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a9e2aefa | 1 | /************************************************************************** |
2 | * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. * | |
3 | * * | |
4 | * Author: The ALICE Off-line Project. * | |
5 | * Contributors are mentioned in the code where appropriate. * | |
6 | * * | |
7 | * Permission to use, copy, modify and distribute this software and its * | |
8 | * documentation strictly for non-commercial purposes is hereby granted * | |
9 | * without fee, provided that the above copyright notice appears in all * | |
10 | * copies and that both the copyright notice and this permission notice * | |
11 | * appear in the supporting documentation. The authors make no claims * | |
12 | * about the suitability of this software for any purpose. It is * | |
13 | * provided "as is" without express or implied warranty. * | |
14 | **************************************************************************/ | |
15 | ||
cc87ebcd | 16 | /* $Id$ */ |
17 | ||
3d1463c8 | 18 | //----------------------------------------------------------------------------- |
7945aae7 | 19 | /// \class AliMUONTrackReconstructor |
20 | /// MUON track reconstructor using the original method | |
21 | /// | |
22 | /// This class contains as data: | |
23 | /// - the parameters for the track reconstruction | |
24 | /// | |
25 | /// It contains as methods, among others: | |
26 | /// - MakeTracks to build the tracks | |
3d1463c8 | 27 | //----------------------------------------------------------------------------- |
a9e2aefa | 28 | |
29f1b13a | 29 | #include "AliMUONTrackReconstructor.h" |
7ec3b9cf | 30 | |
29fc2c86 | 31 | #include "AliMUONConstants.h" |
2457f726 | 32 | #include "AliMUONHitForRec.h" |
a9e2aefa | 33 | #include "AliMUONTrack.h" |
37827b29 | 34 | #include "AliMUONTrackParam.h" |
35 | #include "AliMUONTrackExtrap.h" | |
b709ac13 | 36 | |
8c343c7c | 37 | #include "AliLog.h" |
af743f54 | 38 | |
208f139e | 39 | #include <TMinuit.h> |
af743f54 | 40 | #include <Riostream.h> |
ea94c18b | 41 | #include <TMath.h> |
af743f54 | 42 | #include <TMatrixD.h> |
a9e2aefa | 43 | |
de2cd600 | 44 | // Functions to be minimized with Minuit |
ea94c18b | 45 | void TrackChi2(Int_t &nParam, Double_t *gradient, Double_t &chi2, Double_t *param, Int_t flag); |
de2cd600 | 46 | |
7945aae7 | 47 | /// \cond CLASSIMP |
29f1b13a | 48 | ClassImp(AliMUONTrackReconstructor) // Class implementation in ROOT context |
7945aae7 | 49 | /// \endcond |
a9e2aefa | 50 | |
019df241 | 51 | //__________________________________________________________________________ |
7ec3b9cf | 52 | AliMUONTrackReconstructor::AliMUONTrackReconstructor() |
53 | : AliMUONVTrackReconstructor() | |
a9e2aefa | 54 | { |
2457f726 | 55 | /// Constructor for class AliMUONTrackReconstructor |
ea94c18b | 56 | AliInfo("*** Original tracking ***"); |
a9e2aefa | 57 | } |
9cbdf048 | 58 | |
019df241 | 59 | //__________________________________________________________________________ |
ea94c18b | 60 | AliMUONTrackReconstructor::~AliMUONTrackReconstructor() |
a9e2aefa | 61 | { |
ea94c18b | 62 | /// Destructor |
63 | } | |
276c44b7 | 64 | |
de2cd600 | 65 | //__________________________________________________________________________ |
ea94c18b | 66 | void AliMUONTrackReconstructor::MakeTrackCandidates() |
de2cd600 | 67 | { |
019df241 | 68 | /// To make track candidates (assuming linear propagation if the flag fgkMakeTrackCandidatesFast is set to kTRUE): |
208f139e | 69 | /// Start with segments station(1..) 4 or 5 then follow track in station 5 or 4. |
70 | /// Good candidates are made of at least three hitForRec's. | |
71 | /// Keep only best candidates or all of them according to the flag fgkTrackAllTracks. | |
b709ac13 | 72 | |
208f139e | 73 | TClonesArray *segments; |
208f139e | 74 | AliMUONTrack *track; |
208f139e | 75 | Int_t iCandidate = 0; |
019df241 | 76 | Bool_t hitFound; |
208f139e | 77 | |
de2cd600 | 78 | AliDebug(1,"Enter MakeTrackCandidates"); |
de2cd600 | 79 | |
208f139e | 80 | // Loop over stations(1..) 5 and 4 and make track candidates |
ea94c18b | 81 | for (Int_t istat=4; istat>=3; istat--) { |
82 | ||
208f139e | 83 | // Make segments in the station |
84 | segments = MakeSegmentsInStation(istat); | |
ea94c18b | 85 | |
208f139e | 86 | // Loop over segments |
7ec3b9cf | 87 | for (Int_t iseg=0; iseg<segments->GetEntriesFast(); iseg++) |
88 | { | |
208f139e | 89 | AliDebug(1,Form("Making primary candidate(1..) %d",++iCandidate)); |
ea94c18b | 90 | |
208f139e | 91 | // Transform segments to tracks and put them at the end of fRecTracksPtr |
ea94c18b | 92 | track = new ((*fRecTracksPtr)[fRecTracksPtr->GetLast()+1]) AliMUONTrack((AliMUONObjectPair*)((*segments)[iseg])); |
a9e2aefa | 93 | fNRecTracks++; |
ea94c18b | 94 | |
208f139e | 95 | // Printout for debuging |
7ec3b9cf | 96 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructor") >= 2) || (AliLog::GetGlobalDebugLevel() >= 2)) |
97 | { | |
208f139e | 98 | cout<<endl<<"Track parameter covariances at first hit with multiple Coulomb scattering effects:"<<endl; |
ea94c18b | 99 | ((AliMUONTrackParam*) track->GetTrackParamAtHit()->First())->GetCovariances().Print(); |
208f139e | 100 | } |
ea94c18b | 101 | |
208f139e | 102 | // Look for compatible hitForRec(s) in the other station |
3304fa09 | 103 | if (AliMUONReconstructor::GetRecoParam()->MakeTrackCandidatesFast()) hitFound = FollowLinearTrackInStation(*track,7-istat); |
019df241 | 104 | else hitFound = FollowTrackInStation(*track,7-istat); |
105 | ||
106 | // Remove track if no hit found | |
107 | if (!hitFound) { | |
ea94c18b | 108 | fRecTracksPtr->Remove(track); |
109 | fNRecTracks--; | |
110 | } | |
111 | ||
a9e2aefa | 112 | } |
ea94c18b | 113 | |
208f139e | 114 | // delete the array of segments |
115 | delete segments; | |
116 | } | |
ea94c18b | 117 | |
208f139e | 118 | fRecTracksPtr->Compress(); // this is essential before checking tracks |
119 | ||
120 | // Keep all different tracks or only the best ones as required | |
3304fa09 | 121 | if (AliMUONReconstructor::GetRecoParam()->TrackAllTracks()) RemoveIdenticalTracks(); |
208f139e | 122 | else RemoveDoubleTracks(); |
123 | ||
124 | AliDebug(1,Form("Number of good candidates = %d",fNRecTracks)); | |
125 | ||
a9e2aefa | 126 | } |
127 | ||
128 | //__________________________________________________________________________ | |
ea94c18b | 129 | void AliMUONTrackReconstructor::FollowTracks() |
a9e2aefa | 130 | { |
2457f726 | 131 | /// Follow tracks in stations(1..) 3, 2 and 1 |
208f139e | 132 | AliDebug(1,"Enter FollowTracks"); |
133 | ||
04b5ea16 | 134 | AliMUONTrack *track, *nextTrack; |
b709ac13 | 135 | AliMUONTrackParam *trackParam, *nextTrackParam; |
af743f54 | 136 | Int_t currentNRecTracks; |
ea94c18b | 137 | Bool_t hitFound; |
208f139e | 138 | |
3304fa09 | 139 | Double_t sigmaCut2 = AliMUONReconstructor::GetRecoParam()->GetSigmaCutForTracking() * |
140 | AliMUONReconstructor::GetRecoParam()->GetSigmaCutForTracking(); | |
141 | ||
208f139e | 142 | for (Int_t station = 2; station >= 0; station--) { |
ea94c18b | 143 | |
208f139e | 144 | // Save the actual number of reconstructed track in case of |
145 | // tracks are added or suppressed during the tracking procedure | |
146 | // !! Do not compress fRecTracksPtr until the end of the loop over tracks !! | |
af743f54 | 147 | currentNRecTracks = fNRecTracks; |
ea94c18b | 148 | |
af743f54 | 149 | for (Int_t iRecTrack = 0; iRecTrack <currentNRecTracks; iRecTrack++) { |
208f139e | 150 | AliDebug(1,Form("FollowTracks: track candidate(1..) %d", iRecTrack+1)); |
