Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Transverse momentum, factorization and the HERMES experiment   I present some results about transverse momentum dependent distribution and
fragmentation functions. Firstly I illustrate a simple model, with predictive
power about the energy behavior, for T-odd, chiral odd functions. Moreover I
propose a slight modification in extracting transversity from HERMES data, so
as to apply correctly factorization. Lastly I suggest a method for determining
the quark transverse polarization in an unpolarized or spinless hadron.

1
The categories of this paper are: cs
3
The categories of this paper are: physics
36
The categories of this paper are: cmp-lg
31
The categories of this paper are: ao-sci
29
The categories of this paper are: funct-an
25
The categories of this paper are: patt-sol
13
The categories of this paper are: quant-ph
9
The categories of this paper are: nlin
32
The categories of this paper are: atom-ph
10
The categories of this paper are: q-bio
20
The categories of this paper are: acc-phys
30
The categories of this paper are: q-alg
26
The categories of this paper are: bayes-an
11
The categories of this paper are: hep-lat
37
The categories of this paper are: supr-con
22
The categories of this paper are: chao-dyn