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

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