Higgs boson mass bounds in the presence of a very heavy fourth quark generation

Abstract

We study the effect of a potential fourth quark generation on the upper and lower Higgs boson mass bounds. This investigation is based on the numerical evaluation of a chirally invariant lattice Higgs-Yukawa model emulating the same Higgs-fermion coupling structure as in the Higgs sector of the electroweak Standard Model. In particular, the considered model obeys a Ginsparg-Wilson version of the underlying $SU(2{)}_L\times U(1{)}_Y$ symmetry, being a global symmetry here due to the neglection of gauge fields in this model. We present our results on the modification of the upper and lower Higgs boson mass bounds induced by the presence of a hypothetical very heavy fourth quark doublet. Finally, we compare these findings to the standard scenario of three fermion generations.

9 pages, 3 figures

References in corpus (4)

• The phase structure of a chirally invariant lattice Higgs-Yukawa model - numerical simulations
• Lower Higgs boson mass bounds from a chirally invariant lattice Higgs-Yukawa model with overlap fermions
• Chiral Lattice Gauge Theories and The Strong Coupling Dynamics of a Yukawa-Higgs Model with Ginsparg-Wilson Fermions
• Lattice chirality and the decoupling of mirror fermions

Cited by in corpus (6)

• Higgs Mass Bounds from Renormalization Flow for a Higgs-top-bottom model
• Status of the fourth fermion generation before ICHEP2012: Higgs data and electroweak precision observables
• Overlap valence quarks on a twisted mass sea: a case study for mixed action Lattice QCD
• Higgs-Yukawa model in chirally-invariant lattice field theory
• A lattice study of a chirally invariant Higgs-Yukawa model including a higher dimensional ${\Phi }^6$-term
• Rescuing 331 bileptons from the Landau pole