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We tested several models in which the Standard Model (SM) gauge group isextended by an additional U(1) gauge symmetry, against available electroweakprecision data to impose limits on the mass of the neutral Z' boson, M_Z',predicted in all such models, and on the Z-Z' mixing angle, theta_ZZ', at 95%C.L. We found lower limits on M_Z' of order 1 TeV in most cases, whiletheta_ZZ' was found to be constrained to very small values.

Constraints on the mass and mixing of Z' bosons