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 RemoveConnectedTracks(3, 4, kFALSE);
181 RemoveConnectedTracks(2, 2, kFALSE);
182 if (GetRecoParam()->RemoveConnectedTracksInSt12()) RemoveConnectedTracks(0, 1, kFALSE);
184 // Fill AliMUONTrack data members
186 if (!GetRecoParam()->RemoveConnectedTracksInSt12()) TagConnectedTracks(0, 1, kTRUE);
188 // Add tracks to MUON data container
189 for (Int_t i=0; i<fNRecTracks; ++i)
191 AliMUONTrack * track = (AliMUONTrack*) fRecTracksPtr->At(i);
192 if (track->GetGlobalChi2() < AliMUONTrack::MaxChi2()) {
193 track->SetUniqueID(i+1);
194 trackStore.Add(*track);
195 } else AliWarning("problem occur somewhere during track refitting --> discard track");
199 //__________________________________________________________________________
200 Bool_t AliMUONVTrackReconstructor::IsAcceptable(AliMUONTrackParam &trackParam)
202 /// Return kTRUE if the track is within given limits on momentum/angle/origin
204 const TMatrixD& kParamCov = trackParam.GetCovariances();
205 Int_t chamber = trackParam.GetClusterPtr()->GetChamberId();
206 Double_t z = trackParam.GetZ();
207 Double_t sigmaCut = GetRecoParam()->GetSigmaCutForTracking();
210 Double_t angleMCS2 = 0.;
211 Double_t impactMCS2 = 0.;
212 if (AliMUONTrackExtrap::IsFieldON() && chamber < 6) {
214 // track momentum is known
215 for (Int_t iCh=0; iCh<=chamber; iCh++) {
216 Double_t localMCS2 = AliMUONTrackExtrap::GetMCSAngle2(trackParam, AliMUONConstants::ChamberThicknessInX0(iCh), 1.);
217 angleMCS2 += localMCS2;
218 impactMCS2 += AliMUONConstants::DefaultChamberZ(chamber) * AliMUONConstants::DefaultChamberZ(chamber) * localMCS2;
223 // track momentum is unknown
224 for (Int_t iCh=0; iCh<=chamber; iCh++) {
225 angleMCS2 += fMaxMCSAngle2[iCh];
226 impactMCS2 += AliMUONConstants::DefaultChamberZ(chamber) * AliMUONConstants::DefaultChamberZ(chamber) * fMaxMCSAngle2[iCh];
231 // ------ track selection in non bending direction ------
232 if (GetRecoParam()->SelectOnTrackSlope()) {
234 // check if non bending slope is within tolerances
235 Double_t nonBendingSlopeErr = TMath::Sqrt(kParamCov(1,1) + angleMCS2);
236 if ((TMath::Abs(trackParam.GetNonBendingSlope()) - sigmaCut * nonBendingSlopeErr) > GetRecoParam()->GetMaxNonBendingSlope()) return kFALSE;
240 // or check if non bending impact parameter is within tolerances
241 Double_t nonBendingImpactParam = TMath::Abs(trackParam.GetNonBendingCoor() - z * trackParam.GetNonBendingSlope());
242 Double_t nonBendingImpactParamErr = TMath::Sqrt(kParamCov(0,0) + z * z * kParamCov(1,1) - 2. * z * kParamCov(0,1) + impactMCS2);
243 if ((nonBendingImpactParam - sigmaCut * nonBendingImpactParamErr) > (3. * GetRecoParam()->GetNonBendingVertexDispersion())) return kFALSE;
247 // ------ track selection in bending direction ------
248 if (AliMUONTrackExtrap::IsFieldON()) { // depending whether the field is ON or OFF
250 // check if bending momentum is within tolerances
251 Double_t bendingMomentum = TMath::Abs(1. / trackParam.GetInverseBendingMomentum());
252 Double_t bendingMomentumErr = TMath::Sqrt(kParamCov(4,4)) * bendingMomentum * bendingMomentum;
253 if (chamber < 6 && (bendingMomentum + sigmaCut * bendingMomentumErr) < GetRecoParam()->GetMinBendingMomentum()) return kFALSE;
254 else if ((bendingMomentum + 3. * bendingMomentumErr) < GetRecoParam()->GetMinBendingMomentum()) return kFALSE;
258 if (GetRecoParam()->SelectOnTrackSlope()) {
260 // check if bending slope is within tolerances
261 Double_t bendingSlopeErr = TMath::Sqrt(kParamCov(3,3) + angleMCS2);
262 if ((TMath::Abs(trackParam.GetBendingSlope()) - sigmaCut * bendingSlopeErr) > GetRecoParam()->GetMaxBendingSlope()) return kFALSE;
266 // or check if bending impact parameter is within tolerances
267 Double_t bendingImpactParam = TMath::Abs(trackParam.GetBendingCoor() - z * trackParam.GetBendingSlope());
268 Double_t bendingImpactParamErr = TMath::Sqrt(kParamCov(2,2) + z * z * kParamCov(3,3) - 2. * z * kParamCov(2,3) + impactMCS2);
269 if ((bendingImpactParam - sigmaCut * bendingImpactParamErr) > (3. * GetRecoParam()->GetBendingVertexDispersion())) return kFALSE;
279 //__________________________________________________________________________
280 TClonesArray* AliMUONVTrackReconstructor::MakeSegmentsBetweenChambers(const AliMUONVClusterStore& clusterStore, Int_t ch1, Int_t ch2)
282 /// To make the list of segments from the list of clusters in the 2 given chambers.
283 /// Return a new TClonesArray of segments.
284 /// It is the responsibility of the user to delete it afterward.
