When calculating a*a-b*b the form (a-b)*(a+b) is usually more numerically stable.
[u/mrichter/AliRoot.git] / TRD / AliTRDtrackerV1.cxx
CommitLineData
e4f2f73d 1/**************************************************************************
972ef65e 2* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
3* *
4* Author: The ALICE Off-line Project. *
5* Contributors are mentioned in the code where appropriate. *
6* *
7* Permission to use, copy, modify and distribute this software and its *
8* documentation strictly for non-commercial purposes is hereby granted *
9* without fee, provided that the above copyright notice appears in all *
10* copies and that both the copyright notice and this permission notice *
11* appear in the supporting documentation. The authors make no claims *
12* about the suitability of this software for any purpose. It is *
13* provided "as is" without express or implied warranty. *
14**************************************************************************/
e4f2f73d 15
16/* $Id$ */
17
18///////////////////////////////////////////////////////////////////////////////
19// //
20// Track finder //
21// //
22// Authors: //
23// Alex Bercuci <A.Bercuci@gsi.de> //
24// Markus Fasel <M.Fasel@gsi.de> //
25// //
26///////////////////////////////////////////////////////////////////////////////
27
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)) {
41702fec 317 //
318 // Make backup for back propagation
319 //
320 Int_t foundClr = track.GetNumberOfClusters();
321 if (foundClr >= foundMin) {
322 //AliInfo(Form("Making backup track ncls [%d]...", foundClr));
323 //track.CookdEdx();
324 //track.CookdEdxTimBin(seed->GetID());
325 track.CookLabel(1. - fgkLabelFraction);
326 if(track.GetBackupTrack()) UseClusters(track.GetBackupTrack());
41702fec 327
328 // Sign only gold tracks
329 if (track.GetChi2() / track.GetNumberOfClusters() < 4) {
76b60503 330 if ((seed->GetKinkIndex(0) == 0) && (track.Pt() < 1.5)){
331 //UseClusters(&track);
332 }
41702fec 333 }
334 Bool_t isGold = kFALSE;
335
336 // Full gold track
337 if (track.GetChi2() / track.GetNumberOfClusters() < 5) {
338 if (track.GetBackupTrack()) seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup);
339
340 isGold = kTRUE;
341 }
342
343 // Almost gold track
344 if ((!isGold) && (track.GetNCross() == 0) && (track.GetChi2() / track.GetNumberOfClusters() < 7)) {
345 //seed->UpdateTrackParams(track, AliESDtrack::kTRDbackup);
346 if (track.GetBackupTrack()) seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup);
347
348 isGold = kTRUE;
349 }
350
351 if ((!isGold) && (track.GetBackupTrack())) {
352 if ((track.GetBackupTrack()->GetNumberOfClusters() > foundMin) && ((track.GetBackupTrack()->GetChi2()/(track.GetBackupTrack()->GetNumberOfClusters()+1)) < 7)) {
353 seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup);
354 isGold = kTRUE;
355 }
356 }
357
358 //if ((track->StatusForTOF() > 0) && (track->GetNCross() == 0) && (Float_t(track->GetNumberOfClusters()) / Float_t(track->GetNExpected()) > 0.4)) {
359 //seed->UpdateTrackParams(track->GetBackupTrack(), AliESDtrack::kTRDbackup);
360 //}
361 }
362 }
363
364 // Propagation to the TOF (I.Belikov)
365 if (track.IsStopped() == kFALSE) {
366 Double_t xtof = 371.0;
367 Double_t xTOF0 = 370.0;
368
27fbeba8 369 Double_t c2 = track.GetSnp() + track.GetC(track.GetBz()) * (xtof - track.GetX());
41702fec 370 if (TMath::Abs(c2) >= 0.99) continue;
371
ae3fbe1f 372 if (!PropagateToX(track, xTOF0, fgkMaxStep)) continue;
41702fec 373
374 // Energy losses taken to the account - check one more time
27fbeba8 375 c2 = track.GetSnp() + track.GetC(track.GetBz()) * (xtof - track.GetX());
41702fec 376 if (TMath::Abs(c2) >= 0.99) continue;
377
378 //if (!PropagateToX(*track,xTOF0,fgkMaxStep)) {
379 // fHBackfit->Fill(7);
380 //delete track;
381 // continue;
382 //}
383
384 Double_t ymax = xtof * TMath::Tan(0.5 * AliTRDgeometry::GetAlpha());
385 Double_t y;
386 track.GetYAt(xtof,GetBz(),y);
387 if (y > ymax) {
388 if (!track.Rotate( AliTRDgeometry::GetAlpha())) continue;
389 }else if (y < -ymax) {
390 if (!track.Rotate(-AliTRDgeometry::GetAlpha())) continue;
391 }
392
393 if (track.PropagateTo(xtof)) {
394 seed->UpdateTrackParams(&track, AliESDtrack::kTRDout);
395 track.UpdateESDtrack(seed);
41702fec 396 }
397 } else {
398 if ((track.GetNumberOfClusters() > 15) && (track.GetNumberOfClusters() > 0.5*expectedClr)) {
399 seed->UpdateTrackParams(&track, AliESDtrack::kTRDout);
400
401 track.UpdateESDtrack(seed);
41702fec 402 }
403 }
404
405 seed->SetTRDQuality(track.StatusForTOF());
406 seed->SetTRDBudget(track.GetBudget(0));
407 }
d611c74f 408 if(index) delete [] index;
409 if(quality) delete [] quality;
41702fec 410
411
412 AliInfo(Form("Number of seeds: %d", nSeed));
413 AliInfo(Form("Number of back propagated TRD tracks: %d", found));
414
d611c74f 415 // run stand alone tracking
3a039a31 416 if (fReconstructor->IsSeeding()) Clusters2Tracks(event);
41702fec 417
418 return 0;
0906e73e 419}
420
421
422//____________________________________________________________________
423Int_t AliTRDtrackerV1::RefitInward(AliESDEvent *event)
424{
41702fec 425 //
426 // Refits tracks within the TRD. The ESD event is expected to contain seeds
427 // at the outer part of the TRD.
428 // The tracks are propagated to the innermost time bin
429 // of the TRD and the ESD event is updated
430 // Origin: Thomas KUHR (Thomas.Kuhr@cern.ch)
431 //
432
433 Int_t nseed = 0; // contor for loaded seeds
434 Int_t found = 0; // contor for updated TRD tracks
435
436
437 AliTRDtrackV1 track;
438 for (Int_t itrack = 0; itrack < event->GetNumberOfTracks(); itrack++) {
439 AliESDtrack *seed = event->GetTrack(itrack);
440 new(&track) AliTRDtrackV1(*seed);
441
442 if (track.GetX() < 270.0) {
443 seed->UpdateTrackParams(&track, AliESDtrack::kTRDbackup);
444 continue;
445 }
446
447 ULong_t status = seed->GetStatus();
e4d4864b 448 // reject tracks which failed propagation in the TRD
41702fec 449 if((status & AliESDtrack::kTRDout) == 0) continue;
e4d4864b 450
451 // reject tracks which are produced by the TRD stand alone track finder.
452 if((status & AliESDtrack::kTRDin) == 0) continue;
41702fec 453 nseed++;
454
455 track.ResetCovariance(50.0);
456
457 // do the propagation and processing
458 Bool_t kUPDATE = kFALSE;
459 Double_t xTPC = 250.0;
460 if(FollowProlongation(track)){
461 // Prolongate to TPC
462 if (PropagateToX(track, xTPC, fgkMaxStep)) { // -with update
463 seed->UpdateTrackParams(&track, AliESDtrack::kTRDrefit);
464 found++;
465 kUPDATE = kTRUE;
466 }
467 }
468
469 // Prolongate to TPC without update
470 if(!kUPDATE) {
471 AliTRDtrackV1 tt(*seed);
472 if (PropagateToX(tt, xTPC, fgkMaxStep)) seed->UpdateTrackParams(&tt, AliESDtrack::kTRDrefit);
473 }
474 }
475 AliInfo(Form("Number of loaded seeds: %d",nseed));
476 AliInfo(Form("Number of found tracks from loaded seeds: %d",found));
477
478 return 0;
0906e73e 479}
480
0906e73e 481//____________________________________________________________________
482Int_t AliTRDtrackerV1::FollowProlongation(AliTRDtrackV1 &t)
483{
41702fec 484 // Extrapolates the TRD track in the TPC direction.
485 //
486 // Parameters
487 // t : the TRD track which has to be extrapolated
488 //
489 // Output
490 // number of clusters attached to the track
491 //
492 // Detailed description
493 //
494 // Starting from current radial position of track <t> this function
495 // extrapolates the track through the 6 TRD layers. The following steps
496 // are being performed for each plane:
497 // 1. prepare track:
498 // a. get plane limits in the local x direction
499 // b. check crossing sectors
500 // c. check track inclination
501 // 2. search tracklet in the tracker list (see GetTracklet() for details)
502 // 3. evaluate material budget using the geo manager
503 // 4. propagate and update track using the tracklet information.
504 //
505 // Debug level 2
506 //
507
508 Int_t nClustersExpected = 0;
509 Int_t lastplane = 5; //GetLastPlane(&t);
510 for (Int_t iplane = lastplane; iplane >= 0; iplane--) {
511 Int_t index = 0;
512 AliTRDseedV1 *tracklet = GetTracklet(&t, iplane, index);
513 if(!tracklet) continue;
514 if(!tracklet->IsOK()) AliWarning("tracklet not OK");
515
9c87a076 516 Double_t x = tracklet->GetXref();//GetX0();
41702fec 517 // reject tracklets which are not considered for inward refit
518 if(x > t.GetX()+fgkMaxStep) continue;
519
520 // append tracklet to track
521 t.SetTracklet(tracklet, index);
522
523 if (x < (t.GetX()-fgkMaxStep) && !PropagateToX(t, x+fgkMaxStep, fgkMaxStep)) break;
524 if (!AdjustSector(&t)) break;
525
526 // Start global position
527 Double_t xyz0[3];
528 t.GetXYZ(xyz0);
529
530 // End global position
531 Double_t alpha = t.GetAlpha(), y, z;
532 if (!t.GetProlongation(x,y,z)) break;
533 Double_t xyz1[3];
534 xyz1[0] = x * TMath::Cos(alpha) - y * TMath::Sin(alpha);
535 xyz1[1] = x * TMath::Sin(alpha) + y * TMath::Cos(alpha);
536 xyz1[2] = z;
537
51a23065 538 Double_t length = TMath::Sqrt(
539 (xyz0[0]-xyz1[0])*(xyz0[0]-xyz1[0]) +
540 (xyz0[1]-xyz1[1])*(xyz0[1]-xyz1[1]) +
541 (xyz0[2]-xyz1[2])*(xyz0[2]-xyz1[2])
542 );
543 if(length>0.){
544 // Get material budget
545 Double_t param[7];
546 if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param)<=0.) break;
547 Double_t xrho= param[0]*param[4];
548 Double_t xx0 = param[1]; // Get mean propagation parameters
549
550 // Propagate and update
551 t.PropagateTo(x, xx0, xrho);
552 if (!AdjustSector(&t)) break;
553 }
41702fec 554
555 Double_t maxChi2 = t.GetPredictedChi2(tracklet);
556 if (maxChi2 < 1e+10 && t.Update(tracklet, maxChi2)){
557 nClustersExpected += tracklet->GetN();
558 }
559 }
560
3a039a31 561 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){
41702fec 562 Int_t index;
51a23065 563 for(int iplane=0; iplane<AliTRDgeometry::kNlayer; iplane++){
41702fec 564 AliTRDseedV1 *tracklet = GetTracklet(&t, iplane, index);
565 if(!tracklet) continue;
566 t.SetTracklet(tracklet, index);
567 }
568
569 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
29f95561 570 TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
41702fec 571 cstreamer << "FollowProlongation"
572 << "EventNumber=" << eventNumber
573 << "ncl=" << nClustersExpected
574 //<< "track.=" << &t
575 << "\n";
576 }
577
578 return nClustersExpected;
0906e73e 579
580}
581
582//_____________________________________________________________________________
583Int_t AliTRDtrackerV1::FollowBackProlongation(AliTRDtrackV1 &t)
584{
41702fec 585 // Extrapolates the TRD track in the TOF direction.
586 //
587 // Parameters
588 // t : the TRD track which has to be extrapolated
589 //
590 // Output
591 // number of clusters attached to the track
592 //
593 // Detailed description
594 //
595 // Starting from current radial position of track <t> this function
596 // extrapolates the track through the 6 TRD layers. The following steps
597 // are being performed for each plane:
598 // 1. prepare track:
599 // a. get plane limits in the local x direction
600 // b. check crossing sectors
601 // c. check track inclination
602 // 2. build tracklet (see AliTRDseed::AttachClusters() for details)
603 // 3. evaluate material budget using the geo manager
604 // 4. propagate and update track using the tracklet information.
605 //
606 // Debug level 2
607 //
608
609 Int_t nClustersExpected = 0;
b1957d3c 610 Double_t clength = .5*AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick();
41702fec 611 AliTRDtrackingChamber *chamber = 0x0;
612
3b57a3f7 613 AliTRDseedV1 tracklet, *ptrTracklet = 0x0;
181d2c97 614 // in case of stand alone tracking we store all the pointers to the tracklets in a temporary array
615 AliTRDseedV1 *tracklets[kNPlanes];
616 memset(tracklets, 0, sizeof(AliTRDseedV1 *) * kNPlanes);
617 for(Int_t ip = 0; ip < kNPlanes; ip++){
618 tracklets[ip] = t.GetTracklet(ip);
619 t.UnsetTracklet(ip);
620 }
3b57a3f7 621
053767a4 622 // Loop through the TRD layers
623 for (Int_t ilayer = 0; ilayer < AliTRDgeometry::Nlayer(); ilayer++) {
41702fec 624 // BUILD TRACKLET IF NOT ALREADY BUILT
b1957d3c 625 Double_t x = 0., x0, y, z, alpha;
181d2c97 626 ptrTracklet = tracklets[ilayer];
41702fec 627 if(!ptrTracklet){
053767a4 628 ptrTracklet = new(&tracklet) AliTRDseedV1(ilayer);
43d6ad34 629 ptrTracklet->SetReconstructor(fReconstructor);
41702fec 630 alpha = t.GetAlpha();
053767a4 631 Int_t sector = Int_t(alpha/AliTRDgeometry::GetAlpha() + (alpha>0. ? 0 : AliTRDgeometry::kNsector));
41702fec 632
633 if(!fTrSec[sector].GetNChambers()) continue;
634
053767a4 635 if((x = fTrSec[sector].GetX(ilayer)) < 1.) continue;
41702fec 636
b1957d3c 637 // Propagate closer to the current layer
638 x0 = x - 1.5*clength;
639 if (x0 > (fgkMaxStep + t.GetX()) && !PropagateToX(t, x0-fgkMaxStep, fgkMaxStep)) return -1/*nClustersExpected*/;
640 if (!AdjustSector(&t)) return -1/*nClustersExpected*/;
641 if (TMath::Abs(t.GetSnp()) > fgkMaxSnp) return -1/*nClustersExpected*/;
642
35c24814 643 if (!t.GetProlongation(x, y, z)) return -1/*nClustersExpected*/;
053767a4 644 Int_t stack = fGeom->GetStack(z, ilayer);
41702fec 645 Int_t nCandidates = stack >= 0 ? 1 : 2;
646 z -= stack >= 0 ? 0. : 4.;
647
648 for(int icham=0; icham<nCandidates; icham++, z+=8){
053767a4 649 if((stack = fGeom->GetStack(z, ilayer)) < 0) continue;
41702fec 650
053767a4 651 if(!(chamber = fTrSec[sector].GetChamber(stack, ilayer))) continue;
41702fec 652
3a039a31 653 if(chamber->GetNClusters() < fgNTimeBins*fReconstructor->GetRecoParam() ->GetFindableClusters()) continue;
41702fec 654
655 x = chamber->GetX();
656
053767a4 657 AliTRDpadPlane *pp = fGeom->GetPadPlane(ilayer, stack);
aec26713 658 tracklet.SetTilt(TMath::Tan(TMath::DegToRad()*pp->GetTiltingAngle()));
41702fec 659 tracklet.SetPadLength(pp->GetLengthIPad());
ae4e8b84 660 tracklet.SetDetector(chamber->GetDetector());
41702fec 661 tracklet.SetX0(x);
b1957d3c 662 tracklet.UpDate(&t);
663// if(!tracklet.Init(&t)){
664// t.SetStopped(kTRUE);
665// return nClustersExpected;
666// }
667 if(!tracklet.AttachClusters(chamber, kTRUE)) continue;
668 //if(!tracklet.AttachClustersIter(chamber, 1000.)) continue;
669 //tracklet.Init(&t);
41702fec 670
3a039a31 671 if(tracklet.GetN() < fgNTimeBins*fReconstructor->GetRecoParam() ->GetFindableClusters()) continue;
41702fec 672
673 break;
674 }
76b60503 675 //ptrTracklet->UseClusters();
b1957d3c 676 }// else ptrTracklet->Init(&t);
41702fec 677 if(!ptrTracklet->IsOK()){
678 if(x < 1.) continue; //temporary
35c24814 679 if(!PropagateToX(t, x-fgkMaxStep, fgkMaxStep)) return -1/*nClustersExpected*/;
680 if(!AdjustSector(&t)) return -1/*nClustersExpected*/;
681 if(TMath::Abs(t.GetSnp()) > fgkMaxSnp) return -1/*nClustersExpected*/;
41702fec 682 continue;
683 }
684
685 // Propagate closer to the current chamber if neccessary
686 x -= clength;
35c24814 687 if (x > (fgkMaxStep + t.GetX()) && !PropagateToX(t, x-fgkMaxStep, fgkMaxStep)) return -1/*nClustersExpected*/;
688 if (!AdjustSector(&t)) return -1/*nClustersExpected*/;
689 if (TMath::Abs(t.GetSnp()) > fgkMaxSnp) return -1/*nClustersExpected*/;
41702fec 690
691 // load tracklet to the tracker and the track
b1957d3c 692 ptrTracklet->Fit(kFALSE); // no tilt correction
41702fec 693 ptrTracklet = SetTracklet(ptrTracklet);
694 t.SetTracklet(ptrTracklet, fTracklets->GetEntriesFast()-1);
695
696
697 // Calculate the mean material budget along the path inside the chamber
698 //Calculate global entry and exit positions of the track in chamber (only track prolongation)
699 Double_t xyz0[3]; // entry point
700 t.GetXYZ(xyz0);
701 alpha = t.GetAlpha();
b1957d3c 702 x = ptrTracklet->GetXref(); //GetX0();
35c24814 703 if (!t.GetProlongation(x, y, z)) return -1/*nClustersExpected*/;
41702fec 704 Double_t xyz1[3]; // exit point
705 xyz1[0] = x * TMath::Cos(alpha) - y * TMath::Sin(alpha);
706 xyz1[1] = +x * TMath::Sin(alpha) + y * TMath::Cos(alpha);
707 xyz1[2] = z;
708 Double_t param[7];
83dea92e 709 if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param)<=0.) return -1;
41702fec 710 // The mean propagation parameters
711 Double_t xrho = param[0]*param[4]; // density*length
712 Double_t xx0 = param[1]; // radiation length
713
714 // Propagate and update track
35c24814 715 if (!t.PropagateTo(x, xx0, xrho)) return -1/*nClustersExpected*/;
716 if (!AdjustSector(&t)) return -1/*nClustersExpected*/;
41702fec 717 Double_t maxChi2 = t.GetPredictedChi2(ptrTracklet);
35c24814 718 if (!t.Update(ptrTracklet, maxChi2)) return -1/*nClustersExpected*/;
b1957d3c 719 ptrTracklet->UpDate(&t);
720
ae3fbe1f 721 if (maxChi2<1e+10) {
41702fec 722 nClustersExpected += ptrTracklet->GetN();
723 //t.SetTracklet(&tracklet, index);
724 }
725 // Reset material budget if 2 consecutive gold
053767a4 726 if(ilayer>0 && t.GetTracklet(ilayer-1) && ptrTracklet->GetN() + t.GetTracklet(ilayer-1)->GetN() > 20) t.SetBudget(2, 0.);
41702fec 727
728 // Make backup of the track until is gold
729 // TO DO update quality check of the track.
