Rivet analyses referenceLHCB_2013_I1230344Differential cross sections for $J/\psi$ and $\Upsilon(1,2,3S)$ production at 8 TeVExperiment: LHCB (LHC) Inspire ID: 1230344 Status: VALIDATED Authors:
Beam energies: (4000.0, 4000.0) GeV Run details:
Measurement of the double differential (in $p_\perp$ and $y$) cross section for $J/\psi$ and $\Upsilon(1,2,3S)$ production at 8 TeV by the LHCB collaboration. Source code: LHCB_2013_I1230344.cc 1// -*- C++ -*-
2#include "Rivet/Analysis.hh"
3#include "Rivet/Projections/UnstableParticles.hh"
4
5namespace Rivet {
6
7
8 /// @brief J/psi and Upslion production at 8 TeV
9 class LHCB_2013_I1230344 : public Analysis {
10 public:
11
12 /// Constructor
13 RIVET_DEFAULT_ANALYSIS_CTOR(LHCB_2013_I1230344);
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 for(unsigned iy=0;iy<2;++iy)
23 book(_h_Jpsi_y[iy],2,1,iy+1);
24 for(unsigned int iy=0;iy<3;++iy) {
25 book(_h_Jpsi[iy],{2.0,2.5,3.0,3.5,4.0,4.5});
26 for(unsigned int ix=0;ix<5;++ix) {
27 if(iy<2)
28 book(_h_Jpsi[iy]->bin(ix+1),3+ix,1,1+iy);
29 else
30 book(_h_Jpsi[iy]->bin(ix+1),"TMP/Jpsi_"+toString(ix),refData(3+ix,1,1));
31 }
32 }
33 for(unsigned int iy=0;iy<3;++iy) {
34 book(_h_Ups_pT [iy], 9,1,iy+1);
35 book(_h_Ups_y [iy],10,1,iy+1);
36 book(_h_Ups_pT_r[iy],"TMP/Ups_pT_"+toString(iy),refData(16,1,1));
37 book(_h_Ups_y_r [iy],"TMP/Ups_y_" +toString(iy),refData(17,1,1));
38 book(_h_Ups[iy],{2.0,2.5,3.0,3.5,4.0,4.5});
39 for(unsigned int ix=0;ix<5;++ix) {
40 book(_h_Ups[iy]->bin(ix+1),11+ix,1,1+iy);
41 }
42 }
43 }
44
45
46 /// Perform the per-event analysis
47 void analyze(const Event& event) {
48
49 // Final state of unstable particles to get particle spectra
50 const UnstableParticles& ufs = apply<UnstableParticles>(event, "UFS");
51 // J/psi
52 for (const Particle& p : ufs.particles(Cuts::pid==443)) {
53 // prompt/non-prompt
54 bool nonPrompt = p.fromBottom();
55 double absrap = p.absrap();
56 double xp = p.perp();
57 if(absrap<2. || absrap>4.5 || xp>14.) continue;
58 _h_Jpsi_y[nonPrompt]->fill(absrap);
59 _h_Jpsi[nonPrompt] ->fill(absrap,xp);
60 _h_Jpsi[2 ] ->fill(absrap,xp);
61 }
62 // upsilon
63 for (const Particle& p : ufs.particles(Cuts::pid==553 or Cuts::pid==100553 or Cuts::pid==200553)) {
64 double absrap = p.absrap();
65 double xp = p.perp();
66 if(absrap<2. || absrap>4.5 || xp>15.) continue;
67 unsigned int iups=p.pid()/100000;
68 _h_Ups_pT[iups] ->fill(xp);
69 _h_Ups_y[iups] ->fill(absrap);
70 _h_Ups_pT_r[iups]->fill(xp);
71 _h_Ups_y_r[iups] ->fill(absrap);
72 _h_Ups[iups] ->fill(absrap,xp);
73 }
74
75 }
76
77
78 /// Normalise histograms etc., after the run
79 void finalize() {
80 // 1/2 due rapidity folding +/-
81 double factor = 0.5*crossSection()/nanobarn/sumOfWeights();
82 // branching ratios for upsilon
83 vector<double> br = {0.0248,0.0193,0.0218};
84 for(unsigned int ix=0;ix<2;++ix) {
85 scale(_h_Jpsi_y[ix],factor);
86 }
87 for(unsigned int ix=0;ix<3;++ix) {
88 scale(_h_Ups_pT [ix],factor*br[ix]);
89 scale(_h_Ups_y [ix],factor*br[ix]);
90 scale(_h_Ups_pT_r[ix],factor*br[ix]);
91 scale(_h_Ups_y_r [ix],factor*br[ix]);
92 scale(_h_Ups[ix] ,factor*1000.*br[ix]);
93 divByGroupWidth(_h_Ups[ix]);
94 scale(_h_Jpsi[ix],factor);
95 divByGroupWidth(_h_Jpsi[ix]);
96 }
97 for(unsigned int ix=0;ix<_h_Jpsi[0]->numBins();++ix) {
98 Estimate1DPtr tmp;
99 book(tmp,3+ix,1,3);
100 divide(_h_Jpsi[1]->bin(ix+1),_h_Jpsi[2]->bin(ix+1),tmp);
101 tmp->scale(100.);
102 }
103 for(unsigned int ix=0;ix<2;++ix) {
104 Estimate1DPtr tmp;
105 book(tmp,16,1,1+ix);
106 divide(_h_Ups_pT_r[ix+1],_h_Ups_pT_r[0],tmp);
107 book(tmp,17,1,1+ix);
108 divide(_h_Ups_y_r[ix+1],_h_Ups_y_r[0],tmp);
109 }
110 }
111
112 /// @}
113
114
115 /// @name Histograms
116 /// @{
117 Histo1DPtr _h_Jpsi_y[2],_h_Ups_pT[3],_h_Ups_y[3],_h_Ups_pT_r[3],_h_Ups_y_r[3];
118 Histo1DGroupPtr _h_Jpsi[3],_h_Ups[3];
119 /// @}
120
121
122 };
123
124
125 RIVET_DECLARE_PLUGIN(LHCB_2013_I1230344);
126
127}
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