Rivet analyses

Cross section for e⁺e⁻ → π⁺π⁺π⁻π⁺ between 1.4 and 2.18 GeV

Experiment: DM1 (DCI)

Inspire ID: 168552

Status: VALIDATED

Authors: - Peter Richardson

References: - Phys.Lett. B109 (1982) 129-132, 1982

Beams: e+ e-

Beam energies: (0.7, 0.7); (0.7, 0.7); (0.7, 0.7); (0.7, 0.7); (0.7, 0.7); (0.8, 0.8); (0.8, 0.8); (0.8, 0.8); (0.8, 0.8); (0.8, 0.8); (0.8, 0.8); (0.8, 0.8); (0.8, 0.8); (0.8, 0.8); (0.8, 0.8); (0.9, 0.9); (0.9, 0.9); (0.9, 0.9); (0.9, 0.9); (0.9, 0.9); (0.9, 0.9); (0.9, 0.9); (0.9, 0.9); (0.9, 0.9); (0.9, 0.9); (1.0, 1.0); (1.0, 1.0); (1.0, 1.0); (1.0, 1.0); (1.0, 1.0); (1.0, 1.0); (1.0, 1.0); (1.0, 1.0); (1.1, 1.1); (1.1, 1.1); (1.1, 1.1); (1.1, 1.1)GeV

Run details: - e+e- to hadrons

Measurement of the cross section for e⁺e⁻ → π⁺π⁺π⁻π⁺ between 1.4 and 2.18 GeV.

Source code:`DM1_1982_I168552.cc`

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

namespace Rivet {


  /// @brief e+ e- -> 2pi+ 2pi-
  class DM1_1982_I168552 : public Analysis {
  public:

    /// Constructor
    RIVET_DEFAULT_ANALYSIS_CTOR(DM1_1982_I168552);


    /// @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);
      for (const string& en : _npion.binning().edges<0>()) {
        double eval = stod(en)*GeV;
        if (isCompatibleWithSqrtS(eval)) {
          _sqs = en; break;
        }
      }
      raiseBeamErrorIf(_sqs.empty());
    }


    /// 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 (p.abspid() != PID::PIPLUS) vetoEvent;
      }
      _npion->fill(_sqs);
    }


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

    /// @}


    /// @name Histograms
    /// @{
    BinnedHistoPtr<string> _npion;
    string _sqs = "";
    /// @}


  };


  RIVET_DECLARE_PLUGIN(DM1_1982_I168552);
}

Rivet analyses

Cross section for e+e− → π+π+π−π+ between 1.4 and 2.18 GeV

Source code:DM1_1982_I168552.cc

Cross section for e⁺e⁻ → π⁺π⁺π⁻π⁺ between 1.4 and 2.18 GeV

Source code:`DM1_1982_I168552.cc`