New ${\Omega }_c^0$ baryons discovered by LHCb as the members of $1P$ and $2S$ states

Abstract

Inspired by the newly observed ${\Omega }_c^0$ states at LHCb, we decode their properties by performing an analysis of mass spectrum and decay behavior. Our studies show that the five narrow states, i.e., ${\Omega }_c(3000{)}^0$, ${\Omega }_c(3050{)}^0$, ${\Omega }_c(3066{)}^0$, ${\Omega }_c(3090{)}^0$, and ${\Omega }_c(3119{)}^0$, could be grouped into the $1P$ states with negative parity. Among them, the ${\Omega }_c(3000{)}^0$ and ${\Omega }_c(3090{)}^0$ states could be the $J^P=1/2^{-}$ candidates, while ${\Omega }_c(3050{)}^0$ and ${\Omega }_c(3119{)}^0$ are suggested as the $J^P=3/2^{-}$ states. ${\Omega }_c(3066{)}^0$ could be regarded as a $J^P=5/2^{-}$ state. Since the the spin-parity, the electromagnetic transitions, and the possible hadronic decay channels ${\Omega }_c^{(\ast )}\pi$ have not been measured yet, other explanations are also probable for these narrow ${\Omega }_c^0$ states. Additionally, we discuss the possibility of the broad structure ${\Omega }_c(3188{)}^0$ as a $2S$ state with $J^P=1/2^{+}$ or $J^P=3/2^{+}$. In our scheme, ${\Omega }_c(3119{)}^0$ cannot be a $2S$ candidate.

Comments: 10 pages, 3 figures, 5 tables, typos corrected. Published in Phys. Rev. D