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Improved predictions for the Z-boson decay width and the hadronic Z-peakcross-section within the Standard Model are presented, based on a completecalculation of electroweak two-loop corrections with closed fermion loops.Compared to previous partial results, the predictions for the Z width andhadronic cross-section shift by about 0.6 MeV and 0.004 nb, respectively.Compact parametrization formulae are provided, which approximate the fullresults to better than 4 ppm.

Two-loop fermionic electroweak corrections to the Z-boson width and production rate