Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Alignment function as a new kind of transverse momentum dependent
  functions   We argue the existence of new $k_\perp$-dependent functions which can be
manifested in the Drell-Yan (SIDIS)-like processes. The presented new functions
resemble the well-known Boer-Mulders function associated with the quark spin
asymmetry, but in contrast they are sensitive to the transverse motion of
partons inside the hadron due to the collective alignment of quark spin
vectors.

37
The categories of this paper are: supr-con
13
The categories of this paper are: quant-ph
30
The categories of this paper are: q-alg
1
The categories of this paper are: cs
2
The categories of this paper are: math
27
The categories of this paper are: comp-gas
4
The categories of this paper are: cond-mat
31
The categories of this paper are: ao-sci
16
The categories of this paper are: stat
18
The categories of this paper are: econ
28
The categories of this paper are: alg-geom
8
The categories of this paper are: hep-ex
24
The categories of this paper are: dg-ga
5
The categories of this paper are: gr-qc
12
The categories of this paper are: nucl-th
20
The categories of this paper are: acc-phys