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Existing analyzes of baryon semileptonic decays indicate the presence of asmall SU(3) symmetry breaking in hyperon semileptonic decays, but to provideevidence for SU(3) symmetry breaking, one would need a relation similar to theGell-Mann--Okubo (GMO) baryon mass formula which is satisfied to a fewpercents, showing evidence for a small SU(3) symmetry breaking effect in theGMO mass formula. In this talk, I would like to present a similar GMO relationobtained in a recent work for hyperon semileptonic decay axial vector currentmatrix elements. Using these generalized GMO relations for the measured axialvector current to vector current form factor ratios, it is shown that SU(3)symmetry breaking in hyperon semileptonic decays is of $5-11%$ and confirms thevalidity of the Cabibbo model for hyperon semi-leptonic decays.

Test of SU(3) Symmetry in Hyperon Semileptonic Decays