1// -*- C++ -*-
 2#include "Rivet/Analysis.hh"
 3#include "Rivet/Projections/FinalState.hh"
 4
 5namespace Rivet {
 6
 7
 8  /// @brief gamma gamma -> K+ K- pi+ pi-
 9  class ARGUS_1988_I260828 : public Analysis {
10  public:
11
12    /// Constructor
13    RIVET_DEFAULT_ANALYSIS_CTOR(ARGUS_1988_I260828);
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      // histos
24      book(_h, 1, 1, 1);
25
26      _edge = "OTHER"s;
27      for (const string& edge : _h.binning().edges<0>()) {
28        if (isCompatibleWithSqrtS(std::stod(edge)*GeV)) {
29          _edge = edge;
30        }
31      }
32    }
33
34
35    /// Perform the per-event analysis
36    void analyze(const Event& event) {
37      const FinalState& fs = apply<FinalState>(event, "FS");
38      // find the final-state particles
39      map<long,int> nCount;
40      int ntotal(0);
41      for (const Particle& p : fs.particles()) {
42        nCount[p.pid()] += 1;
43        ++ntotal;
44      }
45      if (ntotal==5 && nCount[211]==1 && nCount[-211]==1 &&
46          nCount[321]==1 && nCount[-321]==1 && nCount[111]==1) _h->fill(_edge);
47    }
48
49
50    /// Normalise histograms etc., after the run
51    void finalize() {
52      scale(_h, crossSection()/nanobarn/sumOfWeights());
53    }
54
55    /// @}
56
57
58    /// @name Histograms
59    /// @{
60    BinnedHistoPtr<string> _h;
61    string _edge;
62    /// @}
63
64
65  };
66
67
68  RIVET_DECLARE_PLUGIN(ARGUS_1988_I260828);
69
70}