Rivet analyses

title: DM1_1982_I176801

Cross section for $e^+e^-\to K^0_SK^\pm\pi^\mp$ for energies from 1.4 to 2.1 GeV

Experiment: DM1 (DCI)

Inspire ID: 176801

Status: VALIDATED

Authors: - Peter Richardson

References: - Z.Phys. C52 (1991) 227-230, 1991

Beams: e+ e-

Beam energies: ANY

Run details: - e+e- to hadrons

Measurement of the cross section for $e^+e^-\to K^0_SK^\pm\pi^\mp$ for energies from 1.4 to 2.`x GeV.

Source code:DM1_1982_I176801.cc

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

include "Rivet/Analysis.hh"

include "Rivet/Projections/FinalState.hh"

namespace Rivet {

/// @brief e+e- -> KS0 K+- pi-+ class DM1_1982_I176801 : public Analysis { public:

/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(DM1_1982_I176801);


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

/// Book histograms and initialise projections before the run
void init() {
  // Initialise and register projections
  declare(FinalState(), "FS");
  book(_nKKpi, "/TMP/nKKpi", refData(1, 1, 1));
}


/// 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 != 3) vetoEvent;
  if (nCount[310] == 1
      && ((nCount[211] == 1 && nCount[-321] == 1) || (nCount[-211] == 1 && nCount[321] == 1)))
    _nKKpi->fill(sqrtS() / MeV);
}


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

/// @}


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

};

RIVET_DECLARE_PLUGIN(DM1_1982_I176801);

} ```