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 **************************************************************************/
16 //////////////////////////////////////////////////////////////////////////////////////
18 // Utility class to check the muon reconstruction. Reconstructed tracks are compared
19 // to reference tracks. The reference tracks are built from AliTrackReference for the
20 // hit in chamber (0..9) and from kinematics for the vertex parameters.
22 //////////////////////////////////////////////////////////////////////////////////////
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()
84 fRunLoader->UnloadKinematics();
85 fRunLoader->UnloadTrackRefs();
86 fRunLoader->UnloadTracks();
87 fMuonTrackRef->Delete();
92 //________________________________________________________________________
93 AliMUONRecoCheck& AliMUONRecoCheck::operator = (const AliMUONRecoCheck& rhs)
95 // Protected assignement operator
97 if (this == &rhs) return *this;
99 AliFatal("Not implemented.");
104 //_____________________________________________________________________________
105 void AliMUONRecoCheck::MakeTrackRef()
107 // Make reconstructible tracks
109 AliTrackReference *trackReference;
110 AliMUONTrack *muonTrack;
111 AliMUONTrackParam *trackParam;
112 AliMUONHitForRec *hitForRec;
113 Float_t x, y, z, pX, pY, pZ, pYZ;
114 Int_t track, trackSave;
116 Float_t bendingSlope = 0;
117 Float_t nonBendingSlope = 0;
118 Float_t inverseBendingMomentum = 0;
120 TTree* treeTR = fRunLoader->TreeTR();
121 if (treeTR == NULL) return;
123 TBranch* branch = treeTR->GetBranch("MUON");
124 if (branch == NULL) return;
126 TClonesArray* trackRefs = 0;
127 branch->SetAddress(&trackRefs);
128 branch->SetAutoDelete(kTRUE);
130 Int_t nTrackRef = (Int_t)branch->GetEntries();
132 track = trackSave = -999;
134 Int_t iHitMin, iChamber;
136 trackParam = new AliMUONTrackParam();
137 hitForRec = new AliMUONHitForRec();
138 muonTrack = new AliMUONTrack();
140 for (Int_t iTrackRef = 0; iTrackRef < nTrackRef; iTrackRef++) {
141 branch->GetEntry(iTrackRef);
146 if (!trackRefs->GetEntries()) continue;
150 for (Int_t iHit = iHitMin; iHit < trackRefs->GetEntries(); iHit++) {
152 trackReference = (AliTrackReference*)trackRefs->At(iHit);
153 x = trackReference->X();
154 y = trackReference->Y();
155 z = trackReference->Z();
156 pX = trackReference->Px();
157 pY = trackReference->Py();
158 pZ = trackReference->Pz();
160 track = trackReference->GetTrack();
162 if (track != trackSave && iHit != 0) {
168 // track parameters at hit
169 trackParam->SetBendingCoor(y);
170 trackParam->SetNonBendingCoor(x);
173 if (TMath::Abs(pZ) > 0) {
174 bendingSlope = pY/pZ;
175 nonBendingSlope = pX/pZ;
177 pYZ = TMath::Sqrt(pY*pY+pZ*pZ);
178 if (pYZ >0) inverseBendingMomentum = 1/pYZ;
180 trackParam->SetBendingSlope(bendingSlope);
181 trackParam->SetNonBendingSlope(nonBendingSlope);
182 trackParam->SetInverseBendingMomentum(inverseBendingMomentum);
184 hitForRec->SetBendingCoor(y);
185 hitForRec->SetNonBendingCoor(x);
187 hitForRec->SetBendingReso2(0.0);
188 hitForRec->SetNonBendingReso2(0.0);
189 iChamber = AliMUONConstants::ChamberNumber(z);
190 hitForRec->SetChamberNumber(iChamber);
192 muonTrack->AddTrackParamAtHit(trackParam);
193 muonTrack->AddHitForRecAtHit(hitForRec);
194 muonTrack->SetTrackID(track);
197 if (iHit == trackRefs->GetEntries()-1) isNewTrack = kFALSE;
200 // track parameters at vertex
201 particle = fRunLoader->GetHeader()->Stack()->Particle(muonTrack->GetTrackID());
210 trackParam->SetBendingCoor(y);
211 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;
219 trackParam->SetBendingSlope(bendingSlope);
220 trackParam->SetNonBendingSlope(nonBendingSlope);
