CMS_2015_I1327224.cc

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// -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/FastJets.hh"
#include "Rivet/Tools/BinnedHistogram.hh"

namespace Rivet {
  class CMS_2015_I1327224 : public Analysis {
  public:

    CMS_2015_I1327224()
      : Analysis("CMS_2015_I1327224")
    { }

    void init() {
      FinalState fs;
      FastJets antikt(fs, FastJets::ANTIKT, 0.5);
      addProjection(antikt, "ANTIKT");
      _h_chi_dijet.addHistogram(4200., 8000., bookHisto1D(1, 1, 1));
      _h_chi_dijet.addHistogram(3600., 4200., bookHisto1D(2, 1, 1));
      _h_chi_dijet.addHistogram(3000., 3600., bookHisto1D(3, 1, 1));
      _h_chi_dijet.addHistogram(2400., 3000., bookHisto1D(4, 1, 1));
      _h_chi_dijet.addHistogram(1900., 2400., bookHisto1D(5, 1, 1));
    }

    void analyze(const Event& event) {
      const double weight = event.weight();
      const Jets& jets = applyProjection<JetAlg>(event, "ANTIKT").jetsByPt();
      if (jets.size() < 2) vetoEvent;

      FourMomentum j0(jets[0].momentum());
      FourMomentum j1(jets[1].momentum());
      double y0 = j0.rapidity();
      double y1 = j1.rapidity();
      if (fabs(y0 + y1) / 2. > 1.11) vetoEvent;

      double mjj = FourMomentum(j0 + j1).mass();
      if (mjj/GeV <1900) vetoEvent;

      double chi = exp(fabs(y0 - y1));
      if (chi >= 16.) vetoEvent;
     
      // Fill the histogram 
      _h_chi_dijet.fill(mjj/GeV, chi, weight);
    }

    void finalize() {
      foreach (Histo1DPtr hist, _h_chi_dijet.getHistograms()) {
        normalize(hist);
      }
    }

  private:
    BinnedHistogram<double> _h_chi_dijet;
  };

  // The hook for the plugin system
  DECLARE_RIVET_PLUGIN(CMS_2015_I1327224);
}