Precision measurement of the ratio of the ${\Lambda }_b^0$ to ${\overline{B}}^0$ lifetimes

Abstract

The LHCb measurement of the lifetime ratio of the ${\Lambda }_b^0$ to the ${\overline{B}}^0$ meson is updated using data corresponding to an integrated luminosity of 3.0 fb${}^{-1}$ collected using 7 and 8 TeV centre-of-mass energy $pp$ collisions at the LHC. The decay modes used are ${\overline{B}}^0\to J/\psi p{K}^{-}$ and ${\overline{B}}^0\to J/\psi {\pi }^{+}{K}^{-}$, where the ${\pi }^{+}{K}^{-}$ mass is consistent with that of the ${\overline{K}}^{\ast 0}(892)$ meson. The lifetime ratio is determined with unprecedented precision to be $0.974\pm 0.006\pm 0.004$, where the first uncertainty is statistical and the second systematic. This result is in agreement with original theoretical predictions based on the heavy quark expansion. Using the current world average of the ${\overline{B}}^0$ lifetime, the ${\Lambda }_b^0$ lifetime is found to be $1.479\pm 0.009\pm 0.010$ ps.

11 pages, 6 figures; version 2 after response to referee, v3 minor corrections

References in corpus (3)

• The CKM Matrix and the Unitarity Triangle
• Measurements of the $B^{+}$, $B^0$, $B_s^0$ meson and ${\Lambda }_b^0$ baryon lifetimes
• Measurement of b hadron lifetimes in exclusive decays containing a J/psi in p-pbar collisions at sqrt(s)=1.96TeV

Cited by in corpus (31)

• Averages of $b$-hadron, $c$-hadron, and $\tau$-lepton properties as of summer 2016
• Observation of $J/\psi p$ resonances consistent with pentaquark states in ${\Lambda }_b^0\to J/\psi K^{-}p$ decays
• Exotics: Heavy Pentaquarks and Tetraquarks
• Observation of the rare $B_s^0\to {\mu }^{+}{\mu }^{-}$ decay from the combined analysis of CMS and LHCb data
• 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 ${\Xi }_{cc}^{++}$
• On the ultimate precision of meson mixing observables
• Measurement of the resonant and CP components in ${\overline{B}}^0\to J/\psi {\pi }^{+}{\pi }^{-}$ decays
• Study of the kinematic dependences of ${\Lambda }_b^0$ production in $pp$ collisions and a measurement of the ${\Lambda }_b^0\to {\Lambda }_c^{+}{\pi }^{-}$ branching fraction
• Precision measurement of the mass and lifetime of the ${\Xi }_b^0$ baryon
• Observation of the ${\Lambda }_b^0\to J/\psi p{\pi }^{-}$ decay
• Measurement of the lifetime of the $B_c^{+}$ meson using the $B_c^{+}\to J/\psi {\pi }^{+}$ decay mode
• Precision measurement of the mass and lifetime of the Xi_b^- baryon
• Observations of ${\Lambda }_b^0\to \Lambda K^{+}{\pi }^{-}$ and ${\Lambda }_b^0\to \Lambda K^{+}{K}^{-}$ decays and searches for other ${\Lambda }_b^0$ and ${\Xi }_b^0$ decays to $\Lambda h^{+}{h}^{\prime -}$ final states
• Evidence for the strangeness-changing weak decay ${\Xi }_b^{-}\to {\Lambda }_b^0{\pi }^{-}$
• Observation of ${\Lambda }_b^0\to \psi (2S)p{K}^{-}$ and ${\Lambda }_b^0\to J/\psi {\pi }^{+}{\pi }^{-}p{K}^{-}$ decays and a measurement of the ${\Lambda }_b^0$ baryon mass
• Heavy baryons as polarimeters at colliders
• Measurement of CP asymmetry in $B_s^0\to D_s^{\mp }{K}^{\pm }$ decays
• Observation of the ${\Xi }_b^{-}\to J/\psi \Lambda K^{-}$ decay
• Measurement of the mass and lifetime of the ${\Omega }_b^{-}$ baryon
• Measurement of the ${\Xi }_b^{-}$ and ${\Omega }_b^{-}$ baryon lifetimes
• Measurement of the $B_s^0$ meson lifetime in $D_s^{+}{\pi }^{-}$ decays
• Axial-Vector Emitting Weak Nonleptonic Deacys of ${\Omega }_c^0$ Baryon
• Heavy Flavour Physics at the LHC
• The decays ${\Xi }_b\to {\Lambda }_b\pi$ and diquark correlations in hyperons
• Observation of the ${\Lambda }_{\mathrm{b}}^0$ $\to$ J/$\psi \Lambda \varphi$ decay in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Update on splitting of lifetimes of $c$ and $b$ hyperons within the heavy quark expansion and decays ${\Xi }_Q\to {\Lambda }_Q\pi$
• Lifetimes of some $b$-flavored hadrons
• Observation of the $B_s^0\to J/\psi K_{\mathrm{S}}^0{K}^{\pm }{\pi }^{\mp }$ decay
• b and c hadron spectroscopy at LHCb