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 /// \class AliMUONVTrackReconstructor
21 /// Virtual MUON track reconstructor in ALICE (class renamed from AliMUONEventReconstructor)
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
28 /// It contains as methods, among others:
29 /// * EventReconstruct to build the muon tracks
30 /// * EventReconstructTrigger to build the trigger tracks
32 /// \author Philippe Pillot
34 ////////////////////////////////////
36 #include "AliMUONVTrackReconstructor.h"
37 #include "AliMUONData.h"
38 #include "AliMUONConstants.h"
39 #include "AliMUONHitForRec.h"
40 #include "AliMUONObjectPair.h"
41 #include "AliMUONTriggerTrack.h"
42 #include "AliMUONTriggerCircuit.h"
43 #include "AliMUONLocalTrigger.h"
44 #include "AliMUONGlobalTrigger.h"
45 #include "AliMUONTrack.h"
46 #include "AliMUONTrackParam.h"
47 #include "AliMUONTrackExtrap.h"
50 #include "AliTracker.h"
52 #include <Riostream.h>
53 #include <TClonesArray.h>
57 ClassImp(AliMUONVTrackReconstructor) // Class implementation in ROOT context
60 //************* Defaults parameters for reconstruction
61 const Double_t AliMUONVTrackReconstructor::fgkDefaultMinBendingMomentum = 3.0;
62 const Double_t AliMUONVTrackReconstructor::fgkDefaultMaxBendingMomentum = 3000.0;
63 const Double_t AliMUONVTrackReconstructor::fgkDefaultBendingResolution = 0.01;
64 const Double_t AliMUONVTrackReconstructor::fgkDefaultNonBendingResolution = 0.144;
65 const Double_t AliMUONVTrackReconstructor::fgkDefaultBendingVertexDispersion = 10.;
66 const Double_t AliMUONVTrackReconstructor::fgkDefaultNonBendingVertexDispersion = 10.;
67 const Double_t AliMUONVTrackReconstructor::fgkDefaultMaxNormChi2MatchTrigger = 16.0;
69 //__________________________________________________________________________
70 AliMUONVTrackReconstructor::AliMUONVTrackReconstructor(AliMUONData* data)
72 fMinBendingMomentum(fgkDefaultMinBendingMomentum),
73 fMaxBendingMomentum(fgkDefaultMaxBendingMomentum),
74 fBendingResolution(fgkDefaultBendingResolution),
75 fNonBendingResolution(fgkDefaultNonBendingResolution),
76 fBendingVertexDispersion(fgkDefaultBendingVertexDispersion),
77 fNonBendingVertexDispersion(fgkDefaultNonBendingVertexDispersion),
78 fMaxNormChi2MatchTrigger(fgkDefaultMaxNormChi2MatchTrigger),
81 fNHitsForRecPerChamber(0x0),
82 fIndexOfFirstHitForRecPerChamber(0x0),
86 fTriggerTrack(new AliMUONTriggerTrack()),
89 /// Constructor for class AliMUONVTrackReconstructor
90 fNHitsForRecPerChamber = new Int_t[AliMUONConstants::NTrackingCh()];
91 fIndexOfFirstHitForRecPerChamber = new Int_t[AliMUONConstants::NTrackingCh()];
93 // Memory allocation for the TClonesArray of hits for reconstruction
94 // Is 10000 the right size ????
