Rivet analyses referenceKEDR_2019_I1673357Measurement of $R$ between 1.84 and 3.72 GeVExperiment: KEDR (VEPP-4M) Inspire ID: 1673357 Status: VALIDATED Authors:
Beam energies: ANY Run details:
Measurement of $R$ for centre-of-mass energies between 1.84 and 3.72 GeV by the KEDR experiment. Source code: KEDR_2019_I1673357.cc 1// -*- C++ -*-
2#include "Rivet/Analysis.hh"
3#include "Rivet/Projections/FinalState.hh"
4
5namespace Rivet {
6
7
8 /// @brief Measurement of R
9 class KEDR_2019_I1673357 : public Analysis {
10 public:
11
12 /// Constructor
13 RIVET_DEFAULT_ANALYSIS_CTOR(KEDR_2019_I1673357);
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 /// 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 /// Normalise histograms etc., after the run
51 void finalize() {
52 Estimate0D R = *_c_hadrons/ *_c_muons;
53 double fact = crossSection()/ sumOfWeights() /picobarn;
54 double sig_h = _c_hadrons->val()*fact;
55 double err_h = _c_hadrons->err()*fact;
56 double sig_m = _c_muons ->val()*fact;
57 double err_m = _c_muons ->err()*fact;
58 Estimate1DPtr hadrons;
59 book(hadrons, "sigma_hadrons");
60 Estimate1DPtr muons;
61 book(muons, "sigma_muons" );
62 Estimate1DPtr mult1,mult2;
63 book(mult1, 1, 1, 1);
64 book(mult2, 1, 1, 2);
65 for (auto& b : mult1->bins()) {
66 if (inRange(sqrtS()/MeV, b.xMin(), b.xMax())) {
67 b.set(R.val(), R.errPos());
68 mult2->bin(b.index()).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(KEDR_2019_I1673357);
88
89}
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