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 // -----------------------
19 // Class AliMUONRecoCheck
20 // -----------------------
21 // Utility class to check the muon reconstruction. Reconstructed tracks are compared
22 // to reference tracks. The reference tracks are built from AliTrackReference for the
23 // hit in chamber (0..9) and from kinematics for the vertex parameters.
25 #include <TParticle.h>
27 #include "AliRun.h" // for gAlice
29 #include "AliLoader.h"
30 #include "AliRunLoader.h"
31 #include "AliTrackReference.h"
32 #include "AliHeader.h"
36 #include "AliMUONRecoCheck.h"
37 #include "AliMUONTrack.h"
38 #include "AliMUONData.h"
39 #include "AliMUONConstants.h"
41 ClassImp(AliMUONRecoCheck)
43 //_____________________________________________________________________________
44 AliMUONRecoCheck::AliMUONRecoCheck(Char_t *chLoader)
47 fMuonTrackRef = new TClonesArray("AliMUONTrack", 10);
49 // open the run loader
50 fRunLoader = AliRunLoader::Open(chLoader);
52 AliError(Form("no run loader found in file %s","galice.root" ));
55 // initialize loader's
56 AliLoader *loader = fRunLoader->GetLoader("MUONLoader");
58 // initialize container
59 fMUONData = new AliMUONData(loader,"MUON","MUON");
61 // Loading AliRun master
62 if (fRunLoader->GetAliRun() == 0x0) fRunLoader->LoadgAlice();
64 fRunLoader->LoadKinematics("READ");
65 fRunLoader->LoadTrackRefs("READ");
66 loader->LoadTracks("READ");
68 fReconstructibleTracks = 0;
72 //____________________________________________________________________
73 AliMUONRecoCheck::AliMUONRecoCheck(const AliMUONRecoCheck& rhs)
76 /// Protected copy constructor
78 AliFatal("Not implemented.");
81 //_____________________________________________________________________________
82 AliMUONRecoCheck::~AliMUONRecoCheck()
86 fRunLoader->UnloadKinematics();
87 fRunLoader->UnloadTrackRefs();
88 fRunLoader->UnloadTracks();
89 fMuonTrackRef->Delete();
94 //________________________________________________________________________
95 AliMUONRecoCheck& AliMUONRecoCheck::operator = (const AliMUONRecoCheck& rhs)
97 /// Protected assignement operator
99 if (this == &rhs) return *this;
101 AliFatal("Not implemented.");
106 //_____________________________________________________________________________
107 void AliMUONRecoCheck::MakeTrackRef()
109 /// Make reconstructible tracks
111 AliTrackReference *trackReference;
112 AliMUONTrack *muonTrack;
113 AliMUONTrackParam *trackParam;
114 AliMUONHitForRec *hitForRec;
115 Float_t x, y, z, pX, pY, pZ, pYZ;
116 Int_t track, trackSave;
118 Float_t bendingSlope = 0;
119 Float_t nonBendingSlope = 0;
120 Float_t inverseBendingMomentum = 0;
122 TTree* treeTR = fRunLoader->TreeTR();
123 if (treeTR == NULL) return;
125 TBranch* branch = treeTR->GetBranch("MUON");
126 if (branch == NULL) return;
128 TClonesArray* trackRefs = 0;
129 branch->SetAddress(&trackRefs);
130 branch->SetAutoDelete(kTRUE);
132 Int_t nTrackRef = (Int_t)branch->GetEntries();
134 track = trackSave = -999;
136 Int_t iHitMin, iChamber;
138 trackParam = new AliMUONTrackParam();
139 hitForRec = new AliMUONHitForRec();