95 fHitsForRecPtr = new TClonesArray("AliMUONHitForRec", 10000);
97 // set the magnetic field for track extrapolations
98 const AliMagF* kField = AliTracker::GetFieldMap();
99 if (!kField) AliFatal("No field available");
100 AliMUONTrackExtrap::SetField(kField);
103 //__________________________________________________________________________
104 AliMUONVTrackReconstructor::~AliMUONVTrackReconstructor(void)
106 /// Destructor for class AliMUONVTrackReconstructor
107 delete [] fNHitsForRecPerChamber;
108 delete [] fIndexOfFirstHitForRecPerChamber;
109 delete fTriggerTrack;
110 delete fHitsForRecPtr;
113 //__________________________________________________________________________
114 void AliMUONVTrackReconstructor::EventReconstruct(void)
116 /// To reconstruct one event
117 AliDebug(1,"Enter EventReconstruct");
120 ResetHitsForRec(); //AZ
121 AddHitsForRecFromRawClusters();
123 if (fMUONData->IsTriggerTrackBranchesInTree())
124 ValidateTracksWithTrigger();
126 // Add tracks to MUON data container
127 for(Int_t i=0; i<fNRecTracks; i++) {
128 AliMUONTrack * track = (AliMUONTrack*) fRecTracksPtr->At(i);
129 fMUONData->AddRecTrack(*track);
133 //__________________________________________________________________________
134 void AliMUONVTrackReconstructor::ResetTracks(void)
136 /// To reset the TClonesArray of reconstructed tracks
137 if (fRecTracksPtr) fRecTracksPtr->Delete();
138 // Delete in order that the Track destructors are called,
139 // hence the space for the TClonesArray of pointers to TrackHit's is freed
144 //__________________________________________________________________________
145 void AliMUONVTrackReconstructor::ResetHitsForRec(void)
147 /// To reset the array and the number of HitsForRec,
148 /// and also the number of HitsForRec
149 /// and the index of the first HitForRec per chamber
150 if (fHitsForRecPtr) fHitsForRecPtr->Delete();
152 for (Int_t ch = 0; ch < AliMUONConstants::NTrackingCh(); ch++)
153 fNHitsForRecPerChamber[ch] = fIndexOfFirstHitForRecPerChamber[ch] = 0;
157 //__________________________________________________________________________
158 void AliMUONVTrackReconstructor::SortHitsForRecWithIncreasingChamber()
160 /// Sort HitsForRec's in increasing order with respect to chamber number.
161 /// Uses the function "Compare".
162 /// Update the information for HitsForRec per chamber too.
163 Int_t ch, nhits, prevch;
164 fHitsForRecPtr->Sort();
165 for (ch = 0; ch < AliMUONConstants::NTrackingCh(); ch++) {
166 fNHitsForRecPerChamber[ch] = 0;
167 fIndexOfFirstHitForRecPerChamber[ch] = 0;
169 prevch = 0; // previous chamber
170 nhits = 0; // number of hits in current chamber
171 // Loop over HitsForRec
172 for (Int_t hit = 0; hit < fNHitsForRec; hit++) {
173 // chamber number (0...)
174 ch = ((AliMUONHitForRec*) ((*fHitsForRecPtr)[hit]))->GetChamberNumber();
175 // increment number of hits in current chamber
176 (fNHitsForRecPerChamber[ch])++;
177 // update index of first HitForRec in current chamber
178 // if chamber number different from previous one
180 fIndexOfFirstHitForRecPerChamber[ch] = hit;
187 //__________________________________________________________________________
188 TClonesArray* AliMUONVTrackReconstructor::MakeSegmentsInStation(Int_t station)
190 /// To make the list of segments in station(0..) "Station" from the list of hits to be reconstructed.
191 /// Return a new TClonesArray of segments.
192 /// It is the responsibility of the user to delete it afterward.
193 AliDebug(1,Form("Enter MakeSegmentsPerStation (0...) %d",station));
195 AliMUONHitForRec *hit1Ptr, *hit2Ptr;
196 AliMUONObjectPair *segment;
197 Double_t bendingSlope = 0, impactParam = 0., bendingMomentum = 0.; // to avoid compilation warning
198 // first and second chambers (0...) in the station
199 Int_t ch1 = 2 * station;
202 TClonesArray *segments = new TClonesArray("AliMUONObjectPair", fNHitsForRecPerChamber[ch2]);
203 // Loop over HitForRec's in the first chamber of the station
204 for (Int_t hit1 = fIndexOfFirstHitForRecPerChamber[ch1];
205 hit1 < fIndexOfFirstHitForRecPerChamber[ch1] + fNHitsForRecPerChamber[ch1];
207 // pointer to the HitForRec
208 hit1Ptr = (AliMUONHitForRec*) ((*fHitsForRecPtr)[hit1]);
209 // Loop over HitsForRec's in the second chamber of the station
210 for (Int_t hit2 = fIndexOfFirstHitForRecPerChamber[ch2];
211 hit2 < fIndexOfFirstHitForRecPerChamber[ch2] + fNHitsForRecPerChamber[ch2];
213 // pointer to the HitForRec
214 hit2Ptr = (AliMUONHitForRec*) ((*fHitsForRecPtr)[hit2]);
215 if ( hit1Ptr->GetZ() - hit2Ptr->GetZ() != 0. ) {
217 bendingSlope = (hit1Ptr->GetBendingCoor() - hit2Ptr->GetBendingCoor()) / (hit1Ptr->GetZ() - hit2Ptr->GetZ());
219 impactParam = hit1Ptr->GetBendingCoor() - hit1Ptr->GetZ() * bendingSlope;
220 // absolute value of bending momentum
221 bendingMomentum = TMath::Abs(AliMUONTrackExtrap::GetBendingMomentumFromImpactParam(impactParam));
223 AliWarning("hit1Ptr->GetZ() = hit2Ptr->GetZ(): no segment created");
226 // check for bending momentum within tolerances
227 if ((bendingMomentum < fMaxBendingMomentum) && (bendingMomentum > fMinBendingMomentum)) {
229 segment = new ((*segments)[segments->GetLast()+1]) AliMUONObjectPair(hit1Ptr, hit2Ptr, kFALSE, kFALSE);
230 if (AliLog::GetGlobalDebugLevel() > 1) {
231 cout << "segmentIndex(0...): " << segments->GetLast() << endl;
233 cout << "HitForRec in first chamber" << endl;
235 cout << "HitForRec in second chamber" << endl;
240 } // for (Int_t hit1...
