Abstract
We analyse the ultraviolet stability of the Higgs mass in recently proposed Kaluza–Klein models compactified on S1/Z2 or S1/(Z2 × Z2'), both at the field theory and string theory level. Fayet–Iliopoulos terms of U(1) hypercharge are shown to be of vital importance for this discussion. Models with a single Higgs doublet seem to be generically affected by quadratic divergences.
(From the workshop 'Phenomonology Beyond the Standard Model', 6–11 May 2001)
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