140 muonTrack = new AliMUONTrack();
142 for (Int_t iTrackRef = 0; iTrackRef < nTrackRef; iTrackRef++) {
143 branch->GetEntry(iTrackRef);
148 if (!trackRefs->GetEntries()) continue;
152 for (Int_t iHit = iHitMin; iHit < trackRefs->GetEntries(); iHit++) {
154 trackReference = (AliTrackReference*)trackRefs->At(iHit);
155 x = trackReference->X();
156 y = trackReference->Y();
157 z = trackReference->Z();
158 pX = trackReference->Px();
159 pY = trackReference->Py();
160 pZ = trackReference->Pz();
162 track = trackReference->GetTrack();
164 if (track != trackSave && iHit != 0) {
170 // track parameters at hit
171 trackParam->SetBendingCoor(y);
172 trackParam->SetNonBendingCoor(x);
175 if (TMath::Abs(pZ) > 0) {
176 bendingSlope = pY/pZ;
177 nonBendingSlope = pX/pZ;
179 pYZ = TMath::Sqrt(pY*pY+pZ*pZ);
180 if (pYZ >0) inverseBendingMomentum = 1/pYZ;
182 trackParam->SetBendingSlope(bendingSlope);
183 trackParam->SetNonBendingSlope(nonBendingSlope);
184 trackParam->SetInverseBendingMomentum(inverseBendingMomentum);
186 hitForRec->SetBendingCoor(y);
187 hitForRec->SetNonBendingCoor(x);
189 hitForRec->SetBendingReso2(0.0);
190 hitForRec->SetNonBendingReso2(0.0);
191 iChamber = AliMUONConstants::ChamberNumber(z);
192 hitForRec->SetChamberNumber(iChamber);
194 muonTrack->AddTrackParamAtHit(trackParam);
195 muonTrack->AddHitForRecAtHit(hitForRec);
196 muonTrack->SetTrackID(track);
199 if (iHit == trackRefs->GetEntries()-1) isNewTrack = kFALSE;
202 // track parameters at vertex
203 particle = fRunLoader->GetHeader()->Stack()->Particle(muonTrack->GetTrackID());
212 trackParam->SetBendingCoor(y);
213 trackParam->SetNonBendingCoor(x);
215 if (TMath::Abs(pZ) > 0) {
216 bendingSlope = pY/pZ;
217 nonBendingSlope = pX/pZ;
219 pYZ = TMath::Sqrt(pY*pY+pZ*pZ);
220 if (pYZ >0) inverseBendingMomentum = 1/pYZ;
221 trackParam->SetBendingSlope(bendingSlope);
222 trackParam->SetNonBendingSlope(nonBendingSlope);
223 trackParam->SetInverseBendingMomentum(inverseBendingMomentum);
225 muonTrack->SetTrackParamAtVertex(trackParam);
228 AddMuonTrackReference(muonTrack);
229 muonTrack->ResetTrackParamAtHit();
230 muonTrack->ResetHitForRecAtHit();
232 } // end while isNewTrack
238 ReconstructibleTracks();
246 //____________________________________________________________________________
247 TClonesArray* AliMUONRecoCheck::GetTrackReco()
249 /// Return TClonesArray of reconstructed tracks
251 GetMUONData()->ResetRecTracks();
252 GetMUONData()->SetTreeAddress("RT");
253 fTrackReco = GetMUONData()->RecTracks();
254 GetMUONData()->GetRecTracks();
255 fRecoTracks = fTrackReco->GetEntriesFast();
258 //_____________________________________________________________________________
259 void AliMUONRecoCheck::PrintEvent() const
264 AliMUONHitForRec *hitForRec;
265 TClonesArray * hitForRecAtHit = 0;
266 Float_t xRec,yRec,zRec;
268 Int_t nTrackRef = fMuonTrackRef->GetEntriesFast();
270 printf(" ******************************* \n");
271 printf(" nb of tracks %d \n",nTrackRef);
273 for (Int_t index = 0; index < nTrackRef; index++) {
274 track = (AliMUONTrack*)fMuonTrackRef->At(index);
275 hitForRecAtHit = track->GetHitForRecAtHit();
