A model to explain angular distributions of $J/\psi$ and $\psi(2S)$ decays into $\Lambda\overline{\Lambda}$ and $\Sigma^0\overline{\Sigma}^0$

TL;DR

This paper proposes a theoretical model to explain the observed differences in angular distributions of $J/ar{ ext{}}$ and $ ext{ }ar{ ext{}}$ meson decays into hyperon pairs, based on BESIII experimental data.

Contribution

The paper introduces a novel model that accounts for the contrasting angular distribution trends in specific meson decay channels.

Findings

Model successfully explains the opposite angular distribution trend in $ ext{ }ar{ ext{}}$ decay channels.

Provides a unified explanation for all four decay channels observed by BESIII.

Enhances understanding of hyperon production in meson decays.

Abstract

BESIII data show a particular angular distribution for the decay of the $J/\psi$ and $\psi(2S)$ mesons into the hyperons $\Lambda\overline{\Lambda}$ and $\Sigma^0\overline{\Sigma}^0$. More in details the angular distribution of the decay $\psi(2S) \to \Sigma^0\overline{\Sigma}^0$ exhibits an opposite trend with respect to that of the other three channels: $J/\psi \to \Lambda\overline{\Lambda}$, $J/\psi \to \Sigma^0\overline{\Sigma}^0$ and $\psi(2S) \to \Lambda\overline{\Lambda}$. We define a model to explain the origin of this phenomenon.