ZERO-THRESHOLD EXPANSION OF 2-LOOP SELF-ENERGY DIAGRAMS

被引：42

作者：

BERENDS, FA

DAVYDYCHEV, AI

SMIRNOV, VA

TAUSK, JB

机构：

[1] UNIV BERGEN,DEPT PHYS,N-5007 BERGEN,NORWAY

[2] MOSCOW MV LOMONOSOV STATE UNIV,INST NUCL PHYS,MOSCOW 119899,RUSSIA

[3] UNIV DURHAM,DEPT PHYS,DURHAM DH1 3LE,ENGLAND

来源：

NUCLEAR PHYSICS B | 1995年 / 439卷 / 03期

关键词：

D O I：

10.1016/0550-3213(95)00018-N

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：

An algorithm is constructed to derive a small-momentum expansion for two-loop two-point diagrams in all cases where, due to the presence of physical thresholds, there are singularities at zero external momentum. The coefficients of this ''zero-threshold'' expansion are calculated analytically for arbitrary masses. Numerical examples, using diagrams occurring in the Standard Model, illustrate the convergence of the expansion below the first non-zero threshold.

引用

页码：536 / 560

页数：25

共 63 条

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