276 Int_t nTrackHits = hitForRecAtHit->GetEntriesFast();
277 printf(" track number %d \n",index);
278 for (Int_t iHit = 0; iHit < nTrackHits; iHit++){
279 hitForRec = (AliMUONHitForRec*) hitForRecAtHit->At(iHit);
280 xRec = hitForRec->GetNonBendingCoor();
281 yRec = hitForRec->GetBendingCoor();
282 zRec = hitForRec->GetZ();
283 printf(" x,y,z: %f , %f , %f \n",xRec,yRec,zRec);
288 //_____________________________________________________________________________
289 void AliMUONRecoCheck::ResetTracks() const
293 if (fMuonTrackRef) fMuonTrackRef->Clear();
295 //_____________________________________________________________________________
296 void AliMUONRecoCheck::CleanMuonTrackRef()
298 /// Re-calculate hits parameters because two AliTrackReferences are recorded for
299 /// each chamber (one when particle is entering + one when particle is leaving
300 /// the sensitive volume)
302 Float_t maxGasGap = 1.; // cm
303 AliMUONTrack *track, *trackNew;
304 AliMUONHitForRec *hitForRec, *hitForRec1, *hitForRec2;
305 AliMUONTrackParam *trackParam, *trackParam1, *trackParam2, *trackParamAtVertex;
306 TClonesArray * hitForRecAtHit = 0;
307 TClonesArray * trackParamAtHit = 0;
308 Float_t xRec,yRec,zRec;
309 Float_t xRec1,yRec1,zRec1;
310 Float_t xRec2,yRec2,zRec2;
311 Float_t bendingSlope,nonBendingSlope,bendingMomentum;
312 Float_t bendingSlope1,nonBendingSlope1,bendingMomentum1;
313 Float_t bendingSlope2,nonBendingSlope2,bendingMomentum2;
314 TClonesArray *newMuonTrackRef = new TClonesArray("AliMUONTrack", 10);
318 Int_t nTrackHits = 0;
320 hitForRec = new AliMUONHitForRec();
321 trackParam = new AliMUONTrackParam();
322 trackNew = new AliMUONTrack();
324 Int_t nTrackRef = fMuonTrackRef->GetEntriesFast();
326 for (Int_t index = 0; index < nTrackRef; index++) {
327 track = (AliMUONTrack*)fMuonTrackRef->At(index);
328 hitForRecAtHit = track->GetHitForRecAtHit();
329 trackParamAtHit = track->GetTrackParamAtHit();
330 trackParamAtVertex = track->GetTrackParamAtVertex();
331 nTrackHits = hitForRecAtHit->GetEntriesFast();
333 while (iHit1 < nTrackHits) {
334 hitForRec1 = (AliMUONHitForRec*) hitForRecAtHit->At(iHit1);
335 trackParam1 = (AliMUONTrackParam*) trackParamAtHit->At(iHit1);
336 xRec1 = hitForRec1->GetNonBendingCoor();
337 yRec1 = hitForRec1->GetBendingCoor();
338 zRec1 = hitForRec1->GetZ();
342 bendingSlope1 = trackParam1->GetBendingSlope();
343 nonBendingSlope1 = trackParam1->GetNonBendingSlope();
344 bendingMomentum1 = 0;
345 if (TMath::Abs(trackParam1->GetInverseBendingMomentum()) > 0)
346 bendingMomentum1 = 1./trackParam1->GetInverseBendingMomentum();
347 bendingSlope = bendingSlope1;
348 nonBendingSlope = nonBendingSlope1;
349 bendingMomentum = bendingMomentum1;
351 for (Int_t iHit2 = iHit1+1; iHit2 < nTrackHits; iHit2++) {
352 hitForRec2 = (AliMUONHitForRec*) hitForRecAtHit->At(iHit2);
353 trackParam2 = (AliMUONTrackParam*) trackParamAtHit->At(iHit2);
354 xRec2 = hitForRec2->GetNonBendingCoor();
355 yRec2 = hitForRec2->GetBendingCoor();
356 zRec2 = hitForRec2->GetZ();
357 bendingSlope2 = trackParam2->GetBendingSlope();
