Annihilations of Antiprotons at Rest in Hydrogen. IV.p¯p→K¯Kππ

In a study of 735 000 antiproton annihilations at rest in the hydrogen bubble chamber, 3424 events of the reaction $\overline{p}+p\to K\overline{K}\pi \pi$ were observed. We present here the invariant-mass distributions and scatterplots for this reaction, separated according to the three channels $K_1{K}_1{\pi }^{+}{\pi }^{-}$, $K_1\left(K^0\right){\pi }^{+}{\pi }^{-}$, and $K_1{K}^{\pm }{\pi }^{\mp }{\pi }^0$. Also presented are branching ratios into the various channels. $K^{*}$ production is found to dominate in all cases. The fraction of $\overline{p}p$ annihilations into $K^{*}{\overline{K}}^{*}$ is (4.5±0.9)×${10}^{-3\mathrm{}}$, and into $K^{*}K\pi$ is (7.7±1.7)×${10}^{-3\mathrm{}}$.