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The flavor SU(3)_f group symmetry of QCD is systematically considered as theheavy c quark limit of SU(4)_f. Within that scheme we argue that the U(1)_Aanomaly prevents Gell-Mann's choice for the realization of the su(4)_f (andthereby the su(3)_f) algebra for the particular case of the neutral axialcurrents. Rather, Weyl's choice for the SU(4)_f generators has to be used whichleads to a neutral strong axial current having same structure (up to a constantfactor) as the weak one.Comment: 5 pages RevTex; replaced by the version accepted for publication in  Phys. Rev.

Strange isosinglet versus octet scalar axial vector current