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a9e2aefa | 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 | ||
cc87ebcd | 16 | /* $Id$ */ |
17 | ||
3d1463c8 | 18 | //----------------------------------------------------------------------------- |
7945aae7 | 19 | /// \class AliMUONTrackReconstructor |
20 | /// MUON track reconstructor using the original method | |
21 | /// | |
22 | /// This class contains as data: | |
23 | /// - the parameters for the track reconstruction | |
24 | /// | |
25 | /// It contains as methods, among others: | |
26 | /// - MakeTracks to build the tracks | |
3d1463c8 | 27 | //----------------------------------------------------------------------------- |
a9e2aefa | 28 | |
29f1b13a | 29 | #include "AliMUONTrackReconstructor.h" |
7ec3b9cf | 30 | |
29fc2c86 | 31 | #include "AliMUONConstants.h" |
96ebe67e | 32 | #include "AliMUONVCluster.h" |
1fef78c8 | 33 | #include "AliMUONVClusterServer.h" |
96ebe67e | 34 | #include "AliMUONVClusterStore.h" |
a9e2aefa | 35 | #include "AliMUONTrack.h" |
37827b29 | 36 | #include "AliMUONTrackParam.h" |
37 | #include "AliMUONTrackExtrap.h" | |
5a240757 | 38 | #include "AliMUONRecoParam.h" |
b709ac13 | 39 | |
1fef78c8 | 40 | #include "AliMpArea.h" |
41 | ||
8c343c7c | 42 | #include "AliLog.h" |
af743f54 | 43 | |
208f139e | 44 | #include <TMinuit.h> |
af743f54 | 45 | #include <Riostream.h> |
ea94c18b | 46 | #include <TMath.h> |
af743f54 | 47 | #include <TMatrixD.h> |
a9e2aefa | 48 | |
de2cd600 | 49 | // Functions to be minimized with Minuit |
ea94c18b | 50 | void TrackChi2(Int_t &nParam, Double_t *gradient, Double_t &chi2, Double_t *param, Int_t flag); |
de2cd600 | 51 | |
7945aae7 | 52 | /// \cond CLASSIMP |
29f1b13a | 53 | ClassImp(AliMUONTrackReconstructor) // Class implementation in ROOT context |
7945aae7 | 54 | /// \endcond |
a9e2aefa | 55 | |
019df241 | 56 | //__________________________________________________________________________ |
a0dc65b4 | 57 | AliMUONTrackReconstructor::AliMUONTrackReconstructor(const AliMUONRecoParam* recoParam, AliMUONVClusterServer* clusterServer) |
58 | : AliMUONVTrackReconstructor(recoParam,clusterServer) | |
a9e2aefa | 59 | { |
96ebe67e | 60 | /// Constructor |
a9e2aefa | 61 | } |
9cbdf048 | 62 | |
019df241 | 63 | //__________________________________________________________________________ |
ea94c18b | 64 | AliMUONTrackReconstructor::~AliMUONTrackReconstructor() |
a9e2aefa | 65 | { |
ea94c18b | 66 | /// Destructor |
67 | } | |
276c44b7 | 68 | |
de2cd600 | 69 | //__________________________________________________________________________ |
89c8d66d | 70 | Bool_t AliMUONTrackReconstructor::MakeTrackCandidates(AliMUONVClusterStore& clusterStore) |
de2cd600 | 71 | { |
019df241 | 72 | /// To make track candidates (assuming linear propagation if the flag fgkMakeTrackCandidatesFast is set to kTRUE): |
208f139e | 73 | /// Start with segments station(1..) 4 or 5 then follow track in station 5 or 4. |
96ebe67e | 74 | /// Good candidates are made of at least three clusters. |
208f139e | 75 | /// Keep only best candidates or all of them according to the flag fgkTrackAllTracks. |
b709ac13 | 76 | |
208f139e | 77 | TClonesArray *segments; |
208f139e | 78 | AliMUONTrack *track; |
208f139e | 79 | Int_t iCandidate = 0; |
96ebe67e | 80 | Bool_t clusterFound; |
208f139e | 81 | |
de2cd600 | 82 | AliDebug(1,"Enter MakeTrackCandidates"); |
de2cd600 | 83 | |
3a7acd03 | 84 | // Unless we're doing combined tracking, we'll clusterize all stations at once |
85 | Int_t firstChamber(0); | |
86 | Int_t lastChamber(9); | |
87 | ||
a0dc65b4 | 88 | if (GetRecoParam()->CombineClusterTrackReco()) { |
3a7acd03 | 89 | // ... Here's the exception : ask the clustering to reconstruct |
90 | // clusters *only* in station 4 and 5 for combined tracking | |
91 | firstChamber = 6; | |
92 | } | |
93 | ||
94 | for (Int_t i = firstChamber; i <= lastChamber; ++i ) | |
95 | { | |
35be7ed7 | 96 | if (fClusterServer && GetRecoParam()->UseChamber(i)) fClusterServer->Clusterize(i, clusterStore, AliMpArea(), GetRecoParam()); |
1fef78c8 | 97 | } |
98 | ||
208f139e | 99 | // Loop over stations(1..) 5 and 4 and make track candidates |
ea94c18b | 100 | for (Int_t istat=4; istat>=3; istat--) { |
101 | ||
208f139e | 102 | // Make segments in the station |
9bf6860b | 103 | segments = MakeSegmentsBetweenChambers(clusterStore, 2*istat, 2*istat+1); |
ea94c18b | 104 | |
208f139e | 105 | // Loop over segments |
7ec3b9cf | 106 | for (Int_t iseg=0; iseg<segments->GetEntriesFast(); iseg++) |
107 | { | |
208f139e | 108 | AliDebug(1,Form("Making primary candidate(1..) %d",++iCandidate)); |
ea94c18b | 109 | |
208f139e | 110 | // Transform segments to tracks and put them at the end of fRecTracksPtr |
a0dc65b4 | 111 | track = new ((*fRecTracksPtr)[fRecTracksPtr->GetLast()+1]) AliMUONTrack((AliMUONObjectPair*)((*segments)[iseg]),GetRecoParam()->GetBendingVertexDispersion()); |
a9e2aefa | 112 | fNRecTracks++; |
ea94c18b | 113 | |
96ebe67e | 114 | // Look for compatible cluster(s) in the other station |
a0dc65b4 | 115 | if (GetRecoParam()->MakeTrackCandidatesFast()) |
96ebe67e | 116 | clusterFound = FollowLinearTrackInStation(*track, clusterStore, 7-istat); |
117 | else clusterFound = FollowTrackInStation(*track, clusterStore, 7-istat); | |
019df241 | 118 | |
89c8d66d | 119 | // Remove track if no cluster found on a requested station |
120 | // or abort tracking if there are too many candidates | |
6b191dea | 121 | if (GetRecoParam()->RequestStation(7-istat)) { |
122 | if (!clusterFound) { | |
123 | fRecTracksPtr->Remove(track); | |
124 | fNRecTracks--; | |
125 | } else if (fNRecTracks > GetRecoParam()->GetMaxTrackCandidates()) { | |
4ea3f013 | 126 | AliError(Form("Too many track candidates (%d tracks). Stop tracking.", fNRecTracks)); |
6b191dea | 127 | delete segments; |
128 | return kFALSE; | |
129 | } | |
130 | } else { | |
131 | if ((fNRecTracks + segments->GetEntriesFast() - iseg - 1) > GetRecoParam()->GetMaxTrackCandidates()) { | |
4ea3f013 | 132 | AliError(Form("Too many track candidates (%d tracks). Stop tracking.", fNRecTracks + segments->GetEntriesFast() - iseg - 1)); |
6b191dea | 133 | delete segments; |
134 | return kFALSE; | |
135 | } | |
ea94c18b | 136 | } |
137 | ||
a9e2aefa | 138 | } |
ea94c18b | 139 | |
208f139e | 140 | // delete the array of segments |
141 | delete segments; | |
142 | } | |
ea94c18b | 143 | |
208f139e | 144 | // Keep all different tracks or only the best ones as required |
a0dc65b4 | 145 | if (GetRecoParam()->TrackAllTracks()) RemoveIdenticalTracks(); |
208f139e | 146 | else RemoveDoubleTracks(); |
147 | ||
148 | AliDebug(1,Form("Number of good candidates = %d",fNRecTracks)); | |
149 | ||
89c8d66d | 150 | return kTRUE; |
151 | ||
9bf6860b | 152 | } |
153 | ||
154 | //__________________________________________________________________________ | |
89c8d66d | 155 | Bool_t AliMUONTrackReconstructor::MakeMoreTrackCandidates(AliMUONVClusterStore& clusterStore) |
9bf6860b | 156 | { |
157 | /// To make extra track candidates (assuming linear propagation if the flag fgkMakeTrackCandidatesFast is set to kTRUE): | |
158 | /// clustering is supposed to be already done | |
159 | /// Start with segments made of 1 cluster in each of the stations 4 and 5 then follow track in remaining chambers. | |
160 | /// Good candidates are made of at least three clusters if both station are requested (two otherwise). | |
161 | /// Keep only best candidates or all of them according to the flag fgkTrackAllTracks. | |
162 | ||
163 | TClonesArray *segments; | |
89c8d66d | 164 | AliMUONObjectPair *segment; |
9bf6860b | 165 | AliMUONTrack *track; |
166 | Int_t iCandidate = 0, iCurrentTrack, nCurrentTracks; | |
167 | Bool_t clusterFound; | |
168 | ||
169 | AliDebug(1,"Enter MakeMoreTrackCandidates"); | |
170 | ||
171 | // Double loop over chambers in stations(1..) 4 and 5 to make track candidates | |
172 | for (Int_t ich1 = 6; ich1 <= 7; ich1++) { | |
173 | for (Int_t ich2 = 8; ich2 <= 9; ich2++) { | |
174 | ||
175 | // Make segments in the station | |
176 | segments = MakeSegmentsBetweenChambers(clusterStore, ich1, ich2); | |
177 | ||
89c8d66d | 178 | /// Remove segments already attached to a track |
179 | RemoveUsedSegments(*segments); | |
180 | ||
9bf6860b | 181 | // Loop over segments |
89c8d66d | 182 | for (Int_t iSegment=0; iSegment<segments->GetEntriesFast(); iSegment++) |
9bf6860b | 183 | { |
184 | AliDebug(1,Form("Making primary candidate(1..) %d",++iCandidate)); | |
89c8d66d | 185 | segment = (AliMUONObjectPair*) segments->UncheckedAt(iSegment); |
9bf6860b | 186 | |
187 | // Transform segments to tracks and put them at the end of fRecTracksPtr | |
188 | iCurrentTrack = fRecTracksPtr->GetLast()+1; | |
89c8d66d | 189 | track = new ((*fRecTracksPtr)[iCurrentTrack]) AliMUONTrack(segment,GetRecoParam()->GetBendingVertexDispersion()); |
9bf6860b | 190 | fNRecTracks++; |
191 | ||
192 | // Look for compatible cluster(s) in the second chamber of station 5 | |
89c8d66d | 193 | clusterFound = FollowLinearTrackInChamber(*track, clusterStore, 17-ich2); |
9bf6860b | 194 | |
195 | // skip the original track in case it has been removed | |
a0dc65b4 | 196 | if (GetRecoParam()->TrackAllTracks() && clusterFound) iCurrentTrack++; |
9bf6860b | 197 | |
198 | // loop over every new tracks | |
199 | nCurrentTracks = fRecTracksPtr->GetLast()+1; | |
200 | while (iCurrentTrack < nCurrentTracks) { | |
201 | track = (AliMUONTrack*) fRecTracksPtr->UncheckedAt(iCurrentTrack); | |
202 | ||
203 | // Look for compatible cluster(s) in the second chamber of station 4 | |
89c8d66d | 204 | FollowLinearTrackInChamber(*track, clusterStore, 13-ich1); |
9bf6860b | 205 | |
206 | iCurrentTrack++; | |
207 | } | |
208 | ||
89c8d66d | 209 | // abort tracking if there are too many candidates |
