Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spin Structure of the Proton from Polarized Inclusive Deep-Inelastic
  Muon-Proton Scattering   We have measured the spin-dependent structure function $g_1^p$ in inclusive
deep-inelastic scattering of polarized muons off polarized protons, in the
kinematic range $0.003 < x < 0.7$ and $1 GeV^2 < Q^2 < 60 GeV^2$. A
next-to-leading order QCD analysis is used to evolve the measured
$g_1^p(x,Q^2)$ to a fixed $Q^2_0$. The first moment of $g_1^p$ at $Q^2_0 = 10
GeV^2$ is $\Gamma^p = 0.136\pm 0.013(stat.) \pm 0.009(syst.)\pm 0.005(evol.)$.
This result is below the prediction of the Ellis-Jaffe sum rule by more than
two standard deviations. The singlet axial charge $a_0$ is found to be $0.28
\pm 0.16$. In the Adler-Bardeen factorization scheme, $\Delta g \simeq 2$ is
required to bring $\Delta \Sigma$ in agreement with the Quark-Parton Model. A
combined analysis of all available proton and deuteron data confirms the
Bjorken sum rule.

19
The categories of this paper are: eess
1
The categories of this paper are: cs
29
The categories of this paper are: funct-an
5
The categories of this paper are: gr-qc
30
The categories of this paper are: q-alg
25
The categories of this paper are: patt-sol
4
The categories of this paper are: cond-mat
36
The categories of this paper are: cmp-lg
34
The categories of this paper are: chem-ph
20
The categories of this paper are: acc-phys
28
The categories of this paper are: alg-geom
21
The categories of this paper are: adap-org
31
The categories of this paper are: ao-sci
12
The categories of this paper are: nucl-th
26
The categories of this paper are: bayes-an
33
The categories of this paper are: plasm-ph