Reverting previous commit as it breaks compilation
[u/mrichter/AliRoot.git] / MUON / AliMUONVTrackReconstructor.cxx
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8d0843c6 1/**************************************************************************
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 **************************************************************************/
15
16/* $Id$ */
17
3d1463c8 18//-----------------------------------------------------------------------------
c4ee792d 19/// \class AliMUONVTrackReconstructor
06ca6d7b 20/// Virtual MUON track reconstructor in ALICE (class renamed from AliMUONEventReconstructor)
21///
96ebe67e 22/// This class contains as data a pointer to the array of reconstructed tracks
06ca6d7b 23///
24/// It contains as methods, among others:
25/// * EventReconstruct to build the muon tracks
26/// * EventReconstructTrigger to build the trigger tracks
96ebe67e 27/// * ValidateTracksWithTrigger to match tracker/trigger tracks
06ca6d7b 28///
96ebe67e 29/// Several options and adjustable parameters are available for both KALMAN and ORIGINAL
ad3c6eda 30/// tracking algorithms. They can be changed through the AliMUONRecoParam object
31/// set in the reconstruction macro or read from the CDB
32/// (see methods in AliMUONRecoParam.h file for details)
96ebe67e 33///
34/// Main parameters and options are:
dfb547bf 35/// - *fgkSigmaToCutForTracking* : quality cut used to select new clusters to be
36/// attached to the track candidate and to select good tracks.
019df241 37/// - *fgkMakeTrackCandidatesFast* : if this flag is set to 'true', the track candidates
38/// are made assuming linear propagation between stations 4 and 5.
dfb547bf 39/// - *fgkTrackAllTracks* : according to the value of this flag, in case that several
40/// new clusters pass the quality cut, either we consider all the possibilities
41/// (duplicating tracks) or we attach only the best cluster.
42/// - *fgkRecoverTracks* : if this flag is set to 'true', we try to recover the tracks
43/// lost during the tracking by removing the worst of the 2 clusters attached in the
44/// previous station.
45/// - *fgkImproveTracks* : if this flag is set to 'true', we try to improve the quality
46/// of the tracks at the end of the tracking by removing clusters that do not pass
3304fa09 47/// new quality cut (the track is removed is it does not contain enough cluster anymore).
48/// - *fgkComplementTracks* : if this flag is set to 'true', we try to improve the quality
49/// of the tracks at the end of the tracking by adding potentially missing clusters
50/// (we may have 2 clusters in the same chamber because of the overlapping of detection
51/// elements, which is not handle by the tracking algorithm).
dfb547bf 52/// - *fgkSigmaToCutForImprovement* : quality cut used when we try to improve the
53/// quality of the tracks.
54///
c4ee792d 55/// \author Philippe Pillot
3d1463c8 56//-----------------------------------------------------------------------------
8d0843c6 57
8d0843c6 58#include "AliMUONVTrackReconstructor.h"
7ec3b9cf 59
8d0843c6 60#include "AliMUONConstants.h"
208f139e 61#include "AliMUONObjectPair.h"
8d0843c6 62#include "AliMUONTriggerTrack.h"
e1a10d41 63#include "AliMUONTriggerCircuit.h"
8d0843c6 64#include "AliMUONLocalTrigger.h"
65#include "AliMUONGlobalTrigger.h"
8d0843c6 66#include "AliMUONTrack.h"
37827b29 67#include "AliMUONTrackParam.h"
68#include "AliMUONTrackExtrap.h"
7771752e 69#include "AliMUONTrackHitPattern.h"
7ec3b9cf 70#include "AliMUONVTrackStore.h"
71#include "AliMUONVClusterStore.h"
2060b217 72#include "AliMUONVCluster.h"
1fef78c8 73#include "AliMUONVClusterServer.h"
7ec3b9cf 74#include "AliMUONVTriggerStore.h"
75#include "AliMUONVTriggerTrackStore.h"
5a240757 76#include "AliMUONRecoParam.h"
77
ea94c18b 78#include "AliMpDEManager.h"
1fef78c8 79#include "AliMpArea.h"
ea94c18b 80
81#include "AliLog.h"
b709ac13 82#include "AliCodeTimer.h"
ea94c18b 83#include "AliTracker.h"
8d0843c6 84
4889d34c 85#include <TClonesArray.h>
86#include <TMath.h>
ea94c18b 87#include <TMatrixD.h>
1fef78c8 88#include <TVector2.h>
ea94c18b 89
90#include <Riostream.h>
4889d34c 91
78649106 92/// \cond CLASSIMP
8d0843c6 93ClassImp(AliMUONVTrackReconstructor) // Class implementation in ROOT context
78649106 94/// \endcond
8d0843c6 95
ea94c18b 96 //__________________________________________________________________________
a0dc65b4 97AliMUONVTrackReconstructor::AliMUONVTrackReconstructor(const AliMUONRecoParam* recoParam,
98 AliMUONVClusterServer* clusterServer)
99: TObject(),
100fRecTracksPtr(0x0),
101fNRecTracks(0),
102fClusterServer(clusterServer),
6b191dea 103fkRecoParam(recoParam),
104fMaxMCSAngle2(0.)
8d0843c6 105{
106 /// Constructor for class AliMUONVTrackReconstructor
b1fea02e 107 /// WARNING: if clusterServer=0x0, no clusterization will be possible at this level
ea94c18b 108
109 // Memory allocation for the TClonesArray of reconstructed tracks
96ebe67e 110 fRecTracksPtr = new TClonesArray("AliMUONTrack", 100);
7ec3b9cf 111
208f139e 112 // set the magnetic field for track extrapolations
f7a1cc68 113 AliMUONTrackExtrap::SetField();
6b191dea 114
115 // set the maximum MCS angle in chamber from the minimum acceptable momentum
116 AliMUONTrackParam param;
117 Double_t inverseBendingP = (GetRecoParam()->GetMinBendingMomentum() > 0.) ? 1./GetRecoParam()->GetMinBendingMomentum() : 1.;
118 param.SetInverseBendingMomentum(inverseBendingP);
119 fMaxMCSAngle2 = AliMUONTrackExtrap::GetMCSAngle2(param, AliMUONConstants::ChamberThicknessInX0(), 1.);
120
8d0843c6 121}
122
123 //__________________________________________________________________________
ea94c18b 124AliMUONVTrackReconstructor::~AliMUONVTrackReconstructor()
8d0843c6 125{
126 /// Destructor for class AliMUONVTrackReconstructor
ea94c18b 127 delete fRecTracksPtr;
8d0843c6 128}
129
ea94c18b 130 //__________________________________________________________________________
ea94c18b 131void AliMUONVTrackReconstructor::ResetTracks()
132{
133 /// To reset the TClonesArray of reconstructed tracks
134 if (fRecTracksPtr) fRecTracksPtr->Clear("C");
135 fNRecTracks = 0;
136 return;
137}
138
139 //__________________________________________________________________________
1fef78c8 140void AliMUONVTrackReconstructor::EventReconstruct(AliMUONVClusterStore& clusterStore, AliMUONVTrackStore& trackStore)
ea94c18b 141{
142 /// To reconstruct one event
143 AliDebug(1,"");
70d92702 144 AliCodeTimerAuto("",);
ea94c18b 145
96ebe67e 146 // Reset array of tracks
ea94c18b 147 ResetTracks();
2060b217 148
89c8d66d 149 // Look for candidates from clusters in stations(1..) 4 and 5 (abort in case of failure)
150 if (!MakeTrackCandidates(clusterStore)) return;
96ebe67e 151
89c8d66d 152 // Look for extra candidates from clusters in stations(1..) 4 and 5 (abort in case of failure)
153 if (GetRecoParam()->MakeMoreTrackCandidates()) {
154 if (!MakeMoreTrackCandidates(clusterStore)) return;
155 }
9bf6860b 156
96ebe67e 157 // Stop tracking if no candidate found
ea94c18b 158 if (fRecTracksPtr->GetEntriesFast() == 0) return;
96ebe67e 159
89c8d66d 160 // Follow tracks in stations(1..) 3, 2 and 1 (abort in case of failure)
161 if (!FollowTracks(clusterStore)) return;
96ebe67e 162
b709ac13 163 // Complement the reconstructed tracks
89c8d66d 164 if (GetRecoParam()->ComplementTracks()) {
165 if (ComplementTracks(clusterStore)) RemoveIdenticalTracks();
166 }
96ebe67e 167
ea94c18b 168 // Improve the reconstructed tracks
a0dc65b4 169 if (GetRecoParam()->ImproveTracks()) ImproveTracks();
96ebe67e 170
c59f70b9 171 // Remove connected tracks
172 if (GetRecoParam()->RemoveConnectedTracksInSt12()) RemoveConnectedTracks(kFALSE);
173 else RemoveConnectedTracks(kTRUE);
96ebe67e 174
ea94c18b 175 // Fill AliMUONTrack data members
176 Finalize();
96ebe67e 177
178 // Add tracks to MUON data container
179 for (Int_t i=0; i<fNRecTracks; ++i)
180 {
181 AliMUONTrack * track = (AliMUONTrack*) fRecTracksPtr->At(i);
