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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 | 92 | ClassImp(AliMUONVTrackReconstructor) // Class implementation in ROOT context |
78649106 | 93 | /// \endcond |
8d0843c6 | 94 | |
ea94c18b | 95 | //__________________________________________________________________________ |
1fef78c8 | 96 | AliMUONVTrackReconstructor::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 | 114 | AliMUONVTrackReconstructor::~AliMUONVTrackReconstructor() |
8d0843c6 | 115 | { |
116 | /// Destructor for class AliMUONVTrackReconstructor | |
ea94c18b | 117 | delete fRecTracksPtr; |
8d0843c6 | 118 | } |
119 | ||
ea94c18b | 120 | //__________________________________________________________________________ |
121 | void 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 | 130 | void 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 | ||
8d0843c6 | 172 | //__________________________________________________________________________ |
9bf6860b | 173 | TClonesArray* 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 | ||
9f093251 | 203 | // check if non bending slope is within tolerances |
204 | if (TMath::Abs(nonBendingSlope) > AliMUONReconstructor::GetRecoParam()->GetMaxNonBendingSlope()) continue; | |
205 | ||
96ebe67e | 206 | // bending slope |
207 | bendingSlope = (cluster1->GetY() - cluster2->GetY()) / (cluster1->GetZ() - cluster2->GetZ()); | |
208 | ||
9f093251 | 209 | // check the bending momentum of the bending slope depending if the field is ON or OFF |
210 | if (AliMUONTrackExtrap::IsFieldON()) { | |
211 | ||
212 | // impact parameter | |
213 | impactParam = cluster1->GetY() - cluster1->GetZ() * bendingSlope; | |
214 | ||
215 | // absolute value of bending momentum | |
216 | bendingMomentum = TMath::Abs(AliMUONTrackExtrap::GetBendingMomentumFromImpactParam(impactParam)); | |
217 | ||
218 | // check if bending momentum is within tolerances | |
219 | if (bendingMomentum < AliMUONReconstructor::GetRecoParam()->GetMinBendingMomentum() || | |
220 | bendingMomentum > AliMUONReconstructor::GetRecoParam()->GetMaxBendingMomentum()) continue; | |
96ebe67e | 221 | |
9f093251 | 222 | } else { |
223 | ||
224 | // check if non bending slope is within tolerances | |
225 | if (TMath::Abs(bendingSlope) > AliMUONReconstructor::GetRecoParam()->GetMaxBendingSlope()) continue; | |
226 | ||
227 | } | |
228 | // make new segment | |
229 | segment = new ((*segments)[segments->GetLast()+1]) AliMUONObjectPair(cluster1, cluster2, kFALSE, kFALSE); | |
230 | ||
231 | // Printout for debug | |
232 | if (AliLog::GetGlobalDebugLevel() > 1) { | |
233 | cout << "segmentIndex(0...): " << segments->GetLast() << endl; | |
234 | segment->Dump(); | |
235 | cout << "Cluster in first chamber" << endl; | |
236 | cluster1->Print(); | |
237 | cout << "Cluster in second chamber" << endl; | |
238 | cluster2->Print(); | |
8d0843c6 | 239 | } |
96ebe67e | 240 | |
241 | } | |
242 | ||
243 | } | |
244 | ||
245 | // Printout for debug | |
9bf6860b | 246 | AliDebug(1,Form("chambers%d-%d: NSegments = %d ", ch1+1, ch2+1, segments->GetEntriesFast())); |
96ebe67e | 247 | |
208f139e | 248 | return segments; |
8d0843c6 | 249 | } |
250 | ||
ea94c18b | 251 | //__________________________________________________________________________ |
252 | void AliMUONVTrackReconstructor::RemoveIdenticalTracks() | |
253 | { | |
254 | /// To remove identical tracks: | |
96ebe67e | 255 | /// Tracks are considered identical if they have all their clusters in common. |
256 | /// One keeps the track with the larger number of clusters if need be | |
ea94c18b | 257 | AliMUONTrack *track1, *track2, *trackToRemove; |
96ebe67e | 258 | Int_t clustersInCommon, nClusters1, nClusters2; |
ea94c18b | 259 | Bool_t removedTrack1; |
260 | // Loop over first track of the pair | |
261 | track1 = (AliMUONTrack*) fRecTracksPtr->First(); | |
262 | while (track1) { | |
263 | removedTrack1 = kFALSE; | |
96ebe67e | 264 | nClusters1 = track1->GetNClusters(); |
ea94c18b | 265 | // Loop over second track of the pair |
266 | track2 = (AliMUONTrack*) fRecTracksPtr->After(track1); | |
267 | while (track2) { | |
96ebe67e | 268 | nClusters2 = track2->GetNClusters(); |
269 | // number of clusters in common between two tracks | |
270 | clustersInCommon = track1->ClustersInCommon(track2); | |
ea94c18b | 271 | // check for identical tracks |
96ebe67e | 272 | if ((clustersInCommon == nClusters1) || (clustersInCommon == nClusters2)) { |
ea94c18b | 273 | // decide which track to remove |
96ebe67e | 274 | if (nClusters2 > nClusters1) { |
ea94c18b | 275 | // remove track1 and continue the first loop with the track next to track1 |
276 | trackToRemove = track1; | |
277 | track1 = (AliMUONTrack*) fRecTracksPtr->After(track1); | |
278 | fRecTracksPtr->Remove(trackToRemove); | |
279 | fRecTracksPtr->Compress(); // this is essential to retrieve the TClonesArray afterwards | |
280 | fNRecTracks--; | |
281 | removedTrack1 = kTRUE; | |
282 | break; | |
283 | } else { | |
284 | // remove track2 and continue the second loop with the track next to track2 | |
285 | trackToRemove = track2; | |
286 | track2 = (AliMUONTrack*) fRecTracksPtr->After(track2); | |
287 | fRecTracksPtr->Remove(trackToRemove); | |
288 | fRecTracksPtr->Compress(); // this is essential to retrieve the TClonesArray afterwards | |
289 | fNRecTracks--; | |
290 | } | |
291 | } else track2 = (AliMUONTrack*) fRecTracksPtr->After(track2); | |
292 | } // track2 | |
293 | if (removedTrack1) continue; | |
294 | track1 = (AliMUONTrack*) fRecTracksPtr->After(track1); | |
295 | } // track1 | |
296 | return; | |
297 | } | |
298 | ||