241 AliDebug(1,Form("Station: %d NSegments: %d ", station, segments->GetEntriesFast()));
245 //__________________________________________________________________________
246 void AliMUONVTrackReconstructor::ValidateTracksWithTrigger(void)
248 /// Try to match track from tracking system with trigger track
249 static const Double_t kDistSigma[3]={1,1,0.02}; // sigma of distributions (trigger-track) X,Y,slopeY
252 AliMUONTrackParam trackParam;
253 AliMUONTriggerTrack *triggerTrack;
255 fMUONData->SetTreeAddress("RL");
256 fMUONData->GetRecTriggerTracks();
257 TClonesArray *recTriggerTracks = fMUONData->RecTriggerTracks();
261 Double_t distTriggerTrack[3];
262 Double_t xTrack, yTrack, ySlopeTrack, chi2MatchTrigger, minChi2MatchTrigger, chi2;
264 track = (AliMUONTrack*) fRecTracksPtr->First();
266 matchTrigger = kFALSE;
267 chi2MatchTrigger = 0.;
270 trackParam = *((AliMUONTrackParam*) (track->GetTrackParamAtHit()->Last()));
271 AliMUONTrackExtrap::ExtrapToZ(&trackParam, AliMUONConstants::DefaultChamberZ(10)); // extrap to 1st trigger chamber
273 xTrack = trackParam.GetNonBendingCoor();
274 yTrack = trackParam.GetBendingCoor();
275 ySlopeTrack = trackParam.GetBendingSlope();
276 minChi2MatchTrigger = 999.;
278 triggerTrack = (AliMUONTriggerTrack*) recTriggerTracks->First();
280 distTriggerTrack[0] = (triggerTrack->GetX11()-xTrack)/kDistSigma[0];
281 distTriggerTrack[1] = (triggerTrack->GetY11()-yTrack)/kDistSigma[1];
282 distTriggerTrack[2] = (TMath::Tan(triggerTrack->GetThetay())-ySlopeTrack)/kDistSigma[2];
284 for (Int_t iVar = 0; iVar < 3; iVar++) chi2 += distTriggerTrack[iVar]*distTriggerTrack[iVar];
285 chi2 /= 3.; // Normalized Chi2: 3 degrees of freedom (X,Y,slopeY)
286 if (chi2 < minChi2MatchTrigger && chi2 < fMaxNormChi2MatchTrigger) {
287 minChi2MatchTrigger = chi2;
288 matchTrigger = kTRUE;
289 chi2MatchTrigger = chi2;
290 loTrgNum=triggerTrack->GetLoTrgNum();
292 triggerTrack = (AliMUONTriggerTrack*) recTriggerTracks->After(triggerTrack);
295 track->SetMatchTrigger(matchTrigger);
296 track->SetLoTrgNum(loTrgNum);
297 track->SetChi2MatchTrigger(chi2MatchTrigger);
298 track = (AliMUONTrack*) fRecTracksPtr->After(track);
304 //__________________________________________________________________________
305 void AliMUONVTrackReconstructor::EventReconstructTrigger(void)
307 /// To reconstruct trigger for one event
308 AliDebug(1,"Enter EventReconstructTrigger");
313 //__________________________________________________________________________
314 Bool_t AliMUONVTrackReconstructor::MakeTriggerTracks(void)
316 /// To make the trigger tracks from Local Trigger
317 AliDebug(1, "Enter MakeTriggerTracks");
321 TClonesArray *localTrigger;
322 TClonesArray *globalTrigger;
323 AliMUONLocalTrigger *locTrg;
324 AliMUONGlobalTrigger *gloTrg;
326 treeR = fMUONData->TreeR();
328 AliWarning("TreeR is not loaded");
332 fMUONData->SetTreeAddress("TC");
333 fMUONData->GetTrigger();
335 // global trigger for trigger pattern
337 globalTrigger = fMUONData->GlobalTrigger();
