Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Self-energy of Nucleon for the Photon-proton Elastic Scattering and
  the Electromagnetic Polarizability   The effect of the self-energy on the photon-proton elastic scattering is
investigated for the backward and the forward directions. The shape of the
Thomson scattering at the photon energy $\omega \to 0$ is broken by taking into
account the self-energy of proton. The electromagnetic polarizabilities
$\bar{\alpha}\pm\bar{\beta}$ are calculated by the lowest-order perturbative
treatment.

22
The categories of this paper are: chao-dyn
8
The categories of this paper are: hep-ex
23
The categories of this paper are: solv-int
1
The categories of this paper are: cs
27
The categories of this paper are: comp-gas
6
The categories of this paper are: astro-ph
37
The categories of this paper are: supr-con
13
The categories of this paper are: quant-ph
30
The categories of this paper are: q-alg
25
The categories of this paper are: patt-sol
28
The categories of this paper are: alg-geom
9
The categories of this paper are: nlin
21
The categories of this paper are: adap-org
4
The categories of this paper are: cond-mat
15
The categories of this paper are: nucl-ex
29
The categories of this paper are: funct-an