Interpretation of the excited ${\Omega }_c$ family via mass and width in the chiral quark model

Abstract

In this work, the mass and decay properties for low-lying orbital excitations of ${\Omega }_c$ baryons are investigated within the chiral quark model combined with the ${}^3{P}_0$ decay mechanism. Following the LHCb Collaboration's observations, we extend our previous study of the ${\Xi }_c^{\prime }$ system to the ${\Omega }_c$ system, with all model parameters inherited from our earlier work. Our results consistently describe the observed ${\Omega }_c$ spectrum: ${\Omega }_c(3000)$, ${\Omega }_c(3050)$, ${\Omega }_c(3065)$, and ${\Omega }_c(3090)$ are well described as $\lambda$-mode $1P$ states with $J^P=1/2^{-}$, $3/2^{-}$, $3/2^{-}$, and $5/2^{-}$, respectively. ${\Omega }_c(3119)$ cannot be described as a pure three-quark excitation. Furthermore, the ${\Omega }_c(3185)$ and ${\Omega }_c(3327)$ may be assigned to the $2S$ and $1D$ states, respectively. These results offer a coherent picture of the low-lying ${\Omega }_c$ spectrum and motivate further experimental tests.