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 /// Utility class to check reconstruction
21 /// Reconstructed tracks are compared to reference tracks.
22 /// The reference tracks are built from AliTrackReference for the
23 /// hit in chamber (0..9) and from kinematics for the vertex parameters.
24 //-----------------------------------------------------------------------------
27 // Added a method to create a list of reconstructed AliMUONTrack objects from
28 // ESD data. This is necessary since the track objects that are actually created
29 // during offline reconstruction are no longer stored to disk.
30 // - Artur Szostak <artursz@iafrica.com>
32 // Use the new ESDInterface to create MUON objects from ESD data
36 #include "AliMUONRecoCheck.h"
37 #include "AliMUONTrack.h"
38 #include "AliMUONVTrackStore.h"
39 #include "AliMUONVCluster.h"
40 #include "AliMUONVClusterStore.h"
41 #include "AliMUONConstants.h"
42 #include "AliMUONESDInterface.h"
43 #include "AliMUONTrackParam.h"
44 #include "AliMCEventHandler.h"
45 #include "AliMCEvent.h"
47 #include "AliTrackReference.h"
49 #include "AliESDEvent.h"
50 #include "AliESDMuonTrack.h"
54 #include <TParticle.h>
55 #include <TParticlePDG.h>
56 #include <Riostream.h>
59 ClassImp(AliMUONRecoCheck)
62 //_____________________________________________________________________________
63 AliMUONRecoCheck::AliMUONRecoCheck(const Char_t *esdFileName, const Char_t *pathSim)
65 fMCEventHandler(new AliMCEventHandler()),
66 fESDEvent(new AliESDEvent()),
71 fRecoTrackRefStore(0x0),
77 // TrackRefs and Particules
78 fMCEventHandler->SetInputPath(pathSim);
79 fMCEventHandler->InitIO("");
82 fESDFile = TFile::Open(esdFileName); // open the file
83 if (!fESDFile || !fESDFile->IsOpen()) {
84 AliError(Form("opening ESD file %s failed", esdFileName));
88 fESDTree = (TTree*) fESDFile->Get("esdTree"); // get the tree
90 AliError("no ESD tree found");
95 fESDEvent->ReadFromTree(fESDTree); // link fESDEvent to the tree
98 //_____________________________________________________________________________
99 AliMUONRecoCheck::AliMUONRecoCheck(AliESDEvent *esdEvent, AliMCEventHandler *mcEventHandler)
107 fRecoTrackRefStore(0x0),
108 fRecoTrackStore(0x0),
109 fESDEventOwner(kFALSE)
113 // TrackRefs and Particules
114 fMCEventHandler = mcEventHandler;
117 fESDEvent = esdEvent;
121 //_____________________________________________________________________________
122 AliMUONRecoCheck::~AliMUONRecoCheck()
125 if (fESDEventOwner) {
126 delete fMCEventHandler;
128 if (fESDFile) fESDFile->Close();
133 //_____________________________________________________________________________
134 void AliMUONRecoCheck::ResetStores()
136 /// Deletes all the store objects that have been created and resets the pointers to 0x0
137 delete fTrackRefStore; fTrackRefStore = 0x0;
138 delete fRecoTrackRefStore; fRecoTrackRefStore = 0x0;
139 delete fRecoTrackStore; fRecoTrackStore = 0x0;
142 //_____________________________________________________________________________
143 Int_t AliMUONRecoCheck::GetRunNumber()
145 /// Return the run number of the current ESD event
147 if (fESDEventOwner && fRecoTrackStore == 0x0) {
148 if (!fESDTree || fESDTree->GetEvent(fCurrentEvent) <= 0) {
149 AliError(Form("fails to read ESD object for event %d: cannot get the run number",fCurrentEvent));
154 return fESDEvent->GetRunNumber();
157 //_____________________________________________________________________________
158 Int_t AliMUONRecoCheck::NumberOfEvents() const
160 /// Return the number of events
161 if (fESDEventOwner && fESDTree) return fESDTree->GetEntries();
165 //_____________________________________________________________________________
166 AliMUONVTrackStore* AliMUONRecoCheck::ReconstructedTracks(Int_t event, Bool_t refit)
168 /// Return a track store containing the reconstructed tracks (converted into
169 /// MUONTrack objects) for a given event.
170 /// Track parameters at each clusters are computed or not depending on the flag "refit".
171 /// If not, only the track parameters at first cluster are valid.
