The Singular Behaviour of QCD Amplitudes at Two-loop Order

1998/02/26 by Stefano Catani · 1 citation
Physics and Astronomy · #hep-ph

paper · pdf · doi:10.1016/s0370-2693(98)00332-3

published as Phys.Lett. B427 (1998) 161-171 · 14 pages, latex, no figures

arxiv created 1998/02/26 · arxiv updated 2009/11/30

Abstract

We discuss the structure of infrared singularities in on-shell QCD amplitudes at two-loop order. We present a general factorization formula that controls all the \ep-poles of the dimensionally regularized amplitudes. The dependence on the regularization scheme is considered and the coefficients of the 1/\ep⁴, 1/\ep³ and 1/\ep² poles are explicitly given in the most general case. The remaining single-pole contributions are also explicitly evaluated in the case of amplitudes with a q q pair.

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