Abstract
The most recent data for semileptonic hyperon decays are compared with the Cabibbo theory. Two significant deviations from the Cabibbo-theory predictions have been observed. The deviation for GAMMA in ..sigma../sup -/..--> lambda..e..nu.. can be the signal of the symmetry breaking. The discrepancy for ..cap alpha../sub e/ in ..sigma../sup -/..-->..ne..nu.. cannot be explained by the first-order symmetry breaking or by admixture of higher representations in the axial-vector current.
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