[Deeppwg] [EXTERNAL] nDVCS abstract for PANIC2021

[Marco Contalbrigo]

Dear all,
below is the abstract about nDVCS results Pierre intends
to submit to the PANIC Conference.

Comments and suggestions are welcome till Saturday
19th of June. I apologize for the late notice.

Best regards, Marco.


Deeply Virtual Compton Scattering off the Neutron with CLAS12 at Jefferson Lab

A key step towards a better understanding of nucleon structure in terms of generalized parton distributions (GPDs)
is the measurement of deeply virtual Compton scattering off the neutron (nDVCS; $ed\to e'n\gamma(p)$). This process
emphasizes mainly, in the kinematic range covered at Jefferson Lab, the access to the GPD E of the neutron which is
the least constraind GPD up till now. The measurement of E, together with H, provides information on the quark total
angular momentum via the Ji's sum rule - and conveys a more complete picture of nucleon structure. The GPD E is
accessed in nDVCS through the Beam Spin Asymmetry (BSA). The measurement of the BSA of nDVCS, combined with
observables from pDVCS measurements, will allow to perform the flavor separation of relevant quark GPDs via linear
combinations of proton and neutron GPDs. This talk will report on the experiment recently carried out at Jefferson
Lab with the upgraded ~11 GeV CEBAF polarized electron beam, the Hall-B CLAS12 detector, and a liquid deuterium
target. Details on the data analysis along with preliminary beam-spin asymmetries for nDVCS will be presented.