]> git.uio.no Git - u/mrichter/AliRoot.git/blame - TRD/AliTRDtrackerV1.cxx
git://git.uio.no / u / mrichter / AliRoot.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
- move tracklet index stored in track from UShort_t to Int_t - follow the
[u/mrichter/AliRoot.git] / TRD / AliTRDtrackerV1.cxx
CommitLineData
e4f2f73d 1/**************************************************************************
972ef65e 2* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
3* *
4* Author: The ALICE Off-line Project. *
5* Contributors are mentioned in the code where appropriate. *
6* *
7* Permission to use, copy, modify and distribute this software and its *
8* documentation strictly for non-commercial purposes is hereby granted *
9* without fee, provided that the above copyright notice appears in all *
10* copies and that both the copyright notice and this permission notice *
11* appear in the supporting documentation. The authors make no claims *
12* about the suitability of this software for any purpose. It is *
13* provided "as is" without express or implied warranty. *
14**************************************************************************/
e4f2f73d 15
16/* $Id$ */
17
18///////////////////////////////////////////////////////////////////////////////
19// //
20// Track finder //
21// //
22// Authors: //
23// Alex Bercuci <A.Bercuci@gsi.de> //
24// Markus Fasel <M.Fasel@gsi.de> //
25// //
26///////////////////////////////////////////////////////////////////////////////
27
e4f2f73d 28#include <TBranch.h>
bb56afff 29#include <TDirectory.h>
e4f2f73d 30#include <TLinearFitter.h>
e4f2f73d 31#include <TTree.h>
32#include <TClonesArray.h>
e4f2f73d 33#include <TTreeStream.h>
eb2b4f91 34#include <TGeoMatrix.h>
35#include <TGeoManager.h>
e4f2f73d 36
37#include "AliLog.h"
fac58f00 38#include "AliMathBase.h"
e4f2f73d 39#include "AliESDEvent.h"
bb56afff 40#include "AliGeomManager.h"
e4f2f73d 41#include "AliRieman.h"
42#include "AliTrackPointArray.h"
43
e4f2f73d 44#include "AliTRDgeometry.h"
45#include "AliTRDpadPlane.h"
e4f2f73d 46#include "AliTRDcalibDB.h"
e4f2f73d 47#include "AliTRDReconstructor.h"
48#include "AliTRDCalibraFillHisto.h"
e4f2f73d 49#include "AliTRDrecoParam.h"
bb56afff 50
51#include "AliTRDcluster.h"
828c6f80 52#include "AliTRDdigitsParam.h"
e4f2f73d 53#include "AliTRDseedV1.h"
0906e73e 54#include "AliTRDtrackV1.h"
bb56afff 55#include "AliTRDtrackerV1.h"
56#include "AliTRDtrackerDebug.h"
57#include "AliTRDtrackingChamber.h"
58#include "AliTRDchamberTimeBin.h"
59
e4f2f73d 60ClassImp(AliTRDtrackerV1)
903326c1 61ClassImp(AliTRDtrackerV1::AliTRDLeastSquare)
62ClassImp(AliTRDtrackerV1::AliTRDtrackFitterRieman)
eb38ed55 63
eb38ed55 64const Float_t AliTRDtrackerV1::fgkMinClustersInTrack = 0.5; //
65const Float_t AliTRDtrackerV1::fgkLabelFraction = 0.8; //
66const Double_t AliTRDtrackerV1::fgkMaxChi2 = 12.0; //
67const Double_t AliTRDtrackerV1::fgkMaxSnp = 0.95; // Maximum local sine of the azimuthal angle
68const Double_t AliTRDtrackerV1::fgkMaxStep = 2.0; // Maximal step size in propagation
d76231c8 69Double_t AliTRDtrackerV1::fgTopologicQA[kNConfigs] = {
6e39bde4 70 0.5112, 0.5112, 0.5112, 0.0786, 0.0786,
41702fec 71 0.0786, 0.0786, 0.0579, 0.0579, 0.0474,
72 0.0474, 0.0408, 0.0335, 0.0335, 0.0335
e165b64b 73};
74const Double_t AliTRDtrackerV1::fgkX0[kNPlanes] = {
75 300.2, 312.8, 325.4, 338.0, 350.6, 363.2};
2985ffcb 76Int_t AliTRDtrackerV1::fgNTimeBins = 0;
4d6aee34 77AliRieman* AliTRDtrackerV1::fgRieman = NULL;
78TLinearFitter* AliTRDtrackerV1::fgTiltedRieman = NULL;
79TLinearFitter* AliTRDtrackerV1::fgTiltedRiemanConstrained = NULL;
e4f2f73d 80
81//____________________________________________________________________
3a039a31 82AliTRDtrackerV1::AliTRDtrackerV1(AliTRDReconstructor *rec)
41702fec 83 :AliTracker()
4d6aee34 84 ,fkReconstructor(NULL)
85 ,fGeom(NULL)
86 ,fClusters(NULL)
87 ,fTracklets(NULL)
88 ,fTracks(NULL)
41702fec 89 ,fSieveSeeding(0)
e4f2f73d 90{
41702fec 91 //
92 // Default constructor.
93 //
eb2b4f91 94
95 SetReconstructor(rec); // initialize reconstructor
96
97 // initialize geometry
98 if(!AliGeomManager::GetGeometry()){
99 AliFatal("Could not get geometry.");
100 }
101 fGeom = new AliTRDgeometry();
102 fGeom->CreateClusterMatrixArray();
4d6aee34 103 TGeoHMatrix *matrix = NULL;
eb2b4f91 104 Double_t loc[] = {0., 0., 0.};
105 Double_t glb[] = {0., 0., 0.};
106 for(Int_t ily=kNPlanes; ily--;){
e165b64b 107 Int_t ism = 0;
108 while(!(matrix = fGeom->GetClusterMatrix(AliTRDgeometry::GetDetector(ily, 2, ism)))) ism++;
109 if(!matrix){
110 AliError(Form("Could not get transformation matrix for layer %d. Use default.", ily));
111 fR[ily] = fgkX0[ily];
eb2b4f91 112 continue;
113 }
114 matrix->LocalToMaster(loc, glb);
115 fR[ily] = glb[0]+ AliTRDgeometry::AnodePos()-.5*AliTRDgeometry::AmThick() - AliTRDgeometry::DrThick();
116 }
117
eb2b4f91 118 // initialize cluster containers
053767a4 119 for (Int_t isector = 0; isector < AliTRDgeometry::kNsector; isector++) new(&fTrSec[isector]) AliTRDtrackingSector(fGeom, isector);
3a039a31 120
eb2b4f91 121 // initialize arrays
122 memset(fTrackQuality, 0, kMaxTracksStack*sizeof(Double_t));
123 memset(fSeedLayer, 0, kMaxTracksStack*sizeof(Int_t));
124 memset(fSeedTB, 0, kNSeedPlanes*sizeof(AliTRDchamberTimeBin*));
eb38ed55 125}
126
e4f2f73d 127//____________________________________________________________________
128AliTRDtrackerV1::~AliTRDtrackerV1()
129{
41702fec 130 //
131 // Destructor
132 //
133
4d6aee34 134 if(fgRieman) delete fgRieman; fgRieman = NULL;
135 if(fgTiltedRieman) delete fgTiltedRieman; fgTiltedRieman = NULL;
136 if(fgTiltedRiemanConstrained) delete fgTiltedRiemanConstrained; fgTiltedRiemanConstrained = NULL;
d611c74f 137 for(Int_t isl =0; isl<kNSeedPlanes; isl++) if(fSeedTB[isl]) delete fSeedTB[isl];
41702fec 138 if(fTracks) {fTracks->Delete(); delete fTracks;}
139 if(fTracklets) {fTracklets->Delete(); delete fTracklets;}
48f8adf3 140 if(fClusters) {
141 fClusters->Delete(); delete fClusters;
142 }
41702fec 143 if(fGeom) delete fGeom;
e4f2f73d 144}
145
146//____________________________________________________________________
147Int_t AliTRDtrackerV1::Clusters2Tracks(AliESDEvent *esd)
148{
41702fec 149 //
150 // Steering stand alone tracking for full TRD detector
151 //
152 // Parameters :
153 // esd : The ESD event. On output it contains
154 // the ESD tracks found in TRD.
155 //
156 // Output :
157 // Number of tracks found in the TRD detector.
158 //
159 // Detailed description
160 // 1. Launch individual SM trackers.
161 // See AliTRDtrackerV1::Clusters2TracksSM() for details.
162 //
163
4d6aee34 164 if(!fkReconstructor->GetRecoParam() ){
3a039a31 165 AliError("Reconstruction configuration not initialized. Call first AliTRDReconstructor::SetRecoParam().");
41702fec 166 return 0;
167 }
168
169 //AliInfo("Start Track Finder ...");
170 Int_t ntracks = 0;
053767a4 171 for(int ism=0; ism<AliTRDgeometry::kNsector; ism++){
41702fec 172 // for(int ism=1; ism<2; ism++){
173 //AliInfo(Form("Processing supermodule %i ...", ism));
174 ntracks += Clusters2TracksSM(ism, esd);
175 }
980d5a2a 176 AliInfo(Form("Number of tracks: !TRDin[%d]", ntracks));
41702fec 177 return ntracks;
e4f2f73d 178}
179
0906e73e 180
181//_____________________________________________________________________________
eb38ed55 182Bool_t AliTRDtrackerV1::GetTrackPoint(Int_t index, AliTrackPoint &p) const
0906e73e 183{
41702fec 184 //AliInfo(Form("Asking for tracklet %d", index));
185
84eab75a 186 // reset position of the point before using it
187 p.SetXYZ(0., 0., 0.);
2f7514a6 188 AliTRDseedV1 *tracklet = GetTracklet(index);
189 if (!tracklet) return kFALSE;
84eab75a 190
41702fec 191 // get detector for this tracklet
e165b64b 192 Int_t det = tracklet->GetDetector();
193 Int_t sec = fGeom->GetSector(det);
194 Double_t alpha = (sec+.5)*AliTRDgeometry::GetAlpha(),
195 sinA = TMath::Sin(alpha),
196 cosA = TMath::Cos(alpha);
41702fec 197 Double_t local[3];
e165b64b 198 local[0] = tracklet->GetX();
199 local[1] = tracklet->GetY();
200 local[2] = tracklet->GetZ();
41702fec 201 Double_t global[3];
e165b64b 202 fGeom->RotateBack(det, local, global);
203
204 Double_t cov2D[3]; Float_t cov[6];
205 tracklet->GetCovAt(local[0], cov2D);
206 cov[0] = cov2D[0]*sinA*sinA;
207 cov[1] =-cov2D[0]*sinA*cosA;
208 cov[2] =-cov2D[1]*sinA;
209 cov[3] = cov2D[0]*cosA*cosA;
210 cov[4] = cov2D[1]*cosA;
211 cov[5] = cov2D[2];
212 // store the global position of the tracklet and its covariance matrix in the track point
213 p.SetXYZ(global[0],global[1],global[2], cov);
41702fec 214
215 // setting volume id
e165b64b 216 AliGeomManager::ELayerID iLayer = AliGeomManager::ELayerID(AliGeomManager::kTRD1+fGeom->GetLayer(det));
217 Int_t modId = fGeom->GetSector(det) * AliTRDgeometry::kNstack + fGeom->GetStack(det);
41702fec 218 UShort_t volid = AliGeomManager::LayerToVolUID(iLayer, modId);
219 p.SetVolumeID(volid);
220
221 return kTRUE;
0906e73e 222}
223
eb38ed55 224//____________________________________________________________________
225TLinearFitter* AliTRDtrackerV1::GetTiltedRiemanFitter()
226{
41702fec 227 if(!fgTiltedRieman) fgTiltedRieman = new TLinearFitter(4, "hyp4");
228 return fgTiltedRieman;
eb38ed55 229}
0906e73e 230
eb38ed55 231//____________________________________________________________________
232TLinearFitter* AliTRDtrackerV1::GetTiltedRiemanFitterConstraint()
233{
41702fec 234 if(!fgTiltedRiemanConstrained) fgTiltedRiemanConstrained = new TLinearFitter(2, "hyp2");
235 return fgTiltedRiemanConstrained;
eb38ed55 236}
41702fec 237
eb38ed55 238//____________________________________________________________________
239AliRieman* AliTRDtrackerV1::GetRiemanFitter()
240{
fac58f00 241 if(!fgRieman) fgRieman = new AliRieman(AliTRDseedV1::kNtb * AliTRDgeometry::kNlayer);
41702fec 242 return fgRieman;
eb38ed55 243}
41702fec 244
0906e73e 245//_____________________________________________________________________________
246Int_t AliTRDtrackerV1::PropagateBack(AliESDEvent *event)
247{
2a3191bb 248// Propagation of ESD tracks from TPC to TOF detectors and building of the TRD track. For building
249// a TRD track an ESD track is used as seed. The informations obtained on the TRD track (measured points,
250// covariance, PID, etc.) are than used to update the corresponding ESD track.
251// Each track seed is first propagated to the geometrical limit of the TRD detector.
252// Its prolongation is searched in the TRD and if corresponding clusters are found tracklets are
253// constructed out of them (see AliTRDseedV1::AttachClusters()) and the track is updated.
254// Otherwise the ESD track is left unchanged.
255//
256// The following steps are performed:
257// 1. Selection of tracks based on the variance in the y-z plane.
258// 2. Propagation to the geometrical limit of the TRD volume. If track propagation fails the AliESDtrack::kTRDStop is set.
259// 3. Prolongation inside the fiducial volume (see AliTRDtrackerV1::FollowBackProlongation()) and marking
260// the following status bits:
261// - AliESDtrack::kTRDin - if the tracks enters the TRD fiducial volume
262// - AliESDtrack::kTRDStop - if the tracks fails propagation
263// - AliESDtrack::kTRDbackup - if the tracks fulfills chi2 conditions and qualify for refitting
264// 4. Writting to friends, PID, MC label, quality etc. Setting status bit AliESDtrack::kTRDout.
265// 5. Propagation to TOF. If track propagation fails the AliESDtrack::kTRDStop is set.
266//
267
268 AliTRDCalibraFillHisto *calibra = AliTRDCalibraFillHisto::Instance(); // Calibration monitor
41702fec 269 if (!calibra) AliInfo("Could not get Calibra instance\n");
828c6f80 270 if(!fgNTimeBins) CookNTimeBins();
271
eb2b4f91 272 // Define scalers
273 Int_t nFound = 0, // number of tracks found
274 nSeeds = 0, // total number of ESD seeds
275 nTRDseeds= 0, // number of seeds in the TRD acceptance
276 nTPCseeds= 0; // number of TPC seeds
41702fec 277 Float_t foundMin = 20.0;
278
4d6aee34 279 Float_t *quality = NULL;
280 Int_t *index = NULL;
eb2b4f91 281 nSeeds = event->GetNumberOfTracks();
282 // Sort tracks according to quality
283 // (covariance in the yz plane)
284 if(nSeeds){
285 quality = new Float_t[nSeeds];
286 index = new Int_t[nSeeds];
287 for (Int_t iSeed = nSeeds; iSeed--;) {
d611c74f 288 AliESDtrack *seed = event->GetTrack(iSeed);
289 Double_t covariance[15];
290 seed->GetExternalCovariance(covariance);
291 quality[iSeed] = covariance[0] + covariance[2];
292 }
eb2b4f91 293 TMath::Sort(nSeeds, quality, index,kFALSE);
41702fec 294 }
41702fec 295
eb2b4f91 296 // Propagate all seeds
41702fec 297 Int_t expectedClr;
298 AliTRDtrackV1 track;
eb2b4f91 299 for (Int_t iSeed = 0; iSeed < nSeeds; iSeed++) {
41702fec 300
301 // Get the seeds in sorted sequence
302 AliESDtrack *seed = event->GetTrack(index[iSeed]);
eb2b4f91 303 Float_t p4 = seed->GetC(seed->GetBz());
41702fec 304
305 // Check the seed status
306 ULong_t status = seed->GetStatus();
307 if ((status & AliESDtrack::kTPCout) == 0) continue;
308 if ((status & AliESDtrack::kTRDout) != 0) continue;
eb2b4f91 309
310 // Propagate to the entrance in the TRD mother volume
41702fec 311 new(&track) AliTRDtrackV1(*seed);
eb2b4f91 312 if(AliTRDgeometry::GetXtrdBeg() > (fgkMaxStep + track.GetX()) && !PropagateToX(track, AliTRDgeometry::GetXtrdBeg(), fgkMaxStep)){
313 seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
314 continue;
315 }
316 if(!AdjustSector(&track)){
317 seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
318 continue;
319 }
320 if(TMath::Abs(track.GetSnp()) > fgkMaxSnp) {
321 seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
322 continue;
323 }
324
325 nTPCseeds++;
e4d4864b 326
eb2b4f91 327 // store track status at TRD entrance
76b60503 328 seed->UpdateTrackParams(&track, AliESDtrack::kTRDbackup);
ae3fbe1f 329
eb2b4f91 330 // prepare track and do propagation in the TRD
4d6aee34 331 track.SetReconstructor(fkReconstructor);
eb2b4f91 332 track.SetKink(Bool_t(seed->GetKinkIndex(0)));
333 expectedClr = FollowBackProlongation(track);
334 // check if track entered the TRD fiducial volume
335 if(track.GetTrackLow()){
336 seed->UpdateTrackParams(&track, AliESDtrack::kTRDin);
337 nTRDseeds++;
338 }
339 // check if track was stopped in the TRD
340 if (expectedClr<0){
341 seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
342 continue;
343 }
ae3fbe1f 344
345 if(expectedClr){
eb2b4f91 346 nFound++;
41702fec 347 // computes PID for track
348 track.CookPID();
349 // update calibration references using this track
350 if(calibra->GetHisto2d()) calibra->UpdateHistogramsV1(&track);
351 // save calibration object
a2fbb6ec 352 if (fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) > 0){
224f357f 353 AliTRDtrackV1 *calibTrack = new AliTRDtrackV1(track);
354 calibTrack->SetOwner();
355 seed->AddCalibObject(calibTrack);
356 }
357 //update ESD track
41702fec 358 if ((track.GetNumberOfClusters() > 15) && (track.GetNumberOfClusters() > 0.5*expectedClr)) {
2389e96f 359 seed->UpdateTrackParams(&track, AliESDtrack::kTRDout);
41702fec 360 track.UpdateESDtrack(seed);
41702fec 361 }
362 }
363
27fbeba8 364 if ((TMath::Abs(track.GetC(track.GetBz()) - p4) / TMath::Abs(p4) < 0.2) ||(track.Pt() > 0.8)) {
e3cf3d02 365
41702fec 366 // Make backup for back propagation
41702fec 367 Int_t foundClr = track.GetNumberOfClusters();
368 if (foundClr >= foundMin) {
41702fec 369 track.CookLabel(1. - fgkLabelFraction);
f29f13a6 370 //if(track.GetBackupTrack()) UseClusters(track.GetBackupTrack());
41702fec 371
372 // Sign only gold tracks
373 if (track.GetChi2() / track.GetNumberOfClusters() < 4) {
f29f13a6 374 //if ((seed->GetKinkIndex(0) == 0) && (track.Pt() < 1.5)) UseClusters(&track);
41702fec 375 }
376 Bool_t isGold = kFALSE;
377
378 // Full gold track
379 if (track.GetChi2() / track.GetNumberOfClusters() < 5) {
380 if (track.GetBackupTrack()) seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup);
381
382 isGold = kTRUE;
383 }
384
385 // Almost gold track
386 if ((!isGold) && (track.GetNCross() == 0) && (track.GetChi2() / track.GetNumberOfClusters() < 7)) {
387 //seed->UpdateTrackParams(track, AliESDtrack::kTRDbackup);
388 if (track.GetBackupTrack()) seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup);
389
390 isGold = kTRUE;
391 }
392
393 if ((!isGold) && (track.GetBackupTrack())) {
394 if ((track.GetBackupTrack()->GetNumberOfClusters() > foundMin) && ((track.GetBackupTrack()->GetChi2()/(track.GetBackupTrack()->GetNumberOfClusters()+1)) < 7)) {
395 seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup);
396 isGold = kTRUE;
397 }
398 }
41702fec 399 }
400 }
401
eb2b4f91 402 // Propagation to the TOF
403 if(!(seed->GetStatus()&AliESDtrack::kTRDStop)) {
404 Int_t sm = track.GetSector();
405 // default value in case we have problems with the geometry.
406 Double_t xtof = 371.;
407 //Calculate radial position of the beginning of the TOF
408 //mother volume. In order to avoid mixing of the TRD
409 //and TOF modules some hard values are needed. This are:
410 //1. The path to the TOF module.
411 //2. The width of the TOF (29.05 cm)
412 //(with the help of Annalisa de Caro Mar-17-2009)
413 if(gGeoManager){
414 gGeoManager->cd(Form("/ALIC_1/B077_1/BSEGMO%d_1/BTOF%d_1", sm, sm));
4d6aee34 415 TGeoHMatrix *m = NULL;
eb2b4f91 416 Double_t loc[]={0., 0., -.5*29.05}, glob[3];
417
418 if((m=gGeoManager->GetCurrentMatrix())){
419 m->LocalToMaster(loc, glob);
420 xtof = TMath::Sqrt(glob[0]*glob[0]+glob[1]*glob[1]);
421 }
41702fec 422 }
672b48bd 423 if(xtof > (fgkMaxStep + track.GetX()) && !PropagateToX(track, xtof, fgkMaxStep)){
424 seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
425 continue;
426 }
427 if(!AdjustSector(&track)){
428 seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
429 continue;
430 }
431 if(TMath::Abs(track.GetSnp()) > fgkMaxSnp){
432 seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
433 continue;
434 }
eb2b4f91 435 seed->UpdateTrackParams(&track, AliESDtrack::kTRDout);
436 // TODO obsolete - delete
437 seed->SetTRDQuality(track.StatusForTOF());
41702fec 438 }
41702fec 439 seed->SetTRDBudget(track.GetBudget(0));
440 }
d611c74f 441 if(index) delete [] index;
442 if(quality) delete [] quality;
41702fec 443
d4cf71ca 444 AliInfo(Form("Number of seeds: TPCout[%d] TRDin[%d]", nTPCseeds, nTRDseeds));
445 AliInfo(Form("Number of tracks: TRDout[%d]", nFound));
446
d611c74f 447 // run stand alone tracking
4d6aee34 448 if (fkReconstructor->IsSeeding()) Clusters2Tracks(event);
41702fec 449
450 return 0;
0906e73e 451}
452
453
454//____________________________________________________________________
455Int_t AliTRDtrackerV1::RefitInward(AliESDEvent *event)
456{
41702fec 457 //
458 // Refits tracks within the TRD. The ESD event is expected to contain seeds
459 // at the outer part of the TRD.
460 // The tracks are propagated to the innermost time bin
461 // of the TRD and the ESD event is updated
462 // Origin: Thomas KUHR (Thomas.Kuhr@cern.ch)
463 //
464
465 Int_t nseed = 0; // contor for loaded seeds
466 Int_t found = 0; // contor for updated TRD tracks
467
468
469 AliTRDtrackV1 track;
470 for (Int_t itrack = 0; itrack < event->GetNumberOfTracks(); itrack++) {
471 AliESDtrack *seed = event->GetTrack(itrack);
472 new(&track) AliTRDtrackV1(*seed);
473
474 if (track.GetX() < 270.0) {
475 seed->UpdateTrackParams(&track, AliESDtrack::kTRDbackup);
476 continue;
477 }
478
e3cf3d02 479 // reject tracks which failed propagation in the TRD or
480 // are produced by the TRD stand alone tracker
41702fec 481 ULong_t status = seed->GetStatus();
e3cf3d02 482 if(!(status & AliESDtrack::kTRDout)) continue;
483 if(!(status & AliESDtrack::kTRDin)) continue;
41702fec 484 nseed++;
485
486 track.ResetCovariance(50.0);
487
488 // do the propagation and processing
489 Bool_t kUPDATE = kFALSE;
490 Double_t xTPC = 250.0;
491 if(FollowProlongation(track)){
492 // Prolongate to TPC
493 if (PropagateToX(track, xTPC, fgkMaxStep)) { // -with update
e3cf3d02 494 seed->UpdateTrackParams(&track, AliESDtrack::kTRDrefit);
495 found++;
496 kUPDATE = kTRUE;
497 }
498
499 // Update the friend track
a2fbb6ec 500 if (fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) > 0){
4d6aee34 501 TObject *o = NULL; Int_t ic = 0;
502 AliTRDtrackV1 *calibTrack = NULL;
e3cf3d02 503 while((o = seed->GetCalibObject(ic++))){
504 if(!(calibTrack = dynamic_cast<AliTRDtrackV1*>(o))) continue;
505 calibTrack->SetTrackHigh(track.GetTrackHigh());
506 }
41702fec 507 }
e3cf3d02 508 }
41702fec 509
510 // Prolongate to TPC without update
511 if(!kUPDATE) {
512 AliTRDtrackV1 tt(*seed);
e3cf3d02 513 if (PropagateToX(tt, xTPC, fgkMaxStep)) seed->UpdateTrackParams(&tt, AliESDtrack::kTRDbackup);
41702fec 514 }
515 }
980d5a2a 516 AliInfo(Form("Number of seeds: TRDout[%d]", nseed));
517 AliInfo(Form("Number of tracks: TRDrefit[%d]", found));
41702fec 518
519 return 0;
0906e73e 520}
521
0906e73e 522//____________________________________________________________________
523Int_t AliTRDtrackerV1::FollowProlongation(AliTRDtrackV1 &t)
524{
41702fec 525 // Extrapolates the TRD track in the TPC direction.
