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"
81 #include "AliMpDDLStore.h"
82 #include "AliMpVSegmentation.h"
83 #include "AliMpSegmentation.h"
87 #include "AliCodeTimer.h"
88 #include "AliTracker.h"
90 #include <TClonesArray.h>
95 #include <Riostream.h>
98 ClassImp(AliMUONVTrackReconstructor) // Class implementation in ROOT context
101 //__________________________________________________________________________
102 AliMUONVTrackReconstructor::AliMUONVTrackReconstructor(const AliMUONRecoParam* recoParam,
103 AliMUONVClusterServer* clusterServer)
107 fClusterServer(clusterServer),
108 fkRecoParam(recoParam),
111 /// Constructor for class AliMUONVTrackReconstructor
112 /// WARNING: if clusterServer=0x0, no clusterization will be possible at this level
114 // Memory allocation for the TClonesArray of reconstructed tracks
115 fRecTracksPtr = new TClonesArray("AliMUONTrack", 100);
117 // set the magnetic field for track extrapolations
118 AliMUONTrackExtrap::SetField();
120 // set the maximum MCS angle in chamber from the minimum acceptable momentum
121 AliMUONTrackParam param;
122 Double_t inverseBendingP = (GetRecoParam()->GetMinBendingMomentum() > 0.) ? 1./GetRecoParam()->GetMinBendingMomentum() : 1.;
123 param.SetInverseBendingMomentum(inverseBendingP);
124 fMaxMCSAngle2 = new Double_t [AliMUONConstants::NTrackingCh()];
125 for (Int_t iCh=0; iCh<AliMUONConstants::NTrackingCh(); iCh++)
126 fMaxMCSAngle2[iCh] = AliMUONTrackExtrap::GetMCSAngle2(param, AliMUONConstants::ChamberThicknessInX0(iCh), 1.);
130 //__________________________________________________________________________
131 AliMUONVTrackReconstructor::~AliMUONVTrackReconstructor()
133 /// Destructor for class AliMUONVTrackReconstructor
134 delete fRecTracksPtr;
135 delete[] fMaxMCSAngle2;
138 //__________________________________________________________________________
139 void AliMUONVTrackReconstructor::ResetTracks()
141 /// To reset the TClonesArray of reconstructed tracks
142 if (fRecTracksPtr) fRecTracksPtr->Clear("C");
147 //__________________________________________________________________________
148 void AliMUONVTrackReconstructor::EventReconstruct(AliMUONVClusterStore& clusterStore, AliMUONVTrackStore& trackStore)
150 /// To reconstruct one event
152 AliCodeTimerAuto("",0);
154 // Reset array of tracks
157 // Look for candidates from clusters in stations(1..) 4 and 5 (abort in case of failure)
158 if (!MakeTrackCandidates(clusterStore)) return;
160 // Look for extra candidates from clusters in stations(1..) 4 and 5 (abort in case of failure)
161 if (GetRecoParam()->MakeMoreTrackCandidates()) {
162 if (!MakeMoreTrackCandidates(clusterStore)) return;
165 // Stop tracking if no candidate found
166 if (fRecTracksPtr->GetEntriesFast() == 0) return;
168 // Follow tracks in stations(1..) 3, 2 and 1 (abort in case of failure)
169 if (!FollowTracks(clusterStore)) return;
171 // Complement the reconstructed tracks
172 if (GetRecoParam()->ComplementTracks()) {
173 if (ComplementTracks(clusterStore)) RemoveIdenticalTracks();
176 // Improve the reconstructed tracks
177 if (GetRecoParam()->ImproveTracks()) ImproveTracks();
179 // Remove connected tracks
180 if (GetRecoParam()->RemoveConnectedTracksInSt12()) RemoveConnectedTracks(kFALSE);
181 else RemoveConnectedTracks(kTRUE);
183 // Fill AliMUONTrack data members
186 // Add tracks to MUON data container
187 for (Int_t i=0; i<fNRecTracks; ++i)
189 AliMUONTrack * track = (AliMUONTrack*) fRecTracksPtr->At(i);
190 if (track->GetGlobalChi2() < AliMUONTrack::MaxChi2()) {
191 track->SetUniqueID(i+1);
192 trackStore.Add(*track);
193 } else AliWarning("problem occur somewhere during track refitting --> discard track");
197 //__________________________________________________________________________
198 Bool_t AliMUONVTrackReconstructor::IsAcceptable(AliMUONTrackParam &trackParam)
200 /// Return kTRUE if the track is within given limits on momentum/angle/origin
202 const TMatrixD& kParamCov = trackParam.GetCovariances();
203 Int_t chamber = trackParam.GetClusterPtr()->GetChamberId();
204 Double_t z = trackParam.GetZ();
205 Double_t sigmaCut = GetRecoParam()->GetSigmaCutForTracking();
208 Double_t angleMCS2 = 0.;
209 Double_t impactMCS2 = 0.;
210 if (AliMUONTrackExtrap::IsFieldON() && chamber < 6) {
212 // track momentum is known
213 for (Int_t iCh=0; iCh<=chamber; iCh++) {
214 Double_t localMCS2 = AliMUONTrackExtrap::GetMCSAngle2(trackParam, AliMUONConstants::ChamberThicknessInX0(iCh), 1.);
215 angleMCS2 += localMCS2;
216 impactMCS2 += AliMUONConstants::DefaultChamberZ(chamber) * AliMUONConstants::DefaultChamberZ(chamber) * localMCS2;
221 // track momentum is unknown
222 for (Int_t iCh=0; iCh<=chamber; iCh++) {
223 angleMCS2 += fMaxMCSAngle2[iCh];
224 impactMCS2 += AliMUONConstants::DefaultChamberZ(chamber) * AliMUONConstants::DefaultChamberZ(chamber) * fMaxMCSAngle2[iCh];
229 // ------ track selection in non bending direction ------
230 if (GetRecoParam()->SelectOnTrackSlope()) {
232 // check if non bending slope is within tolerances
233 Double_t nonBendingSlopeErr = TMath::Sqrt(kParamCov(1,1) + angleMCS2);
234 if ((TMath::Abs(trackParam.GetNonBendingSlope()) - sigmaCut * nonBendingSlopeErr) > GetRecoParam()->GetMaxNonBendingSlope()) return kFALSE;
238 // or check if non bending impact parameter is within tolerances
239 Double_t nonBendingImpactParam = TMath::Abs(trackParam.GetNonBendingCoor() - z * trackParam.GetNonBendingSlope());
240 Double_t nonBendingImpactParamErr = TMath::Sqrt(kParamCov(0,0) + z * z * kParamCov(1,1) - 2. * z * kParamCov(0,1) + impactMCS2);
241 if ((nonBendingImpactParam - sigmaCut * nonBendingImpactParamErr) > (3. * GetRecoParam()->GetNonBendingVertexDispersion())) return kFALSE;
245 // ------ track selection in bending direction ------
246 if (AliMUONTrackExtrap::IsFieldON()) { // depending whether the field is ON or OFF
248 // check if bending momentum is within tolerances
249 Double_t bendingMomentum = TMath::Abs(1. / trackParam.GetInverseBendingMomentum());
250 Double_t bendingMomentumErr = TMath::Sqrt(kParamCov(4,4)) * bendingMomentum * bendingMomentum;
251 if (chamber < 6 && (bendingMomentum + sigmaCut * bendingMomentumErr) < GetRecoParam()->GetMinBendingMomentum()) return kFALSE;
252 else if ((bendingMomentum + 3. * bendingMomentumErr) < GetRecoParam()->GetMinBendingMomentum()) return kFALSE;
256 if (GetRecoParam()->SelectOnTrackSlope()) {
258 // check if bending slope is within tolerances
259 Double_t bendingSlopeErr = TMath::Sqrt(kParamCov(3,3) + angleMCS2);
260 if ((TMath::Abs(trackParam.GetBendingSlope()) - sigmaCut * bendingSlopeErr) > GetRecoParam()->GetMaxBendingSlope()) return kFALSE;
264 // or check if bending impact parameter is within tolerances
265 Double_t bendingImpactParam = TMath::Abs(trackParam.GetBendingCoor() - z * trackParam.GetBendingSlope());
266 Double_t bendingImpactParamErr = TMath::Sqrt(kParamCov(2,2) + z * z * kParamCov(3,3) - 2. * z * kParamCov(2,3) + impactMCS2);
267 if ((bendingImpactParam - sigmaCut * bendingImpactParamErr) > (3. * GetRecoParam()->GetBendingVertexDispersion())) return kFALSE;
277 //__________________________________________________________________________
278 TClonesArray* AliMUONVTrackReconstructor::MakeSegmentsBetweenChambers(const AliMUONVClusterStore& clusterStore, Int_t ch1, Int_t ch2)
280 /// To make the list of segments from the list of clusters in the 2 given chambers.