6b191dea | 210 | if ((fNRecTracks + segments->GetEntriesFast() - iSegment - 1) > GetRecoParam()->GetMaxTrackCandidates()) { |
4ea3f013 | 211 | AliError(Form("Too many track candidates (%d tracks). Stop tracking.", fNRecTracks + segments->GetEntriesFast() - iSegment - 1)); |
89c8d66d | 212 | delete segments; |
213 | return kFALSE; | |
214 | } | |
215 | ||
9bf6860b | 216 | } |
217 | ||
218 | // delete the array of segments | |
219 | delete segments; | |
220 | } | |
221 | } | |
222 | ||
89c8d66d | 223 | // Keep only the best tracks if required |
224 | if (!GetRecoParam()->TrackAllTracks()) RemoveDoubleTracks(); | |
225 | else fRecTracksPtr->Compress(); | |
9bf6860b | 226 | |
227 | AliDebug(1,Form("Number of good candidates = %d",fNRecTracks)); | |
228 | ||
89c8d66d | 229 | return kTRUE; |
230 | ||
a9e2aefa | 231 | } |
232 | ||
233 | //__________________________________________________________________________ | |
89c8d66d | 234 | Bool_t AliMUONTrackReconstructor::FollowTracks(AliMUONVClusterStore& clusterStore) |
a9e2aefa | 235 | { |
2457f726 | 236 | /// Follow tracks in stations(1..) 3, 2 and 1 |
208f139e | 237 | AliDebug(1,"Enter FollowTracks"); |
238 | ||
04b5ea16 | 239 | AliMUONTrack *track, *nextTrack; |
b709ac13 | 240 | AliMUONTrackParam *trackParam, *nextTrackParam; |
af743f54 | 241 | Int_t currentNRecTracks; |
208f139e | 242 | |
a0dc65b4 | 243 | Double_t sigmaCut2 = GetRecoParam()->GetSigmaCutForTracking() * |
244 | GetRecoParam()->GetSigmaCutForTracking(); | |
3304fa09 | 245 | |
208f139e | 246 | for (Int_t station = 2; station >= 0; station--) { |
ea94c18b | 247 | |
208f139e | 248 | // Save the actual number of reconstructed track in case of |
249 | // tracks are added or suppressed during the tracking procedure | |
250 | // !! Do not compress fRecTracksPtr until the end of the loop over tracks !! | |
af743f54 | 251 | currentNRecTracks = fNRecTracks; |
ea94c18b | 252 | |
af743f54 | 253 | for (Int_t iRecTrack = 0; iRecTrack <currentNRecTracks; iRecTrack++) { |
208f139e | 254 | AliDebug(1,Form("FollowTracks: track candidate(1..) %d", iRecTrack+1)); |
ea94c18b | 255 | |
208f139e | 256 | track = (AliMUONTrack*) fRecTracksPtr->UncheckedAt(iRecTrack); |
ea94c18b | 257 | |
208f139e | 258 | // Fit the track: |
259 | // Do not take into account the multiple scattering to speed up the fit | |
260 | // Calculate the track parameter covariance matrix | |
9bf6860b | 261 | // If there is no cluster out of station 4 or 5 then use the vertex to better constrain the fit |
262 | if (((AliMUONTrackParam*) track->GetTrackParamAtCluster()->First())->GetClusterPtr()->GetChamberId() > 5) | |
263 | Fit(*track, kFALSE, kTRUE, kTRUE); | |
96ebe67e | 264 | else Fit(*track, kFALSE, kFALSE, kTRUE); |
ea94c18b | 265 | |
6b191dea | 266 | // remove tracks out of limits |
267 | if (!IsAcceptable(*((AliMUONTrackParam*)track->GetTrackParamAtCluster()->First()))) { | |
268 | fRecTracksPtr->Remove(track); | |
269 | fNRecTracks--; | |
270 | continue; | |
89c8d66d | 271 | } |
272 | ||
273 | // remove track if the normalized chi2 is too high | |
274 | if (track->GetNormalizedChi2() > sigmaCut2) { | |
9bf6860b | 275 | fRecTracksPtr->Remove(track); |
89c8d66d | 276 | fNRecTracks--; |
277 | continue; | |
208f139e | 278 | } |
ea94c18b | 279 | |
b709ac13 | 280 | // save parameters from fit into smoothed parameters to complete track afterward |
a0dc65b4 | 281 | if (GetRecoParam()->ComplementTracks()) { |
b709ac13 | 282 | |
283 | if (station==2) { // save track parameters on stations 4 and 5 | |
284 | ||
285 | // extrapolate track parameters and covariances at each cluster | |
4ea3f013 | 286 | // remove the track in case of failure |
287 | if (!track->UpdateCovTrackParamAtCluster()) { | |
288 | fRecTracksPtr->Remove(track); | |
289 | fNRecTracks--; | |
290 | continue; | |
291 | } | |
b709ac13 | 292 | |
293 | // save them | |
96ebe67e | 294 | trackParam = (AliMUONTrackParam*) track->GetTrackParamAtCluster()->First(); |
b709ac13 | 295 | while (trackParam) { |
296 | trackParam->SetSmoothParameters(trackParam->GetParameters()); | |
297 | trackParam->SetSmoothCovariances(trackParam->GetCovariances()); | |
96ebe67e | 298 | trackParam = (AliMUONTrackParam*) track->GetTrackParamAtCluster()->After(trackParam); |
b709ac13 | 299 | } |
300 | ||
301 | } else { // or save track parameters on last station only | |
302 | ||
96ebe67e | 303 | trackParam = (AliMUONTrackParam*) track->GetTrackParamAtCluster()->First(); |
9bf6860b | 304 | if (trackParam->GetClusterPtr()->GetChamberId() < 2*(station+2)) { |
b709ac13 | 305 | |
9bf6860b | 306 | // save parameters from fit |
307 | trackParam->SetSmoothParameters(trackParam->GetParameters()); | |
308 | trackParam->SetSmoothCovariances(trackParam->GetCovariances()); | |
b709ac13 | 309 | |
9bf6860b | 310 | // save parameters extrapolated to the second chamber of the same station if it has been hit |
311 | nextTrackParam = (AliMUONTrackParam*) track->GetTrackParamAtCluster()->After(trackParam); | |
312 | if (nextTrackParam->GetClusterPtr()->GetChamberId() < 2*(station+2)) { | |
313 | ||
314 | // reset parameters and covariances | |
315 | nextTrackParam->SetParameters(trackParam->GetParameters()); | |
316 | nextTrackParam->SetZ(trackParam->GetZ()); | |
317 | nextTrackParam->SetCovariances(trackParam->GetCovariances()); | |
318 | ||
319 | // extrapolate them to the z of the corresponding cluster | |
4ea3f013 | 320 | // remove the track in case of failure |
321 | if (!AliMUONTrackExtrap::ExtrapToZCov(nextTrackParam, nextTrackParam->GetClusterPtr()->GetZ())) { | |
322 | fRecTracksPtr->Remove(track); | |
323 | fNRecTracks--; | |
324 | continue; | |
325 | } | |
9bf6860b | 326 | |
327 | // save them | |
328 | nextTrackParam->SetSmoothParameters(nextTrackParam->GetParameters()); | |
329 | nextTrackParam->SetSmoothCovariances(nextTrackParam->GetCovariances()); | |
330 | ||
331 | } | |
b709ac13 | 332 | |
333 | } | |
334 | ||
335 | } | |
336 | ||
337 | } | |
338 | ||
96ebe67e | 339 | // Look for compatible cluster(s) in station(0..) "station" |
9bf6860b | 340 | if (!FollowTrackInStation(*track, clusterStore, station)) { |
341 | ||
342 | // Try to recover track if required | |
a0dc65b4 | 343 | if (GetRecoParam()->RecoverTracks()) { |
9bf6860b | 344 | |
345 | // work on a copy of the track if this station is not required | |
346 | // to keep the case where no cluster is reconstructed as a possible candidate | |
a0dc65b4 | 347 | if (!GetRecoParam()->RequestStation(station)) { |
9bf6860b | 348 | track = new ((*fRecTracksPtr)[fRecTracksPtr->GetLast()+1]) AliMUONTrack(*track); |
349 | fNRecTracks++; | |
350 | } | |
351 | ||
352 | // try to recover | |
353 | if (!RecoverTrack(*track, clusterStore, station)) { | |
354 | // remove track if no cluster found | |
355 | fRecTracksPtr->Remove(track); | |
356 | fNRecTracks--; | |
357 | } | |
358 | ||
a0dc65b4 | 359 | } else if (GetRecoParam()->RequestStation(station)) { |
9bf6860b | 360 | // remove track if no cluster found |
361 | fRecTracksPtr->Remove(track); | |
362 | fNRecTracks--; | |
363 | } | |
364 | ||
ea94c18b | 365 | } |
366 | ||
89c8d66d | 367 | // abort tracking if there are too many candidates |
368 | if (fNRecTracks > GetRecoParam()->GetMaxTrackCandidates()) { | |
4ea3f013 | 369 | AliError(Form("Too many track candidates (%d tracks). Stop tracking.", fNRecTracks)); |
89c8d66d | 370 | return kFALSE; |
371 | } | |
372 | ||
208f139e | 373 | } |
ea94c18b | 374 | |
208f139e | 375 | // Compress fRecTracksPtr for the next step |
376 | fRecTracksPtr->Compress(); | |
ea94c18b | 377 | |
208f139e | 378 | // Keep only the best tracks if required |
a0dc65b4 | 379 | if (!GetRecoParam()->TrackAllTracks()) RemoveDoubleTracks(); |
ea94c18b | 380 | |
208f139e | 381 | } |
382 | ||
96ebe67e | 383 | // Last fit of track candidates with all stations |
208f139e | 384 | // Take into account the multiple scattering and remove bad tracks |
385 | Int_t trackIndex = -1; | |
04b5ea16 | 386 | track = (AliMUONTrack*) fRecTracksPtr->First(); |
04b5ea16 | 387 | while (track) { |
ea94c18b | 388 | |
04b5ea16 | 389 | trackIndex++; |
390 | nextTrack = (AliMUONTrack*) fRecTracksPtr->After(track); // prepare next track | |
ea94c18b | 391 | |
96ebe67e | 392 | Fit(*track, kTRUE, kFALSE, kTRUE); |
ea94c18b | 393 | |
208f139e | 394 | // Printout for debuging |
395 | if (AliLog::GetGlobalDebugLevel() >= 3) { | |
396 | cout << "FollowTracks: track candidate(0..) " << trackIndex << " after final fit" << endl; | |
a9e2aefa | 397 | track->RecursiveDump(); |
208f139e | 398 | } |
ea94c18b | 399 | |
208f139e | 400 | // Remove the track if the normalized chi2 is too high |
3304fa09 | 401 | if (track->GetNormalizedChi2() > sigmaCut2) { |
208f139e | 402 | fRecTracksPtr->Remove(track); |
403 | fNRecTracks--; | |
6d9a2d45 | 404 | track = nextTrack; |
405 | continue; | |
a9e2aefa | 406 | } |
ea94c18b | 407 | |
b709ac13 | 408 | // save parameters from fit into smoothed parameters to complete track afterward |
a0dc65b4 | 409 | if (GetRecoParam()->ComplementTracks()) { |
b709ac13 | 410 | |
96ebe67e | 411 | trackParam = (AliMUONTrackParam*) track->GetTrackParamAtCluster()->First(); |
9bf6860b | 412 | if (trackParam->GetClusterPtr()->GetChamberId() < 2) { |
b709ac13 | 413 | |
9bf6860b | 414 | // save parameters from fit |
415 | trackParam->SetSmoothParameters(trackParam->GetParameters()); | |
416 | trackParam->SetSmoothCovariances(trackParam->GetCovariances()); | |
b709ac13 | 417 | |
9bf6860b | 418 | // save parameters extrapolated to the second chamber of the same station if it has been hit |
419 | nextTrackParam = (AliMUONTrackParam*) track->GetTrackParamAtCluster()->After(trackParam); | |
420 | if (nextTrackParam->GetClusterPtr()->GetChamberId() < 2) { | |
421 | ||
422 | // reset parameters and covariances | |
