  The supersymmetric extensions of the Standard Model can tolerate quite a
large hierarchy between various supersymmetry breaking terms, a good example
being the models of split supersymmetry. However, theoretical models generating
such a stable hierarchy are not so easy to construct. An interesting idea
consists in coupling the brane localized gauge sector to extended
supergravities in the bulk of extra dimensions, and using different sources of
supersymmetry breaking in the bulk and on the brane. This in principle allows
one to separate the magnitude of the gravitino mass from the supersymmetry
breaking masses of gaugini and of charged matter. In this paper we present a
detailed analysis of a simple field theoretical model where such an idea is
realized. Departure from this symmetric set of boundary conditions breaks
R-symmetry, and gaugino masses are generated at one-loop order, however the
magnitude of the resulting soft gaugino masses is proportional to the
R-symmetry breaking Majorana-type gravitino mass which is continously
deformable to zero.

High Energy Physics - Phenomenology;High Energy Physics - Theory