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>
38 #include <TParticlePDG.h>
41 ClassImp(AliMUONRecoCheck)
44 //_____________________________________________________________________________
45 AliMUONRecoCheck::AliMUONRecoCheck(Char_t *chLoader)
51 fReconstructibleTracks(0),
53 fIsLoadConstructor(kTRUE)
55 /// Constructor using "galice.root",
56 /// takes care of loading/unloading Kinematics, TrackRefs and Tracks
58 fMuonTrackRef = new TClonesArray("AliMUONTrack", 10);
61 fRunLoader = AliRunLoader::Open(chLoader);
63 AliError(Form("no run loader found " ));
68 AliLoader *loader = fRunLoader->GetLoader("MUONLoader");
71 fMUONData = new AliMUONData(loader,"MUON","MUON");
73 AliError(Form("no MUONData found " ));
77 fRunLoader->LoadKinematics("READ");
78 fRunLoader->LoadTrackRefs("READ");
79 loader->LoadTracks("READ");
83 //_____________________________________________________________________________
84 AliMUONRecoCheck::AliMUONRecoCheck(AliRunLoader *runloader, AliMUONData *muondata)
90 fReconstructibleTracks(0),
92 fIsLoadConstructor(kFALSE)
94 /// Constructor from AliRunLoader and AliMUONData,
95 /// does not load/unload Kinematics, TrackRefs and Tracks internally
96 /// it should be done in the execution program (e.g. see MUONRecoCheck.C)
98 fMuonTrackRef = new TClonesArray("AliMUONTrack", 10);
101 fRunLoader = runloader;
103 AliError(Form("no run loader found " ));
108 fMUONData = muondata;
110 AliError(Form("no MUONData found " ));
117 //_____________________________________________________________________________
118 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();
169 Int_t max = fRunLoader->GetHeader()->Stack()->GetNtrack();
170 for (Int_t iTrackRef = 0; iTrackRef < nTrackRef; iTrackRef++) {
172 branch->GetEntry(iTrackRef);
177 if (!trackRefs->GetEntries()) continue;
181 muonTrack = new AliMUONTrack();
183 for (Int_t iHit = iHitMin; iHit < trackRefs->GetEntries(); iHit++) {
185 trackReference = (AliTrackReference*)trackRefs->At(iHit);
186 x = trackReference->X();
187 y = trackReference->Y();
188 z = trackReference->Z();
189 pX = trackReference->Px();
190 pY = trackReference->Py();
191 pZ = trackReference->Pz();
193 track = trackReference->GetTrack();
197 << "Track ID " << track
198 << " larger than max number of particles " << max << endl;
202 if (track != trackSave && iHit != 0) {
208 // track parameters at hit
209 trackParam->SetBendingCoor(y);
210 trackParam->SetNonBendingCoor(x);
213 if (TMath::Abs(pZ) > 0) {
214 bendingSlope = pY/pZ;
215 nonBendingSlope = pX/pZ;
217 pYZ = TMath::Sqrt(pY*pY+pZ*pZ);
218 if (pYZ >0) inverseBendingMomentum = 1/pYZ;
220 trackParam->SetBendingSlope(bendingSlope);
221 trackParam->SetNonBendingSlope(nonBendingSlope);
222 trackParam->SetInverseBendingMomentum(inverseBendingMomentum);
224 hitForRec->SetBendingCoor(y);
225 hitForRec->SetNonBendingCoor(x);
227 hitForRec->SetBendingReso2(0.0);
228 hitForRec->SetNonBendingReso2(0.0);
229 detElemId = hitForRec->GetDetElemId();
230 if (detElemId) iChamber = detElemId / 100 - 1;
231 else iChamber = AliMUONConstants::ChamberNumber(z);
232 hitForRec->SetChamberNumber(iChamber);
234 muonTrack->AddTrackParamAtHit(trackParam,0);
235 muonTrack->AddHitForRecAtHit(hitForRec);
236 muonTrack->SetTrackID(track);
239 if (iHit == trackRefs->GetEntries()-1) isNewTrack = kFALSE;
242 // track parameters at vertex
243 particle = fRunLoader->GetHeader()->Stack()->Particle(muonTrack->GetTrackID());
254 trackParam->SetBendingCoor(y);
255 trackParam->SetNonBendingCoor(x);
257 if (TMath::Abs(pZ) > 0) {
258 bendingSlope = pY/pZ;
259 nonBendingSlope = pX/pZ;
262 pYZ = TMath::Sqrt(pY*pY+pZ*pZ);
263 if (pYZ >0) inverseBendingMomentum = 1/pYZ;
265 ppdg = particle->GetPDG(1);
266 charge = (Int_t)(ppdg->Charge()/3.0);
267 inverseBendingMomentum *= charge;
269 trackParam->SetBendingSlope(bendingSlope);
270 trackParam->SetNonBendingSlope(nonBendingSlope);
