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Fix for improper corrections from revision 30849
[u/mrichter/AliRoot.git] / TRD / AliTRDtrackerV1.cxx
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e4f2f73d 1/**************************************************************************
972ef65e 2* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
3* *
4* Author: The ALICE Off-line Project. *
5* Contributors are mentioned in the code where appropriate. *
6* *
7* Permission to use, copy, modify and distribute this software and its *
8* documentation strictly for non-commercial purposes is hereby granted *
9* without fee, provided that the above copyright notice appears in all *
10* copies and that both the copyright notice and this permission notice *
11* appear in the supporting documentation. The authors make no claims *
12* about the suitability of this software for any purpose. It is *
13* provided "as is" without express or implied warranty. *
14**************************************************************************/
e4f2f73d 15
16/* $Id$ */
17
18///////////////////////////////////////////////////////////////////////////////
19// //
20// Track finder //
21// //
22// Authors: //
23// Alex Bercuci <A.Bercuci@gsi.de> //
24// Markus Fasel <M.Fasel@gsi.de> //
25// //
26///////////////////////////////////////////////////////////////////////////////
27
bb56afff 28// #include <Riostream.h>
29// #include <stdio.h>
30// #include <string.h>
e4f2f73d 31
32#include <TBranch.h>
bb56afff 33#include <TDirectory.h>
e4f2f73d 34#include <TLinearFitter.h>
e4f2f73d 35#include <TTree.h>
36#include <TClonesArray.h>
e4f2f73d 37#include <TTreeStream.h>
38
39#include "AliLog.h"
40#include "AliESDEvent.h"
bb56afff 41#include "AliGeomManager.h"
e4f2f73d 42#include "AliRieman.h"
43#include "AliTrackPointArray.h"
44
e4f2f73d 45#include "AliTRDgeometry.h"
46#include "AliTRDpadPlane.h"
e4f2f73d 47#include "AliTRDcalibDB.h"
e4f2f73d 48#include "AliTRDReconstructor.h"
49#include "AliTRDCalibraFillHisto.h"
e4f2f73d 50#include "AliTRDrecoParam.h"
bb56afff 51
52#include "AliTRDcluster.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 60
e4f2f73d 61
62ClassImp(AliTRDtrackerV1)
eb38ed55 63
64
65const Float_t AliTRDtrackerV1::fgkMinClustersInTrack = 0.5; //
66const Float_t AliTRDtrackerV1::fgkLabelFraction = 0.8; //
67const Double_t AliTRDtrackerV1::fgkMaxChi2 = 12.0; //
68const Double_t AliTRDtrackerV1::fgkMaxSnp = 0.95; // Maximum local sine of the azimuthal angle
69const Double_t AliTRDtrackerV1::fgkMaxStep = 2.0; // Maximal step size in propagation
d76231c8 70Double_t AliTRDtrackerV1::fgTopologicQA[kNConfigs] = {
41702fec 71 0.1112, 0.1112, 0.1112, 0.0786, 0.0786,
72 0.0786, 0.0786, 0.0579, 0.0579, 0.0474,
73 0.0474, 0.0408, 0.0335, 0.0335, 0.0335
e4f2f73d 74};
2985ffcb 75Int_t AliTRDtrackerV1::fgNTimeBins = 0;
eb38ed55 76AliRieman* AliTRDtrackerV1::fgRieman = 0x0;
77TLinearFitter* AliTRDtrackerV1::fgTiltedRieman = 0x0;
78TLinearFitter* AliTRDtrackerV1::fgTiltedRiemanConstrained = 0x0;
e4f2f73d 79
80//____________________________________________________________________
3a039a31 81AliTRDtrackerV1::AliTRDtrackerV1(AliTRDReconstructor *rec)
41702fec 82 :AliTracker()
06b32d95 83 ,fReconstructor(0x0)
41702fec 84 ,fGeom(new AliTRDgeometry())
85 ,fClusters(0x0)
86 ,fTracklets(0x0)
87 ,fTracks(0x0)
88 ,fSieveSeeding(0)
e4f2f73d 89{
41702fec 90 //
91 // Default constructor.
92 //
a7ac01d2 93 AliTRDcalibDB *trd = 0x0;
94 if (!(trd = AliTRDcalibDB::Instance())) {
41702fec 95 AliFatal("Could not get calibration object");
96 }
a7ac01d2 97
98 if(!fgNTimeBins) fgNTimeBins = trd->GetNumberOfTimeBins();
41702fec 99
053767a4 100 for (Int_t isector = 0; isector < AliTRDgeometry::kNsector; isector++) new(&fTrSec[isector]) AliTRDtrackingSector(fGeom, isector);
3a039a31 101
d611c74f 102 for(Int_t isl =0; isl<kNSeedPlanes; isl++) fSeedTB[isl] = 0x0;
d20df6fc 103
3a039a31 104 // Initialize debug stream
06b32d95 105 if(rec) SetReconstructor(rec);
eb38ed55 106}
107
e4f2f73d 108//____________________________________________________________________
109AliTRDtrackerV1::~AliTRDtrackerV1()
110{
41702fec 111 //
112 // Destructor
113 //
114
f7ab3117 115 if(fgRieman) delete fgRieman; fgRieman = 0x0;
116 if(fgTiltedRieman) delete fgTiltedRieman; fgTiltedRieman = 0x0;
117 if(fgTiltedRiemanConstrained) delete fgTiltedRiemanConstrained; fgTiltedRiemanConstrained = 0x0;
d611c74f 118 for(Int_t isl =0; isl<kNSeedPlanes; isl++) if(fSeedTB[isl]) delete fSeedTB[isl];
41702fec 119 if(fTracks) {fTracks->Delete(); delete fTracks;}
120 if(fTracklets) {fTracklets->Delete(); delete fTracklets;}
48f8adf3 121 if(fClusters) {
122 fClusters->Delete(); delete fClusters;
123 }
41702fec 124 if(fGeom) delete fGeom;
e4f2f73d 125}
126
127//____________________________________________________________________
128Int_t AliTRDtrackerV1::Clusters2Tracks(AliESDEvent *esd)
129{
41702fec 130 //
131 // Steering stand alone tracking for full TRD detector
132 //
133 // Parameters :
134 // esd : The ESD event. On output it contains
135 // the ESD tracks found in TRD.
136 //
137 // Output :
138 // Number of tracks found in the TRD detector.
139 //
140 // Detailed description
141 // 1. Launch individual SM trackers.
142 // See AliTRDtrackerV1::Clusters2TracksSM() for details.
143 //
144
3a039a31 145 if(!fReconstructor->GetRecoParam() ){
146 AliError("Reconstruction configuration not initialized. Call first AliTRDReconstructor::SetRecoParam().");
41702fec 147 return 0;
148 }
149
150 //AliInfo("Start Track Finder ...");
151 Int_t ntracks = 0;
053767a4 152 for(int ism=0; ism<AliTRDgeometry::kNsector; ism++){
41702fec 153 // for(int ism=1; ism<2; ism++){
154 //AliInfo(Form("Processing supermodule %i ...", ism));
155 ntracks += Clusters2TracksSM(ism, esd);
156 }
157 AliInfo(Form("Number of found tracks : %d", ntracks));
158 return ntracks;
e4f2f73d 159}
160
0906e73e 161
162//_____________________________________________________________________________
eb38ed55 163Bool_t AliTRDtrackerV1::GetTrackPoint(Int_t index, AliTrackPoint &p) const
0906e73e 164{
41702fec 165 //AliInfo(Form("Asking for tracklet %d", index));
166
84eab75a 167 // reset position of the point before using it
168 p.SetXYZ(0., 0., 0.);
2f7514a6 169 AliTRDseedV1 *tracklet = GetTracklet(index);
170 if (!tracklet) return kFALSE;
84eab75a 171
41702fec 172 // get detector for this tracklet
84eab75a 173 Int_t idet = tracklet->GetDetector();
41702fec 174
175 Double_t local[3];
176 local[0] = tracklet->GetX0();
177 local[1] = tracklet->GetYfit(0);
178 local[2] = tracklet->GetZfit(0);
179 Double_t global[3];
180 fGeom->RotateBack(idet, local, global);
181 p.SetXYZ(global[0],global[1],global[2]);
182
183
184 // setting volume id
185 AliGeomManager::ELayerID iLayer = AliGeomManager::kTRD1;
053767a4 186 switch (fGeom->GetLayer(idet)) {
41702fec 187 case 0:
188 iLayer = AliGeomManager::kTRD1;
189 break;
190 case 1:
191 iLayer = AliGeomManager::kTRD2;
192 break;
193 case 2:
194 iLayer = AliGeomManager::kTRD3;
195 break;
196 case 3:
197 iLayer = AliGeomManager::kTRD4;
198 break;
199 case 4:
200 iLayer = AliGeomManager::kTRD5;
201 break;
202 case 5:
203 iLayer = AliGeomManager::kTRD6;
204 break;
205 };
053767a4 206 Int_t modId = fGeom->GetSector(idet) * fGeom->Nstack() + fGeom->GetStack(idet);
41702fec 207 UShort_t volid = AliGeomManager::LayerToVolUID(iLayer, modId);
208 p.SetVolumeID(volid);
209
210 return kTRUE;
0906e73e 211}
212
eb38ed55 213//____________________________________________________________________
214TLinearFitter* AliTRDtrackerV1::GetTiltedRiemanFitter()
215{
41702fec 216 if(!fgTiltedRieman) fgTiltedRieman = new TLinearFitter(4, "hyp4");
217 return fgTiltedRieman;
eb38ed55 218}
0906e73e 219
eb38ed55 220//____________________________________________________________________
221TLinearFitter* AliTRDtrackerV1::GetTiltedRiemanFitterConstraint()
222{
41702fec 223 if(!fgTiltedRiemanConstrained) fgTiltedRiemanConstrained = new TLinearFitter(2, "hyp2");
224 return fgTiltedRiemanConstrained;
eb38ed55 225}
41702fec 226
eb38ed55 227//____________________________________________________________________
228AliRieman* AliTRDtrackerV1::GetRiemanFitter()
229{
053767a4 230 if(!fgRieman) fgRieman = new AliRieman(AliTRDtrackingChamber::kNTimeBins * AliTRDgeometry::kNlayer);
41702fec 231 return fgRieman;
eb38ed55 232}
41702fec 233
0906e73e 234//_____________________________________________________________________________
235Int_t AliTRDtrackerV1::PropagateBack(AliESDEvent *event)
236{
41702fec 237 //
238 // Gets seeds from ESD event. The seeds are AliTPCtrack's found and
239 // backpropagated by the TPC tracker. Each seed is first propagated
240 // to the TRD, and then its prolongation is searched in the TRD.
241 // If sufficiently long continuation of the track is found in the TRD
242 // the track is updated, otherwise it's stored as originaly defined
243 // by the TPC tracker.
244 //
245
246 // Calibration monitor
247 AliTRDCalibraFillHisto *calibra = AliTRDCalibraFillHisto::Instance();
248 if (!calibra) AliInfo("Could not get Calibra instance\n");
249
250 Int_t found = 0; // number of tracks found
251 Float_t foundMin = 20.0;
252
d611c74f 253 Float_t *quality = 0x0;
254 Int_t *index = 0x0;
41702fec 255 Int_t nSeed = event->GetNumberOfTracks();
d611c74f 256 if(nSeed){
257 quality = new Float_t[nSeed];
258 index = new Int_t[nSeed];
259 for (Int_t iSeed = 0; iSeed < nSeed; iSeed++) {
260 AliESDtrack *seed = event->GetTrack(iSeed);
261 Double_t covariance[15];
262 seed->GetExternalCovariance(covariance);
263 quality[iSeed] = covariance[0] + covariance[2];
264 }
265 // Sort tracks according to covariance of local Y and Z
b1957d3c 266 TMath::Sort(nSeed, quality, index,kFALSE);
41702fec 267 }
41702fec 268
269 // Backpropagate all seeds
270 Int_t expectedClr;
271 AliTRDtrackV1 track;
272 for (Int_t iSeed = 0; iSeed < nSeed; iSeed++) {
273
274 // Get the seeds in sorted sequence
275 AliESDtrack *seed = event->GetTrack(index[iSeed]);
276
277 // Check the seed status
278 ULong_t status = seed->GetStatus();
279 if ((status & AliESDtrack::kTPCout) == 0) continue;
280 if ((status & AliESDtrack::kTRDout) != 0) continue;
281
282 // Do the back prolongation
283 new(&track) AliTRDtrackV1(*seed);
215f7116 284 track.SetReconstructor(fReconstructor);
285
41702fec 286 //Int_t lbl = seed->GetLabel();
287 //track.SetSeedLabel(lbl);
e4d4864b 288
289 // Make backup and mark entrance in the TRD
76b60503 290 seed->UpdateTrackParams(&track, AliESDtrack::kTRDin);
291 seed->UpdateTrackParams(&track, AliESDtrack::kTRDbackup);
27fbeba8 292 Float_t p4 = track.GetC(track.GetBz());
ae3fbe1f 293 expectedClr = FollowBackProlongation(track);
294
295 if (expectedClr<0) continue; // Back prolongation failed
296
297 if(expectedClr){
d611c74f 298 found++;
41702fec 299 // computes PID for track
300 track.CookPID();
301 // update calibration references using this track
302 if(calibra->GetHisto2d()) calibra->UpdateHistogramsV1(&track);
303 // save calibration object
224f357f 304 if (fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 0 /*&& quality TODO*/){
305 AliTRDtrackV1 *calibTrack = new AliTRDtrackV1(track);
306 calibTrack->SetOwner();
307 seed->AddCalibObject(calibTrack);
308 }
309 //update ESD track
41702fec 310 if ((track.GetNumberOfClusters() > 15) && (track.GetNumberOfClusters() > 0.5*expectedClr)) {
2389e96f 311 seed->UpdateTrackParams(&track, AliESDtrack::kTRDout);
41702fec 312 track.UpdateESDtrack(seed);
41702fec 313 }
314 }
315
27fbeba8 316 if ((TMath::Abs(track.GetC(track.GetBz()) - p4) / TMath::Abs(p4) < 0.2) ||(track.Pt() > 0.8)) {
e3cf3d02 317
41702fec 318 // Make backup for back propagation
41702fec 319 Int_t foundClr = track.GetNumberOfClusters();
320 if (foundClr >= foundMin) {
41702fec 321 track.CookLabel(1. - fgkLabelFraction);
322 if(track.GetBackupTrack()) UseClusters(track.GetBackupTrack());
41702fec 323
324 // Sign only gold tracks
325 if (track.GetChi2() / track.GetNumberOfClusters() < 4) {
76b60503 326 if ((seed->GetKinkIndex(0) == 0) && (track.Pt() < 1.5)){
327 //UseClusters(&track);
328 }
41702fec 329 }
330 Bool_t isGold = kFALSE;
331
332 // Full gold track
333 if (track.GetChi2() / track.GetNumberOfClusters() < 5) {
334 if (track.GetBackupTrack()) seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup);
335
336 isGold = kTRUE;
337 }
338
339 // Almost gold track
340 if ((!isGold) && (track.GetNCross() == 0) && (track.GetChi2() / track.GetNumberOfClusters() < 7)) {
341 //seed->UpdateTrackParams(track, AliESDtrack::kTRDbackup);
342 if (track.GetBackupTrack()) seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup);
343
344 isGold = kTRUE;
345 }
346
347 if ((!isGold) && (track.GetBackupTrack())) {
348 if ((track.GetBackupTrack()->GetNumberOfClusters() > foundMin) && ((track.GetBackupTrack()->GetChi2()/(track.GetBackupTrack()->GetNumberOfClusters()+1)) < 7)) {
349 seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup);
350 isGold = kTRUE;
351 }
352 }
353
354 //if ((track->StatusForTOF() > 0) && (track->GetNCross() == 0) && (Float_t(track->GetNumberOfClusters()) / Float_t(track->GetNExpected()) > 0.4)) {
355 //seed->UpdateTrackParams(track->GetBackupTrack(), AliESDtrack::kTRDbackup);
356 //}
357 }
358 }
359
360 // Propagation to the TOF (I.Belikov)
361 if (track.IsStopped() == kFALSE) {
362 Double_t xtof = 371.0;
363 Double_t xTOF0 = 370.0;
364
27fbeba8 365 Double_t c2 = track.GetSnp() + track.GetC(track.GetBz()) * (xtof - track.GetX());
41702fec 366 if (TMath::Abs(c2) >= 0.99) continue;
367
ae3fbe1f 368 if (!PropagateToX(track, xTOF0, fgkMaxStep)) continue;
41702fec 369
370 // Energy losses taken to the account - check one more time
27fbeba8 371 c2 = track.GetSnp() + track.GetC(track.GetBz()) * (xtof - track.GetX());
41702fec 372 if (TMath::Abs(c2) >= 0.99) continue;
373
374 //if (!PropagateToX(*track,xTOF0,fgkMaxStep)) {
375 // fHBackfit->Fill(7);
376 //delete track;
377 // continue;
378 //}
379
380 Double_t ymax = xtof * TMath::Tan(0.5 * AliTRDgeometry::GetAlpha());
381 Double_t y;
382 track.GetYAt(xtof,GetBz(),y);
383 if (y > ymax) {
384 if (!track.Rotate( AliTRDgeometry::GetAlpha())) continue;
385 }else if (y < -ymax) {
386 if (!track.Rotate(-AliTRDgeometry::GetAlpha())) continue;
387 }
388
389 if (track.PropagateTo(xtof)) {
390 seed->UpdateTrackParams(&track, AliESDtrack::kTRDout);
391 track.UpdateESDtrack(seed);
41702fec 392 }
393 } else {
394 if ((track.GetNumberOfClusters() > 15) && (track.GetNumberOfClusters() > 0.5*expectedClr)) {
395 seed->UpdateTrackParams(&track, AliESDtrack::kTRDout);
396
397 track.UpdateESDtrack(seed);
41702fec 398 }
399 }
400
401 seed->SetTRDQuality(track.StatusForTOF());
402 seed->SetTRDBudget(track.GetBudget(0));
403 }
d611c74f 404 if(index) delete [] index;
405 if(quality) delete [] quality;
41702fec 406
407
408 AliInfo(Form("Number of seeds: %d", nSeed));
409 AliInfo(Form("Number of back propagated TRD tracks: %d", found));
410
d611c74f 411 // run stand alone tracking
3a039a31 412 if (fReconstructor->IsSeeding()) Clusters2Tracks(event);
41702fec 413
414 return 0;
0906e73e 415}
416
417
418//____________________________________________________________________
419Int_t AliTRDtrackerV1::RefitInward(AliESDEvent *event)
420{
41702fec 421 //
422 // Refits tracks within the TRD. The ESD event is expected to contain seeds
423 // at the outer part of the TRD.
