Higgs-mass dependence of the effective electroweak mixing angle sin2θeff at the two-loop level

Abstract The result for the Higgs-dependent electroweak two-loop bosonic contributions to the effective leptonic mixing angle of the Z -boson in the Standard Model is presented. Together with the previously calculated fermionic contributions it yields the complete dependence of sin 2 θ eff on the Higgs-boson mass M H . Compared to the fermionic contributions, the bosonic contributions are found to be smaller and have the opposite sign, compensating part of the fermionic contributions.