Light Kaluza-Klein states in Randall-Sundrum models with custodial SU(2).

Journal Article · Fri Dec 01 04:00:00 EST 2006 · Nucl. Phys. B

DOI:https://doi.org/10.1016/j.nuclphysb.2006.10.012· OSTI ID:939069

Carena, M; Ponton, E; Santiago, J; Wagner, C E. M.; FNAL,

We consider Randall-Sundrum scenarios based on SU(2){sub L} x SU(2){sub R} and a discrete parity exchanging L with R. The custodial and parity symmetries can be used to make the tree level contribution to the T parameter and the anomalous couplings of the bottom quark to the Z very small. We show that the resulting quantum numbers typically induce a negative T parameter at one loop that, together with the positive value of the S parameter, restrict considerably these models. There are nevertheless regions of parameter space that successfully reproduce the fit to electroweak precision observables with light Kaluza-Klein excitations accessible at colliders. We consider models of gauge-Higgs unification that implement the custodial and parity symmetries and find that the electroweak data singles out a very well defined region in parameter space. In this region one typically finds light gauge boson Kaluza-Klein excitations as well as light Su(2){sub L}singlet, and sometimes also doublet, fermionic states, that mix with the top quark, and that may yield interesting signatures at future colliders.

• Research Organization: Argonne National Laboratory (ANL)
• Sponsoring Organization: SC
• DOE Contract Number: AC02-06CH11357
• OSTI ID: 939069
• Report Number(s): ANL-HEP-PR-06-53
• Journal Information: Nucl. Phys. B, Journal Name: Nucl. Phys. B Journal Issue: Dec. 2006 Vol. 759
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ACCURACY
BOSONS
PARITY
QUANTUM NUMBERS
QUARKS
T QUARKS