The reactions $pp\to p\Lambda K^{+}$ and $pp\to p{\Sigma }^0{K}^{+}$ near their thresholds

Abstract

The reactions $pp\to p\Lambda K^{+}$ and $pp\to p{\Sigma }^0{K}^{+}$ are studied near their thresholds. The strangeness production process is described by the $\pi$- and $K$ exchange mechanisms. Effects from the final state interaction in the hyperon-nucleon system are taken into account rigorously. It is found that the $\Lambda$ production is dominated by $K$ exchange whereas $K$- as well as $\pi$ exchange play an important role for the ${\Sigma }^0$ case. It is shown that the experimentally observed strong suppression of ${\Sigma }^0$ production compared to $\Lambda$ production at the same excess energy can be explained by a destructive interference between $\pi$ and $K$ exchange in the reaction $pp\to p{\Sigma }^0{K}^{+}$. Implications of such an interference on the reaction $pp\to n{\Sigma }^{+}{K}^{+}$ are pointed out.

Revised version with corrected numerical results. The general conclusions remain unchanged

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