code documantation and minor cleanup
[u/mrichter/AliRoot.git] / MUON / AliMUONVTrackReconstructor.cxx
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8d0843c6 1/**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
3 * *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
6 * *
7 * Permission to use, copy, modify and distribute this software and its *
8 * documentation strictly for non-commercial purposes is hereby granted *
9 * without fee, provided that the above copyright notice appears in all *
10 * copies and that both the copyright notice and this permission notice *
11 * appear in the supporting documentation. The authors make no claims *
12 * about the suitability of this software for any purpose. It is *
13 * provided "as is" without express or implied warranty. *
14 **************************************************************************/
15
16/* $Id$ */
17
3d1463c8 18//-----------------------------------------------------------------------------
c4ee792d 19/// \class AliMUONVTrackReconstructor
06ca6d7b 20/// Virtual MUON track reconstructor in ALICE (class renamed from AliMUONEventReconstructor)
21///
96ebe67e 22/// This class contains as data a pointer to the array of reconstructed tracks
06ca6d7b 23///
24/// It contains as methods, among others:
25/// * EventReconstruct to build the muon tracks
26/// * EventReconstructTrigger to build the trigger tracks
96ebe67e 27/// * ValidateTracksWithTrigger to match tracker/trigger tracks
06ca6d7b 28///
96ebe67e 29/// Several options and adjustable parameters are available for both KALMAN and ORIGINAL
30/// tracking algorithms. They can be changed by using:
31/// AliMUONRecoParam *muonRecoParam = AliMUONRecoParam::GetLow(High)FluxParam();
32/// muonRecoParam->Set...(); // see methods in AliMUONRecoParam.h for details
33/// AliMUONReconstructor::SetRecoParam(muonRecoParam);
34///
35/// Main parameters and options are:
dfb547bf 36/// - *fgkSigmaToCutForTracking* : quality cut used to select new clusters to be
37/// attached to the track candidate and to select good tracks.
019df241 38/// - *fgkMakeTrackCandidatesFast* : if this flag is set to 'true', the track candidates
39/// are made assuming linear propagation between stations 4 and 5.
dfb547bf 40/// - *fgkTrackAllTracks* : according to the value of this flag, in case that several
41/// new clusters pass the quality cut, either we consider all the possibilities
42/// (duplicating tracks) or we attach only the best cluster.
43/// - *fgkRecoverTracks* : if this flag is set to 'true', we try to recover the tracks
44/// lost during the tracking by removing the worst of the 2 clusters attached in the
45/// previous station.
46/// - *fgkImproveTracks* : if this flag is set to 'true', we try to improve the quality
47/// of the tracks at the end of the tracking by removing clusters that do not pass
3304fa09 48/// new quality cut (the track is removed is it does not contain enough cluster anymore).
49/// - *fgkComplementTracks* : if this flag is set to 'true', we try to improve the quality
50/// of the tracks at the end of the tracking by adding potentially missing clusters
51/// (we may have 2 clusters in the same chamber because of the overlapping of detection
52/// elements, which is not handle by the tracking algorithm).
dfb547bf 53/// - *fgkSigmaToCutForImprovement* : quality cut used when we try to improve the
54/// quality of the tracks.
55///
c4ee792d 56/// \author Philippe Pillot
3d1463c8 57//-----------------------------------------------------------------------------
8d0843c6 58
8d0843c6 59#include "AliMUONVTrackReconstructor.h"
7ec3b9cf 60
8d0843c6 61#include "AliMUONConstants.h"
208f139e 62#include "AliMUONObjectPair.h"
8d0843c6 63#include "AliMUONTriggerTrack.h"
e1a10d41 64#include "AliMUONTriggerCircuit.h"
8d0843c6 65#include "AliMUONLocalTrigger.h"
66#include "AliMUONGlobalTrigger.h"
8d0843c6 67#include "AliMUONTrack.h"
37827b29 68#include "AliMUONTrackParam.h"
69#include "AliMUONTrackExtrap.h"
7771752e 70#include "AliMUONTrackHitPattern.h"
7ec3b9cf 71#include "AliMUONVTrackStore.h"
72#include "AliMUONVClusterStore.h"
2060b217 73#include "AliMUONVCluster.h"
1fef78c8 74#include "AliMUONVClusterServer.h"
7ec3b9cf 75#include "AliMUONVTriggerStore.h"
76#include "AliMUONVTriggerTrackStore.h"
ea94c18b 77#include "AliMpDEManager.h"
1fef78c8 78#include "AliMpArea.h"
ea94c18b 79
80#include "AliLog.h"
b709ac13 81#include "AliCodeTimer.h"
ea94c18b 82#include "AliTracker.h"
8d0843c6 83
4889d34c 84#include <TClonesArray.h>
85#include <TMath.h>
ea94c18b 86#include <TMatrixD.h>
1fef78c8 87#include <TVector2.h>
ea94c18b 88
89#include <Riostream.h>
4889d34c 90
78649106 91/// \cond CLASSIMP
8d0843c6 92ClassImp(AliMUONVTrackReconstructor) // Class implementation in ROOT context
78649106 93/// \endcond
8d0843c6 94
ea94c18b 95 //__________________________________________________________________________
1fef78c8 96AliMUONVTrackReconstructor::AliMUONVTrackReconstructor(AliMUONVClusterServer& clusterServer)
8d0843c6 97 : TObject(),
8d0843c6 98 fRecTracksPtr(0x0),
1fef78c8 99 fNRecTracks(0),
100 fClusterServer(clusterServer)
8d0843c6 101{
102 /// Constructor for class AliMUONVTrackReconstructor
ea94c18b 103
104 // Memory allocation for the TClonesArray of reconstructed tracks
96ebe67e 105 fRecTracksPtr = new TClonesArray("AliMUONTrack", 100);
7ec3b9cf 106
208f139e 107 // set the magnetic field for track extrapolations
8d0843c6 108 const AliMagF* kField = AliTracker::GetFieldMap();
109 if (!kField) AliFatal("No field available");
37827b29 110 AliMUONTrackExtrap::SetField(kField);
8d0843c6 111}
112
113 //__________________________________________________________________________
ea94c18b 114AliMUONVTrackReconstructor::~AliMUONVTrackReconstructor()
8d0843c6 115{
116 /// Destructor for class AliMUONVTrackReconstructor
ea94c18b 117 delete fRecTracksPtr;
8d0843c6 118}
119
ea94c18b 120 //__________________________________________________________________________
ea94c18b 121void AliMUONVTrackReconstructor::ResetTracks()
122{
123 /// To reset the TClonesArray of reconstructed tracks
124 if (fRecTracksPtr) fRecTracksPtr->Clear("C");
125 fNRecTracks = 0;
126 return;
127}
128
129 //__________________________________________________________________________
1fef78c8 130void AliMUONVTrackReconstructor::EventReconstruct(AliMUONVClusterStore& clusterStore, AliMUONVTrackStore& trackStore)
ea94c18b 131{
132 /// To reconstruct one event
133 AliDebug(1,"");
b709ac13 134 AliCodeTimerAuto("");
ea94c18b 135
96ebe67e 136 // Reset array of tracks
ea94c18b 137 ResetTracks();
2060b217 138
9bf6860b 139 // Look for candidates from clusters in stations(1..) 4 and 5
96ebe67e 140 MakeTrackCandidates(clusterStore);
141
9bf6860b 142 // Look for extra candidates from clusters in stations(1..) 4 and 5
143 if (AliMUONReconstructor::GetRecoParam()->MakeMoreTrackCandidates()) MakeMoreTrackCandidates(clusterStore);
144
96ebe67e 145 // Stop tracking if no candidate found
ea94c18b 146 if (fRecTracksPtr->GetEntriesFast() == 0) return;
96ebe67e 147
ea94c18b 148 // Follow tracks in stations(1..) 3, 2 and 1
96ebe67e 149 FollowTracks(clusterStore);
150
b709ac13 151 // Complement the reconstructed tracks
96ebe67e 152 if (AliMUONReconstructor::GetRecoParam()->ComplementTracks()) ComplementTracks(clusterStore);
153
ea94c18b 154 // Improve the reconstructed tracks
3304fa09 155 if (AliMUONReconstructor::GetRecoParam()->ImproveTracks()) ImproveTracks();
96ebe67e 156
ea94c18b 157 // Remove double tracks
158 RemoveDoubleTracks();
96ebe67e 159
ea94c18b 160 // Fill AliMUONTrack data members
161 Finalize();
96ebe67e 162
163 // Add tracks to MUON data container
164 for (Int_t i=0; i<fNRecTracks; ++i)
165 {
166 AliMUONTrack * track = (AliMUONTrack*) fRecTracksPtr->At(i);
7332f213 167 track->SetUniqueID(i+1);
96ebe67e 168 trackStore.Add(*track);
169 }
ea94c18b 170}
171
172 //__________________________________________________________________________
9bf6860b 173TClonesArray* AliMUONVTrackReconstructor::MakeSegmentsBetweenChambers(const AliMUONVClusterStore& clusterStore, Int_t ch1, Int_t ch2)
8d0843c6 174{
9bf6860b 175 /// To make the list of segments from the list of clusters in the 2 given chambers.
