Study of the $\Sigma_b$ Baryon with the CDF Detector

We present a measurement of properties of the $\Sigma_b$ baryon in proton-antiproton collisions at a center-of-mass energy of 1.96 TeV. Using 2.9 fb$^{-1}$ of data collected with the CDF\,II detector, we observe four $\Lambda_b\,\pi$ resonances in the fully reconstructed decay mode $\Lambda_b \rightarrow J/\psi\Lambda$ with $J/\psi \rightarrow \mu^+\mu^-$ and $\Lambda \rightarrow p\pi$. In addition, we combine the selected $\Lambda_b$ signal from $\Lambda_b \rightarrow J/\psi\Lambda$ with events from the $\Lambda_b \rightarrow \Lambda_c\pi$ decay mode, with $\Lambda_c\rightarrow pK\pi$, to measure the $\Lambda_b$ polarization.