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The left-handed sneutrino in the Minimal Supersymmetric Standard Model (MSSM)has been ruled out as a viable thermal dark matter candidate, due toconflicting constraints from direct detection experiments and from themeasurement of the dark matter relic density. The intrinsic fine-tuning problemof the MSSM, however, motivates an extension with a new U(1)' gauge symmetry.We show that in the U(1)'-extended MSSM the right-handed sneutrino becomes agood thermal dark matter candidate. We identify two generic parameter spaceregions where the combined constraints from relic density determinations,direct detection and collider searches are all satisfied.Comment: 5 pages, 3 figures. Version to appear in Phys. Rev.

Revival of the thermal sneutrino dark matter