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 #include "AliMUONRecoCheck.h"
33 #include "AliMUONRawClusterV2.h"
34 #include "AliMUONTrack.h"
35 #include "AliMUONConstants.h"
36 #include "AliMUONTrackStoreV1.h"
38 #include "AliMCEventHandler.h"
39 #include "AliMCEvent.h"
41 #include "AliTrackReference.h"
43 #include "AliESDEvent.h"
44 #include "AliESDMuonTrack.h"
48 #include <TParticle.h>
49 #include <TParticlePDG.h>
50 #include <Riostream.h>
53 ClassImp(AliMUONRecoCheck)
56 //_____________________________________________________________________________
57 AliMUONRecoCheck::AliMUONRecoCheck(Char_t *esdFileName, Char_t *pathSim)
59 fMCEventHandler(new AliMCEventHandler()),
60 fESDEvent(new AliESDEvent()),
65 fRecoTrackRefStore(0x0),
70 // TrackRefs and Particules
71 fMCEventHandler->SetInputPath(pathSim);
72 fMCEventHandler->InitIO("");
75 fESDFile = TFile::Open(esdFileName); // open the file
76 if (!fESDFile || !fESDFile->IsOpen()) {
77 AliError(Form("opening ESD file %s failed", esdFileName));
81 fESDTree = (TTree*) fESDFile->Get("esdTree"); // get the tree
83 AliError("no ESD tree found");
88 fESDEvent->ReadFromTree(fESDTree); // link fESDEvent to the tree
91 //_____________________________________________________________________________
92 AliMUONRecoCheck::~AliMUONRecoCheck()
95 delete fMCEventHandler;
97 if (fESDFile) fESDFile->Close();
101 //_____________________________________________________________________________
102 void AliMUONRecoCheck::ResetStores()
104 /// Deletes all the store objects that have been created and resets the pointers to 0x0
105 delete fTrackRefStore; fTrackRefStore = 0x0;
106 delete fRecoTrackRefStore; fRecoTrackRefStore = 0x0;
107 delete fRecoTrackStore; fRecoTrackStore = 0x0;
110 //_____________________________________________________________________________
111 Int_t AliMUONRecoCheck::NumberOfEvents() const
113 /// Return the number of events
114 if (fESDTree) return fESDTree->GetEntries();
118 //_____________________________________________________________________________
119 AliMUONVTrackStore* AliMUONRecoCheck::ReconstructedTracks(Int_t event)
121 /// Return a track store containing the reconstructed tracks (converted into
122 /// MUONTrack objects) for a given event
123 if (event != fCurrentEvent) {
125 fCurrentEvent = event;
128 if (fRecoTrackStore != 0x0) return fRecoTrackStore;
130 if (!fESDTree) return 0x0;
131 if (fESDTree->GetEvent(event) <= 0) {
132 AliError(Form("fails to read ESD object for event %d", event));
135 MakeReconstructedTracks();
136 return fRecoTrackStore;
140 //_____________________________________________________________________________
141 AliMUONVTrackStore* AliMUONRecoCheck::TrackRefs(Int_t event)
143 /// Return a track store containing the track references (converted into
144 /// MUONTrack objects) for a given event
145 if (event != fCurrentEvent) {
147 fCurrentEvent = event;
150 if (fTrackRefStore != 0x0) return fTrackRefStore;
152 if (!fMCEventHandler->GetEvent(event)) {
153 AliError(Form("fails to read MC objects for event %d", event));
157 return fTrackRefStore;
161 //_____________________________________________________________________________
162 AliMUONVTrackStore* AliMUONRecoCheck::ReconstructibleTracks(Int_t event)
164 /// Return a track store containing the reconstructible tracks for a given event
165 if (event != fCurrentEvent) {
167 fCurrentEvent = event;
170 if (fRecoTrackRefStore != 0x0) return fRecoTrackRefStore;
172 if (TrackRefs(event) == 0x0) return 0x0;
173 MakeReconstructibleTracks();
174 return fRecoTrackRefStore;
178 //_____________________________________________________________________________
179 void AliMUONRecoCheck::MakeReconstructedTracks()
181 /// Make reconstructed tracks
182 fRecoTrackStore = new AliMUONTrackStoreV1();
184 Int_t nTracks = Int_t(fESDEvent->GetNumberOfMuonTracks());
186 // loop over all reconstructed tracks
187 for (Int_t iTrack = 0; iTrack < nTracks; iTrack++) {
188 AliESDMuonTrack* esdTrack = fESDEvent->GetMuonTrack(iTrack);
190 // copy ESD MUON track into standard MUON track
191 AliMUONTrack track(*esdTrack);
193 // add track to the store
