Helium Compton Form Factor Measurements at CLAS
Abstract
The distribution of the parton content of nuclei, as encoded via the generalized parton distributions (GPDs), can be accessed via the deeply virtual Compton scattering (DVCS) process contributing to the cross section for leptoproduction of real photons. Similarly to the scattering of light by a material, DVCS provides information about the dynamics and the spatial structure of hadrons. The sensitivity of this process to the lepton beam polarization allows to single-out the DVCS amplitude in terms of Compton form factors that contain GPDs information. The beam spin asymmetry of the $^4$He($$\vec {\mathrm e}$$,e$$' \gamma ^4$$He) process was measured in the experimental Hall B of the Jefferson Laboratory to extract the real and imaginary parts of the twist-2 Compton form factor of the $^4$He nucleus. The experimental results reported here demonstrate the relevance of this method for such a goal, and suggest the dominance of the Bethe-Heitler amplitude to the unpolarized process in the kinematic range explored by the experiment.
- Authors:
-
- Laboratoire de Physique Subatomique et Cosmologie
- Publication Date:
- Research Org.:
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1110318
- Report Number(s):
- JLAB-PHY-13-1737; DOE/OR/23177-2591
- DOE Contract Number:
- AC05-06OR23177
- Resource Type:
- Conference
- Journal Name:
- Proceedings of Science
- Additional Journal Information:
- Journal Volume: DIS2013; Conference: DIS2013, 22-26 April 2013, Marseille, France
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 73 NUCLEAR PHYSICS AND RADIATION PHYSICS
Citation Formats
Voutier, Eric J.-M. Helium Compton Form Factor Measurements at CLAS. United States: N. p., 2013.
Web.
Voutier, Eric J.-M. Helium Compton Form Factor Measurements at CLAS. United States.
Voutier, Eric J.-M. 2013.
"Helium Compton Form Factor Measurements at CLAS". United States. https://www.osti.gov/servlets/purl/1110318.
@article{osti_1110318,
title = {Helium Compton Form Factor Measurements at CLAS},
author = {Voutier, Eric J.-M.},
abstractNote = {The distribution of the parton content of nuclei, as encoded via the generalized parton distributions (GPDs), can be accessed via the deeply virtual Compton scattering (DVCS) process contributing to the cross section for leptoproduction of real photons. Similarly to the scattering of light by a material, DVCS provides information about the dynamics and the spatial structure of hadrons. The sensitivity of this process to the lepton beam polarization allows to single-out the DVCS amplitude in terms of Compton form factors that contain GPDs information. The beam spin asymmetry of the $^4$He($\vec {\mathrm e}$,e$' \gamma ^4$He) process was measured in the experimental Hall B of the Jefferson Laboratory to extract the real and imaginary parts of the twist-2 Compton form factor of the $^4$He nucleus. The experimental results reported here demonstrate the relevance of this method for such a goal, and suggest the dominance of the Bethe-Heitler amplitude to the unpolarized process in the kinematic range explored by the experiment.},
doi = {},
url = {https://www.osti.gov/biblio/1110318},
journal = {Proceedings of Science},
number = ,
volume = DIS2013,
place = {United States},
year = {Mon Jul 01 00:00:00 EDT 2013},
month = {Mon Jul 01 00:00:00 EDT 2013}
}