1 /**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
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 **************************************************************************/
18 //-----------------------------------------------------------------------------
19 /// \class AliMUONVTrackReconstructor
20 /// Virtual MUON track reconstructor in ALICE (class renamed from AliMUONEventReconstructor)
22 /// This class contains as data a pointer to the array of reconstructed tracks
24 /// It contains as methods, among others:
25 /// * EventReconstruct to build the muon tracks
26 /// * EventReconstructTrigger to build the trigger tracks
27 /// * ValidateTracksWithTrigger to match tracker/trigger tracks
29 /// Several options and adjustable parameters are available for both KALMAN and ORIGINAL
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)
34 /// Main parameters and options are:
35 /// - *fgkSigmaToCutForTracking* : quality cut used to select new clusters to be
36 /// attached to the track candidate and to select good tracks.
37 /// - *fgkMakeTrackCandidatesFast* : if this flag is set to 'true', the track candidates
38 /// are made assuming linear propagation between stations 4 and 5.
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
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
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).
52 /// - *fgkSigmaToCutForImprovement* : quality cut used when we try to improve the
53 /// quality of the tracks.
55 /// \author Philippe Pillot
56 //-----------------------------------------------------------------------------
58 #include "AliMUONVTrackReconstructor.h"
60 #include "AliMUONConstants.h"
61 #include "AliMUONObjectPair.h"
62 #include "AliMUONTriggerTrack.h"
63 #include "AliMUONTriggerCircuit.h"
64 #include "AliMUONLocalTrigger.h"
65 #include "AliMUONGlobalTrigger.h"
66 #include "AliMUONTrack.h"
67 #include "AliMUONTrackParam.h"
68 #include "AliMUONTrackExtrap.h"
69 #include "AliMUONTrackHitPattern.h"
70 #include "AliMUONVTrackStore.h"
71 #include "AliMUONVClusterStore.h"
72 #include "AliMUONVCluster.h"
73 #include "AliMUONVClusterServer.h"
74 #include "AliMUONVTriggerStore.h"
75 #include "AliMUONVTriggerTrackStore.h"
76 #include "AliMUONRecoParam.h"
78 #include "AliMpDEManager.h"
79 #include "AliMpArea.h"
82 #include "AliCodeTimer.h"
83 #include "AliTracker.h"
85 #include <TClonesArray.h>
90 #include <Riostream.h>
93 ClassImp(AliMUONVTrackReconstructor) // Class implementation in ROOT context
96 //__________________________________________________________________________
97 AliMUONVTrackReconstructor::AliMUONVTrackReconstructor(const AliMUONRecoParam* recoParam,
98 AliMUONVClusterServer* clusterServer)
102 fClusterServer(clusterServer),
103 fkRecoParam(recoParam),
106 /// Constructor for class AliMUONVTrackReconstructor
107 /// WARNING: if clusterServer=0x0, no clusterization will be possible at this level
109 // Memory allocation for the TClonesArray of reconstructed tracks
110 fRecTracksPtr = new TClonesArray("AliMUONTrack", 100);
112 // set the magnetic field for track extrapolations
113 AliMUONTrackExtrap::SetField();
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 = new Double_t [AliMUONConstants::NTrackingCh()];
120 for (Int_t iCh=0; iCh<AliMUONConstants::NTrackingCh(); iCh++)
121 fMaxMCSAngle2[iCh] = AliMUONTrackExtrap::GetMCSAngle2(param, AliMUONConstants::ChamberThicknessInX0(iCh), 1.);
125 //__________________________________________________________________________
126 AliMUONVTrackReconstructor::~AliMUONVTrackReconstructor()
128 /// Destructor for class AliMUONVTrackReconstructor
129 delete fRecTracksPtr;
130 delete[] fMaxMCSAngle2;
133 //__________________________________________________________________________
134 void AliMUONVTrackReconstructor::ResetTracks()
136 /// To reset the TClonesArray of reconstructed tracks
137 if (fRecTracksPtr) fRecTracksPtr->Clear("C");
142 //__________________________________________________________________________
143 void AliMUONVTrackReconstructor::EventReconstruct(AliMUONVClusterStore& clusterStore, AliMUONVTrackStore& trackStore)
145 /// To reconstruct one event
147 AliCodeTimerAuto("",0);
149 // Reset array of tracks
152 // Look for candidates from clusters in stations(1..) 4 and 5 (abort in case of failure)
153 if (!MakeTrackCandidates(clusterStore)) return;
155 // Look for extra candidates from clusters in stations(1..) 4 and 5 (abort in case of failure)
156 if (GetRecoParam()->MakeMoreTrackCandidates()) {
157 if (!MakeMoreTrackCandidates(clusterStore)) return;
160 // Stop tracking if no candidate found
161 if (fRecTracksPtr->GetEntriesFast() == 0) return;
163 // Follow tracks in stations(1..) 3, 2 and 1 (abort in case of failure)
164 if (!FollowTracks(clusterStore)) return;
166 // Complement the reconstructed tracks
167 if (GetRecoParam()->ComplementTracks()) {
168 if (ComplementTracks(clusterStore)) RemoveIdenticalTracks();
171 // Improve the reconstructed tracks
172 if (GetRecoParam()->ImproveTracks()) ImproveTracks();
174 // Remove connected tracks
175 if (GetRecoParam()->RemoveConnectedTracksInSt12()) RemoveConnectedTracks(kFALSE);
176 else RemoveConnectedTracks(kTRUE);
178 // Fill AliMUONTrack data members
181 // Add tracks to MUON data container
182 for (Int_t i=0; i<fNRecTracks; ++i)
184 AliMUONTrack * track = (AliMUONTrack*) fRecTracksPtr->At(i);
185 if (track->GetGlobalChi2() < AliMUONTrack::MaxChi2()) {
186 track->SetUniqueID(i+1);
187 trackStore.Add(*track);
188 } else AliWarning("problem occur somewhere during track refitting --> discard track");
192 //__________________________________________________________________________
193 Bool_t AliMUONVTrackReconstructor::IsAcceptable(AliMUONTrackParam &trackParam)
195 /// Return kTRUE if the track is within given limits on momentum/angle/origin
197 const TMatrixD& kParamCov = trackParam.GetCovariances();
198 Int_t chamber = trackParam.GetClusterPtr()->GetChamberId();
199 Double_t z = trackParam.GetZ();
200 Double_t sigmaCut = GetRecoParam()->GetSigmaCutForTracking();
203 Double_t angleMCS2 = 0.;
204 Double_t impactMCS2 = 0.;
205 if (AliMUONTrackExtrap::IsFieldON() && chamber < 6) {
207 // track momentum is known
208 for (Int_t iCh=0; iCh<=chamber; iCh++) {
209 Double_t localMCS2 = AliMUONTrackExtrap::GetMCSAngle2(trackParam, AliMUONConstants::ChamberThicknessInX0(iCh), 1.);
210 angleMCS2 += localMCS2;
211 impactMCS2 += AliMUONConstants::DefaultChamberZ(chamber) * AliMUONConstants::DefaultChamberZ(chamber) * localMCS2;