ea94c18b | 151 | |
208f139e | 152 | track = (AliMUONTrack*) fRecTracksPtr->UncheckedAt(iRecTrack); |
ea94c18b | 153 | |
208f139e | 154 | // Fit the track: |
155 | // Do not take into account the multiple scattering to speed up the fit | |
156 | // Calculate the track parameter covariance matrix | |
157 | // If "station" is station(1..) 3 then use the vertex to better constrain the fit | |
158 | if (station==2) { | |
ea94c18b | 159 | SetVertexForFit(*track); |
208f139e | 160 | track->SetFitWithVertex(kTRUE); |
161 | } else track->SetFitWithVertex(kFALSE); | |
ea94c18b | 162 | Fit(*track, kFALSE, kTRUE); |
163 | ||
208f139e | 164 | // Remove the track if the normalized chi2 is too high |
3304fa09 | 165 | if (track->GetNormalizedChi2() > sigmaCut2) { |
208f139e | 166 | fRecTracksPtr->Remove(track); |
167 | fNRecTracks--; | |
168 | continue; | |
169 | } | |
ea94c18b | 170 | |
b709ac13 | 171 | // save parameters from fit into smoothed parameters to complete track afterward |
3304fa09 | 172 | if (AliMUONReconstructor::GetRecoParam()->ComplementTracks()) { |
b709ac13 | 173 | |
174 | if (station==2) { // save track parameters on stations 4 and 5 | |
175 | ||
176 | // extrapolate track parameters and covariances at each cluster | |
177 | track->UpdateCovTrackParamAtHit(); | |
178 | ||
179 | // save them | |
180 | trackParam = (AliMUONTrackParam*) track->GetTrackParamAtHit()->First(); | |
181 | while (trackParam) { | |
182 | trackParam->SetSmoothParameters(trackParam->GetParameters()); | |
183 | trackParam->SetSmoothCovariances(trackParam->GetCovariances()); | |
184 | trackParam = (AliMUONTrackParam*) track->GetTrackParamAtHit()->After(trackParam); | |
185 | } | |
186 | ||
187 | } else { // or save track parameters on last station only | |
188 | ||
189 | // save parameters from fit | |
190 | trackParam = (AliMUONTrackParam*) track->GetTrackParamAtHit()->First(); | |
191 | trackParam->SetSmoothParameters(trackParam->GetParameters()); | |
192 | trackParam->SetSmoothCovariances(trackParam->GetCovariances()); | |
193 | ||
194 | // save parameters extrapolated to the second chamber of the same station if it has been hit | |
195 | nextTrackParam = (AliMUONTrackParam*) track->GetTrackParamAtHit()->After(trackParam); | |
196 | if (nextTrackParam->GetHitForRecPtr()->GetChamberNumber() < 2*(station+2)) { | |
197 | ||
198 | // reset parameters and covariances | |
199 | nextTrackParam->SetParameters(trackParam->GetParameters()); | |
200 | nextTrackParam->SetZ(trackParam->GetZ()); | |
201 | nextTrackParam->SetCovariances(trackParam->GetCovariances()); | |
202 | ||
203 | // extrapolate them to the z of the corresponding cluster | |
204 | AliMUONTrackExtrap::ExtrapToZCov(nextTrackParam, nextTrackParam->GetHitForRecPtr()->GetZ()); | |
205 | ||
206 | // save them | |
207 | nextTrackParam->SetSmoothParameters(nextTrackParam->GetParameters()); | |
208 | nextTrackParam->SetSmoothCovariances(nextTrackParam->GetCovariances()); | |
209 | ||
210 | } | |
211 | ||
212 | } | |
213 | ||
214 | } | |
215 | ||
208f139e | 216 | // Printout for debuging |
217 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructor") >= 2) || (AliLog::GetGlobalDebugLevel() >= 2)) { | |
218 | cout<<endl<<"Track parameter covariances at first hit with multiple Coulomb scattering effects:"<<endl; | |
ea94c18b | 219 | ((AliMUONTrackParam*) track->GetTrackParamAtHit()->First())->GetCovariances().Print(); |
208f139e | 220 | } |
ea94c18b | 221 | |
208f139e | 222 | // Look for compatible hitForRec in station(0..) "station" |
ea94c18b | 223 | hitFound = FollowTrackInStation(*track,station); |
224 | ||
225 | // Try to recover track if required | |
3304fa09 | 226 | if (!hitFound && AliMUONReconstructor::GetRecoParam()->RecoverTracks()) hitFound = RecoverTrack(*track,station); |
ea94c18b | 227 | |
228 | // remove track if no hit found | |
229 | if (!hitFound) { | |
230 | fRecTracksPtr->Remove(track); | |
231 | fNRecTracks--; | |
232 | } | |
233 | ||
208f139e | 234 | } |
ea94c18b | 235 | |
208f139e | 236 | // Compress fRecTracksPtr for the next step |
237 | fRecTracksPtr->Compress(); | |
ea94c18b | 238 | |
208f139e | 239 | // Keep only the best tracks if required |
3304fa09 | 240 | if (!AliMUONReconstructor::GetRecoParam()->TrackAllTracks()) RemoveDoubleTracks(); |
ea94c18b | 241 | |
208f139e | 242 | } |
243 | ||
244 | // Last fit of track candidates with all station | |
245 | // Take into account the multiple scattering and remove bad tracks | |
246 | Int_t trackIndex = -1; | |
04b5ea16 | 247 | track = (AliMUONTrack*) fRecTracksPtr->First(); |
04b5ea16 | 248 | while (track) { |
ea94c18b | 249 | |
04b5ea16 | 250 | trackIndex++; |
251 | nextTrack = (AliMUONTrack*) fRecTracksPtr->After(track); // prepare next track | |
ea94c18b | 252 | |
208f139e | 253 | track->SetFitWithVertex(kFALSE); // just to be sure |
ea94c18b | 254 | Fit(*track, kTRUE, kTRUE); |
255 | ||
208f139e | 256 | // Printout for debuging |
257 | if (AliLog::GetGlobalDebugLevel() >= 3) { | |
258 | cout << "FollowTracks: track candidate(0..) " << trackIndex << " after final fit" << endl; | |
a9e2aefa | 259 | track->RecursiveDump(); |
208f139e | 260 | } |
ea94c18b | 261 | |
208f139e | 262 | // Remove the track if the normalized chi2 is too high |
3304fa09 | 263 | if (track->GetNormalizedChi2() > sigmaCut2) { |
208f139e | 264 | fRecTracksPtr->Remove(track); |
265 | fNRecTracks--; | |
a9e2aefa | 266 | } |
ea94c18b | 267 | |
b709ac13 | 268 | // save parameters from fit into smoothed parameters to complete track afterward |
3304fa09 | 269 | if (AliMUONReconstructor::GetRecoParam()->ComplementTracks()) { |
b709ac13 | 270 | |
271 | // save parameters from fit | |
272 | trackParam = (AliMUONTrackParam*) track->GetTrackParamAtHit()->First(); | |
273 | trackParam->SetSmoothParameters(trackParam->GetParameters()); | |
274 | trackParam->SetSmoothCovariances(trackParam->GetCovariances()); | |
275 | ||
276 | // save parameters extrapolated to the second chamber of the same station if it has been hit | |
277 | nextTrackParam = (AliMUONTrackParam*) track->GetTrackParamAtHit()->After(trackParam); | |
278 | if (nextTrackParam->GetHitForRecPtr()->GetChamberNumber() < 2) { | |
279 | ||
280 | // reset parameters and covariances | |
281 | nextTrackParam->SetParameters(trackParam->GetParameters()); | |
282 | nextTrackParam->SetZ(trackParam->GetZ()); | |
283 | nextTrackParam->SetCovariances(trackParam->GetCovariances()); | |
284 | ||
285 | // extrapolate them to the z of the corresponding cluster | |
286 | AliMUONTrackExtrap::ExtrapToZCov(nextTrackParam, nextTrackParam->GetHitForRecPtr()->GetZ()); | |
287 | ||
288 | // save them | |
289 | nextTrackParam->SetSmoothParameters(nextTrackParam->GetParameters()); | |
290 | nextTrackParam->SetSmoothCovariances(nextTrackParam->GetCovariances()); | |
291 | ||
292 | } | |
293 | ||
294 | } | |
295 | ||
208f139e | 296 | track = nextTrack; |
ea94c18b | 297 | |
208f139e | 298 | } |
ea94c18b | 299 | |
208f139e | 300 | fRecTracksPtr->Compress(); |
301 | ||
302 | } | |
1a38e749 | 303 | |
208f139e | 304 | //__________________________________________________________________________ |
ea94c18b | 305 | Bool_t AliMUONTrackReconstructor::FollowTrackInStation(AliMUONTrack &trackCandidate, Int_t nextStation) |
208f139e | 306 | { |
307 | /// Follow trackCandidate in station(0..) nextStation and search for compatible HitForRec(s) | |
308 | /// Keep all possibilities or only the best one(s) according to the flag fgkTrackAllTracks: | |