526 //
527 // Parameters
528 // t : the TRD track which has to be extrapolated
529 //
530 // Output
531 // number of clusters attached to the track
532 //
533 // Detailed description
534 //
535 // Starting from current radial position of track <t> this function
536 // extrapolates the track through the 6 TRD layers. The following steps
537 // are being performed for each plane:
538 // 1. prepare track:
539 // a. get plane limits in the local x direction
540 // b. check crossing sectors
541 // c. check track inclination
542 // 2. search tracklet in the tracker list (see GetTracklet() for details)
543 // 3. evaluate material budget using the geo manager
544 // 4. propagate and update track using the tracklet information.
545 //
546 // Debug level 2
547 //
548
e3cf3d02 549 Bool_t kStoreIn = kTRUE;
41702fec 550 Int_t nClustersExpected = 0;
e3cf3d02 551 for (Int_t iplane = kNPlanes; iplane--;) {
17896e82 552 Int_t index(-1);
41702fec 553 AliTRDseedV1 *tracklet = GetTracklet(&t, iplane, index);
17896e82 554 AliDebug(2, Form("Tracklet[%p] ly[%d] idx[%d]", (void*)tracklet, iplane, index));
41702fec 555 if(!tracklet) continue;
980d5a2a 556 if(!tracklet->IsOK()){
557 AliDebug(1, Form("Tracklet Det[%d] !OK", tracklet->GetDetector()));
558 continue;
559 }
e3cf3d02 560 Double_t x = tracklet->GetX();//GetX0();
41702fec 561 // reject tracklets which are not considered for inward refit
562 if(x > t.GetX()+fgkMaxStep) continue;
563
564 // append tracklet to track
565 t.SetTracklet(tracklet, index);
566
567 if (x < (t.GetX()-fgkMaxStep) && !PropagateToX(t, x+fgkMaxStep, fgkMaxStep)) break;
568 if (!AdjustSector(&t)) break;
569
570 // Start global position
571 Double_t xyz0[3];
572 t.GetXYZ(xyz0);
573
574 // End global position
575 Double_t alpha = t.GetAlpha(), y, z;
576 if (!t.GetProlongation(x,y,z)) break;
577 Double_t xyz1[3];
578 xyz1[0] = x * TMath::Cos(alpha) - y * TMath::Sin(alpha);
579 xyz1[1] = x * TMath::Sin(alpha) + y * TMath::Cos(alpha);
580 xyz1[2] = z;
581
51a23065 582 Double_t length = TMath::Sqrt(
583 (xyz0[0]-xyz1[0])*(xyz0[0]-xyz1[0]) +
584 (xyz0[1]-xyz1[1])*(xyz0[1]-xyz1[1]) +
585 (xyz0[2]-xyz1[2])*(xyz0[2]-xyz1[2])
586 );
587 if(length>0.){
588 // Get material budget
589 Double_t param[7];
590 if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param)<=0.) break;
591 Double_t xrho= param[0]*param[4];
592 Double_t xx0 = param[1]; // Get mean propagation parameters
593
594 // Propagate and update
595 t.PropagateTo(x, xx0, xrho);
596 if (!AdjustSector(&t)) break;
597 }
e3cf3d02 598 if(kStoreIn){
599 t.SetTrackHigh();
600 kStoreIn = kFALSE;
601 }
602
b72f4eaf 603 Double_t cov[3]; tracklet->GetCovAt(x, cov);
604 Double_t p[2] = { tracklet->GetY(), tracklet->GetZ()};
605 Double_t chi2 = ((AliExternalTrackParam)t).GetPredictedChi2(p, cov);
606 if (chi2 < 1e+10 && t.Update(p, cov, chi2)){
41702fec 607 nClustersExpected += tracklet->GetN();
608 }
609 }
610
a2fbb6ec 611 if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) > 1){
41702fec 612 Int_t index;
51a23065 613 for(int iplane=0; iplane<AliTRDgeometry::kNlayer; iplane++){
41702fec 614 AliTRDseedV1 *tracklet = GetTracklet(&t, iplane, index);
615 if(!tracklet) continue;
616 t.SetTracklet(tracklet, index);
617 }
618
a2fbb6ec 619 if(fkReconstructor->IsDebugStreaming()){
620 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
621 TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
622 AliTRDtrackV1 track(t);
623 track.SetOwner();
624 cstreamer << "FollowProlongation"
625 << "EventNumber=" << eventNumber
626 << "ncl=" << nClustersExpected
627 << "track.=" << &track
628 << "\n";
629 }
41702fec 630 }
41702fec 631 return nClustersExpected;
0906e73e 632
633}
634
635//_____________________________________________________________________________
636Int_t AliTRDtrackerV1::FollowBackProlongation(AliTRDtrackV1 &t)
637{
afa21247 638// Extrapolates/Build the TRD track in the TOF direction.
639//
640// Parameters
641// t : the TRD track which has to be extrapolated
642//
643// Output
644// number of clusters attached to the track
645//
646// Starting from current radial position of track <t> this function
647// extrapolates the track through the 6 TRD layers. The following steps
648// are being performed for each plane:
649// 1. Propagate track to the entrance of the next chamber:
650// - get chamber limits in the radial direction
651// - check crossing sectors
652// - check track inclination
653// - check track prolongation against boundary conditions (see exclusion boundaries on AliTRDgeometry::IsOnBoundary())
654// 2. Build tracklet (see AliTRDseed::AttachClusters() for details) for this layer if needed. If only
655// Kalman filter is needed and tracklets are already linked to the track this step is skipped.
656// 3. Fit tracklet using the information from the Kalman filter.
657// 4. Propagate and update track at reference radial position of the tracklet.
658// 5. Register tracklet with the tracker and track; update pulls monitoring.
659//
660// Observation
2a3191bb 661// 1. During the propagation a bit map is filled detailing the status of the track in each TRD chamber. The following errors are being registered for each tracklet:
662// - AliTRDtrackV1::kProlongation : track prolongation failed
663// - AliTRDtrackV1::kPropagation : track prolongation failed
664// - AliTRDtrackV1::kAdjustSector : failed during sector crossing
665// - AliTRDtrackV1::kSnp : too large bending
666// - AliTRDtrackV1::kTrackletInit : fail to initialize tracklet
667// - AliTRDtrackV1::kUpdate : fail to attach clusters or fit the tracklet
668// - AliTRDtrackV1::kUnknown : anything which is not covered before
afa21247 669// 2. By default the status of the track before first TRD update is saved.
670//
671// Debug level 2
672//
673// Author
674// Alexandru Bercuci <A.Bercuci@gsi.de>
675//
41702fec 676
eb2b4f91 677 Int_t n = 0;
678 Double_t driftLength = .5*AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick();
4d6aee34 679 AliTRDtrackingChamber *chamber = NULL;
41702fec 680
7c3eecb8 681 Int_t debugLevel = fkReconstructor->IsDebugStreaming() ? fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) : 0;
682 TTreeSRedirector *cstreamer = fkReconstructor->IsDebugStreaming() ? fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker) : 0x0;
683
4d6aee34 684 AliTRDseedV1 tracklet, *ptrTracklet = NULL;
181d2c97 685 // in case of stand alone tracking we store all the pointers to the tracklets in a temporary array
686 AliTRDseedV1 *tracklets[kNPlanes];
687 memset(tracklets, 0, sizeof(AliTRDseedV1 *) * kNPlanes);
688 for(Int_t ip = 0; ip < kNPlanes; ip++){
689 tracklets[ip] = t.GetTracklet(ip);
690 t.UnsetTracklet(ip);
691 }
81a6494d 692 Bool_t kStoreIn = kTRUE, kPropagateIn = kTRUE;
e3cf3d02 693
053767a4 694 // Loop through the TRD layers
4d6aee34 695 TGeoHMatrix *matrix = NULL;
eb2b4f91 696 Double_t x, y, z;
697 for (Int_t ily=0, sm=-1, stk=-1, det=-1; ily < AliTRDgeometry::kNlayer; ily++) {
1bd708e3 698 AliDebug(2, Form("Propagate to x[%d] = %7.2f", ily, fR[ily]));
699
eb2b4f91 700 // rough estimate of the entry point
701 if (!t.GetProlongation(fR[ily], y, z)){
702 n=-1;
703 t.SetStatus(AliTRDtrackV1::kProlongation);
1bd708e3 704 AliDebug(4, Form("Failed Rough Prolongation to ly[%d] x[%7.2f] y[%7.2f] z[%7.2f]", ily, fR[ily], y, z));
eb2b4f91 705 break;
706 }
41702fec 707
eb2b4f91 708 // find sector / stack / detector
709 sm = t.GetSector();
710 // TODO cross check with y value !
711 stk = fGeom->GetStack(z, ily);
712 det = stk>=0 ? AliTRDgeometry::GetDetector(ily, stk, sm) : -1;
4d6aee34 713 matrix = det>=0 ? fGeom->GetClusterMatrix(det) : NULL;
1bd708e3 714 AliDebug(3, Form("Propagate to det[%3d]", det));
eb2b4f91 715
716 // check if supermodule/chamber is installed
717 if( !fGeom->GetSMstatus(sm) ||
718 stk<0. ||
719 fGeom->IsHole(ily, stk, sm) ||
720 !matrix ){
1bd708e3 721 AliDebug(4, Form("Missing Geometry ly[%d]. Guess radial position", ily));
eb2b4f91 722 // propagate to the default radial position
723 if(fR[ily] > (fgkMaxStep + t.GetX()) && !PropagateToX(t, fR[ily], fgkMaxStep)){
724 n=-1;
725 t.SetStatus(AliTRDtrackV1::kPropagation);
1bd708e3 726 AliDebug(4, "Failed Propagation [Missing Geometry]");
41702fec 727 break;
728 }
eb2b4f91 729 if(!AdjustSector(&t)){
730 n=-1;
731 t.SetStatus(AliTRDtrackV1::kAdjustSector);
1bd708e3 732 AliDebug(4, "Failed Adjust Sector [Missing Geometry]");
eb2b4f91 733 break;
734 }
735 if(TMath::Abs(t.GetSnp()) > fgkMaxSnp){
736 n=-1;
737 t.SetStatus(AliTRDtrackV1::kSnp);
1bd708e3 738 AliDebug(4, "Failed Max Snp [Missing Geometry]");
eb2b4f91 739 break;
740 }
741 t.SetStatus(AliTRDtrackV1::kGeometry, ily);
41702fec 742 continue;
743 }
e3cf3d02 744
eb2b4f91 745 // retrieve rotation matrix for the current chamber
746 Double_t loc[] = {AliTRDgeometry::AnodePos()- driftLength, 0., 0.};
747 Double_t glb[] = {0., 0., 0.};
748 matrix->LocalToMaster(loc, glb);
749
750 // Propagate to the radial distance of the current layer
751 x = glb[0] - fgkMaxStep;
752 if(x > (fgkMaxStep + t.GetX()) && !PropagateToX(t, x, fgkMaxStep)){
753 n=-1;
754 t.SetStatus(AliTRDtrackV1::kPropagation);
1bd708e3 755 AliDebug(4, Form("Failed Initial Propagation to x[%7.2f]", x));
eb2b4f91 756 break;
757 }
758 if(!AdjustSector(&t)){
759 n=-1;
760 t.SetStatus(AliTRDtrackV1::kAdjustSector);
1bd708e3 761 AliDebug(4, "Failed Adjust Sector Start");
eb2b4f91 762 break;
763 }
764 if(TMath::Abs(t.GetSnp()) > fgkMaxSnp) {
765 n=-1;
766 t.SetStatus(AliTRDtrackV1::kSnp);
1bd708e3 767 AliDebug(4, Form("Failed Max Snp[%f] MaxSnp[%f]", t.GetSnp(), fgkMaxSnp));
eb2b4f91 768 break;
769 }
4d6aee34 770 Bool_t doRecalculate = kFALSE;
eb2b4f91 771 if(sm != t.GetSector()){
772 sm = t.GetSector();
4d6aee34 773 doRecalculate = kTRUE;
eb2b4f91 774 }
775 if(stk != fGeom->GetStack(z, ily)){
776 stk = fGeom->GetStack(z, ily);
4d6aee34 777 doRecalculate = kTRUE;
eb2b4f91 778 }
4d6aee34 779 if(doRecalculate){
eb2b4f91 780 det = AliTRDgeometry::GetDetector(ily, stk, sm);
781 if(!(matrix = fGeom->GetClusterMatrix(det))){
782 t.SetStatus(AliTRDtrackV1::kGeometry, ily);
1bd708e3 783 AliDebug(4, Form("Failed Geometry Matrix ly[%d]", ily));
eb2b4f91 784 continue;
785 }
786 matrix->LocalToMaster(loc, glb);
787 x = glb[0] - fgkMaxStep;
788 }
789
790 // check if track is well inside fiducial volume
791 if (!t.GetProlongation(x+fgkMaxStep, y, z)) {
792 n=-1;
793 t.SetStatus(AliTRDtrackV1::kProlongation);
1bd708e3 794 AliDebug(4, Form("Failed Prolongation to x[%7.2f] y[%7.2f] z[%7.2f]", x+fgkMaxStep, y, z));
eb2b4f91 795 break;
796 }
797 if(fGeom->IsOnBoundary(det, y, z, .5)){
798 t.SetStatus(AliTRDtrackV1::kBoundary, ily);
1bd708e3 799 AliDebug(4, "Failed Track on Boundary");
eb2b4f91 800 continue;
801 }
802 // mark track as entering the FIDUCIAL volume of TRD
e3cf3d02 803 if(kStoreIn){
804 t.SetTrackLow();
805 kStoreIn = kFALSE;
806 }
b1957d3c 807
eb2b4f91 808 ptrTracklet = tracklets[ily];
809 if(!ptrTracklet){ // BUILD TRACKLET
1bd708e3 810 AliDebug(3, Form("Building tracklet det[%d]", det));
eb2b4f91 811 // check data in supermodule
812 if(!fTrSec[sm].GetNChambers()){
813 t.SetStatus(AliTRDtrackV1::kNoClusters, ily);
1bd708e3 814 AliDebug(4, "Failed NoClusters");
eb2b4f91 815 continue;
816 }
817 if(fTrSec[sm].GetX(ily) < 1.){
818 t.SetStatus(AliTRDtrackV1::kNoClusters, ily);
1bd708e3 819 AliDebug(4, "Failed NoX");
eb2b4f91 820 continue;
821 }
822
823 // check data in chamber
824 if(!(chamber = fTrSec[sm].GetChamber(stk, ily))){
825 t.SetStatus(AliTRDtrackV1::kNoClusters, ily);
1bd708e3 826 AliDebug(4, "Failed No Detector");
eb2b4f91 827 continue;
828 }
4d6aee34 829 if(chamber->GetNClusters() < fgNTimeBins*fkReconstructor->GetRecoParam() ->GetFindableClusters()){
eb2b4f91 830 t.SetStatus(AliTRDtrackV1::kNoClusters, ily);
1bd708e3 831 AliDebug(4, "Failed Not Enough Clusters in Detector");
eb2b4f91 832 continue;
833 }
834 // build tracklet
835 ptrTracklet = new(&tracklet) AliTRDseedV1(det);
4d6aee34 836 ptrTracklet->SetReconstructor(fkReconstructor);
eb2b4f91 837 ptrTracklet->SetKink(t.IsKink());
838 ptrTracklet->SetPadPlane(fGeom->GetPadPlane(ily, stk));
839 ptrTracklet->SetX0(glb[0]+driftLength);
840 if(!tracklet.Init(&t)){
841 n=-1;
842 t.SetStatus(AliTRDtrackV1::kTrackletInit);
1bd708e3 843 AliDebug(4, "Failed Tracklet Init");
eb2b4f91 844 break;
845 }
846 if(!tracklet.AttachClusters(chamber, kTRUE)){
847 t.SetStatus(AliTRDtrackV1::kNoAttach, ily);
7c3eecb8 848 if(debugLevel>3){
849 AliTRDseedV1 trackletCp(*ptrTracklet);
850 UChar_t status(t.GetStatusTRD(ily));
851 (*cstreamer) << "FollowBackProlongation2"
852 <<"status=" << status
853 <<"tracklet.=" << &trackletCp
854 << "\n";
855 }
1bd708e3 856 AliDebug(4, "Failed Attach Clusters");
eb2b4f91 857 continue;
858 }
1bd708e3 859 AliDebug(3, Form("Number of Clusters in Tracklet: %d", tracklet.GetN()));
4d6aee34 860 if(tracklet.GetN() < fgNTimeBins*fkReconstructor->GetRecoParam() ->GetFindableClusters()){
eb2b4f91 861 t.SetStatus(AliTRDtrackV1::kNoClustersTracklet, ily);
7c3eecb8 862 if(debugLevel>3){
863 AliTRDseedV1 trackletCp(*ptrTracklet);
864 UChar_t status(t.GetStatusTRD(ily));
865 (*cstreamer) << "FollowBackProlongation2"
866 <<"status=" << status
867 <<"tracklet.=" << &trackletCp
868 << "\n";
869 }
1bd708e3 870 AliDebug(4, "Failed N Clusters Attached");
eb2b4f91 871 continue;
872 }
873 ptrTracklet->UpdateUsed();
0217fcd0 874 } else AliDebug(2, Form("Use external tracklet ly[%d]", ily));
eb2b4f91 875 // propagate track to the radial position of the tracklet
876 ptrTracklet->UseClusters(); // TODO ? do we need this here ?
877 // fit tracklet no tilt correction
878 if(!ptrTracklet->Fit(kFALSE)){
879 t.SetStatus(AliTRDtrackV1::kNoFit, ily);
1bd708e3 880 AliDebug(4, "Failed Tracklet Fit");
eb2b4f91 881 continue;
882 }
883 x = ptrTracklet->GetX(); //GetX0();
884 if(x > (fgkMaxStep + t.GetX()) && !PropagateToX(t, x, fgkMaxStep)) {
885 n=-1;
886 t.SetStatus(AliTRDtrackV1::kPropagation);
1bd708e3 887 AliDebug(4, Form("Failed Propagation to Tracklet x[%7.2f]", x));
eb2b4f91 888 break;
889 }
890 if(!AdjustSector(&t)) {
891 n=-1;
892 t.SetStatus(AliTRDtrackV1::kAdjustSector);
1bd708e3 893 AliDebug(4, "Failed Adjust Sector");
eb2b4f91 894 break;
41702fec 895 }
eb2b4f91 896 if(TMath::Abs(t.GetSnp()) > fgkMaxSnp) {
897 n=-1;
898 t.SetStatus(AliTRDtrackV1::kSnp);
1bd708e3 899 AliDebug(4, Form("Failed Max Snp[%f] MaxSnp[%f]", t.GetSnp(), fgkMaxSnp));
eb2b4f91 900 break;
901 }
81a6494d 902 if(kPropagateIn){
903 t.SetTrackLow();
904 kPropagateIn = kFALSE;
905 }
b72f4eaf 906 Double_t cov[3]; ptrTracklet->GetCovAt(x, cov);
907 Double_t p[2] = { ptrTracklet->GetY(), ptrTracklet->GetZ()};
908 Double_t chi2 = ((AliExternalTrackParam)t).GetPredictedChi2(p, cov);
6e39bde4 909 // update Kalman with the TRD measurement
b72f4eaf 910 if(chi2>1e+10){ // TODO
eb2b4f91 911 t.SetStatus(AliTRDtrackV1::kChi2, ily);
7c3eecb8 912 if(debugLevel > 2){
913 UChar_t status(t.GetStatusTRD());
914 AliTRDseedV1 trackletCp(*ptrTracklet);
915 AliTRDtrackV1 trackCp(t);
916 trackCp.SetOwner();
917 (*cstreamer) << "FollowBackProlongation1"
918 << "status=" << status
919 << "tracklet.=" << &trackletCp
920 << "track.=" << &trackCp
921 << "\n";
922 }
1bd708e3 923 AliDebug(4, Form("Failed Chi2[%f]", chi2));
eb2b4f91 924 continue;
925 }
b72f4eaf 926 if(!t.Update(p, cov, chi2)) {
eb2b4f91 927 n=-1;
928 t.SetStatus(AliTRDtrackV1::kUpdate);
7c3eecb8 929 if(debugLevel > 2){
930 UChar_t status(t.GetStatusTRD());
931 AliTRDseedV1 trackletCp(*ptrTracklet);
932 AliTRDtrackV1 trackCp(t);
933 trackCp.SetOwner();
934 (*cstreamer) << "FollowBackProlongation1"
935 << "status=" << status
936 << "tracklet.=" << &trackletCp
937 << "track.=" << &trackCp
938 << "\n";
939 }
1bd708e3 940 AliDebug(4, Form("Failed Track Update @ y[%7.2f] z[%7.2f] s2y[%f] s2z[%f] covyz[%f]", p[0], p[1], cov[0], cov[2], cov[1]));
eb2b4f91 941 break;
942 }
b72f4eaf 943 // fill residuals ?!
944 AliTracker::FillResiduals(&t, p, cov, ptrTracklet->GetVolumeId());
945
eb2b4f91 946
947 // load tracklet to the tracker
16cca13f 948 ptrTracklet->Update(&t);
eb2b4f91 949 ptrTracklet = SetTracklet(ptrTracklet);
17896e82 950 Int_t index(fTracklets->GetEntriesFast()-1);
951 t.SetTracklet(ptrTracklet, index);
eb2b4f91 952 n += ptrTracklet->GetN();
17896e82 953 AliDebug(2, Form("Setting Tracklet[%d] @ Idx[%d]", ily, index));
eb2b4f91 954
41702fec 955 // Reset material budget if 2 consecutive gold
eb2b4f91 956// if(ilayer>0 && t.GetTracklet(ilayer-1) && ptrTracklet->GetN() + t.GetTracklet(ilayer-1)->GetN() > 20) t.SetBudget(2, 0.);
41702fec 957
958 // Make backup of the track until is gold
959 // TO DO update quality check of the track.
960 // consider comparison with fTimeBinsRange
961 Float_t ratio0 = ptrTracklet->GetN() / Float_t(fgNTimeBins);
962 //Float_t ratio1 = Float_t(t.GetNumberOfClusters()+1) / Float_t(t.GetNExpected()+1);
41702fec 963
eb2b4f91 964 if( (chi2 < 18.0) &&
41702fec 965 (ratio0 > 0.8) &&
966 //(ratio1 > 0.6) &&
967 //(ratio0+ratio1 > 1.5) &&
968 (t.GetNCross() == 0) &&
969 (TMath::Abs(t.GetSnp()) < 0.85) &&
e3cf3d02 970 (t.GetNumberOfClusters() > 20)){
971 t.MakeBackupTrack();
972 }
053767a4 973 } // end layers loop
eb2b4f91 974 //printf("clusters[%d] chi2[%f] x[%f] status[%d ", n, t.GetChi2(), t.GetX(), t.GetStatusTRD());
975 //for(int i=0; i<6; i++) printf("%d ", t.GetStatusTRD(i)); printf("]\n");
41702fec 976
7c3eecb8 977 if(debugLevel > 1){
41702fec 978 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
eb2b4f91 979 AliTRDtrackV1 track(t);
980 track.SetOwner();
7c3eecb8 981 (*cstreamer) << "FollowBackProlongation0"
eb2b4f91 982 << "EventNumber=" << eventNumber
983 << "ncl=" << n
984 << "track.=" << &track
41702fec 985 << "\n";
986 }
987
eb2b4f91 988 return n;
0906e73e 989}
990
eb38ed55 991//_________________________________________________________________________
4d6aee34 992Float_t AliTRDtrackerV1::FitRieman(AliTRDseedV1 *tracklets, Double_t *chi2, Int_t *const planes){
41702fec 993 //
994 // Fits a Riemann-circle to the given points without tilting pad correction.
