Approximate Alignment in Two Higgs Doublet Model with Extra Yukawa Couplings

With discovery of the 125 GeV boson h 0, the existence of a second doublet is very plausible. We show that the “alignment” phenomenon, that h 0 is found to resemble closely the Standard Model Higgs boson, may correspond to Higgs quartic couplings that are in strength. If the exotic bosons of the second doublet possess extra top Yukawa couplings, which are the least constrained by data, such a two-Higgs-doublet model could drive electroweak baryogenesis, as well as further “protect” the apparent alignment. The exotic Higgs bosons can be sub-TeV in mass while remaining well hidden so far, with broad parameter space for search at the Large Hadron Collider.

Note:

Final version corresponding to acceptance by Euro. Phys. Lett

new physics
naturalness
Higgs model
Higgs particle: doublet: 2
Higgs particle: mass
Higgs particle: coupling
coupling: Higgs
coupling: Yukawa
vacuum state: Higgs
vacuum state: alignment

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