A simple formula for the infrared singular part of the integrand of one-loop QCD amplitudes

Details A simple formula for the infrared singular part of the integrand of one-loop QCD amplitudes A simple formula for the infrared singular part of the integrand of one-loop QCD amplitudes

2009-12-09

arxiv.org/abs/0912.1680v2

Phys.Rev.D81:094002,2010

Physics

High Energy Physics

High Energy Physics - Phenomenology

5 pages, version to be published

Scientific paper

10.1103/PhysRevD.81.094002

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 counter-term for the infrared singularities and can be used as an ingredient for the numerical calculation of one-loop amplitudes.

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