Electroweak Precision Observables: Two-Loop Yukawa Corrections of Supersymmetric Particles
Abstract
The dominant electroweak two-loop corrections to the precision observables MW and sweff are calculated in the MSSM. They are obtained by evaluating the two-loop Yukawa contributions of O(alphat2), O(alphat alphab), O(alphab2) to the quantity Delta rho. The result, involving the contributions from Standard Model fermions, sfermions, Higgs bosons and higgsinos, is derived in the gauge-less limit for arbitrary values of the lightest CP-even Higgs boson mass. A thorough discussion of the parameter relations enforced by supersymmetry is given, and two different renormalization schemes are applied. Compared to the previously known result for the quark-loop contribution we find a shift of up to +8 MeV in MW and -4 * 10-5 in sweff. Detailed numerical estimates of the remaining uncertainties of MW and sweff from unknown higher-order contributions are obtained for different values of the supersymmetric mass scale.
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