1// -*- C++ -*-
 2#include "Rivet/Analysis.hh"
 3#include "Rivet/Projections/FinalState.hh"
 4
 5namespace Rivet {
 6
 7
 8  /// @brief Add a short analysis description here
 9  class DM1_1981_I156053 : public Analysis {
10  public:
11
12    /// Constructor
13    RIVET_DEFAULT_ANALYSIS_CTOR(DM1_1981_I156053);
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      book(_nKSKL, "TMP/nKSKL");
27    }
28
29
30    /// Perform the per-event analysis
31    void analyze(const Event& event) {
32      const FinalState& fs = apply<FinalState>(event, "FS");
33
34      map<long,int> nCount;
35      int ntotal(0);
36      for (const Particle& p : fs.particles()) {
37	nCount[p.pid()] += 1;
38	++ntotal;
39      }
40
41      if(ntotal==2 && nCount[130]==1 && nCount[310]==1)
42	_nKSKL->fill();
43    }
44
45
46    /// Normalise histograms etc., after the run
47    void finalize() {
48      double sigma = _nKSKL->val();
49      double error = _nKSKL->err();
50      sigma *= crossSection()/ sumOfWeights() /nanobarn;
51      error *= crossSection()/ sumOfWeights() /nanobarn;
52      Estimate1DPtr mult;
53      book(mult, 1, 1, 1);
54      for (auto& b : mult->bins()) {
55        if (inRange(sqrtS()/GeV, b.xMin(), b.xMax())) {
56          b.set(sigma, error);
57        }
58      }
59    }
60
61    /// @}
62
63
64    /// @name Histograms
65    /// @{
66    CounterPtr _nKSKL;
67    /// @}
68
69
70  };
71
72
73  RIVET_DECLARE_PLUGIN(DM1_1981_I156053);
74
75
76}