338 gloTrg = (AliMUONGlobalTrigger*)globalTrigger->UncheckedAt(0);
341 gloTrigPat = gloTrg->GetGlobalResponse();
344 // local trigger for tracking
345 localTrigger = fMUONData->LocalTrigger();
346 Int_t nlocals = (Int_t) (localTrigger->GetEntries());
348 Float_t z11 = AliMUONConstants::DefaultChamberZ(10);
349 Float_t z21 = AliMUONConstants::DefaultChamberZ(12);
356 for (Int_t i=0; i<nlocals; i++) { // loop on Local Trigger
357 locTrg = (AliMUONLocalTrigger*)localTrigger->UncheckedAt(i);
362 if ( locTrg->LoSdev()==1 && locTrg->LoDev()==0 &&
363 locTrg->LoStripX()==0) xTrig=kFALSE; // no trigger in X
364 else xTrig=kTRUE; // trigger in X
365 if (locTrg->LoTrigY()==1 &&
366 locTrg->LoStripY()==15 ) yTrig = kFALSE; // no trigger in Y
367 else yTrig = kTRUE; // trigger in Y
369 if (xTrig && yTrig) { // make Trigger Track if trigger in X and Y
371 AliDebug(1, "AliMUONTrackReconstructor::MakeTriggerTrack using NEW trigger \n");
372 AliMUONTriggerCircuit* circuit =
373 (AliMUONTriggerCircuit*)fTriggerCircuit->At(locTrg->LoCircuit()-1); // -1 !!!
375 y11 = circuit->GetY11Pos(locTrg->LoStripX());
376 // need first to convert deviation to [0-30]
377 // (see AliMUONLocalTriggerBoard::LocalTrigger)
378 Int_t deviation = locTrg->LoDev();
380 if ( !locTrg->LoSdev() && deviation ) sign=-1;
381 if ( !locTrg->LoSdev() && !deviation ) sign= 0;
382 if ( locTrg->LoSdev() == 1 ) sign=+1;
385 stripX21 = locTrg->LoStripX()+deviation+1;
386 y21 = circuit->GetY21Pos(stripX21);
387 x11 = circuit->GetX11Pos(locTrg->LoStripY());
389 AliDebug(1, Form(" MakeTriggerTrack %d %d %d %d %d %f %f %f \n",i,locTrg->LoCircuit(),
390 locTrg->LoStripX(),locTrg->LoStripX()+locTrg->LoDev()+1,locTrg->LoStripY(),y11, y21, x11));
392 Float_t thetax = TMath::ATan2( x11 , z11 );
393 Float_t thetay = TMath::ATan2( (y21-y11) , (z21-z11) );
395 fTriggerTrack->SetX11(x11);
396 fTriggerTrack->SetY11(y11);
397 fTriggerTrack->SetThetax(thetax);
398 fTriggerTrack->SetThetay(thetay);
399 fTriggerTrack->SetGTPattern(gloTrigPat);
400 fTriggerTrack->SetLoTrgNum(i);
402 fMUONData->AddRecTriggerTrack(*fTriggerTrack);
404 } // end of loop on Local Trigger
409 //__________________________________________________________________________
410 void AliMUONVTrackReconstructor::EventDumpTrigger(void)
412 /// Dump reconstructed trigger event
413 /// and the particle parameters
414 AliMUONTriggerTrack *triggertrack ;
415 Int_t nTriggerTracks = fMUONData->RecTriggerTracks()->GetEntriesFast();
417 AliDebug(1, "****** enter EventDumpTrigger ******");
418 AliDebug(1, Form("Number of Reconstructed tracks : %d ", nTriggerTracks));
420 // Loop over reconstructed tracks
421 for (Int_t trackIndex = 0; trackIndex < nTriggerTracks; trackIndex++) {
422 triggertrack = (AliMUONTriggerTrack*)fMUONData->RecTriggerTracks()->At(trackIndex);
423 printf(" trigger track number %i x11=%f y11=%f thetax=%f thetay=%f \n",
425 triggertrack->GetX11(),triggertrack->GetY11(),
426 triggertrack->GetThetax(),triggertrack->GetThetay());