Topcolor breaking through boundary conditions

Abstract

The nontrivial boundary conditions (BC's) for the Topcolor breaking are investigated in the context of the TeV-scale extra dimension scenario. In the gauge symmetry breaking mechanism via the BC's we do not need to incorporate a dynamical mechanism for the Topcolor breaking into the model. Moreover, the Topcolor breaking can be realized without introducing explicitly a (composite) scalar field. We present a six dimensional model where the top and bottom quarks in the bulk have the Topcolor charge while the other quarks in the bulk do not. We also put the electroweak gauge interaction in the six dimensional bulk. The bottom quark condensation is naturally suppressed owing to the power-like running of the bulk U(1)_Y interaction, so that only the top condensation is expected to take place. We explore such a possibility based on the ladder Schwinger-Dyson equation and show the cutoff to make the model viable.

12 pages, 2 figures. Version to be published in Physical Review D. Typos corrected

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• Radiative Effects on the Chiral Square
• Two universal extra dimensions and spinless photons at the ILC
• Anti-B --> X(s) gamma in two universal extra dimensions
• Dynamics behind the quark mass hierarchy
• Unitarity constraints on top quark signatures of Higgsless models
• Running of Neutrino Parameters and the Higgs Self-Coupling in a Six-Dimensional UED Model
• Higgs Production via Gluon Fusion in a Six Dimensional Universal Extra Dimension Model on S^2/Z_2
• Production of the top-pions from the higgsless--top-Higgs model at the LHC
• Top Mode Standard Model in Six Dimensions