Abstract: At the Fermilab Tevatron proton-antiproton (p¯p) collider, Drell-Yan lepton pairs are produced in the process p¯p?e+e-+X through an intermediate ?*/Z boson. The forward-backward asymmetry in the polar-angle distribution of the e- as a function of the e+e--pair mass is used to obtain sin2?lepteff, the effective leptonic determination of the electroweak-mixing parameter sin2?W. The measurement sample, recorded by the Collider Detector at Fermilab (CDF), corresponds to 9.4??fb-1 of integrated luminosity from p¯p collisions at a center-of-momentum energy of 1.96 TeV, and is the full CDF Run II data set. The value of sin2?lepteff is found to be 0.23248±0.00053. The combination with the previous CDF measurement based on µ+µ- pairs yields sin2?lepteff=0.23221±0.00046. This result, when interpreted within the specified context of the standard model assuming sin2?W=1-M2W/M2Z and that the W- and Z-boson masses are on-shell, yields sin2?W=0.22400±0.00045, or equivalently a W-boson mass of 80.328±0.024??GeV/c2.

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