AI Article Synopsis
- A study was conducted at Jefferson Lab using a 6 GeV electron beam to measure how photons are produced by protons in a deeply inelastic scattering context.
- The researchers analyzed target-spin asymmetries from specific electron-proton-photon events across various kinematic conditions, providing data in 166 four-dimensional bins.
- The findings help improve our understanding of the proton's axial charge distribution and offer critical constraints for current generalized parton distribution models.
Article Abstract
A measurement of the electroproduction of photons off protons in the deeply inelastic regime was performed at Jefferson Lab using a nearly 6 GeV electron beam, a longitudinally polarized proton target, and the CEBAF Large Acceptance Spectrometer. Target-spin asymmetries for ep→e^{'}p^{'}γ events, which arise from the interference of the deeply virtual Compton scattering and the Bethe-Heitler processes, were extracted over the widest kinematics in Q^{2}, x_{B}, t, and ϕ, for 166 four-dimensional bins. In the framework of generalized parton distributions, at leading twist the t dependence of these asymmetries provides insight into the spatial distribution of the axial charge of the proton, which appears to be concentrated in its center. These results also bring important and necessary constraints for the existing parametrizations of chiral-even generalized parton distributions.
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| http://dx.doi.org/10.1103/PhysRevLett.114.032001 | DOI Listing |
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Article Synopsis
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- The findings help improve our understanding of the proton's axial charge distribution and offer critical constraints for current generalized parton distribution models.
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