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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 | |
cdd730d0 | 51 | using std::endl; |
52 | using std::cout; | |
8cde4af5 | 53 | /// \cond CLASSIMP |
8cc77df0 | 54 | ClassImp(AliMUONTrackReconstructorK) // Class implementation in ROOT context |
8cde4af5 | 55 | /// \endcond |
8cc77df0 | 56 | |
019df241 | 57 | //__________________________________________________________________________ |
a0dc65b4 | 58 | AliMUONTrackReconstructorK::AliMUONTrackReconstructorK(const AliMUONRecoParam* recoParam, AliMUONVClusterServer* clusterServer) |
59 | : AliMUONVTrackReconstructor(recoParam, clusterServer) | |
8cc77df0 | 60 | { |
96ebe67e | 61 | /// Constructor |
8cc77df0 | 62 | } |
63 | ||
019df241 | 64 | //__________________________________________________________________________ |
ea94c18b | 65 | AliMUONTrackReconstructorK::~AliMUONTrackReconstructorK() |
8cc77df0 | 66 | { |
ea94c18b | 67 | /// Destructor |
68 | } | |
8cc77df0 | 69 | |
70 | //__________________________________________________________________________ | |
89c8d66d | 71 | Bool_t AliMUONTrackReconstructorK::MakeTrackCandidates(AliMUONVClusterStore& clusterStore) |
8cc77df0 | 72 | { |
89c8d66d | 73 | /// To make track candidates (assuming linear propagation if AliMUONRecoParam::MakeTrackCandidatesFast() return kTRUE): |
ea94c18b | 74 | /// Start with segments station(1..) 4 or 5 then follow track in station 5 or 4. |
89c8d66d | 75 | /// Good candidates are made of at least three clusters if both stations are requested (two otherwise). |
76 | /// Keep only best candidates or all of them according to the flag AliMUONRecoParam::TrackAllTracks(). | |
b709ac13 | 77 | |
208f139e | 78 | TClonesArray *segments; |
89c8d66d | 79 | AliMUONObjectPair *segment; |
ea94c18b | 80 | AliMUONTrack *track; |
81 | Int_t iCandidate = 0; | |
96ebe67e | 82 | Bool_t clusterFound; |
8cc77df0 | 83 | |
ea94c18b | 84 | AliDebug(1,"Enter MakeTrackCandidates"); |
8cc77df0 | 85 | |
1fef78c8 | 86 | // Unless we're doing combined tracking, we'll clusterize all stations at once |
87 | Int_t firstChamber(0); | |
88 | Int_t lastChamber(9); | |
89 | ||
a0dc65b4 | 90 | if (GetRecoParam()->CombineClusterTrackReco()) { |
1fef78c8 | 91 | // ... Here's the exception : ask the clustering to reconstruct |
92 | // clusters *only* in station 4 and 5 for combined tracking | |
93 | firstChamber = 6; | |
94 | } | |
95 | ||
96 | for (Int_t i = firstChamber; i <= lastChamber; ++i ) | |
97 | { | |
35be7ed7 | 98 | if (fClusterServer && GetRecoParam()->UseChamber(i)) fClusterServer->Clusterize(i, clusterStore, AliMpArea(), GetRecoParam()); |
1fef78c8 | 99 | } |
100 | ||
ea94c18b | 101 | // Loop over stations(1..) 5 and 4 and make track candidates |
102 | for (Int_t istat=4; istat>=3; istat--) { | |
103 | ||
208f139e | 104 | // Make segments in the station |
9bf6860b | 105 | segments = MakeSegmentsBetweenChambers(clusterStore, 2*istat, 2*istat+1); |
ea94c18b | 106 | |
107 | // Loop over segments | |
89c8d66d | 108 | for (Int_t iSegment=0; iSegment<segments->GetEntriesFast(); iSegment++) { |
ea94c18b | 109 | AliDebug(1,Form("Making primary candidate(1..) %d",++iCandidate)); |
89c8d66d | 110 | segment = (AliMUONObjectPair*) segments->UncheckedAt(iSegment); |
ea94c18b | 111 | |
112 | // Transform segments to tracks and put them at the end of fRecTracksPtr | |
89c8d66d | 113 | track = new ((*fRecTracksPtr)[fRecTracksPtr->GetLast()+1]) AliMUONTrack(segment,GetRecoParam()->GetBendingVertexDispersion()); |
ea94c18b | 114 | fNRecTracks++; |
115 | ||
96ebe67e | 116 | // Look for compatible cluster(s) in the other station |
89c8d66d | 117 | if (GetRecoParam()->MakeTrackCandidatesFast()) clusterFound = FollowLinearTrackInStation(*track, clusterStore, 7-istat); |
118 | else clusterFound = FollowTrackInStation(*track, clusterStore, 7-istat); | |
019df241 | 119 | |
9bf6860b | 120 | // Remove track if no cluster found on a requested station |
89c8d66d | 121 | // or abort tracking if there are too many candidates |
6b191dea | 122 | if (GetRecoParam()->RequestStation(7-istat)) { |
123 | if (!clusterFound) { | |
124 | fRecTracksPtr->Remove(track); | |
125 | fNRecTracks--; | |
126 | } else if (fNRecTracks > GetRecoParam()->GetMaxTrackCandidates()) { | |
87976389 | 127 | AliError(Form("Too many track candidates (%d tracks). Stop tracking.", fNRecTracks)); |
6b191dea | 128 | return kFALSE; |
129 | } | |
130 | } else { | |
131 | if ((fNRecTracks + segments->GetEntriesFast() - iSegment - 1) > GetRecoParam()->GetMaxTrackCandidates()) { | |
4ea3f013 | 132 | AliError(Form("Too many track candidates (%d tracks). Stop tracking.", fNRecTracks + segments->GetEntriesFast() - iSegment - 1)); |
6b191dea | 133 | return kFALSE; |
134 | } | |
ea94c18b | 135 | } |
136 | ||
137 | } | |
89c8d66d | 138 | |
ea94c18b | 139 | } |
140 | ||
89c8d66d | 141 | // Keep all different tracks if required |
142 | if (GetRecoParam()->TrackAllTracks()) RemoveIdenticalTracks(); | |
ea94c18b | 143 | |
89c8d66d | 144 | // Retrace tracks using Kalman filter and select them if needed |
145 | Int_t nCurrentTracks = fRecTracksPtr->GetLast()+1; | |
146 | for (Int_t iRecTrack = 0; iRecTrack < nCurrentTracks; iRecTrack++) { | |
147 | track = (AliMUONTrack*) fRecTracksPtr->UncheckedAt(iRecTrack); | |
ea94c18b | 148 | |
89c8d66d | 149 | // skip empty slots |
150 | if(!track) continue; | |
151 | ||
4ea3f013 | 152 | // retrace tracks using Kalman filter and remove the ones for which extrap failed or that are out of limits |
153 | if (!RetraceTrack(*track,kTRUE) || !IsAcceptable(*((AliMUONTrackParam*)track->GetTrackParamAtCluster()->First()))) { | |
6b191dea | 154 | fRecTracksPtr->Remove(track); |
155 | fNRecTracks--; | |
ea94c18b | 156 | } |
157 | ||
158 | } | |
159 | ||
89c8d66d | 160 | // Keep only the best tracks if required |
161 | if (!GetRecoParam()->TrackAllTracks()) RemoveDoubleTracks(); | |
3e9a7a05 | 162 | else fRecTracksPtr->Compress(); |
ea94c18b | 163 | |
164 | AliDebug(1,Form("Number of good candidates = %d",fNRecTracks)); | |
165 | ||
89c8d66d | 166 | return kTRUE; |
167 | ||
9bf6860b | 168 | } |
169 | ||
170 | //__________________________________________________________________________ | |
89c8d66d | 171 | Bool_t AliMUONTrackReconstructorK::MakeMoreTrackCandidates(AliMUONVClusterStore& clusterStore) |
9bf6860b | 172 | { |
89c8d66d | 173 | /// To make extra track candidates assuming linear propagation: |
9bf6860b | 174 | /// clustering is supposed to be already done |
175 | /// Start with segments made of 1 cluster in each of the stations 4 and 5 then follow track in remaining chambers. | |
89c8d66d | 176 | /// Good candidates are made of at least three clusters if both stations are requested (two otherwise). |
9bf6860b | 177 | /// Keep only best candidates or all of them according to the flag fgkTrackAllTracks. |
178 | ||
179 | TClonesArray *segments; | |
89c8d66d | 180 | AliMUONObjectPair *segment; |
9bf6860b | 181 | AliMUONTrack *track; |
182 | Int_t iCandidate = 0, iCurrentTrack, nCurrentTracks; | |
183 | Int_t initialNRecTracks = fNRecTracks; | |
184 | Bool_t clusterFound; | |
185 | ||
186 | AliDebug(1,"Enter MakeMoreTrackCandidates"); | |
187 | ||
188 | // Double loop over chambers in stations(1..) 4 and 5 to make track candidates | |
189 | for (Int_t ich1 = 6; ich1 <= 7; ich1++) { | |
190 | for (Int_t ich2 = 8; ich2 <= 9; ich2++) { | |
191 | ||
192 | // Make segments between ch1 and ch2 | |
193 | segments = MakeSegmentsBetweenChambers(clusterStore, ich1, ich2); | |
194 | ||
89c8d66d | 195 | /// Remove segments already attached to a track |
196 | RemoveUsedSegments(*segments); | |
197 | ||
9bf6860b | 198 | // Loop over segments |
89c8d66d | 199 | for (Int_t iSegment=0; iSegment<segments->GetEntriesFast(); iSegment++) { |
9bf6860b | 200 | AliDebug(1,Form("Making primary candidate(1..) %d",++iCandidate)); |
89c8d66d | 201 | segment = (AliMUONObjectPair*) segments->UncheckedAt(iSegment); |
9bf6860b | 202 | |
203 | // Transform segments to tracks and put them at the end of fRecTracksPtr | |
204 | iCurrentTrack = fRecTracksPtr->GetLast()+1; | |
89c8d66d | 205 | track = new ((*fRecTracksPtr)[iCurrentTrack]) AliMUONTrack(segment,GetRecoParam()->GetBendingVertexDispersion()); |
9bf6860b | 206 | fNRecTracks++; |
207 | ||
208 | // Look for compatible cluster(s) in the second chamber of station 5 | |
89c8d66d | 209 | clusterFound = FollowLinearTrackInChamber(*track, clusterStore, 17-ich2); |
9bf6860b | 210 | |
211 | // skip the original track in case it has been removed | |
a0dc65b4 | 212 | if (GetRecoParam()->TrackAllTracks() && clusterFound) iCurrentTrack++; |
9bf6860b | 213 | |
214 | // loop over every new tracks | |
215 | nCurrentTracks = fRecTracksPtr->GetLast()+1; | |
216 | while (iCurrentTrack < nCurrentTracks) { | |
217 | track = (AliMUONTrack*) fRecTracksPtr->UncheckedAt(iCurrentTrack); | |
218 | ||
219 | // Look for compatible cluster(s) in the second chamber of station 4 | |
89c8d66d | 220 | FollowLinearTrackInChamber(*track, clusterStore, 13-ich1); |
9bf6860b | 221 | |
222 | iCurrentTrack++; | |
223 | } | |
224 | ||
89c8d66d | 225 | // abort tracking if there are too many candidates |
6b191dea | 226 | if ((fNRecTracks + segments->GetEntriesFast() - iSegment - 1) > GetRecoParam()->GetMaxTrackCandidates()) { |
87976389 | 227 | AliError(Form("Too many track candidates (%d tracks). Stop tracking.", fNRecTracks + segments->GetEntriesFast() - iSegment - 1)); |
89c8d66d | 228 | return kFALSE; |
229 | } | |
230 | ||
9bf6860b | 231 | } |
232 | ||
9bf6860b | 233 | } |
234 | } | |
235 | ||
89c8d66d | 236 | // Retrace tracks using Kalman filter (also compute track chi2) and select them |
237 | nCurrentTracks = fRecTracksPtr->GetLast()+1; | |
238 | for (Int_t iRecTrack = initialNRecTracks; iRecTrack < nCurrentTracks; iRecTrack++) { | |
9bf6860b | 239 | track = (AliMUONTrack*) fRecTracksPtr->UncheckedAt(iRecTrack); |
240 | ||
89c8d66d | 241 | // skip empty slots |
242 | if(!track) continue; | |
243 | ||
4ea3f013 | 244 | // retrace tracks using Kalman filter and remove the ones for which extrap failed or that are out of limits |
245 | if (!RetraceTrack(*track,kTRUE) || !IsAcceptable(*((AliMUONTrackParam*)track->GetTrackParamAtCluster()->First()))) { | |
6b191dea | 246 | fRecTracksPtr->Remove(track); |
247 | fNRecTracks--; | |
9bf6860b | 248 | } |
249 | ||
250 | } | |
251 | ||
89c8d66d | 252 | // Keep only the best tracks if required |
253 | if (!GetRecoParam()->TrackAllTracks()) RemoveDoubleTracks(); | |
