# Longitudinal target-spin asymmetries for deeply virtual Compton scattering

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 $ep\to e'p'\gamma$ 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 $\phi$, for 166 four-dimensional bins. In the framework of Generalized Parton Distributions (GPDs), at leading twist the $t$ dependence of these asymmetries provides insight on 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 GPDs.
Type de document :
Article dans une revue
Physical Review Letters, American Physical Society, 2015, 114, pp.032001. 〈10.1103/PhysRevLett.114.032001〉

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Contributeur : Emmanuelle Vernay <>
Soumis le : lundi 27 octobre 2014 - 13:46:01
Dernière modification le : mardi 22 mai 2018 - 21:48:09

### Citation

E. Seder, A. Biselli, S. Pisano, S. Niccolai, G.D. Smith, et al.. Longitudinal target-spin asymmetries for deeply virtual Compton scattering. Physical Review Letters, American Physical Society, 2015, 114, pp.032001. 〈10.1103/PhysRevLett.114.032001〉. 〈in2p3-01077848〉

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