Consequences of Recent Electroweak Data and W - mass for the Top Quark and Higgs Masses 1

We critically reexamine the precision tests of the standard model by coupling the current world average value of MW with the recent LEP electroweak data with the aid of a modified ZFITTER program to include the dominant two-loop and QCD-EW mixed terms. The results show a clear evidence of nonvanishing electroweak radiative corrections. The recent CDF mt is a solution of the minimal χ-fits to the recent LEP data set and MW = 80.23(18) GeV but with a heavy Higgs scalar, i.e., mt = 179 GeV and mH = 300 GeV. We discuss how sensitive mt and mH are depending on the exact value of MW even within the present uncertainty, as well as on αs and α(MZ). We show how the future improvements on MW can discriminate different values of mt and mH from the electroweak data and provide a crucial and decisive test for the standard model. Presented at Beyond the Standard Model IV, Granlibakken, Lake Tahoe, CA (December 13 -19, 1994) 2 Supported in part by the USDOE contract DE-FG02-91ER40688-Task A Supported in part by the Basic Science Research Institute Program, Ministry of Education, Project No. BSRI-94-2418, and the Korea Science and Engineering Foundation through SNU CTP