309 | /// kTRUE: duplicate "trackCandidate" if there are several possibilities and add the new tracks at the end of | |
310 | /// fRecTracksPtr to avoid conficts with other track candidates at this current stage of the tracking procedure. | |
311 | /// Remove the obsolete "trackCandidate" at the end. | |
312 | /// kFALSE: add only the best hit(s) to the "trackCandidate". Try to add a couple of hits in priority. | |
313 | AliDebug(1,Form("Enter FollowTrackInStation(1..) %d", nextStation+1)); | |
314 | ||
ea94c18b | 315 | // Order the chamber according to the propagation direction (tracking starts with chamber 2): |
316 | // - nextStation == station(1...) 5 => forward propagation | |
317 | // - nextStation < station(1...) 5 => backward propagation | |
318 | Int_t ch1, ch2; | |
319 | if (nextStation==4) { | |
320 | ch1 = 2*nextStation+1; | |
321 | ch2 = 2*nextStation; | |
322 | } else { | |
323 | ch1 = 2*nextStation; | |
324 | ch2 = 2*nextStation+1; | |
325 | } | |
326 | ||
208f139e | 327 | Double_t chi2WithOneHitForRec = 1.e10; |
328 | Double_t chi2WithTwoHitForRec = 1.e10; | |
3304fa09 | 329 | Double_t maxChi2WithOneHitForRec = 2. * AliMUONReconstructor::GetRecoParam()->GetSigmaCutForTracking() * |
330 | AliMUONReconstructor::GetRecoParam()->GetSigmaCutForTracking(); // 2 because 2 quantities in chi2 | |
331 | Double_t maxChi2WithTwoHitForRec = 4. * AliMUONReconstructor::GetRecoParam()->GetSigmaCutForTracking() * | |
332 | AliMUONReconstructor::GetRecoParam()->GetSigmaCutForTracking(); // 4 because 4 quantities in chi2 | |
208f139e | 333 | Double_t bestChi2WithOneHitForRec = maxChi2WithOneHitForRec; |
334 | Double_t bestChi2WithTwoHitForRec = maxChi2WithTwoHitForRec; | |
ea94c18b | 335 | Bool_t foundOneHit = kFALSE; |
336 | Bool_t foundTwoHits = kFALSE; | |
208f139e | 337 | AliMUONTrack *newTrack = 0x0; |
338 | AliMUONHitForRec *hitForRecCh1, *hitForRecCh2; | |
019df241 | 339 | AliMUONTrackParam extrapTrackParam; |
ea94c18b | 340 | AliMUONTrackParam extrapTrackParamAtHit1; |
341 | AliMUONTrackParam extrapTrackParamAtHit2; | |
342 | AliMUONTrackParam bestTrackParamAtHit1; | |
343 | AliMUONTrackParam bestTrackParamAtHit2; | |
847cbaef | 344 | Bool_t *hitForRecCh1Used = new Bool_t[fNHitsForRecPerChamber[ch1]]; |
345 | for (Int_t hit1 = 0; hit1 < fNHitsForRecPerChamber[ch1]; hit1++) hitForRecCh1Used[hit1] = kFALSE; | |
ea94c18b | 346 | |
019df241 | 347 | // Get track parameters |
348 | AliMUONTrackParam extrapTrackParamAtCh(*(AliMUONTrackParam*)trackCandidate.GetTrackParamAtHit()->First()); | |
ea94c18b | 349 | |
350 | // Add MCS effect | |
019df241 | 351 | AliMUONTrackExtrap::AddMCSEffect(&extrapTrackParamAtCh,AliMUONConstants::ChamberThicknessInX0(),1.); |
ea94c18b | 352 | |
353 | // Add MCS in the missing chamber if any (only 1 chamber can be missing according to tracking criteria) | |
019df241 | 354 | if (ch1 < ch2 && extrapTrackParamAtCh.GetHitForRecPtr()->GetChamberNumber() > ch2 + 1) { |
ea94c18b | 355 | // extrapolation to the missing chamber |
019df241 | 356 | AliMUONTrackExtrap::ExtrapToZCov(&extrapTrackParamAtCh, AliMUONConstants::DefaultChamberZ(ch2 + 1)); |
ea94c18b | 357 | // add MCS effect |
019df241 | 358 | AliMUONTrackExtrap::AddMCSEffect(&extrapTrackParamAtCh,AliMUONConstants::ChamberThicknessInX0(),1.); |
ea94c18b | 359 | } |
360 | ||
361 | //Extrapolate trackCandidate to chamber "ch2" | |
019df241 | 362 | AliMUONTrackExtrap::ExtrapToZCov(&extrapTrackParamAtCh, AliMUONConstants::DefaultChamberZ(ch2)); |
ea94c18b | 363 | |
208f139e | 364 | // Printout for debuging |
365 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructor") >= 2) || (AliLog::GetGlobalDebugLevel() >= 2)) { | |
019df241 | 366 | cout<<endl<<"Track parameter covariances at first hit extrapolated to z = "<<AliMUONConstants::DefaultChamberZ(ch2)<<":"<<endl; |
367 | extrapTrackParamAtCh.GetCovariances().Print(); | |
208f139e | 368 | } |
ea94c18b | 369 | |
208f139e | 370 | // Printout for debuging |
371 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
372 | cout << "FollowTrackInStation: look for hits in chamber(1..): " << ch2+1 << endl; | |
373 | } | |
ea94c18b | 374 | |
375 | // look for candidates in chamber 2 | |
208f139e | 376 | for (Int_t hit2 = 0; hit2 < fNHitsForRecPerChamber[ch2]; hit2++) { |
ea94c18b | 377 | |
208f139e | 378 | hitForRecCh2 = (AliMUONHitForRec*) fHitsForRecPtr->UncheckedAt(fIndexOfFirstHitForRecPerChamber[ch2]+hit2); |
ea94c18b | 379 | |
019df241 | 380 | // try to add the current hit fast |
381 | if (!TryOneHitForRecFast(extrapTrackParamAtCh, hitForRecCh2)) continue; | |
382 | ||
383 | // try to add the current hit accuratly | |
384 | chi2WithOneHitForRec = TryOneHitForRec(extrapTrackParamAtCh, hitForRecCh2, extrapTrackParamAtHit2); | |
ea94c18b | 385 | |
208f139e | 386 | // if good chi2 then try to attach a hitForRec in the other chamber too |
387 | if (chi2WithOneHitForRec < maxChi2WithOneHitForRec) { | |
ea94c18b | 388 | Bool_t foundSecondHit = kFALSE; |
389 | ||
208f139e | 390 | // Printout for debuging |
391 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
ea94c18b | 392 | cout << "FollowTrackInStation: found one hit in chamber(1..): " << ch2+1 |
393 | << " (Chi2 = " << chi2WithOneHitForRec << ")" << endl; | |
394 | cout << " look for second hits in chamber(1..): " << ch1+1 << " ..." << endl; | |
a9e2aefa | 395 | } |
ea94c18b | 396 | |
397 | // add MCS effect for next step | |
398 | AliMUONTrackExtrap::AddMCSEffect(&extrapTrackParamAtHit2,AliMUONConstants::ChamberThicknessInX0(),1.); | |
399 | ||
019df241 | 400 | // copy new track parameters for next step |
401 | extrapTrackParam = extrapTrackParamAtHit2; | |
402 | ||
403 | //Extrapolate track parameters to chamber "ch1" | |
404 | AliMUONTrackExtrap::ExtrapToZ(&extrapTrackParam, AliMUONConstants::DefaultChamberZ(ch1)); | |
405 | ||
208f139e | 406 | for (Int_t hit1 = 0; hit1 < fNHitsForRecPerChamber[ch1]; hit1++) { |
ea94c18b | 407 | |
408 | hitForRecCh1 = (AliMUONHitForRec*) fHitsForRecPtr->UncheckedAt(fIndexOfFirstHitForRecPerChamber[ch1]+hit1); | |
409 | ||
019df241 | 410 | // try to add the current hit fast |
411 | if (!TryOneHitForRecFast(extrapTrackParam, hitForRecCh1)) continue; | |
412 | ||
413 | // try to add the current hit accuratly | |
ea94c18b | 414 | chi2WithTwoHitForRec = TryTwoHitForRec(extrapTrackParamAtHit2, hitForRecCh1, extrapTrackParamAtHit1); |
415 | ||
416 | // if good chi2 then create a new track by adding the 2 hitForRec to the "trackCandidate" | |
208f139e | 417 | if (chi2WithTwoHitForRec < maxChi2WithTwoHitForRec) { |
418 | foundSecondHit = kTRUE; | |
ea94c18b | 419 | foundTwoHits = kTRUE; |
420 | ||
421 | // Printout for debuging | |
422 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
423 | cout << "FollowTrackInStation: found second hit in chamber(1..): " << ch1+1 | |
424 | << " (Global Chi2 = " << chi2WithTwoHitForRec << ")" << endl; | |
425 | } | |
426 | ||
3304fa09 | 427 | if (AliMUONReconstructor::GetRecoParam()->TrackAllTracks()) { |
208f139e | 428 | // copy trackCandidate into a new track put at the end of fRecTracksPtr and add the new hitForRec's |
ea94c18b | 429 | newTrack = new ((*fRecTracksPtr)[fRecTracksPtr->GetLast()+1]) AliMUONTrack(trackCandidate); |
430 | UpdateTrack(*newTrack,extrapTrackParamAtHit1,extrapTrackParamAtHit2); | |
208f139e | 431 | fNRecTracks++; |
ea94c18b | 432 | |
847cbaef | 433 | // Tag hitForRecCh1 as used |
434 | hitForRecCh1Used[hit1] = kTRUE; | |
ea94c18b | 435 | |
208f139e | 436 | // Printout for debuging |
437 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
