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## Rivet analyses reference

### DELPHI_1995_I394052

$K^\pm$ and $p,\bar{p}$ spectra in hadronic $Z^0$ decays
Experiment: DELPHI (LEP)
Inspire ID: 394052
Status: VALIDATED
Authors:
• Peter Richardson
References:
• Nucl.Phys. B444 (1995) 3-26, 1995
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)

DELPHI results for the spectra for $K^\pm$ and $p,\bar{p}$ production in hadronic $Z^0$ decays.

Source code: DELPHI_1995_I394052.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/FinalState.hh" #include "Rivet/Projections/ChargedFinalState.hh" #include "Rivet/Projections/Beam.hh" namespace Rivet { /// @brief K+/- and protno spectra class DELPHI_1995_I394052 : public Analysis { public: /// Constructor DEFAULT_RIVET_ANALYSIS_CTOR(DELPHI_1995_I394052); /// @name Analysis methods //@{ /// Book histograms and initialise projections before the run void init() { declare(Beam(), "Beams"); declare(ChargedFinalState(), "FS"); // Book histograms book(_h_kaon_p , 3, 1, 1); book(_h_kaon_x , 5, 1, 1); book(_h_proton_p , 4, 1, 1); book(_h_proton_x , 6, 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); for (const Particle& p : fs.particles(Cuts::abspid==321 or Cuts::abspid==2212)) { double modp = p.p3().mod(); double xp = modp/meanBeamMom; if(abs(p.pid())==321) { _h_kaon_p ->fill(modp); _h_kaon_x ->fill(xp ); } else { _h_proton_p->fill(modp); _h_proton_x->fill(xp ); } } } /// Normalise histograms etc., after the run void finalize() { scale(_h_kaon_p ,1./sumOfWeights()); scale(_h_kaon_x ,1./sumOfWeights()); scale(_h_proton_p,1./sumOfWeights()); scale(_h_proton_x,1./sumOfWeights()); } //@} /// @name Histograms //@{ Histo1DPtr _h_kaon_p, _h_kaon_x, _h_proton_p, _h_proton_x; //@} }; // The hook for the plugin system DECLARE_RIVET_PLUGIN(DELPHI_1995_I394052); }