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 AliMUONRecoCheck
19 /// \brief Utility class to check reconstruction
20 /// Reconstructed tracks are compared to reference tracks.
21 /// The reference tracks are built from AliTrackReference for the
22 /// hit in chamber (0..9) and from kinematics for the vertex parameters.
25 #include "AliMUONRecoCheck.h"
26 #include "AliMUONTrack.h"
27 #include "AliMUONData.h"
28 #include "AliMUONConstants.h"
30 #include "AliLoader.h"
31 #include "AliRunLoader.h"
32 #include "AliHeader.h"
34 #include "AliTrackReference.h"
37 #include <TParticle.h>
40 ClassImp(AliMUONRecoCheck)
43 //_____________________________________________________________________________
44 AliMUONRecoCheck::AliMUONRecoCheck(Char_t *chLoader)
50 fReconstructibleTracks(0),
52 fIsLoadConstructor(kTRUE)
54 /// Constructor using "galice.root",
55 /// takes care of loading/unloading Kinematics, TrackRefs and Tracks
57 fMuonTrackRef = new TClonesArray("AliMUONTrack", 10);
60 fRunLoader = AliRunLoader::Open(chLoader);
62 AliError(Form("no run loader found " ));
67 AliLoader *loader = fRunLoader->GetLoader("MUONLoader");
70 fMUONData = new AliMUONData(loader,"MUON","MUON");
72 AliError(Form("no MUONData found " ));
76 fRunLoader->LoadKinematics("READ");
77 fRunLoader->LoadTrackRefs("READ");
78 loader->LoadTracks("READ");
82 //_____________________________________________________________________________
83 AliMUONRecoCheck::AliMUONRecoCheck(AliRunLoader *runloader, AliMUONData *muondata)
89 fReconstructibleTracks(0),
91 fIsLoadConstructor(kFALSE)
93 /// Constructor from AliRunLoader and AliMUONData,
94 /// does not load/unload Kinematics, TrackRefs and Tracks internally
95 /// it should be done in the execution program (e.g. see MUONRecoCheck.C)
97 fMuonTrackRef = new TClonesArray("AliMUONTrack", 10);
100 fRunLoader = runloader;
102 AliError(Form("no run loader found " ));
107 fMUONData = muondata;
109 AliError(Form("no MUONData found " ));
116 //_____________________________________________________________________________
117 AliMUONRecoCheck::~AliMUONRecoCheck()
121 delete fMuonTrackRef;
122 if(fIsLoadConstructor){
123 fRunLoader->UnloadKinematics();
124 fRunLoader->UnloadTrackRefs();
125 fRunLoader->UnloadTracks();
131 //_____________________________________________________________________________
132 void AliMUONRecoCheck::MakeTrackRef()
134 /// Make reconstructible tracks
136 AliTrackReference *trackReference;
137 AliMUONTrack *muonTrack;
138 AliMUONTrackParam *trackParam;
139 AliMUONHitForRec *hitForRec;
140 Float_t x, y, z, pX, pY, pZ, pYZ;
141 Int_t track, trackSave;
143 Float_t bendingSlope = 0;
144 Float_t nonBendingSlope = 0;
145 Float_t inverseBendingMomentum = 0;
147 TTree* treeTR = fRunLoader->TreeTR();
148 if (treeTR == NULL) return;
150 TBranch* branch = treeTR->GetBranch("MUON");
151 if (branch == NULL) return;
153 TClonesArray* trackRefs = 0;
154 branch->SetAddress(&trackRefs);
155 branch->SetAutoDelete(kTRUE);
157 Int_t nTrackRef = (Int_t)branch->GetEntries();
159 track = trackSave = -999;
161 Int_t iHitMin, iChamber, detElemId;
163 trackParam = new AliMUONTrackParam();
164 hitForRec = new AliMUONHitForRec();
166 Int_t max = fRunLoader->GetHeader()->Stack()->GetNtrack();
