Electroweak phase transition and baryogenesis in composite Higgs models

Autor: Oleksii Matsedonskyi, Sebastian Bruggisser, Benedict von Harling, Geraldine Servant
Jazyk: angličtina
Rok vydání: 2018
Předmět:
Quark
Nuclear and High Energy Physics
Particle physics
Yukawa [coupling]
High Energy Physics::Lattice
FOS: Physical sciences
finite temperature
baryogenesis
01 natural sciences
violation [CP]
Higgs sector
scalar [potential]
High Energy Physics - Phenomenology (hep-ph)
effective field theory
0103 physical sciences
critical phenomena [electroweak interaction]
ddc:530
lcsh:Nuclear and particle physics. Atomic energy. Radioactivity
conformal [invariance]
parameter space
010306 general physics
numerical calculations
Physics
composite [Higgs model]
010308 nuclear & particles physics
new physics
Electroweak interaction
mixing [quark]
High Energy Physics::Phenomenology
Yukawa potential
gravitational radiation
Technicolor and Composite Models
potential [dilaton]
Cosmology of Theories beyond the SM
Baryogenesis
High Energy Physics - Phenomenology
Composite Higgs models
Higgs boson
confinement [critical phenomena]
lcsh:QC770-798
Dilaton
High Energy Physics::Experiment
Higgs [coupling]
Zdroj: Journal of High Energy Physics, Vol 2018, Iss 12, Pp 1-57 (2018)
Journal of high energy physics 1812(12), 099 (2018). doi:10.1007/JHEP12(2018)099
Journal of High Energy Physics
ISSN: 1029-8479
DOI: 10.3204/PUBDB-2018-03061
Popis: We present a comprehensive study of the electroweak phase transition in composite Higgs models, where the Higgs arises from a new, strongly-coupled sector which confines near the TeV scale. This work extends our study in Ref. [1]. We describe the confinement phase transition in terms of the dilaton, the pseudo-Nambu-Goldstone boson of broken conformal invariance of the composite Higgs sector. From the analysis of the joint Higgs-dilaton potential we conclude that in this scenario the electroweak phase transition can naturally be first-order, allowing for electroweak baryogenesis. We then extensively discuss possible options to generate a sufficient amount of CP violation - another key ingredient of baryogenesis - from quark Yukawa couplings which vary during the phase transition. For one such an option, with a varying charm quark Yukawa coupling, we perform a full numerical analysis of tunnelling in the Higgs-dilaton potential and determine regions of parameter space which allow for successful baryogenesis. This scenario singles out the light dilaton region while satisfying all experimental bounds. We discuss future tests. Our results bring new opportunities and strong motivations for electroweak baryogenesis.
61 pages, 29 figures, 2 tables; v2: Analysis updated to account for washout of the baryon asymmetry during reheating after the phase transition, JHEP version
Databáze: OpenAIRE
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