Tadpoles and Symmetries in Higgs-Gauge Unification Theories

Details Tadpoles and Symmetries in Higgs-Gauge Unification Theories Tadpoles and Symmetries in Higgs-Gauge Unification Theories

2004-10-15

arxiv.org/abs/hep-ph/0410226v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages, based on talks given by M.Q. at String Phenomenology 2004, University of Michigan, Ann Arbor, August 1-6, 2004 and 1

Scientific paper

In theories with extra dimensions the Standard Model Higgs fields can be identified with internal components of bulk gauge fields (Higgs-gauge unification). The bulk gauge symmetry protects the Higgs mass from quadratic divergences, but at the fixed points localized tadpoles can be radiatively generated if U(1) subgroups are conserved, making the Higgs mass UV sensitive. We show that a global symmetry, remnant of the internal rotation group after orbifold projection, can prevent the generation of such tadpoles. In particular we consider the classes of orbifold compactifications T^d/Z_N (d even, N>2) and T^d/Z_2 (arbitrary d) and show that in the first case tadpoles are always allowed, while in the second they can appear only for d=2 (six dimensions).

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