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 //-----------------------------------------------------------------------------
26 #include "AliMUONRecoCheck.h"
27 #include "AliMUONRawClusterV2.h"
28 #include "AliMUONTrack.h"
29 #include "AliMUONConstants.h"
30 #include "AliMUONDataInterface.h"
31 #include "AliMUONTrackStoreV1.h"
33 #include "AliMCEventHandler.h"
34 #include "AliMCEvent.h"
36 #include "AliTrackReference.h"
39 #include <TParticle.h>
40 #include <TParticlePDG.h>
42 #include <Riostream.h>
45 ClassImp(AliMUONRecoCheck)
48 //_____________________________________________________________________________
49 AliMUONRecoCheck::AliMUONRecoCheck(Char_t *chLoader, Char_t *pathSim)
51 fMCEventHandler(new AliMCEventHandler()),
52 fDataInterface(new AliMUONDataInterface(chLoader)),
55 fRecoTrackRefStore(0x0),
59 fMCEventHandler->SetInputPath(pathSim);
60 fMCEventHandler->InitIO("");
63 //_____________________________________________________________________________
64 AliMUONRecoCheck::~AliMUONRecoCheck()
67 delete fMCEventHandler;
68 delete fDataInterface;
72 //_____________________________________________________________________________
73 void AliMUONRecoCheck::ResetStores()
75 /// Deletes all the store objects that have been created and resets the pointers to 0x0
76 delete fTrackRefStore; fTrackRefStore = 0x0;
77 delete fRecoTrackRefStore; fRecoTrackRefStore = 0x0;
78 delete fRecoTrackStore; fRecoTrackStore = 0x0;
81 //_____________________________________________________________________________
82 Int_t AliMUONRecoCheck::NumberOfEvents() const
84 /// Return the number of events
85 if (fDataInterface->IsValid()) return fDataInterface->NumberOfEvents();
89 //_____________________________________________________________________________
90 AliMUONVTrackStore* AliMUONRecoCheck::ReconstructedTracks(Int_t event)
92 /// Return the reconstructed track store for a given event
93 if (!fDataInterface->IsValid()) return new AliMUONTrackStoreV1();
95 if (event != fCurrentEvent) {
97 fCurrentEvent = event;
100 if (fRecoTrackStore != 0x0) return fRecoTrackStore;
102 fRecoTrackStore = new AliMUONTrackStoreV1();
104 return fRecoTrackStore;
107 //_____________________________________________________________________________
108 AliMUONVTrackStore* AliMUONRecoCheck::TrackRefs(Int_t event)
110 /// Return a track store containing the track references (converted into
111 /// MUONTrack objects) for a given event
112 if (event != fCurrentEvent) {
114 fCurrentEvent = event;
117 if (fTrackRefStore != 0x0) return fTrackRefStore;
119 if (!fMCEventHandler->GetEvent(event)) return 0x0;
121 return fTrackRefStore;
125 //_____________________________________________________________________________
126 AliMUONVTrackStore* AliMUONRecoCheck::ReconstructibleTracks(Int_t event)
128 /// Return a track store containing the reconstructible tracks for a given event
129 if (event != fCurrentEvent) {
131 fCurrentEvent = event;
134 if (fRecoTrackRefStore != 0x0) return fRecoTrackRefStore;
136 if (TrackRefs(event) == 0x0) return 0x0;
137 MakeReconstructibleTracks();
138 return fRecoTrackRefStore;
142 //_____________________________________________________________________________
143 void AliMUONRecoCheck::MakeTrackRefs()
145 /// Make reconstructible tracks
146 AliMUONVTrackStore *tmpTrackRefStore = new AliMUONTrackStoreV1();
148 Double_t x, y, z, pX, pY, pZ, bendingSlope, nonBendingSlope, inverseBendingMomentum;
150 TClonesArray* trackRefs;
151 Int_t nTrackRef = fMCEventHandler->MCEvent()->GetNumberOfTracks();
153 // loop over simulated tracks
154 for (Int_t iTrackRef = 0; iTrackRef < nTrackRef; ++iTrackRef) {
155 Int_t nHits = fMCEventHandler->GetParticleAndTR(iTrackRef, particle, trackRefs);
157 // skip empty trackRefs
