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• W2275802019 abstract "We calculate the kaon semileptonic form factor $f_+(0)$ from lattice QCD, working, for the first time, at the physical light-quark masses. We use gauge configurations generated by the MILC collaboration with $N_f=2+1+1$ flavors of sea quarks, which incorporate the effects of dynamical charm quarks as well as those of up, down, and strange. We employ data at three lattice spacings to extrapolate to the continuum limit. Our result, $f_+(0) = 0.9704(32)$, where the error is the total statistical plus systematic uncertainty added in quadrature, is the most precise determination to date. Combining our result with the latest experimental measurements of $K$ semileptonic decays, one obtains the Cabibbo-Kobayashi-Maskawa matrix element $|V_{us}|=0.22290(74)(52)$, where the first error is from $f_+(0)$ and the second one is from experiment. In the first-row test of Cabibbo-Kobayashi-Maskawa unitarity, the error stemming from $|V_{us}|$ is now comparable to that from $|V_{ud}|$." @default.
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• W2275802019 date "2014-03-17" @default.
• W2275802019 modified "2023-10-03" @default.
• W2275802019 title "Determination of<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mo stretchy=false>|</mml:mo><mml:msub><mml:mi>V</mml:mi><mml:mrow><mml:mi>u</mml:mi><mml:mi>s</mml:mi></mml:mrow></mml:msub><mml:mo stretchy=false>|</mml:mo></mml:math>from a Lattice QCD Calculation of the<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mi>K</mml:mi><mml:mo stretchy=false>→</mml:mo><mml:mi>π</mml:mi><mml:mo>ℓ</mml:mo><mml:mi>ν</mml:mi></mml:math>…" @default.
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• W2275802019 doi "https://doi.org/10.1103/physrevlett.112.112001" @default.
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