Neutral-Strange-Particle Production in 205-GeV<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>pp</mml:mi></mml:math>Interactions

A bubble-chamber study of proton-proton interactions at 205 GeV yielded 66 ${K}^{0}$'s, 28 $\ensuremath{\Lambda}$'s, and 2 $\ensuremath{\Lambda}$'s produced in the backward c.m. hemisphere. The cross sections for $p+p\ensuremath{\rightarrow}(\frac{\ensuremath{\Lambda}}{{\ensuremath{\Sigma}}^{0}})$ + anything and $p+p\ensuremath{\rightarrow}(\frac{{K}^{0}}{{\overline{K}}^{0}})$ + anything are 3.2\ifmmode\pm\else\textpm\fi{}0.6 and 12.9\ifmmode\pm\else\textpm\fi{}1.7 mb, respectively. Comparison of the invariant cross section with lower-energy data shows that ($\frac{\ensuremath{\Lambda}}{{\ensuremath{\Sigma}}^{0}}$) production is consistent with approximate scaling behavior above 28 GeV, whereas the ($\frac{{K}^{0}}{{\overline{K}}^{0}}$) invariant cross section has increased considerably between 28 and 205 GeV.

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