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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 //__________________________________________________________________________
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,"");
b709ac13 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);
7332f213 182 track->SetUniqueID(i+1);
96ebe67e 183 trackStore.Add(*track);
184 }
ea94c18b 185}
186
6b191dea 187//__________________________________________________________________________
188Bool_t AliMUONVTrackReconstructor::IsAcceptable(AliMUONTrackParam &trackParam)
189{
190 /// Return kTRUE if the track is within given limits on momentum/angle/origin
191
192 const TMatrixD& kParamCov = trackParam.GetCovariances();
193 Int_t chamber = trackParam.GetClusterPtr()->GetChamberId();
194 Double_t z = trackParam.GetZ();
195 Double_t sigmaCut = GetRecoParam()->GetSigmaCutForTracking();
196
197 // MCS dipersion
198 Double_t angleMCS2 = 0.;
199 if (AliMUONTrackExtrap::IsFieldON() && chamber < 6)
200 angleMCS2 = AliMUONTrackExtrap::GetMCSAngle2(trackParam, AliMUONConstants::ChamberThicknessInX0(), 1.);
201 else angleMCS2 = fMaxMCSAngle2;
202 Double_t impactMCS2 = 0.;
203 if (!GetRecoParam()->SelectOnTrackSlope()) for (Int_t iCh=0; iCh<=chamber; iCh++)
204 impactMCS2 += AliMUONConstants::DefaultChamberZ(chamber) * AliMUONConstants::DefaultChamberZ(chamber) * angleMCS2;
205
206 // ------ track selection in non bending direction ------
207 if (GetRecoParam()->SelectOnTrackSlope()) {
208
209 // check if non bending slope is within tolerances
210 Double_t nonBendingSlopeErr = TMath::Sqrt(kParamCov(1,1) + (chamber + 1.) * angleMCS2);
211 if ((TMath::Abs(trackParam.GetNonBendingSlope()) - sigmaCut * nonBendingSlopeErr) > GetRecoParam()->GetMaxNonBendingSlope()) return kFALSE;
212
213 } else {
214
215 // or check if non bending impact parameter is within tolerances
216 Double_t nonBendingImpactParam = TMath::Abs(trackParam.GetNonBendingCoor() - z * trackParam.GetNonBendingSlope());
217 Double_t nonBendingImpactParamErr = TMath::Sqrt(kParamCov(0,0) + z * z * kParamCov(1,1) - 2. * z * kParamCov(0,1) + impactMCS2);
218 if ((nonBendingImpactParam - sigmaCut * nonBendingImpactParamErr) > (3. * GetRecoParam()->GetNonBendingVertexDispersion())) return kFALSE;
219
220 }
221
222 // ------ track selection in bending direction ------
223 if (AliMUONTrackExtrap::IsFieldON()) { // depending whether the field is ON or OFF
224
225 // check if bending momentum is within tolerances
226 Double_t bendingMomentum = TMath::Abs(1. / trackParam.GetInverseBendingMomentum());
227 Double_t bendingMomentumErr = TMath::Sqrt(kParamCov(4,4)) * bendingMomentum * bendingMomentum;
228 if (chamber < 6 && (bendingMomentum + sigmaCut * bendingMomentumErr) < GetRecoParam()->GetMinBendingMomentum()) return kFALSE;
229 else if ((bendingMomentum + 3. * bendingMomentumErr) < GetRecoParam()->GetMinBendingMomentum()) return kFALSE;
230
231 } else {
232
233 if (GetRecoParam()->SelectOnTrackSlope()) {
234
235 // check if bending slope is within tolerances
236 Double_t bendingSlopeErr = TMath::Sqrt(kParamCov(3,3) + (chamber + 1.) * angleMCS2);
237 if ((TMath::Abs(trackParam.GetBendingSlope()) - sigmaCut * bendingSlopeErr) > GetRecoParam()->GetMaxBendingSlope()) return kFALSE;
238
239 } else {
240
241 // or check if bending impact parameter is within tolerances
242 Double_t bendingImpactParam = TMath::Abs(trackParam.GetBendingCoor() - z * trackParam.GetBendingSlope());
243 Double_t bendingImpactParamErr = TMath::Sqrt(kParamCov(2,2) + z * z * kParamCov(3,3) - 2. * z * kParamCov(2,3) + impactMCS2);
244 if ((bendingImpactParam - sigmaCut * bendingImpactParamErr) > (3. * GetRecoParam()->GetBendingVertexDispersion())) return kFALSE;
245
246 }
247
248 }
249
250 return kTRUE;
251
252}
253
254//__________________________________________________________________________
9bf6860b 255TClonesArray* AliMUONVTrackReconstructor::MakeSegmentsBetweenChambers(const AliMUONVClusterStore& clusterStore, Int_t ch1, Int_t ch2)
8d0843c6 256{
9bf6860b 257 /// To make the list of segments from the list of clusters in the 2 given chambers.
208f139e 258 /// Return a new TClonesArray of segments.
259 /// It is the responsibility of the user to delete it afterward.
9bf6860b 260 AliDebug(1,Form("Enter MakeSegmentsBetweenChambers (1..) %d-%d", ch1+1, ch2+1));
6b191dea 261 AliCodeTimerAuto("");
208f139e 262
96ebe67e 263 AliMUONVCluster *cluster1, *cluster2;
208f139e 264 AliMUONObjectPair *segment;
6b191dea 265 Double_t z1 = 0., z2 = 0., dZ = 0.;
266 Double_t nonBendingSlope = 0., nonBendingSlopeErr = 0., nonBendingImpactParam = 0., nonBendingImpactParamErr = 0.;
267 Double_t bendingSlope = 0., bendingSlopeErr = 0., bendingImpactParam = 0., bendingImpactParamErr = 0., bendingImpactParamErr2 = 0.;
268 Double_t bendingMomentum = 0., bendingMomentumErr = 0.;
269 Double_t bendingVertexDispersion2 = GetRecoParam()->GetBendingVertexDispersion() * GetRecoParam()->GetBendingVertexDispersion();
270 Double_t impactMCS2 = 0; // maximum impact parameter dispersion**2 due to MCS in chamber
271 if (!GetRecoParam()->SelectOnTrackSlope() || AliMUONTrackExtrap::IsFieldON()) for (Int_t iCh=0; iCh<=ch1; iCh++)
272 impactMCS2 += AliMUONConstants::DefaultChamberZ(iCh) * AliMUONConstants::DefaultChamberZ(iCh) * fMaxMCSAngle2;
273 Double_t sigmaCut = GetRecoParam()->GetSigmaCutForTracking();
7ec3b9cf 274
96ebe67e 275 // Create iterators to loop over clusters in both chambers
276 TIter nextInCh1(clusterStore.CreateChamberIterator(ch1,ch1));
277 TIter nextInCh2(clusterStore.CreateChamberIterator(ch2,ch2));
278
208f139e 279 // list of segments
96ebe67e 280 TClonesArray *segments = new TClonesArray("AliMUONObjectPair", 100);
7ec3b9cf 281
96ebe67e 282 // Loop over clusters in the first chamber of the station
283 while ( ( cluster1 = static_cast<AliMUONVCluster*>(nextInCh1()) ) ) {
6b191dea 284 z1 = cluster1->GetZ();
96ebe67e 285
286 // reset cluster iterator of chamber 2
287 nextInCh2.Reset();
288
289 // Loop over clusters in the second chamber of the station
290 while ( ( cluster2 = static_cast<AliMUONVCluster*>(nextInCh2()) ) ) {
6b191dea 291 z2 = cluster2->GetZ();
292 dZ = z1 - z2;
96ebe67e 293
6b191dea 294 // ------ track selection in non bending direction ------
295 nonBendingSlope = (cluster1->GetX() - cluster2->GetX()) / dZ;
296 if (GetRecoParam()->SelectOnTrackSlope()) {
9f093251 297
6b191dea 298 // check if non bending slope is within tolerances
299 nonBendingSlopeErr = TMath::Sqrt((cluster1->GetErrX2() + cluster2->GetErrX2()) / dZ / dZ + (ch1 + 1.) * fMaxMCSAngle2);
300 if ((TMath::Abs(nonBendingSlope) - sigmaCut * nonBendingSlopeErr) > GetRecoParam()->GetMaxNonBendingSlope()) continue;
9f093251 301
6b191dea 302 } else {
303
304 // or check if non bending impact parameter is within tolerances
305 nonBendingImpactParam = TMath::Abs(cluster1->GetX() - cluster1->GetZ() * nonBendingSlope);
