Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Single-Spin Asymmetries and Transversity   A pedagogical introduction to single-spin asymmetries (SSA's) and
transversity is presented. Discussion in some detail is made of certain aspects
of (SSA's) in lepton-nucleon and in hadron-hadron scattering and the role of
pQCD and evolution in the context of transversity.

29
The categories of this paper are: funct-an
26
The categories of this paper are: bayes-an
2
The categories of this paper are: math
32
The categories of this paper are: atom-ph
31
The categories of this paper are: ao-sci
18
The categories of this paper are: econ
37
The categories of this paper are: supr-con
35
The categories of this paper are: mtrl-th
27
The categories of this paper are: comp-gas
9
The categories of this paper are: nlin
13
The categories of this paper are: quant-ph
17
The categories of this paper are: q-fin
12
The categories of this paper are: nucl-th
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The categories of this paper are: eess
23
The categories of this paper are: solv-int
25
The categories of this paper are: patt-sol