Abstract
We discuss how the parity-violating (PV) photon-nucleon ($\ensuremath{\gamma}\mathrm{NN}$) coupling (or, more generally, any PV $\ensuremath{\gamma}B{B}^{\ensuremath{'}}$ vertex) can be calculated consistently in the vector-meson-dominance model. Gauge invariance gives rise to useful constraints among the weak $\mathrm{VNN}$ coupling constants ($V=\ensuremath{\rho},\ensuremath{\omega},\ensuremath{\varphi}$). Our estimates indicate that effects caused by the PV $\ensuremath{\gamma}\mathrm{NN}$ vertex could be as important as those caused by radiative corrections due to two-boson exchange.
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