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 $\Delta \bar{d}/\bar{d}$. |
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Group: | THEORY CENTER |
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