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General consequences of mass mixing between the ordinary Z boson and arelatively light Z_d boson, the "dark" Z, arising from a U(1)_d gauge symmetry,associated with a hidden sector such as dark matter, are examined. New effectsbeyond kinetic mixing are emphasized. Z-Z_d mixing introduces a new source oflow energy parity violation well explored by possible future atomic parityviolation and planned polarized electron scattering experiments. Rare K (B)meson decays into pi (K) l^+ l^- (l = e, mu) and pi (K) nu anti-nu are found toalready place tight constraints on the size of Z-Z_d mixing. Thosesensitivities can be further improved with future dedicated searches at K and Bfactories as well as binned studies of existing data. Z-Z_d mixing can alsolead to the Higgs decay H -> Z Z_d, followed by Z -> l_1^+ l_1^- and Z_d ->l_2^+ l_2^- or "missing energy", providing a potential hidden sector discoverychannel at the LHC. An illustrative realization of these effects in a 2 Higgsdoublet model is presented.

"Dark" Z implications for Parity Violation, Rare Meson Decays, and Higgs Physics