Mean field phase diagram of an SU(2${)}_{\mathit{L}}$×SU(2${)}_{\mathit{R}}$ lattice Higgs-Yukawa model at finite λ

The phase diagram of an SU(2${)}_{\mathit{L}}$×SU(2${)}_{\mathit{R}}$ lattice Higgs-Yukawa model with finite λ is constructed using mean field theory. The phase diagram bears a superficial resemblance to that for λ=∞; however, as λ is decreased the paramagnetic region shrinks in size. For small λ the phase transitions remain second order, and no new first order transitions are seen. © 1996 The American Physical Society.