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Singlet-Assisted Electroweak Baryogenesis in Effective Field Theory and SO(6)/SO(5) Composite Higgs Models


Tada,  Aika Marie
Florian Goertz - Max Planck Research Group, Junior Research Groups, MPI for Nuclear Physics, Max Planck Society;

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Tada, A. M. (2022). Singlet-Assisted Electroweak Baryogenesis in Effective Field Theory and SO(6)/SO(5) Composite Higgs Models. Master Thesis, Ruprecht-Karls-Universität, Heidelberg.

Cite as: https://hdl.handle.net/21.11116/0000-000A-C213-5
It is known that the Baryon-Asymmetry in the Universe (BAU) can be generated
in Electroweak Baryogenesis when minimally extending the Standard Model (SM)
with a scalar singlet. A particularly well-researched class of models features a Z2
symmetry of the singlet that is spontaneously broken around the electroweak scale.
However, such a scenario generically leads to phenomenologically problematic
domain walls. Here, a thermal history in which the Z2 symmetry is not restored at
high temperatures is envisioned, as accomplished by introducing D ≤ 6 operators
in a general effective field theory (EFT). Introducing non-renormalizable operators
is the logical consequence of understanding the theory as the low-energy tail
of a more complete theory, such as in Composite Higgs (CH) scenarios, which
can additionally address the hierarchy problem and the flavor hierarchy puzzle.
Here I present a comprehensive analysis of the Yukawa terms and the scalar
potential generated up to D = 6 terms in various SO(6)/SO(5) CH models. To
this end, a Spurion Analysis with SM fermions embedded in the (1), 6, 15 or 20′
representations of SO(6) is performed. The most promising model is successfully
matched to the general EFT, showing that it can generate the correct BAU.