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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 | ||
06ca6d7b | 18 | /// \class AliMUONVTrackReconstructor |
8d0843c6 | 19 | //////////////////////////////////// |
06ca6d7b | 20 | /// |
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 | /// | |
8d0843c6 | 32 | //////////////////////////////////// |
33 | ||
8d0843c6 | 34 | #include "AliMUONVTrackReconstructor.h" |
35 | #include "AliMUONData.h" | |
36 | #include "AliMUONConstants.h" | |
37 | #include "AliMUONHitForRec.h" | |
208f139e | 38 | #include "AliMUONObjectPair.h" |
8d0843c6 | 39 | #include "AliMUONTriggerTrack.h" |
e1a10d41 | 40 | #include "AliMUONTriggerCircuit.h" |
8d0843c6 | 41 | #include "AliMUONLocalTrigger.h" |
42 | #include "AliMUONGlobalTrigger.h" | |
8d0843c6 | 43 | #include "AliMUONTrack.h" |
37827b29 | 44 | #include "AliMUONTrackParam.h" |
45 | #include "AliMUONTrackExtrap.h" | |
4889d34c | 46 | |
8d0843c6 | 47 | #include "AliLog.h" |
48 | #include "AliTracker.h" | |
49 | ||
4889d34c | 50 | #include <Riostream.h> |
51 | #include <TClonesArray.h> | |
52 | #include <TMath.h> | |
53 | ||
78649106 | 54 | /// \cond CLASSIMP |
8d0843c6 | 55 | ClassImp(AliMUONVTrackReconstructor) // Class implementation in ROOT context |
78649106 | 56 | /// \endcond |
8d0843c6 | 57 | |
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; | |
208f139e | 63 | const Double_t AliMUONVTrackReconstructor::fgkDefaultBendingVertexDispersion = 10.; |
64 | const Double_t AliMUONVTrackReconstructor::fgkDefaultNonBendingVertexDispersion = 10.; | |
65 | const Double_t AliMUONVTrackReconstructor::fgkDefaultMaxNormChi2MatchTrigger = 16.0; | |
8d0843c6 | 66 | |
67 | //__________________________________________________________________________ | |
68 | AliMUONVTrackReconstructor::AliMUONVTrackReconstructor(AliMUONData* data) | |
69 | : TObject(), | |
70 | fMinBendingMomentum(fgkDefaultMinBendingMomentum), | |
71 | fMaxBendingMomentum(fgkDefaultMaxBendingMomentum), | |
72 | fBendingResolution(fgkDefaultBendingResolution), | |
73 | fNonBendingResolution(fgkDefaultNonBendingResolution), | |
208f139e | 74 | fBendingVertexDispersion(fgkDefaultBendingVertexDispersion), |
75 | fNonBendingVertexDispersion(fgkDefaultNonBendingVertexDispersion), | |
76 | fMaxNormChi2MatchTrigger(fgkDefaultMaxNormChi2MatchTrigger), | |
8d0843c6 | 77 | fHitsForRecPtr(0x0), |
78 | fNHitsForRec(0), | |
79 | fNHitsForRecPerChamber(0x0), | |
80 | fIndexOfFirstHitForRecPerChamber(0x0), | |
8d0843c6 | 81 | fRecTracksPtr(0x0), |
82 | fNRecTracks(0), | |
83 | fMUONData(data), | |
84 | fTriggerTrack(new AliMUONTriggerTrack()), | |
85 | fTriggerCircuit(0x0) | |
86 | { | |
87 | /// Constructor for class AliMUONVTrackReconstructor | |
8d0843c6 | 88 | fNHitsForRecPerChamber = new Int_t[AliMUONConstants::NTrackingCh()]; |
89 | fIndexOfFirstHitForRecPerChamber = new Int_t[AliMUONConstants::NTrackingCh()]; | |
90 | ||
8d0843c6 | 91 | // Memory allocation for the TClonesArray of hits for reconstruction |
92 | // Is 10000 the right size ???? | |