4ea3f013 182 if (track->GetGlobalChi2() < AliMUONTrack::MaxChi2()) {
183 track->SetUniqueID(i+1);
184 trackStore.Add(*track);
185 } else AliWarning("problem occur somewhere during track refitting --> discard track");
96ebe67e 186 }
ea94c18b 187}
188
6b191dea 189//__________________________________________________________________________
190Bool_t AliMUONVTrackReconstructor::IsAcceptable(AliMUONTrackParam &trackParam)
191{
192 /// Return kTRUE if the track is within given limits on momentum/angle/origin
193
194 const TMatrixD& kParamCov = trackParam.GetCovariances();
195 Int_t chamber = trackParam.GetClusterPtr()->GetChamberId();
196 Double_t z = trackParam.GetZ();
197 Double_t sigmaCut = GetRecoParam()->GetSigmaCutForTracking();
198
199 // MCS dipersion
200 Double_t angleMCS2 = 0.;
201 if (AliMUONTrackExtrap::IsFieldON() && chamber < 6)
202 angleMCS2 = AliMUONTrackExtrap::GetMCSAngle2(trackParam, AliMUONConstants::ChamberThicknessInX0(), 1.);
203 else angleMCS2 = fMaxMCSAngle2;
204 Double_t impactMCS2 = 0.;
205 if (!GetRecoParam()->SelectOnTrackSlope()) for (Int_t iCh=0; iCh<=chamber; iCh++)
206 impactMCS2 += AliMUONConstants::DefaultChamberZ(chamber) * AliMUONConstants::DefaultChamberZ(chamber) * angleMCS2;
207
208 // ------ track selection in non bending direction ------
209 if (GetRecoParam()->SelectOnTrackSlope()) {
210
211 // check if non bending slope is within tolerances
212 Double_t nonBendingSlopeErr = TMath::Sqrt(kParamCov(1,1) + (chamber + 1.) * angleMCS2);
213 if ((TMath::Abs(trackParam.GetNonBendingSlope()) - sigmaCut * nonBendingSlopeErr) > GetRecoParam()->GetMaxNonBendingSlope()) return kFALSE;
214
215 } else {
216
217 // or check if non bending impact parameter is within tolerances
218 Double_t nonBendingImpactParam = TMath::Abs(trackParam.GetNonBendingCoor() - z * trackParam.GetNonBendingSlope());
219 Double_t nonBendingImpactParamErr = TMath::Sqrt(kParamCov(0,0) + z * z * kParamCov(1,1) - 2. * z * kParamCov(0,1) + impactMCS2);
220 if ((nonBendingImpactParam - sigmaCut * nonBendingImpactParamErr) > (3. * GetRecoParam()->GetNonBendingVertexDispersion())) return kFALSE;
221
222 }
223
224 // ------ track selection in bending direction ------
225 if (AliMUONTrackExtrap::IsFieldON()) { // depending whether the field is ON or OFF
226
227 // check if bending momentum is within tolerances
228 Double_t bendingMomentum = TMath::Abs(1. / trackParam.GetInverseBendingMomentum());
229 Double_t bendingMomentumErr = TMath::Sqrt(kParamCov(4,4)) * bendingMomentum * bendingMomentum;
230 if (chamber < 6 && (bendingMomentum + sigmaCut * bendingMomentumErr) < GetRecoParam()->GetMinBendingMomentum()) return kFALSE;
231 else if ((bendingMomentum + 3. * bendingMomentumErr) < GetRecoParam()->GetMinBendingMomentum()) return kFALSE;
232
233 } else {
234
235 if (GetRecoParam()->SelectOnTrackSlope()) {
236
237 // check if bending slope is within tolerances
238 Double_t bendingSlopeErr = TMath::Sqrt(kParamCov(3,3) + (chamber + 1.) * angleMCS2);
239 if ((TMath::Abs(trackParam.GetBendingSlope()) - sigmaCut * bendingSlopeErr) > GetRecoParam()->GetMaxBendingSlope()) return kFALSE;
240
241 } else {
242
243 // or check if bending impact parameter is within tolerances
244 Double_t bendingImpactParam = TMath::Abs(trackParam.GetBendingCoor() - z * trackParam.GetBendingSlope());
245 Double_t bendingImpactParamErr = TMath::Sqrt(kParamCov(2,2) + z * z * kParamCov(3,3) - 2. * z * kParamCov(2,3) + impactMCS2);
246 if ((bendingImpactParam - sigmaCut * bendingImpactParamErr) > (3. * GetRecoParam()->GetBendingVertexDispersion())) return kFALSE;
247
248 }
249
250 }
251
252 return kTRUE;
253
254}
255
256//__________________________________________________________________________
9bf6860b 257TClonesArray* AliMUONVTrackReconstructor::MakeSegmentsBetweenChambers(const AliMUONVClusterStore& clusterStore, Int_t ch1, Int_t ch2)
8d0843c6 258{
9bf6860b 259 /// To make the list of segments from the list of clusters in the 2 given chambers.
208f139e 260 /// Return a new TClonesArray of segments.
261 /// It is the responsibility of the user to delete it afterward.
9bf6860b 262 AliDebug(1,Form("Enter MakeSegmentsBetweenChambers (1..) %d-%d", ch1+1, ch2+1));
70d92702 263 AliCodeTimerAuto("",);
208f139e 264
96ebe67e 265 AliMUONVCluster *cluster1, *cluster2;
208f139e 266 AliMUONObjectPair *segment;
6b191dea 267 Double_t z1 = 0., z2 = 0., dZ = 0.;
268 Double_t nonBendingSlope = 0., nonBendingSlopeErr = 0., nonBendingImpactParam = 0., nonBendingImpactParamErr = 0.;
269 Double_t bendingSlope = 0., bendingSlopeErr = 0., bendingImpactParam = 0., bendingImpactParamErr = 0., bendingImpactParamErr2 = 0.;
270 Double_t bendingMomentum = 0., bendingMomentumErr = 0.;
271 Double_t bendingVertexDispersion2 = GetRecoParam()->GetBendingVertexDispersion() * GetRecoParam()->GetBendingVertexDispersion();
272 Double_t impactMCS2 = 0; // maximum impact parameter dispersion**2 due to MCS in chamber
273 if (!GetRecoParam()->SelectOnTrackSlope() || AliMUONTrackExtrap::IsFieldON()) for (Int_t iCh=0; iCh<=ch1; iCh++)
274 impactMCS2 += AliMUONConstants::DefaultChamberZ(iCh) * AliMUONConstants::DefaultChamberZ(iCh) * fMaxMCSAngle2;
275 Double_t sigmaCut = GetRecoParam()->GetSigmaCutForTracking();
7ec3b9cf 276
96ebe67e 277 // Create iterators to loop over clusters in both chambers
278 TIter nextInCh1(clusterStore.CreateChamberIterator(ch1,ch1));
279 TIter nextInCh2(clusterStore.CreateChamberIterator(ch2,ch2));
280
208f139e 281 // list of segments
96ebe67e 282 TClonesArray *segments = new TClonesArray("AliMUONObjectPair", 100);
7ec3b9cf 283
96ebe67e 284 // Loop over clusters in the first chamber of the station
285 while ( ( cluster1 = static_cast<AliMUONVCluster*>(nextInCh1()) ) ) {
6b191dea 286 z1 = cluster1->GetZ();
96ebe67e 287
288 // reset cluster iterator of chamber 2
289 nextInCh2.Reset();
290
291 // Loop over clusters in the second chamber of the station
292 while ( ( cluster2 = static_cast<AliMUONVCluster*>(nextInCh2()) ) ) {
6b191dea 293 z2 = cluster2->GetZ();
294 dZ = z1 - z2;
96ebe67e 295
6b191dea 296 // ------ track selection in non bending direction ------
297 nonBendingSlope = (cluster1->GetX() - cluster2->GetX()) / dZ;
298 if (GetRecoParam()->SelectOnTrackSlope()) {
9f093251 299
6b191dea 300 // check if non bending slope is within tolerances
301 nonBendingSlopeErr = TMath::Sqrt((cluster1->GetErrX2() + cluster2->GetErrX2()) / dZ / dZ + (ch1 + 1.) * fMaxMCSAngle2);
302 if ((TMath::Abs(nonBendingSlope) - sigmaCut * nonBendingSlopeErr) > GetRecoParam()->GetMaxNonBendingSlope()) continue;
9f093251 303
6b191dea 304 } else {
305
306 // or check if non bending impact parameter is within tolerances
307 nonBendingImpactParam = TMath::Abs(cluster1->GetX() - cluster1->GetZ() * nonBendingSlope);
308 nonBendingImpactParamErr = TMath::Sqrt((z1 * z1 * cluster2->GetErrX2() + z2 * z2 * cluster1->GetErrX2()) / dZ / dZ + impactMCS2);
309 if ((nonBendingImpactParam - sigmaCut * nonBendingImpactParamErr) > (3. * GetRecoParam()->GetNonBendingVertexDispersion())) continue;
310
311 }
312
313 // ------ track selection in bending direction ------
314 bendingSlope = (cluster1->GetY() - cluster2->GetY()) / dZ;
315 if (AliMUONTrackExtrap::IsFieldON()) { // depending whether the field is ON or OFF
9f093251 316
317 // check if bending momentum is within tolerances
6b191dea 318 bendingImpactParam = cluster1->GetY() - cluster1->GetZ() * bendingSlope;
319 bendingImpactParamErr2 = (z1 * z1 * cluster2->GetErrY2() + z2 * z2 * cluster1->GetErrY2()) / dZ / dZ + impactMCS2;
320 bendingMomentum = TMath::Abs(AliMUONTrackExtrap::GetBendingMomentumFromImpactParam(bendingImpactParam));
321 bendingMomentumErr = TMath::Sqrt((bendingVertexDispersion2 + bendingImpactParamErr2) /
322 bendingImpactParam / bendingImpactParam + 0.01) * bendingMomentum;
323 if ((bendingMomentum + 3. * bendingMomentumErr) < GetRecoParam()->GetMinBendingMomentum()) continue;