271 trackParam->SetInverseBendingMomentum(inverseBendingMomentum);
273 muonTrack->SetTrackParamAtVertex(trackParam);
276 AddMuonTrackReference(muonTrack);
280 } // end while isNewTrack
285 ReconstructibleTracks();
292 //____________________________________________________________________________
293 TClonesArray* AliMUONRecoCheck::GetTrackReco()
295 /// Return TClonesArray of reconstructed tracks
297 fMUONData->ResetRecTracks();
298 fMUONData->SetTreeAddress("RT");
299 fTrackReco = fMUONData->RecTracks();
300 fMUONData->GetRecTracks();
301 fRecoTracks = fTrackReco->GetEntriesFast();
304 //_____________________________________________________________________________
305 void AliMUONRecoCheck::PrintEvent() const
310 AliMUONHitForRec *hitForRec;
311 TClonesArray * hitForRecAtHit = 0;
312 Float_t xRec,yRec,zRec;
314 Int_t nTrackRef = fMuonTrackRef->GetEntriesFast();
316 printf(" ******************************* \n");
317 printf(" nb of tracks %d \n",nTrackRef);
319 for (Int_t index = 0; index < nTrackRef; index++) {
320 track = (AliMUONTrack*)fMuonTrackRef->At(index);
321 hitForRecAtHit = track->GetHitForRecAtHit();
322 Int_t nTrackHits = hitForRecAtHit->GetEntriesFast();
323 printf(" track number %d \n",index);
324 for (Int_t iHit = 0; iHit < nTrackHits; iHit++){
325 hitForRec = (AliMUONHitForRec*) hitForRecAtHit->At(iHit);
326 xRec = hitForRec->GetNonBendingCoor();
327 yRec = hitForRec->GetBendingCoor();
328 zRec = hitForRec->GetZ();
329 printf(" x,y,z: %f , %f , %f \n",xRec,yRec,zRec);
334 //_____________________________________________________________________________
335 void AliMUONRecoCheck::ResetTracks() const
339 if (fMuonTrackRef) fMuonTrackRef->Delete();
341 //_____________________________________________________________________________
342 void AliMUONRecoCheck::CleanMuonTrackRef()
344 /// Re-calculate hits parameters because two AliTrackReferences are recorded for
345 /// each chamber (one when particle is entering + one when particle is leaving
346 /// the sensitive volume)
348 Float_t maxGasGap = 1.; // cm
349 AliMUONTrack *track, *trackNew;
350 AliMUONHitForRec *hitForRec, *hitForRec1, *hitForRec2;
351 AliMUONTrackParam *trackParam, *trackParam1, *trackParam2, *trackParamAtVertex;
352 TClonesArray * hitForRecAtHit = 0;
353 TClonesArray * trackParamAtHit = 0;
354 Float_t xRec,yRec,zRec;
355 Float_t xRec1,yRec1,zRec1;
356 Float_t xRec2,yRec2,zRec2;
357 Float_t bendingSlope,nonBendingSlope,bendingMomentum;
358 Float_t bendingSlope1,nonBendingSlope1,bendingMomentum1;
359 Float_t bendingSlope2,nonBendingSlope2,bendingMomentum2;
360 TClonesArray *newMuonTrackRef = new TClonesArray("AliMUONTrack", 10);
362 Int_t iChamber = 0, detElemId = 0;
364 Int_t nTrackHits = 0;
366 hitForRec = new AliMUONHitForRec();
367 trackParam = new AliMUONTrackParam();
369 Int_t nTrackRef = fMuonTrackRef->GetEntriesFast();
370 for (Int_t index = 0; index < nTrackRef; index++) {
371 track = (AliMUONTrack*)fMuonTrackRef->At(index);
372 hitForRecAtHit = track->GetHitForRecAtHit();
373 trackParamAtHit = track->GetTrackParamAtHit();
374 trackParamAtVertex = track->GetTrackParamAtVertex();
375 nTrackHits = hitForRecAtHit->GetEntriesFast();
376 trackNew = new AliMUONTrack();
378 while (iHit1 < nTrackHits) {
379 hitForRec1 = (AliMUONHitForRec*) hitForRecAtHit->At(iHit1);
380 trackParam1 = (AliMUONTrackParam*) trackParamAtHit->At(iHit1);
381 xRec1 = hitForRec1->GetNonBendingCoor();
382 yRec1 = hitForRec1->GetBendingCoor();
383 zRec1 = hitForRec1->GetZ();
387 bendingSlope1 = trackParam1->GetBendingSlope();
388 nonBendingSlope1 = trackParam1->GetNonBendingSlope();
389 bendingMomentum1 = 0;
390 if (TMath::Abs(trackParam1->GetInverseBendingMomentum()) > 0)
391 bendingMomentum1 = 1./trackParam1->GetInverseBendingMomentum();
392 bendingSlope = bendingSlope1;
393 nonBendingSlope = nonBendingSlope1;
394 bendingMomentum = bendingMomentum1;
