  If an extra supersymmetric U(1) gauge factor exists at the TeV energy scale,
which is then broken together with the supersymmetry, there will be several
interesting and important phenomenological consequences, not only at the TeV
scale, but also at the 100 GeV scale. For one, the generic two-doublet Higgs
structure will involve 3 additional parameters beyond that of the Minimal
Supersymmetric Standard Model (MSSM), thereby raising the upper bound on the
mass of the lighter of the two neutral Higgs scalars. For another, the
supersymmetric scalar quarks and leptons receive new contributions to their
masses from the spontaneous breaking of this extra U(1). Assuming a
grand-unified E_6 gauge symmetry and universal soft supersymmetry-breaking
terms at the grand-unification energy scale, we find solutions relating the
U(1) breaking scale and the ratio of the vacuum expectation values of the two
electroweak Higgs doublets.
