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Rivet analyses reference

CMD2_2003_I601222

Cross section for $e^+e^-\to K^0_SK^0_L$ at energies between 1.05 and 1.38 GeV
Experiment: CMD2 (VEPP-2M)
Inspire ID: 601222
Status: VALIDATED
Authors:
  • Peter Richardson
References:
  • Phys.Lett. B551 (2003) 27-34, 2003
Beams: e+ e-
Beam energies: ANY
Run details:
  • e+e- to hadrons

Source code: CMD2_2003_I601222.cc
 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      Estimate1DPtr mult;
54      book(mult, 1, 1, 1);
55      for (auto& b : mult->bins()) {
56        if (inRange(sqrtS()/GeV, b.xMin(), b.xMax())) {
57          b.set(sigma, error);
58        }
59      }
60    }
61
62    /// @}
63
64
65    /// @name Histograms
66    /// @{
67    CounterPtr _nK0K0;
68    /// @}
69
70
71  };
72
73
74  RIVET_DECLARE_PLUGIN(CMD2_2003_I601222);
75
76
77}