Towards Colour Flow Evolution at Two Loops
arXiv:2012.15215 · doi:10.1007/JHEP06(2021)007
Abstract
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.
arXiv comment38 pages, 2 tables, 2 figures and several diagrams, detailed appendices
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