Isospin-breaking corrections to light-meson leptonic decays from lattice simulations at physical quark masses

by Dr Matteo Di Carlo (University of Edinburgh)

Monday 12 Dec 2022, 13:00 → 14:00 Europe/Berlin

1.007 (IRIS)

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, evaluated using the $\mathrm{QED_L}$ prescription, produces sizeable structure-dependent finite-volume corrections. The relevant role of these effects in the high-precision determination of leptonic decay rates will be discussed.

Berlin2022_mdc.pdf