Unscrambling New Models for Higher-Energy Physics

There is strong evidence that new physical degrees of freedom and new phenomena exist and may be revealed in future collider experiments. The best hints of what this new physics might be are provided by electroweak symmetry breaking. I briefly review certain theories for physics beyond the standard model, including the top-quark seesaw model and universal extra dimensions. A common feature of these models is the presence of vector-like quarks at the TeV scale. Then I discuss the role of a linear $e^+e^-$ collider in disentangling this new physics.Comment: 10 pages, LaTeX, uses aipproc.cls and aipproc.sty. Plenary talk given at the 5th International Linear Collider Workshop, Fermilab, Oct. 24-28, 200

Testing Technicolor with Scalars at the First Muon Collider

An interesting class of models of dynamical electroweak symmetry breaking allows only the third generation fermions to acquire dynamical masses, such that the masses of the first two generations should be given by coupling to a nonstandard ``Higgs'' doublet. The scalars in this case have large couplings to the second generation, so that they are copiously produced at a muon collider. We analyze the potential for discovery of the neutral scalars in the $s$-channel, and we show that at resonance there will be observed in excess of $10^5$ events per year.Comment: 8 pages, latex, aipproc.st