Rivet analyses referenceKLOE_2005_I655225Cross section for $e^+e^-\to\pi^+\pi^-$ below 1 GeVExperiment: KLOE (DAPHNE) Inspire ID: 655225 Status: VALIDATED Authors:
Beam energies: (0.2, 0.2); (0.2, 0.2); (0.2, 0.2); (0.2, 0.2); (0.2, 0.2); (0.2, 0.2); (0.2, 0.2); (0.2, 0.2); (0.2, 0.2); (0.2, 0.2); (0.2, 0.2); (0.2, 0.2); (0.2, 0.2); (0.2, 0.2); (0.2, 0.2); (0.2, 0.2); (0.3, 0.3); (0.3, 0.3); (0.3, 0.3); (0.3, 0.3); (0.3, 0.3); (0.3, 0.3); (0.3, 0.3); (0.3, 0.3); (0.3, 0.3); (0.3, 0.3); (0.3, 0.3); (0.3, 0.3); (0.3, 0.3); (0.3, 0.3); (0.3, 0.3); (0.3, 0.3); (0.3, 0.3); (0.3, 0.3); (0.3, 0.3); (0.3, 0.3); (0.4, 0.4); (0.4, 0.4); (0.4, 0.4); (0.4, 0.4); (0.4, 0.4); (0.4, 0.4); (0.4, 0.4); (0.4, 0.4); (0.4, 0.4); (0.4, 0.4); (0.4, 0.4); (0.4, 0.4); (0.4, 0.4); (0.4, 0.4); (0.4, 0.4); (0.4, 0.4); (0.4, 0.4); (0.4, 0.4); (0.4, 0.4); (0.5, 0.5); (0.5, 0.5); (0.5, 0.5); (0.5, 0.5); (0.5, 0.5) GeV Run details:
Measurement of the cross section for $e^+e^-\to\pi^+\pi^-$ below 1 GeV Source code: KLOE_2005_I655225.cc 1// -*- C++ -*-
2#include "Rivet/Analysis.hh"
3#include "Rivet/Projections/FinalState.hh"
4
5namespace Rivet {
6
7
8 /// @brief e+e- > pi+pi-
9 class KLOE_2005_I655225 : public Analysis {
10 public:
11
12 /// Constructor
13 RIVET_DEFAULT_ANALYSIS_CTOR(KLOE_2005_I655225);
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 // Book histograms
24 book(_npion, 2, 1, 1);
25 for (const string& en : _npion.binning().edges<0>()) {
26 double end = sqrt(std::stod(en))*GeV;
27 if(isCompatibleWithSqrtS(end)) {
28 _ecms = en;
29 break;
30 }
31 }
32 if(_ecms.empty()) MSG_ERROR("Beam energy incompatible with analysis.");
33 }
34
35
36 /// Perform the per-event analysis
37 void analyze(const Event& event) {
38 const FinalState& fs = apply<FinalState>(event, "FS");
39 if(fs.particles().size()!=2) vetoEvent;
40 for (const Particle& p : fs.particles()) {
41 if(abs(p.pid())!=PID::PIPLUS) vetoEvent;
42 }
43 _npion->fill(_ecms);
44 }
45
46
47 /// Normalise histograms etc., after the run
48 void finalize() {
49 scale(_npion,crossSection()/ sumOfWeights() /nanobarn);
50 }
51
52 /// @}
53
54
55 /// @name Histograms
56 /// @{
57 BinnedHistoPtr<string> _npion;
58 string _ecms;
59 /// @}
60
61
62 };
63
64
65 RIVET_DECLARE_PLUGIN(KLOE_2005_I655225);
66
67
68}
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