281 /// Return a new TClonesArray of segments.
282 /// It is the responsibility of the user to delete it afterward.
283 AliDebug(1,Form("Enter MakeSegmentsBetweenChambers (1..) %d-%d", ch1+1, ch2+1));
284 AliCodeTimerAuto("",0);
286 AliMUONVCluster *cluster1, *cluster2;
287 AliMUONObjectPair *segment;
288 Double_t z1 = 0., z2 = 0., dZ = 0.;
289 Double_t nonBendingSlope = 0., nonBendingSlopeErr = 0., nonBendingImpactParam = 0., nonBendingImpactParamErr = 0.;
290 Double_t bendingSlope = 0., bendingSlopeErr = 0., bendingImpactParam = 0., bendingImpactParamErr = 0., bendingImpactParamErr2 = 0.;
291 Double_t bendingMomentum = 0., bendingMomentumErr = 0.;
292 Double_t bendingVertexDispersion2 = GetRecoParam()->GetBendingVertexDispersion() * GetRecoParam()->GetBendingVertexDispersion();
293 Double_t angleMCS2 = 0.; // maximum angular dispersion**2 due to MCS in chamber
294 Double_t impactMCS2 = 0.; // maximum impact parameter dispersion**2 due to MCS in chamber
295 for (Int_t iCh=0; iCh<=ch1; iCh++) {
296 angleMCS2 += fMaxMCSAngle2[iCh];
297 impactMCS2 += AliMUONConstants::DefaultChamberZ(iCh) * AliMUONConstants::DefaultChamberZ(iCh) * fMaxMCSAngle2[iCh];
299 Double_t sigmaCut = GetRecoParam()->GetSigmaCutForTracking();
301 // Create iterators to loop over clusters in both chambers
302 TIter nextInCh1(clusterStore.CreateChamberIterator(ch1,ch1));
303 TIter nextInCh2(clusterStore.CreateChamberIterator(ch2,ch2));
306 TClonesArray *segments = new TClonesArray("AliMUONObjectPair", 100);
308 // Loop over clusters in the first chamber of the station
309 while ( ( cluster1 = static_cast<AliMUONVCluster*>(nextInCh1()) ) ) {
310 z1 = cluster1->GetZ();
312 // reset cluster iterator of chamber 2
315 // Loop over clusters in the second chamber of the station
316 while ( ( cluster2 = static_cast<AliMUONVCluster*>(nextInCh2()) ) ) {
317 z2 = cluster2->GetZ();
320 // ------ track selection in non bending direction ------
321 nonBendingSlope = (cluster1->GetX() - cluster2->GetX()) / dZ;
322 if (GetRecoParam()->SelectOnTrackSlope()) {
324 // check if non bending slope is within tolerances
325 nonBendingSlopeErr = TMath::Sqrt((cluster1->GetErrX2() + cluster2->GetErrX2()) / dZ / dZ + angleMCS2);
326 if ((TMath::Abs(nonBendingSlope) - sigmaCut * nonBendingSlopeErr) > GetRecoParam()->GetMaxNonBendingSlope()) continue;
330 // or check if non bending impact parameter is within tolerances
331 nonBendingImpactParam = TMath::Abs(cluster1->GetX() - cluster1->GetZ() * nonBendingSlope);
332 nonBendingImpactParamErr = TMath::Sqrt((z1 * z1 * cluster2->GetErrX2() + z2 * z2 * cluster1->GetErrX2()) / dZ / dZ + impactMCS2);
333 if ((nonBendingImpactParam - sigmaCut * nonBendingImpactParamErr) > (3. * GetRecoParam()->GetNonBendingVertexDispersion())) continue;
337 // ------ track selection in bending direction ------
338 bendingSlope = (cluster1->GetY() - cluster2->GetY()) / dZ;
339 if (AliMUONTrackExtrap::IsFieldON()) { // depending whether the field is ON or OFF
341 // check if bending momentum is within tolerances
342 bendingImpactParam = cluster1->GetY() - cluster1->GetZ() * bendingSlope;
343 bendingImpactParamErr2 = (z1 * z1 * cluster2->GetErrY2() + z2 * z2 * cluster1->GetErrY2()) / dZ / dZ + impactMCS2;
344 bendingMomentum = TMath::Abs(AliMUONTrackExtrap::GetBendingMomentumFromImpactParam(bendingImpactParam));
345 bendingMomentumErr = TMath::Sqrt((bendingVertexDispersion2 + bendingImpactParamErr2) /
346 bendingImpactParam / bendingImpactParam + 0.01) * bendingMomentum;
347 if ((bendingMomentum + 3. * bendingMomentumErr) < GetRecoParam()->GetMinBendingMomentum()) continue;
351 if (GetRecoParam()->SelectOnTrackSlope()) {
353 // check if bending slope is within tolerances
354 bendingSlopeErr = TMath::Sqrt((cluster1->GetErrY2() + cluster2->GetErrY2()) / dZ / dZ + angleMCS2);
355 if ((TMath::Abs(bendingSlope) - sigmaCut * bendingSlopeErr) > GetRecoParam()->GetMaxBendingSlope()) continue;
359 // or check if bending impact parameter is within tolerances
360 bendingImpactParam = TMath::Abs(cluster1->GetY() - cluster1->GetZ() * bendingSlope);
361 bendingImpactParamErr = TMath::Sqrt((z1 * z1 * cluster2->GetErrY2() + z2 * z2 * cluster1->GetErrY2()) / dZ / dZ + impactMCS2);
362 if ((bendingImpactParam - sigmaCut * bendingImpactParamErr) > (3. * GetRecoParam()->GetBendingVertexDispersion())) continue;
369 segment = new ((*segments)[segments->GetLast()+1]) AliMUONObjectPair(cluster1, cluster2, kFALSE, kFALSE);
371 // Printout for debug
372 if (AliLog::GetGlobalDebugLevel() > 1) {
373 cout << "segmentIndex(0...): " << segments->GetLast() << endl;
375 cout << "Cluster in first chamber" << endl;
377 cout << "Cluster in second chamber" << endl;
385 // Printout for debug
386 AliDebug(1,Form("chambers%d-%d: NSegments = %d ", ch1+1, ch2+1, segments->GetEntriesFast()));
391 //__________________________________________________________________________
392 void AliMUONVTrackReconstructor::RemoveUsedSegments(TClonesArray& segments)
394 /// To remove pairs of clusters already attached to a track
395 AliDebug(1,"Enter RemoveUsedSegments");
396 Int_t nSegments = segments.GetEntriesFast();
397 Int_t nTracks = fRecTracksPtr->GetEntriesFast();
