`Strategy of Regions': Expansions of Feynman Diagrams both in Euclidean and Pseudo-Euclidean Regimes

Details `Strategy of Regions': Expansions of Feynman Diagrams both in Euclidean and Pseudo-Euclidean Regimes `Strategy of Regions': Expansions of Feynman Diagrams both in Euclidean and Pseudo-Euclidean Regimes

2001-01-15

arxiv.org/abs/hep-ph/0101152v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

17 pages, LaTeX with axodraw.sty; Invited talk at RADCOR 2000 (Carmel CA, USA, Sept. 2000)

Scientific paper

The strategy of regions [1] turns out to be a universal method for expanding Feynman integrals in various limits of momenta and masses. This strategy is reviewed and illustrated through numerous examples. In the case of typically Euclidean limits it is equivalent to well-known prescriptions within the strategy of subgraphs. For regimes typical for Minkowski space, where the strategy of subgraphs has not yet been developed, the strategy of regions is characterized in the case of threshold limit, Sudakov limit and Regge limit.

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