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[u/mrichter/AliRoot.git] / MUON / AliMUONVTrackReconstructor.cxx
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8d0843c6 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
18////////////////////////////////////
06ca6d7b 19///
c4ee792d 20/// \class AliMUONVTrackReconstructor
06ca6d7b 21/// Virtual MUON track reconstructor in ALICE (class renamed from AliMUONEventReconstructor)
22///
23/// This class contains as data:
24/// * a pointer to the array of hits to be reconstructed (the event)
06ca6d7b 25/// * a pointer to the array of reconstructed tracks
26///
27/// It contains as methods, among others:
28/// * EventReconstruct to build the muon tracks
29/// * EventReconstructTrigger to build the trigger tracks
30///
dfb547bf 31/// Several options and adjustable parameters are available for both Kalman and Original
32/// tracking algorithms (hard coded for the moment in AliMUONVTrackReconstructor.cxx):
33/// - *fgkSigmaToCutForTracking* : quality cut used to select new clusters to be
34/// attached to the track candidate and to select good tracks.
019df241 35/// - *fgkMakeTrackCandidatesFast* : if this flag is set to 'true', the track candidates
36/// are made assuming linear propagation between stations 4 and 5.
dfb547bf 37/// - *fgkTrackAllTracks* : according to the value of this flag, in case that several
38/// new clusters pass the quality cut, either we consider all the possibilities
39/// (duplicating tracks) or we attach only the best cluster.
40/// - *fgkRecoverTracks* : if this flag is set to 'true', we try to recover the tracks
41/// lost during the tracking by removing the worst of the 2 clusters attached in the
42/// previous station.
43/// - *fgkImproveTracks* : if this flag is set to 'true', we try to improve the quality
44/// of the tracks at the end of the tracking by removing clusters that do not pass
45/// new quality cut (within the limit that we must keep at least one cluster per
46/// the station).
47/// - *fgkSigmaToCutForImprovement* : quality cut used when we try to improve the
48/// quality of the tracks.
49///
c4ee792d 50/// \author Philippe Pillot
51///
8d0843c6 52////////////////////////////////////
53
8d0843c6 54#include "AliMUONVTrackReconstructor.h"
7ec3b9cf 55
8d0843c6 56#include "AliMUONConstants.h"
ea94c18b 57#include "AliMUONRawCluster.h"
8d0843c6 58#include "AliMUONHitForRec.h"
208f139e 59#include "AliMUONObjectPair.h"
8d0843c6 60#include "AliMUONTriggerTrack.h"
e1a10d41 61#include "AliMUONTriggerCircuit.h"
8d0843c6 62#include "AliMUONLocalTrigger.h"
63#include "AliMUONGlobalTrigger.h"
8d0843c6 64#include "AliMUONTrack.h"
37827b29 65#include "AliMUONTrackParam.h"
66#include "AliMUONTrackExtrap.h"
7771752e 67#include "AliMUONTrackHitPattern.h"
7ec3b9cf 68#include "AliMUONVTrackStore.h"
69#include "AliMUONVClusterStore.h"
70#include "AliMUONRawCluster.h"
7ec3b9cf 71#include "AliMUONVTriggerStore.h"
72#include "AliMUONVTriggerTrackStore.h"
ea94c18b 73#include "AliMpDEManager.h"
74
75#include "AliLog.h"
76#include "AliTracker.h"
8d0843c6 77
4889d34c 78#include <TClonesArray.h>
79#include <TMath.h>
ea94c18b 80#include <TMatrixD.h>
81
82#include <Riostream.h>
4889d34c 83
78649106 84/// \cond CLASSIMP
8d0843c6 85ClassImp(AliMUONVTrackReconstructor) // Class implementation in ROOT context
78649106 86/// \endcond
8d0843c6 87
019df241 88
8d0843c6 89//************* Defaults parameters for reconstruction
90const Double_t AliMUONVTrackReconstructor::fgkDefaultMinBendingMomentum = 3.0;
91const Double_t AliMUONVTrackReconstructor::fgkDefaultMaxBendingMomentum = 3000.0;
208f139e 92const Double_t AliMUONVTrackReconstructor::fgkDefaultMaxNormChi2MatchTrigger = 16.0;
019df241 93const Double_t AliMUONVTrackReconstructor::fgkMaxTrackingDistanceBending = 2.;
94const Double_t AliMUONVTrackReconstructor::fgkMaxTrackingDistanceNonBending = 2.;
8d0843c6 95
ea94c18b 96const Double_t AliMUONVTrackReconstructor::fgkSigmaToCutForTracking = 6.0;
019df241 97const Bool_t AliMUONVTrackReconstructor::fgkMakeTrackCandidatesFast = kFALSE;
ea94c18b 98const Bool_t AliMUONVTrackReconstructor::fgkTrackAllTracks = kTRUE;
ea94c18b 99const Bool_t AliMUONVTrackReconstructor::fgkRecoverTracks = kTRUE;
100const Bool_t AliMUONVTrackReconstructor::fgkImproveTracks = kTRUE;
019df241 101const Double_t AliMUONVTrackReconstructor::fgkSigmaToCutForImprovement = 4.0;
ea94c18b 102
103
104 //__________________________________________________________________________
7ec3b9cf 105AliMUONVTrackReconstructor::AliMUONVTrackReconstructor()
8d0843c6 106 : TObject(),
107 fMinBendingMomentum(fgkDefaultMinBendingMomentum),
108 fMaxBendingMomentum(fgkDefaultMaxBendingMomentum),
208f139e 109 fMaxNormChi2MatchTrigger(fgkDefaultMaxNormChi2MatchTrigger),
8d0843c6 110 fHitsForRecPtr(0x0),
111 fNHitsForRec(0),
112 fNHitsForRecPerChamber(0x0),
113 fIndexOfFirstHitForRecPerChamber(0x0),
8d0843c6 114 fRecTracksPtr(0x0),
7ec3b9cf 115 fNRecTracks(0)
8d0843c6 116{
117 /// Constructor for class AliMUONVTrackReconstructor
8d0843c6 118 fNHitsForRecPerChamber = new Int_t[AliMUONConstants::NTrackingCh()];
119 fIndexOfFirstHitForRecPerChamber = new Int_t[AliMUONConstants::NTrackingCh()];
120
8d0843c6 121 // Memory allocation for the TClonesArray of hits for reconstruction
122 // Is 10000 the right size ????
