Rivet analyses referenceVENUS_1987_I251274Measurement of $R$ for energies between 50 and 52 GeVExperiment: VENUS (Tristan) Inspire ID: 251274 Status: VALIDATED Authors:
Beam energies: (25.0, 25.0); (26.0, 26.0) GeV Run details:
Measurement of $R$ in $e^+e^-$ collisions by VENUS for energies between 50 and 52 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: VENUS_1987_I251274.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 VENUS_1987_I251274 : public Analysis {
10 public:
11
12 /// Constructor
13 RIVET_DEFAULT_ANALYSIS_CTOR(VENUS_1987_I251274);
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_hadrons", refData<YODA::BinnedEstimate<int>>(1,1,1));
26 book(_c_muons, "/TMP/sigma_muons" , refData<YODA::BinnedEstimate<int>>(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 &&
42 ntotal==2+nCount[22])
43 _c_muons->fill(round(sqrtS()/GeV));
44 // everything else
45 else
46 _c_hadrons->fill(round(sqrtS()/GeV));
47 }
48
49
50 /// Normalise histograms etc., after the run
51 void finalize() {
52 BinnedEstimatePtr<int> mult;
53 book(mult, 1, 1, 1);
54 divide(_c_hadrons,_c_muons,mult);
55 }
56
57 /// @}
58
59
60 /// @name Histograms
61 /// @{
62 BinnedHistoPtr<int> _c_hadrons, _c_muons;
63 /// @}
64
65
66 };
67
68
69 RIVET_DECLARE_PLUGIN(VENUS_1987_I251274);
70
71
72}
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