Diquark model for $J/ \psi$ baryonic decays

The baryonic decays of $J/ \psi$ provide a new way to study the internal structure of baryons. We apply a simple diquark model to the calculation of the decay cross-sections for the reactions $J/ \psi \longrightarrow \bar{p}p$, $\bar pN^*(1440)$, $\bar{N}^{\ast}N^{\ast}$, $\bar{\Lambda}\Lambda$ and $\bar\Sigma^0\Sigma^0$. The results are different from those given by the ordinary constituent quark model. Hence these reactions may provide a new check of two different pictures for the baryons.