Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Global QCD Analysis of Parton Structure of the Nucleon: CTEQ5 Parton
  Distributions   An up-to-date global QCD analysis of high energy lepton-hadron and
hadron-hadron interactions is performed to better determine the gluon and quark
parton distributions in the nucleon. Improved experimental data on inclusive
jet production, in conjunction with precise deep inelastic scattering data,
place good constraints on the gluon over a wide range of x; while new data on
asymmetries in Drell-Yan processes contribute to better determine the d/u
ratio. Comparisons with results of other recent global analyses are made, and
the differences are described. Open issues and the general problem of
determining the uncertainties of parton distributions are discussed.

14
The categories of this paper are: math-ph
28
The categories of this paper are: alg-geom
4
The categories of this paper are: cond-mat
30
The categories of this paper are: q-alg
12
The categories of this paper are: nucl-th
35
The categories of this paper are: mtrl-th
27
The categories of this paper are: comp-gas
17
The categories of this paper are: q-fin
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The categories of this paper are: hep-lat
33
The categories of this paper are: plasm-ph
2
The categories of this paper are: math
16
The categories of this paper are: stat
1
The categories of this paper are: cs
37
The categories of this paper are: supr-con
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The categories of this paper are: eess
23
The categories of this paper are: solv-int