299 | //__________________________________________________________________________ | |
300 | void AliMUONVTrackReconstructor::RemoveDoubleTracks() | |
301 | { | |
302 | /// To remove double tracks: | |
96ebe67e | 303 | /// Tracks are considered identical if more than half of the clusters of the track |
304 | /// which has the smaller number of clusters are in common with the other track. | |
305 | /// Among two identical tracks, one keeps the track with the larger number of clusters | |
ea94c18b | 306 | /// or, if these numbers are equal, the track with the minimum chi2. |
307 | AliMUONTrack *track1, *track2, *trackToRemove; | |
96ebe67e | 308 | Int_t clustersInCommon, nClusters1, nClusters2; |
ea94c18b | 309 | Bool_t removedTrack1; |
310 | // Loop over first track of the pair | |
311 | track1 = (AliMUONTrack*) fRecTracksPtr->First(); | |
312 | while (track1) { | |
313 | removedTrack1 = kFALSE; | |
96ebe67e | 314 | nClusters1 = track1->GetNClusters(); |
ea94c18b | 315 | // Loop over second track of the pair |
316 | track2 = (AliMUONTrack*) fRecTracksPtr->After(track1); | |
317 | while (track2) { | |
96ebe67e | 318 | nClusters2 = track2->GetNClusters(); |
319 | // number of clusters in common between two tracks | |
320 | clustersInCommon = track1->ClustersInCommon(track2); | |
ea94c18b | 321 | // check for identical tracks |
96ebe67e | 322 | if (((nClusters1 < nClusters2) && (2 * clustersInCommon > nClusters1)) || (2 * clustersInCommon > nClusters2)) { |
ea94c18b | 323 | // decide which track to remove |
96ebe67e | 324 | if ((nClusters1 > nClusters2) || ((nClusters1 == nClusters2) && (track1->GetGlobalChi2() <= track2->GetGlobalChi2()))) { |
ea94c18b | 325 | // remove track2 and continue the second loop with the track next to track2 |
326 | trackToRemove = track2; | |
327 | track2 = (AliMUONTrack*) fRecTracksPtr->After(track2); | |
328 | fRecTracksPtr->Remove(trackToRemove); | |
329 | fRecTracksPtr->Compress(); // this is essential to retrieve the TClonesArray afterwards | |
330 | fNRecTracks--; | |
331 | } else { | |
332 | // else remove track1 and continue the first loop with the track next to track1 | |
333 | trackToRemove = track1; | |
334 | track1 = (AliMUONTrack*) fRecTracksPtr->After(track1); | |
335 | fRecTracksPtr->Remove(trackToRemove); | |
336 | fRecTracksPtr->Compress(); // this is essential to retrieve the TClonesArray afterwards | |
337 | fNRecTracks--; | |
338 | removedTrack1 = kTRUE; | |
339 | break; | |
340 | } | |
341 | } else track2 = (AliMUONTrack*) fRecTracksPtr->After(track2); | |
342 | } // track2 | |
343 | if (removedTrack1) continue; | |
344 | track1 = (AliMUONTrack*) fRecTracksPtr->After(track1); | |
345 | } // track1 | |
346 | return; | |
347 | } | |
348 | ||
1fef78c8 | 349 | //__________________________________________________________________________ |
9bf6860b | 350 | void AliMUONVTrackReconstructor::AskForNewClustersInChamber(const AliMUONTrackParam &trackParam, |
351 | AliMUONVClusterStore& clusterStore, Int_t chamber) | |
1fef78c8 | 352 | { |
353 | /// Ask the clustering to reconstruct new clusters around the track candidate position | |
1fef78c8 | 354 | |
9bf6860b | 355 | // check if the current chamber is useable |
356 | if (!AliMUONReconstructor::GetRecoParam()->UseChamber(chamber)) return; | |
1fef78c8 | 357 | |
9bf6860b | 358 | // maximum distance between the center of the chamber and a detection element |
359 | // (accounting for the inclination of the chamber) | |
360 | static const Double_t gkMaxDZ = 15.; // 15 cm | |
1fef78c8 | 361 | |
9bf6860b | 362 | // extrapolate track parameters to the chamber |
363 | AliMUONTrackParam extrapTrackParam(trackParam); | |
364 | AliMUONTrackExtrap::ExtrapToZCov(&extrapTrackParam, AliMUONConstants::DefaultChamberZ(chamber)); | |
365 | ||
366 | // build the searching area using the track resolution and the maximum-distance-to-track value | |
367 | const TMatrixD& kParamCov = extrapTrackParam.GetCovariances(); | |
368 | Double_t errX2 = kParamCov(0,0) + gkMaxDZ * gkMaxDZ * kParamCov(1,1) + 2. * gkMaxDZ * TMath::Abs(kParamCov(0,1)); | |
369 | Double_t errY2 = kParamCov(2,2) + gkMaxDZ * gkMaxDZ * kParamCov(3,3) + 2. * gkMaxDZ * TMath::Abs(kParamCov(2,3)); | |
370 | Double_t dX = TMath::Abs(trackParam.GetNonBendingSlope()) * gkMaxDZ + | |
371 | AliMUONReconstructor::GetRecoParam()->GetMaxNonBendingDistanceToTrack() + | |
372 | AliMUONReconstructor::GetRecoParam()->GetSigmaCutForTracking() * TMath::Sqrt(errX2); | |
373 | Double_t dY = TMath::Abs(trackParam.GetBendingSlope()) * gkMaxDZ + | |
374 | AliMUONReconstructor::GetRecoParam()->GetMaxBendingDistanceToTrack() + | |
375 | AliMUONReconstructor::GetRecoParam()->GetSigmaCutForTracking() * TMath::Sqrt(errY2); | |
376 | TVector2 dimensions(dX, dY); | |
1fef78c8 | 377 | TVector2 position(extrapTrackParam.GetNonBendingCoor(), extrapTrackParam.GetBendingCoor()); |
9bf6860b | 378 | AliMpArea area(position, dimensions); |
1fef78c8 | 379 | |
380 | // ask to cluterize in the given area of the given chamber | |
9bf6860b | 381 | fClusterServer.Clusterize(chamber, clusterStore, area); |
1fef78c8 | 382 | |
9bf6860b | 383 | } |
384 | ||
385 | //__________________________________________________________________________ | |
386 | void AliMUONVTrackReconstructor::AskForNewClustersInStation(const AliMUONTrackParam &trackParam, | |
387 | AliMUONVClusterStore& clusterStore, Int_t station) | |
388 | { | |
389 | /// Ask the clustering to reconstruct new clusters around the track candidate position | |
390 | /// in the 2 chambers of the given station | |
391 | AskForNewClustersInChamber(trackParam, clusterStore, 2*station+1); | |
