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Measurement of GEp/GMp in ep -> ep to Q2 = 5.6 GeV2

O. Gayou, E. J. Brash, M. K. Jones, C. F. Perdrisat, V. Punjabi, L. Pentchev, A. Kozlov

Published 2001-11-15, updated 2001-11-16Version 2

The ratio of the electric and magnetic form factors of the proton, GEp/GMp, 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 $\vec ep \to e\vec p$ reaction. The new data presented in this article span the range 3.5 < Q2 < 5.6 GeV2 and are well described by a linear Q2 fit. Also, the ratio QF2p/F1p reaches a constant value above Q2=2 GeV2.

Comments: 6 pages, 4 figures Added two names to the main author list
Journal: Phys.Rev.Lett.88:092301,2002
Categories: nucl-ex
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