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 //-----------------------------------------------------------------------------
21 // Reconstructed track in ALICE dimuon spectrometer
22 //-----------------------------------------------------------------------------
24 #include "AliMUONTrack.h"
26 #include "AliMUONReconstructor.h"
27 #include "AliMUONVCluster.h"
28 #include "AliMUONVClusterStore.h"
29 #include "AliMUONObjectPair.h"
30 #include "AliMUONTrackExtrap.h"
31 #include "AliMUONConstants.h"
32 #include "AliMUONTrackParam.h"
38 #include <Riostream.h>
41 ClassImp(AliMUONTrack) // Class implementation in ROOT context
45 const Double_t AliMUONTrack::fgkMaxChi2 = 1.e10; ///< maximum chi2 above which the track can be considered as abnormal
48 //__________________________________________________________________________
49 AliMUONTrack::AliMUONTrack()
51 fTrackParamAtCluster(0x0),
52 fFitWithVertex(kFALSE),
55 fClusterWeightsNonBending(0x0),
56 fClusterWeightsBending(0x0),
60 fChi2MatchTrigger(0.),
62 fTrackParamAtVertex(0x0),
63 fHitsPatternInTrigCh(0),
67 /// Default constructor
68 fVertexErrXY2[0] = 0.;
69 fVertexErrXY2[1] = 0.;
72 //__________________________________________________________________________
73 AliMUONTrack::AliMUONTrack(AliMUONObjectPair *segment, Double_t bendingVertexDispersion)
75 fTrackParamAtCluster(new TClonesArray("AliMUONTrackParam",10)),
76 fFitWithVertex(kFALSE),
79 fClusterWeightsNonBending(0x0),
80 fClusterWeightsBending(0x0),
84 fChi2MatchTrigger(0.),
86 fTrackParamAtVertex(0x0),
87 fHitsPatternInTrigCh(0),
91 /// Constructor from two clusters
93 fVertexErrXY2[0] = 0.;
94 fVertexErrXY2[1] = 0.;
96 // Pointers to clusters from the segment
97 AliMUONVCluster* firstCluster = (AliMUONVCluster*) segment->First();
98 AliMUONVCluster* lastCluster = (AliMUONVCluster*) segment->Second();
100 // Compute track parameters
101 Double_t z1 = firstCluster->GetZ();
102 Double_t z2 = lastCluster->GetZ();
103 Double_t dZ = z1 - z2;
105 Double_t nonBendingCoor1 = firstCluster->GetX();
106 Double_t nonBendingCoor2 = lastCluster->GetX();
107 Double_t nonBendingSlope = (nonBendingCoor1 - nonBendingCoor2) / dZ;
109 Double_t bendingCoor1 = firstCluster->GetY();
110 Double_t bendingCoor2 = lastCluster->GetY();
111 Double_t bendingSlope = (bendingCoor1 - bendingCoor2) / dZ;
112 // Inverse bending momentum
113 Double_t bendingImpact = bendingCoor1 - z1 * bendingSlope;
114 Double_t inverseBendingMomentum = 1. / AliMUONTrackExtrap::GetBendingMomentumFromImpactParam(bendingImpact);
116 // Set track parameters at first cluster
117 AliMUONTrackParam trackParamAtFirstCluster;
118 trackParamAtFirstCluster.SetZ(z1);
119 trackParamAtFirstCluster.SetNonBendingCoor(nonBendingCoor1);
120 trackParamAtFirstCluster.SetNonBendingSlope(nonBendingSlope);
121 trackParamAtFirstCluster.SetBendingCoor(bendingCoor1);
122 trackParamAtFirstCluster.SetBendingSlope(bendingSlope);
123 trackParamAtFirstCluster.SetInverseBendingMomentum(inverseBendingMomentum);
125 // Set track parameters at last cluster
126 AliMUONTrackParam trackParamAtLastCluster;
127 trackParamAtLastCluster.SetZ(z2);
128 trackParamAtLastCluster.SetNonBendingCoor(nonBendingCoor2);
129 trackParamAtLastCluster.SetNonBendingSlope(nonBendingSlope);
130 trackParamAtLastCluster.SetBendingCoor(bendingCoor2);
131 trackParamAtLastCluster.SetBendingSlope(bendingSlope);
132 trackParamAtLastCluster.SetInverseBendingMomentum(inverseBendingMomentum);
134 // Compute and set track parameters covariances at first cluster
135 TMatrixD paramCov(5,5);
138 paramCov(0,0) = firstCluster->GetErrX2();
139 paramCov(0,1) = firstCluster->GetErrX2() / dZ;
140 paramCov(1,0) = paramCov(0,1);
141 paramCov(1,1) = ( firstCluster->GetErrX2() + lastCluster->GetErrX2() ) / dZ / dZ;
143 paramCov(2,2) = firstCluster->GetErrY2();
144 paramCov(2,3) = firstCluster->GetErrY2() / dZ;
145 paramCov(3,2) = paramCov(2,3);
146 paramCov(3,3) = ( firstCluster->GetErrY2() + lastCluster->GetErrY2() ) / dZ / dZ;
147 // Inverse bending momentum (vertex resolution + bending slope resolution + 10% error on dipole parameters+field)
148 if (AliMUONTrackExtrap::IsFieldON()) {
149 paramCov(4,4) = ( ( bendingVertexDispersion*bendingVertexDispersion +
150 (z1 * z1 * lastCluster->GetErrY2() + z2 * z2 * firstCluster->GetErrY2()) / dZ / dZ) /
151 bendingImpact / bendingImpact + 0.1 * 0.1) * inverseBendingMomentum * inverseBendingMomentum ;
152 paramCov(2,4) = - z2 * firstCluster->GetErrY2() * inverseBendingMomentum / bendingImpact / dZ;
153 paramCov(4,2) = paramCov(2,4);
154 paramCov(3,4) = - (z1 * lastCluster->GetErrY2() + z2 * firstCluster->GetErrY2()) * inverseBendingMomentum / bendingImpact / dZ / dZ;
155 paramCov(4,3) = paramCov(3,4);
156 } else paramCov(4,4) = inverseBendingMomentum*inverseBendingMomentum;
157 trackParamAtFirstCluster.SetCovariances(paramCov);
159 // Compute and set track parameters covariances at last cluster
161 paramCov(0,0) = lastCluster->GetErrX2();
162 paramCov(0,1) = - lastCluster->GetErrX2() / dZ;
163 paramCov(1,0) = paramCov(0,1);
165 paramCov(2,2) = lastCluster->GetErrY2();
166 paramCov(2,3) = - lastCluster->GetErrY2() / dZ;
167 paramCov(3,2) = paramCov(2,3);
168 // Inverse bending momentum (vertex resolution + bending slope resolution + 10% error on dipole parameters+field)
169 if (AliMUONTrackExtrap::IsFieldON()) {
170 paramCov(2,4) = z1 * lastCluster->GetErrY2() * inverseBendingMomentum / bendingImpact / dZ;
171 paramCov(4,2) = paramCov(2,4);
173 trackParamAtLastCluster.SetCovariances(paramCov);
175 // Add track parameters at clusters
176 AddTrackParamAtCluster(trackParamAtFirstCluster,*firstCluster);
177 AddTrackParamAtCluster(trackParamAtLastCluster,*lastCluster);
181 //__________________________________________________________________________
182 AliMUONTrack::AliMUONTrack(const AliMUONTrack& track)
184 fTrackParamAtCluster(0x0),
185 fFitWithVertex(track.fFitWithVertex),
187 fFitWithMCS(track.fFitWithMCS),
188 fClusterWeightsNonBending(0x0),
189 fClusterWeightsBending(0x0),
190 fGlobalChi2(track.fGlobalChi2),
191 fImproved(track.fImproved),
192 fMatchTrigger(track.fMatchTrigger),
193 fChi2MatchTrigger(track.fChi2MatchTrigger),
194 fTrackID(track.fTrackID),
195 fTrackParamAtVertex(0x0),
196 fHitsPatternInTrigCh(track.fHitsPatternInTrigCh),
197 fLocalTrigger(track.fLocalTrigger),
198 fConnected(track.fConnected)
202 // necessary to make a copy of the objects and not only the pointers in TClonesArray.
