1// -*- C++ -*-
 2#include "Rivet/Analysis.hh"
 3#include "Rivet/Projections/UnstableParticles.hh"
 4
 5
 6namespace Rivet {
 7
 8
 9  /// @brief prompt J/psi and psi(2S) at 7 TeV
10  class CMS_2015_I1345023 : public Analysis {
11  public:
12
13    /// Constructor
14    RIVET_DEFAULT_ANALYSIS_CTOR(CMS_2015_I1345023);
15
16
17    /// @name Analysis methods
18    /// @{
19
20    /// Book histograms and initialise projections before the run
21    void init() {
22      // projection
23      declare(UnstableParticles(), "UFS");
24      // J/psi/psi(2s) histos
25      for (unsigned int ipsi=0;ipsi<2;++ipsi) {
26        book(_h_psi[ipsi], {0.,0.3,0.6,0.9,1.2});
27        for (unsigned int iy=1;iy<5;++iy) {
28          Histo1DPtr tmp;
29          book(_h_psi[ipsi]->bin(iy),ipsi+1,1,iy);
30        }
31        book(_h_pT[ipsi][0],3+ipsi,1,1);
32        book(_h_pT[ipsi][1],"TMP/psi_"+toString(ipsi),refData(5, 1, 1));
33      }
34    }
35
36
37    /// Perform the per-event analysis
38    void analyze(const Event& event) {
39      // Final state of unstable particles to get particle spectra
40      const UnstableParticles& ufs = apply<UnstableParticles>(event, "UFS");
41      // loop over onium states
42      for (const Particle& p : ufs.particles(Cuts::pid==443 or Cuts::pid==100443)) {
43        // prompt
44        if (p.fromBottom()) continue;
45        // cuts on rapidity
46        const double y = p.absrap();
47        if (y>1.2) continue;
48        const double pT = p.perp();
49        unsigned int ipsi=p.pid()/100000;
50        _h_psi[ipsi]->fill(y,pT);
51        _h_pT[ipsi][0]->fill(pT);
52        _h_pT[ipsi][1]->fill(pT);
53      }
54    }
55
56
57    /// Normalise histograms etc., after the run
58    void finalize() {
59      // 0.5 due folded rapidity
60      const double factor = 0.5*crossSection() / picobarn/ sumOfWeights();
61      // branching ratios to muons
62      const vector<double> brs={0.05961,0.00793};
63      for (unsigned int ix=0; ix<2; ++ix) {
64        scale(_h_psi[ix], factor*brs[ix]);
65        divByGroupWidth(_h_psi[ix]);
66        scale(_h_pT[ix][0],brs[ix]*factor/1.2);
67        scale(_h_pT[ix][1],brs[ix]*factor/1.2);
68      }
69      // ratio plots
70      Estimate1DPtr tmp;
71      book(tmp,5,1,1);
72      divide(_h_pT[1][1],_h_pT[0][1],tmp);
73      // convert to %age
74      tmp->scale(100.);
75    }
76
77    /// @}
78
79
80    /// @name Histograms
81    /// @{
82    Histo1DGroupPtr _h_psi[2];
83    Histo1DPtr _h_pT[2][2];
84    /// @}
85
86
87  };
88
89
90  RIVET_DECLARE_PLUGIN(CMS_2015_I1345023);
91
92}