  In models with an extra U(1)' gauge boson family non-universal couplings to
the weak eigenstates of the standard model fermions generally induce
flavor-changing neutral currents. This phenomenon leads to interesting results
in various B meson decays, for which recent data indicate hints of new physics
involving significant contributions from b -> s transitions. We analyze the B_s
system, emphasizing the effects of a Z' on the mass difference and CP
asymmetries.
