DVCS with longitudinally polarized target using CLAS at 6 GeV
Deeply Virtual Compton Scattering (DVCS) is one of the simplest processes that can be described in terms of Generalized Parton Distributions (GPDs). The target single-spin asymmetry (target SSA) in the reaction $$e\vec{p} \rightarrow e p \gamma$$ is directly proportional to the imaginary part of the DVCS amplitude, and gives access to a combination of GPDs namely $$\tilde H$$, $$H$$, and $$E$$. This asymmetry will be measured in a dedicated experiment at Jefferson Lab using the CEBAF 6-GeV polarized electron beam, a polarized solid-state $${}^{14}NH_3$$ target, and the CEBAF Large Acceptance Spectrometer (CLAS) together with the Inner Calorimeter (IC). The expected asymmetry from leading-order calculations is in the range of 20\% to 40\%, depending on the kinematics and on the GPD model used. The DVCS amplitude will be mapped out in the $Q^2$ region from 1 to 4 GeV$${}^2$$, $$x_B$$ from 0.15 to 0.55 and $-t$ from 0.1 to 2 GeV$${}^2$$ providing new constraints on the GPDs.
- Research Organization:
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- AC05-06OR23177
- OSTI ID:
- 1059422
- Report Number(s):
- JLAB-PHY-08-839; DOE/OR/23177-2440
- Journal Information:
- AIP Conf. Proc., Vol. 1149; Conference: SPIN 2008, 6-11 Oct 2008. Charlottesville, Virginia
- Country of Publication:
- United States
- Language:
- English
Similar Records
Target and double spin asymmetries of deeply virtual π 0 production with a longitudinally polarized proton target and CLAS
Beam Spin Asymmetries in DVCS with CLAS at 4.8 GeV