ATLAS_2014_I1288706.cc

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// -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/FinalState.hh" 
#include "Rivet/Projections/ZFinder.hh"
#include "Rivet/Particle.fhh"

namespace Rivet {


  class ATLAS_2014_I1288706 : public Analysis {
  public:

    /// Constructor
    ATLAS_2014_I1288706()
      : Analysis("ATLAS_2014_I1288706")
    {   
       _sumw_ext_mu_dressed = 0; 
       _sumw_mu_dressed     = 0;
       _sumw_el_dressed     = 0;     
     }


  public:

    /// @name Analysis methods
    //@{

    /// Book histograms and initialise projections before the run
    void init() {

       // Set up projections
       FinalState fs;

       ZFinder zfinder_ext_dressed_mu(fs, Cuts::abseta<2.4 && Cuts::pT>6.0*GeV, PID::MUON, 12.0*GeV, 66.0*GeV, 0.1);
       addProjection(zfinder_ext_dressed_mu, "ZFinder_ext_dressed_mu");       
       
       ZFinder zfinder_dressed_mu(fs, Cuts::abseta<2.4 && Cuts::pT>12*GeV, PID::MUON, 26.0*GeV, 66.0*GeV, 0.1);
       addProjection(zfinder_dressed_mu, "ZFinder_dressed_mu"); 
        
       ZFinder zfinder_dressed_el(fs, Cuts::abseta<2.4 && Cuts::pT>12*GeV, PID::ELECTRON, 26.0*GeV, 66.0*GeV, 0.1);
       addProjection(zfinder_dressed_el, "ZFinder_dressed_el");   
       
       _hist_ext_mu_dressed = bookHisto1D(1, 1, 1); // muon, dressed level, extended phase space
       _hist_mu_dressed     = bookHisto1D(2, 1, 1); // muon, dressed level, nominal phase space
       _hist_el_dressed     = bookHisto1D(2, 1, 2); // electron, dressed level, nominal phase space
    }


    /// Perform the per-event analysis
    void analyze(const Event& event) {
      const double weight = event.weight();
      const ZFinder& zfinder_ext_dressed_mu = applyProjection<ZFinder>(event, "ZFinder_ext_dressed_mu");
      const ZFinder& zfinder_dressed_mu     = applyProjection<ZFinder>(event, "ZFinder_dressed_mu"    );       
      const ZFinder& zfinder_dressed_el     = applyProjection<ZFinder>(event, "ZFinder_dressed_el"    ); 
      
      FillPlots(zfinder_ext_dressed_mu, _hist_ext_mu_dressed, 9.0, weight);
      FillPlots(zfinder_dressed_mu,     _hist_mu_dressed,    15.0, weight);      
      FillPlots(zfinder_dressed_el,     _hist_el_dressed,    15.0, weight);   
    }
    
    
    void FillPlots(const ZFinder& zfinder, Histo1DPtr hist, double leading_pT, double weight) {

      if(zfinder.bosons().size() != 1) return;

      const FourMomentum el1 = zfinder.particles()[0].momentum();
      const FourMomentum el2 = zfinder.particles()[1].momentum();

      if (el1.pT() > leading_pT*GeV || el2.pT() > leading_pT*GeV) {
        double mass = zfinder.bosons()[0].mass()/GeV;
        hist->fill(mass, weight);
      }    
    }


    /// Normalise histograms etc., after the run
    void finalize() {

      scale(_hist_ext_mu_dressed, crossSection()/sumOfWeights());
      scale(_hist_mu_dressed,     crossSection()/sumOfWeights());      
      scale(_hist_el_dressed,     crossSection()/sumOfWeights());
  
    }

    //@}


  private:

    // Data members like post-cuts event weight counters go here
     double _sumw_ext_mu_dressed;
     double _sumw_mu_dressed;  
     double _sumw_el_dressed; 

  private:

    /// @name Histograms
    //@{
    Histo1DPtr _hist_ext_mu_dressed;
    Histo1DPtr _hist_mu_dressed;    
    Histo1DPtr _hist_el_dressed;    
    //@}

  };



  // The hook for the plugin system
  DECLARE_RIVET_PLUGIN(ATLAS_2014_I1288706);

}