285 AliDebug(1,Form("Enter MakeSegmentsBetweenChambers (1..) %d-%d", ch1+1, ch2+1));
286 AliCodeTimerAuto("",0);
288 AliMUONVCluster *cluster1, *cluster2;
289 AliMUONObjectPair *segment;
290 Double_t z1 = 0., z2 = 0., dZ = 0.;
291 Double_t nonBendingSlope = 0., nonBendingSlopeErr = 0., nonBendingImpactParam = 0., nonBendingImpactParamErr = 0.;
292 Double_t bendingSlope = 0., bendingSlopeErr = 0., bendingImpactParam = 0., bendingImpactParamErr = 0., bendingImpactParamErr2 = 0.;
293 Double_t bendingMomentum = 0., bendingMomentumErr = 0.;
294 Double_t bendingVertexDispersion2 = GetRecoParam()->GetBendingVertexDispersion() * GetRecoParam()->GetBendingVertexDispersion();
295 Double_t angleMCS2 = 0.; // maximum angular dispersion**2 due to MCS in chamber
296 Double_t impactMCS2 = 0.; // maximum impact parameter dispersion**2 due to MCS in chamber
297 for (Int_t iCh=0; iCh<=ch1; iCh++) {
298 angleMCS2 += fMaxMCSAngle2[iCh];
299 impactMCS2 += AliMUONConstants::DefaultChamberZ(iCh) * AliMUONConstants::DefaultChamberZ(iCh) * fMaxMCSAngle2[iCh];
301 Double_t sigmaCut = GetRecoParam()->GetSigmaCutForTracking();
303 // Create iterators to loop over clusters in both chambers
304 TIter nextInCh1(clusterStore.CreateChamberIterator(ch1,ch1));
305 TIter nextInCh2(clusterStore.CreateChamberIterator(ch2,ch2));
308 TClonesArray *segments = new TClonesArray("AliMUONObjectPair", 100);
310 // Loop over clusters in the first chamber of the station
311 while ( ( cluster1 = static_cast<AliMUONVCluster*>(nextInCh1()) ) ) {
312 z1 = cluster1->GetZ();
314 // reset cluster iterator of chamber 2
317 // Loop over clusters in the second chamber of the station
318 while ( ( cluster2 = static_cast<AliMUONVCluster*>(nextInCh2()) ) ) {
319 z2 = cluster2->GetZ();
322 // ------ track selection in non bending direction ------
323 nonBendingSlope = (cluster1->GetX() - cluster2->GetX()) / dZ;
324 if (GetRecoParam()->SelectOnTrackSlope()) {
326 // check if non bending slope is within tolerances
327 nonBendingSlopeErr = TMath::Sqrt((cluster1->GetErrX2() + cluster2->GetErrX2()) / dZ / dZ + angleMCS2);
328 if ((TMath::Abs(nonBendingSlope) - sigmaCut * nonBendingSlopeErr) > GetRecoParam()->GetMaxNonBendingSlope()) continue;
332 // or check if non bending impact parameter is within tolerances
333 nonBendingImpactParam = TMath::Abs(cluster1->GetX() - cluster1->GetZ() * nonBendingSlope);
334 nonBendingImpactParamErr = TMath::Sqrt((z1 * z1 * cluster2->GetErrX2() + z2 * z2 * cluster1->GetErrX2()) / dZ / dZ + impactMCS2);
335 if ((nonBendingImpactParam - sigmaCut * nonBendingImpactParamErr) > (3. * GetRecoParam()->GetNonBendingVertexDispersion())) continue;
339 // ------ track selection in bending direction ------
340 bendingSlope = (cluster1->GetY() - cluster2->GetY()) / dZ;
341 if (AliMUONTrackExtrap::IsFieldON()) { // depending whether the field is ON or OFF
343 // check if bending momentum is within tolerances
344 bendingImpactParam = cluster1->GetY() - cluster1->GetZ() * bendingSlope;
345 bendingImpactParamErr2 = (z1 * z1 * cluster2->GetErrY2() + z2 * z2 * cluster1->GetErrY2()) / dZ / dZ + impactMCS2;
346 bendingMomentum = TMath::Abs(AliMUONTrackExtrap::GetBendingMomentumFromImpactParam(bendingImpactParam));
347 bendingMomentumErr = TMath::Sqrt((bendingVertexDispersion2 + bendingImpactParamErr2) /
348 bendingImpactParam / bendingImpactParam + 0.01) * bendingMomentum;
349 if ((bendingMomentum + 3. * bendingMomentumErr) < GetRecoParam()->GetMinBendingMomentum()) continue;
353 if (GetRecoParam()->SelectOnTrackSlope()) {
355 // check if bending slope is within tolerances
356 bendingSlopeErr = TMath::Sqrt((cluster1->GetErrY2() + cluster2->GetErrY2()) / dZ / dZ + angleMCS2);
357 if ((TMath::Abs(bendingSlope) - sigmaCut * bendingSlopeErr) > GetRecoParam()->GetMaxBendingSlope()) continue;
361 // or check if bending impact parameter is within tolerances
362 bendingImpactParam = TMath::Abs(cluster1->GetY() - cluster1->GetZ() * bendingSlope);
363 bendingImpactParamErr = TMath::Sqrt((z1 * z1 * cluster2->GetErrY2() + z2 * z2 * cluster1->GetErrY2()) / dZ / dZ + impactMCS2);
364 if ((bendingImpactParam - sigmaCut * bendingImpactParamErr) > (3. * GetRecoParam()->GetBendingVertexDispersion())) continue;
371 segment = new ((*segments)[segments->GetLast()+1]) AliMUONObjectPair(cluster1, cluster2, kFALSE, kFALSE);
373 // Printout for debug
374 if (AliLog::GetGlobalDebugLevel() > 1) {
375 cout << "segmentIndex(0...): " << segments->GetLast() << endl;
377 cout << "Cluster in first chamber" << endl;
379 cout << "Cluster in second chamber" << endl;
387 // Printout for debug
388 AliDebug(1,Form("chambers%d-%d: NSegments = %d ", ch1+1, ch2+1, segments->GetEntriesFast()));
393 //__________________________________________________________________________
394 void AliMUONVTrackReconstructor::RemoveUsedSegments(TClonesArray& segments)
396 /// To remove pairs of clusters already attached to a track
397 AliDebug(1,"Enter RemoveUsedSegments");
398 Int_t nSegments = segments.GetEntriesFast();
399 Int_t nTracks = fRecTracksPtr->GetEntriesFast();
400 AliMUONObjectPair *segment;
402 AliMUONVCluster *cluster, *cluster1, *cluster2;
403 Bool_t foundCluster1, foundCluster2, removeSegment;
405 // Loop over segments
406 for (Int_t iSegment=0; iSegment<nSegments; iSegment++) {
407 segment = (AliMUONObjectPair*) segments.UncheckedAt(iSegment);
409 cluster1 = (AliMUONVCluster*) segment->First();
410 cluster2 = (AliMUONVCluster*) segment->Second();
411 removeSegment = kFALSE;
414 for (Int_t iTrack = 0; iTrack < nTracks; iTrack++) {
415 track = (AliMUONTrack*) fRecTracksPtr->UncheckedAt(iTrack);
418 if (!track) continue;
420 foundCluster1 = kFALSE;
421 foundCluster2 = kFALSE;
423 // Loop over clusters
424 Int_t nClusters = track->GetNClusters();
425 for (Int_t iCluster = 0; iCluster < nClusters; iCluster++) {
426 cluster = ((AliMUONTrackParam*) track->GetTrackParamAtCluster()->UncheckedAt(iCluster))->GetClusterPtr();
428 // check if both clusters are in that track
429 if (cluster == cluster1) foundCluster1 = kTRUE;
430 else if (cluster == cluster2) foundCluster2 = kTRUE;
432 if (foundCluster1 && foundCluster2) {
433 removeSegment = kTRUE;
439 if (removeSegment) break;
443 if (removeSegment) segments.RemoveAt(iSegment);
449 // Printout for debug
450 AliDebug(1,Form("NSegments = %d ", segments.GetEntriesFast()));
453 //__________________________________________________________________________
454 void AliMUONVTrackReconstructor::RemoveIdenticalTracks()
456 /// To remove identical tracks:
457 /// Tracks are considered identical if they have all their clusters in common.
