Natural Explanation of Recent Results on $${{e}^{ + }}{{e}^{ - }} \to \Lambda \bar {\Lambda }$$

Abstract

We show that the recent experimental data on the cross section of the process $${{e}^{ + }}{{e}^{ - }} \to \Lambda \bar {\Lambda }$$ near the threshold can be perfectly explained by the final-state interaction of $$\Lambda $$ and $$\bar {\Lambda }$$. The enhancement of the cross section is related to the existence of low-energy real or virtual state in the corresponding potential. We present a simple analytical formula that fits the experimental data very well.