Rivet analyses

Cross section for e⁺e⁻ → π⁺π⁺π⁻π⁺ between 0.98 and 1.38 GeV

Experiment: CMD2 (VEPP-2M)

Inspire ID: 648023

Status: VALIDATED

Authors: - Peter Richardson

References: - Phys.Lett. B595 (2004) 101-108, 2004

Beams: e+ e-

Beam energies: (0.5, 0.5); (0.5, 0.5); (0.5, 0.5); (0.5, 0.5); (0.5, 0.5); (0.5, 0.5); (0.5, 0.5); (0.6, 0.6); (0.6, 0.6); (0.6, 0.6); (0.6, 0.6); (0.6, 0.6); (0.6, 0.6); (0.6, 0.6); (0.6, 0.6); (0.6, 0.6); (0.6, 0.6); (0.6, 0.6); (0.6, 0.6); (0.6, 0.6); (0.6, 0.6); (0.6, 0.6); (0.6, 0.6); (0.6, 0.6); (0.6, 0.6); (0.6, 0.6); (0.6, 0.6); (0.7, 0.7); (0.7, 0.7); (0.7, 0.7); (0.7, 0.7); (0.7, 0.7); (0.7, 0.7); (0.7, 0.7); (0.7, 0.7); (0.7, 0.7)GeV

Run details: - e+e- to hadrons

Measurement of the cross section for e⁺e⁻ → π⁺π⁺π⁻π⁺ between 0.98 and 1.38 GeV.

Source code:`CMD2_2004_I648023.cc`

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

namespace Rivet {


  /// @brief Add a short analysis description here
  class CMD2_2004_I648023 : public Analysis {
  public:

    /// Constructor
    RIVET_DEFAULT_ANALYSIS_CTOR(CMD2_2004_I648023);


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

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

      // Initialise and register projections
      declare(FinalState(), "FS");

      // Book histograms
      book(_npion, 1, 1, 1);

    }


    /// Perform the per-event analysis
    void analyze(const Event& event) {
      const FinalState& fs = apply<FinalState>(event, "FS");
      if(fs.particles().size()!=4) vetoEvent;
      for (const Particle& p : fs.particles()) {
    if(abs(p.pid())!=PID::PIPLUS) vetoEvent;
      }
      _npion->fill(round(sqrtS()/MeV));
    }


    /// Normalise histograms etc., after the run
    void finalize() {
      scale(_npion, crossSection()/ sumOfWeights() /nanobarn);
    }

    /// @}


    /// @name Histograms
    /// @{
    BinnedHistoPtr<int> _npion;
    /// @}


  };


  RIVET_DECLARE_PLUGIN(CMD2_2004_I648023);


}

Rivet analyses

Cross section for e+e− → π+π+π−π+ between 0.98 and 1.38 GeV

Source code:CMD2_2004_I648023.cc

Cross section for e⁺e⁻ → π⁺π⁺π⁻π⁺ between 0.98 and 1.38 GeV

Source code:`CMD2_2004_I648023.cc`