Predictions for masses of Ξb baryons

The recent observation by CDF of Σ±b (uub and ddb) baryons within 2 MeV of the predicted Σb−Λb splitting has provided strong confirmation for the theoretical approach based on modeling the color hyperfine interaction. We now apply this approach to predict the masses of the Ξb family of baryons with quark content usb and dsb – the ground state Ξb at 5790 to 5800 MeV, and the excited states Ξ′b and Ξ ∗ b . The main source of uncertainty is the method used to estimate the mass difference mb −mc from known hadrons. We verify that corrections due to the details of the interquark potential and to Ξb–Ξ ′ b mixing are small. PACS codes: 14.20.Mr, 12.40.Yx, 12.39.Jh, 11.30.Hw