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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 | delete segments; |
127 | return kFALSE; | |
128 | } | |
129 | } else { | |
130 | if ((fNRecTracks + segments->GetEntriesFast() - iSegment - 1) > GetRecoParam()->GetMaxTrackCandidates()) { | |
4ea3f013 | 131 | AliError(Form("Too many track candidates (%d tracks). Stop tracking.", fNRecTracks + segments->GetEntriesFast() - iSegment - 1)); |
6b191dea | 132 | delete segments; |
133 | return kFALSE; | |
134 | } | |
ea94c18b | 135 | } |
136 | ||
137 | } | |
89c8d66d | 138 | |
ea94c18b | 139 | // delete the array of segments |
7ec3b9cf | 140 | delete segments; |
ea94c18b | 141 | } |
142 | ||
89c8d66d | 143 | // Keep all different tracks if required |
144 | if (GetRecoParam()->TrackAllTracks()) RemoveIdenticalTracks(); | |
ea94c18b | 145 | |
89c8d66d | 146 | // Retrace tracks using Kalman filter and select them if needed |
147 | Int_t nCurrentTracks = fRecTracksPtr->GetLast()+1; | |
148 | for (Int_t iRecTrack = 0; iRecTrack < nCurrentTracks; iRecTrack++) { | |
149 | track = (AliMUONTrack*) fRecTracksPtr->UncheckedAt(iRecTrack); | |
ea94c18b | 150 | |
89c8d66d | 151 | // skip empty slots |
152 | if(!track) continue; | |
153 | ||
4ea3f013 | 154 | // retrace tracks using Kalman filter and remove the ones for which extrap failed or that are out of limits |
155 | if (!RetraceTrack(*track,kTRUE) || !IsAcceptable(*((AliMUONTrackParam*)track->GetTrackParamAtCluster()->First()))) { | |
6b191dea | 156 | fRecTracksPtr->Remove(track); |
157 | fNRecTracks--; | |
ea94c18b | 158 | } |
159 | ||
160 | } | |
161 | ||
89c8d66d | 162 | // Keep only the best tracks if required |
163 | if (!GetRecoParam()->TrackAllTracks()) RemoveDoubleTracks(); | |
3e9a7a05 | 164 | else fRecTracksPtr->Compress(); |
ea94c18b | 165 | |
166 | AliDebug(1,Form("Number of good candidates = %d",fNRecTracks)); | |
167 | ||
89c8d66d | 168 | return kTRUE; |
169 | ||
9bf6860b | 170 | } |
171 | ||
172 | //__________________________________________________________________________ | |
89c8d66d | 173 | Bool_t AliMUONTrackReconstructorK::MakeMoreTrackCandidates(AliMUONVClusterStore& clusterStore) |
9bf6860b | 174 | { |
89c8d66d | 175 | /// To make extra track candidates assuming linear propagation: |
9bf6860b | 176 | /// clustering is supposed to be already done |
177 | /// Start with segments made of 1 cluster in each of the stations 4 and 5 then follow track in remaining chambers. | |
89c8d66d | 178 | /// Good candidates are made of at least three clusters if both stations are requested (two otherwise). |
9bf6860b | 179 | /// Keep only best candidates or all of them according to the flag fgkTrackAllTracks. |
180 | ||
181 | TClonesArray *segments; | |
89c8d66d | 182 | AliMUONObjectPair *segment; |
9bf6860b | 183 | AliMUONTrack *track; |
184 | Int_t iCandidate = 0, iCurrentTrack, nCurrentTracks; | |
185 | Int_t initialNRecTracks = fNRecTracks; | |
186 | Bool_t clusterFound; | |
187 | ||
188 | AliDebug(1,"Enter MakeMoreTrackCandidates"); | |
189 | ||
190 | // Double loop over chambers in stations(1..) 4 and 5 to make track candidates | |
191 | for (Int_t ich1 = 6; ich1 <= 7; ich1++) { | |
192 | for (Int_t ich2 = 8; ich2 <= 9; ich2++) { | |
193 | ||
194 | // Make segments between ch1 and ch2 | |
195 | segments = MakeSegmentsBetweenChambers(clusterStore, ich1, ich2); | |
196 | ||
89c8d66d | 197 | /// Remove segments already attached to a track |
198 | RemoveUsedSegments(*segments); | |
199 | ||
9bf6860b | 200 | // Loop over segments |
89c8d66d | 201 | for (Int_t iSegment=0; iSegment<segments->GetEntriesFast(); iSegment++) { |
9bf6860b | 202 | AliDebug(1,Form("Making primary candidate(1..) %d",++iCandidate)); |
89c8d66d | 203 | segment = (AliMUONObjectPair*) segments->UncheckedAt(iSegment); |
9bf6860b | 204 | |
205 | // Transform segments to tracks and put them at the end of fRecTracksPtr | |
206 | iCurrentTrack = fRecTracksPtr->GetLast()+1; | |
89c8d66d | 207 | track = new ((*fRecTracksPtr)[iCurrentTrack]) AliMUONTrack(segment,GetRecoParam()->GetBendingVertexDispersion()); |
9bf6860b | 208 | fNRecTracks++; |
209 | ||
210 | // Look for compatible cluster(s) in the second chamber of station 5 | |
89c8d66d | 211 | clusterFound = FollowLinearTrackInChamber(*track, clusterStore, 17-ich2); |
9bf6860b | 212 | |
213 | // skip the original track in case it has been removed | |
a0dc65b4 | 214 | if (GetRecoParam()->TrackAllTracks() && clusterFound) iCurrentTrack++; |
9bf6860b | 215 | |
216 | // loop over every new tracks | |
217 | nCurrentTracks = fRecTracksPtr->GetLast()+1; | |
218 | while (iCurrentTrack < nCurrentTracks) { | |
219 | track = (AliMUONTrack*) fRecTracksPtr->UncheckedAt(iCurrentTrack); | |
220 | ||
221 | // Look for compatible cluster(s) in the second chamber of station 4 | |
89c8d66d | 222 | FollowLinearTrackInChamber(*track, clusterStore, 13-ich1); |
9bf6860b | 223 | |
224 | iCurrentTrack++; | |
225 | } | |
226 | ||
89c8d66d | 227 | // abort tracking if there are too many candidates |
6b191dea | 228 | if ((fNRecTracks + segments->GetEntriesFast() - iSegment - 1) > GetRecoParam()->GetMaxTrackCandidates()) { |
87976389 | 229 | AliError(Form("Too many track candidates (%d tracks). Stop tracking.", fNRecTracks + segments->GetEntriesFast() - iSegment - 1)); |
89c8d66d | 230 | delete segments; |
231 | return kFALSE; | |
232 | } | |
233 | ||
9bf6860b | 234 | } |
235 | ||
236 | // delete the array of segments | |
237 | delete segments; | |
238 | } | |
239 | } | |
240 | ||
89c8d66d | 241 | // Retrace tracks using Kalman filter (also compute track chi2) and select them |
242 | nCurrentTracks = fRecTracksPtr->GetLast()+1; | |
243 | for (Int_t iRecTrack = initialNRecTracks; iRecTrack < nCurrentTracks; iRecTrack++) { | |
9bf6860b | 244 | track = (AliMUONTrack*) fRecTracksPtr->UncheckedAt(iRecTrack); |
245 | ||
89c8d66d | 246 | // skip empty slots |
247 | if(!track) continue; | |
248 | ||
4ea3f013 | 249 | // retrace tracks using Kalman filter and remove the ones for which extrap failed or that are out of limits |
250 | if (!RetraceTrack(*track,kTRUE) || !IsAcceptable(*((AliMUONTrackParam*)track->GetTrackParamAtCluster()->First()))) { | |
6b191dea | 251 | fRecTracksPtr->Remove(track); |
252 | fNRecTracks--; | |
9bf6860b | 253 | } |
254 | ||
255 | } | |
256 | ||
89c8d66d | 257 | // Keep only the best tracks if required |
258 | if (!GetRecoParam()->TrackAllTracks()) RemoveDoubleTracks(); | |
259 | else fRecTracksPtr->Compress(); | |
9bf6860b | 260 | |
261 | AliDebug(1,Form("Number of good candidates = %d",fNRecTracks)); | |
262 | ||
89c8d66d | 263 | return kTRUE; |
264 | ||
8cc77df0 | 265 | } |
266 | ||
ea94c18b | 267 | //__________________________________________________________________________ |
4ea3f013 | 268 | Bool_t AliMUONTrackReconstructorK::RetraceTrack(AliMUONTrack &trackCandidate, Bool_t resetSeed) |
8cc77df0 | 269 | { |
96ebe67e | 270 | /// Re-run the kalman filter from the most downstream cluster to the most uptream one |
4ea3f013 | 271 | /// Return kFALSE in case of failure (i.e. extrapolation problem) |
ea94c18b | 272 | AliDebug(1,"Enter RetraceTrack"); |
273 | ||
7332f213 | 274 | AliMUONTrackParam* lastTrackParam = (AliMUONTrackParam*) trackCandidate.GetTrackParamAtCluster()->Last(); |
ea94c18b | 275 | |
96ebe67e | 276 | // Reset the "seed" (= track parameters and their covariances at last cluster) if required |
ea94c18b | 277 | if (resetSeed) { |
7332f213 | 278 | |
279 | // parameters at last cluster | |
280 | AliMUONVCluster* cluster2 = lastTrackParam->GetClusterPtr(); | |
281 | Double_t x2 = cluster2->GetX(); | |
282 | Double_t y2 = cluster2->GetY(); | |
283 | Double_t z2 = cluster2->GetZ(); | |
284 | ||
285 | // parameters at last but one cluster | |
286 | AliMUONTrackParam* previousTrackParam = (AliMUONTrackParam*) trackCandidate.GetTrackParamAtCluster()->Before(lastTrackParam); | |
287 | AliMUONVCluster* cluster1 = previousTrackParam->GetClusterPtr(); | |
0e894e58 | 288 | // make sure it is on the previous chamber (can have 2 clusters in the same chamber after "ComplementTrack") |
289 | if (cluster2->GetChamberId() == cluster1->GetChamberId()) { | |
290 | previousTrackParam = (AliMUONTrackParam*) trackCandidate.GetTrackParamAtCluster()->Before(previousTrackParam); | |
291 | cluster1 = previousTrackParam->GetClusterPtr(); | |
292 | } | |
7332f213 | 293 | Double_t x1 = cluster1->GetX(); |
294 | Double_t y1 = cluster1->GetY(); | |
295 | Double_t z1 = cluster1->GetZ(); | |
296 | ||
297 | // reset track parameters | |
298 | Double_t dZ = z1 - z2; | |
299 | lastTrackParam->SetNonBendingCoor(x2); | |
300 | lastTrackParam->SetBendingCoor(y2); | |
301 | lastTrackParam->SetZ(z2); | |
302 | lastTrackParam->SetNonBendingSlope((x1 - x2) / dZ); | |
303 | lastTrackParam->SetBendingSlope((y1 - y2) / dZ); | |
304 | Double_t bendingImpact = y2 - z2 * lastTrackParam->GetBendingSlope(); | |
9bf6860b | 305 | Double_t inverseBendingMomentum = 1. / AliMUONTrackExtrap::GetBendingMomentumFromImpactParam(bendingImpact); |
306 | lastTrackParam->SetInverseBendingMomentum(inverseBendingMomentum); | |
7332f213 | 307 | |
308 | // => Reset track parameter covariances at last cluster (as if the other clusters did not exist) | |
309 | TMatrixD lastParamCov(5,5); | |
310 | lastParamCov.Zero(); | |
ea94c18b | 311 | // Non bending plane |
7332f213 | 312 | lastParamCov(0,0) = cluster2->GetErrX2(); |
89c8d66d | 313 | lastParamCov(0,1) = - cluster2->GetErrX2() / dZ; |
314 | lastParamCov(1,0) = lastParamCov(0,1); | |
315 | lastParamCov(1,1) = ( 1000. * cluster1->GetErrX2() + cluster2->GetErrX2() ) / dZ / dZ; | |
ea94c18b | 316 | // Bending plane |
7332f213 | 317 | lastParamCov(2,2) = cluster2->GetErrY2(); |
89c8d66d | 318 | lastParamCov(2,3) = - cluster2->GetErrY2() / dZ; |
319 | lastParamCov(3,2) = lastParamCov(2,3); | |
320 | lastParamCov(3,3) = ( 1000. * cluster1->GetErrY2() + cluster2->GetErrY2() ) / dZ / dZ; | |
