1 /**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
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 **************************************************************************/
18 ////////////////////////////////////
20 // Virtual MUON track reconstructor in ALICE (class renamed from AliMUONEventReconstructor)
22 // This class contains as data:
23 // * a pointer to the array of hits to be reconstructed (the event)
24 // * a pointer to the array of segments made with these hits inside each station
25 // * a pointer to the array of reconstructed tracks
27 // It contains as methods, among others:
28 // * EventReconstruct to build the muon tracks
29 // * EventReconstructTrigger to build the trigger tracks
31 ////////////////////////////////////
34 #include <Riostream.h>
37 #include "AliMUONVTrackReconstructor.h"
38 #include "AliMUONData.h"
39 #include "AliMUONConstants.h"
40 #include "AliMUONHitForRec.h"
41 #include "AliMUONTriggerTrack.h"
42 #include "AliMUONTriggerCircuit.h"
43 #include "AliMUONLocalTrigger.h"
44 #include "AliMUONGlobalTrigger.h"
45 #include "AliMUONSegment.h"
46 #include "AliMUONTrack.h"
47 #include "AliMUONTrackParam.h"
48 #include "AliMUONTrackExtrap.h"
51 #include "AliTracker.h"
53 ClassImp(AliMUONVTrackReconstructor) // Class implementation in ROOT context
55 //************* Defaults parameters for reconstruction
56 const Double_t AliMUONVTrackReconstructor::fgkDefaultMinBendingMomentum = 3.0;
57 const Double_t AliMUONVTrackReconstructor::fgkDefaultMaxBendingMomentum = 3000.0;
58 const Double_t AliMUONVTrackReconstructor::fgkDefaultBendingResolution = 0.01;
59 const Double_t AliMUONVTrackReconstructor::fgkDefaultNonBendingResolution = 0.144;
60 const Double_t AliMUONVTrackReconstructor::fgkDefaultMaxSigma2Distance = 16.0;
61 // Simple magnetic field:
62 // Value taken from macro MUONtracking.C: 0.7 T, hence 7 kG
63 // Length and Position from reco_muon.F, with opposite sign:
64 // Length = ZMAGEND-ZCOIL
65 // Position = (ZMAGEND+ZCOIL)/2
66 // to be ajusted differently from real magnetic field ????
67 const Double_t AliMUONVTrackReconstructor::fgkDefaultSimpleBValue = 7.0;
68 const Double_t AliMUONVTrackReconstructor::fgkDefaultSimpleBLength = 428.0;
69 const Double_t AliMUONVTrackReconstructor::fgkDefaultSimpleBPosition = 1019.0;
71 //__________________________________________________________________________
72 AliMUONVTrackReconstructor::AliMUONVTrackReconstructor(AliMUONData* data)
74 fMinBendingMomentum(fgkDefaultMinBendingMomentum),
75 fMaxBendingMomentum(fgkDefaultMaxBendingMomentum),
76 fBendingResolution(fgkDefaultBendingResolution),
77 fNonBendingResolution(fgkDefaultNonBendingResolution),
78 fMaxSigma2Distance(fgkDefaultMaxSigma2Distance),
79 fChamberThicknessInX0(AliMUONConstants::DefaultChamberThicknessInX0()),
80 fSimpleBValue(fgkDefaultSimpleBValue),
81 fSimpleBLength(fgkDefaultSimpleBLength),
82 fSimpleBPosition(fgkDefaultSimpleBPosition),
83 fSegmentMaxDistBending(0x0),
84 fSegmentMaxDistNonBending(0x0),
87 fNHitsForRecPerChamber(0x0),
88 fIndexOfFirstHitForRecPerChamber(0x0),
94 fTriggerTrack(new AliMUONTriggerTrack()),
97 /// Constructor for class AliMUONVTrackReconstructor
98 fSegmentMaxDistBending = new Double_t[AliMUONConstants::NTrackingSt()];
99 fSegmentMaxDistNonBending = new Double_t[AliMUONConstants::NTrackingSt()];
100 fNHitsForRecPerChamber = new Int_t[AliMUONConstants::NTrackingCh()];
101 fIndexOfFirstHitForRecPerChamber = new Int_t[AliMUONConstants::NTrackingCh()];
103 SetReconstructionParametersToDefaults();
105 // Memory allocation for the TClonesArray of hits for reconstruction
106 // Is 10000 the right size ????
