Rivet analyses reference

BABAR_2014_I1287920

Cross section for $e^+e^-\to$ $K_S^0K_L^0$ , $K_S^0K_L^0\pi^+\pi^-$ , $K_S^0K_S^0\pi^+\pi^-$ , $K_S^0K_S^0K^+K^-$ between 1.06 and 2.2 GeV
Experiment: BABAR (PEP-II)
Inspire ID: 1287920
Status: VALIDATED
Authors:

Peter Richardson

References:

Phys.Rev. D89 (2014) 092002, 2014

Beams: e+ e-
Beam energies: (0.5, 0.5); (0.6, 0.6); (0.6, 0.6); (0.6, 0.6); (0.6, 0.6); (0.6, 0.6); (0.7, 0.7); (0.7, 0.7); (0.7, 0.7); (0.7, 0.7); (0.7, 0.7); (0.7, 0.7); (0.7, 0.7); (0.8, 0.8); (0.8, 0.8); (0.8, 0.8); (0.8, 0.8); (0.8, 0.8); (0.8, 0.8); (0.8, 0.8); (0.8, 0.8); (0.8, 0.8); (0.8, 0.8); (0.8, 0.8); (0.9, 0.9); (0.9, 0.9); (0.9, 0.9); (0.9, 0.9); (0.9, 0.9); (0.9, 0.9); (0.9, 0.9); (0.9, 0.9); (0.9, 0.9); (0.9, 0.9); (0.9, 0.9); (0.9, 0.9); (1.0, 1.0); (1.0, 1.0); (1.0, 1.0); (1.0, 1.0); (1.0, 1.0); (1.0, 1.0); (1.0, 1.0); (1.0, 1.0); (1.0, 1.0); (1.0, 1.0); (1.0, 1.0); (1.0, 1.0); (1.1, 1.1); (1.1, 1.1); (1.1, 1.1); (1.1, 1.1); (1.1, 1.1); (1.1, 1.1); (1.1, 1.1); (1.1, 1.1); (1.1, 1.1); (1.1, 1.1); (1.1, 1.1); (1.1, 1.1); (1.2, 1.2); (1.2, 1.2); (1.2, 1.2); (1.2, 1.2); (1.2, 1.2); (1.2, 1.2); (1.2, 1.2); (1.2, 1.2); (1.2, 1.2); (1.2, 1.2); (1.3, 1.3); (1.3, 1.3); (1.3, 1.3); (1.3, 1.3); (1.3, 1.3); (1.3, 1.3); (1.3, 1.3); (1.3, 1.3); (1.3, 1.3); (1.3, 1.3); (1.4, 1.4); (1.4, 1.4); (1.4, 1.4); (1.4, 1.4); (1.4, 1.4); (1.4, 1.4); (1.4, 1.4); (1.4, 1.4); (1.4, 1.4); (1.4, 1.4); (1.5, 1.5); (1.5, 1.5); (1.5, 1.5); (1.5, 1.5); (1.5, 1.5); (1.5, 1.5); (1.5, 1.5); (1.5, 1.5); (1.5, 1.5); (1.5, 1.5); (1.6, 1.6); (1.6, 1.6); (1.6, 1.6); (1.6, 1.6); (1.6, 1.6); (1.6, 1.6); (1.6, 1.6); (1.6, 1.6); (1.6, 1.6); (1.6, 1.6); (1.7, 1.7); (1.7, 1.7); (1.7, 1.7); (1.7, 1.7); (1.7, 1.7); (1.7, 1.7); (1.7, 1.7); (1.7, 1.7); (1.7, 1.7); (1.7, 1.7); (1.8, 1.8); (1.8, 1.8); (1.8, 1.8); (1.8, 1.8); (1.8, 1.8); (1.8, 1.8); (1.8, 1.8); (1.8, 1.8); (1.8, 1.8); (1.8, 1.8); (1.9, 1.9); (1.9, 1.9); (1.9, 1.9); (1.9, 1.9); (1.9, 1.9); (1.9, 1.9); (1.9, 1.9); (1.9, 1.9); (1.9, 1.9); (1.9, 1.9); (2.0, 2.0); (2.0, 2.0); (2.0, 2.0); (2.0, 2.0); (2.0, 2.0); (2.0, 2.0); (2.1, 2.1); (2.1, 2.1); (2.2, 2.2); (2.2, 2.2) GeV
Run details:

e+e- to hadrons

Measurement of the cross section for $e^+e^-\to$ $K_S^0K_L^0$ , $K_S^0K_L^0\pi^+\pi^-$ , $K_S^0K_S^0\pi^+\pi^-$ , $K_S^0K_S^0K^+K^-$ via radiative return, including for energies between 1.06 and 2.2 GeV. Beam energy must be specified as analysis option "ENERGY" when rivet-merging samples.

Source code: BABAR_2014_I1287920.cc

 1// -*- C++ -*-
 2#include "Rivet/Analysis.hh"
 3#include "Rivet/Projections/FinalState.hh"
 4
 5
 6namespace Rivet {
 7
 8
 9  /// @brief e+e- > K0K0 (+pions)
10  class BABAR_2014_I1287920 : public Analysis {
11  public:
12
13    /// Constructor
14    RIVET_DEFAULT_ANALYSIS_CTOR(BABAR_2014_I1287920);
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      for(unsigned int ix=0;ix<4;++ix) {
28        book(_sigma[ix], 9+ix, 1, 1);
29        for (const string& en : _sigma[ix].binning().edges<0>()) {
30          const double end = std::stod(en)*GeV;
31          if (isCompatibleWithSqrtS(end)) {
32            _ecms[ix] = en;
33            break;
34          }
35        }
36      }
37      if (_ecms[0].empty() && _ecms[1].empty() && _ecms[2].empty() && _ecms[3].empty())
38        MSG_ERROR("Beam energy incompatible with analysis.");
39    }
40
41
42    /// Perform the per-event analysis
43    void analyze(const Event& event) {
44      const FinalState& fs = apply<FinalState>(event, "FS");
45
46      map<long,int> nCount;
47      int ntotal(0);
48      for (const Particle& p : fs.particles()) {
49	nCount[p.pid()] += 1;
50	++ntotal;
51      }
52
53      if(ntotal==2 && nCount[130]==1 && nCount[310]==1) {
54	if(!_ecms[0].empty()) _sigma[0]->fill(_ecms[0]);
55      }
56      else if( ntotal==4 &&  nCount[130]==1 && nCount[310]==1 && nCount[211]==1 && nCount[-211]==1) {
57	if(!_ecms[1].empty()) _sigma[1]->fill(_ecms[1]);
58      }
59      else if( ntotal==4 && nCount[310]==2 && nCount[211]==1 && nCount[-211]==1 ) {
60	if(!_ecms[2].empty()) _sigma[2]->fill(_ecms[2]);
61      }
62      else if( ntotal==4 && nCount[310]==2 && nCount[321]==1 && nCount[-321]==1) {
63	if(!_ecms[3].empty()) _sigma[3]->fill(_ecms[3]);
64      }
65    }
66
67
68    /// Normalise histograms etc., after the run
69    void finalize() {
70      double fact = crossSection()/ sumOfWeights() /nanobarn;
71      for(unsigned int ix=0;ix<4;++ix)
72        scale(_sigma[ix],fact);
73    }
74
75    /// @}
76
77
78    /// @name Histograms
79    /// @{
80    BinnedHistoPtr<string> _sigma[4];
81    string _ecms[4];
82    /// @}
83
84
85  };
86
87
88  RIVET_DECLARE_PLUGIN(BABAR_2014_I1287920);
89
90
91}