期刊
NUOVO CIMENTO C-COLLOQUIA AND COMMUNICATIONS IN PHYSICS
卷 32, 期 5-6, 页码 137-157出版社
SOC ITALIANA FISICA
DOI: 10.1393/ncc/i2010-10528-x
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资金
- European Community [MRTN-CT-2006-035505]
- STFC [ST/G000522/1] Funding Source: UKRI
We review recent progress in determining the infrared singularity structure of on-shell scattering amplitudes in massless gauge theories. We present a simple ansatz where soft singularities of any scattering amplitude of massless partons, to any loop order, are written as a sum over colour dipoles, governed by the cusp anomalous dimension. We explain how this formula was obtained, as the simplest solution to a newly-derived set of equations constraining the singularity structure to all orders. We emphasize the physical ideas underlying this derivation: the factorization of soft and collinear modes, the special properties of soft gluon interactions, and the notion of the cusp anomaly. Finally, we briefly discuss potential multi-loop contributions going beyond the sum-over-dipoles formula, which cannot be excluded at present.
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