Higgs sector contributions to \Delta a_\mu and the constraints on two-Higgs-doublet-model with and without SUSY

Abstract

Interesting contributions to $\Delta a_{\mu }$ from a two-Higgs-doublet-model is coming from a two-loop Barr-Zee diagram for most part of the parameter space -- a fact that has been overlooked by some Higgs/SUSY experts. A definite positive contribution has requirements that go against precision EW data and other known constraints. For the case without SUSY, in particular, this is almost enough to kill the two-Higgs-doublet-model (II). We will discuss the interplay of all the constraints and their implications.

Comments: 1+4 pages of latex with ws-procs9x6.cls,5 figure postscripts included; talk at SUSY03