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: (0.5, 0.5); (0.5, 0.5); (0.5, 0.5); (0.5, 0.5); (0.5, 0.5); (0.6, 0.6); (0.6, 0.6); (0.6, 0.6); (0.6, 0.6); (0.6, 0.6); (0.6, 0.6); (0.6, 0.6); (0.6, 0.6); (0.6, 0.6); (0.6, 0.6); (0.6, 0.6); (0.6, 0.6); (0.6, 0.6); (0.6, 0.6); (0.6, 0.6); (0.7, 0.7); (0.7, 0.7) GeV Run details:
Measurement of the cross section for $e^+e^-\to K^0_SK^0_L$ at energies between 1.05 and 1.38 GeV.. Beam energy must be specified as analysis option "ENERGY" when rivet-merging samples. 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 e+e- > KS0 KL0
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, 1, 1, 1);
24
25 for (const string& en : _nK0K0.binning().edges<0>()) {
26 double end = std::stod(en)*GeV;
27 if(isCompatibleWithSqrtS(end)) {
28 _ecms = en;
29 break;
30 }
31 }
32 if(_ecms.empty()) MSG_ERROR("Beam energy incompatible with analysis.");
33 }
34
35
36 /// Perform the per-event analysis
37 void analyze(const Event& event) {
38
39 const FinalState& fs = apply<FinalState>(event, "FS");
40
41 map<long,int> nCount;
42 int ntotal(0);
43 for (const Particle& p : fs.particles()) {
44 nCount[p.pid()] += 1;
45 ++ntotal;
46 }
47 if(ntotal==2 &&
48 nCount[130]==1 && nCount[310]==1)
49 _nK0K0->fill(_ecms);
50
51 }
52
53
54 /// Normalise histograms etc., after the run
55 void finalize() {
56 scale(_nK0K0, crossSection()/ sumOfWeights() /nanobarn);
57 }
58
59 /// @}
60
61
62 /// @name Histograms
63 /// @{
64 BinnedHistoPtr<string> _nK0K0;
65 string _ecms;
66 /// @}
67
68
69 };
70
71
72 RIVET_DECLARE_PLUGIN(CMD2_2003_I601222);
73
74
75}
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