458 /// One keeps the track with the larger number of clusters if need be
459 AliMUONTrack *track1, *track2;
460 Int_t nTracks = fRecTracksPtr->GetEntriesFast();
461 Int_t clustersInCommon, nClusters1, nClusters2;
462 // Loop over first track of the pair
463 for (Int_t iTrack1 = 0; iTrack1 < nTracks; iTrack1++) {
464 track1 = (AliMUONTrack*) fRecTracksPtr->UncheckedAt(iTrack1);
466 if (!track1) continue;
467 nClusters1 = track1->GetNClusters();
468 // Loop over second track of the pair
469 for (Int_t iTrack2 = iTrack1+1; iTrack2 < nTracks; iTrack2++) {
470 track2 = (AliMUONTrack*) fRecTracksPtr->UncheckedAt(iTrack2);
472 if (!track2) continue;
473 nClusters2 = track2->GetNClusters();
474 // number of clusters in common between two tracks
475 clustersInCommon = track1->ClustersInCommon(track2);
476 // check for identical tracks
477 if ((clustersInCommon == nClusters1) || (clustersInCommon == nClusters2)) {
478 // decide which track to remove
479 if (nClusters2 > nClusters1) {
480 // remove track1 and continue the first loop with the track next to track1
481 fRecTracksPtr->RemoveAt(iTrack1);
485 // remove track2 and continue the second loop with the track next to track2
486 fRecTracksPtr->RemoveAt(iTrack2);
492 fRecTracksPtr->Compress(); // this is essential to retrieve the TClonesArray afterwards
495 //__________________________________________________________________________
496 void AliMUONVTrackReconstructor::RemoveDoubleTracks()
498 /// To remove double tracks:
499 /// Tracks are considered identical if more than half of the clusters of the track
500 /// which has the smaller number of clusters are in common with the other track.
501 /// Among two identical tracks, one keeps the track with the larger number of clusters
502 /// or, if these numbers are equal, the track with the minimum chi2.
503 AliMUONTrack *track1, *track2;
504 Int_t nTracks = fRecTracksPtr->GetEntriesFast();
505 Int_t clustersInCommon2, nClusters1, nClusters2;
506 // Loop over first track of the pair
507 for (Int_t iTrack1 = 0; iTrack1 < nTracks; iTrack1++) {
508 track1 = (AliMUONTrack*) fRecTracksPtr->UncheckedAt(iTrack1);
510 if (!track1) continue;
511 nClusters1 = track1->GetNClusters();
512 // Loop over second track of the pair
513 for (Int_t iTrack2 = iTrack1+1; iTrack2 < nTracks; iTrack2++) {
514 track2 = (AliMUONTrack*) fRecTracksPtr->UncheckedAt(iTrack2);
516 if (!track2) continue;
517 nClusters2 = track2->GetNClusters();
518 // number of clusters in common between two tracks
519 clustersInCommon2 = 2 * track1->ClustersInCommon(track2);
520 // check for identical tracks
521 if (clustersInCommon2 > nClusters1 || clustersInCommon2 > nClusters2) {
522 // decide which track to remove
523 if ((nClusters1 > nClusters2) || ((nClusters1 == nClusters2) && (track1->GetGlobalChi2() <= track2->GetGlobalChi2()))) {
524 // remove track2 and continue the second loop with the track next to track2
525 fRecTracksPtr->RemoveAt(iTrack2);
528 // else remove track1 and continue the first loop with the track next to track1
529 fRecTracksPtr->RemoveAt(iTrack1);
536 fRecTracksPtr->Compress(); // this is essential to retrieve the TClonesArray afterwards
539 //__________________________________________________________________________
540 void AliMUONVTrackReconstructor::RemoveConnectedTracks(Int_t stMin, Int_t stMax, Bool_t all)
542 /// Find and remove tracks sharing 1 cluster or more in station(s) [stMin, stMax].
543 /// For each couple of connected tracks, one removes the one with the smallest
544 /// number of clusters or with the highest chi2 value in case of equality.
545 /// If all=kTRUE: both tracks are removed.
547 // tag the tracks to be removed
548 TagConnectedTracks(stMin, stMax, all);
551 Int_t nTracks = fRecTracksPtr->GetEntriesFast();
552 for (Int_t i = 0; i < nTracks; i++) {
553 if (((AliMUONTrack*) fRecTracksPtr->UncheckedAt(i))->IsConnected()) {
554 fRecTracksPtr->RemoveAt(i);
559 // remove holes in the array if any
560 fRecTracksPtr->Compress();
563 //__________________________________________________________________________
564 void AliMUONVTrackReconstructor::TagConnectedTracks(Int_t stMin, Int_t stMax, Bool_t all)
566 /// Find and tag tracks sharing 1 cluster or more in station(s) [stMin, stMax].
567 /// For each couple of connected tracks, one tags the one with the smallest
568 /// number of clusters or with the highest chi2 value in case of equality.
569 /// If all=kTRUE: both tracks are tagged.
571 AliMUONTrack *track1, *track2;
572 Int_t nClusters1, nClusters2;
573 Int_t nTracks = fRecTracksPtr->GetEntriesFast();
576 for (Int_t i = 0; i < nTracks; i++) ((AliMUONTrack*) fRecTracksPtr->UncheckedAt(i))->Connected(kFALSE);
578 // Loop over first track of the pair
579 for (Int_t iTrack1 = 0; iTrack1 < nTracks; iTrack1++) {
580 track1 = (AliMUONTrack*) fRecTracksPtr->UncheckedAt(iTrack1);
582 // Loop over second track of the pair
583 for (Int_t iTrack2 = iTrack1+1; iTrack2 < nTracks; iTrack2++) {
584 track2 = (AliMUONTrack*) fRecTracksPtr->UncheckedAt(iTrack2);
586 // check for connected tracks and tag them
587 if (track1->ClustersInCommon(track2, stMin, stMax) > 0) {
597 // tag only the worst track
598 nClusters1 = track1->GetNClusters();
599 nClusters2 = track2->GetNClusters();
600 if ((nClusters1 > nClusters2) || ((nClusters1 == nClusters2) && (track1->GetGlobalChi2() <= track2->GetGlobalChi2()))) {
616 //__________________________________________________________________________
617 void AliMUONVTrackReconstructor::AskForNewClustersInChamber(const AliMUONTrackParam &trackParam,
618 AliMUONVClusterStore& clusterStore, Int_t chamber)
620 /// Ask the clustering to reconstruct new clusters around the track candidate position
622 // check if the current chamber is useable
623 if (!fClusterServer || !GetRecoParam()->UseChamber(chamber)) return;
625 // maximum distance between the center of the chamber and a detection element
626 // (accounting for the inclination of the chamber)
627 static const Double_t kMaxDZ = 15.; // 15 cm
629 // extrapolate track parameters to the chamber
630 AliMUONTrackParam extrapTrackParam(trackParam);
631 if (!AliMUONTrackExtrap::ExtrapToZCov(&extrapTrackParam, AliMUONConstants::DefaultChamberZ(chamber))) return;
633 // build the searching area using the track and chamber resolutions and the maximum-distance-to-track value
634 const TMatrixD& kParamCov = extrapTrackParam.GetCovariances();
635 Double_t errX2 = kParamCov(0,0) + kMaxDZ * kMaxDZ * kParamCov(1,1) + 2. * kMaxDZ * TMath::Abs(kParamCov(0,1)) +
636 GetRecoParam()->GetDefaultNonBendingReso(chamber) * GetRecoParam()->GetDefaultNonBendingReso(chamber);
637 Double_t errY2 = kParamCov(2,2) + kMaxDZ * kMaxDZ * kParamCov(3,3) + 2. * kMaxDZ * TMath::Abs(kParamCov(2,3)) +
638 GetRecoParam()->GetDefaultBendingReso(chamber) * GetRecoParam()->GetDefaultBendingReso(chamber);
639 Double_t dX = TMath::Abs(trackParam.GetNonBendingSlope()) * kMaxDZ +
640 GetRecoParam()->GetMaxNonBendingDistanceToTrack() +
