Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Single transverse-spin asymmetry for direct-photon and single-jet
  productions at RHIC   We study the single transverse-spin asymmetry for the inclusive direct-photon
and single-jet productions in the proton-proton collision based on the twist-3
mechanism in the collinear factorization. Taking into account all the effects
from the twist-3 quark-gluon correlation functions inside a transversely
polarized proton, we present a prediction for the asymmetries at the typical
RHIC kinematics. In both processes we find sizable asymmetries in the forward
region of the polarized proton while they are almost zero in the backward
region. This implies that if one finds a nonzero asymmetries in the backward
region in these processes, it should be ascribed wholely to the three-gluon
correlations. We also find the soft-gluon pole contribution is dominant and the
soft-fermion pole contribution is negligible in the whole Feynman-x region for
these asymmetries.

32
The categories of this paper are: atom-ph
19
The categories of this paper are: eess
30
The categories of this paper are: q-alg
23
The categories of this paper are: solv-int
12
The categories of this paper are: nucl-th
25
The categories of this paper are: patt-sol
20
The categories of this paper are: acc-phys
27
The categories of this paper are: comp-gas
33
The categories of this paper are: plasm-ph
31
The categories of this paper are: ao-sci
21
The categories of this paper are: adap-org
5
The categories of this paper are: gr-qc
14
The categories of this paper are: math-ph
17
The categories of this paper are: q-fin
10
The categories of this paper are: q-bio
24
The categories of this paper are: dg-ga