Observation and Mass Measurement of the Baryon ${\Xi }_b^{-}$

Abstract

We report the observation and measurement of the mass of the bottom, strange baryon ${\Xi }_b^{-}$ through the decay chain ${\Xi }_b^{-}\to J/\psi {\Xi }^{-}$, where $J/\psi \to {\mu }^{+}{\mu }^{-}$, ${\Xi }^{-}\to \Lambda {\pi }^{-}$, and $\Lambda \to p{\pi }^{-}$. Evidence for observation is based on a signal whose probability of arising from the estimated background is 6.6 x 10^{-15}, or 7.7 Gaussian standard deviations. The ${\Xi }_b^{-}$ mass is measured to be $5792.9\pm 2.5$ (stat.) $\pm 1.7$ (syst.) MeV/$c^2$.

Minor text changes for the second version. Accepted by Phys. Rev. Lett

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