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

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

1994-03-21

arxiv.org/abs/hep-ph/9403318v1

Phys.Lett. B331 (1994) 378-382

Physics

High Energy Physics

High Energy Physics - Phenomenology

9 pages + 3 appended ps figures, SWAT/27

Scientific paper

10.1016/0370-2693(94)91067-7

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 $10\%$.

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