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 // Class AliEMCALTracker
17 // -----------------------
18 // Implementation of the track matching method between barrel tracks and
20 // Besides algorithm implementation, some cuts are required to be set
21 // in order to define, for each track, an acceptance window where clusters
22 // are searched to find best match (if any).
23 // The class accepts as input an ESD container, and works directly on it,
24 // simply setting, for each of its tracks, the fEMCALindex flag, for each
25 // track which is matched to a cluster.
26 // In order to use method, one must launch PropagateBack().
28 // ------------------------------------------------------------------------
29 // author: A. Pulvirenti (alberto.pulvirenti@ct.infn.it)
30 // Revised by Rongrong 2010-05-31 (rongrong.ma@cern.ch)
31 //=========================================================================
33 #include <Riostream.h>
41 #include <TClonesArray.h>
42 #include <TGeoMatrix.h>
45 #include "AliESDEvent.h"
46 #include "AliESDtrack.h"
47 #include "AliESDCaloCluster.h"
48 #include "AliEMCALRecPoint.h"
49 #include "AliRunLoader.h"
50 #include "AliEMCALTrack.h"
51 #include "AliEMCALLoader.h"
52 #include "AliEMCALGeometry.h"
53 #include "AliEMCALReconstructor.h"
54 #include "AliEMCALRecParam.h"
55 #include "AliCDBEntry.h"
56 #include "AliCDBManager.h"
57 #include "AliEMCALReconstructor.h"
59 #include "AliEMCALTracker.h"
61 ClassImp(AliEMCALTracker)
64 //------------------------------------------------------------------------------
66 AliEMCALTracker::AliEMCALTracker()
72 fTrackCorrMode(kTrackCorrMMB),
81 // Default constructor.
82 // Initializes all simple data members to default values,
83 // and all collections to NULL.
84 // Output file name is set to a default value.
89 //------------------------------------------------------------------------------
91 AliEMCALTracker::AliEMCALTracker(const AliEMCALTracker& copy)
94 fCutNITS(copy.fCutNITS),
95 fCutNTPC(copy.fCutNTPC),
97 fTrackCorrMode(copy.fTrackCorrMode),
98 fClusterWindow(copy.fClusterWindow),
99 fCutEta(copy.fCutEta),
100 fCutPhi(copy.fCutPhi),
101 fTracks((TObjArray*)copy.fTracks->Clone()),
102 fClusters((TObjArray*)copy.fClusters->Clone()),
107 // Besides copying all parameters, duplicates all collections.
111 //------------------------------------------------------------------------------
113 AliEMCALTracker& AliEMCALTracker::operator=(const AliEMCALTracker& copy)
116 // Assignment operator.
117 // Besides copying all parameters, duplicates all collections.
120 fCutPt = copy.fCutPt;
121 fClusterWindow = copy.fClusterWindow;
122 fCutEta = copy.fCutEta;
123 fCutPhi = copy.fCutPhi;
125 fTrackCorrMode = copy.fTrackCorrMode;
127 fCutNITS = copy.fCutNITS;
128 fCutNTPC = copy.fCutNTPC;
130 fTracks = (TObjArray*)copy.fTracks->Clone();
131 fClusters = (TObjArray*)copy.fClusters->Clone();
137 //------------------------------------------------------------------------------
139 void AliEMCALTracker::InitParameters()
142 // Retrieve initialization parameters
145 // Check if the instance of AliEMCALRecParam exists,
146 const AliEMCALRecParam* recParam = AliEMCALReconstructor::GetRecParam();
149 AliFatal("Reconstruction parameters for EMCAL not set!");
153 fCutEta = recParam->GetMthCutEta();
154 fCutPhi = recParam->GetMthCutPhi();
155 fStep = recParam->GetExtrapolateStep();
156 fCutPt = recParam->GetTrkCutPt();
157 fCutNITS = recParam->GetTrkCutNITS();
158 fCutNTPC = recParam->GetTrkCutNTPC();
164 //------------------------------------------------------------------------------
166 void AliEMCALTracker::Clear(Option_t* option)
170 // Deletes all objects in arrays and the arrays themselves
174 Bool_t clearTracks = opt.Contains("TRACKS");
175 Bool_t clearClusters = opt.Contains("CLUSTERS");
176 if (opt.Contains("ALL")) {
178 clearClusters = kTRUE;
181 //fTracks is a collection of esdTrack
182 //When clearing this array, the linked objects should not be deleted
183 if (fTracks != 0x0 && clearTracks) {
188 if (fClusters != 0x0 && clearClusters) {
195 //------------------------------------------------------------------------------
197 Int_t AliEMCALTracker::LoadClusters(TTree *cTree)
200 // Load EMCAL clusters in the form of AliEMCALRecPoint,
201 // from simulation temporary files.