730 // consider comparison with fTimeBinsRange
731 Float_t ratio0 = ptrTracklet->GetN() / Float_t(fgNTimeBins);
732 //Float_t ratio1 = Float_t(t.GetNumberOfClusters()+1) / Float_t(t.GetNExpected()+1);
733 //printf("tracklet.GetChi2() %f [< 18.0]\n", tracklet.GetChi2());
734 //printf("ratio0 %f [> 0.8]\n", ratio0);
735 //printf("ratio1 %f [> 0.6]\n", ratio1);
736 //printf("ratio0+ratio1 %f [> 1.5]\n", ratio0+ratio1);
737 //printf("t.GetNCross() %d [== 0]\n", t.GetNCross());
738 //printf("TMath::Abs(t.GetSnp()) %f [< 0.85]\n", TMath::Abs(t.GetSnp()));
739 //printf("t.GetNumberOfClusters() %d [> 20]\n", t.GetNumberOfClusters());
740
741 if (//(tracklet.GetChi2() < 18.0) && TO DO check with FindClusters and move it to AliTRDseed::Update
742 (ratio0 > 0.8) &&
743 //(ratio1 > 0.6) &&
744 //(ratio0+ratio1 > 1.5) &&
745 (t.GetNCross() == 0) &&
746 (TMath::Abs(t.GetSnp()) < 0.85) &&
747 (t.GetNumberOfClusters() > 20)) t.MakeBackupTrack();
748
053767a4 749 } // end layers loop
41702fec 750
3a039a31 751 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){
29f95561 752 TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
41702fec 753 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
754 //AliTRDtrackV1 *debugTrack = new AliTRDtrackV1(t);
755 //debugTrack->SetOwner();
756 cstreamer << "FollowBackProlongation"
757 << "EventNumber=" << eventNumber
758 << "ncl=" << nClustersExpected
759 //<< "track.=" << debugTrack
760 << "\n";
761 }
762
763 return nClustersExpected;
0906e73e 764}
765
eb38ed55 766//_________________________________________________________________________
767Float_t AliTRDtrackerV1::FitRieman(AliTRDseedV1 *tracklets, Double_t *chi2, Int_t *planes){
41702fec 768 //
769 // Fits a Riemann-circle to the given points without tilting pad correction.
770 // The fit is performed using an instance of the class AliRieman (equations
771 // and transformations see documentation of this class)
772 // Afterwards all the tracklets are Updated
773 //
774 // Parameters: - Array of tracklets (AliTRDseedV1)
775 // - Storage for the chi2 values (beginning with direction z)
776 // - Seeding configuration
777 // Output: - The curvature
778 //
779 AliRieman *fitter = AliTRDtrackerV1::GetRiemanFitter();
780 fitter->Reset();
781 Int_t allplanes[] = {0, 1, 2, 3, 4, 5};
782 Int_t *ppl = &allplanes[0];
783 Int_t maxLayers = 6;
784 if(planes){
785 maxLayers = 4;
786 ppl = planes;
787 }
788 for(Int_t il = 0; il < maxLayers; il++){
789 if(!tracklets[ppl[il]].IsOK()) continue;
790 fitter->AddPoint(tracklets[ppl[il]].GetX0(), tracklets[ppl[il]].GetYfitR(0), tracklets[ppl[il]].GetZProb(),1,10);
791 }
792 fitter->Update();
793 // Set the reference position of the fit and calculate the chi2 values
794 memset(chi2, 0, sizeof(Double_t) * 2);
795 for(Int_t il = 0; il < maxLayers; il++){
796 // Reference positions
797 tracklets[ppl[il]].Init(fitter);
798
799 // chi2
800 if((!tracklets[ppl[il]].IsOK()) && (!planes)) continue;
801 chi2[0] += tracklets[ppl[il]].GetChi2Y();
802 chi2[1] += tracklets[ppl[il]].GetChi2Z();
803 }
804 return fitter->GetC();
eb38ed55 805}
806
807//_________________________________________________________________________
808void AliTRDtrackerV1::FitRieman(AliTRDcluster **seedcl, Double_t chi2[2])
809{
41702fec 810 //
811 // Performs a Riemann helix fit using the seedclusters as spacepoints
812 // Afterwards the chi2 values are calculated and the seeds are updated
813 //
814 // Parameters: - The four seedclusters
815 // - The tracklet array (AliTRDseedV1)
816 // - The seeding configuration
817 // - Chi2 array
818 //
819 // debug level 2
820 //
821 AliRieman *fitter = AliTRDtrackerV1::GetRiemanFitter();
822 fitter->Reset();
823 for(Int_t i = 0; i < 4; i++)
824 fitter->AddPoint(seedcl[i]->GetX(), seedcl[i]->GetY(), seedcl[i]->GetZ(), 1, 10);
825 fitter->Update();
826
827
828 // Update the seed and calculated the chi2 value
829 chi2[0] = 0; chi2[1] = 0;
830 for(Int_t ipl = 0; ipl < kNSeedPlanes; ipl++){
831 // chi2
832 chi2[0] += (seedcl[ipl]->GetZ() - fitter->GetZat(seedcl[ipl]->GetX())) * (seedcl[ipl]->GetZ() - fitter->GetZat(seedcl[ipl]->GetX()));
833 chi2[1] += (seedcl[ipl]->GetY() - fitter->GetYat(seedcl[ipl]->GetX())) * (seedcl[ipl]->GetY() - fitter->GetYat(seedcl[ipl]->GetX()));
834 }
eb38ed55 835}
836
837
838//_________________________________________________________________________
839Float_t AliTRDtrackerV1::FitTiltedRiemanConstraint(AliTRDseedV1 *tracklets, Double_t zVertex)
840{
41702fec 841 //
842 // Fits a helix to the clusters. Pad tilting is considered. As constraint it is
843 // assumed that the vertex position is set to 0.
844 // This method is very usefull for high-pt particles
845 // Basis for the fit: (x - x0)^2 + (y - y0)^2 - R^2 = 0
846 // x0, y0: Center of the circle
847 // Measured y-position: ymeas = y - tan(phiT)(zc - zt)
848 // zc: center of the pad row
849 // Equation which has to be fitted (after transformation):
850 // a + b * u + e * v + 2*(ymeas + tan(phiT)(z - zVertex))*t = 0
851 // Transformation:
852 // t = 1/(x^2 + y^2)
853 // u = 2 * x * t
854 // v = 2 * x * tan(phiT) * t
855 // Parameters in the equation:
856 // a = -1/y0, b = x0/y0, e = dz/dx
857 //
858 // The Curvature is calculated by the following equation:
859 // - curv = a/Sqrt(b^2 + 1) = 1/R
860 // Parameters: - the 6 tracklets
861 // - the Vertex constraint
862 // Output: - the Chi2 value of the track
863 //
864 // debug level 5
865 //
866
867 TLinearFitter *fitter = GetTiltedRiemanFitterConstraint();
868 fitter->StoreData(kTRUE);
869 fitter->ClearPoints();
870 AliTRDcluster *cl = 0x0;
871
872 Float_t x, y, z, w, t, error, tilt;
873 Double_t uvt[2];
874 Int_t nPoints = 0;
053767a4 875 for(Int_t ilr = 0; ilr < AliTRDgeometry::kNlayer; ilr++){
876 if(!tracklets[ilr].IsOK()) continue;
41702fec 877 for(Int_t itb = 0; itb < fgNTimeBins; itb++){
053767a4 878 if(!tracklets[ilr].IsUsable(itb)) continue;
879 cl = tracklets[ilr].GetClusters(itb);
41702fec 880 x = cl->GetX();
881 y = cl->GetY();
882 z = cl->GetZ();
053767a4 883 tilt = tracklets[ilr].GetTilt();
41702fec 884 // Transformation
885 t = 1./(x * x + y * y);
886 uvt[0] = 2. * x * t;
887 uvt[1] = 2. * x * t * tilt ;
888 w = 2. * (y + tilt * (z - zVertex)) * t;
889 error = 2. * 0.2 * t;
890 fitter->AddPoint(uvt, w, error);
891 nPoints++;
892 }
893 }
894 fitter->Eval();
895
896 // Calculate curvature
897 Double_t a = fitter->GetParameter(0);
898 Double_t b = fitter->GetParameter(1);
899 Double_t curvature = a/TMath::Sqrt(b*b + 1);
900
901 Float_t chi2track = fitter->GetChisquare()/Double_t(nPoints);
902 for(Int_t ip = 0; ip < AliTRDtrackerV1::kNPlanes; ip++)
903 tracklets[ip].SetCC(curvature);
904
3a039a31 905/* if(fReconstructor->GetStreamLevel() >= 5){
41702fec 906 //Linear Model on z-direction
907 Double_t xref = CalculateReferenceX(tracklets); // Relative to the middle of the stack
908 Double_t slope = fitter->GetParameter(2);
909 Double_t zref = slope * xref;
910 Float_t chi2Z = CalculateChi2Z(tracklets, zref, slope, xref);
911 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
912 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
29f95561 913 TTreeSRedirector &treeStreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
41702fec 914 treeStreamer << "FitTiltedRiemanConstraint"
915 << "EventNumber=" << eventNumber
916 << "CandidateNumber=" << candidateNumber
917 << "Curvature=" << curvature
918 << "Chi2Track=" << chi2track
919 << "Chi2Z=" << chi2Z
920 << "zref=" << zref
921 << "\n";
3a039a31 922 }*/
41702fec 923 return chi2track;
eb38ed55 924}
925
926//_________________________________________________________________________
927Float_t AliTRDtrackerV1::FitTiltedRieman(AliTRDseedV1 *tracklets, Bool_t sigError)
928{
41702fec 929 //
930 // Performs a Riemann fit taking tilting pad correction into account
931 // The equation of a Riemann circle, where the y position is substituted by the
932 // measured y-position taking pad tilting into account, has to be transformed
933 // into a 4-dimensional hyperplane equation
934 // Riemann circle: (x-x0)^2 + (y-y0)^2 -R^2 = 0
935 // Measured y-Position: ymeas = y - tan(phiT)(zc - zt)
936 // zc: center of the pad row
937 // zt: z-position of the track
938 // The z-position of the track is assumed to be linear dependent on the x-position
939 // Transformed equation: a + b * u + c * t + d * v + e * w - 2 * (ymeas + tan(phiT) * zc) * t = 0
940 // Transformation: u = 2 * x * t
941 // v = 2 * tan(phiT) * t
942 // w = 2 * tan(phiT) * (x - xref) * t
943 // t = 1 / (x^2 + ymeas^2)
944 // Parameters: a = -1/y0
945 // b = x0/y0
946 // c = (R^2 -x0^2 - y0^2)/y0
947 // d = offset
948 // e = dz/dx
949 // If the offset respectively the slope in z-position is impossible, the parameters are fixed using
950 // results from the simple riemann fit. Afterwards the fit is redone.
