Rivet analyses referenceCRYSTAL_BALL_1988_I261078Measurement of $R$ for energies between 9.39 GeVExperiment: CRYSTAL_BALL (DORIS) Inspire ID: 261078 Status: VALIDATED Authors:
Beam energies: (4.7, 4.7) GeV Run details:
Measurement of $R$ in $e^+e^-$ collisions by the Crystal Ball experiment for 9.39 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: CRYSTAL_BALL_1988_I261078.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 CRYSTAL_BALL_1988_I261078 : public Analysis {
10 public:
11
12 /// Constructor
13 RIVET_DEFAULT_ANALYSIS_CTOR(CRYSTAL_BALL_1988_I261078);
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 if (nCount[-13]==1 and nCount[13]==1 && ntotal==2+nCount[22]) {
41 _c_muons->fill(Ecm); // mu+mu- + photons
42 }
43 else {
44 _c_hadrons->fill(Ecm); // everything else
45 }
46 }
47
48
49 /// Normalise histograms etc., after the run
50 void finalize() {
51 const double fact = crossSection()/ sumOfWeights() /picobarn;
52 scale( {_c_hadrons, _c_muons}, fact);
53 BinnedEstimatePtr<string> mult;
54 book(mult,1,1,1);
55 divide(_c_hadrons, _c_muons, mult);
56 }
57 /// @}
58
59
60 /// @name Histograms
61 /// @{
62 BinnedHistoPtr<string> _c_hadrons, _c_muons;
63 const string Ecm = "9.39";
64 /// @}
65
66
67 };
68
69
70 RIVET_DECLARE_PLUGIN(CRYSTAL_BALL_1988_I261078);
71
72
73}
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