Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Investigation of the Second Moment of the Nucleon's g1 and g2 Structure
  Functions in Two-Flavor Lattice QCD   The reduced matrix elements a_2 and d_2 are computed in lattice QCD with
N_f=2 flavors of light dynamical (sea) quarks. For proton and neutron targets
we obtain as our best estimates d_2^(p)=0.004(5) and d_2^(n)=-0.001(3),
respectively, in the MSbar scheme at Q^2=5 GeV^2, while for a_2 we find
a_2^(p)=0.077(12) and a_2^(n)=-0.005(5), where the errors are purely
statistical.

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The categories of this paper are: nucl-ex
29
The categories of this paper are: funct-an
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The categories of this paper are: ao-sci
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The categories of this paper are: eess
9
The categories of this paper are: nlin
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The categories of this paper are: q-fin
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The categories of this paper are: chem-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: bayes-an
4
The categories of this paper are: cond-mat
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The categories of this paper are: chao-dyn
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The categories of this paper are: hep-ex
10
The categories of this paper are: q-bio
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The categories of this paper are: quant-ph
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The categories of this paper are: solv-int
2
The categories of this paper are: math