Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Chromodynamic Lensing and $\perp$ Single Spin Asymmetries   The physical interpretation of generalized parton distributions (in the limit
$\xi=0$) as Fourier transforms of impact parameter dependent parton
distributions is discussed. Particular emphasis is put on the role of the
target polarization. For transversely polarized targets we expect a significant
deviation from axial symmetry for the distribution in the transverse plane. We
conjecture that this transverse distortion, in combination with the final state
provides a natural explanation for the sign of the Sivers contribution to
semi-inclusive single-spin asymmetries.

36
The categories of this paper are: cmp-lg
20
The categories of this paper are: acc-phys
14
The categories of this paper are: math-ph
2
The categories of this paper are: math
12
The categories of this paper are: nucl-th
22
The categories of this paper are: chao-dyn
30
The categories of this paper are: q-alg
32
The categories of this paper are: atom-ph
13
The categories of this paper are: quant-ph
26
The categories of this paper are: bayes-an
4
The categories of this paper are: cond-mat
10
The categories of this paper are: q-bio
24
The categories of this paper are: dg-ga
33
The categories of this paper are: plasm-ph
8
The categories of this paper are: hep-ex
15
The categories of this paper are: nucl-ex