208f139e 176 /// Return a new TClonesArray of segments.
177 /// It is the responsibility of the user to delete it afterward.
9bf6860b 178 AliDebug(1,Form("Enter MakeSegmentsBetweenChambers (1..) %d-%d", ch1+1, ch2+1));
208f139e 179
96ebe67e 180 AliMUONVCluster *cluster1, *cluster2;
208f139e 181 AliMUONObjectPair *segment;
9bf6860b 182 Double_t nonBendingSlope = 0, bendingSlope = 0, impactParam = 0., bendingMomentum = 0.; // to avoid compilation warning
7ec3b9cf 183
96ebe67e 184 // Create iterators to loop over clusters in both chambers
185 TIter nextInCh1(clusterStore.CreateChamberIterator(ch1,ch1));
186 TIter nextInCh2(clusterStore.CreateChamberIterator(ch2,ch2));
187
208f139e 188 // list of segments
96ebe67e 189 TClonesArray *segments = new TClonesArray("AliMUONObjectPair", 100);
7ec3b9cf 190
96ebe67e 191 // Loop over clusters in the first chamber of the station
192 while ( ( cluster1 = static_cast<AliMUONVCluster*>(nextInCh1()) ) ) {
193
194 // reset cluster iterator of chamber 2
195 nextInCh2.Reset();
196
197 // Loop over clusters in the second chamber of the station
198 while ( ( cluster2 = static_cast<AliMUONVCluster*>(nextInCh2()) ) ) {
199
9bf6860b 200 // non bending slope
201 nonBendingSlope = (cluster1->GetX() - cluster2->GetX()) / (cluster1->GetZ() - cluster2->GetZ());
202
96ebe67e 203 // bending slope
204 bendingSlope = (cluster1->GetY() - cluster2->GetY()) / (cluster1->GetZ() - cluster2->GetZ());
205
206 // impact parameter
207 impactParam = cluster1->GetY() - cluster1->GetZ() * bendingSlope;
208
209 // absolute value of bending momentum
210 bendingMomentum = TMath::Abs(AliMUONTrackExtrap::GetBendingMomentumFromImpactParam(impactParam));
211
9bf6860b 212 // check for non bending slope and bending momentum within tolerances
213 if (TMath::Abs(nonBendingSlope) < AliMUONReconstructor::GetRecoParam()->GetMaxNonBendingSlope() &&
214 bendingMomentum < AliMUONReconstructor::GetRecoParam()->GetMaxBendingMomentum() &&
215 bendingMomentum > AliMUONReconstructor::GetRecoParam()->GetMinBendingMomentum()) {
96ebe67e 216
217 // make new segment
218 segment = new ((*segments)[segments->GetLast()+1]) AliMUONObjectPair(cluster1, cluster2, kFALSE, kFALSE);
219
220 // Printout for debug
221 if (AliLog::GetGlobalDebugLevel() > 1) {
7ec3b9cf 222 cout << "segmentIndex(0...): " << segments->GetLast() << endl;
223 segment->Dump();
96ebe67e 224 cout << "Cluster in first chamber" << endl;
225 cluster1->Print();
226 cout << "Cluster in second chamber" << endl;
227 cluster2->Print();
7ec3b9cf 228 }
96ebe67e 229
8d0843c6 230 }
96ebe67e 231
232 }
233
234 }
235
236 // Printout for debug
9bf6860b 237 AliDebug(1,Form("chambers%d-%d: NSegments = %d ", ch1+1, ch2+1, segments->GetEntriesFast()));
96ebe67e 238
208f139e 239 return segments;
8d0843c6 240}
241
ea94c18b 242 //__________________________________________________________________________
243void AliMUONVTrackReconstructor::RemoveIdenticalTracks()
244{
245 /// To remove identical tracks:
96ebe67e 246 /// Tracks are considered identical if they have all their clusters in common.
