Electroweak phase transition in 2HDM under Higgs, Z-pole, and W precision measurements
H. Y. Song, Wei Su, Mengchao Zhang
Abstract
A bstract In this work we revisit the existence of a strong first order electroweak phase transition (SFOEWPT) and recent m W precision measurement in the Type-I and Type-II 2HDMs. The $$ \mathcal{O} $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>O</mml:mi> </mml:math> (100) GeV new scalars in 2HDMs are favored by SFOEWPT, which is necessary for electroweak baryogenesis, and observed m W 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 m W 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 ∆ m A/C ∈ (−400 , 400) GeV, tan β ∈ (1 , 50), and ∆ m A/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.