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8cc77df0 | 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 | //----------------------------------------------------------------------------- |
06ca6d7b | 19 | /// \class AliMUONTrackReconstructorK |
06ca6d7b | 20 | /// |
21 | /// MUON track reconstructor using the kalman method | |
22 | /// | |
23 | /// This class contains as data: | |
24 | /// - the parameters for the track reconstruction | |
25 | /// | |
26 | /// It contains as methods, among others: | |
27 | /// - MakeTracks to build the tracks | |
28 | /// | |
3d1463c8 | 29 | //----------------------------------------------------------------------------- |
8cc77df0 | 30 | |
8cc77df0 | 31 | #include "AliMUONTrackReconstructorK.h" |
96ebe67e | 32 | |
8cc77df0 | 33 | #include "AliMUONConstants.h" |
96ebe67e | 34 | #include "AliMUONVCluster.h" |
1fef78c8 | 35 | #include "AliMUONVClusterServer.h" |
96ebe67e | 36 | #include "AliMUONVClusterStore.h" |
ea94c18b | 37 | #include "AliMUONTrack.h" |
38 | #include "AliMUONTrackParam.h" | |
39 | #include "AliMUONTrackExtrap.h" | |
5a240757 | 40 | #include "AliMUONRecoParam.h" |
8cde4af5 | 41 | |
1fef78c8 | 42 | #include "AliMpArea.h" |
43 | ||
8cc77df0 | 44 | #include "AliLog.h" |
45 | ||
8cde4af5 | 46 | #include <Riostream.h> |
ea94c18b | 47 | #include <TMath.h> |
48 | #include <TMatrixD.h> | |
ce8cd162 | 49 | #include <TClonesArray.h> |
8cde4af5 | 50 | |
51 | /// \cond CLASSIMP | |
8cc77df0 | 52 | ClassImp(AliMUONTrackReconstructorK) // Class implementation in ROOT context |
8cde4af5 | 53 | /// \endcond |
8cc77df0 | 54 | |
019df241 | 55 | //__________________________________________________________________________ |
a0dc65b4 | 56 | AliMUONTrackReconstructorK::AliMUONTrackReconstructorK(const AliMUONRecoParam* recoParam, AliMUONVClusterServer* clusterServer) |
57 | : AliMUONVTrackReconstructor(recoParam, clusterServer) | |
8cc77df0 | 58 | { |
96ebe67e | 59 | /// Constructor |
8cc77df0 | 60 | } |
61 | ||
019df241 | 62 | //__________________________________________________________________________ |
ea94c18b | 63 | AliMUONTrackReconstructorK::~AliMUONTrackReconstructorK() |
8cc77df0 | 64 | { |
ea94c18b | 65 | /// Destructor |
66 | } | |
8cc77df0 | 67 | |
68 | //__________________________________________________________________________ | |
89c8d66d | 69 | Bool_t AliMUONTrackReconstructorK::MakeTrackCandidates(AliMUONVClusterStore& clusterStore) |
8cc77df0 | 70 | { |
89c8d66d | 71 | /// To make track candidates (assuming linear propagation if AliMUONRecoParam::MakeTrackCandidatesFast() return kTRUE): |
ea94c18b | 72 | /// Start with segments station(1..) 4 or 5 then follow track in station 5 or 4. |
89c8d66d | 73 | /// Good candidates are made of at least three clusters if both stations are requested (two otherwise). |
74 | /// Keep only best candidates or all of them according to the flag AliMUONRecoParam::TrackAllTracks(). | |
b709ac13 | 75 | |
208f139e | 76 | TClonesArray *segments; |
89c8d66d | 77 | AliMUONObjectPair *segment; |
ea94c18b | 78 | AliMUONTrack *track; |
79 | Int_t iCandidate = 0; | |
96ebe67e | 80 | Bool_t clusterFound; |
8cc77df0 | 81 | |
ea94c18b | 82 | AliDebug(1,"Enter MakeTrackCandidates"); |
8cc77df0 | 83 | |
1fef78c8 | 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()) { |
1fef78c8 | 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 | ||
ea94c18b | 99 | // Loop over stations(1..) 5 and 4 and make track candidates |
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 | |
105 | // Loop over segments | |
89c8d66d | 106 | for (Int_t iSegment=0; iSegment<segments->GetEntriesFast(); iSegment++) { |
ea94c18b | 107 | AliDebug(1,Form("Making primary candidate(1..) %d",++iCandidate)); |
89c8d66d | 108 | segment = (AliMUONObjectPair*) segments->UncheckedAt(iSegment); |
ea94c18b | 109 | |
110 | // Transform segments to tracks and put them at the end of fRecTracksPtr | |
89c8d66d | 111 | track = new ((*fRecTracksPtr)[fRecTracksPtr->GetLast()+1]) AliMUONTrack(segment,GetRecoParam()->GetBendingVertexDispersion()); |
ea94c18b | 112 | fNRecTracks++; |
113 | ||
96ebe67e | 114 | // Look for compatible cluster(s) in the other station |
89c8d66d | 115 | if (GetRecoParam()->MakeTrackCandidatesFast()) clusterFound = FollowLinearTrackInStation(*track, clusterStore, 7-istat); |
116 | else clusterFound = FollowTrackInStation(*track, clusterStore, 7-istat); | |
019df241 | 117 | |
9bf6860b | 118 | // Remove track if no cluster found on a requested station |
89c8d66d | 119 | // or abort tracking if there are too many candidates |
6b191dea | 120 | if (GetRecoParam()->RequestStation(7-istat)) { |
121 | if (!clusterFound) { | |
122 | fRecTracksPtr->Remove(track); | |
123 | fNRecTracks--; | |
124 | } else if (fNRecTracks > GetRecoParam()->GetMaxTrackCandidates()) { | |
87976389 | 125 | AliError(Form("Too many track candidates (%d tracks). Stop tracking.", fNRecTracks)); |
6b191dea | 126 | return kFALSE; |
127 | } | |
128 | } else { | |
129 | if ((fNRecTracks + segments->GetEntriesFast() - iSegment - 1) > GetRecoParam()->GetMaxTrackCandidates()) { | |
4ea3f013 | 130 | AliError(Form("Too many track candidates (%d tracks). Stop tracking.", fNRecTracks + segments->GetEntriesFast() - iSegment - 1)); |
6b191dea | 131 | return kFALSE; |
132 | } | |
ea94c18b | 133 | } |
134 | ||
135 | } | |
89c8d66d | 136 | |
ea94c18b | 137 | } |
138 | ||
89c8d66d | 139 | // Keep all different tracks if required |
140 | if (GetRecoParam()->TrackAllTracks()) RemoveIdenticalTracks(); | |
ea94c18b | 141 | |
89c8d66d | 142 | // Retrace tracks using Kalman filter and select them if needed |
143 | Int_t nCurrentTracks = fRecTracksPtr->GetLast()+1; | |
144 | for (Int_t iRecTrack = 0; iRecTrack < nCurrentTracks; iRecTrack++) { | |
145 | track = (AliMUONTrack*) fRecTracksPtr->UncheckedAt(iRecTrack); | |
ea94c18b | 146 | |
89c8d66d | 147 | // skip empty slots |
148 | if(!track) continue; | |
149 | ||
4ea3f013 | 150 | // retrace tracks using Kalman filter and remove the ones for which extrap failed or that are out of limits |
151 | if (!RetraceTrack(*track,kTRUE) || !IsAcceptable(*((AliMUONTrackParam*)track->GetTrackParamAtCluster()->First()))) { | |
6b191dea | 152 | fRecTracksPtr->Remove(track); |
153 | fNRecTracks--; | |
ea94c18b | 154 | } |
155 | ||
156 | } | |
157 | ||
89c8d66d | 158 | // Keep only the best tracks if required |
159 | if (!GetRecoParam()->TrackAllTracks()) RemoveDoubleTracks(); | |
3e9a7a05 | 160 | else fRecTracksPtr->Compress(); |
ea94c18b | 161 | |
162 | AliDebug(1,Form("Number of good candidates = %d",fNRecTracks)); | |
163 | ||
89c8d66d | 164 | return kTRUE; |
165 | ||
9bf6860b | 166 | } |
167 | ||
168 | //__________________________________________________________________________ | |
89c8d66d | 169 | Bool_t AliMUONTrackReconstructorK::MakeMoreTrackCandidates(AliMUONVClusterStore& clusterStore) |
9bf6860b | 170 | { |
89c8d66d | 171 | /// To make extra track candidates assuming linear propagation: |
9bf6860b | 172 | /// clustering is supposed to be already done |
173 | /// Start with segments made of 1 cluster in each of the stations 4 and 5 then follow track in remaining chambers. | |
89c8d66d | 174 | /// Good candidates are made of at least three clusters if both stations are requested (two otherwise). |
9bf6860b | 175 | /// Keep only best candidates or all of them according to the flag fgkTrackAllTracks. |
176 | ||
177 | TClonesArray *segments; | |
89c8d66d | 178 | AliMUONObjectPair *segment; |
9bf6860b | 179 | AliMUONTrack *track; |
180 | Int_t iCandidate = 0, iCurrentTrack, nCurrentTracks; | |
181 | Int_t initialNRecTracks = fNRecTracks; | |
182 | Bool_t clusterFound; | |
183 | ||
184 | AliDebug(1,"Enter MakeMoreTrackCandidates"); | |
185 | ||
186 | // Double loop over chambers in stations(1..) 4 and 5 to make track candidates | |
187 | for (Int_t ich1 = 6; ich1 <= 7; ich1++) { | |
188 | for (Int_t ich2 = 8; ich2 <= 9; ich2++) { | |
189 | ||
190 | // Make segments between ch1 and ch2 | |
191 | segments = MakeSegmentsBetweenChambers(clusterStore, ich1, ich2); | |
192 | ||
89c8d66d | 193 | /// Remove segments already attached to a track |
194 | RemoveUsedSegments(*segments); | |
195 | ||
9bf6860b | 196 | // Loop over segments |
89c8d66d | 197 | for (Int_t iSegment=0; iSegment<segments->GetEntriesFast(); iSegment++) { |
9bf6860b | 198 | AliDebug(1,Form("Making primary candidate(1..) %d",++iCandidate)); |
89c8d66d | 199 | segment = (AliMUONObjectPair*) segments->UncheckedAt(iSegment); |
9bf6860b | 200 | |
201 | // Transform segments to tracks and put them at the end of fRecTracksPtr | |
202 | iCurrentTrack = fRecTracksPtr->GetLast()+1; | |
89c8d66d | 203 | track = new ((*fRecTracksPtr)[iCurrentTrack]) AliMUONTrack(segment,GetRecoParam()->GetBendingVertexDispersion()); |
9bf6860b | 204 | fNRecTracks++; |
205 | ||
206 | // Look for compatible cluster(s) in the second chamber of station 5 | |
89c8d66d | 207 | clusterFound = FollowLinearTrackInChamber(*track, clusterStore, 17-ich2); |
9bf6860b | 208 | |
209 | // skip the original track in case it has been removed | |
a0dc65b4 | 210 | if (GetRecoParam()->TrackAllTracks() && clusterFound) iCurrentTrack++; |
9bf6860b | 211 | |
212 | // loop over every new tracks | |
213 | nCurrentTracks = fRecTracksPtr->GetLast()+1; | |
214 | while (iCurrentTrack < nCurrentTracks) { | |
215 | track = (AliMUONTrack*) fRecTracksPtr->UncheckedAt(iCurrentTrack); | |
216 | ||
217 | // Look for compatible cluster(s) in the second chamber of station 4 | |
89c8d66d | 218 | FollowLinearTrackInChamber(*track, clusterStore, 13-ich1); |
9bf6860b | 219 | |
220 | iCurrentTrack++; | |
221 | } | |
222 | ||
89c8d66d | 223 | // abort tracking if there are too many candidates |
6b191dea | 224 | if ((fNRecTracks + segments->GetEntriesFast() - iSegment - 1) > GetRecoParam()->GetMaxTrackCandidates()) { |
87976389 | 225 | AliError(Form("Too many track candidates (%d tracks). Stop tracking.", fNRecTracks + segments->GetEntriesFast() - iSegment - 1)); |
89c8d66d | 226 | return kFALSE; |
227 | } | |
228 | ||
9bf6860b | 229 | } |
230 | ||
9bf6860b | 231 | } |
232 | } | |
233 | ||
89c8d66d | 234 | // Retrace tracks using Kalman filter (also compute track chi2) and select them |
235 | nCurrentTracks = fRecTracksPtr->GetLast()+1; | |
236 | for (Int_t iRecTrack = initialNRecTracks; iRecTrack < nCurrentTracks; iRecTrack++) { | |
9bf6860b | 237 | track = (AliMUONTrack*) fRecTracksPtr->UncheckedAt(iRecTrack); |
238 | ||
89c8d66d | 239 | // skip empty slots |
240 | if(!track) continue; | |
241 | ||
