1// -*- C++ -*-
 2#include "Rivet/Analysis.hh"
 3#include "Rivet/Projections/FinalState.hh"
 4
 5namespace Rivet {
 6
 7
 8  /// @brief e+ e- > K+K-
 9  class SND_2016_I1484677 : public Analysis {
10  public:
11
12    /// Constructor
13    RIVET_DEFAULT_ANALYSIS_CTOR(SND_2016_I1484677);
14
15
16    /// @name Analysis methods
17    /// @{
18
19    /// Book histograms and initialise projections before the run
20    void init() {
21
22      // Initialise and register projections
23      declare(FinalState(), "FS");
24
25      // Book histograms
26      for(unsigned int ix=0;ix<2;++ix) {
27        book(_nkaon[ix], 1+ix, 1, 1);
28        for (const string& en : _nkaon[ix].binning().edges<0>()) {
29          const double end = std::stod(en)*GeV;
30          if (isCompatibleWithSqrtS(end)) {
31            _ecms[ix] = en;
32            break;
33          }
34        }
35      }
36      if (_ecms[0].empty() && _ecms[1].empty())
37        MSG_ERROR("Beam energy incompatible with analysis.");
38    }
39
40
41    /// Perform the per-event analysis
42    void analyze(const Event& event) {
43      const FinalState& fs = apply<FinalState>(event, "FS");
44      if(fs.particles().size()!=2) vetoEvent;
45      for (const Particle& p : fs.particles()) {
46	if(abs(p.pid())!=PID::KPLUS) vetoEvent;
47      }
48      for(unsigned int ix=0;ix<2;++ix) _nkaon[ix]->fill(_ecms[ix]);
49    }
50
51
52    /// Normalise histograms etc., after the run
53    void finalize() {
54      scale(_nkaon, crossSection()/ sumOfWeights() /nanobarn);
55    }
56
57    /// @}
58
59
60    /// @name Histograms
61    /// @{
62    BinnedHistoPtr<string> _nkaon[2];
63    string _ecms[2];
64    /// @}
65
66
67  };
68
69
70  RIVET_DECLARE_PLUGIN(SND_2016_I1484677);
71
72
73}