Speaker
Longwu Ou
(MIT)
Description
The electromagnetic form factors (FF) are of fundamental importance in the
investigation of nucleon structure and can be measured in high energy electron
scattering experiments and interpreted in the framework of the one-photon exchange
approximation. Current data on the proton form factors have significant statistical
and systematic uncertainties at large $Q^2$, which limits the precision of the
extracted physics information.
The GMp experiment in Hall A at Jefferson Lab performed measurements of elastic $ep$
scattering cross sections to a statistical precision of better than 2\% over a $Q^2$
range of 7-16 (GeV/c)$^2$ . These measurements are useful inputs for many nuclear
experiments at similar kinematics and represent a great complement to the world's
cross section data set. Taken at relatively large scattering angles and hence with
suppressed contributions from the electric form factor, these data will provide
important information on the proton magnetic form factor at high $Q^2$. In this
talk, the instrumentation and techniques used in the experiment will be described,
and the current status of the analysis will be presented.
Primary author
Longwu Ou
(MIT)
