An effective Lagrangian description of charged Higgs decays H+→W+γ, W+Z and W+h0

Charged Higgs decays are discussed within an effective Lagrangian extension of the two-Higgs doublet model, assuming new physics appearing in the Higgs sector of this model. Low-energy constraints are used to imposse bounds on certain dimension-six operators that describe the modified charged Higgs interactions. These bounds are used then to study the decays H+→W+γ, W+Z and W+h0, which can have branching ratios (BR) of order 10−5, 10−1 and O(1), respectively; these modes are thus sensitive probes of the symmetries of the Higgs sector that could be tested at future colliders.