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The determination of the Kobayashi-Maskawa matrix element Vᵤₛ from hyperon {β} decays has long had a hidden uncertainty due to the almost universal assumption of SU(3) invariance in Cabibbo-type fits, especially since the data definitely indicate the presence of SU(3) breaking. We have reanalyzed the hyperon-decay data using the pattern of symmetry breaking predicted by the quark model including the center-of-mass correction. We find that the SU(3)-broken picture is far superior to the assumption of perfect SU(3), and provides a good fit to experiment. The sensitivity of Vᵤₛ to the breaking is not large and we find Vᵤₛ=0.220±{}0.001±{}0.003 (the errors are experimental and theoretical, respectively), in agreement with the results from kaon decay by Leutwyler and Roos.
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Donoghue et al. (1987) studied this question.
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