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 #include "AliAnalysisTaskDiJets.h"
19 #include "AliAODEvent.h"
20 #include "AliAODJet.h"
21 #include "AliAODDiJet.h"
22 #include <TClonesArray.h>
23 #include <TLorentzVector.h>
27 ClassImp(AliAnalysisTaskDiJets)
29 ////////////////////////////////////////////////////////////////////////
31 AliAnalysisTaskDiJets::AliAnalysisTaskDiJets():
43 // Default constructor
46 //----------------------------------------------------------------------
47 AliAnalysisTaskDiJets::AliAnalysisTaskDiJets(const char* name):
48 AliAnalysisTaskSE(name),
59 // Default constructor
60 DefineOutput(1, TList::Class());
63 //----------------------------------------------------------------------
64 void AliAnalysisTaskDiJets::UserCreateOutputObjects()
66 // Create the output container
68 if (fDebug > 1) printf("AnalysisTaskDiJets::CreateOutPutData() \n");
69 fDiJets = new TClonesArray("AliAODDiJet", 0);
70 fDiJets->SetName("dijets");
71 AddAODBranch("TClonesArray", &fDiJets);
73 if (!fHistList) fHistList = new TList();
74 Float_t pi=TMath::Pi();
75 gStyle->SetPalette(1);
77 fH1DeltaPt = new TH1F("DeltaPt","Difference between the jets' Pt;#Deltap_{T} (GeV/c);Entries",150,0.,150.);
78 fH1DeltaPt->SetMarkerSize(0.6);
79 fH1DeltaPt->SetMarkerColor(4);
80 fH1DeltaPt->SetMarkerStyle(21);
81 fH1DeltaPt->SetOption("E");
83 fH1DeltaPhi = new TH1F("DeltaPhi","Difference in the azimuthal angle;#Delta#phi;Entries",100,0.,pi);
84 fH1DeltaPhi->SetMarkerSize(0.6);
85 fH1DeltaPhi->SetMarkerColor(4);
86 fH1DeltaPhi->SetMarkerStyle(21);
87 fH1DeltaPhi->SetOption("E");
89 fH1PhiImbal = new TH1F("PhiImb","Phi imbalance;#phi;Entries",100,-pi,pi);
90 fH1PhiImbal->SetMarkerSize(0.6);
91 fH1PhiImbal->SetMarkerColor(4);
92 fH1PhiImbal->SetMarkerStyle(21);
93 fH1PhiImbal->SetOption("E");
95 fH1Asym = new TH1F("Asym","Pt asymmetry;#Deltap_{T}/(p_{T,1}+p_{T,2});Entries",50,0.,1.);
96 fH1Asym->SetMarkerSize(0.6);
97 fH1Asym->SetMarkerColor(4);
98 fH1Asym->SetMarkerStyle(21);
99 fH1Asym->SetOption("E");
101 fH2Pt2vsPt1 = new TH2F("Pt2vsPt1","Pt2 versus Pt1;p_{T,1} (GeV/c);p_{T,2} (GeV/c)",250,0.,250.,250,0.,250.);
102 fH2Pt2vsPt1->SetOption("cont0");
104 fH2DifvsSum = new TH2F("DifvsSum","Pt difference vs Pt sum;p_{T,1}+p_{T,2} (GeV/c);#Deltap_{T} (GeV/c)",400,0.,400.,150,0.,150.);
105 fH2DifvsSum->SetOption("cont0");
107 fHistList->Add(fH1DeltaPt);
108 fHistList->Add(fH1DeltaPhi);
109 fHistList->Add(fH1PhiImbal);
110 fHistList->Add(fH1Asym);
111 fHistList->Add(fH2Pt2vsPt1);
112 fHistList->Add(fH2DifvsSum);
115 //----------------------------------------------------------------------
116 void AliAnalysisTaskDiJets::Init()
119 if (fDebug > 1) printf("AnalysisTaskDiJets::Init() \n");
122 //----------------------------------------------------------------------
123 void AliAnalysisTaskDiJets::UserExec(Option_t */*option*/)
125 // Execute analysis for current event
128 AliAODEvent* aod = dynamic_cast<AliAODEvent*> (InputEvent());
131 // We do not have an input AOD, look in the output
134 if (fDebug >1) printf("%s:%d AODEvent not found in the Output",(char*)__FILE__,__LINE__);
139 TClonesArray* jets = aod->GetJets();
141 // N.B. if we take the aod from the output this is always
142 // empty and since it is the same as fDiJets
143 fDiJetsIn = (TClonesArray*) (aod->GetList()->FindObject("dijets"));
146 if (fDebug >1) printf("Found %d dijets in old list \n", fDiJetsIn->GetEntries());
147 AliAODJet* jj1, *jj2;
150 if (fDiJetsIn->GetEntries() > 0) {
151 testJ = (AliAODDiJet*) (fDiJetsIn->At(0));
159 Int_t nj = jets->GetEntriesFast();
160 if (fDebug >1) printf("There are %5d jets in the event \n", nj);
163 PostData(1, fHistList);
166 AliAODJet* jet1 = (AliAODJet*) (jets->At(0));
167 TLorentzVector v1 = *(jet1->MomentumVector());
168 AliAODJet* jet2 = (AliAODJet*) (jets->At(1));
169 TLorentzVector v2 = *(jet2->MomentumVector());
170 TLorentzVector v = v1 + v2;
171 Int_t ndi = fDiJets->GetEntriesFast();
172 TClonesArray &lref = *fDiJets;
173 new(lref[ndi]) AliAODDiJet(v);
174 AliAODDiJet* dijet = (AliAODDiJet*) (fDiJets->At(ndi));
175 dijet->SetJetRefs(jet1, jet2);
177 fH1DeltaPt->Fill(jet1->Pt()-jet2->Pt());
178 fH1DeltaPhi->Fill(dijet->DeltaPhi());
179 fH1PhiImbal->Fill(dijet->PhiImbalance());
180 fH1Asym->Fill((jet1->Pt()-jet2->Pt())/(jet1->Pt()+jet2->Pt()));
181 fH2Pt2vsPt1->Fill(jet1->Pt(),jet2->Pt());
182 fH2DifvsSum->Fill(jet1->Pt()+jet2->Pt(),jet1->Pt()-jet2->Pt());
184 PostData(1, fHistList);
188 //----------------------------------------------------------------------
189 void AliAnalysisTaskDiJets::Terminate(Option_t */*option*/)
191 // Terminate analysis
193 if (fDebug > 1) printf("AnalysisDiJets: Terminate() \n");