• Corpus ID: 250644076

Two-Loop Infrared Renormalization with On-shell Methods

@inproceedings{Baratella2022TwoLoopIR,
  title={Two-Loop Infrared Renormalization with On-shell Methods},
  author={Pietro Baratella},
  year={2022}
}

• P. Baratella
• Published 18 July 2022
• Physics

Within the framework proposed by Caron-Huot and Wilhelm, we give a recipe for computing infrared anomalous dimensions purely on-shell, efficiently up to two loops in any massless theory. After introducing the general formalism and reviewing the one-loop recipe, we extract a practical formula that relates two-loop infrared anomalous dimensions to certain two- and three-particle phase space integrals with tree-level form factors of conserved operators. We finally provide several examples of the use of the two-loop formula and comment on some of its formal aspects, especially the cancellation of ‘one-loop squared’ spurious terms.