Electroweak two-loop corrections to the effective weak mixing angle

Details Electroweak two-loop corrections to the effective weak mixing angle Electroweak two-loop corrections to the effective weak mixing angle

2006-08-09

arxiv.org/abs/hep-ph/0608099v2

JHEP0611:048,2006

Physics

High Energy Physics

High Energy Physics - Phenomenology

28 pages; added numerical formulae for form factors Delta-r and Delta-kappa, and few minor corrections, version to appear in J

Scientific paper

10.1088/1126-6708/2006/11/048

Recently exact results for the complete electroweak two-loop contributions to the effective weak mixing angle were published. This paper illustrates the techniques used for this computation, in particular the methods for evaluating the loop diagrams and the proper definition of Z-pole observables at next-to-next-to-leading order. Numerical results are presented in terms of simple parametrization formulae and compared in detail with a previous result of an expansion up to next-to-leading order in the top-quark mass. Finally, an estimate of the remaining theoretical uncertainties from unknown higher-order corrections is given.

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