Asymptotic Expansions in Momenta and Masses and Calculation of Feynman Diagrams

Abstract

General results on asymptotic expansions of Feynman diagrams in momenta and/or masses are reviewed. It is shown how they are applied for calculation of massive diagrams.

Figures (3)

• Figure 1: Two-loop self-energy diagrams.
• Figure 2: The subgraphs contributing to the large momentum expansion (2).
• Figure 3: The subgraphs contributing to the large mass expansions (14) with zero thresholds. Thick and thin lines correspond respectively to massive and massless particles.