Cross section measurement of e(+)e(-) -> (KSKL0)-K-0 at root s=2.00-3.08 GeV

Abstract

The cross sections of the process e+e-→KS0KL0 are measured at fifteen center-of-mass energies s from 2.00 to 3.08 GeV with a total integrated luminosity of 582 pb-1 and using the BESIII detector at the Beijing Electron Positron Collider. The results are found to be consistent with those obtained by BABAR. A resonant structure around 2.2 GeV is observed, with a mass and width of 2273.7±5.7±19.3 MeV/c2 and 86±44±51 MeV, respectively, where the first uncertainties are statistical and the second ones are systematic. The product of its radiative width (Γe+e-) with its branching fraction to KS0KL0 (BrKS0KL0) is 0.9±0.6±0.7 eV. © 2021 authors. Published by the American Physical Society.