Renormalization of the Cabibbo-Kobayashi-Maskawa matrix

Abstract
Using the on-shell scheme and the general linear Rξ gauge we calculate the one-loop amplitude W+uIdj. In agreement with previous work, we show that the Cabibbo-Kobayashi-Maskawa (CKM) matrix ought to be renormalized. We show how to renormalize the CKM matrix and, at the same time, obtain a gauge-independent W decay amplitude.

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