392 | AskForNewClustersInChamber(trackParam, clusterStore, 2*station); | |
1fef78c8 | 393 | } |
394 | ||
ea94c18b | 395 | //__________________________________________________________________________ |
96ebe67e | 396 | Double_t AliMUONVTrackReconstructor::TryOneCluster(const AliMUONTrackParam &trackParam, AliMUONVCluster* cluster, |
1fef78c8 | 397 | AliMUONTrackParam &trackParamAtCluster, Bool_t updatePropagator) |
ea94c18b | 398 | { |
96ebe67e | 399 | /// Test the compatibility between the track and the cluster (using trackParam's covariance matrix): |
ea94c18b | 400 | /// return the corresponding Chi2 |
96ebe67e | 401 | /// return trackParamAtCluster |
ea94c18b | 402 | |
96ebe67e | 403 | // extrapolate track parameters and covariances at the z position of the tested cluster |
404 | trackParamAtCluster = trackParam; | |
405 | AliMUONTrackExtrap::ExtrapToZCov(&trackParamAtCluster, cluster->GetZ(), updatePropagator); | |
ea94c18b | 406 | |
96ebe67e | 407 | // set pointer to cluster into trackParamAtCluster |
408 | trackParamAtCluster.SetClusterPtr(cluster); | |
ea94c18b | 409 | |
96ebe67e | 410 | // Set differences between trackParam and cluster in the bending and non bending directions |
411 | Double_t dX = cluster->GetX() - trackParamAtCluster.GetNonBendingCoor(); | |
412 | Double_t dY = cluster->GetY() - trackParamAtCluster.GetBendingCoor(); | |
ea94c18b | 413 | |
019df241 | 414 | // Calculate errors and covariances |
96ebe67e | 415 | const TMatrixD& kParamCov = trackParamAtCluster.GetCovariances(); |
416 | Double_t sigmaX2 = kParamCov(0,0) + cluster->GetErrX2(); | |
417 | Double_t sigmaY2 = kParamCov(2,2) + cluster->GetErrY2(); | |
019df241 | 418 | |
419 | // Compute chi2 | |
96ebe67e | 420 | return dX * dX / sigmaX2 + dY * dY / sigmaY2; |
019df241 | 421 | |
422 | } | |
423 | ||
424 | //__________________________________________________________________________ | |
96ebe67e | 425 | Bool_t AliMUONVTrackReconstructor::TryOneClusterFast(const AliMUONTrackParam &trackParam, AliMUONVCluster* cluster) |
019df241 | 426 | { |
9bf6860b | 427 | /// Test the compatibility between the track and the cluster |
428 | /// given the track resolution + the maximum-distance-to-track value | |
429 | /// and assuming linear propagation of the track: | |
019df241 | 430 | /// return kTRUE if they are compatibles |
431 | ||
96ebe67e | 432 | Double_t dZ = cluster->GetZ() - trackParam.GetZ(); |
433 | Double_t dX = cluster->GetX() - (trackParam.GetNonBendingCoor() + trackParam.GetNonBendingSlope() * dZ); | |
434 | Double_t dY = cluster->GetY() - (trackParam.GetBendingCoor() + trackParam.GetBendingSlope() * dZ); | |
9bf6860b | 435 | const TMatrixD& kParamCov = trackParam.GetCovariances(); |
436 | Double_t errX2 = kParamCov(0,0) + dZ * dZ * kParamCov(1,1) + 2. * dZ * kParamCov(0,1); | |
437 | Double_t errY2 = kParamCov(2,2) + dZ * dZ * kParamCov(3,3) + 2. * dZ * kParamCov(2,3); | |
438 | ||
439 | Double_t dXmax = AliMUONReconstructor::GetRecoParam()->GetSigmaCutForTracking() * TMath::Sqrt(errX2) + | |
440 | AliMUONReconstructor::GetRecoParam()->GetMaxNonBendingDistanceToTrack(); | |
441 | Double_t dYmax = AliMUONReconstructor::GetRecoParam()->GetSigmaCutForTracking() * TMath::Sqrt(errY2) + | |
442 | AliMUONReconstructor::GetRecoParam()->GetMaxBendingDistanceToTrack(); | |
019df241 | 443 | |
9bf6860b | 444 | if (TMath::Abs(dX) > dXmax || TMath::Abs(dY) > dYmax) return kFALSE; |
019df241 | 445 | |
446 | return kTRUE; | |
447 | ||
448 | } | |
449 | ||
450 | //__________________________________________________________________________ | |
96ebe67e | 451 | Double_t AliMUONVTrackReconstructor::TryTwoClustersFast(const AliMUONTrackParam &trackParamAtCluster1, AliMUONVCluster* cluster2, |
452 | AliMUONTrackParam &trackParamAtCluster2) | |
019df241 | 453 | { |
96ebe67e | 454 | /// Test the compatibility between the track and the 2 clusters together (using trackParam's covariance matrix) |
455 | /// assuming linear propagation between the two clusters: | |
456 | /// return the corresponding Chi2 accounting for covariances between the 2 clusters | |
457 | /// return trackParamAtCluster2 | |
019df241 | 458 | |
96ebe67e | 459 | // extrapolate linearly track parameters and covariances at the z position of the second cluster |
460 | trackParamAtCluster2 = trackParamAtCluster1; | |
461 | AliMUONTrackExtrap::LinearExtrapToZ(&trackParamAtCluster2, cluster2->GetZ()); | |
019df241 | 462 | |
96ebe67e | 463 | // set pointer to cluster2 into trackParamAtCluster2 |
464 | trackParamAtCluster2.SetClusterPtr(cluster2); | |
019df241 | 465 | |
96ebe67e | 466 | // Set differences between track and clusters in the bending and non bending directions |
467 | AliMUONVCluster* cluster1 = trackParamAtCluster1.GetClusterPtr(); | |
468 | Double_t dX1 = cluster1->GetX() - trackParamAtCluster1.GetNonBendingCoor(); | |
469 | Double_t dX2 = cluster2->GetX() - trackParamAtCluster2.GetNonBendingCoor(); | |
470 | Double_t dY1 = cluster1->GetY() - trackParamAtCluster1.GetBendingCoor(); | |
471 | Double_t dY2 = cluster2->GetY() - trackParamAtCluster2.GetBendingCoor(); | |
019df241 | 472 | |
473 | // Calculate errors and covariances | |
96ebe67e | 474 | const TMatrixD& kParamCov1 = trackParamAtCluster1.GetCovariances(); |
475 | const TMatrixD& kParamCov2 = trackParamAtCluster2.GetCovariances(); | |
476 | Double_t dZ = trackParamAtCluster2.GetZ() - trackParamAtCluster1.GetZ(); | |
477 | Double_t sigma2X1 = kParamCov1(0,0) + cluster1->GetErrX2(); | |
478 | Double_t sigma2X2 = kParamCov2(0,0) + cluster2->GetErrX2(); | |
019df241 | 479 | Double_t covX1X2 = kParamCov1(0,0) + dZ * kParamCov1(0,1); |
96ebe67e | 480 | Double_t sigma2Y1 = kParamCov1(2,2) + cluster1->GetErrY2(); |
