Rivet analyses referenceCMD2_2000_I523691Cross section for $e^+e^-\to \pi^+\pi^-\pi^0$ near the $\omega$ massExperiment: CMD2 (VEPP-2M) Inspire ID: 523691 Status: VALIDATED Authors:
Beam energies: ANY Run details:
Measurement of the cross section for $e^+e^-\to \pi^+\pi^-\pi^0$ for energies near the $\omega$ mass. Source code: CMD2_2000_I523691.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 CMD2_2000_I523691 : public Analysis {
11 public:
12
13 /// Constructor
14 RIVET_DEFAULT_ANALYSIS_CTOR(CMD2_2000_I523691);
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 /// Perform the per-event analysis
31 void analyze(const Event& event) {
32 const FinalState& fs = apply<FinalState>(event, "FS");
33
34 map<long,int> nCount;
35 int ntotal(0);
36 for (const Particle& p : fs.particles()) {
37 nCount[p.pid()] += 1;
38 ++ntotal;
39 }
40 if(ntotal!=3) vetoEvent;
41 if(nCount[-211]==1&&nCount[211]==1&&nCount[111]==1)
42 _num3pi->fill();
43 }
44
45
46 /// Normalise histograms etc., after the run
47 void finalize() {
48 double sigma = _num3pi->val();
49 double error = _num3pi->err();
50 sigma *= crossSection()/ sumOfWeights() /nanobarn;
51 error *= crossSection()/ sumOfWeights() /nanobarn;
52 Estimate1DPtr mult;
53 book(mult, 1, 1, 1);
54 for (auto& b : mult->bins()) {
55 if (inRange(sqrtS()/MeV, b.xMin(), b.xMax())) {
56 b.set(sigma, error);
57 }
58 }
59 }
60
61 /// @}
62
63
64 /// @name Histograms
65 /// @{
66 CounterPtr _num3pi;
67 /// @}
68
69
70 };
71
72
73 RIVET_DECLARE_PLUGIN(CMD2_2000_I523691);
74
75
76}
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