Small-threshold behaviour of two-loop self-energy diagrams: some special cases

Physics – High Energy Physics – High Energy Physics - Phenomenology

Scientific paper

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7 pages, plain latex; talk given at DESY-Zeuthen Workshop "QCD and QED in Higher Order", Rheinsberg, April 1996, to appear in

Scientific paper

An algorithm to construct analytic approximations to two-loop diagrams
describing their behaviour at small non-zero thresholds is discussed. For some
special cases (involving two different-scale mass parameters), several terms of
the expansion are obtained.

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