Abstract
The strong decays of the $P$-wave $\Sigma_b$, $\Xi_b'$ and $\Omega_b$ baryons are investigated with a constituent quark model in the $j$-$j$ coupling scheme. The results show that the newly observed $\Sigma_b(6097)$ and $\Xi_b(6227)$ states by the LHCb collaboration can be assigned as the $\lambda$-mode $P$-wave singly bottom baryons. Given the heavy quark symmetry, both the $\Sigma_b(6097)$ and $\Xi_b(6227)$ states favor the light spin $j=2$ states with spin-parity numbers $J^P=3/2^-$ or $J^P=5/2^-$. More $P$-wave singly bottom baryons are most likely to be observed in future experiments for their relatively narrow width.
Highlights
The LHCb collaboration announced the observation of a new bottom baryon Ξbð6227Þ− in both Λ0bK− and Ξ0bπ decay modes [1]
The strong decays of the P-wave singly bottom heavy baryons belonging to 6F are investigated with a constituent quark model in the j-j coupling scheme
The masses of the well-established hadrons used in the calculations are taken from the Particle Data Group (PDG) [33], and the masses of the undiscovered initial states adopted from the predictions in Ref. [4]
Summary
The LHCb collaboration announced the observation of a new bottom baryon Ξbð6227Þ− in both Λ0bK− and Ξ0bπ decay modes [1]. Compared with the mass spectrum predicted in various models [3,4,5,6,7,8,9,10,11,12,13], it is found that the Ξbð6227Þ− and Σbð6097ÞÆ are good candidates of the λ-mode P-wave bottom baryons belonging to 6F. It is interesting to find that the newly observed state Ωcð3000Þ at LHCb [17] may be explained as a JP 1⁄4 1=2− resonance via a j2P1=2i − j4P1=2i mixing [18] This may be evidence that the physical states of singly heavy baryons more favor the j-j coupling scheme.
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