Theory Group Seminar, 16 February 2021
Kenneth Lane, BU
Higgs alignment and the top quark
abstract
There is a surprising connection between the top quark and Higgs alignment
in Gildener-Weinberg multi-Higgs doublet models. Were it not for the top
quark and its large mass, the coupling of the \( 125\,{\rm GeV} \) Higgs boson \(H\)
to gauge bosons and fermions would be indistinguishable to those of the
Standard Model Higgs. The top quark's coupling to a single Higgs doublet
breaks this perfect alignment in higher orders of the Coleman-Weinberg loop
expansion of the effective potential. But the effect is still small,
\(\lesssim {\cal{O}}(1\%) \), and probably experimentally inaccessible.