Counting tree diagrams: asymptotic results for QCD-like theories

被引：2
|
作者：
Draggiotis, P [1 ]
Kleiss, R [1 ]
机构：
[1] Univ Nijmegen, NL-6500 GI Nijmegen, Netherlands
来源：
EUROPEAN PHYSICAL JOURNAL C | 2002年 / 23卷 / 04期
关键词：
D O I：
10.1007/s100520200889
中图分类号：
O412 [相对论、场论]; O572.2 [粒子物理学];
学科分类号：
摘要：
We discuss the enumeration of Feymnan 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.
引用
收藏
页码：701 / 706
页数：6
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