Small instantons and the strong C P problem in composite Higgs models

We show that QCD instantons can generate large effects at small length scales in the ultraviolet in standard composite Higgs models that utilize partial compositeness. This has important implications for possible solutions of the strong C P problem in these models. First we show that in the simplest...

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Bibliographic Details
Published in:Physical review. D 2021-10, Vol.104 (7), p.1, Article 075011
Main Authors: Gupta, R. S., Khoze, V. V., Spannowsky, M.
Format: Article
Language:English
Subjects:
Instantons
Quantum chromodynamics
Quarks
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Summary:We show that QCD instantons can generate large effects at small length scales in the ultraviolet in standard composite Higgs models that utilize partial compositeness. This has important implications for possible solutions of the strong C P problem in these models. First we show that in the simplest known UV completions of composite Higgs models, if an axion is also present, it can have a mass much larger than the usual QCD axion. Even more remarkable is the case where there are no axions, but the strong C P problem can be solved by generating the up quark mass entirely from the contribution of instantons thus reviving the massless up-quark solution for these models. In both cases no additional field content is required apart from what is required to realize partial compositeness.
ISSN:2470-0010
2470-0029
DOI:10.1103/PhysRevD.104.075011