96ebe67e 324
9f093251 325 } else {
326
6b191dea 327 if (GetRecoParam()->SelectOnTrackSlope()) {
328
329 // check if bending slope is within tolerances
330 bendingSlopeErr = TMath::Sqrt((cluster1->GetErrY2() + cluster2->GetErrY2()) / dZ / dZ + (ch1 + 1.) * fMaxMCSAngle2);
331 if ((TMath::Abs(bendingSlope) - sigmaCut * bendingSlopeErr) > GetRecoParam()->GetMaxBendingSlope()) continue;
332
333 } else {
334
335 // or check if bending impact parameter is within tolerances
336 bendingImpactParam = TMath::Abs(cluster1->GetY() - cluster1->GetZ() * bendingSlope);
337 bendingImpactParamErr = TMath::Sqrt((z1 * z1 * cluster2->GetErrY2() + z2 * z2 * cluster1->GetErrY2()) / dZ / dZ + impactMCS2);
338 if ((bendingImpactParam - sigmaCut * bendingImpactParamErr) > (3. * GetRecoParam()->GetBendingVertexDispersion())) continue;
339
340 }
341
9f093251 342 }
6b191dea 343
9f093251 344 // make new segment
345 segment = new ((*segments)[segments->GetLast()+1]) AliMUONObjectPair(cluster1, cluster2, kFALSE, kFALSE);
346
347 // Printout for debug
348 if (AliLog::GetGlobalDebugLevel() > 1) {
349 cout << "segmentIndex(0...): " << segments->GetLast() << endl;
350 segment->Dump();
351 cout << "Cluster in first chamber" << endl;
352 cluster1->Print();
353 cout << "Cluster in second chamber" << endl;
354 cluster2->Print();
8d0843c6 355 }
96ebe67e 356
357 }
358
359 }
360
361 // Printout for debug
9bf6860b 362 AliDebug(1,Form("chambers%d-%d: NSegments = %d ", ch1+1, ch2+1, segments->GetEntriesFast()));
96ebe67e 363
208f139e 364 return segments;
8d0843c6 365}
366
ea94c18b 367 //__________________________________________________________________________
89c8d66d 368void AliMUONVTrackReconstructor::RemoveUsedSegments(TClonesArray& segments)
369{
370 /// To remove pairs of clusters already attached to a track
371 AliDebug(1,"Enter RemoveUsedSegments");
372 Int_t nSegments = segments.GetEntriesFast();
373 Int_t nTracks = fRecTracksPtr->GetEntriesFast();
374 AliMUONObjectPair *segment;
375 AliMUONTrack *track;
376 AliMUONVCluster *cluster, *cluster1, *cluster2;
377 Bool_t foundCluster1, foundCluster2, removeSegment;
378
379 // Loop over segments
380 for (Int_t iSegment=0; iSegment<nSegments; iSegment++) {
381 segment = (AliMUONObjectPair*) segments.UncheckedAt(iSegment);
382
383 cluster1 = (AliMUONVCluster*) segment->First();
384 cluster2 = (AliMUONVCluster*) segment->Second();
385 removeSegment = kFALSE;
386
387 // Loop over tracks
388 for (Int_t iTrack = 0; iTrack < nTracks; iTrack++) {
389 track = (AliMUONTrack*) fRecTracksPtr->UncheckedAt(iTrack);
390
391 // skip empty slot
392 if (!track) continue;
393
394 foundCluster1 = kFALSE;
395 foundCluster2 = kFALSE;
396
397 // Loop over clusters
398 Int_t nClusters = track->GetNClusters();
399 for (Int_t iCluster = 0; iCluster < nClusters; iCluster++) {
400 cluster = ((AliMUONTrackParam*) track->GetTrackParamAtCluster()->UncheckedAt(iCluster))->GetClusterPtr();
401
402 // check if both clusters are in that track
403 if (cluster == cluster1) foundCluster1 = kTRUE;
404 else if (cluster == cluster2) foundCluster2 = kTRUE;
405
406 if (foundCluster1 && foundCluster2) {
407 removeSegment = kTRUE;
408 break;
409 }
410
411 }
412
413 if (removeSegment) break;
414
415 }
416
417 if (removeSegment) segments.RemoveAt(iSegment);
418
419 }
420
421 segments.Compress();
422
423 // Printout for debug
424 AliDebug(1,Form("NSegments = %d ", segments.GetEntriesFast()));
425}
426
427 //__________________________________________________________________________
ea94c18b 428void AliMUONVTrackReconstructor::RemoveIdenticalTracks()
429{
430 /// To remove identical tracks:
96ebe67e 431 /// Tracks are considered identical if they have all their clusters in common.
432 /// One keeps the track with the larger number of clusters if need be
89c8d66d 433 AliMUONTrack *track1, *track2;
434 Int_t nTracks = fRecTracksPtr->GetEntriesFast();
96ebe67e 435 Int_t clustersInCommon, nClusters1, nClusters2;
ea94c18b 436 // Loop over first track of the pair
89c8d66d 437 for (Int_t iTrack1 = 0; iTrack1 < nTracks; iTrack1++) {
438 track1 = (AliMUONTrack*) fRecTracksPtr->UncheckedAt(iTrack1);
439 // skip empty slot
440 if (!track1) continue;
96ebe67e 441 nClusters1 = track1->GetNClusters();
ea94c18b 442 // Loop over second track of the pair
89c8d66d 443 for (Int_t iTrack2 = iTrack1+1; iTrack2 < nTracks; iTrack2++) {
444 track2 = (AliMUONTrack*) fRecTracksPtr->UncheckedAt(iTrack2);
445 // skip empty slot
446 if (!track2) continue;
96ebe67e 447 nClusters2 = track2->GetNClusters();
448 // number of clusters in common between two tracks
449 clustersInCommon = track1->ClustersInCommon(track2);
ea94c18b 450 // check for identical tracks
96ebe67e 451 if ((clustersInCommon == nClusters1) || (clustersInCommon == nClusters2)) {
ea94c18b 452 // decide which track to remove
96ebe67e 453 if (nClusters2 > nClusters1) {
ea94c18b 454 // remove track1 and continue the first loop with the track next to track1
89c8d66d 455 fRecTracksPtr->RemoveAt(iTrack1);
ea94c18b 456 fNRecTracks--;
ea94c18b 457 break;
458 } else {
459 // remove track2 and continue the second loop with the track next to track2
89c8d66d 460 fRecTracksPtr->RemoveAt(iTrack2);
ea94c18b 461 fNRecTracks--;
462 }
89c8d66d 463 }
ea94c18b 464 } // track2
ea94c18b 465 } // track1
89c8d66d 466 fRecTracksPtr->Compress(); // this is essential to retrieve the TClonesArray afterwards
ea94c18b 467}
468
469 //__________________________________________________________________________
470void AliMUONVTrackReconstructor::RemoveDoubleTracks()
471{
472 /// To remove double tracks:
96ebe67e 473 /// Tracks are considered identical if more than half of the clusters of the track
474 /// which has the smaller number of clusters are in common with the other track.
475 /// Among two identical tracks, one keeps the track with the larger number of clusters
ea94c18b 476 /// or, if these numbers are equal, the track with the minimum chi2.
89c8d66d 477 AliMUONTrack *track1, *track2;
478 Int_t nTracks = fRecTracksPtr->GetEntriesFast();
479 Int_t clustersInCommon2, nClusters1, nClusters2;
ea94c18b 480 // Loop over first track of the pair
89c8d66d 481 for (Int_t iTrack1 = 0; iTrack1 < nTracks; iTrack1++) {
482 track1 = (AliMUONTrack*) fRecTracksPtr->UncheckedAt(iTrack1);
483 // skip empty slot
484 if (!track1) continue;
96ebe67e 485 nClusters1 = track1->GetNClusters();
ea94c18b 486 // Loop over second track of the pair
89c8d66d 487 for (Int_t iTrack2 = iTrack1+1; iTrack2 < nTracks; iTrack2++) {
488 track2 = (AliMUONTrack*) fRecTracksPtr->UncheckedAt(iTrack2);
489 // skip empty slot
490 if (!track2) continue;
96ebe67e 491 nClusters2 = track2->GetNClusters();
492 // number of clusters in common between two tracks
89c8d66d 493 clustersInCommon2 = 2 * track1->ClustersInCommon(track2);
ea94c18b 494 // check for identical tracks
89c8d66d 495 if (clustersInCommon2 > nClusters1 || clustersInCommon2 > nClusters2) {
ea94c18b 496 // decide which track to remove
96ebe67e 497 if ((nClusters1 > nClusters2) || ((nClusters1 == nClusters2) && (track1->GetGlobalChi2() <= track2->GetGlobalChi2()))) {
ea94c18b 498 // remove track2 and continue the second loop with the track next to track2
89c8d66d 499 fRecTracksPtr->RemoveAt(iTrack2);
c59f70b9 500 fNRecTracks--;
501 } else {
502 // else remove track1 and continue the first loop with the track next to track1
89c8d66d 503 fRecTracksPtr->RemoveAt(iTrack1);
c59f70b9 504 fNRecTracks--;
c59f70b9 505 break;
506 }
89c8d66d 507 }
c59f70b9 508 } // track2
c59f70b9 509 } // track1
89c8d66d 510 fRecTracksPtr->Compress(); // this is essential to retrieve the TClonesArray afterwards
c59f70b9 511}
512
513 //__________________________________________________________________________
514void AliMUONVTrackReconstructor::RemoveConnectedTracks(Bool_t inSt345)
515{
516 /// To remove double tracks:
517 /// Tracks are considered identical if they share 1 cluster or more.
