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DOE OSTI · 1905514

Axiogenesis with a heavy QCD axion

Co, Raymond T.·Gherghetta, Tony·Harigaya, Keisuke
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Abstract

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 < 1 05 GeV, which can be probed by accelerator-based direct axion searches and observations of the cosmic microwave background.

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72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDSAxions and ALPsBaryo-and LeptogenesisCosmology of Theories BSMEarly Universe Particle Physics

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Co, Raymond T., Gherghetta, Tony, Harigaya, Keisuke. 2022-10-19. Axiogenesis with a heavy QCD axion. https://doi.org/10.1007/jhep10(2022)121

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