306 nonBendingImpactParamErr = TMath::Sqrt((z1 * z1 * cluster2->GetErrX2() + z2 * z2 * cluster1->GetErrX2()) / dZ / dZ + impactMCS2);
307 if ((nonBendingImpactParam - sigmaCut * nonBendingImpactParamErr) > (3. * GetRecoParam()->GetNonBendingVertexDispersion())) continue;
308
309 }
310
311 // ------ track selection in bending direction ------
312 bendingSlope = (cluster1->GetY() - cluster2->GetY()) / dZ;
313 if (AliMUONTrackExtrap::IsFieldON()) { // depending whether the field is ON or OFF
9f093251 314
315 // check if bending momentum is within tolerances
6b191dea 316 bendingImpactParam = cluster1->GetY() - cluster1->GetZ() * bendingSlope;
317 bendingImpactParamErr2 = (z1 * z1 * cluster2->GetErrY2() + z2 * z2 * cluster1->GetErrY2()) / dZ / dZ + impactMCS2;
318 bendingMomentum = TMath::Abs(AliMUONTrackExtrap::GetBendingMomentumFromImpactParam(bendingImpactParam));
319 bendingMomentumErr = TMath::Sqrt((bendingVertexDispersion2 + bendingImpactParamErr2) /
320 bendingImpactParam / bendingImpactParam + 0.01) * bendingMomentum;
321 if ((bendingMomentum + 3. * bendingMomentumErr) < GetRecoParam()->GetMinBendingMomentum()) continue;
96ebe67e 322
9f093251 323 } else {
324
6b191dea 325 if (GetRecoParam()->SelectOnTrackSlope()) {
326
327 // check if bending slope is within tolerances
328 bendingSlopeErr = TMath::Sqrt((cluster1->GetErrY2() + cluster2->GetErrY2()) / dZ / dZ + (ch1 + 1.) * fMaxMCSAngle2);
329 if ((TMath::Abs(bendingSlope) - sigmaCut * bendingSlopeErr) > GetRecoParam()->GetMaxBendingSlope()) continue;
330
331 } else {
332
333 // or check if bending impact parameter is within tolerances
334 bendingImpactParam = TMath::Abs(cluster1->GetY() - cluster1->GetZ() * bendingSlope);
335 bendingImpactParamErr = TMath::Sqrt((z1 * z1 * cluster2->GetErrY2() + z2 * z2 * cluster1->GetErrY2()) / dZ / dZ + impactMCS2);
336 if ((bendingImpactParam - sigmaCut * bendingImpactParamErr) > (3. * GetRecoParam()->GetBendingVertexDispersion())) continue;
337
338 }
339
9f093251 340 }
6b191dea 341
9f093251 342 // make new segment
343 segment = new ((*segments)[segments->GetLast()+1]) AliMUONObjectPair(cluster1, cluster2, kFALSE, kFALSE);
344
345 // Printout for debug
346 if (AliLog::GetGlobalDebugLevel() > 1) {
347 cout << "segmentIndex(0...): " << segments->GetLast() << endl;
348 segment->Dump();
349 cout << "Cluster in first chamber" << endl;
350 cluster1->Print();
351 cout << "Cluster in second chamber" << endl;
352 cluster2->Print();
8d0843c6 353 }
96ebe67e 354
355 }
356
357 }
358
359 // Printout for debug
9bf6860b 360 AliDebug(1,Form("chambers%d-%d: NSegments = %d ", ch1+1, ch2+1, segments->GetEntriesFast()));
96ebe67e 361
208f139e 362 return segments;
8d0843c6 363}
364
89c8d66d 365 //__________________________________________________________________________
366void AliMUONVTrackReconstructor::RemoveUsedSegments(TClonesArray& segments)
367{
368 /// To remove pairs of clusters already attached to a track
369 AliDebug(1,"Enter RemoveUsedSegments");
370 Int_t nSegments = segments.GetEntriesFast();
371 Int_t nTracks = fRecTracksPtr->GetEntriesFast();
372 AliMUONObjectPair *segment;
373 AliMUONTrack *track;
374 AliMUONVCluster *cluster, *cluster1, *cluster2;
375 Bool_t foundCluster1, foundCluster2, removeSegment;
376
377 // Loop over segments
378 for (Int_t iSegment=0; iSegment<nSegments; iSegment++) {
379 segment = (AliMUONObjectPair*) segments.UncheckedAt(iSegment);
380
381 cluster1 = (AliMUONVCluster*) segment->First();
382 cluster2 = (AliMUONVCluster*) segment->Second();
383 removeSegment = kFALSE;
384
385 // Loop over tracks
386 for (Int_t iTrack = 0; iTrack < nTracks; iTrack++) {
387 track = (AliMUONTrack*) fRecTracksPtr->UncheckedAt(iTrack);
388
389 // skip empty slot
390 if (!track) continue;
391
392 foundCluster1 = kFALSE;
393 foundCluster2 = kFALSE;
394
395 // Loop over clusters
396 Int_t nClusters = track->GetNClusters();
397 for (Int_t iCluster = 0; iCluster < nClusters; iCluster++) {
398 cluster = ((AliMUONTrackParam*) track->GetTrackParamAtCluster()->UncheckedAt(iCluster))->GetClusterPtr();
399
400 // check if both clusters are in that track
401 if (cluster == cluster1) foundCluster1 = kTRUE;
402 else if (cluster == cluster2) foundCluster2 = kTRUE;
403
404 if (foundCluster1 && foundCluster2) {
405 removeSegment = kTRUE;
406 break;
407 }
408
409 }
410
411 if (removeSegment) break;
412
413 }
414
415 if (removeSegment) segments.RemoveAt(iSegment);
416
417 }
418
419 segments.Compress();
420
421 // Printout for debug
422 AliDebug(1,Form("NSegments = %d ", segments.GetEntriesFast()));
423}
424
ea94c18b 425 //__________________________________________________________________________
426void AliMUONVTrackReconstructor::RemoveIdenticalTracks()
427{
428 /// To remove identical tracks:
96ebe67e 429 /// Tracks are considered identical if they have all their clusters in common.
430 /// One keeps the track with the larger number of clusters if need be
89c8d66d 431 AliMUONTrack *track1, *track2;
432 Int_t nTracks = fRecTracksPtr->GetEntriesFast();
96ebe67e 433 Int_t clustersInCommon, nClusters1, nClusters2;
ea94c18b 434 // Loop over first track of the pair
89c8d66d 435 for (Int_t iTrack1 = 0; iTrack1 < nTracks; iTrack1++) {
436 track1 = (AliMUONTrack*) fRecTracksPtr->UncheckedAt(iTrack1);
437 // skip empty slot
438 if (!track1) continue;
96ebe67e 439 nClusters1 = track1->GetNClusters();
ea94c18b 440 // Loop over second track of the pair
89c8d66d 441 for (Int_t iTrack2 = iTrack1+1; iTrack2 < nTracks; iTrack2++) {
442 track2 = (AliMUONTrack*) fRecTracksPtr->UncheckedAt(iTrack2);
443 // skip empty slot
444 if (!track2) continue;
96ebe67e 445 nClusters2 = track2->GetNClusters();
446 // number of clusters in common between two tracks
447 clustersInCommon = track1->ClustersInCommon(track2);
ea94c18b 448 // check for identical tracks
96ebe67e 449 if ((clustersInCommon == nClusters1) || (clustersInCommon == nClusters2)) {
ea94c18b 450 // decide which track to remove
96ebe67e 451 if (nClusters2 > nClusters1) {
ea94c18b 452 // remove track1 and continue the first loop with the track next to track1
89c8d66d 453 fRecTracksPtr->RemoveAt(iTrack1);
ea94c18b 454 fNRecTracks--;
ea94c18b 455 break;
456 } else {
457 // remove track2 and continue the second loop with the track next to track2
89c8d66d 458 fRecTracksPtr->RemoveAt(iTrack2);
ea94c18b 459 fNRecTracks--;
460 }
89c8d66d 461 }
ea94c18b 462 } // track2
ea94c18b 463 } // track1
89c8d66d 464 fRecTracksPtr->Compress(); // this is essential to retrieve the TClonesArray afterwards
ea94c18b 465}
466
467 //__________________________________________________________________________
468void AliMUONVTrackReconstructor::RemoveDoubleTracks()
469{
470 /// To remove double tracks:
96ebe67e 471 /// Tracks are considered identical if more than half of the clusters of the track
472 /// which has the smaller number of clusters are in common with the other track.