518 /// If inSt345=kTRUE only stations 3, 4 and 5 are considered.
519 /// Among two identical tracks, one keeps the track with the larger number of clusters
520 /// or, if these numbers are equal, the track with the minimum chi2.
521 AliMUONTrack *track1, *track2, *trackToRemove;
522 Int_t clustersInCommon, nClusters1, nClusters2;
523 Bool_t removedTrack1;
524 // Loop over first track of the pair
525 track1 = (AliMUONTrack*) fRecTracksPtr->First();
526 while (track1) {
527 removedTrack1 = kFALSE;
528 nClusters1 = track1->GetNClusters();
529 // Loop over second track of the pair
530 track2 = (AliMUONTrack*) fRecTracksPtr->After(track1);
531 while (track2) {
532 nClusters2 = track2->GetNClusters();
533 // number of clusters in common between two tracks
89c8d66d 534 if (inSt345) clustersInCommon = track1->ClustersInCommonInSt345(track2);
535 else clustersInCommon = track1->ClustersInCommon(track2);
c59f70b9 536 // check for identical tracks
537 if (clustersInCommon > 0) {
538 // decide which track to remove
539 if ((nClusters1 > nClusters2) || ((nClusters1 == nClusters2) && (track1->GetGlobalChi2() <= track2->GetGlobalChi2()))) {
540 // remove track2 and continue the second loop with the track next to track2
541 trackToRemove = track2;
542 track2 = (AliMUONTrack*) fRecTracksPtr->After(track2);
543 fRecTracksPtr->Remove(trackToRemove);
ea94c18b 544 fRecTracksPtr->Compress(); // this is essential to retrieve the TClonesArray afterwards
545 fNRecTracks--;
546 } else {
547 // else remove track1 and continue the first loop with the track next to track1
548 trackToRemove = track1;
549 track1 = (AliMUONTrack*) fRecTracksPtr->After(track1);
550 fRecTracksPtr->Remove(trackToRemove);
551 fRecTracksPtr->Compress(); // this is essential to retrieve the TClonesArray afterwards
552 fNRecTracks--;
553 removedTrack1 = kTRUE;
554 break;
555 }
556 } else track2 = (AliMUONTrack*) fRecTracksPtr->After(track2);
557 } // track2
558 if (removedTrack1) continue;
559 track1 = (AliMUONTrack*) fRecTracksPtr->After(track1);
560 } // track1
561 return;
562}
563
564 //__________________________________________________________________________
9bf6860b 565void AliMUONVTrackReconstructor::AskForNewClustersInChamber(const AliMUONTrackParam &trackParam,
566 AliMUONVClusterStore& clusterStore, Int_t chamber)
1fef78c8 567{
568 /// Ask the clustering to reconstruct new clusters around the track candidate position
1fef78c8 569
9bf6860b 570 // check if the current chamber is useable
a0dc65b4 571 if (!fClusterServer || !GetRecoParam()->UseChamber(chamber)) return;
1fef78c8 572
9bf6860b 573 // maximum distance between the center of the chamber and a detection element
574 // (accounting for the inclination of the chamber)
b89ac3d6 575 static const Double_t kMaxDZ = 15.; // 15 cm
1fef78c8 576
9bf6860b 577 // extrapolate track parameters to the chamber
578 AliMUONTrackParam extrapTrackParam(trackParam);
4ea3f013 579 if (!AliMUONTrackExtrap::ExtrapToZCov(&extrapTrackParam, AliMUONConstants::DefaultChamberZ(chamber))) return;
9bf6860b 580
6b191dea 581 // build the searching area using the track and chamber resolutions and the maximum-distance-to-track value
9bf6860b 582 const TMatrixD& kParamCov = extrapTrackParam.GetCovariances();
6b191dea 583 Double_t errX2 = kParamCov(0,0) + kMaxDZ * kMaxDZ * kParamCov(1,1) + 2. * kMaxDZ * TMath::Abs(kParamCov(0,1)) +
584 GetRecoParam()->GetDefaultNonBendingReso(chamber) * GetRecoParam()->GetDefaultNonBendingReso(chamber);
585 Double_t errY2 = kParamCov(2,2) + kMaxDZ * kMaxDZ * kParamCov(3,3) + 2. * kMaxDZ * TMath::Abs(kParamCov(2,3)) +
586 GetRecoParam()->GetDefaultBendingReso(chamber) * GetRecoParam()->GetDefaultBendingReso(chamber);
b89ac3d6 587 Double_t dX = TMath::Abs(trackParam.GetNonBendingSlope()) * kMaxDZ +
a0dc65b4 588 GetRecoParam()->GetMaxNonBendingDistanceToTrack() +
6b191dea 589 GetRecoParam()->GetSigmaCutForTracking() * TMath::Sqrt(2. * errX2);
b89ac3d6 590 Double_t dY = TMath::Abs(trackParam.GetBendingSlope()) * kMaxDZ +
a0dc65b4 591 GetRecoParam()->GetMaxBendingDistanceToTrack() +
6b191dea 592 GetRecoParam()->GetSigmaCutForTracking() * TMath::Sqrt(2. * errY2);
6e97fbb8 593 AliMpArea area(extrapTrackParam.GetNonBendingCoor(),
594 extrapTrackParam.GetBendingCoor(),
595 dX, dY);
1fef78c8 596
597 // ask to cluterize in the given area of the given chamber
35be7ed7 598 fClusterServer->Clusterize(chamber, clusterStore, area, GetRecoParam());
1fef78c8 599
9bf6860b 600}
601
602 //__________________________________________________________________________
603void AliMUONVTrackReconstructor::AskForNewClustersInStation(const AliMUONTrackParam &trackParam,
604 AliMUONVClusterStore& clusterStore, Int_t station)
605{
606 /// Ask the clustering to reconstruct new clusters around the track candidate position
607 /// in the 2 chambers of the given station
608 AskForNewClustersInChamber(trackParam, clusterStore, 2*station+1);
609 AskForNewClustersInChamber(trackParam, clusterStore, 2*station);
1fef78c8 610}
611
612 //__________________________________________________________________________
96ebe67e 613Double_t AliMUONVTrackReconstructor::TryOneCluster(const AliMUONTrackParam &trackParam, AliMUONVCluster* cluster,
1fef78c8 614 AliMUONTrackParam &trackParamAtCluster, Bool_t updatePropagator)
ea94c18b 615{
96ebe67e 616/// Test the compatibility between the track and the cluster (using trackParam's covariance matrix):
ea94c18b 617/// return the corresponding Chi2
96ebe67e 618/// return trackParamAtCluster
ea94c18b 619
96ebe67e 620 // extrapolate track parameters and covariances at the z position of the tested cluster
4ea3f013 621 // and set pointer to cluster into trackParamAtCluster
96ebe67e 622 trackParamAtCluster = trackParam;
96ebe67e 623 trackParamAtCluster.SetClusterPtr(cluster);
4ea3f013 624 if (!AliMUONTrackExtrap::ExtrapToZCov(&trackParamAtCluster, cluster->GetZ(), updatePropagator))
625 return 2.*AliMUONTrack::MaxChi2();
ea94c18b 626
96ebe67e 627 // Set differences between trackParam and cluster in the bending and non bending directions
628 Double_t dX = cluster->GetX() - trackParamAtCluster.GetNonBendingCoor();
629 Double_t dY = cluster->GetY() - trackParamAtCluster.GetBendingCoor();
ea94c18b 630
019df241 631 // Calculate errors and covariances
96ebe67e 632 const TMatrixD& kParamCov = trackParamAtCluster.GetCovariances();
633 Double_t sigmaX2 = kParamCov(0,0) + cluster->GetErrX2();
634 Double_t sigmaY2 = kParamCov(2,2) + cluster->GetErrY2();
6b191dea 635 Double_t covXY = kParamCov(0,2);
636 Double_t det = sigmaX2 * sigmaY2 - covXY * covXY;
019df241 637
638 // Compute chi2
4ea3f013 639 if (det == 0.) return 2.*AliMUONTrack::MaxChi2();
6b191dea 640 return (dX * dX * sigmaY2 + dY * dY * sigmaX2 - 2. * dX * dY * covXY) / det;
019df241 641
642}
643
644 //__________________________________________________________________________
5a240757 645Bool_t AliMUONVTrackReconstructor::TryOneClusterFast(const AliMUONTrackParam &trackParam, const AliMUONVCluster* cluster)
019df241 646{
9bf6860b 647/// Test the compatibility between the track and the cluster
6b191dea 648/// given the track and cluster resolutions + the maximum-distance-to-track value
9bf6860b 649/// and assuming linear propagation of the track:
019df241 650/// return kTRUE if they are compatibles
651
96ebe67e 652 Double_t dZ = cluster->GetZ() - trackParam.GetZ();
653 Double_t dX = cluster->GetX() - (trackParam.GetNonBendingCoor() + trackParam.GetNonBendingSlope() * dZ);
