CONSTRAINTS ON DYNAMIC SYMMETRY-BREAKING MECHANISMS FROM ELECTROWEAK DATA

Consistency of the Salam-Weinberg theory, including quantum corrections, with high precision data from LEP and elsewhere imposes non-trivial bounds on the parameters of this theory, in particular the top quark mass. We take stock of the available experimental information in the electroweak sector with the view of constraining possible additional interactions, such as present in dynamical symmetry breaking scenarios. Using the Peskin-Takeuchi isospin conserving, S, and -violating, T, parametrization of new physics contribution to vacuum polarization corrections,we show here that the full one family technicolor models are ruled out at the $95 \%$ C.L. from the LEP data and $m_W$-measurement alone. We stress the role of improved precision measurements of the $W$-boson mass and the decay width $\Gamma(Z \to b\bar{b})$ in the enhanced sensitivity gained on such interactions.