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

Higgs boson mass bounds in the presence of a very heavy fourth quark generation,10.1007/JHEP01(2011)143,Journal of High Energy Physics,P. Gerhold,K. J

Higgs boson mass bounds in the presence of a very heavy fourth quark generation  
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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 × 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.
Journal: Journal of High Energy Physics - J HIGH ENERGY PHYS , vol. 2011, no. 1, pp. 1-13, 2011
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