9bf6860b | 321 | // Inverse bending momentum (vertex resolution + bending slope resolution + 10% error on dipole parameters+field) |
89c8d66d | 322 | if (AliMUONTrackExtrap::IsFieldON()) { |
323 | lastParamCov(4,4) = ((GetRecoParam()->GetBendingVertexDispersion() * | |
324 | GetRecoParam()->GetBendingVertexDispersion() + | |
325 | (z1 * z1 * cluster2->GetErrY2() + z2 * z2 * 1000. * cluster1->GetErrY2()) / dZ / dZ) / | |
326 | bendingImpact / bendingImpact + 0.1 * 0.1) * inverseBendingMomentum * inverseBendingMomentum; | |
327 | lastParamCov(2,4) = z1 * cluster2->GetErrY2() * inverseBendingMomentum / bendingImpact / dZ; | |
328 | lastParamCov(4,2) = lastParamCov(2,4); | |
329 | lastParamCov(3,4) = - (z1 * cluster2->GetErrY2() + z2 * 1000. * cluster1->GetErrY2()) * | |
330 | inverseBendingMomentum / bendingImpact / dZ / dZ; | |
331 | lastParamCov(4,3) = lastParamCov(3,4); | |
332 | } else lastParamCov(4,4) = inverseBendingMomentum*inverseBendingMomentum; | |
7332f213 | 333 | lastTrackParam->SetCovariances(lastParamCov); |
ea94c18b | 334 | |
335 | // Reset the track chi2 | |
7332f213 | 336 | lastTrackParam->SetTrackChi2(0.); |
ea94c18b | 337 | |
338 | } | |
339 | ||
340 | // Redo the tracking | |
4ea3f013 | 341 | return RetracePartialTrack(trackCandidate, lastTrackParam); |
ea94c18b | 342 | |
343 | } | |
8cc77df0 | 344 | |
ea94c18b | 345 | //__________________________________________________________________________ |
4ea3f013 | 346 | Bool_t AliMUONTrackReconstructorK::RetracePartialTrack(AliMUONTrack &trackCandidate, const AliMUONTrackParam* startingTrackParam) |
ea94c18b | 347 | { |
96ebe67e | 348 | /// Re-run the kalman filter from the cluster attached to startingTrackParam to the most uptream cluster |
4ea3f013 | 349 | /// Return kFALSE in case of failure (i.e. extrapolation problem) |
ea94c18b | 350 | AliDebug(1,"Enter RetracePartialTrack"); |
351 | ||
352 | // Printout for debuging | |
353 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
96ebe67e | 354 | cout << "RetracePartialTrack: track chi2 before re-tracking: " << trackCandidate.GetGlobalChi2() << endl; |
ea94c18b | 355 | } |
356 | ||
357 | // Reset the track chi2 | |
96ebe67e | 358 | trackCandidate.SetGlobalChi2(startingTrackParam->GetTrackChi2()); |
ea94c18b | 359 | |
96ebe67e | 360 | // loop over attached clusters until the first one and recompute track parameters and covariances using kalman filter |
4ea3f013 | 361 | Bool_t extrapStatus = kTRUE; |
96ebe67e | 362 | Int_t expectedChamber = startingTrackParam->GetClusterPtr()->GetChamberId() - 1; |
ea94c18b | 363 | Int_t currentChamber; |
96ebe67e | 364 | Double_t addChi2TrackAtCluster; |
365 | AliMUONTrackParam* trackParamAtCluster = (AliMUONTrackParam*) trackCandidate.GetTrackParamAtCluster()->Before(startingTrackParam); | |
366 | while (trackParamAtCluster) { | |
ea94c18b | 367 | |
368 | // reset track parameters and their covariances | |
96ebe67e | 369 | trackParamAtCluster->SetParameters(startingTrackParam->GetParameters()); |
370 | trackParamAtCluster->SetZ(startingTrackParam->GetZ()); | |
371 | trackParamAtCluster->SetCovariances(startingTrackParam->GetCovariances()); | |
ea94c18b | 372 | |
373 | // add MCS effect | |
4663da9f | 374 | AliMUONTrackExtrap::AddMCSEffect(trackParamAtCluster,AliMUONConstants::ChamberThicknessInX0(expectedChamber+1),-1.); |
ea94c18b | 375 | |
376 | // reset propagator for smoother | |
a0dc65b4 | 377 | if (GetRecoParam()->UseSmoother()) trackParamAtCluster->ResetPropagator(); |
ea94c18b | 378 | |
9bf6860b | 379 | // add MCS in missing chambers if any |
96ebe67e | 380 | currentChamber = trackParamAtCluster->GetClusterPtr()->GetChamberId(); |
ea94c18b | 381 | while (currentChamber < expectedChamber) { |
382 | // extrapolation to the missing chamber (update the propagator) | |
4ea3f013 | 383 | if (!AliMUONTrackExtrap::ExtrapToZCov(trackParamAtCluster, AliMUONConstants::DefaultChamberZ(expectedChamber), |
384 | GetRecoParam()->UseSmoother())) extrapStatus = kFALSE; | |
ea94c18b | 385 | // add MCS effect |
4663da9f | 386 | AliMUONTrackExtrap::AddMCSEffect(trackParamAtCluster,AliMUONConstants::ChamberThicknessInX0(expectedChamber),-1.); |
ea94c18b | 387 | expectedChamber--; |
388 | } | |
389 | ||
96ebe67e | 390 | // extrapolation to the plane of the cluster attached to the current trackParamAtCluster (update the propagator) |
4ea3f013 | 391 | if (!AliMUONTrackExtrap::ExtrapToZCov(trackParamAtCluster, trackParamAtCluster->GetClusterPtr()->GetZ(), |
392 | GetRecoParam()->UseSmoother())) extrapStatus = kFALSE; | |
ea94c18b | 393 | |
a0dc65b4 | 394 | if (GetRecoParam()->UseSmoother()) { |
ea94c18b | 395 | // save extrapolated parameters for smoother |
96ebe67e | 396 | trackParamAtCluster->SetExtrapParameters(trackParamAtCluster->GetParameters()); |
ea94c18b | 397 | |
398 | // save extrapolated covariance matrix for smoother | |
96ebe67e | 399 | trackParamAtCluster->SetExtrapCovariances(trackParamAtCluster->GetCovariances()); |
ea94c18b | 400 | } |
401 | ||
9bf6860b | 402 | // Compute new track parameters using kalman filter |
96ebe67e | 403 | addChi2TrackAtCluster = RunKalmanFilter(*trackParamAtCluster); |
ea94c18b | 404 | |
405 | // Update the track chi2 | |
96ebe67e | 406 | trackCandidate.SetGlobalChi2(trackCandidate.GetGlobalChi2() + addChi2TrackAtCluster); |
407 | trackParamAtCluster->SetTrackChi2(trackCandidate.GetGlobalChi2()); | |
ea94c18b | 408 | |
96ebe67e | 409 | // prepare next step |
410 | expectedChamber = currentChamber - 1; | |
411 | startingTrackParam = trackParamAtCluster; | |
412 | trackParamAtCluster = (AliMUONTrackParam*) (trackCandidate.GetTrackParamAtCluster()->Before(startingTrackParam)); | |
ea94c18b | 413 | } |
414 | ||
415 | // Printout for debuging | |
416 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
96ebe67e | 417 | cout << "RetracePartialTrack: track chi2 after re-tracking: " << trackCandidate.GetGlobalChi2() << endl; |
ea94c18b | 418 | } |
419 | ||
4ea3f013 | 420 | // set global chi2 to max value in case of problem during track extrapolation |
421 | if (!extrapStatus) trackCandidate.SetGlobalChi2(2.*AliMUONTrack::MaxChi2()); | |
422 | return extrapStatus; | |
423 | ||
ea94c18b | 424 | } |
8cc77df0 | 425 | |
ea94c18b | 426 | //__________________________________________________________________________ |
89c8d66d | 427 | Bool_t AliMUONTrackReconstructorK::FollowTracks(AliMUONVClusterStore& clusterStore) |
ea94c18b | 428 | { |
429 | /// Follow tracks in stations(1..) 3, 2 and 1 | |
430 | AliDebug(1,"Enter FollowTracks"); | |
431 | ||
432 | AliMUONTrack *track; | |
433 | Int_t currentNRecTracks; | |
ea94c18b | 434 | |
435 | for (Int_t station = 2; station >= 0; station--) { | |
436 | ||
437 | // Save the actual number of reconstructed track in case of | |
438 | // tracks are added or suppressed during the tracking procedure | |
439 | // !! Do not compress fRecTracksPtr until the end of the loop over tracks !! | |
440 | currentNRecTracks = fNRecTracks; | |
441 | ||
442 | for (Int_t iRecTrack = 0; iRecTrack <currentNRecTracks; iRecTrack++) { | |
443 | AliDebug(1,Form("FollowTracks: track candidate(1..) %d", iRecTrack+1)); | |
444 | ||
445 | track = (AliMUONTrack*) fRecTracksPtr->UncheckedAt(iRecTrack); | |
446 | ||
96ebe67e | 447 | // Look for compatible cluster(s) in station(0..) "station" |
9bf6860b | 448 | if (!FollowTrackInStation(*track, clusterStore, station)) { |
449 | ||
450 | // Try to recover track if required | |
a0dc65b4 | 451 | if (GetRecoParam()->RecoverTracks()) { |
9bf6860b | 452 | |
453 | // work on a copy of the track if this station is not required | |
454 | // to keep the case where no cluster is reconstructed as a possible candidate | |
a0dc65b4 | 455 | if (!GetRecoParam()->RequestStation(station)) { |
9bf6860b | 456 | track = new ((*fRecTracksPtr)[fRecTracksPtr->GetLast()+1]) AliMUONTrack(*track); |
457 | fNRecTracks++; | |
458 | } | |
459 | ||
460 | // try to recover | |
461 | if (!RecoverTrack(*track, clusterStore, station)) { | |
462 | // remove track if no cluster found | |
463 | fRecTracksPtr->Remove(track); | |
464 | fNRecTracks--; | |
465 | } | |
466 | ||
a0dc65b4 | 467 | } else if (GetRecoParam()->RequestStation(station)) { |
9bf6860b | 468 | // remove track if no cluster found |
469 | fRecTracksPtr->Remove(track); | |
470 | fNRecTracks--; | |
471 | } | |
472 | ||
8cc77df0 | 473 | } |
ea94c18b | 474 | |
89c8d66d | 475 | // abort tracking if there are too many candidates |
6b191dea | 476 | if (GetRecoParam()->RequestStation(station)) { |
477 | if (fNRecTracks > GetRecoParam()->GetMaxTrackCandidates()) { | |
87976389 | 478 | AliError(Form("Too many track candidates (%d tracks). Stop tracking.", fNRecTracks)); |
6b191dea | 479 | return kFALSE; |
480 | } | |
481 | } else { | |
482 | if ((fNRecTracks + currentNRecTracks - iRecTrack - 1) > GetRecoParam()->GetMaxTrackCandidates()) { | |
87976389 | 483 | AliError(Form("Too many track candidates (%d tracks). Stop tracking.", fNRecTracks + currentNRecTracks - iRecTrack - 1)); |
6b191dea | 484 | return kFALSE; |
485 | } | |
89c8d66d | 486 | } |
487 | ||
8cc77df0 | 488 | } |
ea94c18b | 489 | |
490 | fRecTracksPtr->Compress(); // this is essential before checking tracks | |
491 | ||
ea94c18b | 492 | // Keep only the best tracks if required |
a0dc65b4 | 493 | if (!GetRecoParam()->TrackAllTracks()) RemoveDoubleTracks(); |
ea94c18b | 494 | |
495 | } | |
496 | ||
89c8d66d | 497 | return kTRUE; |
498 | ||
9bf6860b | 499 | } |
500 | ||
501 | //__________________________________________________________________________ | |
502 | Bool_t AliMUONTrackReconstructorK::FollowTrackInChamber(AliMUONTrack &trackCandidate, AliMUONVClusterStore& clusterStore, Int_t nextChamber) | |
503 | { | |
504 | /// Follow trackCandidate in chamber(0..) nextChamber and search for compatible cluster(s) | |
505 | /// Keep all possibilities or only the best one(s) according to the flag fgkTrackAllTracks: | |
506 | /// kTRUE: duplicate "trackCandidate" if there are several possibilities and add the new tracks at the end of | |
