Numerical simulation of heavy fermions in an SU(2)_L x SU(2)_R symmetric Yukawa model

Abstract

An exploratory numerical study of the influence of heavy fermion doublets on the mass of the Higgs boson is performed in the decoupling limit of a chiral $\mathrm{SU}(2{)}_{\mathrm{L}}\otimes \mathrm{SU}(2{)}_{\mathrm{R}}$ symmetric Yukawa model with mirror fermions. The behaviour of fermion and boson masses is investigated at infinite bare quartic coupling on $4^3\cdot 8$, $6^3\cdot 12$ and $8^3\cdot 16$ lattices. A first estimate of the upper bound on the renormalized quartic coupling as a function of the renormalized Yukawa-coupling is given.

Comments: 15 pp + 11 Figures appended as Postscript files