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

By M. Carena, E. Pontón, J. Santiago, C. Wagner. 2006

213 citations recorded by the source corpus.

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.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/2a8b51ee70b2491daf9bf87c836133df2b405425

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Citations in the corpus

Light top partners and precision physics (2013, background): “oblique EW parameters due to fermion loops in this class of theories have been considered in the literature [65, 73, 74], however no divergent or enhanced contribution was noticed.”
The Composite Nambu-Goldstone Higgs (2015, background): “in a theory with only renormalizable interactions [170, 220].”
Electroweak and Flavour Structure of a Warped Extra Dimension with Custodial Protection (2009, background): “– The enlarged fermionic representations imply the presence of new heavy fermions that could be much lighter than the gauge KK modes [14, 15].”
ΔF = 2 observables and fine-tuning in a warped extra dimension with custodial protection (2008, background): “Recently realistic models of EW symmetry breaking (EWSB) have been constructed [7–12] and one can even achieve gauge coupling unification [13, 14].”
Discovering the top partners at the LHC using same-sign dilepton final states (2008, background): “[23], which reproduces the low-energy regime of the 5D models of [13, 14] (see also [24] for an alternative 4D construction).”