Asymptotic Expansions - Methods and Applications

Abstract

Different viewpoints on the asymptotic expansion of Feynman diagrams are reviewed. The relations between the field theoretic and diagrammatic approaches are sketched. The focus is on problems with large masses or large external momenta. Several recent applications also for other limiting cases are touched upon. Finally, the pros and cons of the different approaches are briefly discussed.

arXiv commentLatex, 21 pages, 26 figures included as ps-files, uses amsmath. Talk presented at the XXIII. School of Theoretical Physics, Ustron, Poland, 1999. The paper, is also available via anonymous ftp at ftp://ttpux2.physik.uni-karlsruhe.de/ttp99/ttp99-46/ or via www at http://www-ttp.physik.uni-karlsruhe.de/Preprints/