A bubble-chamber study of proton-proton interactions at 205 GeV yielded 66 K⁰'s, 28 Λ's, and 2 Λ's produced in the backward c.m. hemisphere. The cross sections for p+p→(ΛΣ⁰) + anything and p+p→(K⁰K̄⁰) + anything are 3.2±{}0.6 and 12.9±{}1.7 mb, respectively. Comparison of the invariant cross section with lower-energy data shows that (ΛΣ⁰) production is consistent with approximate scaling behavior above 28 GeV, whereas the (K⁰K̄⁰) invariant cross section has increased considerably between 28 and 205 GeV.
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Charlton et al. (1973) studied this question.