4ea3f013 | 242 | // retrace tracks using Kalman filter and remove the ones for which extrap failed or that are out of limits |
243 | if (!RetraceTrack(*track,kTRUE) || !IsAcceptable(*((AliMUONTrackParam*)track->GetTrackParamAtCluster()->First()))) { | |
6b191dea | 244 | fRecTracksPtr->Remove(track); |
245 | fNRecTracks--; | |
9bf6860b | 246 | } |
247 | ||
248 | } | |
249 | ||
89c8d66d | 250 | // Keep only the best tracks if required |
251 | if (!GetRecoParam()->TrackAllTracks()) RemoveDoubleTracks(); | |
252 | else fRecTracksPtr->Compress(); | |
9bf6860b | 253 | |
254 | AliDebug(1,Form("Number of good candidates = %d",fNRecTracks)); | |
255 | ||
89c8d66d | 256 | return kTRUE; |
257 | ||
8cc77df0 | 258 | } |
259 | ||
ea94c18b | 260 | //__________________________________________________________________________ |
4ea3f013 | 261 | Bool_t AliMUONTrackReconstructorK::RetraceTrack(AliMUONTrack &trackCandidate, Bool_t resetSeed) |
8cc77df0 | 262 | { |
96ebe67e | 263 | /// Re-run the kalman filter from the most downstream cluster to the most uptream one |
4ea3f013 | 264 | /// Return kFALSE in case of failure (i.e. extrapolation problem) |
ea94c18b | 265 | AliDebug(1,"Enter RetraceTrack"); |
266 | ||
7332f213 | 267 | AliMUONTrackParam* lastTrackParam = (AliMUONTrackParam*) trackCandidate.GetTrackParamAtCluster()->Last(); |
ea94c18b | 268 | |
96ebe67e | 269 | // Reset the "seed" (= track parameters and their covariances at last cluster) if required |
ea94c18b | 270 | if (resetSeed) { |
7332f213 | 271 | |
272 | // parameters at last cluster | |
273 | AliMUONVCluster* cluster2 = lastTrackParam->GetClusterPtr(); | |
274 | Double_t x2 = cluster2->GetX(); | |
275 | Double_t y2 = cluster2->GetY(); | |
276 | Double_t z2 = cluster2->GetZ(); | |
277 | ||
278 | // parameters at last but one cluster | |
279 | AliMUONTrackParam* previousTrackParam = (AliMUONTrackParam*) trackCandidate.GetTrackParamAtCluster()->Before(lastTrackParam); | |
280 | AliMUONVCluster* cluster1 = previousTrackParam->GetClusterPtr(); | |
0e894e58 | 281 | // make sure it is on the previous chamber (can have 2 clusters in the same chamber after "ComplementTrack") |
282 | if (cluster2->GetChamberId() == cluster1->GetChamberId()) { | |
283 | previousTrackParam = (AliMUONTrackParam*) trackCandidate.GetTrackParamAtCluster()->Before(previousTrackParam); | |
284 | cluster1 = previousTrackParam->GetClusterPtr(); | |
285 | } | |
7332f213 | 286 | Double_t x1 = cluster1->GetX(); |
287 | Double_t y1 = cluster1->GetY(); | |
288 | Double_t z1 = cluster1->GetZ(); | |
289 | ||
290 | // reset track parameters | |
291 | Double_t dZ = z1 - z2; | |
292 | lastTrackParam->SetNonBendingCoor(x2); | |
293 | lastTrackParam->SetBendingCoor(y2); | |
294 | lastTrackParam->SetZ(z2); | |
295 | lastTrackParam->SetNonBendingSlope((x1 - x2) / dZ); | |
296 | lastTrackParam->SetBendingSlope((y1 - y2) / dZ); | |
297 | Double_t bendingImpact = y2 - z2 * lastTrackParam->GetBendingSlope(); | |
9bf6860b | 298 | Double_t inverseBendingMomentum = 1. / AliMUONTrackExtrap::GetBendingMomentumFromImpactParam(bendingImpact); |
299 | lastTrackParam->SetInverseBendingMomentum(inverseBendingMomentum); | |
7332f213 | 300 | |
301 | // => Reset track parameter covariances at last cluster (as if the other clusters did not exist) | |
302 | TMatrixD lastParamCov(5,5); | |
303 | lastParamCov.Zero(); | |
ea94c18b | 304 | // Non bending plane |
7332f213 | 305 | lastParamCov(0,0) = cluster2->GetErrX2(); |
89c8d66d | 306 | lastParamCov(0,1) = - cluster2->GetErrX2() / dZ; |
307 | lastParamCov(1,0) = lastParamCov(0,1); | |
308 | lastParamCov(1,1) = ( 1000. * cluster1->GetErrX2() + cluster2->GetErrX2() ) / dZ / dZ; | |
ea94c18b | 309 | // Bending plane |
7332f213 | 310 | lastParamCov(2,2) = cluster2->GetErrY2(); |
89c8d66d | 311 | lastParamCov(2,3) = - cluster2->GetErrY2() / dZ; |
312 | lastParamCov(3,2) = lastParamCov(2,3); | |
313 | lastParamCov(3,3) = ( 1000. * cluster1->GetErrY2() + cluster2->GetErrY2() ) / dZ / dZ; | |
9bf6860b | 314 | // Inverse bending momentum (vertex resolution + bending slope resolution + 10% error on dipole parameters+field) |
89c8d66d | 315 | if (AliMUONTrackExtrap::IsFieldON()) { |
316 | lastParamCov(4,4) = ((GetRecoParam()->GetBendingVertexDispersion() * | |
317 | GetRecoParam()->GetBendingVertexDispersion() + | |
318 | (z1 * z1 * cluster2->GetErrY2() + z2 * z2 * 1000. * cluster1->GetErrY2()) / dZ / dZ) / | |
319 | bendingImpact / bendingImpact + 0.1 * 0.1) * inverseBendingMomentum * inverseBendingMomentum; | |
320 | lastParamCov(2,4) = z1 * cluster2->GetErrY2() * inverseBendingMomentum / bendingImpact / dZ; | |
321 | lastParamCov(4,2) = lastParamCov(2,4); | |
322 | lastParamCov(3,4) = - (z1 * cluster2->GetErrY2() + z2 * 1000. * cluster1->GetErrY2()) * | |
323 | inverseBendingMomentum / bendingImpact / dZ / dZ; | |
324 | lastParamCov(4,3) = lastParamCov(3,4); | |
325 | } else lastParamCov(4,4) = inverseBendingMomentum*inverseBendingMomentum; | |
7332f213 | 326 | lastTrackParam->SetCovariances(lastParamCov); |
ea94c18b | 327 | |
328 | // Reset the track chi2 | |
7332f213 | 329 | lastTrackParam->SetTrackChi2(0.); |
ea94c18b | 330 | |
331 | } | |
332 | ||
333 | // Redo the tracking | |
4ea3f013 | 334 | return RetracePartialTrack(trackCandidate, lastTrackParam); |
ea94c18b | 335 | |
336 | } | |
8cc77df0 | 337 | |
ea94c18b | 338 | //__________________________________________________________________________ |
4ea3f013 | 339 | Bool_t AliMUONTrackReconstructorK::RetracePartialTrack(AliMUONTrack &trackCandidate, const AliMUONTrackParam* startingTrackParam) |
ea94c18b | 340 | { |
96ebe67e | 341 | /// Re-run the kalman filter from the cluster attached to startingTrackParam to the most uptream cluster |
4ea3f013 | 342 | /// Return kFALSE in case of failure (i.e. extrapolation problem) |
ea94c18b | 343 | AliDebug(1,"Enter RetracePartialTrack"); |
344 | ||
345 | // Printout for debuging | |
346 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
96ebe67e | 347 | cout << "RetracePartialTrack: track chi2 before re-tracking: " << trackCandidate.GetGlobalChi2() << endl; |
ea94c18b | 348 | } |
349 | ||
350 | // Reset the track chi2 | |
96ebe67e | 351 | trackCandidate.SetGlobalChi2(startingTrackParam->GetTrackChi2()); |
ea94c18b | 352 | |
96ebe67e | 353 | // loop over attached clusters until the first one and recompute track parameters and covariances using kalman filter |
4ea3f013 | 354 | Bool_t extrapStatus = kTRUE; |
96ebe67e | 355 | Int_t expectedChamber = startingTrackParam->GetClusterPtr()->GetChamberId() - 1; |
ea94c18b | 356 | Int_t currentChamber; |
96ebe67e | 357 | Double_t addChi2TrackAtCluster; |
358 | AliMUONTrackParam* trackParamAtCluster = (AliMUONTrackParam*) trackCandidate.GetTrackParamAtCluster()->Before(startingTrackParam); | |
359 | while (trackParamAtCluster) { | |
ea94c18b | 360 | |
361 | // reset track parameters and their covariances | |
96ebe67e | 362 | trackParamAtCluster->SetParameters(startingTrackParam->GetParameters()); |
363 | trackParamAtCluster->SetZ(startingTrackParam->GetZ()); | |
364 | trackParamAtCluster->SetCovariances(startingTrackParam->GetCovariances()); | |
ea94c18b | 365 | |
366 | // add MCS effect | |
4663da9f | 367 | AliMUONTrackExtrap::AddMCSEffect(trackParamAtCluster,AliMUONConstants::ChamberThicknessInX0(expectedChamber+1),-1.); |
ea94c18b | 368 | |
369 | // reset propagator for smoother | |
a0dc65b4 | 370 | if (GetRecoParam()->UseSmoother()) trackParamAtCluster->ResetPropagator(); |
ea94c18b | 371 | |
9bf6860b | 372 | // add MCS in missing chambers if any |
96ebe67e | 373 | currentChamber = trackParamAtCluster->GetClusterPtr()->GetChamberId(); |
ea94c18b | 374 | while (currentChamber < expectedChamber) { |
375 | // extrapolation to the missing chamber (update the propagator) | |
4ea3f013 | 376 | if (!AliMUONTrackExtrap::ExtrapToZCov(trackParamAtCluster, AliMUONConstants::DefaultChamberZ(expectedChamber), |
377 | GetRecoParam()->UseSmoother())) extrapStatus = kFALSE; | |
ea94c18b | 378 | // add MCS effect |
4663da9f | 379 | AliMUONTrackExtrap::AddMCSEffect(trackParamAtCluster,AliMUONConstants::ChamberThicknessInX0(expectedChamber),-1.); |
ea94c18b | 380 | expectedChamber--; |
381 | } | |
382 | ||
96ebe67e | 383 | // extrapolation to the plane of the cluster attached to the current trackParamAtCluster (update the propagator) |
4ea3f013 | 384 | if (!AliMUONTrackExtrap::ExtrapToZCov(trackParamAtCluster, trackParamAtCluster->GetClusterPtr()->GetZ(), |
385 | GetRecoParam()->UseSmoother())) extrapStatus = kFALSE; | |
ea94c18b | 386 | |
a0dc65b4 | 387 | if (GetRecoParam()->UseSmoother()) { |
ea94c18b | 388 | // save extrapolated parameters for smoother |
96ebe67e | 389 | trackParamAtCluster->SetExtrapParameters(trackParamAtCluster->GetParameters()); |
ea94c18b | 390 | |
391 | // save extrapolated covariance matrix for smoother | |
96ebe67e | 392 | trackParamAtCluster->SetExtrapCovariances(trackParamAtCluster->GetCovariances()); |
ea94c18b | 393 | } |
394 | ||
9bf6860b | 395 | // Compute new track parameters using kalman filter |
96ebe67e | 396 | addChi2TrackAtCluster = RunKalmanFilter(*trackParamAtCluster); |
ea94c18b | 397 | |
398 | // Update the track chi2 | |
96ebe67e | 399 | trackCandidate.SetGlobalChi2(trackCandidate.GetGlobalChi2() + addChi2TrackAtCluster); |
400 | trackParamAtCluster->SetTrackChi2(trackCandidate.GetGlobalChi2()); | |
ea94c18b | 401 | |
96ebe67e | 402 | // prepare next step |
403 | expectedChamber = currentChamber - 1; | |
404 | startingTrackParam = trackParamAtCluster; | |
405 | trackParamAtCluster = (AliMUONTrackParam*) (trackCandidate.GetTrackParamAtCluster()->Before(startingTrackParam)); | |
ea94c18b | 406 | } |
407 | ||
408 | // Printout for debuging | |
409 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
96ebe67e | 410 | cout << "RetracePartialTrack: track chi2 after re-tracking: " << trackCandidate.GetGlobalChi2() << endl; |
ea94c18b | 411 | } |
412 | ||
4ea3f013 | 413 | // set global chi2 to max value in case of problem during track extrapolation |
414 | if (!extrapStatus) trackCandidate.SetGlobalChi2(2.*AliMUONTrack::MaxChi2()); | |
415 | return extrapStatus; | |
416 | ||
ea94c18b | 417 | } |
8cc77df0 | 418 | |
ea94c18b | 419 | //__________________________________________________________________________ |
89c8d66d | 420 | Bool_t AliMUONTrackReconstructorK::FollowTracks(AliMUONVClusterStore& clusterStore) |
ea94c18b | 421 | { |
422 | /// Follow tracks in stations(1..) 3, 2 and 1 | |
423 | AliDebug(1,"Enter FollowTracks"); | |
424 | ||
425 | AliMUONTrack *track; | |
