Warped Higgsless Models with IR--Brane Kinetic Terms

H. Davoudiasl; J. L. Hewett; B. Lillie; T. G. Rizzo

doi:10.1088/1126-6708/2004/05/015

paper

Warped Higgsless Models with IR--Brane Kinetic Terms

arXiv:hep-ph/0403300 · doi:10.1088/1126-6708/2004/05/015

Abstract

We examine a warped Higgsless $S U (2)_{L} \times S U (2)_{R} \times U (1)_{B - L}$ 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 ( $\sim 2 - 3$ 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 precision electroweak data. In contrast, the inclusion of a kinetic term corresponding to the $S U (2)_{D}$ custodial symmetry of the theory delays the unitarity violation in $W_{L}^{\pm}$ scattering to energy scales of $\sim 6 - 7$ 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.

23 pages, 8 figures