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## Rivet analyses reference

### TOPAZ_1993_I361661

Measurement of event shapes at $E_{\text{CMS}}=58$ GeV
Experiment: TOPAZ (Tristan)
Inspire ID: 361661
Status: VALIDATED
Authors:
• Peter Richardson
References:
• Phys.Lett. B304 (1993) 373-380, 1993
Beams: e- e+
Beam energies: (29.0, 29.0) GeV
Run details:
Measurement of the hadronic event shapes in $e^+e^-$ collisions by TOPAZ at 58 GeV.
  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 78 79 80 81 82 83 84 85 86 87 88 // -*- C++ -*- #include "Rivet/Analysis.hh" #include "Rivet/Projections/FinalState.hh" #include "Rivet/Projections/Thrust.hh" #include "Rivet/Projections/FastJets.hh" #include "Rivet/Projections/Hemispheres.hh" namespace Rivet { /// @brief Thrust, heavy jet mass, and y3 at 58 GeV class TOPAZ_1993_I361661 : public Analysis { public: /// Constructor DEFAULT_RIVET_ANALYSIS_CTOR(TOPAZ_1993_I361661); /// @name Analysis methods //@{ /// Book histograms and initialise projections before the run void init() { const FinalState fs; declare(fs, "FS"); declare(FastJets(fs, FastJets::DURHAM, 0.7), "DurhamJets"); const Thrust thrust(fs); declare(thrust, "Thrust"); declare(Hemispheres(thrust), "Hemispheres"); // Book histograms book(_h_thrust, 1, 1, 1); book(_h_rho , 2, 1, 1); book(_h_y23 , 3, 1, 1); } /// Perform the per-event analysis void analyze(const Event& event) { // First, veto on leptonic events by requiring at least 4 charged FS particles const FinalState& fs = apply(event, "FS"); const size_t numParticles = fs.particles().size(); // Even if we only generate hadronic events, we still need a cut on numCharged >= 2. if (numParticles < 2) { MSG_DEBUG("Failed leptonic event cut"); vetoEvent; } // thrust const Thrust& thrust = apply(event, "Thrust"); _h_thrust->fill(-log(1.-thrust.thrust())); // jet mass const Hemispheres& hemi = apply(event, "Hemispheres"); _h_rho->fill(-log(hemi.scaledM2high())); // Jets const FastJets& durjet = apply(event, "DurhamJets"); if(numParticles>=3) if (durjet.clusterSeq()) _h_y23->fill(-log(durjet.clusterSeq()->exclusive_ymerge_max(2))); } /// Normalise histograms etc., after the run void finalize() { normalize(_h_thrust); normalize(_h_rho); normalize(_h_y23); } //@} /// @name Histograms //@{ Histo1DPtr _h_thrust,_h_rho,_h_y23; //@} }; // The hook for the plugin system DECLARE_RIVET_PLUGIN(TOPAZ_1993_I361661); }