Neutral-particle production in 100-GeV/cp¯pinteractions

We have investigated the inclusive production of $\ensuremath{\gamma}$, ${K}_{S}^{0}$, ${\ensuremath{\Lambda}}^{0}$, and ${\overline{\ensuremath{\Lambda}}}^{0}$ in 100-GeV/c $\overline{p}p$ interactions in the 30-in. hydrogen bubble chamber at Fermilab. We present various inclusive distributions and compare them with corresponding distributions in 100-GeV/c $\mathrm{pp}$ interactions and lower-energy $\overline{p}p$ interactions. We find some evidence for $\ensuremath{\Sigma}(1385)$ production but none for ${K}^{*}(890)$ production. We find evidence for a nonzero ${\ensuremath{\Lambda}}^{0}$ polarization of -0.45 \ifmmode\pm\else\textpm\fi{} 0.21.