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Rivet analyses reference

TASSO_1980_I153511

Event shapes at 12 and 30 GeV
Experiment: TASSO (Petra)
Inspire ID: 153511
Status: VALIDATED
Authors:
• Peter Richardson
References:
• Phys.Lett. B94 (1980) 437-443, 1980
Beams: e- e+
Beam energies: (6.0, 6.0); (15.0, 15.0) GeV
Run details:
• $e^+e^-\to$hadrons

Sphericity, Aplanarity and scaled momentum distribution at 12 and 30 GeV

Source code: TASSO_1980_I153511.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 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 // -*- C++ -*- #include "Rivet/Analysis.hh" #include "Rivet/Projections/Sphericity.hh" #include "Rivet/Projections/ChargedFinalState.hh" #include "Rivet/Projections/Beam.hh" namespace Rivet { /// @brief Add a short analysis description here class TASSO_1980_I153511 : public Analysis { public: /// Constructor DEFAULT_RIVET_ANALYSIS_CTOR(TASSO_1980_I153511); /// @name Analysis methods //@{ /// Book histograms and initialise projections before the run void init() { declare(Beam(), "Beams"); const ChargedFinalState cfs; declare(cfs, "CFS"); // Thrust and sphericity declare(Sphericity(cfs), "Sphericity"); // Book histograms unsigned int ihist=0; if (fuzzyEquals(sqrtS()/GeV, 12., 1e-3)) { ihist=1; } else if (fuzzyEquals(sqrtS()/GeV, 30., 1e-3)) { ihist=2; } else MSG_ERROR("Beam energy not supported!"); book(_h_S , ihist, 1, 1); book(_h_A , 2+ihist, 1, 1); book(_h_x , 4+ihist, 1, 1); } /// Perform the per-event analysis void analyze(const Event& event) { // Get beams and average beam momentum const ParticlePair& beams = apply(event, "Beams").beams(); const double meanBeamMom = ( beams.first.p3().mod() + beams.second.p3().mod() ) / 2.0; const ChargedFinalState& cfs = apply(event, "CFS"); const Sphericity& sphericity = apply(event, "Sphericity"); _h_S->fill(sphericity.sphericity()); _h_A->fill(sphericity.aplanarity()); for (const Particle& p : cfs.particles()) { const Vector3 mom3 = p.p3(); const double mom = mom3.mod(); const double xp = mom/meanBeamMom; _h_x->fill(xp); } } /// Normalise histograms etc., after the run void finalize() { normalize(_h_S); normalize(_h_A); normalize(_h_x); } //@} /// @name Histograms //@{ Histo1DPtr _h_S,_h_A,_h_x; //@} }; // The hook for the plugin system DECLARE_RIVET_PLUGIN(TASSO_1980_I153511); }