More robust raw-reader for HLT (Artur)
[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)
25/// * a pointer to the array of segments made with these hits inside each station
26/// * a pointer to the array of reconstructed tracks
27///
28/// It contains as methods, among others:
29/// * EventReconstruct to build the muon tracks
30/// * EventReconstructTrigger to build the trigger tracks
31///
dfb547bf 32/// Several options and adjustable parameters are available for both Kalman and Original
33/// tracking algorithms (hard coded for the moment in AliMUONVTrackReconstructor.cxx):
34/// - *fgkSigmaToCutForTracking* : quality cut used to select new clusters to be
35/// attached to the track candidate and to select good tracks.
36/// - *fgkTrackAllTracks* : according to the value of this flag, in case that several
37/// new clusters pass the quality cut, either we consider all the possibilities
38/// (duplicating tracks) or we attach only the best cluster.
39/// - *fgkRecoverTracks* : if this flag is set to 'true', we try to recover the tracks
40/// lost during the tracking by removing the worst of the 2 clusters attached in the
41/// previous station.
42/// - *fgkImproveTracks* : if this flag is set to 'true', we try to improve the quality
43/// of the tracks at the end of the tracking by removing clusters that do not pass
44/// new quality cut (within the limit that we must keep at least one cluster per
45/// the station).
46/// - *fgkSigmaToCutForImprovement* : quality cut used when we try to improve the
47/// quality of the tracks.
48///
c4ee792d 49/// \author Philippe Pillot
50///
8d0843c6 51////////////////////////////////////
52
8d0843c6 53#include "AliMUONVTrackReconstructor.h"
7ec3b9cf 54
8d0843c6 55#include "AliMUONConstants.h"
ea94c18b 56#include "AliMUONRawCluster.h"
8d0843c6 57#include "AliMUONHitForRec.h"
208f139e 58#include "AliMUONObjectPair.h"
8d0843c6 59#include "AliMUONTriggerTrack.h"
e1a10d41 60#include "AliMUONTriggerCircuit.h"
8d0843c6 61#include "AliMUONLocalTrigger.h"
62#include "AliMUONGlobalTrigger.h"
8d0843c6 63#include "AliMUONTrack.h"
37827b29 64#include "AliMUONTrackParam.h"
65#include "AliMUONTrackExtrap.h"
7771752e 66#include "AliMUONTrackHitPattern.h"
7ec3b9cf 67#include "AliMUONVTrackStore.h"
68#include "AliMUONVClusterStore.h"
69#include "AliMUONRawCluster.h"
7ec3b9cf 70#include "AliMUONVTriggerStore.h"
71#include "AliMUONVTriggerTrackStore.h"
ea94c18b 72#include "AliMpDEManager.h"
73
74#include "AliLog.h"
75#include "AliTracker.h"
8d0843c6 76
4889d34c 77#include <TClonesArray.h>
78#include <TMath.h>
ea94c18b 79#include <TMatrixD.h>
80
81#include <Riostream.h>
4889d34c 82
78649106 83/// \cond CLASSIMP
8d0843c6 84ClassImp(AliMUONVTrackReconstructor) // Class implementation in ROOT context
78649106 85/// \endcond
8d0843c6 86
87//************* Defaults parameters for reconstruction
88const Double_t AliMUONVTrackReconstructor::fgkDefaultMinBendingMomentum = 3.0;
89const Double_t AliMUONVTrackReconstructor::fgkDefaultMaxBendingMomentum = 3000.0;
208f139e 90const Double_t AliMUONVTrackReconstructor::fgkDefaultMaxNormChi2MatchTrigger = 16.0;
8d0843c6 91
ea94c18b 92const Double_t AliMUONVTrackReconstructor::fgkSigmaToCutForTracking = 6.0;
93const Double_t AliMUONVTrackReconstructor::fgkSigmaToCutForImprovement = 4.0;
94const Bool_t AliMUONVTrackReconstructor::fgkTrackAllTracks = kTRUE;
95const Double_t AliMUONVTrackReconstructor::fgkMaxTrackingDistanceBending = 2.;
96const Double_t AliMUONVTrackReconstructor::fgkMaxTrackingDistanceNonBending = 2.;
97const Bool_t AliMUONVTrackReconstructor::fgkRecoverTracks = kTRUE;
98const Bool_t AliMUONVTrackReconstructor::fgkImproveTracks = kTRUE;
99
100
101 //__________________________________________________________________________
7ec3b9cf 102AliMUONVTrackReconstructor::AliMUONVTrackReconstructor()
8d0843c6 103 : TObject(),
104 fMinBendingMomentum(fgkDefaultMinBendingMomentum),
105 fMaxBendingMomentum(fgkDefaultMaxBendingMomentum),
208f139e 106 fMaxNormChi2MatchTrigger(fgkDefaultMaxNormChi2MatchTrigger),
8d0843c6 107 fHitsForRecPtr(0x0),
108 fNHitsForRec(0),
109 fNHitsForRecPerChamber(0x0),
110 fIndexOfFirstHitForRecPerChamber(0x0),
8d0843c6 111 fRecTracksPtr(0x0),
7ec3b9cf 112 fNRecTracks(0)
8d0843c6 113{
114 /// Constructor for class AliMUONVTrackReconstructor
8d0843c6 115 fNHitsForRecPerChamber = new Int_t[AliMUONConstants::NTrackingCh()];
116 fIndexOfFirstHitForRecPerChamber = new Int_t[AliMUONConstants::NTrackingCh()];
117
8d0843c6 118 // Memory allocation for the TClonesArray of hits for reconstruction
119 // Is 10000 the right size ????
