Two-loop heavy top effects on precision observables and the Higgs mass

1997/03/07 by Paolo Gambino, Gambino, Paolo
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #hep-ph

paper · pdf · doi:10.48550/arxiv.hep-ph/9703264

11 pages, plain LaTeX. Talk given at the Workshop on "The Higgs puzzle - What can we learn from LEP II, LHC, NLC, and FMC?", Ringberg Castle, Germany, December 1996; to appear in the Proceedings, ed. B. Kniehl

arxiv created 1997/03/07 · arxiv updated 2009/11/30

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 sin²theta_eff. 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 M_H. From the present data for sin²theta_eff we obtain M_H = 127 +143 -71 GeV (or M_H < 430 GeV at 95% C.L.).

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