123 fHitsForRecPtr = new TClonesArray("AliMUONHitForRec", 10000);
ea94c18b 124
125 // Memory allocation for the TClonesArray of reconstructed tracks
126 fRecTracksPtr = new TClonesArray("AliMUONTrack", 10);
7ec3b9cf 127
208f139e 128 // set the magnetic field for track extrapolations
8d0843c6 129 const AliMagF* kField = AliTracker::GetFieldMap();
130 if (!kField) AliFatal("No field available");
37827b29 131 AliMUONTrackExtrap::SetField(kField);
8d0843c6 132}
133
134 //__________________________________________________________________________
ea94c18b 135AliMUONVTrackReconstructor::~AliMUONVTrackReconstructor()
8d0843c6 136{
137 /// Destructor for class AliMUONVTrackReconstructor
8d0843c6 138 delete [] fNHitsForRecPerChamber;
139 delete [] fIndexOfFirstHitForRecPerChamber;
8d0843c6 140 delete fHitsForRecPtr;
ea94c18b 141 delete fRecTracksPtr;
8d0843c6 142}
143
ea94c18b 144 //__________________________________________________________________________
145void AliMUONVTrackReconstructor::ResetHitsForRec()
146{
147 /// To reset the TClonesArray of HitsForRec,
148 /// and the number of HitForRec and the index of the first HitForRec per chamber
149 if (fHitsForRecPtr) fHitsForRecPtr->Clear("C");
150 fNHitsForRec = 0;
151 for (Int_t ch = 0; ch < AliMUONConstants::NTrackingCh(); ch++) {
152 fNHitsForRecPerChamber[ch] = 0;
153 fIndexOfFirstHitForRecPerChamber[ch] = 0;
154 }
155}
156
157 //__________________________________________________________________________
158void AliMUONVTrackReconstructor::ResetTracks()
159{
160 /// To reset the TClonesArray of reconstructed tracks
161 if (fRecTracksPtr) fRecTracksPtr->Clear("C");
162 fNRecTracks = 0;
163 return;
164}
165
166 //__________________________________________________________________________
167void AliMUONVTrackReconstructor::EventReconstruct(const AliMUONVClusterStore& clusterStore, AliMUONVTrackStore& trackStore)
168{
169 /// To reconstruct one event
170 AliDebug(1,"");
171
172 ResetTracks();
173 ResetHitsForRec();
174 AddHitsForRecFromRawClusters(clusterStore);
175 MakeTracks();
176
177 // Add tracks to MUON data container
178 for (Int_t i=0; i<fNRecTracks; ++i)
179 {
180 AliMUONTrack * track = (AliMUONTrack*) fRecTracksPtr->At(i);
181 trackStore.Add(*track);
182 }
183}
184
185 //__________________________________________________________________________
186void AliMUONVTrackReconstructor::AddHitsForRecFromRawClusters(const AliMUONVClusterStore& clusterStore)
7ec3b9cf 187{
188 /// Build internal array of hit for rec from clusterStore
189
190 TIter next(clusterStore.CreateIterator());
191 AliMUONRawCluster* clus(0x0);
192 Int_t iclus(0);
193
194 while ( ( clus = static_cast<AliMUONRawCluster*>(next()) ) )
195 {
196 // new AliMUONHitForRec from raw cluster
197 // and increment number of AliMUONHitForRec's (total and in chamber)
198 AliMUONHitForRec* hitForRec = new ((*fHitsForRecPtr)[fNHitsForRec]) AliMUONHitForRec(clus);
199 fNHitsForRec++;
200 // more information into HitForRec
201 hitForRec->SetBendingReso2(clus->GetErrY() * clus->GetErrY());
202 hitForRec->SetNonBendingReso2(clus->GetErrX() * clus->GetErrX());
203 // original raw cluster
204 Int_t ch = AliMpDEManager::GetChamberId(clus->GetDetElemId());
205 hitForRec->SetChamberNumber(ch);
206 hitForRec->SetHitNumber(iclus);
207 // Z coordinate of the raw cluster (cm)
208 hitForRec->SetZ(clus->GetZ(0));
209 if (AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructor") >= 3) {
210 cout << "Chamber " << ch <<" raw cluster " << iclus << " : " << endl;
211 clus->Print("full");
212 cout << "AliMUONHitForRec number (1...): " << fNHitsForRec << endl;
213 hitForRec->Print("full");
214 }
215 ++iclus;
216 } // end of chamber loop
217
218 SortHitsForRecWithIncreasingChamber();
219
220 AliDebug(1,"End of AddHitsForRecFromRawClusters");
221
222 if (AliLog::GetGlobalDebugLevel() > 0)
223 {
224 AliDebug(1, Form("NHitsForRec: %d",fNHitsForRec));
225 for (Int_t ch = 0; ch < AliMUONConstants::NTrackingCh(); ch++)
226 {
227 AliDebug(1, Form("Chamber(0...): %d",ch));
228 AliDebug(1, Form("NHitsForRec: %d", fNHitsForRecPerChamber[ch]));
229 AliDebug(1, Form("Index(first HitForRec): %d", fIndexOfFirstHitForRecPerChamber[ch]));
230 for (Int_t hit = fIndexOfFirstHitForRecPerChamber[ch];
231 hit < fIndexOfFirstHitForRecPerChamber[ch] + fNHitsForRecPerChamber[ch];
232 hit++) {
233 AliDebug(1, Form("HitForRec index(0...): %d",hit));
234 ((*fHitsForRecPtr)[hit])->Dump();
235 }
236 }
237 }
238}
239
8d0843c6 240 //__________________________________________________________________________
241void AliMUONVTrackReconstructor::SortHitsForRecWithIncreasingChamber()
242{
243 /// Sort HitsForRec's in increasing order with respect to chamber number.
244 /// Uses the function "Compare".
245 /// Update the information for HitsForRec per chamber too.
246 Int_t ch, nhits, prevch;
247 fHitsForRecPtr->Sort();
248 for (ch = 0; ch < AliMUONConstants::NTrackingCh(); ch++) {
249 fNHitsForRecPerChamber[ch] = 0;
250 fIndexOfFirstHitForRecPerChamber[ch] = 0;
251 }
252 prevch = 0; // previous chamber
253 nhits = 0; // number of hits in current chamber
254 // Loop over HitsForRec
255 for (Int_t hit = 0; hit < fNHitsForRec; hit++) {
256 // chamber number (0...)