995 // The fit is performed using an instance of the class AliRieman (equations
996 // and transformations see documentation of this class)
997 // Afterwards all the tracklets are Updated
998 //
999 // Parameters: - Array of tracklets (AliTRDseedV1)
1000 // - Storage for the chi2 values (beginning with direction z)
1001 // - Seeding configuration
1002 // Output: - The curvature
1003 //
1004 AliRieman *fitter = AliTRDtrackerV1::GetRiemanFitter();
1005 fitter->Reset();
1006 Int_t allplanes[] = {0, 1, 2, 3, 4, 5};
1007 Int_t *ppl = &allplanes[0];
1008 Int_t maxLayers = 6;
1009 if(planes){
1010 maxLayers = 4;
1011 ppl = planes;
1012 }
1013 for(Int_t il = 0; il < maxLayers; il++){
1014 if(!tracklets[ppl[il]].IsOK()) continue;
e3cf3d02 1015 fitter->AddPoint(tracklets[ppl[il]].GetX0(), tracklets[ppl[il]].GetYfit(0), tracklets[ppl[il]].GetZfit(0),1,10);
41702fec 1016 }
1017 fitter->Update();
1018 // Set the reference position of the fit and calculate the chi2 values
1019 memset(chi2, 0, sizeof(Double_t) * 2);
1020 for(Int_t il = 0; il < maxLayers; il++){
1021 // Reference positions
1022 tracklets[ppl[il]].Init(fitter);
1023
1024 // chi2
1025 if((!tracklets[ppl[il]].IsOK()) && (!planes)) continue;
1026 chi2[0] += tracklets[ppl[il]].GetChi2Y();
1027 chi2[1] += tracklets[ppl[il]].GetChi2Z();
1028 }
1029 return fitter->GetC();
eb38ed55 1030}
1031
1032//_________________________________________________________________________
1033void AliTRDtrackerV1::FitRieman(AliTRDcluster **seedcl, Double_t chi2[2])
1034{
41702fec 1035 //
1036 // Performs a Riemann helix fit using the seedclusters as spacepoints
1037 // Afterwards the chi2 values are calculated and the seeds are updated
1038 //
1039 // Parameters: - The four seedclusters
1040 // - The tracklet array (AliTRDseedV1)
1041 // - The seeding configuration
1042 // - Chi2 array
1043 //
1044 // debug level 2
1045 //
1046 AliRieman *fitter = AliTRDtrackerV1::GetRiemanFitter();
1047 fitter->Reset();
a3743898 1048 for(Int_t i = 0; i < 4; i++){
a3743898 1049 fitter->AddPoint(seedcl[i]->GetX(), seedcl[i]->GetY(), seedcl[i]->GetZ(), 1., 10.);
1050 }
41702fec 1051 fitter->Update();
1052
1053
1054 // Update the seed and calculated the chi2 value
1055 chi2[0] = 0; chi2[1] = 0;
1056 for(Int_t ipl = 0; ipl < kNSeedPlanes; ipl++){
1057 // chi2
1058 chi2[0] += (seedcl[ipl]->GetZ() - fitter->GetZat(seedcl[ipl]->GetX())) * (seedcl[ipl]->GetZ() - fitter->GetZat(seedcl[ipl]->GetX()));
1059 chi2[1] += (seedcl[ipl]->GetY() - fitter->GetYat(seedcl[ipl]->GetX())) * (seedcl[ipl]->GetY() - fitter->GetYat(seedcl[ipl]->GetX()));
1060 }
eb38ed55 1061}
1062
1063
1064//_________________________________________________________________________
1065Float_t AliTRDtrackerV1::FitTiltedRiemanConstraint(AliTRDseedV1 *tracklets, Double_t zVertex)
1066{
41702fec 1067 //
1068 // Fits a helix to the clusters. Pad tilting is considered. As constraint it is
1069 // assumed that the vertex position is set to 0.
1070 // This method is very usefull for high-pt particles
1071 // Basis for the fit: (x - x0)^2 + (y - y0)^2 - R^2 = 0
1072 // x0, y0: Center of the circle
1073 // Measured y-position: ymeas = y - tan(phiT)(zc - zt)
1074 // zc: center of the pad row
1075 // Equation which has to be fitted (after transformation):
1076 // a + b * u + e * v + 2*(ymeas + tan(phiT)(z - zVertex))*t = 0
1077 // Transformation:
1078 // t = 1/(x^2 + y^2)
1079 // u = 2 * x * t
1080 // v = 2 * x * tan(phiT) * t
1081 // Parameters in the equation:
1082 // a = -1/y0, b = x0/y0, e = dz/dx
1083 //
1084 // The Curvature is calculated by the following equation:
1085 // - curv = a/Sqrt(b^2 + 1) = 1/R
1086 // Parameters: - the 6 tracklets
1087 // - the Vertex constraint
1088 // Output: - the Chi2 value of the track
1089 //
1090 // debug level 5
1091 //
1092
1093 TLinearFitter *fitter = GetTiltedRiemanFitterConstraint();
1094 fitter->StoreData(kTRUE);
1095 fitter->ClearPoints();
4d6aee34 1096 AliTRDcluster *cl = NULL;
41702fec 1097
1098 Float_t x, y, z, w, t, error, tilt;
1099 Double_t uvt[2];
1100 Int_t nPoints = 0;
053767a4 1101 for(Int_t ilr = 0; ilr < AliTRDgeometry::kNlayer; ilr++){
1102 if(!tracklets[ilr].IsOK()) continue;
8d2bec9e 1103 for(Int_t itb = 0; itb < AliTRDseedV1::kNclusters; itb++){
053767a4 1104 if(!tracklets[ilr].IsUsable(itb)) continue;
1105 cl = tracklets[ilr].GetClusters(itb);
1742f24c 1106 if(!cl->IsInChamber()) continue;
41702fec 1107 x = cl->GetX();
1108 y = cl->GetY();
1109 z = cl->GetZ();
053767a4 1110 tilt = tracklets[ilr].GetTilt();
41702fec 1111 // Transformation
1112 t = 1./(x * x + y * y);
1113 uvt[0] = 2. * x * t;
1114 uvt[1] = 2. * x * t * tilt ;
1115 w = 2. * (y + tilt * (z - zVertex)) * t;
78b7d24c 1116 error = 2. * TMath::Sqrt(cl->GetSigmaY2()+tilt*tilt*cl->GetSigmaZ2()) * t;
41702fec 1117 fitter->AddPoint(uvt, w, error);
1118 nPoints++;
1119 }
1120 }
e17f4785 1121 fitter->Eval();
41702fec 1122
1123 // Calculate curvature
1124 Double_t a = fitter->GetParameter(0);
1125 Double_t b = fitter->GetParameter(1);
1126 Double_t curvature = a/TMath::Sqrt(b*b + 1);
1127
1128 Float_t chi2track = fitter->GetChisquare()/Double_t(nPoints);
1129 for(Int_t ip = 0; ip < AliTRDtrackerV1::kNPlanes; ip++)
e3cf3d02 1130 tracklets[ip].SetC(curvature);
41702fec 1131
a2fbb6ec 1132/* if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker()) >= 5){
41702fec 1133 //Linear Model on z-direction
1134 Double_t xref = CalculateReferenceX(tracklets); // Relative to the middle of the stack
1135 Double_t slope = fitter->GetParameter(2);
1136 Double_t zref = slope * xref;
1137 Float_t chi2Z = CalculateChi2Z(tracklets, zref, slope, xref);
1138 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
1139 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
4d6aee34 1140 TTreeSRedirector &treeStreamer = *fkReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
41702fec 1141 treeStreamer << "FitTiltedRiemanConstraint"
1142 << "EventNumber=" << eventNumber
1143 << "CandidateNumber=" << candidateNumber
1144 << "Curvature=" << curvature
1145 << "Chi2Track=" << chi2track
1146 << "Chi2Z=" << chi2Z
1147 << "zref=" << zref
1148 << "\n";
3a039a31 1149 }*/
41702fec 1150 return chi2track;
eb38ed55 1151}
1152
1153//_________________________________________________________________________
1154Float_t AliTRDtrackerV1::FitTiltedRieman(AliTRDseedV1 *tracklets, Bool_t sigError)
1155{
41702fec 1156 //
1157 // Performs a Riemann fit taking tilting pad correction into account
1158 // The equation of a Riemann circle, where the y position is substituted by the
1159 // measured y-position taking pad tilting into account, has to be transformed
1160 // into a 4-dimensional hyperplane equation
1161 // Riemann circle: (x-x0)^2 + (y-y0)^2 -R^2 = 0
1162 // Measured y-Position: ymeas = y - tan(phiT)(zc - zt)
1163 // zc: center of the pad row
1164 // zt: z-position of the track
1165 // The z-position of the track is assumed to be linear dependent on the x-position
1166 // Transformed equation: a + b * u + c * t + d * v + e * w - 2 * (ymeas + tan(phiT) * zc) * t = 0
1167 // Transformation: u = 2 * x * t
1168 // v = 2 * tan(phiT) * t
1169 // w = 2 * tan(phiT) * (x - xref) * t
1170 // t = 1 / (x^2 + ymeas^2)
1171 // Parameters: a = -1/y0
1172 // b = x0/y0
1173 // c = (R^2 -x0^2 - y0^2)/y0
1174 // d = offset
1175 // e = dz/dx
1176 // If the offset respectively the slope in z-position is impossible, the parameters are fixed using
1177 // results from the simple riemann fit. Afterwards the fit is redone.
1178 // The curvature is calculated according to the formula:
1179 // curv = a/(1 + b^2 + c*a) = 1/R
1180 //
1181 // Paramters: - Array of tracklets (connected to the track candidate)
1182 // - Flag selecting the error definition
1183 // Output: - Chi2 values of the track (in Parameter list)
1184 //
1185 TLinearFitter *fitter = GetTiltedRiemanFitter();
1186 fitter->StoreData(kTRUE);
1187 fitter->ClearPoints();
1188 AliTRDLeastSquare zfitter;
4d6aee34 1189 AliTRDcluster *cl = NULL;
41702fec 1190
1191 Double_t xref = CalculateReferenceX(tracklets);
6e39bde4 1192 Double_t x, y, z, t, tilt, dx, w, we, erry, errz;
1193 Double_t uvt[4], sumPolY[5], sumPolZ[3];
1194 memset(sumPolY, 0, sizeof(Double_t) * 5);
1195 memset(sumPolZ, 0, sizeof(Double_t) * 3);
41702fec 1196 Int_t nPoints = 0;
1197 // Containers for Least-square fitter
1198 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1199 if(!tracklets[ipl].IsOK()) continue;
ed15ef4f 1200 tilt = tracklets[ipl].GetTilt();
8d2bec9e 1201 for(Int_t itb = 0; itb < AliTRDseedV1::kNclusters; itb++){
41702fec 1202 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1742f24c 1203 if(!cl->IsInChamber()) continue;
41702fec 1204 if (!tracklets[ipl].IsUsable(itb)) continue;
1205 x = cl->GetX();
1206 y = cl->GetY();
1207 z = cl->GetZ();
41702fec 1208 dx = x - xref;
1209 // Transformation
1210 t = 1./(x*x + y*y);
1211 uvt[0] = 2. * x * t;
1212 uvt[1] = t;
1213 uvt[2] = 2. * tilt * t;
1214 uvt[3] = 2. * tilt * dx * t;
1215 w = 2. * (y + tilt*z) * t;
1216 // error definition changes for the different calls
1217 we = 2. * t;
78b7d24c 1218 we *= sigError ? TMath::Sqrt(cl->GetSigmaY2()+tilt*tilt*cl->GetSigmaZ2()) : 0.2;
41702fec 1219 fitter->AddPoint(uvt, w, we);
1220 zfitter.AddPoint(&x, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
6e39bde4 1221 // adding points for covariance matrix estimation
1222 erry = 1./(TMath::Sqrt(cl->GetSigmaY2()) + 0.1); // 0.1 is a systematic error (due to misalignment and miscalibration)
1223 erry *= erry;
1224 errz = 1./cl->GetSigmaZ2();
1225 for(Int_t ipol = 0; ipol < 5; ipol++){
1226 sumPolY[ipol] += erry;
1227 erry *= x;
1228 if(ipol < 3){
1229 sumPolZ[ipol] += errz;
1230 errz *= x;
1231 }
1232 }
41702fec 1233 nPoints++;
1234 }
1235 }
e17f4785 1236 fitter->Eval();
41702fec 1237 zfitter.Eval();
1238
1239 Double_t offset = fitter->GetParameter(3);
1240 Double_t slope = fitter->GetParameter(4);
1241
1242 // Linear fitter - not possible to make boundaries
1243 // Do not accept non possible z and dzdx combinations
1244 Bool_t acceptablez = kTRUE;
1245 Double_t zref = 0.0;
1246 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
1247 if(!tracklets[iLayer].IsOK()) continue;
1248 zref = offset + slope * (tracklets[iLayer].GetX0() - xref);
e3cf3d02 1249 if (TMath::Abs(tracklets[iLayer].GetZfit(0) - zref) > tracklets[iLayer].GetPadLength() * 0.5 + 1.0)
41702fec 1250 acceptablez = kFALSE;
1251 }
1252 if (!acceptablez) {
1253 Double_t dzmf = zfitter.GetFunctionParameter(1);
1254 Double_t zmf = zfitter.GetFunctionValue(&xref);
1255 fgTiltedRieman->FixParameter(3, zmf);
1256 fgTiltedRieman->FixParameter(4, dzmf);
e17f4785 1257 fitter->Eval();
41702fec 1258 fitter->ReleaseParameter(3);
1259 fitter->ReleaseParameter(4);
1260 offset = fitter->GetParameter(3);
1261 slope = fitter->GetParameter(4);
1262 }
1263
1264 // Calculate Curvarture
1265 Double_t a = fitter->GetParameter(0);
1266 Double_t b = fitter->GetParameter(1);
1267 Double_t c = fitter->GetParameter(2);
1268 Double_t curvature = 1.0 + b*b - c*a;
1269 if (curvature > 0.0)
1270 curvature = a / TMath::Sqrt(curvature);
1271
1272 Double_t chi2track = fitter->GetChisquare()/Double_t(nPoints);
1273
6e39bde4 1274 // Prepare error calculation
1275 TMatrixD covarPolY(3,3);
1276 covarPolY(0,0) = sumPolY[0]; covarPolY(1,1) = sumPolY[2]; covarPolY(2,2) = sumPolY[4];
1277 covarPolY(0,1) = covarPolY(1,0) = sumPolY[1];
1278 covarPolY(0,2) = covarPolY(2,0) = sumPolY[2];
1279 covarPolY(2,1) = covarPolY(1,2) = sumPolY[3];
1280 covarPolY.Invert();
1281 TMatrixD covarPolZ(2,2);
1282 covarPolZ(0,0) = sumPolZ[0]; covarPolZ(1,1) = sumPolZ[2];
1283 covarPolZ(1,0) = covarPolZ(0,1) = sumPolZ[1];
1284 covarPolZ.Invert();
1285
41702fec 1286 // Update the tracklets
6e39bde4 1287 Double_t x1, dy, dz;
1288 Double_t cov[15];
1289 memset(cov, 0, sizeof(Double_t) * 15);
41702fec 1290 for(Int_t iLayer = 0; iLayer < AliTRDtrackerV1::kNPlanes; iLayer++) {
1291
1292 x = tracklets[iLayer].GetX0();
6e39bde4 1293 x1 = x - xref;
41702fec 1294 y = 0;
1295 z = 0;
1296 dy = 0;
1297 dz = 0;
6e39bde4 1298 memset(cov, 0, sizeof(Double_t) * 3);
1299 TMatrixD transform(3,3);
1300 transform(0,0) = 1;
1301 transform(0,1) = x;
1302 transform(0,2) = x*x;
1303 transform(1,1) = 1;
1304 transform(1,2) = x;
1305 transform(2,2) = 1;
1306 TMatrixD covariance(transform, TMatrixD::kMult, covarPolY);
1307 covariance *= transform.T();
1308 TMatrixD transformZ(2,2);
1309 transformZ(0,0) = transformZ(1,1) = 1;
1310 transformZ(0,1) = x;
1311 TMatrixD covarZ(transformZ, TMatrixD::kMult, covarPolZ);
1312 covarZ *= transformZ.T();
41702fec 1313 // y: R^2 = (x - x0)^2 + (y - y0)^2
1314 // => y = y0 +/- Sqrt(R^2 - (x - x0)^2)
1315 // R = Sqrt() = 1/Curvature
1316 // => y = y0 +/- Sqrt(1/Curvature^2 - (x - x0)^2)
1317 Double_t res = (x * a + b); // = (x - x0)/y0
1318 res *= res;
1319 res = 1.0 - c * a + b * b - res; // = (R^2 - (x - x0)^2)/y0^2
1320 if (res >= 0) {
1321 res = TMath::Sqrt(res);
1322 y = (1.0 - res) / a;
1323 }
6e39bde4 1324 cov[0] = covariance(0,0);
1325 cov[2] = covarZ(0,0);
1326 cov[1] = 0.;
41702fec 1327
1328 // dy: R^2 = (x - x0)^2 + (y - y0)^2
1329 // => y = +/- Sqrt(R^2 - (x - x0)^2) + y0
1330 // => dy/dx = (x - x0)/Sqrt(R^2 - (x - x0)^2)
1331 // Curvature: cr = 1/R = a/Sqrt(1 + b^2 - c*a)
1332 // => dy/dx = (x - x0)/(1/(cr^2) - (x - x0)^2)
1333 Double_t x0 = -b / a;
1334 if (-c * a + b * b + 1 > 0) {
1335 if (1.0/(curvature * curvature) - (x - x0) * (x - x0) > 0.0) {
6e39bde4 1336 Double_t yderiv = (x - x0) / TMath::Sqrt(1.0/(curvature * curvature) - (x - x0) * (x - x0));
1337 if (a < 0) yderiv *= -1.0;
1338 dy = yderiv;
41702fec 1339 }
1340 }
1341 z = offset + slope * (x - xref);
1342 dz = slope;
1343 tracklets[iLayer].SetYref(0, y);
1344 tracklets[iLayer].SetYref(1, dy);
1345 tracklets[iLayer].SetZref(0, z);
1346 tracklets[iLayer].SetZref(1, dz);
1347 tracklets[iLayer].SetC(curvature);
6e39bde4 1348 tracklets[iLayer].SetCovRef(cov);
41702fec 1349 tracklets[iLayer].SetChi2(chi2track);
1350 }
1351
a2fbb6ec 1352/* if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) >=5){
1353 TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
41702fec 1354 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
1355 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
1356 Double_t chi2z = CalculateChi2Z(tracklets, offset, slope, xref);
1357 cstreamer << "FitTiltedRieman0"
1358 << "EventNumber=" << eventNumber
1359 << "CandidateNumber=" << candidateNumber
1360 << "xref=" << xref
1361 << "Chi2Z=" << chi2z
1362 << "\n";
3a039a31 1363 }*/
41702fec 1364 return chi2track;
eb38ed55 1365}
1366
3b57a3f7 1367
9e333711 1368//____________________________________________________________________
6e4d4425 1369Double_t AliTRDtrackerV1::FitLine(const AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t err, Int_t np, AliTrackPoint *points)
9e333711 1370{
4d6aee34 1371 //
1372 // Fit track with a staight line
1373 // Fills an AliTrackPoint array with np points
1374 // Function should be used to refit tracks when no magnetic field was on
1375 //
9e333711 1376 AliTRDLeastSquare yfitter, zfitter;
4d6aee34 1377 AliTRDcluster *cl = NULL;
9e333711 1378
4d6aee34 1379 AliTRDseedV1 work[kNPlanes], *tracklet = NULL;
9e333711 1380 if(!tracklets){
1381 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1382 if(!(tracklet = track->GetTracklet(ipl))) continue;
1383 if(!tracklet->IsOK()) continue;
1384 new(&work[ipl]) AliTRDseedV1(*tracklet);
1385 }
1386 tracklets = &work[0];
1387 }
1388
1389 Double_t xref = CalculateReferenceX(tracklets);
1390 Double_t x, y, z, dx, ye, yr, tilt;
1391 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1392 if(!tracklets[ipl].IsOK()) continue;
1393 for(Int_t itb = 0; itb < fgNTimeBins; itb++){
1394 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1395 if (!tracklets[ipl].IsUsable(itb)) continue;
1396 x = cl->GetX();
1397 z = cl->GetZ();
1398 dx = x - xref;
1399 zfitter.AddPoint(&dx, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
1400 }
1401 }
1402 zfitter.Eval();
1403 Double_t z0 = zfitter.GetFunctionParameter(0);
1404 Double_t dzdx = zfitter.GetFunctionParameter(1);
1405 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1406 if(!tracklets[ipl].IsOK()) continue;
1407 for(Int_t itb = 0; itb < fgNTimeBins; itb++){
1408 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1409 if (!tracklets[ipl].IsUsable(itb)) continue;
1410 x = cl->GetX();
1411 y = cl->GetY();
1412 z = cl->GetZ();
1413 tilt = tracklets[ipl].GetTilt();
1414 dx = x - xref;
1415 yr = y + tilt*(z - z0 - dzdx*dx);
1416 // error definition changes for the different calls
1417 ye = tilt*TMath::Sqrt(cl->GetSigmaZ2());
1418 ye += err ? tracklets[ipl].GetSigmaY() : 0.2;
1419 yfitter.AddPoint(&dx, yr, ye);
1420 }
1421 }
1422 yfitter.Eval();
1423 Double_t y0 = yfitter.GetFunctionParameter(0);
1424 Double_t dydx = yfitter.GetFunctionParameter(1);
1425 Double_t chi2 = 0.;//yfitter.GetChisquare()/Double_t(nPoints);
1426
1427 //update track points array
1428 if(np && points){
1429 Float_t xyz[3];
1430 for(int ip=0; ip<np; ip++){
1431 points[ip].GetXYZ(xyz);
1432 xyz[1] = y0 + dydx * (xyz[0] - xref);
1433 xyz[2] = z0 + dzdx * (xyz[0] - xref);
1434 points[ip].SetXYZ(xyz);
1435 }
1436 }
1437 return chi2;
1438}
1439
1440
3b57a3f7 1441//_________________________________________________________________________
6e4d4425 1442Double_t AliTRDtrackerV1::FitRiemanTilt(const AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t sigError, Int_t np, AliTrackPoint *points)
3b57a3f7 1443{
0fa1a8ee 1444//
1445// Performs a Riemann fit taking tilting pad correction into account
1446//
1447// Paramters: - Array of tracklets (connected to the track candidate)
1448// - Flag selecting the error definition
1449// Output: - Chi2 values of the track (in Parameter list)
1450//
1451// The equations which has to be solved simultaneously are:
1452// BEGIN_LATEX
1453// R^{2} = (x-x_{0})^{2} + (y^{*}-y_{0})^{2}
1454// y^{*} = y - tg(h)(z - z_{t})
1455// z_{t} = z_{0}+dzdx*(x-x_{r})
1456// END_LATEX
1457// with (x, y, z) the coordinate of the cluster, (x_0, y_0, z_0) the coordinate of the center of the Riemann circle,
1458// R its radius, x_r a constant refrence radial position in the middle of the TRD stack and dzdx the slope of the
1459// track in the x-z plane. Using the following transformations
1460// BEGIN_LATEX
1461// t = 1 / (x^{2} + y^{2})
1462// u = 2 * x * t
1463// v = 2 * tan(h) * t
1464// w = 2 * tan(h) * (x - x_{r}) * t
1465// END_LATEX
1466// One gets the following linear equation
1467// BEGIN_LATEX
1468// a + b * u + c * t + d * v + e * w = 2 * (y + tg(h) * z) * t
1469// END_LATEX
1470// where the coefficients have the following meaning
1471// BEGIN_LATEX
1472// a = -1/y_{0}
1473// b = x_{0}/y_{0}
1474// c = (R^{2} -x_{0}^{2} - y_{0}^{2})/y_{0}
1475// d = z_{0}
1476// e = dz/dx
1477// END_LATEX
1478// The error calculation for the free term is thus
1479// BEGIN_LATEX
1480// #sigma = 2 * #sqrt{#sigma^{2}_{y} + (tilt corr ...) + tg^{2}(h) * #sigma^{2}_{z}} * t
1481// END_LATEX
1482//
1483// From this simple model one can compute chi^2 estimates and a rough approximation of pt from the curvature according
1484// to the formula:
1485// BEGIN_LATEX
1486// C = 1/R = a/(1 + b^{2} + c*a)
1487// END_LATEX
1488//
1489// Authors
1490// M.Ivanov <M.Ivanov@gsi.de>
1491// A.Bercuci <A.Bercuci@gsi.de>
1492// M.Fasel <M.Fasel@gsi.de>
1493
41702fec 1494 TLinearFitter *fitter = GetTiltedRiemanFitter();
1495 fitter->StoreData(kTRUE);
1496 fitter->ClearPoints();
1497 AliTRDLeastSquare zfitter;
4d6aee34 1498 AliTRDcluster *cl = NULL;
3b57a3f7 1499
4d6aee34 1500 AliTRDseedV1 work[kNPlanes], *tracklet = NULL;
3b57a3f7 1501 if(!tracklets){
1502 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1503 if(!(tracklet = track->GetTracklet(ipl))) continue;
1504 if(!tracklet->IsOK()) continue;
1505 new(&work[ipl]) AliTRDseedV1(*tracklet);
1506 }
1507 tracklets = &work[0];
1508 }
1509
41702fec 1510 Double_t xref = CalculateReferenceX(tracklets);
1511 Double_t x, y, z, t, tilt, dx, w, we;
1512 Double_t uvt[4];
1513 Int_t nPoints = 0;
1514 // Containers for Least-square fitter
1515 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1516 if(!tracklets[ipl].IsOK()) continue;
8d2bec9e 1517 for(Int_t itb = 0; itb < AliTRDseedV1::kNclusters; itb++){
41702fec 1518 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1519 if (!tracklets[ipl].IsUsable(itb)) continue;
1520 x = cl->GetX();
1521 y = cl->GetY();
1522 z = cl->GetZ();
1523 tilt = tracklets[ipl].GetTilt();
1524 dx = x - xref;
1525 // Transformation
1526 t = 1./(x*x + y*y);
1527 uvt[0] = 2. * x * t;
1528 uvt[1] = t;
1529 uvt[2] = 2. * tilt * t;
1530 uvt[3] = 2. * tilt * dx * t;
1531 w = 2. * (y + tilt*z) * t;
1532 // error definition changes for the different calls
1533 we = 2. * t;
f29f13a6 1534 we *= sigError ? TMath::Sqrt(cl->GetSigmaY2()) : 0.2;
41702fec 1535 fitter->AddPoint(uvt, w, we);
1536 zfitter.AddPoint(&x, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
1537 nPoints++;
1538 }
1539 }
aec26713 1540 if(fitter->Eval()) return 1.E10;
1541
41702fec 1542 Double_t z0 = fitter->GetParameter(3);
1543 Double_t dzdx = fitter->GetParameter(4);
3b57a3f7 1544
1545
1546 // Linear fitter - not possible to make boundaries
1547 // Do not accept non possible z and dzdx combinations
1548 Bool_t accept = kTRUE;
1549 Double_t zref = 0.0;
1550 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
1551 if(!tracklets[iLayer].IsOK()) continue;
1552 zref = z0 + dzdx * (tracklets[iLayer].GetX0() - xref);
e3cf3d02 1553 if (TMath::Abs(tracklets[iLayer].GetZfit(0) - zref) > tracklets[iLayer].GetPadLength() * 0.5 + 1.0)
3b57a3f7 1554 accept = kFALSE;
1555 }
1556 if (!accept) {
41702fec 1557 zfitter.Eval();
3b57a3f7 1558 Double_t dzmf = zfitter.GetFunctionParameter(1);
1559 Double_t zmf = zfitter.GetFunctionValue(&xref);
1560 fitter->FixParameter(3, zmf);
1561 fitter->FixParameter(4, dzmf);
e17f4785 1562 fitter->Eval();
3b57a3f7 1563 fitter->ReleaseParameter(3);
1564 fitter->ReleaseParameter(4);
1565 z0 = fitter->GetParameter(3); // = zmf ?
