%0 Journal Article
%T Constraining a fourth generation of quarks: non-perturbative Higgs boson mass bounds
%A John Bulava
%A Karl Jansen
%A Attila Nagy
%J Physics
%D 2013
%I arXiv
%R 10.1016/j.physletb.2013.04.041
%X We present a non-perturbative determination of the upper and lower Higgs boson mass bounds with a heavy fourth generation of quarks from numerical lattice computations in a chirally symmetric Higgs-Yukawa model. We find that the upper bound only moderately rises with the quark mass while the lower bound increases significantly, providing additional constraints on the existence of a straight-forward fourth quark generation. We examine the stability of the lower bound under the addition of a higher dimensional operator to the scalar field potential using perturbation theory, demonstrating that it is not significantly altered for small values of the coupling of this operator. For a Higgs boson mass of $\sim125\mathrm{GeV}$ we find that the maximum value of the fourth generation quark mass is $\sim300\mathrm{GeV}$, which is already in conflict with bounds from direct searches.
%U http://arxiv.org/abs/1301.3416v1