Observation of the doubly strange b baryon Ωb-
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2008-12-05
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Abazov, V. M.
Abbott, B.
Abolins, M.
Acharya, B. S.
Adams, M.
Adams, T.
Aguilo, E.
Ahsan, M.
Alexeev, G. D.
Alkhazov, G.
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We report the observation of the doubly strange b baryon Ωb- in the decay channel Ωb-→J/ψΩ-, with J/ψ→μ+μ- and Ω-→ΛK-→(pπ-)K-, in pp̄ collisions at s=1.96TeV. Using approximately 1.3fb-1 of data collected with the D0 detector at the Fermilab Tevatron Collider, we observe 17.8±4.9(stat)±0.8(syst) Ωb- signal events at a mass of 6.165±0.010(stat)±0.013(syst) GeV. The significance of the observed signal is 5.4σ, corresponding to a probability of 6.7×10-8 of it arising from a background fluctuation. © 2008 The American Physical Society.
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Physical Review Letters, v. 101, n. 23, 2008.