A tension in the unitarity of the first-row of the CKM matrix has emerged in recent years. This "Cabibbo anomaly" has motivated a renewed scrutiny of the QED corrections applied to low-energy precision beta decays.
In this talk I will explain how this problem can be formalized in effective field theory, ultimately descending to a heavy-quark-like effective theory of point-like nuclei. I will outline recent progress on the control of high order QED corrections in this point-like theory, including an understanding of the all-orders structure for the Z-enhanced Coulomb-corrections, and comment on implications for the extraction of |V_{ud}| and the interpretation of beta-decay experiments.
Ryan Plestid (CERN): Heavy particle EFT methods for precision beta decays
Location:
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- Plestid_25_November_2025.pdf 198 KB
