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## Rivet analyses reference

Spectra of $\rho^0$ and $K^{*\pm}$ in $e^+e^-$ collisions at 35 GeV
Inspire ID: 203145
Status: VALIDATED
Authors:
• Peter Richardson
References:
• Phys.Lett. B145 (1984) 441-447, 1984
Beams: e+ e-
Beam energies: (17.5, 17.5) GeV
Run details:
Measurement of the $\rho^0$ and $K^{*\pm}$ spectra in $e^+e^-$ collisions for centre-of-mass energy 35 GeV by the JADE experiment at Petra.
  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 // -*- C++ -*- #include "Rivet/Analysis.hh" #include "Rivet/Projections/UnstableParticles.hh" #include "Rivet/Projections/Beam.hh" namespace Rivet { /// @brief rho0 and K*+/- spectra at 35 GeV class JADE_1984_I203145 : public Analysis { public: /// Constructor DEFAULT_RIVET_ANALYSIS_CTOR(JADE_1984_I203145); /// @name Analysis methods //@{ /// Book histograms and initialise projections before the run void init() { // Initialise and register projections declare(Beam(), "Beams"); declare(UnstableParticles(), "UFS"); // Book histograms book(_h_rho , 2, 1, 1); book(_h_kstar, 3, 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; MSG_DEBUG("Avg beam momentum = " << meanBeamMom); for (const Particle& p : apply(event, "UFS"). particles(Cuts::abspid==323 or Cuts::pid==113)) { double xE = p.E()/meanBeamMom; double modp = p.p3().mod(); double beta = modp/p.E(); if(p.pid()==113) { _h_rho->fill(xE,1./beta); } else { _h_kstar->fill(xE,1./beta); } } } /// Normalise histograms etc., after the run void finalize() { scale(_h_rho , sqr(sqrtS())*crossSection()/nanobarn/sumOfWeights()); scale(_h_kstar, sqr(sqrtS())*crossSection()/nanobarn/sumOfWeights()); } //@} /// @name Histograms //@{ Histo1DPtr _h_rho, _h_kstar; //@} }; // The hook for the plugin system DECLARE_RIVET_PLUGIN(JADE_1984_I203145); }