247 /// One keeps the track with the larger number of clusters if need be
ea94c18b 248 AliMUONTrack *track1, *track2, *trackToRemove;
96ebe67e 249 Int_t clustersInCommon, nClusters1, nClusters2;
ea94c18b 250 Bool_t removedTrack1;
251 // Loop over first track of the pair
252 track1 = (AliMUONTrack*) fRecTracksPtr->First();
253 while (track1) {
254 removedTrack1 = kFALSE;
96ebe67e 255 nClusters1 = track1->GetNClusters();
ea94c18b 256 // Loop over second track of the pair
257 track2 = (AliMUONTrack*) fRecTracksPtr->After(track1);
258 while (track2) {
96ebe67e 259 nClusters2 = track2->GetNClusters();
260 // number of clusters in common between two tracks
261 clustersInCommon = track1->ClustersInCommon(track2);
ea94c18b 262 // check for identical tracks
96ebe67e 263 if ((clustersInCommon == nClusters1) || (clustersInCommon == nClusters2)) {
ea94c18b 264 // decide which track to remove
96ebe67e 265 if (nClusters2 > nClusters1) {
ea94c18b 266 // remove track1 and continue the first loop with the track next to track1
267 trackToRemove = track1;
268 track1 = (AliMUONTrack*) fRecTracksPtr->After(track1);
269 fRecTracksPtr->Remove(trackToRemove);
270 fRecTracksPtr->Compress(); // this is essential to retrieve the TClonesArray afterwards
271 fNRecTracks--;
272 removedTrack1 = kTRUE;
273 break;
274 } else {
275 // remove track2 and continue the second loop with the track next to track2
276 trackToRemove = track2;
277 track2 = (AliMUONTrack*) fRecTracksPtr->After(track2);
278 fRecTracksPtr->Remove(trackToRemove);
279 fRecTracksPtr->Compress(); // this is essential to retrieve the TClonesArray afterwards
280 fNRecTracks--;
281 }
282 } else track2 = (AliMUONTrack*) fRecTracksPtr->After(track2);
283 } // track2
284 if (removedTrack1) continue;
285 track1 = (AliMUONTrack*) fRecTracksPtr->After(track1);
286 } // track1
287 return;
288}
289
290 //__________________________________________________________________________
291void AliMUONVTrackReconstructor::RemoveDoubleTracks()
292{
293 /// To remove double tracks:
96ebe67e 294 /// Tracks are considered identical if more than half of the clusters of the track
295 /// which has the smaller number of clusters are in common with the other track.
296 /// Among two identical tracks, one keeps the track with the larger number of clusters
ea94c18b 297 /// or, if these numbers are equal, the track with the minimum chi2.
298 AliMUONTrack *track1, *track2, *trackToRemove;
96ebe67e 299 Int_t clustersInCommon, nClusters1, nClusters2;
ea94c18b 300 Bool_t removedTrack1;
301 // Loop over first track of the pair
302 track1 = (AliMUONTrack*) fRecTracksPtr->First();
303 while (track1) {
304 removedTrack1 = kFALSE;
96ebe67e 305 nClusters1 = track1->GetNClusters();
ea94c18b 306 // Loop over second track of the pair
307 track2 = (AliMUONTrack*) fRecTracksPtr->After(track1);
308 while (track2) {
96ebe67e 309 nClusters2 = track2->GetNClusters();
310 // number of clusters in common between two tracks
311 clustersInCommon = track1->ClustersInCommon(track2);
ea94c18b 312 // check for identical tracks
96ebe67e 313 if (((nClusters1 < nClusters2) && (2 * clustersInCommon > nClusters1)) || (2 * clustersInCommon > nClusters2)) {
ea94c18b 314 // decide which track to remove
96ebe67e 315 if ((nClusters1 > nClusters2) || ((nClusters1 == nClusters2) && (track1->GetGlobalChi2() <= track2->GetGlobalChi2()))) {
ea94c18b 316 // remove track2 and continue the second loop with the track next to track2
317 trackToRemove = track2;
318 track2 = (AliMUONTrack*) fRecTracksPtr->After(track2);
319 fRecTracksPtr->Remove(trackToRemove);
320 fRecTracksPtr->Compress(); // this is essential to retrieve the TClonesArray afterwards
321 fNRecTracks--;
322 } else {
323 // else remove track1 and continue the first loop with the track next to track1
324 trackToRemove = track1;
325 track1 = (AliMUONTrack*) fRecTracksPtr->After(track1);
326 fRecTracksPtr->Remove(trackToRemove);
327 fRecTracksPtr->Compress(); // this is essential to retrieve the TClonesArray afterwards
328 fNRecTracks--;
329 removedTrack1 = kTRUE;
330 break;
331 }
332 } else track2 = (AliMUONTrack*) fRecTracksPtr->After(track2);
333 } // track2
334 if (removedTrack1) continue;
335 track1 = (AliMUONTrack*) fRecTracksPtr->After(track1);
336 } // track1
337 return;
338}
339
340 //__________________________________________________________________________
9bf6860b 341void AliMUONVTrackReconstructor::AskForNewClustersInChamber(const AliMUONTrackParam &trackParam,
342 AliMUONVClusterStore& clusterStore, Int_t chamber)
1fef78c8 343{
344 /// Ask the clustering to reconstruct new clusters around the track candidate position
1fef78c8 345
9bf6860b 346 // check if the current chamber is useable
347 if (!AliMUONReconstructor::GetRecoParam()->UseChamber(chamber)) return;
1fef78c8 348
9bf6860b 349 // maximum distance between the center of the chamber and a detection element
350 // (accounting for the inclination of the chamber)
351 static const Double_t gkMaxDZ = 15.; // 15 cm
1fef78c8 352
9bf6860b 353 // extrapolate track parameters to the chamber
354 AliMUONTrackParam extrapTrackParam(trackParam);
355 AliMUONTrackExtrap::ExtrapToZCov(&extrapTrackParam, AliMUONConstants::DefaultChamberZ(chamber));
356
357 // build the searching area using the track resolution and the maximum-distance-to-track value
358 const TMatrixD& kParamCov = extrapTrackParam.GetCovariances();
359 Double_t errX2 = kParamCov(0,0) + gkMaxDZ * gkMaxDZ * kParamCov(1,1) + 2. * gkMaxDZ * TMath::Abs(kParamCov(0,1));
360 Double_t errY2 = kParamCov(2,2) + gkMaxDZ * gkMaxDZ * kParamCov(3,3) + 2. * gkMaxDZ * TMath::Abs(kParamCov(2,3));
361 Double_t dX = TMath::Abs(trackParam.GetNonBendingSlope()) * gkMaxDZ +
362 AliMUONReconstructor::GetRecoParam()->GetMaxNonBendingDistanceToTrack() +
363 AliMUONReconstructor::GetRecoParam()->GetSigmaCutForTracking() * TMath::Sqrt(errX2);
364 Double_t dY = TMath::Abs(trackParam.GetBendingSlope()) * gkMaxDZ +
365 AliMUONReconstructor::GetRecoParam()->GetMaxBendingDistanceToTrack() +
366 AliMUONReconstructor::GetRecoParam()->GetSigmaCutForTracking() * TMath::Sqrt(errY2);
367 TVector2 dimensions(dX, dY);
1fef78c8 368 TVector2 position(extrapTrackParam.GetNonBendingCoor(), extrapTrackParam.GetBendingCoor());
9bf6860b 369 AliMpArea area(position, dimensions);
1fef78c8 370
371 // ask to cluterize in the given area of the given chamber
9bf6860b 372 fClusterServer.Clusterize(chamber, clusterStore, area);
1fef78c8 373
9bf6860b 374}
375
376 //__________________________________________________________________________
377void AliMUONVTrackReconstructor::AskForNewClustersInStation(const AliMUONTrackParam &trackParam,
