Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: AAC analysis of polarized parton distributions with uncertainties   We report recent studies of the Asymmetry Analysis Collaboration (AAC) on
polarized parton distribution functions (PDFs). Using the data on the spin
symmetry A_1 in deep inelastic lepton scattering, we investigate optimum
polarized PDFs. Their uncertainties are estimated by the Hessian method. The
uncertainties are large for the polarized antiquark and gluon distributions. We
discuss the role of accurate SLAC-E155 proton data on the determination of the
PDFs. The obtained distributions are compared with other parametrization
results.

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The categories of this paper are: stat
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The categories of this paper are: gr-qc
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The categories of this paper are: astro-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: atom-ph
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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: dg-ga
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The categories of this paper are: supr-con
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The categories of this paper are: alg-geom
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The categories of this paper are: mtrl-th
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The categories of this paper are: q-bio
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The categories of this paper are: chao-dyn
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The categories of this paper are: funct-an
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The categories of this paper are: eess
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The categories of this paper are: plasm-ph