481 | Double_t sigma2Y2 = kParamCov2(2,2) + cluster2->GetErrY2(); | |
019df241 | 482 | Double_t covY1Y2 = kParamCov1(2,2) + dZ * kParamCov1(2,3); |
483 | ||
484 | // Compute chi2 | |
485 | Double_t detX = sigma2X1 * sigma2X2 - covX1X2 * covX1X2; | |
486 | Double_t detY = sigma2Y1 * sigma2Y2 - covY1Y2 * covY1Y2; | |
487 | if (detX == 0. || detY == 0.) return 1.e10; | |
488 | return (dX1 * dX1 * sigma2X2 + dX2 * dX2 * sigma2X1 - 2. * dX1 * dX2 * covX1X2) / detX | |
489 | + (dY1 * dY1 * sigma2Y2 + dY2 * dY2 * sigma2Y1 - 2. * dY1 * dY2 * covY1Y2) / detY; | |
490 | ||
491 | } | |
492 | ||
493 | //__________________________________________________________________________ | |
9bf6860b | 494 | Bool_t AliMUONVTrackReconstructor::FollowLinearTrackInChamber(AliMUONTrack &trackCandidate, const AliMUONVClusterStore& clusterStore, |
495 | Int_t nextChamber) | |
496 | { | |
497 | /// Follow trackCandidate in chamber(0..) nextChamber assuming linear propagation, and search for compatible cluster(s) | |
498 | /// Keep all possibilities or only the best one(s) according to the flag fgkTrackAllTracks: | |
499 | /// kTRUE: duplicate "trackCandidate" if there are several possibilities and add the new tracks at the end of | |
500 | /// fRecTracksPtr to avoid conficts with other track candidates at this current stage of the tracking procedure. | |
501 | /// Remove the obsolete "trackCandidate" at the end. | |
502 | /// kFALSE: add only the best cluster(s) to the "trackCandidate". Try to add a couple of clusters in priority. | |
503 | /// return kTRUE if new cluster(s) have been found (otherwise return kFALSE) | |
504 | AliDebug(1,Form("Enter FollowLinearTrackInChamber(1..) %d", nextChamber+1)); | |
505 | ||
506 | Double_t chi2WithOneCluster = 1.e10; | |
507 | Double_t maxChi2WithOneCluster = 2. * AliMUONReconstructor::GetRecoParam()->GetSigmaCutForTracking() * | |
508 | AliMUONReconstructor::GetRecoParam()->GetSigmaCutForTracking(); // 2 because 2 quantities in chi2 | |
509 | Double_t bestChi2WithOneCluster = maxChi2WithOneCluster; | |
510 | Bool_t foundOneCluster = kFALSE; | |
511 | AliMUONTrack *newTrack = 0x0; | |
512 | AliMUONVCluster *cluster; | |
513 | AliMUONTrackParam trackParam; | |
514 | AliMUONTrackParam extrapTrackParamAtCluster; | |
515 | AliMUONTrackParam bestTrackParamAtCluster; | |
516 | ||
517 | // Get track parameters according to the propagation direction | |
518 | if (nextChamber > 7) trackParam = *(AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->Last(); | |
519 | else trackParam = *(AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->First(); | |
520 | ||
521 | // Printout for debuging | |
522 | if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 2) || (AliLog::GetGlobalDebugLevel() >= 2)) { | |
523 | cout<<endl<<"Track parameters and covariances at first cluster:"<<endl; | |
524 | trackParam.GetParameters().Print(); | |
525 | trackParam.GetCovariances().Print(); | |
526 | } | |
527 | ||
528 | // Add MCS effect | |
529 | AliMUONTrackExtrap::AddMCSEffect(&trackParam,AliMUONConstants::ChamberThicknessInX0(),1.); | |
530 | ||
531 | // Printout for debuging | |
532 | if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
533 | cout << "FollowLinearTrackInChamber: look for cluster in chamber(1..): " << nextChamber+1 << endl; | |
534 | } | |
535 | ||
536 | // Create iterators to loop over clusters in chamber | |
537 | TIter next(clusterStore.CreateChamberIterator(nextChamber,nextChamber)); | |
538 | ||
539 | // look for candidates in chamber | |
540 | while ( ( cluster = static_cast<AliMUONVCluster*>(next()) ) ) { | |
541 | ||
542 | // try to add the current cluster fast | |
543 | if (!TryOneClusterFast(trackParam, cluster)) continue; | |
544 | ||
545 | // try to add the current cluster accuratly | |
546 | extrapTrackParamAtCluster = trackParam; | |
547 | AliMUONTrackExtrap::LinearExtrapToZ(&extrapTrackParamAtCluster, cluster->GetZ()); | |
548 | chi2WithOneCluster = TryOneCluster(extrapTrackParamAtCluster, cluster, extrapTrackParamAtCluster); | |
549 | ||
550 | // if good chi2 then consider to add cluster | |
551 | if (chi2WithOneCluster < maxChi2WithOneCluster) { | |
552 | foundOneCluster = kTRUE; | |
553 | ||
554 | // Printout for debuging | |
555 | if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
556 | cout << "FollowLinearTrackInChamber: found one cluster in chamber(1..): " << nextChamber+1 | |
557 | << " (Chi2 = " << chi2WithOneCluster << ")" << endl; | |
558 | cluster->Print(); | |
559 | } | |
560 | ||
561 | if (AliMUONReconstructor::GetRecoParam()->TrackAllTracks()) { | |
562 | // copy trackCandidate into a new track put at the end of fRecTracksPtr and add the new cluster | |
563 | newTrack = new ((*fRecTracksPtr)[fRecTracksPtr->GetLast()+1]) AliMUONTrack(trackCandidate); | |
564 | if (AliMUONReconstructor::GetRecoParam()->RequestStation(nextChamber/2)) | |
565 | extrapTrackParamAtCluster.SetRemovable(kFALSE); | |
566 | else extrapTrackParamAtCluster.SetRemovable(kTRUE); | |
567 | newTrack->AddTrackParamAtCluster(extrapTrackParamAtCluster,*cluster); | |
568 | fNRecTracks++; | |
569 | ||
570 | // Printout for debuging | |
571 | if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
572 | cout << "FollowLinearTrackInChamber: added one cluster in chamber(1..): " << nextChamber+1 << endl; | |
573 | if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump(); | |
574 | } | |
575 | ||
576 | } else if (chi2WithOneCluster < bestChi2WithOneCluster) { | |
577 | // keep track of the best cluster | |
578 | bestChi2WithOneCluster = chi2WithOneCluster; | |
