Rivet analyses
Cross section for e+e−→ KS0KL0between2.00 and 3.08 GeV
Experiment: BESIII (BEPC)
Inspire ID: 1866051
Status: VALIDATED
Authors: - Peter Richardson
References: - arXiv: 2105.13597
Beams: e+ e-
Beam energies: (1.0, 1.0); (1.0, 1.0); (1.1, 1.1); (1.1, 1.1); (1.1, 1.1); (1.1, 1.1); (1.1, 1.1); (1.1, 1.1); (1.2, 1.2); (1.2, 1.2); (1.2, 1.2); (1.3, 1.3); (1.3, 1.3); (1.4, 1.4); (1.5, 1.5)GeV
Run details: - e+e- to hadrons
Measurement of the cross section for e+e−→ KS0KL0 for energies between 2.00 and 3.08 GeV.
Source
code:BESIII_2021_I1866051.cc
// -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/FinalState.hh"
namespace Rivet {
/// @brief e+e- > K0K0
class BESIII_2021_I1866051 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(BESIII_2021_I1866051);
/// @name Analysis methods
///@{
/// Book histograms and initialise projections before the run
void init() {
// Initialise and register projections
declare(FinalState(), "FS");
// Book histograms
book(_nKSKL, 1, 1, 1);
for (const string& en : _nKSKL.binning().edges<0>()) {
const double end = stod(en)*GeV;
if (isCompatibleWithSqrtS(end)) {
_sqs = en; break;
}
}
raiseBeamErrorIf(_sqs.empty());
}
/// Perform the per-event analysis
void analyze(const Event& event) {
const FinalState& fs = apply<FinalState>(event, "FS");
map<long,int> nCount;
int ntotal(0);
for (const Particle& p : fs.particles()) {
nCount[p.pid()] += 1;
++ntotal;
}
if (ntotal==2 && nCount[130]==1 && nCount[310]==1) {
_nKSKL->fill(_sqs);
}
}
/// Normalise histograms etc., after the run
void finalize() {
scale(_nKSKL, crossSection()/ sumOfWeights() /picobarn);
}
///@}
/// @name Histograms
///@{
BinnedHistoPtr<string> _nKSKL;
string _sqs = "";
///@}
};
RIVET_DECLARE_PLUGIN(BESIII_2021_I1866051);
}