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

M. Alekseev, A. Amoroso, R. Baldini Ferroli +28

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…