654 Double_t dY = cluster->GetY() - (trackParam.GetBendingCoor() + trackParam.GetBendingSlope() * dZ);
9bf6860b 655 const TMatrixD& kParamCov = trackParam.GetCovariances();
6b191dea 656 Double_t errX2 = kParamCov(0,0) + dZ * dZ * kParamCov(1,1) + 2. * dZ * kParamCov(0,1) + cluster->GetErrX2();
657 Double_t errY2 = kParamCov(2,2) + dZ * dZ * kParamCov(3,3) + 2. * dZ * kParamCov(2,3) + cluster->GetErrY2();
9bf6860b 658
6b191dea 659 Double_t dXmax = GetRecoParam()->GetSigmaCutForTracking() * TMath::Sqrt(2. * errX2) +
a0dc65b4 660 GetRecoParam()->GetMaxNonBendingDistanceToTrack();
6b191dea 661 Double_t dYmax = GetRecoParam()->GetSigmaCutForTracking() * TMath::Sqrt(2. * errY2) +
a0dc65b4 662 GetRecoParam()->GetMaxBendingDistanceToTrack();
019df241 663
9bf6860b 664 if (TMath::Abs(dX) > dXmax || TMath::Abs(dY) > dYmax) return kFALSE;
019df241 665
666 return kTRUE;
667
668}
669
670 //__________________________________________________________________________
96ebe67e 671Double_t AliMUONVTrackReconstructor::TryTwoClustersFast(const AliMUONTrackParam &trackParamAtCluster1, AliMUONVCluster* cluster2,
672 AliMUONTrackParam &trackParamAtCluster2)
019df241 673{
96ebe67e 674/// Test the compatibility between the track and the 2 clusters together (using trackParam's covariance matrix)
675/// assuming linear propagation between the two clusters:
676/// return the corresponding Chi2 accounting for covariances between the 2 clusters
677/// return trackParamAtCluster2
019df241 678
96ebe67e 679 // extrapolate linearly track parameters and covariances at the z position of the second cluster
680 trackParamAtCluster2 = trackParamAtCluster1;
3fe6651e 681 AliMUONTrackExtrap::LinearExtrapToZCov(&trackParamAtCluster2, cluster2->GetZ());
019df241 682
96ebe67e 683 // set pointer to cluster2 into trackParamAtCluster2
684 trackParamAtCluster2.SetClusterPtr(cluster2);
019df241 685
96ebe67e 686 // Set differences between track and clusters in the bending and non bending directions
687 AliMUONVCluster* cluster1 = trackParamAtCluster1.GetClusterPtr();
688 Double_t dX1 = cluster1->GetX() - trackParamAtCluster1.GetNonBendingCoor();
689 Double_t dX2 = cluster2->GetX() - trackParamAtCluster2.GetNonBendingCoor();
690 Double_t dY1 = cluster1->GetY() - trackParamAtCluster1.GetBendingCoor();
691 Double_t dY2 = cluster2->GetY() - trackParamAtCluster2.GetBendingCoor();
019df241 692
693 // Calculate errors and covariances
96ebe67e 694 const TMatrixD& kParamCov1 = trackParamAtCluster1.GetCovariances();
695 const TMatrixD& kParamCov2 = trackParamAtCluster2.GetCovariances();
696 Double_t dZ = trackParamAtCluster2.GetZ() - trackParamAtCluster1.GetZ();
697 Double_t sigma2X1 = kParamCov1(0,0) + cluster1->GetErrX2();
698 Double_t sigma2X2 = kParamCov2(0,0) + cluster2->GetErrX2();
019df241 699 Double_t covX1X2 = kParamCov1(0,0) + dZ * kParamCov1(0,1);
96ebe67e 700 Double_t sigma2Y1 = kParamCov1(2,2) + cluster1->GetErrY2();
701 Double_t sigma2Y2 = kParamCov2(2,2) + cluster2->GetErrY2();
019df241 702 Double_t covY1Y2 = kParamCov1(2,2) + dZ * kParamCov1(2,3);
703
704 // Compute chi2
705 Double_t detX = sigma2X1 * sigma2X2 - covX1X2 * covX1X2;
706 Double_t detY = sigma2Y1 * sigma2Y2 - covY1Y2 * covY1Y2;
4ea3f013 707 if (detX == 0. || detY == 0.) return 2.*AliMUONTrack::MaxChi2();
019df241 708 return (dX1 * dX1 * sigma2X2 + dX2 * dX2 * sigma2X1 - 2. * dX1 * dX2 * covX1X2) / detX
709 + (dY1 * dY1 * sigma2Y2 + dY2 * dY2 * sigma2Y1 - 2. * dY1 * dY2 * covY1Y2) / detY;
710
711}
712
713 //__________________________________________________________________________
9bf6860b 714Bool_t AliMUONVTrackReconstructor::FollowLinearTrackInChamber(AliMUONTrack &trackCandidate, const AliMUONVClusterStore& clusterStore,
715 Int_t nextChamber)
716{
717 /// Follow trackCandidate in chamber(0..) nextChamber assuming linear propagation, and search for compatible cluster(s)
718 /// Keep all possibilities or only the best one(s) according to the flag fgkTrackAllTracks:
719 /// kTRUE: duplicate "trackCandidate" if there are several possibilities and add the new tracks at the end of
720 /// fRecTracksPtr to avoid conficts with other track candidates at this current stage of the tracking procedure.
721 /// Remove the obsolete "trackCandidate" at the end.
722 /// kFALSE: add only the best cluster(s) to the "trackCandidate". Try to add a couple of clusters in priority.
723 /// return kTRUE if new cluster(s) have been found (otherwise return kFALSE)
724 AliDebug(1,Form("Enter FollowLinearTrackInChamber(1..) %d", nextChamber+1));
725
4ea3f013 726 Double_t chi2WithOneCluster = AliMUONTrack::MaxChi2();
a0dc65b4 727 Double_t maxChi2WithOneCluster = 2. * GetRecoParam()->GetSigmaCutForTracking() *
728 GetRecoParam()->GetSigmaCutForTracking(); // 2 because 2 quantities in chi2
9bf6860b 729 Double_t bestChi2WithOneCluster = maxChi2WithOneCluster;
730 Bool_t foundOneCluster = kFALSE;
731 AliMUONTrack *newTrack = 0x0;
732 AliMUONVCluster *cluster;
733 AliMUONTrackParam trackParam;
734 AliMUONTrackParam extrapTrackParamAtCluster;
735 AliMUONTrackParam bestTrackParamAtCluster;
736
737 // Get track parameters according to the propagation direction
738 if (nextChamber > 7) trackParam = *(AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->Last();
739 else trackParam = *(AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->First();
740
741 // Printout for debuging
742 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 2) || (AliLog::GetGlobalDebugLevel() >= 2)) {
743 cout<<endl<<"Track parameters and covariances at first cluster:"<<endl;
744 trackParam.GetParameters().Print();
745 trackParam.GetCovariances().Print();
746 }
747
748 // Add MCS effect
749 AliMUONTrackExtrap::AddMCSEffect(&trackParam,AliMUONConstants::ChamberThicknessInX0(),1.);
750
751 // Printout for debuging
752 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
753 cout << "FollowLinearTrackInChamber: look for cluster in chamber(1..): " << nextChamber+1 << endl;
754 }
755
756 // Create iterators to loop over clusters in chamber
757 TIter next(clusterStore.CreateChamberIterator(nextChamber,nextChamber));
758
759 // look for candidates in chamber
760 while ( ( cluster = static_cast<AliMUONVCluster*>(next()) ) ) {
761
762 // try to add the current cluster fast
763 if (!TryOneClusterFast(trackParam, cluster)) continue;
764
765 // try to add the current cluster accuratly
766 extrapTrackParamAtCluster = trackParam;
3fe6651e 767 AliMUONTrackExtrap::LinearExtrapToZCov(&extrapTrackParamAtCluster, cluster->GetZ());
9bf6860b 768 chi2WithOneCluster = TryOneCluster(extrapTrackParamAtCluster, cluster, extrapTrackParamAtCluster);
769
770 // if good chi2 then consider to add cluster
771 if (chi2WithOneCluster < maxChi2WithOneCluster) {
772 foundOneCluster = kTRUE;
773
774 // Printout for debuging
775 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
776 cout << "FollowLinearTrackInChamber: found one cluster in chamber(1..): " << nextChamber+1
777 << " (Chi2 = " << chi2WithOneCluster << ")" << endl;
778 cluster->Print();
779 }
780
a0dc65b4 781 if (GetRecoParam()->TrackAllTracks()) {
9bf6860b 782 // copy trackCandidate into a new track put at the end of fRecTracksPtr and add the new cluster
783 newTrack = new ((*fRecTracksPtr)[fRecTracksPtr->GetLast()+1]) AliMUONTrack(trackCandidate);
a0dc65b4 784 if (GetRecoParam()->RequestStation(nextChamber/2))
9bf6860b 785 extrapTrackParamAtCluster.SetRemovable(kFALSE);
786 else extrapTrackParamAtCluster.SetRemovable(kTRUE);