167 for (Int_t iTrackRef = 0; iTrackRef < nTrackRef; iTrackRef++) {
169 branch->GetEntry(iTrackRef);
174 if (!trackRefs->GetEntries()) continue;
178 muonTrack = new AliMUONTrack();
180 for (Int_t iHit = iHitMin; iHit < trackRefs->GetEntries(); iHit++) {
182 trackReference = (AliTrackReference*)trackRefs->At(iHit);
183 x = trackReference->X();
184 y = trackReference->Y();
185 z = trackReference->Z();
186 pX = trackReference->Px();
187 pY = trackReference->Py();
188 pZ = trackReference->Pz();
190 track = trackReference->GetTrack();
194 << "Track ID " << track
195 << " larger than max number of particles " << max << endl;
199 if (track != trackSave && iHit != 0) {
205 // track parameters at hit
206 trackParam->SetBendingCoor(y);
207 trackParam->SetNonBendingCoor(x);
210 if (TMath::Abs(pZ) > 0) {
211 bendingSlope = pY/pZ;
212 nonBendingSlope = pX/pZ;
214 pYZ = TMath::Sqrt(pY*pY+pZ*pZ);
215 if (pYZ >0) inverseBendingMomentum = 1/pYZ;
217 trackParam->SetBendingSlope(bendingSlope);
218 trackParam->SetNonBendingSlope(nonBendingSlope);
219 trackParam->SetInverseBendingMomentum(inverseBendingMomentum);
221 hitForRec->SetBendingCoor(y);
222 hitForRec->SetNonBendingCoor(x);
224 hitForRec->SetBendingReso2(0.0);
225 hitForRec->SetNonBendingReso2(0.0);
226 detElemId = hitForRec->GetDetElemId();
227 if (detElemId) iChamber = detElemId / 100 - 1;
228 else iChamber = AliMUONConstants::ChamberNumber(z);
229 hitForRec->SetChamberNumber(iChamber);
231 muonTrack->AddTrackParamAtHit(trackParam,0);
232 muonTrack->AddHitForRecAtHit(hitForRec);
233 muonTrack->SetTrackID(track);
236 if (iHit == trackRefs->GetEntries()-1) isNewTrack = kFALSE;
239 // track parameters at vertex
240 particle = fRunLoader->GetHeader()->Stack()->Particle(muonTrack->GetTrackID());
251 trackParam->SetBendingCoor(y);
252 trackParam->SetNonBendingCoor(x);
254 if (TMath::Abs(pZ) > 0) {
255 bendingSlope = pY/pZ;
256 nonBendingSlope = pX/pZ;
258 pYZ = TMath::Sqrt(pY*pY+pZ*pZ);
259 if (pYZ >0) inverseBendingMomentum = 1/pYZ;
260 trackParam->SetBendingSlope(bendingSlope);
261 trackParam->SetNonBendingSlope(nonBendingSlope);
262 trackParam->SetInverseBendingMomentum(inverseBendingMomentum);
264 muonTrack->SetTrackParamAtVertex(trackParam);
267 AddMuonTrackReference(muonTrack);
271 } // end while isNewTrack
276 ReconstructibleTracks();
283 //____________________________________________________________________________
284 TClonesArray* AliMUONRecoCheck::GetTrackReco()
286 /// Return TClonesArray of reconstructed tracks
288 fMUONData->ResetRecTracks();
289 fMUONData->SetTreeAddress("RT");
290 fTrackReco = fMUONData->RecTracks();
291 fMUONData->GetRecTracks();
292 fRecoTracks = fTrackReco->GetEntriesFast();
295 //_____________________________________________________________________________
296 void AliMUONRecoCheck::PrintEvent() const
301 AliMUONHitForRec *hitForRec;
302 TClonesArray * hitForRecAtHit = 0;
303 Float_t xRec,yRec,zRec;
305 Int_t nTrackRef = fMuonTrackRef->GetEntriesFast();
307 printf(" ******************************* \n");
308 printf(" nb of tracks %d \n",nTrackRef);
310 for (Int_t index = 0; index < nTrackRef; index++) {
311 track = (AliMUONTrack*)fMuonTrackRef->At(index);
312 hitForRecAtHit = track->GetHitForRecAtHit();
313 Int_t nTrackHits = hitForRecAtHit->GetEntriesFast();