107 fHitsForRecPtr = new TClonesArray("AliMUONHitForRec", 10000);
109 // Memory allocation for the TClonesArray's of segments in stations
110 // Is 2000 the right size ????
111 fSegmentsPtr = new TClonesArray*[AliMUONConstants::NTrackingSt()];
112 fNSegments = new Int_t[AliMUONConstants::NTrackingSt()];
113 for (Int_t st = 0; st < AliMUONConstants::NTrackingSt(); st++) {
114 fSegmentsPtr[st] = new TClonesArray("AliMUONSegment", 2000);
115 fNSegments[st] = 0; // really needed or GetEntriesFast sufficient ????
118 const AliMagF* kField = AliTracker::GetFieldMap();
119 if (!kField) AliFatal("No field available");
120 // Sign of fSimpleBValue according to sign of Bx value at (50,50,-950).
122 x[0] = 50.; x[1] = 50.; x[2] = -950.;
125 fSimpleBValue = TMath::Sign(fSimpleBValue,(Double_t) b[0]);
126 fSimpleBPosition = TMath::Sign(fSimpleBPosition,(Double_t) x[2]);
127 // See how to get fSimple(BValue, BLength, BPosition)
128 // automatically calculated from the actual magnetic field ????
130 // set the magnetic field for track extrapolations
131 AliMUONTrackExtrap::SetField(kField);
134 //__________________________________________________________________________
135 AliMUONVTrackReconstructor::~AliMUONVTrackReconstructor(void)
137 /// Destructor for class AliMUONVTrackReconstructor
138 delete [] fSegmentMaxDistBending;
139 delete [] fSegmentMaxDistNonBending;
140 delete [] fNHitsForRecPerChamber;
141 delete [] fIndexOfFirstHitForRecPerChamber;
142 delete fTriggerTrack;
143 delete fHitsForRecPtr;
144 // Correct destruction of everything ????
145 for (Int_t st = 0; st < AliMUONConstants::NTrackingSt(); st++) delete fSegmentsPtr[st];
146 delete [] fSegmentsPtr;
147 delete [] fNSegments;
150 //__________________________________________________________________________
151 void AliMUONVTrackReconstructor::SetReconstructionParametersToDefaults(void)
153 /// Set reconstruction parameters for making segments to default values
154 // Would be much more convenient with a structure (or class) ????
156 // ******** Parameters for making segments
157 // should be parametrized ????
158 // according to interval between chambers in a station ????
159 // Maximum distance in non bending plane
160 // 5 * 0.22 just to remember the way it was made in TRACKF_STAT
162 for (Int_t st = 0; st < AliMUONConstants::NTrackingCh()/2; st++)
163 fSegmentMaxDistNonBending[st] = 5. * 0.22;
164 // Maximum distance in bending plane:
165 // values from TRACKF_STAT, corresponding to (J psi 20cm),
166 // scaled to the real distance between chambers in a station
167 fSegmentMaxDistBending[0] = TMath::Abs( 1.5 *
168 (AliMUONConstants::DefaultChamberZ(1) - AliMUONConstants::DefaultChamberZ(0)) / 20.0);
169 fSegmentMaxDistBending[1] = TMath::Abs( 1.5 *
170 (AliMUONConstants::DefaultChamberZ(3) - AliMUONConstants::DefaultChamberZ(2)) / 20.0);
171 fSegmentMaxDistBending[2] = TMath::Abs( 3.0 *
172 (AliMUONConstants::DefaultChamberZ(5) - AliMUONConstants::DefaultChamberZ(4)) / 20.0);
173 fSegmentMaxDistBending[3] = TMath::Abs( 6.0 *
174 (AliMUONConstants::DefaultChamberZ(7) - AliMUONConstants::DefaultChamberZ(6)) / 20.0);
175 fSegmentMaxDistBending[4] = TMath::Abs( 6.0 *
176 (AliMUONConstants::DefaultChamberZ(9) - AliMUONConstants::DefaultChamberZ(8)) / 20.0);
181 //__________________________________________________________________________
182 void AliMUONVTrackReconstructor::EventReconstruct(void)