424 // The tracks are propagated to the innermost time bin
425 // of the TRD and the ESD event is updated
426 // Origin: Thomas KUHR (Thomas.Kuhr@cern.ch)
427 //
428
429 Int_t nseed = 0; // contor for loaded seeds
430 Int_t found = 0; // contor for updated TRD tracks
431
432
433 AliTRDtrackV1 track;
434 for (Int_t itrack = 0; itrack < event->GetNumberOfTracks(); itrack++) {
435 AliESDtrack *seed = event->GetTrack(itrack);
436 new(&track) AliTRDtrackV1(*seed);
437
438 if (track.GetX() < 270.0) {
439 seed->UpdateTrackParams(&track, AliESDtrack::kTRDbackup);
440 continue;
441 }
442
e3cf3d02 443 // reject tracks which failed propagation in the TRD or
444 // are produced by the TRD stand alone tracker
41702fec 445 ULong_t status = seed->GetStatus();
e3cf3d02 446 if(!(status & AliESDtrack::kTRDout)) continue;
447 if(!(status & AliESDtrack::kTRDin)) continue;
41702fec 448 nseed++;
449
450 track.ResetCovariance(50.0);
451
452 // do the propagation and processing
453 Bool_t kUPDATE = kFALSE;
454 Double_t xTPC = 250.0;
455 if(FollowProlongation(track)){
456 // Prolongate to TPC
457 if (PropagateToX(track, xTPC, fgkMaxStep)) { // -with update
e3cf3d02 458 seed->UpdateTrackParams(&track, AliESDtrack::kTRDrefit);
459 found++;
460 kUPDATE = kTRUE;
461 }
462
463 // Update the friend track
464 if (fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 0){
465 TObject *o = 0x0; Int_t ic = 0;
466 AliTRDtrackV1 *calibTrack = 0x0;
467 while((o = seed->GetCalibObject(ic++))){
468 if(!(calibTrack = dynamic_cast<AliTRDtrackV1*>(o))) continue;
469 calibTrack->SetTrackHigh(track.GetTrackHigh());
470 }
41702fec 471 }
e3cf3d02 472 }
41702fec 473
474 // Prolongate to TPC without update
475 if(!kUPDATE) {
476 AliTRDtrackV1 tt(*seed);
e3cf3d02 477 if (PropagateToX(tt, xTPC, fgkMaxStep)) seed->UpdateTrackParams(&tt, AliESDtrack::kTRDbackup);
41702fec 478 }
479 }
480 AliInfo(Form("Number of loaded seeds: %d",nseed));
481 AliInfo(Form("Number of found tracks from loaded seeds: %d",found));
482
483 return 0;
0906e73e 484}
485
0906e73e 486//____________________________________________________________________
487Int_t AliTRDtrackerV1::FollowProlongation(AliTRDtrackV1 &t)
488{
41702fec 489 // Extrapolates the TRD track in the TPC direction.
490 //
491 // Parameters
492 // t : the TRD track which has to be extrapolated
493 //
494 // Output
495 // number of clusters attached to the track
496 //
497 // Detailed description
498 //
499 // Starting from current radial position of track <t> this function
500 // extrapolates the track through the 6 TRD layers. The following steps
501 // are being performed for each plane:
502 // 1. prepare track:
503 // a. get plane limits in the local x direction
504 // b. check crossing sectors
505 // c. check track inclination
506 // 2. search tracklet in the tracker list (see GetTracklet() for details)
507 // 3. evaluate material budget using the geo manager
508 // 4. propagate and update track using the tracklet information.
509 //
510 // Debug level 2
511 //
512
e3cf3d02 513 Bool_t kStoreIn = kTRUE;
41702fec 514 Int_t nClustersExpected = 0;
e3cf3d02 515 for (Int_t iplane = kNPlanes; iplane--;) {
41702fec 516 Int_t index = 0;
517 AliTRDseedV1 *tracklet = GetTracklet(&t, iplane, index);
518 if(!tracklet) continue;
519 if(!tracklet->IsOK()) AliWarning("tracklet not OK");
520
e3cf3d02 521 Double_t x = tracklet->GetX();//GetX0();
41702fec 522 // reject tracklets which are not considered for inward refit
523 if(x > t.GetX()+fgkMaxStep) continue;
524
525 // append tracklet to track
526 t.SetTracklet(tracklet, index);
527
528 if (x < (t.GetX()-fgkMaxStep) && !PropagateToX(t, x+fgkMaxStep, fgkMaxStep)) break;
529 if (!AdjustSector(&t)) break;
530
531 // Start global position
532 Double_t xyz0[3];
533 t.GetXYZ(xyz0);
534
535 // End global position
536 Double_t alpha = t.GetAlpha(), y, z;
537 if (!t.GetProlongation(x,y,z)) break;
538 Double_t xyz1[3];
539 xyz1[0] = x * TMath::Cos(alpha) - y * TMath::Sin(alpha);
540 xyz1[1] = x * TMath::Sin(alpha) + y * TMath::Cos(alpha);
541 xyz1[2] = z;
542
51a23065 543 Double_t length = TMath::Sqrt(
544 (xyz0[0]-xyz1[0])*(xyz0[0]-xyz1[0]) +
545 (xyz0[1]-xyz1[1])*(xyz0[1]-xyz1[1]) +
546 (xyz0[2]-xyz1[2])*(xyz0[2]-xyz1[2])
547 );
548 if(length>0.){
549 // Get material budget
550 Double_t param[7];
551 if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param)<=0.) break;
552 Double_t xrho= param[0]*param[4];
553 Double_t xx0 = param[1]; // Get mean propagation parameters
554
555 // Propagate and update
556 t.PropagateTo(x, xx0, xrho);
557 if (!AdjustSector(&t)) break;
558 }
e3cf3d02 559 if(kStoreIn){
560 t.SetTrackHigh();
561 kStoreIn = kFALSE;
562 }
563
41702fec 564 Double_t maxChi2 = t.GetPredictedChi2(tracklet);
565 if (maxChi2 < 1e+10 && t.Update(tracklet, maxChi2)){
566 nClustersExpected += tracklet->GetN();
567 }
568 }
569
3a039a31 570 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){
41702fec 571 Int_t index;
51a23065 572 for(int iplane=0; iplane<AliTRDgeometry::kNlayer; iplane++){
41702fec 573 AliTRDseedV1 *tracklet = GetTracklet(&t, iplane, index);
574 if(!tracklet) continue;
575 t.SetTracklet(tracklet, index);
576 }
577
578 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
29f95561 579 TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
41702fec 580 cstreamer << "FollowProlongation"
581 << "EventNumber=" << eventNumber
582 << "ncl=" << nClustersExpected
583 //<< "track.=" << &t
584 << "\n";
585 }
586
587 return nClustersExpected;
0906e73e 588
589}
590
591//_____________________________________________________________________________
592Int_t AliTRDtrackerV1::FollowBackProlongation(AliTRDtrackV1 &t)
593{
41702fec 594 // Extrapolates the TRD track in the TOF direction.
595 //
596 // Parameters
597 // t : the TRD track which has to be extrapolated
598 //
599 // Output
600 // number of clusters attached to the track
601 //
602 // Detailed description
603 //
604 // Starting from current radial position of track <t> this function
605 // extrapolates the track through the 6 TRD layers. The following steps
606 // are being performed for each plane:
607 // 1. prepare track:
608 // a. get plane limits in the local x direction
609 // b. check crossing sectors
610 // c. check track inclination
611 // 2. build tracklet (see AliTRDseed::AttachClusters() for details)
612 // 3. evaluate material budget using the geo manager
613 // 4. propagate and update track using the tracklet information.
614 //
615 // Debug level 2
616 //
617
618 Int_t nClustersExpected = 0;
b1957d3c 619 Double_t clength = .5*AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick();
41702fec 620 AliTRDtrackingChamber *chamber = 0x0;
621
3b57a3f7 622 AliTRDseedV1 tracklet, *ptrTracklet = 0x0;
181d2c97 623 // in case of stand alone tracking we store all the pointers to the tracklets in a temporary array
624 AliTRDseedV1 *tracklets[kNPlanes];
625 memset(tracklets, 0, sizeof(AliTRDseedV1 *) * kNPlanes);
626 for(Int_t ip = 0; ip < kNPlanes; ip++){
627 tracklets[ip] = t.GetTracklet(ip);
628 t.UnsetTracklet(ip);
629 }
e3cf3d02 630 Bool_t kStoreIn = kTRUE;
631
3b57a3f7 632
053767a4 633 // Loop through the TRD layers
e3cf3d02 634 for (Int_t ilayer = 0; ilayer < kNPlanes; ilayer++) {
41702fec 635 // BUILD TRACKLET IF NOT ALREADY BUILT
b1957d3c 636 Double_t x = 0., x0, y, z, alpha;
181d2c97 637 ptrTracklet = tracklets[ilayer];
41702fec 638 if(!ptrTracklet){
053767a4 639 ptrTracklet = new(&tracklet) AliTRDseedV1(ilayer);
43d6ad34 640 ptrTracklet->SetReconstructor(fReconstructor);
41702fec 641 alpha = t.GetAlpha();
053767a4 642 Int_t sector = Int_t(alpha/AliTRDgeometry::GetAlpha() + (alpha>0. ? 0 : AliTRDgeometry::kNsector));
41702fec 643
644 if(!fTrSec[sector].GetNChambers()) continue;
645
053767a4 646 if((x = fTrSec[sector].GetX(ilayer)) < 1.) continue;
41702fec 647
b1957d3c 648 // Propagate closer to the current layer
649 x0 = x - 1.5*clength;
650 if (x0 > (fgkMaxStep + t.GetX()) && !PropagateToX(t, x0-fgkMaxStep, fgkMaxStep)) return -1/*nClustersExpected*/;
651 if (!AdjustSector(&t)) return -1/*nClustersExpected*/;
652 if (TMath::Abs(t.GetSnp()) > fgkMaxSnp) return -1/*nClustersExpected*/;
653
35c24814 654 if (!t.GetProlongation(x, y, z)) return -1/*nClustersExpected*/;
053767a4 655 Int_t stack = fGeom->GetStack(z, ilayer);
41702fec 656 Int_t nCandidates = stack >= 0 ? 1 : 2;
657 z -= stack >= 0 ? 0. : 4.;
658
659 for(int icham=0; icham<nCandidates; icham++, z+=8){
053767a4 660 if((stack = fGeom->GetStack(z, ilayer)) < 0) continue;
41702fec 661
053767a4 662 if(!(chamber = fTrSec[sector].GetChamber(stack, ilayer))) continue;
41702fec 663
3a039a31 664 if(chamber->GetNClusters() < fgNTimeBins*fReconstructor->GetRecoParam() ->GetFindableClusters()) continue;
41702fec 665
666 x = chamber->GetX();
667
053767a4 668 AliTRDpadPlane *pp = fGeom->GetPadPlane(ilayer, stack);
aec26713 669 tracklet.SetTilt(TMath::Tan(TMath::DegToRad()*pp->GetTiltingAngle()));
41702fec 670 tracklet.SetPadLength(pp->GetLengthIPad());
ae4e8b84 671 tracklet.SetDetector(chamber->GetDetector());
41702fec 672 tracklet.SetX0(x);
b1957d3c 673 tracklet.UpDate(&t);
674// if(!tracklet.Init(&t)){
675// t.SetStopped(kTRUE);
676// return nClustersExpected;
677// }
678 if(!tracklet.AttachClusters(chamber, kTRUE)) continue;
679 //if(!tracklet.AttachClustersIter(chamber, 1000.)) continue;
680 //tracklet.Init(&t);
41702fec 681
3a039a31 682 if(tracklet.GetN() < fgNTimeBins*fReconstructor->GetRecoParam() ->GetFindableClusters()) continue;
41702fec 683
684 break;
685 }
76b60503 686 //ptrTracklet->UseClusters();
b1957d3c 687 }// else ptrTracklet->Init(&t);
41702fec 688 if(!ptrTracklet->IsOK()){
689 if(x < 1.) continue; //temporary
35c24814 690 if(!PropagateToX(t, x-fgkMaxStep, fgkMaxStep)) return -1/*nClustersExpected*/;
691 if(!AdjustSector(&t)) return -1/*nClustersExpected*/;
692 if(TMath::Abs(t.GetSnp()) > fgkMaxSnp) return -1/*nClustersExpected*/;
41702fec 693 continue;
694 }
695
696 // Propagate closer to the current chamber if neccessary
697 x -= clength;
35c24814 698 if (x > (fgkMaxStep + t.GetX()) && !PropagateToX(t, x-fgkMaxStep, fgkMaxStep)) return -1/*nClustersExpected*/;
699 if (!AdjustSector(&t)) return -1/*nClustersExpected*/;
700 if (TMath::Abs(t.GetSnp()) > fgkMaxSnp) return -1/*nClustersExpected*/;
41702fec 701
702 // load tracklet to the tracker and the track
b1957d3c 703 ptrTracklet->Fit(kFALSE); // no tilt correction
41702fec 704 ptrTracklet = SetTracklet(ptrTracklet);
705 t.SetTracklet(ptrTracklet, fTracklets->GetEntriesFast()-1);
706
707
708 // Calculate the mean material budget along the path inside the chamber
709 //Calculate global entry and exit positions of the track in chamber (only track prolongation)
710 Double_t xyz0[3]; // entry point
711 t.GetXYZ(xyz0);
712 alpha = t.GetAlpha();
e3cf3d02 713 x = ptrTracklet->GetX(); //GetX0();
35c24814 714 if (!t.GetProlongation(x, y, z)) return -1/*nClustersExpected*/;
41702fec 715 Double_t xyz1[3]; // exit point
716 xyz1[0] = x * TMath::Cos(alpha) - y * TMath::Sin(alpha);
717 xyz1[1] = +x * TMath::Sin(alpha) + y * TMath::Cos(alpha);
718 xyz1[2] = z;
719 Double_t param[7];
83dea92e 720 if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param)<=0.) return -1;
41702fec 721 // The mean propagation parameters
722 Double_t xrho = param[0]*param[4]; // density*length
723 Double_t xx0 = param[1]; // radiation length
724
725 // Propagate and update track
35c24814 726 if (!t.PropagateTo(x, xx0, xrho)) return -1/*nClustersExpected*/;
727 if (!AdjustSector(&t)) return -1/*nClustersExpected*/;
e3cf3d02 728
729 if(kStoreIn){
730 t.SetTrackLow();
731 kStoreIn = kFALSE;
732 }
41702fec 733 Double_t maxChi2 = t.GetPredictedChi2(ptrTracklet);
35c24814 734 if (!t.Update(ptrTracklet, maxChi2)) return -1/*nClustersExpected*/;
b1957d3c 735 ptrTracklet->UpDate(&t);
736
ae3fbe1f 737 if (maxChi2<1e+10) {
41702fec 738 nClustersExpected += ptrTracklet->GetN();
739 //t.SetTracklet(&tracklet, index);
740 }
741 // Reset material budget if 2 consecutive gold
053767a4 742 if(ilayer>0 && t.GetTracklet(ilayer-1) && ptrTracklet->GetN() + t.GetTracklet(ilayer-1)->GetN() > 20) t.SetBudget(2, 0.);
41702fec 743
744 // Make backup of the track until is gold
745 // TO DO update quality check of the track.
746 // consider comparison with fTimeBinsRange
747 Float_t ratio0 = ptrTracklet->GetN() / Float_t(fgNTimeBins);
748 //Float_t ratio1 = Float_t(t.GetNumberOfClusters()+1) / Float_t(t.GetNExpected()+1);
749 //printf("tracklet.GetChi2() %f [< 18.0]\n", tracklet.GetChi2());
750 //printf("ratio0 %f [> 0.8]\n", ratio0);
751 //printf("ratio1 %f [> 0.6]\n", ratio1);
752 //printf("ratio0+ratio1 %f [> 1.5]\n", ratio0+ratio1);
753 //printf("t.GetNCross() %d [== 0]\n", t.GetNCross());
754 //printf("TMath::Abs(t.GetSnp()) %f [< 0.85]\n", TMath::Abs(t.GetSnp()));
755 //printf("t.GetNumberOfClusters() %d [> 20]\n", t.GetNumberOfClusters());
756
757 if (//(tracklet.GetChi2() < 18.0) && TO DO check with FindClusters and move it to AliTRDseed::Update
758 (ratio0 > 0.8) &&
759 //(ratio1 > 0.6) &&
760 //(ratio0+ratio1 > 1.5) &&
761 (t.GetNCross() == 0) &&
762 (TMath::Abs(t.GetSnp()) < 0.85) &&
e3cf3d02 763 (t.GetNumberOfClusters() > 20)){
764 t.MakeBackupTrack();
765 }
053767a4 766 } // end layers loop
41702fec 767
3a039a31 768 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){
29f95561 769 TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
41702fec 770 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
771 //AliTRDtrackV1 *debugTrack = new AliTRDtrackV1(t);
772 //debugTrack->SetOwner();
773 cstreamer << "FollowBackProlongation"
774 << "EventNumber=" << eventNumber
775 << "ncl=" << nClustersExpected
776 //<< "track.=" << debugTrack
777 << "\n";
778 }
779
780 return nClustersExpected;
0906e73e 781}
782
eb38ed55 783//_________________________________________________________________________
784Float_t AliTRDtrackerV1::FitRieman(AliTRDseedV1 *tracklets, Double_t *chi2, Int_t *planes){
41702fec 785 //
786 // Fits a Riemann-circle to the given points without tilting pad correction.
787 // The fit is performed using an instance of the class AliRieman (equations
788 // and transformations see documentation of this class)
789 // Afterwards all the tracklets are Updated
790 //
791 // Parameters: - Array of tracklets (AliTRDseedV1)
792 // - Storage for the chi2 values (beginning with direction z)
793 // - Seeding configuration
794 // Output: - The curvature
795 //
796 AliRieman *fitter = AliTRDtrackerV1::GetRiemanFitter();
797 fitter->Reset();
798 Int_t allplanes[] = {0, 1, 2, 3, 4, 5};
799 Int_t *ppl = &allplanes[0];
800 Int_t maxLayers = 6;
801 if(planes){
802 maxLayers = 4;
803 ppl = planes;
804 }
805 for(Int_t il = 0; il < maxLayers; il++){
806 if(!tracklets[ppl[il]].IsOK()) continue;
e3cf3d02 807 fitter->AddPoint(tracklets[ppl[il]].GetX0(), tracklets[ppl[il]].GetYfit(0), tracklets[ppl[il]].GetZfit(0),1,10);
41702fec 808 }
809 fitter->Update();
810 // Set the reference position of the fit and calculate the chi2 values
811 memset(chi2, 0, sizeof(Double_t) * 2);
812 for(Int_t il = 0; il < maxLayers; il++){
813 // Reference positions
814 tracklets[ppl[il]].Init(fitter);
815
816 // chi2
817 if((!tracklets[ppl[il]].IsOK()) && (!planes)) continue;
818 chi2[0] += tracklets[ppl[il]].GetChi2Y();
819 chi2[1] += tracklets[ppl[il]].GetChi2Z();
820 }
821 return fitter->GetC();
eb38ed55 822}
823
824//_________________________________________________________________________
825void AliTRDtrackerV1::FitRieman(AliTRDcluster **seedcl, Double_t chi2[2])
826{
41702fec 827 //
828 // Performs a Riemann helix fit using the seedclusters as spacepoints
829 // Afterwards the chi2 values are calculated and the seeds are updated
830 //
831 // Parameters: - The four seedclusters
832 // - The tracklet array (AliTRDseedV1)
833 // - The seeding configuration
834 // - Chi2 array
835 //
836 // debug level 2
837 //
838 AliRieman *fitter = AliTRDtrackerV1::GetRiemanFitter();
839 fitter->Reset();
840 for(Int_t i = 0; i < 4; i++)
841 fitter->AddPoint(seedcl[i]->GetX(), seedcl[i]->GetY(), seedcl[i]->GetZ(), 1, 10);
842 fitter->Update();
843
844
845 // Update the seed and calculated the chi2 value
846 chi2[0] = 0; chi2[1] = 0;
847 for(Int_t ipl = 0; ipl < kNSeedPlanes; ipl++){
848 // chi2
849 chi2[0] += (seedcl[ipl]->GetZ() - fitter->GetZat(seedcl[ipl]->GetX())) * (seedcl[ipl]->GetZ() - fitter->GetZat(seedcl[ipl]->GetX()));
850 chi2[1] += (seedcl[ipl]->GetY() - fitter->GetYat(seedcl[ipl]->GetX())) * (seedcl[ipl]->GetY() - fitter->GetYat(seedcl[ipl]->GetX()));
851 }
eb38ed55 852}
853
854
855//_________________________________________________________________________
856Float_t AliTRDtrackerV1::FitTiltedRiemanConstraint(AliTRDseedV1 *tracklets, Double_t zVertex)
857{
41702fec 858 //
859 // Fits a helix to the clusters. Pad tilting is considered. As constraint it is
860 // assumed that the vertex position is set to 0.
