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_1998_I480170 : public Analysis {
10  public:
11
12    /// Constructor
13    RIVET_DEFAULT_ANALYSIS_CTOR(CMD2_1998_I480170);
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(_num3pi, "TMP/num3");
26    }
27
28
29    /// Perform the per-event analysis
30    void analyze(const Event& event) {
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!=3) vetoEvent;
40      if(nCount[-211]==1&&nCount[211]==1&&nCount[111]==1)
41	_num3pi->fill();
42    }
43
44
45    /// Normalise histograms etc., after the run
46    void finalize() {
47
48      double sigma = _num3pi->val();
49      double error = _num3pi->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()/MeV, b.xMin(), b.xMax())) {
56          b.set(sigma, error);
57        }
58      }
59    }
60
61    /// @}
62
63
64    /// @name Histograms
65    /// @{
66    CounterPtr _num3pi;
67    /// @}
68
69
70  };
71
72
73  RIVET_DECLARE_PLUGIN(CMD2_1998_I480170);
74
75
76}