Axiflavon-Higgs Unification

TL;DR

This paper presents a unified model combining axiflavon and Higgs sectors to address flavor hierarchies, the strong CP problem, dark matter, and electroweak symmetry breaking, with implications for axion decay constants and phenomenology.

Contribution

It introduces a novel unified framework embedding axiflavon and Goldstone Higgs in a single multiplet, linking flavor, CP conservation, and electroweak symmetry breaking.

Findings

Axion decay constant constrained to 10^{11}-10^{12} GeV in minimal model.

Adding right-handed neutrinos allows for lower axion decay constants (~10 TeV).

Model consistent with flavor physics, astrophysics, and Higgs potential requirements.

Abstract

In this talk, a unified model of scalar particles that addresses the flavour hierarchies, solves the strong CP problem, delivers a dark matter candidate, and radiatively triggers electroweak symmetry breaking is discussed. The recently proposed axiflavon is embedded together with an (elementary) Goldstone Higgs-sector in a single multiplet (and thereby also a model of flavour and strong CP conservation for the latter is provided). Bounds on the axion decay constant follow from requiring a SM-like Higgs potential at low energies and are confronted with constraints from flavour physics and astrophysics. In the minimal implementation, the axion decay constant is restricted to $f_a \approx (10^{11}-10^{12})$ GeV, while adding right-handed neutrinos allows for a heavy-axion model at lower energies, down to $f_a \sim 10$ TeV.