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.

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