202 // (When included in reconstruction chain, this method is used automatically)
207 cTree->SetBranchStatus("*",0); //disable all branches
208 cTree->SetBranchStatus("EMCALECARP",1); //Enable only the branch we need
210 TBranch *branch = cTree->GetBranch("EMCALECARP");
212 AliError("Can't get the branch with the EMCAL clusters");
216 TClonesArray *clusters = new TClonesArray("AliEMCALRecPoint", 1000);
217 branch->SetAddress(&clusters);
219 //cTree->GetEvent(0);
221 Int_t nClusters = (Int_t)clusters->GetEntries();
222 if(fClusters) fClusters->Delete();
223 else fClusters = new TObjArray(0);
224 for (Int_t i = 0; i < nClusters; i++) {
225 AliEMCALRecPoint *cluster = (AliEMCALRecPoint*)clusters->At(i);
226 if (!cluster) continue;
227 AliEMCALMatchCluster *matchCluster = new AliEMCALMatchCluster(i, cluster);
228 fClusters->AddLast(matchCluster);
231 branch->SetAddress(0);
235 AliInfo(Form("Collected %d RecPoints from Tree", fClusters->GetEntries()));
240 //------------------------------------------------------------------------------
242 Int_t AliEMCALTracker::LoadClusters(AliESDEvent *esd)
245 // Load EMCAL clusters in the form of AliESDCaloClusters,
246 // from an AliESD object.
249 // make sure that tracks/clusters collections are empty
251 fClusters = new TObjArray(0);
253 Int_t nClusters = esd->GetNumberOfCaloClusters();
254 for (Int_t i=0; i<nClusters; i++)
256 AliESDCaloCluster *cluster = esd->GetCaloCluster(i);
257 if (!cluster || !cluster->IsEMCAL()) continue ;
258 AliEMCALMatchCluster *matchCluster = new AliEMCALMatchCluster(i, cluster);
259 fClusters->AddLast(matchCluster);
262 AliInfo(Form("Collected %d clusters from ESD", fClusters->GetEntries()));
266 //------------------------------------------------------------------------------
268 Int_t AliEMCALTracker::LoadTracks(AliESDEvent *esd)
275 fTracks = new TObjArray(0);
277 Int_t nTracks = esd->GetNumberOfTracks();
278 //Bool_t isKink=kFALSE;
279 for (Int_t i = 0; i < nTracks; i++)
281 AliESDtrack *esdTrack = esd->GetTrack(i);
282 // set by default the value corresponding to "no match"
283 esdTrack->SetEMCALcluster(kUnmatched);
284 esdTrack->ResetStatus(AliESDtrack::kEMCALmatch);
286 //Select good quaulity tracks
287 if(esdTrack->Pt()<fCutPt) continue;
288 if(esdTrack->GetNcls(1)<fCutNTPC)continue;
290 //Loose geometric cut
291 Double_t phi = esdTrack->Phi()*TMath::RadToDeg();
292 if(TMath::Abs(esdTrack->Eta())>0.8 || phi <= 20 || phi >= 240 ) continue;
294 fTracks->AddLast(esdTrack);
297 AliInfo(Form("Collected %d tracks", fTracks->GetEntries()));
301 //------------------------------------------------------------------------------
303 void AliEMCALTracker::SetTrackCorrectionMode(Option_t *option)
306 // Set track correction mode
307 // gest the choice in string format and converts into
314 if (!opt.CompareTo("NONE"))
316 fTrackCorrMode = kTrackCorrNone;
318 else if (!opt.CompareTo("MMB"))
320 fTrackCorrMode = kTrackCorrMMB;
324 cerr << "E-AliEMCALTracker::SetTrackCorrectionMode '" << option << "': Unrecognized option" << endl;
328 //------------------------------------------------------------------------------
330 Int_t AliEMCALTracker::PropagateBack(AliESDEvent* esd)
333 // Main operation method.
