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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 |
ad3c6eda | 30 | /// tracking algorithms. They can be changed through the AliMUONRecoParam object |
31 | /// set in the reconstruction macro or read from the CDB | |
32 | /// (see methods in AliMUONRecoParam.h file for details) | |
96ebe67e | 33 | /// |
34 | /// Main parameters and options are: | |
dfb547bf | 35 | /// - *fgkSigmaToCutForTracking* : quality cut used to select new clusters to be |
36 | /// attached to the track candidate and to select good tracks. | |
019df241 | 37 | /// - *fgkMakeTrackCandidatesFast* : if this flag is set to 'true', the track candidates |
38 | /// are made assuming linear propagation between stations 4 and 5. | |
dfb547bf | 39 | /// - *fgkTrackAllTracks* : according to the value of this flag, in case that several |
40 | /// new clusters pass the quality cut, either we consider all the possibilities | |
41 | /// (duplicating tracks) or we attach only the best cluster. | |
42 | /// - *fgkRecoverTracks* : if this flag is set to 'true', we try to recover the tracks | |
43 | /// lost during the tracking by removing the worst of the 2 clusters attached in the | |
44 | /// previous station. | |
45 | /// - *fgkImproveTracks* : if this flag is set to 'true', we try to improve the quality | |
46 | /// of the tracks at the end of the tracking by removing clusters that do not pass | |
3304fa09 | 47 | /// new quality cut (the track is removed is it does not contain enough cluster anymore). |
48 | /// - *fgkComplementTracks* : if this flag is set to 'true', we try to improve the quality | |
49 | /// of the tracks at the end of the tracking by adding potentially missing clusters | |
50 | /// (we may have 2 clusters in the same chamber because of the overlapping of detection | |
51 | /// elements, which is not handle by the tracking algorithm). | |
dfb547bf | 52 | /// - *fgkSigmaToCutForImprovement* : quality cut used when we try to improve the |
53 | /// quality of the tracks. | |
54 | /// | |
c4ee792d | 55 | /// \author Philippe Pillot |
3d1463c8 | 56 | //----------------------------------------------------------------------------- |
8d0843c6 | 57 | |
8d0843c6 | 58 | #include "AliMUONVTrackReconstructor.h" |
7ec3b9cf | 59 | |
8d0843c6 | 60 | #include "AliMUONConstants.h" |
208f139e | 61 | #include "AliMUONObjectPair.h" |
8d0843c6 | 62 | #include "AliMUONTriggerTrack.h" |
e1a10d41 | 63 | #include "AliMUONTriggerCircuit.h" |
8d0843c6 | 64 | #include "AliMUONLocalTrigger.h" |
65 | #include "AliMUONGlobalTrigger.h" | |
8d0843c6 | 66 | #include "AliMUONTrack.h" |
37827b29 | 67 | #include "AliMUONTrackParam.h" |
68 | #include "AliMUONTrackExtrap.h" | |
7771752e | 69 | #include "AliMUONTrackHitPattern.h" |
7ec3b9cf | 70 | #include "AliMUONVTrackStore.h" |
71 | #include "AliMUONVClusterStore.h" | |
2060b217 | 72 | #include "AliMUONVCluster.h" |
1fef78c8 | 73 | #include "AliMUONVClusterServer.h" |
7ec3b9cf | 74 | #include "AliMUONVTriggerStore.h" |
75 | #include "AliMUONVTriggerTrackStore.h" | |
5a240757 | 76 | #include "AliMUONRecoParam.h" |
77 | ||
ea94c18b | 78 | #include "AliMpDEManager.h" |
1fef78c8 | 79 | #include "AliMpArea.h" |
ea94c18b | 80 | |
81 | #include "AliLog.h" | |
b709ac13 | 82 | #include "AliCodeTimer.h" |
ea94c18b | 83 | #include "AliTracker.h" |
8d0843c6 | 84 | |
4889d34c | 85 | #include <TClonesArray.h> |
86 | #include <TMath.h> | |
ea94c18b | 87 | #include <TMatrixD.h> |
1fef78c8 | 88 | #include <TVector2.h> |
ea94c18b | 89 | |
90 | #include <Riostream.h> | |
4889d34c | 91 | |
78649106 | 92 | /// \cond CLASSIMP |
8d0843c6 | 93 | ClassImp(AliMUONVTrackReconstructor) // Class implementation in ROOT context |
78649106 | 94 | /// \endcond |
8d0843c6 | 95 | |
ea94c18b | 96 | //__________________________________________________________________________ |
a0dc65b4 | 97 | AliMUONVTrackReconstructor::AliMUONVTrackReconstructor(const AliMUONRecoParam* recoParam, |
98 | AliMUONVClusterServer* clusterServer) | |
99 | : TObject(), | |
100 | fRecTracksPtr(0x0), | |
101 | fNRecTracks(0), | |
102 | fClusterServer(clusterServer), | |
5a240757 | 103 | fkRecoParam(recoParam) |
8d0843c6 | 104 | { |
105 | /// Constructor for class AliMUONVTrackReconstructor | |
b1fea02e | 106 | /// WARNING: if clusterServer=0x0, no clusterization will be possible at this level |
ea94c18b | 107 | |
108 | // Memory allocation for the TClonesArray of reconstructed tracks | |
96ebe67e | 109 | fRecTracksPtr = new TClonesArray("AliMUONTrack", 100); |
7ec3b9cf | 110 | |
208f139e | 111 | // set the magnetic field for track extrapolations |
f7a1cc68 | 112 | AliMUONTrackExtrap::SetField(); |
8d0843c6 | 113 | } |
114 | ||
115 | //__________________________________________________________________________ | |
ea94c18b | 116 | AliMUONVTrackReconstructor::~AliMUONVTrackReconstructor() |
8d0843c6 | 117 | { |
118 | /// Destructor for class AliMUONVTrackReconstructor | |
ea94c18b | 119 | delete fRecTracksPtr; |
8d0843c6 | 120 | } |
121 | ||
ea94c18b | 122 | //__________________________________________________________________________ |
123 | void AliMUONVTrackReconstructor::ResetTracks() | |
124 | { | |
125 | /// To reset the TClonesArray of reconstructed tracks | |
126 | if (fRecTracksPtr) fRecTracksPtr->Clear("C"); | |
127 | fNRecTracks = 0; | |
128 | return; | |
129 | } | |
130 | ||
131 | //__________________________________________________________________________ | |
1fef78c8 | 132 | void AliMUONVTrackReconstructor::EventReconstruct(AliMUONVClusterStore& clusterStore, AliMUONVTrackStore& trackStore) |
ea94c18b | 133 | { |
134 | /// To reconstruct one event | |
135 | AliDebug(1,""); | |
b709ac13 | 136 | AliCodeTimerAuto(""); |
ea94c18b | 137 | |
96ebe67e | 138 | // Reset array of tracks |
ea94c18b | 139 | ResetTracks(); |
2060b217 | 140 | |
9bf6860b | 141 | // Look for candidates from clusters in stations(1..) 4 and 5 |
96ebe67e | 142 | MakeTrackCandidates(clusterStore); |
143 | ||
9bf6860b | 144 | // Look for extra candidates from clusters in stations(1..) 4 and 5 |
a0dc65b4 | 145 | if (GetRecoParam()->MakeMoreTrackCandidates()) MakeMoreTrackCandidates(clusterStore); |
9bf6860b | 146 | |
96ebe67e | 147 | // Stop tracking if no candidate found |
ea94c18b | 148 | if (fRecTracksPtr->GetEntriesFast() == 0) return; |
96ebe67e | 149 | |
ea94c18b | 150 | // Follow tracks in stations(1..) 3, 2 and 1 |
96ebe67e | 151 | FollowTracks(clusterStore); |
152 | ||
b709ac13 | 153 | // Complement the reconstructed tracks |
a0dc65b4 | 154 | if (GetRecoParam()->ComplementTracks()) ComplementTracks(clusterStore); |
96ebe67e | 155 | |
ea94c18b | 156 | // Improve the reconstructed tracks |
a0dc65b4 | 157 | if (GetRecoParam()->ImproveTracks()) ImproveTracks(); |
96ebe67e | 158 | |
c59f70b9 | 159 | // Remove connected tracks |
160 | if (GetRecoParam()->RemoveConnectedTracksInSt12()) RemoveConnectedTracks(kFALSE); | |
161 | else RemoveConnectedTracks(kTRUE); | |