378 AliMUONVClusterStore& clusterStore, Int_t station)
379{
380 /// Ask the clustering to reconstruct new clusters around the track candidate position
381 /// in the 2 chambers of the given station
382 AskForNewClustersInChamber(trackParam, clusterStore, 2*station+1);
383 AskForNewClustersInChamber(trackParam, clusterStore, 2*station);
1fef78c8 384}
385
386 //__________________________________________________________________________
96ebe67e 387Double_t AliMUONVTrackReconstructor::TryOneCluster(const AliMUONTrackParam &trackParam, AliMUONVCluster* cluster,
1fef78c8 388 AliMUONTrackParam &trackParamAtCluster, Bool_t updatePropagator)
ea94c18b 389{
96ebe67e 390/// Test the compatibility between the track and the cluster (using trackParam's covariance matrix):
ea94c18b 391/// return the corresponding Chi2
96ebe67e 392/// return trackParamAtCluster
ea94c18b 393
96ebe67e 394 // extrapolate track parameters and covariances at the z position of the tested cluster
395 trackParamAtCluster = trackParam;
396 AliMUONTrackExtrap::ExtrapToZCov(&trackParamAtCluster, cluster->GetZ(), updatePropagator);
ea94c18b 397
96ebe67e 398 // set pointer to cluster into trackParamAtCluster
399 trackParamAtCluster.SetClusterPtr(cluster);
ea94c18b 400
96ebe67e 401 // Set differences between trackParam and cluster in the bending and non bending directions
402 Double_t dX = cluster->GetX() - trackParamAtCluster.GetNonBendingCoor();
403 Double_t dY = cluster->GetY() - trackParamAtCluster.GetBendingCoor();
ea94c18b 404
019df241 405 // Calculate errors and covariances
96ebe67e 406 const TMatrixD& kParamCov = trackParamAtCluster.GetCovariances();
407 Double_t sigmaX2 = kParamCov(0,0) + cluster->GetErrX2();
408 Double_t sigmaY2 = kParamCov(2,2) + cluster->GetErrY2();
019df241 409
410 // Compute chi2
96ebe67e 411 return dX * dX / sigmaX2 + dY * dY / sigmaY2;
019df241 412
413}
414
415 //__________________________________________________________________________
96ebe67e 416Bool_t AliMUONVTrackReconstructor::TryOneClusterFast(const AliMUONTrackParam &trackParam, AliMUONVCluster* cluster)
019df241 417{
9bf6860b 418/// Test the compatibility between the track and the cluster
419/// given the track resolution + the maximum-distance-to-track value
420/// and assuming linear propagation of the track:
019df241 421/// return kTRUE if they are compatibles
422
96ebe67e 423 Double_t dZ = cluster->GetZ() - trackParam.GetZ();
424 Double_t dX = cluster->GetX() - (trackParam.GetNonBendingCoor() + trackParam.GetNonBendingSlope() * dZ);
425 Double_t dY = cluster->GetY() - (trackParam.GetBendingCoor() + trackParam.GetBendingSlope() * dZ);
9bf6860b 426 const TMatrixD& kParamCov = trackParam.GetCovariances();
427 Double_t errX2 = kParamCov(0,0) + dZ * dZ * kParamCov(1,1) + 2. * dZ * kParamCov(0,1);
428 Double_t errY2 = kParamCov(2,2) + dZ * dZ * kParamCov(3,3) + 2. * dZ * kParamCov(2,3);
429
430 Double_t dXmax = AliMUONReconstructor::GetRecoParam()->GetSigmaCutForTracking() * TMath::Sqrt(errX2) +
431 AliMUONReconstructor::GetRecoParam()->GetMaxNonBendingDistanceToTrack();
432 Double_t dYmax = AliMUONReconstructor::GetRecoParam()->GetSigmaCutForTracking() * TMath::Sqrt(errY2) +
433 AliMUONReconstructor::GetRecoParam()->GetMaxBendingDistanceToTrack();
019df241 434
9bf6860b 435 if (TMath::Abs(dX) > dXmax || TMath::Abs(dY) > dYmax) return kFALSE;
019df241 436
437 return kTRUE;
438
439}
440
441 //__________________________________________________________________________
96ebe67e 442Double_t AliMUONVTrackReconstructor::TryTwoClustersFast(const AliMUONTrackParam &trackParamAtCluster1, AliMUONVCluster* cluster2,
443 AliMUONTrackParam &trackParamAtCluster2)
019df241 444{
96ebe67e 445/// Test the compatibility between the track and the 2 clusters together (using trackParam's covariance matrix)
446/// assuming linear propagation between the two clusters:
447/// return the corresponding Chi2 accounting for covariances between the 2 clusters
448/// return trackParamAtCluster2
019df241 449
96ebe67e 450 // extrapolate linearly track parameters and covariances at the z position of the second cluster
451 trackParamAtCluster2 = trackParamAtCluster1;
452 AliMUONTrackExtrap::LinearExtrapToZ(&trackParamAtCluster2, cluster2->GetZ());
019df241 453
96ebe67e 454 // set pointer to cluster2 into trackParamAtCluster2
455 trackParamAtCluster2.SetClusterPtr(cluster2);
019df241 456
96ebe67e 457 // Set differences between track and clusters in the bending and non bending directions
458 AliMUONVCluster* cluster1 = trackParamAtCluster1.GetClusterPtr();
459 Double_t dX1 = cluster1->GetX() - trackParamAtCluster1.GetNonBendingCoor();
460 Double_t dX2 = cluster2->GetX() - trackParamAtCluster2.GetNonBendingCoor();
461 Double_t dY1 = cluster1->GetY() - trackParamAtCluster1.GetBendingCoor();
462 Double_t dY2 = cluster2->GetY() - trackParamAtCluster2.GetBendingCoor();
019df241 463
464 // Calculate errors and covariances
96ebe67e 465 const TMatrixD& kParamCov1 = trackParamAtCluster1.GetCovariances();
466 const TMatrixD& kParamCov2 = trackParamAtCluster2.GetCovariances();
467 Double_t dZ = trackParamAtCluster2.GetZ() - trackParamAtCluster1.GetZ();
468 Double_t sigma2X1 = kParamCov1(0,0) + cluster1->GetErrX2();
469 Double_t sigma2X2 = kParamCov2(0,0) + cluster2->GetErrX2();
019df241 470 Double_t covX1X2 = kParamCov1(0,0) + dZ * kParamCov1(0,1);
96ebe67e 471 Double_t sigma2Y1 = kParamCov1(2,2) + cluster1->GetErrY2();
472 Double_t sigma2Y2 = kParamCov2(2,2) + cluster2->GetErrY2();
019df241 473 Double_t covY1Y2 = kParamCov1(2,2) + dZ * kParamCov1(2,3);
474
475 // Compute chi2
476 Double_t detX = sigma2X1 * sigma2X2 - covX1X2 * covX1X2;
477 Double_t detY = sigma2Y1 * sigma2Y2 - covY1Y2 * covY1Y2;
478 if (detX == 0. || detY == 0.) return 1.e10;
479 return (dX1 * dX1 * sigma2X2 + dX2 * dX2 * sigma2X1 - 2. * dX1 * dX2 * covX1X2) / detX
480 + (dY1 * dY1 * sigma2Y2 + dY2 * dY2 * sigma2Y1 - 2. * dY1 * dY2 * covY1Y2) / detY;
481
482}
483
484 //__________________________________________________________________________
9bf6860b 485Bool_t AliMUONVTrackReconstructor::FollowLinearTrackInChamber(AliMUONTrack &trackCandidate, const AliMUONVClusterStore& clusterStore,
486 Int_t nextChamber)
487{
488 /// Follow trackCandidate in chamber(0..) nextChamber assuming linear propagation, and search for compatible cluster(s)
489 /// Keep all possibilities or only the best one(s) according to the flag fgkTrackAllTracks:
490 /// kTRUE: duplicate "trackCandidate" if there are several possibilities and add the new tracks at the end of
491 /// fRecTracksPtr to avoid conficts with other track candidates at this current stage of the tracking procedure.
