In models with a low quantum gravity scale, fast proton decay can be avoided by localizing quarks and leptons to separated positions in an extra $1/\mathrm{T}\mathrm{e}\mathrm{V}$ sized dimension with gauge and Higgs fields living throughout. Black holes with masses of the order of the quantum gravity scale are therefore expected to evaporate nonuniversally, preferentially radiating directly into quarks or leptons but not both. Should black holes be copiously produced at a future hadron collider, we find the ratio of final state jets to charged leptons to photons is $113:8:1$, which differs from previous analyses that assumed all standard model fields live at the same point in the extra dimensional space.

• Received 11 July 2002

DOI:https://doi.org/10.1103/PhysRevLett.90.031601