# Holographic theories of electroweak symmetry breaking without aHiggs Boson

## Abstract

Recently, realistic theories of electroweak symmetry breaking have been constructed in which the electroweak symmetry is broken by boundary conditions imposed at a boundary of higher dimensional spacetime. These theories have equivalent 4D dual descriptions, in which the electroweak symmetry is dynamically broken by non-trivial infrared dynamics of some gauge interaction, whose gauge coupling {tilde g} and size N satisfy {tilde g}{sup 2}N {approx}> 16{pi}{sup 2}. Such theories allow one to calculate electroweak radiative corrections, including the oblique parameters S, T and U, as long as {tilde g}{sup 2}N/16{pi}{sup 2} and N are sufficiently larger than unity. We study how the duality between the 4D and 5D theories manifests itself in the computation of various physical quantities. In particular, we calculate the electroweak oblique parameters in a warped 5D theory where the electroweak symmetry is broken by boundary conditions at the infrared brane. We show that the value of S obtained in the minimal theory exceeds the experimental bound if the theory is in a weakly coupled regime. This requires either an extension of the minimal model or departure from weak coupling. A particularly interesting scenario is obtained if the gauge couplings in the 5D theory take the largest possiblemore »

- Authors:

- Publication Date:

- Research Org.:
- Ernest Orlando Lawrence Berkeley NationalLaboratory, Berkeley, CA (US)

- Sponsoring Org.:
- USDOE Director. Office of Science. Office of High Energy andNuclear Physics. Division of High Energy Physics

- OSTI Identifier:
- 860460

- Report Number(s):
- LBNL-54212

R&D Project: PTHOPS; BnR: KA1401020; TRN: US0504927

- DOE Contract Number:
- DE-AC02-05CH11231

- Resource Type:
- Journal Article

- Journal Name:
- Physical Review D

- Additional Journal Information:
- Journal Volume: 69; Related Information: Journal Publication Date: 2004

- Country of Publication:
- United States

- Language:
- English

- Subject:
- 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; BOSONS; BOUNDARY CONDITIONS; DUALITY; FERMIONS; HIGGS BOSONS; LEPTONS; QUARKS; RADIATIVE CORRECTIONS; SCALARS; SPACE-TIME; STANDARD MODEL; SYMMETRY; SYMMETRY BREAKING

### Citation Formats

```
Burdman, Gustavo, and Nomura, Yasunori.
```*Holographic theories of electroweak symmetry breaking without aHiggs Boson*. United States: N. p., 2003.
Web.

```
Burdman, Gustavo, & Nomura, Yasunori.
```*Holographic theories of electroweak symmetry breaking without aHiggs Boson*. United States.

```
Burdman, Gustavo, and Nomura, Yasunori. Tue .
"Holographic theories of electroweak symmetry breaking without aHiggs Boson". United States. https://www.osti.gov/servlets/purl/860460.
```

```
@article{osti_860460,
```

title = {Holographic theories of electroweak symmetry breaking without aHiggs Boson},

author = {Burdman, Gustavo and Nomura, Yasunori},

abstractNote = {Recently, realistic theories of electroweak symmetry breaking have been constructed in which the electroweak symmetry is broken by boundary conditions imposed at a boundary of higher dimensional spacetime. These theories have equivalent 4D dual descriptions, in which the electroweak symmetry is dynamically broken by non-trivial infrared dynamics of some gauge interaction, whose gauge coupling {tilde g} and size N satisfy {tilde g}{sup 2}N {approx}> 16{pi}{sup 2}. Such theories allow one to calculate electroweak radiative corrections, including the oblique parameters S, T and U, as long as {tilde g}{sup 2}N/16{pi}{sup 2} and N are sufficiently larger than unity. We study how the duality between the 4D and 5D theories manifests itself in the computation of various physical quantities. In particular, we calculate the electroweak oblique parameters in a warped 5D theory where the electroweak symmetry is broken by boundary conditions at the infrared brane. We show that the value of S obtained in the minimal theory exceeds the experimental bound if the theory is in a weakly coupled regime. This requires either an extension of the minimal model or departure from weak coupling. A particularly interesting scenario is obtained if the gauge couplings in the 5D theory take the largest possible values--the value suggested by naive dimensional analysis. We argue that such a theory can provide a potentially consistent picture for dynamical electroweak symmetry breaking: corrections to the electroweak observables are sufficiently small while realistic fermion masses are obtained without conflicting with bounds from flavor violation. The theory contains only the standard model quarks, leptons and gauge bosons below {approx_equal}2 TeV, except for a possible light scalar associated with the radius of the extra dimension. At {approx_equal}2 TeV increasingly broad string resonances appear. An analysis of top-quark phenomenology and flavor violation is also presented, which is applicable to both the weakly-coupled and strongly-coupled cases.},

doi = {},

journal = {Physical Review D},

number = ,

volume = 69,

place = {United States},

year = {2003},

month = {12}

}