Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Single-spin asymmetries and Qiu-Sterman effect(s)   I discuss the relation between the Qiu-Sterman effects on one hand and the
Collins, Sivers and Boer-Mulders effects on the other hand. It was suggested
before that some of these effects are in fact the same, thus providing
interesting connections between transverse-momentum dependent twist-2 functions
and collinear twist-3 functions. Here I propose an alternative way to reach
similar conclusions.

22
The categories of this paper are: chao-dyn
8
The categories of this paper are: hep-ex
29
The categories of this paper are: funct-an
4
The categories of this paper are: cond-mat
5
The categories of this paper are: gr-qc
37
The categories of this paper are: supr-con
2
The categories of this paper are: math
24
The categories of this paper are: dg-ga
30
The categories of this paper are: q-alg
26
The categories of this paper are: bayes-an
17
The categories of this paper are: q-fin
36
The categories of this paper are: cmp-lg
32
The categories of this paper are: atom-ph
9
The categories of this paper are: nlin
34
The categories of this paper are: chem-ph
14
The categories of this paper are: math-ph