Rivet analyses referenceBABAR_2013_I1238807Cross section for $e^+e^-\to K^+K^-$ between threshold and 5 GeVExperiment: BABAR (PEP-II) Inspire ID: 1238807 Status: VALIDATED Authors:
Beam energies: ANY Run details:
Measurement of the cross section for $e^+e^-\to K^+K^-$ at energies between threshold and 5 GeV using radiative return Source code: BABAR_2013_I1238807.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 BABAR_2013_I1238807 : public Analysis {
11 public:
12
13 /// Constructor
14 RIVET_DEFAULT_ANALYSIS_CTOR(BABAR_2013_I1238807);
15
16
17 /// @name Analysis methods
18 /// @{
19
20 /// Book histograms and initialise projections before the run
21 void init() {
22
23 // Initialise and register projections
24 declare(FinalState(), "FS");
25
26 // Book histograms
27 book(_nkaon, "TMP/kaon");
28
29 }
30
31
32 /// Perform the per-event analysis
33 void analyze(const Event& event) {
34 const FinalState& fs = apply<FinalState>(event, "FS");
35 if(fs.particles().size()!=2) vetoEvent;
36 for (const Particle& p : fs.particles()) {
37 if(abs(p.pid())!=PID::KPLUS) vetoEvent;
38 }
39 _nkaon->fill();
40
41 }
42
43
44 /// Normalise histograms etc., after the run
45 void finalize() {
46 double sigma = _nkaon->val();
47 double error = _nkaon->err();
48 sigma *= crossSection()/ sumOfWeights() /nanobarn;
49 error *= crossSection()/ sumOfWeights() /nanobarn;
50 Estimate1DPtr mult;
51 book(mult, 1, 1, 1);
52 for (auto& b : mult->bins()) {
53 if (inRange(sqrtS()/GeV, b.xMin(), b.xMax())) {
54 b.set(sigma, error);
55 }
56 }
57 }
58
59 /// @}
60
61
62 /// @name Histograms
63 /// @{
64 CounterPtr _nkaon;
65 /// @}
66
67
68 };
69
70
71 RIVET_DECLARE_PLUGIN(BABAR_2013_I1238807);
72
73
74}
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