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Hidden sector scenarios in which dark matter (DM) interacts with the StandardModel matter fields through the exchange of massive Z' bosons are wellmotivated by certain string theory constructions. In this work, we thoroughlystudy the phenomenological aspects of such scenarios and find that they presenta clear and testable consequence for direct DM searches. We show that suchstring motivated St\"uckelberg portals naturally lead to isospin violatinginteractions of DM particles with nuclei. We find that the relations betweenthe DM coupling to neutrons and protons for both, spin-independent (fn/fp) andspin-dependent (an/ap) interactions, are very flexible depending on the chargesof the quarks under the extra U(1) gauge groups. We show that within thisconstruction these ratios are generically different from plus and minus 1 (i.e.different couplings to protons and neutrons) leading to a potentiallymeasurable distinction from other popular portals. Finally, we incorporatebounds from searches for dijet and dilepton resonances at the LHC as well asLUX bounds on the elastic scattering of DM off nucleons to determine theexperimentally allowed values of fn/fp and an/ap.

Isospin violating dark matter in St\"uckelberg portal scenarios