Higgs alignment and the top quark
This event is part of the HEE Seminar Series.
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 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, O((1%). Common experimental searches for 2HDM (H', A, H+-) bosons are discussed, including those for which no signal is accessible and those which are promising -- but challenging. https://bostonu.zoom.us/j/94721591906?pwd=MFlIVDZjSkpNQlN4c0lIbnd5MFF2Zz09