2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/182679Rescattering effects of baryon and antibaryon in heavy quarkonium decays are investigated by studying their angular distributions. The rescattering amplitudes are phenomenologically evaluated by modeling the intermediate range interaction as a $σ$ or pion meson exchange between $\qqbar$ quarks. The results show that the rescattering effects play an important role in determination of the angular distribution in heavy quarkonium decays. Especially, for $J/psi$ and $ψ'$ decays into $Λ\bar Λ$, $Σ^0\bar Σ^0$ and $Ξ^-\bar Ξ^+$ the angular distribution parameters could turn to be negative values in the limit of helicity conservation. These results provide us a possible explanation for understanding the negative sign of the angular distribution parameter measured for $J/psi \toΣ^0\barΣ^0$, namely, {\it it might come from the baryonic SU(3)$_F$ symmetry breaking by incorporating rescattering effects8 pages, 1 figures, Your comments are welcomeHigh Energy Physics - Phenomenologytext