Improved Ke3 radiative corrections sharpen the Kμ2–Kl3 discrepancy

Journal of High Energy Physics

Mikhail Gorchtein¹  Chien-Yeah Seng²  Daniel Galviz²  Ulf-G. Meißner³ 

[1] Helmholtz Institute Mainz, D-55099, Mainz, Germany;GSI Helmholtzzentrum für Schwerionenforschung, 64291, Darmstadt, Germany;Johannes Gutenberg University, D-55099, Mainz, Germany;Helmholtz-Institut für Strahlen- und Kernphysik and Bethe Center for Theoretical Physics, Universität Bonn, 53115, Bonn, Germany;Helmholtz-Institut für Strahlen- und Kernphysik and Bethe Center for Theoretical Physics, Universität Bonn, 53115, Bonn, Germany;Institute for Advanced Simulation, Institut für Kernphysik and Jülich Center for Hadron Physics, Forschungszentrum Jülich, 52425, Jülich, Germany;Tbilisi State University, 0186, Tbilisi, Georgia;

关键词: Kaon Physics;    Lattice QCD;    Precision QED;   

DOI  :  10.1007/JHEP11(2021)172

来源: Springer

【 摘 要 】

The measurements of Vus in leptonic (Kμ2) and semileptonic (Kl3) 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 Ke3 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 Kμ2–Kl3 discrepancy.

【 授权许可】

CC BY