Higgs-mass dependence of the effective electroweak mixing angle sin(2) theta(eff) at the two-loop level

摘要

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) theta(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. (c) 2005 Elsevier B.V. All rights reserved.