On the radion mediation of the supersymmetry breaking in N=2, D=5 supergravity orbifolds

We discuss the on-shell N=1 supersymmetric coupling of brane chiral multiplets in the context of N=2, D=5 supergravity compactified on S1/Z2 orbifolds. Assuming a constant superpotential on the hidden brane we study the transmission of the supersymmetry breaking to the visible brane. We find that to lowest order in the five-dimensional Newton's constant k52 and gravitino mass m3/22 the spinor field of the radion multiplet is responsible of inducing positive one-loop squared masses mφ2∼m3/22/(MPlanck2R2) to the scalar fields which are localized on the visible brane with R the length scale of the fifth dimension. Considering a cubic superpotential on the visible brane we also find that non-vanishing soft trilinear scalar couplings A are induced given by A=3mφ2/m3/2.