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 SND_2003_I612867 : public Analysis {
11  public:
12
13    /// Constructor
14    RIVET_DEFAULT_ANALYSIS_CTOR(SND_2003_I612867);
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(_numPi0Gamma, "TMP/Pi0Gamma");
24    }
25
26
27    /// Perform the per-event analysis
28    void analyze(const Event& event) {
29
30      const FinalState& fs = apply<FinalState>(event, "FS");
31
32      map<long,int> nCount;
33      int ntotal(0);
34      for (const Particle& p : fs.particles()) {
35	nCount[p.pid()] += 1;
36	++ntotal;
37      }
38      if(ntotal==2 && nCount[22]==1 && nCount[111]==1)
39	_numPi0Gamma->fill();
40
41    }
42
43
44    /// Normalise histograms etc., after the run
45    void finalize() {
46
47      double sigma = _numPi0Gamma->val();
48      double error = _numPi0Gamma->err();
49      sigma *= crossSection()/ sumOfWeights() /nanobarn;
50      error *= crossSection()/ sumOfWeights() /nanobarn;
51      Estimate1DPtr mult;
52      book(mult, 1, 1, 1);
53      for (auto& b : mult->bins()) {
54        if (inRange(sqrtS()/MeV, b.xMin(), b.xMax())) {
55          b.set(sigma, error);
56        }
57      }
58    }
59
60    /// @}
61
62
63    /// @name Histograms
64    /// @{
65    CounterPtr _numPi0Gamma;
66    /// @}
67
68
69  };
70
71
72  RIVET_DECLARE_PLUGIN(SND_2003_I612867);
73
74
75}