Measurement of b-Baryons with the CDF II detector

We report the observation of new bottom baryon states. The most recent result is the observation of the baryon \Xi_b^- through the decay \Xi_b^- to J/\psi \Xi^-. The significance of the signal corresponds to 7.7 sigma and the \Xi_b^- mass is measured to be 5792.9 \pm 2.5(stat.) \pm 1.7(syst.) MeV/c^2. In addition we observe four resonances in the \Lambda_b^0 \pi^{\pm} spectra, consistent with the bottom baryons \Sigma_b^{(*)\pm}. All observations are in agreement with theoretical expectations.