All-order results for infrared and collinear singularities in massless gauge theories

Lance dixon, Einan Gardi, Lorenzo Magnea

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

We review recent results concerning the all-order structure of infrared and collinear divergences in massless gauge theory amplitudes. While the exponentiation of these divergences for nonabelian gauge theories has been understood for a long time, in the past couple of years we have begun to unravel the all-order structure of the anomalous dimensions that build up the perturbative exponent. In the large-Nc limit, all infrared and collinear divergences are determined by just three functions; one of them, the cusp anomalous dimension, plays a key role also for non-planar contributions. Indeed, all infrared and collinear divergences of massless gauge theory amplitudes with any number of hard partons may be captured by a surprisingly simple expression constructed as a sum over color dipoles. Potential corrections to this expression, correlating four or more hard partons at three loops or beyond, are tightly constrained and are currently under study.
Original languageUndefined/Unknown
Pages (from-to)1-6
Number of pages6
JournalProceedings of Science
Publication statusPublished - 26 Jan 2010
EventRADCOR 2009-9th International Symposium on Radioactive Corrections( Applications of Quantum Field Theory to Phenomenology) - Ascona, Switzerland
Duration: 25 Oct 200930 Oct 2009

Keywords / Materials (for Non-textual outputs)

  • hep-ph

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