Rivet analyses referenceCELLO_1987_I236981Measurement of $R$ for energies between 14 and 46.6 GeVExperiment: CELLO (PETRA) Inspire ID: 236981 Status: VALIDATED Authors:
Beam energies: ANY Run details:
Measurement of $R$ in $e^+e^-$ collisions for energies between 14 and 46.6 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: CELLO_1987_I236981.cc 1// -*- C++ -*-
2#include "Rivet/Analysis.hh"
3#include "Rivet/Projections/FinalState.hh"
4
5namespace Rivet {
6
7
8 /// @brief Add a short analysis description here
9 class CELLO_1987_I236981 : public Analysis {
10 public:
11
12 /// Constructor
13 RIVET_DEFAULT_ANALYSIS_CTOR(CELLO_1987_I236981);
14
15
16 /// @name Analysis methods
17 /// @{
18
19 /// Book histograms and initialise projections before the run
20 void init() {
21
22 // Initialise and register projections
23 declare(FinalState(), "FS");
24 // counters for R
25 book(_c_hadrons, "/TMP/sigma_hadrons");
26 book(_c_muons, "/TMP/sigma_muons");
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();
44 // everything else
45 else {
46 _c_hadrons->fill();
47 }
48 }
49
50
51 /// Normalise histograms etc., after the run
52 void finalize() {
53 Estimate0D R = *_c_hadrons/ *_c_muons;
54 double fact = crossSection()/ sumOfWeights() /picobarn;
55 double sig_h = _c_hadrons->val()*fact;
56 double err_h = _c_hadrons->err()*fact;
57 double sig_m = _c_muons ->val()*fact;
58 double err_m = _c_muons ->err()*fact;
59 Estimate1DPtr hadrons;
60 book(hadrons, "sigma_hadrons");
61 Estimate1DPtr muons;
62 book(muons, "sigma_muons" );
63 Estimate1DPtr mult;
64 book(mult, 1, 1, 1);
65 for (auto& b : mult->bins()) {
66 if (inRange(sqrtS()/GeV, b.xMin(), b.xMax())) {
67 b.set(R.val(), R.errPos());
68 hadrons->bin(b.index()).set(sig_h, err_h);
69 muons ->bin(b.index()).set(sig_m, err_m);
70 }
71 }
72 }
73
74 /// @}
75
76
77 /// @name Histograms
78 /// @{
79 CounterPtr _c_hadrons, _c_muons;
80 /// @}
81
82
83 };
84
85
86 RIVET_DECLARE_PLUGIN(CELLO_1987_I236981);
87
88
89}
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