ea94c18b | 438 | cout << "FollowTrackInStation: added two hits in station(1..): " << nextStation+1 << endl; |
208f139e | 439 | if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump(); |
a9e2aefa | 440 | } |
ea94c18b | 441 | |
208f139e | 442 | } else if (chi2WithTwoHitForRec < bestChi2WithTwoHitForRec) { |
443 | // keep track of the best couple of hits | |
444 | bestChi2WithTwoHitForRec = chi2WithTwoHitForRec; | |
ea94c18b | 445 | bestTrackParamAtHit1 = extrapTrackParamAtHit1; |
446 | bestTrackParamAtHit2 = extrapTrackParamAtHit2; | |
208f139e | 447 | } |
ea94c18b | 448 | |
a9e2aefa | 449 | } |
ea94c18b | 450 | |
d0bfce8d | 451 | } |
ea94c18b | 452 | |
208f139e | 453 | // if no hitForRecCh1 found then consider to add hitForRecCh2 only |
454 | if (!foundSecondHit) { | |
ea94c18b | 455 | foundOneHit = kTRUE; |
456 | ||
3304fa09 | 457 | if (AliMUONReconstructor::GetRecoParam()->TrackAllTracks()) { |
208f139e | 458 | // copy trackCandidate into a new track put at the end of fRecTracksPtr and add the new hitForRec's |
ea94c18b | 459 | newTrack = new ((*fRecTracksPtr)[fRecTracksPtr->GetLast()+1]) AliMUONTrack(trackCandidate); |
460 | UpdateTrack(*newTrack,extrapTrackParamAtHit2); | |
208f139e | 461 | fNRecTracks++; |
ea94c18b | 462 | |
208f139e | 463 | // Printout for debuging |
464 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
ea94c18b | 465 | cout << "FollowTrackInStation: added one hit in chamber(1..): " << ch2+1 << endl; |
208f139e | 466 | if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump(); |
467 | } | |
ea94c18b | 468 | |
469 | } else if (!foundTwoHits && chi2WithOneHitForRec < bestChi2WithOneHitForRec) { | |
019df241 | 470 | // keep track of the best single hitForRec except if a couple of hits has already been found |
208f139e | 471 | bestChi2WithOneHitForRec = chi2WithOneHitForRec; |
ea94c18b | 472 | bestTrackParamAtHit1 = extrapTrackParamAtHit2; |
208f139e | 473 | } |
ea94c18b | 474 | |
d0bfce8d | 475 | } |
ea94c18b | 476 | |
208f139e | 477 | } |
ea94c18b | 478 | |
208f139e | 479 | } |
ea94c18b | 480 | |
208f139e | 481 | // look for candidates in chamber 1 not already attached to a track |
482 | // if we want to keep all possible tracks or if no good couple of hitForRec has been found | |
3304fa09 | 483 | if (AliMUONReconstructor::GetRecoParam()->TrackAllTracks() || !foundTwoHits) { |
ea94c18b | 484 | |
485 | // Printout for debuging | |
208f139e | 486 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { |
487 | cout << "FollowTrackInStation: look for single hits in chamber(1..): " << ch1+1 << endl; | |
488 | } | |
ea94c18b | 489 | |
490 | // add MCS effect for next step | |
019df241 | 491 | AliMUONTrackExtrap::AddMCSEffect(&extrapTrackParamAtCh,AliMUONConstants::ChamberThicknessInX0(),1.); |
492 | ||
493 | //Extrapolate trackCandidate to chamber "ch1" | |
494 | AliMUONTrackExtrap::ExtrapToZCov(&extrapTrackParamAtCh, AliMUONConstants::DefaultChamberZ(ch1)); | |
495 | ||
208f139e | 496 | for (Int_t hit1 = 0; hit1 < fNHitsForRecPerChamber[ch1]; hit1++) { |
ea94c18b | 497 | |
208f139e | 498 | hitForRecCh1 = (AliMUONHitForRec*) fHitsForRecPtr->UncheckedAt(fIndexOfFirstHitForRecPerChamber[ch1]+hit1); |
ea94c18b | 499 | |
847cbaef | 500 | if (hitForRecCh1Used[hit1]) continue; // Skip hitForRec already used |
ea94c18b | 501 | |
019df241 | 502 | // try to add the current hit fast |
503 | if (!TryOneHitForRecFast(extrapTrackParamAtCh, hitForRecCh1)) continue; | |
504 | ||
505 | // try to add the current hit accuratly | |
506 | chi2WithOneHitForRec = TryOneHitForRec(extrapTrackParamAtCh, hitForRecCh1, extrapTrackParamAtHit1); | |
ea94c18b | 507 | |
508 | // if good chi2 then consider to add hitForRecCh1 | |
208f139e | 509 | // We do not try to attach a hitForRec in the other chamber too since it has already been done above |
510 | if (chi2WithOneHitForRec < maxChi2WithOneHitForRec) { | |
ea94c18b | 511 | foundOneHit = kTRUE; |
512 | ||
513 | // Printout for debuging | |
514 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
515 | cout << "FollowTrackInStation: found one hit in chamber(1..): " << ch1+1 | |
516 | << " (Chi2 = " << chi2WithOneHitForRec << ")" << endl; | |
517 | } | |
518 | ||
3304fa09 | 519 | if (AliMUONReconstructor::GetRecoParam()->TrackAllTracks()) { |
208f139e | 520 | // copy trackCandidate into a new track put at the end of fRecTracksPtr and add the new hitForRec's |
ea94c18b | 521 | newTrack = new ((*fRecTracksPtr)[fRecTracksPtr->GetLast()+1]) AliMUONTrack(trackCandidate); |
522 | UpdateTrack(*newTrack,extrapTrackParamAtHit1); | |
208f139e | 523 | fNRecTracks++; |
ea94c18b | 524 | |
525 | // Printout for debuging | |
208f139e | 526 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { |
ea94c18b | 527 | cout << "FollowTrackInStation: added one hit in chamber(1..): " << ch1+1 << endl; |
208f139e | 528 | if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump(); |
529 | } | |
ea94c18b | 530 | |
531 | } else if (chi2WithOneHitForRec < bestChi2WithOneHitForRec) { | |
019df241 | 532 | // keep track of the best single hitForRec except if a couple of hits has already been found |
208f139e | 533 | bestChi2WithOneHitForRec = chi2WithOneHitForRec; |
ea94c18b | 534 | bestTrackParamAtHit1 = extrapTrackParamAtHit1; |
208f139e | 535 | } |
ea94c18b | 536 | |
d0bfce8d | 537 | } |
ea94c18b | 538 | |
208f139e | 539 | } |
ea94c18b | 540 | |
208f139e | 541 | } |
ea94c18b | 542 | |
208f139e | 543 | // fill out the best track if required else clean up the fRecTracksPtr array |
3304fa09 | 544 | if (!AliMUONReconstructor::GetRecoParam()->TrackAllTracks()) { |
ea94c18b | 545 | if (foundTwoHits) { |
546 | UpdateTrack(trackCandidate,bestTrackParamAtHit1,bestTrackParamAtHit2); | |
547 | ||
208f139e | 548 | // Printout for debuging |
549 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
ea94c18b | 550 | cout << "FollowTrackInStation: added the two best hits in station(1..): " << nextStation+1 << endl; |
208f139e | 551 | if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump(); |
a9e2aefa | 552 | } |
ea94c18b | 553 | |
554 | } else if (foundOneHit) { | |
555 | UpdateTrack(trackCandidate,bestTrackParamAtHit1); | |
556 | ||
208f139e | 557 | // Printout for debuging |
558 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
ea94c18b | 559 | cout << "FollowTrackInStation: added the best hit in chamber(1..): " << bestTrackParamAtHit1.GetHitForRecPtr()->GetChamberNumber()+1 << endl; |
208f139e | 560 | if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump(); |
04b5ea16 | 561 | } |
ea94c18b | 562 | |
dd230855 | 563 | } else { |
564 | delete [] hitForRecCh1Used; | |
565 | return kFALSE; | |
566 | } | |
ea94c18b | 567 | |
568 | } else if (foundOneHit || foundTwoHits) { | |
569 | ||
570 | // remove obsolete track | |
571 | fRecTracksPtr->Remove(&trackCandidate); | |
572 | fNRecTracks--; | |
573 | ||
dd230855 | 574 | } else { |
575 | delete [] hitForRecCh1Used; | |
576 | return kFALSE; | |
577 | } | |
ea94c18b | 578 | |
dd230855 | 579 | delete [] hitForRecCh1Used; |
ea94c18b | 580 | return kTRUE; |
581 | ||
582 | } | |
583 | ||
584 | //__________________________________________________________________________ | |
019df241 | 585 | Double_t AliMUONTrackReconstructor::TryTwoHitForRec(const AliMUONTrackParam &trackParamAtHit1, AliMUONHitForRec* hitForRec2, |
586 | AliMUONTrackParam &trackParamAtHit2) | |
ea94c18b | 587 | { |
588 | /// Test the compatibility between the track and the 2 hitForRec together (using trackParam's covariance matrix): | |
589 | /// return the corresponding Chi2 accounting for covariances between the 2 hitForRec | |
