Abstract
Certain string theory constructions are representative of the so-called hidden sector scenarios in which the hidden particles interact with the Standard Model matter fields through the exchange of massive Z′ bosons. We show that such string motivated Stückelberg portals naturally lead to isospin violating interactions of DM particles with nuclei in direct detection experiments. We find that the ratios between the DM coupling to neutrons and protons for both, spin-independent (fn/fp) and spin-dependent (an/ap) interactions, are generically different from ±1, and depend on the charges of the quarks under the extra U(1) gauge groups. In order to find the experimentally allowed values of these ratios, we have incorporated constraints from searches for dijet and dilepton resonances at the LHC as well as LUX bounds on the elastic scattering of DM off nucleons. Our results highlight the importance of combining different search methods to shed light on this sort of scenarios.
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