951 // The curvature is calculated according to the formula:
952 // curv = a/(1 + b^2 + c*a) = 1/R
953 //
954 // Paramters: - Array of tracklets (connected to the track candidate)
955 // - Flag selecting the error definition
956 // Output: - Chi2 values of the track (in Parameter list)
957 //
958 TLinearFitter *fitter = GetTiltedRiemanFitter();
959 fitter->StoreData(kTRUE);
960 fitter->ClearPoints();
961 AliTRDLeastSquare zfitter;
962 AliTRDcluster *cl = 0x0;
963
964 Double_t xref = CalculateReferenceX(tracklets);
965 Double_t x, y, z, t, tilt, dx, w, we;
966 Double_t uvt[4];
967 Int_t nPoints = 0;
968 // Containers for Least-square fitter
969 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
970 if(!tracklets[ipl].IsOK()) continue;
971 for(Int_t itb = 0; itb < fgNTimeBins; itb++){
972 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
973 if (!tracklets[ipl].IsUsable(itb)) continue;
974 x = cl->GetX();
975 y = cl->GetY();
976 z = cl->GetZ();
977 tilt = tracklets[ipl].GetTilt();
978 dx = x - xref;
979 // Transformation
980 t = 1./(x*x + y*y);
981 uvt[0] = 2. * x * t;
982 uvt[1] = t;
983 uvt[2] = 2. * tilt * t;
984 uvt[3] = 2. * tilt * dx * t;
985 w = 2. * (y + tilt*z) * t;
986 // error definition changes for the different calls
987 we = 2. * t;
988 we *= sigError ? tracklets[ipl].GetSigmaY() : 0.2;
989 fitter->AddPoint(uvt, w, we);
990 zfitter.AddPoint(&x, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
991 nPoints++;
992 }
993 }
994 fitter->Eval();
995 zfitter.Eval();
996
997 Double_t offset = fitter->GetParameter(3);
998 Double_t slope = fitter->GetParameter(4);
999
1000 // Linear fitter - not possible to make boundaries
1001 // Do not accept non possible z and dzdx combinations
1002 Bool_t acceptablez = kTRUE;
1003 Double_t zref = 0.0;
1004 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
1005 if(!tracklets[iLayer].IsOK()) continue;
1006 zref = offset + slope * (tracklets[iLayer].GetX0() - xref);
1007 if (TMath::Abs(tracklets[iLayer].GetZProb() - zref) > tracklets[iLayer].GetPadLength() * 0.5 + 1.0)
1008 acceptablez = kFALSE;
1009 }
1010 if (!acceptablez) {
1011 Double_t dzmf = zfitter.GetFunctionParameter(1);
1012 Double_t zmf = zfitter.GetFunctionValue(&xref);
1013 fgTiltedRieman->FixParameter(3, zmf);
1014 fgTiltedRieman->FixParameter(4, dzmf);
1015 fitter->Eval();
1016 fitter->ReleaseParameter(3);
1017 fitter->ReleaseParameter(4);
1018 offset = fitter->GetParameter(3);
1019 slope = fitter->GetParameter(4);
1020 }
1021
1022 // Calculate Curvarture
1023 Double_t a = fitter->GetParameter(0);
1024 Double_t b = fitter->GetParameter(1);
1025 Double_t c = fitter->GetParameter(2);
1026 Double_t curvature = 1.0 + b*b - c*a;
1027 if (curvature > 0.0)
1028 curvature = a / TMath::Sqrt(curvature);
1029
1030 Double_t chi2track = fitter->GetChisquare()/Double_t(nPoints);
1031
1032 // Update the tracklets
1033 Double_t dy, dz;
1034 for(Int_t iLayer = 0; iLayer < AliTRDtrackerV1::kNPlanes; iLayer++) {
1035
1036 x = tracklets[iLayer].GetX0();
1037 y = 0;
1038 z = 0;
1039 dy = 0;
1040 dz = 0;
1041
1042 // y: R^2 = (x - x0)^2 + (y - y0)^2
1043 // => y = y0 +/- Sqrt(R^2 - (x - x0)^2)
1044 // R = Sqrt() = 1/Curvature
1045 // => y = y0 +/- Sqrt(1/Curvature^2 - (x - x0)^2)
1046 Double_t res = (x * a + b); // = (x - x0)/y0
1047 res *= res;
1048 res = 1.0 - c * a + b * b - res; // = (R^2 - (x - x0)^2)/y0^2
1049 if (res >= 0) {
1050 res = TMath::Sqrt(res);
1051 y = (1.0 - res) / a;
1052 }
1053
1054 // dy: R^2 = (x - x0)^2 + (y - y0)^2
1055 // => y = +/- Sqrt(R^2 - (x - x0)^2) + y0
1056 // => dy/dx = (x - x0)/Sqrt(R^2 - (x - x0)^2)
1057 // Curvature: cr = 1/R = a/Sqrt(1 + b^2 - c*a)
1058 // => dy/dx = (x - x0)/(1/(cr^2) - (x - x0)^2)
1059 Double_t x0 = -b / a;
1060 if (-c * a + b * b + 1 > 0) {
1061 if (1.0/(curvature * curvature) - (x - x0) * (x - x0) > 0.0) {
1062 Double_t yderiv = (x - x0) / TMath::Sqrt(1.0/(curvature * curvature) - (x - x0) * (x - x0));
1063 if (a < 0) yderiv *= -1.0;
1064 dy = yderiv;
1065 }
1066 }
1067 z = offset + slope * (x - xref);
1068 dz = slope;
1069 tracklets[iLayer].SetYref(0, y);
1070 tracklets[iLayer].SetYref(1, dy);
1071 tracklets[iLayer].SetZref(0, z);
1072 tracklets[iLayer].SetZref(1, dz);
1073 tracklets[iLayer].SetC(curvature);
1074 tracklets[iLayer].SetChi2(chi2track);
1075 }
1076
3a039a31 1077/* if(fReconstructor->GetStreamLevel() >=5){
29f95561 1078 TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
41702fec 1079 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
1080 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
1081 Double_t chi2z = CalculateChi2Z(tracklets, offset, slope, xref);
1082 cstreamer << "FitTiltedRieman0"
1083 << "EventNumber=" << eventNumber
1084 << "CandidateNumber=" << candidateNumber
1085 << "xref=" << xref
1086 << "Chi2Z=" << chi2z
1087 << "\n";
3a039a31 1088 }*/
41702fec 1089 return chi2track;
eb38ed55 1090}
1091
3b57a3f7 1092
9e333711 1093//____________________________________________________________________
6e4d4425 1094Double_t AliTRDtrackerV1::FitLine(const AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t err, Int_t np, AliTrackPoint *points)
9e333711 1095{
1096 AliTRDLeastSquare yfitter, zfitter;
1097 AliTRDcluster *cl = 0x0;
1098
1099 AliTRDseedV1 work[kNPlanes], *tracklet = 0x0;
1100 if(!tracklets){
1101 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1102 if(!(tracklet = track->GetTracklet(ipl))) continue;
1103 if(!tracklet->IsOK()) continue;
1104 new(&work[ipl]) AliTRDseedV1(*tracklet);
1105 }
1106 tracklets = &work[0];
1107 }
1108
1109 Double_t xref = CalculateReferenceX(tracklets);
1110 Double_t x, y, z, dx, ye, yr, tilt;
1111 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1112 if(!tracklets[ipl].IsOK()) continue;
1113 for(Int_t itb = 0; itb < fgNTimeBins; itb++){
1114 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1115 if (!tracklets[ipl].IsUsable(itb)) continue;
1116 x = cl->GetX();
1117 z = cl->GetZ();
1118 dx = x - xref;
1119 zfitter.AddPoint(&dx, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
1120 }
1121 }
1122 zfitter.Eval();
1123 Double_t z0 = zfitter.GetFunctionParameter(0);
1124 Double_t dzdx = zfitter.GetFunctionParameter(1);
1125 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1126 if(!tracklets[ipl].IsOK()) continue;
1127 for(Int_t itb = 0; itb < fgNTimeBins; itb++){
1128 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1129 if (!tracklets[ipl].IsUsable(itb)) continue;
1130 x = cl->GetX();
1131 y = cl->GetY();
1132 z = cl->GetZ();
1133 tilt = tracklets[ipl].GetTilt();
1134 dx = x - xref;
1135 yr = y + tilt*(z - z0 - dzdx*dx);
1136 // error definition changes for the different calls
1137 ye = tilt*TMath::Sqrt(cl->GetSigmaZ2());
1138 ye += err ? tracklets[ipl].GetSigmaY() : 0.2;
1139 yfitter.AddPoint(&dx, yr, ye);
1140 }
1141 }
1142 yfitter.Eval();
1143 Double_t y0 = yfitter.GetFunctionParameter(0);
1144 Double_t dydx = yfitter.GetFunctionParameter(1);
1145 Double_t chi2 = 0.;//yfitter.GetChisquare()/Double_t(nPoints);
1146
1147 //update track points array
1148 if(np && points){
1149 Float_t xyz[3];
1150 for(int ip=0; ip<np; ip++){
1151 points[ip].GetXYZ(xyz);
1152 xyz[1] = y0 + dydx * (xyz[0] - xref);
1153 xyz[2] = z0 + dzdx * (xyz[0] - xref);
1154 points[ip].SetXYZ(xyz);
1155 }
1156 }
1157 return chi2;
1158}
1159
1160
3b57a3f7 1161//_________________________________________________________________________
6e4d4425 1162Double_t AliTRDtrackerV1::FitRiemanTilt(const AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t sigError, Int_t np, AliTrackPoint *points)
3b57a3f7 1163{
41702fec 1164 //
1165 // Performs a Riemann fit taking tilting pad correction into account
1166 // The equation of a Riemann circle, where the y position is substituted by the
1167 // measured y-position taking pad tilting into account, has to be transformed
1168 // into a 4-dimensional hyperplane equation
1169 // Riemann circle: (x-x0)^2 + (y-y0)^2 -R^2 = 0
1170 // Measured y-Position: ymeas = y - tan(phiT)(zc - zt)
1171 // zc: center of the pad row
1172 // zt: z-position of the track
1173 // The z-position of the track is assumed to be linear dependent on the x-position
1174 // Transformed equation: a + b * u + c * t + d * v + e * w - 2 * (ymeas + tan(phiT) * zc) * t = 0
1175 // Transformation: u = 2 * x * t
1176 // v = 2 * tan(phiT) * t
1177 // w = 2 * tan(phiT) * (x - xref) * t
1178 // t = 1 / (x^2 + ymeas^2)
1179 // Parameters: a = -1/y0
1180 // b = x0/y0
1181 // c = (R^2 -x0^2 - y0^2)/y0
1182 // d = offset
1183 // e = dz/dx
1184 // If the offset respectively the slope in z-position is impossible, the parameters are fixed using
1185 // results from the simple riemann fit. Afterwards the fit is redone.
1186 // The curvature is calculated according to the formula:
1187 // curv = a/(1 + b^2 + c*a) = 1/R
1188 //
1189 // Paramters: - Array of tracklets (connected to the track candidate)
1190 // - Flag selecting the error definition
1191 // Output: - Chi2 values of the track (in Parameter list)
1192 //
1193 TLinearFitter *fitter = GetTiltedRiemanFitter();
1194 fitter->StoreData(kTRUE);
1195 fitter->ClearPoints();
1196 AliTRDLeastSquare zfitter;
1197 AliTRDcluster *cl = 0x0;
3b57a3f7 1198
1199 AliTRDseedV1 work[kNPlanes], *tracklet = 0x0;
1200 if(!tracklets){
1201 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1202 if(!(tracklet = track->GetTracklet(ipl))) continue;
1203 if(!tracklet->IsOK()) continue;
1204 new(&work[ipl]) AliTRDseedV1(*tracklet);
1205 }
1206 tracklets = &work[0];
1207 }
1208
41702fec 1209 Double_t xref = CalculateReferenceX(tracklets);
1210 Double_t x, y, z, t, tilt, dx, w, we;
1211 Double_t uvt[4];
1212 Int_t nPoints = 0;
1213 // Containers for Least-square fitter
1214 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1215 if(!tracklets[ipl].IsOK()) continue;
1216 for(Int_t itb = 0; itb < fgNTimeBins; itb++){
1217 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1218 if (!tracklets[ipl].IsUsable(itb)) continue;
1219 x = cl->GetX();
1220 y = cl->GetY();
1221 z = cl->GetZ();
1222 tilt = tracklets[ipl].GetTilt();
1223 dx = x - xref;
1224 // Transformation
1225 t = 1./(x*x + y*y);
1226 uvt[0] = 2. * x * t;
1227 uvt[1] = t;
1228 uvt[2] = 2. * tilt * t;
1229 uvt[3] = 2. * tilt * dx * t;
1230 w = 2. * (y + tilt*z) * t;
1231 // error definition changes for the different calls
1232 we = 2. * t;
1233 we *= sigError ? tracklets[ipl].GetSigmaY() : 0.2;
1234 fitter->AddPoint(uvt, w, we);
1235 zfitter.AddPoint(&x, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
1236 nPoints++;
1237 }
1238 }
aec26713 1239 if(fitter->Eval()) return 1.E10;
1240
41702fec 1241 Double_t z0 = fitter->GetParameter(3);
1242 Double_t dzdx = fitter->GetParameter(4);
3b57a3f7 1243
1244
1245 // Linear fitter - not possible to make boundaries
1246 // Do not accept non possible z and dzdx combinations
1247 Bool_t accept = kTRUE;
1248 Double_t zref = 0.0;
1249 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
1250 if(!tracklets[iLayer].IsOK()) continue;
1251 zref = z0 + dzdx * (tracklets[iLayer].GetX0() - xref);
1252 if (TMath::Abs(tracklets[iLayer].GetZProb() - zref) > tracklets[iLayer].GetPadLength() * 0.5 + 1.0)
1253 accept = kFALSE;
1254 }
1255 if (!accept) {
41702fec 1256 zfitter.Eval();
3b57a3f7 1257 Double_t dzmf = zfitter.GetFunctionParameter(1);
1258 Double_t zmf = zfitter.GetFunctionValue(&xref);
1259 fitter->FixParameter(3, zmf);
1260 fitter->FixParameter(4, dzmf);
1261 fitter->Eval();
1262 fitter->ReleaseParameter(3);
1263 fitter->ReleaseParameter(4);
1264 z0 = fitter->GetParameter(3); // = zmf ?
1265 dzdx = fitter->GetParameter(4); // = dzmf ?
1266 }
1267
1268 // Calculate Curvature
1269 Double_t a = fitter->GetParameter(0);
1270 Double_t b = fitter->GetParameter(1);
1271 Double_t c = fitter->GetParameter(2);
1272 Double_t y0 = 1. / a;
1273 Double_t x0 = -b * y0;
a015e406 1274 Double_t tmp = y0*y0 + x0*x0 - c*y0;
1275 if(tmp<=0.) return 1.E10;
1276 Double_t R = TMath::Sqrt(tmp);
3b57a3f7 1277 Double_t C = 1.0 + b*b - c*a;
1278 if (C > 0.0) C = a / TMath::Sqrt(C);
1279
1280 // Calculate chi2 of the fit
1281 Double_t chi2 = fitter->GetChisquare()/Double_t(nPoints);
1282
1283 // Update the tracklets
1284 if(!track){
1285 for(Int_t ip = 0; ip < kNPlanes; ip++) {
1286 x = tracklets[ip].GetX0();
90cf7133 1287 tmp = R*R-(x-x0)*(x-x0);
a015e406 1288 if(tmp <= 0.) continue;
1289 tmp = TMath::Sqrt(tmp);
3b57a3f7 1290
1291 // y: R^2 = (x - x0)^2 + (y - y0)^2
1292 // => y = y0 +/- Sqrt(R^2 - (x - x0)^2)
1293 tracklets[ip].SetYref(0, y0 - (y0>0.?1.:-1)*tmp);
1294 // => dy/dx = (x - x0)/Sqrt(R^2 - (x - x0)^2)
1295 tracklets[ip].SetYref(1, (x - x0) / tmp);
1296 tracklets[ip].SetZref(0, z0 + dzdx * (x - xref));
1297 tracklets[ip].SetZref(1, dzdx);
1298 tracklets[ip].SetC(C);
1299 tracklets[ip].SetChi2(chi2);
1300 }
1301 }
3b57a3f7 1302 //update track points array
1303 if(np && points){
1304 Float_t xyz[3];
1305 for(int ip=0; ip<np; ip++){
1306 points[ip].GetXYZ(xyz);
60e55aee 1307 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 1308 xyz[2] = z0 + dzdx * (xyz[0] - xref);
1309 points[ip].SetXYZ(xyz);
1310 }
1311 }
1312
3b57a3f7 1313 return chi2;
1314}
1315
1316
1bf51039 1317//____________________________________________________________________
1318Double_t AliTRDtrackerV1::FitKalman(AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t up, Int_t np, AliTrackPoint *points)
1319{
1320// Kalman filter implementation for the TRD.
1321// It returns the positions of the fit in the array "points"
1322//
1323// Author : A.Bercuci@gsi.de
1324
3cfaffa4 1325 // printf("Start track @ x[%f]\n", track->GetX());
1bf51039 1326
1327 //prepare marker points along the track
1328 Int_t ip = np ? 0 : 1;
1329 while(ip<np){
1330 if((up?-1:1) * (track->GetX() - points[ip].GetX()) > 0.) break;
1331 //printf("AliTRDtrackerV1::FitKalman() : Skip track marker x[%d] = %7.3f. Before track start ( %7.3f ).\n", ip, points[ip].GetX(), track->GetX());
1332 ip++;
1333 }
1334 //if(points) printf("First marker point @ x[%d] = %f\n", ip, points[ip].GetX());
1335
1336
1337 AliTRDseedV1 tracklet, *ptrTracklet = 0x0;
1338
1339 //Loop through the TRD planes
1340 for (Int_t jplane = 0; jplane < kNPlanes; jplane++) {
1341 // GET TRACKLET OR BUILT IT
1342 Int_t iplane = up ? jplane : kNPlanes - 1 - jplane;
1343 if(tracklets){
1344 if(!(ptrTracklet = &tracklets[iplane])) continue;
1345 }else{
1346 if(!(ptrTracklet = track->GetTracklet(iplane))){
1347 /*AliTRDtrackerV1 *tracker = 0x0;
1348 if(!(tracker = dynamic_cast<AliTRDtrackerV1*>( AliTRDReconstructor::Tracker()))) continue;
1349 ptrTracklet = new(&tracklet) AliTRDseedV1(iplane);
1350 if(!tracker->MakeTracklet(ptrTracklet, track)) */
1351 continue;
1352 }
1353 }
1354 if(!ptrTracklet->IsOK()) continue;
1355
1356 Double_t x = ptrTracklet->GetX0();
1357
1358 while(ip < np){
1359 //don't do anything if next marker is after next update point.
1360 if((up?-1:1) * (points[ip].GetX() - x) - fgkMaxStep < 0) break;
1bf51039 1361 if(((up?-1:1) * (points[ip].GetX() - track->GetX()) < 0) && !PropagateToX(*track, points[ip].GetX(), fgkMaxStep)) return -1.;
1362
1363 Double_t xyz[3]; // should also get the covariance
3cfaffa4 1364 track->GetXYZ(xyz);
1365 track->Global2LocalPosition(xyz, track->GetAlpha());
1366 points[ip].SetXYZ(xyz[0], xyz[1], xyz[2]);
1bf51039 1367 ip++;
1368 }
3cfaffa4 1369 // printf("plane[%d] tracklet[%p] x[%f]\n", iplane, ptrTracklet, x);
1bf51039 1370
3cfaffa4 1371 // Propagate closer to the next update point
1bf51039 1372 if(((up?-1:1) * (x - track->GetX()) + fgkMaxStep < 0) && !PropagateToX(*track, x + (up?-1:1)*fgkMaxStep, fgkMaxStep)) return -1.;
1373
1374 if(!AdjustSector(track)) return -1;
1375 if(TMath::Abs(track->GetSnp()) > fgkMaxSnp) return -1;
1376
1377 //load tracklet to the tracker and the track
1378/* Int_t index;
1379 if((index = FindTracklet(ptrTracklet)) < 0){
1380 ptrTracklet = SetTracklet(&tracklet);
1381 index = fTracklets->GetEntriesFast()-1;
1382 }
1383 track->SetTracklet(ptrTracklet, index);*/
1384
1385
1386 // register tracklet to track with tracklet creation !!
1387 // PropagateBack : loaded tracklet to the tracker and update index
1388 // RefitInward : update index
1389 // MakeTrack : loaded tracklet to the tracker and update index
1390 if(!tracklets) track->SetTracklet(ptrTracklet, -1);
1391
1392
1393 //Calculate the mean material budget along the path inside the chamber
1394 Double_t xyz0[3]; track->GetXYZ(xyz0);
1395 Double_t alpha = track->GetAlpha();
1396 Double_t xyz1[3], y, z;
1397 if(!track->GetProlongation(x, y, z)) return -1;
1398 xyz1[0] = x * TMath::Cos(alpha) - y * TMath::Sin(alpha);
1399 xyz1[1] = +x * TMath::Sin(alpha) + y * TMath::Cos(alpha);
1400 xyz1[2] = z;
3cfaffa4 1401 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 1402 Double_t param[7];
3cfaffa4 1403 if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param) <=0.) break;
1bf51039 1404 Double_t xrho = param[0]*param[4]; // density*length
1405 Double_t xx0 = param[1]; // radiation length
1406
1407 //Propagate the track
1408 track->PropagateTo(x, xx0, xrho);
1409 if (!AdjustSector(track)) break;
1410
1411 //Update track
1412 Double_t chi2 = track->GetPredictedChi2(ptrTracklet);
1413 if(chi2<1e+10) track->Update(ptrTracklet, chi2);
1bf51039 1414 if(!up) continue;
1415
1416 //Reset material budget if 2 consecutive gold
1417 if(iplane>0 && track->GetTracklet(iplane-1) && ptrTracklet->GetN() + track->GetTracklet(iplane-1)->GetN() > 20) track->SetBudget(2, 0.);
1418 } // end planes loop
1419
1420 // extrapolation
1421 while(ip < np){
1422 if(((up?-1:1) * (points[ip].GetX() - track->GetX()) < 0) && !PropagateToX(*track, points[ip].GetX(), fgkMaxStep)) return -1.;
1423
1424 Double_t xyz[3]; // should also get the covariance
3cfaffa4 1425 track->GetXYZ(xyz);
1426 track->Global2LocalPosition(xyz, track->GetAlpha());
1427 points[ip].SetXYZ(xyz[0], xyz[1], xyz[2]);
1bf51039 1428 ip++;
1429 }
1430
1431 return track->GetChi2();
1432}
3b57a3f7 1433
eb38ed55 1434//_________________________________________________________________________
bb56afff 1435Float_t AliTRDtrackerV1::CalculateChi2Z(AliTRDseedV1 *tracklets, Double_t offset, Double_t slope, Double_t xref)
eb38ed55 1436{
41702fec 1437 //
1438 // Calculates the chi2-value of the track in z-Direction including tilting pad correction.