590 | /// return trackParamAtHit1 & 2 | |
591 | ||
ea94c18b | 592 | // extrapolate track parameters at the z position of the second hit |
593 | trackParamAtHit2.SetParameters(trackParamAtHit1.GetParameters()); | |
594 | trackParamAtHit2.SetZ(trackParamAtHit1.GetZ()); | |
595 | AliMUONTrackExtrap::ExtrapToZ(&trackParamAtHit2, hitForRec2->GetZ()); | |
596 | ||
597 | // set pointer to hit2 into trackParamAtHit2 | |
598 | trackParamAtHit2.SetHitForRecPtr(hitForRec2); | |
599 | ||
600 | // Set differences between track and the 2 hitForRec in the bending and non bending directions | |
019df241 | 601 | AliMUONHitForRec* hitForRec1 = trackParamAtHit1.GetHitForRecPtr(); |
ea94c18b | 602 | TMatrixD dPos(4,1); |
603 | dPos(0,0) = hitForRec1->GetNonBendingCoor() - trackParamAtHit1.GetNonBendingCoor(); | |
604 | dPos(1,0) = hitForRec1->GetBendingCoor() - trackParamAtHit1.GetBendingCoor(); | |
605 | dPos(2,0) = hitForRec2->GetNonBendingCoor() - trackParamAtHit2.GetNonBendingCoor(); | |
606 | dPos(3,0) = hitForRec2->GetBendingCoor() - trackParamAtHit2.GetBendingCoor(); | |
607 | ||
ea94c18b | 608 | // Calculate the error matrix from the track parameter covariances at first hitForRec |
609 | TMatrixD error(4,4); | |
610 | error.Zero(); | |
611 | if (trackParamAtHit1.CovariancesExist()) { | |
612 | // Save track parameters at first hitForRec | |
613 | AliMUONTrackParam trackParamAtHit1Save(trackParamAtHit1); | |
614 | TMatrixD paramAtHit1Save(trackParamAtHit1Save.GetParameters()); | |
615 | Double_t z1 = trackParamAtHit1Save.GetZ(); | |
616 | ||
617 | // Save track coordinates at second hitForRec | |
618 | Double_t nonBendingCoor2 = trackParamAtHit2.GetNonBendingCoor(); | |
619 | Double_t bendingCoor2 = trackParamAtHit2.GetBendingCoor(); | |
620 | ||
621 | // add MCS effect at first hitForRec | |
622 | AliMUONTrackExtrap::AddMCSEffect(&trackParamAtHit1Save,AliMUONConstants::ChamberThicknessInX0(),1.); | |
623 | ||
624 | // Get the pointer to the parameter covariance matrix at first hitForRec | |
625 | const TMatrixD& kParamCov = trackParamAtHit1Save.GetCovariances(); | |
626 | ||
627 | // Calculate the jacobian related to the transformation between track parameters | |
628 | // at first hitForRec and track coordinates at the 2 hitForRec z-position | |
629 | TMatrixD jacob(4,5); | |
630 | jacob.Zero(); | |
631 | // first derivative at the first hitForRec: | |
632 | jacob(0,0) = 1.; // dx1/dx | |
633 | jacob(1,2) = 1.; // dy1/dy | |
634 | // first derivative at the second hitForRec: | |
635 | TMatrixD dParam(5,1); | |
636 | for (Int_t i=0; i<5; i++) { | |
637 | // Skip jacobian calculation for parameters with no associated error | |
638 | if (kParamCov(i,i) == 0.) continue; | |
639 | // Small variation of parameter i only | |
640 | for (Int_t j=0; j<5; j++) { | |
641 | if (j==i) { | |
642 | dParam(j,0) = TMath::Sqrt(kParamCov(i,i)); | |
643 | if (j == 4) dParam(j,0) *= TMath::Sign(1.,-paramAtHit1Save(4,0)); // variation always in the same direction | |
644 | } else dParam(j,0) = 0.; | |
645 | } | |
646 | ||
647 | // Set new track parameters at first hitForRec | |
648 | trackParamAtHit1Save.SetParameters(paramAtHit1Save); | |
649 | trackParamAtHit1Save.AddParameters(dParam); | |
650 | trackParamAtHit1Save.SetZ(z1); | |
651 | ||
652 | // Extrapolate new track parameters to the z position of the second hitForRec | |
653 | AliMUONTrackExtrap::ExtrapToZ(&trackParamAtHit1Save,hitForRec2->GetZ()); | |
654 | ||
655 | // Calculate the jacobian | |
656 | jacob(2,i) = (trackParamAtHit1Save.GetNonBendingCoor() - nonBendingCoor2) / dParam(i,0); // dx2/dParami | |
657 | jacob(3,i) = (trackParamAtHit1Save.GetBendingCoor() - bendingCoor2 ) / dParam(i,0); // dy2/dParami | |
208f139e | 658 | } |
ea94c18b | 659 | |
660 | // Calculate the error matrix | |
661 | TMatrixD tmp(jacob,TMatrixD::kMult,kParamCov); | |
662 | error = TMatrixD(tmp,TMatrixD::kMultTranspose,jacob); | |
663 | } | |
664 | ||
665 | // Add hitForRec resolution to the error matrix | |
666 | error(0,0) += hitForRec1->GetNonBendingReso2(); | |
667 | error(1,1) += hitForRec1->GetBendingReso2(); | |
668 | error(2,2) += hitForRec2->GetNonBendingReso2(); | |
669 | error(3,3) += hitForRec2->GetBendingReso2(); | |
670 | ||
671 | // invert the error matrix for Chi2 calculation | |
672 | if (error.Determinant() != 0) { | |
673 | error.Invert(); | |
208f139e | 674 | } else { |
ea94c18b | 675 | AliWarning(" Determinant error=0"); |
676 | return 1.e10; | |
208f139e | 677 | } |
678 | ||
ea94c18b | 679 | // Compute the Chi2 value |
680 | TMatrixD tmp2(dPos,TMatrixD::kTransposeMult,error); | |
681 | TMatrixD result(tmp2,TMatrixD::kMult,dPos); | |
682 | ||
683 | return result(0,0); | |
684 | ||
685 | } | |
686 | ||
687 | //__________________________________________________________________________ | |
688 | void AliMUONTrackReconstructor::UpdateTrack(AliMUONTrack &track, AliMUONTrackParam &trackParamAtHit) | |
689 | { | |
690 | /// Add 1 hit to the track candidate | |
691 | /// Update chi2 of the track | |
692 | ||
693 | // Compute local chi2 | |
694 | AliMUONHitForRec* hit = trackParamAtHit.GetHitForRecPtr(); | |
695 | Double_t deltaX = trackParamAtHit.GetNonBendingCoor() - hit->GetNonBendingCoor(); | |
696 | Double_t deltaY = trackParamAtHit.GetBendingCoor() - hit->GetBendingCoor(); | |
697 | Double_t localChi2 = deltaX*deltaX / hit->GetNonBendingReso2() + | |
698 | deltaY*deltaY / hit->GetBendingReso2(); | |
699 | ||
5f4ceff2 | 700 | // Flag hit as being not removable |
701 | trackParamAtHit.SetRemovable(kFALSE); | |
702 | trackParamAtHit.SetLocalChi2(0.); // --> Local chi2 not used | |
703 | ||
ea94c18b | 704 | // Update the chi2 of the new track |
705 | track.SetFitFMin(track.GetFitFMin() + localChi2); | |
706 | ||
707 | // Update TrackParamAtHit | |
708 | track.AddTrackParamAtHit(&trackParamAtHit,trackParamAtHit.GetHitForRecPtr()); | |
709 | track.GetTrackParamAtHit()->Sort(); | |
710 | ||
04b5ea16 | 711 | } |
712 | ||
de2cd600 | 713 | //__________________________________________________________________________ |
ea94c18b | 714 | void AliMUONTrackReconstructor::UpdateTrack(AliMUONTrack &track, AliMUONTrackParam &trackParamAtHit1, AliMUONTrackParam &trackParamAtHit2) |
715 | { | |
716 | /// Add 2 hits to the track candidate | |
717 | /// Update track and local chi2 | |
718 | ||
719 | // Update local chi2 at first hit | |
720 | AliMUONHitForRec* hit1 = trackParamAtHit1.GetHitForRecPtr(); | |
721 | Double_t deltaX = trackParamAtHit1.GetNonBendingCoor() - hit1->GetNonBendingCoor(); | |
722 | Double_t deltaY = trackParamAtHit1.GetBendingCoor() - hit1->GetBendingCoor(); | |
723 | Double_t localChi2AtHit1 = deltaX*deltaX / hit1->GetNonBendingReso2() + | |
724 | deltaY*deltaY / hit1->GetBendingReso2(); | |
725 | trackParamAtHit1.SetLocalChi2(localChi2AtHit1); | |
726 | ||
727 | // Flag first hit as being removable | |
728 | trackParamAtHit1.SetRemovable(kTRUE); | |
729 | ||
730 | // Update local chi2 at second hit | |
731 | AliMUONHitForRec* hit2 = trackParamAtHit2.GetHitForRecPtr(); | |
732 | deltaX = trackParamAtHit2.GetNonBendingCoor() - hit2->GetNonBendingCoor(); | |
733 | deltaY = trackParamAtHit2.GetBendingCoor() - hit2->GetBendingCoor(); | |
734 | Double_t localChi2AtHit2 = deltaX*deltaX / hit2->GetNonBendingReso2() + | |
735 | deltaY*deltaY / hit2->GetBendingReso2(); | |
736 | trackParamAtHit2.SetLocalChi2(localChi2AtHit2); | |
737 | ||
738 | // Flag first hit as being removable | |
739 | trackParamAtHit2.SetRemovable(kTRUE); | |
740 | ||
741 | // Update the chi2 of the new track | |
