Cross section measurement of $e^{+}{e}^{-}\to K_S^0{K}_L^0$ at $\sqrt{s}=2.00-3.08\mathrm{GeV}$

Abstract

The cross sections of the process $e^{+}{e}^{-}\to K_S^0{K}_L^0$ are measured at fifteen center-of-mass energies $\sqrt{s}$ from $2.00$ to $3.08\mathrm{GeV}$ with the BESIII detector at the Beijing Electron Positron Collider (BEPCII). The results are found to be consistent with those obtained by BaBar. A resonant structure around $2.2\mathrm{GeV}$ is observed, with a mass and width of $2273.7\pm 5.7\pm 19.3\mathrm{MeV}/c^2$ and $86\pm 44\pm 51\mathrm{MeV}$, respectively, where the first uncertainties are statistical and the second ones are systematic. The product of its radiative width (${\Gamma }_{e^{+}{e}^{-}}$) with its branching fraction to $K_S^0{K}_L^0$ ($B{r}_{K_S^0{K}_L^0}$) is $0.9\pm 0.6\pm 0.7\mathrm{eV}$.

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