473 /// Among two identical tracks, one keeps the track with the larger number of clusters
ea94c18b 474 /// or, if these numbers are equal, the track with the minimum chi2.
89c8d66d 475 AliMUONTrack *track1, *track2;
476 Int_t nTracks = fRecTracksPtr->GetEntriesFast();
477 Int_t clustersInCommon2, nClusters1, nClusters2;
ea94c18b 478 // Loop over first track of the pair
89c8d66d 479 for (Int_t iTrack1 = 0; iTrack1 < nTracks; iTrack1++) {
480 track1 = (AliMUONTrack*) fRecTracksPtr->UncheckedAt(iTrack1);
481 // skip empty slot
482 if (!track1) continue;
96ebe67e 483 nClusters1 = track1->GetNClusters();
ea94c18b 484 // Loop over second track of the pair
89c8d66d 485 for (Int_t iTrack2 = iTrack1+1; iTrack2 < nTracks; iTrack2++) {
486 track2 = (AliMUONTrack*) fRecTracksPtr->UncheckedAt(iTrack2);
487 // skip empty slot
488 if (!track2) continue;
96ebe67e 489 nClusters2 = track2->GetNClusters();
490 // number of clusters in common between two tracks
89c8d66d 491 clustersInCommon2 = 2 * track1->ClustersInCommon(track2);
ea94c18b 492 // check for identical tracks
89c8d66d 493 if (clustersInCommon2 > nClusters1 || clustersInCommon2 > nClusters2) {
ea94c18b 494 // decide which track to remove
96ebe67e 495 if ((nClusters1 > nClusters2) || ((nClusters1 == nClusters2) && (track1->GetGlobalChi2() <= track2->GetGlobalChi2()))) {
ea94c18b 496 // remove track2 and continue the second loop with the track next to track2
89c8d66d 497 fRecTracksPtr->RemoveAt(iTrack2);
c59f70b9 498 fNRecTracks--;
499 } else {
500 // else remove track1 and continue the first loop with the track next to track1
89c8d66d 501 fRecTracksPtr->RemoveAt(iTrack1);
c59f70b9 502 fNRecTracks--;
c59f70b9 503 break;
504 }
89c8d66d 505 }
c59f70b9 506 } // track2
c59f70b9 507 } // track1
89c8d66d 508 fRecTracksPtr->Compress(); // this is essential to retrieve the TClonesArray afterwards
c59f70b9 509}
510
511 //__________________________________________________________________________
512void AliMUONVTrackReconstructor::RemoveConnectedTracks(Bool_t inSt345)
513{
514 /// To remove double tracks:
515 /// Tracks are considered identical if they share 1 cluster or more.
516 /// If inSt345=kTRUE only stations 3, 4 and 5 are considered.
517 /// Among two identical tracks, one keeps the track with the larger number of clusters
518 /// or, if these numbers are equal, the track with the minimum chi2.
519 AliMUONTrack *track1, *track2, *trackToRemove;
520 Int_t clustersInCommon, nClusters1, nClusters2;
521 Bool_t removedTrack1;
522 // Loop over first track of the pair
523 track1 = (AliMUONTrack*) fRecTracksPtr->First();
524 while (track1) {
525 removedTrack1 = kFALSE;
526 nClusters1 = track1->GetNClusters();
527 // Loop over second track of the pair
528 track2 = (AliMUONTrack*) fRecTracksPtr->After(track1);
529 while (track2) {
530 nClusters2 = track2->GetNClusters();
531 // number of clusters in common between two tracks
89c8d66d 532 if (inSt345) clustersInCommon = track1->ClustersInCommonInSt345(track2);
533 else clustersInCommon = track1->ClustersInCommon(track2);
c59f70b9 534 // check for identical tracks
535 if (clustersInCommon > 0) {
536 // decide which track to remove
537 if ((nClusters1 > nClusters2) || ((nClusters1 == nClusters2) && (track1->GetGlobalChi2() <= track2->GetGlobalChi2()))) {
538 // remove track2 and continue the second loop with the track next to track2
539 trackToRemove = track2;
540 track2 = (AliMUONTrack*) fRecTracksPtr->After(track2);
541 fRecTracksPtr->Remove(trackToRemove);
ea94c18b 542 fRecTracksPtr->Compress(); // this is essential to retrieve the TClonesArray afterwards
543 fNRecTracks--;
544 } else {
545 // else remove track1 and continue the first loop with the track next to track1
546 trackToRemove = track1;
547 track1 = (AliMUONTrack*) fRecTracksPtr->After(track1);
548 fRecTracksPtr->Remove(trackToRemove);
549 fRecTracksPtr->Compress(); // this is essential to retrieve the TClonesArray afterwards
550 fNRecTracks--;
551 removedTrack1 = kTRUE;
552 break;
553 }
554 } else track2 = (AliMUONTrack*) fRecTracksPtr->After(track2);
555 } // track2
556 if (removedTrack1) continue;
557 track1 = (AliMUONTrack*) fRecTracksPtr->After(track1);
558 } // track1
559 return;
560}
561
1fef78c8 562 //__________________________________________________________________________
9bf6860b 563void AliMUONVTrackReconstructor::AskForNewClustersInChamber(const AliMUONTrackParam &trackParam,
564 AliMUONVClusterStore& clusterStore, Int_t chamber)
1fef78c8 565{
566 /// Ask the clustering to reconstruct new clusters around the track candidate position
1fef78c8 567
9bf6860b 568 // check if the current chamber is useable
a0dc65b4 569 if (!fClusterServer || !GetRecoParam()->UseChamber(chamber)) return;
1fef78c8 570
9bf6860b 571 // maximum distance between the center of the chamber and a detection element
572 // (accounting for the inclination of the chamber)
b89ac3d6 573 static const Double_t kMaxDZ = 15.; // 15 cm
1fef78c8 574
9bf6860b 575 // extrapolate track parameters to the chamber
576 AliMUONTrackParam extrapTrackParam(trackParam);
577 AliMUONTrackExtrap::ExtrapToZCov(&extrapTrackParam, AliMUONConstants::DefaultChamberZ(chamber));
578
6b191dea 579 // build the searching area using the track and chamber resolutions and the maximum-distance-to-track value
9bf6860b 580 const TMatrixD& kParamCov = extrapTrackParam.GetCovariances();
6b191dea 581 Double_t errX2 = kParamCov(0,0) + kMaxDZ * kMaxDZ * kParamCov(1,1) + 2. * kMaxDZ * TMath::Abs(kParamCov(0,1)) +
582 GetRecoParam()->GetDefaultNonBendingReso(chamber) * GetRecoParam()->GetDefaultNonBendingReso(chamber);
583 Double_t errY2 = kParamCov(2,2) + kMaxDZ * kMaxDZ * kParamCov(3,3) + 2. * kMaxDZ * TMath::Abs(kParamCov(2,3)) +
584 GetRecoParam()->GetDefaultBendingReso(chamber) * GetRecoParam()->GetDefaultBendingReso(chamber);
b89ac3d6 585 Double_t dX = TMath::Abs(trackParam.GetNonBendingSlope()) * kMaxDZ +
a0dc65b4 586 GetRecoParam()->GetMaxNonBendingDistanceToTrack() +
6b191dea 587 GetRecoParam()->GetSigmaCutForTracking() * TMath::Sqrt(2. * errX2);
b89ac3d6 588 Double_t dY = TMath::Abs(trackParam.GetBendingSlope()) * kMaxDZ +
a0dc65b4 589 GetRecoParam()->GetMaxBendingDistanceToTrack() +
6b191dea 590 GetRecoParam()->GetSigmaCutForTracking() * TMath::Sqrt(2. * errY2);
6e97fbb8 591 AliMpArea area(extrapTrackParam.GetNonBendingCoor(),
592 extrapTrackParam.GetBendingCoor(),
593 dX, dY);
1fef78c8 594
595 // ask to cluterize in the given area of the given chamber
35be7ed7 596 fClusterServer->Clusterize(chamber, clusterStore, area, GetRecoParam());
1fef78c8 597
9bf6860b 598}
599
600 //__________________________________________________________________________
601void AliMUONVTrackReconstructor::AskForNewClustersInStation(const AliMUONTrackParam &trackParam,
602 AliMUONVClusterStore& clusterStore, Int_t station)
603{
