Rivet analyses

Cross section for e+e− → K+K−π+π− between 1.44 and 2.01 GeV

Experiment: CMD3 (VEPP-2M)

Inspire ID: 1395968

Status: VALIDATED

Authors: - Peter Richardson

References: - Phys.Lett. B759 (2016) 634-640, 2016

Beams: e+ e-

Beam energies: ANY

Run details: - e+e- to hadrons

Source code:CMD3_2016_I1395968.cc

// -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/FinalState.hh"

namespace Rivet {


  /// @brief Add a short analysis description here
  class CMD3_2016_I1395968 : public Analysis {
  public:

    /// Constructor
    RIVET_DEFAULT_ANALYSIS_CTOR(CMD3_2016_I1395968);


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

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

      // Initialise and register projections
      declare(FinalState(), "FS");
      book(_cKpKmpippim, "TMP/KpKmpippim", 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 != 4) vetoEvent;
      if (nCount[321] == 1 && nCount[-321] == 1 && nCount[211] == 1 && nCount[-211] == 1)
        _cKpKmpippim->fill(sqrtS() / MeV);
    }


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

    /// @}


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


  RIVET_DECLARE_PLUGIN(CMD3_2016_I1395968);


}