257 ch = ((AliMUONHitForRec*) ((*fHitsForRecPtr)[hit]))->GetChamberNumber();
258 // increment number of hits in current chamber
259 (fNHitsForRecPerChamber[ch])++;
260 // update index of first HitForRec in current chamber
261 // if chamber number different from previous one
262 if (ch != prevch) {
263 fIndexOfFirstHitForRecPerChamber[ch] = hit;
264 prevch = ch;
265 }
266 }
267 return;
268}
269
270 //__________________________________________________________________________
ea94c18b 271void AliMUONVTrackReconstructor::MakeTracks()
272{
273 /// To make the tracks from the list of segments and points in all stations
274 AliDebug(1,"Enter MakeTracks");
275 // Look for candidates from at least 3 aligned points in stations(1..) 4 and 5
276 MakeTrackCandidates();
277 if (fRecTracksPtr->GetEntriesFast() == 0) return;
278 // Follow tracks in stations(1..) 3, 2 and 1
279 FollowTracks();
280 // Improve the reconstructed tracks
281 if (fgkImproveTracks) ImproveTracks();
282 // Remove double tracks
283 RemoveDoubleTracks();
284 // Fill AliMUONTrack data members
285 Finalize();
286}
287
288 //__________________________________________________________________________
208f139e 289TClonesArray* AliMUONVTrackReconstructor::MakeSegmentsInStation(Int_t station)
8d0843c6 290{
208f139e 291 /// To make the list of segments in station(0..) "Station" from the list of hits to be reconstructed.
292 /// Return a new TClonesArray of segments.
293 /// It is the responsibility of the user to delete it afterward.
294 AliDebug(1,Form("Enter MakeSegmentsPerStation (0...) %d",station));
295
8d0843c6 296 AliMUONHitForRec *hit1Ptr, *hit2Ptr;
208f139e 297 AliMUONObjectPair *segment;
22ccc301 298 Double_t bendingSlope = 0, impactParam = 0., bendingMomentum = 0.; // to avoid compilation warning
7ec3b9cf 299 // first and second chambers (0...) in the station
208f139e 300 Int_t ch1 = 2 * station;
8d0843c6 301 Int_t ch2 = ch1 + 1;
7ec3b9cf 302
208f139e 303 // list of segments
304 TClonesArray *segments = new TClonesArray("AliMUONObjectPair", fNHitsForRecPerChamber[ch2]);
7ec3b9cf 305 segments->SetOwner(kTRUE);
306
208f139e 307 // Loop over HitForRec's in the first chamber of the station
8d0843c6 308 for (Int_t hit1 = fIndexOfFirstHitForRecPerChamber[ch1];
309 hit1 < fIndexOfFirstHitForRecPerChamber[ch1] + fNHitsForRecPerChamber[ch1];
7ec3b9cf 310 hit1++)
311 {
8d0843c6 312 // pointer to the HitForRec
313 hit1Ptr = (AliMUONHitForRec*) ((*fHitsForRecPtr)[hit1]);
208f139e 314 // Loop over HitsForRec's in the second chamber of the station
8d0843c6 315 for (Int_t hit2 = fIndexOfFirstHitForRecPerChamber[ch2];
7ec3b9cf 316 hit2 < fIndexOfFirstHitForRecPerChamber[ch2] + fNHitsForRecPerChamber[ch2];
317 hit2++)
318 {
8d0843c6 319 // pointer to the HitForRec
320 hit2Ptr = (AliMUONHitForRec*) ((*fHitsForRecPtr)[hit2]);
7ec3b9cf 321 if ( hit1Ptr->GetZ() - hit2Ptr->GetZ() != 0. )
322 {
22ccc301 323 // bending slope
208f139e 324 bendingSlope = (hit1Ptr->GetBendingCoor() - hit2Ptr->GetBendingCoor()) / (hit1Ptr->GetZ() - hit2Ptr->GetZ());
325 // impact parameter
326 impactParam = hit1Ptr->GetBendingCoor() - hit1Ptr->GetZ() * bendingSlope;
327 // absolute value of bending momentum
7ec3b9cf 328 bendingMomentum = TMath::Abs(AliMUONTrackExtrap::GetBendingMomentumFromImpactParam(impactParam));
329 } else
330 {
208f139e 331 AliWarning("hit1Ptr->GetZ() = hit2Ptr->GetZ(): no segment created");
332 continue;
333 }
22ccc301 334 // check for bending momentum within tolerances
7ec3b9cf 335 if ((bendingMomentum < fMaxBendingMomentum) && (bendingMomentum > fMinBendingMomentum))
336 {
337 // make new segment
338 segment = new ((*segments)[segments->GetLast()+1]) AliMUONObjectPair(hit1Ptr, hit2Ptr, kFALSE, kFALSE);
339 if (AliLog::GetGlobalDebugLevel() > 1) {
340 cout << "segmentIndex(0...): " << segments->GetLast() << endl;
341 segment->Dump();
342 cout << "HitForRec in first chamber" << endl;
343 hit1Ptr->Dump();
344 cout << "HitForRec in second chamber" << endl;
345 hit2Ptr->Dump();
346 }
8d0843c6 347 }
348 } //for (Int_t hit2
349 } // for (Int_t hit1...
208f139e 350 AliDebug(1,Form("Station: %d NSegments: %d ", station, segments->GetEntriesFast()));
351 return segments;
8d0843c6 352}
353
ea94c18b 354 //__________________________________________________________________________
355void AliMUONVTrackReconstructor::RemoveIdenticalTracks()
356{
357 /// To remove identical tracks:
358 /// Tracks are considered identical if they have all their hits in common.
359 /// One keeps the track with the larger number of hits if need be
360 AliMUONTrack *track1, *track2, *trackToRemove;
361 Int_t hitsInCommon, nHits1, nHits2;
362 Bool_t removedTrack1;
363 // Loop over first track of the pair
364 track1 = (AliMUONTrack*) fRecTracksPtr->First();
365 while (track1) {
366 removedTrack1 = kFALSE;
367 nHits1 = track1->GetNTrackHits();
368 // Loop over second track of the pair
369 track2 = (AliMUONTrack*) fRecTracksPtr->After(track1);
370 while (track2) {
371 nHits2 = track2->GetNTrackHits();
372 // number of hits in common between two tracks
373 hitsInCommon = track1->HitsInCommon(track2);
374 // check for identical tracks
375 if ((hitsInCommon == nHits1) || (hitsInCommon == nHits2)) {
376 // decide which track to remove
377 if (nHits2 > nHits1) {
378 // remove track1 and continue the first loop with the track next to track1
379 trackToRemove = track1;
380 track1 = (AliMUONTrack*) fRecTracksPtr->After(track1);
381 fRecTracksPtr->Remove(trackToRemove);
382 fRecTracksPtr->Compress(); // this is essential to retrieve the TClonesArray afterwards
383 fNRecTracks--;
384 removedTrack1 = kTRUE;
385 break;
386 } else {
387 // remove track2 and continue the second loop with the track next to track2
388 trackToRemove = track2;
389 track2 = (AliMUONTrack*) fRecTracksPtr->After(track2);
390 fRecTracksPtr->Remove(trackToRemove);
391 fRecTracksPtr->Compress(); // this is essential to retrieve the TClonesArray afterwards
392 fNRecTracks--;
393 }
394 } else track2 = (AliMUONTrack*) fRecTracksPtr->After(track2);
395 } // track2
396 if (removedTrack1) continue;
397 track1 = (AliMUONTrack*) fRecTracksPtr->After(track1);
398 } // track1
399 return;
400}
401
402 //__________________________________________________________________________
403void AliMUONVTrackReconstructor::RemoveDoubleTracks()
404{
405 /// To remove double tracks:
406 /// Tracks are considered identical if more than half of the hits of the track
407 /// which has the smaller number of hits are in common with the other track.
