Complete O(Nfα2) weak contributions to the muon lifetime

被引：8

作者：

Malde, P ^{[1
]}

Stuart, RG

机构：

[1] Univ Michigan, Randall Lab Phys, Ann Arbor, MI 48109 USA

[2] Max Planck Inst Phys, D-80805 Munich, Germany

来源：

NUCLEAR PHYSICS B | 1999年 / 552卷 / 1-2期

关键词：

D O I：

10.1016/S0550-3213(99)00245-X

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：

The complete O(N(f)alpha(2)) weak contributions to the muon lifetime, denoted as Delta r((2)), are calculated in the <(MS)over bar> renormalization scheme. These come from 2-loop Feynman diagrams containing a loop formed by complete generations of massless fermions. They form an independent, gauge-invariant set of corrections that, because of the large number of light fermions in the Standard Model, is expected to make a significant contribution. In the <(MS)over bar> renormalization scheme with mu' = (pi e(gamma)) (1/2) mu = M-z, and for a Higgs mass, M-H, in the range 100-1000 GeV the contribution varies from -0.55 x 10(-4) to -1.54 x 10(-4) for each massless generation of fermions. (C) 1999 Published by Elsevier Science B.V. All rights reserved.

引用

页码：41 / 66

页数：26

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