Electroweak Phase Transitions with BSM Fermions

Abstract

We study the impact of additional beyond-the-Standard Model (BSM) fermions, charged under the Standard Model (SM) $SU(2{)}_L\otimes U(1{)}_Y$ 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.

References in corpus (7)

• HiggsSignals-2: Probing new physics with precision Higgs measurements in the LHC 13 TeV era
• The Baryogenesis Window in the MSSM
• Strong First Order Electroweak Phase Transition in the CP-Conserving 2HDM Revisited
• Higgs Mass and Unnatural Supersymmetry
• Split Dirac Supersymmetry: An Ultraviolet Completion of Higgsino Dark Matter
• MSSM Higgs Benchmark Scenarios for Run 2 and Beyond: the low $\tan \beta$ region
• Split NMSSM with electroweak baryogenesis

Cited by in corpus (1)

• The trap in the early Universe: impact on the interplay between gravitational waves and LHC physics in the 2HDM