Differential Cross Sections in ${\pi }^{-}p\to K^0{\Lambda }^0$ and ${\pi }^{-}p\to K^0{\Sigma }^0$ from 3 to 6 GeV/c

We have measured the differential cross sections for the associated-production reactions ${\pi }^{-}p\to K^0{\Lambda }^0$ and ${\pi }^{-}p\to K^0{\Sigma }^0$ at 3, 4, 5, and 6 GeV/c, with a total of over 40 000 events. We find that both reactions have exponential forward peaks for $-t\lesssim 0.4$ ${(\mathrm{G}\mathrm{e}\mathrm{V}/\mathit{c})}^2$, with no indication of forward-direction flattening or turnover; the slopes of the forward peaks show little if any variation with momentum; and the two cross sections are equal within experimental error from $-t=1.2\mathrm{}$ ${(\mathrm{G}\mathrm{e}\mathrm{V}/\mathit{c})}^2$ out to at least $-t=2.0\mathrm{}$ ${(\mathrm{G}\mathrm{e}\mathrm{V}/\mathit{c})}^2$.