Rivet analyses referenceMARKI_1977_I119979Measurement of $R$ for energies between 3.598 and 3.886 GeVExperiment: MARKI (Spear) Inspire ID: 119979 Status: VALIDATED Authors:
Beam energies: (1.8, 1.8); (1.8, 1.8); (1.9, 1.9); (1.9, 1.9); (1.9, 1.9); (1.9, 1.9); (1.9, 1.9); (1.9, 1.9); (1.9, 1.9); (1.9, 1.9); (1.9, 1.9); (1.9, 1.9); (1.9, 1.9); (1.9, 1.9); (1.9, 1.9); (1.9, 1.9); (1.9, 1.9); (1.9, 1.9); (1.9, 1.9); (1.9, 1.9); (1.9, 1.9) GeV Run details:
Measurement of $R$ and the hadronic cross section for energies between 3.598 and 3.886 GeV. The hadronic and muonic cross sections are also outputted to the yoda file so that ratio $R$ can be recalcuated if runs are combined. Source code: MARKI_1977_I119979.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 MARKI_1977_I119979 : public Analysis {
10 public:
11
12 /// Constructor
13 RIVET_DEFAULT_ANALYSIS_CTOR(MARKI_1977_I119979);
14
15
16 /// @name Analysis methods
17 /// @{
18
19 /// Book histograms and initialise projections before the run
20 void init() {
21 declare(FinalState(), "FS");
22 // Book histograms
23 book(_c_hadrons, "/TMP/sigma_hadrons", refData<YODA::BinnedEstimate<string>>(1,1,1));
24 book(_c_muons, "/TMP/sigma_muons" , refData<YODA::BinnedEstimate<string>>(1,1,1));
25 for (const string& en : _c_hadrons.binning().edges<0>()) {
26 double end = std::stod(en)*GeV;
27 if(isCompatibleWithSqrtS(end)) {
28 _ecms = en;
29 break;
30 }
31 }
32 if(_ecms.empty()) MSG_ERROR("Beam energy incompatible with analysis.");
33 }
34
35
36 /// Perform the per-event analysis
37 void analyze(const Event& event) {
38 const FinalState& fs = apply<FinalState>(event, "FS");
39
40 map<long,int> nCount;
41 int ntotal(0);
42 for (const Particle& p : fs.particles()) {
43 nCount[p.pid()] += 1;
44 ++ntotal;
45 }
46 // mu+mu- + photons
47 if(nCount[-13]==1 and nCount[13]==1 &&
48 ntotal==2+nCount[22])
49 _c_muons->fill(_ecms);
50 // everything else
51 else
52 _c_hadrons->fill(_ecms);
53 }
54
55
56 /// Normalise histograms etc., after the run
57 void finalize() {
58 BinnedEstimatePtr<string> mult;
59 book(mult, 1, 1, 1);
60 divide(_c_hadrons,_c_muons,mult);
61 book(mult, 2, 1, 1);
62 divide(_c_hadrons,_c_muons,mult);
63 }
64
65 /// @}
66
67
68 /// @name Histograms
69 /// @{
70 BinnedHistoPtr<string> _c_hadrons, _c_muons;
71 string _ecms;
72 /// @}
73
74
75 };
76
77
78 RIVET_DECLARE_PLUGIN(MARKI_1977_I119979);
79
80
81}
|