641 GetRecoParam()->GetSigmaCutForTracking() * TMath::Sqrt(2. * errX2);
642 Double_t dY = TMath::Abs(trackParam.GetBendingSlope()) * kMaxDZ +
643 GetRecoParam()->GetMaxBendingDistanceToTrack() +
644 GetRecoParam()->GetSigmaCutForTracking() * TMath::Sqrt(2. * errY2);
645 AliMpArea area(extrapTrackParam.GetNonBendingCoor(),
646 extrapTrackParam.GetBendingCoor(),
649 // ask to cluterize in the given area of the given chamber
650 fClusterServer->Clusterize(chamber, clusterStore, area, GetRecoParam());
654 //__________________________________________________________________________
655 void AliMUONVTrackReconstructor::AskForNewClustersInStation(const AliMUONTrackParam &trackParam,
656 AliMUONVClusterStore& clusterStore, Int_t station)
658 /// Ask the clustering to reconstruct new clusters around the track candidate position
659 /// in the 2 chambers of the given station
660 AskForNewClustersInChamber(trackParam, clusterStore, 2*station+1);
661 AskForNewClustersInChamber(trackParam, clusterStore, 2*station);
664 //__________________________________________________________________________
665 Double_t AliMUONVTrackReconstructor::TryOneCluster(const AliMUONTrackParam &trackParam, AliMUONVCluster* cluster,
666 AliMUONTrackParam &trackParamAtCluster, Bool_t updatePropagator)
668 /// Test the compatibility between the track and the cluster (using trackParam's covariance matrix):
669 /// return the corresponding Chi2
670 /// return trackParamAtCluster
672 // extrapolate track parameters and covariances at the z position of the tested cluster
673 // and set pointer to cluster into trackParamAtCluster
674 trackParamAtCluster = trackParam;
675 trackParamAtCluster.SetClusterPtr(cluster);
676 if (!AliMUONTrackExtrap::ExtrapToZCov(&trackParamAtCluster, cluster->GetZ(), updatePropagator))
677 return 2.*AliMUONTrack::MaxChi2();
679 // Set differences between trackParam and cluster in the bending and non bending directions
680 Double_t dX = cluster->GetX() - trackParamAtCluster.GetNonBendingCoor();
681 Double_t dY = cluster->GetY() - trackParamAtCluster.GetBendingCoor();
683 // Calculate errors and covariances
684 const TMatrixD& kParamCov = trackParamAtCluster.GetCovariances();
685 Double_t sigmaX2 = kParamCov(0,0) + cluster->GetErrX2();
686 Double_t sigmaY2 = kParamCov(2,2) + cluster->GetErrY2();
687 Double_t covXY = kParamCov(0,2);
688 Double_t det = sigmaX2 * sigmaY2 - covXY * covXY;
691 if (det == 0.) return 2.*AliMUONTrack::MaxChi2();
692 return (dX * dX * sigmaY2 + dY * dY * sigmaX2 - 2. * dX * dY * covXY) / det;
696 //__________________________________________________________________________
697 Bool_t AliMUONVTrackReconstructor::TryOneClusterFast(const AliMUONTrackParam &trackParam, const AliMUONVCluster* cluster)
699 /// Test the compatibility between the track and the cluster
700 /// given the track and cluster resolutions + the maximum-distance-to-track value
701 /// and assuming linear propagation of the track:
702 /// return kTRUE if they are compatibles
704 Double_t dZ = cluster->GetZ() - trackParam.GetZ();
705 Double_t dX = cluster->GetX() - (trackParam.GetNonBendingCoor() + trackParam.GetNonBendingSlope() * dZ);
706 Double_t dY = cluster->GetY() - (trackParam.GetBendingCoor() + trackParam.GetBendingSlope() * dZ);
707 const TMatrixD& kParamCov = trackParam.GetCovariances();
708 Double_t errX2 = kParamCov(0,0) + dZ * dZ * kParamCov(1,1) + 2. * dZ * kParamCov(0,1) + cluster->GetErrX2();
709 Double_t errY2 = kParamCov(2,2) + dZ * dZ * kParamCov(3,3) + 2. * dZ * kParamCov(2,3) + cluster->GetErrY2();
711 Double_t dXmax = GetRecoParam()->GetSigmaCutForTracking() * TMath::Sqrt(2. * errX2) +
712 GetRecoParam()->GetMaxNonBendingDistanceToTrack();
713 Double_t dYmax = GetRecoParam()->GetSigmaCutForTracking() * TMath::Sqrt(2. * errY2) +
714 GetRecoParam()->GetMaxBendingDistanceToTrack();
716 if (TMath::Abs(dX) > dXmax || TMath::Abs(dY) > dYmax) return kFALSE;
722 //__________________________________________________________________________
723 Double_t AliMUONVTrackReconstructor::TryTwoClustersFast(const AliMUONTrackParam &trackParamAtCluster1, AliMUONVCluster* cluster2,
724 AliMUONTrackParam &trackParamAtCluster2)
726 /// Test the compatibility between the track and the 2 clusters together (using trackParam's covariance matrix)
727 /// assuming linear propagation between the two clusters:
728 /// return the corresponding Chi2 accounting for covariances between the 2 clusters
729 /// return trackParamAtCluster2
731 // extrapolate linearly track parameters and covariances at the z position of the second cluster
732 trackParamAtCluster2 = trackParamAtCluster1;
733 AliMUONTrackExtrap::LinearExtrapToZCov(&trackParamAtCluster2, cluster2->GetZ());
735 // set pointer to cluster2 into trackParamAtCluster2
736 trackParamAtCluster2.SetClusterPtr(cluster2);
738 // Set differences between track and clusters in the bending and non bending directions
739 AliMUONVCluster* cluster1 = trackParamAtCluster1.GetClusterPtr();
740 Double_t dX1 = cluster1->GetX() - trackParamAtCluster1.GetNonBendingCoor();
741 Double_t dX2 = cluster2->GetX() - trackParamAtCluster2.GetNonBendingCoor();
742 Double_t dY1 = cluster1->GetY() - trackParamAtCluster1.GetBendingCoor();
743 Double_t dY2 = cluster2->GetY() - trackParamAtCluster2.GetBendingCoor();
745 // Calculate errors and covariances
746 const TMatrixD& kParamCov1 = trackParamAtCluster1.GetCovariances();
747 const TMatrixD& kParamCov2 = trackParamAtCluster2.GetCovariances();
748 Double_t dZ = trackParamAtCluster2.GetZ() - trackParamAtCluster1.GetZ();
749 Double_t sigma2X1 = kParamCov1(0,0) + cluster1->GetErrX2();
750 Double_t sigma2X2 = kParamCov2(0,0) + cluster2->GetErrX2();
751 Double_t covX1X2 = kParamCov1(0,0) + dZ * kParamCov1(0,1);
752 Double_t sigma2Y1 = kParamCov1(2,2) + cluster1->GetErrY2();
753 Double_t sigma2Y2 = kParamCov2(2,2) + cluster2->GetErrY2();
754 Double_t covY1Y2 = kParamCov1(2,2) + dZ * kParamCov1(2,3);
757 Double_t detX = sigma2X1 * sigma2X2 - covX1X2 * covX1X2;
758 Double_t detY = sigma2Y1 * sigma2Y2 - covY1Y2 * covY1Y2;
759 if (detX == 0. || detY == 0.) return 2.*AliMUONTrack::MaxChi2();
760 return (dX1 * dX1 * sigma2X2 + dX2 * dX2 * sigma2X1 - 2. * dX1 * dX2 * covX1X2) / detX
761 + (dY1 * dY1 * sigma2Y2 + dY2 * dY2 * sigma2Y1 - 2. * dY1 * dY2 * covY1Y2) / detY;
765 //__________________________________________________________________________
766 Bool_t AliMUONVTrackReconstructor::FollowLinearTrackInChamber(AliMUONTrack &trackCandidate, const AliMUONVClusterStore& clusterStore,
769 /// Follow trackCandidate in chamber(0..) nextChamber assuming linear propagation, and search for compatible cluster(s)
770 /// Keep all possibilities or only the best one(s) according to the flag fgkTrackAllTracks:
771 /// kTRUE: duplicate "trackCandidate" if there are several possibilities and add the new tracks at the end of
772 /// fRecTracksPtr to avoid conficts with other track candidates at this current stage of the tracking procedure.
