Do Heavy Fermions Decouple?

L. Lin

Chinese Journal of Physics

32卷6S期（1994 / 12 / 01）

1203 - 1212

英文

According to one-loop perturbation theory, fermions whose masses are totally generated from Yukawa couplings do not decouple in the heavy mass limit. We investigate this issue nonperturbatively in the strong coupling regime of the chiral U(1) mirrorfermion model in four dimensions. Our numerical results indicate nondecoupling of heavy fermion and mirror-fermion, thus supporting the one-loop picture. We also study this issue in a simpler, but vector-like Z(2) scalar-fermion model. Preliminary results at intermediate Yukawa coupling suggest the nondecoupling of fermions as well.