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Right now I am facing some Feynman diagram calculations and in the instructions I am reading the phrase current-current diagram appears quite often so I wanted to know:
What is the definition of a current-current diagram?
A current-current diagram is a diagram in the diagrammatic expansion of a current-current amplitude. For the latter, see. e.g., equation (1.1) in
Keith Hamilton, The Standard Model Part II: Charged Current weak interactions I,
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