Feb 15 – 17, 2023
Università di Pisa - Dipartimento di Fisica
Europe/Rome timezone

Light-meson leptonic decay rates from lattice QCD+QED calculations

Feb 16, 2023, 3:40 PM
20m
Aula Magna - Dipartimento di Fisica (Università di Pisa - Dipartimento di Fisica)

Aula Magna - Dipartimento di Fisica

Università di Pisa - Dipartimento di Fisica

Largo Bruno Pontecorvo 3, I-56127, Pisa, Italy

Speaker

Matteo Di Carlo (University of Edinburgh)

Description

The decreasing uncertainties in theoretical predictions and experimental measurements of several hadronic observables related to weak processes, which in many cases are now smaller than O(1%), require theoretical calculations to include subleading corrections that were neglected so far. Precise determinations of leptonic and semi-leptonic decay rates, including $\text{QED}$ and strong isospin-breaking effects, can play a central role in solving the current tensions in the first-row unitarity of the $\text{CKM}$ matrix. In this talk we discuss the recent progress on lattice calculations of isospin-breaking corrections to leptonic decay rates of pseudoscalar mesons, presenting new results by the $\text{RBC/UKQCD}$ collaboration. The inclusion of long-distance $\text{QED}$ interactions on the lattice, evaluated using the $\text{QED}_\text{L}$ prescription, produces sizeable finite-volume corrections. The relevant role of these effects in the high-precision determination of leptonic decay rates will be discussed, along with prospects for future improvement.

Presentation materials