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Has anybody seen the perturbative expansion of the generating functional of QCD [tex] Z[J,\xi,\xi*,\eta,\eta*] [/tex] expressed with Feynman diagrams? I mean, there should be an expansion, containing external sources denoted by something like

-------o abbreviation for [tex] i \int d^4 x J [/tex]

-------# abbreviation for [tex] i \int d^4 x \eta [/tex]

and so on...

I haven't found any book showing this.

Is it maybe simply the sum of all possible graphs with their combinatorical prefactors that can be constructed from the Feynman rules?

Best regards Martin

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# Diagramatic perturbative expansion of QCD

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