Rivet analyses referenceCMD2_2003_I601222Cross section for $e^+e^-\to K^0_SK^0_L$ at energies between 1.05 and 1.38 GeVExperiment: CMD2 (VEPP-2M) Inspire ID: 601222 Status: VALIDATED Authors:
Beam energies: ANY Run details:
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}
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