158 if (nHits < 1) continue;
160 // skip trackRefs not in MUON
161 AliTrackReference* trackReference0 = static_cast<AliTrackReference*>(trackRefs->UncheckedAt(0));
162 if (trackReference0->DetectorId() != AliTrackReference::kMUON) continue;
166 // get track parameters at particle's vertex
174 // compute rest of track parameters at particle's vertex
177 inverseBendingMomentum = 0;
178 if (TMath::Abs(pZ) > 0) {
179 bendingSlope = pY/pZ;
180 nonBendingSlope = pX/pZ;
182 Double_t pYZ = TMath::Sqrt(pY*pY+pZ*pZ);
183 if (pYZ >0) inverseBendingMomentum = 1/pYZ;
184 TParticlePDG* ppdg = particle->GetPDG(1);
185 Int_t charge = (Int_t)(ppdg->Charge()/3.0);
186 inverseBendingMomentum *= charge;
188 // set track parameters at particle's vertex
189 AliMUONTrackParam trackParamAtVertex;
190 trackParamAtVertex.SetNonBendingCoor(x);
191 trackParamAtVertex.SetBendingCoor(y);
192 trackParamAtVertex.SetZ(z);
193 trackParamAtVertex.SetBendingSlope(bendingSlope);
194 trackParamAtVertex.SetNonBendingSlope(nonBendingSlope);
195 trackParamAtVertex.SetInverseBendingMomentum(inverseBendingMomentum);
197 // add track parameters at vertex
198 track.SetTrackParamAtVertex(&trackParamAtVertex);
200 // loop over simulated track hits
201 for (Int_t iHit = 0; iHit < nHits; ++iHit) {
202 AliTrackReference* trackReference = static_cast<AliTrackReference*>(trackRefs->UncheckedAt(iHit));
204 // Get track parameters of current hit
205 x = trackReference->X();
206 y = trackReference->Y();
207 z = trackReference->Z();
208 pX = trackReference->Px();
209 pY = trackReference->Py();
210 pZ = trackReference->Pz();
212 // check chamberId of current trackReference
213 Int_t chamberId = AliMUONConstants::ChamberNumber(z);
214 if (chamberId < 0 || chamberId >= AliMUONConstants::NTrackingCh()) continue;
216 // set hit parameters
217 AliMUONRawClusterV2 hit(chamberId, 0, 0);
221 // compute track parameters at hit
222 Double_t bendingSlope = 0;
223 Double_t nonBendingSlope = 0;
224 Double_t inverseBendingMomentum = 0;
225 if (TMath::Abs(pZ) > 0) {
226 bendingSlope = pY/pZ;
227 nonBendingSlope = pX/pZ;
229 Double_t pYZ = TMath::Sqrt(pY*pY+pZ*pZ);
230 if (pYZ >0) inverseBendingMomentum = 1/pYZ;
231 inverseBendingMomentum *= charge;
233 // set track parameters at hit
234 AliMUONTrackParam trackParam;
235 trackParam.SetNonBendingCoor(x);
236 trackParam.SetBendingCoor(y);
238 trackParam.SetBendingSlope(bendingSlope);
239 trackParam.SetNonBendingSlope(nonBendingSlope);
240 trackParam.SetInverseBendingMomentum(inverseBendingMomentum);
242 // add track parameters at current hit to the track
243 track.AddTrackParamAtCluster(trackParam,hit,kTRUE);
246 track.GetTrackParamAtCluster()->Sort();
247 track.SetTrackID(iTrackRef);
248 tmpTrackRefStore->Add(track);
251 CleanMuonTrackRef(tmpTrackRefStore);
253 delete tmpTrackRefStore;
256 //_____________________________________________________________________________
257 void AliMUONRecoCheck::CleanMuonTrackRef(const AliMUONVTrackStore *tmpTrackRefStore)
259 /// Re-calculate hits parameters because two AliTrackReferences are recorded for
260 /// each chamber (one when particle is entering + one when particle is leaving
261 /// the sensitive volume)
262 fTrackRefStore = new AliMUONTrackStoreV1();
264 Double_t maxGasGap = 1.; // cm
265 Double_t x, y, z, pX, pY, pZ, x1, y1, z1, pX1, pY1, pZ1, z2;
266 Double_t bendingSlope,nonBendingSlope,inverseBendingMomentum;
269 TIter next(tmpTrackRefStore->CreateIterator());
271 // loop over tmpTrackRef
273 while ( ( track = static_cast<AliMUONTrack*>(next()) ) ) {
275 AliMUONTrack newTrack;
277 // loop over tmpTrackRef's hits
279 Int_t nTrackHits = track->GetNClusters();
280 while (iHit1 < nTrackHits) {
281 AliMUONTrackParam *trackParam1 = (AliMUONTrackParam*) track->GetTrackParamAtCluster()->UncheckedAt(iHit1);
