Strong decays of multistrangeness baryon resonances in the quark model

초록

Decay properties of multistrangeness Xi and Omega baryon resonances are investigated within the constituent quark model by including relativistic corrections. The strong decay widths of various Xi and Omega resonances are computed and tested for internal quark cofigurations to pin down their spin-parity (J(P)) quantum numbers and internal structures. We found that the Roper-like resonances in the multistrangeness sector have large decay widths bearing resemblances to their siblings in light and heavy baryon sectors. In addition, we obtained the decay ratio for the Omega(2012) as Gamma(Omega -> Xi(K) over bar pi)/Gamma(Omega -> Xi(K) over bar) = 4.5%, which is consistent with the experimental data when J(P) = 3/2(-) is assigned. This observation holds the possibility that the Omega(2012) could naturally be explained as a three-quark state in the quark model. The decays of other low-lying Xi and Omega resonances are systematically analyzed, which would be useful to unveil the structure of these resonances in future experiments.

키워드