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: ANY 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 Add a short analysis description here
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");
24 book(_c_muons, "/TMP/sigma_muons");
25 }
26
27
28 /// Perform the per-event analysis
29 void analyze(const Event& event) {
30 const FinalState& fs = apply<FinalState>(event, "FS");
31
32 map<long,int> nCount;
33 int ntotal(0);
34 for (const Particle& p : fs.particles()) {
35 nCount[p.pid()] += 1;
36 ++ntotal;
37 }
38 // mu+mu- + photons
39 if(nCount[-13]==1 and nCount[13]==1 &&
40 ntotal==2+nCount[22])
41 _c_muons->fill();
42 // everything else
43 else
44 _c_hadrons->fill();
45 }
46
47
48 /// Normalise histograms etc., after the run
49 void finalize() {
50 // R
51 Estimate0D R = *_c_hadrons/ *_c_muons;
52 double fact = crossSection()/ sumOfWeights() /nanobarn;
53 double sig_h = _c_hadrons->val()*fact;
54 double err_h = _c_hadrons->err()*fact;
55 double sig_m = _c_muons ->val()*fact;
56 double err_m = _c_muons ->err()*fact;
57 Estimate1DPtr hadrons;
58 book(hadrons, "simga_hadrons");
59 Estimate1DPtr muons;
60 book(muons, "sigma_muons");
61 Estimate1DPtr mult1;
62 book(mult1, 1,1,1);
63 Estimate1DPtr mult2;
64 book(mult2, 2,1,1);
65 for (auto& b : mult1->bins()) {
66 if (inRange(sqrtS()/GeV, 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(MARKI_1977_I119979);
88
89
90}
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