Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: What does kinematical target mass sensitivity in DIS reveal about hadron
  structure?   We study the role of purely external kinematical approximations in inclusive
deep-inelastic lepton--hadron scattering within QCD factorization, and consider
factorization with an exact treatment of the target hadron mass. We discuss how
an observed phenomenological improvement obtained by accounting for target mass
kinematics could be interpreted in terms of general properties of target
structure, and argue that such an improvement implies a hierarchy of
nonperturbative scales within the hadron.

1
The categories of this paper are: cs
14
The categories of this paper are: math-ph
15
The categories of this paper are: nucl-ex
35
The categories of this paper are: mtrl-th
17
The categories of this paper are: q-fin
19
The categories of this paper are: eess
29
The categories of this paper are: funct-an
36
The categories of this paper are: cmp-lg
34
The categories of this paper are: chem-ph
23
The categories of this paper are: solv-int
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The categories of this paper are: acc-phys
30
The categories of this paper are: q-alg
3
The categories of this paper are: physics
33
The categories of this paper are: plasm-ph
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The categories of this paper are: bayes-an
6
The categories of this paper are: astro-ph