Electroweak effects in the B0-(B)over-bar0 mixing

被引：22
|
作者：
Gambino, P [1 ]
Kwiatkowski, A [1 ]
Pott, N [1 ]
机构：
[1] Tech Univ Munich, Dept Phys, D-85748 Garching, Germany
来源：
NUCLEAR PHYSICS B | 1999年 / 544卷 / 03期
关键词：
D O I：
10.1016/S0550-3213(98)00860-8
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 compute analytically the complete electroweak two-loop corrections to the B-0-(B) over bar(0) mixing. These corrections fix the normalization of the electroweak coupling employed in the extraction of \V-td\ and reduce the theoretical uncertainty due to higher order electroweak effects from several percent to a few parts in a thousand. If the LO result is expressed in terms of G(mu) or of the <(MS)over bar> coupling (g) over cap(M-Z), the two-loop corrections are O(1%), the exact value depending on the mass of the Higgs boson. We discuss in detail the renormalization procedure and the scheme and scale dependence, and provide practical formulas for the numerical implementation of our results. We also consider the heavy top mass expansion and show that in the case at hand it converges very slowly. (C) 1999 Elsevier Science B.V.
引用
收藏
页码：532 / 556
页数：25
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