The Effects on S, T, and U from Higher-Dimensional Fermion Representations

2006/10/09 by Hong-Hao Zhang, Yue Cao, Qing Wang · 1 citation
Physics and Astronomy · #hep-ph #hep-th

paper · pdf · doi:10.1142/s0217732307022736

published as Mod.Phys.Lett.A22:2533-2538,2007 · 4 pages

arxiv created 2006/10/09 · arxiv updated 2009/12/01

Abstract

Inspired by a new class of walking technicolor models recently proposed using higher-dimensional technifermions, we consider the oblique corrections from heavy non-degenerate fermions with two classes of higher-dimensional representations of the electroweak gauge group itself. One is chiral SM-like, and the other is vector-like. In both cases, we obtain explicit expressions for S, T, U in terms of the fermion masses. We find that to keep the T parameter ultraviolet-finite there must be a stringent constraint on the mass non-degeneracy of a heavy fermion multiplet.

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