787 newTrack->AddTrackParamAtCluster(extrapTrackParamAtCluster,*cluster);
89c8d66d 788 newTrack->SetGlobalChi2(trackCandidate.GetGlobalChi2()+chi2WithOneCluster);
9bf6860b 789 fNRecTracks++;
790
791 // Printout for debuging
792 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
793 cout << "FollowLinearTrackInChamber: added one cluster in chamber(1..): " << nextChamber+1 << endl;
794 if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump();
795 }
796
797 } else if (chi2WithOneCluster < bestChi2WithOneCluster) {
798 // keep track of the best cluster
799 bestChi2WithOneCluster = chi2WithOneCluster;
800 bestTrackParamAtCluster = extrapTrackParamAtCluster;
801 }
802
803 }
804
805 }
806
807 // fill out the best track if required else clean up the fRecTracksPtr array
a0dc65b4 808 if (!GetRecoParam()->TrackAllTracks()) {
9bf6860b 809 if (foundOneCluster) {
a0dc65b4 810 if (GetRecoParam()->RequestStation(nextChamber/2))
9bf6860b 811 bestTrackParamAtCluster.SetRemovable(kFALSE);
812 else bestTrackParamAtCluster.SetRemovable(kTRUE);
813 trackCandidate.AddTrackParamAtCluster(bestTrackParamAtCluster,*(bestTrackParamAtCluster.GetClusterPtr()));
89c8d66d 814 trackCandidate.SetGlobalChi2(trackCandidate.GetGlobalChi2()+bestChi2WithOneCluster);
9bf6860b 815
816 // Printout for debuging
817 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
818 cout << "FollowLinearTrackInChamber: added the best cluster in chamber(1..): " << bestTrackParamAtCluster.GetClusterPtr()->GetChamberId()+1 << endl;
819 if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump();
820 }
821
822 } else return kFALSE;
823
824 } else if (foundOneCluster) {
825
826 // remove obsolete track
827 fRecTracksPtr->Remove(&trackCandidate);
828 fNRecTracks--;
829
830 } else return kFALSE;
831
832 return kTRUE;
833
834}
835
836//__________________________________________________________________________
96ebe67e 837Bool_t AliMUONVTrackReconstructor::FollowLinearTrackInStation(AliMUONTrack &trackCandidate, const AliMUONVClusterStore& clusterStore,
838 Int_t nextStation)
019df241 839{
96ebe67e 840 /// Follow trackCandidate in station(0..) nextStation assuming linear propagation, and search for compatible cluster(s)
019df241 841 /// Keep all possibilities or only the best one(s) according to the flag fgkTrackAllTracks:
842 /// kTRUE: duplicate "trackCandidate" if there are several possibilities and add the new tracks at the end of
843 /// fRecTracksPtr to avoid conficts with other track candidates at this current stage of the tracking procedure.
844 /// Remove the obsolete "trackCandidate" at the end.
96ebe67e 845 /// kFALSE: add only the best cluster(s) to the "trackCandidate". Try to add a couple of clusters in priority.
846 /// return kTRUE if new cluster(s) have been found (otherwise return kFALSE)
019df241 847 AliDebug(1,Form("Enter FollowLinearTrackInStation(1..) %d", nextStation+1));
848
849 // Order the chamber according to the propagation direction (tracking starts with chamber 2):
850 // - nextStation == station(1...) 5 => forward propagation
851 // - nextStation < station(1...) 5 => backward propagation
852 Int_t ch1, ch2;
853 if (nextStation==4) {
854 ch1 = 2*nextStation+1;
855 ch2 = 2*nextStation;
ea94c18b 856 } else {
019df241 857 ch1 = 2*nextStation;
858 ch2 = 2*nextStation+1;
ea94c18b 859 }
860
4ea3f013 861 Double_t chi2WithOneCluster = AliMUONTrack::MaxChi2();
862 Double_t chi2WithTwoClusters = AliMUONTrack::MaxChi2();
a0dc65b4 863 Double_t maxChi2WithOneCluster = 2. * GetRecoParam()->GetSigmaCutForTracking() *
864 GetRecoParam()->GetSigmaCutForTracking(); // 2 because 2 quantities in chi2
865 Double_t maxChi2WithTwoClusters = 4. * GetRecoParam()->GetSigmaCutForTracking() *
866 GetRecoParam()->GetSigmaCutForTracking(); // 4 because 4 quantities in chi2
96ebe67e 867 Double_t bestChi2WithOneCluster = maxChi2WithOneCluster;
868 Double_t bestChi2WithTwoClusters = maxChi2WithTwoClusters;
869 Bool_t foundOneCluster = kFALSE;
870 Bool_t foundTwoClusters = kFALSE;
019df241 871 AliMUONTrack *newTrack = 0x0;
96ebe67e 872 AliMUONVCluster *clusterCh1, *clusterCh2;
7332f213 873 AliMUONTrackParam trackParam;
96ebe67e 874 AliMUONTrackParam extrapTrackParamAtCluster1;
875 AliMUONTrackParam extrapTrackParamAtCluster2;
876 AliMUONTrackParam bestTrackParamAtCluster1;
877 AliMUONTrackParam bestTrackParamAtCluster2;
878
879 Int_t nClusters = clusterStore.GetSize();
880 Bool_t *clusterCh1Used = new Bool_t[nClusters];
881 for (Int_t i = 0; i < nClusters; i++) clusterCh1Used[i] = kFALSE;
882 Int_t iCluster1;
019df241 883
7332f213 884 // Get track parameters according to the propagation direction
885 if (nextStation==4) trackParam = *(AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->Last();
886 else trackParam = *(AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->First();
019df241 887
9bf6860b 888 // Printout for debuging
889 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 2) || (AliLog::GetGlobalDebugLevel() >= 2)) {
890 cout<<endl<<"Track parameters and covariances at first cluster:"<<endl;
891 trackParam.GetParameters().Print();
892 trackParam.GetCovariances().Print();
893 }
894
019df241 895 // Add MCS effect
896 AliMUONTrackExtrap::AddMCSEffect(&trackParam,AliMUONConstants::ChamberThicknessInX0(),1.);
897
898 // Printout for debuging
899 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
96ebe67e 900 cout << "FollowLinearTrackInStation: look for clusters in chamber(1..): " << ch2+1 << endl;
019df241 901 }
902
96ebe67e 903 // Create iterators to loop over clusters in both chambers
904 TIter nextInCh1(clusterStore.CreateChamberIterator(ch1,ch1));
905 TIter nextInCh2(clusterStore.CreateChamberIterator(ch2,ch2));
906
907 // look for candidates in chamber 2
908 while ( ( clusterCh2 = static_cast<AliMUONVCluster*>(nextInCh2()) ) ) {
019df241 909
96ebe67e 910 // try to add the current cluster fast
911 if (!TryOneClusterFast(trackParam, clusterCh2)) continue;
019df241 912
96ebe67e 913 // try to add the current cluster accuratly
914 extrapTrackParamAtCluster2 = trackParam;
3fe6651e 915 AliMUONTrackExtrap::LinearExtrapToZCov(&extrapTrackParamAtCluster2, clusterCh2->GetZ());
96ebe67e 916 chi2WithOneCluster = TryOneCluster(extrapTrackParamAtCluster2, clusterCh2, extrapTrackParamAtCluster2);
019df241 917
96ebe67e 918 // if good chi2 then try to attach a cluster in the other chamber too
919 if (chi2WithOneCluster < maxChi2WithOneCluster) {
920 Bool_t foundSecondCluster = kFALSE;
019df241 921
922 // Printout for debuging
923 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
96ebe67e 924 cout << "FollowLinearTrackInStation: found one cluster in chamber(1..): " << ch2+1
925 << " (Chi2 = " << chi2WithOneCluster << ")" << endl;
9bf6860b 926 clusterCh2->Print();
96ebe67e 927 cout << " look for second clusters in chamber(1..): " << ch1+1 << " ..." << endl;
019df241 928 }
929
930 // add MCS effect
96ebe67e 931 AliMUONTrackExtrap::AddMCSEffect(&extrapTrackParamAtCluster2,AliMUONConstants::ChamberThicknessInX0(),1.);
019df241 932
96ebe67e 933 // reset cluster iterator of chamber 1
934 nextInCh1.Reset();
935 iCluster1 = -1;
936
937 // look for second candidates in chamber 1
938 while ( ( clusterCh1 = static_cast<AliMUONVCluster*>(nextInCh1()) ) ) {
939 iCluster1++;
019df241 940
96ebe67e 941 // try to add the current cluster fast
942 if (!TryOneClusterFast(extrapTrackParamAtCluster2, clusterCh1)) continue;
019df241 943
