Deeply Virtual Compton Scattering (DVCS) Run (E12-06-114) in Hall A of Thomas Jefferson National Accelerator Facility (TJNAF)
ORAL
Abstract
Generalized Parton Distributions (GPDs) provide a information about transverse position and longitudinal momentum distribution of partons in the nucleon along with the correlation between transverse position and longitudinal momentum of partons. GPDs also provide access to the contribution of orbital momentum of partons to nucleon total spin. The DVCS is one of the favorite reaction to measure the GPDs because it is simplest process that can be described in terms of GPDs. DVCS refers to scattering of virtual photon off the nucleon ($\gamma^* N \rightarrow \gamma N$). The DVCS experiment (E12-06-114) in Hall A will be running again in Fall 2016, to complete proposed DVCS kinematics. We use the polarized electron beam from CEBAF with energy ranging from 8 GeV to 11 GeV and measure high statistics polarized and unpolarized cross section of H(e,e'$\gamma$)p and map it to extract GPDs of proton. The wide range of $Q^2$ scan (2.7$\leq Q^2\geq$9 $GeV^2$) for $x_B$ ranging from 0.3 to 0.6 are performed. The $Q^2$ dependence of the cross section allows one to quantify the contribution of higher twist terms. In this talk the status of experiment will be presented.
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Authors
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Bishnu Karki
Ohio Univ