507 | /// fRecTracksPtr to avoid conficts with other track candidates at this current stage of the tracking procedure. | |
508 | /// Remove the obsolete "trackCandidate" at the end. | |
509 | /// kFALSE: add only the best cluster(s) to the "trackCandidate". Try to add a couple of clusters in priority. | |
510 | /// return kTRUE if new cluster(s) have been found (otherwise return kFALSE) | |
511 | AliDebug(1,Form("Enter FollowTrackInChamber(1..) %d", nextChamber+1)); | |
512 | ||
9bf6860b | 513 | Double_t chi2OfCluster; |
a0dc65b4 | 514 | Double_t maxChi2OfCluster = 2. * GetRecoParam()->GetSigmaCutForTracking() * |
515 | GetRecoParam()->GetSigmaCutForTracking(); // 2 because 2 quantities in chi2 | |
9bf6860b | 516 | Double_t addChi2TrackAtCluster; |
4ea3f013 | 517 | Double_t bestAddChi2TrackAtCluster = AliMUONTrack::MaxChi2(); |
9bf6860b | 518 | Bool_t foundOneCluster = kFALSE; |
519 | AliMUONTrack *newTrack = 0x0; | |
520 | AliMUONVCluster *cluster; | |
521 | AliMUONTrackParam extrapTrackParamAtCh; | |
522 | AliMUONTrackParam extrapTrackParamAtCluster; | |
523 | AliMUONTrackParam bestTrackParamAtCluster; | |
524 | ||
525 | // Get track parameters according to the propagation direction | |
526 | if (nextChamber > 7) extrapTrackParamAtCh = *(AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->Last(); | |
527 | else extrapTrackParamAtCh = *(AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->First(); | |
528 | ||
529 | // Printout for debuging | |
530 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 2) || (AliLog::GetGlobalDebugLevel() >= 2)) { | |
531 | cout<<endl<<"Track parameters and covariances at first cluster:"<<endl; | |
532 | extrapTrackParamAtCh.GetParameters().Print(); | |
533 | extrapTrackParamAtCh.GetCovariances().Print(); | |
534 | } | |
535 | ||
536 | // Add MCS effect | |
4663da9f | 537 | Int_t currentChamber = extrapTrackParamAtCh.GetClusterPtr()->GetChamberId(); |
538 | AliMUONTrackExtrap::AddMCSEffect(&extrapTrackParamAtCh,AliMUONConstants::ChamberThicknessInX0(currentChamber),-1.); | |
9bf6860b | 539 | |
540 | // reset propagator for smoother | |
a0dc65b4 | 541 | if (GetRecoParam()->UseSmoother()) extrapTrackParamAtCh.ResetPropagator(); |
9bf6860b | 542 | |
543 | // Add MCS in the missing chamber(s) if any | |
9bf6860b | 544 | while (currentChamber > nextChamber + 1) { |
545 | // extrapolation to the missing chamber | |
546 | currentChamber--; | |
4ea3f013 | 547 | if (!AliMUONTrackExtrap::ExtrapToZCov(&extrapTrackParamAtCh, AliMUONConstants::DefaultChamberZ(currentChamber), |
548 | GetRecoParam()->UseSmoother())) return kFALSE; | |
9bf6860b | 549 | // add MCS effect |
4663da9f | 550 | AliMUONTrackExtrap::AddMCSEffect(&extrapTrackParamAtCh,AliMUONConstants::ChamberThicknessInX0(currentChamber),-1.); |
9bf6860b | 551 | } |
552 | ||
553 | //Extrapolate trackCandidate to chamber | |
4ea3f013 | 554 | if (!AliMUONTrackExtrap::ExtrapToZCov(&extrapTrackParamAtCh, AliMUONConstants::DefaultChamberZ(nextChamber), |
555 | GetRecoParam()->UseSmoother())) return kFALSE; | |
9bf6860b | 556 | |
557 | // Printout for debuging | |
558 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 2) || (AliLog::GetGlobalDebugLevel() >= 2)) { | |
559 | cout<<endl<<"Track parameters and covariances at first cluster extrapolated to z = "<<AliMUONConstants::DefaultChamberZ(nextChamber)<<":"<<endl; | |
560 | extrapTrackParamAtCh.GetParameters().Print(); | |
561 | extrapTrackParamAtCh.GetCovariances().Print(); | |
562 | } | |
563 | ||
564 | // Printout for debuging | |
565 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
566 | cout << "FollowTrackInChamber: look for clusters in chamber(1..): " << nextChamber+1 << endl; | |
567 | } | |
568 | ||
569 | // Ask the clustering to reconstruct new clusters around the track position in the current chamber | |
570 | // except for station 4 and 5 that are already entirely clusterized | |
a0dc65b4 | 571 | if (GetRecoParam()->CombineClusterTrackReco()) { |
9bf6860b | 572 | if (nextChamber < 6) AskForNewClustersInChamber(extrapTrackParamAtCh, clusterStore, nextChamber); |
573 | } | |
574 | ||
575 | // Create iterators to loop over clusters in both chambers | |
576 | TIter next(clusterStore.CreateChamberIterator(nextChamber,nextChamber)); | |
577 | ||
578 | // look for candidates in chamber | |
579 | while ( ( cluster = static_cast<AliMUONVCluster*>(next()) ) ) { | |
580 | ||
581 | // try to add the current cluster fast | |
582 | if (!TryOneClusterFast(extrapTrackParamAtCh, cluster)) continue; | |
583 | ||
584 | // try to add the current cluster accuratly | |
585 | chi2OfCluster = TryOneCluster(extrapTrackParamAtCh, cluster, extrapTrackParamAtCluster, | |
a0dc65b4 | 586 | GetRecoParam()->UseSmoother()); |
9bf6860b | 587 | |
588 | // if good chi2 then consider to add cluster | |
589 | if (chi2OfCluster < maxChi2OfCluster) { | |
9bf6860b | 590 | |
a0dc65b4 | 591 | if (GetRecoParam()->UseSmoother()) { |
9bf6860b | 592 | // save extrapolated parameters for smoother |
593 | extrapTrackParamAtCluster.SetExtrapParameters(extrapTrackParamAtCluster.GetParameters()); | |
594 | ||
595 | // save extrapolated covariance matrix for smoother | |
596 | extrapTrackParamAtCluster.SetExtrapCovariances(extrapTrackParamAtCluster.GetCovariances()); | |
597 | } | |
598 | ||
599 | // Compute new track parameters including new cluster using kalman filter | |
600 | addChi2TrackAtCluster = RunKalmanFilter(extrapTrackParamAtCluster); | |
601 | ||
6b191dea | 602 | // skip track out of limits |
603 | if (!IsAcceptable(extrapTrackParamAtCluster)) continue; | |
89c8d66d | 604 | |
605 | // remember a cluster was found | |
606 | foundOneCluster = kTRUE; | |
607 | ||
608 | // Printout for debuging | |
609 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
610 | cout << "FollowTrackInChamber: found one cluster in chamber(1..): " << nextChamber+1 | |
611 | << " (Chi2 = " << chi2OfCluster << ")" << endl; | |
612 | cluster->Print(); | |
613 | } | |
9bf6860b | 614 | |
a0dc65b4 | 615 | if (GetRecoParam()->TrackAllTracks()) { |
9bf6860b | 616 | // copy trackCandidate into a new track put at the end of fRecTracksPtr and add the new cluster |
617 | newTrack = new ((*fRecTracksPtr)[fRecTracksPtr->GetLast()+1]) AliMUONTrack(trackCandidate); | |
618 | UpdateTrack(*newTrack,extrapTrackParamAtCluster,addChi2TrackAtCluster); | |
619 | fNRecTracks++; | |
620 | ||
621 | // Printout for debuging | |
622 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
623 | cout << "FollowTrackInChamber: added one cluster in chamber(1..): " << nextChamber+1 << endl; | |
624 | if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump(); | |
625 | } | |
626 | ||
627 | } else if (addChi2TrackAtCluster < bestAddChi2TrackAtCluster) { | |
628 | // keep track of the best cluster | |
629 | bestAddChi2TrackAtCluster = addChi2TrackAtCluster; | |
630 | bestTrackParamAtCluster = extrapTrackParamAtCluster; | |
631 | } | |
632 | ||
633 | } | |
634 | ||
635 | } | |
636 | ||
637 | // fill out the best track if required else clean up the fRecTracksPtr array | |
a0dc65b4 | 638 | if (!GetRecoParam()->TrackAllTracks()) { |
9bf6860b | 639 | if (foundOneCluster) { |
640 | UpdateTrack(trackCandidate,bestTrackParamAtCluster,bestAddChi2TrackAtCluster); | |
641 | ||
642 | // Printout for debuging | |
643 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
644 | cout << "FollowTrackInChamber: added the best cluster in chamber(1..): " << bestTrackParamAtCluster.GetClusterPtr()->GetChamberId()+1 << endl; | |
645 | if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump(); | |
646 | } | |
647 | ||
648 | } else return kFALSE; | |
649 | ||
650 | } else if (foundOneCluster) { | |
651 | ||
652 | // remove obsolete track | |
653 | fRecTracksPtr->Remove(&trackCandidate); | |
654 | fNRecTracks--; | |
655 | ||
656 | } else return kFALSE; | |
657 | ||
658 | return kTRUE; | |
659 | ||
ea94c18b | 660 | } |
b0e4c598 | 661 | |
ea94c18b | 662 | //__________________________________________________________________________ |
1fef78c8 | 663 | Bool_t AliMUONTrackReconstructorK::FollowTrackInStation(AliMUONTrack &trackCandidate, AliMUONVClusterStore& clusterStore, Int_t nextStation) |
ea94c18b | 664 | { |
96ebe67e | 665 | /// Follow trackCandidate in station(0..) nextStation and search for compatible cluster(s) |
ea94c18b | 666 | /// Keep all possibilities or only the best one(s) according to the flag fgkTrackAllTracks: |
667 | /// kTRUE: duplicate "trackCandidate" if there are several possibilities and add the new tracks at the end of | |
668 | /// fRecTracksPtr to avoid conficts with other track candidates at this current stage of the tracking procedure. | |
669 | /// Remove the obsolete "trackCandidate" at the end. | |
96ebe67e | 670 | /// kFALSE: add only the best cluster(s) to the "trackCandidate". Try to add a couple of clusters in priority. |
671 | /// return kTRUE if new cluster(s) have been found (otherwise return kFALSE) | |
ea94c18b | 672 | AliDebug(1,Form("Enter FollowTrackInStation(1..) %d", nextStation+1)); |
673 | ||
674 | // Order the chamber according to the propagation direction (tracking starts with chamber 2): | |
675 | // - nextStation == station(1...) 5 => forward propagation | |
676 | // - nextStation < station(1...) 5 => backward propagation | |
677 | Int_t ch1, ch2; | |
678 | if (nextStation==4) { | |
679 | ch1 = 2*nextStation+1; | |
680 | ch2 = 2*nextStation; | |
681 | } else { | |
682 | ch1 = 2*nextStation; | |
683 | ch2 = 2*nextStation+1; | |
684 | } | |
685 | ||
96ebe67e | 686 | Double_t chi2OfCluster; |
a0dc65b4 | 687 | Double_t maxChi2OfCluster = 2. * GetRecoParam()->GetSigmaCutForTracking() * |
688 | GetRecoParam()->GetSigmaCutForTracking(); // 2 because 2 quantities in chi2 | |
96ebe67e | 689 | Double_t addChi2TrackAtCluster1; |
690 | Double_t addChi2TrackAtCluster2; | |
4ea3f013 | 691 | Double_t bestAddChi2TrackAtCluster1 = AliMUONTrack::MaxChi2(); |
692 | Double_t bestAddChi2TrackAtCluster2 = AliMUONTrack::MaxChi2(); | |
