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## Rivet analyses reference

Spectra for anti-protons and $\bar{\Lambda}^0$ at 34 GeV
Inspire ID: 166363
Status: VALIDATED
Authors:
• Peter Richardson
References:
• Phys.Lett. 104B (1981) 325-329
Beams: e+ e-
Beam energies: (17.0, 17.0) GeV
Run details:
Measurement of the anti-proton and $\bar{\Lambda}^0$ momentum spectrum in $e^+e^-$ collisions for a centre-of-mass energy of 34 GeV by the JADE experiment at Petra. Useful as not summed over particle and antiparticle, only the antibaryons are included.
  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 // -*- C++ -*- #include "Rivet/Analysis.hh" #include "Rivet/Projections/FinalState.hh" #include "Rivet/Projections/UnstableParticles.hh" namespace Rivet { /// @brief pbar and lambdabar at 34 GeV class JADE_1981_I166363 : public Analysis { public: /// Constructor DEFAULT_RIVET_ANALYSIS_CTOR(JADE_1981_I166363); /// @name Analysis methods //@{ /// Book histograms and initialise projections before the run void init() { // Initialise and register projections declare(FinalState(), "FS"); declare(UnstableParticles(), "UFS"); // Book histograms book(_h_pbar , 1, 1, 1); book(_h_lambdabar, 2, 1, 1); } /// Perform the per-event analysis void analyze(const Event& event) { // at least 5 charged FS particles const FinalState& fs = apply(event, "FS"); const size_t numParticles = fs.particles().size(); if (numParticles < 3) { MSG_DEBUG("Failed leptonic event cut"); vetoEvent; } MSG_DEBUG("Passed leptonic event cut"); for (const Particle& p : apply(event, "UFS").particles(Cuts::pid==-2212 or Cuts::pid==-3122)) { if(p.pid()==-2212) _h_pbar->fill(p.p3().mod()); else _h_lambdabar->fill(p.p3().mod()); } } /// Normalise histograms etc., after the run void finalize() { scale(_h_pbar , crossSection()/nanobarn/sumOfWeights()); scale(_h_lambdabar, crossSection()/nanobarn/sumOfWeights()); } //@} /// @name Histograms //@{ Histo1DPtr _h_pbar, _h_lambdabar; //@} }; // The hook for the plugin system DECLARE_RIVET_PLUGIN(JADE_1981_I166363); }