A possible interpretation of the newly observed $\Omega (2012)$ state

Abstract

Inspired by the newly observed $\Omega (2012)$ state at Belle II, we investigate the two-body strong decays of $\Omega$ baryons up to $N=2$ shell within the chiral quark model. Our results indicate that: (i) the newly observed $\Omega (2012)$ state could be assigned to the spin-parity $J^P=3/2^{-}$ state $|70{,}^{2}10,1,1,{\frac{3}{2}}^{-}⟩$ and the experimental data can be reasonably described. However, the spin-parity $J^P=1/2^{-}$ state $|70{,}^{2}10,1,1,{\frac{1}{2}}^{-}⟩$ and spin-parity $J^P=3/2^{+}$ state $|56{,}^{4}10,2,0,{\frac{3}{2}}^{+}⟩$ can't be completely excluded. (ii) The $D$-wave states in the $N=2$ shell are most likely to be narrow states with a width of dozens of MeV and have a good potential to be observed in the $\Xi K$ and/or $\Xi (1530)K$ channels in future experiments. The $\Omega (2250)$ resonance listed in PDG may be a good candidate of the $J^P=5/2^{+}$ $1D$ wave state $|56{,}^{4}10,2,2,5/2^{+}⟩$.

Comments: 6 pages, 2 figures