184 // To reconstruct one event
185 AliDebug(1,"Enter EventReconstruct");
187 ResetSegments(); //AZ
188 ResetHitsForRec(); //AZ
189 AddHitsForRecFromRawClusters();
192 if (fMUONData->IsTriggerTrackBranchesInTree())
193 ValidateTracksWithTrigger();
195 // Add tracks to MUON data container
196 for(Int_t i=0; i<fNRecTracks; i++) {
197 AliMUONTrack * track = (AliMUONTrack*) fRecTracksPtr->At(i);
198 fMUONData->AddRecTrack(*track);
202 //__________________________________________________________________________
203 void AliMUONVTrackReconstructor::ResetTracks(void)
205 /// To reset the TClonesArray of reconstructed tracks
206 if (fRecTracksPtr) fRecTracksPtr->Delete();
207 // Delete in order that the Track destructors are called,
208 // hence the space for the TClonesArray of pointers to TrackHit's is freed
213 //__________________________________________________________________________
214 void AliMUONVTrackReconstructor::ResetSegments(void)
216 /// To reset the TClonesArray of segments and the number of Segments for all stations
217 for (Int_t st = 0; st < AliMUONConstants::NTrackingCh()/2; st++) {
218 if (fSegmentsPtr[st]) fSegmentsPtr[st]->Clear();
224 //__________________________________________________________________________
225 void AliMUONVTrackReconstructor::ResetHitsForRec(void)
227 /// To reset the array and the number of HitsForRec,
228 /// and also the number of HitsForRec
229 /// and the index of the first HitForRec per chamber
230 if (fHitsForRecPtr) fHitsForRecPtr->Delete();
232 for (Int_t ch = 0; ch < AliMUONConstants::NTrackingCh(); ch++)
233 fNHitsForRecPerChamber[ch] = fIndexOfFirstHitForRecPerChamber[ch] = 0;
237 //__________________________________________________________________________
238 void AliMUONVTrackReconstructor::SortHitsForRecWithIncreasingChamber()
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;
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
260 fIndexOfFirstHitForRecPerChamber[ch] = hit;
267 //__________________________________________________________________________
268 void AliMUONVTrackReconstructor::MakeSegmentsPerStation(Int_t Station)
270 /// To make the list of segments in station number "Station" (0...)
271 /// from the list of hits to be reconstructed.
272 /// Updates "fNSegments"[Station].
273 /// Segments in stations 4 and 5 are sorted
274 /// according to increasing absolute value of "impact parameter"
275 AliMUONHitForRec *hit1Ptr, *hit2Ptr;
276 AliMUONSegment *segment;
278 Double_t bendingSlope, distBend, distNonBend, extBendCoor, extNonBendCoor,
279 impactParam = 0., maxImpactParam = 0., minImpactParam = 0.; // =0 to avoid compilation warnings.
280 AliDebug(1,Form("Enter MakeSegmentsPerStation (0...) %d",Station));
281 // first and second chambers (0...) in the station
282 Int_t ch1 = 2 * Station;
284 // variable true for stations downstream of the dipole:
285 // Station(0..4) equal to 3 or 4
286 if ((Station == 3) || (Station == 4)) {
288 // maximum impact parameter (cm) according to fMinBendingMomentum...
290 TMath::Abs(GetImpactParamFromBendingMomentum(fMinBendingMomentum));
291 // minimum impact parameter (cm) according to fMaxBendingMomentum...
293 TMath::Abs(GetImpactParamFromBendingMomentum(fMaxBendingMomentum));
295 else last2st = kFALSE;
296 // extrapolation factor from Z of first chamber to Z of second chamber
297 // dZ to be changed to take into account fine structure of chambers ????
