rivet is hosted by Hepforge, IPPP Durham

## Rivet analyses reference

### L3_1997_I427107

$\eta^\prime$ and $\omega$ specta at 91 GeV
Experiment: L3 (LEP)
Inspire ID: 427107
Status: VALIDATED
Authors:
• Peter Richardson
References:
• Phys.Lett. B393 (1997) 465-476, 1997
Beams: e- e+
Beam energies: (45.6, 45.6) GeV
Run details:
• e+ e- to hadrons at the Z pole

Measurement of the momentum distribution of the $\eta^\prime$ and $\omega$ mesons at 91.2 GeV in $e^+e^-$ collisions.

Source code: L3_1997_I427107.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 94 95 96 97 98 99 100 101 102 103 104 105 106 // -*- C++ -*- #include "Rivet/Analysis.hh" #include "Rivet/Projections/Beam.hh" #include "Rivet/Projections/ChargedFinalState.hh" #include "Rivet/Projections/UnstableParticles.hh" namespace Rivet { /// @brief eta' and omega production at mz class L3_1997_I427107 : public Analysis { public: /// Constructor DEFAULT_RIVET_ANALYSIS_CTOR(L3_1997_I427107); /// @name Analysis methods //@{ /// Book histograms and initialise projections before the run void init() { // Initialise and register projections declare(Beam(), "Beams"); declare(ChargedFinalState(), "FS"); declare(UnstableParticles(), "UFS"); // // Book histograms book(_histXpOmega , 5, 1, 1); book(_histLnXpOmega, 6, 1, 1); book(_histXpEtaP1 , 7, 1, 1); book(_histLnXpEtaP1, 8, 1, 1); book(_histXpEtaP2 , 9, 1, 1); book(_histLnXpEtaP2, 10, 1, 1); } /// Perform the per-event analysis void analyze(const Event& event) { // Even if we only generate hadronic events, we still need a cut on numCharged >= 2. const FinalState& fs = apply(event, "FS"); if (fs.particles().size() < 2) { MSG_DEBUG("Failed ncharged cut"); vetoEvent; } MSG_DEBUG("Passed ncharged 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 Particles& mesons = apply(event, "UFS").particles(Cuts::pid==PID::ETAPRIME or Cuts::pid==PID::OMEGA); for (const Particle& p : mesons) { double xp = p.p3().mod()/meanBeamMom; double xi = log(1./xp); if(p.pid()==PID::ETAPRIME) { _histXpEtaP1->fill(xp); _histLnXpEtaP1->fill(xi); _histXpEtaP2->fill(xp); _histLnXpEtaP2->fill(xi); } else { _histXpOmega->fill(xp); _histLnXpOmega->fill(xi); } } } /// Normalise histograms etc., after the run void finalize() { scale(_histXpEtaP1 , 1./sumOfWeights()); scale(_histLnXpEtaP1, 1./sumOfWeights()); scale(_histXpEtaP2 , 1./sumOfWeights()); scale(_histLnXpEtaP2, 1./sumOfWeights()); scale(_histXpOmega , 1./sumOfWeights()); scale(_histLnXpOmega, 1./sumOfWeights()); } //@} /// @name Histograms //@{ Histo1DPtr _histXpEtaP1,_histXpEtaP2; Histo1DPtr _histLnXpEtaP1,_histLnXpEtaP2; Histo1DPtr _histXpOmega; Histo1DPtr _histLnXpOmega; //@} }; // The hook for the plugin system DECLARE_RIVET_PLUGIN(L3_1997_I427107); }