Rivet analyses referenceLHCB_2014_I1298273$\Lambda_b^0$ fraction at 7 TeVExperiment: LHCB (LHC) Inspire ID: 1298273 Status: VALIDATED NOHEPDATA Authors:
Beam energies: (3500.0, 3500.0) GeV Run details:
Measurement of the fraction of $\Lambda_b^0$ production at 13 TeV by the LHCb collaboration. Source code: LHCB_2014_I1298273.cc 1// -*- C++ -*-
2#include "Rivet/Analysis.hh"
3#include "Rivet/Projections/UnstableParticles.hh"
4
5namespace Rivet {
6
7
8 /// @brief Lambda_b fraction at 7 TeV
9 class LHCB_2014_I1298273 : public Analysis {
10 public:
11
12 /// Constructor
13 RIVET_DEFAULT_ANALYSIS_CTOR(LHCB_2014_I1298273);
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 int ix=0;ix<2;++ix) {
23 book(_h_pT[ix],"TMP/h_pT_"+toString(ix),refData(1,1,1));
24 book(_h_y [ix],"TMP/h_y_" +toString(ix),refData(2,1,1));
25 }
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(Cuts::abspid==5122 || Cuts::abspid==511)) {
35 // skip copies due mixing
36 if(p.children().size()==1 && p.children()[0].abspid()==p.abspid()) continue;
37 double eta=p.abseta();
38 if(eta<2. || eta>5.) continue;
39 double pT = p.perp();
40 if(pT<1.5 || pT>40.) continue;
41 if(p.abspid()==5122) {
42 _h_pT[0]->fill(pT);
43 _h_y[0]->fill(eta);
44 }
45 else {
46 _h_pT[1]->fill(pT);
47 _h_y[1]->fill(eta);
48 }
49 }
50 }
51
52
53 /// Normalise histograms etc., after the run
54 void finalize() {
55 Estimate1DPtr tmp;
56 book(tmp,1,1,1);
57 divide(_h_pT[0],_h_pT[1],tmp);
58 book(tmp,2,1,1);
59 divide(_h_y [0],_h_y[1],tmp);
60 }
61
62 /// @}
63
64
65 /// @name Histograms
66 /// @{
67 Histo1DPtr _h_pT[2],_h_y[2];
68 /// @}
69
70
71 };
72
73
74 RIVET_DECLARE_PLUGIN(LHCB_2014_I1298273);
75
76}
|