579 | bestTrackParamAtCluster = extrapTrackParamAtCluster; | |
580 | } | |
581 | ||
582 | } | |
583 | ||
584 | } | |
585 | ||
586 | // fill out the best track if required else clean up the fRecTracksPtr array | |
587 | if (!AliMUONReconstructor::GetRecoParam()->TrackAllTracks()) { | |
588 | if (foundOneCluster) { | |
589 | if (AliMUONReconstructor::GetRecoParam()->RequestStation(nextChamber/2)) | |
590 | bestTrackParamAtCluster.SetRemovable(kFALSE); | |
591 | else bestTrackParamAtCluster.SetRemovable(kTRUE); | |
592 | trackCandidate.AddTrackParamAtCluster(bestTrackParamAtCluster,*(bestTrackParamAtCluster.GetClusterPtr())); | |
593 | ||
594 | // Printout for debuging | |
595 | if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
596 | cout << "FollowLinearTrackInChamber: added the best cluster in chamber(1..): " << bestTrackParamAtCluster.GetClusterPtr()->GetChamberId()+1 << endl; | |
597 | if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump(); | |
598 | } | |
599 | ||
600 | } else return kFALSE; | |
601 | ||
602 | } else if (foundOneCluster) { | |
603 | ||
604 | // remove obsolete track | |
605 | fRecTracksPtr->Remove(&trackCandidate); | |
606 | fNRecTracks--; | |
607 | ||
608 | } else return kFALSE; | |
609 | ||
610 | return kTRUE; | |
611 | ||
612 | } | |
613 | ||
614 | //__________________________________________________________________________ | |
96ebe67e | 615 | Bool_t AliMUONVTrackReconstructor::FollowLinearTrackInStation(AliMUONTrack &trackCandidate, const AliMUONVClusterStore& clusterStore, |
616 | Int_t nextStation) | |
019df241 | 617 | { |
96ebe67e | 618 | /// Follow trackCandidate in station(0..) nextStation assuming linear propagation, and search for compatible cluster(s) |
019df241 | 619 | /// Keep all possibilities or only the best one(s) according to the flag fgkTrackAllTracks: |
620 | /// kTRUE: duplicate "trackCandidate" if there are several possibilities and add the new tracks at the end of | |
621 | /// fRecTracksPtr to avoid conficts with other track candidates at this current stage of the tracking procedure. | |
622 | /// Remove the obsolete "trackCandidate" at the end. | |
96ebe67e | 623 | /// kFALSE: add only the best cluster(s) to the "trackCandidate". Try to add a couple of clusters in priority. |
624 | /// return kTRUE if new cluster(s) have been found (otherwise return kFALSE) | |
019df241 | 625 | AliDebug(1,Form("Enter FollowLinearTrackInStation(1..) %d", nextStation+1)); |
626 | ||
627 | // Order the chamber according to the propagation direction (tracking starts with chamber 2): | |
628 | // - nextStation == station(1...) 5 => forward propagation | |
629 | // - nextStation < station(1...) 5 => backward propagation | |
630 | Int_t ch1, ch2; | |
631 | if (nextStation==4) { | |
632 | ch1 = 2*nextStation+1; | |
633 | ch2 = 2*nextStation; | |
ea94c18b | 634 | } else { |
019df241 | 635 | ch1 = 2*nextStation; |
636 | ch2 = 2*nextStation+1; | |
ea94c18b | 637 | } |
638 | ||
96ebe67e | 639 | Double_t chi2WithOneCluster = 1.e10; |
640 | Double_t chi2WithTwoClusters = 1.e10; | |
641 | Double_t maxChi2WithOneCluster = 2. * AliMUONReconstructor::GetRecoParam()->GetSigmaCutForTracking() * | |
642 | AliMUONReconstructor::GetRecoParam()->GetSigmaCutForTracking(); // 2 because 2 quantities in chi2 | |
643 | Double_t maxChi2WithTwoClusters = 4. * AliMUONReconstructor::GetRecoParam()->GetSigmaCutForTracking() * | |
644 | AliMUONReconstructor::GetRecoParam()->GetSigmaCutForTracking(); // 4 because 4 quantities in chi2 | |
645 | Double_t bestChi2WithOneCluster = maxChi2WithOneCluster; | |
646 | Double_t bestChi2WithTwoClusters = maxChi2WithTwoClusters; | |
647 | Bool_t foundOneCluster = kFALSE; | |
648 | Bool_t foundTwoClusters = kFALSE; | |
019df241 | 649 | AliMUONTrack *newTrack = 0x0; |
96ebe67e | 650 | AliMUONVCluster *clusterCh1, *clusterCh2; |
7332f213 | 651 | AliMUONTrackParam trackParam; |
96ebe67e | 652 | AliMUONTrackParam extrapTrackParamAtCluster1; |
653 | AliMUONTrackParam extrapTrackParamAtCluster2; | |
654 | AliMUONTrackParam bestTrackParamAtCluster1; | |
655 | AliMUONTrackParam bestTrackParamAtCluster2; | |
656 | ||
657 | Int_t nClusters = clusterStore.GetSize(); | |
658 | Bool_t *clusterCh1Used = new Bool_t[nClusters]; | |
659 | for (Int_t i = 0; i < nClusters; i++) clusterCh1Used[i] = kFALSE; | |
660 | Int_t iCluster1; | |
019df241 | 661 | |
7332f213 | 662 | // Get track parameters according to the propagation direction |
663 | if (nextStation==4) trackParam = *(AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->Last(); | |
664 | else trackParam = *(AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->First(); | |
019df241 | 665 | |
9bf6860b | 666 | // Printout for debuging |
667 | if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 2) || (AliLog::GetGlobalDebugLevel() >= 2)) { | |
668 | cout<<endl<<"Track parameters and covariances at first cluster:"<<endl; | |
669 | trackParam.GetParameters().Print(); | |
670 | trackParam.GetCovariances().Print(); | |
671 | } | |
672 | ||
019df241 | 673 | // Add MCS effect |
674 | AliMUONTrackExtrap::AddMCSEffect(&trackParam,AliMUONConstants::ChamberThicknessInX0(),1.); | |
675 | ||
676 | // Printout for debuging | |
677 | if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
96ebe67e | 678 | cout << "FollowLinearTrackInStation: look for clusters in chamber(1..): " << ch2+1 << endl; |
019df241 | 679 | } |
680 | ||
96ebe67e | 681 | // Create iterators to loop over clusters in both chambers |
682 | TIter nextInCh1(clusterStore.CreateChamberIterator(ch1,ch1)); | |
683 | TIter nextInCh2(clusterStore.CreateChamberIterator(ch2,ch2)); | |
684 | ||
685 | // look for candidates in chamber 2 | |
