Deeply virtual Compton scattering on the neutron with positron beam

Abstract

Measuring DVCS on a neutron target is a necessary step to deepen our understanding of the structure of the nucleon in terms of Generalized Parton Distributions (GPDs). The combination of neutron and proton targets allows to perform a flavor decomposition of the GPDs. Moreover, neutron-DVCS plays a complementary role to DVCS on a transversely polarized proton target in the determination of the GPD $E$, the least known and constrained GPD that enters Ji's angular momentum sum rule. A measurement of the beam-charge asymmetry (BCA) in the $e^{\pm }d\to e^{\pm }n{\hat{I}}^3(p)$ reaction can significantly impact the experimental determination of the real parts of the $E$ and, to a lesser extent, $\tilde{H}$ GPDs.

arXiv admin note: substantial text overlap with arXiv:2007.15081, arXiv:1906.09419