Threshold behavior of Feynman diagrams: the master two-loop propagator

Abstract

An asymptotic expansion of the two-loop two-point ``master'' diagram with two masses $m$ and $M$, on the mass shell $Q^2=M^2$, is presented. The treatment of the non-analytical terms arising in the expansion around the branching point is discussed. Some details of the calculation of a new class of two-loop integrals are given.

Minor additions; to appear in Physics Letters B

References in corpus (3)

• Electroweak corrections to the muon anomalous magnetic moment
• Two-loop QCD corrections to $b\to c$ transitions at zero recoil
• Small-threshold behaviour of two-loop self-energy diagrams: two-particle thresholds

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