492 /// Remove the obsolete "trackCandidate" at the end.
493 /// kFALSE: add only the best cluster(s) to the "trackCandidate". Try to add a couple of clusters in priority.
494 /// return kTRUE if new cluster(s) have been found (otherwise return kFALSE)
495 AliDebug(1,Form("Enter FollowLinearTrackInChamber(1..) %d", nextChamber+1));
496
497 Double_t chi2WithOneCluster = 1.e10;
498 Double_t maxChi2WithOneCluster = 2. * AliMUONReconstructor::GetRecoParam()->GetSigmaCutForTracking() *
499 AliMUONReconstructor::GetRecoParam()->GetSigmaCutForTracking(); // 2 because 2 quantities in chi2
500 Double_t bestChi2WithOneCluster = maxChi2WithOneCluster;
501 Bool_t foundOneCluster = kFALSE;
502 AliMUONTrack *newTrack = 0x0;
503 AliMUONVCluster *cluster;
504 AliMUONTrackParam trackParam;
505 AliMUONTrackParam extrapTrackParamAtCluster;
506 AliMUONTrackParam bestTrackParamAtCluster;
507
508 // Get track parameters according to the propagation direction
509 if (nextChamber > 7) trackParam = *(AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->Last();
510 else trackParam = *(AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->First();
511
512 // Printout for debuging
513 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 2) || (AliLog::GetGlobalDebugLevel() >= 2)) {
514 cout<<endl<<"Track parameters and covariances at first cluster:"<<endl;
515 trackParam.GetParameters().Print();
516 trackParam.GetCovariances().Print();
517 }
518
519 // Add MCS effect
520 AliMUONTrackExtrap::AddMCSEffect(&trackParam,AliMUONConstants::ChamberThicknessInX0(),1.);
521
522 // Printout for debuging
523 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
524 cout << "FollowLinearTrackInChamber: look for cluster in chamber(1..): " << nextChamber+1 << endl;
525 }
526
527 // Create iterators to loop over clusters in chamber
528 TIter next(clusterStore.CreateChamberIterator(nextChamber,nextChamber));
529
530 // look for candidates in chamber
531 while ( ( cluster = static_cast<AliMUONVCluster*>(next()) ) ) {
532
533 // try to add the current cluster fast
534 if (!TryOneClusterFast(trackParam, cluster)) continue;
535
536 // try to add the current cluster accuratly
537 extrapTrackParamAtCluster = trackParam;
538 AliMUONTrackExtrap::LinearExtrapToZ(&extrapTrackParamAtCluster, cluster->GetZ());
539 chi2WithOneCluster = TryOneCluster(extrapTrackParamAtCluster, cluster, extrapTrackParamAtCluster);
540
541 // if good chi2 then consider to add cluster
542 if (chi2WithOneCluster < maxChi2WithOneCluster) {
543 foundOneCluster = kTRUE;
544
545 // Printout for debuging
546 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
547 cout << "FollowLinearTrackInChamber: found one cluster in chamber(1..): " << nextChamber+1
548 << " (Chi2 = " << chi2WithOneCluster << ")" << endl;
549 cluster->Print();
550 }
551
552 if (AliMUONReconstructor::GetRecoParam()->TrackAllTracks()) {
553 // copy trackCandidate into a new track put at the end of fRecTracksPtr and add the new cluster
554 newTrack = new ((*fRecTracksPtr)[fRecTracksPtr->GetLast()+1]) AliMUONTrack(trackCandidate);
555 if (AliMUONReconstructor::GetRecoParam()->RequestStation(nextChamber/2))
556 extrapTrackParamAtCluster.SetRemovable(kFALSE);
557 else extrapTrackParamAtCluster.SetRemovable(kTRUE);
558 newTrack->AddTrackParamAtCluster(extrapTrackParamAtCluster,*cluster);
559 fNRecTracks++;
560
561 // Printout for debuging
562 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
563 cout << "FollowLinearTrackInChamber: added one cluster in chamber(1..): " << nextChamber+1 << endl;
564 if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump();
565 }
566
567 } else if (chi2WithOneCluster < bestChi2WithOneCluster) {
568 // keep track of the best cluster
569 bestChi2WithOneCluster = chi2WithOneCluster;
570 bestTrackParamAtCluster = extrapTrackParamAtCluster;
571 }
572
573 }
574
575 }
576
577 // fill out the best track if required else clean up the fRecTracksPtr array
578 if (!AliMUONReconstructor::GetRecoParam()->TrackAllTracks()) {
579 if (foundOneCluster) {
580 if (AliMUONReconstructor::GetRecoParam()->RequestStation(nextChamber/2))
581 bestTrackParamAtCluster.SetRemovable(kFALSE);
582 else bestTrackParamAtCluster.SetRemovable(kTRUE);
583 trackCandidate.AddTrackParamAtCluster(bestTrackParamAtCluster,*(bestTrackParamAtCluster.GetClusterPtr()));
584
585 // Printout for debuging
586 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
587 cout << "FollowLinearTrackInChamber: added the best cluster in chamber(1..): " << bestTrackParamAtCluster.GetClusterPtr()->GetChamberId()+1 << endl;
588 if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump();
589 }
590
591 } else return kFALSE;
592
593 } else if (foundOneCluster) {
594
595 // remove obsolete track
596 fRecTracksPtr->Remove(&trackCandidate);
597 fNRecTracks--;
598
599 } else return kFALSE;
600
601 return kTRUE;
602
603}
604
605//__________________________________________________________________________
96ebe67e 606Bool_t AliMUONVTrackReconstructor::FollowLinearTrackInStation(AliMUONTrack &trackCandidate, const AliMUONVClusterStore& clusterStore,
607 Int_t nextStation)
019df241 608{
96ebe67e 609 /// Follow trackCandidate in station(0..) nextStation assuming linear propagation, and search for compatible cluster(s)
019df241 610 /// Keep all possibilities or only the best one(s) according to the flag fgkTrackAllTracks:
611 /// kTRUE: duplicate "trackCandidate" if there are several possibilities and add the new tracks at the end of
612 /// fRecTracksPtr to avoid conficts with other track candidates at this current stage of the tracking procedure.
613 /// Remove the obsolete "trackCandidate" at the end.
96ebe67e 614 /// kFALSE: add only the best cluster(s) to the "trackCandidate". Try to add a couple of clusters in priority.
