Journal Article

FZJ-2021-00171

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png A new theory framework for the electroweak radiative corrections in Kl3 decays

Seng, C.-Y. (Corresponding author) ; Galviz, D. ; Meißner, U.-G.FZJ*

2020
SISSA [Trieste]

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Please use a persistent id in citations: http://hdl.handle.net/2128/26765  doi:10.1007/JHEP02(2020)069

Abstract: We propose a new theory framework to study the electroweak radiative corrections in Kl3 decays by combining the classic current algebra approach with the modern effective field theory. Under this framework, the most important O(GFα) radiative corrections are described by a single tensor Tμν involving the time-ordered product between the charged weak current and the electromagnetic current, and all remaining pieces are calculable order-by-order in Chiral Perturbation Theory. We further point out a special advantage in the K0l3 channel that it suffers the least impact from the poorly-constrained low-energy constants. This finding may serve as a basis for a more precise extraction of the matrix element Vus in the future.

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Contributing Institute(s):

1. Theorie der Starken Wechselwirkung (IAS-4)
2. Theorie der starken Wechselwirkung (IKP-3)

Research Program(s):

1. 511 - Computational Science and Mathematical Methods (POF3-511) (POF3-511)
2. DFG project 196253076 - TRR 110: Symmetrien und Strukturbildung in der Quantenchromodynamik (196253076) (196253076)

Appears in the scientific report 2020

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