96ebe67e | 162 | |
ea94c18b | 163 | // Fill AliMUONTrack data members |
164 | Finalize(); | |
96ebe67e | 165 | |
166 | // Add tracks to MUON data container | |
167 | for (Int_t i=0; i<fNRecTracks; ++i) | |
168 | { | |
169 | AliMUONTrack * track = (AliMUONTrack*) fRecTracksPtr->At(i); | |
7332f213 | 170 | track->SetUniqueID(i+1); |
96ebe67e | 171 | trackStore.Add(*track); |
172 | } | |
ea94c18b | 173 | } |
174 | ||
8d0843c6 | 175 | //__________________________________________________________________________ |
9bf6860b | 176 | TClonesArray* AliMUONVTrackReconstructor::MakeSegmentsBetweenChambers(const AliMUONVClusterStore& clusterStore, Int_t ch1, Int_t ch2) |
8d0843c6 | 177 | { |
9bf6860b | 178 | /// To make the list of segments from the list of clusters in the 2 given chambers. |
208f139e | 179 | /// Return a new TClonesArray of segments. |
180 | /// It is the responsibility of the user to delete it afterward. | |
9bf6860b | 181 | AliDebug(1,Form("Enter MakeSegmentsBetweenChambers (1..) %d-%d", ch1+1, ch2+1)); |
208f139e | 182 | |
96ebe67e | 183 | AliMUONVCluster *cluster1, *cluster2; |
208f139e | 184 | AliMUONObjectPair *segment; |
9bf6860b | 185 | Double_t nonBendingSlope = 0, bendingSlope = 0, impactParam = 0., bendingMomentum = 0.; // to avoid compilation warning |
7ec3b9cf | 186 | |
96ebe67e | 187 | // Create iterators to loop over clusters in both chambers |
188 | TIter nextInCh1(clusterStore.CreateChamberIterator(ch1,ch1)); | |
189 | TIter nextInCh2(clusterStore.CreateChamberIterator(ch2,ch2)); | |
190 | ||
208f139e | 191 | // list of segments |
96ebe67e | 192 | TClonesArray *segments = new TClonesArray("AliMUONObjectPair", 100); |
7ec3b9cf | 193 | |
96ebe67e | 194 | // Loop over clusters in the first chamber of the station |
195 | while ( ( cluster1 = static_cast<AliMUONVCluster*>(nextInCh1()) ) ) { | |
196 | ||
197 | // reset cluster iterator of chamber 2 | |
198 | nextInCh2.Reset(); | |
199 | ||
200 | // Loop over clusters in the second chamber of the station | |
201 | while ( ( cluster2 = static_cast<AliMUONVCluster*>(nextInCh2()) ) ) { | |
202 | ||
9bf6860b | 203 | // non bending slope |
204 | nonBendingSlope = (cluster1->GetX() - cluster2->GetX()) / (cluster1->GetZ() - cluster2->GetZ()); | |
205 | ||
9f093251 | 206 | // check if non bending slope is within tolerances |
a0dc65b4 | 207 | if (TMath::Abs(nonBendingSlope) > GetRecoParam()->GetMaxNonBendingSlope()) continue; |
9f093251 | 208 | |
96ebe67e | 209 | // bending slope |
210 | bendingSlope = (cluster1->GetY() - cluster2->GetY()) / (cluster1->GetZ() - cluster2->GetZ()); | |
211 | ||
9f093251 | 212 | // check the bending momentum of the bending slope depending if the field is ON or OFF |
213 | if (AliMUONTrackExtrap::IsFieldON()) { | |
214 | ||
215 | // impact parameter | |
216 | impactParam = cluster1->GetY() - cluster1->GetZ() * bendingSlope; | |
217 | ||
218 | // absolute value of bending momentum | |
219 | bendingMomentum = TMath::Abs(AliMUONTrackExtrap::GetBendingMomentumFromImpactParam(impactParam)); | |
220 | ||
221 | // check if bending momentum is within tolerances | |
a0dc65b4 | 222 | if (bendingMomentum < GetRecoParam()->GetMinBendingMomentum() || |
223 | bendingMomentum > GetRecoParam()->GetMaxBendingMomentum()) continue; | |
96ebe67e | 224 | |
9f093251 | 225 | } else { |
226 | ||
227 | // check if non bending slope is within tolerances | |
a0dc65b4 | 228 | if (TMath::Abs(bendingSlope) > GetRecoParam()->GetMaxBendingSlope()) continue; |
9f093251 | 229 | |
230 | } | |
231 | // make new segment | |
232 | segment = new ((*segments)[segments->GetLast()+1]) AliMUONObjectPair(cluster1, cluster2, kFALSE, kFALSE); | |
233 | ||
234 | // Printout for debug | |
235 | if (AliLog::GetGlobalDebugLevel() > 1) { | |
236 | cout << "segmentIndex(0...): " << segments->GetLast() << endl; | |
237 | segment->Dump(); | |
238 | cout << "Cluster in first chamber" << endl; | |
239 | cluster1->Print(); | |
240 | cout << "Cluster in second chamber" << endl; | |
241 | cluster2->Print(); | |
8d0843c6 | 242 | } |
96ebe67e | 243 | |
244 | } | |
245 | ||
246 | } | |
247 | ||
248 | // Printout for debug | |
9bf6860b | 249 | AliDebug(1,Form("chambers%d-%d: NSegments = %d ", ch1+1, ch2+1, segments->GetEntriesFast())); |
96ebe67e | 250 | |
208f139e | 251 | return segments; |
8d0843c6 | 252 | } |
253 | ||
ea94c18b | 254 | //__________________________________________________________________________ |
255 | void AliMUONVTrackReconstructor::RemoveIdenticalTracks() | |
256 | { | |
257 | /// To remove identical tracks: | |
96ebe67e | 258 | /// Tracks are considered identical if they have all their clusters in common. |
259 | /// One keeps the track with the larger number of clusters if need be | |
ea94c18b | 260 | AliMUONTrack *track1, *track2, *trackToRemove; |
96ebe67e | 261 | Int_t clustersInCommon, nClusters1, nClusters2; |
ea94c18b | 262 | Bool_t removedTrack1; |
263 | // Loop over first track of the pair | |
264 | track1 = (AliMUONTrack*) fRecTracksPtr->First(); | |
265 | while (track1) { | |
266 | removedTrack1 = kFALSE; | |
96ebe67e | 267 | nClusters1 = track1->GetNClusters(); |
ea94c18b | 268 | // Loop over second track of the pair |
269 | track2 = (AliMUONTrack*) fRecTracksPtr->After(track1); | |
270 | while (track2) { | |
96ebe67e | 271 | nClusters2 = track2->GetNClusters(); |
272 | // number of clusters in common between two tracks | |
273 | clustersInCommon = track1->ClustersInCommon(track2); | |
ea94c18b | 274 | // check for identical tracks |
96ebe67e | 275 | if ((clustersInCommon == nClusters1) || (clustersInCommon == nClusters2)) { |
ea94c18b | 276 | // decide which track to remove |
96ebe67e | 277 | if (nClusters2 > nClusters1) { |
ea94c18b | 278 | // remove track1 and continue the first loop with the track next to track1 |
279 | trackToRemove = track1; | |
280 | track1 = (AliMUONTrack*) fRecTracksPtr->After(track1); | |
281 | fRecTracksPtr->Remove(trackToRemove); | |
282 | fRecTracksPtr->Compress(); // this is essential to retrieve the TClonesArray afterwards | |
283 | fNRecTracks--; | |
284 | removedTrack1 = kTRUE; | |
285 | break; | |
286 | } else { | |
287 | // remove track2 and continue the second loop with the track next to track2 | |
288 | trackToRemove = track2; | |
289 | track2 = (AliMUONTrack*) fRecTracksPtr->After(track2); | |
290 | fRecTracksPtr->Remove(trackToRemove); | |
291 | fRecTracksPtr->Compress(); // this is essential to retrieve the TClonesArray afterwards | |
292 | fNRecTracks--; | |
293 | } | |
294 | } else track2 = (AliMUONTrack*) fRecTracksPtr->After(track2); | |
295 | } // track2 | |
296 | if (removedTrack1) continue; | |
297 | track1 = (AliMUONTrack*) fRecTracksPtr->After(track1); | |
298 | } // track1 | |
299 | return; | |
300 | } | |
301 | ||
302 | //__________________________________________________________________________ | |
303 | void AliMUONVTrackReconstructor::RemoveDoubleTracks() | |
304 | { | |
305 | /// To remove double tracks: | |