120 fHitsForRecPtr = new TClonesArray("AliMUONHitForRec", 10000);
ea94c18b 121
122 // Memory allocation for the TClonesArray of reconstructed tracks
123 fRecTracksPtr = new TClonesArray("AliMUONTrack", 10);
7ec3b9cf 124
208f139e 125 // set the magnetic field for track extrapolations
8d0843c6 126 const AliMagF* kField = AliTracker::GetFieldMap();
127 if (!kField) AliFatal("No field available");
37827b29 128 AliMUONTrackExtrap::SetField(kField);
8d0843c6 129}
130
131 //__________________________________________________________________________
ea94c18b 132AliMUONVTrackReconstructor::~AliMUONVTrackReconstructor()
8d0843c6 133{
134 /// Destructor for class AliMUONVTrackReconstructor
8d0843c6 135 delete [] fNHitsForRecPerChamber;
136 delete [] fIndexOfFirstHitForRecPerChamber;
8d0843c6 137 delete fHitsForRecPtr;
ea94c18b 138 delete fRecTracksPtr;
8d0843c6 139}
140
ea94c18b 141 //__________________________________________________________________________
142void AliMUONVTrackReconstructor::ResetHitsForRec()
143{
144 /// To reset the TClonesArray of HitsForRec,
145 /// and the number of HitForRec and the index of the first HitForRec per chamber
146 if (fHitsForRecPtr) fHitsForRecPtr->Clear("C");
147 fNHitsForRec = 0;
148 for (Int_t ch = 0; ch < AliMUONConstants::NTrackingCh(); ch++) {
149 fNHitsForRecPerChamber[ch] = 0;
150 fIndexOfFirstHitForRecPerChamber[ch] = 0;
151 }
152}
153
154 //__________________________________________________________________________
155void AliMUONVTrackReconstructor::ResetTracks()
156{
157 /// To reset the TClonesArray of reconstructed tracks
158 if (fRecTracksPtr) fRecTracksPtr->Clear("C");
159 fNRecTracks = 0;
160 return;
161}
162
163 //__________________________________________________________________________
164void AliMUONVTrackReconstructor::EventReconstruct(const AliMUONVClusterStore& clusterStore, AliMUONVTrackStore& trackStore)
165{
166 /// To reconstruct one event
167 AliDebug(1,"");
168
169 ResetTracks();
170 ResetHitsForRec();
171 AddHitsForRecFromRawClusters(clusterStore);
172 MakeTracks();
173
174 // Add tracks to MUON data container
175 for (Int_t i=0; i<fNRecTracks; ++i)
176 {
177 AliMUONTrack * track = (AliMUONTrack*) fRecTracksPtr->At(i);
178 trackStore.Add(*track);
179 }
180}
181
182 //__________________________________________________________________________
183void AliMUONVTrackReconstructor::AddHitsForRecFromRawClusters(const AliMUONVClusterStore& clusterStore)
7ec3b9cf 184{
185 /// Build internal array of hit for rec from clusterStore
186
187 TIter next(clusterStore.CreateIterator());
188 AliMUONRawCluster* clus(0x0);
189 Int_t iclus(0);
190
191 while ( ( clus = static_cast<AliMUONRawCluster*>(next()) ) )
192 {
193 // new AliMUONHitForRec from raw cluster
194 // and increment number of AliMUONHitForRec's (total and in chamber)
195 AliMUONHitForRec* hitForRec = new ((*fHitsForRecPtr)[fNHitsForRec]) AliMUONHitForRec(clus);
196 fNHitsForRec++;
197 // more information into HitForRec
198 hitForRec->SetBendingReso2(clus->GetErrY() * clus->GetErrY());
199 hitForRec->SetNonBendingReso2(clus->GetErrX() * clus->GetErrX());
200 // original raw cluster
201 Int_t ch = AliMpDEManager::GetChamberId(clus->GetDetElemId());
202 hitForRec->SetChamberNumber(ch);
203 hitForRec->SetHitNumber(iclus);
