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- W4284885199 abstract "The Cabibbo-Cobayashi-Maskawa (CKM) matrix parametrizes the misalignement between the up- and down-quark mass basis in the Standard Model (SM). The observation of first row CKM unitarity violation has recently emerged as a new anomaly of the SM, known as the Cabibbo Angle Anomaly (CAA). With current measurements, comparing the elements $V_{ud}$ and $V_{us}$ extracted from beta and kaon decays respectively, the tension with the SM prediction amounts to $sim$$3,sigma$. Recently, it has been pointed out that this anomaly can also be seen as a discrepancy in the determination of the Fermi constant from muon decay vs $beta$ and K decays, once CKM unitarity is assumed. In fact, possible explanations in terms on New Physics fall under two broad classes: contributions to $beta$ decay and/or to $mu$ decay. In this proceedings, we discuss these solutions in terms of gauge invariant dimension 6 operators in SMEFT and simplified extensions of the Standard Model. The latter could introduce correlations with other anomalies in the SM, pointing to new and interesting directions for model building." @default.
- W4284885199 created "2022-07-09" @default.
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- W4284885199 date "2021-11-08" @default.
- W4284885199 modified "2023-09-30" @default.
- W4284885199 title "Explaining the Cabibbo Angle Anomaly" @default.
- W4284885199 doi "https://doi.org/10.48550/arxiv.2111.04519" @default.
- W4284885199 hasPublicationYear "2021" @default.
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