Observation and Mass Measurement of the Baryon $Ξ_{b}^{-}$

Publisher Website

3 August 2007

journal article
research article
Published by American Physical Society (APS) in Physical Review Letters

Vol. 99 (5) , 052002
https://doi.org/10.1103/physrevlett.99.052002

Abstract

We report the observation and measurement of the mass of the bottom, strange baryon

Ξ_{b}^{-}

through the decay chain

Ξ_{b}^{-} \to J / ψ Ξ^{-}

, where

J / ψ \to μ^{+} μ^{-}

,

Ξ^{-} \to Λ π^{-}

, and

Λ \to p π^{-}

. A signal is observed whose probability of arising from a background fluctuation is

6.6 \times 10^{- 15}

, or 7.7 Gaussian standard deviations. The

Ξ_{b}^{-}

mass is measured to be

5792.9 \pm 2.5 (stat)

\pm 1.7 (syst) MeV / c^{2}

.

Keywords

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