742 | track.SetFitFMin(track.GetFitFMin() + localChi2AtHit1 + localChi2AtHit2); | |
743 | ||
744 | // Update TrackParamAtHit | |
745 | track.AddTrackParamAtHit(&trackParamAtHit1,trackParamAtHit1.GetHitForRecPtr()); | |
746 | track.AddTrackParamAtHit(&trackParamAtHit2,trackParamAtHit2.GetHitForRecPtr()); | |
747 | track.GetTrackParamAtHit()->Sort(); | |
748 | ||
749 | } | |
750 | ||
751 | //__________________________________________________________________________ | |
752 | Bool_t AliMUONTrackReconstructor::RecoverTrack(AliMUONTrack &trackCandidate, Int_t nextStation) | |
753 | { | |
754 | /// Try to recover the track candidate in the next station | |
755 | /// by removing the worst of the two hits attached in the current station | |
756 | /// Return kTRUE if recovering succeeds | |
757 | AliDebug(1,"Enter RecoverTrack"); | |
758 | ||
759 | // Do not try to recover track until we have attached hit(s) on station(1..) 3 | |
760 | if (nextStation > 1) return kFALSE; | |
761 | ||
762 | Int_t worstHitNumber = -1; | |
763 | Double_t localChi2, worstLocalChi2 = 0.; | |
764 | ||
765 | // Look for the hit to remove | |
766 | for (Int_t hitNumber = 0; hitNumber < 2; hitNumber++) { | |
767 | AliMUONTrackParam *trackParamAtHit = (AliMUONTrackParam*)trackCandidate.GetTrackParamAtHit()->UncheckedAt(hitNumber); | |
768 | ||
769 | // check if current hit is removable | |
770 | if (!trackParamAtHit->IsRemovable()) return kFALSE; | |
771 | ||
772 | // Pick up hit with the worst chi2 | |
773 | localChi2 = trackParamAtHit->GetLocalChi2(); | |
774 | if (localChi2 > worstLocalChi2) { | |
775 | worstLocalChi2 = localChi2; | |
776 | worstHitNumber = hitNumber; | |
777 | } | |
778 | } | |
779 | ||
780 | // Reset best hit as being NOT removable | |
781 | ((AliMUONTrackParam*)trackCandidate.GetTrackParamAtHit()->UncheckedAt((worstHitNumber+1)%2))->SetRemovable(kFALSE); | |
782 | ||
783 | // Remove the worst hit | |
784 | trackCandidate.RemoveTrackParamAtHit((AliMUONTrackParam*)trackCandidate.GetTrackParamAtHit()->UncheckedAt(worstHitNumber)); | |
785 | ||
786 | // Re-fit the track: | |
787 | // Do not take into account the multiple scattering to speed up the fit | |
788 | // Calculate the track parameter covariance matrix | |
789 | trackCandidate.SetFitWithVertex(kFALSE); // To be sure | |
790 | Fit(trackCandidate, kFALSE, kTRUE); | |
791 | ||
792 | // Look for new hit(s) in next station | |
793 | return FollowTrackInStation(trackCandidate,nextStation); | |
794 | ||
795 | } | |
796 | ||
797 | //__________________________________________________________________________ | |
798 | void AliMUONTrackReconstructor::SetVertexForFit(AliMUONTrack &trackCandidate) | |
de2cd600 | 799 | { |
208f139e | 800 | /// Add the vertex as a measured hit to constrain the fit of the "trackCandidate" |
801 | /// Compute the vertex resolution from natural vertex dispersion and | |
802 | /// multiple scattering effets according to trackCandidate path in absorber | |
803 | /// It is necessary to account for multiple scattering effects here instead of during the fit of | |
804 | /// the "trackCandidate" to do not influence the result by changing track resolution at vertex | |
805 | AliDebug(1,"Enter SetVertexForFit"); | |
de2cd600 | 806 | |
3304fa09 | 807 | Double_t nonBendingReso2 = AliMUONReconstructor::GetRecoParam()->GetNonBendingVertexDispersion() * |
808 | AliMUONReconstructor::GetRecoParam()->GetNonBendingVertexDispersion(); | |
809 | Double_t bendingReso2 = AliMUONReconstructor::GetRecoParam()->GetBendingVertexDispersion() * | |
810 | AliMUONReconstructor::GetRecoParam()->GetBendingVertexDispersion(); | |
208f139e | 811 | // add multiple scattering effets |
ea94c18b | 812 | AliMUONTrackParam paramAtVertex(*((AliMUONTrackParam*)(trackCandidate.GetTrackParamAtHit()->First()))); |
208f139e | 813 | paramAtVertex.DeleteCovariances(); // to be sure to account only for multiple scattering |
814 | AliMUONTrackExtrap::ExtrapToVertexUncorrected(¶mAtVertex,0.); | |
ea94c18b | 815 | const TMatrixD& kParamCov = paramAtVertex.GetCovariances(); |
816 | nonBendingReso2 += kParamCov(0,0); | |
817 | bendingReso2 += kParamCov(2,2); | |
208f139e | 818 | // Set the vertex |
819 | AliMUONHitForRec vertex; // Coordinates set to (0.,0.,0.) by default | |
820 | vertex.SetNonBendingReso2(nonBendingReso2); | |
821 | vertex.SetBendingReso2(bendingReso2); | |
ea94c18b | 822 | trackCandidate.SetVertex(&vertex); |
208f139e | 823 | } |
824 | ||
825 | //__________________________________________________________________________ | |
ea94c18b | 826 | void AliMUONTrackReconstructor::Fit(AliMUONTrack &track, Bool_t includeMCS, Bool_t calcCov) |
208f139e | 827 | { |
ea94c18b | 828 | /// Fit the track "track" w/wo multiple Coulomb scattering according to "includeMCS". |
de2cd600 | 829 | |
208f139e | 830 | Double_t benC, errorParam, invBenP, nonBenC, x, y; |
de2cd600 | 831 | AliMUONTrackParam *trackParam; |
208f139e | 832 | Double_t arg[1], fedm, errdef, fitFMin; |
833 | Int_t npari, nparx; | |
834 | Int_t status, covStatus; | |
835 | ||
8cde4af5 | 836 | // Instantiate gMinuit if not already done |
837 | if (!gMinuit) gMinuit = new TMinuit(6); | |
208f139e | 838 | // Clear MINUIT parameters |
839 | gMinuit->mncler(); | |
840 | // Give the fitted track to MINUIT | |
ea94c18b | 841 | gMinuit->SetObjectFit(&track); |
208f139e | 842 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructor") >= 2) || (AliLog::GetGlobalDebugLevel() >= 2)) { |
843 | // Define print level | |
844 | arg[0] = 1; | |
845 | gMinuit->mnexcm("SET PRI", arg, 1, status); | |
846 | // Print covariance matrix | |
847 | gMinuit->mnexcm("SHO COV", arg, 0, status); | |
848 | } else { | |
849 | arg[0] = -1; | |
850 | gMinuit->mnexcm("SET PRI", arg, 1, status); | |
851 | } | |
de2cd600 | 852 | // No warnings |
208f139e | 853 | gMinuit->mnexcm("SET NOW", arg, 0, status); |
854 | // Define strategy | |
855 | //arg[0] = 2; | |
856 | //gMinuit->mnexcm("SET STR", arg, 1, status); | |
857 | ||
ea94c18b | 858 | // set flag w/wo multiple scattering according to "includeMCS" |
859 | track.SetFitWithMCS(includeMCS); | |
860 | if (includeMCS) { | |
861 | // compute hit weights only once | |
862 | if (!track.ComputeHitWeights()) { | |
863 | AliWarning("cannot take into account the multiple scattering effects"); | |
864 | track.SetFitWithMCS(kFALSE); | |
865 | } | |
866 | } | |
867 | ||
868 | // Set fitting function | |
869 | gMinuit->SetFCN(TrackChi2); | |
208f139e | 870 | |
871 | // Set fitted parameters (!! The order is very important for the covariance matrix !!) | |
ea94c18b | 872 | trackParam = (AliMUONTrackParam*) (track.GetTrackParamAtHit()->First()); |
de2cd600 | 873 | // could be tried with no limits for the search (min=max=0) ???? |
208f139e | 874 | // mandatory limits in non Bending to avoid NaN values of parameters |
875 | gMinuit->mnparm(0, "X", trackParam->GetNonBendingCoor(), 0.03, -500.0, 500.0, status); | |
876 | gMinuit->mnparm(1, "NonBenS", trackParam->GetNonBendingSlope(), 0.001, -0.5, 0.5, status); | |
877 | // mandatory limits in Bending to avoid NaN values of parameters | |
878 | gMinuit->mnparm(2, "Y", trackParam->GetBendingCoor(), 0.10, -500.0, 500.0, status); | |
879 | gMinuit->mnparm(3, "BenS", trackParam->GetBendingSlope(), 0.001, -0.5, 0.5, status); | |
880 | gMinuit->mnparm(4, "InvBenP", trackParam->GetInverseBendingMomentum(), 0.003, -0.4, 0.4, status); | |
881 | ||
de2cd600 | 882 | // minimization |
208f139e | 883 | gMinuit->mnexcm("MIGRAD", arg, 0, status); |
884 | ||
885 | // Calculate the covariance matrix more accurately if required | |
