We show that, in string models with the minimal supersymmetric standard model residing on D-branes, the bino mass can be generated in a geometrically separated hidden sector. Hypercharge mediation thus naturally teams up with anomaly mediation. The mixed scenario predicts a distinctive yet viable superpartner spectrum, provided that the ratio $\alpha$ between the bino and gravitino mass lies in the range $0.05\lesssim |\alpha |\lesssim 0.25$ and $m_{3/2}\gtrsim 35\mathrm{TeV}$. We summarize some of the experimental signatures of this scenario.

• Received 27 November 2007

DOI:https://doi.org/10.1103/PhysRevLett.100.131804