Sep 5 – 10, 2021
Europe/Lisbon timezone

Structure-dependent electromagnetic finite-size effects on the lattice (17+3)

Sep 8, 2021, 3:35 PM


Talk Flavour physics - CKM and beyond Flavour physics - CKM and beyond


Nils Hermansson-Truedsson (Universität Bern)


The systematic effect associated to the finite-volume constraint in lattice calculations has to be corrected for in order to make physical predictions and from these precision tests of the Standard Model. For (sub-)per cent precision one has to include also electromagnetic effects on the lattice, which can lead to particularly large finite-size effects. The finite-size scaling depends not only on properties such as particle masses, but also on structure-dependent form-factors. Examples of the latter are the electromagnetic charge radii of pions and kaons. In this talk we present how to analytically derive these electromagnetic finite-size effects in a relativistic, model-independent and systematic approach, with particular focus on leptonic decays of pions and kaons. The finite-size scaling in leptonic decays allows for improved numerical control in extractions of light-quark CKM-matrix elements from lattice simulations.

Primary author

Nils Hermansson-Truedsson (Universität Bern)


Dr Antonin Portelli (University of Edinburgh) Dr Matteo Di Carlo (University of Edinburgh) Dr Maxwell Hansen (University of Edinburgh)

Presentation materials