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.
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收藏
页码：536 / 560
页数：25
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