604 /// Ask the clustering to reconstruct new clusters around the track candidate position
605 /// in the 2 chambers of the given station
606 AskForNewClustersInChamber(trackParam, clusterStore, 2*station+1);
607 AskForNewClustersInChamber(trackParam, clusterStore, 2*station);
1fef78c8 608}
609
ea94c18b 610 //__________________________________________________________________________
96ebe67e 611Double_t AliMUONVTrackReconstructor::TryOneCluster(const AliMUONTrackParam &trackParam, AliMUONVCluster* cluster,
1fef78c8 612 AliMUONTrackParam &trackParamAtCluster, Bool_t updatePropagator)
ea94c18b 613{
96ebe67e 614/// Test the compatibility between the track and the cluster (using trackParam's covariance matrix):
ea94c18b 615/// return the corresponding Chi2
96ebe67e 616/// return trackParamAtCluster
ea94c18b 617
96ebe67e 618 // extrapolate track parameters and covariances at the z position of the tested cluster
619 trackParamAtCluster = trackParam;
620 AliMUONTrackExtrap::ExtrapToZCov(&trackParamAtCluster, cluster->GetZ(), updatePropagator);
ea94c18b 621
96ebe67e 622 // set pointer to cluster into trackParamAtCluster
623 trackParamAtCluster.SetClusterPtr(cluster);
ea94c18b 624
96ebe67e 625 // Set differences between trackParam and cluster in the bending and non bending directions
626 Double_t dX = cluster->GetX() - trackParamAtCluster.GetNonBendingCoor();
627 Double_t dY = cluster->GetY() - trackParamAtCluster.GetBendingCoor();
ea94c18b 628
019df241 629 // Calculate errors and covariances
96ebe67e 630 const TMatrixD& kParamCov = trackParamAtCluster.GetCovariances();
631 Double_t sigmaX2 = kParamCov(0,0) + cluster->GetErrX2();
632 Double_t sigmaY2 = kParamCov(2,2) + cluster->GetErrY2();
6b191dea 633 Double_t covXY = kParamCov(0,2);
634 Double_t det = sigmaX2 * sigmaY2 - covXY * covXY;
019df241 635
636 // Compute chi2
6b191dea 637 if (det == 0.) return 1.e10;
638 return (dX * dX * sigmaY2 + dY * dY * sigmaX2 - 2. * dX * dY * covXY) / det;
019df241 639
640}
641
642 //__________________________________________________________________________
5a240757 643Bool_t AliMUONVTrackReconstructor::TryOneClusterFast(const AliMUONTrackParam &trackParam, const AliMUONVCluster* cluster)
019df241 644{
9bf6860b 645/// Test the compatibility between the track and the cluster
6b191dea 646/// given the track and cluster resolutions + the maximum-distance-to-track value
9bf6860b 647/// and assuming linear propagation of the track:
019df241 648/// return kTRUE if they are compatibles
649
96ebe67e 650 Double_t dZ = cluster->GetZ() - trackParam.GetZ();
651 Double_t dX = cluster->GetX() - (trackParam.GetNonBendingCoor() + trackParam.GetNonBendingSlope() * dZ);
652 Double_t dY = cluster->GetY() - (trackParam.GetBendingCoor() + trackParam.GetBendingSlope() * dZ);
9bf6860b 653 const TMatrixD& kParamCov = trackParam.GetCovariances();
6b191dea 654 Double_t errX2 = kParamCov(0,0) + dZ * dZ * kParamCov(1,1) + 2. * dZ * kParamCov(0,1) + cluster->GetErrX2();
655 Double_t errY2 = kParamCov(2,2) + dZ * dZ * kParamCov(3,3) + 2. * dZ * kParamCov(2,3) + cluster->GetErrY2();
9bf6860b 656
6b191dea 657 Double_t dXmax = GetRecoParam()->GetSigmaCutForTracking() * TMath::Sqrt(2. * errX2) +
a0dc65b4 658 GetRecoParam()->GetMaxNonBendingDistanceToTrack();
6b191dea 659 Double_t dYmax = GetRecoParam()->GetSigmaCutForTracking() * TMath::Sqrt(2. * errY2) +
a0dc65b4 660 GetRecoParam()->GetMaxBendingDistanceToTrack();
019df241 661
9bf6860b 662 if (TMath::Abs(dX) > dXmax || TMath::Abs(dY) > dYmax) return kFALSE;
019df241 663
664 return kTRUE;
665
666}
667
668 //__________________________________________________________________________
96ebe67e 669Double_t AliMUONVTrackReconstructor::TryTwoClustersFast(const AliMUONTrackParam &trackParamAtCluster1, AliMUONVCluster* cluster2,
670 AliMUONTrackParam &trackParamAtCluster2)
019df241 671{
96ebe67e 672/// Test the compatibility between the track and the 2 clusters together (using trackParam's covariance matrix)
673/// assuming linear propagation between the two clusters:
674/// return the corresponding Chi2 accounting for covariances between the 2 clusters
675/// return trackParamAtCluster2
019df241 676
96ebe67e 677 // extrapolate linearly track parameters and covariances at the z position of the second cluster
678 trackParamAtCluster2 = trackParamAtCluster1;
3fe6651e 679 AliMUONTrackExtrap::LinearExtrapToZCov(&trackParamAtCluster2, cluster2->GetZ());
019df241 680
96ebe67e 681 // set pointer to cluster2 into trackParamAtCluster2
682 trackParamAtCluster2.SetClusterPtr(cluster2);
019df241 683
96ebe67e 684 // Set differences between track and clusters in the bending and non bending directions
685 AliMUONVCluster* cluster1 = trackParamAtCluster1.GetClusterPtr();
686 Double_t dX1 = cluster1->GetX() - trackParamAtCluster1.GetNonBendingCoor();
687 Double_t dX2 = cluster2->GetX() - trackParamAtCluster2.GetNonBendingCoor();
688 Double_t dY1 = cluster1->GetY() - trackParamAtCluster1.GetBendingCoor();
689 Double_t dY2 = cluster2->GetY() - trackParamAtCluster2.GetBendingCoor();
019df241 690
691 // Calculate errors and covariances
96ebe67e 692 const TMatrixD& kParamCov1 = trackParamAtCluster1.GetCovariances();
693 const TMatrixD& kParamCov2 = trackParamAtCluster2.GetCovariances();
694 Double_t dZ = trackParamAtCluster2.GetZ() - trackParamAtCluster1.GetZ();
695 Double_t sigma2X1 = kParamCov1(0,0) + cluster1->GetErrX2();
696 Double_t sigma2X2 = kParamCov2(0,0) + cluster2->GetErrX2();
019df241 697 Double_t covX1X2 = kParamCov1(0,0) + dZ * kParamCov1(0,1);
96ebe67e 698 Double_t sigma2Y1 = kParamCov1(2,2) + cluster1->GetErrY2();
699 Double_t sigma2Y2 = kParamCov2(2,2) + cluster2->GetErrY2();
019df241 700 Double_t covY1Y2 = kParamCov1(2,2) + dZ * kParamCov1(2,3);
701
702 // Compute chi2
703 Double_t detX = sigma2X1 * sigma2X2 - covX1X2 * covX1X2;
704 Double_t detY = sigma2Y1 * sigma2Y2 - covY1Y2 * covY1Y2;
705 if (detX == 0. || detY == 0.) return 1.e10;
706 return (dX1 * dX1 * sigma2X2 + dX2 * dX2 * sigma2X1 - 2. * dX1 * dX2 * covX1X2) / detX
707 + (dY1 * dY1 * sigma2Y2 + dY2 * dY2 * sigma2Y1 - 2. * dY1 * dY2 * covY1Y2) / detY;
708
709}
710
711 //__________________________________________________________________________
9bf6860b 712Bool_t AliMUONVTrackReconstructor::FollowLinearTrackInChamber(AliMUONTrack &trackCandidate, const AliMUONVClusterStore& clusterStore,
713 Int_t nextChamber)
714{
715 /// Follow trackCandidate in chamber(0..) nextChamber assuming linear propagation, and search for compatible cluster(s)
716 /// Keep all possibilities or only the best one(s) according to the flag fgkTrackAllTracks:
717 /// kTRUE: duplicate "trackCandidate" if there are several possibilities and add the new tracks at the end of
718 /// fRecTracksPtr to avoid conficts with other track candidates at this current stage of the tracking procedure.