173 if (!fESDEventOwner) {
174 if (fRecoTrackStore == 0x0) MakeReconstructedTracks(refit);
175 return fRecoTrackStore;
178 if (event != fCurrentEvent) {
180 fCurrentEvent = event;
183 if (fRecoTrackStore != 0x0) return fRecoTrackStore;
185 if (!fESDTree) return 0x0;
186 if (fESDTree->GetEvent(event) <= 0) {
187 AliError(Form("fails to read ESD object for event %d", event));
190 MakeReconstructedTracks(refit);
191 return fRecoTrackStore;
195 //_____________________________________________________________________________
196 AliMUONVTrackStore* AliMUONRecoCheck::TrackRefs(Int_t event)
198 /// Return a track store containing the track references (converted into
199 /// MUONTrack objects) for a given event
201 if (!fESDEventOwner) {
202 if (fTrackRefStore == 0x0) MakeTrackRefs();
203 return fTrackRefStore;
206 if (event != fCurrentEvent) {
208 fCurrentEvent = event;
211 if (fTrackRefStore != 0x0) return fTrackRefStore;
213 if (!fMCEventHandler->GetEvent(event)) {
214 AliError(Form("fails to read MC objects for event %d", event));
218 return fTrackRefStore;
222 //_____________________________________________________________________________
223 AliMUONVTrackStore* AliMUONRecoCheck::ReconstructibleTracks(Int_t event)
225 /// Return a track store containing the reconstructible tracks for a given event
227 if (!fESDEventOwner) {
228 if (fRecoTrackRefStore == 0x0) {
229 if (TrackRefs(event) == 0x0) return 0x0;
230 MakeReconstructibleTracks();
232 return fRecoTrackRefStore;
235 if (event != fCurrentEvent) {
237 fCurrentEvent = event;
240 if (fRecoTrackRefStore != 0x0) return fRecoTrackRefStore;
242 if (TrackRefs(event) == 0x0) return 0x0;
243 MakeReconstructibleTracks();
244 return fRecoTrackRefStore;
248 //_____________________________________________________________________________
249 void AliMUONRecoCheck::MakeReconstructedTracks(Bool_t refit)
251 /// Make reconstructed tracks
252 if (!(fRecoTrackStore = AliMUONESDInterface::NewTrackStore())) return;
254 // loop over all reconstructed tracks and add them to the store (skip ghosts)
255 Int_t nTracks = (Int_t) fESDEvent->GetNumberOfMuonTracks();
256 for (Int_t iTrack = 0; iTrack < nTracks; iTrack++) {
257 AliESDMuonTrack* esdTrack = fESDEvent->GetMuonTrack(iTrack);
258 if (esdTrack->ContainTrackerData()) AliMUONESDInterface::Add(*esdTrack, *fRecoTrackStore, refit);
263 //_____________________________________________________________________________
264 void AliMUONRecoCheck::MakeTrackRefs()
266 /// Make reconstructible tracks
267 AliMUONVTrackStore *tmpTrackRefStore = AliMUONESDInterface::NewTrackStore();
268 if (!tmpTrackRefStore) return;
270 Double_t x, y, z, pX, pY, pZ, bendingSlope, nonBendingSlope, inverseBendingMomentum;
272 TClonesArray* trackRefs;
273 Int_t nTrackRef = fMCEventHandler->MCEvent()->GetNumberOfTracks();
274 AliMUONVClusterStore* cStore = AliMUONESDInterface::NewClusterStore();
276 AliMUONVCluster* hit = cStore->CreateCluster(0,0,0);
278 // loop over simulated tracks
279 for (Int_t iTrackRef = 0; iTrackRef < nTrackRef; ++iTrackRef) {
280 Int_t nHits = fMCEventHandler->GetParticleAndTR(iTrackRef, particle, trackRefs);
282 // skip empty trackRefs
283 if (nHits < 1) continue;
285 // get the particle charge for further calculation
286 TParticlePDG* ppdg = particle->GetPDG();
287 Int_t charge = ppdg != NULL ? (Int_t)(ppdg->Charge()/3.0) : 0;
291 // loop over simulated track hits
292 for (Int_t iHit = 0; iHit < nHits; ++iHit) {
293 AliTrackReference* trackReference = static_cast<AliTrackReference*>(trackRefs->UncheckedAt(iHit));
295 // skip trackRefs not in MUON
296 if (trackReference->DetectorId() != AliTrackReference::kMUON) continue;
