Measurement of the $\Xi_b^-$ and $\Omega_b^-$ baryon lifetimes - IN2P3 - Institut national de physique nucléaire et de physique des particules Access content directly
Journal Articles Physics Letters B Year : 2014

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

R. Aaij
  • Function : Author
J. He
J. Cogan
O. Leroy
J. Serrano


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.

Dates and versions

in2p3-00989681 , version 1 (12-05-2014)



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