Natural explanation of recent results on $e^{+}e^{-}\to\Lambda\bar{\Lambda}$

TL;DR

This paper explains recent experimental data on the $e^{+}e^{-} o ext{Lambda}ar{ ext{Lambda}}$ process near threshold through final-state interactions, linking cross section enhancement to low-energy states in the potential.

Contribution

It provides a natural explanation for the cross section enhancement using a simple analytical model based on final-state interactions.

Findings

The model fits experimental data very well.

Enhancement is due to low-energy states in the Lambda-antLambda potential.

Final-state interactions explain the near-threshold cross section behavior.

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.