1// -*- C++ -*-
 2#include "Rivet/Analysis.hh"
 3#include "Rivet/Projections/FinalState.hh"
 4
 5
 6namespace Rivet {
 7
 8
 9  /// @brief Add a short analysis description here
10  class CMD2_1999_I502164 : public Analysis {
11  public:
12
13    /// Constructor
14    RIVET_DEFAULT_ANALYSIS_CTOR(CMD2_1999_I502164);
15
16
17    /// @name Analysis methods
18    /// @{
19
20    /// Book histograms and initialise projections before the run
21    void init() {
22      declare(FinalState(), "FS");
23      book(_nK0K0, "TMP/K0K0");
24
25    }
26
27
28    /// Perform the per-event analysis
29    void analyze(const Event& event) {
30
31      const FinalState& fs = apply<FinalState>(event, "FS");
32
33      map<long,int> nCount;
34      int ntotal(0);
35      for (const Particle& p : fs.particles()) {
36	nCount[p.pid()] += 1;
37	++ntotal;
38      }
39      if(ntotal==2 &&
40	 nCount[130]==1 && nCount[310]==1)
41	_nK0K0->fill();
42
43    }
44
45
46    /// Normalise histograms etc., after the run
47    void finalize() {
48
49      double sigma = _nK0K0->val();
50      double error = _nK0K0->err();
51      sigma *= crossSection()/ sumOfWeights() /nanobarn;
52      error *= crossSection()/ sumOfWeights() /nanobarn;
53      for (unsigned int ix=1;ix<5;++ix) {
54        Estimate1DPtr mult;
55        book(mult, ix, 1, 1);
56        for (auto& b : mult->bins()) {
57          if (inRange(sqrtS()/MeV, b.xMin(), b.xMax())) {
58            b.set(sigma, error);
59          }
60        }
61      }
62    }
63
64    /// @}
65
66
67    /// @name Histograms
68    /// @{
69    CounterPtr _nK0K0;
70    /// @}
71
72
73  };
74
75
76  RIVET_DECLARE_PLUGIN(CMD2_1999_I502164);
77
78
79}