[2].IsOK()?'y':'n'
3056 ,idx==3?'*':' ', tracklet[3].GetX0(), tracklet[3].GetN(), tracklet[3].GetNUsed(), tracklet[3].IsOK()?'y':'n'
3057 ,idx==4?'*':' ', tracklet[4].GetX0(), tracklet[4].GetN(), tracklet[4].GetNUsed(), tracklet[4].IsOK()?'y':'n'
3058 ,idx==5?'*':' ', tracklet[5].GetX0(), tracklet[5].GetN(), tracklet[5].GetNUsed(), tracklet[5].IsOK()?'y':'n'));
3059 return NULL;
3060 }
3061
8def512c 3062 Double_t dx(5.);
3063 Double_t x(tracklet[idx].GetX0() - dx);
68f9b6bd 3064 // Build track parameters
3065 Double_t params[] = {
3066 tracklet[idx].GetYref(0) - dx*tracklet[idx].GetYref(1) // y
3067 ,tracklet[idx].GetZref(0) - dx*tracklet[idx].GetZref(1) // z
3068 ,TMath::Sin(TMath::ATan(tracklet[idx].GetYref(1))) // snp
3069 ,tracklet[idx].GetZref(1) / TMath::Sqrt(1. + tracklet[idx].GetYref(1) * tracklet[idx].GetYref(1)) // tgl
8def512c 3070 ,tracklet[idx].GetC(fkReconstructor->IsHLT()?1:0) // curvature -> 1/pt
68f9b6bd 3071 };
3072 Int_t sector(fGeom->GetSector(tracklet[idx].GetDetector()));
3073
3074 Double_t c[15];
afa21247 3075 c[ 0] = 0.2; // s^2_y
3076 c[ 1] = 0.0; c[ 2] = 2.0; // s^2_z
3077 c[ 3] = 0.0; c[ 4] = 0.0; c[ 5] = 0.02; // s^2_snp
3078 c[ 6] = 0.0; c[ 7] = 0.0; c[ 8] = 0.0; c[ 9] = 0.1; // s^2_tgl
68f9b6bd 3079 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
3080
3081 AliTRDtrackV1 track(tracklet, params, c, x, sector*alpha+shift);
41702fec 3082
4d6aee34 3083 AliTRDseedV1 *ptrTracklet = NULL;
9887cc9f 3084
3085 // skip Kalman filter for HLT
5f1ae1e7 3086 if(/*fkReconstructor->IsHLT()*/kFALSE){
9887cc9f 3087 for (Int_t jLayer = 0; jLayer < AliTRDgeometry::kNlayer; jLayer++) {
3088 track.UnsetTracklet(jLayer);