861 // This method is very usefull for high-pt particles
862 // Basis for the fit: (x - x0)^2 + (y - y0)^2 - R^2 = 0
863 // x0, y0: Center of the circle
864 // Measured y-position: ymeas = y - tan(phiT)(zc - zt)
865 // zc: center of the pad row
866 // Equation which has to be fitted (after transformation):
867 // a + b * u + e * v + 2*(ymeas + tan(phiT)(z - zVertex))*t = 0
868 // Transformation:
869 // t = 1/(x^2 + y^2)
870 // u = 2 * x * t
871 // v = 2 * x * tan(phiT) * t
872 // Parameters in the equation:
873 // a = -1/y0, b = x0/y0, e = dz/dx
874 //
875 // The Curvature is calculated by the following equation:
876 // - curv = a/Sqrt(b^2 + 1) = 1/R
877 // Parameters: - the 6 tracklets
878 // - the Vertex constraint
879 // Output: - the Chi2 value of the track
880 //
881 // debug level 5
882 //
883
884 TLinearFitter *fitter = GetTiltedRiemanFitterConstraint();
885 fitter->StoreData(kTRUE);
886 fitter->ClearPoints();
887 AliTRDcluster *cl = 0x0;
888
889 Float_t x, y, z, w, t, error, tilt;
890 Double_t uvt[2];
891 Int_t nPoints = 0;
053767a4 892 for(Int_t ilr = 0; ilr < AliTRDgeometry::kNlayer; ilr++){
893 if(!tracklets[ilr].IsOK()) continue;
41702fec 894 for(Int_t itb = 0; itb < fgNTimeBins; itb++){
053767a4 895 if(!tracklets[ilr].IsUsable(itb)) continue;
896 cl = tracklets[ilr].GetClusters(itb);
41702fec 897 x = cl->GetX();
898 y = cl->GetY();
899 z = cl->GetZ();
053767a4 900 tilt = tracklets[ilr].GetTilt();
41702fec 901 // Transformation
902 t = 1./(x * x + y * y);
903 uvt[0] = 2. * x * t;
904 uvt[1] = 2. * x * t * tilt ;
905 w = 2. * (y + tilt * (z - zVertex)) * t;
906 error = 2. * 0.2 * t;
907 fitter->AddPoint(uvt, w, error);
908 nPoints++;
909 }
910 }
911 fitter->Eval();
912
913 // Calculate curvature
914 Double_t a = fitter->GetParameter(0);
915 Double_t b = fitter->GetParameter(1);
916 Double_t curvature = a/TMath::Sqrt(b*b + 1);
917
918 Float_t chi2track = fitter->GetChisquare()/Double_t(nPoints);
919 for(Int_t ip = 0; ip < AliTRDtrackerV1::kNPlanes; ip++)
e3cf3d02 920 tracklets[ip].SetC(curvature);
41702fec 921
3a039a31 922/* if(fReconstructor->GetStreamLevel() >= 5){
41702fec 923 //Linear Model on z-direction
924 Double_t xref = CalculateReferenceX(tracklets); // Relative to the middle of the stack
925 Double_t slope = fitter->GetParameter(2);
926 Double_t zref = slope * xref;
927 Float_t chi2Z = CalculateChi2Z(tracklets, zref, slope, xref);
928 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
929 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
29f95561 930 TTreeSRedirector &treeStreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
41702fec 931 treeStreamer << "FitTiltedRiemanConstraint"
932 << "EventNumber=" << eventNumber
933 << "CandidateNumber=" << candidateNumber
934 << "Curvature=" << curvature
935 << "Chi2Track=" << chi2track
936 << "Chi2Z=" << chi2Z
937 << "zref=" << zref
938 << "\n";
3a039a31 939 }*/
41702fec 940 return chi2track;
eb38ed55 941}
942
943//_________________________________________________________________________
944Float_t AliTRDtrackerV1::FitTiltedRieman(AliTRDseedV1 *tracklets, Bool_t sigError)
945{
41702fec 946 //
947 // Performs a Riemann fit taking tilting pad correction into account
948 // The equation of a Riemann circle, where the y position is substituted by the
949 // measured y-position taking pad tilting into account, has to be transformed
950 // into a 4-dimensional hyperplane equation
951 // Riemann circle: (x-x0)^2 + (y-y0)^2 -R^2 = 0
952 // Measured y-Position: ymeas = y - tan(phiT)(zc - zt)
953 // zc: center of the pad row
954 // zt: z-position of the track
955 // The z-position of the track is assumed to be linear dependent on the x-position
956 // Transformed equation: a + b * u + c * t + d * v + e * w - 2 * (ymeas + tan(phiT) * zc) * t = 0
957 // Transformation: u = 2 * x * t
958 // v = 2 * tan(phiT) * t
959 // w = 2 * tan(phiT) * (x - xref) * t
960 // t = 1 / (x^2 + ymeas^2)
961 // Parameters: a = -1/y0
962 // b = x0/y0
963 // c = (R^2 -x0^2 - y0^2)/y0
964 // d = offset
965 // e = dz/dx
966 // If the offset respectively the slope in z-position is impossible, the parameters are fixed using
967 // results from the simple riemann fit. Afterwards the fit is redone.
968 // The curvature is calculated according to the formula:
969 // curv = a/(1 + b^2 + c*a) = 1/R
970 //
971 // Paramters: - Array of tracklets (connected to the track candidate)
972 // - Flag selecting the error definition
973 // Output: - Chi2 values of the track (in Parameter list)
974 //
975 TLinearFitter *fitter = GetTiltedRiemanFitter();
976 fitter->StoreData(kTRUE);
977 fitter->ClearPoints();
978 AliTRDLeastSquare zfitter;
979 AliTRDcluster *cl = 0x0;
980
981 Double_t xref = CalculateReferenceX(tracklets);
982 Double_t x, y, z, t, tilt, dx, w, we;
983 Double_t uvt[4];
984 Int_t nPoints = 0;
985 // Containers for Least-square fitter
986 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
987 if(!tracklets[ipl].IsOK()) continue;
988 for(Int_t itb = 0; itb < fgNTimeBins; itb++){
989 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
990 if (!tracklets[ipl].IsUsable(itb)) continue;
991 x = cl->GetX();
992 y = cl->GetY();
993 z = cl->GetZ();
994 tilt = tracklets[ipl].GetTilt();
995 dx = x - xref;
996 // Transformation
997 t = 1./(x*x + y*y);
998 uvt[0] = 2. * x * t;
999 uvt[1] = t;
1000 uvt[2] = 2. * tilt * t;
1001 uvt[3] = 2. * tilt * dx * t;
1002 w = 2. * (y + tilt*z) * t;
1003 // error definition changes for the different calls
1004 we = 2. * t;
1005 we *= sigError ? tracklets[ipl].GetSigmaY() : 0.2;
1006 fitter->AddPoint(uvt, w, we);
1007 zfitter.AddPoint(&x, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
1008 nPoints++;
1009 }
1010 }
1011 fitter->Eval();
1012 zfitter.Eval();
1013
1014 Double_t offset = fitter->GetParameter(3);
1015 Double_t slope = fitter->GetParameter(4);
1016
1017 // Linear fitter - not possible to make boundaries
1018 // Do not accept non possible z and dzdx combinations
1019 Bool_t acceptablez = kTRUE;
1020 Double_t zref = 0.0;
1021 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
1022 if(!tracklets[iLayer].IsOK()) continue;
1023 zref = offset + slope * (tracklets[iLayer].GetX0() - xref);
e3cf3d02 1024 if (TMath::Abs(tracklets[iLayer].GetZfit(0) - zref) > tracklets[iLayer].GetPadLength() * 0.5 + 1.0)
41702fec 1025 acceptablez = kFALSE;
1026 }
1027 if (!acceptablez) {
1028 Double_t dzmf = zfitter.GetFunctionParameter(1);
1029 Double_t zmf = zfitter.GetFunctionValue(&xref);
1030 fgTiltedRieman->FixParameter(3, zmf);
1031 fgTiltedRieman->FixParameter(4, dzmf);
1032 fitter->Eval();
1033 fitter->ReleaseParameter(3);
1034 fitter->ReleaseParameter(4);
1035 offset = fitter->GetParameter(3);
1036 slope = fitter->GetParameter(4);
1037 }
1038
1039 // Calculate Curvarture
1040 Double_t a = fitter->GetParameter(0);
1041 Double_t b = fitter->GetParameter(1);
1042 Double_t c = fitter->GetParameter(2);
1043 Double_t curvature = 1.0 + b*b - c*a;
1044 if (curvature > 0.0)
1045 curvature = a / TMath::Sqrt(curvature);
1046
1047 Double_t chi2track = fitter->GetChisquare()/Double_t(nPoints);
1048
1049 // Update the tracklets
1050 Double_t dy, dz;
1051 for(Int_t iLayer = 0; iLayer < AliTRDtrackerV1::kNPlanes; iLayer++) {
1052
1053 x = tracklets[iLayer].GetX0();
1054 y = 0;
1055 z = 0;
1056 dy = 0;
1057 dz = 0;
1058
1059 // y: R^2 = (x - x0)^2 + (y - y0)^2
1060 // => y = y0 +/- Sqrt(R^2 - (x - x0)^2)
1061 // R = Sqrt() = 1/Curvature
1062 // => y = y0 +/- Sqrt(1/Curvature^2 - (x - x0)^2)
1063 Double_t res = (x * a + b); // = (x - x0)/y0
1064 res *= res;
1065 res = 1.0 - c * a + b * b - res; // = (R^2 - (x - x0)^2)/y0^2
1066 if (res >= 0) {
1067 res = TMath::Sqrt(res);
1068 y = (1.0 - res) / a;
1069 }
1070
1071 // dy: R^2 = (x - x0)^2 + (y - y0)^2
1072 // => y = +/- Sqrt(R^2 - (x - x0)^2) + y0
1073 // => dy/dx = (x - x0)/Sqrt(R^2 - (x - x0)^2)
1074 // Curvature: cr = 1/R = a/Sqrt(1 + b^2 - c*a)
1075 // => dy/dx = (x - x0)/(1/(cr^2) - (x - x0)^2)
1076 Double_t x0 = -b / a;
1077 if (-c * a + b * b + 1 > 0) {
1078 if (1.0/(curvature * curvature) - (x - x0) * (x - x0) > 0.0) {
1079 Double_t yderiv = (x - x0) / TMath::Sqrt(1.0/(curvature * curvature) - (x - x0) * (x - x0));
1080 if (a < 0) yderiv *= -1.0;
1081 dy = yderiv;
1082 }
1083 }
1084 z = offset + slope * (x - xref);
1085 dz = slope;
1086 tracklets[iLayer].SetYref(0, y);
1087 tracklets[iLayer].SetYref(1, dy);
1088 tracklets[iLayer].SetZref(0, z);
1089 tracklets[iLayer].SetZref(1, dz);
1090 tracklets[iLayer].SetC(curvature);
1091 tracklets[iLayer].SetChi2(chi2track);
1092 }
1093
3a039a31 1094/* if(fReconstructor->GetStreamLevel() >=5){
29f95561 1095 TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
41702fec 1096 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
1097 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
1098 Double_t chi2z = CalculateChi2Z(tracklets, offset, slope, xref);
1099 cstreamer << "FitTiltedRieman0"
1100 << "EventNumber=" << eventNumber
1101 << "CandidateNumber=" << candidateNumber
1102 << "xref=" << xref
1103 << "Chi2Z=" << chi2z
1104 << "\n";
3a039a31 1105 }*/
41702fec 1106 return chi2track;
eb38ed55 1107}
1108
3b57a3f7 1109
9e333711 1110//____________________________________________________________________
6e4d4425 1111Double_t AliTRDtrackerV1::FitLine(const AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t err, Int_t np, AliTrackPoint *points)
9e333711 1112{
1113 AliTRDLeastSquare yfitter, zfitter;
1114 AliTRDcluster *cl = 0x0;
1115
1116 AliTRDseedV1 work[kNPlanes], *tracklet = 0x0;
1117 if(!tracklets){
1118 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1119 if(!(tracklet = track->GetTracklet(ipl))) continue;
1120 if(!tracklet->IsOK()) continue;
1121 new(&work[ipl]) AliTRDseedV1(*tracklet);
1122 }
1123 tracklets = &work[0];
1124 }
1125
1126 Double_t xref = CalculateReferenceX(tracklets);
1127 Double_t x, y, z, dx, ye, yr, tilt;
1128 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1129 if(!tracklets[ipl].IsOK()) continue;
1130 for(Int_t itb = 0; itb < fgNTimeBins; itb++){
1131 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1132 if (!tracklets[ipl].IsUsable(itb)) continue;
1133 x = cl->GetX();
1134 z = cl->GetZ();
1135 dx = x - xref;
1136 zfitter.AddPoint(&dx, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
1137 }
1138 }
1139 zfitter.Eval();
1140 Double_t z0 = zfitter.GetFunctionParameter(0);
1141 Double_t dzdx = zfitter.GetFunctionParameter(1);
1142 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1143 if(!tracklets[ipl].IsOK()) continue;
1144 for(Int_t itb = 0; itb < fgNTimeBins; itb++){
1145 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1146 if (!tracklets[ipl].IsUsable(itb)) continue;
1147 x = cl->GetX();
1148 y = cl->GetY();
1149 z = cl->GetZ();
1150 tilt = tracklets[ipl].GetTilt();
1151 dx = x - xref;
1152 yr = y + tilt*(z - z0 - dzdx*dx);
1153 // error definition changes for the different calls
1154 ye = tilt*TMath::Sqrt(cl->GetSigmaZ2());
1155 ye += err ? tracklets[ipl].GetSigmaY() : 0.2;
1156 yfitter.AddPoint(&dx, yr, ye);
1157 }
1158 }
1159 yfitter.Eval();
1160 Double_t y0 = yfitter.GetFunctionParameter(0);
1161 Double_t dydx = yfitter.GetFunctionParameter(1);
1162 Double_t chi2 = 0.;//yfitter.GetChisquare()/Double_t(nPoints);
1163
1164 //update track points array
1165 if(np && points){
1166 Float_t xyz[3];
1167 for(int ip=0; ip<np; ip++){
1168 points[ip].GetXYZ(xyz);
1169 xyz[1] = y0 + dydx * (xyz[0] - xref);
1170 xyz[2] = z0 + dzdx * (xyz[0] - xref);
1171 points[ip].SetXYZ(xyz);
1172 }
1173 }
1174 return chi2;
1175}
1176
1177
3b57a3f7 1178//_________________________________________________________________________
6e4d4425 1179Double_t AliTRDtrackerV1::FitRiemanTilt(const AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t sigError, Int_t np, AliTrackPoint *points)
3b57a3f7 1180{
41702fec 1181 //
1182 // Performs a Riemann fit taking tilting pad correction into account
1183 // The equation of a Riemann circle, where the y position is substituted by the
1184 // measured y-position taking pad tilting into account, has to be transformed
1185 // into a 4-dimensional hyperplane equation
1186 // Riemann circle: (x-x0)^2 + (y-y0)^2 -R^2 = 0
1187 // Measured y-Position: ymeas = y - tan(phiT)(zc - zt)
1188 // zc: center of the pad row
1189 // zt: z-position of the track
1190 // The z-position of the track is assumed to be linear dependent on the x-position
1191 // Transformed equation: a + b * u + c * t + d * v + e * w - 2 * (ymeas + tan(phiT) * zc) * t = 0
1192 // Transformation: u = 2 * x * t
1193 // v = 2 * tan(phiT) * t
1194 // w = 2 * tan(phiT) * (x - xref) * t
1195 // t = 1 / (x^2 + ymeas^2)
1196 // Parameters: a = -1/y0
1197 // b = x0/y0
1198 // c = (R^2 -x0^2 - y0^2)/y0
1199 // d = offset
1200 // e = dz/dx
1201 // If the offset respectively the slope in z-position is impossible, the parameters are fixed using
1202 // results from the simple riemann fit. Afterwards the fit is redone.
1203 // The curvature is calculated according to the formula:
1204 // curv = a/(1 + b^2 + c*a) = 1/R
1205 //
1206 // Paramters: - Array of tracklets (connected to the track candidate)
1207 // - Flag selecting the error definition
1208 // Output: - Chi2 values of the track (in Parameter list)
1209 //
1210 TLinearFitter *fitter = GetTiltedRiemanFitter();
1211 fitter->StoreData(kTRUE);
1212 fitter->ClearPoints();
1213 AliTRDLeastSquare zfitter;
1214 AliTRDcluster *cl = 0x0;
3b57a3f7 1215
1216 AliTRDseedV1 work[kNPlanes], *tracklet = 0x0;
1217 if(!tracklets){
1218 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1219 if(!(tracklet = track->GetTracklet(ipl))) continue;
1220 if(!tracklet->IsOK()) continue;
1221 new(&work[ipl]) AliTRDseedV1(*tracklet);
1222 }
1223 tracklets = &work[0];
1224 }
1225
41702fec 1226 Double_t xref = CalculateReferenceX(tracklets);
1227 Double_t x, y, z, t, tilt, dx, w, we;
1228 Double_t uvt[4];
1229 Int_t nPoints = 0;
1230 // Containers for Least-square fitter
1231 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1232 if(!tracklets[ipl].IsOK()) continue;
1233 for(Int_t itb = 0; itb < fgNTimeBins; itb++){
1234 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1235 if (!tracklets[ipl].IsUsable(itb)) continue;
1236 x = cl->GetX();
1237 y = cl->GetY();
1238 z = cl->GetZ();
1239 tilt = tracklets[ipl].GetTilt();
1240 dx = x - xref;
1241 // Transformation
1242 t = 1./(x*x + y*y);
1243 uvt[0] = 2. * x * t;
1244 uvt[1] = t;
1245 uvt[2] = 2. * tilt * t;
1246 uvt[3] = 2. * tilt * dx * t;
1247 w = 2. * (y + tilt*z) * t;
1248 // error definition changes for the different calls
1249 we = 2. * t;
1250 we *= sigError ? tracklets[ipl].GetSigmaY() : 0.2;
1251 fitter->AddPoint(uvt, w, we);
1252 zfitter.AddPoint(&x, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
1253 nPoints++;
1254 }
1255 }
aec26713 1256 if(fitter->Eval()) return 1.E10;
1257
41702fec 1258 Double_t z0 = fitter->GetParameter(3);
1259 Double_t dzdx = fitter->GetParameter(4);
3b57a3f7 1260
1261
1262 // Linear fitter - not possible to make boundaries
1263 // Do not accept non possible z and dzdx combinations
1264 Bool_t accept = kTRUE;
1265 Double_t zref = 0.0;
1266 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
1267 if(!tracklets[iLayer].IsOK()) continue;
1268 zref = z0 + dzdx * (tracklets[iLayer].GetX0() - xref);
e3cf3d02 1269 if (TMath::Abs(tracklets[iLayer].GetZfit(0) - zref) > tracklets[iLayer].GetPadLength() * 0.5 + 1.0)
3b57a3f7 1270 accept = kFALSE;
1271 }
1272 if (!accept) {
41702fec 1273 zfitter.Eval();
3b57a3f7 1274 Double_t dzmf = zfitter.GetFunctionParameter(1);
1275 Double_t zmf = zfitter.GetFunctionValue(&xref);
1276 fitter->FixParameter(3, zmf);
1277 fitter->FixParameter(4, dzmf);
1278 fitter->Eval();
1279 fitter->ReleaseParameter(3);
1280 fitter->ReleaseParameter(4);
1281 z0 = fitter->GetParameter(3); // = zmf ?
