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 the effective potential approach. 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, the effects of the mass of the top partner and the mixing parameter on the modification $\Delta {\Gamma }_{HHH}$ are systematically analyzed. Numerical results indicate that $\Delta {\Gamma }_{HHH}$ deviates the one loop SM value substantially in the selected parameter space formed by the mass of the top partner and its mixing angle with the top partner.

Comments: 19 pages, 4 figures