204 // Z coordinate of the raw cluster (cm)
205 hitForRec->SetZ(clus->GetZ(0));
206 if (AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructor") >= 3) {
207 cout << "Chamber " << ch <<" raw cluster " << iclus << " : " << endl;
208 clus->Print("full");
209 cout << "AliMUONHitForRec number (1...): " << fNHitsForRec << endl;
210 hitForRec->Print("full");
211 }
212 ++iclus;
213 } // end of chamber loop
214
215 SortHitsForRecWithIncreasingChamber();
216
217 AliDebug(1,"End of AddHitsForRecFromRawClusters");
218
219 if (AliLog::GetGlobalDebugLevel() > 0)
220 {
221 AliDebug(1, Form("NHitsForRec: %d",fNHitsForRec));
222 for (Int_t ch = 0; ch < AliMUONConstants::NTrackingCh(); ch++)
223 {
224 AliDebug(1, Form("Chamber(0...): %d",ch));
225 AliDebug(1, Form("NHitsForRec: %d", fNHitsForRecPerChamber[ch]));
226 AliDebug(1, Form("Index(first HitForRec): %d", fIndexOfFirstHitForRecPerChamber[ch]));
227 for (Int_t hit = fIndexOfFirstHitForRecPerChamber[ch];
228 hit < fIndexOfFirstHitForRecPerChamber[ch] + fNHitsForRecPerChamber[ch];
229 hit++) {
230 AliDebug(1, Form("HitForRec index(0...): %d",hit));
231 ((*fHitsForRecPtr)[hit])->Dump();
232 }
233 }
234 }
235}
236
8d0843c6 237 //__________________________________________________________________________
238void AliMUONVTrackReconstructor::SortHitsForRecWithIncreasingChamber()
239{
240 /// Sort HitsForRec's in increasing order with respect to chamber number.
241 /// Uses the function "Compare".
242 /// Update the information for HitsForRec per chamber too.
243 Int_t ch, nhits, prevch;
244 fHitsForRecPtr->Sort();
245 for (ch = 0; ch < AliMUONConstants::NTrackingCh(); ch++) {
246 fNHitsForRecPerChamber[ch] = 0;
247 fIndexOfFirstHitForRecPerChamber[ch] = 0;
248 }
249 prevch = 0; // previous chamber
250 nhits = 0; // number of hits in current chamber
251 // Loop over HitsForRec
252 for (Int_t hit = 0; hit < fNHitsForRec; hit++) {
253 // chamber number (0...)
254 ch = ((AliMUONHitForRec*) ((*fHitsForRecPtr)[hit]))->GetChamberNumber();
255 // increment number of hits in current chamber
256 (fNHitsForRecPerChamber[ch])++;
257 // update index of first HitForRec in current chamber
258 // if chamber number different from previous one
259 if (ch != prevch) {
260 fIndexOfFirstHitForRecPerChamber[ch] = hit;
261 prevch = ch;
262 }
263 }
264 return;
265}
266
267 //__________________________________________________________________________
ea94c18b 268void AliMUONVTrackReconstructor::MakeTracks()
269{
270 /// To make the tracks from the list of segments and points in all stations
271 AliDebug(1,"Enter MakeTracks");
272 // Look for candidates from at least 3 aligned points in stations(1..) 4 and 5
273 MakeTrackCandidates();
274 if (fRecTracksPtr->GetEntriesFast() == 0) return;
275 // Follow tracks in stations(1..) 3, 2 and 1
276 FollowTracks();
277 // Improve the reconstructed tracks
278 if (fgkImproveTracks) ImproveTracks();
279 // Remove double tracks
280 RemoveDoubleTracks();
281 // Fill AliMUONTrack data members
282 Finalize();
283}
284
285 //__________________________________________________________________________
208f139e 286TClonesArray* AliMUONVTrackReconstructor::MakeSegmentsInStation(Int_t station)
8d0843c6 287{
208f139e 288 /// To make the list of segments in station(0..) "Station" from the list of hits to be reconstructed.