96ebe67e | 306 | /// Tracks are considered identical if more than half of the clusters of the track |
307 | /// which has the smaller number of clusters are in common with the other track. | |
308 | /// Among two identical tracks, one keeps the track with the larger number of clusters | |
ea94c18b | 309 | /// or, if these numbers are equal, the track with the minimum chi2. |
310 | AliMUONTrack *track1, *track2, *trackToRemove; | |
96ebe67e | 311 | Int_t clustersInCommon, nClusters1, nClusters2; |
ea94c18b | 312 | Bool_t removedTrack1; |
313 | // Loop over first track of the pair | |
314 | track1 = (AliMUONTrack*) fRecTracksPtr->First(); | |
315 | while (track1) { | |
316 | removedTrack1 = kFALSE; | |
96ebe67e | 317 | nClusters1 = track1->GetNClusters(); |
ea94c18b | 318 | // Loop over second track of the pair |
319 | track2 = (AliMUONTrack*) fRecTracksPtr->After(track1); | |
320 | while (track2) { | |
96ebe67e | 321 | nClusters2 = track2->GetNClusters(); |
322 | // number of clusters in common between two tracks | |
323 | clustersInCommon = track1->ClustersInCommon(track2); | |
ea94c18b | 324 | // check for identical tracks |
96ebe67e | 325 | if (((nClusters1 < nClusters2) && (2 * clustersInCommon > nClusters1)) || (2 * clustersInCommon > nClusters2)) { |
ea94c18b | 326 | // decide which track to remove |
96ebe67e | 327 | if ((nClusters1 > nClusters2) || ((nClusters1 == nClusters2) && (track1->GetGlobalChi2() <= track2->GetGlobalChi2()))) { |
ea94c18b | 328 | // remove track2 and continue the second loop with the track next to track2 |
329 | trackToRemove = track2; | |
330 | track2 = (AliMUONTrack*) fRecTracksPtr->After(track2); | |
331 | fRecTracksPtr->Remove(trackToRemove); | |
c59f70b9 | 332 | fRecTracksPtr->Compress(); // this is essential to retrieve the TClonesArray afterwards |
333 | fNRecTracks--; | |
334 | } else { | |
335 | // else remove track1 and continue the first loop with the track next to track1 | |
336 | trackToRemove = track1; | |
337 | track1 = (AliMUONTrack*) fRecTracksPtr->After(track1); | |
338 | fRecTracksPtr->Remove(trackToRemove); | |
339 | fRecTracksPtr->Compress(); // this is essential to retrieve the TClonesArray afterwards | |
340 | fNRecTracks--; | |
341 | removedTrack1 = kTRUE; | |
342 | break; | |
343 | } | |
344 | } else track2 = (AliMUONTrack*) fRecTracksPtr->After(track2); | |
345 | } // track2 | |
346 | if (removedTrack1) continue; | |
347 | track1 = (AliMUONTrack*) fRecTracksPtr->After(track1); | |
348 | } // track1 | |
349 | return; | |
350 | } | |
351 | ||
352 | //__________________________________________________________________________ | |
353 | void AliMUONVTrackReconstructor::RemoveConnectedTracks(Bool_t inSt345) | |
354 | { | |
355 | /// To remove double tracks: | |
356 | /// Tracks are considered identical if they share 1 cluster or more. | |
357 | /// If inSt345=kTRUE only stations 3, 4 and 5 are considered. | |
358 | /// Among two identical tracks, one keeps the track with the larger number of clusters | |
359 | /// or, if these numbers are equal, the track with the minimum chi2. | |
360 | AliMUONTrack *track1, *track2, *trackToRemove; | |
361 | Int_t clustersInCommon, nClusters1, nClusters2; | |
362 | Bool_t removedTrack1; | |
363 | // Loop over first track of the pair | |
364 | track1 = (AliMUONTrack*) fRecTracksPtr->First(); | |
365 | while (track1) { | |
366 | removedTrack1 = kFALSE; | |
367 | nClusters1 = track1->GetNClusters(); | |
368 | // Loop over second track of the pair | |
369 | track2 = (AliMUONTrack*) fRecTracksPtr->After(track1); | |
370 | while (track2) { | |
371 | nClusters2 = track2->GetNClusters(); | |
372 | // number of clusters in common between two tracks | |
373 | clustersInCommon = track1->ClustersInCommon(track2, inSt345); | |
374 | // check for identical tracks | |
375 | if (clustersInCommon > 0) { | |
376 | // decide which track to remove | |
377 | if ((nClusters1 > nClusters2) || ((nClusters1 == nClusters2) && (track1->GetGlobalChi2() <= track2->GetGlobalChi2()))) { | |
378 | // remove track2 and continue the second loop with the track next to track2 | |
379 | trackToRemove = track2; | |
380 | track2 = (AliMUONTrack*) fRecTracksPtr->After(track2); | |
381 | fRecTracksPtr->Remove(trackToRemove); | |
ea94c18b | 382 | fRecTracksPtr->Compress(); // this is essential to retrieve the TClonesArray afterwards |
383 | fNRecTracks--; | |
384 | } else { | |
385 | // else remove track1 and continue the first loop with the track next to track1 | |
386 | trackToRemove = track1; | |
387 | track1 = (AliMUONTrack*) fRecTracksPtr->After(track1); | |
388 | fRecTracksPtr->Remove(trackToRemove); | |
389 | fRecTracksPtr->Compress(); // this is essential to retrieve the TClonesArray afterwards | |
390 | fNRecTracks--; | |
391 | removedTrack1 = kTRUE; | |
392 | break; | |
393 | } | |
394 | } else track2 = (AliMUONTrack*) fRecTracksPtr->After(track2); | |
395 | } // track2 | |
396 | if (removedTrack1) continue; | |
397 | track1 = (AliMUONTrack*) fRecTracksPtr->After(track1); | |
398 | } // track1 | |
399 | return; | |
400 | } | |
401 | ||
1fef78c8 | 402 | //__________________________________________________________________________ |
9bf6860b | 403 | void AliMUONVTrackReconstructor::AskForNewClustersInChamber(const AliMUONTrackParam &trackParam, |
404 | AliMUONVClusterStore& clusterStore, Int_t chamber) | |
1fef78c8 | 405 | { |
406 | /// Ask the clustering to reconstruct new clusters around the track candidate position | |
1fef78c8 | 407 | |
9bf6860b | 408 | // check if the current chamber is useable |
a0dc65b4 | 409 | if (!fClusterServer || !GetRecoParam()->UseChamber(chamber)) return; |
1fef78c8 | 410 | |
9bf6860b | 411 | // maximum distance between the center of the chamber and a detection element |
412 | // (accounting for the inclination of the chamber) | |
b89ac3d6 | 413 | static const Double_t kMaxDZ = 15.; // 15 cm |
1fef78c8 | 414 | |
9bf6860b | 415 | // extrapolate track parameters to the chamber |
416 | AliMUONTrackParam extrapTrackParam(trackParam); | |
417 | AliMUONTrackExtrap::ExtrapToZCov(&extrapTrackParam, AliMUONConstants::DefaultChamberZ(chamber)); | |
418 | ||
419 | // build the searching area using the track resolution and the maximum-distance-to-track value | |
420 | const TMatrixD& kParamCov = extrapTrackParam.GetCovariances(); | |
b89ac3d6 | 421 | Double_t errX2 = kParamCov(0,0) + kMaxDZ * kMaxDZ * kParamCov(1,1) + 2. * kMaxDZ * TMath::Abs(kParamCov(0,1)); |
422 | Double_t errY2 = kParamCov(2,2) + kMaxDZ * kMaxDZ * kParamCov(3,3) + 2. * kMaxDZ * TMath::Abs(kParamCov(2,3)); | |
423 | Double_t dX = TMath::Abs(trackParam.GetNonBendingSlope()) * kMaxDZ + | |
a0dc65b4 | 424 | GetRecoParam()->GetMaxNonBendingDistanceToTrack() + |
425 | GetRecoParam()->GetSigmaCutForTracking() * TMath::Sqrt(errX2); | |
b89ac3d6 | 426 | Double_t dY = TMath::Abs(trackParam.GetBendingSlope()) * kMaxDZ + |
a0dc65b4 | 427 | GetRecoParam()->GetMaxBendingDistanceToTrack() + |
