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## Rivet analyses reference

### TOPAZ_1997_I454183

Measurement of charged particle multiplicity vs thrust at $E_{\text{CMS}}=57.8$ GeV
Experiment: TOPAZ (Tristan)
Inspire ID: 454183
Status: UNVALIDATED
Authors:
• Peter Richardson
References:
• Phys.Lett. B413 (1997) 447-452
Beams: e- e+
Beam energies: (28.9, 28.9) GeV
Run details:
  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 // -*- C++ -*- #include "Rivet/Analysis.hh" #include "Rivet/Projections/ChargedFinalState.hh" #include "Rivet/Projections/Thrust.hh" namespace Rivet { /// @brief N charged vs thrust class TOPAZ_1997_I454183 : public Analysis { public: /// Constructor DEFAULT_RIVET_ANALYSIS_CTOR(TOPAZ_1997_I454183); /// @name Analysis methods //@{ /// Book histograms and initialise projections before the run void init() { // Initialise and register projections ChargedFinalState cfs; declare(cfs , "CFS"); declare(Thrust(cfs), "Thrust"); // Book histograms book(_p_charged ,3,1,1); book(_c_ncharged,1,1,1); } /// Perform the per-event analysis void analyze(const Event& event) { // First, veto on leptonic events by requiring at least 5 charged FS particles const ChargedFinalState& cfs = apply(event, "CFS"); const size_t numParticles = cfs.particles().size(); // Even if we only generate hadronic events, we still need a cut on numCharged >= 2. if (numParticles < 5) { MSG_DEBUG("Failed leptonic event cut"); vetoEvent; } MSG_DEBUG("Passed leptonic event cut"); // thrust const Thrust& thrust = apply(event, "Thrust"); _c_ncharged->fill(cfs.particles().size()); _p_charged->fill(-log(1.-thrust.thrust()),cfs.particles().size()); } /// Normalise histograms etc., after the run void finalize() { scale(_c_ncharged,1./sumOfWeights()); } //@} /// @name Histograms //@{ Profile1DPtr _p_charged; CounterPtr _c_ncharged; //@} }; // The hook for the plugin system DECLARE_RIVET_PLUGIN(TOPAZ_1997_I454183); }