Calculation of Infrared-Divergent Feynman Diagrams with Zero Mass Threshold

Details Calculation of Infrared-Divergent Feynman Diagrams with Zero Mass Threshold Calculation of Infrared-Divergent Feynman Diagrams with Zero Mass Threshold

1997-04-18

arxiv.org/abs/hep-ph/9704353v2

Eur.Phys.J.C2:747-756,1998

Physics

High Energy Physics

High Energy Physics - Phenomenology

20 pages, Latex with epsf-figures, References updated, to appear in Z.Phys.C

Scientific paper

10.1007/s100520050179

Two-loop vertex Feynman diagrams with infrared and collinear divergences are investigated by two independent methods. On the one hand, a method of calculating Feynman diagrams from their small momentum expansion extended to diagrams with zero mass thresholds is applied. On the other hand, a numerical method based on a two-fold integral representation is used. The application of the latter method is possible by using lightcone coordinates in the parallel space. The numerical data obtained with the two methods are in impressive agreement.

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