The implications of precise new Z- and W-mass and weak-neutral-current data for the top-quark and Higgs-boson masses are analyzed. It is found that (a) ${\sin }^2$${\mathrm{\theta }}_{\mathrm{W}}$=0.226±0.005 for arbitrary $m_t$ and for all $M_H$<1 TeV; (b) $m_t$<210 GeV at 90% C.L.; (c) $m_t$>40 GeV at 90% C.L., even if the direct lower limit $m_t$>78 GeV does not apply; and (d) there is no constraint on the Higgs-boson mass.

• Received 12 September 1989

DOI:https://doi.org/10.1103/PhysRevLett.63.1920