UA5_1987_S1640666.cc

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// -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/TriggerUA5.hh"
#include "Rivet/Projections/ChargedFinalState.hh"

namespace Rivet {


  class UA5_1987_S1640666 : public Analysis {
  public:

    /// Constructor
    UA5_1987_S1640666()
      : Analysis("UA5_1987_S1640666")
    {
      _sumWPassed = 0;

    }

    /// Book histograms and initialise projections before the run
    void init() {
      addProjection(TriggerUA5(), "Trigger");
      addProjection(ChargedFinalState(-5.0, 5.0), "CFS");

      _hist_mean_nch = bookHisto1D(1, 1, 1);
      _hist_nch      = bookHisto1D(3, 1, 1);

    }


    /// Perform the per-event analysis
    void analyze(const Event& event) {
      // Trigger
      const TriggerUA5& trigger = applyProjection<TriggerUA5>(event, "Trigger");
      if (!trigger.nsdDecision()) vetoEvent;

      const double weight = event.weight();
      _sumWPassed += weight;

      // Count final state particles in several eta regions
      const int Nch = applyProjection<ChargedFinalState>(event, "CFS").size();

      // Fill histograms
      _hist_nch->fill(Nch, weight);
      _hist_mean_nch->fill(_hist_mean_nch->bin(0).midpoint(), Nch*weight);

    }


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

      scale(_hist_nch, 1.0/_sumWPassed);
      scale(_hist_mean_nch, 1.0/_sumWPassed);

    }

  private:

    double _sumWPassed;

    Histo1DPtr _hist_mean_nch;
    Histo1DPtr _hist_nch;

  };



  // The hook for the plugin system
  DECLARE_RIVET_PLUGIN(UA5_1987_S1640666);


}