[Deeppwg] Abstract for SPIN2012

[Daria Sokhan]

Dear everyone,

I would like to submit an abstract for SPIN2012, to present my work on
neutron DVCS: preliminary extraction from eg1-dvcs and the central neutron
detector for CLAS12. Please find the abstract below -- apologies for the
rather short notice as the deadline is 30th July (Monday).

I'll be very grateful for any comments,

Many thanks,

Daria

***** Abstract *****

Generalised Parton Distributions (GPDs) offer an insight into the
three-dimensional structure of the nucleon and its internal dynamics,
relating the longitudinal momentum of quarks to their transverse position.
A very effective means of accessing GPDs is via measurements of
polarisation-asymmetries in Deeply Virtual Compton Scattering (DVCS), in
which a high energy electron scatters from a single quark in the nucleon
and a photon is produced as a result. Measurements on both the neutron and
proton are required for quark-flavour separation of GPDs, yet while an
active experimental programme is underway on proton-DVCS, the neutron
remains almost unprobed. We present a very preliminary extraction of
beam-spin and (previously unmeasured) target-spin asymmetry in neutron-DVCS
from an experiment using the Jefferson Laboratory 6 GeV electron beam, a
deuterated ammonia target and the large-angle spectrometer CLAS.
Additionally, the current upgrade of the Jefferson Lab accelerator to
operate at 12 GeV and the complementary construction of CLAS12 detectors
open a vast new kinematic region to experiment, in which the neutron-DVCS
beam-spin asymmetry is extremely sensitive to the total angular momentum of
the quarks. Its measurement therefore has potential to shed very important
light on the as-yet unknown composition of nucleon spin, and a dedicated
experiment, involving the construction of a neutron detector for CLAS12, is
planned at 11 GeV.

*******



-- 
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Daria Sokhan
Institut de Physique Nucleaire
Bat 100 - M055
Orsay 91406                              tel: +33 1 69 15 45 00
France                                      fax: +33 1 69 15 64 70
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