From Tree Unitarity to Top Quark Physics in 5D Higgsless Models

Abstract

In five dimensional models of Higgsless electroweak symmetry breaking, tree level unitarity in gauge boson scattering is restored by the exchange of gauge boson Kaluza-Klein modes instead of a Higgs boson. Unitarity of scattering amplitudes involving top quarks requires also the Kaluza-Klein modes of the third family quarks. It is shown that the relevant unitarity cancellations are consistent with gauge symmetry breaking by boundary conditions. These results are used to constrain the couplings of the top quark to Kaluza-Klein modes and the implications for collider phenomenology are discussed.

arXiv comment5 pages, JHEP style, Talk given at the International Europhysics Conference On High Energy Physics, July 21st -27th 2005, Lisboa, Portugal

References in corpus (8)

• Phenomenology of the Little Higgs Model
• Fermions on an Interval: Quark and Lepton Masses without a Higgs
• Curing the Ills of Higgsless Models: the S Parameter and Unitarity
• Collider Phenomenology of the Higgsless Models
• Higgsless fermion masses and unitarity
• Unitarity, BRST Symmetry and Ward Identities in Orbifold Gauge Theories
• Hadron Collider Signatures for New Interactions of Top and Bottom Quarks
• Unitarity constraints on top quark signatures of Higgsless models