1// -*- C++ -*-
 2#include "Rivet/Analysis.hh"
 3#include "Rivet/Projections/FinalState.hh"
 4
 5namespace Rivet {
 6
 7
 8  /// @brief Hadronic cross section measurement
 9  class CLEO_1983_I188803 : public Analysis {
10  public:
11
12    /// Constructor
13    RIVET_DEFAULT_ANALYSIS_CTOR(CLEO_1983_I188803);
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, 2, 1, 1);
26      for (const string& en : _c_hadrons.binning().edges<0>()) {
27        double end = std::stod(en)*GeV;
28        if(isCompatibleWithSqrtS(end)) {
29          _ecms = en;
30          break;
31        }
32      }
33      if(_ecms.empty())
34        MSG_ERROR("Beam energy incompatible with analysis.");
35    }
36
37
38    /// Perform the per-event analysis
39    void analyze(const Event& event) {
40      const FinalState& fs = apply<FinalState>(event, "FS");
41
42      map<long,int> nCount;
43      int ntotal(0);
44      for (const Particle& p : fs.particles()) {
45	nCount[p.pid()] += 1;
46	++ntotal;
47      }
48      // mu+mu- + photons
49      if(nCount[-13]==1 and nCount[13]==1 &&
50	 ntotal==2+nCount[22])
51	vetoEvent;
52      // everything else
53      else
54	_c_hadrons->fill(_ecms);
55    }
56
57
58    /// Normalise histograms etc., after the run
59    void finalize() {
60      double fact = crossSection()/ sumOfWeights() /nanobarn;
61      scale(_c_hadrons,fact);
62    }
63
64    /// @}
65
66
67    /// @name Histograms
68    /// @{
69    BinnedHistoPtr<string> _c_hadrons;
70    string _ecms;
71    /// @}
72
73
74  };
75
76
77  RIVET_DECLARE_PLUGIN(CLEO_1983_I188803);
78
79
80}