314 printf(" track number %d \n",index);
315 for (Int_t iHit = 0; iHit < nTrackHits; iHit++){
316 hitForRec = (AliMUONHitForRec*) hitForRecAtHit->At(iHit);
317 xRec = hitForRec->GetNonBendingCoor();
318 yRec = hitForRec->GetBendingCoor();
319 zRec = hitForRec->GetZ();
320 printf(" x,y,z: %f , %f , %f \n",xRec,yRec,zRec);
325 //_____________________________________________________________________________
326 void AliMUONRecoCheck::ResetTracks() const
330 if (fMuonTrackRef) fMuonTrackRef->Clear();
332 //_____________________________________________________________________________
333 void AliMUONRecoCheck::CleanMuonTrackRef()
335 /// Re-calculate hits parameters because two AliTrackReferences are recorded for
336 /// each chamber (one when particle is entering + one when particle is leaving
337 /// the sensitive volume)
339 Float_t maxGasGap = 1.; // cm
340 AliMUONTrack *track, *trackNew;
341 AliMUONHitForRec *hitForRec, *hitForRec1, *hitForRec2;
342 AliMUONTrackParam *trackParam, *trackParam1, *trackParam2, *trackParamAtVertex;
343 TClonesArray * hitForRecAtHit = 0;
344 TClonesArray * trackParamAtHit = 0;
345 Float_t xRec,yRec,zRec;
346 Float_t xRec1,yRec1,zRec1;
347 Float_t xRec2,yRec2,zRec2;
348 Float_t bendingSlope,nonBendingSlope,bendingMomentum;
349 Float_t bendingSlope1,nonBendingSlope1,bendingMomentum1;
350 Float_t bendingSlope2,nonBendingSlope2,bendingMomentum2;
351 TClonesArray *newMuonTrackRef = new TClonesArray("AliMUONTrack", 10);
353 Int_t iChamber = 0, detElemId = 0;
355 Int_t nTrackHits = 0;
357 hitForRec = new AliMUONHitForRec();
358 trackParam = new AliMUONTrackParam();
360 Int_t nTrackRef = fMuonTrackRef->GetEntriesFast();
361 for (Int_t index = 0; index < nTrackRef; index++) {
362 track = (AliMUONTrack*)fMuonTrackRef->At(index);
363 hitForRecAtHit = track->GetHitForRecAtHit();
364 trackParamAtHit = track->GetTrackParamAtHit();
365 trackParamAtVertex = track->GetTrackParamAtVertex();
366 nTrackHits = hitForRecAtHit->GetEntriesFast();
367 trackNew = new AliMUONTrack();
369 while (iHit1 < nTrackHits) {
370 hitForRec1 = (AliMUONHitForRec*) hitForRecAtHit->At(iHit1);
371 trackParam1 = (AliMUONTrackParam*) trackParamAtHit->At(iHit1);
372 xRec1 = hitForRec1->GetNonBendingCoor();
373 yRec1 = hitForRec1->GetBendingCoor();
374 zRec1 = hitForRec1->GetZ();
378 bendingSlope1 = trackParam1->GetBendingSlope();
379 nonBendingSlope1 = trackParam1->GetNonBendingSlope();
380 bendingMomentum1 = 0;
381 if (TMath::Abs(trackParam1->GetInverseBendingMomentum()) > 0)
382 bendingMomentum1 = 1./trackParam1->GetInverseBendingMomentum();
383 bendingSlope = bendingSlope1;
384 nonBendingSlope = nonBendingSlope1;
385 bendingMomentum = bendingMomentum1;
387 for (Int_t iHit2 = iHit1+1; iHit2 < nTrackHits; iHit2++) {
388 hitForRec2 = (AliMUONHitForRec*) hitForRecAtHit->At(iHit2);
389 trackParam2 = (AliMUONTrackParam*) trackParamAtHit->At(iHit2);
390 xRec2 = hitForRec2->GetNonBendingCoor();
391 yRec2 = hitForRec2->GetBendingCoor();
392 zRec2 = hitForRec2->GetZ();
393 bendingSlope2 = trackParam2->GetBendingSlope();
394 nonBendingSlope2 = trackParam2->GetNonBendingSlope();
395 bendingMomentum2 = 0;
396 if (TMath::Abs(trackParam2->GetInverseBendingMomentum()) > 0)
397 bendingMomentum2 = 1./trackParam2->GetInverseBendingMomentum();
399 if ( TMath::Abs(zRec2-zRec1) < maxGasGap ) {
