Isospin-breaking corrections to light leptonic decays in lattice QCD+QED at the physical point
| Autor: | Nils Hermansson-Truedsson, Peter Boyle, Matteo Di Carlo, Felix Erben, Vera Gülpers, Maxwell Hansen, Tim Harris, Raoul Hodgson, Andreas Jüttner, Fionn Ó hÓgáin, Antonin Portelli, James Richings, Andrew Zhen Ning Yong |
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| Jazyk: | angličtina |
| Rok vydání: | 2022 |
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| Popis: | We report on the physical-point RBC/UKQCD calculation of the leading isospin-breaking corrections to light-meson leptonic decays. This is highly relevant for future precision tests in the flavour physics sector, in particular the first-row unitarity of the Cabibbo-Kobayashi-Maskawa matrix containing the elements $V_{us}$ and $V_{ud}$. The simulations were performed using Domain-Wall fermions for $2+1$ flavours, and with isospin-breaking effects included perturbatively in the path integral through order $\alpha$ and $(m_u - m_d)/\Lambda _{\mathrm{QCD}}$. We use QED$_{\mathrm{L}}$ for the inclusion of electromagnetism, and discuss here the non-locality of this prescription which has significant impact on the infinite-volume extrapolation. Comment: Proceedings for The 39th International Symposium on Lattice Field Theory, 8th-13th August, 2022, Rheinische Friedrich-Wilhelms-Universit\"at Bonn, Bonn, Germany |
| Databáze: | OpenAIRE |
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