One of the main objectives of Jefferson Lab is to understand the structure of the nucleon in terms of the quark-gluon degrees of freedom. Measurements of inclusive processes, such as deep inelastic scattering (DIS), have shown that in the limit of large Q^2, at fixed values of xB, such processes can be viewed as scattering from individual partons within the hadronic system. A similar factorization of scales, allowing perturbative QCD concepts to be used in the description of hadrons, may be expected in hard exclusive processes. The Q^2 dependence of the separated p(e,e^'&+circ;)n cross sections provides one of the best ways to test the factorization of long-distance from short-distance physics, and at which values of Q^2 it applies. Such tests will lay the foundation for a reliable interpretation of the results from the GPD program at Jefferson Lab, and for GPD studies with a future electron-ion collider. In this talk I will present a QCD scaling study using published ^1H(e,e^'&+circ;)n cross sections and new results from the πCT experiment (E01-107), which was carried out in Hall C at Jefferson Lab.
APS Division of Nuclear Physics Meeting Abstracts
- Pub Date:
- October 2007