A Three Site Higgsless Model
Abstract
We analyze the spectrum and properties of a highly-deconstructed Higgsless model with only three sites. Such a model contains sufficient complexity to incorporate interesting physics issues related to fermion masses and electroweak observables, yet remains simple enough that it could be encoded in a Matrix Element Generator program for use with Monte Carlo simulations. The gauge sector of this model is equivalent to that of the BESS model; the new physics of interest here lies in the fermion sector. We analyze the form of the fermion Yukawa couplings required to produce the ideal fermion delocalization that causes tree-level precision electroweak corrections to vanish. We discuss the size of one-loop corrections to b \to s \gamma, the weak-isospin violating parameter \alpha T and the decay Z \to b \bar{b}. We find that the new fermiophobic vector states (the analogs of the gauge-boson KK modes in a continuum model) can be reasonably light, with a mass as low as 380 GeV, while the extra (approximately vectorial) quark and lepton states (the analogs of the fermion KK modes) must be heavier than 1.8 TeV.
Cite
@article{arxiv.hep-ph/0607124,
title = {A Three Site Higgsless Model},
author = {R. Sekhar Chivukula and Baradhwaj Coleppa and Stefano Di Chiara and Hong-Jian He and Masafumi Kurachi and Elizabeth H. Simmons and Masaharu Tanabashi},
journal= {arXiv preprint arXiv:hep-ph/0607124},
year = {2008}
}
Comments
30 pages, JHEP.cls, axodraw. References and acknowledgements added, minor textual clarifications added and typos fixed, relationship to BESS model emphasized. Typos corrected, version to appear in PRD