Rivet analyses referenceDM1_1982_I176801Cross section for $e^+e^-\to K^0_SK^\pm\pi^\mp$ for energies from 1.4 to 2.1 GeVExperiment: DM1 (DCI) Inspire ID: 176801 Status: VALIDATED Authors:
Beam energies: ANY Run details:
Measurement of the cross section for $e^+e^-\to$ ^0_SK^\pm\pi^\mp$ for energies from 1.4 to 2.`x GeV. Source code: DM1_1982_I176801.cc 1// -*- C++ -*-
2#include "Rivet/Analysis.hh"
3#include "Rivet/Projections/FinalState.hh"
4
5namespace Rivet {
6
7
8 /// @brief Add a short analysis description here
9 class DM1_1982_I176801 : public Analysis {
10 public:
11
12 /// Constructor
13 RIVET_DEFAULT_ANALYSIS_CTOR(DM1_1982_I176801);
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(_nKKpi, "/TMP/nKKpi");
24
25 }
26
27
28 /// Perform the per-event analysis
29 void analyze(const Event& event) {
30 const FinalState& fs = apply<FinalState>(event, "FS");
31
32 map<long,int> nCount;
33 int ntotal(0);
34 for (const Particle& p : fs.particles()) {
35 nCount[p.pid()] += 1;
36 ++ntotal;
37 }
38 if(ntotal!=3) vetoEvent;
39 if(nCount[310]==1 &&
40 ((nCount[ 211]==1&&nCount[-321]==1)||
41 (nCount[-211]==1&&nCount[ 321]==1)))
42 _nKKpi->fill();
43 }
44
45
46 /// Normalise histograms etc., after the run
47 void finalize() {
48 double sigma = _nKKpi->val();
49 double error = _nKKpi->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 _nKKpi;
67 /// @}
68
69
70 };
71
72
73 RIVET_DECLARE_PLUGIN(DM1_1982_I176801);
74
75
76}
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