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 /// 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()
120 delete fMuonTrackRef;
121 if(fIsLoadConstructor){
122 fRunLoader->UnloadKinematics();
123 fRunLoader->UnloadTrackRefs();
124 fRunLoader->UnloadTracks();
130 //_____________________________________________________________________________
131 void AliMUONRecoCheck::MakeTrackRef()
133 /// Make reconstructible tracks
135 AliTrackReference *trackReference;
136 AliMUONTrack *muonTrack;
137 AliMUONTrackParam *trackParam;
138 AliMUONHitForRec *hitForRec;
139 Float_t x, y, z, pX, pY, pZ, pYZ;
140 Int_t track, trackSave;
142 Float_t bendingSlope = 0;
143 Float_t nonBendingSlope = 0;
144 Float_t inverseBendingMomentum = 0;
146 TTree* treeTR = fRunLoader->TreeTR();
147 if (treeTR == NULL) return;
149 TBranch* branch = treeTR->GetBranch("MUON");
150 if (branch == NULL) return;
152 TClonesArray* trackRefs = 0;
153 branch->SetAddress(&trackRefs);
154 branch->SetAutoDelete(kTRUE);
156 Int_t nTrackRef = (Int_t)branch->GetEntries();
158 track = trackSave = -999;
160 Int_t iHitMin, iChamber, detElemId;
162 trackParam = new AliMUONTrackParam();
163 hitForRec = new AliMUONHitForRec();
165 Int_t max = fRunLoader->GetHeader()->Stack()->GetNtrack();
166 for (Int_t iTrackRef = 0; iTrackRef < nTrackRef; iTrackRef++) {
168 branch->GetEntry(iTrackRef);
173 if (!trackRefs->GetEntries()) continue;
177 muonTrack = new AliMUONTrack();
179 for (Int_t iHit = iHitMin; iHit < trackRefs->GetEntries(); iHit++) {
181 trackReference = (AliTrackReference*)trackRefs->At(iHit);
182 x = trackReference->X();
183 y = trackReference->Y();
184 z = trackReference->Z();
185 pX = trackReference->Px();
186 pY = trackReference->Py();
187 pZ = trackReference->Pz();
189 track = trackReference->GetTrack();
193 << "Track ID " << track
194 << " larger than max number of particles " << max << endl;
198 if (track != trackSave && iHit != 0) {
204 // track parameters at hit
205 trackParam->SetBendingCoor(y);
206 trackParam->SetNonBendingCoor(x);
209 if (TMath::Abs(pZ) > 0) {
210 bendingSlope = pY/pZ;
211 nonBendingSlope = pX/pZ;
213 pYZ = TMath::Sqrt(pY*pY+pZ*pZ);
214 if (pYZ >0) inverseBendingMomentum = 1/pYZ;
216 trackParam->SetBendingSlope(bendingSlope);
217 trackParam->SetNonBendingSlope(nonBendingSlope);
218 trackParam->SetInverseBendingMomentum(inverseBendingMomentum);
220 hitForRec->SetBendingCoor(y);
221 hitForRec->SetNonBendingCoor(x);
223 hitForRec->SetBendingReso2(0.0);
224 hitForRec->SetNonBendingReso2(0.0);
225 detElemId = hitForRec->GetDetElemId();
226 if (detElemId) iChamber = detElemId / 100 - 1;
227 else iChamber = AliMUONConstants::ChamberNumber(z);
228 hitForRec->SetChamberNumber(iChamber);
230 muonTrack->AddTrackParamAtHit(trackParam,0);
231 muonTrack->AddHitForRecAtHit(hitForRec);
232 muonTrack->SetTrackID(track);
235 if (iHit == trackRefs->GetEntries()-1) isNewTrack = kFALSE;
238 // track parameters at vertex
239 particle = fRunLoader->GetHeader()->Stack()->Particle(muonTrack->GetTrackID());
250 trackParam->SetBendingCoor(y);
251 trackParam->SetNonBendingCoor(x);
253 if (TMath::Abs(pZ) > 0) {
254 bendingSlope = pY/pZ;
255 nonBendingSlope = pX/pZ;
257 pYZ = TMath::Sqrt(pY*pY+pZ*pZ);
258 if (pYZ >0) inverseBendingMomentum = 1/pYZ;
259 trackParam->SetBendingSlope(bendingSlope);
260 trackParam->SetNonBendingSlope(nonBendingSlope);
261 trackParam->SetInverseBendingMomentum(inverseBendingMomentum);
263 muonTrack->SetTrackParamAtVertex(trackParam);
266 AddMuonTrackReference(muonTrack);
270 } // end while isNewTrack
275 ReconstructibleTracks();
282 //____________________________________________________________________________
283 TClonesArray* AliMUONRecoCheck::GetTrackReco()
