Measurement of the mass and lifetime of the ${\Omega }_b^{-}$ baryon

Abstract

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 $63\pm 9$ ${\Omega }_b^{-}\to {\Omega }_c^0{\pi }^{-}$, ${\Omega }_c^0\to p{K}^{-}{K}^{-}{\pi }^{+}$ decays. Using the ${\Xi }_b^{-}\to {\Xi }_c^0{\pi }^{-}$, ${\Xi }_c^0\to p{K}^{-}{K}^{-}{\pi }^{+}$ decay mode for calibration, the lifetime ratio and absolute lifetime of the ${\Omega }_b^{-}$ baryon are measured to be \begin{align*} \frac{τ_{Ω_b^-}}{τ_{Ξ_b^-}} &= 1.11\pm0.16\pm0.03, \\ τ_{Ω_b^-} &= 1.78\pm0.26\pm0.05\pm0.06~{\rm ps}, \end{align*} where the uncertainties are statistical, systematic and from the calibration mode (for ${\tau }_{{\Omega }_b^{-}}$ only). A measurement is also made of the mass difference, $m_{{\Omega }_b^{-}}-m_{{\Xi }_b^{-}}$, and the corresponding ${\Omega }_b^{-}$ mass, which yields \begin{align*} m_{Ω_b^-}-m_{Ξ_b^-} &= 247.4\pm3.2\pm0.5~{\rm MeV}/c^2, \\ m_{Ω_b^-} &= 6045.1\pm3.2\pm 0.5\pm0.6~{\rm MeV}/c^2. \end{align*} These results are consistent with previous measurements.

arXiv comment11 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

References in corpus (26)

• PYTHIA 6.4 Physics and Manual
• PYTHIA 6.2 Physics and Manual
• A Brief Introduction to PYTHIA 8.1
• LHCb Detector Performance
• PHOTOS Monte Carlo: a precision tool for QED corrections in Z and W decays
• TMVA - Toolkit for Multivariate Data Analysis
• The LHCb Trigger and its Performance in 2011
• Performance of the LHCb RICH detector at the LHC
• Nonperturbative Corrections to Inclusive Beauty and Charm Decays: QCD versus Phenomenological Models
• Efficient, reliable and fast high-level triggering using a bonsai boosted decision tree
• The Rule of Discarding $1/N_c$ in Inclusive Weak Decays
• Measurement of the Λ_b^0, Ξ_b^- and Ω_b^- baryon masses
• The Rule of Discarding $1/N_c$ in Inclusive Weak Decays. II
• Observation of the doubly strange b baryon Omega_b-
• Precision measurement of D meson mass differences
• Precision measurement of the ratio of the ${\Lambda }_b^0$ to ${\overline{B}}^0$ lifetimes
• Precision measurement of the mass and lifetime of the ${\Xi }_b^0$ baryon
• Studies of beauty baryon decays to $D^{0}p{h}^{-}$ and ${\Lambda }_c^{+}{h}^{-}$ final states
• B Decays and the Heavy-Quark Expansion
• A Phenomenological Analysis of Heavy Hadron Lifetimes
• Precision measurement of the mass and lifetime of the Xi_b^- baryon
• Mass and lifetime measurements of bottom and charm baryons in $p\bar{p}$ collisions at $\sqrt{s}= 1.96 TeV
• The QCD Perspective on Lifetimes of Heavy-Flavour Hadrons
• Heavy quark expansion in beauty and its decays
• Measurement of the ${\Xi }_b^{-}$ and ${\Omega }_b^{-}$ baryon lifetimes
• New Possibility of Solving the Problem of Lifetime Ratio $\tau ({\Lambda }_b)/\tau (B_d)$

Cited by in corpus (13)

• Averages of $b$-hadron, $c$-hadron, and $\tau$-lepton properties as of summer 2016
• Averages of $b$-hadron, $c$-hadron, and $\tau$-lepton properties as of 2018
• Averages of $b$-hadron, $c$-hadron, and $\tau$-lepton properties as of 2021
• Measurement of the lifetime of the doubly charmed baryon ${\Xi }_{cc}^{++}$
• First measurements of absolute branching fractions of ${\Xi }_c^0$ at Belle
• Observation of excited ${\Omega }_c^0$ baryons in ${\Omega }_b^{-}\to {\Xi }_c^{+}{K}^{-}{\pi }^{-}$ decays
• Mass Spectra and Decay Properties of Singly Heavy Bottom-Strange Baryons
• ${\mathbf{\Omega }}_{\mathbf{b}}^{-}\to ({\mathbf{\Xi }}_{\mathbf{c}}^{+}{\mathbf{K}}^{-}){\mathbf{\pi }}^{-}$ and the ${\mathbf{\Omega }}_{\mathbf{c}}$ states
• Screening of quark charge and mixing effects on transition moments and M1 decay widths of baryons
• Observation of the decay ${\Xi }_b^{-}\to p{K}^{-}{K}^{-}$
• Restudy of the color-allowed two-body nonleptonic decay of bottom baryons ${\Xi }_b$ and ${\Omega }_b$ supported by hadron spectroscopy
• Measurement of the mass difference and relative production rate of the ${\Omega }_b^{-}$ and ${\Xi }_b^{-}$ baryons
• A $b$-baryon sonata