Determination of $|V_{us}|$ from a lattice-QCD calculation of the $K\to \pi \ell \nu$ semileptonic form factor with physical quark masses

A. Bazavov, C. Bernard, C. Bouchard +21

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…