615 /// return kTRUE if new cluster(s) have been found (otherwise return kFALSE)
019df241 616 AliDebug(1,Form("Enter FollowLinearTrackInStation(1..) %d", nextStation+1));
617
618 // Order the chamber according to the propagation direction (tracking starts with chamber 2):
619 // - nextStation == station(1...) 5 => forward propagation
620 // - nextStation < station(1...) 5 => backward propagation
621 Int_t ch1, ch2;
622 if (nextStation==4) {
623 ch1 = 2*nextStation+1;
624 ch2 = 2*nextStation;
ea94c18b 625 } else {
019df241 626 ch1 = 2*nextStation;
627 ch2 = 2*nextStation+1;
ea94c18b 628 }
629
96ebe67e 630 Double_t chi2WithOneCluster = 1.e10;
631 Double_t chi2WithTwoClusters = 1.e10;
632 Double_t maxChi2WithOneCluster = 2. * AliMUONReconstructor::GetRecoParam()->GetSigmaCutForTracking() *
633 AliMUONReconstructor::GetRecoParam()->GetSigmaCutForTracking(); // 2 because 2 quantities in chi2
634 Double_t maxChi2WithTwoClusters = 4. * AliMUONReconstructor::GetRecoParam()->GetSigmaCutForTracking() *
635 AliMUONReconstructor::GetRecoParam()->GetSigmaCutForTracking(); // 4 because 4 quantities in chi2
636 Double_t bestChi2WithOneCluster = maxChi2WithOneCluster;
637 Double_t bestChi2WithTwoClusters = maxChi2WithTwoClusters;
638 Bool_t foundOneCluster = kFALSE;
639 Bool_t foundTwoClusters = kFALSE;
019df241 640 AliMUONTrack *newTrack = 0x0;
96ebe67e 641 AliMUONVCluster *clusterCh1, *clusterCh2;
7332f213 642 AliMUONTrackParam trackParam;
96ebe67e 643 AliMUONTrackParam extrapTrackParamAtCluster1;
644 AliMUONTrackParam extrapTrackParamAtCluster2;
645 AliMUONTrackParam bestTrackParamAtCluster1;
646 AliMUONTrackParam bestTrackParamAtCluster2;
647
648 Int_t nClusters = clusterStore.GetSize();
649 Bool_t *clusterCh1Used = new Bool_t[nClusters];
650 for (Int_t i = 0; i < nClusters; i++) clusterCh1Used[i] = kFALSE;
651 Int_t iCluster1;
019df241 652
7332f213 653 // Get track parameters according to the propagation direction
654 if (nextStation==4) trackParam = *(AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->Last();
655 else trackParam = *(AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->First();
019df241 656
9bf6860b 657 // Printout for debuging
658 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 2) || (AliLog::GetGlobalDebugLevel() >= 2)) {
659 cout<<endl<<"Track parameters and covariances at first cluster:"<<endl;
660 trackParam.GetParameters().Print();
661 trackParam.GetCovariances().Print();
662 }
663
019df241 664 // Add MCS effect
665 AliMUONTrackExtrap::AddMCSEffect(&trackParam,AliMUONConstants::ChamberThicknessInX0(),1.);
666
667 // Printout for debuging
668 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
96ebe67e 669 cout << "FollowLinearTrackInStation: look for clusters in chamber(1..): " << ch2+1 << endl;
019df241 670 }
671
96ebe67e 672 // Create iterators to loop over clusters in both chambers
673 TIter nextInCh1(clusterStore.CreateChamberIterator(ch1,ch1));
674 TIter nextInCh2(clusterStore.CreateChamberIterator(ch2,ch2));
675
676 // look for candidates in chamber 2
677 while ( ( clusterCh2 = static_cast<AliMUONVCluster*>(nextInCh2()) ) ) {
019df241 678
96ebe67e 679 // try to add the current cluster fast
680 if (!TryOneClusterFast(trackParam, clusterCh2)) continue;
019df241 681
96ebe67e 682 // try to add the current cluster accuratly
683 extrapTrackParamAtCluster2 = trackParam;
684 AliMUONTrackExtrap::LinearExtrapToZ(&extrapTrackParamAtCluster2, clusterCh2->GetZ());
685 chi2WithOneCluster = TryOneCluster(extrapTrackParamAtCluster2, clusterCh2, extrapTrackParamAtCluster2);
019df241 686
96ebe67e 687 // if good chi2 then try to attach a cluster in the other chamber too
688 if (chi2WithOneCluster < maxChi2WithOneCluster) {
689 Bool_t foundSecondCluster = kFALSE;
019df241 690
691 // Printout for debuging
692 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
96ebe67e 693 cout << "FollowLinearTrackInStation: found one cluster in chamber(1..): " << ch2+1
694 << " (Chi2 = " << chi2WithOneCluster << ")" << endl;
9bf6860b 695 clusterCh2->Print();
96ebe67e 696 cout << " look for second clusters in chamber(1..): " << ch1+1 << " ..." << endl;
019df241 697 }
698
699 // add MCS effect
96ebe67e 700 AliMUONTrackExtrap::AddMCSEffect(&extrapTrackParamAtCluster2,AliMUONConstants::ChamberThicknessInX0(),1.);
019df241 701
96ebe67e 702 // reset cluster iterator of chamber 1
703 nextInCh1.Reset();
704 iCluster1 = -1;
705
706 // look for second candidates in chamber 1
707 while ( ( clusterCh1 = static_cast<AliMUONVCluster*>(nextInCh1()) ) ) {
708 iCluster1++;
019df241 709
96ebe67e 710 // try to add the current cluster fast
711 if (!TryOneClusterFast(extrapTrackParamAtCluster2, clusterCh1)) continue;
019df241 712
96ebe67e 713 // try to add the current cluster in addition to the one found in the previous chamber
714 chi2WithTwoClusters = TryTwoClustersFast(extrapTrackParamAtCluster2, clusterCh1, extrapTrackParamAtCluster1);
019df241 715
96ebe67e 716 // if good chi2 then consider to add the 2 clusters to the "trackCandidate"
717 if (chi2WithTwoClusters < maxChi2WithTwoClusters) {
718 foundSecondCluster = kTRUE;
719 foundTwoClusters = kTRUE;
019df241 720
721 // Printout for debuging
722 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
96ebe67e 723 cout << "FollowLinearTrackInStation: found one cluster in chamber(1..): " << ch1+1
9bf6860b 724 << " (Chi2 = " << chi2WithTwoClusters << ")" << endl;
725 clusterCh1->Print();
019df241 726 }
727
3304fa09 728 if (AliMUONReconstructor::GetRecoParam()->TrackAllTracks()) {
96ebe67e 729 // copy trackCandidate into a new track put at the end of fRecTracksPtr and add the new clusters
019df241 730 newTrack = new ((*fRecTracksPtr)[fRecTracksPtr->GetLast()+1]) AliMUONTrack(trackCandidate);
96ebe67e 731 extrapTrackParamAtCluster1.SetRemovable(kTRUE);
732 newTrack->AddTrackParamAtCluster(extrapTrackParamAtCluster1,*clusterCh1);
733 extrapTrackParamAtCluster2.SetRemovable(kTRUE);