203 if (track.fTrackParamAtCluster) {
204 fTrackParamAtCluster = new TClonesArray("AliMUONTrackParam",10);
205 AliMUONTrackParam *trackParamAtCluster = (AliMUONTrackParam*) track.fTrackParamAtCluster->First();
206 while (trackParamAtCluster) {
207 new ((*fTrackParamAtCluster)[GetNClusters()]) AliMUONTrackParam(*trackParamAtCluster);
208 trackParamAtCluster = (AliMUONTrackParam*) track.fTrackParamAtCluster->After(trackParamAtCluster);
212 // copy vertex resolution square used during the tracking procedure
213 fVertexErrXY2[0] = track.fVertexErrXY2[0];
214 fVertexErrXY2[1] = track.fVertexErrXY2[1];
216 // copy cluster weights matrices if any
217 if (track.fClusterWeightsNonBending) fClusterWeightsNonBending = new TMatrixD(*(track.fClusterWeightsNonBending));
218 if (track.fClusterWeightsBending) fClusterWeightsBending = new TMatrixD(*(track.fClusterWeightsBending));
220 // copy track parameters at vertex if any
221 if (track.fTrackParamAtVertex) fTrackParamAtVertex = new AliMUONTrackParam(*(track.fTrackParamAtVertex));
225 //__________________________________________________________________________
226 AliMUONTrack & AliMUONTrack::operator=(const AliMUONTrack& track)
228 /// Asignment operator
229 // check assignement to self
233 // base class assignement
234 TObject::operator=(track);
239 // necessary to make a copy of the objects and not only the pointers in TClonesArray
240 if (track.fTrackParamAtCluster) {
241 fTrackParamAtCluster = new TClonesArray("AliMUONTrackParam",10);
242 AliMUONTrackParam *trackParamAtCluster = (AliMUONTrackParam*) track.fTrackParamAtCluster->First();
243 while (trackParamAtCluster) {
244 new ((*fTrackParamAtCluster)[GetNClusters()]) AliMUONTrackParam(*trackParamAtCluster);
245 trackParamAtCluster = (AliMUONTrackParam*) track.fTrackParamAtCluster->After(trackParamAtCluster);
249 // copy cluster weights matrix if any
250 if (track.fClusterWeightsNonBending) {
251 if (fClusterWeightsNonBending) {
252 fClusterWeightsNonBending->ResizeTo(*(track.fClusterWeightsNonBending));
253 *fClusterWeightsNonBending = *(track.fClusterWeightsNonBending);
254 } else fClusterWeightsNonBending = new TMatrixD(*(track.fClusterWeightsNonBending));
257 // copy cluster weights matrix if any
258 if (track.fClusterWeightsBending) {
259 if (fClusterWeightsBending) {
260 fClusterWeightsBending->ResizeTo(*(track.fClusterWeightsBending));
261 *fClusterWeightsBending = *(track.fClusterWeightsBending);
262 } else fClusterWeightsBending = new TMatrixD(*(track.fClusterWeightsBending));
265 // copy track parameters at vertex if any
266 if (track.fTrackParamAtVertex) {
267 if (fTrackParamAtVertex) *fTrackParamAtVertex = *(track.fTrackParamAtVertex);
268 else fTrackParamAtVertex = new AliMUONTrackParam(*(track.fTrackParamAtVertex));
271 fFitWithVertex = track.fFitWithVertex;
272 fVertexErrXY2[0] = track.fVertexErrXY2[0];
273 fVertexErrXY2[1] = track.fVertexErrXY2[1];
274 fFitWithMCS = track.fFitWithMCS;
275 fGlobalChi2 = track.fGlobalChi2;
276 fImproved = track.fImproved;
277 fMatchTrigger = track.fMatchTrigger;
278 fChi2MatchTrigger = track.fChi2MatchTrigger;
279 fTrackID = track.fTrackID;
280 fHitsPatternInTrigCh = track.fHitsPatternInTrigCh;
281 fLocalTrigger = track.fLocalTrigger;
282 fConnected = track.fConnected;
287 //__________________________________________________________________________
288 AliMUONTrack::~AliMUONTrack()
291 delete fTrackParamAtCluster;
292 delete fClusterWeightsNonBending;
293 delete fClusterWeightsBending;
294 delete fTrackParamAtVertex;
297 //__________________________________________________________________________
298 void AliMUONTrack::Clear(Option_t* opt)
301 if (opt && opt[0] == 'C' && fTrackParamAtCluster) fTrackParamAtCluster->Clear("C");
303 delete fTrackParamAtCluster;
304 fTrackParamAtCluster = 0x0;
306 delete fClusterWeightsNonBending; fClusterWeightsNonBending = 0x0;
307 delete fClusterWeightsBending; fClusterWeightsBending = 0x0;
308 delete fTrackParamAtVertex; fTrackParamAtVertex = 0x0;
311 //__________________________________________________________________________
312 void AliMUONTrack::Reset()
314 /// Reset to default values
316 fFitWithVertex = kFALSE;
317 fVertexErrXY2[0] = 0.;
318 fVertexErrXY2[1] = 0.;
319 fFitWithMCS = kFALSE;
323 fChi2MatchTrigger = 0.;
325 fHitsPatternInTrigCh = 0;
328 delete fTrackParamAtCluster; fTrackParamAtCluster = 0x0;
329 delete fClusterWeightsNonBending; fClusterWeightsNonBending = 0x0;
330 delete fClusterWeightsBending; fClusterWeightsBending = 0x0;
331 delete fTrackParamAtVertex; fTrackParamAtVertex = 0x0;
334 //__________________________________________________________________________
335 TClonesArray* AliMUONTrack::GetTrackParamAtCluster() const
337 /// return array of track parameters at cluster (create it if needed)
338 if (!fTrackParamAtCluster) fTrackParamAtCluster = new TClonesArray("AliMUONTrackParam",10);
339 return fTrackParamAtCluster;
342 //__________________________________________________________________________
343 void AliMUONTrack::AddTrackParamAtCluster(const AliMUONTrackParam &trackParam, AliMUONVCluster &cluster, Bool_t copy)
345 /// Copy given track parameters into a new TrackParamAtCluster
346 /// Link parameters with the associated cluster
347 /// If copy=kTRUE: the cluster is copied then passed the trackParam which become its owner