773 /// Remove the obsolete "trackCandidate" at the end.
774 /// kFALSE: add only the best cluster(s) to the "trackCandidate". Try to add a couple of clusters in priority.
775 /// return kTRUE if new cluster(s) have been found (otherwise return kFALSE)
776 AliDebug(1,Form("Enter FollowLinearTrackInChamber(1..) %d", nextChamber+1));
778 Double_t chi2WithOneCluster = AliMUONTrack::MaxChi2();
779 Double_t maxChi2WithOneCluster = 2. * GetRecoParam()->GetSigmaCutForTracking() *
780 GetRecoParam()->GetSigmaCutForTracking(); // 2 because 2 quantities in chi2
781 Double_t bestChi2WithOneCluster = maxChi2WithOneCluster;
782 Bool_t foundOneCluster = kFALSE;
783 AliMUONTrack *newTrack = 0x0;
784 AliMUONVCluster *cluster;
785 AliMUONTrackParam trackParam;
786 AliMUONTrackParam extrapTrackParamAtCluster;
787 AliMUONTrackParam bestTrackParamAtCluster;
789 // Get track parameters according to the propagation direction
790 if (nextChamber > 7) trackParam = *(AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->Last();
791 else trackParam = *(AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->First();
793 // Printout for debuging
794 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 2) || (AliLog::GetGlobalDebugLevel() >= 2)) {
795 cout<<endl<<"Track parameters and covariances at first cluster:"<<endl;
796 trackParam.GetParameters().Print();
797 trackParam.GetCovariances().Print();
801 AliMUONTrackExtrap::AddMCSEffect(&trackParam,AliMUONConstants::ChamberThicknessInX0(trackParam.GetClusterPtr()->GetChamberId()),-1.);
803 // Printout for debuging
804 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
805 cout << "FollowLinearTrackInChamber: look for cluster in chamber(1..): " << nextChamber+1 << endl;
808 // Create iterators to loop over clusters in chamber
809 TIter next(clusterStore.CreateChamberIterator(nextChamber,nextChamber));
811 // look for candidates in chamber
812 while ( ( cluster = static_cast<AliMUONVCluster*>(next()) ) ) {
814 // try to add the current cluster fast
815 if (!TryOneClusterFast(trackParam, cluster)) continue;
817 // try to add the current cluster accuratly
818 extrapTrackParamAtCluster = trackParam;
819 AliMUONTrackExtrap::LinearExtrapToZCov(&extrapTrackParamAtCluster, cluster->GetZ());
820 chi2WithOneCluster = TryOneCluster(extrapTrackParamAtCluster, cluster, extrapTrackParamAtCluster);
822 // if good chi2 then consider to add cluster
823 if (chi2WithOneCluster < maxChi2WithOneCluster) {
824 foundOneCluster = kTRUE;
826 // Printout for debuging
827 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
828 cout << "FollowLinearTrackInChamber: found one cluster in chamber(1..): " << nextChamber+1
829 << " (Chi2 = " << chi2WithOneCluster << ")" << endl;
833 if (GetRecoParam()->TrackAllTracks()) {
834 // copy trackCandidate into a new track put at the end of fRecTracksPtr and add the new cluster
835 newTrack = new ((*fRecTracksPtr)[fRecTracksPtr->GetLast()+1]) AliMUONTrack(trackCandidate);
836 if (GetRecoParam()->RequestStation(nextChamber/2))
837 extrapTrackParamAtCluster.SetRemovable(kFALSE);
838 else extrapTrackParamAtCluster.SetRemovable(kTRUE);
839 newTrack->AddTrackParamAtCluster(extrapTrackParamAtCluster,*cluster);
840 newTrack->SetGlobalChi2(trackCandidate.GetGlobalChi2()+chi2WithOneCluster);
843 // Printout for debuging
844 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
845 cout << "FollowLinearTrackInChamber: added one cluster in chamber(1..): " << nextChamber+1 << endl;
846 if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump();
849 } else if (chi2WithOneCluster < bestChi2WithOneCluster) {
850 // keep track of the best cluster
851 bestChi2WithOneCluster = chi2WithOneCluster;
852 bestTrackParamAtCluster = extrapTrackParamAtCluster;
859 // fill out the best track if required else clean up the fRecTracksPtr array
860 if (!GetRecoParam()->TrackAllTracks()) {
861 if (foundOneCluster) {
862 if (GetRecoParam()->RequestStation(nextChamber/2))
863 bestTrackParamAtCluster.SetRemovable(kFALSE);
864 else bestTrackParamAtCluster.SetRemovable(kTRUE);
865 trackCandidate.AddTrackParamAtCluster(bestTrackParamAtCluster,*(bestTrackParamAtCluster.GetClusterPtr()));
866 trackCandidate.SetGlobalChi2(trackCandidate.GetGlobalChi2()+bestChi2WithOneCluster);
868 // Printout for debuging
869 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
870 cout << "FollowLinearTrackInChamber: added the best cluster in chamber(1..): " << bestTrackParamAtCluster.GetClusterPtr()->GetChamberId()+1 << endl;
871 if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump();
874 } else return kFALSE;
876 } else if (foundOneCluster) {
878 // remove obsolete track
879 fRecTracksPtr->Remove(&trackCandidate);
882 } else return kFALSE;
888 //__________________________________________________________________________
889 Bool_t AliMUONVTrackReconstructor::FollowLinearTrackInStation(AliMUONTrack &trackCandidate, const AliMUONVClusterStore& clusterStore,
892 /// Follow trackCandidate in station(0..) nextStation assuming linear propagation, and search for compatible cluster(s)
893 /// Keep all possibilities or only the best one(s) according to the flag fgkTrackAllTracks:
894 /// kTRUE: duplicate "trackCandidate" if there are several possibilities and add the new tracks at the end of
895 /// fRecTracksPtr to avoid conficts with other track candidates at this current stage of the tracking procedure.
