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

Abstract

We present here experimental results on the annihilation of stopped antiprotons into $K\overline{K}+3\mathrm{}\pi$, $K{\overline{K}}_{\eta }$, and $K{\overline{K}}_{\omega }$. We find the branching ratios for $\overline{p}+p\to K_1{K}_1\eta$ and $\overline{p}+p\to K_1{K}_1\omega$ to be (0.25±0.04) × ${10}^{-3\mathrm{}}$ and (1.08±0.16) × ${10}^{-3\mathrm{}}$, respectively. From events of the latter reaction we find the width of the $\omega$ meson to be 12.3±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 $\overline{p}+p\to K_1{K}^{\pm }{\pi }^{\pm }$ to measure the mass difference between the charged and neutral $K^{*}$. We find $M_{{\mathrm{K}}^{{*}_0},{\bar{\mathrm{K}}}^{{*}_0}}-M_{{\mathrm{K}}^{*\pm }}=6.3\mathrm{}\pm 4.1$ MeV.