348 /// otherwise: make sure to do not delete the cluster until it is used by the track
350 // check chamber ID of the associated cluster
351 if (cluster.GetChamberId() < 0 || cluster.GetChamberId() > AliMUONConstants::NTrackingCh()) {
352 AliError(Form("Chamber ID of the associated cluster is not valid (ChamberId=%d)",cluster.GetChamberId()));
356 // check whether track parameters are given at the correct cluster z position
357 if (cluster.GetZ() != trackParam.GetZ()) {
358 AliError("track parameters are given at a different z position than the one of the associated cluster");
362 // add parameters to the array of track parameters
363 if (!fTrackParamAtCluster) fTrackParamAtCluster = new TClonesArray("AliMUONTrackParam",10);
364 AliMUONTrackParam* trackParamAtCluster = new ((*fTrackParamAtCluster)[GetNClusters()]) AliMUONTrackParam(trackParam);
366 // link parameters with the associated cluster or its copy
368 AliMUONVCluster *clusterCopy = static_cast<AliMUONVCluster*>(cluster.Clone());
369 trackParamAtCluster->SetClusterPtr(clusterCopy, kTRUE);
370 } else trackParamAtCluster->SetClusterPtr(&cluster);
372 // sort the array of track parameters
373 fTrackParamAtCluster->Sort();
376 //__________________________________________________________________________
377 void AliMUONTrack::RemoveTrackParamAtCluster(AliMUONTrackParam *trackParam)
379 /// Remove trackParam from the array of TrackParamAtCluster
380 if (!fTrackParamAtCluster || !fTrackParamAtCluster->Remove(trackParam)) {
381 AliWarning("object to remove does not exist in array fTrackParamAtCluster");
385 fTrackParamAtCluster->Compress();
388 //__________________________________________________________________________
389 Bool_t AliMUONTrack::UpdateTrackParamAtCluster()
391 /// Update track parameters at each attached cluster
392 /// Return kFALSE in case of failure (i.e. extrapolation problem)
394 if (GetNClusters() == 0) {
395 AliWarning("no cluster attached to the track");
399 Bool_t extrapStatus = kTRUE;
400 AliMUONTrackParam* startingTrackParam = (AliMUONTrackParam*) fTrackParamAtCluster->First();
401 AliMUONTrackParam* trackParamAtCluster = (AliMUONTrackParam*) fTrackParamAtCluster->After(startingTrackParam);
402 while (trackParamAtCluster) {
404 // reset track parameters and their covariances
405 trackParamAtCluster->SetParameters(startingTrackParam->GetParameters());
406 trackParamAtCluster->SetZ(startingTrackParam->GetZ());
408 // extrapolation to the given z
409 if (!AliMUONTrackExtrap::ExtrapToZ(trackParamAtCluster, trackParamAtCluster->GetClusterPtr()->GetZ())) extrapStatus = kFALSE;
412 startingTrackParam = trackParamAtCluster;
413 trackParamAtCluster = (AliMUONTrackParam*) (fTrackParamAtCluster->After(trackParamAtCluster));
416 // set global chi2 to max value in case of problem during track extrapolation
417 if (!extrapStatus) SetGlobalChi2(2.*MaxChi2());
422 //__________________________________________________________________________
423 Bool_t AliMUONTrack::UpdateCovTrackParamAtCluster()
425 /// Update track parameters and their covariances at each attached cluster
426 /// Include effects of multiple scattering in chambers
427 /// Return kFALSE in case of failure (i.e. extrapolation problem)
429 if (GetNClusters() == 0) {
430 AliWarning("no cluster attached to the track");
434 Bool_t extrapStatus = kTRUE;
435 AliMUONTrackParam* startingTrackParam = (AliMUONTrackParam*) fTrackParamAtCluster->First();
436 AliMUONTrackParam* trackParamAtCluster = (AliMUONTrackParam*) fTrackParamAtCluster->After(startingTrackParam);
437 Int_t expectedChamber = startingTrackParam->GetClusterPtr()->GetChamberId() + 1;
438 Int_t currentChamber;
439 while (trackParamAtCluster) {
441 // reset track parameters and their covariances
442 trackParamAtCluster->SetParameters(startingTrackParam->GetParameters());
443 trackParamAtCluster->SetZ(startingTrackParam->GetZ());
444 trackParamAtCluster->SetCovariances(startingTrackParam->GetCovariances());
447 AliMUONTrackExtrap::AddMCSEffect(trackParamAtCluster,AliMUONConstants::ChamberThicknessInX0(expectedChamber-1),-1.);
449 // add MCS in missing chambers if any
450 currentChamber = trackParamAtCluster->GetClusterPtr()->GetChamberId();
451 while (currentChamber > expectedChamber) {
452 // extrapolation to the missing chamber
453 if (!AliMUONTrackExtrap::ExtrapToZCov(trackParamAtCluster, AliMUONConstants::DefaultChamberZ(expectedChamber))) extrapStatus = kFALSE;
455 AliMUONTrackExtrap::AddMCSEffect(trackParamAtCluster,AliMUONConstants::ChamberThicknessInX0(expectedChamber),-1.);
459 // extrapolation to the z of the current cluster
460 if (!AliMUONTrackExtrap::ExtrapToZCov(trackParamAtCluster, trackParamAtCluster->GetClusterPtr()->GetZ())) extrapStatus = kFALSE;
463 expectedChamber = currentChamber + 1;
464 startingTrackParam = trackParamAtCluster;
465 trackParamAtCluster = (AliMUONTrackParam*) (fTrackParamAtCluster->After(trackParamAtCluster));
468 // set global chi2 to max value in case of problem during track extrapolation
469 if (!extrapStatus) SetGlobalChi2(2.*MaxChi2());
474 //__________________________________________________________________________
475 Bool_t AliMUONTrack::IsValid(UInt_t requestedStationMask, Bool_t request2ChInSameSt45)
477 /// check the validity of the current track:
478 /// at least one cluster per requested station
479 /// and at least 2 chambers in stations 4 & 5 that contain cluster(s)
480 /// + if request2ChInSameSt45 = kTRUE: 2 chambers hit in the same station (4 or 5)
482 Int_t nClusters = GetNClusters();
483 AliMUONTrackParam *trackParam;
484 Int_t currentCh, currentSt, previousCh = -1, nChHitInSt4 = 0, nChHitInSt5 = 0;
485 UInt_t presentStationMask(0);
487 // first loop over clusters
488 for (Int_t i = 0; i < nClusters; i++) {
489 trackParam = (AliMUONTrackParam*) fTrackParamAtCluster->UncheckedAt(i);
491 currentCh = trackParam->GetClusterPtr()->GetChamberId();
492 currentSt = currentCh/2;
494 // build present station mask
495 presentStationMask |= ( 1 << currentSt );
497 // count the number of chambers hit in station 4 that contain cluster(s)
498 if (currentSt == 3 && currentCh != previousCh) {
500 previousCh = currentCh;
503 // count the number of chambers hit in station 5 that contain cluster(s)
504 if (currentSt == 4 && currentCh != previousCh) {
506 previousCh = currentCh;
511 // at least one cluster per requested station
512 if ((requestedStationMask & presentStationMask) != requestedStationMask) return kFALSE;
514 // 2 chambers hit in the same station (4 or 5)
515 if (request2ChInSameSt45) return (nChHitInSt4 == 2 || nChHitInSt5 == 2);
516 // or 2 chambers hit in station 4 & 5 together
517 else return (nChHitInSt4+nChHitInSt5 >= 2);
521 //__________________________________________________________________________
522 void AliMUONTrack::TagRemovableClusters(UInt_t requestedStationMask) {
523 /// Identify clusters that can be removed from the track,
524 /// with the only requirements to have at least 1 cluster per requested station
525 /// and at least 2 chambers over 4 in stations 4 & 5 that contain cluster(s)
527 Int_t nClusters = GetNClusters();
528 AliMUONTrackParam *trackParam, *nextTrackParam;
529 Int_t currentCh, nextCh, currentSt, nextSt, previousCh = -1, nChHitInSt45 = 0;
531 // first loop over clusters
532 for (Int_t i = 0; i < nClusters; i++) {
533 trackParam = (AliMUONTrackParam*) fTrackParamAtCluster->UncheckedAt(i);
535 currentCh = trackParam->GetClusterPtr()->GetChamberId();
536 currentSt = currentCh/2;
538 // reset flags to kFALSE for all clusters in required station
539 if ((1 << currentSt) & requestedStationMask) trackParam->SetRemovable(kFALSE);
540 else trackParam->SetRemovable(kTRUE);
542 // count the number of chambers in station 4 & 5 that contain cluster(s)
543 if (currentCh > 5 && currentCh != previousCh) {
545 previousCh = currentCh;
550 // second loop over clusters
551 for (Int_t i = 0; i < nClusters; i++) {
552 trackParam = (AliMUONTrackParam*) fTrackParamAtCluster->UncheckedAt(i);
554 currentCh = trackParam->GetClusterPtr()->GetChamberId();
555 currentSt = currentCh/2;
557 // make sure they are more than 2 clusters in 2 different chambers of stations 4 & 5
558 // but 2 clusters in he same chamber will still be flagged as removable
559 if (nChHitInSt45 < 3 && currentSt > 2) {
561 if (i == nClusters-1) {
563 trackParam->SetRemovable(kFALSE);
567 nextTrackParam = (AliMUONTrackParam*) fTrackParamAtCluster->UncheckedAt(i+1);
568 nextCh = nextTrackParam->GetClusterPtr()->GetChamberId();
570 // set clusters in the same chamber as being removable
571 if (nextCh == currentCh) {
572 trackParam->SetRemovable(kTRUE);
573 nextTrackParam->SetRemovable(kTRUE);
574 i++; // skip cluster already checked
576 trackParam->SetRemovable(kFALSE);
583 // skip clusters already flag as removable
584 if (trackParam->IsRemovable()) continue;
586 // loop over next track parameters
587 for (Int_t j = i+1; j < nClusters; j++) {
588 nextTrackParam = (AliMUONTrackParam*) fTrackParamAtCluster->UncheckedAt(j);
590 nextCh = nextTrackParam->GetClusterPtr()->GetChamberId();
593 // set clusters in the same station as being removable
594 if (nextSt == currentSt) {
595 trackParam->SetRemovable(kTRUE);
596 nextTrackParam->SetRemovable(kTRUE);
597 i++; // skip cluster already checked
608 //__________________________________________________________________________
609 Bool_t AliMUONTrack::ComputeLocalChi2(Bool_t accountForMCS)
611 /// Compute each cluster contribution to the chi2 of the track
612 /// accounting for multiple scattering or not according to the flag
613 /// - Also recompute the weight matrices of the attached clusters if accountForMCS=kTRUE
614 /// - Assume that track parameters at each cluster are corrects
615 /// - Return kFALSE if computation failed
616 AliDebug(1,"Enter ComputeLocalChi2");
618 if (!fTrackParamAtCluster) {
619 AliWarning("no cluster attached to this track");
623 if (accountForMCS) { // Compute local chi2 taking into account multiple scattering effects
625 // Compute MCS covariance matrix only once
626 Int_t nClusters = GetNClusters();
627 TMatrixD mcsCovariances(nClusters,nClusters);
628 ComputeMCSCovariances(mcsCovariances);
630 // Make sure cluster weights are consistent with following calculations
631 if (!ComputeClusterWeights(&mcsCovariances)) {
632 AliWarning("cannot take into account the multiple scattering effects");
633 return ComputeLocalChi2(kFALSE);
636 // Compute chi2 of the track
637 Double_t globalChi2 = ComputeGlobalChi2(kTRUE);
638 if (globalChi2 < 0.) return kFALSE;
640 // Loop over removable clusters and compute their local chi2
