Speaker
Prof.
George W.S. Hou
(National Taiwan University)
Description
Existence of a second Higgs doublet is highly likely, but we should let Nature
decide on its couplings, and not impose extra discrete symmetry. Besides new
flavor changing neutral Higgs couplings, a new top Yukawa coupling of the heavy
neutral Higgs bosons H^0 and A^0 (denoting 125 GeV boson as h, the SM-like Higgs),
is naturally of order 1 in strength. It also naturally carries a new CPV
phase. Together with order 1 Higgs boson couplings involving the exotic Higgs
bosons, there can be sufficient CPV as well as strong first order electroweak
phase transition for sufficient electroweak baryogenesis. The order 1 new top
Yukawa and Higgs couplings would balance each other naturally, such that apparent
alignment could result, without decoupling. The relatively strong couplings and
CPV phase in the new top Yukawa coupling lead to many testable phenomenological
consequences, such as electron edm, higgs to two photons, t -> ch, triple Higgs
coupling, and possibilities for h -> mu tau and tau -> mu gamma.
Primary author
Prof.
George W.S. Hou
(National Taiwan University)