  We study possible deviations from the Standard Model in the reaction $e^+e^-
\to Z\phi$, where $\phi$ denotes a spinless neutral boson. We show how the $Z$
decay angular correlation can be used to extract detailed information on the
$\phi$ couplings, such as the parity of $\phi$, radiatively induced form factor
effects and possible CP violation in the scalar sector. Consequences of gauge
invariant dimension six operators are discussed as an example.
