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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)

Compiled for Physical Review Letters
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 $\Delta \bar{d}/\bar{d}$.
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