Electroweak Phase Transition and Baryogenesis in Composite Higgs Models

by Dr Benedict Von Harling (IFAE)


In this talk, I present a 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. The
confinement phase transition is described 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 it is found that the electroweak phase transition in this
scenario can naturally be first-order, allowing for electroweak
baryogenesis. I then discuss how a sufficient amount of CP violation –
another key ingredient of baryogenesis – can be generated from quark
Yukawa couplings which vary during the phase transition. Together this
allows for successful electroweak baryogenesis. This scenario can be
tested in complementary ways: in EDM experiments, by searching for
dilaton production and deviations in Higgs couplings at colliders, and
through gravitational waves at LISA.

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