Precision Supersymmetry Measurements at the e^-e^- Collider

Measurements of supersymmetric particle couplings provide important verification of supersymmetry. If some of the superpartners are at the multi-TeV scale, they will escape direct detection at planned future colliders. However, such particles induce nondecoupling corrections in processes involving the accessible superparticles through violations of the supersymmetric equivalence between gauge boson and gaugino couplings. These violations are analogous to the oblique corrections in the electroweak sector of the standard model, and can be parametrized in terms of super-oblique parameters. The $e^- e^-$ collision mode of a future linear collider is shown to be an excellent environment for such high precision measurements of these SUSY parameters, which will provide an important probe of superparticles beyond reachable energies.Comment: 12 pages, 4 figures, LaTeX, Talk presented at the 2nd International Workshop on Electron-Electron Interactions at TeV Energies, September 22-24, 1997, University of California, Santa Cru

Supersymmetric Lepton Flavor Violation at the NLC

Supersymmetric theories generally have new flavor violation sources in the squark and slepton mass matrices. If significant lepton flavor violation exists, selectron and smuon should be nearly degenerate. This leads to the phenomenon of slepton oscillations, which is analogous to neutrino oscillations, if sleptons are produced at the Next Linear Collider. The direct slepton production at the Next Linear Collider provides a much more powerful probe of lepton flavor violation than the current bounds from rare processes, such as $\mu \to e\gamma$.Comment: 5 pages, LaTeX, 1 figure, Talk presented at the 1st Symposium on Flavor-Changing Neutral Currents, Feb.19-21, 1997, Santa Monica, Californi

Minimal electroweak symmetry breaking model in extra dimensions

We show that if the Standard Model gauge fields and fermions propagate in extra dimenions, a composite Higgs field with the correct quantum number can arise naturally as a bound state due to the strong gauge interactions in higher dimensions. The top quark mass and the Higgs mass can be predicted from the infrared fixed points of the renormalization group equations. The top quark mass is in good agreement with the experimental value, and the Higgs boson mass is predicted to be ~200 GeV. There may be some other light bound states which could be observed at upcoming collider experiments.Comment: 3 pages, talk given at DPF2000, Columbus, Ohio, Aug. 9-1

Duality after Supersymmetry Breaking

Starting with two supersymmetric dual theories, we imagine adding a chiral perturbation that breaks supersymmetry dynamically. At low energy we then get two theories with soft supersymmetry-breaking terms that are generated dynamically. With a canonical Kahler potential, some of the scalars of the "magnetic" theory typically have negative mass-squared, and the vector-like symmetry is broken. Since for large supersymmetry breaking the "electric" theory becomes ordinary QCD, the two theories are then incompatible. For small supersymmetry breaking, if duality still holds, the magnetic theory analysis implies specific patterns of chiral symmetry breaking in supersymmetric QCD with small soft masses.Comment: 6 pages, LaTex, uses moriond.sty (included). Talk presented by Y.S. at the XXXIIIrd Rencontres de Moriond, Electroweak Interactions and Unified Theories, Les Arcs, Savoie, France, March 14-21, 199