Hadronic-energy correlations at theZ0

The energy-energy correlations produced in $e^{-}{e}^{+}\to Z^0\to \mathrm{hadrons}$ are investigated. We show that this process measures exactly the same hadronic structure functions determined by $e^{-}{e}^{+}\to \gamma \to \mathrm{hadrons}$, but that the two processes differ in their dependence on "external" angles when the initial leptons are polarized. Measurements of the energy-energy correlation at the $Z^0$ are important since the nonperturbative hadronization corrections to the perturbative QCD reaction are not significant at this high energy.