Dresden 2013 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 23: Quantenfeldtheorie 1
T 23.3: Vortrag
Dienstag, 5. März 2013, 17:25–17:40, WIL-C129
Higgs boson mass bounds in a Higgs-Yukawa model — •Attila Nagy1,2, John Bulava3, and Karl Jansen2 — 1Humboldt Universität zu Berlin — 2NIC, Desy Zeuthen — 3CERN, Theory Devision
We investigate a chirally invaraiant Higgs-Yukawa model using a lattice regularisation by means of Monte Carlo simulations. The model consists of a complex scalar doublet and a doublet of fermions. We use dynamical overlap fermions to maintain an exact chiral symmetry while still not being affected by doubler modes.
In this model calculate Higgs boson mass bounds in the presence of a hypothetical fourth heavy fermion generation. With the propable discovery of the Higgs boson of a mass around 125 GeV, we give strong constrains on the mass of a forth quark generation to be maximally around 300 GeV. Comparison of our findings to lattice perturbation theory show that the model is qualitatively described by perturbation theory up to rather large Yukawa couplings. Using perturbation theory we additionally address the influence on the lower bound of higher dimensional operators (like a φ6-term) in the scalar field potential.