426 | Int_t currentNRecTracks; | |
ea94c18b | 427 | |
428 | for (Int_t station = 2; station >= 0; station--) { | |
429 | ||
430 | // Save the actual number of reconstructed track in case of | |
431 | // tracks are added or suppressed during the tracking procedure | |
432 | // !! Do not compress fRecTracksPtr until the end of the loop over tracks !! | |
433 | currentNRecTracks = fNRecTracks; | |
434 | ||
435 | for (Int_t iRecTrack = 0; iRecTrack <currentNRecTracks; iRecTrack++) { | |
436 | AliDebug(1,Form("FollowTracks: track candidate(1..) %d", iRecTrack+1)); | |
437 | ||
438 | track = (AliMUONTrack*) fRecTracksPtr->UncheckedAt(iRecTrack); | |
439 | ||
96ebe67e | 440 | // Look for compatible cluster(s) in station(0..) "station" |
9bf6860b | 441 | if (!FollowTrackInStation(*track, clusterStore, station)) { |
442 | ||
443 | // Try to recover track if required | |
a0dc65b4 | 444 | if (GetRecoParam()->RecoverTracks()) { |
9bf6860b | 445 | |
446 | // work on a copy of the track if this station is not required | |
447 | // to keep the case where no cluster is reconstructed as a possible candidate | |
a0dc65b4 | 448 | if (!GetRecoParam()->RequestStation(station)) { |
9bf6860b | 449 | track = new ((*fRecTracksPtr)[fRecTracksPtr->GetLast()+1]) AliMUONTrack(*track); |
450 | fNRecTracks++; | |
451 | } | |
452 | ||
453 | // try to recover | |
454 | if (!RecoverTrack(*track, clusterStore, station)) { | |
455 | // remove track if no cluster found | |
456 | fRecTracksPtr->Remove(track); | |
457 | fNRecTracks--; | |
458 | } | |
459 | ||
a0dc65b4 | 460 | } else if (GetRecoParam()->RequestStation(station)) { |
9bf6860b | 461 | // remove track if no cluster found |
462 | fRecTracksPtr->Remove(track); | |
463 | fNRecTracks--; | |
464 | } | |
465 | ||
8cc77df0 | 466 | } |
ea94c18b | 467 | |
89c8d66d | 468 | // abort tracking if there are too many candidates |
6b191dea | 469 | if (GetRecoParam()->RequestStation(station)) { |
470 | if (fNRecTracks > GetRecoParam()->GetMaxTrackCandidates()) { | |
87976389 | 471 | AliError(Form("Too many track candidates (%d tracks). Stop tracking.", fNRecTracks)); |
6b191dea | 472 | return kFALSE; |
473 | } | |
474 | } else { | |
475 | if ((fNRecTracks + currentNRecTracks - iRecTrack - 1) > GetRecoParam()->GetMaxTrackCandidates()) { | |
87976389 | 476 | AliError(Form("Too many track candidates (%d tracks). Stop tracking.", fNRecTracks + currentNRecTracks - iRecTrack - 1)); |
6b191dea | 477 | return kFALSE; |
478 | } | |
89c8d66d | 479 | } |
480 | ||
8cc77df0 | 481 | } |
ea94c18b | 482 | |
483 | fRecTracksPtr->Compress(); // this is essential before checking tracks | |
484 | ||
ea94c18b | 485 | // Keep only the best tracks if required |
a0dc65b4 | 486 | if (!GetRecoParam()->TrackAllTracks()) RemoveDoubleTracks(); |
ea94c18b | 487 | |
488 | } | |
489 | ||
89c8d66d | 490 | return kTRUE; |
491 | ||
9bf6860b | 492 | } |
493 | ||
494 | //__________________________________________________________________________ | |
495 | Bool_t AliMUONTrackReconstructorK::FollowTrackInChamber(AliMUONTrack &trackCandidate, AliMUONVClusterStore& clusterStore, Int_t nextChamber) | |
496 | { | |
497 | /// Follow trackCandidate in chamber(0..) nextChamber and search for compatible cluster(s) | |
498 | /// Keep all possibilities or only the best one(s) according to the flag fgkTrackAllTracks: | |
499 | /// kTRUE: duplicate "trackCandidate" if there are several possibilities and add the new tracks at the end of | |
500 | /// fRecTracksPtr to avoid conficts with other track candidates at this current stage of the tracking procedure. | |
501 | /// Remove the obsolete "trackCandidate" at the end. | |
502 | /// kFALSE: add only the best cluster(s) to the "trackCandidate". Try to add a couple of clusters in priority. | |
503 | /// return kTRUE if new cluster(s) have been found (otherwise return kFALSE) | |
504 | AliDebug(1,Form("Enter FollowTrackInChamber(1..) %d", nextChamber+1)); | |
505 | ||
9bf6860b | 506 | Double_t chi2OfCluster; |
a0dc65b4 | 507 | Double_t maxChi2OfCluster = 2. * GetRecoParam()->GetSigmaCutForTracking() * |
508 | GetRecoParam()->GetSigmaCutForTracking(); // 2 because 2 quantities in chi2 | |
9bf6860b | 509 | Double_t addChi2TrackAtCluster; |
4ea3f013 | 510 | Double_t bestAddChi2TrackAtCluster = AliMUONTrack::MaxChi2(); |
9bf6860b | 511 | Bool_t foundOneCluster = kFALSE; |
512 | AliMUONTrack *newTrack = 0x0; | |
513 | AliMUONVCluster *cluster; | |
514 | AliMUONTrackParam extrapTrackParamAtCh; | |
515 | AliMUONTrackParam extrapTrackParamAtCluster; | |
516 | AliMUONTrackParam bestTrackParamAtCluster; | |
517 | ||
518 | // Get track parameters according to the propagation direction | |
519 | if (nextChamber > 7) extrapTrackParamAtCh = *(AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->Last(); | |
520 | else extrapTrackParamAtCh = *(AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->First(); | |
521 | ||
522 | // Printout for debuging | |
523 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 2) || (AliLog::GetGlobalDebugLevel() >= 2)) { | |
524 | cout<<endl<<"Track parameters and covariances at first cluster:"<<endl; | |
525 | extrapTrackParamAtCh.GetParameters().Print(); | |
526 | extrapTrackParamAtCh.GetCovariances().Print(); | |
527 | } | |
528 | ||
529 | // Add MCS effect | |
4663da9f | 530 | Int_t currentChamber = extrapTrackParamAtCh.GetClusterPtr()->GetChamberId(); |
531 | AliMUONTrackExtrap::AddMCSEffect(&extrapTrackParamAtCh,AliMUONConstants::ChamberThicknessInX0(currentChamber),-1.); | |
9bf6860b | 532 | |
533 | // reset propagator for smoother | |
a0dc65b4 | 534 | if (GetRecoParam()->UseSmoother()) extrapTrackParamAtCh.ResetPropagator(); |
9bf6860b | 535 | |
536 | // Add MCS in the missing chamber(s) if any | |
9bf6860b | 537 | while (currentChamber > nextChamber + 1) { |
538 | // extrapolation to the missing chamber | |
539 | currentChamber--; | |
4ea3f013 | 540 | if (!AliMUONTrackExtrap::ExtrapToZCov(&extrapTrackParamAtCh, AliMUONConstants::DefaultChamberZ(currentChamber), |
541 | GetRecoParam()->UseSmoother())) return kFALSE; | |
9bf6860b | 542 | // add MCS effect |
4663da9f | 543 | AliMUONTrackExtrap::AddMCSEffect(&extrapTrackParamAtCh,AliMUONConstants::ChamberThicknessInX0(currentChamber),-1.); |
9bf6860b | 544 | } |
545 | ||
546 | //Extrapolate trackCandidate to chamber | |
4ea3f013 | 547 | if (!AliMUONTrackExtrap::ExtrapToZCov(&extrapTrackParamAtCh, AliMUONConstants::DefaultChamberZ(nextChamber), |
548 | GetRecoParam()->UseSmoother())) return kFALSE; | |
9bf6860b | 549 | |
550 | // Printout for debuging | |
551 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 2) || (AliLog::GetGlobalDebugLevel() >= 2)) { | |
552 | cout<<endl<<"Track parameters and covariances at first cluster extrapolated to z = "<<AliMUONConstants::DefaultChamberZ(nextChamber)<<":"<<endl; | |
553 | extrapTrackParamAtCh.GetParameters().Print(); | |
554 | extrapTrackParamAtCh.GetCovariances().Print(); | |
555 | } | |
556 | ||
557 | // Printout for debuging | |
558 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
559 | cout << "FollowTrackInChamber: look for clusters in chamber(1..): " << nextChamber+1 << endl; | |
560 | } | |
561 | ||
562 | // Ask the clustering to reconstruct new clusters around the track position in the current chamber | |
563 | // except for station 4 and 5 that are already entirely clusterized | |
a0dc65b4 | 564 | if (GetRecoParam()->CombineClusterTrackReco()) { |
9bf6860b | 565 | if (nextChamber < 6) AskForNewClustersInChamber(extrapTrackParamAtCh, clusterStore, nextChamber); |
566 | } | |
567 | ||
568 | // Create iterators to loop over clusters in both chambers | |
569 | TIter next(clusterStore.CreateChamberIterator(nextChamber,nextChamber)); | |
570 | ||
571 | // look for candidates in chamber | |
572 | while ( ( cluster = static_cast<AliMUONVCluster*>(next()) ) ) { | |
573 | ||
574 | // try to add the current cluster fast | |
575 | if (!TryOneClusterFast(extrapTrackParamAtCh, cluster)) continue; | |
576 | ||
577 | // try to add the current cluster accuratly | |
578 | chi2OfCluster = TryOneCluster(extrapTrackParamAtCh, cluster, extrapTrackParamAtCluster, | |
a0dc65b4 | 579 | GetRecoParam()->UseSmoother()); |
9bf6860b | 580 | |
581 | // if good chi2 then consider to add cluster | |
582 | if (chi2OfCluster < maxChi2OfCluster) { | |
9bf6860b | 583 | |
a0dc65b4 | 584 | if (GetRecoParam()->UseSmoother()) { |
9bf6860b | 585 | // save extrapolated parameters for smoother |
586 | extrapTrackParamAtCluster.SetExtrapParameters(extrapTrackParamAtCluster.GetParameters()); | |
587 | ||
588 | // save extrapolated covariance matrix for smoother | |
589 | extrapTrackParamAtCluster.SetExtrapCovariances(extrapTrackParamAtCluster.GetCovariances()); | |
590 | } | |
591 | ||
592 | // Compute new track parameters including new cluster using kalman filter | |
593 | addChi2TrackAtCluster = RunKalmanFilter(extrapTrackParamAtCluster); | |
594 | ||
6b191dea | 595 | // skip track out of limits |
596 | if (!IsAcceptable(extrapTrackParamAtCluster)) continue; | |
89c8d66d | 597 | |
598 | // remember a cluster was found | |
599 | foundOneCluster = kTRUE; | |
600 | ||
601 | // Printout for debuging | |
602 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
603 | cout << "FollowTrackInChamber: found one cluster in chamber(1..): " << nextChamber+1 | |
604 | << " (Chi2 = " << chi2OfCluster << ")" << endl; | |
605 | cluster->Print(); | |
606 | } | |
9bf6860b | 607 | |
a0dc65b4 | 608 | if (GetRecoParam()->TrackAllTracks()) { |
9bf6860b | 609 | // copy trackCandidate into a new track put at the end of fRecTracksPtr and add the new cluster |
610 | newTrack = new ((*fRecTracksPtr)[fRecTracksPtr->GetLast()+1]) AliMUONTrack(trackCandidate); | |
611 | UpdateTrack(*newTrack,extrapTrackParamAtCluster,addChi2TrackAtCluster); | |
612 | fNRecTracks++; | |
613 | ||
614 | // Printout for debuging | |
615 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
616 | cout << "FollowTrackInChamber: added one cluster in chamber(1..): " << nextChamber+1 << endl; | |
617 | if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump(); | |
618 | } | |
619 | ||
620 | } else if (addChi2TrackAtCluster < bestAddChi2TrackAtCluster) { | |
621 | // keep track of the best cluster | |
622 | bestAddChi2TrackAtCluster = addChi2TrackAtCluster; | |
623 | bestTrackParamAtCluster = extrapTrackParamAtCluster; | |
624 | } | |
625 | ||
626 | } | |
627 | ||
628 | } | |
629 | ||
630 | // fill out the best track if required else clean up the fRecTracksPtr array | |
