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 /// \class AliMUONVTrackReconstructor
19 ////////////////////////////////////
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 ////////////////////////////////////
34 #include "AliMUONVTrackReconstructor.h"
35 #include "AliMUONData.h"
36 #include "AliMUONConstants.h"
37 #include "AliMUONHitForRec.h"
38 #include "AliMUONObjectPair.h"
39 #include "AliMUONTriggerTrack.h"
40 #include "AliMUONTriggerCircuit.h"
41 #include "AliMUONLocalTrigger.h"
42 #include "AliMUONGlobalTrigger.h"
43 #include "AliMUONTrack.h"
44 #include "AliMUONTrackParam.h"
45 #include "AliMUONTrackExtrap.h"
48 #include "AliTracker.h"
50 #include <Riostream.h>
51 #include <TClonesArray.h>
55 ClassImp(AliMUONVTrackReconstructor) // Class implementation in ROOT context
58 //************* Defaults parameters for reconstruction
59 const Double_t AliMUONVTrackReconstructor::fgkDefaultMinBendingMomentum = 3.0;
60 const Double_t AliMUONVTrackReconstructor::fgkDefaultMaxBendingMomentum = 3000.0;
61 const Double_t AliMUONVTrackReconstructor::fgkDefaultBendingResolution = 0.01;
62 const Double_t AliMUONVTrackReconstructor::fgkDefaultNonBendingResolution = 0.144;
63 const Double_t AliMUONVTrackReconstructor::fgkDefaultBendingVertexDispersion = 10.;
64 const Double_t AliMUONVTrackReconstructor::fgkDefaultNonBendingVertexDispersion = 10.;
65 const Double_t AliMUONVTrackReconstructor::fgkDefaultMaxNormChi2MatchTrigger = 16.0;
67 //__________________________________________________________________________
68 AliMUONVTrackReconstructor::AliMUONVTrackReconstructor(AliMUONData* data)
70 fMinBendingMomentum(fgkDefaultMinBendingMomentum),
71 fMaxBendingMomentum(fgkDefaultMaxBendingMomentum),
72 fBendingResolution(fgkDefaultBendingResolution),
73 fNonBendingResolution(fgkDefaultNonBendingResolution),
74 fBendingVertexDispersion(fgkDefaultBendingVertexDispersion),
75 fNonBendingVertexDispersion(fgkDefaultNonBendingVertexDispersion),
76 fMaxNormChi2MatchTrigger(fgkDefaultMaxNormChi2MatchTrigger),
79 fNHitsForRecPerChamber(0x0),
80 fIndexOfFirstHitForRecPerChamber(0x0),
84 fTriggerTrack(new AliMUONTriggerTrack()),
87 /// Constructor for class AliMUONVTrackReconstructor
88 fNHitsForRecPerChamber = new Int_t[AliMUONConstants::NTrackingCh()];
89 fIndexOfFirstHitForRecPerChamber = new Int_t[AliMUONConstants::NTrackingCh()];
91 // Memory allocation for the TClonesArray of hits for reconstruction
92 // Is 10000 the right size ????
