Counting tree diagrams: asymptotic results for QCD-like theories

Details Counting tree diagrams: asymptotic results for QCD-like theories Counting tree diagrams: asymptotic results for QCD-like theories

2001-10-17

arxiv.org/abs/hep-ph/0110225v2

Eur.Phys.J.C23:701-706,2002

Physics

High Energy Physics

High Energy Physics - Phenomenology

16 pages

Scientific paper

10.1007/s100520200889

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.

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