Rivet analyses

title: 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: - e+e- to hadrons

Measurement for the scaled momentum spectrum for $\Lambda_c^+$ baryons in the continuum by CLEO.

Source code:CLEO_1990_I298611.cc

```c++ // -- 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
RIVET_DEFAULT_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<Beam>(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<UnstableParticles>(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<Histo1DPtr> _h_x;
/// @}

};

RIVET_DECLARE_PLUGIN(CLEO_1990_I298611);

} ```