283 // get track parameters at hit1
284 x1 = trackParam1->GetNonBendingCoor();
285 y1 = trackParam1->GetBendingCoor();
286 z1 = trackParam1->GetZ();
287 pX1 = trackParam1->Px();
288 pY1 = trackParam1->Py();
289 pZ1 = trackParam1->Pz();
291 // prepare new track parameters
299 // loop over next tmpTrackRef's hits
300 Int_t nCombinedHits = 1;
301 for (Int_t iHit2 = iHit1+1; iHit2 < nTrackHits; iHit2++) {
302 AliMUONTrackParam *trackParam2 = (AliMUONTrackParam*) track->GetTrackParamAtCluster()->UncheckedAt(iHit2);
304 // get z position of hit2
305 z2 = trackParam2->GetZ();
307 // complete new track parameters if hit2 is on the same detection element
308 if ( TMath::Abs(z2-z1) < maxGasGap ) {
309 x += trackParam2->GetNonBendingCoor();
310 y += trackParam2->GetBendingCoor();
312 pX += trackParam2->Px();
313 pY += trackParam2->Py();
314 pZ += trackParam2->Pz();
321 // finalize new track parameters
322 x /= (Double_t)nCombinedHits;
323 y /= (Double_t)nCombinedHits;
324 z /= (Double_t)nCombinedHits;
325 pX /= (Double_t)nCombinedHits;
326 pY /= (Double_t)nCombinedHits;
327 pZ /= (Double_t)nCombinedHits;
330 inverseBendingMomentum = 0;
331 if (TMath::Abs(pZ) > 0) {
332 bendingSlope = pY/pZ;
333 nonBendingSlope = pX/pZ;
335 Double_t pYZ = TMath::Sqrt(pY*pY+pZ*pZ);
336 if (pYZ >0) inverseBendingMomentum = 1/pYZ;
337 inverseBendingMomentum *= trackParam1->GetCharge();
339 // set hit parameters
340 AliMUONRawClusterV2 hit(trackParam1->GetClusterPtr()->GetChamberId(), 0, 0);
344 // set new track parameters at new hit
345 AliMUONTrackParam trackParam;
346 trackParam.SetNonBendingCoor(x);
347 trackParam.SetBendingCoor(y);
349 trackParam.SetBendingSlope(bendingSlope);
350 trackParam.SetNonBendingSlope(nonBendingSlope);
351 trackParam.SetInverseBendingMomentum(inverseBendingMomentum);
353 // add track parameters at current hit to the track
354 newTrack.AddTrackParamAtCluster(trackParam,hit,kTRUE);
359 newTrack.GetTrackParamAtCluster()->Sort();
360 newTrack.SetTrackID(track->GetTrackID());
361 newTrack.SetTrackParamAtVertex(track->GetTrackParamAtVertex());
362 fTrackRefStore->Add(newTrack);
368 //_____________________________________________________________________________
369 void AliMUONRecoCheck::MakeReconstructibleTracks()
371 /// Calculate the number of reconstructible tracks
372 fRecoTrackRefStore = new AliMUONTrackStoreV1();
374 // create iterator on trackRef
375 TIter next(fTrackRefStore->CreateIterator());
377 // loop over trackRef
379 while ( ( track = static_cast<AliMUONTrack*>(next()) ) ) {
381 Bool_t* chamberInTrack = new Bool_t(AliMUONConstants::NTrackingCh());
382 for (Int_t iCh = 0; iCh < AliMUONConstants::NTrackingCh(); iCh++) chamberInTrack[iCh] = kFALSE;
384 // loop over trackRef's hits to get hit chambers
385 Int_t nTrackHits = track->GetNClusters();
386 for (Int_t iHit = 0; iHit < nTrackHits; iHit++) {
387 AliMUONVCluster* hit = ((AliMUONTrackParam*) track->GetTrackParamAtCluster()->UncheckedAt(iHit))->GetClusterPtr();
388 chamberInTrack[hit->GetChamberId()] = kTRUE;
391 // track is reconstructible if the particle is depositing a hit
392 // in the following chamber combinations:
393 Bool_t trackOK = kTRUE;
394 if (!chamberInTrack[0] && !chamberInTrack[1]) trackOK = kFALSE;
395 if (!chamberInTrack[2] && !chamberInTrack[3]) trackOK = kFALSE;
396 if (!chamberInTrack[4] && !chamberInTrack[5]) trackOK = kFALSE;
397 Int_t nHitsInLastStations = 0;
398 for (Int_t iCh = 6; iCh < AliMUONConstants::NTrackingCh(); iCh++)
399 if (chamberInTrack[iCh]) nHitsInLastStations++;
400 if(nHitsInLastStations < 3) trackOK = kFALSE;
402 // Add reconstructible tracks to fRecoTrackRefStore
403 if (trackOK) fRecoTrackRefStore->Add(*track);
405 delete [] chamberInTrack;