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 LENA_1982_I179431 : public Analysis {
10  public:
11
12    /// Constructor
13    RIVET_DEFAULT_ANALYSIS_CTOR(LENA_1982_I179431);
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      for (size_t i=0; i<2; ++i) {
26        const auto& ref = refData(i+1, 1, 1);
27        book(_h_hadrons[i], "d0"+to_string(i+1)+"_sigma_hadrons", ref);
28        book(_h_muons[i], "d0"+to_string(i+1)+"_sigma_muons", ref);
29        book(_ratios[i], i+1, 1, 1);
30      }
31      book(_c_hadrons, "d03_sigma_hadrons");
32      book(_c_muons, "d03_sigma_muons");
33    }
34
35
36    /// Perform the per-event analysis
37    void analyze(const Event& event) {
38      const FinalState& fs = apply<FinalState>(event, "FS");
39
40      map<long,int> nCount;
41      int ntotal(0);
42      for (const Particle& p : fs.particles()) {
43        nCount[p.pid()] += 1;
44        ++ntotal;
45      }
46      // mu+mu- + photons
47      if (nCount[-13]==1 and nCount[13]==1 && ntotal==2+nCount[22]) {
48        _h_muons[0]->fill(sqrtS()/GeV);
49        _h_muons[1]->fill(sqrtS()/GeV);
50        _c_muons->fill();
51      }
52      // everything else
53      else {
54        _h_hadrons[0]->fill(sqrtS()/GeV);
55        _h_hadrons[1]->fill(sqrtS()/GeV);
56        _c_hadrons->fill();
57      }
58    }
59
60
61    /// Normalise histograms etc., after the run
62    void finalize() {
63      const double fact = crossSection() / sumOfWeights() / picobarn;
64      scale(_h_hadrons, fact);
65      scale(_h_muons, fact);
66      scale({_c_hadrons, _c_muons}, fact);
67      divide(_h_hadrons[0], _h_muons[0], _ratios[0]);
68      divide(_h_hadrons[1], _h_muons[1], _ratios[1]);
69      const Estimate0D R =  *_c_hadrons / *_c_muons;
70      BinnedEstimatePtr<string> mult;
71      book(mult, 3, 1, 1);
72      for (auto& b : mult->bins()) {
73        const double Ecm = std::stod(b.xEdge());
74        if (isCompatibleWithSqrtS(Ecm/GeV)) {
75          b.set(R.val(), R.errPos());
76        }
77      }
78    }
79
80    /// @}
81
82
83    /// @name Histograms
84    /// @{
85    CounterPtr _c_hadrons, _c_muons;
86    Histo1DPtr _h_hadrons[2], _h_muons[2];
87    Estimate1DPtr _ratios[2];
88    /// @}
89
90
91  };
92
93
94  RIVET_DECLARE_PLUGIN(LENA_1982_I179431);
95
96
97}