Bounds on the renormalized couplings in an SU(2)L ⊗ SU(2)R symmetric Yukawa model
نویسندگان
چکیده
The vacuum stability lower bound on the mass of the Higgs boson is numerically investigated in an SU(2)L ⊗ SU(2)R symmetric Yukawa model, which describes two heavy degenerate fermion doublets in the limit of vanishing gauge couplings. Good agreement with perturbation theory is found, although the couplings are strong. The upper bound on the fermion mass and renormalized Yukawa coupling is also determined in the part of bare parameter space where reflection positivity has been proven.
منابع مشابه
Mass Spectrum and Bounds on the Couplings in Yukawa Models With Mirror-Fermions
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 ...
متن کاملNumerical simulation of heavy fermions in an SU(2)L ⊗ SU(2)R symmetric Yukawa model
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 SU(2)L⊗ SU(2)R symmetric Yukawa model with mirror fermions. The behaviour of fermion and boson masses is investigated at infinite bare quartic coupling on 4 · 8, 6 · 12 and 8 ·16 lattices. A first estimate of the upper bound on the renormalize...
متن کاملNon-perturbative Investigation of the Fermion-higgs Sector of the Standard Model
We present results for the renormalized quartic self-coupling λR and the renormalized Yukawa coupling yR in a fermionHiggs model with two SU(2) doublets, indicating that with the standard lattice regulator these couplings cannot become
متن کاملKUNS-1370 HE(TH)95/20 hep-ph/9511395 Duality of a Supersymmetric Standard Model without R parity
Recently one of the authors proposed a dual theory of a Supersymmetric Standard Model (SSM), in which it is naturally understood that at least one quark (the top quark) should be heavy, i.e., almost the same order as the weak scale, and the supersymmetric Higgs mass parameter can naturally be expected to be small. Unfortunately, the model cannot possess Yukawa couplings of lepton sector. In thi...
متن کاملDuality of a Supersymmetric Standard Model without R parity
Recently one of the authors proposed a dual theory of a Supersymmetric Standard Model (SSM), in which it is naturally understood that at least one quark (the top quark) should be heavy, i.e., almost the same order as the weak scale, and the supersymmetric Higgs mass parameter μ can naturally be expected to be small. Unfortunately, the model cannot possess Yukawa couplings of lepton sector. In t...
متن کامل