Jul 6 – 13, 2022
Bologna, Italy
Europe/Rome timezone

Higgs alignment and the top quark

Jul 8, 2022, 6:30 PM
Room 5 (Avorio)

Room 5 (Avorio)

Parallel Talk Higgs Physics Higgs Physics


Kenneth Lane


In Gildener-Weinberg multi-Higgs models of electroweak symmetry breaking,
the new, Beyond-Standard-Model Higgs bosons are surprisingly light,
$< 600$--$700\,{\rm GeV}$, well within reach of the LHC. There is a
surprising connection between the top quark and Higgs alignment in these
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 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, $< \cal{O}(\rm{1\%})$, and probably
experimentally inaccessible. The experimental consequence of this is that
many popular LHC searches for Beyond-Standard-Model Higgs bosons are
fruitless --- and they will remain so.

In-person participation Yes

Primary authors

Dr Estia Eichten (Fermi National Accelerator Laboratory) Kenneth Lane

Presentation materials