Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The sum rule for the polarized structure function $g_2$ corresponding to
  the moment at $n=0$   In the small $Q^2$ region, the sum rule for the polarized structure function
$g_2$ corresponding to the moment at $n=0$ is derived. This sum rule shows that
there is a tight connection among the resonances,the elastic and the continuum
in the $g_2$. Further, the Born term contribution in this sum rule is
proportional to $Q^2$ and very small compared with that in the corresponding
sum rule for the polarized structure function $g_1$. However, the Born term
contribution divided by $Q^2/2$ which also appears in the Schwinger sum rule
for the $g_2$ corresponding to the moment at $n=1$ has a very similar behavior
with that in the sum rule for the $g_1$ corresponding to the moment at $n=0$.

3
The categories of this paper are: physics
4
The categories of this paper are: cond-mat
35
The categories of this paper are: mtrl-th
22
The categories of this paper are: chao-dyn
7
The categories of this paper are: hep-th
37
The categories of this paper are: supr-con
13
The categories of this paper are: quant-ph
26
The categories of this paper are: bayes-an
2
The categories of this paper are: math
18
The categories of this paper are: econ
11
The categories of this paper are: hep-lat
10
The categories of this paper are: q-bio
14
The categories of this paper are: math-ph
28
The categories of this paper are: alg-geom
30
The categories of this paper are: q-alg
15
The categories of this paper are: nucl-ex