96ebe67e | 693 | Bool_t foundOneCluster = kFALSE; |
694 | Bool_t foundTwoClusters = kFALSE; | |
ea94c18b | 695 | AliMUONTrack *newTrack = 0x0; |
96ebe67e | 696 | AliMUONVCluster *clusterCh1, *clusterCh2; |
ea94c18b | 697 | AliMUONTrackParam extrapTrackParam; |
7332f213 | 698 | AliMUONTrackParam extrapTrackParamAtCh; |
96ebe67e | 699 | AliMUONTrackParam extrapTrackParamAtCluster1; |
700 | AliMUONTrackParam extrapTrackParamAtCluster2; | |
701 | AliMUONTrackParam bestTrackParamAtCluster1; | |
702 | AliMUONTrackParam bestTrackParamAtCluster2; | |
703 | ||
7332f213 | 704 | // Get track parameters according to the propagation direction |
7332f213 | 705 | if (nextStation==4) extrapTrackParamAtCh = *(AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->Last(); |
706 | else extrapTrackParamAtCh = *(AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->First(); | |
ea94c18b | 707 | |
9bf6860b | 708 | // Printout for debuging |
709 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 2) || (AliLog::GetGlobalDebugLevel() >= 2)) { | |
710 | cout<<endl<<"Track parameters and covariances at first cluster:"<<endl; | |
711 | extrapTrackParamAtCh.GetParameters().Print(); | |
712 | extrapTrackParamAtCh.GetCovariances().Print(); | |
713 | } | |
714 | ||
ea94c18b | 715 | // Add MCS effect |
4663da9f | 716 | Int_t currentChamber = extrapTrackParamAtCh.GetClusterPtr()->GetChamberId(); |
717 | AliMUONTrackExtrap::AddMCSEffect(&extrapTrackParamAtCh,AliMUONConstants::ChamberThicknessInX0(currentChamber),-1.); | |
ea94c18b | 718 | |
719 | // reset propagator for smoother | |
a0dc65b4 | 720 | if (GetRecoParam()->UseSmoother()) extrapTrackParamAtCh.ResetPropagator(); |
ea94c18b | 721 | |
9bf6860b | 722 | // Add MCS in the missing chamber(s) if any |
9bf6860b | 723 | while (ch1 < ch2 && currentChamber > ch2 + 1) { |
ea94c18b | 724 | // extrapolation to the missing chamber |
9bf6860b | 725 | currentChamber--; |
4ea3f013 | 726 | if (!AliMUONTrackExtrap::ExtrapToZCov(&extrapTrackParamAtCh, AliMUONConstants::DefaultChamberZ(currentChamber), |
727 | GetRecoParam()->UseSmoother())) return kFALSE; | |
ea94c18b | 728 | // add MCS effect |
4663da9f | 729 | AliMUONTrackExtrap::AddMCSEffect(&extrapTrackParamAtCh,AliMUONConstants::ChamberThicknessInX0(currentChamber),-1.); |
ea94c18b | 730 | } |
731 | ||
732 | //Extrapolate trackCandidate to chamber "ch2" | |
4ea3f013 | 733 | if (!AliMUONTrackExtrap::ExtrapToZCov(&extrapTrackParamAtCh, AliMUONConstants::DefaultChamberZ(ch2), |
734 | GetRecoParam()->UseSmoother())) return kFALSE; | |
ea94c18b | 735 | |
736 | // Printout for debuging | |
737 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 2) || (AliLog::GetGlobalDebugLevel() >= 2)) { | |
9bf6860b | 738 | cout<<endl<<"Track parameters and covariances at first cluster extrapolated to z = "<<AliMUONConstants::DefaultChamberZ(ch2)<<":"<<endl; |
739 | extrapTrackParamAtCh.GetParameters().Print(); | |
019df241 | 740 | extrapTrackParamAtCh.GetCovariances().Print(); |
ea94c18b | 741 | } |
742 | ||
743 | // Printout for debuging | |
744 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
96ebe67e | 745 | cout << "FollowTrackInStation: look for clusters in chamber(1..): " << ch2+1 << endl; |
ea94c18b | 746 | } |
747 | ||
1fef78c8 | 748 | // Ask the clustering to reconstruct new clusters around the track position in the current station |
749 | // except for station 4 and 5 that are already entirely clusterized | |
a0dc65b4 | 750 | if (GetRecoParam()->CombineClusterTrackReco()) { |
1fef78c8 | 751 | if (nextStation < 3) AskForNewClustersInStation(extrapTrackParamAtCh, clusterStore, nextStation); |
752 | } | |
753 | ||
4ea3f013 | 754 | Int_t nClusters = clusterStore.GetSize(); |
755 | Bool_t *clusterCh1Used = new Bool_t[nClusters]; | |
756 | for (Int_t i = 0; i < nClusters; i++) clusterCh1Used[i] = kFALSE; | |
757 | Int_t iCluster1; | |
758 | ||
96ebe67e | 759 | // Create iterators to loop over clusters in both chambers |
760 | TIter nextInCh1(clusterStore.CreateChamberIterator(ch1,ch1)); | |
761 | TIter nextInCh2(clusterStore.CreateChamberIterator(ch2,ch2)); | |
762 | ||
763 | // look for candidates in chamber 2 | |
764 | while ( ( clusterCh2 = static_cast<AliMUONVCluster*>(nextInCh2()) ) ) { | |
ea94c18b | 765 | |
96ebe67e | 766 | // try to add the current cluster fast |
767 | if (!TryOneClusterFast(extrapTrackParamAtCh, clusterCh2)) continue; | |
019df241 | 768 | |
96ebe67e | 769 | // try to add the current cluster accuratly |
770 | chi2OfCluster = TryOneCluster(extrapTrackParamAtCh, clusterCh2, extrapTrackParamAtCluster2, | |
a0dc65b4 | 771 | GetRecoParam()->UseSmoother()); |
ea94c18b | 772 | |
96ebe67e | 773 | // if good chi2 then try to attach a cluster in the other chamber too |
774 | if (chi2OfCluster < maxChi2OfCluster) { | |
ea94c18b | 775 | |
a0dc65b4 | 776 | if (GetRecoParam()->UseSmoother()) { |
ea94c18b | 777 | // save extrapolated parameters for smoother |
96ebe67e | 778 | extrapTrackParamAtCluster2.SetExtrapParameters(extrapTrackParamAtCluster2.GetParameters()); |
ea94c18b | 779 | |
780 | // save extrapolated covariance matrix for smoother | |
96ebe67e | 781 | extrapTrackParamAtCluster2.SetExtrapCovariances(extrapTrackParamAtCluster2.GetCovariances()); |
ea94c18b | 782 | } |
783 | ||
96ebe67e | 784 | // Compute new track parameters including "clusterCh2" using kalman filter |
785 | addChi2TrackAtCluster2 = RunKalmanFilter(extrapTrackParamAtCluster2); | |
ea94c18b | 786 | |
6b191dea | 787 | // skip track out of limits |
788 | if (!IsAcceptable(extrapTrackParamAtCluster2)) continue; | |
89c8d66d | 789 | |
790 | // Printout for debuging | |
791 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
792 | cout << "FollowTrackInStation: found one cluster in chamber(1..): " << ch2+1 | |
793 | << " (Chi2 = " << chi2OfCluster << ")" << endl; | |
794 | clusterCh2->Print(); | |
795 | cout << " look for second clusters in chamber(1..): " << ch1+1 << " ..." << endl; | |
796 | } | |
797 | ||
ea94c18b | 798 | // copy new track parameters for next step |
96ebe67e | 799 | extrapTrackParam = extrapTrackParamAtCluster2; |
ea94c18b | 800 | |
801 | // add MCS effect | |
4663da9f | 802 | AliMUONTrackExtrap::AddMCSEffect(&extrapTrackParam,AliMUONConstants::ChamberThicknessInX0(ch2),-1.); |
ea94c18b | 803 | |
804 | // reset propagator for smoother | |
a0dc65b4 | 805 | if (GetRecoParam()->UseSmoother()) extrapTrackParam.ResetPropagator(); |
ea94c18b | 806 | |
019df241 | 807 | //Extrapolate track parameters to chamber "ch1" |
4ea3f013 | 808 | Bool_t normalExtrap = AliMUONTrackExtrap::ExtrapToZCov(&extrapTrackParam, AliMUONConstants::DefaultChamberZ(ch1), |
809 | GetRecoParam()->UseSmoother()); | |
019df241 | 810 | |
96ebe67e | 811 | // reset cluster iterator of chamber 1 |
812 | nextInCh1.Reset(); | |
813 | iCluster1 = -1; | |
814 | ||
815 | // look for second candidates in chamber 1 | |
89c8d66d | 816 | Bool_t foundSecondCluster = kFALSE; |
4ea3f013 | 817 | if (normalExtrap) while ( ( clusterCh1 = static_cast<AliMUONVCluster*>(nextInCh1()) ) ) { |
96ebe67e | 818 | iCluster1++; |
ea94c18b | 819 | |
96ebe67e | 820 | // try to add the current cluster fast |
821 | if (!TryOneClusterFast(extrapTrackParam, clusterCh1)) continue; | |
019df241 | 822 | |
96ebe67e | 823 | // try to add the current cluster accuratly |
824 | chi2OfCluster = TryOneCluster(extrapTrackParam, clusterCh1, extrapTrackParamAtCluster1, | |
a0dc65b4 | 825 | GetRecoParam()->UseSmoother()); |
019df241 | 826 | |
96ebe67e | 827 | // if good chi2 then consider to add the 2 clusters to the "trackCandidate" |
828 | if (chi2OfCluster < maxChi2OfCluster) { | |
019df241 | 829 | |
a0dc65b4 | 830 | if (GetRecoParam()->UseSmoother()) { |
ea94c18b | 831 | // save extrapolated parameters for smoother |
96ebe67e | 832 | extrapTrackParamAtCluster1.SetExtrapParameters(extrapTrackParamAtCluster1.GetParameters()); |
ea94c18b | 833 | |
834 | // save extrapolated covariance matrix for smoother | |
96ebe67e | 835 | extrapTrackParamAtCluster1.SetExtrapCovariances(extrapTrackParamAtCluster1.GetCovariances()); |
ea94c18b | 836 | } |
837 | ||
96ebe67e | 838 | // Compute new track parameters including "clusterCh1" using kalman filter |
839 | addChi2TrackAtCluster1 = RunKalmanFilter(extrapTrackParamAtCluster1); | |
ea94c18b | 840 | |
6b191dea | 841 | // skip track out of limits |
842 | if (!IsAcceptable(extrapTrackParamAtCluster1)) continue; | |
89c8d66d | 843 | |
844 | // remember a second cluster was found | |
845 | foundSecondCluster = kTRUE; | |
846 | foundTwoClusters = kTRUE; | |
847 | ||
848 | // Printout for debuging | |
849 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
850 | cout << "FollowTrackInStation: found one cluster in chamber(1..): " << ch1+1 | |
851 | << " (Chi2 = " << chi2OfCluster << ")" << endl; | |
852 | clusterCh1->Print(); | |
853 | } | |
9bf6860b | 854 | |
a0dc65b4 | 855 | if (GetRecoParam()->TrackAllTracks()) { |
96ebe67e | 856 | // copy trackCandidate into a new track put at the end of fRecTracksPtr and add the new clusters |
ea94c18b | 857 | newTrack = new ((*fRecTracksPtr)[fRecTracksPtr->GetLast()+1]) AliMUONTrack(trackCandidate); |
96ebe67e | 858 | UpdateTrack(*newTrack,extrapTrackParamAtCluster1,extrapTrackParamAtCluster2,addChi2TrackAtCluster1,addChi2TrackAtCluster2); |
ea94c18b | 859 | fNRecTracks++; |
860 | ||
96ebe67e | 861 | // Tag clusterCh1 as used |
862 | clusterCh1Used[iCluster1] = kTRUE; | |
ea94c18b | 863 | |
864 | // Printout for debuging | |
865 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
96ebe67e | 866 | cout << "FollowTrackInStation: added two clusters in station(1..): " << nextStation+1 << endl; |
ea94c18b | 867 | if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump(); |
868 | } | |
869 | ||
96ebe67e | 870 | } else if (addChi2TrackAtCluster1+addChi2TrackAtCluster2 < bestAddChi2TrackAtCluster1+bestAddChi2TrackAtCluster2) { |
871 | // keep track of the best couple of clusters | |
