Electroweak Phase Transitions with BSM Fermions
High Energy Physics - Phenomenology
2022-01-26 v1
Abstract
We study the impact of additional beyond-the-Standard Model (BSM) fermions, charged under the Standard Model (SM) gauge group, on the electroweak phase transition (EWPT) in a 2-Higgs-Doublet-Model (2HDM) of type II. We find that the strength of the EWPT can be enhanced by about 40% compared to the default 2HDM. Therefore, additional light fermions are a useful tool to weaken the tension between increasing mass constraints on BSM scalars and the requirement of additional light scalar degrees of freedom to accommodate a strong first order EWPT. The findings are of particular interest for a variety of (non-minimal) split supersymmetry scenarios which necessarily introduce additional light fermion degrees of freedom.
Cite
@article{arxiv.2107.09617,
title = {Electroweak Phase Transitions with BSM Fermions},
author = {Martin Gabelmann and M. Margarete Mühlleitner and Jonas Müller},
journal= {arXiv preprint arXiv:2107.09617},
year = {2022}
}