398 AliMUONObjectPair *segment;
400 AliMUONVCluster *cluster, *cluster1, *cluster2;
401 Bool_t foundCluster1, foundCluster2, removeSegment;
403 // Loop over segments
404 for (Int_t iSegment=0; iSegment<nSegments; iSegment++) {
405 segment = (AliMUONObjectPair*) segments.UncheckedAt(iSegment);
407 cluster1 = (AliMUONVCluster*) segment->First();
408 cluster2 = (AliMUONVCluster*) segment->Second();
409 removeSegment = kFALSE;
412 for (Int_t iTrack = 0; iTrack < nTracks; iTrack++) {
413 track = (AliMUONTrack*) fRecTracksPtr->UncheckedAt(iTrack);
416 if (!track) continue;
418 foundCluster1 = kFALSE;
419 foundCluster2 = kFALSE;
421 // Loop over clusters
422 Int_t nClusters = track->GetNClusters();
423 for (Int_t iCluster = 0; iCluster < nClusters; iCluster++) {
424 cluster = ((AliMUONTrackParam*) track->GetTrackParamAtCluster()->UncheckedAt(iCluster))->GetClusterPtr();
426 // check if both clusters are in that track
427 if (cluster == cluster1) foundCluster1 = kTRUE;
428 else if (cluster == cluster2) foundCluster2 = kTRUE;
430 if (foundCluster1 && foundCluster2) {
431 removeSegment = kTRUE;
437 if (removeSegment) break;
441 if (removeSegment) segments.RemoveAt(iSegment);
447 // Printout for debug
448 AliDebug(1,Form("NSegments = %d ", segments.GetEntriesFast()));
451 //__________________________________________________________________________
452 void AliMUONVTrackReconstructor::RemoveIdenticalTracks()
454 /// To remove identical tracks:
455 /// Tracks are considered identical if they have all their clusters in common.
456 /// One keeps the track with the larger number of clusters if need be
457 AliMUONTrack *track1, *track2;
458 Int_t nTracks = fRecTracksPtr->GetEntriesFast();
459 Int_t clustersInCommon, nClusters1, nClusters2;
460 // Loop over first track of the pair
461 for (Int_t iTrack1 = 0; iTrack1 < nTracks; iTrack1++) {
462 track1 = (AliMUONTrack*) fRecTracksPtr->UncheckedAt(iTrack1);
464 if (!track1) continue;
465 nClusters1 = track1->GetNClusters();
466 // Loop over second track of the pair
467 for (Int_t iTrack2 = iTrack1+1; iTrack2 < nTracks; iTrack2++) {
468 track2 = (AliMUONTrack*) fRecTracksPtr->UncheckedAt(iTrack2);
470 if (!track2) continue;
471 nClusters2 = track2->GetNClusters();
472 // number of clusters in common between two tracks
473 clustersInCommon = track1->ClustersInCommon(track2);
474 // check for identical tracks
475 if ((clustersInCommon == nClusters1) || (clustersInCommon == nClusters2)) {
476 // decide which track to remove
477 if (nClusters2 > nClusters1) {
478 // remove track1 and continue the first loop with the track next to track1
479 fRecTracksPtr->RemoveAt(iTrack1);
483 // remove track2 and continue the second loop with the track next to track2
484 fRecTracksPtr->RemoveAt(iTrack2);
490 fRecTracksPtr->Compress(); // this is essential to retrieve the TClonesArray afterwards
493 //__________________________________________________________________________
494 void AliMUONVTrackReconstructor::RemoveDoubleTracks()
496 /// To remove double tracks:
497 /// Tracks are considered identical if more than half of the clusters of the track
498 /// which has the smaller number of clusters are in common with the other track.
499 /// Among two identical tracks, one keeps the track with the larger number of clusters
500 /// or, if these numbers are equal, the track with the minimum chi2.
501 AliMUONTrack *track1, *track2;
502 Int_t nTracks = fRecTracksPtr->GetEntriesFast();
503 Int_t clustersInCommon2, nClusters1, nClusters2;
504 // Loop over first track of the pair
505 for (Int_t iTrack1 = 0; iTrack1 < nTracks; iTrack1++) {
506 track1 = (AliMUONTrack*) fRecTracksPtr->UncheckedAt(iTrack1);
508 if (!track1) continue;
509 nClusters1 = track1->GetNClusters();
510 // Loop over second track of the pair
511 for (Int_t iTrack2 = iTrack1+1; iTrack2 < nTracks; iTrack2++) {
512 track2 = (AliMUONTrack*) fRecTracksPtr->UncheckedAt(iTrack2);
514 if (!track2) continue;
515 nClusters2 = track2->GetNClusters();
516 // number of clusters in common between two tracks
517 clustersInCommon2 = 2 * track1->ClustersInCommon(track2);
518 // check for identical tracks
519 if (clustersInCommon2 > nClusters1 || clustersInCommon2 > nClusters2) {
520 // decide which track to remove
521 if ((nClusters1 > nClusters2) || ((nClusters1 == nClusters2) && (track1->GetGlobalChi2() <= track2->GetGlobalChi2()))) {
522 // remove track2 and continue the second loop with the track next to track2
523 fRecTracksPtr->RemoveAt(iTrack2);
526 // else remove track1 and continue the first loop with the track next to track1
527 fRecTracksPtr->RemoveAt(iTrack1);
534 fRecTracksPtr->Compress(); // this is essential to retrieve the TClonesArray afterwards
537 //__________________________________________________________________________
538 void AliMUONVTrackReconstructor::RemoveConnectedTracks(Bool_t inSt345)
540 /// To remove double tracks:
541 /// Tracks are considered identical if they share 1 cluster or more.
542 /// If inSt345=kTRUE only stations 3, 4 and 5 are considered.
543 /// Among two identical tracks, one keeps the track with the larger number of clusters
544 /// or, if these numbers are equal, the track with the minimum chi2.