886 | if (calcCov) gMinuit->mnexcm("HESSE", arg, 0, status); | |
8cde4af5 | 887 | |
de2cd600 | 888 | // get results into "invBenP", "benC", "nonBenC" ("x", "y") |
208f139e | 889 | gMinuit->GetParameter(0, x, errorParam); |
890 | trackParam->SetNonBendingCoor(x); | |
891 | gMinuit->GetParameter(1, nonBenC, errorParam); | |
de2cd600 | 892 | trackParam->SetNonBendingSlope(nonBenC); |
208f139e | 893 | gMinuit->GetParameter(2, y, errorParam); |
894 | trackParam->SetBendingCoor(y); | |
895 | gMinuit->GetParameter(3, benC, errorParam); | |
896 | trackParam->SetBendingSlope(benC); | |
897 | gMinuit->GetParameter(4, invBenP, errorParam); | |
898 | trackParam->SetInverseBendingMomentum(invBenP); | |
899 | ||
de2cd600 | 900 | // global result of the fit |
208f139e | 901 | gMinuit->mnstat(fitFMin, fedm, errdef, npari, nparx, covStatus); |
ea94c18b | 902 | track.SetFitFMin(fitFMin); |
208f139e | 903 | |
904 | // Get the covariance matrix if required | |
905 | if (calcCov) { | |
906 | // Covariance matrix according to HESSE status | |
907 | // If problem then keep only the diagonal terms (variances) | |
908 | Double_t matrix[5][5]; | |
909 | gMinuit->mnemat(&matrix[0][0],5); | |
910 | if (covStatus == 3) trackParam->SetCovariances(matrix); | |
911 | else trackParam->SetVariances(matrix); | |
ea94c18b | 912 | } else trackParam->DeleteCovariances(); |
208f139e | 913 | |
de2cd600 | 914 | } |
915 | ||
916 | //__________________________________________________________________________ | |
ea94c18b | 917 | void TrackChi2(Int_t & /*nParam*/, Double_t * /*gradient*/, Double_t &chi2, Double_t *param, Int_t /*flag*/) |
de2cd600 | 918 | { |
ea94c18b | 919 | /// Return the "Chi2" to be minimized with Minuit for track fitting. |
2457f726 | 920 | /// Assumes that the track hits are sorted according to increasing Z. |
921 | /// Track parameters at each TrackHit are updated accordingly. | |
ea94c18b | 922 | /// Vertex is used according to the flag "trackBeingFitted->GetFitWithVertex()". |
923 | /// Multiple Coulomb scattering is taken into account according to the flag "trackBeingFitted->GetFitWithMCS()". | |
208f139e | 924 | |
925 | AliMUONTrack *trackBeingFitted = (AliMUONTrack*) gMinuit->GetObjectFit(); | |
ea94c18b | 926 | AliMUONTrackParam* trackParamAtHit = (AliMUONTrackParam*) trackBeingFitted->GetTrackParamAtHit()->First(); |
208f139e | 927 | Double_t dX, dY; |
ea94c18b | 928 | chi2 = 0.; // initialize chi2 |
208f139e | 929 | |
ea94c18b | 930 | // update track parameters |
931 | trackParamAtHit->SetNonBendingCoor(param[0]); | |
932 | trackParamAtHit->SetNonBendingSlope(param[1]); | |
933 | trackParamAtHit->SetBendingCoor(param[2]); | |
934 | trackParamAtHit->SetBendingSlope(param[3]); | |
935 | trackParamAtHit->SetInverseBendingMomentum(param[4]); | |
936 | trackBeingFitted->UpdateTrackParamAtHit(); | |
208f139e | 937 | |
938 | // Take the vertex into account in the fit if required | |
939 | if (trackBeingFitted->GetFitWithVertex()) { | |
ea94c18b | 940 | AliMUONTrackParam paramAtVertex(*trackParamAtHit); |
208f139e | 941 | AliMUONTrackExtrap::ExtrapToZ(¶mAtVertex, 0.); |
942 | AliMUONHitForRec *vertex = trackBeingFitted->GetVertex(); | |
943 | if (!vertex) { | |
944 | cout<<"Error in TrackChi2: Want to use the vertex in tracking but it has not been created!!"<<endl; | |
945 | exit(-1); | |
946 | } | |
947 | dX = vertex->GetNonBendingCoor() - paramAtVertex.GetNonBendingCoor(); | |
948 | dY = vertex->GetBendingCoor() - paramAtVertex.GetBendingCoor(); | |
ea94c18b | 949 | chi2 += dX * dX / vertex->GetNonBendingReso2() + dY * dY / vertex->GetBendingReso2(); |
de2cd600 | 950 | } |
208f139e | 951 | |
ea94c18b | 952 | // compute chi2 w/wo multiple scattering |
b709ac13 | 953 | chi2 += trackBeingFitted->ComputeGlobalChi2(trackBeingFitted->GetFitWithMCS()); |
954 | ||
955 | } | |
956 | ||
957 | //__________________________________________________________________________ | |
958 | void AliMUONTrackReconstructor::ComplementTracks() | |
959 | { | |
960 | /// Complete tracks by adding missing clusters (if there is an overlap between | |
961 | /// two detection elements, the track may have two clusters in the same chamber) | |
962 | /// Re-fit track parameters and covariances | |
963 | AliDebug(1,"Enter ComplementTracks"); | |
964 | ||
965 | Int_t chamberId, detElemId; | |
966 | Double_t chi2OfHitForRec, bestChi2OfHitForRec; | |
967 | Bool_t foundOneHit, trackModified; | |
968 | AliMUONHitForRec* hitForRec; | |
969 | AliMUONTrackParam* trackParam, *nextTrackParam; | |
970 | AliMUONTrackParam copyOfTrackParam; | |
971 | AliMUONTrackParam trackParamAtHit; | |
972 | AliMUONTrackParam bestTrackParamAtHit; | |
3304fa09 | 973 | Double_t sigmaCut2 = AliMUONReconstructor::GetRecoParam()->GetSigmaCutForTracking() * |
974 | AliMUONReconstructor::GetRecoParam()->GetSigmaCutForTracking(); | |
b709ac13 | 975 | |
976 | // Remove double track to complete only "good" tracks | |
977 | RemoveDoubleTracks(); | |
978 | ||
979 | AliMUONTrack *track = (AliMUONTrack*) fRecTracksPtr->First(); | |
980 | while (track) { | |
981 | trackModified = kFALSE; | |
982 | ||
983 | trackParam = (AliMUONTrackParam*)track->GetTrackParamAtHit()->First(); | |
984 | while (trackParam) { | |
985 | foundOneHit = kFALSE; | |
3304fa09 | 986 | bestChi2OfHitForRec = 2. * sigmaCut2; // 2 because 2 quantities in chi2 |
b709ac13 | 987 | |
988 | // prepare nextTrackParam before adding new cluster because of the sorting | |
989 | nextTrackParam = (AliMUONTrackParam*)track->GetTrackParamAtHit()->After(trackParam); | |
990 | ||
991 | chamberId = trackParam->GetHitForRecPtr()->GetChamberNumber(); | |
992 | detElemId = trackParam->GetHitForRecPtr()->GetDetElemId(); | |
993 | ||
994 | // recover track parameters from local fit and put them into a copy of trackParam | |
995 | copyOfTrackParam.SetZ(trackParam->GetZ()); | |
996 | copyOfTrackParam.SetParameters(trackParam->GetSmoothParameters()); | |
997 | copyOfTrackParam.SetCovariances(trackParam->GetSmoothCovariances()); | |
998 | ||
999 | // look for one second candidate in the same chamber | |
1000 | for (Int_t hit = 0; hit < fNHitsForRecPerChamber[chamberId]; hit++) { | |
1001 | ||
1002 | hitForRec = (AliMUONHitForRec*) fHitsForRecPtr->UncheckedAt(fIndexOfFirstHitForRecPerChamber[chamberId]+hit); | |
1003 | ||
1004 | // look for a cluster in another detection element | |
1005 | if (hitForRec->GetDetElemId() == detElemId) continue; | |
1006 | ||
1007 | // try to add the current hit fast | |
1008 | if (!TryOneHitForRecFast(copyOfTrackParam, hitForRec)) continue; | |
1009 | ||
1010 | // try to add the current hit accurately | |
1011 | chi2OfHitForRec = TryOneHitForRec(copyOfTrackParam, hitForRec, trackParamAtHit); | |
1012 | ||
1013 | // if better chi2 then prepare to add this cluster to the track | |
1014 | if (chi2OfHitForRec < bestChi2OfHitForRec) { | |
1015 | bestChi2OfHitForRec = chi2OfHitForRec; | |
1016 | bestTrackParamAtHit = trackParamAtHit; | |
1017 | foundOneHit = kTRUE; | |
1018 | } | |
1019 | ||
1020 | } | |
1021 | ||
1022 | // add new cluster if any | |
1023 | if (foundOneHit) { | |
1024 | UpdateTrack(*track,bestTrackParamAtHit); | |
1025 | bestTrackParamAtHit.SetAloneInChamber(kFALSE); | |
1026 | trackParam->SetAloneInChamber(kFALSE); | |
1027 | trackModified = kTRUE; | |
1028 | } | |
1029 | ||
1030 | trackParam = nextTrackParam; | |
1031 | } | |
1032 | ||
1033 | // re-fit track parameters if needed | |
1034 | if (trackModified) Fit(*track, kTRUE, kTRUE); | |
1035 | ||
1036 | track = (AliMUONTrack*) fRecTracksPtr->After(track); | |