93 | fHitsForRecPtr = new TClonesArray("AliMUONHitForRec", 10000); | |
94 | ||
208f139e | 95 | // set the magnetic field for track extrapolations |
8d0843c6 | 96 | const AliMagF* kField = AliTracker::GetFieldMap(); |
97 | if (!kField) AliFatal("No field available"); | |
37827b29 | 98 | AliMUONTrackExtrap::SetField(kField); |
8d0843c6 | 99 | } |
100 | ||
101 | //__________________________________________________________________________ | |
102 | AliMUONVTrackReconstructor::~AliMUONVTrackReconstructor(void) | |
103 | { | |
104 | /// Destructor for class AliMUONVTrackReconstructor | |
8d0843c6 | 105 | delete [] fNHitsForRecPerChamber; |
106 | delete [] fIndexOfFirstHitForRecPerChamber; | |
107 | delete fTriggerTrack; | |
108 | delete fHitsForRecPtr; | |
8d0843c6 | 109 | } |
110 | ||
8d0843c6 | 111 | //__________________________________________________________________________ |
112 | void AliMUONVTrackReconstructor::EventReconstruct(void) | |
113 | { | |
22ccc301 | 114 | /// To reconstruct one event |
8d0843c6 | 115 | AliDebug(1,"Enter EventReconstruct"); |
22ccc301 | 116 | |
8d0843c6 | 117 | ResetTracks(); //AZ |
8d0843c6 | 118 | ResetHitsForRec(); //AZ |
119 | AddHitsForRecFromRawClusters(); | |
8d0843c6 | 120 | MakeTracks(); |
121 | if (fMUONData->IsTriggerTrackBranchesInTree()) | |
122 | ValidateTracksWithTrigger(); | |
123 | ||
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); | |
128 | } | |
129 | } | |
130 | ||
131 | //__________________________________________________________________________ | |
132 | void AliMUONVTrackReconstructor::ResetTracks(void) | |
133 | { | |
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 | |
138 | fNRecTracks = 0; | |
139 | return; | |
140 | } | |
141 | ||
8d0843c6 | 142 | //__________________________________________________________________________ |
143 | void AliMUONVTrackReconstructor::ResetHitsForRec(void) | |
144 | { | |
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(); | |
149 | fNHitsForRec = 0; | |
150 | for (Int_t ch = 0; ch < AliMUONConstants::NTrackingCh(); ch++) | |
151 | fNHitsForRecPerChamber[ch] = fIndexOfFirstHitForRecPerChamber[ch] = 0; | |
152 | return; | |
153 | } | |
154 | ||
155 | //__________________________________________________________________________ | |
156 | void AliMUONVTrackReconstructor::SortHitsForRecWithIncreasingChamber() | |
157 | { | |
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; | |
166 | } | |
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 | |
177 | if (ch != prevch) { | |
178 | fIndexOfFirstHitForRecPerChamber[ch] = hit; | |
179 | prevch = ch; | |
180 | } | |
181 | } | |
182 | return; | |
183 | } | |
184 | ||
185 | //__________________________________________________________________________ | |
208f139e | 186 | TClonesArray* AliMUONVTrackReconstructor::MakeSegmentsInStation(Int_t station) |
8d0843c6 | 187 | { |
208f139e | 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)); | |
192 | ||
8d0843c6 | 193 | AliMUONHitForRec *hit1Ptr, *hit2Ptr; |