254 | else fRecTracksPtr->Compress(); | |
9bf6860b | 255 | |
256 | AliDebug(1,Form("Number of good candidates = %d",fNRecTracks)); | |
257 | ||
89c8d66d | 258 | return kTRUE; |
259 | ||
8cc77df0 | 260 | } |
261 | ||
ea94c18b | 262 | //__________________________________________________________________________ |
4ea3f013 | 263 | Bool_t AliMUONTrackReconstructorK::RetraceTrack(AliMUONTrack &trackCandidate, Bool_t resetSeed) |
8cc77df0 | 264 | { |
96ebe67e | 265 | /// Re-run the kalman filter from the most downstream cluster to the most uptream one |
4ea3f013 | 266 | /// Return kFALSE in case of failure (i.e. extrapolation problem) |
ea94c18b | 267 | AliDebug(1,"Enter RetraceTrack"); |
268 | ||
7332f213 | 269 | AliMUONTrackParam* lastTrackParam = (AliMUONTrackParam*) trackCandidate.GetTrackParamAtCluster()->Last(); |
ea94c18b | 270 | |
96ebe67e | 271 | // Reset the "seed" (= track parameters and their covariances at last cluster) if required |
ea94c18b | 272 | if (resetSeed) { |
7332f213 | 273 | |
274 | // parameters at last cluster | |
275 | AliMUONVCluster* cluster2 = lastTrackParam->GetClusterPtr(); | |
276 | Double_t x2 = cluster2->GetX(); | |
277 | Double_t y2 = cluster2->GetY(); | |
278 | Double_t z2 = cluster2->GetZ(); | |
279 | ||
280 | // parameters at last but one cluster | |
281 | AliMUONTrackParam* previousTrackParam = (AliMUONTrackParam*) trackCandidate.GetTrackParamAtCluster()->Before(lastTrackParam); | |
282 | AliMUONVCluster* cluster1 = previousTrackParam->GetClusterPtr(); | |
0e894e58 | 283 | // make sure it is on the previous chamber (can have 2 clusters in the same chamber after "ComplementTrack") |
284 | if (cluster2->GetChamberId() == cluster1->GetChamberId()) { | |
285 | previousTrackParam = (AliMUONTrackParam*) trackCandidate.GetTrackParamAtCluster()->Before(previousTrackParam); | |
286 | cluster1 = previousTrackParam->GetClusterPtr(); | |
287 | } | |
7332f213 | 288 | Double_t x1 = cluster1->GetX(); |
289 | Double_t y1 = cluster1->GetY(); | |
290 | Double_t z1 = cluster1->GetZ(); | |
291 | ||
292 | // reset track parameters | |
293 | Double_t dZ = z1 - z2; | |
294 | lastTrackParam->SetNonBendingCoor(x2); | |
295 | lastTrackParam->SetBendingCoor(y2); | |
296 | lastTrackParam->SetZ(z2); | |
297 | lastTrackParam->SetNonBendingSlope((x1 - x2) / dZ); | |
298 | lastTrackParam->SetBendingSlope((y1 - y2) / dZ); | |
299 | Double_t bendingImpact = y2 - z2 * lastTrackParam->GetBendingSlope(); | |
9bf6860b | 300 | Double_t inverseBendingMomentum = 1. / AliMUONTrackExtrap::GetBendingMomentumFromImpactParam(bendingImpact); |
301 | lastTrackParam->SetInverseBendingMomentum(inverseBendingMomentum); | |
7332f213 | 302 | |
303 | // => Reset track parameter covariances at last cluster (as if the other clusters did not exist) | |
304 | TMatrixD lastParamCov(5,5); | |
305 | lastParamCov.Zero(); | |
ea94c18b | 306 | // Non bending plane |
7332f213 | 307 | lastParamCov(0,0) = cluster2->GetErrX2(); |
89c8d66d | 308 | lastParamCov(0,1) = - cluster2->GetErrX2() / dZ; |
309 | lastParamCov(1,0) = lastParamCov(0,1); | |
310 | lastParamCov(1,1) = ( 1000. * cluster1->GetErrX2() + cluster2->GetErrX2() ) / dZ / dZ; | |
ea94c18b | 311 | // Bending plane |
7332f213 | 312 | lastParamCov(2,2) = cluster2->GetErrY2(); |
89c8d66d | 313 | lastParamCov(2,3) = - cluster2->GetErrY2() / dZ; |
314 | lastParamCov(3,2) = lastParamCov(2,3); | |
315 | lastParamCov(3,3) = ( 1000. * cluster1->GetErrY2() + cluster2->GetErrY2() ) / dZ / dZ; | |
9bf6860b | 316 | // Inverse bending momentum (vertex resolution + bending slope resolution + 10% error on dipole parameters+field) |
89c8d66d | 317 | if (AliMUONTrackExtrap::IsFieldON()) { |
318 | lastParamCov(4,4) = ((GetRecoParam()->GetBendingVertexDispersion() * | |
319 | GetRecoParam()->GetBendingVertexDispersion() + | |
320 | (z1 * z1 * cluster2->GetErrY2() + z2 * z2 * 1000. * cluster1->GetErrY2()) / dZ / dZ) / | |
321 | bendingImpact / bendingImpact + 0.1 * 0.1) * inverseBendingMomentum * inverseBendingMomentum; | |
322 | lastParamCov(2,4) = z1 * cluster2->GetErrY2() * inverseBendingMomentum / bendingImpact / dZ; | |
323 | lastParamCov(4,2) = lastParamCov(2,4); | |
324 | lastParamCov(3,4) = - (z1 * cluster2->GetErrY2() + z2 * 1000. * cluster1->GetErrY2()) * | |
325 | inverseBendingMomentum / bendingImpact / dZ / dZ; | |
326 | lastParamCov(4,3) = lastParamCov(3,4); | |
327 | } else lastParamCov(4,4) = inverseBendingMomentum*inverseBendingMomentum; | |
7332f213 | 328 | lastTrackParam->SetCovariances(lastParamCov); |
ea94c18b | 329 | |
330 | // Reset the track chi2 | |
7332f213 | 331 | lastTrackParam->SetTrackChi2(0.); |
ea94c18b | 332 | |
333 | } | |
334 | ||
335 | // Redo the tracking | |
4ea3f013 | 336 | return RetracePartialTrack(trackCandidate, lastTrackParam); |
ea94c18b | 337 | |
338 | } | |
8cc77df0 | 339 | |
ea94c18b | 340 | //__________________________________________________________________________ |
4ea3f013 | 341 | Bool_t AliMUONTrackReconstructorK::RetracePartialTrack(AliMUONTrack &trackCandidate, const AliMUONTrackParam* startingTrackParam) |
ea94c18b | 342 | { |
96ebe67e | 343 | /// Re-run the kalman filter from the cluster attached to startingTrackParam to the most uptream cluster |
4ea3f013 | 344 | /// Return kFALSE in case of failure (i.e. extrapolation problem) |
ea94c18b | 345 | AliDebug(1,"Enter RetracePartialTrack"); |
346 | ||
347 | // Printout for debuging | |
348 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
96ebe67e | 349 | cout << "RetracePartialTrack: track chi2 before re-tracking: " << trackCandidate.GetGlobalChi2() << endl; |
ea94c18b | 350 | } |
351 | ||
352 | // Reset the track chi2 | |
96ebe67e | 353 | trackCandidate.SetGlobalChi2(startingTrackParam->GetTrackChi2()); |
ea94c18b | 354 | |
96ebe67e | 355 | // loop over attached clusters until the first one and recompute track parameters and covariances using kalman filter |
4ea3f013 | 356 | Bool_t extrapStatus = kTRUE; |
96ebe67e | 357 | Int_t expectedChamber = startingTrackParam->GetClusterPtr()->GetChamberId() - 1; |
ea94c18b | 358 | Int_t currentChamber; |
96ebe67e | 359 | Double_t addChi2TrackAtCluster; |
360 | AliMUONTrackParam* trackParamAtCluster = (AliMUONTrackParam*) trackCandidate.GetTrackParamAtCluster()->Before(startingTrackParam); | |
361 | while (trackParamAtCluster) { | |
ea94c18b | 362 | |
363 | // reset track parameters and their covariances | |
96ebe67e | 364 | trackParamAtCluster->SetParameters(startingTrackParam->GetParameters()); |
365 | trackParamAtCluster->SetZ(startingTrackParam->GetZ()); | |
366 | trackParamAtCluster->SetCovariances(startingTrackParam->GetCovariances()); | |
ea94c18b | 367 | |
368 | // add MCS effect | |
4663da9f | 369 | AliMUONTrackExtrap::AddMCSEffect(trackParamAtCluster,AliMUONConstants::ChamberThicknessInX0(expectedChamber+1),-1.); |
ea94c18b | 370 | |
371 | // reset propagator for smoother | |
a0dc65b4 | 372 | if (GetRecoParam()->UseSmoother()) trackParamAtCluster->ResetPropagator(); |
ea94c18b | 373 | |
9bf6860b | 374 | // add MCS in missing chambers if any |
96ebe67e | 375 | currentChamber = trackParamAtCluster->GetClusterPtr()->GetChamberId(); |
ea94c18b | 376 | while (currentChamber < expectedChamber) { |
377 | // extrapolation to the missing chamber (update the propagator) | |
4ea3f013 | 378 | if (!AliMUONTrackExtrap::ExtrapToZCov(trackParamAtCluster, AliMUONConstants::DefaultChamberZ(expectedChamber), |
379 | GetRecoParam()->UseSmoother())) extrapStatus = kFALSE; | |
ea94c18b | 380 | // add MCS effect |
4663da9f | 381 | AliMUONTrackExtrap::AddMCSEffect(trackParamAtCluster,AliMUONConstants::ChamberThicknessInX0(expectedChamber),-1.); |
ea94c18b | 382 | expectedChamber--; |
383 | } | |
384 | ||
96ebe67e | 385 | // extrapolation to the plane of the cluster attached to the current trackParamAtCluster (update the propagator) |
4ea3f013 | 386 | if (!AliMUONTrackExtrap::ExtrapToZCov(trackParamAtCluster, trackParamAtCluster->GetClusterPtr()->GetZ(), |
387 | GetRecoParam()->UseSmoother())) extrapStatus = kFALSE; | |
ea94c18b | 388 | |
a0dc65b4 | 389 | if (GetRecoParam()->UseSmoother()) { |
ea94c18b | 390 | // save extrapolated parameters for smoother |
96ebe67e | 391 | trackParamAtCluster->SetExtrapParameters(trackParamAtCluster->GetParameters()); |
ea94c18b | 392 | |
393 | // save extrapolated covariance matrix for smoother | |
96ebe67e | 394 | trackParamAtCluster->SetExtrapCovariances(trackParamAtCluster->GetCovariances()); |
ea94c18b | 395 | } |
396 | ||
9bf6860b | 397 | // Compute new track parameters using kalman filter |
96ebe67e | 398 | addChi2TrackAtCluster = RunKalmanFilter(*trackParamAtCluster); |
ea94c18b | 399 | |
400 | // Update the track chi2 | |
96ebe67e | 401 | trackCandidate.SetGlobalChi2(trackCandidate.GetGlobalChi2() + addChi2TrackAtCluster); |
402 | trackParamAtCluster->SetTrackChi2(trackCandidate.GetGlobalChi2()); | |
ea94c18b | 403 | |
96ebe67e | 404 | // prepare next step |
405 | expectedChamber = currentChamber - 1; | |
406 | startingTrackParam = trackParamAtCluster; | |
407 | trackParamAtCluster = (AliMUONTrackParam*) (trackCandidate.GetTrackParamAtCluster()->Before(startingTrackParam)); | |
ea94c18b | 408 | } |
409 | ||
410 | // Printout for debuging | |
411 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
96ebe67e | 412 | cout << "RetracePartialTrack: track chi2 after re-tracking: " << trackCandidate.GetGlobalChi2() << endl; |
ea94c18b | 413 | } |
414 | ||
4ea3f013 | 415 | // set global chi2 to max value in case of problem during track extrapolation |
416 | if (!extrapStatus) trackCandidate.SetGlobalChi2(2.*AliMUONTrack::MaxChi2()); | |
417 | return extrapStatus; | |
418 | ||
ea94c18b | 419 | } |
8cc77df0 | 420 | |
ea94c18b | 421 | //__________________________________________________________________________ |
89c8d66d | 422 | Bool_t AliMUONTrackReconstructorK::FollowTracks(AliMUONVClusterStore& clusterStore) |
ea94c18b | 423 | { |
424 | /// Follow tracks in stations(1..) 3, 2 and 1 | |
425 | AliDebug(1,"Enter FollowTracks"); | |
426 | ||
427 | AliMUONTrack *track; | |
428 | Int_t currentNRecTracks; | |
ea94c18b | 429 | |
430 | for (Int_t station = 2; station >= 0; station--) { | |
431 | ||
432 | // Save the actual number of reconstructed track in case of | |
433 | // tracks are added or suppressed during the tracking procedure | |
434 | // !! Do not compress fRecTracksPtr until the end of the loop over tracks !! | |
435 | currentNRecTracks = fNRecTracks; | |
436 | ||
