Revisit assignments of the new excited $Ω_c$ states with QCD sum rules

Abstract

In this article, we distinguish the contributions of the positive parity and negative parity $Ω_c$ states, study the masses and pole residues of the 1S, 1P, 2S and 2P $Ω_c$ states with the spin $J=\frac{1}{2}$ and $\frac{3}{2}$ using the QCD sum rules in a consistent way, and revisit the assignments of the new narrow excited $Ω_c^0$ states. The predictions support assigning the $Ω_c(3000)$ to be the 1P $Ω_c$ state with $J^P={\frac{1}{2}}^-$, assigning the $Ω_c(3090)$ to be the 1P $Ω_c$ state with $J^P={\frac{3}{2}}^-$ or the 2S $Ω_c$ state with $J^P={\frac{1}{2}}^+$, and assigning $Ω_c(3119)$ to be the 2S $Ω_c$ state with $J^P={\frac{3}{2}}^+$.