428 | GetRecoParam()->GetSigmaCutForTracking() * TMath::Sqrt(errY2); | |
9bf6860b | 429 | TVector2 dimensions(dX, dY); |
1fef78c8 | 430 | TVector2 position(extrapTrackParam.GetNonBendingCoor(), extrapTrackParam.GetBendingCoor()); |
9bf6860b | 431 | AliMpArea area(position, dimensions); |
1fef78c8 | 432 | |
433 | // ask to cluterize in the given area of the given chamber | |
35be7ed7 | 434 | fClusterServer->Clusterize(chamber, clusterStore, area, GetRecoParam()); |
1fef78c8 | 435 | |
9bf6860b | 436 | } |
437 | ||
438 | //__________________________________________________________________________ | |
439 | void AliMUONVTrackReconstructor::AskForNewClustersInStation(const AliMUONTrackParam &trackParam, | |
440 | AliMUONVClusterStore& clusterStore, Int_t station) | |
441 | { | |
442 | /// Ask the clustering to reconstruct new clusters around the track candidate position | |
443 | /// in the 2 chambers of the given station | |
444 | AskForNewClustersInChamber(trackParam, clusterStore, 2*station+1); | |
445 | AskForNewClustersInChamber(trackParam, clusterStore, 2*station); | |
1fef78c8 | 446 | } |
447 | ||
ea94c18b | 448 | //__________________________________________________________________________ |
96ebe67e | 449 | Double_t AliMUONVTrackReconstructor::TryOneCluster(const AliMUONTrackParam &trackParam, AliMUONVCluster* cluster, |
1fef78c8 | 450 | AliMUONTrackParam &trackParamAtCluster, Bool_t updatePropagator) |
ea94c18b | 451 | { |
96ebe67e | 452 | /// Test the compatibility between the track and the cluster (using trackParam's covariance matrix): |
ea94c18b | 453 | /// return the corresponding Chi2 |
96ebe67e | 454 | /// return trackParamAtCluster |
ea94c18b | 455 | |
96ebe67e | 456 | // extrapolate track parameters and covariances at the z position of the tested cluster |
457 | trackParamAtCluster = trackParam; | |
458 | AliMUONTrackExtrap::ExtrapToZCov(&trackParamAtCluster, cluster->GetZ(), updatePropagator); | |
ea94c18b | 459 | |
96ebe67e | 460 | // set pointer to cluster into trackParamAtCluster |
461 | trackParamAtCluster.SetClusterPtr(cluster); | |
ea94c18b | 462 | |
96ebe67e | 463 | // Set differences between trackParam and cluster in the bending and non bending directions |
464 | Double_t dX = cluster->GetX() - trackParamAtCluster.GetNonBendingCoor(); | |
465 | Double_t dY = cluster->GetY() - trackParamAtCluster.GetBendingCoor(); | |
ea94c18b | 466 | |
019df241 | 467 | // Calculate errors and covariances |
96ebe67e | 468 | const TMatrixD& kParamCov = trackParamAtCluster.GetCovariances(); |
469 | Double_t sigmaX2 = kParamCov(0,0) + cluster->GetErrX2(); | |
470 | Double_t sigmaY2 = kParamCov(2,2) + cluster->GetErrY2(); | |
019df241 | 471 | |
472 | // Compute chi2 | |
96ebe67e | 473 | return dX * dX / sigmaX2 + dY * dY / sigmaY2; |
019df241 | 474 | |
475 | } | |
476 | ||
477 | //__________________________________________________________________________ | |
5a240757 | 478 | Bool_t AliMUONVTrackReconstructor::TryOneClusterFast(const AliMUONTrackParam &trackParam, const AliMUONVCluster* cluster) |
019df241 | 479 | { |
9bf6860b | 480 | /// Test the compatibility between the track and the cluster |
481 | /// given the track resolution + the maximum-distance-to-track value | |
482 | /// and assuming linear propagation of the track: | |
019df241 | 483 | /// return kTRUE if they are compatibles |
484 | ||
96ebe67e | 485 | Double_t dZ = cluster->GetZ() - trackParam.GetZ(); |
486 | Double_t dX = cluster->GetX() - (trackParam.GetNonBendingCoor() + trackParam.GetNonBendingSlope() * dZ); | |
487 | Double_t dY = cluster->GetY() - (trackParam.GetBendingCoor() + trackParam.GetBendingSlope() * dZ); | |
9bf6860b | 488 | const TMatrixD& kParamCov = trackParam.GetCovariances(); |
489 | Double_t errX2 = kParamCov(0,0) + dZ * dZ * kParamCov(1,1) + 2. * dZ * kParamCov(0,1); | |
490 | Double_t errY2 = kParamCov(2,2) + dZ * dZ * kParamCov(3,3) + 2. * dZ * kParamCov(2,3); | |
491 | ||
a0dc65b4 | 492 | Double_t dXmax = GetRecoParam()->GetSigmaCutForTracking() * TMath::Sqrt(errX2) + |
493 | GetRecoParam()->GetMaxNonBendingDistanceToTrack(); | |
494 | Double_t dYmax = GetRecoParam()->GetSigmaCutForTracking() * TMath::Sqrt(errY2) + | |
495 | GetRecoParam()->GetMaxBendingDistanceToTrack(); | |
019df241 | 496 | |
9bf6860b | 497 | if (TMath::Abs(dX) > dXmax || TMath::Abs(dY) > dYmax) return kFALSE; |
019df241 | 498 | |
499 | return kTRUE; | |
500 | ||
501 | } | |
502 | ||
503 | //__________________________________________________________________________ | |
96ebe67e | 504 | Double_t AliMUONVTrackReconstructor::TryTwoClustersFast(const AliMUONTrackParam &trackParamAtCluster1, AliMUONVCluster* cluster2, |
505 | AliMUONTrackParam &trackParamAtCluster2) | |
019df241 | 506 | { |
96ebe67e | 507 | /// Test the compatibility between the track and the 2 clusters together (using trackParam's covariance matrix) |
508 | /// assuming linear propagation between the two clusters: | |
509 | /// return the corresponding Chi2 accounting for covariances between the 2 clusters | |
510 | /// return trackParamAtCluster2 | |
019df241 | 511 | |
96ebe67e | 512 | // extrapolate linearly track parameters and covariances at the z position of the second cluster |
513 | trackParamAtCluster2 = trackParamAtCluster1; | |
514 | AliMUONTrackExtrap::LinearExtrapToZ(&trackParamAtCluster2, cluster2->GetZ()); | |
019df241 | 515 | |
96ebe67e | 516 | // set pointer to cluster2 into trackParamAtCluster2 |
517 | trackParamAtCluster2.SetClusterPtr(cluster2); | |
019df241 | 518 | |
96ebe67e | 519 | // Set differences between track and clusters in the bending and non bending directions |
520 | AliMUONVCluster* cluster1 = trackParamAtCluster1.GetClusterPtr(); | |
521 | Double_t dX1 = cluster1->GetX() - trackParamAtCluster1.GetNonBendingCoor(); | |
522 | Double_t dX2 = cluster2->GetX() - trackParamAtCluster2.GetNonBendingCoor(); | |
523 | Double_t dY1 = cluster1->GetY() - trackParamAtCluster1.GetBendingCoor(); | |
524 | Double_t dY2 = cluster2->GetY() - trackParamAtCluster2.GetBendingCoor(); | |
019df241 | 525 | |
526 | // Calculate errors and covariances | |
96ebe67e | 527 | const TMatrixD& kParamCov1 = trackParamAtCluster1.GetCovariances(); |
528 | const TMatrixD& kParamCov2 = trackParamAtCluster2.GetCovariances(); | |
529 | Double_t dZ = trackParamAtCluster2.GetZ() - trackParamAtCluster1.GetZ(); | |
530 | Double_t sigma2X1 = kParamCov1(0,0) + cluster1->GetErrX2(); | |
531 | Double_t sigma2X2 = kParamCov2(0,0) + cluster2->GetErrX2(); | |
019df241 | 532 | Double_t covX1X2 = kParamCov1(0,0) + dZ * kParamCov1(0,1); |
96ebe67e | 533 | Double_t sigma2Y1 = kParamCov1(2,2) + cluster1->GetErrY2(); |
534 | Double_t sigma2Y2 = kParamCov2(2,2) + cluster2->GetErrY2(); | |
019df241 | 535 | Double_t covY1Y2 = kParamCov1(2,2) + dZ * kParamCov1(2,3); |
536 | ||
537 | // Compute chi2 | |
538 | Double_t detX = sigma2X1 * sigma2X2 - covX1X2 * covX1X2; | |
539 | Double_t detY = sigma2Y1 * sigma2Y2 - covY1Y2 * covY1Y2; | |