285 /// Return TClonesArray of reconstructed tracks
287 fMUONData->ResetRecTracks();
288 fMUONData->SetTreeAddress("RT");
289 fTrackReco = fMUONData->RecTracks();
290 fMUONData->GetRecTracks();
291 fRecoTracks = fTrackReco->GetEntriesFast();
294 //_____________________________________________________________________________
295 void AliMUONRecoCheck::PrintEvent() const
300 AliMUONHitForRec *hitForRec;
301 TClonesArray * hitForRecAtHit = 0;
302 Float_t xRec,yRec,zRec;
304 Int_t nTrackRef = fMuonTrackRef->GetEntriesFast();
306 printf(" ******************************* \n");
307 printf(" nb of tracks %d \n",nTrackRef);
309 for (Int_t index = 0; index < nTrackRef; index++) {
310 track = (AliMUONTrack*)fMuonTrackRef->At(index);
311 hitForRecAtHit = track->GetHitForRecAtHit();
312 Int_t nTrackHits = hitForRecAtHit->GetEntriesFast();
313 printf(" track number %d \n",index);
314 for (Int_t iHit = 0; iHit < nTrackHits; iHit++){
315 hitForRec = (AliMUONHitForRec*) hitForRecAtHit->At(iHit);
316 xRec = hitForRec->GetNonBendingCoor();
317 yRec = hitForRec->GetBendingCoor();
318 zRec = hitForRec->GetZ();
319 printf(" x,y,z: %f , %f , %f \n",xRec,yRec,zRec);
324 //_____________________________________________________________________________
325 void AliMUONRecoCheck::ResetTracks() const
329 if (fMuonTrackRef) fMuonTrackRef->Delete();
331 //_____________________________________________________________________________
332 void AliMUONRecoCheck::CleanMuonTrackRef()
334 /// Re-calculate hits parameters because two AliTrackReferences are recorded for
335 /// each chamber (one when particle is entering + one when particle is leaving
336 /// the sensitive volume)
338 Float_t maxGasGap = 1.; // cm
339 AliMUONTrack *track, *trackNew;
340 AliMUONHitForRec *hitForRec, *hitForRec1, *hitForRec2;
341 AliMUONTrackParam *trackParam, *trackParam1, *trackParam2, *trackParamAtVertex;
342 TClonesArray * hitForRecAtHit = 0;
343 TClonesArray * trackParamAtHit = 0;
344 Float_t xRec,yRec,zRec;
345 Float_t xRec1,yRec1,zRec1;
346 Float_t xRec2,yRec2,zRec2;
347 Float_t bendingSlope,nonBendingSlope,bendingMomentum;
348 Float_t bendingSlope1,nonBendingSlope1,bendingMomentum1;
349 Float_t bendingSlope2,nonBendingSlope2,bendingMomentum2;
350 TClonesArray *newMuonTrackRef = new TClonesArray("AliMUONTrack", 10);
352 Int_t iChamber = 0, detElemId = 0;
354 Int_t nTrackHits = 0;
356 hitForRec = new AliMUONHitForRec();
357 trackParam = new AliMUONTrackParam();
359 Int_t nTrackRef = fMuonTrackRef->GetEntriesFast();
360 for (Int_t index = 0; index < nTrackRef; index++) {
361 track = (AliMUONTrack*)fMuonTrackRef->At(index);
362 hitForRecAtHit = track->GetHitForRecAtHit();
363 trackParamAtHit = track->GetTrackParamAtHit();
364 trackParamAtVertex = track->GetTrackParamAtVertex();
365 nTrackHits = hitForRecAtHit->GetEntriesFast();
366 trackNew = new AliMUONTrack();
368 while (iHit1 < nTrackHits) {
369 hitForRec1 = (AliMUONHitForRec*) hitForRecAtHit->At(iHit1);
370 trackParam1 = (AliMUONTrackParam*) trackParamAtHit->At(iHit1);
371 xRec1 = hitForRec1->GetNonBendingCoor();
372 yRec1 = hitForRec1->GetBendingCoor();
373 zRec1 = hitForRec1->GetZ();
377 bendingSlope1 = trackParam1->GetBendingSlope();
378 nonBendingSlope1 = trackParam1->GetNonBendingSlope();
379 bendingMomentum1 = 0;
380 if (TMath::Abs(trackParam1->GetInverseBendingMomentum()) > 0)
381 bendingMomentum1 = 1./trackParam1->GetInverseBendingMomentum();
382 bendingSlope = bendingSlope1;
383 nonBendingSlope = nonBendingSlope1;
384 bendingMomentum = bendingMomentum1;
386 for (Int_t iHit2 = iHit1+1; iHit2 < nTrackHits; iHit2++) {
387 hitForRec2 = (AliMUONHitForRec*) hitForRecAtHit->At(iHit2);
388 trackParam2 = (AliMUONTrackParam*) trackParamAtHit->At(iHit2);
