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Rivet analyses reference

SND_2006_I720035

Measurement of the cross section for $e^+e^-\to K_S^0K_L^0$ at energies between 1.04 and 1.38 GeV
Experiment: SND (VEPP-2M)
Inspire ID: 720035
Status: VALIDATED
Authors:
  • Peter Richardson
References:
  • J. Exp. Theor. Phys. 103, 720 (2006)
Beams: e+ e-
Beam energies: ANY
Run details:
  • e+e- to hadrons

Source code: SND_2006_I720035.cc
 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_2006_I720035 : public Analysis {
11  public:
12
13    /// Constructor
14    RIVET_DEFAULT_ANALYSIS_CTOR(SND_2006_I720035);
15
16
17    /// @name Analysis methods
18    /// @{
19
20    /// Book histograms and initialise projections before the run
21    void init() {
22
23      declare(FinalState(), "FS");
24      book(_nK0K0, "TMP/K0K0");
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(SND_2006_I720035);
75
76
77}