545 AliMUONTrack *track1, *track2, *trackToRemove;
546 Int_t clustersInCommon, nClusters1, nClusters2;
547 Bool_t removedTrack1;
548 // Loop over first track of the pair
549 track1 = (AliMUONTrack*) fRecTracksPtr->First();
551 removedTrack1 = kFALSE;
552 nClusters1 = track1->GetNClusters();
553 // Loop over second track of the pair
554 track2 = (AliMUONTrack*) fRecTracksPtr->After(track1);
556 nClusters2 = track2->GetNClusters();
557 // number of clusters in common between two tracks
558 if (inSt345) clustersInCommon = track1->ClustersInCommonInSt345(track2);
559 else clustersInCommon = track1->ClustersInCommon(track2);
560 // check for identical tracks
561 if (clustersInCommon > 0) {
562 // decide which track to remove
563 if ((nClusters1 > nClusters2) || ((nClusters1 == nClusters2) && (track1->GetGlobalChi2() <= track2->GetGlobalChi2()))) {
564 // remove track2 and continue the second loop with the track next to track2
565 trackToRemove = track2;
566 track2 = (AliMUONTrack*) fRecTracksPtr->After(track2);
567 fRecTracksPtr->Remove(trackToRemove);
568 fRecTracksPtr->Compress(); // this is essential to retrieve the TClonesArray afterwards
571 // else remove track1 and continue the first loop with the track next to track1
572 trackToRemove = track1;
573 track1 = (AliMUONTrack*) fRecTracksPtr->After(track1);
574 fRecTracksPtr->Remove(trackToRemove);
575 fRecTracksPtr->Compress(); // this is essential to retrieve the TClonesArray afterwards
577 removedTrack1 = kTRUE;
580 } else track2 = (AliMUONTrack*) fRecTracksPtr->After(track2);
582 if (removedTrack1) continue;
583 track1 = (AliMUONTrack*) fRecTracksPtr->After(track1);
588 //__________________________________________________________________________
589 void AliMUONVTrackReconstructor::AskForNewClustersInChamber(const AliMUONTrackParam &trackParam,
590 AliMUONVClusterStore& clusterStore, Int_t chamber)
592 /// Ask the clustering to reconstruct new clusters around the track candidate position
594 // check if the current chamber is useable
595 if (!fClusterServer || !GetRecoParam()->UseChamber(chamber)) return;
597 // maximum distance between the center of the chamber and a detection element
598 // (accounting for the inclination of the chamber)
599 static const Double_t kMaxDZ = 15.; // 15 cm
601 // extrapolate track parameters to the chamber
602 AliMUONTrackParam extrapTrackParam(trackParam);
603 if (!AliMUONTrackExtrap::ExtrapToZCov(&extrapTrackParam, AliMUONConstants::DefaultChamberZ(chamber))) return;
605 // build the searching area using the track and chamber resolutions and the maximum-distance-to-track value
606 const TMatrixD& kParamCov = extrapTrackParam.GetCovariances();
607 Double_t errX2 = kParamCov(0,0) + kMaxDZ * kMaxDZ * kParamCov(1,1) + 2. * kMaxDZ * TMath::Abs(kParamCov(0,1)) +
608 GetRecoParam()->GetDefaultNonBendingReso(chamber) * GetRecoParam()->GetDefaultNonBendingReso(chamber);
609 Double_t errY2 = kParamCov(2,2) + kMaxDZ * kMaxDZ * kParamCov(3,3) + 2. * kMaxDZ * TMath::Abs(kParamCov(2,3)) +
610 GetRecoParam()->GetDefaultBendingReso(chamber) * GetRecoParam()->GetDefaultBendingReso(chamber);
611 Double_t dX = TMath::Abs(trackParam.GetNonBendingSlope()) * kMaxDZ +
612 GetRecoParam()->GetMaxNonBendingDistanceToTrack() +
613 GetRecoParam()->GetSigmaCutForTracking() * TMath::Sqrt(2. * errX2);
614 Double_t dY = TMath::Abs(trackParam.GetBendingSlope()) * kMaxDZ +
615 GetRecoParam()->GetMaxBendingDistanceToTrack() +
616 GetRecoParam()->GetSigmaCutForTracking() * TMath::Sqrt(2. * errY2);
617 AliMpArea area(extrapTrackParam.GetNonBendingCoor(),
618 extrapTrackParam.GetBendingCoor(),
621 // ask to cluterize in the given area of the given chamber
622 fClusterServer->Clusterize(chamber, clusterStore, area, GetRecoParam());
626 //__________________________________________________________________________
627 void AliMUONVTrackReconstructor::AskForNewClustersInStation(const AliMUONTrackParam &trackParam,
628 AliMUONVClusterStore& clusterStore, Int_t station)
630 /// Ask the clustering to reconstruct new clusters around the track candidate position
631 /// in the 2 chambers of the given station
632 AskForNewClustersInChamber(trackParam, clusterStore, 2*station+1);
633 AskForNewClustersInChamber(trackParam, clusterStore, 2*station);
636 //__________________________________________________________________________
637 Double_t AliMUONVTrackReconstructor::TryOneCluster(const AliMUONTrackParam &trackParam, AliMUONVCluster* cluster,
638 AliMUONTrackParam &trackParamAtCluster, Bool_t updatePropagator)
640 /// Test the compatibility between the track and the cluster (using trackParam's covariance matrix):
641 /// return the corresponding Chi2
642 /// return trackParamAtCluster
644 // extrapolate track parameters and covariances at the z position of the tested cluster
645 // and set pointer to cluster into trackParamAtCluster
646 trackParamAtCluster = trackParam;
647 trackParamAtCluster.SetClusterPtr(cluster);
648 if (!AliMUONTrackExtrap::ExtrapToZCov(&trackParamAtCluster, cluster->GetZ(), updatePropagator))
649 return 2.*AliMUONTrack::MaxChi2();
651 // Set differences between trackParam and cluster in the bending and non bending directions
652 Double_t dX = cluster->GetX() - trackParamAtCluster.GetNonBendingCoor();
653 Double_t dY = cluster->GetY() - trackParamAtCluster.GetBendingCoor();
655 // Calculate errors and covariances
656 const TMatrixD& kParamCov = trackParamAtCluster.GetCovariances();
657 Double_t sigmaX2 = kParamCov(0,0) + cluster->GetErrX2();
658 Double_t sigmaY2 = kParamCov(2,2) + cluster->GetErrY2();
659 Double_t covXY = kParamCov(0,2);
660 Double_t det = sigmaX2 * sigmaY2 - covXY * covXY;
663 if (det == 0.) return 2.*AliMUONTrack::MaxChi2();
664 return (dX * dX * sigmaY2 + dY * dY * sigmaX2 - 2. * dX * dY * covXY) / det;
668 //__________________________________________________________________________
669 Bool_t AliMUONVTrackReconstructor::TryOneClusterFast(const AliMUONTrackParam &trackParam, const AliMUONVCluster* cluster)
671 /// Test the compatibility between the track and the cluster
672 /// given the track and cluster resolutions + the maximum-distance-to-track value
673 /// and assuming linear propagation of the track:
674 /// return kTRUE if they are compatibles
676 Double_t dZ = cluster->GetZ() - trackParam.GetZ();
677 Double_t dX = cluster->GetX() - (trackParam.GetNonBendingCoor() + trackParam.GetNonBendingSlope() * dZ);
678 Double_t dY = cluster->GetY() - (trackParam.GetBendingCoor() + trackParam.GetBendingSlope() * dZ);
679 const TMatrixD& kParamCov = trackParam.GetCovariances();
680 Double_t errX2 = kParamCov(0,0) + dZ * dZ * kParamCov(1,1) + 2. * dZ * kParamCov(0,1) + cluster->GetErrX2();
681 Double_t errY2 = kParamCov(2,2) + dZ * dZ * kParamCov(3,3) + 2. * dZ * kParamCov(2,3) + cluster->GetErrY2();
683 Double_t dXmax = GetRecoParam()->GetSigmaCutForTracking() * TMath::Sqrt(2. * errX2) +
684 GetRecoParam()->GetMaxNonBendingDistanceToTrack();
685 Double_t dYmax = GetRecoParam()->GetSigmaCutForTracking() * TMath::Sqrt(2. * errY2) +
686 GetRecoParam()->GetMaxBendingDistanceToTrack();
688 if (TMath::Abs(dX) > dXmax || TMath::Abs(dY) > dYmax) return kFALSE;
694 //__________________________________________________________________________
695 Double_t AliMUONVTrackReconstructor::TryTwoClustersFast(const AliMUONTrackParam &trackParamAtCluster1, AliMUONVCluster* cluster2,
696 AliMUONTrackParam &trackParamAtCluster2)
698 /// Test the compatibility between the track and the 2 clusters together (using trackParam's covariance matrix)
699 /// assuming linear propagation between the two clusters:
700 /// return the corresponding Chi2 accounting for covariances between the 2 clusters
701 /// return trackParamAtCluster2
703 // extrapolate linearly track parameters and covariances at the z position of the second cluster
