May 25 – 30, 2020
Europe/Paris timezone
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Modified Lepton Couplings and the Cabibbo-Angle Anomaly

May 28, 2020, 6:45 PM
Theory poster Flavour physics Poster Session (I)


Mr Claudio Andrea Manzari (University of Zurich)


Recently, discrepancies of up to 4σ between the different determinations of the CKM element Vus have been observed. Modified neutrino couplings to Standard Model gauge bosons could explain this "Cabibbo-angle anomaly". However, this explanation necessarily affects also the EW fit and the other observables sensitive to LFU violation. Therefore, in order to assess the viability, a global fit of all experimental data is required. This poster provides an overview of the anomaly and shows the result of the model-independent global analysis. We find that modifications of lepton couplings significantly reduce the tensions in the Cabibbo angle and improve at the same time the agreement with the other data, resulting in an excellent fit.

Primary author

Mr Claudio Andrea Manzari (University of Zurich)

Presentation materials