93 fHitsForRecPtr = new TClonesArray("AliMUONHitForRec", 10000);
95 // set the magnetic field for track extrapolations
96 const AliMagF* kField = AliTracker::GetFieldMap();
97 if (!kField) AliFatal("No field available");
98 AliMUONTrackExtrap::SetField(kField);
101 //__________________________________________________________________________
102 AliMUONVTrackReconstructor::~AliMUONVTrackReconstructor(void)
104 /// Destructor for class AliMUONVTrackReconstructor
105 delete [] fNHitsForRecPerChamber;
106 delete [] fIndexOfFirstHitForRecPerChamber;
107 delete fTriggerTrack;
108 delete fHitsForRecPtr;
111 //__________________________________________________________________________
112 void AliMUONVTrackReconstructor::EventReconstruct(void)
114 /// To reconstruct one event
115 AliDebug(1,"Enter EventReconstruct");
118 ResetHitsForRec(); //AZ
119 AddHitsForRecFromRawClusters();
121 if (fMUONData->IsTriggerTrackBranchesInTree())
122 ValidateTracksWithTrigger();
124 // Add tracks to MUON data container
125 for(Int_t i=0; i<fNRecTracks; i++) {
126 AliMUONTrack * track = (AliMUONTrack*) fRecTracksPtr->At(i);
127 fMUONData->AddRecTrack(*track);
131 //__________________________________________________________________________
132 void AliMUONVTrackReconstructor::ResetTracks(void)
134 /// To reset the TClonesArray of reconstructed tracks
135 if (fRecTracksPtr) fRecTracksPtr->Delete();
136 // Delete in order that the Track destructors are called,
137 // hence the space for the TClonesArray of pointers to TrackHit's is freed
142 //__________________________________________________________________________
143 void AliMUONVTrackReconstructor::ResetHitsForRec(void)
145 /// To reset the array and the number of HitsForRec,
146 /// and also the number of HitsForRec
147 /// and the index of the first HitForRec per chamber
148 if (fHitsForRecPtr) fHitsForRecPtr->Delete();
150 for (Int_t ch = 0; ch < AliMUONConstants::NTrackingCh(); ch++)
151 fNHitsForRecPerChamber[ch] = fIndexOfFirstHitForRecPerChamber[ch] = 0;
155 //__________________________________________________________________________
156 void AliMUONVTrackReconstructor::SortHitsForRecWithIncreasingChamber()
158 /// Sort HitsForRec's in increasing order with respect to chamber number.
159 /// Uses the function "Compare".
160 /// Update the information for HitsForRec per chamber too.
161 Int_t ch, nhits, prevch;
162 fHitsForRecPtr->Sort();
163 for (ch = 0; ch < AliMUONConstants::NTrackingCh(); ch++) {
164 fNHitsForRecPerChamber[ch] = 0;
165 fIndexOfFirstHitForRecPerChamber[ch] = 0;
167 prevch = 0; // previous chamber
168 nhits = 0; // number of hits in current chamber
169 // Loop over HitsForRec
170 for (Int_t hit = 0; hit < fNHitsForRec; hit++) {
171 // chamber number (0...)
172 ch = ((AliMUONHitForRec*) ((*fHitsForRecPtr)[hit]))->GetChamberNumber();
173 // increment number of hits in current chamber
174 (fNHitsForRecPerChamber[ch])++;
175 // update index of first HitForRec in current chamber
176 // if chamber number different from previous one
178 fIndexOfFirstHitForRecPerChamber[ch] = hit;
185 //__________________________________________________________________________
186 TClonesArray* AliMUONVTrackReconstructor::MakeSegmentsInStation(Int_t station)
188 /// To make the list of segments in station(0..) "Station" from the list of hits to be reconstructed.
189 /// Return a new TClonesArray of segments.
190 /// It is the responsibility of the user to delete it afterward.
191 AliDebug(1,Form("Enter MakeSegmentsPerStation (0...) %d",station));
193 AliMUONHitForRec *hit1Ptr, *hit2Ptr;
194 AliMUONObjectPair *segment;
195 Double_t bendingSlope = 0, impactParam = 0., bendingMomentum = 0.; // to avoid compilation warning
196 // first and second chambers (0...) in the station
197 Int_t ch1 = 2 * station;
200 TClonesArray *segments = new TClonesArray("AliMUONObjectPair", fNHitsForRecPerChamber[ch2]);
201 // Loop over HitForRec's in the first chamber of the station
202 for (Int_t hit1 = fIndexOfFirstHitForRecPerChamber[ch1];
203 hit1 < fIndexOfFirstHitForRecPerChamber[ch1] + fNHitsForRecPerChamber[ch1];
205 // pointer to the HitForRec
206 hit1Ptr = (AliMUONHitForRec*) ((*fHitsForRecPtr)[hit1]);
207 // Loop over HitsForRec's in the second chamber of the station
208 for (Int_t hit2 = fIndexOfFirstHitForRecPerChamber[ch2];
209 hit2 < fIndexOfFirstHitForRecPerChamber[ch2] + fNHitsForRecPerChamber[ch2];
211 // pointer to the HitForRec
212 hit2Ptr = (AliMUONHitForRec*) ((*fHitsForRecPtr)[hit2]);
213 if ( hit1Ptr->GetZ() - hit2Ptr->GetZ() != 0. ) {
215 bendingSlope = (hit1Ptr->GetBendingCoor() - hit2Ptr->GetBendingCoor()) / (hit1Ptr->GetZ() - hit2Ptr->GetZ());
217 impactParam = hit1Ptr->GetBendingCoor() - hit1Ptr->GetZ() * bendingSlope;
218 // absolute value of bending momentum
219 bendingMomentum = TMath::Abs(AliMUONTrackExtrap::GetBendingMomentumFromImpactParam(impactParam));
221 AliWarning("hit1Ptr->GetZ() = hit2Ptr->GetZ(): no segment created");
224 // check for bending momentum within tolerances
225 if ((bendingMomentum < fMaxBendingMomentum) && (bendingMomentum > fMinBendingMomentum)) {
227 segment = new ((*segments)[segments->GetLast()+1]) AliMUONObjectPair(hit1Ptr, hit2Ptr, kFALSE, kFALSE);
228 if (AliLog::GetGlobalDebugLevel() > 1) {
229 cout << "segmentIndex(0...): " << segments->GetLast() << endl;
231 cout << "HitForRec in first chamber" << endl;
233 cout << "HitForRec in second chamber" << endl;
238 } // for (Int_t hit1...