896 /// Remove the obsolete "trackCandidate" at the end.
897 /// kFALSE: add only the best cluster(s) to the "trackCandidate". Try to add a couple of clusters in priority.
898 /// return kTRUE if new cluster(s) have been found (otherwise return kFALSE)
899 AliDebug(1,Form("Enter FollowLinearTrackInStation(1..) %d", nextStation+1));
901 // Order the chamber according to the propagation direction (tracking starts with chamber 2):
902 // - nextStation == station(1...) 5 => forward propagation
903 // - nextStation < station(1...) 5 => backward propagation
905 if (nextStation==4) {
906 ch1 = 2*nextStation+1;
910 ch2 = 2*nextStation+1;
913 Double_t chi2WithOneCluster = AliMUONTrack::MaxChi2();
914 Double_t chi2WithTwoClusters = AliMUONTrack::MaxChi2();
915 Double_t maxChi2WithOneCluster = 2. * GetRecoParam()->GetSigmaCutForTracking() *
916 GetRecoParam()->GetSigmaCutForTracking(); // 2 because 2 quantities in chi2
917 Double_t maxChi2WithTwoClusters = 4. * GetRecoParam()->GetSigmaCutForTracking() *
918 GetRecoParam()->GetSigmaCutForTracking(); // 4 because 4 quantities in chi2
919 Double_t bestChi2WithOneCluster = maxChi2WithOneCluster;
920 Double_t bestChi2WithTwoClusters = maxChi2WithTwoClusters;
921 Bool_t foundOneCluster = kFALSE;
922 Bool_t foundTwoClusters = kFALSE;
923 AliMUONTrack *newTrack = 0x0;
924 AliMUONVCluster *clusterCh1, *clusterCh2;
925 AliMUONTrackParam trackParam;
926 AliMUONTrackParam extrapTrackParamAtCluster1;
927 AliMUONTrackParam extrapTrackParamAtCluster2;
928 AliMUONTrackParam bestTrackParamAtCluster1;
929 AliMUONTrackParam bestTrackParamAtCluster2;
931 Int_t nClusters = clusterStore.GetSize();
932 Bool_t *clusterCh1Used = new Bool_t[nClusters];
933 for (Int_t i = 0; i < nClusters; i++) clusterCh1Used[i] = kFALSE;
936 // Get track parameters according to the propagation direction
937 if (nextStation==4) trackParam = *(AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->Last();
938 else trackParam = *(AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->First();
940 // Printout for debuging
941 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 2) || (AliLog::GetGlobalDebugLevel() >= 2)) {
942 cout<<endl<<"Track parameters and covariances at first cluster:"<<endl;
943 trackParam.GetParameters().Print();
944 trackParam.GetCovariances().Print();
948 AliMUONTrackExtrap::AddMCSEffect(&trackParam,AliMUONConstants::ChamberThicknessInX0(trackParam.GetClusterPtr()->GetChamberId()),-1.);
950 // Printout for debuging
951 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
952 cout << "FollowLinearTrackInStation: look for clusters in chamber(1..): " << ch2+1 << endl;
955 // Create iterators to loop over clusters in both chambers
956 TIter nextInCh1(clusterStore.CreateChamberIterator(ch1,ch1));
957 TIter nextInCh2(clusterStore.CreateChamberIterator(ch2,ch2));
959 // look for candidates in chamber 2
960 while ( ( clusterCh2 = static_cast<AliMUONVCluster*>(nextInCh2()) ) ) {
962 // try to add the current cluster fast
963 if (!TryOneClusterFast(trackParam, clusterCh2)) continue;
965 // try to add the current cluster accuratly
966 extrapTrackParamAtCluster2 = trackParam;
967 AliMUONTrackExtrap::LinearExtrapToZCov(&extrapTrackParamAtCluster2, clusterCh2->GetZ());
968 chi2WithOneCluster = TryOneCluster(extrapTrackParamAtCluster2, clusterCh2, extrapTrackParamAtCluster2);
970 // if good chi2 then try to attach a cluster in the other chamber too
971 if (chi2WithOneCluster < maxChi2WithOneCluster) {
972 Bool_t foundSecondCluster = kFALSE;
974 // Printout for debuging
975 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
976 cout << "FollowLinearTrackInStation: found one cluster in chamber(1..): " << ch2+1
977 << " (Chi2 = " << chi2WithOneCluster << ")" << endl;
979 cout << " look for second clusters in chamber(1..): " << ch1+1 << " ..." << endl;
983 AliMUONTrackExtrap::AddMCSEffect(&extrapTrackParamAtCluster2,AliMUONConstants::ChamberThicknessInX0(ch2),-1.);
985 // reset cluster iterator of chamber 1
989 // look for second candidates in chamber 1
990 while ( ( clusterCh1 = static_cast<AliMUONVCluster*>(nextInCh1()) ) ) {
993 // try to add the current cluster fast
994 if (!TryOneClusterFast(extrapTrackParamAtCluster2, clusterCh1)) continue;
996 // try to add the current cluster in addition to the one found in the previous chamber
997 chi2WithTwoClusters = TryTwoClustersFast(extrapTrackParamAtCluster2, clusterCh1, extrapTrackParamAtCluster1);
999 // if good chi2 then consider to add the 2 clusters to the "trackCandidate"
1000 if (chi2WithTwoClusters < maxChi2WithTwoClusters) {
1001 foundSecondCluster = kTRUE;
1002 foundTwoClusters = kTRUE;
1004 // Printout for debuging
1005 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
1006 cout << "FollowLinearTrackInStation: found one cluster in chamber(1..): " << ch1+1
1007 << " (Chi2 = " << chi2WithTwoClusters << ")" << endl;
1008 clusterCh1->Print();
1011 if (GetRecoParam()->TrackAllTracks()) {
1012 // copy trackCandidate into a new track put at the end of fRecTracksPtr and add the new clusters
1013 newTrack = new ((*fRecTracksPtr)[fRecTracksPtr->GetLast()+1]) AliMUONTrack(trackCandidate);
1014 extrapTrackParamAtCluster1.SetRemovable(kTRUE);
1015 newTrack->AddTrackParamAtCluster(extrapTrackParamAtCluster1,*clusterCh1);
1016 extrapTrackParamAtCluster2.SetRemovable(kTRUE);
1017 newTrack->AddTrackParamAtCluster(extrapTrackParamAtCluster2,*clusterCh2);
1018 newTrack->SetGlobalChi2(newTrack->GetGlobalChi2()+chi2WithTwoClusters);
1021 // Tag clusterCh1 as used
1022 clusterCh1Used[iCluster1] = kTRUE;
1024 // Printout for debuging
1025 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
1026 cout << "FollowLinearTrackInStation: added two clusters in station(1..): " << nextStation+1 << endl;
1027 if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump();
