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 CRYSTAL_BALL_1988_I261078 : public Analysis {
10  public:
11
12    /// Constructor
13    RIVET_DEFAULT_ANALYSIS_CTOR(CRYSTAL_BALL_1988_I261078);
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");
26      book(_c_muons, "sigma_muons");
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      if (nCount[-13]==1 and nCount[13]==1 && ntotal==2+nCount[22]) {
41        _c_muons->fill(Ecm); // mu+mu- + photons
42      }
43      else {
44        _c_hadrons->fill(Ecm); // everything else
45      }
46    }
47
48
49    /// Normalise histograms etc., after the run
50    void finalize() {
51      const double fact = crossSection()/ sumOfWeights() /picobarn;
52      scale( {_c_hadrons, _c_muons}, fact);
53      divide(_c_hadrons, _c_muons, _mult);
54    }
55    /// @}
56
57
58    /// @name Histograms
59    /// @{
60    BinnedHistoPtr<string> _c_hadrons, _c_muons;
61    BinnedEstimatePtr<string> _mult;
62    const string Ecm = "9.39";
63    /// @}
64
65
66  };
67
68
69  RIVET_DECLARE_PLUGIN(CRYSTAL_BALL_1988_I261078);
70
71
72}