The Singular Behaviour of QCD Amplitudes at Two-loop Order

Details The Singular Behaviour of QCD Amplitudes at Two-loop Order The Singular Behaviour of QCD Amplitudes at Two-loop Order

1998-02-26

arxiv.org/abs/hep-ph/9802439v1

Phys.Lett. B427 (1998) 161-171

Physics

High Energy Physics

High Energy Physics - Phenomenology

14 pages, latex, no figures

Scientific paper

10.1016/S0370-2693(98)00332-3

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 $1/\ep^4, 1/\ep^3$ and $1/\ep^2$ 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 $q{\bar q}$ pair.

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