872 | bestAddChi2TrackAtCluster1 = addChi2TrackAtCluster1; | |
873 | bestAddChi2TrackAtCluster2 = addChi2TrackAtCluster2; | |
874 | bestTrackParamAtCluster1 = extrapTrackParamAtCluster1; | |
875 | bestTrackParamAtCluster2 = extrapTrackParamAtCluster2; | |
ea94c18b | 876 | } |
877 | ||
b0e4c598 | 878 | } |
ea94c18b | 879 | |
8cc77df0 | 880 | } |
ea94c18b | 881 | |
96ebe67e | 882 | // if no clusterCh1 found then consider to add clusterCh2 only |
883 | if (!foundSecondCluster) { | |
89c8d66d | 884 | |
885 | // remember a cluster was found | |
96ebe67e | 886 | foundOneCluster = kTRUE; |
ea94c18b | 887 | |
a0dc65b4 | 888 | if (GetRecoParam()->TrackAllTracks()) { |
96ebe67e | 889 | // copy trackCandidate into a new track put at the end of fRecTracksPtr and add the new cluster |
ea94c18b | 890 | newTrack = new ((*fRecTracksPtr)[fRecTracksPtr->GetLast()+1]) AliMUONTrack(trackCandidate); |
96ebe67e | 891 | UpdateTrack(*newTrack,extrapTrackParamAtCluster2,addChi2TrackAtCluster2); |
ea94c18b | 892 | fNRecTracks++; |
893 | ||
ea94c18b | 894 | // Printout for debuging |
895 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
96ebe67e | 896 | cout << "FollowTrackInStation: added one cluster in chamber(1..): " << ch2+1 << endl; |
ea94c18b | 897 | if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump(); |
898 | } | |
899 | ||
96ebe67e | 900 | } else if (!foundTwoClusters && addChi2TrackAtCluster2 < bestAddChi2TrackAtCluster1) { |
901 | // keep track of the best single cluster except if a couple of clusters has already been found | |
902 | bestAddChi2TrackAtCluster1 = addChi2TrackAtCluster2; | |
903 | bestTrackParamAtCluster1 = extrapTrackParamAtCluster2; | |
ea94c18b | 904 | } |
905 | ||
906 | } | |
907 | ||
8cc77df0 | 908 | } |
ea94c18b | 909 | |
910 | } | |
911 | ||
912 | // look for candidates in chamber 1 not already attached to a track | |
96ebe67e | 913 | // if we want to keep all possible tracks or if no good couple of clusters has been found |
a0dc65b4 | 914 | if (GetRecoParam()->TrackAllTracks() || !foundTwoClusters) { |
ea94c18b | 915 | |
ea94c18b | 916 | // add MCS effect for next step |
4663da9f | 917 | AliMUONTrackExtrap::AddMCSEffect(&extrapTrackParamAtCh,AliMUONConstants::ChamberThicknessInX0(ch2),-1.); |
019df241 | 918 | |
919 | //Extrapolate trackCandidate to chamber "ch1" | |
4ea3f013 | 920 | Bool_t normalExtrap = AliMUONTrackExtrap::ExtrapToZCov(&extrapTrackParamAtCh, AliMUONConstants::DefaultChamberZ(ch1), |
921 | GetRecoParam()->UseSmoother()); | |
019df241 | 922 | |
9bf6860b | 923 | // Printout for debuging |
924 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 2) || (AliLog::GetGlobalDebugLevel() >= 2)) { | |
925 | cout<<endl<<"Track parameters and covariances at first cluster extrapolated to z = "<<AliMUONConstants::DefaultChamberZ(ch1)<<":"<<endl; | |
926 | extrapTrackParamAtCh.GetParameters().Print(); | |
927 | extrapTrackParamAtCh.GetCovariances().Print(); | |
928 | } | |
929 | ||
930 | // Printout for debuging | |
931 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
932 | cout << "FollowTrackInStation: look for single clusters in chamber(1..): " << ch1+1 << endl; | |
933 | } | |
934 | ||
96ebe67e | 935 | // reset cluster iterator of chamber 1 |
936 | nextInCh1.Reset(); | |
937 | iCluster1 = -1; | |
938 | ||
939 | // look for second candidates in chamber 1 | |
4ea3f013 | 940 | if (normalExtrap) while ( ( clusterCh1 = static_cast<AliMUONVCluster*>(nextInCh1()) ) ) { |
96ebe67e | 941 | iCluster1++; |
ea94c18b | 942 | |
96ebe67e | 943 | if (clusterCh1Used[iCluster1]) continue; // Skip clusters already used |
ea94c18b | 944 | |
96ebe67e | 945 | // try to add the current cluster fast |
946 | if (!TryOneClusterFast(extrapTrackParamAtCh, clusterCh1)) continue; | |
019df241 | 947 | |
96ebe67e | 948 | // try to add the current cluster accuratly |
949 | chi2OfCluster = TryOneCluster(extrapTrackParamAtCh, clusterCh1, extrapTrackParamAtCluster1, | |
a0dc65b4 | 950 | GetRecoParam()->UseSmoother()); |
019df241 | 951 | |
96ebe67e | 952 | // if good chi2 then consider to add clusterCh1 |
953 | // We do not try to attach a cluster in the other chamber too since it has already been done above | |
954 | if (chi2OfCluster < maxChi2OfCluster) { | |
019df241 | 955 | |
a0dc65b4 | 956 | if (GetRecoParam()->UseSmoother()) { |
ea94c18b | 957 | // save extrapolated parameters for smoother |
96ebe67e | 958 | extrapTrackParamAtCluster1.SetExtrapParameters(extrapTrackParamAtCluster1.GetParameters()); |
ea94c18b | 959 | |
960 | // save extrapolated covariance matrix for smoother | |
96ebe67e | 961 | extrapTrackParamAtCluster1.SetExtrapCovariances(extrapTrackParamAtCluster1.GetCovariances()); |
ea94c18b | 962 | } |
963 | ||
96ebe67e | 964 | // Compute new track parameters including "clusterCh1" using kalman filter |
965 | addChi2TrackAtCluster1 = RunKalmanFilter(extrapTrackParamAtCluster1); | |
ea94c18b | 966 | |
6b191dea | 967 | // skip track out of limits |
968 | if (!IsAcceptable(extrapTrackParamAtCluster1)) continue; | |
89c8d66d | 969 | |
970 | // remember a cluster was found | |
971 | foundOneCluster = kTRUE; | |
972 | ||
973 | // Printout for debuging | |
974 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
975 | cout << "FollowTrackInStation: found one cluster in chamber(1..): " << ch1+1 | |
976 | << " (Chi2 = " << chi2OfCluster << ")" << endl; | |
977 | clusterCh1->Print(); | |
978 | } | |
9bf6860b | 979 | |
a0dc65b4 | 980 | if (GetRecoParam()->TrackAllTracks()) { |
96ebe67e | 981 | // copy trackCandidate into a new track put at the end of fRecTracksPtr and add the new cluster |
ea94c18b | 982 | newTrack = new ((*fRecTracksPtr)[fRecTracksPtr->GetLast()+1]) AliMUONTrack(trackCandidate); |
96ebe67e | 983 | UpdateTrack(*newTrack,extrapTrackParamAtCluster1,addChi2TrackAtCluster1); |
ea94c18b | 984 | fNRecTracks++; |
985 | ||
ea94c18b | 986 | // Printout for debuging |
987 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
96ebe67e | 988 | cout << "FollowTrackInStation: added one cluster in chamber(1..): " << ch1+1 << endl; |
ea94c18b | 989 | if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump(); |
990 | } | |
991 | ||
96ebe67e | 992 | } else if (addChi2TrackAtCluster1 < bestAddChi2TrackAtCluster1) { |
993 | // keep track of the best single cluster except if a couple of clusters has already been found | |
994 | bestAddChi2TrackAtCluster1 = addChi2TrackAtCluster1; | |
995 | bestTrackParamAtCluster1 = extrapTrackParamAtCluster1; | |
ea94c18b | 996 | } |
997 | ||
998 | } | |
999 | ||
8cc77df0 | 1000 | } |
ea94c18b | 1001 | |
1002 | } | |
1003 | ||
1004 | // fill out the best track if required else clean up the fRecTracksPtr array | |
a0dc65b4 | 1005 | if (!GetRecoParam()->TrackAllTracks()) { |
96ebe67e | 1006 | if (foundTwoClusters) { |
1007 | UpdateTrack(trackCandidate,bestTrackParamAtCluster1,bestTrackParamAtCluster2,bestAddChi2TrackAtCluster1,bestAddChi2TrackAtCluster2); | |
ea94c18b | 1008 | |
ea94c18b | 1009 | // Printout for debuging |
1010 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
96ebe67e | 1011 | cout << "FollowTrackInStation: added the two best clusters in station(1..): " << nextStation+1 << endl; |
ea94c18b | 1012 | if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump(); |
1013 | } | |
1014 | ||
96ebe67e | 1015 | } else if (foundOneCluster) { |
1016 | UpdateTrack(trackCandidate,bestTrackParamAtCluster1,bestAddChi2TrackAtCluster1); | |
ea94c18b | 1017 | |
ea94c18b | 1018 | // Printout for debuging |
1019 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
96ebe67e | 1020 | cout << "FollowTrackInStation: added the best cluster in chamber(1..): " << bestTrackParamAtCluster1.GetClusterPtr()->GetChamberId()+1 << endl; |
ea94c18b | 1021 | if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump(); |
1022 | } | |
1023 | ||
17773e2e | 1024 | } else { |
96ebe67e | 1025 | delete [] clusterCh1Used; |
17773e2e | 1026 | return kFALSE; |
1027 | } | |
9bf6860b | 1028 | |
96ebe67e | 1029 | } else if (foundOneCluster || foundTwoClusters) { |
ea94c18b | 1030 | |
1031 | // remove obsolete track | |
1032 | fRecTracksPtr->Remove(&trackCandidate); | |
1033 | fNRecTracks--; | |
1034 | ||
17773e2e | 1035 | } else { |
96ebe67e | 1036 | delete [] clusterCh1Used; |
17773e2e | 1037 | return kFALSE; |
9bf6860b | 1038 | } |
1039 | ||
96ebe67e | 1040 | delete [] clusterCh1Used; |
ea94c18b | 1041 | return kTRUE; |
1042 | ||
1043 | } | |
8cc77df0 | 1044 | |
ea94c18b | 1045 | //__________________________________________________________________________ |
96ebe67e | 1046 | Double_t AliMUONTrackReconstructorK::RunKalmanFilter(AliMUONTrackParam &trackParamAtCluster) |
ea94c18b | 1047 | { |
96ebe67e | 1048 | /// Compute new track parameters and their covariances including new cluster using kalman filter |
ea94c18b | 1049 | /// return the additional track chi2 |
1050 | AliDebug(1,"Enter RunKalmanFilter"); | |
1051 | ||
1052 | // Get actual track parameters (p) | |
96ebe67e | 1053 | TMatrixD param(trackParamAtCluster.GetParameters()); |
ea94c18b | 1054 | |
96ebe67e | 1055 | // Get new cluster parameters (m) |
1056 | AliMUONVCluster *cluster = trackParamAtCluster.GetClusterPtr(); | |
1057 | TMatrixD clusterParam(5,1); | |
1058 | clusterParam.Zero(); | |
1059 | clusterParam(0,0) = cluster->GetX(); | |
1060 | clusterParam(2,0) = cluster->GetY(); | |
ea94c18b | 1061 | |
1062 | // Compute the actual parameter weight (W) | |
96ebe67e | 1063 | TMatrixD paramWeight(trackParamAtCluster.GetCovariances()); |
ea94c18b | 1064 | if (paramWeight.Determinant() != 0) { |
1065 | paramWeight.Invert(); | |
1066 | } else { | |
1067 | AliWarning(" Determinant = 0"); | |
4ea3f013 | 1068 | return 2.*AliMUONTrack::MaxChi2(); |
8cc77df0 | 1069 | } |
ea94c18b | 1070 | |
96ebe67e | 1071 | // Compute the new cluster weight (U) |
1072 | TMatrixD clusterWeight(5,5); | |
1073 | clusterWeight.Zero(); | |
1074 | clusterWeight(0,0) = 1. / cluster->GetErrX2(); | |
1075 | clusterWeight(2,2) = 1. / cluster->GetErrY2(); | |