298 // Get track parameters of current hit
299 x = trackReference->X();
300 y = trackReference->Y();
301 z = trackReference->Z();
302 pX = trackReference->Px();
303 pY = trackReference->Py();
304 pZ = trackReference->Pz();
306 // check chamberId of current trackReference
307 Int_t detElemId = trackReference->UserId();
308 Int_t chamberId = detElemId / 100 - 1;
309 if (chamberId < 0 || chamberId >= AliMUONConstants::NTrackingCh()) continue;
311 // set hit parameters
312 hit->SetUniqueID(AliMUONVCluster::BuildUniqueID(chamberId, detElemId, iHit));
314 hit->SetErrXY(0.,0.);
316 // compute track parameters at hit
319 inverseBendingMomentum = 0;
320 if (TMath::Abs(pZ) > 0) {
321 bendingSlope = pY/pZ;
322 nonBendingSlope = pX/pZ;
324 Double_t pYZ = TMath::Sqrt(pY*pY+pZ*pZ);
325 if (pYZ >0) inverseBendingMomentum = 1/pYZ;
326 inverseBendingMomentum *= charge;
328 // set track parameters at hit
329 AliMUONTrackParam trackParam;
330 trackParam.SetNonBendingCoor(x);
331 trackParam.SetBendingCoor(y);
333 trackParam.SetBendingSlope(bendingSlope);
334 trackParam.SetNonBendingSlope(nonBendingSlope);
335 trackParam.SetInverseBendingMomentum(inverseBendingMomentum);
337 // add track parameters at current hit to the track
338 track.AddTrackParamAtCluster(trackParam, *hit, kTRUE);
341 // if none of the track hits was in MUON, goto the next track
342 if (track.GetNClusters() < 1) continue;
344 // get track parameters at particle's vertex
352 // compute rest of track parameters at particle's vertex
355 inverseBendingMomentum = 0;
356 if (TMath::Abs(pZ) > 0) {
357 bendingSlope = pY/pZ;
358 nonBendingSlope = pX/pZ;
360 Double_t pYZ = TMath::Sqrt(pY*pY+pZ*pZ);
361 if (pYZ >0) inverseBendingMomentum = 1/pYZ;
362 inverseBendingMomentum *= charge;
364 // set track parameters at particle's vertex
365 AliMUONTrackParam trackParamAtVertex;
366 trackParamAtVertex.SetNonBendingCoor(x);
367 trackParamAtVertex.SetBendingCoor(y);
368 trackParamAtVertex.SetZ(z);
369 trackParamAtVertex.SetBendingSlope(bendingSlope);
370 trackParamAtVertex.SetNonBendingSlope(nonBendingSlope);
371 trackParamAtVertex.SetInverseBendingMomentum(inverseBendingMomentum);
373 // add track parameters at vertex
374 track.SetTrackParamAtVertex(&trackParamAtVertex);
377 track.SetUniqueID(iTrackRef);
378 tmpTrackRefStore->Add(track);
381 CleanMuonTrackRef(tmpTrackRefStore);
385 delete tmpTrackRefStore;
388 //_____________________________________________________________________________
389 void AliMUONRecoCheck::CleanMuonTrackRef(const AliMUONVTrackStore *tmpTrackRefStore)
391 /// Re-calculate hits parameters because two AliTrackReferences are recorded for
392 /// each chamber (one when particle is entering + one when particle is leaving
393 /// the sensitive volume)
394 if (!(fTrackRefStore = AliMUONESDInterface::NewTrackStore())) return;
396 Double_t maxGasGap = 1.; // cm
397 Double_t x, y, z, pX, pY, pZ, x1, y1, z1, pX1, pY1, pZ1, z2;
398 Double_t bendingSlope,nonBendingSlope,inverseBendingMomentum;
399 AliMUONVClusterStore* cStore = AliMUONESDInterface::NewClusterStore();
401 AliMUONVCluster* hit = cStore->CreateCluster(0,0,0);
404 TIter next(tmpTrackRefStore->CreateIterator());
406 // loop over tmpTrackRef
408 while ( ( track = static_cast<AliMUONTrack*>(next()) ) ) {
410 AliMUONTrack newTrack;
412 // loop over tmpTrackRef's hits
414 Int_t nTrackHits = track->GetNClusters();
415 while (iHit1 < nTrackHits) {
416 AliMUONTrackParam *trackParam1 = (AliMUONTrackParam*) track->GetTrackParamAtCluster()->UncheckedAt(iHit1);
418 // get track parameters at hit1
419 x1 = trackParam1->GetNonBendingCoor();