437 | for (Int_t iRecTrack = 0; iRecTrack <currentNRecTracks; iRecTrack++) { | |
438 | AliDebug(1,Form("FollowTracks: track candidate(1..) %d", iRecTrack+1)); | |
439 | ||
440 | track = (AliMUONTrack*) fRecTracksPtr->UncheckedAt(iRecTrack); | |
441 | ||
96ebe67e | 442 | // Look for compatible cluster(s) in station(0..) "station" |
9bf6860b | 443 | if (!FollowTrackInStation(*track, clusterStore, station)) { |
444 | ||
445 | // Try to recover track if required | |
a0dc65b4 | 446 | if (GetRecoParam()->RecoverTracks()) { |
9bf6860b | 447 | |
448 | // work on a copy of the track if this station is not required | |
449 | // to keep the case where no cluster is reconstructed as a possible candidate | |
a0dc65b4 | 450 | if (!GetRecoParam()->RequestStation(station)) { |
9bf6860b | 451 | track = new ((*fRecTracksPtr)[fRecTracksPtr->GetLast()+1]) AliMUONTrack(*track); |
452 | fNRecTracks++; | |
453 | } | |
454 | ||
455 | // try to recover | |
456 | if (!RecoverTrack(*track, clusterStore, station)) { | |
457 | // remove track if no cluster found | |
458 | fRecTracksPtr->Remove(track); | |
459 | fNRecTracks--; | |
460 | } | |
461 | ||
a0dc65b4 | 462 | } else if (GetRecoParam()->RequestStation(station)) { |
9bf6860b | 463 | // remove track if no cluster found |
464 | fRecTracksPtr->Remove(track); | |
465 | fNRecTracks--; | |
466 | } | |
467 | ||
8cc77df0 | 468 | } |
ea94c18b | 469 | |
89c8d66d | 470 | // abort tracking if there are too many candidates |
6b191dea | 471 | if (GetRecoParam()->RequestStation(station)) { |
472 | if (fNRecTracks > GetRecoParam()->GetMaxTrackCandidates()) { | |
87976389 | 473 | AliError(Form("Too many track candidates (%d tracks). Stop tracking.", fNRecTracks)); |
6b191dea | 474 | return kFALSE; |
475 | } | |
476 | } else { | |
477 | if ((fNRecTracks + currentNRecTracks - iRecTrack - 1) > GetRecoParam()->GetMaxTrackCandidates()) { | |
87976389 | 478 | AliError(Form("Too many track candidates (%d tracks). Stop tracking.", fNRecTracks + currentNRecTracks - iRecTrack - 1)); |
6b191dea | 479 | return kFALSE; |
480 | } | |
89c8d66d | 481 | } |
482 | ||
8cc77df0 | 483 | } |
ea94c18b | 484 | |
485 | fRecTracksPtr->Compress(); // this is essential before checking tracks | |
486 | ||
ea94c18b | 487 | // Keep only the best tracks if required |
a0dc65b4 | 488 | if (!GetRecoParam()->TrackAllTracks()) RemoveDoubleTracks(); |
ea94c18b | 489 | |
490 | } | |
491 | ||
89c8d66d | 492 | return kTRUE; |
493 | ||
9bf6860b | 494 | } |
495 | ||
496 | //__________________________________________________________________________ | |
497 | Bool_t AliMUONTrackReconstructorK::FollowTrackInChamber(AliMUONTrack &trackCandidate, AliMUONVClusterStore& clusterStore, Int_t nextChamber) | |
498 | { | |
499 | /// Follow trackCandidate in chamber(0..) nextChamber and search for compatible cluster(s) | |
500 | /// Keep all possibilities or only the best one(s) according to the flag fgkTrackAllTracks: | |
501 | /// kTRUE: duplicate "trackCandidate" if there are several possibilities and add the new tracks at the end of | |
502 | /// fRecTracksPtr to avoid conficts with other track candidates at this current stage of the tracking procedure. | |
503 | /// Remove the obsolete "trackCandidate" at the end. | |
504 | /// kFALSE: add only the best cluster(s) to the "trackCandidate". Try to add a couple of clusters in priority. | |
505 | /// return kTRUE if new cluster(s) have been found (otherwise return kFALSE) | |
506 | AliDebug(1,Form("Enter FollowTrackInChamber(1..) %d", nextChamber+1)); | |
507 | ||
9bf6860b | 508 | Double_t chi2OfCluster; |
a0dc65b4 | 509 | Double_t maxChi2OfCluster = 2. * GetRecoParam()->GetSigmaCutForTracking() * |
510 | GetRecoParam()->GetSigmaCutForTracking(); // 2 because 2 quantities in chi2 | |
9bf6860b | 511 | Double_t addChi2TrackAtCluster; |
4ea3f013 | 512 | Double_t bestAddChi2TrackAtCluster = AliMUONTrack::MaxChi2(); |
9bf6860b | 513 | Bool_t foundOneCluster = kFALSE; |
514 | AliMUONTrack *newTrack = 0x0; | |
515 | AliMUONVCluster *cluster; | |
516 | AliMUONTrackParam extrapTrackParamAtCh; | |
517 | AliMUONTrackParam extrapTrackParamAtCluster; | |
518 | AliMUONTrackParam bestTrackParamAtCluster; | |
519 | ||
520 | // Get track parameters according to the propagation direction | |
521 | if (nextChamber > 7) extrapTrackParamAtCh = *(AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->Last(); | |
522 | else extrapTrackParamAtCh = *(AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->First(); | |
523 | ||
524 | // Printout for debuging | |
525 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 2) || (AliLog::GetGlobalDebugLevel() >= 2)) { | |
526 | cout<<endl<<"Track parameters and covariances at first cluster:"<<endl; | |
527 | extrapTrackParamAtCh.GetParameters().Print(); | |
528 | extrapTrackParamAtCh.GetCovariances().Print(); | |
529 | } | |
530 | ||
531 | // Add MCS effect | |
4663da9f | 532 | Int_t currentChamber = extrapTrackParamAtCh.GetClusterPtr()->GetChamberId(); |
533 | AliMUONTrackExtrap::AddMCSEffect(&extrapTrackParamAtCh,AliMUONConstants::ChamberThicknessInX0(currentChamber),-1.); | |
9bf6860b | 534 | |
535 | // reset propagator for smoother | |
a0dc65b4 | 536 | if (GetRecoParam()->UseSmoother()) extrapTrackParamAtCh.ResetPropagator(); |
9bf6860b | 537 | |
538 | // Add MCS in the missing chamber(s) if any | |
9bf6860b | 539 | while (currentChamber > nextChamber + 1) { |
540 | // extrapolation to the missing chamber | |
541 | currentChamber--; | |
4ea3f013 | 542 | if (!AliMUONTrackExtrap::ExtrapToZCov(&extrapTrackParamAtCh, AliMUONConstants::DefaultChamberZ(currentChamber), |
543 | GetRecoParam()->UseSmoother())) return kFALSE; | |
9bf6860b | 544 | // add MCS effect |
4663da9f | 545 | AliMUONTrackExtrap::AddMCSEffect(&extrapTrackParamAtCh,AliMUONConstants::ChamberThicknessInX0(currentChamber),-1.); |
9bf6860b | 546 | } |
547 | ||
548 | //Extrapolate trackCandidate to chamber | |
4ea3f013 | 549 | if (!AliMUONTrackExtrap::ExtrapToZCov(&extrapTrackParamAtCh, AliMUONConstants::DefaultChamberZ(nextChamber), |
550 | GetRecoParam()->UseSmoother())) return kFALSE; | |
9bf6860b | 551 | |
552 | // Printout for debuging | |
553 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 2) || (AliLog::GetGlobalDebugLevel() >= 2)) { | |
554 | cout<<endl<<"Track parameters and covariances at first cluster extrapolated to z = "<<AliMUONConstants::DefaultChamberZ(nextChamber)<<":"<<endl; | |
555 | extrapTrackParamAtCh.GetParameters().Print(); | |
556 | extrapTrackParamAtCh.GetCovariances().Print(); | |
557 | } | |
558 | ||
559 | // Printout for debuging | |
560 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
561 | cout << "FollowTrackInChamber: look for clusters in chamber(1..): " << nextChamber+1 << endl; | |
562 | } | |
563 | ||
564 | // Ask the clustering to reconstruct new clusters around the track position in the current chamber | |
565 | // except for station 4 and 5 that are already entirely clusterized | |
a0dc65b4 | 566 | if (GetRecoParam()->CombineClusterTrackReco()) { |
9bf6860b | 567 | if (nextChamber < 6) AskForNewClustersInChamber(extrapTrackParamAtCh, clusterStore, nextChamber); |
568 | } | |
569 | ||
570 | // Create iterators to loop over clusters in both chambers | |
571 | TIter next(clusterStore.CreateChamberIterator(nextChamber,nextChamber)); | |
572 | ||
573 | // look for candidates in chamber | |
574 | while ( ( cluster = static_cast<AliMUONVCluster*>(next()) ) ) { | |
575 | ||
576 | // try to add the current cluster fast | |
577 | if (!TryOneClusterFast(extrapTrackParamAtCh, cluster)) continue; | |
578 | ||
579 | // try to add the current cluster accuratly | |
580 | chi2OfCluster = TryOneCluster(extrapTrackParamAtCh, cluster, extrapTrackParamAtCluster, | |
a0dc65b4 | 581 | GetRecoParam()->UseSmoother()); |
9bf6860b | 582 | |
583 | // if good chi2 then consider to add cluster | |
584 | if (chi2OfCluster < maxChi2OfCluster) { | |
9bf6860b | 585 | |
a0dc65b4 | 586 | if (GetRecoParam()->UseSmoother()) { |
9bf6860b | 587 | // save extrapolated parameters for smoother |
588 | extrapTrackParamAtCluster.SetExtrapParameters(extrapTrackParamAtCluster.GetParameters()); | |
589 | ||
590 | // save extrapolated covariance matrix for smoother | |
591 | extrapTrackParamAtCluster.SetExtrapCovariances(extrapTrackParamAtCluster.GetCovariances()); | |
592 | } | |
593 | ||
594 | // Compute new track parameters including new cluster using kalman filter | |
595 | addChi2TrackAtCluster = RunKalmanFilter(extrapTrackParamAtCluster); | |
596 | ||
6b191dea | 597 | // skip track out of limits |
598 | if (!IsAcceptable(extrapTrackParamAtCluster)) continue; | |
89c8d66d | 599 | |
600 | // remember a cluster was found | |
601 | foundOneCluster = kTRUE; | |
602 | ||
603 | // Printout for debuging | |
604 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
605 | cout << "FollowTrackInChamber: found one cluster in chamber(1..): " << nextChamber+1 | |
606 | << " (Chi2 = " << chi2OfCluster << ")" << endl; | |
607 | cluster->Print(); | |
608 | } | |
9bf6860b | 609 | |
a0dc65b4 | 610 | if (GetRecoParam()->TrackAllTracks()) { |
9bf6860b | 611 | // copy trackCandidate into a new track put at the end of fRecTracksPtr and add the new cluster |
612 | newTrack = new ((*fRecTracksPtr)[fRecTracksPtr->GetLast()+1]) AliMUONTrack(trackCandidate); | |
613 | UpdateTrack(*newTrack,extrapTrackParamAtCluster,addChi2TrackAtCluster); | |
614 | fNRecTracks++; | |
615 | ||
616 | // Printout for debuging | |
617 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
618 | cout << "FollowTrackInChamber: added one cluster in chamber(1..): " << nextChamber+1 << endl; | |
619 | if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump(); | |
620 | } | |
621 | ||
622 | } else if (addChi2TrackAtCluster < bestAddChi2TrackAtCluster) { | |
623 | // keep track of the best cluster | |
624 | bestAddChi2TrackAtCluster = addChi2TrackAtCluster; | |
625 | bestTrackParamAtCluster = extrapTrackParamAtCluster; | |
626 | } | |
627 | ||
628 | } | |
629 | ||
630 | } | |
631 | ||
632 | // fill out the best track if required else clean up the fRecTracksPtr array | |
a0dc65b4 | 633 | if (!GetRecoParam()->TrackAllTracks()) { |
9bf6860b | 634 | if (foundOneCluster) { |
635 | UpdateTrack(trackCandidate,bestTrackParamAtCluster,bestAddChi2TrackAtCluster); | |
636 | ||
637 | // Printout for debuging | |
638 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
