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

页码：174 / 187

页数：14

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