1// -*- C++ -*-
 2#include "Rivet/Analysis.hh"
 3#include "Rivet/Projections/UnstableParticles.hh"
 4
 5namespace Rivet {
 6
 7
 8  /// @brief J/psi production at 2.76 TeV
 9  class ALICE_2012_I1094079 : public Analysis {
10  public:
11
12    /// Constructor
13    RIVET_DEFAULT_ANALYSIS_CTOR(ALICE_2012_I1094079);
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(Cuts::pid == 443), "UFS");
23      // histos
24      book(_h_pT,1,1,1);
25      book(_h_y ,4,1,1);
26    }
27
28
29    /// Perform the per-event analysis
30    void analyze(const Event& event) {
31      // Final state of unstable particles to get particle spectra
32      const UnstableParticles& ufs = apply<UnstableParticles>(event, "UFS");
33      // loop over onium states
34      for (const Particle& p : ufs.particles()) {
35        // cuts on pT and rapidity
36        double y = p.absrap();
37        if (y>2.5 && y<4.) {
38          _h_pT->fill(p.perp());
39        }
40        _h_y->fill(p.rap());
41      }
42    }
43
44
45    /// Normalise histograms etc., after the run
46    void finalize() {
47      double factor = crossSection() / microbarn/ sumOfWeights();
48      scale(_h_pT,factor/3.);
49      scale(_h_y ,factor);
50    }
51
52    ///@}
53
54
55    /// @name Histograms
56    ///@{
57    Histo1DPtr _h_pT,_h_y;
58    ///@}
59
60
61  };
62
63
64  RIVET_DECLARE_PLUGIN(ALICE_2012_I1094079);
65
66}