The Singular Behaviour of QCD Amplitudes at Two-loop Order
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 -poles of the dimensionally regularized amplitudes. The dependence on the regularization scheme is considered and the coefficients of the 1/4, 1/3 and 1/2 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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