Study of the process $e^{+}{e}^{-}\to K^{+}{K}^{-}$ in the center-of-mass energy range 1010--1060~MeV with the CMD-3 detector

Abstract

The process $e^{+}{e}^{-}\to K^{+}{K}^{-}$ has been studied using $1.7\times 10^6$ events from a data sample corresponding to an integrated luminosity of 5.7 pb${}^{-1}$ collected with the CMD-3 detector in the center-of-mass energy range 1010--1060 MeV. The cross section measured with an about 2\% systematic uncertainty and it is used to calculate the contribution to the anomalous magnetic moment of the muon $a_{\hat{I}}{¼}^{K^{+}{K}^{-}}=(19.33\pm 0.40)\times 10^{-10}$, and to obtain the $\ddot{I}•(1020)$ meson parameters. We consider the relationship between the $e^{+}{e}^{-}\to K^{+}{K}^{-}$ and $e^{+}{e}^{-}\to K_S^0{K}_L^0$ cross sections and compare it to the theoretical expectations.