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.

Comments: 3 pages, 1 figure