NUMERICAL-SIMULATION OF HEAVY FERMIONS IN AN SU(2)(L)CIRCLE-TIMES-SU(2)(R) SYMMETRICAL YUKAWA MODEL

An exploratory numerical study of the influence of heavy fermion doubl ets on the mass of the Higgs boson is performed in the decoupling limi t of a chiral SU(2)L x SU(2)R symmetric Yukawa model with mirror fermi ons. The behaviour of fermion and boson masses is investigated at infi nite bare quartic coupling on 4(3).8, 6(3).12 and 8(3).16 lattices. A first estimate of the upper bound on the renormalized quartic coupling as a function of the renormalized Yukawa coupling is given. On the al gorithmic side, several standard fermion matrix inversion methods were tried and tuned for better performance.