Abstract: Drell-Yan lepton pairs are produced in the process pp ! eþe þ X through an intermediate =Z boson. The lepton angular distributions are used to provide information on the electroweak-mixing parameter sin 2W via its observable effective-leptonic sin 2W, or sin 2lept eff . A new method to infer sin 2W or, equivalently, the W-boson mass MW in the on-shell scheme, is developed and tested using a previous CDF Run II measurement of angular distributions from electron pairs in a sample corresponding to 2:1 fb 1 of integrated luminosity from pp collisions at a center-of-momentum energy of 1.96 TeV. The value of sin 2lept eff is found to be 0:2328 0:0011. Within a specified context of the standard model, this results in sin 2W ¼ 0:2246 0:0011, which corresponds to a W-boson mass of 80:297 0:055 GeV=c2, in agreement with previous determinations in electron-position collisions and at the Tevatron collider

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