Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2000-11-17
Phys.Lett. B500 (2001) 149-160
Physics
High Energy Physics
High Energy Physics - Phenomenology
15 pages, 1 Latex file
Scientific paper
10.1016/S0370-2693(01)00065-X
We discuss the structure of infrared and ultraviolet singularities in on-shell QCD and supersymmetric QCD amplitudes at one-loop order. Previous results, valid for massless partons, are extended to the case of massive partons. Using dimensional regularization, we present a general factorization formula that controls both the singular epsilon-poles and the logarithmic contributions that become singular for vanishing masses. We introduce generalized Altarelli--Parisi splitting functions and discuss their relations with the singular terms in the amplitudes. The dependence on the regularization scheme is also considered.
Catani Stefano
Dittmaier Stefan
Trocsanyi Zoltan
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