Abstract
We examine distributions of leptons produced in e
+
e
-
collisions, by a family nonuniversal extra gauge boson Z
′
, suggested by the
model, and by other neutral gauge bosons occurring in left–right symmetric models and in superstring-inspired E
6
models. We discuss how to distinguish the models by examining the couplings to fermions of the extra Z-boson through its leptonic production cross sections and asymmetries. We show how the universality violation inherent in the
model enhances the discovery potential of Z
′
at future planned and proposed e
+
e
-
colliders.