Light Kaluza-Klein States in Randall-Sundrum Models with Custodial SU(2)

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dc.creatorCarena, Marcela
dc.creatorPonton, Eduardo
dc.creatorSantiago, Jose
dc.creatorWagner, Carlos E. M.
dc.date2006-07-11
dc.date2006-08-03
dc.date.accessioned2026-07-07T11:27:01Z
dc.date.available2026-07-07T11:27:01Z
dc.descriptionWe 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.
dc.description35 pages, 7 figures
dc.identifierhttps://arxiv.org/abs/hep-ph/0607106
dc.identifierhttp://arxiv.org/abs/hep-ph/0607106
dc.identifierNucl.Phys.B759:202-227,2006
dc.identifierdoi:10.1016/j.nuclphysb.2006.10.012
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/196020
dc.subjectHigh Energy Physics - Phenomenology
dc.titleLight Kaluza-Klein States in Randall-Sundrum Models with Custodial SU(2)
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