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## Rivet analyses reference

### CLEO_1990_I298611

Measurement of the $\Lambda_c^+$ spectrum at 10.55 GeV
Experiment: CLEO (CESR)
Inspire ID: 298611
Status: VALIDATED
Authors:
• Peter Richardson
References:
• Phys.Rev. D43 (1991) 3599-3610, 1991
Beams: e+ e-
Beam energies: (5.3, 5.3) GeV
Run details:
Measurement for the scaled momentum spectrum for $\Lambda_c^+$ baryons in the continuum by CLEO.
  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 // -*- C++ -*- #include "Rivet/Analysis.hh" #include "Rivet/Projections/Beam.hh" #include "Rivet/Projections/UnstableParticles.hh" namespace Rivet { /// @brief Lambda_c spectra class CLEO_1990_I298611 : public Analysis { public: /// Constructor DEFAULT_RIVET_ANALYSIS_CTOR(CLEO_1990_I298611); /// @name Analysis methods ///@{ /// Book histograms and initialise projections before the run void init() { // projections declare(Beam(), "Beams"); declare(UnstableParticles(), "UFS"); // histograms for(unsigned int ix=0;ix<6;++ix) { _h_x.push_back(Histo1DPtr()); book(_h_x[ix],ix+1,1,1); } } /// Perform the per-event analysis void analyze(const Event& event) { // Get beams and average beam momentum const ParticlePair& beams = apply(event, "Beams").beams(); const double Emax = ( beams.first.p3().mod() + beams.second.p3().mod() ) / 2.0; const double Pmax = sqrt(sqr(Emax)-sqr(2.28646)); const UnstableParticles& ufs = apply(event, "UFS"); for (const Particle& p : ufs.particles(Cuts::abspid==4122)) { double xp = p.momentum().p3().mod()/Pmax; for(unsigned int ix=0;ix<6;++ix) _h_x[ix]->fill(xp); } } /// Normalise histograms etc., after the run void finalize() { // branching ratios for the different modes used in the measurements double br[6]={0.0623,2.*0.0158,2.*0.0159, 0.0129,0.0361 ,0.0062}; for(unsigned int ix=0;ix<6;++ix) scale(_h_x[ix],crossSection()*br[ix]/picobarn/sumOfWeights()); } ///@} /// @name Histograms ///@{ vector _h_x; ///@} }; DECLARE_RIVET_PLUGIN(CLEO_1990_I298611); }