Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Towards Colour Flow Evolution at Two Loops   We calculate the two-loop and one-loop/one-emission contributions required
for soft gluon evolution at the next-to-leading order. The colour structures
are expressed in the colour flow basis, and the kinematic dependence and loop
integrals are expressed in terms of multiple cuts and phase-space-like
integrals. This directly allows to use them in the resummation of non-global
observables and improved parton shower algorithms beyond the leading order and
beyond the leading colour limit. Within the colour flow basis it becomes
apparent that correlations beyond a dipole picture emerge even in
colour-diagonal elements of the virtual corrections.

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The categories of this paper are: patt-sol
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The categories of this paper are: supr-con
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The categories of this paper are: hep-th
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The categories of this paper are: atom-ph
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The categories of this paper are: physics
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The categories of this paper are: adap-org
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The categories of this paper are: q-alg
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The categories of this paper are: hep-lat
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The categories of this paper are: math
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The categories of this paper are: mtrl-th
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The categories of this paper are: dg-ga
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The categories of this paper are: acc-phys
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The categories of this paper are: bayes-an
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The categories of this paper are: astro-ph
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The categories of this paper are: cs
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The categories of this paper are: econ