641 AliMUONTrackParam* trackParamAtCluster1;
642 AliMUONVCluster *cluster, *discardedCluster;
643 Int_t iCluster1, iCluster2, iCurrentCluster1, iCurrentCluster2;
644 TMatrixD clusterWeightsNB(nClusters-1,nClusters-1);
645 TMatrixD clusterWeightsB(nClusters-1,nClusters-1);
646 Double_t *dX = new Double_t[nClusters-1];
647 Double_t *dY = new Double_t[nClusters-1];
648 Double_t globalChi2b;
649 AliMUONTrackParam* trackParamAtCluster = (AliMUONTrackParam*) fTrackParamAtCluster->First();
650 while (trackParamAtCluster) {
652 discardedCluster = trackParamAtCluster->GetClusterPtr();
654 // Recompute cluster weights without the current cluster
655 if (!ComputeClusterWeights(clusterWeightsNB, clusterWeightsB, &mcsCovariances, discardedCluster)) {
656 AliWarning("cannot take into account the multiple scattering effects");
659 return ComputeLocalChi2(kFALSE);
662 // Compute track chi2 without the current cluster
664 iCurrentCluster1 = 0;
665 for (iCluster1 = 0; iCluster1 < nClusters ; iCluster1++) {
666 trackParamAtCluster1 = (AliMUONTrackParam*) fTrackParamAtCluster->UncheckedAt(iCluster1);
667 cluster = trackParamAtCluster1->GetClusterPtr();
669 if (cluster == discardedCluster) continue;
671 // Compute and save residuals
672 dX[iCurrentCluster1] = cluster->GetX() - trackParamAtCluster1->GetNonBendingCoor();
673 dY[iCurrentCluster1] = cluster->GetY() - trackParamAtCluster1->GetBendingCoor();
675 iCurrentCluster2 = 0;
676 for (iCluster2 = 0; iCluster2 < iCluster1; iCluster2++) {
677 cluster = ((AliMUONTrackParam*) fTrackParamAtCluster->UncheckedAt(iCluster2))->GetClusterPtr();
679 if (cluster == discardedCluster) continue;
681 // Add contribution from covariances
682 globalChi2b += (clusterWeightsNB(iCurrentCluster1, iCurrentCluster2) +
683 clusterWeightsNB(iCurrentCluster2, iCurrentCluster1)) * dX[iCurrentCluster1] * dX[iCurrentCluster2] +
684 (clusterWeightsB(iCurrentCluster1, iCurrentCluster2) +
685 clusterWeightsB(iCurrentCluster2, iCurrentCluster1)) * dY[iCurrentCluster1] * dY[iCurrentCluster2];
690 // Add contribution from variances
691 globalChi2b += clusterWeightsNB(iCurrentCluster1, iCurrentCluster1) * dX[iCurrentCluster1] * dX[iCurrentCluster1] +
692 clusterWeightsB(iCurrentCluster1, iCurrentCluster1) * dY[iCurrentCluster1] * dY[iCurrentCluster1];
698 trackParamAtCluster->SetLocalChi2(globalChi2 - globalChi2b);
700 trackParamAtCluster = (AliMUONTrackParam*) fTrackParamAtCluster->After(trackParamAtCluster);
706 } else { // without multiple scattering effects
708 AliMUONVCluster *discardedCluster;
710 AliMUONTrackParam* trackParamAtCluster = (AliMUONTrackParam*) fTrackParamAtCluster->First();
711 while (trackParamAtCluster) {
713 discardedCluster = trackParamAtCluster->GetClusterPtr();
716 dX = discardedCluster->GetX() - trackParamAtCluster->GetNonBendingCoor();
717 dY = discardedCluster->GetY() - trackParamAtCluster->GetBendingCoor();
720 trackParamAtCluster->SetLocalChi2(dX * dX / discardedCluster->GetErrX2() + dY * dY / discardedCluster->GetErrY2());
722 trackParamAtCluster = (AliMUONTrackParam*) fTrackParamAtCluster->After(trackParamAtCluster);
731 //__________________________________________________________________________
732 Double_t AliMUONTrack::ComputeGlobalChi2(Bool_t accountForMCS)
734 /// Compute the chi2 of the track accounting for multiple scattering or not according to the flag
735 /// - Assume that track parameters at each cluster are corrects
736 /// - Assume the cluster weights matrices are corrects
737 /// - Return a value of chi2 higher than the maximum allowed if computation failed
738 AliDebug(1,"Enter ComputeGlobalChi2");
740 if (!fTrackParamAtCluster) {
741 AliWarning("no cluster attached to this track");
749 // Check the weight matrices. If weight matrices are not available compute chi2 without MCS
750 if (!fClusterWeightsNonBending || !fClusterWeightsBending) {
751 AliWarning("cluster weights including multiple scattering effects are not available\n\t\t --> compute chi2 WITHOUT multiple scattering");
752 return ComputeGlobalChi2(kFALSE);
754 Int_t nClusters = GetNClusters();
755 if (fClusterWeightsNonBending->GetNrows() != nClusters || fClusterWeightsBending->GetNcols() != nClusters) {
756 AliWarning("cluster weights including multiple scattering effects are not available\n\t\t --> compute chi2 WITHOUT multiple scattering");
757 return ComputeGlobalChi2(kFALSE);
761 AliMUONVCluster *cluster;
762 Double_t *dX = new Double_t[nClusters];
763 Double_t *dY = new Double_t[nClusters];
764 AliMUONTrackParam* trackParamAtCluster;
765 for (Int_t iCluster1 = 0; iCluster1 < nClusters; iCluster1++) {
766 trackParamAtCluster = (AliMUONTrackParam*) fTrackParamAtCluster->UncheckedAt(iCluster1);
767 cluster = trackParamAtCluster->GetClusterPtr();
768 dX[iCluster1] = cluster->GetX() - trackParamAtCluster->GetNonBendingCoor();
769 dY[iCluster1] = cluster->GetY() - trackParamAtCluster->GetBendingCoor();
770 for (Int_t iCluster2 = 0; iCluster2 < iCluster1; iCluster2++) {
771 chi2 += ((*fClusterWeightsNonBending)(iCluster1, iCluster2) + (*fClusterWeightsNonBending)(iCluster2, iCluster1)) * dX[iCluster1] * dX[iCluster2] +
772 ((*fClusterWeightsBending)(iCluster1, iCluster2) + (*fClusterWeightsBending)(iCluster2, iCluster1)) * dY[iCluster1] * dY[iCluster2];
774 chi2 += ((*fClusterWeightsNonBending)(iCluster1, iCluster1) * dX[iCluster1] * dX[iCluster1]) +
