Inflation, electroweak phase transition, and Higgs searches at the LHC in the two-Higgs-doublet model

Abstract

Abstract Combining the Higgs searches at the LHC, we study the Higgs inflation in the type-I and type-II two-Higgs-doublet models with non-minimally couplings to gravity. After imposing relevant theoretical and experimental constraints, we find that the Higgs inflation imposes stringent constraints on the mass splitting between A, H±, and H, and they tend to be nearly degenerate in mass with increasing of their masses. The direct searches for Higgs at the LHC can exclude many points achieving Higgs inflation in the region of mH (mA) < 450 GeV in the type-I model, and impose a lower bound on tan β for the type-II model. The Higgs inflation disfavors the wrong sign Yukawa coupling region of type-II model. In the parameter space achieving the Higgs inflation, the type-I and type-II models can produce a first order electroweak phase transition, but vc/Tc is much smaller than 1.0.