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.

13 pages, 3 figures

References in corpus (4)

• PYTHIA 6.4 Physics and Manual
• Direct observation of the strange b baryon Xi_b^{-}
• Observation of the doubly strange b baryon Omega_b-
• Mass and lifetime measurements of bottom and charm baryons in $p\bar{p}$ collisions at $\sqrt{s}= 1.96 TeV

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• Precision measurement of the mass and lifetime of the ${\Xi }_b^0$ baryon
• Precision measurement of the mass and lifetime of the Xi_b^- baryon
• Axial-Vector Emitting Weak Nonleptonic Deacys of ${\Omega }_c^0$ Baryon
• The decays ${\Xi }_b\to {\Lambda }_b\pi$ and diquark correlations in hyperons
• Heavy Flavour Physics at the LHC
• Restudy of the color-allowed two-body nonleptonic decay of bottom baryons ${\Xi }_b$ and ${\Omega }_b$ supported by hadron spectroscopy
• Lifetimes of some $b$-flavored hadrons
• Precision measurement of the ${\Xi }_b^{-}$ baryon lifetime