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• W3099146144 abstract "A bstract We point out that testing the equality of the Cabibbo angle as extracted from Γ( K → πlν ), the ratio Γ( K → lν )/Γ( π → lν ) and nuclear β decays is not identical to a test of first row unitarity of the Cabibbo-Kobayashi-Maskawa (CKM) matrix. The reason is that a CKM unitarity test involves only two parameters, while the degrees of freedom for the assessment of the goodness-of-fit of the universality of the Cabibbo angle entailed by the Standard Model (SM) is equal to the number of measurements minus one. Beyond the SM all different processes could in principle give different Cabibbo angles. Consequently, the difference between the two tests becomes relevant starting from three observables giving results for the Cabibbo angle that are in tension with each other. With current data, depending on the treatment of the nuclear β decays, we find that New Physics is favored over the SM at 5 . 1 σ or 3 . 6 σ while CKM unitarity is rejected at 4 . 8 σ or 3 . 0 σ , respectively. We argue that the best method to test the SM is to test the equality of the Cabibbo angle, because CKM unitarity is only one aspect of the SM." @default.
• W3099146144 created "2020-11-23" @default.
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• W3099146144 date "2020-07-01" @default.
• W3099146144 modified "2023-10-02" @default.
• W3099146144 title "On the statistical treatment of the Cabibbo angle anomaly" @default.
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• W3099146144 doi "https://doi.org/10.1007/jhep07(2020)068" @default.
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