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

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 and mesons into and hyperons: the angular distribution of the decay exhibits an opposite trend with respect to the other three channels: , and . We define a model to explain the origin of this phenomenon.