396 for (Int_t iHit2 = iHit1+1; iHit2 < nTrackHits; iHit2++) {
397 hitForRec2 = (AliMUONHitForRec*) hitForRecAtHit->At(iHit2);
398 trackParam2 = (AliMUONTrackParam*) trackParamAtHit->At(iHit2);
399 xRec2 = hitForRec2->GetNonBendingCoor();
400 yRec2 = hitForRec2->GetBendingCoor();
401 zRec2 = hitForRec2->GetZ();
402 bendingSlope2 = trackParam2->GetBendingSlope();
403 nonBendingSlope2 = trackParam2->GetNonBendingSlope();
404 bendingMomentum2 = 0;
405 if (TMath::Abs(trackParam2->GetInverseBendingMomentum()) > 0)
406 bendingMomentum2 = 1./trackParam2->GetInverseBendingMomentum();
408 if ( TMath::Abs(zRec2-zRec1) < maxGasGap ) {
414 bendingSlope += bendingSlope2;
415 nonBendingSlope += nonBendingSlope2;
416 bendingMomentum += bendingMomentum2;
421 xRec /= (Float_t)nRec;
422 yRec /= (Float_t)nRec;
423 zRec /= (Float_t)nRec;
424 bendingSlope /= (Float_t)nRec;
425 nonBendingSlope /= (Float_t)nRec;
426 bendingMomentum /= (Float_t)nRec;
428 hitForRec->SetNonBendingCoor(xRec);
429 hitForRec->SetBendingCoor(yRec);
430 hitForRec->SetZ(zRec);
431 detElemId = hitForRec->GetDetElemId();
432 if (detElemId) iChamber = detElemId / 100 - 1;
433 else iChamber = AliMUONConstants::ChamberNumber(zRec);
434 hitForRec->SetChamberNumber(iChamber);
435 hitForRec->SetBendingReso2(0.0);
436 hitForRec->SetNonBendingReso2(0.0);
437 trackParam->SetNonBendingCoor(xRec);
438 trackParam->SetBendingCoor(yRec);
439 trackParam->SetZ(zRec);
440 trackParam->SetNonBendingSlope(nonBendingSlope);
441 trackParam->SetBendingSlope(bendingSlope);
442 if (TMath::Abs(bendingMomentum) > 0)
443 trackParam->SetInverseBendingMomentum(1./bendingMomentum);
445 trackNew->AddHitForRecAtHit(hitForRec);
446 trackNew->AddTrackParamAtHit(trackParam,0);
451 trackNew->SetTrackID(track->GetTrackID());
452 trackNew->SetTrackParamAtVertex(trackParamAtVertex);
453 {new ((*newMuonTrackRef)[newMuonTrackRef->GetEntriesFast()]) AliMUONTrack(*trackNew);}
459 fMuonTrackRef->Delete();
460 nTrackRef = newMuonTrackRef->GetEntriesFast();
461 for (Int_t index = 0; index < nTrackRef; index++) {
462 track = (AliMUONTrack*)newMuonTrackRef->At(index);
463 AddMuonTrackReference(track);
468 newMuonTrackRef->Delete();
469 delete newMuonTrackRef;
473 //_____________________________________________________________________________
474 void AliMUONRecoCheck::ReconstructibleTracks()
476 /// Calculate the number of reconstructible tracks
479 TClonesArray* hitForRecAtHit = NULL;
480 AliMUONHitForRec* hitForRec;
482 Int_t nTrackRef, nTrackHits;
483 Int_t isChamberInTrack[10];
485 Bool_t isTrackOK = kTRUE;
487 fReconstructibleTracks = 0;
489 nTrackRef = fMuonTrackRef->GetEntriesFast();
490 for (Int_t index = 0; index < nTrackRef; index++) {
491 track = (AliMUONTrack*)fMuonTrackRef->At(index);
492 hitForRecAtHit = track->GetHitForRecAtHit();
493 nTrackHits = hitForRecAtHit->GetEntriesFast();
494 for (Int_t ch = 0; ch < 10; ch++) isChamberInTrack[ch] = 0;
496 for ( Int_t iHit = 0; iHit < nTrackHits; iHit++) {
497 hitForRec = (AliMUONHitForRec*) hitForRecAtHit->At(iHit);
498 zRec = hitForRec->GetZ();
499 iChamber = hitForRec->GetChamberNumber();
500 if (iChamber < 0 || iChamber > 10) continue;
501 isChamberInTrack[iChamber] = 1;
503 // track is reconstructible if the particle is depositing a hit
504 // in the following chamber combinations:
507 if (!isChamberInTrack[0] && !isChamberInTrack[1]) isTrackOK = kFALSE;
508 if (!isChamberInTrack[2] && !isChamberInTrack[3]) isTrackOK = kFALSE;
509 if (!isChamberInTrack[4] && !isChamberInTrack[5]) isTrackOK = kFALSE;
510 Int_t nHitsInLastStations=0;
511 for (Int_t ch = 6; ch < AliMUONConstants::NTrackingCh(); ch++)
512 if (isChamberInTrack[ch]) nHitsInLastStations++;
513 if(nHitsInLastStations < 3) isTrackOK = kFALSE;
515 if (isTrackOK) fReconstructibleTracks++;
516 if (!isTrackOK) fMuonTrackRef->Remove(track); // remove non reconstructible tracks
518 fMuonTrackRef->Compress();