775 ((*fClusterWeightsBending)(iCluster1, iCluster1) * dY[iCluster1] * dY[iCluster1]);
782 AliMUONVCluster *cluster;
784 AliMUONTrackParam* trackParamAtCluster;
785 Int_t nClusters = GetNClusters();
786 for (Int_t iCluster = 0; iCluster < nClusters ; iCluster++) {
787 trackParamAtCluster = (AliMUONTrackParam*) fTrackParamAtCluster->UncheckedAt(iCluster);
788 cluster = trackParamAtCluster->GetClusterPtr();
789 dX = cluster->GetX() - trackParamAtCluster->GetNonBendingCoor();
790 dY = cluster->GetY() - trackParamAtCluster->GetBendingCoor();
791 chi2 += dX * dX / cluster->GetErrX2() + dY * dY / cluster->GetErrY2();
800 //__________________________________________________________________________
801 Bool_t AliMUONTrack::ComputeClusterWeights(TMatrixD* mcsCovariances)
803 /// Compute the weight matrices of the attached clusters, in non bending and bending direction,
804 /// accounting for multiple scattering correlations and cluster resolution
805 /// - Use the provided MCS covariance matrix if any (otherwise build it temporarily)
806 /// - Assume that track parameters at each cluster are corrects
807 /// - Return kFALSE if computation failed
808 AliDebug(1,"Enter ComputeClusterWeights1");
810 if (!fTrackParamAtCluster) {
811 AliWarning("no cluster attached to this track");
816 Int_t nClusters = GetNClusters();
817 if (!fClusterWeightsNonBending) fClusterWeightsNonBending = new TMatrixD(nClusters,nClusters);
818 if (!fClusterWeightsBending) fClusterWeightsBending = new TMatrixD(nClusters,nClusters);
820 // Compute weights matrices
821 if (!ComputeClusterWeights(*fClusterWeightsNonBending, *fClusterWeightsBending, mcsCovariances)) return kFALSE;
827 //__________________________________________________________________________
828 Bool_t AliMUONTrack::ComputeClusterWeights(TMatrixD& clusterWeightsNB, TMatrixD& clusterWeightsB,
829 TMatrixD* mcsCovariances, const AliMUONVCluster* discardedCluster) const
831 /// Compute the weight matrices, in non bending and bending direction,
832 /// of the other attached clusters assuming the discarded one does not exist
833 /// accounting for multiple scattering correlations and cluster resolution
834 /// - Use the provided MCS covariance matrix if any (otherwise build it temporarily)
835 /// - Return kFALSE if computation failed
836 AliDebug(1,"Enter ComputeClusterWeights2");
838 // Check MCS covariance matrix and recompute it if need
839 Int_t nClusters = GetNClusters();
840 Bool_t deleteMCSCov = kFALSE;
841 if (!mcsCovariances) {
842 mcsCovariances = new TMatrixD(nClusters,nClusters);
843 deleteMCSCov = kTRUE;
844 ComputeMCSCovariances(*mcsCovariances);
847 // Resize the weights matrices; alocate memory
848 if (discardedCluster) {
849 clusterWeightsNB.ResizeTo(nClusters-1,nClusters-1);
850 clusterWeightsB.ResizeTo(nClusters-1,nClusters-1);
852 clusterWeightsNB.ResizeTo(nClusters,nClusters);
853 clusterWeightsB.ResizeTo(nClusters,nClusters);
857 AliMUONVCluster *cluster1, *cluster2;
858 Int_t iCurrentCluster1, iCurrentCluster2;
860 // Compute the covariance matrices
861 iCurrentCluster1 = 0;
862 for (Int_t iCluster1 = 0; iCluster1 < nClusters; iCluster1++) {
863 cluster1 = ((AliMUONTrackParam*) fTrackParamAtCluster->UncheckedAt(iCluster1))->GetClusterPtr();
865 if (cluster1 == discardedCluster) continue;
867 // Loop over next clusters
868 iCurrentCluster2 = iCurrentCluster1;
869 for (Int_t iCluster2 = iCluster1; iCluster2 < nClusters; iCluster2++) {
870 cluster2 = ((AliMUONTrackParam*) fTrackParamAtCluster->UncheckedAt(iCluster2))->GetClusterPtr();
872 if (cluster2 == discardedCluster) continue;
874 // Fill with MCS covariances
875 clusterWeightsNB(iCurrentCluster1, iCurrentCluster2) = (*mcsCovariances)(iCluster1,iCluster2);
877 // Equal contribution from multiple scattering in non bending and bending directions
878 clusterWeightsB(iCurrentCluster1, iCurrentCluster2) = clusterWeightsNB(iCurrentCluster1, iCurrentCluster2);
880 // Add contribution from cluster resolution to diagonal element and symmetrize the matrix
881 if (iCurrentCluster1 == iCurrentCluster2) {
883 // In non bending plane
884 clusterWeightsNB(iCurrentCluster1, iCurrentCluster1) += cluster1->GetErrX2();
886 clusterWeightsB(iCurrentCluster1, iCurrentCluster1) += cluster1->GetErrY2();
890 // In non bending plane
891 clusterWeightsNB(iCurrentCluster2, iCurrentCluster1) = clusterWeightsNB(iCurrentCluster1, iCurrentCluster2);
893 clusterWeightsB(iCurrentCluster2, iCurrentCluster1) = clusterWeightsB(iCurrentCluster1, iCurrentCluster2);
903 // Inversion of covariance matrices to get the weights
904 if (clusterWeightsNB.Determinant() != 0 && clusterWeightsB.Determinant() != 0) {
905 clusterWeightsNB.Invert();
906 clusterWeightsB.Invert();
908 AliWarning(" Determinant = 0");
909 clusterWeightsNB.ResizeTo(0,0);
910 clusterWeightsB.ResizeTo(0,0);
911 if(deleteMCSCov) delete mcsCovariances;
915 if(deleteMCSCov) delete mcsCovariances;
921 //__________________________________________________________________________
922 void AliMUONTrack::ComputeMCSCovariances(TMatrixD& mcsCovariances) const
924 /// Compute the multiple scattering covariance matrix
925 /// (assume that track parameters at each cluster are corrects)
926 AliDebug(1,"Enter ComputeMCSCovariances");
928 // Reset the size of the covariance matrix if needed
