Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Measurement of the Spin-Dependent Structure Function $g_1(x)$ of the
  Proton   We have measured the spin-dependent structure function $g_1^p$ of the proton
in deep inelastic scattering of polarized muons off polarized protons, in the
kinematic range $0.003<x<0.7$ and $1\,\mbox{GeV}^2<Q^2<60\,\mbox{GeV}^2$. Its
first moment, $\int_0^1 g_1^p(x) dx $, is found to be $0.136 \pm
0.011\,(\mbox{stat.})\pm 0.011\,(\mbox{syst.})$ at $Q^2=10\,\mbox{GeV}^2$. This
value is smaller than the prediction of the Ellis--Jaffe sum rule by two
standard deviations, and is consistent with previous measurements. A combined
analysis of all available proton, deuteron and neutron data confirms the
Bjorken sum rule to within $10\%$ of the theoretical value.

1
The categories of this paper are: cs
19
The categories of this paper are: eess
20
The categories of this paper are: acc-phys
11
The categories of this paper are: hep-lat
30
The categories of this paper are: q-alg
7
The categories of this paper are: hep-th
10
The categories of this paper are: q-bio
4
The categories of this paper are: cond-mat
15
The categories of this paper are: nucl-ex
28
The categories of this paper are: alg-geom
23
The categories of this paper are: solv-int
35
The categories of this paper are: mtrl-th
12
The categories of this paper are: nucl-th
34
The categories of this paper are: chem-ph
16
The categories of this paper are: stat
18
The categories of this paper are: econ