☆ 4.3 Article

An ultra-weak sector, the strong CP problem and the pseudo-Goldstone dilaton

NUCLEAR PHYSICS B (2015)

Journal

NUCLEAR PHYSICS B

Volume 891, Issue -, Pages 613-626

Publisher

ELSEVIER SCIENCE BV

DOI: 10.1016/j.nuclphysb.2014.12.022

Keywords

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Categories

Physics, Particles & Fields

Funding

Leverhulme Trust
Fermilab
U.S. Department of Energy [DE-ACO2-07CH11359]

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Abstract

In the context of a Coleman-Weinberg mechanism for the Higgs boson mass, we address the strong CP problem. We show that a DFSZ-like invisible axion model with a gauge-singlet complex scalar field S, whose couplings to the Standard Model are naturally ultra-weak, can solve the strong CP problem and simultaneously generate acceptable electroweak symmetry breaking. The ultra-weak couplings of the singlet S are associated with underlying approximate shift symmetries that act as custodial symmetries and maintain technical naturalness. The model also contains a very light pseudo-Goldstone dilaton that is consistent with cosmological Polonyi bounds, and the axion can be the dark matter of the universe. We further outline how a SUSY version of this model, which may be required in the context of Grand Unification, can avoid introducing a hierarchy problem. (C) 2015 The Authors. Published by Elsevier B.V.

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