2018/06/07 by Kwang Sik Jeong, Tae Hyun Jung, Chang Sub Shin · 1 voice · 1 citation
Physics and Astronomy · #Axion #Baryogenesis #Baryon asymmetry #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Dark matter #Electroweak interaction #Higgs boson #Lepton #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Yukawa potential #hep-ph
paper · pdf · doi:10.1016/j.physletb.2019.01.036
5 pages + appendix, 5 figures; PLB published version; a more clear comparison with singlet scalar extension is provided and references are added
arxiv published 2018/06/07 · openalex publication_date 2019/01/25 · arxiv created 2019/02/07 · arxiv updated 2019/02/08 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
An axion can make the electroweak phase transition strongly first-order as required for electroweak baryogenesis even if it is weakly coupled to the Higgs sector. This is essentially because the axion periodicity naturally allows the structure of phase transition to be insensitive to the axion decay constant that determines the strength of axion interactions. Furthermore, the axion can serve as a CP phase relevant to electroweak baryogenesis if one introduces an effective axion coupling to the top quark Yukawa operator. Then, for f between about TeV and order 10~TeV, the observed baryon asymmetry can be explained while avoiding current experimental constraints. It will be possible to probe the axion window for baryogenesis in future lepton colliders and beam-dump experiments.