221 trackParam->SetInverseBendingMomentum(inverseBendingMomentum);
223 muonTrack->SetTrackParamAtVertex(trackParam);
226 AddMuonTrackReference(muonTrack);
227 muonTrack->ResetTrackParamAtHit();
228 muonTrack->ResetHitForRecAtHit();
230 } // end while isNewTrack
236 ReconstructibleTracks();
244 //____________________________________________________________________________
245 TClonesArray* AliMUONRecoCheck::GetTrackReco()
247 // Return TClonesArray of reconstructed tracks
249 GetMUONData()->ResetRecTracks();
250 GetMUONData()->SetTreeAddress("RT");
251 fTrackReco = GetMUONData()->RecTracks();
252 GetMUONData()->GetRecTracks();
253 fRecoTracks = fTrackReco->GetEntriesFast();
256 //_____________________________________________________________________________
257 void AliMUONRecoCheck::PrintEvent() const
262 AliMUONHitForRec *hitForRec;
263 TClonesArray * hitForRecAtHit = 0;
264 Float_t xRec,yRec,zRec;
266 Int_t nTrackRef = fMuonTrackRef->GetEntriesFast();
268 printf(" ******************************* \n");
269 printf(" nb of tracks %d \n",nTrackRef);
271 for (Int_t index = 0; index < nTrackRef; index++) {
272 track = (AliMUONTrack*)fMuonTrackRef->At(index);
273 hitForRecAtHit = track->GetHitForRecAtHit();
274 Int_t nTrackHits = hitForRecAtHit->GetEntriesFast();
275 printf(" track number %d \n",index);
276 for (Int_t iHit = 0; iHit < nTrackHits; iHit++){
277 hitForRec = (AliMUONHitForRec*) hitForRecAtHit->At(iHit);
278 xRec = hitForRec->GetNonBendingCoor();
279 yRec = hitForRec->GetBendingCoor();
280 zRec = hitForRec->GetZ();
281 printf(" x,y,z: %f , %f , %f \n",xRec,yRec,zRec);
286 //_____________________________________________________________________________
287 void AliMUONRecoCheck::ResetTracks() const
289 if (fMuonTrackRef) fMuonTrackRef->Clear();
291 //_____________________________________________________________________________
292 void AliMUONRecoCheck::CleanMuonTrackRef()
294 // Re-calculate hits parameters because two AliTrackReferences are recorded for
295 // each chamber (one when particle is entering + one when particle is leaving
296 // the sensitive volume)
298 Float_t maxGasGap = 1.; // cm
299 AliMUONTrack *track, *trackNew;
300 AliMUONHitForRec *hitForRec, *hitForRec1, *hitForRec2;
301 AliMUONTrackParam *trackParam, *trackParam1, *trackParam2, *trackParamAtVertex;
302 TClonesArray * hitForRecAtHit = 0;
303 TClonesArray * trackParamAtHit = 0;
304 Float_t xRec,yRec,zRec;
305 Float_t xRec1,yRec1,zRec1;
306 Float_t xRec2,yRec2,zRec2;
307 Float_t bendingSlope,nonBendingSlope,bendingMomentum;
308 Float_t bendingSlope1,nonBendingSlope1,bendingMomentum1;
309 Float_t bendingSlope2,nonBendingSlope2,bendingMomentum2;
310 TClonesArray *newMuonTrackRef = new TClonesArray("AliMUONTrack", 10);
314 Int_t nTrackHits = 0;
316 hitForRec = new AliMUONHitForRec();
317 trackParam = new AliMUONTrackParam();
318 trackNew = new AliMUONTrack();
320 Int_t nTrackRef = fMuonTrackRef->GetEntriesFast();
322 for (Int_t index = 0; index < nTrackRef; index++) {
323 track = (AliMUONTrack*)fMuonTrackRef->At(index);
324 hitForRecAtHit = track->GetHitForRecAtHit();
325 trackParamAtHit = track->GetTrackParamAtHit();
326 trackParamAtVertex = track->GetTrackParamAtVertex();
327 nTrackHits = hitForRecAtHit->GetEntriesFast();
329 while (iHit1 < nTrackHits) {
330 hitForRec1 = (AliMUONHitForRec*) hitForRecAtHit->At(iHit1);
331 trackParam1 = (AliMUONTrackParam*) trackParamAtHit->At(iHit1);
332 xRec1 = hitForRec1->GetNonBendingCoor();
333 yRec1 = hitForRec1->GetBendingCoor();
334 zRec1 = hitForRec1->GetZ();
338 bendingSlope1 = trackParam1->GetBendingSlope();
339 nonBendingSlope1 = trackParam1->GetNonBendingSlope();
340 bendingMomentum1 = 0;
341 if (TMath::Abs(trackParam1->GetInverseBendingMomentum()) > 0)
