Improved K e3 radiative corrections sharpen the K μ2–K l3 discrepancy

Abstract The measurements of V us in leptonic (K μ2) and semileptonic (K l3) kaon decays exhibit a 3σ disagreement, which could originate either from physics beyond the Standard Model or some large unidentified Standard Model systematic effects. Clarifying this issue requires a careful examination o...

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Autores principales:	Chien-Yeah Seng, Daniel Galviz, Mikhail Gorchtein, Ulf-G. Meißner
Formato:	article
Lenguaje:	EN
Publicado:	SpringerOpen 2021
Materias:	Kaon Physics Lattice QCD Precision QED Nuclear and particle physics. Atomic energy. Radioactivity QC770-798
Acceso en línea:	https://doaj.org/article/93eb4681f22643889a033da9c5ae42c1
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spelling	oai:doaj.org-article:93eb4681f22643889a033da9c5ae42c12021-12-05T12:25:17ZImproved K e3 radiative corrections sharpen the K μ2–K l3 discrepancy10.1007/JHEP11(2021)1721029-8479https://doaj.org/article/93eb4681f22643889a033da9c5ae42c12021-11-01T00:00:00Zhttps://doi.org/10.1007/JHEP11(2021)172https://doaj.org/toc/1029-8479Abstract The measurements of V us in leptonic (K μ2) and semileptonic (K l3) kaon decays exhibit a 3σ disagreement, which could originate either from physics beyond the Standard Model or some large unidentified Standard Model systematic effects. Clarifying this issue requires a careful examination of all existing Standard Model inputs. Making use of a newly-proposed computational framework and the most recent lattice QCD results, we perform a comprehensive re-analysis of the electroweak radiative corrections to the K e3 decay rates that achieves an unprecedented level of precision of 10 −4, which improves the current best results by almost an order of magnitude. No large systematic effects are found, which suggests that the electroweak radiative corrections should be removed from the “list of culprits” responsible for the K μ2–K l3 discrepancy.Chien-Yeah SengDaniel GalvizMikhail GorchteinUlf-G. MeißnerSpringerOpenarticleKaon PhysicsLattice QCDPrecision QEDNuclear and particle physics. Atomic energy. RadioactivityQC770-798ENJournal of High Energy Physics, Vol 2021, Iss 11, Pp 1-43 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Kaon Physics Lattice QCD Precision QED Nuclear and particle physics. Atomic energy. Radioactivity QC770-798
spellingShingle	Kaon Physics Lattice QCD Precision QED Nuclear and particle physics. Atomic energy. Radioactivity QC770-798 Chien-Yeah Seng Daniel Galviz Mikhail Gorchtein Ulf-G. Meißner Improved K e3 radiative corrections sharpen the K μ2–K l3 discrepancy
description	Abstract The measurements of V us in leptonic (K μ2) and semileptonic (K l3) kaon decays exhibit a 3σ disagreement, which could originate either from physics beyond the Standard Model or some large unidentified Standard Model systematic effects. Clarifying this issue requires a careful examination of all existing Standard Model inputs. Making use of a newly-proposed computational framework and the most recent lattice QCD results, we perform a comprehensive re-analysis of the electroweak radiative corrections to the K e3 decay rates that achieves an unprecedented level of precision of 10 −4, which improves the current best results by almost an order of magnitude. No large systematic effects are found, which suggests that the electroweak radiative corrections should be removed from the “list of culprits” responsible for the K μ2–K l3 discrepancy.
format	article
author	Chien-Yeah Seng Daniel Galviz Mikhail Gorchtein Ulf-G. Meißner
author_facet	Chien-Yeah Seng Daniel Galviz Mikhail Gorchtein Ulf-G. Meißner
author_sort	Chien-Yeah Seng
title	Improved K e3 radiative corrections sharpen the K μ2–K l3 discrepancy
title_short	Improved K e3 radiative corrections sharpen the K μ2–K l3 discrepancy
title_full	Improved K e3 radiative corrections sharpen the K μ2–K l3 discrepancy
title_fullStr	Improved K e3 radiative corrections sharpen the K μ2–K l3 discrepancy
title_full_unstemmed	Improved K e3 radiative corrections sharpen the K μ2–K l3 discrepancy
title_sort	improved k e3 radiative corrections sharpen the k μ2–k l3 discrepancy
publisher	SpringerOpen
publishDate	2021
url	https://doaj.org/article/93eb4681f22643889a033da9c5ae42c1
work_keys_str_mv	AT chienyeahseng improvedke3radiativecorrectionssharpenthekm2kl3discrepancy AT danielgalviz improvedke3radiativecorrectionssharpenthekm2kl3discrepancy AT mikhailgorchtein improvedke3radiativecorrectionssharpenthekm2kl3discrepancy AT ulfgmeißner improvedke3radiativecorrectionssharpenthekm2kl3discrepancy
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Improved K e3 radiative corrections sharpen the K μ2–K l3 discrepancy

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