Speaker
Description
A key step to improve our understanding of nucleon structure in terms of Generalized Parton
Distributions (GPDs) is the measurement of Deeply Virtual Compton Scattering on the neutron (nDVCS;
ed → e'nγ(p)). This process provides mainly, in the kinematic range covered at Jefferson Lab, an access
to the GPD E of the neutron, which is the least known and constrained GPD as of today. The
measurement of E, together with H, yields information on the quark total angular momentum – via the
Ji's sum rule – the missing ingredient to understand the nucleon spin composition. The GPD E is
accessed in nDVCS by measuring the Beam Spin Asymmetry (BSA). The measurement of the BSA of
nDVCS, combined with other nDVCS observables and from those obtained in pDVCS measurements,
will allow to perform the quark-flavor separation of the GPDs. This talk will report results for nDVCS
obtained at Jefferson Lab with a 10.5-GeV polarized electron beam, the Hall-B CLAS12 detector, and a
liquid deuterium target. The CLAS12 nDVCS beam-spin asymmetries provide unparalleled constraints
on the imaginary part of E, and, combined to proton-DVCS CLAS12 data, allow to extract its quark-
flavor dependence. An overview of the recent experiment on nDVCS carried out with CLAS12 and a
longitudinally polarized target will also be provided.
