Measurement of G E p / G M p in e → p → e p → to Q 2 = 5.6 GeV 2

The ratio of the electric and magnetic form factors of the proton ${G}_{{E}_{p}}{/G}_{{M}_{p}}$, which is an image of its charge and magnetization distributions, was measured at the Thomas Jefferson National Accelerator Facility (JLab) using the recoil polarization technique. The ratio of the form factors is directly proportional to the ratio of the transverse to longitudinal components of the polarization of the recoil proton in the elastic $\stackrel{\ensuremath{\rightarrow}}{e}p\ensuremath{\rightarrow}e\stackrel{\ensuremath{\rightarrow}}{p}$ reaction. The new data presented span the range $3.5<{Q}^{2}<5.6{\mathrm{GeV}}^{2}$ and are well described by a linear ${Q}^{2}$ fit. Also, the ratio…

• NS
  National Science Foundation
• UD
  U.S. Department of Energy

  Awards: DE-AC05-84ER40150, DE-AC05
• CN
  Centre National de la Recherche Scientifique

  Award: CNRS-IN2P3
• IN
  Istituto Nazionale di Fisica Nucleare
• NS
  Natural Sciences and Engineering Research Council of Canada
• IN
  Institut National de Physique Nucléaire et de Physique des Particules
• TJ
  Thomas Jefferson National Accelerator Facility

  Award: DE-AC05-84ER40150