686 | while ( ( clusterCh2 = static_cast<AliMUONVCluster*>(nextInCh2()) ) ) { | |
019df241 | 687 | |
96ebe67e | 688 | // try to add the current cluster fast |
689 | if (!TryOneClusterFast(trackParam, clusterCh2)) continue; | |
019df241 | 690 | |
96ebe67e | 691 | // try to add the current cluster accuratly |
692 | extrapTrackParamAtCluster2 = trackParam; | |
693 | AliMUONTrackExtrap::LinearExtrapToZ(&extrapTrackParamAtCluster2, clusterCh2->GetZ()); | |
694 | chi2WithOneCluster = TryOneCluster(extrapTrackParamAtCluster2, clusterCh2, extrapTrackParamAtCluster2); | |
019df241 | 695 | |
96ebe67e | 696 | // if good chi2 then try to attach a cluster in the other chamber too |
697 | if (chi2WithOneCluster < maxChi2WithOneCluster) { | |
698 | Bool_t foundSecondCluster = kFALSE; | |
019df241 | 699 | |
700 | // Printout for debuging | |
701 | if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
96ebe67e | 702 | cout << "FollowLinearTrackInStation: found one cluster in chamber(1..): " << ch2+1 |
703 | << " (Chi2 = " << chi2WithOneCluster << ")" << endl; | |
9bf6860b | 704 | clusterCh2->Print(); |
96ebe67e | 705 | cout << " look for second clusters in chamber(1..): " << ch1+1 << " ..." << endl; |
019df241 | 706 | } |
707 | ||
708 | // add MCS effect | |
96ebe67e | 709 | AliMUONTrackExtrap::AddMCSEffect(&extrapTrackParamAtCluster2,AliMUONConstants::ChamberThicknessInX0(),1.); |
019df241 | 710 | |
96ebe67e | 711 | // reset cluster iterator of chamber 1 |
712 | nextInCh1.Reset(); | |
713 | iCluster1 = -1; | |
714 | ||
715 | // look for second candidates in chamber 1 | |
716 | while ( ( clusterCh1 = static_cast<AliMUONVCluster*>(nextInCh1()) ) ) { | |
717 | iCluster1++; | |
019df241 | 718 | |
96ebe67e | 719 | // try to add the current cluster fast |
720 | if (!TryOneClusterFast(extrapTrackParamAtCluster2, clusterCh1)) continue; | |
019df241 | 721 | |
96ebe67e | 722 | // try to add the current cluster in addition to the one found in the previous chamber |
723 | chi2WithTwoClusters = TryTwoClustersFast(extrapTrackParamAtCluster2, clusterCh1, extrapTrackParamAtCluster1); | |
019df241 | 724 | |
96ebe67e | 725 | // if good chi2 then consider to add the 2 clusters to the "trackCandidate" |
726 | if (chi2WithTwoClusters < maxChi2WithTwoClusters) { | |
727 | foundSecondCluster = kTRUE; | |
728 | foundTwoClusters = kTRUE; | |
019df241 | 729 | |
730 | // Printout for debuging | |
731 | if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
96ebe67e | 732 | cout << "FollowLinearTrackInStation: found one cluster in chamber(1..): " << ch1+1 |
9bf6860b | 733 | << " (Chi2 = " << chi2WithTwoClusters << ")" << endl; |
734 | clusterCh1->Print(); | |
019df241 | 735 | } |
736 | ||
3304fa09 | 737 | if (AliMUONReconstructor::GetRecoParam()->TrackAllTracks()) { |
96ebe67e | 738 | // copy trackCandidate into a new track put at the end of fRecTracksPtr and add the new clusters |
019df241 | 739 | newTrack = new ((*fRecTracksPtr)[fRecTracksPtr->GetLast()+1]) AliMUONTrack(trackCandidate); |
96ebe67e | 740 | extrapTrackParamAtCluster1.SetRemovable(kTRUE); |
741 | newTrack->AddTrackParamAtCluster(extrapTrackParamAtCluster1,*clusterCh1); | |
742 | extrapTrackParamAtCluster2.SetRemovable(kTRUE); | |
743 | newTrack->AddTrackParamAtCluster(extrapTrackParamAtCluster2,*clusterCh2); | |
019df241 | 744 | fNRecTracks++; |
745 | ||
96ebe67e | 746 | // Tag clusterCh1 as used |
747 | clusterCh1Used[iCluster1] = kTRUE; | |
019df241 | 748 | |
749 | // Printout for debuging | |
750 | if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
96ebe67e | 751 | cout << "FollowLinearTrackInStation: added two clusters in station(1..): " << nextStation+1 << endl; |
019df241 | 752 | if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump(); |
753 | } | |
754 | ||
96ebe67e | 755 | } else if (chi2WithTwoClusters < bestChi2WithTwoClusters) { |
756 | // keep track of the best couple of clusters | |
757 | bestChi2WithTwoClusters = chi2WithTwoClusters; | |
758 | bestTrackParamAtCluster1 = extrapTrackParamAtCluster1; | |
759 | bestTrackParamAtCluster2 = extrapTrackParamAtCluster2; | |
019df241 | 760 | } |
761 | ||
762 | } | |
763 | ||
764 | } | |
765 | ||
96ebe67e | 766 | // if no cluster found in chamber1 then consider to add clusterCh2 only |
767 | if (!foundSecondCluster) { | |
768 | foundOneCluster = kTRUE; | |
019df241 | 769 | |
3304fa09 | 770 | if (AliMUONReconstructor::GetRecoParam()->TrackAllTracks()) { |
96ebe67e | 771 | // copy trackCandidate into a new track put at the end of fRecTracksPtr and add the new cluster |
019df241 | 772 | newTrack = new ((*fRecTracksPtr)[fRecTracksPtr->GetLast()+1]) AliMUONTrack(trackCandidate); |
9bf6860b | 773 | if (AliMUONReconstructor::GetRecoParam()->RequestStation(nextStation)) |
774 | extrapTrackParamAtCluster2.SetRemovable(kFALSE); | |
775 | else extrapTrackParamAtCluster2.SetRemovable(kTRUE); | |
96ebe67e | 776 | newTrack->AddTrackParamAtCluster(extrapTrackParamAtCluster2,*clusterCh2); |
019df241 | 777 | fNRecTracks++; |
778 | ||
779 | // Printout for debuging | |
780 | if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
96ebe67e | 781 | cout << "FollowLinearTrackInStation: added one cluster in chamber(1..): " << ch2+1 << endl; |
019df241 | 782 | if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump(); |
783 | } | |
784 | ||
96ebe67e | 785 | } else if (!foundTwoClusters && chi2WithOneCluster < bestChi2WithOneCluster) { |
786 | // keep track of the best cluster except if a couple of clusters has already been found | |
787 | bestChi2WithOneCluster = chi2WithOneCluster; | |
788 | bestTrackParamAtCluster1 = extrapTrackParamAtCluster2; | |
