Strong Extended Technicolour Interactions and the $Zb\bar{b}$ Vertex

Abstract

LEP precision measurements of the $Zb\bar{b}$ vertex coupling are sufficiently accurate to see the non-oblique corrections from the heavy gauge boson responsible for the large top mass in standard extended tecnicolour models. If the ETC couplings are strong the techni-fermion condensate may be enhanced by several orders of magnitude allowing a top mass of order 150GeV to be obtained for large values of the ETC breaking scale sufficient to supress the ETC contribution to the $Zb\bar{b}$ vertex. In this letter we investigate the degree of fine tuning of the ETC coupling required in a realistic model. We conclude that the fine tuning need only be of order $10\%$.

9 pages + 3 appended ps figures, SWAT/27

References in corpus (3)

• Non-Oblique Effects in the Z b b_bar Vertex from ETC Dynamics
• Walking Technicolor And The $Zb\bar{b}$ Vertex
• Non-oblique Correction in Extenden Technicolor Theory

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