423 | nextTrackParam->SetParameters(trackParam->GetParameters()); | |
424 | nextTrackParam->SetZ(trackParam->GetZ()); | |
425 | nextTrackParam->SetCovariances(trackParam->GetCovariances()); | |
426 | ||
427 | // extrapolate them to the z of the corresponding cluster | |
4ea3f013 | 428 | // remove the track in case of failure |
429 | if (!AliMUONTrackExtrap::ExtrapToZCov(nextTrackParam, nextTrackParam->GetClusterPtr()->GetZ())) { | |
430 | fRecTracksPtr->Remove(track); | |
431 | fNRecTracks--; | |
432 | track = nextTrack; | |
433 | continue; | |
434 | } | |
9bf6860b | 435 | |
436 | // save them | |
437 | nextTrackParam->SetSmoothParameters(nextTrackParam->GetParameters()); | |
438 | nextTrackParam->SetSmoothCovariances(nextTrackParam->GetCovariances()); | |
439 | ||
440 | } | |
b709ac13 | 441 | |
442 | } | |
443 | ||
444 | } | |
445 | ||
208f139e | 446 | track = nextTrack; |
ea94c18b | 447 | |
208f139e | 448 | } |
ea94c18b | 449 | |
208f139e | 450 | fRecTracksPtr->Compress(); |
451 | ||
89c8d66d | 452 | return kTRUE; |
453 | ||
9bf6860b | 454 | } |
455 | ||
456 | //__________________________________________________________________________ | |
457 | Bool_t AliMUONTrackReconstructor::FollowTrackInChamber(AliMUONTrack &trackCandidate, AliMUONVClusterStore& clusterStore, Int_t nextChamber) | |
458 | { | |
459 | /// Follow trackCandidate in chamber(0..) nextChamber and search for compatible cluster(s) | |
460 | /// Keep all possibilities or only the best one(s) according to the flag fgkTrackAllTracks: | |
461 | /// kTRUE: duplicate "trackCandidate" if there are several possibilities and add the new tracks at the end of | |
462 | /// fRecTracksPtr to avoid conficts with other track candidates at this current stage of the tracking procedure. | |
463 | /// Remove the obsolete "trackCandidate" at the end. | |
464 | /// kFALSE: add only the best cluster(s) to the "trackCandidate". Try to add a couple of clusters in priority. | |
465 | AliDebug(1,Form("Enter FollowTrackInChamber(1..) %d", nextChamber+1)); | |
466 | ||
4ea3f013 | 467 | Double_t chi2WithOneCluster = AliMUONTrack::MaxChi2(); |
a0dc65b4 | 468 | Double_t maxChi2WithOneCluster = 2. * GetRecoParam()->GetSigmaCutForTracking() * |
469 | GetRecoParam()->GetSigmaCutForTracking(); // 2 because 2 quantities in chi2 | |
9bf6860b | 470 | Double_t bestChi2WithOneCluster = maxChi2WithOneCluster; |
471 | Bool_t foundOneCluster = kFALSE; | |
472 | AliMUONTrack *newTrack = 0x0; | |
473 | AliMUONVCluster *cluster; | |
474 | AliMUONTrackParam extrapTrackParam; | |
475 | AliMUONTrackParam extrapTrackParamAtCh; | |
476 | AliMUONTrackParam extrapTrackParamAtCluster; | |
477 | AliMUONTrackParam bestTrackParamAtCluster; | |
478 | ||
479 | // Get track parameters according to the propagation direction | |
480 | if (nextChamber > 7) extrapTrackParamAtCh = *(AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->Last(); | |
481 | else extrapTrackParamAtCh = *(AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->First(); | |
482 | ||
483 | // Printout for debuging | |
484 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructor") >= 2) || (AliLog::GetGlobalDebugLevel() >= 2)) { | |
485 | cout<<endl<<"Track parameters and covariances at first cluster:"<<endl; | |
486 | extrapTrackParamAtCh.GetParameters().Print(); | |
487 | extrapTrackParamAtCh.GetCovariances().Print(); | |
488 | } | |
489 | ||
490 | // Add MCS effect | |
4663da9f | 491 | Int_t currentChamber = extrapTrackParamAtCh.GetClusterPtr()->GetChamberId(); |
492 | AliMUONTrackExtrap::AddMCSEffect(&extrapTrackParamAtCh,AliMUONConstants::ChamberThicknessInX0(currentChamber),-1.); | |
9bf6860b | 493 | |
494 | // Add MCS in the missing chamber(s) if any | |
9bf6860b | 495 | while (currentChamber > nextChamber + 1) { |
496 | // extrapolation to the missing chamber | |
497 | currentChamber--; | |
4ea3f013 | 498 | if (!AliMUONTrackExtrap::ExtrapToZCov(&extrapTrackParamAtCh, AliMUONConstants::DefaultChamberZ(currentChamber))) return kFALSE; |
9bf6860b | 499 | // add MCS effect |
4663da9f | 500 | AliMUONTrackExtrap::AddMCSEffect(&extrapTrackParamAtCh,AliMUONConstants::ChamberThicknessInX0(currentChamber),-1.); |
9bf6860b | 501 | } |
502 | ||
503 | //Extrapolate trackCandidate to chamber | |
4ea3f013 | 504 | if (!AliMUONTrackExtrap::ExtrapToZCov(&extrapTrackParamAtCh, AliMUONConstants::DefaultChamberZ(nextChamber))) return kFALSE; |
9bf6860b | 505 | |
506 | // Printout for debuging | |
507 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructor") >= 2) || (AliLog::GetGlobalDebugLevel() >= 2)) { | |
508 | cout<<endl<<"Track parameters and covariances at first cluster extrapolated to z = "<<AliMUONConstants::DefaultChamberZ(nextChamber)<<":"<<endl; | |
509 | extrapTrackParamAtCh.GetParameters().Print(); | |
510 | extrapTrackParamAtCh.GetCovariances().Print(); | |
511 | } | |
512 | ||
513 | // Printout for debuging | |
514 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
515 | cout << "FollowTrackInStation: look for clusters in chamber(1..): " << nextChamber+1 << endl; | |
516 | } | |
517 | ||
518 | // Ask the clustering to reconstruct new clusters around the track position in the current chamber | |
519 | // except for station 4 and 5 that are already entirely clusterized | |
a0dc65b4 | 520 | if (GetRecoParam()->CombineClusterTrackReco()) { |
9bf6860b | 521 | if (nextChamber < 6) AskForNewClustersInChamber(extrapTrackParamAtCh, clusterStore, nextChamber); |
522 | } | |
523 | ||
524 | // Create iterators to loop over clusters in both chambers | |
525 | TIter next(clusterStore.CreateChamberIterator(nextChamber,nextChamber)); | |
526 | ||
527 | // look for cluster in chamber | |
528 | while ( ( cluster = static_cast<AliMUONVCluster*>(next()) ) ) { | |
529 | ||
530 | // try to add the current cluster fast | |
531 | if (!TryOneClusterFast(extrapTrackParamAtCh, cluster)) continue; | |
532 | ||
533 | // try to add the current cluster accuratly | |
534 | chi2WithOneCluster = TryOneCluster(extrapTrackParamAtCh, cluster, extrapTrackParamAtCluster); | |
535 | ||
536 | // if good chi2 then consider to add cluster | |
537 | if (chi2WithOneCluster < maxChi2WithOneCluster) { | |
538 | foundOneCluster = kTRUE; | |
539 | ||
540 | // Printout for debuging | |
541 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
542 | cout << "FollowTrackInStation: found one cluster in chamber(1..): " << nextChamber+1 | |
543 | << " (Chi2 = " << chi2WithOneCluster << ")" << endl; | |
544 | cluster->Print(); | |
545 | } | |
546 | ||
a0dc65b4 | 547 | if (GetRecoParam()->TrackAllTracks()) { |
9bf6860b | 548 | // copy trackCandidate into a new track put at the end of fRecTracksPtr and add the new cluster |
549 | newTrack = new ((*fRecTracksPtr)[fRecTracksPtr->GetLast()+1]) AliMUONTrack(trackCandidate); | |
550 | UpdateTrack(*newTrack,extrapTrackParamAtCluster); | |
551 | fNRecTracks++; | |
552 | ||
553 | // Printout for debuging | |
554 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
555 | cout << "FollowTrackInStation: added one cluster in chamber(1..): " << nextChamber+1 << endl; | |
556 | if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump(); | |
557 | } | |
558 | ||
559 | } else if (chi2WithOneCluster < bestChi2WithOneCluster) { | |
560 | // keep track of the best single cluster except if a couple of clusters has already been found | |
561 | bestChi2WithOneCluster = chi2WithOneCluster; | |
562 | bestTrackParamAtCluster = extrapTrackParamAtCluster; | |
563 | } | |
564 | ||
565 | } | |
566 | ||
567 | } | |
568 | ||
569 | // fill out the best track if required else clean up the fRecTracksPtr array | |
a0dc65b4 | 570 | if (!GetRecoParam()->TrackAllTracks()) { |
9bf6860b | 571 | if (foundOneCluster) { |
572 | UpdateTrack(trackCandidate,bestTrackParamAtCluster); | |
573 | ||
574 | // Printout for debuging | |
575 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
576 | cout << "FollowTrackInStation: added the best cluster in chamber(1..): " << bestTrackParamAtCluster.GetClusterPtr()->GetChamberId()+1 << endl; | |
577 | if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump(); | |
578 | } | |
579 | ||
580 | } else return kFALSE; | |
581 | ||
582 | } else if (foundOneCluster) { | |
583 | ||
584 | // remove obsolete track | |
585 | fRecTracksPtr->Remove(&trackCandidate); | |
586 | fNRecTracks--; | |
587 | ||
588 | } else return kFALSE; | |
589 | ||
590 | return kTRUE; | |
591 | ||
208f139e | 592 | } |
1a38e749 | 593 | |
208f139e | 594 | //__________________________________________________________________________ |
1fef78c8 | 595 | Bool_t AliMUONTrackReconstructor::FollowTrackInStation(AliMUONTrack &trackCandidate, AliMUONVClusterStore& clusterStore, Int_t nextStation) |
208f139e | 596 | { |
96ebe67e | 597 | /// Follow trackCandidate in station(0..) nextStation and search for compatible cluster(s) |
208f139e | 598 | /// Keep all possibilities or only the best one(s) according to the flag fgkTrackAllTracks: |
599 | /// kTRUE: duplicate "trackCandidate" if there are several possibilities and add the new tracks at the end of | |
600 | /// fRecTracksPtr to avoid conficts with other track candidates at this current stage of the tracking procedure. | |
601 | /// Remove the obsolete "trackCandidate" at the end. | |
96ebe67e | 602 | /// kFALSE: add only the best cluster(s) to the "trackCandidate". Try to add a couple of clusters in priority. |
208f139e | 603 | AliDebug(1,Form("Enter FollowTrackInStation(1..) %d", nextStation+1)); |
604 | ||
ea94c18b | 605 | // Order the chamber according to the propagation direction (tracking starts with chamber 2): |
606 | // - nextStation == station(1...) 5 => forward propagation | |
607 | // - nextStation < station(1...) 5 => backward propagation | |
608 | Int_t ch1, ch2; | |
