Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2006-07-11
Nucl.Phys.B759:202-227,2006
Physics
High Energy Physics
High Energy Physics - Phenomenology
35 pages, 7 figures
Scientific paper
10.1016/j.nuclphysb.2006.10.012
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.
Carena Marcela
Ponton Eduardo
Santiago Jose
Wagner Carlos E. M.
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