1439 // A linear dependence on the x-value serves as a model.
1440 // The parameters are related to the tilted Riemann fit.
1441 // Parameters: - Array of tracklets (AliTRDseedV1) related to the track candidate
1442 // - the offset for the reference x
1443 // - the slope
1444 // - the reference x position
1445 // Output: - The Chi2 value of the track in z-Direction
1446 //
1447 Float_t chi2Z = 0, nLayers = 0;
053767a4 1448 for (Int_t iLayer = 0; iLayer < AliTRDgeometry::kNlayer; iLayer++) {
41702fec 1449 if(!tracklets[iLayer].IsOK()) continue;
1450 Double_t z = offset + slope * (tracklets[iLayer].GetX0() - xref);
1451 chi2Z += TMath::Abs(tracklets[iLayer].GetMeanz() - z);
1452 nLayers++;
1453 }
1454 chi2Z /= TMath::Max((nLayers - 3.0),1.0);
1455 return chi2Z;
eb38ed55 1456}
1457
bccda319 1458//_____________________________________________________________________________
1459Int_t AliTRDtrackerV1::PropagateToX(AliTRDtrackV1 &t, Double_t xToGo, Double_t maxStep)
1460{
41702fec 1461 //
1462 // Starting from current X-position of track <t> this function
1463 // extrapolates the track up to radial position <xToGo>.
1464 // Returns 1 if track reaches the plane, and 0 otherwise
1465 //
bccda319 1466
41702fec 1467 const Double_t kEpsilon = 0.00001;
bccda319 1468
41702fec 1469 // Current track X-position
1470 Double_t xpos = t.GetX();
bccda319 1471
41702fec 1472 // Direction: inward or outward
1473 Double_t dir = (xpos < xToGo) ? 1.0 : -1.0;
bccda319 1474
41702fec 1475 while (((xToGo - xpos) * dir) > kEpsilon) {
bccda319 1476
41702fec 1477 Double_t xyz0[3];
1478 Double_t xyz1[3];
1479 Double_t param[7];
1480 Double_t x;
1481 Double_t y;
1482 Double_t z;
bccda319 1483
41702fec 1484 // The next step size
1485 Double_t step = dir * TMath::Min(TMath::Abs(xToGo-xpos),maxStep);
bccda319 1486
41702fec 1487 // Get the global position of the starting point
1488 t.GetXYZ(xyz0);
bccda319 1489
41702fec 1490 // X-position after next step
1491 x = xpos + step;
bccda319 1492
41702fec 1493 // Get local Y and Z at the X-position of the next step
1494 if (!t.GetProlongation(x,y,z)) {
1495 return 0; // No prolongation possible
1496 }
bccda319 1497
41702fec 1498 // The global position of the end point of this prolongation step
1499 xyz1[0] = x * TMath::Cos(t.GetAlpha()) - y * TMath::Sin(t.GetAlpha());
1500 xyz1[1] = +x * TMath::Sin(t.GetAlpha()) + y * TMath::Cos(t.GetAlpha());
1501 xyz1[2] = z;
bccda319 1502
41702fec 1503 // Calculate the mean material budget between start and
1504 // end point of this prolongation step
83dea92e 1505 if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param)<=0.) return 0;
bccda319 1506
41702fec 1507 // Propagate the track to the X-position after the next step
9c87a076 1508 if (!t.PropagateTo(x, param[1], param[0]*param[4])) return 0;
bccda319 1509
41702fec 1510 // Rotate the track if necessary
1511 AdjustSector(&t);
bccda319 1512
41702fec 1513 // New track X-position
1514 xpos = t.GetX();
bccda319 1515
41702fec 1516 }
bccda319 1517
41702fec 1518 return 1;
bccda319 1519
1520}
1521
eb38ed55 1522
1523//_____________________________________________________________________________
1524Int_t AliTRDtrackerV1::ReadClusters(TClonesArray* &array, TTree *clusterTree) const
1525{
41702fec 1526 //
1527 // Reads AliTRDclusters from the file.
1528 // The names of the cluster tree and branches
1529 // should match the ones used in AliTRDclusterizer::WriteClusters()
1530 //
1531
1532 Int_t nsize = Int_t(clusterTree->GetTotBytes() / (sizeof(AliTRDcluster)));
1533 TObjArray *clusterArray = new TObjArray(nsize+1000);
1534
1535 TBranch *branch = clusterTree->GetBranch("TRDcluster");
1536 if (!branch) {
1537 AliError("Can't get the branch !");
1538 return 1;
1539 }
1540 branch->SetAddress(&clusterArray);
1541
1542 if(!fClusters){
8ae98148 1543 Float_t nclusters = fReconstructor->GetRecoParam()->GetNClusters();
1544 if(fReconstructor->IsHLT()) nclusters /= AliTRDgeometry::kNsector;
1545 array = new TClonesArray("AliTRDcluster", Int_t(nclusters));
41702fec 1546 array->SetOwner(kTRUE);
1547 }
1548
1549 // Loop through all entries in the tree
1550 Int_t nEntries = (Int_t) clusterTree->GetEntries();
1551 Int_t nbytes = 0;
1552 Int_t ncl = 0;
1553 AliTRDcluster *c = 0x0;
1554 for (Int_t iEntry = 0; iEntry < nEntries; iEntry++) {
1555 // Import the tree
1556 nbytes += clusterTree->GetEvent(iEntry);
1557
1558 // Get the number of points in the detector
1559 Int_t nCluster = clusterArray->GetEntriesFast();
1560 for (Int_t iCluster = 0; iCluster < nCluster; iCluster++) {
1561 if(!(c = (AliTRDcluster *) clusterArray->UncheckedAt(iCluster))) continue;
1562 c->SetInChamber();
1563 new((*fClusters)[ncl++]) AliTRDcluster(*c);
1564 delete (clusterArray->RemoveAt(iCluster));
1565 }
1566
1567 }
1568 delete clusterArray;
1569
1570 return 0;
eb38ed55 1571}
1572
1573//_____________________________________________________________________________
1574Int_t AliTRDtrackerV1::LoadClusters(TTree *cTree)
1575{
41702fec 1576 //
66f6bfd9 1577 // Fills clusters into TRD tracking sectors
41702fec 1578 //
41702fec 1579
48f8adf3 1580 if(!fReconstructor->IsWritingClusters()){
1581 fClusters = AliTRDReconstructor::GetClusters();
1582 } else {
66f6bfd9 1583 if (ReadClusters(fClusters, cTree)) {
1584 AliError("Problem with reading the clusters !");
1585 return 1;
1586 }
1587 }
1588 SetClustersOwner();
1589
48f8adf3 1590 if(!fClusters || !fClusters->GetEntriesFast()){
66f6bfd9 1591 AliInfo("No TRD clusters");
41702fec 1592 return 1;
1593 }
66f6bfd9 1594
1595 //Int_t nin =
1596 BuildTrackingContainers();
1597
1598 //Int_t ncl = fClusters->GetEntriesFast();
1599 //AliInfo(Form("Clusters %d [%6.2f %% in the active volume]", ncl, 100.*float(nin)/ncl));
1600
1601 return 0;
1602}
1603
1604//_____________________________________________________________________________
1605Int_t AliTRDtrackerV1::LoadClusters(TClonesArray *clusters)
1606{
1607 //
1608 // Fills clusters into TRD tracking sectors
1609 // Function for use in the HLT
1610
1611 if(!clusters || !clusters->GetEntriesFast()){
1612 AliInfo("No TRD clusters");
41702fec 1613 return 1;
1614 }
1615
66f6bfd9 1616 fClusters = clusters;
1617 SetClustersOwner();
1618
1619 //Int_t nin =
1620 BuildTrackingContainers();
1621
1622 //Int_t ncl = fClusters->GetEntriesFast();
1623 //AliInfo(Form("Clusters %d [%6.2f %% in the active volume]", ncl, 100.*float(nin)/ncl));
1624
1625 return 0;
1626}
1627
1628
1629//____________________________________________________________________
1630Int_t AliTRDtrackerV1::BuildTrackingContainers()
1631{
1632// Building tracking containers for clusters
1633
1634 Int_t nin =0, icl = fClusters->GetEntriesFast();
41702fec 1635 while (icl--) {
1636 AliTRDcluster *c = (AliTRDcluster *) fClusters->UncheckedAt(icl);
1637 if(c->IsInChamber()) nin++;
1638 Int_t detector = c->GetDetector();
1639 Int_t sector = fGeom->GetSector(detector);
053767a4 1640 Int_t stack = fGeom->GetStack(detector);
1641 Int_t layer = fGeom->GetLayer(detector);
41702fec 1642
053767a4 1643 fTrSec[sector].GetChamber(stack, layer, kTRUE)->InsertCluster(c, icl);
41702fec 1644 }
b0a48c4d 1645
1646 const AliTRDCalDet *cal = AliTRDcalibDB::Instance()->GetT0Det();
053767a4 1647 for(int isector =0; isector<AliTRDgeometry::kNsector; isector++){
41702fec 1648 if(!fTrSec[isector].GetNChambers()) continue;
b0a48c4d 1649 fTrSec[isector].Init(fReconstructor, cal);
41702fec 1650 }
66f6bfd9 1651
1652 return nin;
eb38ed55 1653}
1654
1655
66f6bfd9 1656
0906e73e 1657//____________________________________________________________________
1658void AliTRDtrackerV1::UnloadClusters()
1659{
41702fec 1660 //
1661 // Clears the arrays of clusters and tracks. Resets sectors and timebins
1662 //
0906e73e 1663
41702fec 1664 if(fTracks) fTracks->Delete();
1665 if(fTracklets) fTracklets->Delete();
48f8adf3 1666 if(fClusters){
1667 if(IsClustersOwner()) fClusters->Delete();
1668
1669 // save clusters array in the reconstructor for further use.
1670 if(!fReconstructor->IsWritingClusters()){
1671 AliTRDReconstructor::SetClusters(fClusters);
1672 SetClustersOwner(kFALSE);
1673 } else AliTRDReconstructor::SetClusters(0x0);
1674 }
0906e73e 1675
053767a4 1676 for (int i = 0; i < AliTRDgeometry::kNsector; i++) fTrSec[i].Clear();
0906e73e 1677
41702fec 1678 // Increment the Event Number
1679 AliTRDtrackerDebug::SetEventNumber(AliTRDtrackerDebug::GetEventNumber() + 1);
eb38ed55 1680}
0906e73e 1681
b1957d3c 1682//____________________________________________________________________
1683void AliTRDtrackerV1::UseClusters(const AliKalmanTrack *t, Int_t) const
1684{
1685 const AliTRDtrackV1 *track = dynamic_cast<const AliTRDtrackV1*>(t);
1686 if(!track) return;
1687
1688 AliTRDseedV1 *tracklet = 0x0;
1689 for(Int_t ily=AliTRDgeometry::kNlayer; ily--;){
1690 if(!(tracklet = track->GetTracklet(ily))) continue;
1691 AliTRDcluster *c = 0x0;
1692 for(Int_t ic=AliTRDseed::knTimebins; ic--;){
1693 if(!(c=tracklet->GetClusters(ic))) continue;
1694 c->Use();
1695 }
1696 }
1697}
1698
1699
eb38ed55 1700//_____________________________________________________________________________
1701Bool_t AliTRDtrackerV1::AdjustSector(AliTRDtrackV1 *track)
1702{
41702fec 1703 //
1704 // Rotates the track when necessary
1705 //
1706
1707 Double_t alpha = AliTRDgeometry::GetAlpha();
1708 Double_t y = track->GetY();
1709 Double_t ymax = track->GetX()*TMath::Tan(0.5*alpha);
3cfaffa4 1710
41702fec 1711 if (y > ymax) {
1712 if (!track->Rotate( alpha)) {
1713 return kFALSE;
1714 }
1715 }
1716 else if (y < -ymax) {
1717 if (!track->Rotate(-alpha)) {
1718 return kFALSE;
1719 }
1720 }
1721
1722 return kTRUE;
0906e73e 1723
1724}
1725
eb38ed55 1726
0906e73e 1727//____________________________________________________________________
1728AliTRDseedV1* AliTRDtrackerV1::GetTracklet(AliTRDtrackV1 *track, Int_t p, Int_t &idx)
1729{
41702fec 1730 // Find tracklet for TRD track <track>
1731 // Parameters
1732 // - track
1733 // - sector
1734 // - plane
1735 // - index
1736 // Output
1737 // tracklet
1738 // index
1739 // Detailed description
1740 //
1741 idx = track->GetTrackletIndex(p);
1742 AliTRDseedV1 *tracklet = (idx==0xffff) ? 0x0 : (AliTRDseedV1*)fTracklets->UncheckedAt(idx);
1743
1744 return tracklet;
0906e73e 1745}
1746
1747//____________________________________________________________________
3b57a3f7 1748AliTRDseedV1* AliTRDtrackerV1::SetTracklet(AliTRDseedV1 *tracklet)
0906e73e 1749{
41702fec 1750 // Add this tracklet to the list of tracklets stored in the tracker
1751 //
1752 // Parameters
1753 // - tracklet : pointer to the tracklet to be added to the list
1754 //
1755 // Output
1756 // - the index of the new tracklet in the tracker tracklets list
1757 //
1758 // Detailed description
1759 // Build the tracklets list if it is not yet created (late initialization)
1760 // and adds the new tracklet to the list.
1761 //
1762 if(!fTracklets){
053767a4 1763 fTracklets = new TClonesArray("AliTRDseedV1", AliTRDgeometry::Nsector()*kMaxTracksStack);
41702fec 1764 fTracklets->SetOwner(kTRUE);
1765 }
1766 Int_t nentries = fTracklets->GetEntriesFast();
1767 return new ((*fTracklets)[nentries]) AliTRDseedV1(*tracklet);
972ef65e 1768}
1769
d20df6fc 1770//____________________________________________________________________
1771AliTRDtrackV1* AliTRDtrackerV1::SetTrack(AliTRDtrackV1 *track)
1772{
1773 // Add this track to the list of tracks stored in the tracker
1774 //
1775 // Parameters
1776 // - track : pointer to the track to be added to the list
1777 //
1778 // Output
1779 // - the pointer added
1780 //
1781 // Detailed description
1782 // Build the tracks list if it is not yet created (late initialization)
1783 // and adds the new track to the list.
1784 //
1785 if(!fTracks){
053767a4 1786 fTracks = new TClonesArray("AliTRDtrackV1", AliTRDgeometry::Nsector()*kMaxTracksStack);
d20df6fc 1787 fTracks->SetOwner(kTRUE);
1788 }
1789 Int_t nentries = fTracks->GetEntriesFast();
1790 return new ((*fTracks)[nentries]) AliTRDtrackV1(*track);
1791}
1792
1793
0906e73e 1794
e4f2f73d 1795//____________________________________________________________________
eb38ed55 1796Int_t AliTRDtrackerV1::Clusters2TracksSM(Int_t sector, AliESDEvent *esd)
e4f2f73d 1797{
41702fec 1798 //
1799 // Steer tracking for one SM.
1800 //
1801 // Parameters :
1802 // sector : Array of (SM) propagation layers containing clusters
1803 // esd : The current ESD event. On output it contains the also
1804 // the ESD (TRD) tracks found in this SM.
1805 //
1806 // Output :
1807 // Number of tracks found in this TRD supermodule.
1808 //
1809 // Detailed description
1810 //
1811 // 1. Unpack AliTRDpropagationLayers objects for each stack.
1812 // 2. Launch stack tracking.
1813 // See AliTRDtrackerV1::Clusters2TracksStack() for details.
1814 // 3. Pack results in the ESD event.
1815 //
1816
1817 // allocate space for esd tracks in this SM
1818 TClonesArray esdTrackList("AliESDtrack", 2*kMaxTracksStack);
1819 esdTrackList.SetOwner();
1820
1821 Int_t nTracks = 0;
1822 Int_t nChambers = 0;
1823 AliTRDtrackingChamber **stack = 0x0, *chamber = 0x0;
053767a4 1824 for(int istack = 0; istack<AliTRDgeometry::kNstack; istack++){
41702fec 1825 if(!(stack = fTrSec[sector].GetStack(istack))) continue;
1826 nChambers = 0;
053767a4 1827 for(int ilayer=0; ilayer<AliTRDgeometry::kNlayer; ilayer++){
1828 if(!(chamber = stack[ilayer])) continue;
3a039a31 1829 if(chamber->GetNClusters() < fgNTimeBins * fReconstructor->GetRecoParam() ->GetFindableClusters()) continue;
41702fec 1830 nChambers++;
053767a4 1831 //AliInfo(Form("sector %d stack %d layer %d clusters %d", sector, istack, ilayer, chamber->GetNClusters()));
41702fec 1832 }
1833 if(nChambers < 4) continue;
1834 //AliInfo(Form("Doing stack %d", istack));
1835 nTracks += Clusters2TracksStack(stack, &esdTrackList);
1836 }
1837 //AliInfo(Form("Found %d tracks in SM %d [%d]\n", nTracks, sector, esd->GetNumberOfTracks()));
1838
1839 for(int itrack=0; itrack<nTracks; itrack++)
1840 esd->AddTrack((AliESDtrack*)esdTrackList[itrack]);
1841
1842 // Reset Track and Candidate Number
1843 AliTRDtrackerDebug::SetCandidateNumber(0);
1844 AliTRDtrackerDebug::SetTrackNumber(0);
1845 return nTracks;
e4f2f73d 1846}
1847
1848//____________________________________________________________________
eb38ed55 1849Int_t AliTRDtrackerV1::Clusters2TracksStack(AliTRDtrackingChamber **stack, TClonesArray *esdTrackList)
e4f2f73d 1850{
41702fec 1851 //
1852 // Make tracks in one TRD stack.