299 // index for current segment
300 Int_t segmentIndex = 0;
301 // Loop over HitsForRec in the first chamber of the station
302 for (Int_t hit1 = fIndexOfFirstHitForRecPerChamber[ch1];
303 hit1 < fIndexOfFirstHitForRecPerChamber[ch1] + fNHitsForRecPerChamber[ch1];
305 // pointer to the HitForRec
306 hit1Ptr = (AliMUONHitForRec*) ((*fHitsForRecPtr)[hit1]);
308 // on the straight line joining the HitForRec to the vertex (0,0,0),
309 // to the Z of the second chamber of the station
310 // Loop over HitsForRec in the second chamber of the station
311 for (Int_t hit2 = fIndexOfFirstHitForRecPerChamber[ch2];
312 hit2 < fIndexOfFirstHitForRecPerChamber[ch2] + fNHitsForRecPerChamber[ch2];
314 // pointer to the HitForRec
315 hit2Ptr = (AliMUONHitForRec*) ((*fHitsForRecPtr)[hit2]);
316 // absolute values of distances, in bending and non bending planes,
317 // between the HitForRec in the second chamber
318 // and the previous extrapolation
319 extrapFact = hit2Ptr->GetZ()/ hit1Ptr->GetZ();
320 extBendCoor = extrapFact * hit1Ptr->GetBendingCoor();
321 extNonBendCoor = extrapFact * hit1Ptr->GetNonBendingCoor();
322 distBend = TMath::Abs(hit2Ptr->GetBendingCoor() - extBendCoor);
323 distNonBend = TMath::Abs(hit2Ptr->GetNonBendingCoor() - extNonBendCoor);
326 if ( hit1Ptr->GetZ() - hit2Ptr->GetZ() != 0.0 ) {
327 bendingSlope = (hit1Ptr->GetBendingCoor() - hit2Ptr->GetBendingCoor()) /
328 (hit1Ptr->GetZ() - hit2Ptr->GetZ());
329 // absolute value of impact parameter
331 TMath::Abs(hit1Ptr->GetBendingCoor() - hit1Ptr->GetZ() * bendingSlope);
334 AliWarning("hit1Ptr->GetZ() = hit2Ptr->GetZ(): impactParam set to maxImpactParam");
335 impactParam = maxImpactParam;
338 // check for distances not too large,
339 // and impact parameter not too big if stations downstream of the dipole.
340 // Conditions "distBend" and "impactParam" correlated for these stations ????
341 if ((distBend < fSegmentMaxDistBending[Station]) &&
342 (distNonBend < fSegmentMaxDistNonBending[Station]) &&
343 (!last2st || (impactParam < maxImpactParam)) &&
344 (!last2st || (impactParam > minImpactParam))) {
346 segment = new ((*fSegmentsPtr[Station])[segmentIndex])
347 AliMUONSegment(hit1Ptr, hit2Ptr);
348 // update "link" to this segment from the hit in the first chamber
349 if (hit1Ptr->GetNSegments() == 0)
350 hit1Ptr->SetIndexOfFirstSegment(segmentIndex);
351 hit1Ptr->SetNSegments(hit1Ptr->GetNSegments() + 1);
352 if (AliLog::GetGlobalDebugLevel() > 1) {
353 cout << "segmentIndex(0...): " << segmentIndex
354 << " distBend: " << distBend
355 << " distNonBend: " << distNonBend
358 cout << "HitForRec in first chamber" << endl;
360 cout << "HitForRec in second chamber" << endl;
363 // increment index for current segment
367 } // for (Int_t hit1...
368 fNSegments[Station] = segmentIndex;
369 // Sorting according to "impact parameter" if station(1..5) 4 or 5,
370 // i.e. Station(0..4) 3 or 4, using the function "Compare".
371 // After this sorting, it is impossible to use
372 // the "fNSegments" and "fIndexOfFirstSegment"
373 // of the HitForRec in the first chamber to explore all segments formed with it.
374 // Is this sorting really needed ????
