Identification of the newly observed $Σ_b(6097)^\pm$ baryons from their strong decays

Abstract

Two bottom $Σ_b(6097)^\pm$ baryons were observed in the final states $Λ_b^0π^-$ and $Λ_b^0π^+$ in $pp$ collision by LHCb collaboration, whose masses and widths were measured. In a $^{3}P_{0}$ model, the strong decay widths of two ground $S$-wave and seven excited $P$-wave $Σ_b$ baryons have been systematically computed. Numerical results indicate that the newly observed $Σ_b(6097)^\pm$ are very possibly $Σ_{b2}^1({3\over 2}^-)$ with $J^P={3\over 2}^-$ or $Σ_{b2}^1({5\over 2}^-)$ with $J^P={5\over 2}^-$. The predicted decay widths of $Σ_b(6097)^\pm$ are consistent with experimental measurement from LHCb. In particular, it may be possible to distinguish these two assignments through ratios $Γ({Σ_b(6097)^\pm\to Σ_b^\pmπ^0})/Γ({Σ_b(6097)^\pm\to Σ_b^{*\pm}π^0})$, which can be measured by experiments in the future. In the meantime, our results support the assignments that $Σ_b^\pm$ and $Σ_b^{*\pm}$ are the ground $S$-wave $Σ_b$ baryons with $J^P={1\over 2}^+$ and $J^P={3\over 2}^+$, respectively.

5 pages, 6 tables, RevTex