208f139e | 194 | AliMUONObjectPair *segment; |
22ccc301 | 195 | Double_t bendingSlope = 0, impactParam = 0., bendingMomentum = 0.; // to avoid compilation warning |
8d0843c6 | 196 | // first and second chambers (0...) in the station |
208f139e | 197 | Int_t ch1 = 2 * station; |
8d0843c6 | 198 | Int_t ch2 = ch1 + 1; |
208f139e | 199 | // list of segments |
200 | TClonesArray *segments = new TClonesArray("AliMUONObjectPair", fNHitsForRecPerChamber[ch2]); | |
201 | // Loop over HitForRec's in the first chamber of the station | |
8d0843c6 | 202 | for (Int_t hit1 = fIndexOfFirstHitForRecPerChamber[ch1]; |
203 | hit1 < fIndexOfFirstHitForRecPerChamber[ch1] + fNHitsForRecPerChamber[ch1]; | |
204 | hit1++) { | |
205 | // pointer to the HitForRec | |
206 | hit1Ptr = (AliMUONHitForRec*) ((*fHitsForRecPtr)[hit1]); | |
208f139e | 207 | // Loop over HitsForRec's in the second chamber of the station |
8d0843c6 | 208 | for (Int_t hit2 = fIndexOfFirstHitForRecPerChamber[ch2]; |
209 | hit2 < fIndexOfFirstHitForRecPerChamber[ch2] + fNHitsForRecPerChamber[ch2]; | |
210 | hit2++) { | |
211 | // pointer to the HitForRec | |
212 | hit2Ptr = (AliMUONHitForRec*) ((*fHitsForRecPtr)[hit2]); | |
208f139e | 213 | if ( hit1Ptr->GetZ() - hit2Ptr->GetZ() != 0. ) { |
22ccc301 | 214 | // bending slope |
208f139e | 215 | bendingSlope = (hit1Ptr->GetBendingCoor() - hit2Ptr->GetBendingCoor()) / (hit1Ptr->GetZ() - hit2Ptr->GetZ()); |
216 | // impact parameter | |
217 | impactParam = hit1Ptr->GetBendingCoor() - hit1Ptr->GetZ() * bendingSlope; | |
218 | // absolute value of bending momentum | |
219 | bendingMomentum = TMath::Abs(AliMUONTrackExtrap::GetBendingMomentumFromImpactParam(impactParam)); | |
220 | } else { | |
221 | AliWarning("hit1Ptr->GetZ() = hit2Ptr->GetZ(): no segment created"); | |
222 | continue; | |
223 | } | |
22ccc301 | 224 | // check for bending momentum within tolerances |
225 | if ((bendingMomentum < fMaxBendingMomentum) && (bendingMomentum > fMinBendingMomentum)) { | |
8d0843c6 | 226 | // make new segment |
208f139e | 227 | segment = new ((*segments)[segments->GetLast()+1]) AliMUONObjectPair(hit1Ptr, hit2Ptr, kFALSE, kFALSE); |
8d0843c6 | 228 | if (AliLog::GetGlobalDebugLevel() > 1) { |
22ccc301 | 229 | cout << "segmentIndex(0...): " << segments->GetLast() << endl; |
8d0843c6 | 230 | segment->Dump(); |
231 | cout << "HitForRec in first chamber" << endl; | |
232 | hit1Ptr->Dump(); | |
233 | cout << "HitForRec in second chamber" << endl; | |
234 | hit2Ptr->Dump(); | |
208f139e | 235 | } |
8d0843c6 | 236 | } |
237 | } //for (Int_t hit2 | |
238 | } // for (Int_t hit1... | |
208f139e | 239 | AliDebug(1,Form("Station: %d NSegments: %d ", station, segments->GetEntriesFast())); |
240 | return segments; | |
8d0843c6 | 241 | } |
242 | ||
243 | //__________________________________________________________________________ | |
244 | void AliMUONVTrackReconstructor::ValidateTracksWithTrigger(void) | |
245 | { | |
246 | /// Try to match track from tracking system with trigger track | |
