Electroweak phase transition in 2HDM under Higgs, Z-pole, and W precision measurements

Abstract

In this work we revisit the existence of a strong first order electroweak phase transition (SFOEWPT) and recent mW precision measurement in the Type-I and Type-II 2HDMs. The mathcal{O} (100) GeV new scalars in 2HDMs are favored by SFOEWPT, which is necessary for electroweak baryogenesis, and observed mW shift as well. We find that under current constraints, both Type-I and Type-II 2HDM can explain the SFOEWPT, Z-pole, Higgs precision measurements and mW precision measurement of CDF-II at same time, and all these precision measurements are sensitive to heavy Higgs mass splitting in 2HDM. The allowed regions are ∆mA/C ∈ (−400, 400) GeV, tan β ∈ (1, 50), and ∆mA/C ∈ (−200, 300) GeV, tan β ∈ (1, 10) for Type-I and Type-II 2HDM respectively. Furthermore future lepton collider measurements on Higgs and Z boson properties can explore this scenario in more detail or even rule out it.