Rivet analyses referenceCLEO_2007_I753556Measurement of $R$ for energies between 6.964 and 10.538 GeVExperiment: CLEO (CESR) Inspire ID: 753556 Status: VALIDATED Authors:
Beam energies: ANY Run details:
Measurement of $R$ in $e^+e^-$ collisions by CLEO for energies between 6.964 and 10.538 GeV. The individual 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: CLEO_2007_I753556.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 CLEO_2007_I753556 : public Analysis {
10 public:
11
12 /// Constructor
13 RIVET_DEFAULT_ANALYSIS_CTOR(CLEO_2007_I753556);
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
25 // Book histograms
26 book(_c_hadrons, "/TMP/sigma_hadrons");
27 book(_c_muons, "/TMP/sigma_muons");
28
29 }
30
31
32 /// Perform the per-event analysis
33 void analyze(const Event& event) {
34 const FinalState& fs = apply<FinalState>(event, "FS");
35
36 map<long,int> nCount;
37 int ntotal(0);
38 for (const Particle& p : fs.particles()) {
39 nCount[p.pid()] += 1;
40 ++ntotal;
41 }
42 // mu+mu- + photons
43 if(nCount[-13]==1 and nCount[13]==1 &&
44 ntotal==2+nCount[22])
45 _c_muons->fill();
46 // everything else
47 else
48 _c_hadrons->fill();
49 }
50
51
52 /// Normalise histograms etc., after the run
53 void finalize() {
54 Estimate0D R = *_c_hadrons/ *_c_muons;
55 double fact = crossSection()/ sumOfWeights() /picobarn;
56 double sig_h = _c_hadrons->val()*fact;
57 double err_h = _c_hadrons->err()*fact;
58 double sig_m = _c_muons ->val()*fact;
59 double err_m = _c_muons ->err()*fact;
60 Estimate1DPtr hadrons;
61 book(hadrons, "sigma_hadrons");
62 Estimate1DPtr muons;
63 book(muons, "sigma_muons" );
64 Estimate1DPtr mult;
65 book(mult, 1, 1, 1);
66 for (auto& b : mult->bins()) {
67 if (inRange(sqrtS()/GeV, b.xMin(), b.xMax())) {
68 b.set(R.val(), R.errPos());
69 hadrons->bin(b.index()).set(sig_h, err_h);
70 muons ->bin(b.index()).set(sig_m, err_m);
71 }
72 }
73 }
74
75 /// @}
76
77
78 /// @name Histograms
79 /// @{
80 CounterPtr _c_hadrons, _c_muons;
81 /// @}
82
83
84 };
85
86
87 RIVET_DECLARE_PLUGIN(CLEO_2007_I753556);
88
89
90}
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