ACCURATE DETERMINATION OF SIN 2-THETA-W(MZ)

A radiative correction rW linking directly the MS (modified minimal-subtraction scheme) parameter sin2 W(mZ) to G, and mW is introduced. Its dependence on mt and mH is very weak. Employing mW=80.110.31 GeV (obtained from the direct and R measurements of mWmZ in conjunction with mZ) and allowing the range 78mt200 GeV, 10 GeVmH1 TeV leads to sin2 W(mZ)=0.23270.00180.0007 (the first error arises from mW, the second reflects the mt,mH uncertainty), in very good agreement with the corresponding value sin2 W(mZ)=0.23270.00120.0021 obtained from mZ. Implications for the Z0 asymmetries and the possible use of the mW determination in extensions of the standard model involving Higgs triplets are outlined. © 1990 The American Physical Society.