609 | if (nextStation==4) { | |
610 | ch1 = 2*nextStation+1; | |
611 | ch2 = 2*nextStation; | |
612 | } else { | |
613 | ch1 = 2*nextStation; | |
614 | ch2 = 2*nextStation+1; | |
615 | } | |
616 | ||
4ea3f013 | 617 | Double_t chi2WithOneCluster = AliMUONTrack::MaxChi2(); |
618 | Double_t chi2WithTwoClusters = AliMUONTrack::MaxChi2(); | |
a0dc65b4 | 619 | Double_t maxChi2WithOneCluster = 2. * GetRecoParam()->GetSigmaCutForTracking() * |
620 | GetRecoParam()->GetSigmaCutForTracking(); // 2 because 2 quantities in chi2 | |
621 | Double_t maxChi2WithTwoClusters = 4. * GetRecoParam()->GetSigmaCutForTracking() * | |
622 | GetRecoParam()->GetSigmaCutForTracking(); // 4 because 4 quantities in chi2 | |
96ebe67e | 623 | Double_t bestChi2WithOneCluster = maxChi2WithOneCluster; |
624 | Double_t bestChi2WithTwoClusters = maxChi2WithTwoClusters; | |
625 | Bool_t foundOneCluster = kFALSE; | |
626 | Bool_t foundTwoClusters = kFALSE; | |
208f139e | 627 | AliMUONTrack *newTrack = 0x0; |
96ebe67e | 628 | AliMUONVCluster *clusterCh1, *clusterCh2; |
019df241 | 629 | AliMUONTrackParam extrapTrackParam; |
7332f213 | 630 | AliMUONTrackParam extrapTrackParamAtCh; |
96ebe67e | 631 | AliMUONTrackParam extrapTrackParamAtCluster1; |
632 | AliMUONTrackParam extrapTrackParamAtCluster2; | |
633 | AliMUONTrackParam bestTrackParamAtCluster1; | |
634 | AliMUONTrackParam bestTrackParamAtCluster2; | |
635 | ||
7332f213 | 636 | // Get track parameters according to the propagation direction |
637 | if (nextStation==4) extrapTrackParamAtCh = *(AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->Last(); | |
638 | else extrapTrackParamAtCh = *(AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->First(); | |
ea94c18b | 639 | |
9bf6860b | 640 | // Printout for debuging |
641 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructor") >= 2) || (AliLog::GetGlobalDebugLevel() >= 2)) { | |
642 | cout<<endl<<"Track parameters and covariances at first cluster:"<<endl; | |
643 | extrapTrackParamAtCh.GetParameters().Print(); | |
644 | extrapTrackParamAtCh.GetCovariances().Print(); | |
645 | } | |
646 | ||
ea94c18b | 647 | // Add MCS effect |
4663da9f | 648 | Int_t currentChamber = extrapTrackParamAtCh.GetClusterPtr()->GetChamberId(); |
649 | AliMUONTrackExtrap::AddMCSEffect(&extrapTrackParamAtCh,AliMUONConstants::ChamberThicknessInX0(currentChamber),-1.); | |
ea94c18b | 650 | |
9bf6860b | 651 | // Add MCS in the missing chamber(s) if any |
9bf6860b | 652 | while (ch1 < ch2 && currentChamber > ch2 + 1) { |
ea94c18b | 653 | // extrapolation to the missing chamber |
9bf6860b | 654 | currentChamber--; |
4ea3f013 | 655 | if (!AliMUONTrackExtrap::ExtrapToZCov(&extrapTrackParamAtCh, AliMUONConstants::DefaultChamberZ(currentChamber))) return kFALSE; |
ea94c18b | 656 | // add MCS effect |
4663da9f | 657 | AliMUONTrackExtrap::AddMCSEffect(&extrapTrackParamAtCh,AliMUONConstants::ChamberThicknessInX0(currentChamber),-1.); |
ea94c18b | 658 | } |
659 | ||
660 | //Extrapolate trackCandidate to chamber "ch2" | |
4ea3f013 | 661 | if (!AliMUONTrackExtrap::ExtrapToZCov(&extrapTrackParamAtCh, AliMUONConstants::DefaultChamberZ(ch2))) return kFALSE; |
ea94c18b | 662 | |
208f139e | 663 | // Printout for debuging |
664 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructor") >= 2) || (AliLog::GetGlobalDebugLevel() >= 2)) { | |
9bf6860b | 665 | cout<<endl<<"Track parameters and covariances at first cluster extrapolated to z = "<<AliMUONConstants::DefaultChamberZ(ch2)<<":"<<endl; |
666 | extrapTrackParamAtCh.GetParameters().Print(); | |
019df241 | 667 | extrapTrackParamAtCh.GetCovariances().Print(); |
208f139e | 668 | } |
ea94c18b | 669 | |
208f139e | 670 | // Printout for debuging |
671 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
96ebe67e | 672 | cout << "FollowTrackInStation: look for clusters in chamber(1..): " << ch2+1 << endl; |
208f139e | 673 | } |
ea94c18b | 674 | |
1fef78c8 | 675 | // Ask the clustering to reconstruct new clusters around the track position in the current station |
676 | // except for station 4 and 5 that are already entirely clusterized | |
a0dc65b4 | 677 | if (GetRecoParam()->CombineClusterTrackReco()) { |
1fef78c8 | 678 | if (nextStation < 3) AskForNewClustersInStation(extrapTrackParamAtCh, clusterStore, nextStation); |
679 | } | |
680 | ||
4ea3f013 | 681 | Int_t nClusters = clusterStore.GetSize(); |
682 | Bool_t *clusterCh1Used = new Bool_t[nClusters]; | |
683 | for (Int_t i = 0; i < nClusters; i++) clusterCh1Used[i] = kFALSE; | |
684 | Int_t iCluster1; | |
685 | ||
96ebe67e | 686 | // Create iterators to loop over clusters in both chambers |
687 | TIter nextInCh1(clusterStore.CreateChamberIterator(ch1,ch1)); | |
688 | TIter nextInCh2(clusterStore.CreateChamberIterator(ch2,ch2)); | |
689 | ||
690 | // look for candidates in chamber 2 | |
691 | while ( ( clusterCh2 = static_cast<AliMUONVCluster*>(nextInCh2()) ) ) { | |
ea94c18b | 692 | |
96ebe67e | 693 | // try to add the current cluster fast |
694 | if (!TryOneClusterFast(extrapTrackParamAtCh, clusterCh2)) continue; | |
019df241 | 695 | |
96ebe67e | 696 | // try to add the current cluster accuratly |
697 | chi2WithOneCluster = TryOneCluster(extrapTrackParamAtCh, clusterCh2, extrapTrackParamAtCluster2); | |
ea94c18b | 698 | |
96ebe67e | 699 | // if good chi2 then try to attach a cluster in the other chamber too |
700 | if (chi2WithOneCluster < maxChi2WithOneCluster) { | |
701 | Bool_t foundSecondCluster = kFALSE; | |
ea94c18b | 702 | |
208f139e | 703 | // Printout for debuging |
704 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
96ebe67e | 705 | cout << "FollowTrackInStation: found one cluster in chamber(1..): " << ch2+1 |
706 | << " (Chi2 = " << chi2WithOneCluster << ")" << endl; | |
9bf6860b | 707 | clusterCh2->Print(); |
96ebe67e | 708 | cout << " look for second clusters in chamber(1..): " << ch1+1 << " ..." << endl; |
a9e2aefa | 709 | } |
ea94c18b | 710 | |
711 | // add MCS effect for next step | |
4663da9f | 712 | AliMUONTrackExtrap::AddMCSEffect(&extrapTrackParamAtCluster2,AliMUONConstants::ChamberThicknessInX0(ch2),-1.); |
ea94c18b | 713 | |
019df241 | 714 | // copy new track parameters for next step |
96ebe67e | 715 | extrapTrackParam = extrapTrackParamAtCluster2; |
019df241 | 716 | |
717 | //Extrapolate track parameters to chamber "ch1" | |
4ea3f013 | 718 | Bool_t normalExtrap = AliMUONTrackExtrap::ExtrapToZ(&extrapTrackParam, AliMUONConstants::DefaultChamberZ(ch1)); |
019df241 | 719 | |
96ebe67e | 720 | // reset cluster iterator of chamber 1 |
721 | nextInCh1.Reset(); | |
722 | iCluster1 = -1; | |
723 | ||
724 | // look for second candidates in chamber 1 | |
4ea3f013 | 725 | if (normalExtrap) while ( ( clusterCh1 = static_cast<AliMUONVCluster*>(nextInCh1()) ) ) { |
96ebe67e | 726 | iCluster1++; |
ea94c18b | 727 | |
96ebe67e | 728 | // try to add the current cluster fast |
729 | if (!TryOneClusterFast(extrapTrackParam, clusterCh1)) continue; | |
019df241 | 730 | |
4ea3f013 | 731 | // try to add the current cluster accurately |
96ebe67e | 732 | chi2WithTwoClusters = TryTwoClusters(extrapTrackParamAtCluster2, clusterCh1, extrapTrackParamAtCluster1); |
ea94c18b | 733 | |
96ebe67e | 734 | // if good chi2 then create a new track by adding the 2 clusters to the "trackCandidate" |
735 | if (chi2WithTwoClusters < maxChi2WithTwoClusters) { | |
736 | foundSecondCluster = kTRUE; | |
737 | foundTwoClusters = kTRUE; | |
ea94c18b | 738 | |
739 | // Printout for debuging | |
740 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
96ebe67e | 741 | cout << "FollowTrackInStation: found second cluster in chamber(1..): " << ch1+1 |
9bf6860b | 742 | << " (Global Chi2 = " << chi2WithTwoClusters << ")" << endl; |
743 | clusterCh1->Print(); | |
ea94c18b | 744 | } |
745 | ||
a0dc65b4 | 746 | if (GetRecoParam()->TrackAllTracks()) { |
96ebe67e | 747 | // copy trackCandidate into a new track put at the end of fRecTracksPtr and add the new clusters |
ea94c18b | 748 | newTrack = new ((*fRecTracksPtr)[fRecTracksPtr->GetLast()+1]) AliMUONTrack(trackCandidate); |
96ebe67e | 749 | UpdateTrack(*newTrack,extrapTrackParamAtCluster1,extrapTrackParamAtCluster2); |
208f139e | 750 | fNRecTracks++; |
ea94c18b | 751 | |
96ebe67e | 752 | // Tag clusterCh1 as used |
753 | clusterCh1Used[iCluster1] = kTRUE; | |
ea94c18b | 754 | |
208f139e | 755 | // Printout for debuging |
756 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
96ebe67e | 757 | cout << "FollowTrackInStation: added two clusters in station(1..): " << nextStation+1 << endl; |
208f139e | 758 | if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump(); |
a9e2aefa | 759 | } |
ea94c18b | 760 | |
96ebe67e | 761 | } else if (chi2WithTwoClusters < bestChi2WithTwoClusters) { |
762 | // keep track of the best couple of clusters | |
763 | bestChi2WithTwoClusters = chi2WithTwoClusters; | |
764 | bestTrackParamAtCluster1 = extrapTrackParamAtCluster1; | |
765 | bestTrackParamAtCluster2 = extrapTrackParamAtCluster2; | |
208f139e | 766 | } |
ea94c18b | 767 | |
a9e2aefa | 768 | } |
ea94c18b | 769 | |
d0bfce8d | 770 | } |
ea94c18b | 771 | |
96ebe67e | 772 | // if no clusterCh1 found then consider to add clusterCh2 only |
773 | if (!foundSecondCluster) { | |
774 | foundOneCluster = kTRUE; | |
ea94c18b | 775 | |
a0dc65b4 | 776 | if (GetRecoParam()->TrackAllTracks()) { |
96ebe67e | 777 | // copy trackCandidate into a new track put at the end of fRecTracksPtr and add the new cluster |
ea94c18b | 778 | newTrack = new ((*fRecTracksPtr)[fRecTracksPtr->GetLast()+1]) AliMUONTrack(trackCandidate); |
96ebe67e | 779 | UpdateTrack(*newTrack,extrapTrackParamAtCluster2); |
208f139e | 780 | fNRecTracks++; |
ea94c18b | 781 | |
208f139e | 782 | // Printout for debuging |
783 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
