Preprint

PUBDB-2022-08018

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Status of Electroweak Baryogenesis in Minimal Composite Higgs

Bruggisser, S.Extern* ; von Harling, B. (Corresponding author) ; Matsedonskyi, O.Extern* ; Servant, G.DESY*

2022

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Please use a persistent id in citations: doi:10.3204/PUBDB-2022-08018

Report No.: DESY-22-209; arXiv:2212.11953

Abstract: 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 $f \lesssim 1.1$ TeV. We discuss its future tests.

Keyword(s): dilaton: mass ; electroweak interaction: critical phenomena ; critical phenomena: confinement ; dipole: electric ; Higgs model: composite ; coupling: Higgs ; CP: violation ; coupling: Yukawa ; baryogenesis ; Goldstone particle ; quark ; scaling ; interpretation of experiments: CERN LHC Coll ; decay constant ; TeV

Note: 42 pages, 10 figures

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Contributing Institute(s):

1. Theorie-Gruppe (T)

Research Program(s):

1. 611 - Fundamental Particles and Forces (POF4-611) (POF4-611)

Experiment(s):

1. No specific instrument

Appears in the scientific report 2022

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Database coverage:
; Published

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Linked articles:

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Journal Article Bruggisser, S.Extern* ; von Harling, B. (Corresponding author) ; Matsedonskyi, O.Extern* ; Servant, G.DESY*
Status of electroweak baryogenesis in minimal composite Higgs
Journal of high energy physics 08(8), 012 (2023) [10.1007/JHEP08(2023)012]2023     Files  Fulltext by arXiv.org BibTeX | EndNote: XML, Text | RIS

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