Strong decays of the newly observed narrow ${\Omega }_b$ structures

Abstract

Motivated by the newly observed narrow structures ${\Omega }_b(6316{)}^{-}$, ${\Omega }_b(6330{)}^{-}$, ${\Omega }_b(6340{)}^{-}$, and ${\Omega }_b(6350{)}^{-}$ in the ${\Xi }_b^0{K}^{-}$ mass spectrum, we investigate the strong decays of the low-lying ${\Omega }_b$ states within the ${}^3{P}_0$ model systematically. According to their masses and decay widths, the observed ${\Omega }_b(6316{)}^{-}$, ${\Omega }_b(6330{)}^{-}$, ${\Omega }_b(6340{)}^{-}$, and ${\Omega }_b(6350{)}^{-}$ resonances can be reasonably assigned as the $\lambda -$mode ${\Omega }_b(1P)$ states with $J^P=1/2^{-},3/2^{-},3/2^{-}$, and $5/2^{-}$. Meanwhile, the remaining $P-$wave state with $J^P=1/2^{-}$ should have a rather broad width, which can hardly be observed by experiments. For the ${\Omega }_b(2S)$ and ${\Omega }_b(1D)$ states, our predictions show that these states have relatively narrow total widths and mainly decay into the ${\Xi }_b\bar{K}$, ${\Xi }_b^{\prime }\bar{K}$ and ${\Xi }_b^{\prime \ast }\bar{K}$ final states. These abundant theoretical predictions may be valuable for searching more excited ${\Omega }_b$ states in future experiments.

Comments: 7 pages,4 figures,and 4 tables. Simplify the formalism of the model. Minor modifications. arXiv admin note: text overlap with arXiv:1910.06126 and arXiv:1908.00223