Rivet analyses referenceMUPI_1972_I84978Measurement of $R$ and the hadronic cross section for energies between 1.2 and 2.1 GeVExperiment: MUPI (ADONE) Inspire ID: 84978 Status: VALIDATED Authors:
Beam energies: (0.6, 0.6); (0.8, 0.8); (0.9, 0.9); (1.1, 1.1) GeV Run details:
Measurement of $R$ and the hadronic cross seection in $e^+e^-$ collisions by the Mu-Pi group for energies between 1.2 and 2.1 GeV. Beam energy must be specified as analysis option "ENERGY" when rivet-merging samples. Source code: MUPI_1972_I84978.cc 1// -*- C++ -*-
2#include "Rivet/Analysis.hh"
3#include "Rivet/Projections/FinalState.hh"
4
5namespace Rivet {
6
7
8 /// @brief e+e- R measurement
9 class MUPI_1972_I84978 : public Analysis {
10 public:
11
12 /// Constructor
13 RIVET_DEFAULT_ANALYSIS_CTOR(MUPI_1972_I84978);
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, 1, 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 const 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, 2, 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(MUPI_1972_I84978);
81
82
83}
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