Determination of the Fundamental Parameters of theK0−K¯0System in the Energy Range 30-110 GeV

Abstract

$K^0$ regeneration data in the energy range 30-110 GeV have been analyzed to determine the values of the $K_L-K_S$ mass difference, $\Delta m$, $K_S$ lifetime, ${\tau }_S$, and $\mathrm{CP}$-nonconservation parameter ${\eta }_{+-}$. We find $\Delta m=0.482\mathrm{}\left(14\right)\mathrm{}\times {10}^{10}\hslash$ ${\mathrm{s}}^{-1\mathrm{}}$, ${\tau }_S=0.905\mathrm{}\left(7\right)\mathrm{}\times {10}^{-10\mathrm{}}$ s, $\left|{\eta }_{+-}\mathrm{}\right|=2.09\left(2\mathrm{}\right)\mathrm{}\times {10}^{-3\mathrm{}}$, and $tan{\varphi }_{+-}=0.709\mathrm{}\left(102\right)\mathrm{}$, corresponding to ${\varphi }_{+-}=35\mathrm{}\left(4\right)\mathrm{}°$. The data suggest that these parameters may have an anomalous energy dependence.