Cross section measurements of $e^{+}{e}^{-}\to K^{+}{K}^{-}{K}^{+}{K}^{-}$ and $\ddot{I}•K^{+}{K}^{-}$ at center-of-mass energies from 2.10 to 3.08 GeV

Abstract

We measure the Born cross sections of the process $e^{+}{e}^{-}\to K^{+}{K}^{-}{K}^{+}{K}^{-}$ at center-of-mass (c.m.) energies, $\sqrt{s}$, between 2.100 and 3.080 GeV. The data were collected using the BESIII detector at the BEPCII collider. An enhancement at $\sqrt{s}=2.232$ GeV is observed, very close to the $e^{+}{e}^{-}\to \hat{I}›\overline{\hat{I}}›$ production threshold. A similar enhancement at the same c.m. energy is observed in the $e^{+}{e}^{-}\to \ddot{I}•K^{+}{K}^{-}$ cross section. The energy dependence of the $K^{+}{K}^{-}{K}^{+}{K}^{-}$ and $\ddot{I}•K^{+}{K}^{-}$ cross sections differs significantly from that of $e^{+}{e}^{-}\to \ddot{I}•\ddot{I}{€}^{+}\ddot{I}{€}^{-}$.