Strong decays of the newly observed narrow $Ω_b$ structures

Abstract

Motivated by the newly observed narrow structures $Ω_b(6316)^-$, $Ω_b(6330)^-$, $Ω_b(6340)^-$, and $Ω_b(6350)^-$ in the $Ξ_b^0 K^-$ mass spectrum, we investigate the strong decays of the low-lying $Ω_b$ states within the $^3P_0$ model systematically. According to their masses and decay widths, the observed $Ω_b(6316)^-$, $Ω_b(6330)^-$, $Ω_b(6340)^-$, and $Ω_b(6350)^-$ resonances can be reasonably assigned as the $λ-$mode $Ω_b(1P)$ 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 $Ω_b(2S)$ and $Ω_b(1D)$ states, our predictions show that these states have relatively narrow total widths and mainly decay into the $Ξ_b \bar K$, $Ξ_b^\prime \bar K$ and $Ξ_b^{\prime*} \bar K$ final states. These abundant theoretical predictions may be valuable for searching more excited $Ω_b$ states in future experiments.