Stringy explanation of b → sℓ+ℓ− anomalies

We show that the recent anomalies in b → sℓ+ℓ− transitions observed by the LHCb collaboration can be accommodated within string motivated models with a low mass Z′ gauge boson. Such Z′ gauge boson can be obtained in compactifications with a low string scale. We consider a class of intersecting D-brane models in which different families of quarks and leptons are simultaneously realized at different D-brane intersections. The explanation of b → sℓ+ℓ− anomalies via a stringy Z′ sets important restrictions on these viable D-brane constructions.