216 // track momentum is unknown
217 for (Int_t iCh=0; iCh<=chamber; iCh++) {
218 angleMCS2 += fMaxMCSAngle2[iCh];
219 impactMCS2 += AliMUONConstants::DefaultChamberZ(chamber) * AliMUONConstants::DefaultChamberZ(chamber) * fMaxMCSAngle2[iCh];
224 // ------ track selection in non bending direction ------
225 if (GetRecoParam()->SelectOnTrackSlope()) {
227 // check if non bending slope is within tolerances
228 Double_t nonBendingSlopeErr = TMath::Sqrt(kParamCov(1,1) + angleMCS2);
229 if ((TMath::Abs(trackParam.GetNonBendingSlope()) - sigmaCut * nonBendingSlopeErr) > GetRecoParam()->GetMaxNonBendingSlope()) return kFALSE;
233 // or check if non bending impact parameter is within tolerances
234 Double_t nonBendingImpactParam = TMath::Abs(trackParam.GetNonBendingCoor() - z * trackParam.GetNonBendingSlope());
235 Double_t nonBendingImpactParamErr = TMath::Sqrt(kParamCov(0,0) + z * z * kParamCov(1,1) - 2. * z * kParamCov(0,1) + impactMCS2);
236 if ((nonBendingImpactParam - sigmaCut * nonBendingImpactParamErr) > (3. * GetRecoParam()->GetNonBendingVertexDispersion())) return kFALSE;
240 // ------ track selection in bending direction ------
241 if (AliMUONTrackExtrap::IsFieldON()) { // depending whether the field is ON or OFF
243 // check if bending momentum is within tolerances
244 Double_t bendingMomentum = TMath::Abs(1. / trackParam.GetInverseBendingMomentum());
245 Double_t bendingMomentumErr = TMath::Sqrt(kParamCov(4,4)) * bendingMomentum * bendingMomentum;
246 if (chamber < 6 && (bendingMomentum + sigmaCut * bendingMomentumErr) < GetRecoParam()->GetMinBendingMomentum()) return kFALSE;
247 else if ((bendingMomentum + 3. * bendingMomentumErr) < GetRecoParam()->GetMinBendingMomentum()) return kFALSE;
251 if (GetRecoParam()->SelectOnTrackSlope()) {
253 // check if bending slope is within tolerances
254 Double_t bendingSlopeErr = TMath::Sqrt(kParamCov(3,3) + angleMCS2);
255 if ((TMath::Abs(trackParam.GetBendingSlope()) - sigmaCut * bendingSlopeErr) > GetRecoParam()->GetMaxBendingSlope()) return kFALSE;
259 // or check if bending impact parameter is within tolerances
260 Double_t bendingImpactParam = TMath::Abs(trackParam.GetBendingCoor() - z * trackParam.GetBendingSlope());
261 Double_t bendingImpactParamErr = TMath::Sqrt(kParamCov(2,2) + z * z * kParamCov(3,3) - 2. * z * kParamCov(2,3) + impactMCS2);
262 if ((bendingImpactParam - sigmaCut * bendingImpactParamErr) > (3. * GetRecoParam()->GetBendingVertexDispersion())) return kFALSE;
272 //__________________________________________________________________________
273 TClonesArray* AliMUONVTrackReconstructor::MakeSegmentsBetweenChambers(const AliMUONVClusterStore& clusterStore, Int_t ch1, Int_t ch2)
275 /// To make the list of segments from the list of clusters in the 2 given chambers.
276 /// Return a new TClonesArray of segments.
277 /// It is the responsibility of the user to delete it afterward.
278 AliDebug(1,Form("Enter MakeSegmentsBetweenChambers (1..) %d-%d", ch1+1, ch2+1));
279 AliCodeTimerAuto("",0);
281 AliMUONVCluster *cluster1, *cluster2;
282 AliMUONObjectPair *segment;
283 Double_t z1 = 0., z2 = 0., dZ = 0.;
284 Double_t nonBendingSlope = 0., nonBendingSlopeErr = 0., nonBendingImpactParam = 0., nonBendingImpactParamErr = 0.;
285 Double_t bendingSlope = 0., bendingSlopeErr = 0., bendingImpactParam = 0., bendingImpactParamErr = 0., bendingImpactParamErr2 = 0.;
286 Double_t bendingMomentum = 0., bendingMomentumErr = 0.;
287 Double_t bendingVertexDispersion2 = GetRecoParam()->GetBendingVertexDispersion() * GetRecoParam()->GetBendingVertexDispersion();
288 Double_t angleMCS2 = 0.; // maximum angular dispersion**2 due to MCS in chamber
289 Double_t impactMCS2 = 0.; // maximum impact parameter dispersion**2 due to MCS in chamber
290 for (Int_t iCh=0; iCh<=ch1; iCh++) {
291 angleMCS2 += fMaxMCSAngle2[iCh];
292 impactMCS2 += AliMUONConstants::DefaultChamberZ(iCh) * AliMUONConstants::DefaultChamberZ(iCh) * fMaxMCSAngle2[iCh];
294 Double_t sigmaCut = GetRecoParam()->GetSigmaCutForTracking();
296 // Create iterators to loop over clusters in both chambers
297 TIter nextInCh1(clusterStore.CreateChamberIterator(ch1,ch1));
298 TIter nextInCh2(clusterStore.CreateChamberIterator(ch2,ch2));
301 TClonesArray *segments = new TClonesArray("AliMUONObjectPair", 100);
303 // Loop over clusters in the first chamber of the station
304 while ( ( cluster1 = static_cast<AliMUONVCluster*>(nextInCh1()) ) ) {
305 z1 = cluster1->GetZ();
307 // reset cluster iterator of chamber 2
310 // Loop over clusters in the second chamber of the station
311 while ( ( cluster2 = static_cast<AliMUONVCluster*>(nextInCh2()) ) ) {
312 z2 = cluster2->GetZ();
315 // ------ track selection in non bending direction ------
316 nonBendingSlope = (cluster1->GetX() - cluster2->GetX()) / dZ;
317 if (GetRecoParam()->SelectOnTrackSlope()) {
319 // check if non bending slope is within tolerances
320 nonBendingSlopeErr = TMath::Sqrt((cluster1->GetErrX2() + cluster2->GetErrX2()) / dZ / dZ + angleMCS2);
321 if ((TMath::Abs(nonBendingSlope) - sigmaCut * nonBendingSlopeErr) > GetRecoParam()->GetMaxNonBendingSlope()) continue;
325 // or check if non bending impact parameter is within tolerances
326 nonBendingImpactParam = TMath::Abs(cluster1->GetX() - cluster1->GetZ() * nonBendingSlope);
327 nonBendingImpactParamErr = TMath::Sqrt((z1 * z1 * cluster2->GetErrX2() + z2 * z2 * cluster1->GetErrX2()) / dZ / dZ + impactMCS2);
328 if ((nonBendingImpactParam - sigmaCut * nonBendingImpactParamErr) > (3. * GetRecoParam()->GetNonBendingVertexDispersion())) continue;
332 // ------ track selection in bending direction ------
333 bendingSlope = (cluster1->GetY() - cluster2->GetY()) / dZ;
334 if (AliMUONTrackExtrap::IsFieldON()) { // depending whether the field is ON or OFF
336 // check if bending momentum is within tolerances
337 bendingImpactParam = cluster1->GetY() - cluster1->GetZ() * bendingSlope;
338 bendingImpactParamErr2 = (z1 * z1 * cluster2->GetErrY2() + z2 * z2 * cluster1->GetErrY2()) / dZ / dZ + impactMCS2;
339 bendingMomentum = TMath::Abs(AliMUONTrackExtrap::GetBendingMomentumFromImpactParam(bendingImpactParam));
340 bendingMomentumErr = TMath::Sqrt((bendingVertexDispersion2 + bendingImpactParamErr2) /
341 bendingImpactParam / bendingImpactParam + 0.01) * bendingMomentum;
342 if ((bendingMomentum + 3. * bendingMomentumErr) < GetRecoParam()->GetMinBendingMomentum()) continue;
346 if (GetRecoParam()->SelectOnTrackSlope()) {