1030 } else if (chi2WithTwoClusters < bestChi2WithTwoClusters) {
1031 // keep track of the best couple of clusters
1032 bestChi2WithTwoClusters = chi2WithTwoClusters;
1033 bestTrackParamAtCluster1 = extrapTrackParamAtCluster1;
1034 bestTrackParamAtCluster2 = extrapTrackParamAtCluster2;
1041 // if no cluster found in chamber1 then consider to add clusterCh2 only
1042 if (!foundSecondCluster) {
1043 foundOneCluster = kTRUE;
1045 if (GetRecoParam()->TrackAllTracks()) {
1046 // copy trackCandidate into a new track put at the end of fRecTracksPtr and add the new cluster
1047 newTrack = new ((*fRecTracksPtr)[fRecTracksPtr->GetLast()+1]) AliMUONTrack(trackCandidate);
1048 if (GetRecoParam()->RequestStation(nextStation))
1049 extrapTrackParamAtCluster2.SetRemovable(kFALSE);
1050 else extrapTrackParamAtCluster2.SetRemovable(kTRUE);
1051 newTrack->AddTrackParamAtCluster(extrapTrackParamAtCluster2,*clusterCh2);
1052 newTrack->SetGlobalChi2(newTrack->GetGlobalChi2()+chi2WithOneCluster);
1055 // Printout for debuging
1056 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
1057 cout << "FollowLinearTrackInStation: added one cluster in chamber(1..): " << ch2+1 << endl;
1058 if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump();
1061 } else if (!foundTwoClusters && chi2WithOneCluster < bestChi2WithOneCluster) {
1062 // keep track of the best cluster except if a couple of clusters has already been found
1063 bestChi2WithOneCluster = chi2WithOneCluster;
1064 bestTrackParamAtCluster1 = extrapTrackParamAtCluster2;
1073 // look for candidates in chamber 1 not already attached to a track
1074 // if we want to keep all possible tracks or if no good couple of clusters has been found
1075 if (GetRecoParam()->TrackAllTracks() || !foundTwoClusters) {
1077 // Printout for debuging
1078 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
1079 cout << "FollowLinearTrackInStation: look for single cluster in chamber(1..): " << ch1+1 << endl;
1082 //Extrapolate trackCandidate to chamber "ch2"
1083 AliMUONTrackExtrap::LinearExtrapToZCov(&trackParam, AliMUONConstants::DefaultChamberZ(ch2));
1085 // add MCS effect for next step
1086 AliMUONTrackExtrap::AddMCSEffect(&trackParam,AliMUONConstants::ChamberThicknessInX0(ch2),-1.);
1088 // reset cluster iterator of chamber 1
1092 // look for second candidates in chamber 1
1093 while ( ( clusterCh1 = static_cast<AliMUONVCluster*>(nextInCh1()) ) ) {
1096 if (clusterCh1Used[iCluster1]) continue; // Skip clusters already used
1098 // try to add the current cluster fast
1099 if (!TryOneClusterFast(trackParam, clusterCh1)) continue;
1101 // try to add the current cluster accuratly
1102 extrapTrackParamAtCluster1 = trackParam;
1103 AliMUONTrackExtrap::LinearExtrapToZCov(&extrapTrackParamAtCluster1, clusterCh1->GetZ());
1104 chi2WithOneCluster = TryOneCluster(extrapTrackParamAtCluster1, clusterCh1, extrapTrackParamAtCluster1);
1106 // if good chi2 then consider to add clusterCh1
1107 // We do not try to attach a cluster in the other chamber too since it has already been done above
1108 if (chi2WithOneCluster < maxChi2WithOneCluster) {
1109 foundOneCluster = kTRUE;
1111 // Printout for debuging
1112 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
1113 cout << "FollowLinearTrackInStation: found one cluster in chamber(1..): " << ch1+1
1114 << " (Chi2 = " << chi2WithOneCluster << ")" << endl;
1115 clusterCh1->Print();
1118 if (GetRecoParam()->TrackAllTracks()) {
1119 // copy trackCandidate into a new track put at the end of fRecTracksPtr and add the new cluster
1120 newTrack = new ((*fRecTracksPtr)[fRecTracksPtr->GetLast()+1]) AliMUONTrack(trackCandidate);
1121 if (GetRecoParam()->RequestStation(nextStation))
1122 extrapTrackParamAtCluster1.SetRemovable(kFALSE);
1123 else extrapTrackParamAtCluster1.SetRemovable(kTRUE);
1124 newTrack->AddTrackParamAtCluster(extrapTrackParamAtCluster1,*clusterCh1);
1125 newTrack->SetGlobalChi2(newTrack->GetGlobalChi2()+chi2WithOneCluster);
1128 // Printout for debuging
1129 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
1130 cout << "FollowLinearTrackInStation: added one cluster in chamber(1..): " << ch1+1 << endl;
1131 if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump();
1134 } else if (chi2WithOneCluster < bestChi2WithOneCluster) {
1135 // keep track of the best cluster except if a couple of clusters has already been found
1136 bestChi2WithOneCluster = chi2WithOneCluster;
1137 bestTrackParamAtCluster1 = extrapTrackParamAtCluster1;
1146 // fill out the best track if required else clean up the fRecTracksPtr array
1147 if (!GetRecoParam()->TrackAllTracks()) {
1148 if (foundTwoClusters) {
1149 bestTrackParamAtCluster1.SetRemovable(kTRUE);
1150 trackCandidate.AddTrackParamAtCluster(bestTrackParamAtCluster1,*(bestTrackParamAtCluster1.GetClusterPtr()));
1151 bestTrackParamAtCluster2.SetRemovable(kTRUE);
1152 trackCandidate.AddTrackParamAtCluster(bestTrackParamAtCluster2,*(bestTrackParamAtCluster2.GetClusterPtr()));
1153 trackCandidate.SetGlobalChi2(trackCandidate.GetGlobalChi2()+bestChi2WithTwoClusters);
1155 // Printout for debuging
1156 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
1157 cout << "FollowLinearTrackInStation: added the two best clusters in station(1..): " << nextStation+1 << endl;
1158 if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump();
1161 } else if (foundOneCluster) {
1162 if (GetRecoParam()->RequestStation(nextStation))
1163 bestTrackParamAtCluster1.SetRemovable(kFALSE);
1164 else bestTrackParamAtCluster1.SetRemovable(kTRUE);
1165 trackCandidate.AddTrackParamAtCluster(bestTrackParamAtCluster1,*(bestTrackParamAtCluster1.GetClusterPtr()));
1166 trackCandidate.SetGlobalChi2(trackCandidate.GetGlobalChi2()+bestChi2WithOneCluster);
1168 // Printout for debuging
1169 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
