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
35 #include "AliMUONRecoCheck.h"
36 #include "AliMUONTrack.h"
37 #include "AliMUONVTrackStore.h"
38 #include "AliMUONVCluster.h"
39 #include "AliMUONVClusterStore.h"
40 #include "AliMUONConstants.h"
41 #include "AliMUONESDInterface.h"
42 #include "AliMCEventHandler.h"
43 #include "AliMCEvent.h"
45 #include "AliTrackReference.h"
47 #include "AliESDEvent.h"
48 #include "AliESDMuonTrack.h"
52 #include <TParticle.h>
53 #include <TParticlePDG.h>
54 #include <Riostream.h>
57 ClassImp(AliMUONRecoCheck)
60 //_____________________________________________________________________________
61 AliMUONRecoCheck::AliMUONRecoCheck(Char_t *esdFileName, Char_t *pathSim)
63 fMCEventHandler(new AliMCEventHandler()),
64 fESDEvent(new AliESDEvent()),
69 fRecoTrackRefStore(0x0),
74 // TrackRefs and Particules
75 fMCEventHandler->SetInputPath(pathSim);
76 fMCEventHandler->InitIO("");
79 fESDFile = TFile::Open(esdFileName); // open the file
80 if (!fESDFile || !fESDFile->IsOpen()) {
81 AliError(Form("opening ESD file %s failed", esdFileName));
85 fESDTree = (TTree*) fESDFile->Get("esdTree"); // get the tree
87 AliError("no ESD tree found");
92 fESDEvent->ReadFromTree(fESDTree); // link fESDEvent to the tree
95 //_____________________________________________________________________________
96 AliMUONRecoCheck::~AliMUONRecoCheck()
99 delete fMCEventHandler;
101 if (fESDFile) fESDFile->Close();
105 //_____________________________________________________________________________
106 void AliMUONRecoCheck::ResetStores()
108 /// Deletes all the store objects that have been created and resets the pointers to 0x0
109 delete fTrackRefStore; fTrackRefStore = 0x0;
110 delete fRecoTrackRefStore; fRecoTrackRefStore = 0x0;
111 delete fRecoTrackStore; fRecoTrackStore = 0x0;
114 //_____________________________________________________________________________
115 Int_t AliMUONRecoCheck::NumberOfEvents() const
117 /// Return the number of events
118 if (fESDTree) return fESDTree->GetEntries();
122 //_____________________________________________________________________________
123 AliMUONVTrackStore* AliMUONRecoCheck::ReconstructedTracks(Int_t event)
125 /// Return a track store containing the reconstructed tracks (converted into
126 /// MUONTrack objects) for a given event
127 if (event != fCurrentEvent) {
129 fCurrentEvent = event;
132 if (fRecoTrackStore != 0x0) return fRecoTrackStore;
134 if (!fESDTree) return 0x0;
135 if (fESDTree->GetEvent(event) <= 0) {
136 AliError(Form("fails to read ESD object for event %d", event));
139 MakeReconstructedTracks();
140 return fRecoTrackStore;
144 //_____________________________________________________________________________
145 AliMUONVTrackStore* AliMUONRecoCheck::TrackRefs(Int_t event)
147 /// Return a track store containing the track references (converted into
148 /// MUONTrack objects) for a given event
149 if (event != fCurrentEvent) {
151 fCurrentEvent = event;
154 if (fTrackRefStore != 0x0) return fTrackRefStore;
156 if (!fMCEventHandler->GetEvent(event)) {
157 AliError(Form("fails to read MC objects for event %d", event));
161 return fTrackRefStore;