704 trackParamAtCluster2 = trackParamAtCluster1;
705 AliMUONTrackExtrap::LinearExtrapToZCov(&trackParamAtCluster2, cluster2->GetZ());
707 // set pointer to cluster2 into trackParamAtCluster2
708 trackParamAtCluster2.SetClusterPtr(cluster2);
710 // Set differences between track and clusters in the bending and non bending directions
711 AliMUONVCluster* cluster1 = trackParamAtCluster1.GetClusterPtr();
712 Double_t dX1 = cluster1->GetX() - trackParamAtCluster1.GetNonBendingCoor();
713 Double_t dX2 = cluster2->GetX() - trackParamAtCluster2.GetNonBendingCoor();
714 Double_t dY1 = cluster1->GetY() - trackParamAtCluster1.GetBendingCoor();
715 Double_t dY2 = cluster2->GetY() - trackParamAtCluster2.GetBendingCoor();
717 // Calculate errors and covariances
718 const TMatrixD& kParamCov1 = trackParamAtCluster1.GetCovariances();
719 const TMatrixD& kParamCov2 = trackParamAtCluster2.GetCovariances();
720 Double_t dZ = trackParamAtCluster2.GetZ() - trackParamAtCluster1.GetZ();
721 Double_t sigma2X1 = kParamCov1(0,0) + cluster1->GetErrX2();
722 Double_t sigma2X2 = kParamCov2(0,0) + cluster2->GetErrX2();
723 Double_t covX1X2 = kParamCov1(0,0) + dZ * kParamCov1(0,1);
724 Double_t sigma2Y1 = kParamCov1(2,2) + cluster1->GetErrY2();
725 Double_t sigma2Y2 = kParamCov2(2,2) + cluster2->GetErrY2();
726 Double_t covY1Y2 = kParamCov1(2,2) + dZ * kParamCov1(2,3);
729 Double_t detX = sigma2X1 * sigma2X2 - covX1X2 * covX1X2;
730 Double_t detY = sigma2Y1 * sigma2Y2 - covY1Y2 * covY1Y2;
731 if (detX == 0. || detY == 0.) return 2.*AliMUONTrack::MaxChi2();
732 return (dX1 * dX1 * sigma2X2 + dX2 * dX2 * sigma2X1 - 2. * dX1 * dX2 * covX1X2) / detX
733 + (dY1 * dY1 * sigma2Y2 + dY2 * dY2 * sigma2Y1 - 2. * dY1 * dY2 * covY1Y2) / detY;
737 //__________________________________________________________________________
738 Bool_t AliMUONVTrackReconstructor::FollowLinearTrackInChamber(AliMUONTrack &trackCandidate, const AliMUONVClusterStore& clusterStore,
741 /// Follow trackCandidate in chamber(0..) nextChamber assuming linear propagation, and search for compatible cluster(s)
742 /// Keep all possibilities or only the best one(s) according to the flag fgkTrackAllTracks:
743 /// kTRUE: duplicate "trackCandidate" if there are several possibilities and add the new tracks at the end of
744 /// fRecTracksPtr to avoid conficts with other track candidates at this current stage of the tracking procedure.
745 /// Remove the obsolete "trackCandidate" at the end.
746 /// kFALSE: add only the best cluster(s) to the "trackCandidate". Try to add a couple of clusters in priority.
747 /// return kTRUE if new cluster(s) have been found (otherwise return kFALSE)
748 AliDebug(1,Form("Enter FollowLinearTrackInChamber(1..) %d", nextChamber+1));
750 Double_t chi2WithOneCluster = AliMUONTrack::MaxChi2();
751 Double_t maxChi2WithOneCluster = 2. * GetRecoParam()->GetSigmaCutForTracking() *
752 GetRecoParam()->GetSigmaCutForTracking(); // 2 because 2 quantities in chi2
753 Double_t bestChi2WithOneCluster = maxChi2WithOneCluster;
754 Bool_t foundOneCluster = kFALSE;
755 AliMUONTrack *newTrack = 0x0;
756 AliMUONVCluster *cluster;
757 AliMUONTrackParam trackParam;
758 AliMUONTrackParam extrapTrackParamAtCluster;
759 AliMUONTrackParam bestTrackParamAtCluster;
761 // Get track parameters according to the propagation direction
762 if (nextChamber > 7) trackParam = *(AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->Last();
763 else trackParam = *(AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->First();
765 // Printout for debuging
766 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 2) || (AliLog::GetGlobalDebugLevel() >= 2)) {
767 cout<<endl<<"Track parameters and covariances at first cluster:"<<endl;
768 trackParam.GetParameters().Print();
769 trackParam.GetCovariances().Print();
773 AliMUONTrackExtrap::AddMCSEffect(&trackParam,AliMUONConstants::ChamberThicknessInX0(trackParam.GetClusterPtr()->GetChamberId()),-1.);
775 // Printout for debuging
776 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
777 cout << "FollowLinearTrackInChamber: look for cluster in chamber(1..): " << nextChamber+1 << endl;
780 // Create iterators to loop over clusters in chamber
781 TIter next(clusterStore.CreateChamberIterator(nextChamber,nextChamber));
783 // look for candidates in chamber
784 while ( ( cluster = static_cast<AliMUONVCluster*>(next()) ) ) {
786 // try to add the current cluster fast
787 if (!TryOneClusterFast(trackParam, cluster)) continue;
789 // try to add the current cluster accuratly
790 extrapTrackParamAtCluster = trackParam;
791 AliMUONTrackExtrap::LinearExtrapToZCov(&extrapTrackParamAtCluster, cluster->GetZ());
792 chi2WithOneCluster = TryOneCluster(extrapTrackParamAtCluster, cluster, extrapTrackParamAtCluster);
794 // if good chi2 then consider to add cluster
795 if (chi2WithOneCluster < maxChi2WithOneCluster) {
796 foundOneCluster = kTRUE;
798 // Printout for debuging
799 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
800 cout << "FollowLinearTrackInChamber: found one cluster in chamber(1..): " << nextChamber+1
801 << " (Chi2 = " << chi2WithOneCluster << ")" << endl;
805 if (GetRecoParam()->TrackAllTracks()) {
806 // copy trackCandidate into a new track put at the end of fRecTracksPtr and add the new cluster
807 newTrack = new ((*fRecTracksPtr)[fRecTracksPtr->GetLast()+1]) AliMUONTrack(trackCandidate);
808 if (GetRecoParam()->RequestStation(nextChamber/2))
809 extrapTrackParamAtCluster.SetRemovable(kFALSE);
810 else extrapTrackParamAtCluster.SetRemovable(kTRUE);
811 newTrack->AddTrackParamAtCluster(extrapTrackParamAtCluster,*cluster);
812 newTrack->SetGlobalChi2(trackCandidate.GetGlobalChi2()+chi2WithOneCluster);
815 // Printout for debuging
816 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
817 cout << "FollowLinearTrackInChamber: added one cluster in chamber(1..): " << nextChamber+1 << endl;
818 if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump();
821 } else if (chi2WithOneCluster < bestChi2WithOneCluster) {
822 // keep track of the best cluster
823 bestChi2WithOneCluster = chi2WithOneCluster;
824 bestTrackParamAtCluster = extrapTrackParamAtCluster;
831 // fill out the best track if required else clean up the fRecTracksPtr array
832 if (!GetRecoParam()->TrackAllTracks()) {
833 if (foundOneCluster) {
834 if (GetRecoParam()->RequestStation(nextChamber/2))
835 bestTrackParamAtCluster.SetRemovable(kFALSE);
836 else bestTrackParamAtCluster.SetRemovable(kTRUE);
837 trackCandidate.AddTrackParamAtCluster(bestTrackParamAtCluster,*(bestTrackParamAtCluster.GetClusterPtr()));
838 trackCandidate.SetGlobalChi2(trackCandidate.GetGlobalChi2()+bestChi2WithOneCluster);
840 // Printout for debuging
841 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
842 cout << "FollowLinearTrackInChamber: added the best cluster in chamber(1..): " << bestTrackParamAtCluster.GetClusterPtr()->GetChamberId()+1 << endl;
843 if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump();
846 } else return kFALSE;
848 } else if (foundOneCluster) {
850 // remove obsolete track
851 fRecTracksPtr->Remove(&trackCandidate);
854 } else return kFALSE;
860 //__________________________________________________________________________
861 Bool_t AliMUONVTrackReconstructor::FollowLinearTrackInStation(AliMUONTrack &trackCandidate, const AliMUONVClusterStore& clusterStore,
864 /// Follow trackCandidate in station(0..) nextStation assuming linear propagation, and search for compatible cluster(s)
865 /// Keep all possibilities or only the best one(s) according to the flag fgkTrackAllTracks:
866 /// kTRUE: duplicate "trackCandidate" if there are several possibilities and add the new tracks at the end of
867 /// fRecTracksPtr to avoid conficts with other track candidates at this current stage of the tracking procedure.
