# Publications

## Publication Information

 Title Polarized Antimatter in the Proton from Global QCD Analysis Authors Christopher Cocuzza,Wolodymyr Melnitchouk,Andreas Metz,Nobuo Sato Gonzalez JLAB number JLAB-THY-22-3562 LANL number arXiv:2202.03372 Other number DOE/OR/23177-5423 Document Type(s) (Journal Article) Associated with EIC: No Supported by Jefferson Lab LDRD Funding: No Funding Source: Nuclear Physics (NP) Journal Compiled for Physical Review Letters Refereed Publication Abstract: 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 $\Delta \bar{u} - \Delta \bar{d}$ 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 $\Delta \bar{u}/\bar{u}$ and $\Delta \bar{d}/\bar{d}$. Experiment Numbers: Group: THEORY CENTER Document: pdf DOI: Accepted Manuscript: Supporting Documents: Supporting Datasets: