Rivet analyses referenceSND_2018_I1637194Cross section for $e^+e^-\to$ $K^0_SK^0_L\pi^0$ for energies between 1.3 and 2.0Experiment: SND (VEPP-2M) Inspire ID: 1637194 Status: VALIDATED Authors:
Beam energies: ANY Run details:
Measurement of the cross section for $e^+e^-\to$ $K^0_SK^0_L\pi^0$ for energies from 1.3 to 2.0 GeV. Source code: SND_2018_I1637194.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 SND_2018_I1637194 : public Analysis {
10 public:
11
12 /// Constructor
13 RIVET_DEFAULT_ANALYSIS_CTOR(SND_2018_I1637194);
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 /// Perform the per-event analysis
28 void analyze(const Event& event) {
29 const FinalState& fs = apply<FinalState>(event, "FS");
30
31 map<long,int> nCount;
32 int ntotal(0);
33 for (const Particle& p : fs.particles()) {
34 nCount[p.pid()] += 1;
35 ++ntotal;
36 }
37
38 if(ntotal==3 && nCount[130]==1 && nCount[310]==1 && nCount[111] ==1)
39 _nKKpi->fill();
40 }
41
42
43 /// Normalise histograms etc., after the run
44 void finalize() {
45 double sigma = _nKKpi->val();
46 double error = _nKKpi->err();
47 sigma *= crossSection()/ sumOfWeights() /nanobarn;
48 error *= crossSection()/ sumOfWeights() /nanobarn;
49 Scatter2D temphisto(refData(1, 1, 1));
50 Scatter2DPtr mult;
51 book(mult, 1, 1, 1);
52 for (size_t b = 0; b < temphisto.numPoints(); b++) {
53 const double x = temphisto.point(b).x();
54 pair<double,double> ex = temphisto.point(b).xErrs();
55 pair<double,double> ex2 = ex;
56 if(ex2.first ==0.) ex2. first=0.0001;
57 if(ex2.second==0.) ex2.second=0.0001;
58 if (inRange(sqrtS()/GeV, x-ex2.first, x+ex2.second)) {
59 mult->addPoint(x, sigma, ex, make_pair(error,error));
60 }
61 else {
62 mult->addPoint(x, 0., ex, make_pair(0.,.0));
63 }
64 }
65 }
66
67 //@}
68
69
70 /// @name Histograms
71 //@{
72 CounterPtr _nKKpi;
73 //@}
74
75
76 };
77
78
79 // The hook for the plugin system
80 RIVET_DECLARE_PLUGIN(SND_2018_I1637194);
81
82
83}
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