1// -*- C++ -*-
 2#include "Rivet/Analysis.hh"
 3#include "Rivet/Projections/FinalState.hh"
 4
 5namespace Rivet {
 6
 7
 8  /// @brief Add a short analysis description here
 9  class MARKJ_1979_I141976 : public Analysis {
10  public:
11
12    /// Constructor
13    RIVET_DEFAULT_ANALYSIS_CTOR(MARKJ_1979_I141976);
14
15
16    /// @name Analysis methods
17    /// @{
18
19    /// Book histograms and initialise projections before the run
20    void init() {
21      // Initialise and register projections
22      declare(FinalState(), "FS");
23
24      // Book histograms
25      book(_c_hadrons, "sigma_hadrons", refData<YODA::BinnedEstimate<string>>(1,1,1));
26      book(_c_muons, "sigma_muons", refData<YODA::BinnedEstimate<string>>(1,1,1));
27    }
28
29
30    /// Perform the per-event analysis
31    void analyze(const Event& event) {
32      const FinalState& fs = apply<FinalState>(event, "FS");
33
34      map<long,int> nCount;
35      int ntotal(0);
36      for (const Particle& p : fs.particles()) {
37        nCount[p.pid()] += 1;
38        ++ntotal;
39      }
40      // mu+mu- + photons
41      if (nCount[-13]==1 and nCount[13]==1 &&  ntotal==2+nCount[22]) {
42        _c_muons->fill(Ecm);
43      }
44      // everything else
45      else {
46        _c_hadrons->fill(Ecm);
47      }
48    }
49
50
51    /// Normalise histograms etc., after the run
52    void finalize() {
53      const double fact = crossSection()/ sumOfWeights() /picobarn;
54      scale({_c_hadrons, _c_muons}, fact);
55      BinnedEstimatePtr<string> mult;
56      book(mult, 1, 1, 1);
57      divide(_c_hadrons, _c_muons, mult);
58    }
59
60    /// @}
61
62
63    /// @name Histograms
64    /// @{
65    BinnedHistoPtr<string> _c_hadrons, _c_muons;
66    const string Ecm = "31.57";
67    /// @}
68
69
70  };
71
72
73  RIVET_DECLARE_PLUGIN(MARKJ_1979_I141976);
74
75
76}