Warped electroweak breaking without custodial symmetry

Joan A. Cabrer, Gero Von Gersdorff, Mariano Quirós

Research output: Contribution to journalArticleResearchpeer-review

57 Citations (Scopus)

Abstract

We propose an alternative to the introduction of an extra gauge (custodial) symmetry to suppress the contribution of KK modes to the T parameter in warped theories of electroweak breaking. The mechanism is based on a general class of warped 5D metrics and a Higgs propagating in the bulk. The metrics are nearly AdS in the UV region but depart from AdS in the IR region, towards where KK fluctuations are mainly localized, and have a singularity outside the slice between the UV and IR branes. This gravitational background is generated by a bulk stabilizing scalar field which triggers a natural solution to the hierarchy problem. Depending on the model parameters, gauge-boson KK modes can be consistent with present bounds on EWPT for mKK≳1 TeV at 95% CL. The model contains a light Higgs mode which unitarizes the four-dimensional theory. The reduction in the precision observables can be traced back to a large wave function renormalization for this mode. © 2011.
Original languageEnglish
Pages (from-to)208-214
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume697
Issue number3
DOIs
Publication statusPublished - 7 Mar 2011

Keywords

  • Electroweak breaking
  • Electroweak observables
  • Extra dimensions
  • Warped spaces

Fingerprint Dive into the research topics of 'Warped electroweak breaking without custodial symmetry'. Together they form a unique fingerprint.

Cite this