348 // check if bending slope is within tolerances
349 bendingSlopeErr = TMath::Sqrt((cluster1->GetErrY2() + cluster2->GetErrY2()) / dZ / dZ + angleMCS2);
350 if ((TMath::Abs(bendingSlope) - sigmaCut * bendingSlopeErr) > GetRecoParam()->GetMaxBendingSlope()) continue;
354 // or check if bending impact parameter is within tolerances
355 bendingImpactParam = TMath::Abs(cluster1->GetY() - cluster1->GetZ() * bendingSlope);
356 bendingImpactParamErr = TMath::Sqrt((z1 * z1 * cluster2->GetErrY2() + z2 * z2 * cluster1->GetErrY2()) / dZ / dZ + impactMCS2);
357 if ((bendingImpactParam - sigmaCut * bendingImpactParamErr) > (3. * GetRecoParam()->GetBendingVertexDispersion())) continue;
364 segment = new ((*segments)[segments->GetLast()+1]) AliMUONObjectPair(cluster1, cluster2, kFALSE, kFALSE);
366 // Printout for debug
367 if (AliLog::GetGlobalDebugLevel() > 1) {
368 cout << "segmentIndex(0...): " << segments->GetLast() << endl;
370 cout << "Cluster in first chamber" << endl;
372 cout << "Cluster in second chamber" << endl;
380 // Printout for debug
381 AliDebug(1,Form("chambers%d-%d: NSegments = %d ", ch1+1, ch2+1, segments->GetEntriesFast()));
386 //__________________________________________________________________________
387 void AliMUONVTrackReconstructor::RemoveUsedSegments(TClonesArray& segments)
389 /// To remove pairs of clusters already attached to a track
390 AliDebug(1,"Enter RemoveUsedSegments");
391 Int_t nSegments = segments.GetEntriesFast();
392 Int_t nTracks = fRecTracksPtr->GetEntriesFast();
393 AliMUONObjectPair *segment;
395 AliMUONVCluster *cluster, *cluster1, *cluster2;
396 Bool_t foundCluster1, foundCluster2, removeSegment;
398 // Loop over segments
399 for (Int_t iSegment=0; iSegment<nSegments; iSegment++) {
400 segment = (AliMUONObjectPair*) segments.UncheckedAt(iSegment);
402 cluster1 = (AliMUONVCluster*) segment->First();
403 cluster2 = (AliMUONVCluster*) segment->Second();
404 removeSegment = kFALSE;
407 for (Int_t iTrack = 0; iTrack < nTracks; iTrack++) {
408 track = (AliMUONTrack*) fRecTracksPtr->UncheckedAt(iTrack);
411 if (!track) continue;
413 foundCluster1 = kFALSE;
414 foundCluster2 = kFALSE;
416 // Loop over clusters
417 Int_t nClusters = track->GetNClusters();
418 for (Int_t iCluster = 0; iCluster < nClusters; iCluster++) {
419 cluster = ((AliMUONTrackParam*) track->GetTrackParamAtCluster()->UncheckedAt(iCluster))->GetClusterPtr();
421 // check if both clusters are in that track
422 if (cluster == cluster1) foundCluster1 = kTRUE;
423 else if (cluster == cluster2) foundCluster2 = kTRUE;
425 if (foundCluster1 && foundCluster2) {
426 removeSegment = kTRUE;
432 if (removeSegment) break;
436 if (removeSegment) segments.RemoveAt(iSegment);
442 // Printout for debug
443 AliDebug(1,Form("NSegments = %d ", segments.GetEntriesFast()));
446 //__________________________________________________________________________
447 void AliMUONVTrackReconstructor::RemoveIdenticalTracks()
449 /// To remove identical tracks:
450 /// Tracks are considered identical if they have all their clusters in common.
451 /// One keeps the track with the larger number of clusters if need be
452 AliMUONTrack *track1, *track2;
453 Int_t nTracks = fRecTracksPtr->GetEntriesFast();
454 Int_t clustersInCommon, nClusters1, nClusters2;
455 // Loop over first track of the pair
456 for (Int_t iTrack1 = 0; iTrack1 < nTracks; iTrack1++) {
457 track1 = (AliMUONTrack*) fRecTracksPtr->UncheckedAt(iTrack1);
459 if (!track1) continue;
460 nClusters1 = track1->GetNClusters();
461 // Loop over second track of the pair
462 for (Int_t iTrack2 = iTrack1+1; iTrack2 < nTracks; iTrack2++) {
463 track2 = (AliMUONTrack*) fRecTracksPtr->UncheckedAt(iTrack2);
465 if (!track2) continue;
466 nClusters2 = track2->GetNClusters();
467 // number of clusters in common between two tracks
468 clustersInCommon = track1->ClustersInCommon(track2);
469 // check for identical tracks
470 if ((clustersInCommon == nClusters1) || (clustersInCommon == nClusters2)) {
471 // decide which track to remove
472 if (nClusters2 > nClusters1) {
473 // remove track1 and continue the first loop with the track next to track1
474 fRecTracksPtr->RemoveAt(iTrack1);
478 // remove track2 and continue the second loop with the track next to track2
479 fRecTracksPtr->RemoveAt(iTrack2);
485 fRecTracksPtr->Compress(); // this is essential to retrieve the TClonesArray afterwards
488 //__________________________________________________________________________
489 void AliMUONVTrackReconstructor::RemoveDoubleTracks()
491 /// To remove double tracks:
492 /// Tracks are considered identical if more than half of the clusters of the track
493 /// which has the smaller number of clusters are in common with the other track.
494 /// Among two identical tracks, one keeps the track with the larger number of clusters
495 /// or, if these numbers are equal, the track with the minimum chi2.
496 AliMUONTrack *track1, *track2;
497 Int_t nTracks = fRecTracksPtr->GetEntriesFast();
498 Int_t clustersInCommon2, nClusters1, nClusters2;
499 // Loop over first track of the pair
500 for (Int_t iTrack1 = 0; iTrack1 < nTracks; iTrack1++) {
501 track1 = (AliMUONTrack*) fRecTracksPtr->UncheckedAt(iTrack1);
503 if (!track1) continue;
504 nClusters1 = track1->GetNClusters();
505 // Loop over second track of the pair
506 for (Int_t iTrack2 = iTrack1+1; iTrack2 < nTracks; iTrack2++) {
507 track2 = (AliMUONTrack*) fRecTracksPtr->UncheckedAt(iTrack2);
509 if (!track2) continue;
510 nClusters2 = track2->GetNClusters();
511 // number of clusters in common between two tracks
512 clustersInCommon2 = 2 * track1->ClustersInCommon(track2);
513 // check for identical tracks
514 if (clustersInCommon2 > nClusters1 || clustersInCommon2 > nClusters2) {
515 // decide which track to remove
516 if ((nClusters1 > nClusters2) || ((nClusters1 == nClusters2) && (track1->GetGlobalChi2() <= track2->GetGlobalChi2()))) {
517 // remove track2 and continue the second loop with the track next to track2
518 fRecTracksPtr->RemoveAt(iTrack2);
521 // else remove track1 and continue the first loop with the track next to track1
522 fRecTracksPtr->RemoveAt(iTrack1);
529 fRecTracksPtr->Compress(); // this is essential to retrieve the TClonesArray afterwards
532 //__________________________________________________________________________
533 void AliMUONVTrackReconstructor::RemoveConnectedTracks(Bool_t inSt345)
535 /// To remove double tracks:
536 /// Tracks are considered identical if they share 1 cluster or more.
