Rivet analyses referenceDM1_1981_I156053Cross section for $e^+e^-\to K^0_SK^0_L$ between 1.4 and 2.18 GeVExperiment: DM1 (DCI) Inspire ID: 156053 Status: VALIDATED Authors:
Beam energies: ANY Run details:
Measurement of the cross section for $e^+e^-\to K^+K^-$ at energies between 1.35 and 2.4 GeV Source code: DM1_1981_I156053.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_1981_I156053 : public Analysis {
10 public:
11
12 /// Constructor
13 RIVET_DEFAULT_ANALYSIS_CTOR(DM1_1981_I156053);
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
25 // Book histograms
26 book(_nKSKL, "TMP/nKSKL");
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
41 if(ntotal==2 && nCount[130]==1 && nCount[310]==1)
42 _nKSKL->fill();
43 }
44
45
46 /// Normalise histograms etc., after the run
47 void finalize() {
48 double sigma = _nKSKL->val();
49 double error = _nKSKL->err();
50 sigma *= crossSection()/ sumOfWeights() /nanobarn;
51 error *= crossSection()/ sumOfWeights() /nanobarn;
52 Scatter2D temphisto(refData(1, 1, 1));
53 Scatter2DPtr mult;
54 book(mult, 1, 1, 1);
55 for (size_t b = 0; b < temphisto.numPoints(); b++) {
56 const double x = temphisto.point(b).x();
57 pair<double,double> ex = temphisto.point(b).xErrs();
58 pair<double,double> ex2 = ex;
59 if(ex2.first ==0.) ex2. first=0.0001;
60 if(ex2.second==0.) ex2.second=0.0001;
61 if (inRange(sqrtS()/GeV, x-ex2.first, x+ex2.second)) {
62 mult->addPoint(x, sigma, ex, make_pair(error,error));
63 }
64 else {
65 mult->addPoint(x, 0., ex, make_pair(0.,.0));
66 }
67 }
68 }
69
70 //@}
71
72
73 /// @name Histograms
74 //@{
75 CounterPtr _nKSKL;
76 //@}
77
78
79 };
80
81
82 // The hook for the plugin system
83 RIVET_DECLARE_PLUGIN(DM1_1981_I156053);
84
85
86}
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