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richard |
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#include <TCanvas.h>
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#include <TTree.h>
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#include <TFile.h>
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#include <TMath.h>
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#include <TH1D.h>
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#include <TLorentzVector.h>
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#include <iostream>
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#include "../HiForest_V2_latest/hiForest.h"
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#include "alexUtils.h"
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void photonMass()
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{
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TString data = "/mnt/hadoop/cms/store/user/luck/pA2013_forests/PA2013_HiForest_Express_r210614_autoforest_v1.root";
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HiForest *forest = new HiForest(data.Data());
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TH1D *hMass = new TH1D("hMass",";Invariant Mass (GeV)",100,0,200);
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int nentries = forest->GetEntries();
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for (Long64_t jentry = 0 ; jentry < nentries; jentry++)
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{
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if (jentry % 1000 == 0)
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std::cout << jentry << " / " << nentries << std::endl;
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forest->GetEntry(jentry);
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for (int j = 0; j < forest->photon.nPhotons; j++)
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{
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for(int i = j+1; i < forest->photon.nPhotons; i++)
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{
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TLorentzVector v1, v2, vSum;
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v1.SetPtEtaPhiE( forest->photon.pt[i],
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forest->photon.eta[i],
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forest->photon.phi[i],
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forest->photon.energy[i]);
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v2.SetPtEtaPhiE( forest->photon.pt[j],
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forest->photon.eta[j],
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forest->photon.phi[j],
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forest->photon.energy[j]);
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vSum = v1+v2;
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hMass->Fill( vSum.M() );
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}
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}
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}
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hMass->Draw("E");
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}
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