The effective electroweak mixing angle sin(2) theta(eff) with two-loop bosonic contributions

We present the results for the full electroweak two-loop bosonic contributions to the effective leptonic mixing angle of the Z boson, sin(2) theta(eff), in the Standard Model. A method applied to extract collinear divergences from two-loop vertex-functions is described. Comparisons of our results with those from a recent previous calculation show complete agreement. (c) 2007 Elsevier B.V. All rights reserved.