ACP Seminar (Astronomy - Cosmology - Particle Physics)

Speaker: Pyungwon Ko (KIAS)
Title: A Resolution of the Flavor Problem of Two Higgs Doublet Models with $\bm{U(1)_H}$ Higgs flavor Symmetry
Date (JST): Wed, Mar 07, 2012, 13:30 - 14:30
Place: Seminar Room A
Abstract: We implement the Natural Flavor Conservation criterion in the two Higgs doublet model (2HDM) to an extra $U(1)_H$ gauge symmetry for Higgs flavor, assuming two Higgs doublets carry different $U(1)_H$ charges. Then one can easily avoid the tree level FCNC from neutral Higgs mediations using local gauge symmetries, instead of softly broken ad hoc $Z_2$ symmetry, and the pseudoscalar boson could be eaten by extra $Z_H$ boson. Imposing the anomaly cancellation, we find a number of interesting models, some of them are leptophobic or leptophilic. We sketch qualitative phenomenology of these models.