019df241 | 789 | } |
790 | ||
791 | } | |
792 | ||
793 | } | |
794 | ||
795 | } | |
796 | ||
797 | // look for candidates in chamber 1 not already attached to a track | |
96ebe67e | 798 | // if we want to keep all possible tracks or if no good couple of clusters has been found |
799 | if (AliMUONReconstructor::GetRecoParam()->TrackAllTracks() || !foundTwoClusters) { | |
019df241 | 800 | |
801 | // Printout for debuging | |
802 | if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
96ebe67e | 803 | cout << "FollowLinearTrackInStation: look for single cluster in chamber(1..): " << ch1+1 << endl; |
019df241 | 804 | } |
805 | ||
806 | //Extrapolate trackCandidate to chamber "ch2" | |
807 | AliMUONTrackExtrap::LinearExtrapToZ(&trackParam, AliMUONConstants::DefaultChamberZ(ch2)); | |
808 | ||
809 | // add MCS effect for next step | |
810 | AliMUONTrackExtrap::AddMCSEffect(&trackParam,AliMUONConstants::ChamberThicknessInX0(),1.); | |
9bf6860b | 811 | |
96ebe67e | 812 | // reset cluster iterator of chamber 1 |
813 | nextInCh1.Reset(); | |
814 | iCluster1 = -1; | |
815 | ||
816 | // look for second candidates in chamber 1 | |
817 | while ( ( clusterCh1 = static_cast<AliMUONVCluster*>(nextInCh1()) ) ) { | |
818 | iCluster1++; | |
019df241 | 819 | |
96ebe67e | 820 | if (clusterCh1Used[iCluster1]) continue; // Skip clusters already used |
019df241 | 821 | |
96ebe67e | 822 | // try to add the current cluster fast |
823 | if (!TryOneClusterFast(trackParam, clusterCh1)) continue; | |
9bf6860b | 824 | |
96ebe67e | 825 | // try to add the current cluster accuratly |
826 | extrapTrackParamAtCluster1 = trackParam; | |
827 | AliMUONTrackExtrap::LinearExtrapToZ(&extrapTrackParamAtCluster1, clusterCh1->GetZ()); | |
828 | chi2WithOneCluster = TryOneCluster(extrapTrackParamAtCluster1, clusterCh1, extrapTrackParamAtCluster1); | |
9bf6860b | 829 | |
96ebe67e | 830 | // if good chi2 then consider to add clusterCh1 |
831 | // We do not try to attach a cluster in the other chamber too since it has already been done above | |
832 | if (chi2WithOneCluster < maxChi2WithOneCluster) { | |
833 | foundOneCluster = kTRUE; | |
019df241 | 834 | |
835 | // Printout for debuging | |
836 | if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
96ebe67e | 837 | cout << "FollowLinearTrackInStation: found one cluster in chamber(1..): " << ch1+1 |
838 | << " (Chi2 = " << chi2WithOneCluster << ")" << endl; | |
9bf6860b | 839 | clusterCh1->Print(); |
019df241 | 840 | } |
841 | ||
3304fa09 | 842 | if (AliMUONReconstructor::GetRecoParam()->TrackAllTracks()) { |
96ebe67e | 843 | // copy trackCandidate into a new track put at the end of fRecTracksPtr and add the new cluster |
019df241 | 844 | newTrack = new ((*fRecTracksPtr)[fRecTracksPtr->GetLast()+1]) AliMUONTrack(trackCandidate); |
9bf6860b | 845 | if (AliMUONReconstructor::GetRecoParam()->RequestStation(nextStation)) |
846 | extrapTrackParamAtCluster1.SetRemovable(kFALSE); | |
847 | else extrapTrackParamAtCluster1.SetRemovable(kTRUE); | |
96ebe67e | 848 | newTrack->AddTrackParamAtCluster(extrapTrackParamAtCluster1,*clusterCh1); |
019df241 | 849 | fNRecTracks++; |
850 | ||
851 | // Printout for debuging | |
852 | if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
96ebe67e | 853 | cout << "FollowLinearTrackInStation: added one cluster in chamber(1..): " << ch1+1 << endl; |
019df241 | 854 | if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump(); |
855 | } | |
856 | ||
96ebe67e | 857 | } else if (chi2WithOneCluster < bestChi2WithOneCluster) { |
858 | // keep track of the best cluster except if a couple of clusters has already been found | |
859 | bestChi2WithOneCluster = chi2WithOneCluster; | |
860 | bestTrackParamAtCluster1 = extrapTrackParamAtCluster1; | |
019df241 | 861 | } |
862 | ||
863 | } | |
864 | ||
865 | } | |
866 | ||
867 | } | |
868 | ||
869 | // fill out the best track if required else clean up the fRecTracksPtr array | |
3304fa09 | 870 | if (!AliMUONReconstructor::GetRecoParam()->TrackAllTracks()) { |
96ebe67e | 871 | if (foundTwoClusters) { |
872 | bestTrackParamAtCluster1.SetRemovable(kTRUE); | |
873 | trackCandidate.AddTrackParamAtCluster(bestTrackParamAtCluster1,*(bestTrackParamAtCluster1.GetClusterPtr())); | |
874 | bestTrackParamAtCluster2.SetRemovable(kTRUE); | |
875 | trackCandidate.AddTrackParamAtCluster(bestTrackParamAtCluster2,*(bestTrackParamAtCluster2.GetClusterPtr())); | |
019df241 | 876 | |
877 | // Printout for debuging | |
878 | if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
96ebe67e | 879 | cout << "FollowLinearTrackInStation: added the two best clusters in station(1..): " << nextStation+1 << endl; |
019df241 | 880 | if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump(); |
881 | } | |
882 | ||
96ebe67e | 883 | } else if (foundOneCluster) { |
9bf6860b | 884 | if (AliMUONReconstructor::GetRecoParam()->RequestStation(nextStation)) |
885 | bestTrackParamAtCluster1.SetRemovable(kFALSE); | |
886 | else bestTrackParamAtCluster1.SetRemovable(kTRUE); | |
96ebe67e | 887 | trackCandidate.AddTrackParamAtCluster(bestTrackParamAtCluster1,*(bestTrackParamAtCluster1.GetClusterPtr())); |
019df241 | 888 | |
889 | // Printout for debuging | |
890 | if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
96ebe67e | 891 | cout << "FollowLinearTrackInStation: added the best cluster in chamber(1..): " << bestTrackParamAtCluster1.GetClusterPtr()->GetChamberId()+1 << endl; |
019df241 | 892 | if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump(); |
893 | } | |
894 | ||
dd230855 | 895 | } else { |
96ebe67e | 896 | delete [] clusterCh1Used; |
dd230855 | 897 | return kFALSE; |
898 | } | |
