Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2008-09-23
JHEP0811:025,2008
Physics
High Energy Physics
High Energy Physics - Phenomenology
Added comment on gauge invariance, added references, typos removed. Version to appear in JHEP
Scientific paper
10.1088/1126-6708/2008/11/025
We show that the S parameter is not finite in theories of electroweak symmetry breaking in a slice of anti--de Sitter five-dimensional space, with the light fermions localized in the ultraviolet. We compute the one-loop contributions to S from the Higgs sector and show that they are logarithmically dependent on the cutoff of the theory. We discuss the renormalization of S, as well as the implications for bounds from electroweak precision measurements on these models. We argue that, although in principle the choice of renormalization condition could eliminate the S parameter constraint, a more consistent condition would still result in a large and positive S. On the other hand, we show that the dependence on the Higgs mass in S can be entirely eliminated by the renormalization procedure, making it impossible in these theories to extract a Higgs mass bound from electroweak precision constraints.
Burdman Gustavo
Rold Leandro Da
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