SU(3)--Breaking Effects in Axial--Vector Couplings of Octet Baryons

Present evidence on baryon axial–vector couplings is reviewed, the main emphasis being on internal consistency between asymmetry and rate data. A complete account of all {\sl small} terms in the Standard Model description of these latter leads to {\sl both} consistency {\sl and} evidence for breaking of flavour SU(3) in the axial couplings of octet baryons. Talk presented at “5th Int. Sympos. on Meson–Nucleon Physics and the Structure of the Nucleon”, Boulder, CO, sept. 1993. To be published in $\pi N$ Newsletter.