Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2005-02-03
Phys.Rev. D71 (2005) 106004
Physics
High Energy Physics
High Energy Physics - Phenomenology
25 pages with 10 figures, Final version accepted by PRD
Scientific paper
10.1103/PhysRevD.71.106004
Recently bulk Randall-Sundrum theories with the gauge group $SU(2)_L \times SU(2)_R \times U(1)_{B-L}$ have drawn a lot of interest as an alternative to electroweak symmetry breaking mechanism. These models are in better agreement with electroweak precision data since custodial isospin symmetry on the IR brane is protected by the extended bulk gauge symmetry. We comprehensively study, in the $S^1/\ZZ$ orbifold, the bulk gauge and fermion fields with the general boundary conditions as well as the bulk and localized mass terms. Master equations to determine the Kaluza-Klein (KK) mass spectra are derived without any approximation, which is an important basic step for various phenomenologies at high energy colliders. The correspondence between orbifold boundary conditions and localized mass terms is demonstrated not only in the gauge sector but also in the fermion sector. As the localized mass increases, the first KK fermion mass is shown to decrease while the first KK gauge boson mass to increase. The degree of gauge coupling universality violation is computed to be small in most parameter space, and its correlation with the mass difference between the top quark and light quark KK mode is also studied.
Chang Sanghyeon
Park Seong Chan
Song JeongHyeon
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