Production ofKMesons and Hyperons in Hydrogen by 1.95-Bev Protons

A search has been made for $K$ mesons and hyperons produced by a well-collimated beam of 1.95-Bev protons in a hydrogen-filled diffusion chamber. One case of associated production was observed, which is interpreted as $p+p\to {\Lambda }^0+K^{+}+p$. In a total track length of 2.4×${10}^5$ g/${\mathrm{cm}}^2$ of hydrogen, no other hyperons or $K$ mesons were observed to be produced. It is concluded that the cross section for production of $K$ mesons and hyperons is probably less than 0.4 mb.