Rivet analyses referenceDM2_1991_I318558Cross section for $e^+e^-\to$ $K^+K^-\pi^0$ and $K^0_SK^\pm\pi^\mp$ for energies from 1.3 to 2.2 GeVExperiment: DM2 (DCI) Inspire ID: 318558 Status: VALIDATED Authors:
Beam energies: ANY Run details:
Measurement of the cross section for $e^+e^-\to$ $K^+K^-\pi^0$ and $K^0_SK^\pm\pi^\mp$ for energies from 1.3 to 2.2 GeV. Source code: DM2_1991_I318558.cc 1// -*- C++ -*-
2#include "Rivet/Analysis.hh"
3#include "Rivet/Projections/FinalState.hh"
4
5namespace Rivet {
6
7
8 /// @brief e+e- -> K+K-pi0 and KS0 K+-pi-+
9 class DM2_1991_I318558 : public Analysis {
10 public:
11
12 /// Constructor
13 RIVET_DEFAULT_ANALYSIS_CTOR(DM2_1991_I318558);
14
15
16 /// @name Analysis methods
17 /// @{
18
19 /// Book histograms and initialise projections before the run
20 void init() {
21
22 // Initialise and register projections
23 declare(FinalState(), "FS");
24 // Book histograms
25 for (unsigned int ix=0;ix<2;++ix) {
26 book(_nMeson[ix], ix+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[310]==1 &&
43 ((nCount[ 211]==1&&nCount[-321]==1)||
44 (nCount[-211]==1&&nCount[ 321]==1)))
45 _nMeson[0]->fill(round(sqrtS()/MeV));
46 else if(nCount[321]==1 &&
47 nCount[-321]==1 && nCount[111]==1)
48 _nMeson[1]->fill(round(sqrtS()/MeV));
49 }
50
51
52 /// Normalise histograms etc., after the run
53 void finalize() {
54 for (unsigned int ix=0;ix<2;++ix) {
55 scale(_nMeson[ix], crossSection()/ sumOfWeights() /nanobarn);
56 }
57 }
58
59 /// @}
60
61
62 /// @name Histograms
63 /// @{
64 BinnedHistoPtr<int> _nMeson[2];
65 /// @}
66
67
68 };
69
70
71 RIVET_DECLARE_PLUGIN(DM2_1991_I318558);
72
73
74}
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