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Title How well do we know the gluon polarization in the proton?
Authors Y. Zhou,Nobuo Sato Gonzalez,Wolodymyr Melnitchouk
JLAB number JLAB-THY-22-3462
LANL number arXiv:2201.02075
Other number DOE/OR/23177-5397
Document Type(s) (Journal Article) 
Associated with EIC: Yes
Supported by Jefferson Lab LDRD Funding: No
Funding Source: Nuclear Physics (NP)

Compiled for Physical Review D
Volume 105
Page(s) 074022
Publication Abstract: We perform the first simultaneous global QCD analysis of spin-averaged and spin-dependent parton distribution functions (PDFs), including single jet production data from unpolarized and polarized hadron collisions. We critically assess the impact of SU(3) flavor symmetry and PDF positivity assumptions on the quark and gluon helicity PDFs, and find strong bias from these, particularly on the gluon polarization. The simultaneous analysis allows for the first time extraction of individual helicity aligned and antialigned PDFs with a consistent treatment of uncertainties.
Experiment Numbers: other
Document: pdf
Accepted Manuscript: PhysRevD.105.074022.pdf
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