Global Determination of $|V_{us}|$

Matthew Kirk, Danny van Dyk

In light of ongoing issues with the first-row unitarity test of the CKM matrix, we showcase a global fit to measurements of $K\to \ell \hat{I}½$, $K\to \ddot{I}€\ell \hat{I}½$, $\ddot{I}„\to K\hat{I}½$, and $τ\t…