Possible interpretation of the newly observed Ωb states

Abstract

Inspired by the newly observed ${\mathrm{\Omega }}_b$ states by the LHCb Collaboration, we investigate the two-body strong decays of the low-lying $\lambda$-mode ${\mathrm{\Omega }}_b$ baryons up to $N=2$ shell using the chiral quark model within the j-j coupling scheme. Our results indicate that: (i) the newly observed states ${\mathrm{\Omega }}_b{(6316)}^{-}$ and ${\mathrm{\Omega }}_b{(6330)}^{-}$ are good candidates of the light spin $j=1$ states, while the spin-parity $J^P=1/2^{-}$ and $J^P=3/2^{-}$ cannot be distinguished. The other two states, ${\mathrm{\Omega }}_b(6340)$ and ${\mathrm{\Omega }}_b(6350)$ mostly correspond to the light spin $j=2$ states, while the spin-parity $J^P=3/2^{-}$ and $J^P=5/2^{-}$ cannot be distinguished as well. (ii) The 2S states with spin-parity $J^P=1/2^{+}$ and $J^P=3/2^{+}$, respectively, might be narrow states with a width of $\mathrm{\Gamma }<2$ MeV. (iii) The 1D states are not broad and the total decay widths vary from several to dozens of MeV, which have a good potential to be observed in future experiments.