Rivet analyses

Jet production in Photon-Photon collisions at ECMS = 198 GeV

Experiment: L3 (LEP)

Inspire ID: 661114

Status: VALIDATED

Authors: - Peter Richardson

References: - Phys.Lett. B602 (2004) 157-166, 2004

Beams: e+ e-

Beam energies: (99.0, 99.0)GeV

Run details: - e+ e- > gamma gamma events, needs direct, resolved and double resolved.

Jet production in γγ collisions where the photons are radiation from incoming electrons and positrons

Source code:L3_2004_I661114.cc

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

namespace Rivet {


  /// @brief Jet production in photon-photon collisions at 198 GeV
  class L3_2004_I661114 : public Analysis {
  public:

    /// Constructor
    RIVET_DEFAULT_ANALYSIS_CTOR(L3_2004_I661114);


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

    /// Book histograms and initialise projections before the run
    void init() {
      // get the hadronic final state
      const FinalState & fs = declare(GammaGammaFinalState(), "FS");
      declare(FastJets(fs, JetAlg::KT,1.),"Jets");

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

    }


    /// Perform the per-event analysis
    void analyze(const Event& event) {
      Jets jets = apply<FastJets>(event, "Jets").jetsByPt(Cuts::pT > 3*GeV and Cuts::abseta < 1.0);
      if(jets.empty()) vetoEvent;
      for(const Jet & jet : jets) {
        _h_y->fill(jet.pT());
      }
    }


    /// Normalise histograms etc., after the run
    void finalize() {

      scale(_h_y, crossSection()/picobarn/sumOfWeights());

    }

    /// @}


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


  };


  RIVET_DECLARE_PLUGIN(L3_2004_I661114);


}