1853 //
1854 // Parameters :
1855 // layer : Array of stack propagation layers containing clusters
1856 // esdTrackList : Array of ESD tracks found by the stand alone tracker.
1857 // On exit the tracks found in this stack are appended.
1858 //
1859 // Output :
1860 // Number of tracks found in this stack.
1861 //
1862 // Detailed description
1863 //
1864 // 1. Find the 3 most useful seeding chambers. See BuildSeedingConfigs() for details.
1865 // 2. Steer AliTRDtrackerV1::MakeSeeds() for 3 seeding layer configurations.
1866 // See AliTRDtrackerV1::MakeSeeds() for more details.
1867 // 3. Arrange track candidates in decreasing order of their quality
1868 // 4. Classify tracks in 5 categories according to:
1869 // a) number of layers crossed
1870 // b) track quality
1871 // 5. Sign clusters by tracks in decreasing order of track quality
1872 // 6. Build AliTRDtrack out of seeding tracklets
1873 // 7. Cook MC label
1874 // 8. Build ESD track and register it to the output list
1875 //
1876
b0a48c4d 1877 const AliTRDCalDet *cal = AliTRDcalibDB::Instance()->GetT0Det();
41702fec 1878 AliTRDtrackingChamber *chamber = 0x0;
1879 AliTRDseedV1 sseed[kMaxTracksStack*6]; // to be initialized
1880 Int_t pars[4]; // MakeSeeds parameters
1881
1882 //Double_t alpha = AliTRDgeometry::GetAlpha();
1883 //Double_t shift = .5 * alpha;
1884 Int_t configs[kNConfigs];
1885
1886 // Build initial seeding configurations
1887 Double_t quality = BuildSeedingConfigs(stack, configs);
3a039a31 1888 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){
41702fec 1889 AliInfo(Form("Plane config %d %d %d Quality %f"
1890 , configs[0], configs[1], configs[2], quality));
1891 }
d931f2aa 1892
41702fec 1893
1894 // Initialize contors
1895 Int_t ntracks, // number of TRD track candidates
1896 ntracks1, // number of registered TRD tracks/iter
1897 ntracks2 = 0; // number of all registered TRD tracks in stack
1898 fSieveSeeding = 0;
d931f2aa 1899
1900 // Get stack index
1901 Int_t ic = 0; AliTRDtrackingChamber **cIter = &stack[0];
1902 while(ic<kNPlanes && !(*cIter)){ic++; cIter++;}
1903 if(!(*cIter)) return ntracks2;
1904 Int_t istack = fGeom->GetStack((*cIter)->GetDetector());
1905
41702fec 1906 do{
1907 // Loop over seeding configurations
1908 ntracks = 0; ntracks1 = 0;
1909 for (Int_t iconf = 0; iconf<3; iconf++) {
1910 pars[0] = configs[iconf];
1911 pars[1] = ntracks;
d931f2aa 1912 pars[2] = istack;
41702fec 1913 ntracks = MakeSeeds(stack, &sseed[6*ntracks], pars);
1914 if(ntracks == kMaxTracksStack) break;
1915 }
3a039a31 1916 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1) AliInfo(Form("Candidate TRD tracks %d in iteration %d.", ntracks, fSieveSeeding));
41702fec 1917
1918 if(!ntracks) break;
1919
1920 // Sort the seeds according to their quality
1921 Int_t sort[kMaxTracksStack];
1922 TMath::Sort(ntracks, fTrackQuality, sort, kTRUE);
1923
1924 // Initialize number of tracks so far and logic switches
1925 Int_t ntracks0 = esdTrackList->GetEntriesFast();
1926 Bool_t signedTrack[kMaxTracksStack];
1927 Bool_t fakeTrack[kMaxTracksStack];
1928 for (Int_t i=0; i<ntracks; i++){
1929 signedTrack[i] = kFALSE;
1930 fakeTrack[i] = kFALSE;
1931 }
1932 //AliInfo("Selecting track candidates ...");
1933
1934 // Sieve clusters in decreasing order of track quality
1935 Double_t trackParams[7];
1936 // AliTRDseedV1 *lseed = 0x0;
1937 Int_t jSieve = 0, candidates;
1938 do{
1939 //AliInfo(Form("\t\tITER = %i ", jSieve));
1940
1941 // Check track candidates
1942 candidates = 0;
1943 for (Int_t itrack = 0; itrack < ntracks; itrack++) {
804bb02e 1944 Int_t trackIndex = sort[itrack];
1945 if (signedTrack[trackIndex] || fakeTrack[trackIndex]) continue;
41702fec 1946
1947
804bb02e 1948 // Calculate track parameters from tracklets seeds
804bb02e 1949 Int_t ncl = 0;
1950 Int_t nused = 0;
1951 Int_t nlayers = 0;
1952 Int_t findable = 0;
1953 for (Int_t jLayer = 0; jLayer < kNPlanes; jLayer++) {
1954 Int_t jseed = kNPlanes*trackIndex+jLayer;
1955 if(!sseed[jseed].IsOK()) continue;
1956 if (TMath::Abs(sseed[jseed].GetYref(0) / sseed[jseed].GetX0()) < 0.15) findable++;
1957
1958 sseed[jseed].UpdateUsed();
1959 ncl += sseed[jseed].GetN2();
1960 nused += sseed[jseed].GetNUsed();
1961 nlayers++;
804bb02e 1962 }
1963
41702fec 1964 // Filter duplicated tracks
1965 if (nused > 30){
1966 //printf("Skip %d nused %d\n", trackIndex, nused);
1967 fakeTrack[trackIndex] = kTRUE;
1968 continue;
1969 }
1970 if (Float_t(nused)/ncl >= .25){
1971 //printf("Skip %d nused/ncl >= .25\n", trackIndex);
1972 fakeTrack[trackIndex] = kTRUE;
1973 continue;
1974 }
1975
1976 // Classify tracks
1977 Bool_t skip = kFALSE;
1978 switch(jSieve){
1979 case 0:
1980 if(nlayers < 6) {skip = kTRUE; break;}
1981 if(TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -5.){skip = kTRUE; break;}
1982 break;
1983
1984 case 1:
1985 if(nlayers < findable){skip = kTRUE; break;}
1986 if(TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -4.){skip = kTRUE; break;}
1987 break;
1988
1989 case 2:
1990 if ((nlayers == findable) || (nlayers == 6)) { skip = kTRUE; break;}
1991 if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -6.0){skip = kTRUE; break;}
1992 break;
1993
1994 case 3:
1995 if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -5.){skip = kTRUE; break;}
1996 break;
1997
1998 case 4:
1999 if (nlayers == 3){skip = kTRUE; break;}
2000 //if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) - nused/(nlayers-3.0) < -15.0){skip = kTRUE; break;}
2001 break;
2002 }
2003 if(skip){
2004 candidates++;
2005 //printf("REJECTED : %d [%d] nlayers %d trackQuality = %e nused %d\n", itrack, trackIndex, nlayers, fTrackQuality[trackIndex], nused);
2006 continue;
2007 }
2008 signedTrack[trackIndex] = kTRUE;
2009
41702fec 2010
2011 // Sign clusters
2012 AliTRDcluster *cl = 0x0; Int_t clusterIndex = -1;
be24510a 2013 for (Int_t jLayer = 0; jLayer < kNPlanes; jLayer++) {
41702fec 2014 Int_t jseed = kNPlanes*trackIndex+jLayer;
2015 if(!sseed[jseed].IsOK()) continue;
2016 if(TMath::Abs(sseed[jseed].GetYfit(1) - sseed[jseed].GetYfit(1)) >= .2) continue; // check this condition with Marian
2017 sseed[jseed].UseClusters();
2018 if(!cl){
90cf7133 2019 ic = 0;
41702fec 2020 while(!(cl = sseed[jseed].GetClusters(ic))) ic++;
2021 clusterIndex = sseed[jseed].GetIndexes(ic);
2022 }
2023 }
2024 if(!cl) continue;
2025
2026
2027 // Build track parameters
2028 AliTRDseedV1 *lseed =&sseed[trackIndex*6];
e79f8eb0 2029/* Int_t idx = 0;
41702fec 2030 while(idx<3 && !lseed->IsOK()) {
2031 idx++;
2032 lseed++;
e79f8eb0 2033 }*/
e79f8eb0 2034 Double_t x = lseed->GetX0();// - 3.5;
41702fec 2035 trackParams[0] = x; //NEW AB
e79f8eb0 2036 trackParams[1] = lseed->GetYref(0); // lseed->GetYat(x);
2037 trackParams[2] = lseed->GetZref(0); // lseed->GetZat(x);
2038 trackParams[3] = TMath::Sin(TMath::ATan(lseed->GetYref(1)));
41702fec 2039 trackParams[4] = lseed->GetZref(1) / TMath::Sqrt(1. + lseed->GetYref(1) * lseed->GetYref(1));
be24510a 2040 trackParams[5] = lseed->GetC();
41702fec 2041 Int_t ich = 0; while(!(chamber = stack[ich])) ich++;
2042 trackParams[6] = fGeom->GetSector(chamber->GetDetector());/* *alpha+shift; // Supermodule*/
2043
3a039a31 2044 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){
41702fec 2045 AliInfo(Form("Track %d [%d] nlayers %d trackQuality = %e nused %d, yref = %3.3f", itrack, trackIndex, nlayers, fTrackQuality[trackIndex], nused, trackParams[1]));
2046
2047 Int_t nclusters = 0;
2048 AliTRDseedV1 *dseed[6];
804bb02e 2049
2050 // Build track label - what happens if measured data ???
2051 Int_t labels[1000];
2052 Int_t outlab[1000];
2053 Int_t nlab = 0;
d877f55f 2054
2055 Int_t labelsall[1000];
2056 Int_t nlabelsall = 0;
2057 Int_t naccepted = 0;
2058
804bb02e 2059 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
2060 Int_t jseed = kNPlanes*trackIndex+iLayer;
2061 dseed[iLayer] = new AliTRDseedV1(sseed[jseed]);
2062 dseed[iLayer]->SetOwner();
2063 nclusters += sseed[jseed].GetN2();
2064 if(!sseed[jseed].IsOK()) continue;
2065 for(int ilab=0; ilab<2; ilab++){
2066 if(sseed[jseed].GetLabels(ilab) < 0) continue;
2067 labels[nlab] = sseed[jseed].GetLabels(ilab);
2068 nlab++;
2069 }
d877f55f 2070
2071 // Cooking label
2072 for (Int_t itime = 0; itime < fgNTimeBins; itime++) {
2073 if(!sseed[jseed].IsUsable(itime)) continue;
2074 naccepted++;
2075 Int_t tindex = 0, ilab = 0;
2076 while(ilab<3 && (tindex = sseed[jseed].GetClusters(itime)->GetLabel(ilab)) >= 0){
2077 labelsall[nlabelsall++] = tindex;
2078 ilab++;
2079 }
2080 }
41702fec 2081 }
804bb02e 2082 Freq(nlab,labels,outlab,kFALSE);
2083 Int_t label = outlab[0];
2084 Int_t frequency = outlab[1];
2085 Freq(nlabelsall,labelsall,outlab,kFALSE);
2086 Int_t label1 = outlab[0];
2087 Int_t label2 = outlab[2];
2088 Float_t fakeratio = (naccepted - outlab[1]) / Float_t(naccepted);
2089
41702fec 2090 //Int_t eventNrInFile = esd->GetEventNumberInFile();
2091 //AliInfo(Form("Number of clusters %d.", nclusters));
2092 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2093 Int_t trackNumber = AliTRDtrackerDebug::GetTrackNumber();
2094 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
29f95561 2095 TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
41702fec 2096 cstreamer << "Clusters2TracksStack"
2097 << "EventNumber=" << eventNumber
2098 << "TrackNumber=" << trackNumber
2099 << "CandidateNumber=" << candidateNumber
2100 << "Iter=" << fSieveSeeding
2101 << "Like=" << fTrackQuality[trackIndex]
2102 << "S0.=" << dseed[0]
2103 << "S1.=" << dseed[1]
2104 << "S2.=" << dseed[2]
2105 << "S3.=" << dseed[3]
2106 << "S4.=" << dseed[4]
2107 << "S5.=" << dseed[5]
2108 << "p0=" << trackParams[0]
2109 << "p1=" << trackParams[1]
2110 << "p2=" << trackParams[2]
2111 << "p3=" << trackParams[3]
2112 << "p4=" << trackParams[4]
2113 << "p5=" << trackParams[5]
2114 << "p6=" << trackParams[6]
2115 << "Label=" << label
2116 << "Label1=" << label1
2117 << "Label2=" << label2
2118 << "FakeRatio=" << fakeratio
2119 << "Freq=" << frequency
2120 << "Ncl=" << ncl
2121 << "NLayers=" << nlayers
2122 << "Findable=" << findable
41702fec 2123 << "NUsed=" << nused
2124 << "\n";
2125 }
2126
2127 AliTRDtrackV1 *track = MakeTrack(&sseed[trackIndex*kNPlanes], trackParams);
2128 if(!track){
2129 AliWarning("Fail to build a TRD Track.");
2130 continue;
2131 }
76b60503 2132
41702fec 2133 //AliInfo("End of MakeTrack()");
098c3c3d 2134 AliESDtrack *esdTrack = new ((*esdTrackList)[ntracks0++]) AliESDtrack();
2135 esdTrack->UpdateTrackParams(track, AliESDtrack::kTRDout);
2136 esdTrack->SetLabel(track->GetLabel());
2137 track->UpdateESDtrack(esdTrack);
41702fec 2138 // write ESD-friends if neccessary
3a039a31 2139 if (fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 0){
41702fec 2140 AliTRDtrackV1 *calibTrack = new AliTRDtrackV1(*track);
2141 calibTrack->SetOwner();
098c3c3d 2142 esdTrack->AddCalibObject(calibTrack);
41702fec 2143 }
41702fec 2144 ntracks1++;
2145 AliTRDtrackerDebug::SetTrackNumber(AliTRDtrackerDebug::GetTrackNumber() + 1);
2146 }
2147
2148 jSieve++;
2149 } while(jSieve<5 && candidates); // end track candidates sieve
2150 if(!ntracks1) break;
2151
2152 // increment counters
2153 ntracks2 += ntracks1;
4302c900 2154
2155 if(fReconstructor->IsHLT()) break;
41702fec 2156 fSieveSeeding++;
2157
2158 // Rebuild plane configurations and indices taking only unused clusters into account
2159 quality = BuildSeedingConfigs(stack, configs);
3a039a31 2160 if(quality < 1.E-7) break; //fReconstructor->GetRecoParam() ->GetPlaneQualityThreshold()) break;
41702fec 2161
2162 for(Int_t ip = 0; ip < kNPlanes; ip++){
2163 if(!(chamber = stack[ip])) continue;
b0a48c4d 2164 chamber->Build(fGeom, cal);//Indices(fSieveSeeding);
41702fec 2165 }
2166
3a039a31 2167 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){
41702fec 2168 AliInfo(Form("Sieve level %d Plane config %d %d %d Quality %f", fSieveSeeding, configs[0], configs[1], configs[2], quality));
2169 }
2170 } while(fSieveSeeding<10); // end stack clusters sieve
2171
2172
2173
2174 //AliInfo(Form("Registered TRD tracks %d in stack %d.", ntracks2, pars[1]));
2175
2176 return ntracks2;
e4f2f73d 2177}
2178
2179//___________________________________________________________________
eb38ed55 2180Double_t AliTRDtrackerV1::BuildSeedingConfigs(AliTRDtrackingChamber **stack, Int_t *configs)
e4f2f73d 2181{
41702fec 2182 //
2183 // Assign probabilities to chambers according to their
2184 // capability of producing seeds.
2185 //
2186 // Parameters :
2187 //
2188 // layers : Array of stack propagation layers for all 6 chambers in one stack
2189 // configs : On exit array of configuration indexes (see GetSeedingConfig()
2190 // for details) in the decreasing order of their seeding probabilities.
2191 //
2192 // Output :
2193 //
2194 // Return top configuration quality
2195 //
2196 // Detailed description:
2197 //
2198 // To each chamber seeding configuration (see GetSeedingConfig() for
2199 // the list of all configurations) one defines 2 quality factors:
2200 // - an apriori topological quality (see GetSeedingConfig() for details) and
2201 // - a data quality based on the uniformity of the distribution of
2202 // clusters over the x range (time bins population). See CookChamberQA() for details.
2203 // The overall chamber quality is given by the product of this 2 contributions.
2204 //
2205
2206 Double_t chamberQ[kNPlanes];
2207 AliTRDtrackingChamber *chamber = 0x0;
2208 for(int iplane=0; iplane<kNPlanes; iplane++){
2209 if(!(chamber = stack[iplane])) continue;
2210 chamberQ[iplane] = (chamber = stack[iplane]) ? chamber->GetQuality() : 0.;
2211 }
2212
2213 Double_t tconfig[kNConfigs];
2214 Int_t planes[4];
2215 for(int iconf=0; iconf<kNConfigs; iconf++){
2216 GetSeedingConfig(iconf, planes);
2217 tconfig[iconf] = fgTopologicQA[iconf];
2218 for(int iplane=0; iplane<4; iplane++) tconfig[iconf] *= chamberQ[planes[iplane]];
2219 }
2220
2221 TMath::Sort((Int_t)kNConfigs, tconfig, configs, kTRUE);
2222 // AliInfo(Form("q[%d] = %f", configs[0], tconfig[configs[0]]));
2223 // AliInfo(Form("q[%d] = %f", configs[1], tconfig[configs[1]]));
2224 // AliInfo(Form("q[%d] = %f", configs[2], tconfig[configs[2]]));
2225
2226 return tconfig[configs[0]];
e4f2f73d 2227}
2228
2229//____________________________________________________________________
eb38ed55 2230Int_t AliTRDtrackerV1::MakeSeeds(AliTRDtrackingChamber **stack, AliTRDseedV1 *sseed, Int_t *ipar)
e4f2f73d 2231{
41702fec 2232 //
2233 // Make tracklet seeds in the TRD stack.
