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Disentangling $V_{ud}$ from New Physics in Beta Decays with the FCC-ee

Gialidi, Lemonia et al.
arXiv (All) · Papers
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high-energy-physics-phenomenology
Superallowed nuclear $β$-decays enable the most precise determination of the CKM element $V_{ud}$, but they are only sensitive to an effective combination of $V_{ud}$ and New Physics contributions to left-handed charged currents, which low-energy data alone cannot disentangle. Here we determine $V_{
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