734 newTrack->AddTrackParamAtCluster(extrapTrackParamAtCluster2,*clusterCh2);
019df241 735 fNRecTracks++;
736
96ebe67e 737 // Tag clusterCh1 as used
738 clusterCh1Used[iCluster1] = kTRUE;
019df241 739
740 // Printout for debuging
741 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
96ebe67e 742 cout << "FollowLinearTrackInStation: added two clusters in station(1..): " << nextStation+1 << endl;
019df241 743 if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump();
744 }
745
96ebe67e 746 } else if (chi2WithTwoClusters < bestChi2WithTwoClusters) {
747 // keep track of the best couple of clusters
748 bestChi2WithTwoClusters = chi2WithTwoClusters;
749 bestTrackParamAtCluster1 = extrapTrackParamAtCluster1;
750 bestTrackParamAtCluster2 = extrapTrackParamAtCluster2;
019df241 751 }
752
753 }
754
755 }
756
96ebe67e 757 // if no cluster found in chamber1 then consider to add clusterCh2 only
758 if (!foundSecondCluster) {
759 foundOneCluster = kTRUE;
019df241 760
3304fa09 761 if (AliMUONReconstructor::GetRecoParam()->TrackAllTracks()) {
96ebe67e 762 // copy trackCandidate into a new track put at the end of fRecTracksPtr and add the new cluster
019df241 763 newTrack = new ((*fRecTracksPtr)[fRecTracksPtr->GetLast()+1]) AliMUONTrack(trackCandidate);
9bf6860b 764 if (AliMUONReconstructor::GetRecoParam()->RequestStation(nextStation))
765 extrapTrackParamAtCluster2.SetRemovable(kFALSE);
766 else extrapTrackParamAtCluster2.SetRemovable(kTRUE);
96ebe67e 767 newTrack->AddTrackParamAtCluster(extrapTrackParamAtCluster2,*clusterCh2);
019df241 768 fNRecTracks++;
769
770 // Printout for debuging
771 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
96ebe67e 772 cout << "FollowLinearTrackInStation: added one cluster in chamber(1..): " << ch2+1 << endl;
019df241 773 if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump();
774 }
775
96ebe67e 776 } else if (!foundTwoClusters && chi2WithOneCluster < bestChi2WithOneCluster) {
777 // keep track of the best cluster except if a couple of clusters has already been found
778 bestChi2WithOneCluster = chi2WithOneCluster;
779 bestTrackParamAtCluster1 = extrapTrackParamAtCluster2;
019df241 780 }
781
782 }
783
784 }
785
786 }
787
788 // look for candidates in chamber 1 not already attached to a track
96ebe67e 789 // if we want to keep all possible tracks or if no good couple of clusters has been found
790 if (AliMUONReconstructor::GetRecoParam()->TrackAllTracks() || !foundTwoClusters) {
019df241 791
792 // Printout for debuging
793 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
96ebe67e 794 cout << "FollowLinearTrackInStation: look for single cluster in chamber(1..): " << ch1+1 << endl;
019df241 795 }
796
797 //Extrapolate trackCandidate to chamber "ch2"
798 AliMUONTrackExtrap::LinearExtrapToZ(&trackParam, AliMUONConstants::DefaultChamberZ(ch2));
799
800 // add MCS effect for next step
801 AliMUONTrackExtrap::AddMCSEffect(&trackParam,AliMUONConstants::ChamberThicknessInX0(),1.);
9bf6860b 802
96ebe67e 803 // reset cluster iterator of chamber 1
804 nextInCh1.Reset();
805 iCluster1 = -1;
806
807 // look for second candidates in chamber 1
808 while ( ( clusterCh1 = static_cast<AliMUONVCluster*>(nextInCh1()) ) ) {
809 iCluster1++;
019df241 810
96ebe67e 811 if (clusterCh1Used[iCluster1]) continue; // Skip clusters already used
019df241 812
96ebe67e 813 // try to add the current cluster fast
814 if (!TryOneClusterFast(trackParam, clusterCh1)) continue;
9bf6860b 815
96ebe67e 816 // try to add the current cluster accuratly
817 extrapTrackParamAtCluster1 = trackParam;
818 AliMUONTrackExtrap::LinearExtrapToZ(&extrapTrackParamAtCluster1, clusterCh1->GetZ());
819 chi2WithOneCluster = TryOneCluster(extrapTrackParamAtCluster1, clusterCh1, extrapTrackParamAtCluster1);
9bf6860b 820
96ebe67e 821 // if good chi2 then consider to add clusterCh1
822 // We do not try to attach a cluster in the other chamber too since it has already been done above
823 if (chi2WithOneCluster < maxChi2WithOneCluster) {
824 foundOneCluster = kTRUE;
019df241 825
826 // Printout for debuging
827 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
96ebe67e 828 cout << "FollowLinearTrackInStation: found one cluster in chamber(1..): " << ch1+1
829 << " (Chi2 = " << chi2WithOneCluster << ")" << endl;
9bf6860b 830 clusterCh1->Print();
019df241 831 }
832
3304fa09 833 if (AliMUONReconstructor::GetRecoParam()->TrackAllTracks()) {
96ebe67e 834 // copy trackCandidate into a new track put at the end of fRecTracksPtr and add the new cluster
019df241 835 newTrack = new ((*fRecTracksPtr)[fRecTracksPtr->GetLast()+1]) AliMUONTrack(trackCandidate);
9bf6860b 836 if (AliMUONReconstructor::GetRecoParam()->RequestStation(nextStation))
837 extrapTrackParamAtCluster1.SetRemovable(kFALSE);
838 else extrapTrackParamAtCluster1.SetRemovable(kTRUE);
96ebe67e 839 newTrack->AddTrackParamAtCluster(extrapTrackParamAtCluster1,*clusterCh1);
019df241 840 fNRecTracks++;
841
842 // Printout for debuging
843 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
96ebe67e 844 cout << "FollowLinearTrackInStation: added one cluster in chamber(1..): " << ch1+1 << endl;
019df241 845 if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump();
846 }
847
96ebe67e 848 } else if (chi2WithOneCluster < bestChi2WithOneCluster) {
849 // keep track of the best cluster except if a couple of clusters has already been found
850 bestChi2WithOneCluster = chi2WithOneCluster;
851 bestTrackParamAtCluster1 = extrapTrackParamAtCluster1;
019df241 852 }
853
854 }
855
856 }
857
858 }
859
860 // fill out the best track if required else clean up the fRecTracksPtr array
3304fa09 861 if (!AliMUONReconstructor::GetRecoParam()->TrackAllTracks()) {
96ebe67e 862 if (foundTwoClusters) {
863 bestTrackParamAtCluster1.SetRemovable(kTRUE);
864 trackCandidate.AddTrackParamAtCluster(bestTrackParamAtCluster1,*(bestTrackParamAtCluster1.GetClusterPtr()));
865 bestTrackParamAtCluster2.SetRemovable(kTRUE);
866 trackCandidate.AddTrackParamAtCluster(bestTrackParamAtCluster2,*(bestTrackParamAtCluster2.GetClusterPtr()));