537 /// If inSt345=kTRUE only stations 3, 4 and 5 are considered.
538 /// Among two identical tracks, one keeps the track with the larger number of clusters
539 /// or, if these numbers are equal, the track with the minimum chi2.
540 AliMUONTrack *track1, *track2, *trackToRemove;
541 Int_t clustersInCommon, nClusters1, nClusters2;
542 Bool_t removedTrack1;
543 // Loop over first track of the pair
544 track1 = (AliMUONTrack*) fRecTracksPtr->First();
546 removedTrack1 = kFALSE;
547 nClusters1 = track1->GetNClusters();
548 // Loop over second track of the pair
549 track2 = (AliMUONTrack*) fRecTracksPtr->After(track1);
551 nClusters2 = track2->GetNClusters();
552 // number of clusters in common between two tracks
553 if (inSt345) clustersInCommon = track1->ClustersInCommonInSt345(track2);
554 else clustersInCommon = track1->ClustersInCommon(track2);
555 // check for identical tracks
556 if (clustersInCommon > 0) {
557 // decide which track to remove
558 if ((nClusters1 > nClusters2) || ((nClusters1 == nClusters2) && (track1->GetGlobalChi2() <= track2->GetGlobalChi2()))) {
559 // remove track2 and continue the second loop with the track next to track2
560 trackToRemove = track2;
561 track2 = (AliMUONTrack*) fRecTracksPtr->After(track2);
562 fRecTracksPtr->Remove(trackToRemove);
563 fRecTracksPtr->Compress(); // this is essential to retrieve the TClonesArray afterwards
566 // else remove track1 and continue the first loop with the track next to track1
567 trackToRemove = track1;
568 track1 = (AliMUONTrack*) fRecTracksPtr->After(track1);
569 fRecTracksPtr->Remove(trackToRemove);
570 fRecTracksPtr->Compress(); // this is essential to retrieve the TClonesArray afterwards
572 removedTrack1 = kTRUE;
575 } else track2 = (AliMUONTrack*) fRecTracksPtr->After(track2);
577 if (removedTrack1) continue;
578 track1 = (AliMUONTrack*) fRecTracksPtr->After(track1);
583 //__________________________________________________________________________
584 void AliMUONVTrackReconstructor::AskForNewClustersInChamber(const AliMUONTrackParam &trackParam,
585 AliMUONVClusterStore& clusterStore, Int_t chamber)
587 /// Ask the clustering to reconstruct new clusters around the track candidate position
589 // check if the current chamber is useable
590 if (!fClusterServer || !GetRecoParam()->UseChamber(chamber)) return;
592 // maximum distance between the center of the chamber and a detection element
593 // (accounting for the inclination of the chamber)
594 static const Double_t kMaxDZ = 15.; // 15 cm
596 // extrapolate track parameters to the chamber
597 AliMUONTrackParam extrapTrackParam(trackParam);
598 if (!AliMUONTrackExtrap::ExtrapToZCov(&extrapTrackParam, AliMUONConstants::DefaultChamberZ(chamber))) return;
600 // build the searching area using the track and chamber resolutions and the maximum-distance-to-track value
601 const TMatrixD& kParamCov = extrapTrackParam.GetCovariances();
602 Double_t errX2 = kParamCov(0,0) + kMaxDZ * kMaxDZ * kParamCov(1,1) + 2. * kMaxDZ * TMath::Abs(kParamCov(0,1)) +
603 GetRecoParam()->GetDefaultNonBendingReso(chamber) * GetRecoParam()->GetDefaultNonBendingReso(chamber);
604 Double_t errY2 = kParamCov(2,2) + kMaxDZ * kMaxDZ * kParamCov(3,3) + 2. * kMaxDZ * TMath::Abs(kParamCov(2,3)) +
605 GetRecoParam()->GetDefaultBendingReso(chamber) * GetRecoParam()->GetDefaultBendingReso(chamber);
606 Double_t dX = TMath::Abs(trackParam.GetNonBendingSlope()) * kMaxDZ +
607 GetRecoParam()->GetMaxNonBendingDistanceToTrack() +
608 GetRecoParam()->GetSigmaCutForTracking() * TMath::Sqrt(2. * errX2);
609 Double_t dY = TMath::Abs(trackParam.GetBendingSlope()) * kMaxDZ +
610 GetRecoParam()->GetMaxBendingDistanceToTrack() +
611 GetRecoParam()->GetSigmaCutForTracking() * TMath::Sqrt(2. * errY2);
612 AliMpArea area(extrapTrackParam.GetNonBendingCoor(),
613 extrapTrackParam.GetBendingCoor(),
616 // ask to cluterize in the given area of the given chamber
617 fClusterServer->Clusterize(chamber, clusterStore, area, GetRecoParam());
621 //__________________________________________________________________________
622 void AliMUONVTrackReconstructor::AskForNewClustersInStation(const AliMUONTrackParam &trackParam,
623 AliMUONVClusterStore& clusterStore, Int_t station)
625 /// Ask the clustering to reconstruct new clusters around the track candidate position
626 /// in the 2 chambers of the given station
627 AskForNewClustersInChamber(trackParam, clusterStore, 2*station+1);
628 AskForNewClustersInChamber(trackParam, clusterStore, 2*station);
631 //__________________________________________________________________________
632 Double_t AliMUONVTrackReconstructor::TryOneCluster(const AliMUONTrackParam &trackParam, AliMUONVCluster* cluster,
633 AliMUONTrackParam &trackParamAtCluster, Bool_t updatePropagator)
635 /// Test the compatibility between the track and the cluster (using trackParam's covariance matrix):
636 /// return the corresponding Chi2
637 /// return trackParamAtCluster
639 // extrapolate track parameters and covariances at the z position of the tested cluster
640 // and set pointer to cluster into trackParamAtCluster
641 trackParamAtCluster = trackParam;
642 trackParamAtCluster.SetClusterPtr(cluster);
643 if (!AliMUONTrackExtrap::ExtrapToZCov(&trackParamAtCluster, cluster->GetZ(), updatePropagator))
644 return 2.*AliMUONTrack::MaxChi2();
646 // Set differences between trackParam and cluster in the bending and non bending directions
647 Double_t dX = cluster->GetX() - trackParamAtCluster.GetNonBendingCoor();
648 Double_t dY = cluster->GetY() - trackParamAtCluster.GetBendingCoor();
650 // Calculate errors and covariances
651 const TMatrixD& kParamCov = trackParamAtCluster.GetCovariances();
652 Double_t sigmaX2 = kParamCov(0,0) + cluster->GetErrX2();
653 Double_t sigmaY2 = kParamCov(2,2) + cluster->GetErrY2();
654 Double_t covXY = kParamCov(0,2);
655 Double_t det = sigmaX2 * sigmaY2 - covXY * covXY;
658 if (det == 0.) return 2.*AliMUONTrack::MaxChi2();
659 return (dX * dX * sigmaY2 + dY * dY * sigmaX2 - 2. * dX * dY * covXY) / det;
663 //__________________________________________________________________________
664 Bool_t AliMUONVTrackReconstructor::TryOneClusterFast(const AliMUONTrackParam &trackParam, const AliMUONVCluster* cluster)
666 /// Test the compatibility between the track and the cluster
667 /// given the track and cluster resolutions + the maximum-distance-to-track value
668 /// and assuming linear propagation of the track:
669 /// return kTRUE if they are compatibles
671 Double_t dZ = cluster->GetZ() - trackParam.GetZ();
