Why the Higgs is light, why it has Standard Model couplings to gauge bosons and fermions, and where there are more Higgses to be found

Abstract

Current data from the LHC indicate that the 125 GeV Higgs boson, H, is either the single Higgs of the Standard Model or, to a good approximation, an “aligned Higgs”. We propose that H is the pseudo-Goldstone dilaton of Gildener and Weinberg. We point out for the first time that this naturally and, as far as we know, uniquely accounts for its low mass and its alignment. It further implies the existence of additional Higgs bosons in the vicinity of 200–500 GeV. We illustrate our proposal in a two-Higgs-doublet model of Lee and Pilaftsis and discuss the model’s observational consequences at the LHC.