Speaker
Description
If, as so many believe, there are "BSM" Higgs bosons, it poses three questions:
- Why is the 125 GeV Higgs, H, so light?
- Why does H have only the Standard Model (SM) couplings to gauge bosons and fermions?
- What are the BSM Higgs masses?
Their answers are in a forgotten treasure by Eldad Gildener and Steven Weinberg (GW), Phys Rev D33, 3333 (1976)). GW assume a scale-invariant electroweak theory with multiple Higgses. The scale symmetry is spontaneously broken and H is its massless dilaton. In the one-loop approximation, scale symmetry is explicitly broken at a scale identified with the electroweak decay constant $v = 246\,{\rm GeV}$. Then, H acquires the low mass $M_H = 125$ GeV, and a sum rule relates its mass to those of the BSM Higgses. Thus, the mass scale of the BSM Higgses is set by $v$ or, equivalently, $M_H$, and the BSM Higgses are all relatively light, of order 500 GeV in a two-Higgs doublet model of the GW scheme.
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