Rivet analyses

title: MARKII_1987_I234976

$\Xi^-$ production at 29 GeV

Experiment: MARKII (PEP)

Inspire ID: 234976

Status: VALIDATED

Authors: - Peter Richardson

References: - Phys.Rev.Lett. 58 (1987) 644, 1987

Beams: e+ e-

Beam energies: (14.5, 14.5)GeV

Run details: - e+ e- to hadrons at 29 GeV

Rate and spectrum for $\Omega^-$ baryon production at 29 GeV measured by the MARKII collaboration.

Source code:MARKII_1987_I234976.cc

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

include "Rivet/Analysis.hh"

include "Rivet/Projections/UnstableParticles.hh"

namespace Rivet {

/// @brief Xi- production at 29 GeV class MARKII_1987_I234976 : public Analysis { public:

/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(MARKII_1987_I234976);


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

/// Book histograms and initialise projections before the run
void init() {
  // Initialise and register projections
  declare(UnstableParticles(), "UFS");
  //Histograms
  book(_h_spect, 1, 1, 1);
  book(_h_sigma, 2, 1, 1);
  book(_h_rate, 2, 1, 2);
}


/// Perform the per-event analysis
void analyze(const Event& event) {
  const UnstableParticles& ufs = apply<UnstableParticles>(event, "UFS");
  for (const Particle& p : ufs.particles(Cuts::abspid == 3312)) {
    const double xp = 2. * p.E() / sqrtS();
    const double beta = p.p3().mod() / p.E();
    _h_spect->fill(xp, 1. / beta);
    _h_sigma->fill(29);
    _h_rate->fill(29);
  }
}


/// Normalise histograms etc., after the run
void finalize() {
  scale(_h_spect, sqr(sqrtS()) * crossSection() / nanobarn / sumOfWeights());
  scale(_h_sigma, crossSection() / picobarn / sumOfWeights());
  scale(_h_rate, 1. / sumOfWeights());
}

///@}


/// @name Histograms
///@{
Histo1DPtr _h_spect;
BinnedHistoPtr<int> _h_sigma, _h_rate;
///@}

};

RIVET_DECLARE_PLUGIN(MARKII_1987_I234976);

} ```