Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Polarization observables in the $e^+ e^- \rightarrow \bar{\Lambda}
  \Lambda$ reaction   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.

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The categories of this paper are: hep-ph
21
The categories of this paper are: adap-org
27
The categories of this paper are: comp-gas
17
The categories of this paper are: q-fin
20
The categories of this paper are: acc-phys
31
The categories of this paper are: ao-sci
34
The categories of this paper are: chem-ph
16
The categories of this paper are: stat
36
The categories of this paper are: cmp-lg
13
The categories of this paper are: quant-ph
30
The categories of this paper are: q-alg
23
The categories of this paper are: solv-int
26
The categories of this paper are: bayes-an
22
The categories of this paper are: chao-dyn
9
The categories of this paper are: nlin
7
The categories of this paper are: hep-th