Emergent Electroweak Symmetry Breaking with Composite W, Z Bosons

TL;DR

This paper proposes a model where electroweak symmetry breaking occurs without a Higgs boson, using warped extra dimensions and composite W,Z bosons emerging from a strongly-coupled gauge theory, consistent with experimental data.

Contribution

It introduces a novel Higgsless model with composite electroweak bosons in warped extra dimensions, aligning with precision tests and offering new unitarization mechanisms.

Findings

W,Z bosons are composite states from a strongly-coupled gauge theory.

The model fits electroweak precision parameters S and T.

Potential for discovery at the LHC with composite gauge 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 strongly-coupled 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,Z-bosons 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.