Abstract
Wilson lines have a number of uses in non-abelian gauge theories. A topical example in QCD is the description of radiation in the soft or collinear limit, which must often be resummed to all orders in perturbation theory. Correlators involving a pair of Wilson lines are known to exponentiate in terms of special Feynman diagrams called “webs”. I will show how this language can be extended to an arbitrary number of Wilson lines, which introduces novel new combinatoric structures (web mixing matrices) of interest in their own right. I will also summarise recent results obtained from applying this formalism at three-loop order, before concluding with a list of open problems.
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White, C.D. Wilson Lines and Webs in Higher-Order QCD. Few-Body Syst 59, 8 (2018). https://doi.org/10.1007/s00601-017-1327-x
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DOI: https://doi.org/10.1007/s00601-017-1327-x