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Title: Electroweak constraints on warped models with custodial symmetry

Authors:
; ; ; ; ; ; ;
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
919105
Report Number(s):
FERMILAB-PUB-07-496-T
arXiv eprint number hep-ph/0701055
DOE Contract Number:
AC02-07CH11359
Resource Type:
Journal Article
Resource Relation:
Journal Name: Phys.Rev.D76:035006,2007
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Phenomenology-HEP

Citation Formats

Carena, Marcela S., /Fermilab, Ponton, Eduardo, /Columbia U., Santiago, Jose, /Fermilab, Wagner, C.E.M., and /Argonne /Chicago U., EFI /KICP, Chicago. Electroweak constraints on warped models with custodial symmetry. United States: N. p., 2007. Web. doi:10.1103/PhysRevD.76.035006.
Carena, Marcela S., /Fermilab, Ponton, Eduardo, /Columbia U., Santiago, Jose, /Fermilab, Wagner, C.E.M., & /Argonne /Chicago U., EFI /KICP, Chicago. Electroweak constraints on warped models with custodial symmetry. United States. doi:10.1103/PhysRevD.76.035006.
Carena, Marcela S., /Fermilab, Ponton, Eduardo, /Columbia U., Santiago, Jose, /Fermilab, Wagner, C.E.M., and /Argonne /Chicago U., EFI /KICP, Chicago. Mon . "Electroweak constraints on warped models with custodial symmetry". United States. doi:10.1103/PhysRevD.76.035006. https://www.osti.gov/servlets/purl/919105.
@article{osti_919105,
title = {Electroweak constraints on warped models with custodial symmetry},
author = {Carena, Marcela S. and /Fermilab and Ponton, Eduardo and /Columbia U. and Santiago, Jose and /Fermilab and Wagner, C.E.M. and /Argonne /Chicago U., EFI /KICP, Chicago},
abstractNote = {},
doi = {10.1103/PhysRevD.76.035006},
journal = {Phys.Rev.D76:035006,2007},
number = ,
volume = ,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}
  • It has been recently argued that realistic models with warped extra dimensions can have Kaluza-Klein particles accessible at the CERN Large Hadron Collider if a custodial symmetry, SU(2){sub V} x P{sub LR}, is used to protect the T parameter and the coupling of the left-handed bottom quark to the Z gauge boson. In this article we emphasize that such a symmetry implies that the loop corrections to both the T parameter and the Zb{sub L}[overline b]{sub L} coupling are calculable. In general, these corrections are correlated, can be sizable, and should be considered to determine the allowed parameter space regionmore » in models with warped extra dimensions and custodial symmetry, including Randall-Sundrum models with a fundamental Higgs, models of gauge-Higgs unification, and Higgsless models. As an example, we derive the constraints that arise on a representative model of gauge-Higgs unification from a global fit to the precision electroweak observables. A scan over the parameter space typically leads to a lower bound on the Kaluza-Klein excitations of the gauge bosons of about 2-3 TeV, depending on the configuration. In the fermionic sector one can have Kaluza-Klein excitations with masses of a few hundred GeV. We present the constraints on these light fermions from recent Tevatron searches, and explore interesting discovery channels at the LHC.« less
  • It has been recently argued that realistic models with warped extra dimensions can have Kaluza-Klein particles accessible at the CERN Large Hadron Collider if a custodial symmetry, SU(2){sub V}xP{sub LR}, is used to protect the T parameter and the coupling of the left-handed bottom quark to the Z gauge boson. In this article we emphasize that such a symmetry implies that the loop corrections to both the T parameter and the Zb{sub L}b{sub L} coupling are calculable. In general, these corrections are correlated, can be sizable, and should be considered to determine the allowed parameter space region in models withmore » warped extra dimensions and custodial symmetry, including Randall-Sundrum models with a fundamental Higgs, models of gauge-Higgs unification, and Higgsless models. As an example, we derive the constraints that arise on a representative model of gauge-Higgs unification from a global fit to the precision electroweak observables. A scan over the parameter space typically leads to a lower bound on the Kaluza-Klein excitations of the gauge bosons of about 2-3 TeV, depending on the configuration. In the fermionic sector one can have Kaluza-Klein excitations with masses of a few hundred GeV. We present the constraints on these light fermions from recent Tevatron searches, and explore interesting discovery channels at the LHC.« less
  • We show that a discrete exchange symmetry can give rise to realistic dark matter candidates in models with warped extra dimensions. We show how to realize our construction in a variety of models with warped extra dimensions and study in detail a realistic model of gauge-Higgs unification/composite Higgs in which the observed amount of dark matter is naturally reproduced. In this model, a realistic pattern of electroweak symmetry breaking typically occurs in a region of parameter space in which the fit to the electroweak precision observables improves, the Higgs is heavier than the experimental bound and new light quark resonancesmore » are predicted. We also quantify the fine-tuning of such scenarios, and discuss in which sense gauge-Higgs unification models result in a natural theory of electroweak symmetry breaking.« less
  • We introduce a minimal supersymmetric extension of a Higgsless model for electroweak symmetry breaking in a warped extra dimension. In contrast to the nonsupersymmetric version, our model naturally contains a candidate for cold dark matter. No Kaluza-Klein parity is required, because its stability is guaranteed by an R-parity. We discuss the regions in parameter space that are compatible with the observed dark matter content of our Universe and are allowed by electroweak precision measurements as well as direct searches.