Large momentum expansion of two-loop self-energy diagrams with arbitrary masses

Details Large momentum expansion of two-loop self-energy diagrams with arbitrary masses Large momentum expansion of two-loop self-energy diagrams with arbitrary masses

1993-07-30

arxiv.org/abs/hep-ph/9307371v1

Nucl.Phys. B410 (1993) 325-342

Physics

High Energy Physics

High Energy Physics - Phenomenology

Preprint INLO-PUB--5/93 (Instituut-Lorentz, University of Leiden, February 1993), 19 pages, 5 figures (two fugures included in

Scientific paper

10.1016/0550-3213(93)90436-S

For two-loop two-point diagrams with arbitrary masses, an algorithm to derive the asymptotic expansion at large external momentum squared is constructed. By using a general theorem on asymptotic expansions of Feynman diagrams, the coefficients of the expansion are calculated analytically. For some two-loop diagrams occurring in the Standard Model, comparison with results of numerical integration shows that our expansion works well in the region above the highest physical threshold.

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