Small-threshold behaviour of two-loop self-energy diagrams: some special cases
F. A. Berends, A. I. Davydychev, V. A. Smirnov
Abstract
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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