Measurements of the elastic electromagnetic form factor ratio μ_pG_(Ep)/G_(Mp) via polarization transfer

Creators: Gayou, O.; Gao, J.; Jones, C.; Jefferson Lab Hall A Collaboration

Abstract

We present measurements of the ratio of the proton elastic electromagnetic form factors, μ_pG_(Ep)/G_(Mp). The Jefferson Lab Hall A Focal Plane Polarimeter was used to determine the longitudinal and transverse components of the recoil proton polarization in ep elastic scattering; the ratio of these polarization components is proportional to the ratio of the two form factors. These data reproduce the observation of Jones et al. [Phys. Rev. Lett. 84, 1398 (2000)], that the form factor ratio decreases significantly from unity above Q^2=1 GeV^2.

Additional Information

© 2001 The American Physical Society. Received 29 May 2001; published 21 August 2001. The collaboration thanks the Hall A technical staff and the Jefferson Lab Accelerator Division for their outstanding support during this experiment. This work was supported by the U.S. Department of Energy, the U.S. National Science Foundation, the Natural Sciences and Engineering Research Council of Canada, the French Commissariat à l'Energie Atomique and Center National de la Recherche Scientifique, the Italian National Institute for Nuclear Physics, and the Swedish Natural Science Research Council. The Southeastern Universities Research Association (SURA) operates the Thomas Jefferson National Accelerator Facility for the U.S. Department of Energy under Contract No. DE-AC05- 84ER40150.

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