Journal
PHYSICS LETTERS B
Volume 820, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.physletb.2021.136522
Keywords
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Funding
- DFG [196253076-TRR 110]
- NSFC [11621131001]
- Alexander von Humboldt Foundation through the Humboldt Research Fellowship
- Chinese Academy of Sciences (CAS) through a President's International Fellowship Initiative (PIFI) [2018DM0034]
- Volkswagen-Stiftung [93562]
- EU Horizon 2020 research and innovation programme, STRONG-2020 project [824093]
- German-Mexican research col-laboration [278017, SP 778/4-1]
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This study reports a high-precision calculation of the Standard Model electroweak radiative corrections, revealing an anomaly in the determination of V-us, and suggests that the electroweak effects cannot account for this anomaly.
We report a high-precision calculation of the Standard Model electroweak radiative corrections in the K -> pi e(+)nu(gamma) decay as a part of the combined theory effort to understand the existing anomaly in the determinations of V-us. Our new analysis features a chiral resummation of the large infrared-singular terms in the radiative corrections and a well-under-control strong interaction uncertainty based on the most recent lattice QCD inputs. While being consistent with the current state-of-the-art results obtained from chiral perturbation theory, we reduce the existing theory uncertainty from 10(-3) to 10(-4.) Our result suggests that the Standard Model electroweak effects cannot account for the V-us anomaly. (C) 2021 The Author(s). Published by Elsevier B.V.
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