Rivet analyses

title: CLEOII_1999_I478217

Spectra for $\Xi_c^{\prime}$ at 10.58 GeV

Experiment: CLEOII (CESR)

Inspire ID: 478217

Status: VALIDATED

Authors: - Peter Richardson

References: - Phys.Rev.Lett. 82 (1999) 492-496

Beams: e+ e-

Beam energies: (5.3, 5.3)GeV

Run details: - e+e- to hadrons

Spectrum for the average of $\Xi_c^{\prime0}$ and $\Xi_c^{\prime+}$ produced at 10.58 GeV measured by CLEOII.

Source code:CLEOII_1999_I478217.cc

```c++ // -- C++ --

include "Rivet/Analysis.hh"

include "Rivet/Projections/Beam.hh"

include "Rivet/Projections/UnstableParticles.hh"

namespace Rivet {

/// @brief Xi_c' spectrum class CLEOII_1999_I478217 : public Analysis { public:

/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(CLEOII_1999_I478217);


/// @name Analysis methods
/// @{

/// Book histograms and initialise projections before the run
void init() {
  // projections
  declare(Beam(), "Beams");
  declare(UnstableParticles(), "UFS");
  // book histos
  book(_h_Xi_c, 1, 1, 1);
  _axis = YODA::Axis<double>(5, 0.5, 1.0);
}


/// Perform the per-event analysis
void analyze(const Event& event) {
  if (_edges.empty()) _edges = _h_Xi_c->xEdges();
  // 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(2.578));
  const UnstableParticles& ufs = apply<UnstableParticles>(event, "UFS");
  for (const Particle& p : ufs.particles(Cuts::abspid == 4312 or Cuts::abspid == 4322)) {
    double xp = p.momentum().p3().mod() / Pmax;
    _h_Xi_c->fill(map2string(xp));
  }
}

string map2string(const double value) const {
  const size_t idx = _axis.index(value);
  if (idx && idx <= _edges.size()) return _edges[idx - 1];
  return "OTHER";
}


/// Normalise histograms etc., after the run
void finalize() {
  normalize(_h_Xi_c);
  // bin width (0.1)
  scale(_h_Xi_c, 10.);
}

/// @}


/// @name Histograms
/// @{
BinnedHistoPtr<string> _h_Xi_c;
YODA::Axis<double> _axis;
vector<string> _edges;
/// @}

};

RIVET_DECLARE_PLUGIN(CLEOII_1999_I478217);

} ```