96ebe67e | 784 | cout << "FollowTrackInStation: added one cluster in chamber(1..): " << ch2+1 << endl; |
208f139e | 785 | if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump(); |
786 | } | |
ea94c18b | 787 | |
96ebe67e | 788 | } else if (!foundTwoClusters && chi2WithOneCluster < bestChi2WithOneCluster) { |
789 | // keep track of the best single cluster except if a couple of clusters has already been found | |
790 | bestChi2WithOneCluster = chi2WithOneCluster; | |
791 | bestTrackParamAtCluster1 = extrapTrackParamAtCluster2; | |
208f139e | 792 | } |
ea94c18b | 793 | |
d0bfce8d | 794 | } |
ea94c18b | 795 | |
208f139e | 796 | } |
ea94c18b | 797 | |
208f139e | 798 | } |
ea94c18b | 799 | |
208f139e | 800 | // look for candidates in chamber 1 not already attached to a track |
96ebe67e | 801 | // if we want to keep all possible tracks or if no good couple of clusters has been found |
a0dc65b4 | 802 | if (GetRecoParam()->TrackAllTracks() || !foundTwoClusters) { |
ea94c18b | 803 | |
ea94c18b | 804 | // add MCS effect for next step |
4663da9f | 805 | AliMUONTrackExtrap::AddMCSEffect(&extrapTrackParamAtCh,AliMUONConstants::ChamberThicknessInX0(ch2),-1.); |
019df241 | 806 | |
807 | //Extrapolate trackCandidate to chamber "ch1" | |
4ea3f013 | 808 | Bool_t normalExtrap = AliMUONTrackExtrap::ExtrapToZCov(&extrapTrackParamAtCh, AliMUONConstants::DefaultChamberZ(ch1)); |
019df241 | 809 | |
9bf6860b | 810 | // Printout for debuging |
811 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructor") >= 2) || (AliLog::GetGlobalDebugLevel() >= 2)) { | |
812 | cout<<endl<<"Track parameters and covariances at first cluster extrapolated to z = "<<AliMUONConstants::DefaultChamberZ(ch1)<<":"<<endl; | |
813 | extrapTrackParamAtCh.GetParameters().Print(); | |
814 | extrapTrackParamAtCh.GetCovariances().Print(); | |
815 | } | |
816 | ||
817 | // Printout for debuging | |
818 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
819 | cout << "FollowTrackInStation: look for single clusters in chamber(1..): " << ch1+1 << endl; | |
820 | } | |
821 | ||
96ebe67e | 822 | // reset cluster iterator of chamber 1 |
823 | nextInCh1.Reset(); | |
824 | iCluster1 = -1; | |
825 | ||
826 | // look for second candidates in chamber 1 | |
4ea3f013 | 827 | if (normalExtrap) while ( ( clusterCh1 = static_cast<AliMUONVCluster*>(nextInCh1()) ) ) { |
96ebe67e | 828 | iCluster1++; |
ea94c18b | 829 | |
96ebe67e | 830 | if (clusterCh1Used[iCluster1]) continue; // Skip cluster already used |
ea94c18b | 831 | |
96ebe67e | 832 | // try to add the current cluster fast |
833 | if (!TryOneClusterFast(extrapTrackParamAtCh, clusterCh1)) continue; | |
019df241 | 834 | |
96ebe67e | 835 | // try to add the current cluster accuratly |
836 | chi2WithOneCluster = TryOneCluster(extrapTrackParamAtCh, clusterCh1, extrapTrackParamAtCluster1); | |
9bf6860b | 837 | |
96ebe67e | 838 | // if good chi2 then consider to add clusterCh1 |
839 | // We do not try to attach a cluster in the other chamber too since it has already been done above | |
840 | if (chi2WithOneCluster < maxChi2WithOneCluster) { | |
841 | foundOneCluster = kTRUE; | |
9bf6860b | 842 | |
ea94c18b | 843 | // Printout for debuging |
844 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
96ebe67e | 845 | cout << "FollowTrackInStation: found one cluster in chamber(1..): " << ch1+1 |
846 | << " (Chi2 = " << chi2WithOneCluster << ")" << endl; | |
9bf6860b | 847 | clusterCh1->Print(); |
ea94c18b | 848 | } |
849 | ||
a0dc65b4 | 850 | if (GetRecoParam()->TrackAllTracks()) { |
96ebe67e | 851 | // copy trackCandidate into a new track put at the end of fRecTracksPtr and add the new cluster |
ea94c18b | 852 | newTrack = new ((*fRecTracksPtr)[fRecTracksPtr->GetLast()+1]) AliMUONTrack(trackCandidate); |
96ebe67e | 853 | UpdateTrack(*newTrack,extrapTrackParamAtCluster1); |
208f139e | 854 | fNRecTracks++; |
ea94c18b | 855 | |
856 | // Printout for debuging | |
208f139e | 857 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { |
96ebe67e | 858 | cout << "FollowTrackInStation: added one cluster in chamber(1..): " << ch1+1 << endl; |
208f139e | 859 | if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump(); |
860 | } | |
ea94c18b | 861 | |
96ebe67e | 862 | } else if (chi2WithOneCluster < bestChi2WithOneCluster) { |
863 | // keep track of the best single cluster except if a couple of clusters has already been found | |
864 | bestChi2WithOneCluster = chi2WithOneCluster; | |
865 | bestTrackParamAtCluster1 = extrapTrackParamAtCluster1; | |
208f139e | 866 | } |
ea94c18b | 867 | |
d0bfce8d | 868 | } |
ea94c18b | 869 | |
208f139e | 870 | } |
ea94c18b | 871 | |
208f139e | 872 | } |
ea94c18b | 873 | |
208f139e | 874 | // fill out the best track if required else clean up the fRecTracksPtr array |
a0dc65b4 | 875 | if (!GetRecoParam()->TrackAllTracks()) { |
96ebe67e | 876 | if (foundTwoClusters) { |
877 | UpdateTrack(trackCandidate,bestTrackParamAtCluster1,bestTrackParamAtCluster2); | |
ea94c18b | 878 | |
208f139e | 879 | // Printout for debuging |
880 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
96ebe67e | 881 | cout << "FollowTrackInStation: added the two best clusters in station(1..): " << nextStation+1 << endl; |
208f139e | 882 | if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump(); |
a9e2aefa | 883 | } |
ea94c18b | 884 | |
96ebe67e | 885 | } else if (foundOneCluster) { |
886 | UpdateTrack(trackCandidate,bestTrackParamAtCluster1); | |
ea94c18b | 887 | |
208f139e | 888 | // Printout for debuging |
889 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
96ebe67e | 890 | cout << "FollowTrackInStation: added the best cluster in chamber(1..): " << bestTrackParamAtCluster1.GetClusterPtr()->GetChamberId()+1 << endl; |
208f139e | 891 | if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump(); |
04b5ea16 | 892 | } |
ea94c18b | 893 | |
dd230855 | 894 | } else { |
96ebe67e | 895 | delete [] clusterCh1Used; |
dd230855 | 896 | return kFALSE; |
897 | } | |
ea94c18b | 898 | |
96ebe67e | 899 | } else if (foundOneCluster || foundTwoClusters) { |
ea94c18b | 900 | |
901 | // remove obsolete track | |
902 | fRecTracksPtr->Remove(&trackCandidate); | |
903 | fNRecTracks--; | |
904 | ||
dd230855 | 905 | } else { |
96ebe67e | 906 | delete [] clusterCh1Used; |
dd230855 | 907 | return kFALSE; |
908 | } | |
ea94c18b | 909 | |
96ebe67e | 910 | delete [] clusterCh1Used; |
ea94c18b | 911 | return kTRUE; |
912 | ||
913 | } | |
914 | ||
915 | //__________________________________________________________________________ | |
96ebe67e | 916 | Double_t AliMUONTrackReconstructor::TryTwoClusters(const AliMUONTrackParam &trackParamAtCluster1, AliMUONVCluster* cluster2, |
917 | AliMUONTrackParam &trackParamAtCluster2) | |
ea94c18b | 918 | { |
96ebe67e | 919 | /// Test the compatibility between the track and the 2 clusters together (using trackParam's covariance matrix): |
920 | /// return the corresponding Chi2 accounting for covariances between the 2 clusters | |
921 | /// return trackParamAtCluster1 & 2 | |
ea94c18b | 922 | |
96ebe67e | 923 | // extrapolate track parameters at the z position of the second cluster (no need to extrapolate the covariances) |
4ea3f013 | 924 | // and set pointer to cluster into trackParamAtCluster |
96ebe67e | 925 | trackParamAtCluster2.SetParameters(trackParamAtCluster1.GetParameters()); |
926 | trackParamAtCluster2.SetZ(trackParamAtCluster1.GetZ()); | |
96ebe67e | 927 | trackParamAtCluster2.SetClusterPtr(cluster2); |
4ea3f013 | 928 | if (!AliMUONTrackExtrap::ExtrapToZ(&trackParamAtCluster2, cluster2->GetZ())) return 2.*AliMUONTrack::MaxChi2(); |
ea94c18b | 929 | |
96ebe67e | 930 | // Set differences between track and the 2 clusters in the bending and non bending directions |
931 | AliMUONVCluster* cluster1 = trackParamAtCluster1.GetClusterPtr(); | |
ea94c18b | 932 | TMatrixD dPos(4,1); |
96ebe67e | 933 | dPos(0,0) = cluster1->GetX() - trackParamAtCluster1.GetNonBendingCoor(); |
934 | dPos(1,0) = cluster1->GetY() - trackParamAtCluster1.GetBendingCoor(); | |
935 | dPos(2,0) = cluster2->GetX() - trackParamAtCluster2.GetNonBendingCoor(); | |
936 | dPos(3,0) = cluster2->GetY() - trackParamAtCluster2.GetBendingCoor(); | |
ea94c18b | 937 | |
96ebe67e | 938 | // Calculate the error matrix from the track parameter covariances at first cluster |
ea94c18b | 939 | TMatrixD error(4,4); |
940 | error.Zero(); | |
96ebe67e | 941 | if (trackParamAtCluster1.CovariancesExist()) { |
942 | // Save track parameters at first cluster | |
943 | TMatrixD paramAtCluster1Save(trackParamAtCluster1.GetParameters()); | |
944 | ||
945 | // Save track coordinates at second cluster | |
946 | Double_t nonBendingCoor2 = trackParamAtCluster2.GetNonBendingCoor(); | |
947 | Double_t bendingCoor2 = trackParamAtCluster2.GetBendingCoor(); | |
ea94c18b | 948 | |
96ebe67e | 949 | // copy track parameters at first cluster for jacobian calculation |
950 | AliMUONTrackParam trackParam(trackParamAtCluster1); | |
ea94c18b | 951 | |
96ebe67e | 952 | // Get the pointer to the parameter covariance matrix at first cluster |
953 | const TMatrixD& kParamCov = trackParam.GetCovariances(); | |
ea94c18b | 954 | |
955 | // Calculate the jacobian related to the transformation between track parameters | |
96ebe67e | 956 | // at first cluster and track coordinates at the 2 cluster z-positions |
ea94c18b | 957 | TMatrixD jacob(4,5); |
958 | jacob.Zero(); | |
96ebe67e | 959 | // first derivative at the first cluster: |
ea94c18b | 960 | jacob(0,0) = 1.; // dx1/dx |
961 | jacob(1,2) = 1.; // dy1/dy | |
96ebe67e | 962 | // first derivative at the second cluster: |
ea94c18b | 963 | TMatrixD dParam(5,1); |
6b191dea | 964 | Double_t direction[5] = {-1.,-1.,1.,1.,-1.}; |
ea94c18b | 965 | for (Int_t i=0; i<5; i++) { |
966 | // Skip jacobian calculation for parameters with no associated error | |
