Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Theta-Induced Electric Dipole Moment of the Neutron via QCD Sum Rules   Using the QCD sum rule approach, we calculate the electric dipole moment of
the neutron induced by a vacuum theta--angle to approximately 40-50% precision,
d_n = 2.4 x 10^{-16} \theta e.cm. Combined with the new experimental bound,
this translates into the limit |\theta|< 3 x 10^{-10}.

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The categories of this paper are: q-bio
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The categories of this paper are: gr-qc
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The categories of this paper are: ao-sci
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The categories of this paper are: nucl-ex
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The categories of this paper are: adap-org
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The categories of this paper are: bayes-an
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The categories of this paper are: acc-phys
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The categories of this paper are: hep-lat
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The categories of this paper are: nucl-th
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The categories of this paper are: cs
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The categories of this paper are: atom-ph
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The categories of this paper are: econ
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The categories of this paper are: astro-ph
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The categories of this paper are: math
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The categories of this paper are: quant-ph
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The categories of this paper are: funct-an