Two bottom ${\mathrm{\Sigma }}_b(6097{)}^{\pm }$ baryons were observed in the final states ${\mathrm{\Lambda }}_b^0{\pi }^{-}$ and ${\mathrm{\Lambda }}_b^0{\pi }^{+}$ 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 ${\mathrm{\Sigma }}_b$ baryons have been systematically computed. Numerical results indicate that the newly observed ${\mathrm{\Sigma }}_b(6097{)}^{\pm }$ are very possibly ${\mathrm{\Sigma }}_{b2}^1({\frac{3}{2}}^{-})$ with $J^P={\frac{3}{2}}^{-}$ or ${\mathrm{\Sigma }}_{b2}^1({\frac{5}{2}}^{-})$ with $J^P={\frac{5}{2}}^{-}$. In particular, the ratios $\mathrm{\Gamma }({\mathrm{\Sigma }}_b(6097{)}^{\pm }\to {\mathrm{\Sigma }}_b^{\pm }{\pi }^0)/\mathrm{\Gamma }({\mathrm{\Sigma }}_b(6097{)}^{\pm }\to {\mathrm{\Sigma }}_b^{*\pm }{\pi }^0)$ are different in these two assignments. The ratios can be measured as an evidence of the two different assignments of ${\mathrm{\Sigma }}_b(6097{)}^{\pm }$ in the future. In the meantime, our results support the assignments that ${\mathrm{\Sigma }}_b^{\pm }$ and ${\mathrm{\Sigma }}_b^{*\pm }$ are the ground $S$-wave ${\mathrm{\Sigma }}_b$ baryons with $J^P={\frac{1}{2}}^{+}$ and $J^P={\frac{3}{2}}^{+}$, respectively.

• Received 16 October 2018

DOI:https://doi.org/10.1103/PhysRevD.99.034018

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP³.

Published by the American Physical Society