Abstract
Within technicolor theories, we explore the impact of four-fermion interactions on the fermion mass splittings via explicit breaking of the custodial SU(2) R symmetry. Assuming they do not lead tounacceptably large flavor-changing neutral currents, the question is whether the large b-t quark mass splitting can be accommodated given the limits on ϱ−1, where ϱ ≡ M w 2 M z cos 2 θ w . We argue that this is possible, although further increases in the experimental bound on m t may be difficult to accommodate in the present framework.
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