Rivet analyses referencePLUTO_1977_I110272Measurement of $R$ for energies between 3.1 and 4.8 GeVExperiment: PLUTO (DORIS) Inspire ID: 110272 Status: VALIDATED Authors:
Beam energies: (1.8, 1.8); (1.8, 1.8); (1.8, 1.8); (2.0, 2.0); (2.0, 2.0); (2.0, 2.0); (2.0, 2.0); (2.0, 2.0); (2.0, 2.0); (2.0, 2.0); (2.0, 2.0); (2.1, 2.1); (2.1, 2.1); (2.1, 2.1); (2.1, 2.1); (2.1, 2.1); (2.1, 2.1); (2.1, 2.1); (2.1, 2.1); (2.2, 2.2); (2.2, 2.2); (2.2, 2.2); (2.2, 2.2); (2.2, 2.2); (2.2, 2.2); (2.8, 2.8); (2.3, 2.3); (2.4, 2.4) GeV Run details:
Measurement of $R$ in $e^+e^-$ collisions by PLUTO for energies between 3.1 and 4.8 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: PLUTO_1977_I110272.cc 1// -*- C++ -*-
2#include "Rivet/Analysis.hh"
3#include "Rivet/Projections/FinalState.hh"
4
5namespace Rivet {
6
7
8 /// @brief R for energies between 3.1 and 4.8 GeV
9 class PLUTO_1977_I110272 : public Analysis {
10 public:
11
12 /// Constructor
13 RIVET_DEFAULT_ANALYSIS_CTOR(PLUTO_1977_I110272);
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<string>>(2,1,1));
26 book(_c_muons, "/TMP/sigma_muons" , refData<YODA::BinnedEstimate<string>>(2,1,1));
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()) MSG_ERROR("Beam energy incompatible with analysis.");
35
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, 2, 1, 1);
63 divide(_c_hadrons,_c_muons,mult);
64 }
65
66 /// @}
67
68
69 /// @name Histograms
70 /// @{
71 BinnedHistoPtr<string> _c_hadrons, _c_muons;
72 string _ecms;
73 /// @}
74
75
76 };
77
78
79 RIVET_DECLARE_PLUGIN(PLUTO_1977_I110272);
80
81
82}
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