719 /// Remove the obsolete "trackCandidate" at the end.
720 /// kFALSE: add only the best cluster(s) to the "trackCandidate". Try to add a couple of clusters in priority.
721 /// return kTRUE if new cluster(s) have been found (otherwise return kFALSE)
722 AliDebug(1,Form("Enter FollowLinearTrackInChamber(1..) %d", nextChamber+1));
723
724 Double_t chi2WithOneCluster = 1.e10;
a0dc65b4 725 Double_t maxChi2WithOneCluster = 2. * GetRecoParam()->GetSigmaCutForTracking() *
726 GetRecoParam()->GetSigmaCutForTracking(); // 2 because 2 quantities in chi2
9bf6860b 727 Double_t bestChi2WithOneCluster = maxChi2WithOneCluster;
728 Bool_t foundOneCluster = kFALSE;
729 AliMUONTrack *newTrack = 0x0;
730 AliMUONVCluster *cluster;
731 AliMUONTrackParam trackParam;
732 AliMUONTrackParam extrapTrackParamAtCluster;
733 AliMUONTrackParam bestTrackParamAtCluster;
734
735 // Get track parameters according to the propagation direction
736 if (nextChamber > 7) trackParam = *(AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->Last();
737 else trackParam = *(AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->First();
738
739 // Printout for debuging
740 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 2) || (AliLog::GetGlobalDebugLevel() >= 2)) {
741 cout<<endl<<"Track parameters and covariances at first cluster:"<<endl;
742 trackParam.GetParameters().Print();
743 trackParam.GetCovariances().Print();
744 }
745
746 // Add MCS effect
747 AliMUONTrackExtrap::AddMCSEffect(&trackParam,AliMUONConstants::ChamberThicknessInX0(),1.);
748
749 // Printout for debuging
750 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
751 cout << "FollowLinearTrackInChamber: look for cluster in chamber(1..): " << nextChamber+1 << endl;
752 }
753
754 // Create iterators to loop over clusters in chamber
755 TIter next(clusterStore.CreateChamberIterator(nextChamber,nextChamber));
756
757 // look for candidates in chamber
758 while ( ( cluster = static_cast<AliMUONVCluster*>(next()) ) ) {
759
760 // try to add the current cluster fast
761 if (!TryOneClusterFast(trackParam, cluster)) continue;
762
763 // try to add the current cluster accuratly
764 extrapTrackParamAtCluster = trackParam;
3fe6651e 765 AliMUONTrackExtrap::LinearExtrapToZCov(&extrapTrackParamAtCluster, cluster->GetZ());
9bf6860b 766 chi2WithOneCluster = TryOneCluster(extrapTrackParamAtCluster, cluster, extrapTrackParamAtCluster);
767
768 // if good chi2 then consider to add cluster
769 if (chi2WithOneCluster < maxChi2WithOneCluster) {
770 foundOneCluster = kTRUE;
771
772 // Printout for debuging
773 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
774 cout << "FollowLinearTrackInChamber: found one cluster in chamber(1..): " << nextChamber+1
775 << " (Chi2 = " << chi2WithOneCluster << ")" << endl;
776 cluster->Print();
777 }
778
a0dc65b4 779 if (GetRecoParam()->TrackAllTracks()) {
9bf6860b 780 // copy trackCandidate into a new track put at the end of fRecTracksPtr and add the new cluster
781 newTrack = new ((*fRecTracksPtr)[fRecTracksPtr->GetLast()+1]) AliMUONTrack(trackCandidate);
a0dc65b4 782 if (GetRecoParam()->RequestStation(nextChamber/2))
9bf6860b 783 extrapTrackParamAtCluster.SetRemovable(kFALSE);
784 else extrapTrackParamAtCluster.SetRemovable(kTRUE);
785 newTrack->AddTrackParamAtCluster(extrapTrackParamAtCluster,*cluster);
89c8d66d 786 newTrack->SetGlobalChi2(trackCandidate.GetGlobalChi2()+chi2WithOneCluster);
9bf6860b 787 fNRecTracks++;
788
789 // Printout for debuging
790 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
791 cout << "FollowLinearTrackInChamber: added one cluster in chamber(1..): " << nextChamber+1 << endl;
792 if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump();
793 }
794
795 } else if (chi2WithOneCluster < bestChi2WithOneCluster) {
796 // keep track of the best cluster
797 bestChi2WithOneCluster = chi2WithOneCluster;
798 bestTrackParamAtCluster = extrapTrackParamAtCluster;
799 }
800
801 }
802
803 }
804
805 // fill out the best track if required else clean up the fRecTracksPtr array
a0dc65b4 806 if (!GetRecoParam()->TrackAllTracks()) {
9bf6860b 807 if (foundOneCluster) {
a0dc65b4 808 if (GetRecoParam()->RequestStation(nextChamber/2))
9bf6860b 809 bestTrackParamAtCluster.SetRemovable(kFALSE);
810 else bestTrackParamAtCluster.SetRemovable(kTRUE);
811 trackCandidate.AddTrackParamAtCluster(bestTrackParamAtCluster,*(bestTrackParamAtCluster.GetClusterPtr()));
89c8d66d 812 trackCandidate.SetGlobalChi2(trackCandidate.GetGlobalChi2()+bestChi2WithOneCluster);
9bf6860b 813
814 // Printout for debuging
815 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
816 cout << "FollowLinearTrackInChamber: added the best cluster in chamber(1..): " << bestTrackParamAtCluster.GetClusterPtr()->GetChamberId()+1 << endl;
817 if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump();
818 }
819
820 } else return kFALSE;
821
822 } else if (foundOneCluster) {
823
824 // remove obsolete track
825 fRecTracksPtr->Remove(&trackCandidate);
826 fNRecTracks--;
827
828 } else return kFALSE;
829
830 return kTRUE;
831
832}
833
834//__________________________________________________________________________
96ebe67e 835Bool_t AliMUONVTrackReconstructor::FollowLinearTrackInStation(AliMUONTrack &trackCandidate, const AliMUONVClusterStore& clusterStore,
836 Int_t nextStation)
019df241 837{
96ebe67e 838 /// Follow trackCandidate in station(0..) nextStation assuming linear propagation, and search for compatible cluster(s)
019df241 839 /// Keep all possibilities or only the best one(s) according to the flag fgkTrackAllTracks:
840 /// kTRUE: duplicate "trackCandidate" if there are several possibilities and add the new tracks at the end of
841 /// fRecTracksPtr to avoid conficts with other track candidates at this current stage of the tracking procedure.
