Upper Higgs boson mass bounds from a chirally invariant lattice Higgs-Yukawa model

Abstract

We establish the cutoff-dependent upper Higgs boson mass bound by means of direct lattice computations in the framework of a chirally invariant lattice Higgs-Yukawa model emulating the same chiral Yukawa coupling structure as in the Higgs-fermion sector of the Standard Model. As expected from the triviality picture of the Higgs sector, we observe the upper mass bound to decrease with rising cutoff parameter Λ. Moreover, the strength of the fermionic contribution to the upper mass bound is explored by comparing to the corresponding analysis in the pure Φ4-theory. Our final results on the cutoff-dependent upper Higgs boson mass bound are summarized in figure 1.