019df241 | 899 | |
96ebe67e | 900 | } else if (foundOneCluster || foundTwoClusters) { |
019df241 | 901 | |
902 | // remove obsolete track | |
903 | fRecTracksPtr->Remove(&trackCandidate); | |
904 | fNRecTracks--; | |
905 | ||
dd230855 | 906 | } else { |
96ebe67e | 907 | delete [] clusterCh1Used; |
dd230855 | 908 | return kFALSE; |
909 | } | |
ea94c18b | 910 | |
96ebe67e | 911 | delete [] clusterCh1Used; |
019df241 | 912 | return kTRUE; |
ea94c18b | 913 | |
914 | } | |
915 | ||
7332f213 | 916 | //__________________________________________________________________________ |
917 | void AliMUONVTrackReconstructor::ImproveTracks() | |
918 | { | |
919 | /// Improve tracks by removing clusters with local chi2 highter than the defined cut | |
920 | /// Recompute track parameters and covariances at the remaining clusters | |
921 | AliDebug(1,"Enter ImproveTracks"); | |
922 | ||
923 | AliMUONTrack *track, *nextTrack; | |
924 | ||
7332f213 | 925 | track = (AliMUONTrack*) fRecTracksPtr->First(); |
926 | while (track) { | |
927 | ||
928 | // prepare next track in case the actual track is suppressed | |
929 | nextTrack = (AliMUONTrack*) fRecTracksPtr->After(track); | |
930 | ||
931 | ImproveTrack(*track); | |
932 | ||
933 | // remove track if improvement failed | |
934 | if (!track->IsImproved()) { | |
935 | fRecTracksPtr->Remove(track); | |
936 | fNRecTracks--; | |
937 | } | |
938 | ||
939 | track = nextTrack; | |
940 | } | |
941 | ||
942 | // compress the array in case of some tracks have been removed | |
943 | fRecTracksPtr->Compress(); | |
944 | ||
945 | } | |
946 | ||
947 | //__________________________________________________________________________ | |
948 | void AliMUONVTrackReconstructor::Finalize() | |
949 | { | |
950 | /// Recompute track parameters and covariances at each attached cluster from those at the first one | |
951 | ||
952 | AliMUONTrack *track; | |
953 | ||
954 | track = (AliMUONTrack*) fRecTracksPtr->First(); | |
955 | while (track) { | |
956 | ||
957 | FinalizeTrack(*track); | |
958 | ||
959 | track = (AliMUONTrack*) fRecTracksPtr->After(track); | |
960 | ||
961 | } | |
962 | ||
963 | } | |
964 | ||
965 | //__________________________________________________________________________ | |
7ec3b9cf | 966 | void AliMUONVTrackReconstructor::ValidateTracksWithTrigger(AliMUONVTrackStore& trackStore, |
967 | const AliMUONVTriggerTrackStore& triggerTrackStore, | |
968 | const AliMUONVTriggerStore& triggerStore, | |
969 | const AliMUONTrackHitPattern& trackHitPattern) | |
8d0843c6 | 970 | { |
971 | /// Try to match track from tracking system with trigger track | |
b709ac13 | 972 | AliCodeTimerAuto(""); |
fda59e58 | 973 | |
683cb6c5 | 974 | trackHitPattern.ExecuteValidation(trackStore, triggerTrackStore, triggerStore); |
8d0843c6 | 975 | } |
976 | ||
ea94c18b | 977 | //__________________________________________________________________________ |
978 | void AliMUONVTrackReconstructor::EventReconstructTrigger(const AliMUONTriggerCircuit& circuit, | |
979 | const AliMUONVTriggerStore& triggerStore, | |
980 | AliMUONVTriggerTrackStore& triggerTrackStore) | |
8d0843c6 | 981 | { |
71a2d3aa | 982 | /// To make the trigger tracks from Local Trigger |
7ec3b9cf | 983 | AliDebug(1, ""); |
b709ac13 | 984 | AliCodeTimerAuto(""); |
7ec3b9cf | 985 | |
986 | AliMUONGlobalTrigger* globalTrigger = triggerStore.Global(); | |
e6b25a6e | 987 | |
7ec3b9cf | 988 | UChar_t gloTrigPat = 0; |
e6b25a6e | 989 | |
7ec3b9cf | 990 | if (globalTrigger) |
991 | { | |
992 | gloTrigPat = globalTrigger->GetGlobalResponse(); | |
e6b25a6e | 993 | } |
994 | ||
7ec3b9cf | 995 | TIter next(triggerStore.CreateIterator()); |
996 | AliMUONLocalTrigger* locTrg(0x0); | |
8d0843c6 | 997 | |
e6b25a6e | 998 | Float_t z11 = AliMUONConstants::DefaultChamberZ(10); |
999 | Float_t z21 = AliMUONConstants::DefaultChamberZ(12); | |
7cf63da6 | 1000 | |
7ec3b9cf | 1001 | AliMUONTriggerTrack triggerTrack; |
1002 | ||
1003 | while ( ( locTrg = static_cast<AliMUONLocalTrigger*>(next()) ) ) | |
1004 | { | |
d72d7b9e | 1005 | Bool_t xTrig=locTrg->IsTrigX(); |
1006 | Bool_t yTrig=locTrg->IsTrigY(); | |
7ec3b9cf | 1007 | |
32ab62c9 | 1008 | Int_t localBoardId = locTrg->LoCircuit(); |
7ec3b9cf | 1009 | |
1010 | if (xTrig && yTrig) | |
1011 | { // make Trigger Track if trigger in X and Y | |
8b0baca4 | 1012 | |
32ab62c9 | 1013 | Float_t y11 = circuit.GetY11Pos(localBoardId, locTrg->LoStripX()); |
7ec3b9cf | 1014 | // need first to convert deviation to [0-30] |
1015 | // (see AliMUONLocalTriggerBoard::LocalTrigger) | |
d72d7b9e | 1016 | Int_t deviation = locTrg->GetDeviation(); |
7ec3b9cf | 1017 | Int_t stripX21 = locTrg->LoStripX()+deviation+1; |
32ab62c9 | 1018 | Float_t y21 = circuit.GetY21Pos(localBoardId, stripX21); |
1019 | Float_t x11 = circuit.GetX11Pos(localBoardId, locTrg->LoStripY()); | |
7ec3b9cf | 1020 | |
1021 | AliDebug(1, Form(" MakeTriggerTrack %d %d %d %d %f %f %f \n",locTrg->LoCircuit(), | |
1022 | locTrg->LoStripX(),locTrg->LoStripX()+locTrg->LoDev()+1,locTrg->LoStripY(),y11, y21, x11)); | |
1023 | ||
1024 | Float_t thetax = TMath::ATan2( x11 , z11 ); | |
1025 | Float_t thetay = TMath::ATan2( (y21-y11) , (z21-z11) ); | |
1026 | ||
1027 | triggerTrack.SetX11(x11); | |
1028 | triggerTrack.SetY11(y11); | |
1029 | triggerTrack.SetThetax(thetax); | |
1030 | triggerTrack.SetThetay(thetay); | |
1031 | triggerTrack.SetGTPattern(gloTrigPat); | |
32ab62c9 | 1032 | triggerTrack.SetLoTrgNum(localBoardId); |
7ec3b9cf | 1033 | |
1034 | triggerTrackStore.Add(triggerTrack); | |
1035 | } // board is fired | |
e6b25a6e | 1036 | } // end of loop on Local Trigger |
8d0843c6 | 1037 | } |
ea94c18b | 1038 |