Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2004-09-22
Phys.Lett. B606 (2005) 157-163
Physics
High Energy Physics
High Energy Physics - Phenomenology
10 pages, JHEP format, comments and reference to related paper added
Scientific paper
10.1016/j.physletb.2004.11.055
Extra-dimensional Higgsless models with electroweak symmetry breaking through boundary conditions generically have difficulties with electroweak precision constraints, when the fermions are localized to the ``branes'' in the fifth dimension. In this paper we show that these constraints can be relaxed by allowing the light fermions to have a finite extent into the bulk of the fifth dimension. The $T$ and $U$ electroweak parameters can be naturally suppressed by a custodial symmetry, while the $S$ parameter can be made to vanish through a cancellation, if the leakage into the bulk of the light gauge fields and the light left-handed fermion fields are of the same size. This cancellation is possible while allowing realistic values for the first two generations of fermion masses, although special treatment is probably required for the top quark. We present this idea here in the context of a specific continuum theory-space model; however, it can be applied to any five-dimensional Higgsless model, either with a flat or a warped background.
Foadi Roshan
Gopalakrishna Shrihari
Schmidt Carl
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