APEC Seminar (Astronomy - Particle Physics - Experimental Physics - Cosmology)

Speaker: Wei-Chih Huang (T. U. Dortmund )
Title: Two Higgs Doublets under Non-Abelian SU(2)_H
Date (JST): Fri, Sep 25, 2015, 13:30 - 14:30
Place: Seminar Room A
Related File: 1529.pdf
Abstract: A novel model embedding the two Higgs doublets into a doublet of a non-abelian gauge group SU(2)_H is presented. The Standard Model SU(2)_L singlet fermions are paired up with new heavy fermions to form SU(2)_H doublets, while SU(2)_L doublet fermions are singlets under SU(2)_H. Some of distinctive features of this anomaly-free model are: (1) Electroweak symmetry breaking is induced from spontaneous symmetry breaking of SU(2)_H; (2) One of the Higgs doublet can be inert, with its lowest mass component being a dark matter candidate as protected by the SU(2)_H gauge symmetry instead of a discrete Z_2 symmetry in the usual case; (3) Unlike Left-Right symmetric models, the complex gauge fields (W_1^{⧵prime} ⧵mp i W_2^{⧵prime}) (along with other complex scalar fields) associated with the SU(2)_H do not carry electric charges, while the third component W^{⧵prime}_3 can mix with the hypercharge U(1)_Y gauge field and the third component of SU(2)_L. I will present preliminary results, concentrating on collider constraints, Higgs physics and bounds from the electroweak precision data.