967 | if (kParamCov(i,i) == 0.) continue; | |
968 | // Small variation of parameter i only | |
969 | for (Int_t j=0; j<5; j++) { | |
970 | if (j==i) { | |
971 | dParam(j,0) = TMath::Sqrt(kParamCov(i,i)); | |
6b191dea | 972 | dParam(j,0) *= TMath::Sign(1.,direction[j]*paramAtCluster1Save(j,0)); // variation always in the same direction |
ea94c18b | 973 | } else dParam(j,0) = 0.; |
974 | } | |
975 | ||
96ebe67e | 976 | // Set new track parameters at first cluster |
977 | trackParam.SetParameters(paramAtCluster1Save); | |
978 | trackParam.AddParameters(dParam); | |
979 | trackParam.SetZ(cluster1->GetZ()); | |
ea94c18b | 980 | |
96ebe67e | 981 | // Extrapolate new track parameters to the z position of the second cluster |
4ea3f013 | 982 | if (!AliMUONTrackExtrap::ExtrapToZ(&trackParam,cluster2->GetZ())) return 2.*AliMUONTrack::MaxChi2(); |
ea94c18b | 983 | |
984 | // Calculate the jacobian | |
96ebe67e | 985 | jacob(2,i) = (trackParam.GetNonBendingCoor() - nonBendingCoor2) / dParam(i,0); // dx2/dParami |
986 | jacob(3,i) = (trackParam.GetBendingCoor() - bendingCoor2 ) / dParam(i,0); // dy2/dParami | |
208f139e | 987 | } |
ea94c18b | 988 | |
989 | // Calculate the error matrix | |
990 | TMatrixD tmp(jacob,TMatrixD::kMult,kParamCov); | |
991 | error = TMatrixD(tmp,TMatrixD::kMultTranspose,jacob); | |
992 | } | |
993 | ||
96ebe67e | 994 | // Add cluster resolution to the error matrix |
995 | error(0,0) += cluster1->GetErrX2(); | |
996 | error(1,1) += cluster1->GetErrY2(); | |
997 | error(2,2) += cluster2->GetErrX2(); | |
998 | error(3,3) += cluster2->GetErrY2(); | |
ea94c18b | 999 | |
1000 | // invert the error matrix for Chi2 calculation | |
1001 | if (error.Determinant() != 0) { | |
1002 | error.Invert(); | |
208f139e | 1003 | } else { |
ea94c18b | 1004 | AliWarning(" Determinant error=0"); |
4ea3f013 | 1005 | return 2.*AliMUONTrack::MaxChi2(); |
208f139e | 1006 | } |
1007 | ||
ea94c18b | 1008 | // Compute the Chi2 value |
1009 | TMatrixD tmp2(dPos,TMatrixD::kTransposeMult,error); | |
1010 | TMatrixD result(tmp2,TMatrixD::kMult,dPos); | |
1011 | ||
1012 | return result(0,0); | |
1013 | ||
1014 | } | |
1015 | ||
1016 | //__________________________________________________________________________ | |
96ebe67e | 1017 | void AliMUONTrackReconstructor::UpdateTrack(AliMUONTrack &track, AliMUONTrackParam &trackParamAtCluster) |
ea94c18b | 1018 | { |
96ebe67e | 1019 | /// Add 1 cluster to the track candidate |
ea94c18b | 1020 | /// Update chi2 of the track |
1021 | ||
1022 | // Compute local chi2 | |
96ebe67e | 1023 | AliMUONVCluster* cluster = trackParamAtCluster.GetClusterPtr(); |
1024 | Double_t deltaX = trackParamAtCluster.GetNonBendingCoor() - cluster->GetX(); | |
1025 | Double_t deltaY = trackParamAtCluster.GetBendingCoor() - cluster->GetY(); | |
1026 | Double_t localChi2 = deltaX*deltaX / cluster->GetErrX2() + | |
1027 | deltaY*deltaY / cluster->GetErrY2(); | |
ea94c18b | 1028 | |
96ebe67e | 1029 | // Flag cluster as being not removable |
a0dc65b4 | 1030 | if (GetRecoParam()->RequestStation(cluster->GetChamberId()/2)) |
9bf6860b | 1031 | trackParamAtCluster.SetRemovable(kFALSE); |
1032 | else trackParamAtCluster.SetRemovable(kTRUE); | |
96ebe67e | 1033 | trackParamAtCluster.SetLocalChi2(0.); // --> Local chi2 not used |
5f4ceff2 | 1034 | |
ea94c18b | 1035 | // Update the chi2 of the new track |
96ebe67e | 1036 | track.SetGlobalChi2(track.GetGlobalChi2() + localChi2); |
ea94c18b | 1037 | |
96ebe67e | 1038 | // Update TrackParamAtCluster |
1039 | track.AddTrackParamAtCluster(trackParamAtCluster,*cluster); | |
ea94c18b | 1040 | |
04b5ea16 | 1041 | } |
1042 | ||
de2cd600 | 1043 | //__________________________________________________________________________ |
96ebe67e | 1044 | void AliMUONTrackReconstructor::UpdateTrack(AliMUONTrack &track, AliMUONTrackParam &trackParamAtCluster1, AliMUONTrackParam &trackParamAtCluster2) |
ea94c18b | 1045 | { |
96ebe67e | 1046 | /// Add 2 clusters to the track candidate |
ea94c18b | 1047 | /// Update track and local chi2 |
1048 | ||
96ebe67e | 1049 | // Update local chi2 at first cluster |
1050 | AliMUONVCluster* cluster1 = trackParamAtCluster1.GetClusterPtr(); | |
1051 | Double_t deltaX = trackParamAtCluster1.GetNonBendingCoor() - cluster1->GetX(); | |
1052 | Double_t deltaY = trackParamAtCluster1.GetBendingCoor() - cluster1->GetY(); | |
1053 | Double_t localChi2AtCluster1 = deltaX*deltaX / cluster1->GetErrX2() + | |
1054 | deltaY*deltaY / cluster1->GetErrY2(); | |
1055 | trackParamAtCluster1.SetLocalChi2(localChi2AtCluster1); | |
ea94c18b | 1056 | |
96ebe67e | 1057 | // Flag first cluster as being removable |
1058 | trackParamAtCluster1.SetRemovable(kTRUE); | |
ea94c18b | 1059 | |
96ebe67e | 1060 | // Update local chi2 at second cluster |
1061 | AliMUONVCluster* cluster2 = trackParamAtCluster2.GetClusterPtr(); | |
1062 | deltaX = trackParamAtCluster2.GetNonBendingCoor() - cluster2->GetX(); | |
1063 | deltaY = trackParamAtCluster2.GetBendingCoor() - cluster2->GetY(); | |
1064 | Double_t localChi2AtCluster2 = deltaX*deltaX / cluster2->GetErrX2() + | |
1065 | deltaY*deltaY / cluster2->GetErrY2(); | |
1066 | trackParamAtCluster2.SetLocalChi2(localChi2AtCluster2); | |
ea94c18b | 1067 | |
96ebe67e | 1068 | // Flag first cluster as being removable |
1069 | trackParamAtCluster2.SetRemovable(kTRUE); | |
ea94c18b | 1070 | |
1071 | // Update the chi2 of the new track | |
96ebe67e | 1072 | track.SetGlobalChi2(track.GetGlobalChi2() + localChi2AtCluster1 + localChi2AtCluster2); |
ea94c18b | 1073 | |
96ebe67e | 1074 | // Update TrackParamAtCluster |
1075 | track.AddTrackParamAtCluster(trackParamAtCluster1,*cluster1); | |
1076 | track.AddTrackParamAtCluster(trackParamAtCluster2,*cluster2); | |
ea94c18b | 1077 | |
1078 | } | |
1079 | ||
1080 | //__________________________________________________________________________ | |
1fef78c8 | 1081 | Bool_t AliMUONTrackReconstructor::RecoverTrack(AliMUONTrack &trackCandidate, AliMUONVClusterStore& clusterStore, Int_t nextStation) |
ea94c18b | 1082 | { |
1083 | /// Try to recover the track candidate in the next station | |
96ebe67e | 1084 | /// by removing the worst of the two clusters attached in the current station |
ea94c18b | 1085 | /// Return kTRUE if recovering succeeds |
1086 | AliDebug(1,"Enter RecoverTrack"); | |
1087 | ||
96ebe67e | 1088 | // Do not try to recover track until we have attached cluster(s) on station(1..) 3 |
ea94c18b | 1089 | if (nextStation > 1) return kFALSE; |
1090 | ||
96ebe67e | 1091 | Int_t worstClusterNumber = -1; |
9bf6860b | 1092 | Double_t localChi2, worstLocalChi2 = -1.; |
ea94c18b | 1093 | |
96ebe67e | 1094 | // Look for the cluster to remove |
1095 | for (Int_t clusterNumber = 0; clusterNumber < 2; clusterNumber++) { | |
1096 | AliMUONTrackParam *trackParamAtCluster = (AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->UncheckedAt(clusterNumber); | |
ea94c18b | 1097 | |
9bf6860b | 1098 | // check if current cluster is in the previous station |
1099 | if (trackParamAtCluster->GetClusterPtr()->GetChamberId()/2 != nextStation+1) break; | |
1100 | ||
96ebe67e | 1101 | // check if current cluster is removable |
1102 | if (!trackParamAtCluster->IsRemovable()) return kFALSE; | |
ea94c18b | 1103 | |
9bf6860b | 1104 | // reset the current cluster as beig not removable if it is on a required station |
a0dc65b4 | 1105 | if (GetRecoParam()->RequestStation(nextStation+1)) trackParamAtCluster->SetRemovable(kFALSE); |
9bf6860b | 1106 | |
96ebe67e | 1107 | // Pick up cluster with the worst chi2 |
1108 | localChi2 = trackParamAtCluster->GetLocalChi2(); | |
ea94c18b | 1109 | if (localChi2 > worstLocalChi2) { |
1110 | worstLocalChi2 = localChi2; | |
96ebe67e | 1111 | worstClusterNumber = clusterNumber; |
ea94c18b | 1112 | } |
9bf6860b | 1113 | |
ea94c18b | 1114 | } |
1115 | ||
9bf6860b | 1116 | // check if worst cluster found |
1117 | if (worstClusterNumber < 0) return kFALSE; | |
ea94c18b | 1118 | |
96ebe67e | 1119 | // Remove the worst cluster |
1120 | trackCandidate.RemoveTrackParamAtCluster((AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->UncheckedAt(worstClusterNumber)); | |
ea94c18b | 1121 | |
1122 | // Re-fit the track: | |
1123 | // Do not take into account the multiple scattering to speed up the fit | |
1124 | // Calculate the track parameter covariance matrix | |
96ebe67e | 1125 | Fit(trackCandidate, kFALSE, kFALSE, kTRUE); |
ea94c18b | 1126 | |
4ea3f013 | 1127 | // skip track if the normalized chi2 is too high |
1128 | if (trackCandidate.GetNormalizedChi2() > GetRecoParam()->GetSigmaCutForTracking() * GetRecoParam()->GetSigmaCutForTracking()) return kFALSE; | |
1129 | ||
6b191dea | 1130 | // skip track out of limits |
1131 | if (!IsAcceptable(*((AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->First()))) return kFALSE; | |
89c8d66d | 1132 | |
96ebe67e | 1133 | // Look for new cluster(s) in next station |
1134 | return FollowTrackInStation(trackCandidate,clusterStore,nextStation); | |
ea94c18b | 1135 | |
1136 | } | |
1137 | ||
1138 | //__________________________________________________________________________ | |
96ebe67e | 1139 | void AliMUONTrackReconstructor::SetVertexErrXY2ForFit(AliMUONTrack &trackCandidate) |
de2cd600 | 1140 | { |
96ebe67e | 1141 | /// Compute the vertex resolution square from natural vertex dispersion and |
208f139e | 1142 | /// multiple scattering effets according to trackCandidate path in absorber |
1143 | /// It is necessary to account for multiple scattering effects here instead of during the fit of | |
1144 | /// the "trackCandidate" to do not influence the result by changing track resolution at vertex | |
1145 | AliDebug(1,"Enter SetVertexForFit"); | |
de2cd600 | 1146 | |
a0dc65b4 | 1147 | Double_t nonBendingReso2 = GetRecoParam()->GetNonBendingVertexDispersion() * |
