2 research outputs found
Precise Prediction for M_W in the MSSM
We present the currently most accurate evaluation of the W boson mass, M_W,
in the Minimal Supersymmetric Standard Model (MSSM). The full complex phase
dependence at the one-loop level, all available MSSM two-loop corrections as
well as the full Standard Model result have been included. We analyse the
impact of the different sectors of the MSSM at the one-loop level with a
particular emphasis on the effect of the complex phases. We discuss the
prediction for M_W based on all known higher-order contributions in
representative MSSM scenarios. Furthermore we obtain an estimate of the
remaining theoretical uncertainty from unknown higher-order corrections.Comment: 38 pages, 25 figures. Minor corrections, additional reference
Electroweak Two-loop Corrections to the Effective Weak Mixing Angle.
Recently exact results for the complete electroweak two-loop contributions to
the effective weak mixing angle were published. This paper illustrates the
techniques used for this computation, in particular the methods for evaluating
the loop diagrams and the proper definition of Z-pole observables at
next-to-next-to-leading order. Numerical results are presented in terms of
simple parametrization formulae and compared in detail with a previous result
of an expansion up to next-to-leading order in the top-quark mass. Finally, an
estimate of the remaining theoretical uncertainties from unknown higher-order
corrections is given.Comment: 28 pages; added numerical formulae for form factors Delta-r and
Delta-kappa, and few minor corrections, version to appear in JHE