Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1999-12-14
Nucl.Phys. B589 (2000) 249-268
Physics
High Energy Physics
High Energy Physics - Phenomenology
25 pages. More clarifications in section 2 on the equivalence between the orbifold projection and the boundary conditions. Ver
Scientific paper
10.1016/S0550-3213(00)00401-6
Electroweak symmetry can be naturally broken by observed quark and gauge fields in various extra-dimensional configurations. No new {\it fundamental} fields are required below the quantum gravitational scale ($\sim$ 10 - 100 TeV). We examine schemes in which the QCD gauge group alone, in compact extra dimensions, forms a composite Higgs doublet out of (t,b)_L and a linear combination of the Kaluza-Klein modes of t_R. The effective theory at low energies is the Standard Model. The top-quark mass is controlled by the number of active t_R Kaluza-Klein modes below the string scale, and is in agreement with experiment.
Cheng Hsin-Chia
Dobrescu Bogdan A.
Hill Christopher T.
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