842 /// Remove the obsolete "trackCandidate" at the end.
96ebe67e 843 /// kFALSE: add only the best cluster(s) to the "trackCandidate". Try to add a couple of clusters in priority.
844 /// return kTRUE if new cluster(s) have been found (otherwise return kFALSE)
019df241 845 AliDebug(1,Form("Enter FollowLinearTrackInStation(1..) %d", nextStation+1));
846
847 // Order the chamber according to the propagation direction (tracking starts with chamber 2):
848 // - nextStation == station(1...) 5 => forward propagation
849 // - nextStation < station(1...) 5 => backward propagation
850 Int_t ch1, ch2;
851 if (nextStation==4) {
852 ch1 = 2*nextStation+1;
853 ch2 = 2*nextStation;
ea94c18b 854 } else {
019df241 855 ch1 = 2*nextStation;
856 ch2 = 2*nextStation+1;
ea94c18b 857 }
858
96ebe67e 859 Double_t chi2WithOneCluster = 1.e10;
860 Double_t chi2WithTwoClusters = 1.e10;
a0dc65b4 861 Double_t maxChi2WithOneCluster = 2. * GetRecoParam()->GetSigmaCutForTracking() *
862 GetRecoParam()->GetSigmaCutForTracking(); // 2 because 2 quantities in chi2
863 Double_t maxChi2WithTwoClusters = 4. * GetRecoParam()->GetSigmaCutForTracking() *
864 GetRecoParam()->GetSigmaCutForTracking(); // 4 because 4 quantities in chi2
96ebe67e 865 Double_t bestChi2WithOneCluster = maxChi2WithOneCluster;
866 Double_t bestChi2WithTwoClusters = maxChi2WithTwoClusters;
867 Bool_t foundOneCluster = kFALSE;
868 Bool_t foundTwoClusters = kFALSE;
019df241 869 AliMUONTrack *newTrack = 0x0;
96ebe67e 870 AliMUONVCluster *clusterCh1, *clusterCh2;
7332f213 871 AliMUONTrackParam trackParam;
96ebe67e 872 AliMUONTrackParam extrapTrackParamAtCluster1;
873 AliMUONTrackParam extrapTrackParamAtCluster2;
874 AliMUONTrackParam bestTrackParamAtCluster1;
875 AliMUONTrackParam bestTrackParamAtCluster2;
876
877 Int_t nClusters = clusterStore.GetSize();
878 Bool_t *clusterCh1Used = new Bool_t[nClusters];
879 for (Int_t i = 0; i < nClusters; i++) clusterCh1Used[i] = kFALSE;
880 Int_t iCluster1;
019df241 881
7332f213 882 // Get track parameters according to the propagation direction
883 if (nextStation==4) trackParam = *(AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->Last();
884 else trackParam = *(AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->First();
019df241 885
9bf6860b 886 // Printout for debuging
887 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 2) || (AliLog::GetGlobalDebugLevel() >= 2)) {
888 cout<<endl<<"Track parameters and covariances at first cluster:"<<endl;
889 trackParam.GetParameters().Print();
890 trackParam.GetCovariances().Print();
891 }
892
019df241 893 // Add MCS effect
894 AliMUONTrackExtrap::AddMCSEffect(&trackParam,AliMUONConstants::ChamberThicknessInX0(),1.);
895
896 // Printout for debuging
897 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
96ebe67e 898 cout << "FollowLinearTrackInStation: look for clusters in chamber(1..): " << ch2+1 << endl;
019df241 899 }
900
96ebe67e 901 // Create iterators to loop over clusters in both chambers
902 TIter nextInCh1(clusterStore.CreateChamberIterator(ch1,ch1));
903 TIter nextInCh2(clusterStore.CreateChamberIterator(ch2,ch2));
904
905 // look for candidates in chamber 2
906 while ( ( clusterCh2 = static_cast<AliMUONVCluster*>(nextInCh2()) ) ) {
019df241 907
96ebe67e 908 // try to add the current cluster fast
909 if (!TryOneClusterFast(trackParam, clusterCh2)) continue;
019df241 910
96ebe67e 911 // try to add the current cluster accuratly
912 extrapTrackParamAtCluster2 = trackParam;
3fe6651e 913 AliMUONTrackExtrap::LinearExtrapToZCov(&extrapTrackParamAtCluster2, clusterCh2->GetZ());
96ebe67e 914 chi2WithOneCluster = TryOneCluster(extrapTrackParamAtCluster2, clusterCh2, extrapTrackParamAtCluster2);
019df241 915
96ebe67e 916 // if good chi2 then try to attach a cluster in the other chamber too
917 if (chi2WithOneCluster < maxChi2WithOneCluster) {
918 Bool_t foundSecondCluster = kFALSE;
019df241 919
920 // Printout for debuging
921 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
96ebe67e 922 cout << "FollowLinearTrackInStation: found one cluster in chamber(1..): " << ch2+1
923 << " (Chi2 = " << chi2WithOneCluster << ")" << endl;
9bf6860b 924 clusterCh2->Print();
96ebe67e 925 cout << " look for second clusters in chamber(1..): " << ch1+1 << " ..." << endl;
019df241 926 }
927
928 // add MCS effect
96ebe67e 929 AliMUONTrackExtrap::AddMCSEffect(&extrapTrackParamAtCluster2,AliMUONConstants::ChamberThicknessInX0(),1.);
019df241 930
96ebe67e 931 // reset cluster iterator of chamber 1
932 nextInCh1.Reset();
933 iCluster1 = -1;
934
935 // look for second candidates in chamber 1
936 while ( ( clusterCh1 = static_cast<AliMUONVCluster*>(nextInCh1()) ) ) {
937 iCluster1++;
019df241 938
96ebe67e 939 // try to add the current cluster fast
940 if (!TryOneClusterFast(extrapTrackParamAtCluster2, clusterCh1)) continue;
019df241 941
96ebe67e 942 // try to add the current cluster in addition to the one found in the previous chamber
943 chi2WithTwoClusters = TryTwoClustersFast(extrapTrackParamAtCluster2, clusterCh1, extrapTrackParamAtCluster1);
019df241 944
96ebe67e 945 // if good chi2 then consider to add the 2 clusters to the "trackCandidate"
946 if (chi2WithTwoClusters < maxChi2WithTwoClusters) {
947 foundSecondCluster = kTRUE;
948 foundTwoClusters = kTRUE;
019df241 949
950 // Printout for debuging
951 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
96ebe67e 952 cout << "FollowLinearTrackInStation: found one cluster in chamber(1..): " << ch1+1
9bf6860b 953 << " (Chi2 = " << chi2WithTwoClusters << ")" << endl;
954 clusterCh1->Print();
019df241 955 }
956
a0dc65b4 957 if (GetRecoParam()->TrackAllTracks()) {
96ebe67e 958 // copy trackCandidate into a new track put at the end of fRecTracksPtr and add the new clusters
019df241 959 newTrack = new ((*fRecTracksPtr)[fRecTracksPtr->GetLast()+1]) AliMUONTrack(trackCandidate);
96ebe67e 960 extrapTrackParamAtCluster1.SetRemovable(kTRUE);
961 newTrack->AddTrackParamAtCluster(extrapTrackParamAtCluster1,*clusterCh1);
962 extrapTrackParamAtCluster2.SetRemovable(kTRUE);
963 newTrack->AddTrackParamAtCluster(extrapTrackParamAtCluster2,*clusterCh2);
89c8d66d 964 newTrack->SetGlobalChi2(newTrack->GetGlobalChi2()+chi2WithTwoClusters);
019df241 965 fNRecTracks++;
966
96ebe67e 967 // Tag clusterCh1 as used
968 clusterCh1Used[iCluster1] = kTRUE;
019df241 969
970 // Printout for debuging
971 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
