PoS - Proceedings of Science
Volume 310 - XVII International Conference on Hadron Spectroscopy and Structure (Hadron2017) - Session 6: QCD and hadron structure
Deeply Virtual Compton Scattering at 11GeV in Jefferson Lab Hall A
F. Georges*  on behalf of the Jefferson Lab Hall A Collaboration
Full text: pdf
Pre-published on: February 16, 2018
Published on: March 20, 2018
Abstract
Introduced in the mid 90's, Generalized Parton Distributions (GPDs) are now a key element in the study of the nucleon internal structure. Indeed, GPDs encapsulate both spatial and momentum distributions of partons inside a nucleon, and through the Ji sum rule, they also allow to derive the total orbital angular momentum of quarks.
GPDs are experimentally accessible through Deeply Virtual Compton Scattering (DVCS) and its interference with the Bethe-Heitler process at high momentum transfer Q$^2$. A worldwide experimental program was started in the early 2000's to extract these GPDs. The subject of this document, a DVCS ep $\rightarrow$ ep$\gamma$ experiment performed at Jefferson Laboratory, Hall A (Virginia, USA) between 2014 and 2016, is encompassed in this program.
The aim of this experiment is to extract the DVCS helicity-dependent cross sections as a function of the momentum transfer Q$^2$, for fixed values of the Bjorken variable x$_B$, on a proton target. The recent upgrade of the accelerator facility to 12 GeV allows to cover a larger lever arm in Q$^2$ than for previous measurements, while the polarized electron beam will allow the separation of the contributions from the real and imaginary parts of the DVCS amplitude to the total cross section.
This document will present an overview of the ongoing data analysis for this experiment.
DOI: https://doi.org/10.22323/1.310.0170
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