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Measurement of the Xi(-)(b) and Omega(-)(b) baryon lifetimes
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LHCb Collaboration (Including: Back, J. J., Blake, Thomas, Craik, Daniel, Dossett, D., Gershon, T. J., Kreps, Michal, Latham, Thomas, Pilar, T., Poluektov, Anton, Reid, Matthew M., Silva Coutinho, R., Wallace, Charlotte and Whitehead, M. (Mark)). (2014) Measurement of the Xi(-)(b) and Omega(-)(b) baryon lifetimes. Physics Letters B, Volume 736 (Number 7). pp. 154-162. doi:10.1016/j.physletb.2014.06.064 ISSN 0370-2693.
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Official URL: http://dx.doi.org/10.1016/j.physletb.2014.06.064
Abstract
Using a data sample of pp collisions corresponding to an integrated luminosity of 3 fb−1, the Ξ−b and Ω−b baryons are reconstructed in the Ξ−b → J/ψΞ− and Ω−b → J/ψΩ− decay modes and their lifetimes measured to be
τ(Ξ−b) = 1.55+0.10−0.09 (stat) ± 0.03 (syst) ps,
τ(Ω−b) = 1.54+0.26−0.21 (stat) ± 0.05 (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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