2234 //
2235 // Parameters :
2236 // layers : Array of stack propagation layers containing clusters
2237 // sseed : Array of empty tracklet seeds. On exit they are filled.
2238 // ipar : Control parameters:
2239 // ipar[0] -> seeding chambers configuration
2240 // ipar[1] -> stack index
2241 // ipar[2] -> number of track candidates found so far
2242 //
2243 // Output :
2244 // Number of tracks candidates found.
2245 //
2246 // Detailed description
2247 //
2248 // The following steps are performed:
2249 // 1. Select seeding layers from seeding chambers
2250 // 2. Select seeding clusters from the seeding AliTRDpropagationLayerStack.
2251 // The clusters are taken from layer 3, layer 0, layer 1 and layer 2, in
2252 // this order. The parameters controling the range of accepted clusters in
2253 // layer 0, 1, and 2 are defined in AliTRDchamberTimeBin::BuildCond().
2254 // 3. Helix fit of the cluster set. (see AliTRDtrackerFitter::FitRieman(AliTRDcluster**))
2255 // 4. Initialize seeding tracklets in the seeding chambers.
2256 // 5. Filter 0.
2257 // Chi2 in the Y direction less than threshold ... (1./(3. - sLayer))
2258 // Chi2 in the Z direction less than threshold ... (1./(3. - sLayer))
2259 // 6. Attach clusters to seeding tracklets and find linear approximation of
2260 // the tracklet (see AliTRDseedV1::AttachClustersIter()). The number of used
2261 // clusters used by current seeds should not exceed ... (25).
2262 // 7. Filter 1.
2263 // All 4 seeding tracklets should be correctly constructed (see
2264 // AliTRDseedV1::AttachClustersIter())
2265 // 8. Helix fit of the seeding tracklets
2266 // 9. Filter 2.
2267 // Likelihood calculation of the fit. (See AliTRDtrackerV1::CookLikelihood() for details)
2268 // 10. Extrapolation of the helix fit to the other 2 chambers:
2269 // a) Initialization of extrapolation tracklet with fit parameters
2270 // b) Helix fit of tracklets
2271 // c) Attach clusters and linear interpolation to extrapolated tracklets
2272 // d) Helix fit of tracklets
2273 // 11. Improve seeding tracklets quality by reassigning clusters.
2274 // See AliTRDtrackerV1::ImproveSeedQuality() for details.
2275 // 12. Helix fit of all 6 seeding tracklets and chi2 calculation
2276 // 13. Hyperplane fit and track quality calculation. See AliTRDtrackerFitter::FitHyperplane() for details.
2277 // 14. Cooking labels for tracklets. Should be done only for MC
2278 // 15. Register seeds.
2279 //
2280
2281 AliTRDtrackingChamber *chamber = 0x0;
be24510a 2282 AliTRDcluster *c[kNSeedPlanes] = {0x0, 0x0, 0x0, 0x0}; // initilize seeding clusters
41702fec 2283 AliTRDseedV1 *cseed = &sseed[0]; // initialize tracklets for first track
2284 Int_t ncl, mcl; // working variable for looping over clusters
2285 Int_t index[AliTRDchamberTimeBin::kMaxClustersLayer], jndex[AliTRDchamberTimeBin::kMaxClustersLayer];
2286 // chi2 storage
2287 // chi2[0] = tracklet chi2 on the Z direction
2288 // chi2[1] = tracklet chi2 on the R direction
2289 Double_t chi2[4];
2290
e79f8eb0 2291 // Default positions for the anode wire in all 6 Layers in case of a stack with missing clusters
2292 // Positions taken using cosmic data taken with SM3 after rebuild
d931f2aa 2293 Double_t x_def[kNPlanes] = {300.2, 312.8, 325.4, 338.0, 350.6, 363.2};
41702fec 2294
2295 // this should be data member of AliTRDtrack
2296 Double_t seedQuality[kMaxTracksStack];
2297
2298 // unpack control parameters
2299 Int_t config = ipar[0];
2300 Int_t ntracks = ipar[1];
d931f2aa 2301 Int_t istack = ipar[2];
41702fec 2302 Int_t planes[kNSeedPlanes]; GetSeedingConfig(config, planes);
be24510a 2303 Int_t planesExt[kNPlanes-kNSeedPlanes]; GetExtrapolationConfig(config, planesExt);
2304
2305
41702fec 2306 // Init chambers geometry
41702fec 2307 Double_t hL[kNPlanes]; // Tilting angle
2308 Float_t padlength[kNPlanes]; // pad lenghts
2309 AliTRDpadPlane *pp = 0x0;
2310 for(int iplane=0; iplane<kNPlanes; iplane++){
2311 pp = fGeom->GetPadPlane(iplane, istack);
bb79ccd5 2312 hL[iplane] = TMath::Tan(TMath::DegToRad()*pp->GetTiltingAngle());
41702fec 2313 padlength[iplane] = pp->GetLengthIPad();
2314 }
2315
3a039a31 2316 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){
41702fec 2317 AliInfo(Form("Making seeds Stack[%d] Config[%d] Tracks[%d]...", istack, config, ntracks));
2318 }
2319
d931f2aa 2320 // Build seeding layers
d611c74f 2321 ResetSeedTB();
41702fec 2322 Int_t nlayers = 0;
41702fec 2323 for(int isl=0; isl<kNSeedPlanes; isl++){
2324 if(!(chamber = stack[planes[isl]])) continue;
3a039a31 2325 if(!chamber->GetSeedingLayer(fSeedTB[isl], fGeom, fReconstructor)) continue;
41702fec 2326 nlayers++;
41702fec 2327 }
1ba638fc 2328 if(nlayers < 4) return ntracks;
41702fec 2329
2330
2331 // Start finding seeds
2332 Double_t cond0[4], cond1[4], cond2[4];
2333 Int_t icl = 0;
d611c74f 2334 while((c[3] = (*fSeedTB[3])[icl++])){
41702fec 2335 if(!c[3]) continue;
d611c74f 2336 fSeedTB[0]->BuildCond(c[3], cond0, 0);
2337 fSeedTB[0]->GetClusters(cond0, index, ncl);
41702fec 2338 //printf("Found c[3] candidates 0 %d\n", ncl);
2339 Int_t jcl = 0;
2340 while(jcl<ncl) {
d611c74f 2341 c[0] = (*fSeedTB[0])[index[jcl++]];
41702fec 2342 if(!c[0]) continue;
2343 Double_t dx = c[3]->GetX() - c[0]->GetX();
2344 Double_t theta = (c[3]->GetZ() - c[0]->GetZ())/dx;
2345 Double_t phi = (c[3]->GetY() - c[0]->GetY())/dx;
d611c74f 2346 fSeedTB[1]->BuildCond(c[0], cond1, 1, theta, phi);
2347 fSeedTB[1]->GetClusters(cond1, jndex, mcl);
41702fec 2348 //printf("Found c[0] candidates 1 %d\n", mcl);
2349
2350 Int_t kcl = 0;
2351 while(kcl<mcl) {
d611c74f 2352 c[1] = (*fSeedTB[1])[jndex[kcl++]];
2353 if(!c[1]) continue;
2354 fSeedTB[2]->BuildCond(c[1], cond2, 2, theta, phi);
2355 c[2] = fSeedTB[2]->GetNearestCluster(cond2);
2356 //printf("Found c[1] candidate 2 %p\n", c[2]);
2357 if(!c[2]) continue;
2358
2359 // AliInfo("Seeding clusters found. Building seeds ...");
2360 // 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());
2361
804bb02e 2362 for (Int_t il = 0; il < kNPlanes; il++) cseed[il].Reset();
41702fec 2363
d611c74f 2364 FitRieman(c, chi2);
2365
d931f2aa 2366 AliTRDseedV1 *tseed = &cseed[0];
2367 AliTRDtrackingChamber **cIter = &stack[0];
2368 for(int iLayer=0; iLayer<kNPlanes; iLayer++, tseed++, cIter++){
2369 tseed->SetDetector((*cIter) ? (*cIter)->GetDetector() : -1);
43d6ad34 2370 tseed->SetTilt(hL[iLayer]);
2371 tseed->SetPadLength(padlength[iLayer]);
3a039a31 2372 tseed->SetReconstructor(fReconstructor);
d931f2aa 2373 tseed->SetX0((*cIter) ? (*cIter)->GetX() : x_def[iLayer]);
d611c74f 2374 tseed->Init(GetRiemanFitter());
2375 }
2376
2377 Bool_t isFake = kFALSE;
3a039a31 2378 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){
d611c74f 2379 if (c[0]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
2380 if (c[1]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
2381 if (c[2]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
2382
2383 Double_t xpos[4];
2384 for(Int_t l = 0; l < kNSeedPlanes; l++) xpos[l] = fSeedTB[l]->GetX();
2385 Float_t yref[4];
2386 for(int il=0; il<4; il++) yref[il] = cseed[planes[il]].GetYref(0);
2387 Int_t ll = c[3]->GetLabel(0);
2388 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2389 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2390 AliRieman *rim = GetRiemanFitter();
29f95561 2391 TTreeSRedirector &cs0 = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
d611c74f 2392 cs0 << "MakeSeeds0"
2393 <<"EventNumber=" << eventNumber
2394 <<"CandidateNumber=" << candidateNumber
2395 <<"isFake=" << isFake
2396 <<"config=" << config
2397 <<"label=" << ll
2398 <<"chi2z=" << chi2[0]
2399 <<"chi2y=" << chi2[1]
2400 <<"Y2exp=" << cond2[0]
2401 <<"Z2exp=" << cond2[1]
2402 <<"X0=" << xpos[0] //layer[sLayer]->GetX()
2403 <<"X1=" << xpos[1] //layer[sLayer + 1]->GetX()
2404 <<"X2=" << xpos[2] //layer[sLayer + 2]->GetX()
2405 <<"X3=" << xpos[3] //layer[sLayer + 3]->GetX()
2406 <<"yref0=" << yref[0]
2407 <<"yref1=" << yref[1]
2408 <<"yref2=" << yref[2]
2409 <<"yref3=" << yref[3]
2410 <<"c0.=" << c[0]
2411 <<"c1.=" << c[1]
2412 <<"c2.=" << c[2]
2413 <<"c3.=" << c[3]
2414 <<"Seed0.=" << &cseed[planes[0]]
2415 <<"Seed1.=" << &cseed[planes[1]]
2416 <<"Seed2.=" << &cseed[planes[2]]
2417 <<"Seed3.=" << &cseed[planes[3]]
2418 <<"RiemanFitter.=" << rim
2419 <<"\n";
2420 }
3a039a31 2421 if(chi2[0] > fReconstructor->GetRecoParam() ->GetChi2Z()/*7./(3. - sLayer)*//*iter*/){
91834b8d 2422// //AliInfo(Form("Failed chi2 filter on chi2Z [%f].", chi2[0]));
d611c74f 2423 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2424 continue;
2425 }
3a039a31 2426 if(chi2[1] > fReconstructor->GetRecoParam() ->GetChi2Y()/*1./(3. - sLayer)*//*iter*/){
91834b8d 2427// //AliInfo(Form("Failed chi2 filter on chi2Y [%f].", chi2[1]));
d611c74f 2428 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2429 continue;
2430 }
2431 //AliInfo("Passed chi2 filter.");
2432
2433 // try attaching clusters to tracklets
2434 Int_t nUsedCl = 0;
2435 Int_t mlayers = 0;
be24510a 2436 for(int iLayer=0; iLayer<kNSeedPlanes; iLayer++){
d611c74f 2437 Int_t jLayer = planes[iLayer];
2438 if(!cseed[jLayer].AttachClustersIter(stack[jLayer], 5., kFALSE, c[iLayer])) continue;
2439 nUsedCl += cseed[jLayer].GetNUsed();
2440 if(nUsedCl > 25) break;
2441 mlayers++;
2442 }
be24510a 2443
2444 if(mlayers < kNSeedPlanes){
2445 //AliInfo(Form("Failed updating all seeds %d [%d].", mlayers, kNSeedPlanes));
2446 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2447 continue;
2448 }
2449
2450 // temporary exit door for the HLT
4302c900 2451 if(fReconstructor->IsHLT()){
be24510a 2452 // attach clusters to extrapolation chambers
2453 for(int iLayer=0; iLayer<kNPlanes-kNSeedPlanes; iLayer++){
2454 Int_t jLayer = planesExt[iLayer];
2455 if(!(chamber = stack[jLayer])) continue;
2456 cseed[jLayer].AttachClustersIter(chamber, 1000.);
2457 }
4302c900 2458 fTrackQuality[ntracks] = 1.; // dummy value
2459 ntracks++;
218ba867 2460 if(ntracks == kMaxTracksStack) return ntracks;
4302c900 2461 cseed += 6;
2462 continue;
2463 }
2464
be24510a 2465
d611c74f 2466 // fit tracklets and cook likelihood
2467 FitTiltedRieman(&cseed[0], kTRUE);// Update Seeds and calculate Likelihood
91834b8d 2468 Double_t like = CookLikelihood(&cseed[0], planes); // to be checked
d611c74f 2469
3a039a31 2470 if (TMath::Log(1.E-9 + like) < fReconstructor->GetRecoParam() ->GetTrackLikelihood()){
d611c74f 2471 //AliInfo(Form("Failed likelihood %f[%e].", TMath::Log(1.E-9 + like), like));
2472 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2473 continue;
2474 }
2475 //AliInfo(Form("Passed likelihood %f[%e].", TMath::Log(1.E-9 + like), like));
2476
2477 // book preliminary results
2478 seedQuality[ntracks] = like;
2479 fSeedLayer[ntracks] = config;/*sLayer;*/
2480
2481 // attach clusters to the extrapolation seeds
d611c74f 2482 Int_t nusedf = 0; // debug value
be24510a 2483 for(int iLayer=0; iLayer<kNPlanes-kNSeedPlanes; iLayer++){
2484 Int_t jLayer = planesExt[iLayer];
d611c74f 2485 if(!(chamber = stack[jLayer])) continue;
d611c74f 2486
2487 // fit extrapolated seed
2488 if ((jLayer == 0) && !(cseed[1].IsOK())) continue;
2489 if ((jLayer == 5) && !(cseed[4].IsOK())) continue;
2490 AliTRDseedV1 pseed = cseed[jLayer];
2491 if(!pseed.AttachClustersIter(chamber, 1000.)) continue;
2492 cseed[jLayer] = pseed;
2493 nusedf += cseed[jLayer].GetNUsed(); // debug value
2494 FitTiltedRieman(cseed, kTRUE);
2495 }
2496
2497 // AliInfo("Extrapolation done.");
2498 // Debug Stream containing all the 6 tracklets
3a039a31 2499 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){
29f95561 2500 TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
d611c74f 2501 TLinearFitter *tiltedRieman = GetTiltedRiemanFitter();
2502 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2503 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2504 cstreamer << "MakeSeeds1"
2505 << "EventNumber=" << eventNumber
2506 << "CandidateNumber=" << candidateNumber
2507 << "S0.=" << &cseed[0]
2508 << "S1.=" << &cseed[1]
2509 << "S2.=" << &cseed[2]
2510 << "S3.=" << &cseed[3]
2511 << "S4.=" << &cseed[4]
2512 << "S5.=" << &cseed[5]
2513 << "FitterT.=" << tiltedRieman
2514 << "\n";
2515 }
2516
fb872574 2517 if(fReconstructor->GetRecoParam()->HasImproveTracklets() && ImproveSeedQuality(stack, cseed) < 4){
d611c74f 2518 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2519 continue;
2520 }
2521 //AliInfo("Improve seed quality done.");
2522
2523 // fit full track and cook likelihoods
2524 // Double_t curv = FitRieman(&cseed[0], chi2);
2525 // Double_t chi2ZF = chi2[0] / TMath::Max((mlayers - 3.), 1.);
2526 // Double_t chi2RF = chi2[1] / TMath::Max((mlayers - 3.), 1.);
2527
2528 // do the final track fitting (Once with vertex constraint and once without vertex constraint)
2529 Double_t chi2Vals[3];
2530 chi2Vals[0] = FitTiltedRieman(&cseed[0], kFALSE);
91834b8d 2531 if(fReconstructor->GetRecoParam()->IsVertexConstrained())
d611c74f 2532 chi2Vals[1] = FitTiltedRiemanConstraint(&cseed[0], GetZ()); // Do Vertex Constrained fit if desired
2533 else
2534 chi2Vals[1] = 1.;
2535 chi2Vals[2] = GetChi2Z(&cseed[0]) / TMath::Max((mlayers - 3.), 1.);
2536 // Chi2 definitions in testing stage
2537 //chi2Vals[2] = GetChi2ZTest(&cseed[0]);
2538 fTrackQuality[ntracks] = CalculateTrackLikelihood(&cseed[0], &chi2Vals[0]);
2539 //AliInfo("Hyperplane fit done\n");
2540
2541 // finalize tracklets
2542 Int_t labels[12];
2543 Int_t outlab[24];
2544 Int_t nlab = 0;
2545 for (Int_t iLayer = 0; iLayer < 6; iLayer++) {
2546 if (!cseed[iLayer].IsOK()) continue;
2547
2548 if (cseed[iLayer].GetLabels(0) >= 0) {
2549 labels[nlab] = cseed[iLayer].GetLabels(0);
2550 nlab++;
2551 }
2552
2553 if (cseed[iLayer].GetLabels(1) >= 0) {
2554 labels[nlab] = cseed[iLayer].GetLabels(1);
2555 nlab++;
2556 }
2557 }
2558 Freq(nlab,labels,outlab,kFALSE);
2559 Int_t label = outlab[0];
2560 Int_t frequency = outlab[1];
2561 for (Int_t iLayer = 0; iLayer < 6; iLayer++) {
2562 cseed[iLayer].SetFreq(frequency);
2563 cseed[iLayer].SetChi2Z(chi2[1]);
2564 }
2565
3a039a31 2566 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){
29f95561 2567 TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
d611c74f 2568 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2569 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2570 TLinearFitter *fitterTC = GetTiltedRiemanFitterConstraint();
2571 TLinearFitter *fitterT = GetTiltedRiemanFitter();
91834b8d 2572 Int_t ncls = 0;
2573 for(Int_t iseed = 0; iseed < kNPlanes; iseed++){
2574 ncls += cseed[iseed].IsOK() ? cseed[iseed].GetN2() : 0;
2575 }
d611c74f 2576 cstreamer << "MakeSeeds2"
2577 << "EventNumber=" << eventNumber
2578 << "CandidateNumber=" << candidateNumber
2579 << "Chi2TR=" << chi2Vals[0]
2580 << "Chi2TC=" << chi2Vals[1]
2581 << "Nlayers=" << mlayers
91834b8d 2582 << "NClusters=" << ncls
d611c74f 2583 << "NUsedS=" << nUsedCl
2584 << "NUsed=" << nusedf
2585 << "Like=" << like
2586 << "S0.=" << &cseed[0]
2587 << "S1.=" << &cseed[1]
2588 << "S2.=" << &cseed[2]
2589 << "S3.=" << &cseed[3]
2590 << "S4.=" << &cseed[4]
2591 << "S5.=" << &cseed[5]
2592 << "Label=" << label
2593 << "Freq=" << frequency
2594 << "FitterT.=" << fitterT
2595 << "FitterTC.=" << fitterTC
2596 << "\n";
2597 }
2598
2599 ntracks++;
2600 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2601 if(ntracks == kMaxTracksStack){
2602 AliWarning(Form("Number of seeds reached maximum allowed (%d) in stack.", kMaxTracksStack));
2603 return ntracks;
2604 }
2605 cseed += 6;
41702fec 2606 }
2607 }
2608 }
41702fec 2609
2610 return ntracks;
e4f2f73d 2611}
2612
2613//_____________________________________________________________________________
0906e73e 2614AliTRDtrackV1* AliTRDtrackerV1::MakeTrack(AliTRDseedV1 *seeds, Double_t *params)
e4f2f73d 2615{
41702fec 2616 //
2617 // Build a TRD track out of tracklet candidates
2618 //
2619 // Parameters :
2620 // seeds : array of tracklets
2621 // params : track parameters (see MakeSeeds() function body for a detailed description)
2622 //
2623 // Output :
2624 // The TRD track.
