Intersecting $D$-brane theories motivate the existence of exotic $U(1)$ gauge bosons that only interact with the standard model through kinetic mixing with hypercharge. We analyze an effective field theory description of this effect and describe the implications of these exotic gauge bosons on precision electroweak, LHC, and ILC observables.

• Received 12 July 2006

DOI:https://doi.org/10.1103/PhysRevD.74.115017