Status of electroweak baryogenesis in minimal composite Higgs

We present an update on the status of electroweak baryogenesis in minimal composite Higgs models. The particularity of this framework is that the electroweak phase transition can proceed simultaneously with the confinement phase transition of the new strong dynamics that produces the composite Higgs...

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Hauptverfasser: Bruggisser, Sebastian (VerfasserIn) , von Harling, Benedict (VerfasserIn) , Matsedonskyi, Oleksii (VerfasserIn) , Servant, Géraldine (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: 2023
In: Journal of high energy physics
Year: 2023, Heft: 8, Pages: 1-42
ISSN:1029-8479
DOI:10.1007/JHEP08(2023)012
Online-Zugang:Verlag, kostenfrei, Volltext: https://doi.org/10.1007/JHEP08(2023)012
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Verfasserangaben:Sebastian Bruggisser, Benedict von Harling, Oleksii Matsedonskyi and Géraldine Servant

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520 |a We present an update on the status of electroweak baryogenesis in minimal composite Higgs models. The particularity of this framework is that the electroweak phase transition can proceed simultaneously with the confinement phase transition of the new strong dynamics that produces the composite Higgs. The latter transition is controlled by the dilaton — the pseudo-Goldstone boson of an approximate scale invariance of the composite sector. Since it naturally is first-order, the electroweak phase transition becomes first-order too. Another appealing aspect is that the necessary additional source of CP violation can arise from the variation of the quark Yukawa couplings during the phase transition, which is built-in naturally in this scenario. These two features address the shortcomings of electroweak baryogenesis in the Standard Model. We confront this scenario with the latest experimental bounds derived from collider searches for new resonances and measurements of the Higgs couplings and electric dipole moments. All these constraints provide (or will be able to provide in the near future) important bounds on the considered scenario, with the most stringent ones coming from LHC searches for new resonances which constrain the dilaton mass and couplings. We identify the viable region of parameter space which satisfies all the constraints, and is characterized by a dilaton mass in the 300-500 GeV range and a Higgs decay constant f ≲ 1.1 TeV. We discuss its future tests. 
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