Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A direct extraction of the Sivers distributions from spin asymmetries in
  pion and kaon leptoproduction   We present a point-by-point determination of the Sivers distributions from
hadron leptoproduction data. The method, which relies on some simple
assumptions, is based on the combined analysis of proton and deuteron
observables. We make use of the single-spin asymmetries measured by COMPASS in
semi-inclusive deep inelastic scattering of 160 GeV muons on transversely
polarized proton and deuteron targets.

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The categories of this paper are: q-bio
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The categories of this paper are: q-alg
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The categories of this paper are: hep-th
36
The categories of this paper are: cmp-lg
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The categories of this paper are: mtrl-th
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The categories of this paper are: nucl-th
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The categories of this paper are: comp-gas
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The categories of this paper are: dg-ga
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The categories of this paper are: econ
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The categories of this paper are: chem-ph
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The categories of this paper are: cs
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The categories of this paper are: cond-mat
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The categories of this paper are: hep-lat
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The categories of this paper are: bayes-an
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The categories of this paper are: adap-org
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The categories of this paper are: quant-ph