Rivet analyses

Cross section for e+e− → π+π+π−π+ between 1.456 and 2.15 GeV

Experiment: GAMMAGAMMA (ADONE)

Inspire ID: 153382

Status: VALIDATED

Authors: - Peter Richardson

References: - Phys.Lett. B95 (1980) 139-142, 1980

Beams: e+ e-

Beam energies: ANY

Run details: - e+e- to hadrons

Measurement of the cross section for e+e− → π+π+π−π+ for energies between 1.456 and 2.15 GeV

Source code:GAMMAGAMMA_1980_I153382.cc

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

namespace Rivet {


  /// @brief e+e- > 2pi+2pi-
  class GAMMAGAMMA_1980_I153382 : public Analysis {
  public:

    /// Constructor
    RIVET_DEFAULT_ANALYSIS_CTOR(GAMMAGAMMA_1980_I153382);


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

    /// Book histograms and initialise projections before the run
    void init() {
      // Initialise and register projections
      declare(FinalState(), "FS");
      // Book histograms
      book(_npion, "TMP/pion", refData(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(sqrtS()/GeV);
    }


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

    /// @}


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


  };


  RIVET_DECLARE_PLUGIN(GAMMAGAMMA_1980_I153382);


}