Abstract
We study the impact of additional beyond-the-Standard Model (BSM) fermions, charged under the Standard Model (SM) SU(2)L ⊗ U(1)Y 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.
Highlights
JHEP01(2022)012 searches for colored scalars are pushing the soft-SUSY-breaking scale of top superpartners above the TeV-scale [10, 11]
We study the impact of additional beyond-the-Standard Model (BSM) fermions, charged under the Standard Model (SM) SU(2)L ⊗ U(1)Y gauge group, on the electroweak phase transition (EWPT) in a 2-Higgs-Doublet-Model (2HDM) of type II
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
Summary
We work in the softly-broken Z2 symmetric version of the 2HDM [32, 33]. It is useful to define a basis with two Higgs doublets Hu and Hd with different isospin, Hu = Φ2, Hd = −iσ2Φ∗1 ,. Such that Hu, Hd and tan β = Hu / Hd coincide with the corresponding tree-level quantities of the MSSM. We extend the default particle content of the real CP-conserving 2HDM by additional non-SM like fermions. The BSM fermion sector should resemble the additional non-SM fermion part of the MSSM. For g1u = g1d = g1MSSM and g2u = g2d = g2MSSM, eq (2.3) coincides with the corresponding part of the tree-level Lagrangian of the MSSM. The abbreviation ‘sym.’ indicates that the matrix is symmetric with the corresponding entries to be filled in
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