%0 Journal Article
%T Precision Measurements of the Proton Elastic Form Factor Ratio
%A D. W. Higinbotham
%J Physics
%D 2010
%I arXiv
%R 10.1063/1.3483410
%X New high precision polarization measurements of the proton elastic form factor ratio in the Q^2 range from 0.3 to 0.7 [GeV/c]^2 have been made. These elastic H(e,e'p) measurements were done in Jefferson Lab's Hall A using 80% longitudinally polarized electrons and recoil polarimetry. For Q^2 greater than 1 [GeV/c]^2, previous polarization data indicated a strong deviation of the form factor ratio from unity which sparked renewed theoretical and experimental interest in how two-photon diagrams have been taken into account. The new high precision data indicate that the deviation from unity, while small, persists even at Q^2 less than 1 [GeV/c]^2.
%U http://arxiv.org/abs/1001.3341v2