Axiogenesis with a heavy QCD axion

Co, Raymond T.; Gherghetta, Tony; Harigaya, Keisuke

doi:10.1007/jhep10(2022)121

Title: Axiogenesis with a heavy QCD axion

Journal Article · Wed Oct 19 00:00:00 EDT 2022 · Journal of High Energy Physics (Online)

DOI:https://doi.org/10.1007/jhep10(2022)121· OSTI ID:1905514

^[1]; Gherghetta, Tony ^[1]; Harigaya, Keisuke ^[2]

Univ. of Minnesota, Minneapolis, MN (United States)
European Organization for Nuclear Research (CERN), Geneva (Switzerland)

We demonstrate that the observed cosmological excess of matter over anti-matter may originate from a heavy QCD axion that solves the strong CP problem but has a mass much larger than that given by the Standard Model QCD strong dynamics. We investigate a rotation of the heavy QCD axion in field space, which is transferred into a baryon asymmetry through weak and strong sphaleron processes. This provides a strong cosmological motivation for heavy QCD axions, which are of high experimental interest. The viable parameter space has an axion mass m_a between 1 MeV and 10 GeV and a decay constant f_a < 1⁰⁵ GeV, which can be probed by accelerator-based direct axion searches and observations of the cosmic microwave background.

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Research Organization:: Univ. of Minnesota, Minneapolis, MN (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: SC0011842

OSTI ID:: 1905514

Journal Information:: Journal of High Energy Physics (Online), Vol. 2022, Issue 10; ISSN 1029-8479

Publisher:: Springer NatureCopyright Statement

Country of Publication:: United States

Language:: English

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