165 //_____________________________________________________________________________
166 AliMUONVTrackStore* AliMUONRecoCheck::ReconstructibleTracks(Int_t event)
168 /// Return a track store containing the reconstructible tracks for a given event
169 if (event != fCurrentEvent) {
171 fCurrentEvent = event;
174 if (fRecoTrackRefStore != 0x0) return fRecoTrackRefStore;
176 if (TrackRefs(event) == 0x0) return 0x0;
177 MakeReconstructibleTracks();
178 return fRecoTrackRefStore;
182 //_____________________________________________________________________________
183 void AliMUONRecoCheck::MakeReconstructedTracks()
185 /// Make reconstructed tracks
186 if (!(fRecoTrackStore = AliMUONESDInterface::NewTrackStore())) return;
188 // loop over all reconstructed tracks and add them to the store (skip ghosts)
189 Int_t nTracks = (Int_t) fESDEvent->GetNumberOfMuonTracks();
190 for (Int_t iTrack = 0; iTrack < nTracks; iTrack++) {
191 AliESDMuonTrack* esdTrack = fESDEvent->GetMuonTrack(iTrack);
192 if (esdTrack->ContainTrackerData()) AliMUONESDInterface::Add(*esdTrack, *fRecoTrackStore);
197 //_____________________________________________________________________________
198 void AliMUONRecoCheck::MakeTrackRefs()
200 /// Make reconstructible tracks
201 AliMUONVTrackStore *tmpTrackRefStore = AliMUONESDInterface::NewTrackStore();
202 if (!tmpTrackRefStore) return;
204 Double_t x, y, z, pX, pY, pZ, bendingSlope, nonBendingSlope, inverseBendingMomentum;
206 TClonesArray* trackRefs;
207 Int_t nTrackRef = fMCEventHandler->MCEvent()->GetNumberOfTracks();
208 AliMUONVClusterStore* cStore = AliMUONESDInterface::NewClusterStore();
210 AliMUONVCluster* hit = cStore->CreateCluster(0,0,0);
212 // loop over simulated tracks
213 for (Int_t iTrackRef = 0; iTrackRef < nTrackRef; ++iTrackRef) {
214 Int_t nHits = fMCEventHandler->GetParticleAndTR(iTrackRef, particle, trackRefs);
216 // skip empty trackRefs
217 if (nHits < 1) continue;
219 // get the particle charge for further calculation
220 TParticlePDG* ppdg = particle->GetPDG();
221 Int_t charge = ppdg != NULL ? (Int_t)(ppdg->Charge()/3.0) : 0;
225 // loop over simulated track hits
226 for (Int_t iHit = 0; iHit < nHits; ++iHit) {
227 AliTrackReference* trackReference = static_cast<AliTrackReference*>(trackRefs->UncheckedAt(iHit));
229 // skip trackRefs not in MUON
230 if (trackReference->DetectorId() != AliTrackReference::kMUON) continue;
232 // Get track parameters of current hit
233 x = trackReference->X();
234 y = trackReference->Y();
235 z = trackReference->Z();
236 pX = trackReference->Px();
237 pY = trackReference->Py();
238 pZ = trackReference->Pz();
240 // check chamberId of current trackReference
241 Int_t chamberId = AliMUONConstants::ChamberNumber(z);
242 if (chamberId < 0 || chamberId >= AliMUONConstants::NTrackingCh()) continue;
244 // set hit parameters
245 hit->SetUniqueID(AliMUONVCluster::BuildUniqueID(chamberId, 0, 0));
247 hit->SetErrXY(0.,0.);
249 // compute track parameters at hit
252 inverseBendingMomentum = 0;
253 if (TMath::Abs(pZ) > 0) {
254 bendingSlope = pY/pZ;
255 nonBendingSlope = pX/pZ;
257 Double_t pYZ = TMath::Sqrt(pY*pY+pZ*pZ);
258 if (pYZ >0) inverseBendingMomentum = 1/pYZ;
259 inverseBendingMomentum *= charge;
