Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Recent theoretical progress in perturbative QCD   We review selected recent theoretical activity in perturbative QCD. We focus
on progress in the description of parton densities, including latest
developments in neural network parton densities, on the description of high
multiplicity final states at the LHC at leading and next-to-leading order, on
progress in next-to-next-to-leading order, and on novel developments in jets
physics.

22
The categories of this paper are: chao-dyn
17
The categories of this paper are: q-fin
13
The categories of this paper are: quant-ph
4
The categories of this paper are: cond-mat
12
The categories of this paper are: nucl-th
30
The categories of this paper are: q-alg
19
The categories of this paper are: eess
8
The categories of this paper are: hep-ex
35
The categories of this paper are: mtrl-th
14
The categories of this paper are: math-ph
16
The categories of this paper are: stat
15
The categories of this paper are: nucl-ex
20
The categories of this paper are: acc-phys
10
The categories of this paper are: q-bio
11
The categories of this paper are: hep-lat
24
The categories of this paper are: dg-ga