Relative sign of strangeness-changing axial-vector and vector currents

The determination of the relative sign of strangeness-changing hadronic axial-vector and vector currents is considered within the framework of V, A theory and the experimental information on hyperon beta decays, in particular the spin correlation parameters for Λ→peν. If the sign of the Λ polarization is accepted as obtained from nonleptonic decay experiments, the V+A form of the current is excluded. If the polarization sign is assumed to be the opposite, a necessary condition for the consistency of the correlation parameters for Λ→peν with V, A theory is the presence of very large tensor and/or axial-tensor form factors. Explicit fits to the data allowing for such form factors have very small probabilities. It is concluded that the consistency of the experimental results with V, A theory strongly supports the polarization sign as inferred from Λ→pπ, and hence, the V-A form of the |Δ S|=1 current.