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We discuss the role that higher derivative operators play in field theoryorbifold compactifications on S_1/Z_2 with local and non-local (Scherk-Schwarz)breaking of supersymmetry. Integrating out the bulk fields generatesbrane-localised higher derivative counterterms to the mass of the brane (orzero-mode of the bulk) scalar field, identified with the Higgs field in manyrealistic models. Both Yukawa and gauge interactions are considered and theone-loop results found can be used to study the ``running'' of the scalar fieldmass with respect to the momentum scale in 5D orbifolds. In particular thisallows the study of the behaviour of the mass under UV scaling of the momentum.The relation between supersymmetry breaking and the presence of higherderivative counterterms to the mass of the scalar field is investigated. Thisshows that, regardless of the breaking mechanism, (initial) supersymmetrycannot, in general, prevent the emergence of such operators. Some implicationsfor phenomenology of the higher derivative operators are also presented.Comment: 29 pages, LaTeX. Added Section 4 ("Phenomenological implications:  living with ghosts?") and Appendix

Higher derivative operators from transmission of supersymmetry breaking onS1/Z2

Higher derivative operators from transmission of supersymmetry breaking onS₁/Z₂