261 // set track parameters at hit
262 AliMUONTrackParam trackParam;
263 trackParam.SetNonBendingCoor(x);
264 trackParam.SetBendingCoor(y);
266 trackParam.SetBendingSlope(bendingSlope);
267 trackParam.SetNonBendingSlope(nonBendingSlope);
268 trackParam.SetInverseBendingMomentum(inverseBendingMomentum);
270 // add track parameters at current hit to the track
271 track.AddTrackParamAtCluster(trackParam, *hit, kTRUE);
274 // if none of the track hits was in MUON, goto the next track
275 if (track.GetNClusters() < 1) continue;
277 // get track parameters at particle's vertex
285 // compute rest of track parameters at particle's vertex
288 inverseBendingMomentum = 0;
289 if (TMath::Abs(pZ) > 0) {
290 bendingSlope = pY/pZ;
291 nonBendingSlope = pX/pZ;
293 Double_t pYZ = TMath::Sqrt(pY*pY+pZ*pZ);
294 if (pYZ >0) inverseBendingMomentum = 1/pYZ;
295 inverseBendingMomentum *= charge;
297 // set track parameters at particle's vertex
298 AliMUONTrackParam trackParamAtVertex;
299 trackParamAtVertex.SetNonBendingCoor(x);
300 trackParamAtVertex.SetBendingCoor(y);
301 trackParamAtVertex.SetZ(z);
302 trackParamAtVertex.SetBendingSlope(bendingSlope);
303 trackParamAtVertex.SetNonBendingSlope(nonBendingSlope);
304 trackParamAtVertex.SetInverseBendingMomentum(inverseBendingMomentum);
306 // add track parameters at vertex
307 track.SetTrackParamAtVertex(&trackParamAtVertex);
310 track.SetTrackID(iTrackRef);
311 tmpTrackRefStore->Add(track);
314 CleanMuonTrackRef(tmpTrackRefStore);
318 delete tmpTrackRefStore;
321 //_____________________________________________________________________________
322 void AliMUONRecoCheck::CleanMuonTrackRef(const AliMUONVTrackStore *tmpTrackRefStore)
324 /// Re-calculate hits parameters because two AliTrackReferences are recorded for
325 /// each chamber (one when particle is entering + one when particle is leaving
326 /// the sensitive volume)
327 if (!(fTrackRefStore = AliMUONESDInterface::NewTrackStore())) return;
329 Double_t maxGasGap = 1.; // cm
330 Double_t x, y, z, pX, pY, pZ, x1, y1, z1, pX1, pY1, pZ1, z2;
331 Double_t bendingSlope,nonBendingSlope,inverseBendingMomentum;
332 AliMUONVClusterStore* cStore = AliMUONESDInterface::NewClusterStore();
334 AliMUONVCluster* hit = cStore->CreateCluster(0,0,0);
337 TIter next(tmpTrackRefStore->CreateIterator());
339 // loop over tmpTrackRef
341 while ( ( track = static_cast<AliMUONTrack*>(next()) ) ) {
343 AliMUONTrack newTrack;
345 // loop over tmpTrackRef's hits
347 Int_t nTrackHits = track->GetNClusters();
348 while (iHit1 < nTrackHits) {
349 AliMUONTrackParam *trackParam1 = (AliMUONTrackParam*) track->GetTrackParamAtCluster()->UncheckedAt(iHit1);
351 // get track parameters at hit1
352 x1 = trackParam1->GetNonBendingCoor();
353 y1 = trackParam1->GetBendingCoor();
354 z1 = trackParam1->GetZ();
355 pX1 = trackParam1->Px();
356 pY1 = trackParam1->Py();
357 pZ1 = trackParam1->Pz();
359 // prepare new track parameters
367 // loop over next tmpTrackRef's hits
368 Int_t nCombinedHits = 1;
369 for (Int_t iHit2 = iHit1+1; iHit2 < nTrackHits; iHit2++) {
370 AliMUONTrackParam *trackParam2 = (AliMUONTrackParam*) track->GetTrackParamAtCluster()->UncheckedAt(iHit2);
372 // get z position of hit2
