Hypercharged anomaly mediation

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 α between the bino and gravitino mass lies in the range 0.05|α|0.25 and m3/2 35TeV. We summarize some of the experimental signatures of this scenario.