06ca6d7b | 247 | static const Double_t kDistSigma[3]={1,1,0.02}; // sigma of distributions (trigger-track) X,Y,slopeY |
208f139e | 248 | |
8d0843c6 | 249 | AliMUONTrack *track; |
250 | AliMUONTrackParam trackParam; | |
251 | AliMUONTriggerTrack *triggerTrack; | |
252 | ||
253 | fMUONData->SetTreeAddress("RL"); | |
254 | fMUONData->GetRecTriggerTracks(); | |
255 | TClonesArray *recTriggerTracks = fMUONData->RecTriggerTracks(); | |
256 | ||
257 | Bool_t matchTrigger; | |
c6ba19f7 | 258 | Int_t loTrgNum; |
8d0843c6 | 259 | Double_t distTriggerTrack[3]; |
208f139e | 260 | Double_t xTrack, yTrack, ySlopeTrack, chi2MatchTrigger, minChi2MatchTrigger, chi2; |
8d0843c6 | 261 | |
262 | track = (AliMUONTrack*) fRecTracksPtr->First(); | |
263 | while (track) { | |
264 | matchTrigger = kFALSE; | |
265 | chi2MatchTrigger = 0.; | |
c6ba19f7 | 266 | loTrgNum = -1; |
267 | ||
8d0843c6 | 268 | trackParam = *((AliMUONTrackParam*) (track->GetTrackParamAtHit()->Last())); |
37827b29 | 269 | AliMUONTrackExtrap::ExtrapToZ(&trackParam, AliMUONConstants::DefaultChamberZ(10)); // extrap to 1st trigger chamber |
8d0843c6 | 270 | |
271 | xTrack = trackParam.GetNonBendingCoor(); | |
272 | yTrack = trackParam.GetBendingCoor(); | |
273 | ySlopeTrack = trackParam.GetBendingSlope(); | |
208f139e | 274 | minChi2MatchTrigger = 999.; |
8d0843c6 | 275 | |
276 | triggerTrack = (AliMUONTriggerTrack*) recTriggerTracks->First(); | |
277 | while(triggerTrack){ | |
06ca6d7b | 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]; | |
208f139e | 281 | chi2 = 0.; |
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; | |
8d0843c6 | 286 | matchTrigger = kTRUE; |
208f139e | 287 | chi2MatchTrigger = chi2; |
42ef0c18 | 288 | loTrgNum=triggerTrack->GetLoTrgNum(); |
8d0843c6 | 289 | } |
290 | triggerTrack = (AliMUONTriggerTrack*) recTriggerTracks->After(triggerTrack); | |
291 | } | |
292 | ||
293 | track->SetMatchTrigger(matchTrigger); | |
c6ba19f7 | 294 | track->SetLoTrgNum(loTrgNum); |
8d0843c6 | 295 | track->SetChi2MatchTrigger(chi2MatchTrigger); |
8d0843c6 | 296 | track = (AliMUONTrack*) fRecTracksPtr->After(track); |
297 | } | |
298 | ||
299 | return; | |
300 | } | |
301 | ||
302 | //__________________________________________________________________________ | |
303 | void AliMUONVTrackReconstructor::EventReconstructTrigger(void) | |
304 | { | |
305 | /// To reconstruct trigger for one event | |
306 | AliDebug(1,"Enter EventReconstructTrigger"); | |
307 | MakeTriggerTracks(); | |
308 | return; | |
309 | } | |
310 | ||
311 | //__________________________________________________________________________ | |
312 | Bool_t AliMUONVTrackReconstructor::MakeTriggerTracks(void) | |
313 | { | |
314 | // To make the trigger tracks from Local Trigger | |
315 | AliDebug(1, "Enter MakeTriggerTracks"); | |
e6b25a6e | 316 | |
317 | TTree* treeR; | |
e6b25a6e | 318 | UChar_t gloTrigPat; |
319 | TClonesArray *localTrigger; | |
320 | TClonesArray *globalTrigger; | |
321 | AliMUONLocalTrigger *locTrg; | |
322 | AliMUONGlobalTrigger *gloTrg; | |
323 | ||
324 | treeR = fMUONData->TreeR(); | |
