One loop corrections to the trilinear self coupling of the Higgs boson in the standard model with inclusion of singlet vector-like top quark

Abstract

The complete one loop corrections to the trilinear self coupling of the Higgs boson is firstly evaluated in the Standard Model (SM) by employing the zero momentum approximation. Numerical results of the trilinear self coupling and its modifier $κ_λ$ are obtained. Then we extend the SM by including a singlet vector-like top partner and assume that the top partner only mixes with the top quark, combining with the latest value of the Higgs boson trilinear self coupling modifier $κ_λ$ reported by ATLAS Collaboration, the effects of the mass of the top partner and the mixing parameter on the modifier $κ_λ$ are systematically analyzed. Results indicate that the upper bound of the singlet top partner is about $2800$\,GeV.