1// -*- C++ -*-
 2#include "Rivet/Analysis.hh"
 3#include "Rivet/Projections/UnstableParticles.hh"
 4
 5namespace Rivet {
 6
 7
 8  /// @brief B+ at 7 TeV
 9  class CMS_2011_I883318 : public Analysis {
10  public:
11
12    /// Constructor
13    RIVET_DEFAULT_ANALYSIS_CTOR(CMS_2011_I883318);
14
15
16    /// @name Analysis methods
17    /// @{
18
19    /// Book histograms and initialise projections before the run
20    void init() {
21      // projection
22      declare(UnstableParticles(), "UFS");
23      // histograms
24      book(_h_total, 1, 1, 1);
25      book(_h_pT   , 2, 1, 1);
26      book(_h_y    , 3, 1, 1);
27    }
28
29
30    /// Perform the per-event analysis
31    void analyze(const Event& event) {
32      if (_edges[0].empty()) {
33        _edges[0] = _h_total->xEdges();
34        _edges[1] = _h_pT->xEdges();
35      }
36      // Final state of unstable particles to get particle spectra
37      const UnstableParticles& ufs = apply<UnstableParticles>(event, "UFS");
38      // loop over B+ states
39      for (const Particle& p : ufs.particles(Cuts::abspid==521)) {
40        // cuts on pT and rapidity
41        const double y  = p.absrap();
42        const double pT = p.perp();
43        if (pT<5. || y>2.4) continue;
44        _h_total->fill(_edges[0][0]);
45        const size_t idx = _axis.index(pT);
46        const string edge = (idx&&idx<_edges[1].size()) ? _edges[1][idx-1] : "OTHER"s;
47        _h_pT->fill(edge);
48        _h_y->fill(y);
49      }
50    }
51
52
53    /// Normalise histograms etc., after the run
54    void finalize() {
55      const double fact = 0.5*crossSection()/microbarn/sumOfWeights();
56      scale(_h_total, fact);
57      scale(_h_pT, fact);
58      for (auto& b : _h_pT->bins()) {
59        const size_t idx = b.index();
60        b.scaleW(1.0/_axis.width(idx));
61      }
62      // 0.5 from +/- y
63      scale(_h_y, 0.5*fact);
64    }
65
66    /// @}
67
68
69    /// @name Histograms
70    /// @{
71    BinnedHistoPtr<string> _h_total,_h_pT;
72    Histo1DPtr _h_y;
73    vector<string> _edges[2];
74    YODA::Axis<double> _axis{5.0,10.0,13.0,17.0,24.0,30.0};
75    /// @}
76
77
78  };
79
80
81  RIVET_DECLARE_PLUGIN(CMS_2011_I883318);
82
83}