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Measurement of the $\Xi_b^-$ and $\Omega_b^-$ baryon lifetimes

Abstract : Using a data sample of pp collisions corresponding to an integrated luminosity of $3~ \rm fb^{-1}$, the $\Xi_b^-$ and $\Omega_b^-$ baryons are reconstructed in the $\Xi_b^- \rightarrow J/\psi \Xi^-$ and $\Omega_b^- \rightarrow J/\psi \Omega^-$ decay modes and their lifetimes measured to be $\tau (\Xi_b^-) = 1.55\, ^{+0.10}_{-0.09}~{\rm(stat)} \pm 0.03\,{\rm(syst)}$ ps, $\tau (\Omega_b^-) = 1.54\, ^{+0.26}_{-0.21}~{\rm(stat)} \pm 0.05\,{\rm(syst)}$ ps. These are the most precise determinations to date. Both measurements are in good agreement with previous experimental results and with theoretical predictions.
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http://hal.in2p3.fr/in2p3-00989681
Contributor : Claudine Bombar <>
Submitted on : Monday, May 12, 2014 - 11:37:52 AM
Last modification on : Wednesday, September 16, 2020 - 4:25:51 PM

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R. Aaij, Ziad Ajaltouni, M. Baalouch, E. Cogneras, O. Deschamps, et al.. Measurement of the $\Xi_b^-$ and $\Omega_b^-$ baryon lifetimes. Physics Letters B, Elsevier, 2014, 736, pp.154-162. ⟨10.1016/j.physletb.2014.06.064⟩. ⟨in2p3-00989681⟩

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