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

TL;DR

This study precisely measures the $e^+e^- o K^+K^-$ cross section in the 1010--1060 MeV range using the CMD-3 detector, providing insights into the muon magnetic moment and meson properties.

Contribution

It presents the first high-precision measurement of the $e^+e^- o K^+K^-$ cross section in this energy range with implications for muon g-2 and meson parameters.

Findings

Measured cross section with 2% systematic uncertainty.

Calculated contribution to muon anomalous magnetic moment.

Compared $e^+e^- o K^+K^-$ and $e^+e^- o K^0_SK^0_L$ cross sections.

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 $a_{\mu}^{K^+K^-} = (19.33 \pm 0.40) \times 10^{-10}$, and to obtain the $\phi(1020)$ meson parameters. We consider the relationship between the $e^+e^- \to K^+K^-$ and $e^+e^- \to K^0_SK^0_L$ cross sections and compare it to the theoretical expectations.