First Observation of Heavy Baryons Σ b and Σ b^* - High Energy Physics - ExperimentReport as inadecuate




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Abstract: We report an observation of new bottom baryons produced in proton-antiprotoncollisions at the Tevatron. Using 1.1 fb^{-1} of data collected by the CDF IIdetector, we observe four \Lambda b^0\pi^{\pm} resonances in the fullyreconstructed 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 andmeasure the following masses: m {\Sigma b^+} = 5807.8^{+2.0} {-2.2}stat. \pm1.7syst. MeV-c^2, m {\Sigma b^-} = 5815.2 \pm 1.0stat. \pm 1.7syst.MeV-c^2, and m\Sigma b^* - m\Sigma b = 21.2^{+2.0} {-1.9}stat.^{+0.4} {-0.3}syst. MeV-c^2.



Author: CDF Collaboration: T. Aaltonen, et al

Source: https://arxiv.org/







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