Dear everyone, <br><br>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).<br>
<br>I'll be very grateful for any comments,<br><br>Many thanks, <br><br>Daria <br><br>***** Abstract *****<br><br>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. <br>
<br>*******<br><br><br clear="all"><br>-- <br>~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~<br>Daria Sokhan <br>Institut de Physique Nucleaire<br>Bat 100 - M055<br>Orsay 91406 tel: +33 1 69 15 45 00<br>
France fax: +33 1 69 15 64 70<br>~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~<br>