408 /// Among two identical tracks, one keeps the track with the larger number of hits
409 /// or, if these numbers are equal, the track with the minimum chi2.
410 AliMUONTrack *track1, *track2, *trackToRemove;
411 Int_t hitsInCommon, nHits1, nHits2;
412 Bool_t removedTrack1;
413 // Loop over first track of the pair
414 track1 = (AliMUONTrack*) fRecTracksPtr->First();
415 while (track1) {
416 removedTrack1 = kFALSE;
417 nHits1 = track1->GetNTrackHits();
418 // Loop over second track of the pair
419 track2 = (AliMUONTrack*) fRecTracksPtr->After(track1);
420 while (track2) {
421 nHits2 = track2->GetNTrackHits();
422 // number of hits in common between two tracks
423 hitsInCommon = track1->HitsInCommon(track2);
424 // check for identical tracks
425 if (((nHits1 < nHits2) && (2 * hitsInCommon > nHits1)) || (2 * hitsInCommon > nHits2)) {
426 // decide which track to remove
427 if ((nHits1 > nHits2) || ((nHits1 == nHits2) && (track1->GetFitFMin() <= track2->GetFitFMin()))) {
428 // remove track2 and continue the second loop with the track next to track2
429 trackToRemove = track2;
430 track2 = (AliMUONTrack*) fRecTracksPtr->After(track2);
431 fRecTracksPtr->Remove(trackToRemove);
432 fRecTracksPtr->Compress(); // this is essential to retrieve the TClonesArray afterwards
433 fNRecTracks--;
434 } else {
435 // else remove track1 and continue the first loop with the track next to track1
436 trackToRemove = track1;
437 track1 = (AliMUONTrack*) fRecTracksPtr->After(track1);
438 fRecTracksPtr->Remove(trackToRemove);
439 fRecTracksPtr->Compress(); // this is essential to retrieve the TClonesArray afterwards
440 fNRecTracks--;
441 removedTrack1 = kTRUE;
442 break;
443 }
444 } else track2 = (AliMUONTrack*) fRecTracksPtr->After(track2);
445 } // track2
446 if (removedTrack1) continue;
447 track1 = (AliMUONTrack*) fRecTracksPtr->After(track1);
448 } // track1
449 return;
450}
451
452 //__________________________________________________________________________
453Double_t AliMUONVTrackReconstructor::TryOneHitForRec(const AliMUONTrackParam &trackParam, AliMUONHitForRec* hitForRec,
454 AliMUONTrackParam &trackParamAtHit, Bool_t updatePropagator)
455{
456/// Test the compatibility between the track and the hitForRec (using trackParam's covariance matrix):
457/// return the corresponding Chi2
458/// return trackParamAtHit
459
ea94c18b 460 // extrapolate track parameters and covariances at the z position of the tested hit
019df241 461 trackParamAtHit = trackParam;
462 AliMUONTrackExtrap::ExtrapToZCov(&trackParamAtHit, hitForRec->GetZ(), updatePropagator);
ea94c18b 463
464 // set pointer to hit into trackParamAtHit
465 trackParamAtHit.SetHitForRecPtr(hitForRec);
466
467 // Set differences between trackParam and hitForRec in the bending and non bending directions
019df241 468 Double_t dX = hitForRec->GetNonBendingCoor() - trackParamAtHit.GetNonBendingCoor();
469 Double_t dY = hitForRec->GetBendingCoor() - trackParamAtHit.GetBendingCoor();
ea94c18b 470
019df241 471 // Calculate errors and covariances
ea94c18b 472 const TMatrixD& kParamCov = trackParamAtHit.GetCovariances();
019df241 473 Double_t sigma2X = kParamCov(0,0) + hitForRec->GetNonBendingReso2();
474 Double_t sigma2Y = kParamCov(2,2) + hitForRec->GetBendingReso2();
475
476 // Compute chi2
477 return dX * dX / sigma2X + dY * dY / sigma2Y;
478
479}
480
481 //__________________________________________________________________________
482Bool_t AliMUONVTrackReconstructor::TryOneHitForRecFast(const AliMUONTrackParam &trackParam, AliMUONHitForRec* hitForRec)
483{
484/// Test the compatibility between the track and the hitForRec within a wide fix window
485/// assuming linear propagation of the track:
486/// return kTRUE if they are compatibles
487
488 Double_t dZ = hitForRec->GetZ() - trackParam.GetZ();
489 Double_t dX = hitForRec->GetNonBendingCoor() - (trackParam.GetNonBendingCoor() + trackParam.GetNonBendingSlope() * dZ);
490 Double_t dY = hitForRec->GetBendingCoor() - (trackParam.GetBendingCoor() + trackParam.GetBendingSlope() * dZ);
491
492 if (TMath::Abs(dX) > fgkMaxTrackingDistanceNonBending || TMath::Abs(dY) > fgkMaxTrackingDistanceBending) return kFALSE;
493
494 return kTRUE;
495
496}
497
498 //__________________________________________________________________________
499Double_t AliMUONVTrackReconstructor::TryTwoHitForRecFast(const AliMUONTrackParam &trackParamAtHit1, AliMUONHitForRec* hitForRec2,
500 AliMUONTrackParam &trackParamAtHit2)
501{
502/// Test the compatibility between the track and the 2 hitForRec together (using trackParam's covariance matrix)
503/// assuming linear propagation between the two hits:
504/// return the corresponding Chi2 accounting for covariances between the 2 hitForRec
505/// return trackParamAtHit1 & 2
506
507 // extrapolate linearly track parameters at the z position of the second hit
508 trackParamAtHit2 = trackParamAtHit1;
509 AliMUONTrackExtrap::LinearExtrapToZ(&trackParamAtHit2, hitForRec2->GetZ());
510
511 // set pointer to hit2 into trackParamAtHit2
