$\frac{d\sigma }{d\Omega }$ for $e^{+}{e}^{-}\to hX$ is calculated for the most general electron-quark-heavy boson ("$t$-channel") or positron-quark-heavy boson ("$u$-channel") interaction together with the electrodynamic contribution using the naive parton model with collinear quark fragmentation to hadrons. No single $S$, $V$, $T$, $A$, or $P$ exchange gives isotropic $\frac{d\sigma }{d\Omega }$; $V$ and $A$ exchanges give closest to isotropic. Two linear combinations which give isotropic contributions from the direct quark-lepton interaction are given.

• Received 19 May 1975

DOI:https://doi.org/10.1103/PhysRevD.12.2903