929 Int_t nClusters = GetNClusters();
930 if (mcsCovariances.GetNrows() != nClusters) mcsCovariances.ResizeTo(nClusters,nClusters);
933 Int_t nChambers = AliMUONConstants::NTrackingCh();
934 AliMUONTrackParam* trackParamAtCluster;
935 AliMUONTrackParam extrapTrackParam;
936 Int_t currentChamber = 0, expectedChamber = 0, size = 0;
937 Double_t *mcsAngle2 = new Double_t[2*nChambers];
938 Double_t *zMCS = new Double_t[2*nChambers];
939 Int_t *indices = new Int_t[2*nClusters];
941 // Compute multiple scattering dispersion angle at each chamber
942 // and save the z position where it is calculated
943 for (Int_t iCluster = 0; iCluster < nClusters; iCluster++) {
944 trackParamAtCluster = (AliMUONTrackParam*) fTrackParamAtCluster->UncheckedAt(iCluster);
946 // look for missing chambers if any
947 currentChamber = trackParamAtCluster->GetClusterPtr()->GetChamberId();
948 while (currentChamber > expectedChamber) {
950 // Save the z position where MCS dispersion is calculated
951 zMCS[size] = AliMUONConstants::DefaultChamberZ(expectedChamber);
953 // Do not take into account MCS in chambers prior the first cluster
956 // Get track parameters at missing chamber z
957 extrapTrackParam = *trackParamAtCluster;
958 AliMUONTrackExtrap::ExtrapToZ(&extrapTrackParam, zMCS[size]);
960 // Save multiple scattering dispersion angle in missing chamber
961 mcsAngle2[size] = AliMUONTrackExtrap::GetMCSAngle2(extrapTrackParam,AliMUONConstants::ChamberThicknessInX0(expectedChamber),1.);
963 } else mcsAngle2[size] = 0.;
969 // Save z position where MCS dispersion is calculated
970 zMCS[size] = trackParamAtCluster->GetZ();
972 // Save multiple scattering dispersion angle in current chamber
973 mcsAngle2[size] = AliMUONTrackExtrap::GetMCSAngle2(*trackParamAtCluster,AliMUONConstants::ChamberThicknessInX0(currentChamber),1.);
975 // Save indice in zMCS array corresponding to the current cluster
976 indices[iCluster] = size;
978 expectedChamber = currentChamber + 1;
982 // complete array of z if last cluster is on the last but one chamber
983 if (currentChamber != nChambers-1) zMCS[size++] = AliMUONConstants::DefaultChamberZ(nChambers-1);
985 // Compute the covariance matrix
986 for (Int_t iCluster1 = 0; iCluster1 < nClusters; iCluster1++) {
988 for (Int_t iCluster2 = iCluster1; iCluster2 < nClusters; iCluster2++) {
990 // Initialization to 0 (diagonal plus upper triangular part)
991 mcsCovariances(iCluster1,iCluster2) = 0.;
993 // Compute contribution from multiple scattering in upstream chambers
994 for (Int_t k = 0; k < indices[iCluster1]; k++) {
995 mcsCovariances(iCluster1,iCluster2) += (zMCS[indices[iCluster1]] - zMCS[k]) * (zMCS[indices[iCluster2]] - zMCS[k]) * mcsAngle2[k];
998 // Symetrize the matrix
999 mcsCovariances(iCluster2,iCluster1) = mcsCovariances(iCluster1,iCluster2);
1004 delete [] mcsAngle2;
1010 //__________________________________________________________________________
1011 Int_t AliMUONTrack::ClustersInCommon(AliMUONTrack* track, Int_t stMin, Int_t stMax) const
1013 /// Returns the number of clusters in common in stations [stMin, stMax]
1014 /// between the current track ("this") and the track pointed to by "track".
1016 if (!fTrackParamAtCluster || !this->fTrackParamAtCluster) return 0;
1018 Int_t chMin = 2 * stMin;
1019 Int_t chMax = 2 * stMax + 1;
1020 Int_t clustersInCommon = 0;
1022 // Loop over clusters of first track
1023 Int_t nCl1 = this->GetNClusters();
1024 for(Int_t iCl1 = 0; iCl1 < nCl1; iCl1++) {
1025 AliMUONVCluster* cl1 = ((AliMUONTrackParam*) this->fTrackParamAtCluster->UncheckedAt(iCl1))->GetClusterPtr();
1027 Int_t chCl1 = cl1->GetChamberId();
1028 if (chCl1 < chMin || chCl1 > chMax) continue;
1030 // Loop over clusters of second track
1031 Int_t nCl2 = track->GetNClusters();
1032 for(Int_t iCl2 = 0; iCl2 < nCl2; iCl2++) {
1033 AliMUONVCluster* cl2 = ((AliMUONTrackParam*) track->fTrackParamAtCluster->UncheckedAt(iCl2))->GetClusterPtr();
1035 Int_t chCl2 = cl2->GetChamberId();
1036 if (chCl2 < chMin || chCl2 > chMax) continue;
1038 // Increment "clustersInCommon" if both clusters have the same ID
1039 if (cl1->GetUniqueID() == cl2->GetUniqueID()) {
1048 return clustersInCommon;
1051 //__________________________________________________________________________
1052 Int_t AliMUONTrack::GetNDF() const
1054 /// return the number of degrees of freedom
1056 Int_t ndf = 2 * GetNClusters() - 5;
1057 return (ndf > 0) ? ndf : 0;
1060 //__________________________________________________________________________
1061 Double_t AliMUONTrack::GetNormalizedChi2() const
1063 /// return the chi2 value divided by the number of degrees of freedom (or FLT_MAX if ndf <= 0)
1065 Double_t ndf = (Double_t) GetNDF();
1066 return (ndf > 0.) ? fGlobalChi2 / ndf : 2.*MaxChi2();
1069 //__________________________________________________________________________
1070 Int_t AliMUONTrack::FindCompatibleClusters(const AliMUONTrack &track, Double_t sigmaCut, Bool_t compatibleCluster[10]) const
1072 /// Try to match clusters from this track with clusters from the given track within the provided sigma cut:
1073 /// - Fill the array compatibleCluster[iCh] with kTRUE if a compatible cluster has been found in chamber iCh.
1074 /// - Return the number of clusters of "this" track matched with one cluster of the given track.