1282 dzdx = fitter->GetParameter(4); // = dzmf ?
1283 }
1284
1285 // Calculate Curvature
1286 Double_t a = fitter->GetParameter(0);
1287 Double_t b = fitter->GetParameter(1);
1288 Double_t c = fitter->GetParameter(2);
1289 Double_t y0 = 1. / a;
1290 Double_t x0 = -b * y0;
a015e406 1291 Double_t tmp = y0*y0 + x0*x0 - c*y0;
1292 if(tmp<=0.) return 1.E10;
1293 Double_t R = TMath::Sqrt(tmp);
3b57a3f7 1294 Double_t C = 1.0 + b*b - c*a;
1295 if (C > 0.0) C = a / TMath::Sqrt(C);
1296
1297 // Calculate chi2 of the fit
1298 Double_t chi2 = fitter->GetChisquare()/Double_t(nPoints);
1299
1300 // Update the tracklets
1301 if(!track){
1302 for(Int_t ip = 0; ip < kNPlanes; ip++) {
1303 x = tracklets[ip].GetX0();
90cf7133 1304 tmp = R*R-(x-x0)*(x-x0);
a015e406 1305 if(tmp <= 0.) continue;
1306 tmp = TMath::Sqrt(tmp);
3b57a3f7 1307
1308 // y: R^2 = (x - x0)^2 + (y - y0)^2
1309 // => y = y0 +/- Sqrt(R^2 - (x - x0)^2)
1310 tracklets[ip].SetYref(0, y0 - (y0>0.?1.:-1)*tmp);
1311 // => dy/dx = (x - x0)/Sqrt(R^2 - (x - x0)^2)
1312 tracklets[ip].SetYref(1, (x - x0) / tmp);
1313 tracklets[ip].SetZref(0, z0 + dzdx * (x - xref));
1314 tracklets[ip].SetZref(1, dzdx);
1315 tracklets[ip].SetC(C);
1316 tracklets[ip].SetChi2(chi2);
1317 }
1318 }
3b57a3f7 1319 //update track points array
1320 if(np && points){
1321 Float_t xyz[3];
1322 for(int ip=0; ip<np; ip++){
1323 points[ip].GetXYZ(xyz);
60e55aee 1324 xyz[1] = TMath::Abs(xyz[0] - x0) > R ? 100. : y0 - (y0>0.?1.:-1.)*TMath::Sqrt((R-(xyz[0]-x0))*(R+(xyz[0]-x0)));
3b57a3f7 1325 xyz[2] = z0 + dzdx * (xyz[0] - xref);
1326 points[ip].SetXYZ(xyz);
1327 }
1328 }
1329
3b57a3f7 1330 return chi2;
1331}
1332
1333
1bf51039 1334//____________________________________________________________________
1335Double_t AliTRDtrackerV1::FitKalman(AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t up, Int_t np, AliTrackPoint *points)
1336{
1337// Kalman filter implementation for the TRD.
1338// It returns the positions of the fit in the array "points"
1339//
1340// Author : A.Bercuci@gsi.de
1341
3cfaffa4 1342 // printf("Start track @ x[%f]\n", track->GetX());
1bf51039 1343
1344 //prepare marker points along the track
1345 Int_t ip = np ? 0 : 1;
1346 while(ip<np){
1347 if((up?-1:1) * (track->GetX() - points[ip].GetX()) > 0.) break;
1348 //printf("AliTRDtrackerV1::FitKalman() : Skip track marker x[%d] = %7.3f. Before track start ( %7.3f ).\n", ip, points[ip].GetX(), track->GetX());
1349 ip++;
1350 }
1351 //if(points) printf("First marker point @ x[%d] = %f\n", ip, points[ip].GetX());
1352
1353
1354 AliTRDseedV1 tracklet, *ptrTracklet = 0x0;
1355
1356 //Loop through the TRD planes
1357 for (Int_t jplane = 0; jplane < kNPlanes; jplane++) {
1358 // GET TRACKLET OR BUILT IT
1359 Int_t iplane = up ? jplane : kNPlanes - 1 - jplane;
1360 if(tracklets){
1361 if(!(ptrTracklet = &tracklets[iplane])) continue;
1362 }else{
1363 if(!(ptrTracklet = track->GetTracklet(iplane))){
1364 /*AliTRDtrackerV1 *tracker = 0x0;
1365 if(!(tracker = dynamic_cast<AliTRDtrackerV1*>( AliTRDReconstructor::Tracker()))) continue;
1366 ptrTracklet = new(&tracklet) AliTRDseedV1(iplane);
1367 if(!tracker->MakeTracklet(ptrTracklet, track)) */
1368 continue;
1369 }
1370 }
1371 if(!ptrTracklet->IsOK()) continue;
1372
1373 Double_t x = ptrTracklet->GetX0();
1374
1375 while(ip < np){
1376 //don't do anything if next marker is after next update point.
1377 if((up?-1:1) * (points[ip].GetX() - x) - fgkMaxStep < 0) break;
1bf51039 1378 if(((up?-1:1) * (points[ip].GetX() - track->GetX()) < 0) && !PropagateToX(*track, points[ip].GetX(), fgkMaxStep)) return -1.;
1379
1380 Double_t xyz[3]; // should also get the covariance
3cfaffa4 1381 track->GetXYZ(xyz);
1382 track->Global2LocalPosition(xyz, track->GetAlpha());
1383 points[ip].SetXYZ(xyz[0], xyz[1], xyz[2]);
1bf51039 1384 ip++;
1385 }
3cfaffa4 1386 // printf("plane[%d] tracklet[%p] x[%f]\n", iplane, ptrTracklet, x);
1bf51039 1387
3cfaffa4 1388 // Propagate closer to the next update point
1bf51039 1389 if(((up?-1:1) * (x - track->GetX()) + fgkMaxStep < 0) && !PropagateToX(*track, x + (up?-1:1)*fgkMaxStep, fgkMaxStep)) return -1.;
1390
1391 if(!AdjustSector(track)) return -1;
1392 if(TMath::Abs(track->GetSnp()) > fgkMaxSnp) return -1;
1393
1394 //load tracklet to the tracker and the track
1395/* Int_t index;
1396 if((index = FindTracklet(ptrTracklet)) < 0){
1397 ptrTracklet = SetTracklet(&tracklet);
1398 index = fTracklets->GetEntriesFast()-1;
1399 }
1400 track->SetTracklet(ptrTracklet, index);*/
1401
1402
1403 // register tracklet to track with tracklet creation !!
1404 // PropagateBack : loaded tracklet to the tracker and update index
1405 // RefitInward : update index
1406 // MakeTrack : loaded tracklet to the tracker and update index
1407 if(!tracklets) track->SetTracklet(ptrTracklet, -1);
1408
1409
1410 //Calculate the mean material budget along the path inside the chamber
1411 Double_t xyz0[3]; track->GetXYZ(xyz0);
1412 Double_t alpha = track->GetAlpha();
1413 Double_t xyz1[3], y, z;
1414 if(!track->GetProlongation(x, y, z)) return -1;
1415 xyz1[0] = x * TMath::Cos(alpha) - y * TMath::Sin(alpha);
1416 xyz1[1] = +x * TMath::Sin(alpha) + y * TMath::Cos(alpha);
1417 xyz1[2] = z;
3cfaffa4 1418 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 1419 Double_t param[7];
3cfaffa4 1420 if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param) <=0.) break;
1bf51039 1421 Double_t xrho = param[0]*param[4]; // density*length
1422 Double_t xx0 = param[1]; // radiation length
1423
1424 //Propagate the track
1425 track->PropagateTo(x, xx0, xrho);
1426 if (!AdjustSector(track)) break;
1427
1428 //Update track
1429 Double_t chi2 = track->GetPredictedChi2(ptrTracklet);
1430 if(chi2<1e+10) track->Update(ptrTracklet, chi2);
1bf51039 1431 if(!up) continue;
1432
1433 //Reset material budget if 2 consecutive gold
1434 if(iplane>0 && track->GetTracklet(iplane-1) && ptrTracklet->GetN() + track->GetTracklet(iplane-1)->GetN() > 20) track->SetBudget(2, 0.);
1435 } // end planes loop
1436
1437 // extrapolation
1438 while(ip < np){
1439 if(((up?-1:1) * (points[ip].GetX() - track->GetX()) < 0) && !PropagateToX(*track, points[ip].GetX(), fgkMaxStep)) return -1.;
1440
1441 Double_t xyz[3]; // should also get the covariance
3cfaffa4 1442 track->GetXYZ(xyz);
1443 track->Global2LocalPosition(xyz, track->GetAlpha());
1444 points[ip].SetXYZ(xyz[0], xyz[1], xyz[2]);
1bf51039 1445 ip++;
1446 }
1447
1448 return track->GetChi2();
1449}
3b57a3f7 1450
eb38ed55 1451//_________________________________________________________________________
bb56afff 1452Float_t AliTRDtrackerV1::CalculateChi2Z(AliTRDseedV1 *tracklets, Double_t offset, Double_t slope, Double_t xref)
eb38ed55 1453{
41702fec 1454 //
1455 // Calculates the chi2-value of the track in z-Direction including tilting pad correction.
1456 // A linear dependence on the x-value serves as a model.
1457 // The parameters are related to the tilted Riemann fit.
1458 // Parameters: - Array of tracklets (AliTRDseedV1) related to the track candidate
1459 // - the offset for the reference x
1460 // - the slope
1461 // - the reference x position
1462 // Output: - The Chi2 value of the track in z-Direction
1463 //
1464 Float_t chi2Z = 0, nLayers = 0;
053767a4 1465 for (Int_t iLayer = 0; iLayer < AliTRDgeometry::kNlayer; iLayer++) {
41702fec 1466 if(!tracklets[iLayer].IsOK()) continue;
1467 Double_t z = offset + slope * (tracklets[iLayer].GetX0() - xref);
e3cf3d02 1468 chi2Z += TMath::Abs(tracklets[iLayer].GetZfit(0) - z);
41702fec 1469 nLayers++;
1470 }
1471 chi2Z /= TMath::Max((nLayers - 3.0),1.0);
1472 return chi2Z;
eb38ed55 1473}
1474
bccda319 1475//_____________________________________________________________________________
1476Int_t AliTRDtrackerV1::PropagateToX(AliTRDtrackV1 &t, Double_t xToGo, Double_t maxStep)
1477{
41702fec 1478 //
1479 // Starting from current X-position of track <t> this function
1480 // extrapolates the track up to radial position <xToGo>.
1481 // Returns 1 if track reaches the plane, and 0 otherwise
1482 //
bccda319 1483
41702fec 1484 const Double_t kEpsilon = 0.00001;
bccda319 1485
41702fec 1486 // Current track X-position
1487 Double_t xpos = t.GetX();
bccda319 1488
41702fec 1489 // Direction: inward or outward
1490 Double_t dir = (xpos < xToGo) ? 1.0 : -1.0;
bccda319 1491
41702fec 1492 while (((xToGo - xpos) * dir) > kEpsilon) {
bccda319 1493
41702fec 1494 Double_t xyz0[3];
1495 Double_t xyz1[3];
1496 Double_t param[7];
1497 Double_t x;
1498 Double_t y;
1499 Double_t z;
bccda319 1500
41702fec 1501 // The next step size
1502 Double_t step = dir * TMath::Min(TMath::Abs(xToGo-xpos),maxStep);
bccda319 1503
41702fec 1504 // Get the global position of the starting point
1505 t.GetXYZ(xyz0);
bccda319 1506
41702fec 1507 // X-position after next step
1508 x = xpos + step;
bccda319 1509
41702fec 1510 // Get local Y and Z at the X-position of the next step
1511 if (!t.GetProlongation(x,y,z)) {
1512 return 0; // No prolongation possible
1513 }
bccda319 1514
41702fec 1515 // The global position of the end point of this prolongation step
1516 xyz1[0] = x * TMath::Cos(t.GetAlpha()) - y * TMath::Sin(t.GetAlpha());
1517 xyz1[1] = +x * TMath::Sin(t.GetAlpha()) + y * TMath::Cos(t.GetAlpha());
1518 xyz1[2] = z;
bccda319 1519
41702fec 1520 // Calculate the mean material budget between start and
1521 // end point of this prolongation step
83dea92e 1522 if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param)<=0.) return 0;
bccda319 1523
41702fec 1524 // Propagate the track to the X-position after the next step
9c87a076 1525 if (!t.PropagateTo(x, param[1], param[0]*param[4])) return 0;
bccda319 1526
41702fec 1527 // Rotate the track if necessary
1528 AdjustSector(&t);
bccda319 1529
41702fec 1530 // New track X-position
1531 xpos = t.GetX();
bccda319 1532
41702fec 1533 }
bccda319 1534
41702fec 1535 return 1;
bccda319 1536
1537}
1538
eb38ed55 1539
1540//_____________________________________________________________________________
1541Int_t AliTRDtrackerV1::ReadClusters(TClonesArray* &array, TTree *clusterTree) const
1542{
41702fec 1543 //
1544 // Reads AliTRDclusters from the file.
1545 // The names of the cluster tree and branches
1546 // should match the ones used in AliTRDclusterizer::WriteClusters()
1547 //
1548
1549 Int_t nsize = Int_t(clusterTree->GetTotBytes() / (sizeof(AliTRDcluster)));
1550 TObjArray *clusterArray = new TObjArray(nsize+1000);
1551
1552 TBranch *branch = clusterTree->GetBranch("TRDcluster");
1553 if (!branch) {
1554 AliError("Can't get the branch !");
1555 return 1;
1556 }
1557 branch->SetAddress(&clusterArray);
1558
1559 if(!fClusters){
8ae98148 1560 Float_t nclusters = fReconstructor->GetRecoParam()->GetNClusters();
1561 if(fReconstructor->IsHLT()) nclusters /= AliTRDgeometry::kNsector;
1562 array = new TClonesArray("AliTRDcluster", Int_t(nclusters));
41702fec 1563 array->SetOwner(kTRUE);
1564 }
1565
1566 // Loop through all entries in the tree
1567 Int_t nEntries = (Int_t) clusterTree->GetEntries();
1568 Int_t nbytes = 0;
1569 Int_t ncl = 0;
1570 AliTRDcluster *c = 0x0;
1571 for (Int_t iEntry = 0; iEntry < nEntries; iEntry++) {
1572 // Import the tree
1573 nbytes += clusterTree->GetEvent(iEntry);
1574
1575 // Get the number of points in the detector
1576 Int_t nCluster = clusterArray->GetEntriesFast();
1577 for (Int_t iCluster = 0; iCluster < nCluster; iCluster++) {
1578 if(!(c = (AliTRDcluster *) clusterArray->UncheckedAt(iCluster))) continue;
1579 c->SetInChamber();
1580 new((*fClusters)[ncl++]) AliTRDcluster(*c);
1581 delete (clusterArray->RemoveAt(iCluster));
1582 }
1583
1584 }
1585 delete clusterArray;
1586
1587 return 0;
eb38ed55 1588}
1589
1590//_____________________________________________________________________________
1591Int_t AliTRDtrackerV1::LoadClusters(TTree *cTree)
1592{
41702fec 1593 //
66f6bfd9 1594 // Fills clusters into TRD tracking sectors
41702fec 1595 //
41702fec 1596
48f8adf3 1597 if(!fReconstructor->IsWritingClusters()){
1598 fClusters = AliTRDReconstructor::GetClusters();
1599 } else {
66f6bfd9 1600 if (ReadClusters(fClusters, cTree)) {
1601 AliError("Problem with reading the clusters !");
1602 return 1;
1603 }
1604 }
1605 SetClustersOwner();
1606
48f8adf3 1607 if(!fClusters || !fClusters->GetEntriesFast()){
66f6bfd9 1608 AliInfo("No TRD clusters");
41702fec 1609 return 1;
1610 }
66f6bfd9 1611
1612 //Int_t nin =
1613 BuildTrackingContainers();
1614
1615 //Int_t ncl = fClusters->GetEntriesFast();
1616 //AliInfo(Form("Clusters %d [%6.2f %% in the active volume]", ncl, 100.*float(nin)/ncl));
1617
1618 return 0;
1619}
1620
1621//_____________________________________________________________________________
1622Int_t AliTRDtrackerV1::LoadClusters(TClonesArray *clusters)
1623{
1624 //
1625 // Fills clusters into TRD tracking sectors
1626 // Function for use in the HLT
1627
1628 if(!clusters || !clusters->GetEntriesFast()){
1629 AliInfo("No TRD clusters");
41702fec 1630 return 1;
1631 }
1632
66f6bfd9 1633 fClusters = clusters;
1634 SetClustersOwner();
1635
1636 //Int_t nin =
1637 BuildTrackingContainers();
1638
1639 //Int_t ncl = fClusters->GetEntriesFast();
1640 //AliInfo(Form("Clusters %d [%6.2f %% in the active volume]", ncl, 100.*float(nin)/ncl));
1641
1642 return 0;
1643}
1644
1645
1646//____________________________________________________________________
1647Int_t AliTRDtrackerV1::BuildTrackingContainers()
1648{
1649// Building tracking containers for clusters
1650
1651 Int_t nin =0, icl = fClusters->GetEntriesFast();
41702fec 1652 while (icl--) {
1653 AliTRDcluster *c = (AliTRDcluster *) fClusters->UncheckedAt(icl);
1654 if(c->IsInChamber()) nin++;
1655 Int_t detector = c->GetDetector();
1656 Int_t sector = fGeom->GetSector(detector);
053767a4 1657 Int_t stack = fGeom->GetStack(detector);
1658 Int_t layer = fGeom->GetLayer(detector);
41702fec 1659
053767a4 1660 fTrSec[sector].GetChamber(stack, layer, kTRUE)->InsertCluster(c, icl);
41702fec 1661 }
b0a48c4d 1662
1663 const AliTRDCalDet *cal = AliTRDcalibDB::Instance()->GetT0Det();
053767a4 1664 for(int isector =0; isector<AliTRDgeometry::kNsector; isector++){
41702fec 1665 if(!fTrSec[isector].GetNChambers()) continue;
b0a48c4d 1666 fTrSec[isector].Init(fReconstructor, cal);
41702fec 1667 }
66f6bfd9 1668
1669 return nin;
eb38ed55 1670}
1671
1672
66f6bfd9 1673
0906e73e 1674//____________________________________________________________________
1675void AliTRDtrackerV1::UnloadClusters()
1676{
41702fec 1677 //
1678 // Clears the arrays of clusters and tracks. Resets sectors and timebins
1679 //
0906e73e 1680
41702fec 1681 if(fTracks) fTracks->Delete();
1682 if(fTracklets) fTracklets->Delete();
48f8adf3 1683 if(fClusters){
1684 if(IsClustersOwner()) fClusters->Delete();
1685
1686 // save clusters array in the reconstructor for further use.
