Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2000-12-20
Physics
High Energy Physics
High Energy Physics - Phenomenology
4 pages, LaTeX, talk presented at the Linear Collider Workshop 2000, Fermilab, Oct. 24-28, 2000
Scientific paper
10.1063/1.1394389
The electroweak symmetry may be broken by a composite Higgs which arises naturally as a bound state of the top quark if the standard model gauge fields and fermions propagate in extra dimenions. 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 $\sim 200$ GeV. The bounds on the compactification scale can be quite low if all standard model fields propagate in the same extra dimensions due to the momentum conservation in extra dimensions. The current lower limits are about 300 GeV for one extra dimension and 400-800 GeV for two extra dimensions. The future collider experiments may either discover the Kaluza-Klein (KK) states of the standard model fields or raise their mass limits significantly. There may also be some other light bound states which could be observed at upcoming collider experiments.
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