Karlsruhe 2011 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 13: Elektroschwache Physik (Theorie)

T 13.5: Vortrag

Montag, 28. März 2011, 17:45–18:00, 30.23: 6-1

Electroweak symmetry breaking with nonlocal Higgs-Boson actions — Martin Beneke, •Philipp Knechtges, and Alexander Mück — Institut für Theoretische Teilchenphysik und Kosmologie, RWTH Aachen, Germany

We investigate a nonlocal Higgs sector as it was recently suggested in the context of unparticle physics. The Higgs fields are coupled in a gauge invariant way to the gauge bosons via a Wilson line or by a generalization of minimal coupling. We analyze spontaneous symmetry breaking in the nonlocal model and consider its phenomenological consequences, e.g. for the ρ parameter and the W^±-mass which receive corrections already at the tree-level. Moreover, we study the tree-level unitarity in gauge-boson scattering involving the exchange of the nonlocal Higgs boson. As in the Standard Model, all terms in the amplitude growing with energy are shown to cancel. Tree-level unitarity is subsequently employed to constrain the parameter space of the model.