1566 dzdx = fitter->GetParameter(4); // = dzmf ?
1567 }
1568
1569 // Calculate Curvature
1570 Double_t a = fitter->GetParameter(0);
1571 Double_t b = fitter->GetParameter(1);
1572 Double_t c = fitter->GetParameter(2);
1573 Double_t y0 = 1. / a;
1574 Double_t x0 = -b * y0;
a015e406 1575 Double_t tmp = y0*y0 + x0*x0 - c*y0;
1576 if(tmp<=0.) return 1.E10;
4d6aee34 1577 Double_t radius = TMath::Sqrt(tmp);
1578 Double_t curvature = 1.0 + b*b - c*a;
1579 if (curvature > 0.0) curvature = a / TMath::Sqrt(curvature);
3b57a3f7 1580
1581 // Calculate chi2 of the fit
1582 Double_t chi2 = fitter->GetChisquare()/Double_t(nPoints);
1583
1584 // Update the tracklets
1585 if(!track){
1586 for(Int_t ip = 0; ip < kNPlanes; ip++) {
1587 x = tracklets[ip].GetX0();
4d6aee34 1588 tmp = radius*radius-(x-x0)*(x-x0);
a015e406 1589 if(tmp <= 0.) continue;
1590 tmp = TMath::Sqrt(tmp);
3b57a3f7 1591
1592 // y: R^2 = (x - x0)^2 + (y - y0)^2
1593 // => y = y0 +/- Sqrt(R^2 - (x - x0)^2)
1594 tracklets[ip].SetYref(0, y0 - (y0>0.?1.:-1)*tmp);
1595 // => dy/dx = (x - x0)/Sqrt(R^2 - (x - x0)^2)
1596 tracklets[ip].SetYref(1, (x - x0) / tmp);
1597 tracklets[ip].SetZref(0, z0 + dzdx * (x - xref));
1598 tracklets[ip].SetZref(1, dzdx);
4d6aee34 1599 tracklets[ip].SetC(curvature);
3b57a3f7 1600 tracklets[ip].SetChi2(chi2);
1601 }
1602 }
3b57a3f7 1603 //update track points array
1604 if(np && points){
1605 Float_t xyz[3];
1606 for(int ip=0; ip<np; ip++){
1607 points[ip].GetXYZ(xyz);
4d6aee34 1608 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 1609 xyz[2] = z0 + dzdx * (xyz[0] - xref);
1610 points[ip].SetXYZ(xyz);
1611 }
1612 }
1613
3b57a3f7 1614 return chi2;
1615}
1616
1617
1bf51039 1618//____________________________________________________________________
e17f4785 1619Double_t AliTRDtrackerV1::FitKalman(AliTRDtrackV1 *track, AliTRDseedV1 * const tracklets, Bool_t up, Int_t np, AliTrackPoint *points)
1bf51039 1620{
1621// Kalman filter implementation for the TRD.
1622// It returns the positions of the fit in the array "points"
1623//
1624// Author : A.Bercuci@gsi.de
1625
3cfaffa4 1626 // printf("Start track @ x[%f]\n", track->GetX());
1bf51039 1627
1628 //prepare marker points along the track
1629 Int_t ip = np ? 0 : 1;
1630 while(ip<np){
1631 if((up?-1:1) * (track->GetX() - points[ip].GetX()) > 0.) break;
1632 //printf("AliTRDtrackerV1::FitKalman() : Skip track marker x[%d] = %7.3f. Before track start ( %7.3f ).\n", ip, points[ip].GetX(), track->GetX());
1633 ip++;
1634 }
1635 //if(points) printf("First marker point @ x[%d] = %f\n", ip, points[ip].GetX());
1636
1637
4d6aee34 1638 AliTRDseedV1 tracklet, *ptrTracklet = NULL;
1bf51039 1639
1640 //Loop through the TRD planes
1641 for (Int_t jplane = 0; jplane < kNPlanes; jplane++) {
1642 // GET TRACKLET OR BUILT IT
1643 Int_t iplane = up ? jplane : kNPlanes - 1 - jplane;
1644 if(tracklets){
e17f4785 1645 if(!(ptrTracklet = &tracklets[iplane])) continue;
1bf51039 1646 }else{
1647 if(!(ptrTracklet = track->GetTracklet(iplane))){
4d6aee34 1648 /*AliTRDtrackerV1 *tracker = NULL;
a2fbb6ec 1649 if(!(tracker = dynamic_cast<AliTRDtrackerV1*>( AliTRDrecoParam:Tracker()))) continue;
1bf51039 1650 ptrTracklet = new(&tracklet) AliTRDseedV1(iplane);
1651 if(!tracker->MakeTracklet(ptrTracklet, track)) */
1652 continue;
1653 }
1654 }
1655 if(!ptrTracklet->IsOK()) continue;
1656
1657 Double_t x = ptrTracklet->GetX0();
1658
1659 while(ip < np){
1660 //don't do anything if next marker is after next update point.
1661 if((up?-1:1) * (points[ip].GetX() - x) - fgkMaxStep < 0) break;
1bf51039 1662 if(((up?-1:1) * (points[ip].GetX() - track->GetX()) < 0) && !PropagateToX(*track, points[ip].GetX(), fgkMaxStep)) return -1.;
1663
1664 Double_t xyz[3]; // should also get the covariance
3cfaffa4 1665 track->GetXYZ(xyz);
1666 track->Global2LocalPosition(xyz, track->GetAlpha());
1667 points[ip].SetXYZ(xyz[0], xyz[1], xyz[2]);
1bf51039 1668 ip++;
1669 }
3cfaffa4 1670 // printf("plane[%d] tracklet[%p] x[%f]\n", iplane, ptrTracklet, x);
1bf51039 1671
3cfaffa4 1672 // Propagate closer to the next update point
1bf51039 1673 if(((up?-1:1) * (x - track->GetX()) + fgkMaxStep < 0) && !PropagateToX(*track, x + (up?-1:1)*fgkMaxStep, fgkMaxStep)) return -1.;
1674
1675 if(!AdjustSector(track)) return -1;
1676 if(TMath::Abs(track->GetSnp()) > fgkMaxSnp) return -1;
1677
1678 //load tracklet to the tracker and the track
1679/* Int_t index;
1680 if((index = FindTracklet(ptrTracklet)) < 0){
1681 ptrTracklet = SetTracklet(&tracklet);
1682 index = fTracklets->GetEntriesFast()-1;
1683 }
1684 track->SetTracklet(ptrTracklet, index);*/
1685
1686
1687 // register tracklet to track with tracklet creation !!
1688 // PropagateBack : loaded tracklet to the tracker and update index
1689 // RefitInward : update index
1690 // MakeTrack : loaded tracklet to the tracker and update index
1691 if(!tracklets) track->SetTracklet(ptrTracklet, -1);
1692
1693
1694 //Calculate the mean material budget along the path inside the chamber
1695 Double_t xyz0[3]; track->GetXYZ(xyz0);
1696 Double_t alpha = track->GetAlpha();
1697 Double_t xyz1[3], y, z;
1698 if(!track->GetProlongation(x, y, z)) return -1;
1699 xyz1[0] = x * TMath::Cos(alpha) - y * TMath::Sin(alpha);
1700 xyz1[1] = +x * TMath::Sin(alpha) + y * TMath::Cos(alpha);
1701 xyz1[2] = z;
3cfaffa4 1702 if((xyz0[0] - xyz1[9] < 1e-3) && (xyz0[0] - xyz1[9] < 1e-3)) continue; // check wheter we are at the same global x position
1bf51039 1703 Double_t param[7];
3cfaffa4 1704 if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param) <=0.) break;
1bf51039 1705 Double_t xrho = param[0]*param[4]; // density*length
1706 Double_t xx0 = param[1]; // radiation length
1707
1708 //Propagate the track
1709 track->PropagateTo(x, xx0, xrho);
1710 if (!AdjustSector(track)) break;
1711
1712 //Update track
b72f4eaf 1713 Double_t cov[3]; ptrTracklet->GetCovAt(x, cov);
1714 Double_t p[2] = { ptrTracklet->GetY(), ptrTracklet->GetZ()};
1715 Double_t chi2 = ((AliExternalTrackParam*)track)->GetPredictedChi2(p, cov);
1716 if(chi2<1e+10) track->Update(p, cov, chi2);
1bf51039 1717 if(!up) continue;
1718
1719 //Reset material budget if 2 consecutive gold
1720 if(iplane>0 && track->GetTracklet(iplane-1) && ptrTracklet->GetN() + track->GetTracklet(iplane-1)->GetN() > 20) track->SetBudget(2, 0.);
1721 } // end planes loop
1722
1723 // extrapolation
1724 while(ip < np){
1725 if(((up?-1:1) * (points[ip].GetX() - track->GetX()) < 0) && !PropagateToX(*track, points[ip].GetX(), fgkMaxStep)) return -1.;
1726
1727 Double_t xyz[3]; // should also get the covariance
3cfaffa4 1728 track->GetXYZ(xyz);
1729 track->Global2LocalPosition(xyz, track->GetAlpha());
1730 points[ip].SetXYZ(xyz[0], xyz[1], xyz[2]);
1bf51039 1731 ip++;
1732 }
1733
1734 return track->GetChi2();
1735}
3b57a3f7 1736
eb38ed55 1737//_________________________________________________________________________
bb56afff 1738Float_t AliTRDtrackerV1::CalculateChi2Z(AliTRDseedV1 *tracklets, Double_t offset, Double_t slope, Double_t xref)
eb38ed55 1739{
41702fec 1740 //
1741 // Calculates the chi2-value of the track in z-Direction including tilting pad correction.
1742 // A linear dependence on the x-value serves as a model.
1743 // The parameters are related to the tilted Riemann fit.
1744 // Parameters: - Array of tracklets (AliTRDseedV1) related to the track candidate
1745 // - the offset for the reference x
1746 // - the slope
1747 // - the reference x position
1748 // Output: - The Chi2 value of the track in z-Direction
1749 //
1750 Float_t chi2Z = 0, nLayers = 0;
053767a4 1751 for (Int_t iLayer = 0; iLayer < AliTRDgeometry::kNlayer; iLayer++) {
41702fec 1752 if(!tracklets[iLayer].IsOK()) continue;
1753 Double_t z = offset + slope * (tracklets[iLayer].GetX0() - xref);
e3cf3d02 1754 chi2Z += TMath::Abs(tracklets[iLayer].GetZfit(0) - z);
41702fec 1755 nLayers++;
1756 }
1757 chi2Z /= TMath::Max((nLayers - 3.0),1.0);
1758 return chi2Z;
eb38ed55 1759}
1760
bccda319 1761//_____________________________________________________________________________
1762Int_t AliTRDtrackerV1::PropagateToX(AliTRDtrackV1 &t, Double_t xToGo, Double_t maxStep)
1763{
41702fec 1764 //
1765 // Starting from current X-position of track <t> this function
1766 // extrapolates the track up to radial position <xToGo>.
1767 // Returns 1 if track reaches the plane, and 0 otherwise
1768 //
bccda319 1769
41702fec 1770 const Double_t kEpsilon = 0.00001;
bccda319 1771
41702fec 1772 // Current track X-position
1773 Double_t xpos = t.GetX();
bccda319 1774
41702fec 1775 // Direction: inward or outward
1776 Double_t dir = (xpos < xToGo) ? 1.0 : -1.0;
bccda319 1777
41702fec 1778 while (((xToGo - xpos) * dir) > kEpsilon) {
bccda319 1779
41702fec 1780 Double_t xyz0[3];
1781 Double_t xyz1[3];
1782 Double_t param[7];
1783 Double_t x;
1784 Double_t y;
1785 Double_t z;
bccda319 1786
41702fec 1787 // The next step size
1788 Double_t step = dir * TMath::Min(TMath::Abs(xToGo-xpos),maxStep);
bccda319 1789
41702fec 1790 // Get the global position of the starting point
1791 t.GetXYZ(xyz0);
bccda319 1792
41702fec 1793 // X-position after next step
1794 x = xpos + step;
bccda319 1795
41702fec 1796 // Get local Y and Z at the X-position of the next step
3352b455 1797 if(t.GetProlongation(x,y,z)<0) return 0; // No prolongation possible
bccda319 1798
41702fec 1799 // The global position of the end point of this prolongation step
1800 xyz1[0] = x * TMath::Cos(t.GetAlpha()) - y * TMath::Sin(t.GetAlpha());
1801 xyz1[1] = +x * TMath::Sin(t.GetAlpha()) + y * TMath::Cos(t.GetAlpha());
1802 xyz1[2] = z;
bccda319 1803
41702fec 1804 // Calculate the mean material budget between start and
1805 // end point of this prolongation step
83dea92e 1806 if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param)<=0.) return 0;
bccda319 1807
41702fec 1808 // Propagate the track to the X-position after the next step
9c87a076 1809 if (!t.PropagateTo(x, param[1], param[0]*param[4])) return 0;
bccda319 1810
41702fec 1811 // Rotate the track if necessary
1812 AdjustSector(&t);
bccda319 1813
41702fec 1814 // New track X-position
1815 xpos = t.GetX();
bccda319 1816
41702fec 1817 }
bccda319 1818
41702fec 1819 return 1;
bccda319 1820
1821}
1822
eb38ed55 1823
1824//_____________________________________________________________________________
1825Int_t AliTRDtrackerV1::ReadClusters(TClonesArray* &array, TTree *clusterTree) const
1826{
41702fec 1827 //
1828 // Reads AliTRDclusters from the file.
1829 // The names of the cluster tree and branches
1830 // should match the ones used in AliTRDclusterizer::WriteClusters()
1831 //
1832
1833 Int_t nsize = Int_t(clusterTree->GetTotBytes() / (sizeof(AliTRDcluster)));
1834 TObjArray *clusterArray = new TObjArray(nsize+1000);
1835
1836 TBranch *branch = clusterTree->GetBranch("TRDcluster");
1837 if (!branch) {
1838 AliError("Can't get the branch !");
1839 return 1;
1840 }
1841 branch->SetAddress(&clusterArray);
1842
1843 if(!fClusters){
4d6aee34 1844 Float_t nclusters = fkReconstructor->GetRecoParam()->GetNClusters();
1845 if(fkReconstructor->IsHLT()) nclusters /= AliTRDgeometry::kNsector;
8ae98148 1846 array = new TClonesArray("AliTRDcluster", Int_t(nclusters));
41702fec 1847 array->SetOwner(kTRUE);
1848 }
1849
1850 // Loop through all entries in the tree
1851 Int_t nEntries = (Int_t) clusterTree->GetEntries();
1852 Int_t nbytes = 0;
1853 Int_t ncl = 0;
4d6aee34 1854 AliTRDcluster *c = NULL;
41702fec 1855 for (Int_t iEntry = 0; iEntry < nEntries; iEntry++) {
1856 // Import the tree
1857 nbytes += clusterTree->GetEvent(iEntry);
1858
1859 // Get the number of points in the detector
1860 Int_t nCluster = clusterArray->GetEntriesFast();
1861 for (Int_t iCluster = 0; iCluster < nCluster; iCluster++) {
1862 if(!(c = (AliTRDcluster *) clusterArray->UncheckedAt(iCluster))) continue;
41702fec 1863 new((*fClusters)[ncl++]) AliTRDcluster(*c);
1864 delete (clusterArray->RemoveAt(iCluster));
1865 }
1866
1867 }
1868 delete clusterArray;
1869
1870 return 0;
eb38ed55 1871}
1872
1873//_____________________________________________________________________________
1874Int_t AliTRDtrackerV1::LoadClusters(TTree *cTree)
1875{
41702fec 1876 //
66f6bfd9 1877 // Fills clusters into TRD tracking sectors
41702fec 1878 //
41702fec 1879
4d6aee34 1880 if(!fkReconstructor->IsWritingClusters()){
48f8adf3 1881 fClusters = AliTRDReconstructor::GetClusters();
1882 } else {
66f6bfd9 1883 if (ReadClusters(fClusters, cTree)) {
1884 AliError("Problem with reading the clusters !");
1885 return 1;
1886 }
1887 }
1888 SetClustersOwner();
1889
48f8adf3 1890 if(!fClusters || !fClusters->GetEntriesFast()){
66f6bfd9 1891 AliInfo("No TRD clusters");
41702fec 1892 return 1;
1893 }
66f6bfd9 1894
1895 //Int_t nin =
1896 BuildTrackingContainers();
1897
1898 //Int_t ncl = fClusters->GetEntriesFast();
1899 //AliInfo(Form("Clusters %d [%6.2f %% in the active volume]", ncl, 100.*float(nin)/ncl));
1900
1901 return 0;
1902}
1903
1904//_____________________________________________________________________________
4d6aee34 1905Int_t AliTRDtrackerV1::LoadClusters(TClonesArray * const clusters)
66f6bfd9 1906{
1907 //
1908 // Fills clusters into TRD tracking sectors
1909 // Function for use in the HLT
1910
1911 if(!clusters || !clusters->GetEntriesFast()){
1912 AliInfo("No TRD clusters");
41702fec 1913 return 1;
1914 }
1915
66f6bfd9 1916 fClusters = clusters;
1917 SetClustersOwner();
1918
1919 //Int_t nin =
1920 BuildTrackingContainers();
1921
1922 //Int_t ncl = fClusters->GetEntriesFast();
1923 //AliInfo(Form("Clusters %d [%6.2f %% in the active volume]", ncl, 100.*float(nin)/ncl));
1924
1925 return 0;
1926}
1927
1928
1929//____________________________________________________________________
1930Int_t AliTRDtrackerV1::BuildTrackingContainers()
1931{
1932// Building tracking containers for clusters
1933
1934 Int_t nin =0, icl = fClusters->GetEntriesFast();
41702fec 1935 while (icl--) {
1936 AliTRDcluster *c = (AliTRDcluster *) fClusters->UncheckedAt(icl);
1937 if(c->IsInChamber()) nin++;
1938 Int_t detector = c->GetDetector();
1939 Int_t sector = fGeom->GetSector(detector);
053767a4 1940 Int_t stack = fGeom->GetStack(detector);
1941 Int_t layer = fGeom->GetLayer(detector);
41702fec 1942
053767a4 1943 fTrSec[sector].GetChamber(stack, layer, kTRUE)->InsertCluster(c, icl);
41702fec 1944 }
b0a48c4d 1945
1946 const AliTRDCalDet *cal = AliTRDcalibDB::Instance()->GetT0Det();
053767a4 1947 for(int isector =0; isector<AliTRDgeometry::kNsector; isector++){
41702fec 1948 if(!fTrSec[isector].GetNChambers()) continue;
4d6aee34 1949 fTrSec[isector].Init(fkReconstructor, cal);
41702fec 1950 }
66f6bfd9 1951
1952 return nin;
eb38ed55 1953}
1954
1955
66f6bfd9 1956
0906e73e 1957//____________________________________________________________________
172b6f82 1958void AliTRDtrackerV1::UnloadClusters()
0906e73e 1959{
d4cf71ca 1960//
1961// Clears the arrays of clusters and tracks. Resets sectors and timebins
1962// If option "force" is also set the containers are also deleted. This is useful
1963// in case of HLT
1964
1965 if(fTracks){
1966 fTracks->Delete();
4d6aee34 1967 if(HasRemoveContainers()){delete fTracks; fTracks = NULL;}
d4cf71ca 1968 }
1969 if(fTracklets){
1970 fTracklets->Delete();
4d6aee34 1971 if(HasRemoveContainers()){delete fTracklets; fTracklets = NULL;}
d4cf71ca 1972 }
48f8adf3 1973 if(fClusters){
1974 if(IsClustersOwner()) fClusters->Delete();
1975
1976 // save clusters array in the reconstructor for further use.
4d6aee34 1977 if(!fkReconstructor->IsWritingClusters()){
48f8adf3 1978 AliTRDReconstructor::SetClusters(fClusters);
1979 SetClustersOwner(kFALSE);
4d6aee34 1980 } else AliTRDReconstructor::SetClusters(NULL);
48f8adf3 1981 }
0906e73e 1982
053767a4 1983 for (int i = 0; i < AliTRDgeometry::kNsector; i++) fTrSec[i].Clear();
0906e73e 1984
41702fec 1985 // Increment the Event Number
1986 AliTRDtrackerDebug::SetEventNumber(AliTRDtrackerDebug::GetEventNumber() + 1);
eb38ed55 1987}
0906e73e 1988
fac58f00 1989// //____________________________________________________________________
1990// void AliTRDtrackerV1::UseClusters(const AliKalmanTrack *t, Int_t) const
1991// {
1992// const AliTRDtrackV1 *track = dynamic_cast<const AliTRDtrackV1*>(t);
1993// if(!track) return;
1994//
4d6aee34 1995// AliTRDseedV1 *tracklet = NULL;
fac58f00 1996// for(Int_t ily=AliTRDgeometry::kNlayer; ily--;){
1997// if(!(tracklet = track->GetTracklet(ily))) continue;
4d6aee34 1998// AliTRDcluster *c = NULL;
8d2bec9e 1999// for(Int_t ic=AliTRDseed::kNclusters; ic--;){
fac58f00 2000// if(!(c=tracklet->GetClusters(ic))) continue;
2001// c->Use();
2002// }
2003// }
2004// }
2005//
b1957d3c 2006
eb38ed55 2007//_____________________________________________________________________________
4d6aee34 2008Bool_t AliTRDtrackerV1::AdjustSector(AliTRDtrackV1 *const track)
eb38ed55 2009{
41702fec 2010 //
2011 // Rotates the track when necessary
2012 //
2013
2014 Double_t alpha = AliTRDgeometry::GetAlpha();
2015 Double_t y = track->GetY();
2016 Double_t ymax = track->GetX()*TMath::Tan(0.5*alpha);
3cfaffa4 2017
41702fec 2018 if (y > ymax) {
2019 if (!track->Rotate( alpha)) {
2020 return kFALSE;
2021 }
2022 }
2023 else if (y < -ymax) {
2024 if (!track->Rotate(-alpha)) {
2025 return kFALSE;
2026 }
2027 }
2028
2029 return kTRUE;
0906e73e 2030
2031}
2032
eb38ed55 2033
0906e73e 2034//____________________________________________________________________
4d6aee34 2035AliTRDseedV1* AliTRDtrackerV1::GetTracklet(AliTRDtrackV1 *const track, Int_t p, Int_t &idx)
0906e73e 2036{
41702fec 2037 // Find tracklet for TRD track <track>
2038 // Parameters
2039 // - track
2040 // - sector
2041 // - plane
2042 // - index
2043 // Output
2044 // tracklet
2045 // index
2046 // Detailed description
2047 //
2048 idx = track->GetTrackletIndex(p);
17896e82 2049 AliTRDseedV1 *tracklet = (idx<0) ? NULL : (AliTRDseedV1*)fTracklets->UncheckedAt(idx);
41702fec 2050
2051 return tracklet;
0906e73e 2052}
2053
2054//____________________________________________________________________
4d6aee34 2055AliTRDseedV1* AliTRDtrackerV1::SetTracklet(const AliTRDseedV1 * const tracklet)
0906e73e 2056{
41702fec 2057 // Add this tracklet to the list of tracklets stored in the tracker
2058 //
2059 // Parameters
2060 // - tracklet : pointer to the tracklet to be added to the list
2061 //
2062 // Output
2063 // - the index of the new tracklet in the tracker tracklets list
2064 //
2065 // Detailed description
2066 // Build the tracklets list if it is not yet created (late initialization)
2067 // and adds the new tracklet to the list.