1687 if(!fReconstructor->IsWritingClusters()){
1688 AliTRDReconstructor::SetClusters(fClusters);
1689 SetClustersOwner(kFALSE);
1690 } else AliTRDReconstructor::SetClusters(0x0);
1691 }
0906e73e 1692
053767a4 1693 for (int i = 0; i < AliTRDgeometry::kNsector; i++) fTrSec[i].Clear();
0906e73e 1694
41702fec 1695 // Increment the Event Number
1696 AliTRDtrackerDebug::SetEventNumber(AliTRDtrackerDebug::GetEventNumber() + 1);
eb38ed55 1697}
0906e73e 1698
b1957d3c 1699//____________________________________________________________________
1700void AliTRDtrackerV1::UseClusters(const AliKalmanTrack *t, Int_t) const
1701{
1702 const AliTRDtrackV1 *track = dynamic_cast<const AliTRDtrackV1*>(t);
1703 if(!track) return;
1704
1705 AliTRDseedV1 *tracklet = 0x0;
1706 for(Int_t ily=AliTRDgeometry::kNlayer; ily--;){
1707 if(!(tracklet = track->GetTracklet(ily))) continue;
1708 AliTRDcluster *c = 0x0;
1709 for(Int_t ic=AliTRDseed::knTimebins; ic--;){
1710 if(!(c=tracklet->GetClusters(ic))) continue;
1711 c->Use();
1712 }
1713 }
1714}
1715
1716
eb38ed55 1717//_____________________________________________________________________________
1718Bool_t AliTRDtrackerV1::AdjustSector(AliTRDtrackV1 *track)
1719{
41702fec 1720 //
1721 // Rotates the track when necessary
1722 //
1723
1724 Double_t alpha = AliTRDgeometry::GetAlpha();
1725 Double_t y = track->GetY();
1726 Double_t ymax = track->GetX()*TMath::Tan(0.5*alpha);
3cfaffa4 1727
41702fec 1728 if (y > ymax) {
1729 if (!track->Rotate( alpha)) {
1730 return kFALSE;
1731 }
1732 }
1733 else if (y < -ymax) {
1734 if (!track->Rotate(-alpha)) {
1735 return kFALSE;
1736 }
1737 }
1738
1739 return kTRUE;
0906e73e 1740
1741}
1742
eb38ed55 1743
0906e73e 1744//____________________________________________________________________
1745AliTRDseedV1* AliTRDtrackerV1::GetTracklet(AliTRDtrackV1 *track, Int_t p, Int_t &idx)
1746{
41702fec 1747 // Find tracklet for TRD track <track>
1748 // Parameters
1749 // - track
1750 // - sector
1751 // - plane
1752 // - index
1753 // Output
1754 // tracklet
1755 // index
1756 // Detailed description
1757 //
1758 idx = track->GetTrackletIndex(p);
1759 AliTRDseedV1 *tracklet = (idx==0xffff) ? 0x0 : (AliTRDseedV1*)fTracklets->UncheckedAt(idx);
1760
1761 return tracklet;
0906e73e 1762}
1763
1764//____________________________________________________________________
3b57a3f7 1765AliTRDseedV1* AliTRDtrackerV1::SetTracklet(AliTRDseedV1 *tracklet)
0906e73e 1766{
41702fec 1767 // Add this tracklet to the list of tracklets stored in the tracker
1768 //
1769 // Parameters
1770 // - tracklet : pointer to the tracklet to be added to the list
1771 //
1772 // Output
1773 // - the index of the new tracklet in the tracker tracklets list
1774 //
1775 // Detailed description
1776 // Build the tracklets list if it is not yet created (late initialization)
1777 // and adds the new tracklet to the list.
1778 //
1779 if(!fTracklets){
053767a4 1780 fTracklets = new TClonesArray("AliTRDseedV1", AliTRDgeometry::Nsector()*kMaxTracksStack);
41702fec 1781 fTracklets->SetOwner(kTRUE);
1782 }
1783 Int_t nentries = fTracklets->GetEntriesFast();
1784 return new ((*fTracklets)[nentries]) AliTRDseedV1(*tracklet);
972ef65e 1785}
1786
d20df6fc 1787//____________________________________________________________________
1788AliTRDtrackV1* AliTRDtrackerV1::SetTrack(AliTRDtrackV1 *track)
1789{
1790 // Add this track to the list of tracks stored in the tracker
1791 //
1792 // Parameters
1793 // - track : pointer to the track to be added to the list
1794 //
1795 // Output
1796 // - the pointer added
1797 //
1798 // Detailed description
1799 // Build the tracks list if it is not yet created (late initialization)
1800 // and adds the new track to the list.
1801 //
1802 if(!fTracks){
053767a4 1803 fTracks = new TClonesArray("AliTRDtrackV1", AliTRDgeometry::Nsector()*kMaxTracksStack);
d20df6fc 1804 fTracks->SetOwner(kTRUE);
1805 }
1806 Int_t nentries = fTracks->GetEntriesFast();
1807 return new ((*fTracks)[nentries]) AliTRDtrackV1(*track);
1808}
1809
1810
0906e73e 1811
e4f2f73d 1812//____________________________________________________________________
eb38ed55 1813Int_t AliTRDtrackerV1::Clusters2TracksSM(Int_t sector, AliESDEvent *esd)
e4f2f73d 1814{
41702fec 1815 //
1816 // Steer tracking for one SM.
1817 //
1818 // Parameters :
1819 // sector : Array of (SM) propagation layers containing clusters
1820 // esd : The current ESD event. On output it contains the also
1821 // the ESD (TRD) tracks found in this SM.
1822 //
1823 // Output :
1824 // Number of tracks found in this TRD supermodule.
1825 //
1826 // Detailed description
1827 //
1828 // 1. Unpack AliTRDpropagationLayers objects for each stack.
1829 // 2. Launch stack tracking.
1830 // See AliTRDtrackerV1::Clusters2TracksStack() for details.
1831 // 3. Pack results in the ESD event.
1832 //
1833
1834 // allocate space for esd tracks in this SM
1835 TClonesArray esdTrackList("AliESDtrack", 2*kMaxTracksStack);
1836 esdTrackList.SetOwner();
1837
1838 Int_t nTracks = 0;
1839 Int_t nChambers = 0;
1840 AliTRDtrackingChamber **stack = 0x0, *chamber = 0x0;
053767a4 1841 for(int istack = 0; istack<AliTRDgeometry::kNstack; istack++){
41702fec 1842 if(!(stack = fTrSec[sector].GetStack(istack))) continue;
1843 nChambers = 0;
053767a4 1844 for(int ilayer=0; ilayer<AliTRDgeometry::kNlayer; ilayer++){
1845 if(!(chamber = stack[ilayer])) continue;
3a039a31 1846 if(chamber->GetNClusters() < fgNTimeBins * fReconstructor->GetRecoParam() ->GetFindableClusters()) continue;
41702fec 1847 nChambers++;
053767a4 1848 //AliInfo(Form("sector %d stack %d layer %d clusters %d", sector, istack, ilayer, chamber->GetNClusters()));
41702fec 1849 }
1850 if(nChambers < 4) continue;
1851 //AliInfo(Form("Doing stack %d", istack));
1852 nTracks += Clusters2TracksStack(stack, &esdTrackList);
1853 }
1854 //AliInfo(Form("Found %d tracks in SM %d [%d]\n", nTracks, sector, esd->GetNumberOfTracks()));
1855
1856 for(int itrack=0; itrack<nTracks; itrack++)
1857 esd->AddTrack((AliESDtrack*)esdTrackList[itrack]);
1858
1859 // Reset Track and Candidate Number
1860 AliTRDtrackerDebug::SetCandidateNumber(0);
1861 AliTRDtrackerDebug::SetTrackNumber(0);
1862 return nTracks;
e4f2f73d 1863}
1864
1865//____________________________________________________________________
eb38ed55 1866Int_t AliTRDtrackerV1::Clusters2TracksStack(AliTRDtrackingChamber **stack, TClonesArray *esdTrackList)
e4f2f73d 1867{
41702fec 1868 //
1869 // Make tracks in one TRD stack.
1870 //
1871 // Parameters :
1872 // layer : Array of stack propagation layers containing clusters
1873 // esdTrackList : Array of ESD tracks found by the stand alone tracker.
1874 // On exit the tracks found in this stack are appended.
1875 //
1876 // Output :
1877 // Number of tracks found in this stack.
1878 //
1879 // Detailed description
1880 //
1881 // 1. Find the 3 most useful seeding chambers. See BuildSeedingConfigs() for details.
1882 // 2. Steer AliTRDtrackerV1::MakeSeeds() for 3 seeding layer configurations.
1883 // See AliTRDtrackerV1::MakeSeeds() for more details.
1884 // 3. Arrange track candidates in decreasing order of their quality
1885 // 4. Classify tracks in 5 categories according to:
1886 // a) number of layers crossed
1887 // b) track quality
1888 // 5. Sign clusters by tracks in decreasing order of track quality
1889 // 6. Build AliTRDtrack out of seeding tracklets
1890 // 7. Cook MC label
1891 // 8. Build ESD track and register it to the output list
1892 //
1893
b0a48c4d 1894 const AliTRDCalDet *cal = AliTRDcalibDB::Instance()->GetT0Det();
41702fec 1895 AliTRDtrackingChamber *chamber = 0x0;
1896 AliTRDseedV1 sseed[kMaxTracksStack*6]; // to be initialized
1897 Int_t pars[4]; // MakeSeeds parameters
1898
1899 //Double_t alpha = AliTRDgeometry::GetAlpha();
1900 //Double_t shift = .5 * alpha;
1901 Int_t configs[kNConfigs];
1902
1903 // Build initial seeding configurations
1904 Double_t quality = BuildSeedingConfigs(stack, configs);
3a039a31 1905 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){
41702fec 1906 AliInfo(Form("Plane config %d %d %d Quality %f"
1907 , configs[0], configs[1], configs[2], quality));
1908 }
d931f2aa 1909
41702fec 1910
1911 // Initialize contors
1912 Int_t ntracks, // number of TRD track candidates
1913 ntracks1, // number of registered TRD tracks/iter
1914 ntracks2 = 0; // number of all registered TRD tracks in stack
1915 fSieveSeeding = 0;
d931f2aa 1916
1917 // Get stack index
1918 Int_t ic = 0; AliTRDtrackingChamber **cIter = &stack[0];
1919 while(ic<kNPlanes && !(*cIter)){ic++; cIter++;}
1920 if(!(*cIter)) return ntracks2;
1921 Int_t istack = fGeom->GetStack((*cIter)->GetDetector());
1922
41702fec 1923 do{
1924 // Loop over seeding configurations
1925 ntracks = 0; ntracks1 = 0;
1926 for (Int_t iconf = 0; iconf<3; iconf++) {
1927 pars[0] = configs[iconf];
1928 pars[1] = ntracks;
d931f2aa 1929 pars[2] = istack;
41702fec 1930 ntracks = MakeSeeds(stack, &sseed[6*ntracks], pars);
1931 if(ntracks == kMaxTracksStack) break;
1932 }
3a039a31 1933 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1) AliInfo(Form("Candidate TRD tracks %d in iteration %d.", ntracks, fSieveSeeding));
41702fec 1934
1935 if(!ntracks) break;
1936
1937 // Sort the seeds according to their quality
1938 Int_t sort[kMaxTracksStack];
1939 TMath::Sort(ntracks, fTrackQuality, sort, kTRUE);
1940
1941 // Initialize number of tracks so far and logic switches
1942 Int_t ntracks0 = esdTrackList->GetEntriesFast();
1943 Bool_t signedTrack[kMaxTracksStack];
1944 Bool_t fakeTrack[kMaxTracksStack];
1945 for (Int_t i=0; i<ntracks; i++){
1946 signedTrack[i] = kFALSE;
1947 fakeTrack[i] = kFALSE;
1948 }
1949 //AliInfo("Selecting track candidates ...");
1950
1951 // Sieve clusters in decreasing order of track quality
1952 Double_t trackParams[7];
1953 // AliTRDseedV1 *lseed = 0x0;
1954 Int_t jSieve = 0, candidates;
1955 do{
1956 //AliInfo(Form("\t\tITER = %i ", jSieve));
1957
1958 // Check track candidates
1959 candidates = 0;
1960 for (Int_t itrack = 0; itrack < ntracks; itrack++) {
804bb02e 1961 Int_t trackIndex = sort[itrack];
1962 if (signedTrack[trackIndex] || fakeTrack[trackIndex]) continue;
41702fec 1963
1964
804bb02e 1965 // Calculate track parameters from tracklets seeds
804bb02e 1966 Int_t ncl = 0;
1967 Int_t nused = 0;
1968 Int_t nlayers = 0;
1969 Int_t findable = 0;
1970 for (Int_t jLayer = 0; jLayer < kNPlanes; jLayer++) {
1971 Int_t jseed = kNPlanes*trackIndex+jLayer;
1972 if(!sseed[jseed].IsOK()) continue;
1973 if (TMath::Abs(sseed[jseed].GetYref(0) / sseed[jseed].GetX0()) < 0.15) findable++;
1974
1975 sseed[jseed].UpdateUsed();
1976 ncl += sseed[jseed].GetN2();
1977 nused += sseed[jseed].GetNUsed();
1978 nlayers++;
804bb02e 1979 }
1980
41702fec 1981 // Filter duplicated tracks
1982 if (nused > 30){
1983 //printf("Skip %d nused %d\n", trackIndex, nused);
1984 fakeTrack[trackIndex] = kTRUE;
1985 continue;
1986 }
1987 if (Float_t(nused)/ncl >= .25){
1988 //printf("Skip %d nused/ncl >= .25\n", trackIndex);
1989 fakeTrack[trackIndex] = kTRUE;
1990 continue;
1991 }
1992
1993 // Classify tracks
1994 Bool_t skip = kFALSE;
1995 switch(jSieve){
1996 case 0:
1997 if(nlayers < 6) {skip = kTRUE; break;}
1998 if(TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -5.){skip = kTRUE; break;}
1999 break;
2000
2001 case 1:
2002 if(nlayers < findable){skip = kTRUE; break;}
2003 if(TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -4.){skip = kTRUE; break;}
2004 break;
2005
2006 case 2:
2007 if ((nlayers == findable) || (nlayers == 6)) { skip = kTRUE; break;}
2008 if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -6.0){skip = kTRUE; break;}
2009 break;
2010
2011 case 3:
2012 if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -5.){skip = kTRUE; break;}
2013 break;
2014
2015 case 4:
2016 if (nlayers == 3){skip = kTRUE; break;}
2017 //if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) - nused/(nlayers-3.0) < -15.0){skip = kTRUE; break;}
2018 break;
2019 }
2020 if(skip){
2021 candidates++;
2022 //printf("REJECTED : %d [%d] nlayers %d trackQuality = %e nused %d\n", itrack, trackIndex, nlayers, fTrackQuality[trackIndex], nused);
2023 continue;
2024 }
2025 signedTrack[trackIndex] = kTRUE;
2026
41702fec 2027
2028 // Sign clusters
2029 AliTRDcluster *cl = 0x0; Int_t clusterIndex = -1;
be24510a 2030 for (Int_t jLayer = 0; jLayer < kNPlanes; jLayer++) {
41702fec 2031 Int_t jseed = kNPlanes*trackIndex+jLayer;
2032 if(!sseed[jseed].IsOK()) continue;
2033 if(TMath::Abs(sseed[jseed].GetYfit(1) - sseed[jseed].GetYfit(1)) >= .2) continue; // check this condition with Marian
2034 sseed[jseed].UseClusters();
2035 if(!cl){
90cf7133 2036 ic = 0;
41702fec 2037 while(!(cl = sseed[jseed].GetClusters(ic))) ic++;
2038 clusterIndex = sseed[jseed].GetIndexes(ic);
2039 }
2040 }
2041 if(!cl) continue;
2042
2043
2044 // Build track parameters
2045 AliTRDseedV1 *lseed =&sseed[trackIndex*6];
e79f8eb0 2046/* Int_t idx = 0;
41702fec 2047 while(idx<3 && !lseed->IsOK()) {
2048 idx++;
2049 lseed++;
e79f8eb0 2050 }*/
e79f8eb0 2051 Double_t x = lseed->GetX0();// - 3.5;
41702fec 2052 trackParams[0] = x; //NEW AB
e79f8eb0 2053 trackParams[1] = lseed->GetYref(0); // lseed->GetYat(x);
2054 trackParams[2] = lseed->GetZref(0); // lseed->GetZat(x);
2055 trackParams[3] = TMath::Sin(TMath::ATan(lseed->GetYref(1)));
41702fec 2056 trackParams[4] = lseed->GetZref(1) / TMath::Sqrt(1. + lseed->GetYref(1) * lseed->GetYref(1));
be24510a 2057 trackParams[5] = lseed->GetC();
41702fec 2058 Int_t ich = 0; while(!(chamber = stack[ich])) ich++;
2059 trackParams[6] = fGeom->GetSector(chamber->GetDetector());/* *alpha+shift; // Supermodule*/
2060
3a039a31 2061 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){
41702fec 2062 AliInfo(Form("Track %d [%d] nlayers %d trackQuality = %e nused %d, yref = %3.3f", itrack, trackIndex, nlayers, fTrackQuality[trackIndex], nused, trackParams[1]));
2063
2064 Int_t nclusters = 0;
2065 AliTRDseedV1 *dseed[6];
804bb02e 2066
2067 // Build track label - what happens if measured data ???
