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• W2023289984 abstract "Determinations of $|{V}_{ud}|$ and $|{V}_{us}|$ along with their implications for the unitarity test $|{V}_{ud}{|}^{2}+|{V}_{us}{|}^{2}+|{V}_{ub}{|}^{2}=1$ are discussed. The leading two-loop radiative corrections to neutron $ensuremath{beta}$ decay are evaluated and used to derive a refined relationship $|{V}_{ud}{|}^{2}{ensuremath{tau}}_{n}(1+3{g}_{A}^{2})=4908(4)text{ }mathrm{s}$. Employing $|{V}_{ud}|=0.9740(5)$ from superallowed nuclear decays and the measured neutron lifetime ${ensuremath{tau}}_{n}=885.7(7)text{ }mathrm{s}$ leads to the precise prediction ${g}_{A}=1.2703(8)$ which is compared with current direct experimental values. Various extractions of $|{V}_{us}|$ are described and updated. The long accepted Particle Data Group value of $|{V}_{us}|$ from fitted ${K}_{e3}$ decay rates suggests a deviation from CKM unitarity but it is contradicted by more recent experimental results which confirm unitarity with good precision. An outlook for possible future advances is given." @default.
• W2023289984 created "2016-06-24" @default.
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• W2023289984 date "2004-11-11" @default.
• W2023289984 modified "2023-10-17" @default.
• W2023289984 title "Precision measurements and CKM unitarity" @default.
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• W2023289984 doi "https://doi.org/10.1103/physrevd.70.093006" @default.
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