868 /// Remove the obsolete "trackCandidate" at the end.
869 /// kFALSE: add only the best cluster(s) to the "trackCandidate". Try to add a couple of clusters in priority.
870 /// return kTRUE if new cluster(s) have been found (otherwise return kFALSE)
871 AliDebug(1,Form("Enter FollowLinearTrackInStation(1..) %d", nextStation+1));
873 // Order the chamber according to the propagation direction (tracking starts with chamber 2):
874 // - nextStation == station(1...) 5 => forward propagation
875 // - nextStation < station(1...) 5 => backward propagation
877 if (nextStation==4) {
878 ch1 = 2*nextStation+1;
882 ch2 = 2*nextStation+1;
885 Double_t chi2WithOneCluster = AliMUONTrack::MaxChi2();
886 Double_t chi2WithTwoClusters = AliMUONTrack::MaxChi2();
887 Double_t maxChi2WithOneCluster = 2. * GetRecoParam()->GetSigmaCutForTracking() *
888 GetRecoParam()->GetSigmaCutForTracking(); // 2 because 2 quantities in chi2
889 Double_t maxChi2WithTwoClusters = 4. * GetRecoParam()->GetSigmaCutForTracking() *
890 GetRecoParam()->GetSigmaCutForTracking(); // 4 because 4 quantities in chi2
891 Double_t bestChi2WithOneCluster = maxChi2WithOneCluster;
892 Double_t bestChi2WithTwoClusters = maxChi2WithTwoClusters;
893 Bool_t foundOneCluster = kFALSE;
894 Bool_t foundTwoClusters = kFALSE;
895 AliMUONTrack *newTrack = 0x0;
896 AliMUONVCluster *clusterCh1, *clusterCh2;
897 AliMUONTrackParam trackParam;
898 AliMUONTrackParam extrapTrackParamAtCluster1;
899 AliMUONTrackParam extrapTrackParamAtCluster2;
900 AliMUONTrackParam bestTrackParamAtCluster1;
901 AliMUONTrackParam bestTrackParamAtCluster2;
903 Int_t nClusters = clusterStore.GetSize();
904 Bool_t *clusterCh1Used = new Bool_t[nClusters];
905 for (Int_t i = 0; i < nClusters; i++) clusterCh1Used[i] = kFALSE;
908 // Get track parameters according to the propagation direction
909 if (nextStation==4) trackParam = *(AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->Last();
910 else trackParam = *(AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->First();
912 // Printout for debuging
913 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 2) || (AliLog::GetGlobalDebugLevel() >= 2)) {
914 cout<<endl<<"Track parameters and covariances at first cluster:"<<endl;
915 trackParam.GetParameters().Print();
916 trackParam.GetCovariances().Print();
920 AliMUONTrackExtrap::AddMCSEffect(&trackParam,AliMUONConstants::ChamberThicknessInX0(trackParam.GetClusterPtr()->GetChamberId()),-1.);
922 // Printout for debuging
923 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
924 cout << "FollowLinearTrackInStation: look for clusters in chamber(1..): " << ch2+1 << endl;
927 // Create iterators to loop over clusters in both chambers
928 TIter nextInCh1(clusterStore.CreateChamberIterator(ch1,ch1));
929 TIter nextInCh2(clusterStore.CreateChamberIterator(ch2,ch2));
931 // look for candidates in chamber 2
932 while ( ( clusterCh2 = static_cast<AliMUONVCluster*>(nextInCh2()) ) ) {
934 // try to add the current cluster fast
935 if (!TryOneClusterFast(trackParam, clusterCh2)) continue;
937 // try to add the current cluster accuratly
938 extrapTrackParamAtCluster2 = trackParam;
939 AliMUONTrackExtrap::LinearExtrapToZCov(&extrapTrackParamAtCluster2, clusterCh2->GetZ());
940 chi2WithOneCluster = TryOneCluster(extrapTrackParamAtCluster2, clusterCh2, extrapTrackParamAtCluster2);
942 // if good chi2 then try to attach a cluster in the other chamber too
943 if (chi2WithOneCluster < maxChi2WithOneCluster) {
944 Bool_t foundSecondCluster = kFALSE;
946 // Printout for debuging
947 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
948 cout << "FollowLinearTrackInStation: found one cluster in chamber(1..): " << ch2+1
949 << " (Chi2 = " << chi2WithOneCluster << ")" << endl;
951 cout << " look for second clusters in chamber(1..): " << ch1+1 << " ..." << endl;
955 AliMUONTrackExtrap::AddMCSEffect(&extrapTrackParamAtCluster2,AliMUONConstants::ChamberThicknessInX0(ch2),-1.);
957 // reset cluster iterator of chamber 1
961 // look for second candidates in chamber 1
962 while ( ( clusterCh1 = static_cast<AliMUONVCluster*>(nextInCh1()) ) ) {
965 // try to add the current cluster fast
966 if (!TryOneClusterFast(extrapTrackParamAtCluster2, clusterCh1)) continue;
968 // try to add the current cluster in addition to the one found in the previous chamber
969 chi2WithTwoClusters = TryTwoClustersFast(extrapTrackParamAtCluster2, clusterCh1, extrapTrackParamAtCluster1);
971 // if good chi2 then consider to add the 2 clusters to the "trackCandidate"
972 if (chi2WithTwoClusters < maxChi2WithTwoClusters) {
973 foundSecondCluster = kTRUE;
974 foundTwoClusters = kTRUE;
976 // Printout for debuging
977 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
978 cout << "FollowLinearTrackInStation: found one cluster in chamber(1..): " << ch1+1
979 << " (Chi2 = " << chi2WithTwoClusters << ")" << endl;
983 if (GetRecoParam()->TrackAllTracks()) {
984 // copy trackCandidate into a new track put at the end of fRecTracksPtr and add the new clusters
985 newTrack = new ((*fRecTracksPtr)[fRecTracksPtr->GetLast()+1]) AliMUONTrack(trackCandidate);
986 extrapTrackParamAtCluster1.SetRemovable(kTRUE);
987 newTrack->AddTrackParamAtCluster(extrapTrackParamAtCluster1,*clusterCh1);
988 extrapTrackParamAtCluster2.SetRemovable(kTRUE);
989 newTrack->AddTrackParamAtCluster(extrapTrackParamAtCluster2,*clusterCh2);
990 newTrack->SetGlobalChi2(newTrack->GetGlobalChi2()+chi2WithTwoClusters);
993 // Tag clusterCh1 as used
994 clusterCh1Used[iCluster1] = kTRUE;
996 // Printout for debuging
997 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
998 cout << "FollowLinearTrackInStation: added two clusters in station(1..): " << nextStation+1 << endl;
