1// -*- C++ -*-
 2#include "Rivet/Analysis.hh"
 3#include "Rivet/Projections/UnstableParticles.hh"
 4#include "Rivet/Projections/Beam.hh"
 5
 6namespace Rivet {
 7
 8
 9  /// @brief D*+ production at 34.4 GeV
10  class JADE_1984_I202785 : public Analysis {
11  public:
12
13    /// Constructor
14    RIVET_DEFAULT_ANALYSIS_CTOR(JADE_1984_I202785);
15
16
17    /// @name Analysis methods
18    /// @{
19
20    /// Book histograms and initialise projections before the run
21    void init() {
22      declare(Beam(), "Beams");
23      declare(UnstableParticles(), "UFS");
24
25      // Book histograms
26      book(_h_x, 1, 1, 1);
27      book(_h_theta, 3, 1, 1);
28      _axis = YODA::Axis<double>(6, -0.9, 0.9);
29    }
30
31
32    /// Perform the per-event analysis
33    void analyze(const Event& event) {
34
35      if (_edges.empty())  _edges = _h_theta->xEdges();
36      // Get beams and average beam momentum
37      const ParticlePair& beams = apply<Beam>(event, "Beams").beams();
38      const double meanBeamMom = ( beams.first.p3().mod() +
39                                   beams.second.p3().mod() ) / 2.0;
40      MSG_DEBUG("Avg beam momentum = " << meanBeamMom);
41      Vector3 axis = beams.first.pid() == PID::EMINUS ? beams.first.p3().unit() : beams.second.p3().unit();
42      const UnstableParticles& ufs = apply<UnstableParticles>(event, "UFS");
43      for (const Particle& p : ufs.particles(Cuts::abspid==413)) {
44        double modp = p.p3().mod();
45        double xE =p.E()/meanBeamMom;
46        _h_x->fill(xE);
47        if(xE>0.4 && p.pid()>0) {
48          _h_theta->fill(map2string(p.p3().dot(axis)/modp));
49        }
50      }
51    }
52
53
54    /// Normalise histograms etc., after the run
55    void finalize() {
56
57      normalize(_h_theta,33.6,false); // normalize to data
58      scale(_h_x, crossSection()/microbarn/sumOfWeights()*sqr(sqrtS()));
59      for(auto & b: _h_theta->bins()) {
60        const size_t idx = b.index();
61        b.scaleW(1./_axis.width(idx));
62      }
63
64    }
65
66    /// @}
67
68    string map2string(const double value) const {
69      const size_t idx = _axis.index(value);
70      if (idx && idx <= _edges.size())  return _edges[idx-1];
71      return "OTHER";
72    }
73
74
75    /// @name Histograms
76    /// @{
77    Histo1DPtr _h_x;
78    BinnedHistoPtr<string> _h_theta;
79    YODA::Axis<double> _axis;
80    vector<string> _edges;
81    /// @}
82
83
84  };
85
86
87  RIVET_DECLARE_PLUGIN(JADE_1984_I202785);
88
89
90}