672 Double_t dX = cluster->GetX() - (trackParam.GetNonBendingCoor() + trackParam.GetNonBendingSlope() * dZ);
673 Double_t dY = cluster->GetY() - (trackParam.GetBendingCoor() + trackParam.GetBendingSlope() * dZ);
674 const TMatrixD& kParamCov = trackParam.GetCovariances();
675 Double_t errX2 = kParamCov(0,0) + dZ * dZ * kParamCov(1,1) + 2. * dZ * kParamCov(0,1) + cluster->GetErrX2();
676 Double_t errY2 = kParamCov(2,2) + dZ * dZ * kParamCov(3,3) + 2. * dZ * kParamCov(2,3) + cluster->GetErrY2();
678 Double_t dXmax = GetRecoParam()->GetSigmaCutForTracking() * TMath::Sqrt(2. * errX2) +
679 GetRecoParam()->GetMaxNonBendingDistanceToTrack();
680 Double_t dYmax = GetRecoParam()->GetSigmaCutForTracking() * TMath::Sqrt(2. * errY2) +
681 GetRecoParam()->GetMaxBendingDistanceToTrack();
683 if (TMath::Abs(dX) > dXmax || TMath::Abs(dY) > dYmax) return kFALSE;
689 //__________________________________________________________________________
690 Double_t AliMUONVTrackReconstructor::TryTwoClustersFast(const AliMUONTrackParam &trackParamAtCluster1, AliMUONVCluster* cluster2,
691 AliMUONTrackParam &trackParamAtCluster2)
693 /// Test the compatibility between the track and the 2 clusters together (using trackParam's covariance matrix)
694 /// assuming linear propagation between the two clusters:
695 /// return the corresponding Chi2 accounting for covariances between the 2 clusters
696 /// return trackParamAtCluster2
698 // extrapolate linearly track parameters and covariances at the z position of the second cluster
699 trackParamAtCluster2 = trackParamAtCluster1;
700 AliMUONTrackExtrap::LinearExtrapToZCov(&trackParamAtCluster2, cluster2->GetZ());
702 // set pointer to cluster2 into trackParamAtCluster2
703 trackParamAtCluster2.SetClusterPtr(cluster2);
705 // Set differences between track and clusters in the bending and non bending directions
706 AliMUONVCluster* cluster1 = trackParamAtCluster1.GetClusterPtr();
707 Double_t dX1 = cluster1->GetX() - trackParamAtCluster1.GetNonBendingCoor();
708 Double_t dX2 = cluster2->GetX() - trackParamAtCluster2.GetNonBendingCoor();
709 Double_t dY1 = cluster1->GetY() - trackParamAtCluster1.GetBendingCoor();
710 Double_t dY2 = cluster2->GetY() - trackParamAtCluster2.GetBendingCoor();
712 // Calculate errors and covariances
713 const TMatrixD& kParamCov1 = trackParamAtCluster1.GetCovariances();
714 const TMatrixD& kParamCov2 = trackParamAtCluster2.GetCovariances();
715 Double_t dZ = trackParamAtCluster2.GetZ() - trackParamAtCluster1.GetZ();
716 Double_t sigma2X1 = kParamCov1(0,0) + cluster1->GetErrX2();
717 Double_t sigma2X2 = kParamCov2(0,0) + cluster2->GetErrX2();
718 Double_t covX1X2 = kParamCov1(0,0) + dZ * kParamCov1(0,1);
719 Double_t sigma2Y1 = kParamCov1(2,2) + cluster1->GetErrY2();
720 Double_t sigma2Y2 = kParamCov2(2,2) + cluster2->GetErrY2();
721 Double_t covY1Y2 = kParamCov1(2,2) + dZ * kParamCov1(2,3);
724 Double_t detX = sigma2X1 * sigma2X2 - covX1X2 * covX1X2;
725 Double_t detY = sigma2Y1 * sigma2Y2 - covY1Y2 * covY1Y2;
726 if (detX == 0. || detY == 0.) return 2.*AliMUONTrack::MaxChi2();
727 return (dX1 * dX1 * sigma2X2 + dX2 * dX2 * sigma2X1 - 2. * dX1 * dX2 * covX1X2) / detX
728 + (dY1 * dY1 * sigma2Y2 + dY2 * dY2 * sigma2Y1 - 2. * dY1 * dY2 * covY1Y2) / detY;
732 //__________________________________________________________________________
733 Bool_t AliMUONVTrackReconstructor::FollowLinearTrackInChamber(AliMUONTrack &trackCandidate, const AliMUONVClusterStore& clusterStore,
736 /// Follow trackCandidate in chamber(0..) nextChamber assuming linear propagation, and search for compatible cluster(s)
737 /// Keep all possibilities or only the best one(s) according to the flag fgkTrackAllTracks:
738 /// kTRUE: duplicate "trackCandidate" if there are several possibilities and add the new tracks at the end of
739 /// fRecTracksPtr to avoid conficts with other track candidates at this current stage of the tracking procedure.
740 /// Remove the obsolete "trackCandidate" at the end.
741 /// kFALSE: add only the best cluster(s) to the "trackCandidate". Try to add a couple of clusters in priority.
742 /// return kTRUE if new cluster(s) have been found (otherwise return kFALSE)
743 AliDebug(1,Form("Enter FollowLinearTrackInChamber(1..) %d", nextChamber+1));
745 Double_t chi2WithOneCluster = AliMUONTrack::MaxChi2();
746 Double_t maxChi2WithOneCluster = 2. * GetRecoParam()->GetSigmaCutForTracking() *
747 GetRecoParam()->GetSigmaCutForTracking(); // 2 because 2 quantities in chi2
748 Double_t bestChi2WithOneCluster = maxChi2WithOneCluster;
749 Bool_t foundOneCluster = kFALSE;
750 AliMUONTrack *newTrack = 0x0;
751 AliMUONVCluster *cluster;
752 AliMUONTrackParam trackParam;
753 AliMUONTrackParam extrapTrackParamAtCluster;
754 AliMUONTrackParam bestTrackParamAtCluster;
756 // Get track parameters according to the propagation direction
757 if (nextChamber > 7) trackParam = *(AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->Last();
758 else trackParam = *(AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->First();
760 // Printout for debuging
761 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 2) || (AliLog::GetGlobalDebugLevel() >= 2)) {
762 cout<<endl<<"Track parameters and covariances at first cluster:"<<endl;
763 trackParam.GetParameters().Print();
764 trackParam.GetCovariances().Print();
768 AliMUONTrackExtrap::AddMCSEffect(&trackParam,AliMUONConstants::ChamberThicknessInX0(trackParam.GetClusterPtr()->GetChamberId()),-1.);
770 // Printout for debuging
771 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
772 cout << "FollowLinearTrackInChamber: look for cluster in chamber(1..): " << nextChamber+1 << endl;
775 // Create iterators to loop over clusters in chamber
776 TIter next(clusterStore.CreateChamberIterator(nextChamber,nextChamber));
778 // look for candidates in chamber
779 while ( ( cluster = static_cast<AliMUONVCluster*>(next()) ) ) {
781 // try to add the current cluster fast
782 if (!TryOneClusterFast(trackParam, cluster)) continue;
784 // try to add the current cluster accuratly
785 extrapTrackParamAtCluster = trackParam;
786 AliMUONTrackExtrap::LinearExtrapToZCov(&extrapTrackParamAtCluster, cluster->GetZ());
787 chi2WithOneCluster = TryOneCluster(extrapTrackParamAtCluster, cluster, extrapTrackParamAtCluster);
789 // if good chi2 then consider to add cluster
790 if (chi2WithOneCluster < maxChi2WithOneCluster) {
791 foundOneCluster = kTRUE;
793 // Printout for debuging
794 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