2068 //
2069 if(!fTracklets){
053767a4 2070 fTracklets = new TClonesArray("AliTRDseedV1", AliTRDgeometry::Nsector()*kMaxTracksStack);
41702fec 2071 fTracklets->SetOwner(kTRUE);
2072 }
2073 Int_t nentries = fTracklets->GetEntriesFast();
2074 return new ((*fTracklets)[nentries]) AliTRDseedV1(*tracklet);
972ef65e 2075}
2076
828c6f80 2077//____________________________________________________________________
2078void AliTRDtrackerV1::CookNTimeBins()
2079{
2080 // Initialize number of time bins
2081
2082 if(fgNTimeBins){
2083 // first look if set by hand
2084 AliDebug(2, Form("NTimeBins [%d] (set by user)", fgNTimeBins));
2085 } else if(fkReconstructor && fkReconstructor->HasDigitsParam()) {
2086 // second look into digits param to avoid DB query
2087 fgNTimeBins = fkReconstructor->GetDigitsParam()->GetNTimeBins();
2088 AliDebug(2, Form("NTimeBins [%d] (set from digits param)", fgNTimeBins));
2089 } else { // third query DB
2090 AliTRDcalibDB *trd(NULL);
2091 if((trd = AliTRDcalibDB::Instance())) {
2092 if((fgNTimeBins = trd->GetNumberOfTimeBinsDCS()) <= 0){
2093 AliError("Corrupted DCS Object in OCDB");
2094 fgNTimeBins = 24;
2095 AliDebug(2, Form("NTimeBins [%d] (set to default)", fgNTimeBins));
2096 } else AliDebug(2, Form("NTimeBins [%d] (set from DB)", fgNTimeBins));
2097 } else AliFatal("Could not get DB.");
2098 }
2099 if(fgNTimeBins<=0){
2100 AliFatal("Could not get number of time bins.");
2101 }
2102}
2103
d20df6fc 2104//____________________________________________________________________
4d6aee34 2105AliTRDtrackV1* AliTRDtrackerV1::SetTrack(const AliTRDtrackV1 * const track)
d20df6fc 2106{
2107 // Add this track to the list of tracks stored in the tracker
2108 //
2109 // Parameters
2110 // - track : pointer to the track to be added to the list
2111 //
2112 // Output
2113 // - the pointer added
2114 //
2115 // Detailed description
2116 // Build the tracks list if it is not yet created (late initialization)
2117 // and adds the new track to the list.
2118 //
2119 if(!fTracks){
053767a4 2120 fTracks = new TClonesArray("AliTRDtrackV1", AliTRDgeometry::Nsector()*kMaxTracksStack);
d20df6fc 2121 fTracks->SetOwner(kTRUE);
2122 }
2123 Int_t nentries = fTracks->GetEntriesFast();
2124 return new ((*fTracks)[nentries]) AliTRDtrackV1(*track);
2125}
2126
2127
0906e73e 2128
e4f2f73d 2129//____________________________________________________________________
eb38ed55 2130Int_t AliTRDtrackerV1::Clusters2TracksSM(Int_t sector, AliESDEvent *esd)
e4f2f73d 2131{
41702fec 2132 //
2133 // Steer tracking for one SM.
2134 //
2135 // Parameters :
2136 // sector : Array of (SM) propagation layers containing clusters
2137 // esd : The current ESD event. On output it contains the also
2138 // the ESD (TRD) tracks found in this SM.
2139 //
2140 // Output :
2141 // Number of tracks found in this TRD supermodule.
2142 //
2143 // Detailed description
2144 //
2145 // 1. Unpack AliTRDpropagationLayers objects for each stack.
2146 // 2. Launch stack tracking.
2147 // See AliTRDtrackerV1::Clusters2TracksStack() for details.
2148 // 3. Pack results in the ESD event.
2149 //
2150
2151 // allocate space for esd tracks in this SM
2152 TClonesArray esdTrackList("AliESDtrack", 2*kMaxTracksStack);
2153 esdTrackList.SetOwner();
2154
2155 Int_t nTracks = 0;
2156 Int_t nChambers = 0;
4d6aee34 2157 AliTRDtrackingChamber **stack = NULL, *chamber = NULL;
053767a4 2158 for(int istack = 0; istack<AliTRDgeometry::kNstack; istack++){
41702fec 2159 if(!(stack = fTrSec[sector].GetStack(istack))) continue;
2160 nChambers = 0;
053767a4 2161 for(int ilayer=0; ilayer<AliTRDgeometry::kNlayer; ilayer++){
2162 if(!(chamber = stack[ilayer])) continue;
4d6aee34 2163 if(chamber->GetNClusters() < fgNTimeBins * fkReconstructor->GetRecoParam() ->GetFindableClusters()) continue;
41702fec 2164 nChambers++;
053767a4 2165 //AliInfo(Form("sector %d stack %d layer %d clusters %d", sector, istack, ilayer, chamber->GetNClusters()));
41702fec 2166 }
2167 if(nChambers < 4) continue;
2168 //AliInfo(Form("Doing stack %d", istack));
2169 nTracks += Clusters2TracksStack(stack, &esdTrackList);
2170 }
2171 //AliInfo(Form("Found %d tracks in SM %d [%d]\n", nTracks, sector, esd->GetNumberOfTracks()));
2172
2173 for(int itrack=0; itrack<nTracks; itrack++)
2174 esd->AddTrack((AliESDtrack*)esdTrackList[itrack]);
2175
2176 // Reset Track and Candidate Number
2177 AliTRDtrackerDebug::SetCandidateNumber(0);
2178 AliTRDtrackerDebug::SetTrackNumber(0);
2179 return nTracks;
e4f2f73d 2180}
2181
2182//____________________________________________________________________
4d6aee34 2183Int_t AliTRDtrackerV1::Clusters2TracksStack(AliTRDtrackingChamber **stack, TClonesArray * const esdTrackList)
e4f2f73d 2184{
41702fec 2185 //
2186 // Make tracks in one TRD stack.
2187 //
2188 // Parameters :
2189 // layer : Array of stack propagation layers containing clusters
2190 // esdTrackList : Array of ESD tracks found by the stand alone tracker.
2191 // On exit the tracks found in this stack are appended.
2192 //
2193 // Output :
2194 // Number of tracks found in this stack.
2195 //
2196 // Detailed description
2197 //
2198 // 1. Find the 3 most useful seeding chambers. See BuildSeedingConfigs() for details.
2199 // 2. Steer AliTRDtrackerV1::MakeSeeds() for 3 seeding layer configurations.
2200 // See AliTRDtrackerV1::MakeSeeds() for more details.
2201 // 3. Arrange track candidates in decreasing order of their quality
2202 // 4. Classify tracks in 5 categories according to:
2203 // a) number of layers crossed
2204 // b) track quality
2205 // 5. Sign clusters by tracks in decreasing order of track quality
2206 // 6. Build AliTRDtrack out of seeding tracklets
2207 // 7. Cook MC label
2208 // 8. Build ESD track and register it to the output list
2209 //
2210
b0a48c4d 2211 const AliTRDCalDet *cal = AliTRDcalibDB::Instance()->GetT0Det();
4d6aee34 2212 AliTRDtrackingChamber *chamber = NULL;
2213 AliTRDtrackingChamber **ci = NULL;
41702fec 2214 AliTRDseedV1 sseed[kMaxTracksStack*6]; // to be initialized
2215 Int_t pars[4]; // MakeSeeds parameters
2216
2217 //Double_t alpha = AliTRDgeometry::GetAlpha();
2218 //Double_t shift = .5 * alpha;
2219 Int_t configs[kNConfigs];
2220
fac58f00 2221 // Purge used clusters from the containers
2222 ci = &stack[0];
2223 for(Int_t ic = kNPlanes; ic--; ci++){
2224 if(!(*ci)) continue;
2225 (*ci)->Update();
2226 }
2227
41702fec 2228 // Build initial seeding configurations
2229 Double_t quality = BuildSeedingConfigs(stack, configs);
a2fbb6ec 2230 if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) > 10){
41702fec 2231 AliInfo(Form("Plane config %d %d %d Quality %f"
2232 , configs[0], configs[1], configs[2], quality));
2233 }
d931f2aa 2234
41702fec 2235
2236 // Initialize contors
2237 Int_t ntracks, // number of TRD track candidates
2238 ntracks1, // number of registered TRD tracks/iter
2239 ntracks2 = 0; // number of all registered TRD tracks in stack
2240 fSieveSeeding = 0;
d931f2aa 2241
2242 // Get stack index
fac58f00 2243 Int_t ic = 0; ci = &stack[0];
2244 while(ic<kNPlanes && !(*ci)){ic++; ci++;}
2245 if(!(*ci)) return ntracks2;
2246 Int_t istack = fGeom->GetStack((*ci)->GetDetector());
d931f2aa 2247
41702fec 2248 do{
2249 // Loop over seeding configurations
2250 ntracks = 0; ntracks1 = 0;
2251 for (Int_t iconf = 0; iconf<3; iconf++) {
2252 pars[0] = configs[iconf];
2253 pars[1] = ntracks;
d931f2aa 2254 pars[2] = istack;
41702fec 2255 ntracks = MakeSeeds(stack, &sseed[6*ntracks], pars);
6e39bde4 2256 //AliInfo(Form("Number of Tracks after iteration step %d: %d\n", iconf, ntracks));
41702fec 2257 if(ntracks == kMaxTracksStack) break;
2258 }
980d5a2a 2259 AliDebug(2, Form("Candidate TRD tracks %d in iteration %d.", ntracks, fSieveSeeding));
41702fec 2260
2261 if(!ntracks) break;
2262
2263 // Sort the seeds according to their quality
2264 Int_t sort[kMaxTracksStack];
2265 TMath::Sort(ntracks, fTrackQuality, sort, kTRUE);
2266
2267 // Initialize number of tracks so far and logic switches
2268 Int_t ntracks0 = esdTrackList->GetEntriesFast();
2269 Bool_t signedTrack[kMaxTracksStack];
2270 Bool_t fakeTrack[kMaxTracksStack];
2271 for (Int_t i=0; i<ntracks; i++){
2272 signedTrack[i] = kFALSE;
2273 fakeTrack[i] = kFALSE;
2274 }
2275 //AliInfo("Selecting track candidates ...");
2276
2277 // Sieve clusters in decreasing order of track quality
2278 Double_t trackParams[7];
4d6aee34 2279 // AliTRDseedV1 *lseed = NULL;
41702fec 2280 Int_t jSieve = 0, candidates;
2281 do{
2282 //AliInfo(Form("\t\tITER = %i ", jSieve));
2283
2284 // Check track candidates
2285 candidates = 0;
2286 for (Int_t itrack = 0; itrack < ntracks; itrack++) {
804bb02e 2287 Int_t trackIndex = sort[itrack];
2288 if (signedTrack[trackIndex] || fakeTrack[trackIndex]) continue;
41702fec 2289
2290
804bb02e 2291 // Calculate track parameters from tracklets seeds
804bb02e 2292 Int_t ncl = 0;
2293 Int_t nused = 0;
2294 Int_t nlayers = 0;
2295 Int_t findable = 0;
2296 for (Int_t jLayer = 0; jLayer < kNPlanes; jLayer++) {
2297 Int_t jseed = kNPlanes*trackIndex+jLayer;
2298 if(!sseed[jseed].IsOK()) continue;
f29f13a6 2299 if (TMath::Abs(sseed[jseed].GetYref(0) / sseed[jseed].GetX0()) < 0.158) findable++;
eede7907 2300 // TODO here we get a sig fault which should never happen !
804bb02e 2301 sseed[jseed].UpdateUsed();
2302 ncl += sseed[jseed].GetN2();
2303 nused += sseed[jseed].GetNUsed();
2304 nlayers++;
804bb02e 2305 }
2306
f29f13a6 2307 // Filter duplicated tracks
2308 if (nused > 30){
2309 //printf("Skip %d nused %d\n", trackIndex, nused);
2310 fakeTrack[trackIndex] = kTRUE;
2311 continue;
2312 }
2313 if (Float_t(nused)/ncl >= .25){
2314 //printf("Skip %d nused/ncl >= .25\n", trackIndex);
2315 fakeTrack[trackIndex] = kTRUE;
2316 continue;
2317 }
41702fec 2318
f29f13a6 2319 // Classify tracks
2320 Bool_t skip = kFALSE;
2321 switch(jSieve){
2322 case 0:
2323 if(nlayers < 6) {skip = kTRUE; break;}
2324 if(TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -5.){skip = kTRUE; break;}
2325 break;
2326
2327 case 1:
2328 if(nlayers < findable){skip = kTRUE; break;}
2329 if(TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -4.){skip = kTRUE; break;}
2330 break;
2331
2332 case 2:
2333 if ((nlayers == findable) || (nlayers == 6)) { skip = kTRUE; break;}
2334 if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -6.0){skip = kTRUE; break;}
2335 break;
2336
2337 case 3:
2338 if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -5.){skip = kTRUE; break;}
2339 break;
2340
2341 case 4:
2342 if (nlayers == 3){skip = kTRUE; break;}
2343 //if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) - nused/(nlayers-3.0) < -15.0){skip = kTRUE; break;}
2344 break;
2345 }
2346 if(skip){
2347 candidates++;
2348 //printf("REJECTED : %d [%d] nlayers %d trackQuality = %e nused %d\n", itrack, trackIndex, nlayers, fTrackQuality[trackIndex], nused);
2349 continue;
2350 }
2351 signedTrack[trackIndex] = kTRUE;
2352
2353 // Build track parameters
2354 AliTRDseedV1 *lseed =&sseed[trackIndex*6];
2355 /* Int_t idx = 0;
2356 while(idx<3 && !lseed->IsOK()) {
2357 idx++;
2358 lseed++;
2359 }*/
2360 Double_t x = lseed->GetX0();// - 3.5;
2361 trackParams[0] = x; //NEW AB
2362 trackParams[1] = lseed->GetYref(0); // lseed->GetYat(x);
2363 trackParams[2] = lseed->GetZref(0); // lseed->GetZat(x);
2364 trackParams[3] = TMath::Sin(TMath::ATan(lseed->GetYref(1)));
2365 trackParams[4] = lseed->GetZref(1) / TMath::Sqrt(1. + lseed->GetYref(1) * lseed->GetYref(1));
2366 trackParams[5] = lseed->GetC();
2367 Int_t ich = 0; while(!(chamber = stack[ich])) ich++;
2368 trackParams[6] = fGeom->GetSector(chamber->GetDetector());/* *alpha+shift; // Supermodule*/
2369
a2fbb6ec 2370 if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) > 1 && fkReconstructor->IsDebugStreaming()){
eb2b4f91 2371 //AliInfo(Form("Track %d [%d] nlayers %d trackQuality = %e nused %d, yref = %3.3f", itrack, trackIndex, nlayers, fTrackQuality[trackIndex], nused, trackParams[1]));
f29f13a6 2372
f29f13a6 2373 AliTRDseedV1 *dseed[6];
b82b4de1 2374 for(Int_t iseed = AliTRDgeometry::kNlayer; iseed--;) dseed[iseed] = new AliTRDseedV1(lseed[iseed]);
f29f13a6 2375
2376 //Int_t eventNrInFile = esd->GetEventNumberInFile();
f29f13a6 2377 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2378 Int_t trackNumber = AliTRDtrackerDebug::GetTrackNumber();
2379 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
a2fbb6ec 2380 TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
f29f13a6 2381 cstreamer << "Clusters2TracksStack"
2382 << "EventNumber=" << eventNumber
2383 << "TrackNumber=" << trackNumber
2384 << "CandidateNumber=" << candidateNumber
2385 << "Iter=" << fSieveSeeding
2386 << "Like=" << fTrackQuality[trackIndex]
2387 << "S0.=" << dseed[0]
2388 << "S1.=" << dseed[1]
2389 << "S2.=" << dseed[2]
2390 << "S3.=" << dseed[3]
2391 << "S4.=" << dseed[4]
2392 << "S5.=" << dseed[5]
2393 << "p0=" << trackParams[0]
2394 << "p1=" << trackParams[1]
2395 << "p2=" << trackParams[2]
2396 << "p3=" << trackParams[3]
2397 << "p4=" << trackParams[4]
2398 << "p5=" << trackParams[5]
2399 << "p6=" << trackParams[6]
f29f13a6 2400 << "Ncl=" << ncl
2401 << "NLayers=" << nlayers
2402 << "Findable=" << findable
2403 << "NUsed=" << nused
2404 << "\n";
2405 }
d877f55f 2406
f29f13a6 2407 AliTRDtrackV1 *track = MakeTrack(&sseed[trackIndex*kNPlanes], trackParams);
2408 if(!track){
980d5a2a 2409 AliDebug(1, "Track building failed.");
f29f13a6 2410 continue;
d877f55f 2411 }
41702fec 2412
f29f13a6 2413 //AliInfo("End of MakeTrack()");
2414 AliESDtrack *esdTrack = new ((*esdTrackList)[ntracks0++]) AliESDtrack();
2415 esdTrack->UpdateTrackParams(track, AliESDtrack::kTRDout);
2416 esdTrack->SetLabel(track->GetLabel());
2417 track->UpdateESDtrack(esdTrack);
2418 // write ESD-friends if neccessary
a2fbb6ec 2419 if (fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) > 0){
f29f13a6 2420 AliTRDtrackV1 *calibTrack = new AliTRDtrackV1(*track);
2421 calibTrack->SetOwner();
2422 esdTrack->AddCalibObject(calibTrack);
2423 }
2424 ntracks1++;
2425 AliTRDtrackerDebug::SetTrackNumber(AliTRDtrackerDebug::GetTrackNumber() + 1);
41702fec 2426 }
2427
2428 jSieve++;
2429 } while(jSieve<5 && candidates); // end track candidates sieve
2430 if(!ntracks1) break;
2431
2432 // increment counters
2433 ntracks2 += ntracks1;
4302c900 2434
4d6aee34 2435 if(fkReconstructor->IsHLT()) break;
41702fec 2436 fSieveSeeding++;
2437
2438 // Rebuild plane configurations and indices taking only unused clusters into account
2439 quality = BuildSeedingConfigs(stack, configs);
4d6aee34 2440 if(quality < 1.E-7) break; //fkReconstructor->GetRecoParam() ->GetPlaneQualityThreshold()) break;
41702fec 2441
2442 for(Int_t ip = 0; ip < kNPlanes; ip++){
2443 if(!(chamber = stack[ip])) continue;
b0a48c4d 2444 chamber->Build(fGeom, cal);//Indices(fSieveSeeding);
41702fec 2445 }
2446
a2fbb6ec 2447 if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) > 10){
41702fec 2448 AliInfo(Form("Sieve level %d Plane config %d %d %d Quality %f", fSieveSeeding, configs[0], configs[1], configs[2], quality));
2449 }
2450 } while(fSieveSeeding<10); // end stack clusters sieve
2451
2452
2453
2454 //AliInfo(Form("Registered TRD tracks %d in stack %d.", ntracks2, pars[1]));
2455
2456 return ntracks2;
e4f2f73d 2457}
2458
2459//___________________________________________________________________
eb38ed55 2460Double_t AliTRDtrackerV1::BuildSeedingConfigs(AliTRDtrackingChamber **stack, Int_t *configs)
e4f2f73d 2461{
41702fec 2462 //
2463 // Assign probabilities to chambers according to their
2464 // capability of producing seeds.
2465 //
2466 // Parameters :
2467 //
2468 // layers : Array of stack propagation layers for all 6 chambers in one stack
2469 // configs : On exit array of configuration indexes (see GetSeedingConfig()
2470 // for details) in the decreasing order of their seeding probabilities.
2471 //
2472 // Output :
2473 //
2474 // Return top configuration quality
2475 //
2476 // Detailed description:
2477 //
2478 // To each chamber seeding configuration (see GetSeedingConfig() for
2479 // the list of all configurations) one defines 2 quality factors:
2480 // - an apriori topological quality (see GetSeedingConfig() for details) and
2481 // - a data quality based on the uniformity of the distribution of
2482 // clusters over the x range (time bins population). See CookChamberQA() for details.
2483 // The overall chamber quality is given by the product of this 2 contributions.
2484 //
2485
eb2b4f91 2486 Double_t chamberQ[kNPlanes];memset(chamberQ, 0, kNPlanes*sizeof(Double_t));
4d6aee34 2487 AliTRDtrackingChamber *chamber = NULL;
41702fec 2488 for(int iplane=0; iplane<kNPlanes; iplane++){
2489 if(!(chamber = stack[iplane])) continue;
2490 chamberQ[iplane] = (chamber = stack[iplane]) ? chamber->GetQuality() : 0.;
2491 }
2492
eb2b4f91 2493 Double_t tconfig[kNConfigs];memset(tconfig, 0, kNConfigs*sizeof(Double_t));
2494 Int_t planes[] = {0, 0, 0, 0};
41702fec 2495 for(int iconf=0; iconf<kNConfigs; iconf++){
2496 GetSeedingConfig(iconf, planes);
2497 tconfig[iconf] = fgTopologicQA[iconf];
2498 for(int iplane=0; iplane<4; iplane++) tconfig[iconf] *= chamberQ[planes[iplane]];
2499 }
2500
2501 TMath::Sort((Int_t)kNConfigs, tconfig, configs, kTRUE);
2502 // AliInfo(Form("q[%d] = %f", configs[0], tconfig[configs[0]]));
2503 // AliInfo(Form("q[%d] = %f", configs[1], tconfig[configs[1]]));
2504 // AliInfo(Form("q[%d] = %f", configs[2], tconfig[configs[2]]));
2505
2506 return tconfig[configs[0]];
e4f2f73d 2507}
2508
2509//____________________________________________________________________
e17f4785 2510Int_t AliTRDtrackerV1::MakeSeeds(AliTRDtrackingChamber **stack, AliTRDseedV1 * const sseed, const Int_t * const ipar)
e4f2f73d 2511{
afa21247 2512//
2a3191bb 2513// Seed tracklets and build candidate TRD tracks. The procedure is used during barrel tracking to account for tracks which are
2514// either missed by TPC prolongation or conversions inside the TRD volume.
2515// For stand alone tracking the procedure is used to estimate all tracks measured by TRD.
afa21247 2516//
2517// Parameters :
2518// layers : Array of stack propagation layers containing clusters
2519// sseed : Array of empty tracklet seeds. On exit they are filled.
2520// ipar : Control parameters:
2521// ipar[0] -> seeding chambers configuration
2522// ipar[1] -> stack index
2523// ipar[2] -> number of track candidates found so far
2524//
2525// Output :
2526// Number of tracks candidates found.
2527//
2528// The following steps are performed:
2529// 1. Build seeding layers by collapsing all time bins from each of the four seeding chambers along the
2530// radial coordinate. See AliTRDtrackingChamber::GetSeedingLayer() for details. The chambers selection for seeding
2531// is described in AliTRDtrackerV1::Clusters2TracksStack().
2532// 2. Using the seeding clusters from the seeding layer (step 1) build combinatorics using the following algorithm:
2533// - for each seeding cluster in the lower seeding layer find
2534// - all seeding clusters in the upper seeding layer inside a road defined by a given phi angle. The angle
2535// is calculated on the minimum pt of tracks from vertex accesible to the stand alone tracker.
2536// - for each pair of two extreme seeding clusters select middle upper cluster using roads defined externally by the
2537// reco params
2538// - select last seeding cluster as the nearest to the linear approximation of the track described by the first three
2539// seeding clusters.
2540// The implementation of road calculation and cluster selection can be found in the functions AliTRDchamberTimeBin::BuildCond()
2541// and AliTRDchamberTimeBin::GetClusters().
2542// 3. Helix fit of the seeding clusters set. (see AliTRDtrackerFitter::FitRieman(AliTRDcluster**)). No tilt correction is
2543// performed at this level
2544// 4. Initialize seeding tracklets in the seeding chambers.
2545// 5. *Filter 0* Chi2 cut on the Y and Z directions. The threshold is set externally by the reco params.
2546// 6. Attach (true) clusters to seeding tracklets (see AliTRDseedV1::AttachClusters()) and fit tracklet (see
2547// AliTRDseedV1::Fit()). The number of used clusters used by current seeds should not exceed ... (25).
2548// 7. *Filter 1* Check if all 4 seeding tracklets are correctly constructed.
2549// 8. Helix fit of the clusters from the seeding tracklets with tilt correction. Refit tracklets using the new
2550// approximation of the track.
2551// 9. *Filter 2* Calculate likelihood of the track. (See AliTRDtrackerV1::CookLikelihood()). The following quantities are
2552// checked against the Riemann fit:
2553// - position resolution in y
2554// - angular resolution in the bending plane
2555// - likelihood of the number of clusters attached to the tracklet
2556// 10. Extrapolation of the helix fit to the other 2 chambers *non seeding* chambers:
2557// - Initialization of extrapolation tracklets with the fit parameters
2558// - Attach clusters to extrapolated tracklets
2559// - Helix fit of tracklets
2560// 11. Improve seeding tracklets quality by reassigning clusters based on the last parameters of the track
2561// See AliTRDtrackerV1::ImproveSeedQuality() for details.
