E735_1998_S3905616.cc

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

#include "Rivet/Projections/TriggerCDFRun0Run1.hh"
#include "Rivet/Projections/TriggerUA5.hh"

namespace Rivet {


  /// @brief E735 charged multiplicity in NSD-triggered events
  class E735_1998_S3905616 : public Analysis {
  public:

    /// Constructor
    E735_1998_S3905616() : Analysis("E735_1998_S3905616") {
      setBeams(PROTON, ANTIPROTON);
      _sumWTrig = 0;
    }


    /// @name Analysis methods
    //@{

    void init() {
      // Projections
      /// @todo E735 trigger?
      //addProjection(TriggerCDFRun0Run1(), "Trigger");
      addProjection(TriggerUA5(), "Trigger");
      addProjection(ChargedFinalState(), "FS");

      // Histo
      _hist_multiplicity = bookHistogram1D(1, 1, 1);
    }


    void analyze(const Event& event) {
      //const bool trigger = applyProjection<TriggerCDFRun0Run1>(event, "Trigger").minBiasDecision();
      const bool trigger = applyProjection<TriggerUA5>(event, "Trigger").nsdDecision();
      if (!trigger) vetoEvent;
      const double weight = event.weight();
      _sumWTrig += weight;

      const ChargedFinalState& fs = applyProjection<ChargedFinalState>(event, "FS");
      const size_t numParticles = fs.particles().size();
      _hist_multiplicity->fill(numParticles, weight);
    }


    void finalize() {
      scale(_hist_multiplicity, 1/_sumWTrig);
    }

    //@}


  private:

    /// @name Weight counter
    //@{
    double _sumWTrig;
    //@}

    /// @name Histograms
    //@{
    AIDA::IHistogram1D* _hist_multiplicity;
    //@}

  };



  // This global object acts as a hook for the plugin system
  AnalysisBuilder<E735_1998_S3905616> plugin_E735_1998_S3905616;

}