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Simple formula for the infrared singular part of the integrand of one-loop QCD amplitudes
Phys. Rev. D 81, 094002 – Published 3 May, 2010
DOI: https://doi.org/10.1103/PhysRevD.81.094002
Abstract
We show that a well-known simple formula for the explicit infrared poles of one-loop QCD amplitudes has a corresponding simple counterpart in unintegrated form. The unintegrated formula approximates the integrand of one-loop QCD amplitudes in all soft and collinear singular regions. It thus defines a local counterterm for the infrared singularities and can be used as an ingredient for the numerical calculation of one-loop amplitudes.
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