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Near-physical point lattice calculation of isospin-breaking corrections to Kℓ2/πℓ2

Near-physical point lattice calculation of isospin-breaking corrections to Kℓ2/πℓ2
Near-physical point lattice calculation of isospin-breaking corrections to Kℓ2/πℓ2
In recent years, lattice determinations of non-perturbative quantities such as fK and fπ, which are relevant for Vus and Vud, have reached an impressive precision of O(1%) or better. To make further progress, electromagnetic and strong isospin breaking effects must be included in lattice QCD simulations.
We present the status of the RBC/UKQCD lattice calculation of isospin-breaking corrections to light meson leptonic decays. This computation is performed in a (2+1)-flavor QCD simulation using Domain Wall Fermions with near-physical quark masses. The isospin-breaking effects are implemented via a perturbative expansion of the action in α and (mu−md). In this calculation, we work in the electro-quenched approximation and the photons are implemented in the Feynman gauge and QEDL formulation.
hep-lat
Yong, Andrew Zhen Ning
4a143e5d-46aa-4f4e-a7ab-e6bb420b1335
Boyle, Peter
78a2aebf-aea7-4925-b5df-ead4b4da6fb2
Carlo, Matteo Di
fc48a2a5-d874-4f3a-843b-3f67da2845d5
Erben, Felix
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Gülpers, Vera
8547047e-ffc3-4a5a-8c75-22dd175ab1b2
Hansen, Maxwell T.
0dafd9c5-e339-47f2-8afb-91ab6d3ae39b
Harris, Tim
009daf5e-8ab9-4e5d-99ac-fc82a64e0da2
Hermansson-Truedsson, Nils
9d43bb05-729d-4f80-88e8-e578cf30e6d9
Hodgson, Raoul
cb45b3fd-1a5b-47a0-b4c1-693dba421469
Jüttner, Andreas
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Portelli, Antonin
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Richings, James
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Yong, Andrew Zhen Ning
4a143e5d-46aa-4f4e-a7ab-e6bb420b1335
Boyle, Peter
78a2aebf-aea7-4925-b5df-ead4b4da6fb2
Carlo, Matteo Di
fc48a2a5-d874-4f3a-843b-3f67da2845d5
Erben, Felix
13c8d276-fdde-43ce-8ab0-c71cbe5e2875
Gülpers, Vera
8547047e-ffc3-4a5a-8c75-22dd175ab1b2
Hansen, Maxwell T.
0dafd9c5-e339-47f2-8afb-91ab6d3ae39b
Harris, Tim
009daf5e-8ab9-4e5d-99ac-fc82a64e0da2
Hermansson-Truedsson, Nils
9d43bb05-729d-4f80-88e8-e578cf30e6d9
Hodgson, Raoul
cb45b3fd-1a5b-47a0-b4c1-693dba421469
Jüttner, Andreas
a90ff7c5-ae8f-4c8e-9679-b5a95b2a6247
Portelli, Antonin
a2526d4a-144e-4095-802a-229cddb10f0f
Richings, James
f8c385af-5869-4d31-a021-49df9959fdf0

[Unknown type: UNSPECIFIED]

Record type: UNSPECIFIED

Abstract

In recent years, lattice determinations of non-perturbative quantities such as fK and fπ, which are relevant for Vus and Vud, have reached an impressive precision of O(1%) or better. To make further progress, electromagnetic and strong isospin breaking effects must be included in lattice QCD simulations.
We present the status of the RBC/UKQCD lattice calculation of isospin-breaking corrections to light meson leptonic decays. This computation is performed in a (2+1)-flavor QCD simulation using Domain Wall Fermions with near-physical quark masses. The isospin-breaking effects are implemented via a perturbative expansion of the action in α and (mu−md). In this calculation, we work in the electro-quenched approximation and the photons are implemented in the Feynman gauge and QEDL formulation.

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2112.11823v2 - Author's Original
Available under License Creative Commons Attribution.
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Published date: 22 December 2021
Additional Information: 11 pages, 4 figures; Updated Author(s) metadata
Keywords: hep-lat
Learn more about Physics & Astronomy research Learn more about School of Physics and Astronomy research

Identifiers

Local EPrints ID: 469139
URI: http://eprints.soton.ac.uk/id/eprint/469139
DOI: doi:10.48550/arXiv.2112.11823
PURE UUID: e4e4e7d4-1589-4cfd-92fa-472425d6e0d7
ORCID for Andreas Jüttner: ORCID iD orcid.org/0000-0002-3978-0927
ORCID for Antonin Portelli: ORCID iD orcid.org/0000-0002-6059-917X

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Date deposited: 07 Sep 2022 17:37
Last modified: 17 Mar 2024 03:28

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Contributors

Author: Andrew Zhen Ning Yong
Author: Peter Boyle
Author: Matteo Di Carlo
Author: Felix Erben
Author: Vera Gülpers
Author: Maxwell T. Hansen
Author: Tim Harris
Author: Nils Hermansson-Truedsson
Author: Raoul Hodgson
Author: Andreas Jüttner ORCID iD
Author: Antonin Portelli ORCID iD
Author: James Richings

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