Understanding the low-lying ${\Omega }_c$ structures from a coupled-channel perspective

Abstract

We perform a systematic analysis of the low-lying ${\Omega }_c$ structures in a coupled-channel approach. The couplings between meson-baryon channels, ${\Xi }_c\bar{K}$, ${\Xi }_c^{\prime }\bar{K}$, ${\Xi }_c^{\ast }\bar{K}$, ${\Omega }_c\eta$ and ${\Omega }_c^{\ast }\eta$, and three-quark bare states ${\Omega }_c(1P_{\lambda })$ are considered. We predict a bound state ${\Omega }_c(2954)$ below the ${\Xi }_c\bar{K}$ threshold with $(J^P,j)=(1/2^{-},0)$, which can be studied in the final states of ${\Omega }_c^{(\ast )}\pi$ and ${\Omega }_c^{(\ast )}\gamma$. Also, the resonances ${\Omega }_c(3000)$ and ${\Omega }_c(3050)$ can be classified as the lower $(J^P,j)=(1/2^{-},1)$ and $(J^P,j)=(3/2^{-},1)$ states, respectively. Our present assignments based on this coupled-channel perspective are significantly different from those of traditional three-quark picture and of molecular scenario. The future BelleII and LHCb experiments can search for the bound state ${\Omega }_c(2954)$ and measure the spin-parities of particles ${\Omega }_c(3000)$ and ${\Omega }_c(3050)$ to test our predictions.

Comments: 11 pages, 5 figures. Minor modifications, accepted version