Precision Observables in the MSSM: Leading Electroweak Two-loop Corrections
S. Heinemeyer, G. Weiglein
Abstract
The leading electroweak MSSM two-loop corrections to the ρ-parameter are calculated. They are obtained by evaluating the two-loop self-energies of the Z and the W boson at O(Gf2 mt4) in the limit of heavy scalar quarks. A very compact expression is derived, depending on the ratio of the CP-odd Higgs boson mass, MA, and the top quark mass, mt. Expressions for the limiting cases MA >> mt and MA << mt are also given. The decoupling of the non-SM contribution in the limit MA -> oo is verified at the two-loop level. The numerical effect of the leading electroweak MSSM two-loop corrections is analyzed in comparison with the leading corrections of O(Gf2 mt4) in the SM and with the O(alpha alphas) corrections in the MSSM.
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