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"),
26 fPionMassClusters(kFALSE),
32 //________________________________________________________________________
33 AliAnalysisTaskRhoMass::AliAnalysisTaskRhoMass(const char *name, Bool_t histo) :
34 AliAnalysisTaskRhoMassBase(name, histo),
37 fPionMassClusters(kFALSE),
43 //________________________________________________________________________
44 void AliAnalysisTaskRhoMass::UserCreateOutputObjects()
46 // User create output objects, called at the beginning of the analysis.
51 AliAnalysisTaskRhoMassBase::UserCreateOutputObjects();
53 fHistMdAreavsCent = new TH2F("fHistMdAreavsCent", "fHistMdAreavsCent", 101, -1, 100, fNbins, fMinBinPt, fMaxBinPt/2.);
54 fHistMdAreavsCent->GetXaxis()->SetTitle("Centrality (%)");
55 fHistMdAreavsCent->GetYaxis()->SetTitle("#rho_{m} (GeV/c * rad^{-1})");
56 fOutput->Add(fHistMdAreavsCent);
60 //________________________________________________________________________
61 Bool_t AliAnalysisTaskRhoMass::Run()
65 fOutRhoMass->SetVal(0);
66 if (fOutRhoMassScaled)
67 fOutRhoMassScaled->SetVal(0);
72 const Int_t Njets = fJets->GetEntries();
74 Int_t maxJetIds[] = {-1, -1};
75 Float_t maxJetPts[] = { 0, 0};
77 if (fNExclLeadJets > 0) {
78 for (Int_t ij = 0; ij < Njets; ++ij) {
79 AliEmcalJet *jet = static_cast<AliEmcalJet*>(fJets->At(ij));
81 AliError(Form("%s: Could not receive jet %d", GetName(), ij));
88 if (jet->Pt() > maxJetPts[0]) {
89 maxJetPts[1] = maxJetPts[0];
90 maxJetIds[1] = maxJetIds[0];
91 maxJetPts[0] = jet->Pt();
93 } else if (jet->Pt() > maxJetPts[1]) {
94 maxJetPts[1] = jet->Pt();
98 if (fNExclLeadJets < 2) {
104 static Double_t rhomvec[999];
105 static Double_t Evec[999];
106 static Double_t Mvec[999];
109 // push all jets within selected acceptance into stack
110 for (Int_t iJets = 0; iJets < Njets; ++iJets) {
112 // exlcuding lead jets
113 if (iJets == maxJetIds[0] || iJets == maxJetIds[1])
116 AliEmcalJet *jet = static_cast<AliEmcalJet*>(fJets->At(iJets));
118 AliError(Form("%s: Could not receive jet %d", GetName(), iJets));
125 // Double_t sumM = GetSumMConstituents(jet);
126 // Double_t sumPt = GetSumPtConstituents(jet);
127 if(jet->Area()>0.) {// && (jet->M()*jet->M() + jet->Pt()*jet->Pt())>0.) {
128 //rhomvec[NjetAcc] = (TMath::Sqrt(sumM*sumM + sumPt*sumPt) - sumPt ) / jet->Area();
129 // rhomvec[NjetAcc] = (TMath::Sqrt(jet->M()*jet->M() + jet->Pt()*jet->Pt()) - jet->Pt() ) / jet->Area();
130 rhomvec[NjetAcc] = GetMd(jet) / jet->Area();
131 fHistMdAreavsCent->Fill(fCent,rhomvec[NjetAcc]);
132 Evec[NjetAcc] = jet->E();
133 Mvec[NjetAcc] = jet->M();
140 Double_t rhom = TMath::Median(NjetAcc, rhomvec);
141 fOutRhoMass->SetVal(rhom);
143 Int_t Ntracks = fTracks->GetEntries();
144 Double_t meanM = TMath::Mean(NjetAcc, Mvec);
145 Double_t meanE = TMath::Mean(NjetAcc, Evec);
147 if(meanM>0.) gamma = meanE/meanM;
148 fHistGammaVsNtrack->Fill(Ntracks,gamma);
150 if (fOutRhoMassScaled) {
151 Double_t rhomScaled = rhom * GetScaleFactor(fCent);
152 fOutRhoMassScaled->SetVal(rhomScaled);
159 //________________________________________________________________________
160 Double_t AliAnalysisTaskRhoMass::GetSumMConstituents(AliEmcalJet *jet) {
165 for(Int_t icc=0; icc<jet->GetNumberOfTracks(); icc++) {
166 vp = static_cast<AliVParticle*>(jet->TrackAt(icc, fTracks));
173 //________________________________________________________________________
174 Double_t AliAnalysisTaskRhoMass::GetSumPtConstituents(AliEmcalJet *jet) {
179 for(Int_t icc=0; icc<jet->GetNumberOfTracks(); icc++) {
180 vp = static_cast<AliVParticle*>(jet->TrackAt(icc, fTracks));
187 //________________________________________________________________________
188 Double_t AliAnalysisTaskRhoMass::GetMd(AliEmcalJet *jet) {
189 //get md as defined in http://arxiv.org/pdf/1211.2811.pdf
198 for(Int_t icc=0; icc<jet->GetNumberOfTracks(); icc++) {
199 vp = static_cast<AliVParticle*>(jet->TrackAt(icc, fTracks));
201 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)
202 else if(fJetRhoMassType==kMdP) sum += TMath::Sqrt(vp->M()*vp->M() + vp->P()*vp->P()) - vp->P();
203 else if(fJetRhoMassType==kMd4) {
214 for(Int_t icc=0; icc<jet->GetNumberOfClusters(); icc++) {
215 vp = static_cast<AliVCluster*>(jet->ClusterAt(icc, fCaloClusters));
217 TLorentzVector nPart;
218 vp->GetMomentum(nPart, fVertex);
220 if(fPionMassClusters) m = 0.13957;
221 if(fJetRhoMassType==kMd) sum += TMath::Sqrt(m*m + nPart.Pt()*nPart.Pt()) - nPart.Pt();
222 else if(fJetRhoMassType==kMdP) sum += TMath::Sqrt(nPart.M()*nPart.M() + nPart.P()*nPart.P()) - nPart.P();
223 else if(fJetRhoMassType==kMd4) {
232 if(fJetRhoMassType==kMd4) {
233 Double_t pt = TMath::Sqrt(px*px + py*py);
234 Double_t m2 = E*E - pt*pt - pz*pz;
235 sum = TMath::Sqrt(m2 + pt*pt) - pt;