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Abstract
A recent analysis of the electromagnetic nucleon form factors has yielded reliable values of the vector coupling constants g 1( ωNN), g 1( øNN). These, together with g 1( ϱNN), turn out to be compatible with SU(3), if a pure F-type coupling and an almost ideal mixing angle are assumed. The fairly large ratio g 1(ø NN) g 1(ø NN) ≈ −0.4 is almost entirely due to the coupling of ss to the nucleon and therefore indicates a strong violation of Zweig's rule. One of the largest structures in the nucleon spectral function occurs at the mass of a particle ϱ′(1250) which is not yet well-established and of which nonet partners are not known.
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