540 | if (detX == 0. || detY == 0.) return 1.e10; | |
541 | return (dX1 * dX1 * sigma2X2 + dX2 * dX2 * sigma2X1 - 2. * dX1 * dX2 * covX1X2) / detX | |
542 | + (dY1 * dY1 * sigma2Y2 + dY2 * dY2 * sigma2Y1 - 2. * dY1 * dY2 * covY1Y2) / detY; | |
543 | ||
544 | } | |
545 | ||
546 | //__________________________________________________________________________ | |
9bf6860b | 547 | Bool_t AliMUONVTrackReconstructor::FollowLinearTrackInChamber(AliMUONTrack &trackCandidate, const AliMUONVClusterStore& clusterStore, |
548 | Int_t nextChamber) | |
549 | { | |
550 | /// Follow trackCandidate in chamber(0..) nextChamber assuming linear propagation, and search for compatible cluster(s) | |
551 | /// Keep all possibilities or only the best one(s) according to the flag fgkTrackAllTracks: | |
552 | /// kTRUE: duplicate "trackCandidate" if there are several possibilities and add the new tracks at the end of | |
553 | /// fRecTracksPtr to avoid conficts with other track candidates at this current stage of the tracking procedure. | |
554 | /// Remove the obsolete "trackCandidate" at the end. | |
555 | /// kFALSE: add only the best cluster(s) to the "trackCandidate". Try to add a couple of clusters in priority. | |
556 | /// return kTRUE if new cluster(s) have been found (otherwise return kFALSE) | |
557 | AliDebug(1,Form("Enter FollowLinearTrackInChamber(1..) %d", nextChamber+1)); | |
558 | ||
559 | Double_t chi2WithOneCluster = 1.e10; | |
a0dc65b4 | 560 | Double_t maxChi2WithOneCluster = 2. * GetRecoParam()->GetSigmaCutForTracking() * |
561 | GetRecoParam()->GetSigmaCutForTracking(); // 2 because 2 quantities in chi2 | |
9bf6860b | 562 | Double_t bestChi2WithOneCluster = maxChi2WithOneCluster; |
563 | Bool_t foundOneCluster = kFALSE; | |
564 | AliMUONTrack *newTrack = 0x0; | |
565 | AliMUONVCluster *cluster; | |
566 | AliMUONTrackParam trackParam; | |
567 | AliMUONTrackParam extrapTrackParamAtCluster; | |
568 | AliMUONTrackParam bestTrackParamAtCluster; | |
569 | ||
570 | // Get track parameters according to the propagation direction | |
571 | if (nextChamber > 7) trackParam = *(AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->Last(); | |
572 | else trackParam = *(AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->First(); | |
573 | ||
574 | // Printout for debuging | |
575 | if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 2) || (AliLog::GetGlobalDebugLevel() >= 2)) { | |
576 | cout<<endl<<"Track parameters and covariances at first cluster:"<<endl; | |
577 | trackParam.GetParameters().Print(); | |
578 | trackParam.GetCovariances().Print(); | |
579 | } | |
580 | ||
581 | // Add MCS effect | |
582 | AliMUONTrackExtrap::AddMCSEffect(&trackParam,AliMUONConstants::ChamberThicknessInX0(),1.); | |
583 | ||
584 | // Printout for debuging | |
585 | if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
586 | cout << "FollowLinearTrackInChamber: look for cluster in chamber(1..): " << nextChamber+1 << endl; | |
587 | } | |
588 | ||
589 | // Create iterators to loop over clusters in chamber | |
590 | TIter next(clusterStore.CreateChamberIterator(nextChamber,nextChamber)); | |
591 | ||
592 | // look for candidates in chamber | |
593 | while ( ( cluster = static_cast<AliMUONVCluster*>(next()) ) ) { | |
594 | ||
595 | // try to add the current cluster fast | |
596 | if (!TryOneClusterFast(trackParam, cluster)) continue; | |
597 | ||
598 | // try to add the current cluster accuratly | |
599 | extrapTrackParamAtCluster = trackParam; | |
600 | AliMUONTrackExtrap::LinearExtrapToZ(&extrapTrackParamAtCluster, cluster->GetZ()); | |
601 | chi2WithOneCluster = TryOneCluster(extrapTrackParamAtCluster, cluster, extrapTrackParamAtCluster); | |
602 | ||
603 | // if good chi2 then consider to add cluster | |
604 | if (chi2WithOneCluster < maxChi2WithOneCluster) { | |
605 | foundOneCluster = kTRUE; | |
606 | ||
607 | // Printout for debuging | |
608 | if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
609 | cout << "FollowLinearTrackInChamber: found one cluster in chamber(1..): " << nextChamber+1 | |
610 | << " (Chi2 = " << chi2WithOneCluster << ")" << endl; | |
611 | cluster->Print(); | |
612 | } | |
613 | ||
a0dc65b4 | 614 | if (GetRecoParam()->TrackAllTracks()) { |
9bf6860b | 615 | // copy trackCandidate into a new track put at the end of fRecTracksPtr and add the new cluster |
616 | newTrack = new ((*fRecTracksPtr)[fRecTracksPtr->GetLast()+1]) AliMUONTrack(trackCandidate); | |
a0dc65b4 | 617 | if (GetRecoParam()->RequestStation(nextChamber/2)) |
9bf6860b | 618 | extrapTrackParamAtCluster.SetRemovable(kFALSE); |
619 | else extrapTrackParamAtCluster.SetRemovable(kTRUE); | |
620 | newTrack->AddTrackParamAtCluster(extrapTrackParamAtCluster,*cluster); | |
621 | fNRecTracks++; | |
622 | ||
623 | // Printout for debuging | |
624 | if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
625 | cout << "FollowLinearTrackInChamber: added one cluster in chamber(1..): " << nextChamber+1 << endl; | |
626 | if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump(); | |
627 | } | |
628 | ||
629 | } else if (chi2WithOneCluster < bestChi2WithOneCluster) { | |
630 | // keep track of the best cluster | |
631 | bestChi2WithOneCluster = chi2WithOneCluster; | |
632 | bestTrackParamAtCluster = extrapTrackParamAtCluster; | |
633 | } | |
634 | ||
635 | } | |
636 | ||
637 | } | |
638 | ||
639 | // fill out the best track if required else clean up the fRecTracksPtr array | |
a0dc65b4 | 640 | if (!GetRecoParam()->TrackAllTracks()) { |
9bf6860b | 641 | if (foundOneCluster) { |
a0dc65b4 | 642 | if (GetRecoParam()->RequestStation(nextChamber/2)) |
9bf6860b | 643 | bestTrackParamAtCluster.SetRemovable(kFALSE); |
644 | else bestTrackParamAtCluster.SetRemovable(kTRUE); | |
645 | trackCandidate.AddTrackParamAtCluster(bestTrackParamAtCluster,*(bestTrackParamAtCluster.GetClusterPtr())); | |
646 | ||
647 | // Printout for debuging | |
648 | if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
649 | cout << "FollowLinearTrackInChamber: added the best cluster in chamber(1..): " << bestTrackParamAtCluster.GetClusterPtr()->GetChamberId()+1 << endl; | |
650 | if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump(); | |
651 | } | |
652 | ||
653 | } else return kFALSE; | |
654 | ||
655 | } else if (foundOneCluster) { | |
656 | ||
657 | // remove obsolete track | |
658 | fRecTracksPtr->Remove(&trackCandidate); | |
659 | fNRecTracks--; | |
660 | ||
661 | } else return kFALSE; | |
662 | ||
663 | return kTRUE; | |
664 | ||
665 | } | |
666 | ||
667 | //__________________________________________________________________________ | |
96ebe67e | 668 | Bool_t AliMUONVTrackReconstructor::FollowLinearTrackInStation(AliMUONTrack &trackCandidate, const AliMUONVClusterStore& clusterStore, |
669 | Int_t nextStation) | |
019df241 | 670 | { |
96ebe67e | 671 | /// Follow trackCandidate in station(0..) nextStation assuming linear propagation, and search for compatible cluster(s) |
