Interpretation of the excited $Ω_c$ 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 $Ω_c$ baryons are investigated within the chiral quark model combined with the $^3P_0$ decay mechanism. Following the LHCb Collaboration's observations, we extend our previous study of the $Ξ_c^{\prime}$ system to the $Ω_c$ system, with all model parameters inherited from our earlier work. Our results consistently describe the observed $Ω_c$ spectrum: $Ω_c(3000)$, $Ω_c(3050)$, $Ω_c(3065)$, and $Ω_c(3090)$ are well described as $λ$-mode $1P$ states with $J^P=1/2^-$, $3/2^-$, $3/2^-$, and $5/2^-$, respectively. $Ω_c(3119)$ cannot be described as a pure three-quark excitation. Furthermore, the $Ω_c(3185)$ and $Ω_c(3327)$ may be assigned to the $2S$ and $1D$ states, respectively. These results offer a coherent picture of the low-lying $Ω_c$ spectrum and motivate further experimental tests.