a0dc65b4 | 631 | if (!GetRecoParam()->TrackAllTracks()) { |
9bf6860b | 632 | if (foundOneCluster) { |
633 | UpdateTrack(trackCandidate,bestTrackParamAtCluster,bestAddChi2TrackAtCluster); | |
634 | ||
635 | // Printout for debuging | |
636 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
637 | cout << "FollowTrackInChamber: added the best cluster in chamber(1..): " << bestTrackParamAtCluster.GetClusterPtr()->GetChamberId()+1 << endl; | |
638 | if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump(); | |
639 | } | |
640 | ||
641 | } else return kFALSE; | |
642 | ||
643 | } else if (foundOneCluster) { | |
644 | ||
645 | // remove obsolete track | |
646 | fRecTracksPtr->Remove(&trackCandidate); | |
647 | fNRecTracks--; | |
648 | ||
649 | } else return kFALSE; | |
650 | ||
651 | return kTRUE; | |
652 | ||
ea94c18b | 653 | } |
b0e4c598 | 654 | |
ea94c18b | 655 | //__________________________________________________________________________ |
1fef78c8 | 656 | Bool_t AliMUONTrackReconstructorK::FollowTrackInStation(AliMUONTrack &trackCandidate, AliMUONVClusterStore& clusterStore, Int_t nextStation) |
ea94c18b | 657 | { |
96ebe67e | 658 | /// Follow trackCandidate in station(0..) nextStation and search for compatible cluster(s) |
ea94c18b | 659 | /// Keep all possibilities or only the best one(s) according to the flag fgkTrackAllTracks: |
660 | /// kTRUE: duplicate "trackCandidate" if there are several possibilities and add the new tracks at the end of | |
661 | /// fRecTracksPtr to avoid conficts with other track candidates at this current stage of the tracking procedure. | |
662 | /// Remove the obsolete "trackCandidate" at the end. | |
96ebe67e | 663 | /// kFALSE: add only the best cluster(s) to the "trackCandidate". Try to add a couple of clusters in priority. |
664 | /// return kTRUE if new cluster(s) have been found (otherwise return kFALSE) | |
ea94c18b | 665 | AliDebug(1,Form("Enter FollowTrackInStation(1..) %d", nextStation+1)); |
666 | ||
667 | // Order the chamber according to the propagation direction (tracking starts with chamber 2): | |
668 | // - nextStation == station(1...) 5 => forward propagation | |
669 | // - nextStation < station(1...) 5 => backward propagation | |
670 | Int_t ch1, ch2; | |
671 | if (nextStation==4) { | |
672 | ch1 = 2*nextStation+1; | |
673 | ch2 = 2*nextStation; | |
674 | } else { | |
675 | ch1 = 2*nextStation; | |
676 | ch2 = 2*nextStation+1; | |
677 | } | |
678 | ||
96ebe67e | 679 | Double_t chi2OfCluster; |
a0dc65b4 | 680 | Double_t maxChi2OfCluster = 2. * GetRecoParam()->GetSigmaCutForTracking() * |
681 | GetRecoParam()->GetSigmaCutForTracking(); // 2 because 2 quantities in chi2 | |
96ebe67e | 682 | Double_t addChi2TrackAtCluster1; |
683 | Double_t addChi2TrackAtCluster2; | |
4ea3f013 | 684 | Double_t bestAddChi2TrackAtCluster1 = AliMUONTrack::MaxChi2(); |
685 | Double_t bestAddChi2TrackAtCluster2 = AliMUONTrack::MaxChi2(); | |
96ebe67e | 686 | Bool_t foundOneCluster = kFALSE; |
687 | Bool_t foundTwoClusters = kFALSE; | |
ea94c18b | 688 | AliMUONTrack *newTrack = 0x0; |
96ebe67e | 689 | AliMUONVCluster *clusterCh1, *clusterCh2; |
ea94c18b | 690 | AliMUONTrackParam extrapTrackParam; |
7332f213 | 691 | AliMUONTrackParam extrapTrackParamAtCh; |
96ebe67e | 692 | AliMUONTrackParam extrapTrackParamAtCluster1; |
693 | AliMUONTrackParam extrapTrackParamAtCluster2; | |
694 | AliMUONTrackParam bestTrackParamAtCluster1; | |
695 | AliMUONTrackParam bestTrackParamAtCluster2; | |
696 | ||
7332f213 | 697 | // Get track parameters according to the propagation direction |
7332f213 | 698 | if (nextStation==4) extrapTrackParamAtCh = *(AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->Last(); |
699 | else extrapTrackParamAtCh = *(AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->First(); | |
ea94c18b | 700 | |
9bf6860b | 701 | // Printout for debuging |
702 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 2) || (AliLog::GetGlobalDebugLevel() >= 2)) { | |
703 | cout<<endl<<"Track parameters and covariances at first cluster:"<<endl; | |
704 | extrapTrackParamAtCh.GetParameters().Print(); | |
705 | extrapTrackParamAtCh.GetCovariances().Print(); | |
706 | } | |
707 | ||
ea94c18b | 708 | // Add MCS effect |
4663da9f | 709 | Int_t currentChamber = extrapTrackParamAtCh.GetClusterPtr()->GetChamberId(); |
710 | AliMUONTrackExtrap::AddMCSEffect(&extrapTrackParamAtCh,AliMUONConstants::ChamberThicknessInX0(currentChamber),-1.); | |
ea94c18b | 711 | |
712 | // reset propagator for smoother | |
a0dc65b4 | 713 | if (GetRecoParam()->UseSmoother()) extrapTrackParamAtCh.ResetPropagator(); |
ea94c18b | 714 | |
9bf6860b | 715 | // Add MCS in the missing chamber(s) if any |
9bf6860b | 716 | while (ch1 < ch2 && currentChamber > ch2 + 1) { |
ea94c18b | 717 | // extrapolation to the missing chamber |
9bf6860b | 718 | currentChamber--; |
4ea3f013 | 719 | if (!AliMUONTrackExtrap::ExtrapToZCov(&extrapTrackParamAtCh, AliMUONConstants::DefaultChamberZ(currentChamber), |
720 | GetRecoParam()->UseSmoother())) return kFALSE; | |
ea94c18b | 721 | // add MCS effect |
4663da9f | 722 | AliMUONTrackExtrap::AddMCSEffect(&extrapTrackParamAtCh,AliMUONConstants::ChamberThicknessInX0(currentChamber),-1.); |
ea94c18b | 723 | } |
724 | ||
725 | //Extrapolate trackCandidate to chamber "ch2" | |
4ea3f013 | 726 | if (!AliMUONTrackExtrap::ExtrapToZCov(&extrapTrackParamAtCh, AliMUONConstants::DefaultChamberZ(ch2), |
727 | GetRecoParam()->UseSmoother())) return kFALSE; | |
ea94c18b | 728 | |
729 | // Printout for debuging | |
730 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 2) || (AliLog::GetGlobalDebugLevel() >= 2)) { | |
9bf6860b | 731 | cout<<endl<<"Track parameters and covariances at first cluster extrapolated to z = "<<AliMUONConstants::DefaultChamberZ(ch2)<<":"<<endl; |
732 | extrapTrackParamAtCh.GetParameters().Print(); | |
019df241 | 733 | extrapTrackParamAtCh.GetCovariances().Print(); |
ea94c18b | 734 | } |
735 | ||
736 | // Printout for debuging | |
737 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
96ebe67e | 738 | cout << "FollowTrackInStation: look for clusters in chamber(1..): " << ch2+1 << endl; |
ea94c18b | 739 | } |
740 | ||
1fef78c8 | 741 | // Ask the clustering to reconstruct new clusters around the track position in the current station |
742 | // except for station 4 and 5 that are already entirely clusterized | |
a0dc65b4 | 743 | if (GetRecoParam()->CombineClusterTrackReco()) { |
1fef78c8 | 744 | if (nextStation < 3) AskForNewClustersInStation(extrapTrackParamAtCh, clusterStore, nextStation); |
745 | } | |
746 | ||
4ea3f013 | 747 | Int_t nClusters = clusterStore.GetSize(); |
748 | Bool_t *clusterCh1Used = new Bool_t[nClusters]; | |
749 | for (Int_t i = 0; i < nClusters; i++) clusterCh1Used[i] = kFALSE; | |
750 | Int_t iCluster1; | |
751 | ||
96ebe67e | 752 | // Create iterators to loop over clusters in both chambers |
753 | TIter nextInCh1(clusterStore.CreateChamberIterator(ch1,ch1)); | |
754 | TIter nextInCh2(clusterStore.CreateChamberIterator(ch2,ch2)); | |
755 | ||
756 | // look for candidates in chamber 2 | |
757 | while ( ( clusterCh2 = static_cast<AliMUONVCluster*>(nextInCh2()) ) ) { | |
ea94c18b | 758 | |
96ebe67e | 759 | // try to add the current cluster fast |
760 | if (!TryOneClusterFast(extrapTrackParamAtCh, clusterCh2)) continue; | |
019df241 | 761 | |
96ebe67e | 762 | // try to add the current cluster accuratly |
763 | chi2OfCluster = TryOneCluster(extrapTrackParamAtCh, clusterCh2, extrapTrackParamAtCluster2, | |
a0dc65b4 | 764 | GetRecoParam()->UseSmoother()); |
ea94c18b | 765 | |
96ebe67e | 766 | // if good chi2 then try to attach a cluster in the other chamber too |
767 | if (chi2OfCluster < maxChi2OfCluster) { | |
ea94c18b | 768 | |
a0dc65b4 | 769 | if (GetRecoParam()->UseSmoother()) { |
ea94c18b | 770 | // save extrapolated parameters for smoother |
96ebe67e | 771 | extrapTrackParamAtCluster2.SetExtrapParameters(extrapTrackParamAtCluster2.GetParameters()); |
ea94c18b | 772 | |
773 | // save extrapolated covariance matrix for smoother | |
96ebe67e | 774 | extrapTrackParamAtCluster2.SetExtrapCovariances(extrapTrackParamAtCluster2.GetCovariances()); |
ea94c18b | 775 | } |
776 | ||
96ebe67e | 777 | // Compute new track parameters including "clusterCh2" using kalman filter |
778 | addChi2TrackAtCluster2 = RunKalmanFilter(extrapTrackParamAtCluster2); | |
ea94c18b | 779 | |
6b191dea | 780 | // skip track out of limits |
781 | if (!IsAcceptable(extrapTrackParamAtCluster2)) continue; | |
89c8d66d | 782 | |
783 | // Printout for debuging | |
784 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
785 | cout << "FollowTrackInStation: found one cluster in chamber(1..): " << ch2+1 | |
786 | << " (Chi2 = " << chi2OfCluster << ")" << endl; | |
787 | clusterCh2->Print(); | |
788 | cout << " look for second clusters in chamber(1..): " << ch1+1 << " ..." << endl; | |
789 | } | |
790 | ||
ea94c18b | 791 | // copy new track parameters for next step |
96ebe67e | 792 | extrapTrackParam = extrapTrackParamAtCluster2; |
ea94c18b | 793 | |
794 | // add MCS effect | |
4663da9f | 795 | AliMUONTrackExtrap::AddMCSEffect(&extrapTrackParam,AliMUONConstants::ChamberThicknessInX0(ch2),-1.); |
ea94c18b | 796 | |
797 | // reset propagator for smoother | |
a0dc65b4 | 798 | if (GetRecoParam()->UseSmoother()) extrapTrackParam.ResetPropagator(); |
ea94c18b | 799 | |
019df241 | 800 | //Extrapolate track parameters to chamber "ch1" |
4ea3f013 | 801 | Bool_t normalExtrap = AliMUONTrackExtrap::ExtrapToZCov(&extrapTrackParam, AliMUONConstants::DefaultChamberZ(ch1), |
802 | GetRecoParam()->UseSmoother()); | |
019df241 | 803 | |
96ebe67e | 804 | // reset cluster iterator of chamber 1 |
805 | nextInCh1.Reset(); | |
806 | iCluster1 = -1; | |
807 | ||
808 | // look for second candidates in chamber 1 | |
89c8d66d | 809 | Bool_t foundSecondCluster = kFALSE; |
4ea3f013 | 810 | if (normalExtrap) while ( ( clusterCh1 = static_cast<AliMUONVCluster*>(nextInCh1()) ) ) { |
96ebe67e | 811 | iCluster1++; |
ea94c18b | 812 | |
96ebe67e | 813 | // try to add the current cluster fast |
814 | if (!TryOneClusterFast(extrapTrackParam, clusterCh1)) continue; | |
019df241 | 815 | |
96ebe67e | 816 | // try to add the current cluster accuratly |
817 | chi2OfCluster = TryOneCluster(extrapTrackParam, clusterCh1, extrapTrackParamAtCluster1, | |
a0dc65b4 | 818 | GetRecoParam()->UseSmoother()); |
019df241 | 819 | |
96ebe67e | 820 | // if good chi2 then consider to add the 2 clusters to the "trackCandidate" |
821 | if (chi2OfCluster < maxChi2OfCluster) { | |
019df241 | 822 | |
