Axionic Electroweak Baryogenesis

Abstract

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.

arXiv comment5 pages + appendix, 5 figures; PLB published version; a more clear comparison with singlet scalar extension is provided and references are added

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• Search for boosted diphoton resonances in the 10 to 70 GeV mass range using 138 fb${}^{-1}$ of 13 TeV $pp$ collisions with the ATLAS detector
• Freeze-in Axion-like Dark Matter
• Paper-boat relaxion
• Search for diphoton resonances in the 66 to 110 GeV mass range using $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
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• Principle of multi-critical-points in the ALP-Higgs model and the corresponding phase transition
• New Physics Searches at Kaon and Hyperon Factories