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.