Rivet analyses referenceFENICE_1996_I426675Measurement of the hadronic cross section near the $N\bar{N}$ thresholdExperiment: FENICE (ADONE) Inspire ID: 426675 Status: VALIDATED Authors:
Beams: e- e+ Beam energies: ANY Run details:
Measurement of hadronic cross section in $e^+e^-$ collisions near the nucelon-antinucleon threshold by the FENICE experiment. Source code: FENICE_1996_I426675.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 FENICE_1996_I426675 : public Analysis {
10 public:
11
12 /// Constructor
13 RIVET_DEFAULT_ANALYSIS_CTOR(FENICE_1996_I426675);
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 }
27
28
29 /// Perform the per-event analysis
30 void analyze(const Event& event) {
31 const FinalState& fs = apply<FinalState>(event, "FS");
32
33 map<long,int> nCount;
34 int ntotal(0);
35 for (const Particle& p : fs.particles()) {
36 nCount[p.pid()] += 1;
37 ++ntotal;
38 }
39 // mu+mu- + photons
40 if(nCount[-13]==1 and nCount[13]==1 &&
41 ntotal==2+nCount[22])
42 vetoEvent;
43 _c_hadrons->fill();
44 }
45
46
47 /// Normalise histograms etc., after the run
48 void finalize() {
49 double fact = crossSection()/ sumOfWeights() /nanobarn;
50 double sig_h = _c_hadrons->val()*fact;
51 double err_h = _c_hadrons->err()*fact;
52 Estimate1DPtr hadrons;
53 book(hadrons, 1, 1, 1);
54 for (auto& b : hadrons->bins()) {
55 if (inRange(sqr(sqrtS()/GeV), b.xMin(), b.xMax())) {
56 b.set(sig_h, err_h);
57 }
58 }
59 }
60
61 /// @}
62
63
64 /// @name Histograms
65 /// @{
66 CounterPtr _c_hadrons;
67 /// @}
68
69
70 };
71
72
73 RIVET_DECLARE_PLUGIN(FENICE_1996_I426675);
74
75
76}
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