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## Rivet analyses reference

### TPC_1984_I205869

$K^{*0}$ and $K^0$ spectra at 29 GeV
Experiment: TPC (PEP)
Inspire ID: 205869
Status: VALIDATED
Authors:
• Peter Richardson
References:
• Phys.Rev.Lett. 53 (1984) 2378, 1984
Beams: e+ e-
Beam energies: (14.5, 14.5) GeV
Run details:
• e+e- to hadrons at 29 GeV

Measurement of the $K^{*0}$ and $K^0$ spectra at 29 GeV by the TPC experiment.

Source code: TPC_1984_I205869.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/Beam.hh" #include "Rivet/Projections/FinalState.hh" #include "Rivet/Projections/ChargedFinalState.hh" #include "Rivet/Projections/UnstableParticles.hh" namespace Rivet { /// @brief K*0 and K0 spectra at 29 GeV class TPC_1984_I205869 : public Analysis { public: /// Constructor DEFAULT_RIVET_ANALYSIS_CTOR(TPC_1984_I205869); /// @name Analysis methods //@{ /// Book histograms and initialise projections before the run void init() { declare(Beam(), "Beams"); declare(ChargedFinalState(), "FS"); declare(UnstableParticles(), "UFS"); book(_histKstar, 3, 1, 1); book(_histK , 4, 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; } MSG_DEBUG("Passed leptonic event cut"); // 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); // Final state of unstable particles to get particle spectra const UnstableParticles& ufs = apply(event, "UFS"); for ( const Particle& p : ufs.particles()) { const int id = p.abspid(); double xE = p.E()/meanBeamMom; switch (id) { case 313: // Photons _histKstar->fill(xE); break; case 130: case 310: _histK->fill(xE); break; } } } /// Normalise histograms etc., after the run void finalize() { scale(_histKstar, 1./sumOfWeights()); scale(_histK , 1./sumOfWeights()); } //@} /// @name Histograms //@{ Histo1DPtr _histKstar; Histo1DPtr _histK ; //@} }; // The hook for the plugin system DECLARE_RIVET_PLUGIN(TPC_1984_I205869); }