a0dc65b4 | 823 | if (GetRecoParam()->UseSmoother()) { |
ea94c18b | 824 | // save extrapolated parameters for smoother |
96ebe67e | 825 | extrapTrackParamAtCluster1.SetExtrapParameters(extrapTrackParamAtCluster1.GetParameters()); |
ea94c18b | 826 | |
827 | // save extrapolated covariance matrix for smoother | |
96ebe67e | 828 | extrapTrackParamAtCluster1.SetExtrapCovariances(extrapTrackParamAtCluster1.GetCovariances()); |
ea94c18b | 829 | } |
830 | ||
96ebe67e | 831 | // Compute new track parameters including "clusterCh1" using kalman filter |
832 | addChi2TrackAtCluster1 = RunKalmanFilter(extrapTrackParamAtCluster1); | |
ea94c18b | 833 | |
6b191dea | 834 | // skip track out of limits |
835 | if (!IsAcceptable(extrapTrackParamAtCluster1)) continue; | |
89c8d66d | 836 | |
837 | // remember a second cluster was found | |
838 | foundSecondCluster = kTRUE; | |
839 | foundTwoClusters = kTRUE; | |
840 | ||
841 | // Printout for debuging | |
842 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
843 | cout << "FollowTrackInStation: found one cluster in chamber(1..): " << ch1+1 | |
844 | << " (Chi2 = " << chi2OfCluster << ")" << endl; | |
845 | clusterCh1->Print(); | |
846 | } | |
9bf6860b | 847 | |
a0dc65b4 | 848 | if (GetRecoParam()->TrackAllTracks()) { |
96ebe67e | 849 | // copy trackCandidate into a new track put at the end of fRecTracksPtr and add the new clusters |
ea94c18b | 850 | newTrack = new ((*fRecTracksPtr)[fRecTracksPtr->GetLast()+1]) AliMUONTrack(trackCandidate); |
96ebe67e | 851 | UpdateTrack(*newTrack,extrapTrackParamAtCluster1,extrapTrackParamAtCluster2,addChi2TrackAtCluster1,addChi2TrackAtCluster2); |
ea94c18b | 852 | fNRecTracks++; |
853 | ||
96ebe67e | 854 | // Tag clusterCh1 as used |
855 | clusterCh1Used[iCluster1] = kTRUE; | |
ea94c18b | 856 | |
857 | // Printout for debuging | |
858 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
96ebe67e | 859 | cout << "FollowTrackInStation: added two clusters in station(1..): " << nextStation+1 << endl; |
ea94c18b | 860 | if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump(); |
861 | } | |
862 | ||
96ebe67e | 863 | } else if (addChi2TrackAtCluster1+addChi2TrackAtCluster2 < bestAddChi2TrackAtCluster1+bestAddChi2TrackAtCluster2) { |
864 | // keep track of the best couple of clusters | |
865 | bestAddChi2TrackAtCluster1 = addChi2TrackAtCluster1; | |
866 | bestAddChi2TrackAtCluster2 = addChi2TrackAtCluster2; | |
867 | bestTrackParamAtCluster1 = extrapTrackParamAtCluster1; | |
868 | bestTrackParamAtCluster2 = extrapTrackParamAtCluster2; | |
ea94c18b | 869 | } |
870 | ||
b0e4c598 | 871 | } |
ea94c18b | 872 | |
8cc77df0 | 873 | } |
ea94c18b | 874 | |
96ebe67e | 875 | // if no clusterCh1 found then consider to add clusterCh2 only |
876 | if (!foundSecondCluster) { | |
89c8d66d | 877 | |
878 | // remember a cluster was found | |
96ebe67e | 879 | foundOneCluster = kTRUE; |
ea94c18b | 880 | |
a0dc65b4 | 881 | if (GetRecoParam()->TrackAllTracks()) { |
96ebe67e | 882 | // copy trackCandidate into a new track put at the end of fRecTracksPtr and add the new cluster |
ea94c18b | 883 | newTrack = new ((*fRecTracksPtr)[fRecTracksPtr->GetLast()+1]) AliMUONTrack(trackCandidate); |
96ebe67e | 884 | UpdateTrack(*newTrack,extrapTrackParamAtCluster2,addChi2TrackAtCluster2); |
ea94c18b | 885 | fNRecTracks++; |
886 | ||
ea94c18b | 887 | // Printout for debuging |
888 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
96ebe67e | 889 | cout << "FollowTrackInStation: added one cluster in chamber(1..): " << ch2+1 << endl; |
ea94c18b | 890 | if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump(); |
891 | } | |
892 | ||
96ebe67e | 893 | } else if (!foundTwoClusters && addChi2TrackAtCluster2 < bestAddChi2TrackAtCluster1) { |
894 | // keep track of the best single cluster except if a couple of clusters has already been found | |
895 | bestAddChi2TrackAtCluster1 = addChi2TrackAtCluster2; | |
896 | bestTrackParamAtCluster1 = extrapTrackParamAtCluster2; | |
ea94c18b | 897 | } |
898 | ||
899 | } | |
900 | ||
8cc77df0 | 901 | } |
ea94c18b | 902 | |
903 | } | |
904 | ||
905 | // look for candidates in chamber 1 not already attached to a track | |
96ebe67e | 906 | // if we want to keep all possible tracks or if no good couple of clusters has been found |
a0dc65b4 | 907 | if (GetRecoParam()->TrackAllTracks() || !foundTwoClusters) { |
ea94c18b | 908 | |
ea94c18b | 909 | // add MCS effect for next step |
4663da9f | 910 | AliMUONTrackExtrap::AddMCSEffect(&extrapTrackParamAtCh,AliMUONConstants::ChamberThicknessInX0(ch2),-1.); |
019df241 | 911 | |
912 | //Extrapolate trackCandidate to chamber "ch1" | |
4ea3f013 | 913 | Bool_t normalExtrap = AliMUONTrackExtrap::ExtrapToZCov(&extrapTrackParamAtCh, AliMUONConstants::DefaultChamberZ(ch1), |
914 | GetRecoParam()->UseSmoother()); | |
019df241 | 915 | |
9bf6860b | 916 | // Printout for debuging |
917 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 2) || (AliLog::GetGlobalDebugLevel() >= 2)) { | |
918 | cout<<endl<<"Track parameters and covariances at first cluster extrapolated to z = "<<AliMUONConstants::DefaultChamberZ(ch1)<<":"<<endl; | |
919 | extrapTrackParamAtCh.GetParameters().Print(); | |
920 | extrapTrackParamAtCh.GetCovariances().Print(); | |
921 | } | |
922 | ||
923 | // Printout for debuging | |
924 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
925 | cout << "FollowTrackInStation: look for single clusters in chamber(1..): " << ch1+1 << endl; | |
926 | } | |
927 | ||
96ebe67e | 928 | // reset cluster iterator of chamber 1 |
929 | nextInCh1.Reset(); | |
930 | iCluster1 = -1; | |
931 | ||
932 | // look for second candidates in chamber 1 | |
4ea3f013 | 933 | if (normalExtrap) while ( ( clusterCh1 = static_cast<AliMUONVCluster*>(nextInCh1()) ) ) { |
96ebe67e | 934 | iCluster1++; |
ea94c18b | 935 | |
96ebe67e | 936 | if (clusterCh1Used[iCluster1]) continue; // Skip clusters already used |
ea94c18b | 937 | |
96ebe67e | 938 | // try to add the current cluster fast |
939 | if (!TryOneClusterFast(extrapTrackParamAtCh, clusterCh1)) continue; | |
019df241 | 940 | |
96ebe67e | 941 | // try to add the current cluster accuratly |
942 | chi2OfCluster = TryOneCluster(extrapTrackParamAtCh, clusterCh1, extrapTrackParamAtCluster1, | |
a0dc65b4 | 943 | GetRecoParam()->UseSmoother()); |
019df241 | 944 | |
96ebe67e | 945 | // if good chi2 then consider to add clusterCh1 |
946 | // We do not try to attach a cluster in the other chamber too since it has already been done above | |
947 | if (chi2OfCluster < maxChi2OfCluster) { | |
019df241 | 948 | |
a0dc65b4 | 949 | if (GetRecoParam()->UseSmoother()) { |
ea94c18b | 950 | // save extrapolated parameters for smoother |
96ebe67e | 951 | extrapTrackParamAtCluster1.SetExtrapParameters(extrapTrackParamAtCluster1.GetParameters()); |
ea94c18b | 952 | |
953 | // save extrapolated covariance matrix for smoother | |
96ebe67e | 954 | extrapTrackParamAtCluster1.SetExtrapCovariances(extrapTrackParamAtCluster1.GetCovariances()); |
ea94c18b | 955 | } |
956 | ||
96ebe67e | 957 | // Compute new track parameters including "clusterCh1" using kalman filter |
958 | addChi2TrackAtCluster1 = RunKalmanFilter(extrapTrackParamAtCluster1); | |
ea94c18b | 959 | |
6b191dea | 960 | // skip track out of limits |
961 | if (!IsAcceptable(extrapTrackParamAtCluster1)) continue; | |
89c8d66d | 962 | |
963 | // remember a cluster was found | |
964 | foundOneCluster = kTRUE; | |
965 | ||
966 | // Printout for debuging | |
967 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
968 | cout << "FollowTrackInStation: found one cluster in chamber(1..): " << ch1+1 | |
969 | << " (Chi2 = " << chi2OfCluster << ")" << endl; | |
970 | clusterCh1->Print(); | |
971 | } | |
9bf6860b | 972 | |
a0dc65b4 | 973 | if (GetRecoParam()->TrackAllTracks()) { |
96ebe67e | 974 | // copy trackCandidate into a new track put at the end of fRecTracksPtr and add the new cluster |
ea94c18b | 975 | newTrack = new ((*fRecTracksPtr)[fRecTracksPtr->GetLast()+1]) AliMUONTrack(trackCandidate); |
96ebe67e | 976 | UpdateTrack(*newTrack,extrapTrackParamAtCluster1,addChi2TrackAtCluster1); |
ea94c18b | 977 | fNRecTracks++; |
978 | ||
ea94c18b | 979 | // Printout for debuging |
980 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
96ebe67e | 981 | cout << "FollowTrackInStation: added one cluster in chamber(1..): " << ch1+1 << endl; |
ea94c18b | 982 | if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump(); |
983 | } | |
984 | ||
96ebe67e | 985 | } else if (addChi2TrackAtCluster1 < bestAddChi2TrackAtCluster1) { |
986 | // keep track of the best single cluster except if a couple of clusters has already been found | |
987 | bestAddChi2TrackAtCluster1 = addChi2TrackAtCluster1; | |
988 | bestTrackParamAtCluster1 = extrapTrackParamAtCluster1; | |
ea94c18b | 989 | } |
990 | ||
991 | } | |
992 | ||
8cc77df0 | 993 | } |
ea94c18b | 994 | |
995 | } | |
996 | ||
997 | // fill out the best track if required else clean up the fRecTracksPtr array | |
a0dc65b4 | 998 | if (!GetRecoParam()->TrackAllTracks()) { |
96ebe67e | 999 | if (foundTwoClusters) { |
1000 | UpdateTrack(trackCandidate,bestTrackParamAtCluster1,bestTrackParamAtCluster2,bestAddChi2TrackAtCluster1,bestAddChi2TrackAtCluster2); | |
ea94c18b | 1001 | |
ea94c18b | 1002 | // Printout for debuging |
1003 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
96ebe67e | 1004 | cout << "FollowTrackInStation: added the two best clusters in station(1..): " << nextStation+1 << endl; |
ea94c18b | 1005 | if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump(); |
1006 | } | |
1007 | ||
96ebe67e | 1008 | } else if (foundOneCluster) { |
1009 | UpdateTrack(trackCandidate,bestTrackParamAtCluster1,bestAddChi2TrackAtCluster1); | |
ea94c18b | 1010 | |
ea94c18b | 1011 | // Printout for debuging |
1012 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
96ebe67e | 1013 | cout << "FollowTrackInStation: added the best cluster in chamber(1..): " << bestTrackParamAtCluster1.GetClusterPtr()->GetChamberId()+1 << endl; |
ea94c18b | 1014 | if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump(); |
1015 | } | |
1016 | ||
17773e2e | 1017 | } else { |
96ebe67e | 1018 | delete [] clusterCh1Used; |
17773e2e | 1019 | return kFALSE; |
1020 | } | |
9bf6860b | 1021 | |
96ebe67e | 1022 | } else if (foundOneCluster || foundTwoClusters) { |
ea94c18b | 1023 | |
1024 | // remove obsolete track | |
1025 | fRecTracksPtr->Remove(&trackCandidate); | |
1026 | fNRecTracks--; | |
1027 | ||
17773e2e | 1028 | } else { |
96ebe67e | 1029 | delete [] clusterCh1Used; |
