Rivet analyses referenceSND_2002_I582183Cross section for $e^+e^-\to \pi^+\pi^-\pi^0$ between 0.98 and 1.38 GeV.Experiment: SND (VEPP-2M) Inspire ID: 582183 Status: VALIDATED Authors:
Beam energies: ANY Run details:
Measurement of the cross section for $e^+e^-\to \pi^+\pi^-\pi^0$ by SND for energies between 0.98 and 1.38 GeV. Source code: SND_2002_I582183.cc 1// -*- C++ -*-
2#include "Rivet/Analysis.hh"
3#include "Rivet/Projections/FinalState.hh"
4
5
6namespace Rivet {
7
8
9 /// @brief Add a short analysis description here
10 class SND_2002_I582183 : public Analysis {
11 public:
12
13 /// Constructor
14 RIVET_DEFAULT_ANALYSIS_CTOR(SND_2002_I582183);
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, "TMP/num3");
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();
44
45 }
46
47
48 /// Normalise histograms etc., after the run
49 void finalize() {
50
51 double sigma = _num3pi->val();
52 double error = _num3pi->err();
53 sigma *= crossSection()/ sumOfWeights() /nanobarn;
54 error *= crossSection()/ sumOfWeights() /nanobarn;
55 Estimate1DPtr mult;
56 book(mult, 1, 1, 1);
57 for (auto& b : mult->bins()) {
58 if (inRange(sqrtS()/MeV, b.xMin(), b.xMax())) {
59 b.set(sigma, error);
60 }
61 }
62 }
63
64 /// @}
65
66
67 /// @name Histograms
68 /// @{
69 CounterPtr _num3pi;
70 /// @}
71
72
73 };
74
75
76 RIVET_DECLARE_PLUGIN(SND_2002_I582183);
77
78
79}
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