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Rivet analyses reference

TASSO_1989_I277658

Hadronic charged multiplicity measurement between 14 and 43.6 GeV
Experiment: TASSO (PEP)
Inspire ID: 277658
Status: VALIDATED
Authors:
  • Peter Richardson
References:
  • Z.Phys. C45 (1989) 193
Beams: e+ e-
Beam energies: (7.0, 7.0); (11.0, 11.0); (17.4, 17.4); (21.8, 21.8) GeV
Run details:
  • Hadronic e+ e- events generated below the Z pole

The charged particle multiplicity distribution of hadronic $e^+e^-$ events as measured between 14 and 43.6 GeV using the TASSO detector at PEP.

Source code: TASSO_1989_I277658.cc
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// -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/ChargedFinalState.hh"

namespace Rivet {


  /// @brief Add a short analysis description here
  class TASSO_1989_I277658 : public Analysis {
  public:

    /// Constructor
    DEFAULT_RIVET_ANALYSIS_CTOR(TASSO_1989_I277658);


    /// @name Analysis methods
    //@{

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

      int offset = 0;
      if(fuzzyEquals(sqrtS()/GeV,14.0)) {
	offset = 1;
      }
      else if(fuzzyEquals(sqrtS()/GeV,22.0)) {
	offset = 2;
      }
      else if(fuzzyEquals(sqrtS()/GeV,34.8)) {
	offset = 3;
      }
      else if(fuzzyEquals(sqrtS()/GeV,43.6)) {
	offset = 4;
      }
      else {
        MSG_WARNING("CoM energy of events sqrt(s) = " << sqrtS()/GeV
                    << " doesn't match any available analysis energy .");
      }
      _histCh = bookHisto1D(5, 1, offset); 
      _histTotal = bookProfile1D(2, 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());
      _histCh->fill(cfs.size(), event.weight());
      _histTotal->fill(sqrtS(),cfs.size(),event.weight());
    }


    /// Normalise histograms etc., after the run
    void finalize() {
      scale(_histCh, 2.0/sumOfWeights()); // bin width (2)
    }

    //@}


  private:

    /// @name Histograms
    //@{
    Histo1DPtr _histCh;
    Profile1DPtr _histTotal;
    //@}
  };


  // The hook for the plugin system
  DECLARE_RIVET_PLUGIN(TASSO_1989_I277658);


}