Measurement of the mass and lifetime of the $Ω_b^-$ baryon
Creators: name: Aaij, R.
name: Beteta, C. Abellán
name: Adeva, B.
name: Adinolfi, M.
name: Ajaltouni, Z.
name: Akar, S.
name: Albrecht, J.
name: Alessio, F.
name: Alexander, M.
name: Ali, S.
name: Alkhazov, G.
name: Cartelle, P. Alvarez
name: Alves, A. A.
name: Amato, S.
name: Amerio, S.
name: Amhis, Y.
name: An, L.
name: Anderlini, L.
name: Andreassi, G.
name: Andreotti, M.
name: Andrews, J. E.
name: Appleby, R. B.
name: Gutierrez, O. Aquines
name: Archilli, F.
name: d'Argent, P.
name: Artamonov, A.
name: Artuso, M.
name: Aslanides, E.
name: Auriemma, G.
name: Baalouch, M.
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name: Batozskaya, V.
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name: Bay, A.
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name: Bellee, V.
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name: van Beuzekom, M.
name: Bifani, S.
name: Billoir, P.
name: Bird, T.
name: Birnkraut, A.
name: Bizzeti, A.
name: Blake, T.
name: Blanc, F.
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name: Blusk, S.
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name: Bowcock, T. J. V.
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name: Gomez, M. Calvo
name: Campana, P.
name: Perez, D. Campora
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Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: A proton-proton collision data sample, corresponding to an integrated luminosity of 3 fb$^{-1}$ collected by LHCb at $\sqrt{s}=7$ and 8 TeV, is used to reconstruct $63\pm9$ $Ω_b^-\toΩ_c^0π^-$, $Ω_c^0\to pK^-K^-π^+$ decays. Using the $Ξ_b^-\toΞ_c^0π^-$, $Ξ_c^0\to pK^-K^-π^+$ decay mode for calibration, the lifetime ratio and absolute lifetime of the $Ω_b^-$ baryon are measured to be \begin{align*} \frac{τ_{Ω_b^-}}{τ_{Ξ_b^-}} &amp;= 1.11\pm0.16\pm0.03, \\ τ_{Ω_b^-} &amp;= 1.78\pm0.26\pm0.05\pm0.06~{\rm ps}, \end{align*} where the uncertainties are statistical, systematic and from the calibration mode (for $τ_{Ω_b^-}$ only). A measurement is also made of the mass difference, $m_{Ω_b^-}-m_{Ξ_b^-}$, and the corresponding $Ω_b^-$ mass, which yields \begin{align*} m_{Ω_b^-}-m_{Ξ_b^-} &amp;= 247.4\pm3.2\pm0.5~{\rm MeV}/c^2, \\ m_{Ω_b^-} &amp;= 6045.1\pm3.2\pm 0.5\pm0.6~{\rm MeV}/c^2. \end{align*} These results are consistent with previous measurements.
description: 11 pages, 5 figures, All figures and tables, along with any supplementary material and additional information, are available at https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2016-008.html