17773e2e | 1030 | return kFALSE; |
9bf6860b | 1031 | } |
1032 | ||
96ebe67e | 1033 | delete [] clusterCh1Used; |
ea94c18b | 1034 | return kTRUE; |
1035 | ||
1036 | } | |
8cc77df0 | 1037 | |
ea94c18b | 1038 | //__________________________________________________________________________ |
96ebe67e | 1039 | Double_t AliMUONTrackReconstructorK::RunKalmanFilter(AliMUONTrackParam &trackParamAtCluster) |
ea94c18b | 1040 | { |
96ebe67e | 1041 | /// Compute new track parameters and their covariances including new cluster using kalman filter |
ea94c18b | 1042 | /// return the additional track chi2 |
1043 | AliDebug(1,"Enter RunKalmanFilter"); | |
1044 | ||
1045 | // Get actual track parameters (p) | |
96ebe67e | 1046 | TMatrixD param(trackParamAtCluster.GetParameters()); |
ea94c18b | 1047 | |
96ebe67e | 1048 | // Get new cluster parameters (m) |
1049 | AliMUONVCluster *cluster = trackParamAtCluster.GetClusterPtr(); | |
1050 | TMatrixD clusterParam(5,1); | |
1051 | clusterParam.Zero(); | |
1052 | clusterParam(0,0) = cluster->GetX(); | |
1053 | clusterParam(2,0) = cluster->GetY(); | |
ea94c18b | 1054 | |
1055 | // Compute the actual parameter weight (W) | |
96ebe67e | 1056 | TMatrixD paramWeight(trackParamAtCluster.GetCovariances()); |
ea94c18b | 1057 | if (paramWeight.Determinant() != 0) { |
1058 | paramWeight.Invert(); | |
1059 | } else { | |
1060 | AliWarning(" Determinant = 0"); | |
4ea3f013 | 1061 | return 2.*AliMUONTrack::MaxChi2(); |
8cc77df0 | 1062 | } |
ea94c18b | 1063 | |
96ebe67e | 1064 | // Compute the new cluster weight (U) |
1065 | TMatrixD clusterWeight(5,5); | |
1066 | clusterWeight.Zero(); | |
1067 | clusterWeight(0,0) = 1. / cluster->GetErrX2(); | |
1068 | clusterWeight(2,2) = 1. / cluster->GetErrY2(); | |
8cc77df0 | 1069 | |
ea94c18b | 1070 | // Compute the new parameters covariance matrix ( (W+U)^-1 ) |
96ebe67e | 1071 | TMatrixD newParamCov(paramWeight,TMatrixD::kPlus,clusterWeight); |
ea94c18b | 1072 | if (newParamCov.Determinant() != 0) { |
1073 | newParamCov.Invert(); | |
1074 | } else { | |
1075 | AliWarning(" Determinant = 0"); | |
4ea3f013 | 1076 | return 2.*AliMUONTrack::MaxChi2(); |
ea94c18b | 1077 | } |
1078 | ||
1079 | // Save the new parameters covariance matrix | |
96ebe67e | 1080 | trackParamAtCluster.SetCovariances(newParamCov); |
ea94c18b | 1081 | |
1082 | // Compute the new parameters (p' = ((W+U)^-1)U(m-p) + p) | |
96ebe67e | 1083 | TMatrixD tmp(clusterParam,TMatrixD::kMinus,param); |
1084 | TMatrixD tmp2(clusterWeight,TMatrixD::kMult,tmp); // U(m-p) | |
ea94c18b | 1085 | TMatrixD newParam(newParamCov,TMatrixD::kMult,tmp2); // ((W+U)^-1)U(m-p) |
1086 | newParam += param; // ((W+U)^-1)U(m-p) + p | |
1087 | ||
1088 | // Save the new parameters | |
96ebe67e | 1089 | trackParamAtCluster.SetParameters(newParam); |
ea94c18b | 1090 | |
1091 | // Compute the additional chi2 (= ((p'-p)^-1)W(p'-p) + ((p'-m)^-1)U(p'-m)) | |
1092 | tmp = newParam; // p' | |
1093 | tmp -= param; // (p'-p) | |
1094 | TMatrixD tmp3(paramWeight,TMatrixD::kMult,tmp); // W(p'-p) | |
1095 | TMatrixD addChi2Track(tmp,TMatrixD::kTransposeMult,tmp3); // ((p'-p)^-1)W(p'-p) | |
1096 | tmp = newParam; // p' | |
96ebe67e | 1097 | tmp -= clusterParam; // (p'-m) |
1098 | TMatrixD tmp4(clusterWeight,TMatrixD::kMult,tmp); // U(p'-m) | |
ea94c18b | 1099 | addChi2Track += TMatrixD(tmp,TMatrixD::kTransposeMult,tmp4); // ((p'-p)^-1)W(p'-p) + ((p'-m)^-1)U(p'-m) |
1100 | ||
1101 | return addChi2Track(0,0); | |
1102 | ||
8cc77df0 | 1103 | } |
1104 | ||
ea94c18b | 1105 | //__________________________________________________________________________ |
96ebe67e | 1106 | void AliMUONTrackReconstructorK::UpdateTrack(AliMUONTrack &track, AliMUONTrackParam &trackParamAtCluster, Double_t addChi2) |
8cc77df0 | 1107 | { |
96ebe67e | 1108 | /// Add 1 cluster to the track candidate |
ea94c18b | 1109 | /// Update chi2 of the track |
1110 | ||
9bf6860b | 1111 | // Flag cluster as being (not) removable |
a0dc65b4 | 1112 | if (GetRecoParam()->RequestStation(trackParamAtCluster.GetClusterPtr()->GetChamberId()/2)) |
9bf6860b | 1113 | trackParamAtCluster.SetRemovable(kFALSE); |
1114 | else trackParamAtCluster.SetRemovable(kTRUE); | |
96ebe67e | 1115 | trackParamAtCluster.SetLocalChi2(0.); // --> Local chi2 not used |
5f4ceff2 | 1116 | |
96ebe67e | 1117 | // Update the track chi2 into trackParamAtCluster |
1118 | trackParamAtCluster.SetTrackChi2(track.GetGlobalChi2() + addChi2); | |
ea94c18b | 1119 | |
1120 | // Update the chi2 of the new track | |
96ebe67e | 1121 | track.SetGlobalChi2(trackParamAtCluster.GetTrackChi2()); |
ea94c18b | 1122 | |
96ebe67e | 1123 | // Update array of TrackParamAtCluster |
1124 | track.AddTrackParamAtCluster(trackParamAtCluster,*(trackParamAtCluster.GetClusterPtr())); | |
ea94c18b | 1125 | |
1126 | } | |
8cc77df0 | 1127 | |
ea94c18b | 1128 | //__________________________________________________________________________ |
96ebe67e | 1129 | void AliMUONTrackReconstructorK::UpdateTrack(AliMUONTrack &track, AliMUONTrackParam &trackParamAtCluster1, AliMUONTrackParam &trackParamAtCluster2, |
1130 | Double_t addChi2AtCluster1, Double_t addChi2AtCluster2) | |
ea94c18b | 1131 | { |
96ebe67e | 1132 | /// Add 2 clusters to the track candidate (order is important) |
ea94c18b | 1133 | /// Update track and local chi2 |
1134 | ||
96ebe67e | 1135 | // Update local chi2 at first cluster |
1136 | AliMUONVCluster* cluster1 = trackParamAtCluster1.GetClusterPtr(); | |
1137 | Double_t deltaX = trackParamAtCluster1.GetNonBendingCoor() - cluster1->GetX(); | |
1138 | Double_t deltaY = trackParamAtCluster1.GetBendingCoor() - cluster1->GetY(); | |
1139 | Double_t localChi2AtCluster1 = deltaX*deltaX / cluster1->GetErrX2() + | |
1140 | deltaY*deltaY / cluster1->GetErrY2(); | |
1141 | trackParamAtCluster1.SetLocalChi2(localChi2AtCluster1); | |
ea94c18b | 1142 | |
96ebe67e | 1143 | // Flag first cluster as being removable |
1144 | trackParamAtCluster1.SetRemovable(kTRUE); | |
ea94c18b | 1145 | |
96ebe67e | 1146 | // Update local chi2 at second cluster |
1147 | AliMUONVCluster* cluster2 = trackParamAtCluster2.GetClusterPtr(); | |
1148 | AliMUONTrackParam extrapTrackParamAtCluster2(trackParamAtCluster1); | |
1149 | AliMUONTrackExtrap::ExtrapToZ(&extrapTrackParamAtCluster2, trackParamAtCluster2.GetZ()); | |
1150 | deltaX = extrapTrackParamAtCluster2.GetNonBendingCoor() - cluster2->GetX(); | |
1151 | deltaY = extrapTrackParamAtCluster2.GetBendingCoor() - cluster2->GetY(); | |
1152 | Double_t localChi2AtCluster2 = deltaX*deltaX / cluster2->GetErrX2() + | |
1153 | deltaY*deltaY / cluster2->GetErrY2(); | |
1154 | trackParamAtCluster2.SetLocalChi2(localChi2AtCluster2); | |
ea94c18b | 1155 | |
96ebe67e | 1156 | // Flag second cluster as being removable |
1157 | trackParamAtCluster2.SetRemovable(kTRUE); | |
ea94c18b | 1158 | |
96ebe67e | 1159 | // Update the track chi2 into trackParamAtCluster2 |
1160 | trackParamAtCluster2.SetTrackChi2(track.GetGlobalChi2() + addChi2AtCluster2); | |
ea94c18b | 1161 | |
96ebe67e | 1162 | // Update the track chi2 into trackParamAtCluster1 |
1163 | trackParamAtCluster1.SetTrackChi2(trackParamAtCluster2.GetTrackChi2() + addChi2AtCluster1); | |
ea94c18b | 1164 | |
1165 | // Update the chi2 of the new track | |
96ebe67e | 1166 | track.SetGlobalChi2(trackParamAtCluster1.GetTrackChi2()); |
ea94c18b | 1167 | |
96ebe67e | 1168 | // Update array of trackParamAtCluster |
1169 | track.AddTrackParamAtCluster(trackParamAtCluster1,*cluster1); | |
1170 | track.AddTrackParamAtCluster(trackParamAtCluster2,*cluster2); | |
ea94c18b | 1171 | |
1172 | } | |
8cc77df0 | 1173 | |
ea94c18b | 1174 | //__________________________________________________________________________ |
1fef78c8 | 1175 | Bool_t AliMUONTrackReconstructorK::RecoverTrack(AliMUONTrack &trackCandidate, AliMUONVClusterStore& clusterStore, Int_t nextStation) |
ea94c18b | 1176 | { |
1177 | /// Try to recover the track candidate in the next station | |
96ebe67e | 1178 | /// by removing the worst of the two clusters attached in the current station |
ea94c18b | 1179 | /// Return kTRUE if recovering succeeds |
1180 | AliDebug(1,"Enter RecoverTrack"); | |
1181 | ||
96ebe67e | 1182 | // Do not try to recover track until we have attached cluster(s) on station(1..) 3 |
ea94c18b | 1183 | if (nextStation > 1) return kFALSE; |
1184 | ||
96ebe67e | 1185 | Int_t worstClusterNumber = -1; |
9bf6860b | 1186 | Double_t localChi2, worstLocalChi2 = -1.; |
ea94c18b | 1187 | |
96ebe67e | 1188 | // Look for the cluster to remove |
1189 | for (Int_t clusterNumber = 0; clusterNumber < 2; clusterNumber++) { | |
1190 | AliMUONTrackParam *trackParamAtCluster = (AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->UncheckedAt(clusterNumber); | |
ea94c18b | 1191 | |
9bf6860b | 1192 | // check if current cluster is in the previous station |
1193 | if (trackParamAtCluster->GetClusterPtr()->GetChamberId()/2 != nextStation+1) break; | |
1194 | ||
96ebe67e | 1195 | // check if current cluster is removable |
1196 | if (!trackParamAtCluster->IsRemovable()) return kFALSE; | |
ea94c18b | 1197 | |
9bf6860b | 1198 | // reset the current cluster as being not removable if it is on a required station |
a0dc65b4 | 1199 | if (GetRecoParam()->RequestStation(nextStation+1)) trackParamAtCluster->SetRemovable(kFALSE); |
9bf6860b | 1200 | |
96ebe67e | 1201 | // Pick up cluster with the worst chi2 |
1202 | localChi2 = trackParamAtCluster->GetLocalChi2(); | |
1203 | if (localChi2 > worstLocalChi2) { | |
1204 | worstLocalChi2 = localChi2; | |
1205 | worstClusterNumber = clusterNumber; | |
8cc77df0 | 1206 | } |
ea94c18b | 1207 | } |
1208 | ||
9bf6860b | 1209 | // check if worst cluster found |
1210 | if (worstClusterNumber < 0) return kFALSE; | |
ea94c18b | 1211 | |
96ebe67e | 1212 | // Remove the worst cluster |
1213 | trackCandidate.RemoveTrackParamAtCluster((AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->UncheckedAt(worstClusterNumber)); | |
ea94c18b | 1214 | |
96ebe67e | 1215 | // Re-calculate track parameters at the (new) first cluster |
4ea3f013 | 1216 | if (!RetracePartialTrack(trackCandidate,(AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->UncheckedAt(1))) return kFALSE; |
ea94c18b | 1217 | |
6b191dea | 1218 | // skip track out of limits |
1219 | if (!IsAcceptable(*((AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->First()))) return kFALSE; | |
9bf6860b | 1220 | |
96ebe67e | 1221 | // Look for new cluster(s) in next station |
1222 | return FollowTrackInStation(trackCandidate, clusterStore, nextStation); | |
ea94c18b | 1223 | |
8cc77df0 | 1224 | } |
