CDF_2000_S4155203.cc

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// -*- C++ -*-
// CDF Z pT analysis

#include "Rivet/Analysis.hh"
#include "Rivet/RivetAIDA.hh"
#include "Rivet/Tools/Logging.hh"
#include "Rivet/Projections/ZFinder.hh"

namespace Rivet {


  /*
   * @brief CDF Run I Z pT in Drell-Yan events
   * @author Hendrik Hoeth
   */
  class CDF_2000_S4155203 : public Analysis {
  public:

    /// Constructor
    CDF_2000_S4155203()
      : Analysis("CDF_2000_S4155203"),
        _sumWeightSelected(0.0)
    {
      setBeams(PROTON, ANTIPROTON);
      setNeedsCrossSection(true);
    }


    /// @name Analysis methods
    //@{
 
    void init() {
      // Set up projections
      ZFinder zfinder(FinalState(), ELECTRON, 66.0*GeV, 116.0*GeV, 0.2);
      addProjection(zfinder, "ZFinder");

      // Book histogram
      _hist_zpt = bookHistogram1D(1, 1, 1);
    }
 
 
    /// Do the analysis
    void analyze(const Event& e) {
      const ZFinder& zfinder = applyProjection<ZFinder>(e, "ZFinder");
      if (zfinder.particles().size() != 1) {
        getLog() << Log::DEBUG << "No unique e+e- pair found" << endl;
        vetoEvent;
      }
   
      FourMomentum pZ = zfinder.particles()[0].momentum();
      getLog() << Log::DEBUG << "Dilepton mass = " << pZ.mass()/GeV << " GeV"  << endl;
      getLog() << Log::DEBUG << "Dilepton pT   = " << pZ.pT()/GeV << " GeV" << endl;
      _hist_zpt->fill(pZ.pT()/GeV, e.weight());
      _sumWeightSelected += e.weight();
    }
 
 
    void finalize() {
      scale(_hist_zpt, crossSection()/picobarn/_sumWeightSelected);
    }
 
    //@}


  private:

    double _sumWeightSelected;

    AIDA::IHistogram1D *_hist_zpt;

  };

 

  // This global object acts as a hook for the plugin system
  AnalysisBuilder<CDF_2000_S4155203> plugin_CDF_2000_S4155203;

}