1// -*- C++ -*-
 2#include "Rivet/Analysis.hh"
 3#include "Rivet/Projections/FinalState.hh"
 4#include "Rivet/Projections/FastJets.hh"
 5
 6namespace Rivet {
 7
 8
 9  /// @brief Add a short analysis description here
10  class DM2_1983_I190558 : public Analysis {
11  public:
12
13    /// Constructor
14    RIVET_DEFAULT_ANALYSIS_CTOR(DM2_1983_I190558);
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    /// Perform the per-event analysis
32    void analyze(const Event& event) {
33      const FinalState& fs = apply<FinalState>(event, "FS");
34      if(fs.particles().size()!=2) vetoEvent;
35      for (const Particle& p : fs.particles()) {
36	if(abs(p.pid())!=PID::PROTON) vetoEvent;
37      }
38      _nproton->fill();
39    }
40
41
42    /// Normalise histograms etc., after the run
43    void finalize() {
44      double sigma = _nproton->val();
45      double error = _nproton->err();
46      sigma *= crossSection()/ sumOfWeights() /nanobarn;
47      error *= crossSection()/ sumOfWeights() /nanobarn;
48      Estimate1DPtr mult;
49      book(mult, 1, 1, 1);
50      for (auto& b : mult->bins()) {
51        if (inRange(sqrtS()/MeV, b.xMin(), b.xMax())) {
52          b.set(sigma, error);
53        }
54      }
55    }
56
57    /// @}
58
59
60    /// @name Histograms
61    /// @{
62    CounterPtr _nproton;
63    /// @}
64
65
66  };
67
68
69  RIVET_DECLARE_PLUGIN(DM2_1983_I190558);
70
71
72}