289 /// Return a new TClonesArray of segments.
290 /// It is the responsibility of the user to delete it afterward.
291 AliDebug(1,Form("Enter MakeSegmentsPerStation (0...) %d",station));
292
8d0843c6 293 AliMUONHitForRec *hit1Ptr, *hit2Ptr;
208f139e 294 AliMUONObjectPair *segment;
22ccc301 295 Double_t bendingSlope = 0, impactParam = 0., bendingMomentum = 0.; // to avoid compilation warning
7ec3b9cf 296 // first and second chambers (0...) in the station
208f139e 297 Int_t ch1 = 2 * station;
8d0843c6 298 Int_t ch2 = ch1 + 1;
7ec3b9cf 299
208f139e 300 // list of segments
301 TClonesArray *segments = new TClonesArray("AliMUONObjectPair", fNHitsForRecPerChamber[ch2]);
7ec3b9cf 302 segments->SetOwner(kTRUE);
303
208f139e 304 // Loop over HitForRec's in the first chamber of the station
8d0843c6 305 for (Int_t hit1 = fIndexOfFirstHitForRecPerChamber[ch1];
306 hit1 < fIndexOfFirstHitForRecPerChamber[ch1] + fNHitsForRecPerChamber[ch1];
7ec3b9cf 307 hit1++)
308 {
8d0843c6 309 // pointer to the HitForRec
310 hit1Ptr = (AliMUONHitForRec*) ((*fHitsForRecPtr)[hit1]);
208f139e 311 // Loop over HitsForRec's in the second chamber of the station
8d0843c6 312 for (Int_t hit2 = fIndexOfFirstHitForRecPerChamber[ch2];
7ec3b9cf 313 hit2 < fIndexOfFirstHitForRecPerChamber[ch2] + fNHitsForRecPerChamber[ch2];
314 hit2++)
315 {
8d0843c6 316 // pointer to the HitForRec
317 hit2Ptr = (AliMUONHitForRec*) ((*fHitsForRecPtr)[hit2]);
7ec3b9cf 318 if ( hit1Ptr->GetZ() - hit2Ptr->GetZ() != 0. )
319 {
22ccc301 320 // bending slope
208f139e 321 bendingSlope = (hit1Ptr->GetBendingCoor() - hit2Ptr->GetBendingCoor()) / (hit1Ptr->GetZ() - hit2Ptr->GetZ());
322 // impact parameter
323 impactParam = hit1Ptr->GetBendingCoor() - hit1Ptr->GetZ() * bendingSlope;
324 // absolute value of bending momentum
7ec3b9cf 325 bendingMomentum = TMath::Abs(AliMUONTrackExtrap::GetBendingMomentumFromImpactParam(impactParam));
326 } else
327 {
208f139e 328 AliWarning("hit1Ptr->GetZ() = hit2Ptr->GetZ(): no segment created");
329 continue;
330 }
22ccc301 331 // check for bending momentum within tolerances
7ec3b9cf 332 if ((bendingMomentum < fMaxBendingMomentum) && (bendingMomentum > fMinBendingMomentum))
333 {
334 // make new segment
335 segment = new ((*segments)[segments->GetLast()+1]) AliMUONObjectPair(hit1Ptr, hit2Ptr, kFALSE, kFALSE);
336 if (AliLog::GetGlobalDebugLevel() > 1) {
337 cout << "segmentIndex(0...): " << segments->GetLast() << endl;
338 segment->Dump();
339 cout << "HitForRec in first chamber" << endl;
340 hit1Ptr->Dump();
341 cout << "HitForRec in second chamber" << endl;
342 hit2Ptr->Dump();
343 }
8d0843c6 344 }
345 } //for (Int_t hit2
346 } // for (Int_t hit1...