96ebe67e 972 cout << "FollowLinearTrackInStation: added two clusters in station(1..): " << nextStation+1 << endl;
019df241 973 if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump();
974 }
975
96ebe67e 976 } else if (chi2WithTwoClusters < bestChi2WithTwoClusters) {
977 // keep track of the best couple of clusters
978 bestChi2WithTwoClusters = chi2WithTwoClusters;
979 bestTrackParamAtCluster1 = extrapTrackParamAtCluster1;
980 bestTrackParamAtCluster2 = extrapTrackParamAtCluster2;
019df241 981 }
982
983 }
984
985 }
986
96ebe67e 987 // if no cluster found in chamber1 then consider to add clusterCh2 only
988 if (!foundSecondCluster) {
989 foundOneCluster = kTRUE;
019df241 990
a0dc65b4 991 if (GetRecoParam()->TrackAllTracks()) {
96ebe67e 992 // copy trackCandidate into a new track put at the end of fRecTracksPtr and add the new cluster
019df241 993 newTrack = new ((*fRecTracksPtr)[fRecTracksPtr->GetLast()+1]) AliMUONTrack(trackCandidate);
a0dc65b4 994 if (GetRecoParam()->RequestStation(nextStation))
9bf6860b 995 extrapTrackParamAtCluster2.SetRemovable(kFALSE);
996 else extrapTrackParamAtCluster2.SetRemovable(kTRUE);
96ebe67e 997 newTrack->AddTrackParamAtCluster(extrapTrackParamAtCluster2,*clusterCh2);
89c8d66d 998 newTrack->SetGlobalChi2(newTrack->GetGlobalChi2()+chi2WithOneCluster);
019df241 999 fNRecTracks++;
1000
1001 // Printout for debuging
1002 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
96ebe67e 1003 cout << "FollowLinearTrackInStation: added one cluster in chamber(1..): " << ch2+1 << endl;
019df241 1004 if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump();
1005 }
1006
96ebe67e 1007 } else if (!foundTwoClusters && chi2WithOneCluster < bestChi2WithOneCluster) {
1008 // keep track of the best cluster except if a couple of clusters has already been found
1009 bestChi2WithOneCluster = chi2WithOneCluster;
1010 bestTrackParamAtCluster1 = extrapTrackParamAtCluster2;
019df241 1011 }
1012
1013 }
1014
1015 }
1016
1017 }
1018
1019 // look for candidates in chamber 1 not already attached to a track
96ebe67e 1020 // if we want to keep all possible tracks or if no good couple of clusters has been found
a0dc65b4 1021 if (GetRecoParam()->TrackAllTracks() || !foundTwoClusters) {
019df241 1022
1023 // Printout for debuging
1024 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
96ebe67e 1025 cout << "FollowLinearTrackInStation: look for single cluster in chamber(1..): " << ch1+1 << endl;
019df241 1026 }
1027
1028 //Extrapolate trackCandidate to chamber "ch2"
3fe6651e 1029 AliMUONTrackExtrap::LinearExtrapToZCov(&trackParam, AliMUONConstants::DefaultChamberZ(ch2));
019df241 1030
1031 // add MCS effect for next step
1032 AliMUONTrackExtrap::AddMCSEffect(&trackParam,AliMUONConstants::ChamberThicknessInX0(),1.);
9bf6860b 1033
96ebe67e 1034 // reset cluster iterator of chamber 1
1035 nextInCh1.Reset();
1036 iCluster1 = -1;
1037
1038 // look for second candidates in chamber 1
1039 while ( ( clusterCh1 = static_cast<AliMUONVCluster*>(nextInCh1()) ) ) {
1040 iCluster1++;
019df241 1041
96ebe67e 1042 if (clusterCh1Used[iCluster1]) continue; // Skip clusters already used
019df241 1043
96ebe67e 1044 // try to add the current cluster fast
1045 if (!TryOneClusterFast(trackParam, clusterCh1)) continue;
9bf6860b 1046
96ebe67e 1047 // try to add the current cluster accuratly
1048 extrapTrackParamAtCluster1 = trackParam;
3fe6651e 1049 AliMUONTrackExtrap::LinearExtrapToZCov(&extrapTrackParamAtCluster1, clusterCh1->GetZ());
96ebe67e 1050 chi2WithOneCluster = TryOneCluster(extrapTrackParamAtCluster1, clusterCh1, extrapTrackParamAtCluster1);
9bf6860b 1051
96ebe67e 1052 // if good chi2 then consider to add clusterCh1
1053 // We do not try to attach a cluster in the other chamber too since it has already been done above
1054 if (chi2WithOneCluster < maxChi2WithOneCluster) {
1055 foundOneCluster = kTRUE;
019df241 1056
1057 // Printout for debuging
1058 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
96ebe67e 1059 cout << "FollowLinearTrackInStation: found one cluster in chamber(1..): " << ch1+1
1060 << " (Chi2 = " << chi2WithOneCluster << ")" << endl;
9bf6860b 1061 clusterCh1->Print();
019df241 1062 }
1063
a0dc65b4 1064 if (GetRecoParam()->TrackAllTracks()) {
96ebe67e 1065 // copy trackCandidate into a new track put at the end of fRecTracksPtr and add the new cluster
019df241 1066 newTrack = new ((*fRecTracksPtr)[fRecTracksPtr->GetLast()+1]) AliMUONTrack(trackCandidate);
a0dc65b4 1067 if (GetRecoParam()->RequestStation(nextStation))
9bf6860b 1068 extrapTrackParamAtCluster1.SetRemovable(kFALSE);
1069 else extrapTrackParamAtCluster1.SetRemovable(kTRUE);
96ebe67e 1070 newTrack->AddTrackParamAtCluster(extrapTrackParamAtCluster1,*clusterCh1);
89c8d66d 1071 newTrack->SetGlobalChi2(newTrack->GetGlobalChi2()+chi2WithOneCluster);
019df241 1072 fNRecTracks++;
1073
1074 // Printout for debuging
1075 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
96ebe67e 1076 cout << "FollowLinearTrackInStation: added one cluster in chamber(1..): " << ch1+1 << endl;
019df241 1077 if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump();
1078 }
1079
96ebe67e 1080 } else if (chi2WithOneCluster < bestChi2WithOneCluster) {
1081 // keep track of the best cluster except if a couple of clusters has already been found
1082 bestChi2WithOneCluster = chi2WithOneCluster;
1083 bestTrackParamAtCluster1 = extrapTrackParamAtCluster1;
019df241 1084 }
1085
1086 }
1087
1088 }
1089
1090 }
1091
1092 // fill out the best track if required else clean up the fRecTracksPtr array
a0dc65b4 1093 if (!GetRecoParam()->TrackAllTracks()) {
96ebe67e 1094 if (foundTwoClusters) {
1095 bestTrackParamAtCluster1.SetRemovable(kTRUE);
1096 trackCandidate.AddTrackParamAtCluster(bestTrackParamAtCluster1,*(bestTrackParamAtCluster1.GetClusterPtr()));
1097 bestTrackParamAtCluster2.SetRemovable(kTRUE);
1098 trackCandidate.AddTrackParamAtCluster(bestTrackParamAtCluster2,*(bestTrackParamAtCluster2.GetClusterPtr()));
89c8d66d 1099 trackCandidate.SetGlobalChi2(trackCandidate.GetGlobalChi2()+bestChi2WithTwoClusters);
019df241 1100
1101 // Printout for debuging
1102 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
96ebe67e 1103 cout << "FollowLinearTrackInStation: added the two best clusters in station(1..): " << nextStation+1 << endl;
019df241 1104 if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump();
1105 }
1106
96ebe67e 1107 } else if (foundOneCluster) {
a0dc65b4 1108 if (GetRecoParam()->RequestStation(nextStation))