373 z2 = trackParam2->GetZ();
375 // complete new track parameters if hit2 is on the same detection element
376 if ( TMath::Abs(z2-z1) < maxGasGap ) {
377 x += trackParam2->GetNonBendingCoor();
378 y += trackParam2->GetBendingCoor();
380 pX += trackParam2->Px();
381 pY += trackParam2->Py();
382 pZ += trackParam2->Pz();
389 // finalize new track parameters
390 x /= (Double_t)nCombinedHits;
391 y /= (Double_t)nCombinedHits;
392 z /= (Double_t)nCombinedHits;
393 pX /= (Double_t)nCombinedHits;
394 pY /= (Double_t)nCombinedHits;
395 pZ /= (Double_t)nCombinedHits;
398 inverseBendingMomentum = 0;
399 if (TMath::Abs(pZ) > 0) {
400 bendingSlope = pY/pZ;
401 nonBendingSlope = pX/pZ;
403 Double_t pYZ = TMath::Sqrt(pY*pY+pZ*pZ);
404 if (pYZ >0) inverseBendingMomentum = 1/pYZ;
405 inverseBendingMomentum *= trackParam1->GetCharge();
407 // set hit parameters
408 hit->SetUniqueID(AliMUONVCluster::BuildUniqueID(trackParam1->GetClusterPtr()->GetChamberId(), 0, 0));
410 hit->SetErrXY(0.,0.);
412 // set new track parameters at new hit
413 AliMUONTrackParam trackParam;
414 trackParam.SetNonBendingCoor(x);
415 trackParam.SetBendingCoor(y);
417 trackParam.SetBendingSlope(bendingSlope);
418 trackParam.SetNonBendingSlope(nonBendingSlope);
419 trackParam.SetInverseBendingMomentum(inverseBendingMomentum);
421 // add track parameters at current hit to the track
422 newTrack.AddTrackParamAtCluster(trackParam, *hit, kTRUE);
427 newTrack.SetTrackID(track->GetTrackID());
428 newTrack.SetTrackParamAtVertex(track->GetTrackParamAtVertex());
429 fTrackRefStore->Add(newTrack);
437 //_____________________________________________________________________________
438 void AliMUONRecoCheck::MakeReconstructibleTracks()
440 /// Isolate the reconstructible tracks
441 if (!(fRecoTrackRefStore = AliMUONESDInterface::NewTrackStore())) return;
443 // create iterator on trackRef
444 TIter next(fTrackRefStore->CreateIterator());
446 // loop over trackRef
448 while ( ( track = static_cast<AliMUONTrack*>(next()) ) ) {
450 Bool_t* chamberInTrack = new Bool_t(AliMUONConstants::NTrackingCh());
451 for (Int_t iCh = 0; iCh < AliMUONConstants::NTrackingCh(); iCh++) chamberInTrack[iCh] = kFALSE;
453 // loop over trackRef's hits to get hit chambers
454 Int_t nTrackHits = track->GetNClusters();
455 for (Int_t iHit = 0; iHit < nTrackHits; iHit++) {
456 AliMUONVCluster* hit = ((AliMUONTrackParam*) track->GetTrackParamAtCluster()->UncheckedAt(iHit))->GetClusterPtr();
457 chamberInTrack[hit->GetChamberId()] = kTRUE;
460 // track is reconstructible if the particle is depositing a hit
461 // in the following chamber combinations:
462 Bool_t trackOK = kTRUE;
463 if (!chamberInTrack[0] && !chamberInTrack[1]) trackOK = kFALSE;
464 if (!chamberInTrack[2] && !chamberInTrack[3]) trackOK = kFALSE;
465 if (!chamberInTrack[4] && !chamberInTrack[5]) trackOK = kFALSE;
466 Int_t nHitsInLastStations = 0;
467 for (Int_t iCh = 6; iCh < AliMUONConstants::NTrackingCh(); iCh++)
468 if (chamberInTrack[iCh]) nHitsInLastStations++;
469 if(nHitsInLastStations < 3) trackOK = kFALSE;
471 // Add reconstructible tracks to fRecoTrackRefStore
472 if (trackOK) fRecoTrackRefStore->Add(*track);
474 delete [] chamberInTrack;