Annihilations of Antiprotons at Rest in Hydrogen. VI. Kaonic Final States

Abstract

We present here experimental results on the annihilation of stopped antiprotons into $K\overline{K}+3\ensuremath{\pi}$, $K{\overline{K}}_{\ensuremath{\eta}}$, and $K{\overline{K}}_{\ensuremath{\omega}}$. We find the branching ratios for $\overline{p}+p\ensuremath{\rightarrow}{K}_{1}{K}_{1}\ensuremath{\eta}$ and $\overline{p}+p\ensuremath{\rightarrow}{K}_{1}{K}_{1}\ensuremath{\omega}$ to be (0.25\ifmmode\pm\else\textpm\fi{}0.04) \ifmmode\times\else\texttimes\fi{} ${10}^{\ensuremath{-}3}$ and (1.08\ifmmode\pm\else\textpm\fi{}0.16) \ifmmode\times\else\texttimes\fi{} ${10}^{\ensuremath{-}3}$, respectively. From events of the latter reaction we find the width of the $\ensuremath{\omega}$ meson to be 12.3\ifmmode\pm\else\textpm\fi{}2.0 MeV. The ${E}^{0}$ meson is observed and evidence is seen for the assignment of even charge conjugation and even $G$ parity to this resonance. In addition, we have used events from the reaction $\overline{p}+p\ensuremath{\rightarrow}{K}_{1}{K}^{\ifmmode\pm\else\textpm\fi{}}{\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}$ to measure the mass difference between the charged and neutral ${K}^{*}$. We find ${M}_{{\mathrm{K}}^{{*}_{0}},{\stackrel{-}{\mathrm{K}}}^{{*}_{0}}}\ensuremath{-}{M}_{{\mathrm{K}}^{*\ifmmode\pm\else\textpm\fi{}}}=6.3\ifmmode\pm\else\textpm\fi{}4.1$ MeV.