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## Rivet analyses reference

### DELPHI_2000_I524694

$\Sigma^-$ and $\Lambda(1520)$ production at the $Z^0$ pole from DELPHI
Experiment: DELPHI (LEP)
Inspire ID: 524694
Status: VALIDATED
Authors:
• Peter Richardson
References:
• Phys.Lett. B475 (2000) 429-447, 2000
Beams: e+ e-
Beam energies: (45.6, 45.6) GeV
Run details:
• Hadronic Z decay events generated on the Z pole ($\sqrt{s} = 91.2$ GeV)

Measurement of the $\Sigma^-$ and $\Lambda^0(1520)$ scaled momentum distributions by DELPHI at LEP 1

Source code: DELPHI_2000_I524694.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 // -*- C++ -*- #include "Rivet/Analysis.hh" #include "Rivet/Projections/UnstableParticles.hh" #include "Rivet/Projections/Beam.hh" namespace Rivet { /// @brief Add a short analysis description here class DELPHI_2000_I524694 : public Analysis { public: /// Constructor DEFAULT_RIVET_ANALYSIS_CTOR(DELPHI_2000_I524694); /// @name Analysis methods //@{ /// Book histograms and initialise projections before the run void init() { declare(Beam(), "Beams"); declare(UnstableParticles(), "UFS"); book(_histXpSigma, 1, 1, 1); book(_histXpLambda, 3, 1, 1); } /// Perform the per-event analysis void analyze(const Event& event) { // Get event weight for histo filling // 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 UnstableParticles& ufs = apply(event, "UFS"); for (const Particle& p : ufs.particles()) { const int id = p.abspid(); double xp = p.p3().mod()/meanBeamMom; switch (id) { case 3112: _histXpSigma->fill(xp); break; case 3124: _histXpLambda->fill(xp); break; } } } /// Normalise histograms etc., after the run void finalize() { double fact = 1./sumOfWeights(); scale(_histXpSigma , fact); scale(_histXpLambda, fact); } //@} /// @name Histograms //@{ Histo1DPtr _histXpSigma; Histo1DPtr _histXpLambda; //@} }; // The hook for the plugin system DECLARE_RIVET_PLUGIN(DELPHI_2000_I524694); }