334 // Gets external AliESD containing tracks to be matched.
335 // After executing match finding, stores in the same ESD object all infos
336 // and releases the object for further reconstruction steps.
339 // Note: should always return 0=OK, because otherwise all tracking
340 // is aborted for this event
343 AliError("NULL ESD passed");
347 // step 1: collect clusters
348 Int_t okLoadClusters, nClusters;
349 if (!fClusters || (fClusters && fClusters->IsEmpty())) {
350 okLoadClusters = LoadClusters(esd);
352 nClusters = fClusters->GetEntries();
354 // step 2: collect ESD tracks
355 Int_t nTracks, okLoadTracks;
356 okLoadTracks = LoadTracks(esd);
357 nTracks = fTracks->GetEntries();
359 // step 3: for each track, find the closest cluster as matched within residual cuts
361 for (Int_t it = 0; it < nTracks; it++)
363 AliESDtrack *track = (AliESDtrack*)fTracks->At(it);
364 index = FindMatchedCluster(track);
367 AliEMCALMatchCluster *cluster = (AliEMCALMatchCluster*)fClusters->At(index);
368 track->SetEMCALcluster(cluster->Index());
369 track->SetStatus(AliESDtrack::kEMCALmatch);
377 //------------------------------------------------------------------------------
379 Int_t AliEMCALTracker::FindMatchedCluster(AliESDtrack *track)
382 // For each track, extrapolate it to all the clusters
383 // Find the closest one as matched if the residuals (dEta, dPhi) satisfy the cuts
386 Double_t maxEta=fCutEta;
387 Double_t maxPhi=fCutPhi;
390 // If the esdFriend is available, use the TPCOuter point as the starting point of extrapolation
391 // Otherwise use the TPCInner point
392 AliExternalTrackParam *trkParam = 0;
393 const AliESDfriendTrack* friendTrack = track->GetFriendTrack();
394 if(friendTrack && friendTrack->GetTPCOut())
395 trkParam = const_cast<AliExternalTrackParam*>(friendTrack->GetTPCOut());
397 trkParam = const_cast<AliExternalTrackParam*>(track->GetInnerParam());
398 if(!trkParam) return index;
401 AliExternalTrackParam trkParamTmp(*trkParam);
403 if(!ExtrapolateTrackToEMCalSurface(&trkParamTmp, 430., track->GetMass(), fStep, eta, phi)) return index;
404 if(TMath::Abs(eta)>0.75 || (phi) < 70*TMath::DegToRad() || (phi) > 190*TMath::DegToRad()) return index;
406 //Perform extrapolation
408 trkParamTmp.GetXYZ(trkPos);
409 Int_t nclusters = fClusters->GetEntries();
410 for(Int_t ic=0; ic<nclusters; ic++)
412 AliEMCALMatchCluster *cluster = (AliEMCALMatchCluster*)fClusters->At(ic);
413 Float_t clsPos[3] = {cluster->X(),cluster->Y(),cluster->Z()};
414 Double_t dR = TMath::Sqrt(TMath::Power(trkPos[0]-clsPos[0],2)+TMath::Power(trkPos[1]-clsPos[1],2)+TMath::Power(trkPos[2]-clsPos[2],2));
415 if(dR > fClusterWindow) continue;
417 AliExternalTrackParam trkParTmp(trkParamTmp);
419 Double_t tmpEta, tmpPhi;
420 if(!ExtrapolateTrackToPosition(&trkParTmp, clsPos,track->GetMass(), fStep, tmpEta, tmpPhi)) continue;
421 if(TMath::Abs(tmpPhi)<TMath::Abs(maxPhi) && TMath::Abs(tmpEta)<TMath::Abs(maxEta))
433 //------------------------------------------------------------------------------
435 Bool_t AliEMCALTracker::ExtrapolateTrackToEMCalSurface(AliExternalTrackParam *trkParam, Double_t emcalR, Double_t mass, Double_t step, Double_t &eta, Double_t &phi)
