Neutral kaon mass measurement with the CMD-3 derector at VEPP-2000

Abstract

Using more than 600 thousand $K_S^0\to {\pi }^{+}{\pi }^{-}$ decays from the $e^{+}{e}^{-}\to \varphi (1020)\to K_S^0{K}_L^0$ reaction, the neutral kaon mass has been measured with the CMD-3 detector at the VEPP-2000 collider. Using the beam energies control by the back-scattering laser light photons, and a calibration to the world average $\varphi$-meson mass, the neutral kaon mass is determind to be m($K^0$) = 497.587 $\pm$ 0.004(stat.) $\pm$ 0.008(syst.) $\pm$ 0.009(calibr.) \mevcc, where the first uncertainty is statistical, the second is systematic, and the third is the uncertainty from the energy calibration.

23 pages, 17 figures, 2 tables