Model-independent Constraints on Topcolor from $R_b$

Details Model-independent Constraints on Topcolor from $R_b$ Model-independent Constraints on Topcolor from $R_b$

1997-02-05

arxiv.org/abs/hep-ph/9702265v2

Phys.Lett. B403 (1997) 101-107

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages; uses LaTeX and psfig. Version to be published in Physics Letters B. Expanded discussion on top-pion and b-pion contr

Scientific paper

10.1016/S0370-2693(97)00484-X

We identify and compute the main corrections to $R_b$ in Topcolor theories. They are due to the top-pions, the pseudo-Goldstone bosons associated with the chiral symmetry breaking responsible for the top quark mass, and amount to -(1-4)%, independent of the details of the Topcolor model. We show that the cancellation of this effect against the contributions from Topcolor vector and scalar resonances is unlikely, given the inherently distinct character of the two scales governing the potentially cancelling terms. The resulting value of $R_b$ leads to severe constraints on Topcolor theories.

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