1148 | GetRecoParam()->GetNonBendingVertexDispersion(); | |
1149 | Double_t bendingReso2 = GetRecoParam()->GetBendingVertexDispersion() * | |
1150 | GetRecoParam()->GetBendingVertexDispersion(); | |
96ebe67e | 1151 | |
208f139e | 1152 | // add multiple scattering effets |
96ebe67e | 1153 | AliMUONTrackParam paramAtVertex(*((AliMUONTrackParam*)(trackCandidate.GetTrackParamAtCluster()->First()))); |
208f139e | 1154 | paramAtVertex.DeleteCovariances(); // to be sure to account only for multiple scattering |
4ea3f013 | 1155 | if (!AliMUONTrackExtrap::ExtrapToZ(¶mAtVertex,AliMUONConstants::AbsZEnd())) { |
1156 | nonBendingReso2 = 0.; | |
1157 | bendingReso2 = 0.; | |
1158 | } else { | |
1159 | AliMUONTrackExtrap::ExtrapToVertexUncorrected(¶mAtVertex,0.); | |
1160 | const TMatrixD& kParamCov = paramAtVertex.GetCovariances(); | |
1161 | nonBendingReso2 += kParamCov(0,0); | |
1162 | bendingReso2 += kParamCov(2,2); | |
1163 | } | |
96ebe67e | 1164 | |
1165 | // Set the vertex resolution square | |
1166 | trackCandidate.SetVertexErrXY2(nonBendingReso2,bendingReso2); | |
208f139e | 1167 | } |
1168 | ||
1169 | //__________________________________________________________________________ | |
96ebe67e | 1170 | void AliMUONTrackReconstructor::Fit(AliMUONTrack &track, Bool_t includeMCS, Bool_t fitWithVertex, Bool_t calcCov) |
208f139e | 1171 | { |
96ebe67e | 1172 | /// Fit the track |
1173 | /// w/wo multiple Coulomb scattering according to "includeMCS". | |
1174 | /// w/wo constraining the vertex according to "fitWithVertex". | |
1175 | /// calculating or not the covariance matrix according to "calcCov". | |
7332f213 | 1176 | AliDebug(1,"Enter Fit"); |
de2cd600 | 1177 | |
208f139e | 1178 | Double_t benC, errorParam, invBenP, nonBenC, x, y; |
de2cd600 | 1179 | AliMUONTrackParam *trackParam; |
96ebe67e | 1180 | Double_t arg[1], fedm, errdef, globalChi2; |
208f139e | 1181 | Int_t npari, nparx; |
1182 | Int_t status, covStatus; | |
1183 | ||
8cde4af5 | 1184 | // Instantiate gMinuit if not already done |
1185 | if (!gMinuit) gMinuit = new TMinuit(6); | |
208f139e | 1186 | // Clear MINUIT parameters |
1187 | gMinuit->mncler(); | |
1188 | // Give the fitted track to MINUIT | |
ea94c18b | 1189 | gMinuit->SetObjectFit(&track); |
208f139e | 1190 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructor") >= 2) || (AliLog::GetGlobalDebugLevel() >= 2)) { |
1191 | // Define print level | |
1192 | arg[0] = 1; | |
1193 | gMinuit->mnexcm("SET PRI", arg, 1, status); | |
1194 | // Print covariance matrix | |
1195 | gMinuit->mnexcm("SHO COV", arg, 0, status); | |
1196 | } else { | |
1197 | arg[0] = -1; | |
1198 | gMinuit->mnexcm("SET PRI", arg, 1, status); | |
1199 | } | |
de2cd600 | 1200 | // No warnings |
208f139e | 1201 | gMinuit->mnexcm("SET NOW", arg, 0, status); |
1202 | // Define strategy | |
1203 | //arg[0] = 2; | |
1204 | //gMinuit->mnexcm("SET STR", arg, 1, status); | |
1205 | ||
ea94c18b | 1206 | // set flag w/wo multiple scattering according to "includeMCS" |
96ebe67e | 1207 | track.FitWithMCS(includeMCS); |
ea94c18b | 1208 | if (includeMCS) { |
96ebe67e | 1209 | // compute cluster weights only once |
4ea3f013 | 1210 | if (!track.UpdateTrackParamAtCluster() || !track.ComputeClusterWeights()) { |
ea94c18b | 1211 | AliWarning("cannot take into account the multiple scattering effects"); |
96ebe67e | 1212 | track.FitWithMCS(kFALSE); |
ea94c18b | 1213 | } |
1214 | } | |
1215 | ||
96ebe67e | 1216 | track.FitWithVertex(fitWithVertex); |
1217 | if (fitWithVertex) SetVertexErrXY2ForFit(track); | |
1218 | ||
ea94c18b | 1219 | // Set fitting function |
1220 | gMinuit->SetFCN(TrackChi2); | |
208f139e | 1221 | |
1222 | // Set fitted parameters (!! The order is very important for the covariance matrix !!) | |
9bf6860b | 1223 | // Mandatory limits to avoid NaN values of parameters |
96ebe67e | 1224 | trackParam = (AliMUONTrackParam*) (track.GetTrackParamAtCluster()->First()); |
a0dc65b4 | 1225 | Double_t maxIBM = 1. / GetRecoParam()->GetMinBendingMomentum(); |
208f139e | 1226 | gMinuit->mnparm(0, "X", trackParam->GetNonBendingCoor(), 0.03, -500.0, 500.0, status); |
9bf6860b | 1227 | gMinuit->mnparm(1, "NonBenS", trackParam->GetNonBendingSlope(), 0.001, -1., 1., status); |
208f139e | 1228 | gMinuit->mnparm(2, "Y", trackParam->GetBendingCoor(), 0.10, -500.0, 500.0, status); |
9bf6860b | 1229 | gMinuit->mnparm(3, "BenS", trackParam->GetBendingSlope(), 0.001, -1.5, 1.5, status); |
1230 | gMinuit->mnparm(4, "InvBenP", trackParam->GetInverseBendingMomentum(), 0.003, -maxIBM, maxIBM, status); | |
208f139e | 1231 | |
de2cd600 | 1232 | // minimization |
208f139e | 1233 | gMinuit->mnexcm("MIGRAD", arg, 0, status); |
1234 | ||
1235 | // Calculate the covariance matrix more accurately if required | |
1236 | if (calcCov) gMinuit->mnexcm("HESSE", arg, 0, status); | |
8cde4af5 | 1237 | |
de2cd600 | 1238 | // get results into "invBenP", "benC", "nonBenC" ("x", "y") |
208f139e | 1239 | gMinuit->GetParameter(0, x, errorParam); |
1240 | trackParam->SetNonBendingCoor(x); | |
1241 | gMinuit->GetParameter(1, nonBenC, errorParam); | |
de2cd600 | 1242 | trackParam->SetNonBendingSlope(nonBenC); |
208f139e | 1243 | gMinuit->GetParameter(2, y, errorParam); |
1244 | trackParam->SetBendingCoor(y); | |
1245 | gMinuit->GetParameter(3, benC, errorParam); | |
1246 | trackParam->SetBendingSlope(benC); | |
1247 | gMinuit->GetParameter(4, invBenP, errorParam); | |
1248 | trackParam->SetInverseBendingMomentum(invBenP); | |
1249 | ||
de2cd600 | 1250 | // global result of the fit |
96ebe67e | 1251 | gMinuit->mnstat(globalChi2, fedm, errdef, npari, nparx, covStatus); |
1252 | track.SetGlobalChi2(globalChi2); | |
208f139e | 1253 | |
1254 | // Get the covariance matrix if required | |
1255 | if (calcCov) { | |
1256 | // Covariance matrix according to HESSE status | |
1257 | // If problem then keep only the diagonal terms (variances) | |
1258 | Double_t matrix[5][5]; | |
1259 | gMinuit->mnemat(&matrix[0][0],5); | |
1260 | if (covStatus == 3) trackParam->SetCovariances(matrix); | |
1261 | else trackParam->SetVariances(matrix); | |
ea94c18b | 1262 | } else trackParam->DeleteCovariances(); |
208f139e | 1263 | |
de2cd600 | 1264 | } |
1265 | ||
1266 | //__________________________________________________________________________ | |
ea94c18b | 1267 | void TrackChi2(Int_t & /*nParam*/, Double_t * /*gradient*/, Double_t &chi2, Double_t *param, Int_t /*flag*/) |
de2cd600 | 1268 | { |
ea94c18b | 1269 | /// Return the "Chi2" to be minimized with Minuit for track fitting. |
96ebe67e | 1270 | /// Assumes that the trackParamAtCluster are sorted according to increasing Z. |
1271 | /// Track parameters at each cluster are updated accordingly. | |
ea94c18b | 1272 | /// Vertex is used according to the flag "trackBeingFitted->GetFitWithVertex()". |
1273 | /// Multiple Coulomb scattering is taken into account according to the flag "trackBeingFitted->GetFitWithMCS()". | |
208f139e | 1274 | |
1275 | AliMUONTrack *trackBeingFitted = (AliMUONTrack*) gMinuit->GetObjectFit(); | |
96ebe67e | 1276 | AliMUONTrackParam* trackParamAtCluster = (AliMUONTrackParam*) trackBeingFitted->GetTrackParamAtCluster()->First(); |
208f139e | 1277 | Double_t dX, dY; |
ea94c18b | 1278 | chi2 = 0.; // initialize chi2 |
208f139e | 1279 | |
ea94c18b | 1280 | // update track parameters |
96ebe67e | 1281 | trackParamAtCluster->SetNonBendingCoor(param[0]); |
1282 | trackParamAtCluster->SetNonBendingSlope(param[1]); | |
1283 | trackParamAtCluster->SetBendingCoor(param[2]); | |
1284 | trackParamAtCluster->SetBendingSlope(param[3]); | |
1285 | trackParamAtCluster->SetInverseBendingMomentum(param[4]); | |
4ea3f013 | 1286 | if (!trackBeingFitted->UpdateTrackParamAtCluster()) { |
1287 | chi2 = 2.*AliMUONTrack::MaxChi2(); | |
1288 | return; | |
1289 | } | |
208f139e | 1290 | |
1291 | // Take the vertex into account in the fit if required | |
96ebe67e | 1292 | if (trackBeingFitted->FitWithVertex()) { |
1293 | Double_t nonBendingReso2,bendingReso2; | |
1294 | trackBeingFitted->GetVertexErrXY2(nonBendingReso2,bendingReso2); | |
4ea3f013 | 1295 | AliMUONTrackParam paramAtVertex(*trackParamAtCluster); |
1296 | if (nonBendingReso2 != 0. && bendingReso2 != 0. && AliMUONTrackExtrap::ExtrapToZ(¶mAtVertex, 0.)) { // vextex position = (0,0,0) | |
96ebe67e | 1297 | dX = paramAtVertex.GetNonBendingCoor(); |
1298 | dY = paramAtVertex.GetBendingCoor(); | |
1299 | chi2 += dX * dX / nonBendingReso2 + dY * dY / bendingReso2; | |
4ea3f013 | 1300 | } else { |
1301 | chi2 = 2.*AliMUONTrack::MaxChi2(); | |
1302 | return; | |
208f139e | 1303 | } |
de2cd600 | 1304 | } |
208f139e | 1305 | |
ea94c18b | 1306 | // compute chi2 w/wo multiple scattering |
96ebe67e | 1307 | chi2 += trackBeingFitted->ComputeGlobalChi2(trackBeingFitted->FitWithMCS()); |
b709ac13 | 1308 | |
1309 | } | |
1310 | ||
1311 | //__________________________________________________________________________ | |
89c8d66d | 1312 | Bool_t AliMUONTrackReconstructor::ComplementTracks(const AliMUONVClusterStore& clusterStore) |
b709ac13 | 1313 | { |
1314 | /// Complete tracks by adding missing clusters (if there is an overlap between | |
89c8d66d | 1315 | /// two detection elements, the track may have two clusters in the same chamber). |
1316 | /// Re-fit track parameters and covariances. | |
1317 | /// Return kTRUE if one or more tracks have been complemented. | |
b709ac13 | 1318 | AliDebug(1,"Enter ComplementTracks"); |
1319 | ||
1320 | Int_t chamberId, detElemId; | |
96ebe67e | 1321 | Double_t chi2OfCluster, bestChi2OfCluster; |
a0dc65b4 | 1322 | Double_t sigmaCut2 = GetRecoParam()->GetSigmaCutForTracking() * |
1323 | GetRecoParam()->GetSigmaCutForTracking(); | |
89c8d66d | 1324 | Bool_t foundOneCluster, trackModified, hasChanged = kFALSE; |