2562// 12. Helix fit of all 6 seeding tracklets and chi2 calculation
2563// 13. Hyperplane fit and track quality calculation. See AliTRDtrackerFitter::FitHyperplane() for details.
2564// 14. Cooking labels for tracklets. Should be done only for MC
2565// 15. Register seeds.
2566//
2567// Authors:
2568// Marian Ivanov <M.Ivanov@gsi.de>
2569// Alexandru Bercuci <A.Bercuci@gsi.de>
2570// Markus Fasel <M.Fasel@gsi.de>
41702fec 2571
4d6aee34 2572 AliTRDtrackingChamber *chamber = NULL;
2573 AliTRDcluster *c[kNSeedPlanes] = {NULL, NULL, NULL, NULL}; // initilize seeding clusters
e17f4785 2574 AliTRDseedV1 *cseed = &sseed[0]; // initialize tracklets for first track
41702fec 2575 Int_t ncl, mcl; // working variable for looping over clusters
2576 Int_t index[AliTRDchamberTimeBin::kMaxClustersLayer], jndex[AliTRDchamberTimeBin::kMaxClustersLayer];
2577 // chi2 storage
2578 // chi2[0] = tracklet chi2 on the Z direction
2579 // chi2[1] = tracklet chi2 on the R direction
2580 Double_t chi2[4];
2581
afa21247 2582 // this should be data member of AliTRDtrack TODO
41702fec 2583 Double_t seedQuality[kMaxTracksStack];
2584
2585 // unpack control parameters
2586 Int_t config = ipar[0];
2587 Int_t ntracks = ipar[1];
d931f2aa 2588 Int_t istack = ipar[2];
41702fec 2589 Int_t planes[kNSeedPlanes]; GetSeedingConfig(config, planes);
afa21247 2590 Int_t planesExt[kNPlanes-kNSeedPlanes]; GetExtrapolationConfig(config, planesExt);
be24510a 2591
2592
41702fec 2593 // Init chambers geometry
41702fec 2594 Double_t hL[kNPlanes]; // Tilting angle
2595 Float_t padlength[kNPlanes]; // pad lenghts
dd8059a8 2596 Float_t padwidth[kNPlanes]; // pad widths
4d6aee34 2597 AliTRDpadPlane *pp = NULL;
41702fec 2598 for(int iplane=0; iplane<kNPlanes; iplane++){
2599 pp = fGeom->GetPadPlane(iplane, istack);
bb79ccd5 2600 hL[iplane] = TMath::Tan(TMath::DegToRad()*pp->GetTiltingAngle());
41702fec 2601 padlength[iplane] = pp->GetLengthIPad();
dd8059a8 2602 padwidth[iplane] = pp->GetWidthIPad();
41702fec 2603 }
2604
eb2b4f91 2605 // Init anode wire position for chambers
e165b64b 2606 Double_t x0[kNPlanes], // anode wire position
eb2b4f91 2607 driftLength = .5*AliTRDgeometry::AmThick() - AliTRDgeometry::DrThick(); // drift length
4d6aee34 2608 TGeoHMatrix *matrix = NULL;
eb2b4f91 2609 Double_t loc[] = {AliTRDgeometry::AnodePos(), 0., 0.};
2610 Double_t glb[] = {0., 0., 0.};
2611 AliTRDtrackingChamber **cIter = &stack[0];
a3743898 2612 for(int iLayer=0; iLayer<kNPlanes; iLayer++,cIter++){
eb2b4f91 2613 if(!(*cIter)) continue;
e165b64b 2614 if(!(matrix = fGeom->GetClusterMatrix((*cIter)->GetDetector()))){
2615 continue;
2616 x0[iLayer] = fgkX0[iLayer];
2617 }
eb2b4f91 2618 matrix->LocalToMaster(loc, glb);
2619 x0[iLayer] = glb[0];
2620 }
2621
980d5a2a 2622 AliDebug(2, Form("Making seeds Stack[%d] Config[%d] Tracks[%d]...", istack, config, ntracks));
41702fec 2623
d931f2aa 2624 // Build seeding layers
d611c74f 2625 ResetSeedTB();
41702fec 2626 Int_t nlayers = 0;
41702fec 2627 for(int isl=0; isl<kNSeedPlanes; isl++){
2628 if(!(chamber = stack[planes[isl]])) continue;
4d6aee34 2629 if(!chamber->GetSeedingLayer(fSeedTB[isl], fGeom, fkReconstructor)) continue;
41702fec 2630 nlayers++;
41702fec 2631 }
eb2b4f91 2632 if(nlayers < kNSeedPlanes) return ntracks;
41702fec 2633
2634
2635 // Start finding seeds
2636 Double_t cond0[4], cond1[4], cond2[4];
2637 Int_t icl = 0;
d611c74f 2638 while((c[3] = (*fSeedTB[3])[icl++])){
41702fec 2639 if(!c[3]) continue;
d611c74f 2640 fSeedTB[0]->BuildCond(c[3], cond0, 0);
2641 fSeedTB[0]->GetClusters(cond0, index, ncl);
41702fec 2642 //printf("Found c[3] candidates 0 %d\n", ncl);
2643 Int_t jcl = 0;
2644 while(jcl<ncl) {
d611c74f 2645 c[0] = (*fSeedTB[0])[index[jcl++]];
41702fec 2646 if(!c[0]) continue;
2647 Double_t dx = c[3]->GetX() - c[0]->GetX();
afa21247 2648 Double_t dzdx = (c[3]->GetZ() - c[0]->GetZ())/dx;
2649 Double_t dydx = (c[3]->GetY() - c[0]->GetY())/dx;
2650 fSeedTB[1]->BuildCond(c[0], cond1, 1, dzdx, dydx);
d611c74f 2651 fSeedTB[1]->GetClusters(cond1, jndex, mcl);
41702fec 2652 //printf("Found c[0] candidates 1 %d\n", mcl);
2653
2654 Int_t kcl = 0;
2655 while(kcl<mcl) {
d611c74f 2656 c[1] = (*fSeedTB[1])[jndex[kcl++]];
2657 if(!c[1]) continue;
afa21247 2658 fSeedTB[2]->BuildCond(c[1], cond2, 2, dzdx, dydx);
d611c74f 2659 c[2] = fSeedTB[2]->GetNearestCluster(cond2);
2660 //printf("Found c[1] candidate 2 %p\n", c[2]);
2661 if(!c[2]) continue;
980d5a2a 2662
2663 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].",
2664 c[0]->GetX(), c[0]->GetY(), c[0]->GetZ(),
2665 c[1]->GetX(), c[1]->GetY(), c[1]->GetZ(),
2666 c[2]->GetX(), c[2]->GetY(), c[2]->GetZ(),
2667 c[3]->GetX(), c[3]->GetY(), c[3]->GetZ()));
d611c74f 2668
804bb02e 2669 for (Int_t il = 0; il < kNPlanes; il++) cseed[il].Reset();
41702fec 2670
d611c74f 2671 FitRieman(c, chi2);
2672
d931f2aa 2673 AliTRDseedV1 *tseed = &cseed[0];
bb2db46c 2674 cIter = &stack[0];
2675 for(int iLayer=0; iLayer<kNPlanes; iLayer++, tseed++, cIter++){
2676 Int_t det = (*cIter) ? (*cIter)->GetDetector() : -1;
eb2b4f91 2677 tseed->SetDetector(det);
43d6ad34 2678 tseed->SetTilt(hL[iLayer]);
2679 tseed->SetPadLength(padlength[iLayer]);
dd8059a8 2680 tseed->SetPadWidth(padwidth[iLayer]);
4d6aee34 2681 tseed->SetReconstructor(fkReconstructor);
eb2b4f91 2682 tseed->SetX0(det<0 ? fR[iLayer]+driftLength : x0[iLayer]);
d611c74f 2683 tseed->Init(GetRiemanFitter());
f29f13a6 2684 tseed->SetStandAlone(kTRUE);
d611c74f 2685 }
2686
2687 Bool_t isFake = kFALSE;
a2fbb6ec 2688 if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) >= 2 && fkReconstructor->IsDebugStreaming()){
d611c74f 2689 if (c[0]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
2690 if (c[1]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
2691 if (c[2]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
2692
2693 Double_t xpos[4];
2694 for(Int_t l = 0; l < kNSeedPlanes; l++) xpos[l] = fSeedTB[l]->GetX();
2695 Float_t yref[4];
2696 for(int il=0; il<4; il++) yref[il] = cseed[planes[il]].GetYref(0);
2697 Int_t ll = c[3]->GetLabel(0);
2698 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2699 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2700 AliRieman *rim = GetRiemanFitter();
a2fbb6ec 2701 TTreeSRedirector &cs0 = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
d611c74f 2702 cs0 << "MakeSeeds0"
2703 <<"EventNumber=" << eventNumber
2704 <<"CandidateNumber=" << candidateNumber
2705 <<"isFake=" << isFake
2706 <<"config=" << config
2707 <<"label=" << ll
2708 <<"chi2z=" << chi2[0]
2709 <<"chi2y=" << chi2[1]
2710 <<"Y2exp=" << cond2[0]
2711 <<"Z2exp=" << cond2[1]
2712 <<"X0=" << xpos[0] //layer[sLayer]->GetX()
2713 <<"X1=" << xpos[1] //layer[sLayer + 1]->GetX()
2714 <<"X2=" << xpos[2] //layer[sLayer + 2]->GetX()
2715 <<"X3=" << xpos[3] //layer[sLayer + 3]->GetX()
2716 <<"yref0=" << yref[0]
2717 <<"yref1=" << yref[1]
2718 <<"yref2=" << yref[2]
2719 <<"yref3=" << yref[3]
2720 <<"c0.=" << c[0]
2721 <<"c1.=" << c[1]
2722 <<"c2.=" << c[2]
2723 <<"c3.=" << c[3]
2724 <<"Seed0.=" << &cseed[planes[0]]
2725 <<"Seed1.=" << &cseed[planes[1]]
2726 <<"Seed2.=" << &cseed[planes[2]]
2727 <<"Seed3.=" << &cseed[planes[3]]
2728 <<"RiemanFitter.=" << rim
2729 <<"\n";
2730 }
4d6aee34 2731 if(chi2[0] > fkReconstructor->GetRecoParam() ->GetChi2Z()/*7./(3. - sLayer)*//*iter*/){
980d5a2a 2732 AliDebug(3, Form("Filter on chi2Z [%f].", chi2[0]));
d611c74f 2733 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2734 continue;
2735 }
4d6aee34 2736 if(chi2[1] > fkReconstructor->GetRecoParam() ->GetChi2Y()/*1./(3. - sLayer)*//*iter*/){
980d5a2a 2737 AliDebug(3, Form("Filter on chi2Y [%f].", chi2[1]));
d611c74f 2738 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2739 continue;
2740 }
2741 //AliInfo("Passed chi2 filter.");
2742
2743 // try attaching clusters to tracklets
6e39bde4 2744 Int_t mlayers = 0;
980d5a2a 2745 AliTRDcluster *cl = NULL;
be24510a 2746 for(int iLayer=0; iLayer<kNSeedPlanes; iLayer++){
d611c74f 2747 Int_t jLayer = planes[iLayer];
980d5a2a 2748 Int_t nNotInChamber = 0;
f29f13a6 2749 if(!cseed[jLayer].AttachClusters(stack[jLayer], kTRUE)) continue;
980d5a2a 2750 if(/*fkReconstructor->IsHLT()*/kFALSE){
2751 cseed[jLayer].UpdateUsed();
2752 if(!cseed[jLayer].IsOK()) continue;
2753 }else{
2754 cseed[jLayer].Fit();
2755 cseed[jLayer].UpdateUsed();
2756 cseed[jLayer].ResetClusterIter();
2757 while((cl = cseed[jLayer].NextCluster())){
2758 if(!cl->IsInChamber()) nNotInChamber++;
2759 }
2760 //printf("clusters[%d], used[%d], not in chamber[%d]\n", cseed[jLayer].GetN(), cseed[jLayer].GetNUsed(), nNotInChamber);
2761 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
2762 }
d611c74f 2763 mlayers++;
2764 }
be24510a 2765
2766 if(mlayers < kNSeedPlanes){
980d5a2a 2767 AliDebug(2, Form("Found only %d tracklets out of %d. Skip.", mlayers, kNSeedPlanes));
be24510a 2768 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2769 continue;
2770 }
2771
2772 // temporary exit door for the HLT
4d6aee34 2773 if(fkReconstructor->IsHLT()){
be24510a 2774 // attach clusters to extrapolation chambers
2775 for(int iLayer=0; iLayer<kNPlanes-kNSeedPlanes; iLayer++){
2776 Int_t jLayer = planesExt[iLayer];
2777 if(!(chamber = stack[jLayer])) continue;
980d5a2a 2778 if(!cseed[jLayer].AttachClusters(chamber, kTRUE)) continue;
5f1ae1e7 2779 cseed[jLayer].Fit();
be24510a 2780 }
4302c900 2781 fTrackQuality[ntracks] = 1.; // dummy value
2782 ntracks++;
218ba867 2783 if(ntracks == kMaxTracksStack) return ntracks;
4302c900 2784 cseed += 6;
2785 continue;
2786 }
2787
be24510a 2788
f29f13a6 2789 // Update Seeds and calculate Likelihood
d611c74f 2790 // fit tracklets and cook likelihood
f29f13a6 2791 FitTiltedRieman(&cseed[0], kTRUE);
2792 for(int iLayer=0; iLayer<kNSeedPlanes; iLayer++){
2793 Int_t jLayer = planes[iLayer];
2794 cseed[jLayer].Fit(kTRUE);
2795 }
91834b8d 2796 Double_t like = CookLikelihood(&cseed[0], planes); // to be checked
d611c74f 2797
4d6aee34 2798 if (TMath::Log(1.E-9 + like) < fkReconstructor->GetRecoParam() ->GetTrackLikelihood()){
980d5a2a 2799 AliDebug(3, Form("Filter on likelihood %f[%e].", TMath::Log(1.E-9 + like), like));
d611c74f 2800 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2801 continue;
2802 }
2803 //AliInfo(Form("Passed likelihood %f[%e].", TMath::Log(1.E-9 + like), like));
2804
2805 // book preliminary results
2806 seedQuality[ntracks] = like;
2807 fSeedLayer[ntracks] = config;/*sLayer;*/
2808
2809 // attach clusters to the extrapolation seeds
980d5a2a 2810 Int_t elayers(0);
be24510a 2811 for(int iLayer=0; iLayer<kNPlanes-kNSeedPlanes; iLayer++){
2812 Int_t jLayer = planesExt[iLayer];
d611c74f 2813 if(!(chamber = stack[jLayer])) continue;
d611c74f 2814
2815 // fit extrapolated seed
2816 if ((jLayer == 0) && !(cseed[1].IsOK())) continue;
2817 if ((jLayer == 5) && !(cseed[4].IsOK())) continue;
2818 AliTRDseedV1 pseed = cseed[jLayer];
f29f13a6 2819 if(!pseed.AttachClusters(chamber, kTRUE)) continue;
2820 pseed.Fit(kTRUE);
d611c74f 2821 cseed[jLayer] = pseed;
d611c74f 2822 FitTiltedRieman(cseed, kTRUE);
f29f13a6 2823 cseed[jLayer].Fit(kTRUE);
980d5a2a 2824 elayers++;
d611c74f 2825 }
2826
2827 // AliInfo("Extrapolation done.");
2828 // Debug Stream containing all the 6 tracklets
a2fbb6ec 2829 if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) >= 2 && fkReconstructor->IsDebugStreaming()){
2830 TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
d611c74f 2831 TLinearFitter *tiltedRieman = GetTiltedRiemanFitter();
2832 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2833 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2834 cstreamer << "MakeSeeds1"
2835 << "EventNumber=" << eventNumber
2836 << "CandidateNumber=" << candidateNumber
2837 << "S0.=" << &cseed[0]
2838 << "S1.=" << &cseed[1]
2839 << "S2.=" << &cseed[2]
2840 << "S3.=" << &cseed[3]
2841 << "S4.=" << &cseed[4]
2842 << "S5.=" << &cseed[5]
2843 << "FitterT.=" << tiltedRieman
2844 << "\n";
2845 }
2846
980d5a2a 2847 if(fkReconstructor->GetRecoParam()->HasImproveTracklets()){
2848 AliTRDseedV1 bseed[AliTRDgeometry::kNlayer];
2849 for(Int_t jLayer=AliTRDgeometry::kNlayer; jLayer--;) bseed[jLayer] = cseed[jLayer];
2850
2851 if(ImproveSeedQuality(stack, cseed) < mlayers+elayers){
2852 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2853 AliDebug(3, "Filter on improve seeds.");
2854 } else {
2855 // store results
2856 for(Int_t jLayer=AliTRDgeometry::kNlayer; jLayer--;) cseed[jLayer] = bseed[jLayer];
2857 }
d611c74f 2858 }
2859 //AliInfo("Improve seed quality done.");
2860
2861 // fit full track and cook likelihoods
2862 // Double_t curv = FitRieman(&cseed[0], chi2);
2863 // Double_t chi2ZF = chi2[0] / TMath::Max((mlayers - 3.), 1.);
2864 // Double_t chi2RF = chi2[1] / TMath::Max((mlayers - 3.), 1.);
2865
2866 // do the final track fitting (Once with vertex constraint and once without vertex constraint)
2867 Double_t chi2Vals[3];
6e39bde4 2868 chi2Vals[0] = FitTiltedRieman(&cseed[0], kTRUE);
a2fbb6ec 2869 if(fkReconstructor->GetRecoParam()->IsVertexConstrained())
d611c74f 2870 chi2Vals[1] = FitTiltedRiemanConstraint(&cseed[0], GetZ()); // Do Vertex Constrained fit if desired
2871 else
2872 chi2Vals[1] = 1.;
2873 chi2Vals[2] = GetChi2Z(&cseed[0]) / TMath::Max((mlayers - 3.), 1.);
2874 // Chi2 definitions in testing stage
2875 //chi2Vals[2] = GetChi2ZTest(&cseed[0]);
2876 fTrackQuality[ntracks] = CalculateTrackLikelihood(&cseed[0], &chi2Vals[0]);
2877 //AliInfo("Hyperplane fit done\n");
fac58f00 2878
a2fbb6ec 2879 if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) >= 2 && fkReconstructor->IsDebugStreaming()){
2880 TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
d611c74f 2881 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2882 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2883 TLinearFitter *fitterTC = GetTiltedRiemanFitterConstraint();
2884 TLinearFitter *fitterT = GetTiltedRiemanFitter();
91834b8d 2885 Int_t ncls = 0;
2886 for(Int_t iseed = 0; iseed < kNPlanes; iseed++){
2887 ncls += cseed[iseed].IsOK() ? cseed[iseed].GetN2() : 0;
2888 }
d611c74f 2889 cstreamer << "MakeSeeds2"
2890 << "EventNumber=" << eventNumber
2891 << "CandidateNumber=" << candidateNumber
2892 << "Chi2TR=" << chi2Vals[0]
2893 << "Chi2TC=" << chi2Vals[1]
2894 << "Nlayers=" << mlayers
91834b8d 2895 << "NClusters=" << ncls
d611c74f 2896 << "Like=" << like
2897 << "S0.=" << &cseed[0]
2898 << "S1.=" << &cseed[1]
2899 << "S2.=" << &cseed[2]
2900 << "S3.=" << &cseed[3]
2901 << "S4.=" << &cseed[4]
2902 << "S5.=" << &cseed[5]
d611c74f 2903 << "FitterT.=" << fitterT
2904 << "FitterTC.=" << fitterTC
2905 << "\n";
2906 }
2907
2908 ntracks++;
2909 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2910 if(ntracks == kMaxTracksStack){
2911 AliWarning(Form("Number of seeds reached maximum allowed (%d) in stack.", kMaxTracksStack));
2912 return ntracks;
2913 }
2914 cseed += 6;
41702fec 2915 }
2916 }
2917 }
41702fec 2918
2919 return ntracks;
e4f2f73d 2920}
2921
2922//_____________________________________________________________________________
e17f4785 2923AliTRDtrackV1* AliTRDtrackerV1::MakeTrack(AliTRDseedV1 * const seeds, Double_t *params)
e4f2f73d 2924{
afa21247 2925//
2926// Build a TRD track out of tracklet candidates
2927//
2928// Parameters :
2929// seeds : array of tracklets
2930// params : array of track parameters as they are estimated by stand alone tracker. 7 elements.
2931// [0] - radial position of the track at reference point
2932// [1] - y position of the fit at [0]
2933// [2] - z position of the fit at [0]
2934// [3] - snp of the first tracklet
2935// [4] - tgl of the first tracklet
2936// [5] - curvature of the Riemann fit - 1/pt
2937// [6] - sector rotation angle
2938//
2939// Output :
2940// The TRD track.
2941//
2942// Initialize the TRD track based on the parameters of the fit and a parametric covariance matrix
2943// (diagonal with constant variance terms TODO - correct parameterization)
2944//
2945// In case of HLT just register the tracklets in the tracker and return values of the Riemann fit. For the
2946// offline case perform a full Kalman filter on the already found tracklets (see AliTRDtrackerV1::FollowBackProlongation()
2947// for details). Do also MC label calculation and PID if propagation successfully.
41702fec 2948
afa21247 2949
41702fec 2950 Double_t alpha = AliTRDgeometry::GetAlpha();
2951 Double_t shift = AliTRDgeometry::GetAlpha()/2.0;
2952 Double_t c[15];
2953
afa21247 2954 c[ 0] = 0.2; // s^2_y
2955 c[ 1] = 0.0; c[ 2] = 2.0; // s^2_z
2956 c[ 3] = 0.0; c[ 4] = 0.0; c[ 5] = 0.02; // s^2_snp
2957 c[ 6] = 0.0; c[ 7] = 0.0; c[ 8] = 0.0; c[ 9] = 0.1; // s^2_tgl
2958 c[10] = 0.0; c[11] = 0.0; c[12] = 0.0; c[13] = 0.0; c[14] = params[5]*params[5]*0.01; // s^2_1/pt
41702fec 2959
d20df6fc 2960 AliTRDtrackV1 track(seeds, &params[1], c, params[0], params[6]*alpha+shift);
2961 track.PropagateTo(params[0]-5.0);
4d6aee34 2962 AliTRDseedV1 *ptrTracklet = NULL;
9887cc9f 2963
2964 // skip Kalman filter for HLT
5f1ae1e7 2965 if(/*fkReconstructor->IsHLT()*/kFALSE){
9887cc9f 2966 for (Int_t jLayer = 0; jLayer < AliTRDgeometry::kNlayer; jLayer++) {
2967 track.UnsetTracklet(jLayer);
e17f4785 2968 ptrTracklet = &seeds[jLayer];
9887cc9f 2969 if(!ptrTracklet->IsOK()) continue;
5f1ae1e7 2970 if(TMath::Abs(ptrTracklet->GetYref(1) - ptrTracklet->GetYfit(1)) >= .2) continue; // check this condition with Marian
9887cc9f 2971 ptrTracklet = SetTracklet(ptrTracklet);
f29f13a6 2972 ptrTracklet->UseClusters();
91834b8d 2973 track.SetTracklet(ptrTracklet, fTracklets->GetEntriesFast()-1);
2974 }
d78d7df0 2975 AliTRDtrackV1 *ptrTrack = SetTrack(&track);
799e38d7 2976 ptrTrack->CookPID();
5f1ae1e7 2977 ptrTrack->CookLabel(.9);
4d6aee34 2978 ptrTrack->SetReconstructor(fkReconstructor);
d78d7df0 2979 return ptrTrack;
91834b8d 2980 }
393fda1c 2981
17e0e535 2982 if(TMath::Abs(track.GetY())>1000)
2983 return NULL;
2984
d20df6fc 2985 track.ResetCovariance(1);
e79f8eb0 2986 Int_t nc = TMath::Abs(FollowBackProlongation(track));
a2fbb6ec 2987 if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) > 5 && fkReconstructor->IsDebugStreaming()){
393fda1c 2988 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2989 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2990 Double_t p[5]; // Track Params for the Debug Stream
2991 track.GetExternalParameters(params[0], p);
a2fbb6ec 2992 TTreeSRedirector &cs = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
393fda1c 2993 cs << "MakeTrack"
2994 << "EventNumber=" << eventNumber
2995 << "CandidateNumber=" << candidateNumber
2996 << "nc=" << nc
2997 << "X=" << params[0]
2998 << "Y=" << p[0]
2999 << "Z=" << p[1]
3000 << "snp=" << p[2]
3001 << "tnd=" << p[3]
3002 << "crv=" << p[4]
3003 << "Yin=" << params[1]
3004 << "Zin=" << params[2]
3005 << "snpin=" << params[3]
3006 << "tndin=" << params[4]
3007 << "crvin=" << params[5]
3008 << "track.=" << &track
3009 << "\n";
3010 }
4d6aee34 3011 if (nc < 30) return NULL;
d20df6fc 3012
3013 AliTRDtrackV1 *ptrTrack = SetTrack(&track);
4d6aee34 3014 ptrTrack->SetReconstructor(fkReconstructor);
48f8adf3 3015 ptrTrack->CookLabel(.9);
24253b0a 3016
d20df6fc 3017 // computes PID for track
3018 ptrTrack->CookPID();
3019 // update calibration references using this track
48f8adf3 3020 AliTRDCalibraFillHisto *calibra = AliTRDCalibraFillHisto::Instance();
3021 if (!calibra){
3022 AliInfo("Could not get Calibra instance\n");
3023 if(calibra->GetHisto2d()) calibra->UpdateHistogramsV1(ptrTrack);
3024 }
d20df6fc 3025 return ptrTrack;
e4f2f73d 3026}
3027
0906e73e 3028
e4f2f73d 3029//____________________________________________________________________
eb38ed55 3030Int_t AliTRDtrackerV1::ImproveSeedQuality(AliTRDtrackingChamber **stack, AliTRDseedV1 *cseed)
e4f2f73d 3031{
41702fec 3032 //
3033 // Sort tracklets according to "quality" and try to "improve" the first 4 worst
3034 //
3035 // Parameters :
3036 // layers : Array of propagation layers for a stack/supermodule
3037 // cseed : Array of 6 seeding tracklets which has to be improved
3038 //
f29f13a6 3039 // Output :
41702fec 3040 // cssed : Improved seeds
3041 //
3042 // Detailed description
3043 //
3044 // Iterative procedure in which new clusters are searched for each
3045 // tracklet seed such that the seed quality (see AliTRDseed::GetQuality())
3046 // can be maximized. If some optimization is found the old seeds are replaced.
