Two-loop electroweak fermionic corrections to sin2 θeffb(b)over-bar

被引：29
作者：
Awramik, M. [1 ,2 ]
Czakon, M. [3 ,4 ]
Freitas, A. [5 ]
Kniehl, B. A. [1 ]
机构：
[1] Univ Hamburg, Inst Theoret Phys 2, D-22761 Hamburg, Germany
[2] Inst Nucl Phys PAN, PL-31342 Krakow, Poland
[3] Univ Wurzburg, Inst Theoret Phys & Astrophys, D-97074 Wurzburg, Germany
[4] NCSR Demokritos, Inst Nucl Phys, GR-15310 Athens, Greece
[5] Univ Pittsburgh, Dept Phys & Astron, Pittsburgh, PA 15260 USA
来源：
NUCLEAR PHYSICS B | 2009年 / 813卷 / 1-2期
关键词：
Electroweak radiative corrections; Effective weak-mixing angle; Bernstein-Tkachov algorithm; WEAK MIXING ANGLE; VACUUM-POLARIZATION FUNCTIONS; QUANTUM-FIELD THEORY; SEMIANALYTICAL PROGRAM; RADIATIVE-CORRECTIONS; NUMERICAL EVALUATION; DISPERSION-RELATIONS; BOSONIC CORRECTIONS; FEYNMAN-INTEGRALS; PAIR PRODUCTION;
D O I：
10.1016/j.nuclphysb.2008.12.031
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 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.
引用
收藏
页码：174 / 187
页数：14
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