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The analysis of hyperon semi-leptonic decay data is addressed with referenceto SU(3) breaking and isospin mixing between Lambda^O and Sigma^O. Variousapproaches to SU(3) breaking are discussed and compared. The phenomenologicalimplications of Lambda^0-Sigma^0 mixing are not to be underestimated: it caninduce vector couplings in decays otherwise purely axial and may also modifyrates. In regard of the KTeV data on Xi^0O -> Sigma^+ e antineutrino,predictions are presented and the impact of present a future data on theextraction of F and D is also examined. In addition, the implications of thenew data for the use of octet baryon beta decays in determining V_us areconsidered.Comment: 5 pages, uses aipproc.cls, aipproc.sty (included), axodraw.sty,  cite.sty. Presented at SPIN 2000 (Osaka, Oct. 2000

Hyperon beta-decay analysis and the recent KTeV data