Novel Enhancement of Loop-Induced $H^{\pm }{W}^{\mp }{Z}^0$ Vertex

Abstract

We discuss the non-decoupling effects on the loop-induced $H^{\pm }{W}^{\mp }{Z}^0$ vertex in the general two Higgs-doublet model. The decay process $H^{\pm }\to W^{\pm }{Z}^0$ is analyzed at one-loop level and possible enhancement of the decay width is explored. We find that a novel enhancement can be realized by the Higgs non-decoupling effects with large mass difference between charged and CP-odd Higgs bosons. The branching ratio of the process can be a few % $\sim$ 10%. Therefore the decay mode may be detectable at LHC or future $e^{+}{e}^{-}$ linear colliders (LC's).

Comments: Sprocl-tex, 5 pages including 3 figures. (Talk given at PPPP'97 Workshop: APCTP, 31 Oct. - 2 Nov., 1997, Seoul, Korea)