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Volume 346 - 23rd International Spin Physics Symposium (SPIN2018) - Parallel Session: 3D Structure of the Nucleon: GPDs and Form Factors (C. Lorce and S. Niccolai)
Deeply Virtual Compton Scattering off the Neutron with Spectator Proton Tagging in Hall A at Jefferson Laboratory
E. Fuchey
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Pre-published on: 2019 August 19
Published on: 2019 August 23
Generalized Parton Distributions (GPDs) provide a three-dimensional parametrization of the
quarks and gluons inside the nucleon, which provides a particularly valuable insight on the orbital
angular momentum of quarks and gluons. GPDs may be determined with measurement of exclu-
sive electroproduction processes such as Deeply Virtual Compton Scattering (DVCS) $eN \rightarrow eN \gamma$.
In particular, measurement on the neutron, combined with measurements on the proton, provides
a particularly interesting combination of observables which give a strong constraint on the orbital
angular momentum of partons. We propose to measure the Deeply Virtual Compton Scattering
(DVCS) on the neutron, using a deuterium target, and with spectator proton tagging. Such a
technique allows to unambiguously identify the neutron-DVCS events from proton and coher-
ent deuterium DVCS events, and to apply corrections to the nuclear effect of the neutron in the
deuteron. We describe here this experiment, its assets, and projections will be discussed.
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