Higgs potential bounds on extra quark-lepton generations

Abstract

We consider the bounds for the values of higgs mass $M_H$ and of the mass of the extra quarks and leptons $M_{extra}$ derived from the stability of vacuum and from the absence of Landau pole in Higgs potential. We find that in the case of the absence of new physics up to the GUT scale the bounds for the mass of the 4th generation are so restrictive that the negative result of CDF search for extra quarks closes the window for fourth generation. In the case of the absence of new physics up to $10^5$ GeV we get weaker but still nontrivial bounds on $M_H$ and $M_{extra}$ as well.

7pp, LaTeX, uses epsf, 5 figures, PS file available at http://venus.itep.ru/preprints/1995/95058.ps.gz

References in corpus (4)

• Observation of Top Quark Production in Pbar-P Collisions
• Observation of the Top Quark
• Improved Higgs Mass Stability Bound in the Standard Model and Implications for Supersymmetry
• Precise Vacuum Stability Bound in the Standard Model

Cited by in corpus (8)

• Quarks and Leptons Beyond the Third Generation
• Constraints on Mass Spectrum of Fourth Generation Fermions and Higgs Bosons
• Effective operators and vacuum instability as heralds of new physics
• The Fundamental-Weak Scale Hierarchy in the Standard Model
• Four Generations: SUSY and SUSY Breaking
• Bounds on the lightest Higgs boson mass with three and four fermion generations
• Higgs Boson Bounds in Three and Four Generation Scenarios
• Could there be a Fourth Generation?