239 AliDebug(1,Form("Station: %d NSegments: %d ", station, segments->GetEntriesFast()));
243 //__________________________________________________________________________
244 void AliMUONVTrackReconstructor::ValidateTracksWithTrigger(void)
246 /// Try to match track from tracking system with trigger track
247 static const Double_t kDistSigma[3]={1,1,0.02}; // sigma of distributions (trigger-track) X,Y,slopeY
250 AliMUONTrackParam trackParam;
251 AliMUONTriggerTrack *triggerTrack;
253 fMUONData->SetTreeAddress("RL");
254 fMUONData->GetRecTriggerTracks();
255 TClonesArray *recTriggerTracks = fMUONData->RecTriggerTracks();
259 Double_t distTriggerTrack[3];
260 Double_t xTrack, yTrack, ySlopeTrack, chi2MatchTrigger, minChi2MatchTrigger, chi2;
262 track = (AliMUONTrack*) fRecTracksPtr->First();
264 matchTrigger = kFALSE;
265 chi2MatchTrigger = 0.;
268 trackParam = *((AliMUONTrackParam*) (track->GetTrackParamAtHit()->Last()));
269 AliMUONTrackExtrap::ExtrapToZ(&trackParam, AliMUONConstants::DefaultChamberZ(10)); // extrap to 1st trigger chamber
271 xTrack = trackParam.GetNonBendingCoor();
272 yTrack = trackParam.GetBendingCoor();
273 ySlopeTrack = trackParam.GetBendingSlope();
274 minChi2MatchTrigger = 999.;
276 triggerTrack = (AliMUONTriggerTrack*) recTriggerTracks->First();
278 distTriggerTrack[0] = (triggerTrack->GetX11()-xTrack)/kDistSigma[0];
279 distTriggerTrack[1] = (triggerTrack->GetY11()-yTrack)/kDistSigma[1];
280 distTriggerTrack[2] = (TMath::Tan(triggerTrack->GetThetay())-ySlopeTrack)/kDistSigma[2];
282 for (Int_t iVar = 0; iVar < 3; iVar++) chi2 += distTriggerTrack[iVar]*distTriggerTrack[iVar];
283 chi2 /= 3.; // Normalized Chi2: 3 degrees of freedom (X,Y,slopeY)
284 if (chi2 < minChi2MatchTrigger && chi2 < fMaxNormChi2MatchTrigger) {
285 minChi2MatchTrigger = chi2;
286 matchTrigger = kTRUE;
287 chi2MatchTrigger = chi2;
288 loTrgNum=triggerTrack->GetLoTrgNum();
290 triggerTrack = (AliMUONTriggerTrack*) recTriggerTracks->After(triggerTrack);
293 track->SetMatchTrigger(matchTrigger);
294 track->SetLoTrgNum(loTrgNum);
295 track->SetChi2MatchTrigger(chi2MatchTrigger);
296 track = (AliMUONTrack*) fRecTracksPtr->After(track);
302 //__________________________________________________________________________
303 void AliMUONVTrackReconstructor::EventReconstructTrigger(void)
305 /// To reconstruct trigger for one event
306 AliDebug(1,"Enter EventReconstructTrigger");
311 //__________________________________________________________________________
312 Bool_t AliMUONVTrackReconstructor::MakeTriggerTracks(void)
314 // To make the trigger tracks from Local Trigger
315 AliDebug(1, "Enter MakeTriggerTracks");
319 TClonesArray *localTrigger;
