Rivet analyses referenceMARKJ_1979_I141976Measurement of $R$ at 31.57 GeVExperiment: MARKJ (PETRA) Inspire ID: 141976 Status: VALIDATED Authors:
Beam energies: ANY Run details:
Measurement of $R$ in $e^+e^-$ collisions by MARKJ for 31.57 GeV. The individual hadronic and muonic cross sections are also outputted to the yoda file so that ratio $R$ can be recalculated if runs are combined. Source code: MARKJ_1979_I141976.cc 1// -*- C++ -*-
2#include "Rivet/Analysis.hh"
3#include "Rivet/Projections/FinalState.hh"
4
5namespace Rivet {
6
7
8 /// @brief Add a short analysis description here
9 class MARKJ_1979_I141976 : public Analysis {
10 public:
11
12 /// Constructor
13 RIVET_DEFAULT_ANALYSIS_CTOR(MARKJ_1979_I141976);
14
15
16 /// @name Analysis methods
17 /// @{
18
19 /// Book histograms and initialise projections before the run
20 void init() {
21 // Initialise and register projections
22 declare(FinalState(), "FS");
23
24 // Book histograms
25 book(_c_hadrons, "sigma_hadrons", refData<YODA::BinnedEstimate<string>>(1,1,1));
26 book(_c_muons, "sigma_muons", refData<YODA::BinnedEstimate<string>>(1,1,1));
27 }
28
29
30 /// Perform the per-event analysis
31 void analyze(const Event& event) {
32 const FinalState& fs = apply<FinalState>(event, "FS");
33
34 map<long,int> nCount;
35 int ntotal(0);
36 for (const Particle& p : fs.particles()) {
37 nCount[p.pid()] += 1;
38 ++ntotal;
39 }
40 // mu+mu- + photons
41 if (nCount[-13]==1 and nCount[13]==1 && ntotal==2+nCount[22]) {
42 _c_muons->fill(Ecm);
43 }
44 // everything else
45 else {
46 _c_hadrons->fill(Ecm);
47 }
48 }
49
50
51 /// Normalise histograms etc., after the run
52 void finalize() {
53 const double fact = crossSection()/ sumOfWeights() /picobarn;
54 scale({_c_hadrons, _c_muons}, fact);
55 BinnedEstimatePtr<string> mult;
56 book(mult, 1, 1, 1);
57 divide(_c_hadrons, _c_muons, mult);
58 }
59
60 /// @}
61
62
63 /// @name Histograms
64 /// @{
65 BinnedHistoPtr<string> _c_hadrons, _c_muons;
66 const string Ecm = "31.57";
67 /// @}
68
69
70 };
71
72
73 RIVET_DECLARE_PLUGIN(MARKJ_1979_I141976);
74
75
76}
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