019df241 867
868 // Printout for debuging
869 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
96ebe67e 870 cout << "FollowLinearTrackInStation: added the two best clusters in station(1..): " << nextStation+1 << endl;
019df241 871 if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump();
872 }
873
96ebe67e 874 } else if (foundOneCluster) {
9bf6860b 875 if (AliMUONReconstructor::GetRecoParam()->RequestStation(nextStation))
876 bestTrackParamAtCluster1.SetRemovable(kFALSE);
877 else bestTrackParamAtCluster1.SetRemovable(kTRUE);
96ebe67e 878 trackCandidate.AddTrackParamAtCluster(bestTrackParamAtCluster1,*(bestTrackParamAtCluster1.GetClusterPtr()));
019df241 879
880 // Printout for debuging
881 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
96ebe67e 882 cout << "FollowLinearTrackInStation: added the best cluster in chamber(1..): " << bestTrackParamAtCluster1.GetClusterPtr()->GetChamberId()+1 << endl;
019df241 883 if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump();
884 }
885
dd230855 886 } else {
96ebe67e 887 delete [] clusterCh1Used;
dd230855 888 return kFALSE;
889 }
019df241 890
96ebe67e 891 } else if (foundOneCluster || foundTwoClusters) {
019df241 892
893 // remove obsolete track
894 fRecTracksPtr->Remove(&trackCandidate);
895 fNRecTracks--;
896
dd230855 897 } else {
96ebe67e 898 delete [] clusterCh1Used;
dd230855 899 return kFALSE;
900 }
ea94c18b 901
96ebe67e 902 delete [] clusterCh1Used;
019df241 903 return kTRUE;
ea94c18b 904
905}
906
7332f213 907//__________________________________________________________________________
908void AliMUONVTrackReconstructor::ImproveTracks()
909{
910 /// Improve tracks by removing clusters with local chi2 highter than the defined cut
911 /// Recompute track parameters and covariances at the remaining clusters
912 AliDebug(1,"Enter ImproveTracks");
913
914 AliMUONTrack *track, *nextTrack;
915
7332f213 916 track = (AliMUONTrack*) fRecTracksPtr->First();
917 while (track) {
918
919 // prepare next track in case the actual track is suppressed
920 nextTrack = (AliMUONTrack*) fRecTracksPtr->After(track);
921
922 ImproveTrack(*track);
923
924 // remove track if improvement failed
925 if (!track->IsImproved()) {
926 fRecTracksPtr->Remove(track);
927 fNRecTracks--;
928 }
929
930 track = nextTrack;
931 }
932
933 // compress the array in case of some tracks have been removed
934 fRecTracksPtr->Compress();
935
936}
937
938//__________________________________________________________________________
939void AliMUONVTrackReconstructor::Finalize()
940{
941 /// Recompute track parameters and covariances at each attached cluster from those at the first one
942
943 AliMUONTrack *track;
944
945 track = (AliMUONTrack*) fRecTracksPtr->First();
946 while (track) {
947
948 FinalizeTrack(*track);
949
950 track = (AliMUONTrack*) fRecTracksPtr->After(track);
951
952 }
953
954}
955
956//__________________________________________________________________________
7ec3b9cf 957void AliMUONVTrackReconstructor::ValidateTracksWithTrigger(AliMUONVTrackStore& trackStore,
958 const AliMUONVTriggerTrackStore& triggerTrackStore,
959 const AliMUONVTriggerStore& triggerStore,
960 const AliMUONTrackHitPattern& trackHitPattern)
8d0843c6 961{
962 /// Try to match track from tracking system with trigger track
b709ac13 963 AliCodeTimerAuto("");
fda59e58 964
683cb6c5 965 trackHitPattern.ExecuteValidation(trackStore, triggerTrackStore, triggerStore);
8d0843c6 966}
967
ea94c18b 968 //__________________________________________________________________________
969void AliMUONVTrackReconstructor::EventReconstructTrigger(const AliMUONTriggerCircuit& circuit,
970 const AliMUONVTriggerStore& triggerStore,
971 AliMUONVTriggerTrackStore& triggerTrackStore)
8d0843c6 972{
71a2d3aa 973 /// To make the trigger tracks from Local Trigger
7ec3b9cf 974 AliDebug(1, "");
b709ac13 975 AliCodeTimerAuto("");
7ec3b9cf 976
977 AliMUONGlobalTrigger* globalTrigger = triggerStore.Global();
e6b25a6e 978
7ec3b9cf 979 UChar_t gloTrigPat = 0;
e6b25a6e 980
7ec3b9cf 981 if (globalTrigger)
982 {
983 gloTrigPat = globalTrigger->GetGlobalResponse();
e6b25a6e 984 }
985
7ec3b9cf 986 TIter next(triggerStore.CreateIterator());
987 AliMUONLocalTrigger* locTrg(0x0);
8d0843c6 988
e6b25a6e 989 Float_t z11 = AliMUONConstants::DefaultChamberZ(10);
990 Float_t z21 = AliMUONConstants::DefaultChamberZ(12);
7cf63da6 991
7ec3b9cf 992 AliMUONTriggerTrack triggerTrack;
993
994 while ( ( locTrg = static_cast<AliMUONLocalTrigger*>(next()) ) )
995 {
d72d7b9e 996 Bool_t xTrig=locTrg->IsTrigX();
997 Bool_t yTrig=locTrg->IsTrigY();
7ec3b9cf 998
32ab62c9 999 Int_t localBoardId = locTrg->LoCircuit();
7ec3b9cf 1000
1001 if (xTrig && yTrig)
1002 { // make Trigger Track if trigger in X and Y
8b0baca4 1003
32ab62c9 1004 Float_t y11 = circuit.GetY11Pos(localBoardId, locTrg->LoStripX());
7ec3b9cf 1005 // need first to convert deviation to [0-30]
1006 // (see AliMUONLocalTriggerBoard::LocalTrigger)
d72d7b9e 1007 Int_t deviation = locTrg->GetDeviation();
7ec3b9cf 1008 Int_t stripX21 = locTrg->LoStripX()+deviation+1;
32ab62c9 1009 Float_t y21 = circuit.GetY21Pos(localBoardId, stripX21);
1010 Float_t x11 = circuit.GetX11Pos(localBoardId, locTrg->LoStripY());
7ec3b9cf 1011
1012 AliDebug(1, Form(" MakeTriggerTrack %d %d %d %d %f %f %f \n",locTrg->LoCircuit(),
1013 locTrg->LoStripX(),locTrg->LoStripX()+locTrg->LoDev()+1,locTrg->LoStripY(),y11, y21, x11));
1014
1015 Float_t thetax = TMath::ATan2( x11 , z11 );
1016 Float_t thetay = TMath::ATan2( (y21-y11) , (z21-z11) );
1017
1018 triggerTrack.SetX11(x11);
1019 triggerTrack.SetY11(y11);
1020 triggerTrack.SetThetax(thetax);
1021 triggerTrack.SetThetay(thetay);
1022 triggerTrack.SetGTPattern(gloTrigPat);
32ab62c9 1023 triggerTrack.SetLoTrgNum(localBoardId);
7ec3b9cf 1024
1025 triggerTrackStore.Add(triggerTrack);
1026 } // board is fired
e6b25a6e 1027 } // end of loop on Local Trigger
8d0843c6 1028}
ea94c18b 1029