ep - p h / 06 08 09 9 v 2 2 1 N ov 2 00 6 DESY 06 - 108 ZH – TH 17 / 06 Electroweak two - loop corrections to the effective weak mixing angle

Abstract

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… (More)

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