639 | cout << "FollowTrackInChamber: added the best cluster in chamber(1..): " << bestTrackParamAtCluster.GetClusterPtr()->GetChamberId()+1 << endl; | |
640 | if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump(); | |
641 | } | |
642 | ||
643 | } else return kFALSE; | |
644 | ||
645 | } else if (foundOneCluster) { | |
646 | ||
647 | // remove obsolete track | |
648 | fRecTracksPtr->Remove(&trackCandidate); | |
649 | fNRecTracks--; | |
650 | ||
651 | } else return kFALSE; | |
652 | ||
653 | return kTRUE; | |
654 | ||
ea94c18b | 655 | } |
b0e4c598 | 656 | |
ea94c18b | 657 | //__________________________________________________________________________ |
1fef78c8 | 658 | Bool_t AliMUONTrackReconstructorK::FollowTrackInStation(AliMUONTrack &trackCandidate, AliMUONVClusterStore& clusterStore, Int_t nextStation) |
ea94c18b | 659 | { |
96ebe67e | 660 | /// Follow trackCandidate in station(0..) nextStation and search for compatible cluster(s) |
ea94c18b | 661 | /// Keep all possibilities or only the best one(s) according to the flag fgkTrackAllTracks: |
662 | /// kTRUE: duplicate "trackCandidate" if there are several possibilities and add the new tracks at the end of | |
663 | /// fRecTracksPtr to avoid conficts with other track candidates at this current stage of the tracking procedure. | |
664 | /// Remove the obsolete "trackCandidate" at the end. | |
96ebe67e | 665 | /// kFALSE: add only the best cluster(s) to the "trackCandidate". Try to add a couple of clusters in priority. |
666 | /// return kTRUE if new cluster(s) have been found (otherwise return kFALSE) | |
ea94c18b | 667 | AliDebug(1,Form("Enter FollowTrackInStation(1..) %d", nextStation+1)); |
668 | ||
669 | // Order the chamber according to the propagation direction (tracking starts with chamber 2): | |
670 | // - nextStation == station(1...) 5 => forward propagation | |
671 | // - nextStation < station(1...) 5 => backward propagation | |
672 | Int_t ch1, ch2; | |
673 | if (nextStation==4) { | |
674 | ch1 = 2*nextStation+1; | |
675 | ch2 = 2*nextStation; | |
676 | } else { | |
677 | ch1 = 2*nextStation; | |
678 | ch2 = 2*nextStation+1; | |
679 | } | |
680 | ||
96ebe67e | 681 | Double_t chi2OfCluster; |
a0dc65b4 | 682 | Double_t maxChi2OfCluster = 2. * GetRecoParam()->GetSigmaCutForTracking() * |
683 | GetRecoParam()->GetSigmaCutForTracking(); // 2 because 2 quantities in chi2 | |
96ebe67e | 684 | Double_t addChi2TrackAtCluster1; |
685 | Double_t addChi2TrackAtCluster2; | |
4ea3f013 | 686 | Double_t bestAddChi2TrackAtCluster1 = AliMUONTrack::MaxChi2(); |
687 | Double_t bestAddChi2TrackAtCluster2 = AliMUONTrack::MaxChi2(); | |
96ebe67e | 688 | Bool_t foundOneCluster = kFALSE; |
689 | Bool_t foundTwoClusters = kFALSE; | |
ea94c18b | 690 | AliMUONTrack *newTrack = 0x0; |
96ebe67e | 691 | AliMUONVCluster *clusterCh1, *clusterCh2; |
ea94c18b | 692 | AliMUONTrackParam extrapTrackParam; |
7332f213 | 693 | AliMUONTrackParam extrapTrackParamAtCh; |
96ebe67e | 694 | AliMUONTrackParam extrapTrackParamAtCluster1; |
695 | AliMUONTrackParam extrapTrackParamAtCluster2; | |
696 | AliMUONTrackParam bestTrackParamAtCluster1; | |
697 | AliMUONTrackParam bestTrackParamAtCluster2; | |
698 | ||
7332f213 | 699 | // Get track parameters according to the propagation direction |
7332f213 | 700 | if (nextStation==4) extrapTrackParamAtCh = *(AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->Last(); |
701 | else extrapTrackParamAtCh = *(AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->First(); | |
ea94c18b | 702 | |
9bf6860b | 703 | // Printout for debuging |
704 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 2) || (AliLog::GetGlobalDebugLevel() >= 2)) { | |
705 | cout<<endl<<"Track parameters and covariances at first cluster:"<<endl; | |
706 | extrapTrackParamAtCh.GetParameters().Print(); | |
707 | extrapTrackParamAtCh.GetCovariances().Print(); | |
708 | } | |
709 | ||
ea94c18b | 710 | // Add MCS effect |
4663da9f | 711 | Int_t currentChamber = extrapTrackParamAtCh.GetClusterPtr()->GetChamberId(); |
712 | AliMUONTrackExtrap::AddMCSEffect(&extrapTrackParamAtCh,AliMUONConstants::ChamberThicknessInX0(currentChamber),-1.); | |
ea94c18b | 713 | |
714 | // reset propagator for smoother | |
a0dc65b4 | 715 | if (GetRecoParam()->UseSmoother()) extrapTrackParamAtCh.ResetPropagator(); |
ea94c18b | 716 | |
9bf6860b | 717 | // Add MCS in the missing chamber(s) if any |
9bf6860b | 718 | while (ch1 < ch2 && currentChamber > ch2 + 1) { |
ea94c18b | 719 | // extrapolation to the missing chamber |
9bf6860b | 720 | currentChamber--; |
4ea3f013 | 721 | if (!AliMUONTrackExtrap::ExtrapToZCov(&extrapTrackParamAtCh, AliMUONConstants::DefaultChamberZ(currentChamber), |
722 | GetRecoParam()->UseSmoother())) return kFALSE; | |
ea94c18b | 723 | // add MCS effect |
4663da9f | 724 | AliMUONTrackExtrap::AddMCSEffect(&extrapTrackParamAtCh,AliMUONConstants::ChamberThicknessInX0(currentChamber),-1.); |
ea94c18b | 725 | } |
726 | ||
727 | //Extrapolate trackCandidate to chamber "ch2" | |
4ea3f013 | 728 | if (!AliMUONTrackExtrap::ExtrapToZCov(&extrapTrackParamAtCh, AliMUONConstants::DefaultChamberZ(ch2), |
729 | GetRecoParam()->UseSmoother())) return kFALSE; | |
ea94c18b | 730 | |
731 | // Printout for debuging | |
732 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 2) || (AliLog::GetGlobalDebugLevel() >= 2)) { | |
9bf6860b | 733 | cout<<endl<<"Track parameters and covariances at first cluster extrapolated to z = "<<AliMUONConstants::DefaultChamberZ(ch2)<<":"<<endl; |
734 | extrapTrackParamAtCh.GetParameters().Print(); | |
019df241 | 735 | extrapTrackParamAtCh.GetCovariances().Print(); |
ea94c18b | 736 | } |
737 | ||
738 | // Printout for debuging | |
739 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
96ebe67e | 740 | cout << "FollowTrackInStation: look for clusters in chamber(1..): " << ch2+1 << endl; |
ea94c18b | 741 | } |
742 | ||
1fef78c8 | 743 | // Ask the clustering to reconstruct new clusters around the track position in the current station |
744 | // except for station 4 and 5 that are already entirely clusterized | |
a0dc65b4 | 745 | if (GetRecoParam()->CombineClusterTrackReco()) { |
1fef78c8 | 746 | if (nextStation < 3) AskForNewClustersInStation(extrapTrackParamAtCh, clusterStore, nextStation); |
747 | } | |
748 | ||
4ea3f013 | 749 | Int_t nClusters = clusterStore.GetSize(); |
750 | Bool_t *clusterCh1Used = new Bool_t[nClusters]; | |
751 | for (Int_t i = 0; i < nClusters; i++) clusterCh1Used[i] = kFALSE; | |
752 | Int_t iCluster1; | |
753 | ||
96ebe67e | 754 | // Create iterators to loop over clusters in both chambers |
755 | TIter nextInCh1(clusterStore.CreateChamberIterator(ch1,ch1)); | |
756 | TIter nextInCh2(clusterStore.CreateChamberIterator(ch2,ch2)); | |
757 | ||
758 | // look for candidates in chamber 2 | |
759 | while ( ( clusterCh2 = static_cast<AliMUONVCluster*>(nextInCh2()) ) ) { | |
ea94c18b | 760 | |
96ebe67e | 761 | // try to add the current cluster fast |
762 | if (!TryOneClusterFast(extrapTrackParamAtCh, clusterCh2)) continue; | |
019df241 | 763 | |
96ebe67e | 764 | // try to add the current cluster accuratly |
765 | chi2OfCluster = TryOneCluster(extrapTrackParamAtCh, clusterCh2, extrapTrackParamAtCluster2, | |
a0dc65b4 | 766 | GetRecoParam()->UseSmoother()); |
ea94c18b | 767 | |
96ebe67e | 768 | // if good chi2 then try to attach a cluster in the other chamber too |
769 | if (chi2OfCluster < maxChi2OfCluster) { | |
ea94c18b | 770 | |
a0dc65b4 | 771 | if (GetRecoParam()->UseSmoother()) { |
ea94c18b | 772 | // save extrapolated parameters for smoother |
96ebe67e | 773 | extrapTrackParamAtCluster2.SetExtrapParameters(extrapTrackParamAtCluster2.GetParameters()); |
ea94c18b | 774 | |
775 | // save extrapolated covariance matrix for smoother | |
96ebe67e | 776 | extrapTrackParamAtCluster2.SetExtrapCovariances(extrapTrackParamAtCluster2.GetCovariances()); |
ea94c18b | 777 | } |
778 | ||
96ebe67e | 779 | // Compute new track parameters including "clusterCh2" using kalman filter |
780 | addChi2TrackAtCluster2 = RunKalmanFilter(extrapTrackParamAtCluster2); | |
ea94c18b | 781 | |
6b191dea | 782 | // skip track out of limits |
783 | if (!IsAcceptable(extrapTrackParamAtCluster2)) continue; | |
89c8d66d | 784 | |
785 | // Printout for debuging | |
786 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
787 | cout << "FollowTrackInStation: found one cluster in chamber(1..): " << ch2+1 | |
788 | << " (Chi2 = " << chi2OfCluster << ")" << endl; | |
789 | clusterCh2->Print(); | |
790 | cout << " look for second clusters in chamber(1..): " << ch1+1 << " ..." << endl; | |
791 | } | |
792 | ||
ea94c18b | 793 | // copy new track parameters for next step |
96ebe67e | 794 | extrapTrackParam = extrapTrackParamAtCluster2; |
ea94c18b | 795 | |
796 | // add MCS effect | |
4663da9f | 797 | AliMUONTrackExtrap::AddMCSEffect(&extrapTrackParam,AliMUONConstants::ChamberThicknessInX0(ch2),-1.); |
ea94c18b | 798 | |
799 | // reset propagator for smoother | |
a0dc65b4 | 800 | if (GetRecoParam()->UseSmoother()) extrapTrackParam.ResetPropagator(); |
ea94c18b | 801 | |
019df241 | 802 | //Extrapolate track parameters to chamber "ch1" |
4ea3f013 | 803 | Bool_t normalExtrap = AliMUONTrackExtrap::ExtrapToZCov(&extrapTrackParam, AliMUONConstants::DefaultChamberZ(ch1), |
804 | GetRecoParam()->UseSmoother()); | |
019df241 | 805 | |
96ebe67e | 806 | // reset cluster iterator of chamber 1 |
807 | nextInCh1.Reset(); | |
808 | iCluster1 = -1; | |
809 | ||
810 | // look for second candidates in chamber 1 | |
89c8d66d | 811 | Bool_t foundSecondCluster = kFALSE; |
4ea3f013 | 812 | if (normalExtrap) while ( ( clusterCh1 = static_cast<AliMUONVCluster*>(nextInCh1()) ) ) { |
96ebe67e | 813 | iCluster1++; |
ea94c18b | 814 | |
96ebe67e | 815 | // try to add the current cluster fast |
816 | if (!TryOneClusterFast(extrapTrackParam, clusterCh1)) continue; | |
019df241 | 817 | |
96ebe67e | 818 | // try to add the current cluster accuratly |
819 | chi2OfCluster = TryOneCluster(extrapTrackParam, clusterCh1, extrapTrackParamAtCluster1, | |
a0dc65b4 | 820 | GetRecoParam()->UseSmoother()); |
019df241 | 821 | |
96ebe67e | 822 | // if good chi2 then consider to add the 2 clusters to the "trackCandidate" |
823 | if (chi2OfCluster < maxChi2OfCluster) { | |
019df241 | 824 | |
a0dc65b4 | 825 | if (GetRecoParam()->UseSmoother()) { |
ea94c18b | 826 | // save extrapolated parameters for smoother |
96ebe67e | 827 | extrapTrackParamAtCluster1.SetExtrapParameters(extrapTrackParamAtCluster1.GetParameters()); |
ea94c18b | 828 | |