2068 Int_t labels[1000];
2069 Int_t outlab[1000];
2070 Int_t nlab = 0;
d877f55f 2071
2072 Int_t labelsall[1000];
2073 Int_t nlabelsall = 0;
2074 Int_t naccepted = 0;
2075
804bb02e 2076 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
2077 Int_t jseed = kNPlanes*trackIndex+iLayer;
2078 dseed[iLayer] = new AliTRDseedV1(sseed[jseed]);
2079 dseed[iLayer]->SetOwner();
2080 nclusters += sseed[jseed].GetN2();
2081 if(!sseed[jseed].IsOK()) continue;
2082 for(int ilab=0; ilab<2; ilab++){
2083 if(sseed[jseed].GetLabels(ilab) < 0) continue;
2084 labels[nlab] = sseed[jseed].GetLabels(ilab);
2085 nlab++;
2086 }
d877f55f 2087
2088 // Cooking label
2089 for (Int_t itime = 0; itime < fgNTimeBins; itime++) {
2090 if(!sseed[jseed].IsUsable(itime)) continue;
2091 naccepted++;
2092 Int_t tindex = 0, ilab = 0;
2093 while(ilab<3 && (tindex = sseed[jseed].GetClusters(itime)->GetLabel(ilab)) >= 0){
2094 labelsall[nlabelsall++] = tindex;
2095 ilab++;
2096 }
2097 }
41702fec 2098 }
804bb02e 2099 Freq(nlab,labels,outlab,kFALSE);
2100 Int_t label = outlab[0];
2101 Int_t frequency = outlab[1];
2102 Freq(nlabelsall,labelsall,outlab,kFALSE);
2103 Int_t label1 = outlab[0];
2104 Int_t label2 = outlab[2];
2105 Float_t fakeratio = (naccepted - outlab[1]) / Float_t(naccepted);
2106
41702fec 2107 //Int_t eventNrInFile = esd->GetEventNumberInFile();
2108 //AliInfo(Form("Number of clusters %d.", nclusters));
2109 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2110 Int_t trackNumber = AliTRDtrackerDebug::GetTrackNumber();
2111 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
29f95561 2112 TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
41702fec 2113 cstreamer << "Clusters2TracksStack"
2114 << "EventNumber=" << eventNumber
2115 << "TrackNumber=" << trackNumber
2116 << "CandidateNumber=" << candidateNumber
2117 << "Iter=" << fSieveSeeding
2118 << "Like=" << fTrackQuality[trackIndex]
2119 << "S0.=" << dseed[0]
2120 << "S1.=" << dseed[1]
2121 << "S2.=" << dseed[2]
2122 << "S3.=" << dseed[3]
2123 << "S4.=" << dseed[4]
2124 << "S5.=" << dseed[5]
2125 << "p0=" << trackParams[0]
2126 << "p1=" << trackParams[1]
2127 << "p2=" << trackParams[2]
2128 << "p3=" << trackParams[3]
2129 << "p4=" << trackParams[4]
2130 << "p5=" << trackParams[5]
2131 << "p6=" << trackParams[6]
2132 << "Label=" << label
2133 << "Label1=" << label1
2134 << "Label2=" << label2
2135 << "FakeRatio=" << fakeratio
2136 << "Freq=" << frequency
2137 << "Ncl=" << ncl
2138 << "NLayers=" << nlayers
2139 << "Findable=" << findable
41702fec 2140 << "NUsed=" << nused
2141 << "\n";
2142 }
2143
2144 AliTRDtrackV1 *track = MakeTrack(&sseed[trackIndex*kNPlanes], trackParams);
2145 if(!track){
2146 AliWarning("Fail to build a TRD Track.");
2147 continue;
2148 }
76b60503 2149
41702fec 2150 //AliInfo("End of MakeTrack()");
098c3c3d 2151 AliESDtrack *esdTrack = new ((*esdTrackList)[ntracks0++]) AliESDtrack();
2152 esdTrack->UpdateTrackParams(track, AliESDtrack::kTRDout);
2153 esdTrack->SetLabel(track->GetLabel());
2154 track->UpdateESDtrack(esdTrack);
41702fec 2155 // write ESD-friends if neccessary
3a039a31 2156 if (fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 0){
41702fec 2157 AliTRDtrackV1 *calibTrack = new AliTRDtrackV1(*track);
2158 calibTrack->SetOwner();
098c3c3d 2159 esdTrack->AddCalibObject(calibTrack);
41702fec 2160 }
41702fec 2161 ntracks1++;
2162 AliTRDtrackerDebug::SetTrackNumber(AliTRDtrackerDebug::GetTrackNumber() + 1);
2163 }
2164
2165 jSieve++;
2166 } while(jSieve<5 && candidates); // end track candidates sieve
2167 if(!ntracks1) break;
2168
2169 // increment counters
2170 ntracks2 += ntracks1;
4302c900 2171
2172 if(fReconstructor->IsHLT()) break;
41702fec 2173 fSieveSeeding++;
2174
2175 // Rebuild plane configurations and indices taking only unused clusters into account
2176 quality = BuildSeedingConfigs(stack, configs);
3a039a31 2177 if(quality < 1.E-7) break; //fReconstructor->GetRecoParam() ->GetPlaneQualityThreshold()) break;
41702fec 2178
2179 for(Int_t ip = 0; ip < kNPlanes; ip++){
2180 if(!(chamber = stack[ip])) continue;
b0a48c4d 2181 chamber->Build(fGeom, cal);//Indices(fSieveSeeding);
41702fec 2182 }
2183
3a039a31 2184 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){
41702fec 2185 AliInfo(Form("Sieve level %d Plane config %d %d %d Quality %f", fSieveSeeding, configs[0], configs[1], configs[2], quality));
2186 }
2187 } while(fSieveSeeding<10); // end stack clusters sieve
2188
2189
2190
2191 //AliInfo(Form("Registered TRD tracks %d in stack %d.", ntracks2, pars[1]));
2192
2193 return ntracks2;
e4f2f73d 2194}
2195
2196//___________________________________________________________________
eb38ed55 2197Double_t AliTRDtrackerV1::BuildSeedingConfigs(AliTRDtrackingChamber **stack, Int_t *configs)
e4f2f73d 2198{
41702fec 2199 //
2200 // Assign probabilities to chambers according to their
2201 // capability of producing seeds.
2202 //
2203 // Parameters :
2204 //
2205 // layers : Array of stack propagation layers for all 6 chambers in one stack
2206 // configs : On exit array of configuration indexes (see GetSeedingConfig()
2207 // for details) in the decreasing order of their seeding probabilities.
2208 //
2209 // Output :
2210 //
2211 // Return top configuration quality
2212 //
2213 // Detailed description:
2214 //
2215 // To each chamber seeding configuration (see GetSeedingConfig() for
2216 // the list of all configurations) one defines 2 quality factors:
2217 // - an apriori topological quality (see GetSeedingConfig() for details) and
2218 // - a data quality based on the uniformity of the distribution of
2219 // clusters over the x range (time bins population). See CookChamberQA() for details.
2220 // The overall chamber quality is given by the product of this 2 contributions.
2221 //
2222
2223 Double_t chamberQ[kNPlanes];
2224 AliTRDtrackingChamber *chamber = 0x0;
2225 for(int iplane=0; iplane<kNPlanes; iplane++){
2226 if(!(chamber = stack[iplane])) continue;
2227 chamberQ[iplane] = (chamber = stack[iplane]) ? chamber->GetQuality() : 0.;
2228 }
2229
2230 Double_t tconfig[kNConfigs];
2231 Int_t planes[4];
2232 for(int iconf=0; iconf<kNConfigs; iconf++){
2233 GetSeedingConfig(iconf, planes);
2234 tconfig[iconf] = fgTopologicQA[iconf];
2235 for(int iplane=0; iplane<4; iplane++) tconfig[iconf] *= chamberQ[planes[iplane]];
2236 }
2237
2238 TMath::Sort((Int_t)kNConfigs, tconfig, configs, kTRUE);
2239 // AliInfo(Form("q[%d] = %f", configs[0], tconfig[configs[0]]));
2240 // AliInfo(Form("q[%d] = %f", configs[1], tconfig[configs[1]]));
2241 // AliInfo(Form("q[%d] = %f", configs[2], tconfig[configs[2]]));
2242
2243 return tconfig[configs[0]];
e4f2f73d 2244}
2245
2246//____________________________________________________________________
eb38ed55 2247Int_t AliTRDtrackerV1::MakeSeeds(AliTRDtrackingChamber **stack, AliTRDseedV1 *sseed, Int_t *ipar)
e4f2f73d 2248{
41702fec 2249 //
2250 // Make tracklet seeds in the TRD stack.
2251 //
2252 // Parameters :
2253 // layers : Array of stack propagation layers containing clusters
2254 // sseed : Array of empty tracklet seeds. On exit they are filled.
2255 // ipar : Control parameters:
2256 // ipar[0] -> seeding chambers configuration
2257 // ipar[1] -> stack index
2258 // ipar[2] -> number of track candidates found so far
2259 //
2260 // Output :
2261 // Number of tracks candidates found.
2262 //
2263 // Detailed description
2264 //
2265 // The following steps are performed:
2266 // 1. Select seeding layers from seeding chambers
2267 // 2. Select seeding clusters from the seeding AliTRDpropagationLayerStack.
2268 // The clusters are taken from layer 3, layer 0, layer 1 and layer 2, in
2269 // this order. The parameters controling the range of accepted clusters in
2270 // layer 0, 1, and 2 are defined in AliTRDchamberTimeBin::BuildCond().
2271 // 3. Helix fit of the cluster set. (see AliTRDtrackerFitter::FitRieman(AliTRDcluster**))
2272 // 4. Initialize seeding tracklets in the seeding chambers.
2273 // 5. Filter 0.
2274 // Chi2 in the Y direction less than threshold ... (1./(3. - sLayer))
2275 // Chi2 in the Z direction less than threshold ... (1./(3. - sLayer))
2276 // 6. Attach clusters to seeding tracklets and find linear approximation of
2277 // the tracklet (see AliTRDseedV1::AttachClustersIter()). The number of used
2278 // clusters used by current seeds should not exceed ... (25).
2279 // 7. Filter 1.
2280 // All 4 seeding tracklets should be correctly constructed (see
2281 // AliTRDseedV1::AttachClustersIter())
2282 // 8. Helix fit of the seeding tracklets
2283 // 9. Filter 2.
2284 // Likelihood calculation of the fit. (See AliTRDtrackerV1::CookLikelihood() for details)
2285 // 10. Extrapolation of the helix fit to the other 2 chambers:
2286 // a) Initialization of extrapolation tracklet with fit parameters
2287 // b) Helix fit of tracklets
2288 // c) Attach clusters and linear interpolation to extrapolated tracklets
2289 // d) Helix fit of tracklets
2290 // 11. Improve seeding tracklets quality by reassigning clusters.
2291 // See AliTRDtrackerV1::ImproveSeedQuality() for details.
2292 // 12. Helix fit of all 6 seeding tracklets and chi2 calculation
2293 // 13. Hyperplane fit and track quality calculation. See AliTRDtrackerFitter::FitHyperplane() for details.
2294 // 14. Cooking labels for tracklets. Should be done only for MC
2295 // 15. Register seeds.
2296 //
2297
2298 AliTRDtrackingChamber *chamber = 0x0;
be24510a 2299 AliTRDcluster *c[kNSeedPlanes] = {0x0, 0x0, 0x0, 0x0}; // initilize seeding clusters
41702fec 2300 AliTRDseedV1 *cseed = &sseed[0]; // initialize tracklets for first track
2301 Int_t ncl, mcl; // working variable for looping over clusters
2302 Int_t index[AliTRDchamberTimeBin::kMaxClustersLayer], jndex[AliTRDchamberTimeBin::kMaxClustersLayer];
2303 // chi2 storage
2304 // chi2[0] = tracklet chi2 on the Z direction
2305 // chi2[1] = tracklet chi2 on the R direction
2306 Double_t chi2[4];
2307
e79f8eb0 2308 // Default positions for the anode wire in all 6 Layers in case of a stack with missing clusters
2309 // Positions taken using cosmic data taken with SM3 after rebuild
d931f2aa 2310 Double_t x_def[kNPlanes] = {300.2, 312.8, 325.4, 338.0, 350.6, 363.2};
41702fec 2311
2312 // this should be data member of AliTRDtrack
2313 Double_t seedQuality[kMaxTracksStack];
2314
2315 // unpack control parameters
2316 Int_t config = ipar[0];
2317 Int_t ntracks = ipar[1];
d931f2aa 2318 Int_t istack = ipar[2];
41702fec 2319 Int_t planes[kNSeedPlanes]; GetSeedingConfig(config, planes);
be24510a 2320 Int_t planesExt[kNPlanes-kNSeedPlanes]; GetExtrapolationConfig(config, planesExt);
2321
2322
41702fec 2323 // Init chambers geometry
41702fec 2324 Double_t hL[kNPlanes]; // Tilting angle
2325 Float_t padlength[kNPlanes]; // pad lenghts
2326 AliTRDpadPlane *pp = 0x0;
2327 for(int iplane=0; iplane<kNPlanes; iplane++){
2328 pp = fGeom->GetPadPlane(iplane, istack);
bb79ccd5 2329 hL[iplane] = TMath::Tan(TMath::DegToRad()*pp->GetTiltingAngle());
41702fec 2330 padlength[iplane] = pp->GetLengthIPad();
2331 }
2332
3a039a31 2333 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){
41702fec 2334 AliInfo(Form("Making seeds Stack[%d] Config[%d] Tracks[%d]...", istack, config, ntracks));
2335 }
2336
d931f2aa 2337 // Build seeding layers
d611c74f 2338 ResetSeedTB();
41702fec 2339 Int_t nlayers = 0;
41702fec 2340 for(int isl=0; isl<kNSeedPlanes; isl++){
2341 if(!(chamber = stack[planes[isl]])) continue;
3a039a31 2342 if(!chamber->GetSeedingLayer(fSeedTB[isl], fGeom, fReconstructor)) continue;
41702fec 2343 nlayers++;
41702fec 2344 }
1ba638fc 2345 if(nlayers < 4) return ntracks;
41702fec 2346
2347
2348 // Start finding seeds
2349 Double_t cond0[4], cond1[4], cond2[4];
2350 Int_t icl = 0;
d611c74f 2351 while((c[3] = (*fSeedTB[3])[icl++])){
41702fec 2352 if(!c[3]) continue;
d611c74f 2353 fSeedTB[0]->BuildCond(c[3], cond0, 0);
2354 fSeedTB[0]->GetClusters(cond0, index, ncl);
41702fec 2355 //printf("Found c[3] candidates 0 %d\n", ncl);
2356 Int_t jcl = 0;
2357 while(jcl<ncl) {
d611c74f 2358 c[0] = (*fSeedTB[0])[index[jcl++]];
41702fec 2359 if(!c[0]) continue;
2360 Double_t dx = c[3]->GetX() - c[0]->GetX();
2361 Double_t theta = (c[3]->GetZ() - c[0]->GetZ())/dx;
2362 Double_t phi = (c[3]->GetY() - c[0]->GetY())/dx;
d611c74f 2363 fSeedTB[1]->BuildCond(c[0], cond1, 1, theta, phi);
2364 fSeedTB[1]->GetClusters(cond1, jndex, mcl);
41702fec 2365 //printf("Found c[0] candidates 1 %d\n", mcl);
2366
2367 Int_t kcl = 0;
2368 while(kcl<mcl) {
d611c74f 2369 c[1] = (*fSeedTB[1])[jndex[kcl++]];
2370 if(!c[1]) continue;
2371 fSeedTB[2]->BuildCond(c[1], cond2, 2, theta, phi);
2372 c[2] = fSeedTB[2]->GetNearestCluster(cond2);
2373 //printf("Found c[1] candidate 2 %p\n", c[2]);
2374 if(!c[2]) continue;
2375
2376 // AliInfo("Seeding clusters found. Building seeds ...");
2377 // for(Int_t i = 0; i < kNSeedPlanes; i++) printf("%i. coordinates: x = %6.3f, y = %6.3f, z = %6.3f\n", i, c[i]->GetX(), c[i]->GetY(), c[i]->GetZ());
2378
804bb02e 2379 for (Int_t il = 0; il < kNPlanes; il++) cseed[il].Reset();
41702fec 2380
d611c74f 2381 FitRieman(c, chi2);
2382
d931f2aa 2383 AliTRDseedV1 *tseed = &cseed[0];
2384 AliTRDtrackingChamber **cIter = &stack[0];
2385 for(int iLayer=0; iLayer<kNPlanes; iLayer++, tseed++, cIter++){
2386 tseed->SetDetector((*cIter) ? (*cIter)->GetDetector() : -1);
43d6ad34 2387 tseed->SetTilt(hL[iLayer]);
2388 tseed->SetPadLength(padlength[iLayer]);
3a039a31 2389 tseed->SetReconstructor(fReconstructor);
d931f2aa 2390 tseed->SetX0((*cIter) ? (*cIter)->GetX() : x_def[iLayer]);
d611c74f 2391 tseed->Init(GetRiemanFitter());
2392 }
2393
2394 Bool_t isFake = kFALSE;
3a039a31 2395 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){
d611c74f 2396 if (c[0]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
2397 if (c[1]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
2398 if (c[2]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
2399
2400 Double_t xpos[4];
2401 for(Int_t l = 0; l < kNSeedPlanes; l++) xpos[l] = fSeedTB[l]->GetX();
2402 Float_t yref[4];
2403 for(int il=0; il<4; il++) yref[il] = cseed[planes[il]].GetYref(0);
2404 Int_t ll = c[3]->GetLabel(0);
2405 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2406 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2407 AliRieman *rim = GetRiemanFitter();
29f95561 2408 TTreeSRedirector &cs0 = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
d611c74f 2409 cs0 << "MakeSeeds0"
2410 <<"EventNumber=" << eventNumber
2411 <<"CandidateNumber=" << candidateNumber
2412 <<"isFake=" << isFake
2413 <<"config=" << config
2414 <<"label=" << ll
2415 <<"chi2z=" << chi2[0]
2416 <<"chi2y=" << chi2[1]
2417 <<"Y2exp=" << cond2[0]
2418 <<"Z2exp=" << cond2[1]
2419 <<"X0=" << xpos[0] //layer[sLayer]->GetX()
2420 <<"X1=" << xpos[1] //layer[sLayer + 1]->GetX()
2421 <<"X2=" << xpos[2] //layer[sLayer + 2]->GetX()
2422 <<"X3=" << xpos[3] //layer[sLayer + 3]->GetX()
2423 <<"yref0=" << yref[0]
2424 <<"yref1=" << yref[1]
2425 <<"yref2=" << yref[2]
2426 <<"yref3=" << yref[3]
2427 <<"c0.=" << c[0]
2428 <<"c1.=" << c[1]
2429 <<"c2.=" << c[2]
2430 <<"c3.=" << c[3]
2431 <<"Seed0.=" << &cseed[planes[0]]
2432 <<"Seed1.=" << &cseed[planes[1]]
2433 <<"Seed2.=" << &cseed[planes[2]]
2434 <<"Seed3.=" << &cseed[planes[3]]
2435 <<"RiemanFitter.=" << rim
2436 <<"\n";
2437 }
3a039a31 2438 if(chi2[0] > fReconstructor->GetRecoParam() ->GetChi2Z()/*7./(3. - sLayer)*//*iter*/){
91834b8d 2439// //AliInfo(Form("Failed chi2 filter on chi2Z [%f].", chi2[0]));
d611c74f 2440 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2441 continue;
2442 }
3a039a31 2443 if(chi2[1] > fReconstructor->GetRecoParam() ->GetChi2Y()/*1./(3. - sLayer)*//*iter*/){
91834b8d 2444// //AliInfo(Form("Failed chi2 filter on chi2Y [%f].", chi2[1]));
d611c74f 2445 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2446 continue;
2447 }
2448 //AliInfo("Passed chi2 filter.");
2449
2450 // try attaching clusters to tracklets
2451 Int_t nUsedCl = 0;
2452 Int_t mlayers = 0;
be24510a 2453 for(int iLayer=0; iLayer<kNSeedPlanes; iLayer++){
d611c74f 2454 Int_t jLayer = planes[iLayer];
2455 if(!cseed[jLayer].AttachClustersIter(stack[jLayer], 5., kFALSE, c[iLayer])) continue;
