3 // Emcal jet finder task.
5 // Authors: C.Loizides, S.Aiola
8 #include "AliEmcalJetTask.h"
11 #include <TClonesArray.h>
13 #include <TLorentzVector.h>
15 #include "AliAnalysisManager.h"
16 #include "AliCentrality.h"
17 #include "AliEMCALGeometry.h"
18 #include "AliESDEvent.h"
19 #include "AliEmcalJet.h"
20 #include "AliEmcalParticle.h"
21 #include "AliFJWrapper.h"
22 #include "AliMCEvent.h"
23 #include "AliVCluster.h"
24 #include "AliVEvent.h"
25 #include "AliVParticle.h"
27 ClassImp(AliEmcalJetTask)
29 //________________________________________________________________________
30 AliEmcalJetTask::AliEmcalJetTask() :
31 AliAnalysisTaskSE("AliEmcalJetTask"),
32 fTracksName("Tracks"),
33 fCaloName("CaloClusters"),
41 fPhiMax(TMath::TwoPi()),
54 // Default constructor.
57 //________________________________________________________________________
58 AliEmcalJetTask::AliEmcalJetTask(const char *name) :
59 AliAnalysisTaskSE(name),
60 fTracksName("Tracks"),
61 fCaloName("CaloClusters"),
69 fPhiMax(TMath::TwoPi()),
82 // Standard constructor.
84 fBranchNames="ESD:AliESDRun.,AliESDHeader.,PrimaryVertex.";
87 //________________________________________________________________________
88 AliEmcalJetTask::~AliEmcalJetTask()
93 //________________________________________________________________________
94 void AliEmcalJetTask::UserCreateOutputObjects()
96 // Create user objects.
98 fJets = new TClonesArray("AliEmcalJet");
99 fJets->SetName(fJetsName);
102 //________________________________________________________________________
103 void AliEmcalJetTask::UserExec(Option_t *)
105 // Main loop, called for each event.
116 //________________________________________________________________________
117 void AliEmcalJetTask::Terminate(Option_t *)
119 // Called once at the end of the analysis.
122 //________________________________________________________________________
123 void AliEmcalJetTask::FindJets()
127 if (!fTracks && !fClus)
131 fastjet::JetAlgorithm jalgo(fastjet::kt_algorithm);
134 jalgo = fastjet::antikt_algorithm;
138 AliFJWrapper fjw(name, name);
139 fjw.SetAreaType(fastjet::active_area_explicit_ghosts);
141 fjw.SetAlgorithm(jalgo);
145 // get primary vertex
146 Double_t vertex[3] = {0, 0, 0};
147 fEvent->GetPrimaryVertex()->GetXYZ(vertex);
149 if ((fIsMcPart || fType == 0 || fType == 1) && fTracks) {
150 const Int_t Ntracks = fTracks->GetEntries();
151 for (Int_t iTracks = 0; iTracks < Ntracks; ++iTracks) {
152 AliVParticle *t = static_cast<AliVParticle*>(fTracks->At(iTracks));
155 if (fIsMcPart && fType == 1 && t->Charge() == 0)
157 if (fIsMcPart && fType == 2 && t->Charge() != 0)
159 if (t->Pt() < fMinJetTrackPt)
161 Double_t eta = t->Eta();
162 Double_t phi = t->Phi();
163 if ((eta<fEtaMin) && (eta>fEtaMax) &&
164 (phi<fPhiMin) && (phi<fPhiMax))
167 // offset of 100 for consistency with cluster ids
168 fjw.AddInputVector(t->Px(), t->Py(), t->Pz(), t->P(), iTracks + 100);
172 if ((fType == 0 || fType == 2) && fClus) {
173 const Int_t Nclus = fClus->GetEntries();
174 for (Int_t iClus = 0; iClus < Nclus; ++iClus) {
176 Double_t cEta=0,cPhi=0,cPt=0;
177 Double_t cPx=0,cPy=0,cPz=0;
179 AliEmcalParticle *ep = static_cast<AliEmcalParticle*>(fClus->At(iClus));
182 c = ep->GetCluster();
192 c = static_cast<AliVCluster*>(fClus->At(iClus));
196 c->GetMomentum(nP, vertex);
206 if (cPt < fMinJetClusPt)
208 if ((cEta<fEtaMin) && (cEta>fEtaMax) &&
209 (cPhi<fPhiMin) && (cPhi<fPhiMax))
211 // offset of 100 to skip ghost particles uid = -1
212 fjw.AddInputVector(cPx, cPy, cPz, TMath::Sqrt(cPx*cPx+cPy*cPy+cPz*cPz), -iClus - 100);
220 AliEMCALGeometry *geom = AliEMCALGeometry::GetInstance();
222 AliFatal(Form("%s: Can not create geometry", GetName()));
226 // loop over fastjet jets
227 std::vector<fastjet::PseudoJet> jets_incl = fjw.GetInclusiveJets();
228 for (UInt_t ij=0, jetCount=0; ij<jets_incl.size(); ++ij) {
229 if (jets_incl[ij].perp()<fMinJetPt)
231 if (fjw.GetJetArea(ij)<fMinJetArea)
234 AliEmcalJet *jet = new ((*fJets)[jetCount])
235 AliEmcalJet(jets_incl[ij].perp(), jets_incl[ij].eta(), jets_incl[ij].phi(), jets_incl[ij].m());