375 if ((Station == 3) || (Station == 4)) (fSegmentsPtr[Station])->Sort();
376 AliDebug(1,Form("Station: %d NSegments: %d ", Station, fNSegments[Station]));
380 //__________________________________________________________________________
381 Double_t AliMUONVTrackReconstructor::GetImpactParamFromBendingMomentum(Double_t BendingMomentum) const
383 /// Returns impact parameter at vertex in bending plane (cm),
384 /// from the signed bending momentum "BendingMomentum" in bending plane (GeV/c),
385 /// using simple values for dipole magnetic field.
386 /// The sign of "BendingMomentum" is the sign of the charge.
387 return (-0.0003 * fSimpleBValue * fSimpleBLength * fSimpleBPosition /
391 //__________________________________________________________________________
392 Double_t AliMUONVTrackReconstructor::GetBendingMomentumFromImpactParam(Double_t ImpactParam) const
394 /// Returns signed bending momentum in bending plane (GeV/c),
395 /// the sign being the sign of the charge for particles moving forward in Z,
396 /// from the impact parameter "ImpactParam" at vertex in bending plane (cm),
397 /// using simple values for dipole magnetic field.
398 return (-0.0003 * fSimpleBValue * fSimpleBLength * fSimpleBPosition /
402 //__________________________________________________________________________
403 void AliMUONVTrackReconstructor::ValidateTracksWithTrigger(void)
405 /// Try to match track from tracking system with trigger track
407 AliMUONTrackParam trackParam;
408 AliMUONTriggerTrack *triggerTrack;
410 fMUONData->SetTreeAddress("RL");
411 fMUONData->GetRecTriggerTracks();
412 TClonesArray *recTriggerTracks = fMUONData->RecTriggerTracks();
415 Double_t distSigma[3]={1,1,0.02}; // sigma of distributions (trigger-track) X,Y,slopeY
416 Double_t distTriggerTrack[3];
417 Double_t chi2MatchTrigger, xTrack, yTrack, ySlopeTrack, dTrigTrackMin2, dTrigTrack2 = 0.;
419 track = (AliMUONTrack*) fRecTracksPtr->First();
421 matchTrigger = kFALSE;
422 chi2MatchTrigger = 0.;
424 trackParam = *((AliMUONTrackParam*) (track->GetTrackParamAtHit()->Last()));
425 AliMUONTrackExtrap::ExtrapToZ(&trackParam, AliMUONConstants::DefaultChamberZ(10)); // extrap to 1st trigger chamber
427 xTrack = trackParam.GetNonBendingCoor();
428 yTrack = trackParam.GetBendingCoor();
429 ySlopeTrack = trackParam.GetBendingSlope();
430 dTrigTrackMin2 = 999.;
432 triggerTrack = (AliMUONTriggerTrack*) recTriggerTracks->First();
434 distTriggerTrack[0] = (triggerTrack->GetX11()-xTrack)/distSigma[0];
435 distTriggerTrack[1] = (triggerTrack->GetY11()-yTrack)/distSigma[1];
436 distTriggerTrack[2] = (TMath::Tan(triggerTrack->GetThetay())-ySlopeTrack)/distSigma[2];
438 for (Int_t iVar = 0; iVar < 3; iVar++) dTrigTrack2 += distTriggerTrack[iVar]*distTriggerTrack[iVar];
439 if (dTrigTrack2 < dTrigTrackMin2 && dTrigTrack2 < fMaxSigma2Distance) {
440 dTrigTrackMin2 = dTrigTrack2;
441 matchTrigger = kTRUE;
442 chi2MatchTrigger = dTrigTrack2/3.; // Normalized Chi2, 3 variables (X,Y,slopeY)
444 triggerTrack = (AliMUONTriggerTrack*) recTriggerTracks->After(triggerTrack);
447 track->SetMatchTrigger(matchTrigger);
448 track->SetChi2MatchTrigger(chi2MatchTrigger);
450 track = (AliMUONTrack*) fRecTracksPtr->After(track);
456 //__________________________________________________________________________
