Observation and Mass Measurement of the Baryon $Ξ^-_b$

Details Observation and Mass Measurement of the Baryon $Ξ^-_b$ Observation and Mass Measurement of the Baryon $Ξ^-_b$

2007-07-04

arxiv.org/abs/0707.0589v2

Phys.Rev.Lett.99:052002,2007

Physics

High Energy Physics

High Energy Physics - Experiment

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

Scientific paper

10.1103/PhysRevLett.99.052002

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/$c^2$.

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