Emergent electroweak symmetry breaking with composite W, Z bosons
Abstract
We present a model of electroweak symmetry breaking in a warped extra dimension where electroweak symmetry is broken at the UV (or Planck) scale. An underlying conformal symmetry is broken at the IR (or TeV) scale generating masses for the electroweak gauge bosons without invoking a Higgs mechanism. By the AdS/CFT correspondence the W, Z bosons are identified as composite states of a stronglycoupled gauge theory, suggesting that electroweak symmetry breaking is an emergent phenomenon at the IR scale. The model satisfies electroweak precision tests with reasonable fits to the S and T parameter. In particular the T parameter is sufficiently suppressed since the model naturally admits a custodial SU(2) symmetry. The composite nature of the W, Zbosons provide a novel possibility of unitarizing WW scattering via form factor suppression. Constraints from LEP and the Tevatron as well as discovery opportunities at the LHC are discussed for these composite electroweak gauge bosons.
 Publication:

Journal of High Energy Physics
 Pub Date:
 November 2009
 DOI:
 10.1088/11266708/2009/11/080
 arXiv:
 arXiv:0907.0906
 Bibcode:
 2009JHEP...11..080C
 Keywords:

 High Energy Physics  Phenomenology;
 High Energy Physics  Theory
 EPrint:
 39 pages, 4 figures