Rivet analyses referenceMARKJ_1984_I196567Measurement of $R$ between 12 and 42.63 GeVExperiment: MARKJ (PETRA) Inspire ID: 196567 Status: VALIDATED Authors:
Beam energies: (6.0, 6.0); (7.0, 7.0); (11.0, 11.0); (12.5, 12.5); (15.3, 15.3); (16.5, 16.5); (16.9, 16.9); (17.3, 17.3); (17.5, 17.5); (18.2, 18.2); (19.1, 19.1); (20.2, 20.2); (20.8, 20.8); (21.3, 21.3) GeV Run details:
Measurement of $R$ in $e^+e^-$ collisions by MARKJ between 42.63 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_1984_I196567.cc 1// -*- C++ -*-
2#include "Rivet/Analysis.hh"
3#include "Rivet/Projections/FinalState.hh"
4
5namespace Rivet {
6
7
8 /// @brief R measurement
9 class MARKJ_1984_I196567 : public Analysis {
10 public:
11
12 /// Constructor
13 RIVET_DEFAULT_ANALYSIS_CTOR(MARKJ_1984_I196567);
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, "/TMP/sigma_hadron", refData<YODA::BinnedEstimate<string>>(1,1,1));
26 book(_c_muons, "/TMP/sigma_muons" , refData<YODA::BinnedEstimate<string>>(1,1,1));
27 for (const string& en : _c_hadrons.binning().edges<0>()) {
28 double end = std::stod(en)*GeV;
29 if(isCompatibleWithSqrtS(end)) {
30 _ecms = en;
31 break;
32 }
33 }
34 if(_ecms.empty())
35 MSG_ERROR("Beam energy incompatible with analysis.");
36 }
37
38
39 /// Perform the per-event analysis
40 void analyze(const Event& event) {
41 const FinalState& fs = apply<FinalState>(event, "FS");
42
43 map<long,int> nCount;
44 int ntotal(0);
45 for (const Particle& p : fs.particles()) {
46 nCount[p.pid()] += 1;
47 ++ntotal;
48 }
49 // mu+mu- + photons
50 if(nCount[-13]==1 and nCount[13]==1 &&
51 ntotal==2+nCount[22])
52 _c_muons->fill(_ecms);
53 // everything else
54 else
55 _c_hadrons->fill(_ecms);
56 }
57
58
59 /// Normalise histograms etc., after the run
60 void finalize() {
61 BinnedEstimatePtr<string> mult;
62 book(mult,1,1,1);
63 divide(_c_hadrons, _c_muons, mult);
64 scale(_c_hadrons,crossSection()/ sumOfWeights() /nanobarn);
65 }
66
67 /// @}
68
69
70 /// @name Histograms
71 /// @{
72 BinnedHistoPtr<string> _c_hadrons, _c_muons;
73 string _ecms;
74 /// @}
75
76
77 };
78
79
80 RIVET_DECLARE_PLUGIN(MARKJ_1984_I196567);
81
82
83}
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