2456 nUsedCl += cseed[jLayer].GetNUsed();
2457 if(nUsedCl > 25) break;
2458 mlayers++;
2459 }
be24510a 2460
2461 if(mlayers < kNSeedPlanes){
2462 //AliInfo(Form("Failed updating all seeds %d [%d].", mlayers, kNSeedPlanes));
2463 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2464 continue;
2465 }
2466
2467 // temporary exit door for the HLT
4302c900 2468 if(fReconstructor->IsHLT()){
be24510a 2469 // attach clusters to extrapolation chambers
2470 for(int iLayer=0; iLayer<kNPlanes-kNSeedPlanes; iLayer++){
2471 Int_t jLayer = planesExt[iLayer];
2472 if(!(chamber = stack[jLayer])) continue;
2473 cseed[jLayer].AttachClustersIter(chamber, 1000.);
2474 }
4302c900 2475 fTrackQuality[ntracks] = 1.; // dummy value
2476 ntracks++;
218ba867 2477 if(ntracks == kMaxTracksStack) return ntracks;
4302c900 2478 cseed += 6;
2479 continue;
2480 }
2481
be24510a 2482
d611c74f 2483 // fit tracklets and cook likelihood
2484 FitTiltedRieman(&cseed[0], kTRUE);// Update Seeds and calculate Likelihood
91834b8d 2485 Double_t like = CookLikelihood(&cseed[0], planes); // to be checked
d611c74f 2486
3a039a31 2487 if (TMath::Log(1.E-9 + like) < fReconstructor->GetRecoParam() ->GetTrackLikelihood()){
d611c74f 2488 //AliInfo(Form("Failed likelihood %f[%e].", TMath::Log(1.E-9 + like), like));
2489 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2490 continue;
2491 }
2492 //AliInfo(Form("Passed likelihood %f[%e].", TMath::Log(1.E-9 + like), like));
2493
2494 // book preliminary results
2495 seedQuality[ntracks] = like;
2496 fSeedLayer[ntracks] = config;/*sLayer;*/
2497
2498 // attach clusters to the extrapolation seeds
d611c74f 2499 Int_t nusedf = 0; // debug value
be24510a 2500 for(int iLayer=0; iLayer<kNPlanes-kNSeedPlanes; iLayer++){
2501 Int_t jLayer = planesExt[iLayer];
d611c74f 2502 if(!(chamber = stack[jLayer])) continue;
d611c74f 2503
2504 // fit extrapolated seed
2505 if ((jLayer == 0) && !(cseed[1].IsOK())) continue;
2506 if ((jLayer == 5) && !(cseed[4].IsOK())) continue;
2507 AliTRDseedV1 pseed = cseed[jLayer];
2508 if(!pseed.AttachClustersIter(chamber, 1000.)) continue;
2509 cseed[jLayer] = pseed;
2510 nusedf += cseed[jLayer].GetNUsed(); // debug value
2511 FitTiltedRieman(cseed, kTRUE);
2512 }
2513
2514 // AliInfo("Extrapolation done.");
2515 // Debug Stream containing all the 6 tracklets
3a039a31 2516 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){
29f95561 2517 TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
d611c74f 2518 TLinearFitter *tiltedRieman = GetTiltedRiemanFitter();
2519 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2520 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2521 cstreamer << "MakeSeeds1"
2522 << "EventNumber=" << eventNumber
2523 << "CandidateNumber=" << candidateNumber
2524 << "S0.=" << &cseed[0]
2525 << "S1.=" << &cseed[1]
2526 << "S2.=" << &cseed[2]
2527 << "S3.=" << &cseed[3]
2528 << "S4.=" << &cseed[4]
2529 << "S5.=" << &cseed[5]
2530 << "FitterT.=" << tiltedRieman
2531 << "\n";
2532 }
2533
fb872574 2534 if(fReconstructor->GetRecoParam()->HasImproveTracklets() && ImproveSeedQuality(stack, cseed) < 4){
d611c74f 2535 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2536 continue;
2537 }
2538 //AliInfo("Improve seed quality done.");
2539
2540 // fit full track and cook likelihoods
2541 // Double_t curv = FitRieman(&cseed[0], chi2);
2542 // Double_t chi2ZF = chi2[0] / TMath::Max((mlayers - 3.), 1.);
2543 // Double_t chi2RF = chi2[1] / TMath::Max((mlayers - 3.), 1.);
2544
2545 // do the final track fitting (Once with vertex constraint and once without vertex constraint)
2546 Double_t chi2Vals[3];
2547 chi2Vals[0] = FitTiltedRieman(&cseed[0], kFALSE);
91834b8d 2548 if(fReconstructor->GetRecoParam()->IsVertexConstrained())
d611c74f 2549 chi2Vals[1] = FitTiltedRiemanConstraint(&cseed[0], GetZ()); // Do Vertex Constrained fit if desired
2550 else
2551 chi2Vals[1] = 1.;
2552 chi2Vals[2] = GetChi2Z(&cseed[0]) / TMath::Max((mlayers - 3.), 1.);
2553 // Chi2 definitions in testing stage
2554 //chi2Vals[2] = GetChi2ZTest(&cseed[0]);
2555 fTrackQuality[ntracks] = CalculateTrackLikelihood(&cseed[0], &chi2Vals[0]);
2556 //AliInfo("Hyperplane fit done\n");
2557
2558 // finalize tracklets
2559 Int_t labels[12];
2560 Int_t outlab[24];
2561 Int_t nlab = 0;
2562 for (Int_t iLayer = 0; iLayer < 6; iLayer++) {
2563 if (!cseed[iLayer].IsOK()) continue;
2564
2565 if (cseed[iLayer].GetLabels(0) >= 0) {
2566 labels[nlab] = cseed[iLayer].GetLabels(0);
2567 nlab++;
2568 }
2569
2570 if (cseed[iLayer].GetLabels(1) >= 0) {
2571 labels[nlab] = cseed[iLayer].GetLabels(1);
2572 nlab++;
2573 }
2574 }
2575 Freq(nlab,labels,outlab,kFALSE);
2576 Int_t label = outlab[0];
2577 Int_t frequency = outlab[1];
e3cf3d02 2578// for (Int_t iLayer = 0; iLayer < 6; iLayer++) {
2579// cseed[iLayer].SetFreq(frequency);
2580// cseed[iLayer].SetChi2Z(chi2[1]);
2581// }
d611c74f 2582
3a039a31 2583 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){
29f95561 2584 TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
d611c74f 2585 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2586 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2587 TLinearFitter *fitterTC = GetTiltedRiemanFitterConstraint();
2588 TLinearFitter *fitterT = GetTiltedRiemanFitter();
91834b8d 2589 Int_t ncls = 0;
2590 for(Int_t iseed = 0; iseed < kNPlanes; iseed++){
2591 ncls += cseed[iseed].IsOK() ? cseed[iseed].GetN2() : 0;
2592 }
d611c74f 2593 cstreamer << "MakeSeeds2"
2594 << "EventNumber=" << eventNumber
2595 << "CandidateNumber=" << candidateNumber
2596 << "Chi2TR=" << chi2Vals[0]
2597 << "Chi2TC=" << chi2Vals[1]
2598 << "Nlayers=" << mlayers
91834b8d 2599 << "NClusters=" << ncls
d611c74f 2600 << "NUsedS=" << nUsedCl
2601 << "NUsed=" << nusedf
2602 << "Like=" << like
2603 << "S0.=" << &cseed[0]
2604 << "S1.=" << &cseed[1]
2605 << "S2.=" << &cseed[2]
2606 << "S3.=" << &cseed[3]
2607 << "S4.=" << &cseed[4]
2608 << "S5.=" << &cseed[5]
2609 << "Label=" << label
2610 << "Freq=" << frequency
2611 << "FitterT.=" << fitterT
2612 << "FitterTC.=" << fitterTC
2613 << "\n";
2614 }
2615
2616 ntracks++;
2617 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2618 if(ntracks == kMaxTracksStack){
2619 AliWarning(Form("Number of seeds reached maximum allowed (%d) in stack.", kMaxTracksStack));
2620 return ntracks;
2621 }
2622 cseed += 6;
41702fec 2623 }
2624 }
2625 }
41702fec 2626
2627 return ntracks;
e4f2f73d 2628}
2629
2630//_____________________________________________________________________________
0906e73e 2631AliTRDtrackV1* AliTRDtrackerV1::MakeTrack(AliTRDseedV1 *seeds, Double_t *params)
e4f2f73d 2632{
41702fec 2633 //
2634 // Build a TRD track out of tracklet candidates
2635 //
2636 // Parameters :
2637 // seeds : array of tracklets
2638 // params : track parameters (see MakeSeeds() function body for a detailed description)
2639 //
2640 // Output :
2641 // The TRD track.
2642 //
2643 // Detailed description
2644 //
2645 // To be discussed with Marian !!
2646 //
2647
41702fec 2648
2649 Double_t alpha = AliTRDgeometry::GetAlpha();
2650 Double_t shift = AliTRDgeometry::GetAlpha()/2.0;
2651 Double_t c[15];
2652
2653 c[ 0] = 0.2;
2654 c[ 1] = 0.0; c[ 2] = 2.0;
2655 c[ 3] = 0.0; c[ 4] = 0.0; c[ 5] = 0.02;
2656 c[ 6] = 0.0; c[ 7] = 0.0; c[ 8] = 0.0; c[ 9] = 0.1;
2657 c[10] = 0.0; c[11] = 0.0; c[12] = 0.0; c[13] = 0.0; c[14] = params[5]*params[5]*0.01;
2658
d20df6fc 2659 AliTRDtrackV1 track(seeds, &params[1], c, params[0], params[6]*alpha+shift);
2660 track.PropagateTo(params[0]-5.0);
91834b8d 2661 if(fReconstructor->IsHLT()){
2662 AliTRDseedV1 *ptrTracklet = 0x0;
2663 for(Int_t ip=0; ip<kNPlanes; ip++){
2664 track.UnsetTracklet(ip);
2665 ptrTracklet = SetTracklet(&seeds[ip]);
2666 track.SetTracklet(ptrTracklet, fTracklets->GetEntriesFast()-1);
2667 }
d78d7df0 2668 AliTRDtrackV1 *ptrTrack = SetTrack(&track);
2669 ptrTrack->SetReconstructor(fReconstructor);
2670 return ptrTrack;
91834b8d 2671 }
393fda1c 2672
d20df6fc 2673 track.ResetCovariance(1);
e79f8eb0 2674 Int_t nc = TMath::Abs(FollowBackProlongation(track));
393fda1c 2675 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 5){
2676 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2677 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2678 Double_t p[5]; // Track Params for the Debug Stream
2679 track.GetExternalParameters(params[0], p);
29f95561 2680 TTreeSRedirector &cs = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
393fda1c 2681 cs << "MakeTrack"
2682 << "EventNumber=" << eventNumber
2683 << "CandidateNumber=" << candidateNumber
2684 << "nc=" << nc
2685 << "X=" << params[0]
2686 << "Y=" << p[0]
2687 << "Z=" << p[1]
2688 << "snp=" << p[2]
2689 << "tnd=" << p[3]
2690 << "crv=" << p[4]
2691 << "Yin=" << params[1]
2692 << "Zin=" << params[2]
2693 << "snpin=" << params[3]
2694 << "tndin=" << params[4]
2695 << "crvin=" << params[5]
2696 << "track.=" << &track
2697 << "\n";
2698 }
d20df6fc 2699 if (nc < 30) return 0x0;
2700
2701 AliTRDtrackV1 *ptrTrack = SetTrack(&track);
215f7116 2702 ptrTrack->SetReconstructor(fReconstructor);
48f8adf3 2703 ptrTrack->CookLabel(.9);
24253b0a 2704
d20df6fc 2705 // computes PID for track
2706 ptrTrack->CookPID();
2707 // update calibration references using this track
48f8adf3 2708 AliTRDCalibraFillHisto *calibra = AliTRDCalibraFillHisto::Instance();
2709 if (!calibra){
2710 AliInfo("Could not get Calibra instance\n");
2711 if(calibra->GetHisto2d()) calibra->UpdateHistogramsV1(ptrTrack);
2712 }
d20df6fc 2713 return ptrTrack;
e4f2f73d 2714}
2715
0906e73e 2716
e4f2f73d 2717//____________________________________________________________________
eb38ed55 2718Int_t AliTRDtrackerV1::ImproveSeedQuality(AliTRDtrackingChamber **stack, AliTRDseedV1 *cseed)
e4f2f73d 2719{
41702fec 2720 //
2721 // Sort tracklets according to "quality" and try to "improve" the first 4 worst
2722 //
2723 // Parameters :
2724 // layers : Array of propagation layers for a stack/supermodule
2725 // cseed : Array of 6 seeding tracklets which has to be improved
2726 //
2727 // Output :
2728 // cssed : Improved seeds
2729 //
2730 // Detailed description
2731 //
2732 // Iterative procedure in which new clusters are searched for each
2733 // tracklet seed such that the seed quality (see AliTRDseed::GetQuality())
2734 // can be maximized. If some optimization is found the old seeds are replaced.
2735 //
2736 // debug level: 7
2737 //
2738
2739 // make a local working copy
2740 AliTRDtrackingChamber *chamber = 0x0;
2741 AliTRDseedV1 bseed[6];
2742 Int_t nLayers = 0;
2743 for (Int_t jLayer = 0; jLayer < 6; jLayer++) bseed[jLayer] = cseed[jLayer];
2744
2745 Float_t lastquality = 10000.0;
2746 Float_t lastchi2 = 10000.0;
2747 Float_t chi2 = 1000.0;
2748
2749 for (Int_t iter = 0; iter < 4; iter++) {
2750 Float_t sumquality = 0.0;
2751 Float_t squality[6];
2752 Int_t sortindexes[6];
2753
2754 for (Int_t jLayer = 0; jLayer < 6; jLayer++) {
3a039a31 2755 squality[jLayer] = bseed[jLayer].IsOK() ? bseed[jLayer].GetQuality(kTRUE) : 1000.;
41702fec 2756 sumquality += squality[jLayer];
2757 }
2758 if ((sumquality >= lastquality) || (chi2 > lastchi2)) break;
2759
2760 nLayers = 0;
2761 lastquality = sumquality;
2762 lastchi2 = chi2;
2763 if (iter > 0) for (Int_t jLayer = 0; jLayer < 6; jLayer++) cseed[jLayer] = bseed[jLayer];
2764
2765 TMath::Sort(6, squality, sortindexes, kFALSE);
2766 for (Int_t jLayer = 5; jLayer > 1; jLayer--) {
2767 Int_t bLayer = sortindexes[jLayer];
2768 if(!(chamber = stack[bLayer])) continue;
2769 bseed[bLayer].AttachClustersIter(chamber, squality[bLayer], kTRUE);
2770 if(bseed[bLayer].IsOK()) nLayers++;
2771 }
2772
2773 chi2 = FitTiltedRieman(bseed, kTRUE);
3a039a31 2774 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 7){
41702fec 2775 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2776 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2777 TLinearFitter *tiltedRieman = GetTiltedRiemanFitter();
29f95561 2778 TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
41702fec 2779 cstreamer << "ImproveSeedQuality"
2780 << "EventNumber=" << eventNumber
2781 << "CandidateNumber=" << candidateNumber
2782 << "Iteration=" << iter
2783 << "S0.=" << &bseed[0]
2784 << "S1.=" << &bseed[1]
2785 << "S2.=" << &bseed[2]
2786 << "S3.=" << &bseed[3]
2787 << "S4.=" << &bseed[4]
2788 << "S5.=" << &bseed[5]
2789 << "FitterT.=" << tiltedRieman
2790 << "\n";
2791 }
2792 } // Loop: iter
2793
2794 // we are sure that at least 2 tracklets are OK !
2795 return nLayers+2;
e4f2f73d 2796}
2797
eb38ed55 2798//_________________________________________________________________________
2799Double_t AliTRDtrackerV1::CalculateTrackLikelihood(AliTRDseedV1 *tracklets, Double_t *chi2){
41702fec 2800 //
2801 // Calculates the Track Likelihood value. This parameter serves as main quality criterion for
2802 // the track selection
2803 // The likelihood value containes:
2804 // - The chi2 values from the both fitters and the chi2 values in z-direction from a linear fit
2805 // - The Sum of the Parameter |slope_ref - slope_fit|/Sigma of the tracklets
2806 // For all Parameters an exponential dependency is used
2807 //
2808 // Parameters: - Array of tracklets (AliTRDseedV1) related to the track candidate
2809 // - Array of chi2 values:
2810 // * Non-Constrained Tilted Riemann fit
2811 // * Vertex-Constrained Tilted Riemann fit
2812 // * z-Direction from Linear fit
2813 // Output: - The calculated track likelihood
2814 //
2815 // debug level 2
2816 //
2817
2818 Double_t sumdaf = 0, nLayers = 0;
2819 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
2820 if(!tracklets[iLayer].IsOK()) continue;
e3cf3d02 2821 sumdaf += TMath::Abs((tracklets[iLayer].GetYfit(1) - tracklets[iLayer].GetYref(1))/ tracklets[iLayer].GetS2Y());
41702fec 2822 nLayers++;
2823 }
2824 sumdaf /= Float_t (nLayers - 2.0);
2825
2826 Double_t likeChi2Z = TMath::Exp(-chi2[2] * 0.14); // Chi2Z
3a039a31 2827 Double_t likeChi2TC = (fReconstructor->GetRecoParam() ->IsVertexConstrained()) ?
d20df6fc 2828 TMath::Exp(-chi2[1] * 0.677) : 1; // Constrained Tilted Riemann
41702fec 2829 Double_t likeChi2TR = TMath::Exp(-chi2[0] * 0.78); // Non-constrained Tilted Riemann
2830 Double_t likeAF = TMath::Exp(-sumdaf * 3.23);
2831 Double_t trackLikelihood = likeChi2Z * likeChi2TR * likeAF;
2832
3a039a31 2833 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){
41702fec 2834 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2835 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
29f95561 2836 TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
41702fec 2837 cstreamer << "CalculateTrackLikelihood0"
2838 << "EventNumber=" << eventNumber
2839 << "CandidateNumber=" << candidateNumber
2840 << "LikeChi2Z=" << likeChi2Z
2841 << "LikeChi2TR=" << likeChi2TR
2842 << "LikeChi2TC=" << likeChi2TC
2843 << "LikeAF=" << likeAF
2844 << "TrackLikelihood=" << trackLikelihood
2845 << "\n";
2846 }
2847
2848 return trackLikelihood;
e4f2f73d 2849}
2850
2851//____________________________________________________________________
91834b8d 2852Double_t AliTRDtrackerV1::CookLikelihood(AliTRDseedV1 *cseed, Int_t planes[4])
e4f2f73d 2853{
41702fec 2854 //
2855 // Calculate the probability of this track candidate.
2856 //
2857 // Parameters :
2858 // cseeds : array of candidate tracklets
2859 // planes : array of seeding planes (see seeding configuration)
2860 // chi2 : chi2 values (on the Z and Y direction) from the rieman fit of the track.
2861 //
2862 // Output :
2863 // likelihood value
2864 //
2865 // Detailed description
2866 //
2867 // The track quality is estimated based on the following 4 criteria:
2868 // 1. precision of the rieman fit on the Y direction (likea)
2869 // 2. chi2 on the Y direction (likechi2y)
2870 // 3. chi2 on the Z direction (likechi2z)
2871 // 4. number of attached clusters compared to a reference value
2872 // (see AliTRDrecoParam::fkFindable) (likeN)
2873 //
2874 // The distributions for each type of probabilities are given below as of
2875 // (date). They have to be checked to assure consistency of estimation.
2876 //
2877
2878 // ratio of the total number of clusters/track which are expected to be found by the tracker.