829 | // save extrapolated covariance matrix for smoother | |
96ebe67e | 830 | extrapTrackParamAtCluster1.SetExtrapCovariances(extrapTrackParamAtCluster1.GetCovariances()); |
ea94c18b | 831 | } |
832 | ||
96ebe67e | 833 | // Compute new track parameters including "clusterCh1" using kalman filter |
834 | addChi2TrackAtCluster1 = RunKalmanFilter(extrapTrackParamAtCluster1); | |
ea94c18b | 835 | |
6b191dea | 836 | // skip track out of limits |
837 | if (!IsAcceptable(extrapTrackParamAtCluster1)) continue; | |
89c8d66d | 838 | |
839 | // remember a second cluster was found | |
840 | foundSecondCluster = kTRUE; | |
841 | foundTwoClusters = kTRUE; | |
842 | ||
843 | // Printout for debuging | |
844 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
845 | cout << "FollowTrackInStation: found one cluster in chamber(1..): " << ch1+1 | |
846 | << " (Chi2 = " << chi2OfCluster << ")" << endl; | |
847 | clusterCh1->Print(); | |
848 | } | |
9bf6860b | 849 | |
a0dc65b4 | 850 | if (GetRecoParam()->TrackAllTracks()) { |
96ebe67e | 851 | // copy trackCandidate into a new track put at the end of fRecTracksPtr and add the new clusters |
ea94c18b | 852 | newTrack = new ((*fRecTracksPtr)[fRecTracksPtr->GetLast()+1]) AliMUONTrack(trackCandidate); |
96ebe67e | 853 | UpdateTrack(*newTrack,extrapTrackParamAtCluster1,extrapTrackParamAtCluster2,addChi2TrackAtCluster1,addChi2TrackAtCluster2); |
ea94c18b | 854 | fNRecTracks++; |
855 | ||
96ebe67e | 856 | // Tag clusterCh1 as used |
857 | clusterCh1Used[iCluster1] = kTRUE; | |
ea94c18b | 858 | |
859 | // Printout for debuging | |
860 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
96ebe67e | 861 | cout << "FollowTrackInStation: added two clusters in station(1..): " << nextStation+1 << endl; |
ea94c18b | 862 | if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump(); |
863 | } | |
864 | ||
96ebe67e | 865 | } else if (addChi2TrackAtCluster1+addChi2TrackAtCluster2 < bestAddChi2TrackAtCluster1+bestAddChi2TrackAtCluster2) { |
866 | // keep track of the best couple of clusters | |
867 | bestAddChi2TrackAtCluster1 = addChi2TrackAtCluster1; | |
868 | bestAddChi2TrackAtCluster2 = addChi2TrackAtCluster2; | |
869 | bestTrackParamAtCluster1 = extrapTrackParamAtCluster1; | |
870 | bestTrackParamAtCluster2 = extrapTrackParamAtCluster2; | |
ea94c18b | 871 | } |
872 | ||
b0e4c598 | 873 | } |
ea94c18b | 874 | |
8cc77df0 | 875 | } |
ea94c18b | 876 | |
96ebe67e | 877 | // if no clusterCh1 found then consider to add clusterCh2 only |
878 | if (!foundSecondCluster) { | |
89c8d66d | 879 | |
880 | // remember a cluster was found | |
96ebe67e | 881 | foundOneCluster = kTRUE; |
ea94c18b | 882 | |
a0dc65b4 | 883 | if (GetRecoParam()->TrackAllTracks()) { |
96ebe67e | 884 | // copy trackCandidate into a new track put at the end of fRecTracksPtr and add the new cluster |
ea94c18b | 885 | newTrack = new ((*fRecTracksPtr)[fRecTracksPtr->GetLast()+1]) AliMUONTrack(trackCandidate); |
96ebe67e | 886 | UpdateTrack(*newTrack,extrapTrackParamAtCluster2,addChi2TrackAtCluster2); |
ea94c18b | 887 | fNRecTracks++; |
888 | ||
ea94c18b | 889 | // Printout for debuging |
890 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
96ebe67e | 891 | cout << "FollowTrackInStation: added one cluster in chamber(1..): " << ch2+1 << endl; |
ea94c18b | 892 | if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump(); |
893 | } | |
894 | ||
96ebe67e | 895 | } else if (!foundTwoClusters && addChi2TrackAtCluster2 < bestAddChi2TrackAtCluster1) { |
896 | // keep track of the best single cluster except if a couple of clusters has already been found | |
897 | bestAddChi2TrackAtCluster1 = addChi2TrackAtCluster2; | |
898 | bestTrackParamAtCluster1 = extrapTrackParamAtCluster2; | |
ea94c18b | 899 | } |
900 | ||
901 | } | |
902 | ||
8cc77df0 | 903 | } |
ea94c18b | 904 | |
905 | } | |
906 | ||
907 | // look for candidates in chamber 1 not already attached to a track | |
96ebe67e | 908 | // if we want to keep all possible tracks or if no good couple of clusters has been found |
a0dc65b4 | 909 | if (GetRecoParam()->TrackAllTracks() || !foundTwoClusters) { |
ea94c18b | 910 | |
ea94c18b | 911 | // add MCS effect for next step |
4663da9f | 912 | AliMUONTrackExtrap::AddMCSEffect(&extrapTrackParamAtCh,AliMUONConstants::ChamberThicknessInX0(ch2),-1.); |
019df241 | 913 | |
914 | //Extrapolate trackCandidate to chamber "ch1" | |
4ea3f013 | 915 | Bool_t normalExtrap = AliMUONTrackExtrap::ExtrapToZCov(&extrapTrackParamAtCh, AliMUONConstants::DefaultChamberZ(ch1), |
916 | GetRecoParam()->UseSmoother()); | |
019df241 | 917 | |
9bf6860b | 918 | // Printout for debuging |
919 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 2) || (AliLog::GetGlobalDebugLevel() >= 2)) { | |
920 | cout<<endl<<"Track parameters and covariances at first cluster extrapolated to z = "<<AliMUONConstants::DefaultChamberZ(ch1)<<":"<<endl; | |
921 | extrapTrackParamAtCh.GetParameters().Print(); | |
922 | extrapTrackParamAtCh.GetCovariances().Print(); | |
923 | } | |
924 | ||
925 | // Printout for debuging | |
926 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
927 | cout << "FollowTrackInStation: look for single clusters in chamber(1..): " << ch1+1 << endl; | |
928 | } | |
929 | ||
96ebe67e | 930 | // reset cluster iterator of chamber 1 |
931 | nextInCh1.Reset(); | |
932 | iCluster1 = -1; | |
933 | ||
934 | // look for second candidates in chamber 1 | |
4ea3f013 | 935 | if (normalExtrap) while ( ( clusterCh1 = static_cast<AliMUONVCluster*>(nextInCh1()) ) ) { |
96ebe67e | 936 | iCluster1++; |
ea94c18b | 937 | |
96ebe67e | 938 | if (clusterCh1Used[iCluster1]) continue; // Skip clusters already used |
ea94c18b | 939 | |
96ebe67e | 940 | // try to add the current cluster fast |
941 | if (!TryOneClusterFast(extrapTrackParamAtCh, clusterCh1)) continue; | |
019df241 | 942 | |
96ebe67e | 943 | // try to add the current cluster accuratly |
944 | chi2OfCluster = TryOneCluster(extrapTrackParamAtCh, clusterCh1, extrapTrackParamAtCluster1, | |
a0dc65b4 | 945 | GetRecoParam()->UseSmoother()); |
019df241 | 946 | |
96ebe67e | 947 | // if good chi2 then consider to add clusterCh1 |
948 | // We do not try to attach a cluster in the other chamber too since it has already been done above | |
949 | if (chi2OfCluster < maxChi2OfCluster) { | |
019df241 | 950 | |
a0dc65b4 | 951 | if (GetRecoParam()->UseSmoother()) { |
ea94c18b | 952 | // save extrapolated parameters for smoother |
96ebe67e | 953 | extrapTrackParamAtCluster1.SetExtrapParameters(extrapTrackParamAtCluster1.GetParameters()); |
ea94c18b | 954 | |
955 | // save extrapolated covariance matrix for smoother | |
96ebe67e | 956 | extrapTrackParamAtCluster1.SetExtrapCovariances(extrapTrackParamAtCluster1.GetCovariances()); |
ea94c18b | 957 | } |
958 | ||
96ebe67e | 959 | // Compute new track parameters including "clusterCh1" using kalman filter |
960 | addChi2TrackAtCluster1 = RunKalmanFilter(extrapTrackParamAtCluster1); | |
ea94c18b | 961 | |
6b191dea | 962 | // skip track out of limits |
963 | if (!IsAcceptable(extrapTrackParamAtCluster1)) continue; | |
89c8d66d | 964 | |
965 | // remember a cluster was found | |
966 | foundOneCluster = kTRUE; | |
967 | ||
968 | // Printout for debuging | |
969 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
970 | cout << "FollowTrackInStation: found one cluster in chamber(1..): " << ch1+1 | |
971 | << " (Chi2 = " << chi2OfCluster << ")" << endl; | |
972 | clusterCh1->Print(); | |
973 | } | |
9bf6860b | 974 | |
a0dc65b4 | 975 | if (GetRecoParam()->TrackAllTracks()) { |
96ebe67e | 976 | // copy trackCandidate into a new track put at the end of fRecTracksPtr and add the new cluster |
ea94c18b | 977 | newTrack = new ((*fRecTracksPtr)[fRecTracksPtr->GetLast()+1]) AliMUONTrack(trackCandidate); |
96ebe67e | 978 | UpdateTrack(*newTrack,extrapTrackParamAtCluster1,addChi2TrackAtCluster1); |
ea94c18b | 979 | fNRecTracks++; |
980 | ||
ea94c18b | 981 | // Printout for debuging |
982 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
96ebe67e | 983 | cout << "FollowTrackInStation: added one cluster in chamber(1..): " << ch1+1 << endl; |
ea94c18b | 984 | if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump(); |
985 | } | |
986 | ||
96ebe67e | 987 | } else if (addChi2TrackAtCluster1 < bestAddChi2TrackAtCluster1) { |
988 | // keep track of the best single cluster except if a couple of clusters has already been found | |
989 | bestAddChi2TrackAtCluster1 = addChi2TrackAtCluster1; | |
990 | bestTrackParamAtCluster1 = extrapTrackParamAtCluster1; | |
ea94c18b | 991 | } |
992 | ||
993 | } | |
994 | ||
8cc77df0 | 995 | } |
ea94c18b | 996 | |
997 | } | |
998 | ||
999 | // fill out the best track if required else clean up the fRecTracksPtr array | |
a0dc65b4 | 1000 | if (!GetRecoParam()->TrackAllTracks()) { |
96ebe67e | 1001 | if (foundTwoClusters) { |
1002 | UpdateTrack(trackCandidate,bestTrackParamAtCluster1,bestTrackParamAtCluster2,bestAddChi2TrackAtCluster1,bestAddChi2TrackAtCluster2); | |
ea94c18b | 1003 | |
ea94c18b | 1004 | // Printout for debuging |
1005 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
96ebe67e | 1006 | cout << "FollowTrackInStation: added the two best clusters in station(1..): " << nextStation+1 << endl; |
ea94c18b | 1007 | if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump(); |
1008 | } | |
1009 | ||
96ebe67e | 1010 | } else if (foundOneCluster) { |
1011 | UpdateTrack(trackCandidate,bestTrackParamAtCluster1,bestAddChi2TrackAtCluster1); | |
ea94c18b | 1012 | |
ea94c18b | 1013 | // Printout for debuging |
1014 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
96ebe67e | 1015 | cout << "FollowTrackInStation: added the best cluster in chamber(1..): " << bestTrackParamAtCluster1.GetClusterPtr()->GetChamberId()+1 << endl; |
ea94c18b | 1016 | if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump(); |
1017 | } | |
1018 | ||
17773e2e | 1019 | } else { |
96ebe67e | 1020 | delete [] clusterCh1Used; |
17773e2e | 1021 | return kFALSE; |
1022 | } | |
9bf6860b | 1023 | |
96ebe67e | 1024 | } else if (foundOneCluster || foundTwoClusters) { |
ea94c18b | 1025 | |
1026 | // remove obsolete track | |
1027 | fRecTracksPtr->Remove(&trackCandidate); | |
1028 | fNRecTracks--; | |
1029 | ||
17773e2e | 1030 | } else { |
96ebe67e | 1031 | delete [] clusterCh1Used; |
17773e2e | 1032 | return kFALSE; |
9bf6860b | 1033 | } |
1034 | ||
96ebe67e | 1035 | delete [] clusterCh1Used; |
ea94c18b | 1036 | return kTRUE; |
1037 | ||
1038 | } | |
8cc77df0 | 1039 | |