1037 | } | |
ea94c18b | 1038 | |
de2cd600 | 1039 | } |
1040 | ||
1041 | //__________________________________________________________________________ | |
ea94c18b | 1042 | void AliMUONTrackReconstructor::ImproveTracks() |
de2cd600 | 1043 | { |
ea94c18b | 1044 | /// Improve tracks by removing clusters with local chi2 highter than the defined cut |
1045 | /// Recompute track parameters and covariances at the remaining clusters | |
1046 | AliDebug(1,"Enter ImproveTracks"); | |
208f139e | 1047 | |
ea94c18b | 1048 | Double_t localChi2, worstLocalChi2; |
b709ac13 | 1049 | Int_t worstChamber, previousChamber; |
1050 | AliMUONTrack *track, *nextTrack; | |
1051 | AliMUONTrackParam *trackParamAtHit, *worstTrackParamAtHit, *previousTrackParam, *nextTrackParam; | |
3304fa09 | 1052 | Double_t sigmaCut2 = AliMUONReconstructor::GetRecoParam()->GetSigmaCutForImprovement() * |
1053 | AliMUONReconstructor::GetRecoParam()->GetSigmaCutForImprovement(); | |
208f139e | 1054 | |
ea94c18b | 1055 | // Remove double track to improve only "good" tracks |
1056 | RemoveDoubleTracks(); | |
1057 | ||
b709ac13 | 1058 | track = (AliMUONTrack*) fRecTracksPtr->First(); |
ea94c18b | 1059 | while (track) { |
1060 | ||
b709ac13 | 1061 | // prepare next track in case the actual track is suppressed |
1062 | nextTrack = (AliMUONTrack*) fRecTracksPtr->After(track); | |
1063 | ||
ea94c18b | 1064 | while (!track->IsImproved()) { |
1065 | ||
1066 | // Update track parameters and covariances | |
1067 | track->UpdateCovTrackParamAtHit(); | |
1068 | ||
1069 | // Compute local chi2 of each hits | |
1070 | track->ComputeLocalChi2(kTRUE); | |
1071 | ||
1072 | // Look for the hit to remove | |
b709ac13 | 1073 | worstTrackParamAtHit = NULL; |
ea94c18b | 1074 | worstLocalChi2 = 0.; |
1075 | trackParamAtHit = (AliMUONTrackParam*) track->GetTrackParamAtHit()->First(); | |
1076 | while (trackParamAtHit) { | |
1077 | ||
1078 | // Pick up hit with the worst chi2 | |
1079 | localChi2 = trackParamAtHit->GetLocalChi2(); | |
1080 | if (localChi2 > worstLocalChi2) { | |
1081 | worstLocalChi2 = localChi2; | |
1082 | worstTrackParamAtHit = trackParamAtHit; | |
1083 | } | |
1084 | ||
1085 | trackParamAtHit = (AliMUONTrackParam*) track->GetTrackParamAtHit()->After(trackParamAtHit); | |
de2cd600 | 1086 | } |
ea94c18b | 1087 | |
1088 | // Check if bad hit found | |
1089 | if (!worstTrackParamAtHit) { | |
1090 | track->SetImproved(kTRUE); | |
1091 | break; | |
de2cd600 | 1092 | } |
ea94c18b | 1093 | |
b709ac13 | 1094 | // Check whether the worst chi2 is under requirement or not |
3304fa09 | 1095 | if (worstLocalChi2 < 2. * sigmaCut2) { // 2 because 2 quantities in chi2 |
ea94c18b | 1096 | track->SetImproved(kTRUE); |
1097 | break; | |
de2cd600 | 1098 | } |
ea94c18b | 1099 | |
b709ac13 | 1100 | // if the worst hit is not removable then remove the entire track |
1101 | if (!worstTrackParamAtHit->IsRemovable() && worstTrackParamAtHit->IsAloneInChamber()) { | |
1102 | fRecTracksPtr->Remove(track); | |
1103 | fNRecTracks--; | |
ea94c18b | 1104 | break; |
1105 | } | |
1106 | ||
b709ac13 | 1107 | // Reset the second hit in the same station as being not removable |
1108 | // or reset the second hit in the same chamber as being alone | |
ea94c18b | 1109 | worstChamber = worstTrackParamAtHit->GetHitForRecPtr()->GetChamberNumber(); |
b709ac13 | 1110 | previousTrackParam = (AliMUONTrackParam*) track->GetTrackParamAtHit()->Before(worstTrackParamAtHit); |
1111 | nextTrackParam = (AliMUONTrackParam*) track->GetTrackParamAtHit()->After(worstTrackParamAtHit); | |
1112 | if (worstTrackParamAtHit->IsAloneInChamber()) { // Worst hit removable and alone in chamber | |
1113 | ||
1114 | if (worstChamber%2 == 0) { // Modify flags in next chamber | |
1115 | ||
1116 | nextTrackParam->SetRemovable(kFALSE); | |
1117 | if (!nextTrackParam->IsAloneInChamber()) // Make sure both hits in second chamber are not removable anymore | |
1118 | ((AliMUONTrackParam*) track->GetTrackParamAtHit()->After(nextTrackParam))->SetRemovable(kFALSE); | |
1119 | ||
1120 | } else { // Modify flags in previous chamber | |
1121 | ||
1122 | previousTrackParam->SetRemovable(kFALSE); | |
1123 | if (!previousTrackParam->IsAloneInChamber()) // Make sure both hits in second chamber are not removable anymore | |
1124 | ((AliMUONTrackParam*) track->GetTrackParamAtHit()->Before(previousTrackParam))->SetRemovable(kFALSE); | |
1125 | ||
1126 | } | |
1127 | ||
1128 | } else { // Worst hit not alone in its chamber | |
1129 | ||
1130 | if (previousTrackParam) previousChamber = previousTrackParam->GetHitForRecPtr()->GetChamberNumber(); | |
1131 | else previousChamber = -1; | |
1132 | ||
1133 | if (previousChamber == worstChamber) { // the second hit on the same chamber is the previous one | |
1134 | ||
1135 | previousTrackParam->SetAloneInChamber(kTRUE); | |
1136 | // transfert the removability to the second hit | |
1137 | if (worstTrackParamAtHit->IsRemovable()) previousTrackParam->SetRemovable(kTRUE); | |
1138 | ||
1139 | } else { // the second hit on the same chamber is the next one | |
1140 | ||
1141 | nextTrackParam->SetAloneInChamber(kTRUE); | |
1142 | // transfert the removability to the second hit | |
1143 | if (worstTrackParamAtHit->IsRemovable()) nextTrackParam->SetRemovable(kTRUE); | |
1144 | ||
1145 | } | |
1146 | ||
1147 | } | |
ea94c18b | 1148 | |
1149 | // Remove the worst hit | |
1150 | track->RemoveTrackParamAtHit(worstTrackParamAtHit); | |
1151 | ||
1152 | // Re-fit the track: | |
1153 | // Take into account the multiple scattering | |
1154 | // Calculate the track parameter covariance matrix | |
ea94c18b | 1155 | Fit(*track, kTRUE, kTRUE); |
1156 | ||
1157 | // Printout for debuging | |
1158 | if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
1159 | cout << "ImproveTracks: track " << fRecTracksPtr->IndexOf(track)+1 << " improved " << endl; | |
1160 | } | |
1161 | ||
de2cd600 | 1162 | } |
ea94c18b | 1163 | |
b709ac13 | 1164 | track = nextTrack; |
de2cd600 | 1165 | } |
1166 | ||
b709ac13 | 1167 | // compress the array in case of some tracks have been removed |
1168 | fRecTracksPtr->Compress(); | |
1169 | ||
de2cd600 | 1170 | } |
1171 | ||
208f139e | 1172 | //__________________________________________________________________________ |
ea94c18b | 1173 | void AliMUONTrackReconstructor::Finalize() |
b8dc484b | 1174 | { |
b58638a9 | 1175 | /// Fill AliMUONTrack's fHitForRecAtHit array |
1176 | /// Recompute track parameters and covariances at each attached cluster from those at the first one | |
b709ac13 | 1177 | |
b8dc484b | 1178 | AliMUONTrack *track; |
de2cd600 | 1179 | AliMUONTrackParam *trackParamAtHit; |
b58638a9 | 1180 | |
b8dc484b | 1181 | track = (AliMUONTrack*) fRecTracksPtr->First(); |
1182 | while (track) { | |
ea94c18b | 1183 | |
1184 | // update track parameters if not already done | |
1185 | if (!track->IsImproved()) track->UpdateCovTrackParamAtHit(); | |
1186 | ||
de2cd600 | 1187 | trackParamAtHit = (AliMUONTrackParam*) (track->GetTrackParamAtHit()->First()); |
1188 | while (trackParamAtHit) { | |
ea94c18b | 1189 | |
b58638a9 | 1190 | // update array of track hit |
ea94c18b | 1191 | track->AddHitForRecAtHit(trackParamAtHit->GetHitForRecPtr()); |
1192 | ||
1193 | trackParamAtHit = (AliMUONTrackParam*) (track->GetTrackParamAtHit()->After(trackParamAtHit)); | |
de2cd600 | 1194 | } |
ea94c18b | 1195 | |
b8dc484b | 1196 | track = (AliMUONTrack*) fRecTracksPtr->After(track); |
ea94c18b | 1197 | |
de2cd600 | 1198 | } |
ea94c18b | 1199 | |
a9e2aefa | 1200 | } |
1201 | ||
276c44b7 | 1202 |