We present a global QCD analysis of spin-dependent parton distribution functions (PDFs) that includes the latest polarized W -lepton production data from the STAR collaboration at RHIC. These data allow the first data-driven extraction of a nonzero polarized light quark sea asymmetry ∆ū−∆ d within a global QCD framework with minimal theoretical assumptions. Within our simultaneous extraction of polarized PDFs, unpolarized PDFs, and pion and kaon fragmentation functions, we also extract a self-consistent set of antiquark polarization ratios ∆ū/ū and ∆ d/ d.
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