Electron-positron annihilation into $K\bar{K}π$ and their contributions to $(g-2)_μ$

Bing-Hai Qin, Wen Qin, Ling-Yun Dai

Published 2024-03-21Version 1

In this paper, a coherent study of the $e^+e^-$ annihilation into $K^+K^-\pi^0$, $K^0_SK^0_L\pi^0$ and $K^0_SK^\pm\pi^\mp$ is carried out within the framework of resonance chiral theory. The amplitudes are fixed by fitting to the experimental cross-section and invariant mass spectrum. With these amplitudes, one can calculate the hadronic vacuum polarization form factors of these processes. The leading order contributions of $\sigma(e^+e^- \to K\bar{K}\pi)$ to the anomalous magnetic moment of the muon, $(g-2)_\mu$, is obtained as $a_\mu^{\rm HVP,LO}(e^+e^- \to K\bar{K}\pi)=(3.07\pm0.07)\times10^{-10}$ up to $E_{\rm cm}=2.3$ GeV.