期刊
PHYSICS LETTERS B
卷 552, 期 1-2, 页码 48-56出版社
ELSEVIER
DOI: 10.1016/S0370-2693(02)03100-3
关键词
quantum chromodynamics; multi-loop amplitudes; resummation; color flow; anomalous dimensions; NLO and NNLO corrections; factorization
We explore the relation between resummation and explicit multi-loop calculations for QCD hard-scattering amplitudes. We describe how the factorization properties of amplitudes lead to the exponentiation of double and single poles at each order of perturbation theory. For these amplitudes, previously-observed relations between single and double poles in different 2 --> 2 processes can now be interpreted in terms of universal functions associated with external partons and process-dependent anomalous dimensions that describe coherent soft radiation. Catani's proposal for multiple poles in dimensionally-continued amplitudes emerges naturally. (C) 2002 Elsevier Science B.V. All rights reserved.
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