D0_2000_S4480767.cc

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// -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/RivetAIDA.hh"
#include "Rivet/Tools/Logging.hh"
#include "Rivet/Projections/FinalState.hh"
#include "Rivet/Projections/WFinder.hh"

namespace Rivet {


  class D0_2000_S4480767 : public Analysis {
  public:

    /// @name Constructors etc.
    //@{

    /// Constructor
    D0_2000_S4480767()
      : Analysis("D0_2000_S4480767")
    {
      setNeedsCrossSection(true);
    }

    //@}


  public:

    /// @name Analysis methods
    //@{

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

      WFinder wf(-5, 5, 0.0*GeV, ELECTRON, 0.0*GeV, 200.0*GeV, 0.0*GeV, 0.2);
      addProjection(wf, "WFinder");

      _h_W_pT = bookHistogram1D(1, 1, 1);
    }


    /// Perform the per-event analysis
    void analyze(const Event& event) {
      const double weight = event.weight();

      const WFinder& wf = applyProjection<WFinder>(event, "WFinder");
      if (wf.size() == 0) vetoEvent;

      _h_W_pT->fill(wf.particles()[0].momentum().pT()/GeV, weight);
    }


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

      scale(_h_W_pT, crossSection()/sumOfWeights());

    }

    //@}


  private:

    /// @name Histograms
    //@{

    AIDA::IHistogram1D *_h_W_pT;
    //@}


  };



  // This global object acts as a hook for the plugin system
  AnalysisBuilder<D0_2000_S4480767> plugin_D0_2000_S4480767;


}