Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: High-energy QCD amplitudes at two loops and beyond   Recent progress in our understanding of infrared singularities of
multi-parton amplitudes has shown that the simplest form of Regge factorization
for high-energy gauge-theory amplitudes fails starting at
next-to-next-to-leading logarithmic accuracy. We provide a framework to
organize the calculation of parton amplitudes at leading power in t/s, in terms
of factorizing and non-factorizing contributions. This allows us to give
explicit expressions for the leading Reggeization-breaking terms in two-loop
and three-loop quark and gluon amplitudes in QCD. In particular, using only
infrared information, we recover a known non-factorizing, non-logarithmic
double-pole contribution at two-loops, and we compute the leading
non-factorizing single-logarithmic contributions at three loops.

25
The categories of this paper are: patt-sol
33
The categories of this paper are: plasm-ph
21
The categories of this paper are: adap-org
14
The categories of this paper are: math-ph
26
The categories of this paper are: bayes-an
23
The categories of this paper are: solv-int
10
The categories of this paper are: q-bio
29
The categories of this paper are: funct-an
12
The categories of this paper are: nucl-th
24
The categories of this paper are: dg-ga
2
The categories of this paper are: math
22
The categories of this paper are: chao-dyn
30
The categories of this paper are: q-alg
31
The categories of this paper are: ao-sci
13
The categories of this paper are: quant-ph
11
The categories of this paper are: hep-lat