Speaker
Jacob McMurtry
(U. of Virginia)
Description
This research project is centered around Jefferson Lab (JLab) experiment E12-07-109 (GEp-V) to measure the proton electromagnetic form factor ratio G_E^P/G_M^P. GEp-V will use the recoil polarization technique in which a longitudinally polarized electron beam is scattered off a fixed unpolarized proton target. The resulting transfer of polarization to the recoiling proton is measured and the ratio of the longitudinal and perpendicular components is directly proportional to the form factor ratio. A large spectrometer will measure this polarization ratio. Crucial to this measurement are the tracking detectors known as GEMs which measure particle trajectories to high precision.
