Abstract
We construct several classes of hadronic matrix elements and relate them to the low-energy constants in Chiral Perturbation Theory that describe the electromagnetic effects in the semileptonic beta decay of the pion and the kaon. We propose to calculate them using lattice QCD, and argue that such a calculation will make an immediate impact to a number of interesting topics at the precision frontier, including the outstanding anomalies in |Vus| and the top-row Cabibbo-Kobayashi-Maskawa matrix unitarity.
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Seng, CY., Feng, X., Gorchtein, M. et al. New method for calculating electromagnetic effects in semileptonic beta-decays of mesons. J. High Energ. Phys. 2020, 179 (2020). https://doi.org/10.1007/JHEP10(2020)179
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DOI: https://doi.org/10.1007/JHEP10(2020)179