96ebe67e 944 // try to add the current cluster in addition to the one found in the previous chamber
945 chi2WithTwoClusters = TryTwoClustersFast(extrapTrackParamAtCluster2, clusterCh1, extrapTrackParamAtCluster1);
019df241 946
96ebe67e 947 // if good chi2 then consider to add the 2 clusters to the "trackCandidate"
948 if (chi2WithTwoClusters < maxChi2WithTwoClusters) {
949 foundSecondCluster = kTRUE;
950 foundTwoClusters = kTRUE;
019df241 951
952 // Printout for debuging
953 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
96ebe67e 954 cout << "FollowLinearTrackInStation: found one cluster in chamber(1..): " << ch1+1
9bf6860b 955 << " (Chi2 = " << chi2WithTwoClusters << ")" << endl;
956 clusterCh1->Print();
019df241 957 }
958
a0dc65b4 959 if (GetRecoParam()->TrackAllTracks()) {
96ebe67e 960 // copy trackCandidate into a new track put at the end of fRecTracksPtr and add the new clusters
019df241 961 newTrack = new ((*fRecTracksPtr)[fRecTracksPtr->GetLast()+1]) AliMUONTrack(trackCandidate);
96ebe67e 962 extrapTrackParamAtCluster1.SetRemovable(kTRUE);
963 newTrack->AddTrackParamAtCluster(extrapTrackParamAtCluster1,*clusterCh1);
964 extrapTrackParamAtCluster2.SetRemovable(kTRUE);
965 newTrack->AddTrackParamAtCluster(extrapTrackParamAtCluster2,*clusterCh2);
89c8d66d 966 newTrack->SetGlobalChi2(newTrack->GetGlobalChi2()+chi2WithTwoClusters);
019df241 967 fNRecTracks++;
968
96ebe67e 969 // Tag clusterCh1 as used
970 clusterCh1Used[iCluster1] = kTRUE;
019df241 971
972 // Printout for debuging
973 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
96ebe67e 974 cout << "FollowLinearTrackInStation: added two clusters in station(1..): " << nextStation+1 << endl;
019df241 975 if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump();
976 }
977
96ebe67e 978 } else if (chi2WithTwoClusters < bestChi2WithTwoClusters) {
979 // keep track of the best couple of clusters
980 bestChi2WithTwoClusters = chi2WithTwoClusters;
981 bestTrackParamAtCluster1 = extrapTrackParamAtCluster1;
982 bestTrackParamAtCluster2 = extrapTrackParamAtCluster2;
019df241 983 }
984
985 }
986
987 }
988
96ebe67e 989 // if no cluster found in chamber1 then consider to add clusterCh2 only
990 if (!foundSecondCluster) {
991 foundOneCluster = kTRUE;
019df241 992
a0dc65b4 993 if (GetRecoParam()->TrackAllTracks()) {
96ebe67e 994 // copy trackCandidate into a new track put at the end of fRecTracksPtr and add the new cluster
019df241 995 newTrack = new ((*fRecTracksPtr)[fRecTracksPtr->GetLast()+1]) AliMUONTrack(trackCandidate);
a0dc65b4 996 if (GetRecoParam()->RequestStation(nextStation))
9bf6860b 997 extrapTrackParamAtCluster2.SetRemovable(kFALSE);
998 else extrapTrackParamAtCluster2.SetRemovable(kTRUE);
96ebe67e 999 newTrack->AddTrackParamAtCluster(extrapTrackParamAtCluster2,*clusterCh2);
89c8d66d 1000 newTrack->SetGlobalChi2(newTrack->GetGlobalChi2()+chi2WithOneCluster);
019df241 1001 fNRecTracks++;
1002
1003 // Printout for debuging
1004 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
96ebe67e 1005 cout << "FollowLinearTrackInStation: added one cluster in chamber(1..): " << ch2+1 << endl;
019df241 1006 if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump();
1007 }
1008
96ebe67e 1009 } else if (!foundTwoClusters && chi2WithOneCluster < bestChi2WithOneCluster) {
1010 // keep track of the best cluster except if a couple of clusters has already been found
1011 bestChi2WithOneCluster = chi2WithOneCluster;
1012 bestTrackParamAtCluster1 = extrapTrackParamAtCluster2;
019df241 1013 }
1014
1015 }
1016
1017 }
1018
1019 }
1020
1021 // look for candidates in chamber 1 not already attached to a track
96ebe67e 1022 // if we want to keep all possible tracks or if no good couple of clusters has been found
a0dc65b4 1023 if (GetRecoParam()->TrackAllTracks() || !foundTwoClusters) {
019df241 1024
1025 // Printout for debuging
1026 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
96ebe67e 1027 cout << "FollowLinearTrackInStation: look for single cluster in chamber(1..): " << ch1+1 << endl;
019df241 1028 }
1029
1030 //Extrapolate trackCandidate to chamber "ch2"
3fe6651e 1031 AliMUONTrackExtrap::LinearExtrapToZCov(&trackParam, AliMUONConstants::DefaultChamberZ(ch2));
019df241 1032
1033 // add MCS effect for next step
1034 AliMUONTrackExtrap::AddMCSEffect(&trackParam,AliMUONConstants::ChamberThicknessInX0(),1.);
9bf6860b 1035
96ebe67e 1036 // reset cluster iterator of chamber 1
1037 nextInCh1.Reset();
1038 iCluster1 = -1;
1039
1040 // look for second candidates in chamber 1
1041 while ( ( clusterCh1 = static_cast<AliMUONVCluster*>(nextInCh1()) ) ) {
1042 iCluster1++;
019df241 1043
96ebe67e 1044 if (clusterCh1Used[iCluster1]) continue; // Skip clusters already used
019df241 1045
96ebe67e 1046 // try to add the current cluster fast
1047 if (!TryOneClusterFast(trackParam, clusterCh1)) continue;
9bf6860b 1048
96ebe67e 1049 // try to add the current cluster accuratly
1050 extrapTrackParamAtCluster1 = trackParam;
3fe6651e 1051 AliMUONTrackExtrap::LinearExtrapToZCov(&extrapTrackParamAtCluster1, clusterCh1->GetZ());
96ebe67e 1052 chi2WithOneCluster = TryOneCluster(extrapTrackParamAtCluster1, clusterCh1, extrapTrackParamAtCluster1);
9bf6860b 1053
96ebe67e 1054 // if good chi2 then consider to add clusterCh1
1055 // We do not try to attach a cluster in the other chamber too since it has already been done above
1056 if (chi2WithOneCluster < maxChi2WithOneCluster) {
1057 foundOneCluster = kTRUE;
019df241 1058
1059 // Printout for debuging
1060 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
96ebe67e 1061 cout << "FollowLinearTrackInStation: found one cluster in chamber(1..): " << ch1+1
1062 << " (Chi2 = " << chi2WithOneCluster << ")" << endl;
9bf6860b 1063 clusterCh1->Print();
019df241 1064 }
1065
a0dc65b4 1066 if (GetRecoParam()->TrackAllTracks()) {
96ebe67e 1067 // copy trackCandidate into a new track put at the end of fRecTracksPtr and add the new cluster
019df241 1068 newTrack = new ((*fRecTracksPtr)[fRecTracksPtr->GetLast()+1]) AliMUONTrack(trackCandidate);
a0dc65b4 1069 if (GetRecoParam()->RequestStation(nextStation))
9bf6860b 1070 extrapTrackParamAtCluster1.SetRemovable(kFALSE);
1071 else extrapTrackParamAtCluster1.SetRemovable(kTRUE);
96ebe67e 1072 newTrack->AddTrackParamAtCluster(extrapTrackParamAtCluster1,*clusterCh1);
89c8d66d 1073 newTrack->SetGlobalChi2(newTrack->GetGlobalChi2()+chi2WithOneCluster);
019df241 1074 fNRecTracks++;
1075
1076 // Printout for debuging
1077 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
96ebe67e 1078 cout << "FollowLinearTrackInStation: added one cluster in chamber(1..): " << ch1+1 << endl;
019df241 1079 if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump();
1080 }
1081
96ebe67e 1082 } else if (chi2WithOneCluster < bestChi2WithOneCluster) {
1083 // keep track of the best cluster except if a couple of clusters has already been found
1084 bestChi2WithOneCluster = chi2WithOneCluster;
1085 bestTrackParamAtCluster1 = extrapTrackParamAtCluster1;
019df241 1086 }
1087
1088 }
1089
1090 }
1091
1092 }
1093
1094 // fill out the best track if required else clean up the fRecTracksPtr array
a0dc65b4 1095 if (!GetRecoParam()->TrackAllTracks()) {
96ebe67e 1096 if (foundTwoClusters) {
1097 bestTrackParamAtCluster1.SetRemovable(kTRUE);
1098 trackCandidate.AddTrackParamAtCluster(bestTrackParamAtCluster1,*(bestTrackParamAtCluster1.GetClusterPtr()));
1099 bestTrackParamAtCluster2.SetRemovable(kTRUE);
1100 trackCandidate.AddTrackParamAtCluster(bestTrackParamAtCluster2,*(bestTrackParamAtCluster2.GetClusterPtr()));