1225 | ||
1226 | //__________________________________________________________________________ | |
ea94c18b | 1227 | Bool_t AliMUONTrackReconstructorK::RunSmoother(AliMUONTrack &track) |
8cc77df0 | 1228 | { |
ea94c18b | 1229 | /// Compute new track parameters and their covariances using smoother |
3304fa09 | 1230 | AliDebug(1,"Enter UseSmoother"); |
ea94c18b | 1231 | |
96ebe67e | 1232 | AliMUONTrackParam *previousTrackParam = (AliMUONTrackParam*) track.GetTrackParamAtCluster()->First(); |
ea94c18b | 1233 | |
96ebe67e | 1234 | // Smoothed parameters and covariances at first cluster = filtered parameters and covariances |
ea94c18b | 1235 | previousTrackParam->SetSmoothParameters(previousTrackParam->GetParameters()); |
1236 | previousTrackParam->SetSmoothCovariances(previousTrackParam->GetCovariances()); | |
d1e6fdee | 1237 | |
1238 | AliMUONTrackParam *currentTrackParam = (AliMUONTrackParam*) track.GetTrackParamAtCluster()->After(previousTrackParam); | |
ea94c18b | 1239 | |
d1e6fdee | 1240 | // Save local chi2 at first cluster = last additional chi2 provided by Kalman |
1241 | previousTrackParam->SetLocalChi2(previousTrackParam->GetTrackChi2() - currentTrackParam->GetTrackChi2()); | |
ea94c18b | 1242 | |
ff078154 | 1243 | // if the track contains only 2 clusters simply copy the filtered parameters |
1244 | if (track.GetNClusters() == 2) { | |
1245 | currentTrackParam->SetSmoothParameters(currentTrackParam->GetParameters()); | |
1246 | currentTrackParam->SetSmoothCovariances(currentTrackParam->GetCovariances()); | |
1247 | currentTrackParam->SetLocalChi2(currentTrackParam->GetTrackChi2()); | |
1248 | return kTRUE; | |
1249 | } | |
1250 | ||
ea94c18b | 1251 | while (currentTrackParam) { |
1252 | ||
1253 | // Get variables | |
1254 | const TMatrixD &extrapParameters = previousTrackParam->GetExtrapParameters(); // X(k+1 k) | |
1255 | const TMatrixD &filteredParameters = currentTrackParam->GetParameters(); // X(k k) | |
1256 | const TMatrixD &previousSmoothParameters = previousTrackParam->GetSmoothParameters(); // X(k+1 n) | |
1257 | const TMatrixD &propagator = previousTrackParam->GetPropagator(); // F(k) | |
1258 | const TMatrixD &extrapCovariances = previousTrackParam->GetExtrapCovariances(); // C(k+1 k) | |
1259 | const TMatrixD &filteredCovariances = currentTrackParam->GetCovariances(); // C(k k) | |
1260 | const TMatrixD &previousSmoothCovariances = previousTrackParam->GetSmoothCovariances(); // C(k+1 n) | |
1261 | ||
d1e6fdee | 1262 | // Compute smoother gain: A(k) = C(kk) * F(k)^t * (C(k+1 k))^-1 |
ea94c18b | 1263 | TMatrixD extrapWeight(extrapCovariances); |
1264 | if (extrapWeight.Determinant() != 0) { | |
1265 | extrapWeight.Invert(); // (C(k+1 k))^-1 | |
1266 | } else { | |
1267 | AliWarning(" Determinant = 0"); | |
1268 | return kFALSE; | |
1269 | } | |
d1e6fdee | 1270 | TMatrixD smootherGain(filteredCovariances,TMatrixD::kMultTranspose,propagator); // C(kk) * F(k)^t |
1271 | smootherGain *= extrapWeight; // C(kk) * F(k)^t * (C(k+1 k))^-1 | |
ea94c18b | 1272 | |
1273 | // Compute smoothed parameters: X(k n) = X(k k) + A(k) * (X(k+1 n) - X(k+1 k)) | |
1274 | TMatrixD tmpParam(previousSmoothParameters,TMatrixD::kMinus,extrapParameters); // X(k+1 n) - X(k+1 k) | |
1275 | TMatrixD smoothParameters(smootherGain,TMatrixD::kMult,tmpParam); // A(k) * (X(k+1 n) - X(k+1 k)) | |
1276 | smoothParameters += filteredParameters; // X(k k) + A(k) * (X(k+1 n) - X(k+1 k)) | |
1277 | ||
1278 | // Save smoothed parameters | |
1279 | currentTrackParam->SetSmoothParameters(smoothParameters); | |
1280 | ||
1281 | // Compute smoothed covariances: C(k n) = C(k k) + A(k) * (C(k+1 n) - C(k+1 k)) * (A(k))^t | |
1282 | TMatrixD tmpCov(previousSmoothCovariances,TMatrixD::kMinus,extrapCovariances); // C(k+1 n) - C(k+1 k) | |
1283 | TMatrixD tmpCov2(tmpCov,TMatrixD::kMultTranspose,smootherGain); // (C(k+1 n) - C(k+1 k)) * (A(k))^t | |
1284 | TMatrixD smoothCovariances(smootherGain,TMatrixD::kMult,tmpCov2); // A(k) * (C(k+1 n) - C(k+1 k)) * (A(k))^t | |
1285 | smoothCovariances += filteredCovariances; // C(k k) + A(k) * (C(k+1 n) - C(k+1 k)) * (A(k))^t | |
1286 | ||
1287 | // Save smoothed covariances | |
1288 | currentTrackParam->SetSmoothCovariances(smoothCovariances); | |
1289 | ||
96ebe67e | 1290 | // Compute smoothed residual: r(k n) = cluster - X(k n) |
d1e6fdee | 1291 | AliMUONVCluster* cluster = currentTrackParam->GetClusterPtr(); |
ea94c18b | 1292 | TMatrixD smoothResidual(2,1); |
1293 | smoothResidual.Zero(); | |
96ebe67e | 1294 | smoothResidual(0,0) = cluster->GetX() - smoothParameters(0,0); |
1295 | smoothResidual(1,0) = cluster->GetY() - smoothParameters(2,0); | |
ea94c18b | 1296 | |
96ebe67e | 1297 | // Compute weight of smoothed residual: W(k n) = (clusterCov - C(k n))^-1 |
ea94c18b | 1298 | TMatrixD smoothResidualWeight(2,2); |
96ebe67e | 1299 | smoothResidualWeight(0,0) = cluster->GetErrX2() - smoothCovariances(0,0); |
ea94c18b | 1300 | smoothResidualWeight(0,1) = - smoothCovariances(0,2); |
1301 | smoothResidualWeight(1,0) = - smoothCovariances(2,0); | |
96ebe67e | 1302 | smoothResidualWeight(1,1) = cluster->GetErrY2() - smoothCovariances(2,2); |
ea94c18b | 1303 | if (smoothResidualWeight.Determinant() != 0) { |
1304 | smoothResidualWeight.Invert(); | |
1305 | } else { | |
1306 | AliWarning(" Determinant = 0"); | |
1307 | return kFALSE; | |
1308 | } | |
1309 | ||
1310 | // Compute local chi2 = (r(k n))^t * W(k n) * r(k n) | |
1311 | TMatrixD tmpChi2(smoothResidual,TMatrixD::kTransposeMult,smoothResidualWeight); // (r(k n))^t * W(k n) | |
1312 | TMatrixD localChi2(tmpChi2,TMatrixD::kMult,smoothResidual); // (r(k n))^t * W(k n) * r(k n) | |
1313 | ||
1314 | // Save local chi2 | |
1315 | currentTrackParam->SetLocalChi2(localChi2(0,0)); | |
1316 | ||
1317 | previousTrackParam = currentTrackParam; | |
96ebe67e | 1318 | currentTrackParam = (AliMUONTrackParam*) track.GetTrackParamAtCluster()->After(previousTrackParam); |
ea94c18b | 1319 | } |
1320 | ||
1321 | return kTRUE; | |
1322 | ||
8cc77df0 | 1323 | } |
1324 | ||
8cc77df0 | 1325 | //__________________________________________________________________________ |
89c8d66d | 1326 | Bool_t AliMUONTrackReconstructorK::ComplementTracks(const AliMUONVClusterStore& clusterStore) |
b709ac13 | 1327 | { |
1328 | /// Complete tracks by adding missing clusters (if there is an overlap between | |
89c8d66d | 1329 | /// two detection elements, the track may have two clusters in the same chamber). |
1330 | /// Recompute track parameters and covariances at each clusters. | |
4ea3f013 | 1331 | /// Remove tracks getting abnormal (i.e. extrapolation failed...) after being complemented. |
1332 | /// Return kTRUE if one or more tracks have been complemented or removed. | |
b709ac13 | 1333 | AliDebug(1,"Enter ComplementTracks"); |
1334 | ||
1335 | Int_t chamberId, detElemId; | |
96ebe67e | 1336 | Double_t chi2OfCluster, addChi2TrackAtCluster, bestAddChi2TrackAtCluster; |
a0dc65b4 | 1337 | Double_t maxChi2OfCluster = 2. * GetRecoParam()->GetSigmaCutForTracking() * |
1338 | GetRecoParam()->GetSigmaCutForTracking(); // 2 because 2 quantities in chi2 | |
89c8d66d | 1339 | Bool_t foundOneCluster, trackModified, hasChanged = kFALSE; |
96ebe67e | 1340 | AliMUONVCluster *cluster; |
1341 | AliMUONTrackParam *trackParam, *previousTrackParam, *nextTrackParam, trackParamAtCluster, bestTrackParamAtCluster; | |
4ea3f013 | 1342 | AliMUONTrack *nextTrack; |
b709ac13 | 1343 | |
b709ac13 | 1344 | AliMUONTrack *track = (AliMUONTrack*) fRecTracksPtr->First(); |
1345 | while (track) { | |
1346 | trackModified = kFALSE; | |
1347 | ||
96ebe67e | 1348 | trackParam = (AliMUONTrackParam*)track->GetTrackParamAtCluster()->First(); |
b709ac13 | 1349 | previousTrackParam = trackParam; |
1350 | while (trackParam) { | |
96ebe67e | 1351 | foundOneCluster = kFALSE; |
4ea3f013 | 1352 | bestAddChi2TrackAtCluster = AliMUONTrack::MaxChi2(); |
96ebe67e | 1353 | chamberId = trackParam->GetClusterPtr()->GetChamberId(); |
1354 | detElemId = trackParam->GetClusterPtr()->GetDetElemId(); | |
b709ac13 | 1355 | |
1356 | // prepare nextTrackParam before adding new cluster because of the sorting | |
96ebe67e | 1357 | nextTrackParam = (AliMUONTrackParam*)track->GetTrackParamAtCluster()->After(trackParam); |
b709ac13 | 1358 | |
96ebe67e | 1359 | // Create iterators to loop over clusters in current chamber |
1360 | TIter nextInCh(clusterStore.CreateChamberIterator(chamberId,chamberId)); | |
b709ac13 | 1361 | |
1362 | // look for one second candidate in the same chamber | |
96ebe67e | 1363 | while ( ( cluster = static_cast<AliMUONVCluster*>(nextInCh()) ) ) { |
b709ac13 | 1364 | |
1365 | // look for a cluster in another detection element | |
96ebe67e | 1366 | if (cluster->GetDetElemId() == detElemId) continue; |
b709ac13 | 1367 | |
96ebe67e | 1368 | // try to add the current cluster fast |
1369 | if (!TryOneClusterFast(*trackParam, cluster)) continue; | |
b709ac13 | 1370 | |
96ebe67e | 1371 | // try to add the current cluster accurately |
b709ac13 | 1372 | // never use track parameters at last cluster because the covariance matrix is meaningless |
96ebe67e | 1373 | if (nextTrackParam) chi2OfCluster = TryOneCluster(*trackParam, cluster, trackParamAtCluster); |
1374 | else chi2OfCluster = TryOneCluster(*previousTrackParam, cluster, trackParamAtCluster); | |
b709ac13 | 1375 | |
1376 | // if good chi2 then consider to add this cluster to the track | |
96ebe67e | 1377 | if (chi2OfCluster < maxChi2OfCluster) { |
b709ac13 | 1378 | |
96ebe67e | 1379 | // Compute local track parameters including current cluster using kalman filter |
1380 | addChi2TrackAtCluster = RunKalmanFilter(trackParamAtCluster); | |
b709ac13 | 1381 | |
1382 | // keep track of the best cluster | |
96ebe67e | 1383 | if (addChi2TrackAtCluster < bestAddChi2TrackAtCluster) { |
1384 | bestAddChi2TrackAtCluster = addChi2TrackAtCluster; | |
1385 | bestTrackParamAtCluster = trackParamAtCluster; | |
1386 | foundOneCluster = kTRUE; | |
b709ac13 | 1387 | } |
1388 | ||
1389 | } | |
1390 | ||
1391 | } | |
1392 | ||
1393 | // add new cluster if any | |
96ebe67e | 1394 | if (foundOneCluster) { |
0e894e58 | 1395 | |
1396 | // Printout for debuging | |
1397 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
1398 | cout << "ComplementTracks: found one cluster in chamber(1..): " << chamberId+1 << endl; | |
1399 | bestTrackParamAtCluster.GetClusterPtr()->Print(); | |
ad3c6eda | 1400 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 2) || (AliLog::GetGlobalDebugLevel() >= 2)) { |
1401 | cout<<endl<<"Track parameters and covariances at cluster:"<<endl; | |
