Precision measurement of the $$B^{0}$$ meson lifetime using $$B^{0}\rightarrow J/\psi K^{{* 0}}$$ decays with the ATLAS detector

Abstract A measurement of the $$B^{0}$$ B 0 meson lifetime using $$ B^{0} \rightarrow J/\psi K^{*0} $$ B 0 → J / ψ K ∗ 0 decays in data from 13 $$\text {TeV}$$ TeV proton–proton collisions with an integrated luminosity of $$ 140~\mathrm {fb^{-1}} $$ 140 fb - 1 recorded by the ATLAS detector at the LHC is presented. The measured effective lifetime is $$ \tau = 1.5053\pm 0.0012~\mathrm {(stat.)} \pm 0.0035~\mathrm {(syst.)~ps}. $$ τ = 1.5053 ± 0.0012 ( stat . ) ± 0.0035 ( syst . ) ps . The average decay width extracted from the effective lifetime, using parameters from external sources, is $$\begin{aligned} \Gamma _d = 0.6639\pm 0.0005~\mathrm {(stat.)} \pm 0.0016~\mathrm {(syst.)}\\ \pm 0.0038~\text {(ext.)} \text {~ps}^{-1}, \end{aligned}$$ Γ d = 0.6639 ± 0.0005 ( stat . ) ± 0.0016 ( syst . ) ± 0.0038 (ext.) ps - 1 , where the uncertainties are statistical, systematic and from external sources. The earlier ATLAS measurement of $$\Gamma _s$$ Γ s in the $$B^{0}_{s} \rightarrow J/\psi \phi $$ B s 0 → J / ψ ϕ

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