Rivet analyses referencePLUTO_1977_I110272Measurement of $R$ for energies between 3.1 and 4.8 GeVExperiment: PLUTO (DORIS) Inspire ID: 110272 Status: VALIDATED Authors:
Beam energies: ANY Run details:
Measurement of $R$ in $e^+e^-$ collisions by PLUTO for energies between 3.1 and 4.8 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: PLUTO_1977_I110272.cc 1// -*- C++ -*-
2#include "Rivet/Analysis.hh"
3#include "Rivet/Projections/FinalState.hh"
4
5namespace Rivet {
6
7
8 /// @brief R for energies between 3.1 and 4.8 GeV
9 class PLUTO_1977_I110272 : public Analysis {
10 public:
11
12 /// Constructor
13 RIVET_DEFAULT_ANALYSIS_CTOR(PLUTO_1977_I110272);
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,"/TMP/sigma_hadrons");
26 book(_c_muons ,"/TMP/sigma_muons");
27
28 }
29
30
31 /// Perform the per-event analysis
32 void analyze(const Event& event) {
33 const FinalState& fs = apply<FinalState>(event, "FS");
34
35 map<long,int> nCount;
36 int ntotal(0);
37 for (const Particle& p : fs.particles()) {
38 nCount[p.pid()] += 1;
39 ++ntotal;
40 }
41 // mu+mu- + photons
42 if(nCount[-13]==1 and nCount[13]==1 &&
43 ntotal==2+nCount[22])
44 _c_muons->fill();
45 // everything else
46 else
47 _c_hadrons->fill();
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, 2, 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(PLUTO_1977_I110272);
87
88
89}
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