795 cout << "FollowLinearTrackInChamber: found one cluster in chamber(1..): " << nextChamber+1
796 << " (Chi2 = " << chi2WithOneCluster << ")" << endl;
800 if (GetRecoParam()->TrackAllTracks()) {
801 // copy trackCandidate into a new track put at the end of fRecTracksPtr and add the new cluster
802 newTrack = new ((*fRecTracksPtr)[fRecTracksPtr->GetLast()+1]) AliMUONTrack(trackCandidate);
803 if (GetRecoParam()->RequestStation(nextChamber/2))
804 extrapTrackParamAtCluster.SetRemovable(kFALSE);
805 else extrapTrackParamAtCluster.SetRemovable(kTRUE);
806 newTrack->AddTrackParamAtCluster(extrapTrackParamAtCluster,*cluster);
807 newTrack->SetGlobalChi2(trackCandidate.GetGlobalChi2()+chi2WithOneCluster);
810 // Printout for debuging
811 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
812 cout << "FollowLinearTrackInChamber: added one cluster in chamber(1..): " << nextChamber+1 << endl;
813 if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump();
816 } else if (chi2WithOneCluster < bestChi2WithOneCluster) {
817 // keep track of the best cluster
818 bestChi2WithOneCluster = chi2WithOneCluster;
819 bestTrackParamAtCluster = extrapTrackParamAtCluster;
826 // fill out the best track if required else clean up the fRecTracksPtr array
827 if (!GetRecoParam()->TrackAllTracks()) {
828 if (foundOneCluster) {
829 if (GetRecoParam()->RequestStation(nextChamber/2))
830 bestTrackParamAtCluster.SetRemovable(kFALSE);
831 else bestTrackParamAtCluster.SetRemovable(kTRUE);
832 trackCandidate.AddTrackParamAtCluster(bestTrackParamAtCluster,*(bestTrackParamAtCluster.GetClusterPtr()));
833 trackCandidate.SetGlobalChi2(trackCandidate.GetGlobalChi2()+bestChi2WithOneCluster);
835 // Printout for debuging
836 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
837 cout << "FollowLinearTrackInChamber: added the best cluster in chamber(1..): " << bestTrackParamAtCluster.GetClusterPtr()->GetChamberId()+1 << endl;
838 if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump();
841 } else return kFALSE;
843 } else if (foundOneCluster) {
845 // remove obsolete track
846 fRecTracksPtr->Remove(&trackCandidate);
849 } else return kFALSE;
855 //__________________________________________________________________________
856 Bool_t AliMUONVTrackReconstructor::FollowLinearTrackInStation(AliMUONTrack &trackCandidate, const AliMUONVClusterStore& clusterStore,
859 /// Follow trackCandidate in station(0..) nextStation assuming linear propagation, and search for compatible cluster(s)
860 /// Keep all possibilities or only the best one(s) according to the flag fgkTrackAllTracks:
861 /// kTRUE: duplicate "trackCandidate" if there are several possibilities and add the new tracks at the end of
862 /// fRecTracksPtr to avoid conficts with other track candidates at this current stage of the tracking procedure.
863 /// Remove the obsolete "trackCandidate" at the end.
864 /// kFALSE: add only the best cluster(s) to the "trackCandidate". Try to add a couple of clusters in priority.
865 /// return kTRUE if new cluster(s) have been found (otherwise return kFALSE)
866 AliDebug(1,Form("Enter FollowLinearTrackInStation(1..) %d", nextStation+1));
868 // Order the chamber according to the propagation direction (tracking starts with chamber 2):
869 // - nextStation == station(1...) 5 => forward propagation
870 // - nextStation < station(1...) 5 => backward propagation
872 if (nextStation==4) {
873 ch1 = 2*nextStation+1;
877 ch2 = 2*nextStation+1;
880 Double_t chi2WithOneCluster = AliMUONTrack::MaxChi2();
881 Double_t chi2WithTwoClusters = AliMUONTrack::MaxChi2();
882 Double_t maxChi2WithOneCluster = 2. * GetRecoParam()->GetSigmaCutForTracking() *
883 GetRecoParam()->GetSigmaCutForTracking(); // 2 because 2 quantities in chi2
884 Double_t maxChi2WithTwoClusters = 4. * GetRecoParam()->GetSigmaCutForTracking() *
885 GetRecoParam()->GetSigmaCutForTracking(); // 4 because 4 quantities in chi2
886 Double_t bestChi2WithOneCluster = maxChi2WithOneCluster;
887 Double_t bestChi2WithTwoClusters = maxChi2WithTwoClusters;
888 Bool_t foundOneCluster = kFALSE;
889 Bool_t foundTwoClusters = kFALSE;
890 AliMUONTrack *newTrack = 0x0;
891 AliMUONVCluster *clusterCh1, *clusterCh2;
892 AliMUONTrackParam trackParam;
893 AliMUONTrackParam extrapTrackParamAtCluster1;
894 AliMUONTrackParam extrapTrackParamAtCluster2;
895 AliMUONTrackParam bestTrackParamAtCluster1;
896 AliMUONTrackParam bestTrackParamAtCluster2;
898 Int_t nClusters = clusterStore.GetSize();
899 Bool_t *clusterCh1Used = new Bool_t[nClusters];
900 for (Int_t i = 0; i < nClusters; i++) clusterCh1Used[i] = kFALSE;
903 // Get track parameters according to the propagation direction
904 if (nextStation==4) trackParam = *(AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->Last();
905 else trackParam = *(AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->First();
907 // Printout for debuging
908 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 2) || (AliLog::GetGlobalDebugLevel() >= 2)) {
909 cout<<endl<<"Track parameters and covariances at first cluster:"<<endl;
910 trackParam.GetParameters().Print();
911 trackParam.GetCovariances().Print();
915 AliMUONTrackExtrap::AddMCSEffect(&trackParam,AliMUONConstants::ChamberThicknessInX0(trackParam.GetClusterPtr()->GetChamberId()),-1.);
917 // Printout for debuging
918 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
919 cout << "FollowLinearTrackInStation: look for clusters in chamber(1..): " << ch2+1 << endl;
922 // Create iterators to loop over clusters in both chambers
923 TIter nextInCh1(clusterStore.CreateChamberIterator(ch1,ch1));
924 TIter nextInCh2(clusterStore.CreateChamberIterator(ch2,ch2));
926 // look for candidates in chamber 2
927 while ( ( clusterCh2 = static_cast<AliMUONVCluster*>(nextInCh2()) ) ) {
929 // try to add the current cluster fast
930 if (!TryOneClusterFast(trackParam, clusterCh2)) continue;
932 // try to add the current cluster accuratly
933 extrapTrackParamAtCluster2 = trackParam;
934 AliMUONTrackExtrap::LinearExtrapToZCov(&extrapTrackParamAtCluster2, clusterCh2->GetZ());
935 chi2WithOneCluster = TryOneCluster(extrapTrackParamAtCluster2, clusterCh2, extrapTrackParamAtCluster2);
937 // if good chi2 then try to attach a cluster in the other chamber too
938 if (chi2WithOneCluster < maxChi2WithOneCluster) {
939 Bool_t foundSecondCluster = kFALSE;
941 // Printout for debuging
942 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
943 cout << "FollowLinearTrackInStation: found one cluster in chamber(1..): " << ch2+1