208f139e 347 AliDebug(1,Form("Station: %d NSegments: %d ", station, segments->GetEntriesFast()));
348 return segments;
8d0843c6 349}
350
ea94c18b 351 //__________________________________________________________________________
352void AliMUONVTrackReconstructor::RemoveIdenticalTracks()
353{
354 /// To remove identical tracks:
355 /// Tracks are considered identical if they have all their hits in common.
356 /// One keeps the track with the larger number of hits if need be
357 AliMUONTrack *track1, *track2, *trackToRemove;
358 Int_t hitsInCommon, nHits1, nHits2;
359 Bool_t removedTrack1;
360 // Loop over first track of the pair
361 track1 = (AliMUONTrack*) fRecTracksPtr->First();
362 while (track1) {
363 removedTrack1 = kFALSE;
364 nHits1 = track1->GetNTrackHits();
365 // Loop over second track of the pair
366 track2 = (AliMUONTrack*) fRecTracksPtr->After(track1);
367 while (track2) {
368 nHits2 = track2->GetNTrackHits();
369 // number of hits in common between two tracks
370 hitsInCommon = track1->HitsInCommon(track2);
371 // check for identical tracks
372 if ((hitsInCommon == nHits1) || (hitsInCommon == nHits2)) {
373 // decide which track to remove
374 if (nHits2 > nHits1) {
375 // remove track1 and continue the first loop with the track next to track1
376 trackToRemove = track1;
377 track1 = (AliMUONTrack*) fRecTracksPtr->After(track1);
378 fRecTracksPtr->Remove(trackToRemove);
379 fRecTracksPtr->Compress(); // this is essential to retrieve the TClonesArray afterwards
380 fNRecTracks--;
381 removedTrack1 = kTRUE;
382 break;
383 } else {
384 // remove track2 and continue the second loop with the track next to track2
385 trackToRemove = track2;
386 track2 = (AliMUONTrack*) fRecTracksPtr->After(track2);
387 fRecTracksPtr->Remove(trackToRemove);
388 fRecTracksPtr->Compress(); // this is essential to retrieve the TClonesArray afterwards
389 fNRecTracks--;
390 }
391 } else track2 = (AliMUONTrack*) fRecTracksPtr->After(track2);
392 } // track2
393 if (removedTrack1) continue;
394 track1 = (AliMUONTrack*) fRecTracksPtr->After(track1);
395 } // track1
396 return;
397}
398
399 //__________________________________________________________________________
400void AliMUONVTrackReconstructor::RemoveDoubleTracks()
401{
402 /// To remove double tracks:
403 /// Tracks are considered identical if more than half of the hits of the track
404 /// which has the smaller number of hits are in common with the other track.
405 /// Among two identical tracks, one keeps the track with the larger number of hits
406 /// or, if these numbers are equal, the track with the minimum chi2.
407 AliMUONTrack *track1, *track2, *trackToRemove;
408 Int_t hitsInCommon, nHits1, nHits2;
409 Bool_t removedTrack1;
410 // Loop over first track of the pair
411 track1 = (AliMUONTrack*) fRecTracksPtr->First();
412 while (track1) {
413 removedTrack1 = kFALSE;
414 nHits1 = track1->GetNTrackHits();
415 // Loop over second track of the pair
416 track2 = (AliMUONTrack*) fRecTracksPtr->After(track1);
417 while (track2) {
418 nHits2 = track2->GetNTrackHits();
419 // number of hits in common between two tracks
420 hitsInCommon = track1->HitsInCommon(track2);
421 // check for identical tracks
422 if (((nHits1 < nHits2) && (2 * hitsInCommon > nHits1)) || (2 * hitsInCommon > nHits2)) {
423 // decide which track to remove