1170 cout << "FollowLinearTrackInStation: added the best cluster in chamber(1..): " << bestTrackParamAtCluster1.GetClusterPtr()->GetChamberId()+1 << endl;
1171 if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump();
1175 delete [] clusterCh1Used;
1179 } else if (foundOneCluster || foundTwoClusters) {
1181 // remove obsolete track
1182 fRecTracksPtr->Remove(&trackCandidate);
1186 delete [] clusterCh1Used;
1190 delete [] clusterCh1Used;
1195 //__________________________________________________________________________
1196 void AliMUONVTrackReconstructor::ImproveTracks()
1198 /// Improve tracks by removing clusters with local chi2 highter than the defined cut
1199 /// Recompute track parameters and covariances at the remaining clusters
1200 AliDebug(1,"Enter ImproveTracks");
1202 AliMUONTrack *track, *nextTrack;
1204 track = (AliMUONTrack*) fRecTracksPtr->First();
1207 // prepare next track in case the actual track is suppressed
1208 nextTrack = (AliMUONTrack*) fRecTracksPtr->After(track);
1210 ImproveTrack(*track);
1212 // remove track if improvement failed
1213 if (!track->IsImproved()) {
1214 fRecTracksPtr->Remove(track);
1221 // compress the array in case of some tracks have been removed
1222 fRecTracksPtr->Compress();
1226 //__________________________________________________________________________
1227 void AliMUONVTrackReconstructor::Finalize()
1229 /// Recompute track parameters and covariances at each attached cluster
1230 /// Set the label pointing to the corresponding MC track
1231 /// Remove the track if finalization failed
1233 AliMUONTrack *track, *nextTrack;
1234 Bool_t trackRemoved = kFALSE;
1236 track = (AliMUONTrack*) fRecTracksPtr->First();
1239 nextTrack = (AliMUONTrack*) fRecTracksPtr->After(track);
1241 if (FinalizeTrack(*track)) track->FindMCLabel();
1243 fRecTracksPtr->Remove(track);
1245 trackRemoved = kTRUE;
1252 // compress array of tracks if needed
1253 if (trackRemoved) fRecTracksPtr->Compress();
1257 //__________________________________________________________________________
1258 void AliMUONVTrackReconstructor::ValidateTracksWithTrigger(AliMUONVTrackStore& trackStore,
1259 const AliMUONVTriggerTrackStore& triggerTrackStore,
1260 const AliMUONVTriggerStore& triggerStore,
1261 const AliMUONTrackHitPattern& trackHitPattern)
1263 /// Try to match track from tracking system with trigger track
1264 AliCodeTimerAuto("",0);
1266 trackHitPattern.ExecuteValidation(trackStore, triggerTrackStore, triggerStore);
1270 //__________________________________________________________________________
1271 void AliMUONVTrackReconstructor::EventReconstructTrigger(const AliMUONTriggerCircuit& circuit,
1272 const AliMUONVTriggerStore& triggerStore,
1273 AliMUONVTriggerTrackStore& triggerTrackStore)
1275 /// Fill trigger track store from local trigger
1277 AliCodeTimerAuto("",0);
1279 AliMUONGlobalTrigger* globalTrigger = triggerStore.Global();
1281 UChar_t gloTrigPat = 0;
1285 gloTrigPat = globalTrigger->GetGlobalResponse();
1288 AliMUONTriggerTrack triggerTrack;
1290 TIter next(triggerStore.CreateIterator());
1291 AliMUONLocalTrigger* locTrg(0x0);
1293 while ( ( locTrg = static_cast<AliMUONLocalTrigger*>(next()) ) )
1295 if ( locTrg->IsTrigX() && locTrg->IsTrigY() )
1296 { // make Trigger Track if trigger in X and Y
1298 TriggerToTrack(circuit, *locTrg, triggerTrack, gloTrigPat);
1300 triggerTrackStore.Add(triggerTrack);
1302 } // end of loop on Local Trigger
1305 //__________________________________________________________________________
1306 void AliMUONVTrackReconstructor::TriggerToTrack(const AliMUONTriggerCircuit& circuit,
1307 const AliMUONLocalTrigger& locTrg,
1308 AliMUONTriggerTrack& triggerTrack,
1309 UChar_t globalTriggerPattern)
1311 /// To make the trigger tracks from Local Trigger
1312 const Double_t kTrigNonBendReso = AliMUONConstants::TriggerNonBendingReso();
1313 const Double_t kTrigBendReso = AliMUONConstants::TriggerBendingReso();
1314 const Double_t kSqrt12 = TMath::Sqrt(12.);
1316 TMatrixD trigCov(3,3);
1318 Int_t localBoardId = locTrg.LoCircuit();
1320 Float_t y11 = circuit.GetY11Pos(localBoardId, locTrg.LoStripX());
1321 Float_t z11 = circuit.GetZ11Pos(localBoardId, locTrg.LoStripX());
1322 // need first to convert deviation to [0-30]
1323 // (see AliMUONLocalTriggerBoard::LocalTrigger)
1324 Int_t deviation = locTrg.GetDeviation();
1325 Int_t stripX21 = locTrg.LoStripX()+deviation+1;
1326 Float_t y21 = circuit.GetY21Pos(localBoardId, stripX21);
1327 Float_t z21 = circuit.GetZ21Pos(localBoardId, stripX21);
1328 Float_t x11 = circuit.GetX11Pos(localBoardId, locTrg.LoStripY());
1330 AliDebug(1, Form(" MakeTriggerTrack %3d %2d %2d %2d (%f %f %f) (%f %f)\n",locTrg.LoCircuit(),
1331 locTrg.LoStripX(),locTrg.LoStripX()+deviation+1,locTrg.LoStripY(),x11, y11, z11, y21, z21));
1333 Double_t deltaZ = z11 - z21;
1335 Float_t slopeX = x11/z11;
1336 Float_t slopeY = (y11-y21) / deltaZ;
1338 Float_t sigmaX = circuit.GetX11Width(localBoardId, locTrg.LoStripY()) / kSqrt12;
1339 Float_t sigmaY = circuit.GetY11Width(localBoardId, locTrg.LoStripX()) / kSqrt12;
1340 Float_t sigmaY21 = circuit.GetY21Width(localBoardId, locTrg.LoStripX()) / kSqrt12;
1343 trigCov(0,0) = kTrigNonBendReso * kTrigNonBendReso + sigmaX * sigmaX;
1344 trigCov(1,1) = kTrigBendReso * kTrigBendReso + sigmaY * sigmaY;
1346 (2. * kTrigBendReso * kTrigBendReso + sigmaY * sigmaY + sigmaY21 * sigmaY21 ) / deltaZ / deltaZ;
1347 trigCov(1,2) = trigCov(2,1) = trigCov(1,1) / deltaZ;
1349 triggerTrack.SetX11(x11);
1350 triggerTrack.SetY11(y11);
1351 triggerTrack.SetZ11(z11);
1352 triggerTrack.SetZ21(z21);
1353 triggerTrack.SetSlopeX(slopeX);
1354 triggerTrack.SetSlopeY(slopeY);
1355 triggerTrack.SetGTPattern(globalTriggerPattern);
1356 triggerTrack.SetLoTrgNum(localBoardId);
1357 triggerTrack.SetCovariances(trigCov);
1358 triggerTrack.SetUniqueID(locTrg.GetUniqueID());