Effects of a potential fourth fermion generation on the upper and lower Higgs boson mass bounds

Details Effects of a potential fourth fermion generation on the upper and lower Higgs boson mass bounds Effects of a potential fourth fermion generation on the upper and lower Higgs boson mass bounds

2010-10-28

arxiv.org/abs/1010.6005v1

PoS Lattice2010:051,2010; PoS ICHEP2010:367,2010

Physics

High Energy Physics

High Energy Physics - Lattice

presented at 35th International Conference of High Energy Physics

Scientific paper

We study the effect of a potential fourth fermion 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.

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