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CMD3_2016_I1385598

Cross section for $e^+e^-\to p\bar{p}$ between the threshold and 2 GeV
Experiment: CMD3 (VEPP-2M)
Inspire ID: 1385598
Status: VALIDATED
Authors:
  • Peter Richardson
References:
  • Phys.Lett. B759 (2016) 634-640, 2016
Beams: e+ e-
Beam energies: ANY
Run details:
  • e+e- to hadrons

Source code: CMD3_2016_I1385598.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 CMD3_2016_I1385598 : public Analysis {
11  public:
12
13    /// Constructor
14    RIVET_DEFAULT_ANALYSIS_CTOR(CMD3_2016_I1385598);
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(_nproton, "TMP/proton");
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 (p.abspid() != PID::PROTON) vetoEvent;
38      }
39      _nproton->fill();
40    }
41
42
43    /// Normalise histograms etc., after the run
44    void finalize() {
45      scale(_nproton, crossSection()/ sumOfWeights() /nanobarn);
46      BinnedEstimatePtr<string> mult;
47      book(mult, 1, 1, 6);
48      for (auto& b : mult->bins()) {
49        const double sqrts = std::stod(b.xEdge().substr(0, 4));
50        if (isCompatibleWithSqrtS(sqrts*MeV)) {
51          b.set(_nproton->val(), _nproton->err());
52        }
53      }
54    }
55
56    /// @}
57
58
59    /// @name Histograms
60    /// @{
61    CounterPtr _nproton;
62    /// @}
63
64
65  };
66
67
68  RIVET_DECLARE_PLUGIN(CMD3_2016_I1385598);
69
70
71}