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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
  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 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 // -*- 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(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); }