437 eta = -999, phi = -999;
438 if(!trkParam) return kFALSE;
439 if(!AliTrackerBase::PropagateTrackToBxByBz(trkParam, emcalR, mass, step, kTRUE, 0.8, -1)) return kFALSE;
440 Double_t trkPos[3] = {0.,0.,0.};
441 if(!trkParam->GetXYZ(trkPos)) return kFALSE;
442 TVector3 trkPosVec(trkPos[0],trkPos[1],trkPos[2]);
443 eta = trkPosVec.Eta();
444 phi = trkPosVec.Phi();
446 phi += 2*TMath::Pi();
453 //------------------------------------------------------------------------------
455 Bool_t AliEMCALTracker::ExtrapolateTrackToPosition(AliExternalTrackParam *trkParam, Float_t *clsPos, Double_t mass, Double_t step, Double_t &tmpEta, Double_t &tmpPhi)
458 //Return the residual by extrapolating a track param to a global position
462 if(!trkParam) return kFALSE;
463 Double_t trkPos[3] = {0.,0.,0.};
464 TVector3 vec(clsPos[0],clsPos[1],clsPos[2]);
465 Double_t alpha = ((int)(vec.Phi()*TMath::RadToDeg()/20)+0.5)*20*TMath::DegToRad();
466 vec.RotateZ(-alpha); //Rotate the cluster to the local extrapolation coordinate system
467 if(!AliTrackerBase::PropagateTrackToBxByBz(trkParam, vec.X(), mass, step,kTRUE, 0.8, -1)) return kFALSE;
468 if(!trkParam->GetXYZ(trkPos)) return kFALSE; //Get the extrapolated global position
470 TVector3 clsPosVec(clsPos[0],clsPos[1],clsPos[2]);
471 TVector3 trkPosVec(trkPos[0],trkPos[1],trkPos[2]);
473 // track cluster matching
474 tmpPhi = clsPosVec.DeltaPhi(trkPosVec); // tmpPhi is between -pi and pi
475 tmpEta = clsPosVec.Eta()-trkPosVec.Eta();
482 //------------------------------------------------------------------------------
484 Bool_t AliEMCALTracker::ExtrapolateTrackToCluster(AliExternalTrackParam *trkParam, AliVCluster *cluster, Double_t mass, Double_t step, Double_t &tmpEta, Double_t &tmpPhi)
487 //Return the residual by extrapolating a track param to a cluster
491 if(!cluster) return kFALSE;
493 Float_t clsPos[3] = {0.,0.,0.};
494 cluster->GetPosition(clsPos);
496 return ExtrapolateTrackToPosition(trkParam, clsPos, mass, step, tmpEta, tmpPhi);
501 //------------------------------------------------------------------------------
503 void AliEMCALTracker::UnloadClusters()
506 // Free memory from all arrays
507 // This method is called after the local tracking step
508 // so we can safely delete everything
515 //------------------------------------------------------------------------------
517 AliEMCALTracker::AliEMCALMatchCluster::AliEMCALMatchCluster(Int_t index, AliEMCALRecPoint *recPoint)
524 // Translates an AliEMCALRecPoint object into the internal format.
525 // Index of passed cluster in its native array must be specified.
528 recPoint->GetGlobalPosition(clpos);
535 //------------------------------------------------------------------------------
537 AliEMCALTracker::AliEMCALMatchCluster::AliEMCALMatchCluster(Int_t index, AliESDCaloCluster *caloCluster)
544 // Translates an AliESDCaloCluster object into the internal format.
545 // Index of passed cluster in its native array must be specified.
547 Float_t clpos[3]= {0., 0., 0.};
548 caloCluster->GetPosition(clpos);
550 fX = (Double_t)clpos[0];
551 fY = (Double_t)clpos[1];
552 fZ = (Double_t)clpos[2];