$H^{+}{W}^{-}Z$ contribution to the static quantities of the W boson in the context of Higgs-triplet theories

We calculate the one–loop contribution from the $H^{+}{W}^{-}Z$ coupling to the static electromagnetic properties of the W boson. Although this coupling is absent at the tree–level in all Higgs–doublet models, it can be induced at this order in models including Higgs–triplet representations. It is found that the $H^{+}{W}^{-}Z$ contribution can be as important as those arising from other couplings including Higgs bosons, such as the standard model coupling WWH or the two–Higgs–doublet model couplings $H^{+}{W}^{-}{\varphi }^0$ and $WW{\varphi }^0$, with ${\varphi }^0=h$, $H$ and $A$.