Near-Physical Point Lattice Calculation of Isospin-Breaking Corrections to $K_{\ell 2}/{\pi }_{\ell 2}$

Andrew Zhen Ning Yong, Peter Boyle, Matteo Di Carlo +9

In recent years, lattice determinations of non-perturbative quantities such as $f_K$ and $f_{\pi }$, which are relevant for $V_{us}$ and $V_{ud}$, have reached an impressive precision o…