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

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

2005-09-26

arxiv.org/abs/hep-ph/0509290v1

PoS HEP2005 (2005) 148

Physics

High Energy Physics

High Energy Physics - Phenomenology

5 pages, JHEP style, Talk given at the International Europhysics Conference On High Energy Physics, July 21st -27th 2005, Lisb

Scientific paper

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.

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