At 3.66 $\frac{\mathrm{BeV}}{c}$, the total cross section for $\overline{p}+p\to K+\overline{K}+m\pi$ where $m=1,2,\cdots$, is 2.9±0.4 mb. No two-body reactions of the form $\overline{p}p\to K\overline{K}$, $K{K}^{*}$, or $K^{*}{\overline{K}}^{*}$ have been observed. The angular distribution of kaons for three-body final states shows striking anisotropy but this effect diminishes with increasing multiplicity. An enhancement at low $K\overline{K}$ effective mass, with possible assignment of $I=1\mathrm{}$, has been observed, and this is compared with the ${K_1}^0{K_1}^0$ effect noted previously by several groups. The $K^{*}\mathrm{}\left(888\right)\mathrm{}$, $\rho$, and $\omega$ are prominent in several channels, but the data are consistent with no production of the $\phi$. Upper limits on the $\frac{\phi }{\omega }$ production ratio are presented. A search for resonances in the $K\pi \pi$ system at 1175, 1215, and 1270 MeV, as well as the $K\overline{K}\pi$ at 1280 and 1410 MeV, has yielded negative results.

• Received 26 August 1965

DOI:https://doi.org/10.1103/PhysRev.142.932