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## Rivet analyses reference

### OPAL_1992_I321190

Hadronic Z decay charged multiplicity measurement
Experiment: OPAL (LEP 1)
Inspire ID: 321190
Status: VALIDATED
Authors:
• Peter Richardson
References:
• Z.Phys. C53 (1992) 539-554
Beams: e+ e-
Beam energies: (45.6, 45.6) GeV
Run details:
• Hadronic Z decay events generated on the Z pole ($\sqrt{s} = 91.2$ GeV)

The charged particle multiplicity distribution of hadronic Z decays, as measured on the peak of the Z resonance using the OPAL detector at LEP.

Source code: OPAL_1992_I321190.cc
  1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 // -*- C++ -*- #include "Rivet/Analysis.hh" #include "Rivet/Projections/ChargedFinalState.hh" namespace Rivet { /// @brief OPAL LEP1 charged multiplicity, code basically a copy of the ALEPH one /// @author Peter Richardson class OPAL_1992_I321190 : public Analysis { public: /// Constructor DEFAULT_RIVET_ANALYSIS_CTOR(OPAL_1992_I321190); /// @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 , 5, 1, 1); } /// Perform the per-event analysis void analyze(const Event& event) { const FinalState& cfs = apply(event, "CFS"); MSG_DEBUG("Total charged multiplicity = " << cfs.size()); _histChTot->fill(cfs.size(), 1.0); _histAver->fill(sqrtS(),cfs.size(),1.0); } /// Normalise histograms etc., after the run void finalize() { scale(_histChTot, 200.0/sumOfWeights()); // bin width (2) and %age (100) } //@} private: /// @name Histograms //@{ Histo1DPtr _histChTot; Profile1DPtr _histAver; //@} }; // The hook for the plugin system DECLARE_RIVET_PLUGIN(OPAL_1992_I321190); }