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 ep⃗→epγ is directly proportional to the imaginary part of the DVCS amplitude, and gives access to a combination of GPDs namely H̃, 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 14NH3 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 Q2 region from 1 to 4 GeV2, xB from 0.15 to 0.55 and −t from 0.1 to 2 GeV2 providing new constraints on the GPDs.
AIP Conference Proceedings
Biselli, Angela and CLAS Collaboration, "DVCS with longitudinally polarized target using CLAS at 6 GeV" (2009). Physics Faculty Publications. 141.
Biselli, A., & CLAS collaboration. (2009, August). DVCS with longitudinally polarized target using CLAS at 6 GeV. In AIP Conference Proceedings (Vol. 1149, No. 1, pp. 611-614). AIP. https://doi.org/10.1063/1.3215721