405 bendingSlope += bendingSlope2;
406 nonBendingSlope += nonBendingSlope2;
407 bendingMomentum += bendingMomentum2;
412 xRec /= (Float_t)nRec;
413 yRec /= (Float_t)nRec;
414 zRec /= (Float_t)nRec;
415 bendingSlope /= (Float_t)nRec;
416 nonBendingSlope /= (Float_t)nRec;
417 bendingMomentum /= (Float_t)nRec;
419 hitForRec->SetNonBendingCoor(xRec);
420 hitForRec->SetBendingCoor(yRec);
421 hitForRec->SetZ(zRec);
422 detElemId = hitForRec->GetDetElemId();
423 if (detElemId) iChamber = detElemId / 100 - 1;
424 else iChamber = AliMUONConstants::ChamberNumber(zRec);
425 hitForRec->SetChamberNumber(iChamber);
426 hitForRec->SetBendingReso2(0.0);
427 hitForRec->SetNonBendingReso2(0.0);
428 trackParam->SetNonBendingCoor(xRec);
429 trackParam->SetBendingCoor(yRec);
430 trackParam->SetZ(zRec);
431 trackParam->SetNonBendingSlope(nonBendingSlope);
432 trackParam->SetBendingSlope(bendingSlope);
433 if (TMath::Abs(bendingMomentum) > 0)
434 trackParam->SetInverseBendingMomentum(1./bendingMomentum);
436 trackNew->AddHitForRecAtHit(hitForRec);
437 trackNew->AddTrackParamAtHit(trackParam,0);
442 trackNew->SetTrackID(track->GetTrackID());
443 trackNew->SetTrackParamAtVertex(trackParamAtVertex);
444 {new ((*newMuonTrackRef)[newMuonTrackRef->GetEntriesFast()]) AliMUONTrack(*trackNew);}
450 fMuonTrackRef->Clear();
451 nTrackRef = newMuonTrackRef->GetEntriesFast();
452 for (Int_t index = 0; index < nTrackRef; index++) {
453 track = (AliMUONTrack*)newMuonTrackRef->At(index);
454 AddMuonTrackReference(track);
459 newMuonTrackRef->Delete();
460 delete newMuonTrackRef;
464 //_____________________________________________________________________________
465 void AliMUONRecoCheck::ReconstructibleTracks()
467 /// Calculate the number of reconstructible tracks
470 TClonesArray* hitForRecAtHit = NULL;
471 AliMUONHitForRec* hitForRec;
473 Int_t nTrackRef, nTrackHits;
474 Int_t isChamberInTrack[10];
476 Bool_t isTrackOK = kTRUE;
478 fReconstructibleTracks = 0;
480 nTrackRef = fMuonTrackRef->GetEntriesFast();
481 for (Int_t index = 0; index < nTrackRef; index++) {
482 track = (AliMUONTrack*)fMuonTrackRef->At(index);
483 hitForRecAtHit = track->GetHitForRecAtHit();
484 nTrackHits = hitForRecAtHit->GetEntriesFast();
485 for (Int_t ch = 0; ch < 10; ch++) isChamberInTrack[ch] = 0;
487 for ( Int_t iHit = 0; iHit < nTrackHits; iHit++) {
488 hitForRec = (AliMUONHitForRec*) hitForRecAtHit->At(iHit);
489 zRec = hitForRec->GetZ();
490 iChamber = hitForRec->GetChamberNumber();
491 if (iChamber < 0 || iChamber > 10) continue;
492 isChamberInTrack[iChamber] = 1;
494 // track is reconstructible if the particle is depositing a hit
495 // in the following chamber combinations:
498 if (!isChamberInTrack[0] && !isChamberInTrack[1]) isTrackOK = kFALSE;
499 if (!isChamberInTrack[2] && !isChamberInTrack[3]) isTrackOK = kFALSE;
500 if (!isChamberInTrack[4] && !isChamberInTrack[5]) isTrackOK = kFALSE;
501 Int_t nHitsInLastStations=0;
502 for (Int_t ch = 6; ch < AliMUONConstants::NTrackingCh(); ch++)
503 if (isChamberInTrack[ch]) nHitsInLastStations++;
504 if(nHitsInLastStations < 3) isTrackOK = kFALSE;
506 if (isTrackOK) fReconstructibleTracks++;
507 if (!isTrackOK) fMuonTrackRef->Remove(track); // remove non reconstructible tracks
509 fMuonTrackRef->Compress();