8cc77df0 | 1076 | |
ea94c18b | 1077 | // Compute the new parameters covariance matrix ( (W+U)^-1 ) |
96ebe67e | 1078 | TMatrixD newParamCov(paramWeight,TMatrixD::kPlus,clusterWeight); |
ea94c18b | 1079 | if (newParamCov.Determinant() != 0) { |
1080 | newParamCov.Invert(); | |
1081 | } else { | |
1082 | AliWarning(" Determinant = 0"); | |
4ea3f013 | 1083 | return 2.*AliMUONTrack::MaxChi2(); |
ea94c18b | 1084 | } |
1085 | ||
1086 | // Save the new parameters covariance matrix | |
96ebe67e | 1087 | trackParamAtCluster.SetCovariances(newParamCov); |
ea94c18b | 1088 | |
1089 | // Compute the new parameters (p' = ((W+U)^-1)U(m-p) + p) | |
96ebe67e | 1090 | TMatrixD tmp(clusterParam,TMatrixD::kMinus,param); |
1091 | TMatrixD tmp2(clusterWeight,TMatrixD::kMult,tmp); // U(m-p) | |
ea94c18b | 1092 | TMatrixD newParam(newParamCov,TMatrixD::kMult,tmp2); // ((W+U)^-1)U(m-p) |
1093 | newParam += param; // ((W+U)^-1)U(m-p) + p | |
1094 | ||
1095 | // Save the new parameters | |
96ebe67e | 1096 | trackParamAtCluster.SetParameters(newParam); |
ea94c18b | 1097 | |
1098 | // Compute the additional chi2 (= ((p'-p)^-1)W(p'-p) + ((p'-m)^-1)U(p'-m)) | |
1099 | tmp = newParam; // p' | |
1100 | tmp -= param; // (p'-p) | |
1101 | TMatrixD tmp3(paramWeight,TMatrixD::kMult,tmp); // W(p'-p) | |
1102 | TMatrixD addChi2Track(tmp,TMatrixD::kTransposeMult,tmp3); // ((p'-p)^-1)W(p'-p) | |
1103 | tmp = newParam; // p' | |
96ebe67e | 1104 | tmp -= clusterParam; // (p'-m) |
1105 | TMatrixD tmp4(clusterWeight,TMatrixD::kMult,tmp); // U(p'-m) | |
ea94c18b | 1106 | addChi2Track += TMatrixD(tmp,TMatrixD::kTransposeMult,tmp4); // ((p'-p)^-1)W(p'-p) + ((p'-m)^-1)U(p'-m) |
1107 | ||
1108 | return addChi2Track(0,0); | |
1109 | ||
8cc77df0 | 1110 | } |
1111 | ||
ea94c18b | 1112 | //__________________________________________________________________________ |
96ebe67e | 1113 | void AliMUONTrackReconstructorK::UpdateTrack(AliMUONTrack &track, AliMUONTrackParam &trackParamAtCluster, Double_t addChi2) |
8cc77df0 | 1114 | { |
96ebe67e | 1115 | /// Add 1 cluster to the track candidate |
ea94c18b | 1116 | /// Update chi2 of the track |
1117 | ||
9bf6860b | 1118 | // Flag cluster as being (not) removable |
a0dc65b4 | 1119 | if (GetRecoParam()->RequestStation(trackParamAtCluster.GetClusterPtr()->GetChamberId()/2)) |
9bf6860b | 1120 | trackParamAtCluster.SetRemovable(kFALSE); |
1121 | else trackParamAtCluster.SetRemovable(kTRUE); | |
96ebe67e | 1122 | trackParamAtCluster.SetLocalChi2(0.); // --> Local chi2 not used |
5f4ceff2 | 1123 | |
96ebe67e | 1124 | // Update the track chi2 into trackParamAtCluster |
1125 | trackParamAtCluster.SetTrackChi2(track.GetGlobalChi2() + addChi2); | |
ea94c18b | 1126 | |
1127 | // Update the chi2 of the new track | |
96ebe67e | 1128 | track.SetGlobalChi2(trackParamAtCluster.GetTrackChi2()); |
ea94c18b | 1129 | |
96ebe67e | 1130 | // Update array of TrackParamAtCluster |
1131 | track.AddTrackParamAtCluster(trackParamAtCluster,*(trackParamAtCluster.GetClusterPtr())); | |
ea94c18b | 1132 | |
1133 | } | |
8cc77df0 | 1134 | |
ea94c18b | 1135 | //__________________________________________________________________________ |
96ebe67e | 1136 | void AliMUONTrackReconstructorK::UpdateTrack(AliMUONTrack &track, AliMUONTrackParam &trackParamAtCluster1, AliMUONTrackParam &trackParamAtCluster2, |
1137 | Double_t addChi2AtCluster1, Double_t addChi2AtCluster2) | |
ea94c18b | 1138 | { |
96ebe67e | 1139 | /// Add 2 clusters to the track candidate (order is important) |
ea94c18b | 1140 | /// Update track and local chi2 |
1141 | ||
96ebe67e | 1142 | // Update local chi2 at first cluster |
1143 | AliMUONVCluster* cluster1 = trackParamAtCluster1.GetClusterPtr(); | |
1144 | Double_t deltaX = trackParamAtCluster1.GetNonBendingCoor() - cluster1->GetX(); | |
1145 | Double_t deltaY = trackParamAtCluster1.GetBendingCoor() - cluster1->GetY(); | |
1146 | Double_t localChi2AtCluster1 = deltaX*deltaX / cluster1->GetErrX2() + | |
1147 | deltaY*deltaY / cluster1->GetErrY2(); | |
1148 | trackParamAtCluster1.SetLocalChi2(localChi2AtCluster1); | |
ea94c18b | 1149 | |
96ebe67e | 1150 | // Flag first cluster as being removable |
1151 | trackParamAtCluster1.SetRemovable(kTRUE); | |
ea94c18b | 1152 | |
96ebe67e | 1153 | // Update local chi2 at second cluster |
1154 | AliMUONVCluster* cluster2 = trackParamAtCluster2.GetClusterPtr(); | |
1155 | AliMUONTrackParam extrapTrackParamAtCluster2(trackParamAtCluster1); | |
1156 | AliMUONTrackExtrap::ExtrapToZ(&extrapTrackParamAtCluster2, trackParamAtCluster2.GetZ()); | |
1157 | deltaX = extrapTrackParamAtCluster2.GetNonBendingCoor() - cluster2->GetX(); | |
1158 | deltaY = extrapTrackParamAtCluster2.GetBendingCoor() - cluster2->GetY(); | |
1159 | Double_t localChi2AtCluster2 = deltaX*deltaX / cluster2->GetErrX2() + | |
1160 | deltaY*deltaY / cluster2->GetErrY2(); | |
1161 | trackParamAtCluster2.SetLocalChi2(localChi2AtCluster2); | |
ea94c18b | 1162 | |
96ebe67e | 1163 | // Flag second cluster as being removable |
1164 | trackParamAtCluster2.SetRemovable(kTRUE); | |
ea94c18b | 1165 | |
96ebe67e | 1166 | // Update the track chi2 into trackParamAtCluster2 |
1167 | trackParamAtCluster2.SetTrackChi2(track.GetGlobalChi2() + addChi2AtCluster2); | |
ea94c18b | 1168 | |
96ebe67e | 1169 | // Update the track chi2 into trackParamAtCluster1 |
1170 | trackParamAtCluster1.SetTrackChi2(trackParamAtCluster2.GetTrackChi2() + addChi2AtCluster1); | |
ea94c18b | 1171 | |
1172 | // Update the chi2 of the new track | |
96ebe67e | 1173 | track.SetGlobalChi2(trackParamAtCluster1.GetTrackChi2()); |
ea94c18b | 1174 | |
96ebe67e | 1175 | // Update array of trackParamAtCluster |
1176 | track.AddTrackParamAtCluster(trackParamAtCluster1,*cluster1); | |
1177 | track.AddTrackParamAtCluster(trackParamAtCluster2,*cluster2); | |
ea94c18b | 1178 | |
1179 | } | |
8cc77df0 | 1180 | |
ea94c18b | 1181 | //__________________________________________________________________________ |
1fef78c8 | 1182 | Bool_t AliMUONTrackReconstructorK::RecoverTrack(AliMUONTrack &trackCandidate, AliMUONVClusterStore& clusterStore, Int_t nextStation) |
ea94c18b | 1183 | { |
1184 | /// Try to recover the track candidate in the next station | |
96ebe67e | 1185 | /// by removing the worst of the two clusters attached in the current station |
ea94c18b | 1186 | /// Return kTRUE if recovering succeeds |
1187 | AliDebug(1,"Enter RecoverTrack"); | |
1188 | ||
96ebe67e | 1189 | // Do not try to recover track until we have attached cluster(s) on station(1..) 3 |
ea94c18b | 1190 | if (nextStation > 1) return kFALSE; |
1191 | ||
96ebe67e | 1192 | Int_t worstClusterNumber = -1; |
9bf6860b | 1193 | Double_t localChi2, worstLocalChi2 = -1.; |
ea94c18b | 1194 | |
96ebe67e | 1195 | // Look for the cluster to remove |
1196 | for (Int_t clusterNumber = 0; clusterNumber < 2; clusterNumber++) { | |
1197 | AliMUONTrackParam *trackParamAtCluster = (AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->UncheckedAt(clusterNumber); | |
ea94c18b | 1198 | |
9bf6860b | 1199 | // check if current cluster is in the previous station |
1200 | if (trackParamAtCluster->GetClusterPtr()->GetChamberId()/2 != nextStation+1) break; | |
1201 | ||
96ebe67e | 1202 | // check if current cluster is removable |
1203 | if (!trackParamAtCluster->IsRemovable()) return kFALSE; | |
ea94c18b | 1204 | |
9bf6860b | 1205 | // reset the current cluster as being not removable if it is on a required station |
a0dc65b4 | 1206 | if (GetRecoParam()->RequestStation(nextStation+1)) trackParamAtCluster->SetRemovable(kFALSE); |
9bf6860b | 1207 | |
96ebe67e | 1208 | // Pick up cluster with the worst chi2 |
1209 | localChi2 = trackParamAtCluster->GetLocalChi2(); | |
1210 | if (localChi2 > worstLocalChi2) { | |
1211 | worstLocalChi2 = localChi2; | |
1212 | worstClusterNumber = clusterNumber; | |
8cc77df0 | 1213 | } |
ea94c18b | 1214 | } |
1215 | ||
9bf6860b | 1216 | // check if worst cluster found |
1217 | if (worstClusterNumber < 0) return kFALSE; | |
ea94c18b | 1218 | |
96ebe67e | 1219 | // Remove the worst cluster |
1220 | trackCandidate.RemoveTrackParamAtCluster((AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->UncheckedAt(worstClusterNumber)); | |
ea94c18b | 1221 | |
96ebe67e | 1222 | // Re-calculate track parameters at the (new) first cluster |
4ea3f013 | 1223 | if (!RetracePartialTrack(trackCandidate,(AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->UncheckedAt(1))) return kFALSE; |
ea94c18b | 1224 | |
6b191dea | 1225 | // skip track out of limits |
1226 | if (!IsAcceptable(*((AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->First()))) return kFALSE; | |
9bf6860b | 1227 | |
96ebe67e | 1228 | // Look for new cluster(s) in next station |
1229 | return FollowTrackInStation(trackCandidate, clusterStore, nextStation); | |
ea94c18b | 1230 | |
8cc77df0 | 1231 | } |
1232 | ||
1233 | //__________________________________________________________________________ | |
ea94c18b | 1234 | Bool_t AliMUONTrackReconstructorK::RunSmoother(AliMUONTrack &track) |
8cc77df0 | 1235 | { |
ea94c18b | 1236 | /// Compute new track parameters and their covariances using smoother |
3304fa09 | 1237 | AliDebug(1,"Enter UseSmoother"); |
ea94c18b | 1238 | |
96ebe67e | 1239 | AliMUONTrackParam *previousTrackParam = (AliMUONTrackParam*) track.GetTrackParamAtCluster()->First(); |
ea94c18b | 1240 | |
96ebe67e | 1241 | // Smoothed parameters and covariances at first cluster = filtered parameters and covariances |
ea94c18b | 1242 | previousTrackParam->SetSmoothParameters(previousTrackParam->GetParameters()); |
1243 | previousTrackParam->SetSmoothCovariances(previousTrackParam->GetCovariances()); | |
d1e6fdee | 1244 | |
1245 | AliMUONTrackParam *currentTrackParam = (AliMUONTrackParam*) track.GetTrackParamAtCluster()->After(previousTrackParam); | |
ea94c18b | 1246 | |
d1e6fdee | 1247 | // Save local chi2 at first cluster = last additional chi2 provided by Kalman |
1248 | previousTrackParam->SetLocalChi2(previousTrackParam->GetTrackChi2() - currentTrackParam->GetTrackChi2()); | |
