1// -*- C++ -*-
 2#include "Rivet/Analysis.hh"
 3#include "Rivet/Projections/GammaGammaFinalState.hh"
 4#include "Rivet/Projections/FastJets.hh"
 5
 6namespace Rivet {
 7
 8
 9  /// @brief Jet production in photon-photon collisions at 206 GeV
10  class OPAL_2008_I754316 : public Analysis {
11  public:
12
13    /// Constructor
14    RIVET_DEFAULT_ANALYSIS_CTOR(OPAL_2008_I754316);
15
16
17    /// @name Analysis methods
18    //@{
19
20    /// Book histograms and initialise projections before the run
21    void init() {
22      // get the hadronic final state
23      const GammaGammaKinematics& gammakin = declare(GammaGammaKinematics(), "Kinematics");
24      const FinalState & fs = declare(GammaGammaFinalState(gammakin), "FS");
25      declare(FastJets(fs, FastJets::KT,1.),"Jets");
26
27      // Book histograms
28      book(_h_y1,1, 1, 1);
29      book(_h_y2,2, 1, 1);
30
31    }
32
33
34    /// Perform the per-event analysis
35    void analyze(const Event& event) {
36      Jets jets = apply<FastJets>(event, "Jets").jetsByPt(Cuts::pT > 5*GeV and Cuts::abseta < 1.5);
37      if(jets.empty()) vetoEvent;
38      for(const Jet & jet : jets) {
39      	_h_y2->fill(jet.pT());
40      	if(abs(jet.eta())<1.0)
41      	  _h_y1->fill(jet.pT());
42      }
43    }
44
45
46    /// Normalise histograms etc., after the run
47    void finalize() {
48
49      scale(_h_y1, crossSection()/picobarn/sumOfWeights());
50      scale(_h_y2, crossSection()/picobarn/sumOfWeights());
51
52    }
53
54    //@}
55
56
57    /// @name Histograms
58    //@{
59    Histo1DPtr _h_y1, _h_y2;
60    //@}
61
62
63  };
64
65
66  // The hook for the plugin system
67  RIVET_DECLARE_PLUGIN(OPAL_2008_I754316);
68
69
70}