512 trackParamAtHit2.SetHitForRecPtr(hitForRec2);
513
514 // Set differences between track and hitForRec in the bending and non bending directions
515 AliMUONHitForRec* hitForRec1 = trackParamAtHit1.GetHitForRecPtr();
516 Double_t dX1 = hitForRec1->GetNonBendingCoor() - trackParamAtHit1.GetNonBendingCoor();
517 Double_t dX2 = hitForRec2->GetNonBendingCoor() - trackParamAtHit2.GetNonBendingCoor();
518 Double_t dY1 = hitForRec1->GetBendingCoor() - trackParamAtHit1.GetBendingCoor();
519 Double_t dY2 = hitForRec2->GetBendingCoor() - trackParamAtHit2.GetBendingCoor();
520
521 // Calculate errors and covariances
522 const TMatrixD& kParamCov1 = trackParamAtHit1.GetCovariances();
523 const TMatrixD& kParamCov2 = trackParamAtHit2.GetCovariances();
524 Double_t dZ = trackParamAtHit2.GetZ() - trackParamAtHit1.GetZ();
525 Double_t sigma2X1 = kParamCov1(0,0) + hitForRec1->GetNonBendingReso2();
526 Double_t sigma2X2 = kParamCov2(0,0) + hitForRec2->GetNonBendingReso2();
527 Double_t covX1X2 = kParamCov1(0,0) + dZ * kParamCov1(0,1);
528 Double_t sigma2Y1 = kParamCov1(2,2) + hitForRec1->GetBendingReso2();
529 Double_t sigma2Y2 = kParamCov2(2,2) + hitForRec2->GetBendingReso2();
530 Double_t covY1Y2 = kParamCov1(2,2) + dZ * kParamCov1(2,3);
531
532 // Compute chi2
533 Double_t detX = sigma2X1 * sigma2X2 - covX1X2 * covX1X2;
534 Double_t detY = sigma2Y1 * sigma2Y2 - covY1Y2 * covY1Y2;
535 if (detX == 0. || detY == 0.) return 1.e10;
536 return (dX1 * dX1 * sigma2X2 + dX2 * dX2 * sigma2X1 - 2. * dX1 * dX2 * covX1X2) / detX
537 + (dY1 * dY1 * sigma2Y2 + dY2 * dY2 * sigma2Y1 - 2. * dY1 * dY2 * covY1Y2) / detY;
538
539}
540
541 //__________________________________________________________________________
542Bool_t AliMUONVTrackReconstructor::FollowLinearTrackInStation(AliMUONTrack &trackCandidate, Int_t nextStation)
543{
544 /// Follow trackCandidate in station(0..) nextStation assuming linear propagation, and search for compatible HitForRec(s)
545 /// Keep all possibilities or only the best one(s) according to the flag fgkTrackAllTracks:
546 /// kTRUE: duplicate "trackCandidate" if there are several possibilities and add the new tracks at the end of
547 /// fRecTracksPtr to avoid conficts with other track candidates at this current stage of the tracking procedure.
548 /// Remove the obsolete "trackCandidate" at the end.
549 /// kFALSE: add only the best hit(s) to the "trackCandidate". Try to add a couple of hits in priority.
550 /// return kTRUE if new hits have been found (otherwise return kFALSE)
551 AliDebug(1,Form("Enter FollowLinearTrackInStation(1..) %d", nextStation+1));
552
553 // Order the chamber according to the propagation direction (tracking starts with chamber 2):
554 // - nextStation == station(1...) 5 => forward propagation
555 // - nextStation < station(1...) 5 => backward propagation
556 Int_t ch1, ch2;
557 if (nextStation==4) {
558 ch1 = 2*nextStation+1;
559 ch2 = 2*nextStation;
ea94c18b 560 } else {
019df241 561 ch1 = 2*nextStation;
562 ch2 = 2*nextStation+1;
ea94c18b 563 }
564
019df241 565 Double_t chi2WithOneHitForRec = 1.e10;
566 Double_t chi2WithTwoHitForRec = 1.e10;
567 Double_t maxChi2WithOneHitForRec = 2. * fgkSigmaToCutForTracking * fgkSigmaToCutForTracking; // 2 because 2 quantities in chi2
568 Double_t maxChi2WithTwoHitForRec = 4. * fgkSigmaToCutForTracking * fgkSigmaToCutForTracking; // 4 because 4 quantities in chi2
569 Double_t bestChi2WithOneHitForRec = maxChi2WithOneHitForRec;
570 Double_t bestChi2WithTwoHitForRec = maxChi2WithTwoHitForRec;
571 Bool_t foundOneHit = kFALSE;
572 Bool_t foundTwoHits = kFALSE;
573 AliMUONTrack *newTrack = 0x0;
574 AliMUONHitForRec *hitForRecCh1, *hitForRecCh2;
575 AliMUONTrackParam extrapTrackParamAtHit1;
576 AliMUONTrackParam extrapTrackParamAtHit2;
577 AliMUONTrackParam bestTrackParamAtHit1;
578 AliMUONTrackParam bestTrackParamAtHit2;
579 Bool_t *hitForRecCh1Used = new Bool_t[fNHitsForRecPerChamber[ch1]];
580 for (Int_t hit1 = 0; hit1 < fNHitsForRecPerChamber[ch1]; hit1++) hitForRecCh1Used[hit1] = kFALSE;
581
582 // Get track parameters
583 AliMUONTrackParam trackParam(*(AliMUONTrackParam*)trackCandidate.GetTrackParamAtHit()->First());
584
585 // Add MCS effect
586 AliMUONTrackExtrap::AddMCSEffect(&trackParam,AliMUONConstants::ChamberThicknessInX0(),1.);
587
588 // Printout for debuging
589 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
590 cout << "FollowLinearTrackInStation: look for hits in chamber(1..): " << ch2+1 << endl;
591 }
592
593 // look for candidates in chamber 2
594 for (Int_t hit2 = 0; hit2 < fNHitsForRecPerChamber[ch2]; hit2++) {
595
596 hitForRecCh2 = (AliMUONHitForRec*) fHitsForRecPtr->UncheckedAt(fIndexOfFirstHitForRecPerChamber[ch2]+hit2);
597
598 // try to add the current hit fast
599 if (!TryOneHitForRecFast(trackParam, hitForRecCh2)) continue;
600
601 // try to add the current hit accuratly
602 extrapTrackParamAtHit2 = trackParam;
603 AliMUONTrackExtrap::LinearExtrapToZ(&extrapTrackParamAtHit2, hitForRecCh2->GetZ());
604 chi2WithOneHitForRec = TryOneHitForRec(extrapTrackParamAtHit2, hitForRecCh2, extrapTrackParamAtHit2);
