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## Rivet analyses reference

### TASSO_1982_I179022

$\rho^0$ spectrum in $e^+e^-$ collisions at $E_{\text{CMS}}=34$ GeV
Experiment: TASSO (Petra)
Inspire ID: 179022
Status: VALIDATED
Authors:
• Peter Richardson
References:
• Phys.Lett. B117 (1982) 135-140, 1982
Beams: e- e+
Beam energies: ANY
Run details:
Spectrum for $\rho^0$ production measured by the TASSO experiment in $e^+e^-$ collisions at $E_{\text{CMS}}=34$ GeV 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 // -*- C++ -*- #include "Rivet/Analysis.hh" #include "Rivet/Projections/Beam.hh" #include "Rivet/Projections/UnstableParticles.hh" namespace Rivet { /// @brief Add a short analysis description here class TASSO_1982_I179022 : public Analysis { public: /// Constructor DEFAULT_RIVET_ANALYSIS_CTOR(TASSO_1982_I179022); /// @name Analysis methods //@{ /// Book histograms and initialise projections before the run void init() { declare(Beam(), "Beams"); declare(UnstableParticles(), "UFS"); // Book histograms book(_h_rho, 1, 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::pid==113)) { double xE = p.E()/meanBeamMom; double beta = p.p3().mod()/p.E(); _h_rho->fill(xE,1./beta); } } /// Normalise histograms etc., after the run void finalize() { scale(_h_rho, sqr(sqrtS())*crossSection()/microbarn/sumOfWeights()); // norm to cross section } //@} /// @name Histograms //@{ Histo1DPtr _h_rho; //@} }; // The hook for the plugin system DECLARE_RIVET_PLUGIN(TASSO_1982_I179022); }