457 void AliMUONVTrackReconstructor::EventReconstructTrigger(void)
459 /// To reconstruct trigger for one event
460 AliDebug(1,"Enter EventReconstructTrigger");
465 //__________________________________________________________________________
466 Bool_t AliMUONVTrackReconstructor::MakeTriggerTracks(void)
468 // To make the trigger tracks from Local Trigger
469 AliDebug(1, "Enter MakeTriggerTracks");
474 TClonesArray *localTrigger;
475 TClonesArray *globalTrigger;
476 AliMUONLocalTrigger *locTrg;
477 AliMUONGlobalTrigger *gloTrg;
479 treeR = fMUONData->TreeR();
481 AliWarning("TreeR is not loaded");
485 nTRentries = Int_t(treeR->GetEntries());
487 treeR->GetEvent(0); // only one entry
489 if (!(fMUONData->IsTriggerBranchesInTree())) {
490 AliWarning(Form("Trigger information is not avalaible, nTRentries = %d not equal to 1",nTRentries));
494 fMUONData->SetTreeAddress("TC");
495 fMUONData->GetTrigger();
497 // global trigger for trigger pattern
499 globalTrigger = fMUONData->GlobalTrigger();
500 gloTrg = (AliMUONGlobalTrigger*)globalTrigger->UncheckedAt(0);
503 gloTrigPat = gloTrg->GetGlobalResponse();
506 // local trigger for tracking
507 localTrigger = fMUONData->LocalTrigger();
508 Int_t nlocals = (Int_t) (localTrigger->GetEntries());
510 Float_t z11 = AliMUONConstants::DefaultChamberZ(10);
511 Float_t z21 = AliMUONConstants::DefaultChamberZ(12);
518 for (Int_t i=0; i<nlocals; i++) { // loop on Local Trigger
519 locTrg = (AliMUONLocalTrigger*)localTrigger->UncheckedAt(i);
521 AliDebug(1, "AliMUONTrackReconstructor::MakeTriggerTrack using NEW trigger \n");
522 AliMUONTriggerCircuit* circuit =
523 (AliMUONTriggerCircuit*)fTriggerCircuit->At(locTrg->LoCircuit()-1); // -1 !!!
525 y11 = circuit->GetY11Pos(locTrg->LoStripX());
526 stripX21 = locTrg->LoStripX()+locTrg->LoDev()+1;
527 y21 = circuit->GetY21Pos(stripX21);
528 x11 = circuit->GetX11Pos(locTrg->LoStripY());
530 AliDebug(1, Form(" MakeTriggerTrack %d %d %d %d %d %f %f %f \n",i,locTrg->LoCircuit(),
531 locTrg->LoStripX(),locTrg->LoStripX()+locTrg->LoDev()+1,locTrg->LoStripY(),y11, y21, x11));
533 Float_t thetax = TMath::ATan2( x11 , z11 );
534 Float_t thetay = TMath::ATan2( (y21-y11) , (z21-z11) );
536 fTriggerTrack->SetX11(x11);
537 fTriggerTrack->SetY11(y11);
538 fTriggerTrack->SetThetax(thetax);
539 fTriggerTrack->SetThetay(thetay);
540 fTriggerTrack->SetGTPattern(gloTrigPat);
542 fMUONData->AddRecTriggerTrack(*fTriggerTrack);
543 } // end of loop on Local Trigger
548 //__________________________________________________________________________
549 void AliMUONVTrackReconstructor::EventDumpTrigger(void)
551 /// Dump reconstructed trigger event
552 /// and the particle parameters
553 AliMUONTriggerTrack *triggertrack ;
554 Int_t nTriggerTracks = fMUONData->RecTriggerTracks()->GetEntriesFast();
556 AliDebug(1, "****** enter EventDumpTrigger ******");
557 AliDebug(1, Form("Number of Reconstructed tracks : %d ", nTriggerTracks));
559 // Loop over reconstructed tracks
560 for (Int_t trackIndex = 0; trackIndex < nTriggerTracks; trackIndex++) {
561 triggertrack = (AliMUONTriggerTrack*)fMUONData->RecTriggerTracks()->At(trackIndex);
562 printf(" trigger track number %i x11=%f y11=%f thetax=%f thetay=%f \n",
564 triggertrack->GetX11(),triggertrack->GetY11(),
565 triggertrack->GetThetax(),triggertrack->GetThetay());