3047 //
3048 // debug level: 7
3049 //
3050
3051 // make a local working copy
4d6aee34 3052 AliTRDtrackingChamber *chamber = NULL;
980d5a2a 3053 AliTRDseedV1 bseed[AliTRDgeometry::kNlayer];
3054
3055 Float_t quality(0.),
3056 lQuality[] = {1.e3, 1.e3, 1.e3, 1.e3, 1.e3, 1.e3};
3057 Int_t rLayers(0);
3058 for(Int_t jLayer=AliTRDgeometry::kNlayer; jLayer--;){
3059 bseed[jLayer] = cseed[jLayer];
3060 if(!bseed[jLayer].IsOK()) continue;
3061 rLayers++;
3062 lQuality[jLayer] = bseed[jLayer].GetQuality(kTRUE);
3063 quality += lQuality[jLayer];
3064 }
3065 Float_t chi2 = FitTiltedRieman(bseed, kTRUE);
41702fec 3066
3067 for (Int_t iter = 0; iter < 4; iter++) {
560e5c05 3068 AliDebug(2, Form("Iter[%d] Q[%f] chi2[%f]", iter, quality, chi2));
3069
980d5a2a 3070 // Try better cluster set
3071 Int_t nLayers(0); Float_t qualitynew(0.);
3072 Int_t indexes[6];
3073 TMath::Sort(Int_t(AliTRDgeometry::kNlayer), lQuality, indexes, kFALSE);
3074 for(Int_t jLayer=AliTRDgeometry::kNlayer; jLayer--;) {
3075 Int_t bLayer = indexes[jLayer];
3076 bseed[bLayer].Reset("c");
41702fec 3077 if(!(chamber = stack[bLayer])) continue;
980d5a2a 3078 if(!bseed[bLayer].AttachClusters(chamber, kTRUE)) continue;
f29f13a6 3079 bseed[bLayer].Fit(kTRUE);
980d5a2a 3080 if(!bseed[bLayer].IsOK()) continue;
3081 nLayers++;
3082 lQuality[jLayer] = bseed[jLayer].GetQuality(kTRUE);
3083 qualitynew += lQuality[jLayer];
41702fec 3084 }
980d5a2a 3085 if(rLayers > nLayers){
3086 AliDebug(1, Form("Lost %d tracklets while improving.", rLayers-nLayers));
3087 break;
3088 } else rLayers=nLayers;
3089
3090 if(qualitynew >= quality){
3091 AliDebug(4, Form("Quality worsen in iter[%d].", iter));
3092 break;
3093 } else quality = qualitynew;
3094
3095 // try improve track parameters
3096 AliTRDseedV1 tseed[AliTRDgeometry::kNlayer];
3097 for(Int_t jLayer=AliTRDgeometry::kNlayer; jLayer--;) tseed[jLayer]=bseed[jLayer];
3098 Float_t chi2new = FitTiltedRieman(tseed, kTRUE);
3099 if(chi2new > chi2){
3100 AliDebug(4, Form("Chi2 worsen in iter[%d].", iter));
3101 break;
3102 } else chi2 = chi2new;
3103
3104 // store better tracklets
3105 for(Int_t jLayer=AliTRDgeometry::kNlayer; jLayer--;) bseed[jLayer]=tseed[jLayer];
3106
41702fec 3107
a2fbb6ec 3108 if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) >= 7 && fkReconstructor->IsDebugStreaming()){
41702fec 3109 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
3110 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
3111 TLinearFitter *tiltedRieman = GetTiltedRiemanFitter();
a2fbb6ec 3112 TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
41702fec 3113 cstreamer << "ImproveSeedQuality"
980d5a2a 3114 << "EventNumber=" << eventNumber
3115 << "CandidateNumber=" << candidateNumber
3116 << "Iteration=" << iter
3117 << "S0.=" << &bseed[0]
3118 << "S1.=" << &bseed[1]
3119 << "S2.=" << &bseed[2]
3120 << "S3.=" << &bseed[3]
3121 << "S4.=" << &bseed[4]
3122 << "S5.=" << &bseed[5]
3123 << "FitterT.=" << tiltedRieman
3124 << "\n";
41702fec 3125 }
3126 } // Loop: iter
41702fec 3127 // we are sure that at least 2 tracklets are OK !
980d5a2a 3128 return rLayers;
e4f2f73d 3129}
3130
eb38ed55 3131//_________________________________________________________________________
4d6aee34 3132Double_t AliTRDtrackerV1::CalculateTrackLikelihood(const AliTRDseedV1 *const tracklets, Double_t *chi2){
41702fec 3133 //
3134 // Calculates the Track Likelihood value. This parameter serves as main quality criterion for
3135 // the track selection
3136 // The likelihood value containes:
3137 // - The chi2 values from the both fitters and the chi2 values in z-direction from a linear fit
3138 // - The Sum of the Parameter |slope_ref - slope_fit|/Sigma of the tracklets
3139 // For all Parameters an exponential dependency is used
3140 //
3141 // Parameters: - Array of tracklets (AliTRDseedV1) related to the track candidate
3142 // - Array of chi2 values:
3143 // * Non-Constrained Tilted Riemann fit
3144 // * Vertex-Constrained Tilted Riemann fit
3145 // * z-Direction from Linear fit
3146 // Output: - The calculated track likelihood
3147 //
3148 // debug level 2
3149 //
3150
f29f13a6 3151 Double_t chi2phi = 0, nLayers = 0;
41702fec 3152 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
3153 if(!tracklets[iLayer].IsOK()) continue;
f29f13a6 3154 chi2phi += tracklets[iLayer].GetChi2Phi();
41702fec 3155 nLayers++;
3156 }
f29f13a6 3157 chi2phi /= Float_t (nLayers - 2.0);
41702fec 3158
3159 Double_t likeChi2Z = TMath::Exp(-chi2[2] * 0.14); // Chi2Z
a2fbb6ec 3160 Double_t likeChi2TC = (fkReconstructor->GetRecoParam()->IsVertexConstrained()) ?
d20df6fc 3161 TMath::Exp(-chi2[1] * 0.677) : 1; // Constrained Tilted Riemann
6e39bde4 3162 Double_t likeChi2TR = TMath::Exp(-chi2[0] * 0.0078); // Non-constrained Tilted Riemann
3163 Double_t likeChi2Phi= TMath::Exp(-chi2phi * 3.23);//3.23
f29f13a6 3164 Double_t trackLikelihood = likeChi2Z * likeChi2TR * likeChi2Phi;
41702fec 3165
a2fbb6ec 3166 if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) >= 2 && fkReconstructor->IsDebugStreaming()){
41702fec 3167 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
3168 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
a2fbb6ec 3169 TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
41702fec 3170 cstreamer << "CalculateTrackLikelihood0"
3171 << "EventNumber=" << eventNumber
3172 << "CandidateNumber=" << candidateNumber
3173 << "LikeChi2Z=" << likeChi2Z
3174 << "LikeChi2TR=" << likeChi2TR
3175 << "LikeChi2TC=" << likeChi2TC
f29f13a6 3176 << "LikeChi2Phi=" << likeChi2Phi
41702fec 3177 << "TrackLikelihood=" << trackLikelihood
3178 << "\n";
3179 }
6e39bde4 3180
41702fec 3181 return trackLikelihood;
e4f2f73d 3182}
3183
3184//____________________________________________________________________
91834b8d 3185Double_t AliTRDtrackerV1::CookLikelihood(AliTRDseedV1 *cseed, Int_t planes[4])
e4f2f73d 3186{
41702fec 3187 //
3188 // Calculate the probability of this track candidate.
3189 //
3190 // Parameters :
3191 // cseeds : array of candidate tracklets
3192 // planes : array of seeding planes (see seeding configuration)
3193 // chi2 : chi2 values (on the Z and Y direction) from the rieman fit of the track.
3194 //
3195 // Output :
3196 // likelihood value
3197 //
3198 // Detailed description
3199 //
3200 // The track quality is estimated based on the following 4 criteria:
3201 // 1. precision of the rieman fit on the Y direction (likea)
3202 // 2. chi2 on the Y direction (likechi2y)
3203 // 3. chi2 on the Z direction (likechi2z)
3204 // 4. number of attached clusters compared to a reference value
3205 // (see AliTRDrecoParam::fkFindable) (likeN)
3206 //
3207 // The distributions for each type of probabilities are given below as of
3208 // (date). They have to be checked to assure consistency of estimation.
3209 //
3210
3211 // ratio of the total number of clusters/track which are expected to be found by the tracker.
4d6aee34 3212 const AliTRDrecoParam *fRecoPars = fkReconstructor->GetRecoParam();
41702fec 3213
91834b8d 3214 Double_t chi2y = GetChi2Y(&cseed[0]);
3215 Double_t chi2z = GetChi2Z(&cseed[0]);
3216
8ae98148 3217 Float_t nclusters = 0.;
41702fec 3218 Double_t sumda = 0.;
3219 for(UChar_t ilayer = 0; ilayer < 4; ilayer++){
3220 Int_t jlayer = planes[ilayer];
3221 nclusters += cseed[jlayer].GetN2();
e3cf3d02 3222 sumda += TMath::Abs(cseed[jlayer].GetYfit(1) - cseed[jlayer].GetYref(1));
41702fec 3223 }
8ae98148 3224 nclusters *= .25;
3225
5a2e200c 3226 Double_t likea = TMath::Exp(-sumda * fRecoPars->GetPhiSlope());
41702fec 3227 Double_t likechi2y = 0.0000000001;
4d6aee34 3228 if (fkReconstructor->IsCosmic() || chi2y < fRecoPars->GetChi2YCut()) likechi2y += TMath::Exp(-TMath::Sqrt(chi2y) * fRecoPars->GetChi2YSlope());
5a2e200c 3229 Double_t likechi2z = TMath::Exp(-chi2z * fRecoPars->GetChi2ZSlope());
8ae98148 3230 Double_t likeN = TMath::Exp(-(fRecoPars->GetNMeanClusters() - nclusters) / fRecoPars->GetNSigmaClusters());
41702fec 3231 Double_t like = likea * likechi2y * likechi2z * likeN;
3232
a2fbb6ec 3233 if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) >= 2 && fkReconstructor->IsDebugStreaming()){
41702fec 3234 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
3235 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
4d6aee34 3236 Int_t nTracklets = 0; Float_t meanNcls = 0;
91834b8d 3237 for(Int_t iseed=0; iseed < kNPlanes; iseed++){
3238 if(!cseed[iseed].IsOK()) continue;
3239 nTracklets++;
4d6aee34 3240 meanNcls += cseed[iseed].GetN2();
91834b8d 3241 }
4d6aee34 3242 if(nTracklets) meanNcls /= nTracklets;
41702fec 3243 // The Debug Stream contains the seed
a2fbb6ec 3244 TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
41702fec 3245 cstreamer << "CookLikelihood"
3246 << "EventNumber=" << eventNumber
3247 << "CandidateNumber=" << candidateNumber
3248 << "tracklet0.=" << &cseed[0]
3249 << "tracklet1.=" << &cseed[1]
3250 << "tracklet2.=" << &cseed[2]
3251 << "tracklet3.=" << &cseed[3]
3252 << "tracklet4.=" << &cseed[4]
3253 << "tracklet5.=" << &cseed[5]
3254 << "sumda=" << sumda
91834b8d 3255 << "chi2y=" << chi2y
3256 << "chi2z=" << chi2z
41702fec 3257 << "likea=" << likea
3258 << "likechi2y=" << likechi2y
3259 << "likechi2z=" << likechi2z
3260 << "nclusters=" << nclusters
3261 << "likeN=" << likeN
3262 << "like=" << like
4d6aee34 3263 << "meanncls=" << meanNcls
41702fec 3264 << "\n";
3265 }
3266
3267 return like;
e4f2f73d 3268}
3269
e4f2f73d 3270//____________________________________________________________________
0906e73e 3271void AliTRDtrackerV1::GetSeedingConfig(Int_t iconfig, Int_t planes[4])
e4f2f73d 3272{
41702fec 3273 //
3274 // Map seeding configurations to detector planes.
3275 //
3276 // Parameters :
3277 // iconfig : configuration index
3278 // planes : member planes of this configuration. On input empty.
3279 //
3280 // Output :
3281 // planes : contains the planes which are defining the configuration
3282 //
3283 // Detailed description
3284 //
3285 // Here is the list of seeding planes configurations together with
3286 // their topological classification:
3287 //
3288 // 0 - 5432 TQ 0
3289 // 1 - 4321 TQ 0
3290 // 2 - 3210 TQ 0
3291 // 3 - 5321 TQ 1
3292 // 4 - 4210 TQ 1
3293 // 5 - 5431 TQ 1
3294 // 6 - 4320 TQ 1
3295 // 7 - 5430 TQ 2
3296 // 8 - 5210 TQ 2
3297 // 9 - 5421 TQ 3
3298 // 10 - 4310 TQ 3
3299 // 11 - 5410 TQ 4
3300 // 12 - 5420 TQ 5
3301 // 13 - 5320 TQ 5
3302 // 14 - 5310 TQ 5
3303 //
3304 // The topologic quality is modeled as follows:
3305 // 1. The general model is define by the equation:
3306 // p(conf) = exp(-conf/2)
3307 // 2. According to the topologic classification, configurations from the same
3308 // class are assigned the agerage value over the model values.
3309 // 3. Quality values are normalized.
3310 //
3311 // The topologic quality distribution as function of configuration is given below:
3312 //Begin_Html
3313 // <img src="gif/topologicQA.gif">
3314 //End_Html
3315 //
3316
3317 switch(iconfig){
3318 case 0: // 5432 TQ 0
3319 planes[0] = 2;
3320 planes[1] = 3;
3321 planes[2] = 4;
3322 planes[3] = 5;
3323 break;
3324 case 1: // 4321 TQ 0
3325 planes[0] = 1;
3326 planes[1] = 2;
3327 planes[2] = 3;
3328 planes[3] = 4;
3329 break;
3330 case 2: // 3210 TQ 0
3331 planes[0] = 0;
3332 planes[1] = 1;
3333 planes[2] = 2;
3334 planes[3] = 3;
3335 break;
3336 case 3: // 5321 TQ 1
3337 planes[0] = 1;
3338 planes[1] = 2;
3339 planes[2] = 3;
3340 planes[3] = 5;
3341 break;
3342 case 4: // 4210 TQ 1
3343 planes[0] = 0;
3344 planes[1] = 1;
3345 planes[2] = 2;
3346 planes[3] = 4;
3347 break;
3348 case 5: // 5431 TQ 1
3349 planes[0] = 1;
3350 planes[1] = 3;
3351 planes[2] = 4;
3352 planes[3] = 5;
3353 break;
3354 case 6: // 4320 TQ 1
3355 planes[0] = 0;
3356 planes[1] = 2;
3357 planes[2] = 3;
3358 planes[3] = 4;
3359 break;
3360 case 7: // 5430 TQ 2
3361 planes[0] = 0;
3362 planes[1] = 3;
3363 planes[2] = 4;
3364 planes[3] = 5;
3365 break;
3366 case 8: // 5210 TQ 2
3367 planes[0] = 0;
3368 planes[1] = 1;
3369 planes[2] = 2;
3370 planes[3] = 5;
3371 break;
3372 case 9: // 5421 TQ 3
3373 planes[0] = 1;
3374 planes[1] = 2;
3375 planes[2] = 4;
3376 planes[3] = 5;
3377 break;
3378 case 10: // 4310 TQ 3
3379 planes[0] = 0;
3380 planes[1] = 1;
3381 planes[2] = 3;
3382 planes[3] = 4;
3383 break;
3384 case 11: // 5410 TQ 4
3385 planes[0] = 0;
3386 planes[1] = 1;
3387 planes[2] = 4;
3388 planes[3] = 5;
3389 break;
3390 case 12: // 5420 TQ 5
3391 planes[0] = 0;
3392 planes[1] = 2;
3393 planes[2] = 4;
3394 planes[3] = 5;
3395 break;
3396 case 13: // 5320 TQ 5
3397 planes[0] = 0;
3398 planes[1] = 2;
3399 planes[2] = 3;
3400 planes[3] = 5;
3401 break;
3402 case 14: // 5310 TQ 5
3403 planes[0] = 0;
3404 planes[1] = 1;
3405 planes[2] = 3;
3406 planes[3] = 5;
3407 break;
3408 }
e4f2f73d 3409}
3410
3411//____________________________________________________________________
0906e73e 3412void AliTRDtrackerV1::GetExtrapolationConfig(Int_t iconfig, Int_t planes[2])
e4f2f73d 3413{
41702fec 3414 //
3415 // Returns the extrapolation planes for a seeding configuration.
3416 //
3417 // Parameters :
3418 // iconfig : configuration index
3419 // planes : planes which are not in this configuration. On input empty.
