# A possible explanation of the threshold enhancement in the process $e^+e^-\rightarrow \Lambda\bar{\Lambda}$

## TL;DR

This paper investigates the possible explanation for the threshold enhancement in the $e^+e^- o \Lambdaar{\Lambda}$ process by calculating the properties of strangeonium states and their decay modes, suggesting the $ ext{phi}(3^3S_1)$ as a likely candidate.

## Contribution

It provides a detailed theoretical analysis of strangeonium states' mass spectrum and decay widths, linking them to experimental threshold enhancements.

## Key findings

- The electronic decay width of D-wave strangeonium is 3-8 times larger than S-wave.
- The $ ext{phi}(3^3S_1)$ state can have a $\Lambdaar{\Lambda}$ decay width of several MeV.
- The $ ext{phi}(3^3D_1)$ and $ ext{phi}(4^3S_1)$ states have observable decay widths in future experiments.

## Abstract

Inspired by the recent measurement of the process $e^+e^-\rightarrow \Lambda\bar{\Lambda}$, we calculate the mass spectrum of the $\phi$ meson with the GI model. For the excited vector strangeonium states $\phi(3S,~4S,~5S,~6S)$ and $\phi(2D,~3D,~4D,~5D)$, we further investigate the electronic decay width with the Van Royen-Weisskopf formula, and the partial widths of the $\Lambda\bar{\Lambda}$, $\Xi^{-(*)}\bar{\Xi}^+$, and $\Sigma^{+(*)}\bar{\Sigma}^{-(*)}$ decay modes with the extended quark pair creation model. We find that the electronic decay width of the $D$-wave vector strangeonium is about $3\sim8$ times larger than that of the $S$-wave vector strangeonium. Around 2232 MeV the partial decay width of the $\Lambda\bar{\Lambda}$ mode can reach up to several MeV for $\phi(3^3S_1)$, while the partial $\Lambda\bar{\Lambda}$ decay width of $\phi(2^3D_1)$ is $\mathcal{O}(10^{-3})$ keV. If the threshold enhancement reported by the BESIII Collaboration arises from the strangeonium meson, this state is very likely to be the $\phi(3^3S_1)$ state. We also note that the $\Lambda\bar{\Lambda}$ and $\Sigma^{+}\bar{\Sigma}^{-}$ partial decay widths of the states $\phi(3^3D_1)$ and $\phi(4^3S_1)$ are about several MeV, respectively, which are enough to be observed in future experiments.