342 bendingMomentum1 = 1./trackParam1->GetInverseBendingMomentum();
343 bendingSlope = bendingSlope1;
344 nonBendingSlope = nonBendingSlope1;
345 bendingMomentum = bendingMomentum1;
347 for (Int_t iHit2 = iHit1+1; iHit2 < nTrackHits; iHit2++) {
348 hitForRec2 = (AliMUONHitForRec*) hitForRecAtHit->At(iHit2);
349 trackParam2 = (AliMUONTrackParam*) trackParamAtHit->At(iHit2);
350 xRec2 = hitForRec2->GetNonBendingCoor();
351 yRec2 = hitForRec2->GetBendingCoor();
352 zRec2 = hitForRec2->GetZ();
353 bendingSlope2 = trackParam2->GetBendingSlope();
354 nonBendingSlope2 = trackParam2->GetNonBendingSlope();
355 bendingMomentum2 = 0;
356 if (TMath::Abs(trackParam2->GetInverseBendingMomentum()) > 0)
357 bendingMomentum2 = 1./trackParam2->GetInverseBendingMomentum();
359 if ( TMath::Abs(zRec2-zRec1) < maxGasGap ) {
364 bendingSlope += bendingSlope2;
365 nonBendingSlope += nonBendingSlope2;
366 bendingMomentum += bendingMomentum2;
371 xRec /= (Float_t)nRec;
372 yRec /= (Float_t)nRec;
373 zRec /= (Float_t)nRec;
374 bendingSlope /= (Float_t)nRec;
375 nonBendingSlope /= (Float_t)nRec;
376 bendingMomentum /= (Float_t)nRec;
378 hitForRec->SetNonBendingCoor(xRec);
379 hitForRec->SetBendingCoor(yRec);
380 hitForRec->SetZ(zRec);
381 iChamber = AliMUONConstants::ChamberNumber(zRec);
382 hitForRec->SetChamberNumber(iChamber);
383 hitForRec->SetBendingReso2(0.0);
384 hitForRec->SetNonBendingReso2(0.0);
385 trackParam->SetNonBendingCoor(xRec);
386 trackParam->SetBendingCoor(yRec);
387 trackParam->SetZ(zRec);
388 trackParam->SetNonBendingSlope(nonBendingSlope);
389 trackParam->SetBendingSlope(bendingSlope);
390 if (TMath::Abs(bendingMomentum) > 0)
391 trackParam->SetInverseBendingMomentum(1./bendingMomentum);
393 trackNew->AddHitForRecAtHit(hitForRec);
394 trackNew->AddTrackParamAtHit(trackParam);
399 trackNew->SetTrackID(track->GetTrackID());
400 trackNew->SetTrackParamAtVertex(trackParamAtVertex);
401 {new ((*newMuonTrackRef)[newMuonTrackRef->GetEntriesFast()]) AliMUONTrack(*trackNew);}
402 trackNew->ResetHitForRecAtHit();
403 trackNew->ResetTrackParamAtHit();
407 fMuonTrackRef->Clear();
408 nTrackRef = newMuonTrackRef->GetEntriesFast();
409 for (Int_t index = 0; index < nTrackRef; index++) {
410 track = (AliMUONTrack*)newMuonTrackRef->At(index);
411 AddMuonTrackReference(track);
418 newMuonTrackRef->Delete();
419 delete newMuonTrackRef;
423 //_____________________________________________________________________________
424 void AliMUONRecoCheck::ReconstructibleTracks()
426 // calculate the number of reconstructible tracks
429 TClonesArray* hitForRecAtHit = NULL;
430 AliMUONHitForRec* hitForRec;
432 Int_t nTrackRef, nTrackHits;
433 Int_t isChamberInTrack[10];
435 Bool_t isTrackOK = kTRUE;
437 fReconstructibleTracks = 0;
439 nTrackRef = fMuonTrackRef->GetEntriesFast();
440 for (Int_t index = 0; index < nTrackRef; index++) {
441 track = (AliMUONTrack*)fMuonTrackRef->At(index);
442 hitForRecAtHit = track->GetHitForRecAtHit();
443 nTrackHits = hitForRecAtHit->GetEntriesFast();
444 for (Int_t ch = 0; ch < 10; ch++) isChamberInTrack[ch] = 0;
446 for ( Int_t iHit = 0; iHit < nTrackHits; iHit++) {
447 hitForRec = (AliMUONHitForRec*) hitForRecAtHit->At(iHit);
448 zRec = hitForRec->GetZ();
449 iChamber = hitForRec->GetChamberNumber();
450 if (iChamber < 0 || iChamber > 10) continue;
451 isChamberInTrack[iChamber] = 1;
454 // track is reconstructible if the particle is crossing every tracking chambers
456 for (Int_t ch = 0; ch < 10; ch++) {
457 if (!isChamberInTrack[ch]) isTrackOK = kFALSE;
458 } if (isTrackOK) fReconstructibleTracks++;
459 if (!isTrackOK) fMuonTrackRef->Remove(track); // remove non reconstructible tracks
461 fMuonTrackRef->Compress();