Calculation of Feynman Diagrams from their Small Momentum Expansion

Details Calculation of Feynman Diagrams from their Small Momentum Expansion Calculation of Feynman Diagrams from their Small Momentum Expansion

1994-03-05

arxiv.org/abs/hep-ph/9403230v1

Z.Phys.C64:413-426,1994

Physics

High Energy Physics

High Energy Physics - Phenomenology

21 pages, Bielefeld Unviersity preprint BI-TP %%93-78

Scientific paper

10.1007/BF01560102

A new powerful method to calculate Feynman diagrams is proposed. It consists in setting up a Taylor series expansion in the external momenta squared (in general multivariable). The Taylor coefficients are obtained from the original diagram by differentiation and putting the external momenta equal to zero, which means a great simplification. It is demonstrated that it is possible to obtain by analytic continuation of the original series high precision numerical values of the Feynman integrals in the whole cut plane. For this purpose conformal mapping and subsequent resummation by means of Pad\'{e} approximants or Levin transformation are applied.

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