Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the potential role of the Collins effect in A_N in pp --> pion X   Transverse single spin asymmetries in pp --> pion X processes, while on a
quite firm ground experimentally, are still a much debated phenomenological
issue. We consider them in a transverse momentum dependent factorization
scheme. After revisiting a previous result, we give new estimates of the
Collins contribution by adopting the latest information on the Collins and
transversity functions, as extracted from SIDIS and e+e- data.

18
The categories of this paper are: econ
17
The categories of this paper are: q-fin
29
The categories of this paper are: funct-an
2
The categories of this paper are: math
3
The categories of this paper are: physics
21
The categories of this paper are: adap-org
36
The categories of this paper are: cmp-lg
27
The categories of this paper are: comp-gas
5
The categories of this paper are: gr-qc
8
The categories of this paper are: hep-ex
34
The categories of this paper are: chem-ph
6
The categories of this paper are: astro-ph
13
The categories of this paper are: quant-ph
23
The categories of this paper are: solv-int
9
The categories of this paper are: nlin
15
The categories of this paper are: nucl-ex