194 fRecoTrackStore->Add(track);
199 //_____________________________________________________________________________
200 void AliMUONRecoCheck::MakeTrackRefs()
202 /// Make reconstructible tracks
203 AliMUONVTrackStore *tmpTrackRefStore = new AliMUONTrackStoreV1();
205 Double_t x, y, z, pX, pY, pZ, bendingSlope, nonBendingSlope, inverseBendingMomentum;
207 TClonesArray* trackRefs;
208 Int_t nTrackRef = fMCEventHandler->MCEvent()->GetNumberOfTracks();
210 // loop over simulated tracks
211 for (Int_t iTrackRef = 0; iTrackRef < nTrackRef; ++iTrackRef) {
212 Int_t nHits = fMCEventHandler->GetParticleAndTR(iTrackRef, particle, trackRefs);
214 // skip empty trackRefs
215 if (nHits < 1) continue;
217 // get the particle charge for further calculation
218 TParticlePDG* ppdg = particle->GetPDG();
219 Int_t charge = (Int_t)(ppdg->Charge()/3.0);
223 // loop over simulated track hits
224 for (Int_t iHit = 0; iHit < nHits; ++iHit) {
225 AliTrackReference* trackReference = static_cast<AliTrackReference*>(trackRefs->UncheckedAt(iHit));
227 // skip trackRefs not in MUON
228 if (trackReference->DetectorId() != AliTrackReference::kMUON) continue;
230 // Get track parameters of current hit
231 x = trackReference->X();
232 y = trackReference->Y();
233 z = trackReference->Z();
234 pX = trackReference->Px();
235 pY = trackReference->Py();
236 pZ = trackReference->Pz();
238 // check chamberId of current trackReference
239 Int_t chamberId = AliMUONConstants::ChamberNumber(z);
240 if (chamberId < 0 || chamberId >= AliMUONConstants::NTrackingCh()) continue;
242 // set hit parameters
243 AliMUONRawClusterV2 hit(chamberId, 0, 0);
247 // compute track parameters at hit
248 Double_t bendingSlope = 0;
249 Double_t nonBendingSlope = 0;
250 Double_t inverseBendingMomentum = 0;
251 if (TMath::Abs(pZ) > 0) {
252 bendingSlope = pY/pZ;
253 nonBendingSlope = pX/pZ;
255 Double_t pYZ = TMath::Sqrt(pY*pY+pZ*pZ);
256 if (pYZ >0) inverseBendingMomentum = 1/pYZ;
257 inverseBendingMomentum *= charge;
259 // set track parameters at hit
260 AliMUONTrackParam trackParam;
261 trackParam.SetNonBendingCoor(x);
262 trackParam.SetBendingCoor(y);
264 trackParam.SetBendingSlope(bendingSlope);
265 trackParam.SetNonBendingSlope(nonBendingSlope);
266 trackParam.SetInverseBendingMomentum(inverseBendingMomentum);
268 // add track parameters at current hit to the track
269 track.AddTrackParamAtCluster(trackParam,hit,kTRUE);
272 // if none of the track hits was in MUON, goto the next track
273 if (track.GetNClusters() < 1) continue;
275 // get track parameters at particle's vertex
283 // compute rest of track parameters at particle's vertex
286 inverseBendingMomentum = 0;
287 if (TMath::Abs(pZ) > 0) {
288 bendingSlope = pY/pZ;
289 nonBendingSlope = pX/pZ;
291 Double_t pYZ = TMath::Sqrt(pY*pY+pZ*pZ);
292 if (pYZ >0) inverseBendingMomentum = 1/pYZ;
293 inverseBendingMomentum *= charge;
295 // set track parameters at particle's vertex
296 AliMUONTrackParam trackParamAtVertex;
297 trackParamAtVertex.SetNonBendingCoor(x);
298 trackParamAtVertex.SetBendingCoor(y);
299 trackParamAtVertex.SetZ(z);
300 trackParamAtVertex.SetBendingSlope(bendingSlope);
301 trackParamAtVertex.SetNonBendingSlope(nonBendingSlope);
302 trackParamAtVertex.SetInverseBendingMomentum(inverseBendingMomentum);
304 // add track parameters at vertex
305 track.SetTrackParamAtVertex(&trackParamAtVertex);
307 // sort trackParamAtCluster and store the track
308 track.GetTrackParamAtCluster()->Sort();
309 track.SetTrackID(iTrackRef);
310 tmpTrackRefStore->Add(track);
313 CleanMuonTrackRef(tmpTrackRefStore);
315 delete tmpTrackRefStore;
318 //_____________________________________________________________________________
319 void AliMUONRecoCheck::CleanMuonTrackRef(const AliMUONVTrackStore *tmpTrackRefStore)
321 /// Re-calculate hits parameters because two AliTrackReferences are recorded for
322 /// each chamber (one when particle is entering + one when particle is leaving
323 /// the sensitive volume)
324 fTrackRefStore = new AliMUONTrackStoreV1();
326 Double_t maxGasGap = 1.; // cm
327 Double_t x, y, z, pX, pY, pZ, x1, y1, z1, pX1, pY1, pZ1, z2;