320 TClonesArray *globalTrigger;
321 AliMUONLocalTrigger *locTrg;
322 AliMUONGlobalTrigger *gloTrg;
324 treeR = fMUONData->TreeR();
326 AliWarning("TreeR is not loaded");
330 fMUONData->SetTreeAddress("TC");
331 fMUONData->GetTrigger();
333 // global trigger for trigger pattern
335 globalTrigger = fMUONData->GlobalTrigger();
336 gloTrg = (AliMUONGlobalTrigger*)globalTrigger->UncheckedAt(0);
339 gloTrigPat = gloTrg->GetGlobalResponse();
342 // local trigger for tracking
343 localTrigger = fMUONData->LocalTrigger();
344 Int_t nlocals = (Int_t) (localTrigger->GetEntries());
346 Float_t z11 = AliMUONConstants::DefaultChamberZ(10);
347 Float_t z21 = AliMUONConstants::DefaultChamberZ(12);
354 for (Int_t i=0; i<nlocals; i++) { // loop on Local Trigger
355 locTrg = (AliMUONLocalTrigger*)localTrigger->UncheckedAt(i);
357 AliDebug(1, "AliMUONTrackReconstructor::MakeTriggerTrack using NEW trigger \n");
358 AliMUONTriggerCircuit* circuit =
359 (AliMUONTriggerCircuit*)fTriggerCircuit->At(locTrg->LoCircuit()-1); // -1 !!!
361 y11 = circuit->GetY11Pos(locTrg->LoStripX());
362 stripX21 = locTrg->LoStripX()+locTrg->LoDev()+1;
363 y21 = circuit->GetY21Pos(stripX21);
364 x11 = circuit->GetX11Pos(locTrg->LoStripY());
366 AliDebug(1, Form(" MakeTriggerTrack %d %d %d %d %d %f %f %f \n",i,locTrg->LoCircuit(),
367 locTrg->LoStripX(),locTrg->LoStripX()+locTrg->LoDev()+1,locTrg->LoStripY(),y11, y21, x11));
369 Float_t thetax = TMath::ATan2( x11 , z11 );
370 Float_t thetay = TMath::ATan2( (y21-y11) , (z21-z11) );
372 fTriggerTrack->SetX11(x11);
373 fTriggerTrack->SetY11(y11);
374 fTriggerTrack->SetThetax(thetax);
375 fTriggerTrack->SetThetay(thetay);
376 fTriggerTrack->SetGTPattern(gloTrigPat);
377 fTriggerTrack->SetLoTrgNum(i);
379 fMUONData->AddRecTriggerTrack(*fTriggerTrack);
380 } // end of loop on Local Trigger
385 //__________________________________________________________________________
386 void AliMUONVTrackReconstructor::EventDumpTrigger(void)
388 /// Dump reconstructed trigger event
389 /// and the particle parameters
390 AliMUONTriggerTrack *triggertrack ;
391 Int_t nTriggerTracks = fMUONData->RecTriggerTracks()->GetEntriesFast();
393 AliDebug(1, "****** enter EventDumpTrigger ******");
394 AliDebug(1, Form("Number of Reconstructed tracks : %d ", nTriggerTracks));
396 // Loop over reconstructed tracks
397 for (Int_t trackIndex = 0; trackIndex < nTriggerTracks; trackIndex++) {
398 triggertrack = (AliMUONTriggerTrack*)fMUONData->RecTriggerTracks()->At(trackIndex);
399 printf(" trigger track number %i x11=%f y11=%f thetax=%f thetay=%f \n",
401 triggertrack->GetX11(),triggertrack->GetY11(),
402 triggertrack->GetThetax(),triggertrack->GetThetay());