019df241 | 672 | /// Keep all possibilities or only the best one(s) according to the flag fgkTrackAllTracks: |
673 | /// kTRUE: duplicate "trackCandidate" if there are several possibilities and add the new tracks at the end of | |
674 | /// fRecTracksPtr to avoid conficts with other track candidates at this current stage of the tracking procedure. | |
675 | /// Remove the obsolete "trackCandidate" at the end. | |
96ebe67e | 676 | /// kFALSE: add only the best cluster(s) to the "trackCandidate". Try to add a couple of clusters in priority. |
677 | /// return kTRUE if new cluster(s) have been found (otherwise return kFALSE) | |
019df241 | 678 | AliDebug(1,Form("Enter FollowLinearTrackInStation(1..) %d", nextStation+1)); |
679 | ||
680 | // Order the chamber according to the propagation direction (tracking starts with chamber 2): | |
681 | // - nextStation == station(1...) 5 => forward propagation | |
682 | // - nextStation < station(1...) 5 => backward propagation | |
683 | Int_t ch1, ch2; | |
684 | if (nextStation==4) { | |
685 | ch1 = 2*nextStation+1; | |
686 | ch2 = 2*nextStation; | |
ea94c18b | 687 | } else { |
019df241 | 688 | ch1 = 2*nextStation; |
689 | ch2 = 2*nextStation+1; | |
ea94c18b | 690 | } |
691 | ||
96ebe67e | 692 | Double_t chi2WithOneCluster = 1.e10; |
693 | Double_t chi2WithTwoClusters = 1.e10; | |
a0dc65b4 | 694 | Double_t maxChi2WithOneCluster = 2. * GetRecoParam()->GetSigmaCutForTracking() * |
695 | GetRecoParam()->GetSigmaCutForTracking(); // 2 because 2 quantities in chi2 | |
696 | Double_t maxChi2WithTwoClusters = 4. * GetRecoParam()->GetSigmaCutForTracking() * | |
697 | GetRecoParam()->GetSigmaCutForTracking(); // 4 because 4 quantities in chi2 | |
96ebe67e | 698 | Double_t bestChi2WithOneCluster = maxChi2WithOneCluster; |
699 | Double_t bestChi2WithTwoClusters = maxChi2WithTwoClusters; | |
700 | Bool_t foundOneCluster = kFALSE; | |
701 | Bool_t foundTwoClusters = kFALSE; | |
019df241 | 702 | AliMUONTrack *newTrack = 0x0; |
96ebe67e | 703 | AliMUONVCluster *clusterCh1, *clusterCh2; |
7332f213 | 704 | AliMUONTrackParam trackParam; |
96ebe67e | 705 | AliMUONTrackParam extrapTrackParamAtCluster1; |
706 | AliMUONTrackParam extrapTrackParamAtCluster2; | |
707 | AliMUONTrackParam bestTrackParamAtCluster1; | |
708 | AliMUONTrackParam bestTrackParamAtCluster2; | |
709 | ||
710 | Int_t nClusters = clusterStore.GetSize(); | |
711 | Bool_t *clusterCh1Used = new Bool_t[nClusters]; | |
712 | for (Int_t i = 0; i < nClusters; i++) clusterCh1Used[i] = kFALSE; | |
713 | Int_t iCluster1; | |
019df241 | 714 | |
7332f213 | 715 | // Get track parameters according to the propagation direction |
716 | if (nextStation==4) trackParam = *(AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->Last(); | |
717 | else trackParam = *(AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->First(); | |
019df241 | 718 | |
9bf6860b | 719 | // Printout for debuging |
720 | if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 2) || (AliLog::GetGlobalDebugLevel() >= 2)) { | |
721 | cout<<endl<<"Track parameters and covariances at first cluster:"<<endl; | |
722 | trackParam.GetParameters().Print(); | |
723 | trackParam.GetCovariances().Print(); | |
724 | } | |
725 | ||
019df241 | 726 | // Add MCS effect |
727 | AliMUONTrackExtrap::AddMCSEffect(&trackParam,AliMUONConstants::ChamberThicknessInX0(),1.); | |
728 | ||
729 | // Printout for debuging | |
730 | if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
96ebe67e | 731 | cout << "FollowLinearTrackInStation: look for clusters in chamber(1..): " << ch2+1 << endl; |
019df241 | 732 | } |
733 | ||
96ebe67e | 734 | // Create iterators to loop over clusters in both chambers |
735 | TIter nextInCh1(clusterStore.CreateChamberIterator(ch1,ch1)); | |
736 | TIter nextInCh2(clusterStore.CreateChamberIterator(ch2,ch2)); | |
737 | ||
738 | // look for candidates in chamber 2 | |
739 | while ( ( clusterCh2 = static_cast<AliMUONVCluster*>(nextInCh2()) ) ) { | |
019df241 | 740 | |
96ebe67e | 741 | // try to add the current cluster fast |
742 | if (!TryOneClusterFast(trackParam, clusterCh2)) continue; | |
019df241 | 743 | |
96ebe67e | 744 | // try to add the current cluster accuratly |
745 | extrapTrackParamAtCluster2 = trackParam; | |
746 | AliMUONTrackExtrap::LinearExtrapToZ(&extrapTrackParamAtCluster2, clusterCh2->GetZ()); | |
747 | chi2WithOneCluster = TryOneCluster(extrapTrackParamAtCluster2, clusterCh2, extrapTrackParamAtCluster2); | |
019df241 | 748 | |
96ebe67e | 749 | // if good chi2 then try to attach a cluster in the other chamber too |
750 | if (chi2WithOneCluster < maxChi2WithOneCluster) { | |
751 | Bool_t foundSecondCluster = kFALSE; | |
019df241 | 752 | |
753 | // Printout for debuging | |
754 | if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
96ebe67e | 755 | cout << "FollowLinearTrackInStation: found one cluster in chamber(1..): " << ch2+1 |
756 | << " (Chi2 = " << chi2WithOneCluster << ")" << endl; | |
9bf6860b | 757 | clusterCh2->Print(); |
96ebe67e | 758 | cout << " look for second clusters in chamber(1..): " << ch1+1 << " ..." << endl; |
019df241 | 759 | } |
760 | ||
761 | // add MCS effect | |
96ebe67e | 762 | AliMUONTrackExtrap::AddMCSEffect(&extrapTrackParamAtCluster2,AliMUONConstants::ChamberThicknessInX0(),1.); |
019df241 | 763 | |
96ebe67e | 764 | // reset cluster iterator of chamber 1 |
765 | nextInCh1.Reset(); | |
766 | iCluster1 = -1; | |
767 | ||
768 | // look for second candidates in chamber 1 | |
769 | while ( ( clusterCh1 = static_cast<AliMUONVCluster*>(nextInCh1()) ) ) { | |
770 | iCluster1++; | |
019df241 | 771 | |
96ebe67e | 772 | // try to add the current cluster fast |
773 | if (!TryOneClusterFast(extrapTrackParamAtCluster2, clusterCh1)) continue; | |
019df241 | 774 | |
96ebe67e | 775 | // try to add the current cluster in addition to the one found in the previous chamber |
776 | chi2WithTwoClusters = TryTwoClustersFast(extrapTrackParamAtCluster2, clusterCh1, extrapTrackParamAtCluster1); | |
019df241 | 777 | |
96ebe67e | 778 | // if good chi2 then consider to add the 2 clusters to the "trackCandidate" |
779 | if (chi2WithTwoClusters < maxChi2WithTwoClusters) { | |
780 | foundSecondCluster = kTRUE; | |
781 | foundTwoClusters = kTRUE; | |
019df241 | 782 | |
783 | // Printout for debuging | |
784 | if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
96ebe67e | 785 | cout << "FollowLinearTrackInStation: found one cluster in chamber(1..): " << ch1+1 |
9bf6860b | 786 | << " (Chi2 = " << chi2WithTwoClusters << ")" << endl; |
787 | clusterCh1->Print(); | |
019df241 | 788 | } |
789 | ||
a0dc65b4 | 790 | if (GetRecoParam()->TrackAllTracks()) { |
96ebe67e | 791 | // copy trackCandidate into a new track put at the end of fRecTracksPtr and add the new clusters |
019df241 | 792 | newTrack = new ((*fRecTracksPtr)[fRecTracksPtr->GetLast()+1]) AliMUONTrack(trackCandidate); |
96ebe67e | 793 | extrapTrackParamAtCluster1.SetRemovable(kTRUE); |
