Structure-dependent QED effects in leptonic decays on the lattice

by Matteo Di Carlo

Tuesday 1 Nov 2022, 16:00 → 18:00 Europe/Zurich

4/2-037 - TH meeting room (CERN)

The decreasing uncertainty in the experimental measurements of several hadronic observables related to weak processes, which in many cases is smaller than O(1%), requires theoretical calculations to include subleading corrections that were neglected so far. In this talk we present the first RBC-UKQCD lattice calculation of the isospin-breaking corrections to the ratio of leptonic decay rates of kaons and pions into muons. The inclusion of long-distance QED interactions on the lattice produces sizeable structure-dependent finite-volume corrections, and the relevant role of these effects in the high-precision determination of leptonic decay rates will be discussed.