Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2005-08-11
JHEP 0512 (2005) 027
Physics
High Energy Physics
High Energy Physics - Phenomenology
35 pages, 16 figures
Scientific paper
10.1088/1126-6708/2005/12/027
The dominant electroweak two-loop corrections to the precision observables M_W and s_w^eff are calculated in the MSSM. They are obtained by evaluating the two-loop Yukawa contributions of O(alpha_t^2), O(alpha_t alpha_b), O(alpha_b^2) 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 M_W and -4 * 10^-5 in s_w^eff. Detailed numerical estimates of the remaining uncertainties of M_W and s_w^eff from unknown higher-order contributions are obtained for different values of the supersymmetric mass scale.
Haestier J.
Heinemeyer Sven
Stöckinger Dominik
Weiglein Georg
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