  Cross-section, vector-polarization, and tensor-polarization distributions are
calculated for the reactions $e^+ e^- \rightarrow \bar{p}p$ and $e^+ e^-
\rightarrow \bar{\Lambda} \Lambda$. Each reaction requires six characteristic
functions that are bilinear in the, possibly complex, electromagnetic form
factors, denoted $G_E(P^2)$ and $G_M(P^2)$, of $p$ and $\Lambda$. For the
hyperon reaction also the joint-decay distributions of $\Lambda$ and
$\bar{\Lambda}$ are calculated. Their knowledge allow a complete determination
of the hyperon electromagnetic form factors, without measuring hyperon spins.
We explain how this is done in practice. For some tensor-polarization
components our results are in conflict with previously repeatedly published
distributions.
