SLAC - PUB - 10389 March 2004

We examine a warped Higgsless SU(2)L × SU(2)R × U(1)B−L model in 5–d with IR(TeV)–brane kinetic terms. It is shown that adding a brane term for the U(1)B−L gauge field does not affect the scale (∼ 2 − 3 TeV) where perturbative unitarity in W L W − L → W L W− L is violated. This term could, however, enhance the agreement of the model with the precision electroweak data. In contrast, the inclusion of a kinetic term corresponding to the SU(2)D custodial symmetry of the theory delays the unitarity violation in W± L scattering to energy scales of ∼ 6 − 7 TeV for a significant fraction of the parameter space. This is about a factor of 4 improvement compared to the corresponding scale of unitarity violation in the Standard Model without a Higgs. We also show that null searches for extra gauge bosons at the Tevatron and for contact interactions at LEP II place non-trivial bounds on the size of the IR-brane terms. ∗Work supported in part by the Department of Energy, Contract DE-AC03-76SF00515 †e-mails: [email protected], [email protected], [email protected], and [email protected] Work supported in part by the Department of Energy contract DE-AC03-76SF00515.