Rivet analyses referenceSND_1999_I508003Cross section for $e^+e^-\to \pi^+\pi^-\pi^0$ between 1.04 and 1.38 GeV.Experiment: SND (VEPP-2M) Inspire ID: 508003 Status: VALIDATED Authors:
Beam energies: (0.5, 0.5); (0.5, 0.5); (0.5, 0.5); (0.5, 0.5); (0.5, 0.5); (0.5, 0.5); (0.6, 0.6); (0.6, 0.6); (0.6, 0.6); (0.6, 0.6); (0.6, 0.6); (0.6, 0.6); (0.6, 0.6); (0.6, 0.6); (0.6, 0.6); (0.6, 0.6); (0.6, 0.6); (0.6, 0.6); (0.6, 0.6); (0.6, 0.6); (0.6, 0.6); (0.6, 0.6); (0.6, 0.6); (0.6, 0.6); (0.6, 0.6); (0.7, 0.7); (0.7, 0.7); (0.7, 0.7); (0.7, 0.7); (0.7, 0.7); (0.7, 0.7); (0.7, 0.7); (0.7, 0.7); (0.7, 0.7) GeV Run details:
Measurement of the cross section for $e^+e^-\to \pi^+\pi^-\pi^0$ by SND for energies between 1.04 and 1.38 GeV. Beam energy must be specified as analysis option "ENERGY" when rivet-merging samples. Source code: SND_1999_I508003.cc 1// -*- C++ -*-
2#include "Rivet/Analysis.hh"
3#include "Rivet/Projections/FinalState.hh"
4
5
6namespace Rivet {
7
8
9 /// @brief e+e- -> pi+pi-pi0
10 class SND_1999_I508003 : public Analysis {
11 public:
12
13 /// Constructor
14 RIVET_DEFAULT_ANALYSIS_CTOR(SND_1999_I508003);
15
16
17 /// @name Analysis methods
18 /// @{
19
20 /// Book histograms and initialise projections before the run
21 void init() {
22
23 // Initialise and register projections
24 declare(FinalState(), "FS");
25
26 book(_num3pi, 1, 1, 1);
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 if(ntotal!=3) vetoEvent;
42 if(nCount[-211]==1&&nCount[211]==1&&nCount[111]==1)
43 _num3pi->fill(round(sqrtS()/MeV));
44
45 }
46
47
48 /// Normalise histograms etc., after the run
49 void finalize() {
50 scale(_num3pi, crossSection()/ sumOfWeights() /nanobarn);
51 }
52
53 /// @}
54
55
56 /// @name Histograms
57 /// @{
58 BinnedHistoPtr<int> _num3pi;
59 /// @}
60
61
62 };
63
64
65 RIVET_DECLARE_PLUGIN(SND_1999_I508003);
66
67
68}
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