358 nonBendingSlope2 = trackParam2->GetNonBendingSlope();
359 bendingMomentum2 = 0;
360 if (TMath::Abs(trackParam2->GetInverseBendingMomentum()) > 0)
361 bendingMomentum2 = 1./trackParam2->GetInverseBendingMomentum();
363 if ( TMath::Abs(zRec2-zRec1) < maxGasGap ) {
368 bendingSlope += bendingSlope2;
369 nonBendingSlope += nonBendingSlope2;
370 bendingMomentum += bendingMomentum2;
375 xRec /= (Float_t)nRec;
376 yRec /= (Float_t)nRec;
377 zRec /= (Float_t)nRec;
378 bendingSlope /= (Float_t)nRec;
379 nonBendingSlope /= (Float_t)nRec;
380 bendingMomentum /= (Float_t)nRec;
382 hitForRec->SetNonBendingCoor(xRec);
383 hitForRec->SetBendingCoor(yRec);
384 hitForRec->SetZ(zRec);
385 iChamber = AliMUONConstants::ChamberNumber(zRec);
386 hitForRec->SetChamberNumber(iChamber);
387 hitForRec->SetBendingReso2(0.0);
388 hitForRec->SetNonBendingReso2(0.0);
389 trackParam->SetNonBendingCoor(xRec);
390 trackParam->SetBendingCoor(yRec);
391 trackParam->SetZ(zRec);
392 trackParam->SetNonBendingSlope(nonBendingSlope);
393 trackParam->SetBendingSlope(bendingSlope);
394 if (TMath::Abs(bendingMomentum) > 0)
395 trackParam->SetInverseBendingMomentum(1./bendingMomentum);
397 trackNew->AddHitForRecAtHit(hitForRec);
398 trackNew->AddTrackParamAtHit(trackParam);
403 trackNew->SetTrackID(track->GetTrackID());
404 trackNew->SetTrackParamAtVertex(trackParamAtVertex);
405 {new ((*newMuonTrackRef)[newMuonTrackRef->GetEntriesFast()]) AliMUONTrack(*trackNew);}
406 trackNew->ResetHitForRecAtHit();
407 trackNew->ResetTrackParamAtHit();
411 fMuonTrackRef->Clear();
412 nTrackRef = newMuonTrackRef->GetEntriesFast();
413 for (Int_t index = 0; index < nTrackRef; index++) {
414 track = (AliMUONTrack*)newMuonTrackRef->At(index);
415 AddMuonTrackReference(track);
422 newMuonTrackRef->Delete();
423 delete newMuonTrackRef;
427 //_____________________________________________________________________________
428 void AliMUONRecoCheck::ReconstructibleTracks()
430 /// Calculate the number of reconstructible tracks
433 TClonesArray* hitForRecAtHit = NULL;
434 AliMUONHitForRec* hitForRec;
436 Int_t nTrackRef, nTrackHits;
437 Int_t isChamberInTrack[10];
439 Bool_t isTrackOK = kTRUE;
441 fReconstructibleTracks = 0;
443 nTrackRef = fMuonTrackRef->GetEntriesFast();
444 for (Int_t index = 0; index < nTrackRef; index++) {
445 track = (AliMUONTrack*)fMuonTrackRef->At(index);
446 hitForRecAtHit = track->GetHitForRecAtHit();
447 nTrackHits = hitForRecAtHit->GetEntriesFast();
448 for (Int_t ch = 0; ch < 10; ch++) isChamberInTrack[ch] = 0;
450 for ( Int_t iHit = 0; iHit < nTrackHits; iHit++) {
451 hitForRec = (AliMUONHitForRec*) hitForRecAtHit->At(iHit);
452 zRec = hitForRec->GetZ();
453 iChamber = hitForRec->GetChamberNumber();
454 if (iChamber < 0 || iChamber > 10) continue;
455 isChamberInTrack[iChamber] = 1;
458 // track is reconstructible if the particle is crossing every tracking chambers
460 for (Int_t ch = 0; ch < 10; ch++) {
461 if (!isChamberInTrack[ch]) isTrackOK = kFALSE;
462 } if (isTrackOK) fReconstructibleTracks++;
463 if (!isTrackOK) fMuonTrackRef->Remove(track); // remove non reconstructible tracks
465 fMuonTrackRef->Compress();