Mass Spectrum and Bounds on the Couplings in Yukawa Models With Mirror-Fermions
L. Lin, G. Münster, M. Plagge, I. Montvay, H. Wittig, C. Frick, T. Trappenberg
Abstract
The SU(2)L SU(2)R symmetric Yukawa model with mirror-fermions in the limit where the mirror-fermion is decoupled is studied both analytically and numerically. The bare scalar self-coupling λ is fixed at zero and infinity. The phase structure is explored and the relevant phase transition is found to be consistent with a second order one. The fermionic mass spectrum close to that transition is discussed and a first non-perturbative estimate of the influence of fermions on the upper and lower bounds on the renormalized scalar self-coupling is given. Numerical results are confronted with perturbative predictions.
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