  There is a variety of new physics scenarios which deduce extended Higgs
sectors in the low energy effective theory. The coupling of a singly-charged
Higgs boson ($H^\pm$) with weak gauge bosons, $H^\pm W^\mp Z^0$, directly
depends on the global symmetry structure of the model, so that its experimental
determination can be useful to test each scenario. We discuss predictions on
this coupling in several models, such as the model with additional real and
complex triplets, the Littlest Higgs model, the two Higgs doublet model and the
minimal supersymmetric standard model. In order to measure the $H^\pm W^\mp
Z^0$ coupling we consider single $H^\pm$ production via the $WZ$ fusion
mechanism at the CERN Large Hadron Collider. The production rate is
hierarchically different among these models, so that this process can be useful
to explore new physics scenarios.
