Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: How is transversity related to helicity for quarks and antiquarks inside
  the proton?   We consider the quark and antiquark transversity distributions inside a
polarized proton and we study how they are expected to be related to the
corresponding helicity distributions, both in sign and magnitude. Our
considerations lead to simple predictions in good agreement with their first
determination for light quarks from experimental data. We also give our
predictions for the light antiquarks transversity distributions, so far
unknown.

21
The categories of this paper are: adap-org
33
The categories of this paper are: plasm-ph
16
The categories of this paper are: stat
9
The categories of this paper are: nlin
3
The categories of this paper are: physics
34
The categories of this paper are: chem-ph
28
The categories of this paper are: alg-geom
13
The categories of this paper are: quant-ph
23
The categories of this paper are: solv-int
15
The categories of this paper are: nucl-ex
17
The categories of this paper are: q-fin
32
The categories of this paper are: atom-ph
5
The categories of this paper are: gr-qc
7
The categories of this paper are: hep-th
31
The categories of this paper are: ao-sci
6
The categories of this paper are: astro-ph