ea94c18b | 1040 | //__________________________________________________________________________ |
96ebe67e | 1041 | Double_t AliMUONTrackReconstructorK::RunKalmanFilter(AliMUONTrackParam &trackParamAtCluster) |
ea94c18b | 1042 | { |
96ebe67e | 1043 | /// Compute new track parameters and their covariances including new cluster using kalman filter |
ea94c18b | 1044 | /// return the additional track chi2 |
1045 | AliDebug(1,"Enter RunKalmanFilter"); | |
1046 | ||
1047 | // Get actual track parameters (p) | |
96ebe67e | 1048 | TMatrixD param(trackParamAtCluster.GetParameters()); |
ea94c18b | 1049 | |
96ebe67e | 1050 | // Get new cluster parameters (m) |
1051 | AliMUONVCluster *cluster = trackParamAtCluster.GetClusterPtr(); | |
1052 | TMatrixD clusterParam(5,1); | |
1053 | clusterParam.Zero(); | |
1054 | clusterParam(0,0) = cluster->GetX(); | |
1055 | clusterParam(2,0) = cluster->GetY(); | |
ea94c18b | 1056 | |
1057 | // Compute the actual parameter weight (W) | |
96ebe67e | 1058 | TMatrixD paramWeight(trackParamAtCluster.GetCovariances()); |
ea94c18b | 1059 | if (paramWeight.Determinant() != 0) { |
1060 | paramWeight.Invert(); | |
1061 | } else { | |
1062 | AliWarning(" Determinant = 0"); | |
4ea3f013 | 1063 | return 2.*AliMUONTrack::MaxChi2(); |
8cc77df0 | 1064 | } |
ea94c18b | 1065 | |
96ebe67e | 1066 | // Compute the new cluster weight (U) |
1067 | TMatrixD clusterWeight(5,5); | |
1068 | clusterWeight.Zero(); | |
1069 | clusterWeight(0,0) = 1. / cluster->GetErrX2(); | |
1070 | clusterWeight(2,2) = 1. / cluster->GetErrY2(); | |
8cc77df0 | 1071 | |
ea94c18b | 1072 | // Compute the new parameters covariance matrix ( (W+U)^-1 ) |
96ebe67e | 1073 | TMatrixD newParamCov(paramWeight,TMatrixD::kPlus,clusterWeight); |
ea94c18b | 1074 | if (newParamCov.Determinant() != 0) { |
1075 | newParamCov.Invert(); | |
1076 | } else { | |
1077 | AliWarning(" Determinant = 0"); | |
4ea3f013 | 1078 | return 2.*AliMUONTrack::MaxChi2(); |
ea94c18b | 1079 | } |
1080 | ||
1081 | // Save the new parameters covariance matrix | |
96ebe67e | 1082 | trackParamAtCluster.SetCovariances(newParamCov); |
ea94c18b | 1083 | |
1084 | // Compute the new parameters (p' = ((W+U)^-1)U(m-p) + p) | |
96ebe67e | 1085 | TMatrixD tmp(clusterParam,TMatrixD::kMinus,param); |
1086 | TMatrixD tmp2(clusterWeight,TMatrixD::kMult,tmp); // U(m-p) | |
ea94c18b | 1087 | TMatrixD newParam(newParamCov,TMatrixD::kMult,tmp2); // ((W+U)^-1)U(m-p) |
1088 | newParam += param; // ((W+U)^-1)U(m-p) + p | |
1089 | ||
1090 | // Save the new parameters | |
96ebe67e | 1091 | trackParamAtCluster.SetParameters(newParam); |
ea94c18b | 1092 | |
1093 | // Compute the additional chi2 (= ((p'-p)^-1)W(p'-p) + ((p'-m)^-1)U(p'-m)) | |
1094 | tmp = newParam; // p' | |
1095 | tmp -= param; // (p'-p) | |
1096 | TMatrixD tmp3(paramWeight,TMatrixD::kMult,tmp); // W(p'-p) | |
1097 | TMatrixD addChi2Track(tmp,TMatrixD::kTransposeMult,tmp3); // ((p'-p)^-1)W(p'-p) | |
1098 | tmp = newParam; // p' | |
96ebe67e | 1099 | tmp -= clusterParam; // (p'-m) |
1100 | TMatrixD tmp4(clusterWeight,TMatrixD::kMult,tmp); // U(p'-m) | |
ea94c18b | 1101 | addChi2Track += TMatrixD(tmp,TMatrixD::kTransposeMult,tmp4); // ((p'-p)^-1)W(p'-p) + ((p'-m)^-1)U(p'-m) |
1102 | ||
1103 | return addChi2Track(0,0); | |
1104 | ||
8cc77df0 | 1105 | } |
1106 | ||
ea94c18b | 1107 | //__________________________________________________________________________ |
96ebe67e | 1108 | void AliMUONTrackReconstructorK::UpdateTrack(AliMUONTrack &track, AliMUONTrackParam &trackParamAtCluster, Double_t addChi2) |
8cc77df0 | 1109 | { |
96ebe67e | 1110 | /// Add 1 cluster to the track candidate |
ea94c18b | 1111 | /// Update chi2 of the track |
1112 | ||
9bf6860b | 1113 | // Flag cluster as being (not) removable |
a0dc65b4 | 1114 | if (GetRecoParam()->RequestStation(trackParamAtCluster.GetClusterPtr()->GetChamberId()/2)) |
9bf6860b | 1115 | trackParamAtCluster.SetRemovable(kFALSE); |
1116 | else trackParamAtCluster.SetRemovable(kTRUE); | |
96ebe67e | 1117 | trackParamAtCluster.SetLocalChi2(0.); // --> Local chi2 not used |
5f4ceff2 | 1118 | |
96ebe67e | 1119 | // Update the track chi2 into trackParamAtCluster |
1120 | trackParamAtCluster.SetTrackChi2(track.GetGlobalChi2() + addChi2); | |
ea94c18b | 1121 | |
1122 | // Update the chi2 of the new track | |
96ebe67e | 1123 | track.SetGlobalChi2(trackParamAtCluster.GetTrackChi2()); |
ea94c18b | 1124 | |
96ebe67e | 1125 | // Update array of TrackParamAtCluster |
1126 | track.AddTrackParamAtCluster(trackParamAtCluster,*(trackParamAtCluster.GetClusterPtr())); | |
ea94c18b | 1127 | |
1128 | } | |
8cc77df0 | 1129 | |
ea94c18b | 1130 | //__________________________________________________________________________ |
96ebe67e | 1131 | void AliMUONTrackReconstructorK::UpdateTrack(AliMUONTrack &track, AliMUONTrackParam &trackParamAtCluster1, AliMUONTrackParam &trackParamAtCluster2, |
1132 | Double_t addChi2AtCluster1, Double_t addChi2AtCluster2) | |
ea94c18b | 1133 | { |
96ebe67e | 1134 | /// Add 2 clusters to the track candidate (order is important) |
ea94c18b | 1135 | /// Update track and local chi2 |
1136 | ||
96ebe67e | 1137 | // Update local chi2 at first cluster |
1138 | AliMUONVCluster* cluster1 = trackParamAtCluster1.GetClusterPtr(); | |
1139 | Double_t deltaX = trackParamAtCluster1.GetNonBendingCoor() - cluster1->GetX(); | |
1140 | Double_t deltaY = trackParamAtCluster1.GetBendingCoor() - cluster1->GetY(); | |
1141 | Double_t localChi2AtCluster1 = deltaX*deltaX / cluster1->GetErrX2() + | |
1142 | deltaY*deltaY / cluster1->GetErrY2(); | |
1143 | trackParamAtCluster1.SetLocalChi2(localChi2AtCluster1); | |
ea94c18b | 1144 | |
96ebe67e | 1145 | // Flag first cluster as being removable |
1146 | trackParamAtCluster1.SetRemovable(kTRUE); | |
ea94c18b | 1147 | |
96ebe67e | 1148 | // Update local chi2 at second cluster |
1149 | AliMUONVCluster* cluster2 = trackParamAtCluster2.GetClusterPtr(); | |
1150 | AliMUONTrackParam extrapTrackParamAtCluster2(trackParamAtCluster1); | |
1151 | AliMUONTrackExtrap::ExtrapToZ(&extrapTrackParamAtCluster2, trackParamAtCluster2.GetZ()); | |
1152 | deltaX = extrapTrackParamAtCluster2.GetNonBendingCoor() - cluster2->GetX(); | |
1153 | deltaY = extrapTrackParamAtCluster2.GetBendingCoor() - cluster2->GetY(); | |
1154 | Double_t localChi2AtCluster2 = deltaX*deltaX / cluster2->GetErrX2() + | |
1155 | deltaY*deltaY / cluster2->GetErrY2(); | |
1156 | trackParamAtCluster2.SetLocalChi2(localChi2AtCluster2); | |
ea94c18b | 1157 | |
96ebe67e | 1158 | // Flag second cluster as being removable |
1159 | trackParamAtCluster2.SetRemovable(kTRUE); | |
ea94c18b | 1160 | |
96ebe67e | 1161 | // Update the track chi2 into trackParamAtCluster2 |
1162 | trackParamAtCluster2.SetTrackChi2(track.GetGlobalChi2() + addChi2AtCluster2); | |
ea94c18b | 1163 | |
96ebe67e | 1164 | // Update the track chi2 into trackParamAtCluster1 |
1165 | trackParamAtCluster1.SetTrackChi2(trackParamAtCluster2.GetTrackChi2() + addChi2AtCluster1); | |
ea94c18b | 1166 | |
1167 | // Update the chi2 of the new track | |
96ebe67e | 1168 | track.SetGlobalChi2(trackParamAtCluster1.GetTrackChi2()); |
ea94c18b | 1169 | |
96ebe67e | 1170 | // Update array of trackParamAtCluster |
1171 | track.AddTrackParamAtCluster(trackParamAtCluster1,*cluster1); | |
1172 | track.AddTrackParamAtCluster(trackParamAtCluster2,*cluster2); | |
ea94c18b | 1173 | |
1174 | } | |
8cc77df0 | 1175 | |
ea94c18b | 1176 | //__________________________________________________________________________ |
1fef78c8 | 1177 | Bool_t AliMUONTrackReconstructorK::RecoverTrack(AliMUONTrack &trackCandidate, AliMUONVClusterStore& clusterStore, Int_t nextStation) |
ea94c18b | 1178 | { |
1179 | /// Try to recover the track candidate in the next station | |
96ebe67e | 1180 | /// by removing the worst of the two clusters attached in the current station |
ea94c18b | 1181 | /// Return kTRUE if recovering succeeds |
1182 | AliDebug(1,"Enter RecoverTrack"); | |
1183 | ||
96ebe67e | 1184 | // Do not try to recover track until we have attached cluster(s) on station(1..) 3 |
ea94c18b | 1185 | if (nextStation > 1) return kFALSE; |
1186 | ||
96ebe67e | 1187 | Int_t worstClusterNumber = -1; |
9bf6860b | 1188 | Double_t localChi2, worstLocalChi2 = -1.; |
ea94c18b | 1189 | |
96ebe67e | 1190 | // Look for the cluster to remove |
1191 | for (Int_t clusterNumber = 0; clusterNumber < 2; clusterNumber++) { | |
1192 | AliMUONTrackParam *trackParamAtCluster = (AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->UncheckedAt(clusterNumber); | |
ea94c18b | 1193 | |
9bf6860b | 1194 | // check if current cluster is in the previous station |
1195 | if (trackParamAtCluster->GetClusterPtr()->GetChamberId()/2 != nextStation+1) break; | |
1196 | ||
96ebe67e | 1197 | // check if current cluster is removable |
1198 | if (!trackParamAtCluster->IsRemovable()) return kFALSE; | |
ea94c18b | 1199 | |
9bf6860b | 1200 | // reset the current cluster as being not removable if it is on a required station |
a0dc65b4 | 1201 | if (GetRecoParam()->RequestStation(nextStation+1)) trackParamAtCluster->SetRemovable(kFALSE); |
9bf6860b | 1202 | |
96ebe67e | 1203 | // Pick up cluster with the worst chi2 |
1204 | localChi2 = trackParamAtCluster->GetLocalChi2(); | |
1205 | if (localChi2 > worstLocalChi2) { | |
1206 | worstLocalChi2 = localChi2; | |
1207 | worstClusterNumber = clusterNumber; | |
8cc77df0 | 1208 | } |
ea94c18b | 1209 | } |
1210 | ||
9bf6860b | 1211 | // check if worst cluster found |
1212 | if (worstClusterNumber < 0) return kFALSE; | |
ea94c18b | 1213 | |
96ebe67e | 1214 | // Remove the worst cluster |
1215 | trackCandidate.RemoveTrackParamAtCluster((AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->UncheckedAt(worstClusterNumber)); | |
ea94c18b | 1216 | |
96ebe67e | 1217 | // Re-calculate track parameters at the (new) first cluster |
4ea3f013 | 1218 | if (!RetracePartialTrack(trackCandidate,(AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->UncheckedAt(1))) return kFALSE; |
ea94c18b | 1219 | |
6b191dea | 1220 | // skip track out of limits |
1221 | if (!IsAcceptable(*((AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->First()))) return kFALSE; | |
9bf6860b | 1222 | |
96ebe67e | 1223 | // Look for new cluster(s) in next station |
1224 | return FollowTrackInStation(trackCandidate, clusterStore, nextStation); | |
ea94c18b | 1225 | |
8cc77df0 | 1226 | } |
1227 | ||
1228 | //__________________________________________________________________________ | |
