Rivet analyses

Charged Hadron multiplicity at 29 GeV

Experiment: HRS (PEP)

Inspire ID: 18502

Status: VALIDATED

Authors: - Peter Richardson

References: - Phys.Rev. D34 (1986) 3304

Beams: e+ e-

Beam energies: (14.5, 14.5)GeV

Run details: - Hadronic e+e- events at $\sqrt{s} = 29.$ GeV

The charged particle multiplicity distribution of hadronic e+e− events, as measured at $\sqrt{s} = 29.$ GeV using the HRS detector at PEP.

Source code:HRS_1986_I18502.cc

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

namespace Rivet {


  /// @brief Charged hadron multiplicity at 29 GeV from HRS experiment
  class HRS_1986_I18502 : public Analysis {
  public:

    /// Constructor
    RIVET_DEFAULT_ANALYSIS_CTOR(HRS_1986_I18502);


    /// @name Analysis methods
    /// @{

    /// Book histograms and initialise projections before the run
    void init() {
      const ChargedFinalState cfs;
      declare(cfs, "CFS");

      book(_histChTot, 1, 1, 1);
      book(_histAver,  3, 1, 1);
    }


    /// Perform the per-event analysis
    void analyze(const Event& event) {
      const FinalState& cfs = apply<FinalState>(event, "CFS");
      MSG_DEBUG("Total charged multiplicity = " << cfs.size());
      _histChTot->fill(cfs.size());
      _histAver->fill(29, cfs.size());
    }


    /// Normalise histograms etc., after the run
    void finalize() {
      scale(_histChTot, 100.0/sumOfWeights()); // and %age (100)
    }

    /// @}


  private:

    /// @name Histograms
    /// @{
    BinnedHistoPtr<int> _histChTot;
    BinnedProfilePtr<int> _histAver;
    /// @}
  };


  RIVET_DECLARE_PLUGIN(HRS_1986_I18502);


}