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THE EFFECTS ON S, T AND U FROM HIGHER-DIMENSIONAL FERMION REPRESENTATIONS

Inspired by a new class of walking technicolor models recently proposed using higher-dimensional technifermions, we consider the oblique corrections from heavy nondegenerate 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 nondegeneracy of a heavy fermion multiplet.