  By using the covariant L-S Scheme for the partial wave analysis, we deduce
the ratios between the S-wave and D-wave contributions from the recent data of
$\psi(1^-) \to B_8(1/2^+) \bar{B}_8(1/2^-)$ from the BESIII collaboration. For
the $J/\psi\to \Lambda\bar{\Lambda}$ and $J/\psi(\psi(2S))\to
\Sigma^{+}\bar{\Sigma}^{-}$, the ratios are fixed and the average angular
momenta are computed to estimate the effective radii of these processes. The
results show that the effective radii of these decays of $J/\psi(\psi(2S))$ are
very small, which are around 0.04 fm. Thus, it is a nice place to search
excited baryon resonances with lower spin in the decays of $J/\psi(\psi(2S))$.
Furthermore, for the other $\psi(1^-) \to B_8(1/2^+) \bar{B}_8(1/2^-)$
reactions, we propose some methods to get such effective radius.