2625 //
2626 // Detailed description
2627 //
2628 // To be discussed with Marian !!
2629 //
2630
41702fec 2631
2632 Double_t alpha = AliTRDgeometry::GetAlpha();
2633 Double_t shift = AliTRDgeometry::GetAlpha()/2.0;
2634 Double_t c[15];
2635
2636 c[ 0] = 0.2;
2637 c[ 1] = 0.0; c[ 2] = 2.0;
2638 c[ 3] = 0.0; c[ 4] = 0.0; c[ 5] = 0.02;
2639 c[ 6] = 0.0; c[ 7] = 0.0; c[ 8] = 0.0; c[ 9] = 0.1;
2640 c[10] = 0.0; c[11] = 0.0; c[12] = 0.0; c[13] = 0.0; c[14] = params[5]*params[5]*0.01;
2641
d20df6fc 2642 AliTRDtrackV1 track(seeds, &params[1], c, params[0], params[6]*alpha+shift);
2643 track.PropagateTo(params[0]-5.0);
91834b8d 2644 if(fReconstructor->IsHLT()){
2645 AliTRDseedV1 *ptrTracklet = 0x0;
2646 for(Int_t ip=0; ip<kNPlanes; ip++){
2647 track.UnsetTracklet(ip);
2648 ptrTracklet = SetTracklet(&seeds[ip]);
2649 track.SetTracklet(ptrTracklet, fTracklets->GetEntriesFast()-1);
2650 }
d78d7df0 2651 AliTRDtrackV1 *ptrTrack = SetTrack(&track);
2652 ptrTrack->SetReconstructor(fReconstructor);
2653 return ptrTrack;
91834b8d 2654 }
393fda1c 2655
d20df6fc 2656 track.ResetCovariance(1);
e79f8eb0 2657 Int_t nc = TMath::Abs(FollowBackProlongation(track));
393fda1c 2658 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 5){
2659 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2660 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2661 Double_t p[5]; // Track Params for the Debug Stream
2662 track.GetExternalParameters(params[0], p);
29f95561 2663 TTreeSRedirector &cs = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
393fda1c 2664 cs << "MakeTrack"
2665 << "EventNumber=" << eventNumber
2666 << "CandidateNumber=" << candidateNumber
2667 << "nc=" << nc
2668 << "X=" << params[0]
2669 << "Y=" << p[0]
2670 << "Z=" << p[1]
2671 << "snp=" << p[2]
2672 << "tnd=" << p[3]
2673 << "crv=" << p[4]
2674 << "Yin=" << params[1]
2675 << "Zin=" << params[2]
2676 << "snpin=" << params[3]
2677 << "tndin=" << params[4]
2678 << "crvin=" << params[5]
2679 << "track.=" << &track
2680 << "\n";
2681 }
d20df6fc 2682 if (nc < 30) return 0x0;
2683
2684 AliTRDtrackV1 *ptrTrack = SetTrack(&track);
215f7116 2685 ptrTrack->SetReconstructor(fReconstructor);
48f8adf3 2686 ptrTrack->CookLabel(.9);
24253b0a 2687
d20df6fc 2688 // computes PID for track
2689 ptrTrack->CookPID();
2690 // update calibration references using this track
48f8adf3 2691 AliTRDCalibraFillHisto *calibra = AliTRDCalibraFillHisto::Instance();
2692 if (!calibra){
2693 AliInfo("Could not get Calibra instance\n");
2694 if(calibra->GetHisto2d()) calibra->UpdateHistogramsV1(ptrTrack);
2695 }
d20df6fc 2696 return ptrTrack;
e4f2f73d 2697}
2698
0906e73e 2699
2700//____________________________________________________________________
eb38ed55 2701Int_t AliTRDtrackerV1::ImproveSeedQuality(AliTRDtrackingChamber **stack, AliTRDseedV1 *cseed)
e4f2f73d 2702{
41702fec 2703 //
2704 // Sort tracklets according to "quality" and try to "improve" the first 4 worst
2705 //
2706 // Parameters :
2707 // layers : Array of propagation layers for a stack/supermodule
2708 // cseed : Array of 6 seeding tracklets which has to be improved
2709 //
2710 // Output :
2711 // cssed : Improved seeds
2712 //
2713 // Detailed description
2714 //
2715 // Iterative procedure in which new clusters are searched for each
2716 // tracklet seed such that the seed quality (see AliTRDseed::GetQuality())
2717 // can be maximized. If some optimization is found the old seeds are replaced.
2718 //
2719 // debug level: 7
2720 //
2721
2722 // make a local working copy
2723 AliTRDtrackingChamber *chamber = 0x0;
2724 AliTRDseedV1 bseed[6];
2725 Int_t nLayers = 0;
2726 for (Int_t jLayer = 0; jLayer < 6; jLayer++) bseed[jLayer] = cseed[jLayer];
2727
2728 Float_t lastquality = 10000.0;
2729 Float_t lastchi2 = 10000.0;
2730 Float_t chi2 = 1000.0;
2731
2732 for (Int_t iter = 0; iter < 4; iter++) {
2733 Float_t sumquality = 0.0;
2734 Float_t squality[6];
2735 Int_t sortindexes[6];
2736
2737 for (Int_t jLayer = 0; jLayer < 6; jLayer++) {
3a039a31 2738 squality[jLayer] = bseed[jLayer].IsOK() ? bseed[jLayer].GetQuality(kTRUE) : 1000.;
41702fec 2739 sumquality += squality[jLayer];
2740 }
2741 if ((sumquality >= lastquality) || (chi2 > lastchi2)) break;
2742
2743 nLayers = 0;
2744 lastquality = sumquality;
2745 lastchi2 = chi2;
2746 if (iter > 0) for (Int_t jLayer = 0; jLayer < 6; jLayer++) cseed[jLayer] = bseed[jLayer];
2747
2748 TMath::Sort(6, squality, sortindexes, kFALSE);
2749 for (Int_t jLayer = 5; jLayer > 1; jLayer--) {
2750 Int_t bLayer = sortindexes[jLayer];
2751 if(!(chamber = stack[bLayer])) continue;
2752 bseed[bLayer].AttachClustersIter(chamber, squality[bLayer], kTRUE);
2753 if(bseed[bLayer].IsOK()) nLayers++;
2754 }
2755
2756 chi2 = FitTiltedRieman(bseed, kTRUE);
3a039a31 2757 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 7){
41702fec 2758 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2759 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2760 TLinearFitter *tiltedRieman = GetTiltedRiemanFitter();
29f95561 2761 TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
41702fec 2762 cstreamer << "ImproveSeedQuality"
2763 << "EventNumber=" << eventNumber
2764 << "CandidateNumber=" << candidateNumber
2765 << "Iteration=" << iter
2766 << "S0.=" << &bseed[0]
2767 << "S1.=" << &bseed[1]
2768 << "S2.=" << &bseed[2]
2769 << "S3.=" << &bseed[3]
2770 << "S4.=" << &bseed[4]
2771 << "S5.=" << &bseed[5]
2772 << "FitterT.=" << tiltedRieman
2773 << "\n";
2774 }
2775 } // Loop: iter
2776
2777 // we are sure that at least 2 tracklets are OK !
2778 return nLayers+2;
e4f2f73d 2779}
2780
eb38ed55 2781//_________________________________________________________________________
2782Double_t AliTRDtrackerV1::CalculateTrackLikelihood(AliTRDseedV1 *tracklets, Double_t *chi2){
41702fec 2783 //
2784 // Calculates the Track Likelihood value. This parameter serves as main quality criterion for
2785 // the track selection
2786 // The likelihood value containes:
2787 // - The chi2 values from the both fitters and the chi2 values in z-direction from a linear fit
2788 // - The Sum of the Parameter |slope_ref - slope_fit|/Sigma of the tracklets
2789 // For all Parameters an exponential dependency is used
2790 //
2791 // Parameters: - Array of tracklets (AliTRDseedV1) related to the track candidate
2792 // - Array of chi2 values:
2793 // * Non-Constrained Tilted Riemann fit
2794 // * Vertex-Constrained Tilted Riemann fit
2795 // * z-Direction from Linear fit
2796 // Output: - The calculated track likelihood
2797 //
2798 // debug level 2
2799 //
2800
2801 Double_t sumdaf = 0, nLayers = 0;
2802 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
2803 if(!tracklets[iLayer].IsOK()) continue;
2804 sumdaf += TMath::Abs((tracklets[iLayer].GetYfit(1) - tracklets[iLayer].GetYref(1))/ tracklets[iLayer].GetSigmaY2());
2805 nLayers++;
2806 }
2807 sumdaf /= Float_t (nLayers - 2.0);
2808
2809 Double_t likeChi2Z = TMath::Exp(-chi2[2] * 0.14); // Chi2Z
3a039a31 2810 Double_t likeChi2TC = (fReconstructor->GetRecoParam() ->IsVertexConstrained()) ?
d20df6fc 2811 TMath::Exp(-chi2[1] * 0.677) : 1; // Constrained Tilted Riemann
41702fec 2812 Double_t likeChi2TR = TMath::Exp(-chi2[0] * 0.78); // Non-constrained Tilted Riemann
2813 Double_t likeAF = TMath::Exp(-sumdaf * 3.23);
2814 Double_t trackLikelihood = likeChi2Z * likeChi2TR * likeAF;
2815
3a039a31 2816 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){
41702fec 2817 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2818 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
29f95561 2819 TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
41702fec 2820 cstreamer << "CalculateTrackLikelihood0"
2821 << "EventNumber=" << eventNumber
2822 << "CandidateNumber=" << candidateNumber
2823 << "LikeChi2Z=" << likeChi2Z
2824 << "LikeChi2TR=" << likeChi2TR
2825 << "LikeChi2TC=" << likeChi2TC
2826 << "LikeAF=" << likeAF
2827 << "TrackLikelihood=" << trackLikelihood
2828 << "\n";
2829 }
2830
2831 return trackLikelihood;
e4f2f73d 2832}
2833
2834//____________________________________________________________________
91834b8d 2835Double_t AliTRDtrackerV1::CookLikelihood(AliTRDseedV1 *cseed, Int_t planes[4])
e4f2f73d 2836{
41702fec 2837 //
2838 // Calculate the probability of this track candidate.
2839 //
2840 // Parameters :
2841 // cseeds : array of candidate tracklets
2842 // planes : array of seeding planes (see seeding configuration)
2843 // chi2 : chi2 values (on the Z and Y direction) from the rieman fit of the track.
2844 //
2845 // Output :
2846 // likelihood value
2847 //
2848 // Detailed description
2849 //
2850 // The track quality is estimated based on the following 4 criteria:
2851 // 1. precision of the rieman fit on the Y direction (likea)
2852 // 2. chi2 on the Y direction (likechi2y)
2853 // 3. chi2 on the Z direction (likechi2z)
2854 // 4. number of attached clusters compared to a reference value
2855 // (see AliTRDrecoParam::fkFindable) (likeN)
2856 //
2857 // The distributions for each type of probabilities are given below as of
2858 // (date). They have to be checked to assure consistency of estimation.
2859 //
2860
2861 // ratio of the total number of clusters/track which are expected to be found by the tracker.
91834b8d 2862 const AliTRDrecoParam *fRecoPars = fReconstructor->GetRecoParam();
41702fec 2863
91834b8d 2864 Double_t chi2y = GetChi2Y(&cseed[0]);
2865 Double_t chi2z = GetChi2Z(&cseed[0]);
2866
8ae98148 2867 Float_t nclusters = 0.;
41702fec 2868 Double_t sumda = 0.;
2869 for(UChar_t ilayer = 0; ilayer < 4; ilayer++){
2870 Int_t jlayer = planes[ilayer];
2871 nclusters += cseed[jlayer].GetN2();
2872 sumda += TMath::Abs(cseed[jlayer].GetYfitR(1) - cseed[jlayer].GetYref(1));
2873 }
8ae98148 2874 nclusters *= .25;
2875
5a2e200c 2876 Double_t likea = TMath::Exp(-sumda * fRecoPars->GetPhiSlope());
41702fec 2877 Double_t likechi2y = 0.0000000001;
5a2e200c 2878 if (fReconstructor->IsCosmic() || chi2y < fRecoPars->GetChi2YCut()) likechi2y += TMath::Exp(-TMath::Sqrt(chi2y) * fRecoPars->GetChi2YSlope());
2879 Double_t likechi2z = TMath::Exp(-chi2z * fRecoPars->GetChi2ZSlope());
8ae98148 2880 Double_t likeN = TMath::Exp(-(fRecoPars->GetNMeanClusters() - nclusters) / fRecoPars->GetNSigmaClusters());
41702fec 2881 Double_t like = likea * likechi2y * likechi2z * likeN;
2882
2883 // 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 2884 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){
41702fec 2885 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2886 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
91834b8d 2887 Int_t nTracklets = 0; Float_t mean_ncls = 0;
2888 for(Int_t iseed=0; iseed < kNPlanes; iseed++){
2889 if(!cseed[iseed].IsOK()) continue;
2890 nTracklets++;
2891 mean_ncls += cseed[iseed].GetN2();
2892 }
2893 if(nTracklets) mean_ncls /= nTracklets;
41702fec 2894 // The Debug Stream contains the seed
29f95561 2895 TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
41702fec 2896 cstreamer << "CookLikelihood"
2897 << "EventNumber=" << eventNumber
2898 << "CandidateNumber=" << candidateNumber
2899 << "tracklet0.=" << &cseed[0]
2900 << "tracklet1.=" << &cseed[1]
2901 << "tracklet2.=" << &cseed[2]
2902 << "tracklet3.=" << &cseed[3]
2903 << "tracklet4.=" << &cseed[4]
2904 << "tracklet5.=" << &cseed[5]
2905 << "sumda=" << sumda
91834b8d 2906 << "chi2y=" << chi2y
2907 << "chi2z=" << chi2z
41702fec 2908 << "likea=" << likea
2909 << "likechi2y=" << likechi2y
2910 << "likechi2z=" << likechi2z
2911 << "nclusters=" << nclusters
2912 << "likeN=" << likeN
2913 << "like=" << like
91834b8d 2914 << "meanncls=" << mean_ncls
41702fec 2915 << "\n";
2916 }
2917
2918 return like;
e4f2f73d 2919}
2920
e4f2f73d 2921//____________________________________________________________________
0906e73e 2922void AliTRDtrackerV1::GetSeedingConfig(Int_t iconfig, Int_t planes[4])
e4f2f73d 2923{
41702fec 2924 //
2925 // Map seeding configurations to detector planes.
2926 //
2927 // Parameters :
2928 // iconfig : configuration index
2929 // planes : member planes of this configuration. On input empty.
