Warped Higgsless Models with IR-Brane Kinetic Terms

We examine a warped Higgsless $SU(2)_L\times SU(2)_R\times U(1)_{B-L}$ modelin 5--$d$ with IR(TeV)--brane kinetic terms. It is shown that adding a braneterm for the $U(1)_{B-L}$ gauge field does not affect the scale ($\sim 2-3$TeV) where perturbative unitarity in $W_L^+ W_L^- \to W_L^+ W_L^-$ is violated.This term could, however, enhance the agreement of the model with the precisionelectroweak data. In contrast, the inclusion of a kinetic term corresponding tothe $SU(2)_D$ custodial symmetry of the theory delays the unitarity violationin $W_L^\pm$ scattering to energy scales of $\sim 6-7$ TeV for a significantfraction of the parameter space. This is about a factor of 4 improvementcompared to the corresponding scale of unitarity violation in the StandardModel without a Higgs. We also show that null searches for extra gauge bosonsat the Tevatron and for contact interactions at LEP II place non-trivial boundson the size of the IR-brane terms.Comment: 23 pages, 8 figure