Speaker
Description
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 of O(1%) or better. To make further progress, electromagnetic and strong isospin breaking effects must be included in lattice QCD simulations.
We present the status of the RBC&UKQCD lattice calculation of isospin-breaking corrections to light meson leptonic decays. This computation is performed in a (2+1)-flavor QCD+QED using Domain Wall Fermions with near-physical quark masses. The QED effects are implemented via a perturbative expansion of the action in $\alpha$. In this calculation, we work in the electro-quenched approximation and the photons are implemented in the Feynman gauge and QEDL formulation.
