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_2016_I1418483 : public Analysis {
11  public:
12
13    /// Constructor
14    RIVET_DEFAULT_ANALYSIS_CTOR(SND_2016_I1418483);
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      double sigma = _numPi0Gamma->val();
47      double error = _numPi0Gamma->err();
48      sigma *= crossSection()/ sumOfWeights() /nanobarn;
49      error *= crossSection()/ sumOfWeights() /nanobarn;
50      Scatter2D temphisto(refData(1, 1, 5));
51      Scatter2DPtr mult;
52      book(mult, 1, 1, 5);
53      for (size_t b = 0; b < temphisto.numPoints(); b++) {
54	const double x  = temphisto.point(b).x();
55	pair<double,double> ex = temphisto.point(b).xErrs();
56	pair<double,double> ex2 = ex;
57	if(ex2.first ==0.) ex2. first=0.0001;
58	if(ex2.second==0.) ex2.second=0.0001;
59	if (inRange(sqrtS()/MeV, x-ex2.first, x+ex2.second)) {
60	  mult->addPoint(x, sigma, ex, make_pair(error,error));
61	}
62	else {
63	  mult->addPoint(x, 0., ex, make_pair(0.,.0));
64	}
65      }
66    }
67
68    //@}
69
70
71    /// @name Histograms
72    //@{
73    CounterPtr _numPi0Gamma;
74    //@}
75
76
77  };
78
79
80  // The hook for the plugin system
81  RIVET_DECLARE_PLUGIN(SND_2016_I1418483);
82
83
84}