Rivet analyses

title: CMD3_2016_I1444990

Cross section for $e^+e^-\to K^0_SK^0_L$ at energies between 1.004 and 1.06 GeV

Experiment: CMD3 (VEPP-2M)

Inspire ID: 1444990

Status: VALIDATED

Authors: - Peter Richardson

References: - Phys.Lett. B760 (2016) 314-319, 2016

Beams: e+ e-

Beam energies: ANY

Run details: - e+e- to hadrons

Source code:CMD3_2016_I1444990.cc

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

include "Rivet/Analysis.hh"

include "Rivet/Projections/FinalState.hh"

namespace Rivet {

/// @brief Add a short analysis description here class CMD3_2016_I1444990 : public Analysis { public:

/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(CMD3_2016_I1444990);


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

/// Book histograms and initialise projections before the run
void init() {

  declare(FinalState(), "FS");
  book(_nK0K0, "TMP/K0K0", refData(1, 1, 6));
}


/// Perform the per-event analysis
void analyze(const Event& event) {

  const FinalState& fs = apply<FinalState>(event, "FS");

  map<long, int> nCount;
  int ntotal(0);
  for (const Particle& p : fs.particles()) {
    nCount[p.pid()] += 1;
    ++ntotal;
  }
  if (ntotal == 2 && nCount[130] == 1 && nCount[310] == 1) _nK0K0->fill(sqrtS() / MeV);
}


/// Normalise histograms etc., after the run
void finalize() {
  scale(_nK0K0, crossSection() / sumOfWeights() / nanobarn);
  Estimate1DPtr tmp;
  book(tmp, 1, 1, 6);
  barchart(_nK0K0, tmp);
}

/// @}


/// @name Histograms
/// @{
Histo1DPtr _nK0K0;
/// @}

};

RIVET_DECLARE_PLUGIN(CMD3_2016_I1444990);

} ```