3 // Calculation of rho mass from a collection of jets.
4 // If scale function is given the scaled rho will be exported
5 // with the name as "fOutRhoMassName".Apppend("_Scaled").
9 #include "AliAnalysisTaskRhoMass.h"
11 #include <TClonesArray.h>
14 #include "AliAnalysisManager.h"
15 #include "AliEmcalJet.h"
17 #include "AliRhoParameter.h"
19 ClassImp(AliAnalysisTaskRhoMass)
21 //________________________________________________________________________
22 AliAnalysisTaskRhoMass::AliAnalysisTaskRhoMass() :
23 AliAnalysisTaskRhoMassBase("AliAnalysisTaskRhoMass"),
31 //________________________________________________________________________
32 AliAnalysisTaskRhoMass::AliAnalysisTaskRhoMass(const char *name, Bool_t histo) :
33 AliAnalysisTaskRhoMassBase(name, histo),
41 //________________________________________________________________________
42 void AliAnalysisTaskRhoMass::UserCreateOutputObjects()
44 // User create output objects, called at the beginning of the analysis.
49 AliAnalysisTaskRhoMassBase::UserCreateOutputObjects();
51 fHistMdAreavsCent = new TH2F("fHistMdAreavsCent", "fHistMdAreavsCent", 101, -1, 100, fNbins, fMinBinPt, fMaxBinPt/2.);
52 fHistMdAreavsCent->GetXaxis()->SetTitle("Centrality (%)");
53 fHistMdAreavsCent->GetYaxis()->SetTitle("#rho_{m} (GeV/c * rad^{-1})");
54 fOutput->Add(fHistMdAreavsCent);
58 //________________________________________________________________________
59 Bool_t AliAnalysisTaskRhoMass::Run()
63 fOutRhoMass->SetVal(0);
64 if (fOutRhoMassScaled)
65 fOutRhoMassScaled->SetVal(0);
70 const Int_t Njets = fJets->GetEntries();
72 Int_t maxJetIds[] = {-1, -1};
73 Float_t maxJetPts[] = { 0, 0};
75 if (fNExclLeadJets > 0) {
76 for (Int_t ij = 0; ij < Njets; ++ij) {
77 AliEmcalJet *jet = static_cast<AliEmcalJet*>(fJets->At(ij));
79 AliError(Form("%s: Could not receive jet %d", GetName(), ij));
86 if (jet->Pt() > maxJetPts[0]) {
87 maxJetPts[1] = maxJetPts[0];
88 maxJetIds[1] = maxJetIds[0];
89 maxJetPts[0] = jet->Pt();
91 } else if (jet->Pt() > maxJetPts[1]) {
92 maxJetPts[1] = jet->Pt();
96 if (fNExclLeadJets < 2) {
102 static Double_t rhomvec[999];
103 static Double_t Evec[999];
104 static Double_t Mvec[999];
107 // push all jets within selected acceptance into stack
108 for (Int_t iJets = 0; iJets < Njets; ++iJets) {
110 // exlcuding lead jets
111 if (iJets == maxJetIds[0] || iJets == maxJetIds[1])
114 AliEmcalJet *jet = static_cast<AliEmcalJet*>(fJets->At(iJets));
116 AliError(Form("%s: Could not receive jet %d", GetName(), iJets));
123 // Double_t sumM = GetSumMConstituents(jet);
124 // Double_t sumPt = GetSumPtConstituents(jet);
125 if(jet->Area()>0.) {// && (jet->M()*jet->M() + jet->Pt()*jet->Pt())>0.) {
126 //rhomvec[NjetAcc] = (TMath::Sqrt(sumM*sumM + sumPt*sumPt) - sumPt ) / jet->Area();
127 // rhomvec[NjetAcc] = (TMath::Sqrt(jet->M()*jet->M() + jet->Pt()*jet->Pt()) - jet->Pt() ) / jet->Area();
128 rhomvec[NjetAcc] = GetMd(jet) / jet->Area();
129 fHistMdAreavsCent->Fill(fCent,rhomvec[NjetAcc]);
130 Evec[NjetAcc] = jet->E();
131 Mvec[NjetAcc] = jet->M();
138 Double_t rhom = TMath::Median(NjetAcc, rhomvec);
139 fOutRhoMass->SetVal(rhom);
141 Int_t Ntracks = fTracks->GetEntries();
142 Double_t meanM = TMath::Mean(NjetAcc, Mvec);
143 Double_t meanE = TMath::Mean(NjetAcc, Evec);
145 if(meanM>0.) gamma = meanE/meanM;
146 fHistGammaVsNtrack->Fill(Ntracks,gamma);
148 if (fOutRhoMassScaled) {
149 Double_t rhomScaled = rhom * GetScaleFactor(fCent);
150 fOutRhoMassScaled->SetVal(rhomScaled);
157 //________________________________________________________________________
158 Double_t AliAnalysisTaskRhoMass::GetSumMConstituents(AliEmcalJet *jet) {
163 for(Int_t icc=0; icc<jet->GetNumberOfTracks(); icc++) {
164 vp = static_cast<AliVParticle*>(jet->TrackAt(icc, fTracks));
171 //________________________________________________________________________
172 Double_t AliAnalysisTaskRhoMass::GetSumPtConstituents(AliEmcalJet *jet) {
177 for(Int_t icc=0; icc<jet->GetNumberOfTracks(); icc++) {
178 vp = static_cast<AliVParticle*>(jet->TrackAt(icc, fTracks));
185 //________________________________________________________________________
186 Double_t AliAnalysisTaskRhoMass::GetMd(AliEmcalJet *jet) {
187 //get md as defined in http://arxiv.org/pdf/1211.2811.pdf
194 for(Int_t icc=0; icc<jet->GetNumberOfTracks(); icc++) {
195 vp = static_cast<AliVParticle*>(jet->TrackAt(icc, fTracks));
197 if(fJetRhoMassType==kMd) sum += TMath::Sqrt(vp->M()*vp->M() + vp->Pt()*vp->Pt()) - vp->Pt(); //sqrt(E^2-P^2+pt^2)=sqrt(E^2-pz^2)
198 else if(fJetRhoMassType==kMdP) sum += TMath::Sqrt(vp->M()*vp->M() + vp->P()*vp->P()) - vp->P();
199 else if(fJetRhoMassType==kMd4) {
206 if(fJetRhoMassType==kMd4) {
207 Double_t pt = TMath::Sqrt(px*px + py*py);
208 Double_t m2 = E*E - pt*pt - pz*pz;
209 sum = TMath::Sqrt(m2 + pt*pt) - pt;