424 if ((nHits1 > nHits2) || ((nHits1 == nHits2) && (track1->GetFitFMin() <= track2->GetFitFMin()))) {
425 // remove track2 and continue the second loop with the track next to track2
426 trackToRemove = track2;
427 track2 = (AliMUONTrack*) fRecTracksPtr->After(track2);
428 fRecTracksPtr->Remove(trackToRemove);
429 fRecTracksPtr->Compress(); // this is essential to retrieve the TClonesArray afterwards
430 fNRecTracks--;
431 } else {
432 // else remove track1 and continue the first loop with the track next to track1
433 trackToRemove = track1;
434 track1 = (AliMUONTrack*) fRecTracksPtr->After(track1);
435 fRecTracksPtr->Remove(trackToRemove);
436 fRecTracksPtr->Compress(); // this is essential to retrieve the TClonesArray afterwards
437 fNRecTracks--;
438 removedTrack1 = kTRUE;
439 break;
440 }
441 } else track2 = (AliMUONTrack*) fRecTracksPtr->After(track2);
442 } // track2
443 if (removedTrack1) continue;
444 track1 = (AliMUONTrack*) fRecTracksPtr->After(track1);
445 } // track1
446 return;
447}
448
449 //__________________________________________________________________________
450Double_t AliMUONVTrackReconstructor::TryOneHitForRec(const AliMUONTrackParam &trackParam, AliMUONHitForRec* hitForRec,
451 AliMUONTrackParam &trackParamAtHit, Bool_t updatePropagator)
452{
453/// Test the compatibility between the track and the hitForRec (using trackParam's covariance matrix):
454/// return the corresponding Chi2
455/// return trackParamAtHit
456
457 if (!trackParam.CovariancesExist()) AliWarning(" track parameter covariance matrix does not exist");
458
459 // extrapolate track parameters and covariances at the z position of the tested hit
460 if (&trackParam != &trackParamAtHit) {
461 trackParamAtHit = trackParam;
462 AliMUONTrackExtrap::ExtrapToZCov(&trackParamAtHit, hitForRec->GetZ(), updatePropagator);
463 }
464
465 // set pointer to hit into trackParamAtHit
466 trackParamAtHit.SetHitForRecPtr(hitForRec);
467
468 // Set differences between trackParam and hitForRec in the bending and non bending directions
469 TMatrixD dPos(2,1);
470 dPos(0,0) = hitForRec->GetNonBendingCoor() - trackParamAtHit.GetNonBendingCoor();
471 dPos(1,0) = hitForRec->GetBendingCoor() - trackParamAtHit.GetBendingCoor();
472
473 // quick test of hitForRec compatibility within a wide road of x*y = 10*1 cm2 to save computing time
474 if (TMath::Abs(dPos(0,0)) > fgkMaxTrackingDistanceNonBending ||
475 TMath::Abs(dPos(1,0)) > fgkMaxTrackingDistanceBending) return 1.e10;
476
477 // Set the error matrix from trackParam covariances and hitForRec resolution
478 const TMatrixD& kParamCov = trackParamAtHit.GetCovariances();
479 TMatrixD error(2,2);
480 error(0,0) = kParamCov(0,0) + hitForRec->GetNonBendingReso2();
481 error(0,1) = kParamCov(0,2);
482 error(1,0) = kParamCov(2,0);
483 error(1,1) = kParamCov(2,2) + hitForRec->GetBendingReso2();
484
485 // Invert the error matrix for Chi2 calculation
486 if (error.Determinant() != 0) {
487 error.Invert();
488 } else {
489 AliWarning(" Determinant error=0");
490 return 1.e10;
491 }
492
493 // Compute the Chi2 value
494 TMatrixD tmp(dPos,TMatrixD::kTransposeMult,error);
495 TMatrixD result(tmp,TMatrixD::kMult,dPos);
496
497 return result(0,0);
498
499}
500
501 //__________________________________________________________________________