420 y1 = trackParam1->GetBendingCoor();
421 z1 = trackParam1->GetZ();
422 pX1 = trackParam1->Px();
423 pY1 = trackParam1->Py();
424 pZ1 = trackParam1->Pz();
426 // prepare new track parameters
434 // loop over next tmpTrackRef's hits
435 Int_t nCombinedHits = 1;
436 for (Int_t iHit2 = iHit1+1; iHit2 < nTrackHits; iHit2++) {
437 AliMUONTrackParam *trackParam2 = (AliMUONTrackParam*) track->GetTrackParamAtCluster()->UncheckedAt(iHit2);
439 // get z position of hit2
440 z2 = trackParam2->GetZ();
442 // complete new track parameters if hit2 is on the same detection element
443 if ( TMath::Abs(z2-z1) < maxGasGap ) {
444 x += trackParam2->GetNonBendingCoor();
445 y += trackParam2->GetBendingCoor();
447 pX += trackParam2->Px();
448 pY += trackParam2->Py();
449 pZ += trackParam2->Pz();
456 // finalize new track parameters
457 x /= (Double_t)nCombinedHits;
458 y /= (Double_t)nCombinedHits;
459 z /= (Double_t)nCombinedHits;
460 pX /= (Double_t)nCombinedHits;
461 pY /= (Double_t)nCombinedHits;
462 pZ /= (Double_t)nCombinedHits;
465 inverseBendingMomentum = 0;
466 if (TMath::Abs(pZ) > 0) {
467 bendingSlope = pY/pZ;
468 nonBendingSlope = pX/pZ;
470 Double_t pYZ = TMath::Sqrt(pY*pY+pZ*pZ);
471 if (pYZ >0) inverseBendingMomentum = 1/pYZ;
472 inverseBendingMomentum *= trackParam1->GetCharge();
474 // set hit parameters
475 hit->SetUniqueID(trackParam1->GetClusterPtr()->GetUniqueID());
477 hit->SetErrXY(0.,0.);
479 // set new track parameters at new hit
480 AliMUONTrackParam trackParam;
481 trackParam.SetNonBendingCoor(x);
482 trackParam.SetBendingCoor(y);
484 trackParam.SetBendingSlope(bendingSlope);
485 trackParam.SetNonBendingSlope(nonBendingSlope);
486 trackParam.SetInverseBendingMomentum(inverseBendingMomentum);
488 // add track parameters at current hit to the track
489 newTrack.AddTrackParamAtCluster(trackParam, *hit, kTRUE);
494 newTrack.SetUniqueID(track->GetUniqueID());
495 newTrack.SetTrackParamAtVertex(track->GetTrackParamAtVertex());
496 fTrackRefStore->Add(newTrack);
504 //_____________________________________________________________________________
505 void AliMUONRecoCheck::MakeReconstructibleTracks()
507 /// Isolate the reconstructible tracks
508 if (!(fRecoTrackRefStore = AliMUONESDInterface::NewTrackStore())) return;
510 // create iterator on trackRef
511 TIter next(fTrackRefStore->CreateIterator());
513 // loop over trackRef
515 while ( ( track = static_cast<AliMUONTrack*>(next()) ) ) {
517 Bool_t* chamberInTrack = new Bool_t(AliMUONConstants::NTrackingCh());
518 for (Int_t iCh = 0; iCh < AliMUONConstants::NTrackingCh(); iCh++) chamberInTrack[iCh] = kFALSE;
520 // loop over trackRef's hits to get hit chambers
521 Int_t nTrackHits = track->GetNClusters();
522 for (Int_t iHit = 0; iHit < nTrackHits; iHit++) {
523 AliMUONVCluster* hit = ((AliMUONTrackParam*) track->GetTrackParamAtCluster()->UncheckedAt(iHit))->GetClusterPtr();
524 chamberInTrack[hit->GetChamberId()] = kTRUE;
527 // track is reconstructible if the particle is depositing a hit
528 // in the following chamber combinations:
529 Bool_t trackOK = kTRUE;
530 if (!chamberInTrack[0] && !chamberInTrack[1]) trackOK = kFALSE;
531 if (!chamberInTrack[2] && !chamberInTrack[3]) trackOK = kFALSE;
532 if (!chamberInTrack[4] && !chamberInTrack[5]) trackOK = kFALSE;
533 Int_t nHitsInLastStations = 0;
534 for (Int_t iCh = 6; iCh < AliMUONConstants::NTrackingCh(); iCh++)
535 if (chamberInTrack[iCh]) nHitsInLastStations++;
536 if(nHitsInLastStations < 3) trackOK = kFALSE;
538 // Add reconstructible tracks to fRecoTrackRefStore
539 if (trackOK) fRecoTrackRefStore->Add(*track);
541 delete [] chamberInTrack;