328 Double_t bendingSlope,nonBendingSlope,inverseBendingMomentum;
331 TIter next(tmpTrackRefStore->CreateIterator());
333 // loop over tmpTrackRef
335 while ( ( track = static_cast<AliMUONTrack*>(next()) ) ) {
337 AliMUONTrack newTrack;
339 // loop over tmpTrackRef's hits
341 Int_t nTrackHits = track->GetNClusters();
342 while (iHit1 < nTrackHits) {
343 AliMUONTrackParam *trackParam1 = (AliMUONTrackParam*) track->GetTrackParamAtCluster()->UncheckedAt(iHit1);
345 // get track parameters at hit1
346 x1 = trackParam1->GetNonBendingCoor();
347 y1 = trackParam1->GetBendingCoor();
348 z1 = trackParam1->GetZ();
349 pX1 = trackParam1->Px();
350 pY1 = trackParam1->Py();
351 pZ1 = trackParam1->Pz();
353 // prepare new track parameters
361 // loop over next tmpTrackRef's hits
362 Int_t nCombinedHits = 1;
363 for (Int_t iHit2 = iHit1+1; iHit2 < nTrackHits; iHit2++) {
364 AliMUONTrackParam *trackParam2 = (AliMUONTrackParam*) track->GetTrackParamAtCluster()->UncheckedAt(iHit2);
366 // get z position of hit2
367 z2 = trackParam2->GetZ();
369 // complete new track parameters if hit2 is on the same detection element
370 if ( TMath::Abs(z2-z1) < maxGasGap ) {
371 x += trackParam2->GetNonBendingCoor();
372 y += trackParam2->GetBendingCoor();
374 pX += trackParam2->Px();
375 pY += trackParam2->Py();
376 pZ += trackParam2->Pz();
383 // finalize new track parameters
384 x /= (Double_t)nCombinedHits;
385 y /= (Double_t)nCombinedHits;
386 z /= (Double_t)nCombinedHits;
387 pX /= (Double_t)nCombinedHits;
388 pY /= (Double_t)nCombinedHits;
389 pZ /= (Double_t)nCombinedHits;
392 inverseBendingMomentum = 0;
393 if (TMath::Abs(pZ) > 0) {
394 bendingSlope = pY/pZ;
395 nonBendingSlope = pX/pZ;
397 Double_t pYZ = TMath::Sqrt(pY*pY+pZ*pZ);
398 if (pYZ >0) inverseBendingMomentum = 1/pYZ;
399 inverseBendingMomentum *= trackParam1->GetCharge();
401 // set hit parameters
402 AliMUONRawClusterV2 hit(trackParam1->GetClusterPtr()->GetChamberId(), 0, 0);
406 // set new track parameters at new hit
407 AliMUONTrackParam trackParam;
408 trackParam.SetNonBendingCoor(x);
409 trackParam.SetBendingCoor(y);
411 trackParam.SetBendingSlope(bendingSlope);
412 trackParam.SetNonBendingSlope(nonBendingSlope);
413 trackParam.SetInverseBendingMomentum(inverseBendingMomentum);
415 // add track parameters at current hit to the track
416 newTrack.AddTrackParamAtCluster(trackParam,hit,kTRUE);
421 newTrack.GetTrackParamAtCluster()->Sort();
422 newTrack.SetTrackID(track->GetTrackID());
423 newTrack.SetTrackParamAtVertex(track->GetTrackParamAtVertex());
424 fTrackRefStore->Add(newTrack);
430 //_____________________________________________________________________________
431 void AliMUONRecoCheck::MakeReconstructibleTracks()
433 /// Isolate the reconstructible tracks
434 fRecoTrackRefStore = new AliMUONTrackStoreV1();
436 // create iterator on trackRef
437 TIter next(fTrackRefStore->CreateIterator());
439 // loop over trackRef
441 while ( ( track = static_cast<AliMUONTrack*>(next()) ) ) {
443 Bool_t* chamberInTrack = new Bool_t(AliMUONConstants::NTrackingCh());
444 for (Int_t iCh = 0; iCh < AliMUONConstants::NTrackingCh(); iCh++) chamberInTrack[iCh] = kFALSE;
446 // loop over trackRef's hits to get hit chambers
447 Int_t nTrackHits = track->GetNClusters();
448 for (Int_t iHit = 0; iHit < nTrackHits; iHit++) {
449 AliMUONVCluster* hit = ((AliMUONTrackParam*) track->GetTrackParamAtCluster()->UncheckedAt(iHit))->GetClusterPtr();
450 chamberInTrack[hit->GetChamberId()] = kTRUE;
453 // track is reconstructible if the particle is depositing a hit
454 // in the following chamber combinations:
455 Bool_t trackOK = kTRUE;
456 if (!chamberInTrack[0] && !chamberInTrack[1]) trackOK = kFALSE;
457 if (!chamberInTrack[2] && !chamberInTrack[3]) trackOK = kFALSE;
458 if (!chamberInTrack[4] && !chamberInTrack[5]) trackOK = kFALSE;
459 Int_t nHitsInLastStations = 0;
460 for (Int_t iCh = 6; iCh < AliMUONConstants::NTrackingCh(); iCh++)
461 if (chamberInTrack[iCh]) nHitsInLastStations++;
462 if(nHitsInLastStations < 3) trackOK = kFALSE;
464 // Add reconstructible tracks to fRecoTrackRefStore
465 if (trackOK) fRecoTrackRefStore->Add(*track);
467 delete [] chamberInTrack;