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 CMD_1985_I221309 : public Analysis {
11  public:
12
13    /// Constructor
14    RIVET_DEFAULT_ANALYSIS_CTOR(CMD_1985_I221309);
15
16
17    /// @name Analysis methods
18    //@{
19
20    /// Book histograms and initialise projections before the run
21    void init() {
22
23      // Initialise and register projections
24      declare(FinalState(), "FS");
25
26      // Book histograms
27      book(_npion, "TMP/pion");
28    }
29
30
31    /// Perform the per-event analysis
32    void analyze(const Event& event) {
33      const FinalState& fs = apply<FinalState>(event, "FS");
34      if(fs.particles().size()!=2) vetoEvent;
35      for (const Particle& p : fs.particles()) {
36	if(abs(p.pid())!=PID::PIPLUS) vetoEvent;
37      }
38      _npion->fill();
39    }
40
41
42    /// Normalise histograms etc., after the run
43    void finalize() {
44      double sigma = _npion->val();
45      double error = _npion->err();
46      sigma *= crossSection()/ sumOfWeights() /nanobarn;
47      error *= crossSection()/ sumOfWeights() /nanobarn;
48      for(unsigned int ix=1;ix<3;++ix) {
49	Scatter2D temphisto(refData(ix, 1, 1));
50	Scatter2DPtr mult;
51	book(mult, ix, 1, 1);
52	for (size_t b = 0; b < temphisto.numPoints(); b++) {
53	  const double x  = temphisto.point(b).x();
54	  pair<double,double> ex = temphisto.point(b).xErrs();
55	  pair<double,double> ex2 = ex;
56	  if(ex2.first ==0.) ex2. first=0.0001;
57	  if(ex2.second==0.) ex2.second=0.0001;
58	  if (inRange(sqrtS()/MeV, x-ex2.first, x+ex2.second)) {
59	    mult->addPoint(x, sigma, ex, make_pair(error,error));
60	  }
61	  else {
62	    mult->addPoint(x, 0., ex, make_pair(0.,.0));
63	  }
64	}
65      }
66    }
67
68    //@}
69
70
71    /// @name Histograms
72    //@{
73    CounterPtr _npion;
74    //@}
75
76
77  };
78
79
80  // The hook for the plugin system
81  RIVET_DECLARE_PLUGIN(CMD_1985_I221309);
82
83
84}