389 xRec2 = hitForRec2->GetNonBendingCoor();
390 yRec2 = hitForRec2->GetBendingCoor();
391 zRec2 = hitForRec2->GetZ();
392 bendingSlope2 = trackParam2->GetBendingSlope();
393 nonBendingSlope2 = trackParam2->GetNonBendingSlope();
394 bendingMomentum2 = 0;
395 if (TMath::Abs(trackParam2->GetInverseBendingMomentum()) > 0)
396 bendingMomentum2 = 1./trackParam2->GetInverseBendingMomentum();
398 if ( TMath::Abs(zRec2-zRec1) < maxGasGap ) {
404 bendingSlope += bendingSlope2;
405 nonBendingSlope += nonBendingSlope2;
406 bendingMomentum += bendingMomentum2;
411 xRec /= (Float_t)nRec;
412 yRec /= (Float_t)nRec;
413 zRec /= (Float_t)nRec;
414 bendingSlope /= (Float_t)nRec;
415 nonBendingSlope /= (Float_t)nRec;
416 bendingMomentum /= (Float_t)nRec;
418 hitForRec->SetNonBendingCoor(xRec);
419 hitForRec->SetBendingCoor(yRec);
420 hitForRec->SetZ(zRec);
421 detElemId = hitForRec->GetDetElemId();
422 if (detElemId) iChamber = detElemId / 100 - 1;
423 else iChamber = AliMUONConstants::ChamberNumber(zRec);
424 hitForRec->SetChamberNumber(iChamber);
425 hitForRec->SetBendingReso2(0.0);
426 hitForRec->SetNonBendingReso2(0.0);
427 trackParam->SetNonBendingCoor(xRec);
428 trackParam->SetBendingCoor(yRec);
429 trackParam->SetZ(zRec);
430 trackParam->SetNonBendingSlope(nonBendingSlope);
431 trackParam->SetBendingSlope(bendingSlope);
432 if (TMath::Abs(bendingMomentum) > 0)
433 trackParam->SetInverseBendingMomentum(1./bendingMomentum);
435 trackNew->AddHitForRecAtHit(hitForRec);
436 trackNew->AddTrackParamAtHit(trackParam,0);
441 trackNew->SetTrackID(track->GetTrackID());
442 trackNew->SetTrackParamAtVertex(trackParamAtVertex);
443 {new ((*newMuonTrackRef)[newMuonTrackRef->GetEntriesFast()]) AliMUONTrack(*trackNew);}
449 fMuonTrackRef->Delete();
450 nTrackRef = newMuonTrackRef->GetEntriesFast();
451 for (Int_t index = 0; index < nTrackRef; index++) {
452 track = (AliMUONTrack*)newMuonTrackRef->At(index);
453 AddMuonTrackReference(track);
458 newMuonTrackRef->Delete();
459 delete newMuonTrackRef;
463 //_____________________________________________________________________________
464 void AliMUONRecoCheck::ReconstructibleTracks()
466 /// Calculate the number of reconstructible tracks
469 TClonesArray* hitForRecAtHit = NULL;
470 AliMUONHitForRec* hitForRec;
472 Int_t nTrackRef, nTrackHits;
473 Int_t isChamberInTrack[10];
475 Bool_t isTrackOK = kTRUE;
477 fReconstructibleTracks = 0;
479 nTrackRef = fMuonTrackRef->GetEntriesFast();
480 for (Int_t index = 0; index < nTrackRef; index++) {
481 track = (AliMUONTrack*)fMuonTrackRef->At(index);
482 hitForRecAtHit = track->GetHitForRecAtHit();
483 nTrackHits = hitForRecAtHit->GetEntriesFast();
484 for (Int_t ch = 0; ch < 10; ch++) isChamberInTrack[ch] = 0;
486 for ( Int_t iHit = 0; iHit < nTrackHits; iHit++) {
487 hitForRec = (AliMUONHitForRec*) hitForRecAtHit->At(iHit);
488 zRec = hitForRec->GetZ();
489 iChamber = hitForRec->GetChamberNumber();
490 if (iChamber < 0 || iChamber > 10) continue;
491 isChamberInTrack[iChamber] = 1;
493 // track is reconstructible if the particle is depositing a hit
494 // in the following chamber combinations:
497 if (!isChamberInTrack[0] && !isChamberInTrack[1]) isTrackOK = kFALSE;
498 if (!isChamberInTrack[2] && !isChamberInTrack[3]) isTrackOK = kFALSE;
499 if (!isChamberInTrack[4] && !isChamberInTrack[5]) isTrackOK = kFALSE;
500 Int_t nHitsInLastStations=0;
501 for (Int_t ch = 6; ch < AliMUONConstants::NTrackingCh(); ch++)
502 if (isChamberInTrack[ch]) nHitsInLastStations++;
503 if(nHitsInLastStations < 3) isTrackOK = kFALSE;
505 if (isTrackOK) fReconstructibleTracks++;
506 if (!isTrackOK) fMuonTrackRef->Remove(track); // remove non reconstructible tracks
508 fMuonTrackRef->Compress();