Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Polarized Parton Distributions in the Photon and Factorization Scheme
  Dependence   Spin-dependent parton distributions in the polarized virtual photon are
investigated in QCD up to the next-to-leading order (NLO). In the case
$\Lambda^2 \ll P^2 \ll Q^2$, where $-Q^2$ ($-P^2$) is the mass squared of the
probe (target) photon, parton distributions can be predicted completely up to
the NLO, but they are factorization-scheme-dependent. Parton distributions are
analyzed in four different factorization schemes and their scheme dependence
are discussed. Particular attentions are paid to the axial anomaly effect on
the first moments of quark parton distributions, and also to the large-$x$
behaviors of the parton distributions. Gluon distribution in the virtual photon
is found to be factorization-scheme independent up to the NLO.

28
The categories of this paper are: alg-geom
24
The categories of this paper are: dg-ga
31
The categories of this paper are: ao-sci
13
The categories of this paper are: quant-ph
32
The categories of this paper are: atom-ph
26
The categories of this paper are: bayes-an
30
The categories of this paper are: q-alg
10
The categories of this paper are: q-bio
12
The categories of this paper are: nucl-th
11
The categories of this paper are: hep-lat
14
The categories of this paper are: math-ph
6
The categories of this paper are: astro-ph
27
The categories of this paper are: comp-gas
1
The categories of this paper are: cs
36
The categories of this paper are: cmp-lg
22
The categories of this paper are: chao-dyn