K20Interactions, Decays and Regenerative Properties at590 MeVcin Liquid Hydrogen

An earlier experiment has reported an "anomalous" coherent regenerative production of ${K_1}^0$ mesons in liquid hydrogen. The effect is reinterpreted in terms of a constructive interference between conventional regenerative amplitudes and the $\mathrm{CP}$-violating decay ${K_2}^0\to 2\pi$. Experimental support is given. From new data, the ${K_2}^0$ branching ratio $\frac{({K_2}^0\to \pi \mu \nu )}{({K_2}^0\to \pi e\nu )}$ has been measured to be 0.7±0.2. Results are presented on the decay ${K_2}^0\to {\pi }^{+}{\pi }^{-}{\pi }^0$ and on the strong-interaction reactions between ${K_2}^0$ mesons and protons at $590 \frac{\mathrm{MeV}}{c}$.