91834b8d 2879 const AliTRDrecoParam *fRecoPars = fReconstructor->GetRecoParam();
41702fec 2880
91834b8d 2881 Double_t chi2y = GetChi2Y(&cseed[0]);
2882 Double_t chi2z = GetChi2Z(&cseed[0]);
2883
8ae98148 2884 Float_t nclusters = 0.;
41702fec 2885 Double_t sumda = 0.;
2886 for(UChar_t ilayer = 0; ilayer < 4; ilayer++){
2887 Int_t jlayer = planes[ilayer];
2888 nclusters += cseed[jlayer].GetN2();
e3cf3d02 2889 sumda += TMath::Abs(cseed[jlayer].GetYfit(1) - cseed[jlayer].GetYref(1));
41702fec 2890 }
8ae98148 2891 nclusters *= .25;
2892
5a2e200c 2893 Double_t likea = TMath::Exp(-sumda * fRecoPars->GetPhiSlope());
41702fec 2894 Double_t likechi2y = 0.0000000001;
5a2e200c 2895 if (fReconstructor->IsCosmic() || chi2y < fRecoPars->GetChi2YCut()) likechi2y += TMath::Exp(-TMath::Sqrt(chi2y) * fRecoPars->GetChi2YSlope());
2896 Double_t likechi2z = TMath::Exp(-chi2z * fRecoPars->GetChi2ZSlope());
8ae98148 2897 Double_t likeN = TMath::Exp(-(fRecoPars->GetNMeanClusters() - nclusters) / fRecoPars->GetNSigmaClusters());
41702fec 2898 Double_t like = likea * likechi2y * likechi2z * likeN;
2899
2900 // AliInfo(Form("sumda(%f) chi2[0](%f) chi2[1](%f) likea(%f) likechi2y(%f) likechi2z(%f) nclusters(%d) likeN(%f)", sumda, chi2[0], chi2[1], likea, likechi2y, likechi2z, nclusters, likeN));
3a039a31 2901 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){
41702fec 2902 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2903 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
91834b8d 2904 Int_t nTracklets = 0; Float_t mean_ncls = 0;
2905 for(Int_t iseed=0; iseed < kNPlanes; iseed++){
2906 if(!cseed[iseed].IsOK()) continue;
2907 nTracklets++;
2908 mean_ncls += cseed[iseed].GetN2();
2909 }
2910 if(nTracklets) mean_ncls /= nTracklets;
41702fec 2911 // The Debug Stream contains the seed
29f95561 2912 TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
41702fec 2913 cstreamer << "CookLikelihood"
2914 << "EventNumber=" << eventNumber
2915 << "CandidateNumber=" << candidateNumber
2916 << "tracklet0.=" << &cseed[0]
2917 << "tracklet1.=" << &cseed[1]
2918 << "tracklet2.=" << &cseed[2]
2919 << "tracklet3.=" << &cseed[3]
2920 << "tracklet4.=" << &cseed[4]
2921 << "tracklet5.=" << &cseed[5]
2922 << "sumda=" << sumda
91834b8d 2923 << "chi2y=" << chi2y
2924 << "chi2z=" << chi2z
41702fec 2925 << "likea=" << likea
2926 << "likechi2y=" << likechi2y
2927 << "likechi2z=" << likechi2z
2928 << "nclusters=" << nclusters
2929 << "likeN=" << likeN
2930 << "like=" << like
91834b8d 2931 << "meanncls=" << mean_ncls
41702fec 2932 << "\n";
2933 }
2934
2935 return like;
e4f2f73d 2936}
2937
e4f2f73d 2938//____________________________________________________________________
0906e73e 2939void AliTRDtrackerV1::GetSeedingConfig(Int_t iconfig, Int_t planes[4])
e4f2f73d 2940{
41702fec 2941 //
2942 // Map seeding configurations to detector planes.
2943 //
2944 // Parameters :
2945 // iconfig : configuration index
2946 // planes : member planes of this configuration. On input empty.
2947 //
2948 // Output :
2949 // planes : contains the planes which are defining the configuration
2950 //
2951 // Detailed description
2952 //
2953 // Here is the list of seeding planes configurations together with
2954 // their topological classification:
2955 //
2956 // 0 - 5432 TQ 0
2957 // 1 - 4321 TQ 0
2958 // 2 - 3210 TQ 0
2959 // 3 - 5321 TQ 1
2960 // 4 - 4210 TQ 1
2961 // 5 - 5431 TQ 1
2962 // 6 - 4320 TQ 1
2963 // 7 - 5430 TQ 2
2964 // 8 - 5210 TQ 2
2965 // 9 - 5421 TQ 3
2966 // 10 - 4310 TQ 3
2967 // 11 - 5410 TQ 4
2968 // 12 - 5420 TQ 5
2969 // 13 - 5320 TQ 5
2970 // 14 - 5310 TQ 5
2971 //
2972 // The topologic quality is modeled as follows:
2973 // 1. The general model is define by the equation:
2974 // p(conf) = exp(-conf/2)
2975 // 2. According to the topologic classification, configurations from the same
2976 // class are assigned the agerage value over the model values.
2977 // 3. Quality values are normalized.
2978 //
2979 // The topologic quality distribution as function of configuration is given below:
2980 //Begin_Html
2981 // <img src="gif/topologicQA.gif">
2982 //End_Html
2983 //
2984
2985 switch(iconfig){
2986 case 0: // 5432 TQ 0
2987 planes[0] = 2;
2988 planes[1] = 3;
2989 planes[2] = 4;
2990 planes[3] = 5;
2991 break;
2992 case 1: // 4321 TQ 0
2993 planes[0] = 1;
2994 planes[1] = 2;
2995 planes[2] = 3;
2996 planes[3] = 4;
2997 break;
2998 case 2: // 3210 TQ 0
2999 planes[0] = 0;
3000 planes[1] = 1;
3001 planes[2] = 2;
3002 planes[3] = 3;
3003 break;
3004 case 3: // 5321 TQ 1
3005 planes[0] = 1;
3006 planes[1] = 2;
3007 planes[2] = 3;
3008 planes[3] = 5;
3009 break;
3010 case 4: // 4210 TQ 1
3011 planes[0] = 0;
3012 planes[1] = 1;
3013 planes[2] = 2;
3014 planes[3] = 4;
3015 break;
3016 case 5: // 5431 TQ 1
3017 planes[0] = 1;
3018 planes[1] = 3;
3019 planes[2] = 4;
3020 planes[3] = 5;
3021 break;
3022 case 6: // 4320 TQ 1
3023 planes[0] = 0;
3024 planes[1] = 2;
3025 planes[2] = 3;
3026 planes[3] = 4;
3027 break;
3028 case 7: // 5430 TQ 2
3029 planes[0] = 0;
3030 planes[1] = 3;
3031 planes[2] = 4;
3032 planes[3] = 5;
3033 break;
3034 case 8: // 5210 TQ 2
3035 planes[0] = 0;
3036 planes[1] = 1;
3037 planes[2] = 2;
3038 planes[3] = 5;
3039 break;
3040 case 9: // 5421 TQ 3
3041 planes[0] = 1;
3042 planes[1] = 2;
3043 planes[2] = 4;
3044 planes[3] = 5;
3045 break;
3046 case 10: // 4310 TQ 3
3047 planes[0] = 0;
3048 planes[1] = 1;
3049 planes[2] = 3;
3050 planes[3] = 4;
3051 break;
3052 case 11: // 5410 TQ 4
3053 planes[0] = 0;
3054 planes[1] = 1;
3055 planes[2] = 4;
3056 planes[3] = 5;
3057 break;
3058 case 12: // 5420 TQ 5
3059 planes[0] = 0;
3060 planes[1] = 2;
3061 planes[2] = 4;
3062 planes[3] = 5;
3063 break;
3064 case 13: // 5320 TQ 5
3065 planes[0] = 0;
3066 planes[1] = 2;
3067 planes[2] = 3;
3068 planes[3] = 5;
3069 break;
3070 case 14: // 5310 TQ 5
3071 planes[0] = 0;
3072 planes[1] = 1;
3073 planes[2] = 3;
3074 planes[3] = 5;
3075 break;
3076 }
e4f2f73d 3077}
3078
3079//____________________________________________________________________
0906e73e 3080void AliTRDtrackerV1::GetExtrapolationConfig(Int_t iconfig, Int_t planes[2])
e4f2f73d 3081{
41702fec 3082 //
3083 // Returns the extrapolation planes for a seeding configuration.
3084 //
3085 // Parameters :
3086 // iconfig : configuration index
3087 // planes : planes which are not in this configuration. On input empty.
3088 //
3089 // Output :
3090 // planes : contains the planes which are not in the configuration
3091 //
3092 // Detailed description
3093 //
3094
3095 switch(iconfig){
3096 case 0: // 5432 TQ 0
3097 planes[0] = 1;
3098 planes[1] = 0;
3099 break;
3100 case 1: // 4321 TQ 0
3101 planes[0] = 5;
3102 planes[1] = 0;
3103 break;
3104 case 2: // 3210 TQ 0
3105 planes[0] = 4;
3106 planes[1] = 5;
3107 break;
3108 case 3: // 5321 TQ 1
3109 planes[0] = 4;
3110 planes[1] = 0;
3111 break;
3112 case 4: // 4210 TQ 1
3113 planes[0] = 5;
3114 planes[1] = 3;
3115 break;
3116 case 5: // 5431 TQ 1
3117 planes[0] = 2;
3118 planes[1] = 0;
3119 break;
3120 case 6: // 4320 TQ 1
3121 planes[0] = 5;
3122 planes[1] = 1;
3123 break;
3124 case 7: // 5430 TQ 2
3125 planes[0] = 2;
3126 planes[1] = 1;
3127 break;
3128 case 8: // 5210 TQ 2
3129 planes[0] = 4;
3130 planes[1] = 3;
3131 break;
3132 case 9: // 5421 TQ 3
3133 planes[0] = 3;
3134 planes[1] = 0;
3135 break;
3136 case 10: // 4310 TQ 3
3137 planes[0] = 5;
3138 planes[1] = 2;
3139 break;
3140 case 11: // 5410 TQ 4
3141 planes[0] = 3;
3142 planes[1] = 2;
3143 break;
3144 case 12: // 5420 TQ 5
3145 planes[0] = 3;
3146 planes[1] = 1;
3147 break;
3148 case 13: // 5320 TQ 5
3149 planes[0] = 4;
3150 planes[1] = 1;
3151 break;
3152 case 14: // 5310 TQ 5
3153 planes[0] = 4;
3154 planes[1] = 2;
3155 break;
3156 }
e4f2f73d 3157}
eb38ed55 3158
3159//____________________________________________________________________
3160AliCluster* AliTRDtrackerV1::GetCluster(Int_t idx) const
3161{
41702fec 3162 Int_t ncls = fClusters->GetEntriesFast();
2f7514a6 3163 return idx >= 0 && idx < ncls ? (AliCluster*)fClusters->UncheckedAt(idx) : 0x0;
eb38ed55 3164}
3165
3b57a3f7 3166//____________________________________________________________________
3167AliTRDseedV1* AliTRDtrackerV1::GetTracklet(Int_t idx) const
3168{
41702fec 3169 Int_t ntrklt = fTracklets->GetEntriesFast();
2f7514a6 3170 return idx >= 0 && idx < ntrklt ? (AliTRDseedV1*)fTracklets->UncheckedAt(idx) : 0x0;
3b57a3f7 3171}
3172
3173//____________________________________________________________________
3174AliKalmanTrack* AliTRDtrackerV1::GetTrack(Int_t idx) const
3175{
41702fec 3176 Int_t ntrk = fTracks->GetEntriesFast();
2f7514a6 3177 return idx >= 0 && idx < ntrk ? (AliKalmanTrack*)fTracks->UncheckedAt(idx) : 0x0;
3b57a3f7 3178}
3179
bb56afff 3180//____________________________________________________________________
3181Float_t AliTRDtrackerV1::CalculateReferenceX(AliTRDseedV1 *tracklets){
41702fec 3182 //
3183 // Calculates the reference x-position for the tilted Rieman fit defined as middle
3184 // of the stack (middle between layers 2 and 3). For the calculation all the tracklets
3185 // are taken into account
3186 //
3187 // Parameters: - Array of tracklets(AliTRDseedV1)
3188 //
3189 // Output: - The reference x-position(Float_t)
3190 //
3191 Int_t nDistances = 0;
3192 Float_t meanDistance = 0.;
3193 Int_t startIndex = 5;
3194 for(Int_t il =5; il > 0; il--){
3195 if(tracklets[il].IsOK() && tracklets[il -1].IsOK()){
3196 Float_t xdiff = tracklets[il].GetX0() - tracklets[il -1].GetX0();
3197 meanDistance += xdiff;
3198 nDistances++;
3199 }
3200 if(tracklets[il].IsOK()) startIndex = il;
3201 }
3202 if(tracklets[0].IsOK()) startIndex = 0;
3203 if(!nDistances){
3204 // We should normally never get here
3205 Float_t xpos[2]; memset(xpos, 0, sizeof(Float_t) * 2);
3206 Int_t iok = 0, idiff = 0;
3207 // This attempt is worse and should be avoided:
3208 // check for two chambers which are OK and repeat this without taking the mean value
3209 // Strategy avoids a division by 0;
3210 for(Int_t il = 5; il >= 0; il--){
3211 if(tracklets[il].IsOK()){
3212 xpos[iok] = tracklets[il].GetX0();
3213 iok++;
3214 startIndex = il;
3215 }
3216 if(iok) idiff++; // to get the right difference;
3217 if(iok > 1) break;
3218 }
3219 if(iok > 1){
3220 meanDistance = (xpos[0] - xpos[1])/idiff;
3221 }
3222 else{
3223 // we have do not even have 2 layers which are OK? The we do not need to fit at all
3224 return 331.;
3225 }
3226 }
3227 else{
3228 meanDistance /= nDistances;
3229 }
3230 return tracklets[startIndex].GetX0() + (2.5 - startIndex) * meanDistance - 0.5 * (AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick());
bb56afff 3231}
eb38ed55 3232
3233//_____________________________________________________________________________
3234Int_t AliTRDtrackerV1::Freq(Int_t n, const Int_t *inlist
41702fec 3235 , Int_t *outlist, Bool_t down)
eb38ed55 3236{
41702fec 3237 //
3238 // Sort eleements according occurancy
3239 // The size of output array has is 2*n
3240 //
3241
3242 if (n <= 0) {
3243 return 0;
3244 }
3245
3246 Int_t *sindexS = new Int_t[n]; // Temporary array for sorting
3247 Int_t *sindexF = new Int_t[2*n];
3248 for (Int_t i = 0; i < n; i++) {
3249 sindexF[i] = 0;
3250 }
3251
3252 TMath::Sort(n,inlist,sindexS,down);
3253
3254 Int_t last = inlist[sindexS[0]];
3255 Int_t val = last;
3256 sindexF[0] = 1;
3257 sindexF[0+n] = last;
3258 Int_t countPos = 0;
3259
3260 // Find frequency
3261 for (Int_t i = 1; i < n; i++) {
3262 val = inlist[sindexS[i]];
3263 if (last == val) {
3264 sindexF[countPos]++;
3265 }
3266 else {
3267 countPos++;
3268 sindexF[countPos+n] = val;
3269 sindexF[countPos]++;
3270 last = val;
3271 }
3272 }
3273 if (last == val) {
3274 countPos++;
3275 }
3276
3277 // Sort according frequency
3278 TMath::Sort(countPos,sindexF,sindexS,kTRUE);
3279
3280 for (Int_t i = 0; i < countPos; i++) {
3281 outlist[2*i ] = sindexF[sindexS[i]+n];
3282 outlist[2*i+1] = sindexF[sindexS[i]];
3283 }
3284
3285 delete [] sindexS;
3286 delete [] sindexF;
3287
3288 return countPos;
eb38ed55 3289
3290}
bb56afff 3291
06b32d95 3292
d611c74f 3293//____________________________________________________________________
3294void AliTRDtrackerV1::ResetSeedTB()
3295{
3296// reset buffer for seeding time bin layers. If the time bin
3297// layers are not allocated this function allocates them
3298
3299 for(Int_t isl=0; isl<kNSeedPlanes; isl++){
3300 if(!fSeedTB[isl]) fSeedTB[isl] = new AliTRDchamberTimeBin();
3301 else fSeedTB[isl]->Clear();
3302 }
3303}
3304
e3cf3d02 3305
3306//_____________________________________________________________________________
3307Float_t AliTRDtrackerV1::GetChi2Y(AliTRDseedV1 *tracklets) const
3308{
3309 // Calculates normalized chi2 in y-direction
3310 // chi2 = Sum chi2 / n_tracklets
3311
3312 Double_t chi2 = 0.; Int_t n = 0;
3313 for(Int_t ipl = kNPlanes; ipl--;){
3314 if(!tracklets[ipl].IsOK()) continue;
3315 chi2 += tracklets[ipl].GetChi2Y();
3316 n++;
3317 }
3318 return n ? chi2/n : 0.;
3319}
3320
bb56afff 3321//_____________________________________________________________________________
3322Float_t AliTRDtrackerV1::GetChi2Z(AliTRDseedV1 *tracklets) const
3323{
91834b8d 3324 // Calculates normalized chi2 in z-direction
e3cf3d02 3325 // chi2 = Sum chi2 / n_tracklets
41702fec 3326
e3cf3d02 3327 Double_t chi2 = 0; Int_t n = 0;
3328 for(Int_t ipl = kNPlanes; ipl--;){
41702fec 3329 if(!tracklets[ipl].IsOK()) continue;
e3cf3d02 3330 chi2 += tracklets[ipl].GetChi2Z();
3331 n++;
41702fec 3332 }
e3cf3d02 3333 return n ? chi2/n : 0.;
bb56afff 3334}
8acca6a3 3335
3336///////////////////////////////////////////////////////
3337// //
3338// Resources of class AliTRDLeastSquare //
3339// //
3340///////////////////////////////////////////////////////
3341
3342//_____________________________________________________________________________
3343AliTRDtrackerV1::AliTRDLeastSquare::AliTRDLeastSquare(){
41702fec 3344 //
3345 // Constructor of the nested class AliTRDtrackFitterLeastSquare
3346 //
3347 memset(fParams, 0, sizeof(Double_t) * 2);
3348 memset(fSums, 0, sizeof(Double_t) * 5);
3349 memset(fCovarianceMatrix, 0, sizeof(Double_t) * 3);
8acca6a3 3350
3351}
3352
3353//_____________________________________________________________________________
3354void AliTRDtrackerV1::AliTRDLeastSquare::AddPoint(Double_t *x, Double_t y, Double_t sigmaY){
41702fec 3355 //
3356 // Adding Point to the fitter
3357 //
3358 Double_t weight = 1/(sigmaY * sigmaY);
3359 Double_t &xpt = *x;
3360 // printf("Adding point x = %f, y = %f, sigma = %f\n", xpt, y, sigmaY);
3361 fSums[0] += weight;
3362 fSums[1] += weight * xpt;
3363 fSums[2] += weight * y;
3364 fSums[3] += weight * xpt * y;
3365 fSums[4] += weight * xpt * xpt;
3366 fSums[5] += weight * y * y;
8acca6a3 3367}
3368
3369//_____________________________________________________________________________
3370void AliTRDtrackerV1::AliTRDLeastSquare::RemovePoint(Double_t *x, Double_t y, Double_t sigmaY){
41702fec 3371 //
3372 // Remove Point from the sample
3373 //
3374 Double_t weight = 1/(sigmaY * sigmaY);
3375 Double_t &xpt = *x;
3376 fSums[0] -= weight;
3377 fSums[1] -= weight * xpt;
3378 fSums[2] -= weight * y;
3379 fSums[3] -= weight * xpt * y;
3380 fSums[4] -= weight * xpt * xpt;
3381 fSums[5] -= weight * y * y;
8acca6a3 3382}
3383
3384//_____________________________________________________________________________
3385void AliTRDtrackerV1::AliTRDLeastSquare::Eval(){
41702fec 3386 //
3387 // Evaluation of the fit:
3388 // Calculation of the parameters
3389 // Calculation of the covariance matrix
3390 //
3391
3392 Double_t denominator = fSums[0] * fSums[4] - fSums[1] *fSums[1];
aec26713 3393 if(denominator==0) return;
3394
41702fec 3395 // for(Int_t isum = 0; isum < 5; isum++)
3396 // printf("fSums[%d] = %f\n", isum, fSums[isum]);