325 | if (!treeR) { | |
326 | AliWarning("TreeR is not loaded"); | |
327 | return kFALSE; | |
328 | } | |
329 | ||
e6b25a6e | 330 | fMUONData->SetTreeAddress("TC"); |
331 | fMUONData->GetTrigger(); | |
8d0843c6 | 332 | |
e6b25a6e | 333 | // global trigger for trigger pattern |
334 | gloTrigPat = 0; | |
335 | globalTrigger = fMUONData->GlobalTrigger(); | |
336 | gloTrg = (AliMUONGlobalTrigger*)globalTrigger->UncheckedAt(0); | |
8d0843c6 | 337 | |
e6b25a6e | 338 | if (gloTrg) |
339 | gloTrigPat = gloTrg->GetGlobalResponse(); | |
340 | ||
341 | ||
342 | // local trigger for tracking | |
343 | localTrigger = fMUONData->LocalTrigger(); | |
344 | Int_t nlocals = (Int_t) (localTrigger->GetEntries()); | |
8d0843c6 | 345 | |
e6b25a6e | 346 | Float_t z11 = AliMUONConstants::DefaultChamberZ(10); |
347 | Float_t z21 = AliMUONConstants::DefaultChamberZ(12); | |
348 | ||
349 | Float_t y11 = 0.; | |
350 | Int_t stripX21 = 0; | |
351 | Float_t y21 = 0.; | |
352 | Float_t x11 = 0.; | |
353 | ||
354 | for (Int_t i=0; i<nlocals; i++) { // loop on Local Trigger | |
355 | locTrg = (AliMUONLocalTrigger*)localTrigger->UncheckedAt(i); | |
356 | ||
357 | AliDebug(1, "AliMUONTrackReconstructor::MakeTriggerTrack using NEW trigger \n"); | |
358 | AliMUONTriggerCircuit* circuit = | |
359 | (AliMUONTriggerCircuit*)fTriggerCircuit->At(locTrg->LoCircuit()-1); // -1 !!! | |
360 | ||
361 | y11 = circuit->GetY11Pos(locTrg->LoStripX()); | |
362 | stripX21 = locTrg->LoStripX()+locTrg->LoDev()+1; | |
363 | y21 = circuit->GetY21Pos(stripX21); | |
364 | x11 = circuit->GetX11Pos(locTrg->LoStripY()); | |
365 | ||
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)); | |
368 | ||
369 | Float_t thetax = TMath::ATan2( x11 , z11 ); | |
370 | Float_t thetay = TMath::ATan2( (y21-y11) , (z21-z11) ); | |
371 | ||
372 | fTriggerTrack->SetX11(x11); | |
373 | fTriggerTrack->SetY11(y11); | |
374 | fTriggerTrack->SetThetax(thetax); | |
375 | fTriggerTrack->SetThetay(thetay); | |
376 | fTriggerTrack->SetGTPattern(gloTrigPat); | |
c6ba19f7 | 377 | fTriggerTrack->SetLoTrgNum(i); |
e6b25a6e | 378 | |
379 | fMUONData->AddRecTriggerTrack(*fTriggerTrack); | |
380 | } // end of loop on Local Trigger | |
381 | ||
382 | return kTRUE; | |
8d0843c6 | 383 | } |
384 | ||
385 | //__________________________________________________________________________ | |
386 | void AliMUONVTrackReconstructor::EventDumpTrigger(void) | |
387 | { | |
388 | /// Dump reconstructed trigger event | |
389 | /// and the particle parameters | |
390 | AliMUONTriggerTrack *triggertrack ; | |
391 | Int_t nTriggerTracks = fMUONData->RecTriggerTracks()->GetEntriesFast(); | |
392 | ||
393 | AliDebug(1, "****** enter EventDumpTrigger ******"); | |
394 | AliDebug(1, Form("Number of Reconstructed tracks : %d ", nTriggerTracks)); | |
395 | ||
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", | |
400 | trackIndex, | |
401 | triggertrack->GetX11(),triggertrack->GetY11(), | |
402 | triggertrack->GetThetax(),triggertrack->GetThetay()); | |
403 | } | |
404 | } | |
405 |