Inclusive photoproduction of neutral strange particles at 20 GeV

We have studied inclusive production of $K_S^0$, $\Lambda$, and $\overline{\Lambda }$ particles in 20-GeV $\gamma p$ interactions and have found features similar to those observed in both hadronic and leptonic interactions. The production cross sections, charged-particle multiplicities, and average $\Lambda$ polarization are reported. Inclusive distributions of $x$ and $p_T$ are shown and discussed in terms of quark fragmentation models. Production cross sections for $K^{*}\mathrm{}\left(890\right)\mathrm{}$ and ${\Sigma }^{*}\mathrm{}\left(1385\right)\mathrm{}$ are also reported.