Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: e+e- pair production from nucleon targets in the resonance region   We present consistent theoretical descriptions of the $\pi N \to e^+e^- N$
and $\gamma N \to e^+e^- N$ reactions on proton and neutron targets for total
center of mass energies $\sqrt s$ ranging between 1.50 GeV and 1.75 GeV. These
reactions are complementary to study the coupling of low-lying baryon
resonances to vector meson-nucleon channels. We show in particular how the
resonant structure of the amplitudes for both processes generates specific and
large quantum interferences between $\rho$- and $\omega$-meson decays into
$e^+e^-$ pairs. Data on the $\pi N \to e^+e^- N$ and $\gamma N \to e^+e^- N$
reactions are expected in the near future from the HADES program at GSI and
from dilepton studies with CLAS at JLab.

8
The categories of this paper are: hep-ex
26
The categories of this paper are: bayes-an
31
The categories of this paper are: ao-sci
19
The categories of this paper are: eess
30
The categories of this paper are: q-alg
33
The categories of this paper are: plasm-ph
23
The categories of this paper are: solv-int
2
The categories of this paper are: math
15
The categories of this paper are: nucl-ex
10
The categories of this paper are: q-bio
17
The categories of this paper are: q-fin
34
The categories of this paper are: chem-ph
29
The categories of this paper are: funct-an
35
The categories of this paper are: mtrl-th
16
The categories of this paper are: stat
27
The categories of this paper are: comp-gas