Towards colour flow evolution at two loops

Author(s)
Simon Plätzer, Ines Ruffa
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.

Organisation(s)
Particle Physics, Research Platform Erwin Schrödinger International Institute for Mathematics and Physics
Journal
Journal of High Energy Physics
Volume
2021
No. of pages
36
ISSN
1029-8479
DOI
https://doi.org/10.1007/JHEP06(2021)007
Publication date
06-2021
Peer reviewed
Yes
Austrian Fields of Science 2012
103012 High energy physics, 103034 Particle physics
Keywords
Portal url
https://ucris.univie.ac.at/portal/en/publications/towards-colour-flow-evolution-at-two-loops(1a8e85af-d8ec-4541-b5c6-bfa1906713a1).html