Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Symmetry restoration of the soft pion corrections for the light sea
  quark distributions in the small $x$ region   The soft pion correction at high energy may play a crucial role in
non-perturbative parts of sea quark distributions. In this paper, we show that,
while the soft pion correction for the strange sea qaurk distribution is
suppressed in the large and the medium $x$ region compared with that for the up
and the down sea quark one, it can become large and SU(3) flavor symmetric in
the very small $x$ region. This gives us a good reason for the symmetry
restoration of light sea quark distributions required by the mean charge sum
rule for the light sea quarks. Then, by estimating this sum rule with the help
of the results obtained by the soft pion correction, it is argued that there is
a large symmetry restoration of the strange sea quark in the region from
$x=10^{-2}$ to $10^{-6}$ at $Q^2\sim 1$ GeV.

30
The categories of this paper are: q-alg
33
The categories of this paper are: plasm-ph
28
The categories of this paper are: alg-geom
23
The categories of this paper are: solv-int
31
The categories of this paper are: ao-sci
6
The categories of this paper are: astro-ph
13
The categories of this paper are: quant-ph
12
The categories of this paper are: nucl-th
14
The categories of this paper are: math-ph
26
The categories of this paper are: bayes-an
9
The categories of this paper are: nlin
1
The categories of this paper are: cs
25
The categories of this paper are: patt-sol
4
The categories of this paper are: cond-mat
15
The categories of this paper are: nucl-ex
2
The categories of this paper are: math