89c8d66d 1101 trackCandidate.SetGlobalChi2(trackCandidate.GetGlobalChi2()+bestChi2WithTwoClusters);
019df241 1102
1103 // Printout for debuging
1104 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
96ebe67e 1105 cout << "FollowLinearTrackInStation: added the two best clusters in station(1..): " << nextStation+1 << endl;
019df241 1106 if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump();
1107 }
1108
96ebe67e 1109 } else if (foundOneCluster) {
a0dc65b4 1110 if (GetRecoParam()->RequestStation(nextStation))
9bf6860b 1111 bestTrackParamAtCluster1.SetRemovable(kFALSE);
1112 else bestTrackParamAtCluster1.SetRemovable(kTRUE);
96ebe67e 1113 trackCandidate.AddTrackParamAtCluster(bestTrackParamAtCluster1,*(bestTrackParamAtCluster1.GetClusterPtr()));
89c8d66d 1114 trackCandidate.SetGlobalChi2(trackCandidate.GetGlobalChi2()+bestChi2WithOneCluster);
019df241 1115
1116 // Printout for debuging
1117 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
96ebe67e 1118 cout << "FollowLinearTrackInStation: added the best cluster in chamber(1..): " << bestTrackParamAtCluster1.GetClusterPtr()->GetChamberId()+1 << endl;
019df241 1119 if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump();
1120 }
1121
dd230855 1122 } else {
96ebe67e 1123 delete [] clusterCh1Used;
dd230855 1124 return kFALSE;
1125 }
019df241 1126
96ebe67e 1127 } else if (foundOneCluster || foundTwoClusters) {
019df241 1128
1129 // remove obsolete track
1130 fRecTracksPtr->Remove(&trackCandidate);
1131 fNRecTracks--;
1132
dd230855 1133 } else {
96ebe67e 1134 delete [] clusterCh1Used;
dd230855 1135 return kFALSE;
1136 }
ea94c18b 1137
96ebe67e 1138 delete [] clusterCh1Used;
019df241 1139 return kTRUE;
ea94c18b 1140
1141}
1142
7332f213 1143//__________________________________________________________________________
1144void AliMUONVTrackReconstructor::ImproveTracks()
1145{
1146 /// Improve tracks by removing clusters with local chi2 highter than the defined cut
1147 /// Recompute track parameters and covariances at the remaining clusters
1148 AliDebug(1,"Enter ImproveTracks");
1149
1150 AliMUONTrack *track, *nextTrack;
1151
7332f213 1152 track = (AliMUONTrack*) fRecTracksPtr->First();
1153 while (track) {
1154
1155 // prepare next track in case the actual track is suppressed
1156 nextTrack = (AliMUONTrack*) fRecTracksPtr->After(track);
1157
1158 ImproveTrack(*track);
1159
1160 // remove track if improvement failed
1161 if (!track->IsImproved()) {
1162 fRecTracksPtr->Remove(track);
1163 fNRecTracks--;
1164 }
1165
1166 track = nextTrack;
1167 }
1168
1169 // compress the array in case of some tracks have been removed
1170 fRecTracksPtr->Compress();
1171
1172}
1173
1174//__________________________________________________________________________
1175void AliMUONVTrackReconstructor::Finalize()
1176{
1177 /// Recompute track parameters and covariances at each attached cluster from those at the first one
2e2d0c44 1178 /// Set the label pointing to the corresponding MC track
4ea3f013 1179 /// Remove the track if finalization failed
7332f213 1180
4ea3f013 1181 AliMUONTrack *track, *nextTrack;
1182 Bool_t trackRemoved = kFALSE;
7332f213 1183
1184 track = (AliMUONTrack*) fRecTracksPtr->First();
1185 while (track) {
1186
4ea3f013 1187 nextTrack = (AliMUONTrack*) fRecTracksPtr->After(track);
7332f213 1188
4ea3f013 1189 if (FinalizeTrack(*track)) track->FindMCLabel();
1190 else {
1191 fRecTracksPtr->Remove(track);
1192 fNRecTracks--;
1193 trackRemoved = kTRUE;
1194 }
2e2d0c44 1195
4ea3f013 1196 track = nextTrack;
7332f213 1197
1198 }
1199
4ea3f013 1200 // compress array of tracks if needed
1201 if (trackRemoved) fRecTracksPtr->Compress();
1202
7332f213 1203}
1204
1205//__________________________________________________________________________
7ec3b9cf 1206void AliMUONVTrackReconstructor::ValidateTracksWithTrigger(AliMUONVTrackStore& trackStore,
1207 const AliMUONVTriggerTrackStore& triggerTrackStore,
1208 const AliMUONVTriggerStore& triggerStore,
1209 const AliMUONTrackHitPattern& trackHitPattern)
8d0843c6 1210{
1211 /// Try to match track from tracking system with trigger track
70d92702 1212 AliCodeTimerAuto("",);
fda59e58 1213
683cb6c5 1214 trackHitPattern.ExecuteValidation(trackStore, triggerTrackStore, triggerStore);
8d0843c6 1215}
1216
ea94c18b 1217 //__________________________________________________________________________
1218void AliMUONVTrackReconstructor::EventReconstructTrigger(const AliMUONTriggerCircuit& circuit,
1219 const AliMUONVTriggerStore& triggerStore,
1220 AliMUONVTriggerTrackStore& triggerTrackStore)
8d0843c6 1221{
71a2d3aa 1222 /// To make the trigger tracks from Local Trigger
7ec3b9cf 1223 AliDebug(1, "");
70d92702 1224 AliCodeTimerAuto("",);
7ec3b9cf 1225
1226 AliMUONGlobalTrigger* globalTrigger = triggerStore.Global();
e6b25a6e 1227
7ec3b9cf 1228 UChar_t gloTrigPat = 0;
e6b25a6e 1229
7ec3b9cf 1230 if (globalTrigger)
1231 {
1232 gloTrigPat = globalTrigger->GetGlobalResponse();
e6b25a6e 1233 }
1234
7ec3b9cf 1235 TIter next(triggerStore.CreateIterator());
1236 AliMUONLocalTrigger* locTrg(0x0);
8d0843c6 1237
e6b25a6e 1238 Float_t z11 = AliMUONConstants::DefaultChamberZ(10);
1239 Float_t z21 = AliMUONConstants::DefaultChamberZ(12);
7cf63da6 1240
7ec3b9cf 1241 AliMUONTriggerTrack triggerTrack;
1242
1243 while ( ( locTrg = static_cast<AliMUONLocalTrigger*>(next()) ) )
1244 {
d72d7b9e 1245 Bool_t xTrig=locTrg->IsTrigX();
1246 Bool_t yTrig=locTrg->IsTrigY();
7ec3b9cf 1247
32ab62c9 1248 Int_t localBoardId = locTrg->LoCircuit();
7ec3b9cf 1249
1250 if (xTrig && yTrig)
1251 { // make Trigger Track if trigger in X and Y
8b0baca4 1252
32ab62c9 1253 Float_t y11 = circuit.GetY11Pos(localBoardId, locTrg->LoStripX());
7ec3b9cf 1254 // need first to convert deviation to [0-30]
1255 // (see AliMUONLocalTriggerBoard::LocalTrigger)
d72d7b9e 1256 Int_t deviation = locTrg->GetDeviation();
7ec3b9cf 1257 Int_t stripX21 = locTrg->LoStripX()+deviation+1;
32ab62c9 1258 Float_t y21 = circuit.GetY21Pos(localBoardId, stripX21);
1259 Float_t x11 = circuit.GetX11Pos(localBoardId, locTrg->LoStripY());
7ec3b9cf 1260
1261 AliDebug(1, Form(" MakeTriggerTrack %d %d %d %d %f %f %f \n",locTrg->LoCircuit(),
1262 locTrg->LoStripX(),locTrg->LoStripX()+locTrg->LoDev()+1,locTrg->LoStripY(),y11, y21, x11));
1263
1264 Float_t thetax = TMath::ATan2( x11 , z11 );
1265 Float_t thetay = TMath::ATan2( (y21-y11) , (z21-z11) );
abc2458f 1266
1267 CorrectThetaRange(thetax);
1268 CorrectThetaRange(thetay);
7ec3b9cf 1269
1270 triggerTrack.SetX11(x11);
1271 triggerTrack.SetY11(y11);
1272 triggerTrack.SetThetax(thetax);
1273 triggerTrack.SetThetay(thetay);
1274 triggerTrack.SetGTPattern(gloTrigPat);
32ab62c9 1275 triggerTrack.SetLoTrgNum(localBoardId);
7ec3b9cf 1276
1277 triggerTrackStore.Add(triggerTrack);
1278 } // board is fired
e6b25a6e 1279 } // end of loop on Local Trigger
8d0843c6 1280}
ea94c18b 1281
abc2458f 1282//__________________________________________________________________________
1283void AliMUONVTrackReconstructor::CorrectThetaRange(Float_t& theta)
1284{
1285 /// The angles of the trigger tracks, obtained with ATan2,
1286 /// have values around +pi and -pi. On the contrary, the angles
1287 /// used in the tracker tracks have values around 0.
1288 /// This function sets the same range for the trigger tracks angles.
1289 if (theta < -TMath::PiOver2()) theta += TMath::Pi();
1290 else if(theta > TMath::PiOver2()) theta -= TMath::Pi();
1291}