Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Next-to-leading order forward hadron production in the small-$x$ regime:
  rapidity factorization   Single inclusive hadron production at forward rapidity in high energy p+A
collisions is an important probe of the high gluon density regime of QCD and
the associated small-$x$ formalism. We revisit an earlier one-loop calculation
to illustrate the significance of the "rapidity factorization" approach in this
regime. Such factorization separates the very small-$x$ unintegrated gluon
density evolution and leads to a new correction term to the physical cross
section at one-loop level. Importantly, this rapidity factorization formalism
remedies the previous unphysical negative next-to-leading order contribution to
the cross section. It is much more stable with respect to "rapidity" variation
when compared to the leading-order calculation and provides improved agreement
between theory and experiment in the forward rapidity region.

7
The categories of this paper are: hep-th
18
The categories of this paper are: econ
14
The categories of this paper are: math-ph
4
The categories of this paper are: cond-mat
34
The categories of this paper are: chem-ph
2
The categories of this paper are: math
33
The categories of this paper are: plasm-ph
10
The categories of this paper are: q-bio
6
The categories of this paper are: astro-ph
17
The categories of this paper are: q-fin
35
The categories of this paper are: mtrl-th
24
The categories of this paper are: dg-ga
9
The categories of this paper are: nlin
5
The categories of this paper are: gr-qc
31
The categories of this paper are: ao-sci
29
The categories of this paper are: funct-an