1// -*- C++ -*-
 2#include "Rivet/Analysis.hh"
 3#include "Rivet/Projections/FinalState.hh"
 4
 5namespace Rivet {
 6
 7
 8  /// @brief R measurement
 9  class CELLO_1984_I202783 : public Analysis {
10  public:
11
12    /// Constructor
13    RIVET_DEFAULT_ANALYSIS_CTOR(CELLO_1984_I202783);
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      // counters for R
24      book(_c_hadrons, "/TMP/sigma_hadrons",refData(2,1,1));
25      book(_c_muons,   "/TMP/sigma_muons"  ,refData(2,1,1));
26    }
27
28
29    /// Perform the per-event analysis
30    void analyze(const Event& event) {
31      const FinalState& fs = apply<FinalState>(event, "FS");
32
33      map<long,int> nCount;
34      int ntotal(0);
35      for (const Particle& p : fs.particles()) {
36        nCount[p.pid()] += 1;
37        ++ntotal;
38      }
39      // mu+mu- + photons
40      if(nCount[-13]==1 and nCount[13]==1 &&
41         ntotal==2+nCount[22])
42        _c_muons->fill(sqrtS()/GeV);
43      // everything else
44      else {
45        _c_hadrons->fill(sqrtS()/GeV);
46      }
47
48    }
49
50
51    /// Normalise histograms etc., after the run
52    void finalize() {
53      Estimate1DPtr mult;
54      book(mult, 2, 1, 1);
55      divide(_c_hadrons,_c_muons,mult);
56    }
57
58    /// @}
59
60
61    /// @name Histograms
62    /// @{
63    Histo1DPtr _c_hadrons, _c_muons;
64    /// @}
65
66
67  };
68
69
70  RIVET_DECLARE_PLUGIN(CELLO_1984_I202783);
71
72
73}