2930 //
2931 // Output :
2932 // planes : contains the planes which are defining the configuration
2933 //
2934 // Detailed description
2935 //
2936 // Here is the list of seeding planes configurations together with
2937 // their topological classification:
2938 //
2939 // 0 - 5432 TQ 0
2940 // 1 - 4321 TQ 0
2941 // 2 - 3210 TQ 0
2942 // 3 - 5321 TQ 1
2943 // 4 - 4210 TQ 1
2944 // 5 - 5431 TQ 1
2945 // 6 - 4320 TQ 1
2946 // 7 - 5430 TQ 2
2947 // 8 - 5210 TQ 2
2948 // 9 - 5421 TQ 3
2949 // 10 - 4310 TQ 3
2950 // 11 - 5410 TQ 4
2951 // 12 - 5420 TQ 5
2952 // 13 - 5320 TQ 5
2953 // 14 - 5310 TQ 5
2954 //
2955 // The topologic quality is modeled as follows:
2956 // 1. The general model is define by the equation:
2957 // p(conf) = exp(-conf/2)
2958 // 2. According to the topologic classification, configurations from the same
2959 // class are assigned the agerage value over the model values.
2960 // 3. Quality values are normalized.
2961 //
2962 // The topologic quality distribution as function of configuration is given below:
2963 //Begin_Html
2964 // <img src="gif/topologicQA.gif">
2965 //End_Html
2966 //
2967
2968 switch(iconfig){
2969 case 0: // 5432 TQ 0
2970 planes[0] = 2;
2971 planes[1] = 3;
2972 planes[2] = 4;
2973 planes[3] = 5;
2974 break;
2975 case 1: // 4321 TQ 0
2976 planes[0] = 1;
2977 planes[1] = 2;
2978 planes[2] = 3;
2979 planes[3] = 4;
2980 break;
2981 case 2: // 3210 TQ 0
2982 planes[0] = 0;
2983 planes[1] = 1;
2984 planes[2] = 2;
2985 planes[3] = 3;
2986 break;
2987 case 3: // 5321 TQ 1
2988 planes[0] = 1;
2989 planes[1] = 2;
2990 planes[2] = 3;
2991 planes[3] = 5;
2992 break;
2993 case 4: // 4210 TQ 1
2994 planes[0] = 0;
2995 planes[1] = 1;
2996 planes[2] = 2;
2997 planes[3] = 4;
2998 break;
2999 case 5: // 5431 TQ 1
3000 planes[0] = 1;
3001 planes[1] = 3;
3002 planes[2] = 4;
3003 planes[3] = 5;
3004 break;
3005 case 6: // 4320 TQ 1
3006 planes[0] = 0;
3007 planes[1] = 2;
3008 planes[2] = 3;
3009 planes[3] = 4;
3010 break;
3011 case 7: // 5430 TQ 2
3012 planes[0] = 0;
3013 planes[1] = 3;
3014 planes[2] = 4;
3015 planes[3] = 5;
3016 break;
3017 case 8: // 5210 TQ 2
3018 planes[0] = 0;
3019 planes[1] = 1;
3020 planes[2] = 2;
3021 planes[3] = 5;
3022 break;
3023 case 9: // 5421 TQ 3
3024 planes[0] = 1;
3025 planes[1] = 2;
3026 planes[2] = 4;
3027 planes[3] = 5;
3028 break;
3029 case 10: // 4310 TQ 3
3030 planes[0] = 0;
3031 planes[1] = 1;
3032 planes[2] = 3;
3033 planes[3] = 4;
3034 break;
3035 case 11: // 5410 TQ 4
3036 planes[0] = 0;
3037 planes[1] = 1;
3038 planes[2] = 4;
3039 planes[3] = 5;
3040 break;
3041 case 12: // 5420 TQ 5
3042 planes[0] = 0;
3043 planes[1] = 2;
3044 planes[2] = 4;
3045 planes[3] = 5;
3046 break;
3047 case 13: // 5320 TQ 5
3048 planes[0] = 0;
3049 planes[1] = 2;
3050 planes[2] = 3;
3051 planes[3] = 5;
3052 break;
3053 case 14: // 5310 TQ 5
3054 planes[0] = 0;
3055 planes[1] = 1;
3056 planes[2] = 3;
3057 planes[3] = 5;
3058 break;
3059 }
e4f2f73d 3060}
3061
3062//____________________________________________________________________
0906e73e 3063void AliTRDtrackerV1::GetExtrapolationConfig(Int_t iconfig, Int_t planes[2])
e4f2f73d 3064{
41702fec 3065 //
3066 // Returns the extrapolation planes for a seeding configuration.
3067 //
3068 // Parameters :
3069 // iconfig : configuration index
3070 // planes : planes which are not in this configuration. On input empty.
3071 //
3072 // Output :
3073 // planes : contains the planes which are not in the configuration
3074 //
3075 // Detailed description
3076 //
3077
3078 switch(iconfig){
3079 case 0: // 5432 TQ 0
3080 planes[0] = 1;
3081 planes[1] = 0;
3082 break;
3083 case 1: // 4321 TQ 0
3084 planes[0] = 5;
3085 planes[1] = 0;
3086 break;
3087 case 2: // 3210 TQ 0
3088 planes[0] = 4;
3089 planes[1] = 5;
3090 break;
3091 case 3: // 5321 TQ 1
3092 planes[0] = 4;
3093 planes[1] = 0;
3094 break;
3095 case 4: // 4210 TQ 1
3096 planes[0] = 5;
3097 planes[1] = 3;
3098 break;
3099 case 5: // 5431 TQ 1
3100 planes[0] = 2;
3101 planes[1] = 0;
3102 break;
3103 case 6: // 4320 TQ 1
3104 planes[0] = 5;
3105 planes[1] = 1;
3106 break;
3107 case 7: // 5430 TQ 2
3108 planes[0] = 2;
3109 planes[1] = 1;
3110 break;
3111 case 8: // 5210 TQ 2
3112 planes[0] = 4;
3113 planes[1] = 3;
3114 break;
3115 case 9: // 5421 TQ 3
3116 planes[0] = 3;
3117 planes[1] = 0;
3118 break;
3119 case 10: // 4310 TQ 3
3120 planes[0] = 5;
3121 planes[1] = 2;
3122 break;
3123 case 11: // 5410 TQ 4
3124 planes[0] = 3;
3125 planes[1] = 2;
3126 break;
3127 case 12: // 5420 TQ 5
3128 planes[0] = 3;
3129 planes[1] = 1;
3130 break;
3131 case 13: // 5320 TQ 5
3132 planes[0] = 4;
3133 planes[1] = 1;
3134 break;
3135 case 14: // 5310 TQ 5
3136 planes[0] = 4;
3137 planes[1] = 2;
3138 break;
3139 }
e4f2f73d 3140}
eb38ed55 3141
3142//____________________________________________________________________
3143AliCluster* AliTRDtrackerV1::GetCluster(Int_t idx) const
3144{
41702fec 3145 Int_t ncls = fClusters->GetEntriesFast();
2f7514a6 3146 return idx >= 0 && idx < ncls ? (AliCluster*)fClusters->UncheckedAt(idx) : 0x0;
eb38ed55 3147}
3148
bb56afff 3149//____________________________________________________________________
3b57a3f7 3150AliTRDseedV1* AliTRDtrackerV1::GetTracklet(Int_t idx) const
3151{
41702fec 3152 Int_t ntrklt = fTracklets->GetEntriesFast();
2f7514a6 3153 return idx >= 0 && idx < ntrklt ? (AliTRDseedV1*)fTracklets->UncheckedAt(idx) : 0x0;
3b57a3f7 3154}
3155
3156//____________________________________________________________________
3157AliKalmanTrack* AliTRDtrackerV1::GetTrack(Int_t idx) const
3158{
41702fec 3159 Int_t ntrk = fTracks->GetEntriesFast();
2f7514a6 3160 return idx >= 0 && idx < ntrk ? (AliKalmanTrack*)fTracks->UncheckedAt(idx) : 0x0;
3b57a3f7 3161}
3162
3163//____________________________________________________________________
bb56afff 3164Float_t AliTRDtrackerV1::CalculateReferenceX(AliTRDseedV1 *tracklets){
41702fec 3165 //
3166 // Calculates the reference x-position for the tilted Rieman fit defined as middle
3167 // of the stack (middle between layers 2 and 3). For the calculation all the tracklets
3168 // are taken into account
3169 //
3170 // Parameters: - Array of tracklets(AliTRDseedV1)
3171 //
3172 // Output: - The reference x-position(Float_t)
3173 //
3174 Int_t nDistances = 0;
3175 Float_t meanDistance = 0.;
3176 Int_t startIndex = 5;
3177 for(Int_t il =5; il > 0; il--){
3178 if(tracklets[il].IsOK() && tracklets[il -1].IsOK()){
3179 Float_t xdiff = tracklets[il].GetX0() - tracklets[il -1].GetX0();
3180 meanDistance += xdiff;
3181 nDistances++;
3182 }
3183 if(tracklets[il].IsOK()) startIndex = il;
3184 }
3185 if(tracklets[0].IsOK()) startIndex = 0;
3186 if(!nDistances){
3187 // We should normally never get here
3188 Float_t xpos[2]; memset(xpos, 0, sizeof(Float_t) * 2);
3189 Int_t iok = 0, idiff = 0;
3190 // This attempt is worse and should be avoided:
3191 // check for two chambers which are OK and repeat this without taking the mean value
3192 // Strategy avoids a division by 0;
3193 for(Int_t il = 5; il >= 0; il--){
3194 if(tracklets[il].IsOK()){
3195 xpos[iok] = tracklets[il].GetX0();
3196 iok++;
3197 startIndex = il;
3198 }
3199 if(iok) idiff++; // to get the right difference;
3200 if(iok > 1) break;
3201 }
3202 if(iok > 1){
3203 meanDistance = (xpos[0] - xpos[1])/idiff;
3204 }
3205 else{
3206 // we have do not even have 2 layers which are OK? The we do not need to fit at all
3207 return 331.;
3208 }
3209 }
3210 else{
3211 meanDistance /= nDistances;
3212 }
3213 return tracklets[startIndex].GetX0() + (2.5 - startIndex) * meanDistance - 0.5 * (AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick());
bb56afff 3214}
eb38ed55 3215
3216//_____________________________________________________________________________
3217Int_t AliTRDtrackerV1::Freq(Int_t n, const Int_t *inlist
41702fec 3218 , Int_t *outlist, Bool_t down)
eb38ed55 3219{
41702fec 3220 //
3221 // Sort eleements according occurancy
3222 // The size of output array has is 2*n
3223 //
3224
3225 if (n <= 0) {
3226 return 0;
3227 }
3228
3229 Int_t *sindexS = new Int_t[n]; // Temporary array for sorting
3230 Int_t *sindexF = new Int_t[2*n];
3231 for (Int_t i = 0; i < n; i++) {
3232 sindexF[i] = 0;
3233 }
3234
3235 TMath::Sort(n,inlist,sindexS,down);
3236
3237 Int_t last = inlist[sindexS[0]];
3238 Int_t val = last;
3239 sindexF[0] = 1;
3240 sindexF[0+n] = last;
3241 Int_t countPos = 0;
3242
3243 // Find frequency
3244 for (Int_t i = 1; i < n; i++) {
3245 val = inlist[sindexS[i]];
3246 if (last == val) {
3247 sindexF[countPos]++;
3248 }
3249 else {
3250 countPos++;
3251 sindexF[countPos+n] = val;
3252 sindexF[countPos]++;
3253 last = val;
3254 }
3255 }
3256 if (last == val) {
3257 countPos++;
3258 }
3259
3260 // Sort according frequency
3261 TMath::Sort(countPos,sindexF,sindexS,kTRUE);
3262
3263 for (Int_t i = 0; i < countPos; i++) {
3264 outlist[2*i ] = sindexF[sindexS[i]+n];
3265 outlist[2*i+1] = sindexF[sindexS[i]];
3266 }
3267
3268 delete [] sindexS;
3269 delete [] sindexF;
3270
3271 return countPos;
eb38ed55 3272
3273}
bb56afff 3274
06b32d95 3275
3276//____________________________________________________________________
acd241e9 3277
bb56afff 3278//_____________________________________________________________________________
3279Float_t AliTRDtrackerV1::GetChi2Y(AliTRDseedV1 *tracklets) const
3280{
41702fec 3281 // Chi2 definition on y-direction
3282
3283 Float_t chi2 = 0;
3284 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
3285 if(!tracklets[ipl].IsOK()) continue;
91834b8d 3286 Double_t distLayer = (tracklets[ipl].GetYfit(0) - tracklets[ipl].GetYref(0));// /tracklets[ipl].GetSigmaY();
41702fec 3287 chi2 += distLayer * distLayer;
3288 }
3289 return chi2;
bb56afff 3290}
3291
d611c74f 3292//____________________________________________________________________
3293void AliTRDtrackerV1::ResetSeedTB()
3294{
3295// reset buffer for seeding time bin layers. If the time bin
3296// layers are not allocated this function allocates them
3297
3298 for(Int_t isl=0; isl<kNSeedPlanes; isl++){
3299 if(!fSeedTB[isl]) fSeedTB[isl] = new AliTRDchamberTimeBin();
3300 else fSeedTB[isl]->Clear();
3301 }
3302}
3303
bb56afff 3304//_____________________________________________________________________________
3305Float_t AliTRDtrackerV1::GetChi2Z(AliTRDseedV1 *tracklets) const
3306{
91834b8d 3307 // Calculates normalized chi2 in z-direction
41702fec 3308
3309 Float_t chi2 = 0;
91834b8d 3310 // chi2 = Sum ((z - zmu)/sigma)^2
3311 // Sigma for the z direction is defined as half of the padlength
41702fec 3312 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
3313 if(!tracklets[ipl].IsOK()) continue;
91834b8d 3314 Double_t distLayer = (tracklets[ipl].GetMeanz() - tracklets[ipl].GetZref(0)); // /(tracklets[ipl].GetPadLength()/2);
41702fec 3315 chi2 += distLayer * distLayer;
3316 }
3317 return chi2;
bb56afff 3318}
8acca6a3 3319
3320///////////////////////////////////////////////////////
3321// //
3322// Resources of class AliTRDLeastSquare //
3323// //
3324///////////////////////////////////////////////////////
3325
3326//_____________________________________________________________________________
3327AliTRDtrackerV1::AliTRDLeastSquare::AliTRDLeastSquare(){
41702fec 3328 //
3329 // Constructor of the nested class AliTRDtrackFitterLeastSquare
3330 //
3331 memset(fParams, 0, sizeof(Double_t) * 2);
3332 memset(fSums, 0, sizeof(Double_t) * 5);
3333 memset(fCovarianceMatrix, 0, sizeof(Double_t) * 3);
8acca6a3 3334
3335}
3336
3337//_____________________________________________________________________________
3338void AliTRDtrackerV1::AliTRDLeastSquare::AddPoint(Double_t *x, Double_t y, Double_t sigmaY){
41702fec 3339 //
3340 // Adding Point to the fitter
3341 //
3342 Double_t weight = 1/(sigmaY * sigmaY);
3343 Double_t &xpt = *x;
3344 // printf("Adding point x = %f, y = %f, sigma = %f\n", xpt, y, sigmaY);
3345 fSums[0] += weight;
3346 fSums[1] += weight * xpt;
3347 fSums[2] += weight * y;
3348 fSums[3] += weight * xpt * y;
3349 fSums[4] += weight * xpt * xpt;
3350 fSums[5] += weight * y * y;
8acca6a3 3351}
3352
3353//_____________________________________________________________________________
3354void AliTRDtrackerV1::AliTRDLeastSquare::RemovePoint(Double_t *x, Double_t y, Double_t sigmaY){
41702fec 3355 //
3356 // Remove Point from the sample
3357 //
3358 Double_t weight = 1/(sigmaY * sigmaY);
3359 Double_t &xpt = *x;
3360 fSums[0] -= weight;
3361 fSums[1] -= weight * xpt;
3362 fSums[2] -= weight * y;
3363 fSums[3] -= weight * xpt * y;
3364 fSums[4] -= weight * xpt * xpt;
3365 fSums[5] -= weight * y * y;
8acca6a3 3366}
3367
3368//_____________________________________________________________________________
3369void AliTRDtrackerV1::AliTRDLeastSquare::Eval(){
41702fec 3370 //
3371 // Evaluation of the fit:
3372 // Calculation of the parameters
3373 // Calculation of the covariance matrix
3374 //
3375
3376 Double_t denominator = fSums[0] * fSums[4] - fSums[1] *fSums[1];
aec26713 3377 if(denominator==0) return;
3378
41702fec 3379 // for(Int_t isum = 0; isum < 5; isum++)
3380 // printf("fSums[%d] = %f\n", isum, fSums[isum]);
3381 // printf("denominator = %f\n", denominator);
3382 fParams[0] = (fSums[2] * fSums[4] - fSums[1] * fSums[3])/ denominator;
3383 fParams[1] = (fSums[0] * fSums[3] - fSums[1] * fSums[2]) / denominator;
3384 // printf("fParams[0] = %f, fParams[1] = %f\n", fParams[0], fParams[1]);
3385
3386 // Covariance matrix
3387 fCovarianceMatrix[0] = fSums[4] - fSums[1] * fSums[1] / fSums[0];
3388 fCovarianceMatrix[1] = fSums[5] - fSums[2] * fSums[2] / fSums[0];
3389 fCovarianceMatrix[2] = fSums[3] - fSums[1] * fSums[2] / fSums[0];
8acca6a3 3390}
3391
46b6abd7 3392//_____________________________________________________________________________
3393Double_t AliTRDtrackerV1::AliTRDLeastSquare::GetFunctionValue(Double_t *xpos) const {
41702fec 3394 //
3395 // Returns the Function value of the fitted function at a given x-position
3396 //
3397 return fParams[0] + fParams[1] * (*xpos);
46b6abd7 3398}
3399
3400//_____________________________________________________________________________
3401void AliTRDtrackerV1::AliTRDLeastSquare::GetCovarianceMatrix(Double_t *storage) const {
41702fec 3402 //
3403 // Copies the values of the covariance matrix into the storage
3404 //
3405 memcpy(storage, fCovarianceMatrix, sizeof(Double_t) * 3);
46b6abd7 3406}
3407