Using data from $p\overline{p}$ collisions at $\sqrt{s}=1.96\mathrm{TeV}$ recorded by the CDF II detector at the Fermilab Tevatron, we present improved measurements of the masses and first measurements of natural widths of the four bottom baryon resonance states ${\Sigma }_b^{+}$, ${\Sigma }_b^{*+}$ and ${\Sigma }_b^{-}$, ${\Sigma }_b^{*-}$. These states are fully reconstructed in their decay modes to ${\Lambda }_b^0{\pi }^{\pm }$ where ${\Lambda }_b^0\to {\Lambda }_c^{+}{\pi }^{-}$ with ${\Lambda }_c^{+}\to p{K}^{-}{\pi }^{+}$. The analysis is based on a data sample corresponding to an integrated luminosity of $6.0{\mathrm{fb}}^{-1}$ collected by an online event selection based on tracks displaced from the $p\overline{p}$ interaction point.

• Received 14 December 2011

DOI:https://doi.org/10.1103/PhysRevD.85.092011