1075 AliMUONTrackParam *trackParamAtCluster1, *trackParamAtCluster2;
1076 AliMUONVCluster *cluster1, *cluster2;
1077 Double_t chi2, dX, dY;
1078 Double_t chi2Max = sigmaCut * sigmaCut;
1081 Int_t nMatchClusters = 0;
1082 for ( Int_t ch = 0; ch < AliMUONConstants::NTrackingCh(); ch++) compatibleCluster[ch] = kFALSE;
1084 if (!track.fTrackParamAtCluster || !this->fTrackParamAtCluster) return nMatchClusters;
1086 // Loop over clusters of first track
1087 trackParamAtCluster1 = (AliMUONTrackParam*) this->fTrackParamAtCluster->First();
1088 while (trackParamAtCluster1) {
1090 cluster1 = trackParamAtCluster1->GetClusterPtr();
1092 // Loop over clusters of second track
1093 trackParamAtCluster2 = (AliMUONTrackParam*) track.fTrackParamAtCluster->First();
1094 while (trackParamAtCluster2) {
1096 cluster2 = trackParamAtCluster2->GetClusterPtr();
1099 trackParamAtCluster2 = (AliMUONTrackParam*) track.fTrackParamAtCluster->After(trackParamAtCluster2);
1102 if (cluster1->GetDetElemId() != cluster2->GetDetElemId()) continue;
1105 dX = cluster1->GetX() - cluster2->GetX();
1106 dY = cluster1->GetY() - cluster2->GetY();
1107 chi2 = dX * dX / (cluster1->GetErrX2() + cluster2->GetErrX2()) + dY * dY / (cluster1->GetErrY2() + cluster2->GetErrY2());
1108 if (chi2 > 2. * chi2Max) continue; // 2 because 2 quantities in chi2
1110 compatibleCluster[cluster1->GetChamberId()] = kTRUE;
1115 trackParamAtCluster1 = (AliMUONTrackParam*) this->fTrackParamAtCluster->After(trackParamAtCluster1);
1118 return nMatchClusters;
1121 //__________________________________________________________________________
1122 Bool_t AliMUONTrack::Match(AliMUONTrack &track, Double_t sigmaCut, Int_t &nMatchClusters) const
1124 /// Try to match this track with the given track. Matching conditions:
1125 /// - more than 50% of clusters from this track matched with clusters from the given track
1126 /// - at least 1 cluster matched before and 1 cluster matched after the dipole
1128 Bool_t compTrack[10];
1129 nMatchClusters = FindCompatibleClusters(track, sigmaCut, compTrack);
1131 if ((compTrack[0] || compTrack[1] || compTrack[2] || compTrack[3]) && // at least 1 cluster matched in st 1 & 2
1132 (compTrack[6] || compTrack[7] || compTrack[8] || compTrack[9]) && // at least 1 cluster matched in st 4 & 5
1133 2 * nMatchClusters > GetNClusters()) return kTRUE; // more than 50% of clusters matched
1138 //__________________________________________________________________________
1139 void AliMUONTrack::SetTrackParamAtVertex(const AliMUONTrackParam* trackParam)
1141 /// set track parameters at vertex
1142 if (trackParam == 0x0) return;
1143 if (fTrackParamAtVertex) *fTrackParamAtVertex = *trackParam;
1144 else fTrackParamAtVertex = new AliMUONTrackParam(*trackParam);
1147 //__________________________________________________________________________
1148 void AliMUONTrack::RecursiveDump() const
1150 /// Recursive dump of AliMUONTrack, i.e. with dump of trackParamAtCluster and attached clusters
1151 AliMUONTrackParam *trackParamAtCluster;
1152 AliMUONVCluster *cluster;
1153 cout << "Recursive dump of Track: " << this << endl;
1156 for (Int_t iCluster = 0; iCluster < GetNClusters(); iCluster++) {
1157 trackParamAtCluster = (AliMUONTrackParam*) ((*fTrackParamAtCluster)[iCluster]);
1158 // trackParamAtCluster
1159 cout << "trackParamAtCluster: " << trackParamAtCluster << " (index: " << iCluster << ")" << endl;
1160 trackParamAtCluster->Dump();
1161 cluster = trackParamAtCluster->GetClusterPtr();
1163 cout << "cluster: " << cluster << endl;
1169 //_____________________________________________-
1170 void AliMUONTrack::Print(Option_t*) const
1172 /// Printing Track information
1174 cout << "<AliMUONTrack> No.Clusters=" << setw(2) << GetNClusters() <<
1175 ", Match2Trig=" << setw(1) << GetMatchTrigger() <<
1176 ", LoTrgNum=" << setw(3) << LoCircuit() <<
1177 ", Chi2-tracking-trigger=" << setw(8) << setprecision(5) << GetChi2MatchTrigger();
1178 cout << Form(" HitTriggerPattern %x",fHitsPatternInTrigCh);
1179 cout << Form(" MClabel=%d",fTrackID) << endl;
1180 if (fTrackParamAtCluster) fTrackParamAtCluster->First()->Print("FULL");
1183 //__________________________________________________________________________
1184 void AliMUONTrack::SetLocalTrigger(Int_t loCirc, Int_t loStripX, Int_t loStripY, Int_t loDev, Int_t loLpt, Int_t loHpt, UChar_t respWithoutChamber)
1186 /// pack the local trigger information and store
1188 if (loCirc < 0) return;
1191 fLocalTrigger += loCirc;
1192 fLocalTrigger += loStripX << 8;
1193 fLocalTrigger += loStripY << 13;
1194 fLocalTrigger += loDev << 17;
1195 fLocalTrigger += loLpt << 22;
1196 fLocalTrigger += loHpt << 24;
1197 fLocalTrigger += respWithoutChamber << 26;
1201 //__________________________________________________________________________
1202 void AliMUONTrack::FindMCLabel()
1204 /// Determine the MC label from the label of the attached clusters and fill fMCLabel data member:
1205 /// More than 50% of clusters, including 1 before and 1 after the dipole, must share the same label
1207 Int_t nClusters = GetNClusters();
1208 Int_t halfCluster = nClusters/2;
1213 // loop over first clusters (if nClusters left < (nClusters-halfCluster) the conditions cannot be fulfilled)
1214 for (Int_t iCluster1 = 0; iCluster1 < nClusters-halfCluster; iCluster1++) {
1215 AliMUONVCluster* cluster1 = ((AliMUONTrackParam*) fTrackParamAtCluster->UncheckedAt(iCluster1))->GetClusterPtr();
1217 // if the first cluster is not on station 1 or 2 the conditions cannot be fulfilled
1218 if (cluster1->GetChamberId() > 3) return;
1220 Int_t label1 = cluster1->GetMCLabel();
1221 if (label1 < 0) continue;
1223 Int_t nIdenticalLabel = 1;
1225 // Loop over next clusters
1226 for (Int_t iCluster2 = iCluster1+1; iCluster2 < nClusters; iCluster2++) {
1227 AliMUONVCluster* cluster2 = ((AliMUONTrackParam*) fTrackParamAtCluster->UncheckedAt(iCluster2))->GetClusterPtr();
1229 if (cluster2->GetMCLabel() != label1) continue;
1233 // stop as soon as conditions are fulfilled
1234 if (nIdenticalLabel > halfCluster && cluster2->GetChamberId() > 5) {