605
606 // if good chi2 then try to attach a hitForRec in the other chamber too
607 if (chi2WithOneHitForRec < maxChi2WithOneHitForRec) {
608 Bool_t foundSecondHit = kFALSE;
609
610 // Printout for debuging
611 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
612 cout << "FollowLinearTrackInStation: found one hit in chamber(1..): " << ch2+1
613 << " (Chi2 = " << chi2WithOneHitForRec << ")" << endl;
614 cout << " look for second hits in chamber(1..): " << ch1+1 << " ..." << endl;
615 }
616
617 // add MCS effect
618 AliMUONTrackExtrap::AddMCSEffect(&extrapTrackParamAtHit2,AliMUONConstants::ChamberThicknessInX0(),1.);
619
620 for (Int_t hit1 = 0; hit1 < fNHitsForRecPerChamber[ch1]; hit1++) {
621
622 hitForRecCh1 = (AliMUONHitForRec*) fHitsForRecPtr->UncheckedAt(fIndexOfFirstHitForRecPerChamber[ch1]+hit1);
623
624 // try to add the current hit fast
625 if (!TryOneHitForRecFast(extrapTrackParamAtHit2, hitForRecCh1)) continue;
626
627 // try to add the current hit in addition to the one found on the previous chamber
628 chi2WithTwoHitForRec = TryTwoHitForRecFast(extrapTrackParamAtHit2, hitForRecCh1, extrapTrackParamAtHit1);
629
630 // if good chi2 then consider to add the 2 hitForRec to the "trackCandidate"
631 if (chi2WithTwoHitForRec < maxChi2WithTwoHitForRec) {
632 foundSecondHit = kTRUE;
633 foundTwoHits = kTRUE;
634
635 // Printout for debuging
636 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
637 cout << "FollowLinearTrackInStation: found one hit in chamber(1..): " << ch1+1
638 << " (Chi2 = " << chi2WithTwoHitForRec << ")" << endl;
639 }
640
641 if (fgkTrackAllTracks) {
642 // copy trackCandidate into a new track put at the end of fRecTracksPtr and add the new hitForRec's
643 newTrack = new ((*fRecTracksPtr)[fRecTracksPtr->GetLast()+1]) AliMUONTrack(trackCandidate);
644 extrapTrackParamAtHit1.SetRemovable(kTRUE);
645 newTrack->AddTrackParamAtHit(&extrapTrackParamAtHit1,hitForRecCh1);
646 extrapTrackParamAtHit2.SetRemovable(kTRUE);
647 newTrack->AddTrackParamAtHit(&extrapTrackParamAtHit2,hitForRecCh2);
648 newTrack->GetTrackParamAtHit()->Sort();
649 fNRecTracks++;
650
651 // Tag hitForRecCh1 as used
652 hitForRecCh1Used[hit1] = kTRUE;
653
654 // Printout for debuging
655 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
656 cout << "FollowLinearTrackInStation: added two hits in station(1..): " << nextStation+1 << endl;
657 if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump();
658 }
659
660 } else if (chi2WithTwoHitForRec < bestChi2WithTwoHitForRec) {
661 // keep track of the best couple of hits
662 bestChi2WithTwoHitForRec = chi2WithTwoHitForRec;
663 bestTrackParamAtHit1 = extrapTrackParamAtHit1;
664 bestTrackParamAtHit2 = extrapTrackParamAtHit2;
665 }
666
667 }
668
669 }
670
671 // if no hitForRecCh1 found then consider to add hitForRecCh2 only
672 if (!foundSecondHit) {
673 foundOneHit = kTRUE;
674
675 if (fgkTrackAllTracks) {
676 // copy trackCandidate into a new track put at the end of fRecTracksPtr and add the new hitForRec's
677 newTrack = new ((*fRecTracksPtr)[fRecTracksPtr->GetLast()+1]) AliMUONTrack(trackCandidate);
678 extrapTrackParamAtHit2.SetRemovable(kFALSE);
679 newTrack->AddTrackParamAtHit(&extrapTrackParamAtHit2,hitForRecCh2);
680 newTrack->GetTrackParamAtHit()->Sort();
681 fNRecTracks++;
682
683 // Printout for debuging
684 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
685 cout << "FollowLinearTrackInStation: added one hit in chamber(1..): " << ch2+1 << endl;
686 if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump();
687 }
688
689 } else if (!foundTwoHits && chi2WithOneHitForRec < bestChi2WithOneHitForRec) {
690 // keep track of the best single hitForRec except if a couple of hits has already been found
691 bestChi2WithOneHitForRec = chi2WithOneHitForRec;
692 bestTrackParamAtHit1 = extrapTrackParamAtHit2;
693 }
694
695 }
696
697 }
698
699 }
700
701 // look for candidates in chamber 1 not already attached to a track
702 // if we want to keep all possible tracks or if no good couple of hitForRec has been found
703 if (fgkTrackAllTracks || !foundTwoHits) {
704
705 // Printout for debuging
706 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
707 cout << "FollowLinearTrackInStation: look for single hits in chamber(1..): " << ch1+1 << endl;
708 }
709
710 //Extrapolate trackCandidate to chamber "ch2"
711 AliMUONTrackExtrap::LinearExtrapToZ(&trackParam, AliMUONConstants::DefaultChamberZ(ch2));
712
713 // add MCS effect for next step
714 AliMUONTrackExtrap::AddMCSEffect(&trackParam,AliMUONConstants::ChamberThicknessInX0(),1.);
715
716 for (Int_t hit1 = 0; hit1 < fNHitsForRecPerChamber[ch1]; hit1++) {
717
718 hitForRecCh1 = (AliMUONHitForRec*) fHitsForRecPtr->UncheckedAt(fIndexOfFirstHitForRecPerChamber[ch1]+hit1);
719
720 if (hitForRecCh1Used[hit1]) continue; // Skip hitForRec already used
721
722 // try to add the current hit fast
723 if (!TryOneHitForRecFast(trackParam, hitForRecCh1)) continue;
724
725 // try to add the current hit accuratly
