Axion-Higgs Unification
Abstract
In theories with no fundamental scalars, one gauge group can become strong at a large scale Lambda and spontaneously break a global symmetry, producing the Higgs and the axion as composite pseudo-Nambu-Goldstone bosons. We show how KSVZ and DFSZ axion models can be naturally realised. The assumption Lambda around 10^{11} GeV is phenomenologically favoured because: a) The axion solves the QCD theta problem and provides the observed DM abundance; b) The observed Higgs mass is generated via RGE effects from a small Higgs quartic coupling at the compositeness scale, provided that the Higgs mass term is fine-tuned to be of electroweak size; c) Lepton, quark as well as neutrino masses can be obtained from four-fermion operators at the compositeness scale. d) The extra fermions can unify the gauge couplings.
Cite
@article{arxiv.1208.6013,
title = {Axion-Higgs Unification},
author = {Michele Redi and Alessandro Strumia},
journal= {arXiv preprint arXiv:1208.6013},
year = {2015}
}
Comments
19 pages. Refs. added and eq. 3.6 fixed