Dynamical Electroweak Symmetry Breaking from Extra Dimensions
Michio Hashimoto, Masaharu Tanabashi, Koichi Yamawaki
Abstract
We study the dynamical electroweak symmetry breaking (DEWSB) in the D (=6,8,...)-dimensional bulk with compactified extra dimensions. We identify the critical binding strength for triggering the DEWSB, based on the ladder Schwinger-Dyson equation. In the top mode standard model with extra dimensions, where the standard model gauge bosons and the third generation of quarks and leptons are put in the bulk, we analyze the most attractive channel (MAC) by using renormalization group equations (RGEs) of (dimensionless) bulk gauge couplings and determine the effective cutoff where the MAC coupling exceeds the critical value. We then find that the top-condensation can take place for D=8. Combining RGEs of top-Yukawa and Higgs-quartic couplings with compositeness conditions, we predict the top mass, mt=173-180 GeV, and the Higgs mass, mH=181-211 GeV, for D=8, where we took the universal compactification scale 1/R = 1-100 TeV.
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