726 extrapTrackParamAtHit1 = trackParam;
727 AliMUONTrackExtrap::LinearExtrapToZ(&extrapTrackParamAtHit1, hitForRecCh1->GetZ());
728 chi2WithOneHitForRec = TryOneHitForRec(extrapTrackParamAtHit1, hitForRecCh1, extrapTrackParamAtHit1);
729
730 // if good chi2 then consider to add hitForRecCh1
731 // We do not try to attach a hitForRec in the other chamber too since it has already been done above
732 if (chi2WithOneHitForRec < maxChi2WithOneHitForRec) {
733 foundOneHit = kTRUE;
734
735 // Printout for debuging
736 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
737 cout << "FollowLinearTrackInStation: found one hit in chamber(1..): " << ch1+1
738 << " (Chi2 = " << chi2WithOneHitForRec << ")" << endl;
739 }
740
741 if (fgkTrackAllTracks) {
742 // copy trackCandidate into a new track put at the end of fRecTracksPtr and add the new hitForRec's
743 newTrack = new ((*fRecTracksPtr)[fRecTracksPtr->GetLast()+1]) AliMUONTrack(trackCandidate);
744 extrapTrackParamAtHit1.SetRemovable(kFALSE);
745 newTrack->AddTrackParamAtHit(&extrapTrackParamAtHit1,hitForRecCh1);
746 newTrack->GetTrackParamAtHit()->Sort();
747 fNRecTracks++;
748
749 // Printout for debuging
750 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
751 cout << "FollowLinearTrackInStation: added one hit in chamber(1..): " << ch1+1 << endl;
752 if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump();
753 }
754
755 } else if (chi2WithOneHitForRec < bestChi2WithOneHitForRec) {
756 // keep track of the best single hitForRec except if a couple of hits has already been found
757 bestChi2WithOneHitForRec = chi2WithOneHitForRec;
758 bestTrackParamAtHit1 = extrapTrackParamAtHit1;
759 }
760
761 }
762
763 }
764
765 }
766
767 // fill out the best track if required else clean up the fRecTracksPtr array
768 if (!fgkTrackAllTracks) {
769 if (foundTwoHits) {
770 bestTrackParamAtHit1.SetRemovable(kTRUE);
771 trackCandidate.AddTrackParamAtHit(&bestTrackParamAtHit1,bestTrackParamAtHit1.GetHitForRecPtr());
772 bestTrackParamAtHit2.SetRemovable(kTRUE);
773 trackCandidate.AddTrackParamAtHit(&bestTrackParamAtHit2,bestTrackParamAtHit2.GetHitForRecPtr());
774 trackCandidate.GetTrackParamAtHit()->Sort();
775
776 // Printout for debuging
777 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
778 cout << "FollowLinearTrackInStation: added the two best hits in station(1..): " << nextStation+1 << endl;
779 if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump();
780 }
781
782 } else if (foundOneHit) {
783 bestTrackParamAtHit1.SetRemovable(kFALSE);
784 trackCandidate.AddTrackParamAtHit(&bestTrackParamAtHit1,bestTrackParamAtHit1.GetHitForRecPtr());
785 trackCandidate.GetTrackParamAtHit()->Sort();
786
787 // Printout for debuging
788 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
789 cout << "FollowLinearTrackInStation: added the best hit in chamber(1..): " << bestTrackParamAtHit1.GetHitForRecPtr()->GetChamberNumber()+1 << endl;
790 if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump();
791 }
792
793 } else return kFALSE;
794
795 } else if (foundOneHit || foundTwoHits) {
796
797 // remove obsolete track
798 fRecTracksPtr->Remove(&trackCandidate);
799 fNRecTracks--;
800
801 } else return kFALSE;
ea94c18b 802
019df241 803 return kTRUE;
ea94c18b 804
805}
806
807 //__________________________________________________________________________
7ec3b9cf 808void AliMUONVTrackReconstructor::ValidateTracksWithTrigger(AliMUONVTrackStore& trackStore,
809 const AliMUONVTriggerTrackStore& triggerTrackStore,
810 const AliMUONVTriggerStore& triggerStore,
811 const AliMUONTrackHitPattern& trackHitPattern)
8d0843c6 812{
813 /// Try to match track from tracking system with trigger track
06ca6d7b 814 static const Double_t kDistSigma[3]={1,1,0.02}; // sigma of distributions (trigger-track) X,Y,slopeY
208f139e 815
7771752e 816 Int_t matchTrigger;
7ec3b9cf 817 Int_t loTrgNum(-1);
8d0843c6 818 Double_t distTriggerTrack[3];
208f139e 819 Double_t xTrack, yTrack, ySlopeTrack, chi2MatchTrigger, minChi2MatchTrigger, chi2;
7ec3b9cf 820
821 TIter itTrack(trackStore.CreateIterator());
822 AliMUONTrack* track;
8d0843c6 823
7ec3b9cf 824 while ( ( track = static_cast<AliMUONTrack*>(itTrack()) ) )
825 {
423b32ca 826 matchTrigger = 0;
8d0843c6 827 chi2MatchTrigger = 0.;
c6ba19f7 828 loTrgNum = -1;
7771752e 829 Int_t doubleMatch=-1; // Check if track matches 2 trigger tracks
830 Double_t doubleChi2 = -1.;
7ec3b9cf 831
832 AliMUONTrackParam trackParam(*((AliMUONTrackParam*) (track->GetTrackParamAtHit()->Last())));
37827b29 833 AliMUONTrackExtrap::ExtrapToZ(&trackParam, AliMUONConstants::DefaultChamberZ(10)); // extrap to 1st trigger chamber
8d0843c6 834
835 xTrack = trackParam.GetNonBendingCoor();
836 yTrack = trackParam.GetBendingCoor();
837 ySlopeTrack = trackParam.GetBendingSlope();
208f139e 838 minChi2MatchTrigger = 999.;
7ec3b9cf 839
840 AliMUONTriggerTrack *triggerTrack;
841 TIter itTriggerTrack(triggerTrackStore.CreateIterator());
842 while ( ( triggerTrack = static_cast<AliMUONTriggerTrack*>(itTriggerTrack() ) ) )
843 {
