Systematic approximation of multi-scale Feynman integrals

Abstract

An algorithm for the systematic analytical approximation of multi-scale Feynman integrals is presented. The algorithm produces algebraic expressions as functions of the kinematical parameters and mass scales appearing in the Feynman integrals, allowing for fast numerical evaluation. The results are valid in all kinematical regions, both above and below thresholds, up to in principle arbitrary orders in the dimensional regulator. The scope of the algorithm is demonstrated by presenting results for selected two-loop three-point and four-point integrals with an internal mass scale that appear in the two-loop amplitudes for Higgs+jet production.

31 pages + refs , 34 figures. v2 reflects the version published in JHEP. The case of integrals with multiple thresholds has been added, with new plots and text

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• NNLO soft function for threshold single inclusive jet production