1// -*- C++ -*-
 2#include "Rivet/Analysis.hh"
 3#include "Rivet/Projections/UnstableParticles.hh"
 4
 5namespace Rivet {
 6
 7
 8  /// @brief J/psi production at 5.02 TeV
 9  class LHCB_2021_I1915030 : public Analysis {
10  public:
11
12    /// Constructor
13    RIVET_DEFAULT_ANALYSIS_CTOR(LHCB_2021_I1915030);
14
15
16    /// @name Analysis methods
17    /// @{
18
19    /// Book histograms and initialise projections before the run
20    void init() {
21      declare(UnstableParticles(), "UFS");
22      // histograms
23      for(int ix=0;ix<3;++ix) {
24        book(_h_JPsi[ix],{2.0,2.5,3.0,3.5,4.0,4.5});
25        for(int iy=0;iy<5;++iy) {
26          if(ix<2)
27            book(_h_JPsi[ix]->bin(iy+1),ix+1,1,iy+1);
28          else
29            book(_h_JPsi[ix]->bin(iy+1),"TMP/JPsi_"+toString(iy) , refData(1,1,iy+1));
30        }
31      }
32      book(_h_JPsi_pT[0],3,1,1);
33      book(_h_JPsi_pT[1],4,1,1);
34      book(_h_JPsi_y [0],5,1,1);
35      book(_h_JPsi_y [2],5,1,2);
36      book(_h_JPsi_y [1],6,1,1);
37    }
38
39
40    /// Perform the per-event analysis
41    void analyze(const Event& event) {
42
43      // Final state of unstable particles to get particle spectra
44      const UnstableParticles& ufs = apply<UnstableParticles>(event, "UFS");
45
46      for (const Particle& p : ufs.particles(Cuts::pid==443)) {
47	// prompt/non-prompt
48	bool nonPrompt = p.fromBottom();
49        double absrap = p.absrap();
50        double xp = p.perp();
51	_h_JPsi[nonPrompt]->fill(absrap,xp);
52	_h_JPsi[2        ]->fill(absrap,xp);
53	if(absrap>2. && absrap<4.5)
54	  _h_JPsi_pT[nonPrompt]->fill(xp);
55	if(xp<14.)
56	  _h_JPsi_y [nonPrompt]->fill(absrap);
57	if(xp<8. && !nonPrompt)
58	  _h_JPsi_y [2]->fill(absrap);
59      }
60    }
61
62
63    /// Normalise histograms etc., after the run
64    void finalize() {
65      // factor of 2 due rapidity +/-
66      double factor = 0.5*crossSection()/nanobarn/sumOfWeights();
67      for(unsigned int ix=0;ix<3;++ix) {
68	scale(_h_JPsi[ix], factor);
69        divByGroupWidth(_h_JPsi[ix]);
70	scale(_h_JPsi_y[ix],factor);
71	if(ix<2)
72	  scale(_h_JPsi_pT[ix],factor);
73      }
74      for(unsigned int iy=0;iy<_h_JPsi[0]->numBins();++iy) {
75	// non-prompt J/psi percentage
76	Estimate1DPtr tmp;
77	book(tmp,7,1,iy+1);
78	efficiency(_h_JPsi[1]->bin(iy+1),_h_JPsi[2]->bin(iy+1),tmp);
79	tmp->scale(100.);
80      }
81    }
82
83    /// @}
84
85
86    /// @name Histograms
87    /// @{
88    Histo1DGroupPtr _h_JPsi[3];
89    Histo1DPtr _h_JPsi_pT[2],_h_JPsi_y[3];
90    /// @}
91
92
93  };
94
95
96  RIVET_DECLARE_PLUGIN(LHCB_2021_I1915030);
97
98}