Numerical NLO QCD calculations

Details Numerical NLO QCD calculations Numerical NLO QCD calculations

2010-10-20

arxiv.org/abs/1010.4187v2

JHEP 1012:013,2010

Physics

High Energy Physics

High Energy Physics - Phenomenology

62 pages, version to be published

Scientific paper

10.1007/JHEP12(2010)013

We present an algorithm for the numerical calculation of one-loop QCD amplitudes. The algorithm consists of subtraction terms, approximating the soft, collinear and ultraviolet divergences of one-loop amplitudes and a method to deform the integration contour for the loop integration into the complex space. The algorithm is formulated at the amplitude level and does not rely on Feynman graphs. Therefore all required ingredients can be calculated efficiently using recurrence relations. The algorithm applies to massless partons as well as to massive partons.

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