06ca6d7b 844 distTriggerTrack[0] = (triggerTrack->GetX11()-xTrack)/kDistSigma[0];
845 distTriggerTrack[1] = (triggerTrack->GetY11()-yTrack)/kDistSigma[1];
846 distTriggerTrack[2] = (TMath::Tan(triggerTrack->GetThetay())-ySlopeTrack)/kDistSigma[2];
208f139e 847 chi2 = 0.;
848 for (Int_t iVar = 0; iVar < 3; iVar++) chi2 += distTriggerTrack[iVar]*distTriggerTrack[iVar];
849 chi2 /= 3.; // Normalized Chi2: 3 degrees of freedom (X,Y,slopeY)
7ec3b9cf 850 if (chi2 < fMaxNormChi2MatchTrigger)
851 {
852 Bool_t isDoubleTrack = (TMath::Abs(chi2 - minChi2MatchTrigger)<1.);
853 if (chi2 < minChi2MatchTrigger && chi2 < fMaxNormChi2MatchTrigger)
854 {
855 if(isDoubleTrack)
856 {
857 doubleMatch = loTrgNum;
858 doubleChi2 = chi2MatchTrigger;
859 }
860 minChi2MatchTrigger = chi2;
861 chi2MatchTrigger = chi2;
862 loTrgNum = triggerTrack->GetLoTrgNum();
863 AliMUONLocalTrigger* locTrg = triggerStore.FindLocal(loTrgNum);
864 matchTrigger=1;
865 if(locTrg->LoLpt()>0)matchTrigger=2;
866 if(locTrg->LoHpt()>0)matchTrigger=3;
867 }
868 else if(isDoubleTrack)
869 {
870 doubleMatch = triggerTrack->GetLoTrgNum();
871 doubleChi2 = chi2;
872 }
8d0843c6 873 }
8d0843c6 874 }
7ec3b9cf 875 if(doubleMatch>=0)
876 { // If two trigger tracks match, select the one passing more trigger cuts
877 AliDebug(1, Form("Two candidates found: %i and %i",loTrgNum,doubleMatch));
878 AliMUONLocalTrigger* locTrg1 = triggerStore.FindLocal(doubleMatch);
879 if((locTrg1->LoLpt()>0 && matchTrigger<2) || (locTrg1->LoHpt() && matchTrigger<3))
880 {
881 if(locTrg1->LoHpt()>0)matchTrigger=3;
882 else matchTrigger=2;
883 loTrgNum = doubleMatch;
884 chi2MatchTrigger=doubleChi2;
885 }
7771752e 886 }
8d0843c6 887
888 track->SetMatchTrigger(matchTrigger);
c6ba19f7 889 track->SetLoTrgNum(loTrgNum);
8d0843c6 890 track->SetChi2MatchTrigger(chi2MatchTrigger);
7ec3b9cf 891
892 AliMUONLocalTrigger* locTrg = static_cast<AliMUONLocalTrigger*>(triggerStore.FindLocal(loTrgNum));
893
894 if (locTrg)
895 {
896 track->SetLocalTrigger(locTrg->LoCircuit(),
897 locTrg->LoStripX(),
898 locTrg->LoStripY(),
899 locTrg->LoDev(),
900 locTrg->LoLpt(),
901 locTrg->LoHpt());
902 }
903 }
904
905 trackHitPattern.GetHitPattern(trackStore,triggerStore);
8d0843c6 906}
907
ea94c18b 908 //__________________________________________________________________________
909void AliMUONVTrackReconstructor::EventReconstructTrigger(const AliMUONTriggerCircuit& circuit,
910 const AliMUONVTriggerStore& triggerStore,
911 AliMUONVTriggerTrackStore& triggerTrackStore)
8d0843c6 912{
71a2d3aa 913 /// To make the trigger tracks from Local Trigger
7ec3b9cf 914 AliDebug(1, "");
915
916 AliMUONGlobalTrigger* globalTrigger = triggerStore.Global();
e6b25a6e 917
7ec3b9cf 918 UChar_t gloTrigPat = 0;
e6b25a6e 919
7ec3b9cf 920 if (globalTrigger)
921 {
922 gloTrigPat = globalTrigger->GetGlobalResponse();
e6b25a6e 923 }
924
7ec3b9cf 925 TIter next(triggerStore.CreateIterator());
926 AliMUONLocalTrigger* locTrg(0x0);
8d0843c6 927
e6b25a6e 928 Float_t z11 = AliMUONConstants::DefaultChamberZ(10);
929 Float_t z21 = AliMUONConstants::DefaultChamberZ(12);
7cf63da6 930
7ec3b9cf 931 AliMUONTriggerTrack triggerTrack;
932
933 while ( ( locTrg = static_cast<AliMUONLocalTrigger*>(next()) ) )
934 {
935 Bool_t xTrig=kFALSE;
936 Bool_t yTrig=kFALSE;
937
32ab62c9 938 Int_t localBoardId = locTrg->LoCircuit();
7ec3b9cf 939 if ( locTrg->LoSdev()==1 && locTrg->LoDev()==0 &&
940 locTrg->LoStripX()==0) xTrig=kFALSE; // no trigger in X
941 else xTrig=kTRUE; // trigger in X
942 if (locTrg->LoTrigY()==1 &&
943 locTrg->LoStripY()==15 ) yTrig = kFALSE; // no trigger in Y
944 else yTrig = kTRUE; // trigger in Y
945
946 if (xTrig && yTrig)
947 { // make Trigger Track if trigger in X and Y
8b0baca4 948
32ab62c9 949 Float_t y11 = circuit.GetY11Pos(localBoardId, locTrg->LoStripX());
7ec3b9cf 950 // need first to convert deviation to [0-30]
951 // (see AliMUONLocalTriggerBoard::LocalTrigger)
952 Int_t deviation = locTrg->LoDev();
953 Int_t sign = 0;
954 if ( !locTrg->LoSdev() && deviation ) sign=-1;
955 if ( !locTrg->LoSdev() && !deviation ) sign= 0;
956 if ( locTrg->LoSdev() == 1 ) sign=+1;
957 deviation *= sign;
958 deviation += 15;
959 Int_t stripX21 = locTrg->LoStripX()+deviation+1;
32ab62c9 960 Float_t y21 = circuit.GetY21Pos(localBoardId, stripX21);
961 Float_t x11 = circuit.GetX11Pos(localBoardId, locTrg->LoStripY());
7ec3b9cf 962
963 AliDebug(1, Form(" MakeTriggerTrack %d %d %d %d %f %f %f \n",locTrg->LoCircuit(),
964 locTrg->LoStripX(),locTrg->LoStripX()+locTrg->LoDev()+1,locTrg->LoStripY(),y11, y21, x11));
965
966 Float_t thetax = TMath::ATan2( x11 , z11 );
967 Float_t thetay = TMath::ATan2( (y21-y11) , (z21-z11) );
968
969 triggerTrack.SetX11(x11);
970 triggerTrack.SetY11(y11);
971 triggerTrack.SetThetax(thetax);
972 triggerTrack.SetThetay(thetay);
973 triggerTrack.SetGTPattern(gloTrigPat);
32ab62c9 974 triggerTrack.SetLoTrgNum(localBoardId);
7ec3b9cf 975
976 triggerTrackStore.Add(triggerTrack);
977 } // board is fired
e6b25a6e 978 } // end of loop on Local Trigger
8d0843c6 979}
ea94c18b 980