Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Nucleon polarization in the process $e^+e^-\to N\bar{N}$ near threshold   The process $e^+e^- \rightarrow N\bar N$ is studied nearby a threshold with
account for polarizations of all initial and final particles. The nucleon
polarization $\bm \zeta^N$ reveals a strong energy dependence due to that of
the nucleon electromagnetic form factors $G_E(Q^2)$ and $G_M(Q^2)$ caused by
the final-state interaction of nucleons. It is shown that the modulus of the
ratio of these form factors and their relative phase can be determined by
measuring $\bm \zeta^N$ along with the differential cross section. The
polarization degree is analyzed using Paris $N\bar N$ optical potential for
calculation of the form factors. It turns out that $|\bm \zeta^N|$ is high
enough in a rather wide energy range above the threshold. Being especially high
for longitudinally polarized beams, $|\bm \zeta^N|$ is noticeable even if both
$e^+e^-$ beams are unpolarized.

7
The categories of this paper are: hep-th
14
The categories of this paper are: math-ph
4
The categories of this paper are: cond-mat
23
The categories of this paper are: solv-int
22
The categories of this paper are: chao-dyn
30
The categories of this paper are: q-alg
20
The categories of this paper are: acc-phys
26
The categories of this paper are: bayes-an
12
The categories of this paper are: nucl-th
24
The categories of this paper are: dg-ga
29
The categories of this paper are: funct-an
9
The categories of this paper are: nlin
37
The categories of this paper are: supr-con
16
The categories of this paper are: stat
25
The categories of this paper are: patt-sol
11
The categories of this paper are: hep-lat