Top quark loop corrections to the decay $H^+ \to h^0 W^+$ in the Two   Higgs Doublet Model
  We calculate the decay width for the process $H^+ \to h^0 W^+$ up to order $g^4$ in the framework of the Two Higgs Doublet Model. We argue that for some reasonable choice of the free parameters the contribution from the one-loop graphs can be as large as 40%. 
R. Santos, A. Barroso, L. Bruecher