ea94c18b | 1229 | Bool_t AliMUONTrackReconstructorK::RunSmoother(AliMUONTrack &track) |
8cc77df0 | 1230 | { |
ea94c18b | 1231 | /// Compute new track parameters and their covariances using smoother |
3304fa09 | 1232 | AliDebug(1,"Enter UseSmoother"); |
ea94c18b | 1233 | |
96ebe67e | 1234 | AliMUONTrackParam *previousTrackParam = (AliMUONTrackParam*) track.GetTrackParamAtCluster()->First(); |
ea94c18b | 1235 | |
96ebe67e | 1236 | // Smoothed parameters and covariances at first cluster = filtered parameters and covariances |
ea94c18b | 1237 | previousTrackParam->SetSmoothParameters(previousTrackParam->GetParameters()); |
1238 | previousTrackParam->SetSmoothCovariances(previousTrackParam->GetCovariances()); | |
d1e6fdee | 1239 | |
1240 | AliMUONTrackParam *currentTrackParam = (AliMUONTrackParam*) track.GetTrackParamAtCluster()->After(previousTrackParam); | |
ea94c18b | 1241 | |
d1e6fdee | 1242 | // Save local chi2 at first cluster = last additional chi2 provided by Kalman |
1243 | previousTrackParam->SetLocalChi2(previousTrackParam->GetTrackChi2() - currentTrackParam->GetTrackChi2()); | |
ea94c18b | 1244 | |
ff078154 | 1245 | // if the track contains only 2 clusters simply copy the filtered parameters |
1246 | if (track.GetNClusters() == 2) { | |
1247 | currentTrackParam->SetSmoothParameters(currentTrackParam->GetParameters()); | |
1248 | currentTrackParam->SetSmoothCovariances(currentTrackParam->GetCovariances()); | |
1249 | currentTrackParam->SetLocalChi2(currentTrackParam->GetTrackChi2()); | |
1250 | return kTRUE; | |
1251 | } | |
1252 | ||
ea94c18b | 1253 | while (currentTrackParam) { |
1254 | ||
1255 | // Get variables | |
1256 | const TMatrixD &extrapParameters = previousTrackParam->GetExtrapParameters(); // X(k+1 k) | |
1257 | const TMatrixD &filteredParameters = currentTrackParam->GetParameters(); // X(k k) | |
1258 | const TMatrixD &previousSmoothParameters = previousTrackParam->GetSmoothParameters(); // X(k+1 n) | |
1259 | const TMatrixD &propagator = previousTrackParam->GetPropagator(); // F(k) | |
1260 | const TMatrixD &extrapCovariances = previousTrackParam->GetExtrapCovariances(); // C(k+1 k) | |
1261 | const TMatrixD &filteredCovariances = currentTrackParam->GetCovariances(); // C(k k) | |
1262 | const TMatrixD &previousSmoothCovariances = previousTrackParam->GetSmoothCovariances(); // C(k+1 n) | |
1263 | ||
d1e6fdee | 1264 | // Compute smoother gain: A(k) = C(kk) * F(k)^t * (C(k+1 k))^-1 |
ea94c18b | 1265 | TMatrixD extrapWeight(extrapCovariances); |
1266 | if (extrapWeight.Determinant() != 0) { | |
1267 | extrapWeight.Invert(); // (C(k+1 k))^-1 | |
1268 | } else { | |
1269 | AliWarning(" Determinant = 0"); | |
1270 | return kFALSE; | |
1271 | } | |
d1e6fdee | 1272 | TMatrixD smootherGain(filteredCovariances,TMatrixD::kMultTranspose,propagator); // C(kk) * F(k)^t |
1273 | smootherGain *= extrapWeight; // C(kk) * F(k)^t * (C(k+1 k))^-1 | |
ea94c18b | 1274 | |
1275 | // Compute smoothed parameters: X(k n) = X(k k) + A(k) * (X(k+1 n) - X(k+1 k)) | |
1276 | TMatrixD tmpParam(previousSmoothParameters,TMatrixD::kMinus,extrapParameters); // X(k+1 n) - X(k+1 k) | |
1277 | TMatrixD smoothParameters(smootherGain,TMatrixD::kMult,tmpParam); // A(k) * (X(k+1 n) - X(k+1 k)) | |
1278 | smoothParameters += filteredParameters; // X(k k) + A(k) * (X(k+1 n) - X(k+1 k)) | |
1279 | ||
1280 | // Save smoothed parameters | |
1281 | currentTrackParam->SetSmoothParameters(smoothParameters); | |
1282 | ||
1283 | // Compute smoothed covariances: C(k n) = C(k k) + A(k) * (C(k+1 n) - C(k+1 k)) * (A(k))^t | |
1284 | TMatrixD tmpCov(previousSmoothCovariances,TMatrixD::kMinus,extrapCovariances); // C(k+1 n) - C(k+1 k) | |
1285 | TMatrixD tmpCov2(tmpCov,TMatrixD::kMultTranspose,smootherGain); // (C(k+1 n) - C(k+1 k)) * (A(k))^t | |
1286 | TMatrixD smoothCovariances(smootherGain,TMatrixD::kMult,tmpCov2); // A(k) * (C(k+1 n) - C(k+1 k)) * (A(k))^t | |
1287 | smoothCovariances += filteredCovariances; // C(k k) + A(k) * (C(k+1 n) - C(k+1 k)) * (A(k))^t | |
1288 | ||
1289 | // Save smoothed covariances | |
1290 | currentTrackParam->SetSmoothCovariances(smoothCovariances); | |
1291 | ||
96ebe67e | 1292 | // Compute smoothed residual: r(k n) = cluster - X(k n) |
d1e6fdee | 1293 | AliMUONVCluster* cluster = currentTrackParam->GetClusterPtr(); |
ea94c18b | 1294 | TMatrixD smoothResidual(2,1); |
1295 | smoothResidual.Zero(); | |
96ebe67e | 1296 | smoothResidual(0,0) = cluster->GetX() - smoothParameters(0,0); |
1297 | smoothResidual(1,0) = cluster->GetY() - smoothParameters(2,0); | |
ea94c18b | 1298 | |
96ebe67e | 1299 | // Compute weight of smoothed residual: W(k n) = (clusterCov - C(k n))^-1 |
ea94c18b | 1300 | TMatrixD smoothResidualWeight(2,2); |
96ebe67e | 1301 | smoothResidualWeight(0,0) = cluster->GetErrX2() - smoothCovariances(0,0); |
ea94c18b | 1302 | smoothResidualWeight(0,1) = - smoothCovariances(0,2); |
1303 | smoothResidualWeight(1,0) = - smoothCovariances(2,0); | |
96ebe67e | 1304 | smoothResidualWeight(1,1) = cluster->GetErrY2() - smoothCovariances(2,2); |
ea94c18b | 1305 | if (smoothResidualWeight.Determinant() != 0) { |
1306 | smoothResidualWeight.Invert(); | |
1307 | } else { | |
1308 | AliWarning(" Determinant = 0"); | |
1309 | return kFALSE; | |
1310 | } | |
1311 | ||
1312 | // Compute local chi2 = (r(k n))^t * W(k n) * r(k n) | |
1313 | TMatrixD tmpChi2(smoothResidual,TMatrixD::kTransposeMult,smoothResidualWeight); // (r(k n))^t * W(k n) | |
1314 | TMatrixD localChi2(tmpChi2,TMatrixD::kMult,smoothResidual); // (r(k n))^t * W(k n) * r(k n) | |
1315 | ||
1316 | // Save local chi2 | |
1317 | currentTrackParam->SetLocalChi2(localChi2(0,0)); | |
1318 | ||
1319 | previousTrackParam = currentTrackParam; | |
96ebe67e | 1320 | currentTrackParam = (AliMUONTrackParam*) track.GetTrackParamAtCluster()->After(previousTrackParam); |
ea94c18b | 1321 | } |
1322 | ||
1323 | return kTRUE; | |
1324 | ||
8cc77df0 | 1325 | } |
1326 | ||
8cc77df0 | 1327 | //__________________________________________________________________________ |
89c8d66d | 1328 | Bool_t AliMUONTrackReconstructorK::ComplementTracks(const AliMUONVClusterStore& clusterStore) |
b709ac13 | 1329 | { |
1330 | /// Complete tracks by adding missing clusters (if there is an overlap between | |
89c8d66d | 1331 | /// two detection elements, the track may have two clusters in the same chamber). |
1332 | /// Recompute track parameters and covariances at each clusters. | |
4ea3f013 | 1333 | /// Remove tracks getting abnormal (i.e. extrapolation failed...) after being complemented. |
1334 | /// Return kTRUE if one or more tracks have been complemented or removed. | |
b709ac13 | 1335 | AliDebug(1,"Enter ComplementTracks"); |
1336 | ||
1337 | Int_t chamberId, detElemId; | |
96ebe67e | 1338 | Double_t chi2OfCluster, addChi2TrackAtCluster, bestAddChi2TrackAtCluster; |
a0dc65b4 | 1339 | Double_t maxChi2OfCluster = 2. * GetRecoParam()->GetSigmaCutForTracking() * |
1340 | GetRecoParam()->GetSigmaCutForTracking(); // 2 because 2 quantities in chi2 | |
89c8d66d | 1341 | Bool_t foundOneCluster, trackModified, hasChanged = kFALSE; |
96ebe67e | 1342 | AliMUONVCluster *cluster; |
1343 | AliMUONTrackParam *trackParam, *previousTrackParam, *nextTrackParam, trackParamAtCluster, bestTrackParamAtCluster; | |
4ea3f013 | 1344 | AliMUONTrack *nextTrack; |
b709ac13 | 1345 | |
b709ac13 | 1346 | AliMUONTrack *track = (AliMUONTrack*) fRecTracksPtr->First(); |
1347 | while (track) { | |
1348 | trackModified = kFALSE; | |
1349 | ||
96ebe67e | 1350 | trackParam = (AliMUONTrackParam*)track->GetTrackParamAtCluster()->First(); |
b709ac13 | 1351 | previousTrackParam = trackParam; |
1352 | while (trackParam) { | |
96ebe67e | 1353 | foundOneCluster = kFALSE; |
4ea3f013 | 1354 | bestAddChi2TrackAtCluster = AliMUONTrack::MaxChi2(); |
96ebe67e | 1355 | chamberId = trackParam->GetClusterPtr()->GetChamberId(); |
1356 | detElemId = trackParam->GetClusterPtr()->GetDetElemId(); | |
b709ac13 | 1357 | |
1358 | // prepare nextTrackParam before adding new cluster because of the sorting | |
96ebe67e | 1359 | nextTrackParam = (AliMUONTrackParam*)track->GetTrackParamAtCluster()->After(trackParam); |
b709ac13 | 1360 | |
96ebe67e | 1361 | // Create iterators to loop over clusters in current chamber |
1362 | TIter nextInCh(clusterStore.CreateChamberIterator(chamberId,chamberId)); | |
b709ac13 | 1363 | |
1364 | // look for one second candidate in the same chamber | |
96ebe67e | 1365 | while ( ( cluster = static_cast<AliMUONVCluster*>(nextInCh()) ) ) { |
b709ac13 | 1366 | |
1367 | // look for a cluster in another detection element | |
96ebe67e | 1368 | if (cluster->GetDetElemId() == detElemId) continue; |
b709ac13 | 1369 | |
96ebe67e | 1370 | // try to add the current cluster fast |
1371 | if (!TryOneClusterFast(*trackParam, cluster)) continue; | |
b709ac13 | 1372 | |
96ebe67e | 1373 | // try to add the current cluster accurately |
b709ac13 | 1374 | // never use track parameters at last cluster because the covariance matrix is meaningless |
96ebe67e | 1375 | if (nextTrackParam) chi2OfCluster = TryOneCluster(*trackParam, cluster, trackParamAtCluster); |
1376 | else chi2OfCluster = TryOneCluster(*previousTrackParam, cluster, trackParamAtCluster); | |
b709ac13 | 1377 | |
1378 | // if good chi2 then consider to add this cluster to the track | |
96ebe67e | 1379 | if (chi2OfCluster < maxChi2OfCluster) { |
b709ac13 | 1380 | |
96ebe67e | 1381 | // Compute local track parameters including current cluster using kalman filter |
1382 | addChi2TrackAtCluster = RunKalmanFilter(trackParamAtCluster); | |
b709ac13 | 1383 | |
1384 | // keep track of the best cluster | |
96ebe67e | 1385 | if (addChi2TrackAtCluster < bestAddChi2TrackAtCluster) { |
1386 | bestAddChi2TrackAtCluster = addChi2TrackAtCluster; | |
1387 | bestTrackParamAtCluster = trackParamAtCluster; | |
1388 | foundOneCluster = kTRUE; | |
b709ac13 | 1389 | } |
1390 | ||
1391 | } | |
1392 | ||
1393 | } | |
1394 | ||
1395 | // add new cluster if any | |
96ebe67e | 1396 | if (foundOneCluster) { |
0e894e58 | 1397 | |
1398 | // Printout for debuging | |
1399 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
1400 | cout << "ComplementTracks: found one cluster in chamber(1..): " << chamberId+1 << endl; | |
1401 | bestTrackParamAtCluster.GetClusterPtr()->Print(); | |
ad3c6eda | 1402 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 2) || (AliLog::GetGlobalDebugLevel() >= 2)) { |
1403 | cout<<endl<<"Track parameters and covariances at cluster:"<<endl; | |
1404 | bestTrackParamAtCluster.GetParameters().Print(); | |