3420 //
3421 // Output :
3422 // planes : contains the planes which are not in the configuration
3423 //
3424 // Detailed description
3425 //
3426
3427 switch(iconfig){
3428 case 0: // 5432 TQ 0
3429 planes[0] = 1;
3430 planes[1] = 0;
3431 break;
3432 case 1: // 4321 TQ 0
3433 planes[0] = 5;
3434 planes[1] = 0;
3435 break;
3436 case 2: // 3210 TQ 0
3437 planes[0] = 4;
3438 planes[1] = 5;
3439 break;
3440 case 3: // 5321 TQ 1
3441 planes[0] = 4;
3442 planes[1] = 0;
3443 break;
3444 case 4: // 4210 TQ 1
3445 planes[0] = 5;
3446 planes[1] = 3;
3447 break;
3448 case 5: // 5431 TQ 1
3449 planes[0] = 2;
3450 planes[1] = 0;
3451 break;
3452 case 6: // 4320 TQ 1
3453 planes[0] = 5;
3454 planes[1] = 1;
3455 break;
3456 case 7: // 5430 TQ 2
3457 planes[0] = 2;
3458 planes[1] = 1;
3459 break;
3460 case 8: // 5210 TQ 2
3461 planes[0] = 4;
3462 planes[1] = 3;
3463 break;
3464 case 9: // 5421 TQ 3
3465 planes[0] = 3;
3466 planes[1] = 0;
3467 break;
3468 case 10: // 4310 TQ 3
3469 planes[0] = 5;
3470 planes[1] = 2;
3471 break;
3472 case 11: // 5410 TQ 4
3473 planes[0] = 3;
3474 planes[1] = 2;
3475 break;
3476 case 12: // 5420 TQ 5
3477 planes[0] = 3;
3478 planes[1] = 1;
3479 break;
3480 case 13: // 5320 TQ 5
3481 planes[0] = 4;
3482 planes[1] = 1;
3483 break;
3484 case 14: // 5310 TQ 5
3485 planes[0] = 4;
3486 planes[1] = 2;
3487 break;
3488 }
e4f2f73d 3489}
eb38ed55 3490
3491//____________________________________________________________________
3492AliCluster* AliTRDtrackerV1::GetCluster(Int_t idx) const
3493{
41702fec 3494 Int_t ncls = fClusters->GetEntriesFast();
4d6aee34 3495 return idx >= 0 && idx < ncls ? (AliCluster*)fClusters->UncheckedAt(idx) : NULL;
eb38ed55 3496}
3497
3b57a3f7 3498//____________________________________________________________________
3499AliTRDseedV1* AliTRDtrackerV1::GetTracklet(Int_t idx) const
3500{
41702fec 3501 Int_t ntrklt = fTracklets->GetEntriesFast();
4d6aee34 3502 return idx >= 0 && idx < ntrklt ? (AliTRDseedV1*)fTracklets->UncheckedAt(idx) : NULL;
3b57a3f7 3503}
3504
3505//____________________________________________________________________
3506AliKalmanTrack* AliTRDtrackerV1::GetTrack(Int_t idx) const
3507{
41702fec 3508 Int_t ntrk = fTracks->GetEntriesFast();
4d6aee34 3509 return idx >= 0 && idx < ntrk ? (AliKalmanTrack*)fTracks->UncheckedAt(idx) : NULL;
3b57a3f7 3510}
3511
6e39bde4 3512
eb38ed55 3513
fac58f00 3514// //_____________________________________________________________________________
3515// Int_t AliTRDtrackerV1::Freq(Int_t n, const Int_t *inlist
3516// , Int_t *outlist, Bool_t down)
3517// {
3518// //
3519// // Sort eleements according occurancy
3520// // The size of output array has is 2*n
3521// //
3522//
3523// if (n <= 0) {
3524// return 0;
3525// }
3526//
3527// Int_t *sindexS = new Int_t[n]; // Temporary array for sorting
3528// Int_t *sindexF = new Int_t[2*n];
3529// for (Int_t i = 0; i < n; i++) {
3530// sindexF[i] = 0;
3531// }
3532//
3533// TMath::Sort(n,inlist,sindexS,down);
3534//
3535// Int_t last = inlist[sindexS[0]];
3536// Int_t val = last;
3537// sindexF[0] = 1;
3538// sindexF[0+n] = last;
3539// Int_t countPos = 0;
3540//
3541// // Find frequency
3542// for (Int_t i = 1; i < n; i++) {
3543// val = inlist[sindexS[i]];
3544// if (last == val) {
3545// sindexF[countPos]++;
3546// }
3547// else {
3548// countPos++;
3549// sindexF[countPos+n] = val;
3550// sindexF[countPos]++;
3551// last = val;
3552// }
3553// }
3554// if (last == val) {
3555// countPos++;
3556// }
3557//
3558// // Sort according frequency
3559// TMath::Sort(countPos,sindexF,sindexS,kTRUE);
3560//
3561// for (Int_t i = 0; i < countPos; i++) {
3562// outlist[2*i ] = sindexF[sindexS[i]+n];
3563// outlist[2*i+1] = sindexF[sindexS[i]];
3564// }
3565//
3566// delete [] sindexS;
3567// delete [] sindexF;
3568//
3569// return countPos;
3570//
3571// }
bb56afff 3572
06b32d95 3573
d611c74f 3574//____________________________________________________________________
3575void AliTRDtrackerV1::ResetSeedTB()
3576{
3577// reset buffer for seeding time bin layers. If the time bin
3578// layers are not allocated this function allocates them
3579
3580 for(Int_t isl=0; isl<kNSeedPlanes; isl++){
3581 if(!fSeedTB[isl]) fSeedTB[isl] = new AliTRDchamberTimeBin();
3582 else fSeedTB[isl]->Clear();
3583 }
3584}
3585
e3cf3d02 3586
3587//_____________________________________________________________________________
4d6aee34 3588Float_t AliTRDtrackerV1::GetChi2Y(const AliTRDseedV1 * const tracklets) const
e3cf3d02 3589{
3590 // Calculates normalized chi2 in y-direction
3591 // chi2 = Sum chi2 / n_tracklets
3592
3593 Double_t chi2 = 0.; Int_t n = 0;
3594 for(Int_t ipl = kNPlanes; ipl--;){
3595 if(!tracklets[ipl].IsOK()) continue;
3596 chi2 += tracklets[ipl].GetChi2Y();
3597 n++;
3598 }
3599 return n ? chi2/n : 0.;
3600}
3601
bb56afff 3602//_____________________________________________________________________________
4d6aee34 3603Float_t AliTRDtrackerV1::GetChi2Z(const AliTRDseedV1 *const tracklets) const
bb56afff 3604{
91834b8d 3605 // Calculates normalized chi2 in z-direction
e3cf3d02 3606 // chi2 = Sum chi2 / n_tracklets
41702fec 3607
e3cf3d02 3608 Double_t chi2 = 0; Int_t n = 0;
3609 for(Int_t ipl = kNPlanes; ipl--;){
41702fec 3610 if(!tracklets[ipl].IsOK()) continue;
e3cf3d02 3611 chi2 += tracklets[ipl].GetChi2Z();
3612 n++;
41702fec 3613 }
e3cf3d02 3614 return n ? chi2/n : 0.;
bb56afff 3615}
8acca6a3 3616
6e39bde4 3617//____________________________________________________________________
4d6aee34 3618Float_t AliTRDtrackerV1::CalculateReferenceX(const AliTRDseedV1 *const tracklets){
6e39bde4 3619 //
3620 // Calculates the reference x-position for the tilted Rieman fit defined as middle
3621 // of the stack (middle between layers 2 and 3). For the calculation all the tracklets
3622 // are taken into account
3623 //
3624 // Parameters: - Array of tracklets(AliTRDseedV1)
3625 //
3626 // Output: - The reference x-position(Float_t)
3627 // Only kept for compatibility with the old code
3628 //
3629 Int_t nDistances = 0;
3630 Float_t meanDistance = 0.;
3631 Int_t startIndex = 5;
3632 for(Int_t il =5; il > 0; il--){
3633 if(tracklets[il].IsOK() && tracklets[il -1].IsOK()){
3634 Float_t xdiff = tracklets[il].GetX0() - tracklets[il -1].GetX0();
3635 meanDistance += xdiff;
3636 nDistances++;
3637 }
3638 if(tracklets[il].IsOK()) startIndex = il;
3639 }
3640 if(tracklets[0].IsOK()) startIndex = 0;
3641 if(!nDistances){
3642 // We should normally never get here
3643 Float_t xpos[2]; memset(xpos, 0, sizeof(Float_t) * 2);
3644 Int_t iok = 0, idiff = 0;
3645 // This attempt is worse and should be avoided:
3646 // check for two chambers which are OK and repeat this without taking the mean value
3647 // Strategy avoids a division by 0;
3648 for(Int_t il = 5; il >= 0; il--){
3649 if(tracklets[il].IsOK()){
3650 xpos[iok] = tracklets[il].GetX0();
3651 iok++;
3652 startIndex = il;
3653 }
3654 if(iok) idiff++; // to get the right difference;
3655 if(iok > 1) break;
3656 }
3657 if(iok > 1){
3658 meanDistance = (xpos[0] - xpos[1])/idiff;
3659 }
3660 else{
3661 // we have do not even have 2 layers which are OK? The we do not need to fit at all
3662 return 331.;
3663 }
3664 }
3665 else{
3666 meanDistance /= nDistances;
3667 }
3668 return tracklets[startIndex].GetX0() + (2.5 - startIndex) * meanDistance - 0.5 * (AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick());
3669}
3670
3671//_____________________________________________________________________________
4d6aee34 3672Double_t AliTRDtrackerV1::FitTiltedRiemanV1(AliTRDseedV1 *const tracklets){
6e39bde4 3673 //
3674 // Track Fitter Function using the new class implementation of
3675 // the Rieman fit
3676 //
3677 AliTRDtrackFitterRieman fitter;
3678 fitter.SetRiemanFitter(GetTiltedRiemanFitter());
3679 fitter.Reset();
3680 for(Int_t il = 0; il < AliTRDgeometry::kNlayer; il++) fitter.SetTracklet(il, &tracklets[il]);
3681 Double_t chi2 = fitter.Eval();
3682 // Update the tracklets
3683 Double_t cov[15]; Double_t x0;
3684 memset(cov, 0, sizeof(Double_t) * 15);
3685 for(Int_t il = 0; il < AliTRDgeometry::kNlayer; il++){
3686 x0 = tracklets[il].GetX0();
3687 tracklets[il].SetYref(0, fitter.GetYat(x0));
3688 tracklets[il].SetZref(0, fitter.GetZat(x0));
3689 tracklets[il].SetYref(1, fitter.GetDyDxAt(x0));
3690 tracklets[il].SetZref(1, fitter.GetDzDx());
3691 tracklets[il].SetC(fitter.GetCurvature());
3692 fitter.GetCovAt(x0, cov);
3693 tracklets[il].SetCovRef(cov);
3694 tracklets[il].SetChi2(chi2);
3695 }
3696 return chi2;
3697}
3698
8acca6a3 3699///////////////////////////////////////////////////////
3700// //
3701// Resources of class AliTRDLeastSquare //
3702// //
3703///////////////////////////////////////////////////////
3704
3705//_____________________________________________________________________________
3706AliTRDtrackerV1::AliTRDLeastSquare::AliTRDLeastSquare(){
903326c1 3707//
3708// Constructor of the nested class AliTRDtrackFitterLeastSquare
3709//
3710// Fast solving linear regresion in 2D
0323ef61 3711// y=a + bx
903326c1 3712// The data members have the following meaning
0323ef61 3713// fParams[0] : a
3714// fParams[1] : b
903326c1 3715//
3716// fSums[0] : S
3717// fSums[1] : Sx
3718// fSums[2] : Sy
3719// fSums[3] : Sxy
3720// fSums[4] : Sxx
3721// fSums[5] : Syy
3722//
0323ef61 3723// fCovarianceMatrix[0] : s2a
3724// fCovarianceMatrix[1] : s2b
903326c1 3725// fCovarianceMatrix[2] : cov(ab)
3726
41702fec 3727 memset(fParams, 0, sizeof(Double_t) * 2);
341512a4 3728 memset(fSums, 0, sizeof(Double_t) * 6);
41702fec 3729 memset(fCovarianceMatrix, 0, sizeof(Double_t) * 3);
8acca6a3 3730
3731}
3732
3733//_____________________________________________________________________________
4d6aee34 3734void AliTRDtrackerV1::AliTRDLeastSquare::AddPoint(const Double_t *const x, Double_t y, Double_t sigmaY){
41702fec 3735 //
3736 // Adding Point to the fitter
3737 //
5f1ae1e7 3738
2ed81ab2 3739 Double_t weight = 1/(sigmaY > 1e-9 ? sigmaY : 1e-9);
3740 weight *= weight;
4d6aee34 3741 const Double_t &xpt = *x;
41702fec 3742 // printf("Adding point x = %f, y = %f, sigma = %f\n", xpt, y, sigmaY);
3743 fSums[0] += weight;
3744 fSums[1] += weight * xpt;
3745 fSums[2] += weight * y;
3746 fSums[3] += weight * xpt * y;
3747 fSums[4] += weight * xpt * xpt;
3748 fSums[5] += weight * y * y;
8acca6a3 3749}
3750
3751//_____________________________________________________________________________
4d6aee34 3752void AliTRDtrackerV1::AliTRDLeastSquare::RemovePoint(const Double_t *const x, Double_t y, Double_t sigmaY){
41702fec 3753 //
3754 // Remove Point from the sample
3755 //
5f1ae1e7 3756
2ed81ab2 3757 Double_t weight = 1/(sigmaY > 1e-9 ? sigmaY : 1e-9);
3758 weight *= weight;
4d6aee34 3759 const Double_t &xpt = *x;
41702fec 3760 fSums[0] -= weight;
3761 fSums[1] -= weight * xpt;
3762 fSums[2] -= weight * y;
3763 fSums[3] -= weight * xpt * y;
3764 fSums[4] -= weight * xpt * xpt;
3765 fSums[5] -= weight * y * y;
8acca6a3 3766}
3767
3768//_____________________________________________________________________________
903326c1 3769Bool_t AliTRDtrackerV1::AliTRDLeastSquare::Eval(){
41702fec 3770 //
3771 // Evaluation of the fit:
3772 // Calculation of the parameters
3773 // Calculation of the covariance matrix
3774 //
3775
903326c1 3776 Double_t det = fSums[0] * fSums[4] - fSums[1] *fSums[1];
3777 if(det==0) return kFALSE;
aec26713 3778
41702fec 3779 // for(Int_t isum = 0; isum < 5; isum++)
3780 // printf("fSums[%d] = %f\n", isum, fSums[isum]);
3781 // printf("denominator = %f\n", denominator);
903326c1 3782 fParams[0] = (fSums[2] * fSums[4] - fSums[1] * fSums[3])/det;
3783 fParams[1] = (fSums[0] * fSums[3] - fSums[1] * fSums[2])/det;
41702fec 3784 // printf("fParams[0] = %f, fParams[1] = %f\n", fParams[0], fParams[1]);
3785
3786 // Covariance matrix
0323ef61 3787 Double_t den = fSums[0]*fSums[4] - fSums[1]*fSums[1];
3788 fCovarianceMatrix[0] = fSums[4] / den;
3789 fCovarianceMatrix[1] = fSums[0] / den;
3790 fCovarianceMatrix[2] = -fSums[1] / den;
3791/* fCovarianceMatrix[0] = fSums[4] / fSums[0] - fSums[1] * fSums[1] / (fSums[0] * fSums[0]);
2ed81ab2 3792 fCovarianceMatrix[1] = fSums[5] / fSums[0] - fSums[2] * fSums[2] / (fSums[0] * fSums[0]);
0323ef61 3793 fCovarianceMatrix[2] = fSums[3] / fSums[0] - fSums[1] * fSums[2] / (fSums[0] * fSums[0]);*/
3794
3795
3796
903326c1 3797 return kTRUE;
8acca6a3 3798}
3799
46b6abd7 3800//_____________________________________________________________________________
4d6aee34 3801Double_t AliTRDtrackerV1::AliTRDLeastSquare::GetFunctionValue(const Double_t *const xpos) const {
41702fec 3802 //
3803 // Returns the Function value of the fitted function at a given x-position
3804 //
3805 return fParams[0] + fParams[1] * (*xpos);
46b6abd7 3806}
3807
3808//_____________________________________________________________________________
3809void AliTRDtrackerV1::AliTRDLeastSquare::GetCovarianceMatrix(Double_t *storage) const {
41702fec 3810 //
3811 // Copies the values of the covariance matrix into the storage
3812 //
3813 memcpy(storage, fCovarianceMatrix, sizeof(Double_t) * 3);
46b6abd7 3814}
3815
6e39bde4 3816//_____________________________________________________________________________
3817void AliTRDtrackerV1::AliTRDLeastSquare::Reset(){
3818 //
3819 // Reset the fitter
3820 //
3821 memset(fParams, 0, sizeof(Double_t) * 2);
3822 memset(fCovarianceMatrix, 0, sizeof(Double_t) * 3);
3823 memset(fSums, 0, sizeof(Double_t) * 6);
3824}
3825
3826///////////////////////////////////////////////////////
3827// //
3828// Resources of class AliTRDtrackFitterRieman //
3829// //
3830///////////////////////////////////////////////////////
3831
3832//_____________________________________________________________________________
3833AliTRDtrackerV1::AliTRDtrackFitterRieman::AliTRDtrackFitterRieman():
3834 fTrackFitter(NULL),
3835 fZfitter(NULL),
3836 fCovarPolY(NULL),
3837 fCovarPolZ(NULL),
3838 fXref(0.),
3839 fSysClusterError(0.)
3840{
3841 //
3842 // Default constructor
3843 //
3844 fZfitter = new AliTRDLeastSquare;
3845 fCovarPolY = new TMatrixD(3,3);
3846 fCovarPolZ = new TMatrixD(2,2);
3847 memset(fTracklets, 0, sizeof(AliTRDseedV1 *) * 6);
3848 memset(fParameters, 0, sizeof(Double_t) * 5);
3849 memset(fSumPolY, 0, sizeof(Double_t) * 5);
3850 memset(fSumPolZ, 0, sizeof(Double_t) * 2);
3851}
3852
3853//_____________________________________________________________________________
3854AliTRDtrackerV1::AliTRDtrackFitterRieman::~AliTRDtrackFitterRieman(){
3855 //
3856 // Destructor
3857 //
3858 if(fZfitter) delete fZfitter;
3859 if(fCovarPolY) delete fCovarPolY;
3860 if(fCovarPolZ) delete fCovarPolZ;
3861}
3862
3863//_____________________________________________________________________________
3864void AliTRDtrackerV1::AliTRDtrackFitterRieman::Reset(){
3865 //
3866 // Reset the Fitter
3867 //
3868 if(fTrackFitter){
3869 fTrackFitter->StoreData(kTRUE);
3870 fTrackFitter->ClearPoints();
3871 }
3872 if(fZfitter){
3873 fZfitter->Reset();
3874 }
3875 fXref = 0.;
3876 memset(fTracklets, 0, sizeof(AliTRDseedV1 *) * AliTRDgeometry::kNlayer);
3877 memset(fParameters, 0, sizeof(Double_t) * 5);
3878 memset(fSumPolY, 0, sizeof(Double_t) * 5);
3879 memset(fSumPolZ, 0, sizeof(Double_t) * 2);
3880 for(Int_t irow = 0; irow < fCovarPolY->GetNrows(); irow++)
3881 for(Int_t icol = 0; icol < fCovarPolY->GetNcols(); icol++){
3882 (*fCovarPolY)(irow, icol) = 0.;
3883 if(irow < 2 && icol < 2)
3884 (*fCovarPolZ)(irow, icol) = 0.;
3885 }
3886}
3887
3888//_____________________________________________________________________________
3889void AliTRDtrackerV1::AliTRDtrackFitterRieman::SetTracklet(Int_t itr, AliTRDseedV1 *tracklet){
3890 //
3891 // Add tracklet into the fitter
3892 //
3893 if(itr >= AliTRDgeometry::kNlayer) return;
3894 fTracklets[itr] = tracklet;
3895}
3896
3897//_____________________________________________________________________________
3898Double_t AliTRDtrackerV1::AliTRDtrackFitterRieman::Eval(){
3899 //
3900 // Perform the fit
3901 // 1. Apply linear transformation and store points in the fitter
3902 // 2. Evaluate the fit
3903 // 3. Check if the result of the fit in z-direction is reasonable
3904 // if not
3905 // 3a. Fix the parameters 3 and 4 with the results of a simple least
3906 // square fit
3907 // 3b. Redo the fit with the fixed parameters
3908 // 4. Store fit results (parameters and errors)
3909 //
3910 if(!fTrackFitter){
3911 return 1e10;
3912 }
3913 fXref = CalculateReferenceX();
3914 for(Int_t il = 0; il < AliTRDgeometry::kNlayer; il++) UpdateFitters(fTracklets[il]);
3915 if(!fTrackFitter->GetNpoints()) return 1e10;
3916 // perform the fit
3917 fTrackFitter->Eval();
3918 fZfitter->Eval();
3919 fParameters[3] = fTrackFitter->GetParameter(3);
3920 fParameters[4] = fTrackFitter->GetParameter(4);
3921 if(!CheckAcceptable(fParameters[3], fParameters[4])) {
3922 fTrackFitter->FixParameter(3, fZfitter->GetFunctionValue(&fXref));
3923 fTrackFitter->FixParameter(4, fZfitter->GetFunctionParameter(1));
3924 fTrackFitter->Eval();
3925 fTrackFitter->ReleaseParameter(3);
3926 fTrackFitter->ReleaseParameter(4);
3927 fParameters[3] = fTrackFitter->GetParameter(3);
3928 fParameters[4] = fTrackFitter->GetParameter(4);
3929 }
3930 // Update the Fit Parameters and the errors
3931 fParameters[0] = fTrackFitter->GetParameter(0);
3932 fParameters[1] = fTrackFitter->GetParameter(1);
3933 fParameters[2] = fTrackFitter->GetParameter(2);
3934
3935 // Prepare Covariance estimation
3936 (*fCovarPolY)(0,0) = fSumPolY[0]; (*fCovarPolY)(1,1) = fSumPolY[2]; (*fCovarPolY)(2,2) = fSumPolY[4];
3937 (*fCovarPolY)(1,0) = (*fCovarPolY)(0,1) = fSumPolY[1];
3938 (*fCovarPolY)(2,0) = (*fCovarPolY)(0,2) = fSumPolY[2];
3939 (*fCovarPolY)(2,1) = (*fCovarPolY)(1,2) = fSumPolY[3];
3940 fCovarPolY->Invert();
3941 (*fCovarPolZ)(0,0) = fSumPolZ[0]; (*fCovarPolZ)(1,1) = fSumPolZ[2];
3942 (*fCovarPolZ)(1,0) = (*fCovarPolZ)(0,1) = fSumPolZ[1];
3943 fCovarPolZ->Invert();
3944 return fTrackFitter->GetChisquare() / fTrackFitter->GetNpoints();
3945}
3946
3947//_____________________________________________________________________________
4d6aee34 3948void AliTRDtrackerV1::AliTRDtrackFitterRieman::UpdateFitters(AliTRDseedV1 * const tracklet){
6e39bde4 3949 //
3950 // Does the transformations and updates the fitters
3951 // The following transformation is applied
3952 //
3953 AliTRDcluster *cl = NULL;
3954 Double_t x, y, z, dx, t, w, we, yerr, zerr;
3955 Double_t uvt[4];
3956 if(!tracklet || !tracklet->IsOK()) return;
3957 Double_t tilt = tracklet->GetTilt();
3958 for(Int_t itb = 0; itb < AliTRDseedV1::kNclusters; itb++){
3959 if(!(cl = tracklet->GetClusters(itb))) continue;
3960 if(!cl->IsInChamber()) continue;
3961 if (!tracklet->IsUsable(itb)) continue;
3962 x = cl->GetX();
3963 y = cl->GetY();
3964 z = cl->GetZ();
3965 dx = x - fXref;
3966 // Transformation
3967 t = 1./(x*x + y*y);
3968 uvt[0] = 2. * x * t;
3969 uvt[1] = t;
3970 uvt[2] = 2. * tilt * t;
3971 uvt[3] = 2. * tilt * dx * t;
3972 w = 2. * (y + tilt*z) * t;
3973 // error definition changes for the different calls
3974 we = 2. * t;
3975 we *= TMath::Sqrt(cl->GetSigmaY2()+tilt*tilt*cl->GetSigmaZ2());
3976 // Update sums for error calculation
3977 yerr = 1./(TMath::Sqrt(cl->GetSigmaY2()) + fSysClusterError);
3978 yerr *= yerr;
3979 zerr = 1./cl->GetSigmaZ2();
3980 for(Int_t ipol = 0; ipol < 5; ipol++){
3981 fSumPolY[ipol] += yerr;
3982 yerr *= x;
3983 if(ipol < 3){
3984 fSumPolZ[ipol] += zerr;
3985 zerr *= x;
3986 }
3987 }
3988 fTrackFitter->AddPoint(uvt, w, we);
3989 fZfitter->AddPoint(&x, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
3990 }
3991}
3992
3993//_____________________________________________________________________________
3994Bool_t AliTRDtrackerV1::AliTRDtrackFitterRieman::CheckAcceptable(Double_t offset, Double_t slope){
3995 //
3996 // Check whether z-results are acceptable
3997 // Definition: Distance between tracklet fit and track fit has to be
3998 // less then half a padlength
3999 // Point of comparision is at the anode wire
4000 //
4001 Bool_t acceptablez = kTRUE;
4002 Double_t zref = 0.0;
4003 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
4004 if(!fTracklets[iLayer]->IsOK()) continue;
4005 zref = offset + slope * (fTracklets[iLayer]->GetX0() - fXref);
4006 if (TMath::Abs(fTracklets[iLayer]->GetZfit(0) - zref) > fTracklets[iLayer]->GetPadLength() * 0.5 + 1.0)
4007 acceptablez = kFALSE;
4008 }
4009 return acceptablez;
4010}
4011
4012//_____________________________________________________________________________
4013Double_t AliTRDtrackerV1::AliTRDtrackFitterRieman::GetYat(Double_t x) const {
4014 //
4015 // Calculate y position out of the track parameters
4016 // y: R^2 = (x - x0)^2 + (y - y0)^2
4017 // => y = y0 +/- Sqrt(R^2 - (x - x0)^2)
4018 // R = Sqrt() = 1/Curvature
4019 // => y = y0 +/- Sqrt(1/Curvature^2 - (x - x0)^2)
4020 //
4021 Double_t y = 0;
4022 Double_t disc = (x * fParameters[0] + fParameters[1]);
4023 disc = 1 - fParameters[0]*fParameters[2] + fParameters[1]*fParameters[1] - disc*disc;
4024 if (disc >= 0) {
4025 disc = TMath::Sqrt(disc);
4026 y = (1.0 - disc) / fParameters[0];
4027 }
4028 return y;
4029}
4030
4031//_____________________________________________________________________________
4032Double_t AliTRDtrackerV1::AliTRDtrackFitterRieman::GetZat(Double_t x) const {
4033 //
4034 // Return z position for a given x position
4035 // Simple linear function
4036 //
4037 return fParameters[3] + fParameters[4] * (x - fXref);
4038}
4039
4040//_____________________________________________________________________________
4041Double_t AliTRDtrackerV1::AliTRDtrackFitterRieman::GetDyDxAt(Double_t x) const {
4042 //
4043 // Calculate dydx at a given radial position out of the track parameters
4044 // dy: R^2 = (x - x0)^2 + (y - y0)^2
4045 // => y = +/- Sqrt(R^2 - (x - x0)^2) + y0
4046 // => dy/dx = (x - x0)/Sqrt(R^2 - (x - x0)^2)
4047 // Curvature: cr = 1/R = a/Sqrt(1 + b^2 - c*a)
4048 // => dy/dx = (x - x0)/(1/(cr^2) - (x - x0)^2)
4049 //
4050 Double_t x0 = -fParameters[1] / fParameters[0];
4051 Double_t curvature = GetCurvature();
4052 Double_t dy = 0;
4053 if (-fParameters[2] * fParameters[0] + fParameters[1] * fParameters[1] + 1 > 0) {
4054 if (1.0/(curvature * curvature) - (x - x0) * (x - x0) > 0.0) {
4055 Double_t yderiv = (x - x0) / TMath::Sqrt(1.0/(curvature * curvature) - (x - x0) * (x - x0));
4056 if (fParameters[0] < 0) yderiv *= -1.0;
4057 dy = yderiv;
4058 }
4059 }
4060 return dy;
4061}
4062
4063//_____________________________________________________________________________
4064Double_t AliTRDtrackerV1::AliTRDtrackFitterRieman::GetCurvature() const {
4065 //
4066 // Calculate track curvature
4067 //
4068 //
4069 Double_t curvature = 1.0 + fParameters[1]*fParameters[1] - fParameters[2]*fParameters[0];
4070 if (curvature > 0.0)
4071 curvature = fParameters[0] / TMath::Sqrt(curvature);
4072 return curvature;
4073}
4074
4075//_____________________________________________________________________________
4076void AliTRDtrackerV1::AliTRDtrackFitterRieman::GetCovAt(Double_t x, Double_t *cov) const {
4077 //
4078 // Error Definition according to gauss error propagation
4079 //
4080 TMatrixD transform(3,3);
4081 transform(0,0) = transform(1,1) = transform(2,2) = 1;
4082 transform(0,1) = transform(1,2) = x;
4083 transform(0,2) = x*x;
4084 TMatrixD covariance(transform, TMatrixD::kMult, *fCovarPolY);
4085 covariance *= transform.T();
4086 cov[0] = covariance(0,0);
4087 TMatrixD transformZ(2,2);
4088 transformZ(0,0) = transformZ(1,1) = 1;
4089 transformZ(0,1) = x;
4090 TMatrixD covarZ(transformZ, TMatrixD::kMult, *fCovarPolZ);
4091 covarZ *= transformZ.T();
4092 cov[1] = covarZ(0,0);
4093 cov[2] = 0;
4094}
4095
4096//____________________________________________________________________
4097Double_t AliTRDtrackerV1::AliTRDtrackFitterRieman::CalculateReferenceX(){
4098 //
4099 // Calculates the reference x-position for the tilted Rieman fit defined as middle
4100 // of the stack (middle between layers 2 and 3). For the calculation all the tracklets
4101 // are taken into account
4102 //
4103 // Parameters: - Array of tracklets(AliTRDseedV1)
4104 //
4105 // Output: - The reference x-position(Float_t)
4106 //
4107 Int_t nDistances = 0;
4108 Float_t meanDistance = 0.;
4109 Int_t startIndex = 5;
4110 for(Int_t il =5; il > 0; il--){
4111 if(fTracklets[il]->IsOK() && fTracklets[il -1]->IsOK()){
4112 Float_t xdiff = fTracklets[il]->GetX0() - fTracklets[il -1]->GetX0();
4113 meanDistance += xdiff;
4114 nDistances++;
4115 }
4116 if(fTracklets[il]->IsOK()) startIndex = il;
4117 }
4118 if(fTracklets[0]->IsOK()) startIndex = 0;
4119 if(!nDistances){
4120 // We should normally never get here
4121 Float_t xpos[2]; memset(xpos, 0, sizeof(Float_t) * 2);
4122 Int_t iok = 0, idiff = 0;
4123 // This attempt is worse and should be avoided:
4124 // check for two chambers which are OK and repeat this without taking the mean value
4125 // Strategy avoids a division by 0;
4126 for(Int_t il = 5; il >= 0; il--){
4127 if(fTracklets[il]->IsOK()){
4128 xpos[iok] = fTracklets[il]->GetX0();
4129 iok++;
4130 startIndex = il;
4131 }
4132 if(iok) idiff++; // to get the right difference;
4133 if(iok > 1) break;
4134 }
4135 if(iok > 1){
4136 meanDistance = (xpos[0] - xpos[1])/idiff;
4137 }
4138 else{
4139 // we have do not even have 2 layers which are OK? The we do not need to fit at all
4140 return 331.;
4141 }
4142 }
4143 else{
4144 meanDistance /= nDistances;
4145 }
4146 return fTracklets[startIndex]->GetX0() + (2.5 - startIndex) * meanDistance - 0.5 * (AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick());
4147}