In theories of dynamical electroweak symmetry breaking, the electroweak interactions are broken to electromagnetism by the vacuum expectation value of a fermion bilinear. These theories may thereby avoid the introduction of fundamental scalar particles, of which we have no examples in nature. In this note, we review the status of experimental searches for… (More)
Recent results from CDF indicate that the inclusive cross section for jets with E T > 200 GeV is significantly higher than that predicted by QCD. We describe here a simple flavor-universal variant of the " coloron " model of Hill and Parke that can accommodate such a jet excess, and which is not in contradiction with other experimental data. As such, the… (More)
Precision electroweak data are generally believed to constrain the Higgs boson mass to lie below approximately 190 GeV at 95% confidence level. The standard Higgs model is, however, trivial and can only be an effective field theory valid below some high energy scale characteristic of the underlying nontrivial physics. Corrections to the custodial isospin… (More)
We summarize the indirect eects of new physics in a variety of processes. We consider precision electroweak measurements, the g 2 of the muon, rare decays, meson mixing, CP violation, lepton number violating interactions, double beta decay, and the electric dipole moments of atoms, molecules, and the neutron. We include discussions of both model independent… (More)
Using precision electroweak data, we put limits on " natural " top-color assisted technicolor models. Generically the new U (1) gauge bosons in these models must have masses larger than roughly 2 TeV, although in certain (seemingly unrealistic) models the bound can be much lower.
Using precision electroweak data, we put limits on non-commuting extended technicolor models. We conclude that these models are viable only if the ETC-interactions are strong. Interestingly, these models predict a pattern of deviations from the standard model which can fit the data significantly better than the standard model does, even after taking into… (More)
Many types of physics beyond the standard model include an extended electroweak gauge group. If these extensions are associated with flavor symmetry breaking, the gauge interactions will not be flavor-universal. In this note we update the bounds placed by electroweak data on the existence of flavor non-universal extensions to the standard model in the… (More)
The triviality of the scalar sector of the standard one-doublet Higgs model implies that this model is only an effective low-energy theory valid below some cutoff scale Λ. The underlying high-energy theory must include flavor dynamics at a scale of order Λ or greater in order to give rise to the different Yukawa couplings of the Higgs to ordinary fermions.… (More)
We explore corrections to electroweak parameters in the context of Extended Techni-color (ETC) models in which the ETC gauge-boson which generates the top-quark mass carries weak SU (2) charge. For m t ∼ 150 GeV there exist potentially large corrections to the Z decay width to b-quarks. Interestingly, in contrast to the situation in ETC models where the… (More)
This talk reviews recent progress in Higgsless models of electroweak symmetry breaking , and summarizes relevant points of model-building and phenomenology.