1405 | bestTrackParamAtCluster.GetCovariances().Print(); | |
1406 | } | |
0e894e58 | 1407 | } |
1408 | ||
7332f213 | 1409 | trackParam->SetRemovable(kTRUE); |
1410 | bestTrackParamAtCluster.SetRemovable(kTRUE); | |
1411 | track->AddTrackParamAtCluster(bestTrackParamAtCluster,*(bestTrackParamAtCluster.GetClusterPtr())); | |
b709ac13 | 1412 | trackModified = kTRUE; |
89c8d66d | 1413 | hasChanged = kTRUE; |
b709ac13 | 1414 | } |
1415 | ||
1416 | previousTrackParam = trackParam; | |
1417 | trackParam = nextTrackParam; | |
1418 | } | |
1419 | ||
4ea3f013 | 1420 | // prepare next track |
1421 | nextTrack = (AliMUONTrack*) fRecTracksPtr->After(track); | |
1422 | ||
b709ac13 | 1423 | // re-compute track parameters using kalman filter if needed |
4ea3f013 | 1424 | if (trackModified && !RetraceTrack(*track,kTRUE)) { |
1425 | AliWarning("track modified but problem occur during refitting --> remove track"); | |
1426 | fRecTracksPtr->Remove(track); | |
1427 | fNRecTracks--; | |
1428 | } | |
b709ac13 | 1429 | |
4ea3f013 | 1430 | track = nextTrack; |
b709ac13 | 1431 | } |
1432 | ||
89c8d66d | 1433 | return hasChanged; |
1434 | ||
b709ac13 | 1435 | } |
1436 | ||
1437 | //__________________________________________________________________________ | |
7332f213 | 1438 | void AliMUONTrackReconstructorK::ImproveTrack(AliMUONTrack &track) |
8cc77df0 | 1439 | { |
7332f213 | 1440 | /// Improve the given track by removing removable clusters with local chi2 highter than the defined cut |
1441 | /// Removable clusters are identified by the method AliMUONTrack::TagRemovableClusters() | |
ea94c18b | 1442 | /// Recompute track parameters and covariances at the remaining clusters |
4ea3f013 | 1443 | /// and if something goes wrong (i.e. extrapolation failed...) set track chi2 to max value |
7332f213 | 1444 | AliDebug(1,"Enter ImproveTrack"); |
ea94c18b | 1445 | |
1446 | Double_t localChi2, worstLocalChi2; | |
ff078154 | 1447 | AliMUONTrackParam *trackParamAtCluster, *worstTrackParamAtCluster, *nextTrackParam, *next2nextTrackParam; |
1448 | Int_t nextChamber, next2nextChamber; | |
ea94c18b | 1449 | Bool_t smoothed; |
a0dc65b4 | 1450 | Double_t sigmaCut2 = GetRecoParam()->GetSigmaCutForImprovement() * |
1451 | GetRecoParam()->GetSigmaCutForImprovement(); | |
ea94c18b | 1452 | |
7332f213 | 1453 | while (!track.IsImproved()) { |
ea94c18b | 1454 | |
7332f213 | 1455 | // identify removable clusters |
a0dc65b4 | 1456 | track.TagRemovableClusters(GetRecoParam()->RequestedStationMask()); |
b709ac13 | 1457 | |
7332f213 | 1458 | // Run smoother if required |
1459 | smoothed = kFALSE; | |
a0dc65b4 | 1460 | if (GetRecoParam()->UseSmoother()) smoothed = RunSmoother(track); |
7332f213 | 1461 | |
1462 | // Use standard procedure to compute local chi2 if smoother not required or not working | |
1463 | if (!smoothed) { | |
ea94c18b | 1464 | |
7332f213 | 1465 | // Update track parameters and covariances |
4ea3f013 | 1466 | if (!track.UpdateCovTrackParamAtCluster()) { |
1467 | AliWarning("unable to update track parameters and covariances --> stop improvement"); | |
1468 | // restore the kalman parameters | |
1469 | RetraceTrack(track,kTRUE); | |
1470 | break; | |
1471 | } | |
ea94c18b | 1472 | |
7332f213 | 1473 | // Compute local chi2 of each clusters |
1474 | track.ComputeLocalChi2(kTRUE); | |
1475 | } | |
1476 | ||
1477 | // Look for the cluster to remove | |
1478 | worstTrackParamAtCluster = 0x0; | |
ff078154 | 1479 | worstLocalChi2 = -1.; |
7332f213 | 1480 | trackParamAtCluster = (AliMUONTrackParam*)track.GetTrackParamAtCluster()->First(); |
1481 | while (trackParamAtCluster) { | |
ea94c18b | 1482 | |
7332f213 | 1483 | // save parameters into smooth parameters in case of smoother did not work properly |
a0dc65b4 | 1484 | if (GetRecoParam()->UseSmoother() && !smoothed) { |
7332f213 | 1485 | trackParamAtCluster->SetSmoothParameters(trackParamAtCluster->GetParameters()); |
1486 | trackParamAtCluster->SetSmoothCovariances(trackParamAtCluster->GetCovariances()); | |
ea94c18b | 1487 | } |
1488 | ||
7332f213 | 1489 | // Pick up cluster with the worst chi2 |
1490 | localChi2 = trackParamAtCluster->GetLocalChi2(); | |
1491 | if (localChi2 > worstLocalChi2) { | |
1492 | worstLocalChi2 = localChi2; | |
1493 | worstTrackParamAtCluster = trackParamAtCluster; | |
ea94c18b | 1494 | } |
1495 | ||
7332f213 | 1496 | trackParamAtCluster = (AliMUONTrackParam*)track.GetTrackParamAtCluster()->After(trackParamAtCluster); |
1497 | } | |
1498 | ||
7332f213 | 1499 | // Check whether the worst chi2 is under requirement or not |
1500 | if (worstLocalChi2 < 2. * sigmaCut2) { // 2 because 2 quantities in chi2 | |
1501 | track.SetImproved(kTRUE); | |
1502 | break; | |
1503 | } | |
1504 | ||
1505 | // if the worst cluster is not removable then stop improvement | |
ff078154 | 1506 | if (!worstTrackParamAtCluster->IsRemovable()) { |
1507 | // restore the kalman parameters in case they have been lost | |
1508 | if (!smoothed) RetraceTrack(track,kTRUE); | |
1509 | break; | |
1510 | } | |
7332f213 | 1511 | |
1512 | // get track parameters at cluster next to the one to be removed | |
1513 | nextTrackParam = (AliMUONTrackParam*) track.GetTrackParamAtCluster()->After(worstTrackParamAtCluster); | |
1514 | ||
1515 | // Remove the worst cluster | |
1516 | track.RemoveTrackParamAtCluster(worstTrackParamAtCluster); | |
1517 | ||
1518 | // Re-calculate track parameters | |
1519 | // - from the cluster immediately downstream the one suppressed | |
1520 | // - or from the begining - if parameters have been re-computed using the standard method (kalman parameters have been lost) | |
ff078154 | 1521 | // - or if the removed cluster was used to compute the tracking seed |
4ea3f013 | 1522 | Bool_t normalExtrap; |
ff078154 | 1523 | if (smoothed && nextTrackParam) { |
1524 | ||
1525 | nextChamber = nextTrackParam->GetClusterPtr()->GetChamberId(); | |
1526 | next2nextTrackParam = nextTrackParam; | |
1527 | do { | |
1528 | ||
1529 | next2nextChamber = next2nextTrackParam->GetClusterPtr()->GetChamberId(); | |
1530 | next2nextTrackParam = (AliMUONTrackParam*) track.GetTrackParamAtCluster()->After(next2nextTrackParam); | |
1531 | ||
1532 | } while (next2nextTrackParam && (next2nextChamber == nextChamber)); | |
1533 | ||
4ea3f013 | 1534 | if (next2nextChamber == nextChamber) normalExtrap = RetraceTrack(track,kTRUE); |
1535 | else normalExtrap = RetracePartialTrack(track,nextTrackParam); | |
ff078154 | 1536 | |
4ea3f013 | 1537 | } else normalExtrap = RetraceTrack(track,kTRUE); |
1538 | ||
1539 | // stop in case of extrapolation problem | |
1540 | if (!normalExtrap) { | |
1541 | AliWarning("track partially improved but problem occur during refitting --> stop improvement"); | |
1542 | break; | |
1543 | } | |
7332f213 | 1544 | |
1545 | // Printout for debuging | |
1546 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
1547 | cout << "ImproveTracks: track " << fRecTracksPtr->IndexOf(&track)+1 << " improved " << endl; | |
ea94c18b | 1548 | } |
1549 | ||
ea94c18b | 1550 | } |
1551 | ||
8cc77df0 | 1552 | } |
1553 | ||
7332f213 | 1554 | //__________________________________________________________________________ |
4ea3f013 | 1555 | Bool_t AliMUONTrackReconstructorK::FinalizeTrack(AliMUONTrack &track) |
b0e4c598 | 1556 | { |
96ebe67e | 1557 | /// Update track parameters and covariances at each attached cluster |
7332f213 | 1558 | /// using smoother if required, if not already done |
4ea3f013 | 1559 | /// return kFALSE if the track cannot be extrapolated uo to the last chamber |
b709ac13 | 1560 | |
96ebe67e | 1561 | AliMUONTrackParam *trackParamAtCluster; |
ea94c18b | 1562 | Bool_t smoothed = kFALSE; |
1563 | ||
7332f213 | 1564 | // update track parameters (using smoother if required) if not already done |
4ea3f013 | 1565 | if (track.IsImproved()) smoothed = GetRecoParam()->UseSmoother(); |
1566 | else { | |
a0dc65b4 | 1567 | if (GetRecoParam()->UseSmoother()) smoothed = RunSmoother(track); |
d1e6fdee | 1568 | if (!smoothed) { |
4ea3f013 | 1569 | if (track.UpdateCovTrackParamAtCluster()) track.ComputeLocalChi2(kTRUE); |
1570 | else { | |
1571 | AliWarning("finalization failed due to extrapolation problem"); | |
1572 | return kFALSE; | |
1573 | } | |
d1e6fdee | 1574 | } |
4ea3f013 | 1575 | } |
7332f213 | 1576 | |
1577 | // copy smoothed parameters and covariances if any | |
1578 | if (smoothed) { | |
ea94c18b | 1579 | |
7332f213 | 1580 | trackParamAtCluster = (AliMUONTrackParam*) (track.GetTrackParamAtCluster()->First()); |
1581 | while (trackParamAtCluster) { | |
ea94c18b | 1582 | |
7332f213 | 1583 | trackParamAtCluster->SetParameters(trackParamAtCluster->GetSmoothParameters()); |
1584 | trackParamAtCluster->SetCovariances(trackParamAtCluster->GetSmoothCovariances()); | |
ea94c18b | 1585 | |
7332f213 | 1586 | trackParamAtCluster = (AliMUONTrackParam*) (track.GetTrackParamAtCluster()->After(trackParamAtCluster)); |
ea94c18b | 1587 | } |
1588 | ||
b0e4c598 | 1589 | } |
7332f213 | 1590 | |
4ea3f013 | 1591 | return kTRUE; |
1592 | ||
7deb8eb0 | 1593 | } |
1594 | ||
1595 | //__________________________________________________________________________ | |
b1fea02e | 1596 | Bool_t AliMUONTrackReconstructorK::RefitTrack(AliMUONTrack &track, Bool_t enableImprovement) |
7deb8eb0 | 1597 | { |
1598 | /// re-fit the given track | |
89c8d66d | 1599 | AliDebug(1,"Enter RefitTrack"); |
7deb8eb0 | 1600 | |
ff078154 | 1601 | // check validity of the track (i.e. at least 2 chambers hit on stations 4 and 5) |
1602 | if (!track.IsValid(0)) { | |
1603 | AliWarning("the track is not valid --> unable to refit"); | |
7deb8eb0 | 1604 | return kFALSE; |
1605 | } | |
1606 | ||
1607 | // re-compute track parameters and covariances using Kalman filter | |
4ea3f013 | 1608 | if (!RetraceTrack(track,kTRUE)) { |
1609 | AliWarning("bad track refitting due to extrapolation failure"); | |
1610 | return kFALSE; | |
1611 | } | |
7deb8eb0 | 1612 | |
1613 | // Improve the reconstructed tracks if required | |
b1fea02e | 1614 | track.SetImproved(kFALSE); |
a0dc65b4 | 1615 | if (enableImprovement && GetRecoParam()->ImproveTracks()) ImproveTrack(track); |
7deb8eb0 | 1616 | |
1617 | // Fill AliMUONTrack data members | |
4ea3f013 | 1618 | if (track.GetGlobalChi2() < AliMUONTrack::MaxChi2()) return FinalizeTrack(track); |
1619 | else { | |
1620 | AliWarning("track not finalized due to extrapolation failure"); | |
1621 | return kFALSE; | |
1622 | } | |
7deb8eb0 | 1623 | |
b0e4c598 | 1624 | } |
ea94c18b | 1625 |