Multiscale Technicolor and the Zbb-bar Vertex
Abstract
We estimate the correction to the Zbb-bar vertex arising from the exchanges of the sideways extended technicolor (ETC) boson and the flavor-diagonal ETC boson in the multiscale walking technicolor model. The obtained result is too large to explain the present data. However, if we introduce a new self- interaction for the top quark to induce the top quark condensate serving as the origin of the large top quark mass, the corrected Rb=Gammab/Gammah can be consistent with the recent LEP data. The corresponding correction to Rc=Gammac/Gammah is shown to be negligibly small.
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