Measurement of the ${\Xi }_b^{-}$ and ${\Omega }_b^{-}$ baryon lifetimes

Abstract

Using a data sample of pp collisions corresponding to an integrated luminosity of $3\mathrm{f}{\mathrm{b}}^{-1}$, the ${\Xi }_b^{-}$ and ${\Omega }_b^{-}$ baryons are reconstructed in the ${\Xi }_b^{-}\to J/\psi {\Xi }^{-}$ and ${\Omega }_b^{-}\to J/\psi {\Omega }^{-}$ decay modes and their lifetimes measured to be $\tau ({\Xi }_b^{-})=1.55{}_{-0.09}^{+0.10}(\mathrm{stat})\pm 0.03(\mathrm{syst})$ ps, $\tau ({\Omega }_b^{-})=1.54{}_{-0.21}^{+0.26}(\mathrm{stat})\pm 0.05(\mathrm{syst})$ ps. These are the most precise determinations to date. Both measurements are in good agreement with previous experimental results and with theoretical predictions.

arXiv comment13 pages, 3 figures

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