Strong decays of the newly observed narrow $Ω_b$ structures

Wei Liang, Qi-Fang Lü

Published 2020-01-06Version 1

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 $^3P_0$ model systematically. According to their masses and decay widths, the observed $\Omega_b(6316)^-$, $\Omega_b(6330)^-$, $\Omega_b(6340)^-$, and $\Omega_b(6350)^-$ can be reasonably assigned as the $\lambda-$mode $\Omega_b(1P)$ states with $J^P=1/2^-$, $J^P=3/2^-$, $J^P=3/2^-$, and $J^P=5/2^-$. Meanwhile, the remaining $J^P=1/2^-$ $P-$wave state 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 $\Xi_b^{\prime*} \bar K$ final states. These abundant theoretical predictions may be valuable for searching more excited $\Omega_b$ states in future experiments.