Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The two-loop soft current in dimensional regularization   The soft current describes the factorization behavior of quantum
chromodynamics (QCD) scattering amplitudes in the limit of vanishing energy of
one of the external partons. It is process-independent and can be expanded in a
perturbative series in the coupling constant. To all orders in the dimensional
regularization parameter, we compute the two-loop correction to the soft
current for processes involving two hard partons.

33
The categories of this paper are: plasm-ph
19
The categories of this paper are: eess
13
The categories of this paper are: quant-ph
25
The categories of this paper are: patt-sol
34
The categories of this paper are: chem-ph
29
The categories of this paper are: funct-an
18
The categories of this paper are: econ
30
The categories of this paper are: q-alg
20
The categories of this paper are: acc-phys
32
The categories of this paper are: atom-ph
16
The categories of this paper are: stat
11
The categories of this paper are: hep-lat
23
The categories of this paper are: solv-int
3
The categories of this paper are: physics
31
The categories of this paper are: ao-sci
12
The categories of this paper are: nucl-th