Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1853387 | Physics Letters B | 2007 | 5 Pages |
Rescattering 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 qq¯ 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/ψJ/ψ and ψ(2S)ψ(2S) decays into ΛΛ¯, Σ0Σ¯0 and Ξ−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/ψ→Σ0Σ¯0, namely, it might come from the baryonic SU(3)FSU(3)Fsymmetry breaking by incorporating rescattering effects.