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Title Resonant contributions to polarized proton structure functions
Authors A. Hiller Blin, Victor Mokeev, W. Melnitchouk
JLAB number JLAB-THY-23-3739
LANL number arXiv:2212.11952
Other number DOE/OR/23177-5674
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 C
Volume 107
Page(s) 035202
Publication Abstract: Nucleon resonance contributions to the polarized proton $g_1$ and $g_2$ structure functions are computed from resonance electroexcitation amplitudes extracted from CLAS exclusive meson electroproduction data. Including resonances in the mass range up to 1.75~GeV, and taking into account the interference between excited states, we compare the resonant contributions with the polarized proton structure function and polarization asymmetry data from Jefferson Lab 6~GeV measurements. All resonance-like structure observed in the polarized structure functions and asymmetries can be attributed to the resonant contributions, suggesting their essential role in the behavior of $g_1$ and $g_2$ at large parton momentum fraction $x$ in the resonant region over the entire range $Q^2 < 7.5$~GeV$^2$ covered by the measurements. Comparing the resonance contributions with the $g_1$ and $g_1$ structure functions computed from parton distribution functions extrapolated from the deep-inelastic region, we also quantify the degree to which quark-hadron duality holds for $g_1$ and $g_2$ and their moments.
Experiment Numbers: other
Document: pdf
Accepted Manuscript: PhysRevC.107.035202.pdf
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