7ec3b9cf 502void AliMUONVTrackReconstructor::ValidateTracksWithTrigger(AliMUONVTrackStore& trackStore,
503 const AliMUONVTriggerTrackStore& triggerTrackStore,
504 const AliMUONVTriggerStore& triggerStore,
505 const AliMUONTrackHitPattern& trackHitPattern)
8d0843c6 506{
507 /// Try to match track from tracking system with trigger track
06ca6d7b 508 static const Double_t kDistSigma[3]={1,1,0.02}; // sigma of distributions (trigger-track) X,Y,slopeY
208f139e 509
7771752e 510 Int_t matchTrigger;
7ec3b9cf 511 Int_t loTrgNum(-1);
8d0843c6 512 Double_t distTriggerTrack[3];
208f139e 513 Double_t xTrack, yTrack, ySlopeTrack, chi2MatchTrigger, minChi2MatchTrigger, chi2;
7ec3b9cf 514
515 TIter itTrack(trackStore.CreateIterator());
516 AliMUONTrack* track;
8d0843c6 517
7ec3b9cf 518 while ( ( track = static_cast<AliMUONTrack*>(itTrack()) ) )
519 {
423b32ca 520 matchTrigger = 0;
8d0843c6 521 chi2MatchTrigger = 0.;
c6ba19f7 522 loTrgNum = -1;
7771752e 523 Int_t doubleMatch=-1; // Check if track matches 2 trigger tracks
524 Double_t doubleChi2 = -1.;
7ec3b9cf 525
526 AliMUONTrackParam trackParam(*((AliMUONTrackParam*) (track->GetTrackParamAtHit()->Last())));
37827b29 527 AliMUONTrackExtrap::ExtrapToZ(&trackParam, AliMUONConstants::DefaultChamberZ(10)); // extrap to 1st trigger chamber
8d0843c6 528
529 xTrack = trackParam.GetNonBendingCoor();
530 yTrack = trackParam.GetBendingCoor();
531 ySlopeTrack = trackParam.GetBendingSlope();
208f139e 532 minChi2MatchTrigger = 999.;
7ec3b9cf 533
534 AliMUONTriggerTrack *triggerTrack;
535 TIter itTriggerTrack(triggerTrackStore.CreateIterator());
536 while ( ( triggerTrack = static_cast<AliMUONTriggerTrack*>(itTriggerTrack() ) ) )
537 {
06ca6d7b 538 distTriggerTrack[0] = (triggerTrack->GetX11()-xTrack)/kDistSigma[0];
539 distTriggerTrack[1] = (triggerTrack->GetY11()-yTrack)/kDistSigma[1];
540 distTriggerTrack[2] = (TMath::Tan(triggerTrack->GetThetay())-ySlopeTrack)/kDistSigma[2];
208f139e 541 chi2 = 0.;
542 for (Int_t iVar = 0; iVar < 3; iVar++) chi2 += distTriggerTrack[iVar]*distTriggerTrack[iVar];
543 chi2 /= 3.; // Normalized Chi2: 3 degrees of freedom (X,Y,slopeY)
7ec3b9cf 544 if (chi2 < fMaxNormChi2MatchTrigger)
545 {
546 Bool_t isDoubleTrack = (TMath::Abs(chi2 - minChi2MatchTrigger)<1.);
547 if (chi2 < minChi2MatchTrigger && chi2 < fMaxNormChi2MatchTrigger)
548 {
549 if(isDoubleTrack)
550 {
551 doubleMatch = loTrgNum;
552 doubleChi2 = chi2MatchTrigger;
553 }
554 minChi2MatchTrigger = chi2;
555 chi2MatchTrigger = chi2;
556 loTrgNum = triggerTrack->GetLoTrgNum();
557 AliMUONLocalTrigger* locTrg = triggerStore.FindLocal(loTrgNum);
558 matchTrigger=1;
559 if(locTrg->LoLpt()>0)matchTrigger=2;
560 if(locTrg->LoHpt()>0)matchTrigger=3;
561 }
562 else if(isDoubleTrack)
563 {
564 doubleMatch = triggerTrack->GetLoTrgNum();
565 doubleChi2 = chi2;
566 }
8d0843c6 567 }
8d0843c6 568 }
7ec3b9cf 569 if(doubleMatch>=0)
570 { // If two trigger tracks match, select the one passing more trigger cuts
571 AliDebug(1, Form("Two candidates found: %i and %i",loTrgNum,doubleMatch));
572 AliMUONLocalTrigger* locTrg1 = triggerStore.FindLocal(doubleMatch);
573 if((locTrg1->LoLpt()>0 && matchTrigger<2) || (locTrg1->LoHpt() && matchTrigger<3))
574 {
575 if(locTrg1->LoHpt()>0)matchTrigger=3;
576 else matchTrigger=2;
577 loTrgNum = doubleMatch;
578 chi2MatchTrigger=doubleChi2;
579 }
7771752e 580 }
8d0843c6 581
582 track->SetMatchTrigger(matchTrigger);