999 if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump();
1002 } else if (chi2WithTwoClusters < bestChi2WithTwoClusters) {
1003 // keep track of the best couple of clusters
1004 bestChi2WithTwoClusters = chi2WithTwoClusters;
1005 bestTrackParamAtCluster1 = extrapTrackParamAtCluster1;
1006 bestTrackParamAtCluster2 = extrapTrackParamAtCluster2;
1013 // if no cluster found in chamber1 then consider to add clusterCh2 only
1014 if (!foundSecondCluster) {
1015 foundOneCluster = kTRUE;
1017 if (GetRecoParam()->TrackAllTracks()) {
1018 // copy trackCandidate into a new track put at the end of fRecTracksPtr and add the new cluster
1019 newTrack = new ((*fRecTracksPtr)[fRecTracksPtr->GetLast()+1]) AliMUONTrack(trackCandidate);
1020 if (GetRecoParam()->RequestStation(nextStation))
1021 extrapTrackParamAtCluster2.SetRemovable(kFALSE);
1022 else extrapTrackParamAtCluster2.SetRemovable(kTRUE);
1023 newTrack->AddTrackParamAtCluster(extrapTrackParamAtCluster2,*clusterCh2);
1024 newTrack->SetGlobalChi2(newTrack->GetGlobalChi2()+chi2WithOneCluster);
1027 // Printout for debuging
1028 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
1029 cout << "FollowLinearTrackInStation: added one cluster in chamber(1..): " << ch2+1 << endl;
1030 if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump();
1033 } else if (!foundTwoClusters && chi2WithOneCluster < bestChi2WithOneCluster) {
1034 // keep track of the best cluster except if a couple of clusters has already been found
1035 bestChi2WithOneCluster = chi2WithOneCluster;
1036 bestTrackParamAtCluster1 = extrapTrackParamAtCluster2;
1045 // look for candidates in chamber 1 not already attached to a track
1046 // if we want to keep all possible tracks or if no good couple of clusters has been found
1047 if (GetRecoParam()->TrackAllTracks() || !foundTwoClusters) {
1049 // Printout for debuging
1050 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
1051 cout << "FollowLinearTrackInStation: look for single cluster in chamber(1..): " << ch1+1 << endl;
1054 //Extrapolate trackCandidate to chamber "ch2"
1055 AliMUONTrackExtrap::LinearExtrapToZCov(&trackParam, AliMUONConstants::DefaultChamberZ(ch2));
1057 // add MCS effect for next step
1058 AliMUONTrackExtrap::AddMCSEffect(&trackParam,AliMUONConstants::ChamberThicknessInX0(ch2),-1.);
1060 // reset cluster iterator of chamber 1
1064 // look for second candidates in chamber 1
1065 while ( ( clusterCh1 = static_cast<AliMUONVCluster*>(nextInCh1()) ) ) {
1068 if (clusterCh1Used[iCluster1]) continue; // Skip clusters already used
1070 // try to add the current cluster fast
1071 if (!TryOneClusterFast(trackParam, clusterCh1)) continue;
1073 // try to add the current cluster accuratly
1074 extrapTrackParamAtCluster1 = trackParam;
1075 AliMUONTrackExtrap::LinearExtrapToZCov(&extrapTrackParamAtCluster1, clusterCh1->GetZ());
1076 chi2WithOneCluster = TryOneCluster(extrapTrackParamAtCluster1, clusterCh1, extrapTrackParamAtCluster1);
1078 // if good chi2 then consider to add clusterCh1
1079 // We do not try to attach a cluster in the other chamber too since it has already been done above
1080 if (chi2WithOneCluster < maxChi2WithOneCluster) {
1081 foundOneCluster = kTRUE;
1083 // Printout for debuging
1084 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
1085 cout << "FollowLinearTrackInStation: found one cluster in chamber(1..): " << ch1+1
1086 << " (Chi2 = " << chi2WithOneCluster << ")" << endl;
1087 clusterCh1->Print();
1090 if (GetRecoParam()->TrackAllTracks()) {
1091 // copy trackCandidate into a new track put at the end of fRecTracksPtr and add the new cluster
1092 newTrack = new ((*fRecTracksPtr)[fRecTracksPtr->GetLast()+1]) AliMUONTrack(trackCandidate);
1093 if (GetRecoParam()->RequestStation(nextStation))
1094 extrapTrackParamAtCluster1.SetRemovable(kFALSE);
1095 else extrapTrackParamAtCluster1.SetRemovable(kTRUE);
1096 newTrack->AddTrackParamAtCluster(extrapTrackParamAtCluster1,*clusterCh1);
1097 newTrack->SetGlobalChi2(newTrack->GetGlobalChi2()+chi2WithOneCluster);
1100 // Printout for debuging
1101 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
1102 cout << "FollowLinearTrackInStation: added one cluster in chamber(1..): " << ch1+1 << endl;
1103 if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump();
1106 } else if (chi2WithOneCluster < bestChi2WithOneCluster) {
1107 // keep track of the best cluster except if a couple of clusters has already been found
1108 bestChi2WithOneCluster = chi2WithOneCluster;
1109 bestTrackParamAtCluster1 = extrapTrackParamAtCluster1;
1118 // fill out the best track if required else clean up the fRecTracksPtr array
1119 if (!GetRecoParam()->TrackAllTracks()) {
1120 if (foundTwoClusters) {
1121 bestTrackParamAtCluster1.SetRemovable(kTRUE);
1122 trackCandidate.AddTrackParamAtCluster(bestTrackParamAtCluster1,*(bestTrackParamAtCluster1.GetClusterPtr()));
1123 bestTrackParamAtCluster2.SetRemovable(kTRUE);
1124 trackCandidate.AddTrackParamAtCluster(bestTrackParamAtCluster2,*(bestTrackParamAtCluster2.GetClusterPtr()));
1125 trackCandidate.SetGlobalChi2(trackCandidate.GetGlobalChi2()+bestChi2WithTwoClusters);
1127 // Printout for debuging
1128 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
1129 cout << "FollowLinearTrackInStation: added the two best clusters in station(1..): " << nextStation+1 << endl;
1130 if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump();
1133 } else if (foundOneCluster) {
1134 if (GetRecoParam()->RequestStation(nextStation))
1135 bestTrackParamAtCluster1.SetRemovable(kFALSE);
1136 else bestTrackParamAtCluster1.SetRemovable(kTRUE);
