Counting tree diagrams: asymptotic results for QCD-like theories
University of Nijmegen, 6500 GI, Nijmegen, The Netherlands
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Published online: 5 April 2002
We discuss the enumeration of Feynman diagrams at tree order for processes with external lines of different types. We show how this can be done by iterating algebraic Schwinger–Dyson equations. Asymptotic estimates for very many external lines are derived. Applications include QED, QCD and scalar QED, and the asymptotic estimates are numerically confronted with the exact results.
© Springer-Verlag Berlin Heidelberg / Società Italiana di Fisica, 2002