c6ba19f7 583 track->SetLoTrgNum(loTrgNum);
8d0843c6 584 track->SetChi2MatchTrigger(chi2MatchTrigger);
7ec3b9cf 585
586 AliMUONLocalTrigger* locTrg = static_cast<AliMUONLocalTrigger*>(triggerStore.FindLocal(loTrgNum));
587
588 if (locTrg)
589 {
590 track->SetLocalTrigger(locTrg->LoCircuit(),
591 locTrg->LoStripX(),
592 locTrg->LoStripY(),
593 locTrg->LoDev(),
594 locTrg->LoLpt(),
595 locTrg->LoHpt());
596 }
597 }
598
599 trackHitPattern.GetHitPattern(trackStore,triggerStore);
8d0843c6 600}
601
ea94c18b 602 //__________________________________________________________________________
603void AliMUONVTrackReconstructor::EventReconstructTrigger(const AliMUONTriggerCircuit& circuit,
604 const AliMUONVTriggerStore& triggerStore,
605 AliMUONVTriggerTrackStore& triggerTrackStore)
8d0843c6 606{
71a2d3aa 607 /// To make the trigger tracks from Local Trigger
7ec3b9cf 608 AliDebug(1, "");
609
610 AliMUONGlobalTrigger* globalTrigger = triggerStore.Global();
e6b25a6e 611
7ec3b9cf 612 UChar_t gloTrigPat = 0;
e6b25a6e 613
7ec3b9cf 614 if (globalTrigger)
615 {
616 gloTrigPat = globalTrigger->GetGlobalResponse();
e6b25a6e 617 }
618
7ec3b9cf 619 TIter next(triggerStore.CreateIterator());
620 AliMUONLocalTrigger* locTrg(0x0);
8d0843c6 621
e6b25a6e 622 Float_t z11 = AliMUONConstants::DefaultChamberZ(10);
623 Float_t z21 = AliMUONConstants::DefaultChamberZ(12);
7cf63da6 624
7ec3b9cf 625 AliMUONTriggerTrack triggerTrack;
626
627 while ( ( locTrg = static_cast<AliMUONLocalTrigger*>(next()) ) )
628 {
629 Bool_t xTrig=kFALSE;
630 Bool_t yTrig=kFALSE;
631
32ab62c9 632 Int_t localBoardId = locTrg->LoCircuit();
7ec3b9cf 633 if ( locTrg->LoSdev()==1 && locTrg->LoDev()==0 &&
634 locTrg->LoStripX()==0) xTrig=kFALSE; // no trigger in X
635 else xTrig=kTRUE; // trigger in X
636 if (locTrg->LoTrigY()==1 &&
637 locTrg->LoStripY()==15 ) yTrig = kFALSE; // no trigger in Y
638 else yTrig = kTRUE; // trigger in Y
639
640 if (xTrig && yTrig)
641 { // make Trigger Track if trigger in X and Y
8b0baca4 642
32ab62c9 643 Float_t y11 = circuit.GetY11Pos(localBoardId, locTrg->LoStripX());
7ec3b9cf 644 // need first to convert deviation to [0-30]
645 // (see AliMUONLocalTriggerBoard::LocalTrigger)
646 Int_t deviation = locTrg->LoDev();
647 Int_t sign = 0;
648 if ( !locTrg->LoSdev() && deviation ) sign=-1;
649 if ( !locTrg->LoSdev() && !deviation ) sign= 0;
650 if ( locTrg->LoSdev() == 1 ) sign=+1;
651 deviation *= sign;
652 deviation += 15;
653 Int_t stripX21 = locTrg->LoStripX()+deviation+1;
32ab62c9 654 Float_t y21 = circuit.GetY21Pos(localBoardId, stripX21);
655 Float_t x11 = circuit.GetX11Pos(localBoardId, locTrg->LoStripY());
7ec3b9cf 656
657 AliDebug(1, Form(" MakeTriggerTrack %d %d %d %d %f %f %f \n",locTrg->LoCircuit(),
658 locTrg->LoStripX(),locTrg->LoStripX()+locTrg->LoDev()+1,locTrg->LoStripY(),y11, y21, x11));
659
660 Float_t thetax = TMath::ATan2( x11 , z11 );
661 Float_t thetay = TMath::ATan2( (y21-y11) , (z21-z11) );
662
663 triggerTrack.SetX11(x11);
664 triggerTrack.SetY11(y11);
665 triggerTrack.SetThetax(thetax);
666 triggerTrack.SetThetay(thetay);
667 triggerTrack.SetGTPattern(gloTrigPat);
32ab62c9 668 triggerTrack.SetLoTrgNum(localBoardId);
7ec3b9cf 669
670 triggerTrackStore.Add(triggerTrack);
671 } // board is fired
e6b25a6e 672 } // end of loop on Local Trigger
8d0843c6 673}
ea94c18b 674