First Observation of Heavy Baryons Σ_b and Σ_b^*

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  • 26 June 2007
Abstract
We report an observation of new bottom baryons produced in proton-antiproton collisions at the Tevatron. Using 1.1 fb^{-1} of data collected by the CDF II detector, we observe four \Lambda_b^0\pi^{\pm} resonances in the fully reconstructed decay mode \Lambda_b^0 \to \Lambda_c^+ \pi^-, where \Lambda_c^+ \to p K^- \pi^+. We interpret these states as the \Sigma_b^{(*)\pm} baryons and measure their masses to be: m_{\Sigma_b^+} = 5807.8^{+2.0}_{-2.2} (stat.) \pm 1.7 (syst.) MeV/c^2 m_{\Sigma_b^-} = 5815.2 \pm 1.0 (stat.) \pm 1.7 (syst.) MeV/c^2 m_{\Sigma_b^{*+}} = 5829.0^{+1.6}_{-1.8} (stat.) ^{+1.7}_{-1.8} (syst.) MeV/c^2 m_{\Sigma_b^{*-}} = 5836.4 \pm 2.0 (stat.) ^{+1.8}_{-1.7} (syst.) MeV/c^2

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