Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quark-quark Double Scattering and Modified (Anti-)Quark Fragmentation
  Functions in Nuclei   Quark-quark double scattering in eA DIS and its contribution to quark and
anti-quark fragmentation functions are investigated with the generalized
factorization of the relevant twist-four processes in pQCD. It is shown that
the resulting modifications to quark and anti-quark fragmentation functions are
different. While the numerical size of these effects cannot be determined from
pQCD, the structure of our result leads to a number of qualitative predictions
for the relative size of the effect for different hadrons. These qualitative
predictions agree with the multiplicity ratios for positive and negative
hadrons as observed by HERMES.

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The categories of this paper are: astro-ph
9
The categories of this paper are: nlin
24
The categories of this paper are: dg-ga
35
The categories of this paper are: mtrl-th
17
The categories of this paper are: q-fin
23
The categories of this paper are: solv-int
3
The categories of this paper are: physics
13
The categories of this paper are: quant-ph
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The categories of this paper are: adap-org
26
The categories of this paper are: bayes-an
37
The categories of this paper are: supr-con
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The categories of this paper are: eess
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The categories of this paper are: econ
10
The categories of this paper are: q-bio
1
The categories of this paper are: cs
33
The categories of this paper are: plasm-ph