2010/01/26 by Lance J. Dixon, Einan Gardi, Dixon, Lance J. +3
Physics and Astronomy · #Black Holes and Theoretical Physics #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions
paper · pdf · doi:10.48550/arxiv.1001.4709
openalex publication_date 2010/01/26 · openalex created_date 2019/06/27 · openalex updated_date 2026/07/28
We review recent results concerning the all-order structure of infrared and\ncollinear divergences in massless gauge theory amplitudes. While the\nexponentiation of these divergences for nonabelian gauge theories has been\nunderstood for a long time, in the past couple of years we have begun to\nunravel the all-order structure of the anomalous dimensions that build up the\nperturbative exponent. In the large-Nc limit, all infrared and collinear\ndivergences are determined by just three functions; one of them, the cusp\nanomalous dimension, plays a key role also for non-planar contributions.\nIndeed, all infrared and collinear divergences of massless gauge theory\namplitudes with any number of hard partons may be captured by a surprisingly\nsimple expression constructed as a sum over color dipoles. Potential\ncorrections to this expression, correlating four or more hard partons at three\nloops or beyond, are tightly constrained and are currently under study.\n