期刊
NUCLEAR PHYSICS B
卷 813, 期 1-2, 页码 174-187出版社
ELSEVIER
DOI: 10.1016/j.nuclphysb.2008.12.031
关键词
Electroweak radiative corrections; Effective weak-mixing angle; Bernstein-Tkachov algorithm
资金
- German Research Foundation (DFG) [KN 365/3-1]
- Collaborative Research Centre [676]
- Alexander von Humboldt Foundation
- ToK Program ALGOTOOLS [MTKD-CD-2004-014319]
We present the first calculation of the two-loop electroweak fermionic correction to the flavour-dependent effective weak-mixing angle for bottom quarks, sin(2) theta(b (b) over bar)(eff). For the evaluation of the missing two-loop vertex diagrams, two methods are employed, one based on a semi-numerical Bernstein-Tkachov algorithm and the second on asymptotic expansions in the large top-quark mass. A third method based on dispersion relations is used for checking the basic loop integrals. We find that for small Higgs-boson mass values, M-H alpha 100 GeV, the correction is sizable, of order O(10(-4)). (C) 2009 Elsevier B.V. All rights reserved.
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