Abstract
Analysis of superallowed Fermi beta decay using a new approach to the nuclear mismatch factor and evaluation of the radiative corrections using renormalization group methods and including nuclear-structure-dependent terms in the “inner” radiative correction leads to | V ud| 2+| V us| 2+| V ub| 2 = 0.9999 ± 0.0012 for the first row of the Kobayashi-Maskawa matrix using a mass of 130 GeV for the top quark. We may, alternatively, assuming unitarity of the KM matrix, infer a top quark mass of (1.40±80) GeV from beta-decay data alone.
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