The effective electroweak mixing angle ${\sin }^2{\theta }_{eff}$ with two-loop bosonic contributions

Abstract

We present the results for the full electroweak two-loop bosonic contributions to the effective leptonic mixing angle of the $Z$ boson, ${\sin }^2{\theta }_{\mathrm{eff}}$, 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.

Comments: 14 pages, 3 figures, 4 tables