1402 | bestTrackParamAtCluster.GetParameters().Print(); | |
1403 | bestTrackParamAtCluster.GetCovariances().Print(); | |
1404 | } | |
0e894e58 | 1405 | } |
1406 | ||
7332f213 | 1407 | trackParam->SetRemovable(kTRUE); |
1408 | bestTrackParamAtCluster.SetRemovable(kTRUE); | |
1409 | track->AddTrackParamAtCluster(bestTrackParamAtCluster,*(bestTrackParamAtCluster.GetClusterPtr())); | |
b709ac13 | 1410 | trackModified = kTRUE; |
89c8d66d | 1411 | hasChanged = kTRUE; |
b709ac13 | 1412 | } |
1413 | ||
1414 | previousTrackParam = trackParam; | |
1415 | trackParam = nextTrackParam; | |
1416 | } | |
1417 | ||
4ea3f013 | 1418 | // prepare next track |
1419 | nextTrack = (AliMUONTrack*) fRecTracksPtr->After(track); | |
1420 | ||
b709ac13 | 1421 | // re-compute track parameters using kalman filter if needed |
4ea3f013 | 1422 | if (trackModified && !RetraceTrack(*track,kTRUE)) { |
1423 | AliWarning("track modified but problem occur during refitting --> remove track"); | |
1424 | fRecTracksPtr->Remove(track); | |
1425 | fNRecTracks--; | |
1426 | } | |
b709ac13 | 1427 | |
4ea3f013 | 1428 | track = nextTrack; |
b709ac13 | 1429 | } |
1430 | ||
89c8d66d | 1431 | return hasChanged; |
1432 | ||
b709ac13 | 1433 | } |
1434 | ||
1435 | //__________________________________________________________________________ | |
7332f213 | 1436 | void AliMUONTrackReconstructorK::ImproveTrack(AliMUONTrack &track) |
8cc77df0 | 1437 | { |
7332f213 | 1438 | /// Improve the given track by removing removable clusters with local chi2 highter than the defined cut |
1439 | /// Removable clusters are identified by the method AliMUONTrack::TagRemovableClusters() | |
ea94c18b | 1440 | /// Recompute track parameters and covariances at the remaining clusters |
4ea3f013 | 1441 | /// and if something goes wrong (i.e. extrapolation failed...) set track chi2 to max value |
7332f213 | 1442 | AliDebug(1,"Enter ImproveTrack"); |
ea94c18b | 1443 | |
1444 | Double_t localChi2, worstLocalChi2; | |
ff078154 | 1445 | AliMUONTrackParam *trackParamAtCluster, *worstTrackParamAtCluster, *nextTrackParam, *next2nextTrackParam; |
1446 | Int_t nextChamber, next2nextChamber; | |
ea94c18b | 1447 | Bool_t smoothed; |
a0dc65b4 | 1448 | Double_t sigmaCut2 = GetRecoParam()->GetSigmaCutForImprovement() * |
1449 | GetRecoParam()->GetSigmaCutForImprovement(); | |
ea94c18b | 1450 | |
7332f213 | 1451 | while (!track.IsImproved()) { |
ea94c18b | 1452 | |
7332f213 | 1453 | // identify removable clusters |
a0dc65b4 | 1454 | track.TagRemovableClusters(GetRecoParam()->RequestedStationMask()); |
b709ac13 | 1455 | |
7332f213 | 1456 | // Run smoother if required |
1457 | smoothed = kFALSE; | |
a0dc65b4 | 1458 | if (GetRecoParam()->UseSmoother()) smoothed = RunSmoother(track); |
7332f213 | 1459 | |
1460 | // Use standard procedure to compute local chi2 if smoother not required or not working | |
1461 | if (!smoothed) { | |
ea94c18b | 1462 | |
7332f213 | 1463 | // Update track parameters and covariances |
4ea3f013 | 1464 | if (!track.UpdateCovTrackParamAtCluster()) { |
1465 | AliWarning("unable to update track parameters and covariances --> stop improvement"); | |
1466 | // restore the kalman parameters | |
1467 | RetraceTrack(track,kTRUE); | |
1468 | break; | |
1469 | } | |
ea94c18b | 1470 | |
7332f213 | 1471 | // Compute local chi2 of each clusters |
1472 | track.ComputeLocalChi2(kTRUE); | |
1473 | } | |
1474 | ||
1475 | // Look for the cluster to remove | |
1476 | worstTrackParamAtCluster = 0x0; | |
ff078154 | 1477 | worstLocalChi2 = -1.; |
7332f213 | 1478 | trackParamAtCluster = (AliMUONTrackParam*)track.GetTrackParamAtCluster()->First(); |
1479 | while (trackParamAtCluster) { | |
ea94c18b | 1480 | |
7332f213 | 1481 | // save parameters into smooth parameters in case of smoother did not work properly |
a0dc65b4 | 1482 | if (GetRecoParam()->UseSmoother() && !smoothed) { |
7332f213 | 1483 | trackParamAtCluster->SetSmoothParameters(trackParamAtCluster->GetParameters()); |
1484 | trackParamAtCluster->SetSmoothCovariances(trackParamAtCluster->GetCovariances()); | |
ea94c18b | 1485 | } |
1486 | ||
7332f213 | 1487 | // Pick up cluster with the worst chi2 |
1488 | localChi2 = trackParamAtCluster->GetLocalChi2(); | |
1489 | if (localChi2 > worstLocalChi2) { | |
1490 | worstLocalChi2 = localChi2; | |
1491 | worstTrackParamAtCluster = trackParamAtCluster; | |
ea94c18b | 1492 | } |
1493 | ||
7332f213 | 1494 | trackParamAtCluster = (AliMUONTrackParam*)track.GetTrackParamAtCluster()->After(trackParamAtCluster); |
1495 | } | |
1496 | ||
7332f213 | 1497 | // Check whether the worst chi2 is under requirement or not |
1498 | if (worstLocalChi2 < 2. * sigmaCut2) { // 2 because 2 quantities in chi2 | |
1499 | track.SetImproved(kTRUE); | |
1500 | break; | |
1501 | } | |
1502 | ||
1503 | // if the worst cluster is not removable then stop improvement | |
ff078154 | 1504 | if (!worstTrackParamAtCluster->IsRemovable()) { |
1505 | // restore the kalman parameters in case they have been lost | |
1506 | if (!smoothed) RetraceTrack(track,kTRUE); | |
1507 | break; | |
1508 | } | |
7332f213 | 1509 | |
1510 | // get track parameters at cluster next to the one to be removed | |
1511 | nextTrackParam = (AliMUONTrackParam*) track.GetTrackParamAtCluster()->After(worstTrackParamAtCluster); | |
1512 | ||
1513 | // Remove the worst cluster | |
1514 | track.RemoveTrackParamAtCluster(worstTrackParamAtCluster); | |
1515 | ||
1516 | // Re-calculate track parameters | |
1517 | // - from the cluster immediately downstream the one suppressed | |
1518 | // - or from the begining - if parameters have been re-computed using the standard method (kalman parameters have been lost) | |
ff078154 | 1519 | // - or if the removed cluster was used to compute the tracking seed |
4ea3f013 | 1520 | Bool_t normalExtrap; |
ff078154 | 1521 | if (smoothed && nextTrackParam) { |
1522 | ||
1523 | nextChamber = nextTrackParam->GetClusterPtr()->GetChamberId(); | |
1524 | next2nextTrackParam = nextTrackParam; | |
1525 | do { | |
1526 | ||
1527 | next2nextChamber = next2nextTrackParam->GetClusterPtr()->GetChamberId(); | |
1528 | next2nextTrackParam = (AliMUONTrackParam*) track.GetTrackParamAtCluster()->After(next2nextTrackParam); | |
1529 | ||
1530 | } while (next2nextTrackParam && (next2nextChamber == nextChamber)); | |
1531 | ||
4ea3f013 | 1532 | if (next2nextChamber == nextChamber) normalExtrap = RetraceTrack(track,kTRUE); |
1533 | else normalExtrap = RetracePartialTrack(track,nextTrackParam); | |
ff078154 | 1534 | |
4ea3f013 | 1535 | } else normalExtrap = RetraceTrack(track,kTRUE); |
1536 | ||
1537 | // stop in case of extrapolation problem | |
1538 | if (!normalExtrap) { | |
1539 | AliWarning("track partially improved but problem occur during refitting --> stop improvement"); | |
1540 | break; | |
1541 | } | |
7332f213 | 1542 | |
1543 | // Printout for debuging | |
1544 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
1545 | cout << "ImproveTracks: track " << fRecTracksPtr->IndexOf(&track)+1 << " improved " << endl; | |
ea94c18b | 1546 | } |
1547 | ||
ea94c18b | 1548 | } |
1549 | ||
8cc77df0 | 1550 | } |
1551 | ||
7332f213 | 1552 | //__________________________________________________________________________ |
4ea3f013 | 1553 | Bool_t AliMUONTrackReconstructorK::FinalizeTrack(AliMUONTrack &track) |
b0e4c598 | 1554 | { |
96ebe67e | 1555 | /// Update track parameters and covariances at each attached cluster |
7332f213 | 1556 | /// using smoother if required, if not already done |
4ea3f013 | 1557 | /// return kFALSE if the track cannot be extrapolated uo to the last chamber |
b709ac13 | 1558 | |
96ebe67e | 1559 | AliMUONTrackParam *trackParamAtCluster; |
ea94c18b | 1560 | Bool_t smoothed = kFALSE; |
1561 | ||
7332f213 | 1562 | // update track parameters (using smoother if required) if not already done |
4ea3f013 | 1563 | if (track.IsImproved()) smoothed = GetRecoParam()->UseSmoother(); |
1564 | else { | |
a0dc65b4 | 1565 | if (GetRecoParam()->UseSmoother()) smoothed = RunSmoother(track); |
d1e6fdee | 1566 | if (!smoothed) { |
4ea3f013 | 1567 | if (track.UpdateCovTrackParamAtCluster()) track.ComputeLocalChi2(kTRUE); |
1568 | else { | |
1569 | AliWarning("finalization failed due to extrapolation problem"); | |
1570 | return kFALSE; | |
1571 | } | |
d1e6fdee | 1572 | } |
4ea3f013 | 1573 | } |
7332f213 | 1574 | |
1575 | // copy smoothed parameters and covariances if any | |
1576 | if (smoothed) { | |
ea94c18b | 1577 | |
7332f213 | 1578 | trackParamAtCluster = (AliMUONTrackParam*) (track.GetTrackParamAtCluster()->First()); |
1579 | while (trackParamAtCluster) { | |
ea94c18b | 1580 | |
7332f213 | 1581 | trackParamAtCluster->SetParameters(trackParamAtCluster->GetSmoothParameters()); |
1582 | trackParamAtCluster->SetCovariances(trackParamAtCluster->GetSmoothCovariances()); | |
ea94c18b | 1583 | |
7332f213 | 1584 | trackParamAtCluster = (AliMUONTrackParam*) (track.GetTrackParamAtCluster()->After(trackParamAtCluster)); |
ea94c18b | 1585 | } |
1586 | ||
b0e4c598 | 1587 | } |
7332f213 | 1588 | |
4ea3f013 | 1589 | return kTRUE; |
1590 | ||
7deb8eb0 | 1591 | } |
1592 | ||
1593 | //__________________________________________________________________________ | |
b1fea02e | 1594 | Bool_t AliMUONTrackReconstructorK::RefitTrack(AliMUONTrack &track, Bool_t enableImprovement) |
7deb8eb0 | 1595 | { |
1596 | /// re-fit the given track | |
89c8d66d | 1597 | AliDebug(1,"Enter RefitTrack"); |
7deb8eb0 | 1598 | |
ff078154 | 1599 | // check validity of the track (i.e. at least 2 chambers hit on stations 4 and 5) |
1600 | if (!track.IsValid(0)) { | |
1601 | AliWarning("the track is not valid --> unable to refit"); | |
7deb8eb0 | 1602 | return kFALSE; |
1603 | } | |
1604 | ||
1605 | // re-compute track parameters and covariances using Kalman filter | |
4ea3f013 | 1606 | if (!RetraceTrack(track,kTRUE)) { |
1607 | AliWarning("bad track refitting due to extrapolation failure"); | |
1608 | return kFALSE; | |
1609 | } | |
7deb8eb0 | 1610 | |
1611 | // Improve the reconstructed tracks if required | |
b1fea02e | 1612 | track.SetImproved(kFALSE); |
a0dc65b4 | 1613 | if (enableImprovement && GetRecoParam()->ImproveTracks()) ImproveTrack(track); |
7deb8eb0 | 1614 | |
1615 | // Fill AliMUONTrack data members | |
4ea3f013 | 1616 | if (track.GetGlobalChi2() < AliMUONTrack::MaxChi2()) return FinalizeTrack(track); |
1617 | else { | |
1618 | AliWarning("track not finalized due to extrapolation failure"); | |
1619 | return kFALSE; | |
1620 | } | |
7deb8eb0 | 1621 | |
b0e4c598 | 1622 | } |
ea94c18b | 1623 |