9bf6860b 1109 bestTrackParamAtCluster1.SetRemovable(kFALSE);
1110 else bestTrackParamAtCluster1.SetRemovable(kTRUE);
96ebe67e 1111 trackCandidate.AddTrackParamAtCluster(bestTrackParamAtCluster1,*(bestTrackParamAtCluster1.GetClusterPtr()));
89c8d66d 1112 trackCandidate.SetGlobalChi2(trackCandidate.GetGlobalChi2()+bestChi2WithOneCluster);
019df241 1113
1114 // Printout for debuging
1115 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
96ebe67e 1116 cout << "FollowLinearTrackInStation: added the best cluster in chamber(1..): " << bestTrackParamAtCluster1.GetClusterPtr()->GetChamberId()+1 << endl;
019df241 1117 if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump();
1118 }
1119
dd230855 1120 } else {
96ebe67e 1121 delete [] clusterCh1Used;
dd230855 1122 return kFALSE;
1123 }
019df241 1124
96ebe67e 1125 } else if (foundOneCluster || foundTwoClusters) {
019df241 1126
1127 // remove obsolete track
1128 fRecTracksPtr->Remove(&trackCandidate);
1129 fNRecTracks--;
1130
dd230855 1131 } else {
96ebe67e 1132 delete [] clusterCh1Used;
dd230855 1133 return kFALSE;
1134 }
ea94c18b 1135
96ebe67e 1136 delete [] clusterCh1Used;
019df241 1137 return kTRUE;
ea94c18b 1138
1139}
1140
7332f213 1141//__________________________________________________________________________
1142void AliMUONVTrackReconstructor::ImproveTracks()
1143{
1144 /// Improve tracks by removing clusters with local chi2 highter than the defined cut
1145 /// Recompute track parameters and covariances at the remaining clusters
1146 AliDebug(1,"Enter ImproveTracks");
1147
1148 AliMUONTrack *track, *nextTrack;
1149
7332f213 1150 track = (AliMUONTrack*) fRecTracksPtr->First();
1151 while (track) {
1152
1153 // prepare next track in case the actual track is suppressed
1154 nextTrack = (AliMUONTrack*) fRecTracksPtr->After(track);
1155
1156 ImproveTrack(*track);
1157
1158 // remove track if improvement failed
1159 if (!track->IsImproved()) {
1160 fRecTracksPtr->Remove(track);
1161 fNRecTracks--;
1162 }
1163
1164 track = nextTrack;
1165 }
1166
1167 // compress the array in case of some tracks have been removed
1168 fRecTracksPtr->Compress();
1169
1170}
1171
1172//__________________________________________________________________________
1173void AliMUONVTrackReconstructor::Finalize()
1174{
1175 /// Recompute track parameters and covariances at each attached cluster from those at the first one
2e2d0c44 1176 /// Set the label pointing to the corresponding MC track
7332f213 1177
1178 AliMUONTrack *track;
1179
1180 track = (AliMUONTrack*) fRecTracksPtr->First();
1181 while (track) {
1182
1183 FinalizeTrack(*track);
1184
2e2d0c44 1185 track->FindMCLabel();
1186
7332f213 1187 track = (AliMUONTrack*) fRecTracksPtr->After(track);
1188
1189 }
1190
1191}
1192
1193//__________________________________________________________________________
7ec3b9cf 1194void AliMUONVTrackReconstructor::ValidateTracksWithTrigger(AliMUONVTrackStore& trackStore,
1195 const AliMUONVTriggerTrackStore& triggerTrackStore,
1196 const AliMUONVTriggerStore& triggerStore,
1197 const AliMUONTrackHitPattern& trackHitPattern)
8d0843c6 1198{
1199 /// Try to match track from tracking system with trigger track
b709ac13 1200 AliCodeTimerAuto("");
fda59e58 1201
683cb6c5 1202 trackHitPattern.ExecuteValidation(trackStore, triggerTrackStore, triggerStore);
8d0843c6 1203}
1204
ea94c18b 1205 //__________________________________________________________________________
1206void AliMUONVTrackReconstructor::EventReconstructTrigger(const AliMUONTriggerCircuit& circuit,
1207 const AliMUONVTriggerStore& triggerStore,
1208 AliMUONVTriggerTrackStore& triggerTrackStore)
8d0843c6 1209{
71a2d3aa 1210 /// To make the trigger tracks from Local Trigger
7ec3b9cf 1211 AliDebug(1, "");
b709ac13 1212 AliCodeTimerAuto("");
7ec3b9cf 1213
1214 AliMUONGlobalTrigger* globalTrigger = triggerStore.Global();
e6b25a6e 1215
7ec3b9cf 1216 UChar_t gloTrigPat = 0;
e6b25a6e 1217
7ec3b9cf 1218 if (globalTrigger)
1219 {
1220 gloTrigPat = globalTrigger->GetGlobalResponse();
e6b25a6e 1221 }
1222
7ec3b9cf 1223 TIter next(triggerStore.CreateIterator());
1224 AliMUONLocalTrigger* locTrg(0x0);
8d0843c6 1225
e6b25a6e 1226 Float_t z11 = AliMUONConstants::DefaultChamberZ(10);
1227 Float_t z21 = AliMUONConstants::DefaultChamberZ(12);
7cf63da6 1228
7ec3b9cf 1229 AliMUONTriggerTrack triggerTrack;
1230
1231 while ( ( locTrg = static_cast<AliMUONLocalTrigger*>(next()) ) )
1232 {
d72d7b9e 1233 Bool_t xTrig=locTrg->IsTrigX();
1234 Bool_t yTrig=locTrg->IsTrigY();
7ec3b9cf 1235
32ab62c9 1236 Int_t localBoardId = locTrg->LoCircuit();
7ec3b9cf 1237
1238 if (xTrig && yTrig)
1239 { // make Trigger Track if trigger in X and Y
8b0baca4 1240
32ab62c9 1241 Float_t y11 = circuit.GetY11Pos(localBoardId, locTrg->LoStripX());
7ec3b9cf 1242 // need first to convert deviation to [0-30]
1243 // (see AliMUONLocalTriggerBoard::LocalTrigger)
d72d7b9e 1244 Int_t deviation = locTrg->GetDeviation();
7ec3b9cf 1245 Int_t stripX21 = locTrg->LoStripX()+deviation+1;
32ab62c9 1246 Float_t y21 = circuit.GetY21Pos(localBoardId, stripX21);
1247 Float_t x11 = circuit.GetX11Pos(localBoardId, locTrg->LoStripY());
7ec3b9cf 1248
1249 AliDebug(1, Form(" MakeTriggerTrack %d %d %d %d %f %f %f \n",locTrg->LoCircuit(),
1250 locTrg->LoStripX(),locTrg->LoStripX()+locTrg->LoDev()+1,locTrg->LoStripY(),y11, y21, x11));
1251
1252 Float_t thetax = TMath::ATan2( x11 , z11 );
1253 Float_t thetay = TMath::ATan2( (y21-y11) , (z21-z11) );
abc2458f 1254
1255 CorrectThetaRange(thetax);
1256 CorrectThetaRange(thetay);
7ec3b9cf 1257
1258 triggerTrack.SetX11(x11);
1259 triggerTrack.SetY11(y11);
1260 triggerTrack.SetThetax(thetax);
1261 triggerTrack.SetThetay(thetay);
1262 triggerTrack.SetGTPattern(gloTrigPat);
32ab62c9 1263 triggerTrack.SetLoTrgNum(localBoardId);
7ec3b9cf 1264
1265 triggerTrackStore.Add(triggerTrack);
1266 } // board is fired
e6b25a6e 1267 } // end of loop on Local Trigger
8d0843c6 1268}
ea94c18b 1269
abc2458f 1270//__________________________________________________________________________
1271void AliMUONVTrackReconstructor::CorrectThetaRange(Float_t& theta)
1272{
1273 /// The angles of the trigger tracks, obtained with ATan2,
1274 /// have values around +pi and -pi. On the contrary, the angles
1275 /// used in the tracker tracks have values around 0.
1276 /// This function sets the same range for the trigger tracks angles.
1277 if (theta < -TMath::PiOver2()) theta += TMath::Pi();
1278 else if(theta > TMath::PiOver2()) theta -= TMath::Pi();
1279}