From axion quality and naturalness problems to a high-quality $\mathbb{Z}_{N}$ QCD relaxion
High Energy Physics - Phenomenology
2023-06-13 v3 High Energy Physics - Theory
Abstract
We highlight general issues associated with quality and naturalness problems in theories of light QCD-axions, axion-like particles, and relaxions. We show the presence of Planck-suppressed operators generically lead to scalar coupling of axions with the Standard model. We present a new class of QCD relaxion models that can address both the QCD relaxion CP problem as well as its quality problem. This new class of models also leads to interesting experimental signatures, which can be searched for at the precision frontier.
Keywords
Cite
@article{arxiv.2210.05690,
title = {From axion quality and naturalness problems to a high-quality $\mathbb{Z}_{N}$ QCD relaxion},
author = {Abhishek Banerjee and Joshua Eby and Gilad Perez},
journal= {arXiv preprint arXiv:2210.05690},
year = {2023}
}
Comments
17 pages, 4 figures; v2: previously ignored effects related to higher harmonics included, available parameter space updated, discussion extended; v3: matches the PRD accepted version