Abstract
When comparing data on VBB coupling constants with SU(3) one usually assumes Sakurai's idea that the ϱ-meson couples universally to the isovector current. In order to use this assumption one has to continue the coupling from the vector meson pole to t=0. The implications for the coupling constants depend upon how this continuation is carried out. In this paper we present arguments to expect simple continuation properties for VNN form factors defined in analogy with the Sachs electromagnetic form factors, rather than for the vector and tensor form factors. We show that in this case experimental data are consistent with SU(3), Sakurai's universality idea and with Zweig's rule. Furthermore we find F D ratios close to the SU(6) prediction.
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