ea94c18b | 1249 | |
ff078154 | 1250 | // if the track contains only 2 clusters simply copy the filtered parameters |
1251 | if (track.GetNClusters() == 2) { | |
1252 | currentTrackParam->SetSmoothParameters(currentTrackParam->GetParameters()); | |
1253 | currentTrackParam->SetSmoothCovariances(currentTrackParam->GetCovariances()); | |
1254 | currentTrackParam->SetLocalChi2(currentTrackParam->GetTrackChi2()); | |
1255 | return kTRUE; | |
1256 | } | |
1257 | ||
ea94c18b | 1258 | while (currentTrackParam) { |
1259 | ||
1260 | // Get variables | |
1261 | const TMatrixD &extrapParameters = previousTrackParam->GetExtrapParameters(); // X(k+1 k) | |
1262 | const TMatrixD &filteredParameters = currentTrackParam->GetParameters(); // X(k k) | |
1263 | const TMatrixD &previousSmoothParameters = previousTrackParam->GetSmoothParameters(); // X(k+1 n) | |
1264 | const TMatrixD &propagator = previousTrackParam->GetPropagator(); // F(k) | |
1265 | const TMatrixD &extrapCovariances = previousTrackParam->GetExtrapCovariances(); // C(k+1 k) | |
1266 | const TMatrixD &filteredCovariances = currentTrackParam->GetCovariances(); // C(k k) | |
1267 | const TMatrixD &previousSmoothCovariances = previousTrackParam->GetSmoothCovariances(); // C(k+1 n) | |
1268 | ||
d1e6fdee | 1269 | // Compute smoother gain: A(k) = C(kk) * F(k)^t * (C(k+1 k))^-1 |
ea94c18b | 1270 | TMatrixD extrapWeight(extrapCovariances); |
1271 | if (extrapWeight.Determinant() != 0) { | |
1272 | extrapWeight.Invert(); // (C(k+1 k))^-1 | |
1273 | } else { | |
1274 | AliWarning(" Determinant = 0"); | |
1275 | return kFALSE; | |
1276 | } | |
d1e6fdee | 1277 | TMatrixD smootherGain(filteredCovariances,TMatrixD::kMultTranspose,propagator); // C(kk) * F(k)^t |
1278 | smootherGain *= extrapWeight; // C(kk) * F(k)^t * (C(k+1 k))^-1 | |
ea94c18b | 1279 | |
1280 | // Compute smoothed parameters: X(k n) = X(k k) + A(k) * (X(k+1 n) - X(k+1 k)) | |
1281 | TMatrixD tmpParam(previousSmoothParameters,TMatrixD::kMinus,extrapParameters); // X(k+1 n) - X(k+1 k) | |
1282 | TMatrixD smoothParameters(smootherGain,TMatrixD::kMult,tmpParam); // A(k) * (X(k+1 n) - X(k+1 k)) | |
1283 | smoothParameters += filteredParameters; // X(k k) + A(k) * (X(k+1 n) - X(k+1 k)) | |
1284 | ||
1285 | // Save smoothed parameters | |
1286 | currentTrackParam->SetSmoothParameters(smoothParameters); | |
1287 | ||
1288 | // Compute smoothed covariances: C(k n) = C(k k) + A(k) * (C(k+1 n) - C(k+1 k)) * (A(k))^t | |
1289 | TMatrixD tmpCov(previousSmoothCovariances,TMatrixD::kMinus,extrapCovariances); // C(k+1 n) - C(k+1 k) | |
1290 | TMatrixD tmpCov2(tmpCov,TMatrixD::kMultTranspose,smootherGain); // (C(k+1 n) - C(k+1 k)) * (A(k))^t | |
1291 | TMatrixD smoothCovariances(smootherGain,TMatrixD::kMult,tmpCov2); // A(k) * (C(k+1 n) - C(k+1 k)) * (A(k))^t | |
1292 | smoothCovariances += filteredCovariances; // C(k k) + A(k) * (C(k+1 n) - C(k+1 k)) * (A(k))^t | |
1293 | ||
1294 | // Save smoothed covariances | |
1295 | currentTrackParam->SetSmoothCovariances(smoothCovariances); | |
1296 | ||
96ebe67e | 1297 | // Compute smoothed residual: r(k n) = cluster - X(k n) |
d1e6fdee | 1298 | AliMUONVCluster* cluster = currentTrackParam->GetClusterPtr(); |
ea94c18b | 1299 | TMatrixD smoothResidual(2,1); |
1300 | smoothResidual.Zero(); | |
96ebe67e | 1301 | smoothResidual(0,0) = cluster->GetX() - smoothParameters(0,0); |
1302 | smoothResidual(1,0) = cluster->GetY() - smoothParameters(2,0); | |
ea94c18b | 1303 | |
96ebe67e | 1304 | // Compute weight of smoothed residual: W(k n) = (clusterCov - C(k n))^-1 |
ea94c18b | 1305 | TMatrixD smoothResidualWeight(2,2); |
96ebe67e | 1306 | smoothResidualWeight(0,0) = cluster->GetErrX2() - smoothCovariances(0,0); |
ea94c18b | 1307 | smoothResidualWeight(0,1) = - smoothCovariances(0,2); |
1308 | smoothResidualWeight(1,0) = - smoothCovariances(2,0); | |
96ebe67e | 1309 | smoothResidualWeight(1,1) = cluster->GetErrY2() - smoothCovariances(2,2); |
ea94c18b | 1310 | if (smoothResidualWeight.Determinant() != 0) { |
1311 | smoothResidualWeight.Invert(); | |
1312 | } else { | |
1313 | AliWarning(" Determinant = 0"); | |
1314 | return kFALSE; | |
1315 | } | |
1316 | ||
1317 | // Compute local chi2 = (r(k n))^t * W(k n) * r(k n) | |
1318 | TMatrixD tmpChi2(smoothResidual,TMatrixD::kTransposeMult,smoothResidualWeight); // (r(k n))^t * W(k n) | |
1319 | TMatrixD localChi2(tmpChi2,TMatrixD::kMult,smoothResidual); // (r(k n))^t * W(k n) * r(k n) | |
1320 | ||
1321 | // Save local chi2 | |
1322 | currentTrackParam->SetLocalChi2(localChi2(0,0)); | |
1323 | ||
1324 | previousTrackParam = currentTrackParam; | |
96ebe67e | 1325 | currentTrackParam = (AliMUONTrackParam*) track.GetTrackParamAtCluster()->After(previousTrackParam); |
ea94c18b | 1326 | } |
1327 | ||
1328 | return kTRUE; | |
1329 | ||
8cc77df0 | 1330 | } |
1331 | ||
8cc77df0 | 1332 | //__________________________________________________________________________ |
89c8d66d | 1333 | Bool_t AliMUONTrackReconstructorK::ComplementTracks(const AliMUONVClusterStore& clusterStore) |
b709ac13 | 1334 | { |
1335 | /// Complete tracks by adding missing clusters (if there is an overlap between | |
89c8d66d | 1336 | /// two detection elements, the track may have two clusters in the same chamber). |
1337 | /// Recompute track parameters and covariances at each clusters. | |
4ea3f013 | 1338 | /// Remove tracks getting abnormal (i.e. extrapolation failed...) after being complemented. |
1339 | /// Return kTRUE if one or more tracks have been complemented or removed. | |
b709ac13 | 1340 | AliDebug(1,"Enter ComplementTracks"); |
1341 | ||
1342 | Int_t chamberId, detElemId; | |
96ebe67e | 1343 | Double_t chi2OfCluster, addChi2TrackAtCluster, bestAddChi2TrackAtCluster; |
a0dc65b4 | 1344 | Double_t maxChi2OfCluster = 2. * GetRecoParam()->GetSigmaCutForTracking() * |
1345 | GetRecoParam()->GetSigmaCutForTracking(); // 2 because 2 quantities in chi2 | |
89c8d66d | 1346 | Bool_t foundOneCluster, trackModified, hasChanged = kFALSE; |
96ebe67e | 1347 | AliMUONVCluster *cluster; |
1348 | AliMUONTrackParam *trackParam, *previousTrackParam, *nextTrackParam, trackParamAtCluster, bestTrackParamAtCluster; | |
4ea3f013 | 1349 | AliMUONTrack *nextTrack; |
b709ac13 | 1350 | |
b709ac13 | 1351 | AliMUONTrack *track = (AliMUONTrack*) fRecTracksPtr->First(); |
1352 | while (track) { | |
1353 | trackModified = kFALSE; | |
1354 | ||
96ebe67e | 1355 | trackParam = (AliMUONTrackParam*)track->GetTrackParamAtCluster()->First(); |
b709ac13 | 1356 | previousTrackParam = trackParam; |
1357 | while (trackParam) { | |
96ebe67e | 1358 | foundOneCluster = kFALSE; |
4ea3f013 | 1359 | bestAddChi2TrackAtCluster = AliMUONTrack::MaxChi2(); |
96ebe67e | 1360 | chamberId = trackParam->GetClusterPtr()->GetChamberId(); |
1361 | detElemId = trackParam->GetClusterPtr()->GetDetElemId(); | |
b709ac13 | 1362 | |
1363 | // prepare nextTrackParam before adding new cluster because of the sorting | |
96ebe67e | 1364 | nextTrackParam = (AliMUONTrackParam*)track->GetTrackParamAtCluster()->After(trackParam); |
b709ac13 | 1365 | |
96ebe67e | 1366 | // Create iterators to loop over clusters in current chamber |
1367 | TIter nextInCh(clusterStore.CreateChamberIterator(chamberId,chamberId)); | |
b709ac13 | 1368 | |
1369 | // look for one second candidate in the same chamber | |
96ebe67e | 1370 | while ( ( cluster = static_cast<AliMUONVCluster*>(nextInCh()) ) ) { |
b709ac13 | 1371 | |
1372 | // look for a cluster in another detection element | |
96ebe67e | 1373 | if (cluster->GetDetElemId() == detElemId) continue; |
b709ac13 | 1374 | |
96ebe67e | 1375 | // try to add the current cluster fast |
1376 | if (!TryOneClusterFast(*trackParam, cluster)) continue; | |
b709ac13 | 1377 | |
96ebe67e | 1378 | // try to add the current cluster accurately |
b709ac13 | 1379 | // never use track parameters at last cluster because the covariance matrix is meaningless |
96ebe67e | 1380 | if (nextTrackParam) chi2OfCluster = TryOneCluster(*trackParam, cluster, trackParamAtCluster); |
1381 | else chi2OfCluster = TryOneCluster(*previousTrackParam, cluster, trackParamAtCluster); | |
b709ac13 | 1382 | |
1383 | // if good chi2 then consider to add this cluster to the track | |
96ebe67e | 1384 | if (chi2OfCluster < maxChi2OfCluster) { |
b709ac13 | 1385 | |
96ebe67e | 1386 | // Compute local track parameters including current cluster using kalman filter |
1387 | addChi2TrackAtCluster = RunKalmanFilter(trackParamAtCluster); | |
b709ac13 | 1388 | |
1389 | // keep track of the best cluster | |
96ebe67e | 1390 | if (addChi2TrackAtCluster < bestAddChi2TrackAtCluster) { |
1391 | bestAddChi2TrackAtCluster = addChi2TrackAtCluster; | |
1392 | bestTrackParamAtCluster = trackParamAtCluster; | |
1393 | foundOneCluster = kTRUE; | |
b709ac13 | 1394 | } |
1395 | ||
1396 | } | |
1397 | ||
1398 | } | |
1399 | ||
1400 | // add new cluster if any | |
96ebe67e | 1401 | if (foundOneCluster) { |
0e894e58 | 1402 | |
1403 | // Printout for debuging | |
1404 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
1405 | cout << "ComplementTracks: found one cluster in chamber(1..): " << chamberId+1 << endl; | |
1406 | bestTrackParamAtCluster.GetClusterPtr()->Print(); | |
ad3c6eda | 1407 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 2) || (AliLog::GetGlobalDebugLevel() >= 2)) { |
1408 | cout<<endl<<"Track parameters and covariances at cluster:"<<endl; | |
1409 | bestTrackParamAtCluster.GetParameters().Print(); | |
1410 | bestTrackParamAtCluster.GetCovariances().Print(); | |
1411 | } | |
0e894e58 | 1412 | } |
1413 | ||
7332f213 | 1414 | trackParam->SetRemovable(kTRUE); |
1415 | bestTrackParamAtCluster.SetRemovable(kTRUE); | |
1416 | track->AddTrackParamAtCluster(bestTrackParamAtCluster,*(bestTrackParamAtCluster.GetClusterPtr())); | |
b709ac13 | 1417 | trackModified = kTRUE; |
89c8d66d | 1418 | hasChanged = kTRUE; |
b709ac13 | 1419 | } |
1420 | ||
1421 | previousTrackParam = trackParam; | |
