1// -*- C++ -*-
 2#include "Rivet/Analysis.hh"
 3#include "Rivet/Projections/FinalState.hh"
 4
 5
 6namespace Rivet {
 7
 8
 9  /// @brief e+e- -> K+K-
10  class DM2_1988_I262690 : public Analysis {
11  public:
12
13    /// Constructor
14    RIVET_DEFAULT_ANALYSIS_CTOR(DM2_1988_I262690);
15
16
17    /// @name Analysis methods
18    /// @{
19
20    /// Book histograms and initialise projections before the run
21    void init() {
22
23      // Initialise and register projections
24      declare(FinalState(), "FS");
25
26      // Book histograms
27      book(_nkaon, "TMP/kaon", refData(1, 1, 1));
28
29    }
30
31
32    /// Perform the per-event analysis
33    void analyze(const Event& event) {
34      const FinalState& fs = apply<FinalState>(event, "FS");
35      if(fs.particles().size()!=2) vetoEvent;
36      for (const Particle& p : fs.particles()) {
37	if(abs(p.pid())!=PID::KPLUS) vetoEvent;
38      }
39      _nkaon->fill(sqrtS()/MeV);
40    }
41
42
43    /// Normalise histograms etc., after the run
44    void finalize() {
45      scale(_nkaon, crossSection()/ sumOfWeights() /nanobarn);
46      Estimate1DPtr mult;
47      book(mult, 1, 1, 1);
48      barchart(_nkaon,mult);
49    }
50
51    /// @}
52
53
54    /// @name Histograms
55    /// @{
56    Histo1DPtr _nkaon;
57    /// @}
58
59
60  };
61
62
63  RIVET_DECLARE_PLUGIN(DM2_1988_I262690);
64
65
66}