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arXiv · 2102.07242

Higgs alignment and the top quark

Estia J. Eichten·Kenneth Lane
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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 GeV Higgs boson $H$ to gauge bosons and fermions would be indistinguishable from 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, $< {\cal{O}}(1\%)$, and probably experimentally inaccessible.

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Estia J. Eichten, Kenneth Lane. 2021-02-14. Higgs alignment and the top quark. https://doi.org/10.1103/physrevd.103.115022

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