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We present a next-to-leading order QCD calculation of the cross section andlongitudinal spin asymmetry in single-inclusive charged-lepton production, pp-> l X, at RHIC, where the lepton is produced in the decay of an electroweakgauge boson. Our calculation is presented in terms of a multi-purposeMonte-Carlo integration program that may be readily used to includeexperimental spin asymmetry data in a global analysis of helicity partondensities. We perform a toy global analysis, studying the impact of anticipatedRHIC data on our knowledge about the polarized anti-quark distributions.

Helicity Parton Distributions from Spin Asymmetries in W-Boson Production at RHIC