237 // loop over constituents
238 std::vector<fastjet::PseudoJet> constituents(fjw.GetJetConstituents(ij));
239 jet->SetNumberOfTracks(constituents.size());
240 jet->SetNumberOfClusters(constituents.size());
244 Double_t neutralE = 0;
255 for(UInt_t ic = 0; ic < constituents.size(); ++ic) {
256 Int_t uid = constituents[ic].user_index();
258 if ((uid == -1) /*&& (constituents[ic].kt2() < 1e-25)*/) { //ghost particle
260 Double_t gphi = constituents[ic].phi();
262 gphi += TMath::TwoPi();
263 gphi *= TMath::RadToDeg();
264 Double_t geta = constituents[ic].eta();
265 if ((gphi > geom->GetArm1PhiMin()) && (gphi < geom->GetArm1PhiMax()) &&
266 (geta > geom->GetArm1EtaMin()) && (geta < geom->GetArm1EtaMax()))
268 } else if ((uid > 0) && fTracks) { // track constituent
269 Int_t tid = uid - 100;
270 AliVParticle *t = static_cast<AliVParticle*>(fTracks->At(tid));
273 Double_t cEta = t->Eta();
274 Double_t cPhi = t->Phi();
275 Double_t cPt = t->Pt();
276 Double_t cP = t->P();
277 if (t->Charge() == 0) {
288 if (fIsMcPart || t->GetLabel() == 100) // check if MC particle
292 cPhi += TMath::TwoPi();
293 cPhi *= TMath::RadToDeg();
294 if ((cPhi > geom->GetArm1PhiMin()) && (cPhi < geom->GetArm1PhiMax()) &&
295 (cEta > geom->GetArm1EtaMin()) && (cEta < geom->GetArm1EtaMax())) {
300 jet->AddTrackAt(tid, nt);
302 } else if (fClus) { // cluster constituent
303 Int_t cid = -uid - 100;
305 Double_t cEta=0,cPhi=0,cPt=0,cP=0;
307 AliEmcalParticle *ep = static_cast<AliEmcalParticle*>(fClus->At(cid));
310 c = ep->GetCluster();
318 c = static_cast<AliVCluster*>(fClus->At(cid));
322 c->GetMomentum(nP, vertex);
333 if (c->Chi2() == 100) // MC particle
337 cPhi += TMath::TwoPi();
338 cPhi *= TMath::RadToDeg();
339 if ((cPhi > geom->GetArm1PhiMin()) && (cPhi < geom->GetArm1PhiMax()) &&
340 (cEta > geom->GetArm1EtaMin()) && (cEta < geom->GetArm1EtaMax())) {
345 jet->AddClusterAt(cid, nc);
349 AliError(Form("%s: No logical way to end up here.", GetName()));
352 } /* end of constituent loop */
354 jet->SetNumberOfTracks(nt);
355 jet->SetNumberOfClusters(nc);
356 jet->SortConstituents();
357 jet->SetMaxNeutralPt(maxNe);
358 jet->SetMaxChargedPt(maxCh);
359 jet->SetNEF(neutralE / jet->E());
360 fastjet::PseudoJet area(fjw.GetJetAreaVector(ij));
361 jet->SetArea(area.perp());
362 jet->SetAreaEta(area.eta());
363 jet->SetAreaPhi(area.phi());
364 jet->SetNumberOfCharged(ncharged);
365 jet->SetNumberOfNeutrals(nneutral);
368 jet->SetPtEmc(emcpt);
371 jet->SetAreaEmc(fjw.GetJetArea(ij) * gemc / gall);
374 if ((jet->Phi() > geom->GetArm1PhiMin() * TMath::DegToRad()) &&
375 (jet->Phi() < geom->GetArm1PhiMax() * TMath::DegToRad()) &&
376 (jet->Eta() > geom->GetArm1EtaMin()) &&
377 (jet->Eta() < geom->GetArm1EtaMax()))
378 jet->SetAxisInEmcal(kTRUE);
384 //________________________________________________________________________
385 Bool_t AliEmcalJetTask::DoInit()
387 // Init. Return true if successful.
389 // get input collections
390 AliAnalysisManager *am = AliAnalysisManager::GetAnalysisManager();
393 fEvent = InputEvent();
395 AliError(Form("%s: Could not retrieve event! Returning", GetName()));
399 // add jets to event if not yet there
400 if (!(fEvent->FindListObject(fJetsName)))
401 fEvent->AddObject(fJets);
403 AliError(Form("%s: Object with name %s already in event! Returning", GetName(), fJetsName.Data()));
407 if (fTracksName == "Tracks")
408 am->LoadBranch("Tracks");
409 if (!fTracks && !fTracksName.IsNull()) {
410 fTracks = dynamic_cast<TClonesArray*>(fEvent->FindListObject(fTracksName));
412 AliError(Form("%s: Pointer to tracks %s == 0", GetName(), fTracksName.Data()));
417 TClass cls(fTracks->GetClass()->GetName());
418 if (cls.InheritsFrom("AliMCParticle"))
422 if (fCaloName == "CaloClusters")
423 am->LoadBranch("CaloClusters");
424 if (!fClus && !fCaloName.IsNull()) {
425 fClus = dynamic_cast<TClonesArray*>(fEvent->FindListObject(fCaloName));
427 AliError(Form("%s: Pointer to clus %s == 0", GetName(), fCaloName.Data()));
432 TClass cls(fClus->GetClass()->GetName());
433 if (cls.InheritsFrom("AliEmcalParticle"))