[Deeppwg] [EXTERNAL] Neutron DVCS abstract for DNP 2020

[Marco Contalbrigo]

Dear all,
attached is the abstract Kitty intends to submit
to the DNP Fall Meeting. The abstract is also available
for DPWG approval at the DPANA web page:

https://clas12-docdb.jlab.org/cgi-bin/DocDB/private/DisplayMeeting?conferenceid=9

As the APS submission portal indicates July 1st as
submission deadline, I too the liberty to circulate
this late abstract. Please provide your comments and
suggestions to the authors and me as soon as possible,
in any case by Monday 29.

Thank you, Marco.
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Measuring Deeply Virtual Compton Scattering on the Neutron with CLAS12 at
Jefferson Lab

Abstract:
A key step towards understanding nucleon structure in terms of generalized
parton distributions (GPDs) is the measurement of deeply virtual Compton
scattering on the neutron (nDVCS). This talk will report on a recently concluded
experiment at Jefferson Lab, utilizing the upgraded 11 GeV CEBAF polarized
electron beam, the CLAS12 detector, and a liquid deuterium target. Preparation
of the raw data for analysis is currently ongoing. Preliminary beam-spin 
asymmetries for nDVCS ($ed\to e'n\gamma(p)$), extracted from approximately half of 
the total dataset, and a summary of detector performance and data quality will 
be presented. This beam-spin asymmetry measurement, when taken with complementary
pDVCS measurements, gives us access to the flavor separation of relevant quark
GPDs, only accessible in linear combinations within proton and neutron GPDs.
In particular, the measurement of GPD E via nDVCS can be used to gather 
information on the quark total angular momentum and a more complete 
picture of the nucleon structure.