794 | newTrack->AddTrackParamAtCluster(extrapTrackParamAtCluster1,*clusterCh1); | |
795 | extrapTrackParamAtCluster2.SetRemovable(kTRUE); | |
796 | newTrack->AddTrackParamAtCluster(extrapTrackParamAtCluster2,*clusterCh2); | |
019df241 | 797 | fNRecTracks++; |
798 | ||
96ebe67e | 799 | // Tag clusterCh1 as used |
800 | clusterCh1Used[iCluster1] = kTRUE; | |
019df241 | 801 | |
802 | // Printout for debuging | |
803 | if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
96ebe67e | 804 | cout << "FollowLinearTrackInStation: added two clusters in station(1..): " << nextStation+1 << endl; |
019df241 | 805 | if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump(); |
806 | } | |
807 | ||
96ebe67e | 808 | } else if (chi2WithTwoClusters < bestChi2WithTwoClusters) { |
809 | // keep track of the best couple of clusters | |
810 | bestChi2WithTwoClusters = chi2WithTwoClusters; | |
811 | bestTrackParamAtCluster1 = extrapTrackParamAtCluster1; | |
812 | bestTrackParamAtCluster2 = extrapTrackParamAtCluster2; | |
019df241 | 813 | } |
814 | ||
815 | } | |
816 | ||
817 | } | |
818 | ||
96ebe67e | 819 | // if no cluster found in chamber1 then consider to add clusterCh2 only |
820 | if (!foundSecondCluster) { | |
821 | foundOneCluster = kTRUE; | |
019df241 | 822 | |
a0dc65b4 | 823 | if (GetRecoParam()->TrackAllTracks()) { |
96ebe67e | 824 | // copy trackCandidate into a new track put at the end of fRecTracksPtr and add the new cluster |
019df241 | 825 | newTrack = new ((*fRecTracksPtr)[fRecTracksPtr->GetLast()+1]) AliMUONTrack(trackCandidate); |
a0dc65b4 | 826 | if (GetRecoParam()->RequestStation(nextStation)) |
9bf6860b | 827 | extrapTrackParamAtCluster2.SetRemovable(kFALSE); |
828 | else extrapTrackParamAtCluster2.SetRemovable(kTRUE); | |
96ebe67e | 829 | newTrack->AddTrackParamAtCluster(extrapTrackParamAtCluster2,*clusterCh2); |
019df241 | 830 | fNRecTracks++; |
831 | ||
832 | // Printout for debuging | |
833 | if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
96ebe67e | 834 | cout << "FollowLinearTrackInStation: added one cluster in chamber(1..): " << ch2+1 << endl; |
019df241 | 835 | if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump(); |
836 | } | |
837 | ||
96ebe67e | 838 | } else if (!foundTwoClusters && chi2WithOneCluster < bestChi2WithOneCluster) { |
839 | // keep track of the best cluster except if a couple of clusters has already been found | |
840 | bestChi2WithOneCluster = chi2WithOneCluster; | |
841 | bestTrackParamAtCluster1 = extrapTrackParamAtCluster2; | |
019df241 | 842 | } |
843 | ||
844 | } | |
845 | ||
846 | } | |
847 | ||
848 | } | |
849 | ||
850 | // look for candidates in chamber 1 not already attached to a track | |
96ebe67e | 851 | // if we want to keep all possible tracks or if no good couple of clusters has been found |
a0dc65b4 | 852 | if (GetRecoParam()->TrackAllTracks() || !foundTwoClusters) { |
019df241 | 853 | |
854 | // Printout for debuging | |
855 | if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
96ebe67e | 856 | cout << "FollowLinearTrackInStation: look for single cluster in chamber(1..): " << ch1+1 << endl; |
019df241 | 857 | } |
858 | ||
859 | //Extrapolate trackCandidate to chamber "ch2" | |
860 | AliMUONTrackExtrap::LinearExtrapToZ(&trackParam, AliMUONConstants::DefaultChamberZ(ch2)); | |
861 | ||
862 | // add MCS effect for next step | |
863 | AliMUONTrackExtrap::AddMCSEffect(&trackParam,AliMUONConstants::ChamberThicknessInX0(),1.); | |
9bf6860b | 864 | |
96ebe67e | 865 | // reset cluster iterator of chamber 1 |
866 | nextInCh1.Reset(); | |
867 | iCluster1 = -1; | |
868 | ||
869 | // look for second candidates in chamber 1 | |
870 | while ( ( clusterCh1 = static_cast<AliMUONVCluster*>(nextInCh1()) ) ) { | |
871 | iCluster1++; | |
019df241 | 872 | |
96ebe67e | 873 | if (clusterCh1Used[iCluster1]) continue; // Skip clusters already used |
019df241 | 874 | |
96ebe67e | 875 | // try to add the current cluster fast |
876 | if (!TryOneClusterFast(trackParam, clusterCh1)) continue; | |
9bf6860b | 877 | |
96ebe67e | 878 | // try to add the current cluster accuratly |
879 | extrapTrackParamAtCluster1 = trackParam; | |
880 | AliMUONTrackExtrap::LinearExtrapToZ(&extrapTrackParamAtCluster1, clusterCh1->GetZ()); | |
881 | chi2WithOneCluster = TryOneCluster(extrapTrackParamAtCluster1, clusterCh1, extrapTrackParamAtCluster1); | |
9bf6860b | 882 | |
96ebe67e | 883 | // if good chi2 then consider to add clusterCh1 |
884 | // We do not try to attach a cluster in the other chamber too since it has already been done above | |
885 | if (chi2WithOneCluster < maxChi2WithOneCluster) { | |
886 | foundOneCluster = kTRUE; | |
019df241 | 887 | |
888 | // Printout for debuging | |
889 | if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
96ebe67e | 890 | cout << "FollowLinearTrackInStation: found one cluster in chamber(1..): " << ch1+1 |
891 | << " (Chi2 = " << chi2WithOneCluster << ")" << endl; | |
9bf6860b | 892 | clusterCh1->Print(); |
019df241 | 893 | } |
894 | ||
a0dc65b4 | 895 | if (GetRecoParam()->TrackAllTracks()) { |
96ebe67e | 896 | // copy trackCandidate into a new track put at the end of fRecTracksPtr and add the new cluster |
019df241 | 897 | newTrack = new ((*fRecTracksPtr)[fRecTracksPtr->GetLast()+1]) AliMUONTrack(trackCandidate); |
a0dc65b4 | 898 | if (GetRecoParam()->RequestStation(nextStation)) |
9bf6860b | 899 | extrapTrackParamAtCluster1.SetRemovable(kFALSE); |
900 | else extrapTrackParamAtCluster1.SetRemovable(kTRUE); | |
96ebe67e | 901 | newTrack->AddTrackParamAtCluster(extrapTrackParamAtCluster1,*clusterCh1); |
019df241 | 902 | fNRecTracks++; |
903 | ||
904 | // Printout for debuging | |
905 | if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
96ebe67e | 906 | cout << "FollowLinearTrackInStation: added one cluster in chamber(1..): " << ch1+1 << endl; |
019df241 | 907 | if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump(); |
908 | } | |
909 | ||
96ebe67e | 910 | } else if (chi2WithOneCluster < bestChi2WithOneCluster) { |
911 | // keep track of the best cluster except if a couple of clusters has already been found | |
912 | bestChi2WithOneCluster = chi2WithOneCluster; | |
913 | bestTrackParamAtCluster1 = extrapTrackParamAtCluster1; | |
019df241 | 914 | } |
915 | ||
916 | } | |
917 | ||
918 | } | |
919 | ||
920 | } | |
921 | ||
922 | // fill out the best track if required else clean up the fRecTracksPtr array | |
a0dc65b4 | 923 | if (!GetRecoParam()->TrackAllTracks()) { |
96ebe67e | 924 | if (foundTwoClusters) { |
925 | bestTrackParamAtCluster1.SetRemovable(kTRUE); | |
926 | trackCandidate.AddTrackParamAtCluster(bestTrackParamAtCluster1,*(bestTrackParamAtCluster1.GetClusterPtr())); | |
927 | bestTrackParamAtCluster2.SetRemovable(kTRUE); | |
928 | trackCandidate.AddTrackParamAtCluster(bestTrackParamAtCluster2,*(bestTrackParamAtCluster2.GetClusterPtr())); | |
019df241 | 929 | |
930 | // Printout for debuging | |
931 | if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