944 << " (Chi2 = " << chi2WithOneCluster << ")" << endl;
946 cout << " look for second clusters in chamber(1..): " << ch1+1 << " ..." << endl;
950 AliMUONTrackExtrap::AddMCSEffect(&extrapTrackParamAtCluster2,AliMUONConstants::ChamberThicknessInX0(ch2),-1.);
952 // reset cluster iterator of chamber 1
956 // look for second candidates in chamber 1
957 while ( ( clusterCh1 = static_cast<AliMUONVCluster*>(nextInCh1()) ) ) {
960 // try to add the current cluster fast
961 if (!TryOneClusterFast(extrapTrackParamAtCluster2, clusterCh1)) continue;
963 // try to add the current cluster in addition to the one found in the previous chamber
964 chi2WithTwoClusters = TryTwoClustersFast(extrapTrackParamAtCluster2, clusterCh1, extrapTrackParamAtCluster1);
966 // if good chi2 then consider to add the 2 clusters to the "trackCandidate"
967 if (chi2WithTwoClusters < maxChi2WithTwoClusters) {
968 foundSecondCluster = kTRUE;
969 foundTwoClusters = kTRUE;
971 // Printout for debuging
972 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
973 cout << "FollowLinearTrackInStation: found one cluster in chamber(1..): " << ch1+1
974 << " (Chi2 = " << chi2WithTwoClusters << ")" << endl;
978 if (GetRecoParam()->TrackAllTracks()) {
979 // copy trackCandidate into a new track put at the end of fRecTracksPtr and add the new clusters
980 newTrack = new ((*fRecTracksPtr)[fRecTracksPtr->GetLast()+1]) AliMUONTrack(trackCandidate);
981 extrapTrackParamAtCluster1.SetRemovable(kTRUE);
982 newTrack->AddTrackParamAtCluster(extrapTrackParamAtCluster1,*clusterCh1);
983 extrapTrackParamAtCluster2.SetRemovable(kTRUE);
984 newTrack->AddTrackParamAtCluster(extrapTrackParamAtCluster2,*clusterCh2);
985 newTrack->SetGlobalChi2(newTrack->GetGlobalChi2()+chi2WithTwoClusters);
988 // Tag clusterCh1 as used
989 clusterCh1Used[iCluster1] = kTRUE;
991 // Printout for debuging
992 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
993 cout << "FollowLinearTrackInStation: added two clusters in station(1..): " << nextStation+1 << endl;
994 if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump();
997 } else if (chi2WithTwoClusters < bestChi2WithTwoClusters) {
998 // keep track of the best couple of clusters
999 bestChi2WithTwoClusters = chi2WithTwoClusters;
1000 bestTrackParamAtCluster1 = extrapTrackParamAtCluster1;
1001 bestTrackParamAtCluster2 = extrapTrackParamAtCluster2;
1008 // if no cluster found in chamber1 then consider to add clusterCh2 only
1009 if (!foundSecondCluster) {
1010 foundOneCluster = kTRUE;
1012 if (GetRecoParam()->TrackAllTracks()) {
1013 // copy trackCandidate into a new track put at the end of fRecTracksPtr and add the new cluster
1014 newTrack = new ((*fRecTracksPtr)[fRecTracksPtr->GetLast()+1]) AliMUONTrack(trackCandidate);
1015 if (GetRecoParam()->RequestStation(nextStation))
1016 extrapTrackParamAtCluster2.SetRemovable(kFALSE);
1017 else extrapTrackParamAtCluster2.SetRemovable(kTRUE);
1018 newTrack->AddTrackParamAtCluster(extrapTrackParamAtCluster2,*clusterCh2);
1019 newTrack->SetGlobalChi2(newTrack->GetGlobalChi2()+chi2WithOneCluster);
1022 // Printout for debuging
1023 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
1024 cout << "FollowLinearTrackInStation: added one cluster in chamber(1..): " << ch2+1 << endl;
1025 if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump();
1028 } else if (!foundTwoClusters && chi2WithOneCluster < bestChi2WithOneCluster) {
1029 // keep track of the best cluster except if a couple of clusters has already been found
1030 bestChi2WithOneCluster = chi2WithOneCluster;
1031 bestTrackParamAtCluster1 = extrapTrackParamAtCluster2;
1040 // look for candidates in chamber 1 not already attached to a track
1041 // if we want to keep all possible tracks or if no good couple of clusters has been found
1042 if (GetRecoParam()->TrackAllTracks() || !foundTwoClusters) {
1044 // Printout for debuging
1045 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
1046 cout << "FollowLinearTrackInStation: look for single cluster in chamber(1..): " << ch1+1 << endl;
1049 //Extrapolate trackCandidate to chamber "ch2"
1050 AliMUONTrackExtrap::LinearExtrapToZCov(&trackParam, AliMUONConstants::DefaultChamberZ(ch2));
1052 // add MCS effect for next step
1053 AliMUONTrackExtrap::AddMCSEffect(&trackParam,AliMUONConstants::ChamberThicknessInX0(ch2),-1.);
1055 // reset cluster iterator of chamber 1
1059 // look for second candidates in chamber 1
1060 while ( ( clusterCh1 = static_cast<AliMUONVCluster*>(nextInCh1()) ) ) {
1063 if (clusterCh1Used[iCluster1]) continue; // Skip clusters already used
1065 // try to add the current cluster fast
1066 if (!TryOneClusterFast(trackParam, clusterCh1)) continue;
1068 // try to add the current cluster accuratly
1069 extrapTrackParamAtCluster1 = trackParam;
1070 AliMUONTrackExtrap::LinearExtrapToZCov(&extrapTrackParamAtCluster1, clusterCh1->GetZ());
1071 chi2WithOneCluster = TryOneCluster(extrapTrackParamAtCluster1, clusterCh1, extrapTrackParamAtCluster1);
1073 // if good chi2 then consider to add clusterCh1
1074 // We do not try to attach a cluster in the other chamber too since it has already been done above
1075 if (chi2WithOneCluster < maxChi2WithOneCluster) {
1076 foundOneCluster = kTRUE;
1078 // Printout for debuging
1079 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
1080 cout << "FollowLinearTrackInStation: found one cluster in chamber(1..): " << ch1+1
1081 << " (Chi2 = " << chi2WithOneCluster << ")" << endl;
1082 clusterCh1->Print();
1085 if (GetRecoParam()->TrackAllTracks()) {
1086 // copy trackCandidate into a new track put at the end of fRecTracksPtr and add the new cluster
1087 newTrack = new ((*fRecTracksPtr)[fRecTracksPtr->GetLast()+1]) AliMUONTrack(trackCandidate);
1088 if (GetRecoParam()->RequestStation(nextStation))
1089 extrapTrackParamAtCluster1.SetRemovable(kFALSE);
1090 else extrapTrackParamAtCluster1.SetRemovable(kTRUE);
1091 newTrack->AddTrackParamAtCluster(extrapTrackParamAtCluster1,*clusterCh1);
1092 newTrack->SetGlobalChi2(newTrack->GetGlobalChi2()+chi2WithOneCluster);
1095 // Printout for debuging
1096 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
1097 cout << "FollowLinearTrackInStation: added one cluster in chamber(1..): " << ch1+1 << endl;
1098 if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump();
1101 } else if (chi2WithOneCluster < bestChi2WithOneCluster) {
1102 // keep track of the best cluster except if a couple of clusters has already been found
1103 bestChi2WithOneCluster = chi2WithOneCluster;
