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 CMD2_2003_I601222 : public Analysis {
10  public:
11
12    /// Constructor
13    RIVET_DEFAULT_ANALYSIS_CTOR(CMD2_2003_I601222);
14
15
16    /// @name Analysis methods
17    //@{
18
19    /// Book histograms and initialise projections before the run
20    void init() {
21      
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      Scatter2D temphisto(refData(1, 1, 1));
54      Scatter2DPtr mult;
55      book(mult, 1, 1, 1);
56      for (size_t b = 0; b < temphisto.numPoints(); b++) {
57	const double x  = temphisto.point(b).x();
58	pair<double,double> ex = temphisto.point(b).xErrs();
59	pair<double,double> ex2 = ex;
60	if(ex2.first ==0.) ex2. first=0.0001;
61	if(ex2.second==0.) ex2.second=0.0001;
62	if (inRange(sqrtS()/GeV, x-ex2.first, x+ex2.second)) {
63	  mult->addPoint(x, sigma, ex, make_pair(error,error));
64	}
65	else {
66	  mult->addPoint(x, 0., ex, make_pair(0.,.0));
67	}
68      }
69    }
70
71    //@}
72
73
74    /// @name Histograms
75    //@{
76    CounterPtr _nK0K0;
77    //@}
78
79
80  };
81
82
83  // The hook for the plugin system
84  RIVET_DECLARE_PLUGIN(CMD2_2003_I601222);
85
86
87}