# Higgs boson mass bounds in the presence of a very heavy fourth quark generation - High Energy Physics - Lattice

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Abstract: We study the effect of a potential fourth quark generation on the upper andlower Higgs boson mass bounds. This investigation is based on the numericalevaluation of a chirally invariant lattice Higgs-Yukawa model emulating thesame Higgs-fermion coupling structure as in the Higgs sector of the electroweakStandard Model. In particular, the considered model obeys a Ginsparg-Wilsonversion of the underlying ${SU}2 L\times {U}1 Y$ symmetry, being a globalsymmetry here due to the neglection of gauge fields in this model. We presentour results on the modification of the upper and lower Higgs boson mass boundsinduced by the presence of a hypothetical very heavy fourth quark doublet.Finally, we compare these findings to the standard scenario of three fermiongenerations.

Autor: P. Gerhold, K. Jansen, J. Kallarackal

Fuente: https://arxiv.org/