1104 bestTrackParamAtCluster1 = extrapTrackParamAtCluster1;
1113 // fill out the best track if required else clean up the fRecTracksPtr array
1114 if (!GetRecoParam()->TrackAllTracks()) {
1115 if (foundTwoClusters) {
1116 bestTrackParamAtCluster1.SetRemovable(kTRUE);
1117 trackCandidate.AddTrackParamAtCluster(bestTrackParamAtCluster1,*(bestTrackParamAtCluster1.GetClusterPtr()));
1118 bestTrackParamAtCluster2.SetRemovable(kTRUE);
1119 trackCandidate.AddTrackParamAtCluster(bestTrackParamAtCluster2,*(bestTrackParamAtCluster2.GetClusterPtr()));
1120 trackCandidate.SetGlobalChi2(trackCandidate.GetGlobalChi2()+bestChi2WithTwoClusters);
1122 // Printout for debuging
1123 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
1124 cout << "FollowLinearTrackInStation: added the two best clusters in station(1..): " << nextStation+1 << endl;
1125 if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump();
1128 } else if (foundOneCluster) {
1129 if (GetRecoParam()->RequestStation(nextStation))
1130 bestTrackParamAtCluster1.SetRemovable(kFALSE);
1131 else bestTrackParamAtCluster1.SetRemovable(kTRUE);
1132 trackCandidate.AddTrackParamAtCluster(bestTrackParamAtCluster1,*(bestTrackParamAtCluster1.GetClusterPtr()));
1133 trackCandidate.SetGlobalChi2(trackCandidate.GetGlobalChi2()+bestChi2WithOneCluster);
1135 // Printout for debuging
1136 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
1137 cout << "FollowLinearTrackInStation: added the best cluster in chamber(1..): " << bestTrackParamAtCluster1.GetClusterPtr()->GetChamberId()+1 << endl;
1138 if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump();
1142 delete [] clusterCh1Used;
1146 } else if (foundOneCluster || foundTwoClusters) {
1148 // remove obsolete track
1149 fRecTracksPtr->Remove(&trackCandidate);
1153 delete [] clusterCh1Used;
1157 delete [] clusterCh1Used;
1162 //__________________________________________________________________________
1163 void AliMUONVTrackReconstructor::ImproveTracks()
1165 /// Improve tracks by removing clusters with local chi2 highter than the defined cut
1166 /// Recompute track parameters and covariances at the remaining clusters
1167 AliDebug(1,"Enter ImproveTracks");
1169 AliMUONTrack *track, *nextTrack;
1171 track = (AliMUONTrack*) fRecTracksPtr->First();
1174 // prepare next track in case the actual track is suppressed
1175 nextTrack = (AliMUONTrack*) fRecTracksPtr->After(track);
1177 ImproveTrack(*track);
1179 // remove track if improvement failed
1180 if (!track->IsImproved()) {
1181 fRecTracksPtr->Remove(track);
1188 // compress the array in case of some tracks have been removed
1189 fRecTracksPtr->Compress();
1193 //__________________________________________________________________________
1194 void AliMUONVTrackReconstructor::Finalize()
1196 /// Recompute track parameters and covariances at each attached cluster from those at the first one
1197 /// Set the label pointing to the corresponding MC track
1198 /// Remove the track if finalization failed
1200 AliMUONTrack *track, *nextTrack;
1201 Bool_t trackRemoved = kFALSE;
1203 track = (AliMUONTrack*) fRecTracksPtr->First();
1206 nextTrack = (AliMUONTrack*) fRecTracksPtr->After(track);
1208 if (FinalizeTrack(*track)) track->FindMCLabel();
1210 fRecTracksPtr->Remove(track);
1212 trackRemoved = kTRUE;
1219 // compress array of tracks if needed
1220 if (trackRemoved) fRecTracksPtr->Compress();
1224 //__________________________________________________________________________
1225 void AliMUONVTrackReconstructor::ValidateTracksWithTrigger(AliMUONVTrackStore& trackStore,
1226 const AliMUONVTriggerTrackStore& triggerTrackStore,
1227 const AliMUONVTriggerStore& triggerStore,
1228 const AliMUONTrackHitPattern& trackHitPattern)
1230 /// Try to match track from tracking system with trigger track
1231 AliCodeTimerAuto("",0);
1233 trackHitPattern.ExecuteValidation(trackStore, triggerTrackStore, triggerStore);
1236 //__________________________________________________________________________
1237 void AliMUONVTrackReconstructor::EventReconstructTrigger(const AliMUONTriggerCircuit& circuit,
1238 const AliMUONVTriggerStore& triggerStore,
1239 AliMUONVTriggerTrackStore& triggerTrackStore)
1241 /// To make the trigger tracks from Local Trigger
1243 AliCodeTimerAuto("",0);
1245 AliMUONGlobalTrigger* globalTrigger = triggerStore.Global();
1247 UChar_t gloTrigPat = 0;
1251 gloTrigPat = globalTrigger->GetGlobalResponse();
1254 TIter next(triggerStore.CreateIterator());
1255 AliMUONLocalTrigger* locTrg(0x0);
1257 Float_t z11 = AliMUONConstants::DefaultChamberZ(10);
1258 Float_t z21 = AliMUONConstants::DefaultChamberZ(12);
1260 AliMUONTriggerTrack triggerTrack;
1262 while ( ( locTrg = static_cast<AliMUONLocalTrigger*>(next()) ) )
1264 Bool_t xTrig=locTrg->IsTrigX();
1265 Bool_t yTrig=locTrg->IsTrigY();
1267 Int_t localBoardId = locTrg->LoCircuit();
1270 { // make Trigger Track if trigger in X and Y
1272 Float_t y11 = circuit.GetY11Pos(localBoardId, locTrg->LoStripX());
1273 // need first to convert deviation to [0-30]
1274 // (see AliMUONLocalTriggerBoard::LocalTrigger)
1275 Int_t deviation = locTrg->GetDeviation();
1276 Int_t stripX21 = locTrg->LoStripX()+deviation+1;
1277 Float_t y21 = circuit.GetY21Pos(localBoardId, stripX21);
1278 Float_t x11 = circuit.GetX11Pos(localBoardId, locTrg->LoStripY());
1280 AliDebug(1, Form(" MakeTriggerTrack %d %d %d %d %f %f %f \n",locTrg->LoCircuit(),
1281 locTrg->LoStripX(),locTrg->LoStripX()+locTrg->LoDev()+1,locTrg->LoStripY(),y11, y21, x11));
1283 Float_t thetax = TMath::ATan2( x11 , z11 );
1284 Float_t thetay = TMath::ATan2( (y21-y11) , (z21-z11) );
1286 CorrectThetaRange(thetax);
1287 CorrectThetaRange(thetay);
1289 triggerTrack.SetX11(x11);
1290 triggerTrack.SetY11(y11);
1291 triggerTrack.SetThetax(thetax);
1292 triggerTrack.SetThetay(thetay);
1293 triggerTrack.SetGTPattern(gloTrigPat);
1294 triggerTrack.SetLoTrgNum(localBoardId);
1296 triggerTrackStore.Add(triggerTrack);
1298 } // end of loop on Local Trigger
1301 //__________________________________________________________________________
1302 void AliMUONVTrackReconstructor::CorrectThetaRange(Float_t& theta)
1304 /// The angles of the trigger tracks, obtained with ATan2,
1305 /// have values around +pi and -pi. On the contrary, the angles
1306 /// used in the tracker tracks have values around 0.
1307 /// This function sets the same range for the trigger tracks angles.
1308 if (theta < -TMath::PiOver2()) theta += TMath::Pi();
1309 else if(theta > TMath::PiOver2()) theta -= TMath::Pi();