Abstract
In this paper we made a comprehensive analysis of some latest experimental data—the Z boson decay widths, the mass ratio MW/MZ and effective vector coupling constant gv, within the framework of standard model. We considered the , order QCD corrections in the calculation of Γh and ΓZ. The analysis shows that the mass ratio (Mt/MZ)2 is rather sensitive to the change of the strong coupling constant αs(MZ), and the smaller value αs(MZ) ≤ 0.128 is preferred. The upper bounds on top quark mass Mt are obtained from different analyses. The final averaged result is Mt = 102 ± 37 GeV, or Mt < 186 GeV at 95% C.L. for Higgs boson mass MH in the range of 50 ~ 1000 GeV.
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