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Near threshold expansion of Feynman diagrams
Journal of Mathematical Physics
The near threshold expansion of Feynman diagrams is derived from their configuration space representation, by performing all x integrations. The general scalar Feynman diagram is considered, with an arbitrary number of external momenta, an arbitrary number of internal lines and an arbitrary number of loops, in n dimensions and all masses may be different. The expansions are considered both below and above threshold. Rules, giving real and imaginary part, are derived. Unitarity of a sunsetdoi:10.1063/1.1947119 fatcat:lechlx7a2ve53bdmhw7dfrhghi