Stability of the Higgs mass in theories with extra dimensions

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)