Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Recent Developments in Perturbative QCD   I review recent progress in perturbative QCD on two fronts: extending
next-to-next-to-leading order QCD corrections to a broader range of collider
processes, and applying twistor-space methods (and related spinoffs) to
computations of multi-parton scattering amplitudes.

33
The categories of this paper are: plasm-ph
26
The categories of this paper are: bayes-an
29
The categories of this paper are: funct-an
7
The categories of this paper are: hep-th
12
The categories of this paper are: nucl-th
13
The categories of this paper are: quant-ph
6
The categories of this paper are: astro-ph
18
The categories of this paper are: econ
23
The categories of this paper are: solv-int
31
The categories of this paper are: ao-sci
35
The categories of this paper are: mtrl-th
21
The categories of this paper are: adap-org
37
The categories of this paper are: supr-con
15
The categories of this paper are: nucl-ex
34
The categories of this paper are: chem-ph
36
The categories of this paper are: cmp-lg