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_1981_I166365 : public Analysis {
10  public:
11
12    /// Constructor
13    RIVET_DEFAULT_ANALYSIS_CTOR(CELLO_1981_I166365);
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(1,1,1));
25      book(_c_muons,   "/TMP/sigma_muons"  ,refData(1,1,1));
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 && ntotal==2+nCount[22])
41        _c_muons->fill(sqrtS()/GeV);
42      // everything else
43      else {
44        _c_hadrons->fill(sqrtS()/GeV);
45      }
46    }
47
48
49    /// Normalise histograms etc., after the run
50    void finalize() {
51      Estimate1DPtr mult;
52      book(mult, 1, 1, 1);
53      divide(_c_hadrons,_c_muons,mult);
54    }
55
56    /// @}
57
58
59    /// @name Histograms
60    /// @{
61    Histo1DPtr _c_hadrons, _c_muons;
62    /// @}
63
64
65  };
66
67
68  RIVET_DECLARE_PLUGIN(CELLO_1981_I166365);
69
70
71}