96ebe67e | 932 | cout << "FollowLinearTrackInStation: added the two best clusters in station(1..): " << nextStation+1 << endl; |
019df241 | 933 | if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump(); |
934 | } | |
935 | ||
96ebe67e | 936 | } else if (foundOneCluster) { |
a0dc65b4 | 937 | if (GetRecoParam()->RequestStation(nextStation)) |
9bf6860b | 938 | bestTrackParamAtCluster1.SetRemovable(kFALSE); |
939 | else bestTrackParamAtCluster1.SetRemovable(kTRUE); | |
96ebe67e | 940 | trackCandidate.AddTrackParamAtCluster(bestTrackParamAtCluster1,*(bestTrackParamAtCluster1.GetClusterPtr())); |
019df241 | 941 | |
942 | // Printout for debuging | |
943 | if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
96ebe67e | 944 | cout << "FollowLinearTrackInStation: added the best cluster in chamber(1..): " << bestTrackParamAtCluster1.GetClusterPtr()->GetChamberId()+1 << endl; |
019df241 | 945 | if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump(); |
946 | } | |
947 | ||
dd230855 | 948 | } else { |
96ebe67e | 949 | delete [] clusterCh1Used; |
dd230855 | 950 | return kFALSE; |
951 | } | |
019df241 | 952 | |
96ebe67e | 953 | } else if (foundOneCluster || foundTwoClusters) { |
019df241 | 954 | |
955 | // remove obsolete track | |
956 | fRecTracksPtr->Remove(&trackCandidate); | |
957 | fNRecTracks--; | |
958 | ||
dd230855 | 959 | } else { |
96ebe67e | 960 | delete [] clusterCh1Used; |
dd230855 | 961 | return kFALSE; |
962 | } | |
ea94c18b | 963 | |
96ebe67e | 964 | delete [] clusterCh1Used; |
019df241 | 965 | return kTRUE; |
ea94c18b | 966 | |
967 | } | |
968 | ||
7332f213 | 969 | //__________________________________________________________________________ |
970 | void AliMUONVTrackReconstructor::ImproveTracks() | |
971 | { | |
972 | /// Improve tracks by removing clusters with local chi2 highter than the defined cut | |
973 | /// Recompute track parameters and covariances at the remaining clusters | |
974 | AliDebug(1,"Enter ImproveTracks"); | |
975 | ||
976 | AliMUONTrack *track, *nextTrack; | |
977 | ||
7332f213 | 978 | track = (AliMUONTrack*) fRecTracksPtr->First(); |
979 | while (track) { | |
980 | ||
981 | // prepare next track in case the actual track is suppressed | |
982 | nextTrack = (AliMUONTrack*) fRecTracksPtr->After(track); | |
983 | ||
984 | ImproveTrack(*track); | |
985 | ||
986 | // remove track if improvement failed | |
987 | if (!track->IsImproved()) { | |
988 | fRecTracksPtr->Remove(track); | |
989 | fNRecTracks--; | |
990 | } | |
991 | ||
992 | track = nextTrack; | |
993 | } | |
994 | ||
995 | // compress the array in case of some tracks have been removed | |
996 | fRecTracksPtr->Compress(); | |
997 | ||
998 | } | |
999 | ||
1000 | //__________________________________________________________________________ | |
1001 | void AliMUONVTrackReconstructor::Finalize() | |
1002 | { | |
1003 | /// Recompute track parameters and covariances at each attached cluster from those at the first one | |
2e2d0c44 | 1004 | /// Set the label pointing to the corresponding MC track |
7332f213 | 1005 | |
1006 | AliMUONTrack *track; | |
1007 | ||
1008 | track = (AliMUONTrack*) fRecTracksPtr->First(); | |
1009 | while (track) { | |
1010 | ||
1011 | FinalizeTrack(*track); | |
1012 | ||
2e2d0c44 | 1013 | track->FindMCLabel(); |
1014 | ||
7332f213 | 1015 | track = (AliMUONTrack*) fRecTracksPtr->After(track); |
1016 | ||
1017 | } | |
1018 | ||
1019 | } | |
1020 | ||
1021 | //__________________________________________________________________________ | |
7ec3b9cf | 1022 | void AliMUONVTrackReconstructor::ValidateTracksWithTrigger(AliMUONVTrackStore& trackStore, |
1023 | const AliMUONVTriggerTrackStore& triggerTrackStore, | |
1024 | const AliMUONVTriggerStore& triggerStore, | |
1025 | const AliMUONTrackHitPattern& trackHitPattern) | |
8d0843c6 | 1026 | { |
1027 | /// Try to match track from tracking system with trigger track | |
b709ac13 | 1028 | AliCodeTimerAuto(""); |
fda59e58 | 1029 | |
683cb6c5 | 1030 | trackHitPattern.ExecuteValidation(trackStore, triggerTrackStore, triggerStore); |
8d0843c6 | 1031 | } |
1032 | ||
ea94c18b | 1033 | //__________________________________________________________________________ |
1034 | void AliMUONVTrackReconstructor::EventReconstructTrigger(const AliMUONTriggerCircuit& circuit, | |
1035 | const AliMUONVTriggerStore& triggerStore, | |
1036 | AliMUONVTriggerTrackStore& triggerTrackStore) | |
8d0843c6 | 1037 | { |
71a2d3aa | 1038 | /// To make the trigger tracks from Local Trigger |
7ec3b9cf | 1039 | AliDebug(1, ""); |
b709ac13 | 1040 | AliCodeTimerAuto(""); |
7ec3b9cf | 1041 | |
1042 | AliMUONGlobalTrigger* globalTrigger = triggerStore.Global(); | |
e6b25a6e | 1043 | |
7ec3b9cf | 1044 | UChar_t gloTrigPat = 0; |
e6b25a6e | 1045 | |
7ec3b9cf | 1046 | if (globalTrigger) |
1047 | { | |
1048 | gloTrigPat = globalTrigger->GetGlobalResponse(); | |
e6b25a6e | 1049 | } |
1050 | ||
7ec3b9cf | 1051 | TIter next(triggerStore.CreateIterator()); |
1052 | AliMUONLocalTrigger* locTrg(0x0); | |
8d0843c6 | 1053 | |
e6b25a6e | 1054 | Float_t z11 = AliMUONConstants::DefaultChamberZ(10); |
1055 | Float_t z21 = AliMUONConstants::DefaultChamberZ(12); | |
7cf63da6 | 1056 | |
7ec3b9cf | 1057 | AliMUONTriggerTrack triggerTrack; |
1058 | ||
1059 | while ( ( locTrg = static_cast<AliMUONLocalTrigger*>(next()) ) ) | |
1060 | { | |
d72d7b9e | 1061 | Bool_t xTrig=locTrg->IsTrigX(); |
1062 | Bool_t yTrig=locTrg->IsTrigY(); | |
7ec3b9cf | 1063 | |
32ab62c9 | 1064 | Int_t localBoardId = locTrg->LoCircuit(); |
7ec3b9cf | 1065 | |
1066 | if (xTrig && yTrig) | |
1067 | { // make Trigger Track if trigger in X and Y | |
8b0baca4 | 1068 | |
32ab62c9 | 1069 | Float_t y11 = circuit.GetY11Pos(localBoardId, locTrg->LoStripX()); |
7ec3b9cf | 1070 | // need first to convert deviation to [0-30] |
1071 | // (see AliMUONLocalTriggerBoard::LocalTrigger) | |
d72d7b9e | 1072 | Int_t deviation = locTrg->GetDeviation(); |
7ec3b9cf | 1073 | Int_t stripX21 = locTrg->LoStripX()+deviation+1; |
32ab62c9 | 1074 | Float_t y21 = circuit.GetY21Pos(localBoardId, stripX21); |
1075 | Float_t x11 = circuit.GetX11Pos(localBoardId, locTrg->LoStripY()); | |
7ec3b9cf | 1076 | |
1077 | AliDebug(1, Form(" MakeTriggerTrack %d %d %d %d %f %f %f \n",locTrg->LoCircuit(), | |
1078 | locTrg->LoStripX(),locTrg->LoStripX()+locTrg->LoDev()+1,locTrg->LoStripY(),y11, y21, x11)); | |
1079 | ||
1080 | Float_t thetax = TMath::ATan2( x11 , z11 ); | |
1081 | Float_t thetay = TMath::ATan2( (y21-y11) , (z21-z11) ); | |
1082 | ||
1083 | triggerTrack.SetX11(x11); | |
1084 | triggerTrack.SetY11(y11); | |
1085 | triggerTrack.SetThetax(thetax); | |
1086 | triggerTrack.SetThetay(thetay); | |
1087 | triggerTrack.SetGTPattern(gloTrigPat); | |
32ab62c9 | 1088 | triggerTrack.SetLoTrgNum(localBoardId); |
7ec3b9cf | 1089 | |
1090 | triggerTrackStore.Add(triggerTrack); | |
1091 | } // board is fired | |
e6b25a6e | 1092 | } // end of loop on Local Trigger |
8d0843c6 | 1093 | } |
ea94c18b | 1094 |