Two-loop heavy top effects on precision observables and the Higgs mass
Abstract
The electroweak corrections induced by a heavy top on the main precision observables are now available up to O(g4 mt2/mw2). The new results significantly reduce the theoretical uncertainty and have a sizable impact on the determination of sin2thetaeff. We give precise predictions for mw and the effective sine in different renormalization schemes, estimate their accuracy, and discuss the implications for the indirect determination of MH. From the present data for sin2thetaeff we obtain MH = 127 +143 -71 GeV (or MH < 430 GeV at 95% C.L.).
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