Light Kaluza Klein States in Randall-Sundrum Models with Custodial SU(2)
Jul, 2006
34 pages
Published in:
- Nucl.Phys.B 759 (2006) 202-227
e-Print:
- hep-ph/0607106 [hep-ph]
Report number:
- ANL-HEP-PR-06-53,
- CU-TP-1152,
- EFI-06-08,
- FERMILAB-PUB-06-234-T
Citations per year
Abstract:
We consider Randall-Sundrum scenarios based on SU(2)_L x SU(2)_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 EW 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)_L singlet, and sometimes also doublet, fermionic states, that mix with the top quark, and may yield interesting signatures at future colliders.- Randall-Sundrum model
- symmetry: SU(2) x SU(2)
- symmetry: custodial
- Kaluza-Klein model
- correction: higher-order
- parity: discrete
- coupling: (Z0 quark antiquark)
- bottom
- quantum number
- coupling: gauge
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