96ebe67e | 1325 | AliMUONVCluster* cluster; |
1326 | AliMUONTrackParam *trackParam, *nextTrackParam, copyOfTrackParam, trackParamAtCluster, bestTrackParamAtCluster; | |
b709ac13 | 1327 | |
b709ac13 | 1328 | AliMUONTrack *track = (AliMUONTrack*) fRecTracksPtr->First(); |
1329 | while (track) { | |
1330 | trackModified = kFALSE; | |
1331 | ||
96ebe67e | 1332 | trackParam = (AliMUONTrackParam*)track->GetTrackParamAtCluster()->First(); |
b709ac13 | 1333 | while (trackParam) { |
96ebe67e | 1334 | foundOneCluster = kFALSE; |
1335 | bestChi2OfCluster = 2. * sigmaCut2; // 2 because 2 quantities in chi2 | |
1336 | chamberId = trackParam->GetClusterPtr()->GetChamberId(); | |
1337 | detElemId = trackParam->GetClusterPtr()->GetDetElemId(); | |
b709ac13 | 1338 | |
1339 | // prepare nextTrackParam before adding new cluster because of the sorting | |
96ebe67e | 1340 | nextTrackParam = (AliMUONTrackParam*)track->GetTrackParamAtCluster()->After(trackParam); |
b709ac13 | 1341 | |
1342 | // recover track parameters from local fit and put them into a copy of trackParam | |
1343 | copyOfTrackParam.SetZ(trackParam->GetZ()); | |
1344 | copyOfTrackParam.SetParameters(trackParam->GetSmoothParameters()); | |
1345 | copyOfTrackParam.SetCovariances(trackParam->GetSmoothCovariances()); | |
1346 | ||
96ebe67e | 1347 | // Create iterators to loop over clusters in current chamber |
1348 | TIter nextInCh(clusterStore.CreateChamberIterator(chamberId,chamberId)); | |
1349 | ||
b709ac13 | 1350 | // look for one second candidate in the same chamber |
96ebe67e | 1351 | while ( ( cluster = static_cast<AliMUONVCluster*>(nextInCh()) ) ) { |
b709ac13 | 1352 | |
1353 | // look for a cluster in another detection element | |
96ebe67e | 1354 | if (cluster->GetDetElemId() == detElemId) continue; |
b709ac13 | 1355 | |
96ebe67e | 1356 | // try to add the current cluster fast |
1357 | if (!TryOneClusterFast(copyOfTrackParam, cluster)) continue; | |
b709ac13 | 1358 | |
96ebe67e | 1359 | // try to add the current cluster accurately |
1360 | chi2OfCluster = TryOneCluster(copyOfTrackParam, cluster, trackParamAtCluster); | |
b709ac13 | 1361 | |
1362 | // if better chi2 then prepare to add this cluster to the track | |
96ebe67e | 1363 | if (chi2OfCluster < bestChi2OfCluster) { |
1364 | bestChi2OfCluster = chi2OfCluster; | |
1365 | bestTrackParamAtCluster = trackParamAtCluster; | |
1366 | foundOneCluster = kTRUE; | |
b709ac13 | 1367 | } |
1368 | ||
1369 | } | |
1370 | ||
1371 | // add new cluster if any | |
96ebe67e | 1372 | if (foundOneCluster) { |
0e894e58 | 1373 | |
1374 | // Printout for debuging | |
1375 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
1376 | cout << "ComplementTracks: found one cluster in chamber(1..): " << chamberId+1 << endl; | |
1377 | bestTrackParamAtCluster.GetClusterPtr()->Print(); | |
1378 | cout<<endl<<"Track parameters and covariances at cluster:"<<endl; | |
1379 | bestTrackParamAtCluster.GetParameters().Print(); | |
1380 | bestTrackParamAtCluster.GetCovariances().Print(); | |
1381 | } | |
1382 | ||
7332f213 | 1383 | trackParam->SetRemovable(kTRUE); |
1384 | bestTrackParamAtCluster.SetRemovable(kTRUE); | |
1385 | track->AddTrackParamAtCluster(bestTrackParamAtCluster,*(bestTrackParamAtCluster.GetClusterPtr())); | |
b709ac13 | 1386 | trackModified = kTRUE; |
89c8d66d | 1387 | hasChanged = kTRUE; |
b709ac13 | 1388 | } |
1389 | ||
1390 | trackParam = nextTrackParam; | |
1391 | } | |
1392 | ||
1393 | // re-fit track parameters if needed | |
96ebe67e | 1394 | if (trackModified) Fit(*track, kTRUE, kFALSE, kTRUE); |
b709ac13 | 1395 | |
1396 | track = (AliMUONTrack*) fRecTracksPtr->After(track); | |
1397 | } | |
ea94c18b | 1398 | |
89c8d66d | 1399 | return hasChanged; |
1400 | ||
de2cd600 | 1401 | } |
1402 | ||
1403 | //__________________________________________________________________________ | |
7332f213 | 1404 | void AliMUONTrackReconstructor::ImproveTrack(AliMUONTrack &track) |
de2cd600 | 1405 | { |
7332f213 | 1406 | /// Improve the given track by removing clusters with local chi2 highter than the defined cut |
ea94c18b | 1407 | /// Recompute track parameters and covariances at the remaining clusters |
7332f213 | 1408 | AliDebug(1,"Enter ImproveTrack"); |
208f139e | 1409 | |
ea94c18b | 1410 | Double_t localChi2, worstLocalChi2; |
7332f213 | 1411 | AliMUONTrackParam *trackParamAtCluster, *worstTrackParamAtCluster; |
a0dc65b4 | 1412 | Double_t sigmaCut2 = GetRecoParam()->GetSigmaCutForImprovement() * |
1413 | GetRecoParam()->GetSigmaCutForImprovement(); | |
208f139e | 1414 | |
7332f213 | 1415 | while (!track.IsImproved()) { |
ea94c18b | 1416 | |
7332f213 | 1417 | // identify removable clusters |
a0dc65b4 | 1418 | track.TagRemovableClusters(GetRecoParam()->RequestedStationMask()); |
b709ac13 | 1419 | |
7332f213 | 1420 | // Update track parameters and covariances |
4ea3f013 | 1421 | if (!track.UpdateCovTrackParamAtCluster()) { |
1422 | AliWarning("unable to update track parameters and covariances --> stop improvement"); | |
1423 | break; | |
1424 | } | |
7332f213 | 1425 | |
1426 | // Compute local chi2 of each clusters | |
1427 | track.ComputeLocalChi2(kTRUE); | |
1428 | ||
1429 | // Look for the cluster to remove | |
1430 | worstTrackParamAtCluster = NULL; | |
1431 | worstLocalChi2 = 0.; | |
1432 | trackParamAtCluster = (AliMUONTrackParam*) track.GetTrackParamAtCluster()->First(); | |
1433 | while (trackParamAtCluster) { | |
ea94c18b | 1434 | |
7332f213 | 1435 | // Pick up cluster with the worst chi2 |
1436 | localChi2 = trackParamAtCluster->GetLocalChi2(); | |
1437 | if (localChi2 > worstLocalChi2) { | |
1438 | worstLocalChi2 = localChi2; | |
1439 | worstTrackParamAtCluster = trackParamAtCluster; | |
ea94c18b | 1440 | } |
1441 | ||
7332f213 | 1442 | trackParamAtCluster = (AliMUONTrackParam*) track.GetTrackParamAtCluster()->After(trackParamAtCluster); |
1443 | } | |
1444 | ||
1445 | // Check if worst cluster found | |
1446 | if (!worstTrackParamAtCluster) { | |
1447 | AliWarning("Bad local chi2 values?"); | |
1448 | break; | |
1449 | } | |
1450 | ||
1451 | // Check whether the worst chi2 is under requirement or not | |
1452 | if (worstLocalChi2 < 2. * sigmaCut2) { // 2 because 2 quantities in chi2 | |
1453 | track.SetImproved(kTRUE); | |
1454 | break; | |
1455 | } | |
1456 | ||
1457 | // if the worst cluster is not removable then stop improvement | |
1458 | if (!worstTrackParamAtCluster->IsRemovable()) break; | |
1459 | ||
1460 | // Remove the worst cluster | |
1461 | track.RemoveTrackParamAtCluster(worstTrackParamAtCluster); | |
1462 | ||
1463 | // Re-fit the track: | |
1464 | // Take into account the multiple scattering | |
1465 | // Calculate the track parameter covariance matrix | |
1466 | Fit(track, kTRUE, kFALSE, kTRUE); | |
1467 | ||
1468 | // Printout for debuging | |
1469 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
1470 | cout << "ImproveTracks: track " << fRecTracksPtr->IndexOf(&track)+1 << " improved " << endl; | |
de2cd600 | 1471 | } |
ea94c18b | 1472 | |
de2cd600 | 1473 | } |
1474 | ||
de2cd600 | 1475 | } |
1476 | ||
208f139e | 1477 | //__________________________________________________________________________ |
4ea3f013 | 1478 | Bool_t AliMUONTrackReconstructor::FinalizeTrack(AliMUONTrack &track) |
b8dc484b | 1479 | { |
7332f213 | 1480 | /// Recompute track parameters and covariances at each attached cluster |
1481 | /// from those at the first one, if not already done | |
1482 | AliDebug(1,"Enter FinalizeTrack"); | |
4ea3f013 | 1483 | if (!track.IsImproved() && !track.UpdateCovTrackParamAtCluster()) { |
1484 | AliWarning("finalization failed due to extrapolation problem"); | |
1485 | return kFALSE; | |
1486 | } | |
1487 | return kTRUE; | |
a9e2aefa | 1488 | } |
1489 | ||
9bf6860b | 1490 | //__________________________________________________________________________ |
b1fea02e | 1491 | Bool_t AliMUONTrackReconstructor::RefitTrack(AliMUONTrack &track, Bool_t enableImprovement) |
7deb8eb0 | 1492 | { |
1493 | /// re-fit the given track | |
1494 | ||
1495 | // check validity of the track | |
ad3c6eda | 1496 | if (track.GetNClusters() < 3) { |
7deb8eb0 | 1497 | AliWarning("the track does not contain enough clusters --> unable to refit"); |
1498 | return kFALSE; | |
1499 | } | |
1500 | ||
1501 | // reset the seed (i.e. parameters at first cluster) before fitting | |
1502 | AliMUONTrackParam* firstTrackParam = (AliMUONTrackParam*) track.GetTrackParamAtCluster()->First(); | |
1503 | if (firstTrackParam->GetInverseBendingMomentum() == 0.) { | |
1504 | AliWarning("track parameters at first chamber are not initialized --> unable to refit"); | |
1505 | return kFALSE; | |
1506 | } | |
1507 | ||
1508 | // compute track parameters at each cluster from parameters at the first one | |
1509 | // necessary to compute multiple scattering effect during refitting | |
4ea3f013 | 1510 | if (!track.UpdateTrackParamAtCluster()) { |
1511 | AliWarning("bad track refitting due to extrapolation failure"); | |
1512 | return kFALSE; | |
1513 | } | |
7deb8eb0 | 1514 | |
1515 | // Re-fit the track: | |
1516 | // Take into account the multiple scattering | |
1517 | // Calculate the track parameter covariance matrix | |
1518 | Fit(track, kTRUE, kFALSE, kTRUE); | |
1519 | ||
1520 | // Improve the reconstructed tracks if required | |
b1fea02e | 1521 | track.SetImproved(kFALSE); |
a0dc65b4 | 1522 | if (enableImprovement && GetRecoParam()->ImproveTracks()) ImproveTrack(track); |
7deb8eb0 | 1523 | |
1524 | // Fill AliMUONTrack data members | |
4ea3f013 | 1525 | if (track.GetGlobalChi2() < AliMUONTrack::MaxChi2()) return FinalizeTrack(track); |
1526 | else { | |
1527 | AliWarning("track not finalized due to extrapolation failure"); | |
1528 | return kFALSE; | |
1529 | } | |
7deb8eb0 | 1530 | |
1531 | } | |
1532 |