1137 trackCandidate.AddTrackParamAtCluster(bestTrackParamAtCluster1,*(bestTrackParamAtCluster1.GetClusterPtr()));
1138 trackCandidate.SetGlobalChi2(trackCandidate.GetGlobalChi2()+bestChi2WithOneCluster);
1140 // Printout for debuging
1141 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
1142 cout << "FollowLinearTrackInStation: added the best cluster in chamber(1..): " << bestTrackParamAtCluster1.GetClusterPtr()->GetChamberId()+1 << endl;
1143 if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump();
1147 delete [] clusterCh1Used;
1151 } else if (foundOneCluster || foundTwoClusters) {
1153 // remove obsolete track
1154 fRecTracksPtr->Remove(&trackCandidate);
1158 delete [] clusterCh1Used;
1162 delete [] clusterCh1Used;
1167 //__________________________________________________________________________
1168 void AliMUONVTrackReconstructor::ImproveTracks()
1170 /// Improve tracks by removing clusters with local chi2 highter than the defined cut
1171 /// Recompute track parameters and covariances at the remaining clusters
1172 AliDebug(1,"Enter ImproveTracks");
1174 AliMUONTrack *track, *nextTrack;
1176 track = (AliMUONTrack*) fRecTracksPtr->First();
1179 // prepare next track in case the actual track is suppressed
1180 nextTrack = (AliMUONTrack*) fRecTracksPtr->After(track);
1182 ImproveTrack(*track);
1184 // remove track if improvement failed
1185 if (!track->IsImproved()) {
1186 fRecTracksPtr->Remove(track);
1193 // compress the array in case of some tracks have been removed
1194 fRecTracksPtr->Compress();
1198 //__________________________________________________________________________
1199 void AliMUONVTrackReconstructor::Finalize()
1201 /// Recompute track parameters and covariances at each attached cluster from those at the first one
1202 /// Set the label pointing to the corresponding MC track
1203 /// Remove the track if finalization failed
1205 AliMUONTrack *track, *nextTrack;
1206 Bool_t trackRemoved = kFALSE;
1208 track = (AliMUONTrack*) fRecTracksPtr->First();
1211 nextTrack = (AliMUONTrack*) fRecTracksPtr->After(track);
1213 if (FinalizeTrack(*track)) track->FindMCLabel();
1215 fRecTracksPtr->Remove(track);
1217 trackRemoved = kTRUE;
1224 // compress array of tracks if needed
1225 if (trackRemoved) fRecTracksPtr->Compress();
1229 //__________________________________________________________________________
1230 void AliMUONVTrackReconstructor::ValidateTracksWithTrigger(AliMUONVTrackStore& trackStore,
1231 const AliMUONVTriggerTrackStore& triggerTrackStore,
1232 const AliMUONVTriggerStore& triggerStore,
1233 const AliMUONTrackHitPattern& trackHitPattern)
1235 /// Try to match track from tracking system with trigger track
1236 AliCodeTimerAuto("",0);
1238 trackHitPattern.ExecuteValidation(trackStore, triggerTrackStore, triggerStore);
1241 //__________________________________________________________________________
1242 void AliMUONVTrackReconstructor::EventReconstructTrigger(const AliMUONTriggerCircuit& circuit,
1243 const AliMUONVTriggerStore& triggerStore,
1244 AliMUONVTriggerTrackStore& triggerTrackStore)
1246 /// To make the trigger tracks from Local Trigger
1248 AliCodeTimerAuto("",0);
1250 AliMUONGlobalTrigger* globalTrigger = triggerStore.Global();
1252 UChar_t gloTrigPat = 0;
1256 gloTrigPat = globalTrigger->GetGlobalResponse();
1259 TIter next(triggerStore.CreateIterator());
1260 AliMUONLocalTrigger* locTrg(0x0);
1262 const Double_t kTrigNonBendReso = AliMUONConstants::TriggerNonBendingReso();
1263 const Double_t kTrigBendReso = AliMUONConstants::TriggerBendingReso();
1264 const Double_t kSqrt12 = TMath::Sqrt(12.);
1266 AliMUONTriggerTrack triggerTrack;
1267 TMatrixD trigCov(3,3);
1269 while ( ( locTrg = static_cast<AliMUONLocalTrigger*>(next()) ) )
1271 if ( locTrg->IsTrigX() && locTrg->IsTrigY() )
1272 { // make Trigger Track if trigger in X and Y
1274 Int_t localBoardId = locTrg->LoCircuit();
1276 Float_t y11 = circuit.GetY11Pos(localBoardId, locTrg->LoStripX());
1277 Float_t z11 = circuit.GetZ11Pos(localBoardId, locTrg->LoStripX());
1278 // need first to convert deviation to [0-30]
1279 // (see AliMUONLocalTriggerBoard::LocalTrigger)
1280 Int_t deviation = locTrg->GetDeviation();
1281 Int_t stripX21 = locTrg->LoStripX()+deviation+1;
1282 Float_t y21 = circuit.GetY21Pos(localBoardId, stripX21);
1283 Float_t z21 = circuit.GetZ21Pos(localBoardId, stripX21);
1284 Float_t x11 = circuit.GetX11Pos(localBoardId, locTrg->LoStripY());
1286 AliDebug(1, Form(" MakeTriggerTrack %3d %2d %2d %2d (%f %f %f) (%f %f)\n",locTrg->LoCircuit(),
1287 locTrg->LoStripX(),locTrg->LoStripX()+deviation+1,locTrg->LoStripY(),x11, y11, z11, y21, z21));
1290 Double_t deltaZ = z11 - z21;
1292 Float_t slopeX = x11/z11;
1293 Float_t slopeY = (y11-y21) / deltaZ;
1295 Float_t sigmaX = circuit.GetX11Width(localBoardId, locTrg->LoStripY()) / kSqrt12;
1296 Float_t sigmaY = circuit.GetY11Width(localBoardId, locTrg->LoStripX()) / kSqrt12;
1297 Float_t sigmaY21 = circuit.GetY21Width(localBoardId, locTrg->LoStripX()) / kSqrt12;
1300 trigCov(0,0) = kTrigNonBendReso * kTrigNonBendReso + sigmaX * sigmaX;
1301 trigCov(1,1) = kTrigBendReso * kTrigBendReso + sigmaY * sigmaY;
1303 (2. * kTrigBendReso * kTrigBendReso + sigmaY * sigmaY + sigmaY21 * sigmaY21 ) / deltaZ / deltaZ;
1304 trigCov(1,2) = trigCov(2,1) = trigCov(1,1) / deltaZ;
1306 triggerTrack.SetX11(x11);
1307 triggerTrack.SetY11(y11);
1308 triggerTrack.SetZ11(z11);
1309 triggerTrack.SetZ21(z21);
1310 triggerTrack.SetSlopeX(slopeX);
1311 triggerTrack.SetSlopeY(slopeY);
1312 triggerTrack.SetGTPattern(gloTrigPat);
1313 triggerTrack.SetLoTrgNum(localBoardId);
1314 triggerTrack.SetCovariances(trigCov);
1316 triggerTrackStore.Add(triggerTrack);
1318 } // end of loop on Local Trigger