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## Rivet analyses reference

### L3_1991_I314407

$\pi^0$ and charged particle spectra at 91 GeV
Experiment: L3 (LEP)
Inspire ID: 314407
Status: VALIDATED
Authors:
• Peter Richardson
References:
• Phys.Lett.B 259 (1991) 199-208
Beams: e+ e-
Beam energies: (45.6, 45.6) GeV
Run details:
Measurement of the momentum distribution of the $\pi^0$ mesons and charged particles at 91.2 GeV in $e^+e^-$ collisions by the L3 collaboration.
  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 // -*- C++ -*- #include "Rivet/Analysis.hh" #include "Rivet/Projections/ChargedFinalState.hh" #include "Rivet/Projections/UnstableParticles.hh" namespace Rivet { /// @brief pi0 and charged particle spectra class L3_1991_I314407 : public Analysis { public: /// Constructor DEFAULT_RIVET_ANALYSIS_CTOR(L3_1991_I314407); /// @name Analysis methods ///@{ /// Book histograms and initialise projections before the run void init() { // projections declare(ChargedFinalState(), "FS"); declare(UnstableParticles(), "UFS"); // book histos book(_h_pi0_x ,3,1,1); book(_h_pi0_xi ,4,1,1); book(_h_charged_x ,5,1,1); book(_h_charged_xi,6,1,1); } /// Perform the per-event analysis void analyze(const Event& event) { const FinalState& fs = apply(event, "FS"); for (const Particle& p : fs.particles()) { const double x = 2.*p.momentum().p3().mod()/sqrtS(); _h_charged_x ->fill(x); _h_charged_xi->fill(-log(x)); } const UnstableParticles& ufs = apply(event, "UFS"); for (const Particle & p : ufs.particles(Cuts::pid==PID::PI0)) { const double x = 2.*p.momentum().p3().mod()/sqrtS(); _h_pi0_x ->fill(x); _h_pi0_xi->fill(-log(x)); } } /// Normalise histograms etc., after the run void finalize() { scale(_h_pi0_x , 1./sumOfWeights()); scale(_h_pi0_xi , 1./sumOfWeights()); scale(_h_charged_x , 1./sumOfWeights()); scale(_h_charged_xi, 1./sumOfWeights()); } ///@} /// @name Histograms ///@{ Histo1DPtr _h_pi0_x,_h_pi0_xi,_h_charged_x,_h_charged_xi; ///@} }; DECLARE_RIVET_PLUGIN(L3_1991_I314407); }