1422 | trackParam = nextTrackParam; | |
1423 | } | |
1424 | ||
4ea3f013 | 1425 | // prepare next track |
1426 | nextTrack = (AliMUONTrack*) fRecTracksPtr->After(track); | |
1427 | ||
b709ac13 | 1428 | // re-compute track parameters using kalman filter if needed |
4ea3f013 | 1429 | if (trackModified && !RetraceTrack(*track,kTRUE)) { |
1430 | AliWarning("track modified but problem occur during refitting --> remove track"); | |
1431 | fRecTracksPtr->Remove(track); | |
1432 | fNRecTracks--; | |
1433 | } | |
b709ac13 | 1434 | |
4ea3f013 | 1435 | track = nextTrack; |
b709ac13 | 1436 | } |
1437 | ||
89c8d66d | 1438 | return hasChanged; |
1439 | ||
b709ac13 | 1440 | } |
1441 | ||
1442 | //__________________________________________________________________________ | |
7332f213 | 1443 | void AliMUONTrackReconstructorK::ImproveTrack(AliMUONTrack &track) |
8cc77df0 | 1444 | { |
7332f213 | 1445 | /// Improve the given track by removing removable clusters with local chi2 highter than the defined cut |
1446 | /// Removable clusters are identified by the method AliMUONTrack::TagRemovableClusters() | |
ea94c18b | 1447 | /// Recompute track parameters and covariances at the remaining clusters |
4ea3f013 | 1448 | /// and if something goes wrong (i.e. extrapolation failed...) set track chi2 to max value |
7332f213 | 1449 | AliDebug(1,"Enter ImproveTrack"); |
ea94c18b | 1450 | |
1451 | Double_t localChi2, worstLocalChi2; | |
ff078154 | 1452 | AliMUONTrackParam *trackParamAtCluster, *worstTrackParamAtCluster, *nextTrackParam, *next2nextTrackParam; |
1453 | Int_t nextChamber, next2nextChamber; | |
ea94c18b | 1454 | Bool_t smoothed; |
a0dc65b4 | 1455 | Double_t sigmaCut2 = GetRecoParam()->GetSigmaCutForImprovement() * |
1456 | GetRecoParam()->GetSigmaCutForImprovement(); | |
ea94c18b | 1457 | |
7332f213 | 1458 | while (!track.IsImproved()) { |
ea94c18b | 1459 | |
7332f213 | 1460 | // identify removable clusters |
a0dc65b4 | 1461 | track.TagRemovableClusters(GetRecoParam()->RequestedStationMask()); |
b709ac13 | 1462 | |
7332f213 | 1463 | // Run smoother if required |
1464 | smoothed = kFALSE; | |
a0dc65b4 | 1465 | if (GetRecoParam()->UseSmoother()) smoothed = RunSmoother(track); |
7332f213 | 1466 | |
1467 | // Use standard procedure to compute local chi2 if smoother not required or not working | |
1468 | if (!smoothed) { | |
ea94c18b | 1469 | |
7332f213 | 1470 | // Update track parameters and covariances |
4ea3f013 | 1471 | if (!track.UpdateCovTrackParamAtCluster()) { |
1472 | AliWarning("unable to update track parameters and covariances --> stop improvement"); | |
1473 | // restore the kalman parameters | |
1474 | RetraceTrack(track,kTRUE); | |
1475 | break; | |
1476 | } | |
ea94c18b | 1477 | |
7332f213 | 1478 | // Compute local chi2 of each clusters |
1479 | track.ComputeLocalChi2(kTRUE); | |
1480 | } | |
1481 | ||
1482 | // Look for the cluster to remove | |
1483 | worstTrackParamAtCluster = 0x0; | |
ff078154 | 1484 | worstLocalChi2 = -1.; |
7332f213 | 1485 | trackParamAtCluster = (AliMUONTrackParam*)track.GetTrackParamAtCluster()->First(); |
1486 | while (trackParamAtCluster) { | |
ea94c18b | 1487 | |
7332f213 | 1488 | // save parameters into smooth parameters in case of smoother did not work properly |
a0dc65b4 | 1489 | if (GetRecoParam()->UseSmoother() && !smoothed) { |
7332f213 | 1490 | trackParamAtCluster->SetSmoothParameters(trackParamAtCluster->GetParameters()); |
1491 | trackParamAtCluster->SetSmoothCovariances(trackParamAtCluster->GetCovariances()); | |
ea94c18b | 1492 | } |
1493 | ||
7332f213 | 1494 | // Pick up cluster with the worst chi2 |
1495 | localChi2 = trackParamAtCluster->GetLocalChi2(); | |
1496 | if (localChi2 > worstLocalChi2) { | |
1497 | worstLocalChi2 = localChi2; | |
1498 | worstTrackParamAtCluster = trackParamAtCluster; | |
ea94c18b | 1499 | } |
1500 | ||
7332f213 | 1501 | trackParamAtCluster = (AliMUONTrackParam*)track.GetTrackParamAtCluster()->After(trackParamAtCluster); |
1502 | } | |
1503 | ||
7332f213 | 1504 | // Check whether the worst chi2 is under requirement or not |
1505 | if (worstLocalChi2 < 2. * sigmaCut2) { // 2 because 2 quantities in chi2 | |
1506 | track.SetImproved(kTRUE); | |
1507 | break; | |
1508 | } | |
1509 | ||
1510 | // if the worst cluster is not removable then stop improvement | |
ff078154 | 1511 | if (!worstTrackParamAtCluster->IsRemovable()) { |
1512 | // restore the kalman parameters in case they have been lost | |
1513 | if (!smoothed) RetraceTrack(track,kTRUE); | |
1514 | break; | |
1515 | } | |
7332f213 | 1516 | |
1517 | // get track parameters at cluster next to the one to be removed | |
1518 | nextTrackParam = (AliMUONTrackParam*) track.GetTrackParamAtCluster()->After(worstTrackParamAtCluster); | |
1519 | ||
1520 | // Remove the worst cluster | |
1521 | track.RemoveTrackParamAtCluster(worstTrackParamAtCluster); | |
1522 | ||
1523 | // Re-calculate track parameters | |
1524 | // - from the cluster immediately downstream the one suppressed | |
1525 | // - or from the begining - if parameters have been re-computed using the standard method (kalman parameters have been lost) | |
ff078154 | 1526 | // - or if the removed cluster was used to compute the tracking seed |
4ea3f013 | 1527 | Bool_t normalExtrap; |
ff078154 | 1528 | if (smoothed && nextTrackParam) { |
1529 | ||
1530 | nextChamber = nextTrackParam->GetClusterPtr()->GetChamberId(); | |
1531 | next2nextTrackParam = nextTrackParam; | |
1532 | do { | |
1533 | ||
1534 | next2nextChamber = next2nextTrackParam->GetClusterPtr()->GetChamberId(); | |
1535 | next2nextTrackParam = (AliMUONTrackParam*) track.GetTrackParamAtCluster()->After(next2nextTrackParam); | |
1536 | ||
1537 | } while (next2nextTrackParam && (next2nextChamber == nextChamber)); | |
1538 | ||
4ea3f013 | 1539 | if (next2nextChamber == nextChamber) normalExtrap = RetraceTrack(track,kTRUE); |
1540 | else normalExtrap = RetracePartialTrack(track,nextTrackParam); | |
ff078154 | 1541 | |
4ea3f013 | 1542 | } else normalExtrap = RetraceTrack(track,kTRUE); |
1543 | ||
1544 | // stop in case of extrapolation problem | |
1545 | if (!normalExtrap) { | |
1546 | AliWarning("track partially improved but problem occur during refitting --> stop improvement"); | |
1547 | break; | |
1548 | } | |
7332f213 | 1549 | |
1550 | // Printout for debuging | |
1551 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
1552 | cout << "ImproveTracks: track " << fRecTracksPtr->IndexOf(&track)+1 << " improved " << endl; | |
ea94c18b | 1553 | } |
1554 | ||
ea94c18b | 1555 | } |
1556 | ||
8cc77df0 | 1557 | } |
1558 | ||
7332f213 | 1559 | //__________________________________________________________________________ |
4ea3f013 | 1560 | Bool_t AliMUONTrackReconstructorK::FinalizeTrack(AliMUONTrack &track) |
b0e4c598 | 1561 | { |
96ebe67e | 1562 | /// Update track parameters and covariances at each attached cluster |
7332f213 | 1563 | /// using smoother if required, if not already done |
4ea3f013 | 1564 | /// return kFALSE if the track cannot be extrapolated uo to the last chamber |
b709ac13 | 1565 | |
96ebe67e | 1566 | AliMUONTrackParam *trackParamAtCluster; |
ea94c18b | 1567 | Bool_t smoothed = kFALSE; |
1568 | ||
7332f213 | 1569 | // update track parameters (using smoother if required) if not already done |
4ea3f013 | 1570 | if (track.IsImproved()) smoothed = GetRecoParam()->UseSmoother(); |
1571 | else { | |
a0dc65b4 | 1572 | if (GetRecoParam()->UseSmoother()) smoothed = RunSmoother(track); |
d1e6fdee | 1573 | if (!smoothed) { |
4ea3f013 | 1574 | if (track.UpdateCovTrackParamAtCluster()) track.ComputeLocalChi2(kTRUE); |
1575 | else { | |
1576 | AliWarning("finalization failed due to extrapolation problem"); | |
1577 | return kFALSE; | |
1578 | } | |
d1e6fdee | 1579 | } |
4ea3f013 | 1580 | } |
7332f213 | 1581 | |
1582 | // copy smoothed parameters and covariances if any | |
1583 | if (smoothed) { | |
ea94c18b | 1584 | |
7332f213 | 1585 | trackParamAtCluster = (AliMUONTrackParam*) (track.GetTrackParamAtCluster()->First()); |
1586 | while (trackParamAtCluster) { | |
ea94c18b | 1587 | |
7332f213 | 1588 | trackParamAtCluster->SetParameters(trackParamAtCluster->GetSmoothParameters()); |
1589 | trackParamAtCluster->SetCovariances(trackParamAtCluster->GetSmoothCovariances()); | |
ea94c18b | 1590 | |
7332f213 | 1591 | trackParamAtCluster = (AliMUONTrackParam*) (track.GetTrackParamAtCluster()->After(trackParamAtCluster)); |
ea94c18b | 1592 | } |
1593 | ||
b0e4c598 | 1594 | } |
7332f213 | 1595 | |
4ea3f013 | 1596 | return kTRUE; |
1597 | ||
7deb8eb0 | 1598 | } |
1599 | ||
1600 | //__________________________________________________________________________ | |
b1fea02e | 1601 | Bool_t AliMUONTrackReconstructorK::RefitTrack(AliMUONTrack &track, Bool_t enableImprovement) |
7deb8eb0 | 1602 | { |
1603 | /// re-fit the given track | |
89c8d66d | 1604 | AliDebug(1,"Enter RefitTrack"); |
7deb8eb0 | 1605 | |
ff078154 | 1606 | // check validity of the track (i.e. at least 2 chambers hit on stations 4 and 5) |
1607 | if (!track.IsValid(0)) { | |
1608 | AliWarning("the track is not valid --> unable to refit"); | |
7deb8eb0 | 1609 | return kFALSE; |
1610 | } | |
1611 | ||
1612 | // re-compute track parameters and covariances using Kalman filter | |
4ea3f013 | 1613 | if (!RetraceTrack(track,kTRUE)) { |
1614 | AliWarning("bad track refitting due to extrapolation failure"); | |
1615 | return kFALSE; | |
1616 | } | |
7deb8eb0 | 1617 | |
1618 | // Improve the reconstructed tracks if required | |
b1fea02e | 1619 | track.SetImproved(kFALSE); |
a0dc65b4 | 1620 | if (enableImprovement && GetRecoParam()->ImproveTracks()) ImproveTrack(track); |
7deb8eb0 | 1621 | |
1622 | // Fill AliMUONTrack data members | |
4ea3f013 | 1623 | if (track.GetGlobalChi2() < AliMUONTrack::MaxChi2()) return FinalizeTrack(track); |
1624 | else { | |
1625 | AliWarning("track not finalized due to extrapolation failure"); | |
1626 | return kFALSE; | |
1627 | } | |
7deb8eb0 | 1628 | |
b0e4c598 | 1629 | } |
ea94c18b | 1630 |