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Measurement of the neutron electric to magnetic form factor ratio at Q2 = 1.58 GeV2 using the reaction 3He(e,e'n)pp

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arxiv 1307.7361 v2 pith:W4AQMBFN submitted 2013-07-28 nucl-ex

B. S. Schlimme , P. Achenbach , C. A. Ayerbe Gayoso , J. C. Bernauer , R. Böhm , D. Bosnar , Th. Challand , M. O. Distler
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L. Doria F. Fellenberger H. Fonvieille M. Gómez Rodríguez P. Grabmayr T. Hehl W. Heil D. Kiselev J. Krimmer M. Makek H. Merkel D. G. Middleton U. Müller L. Nungesser B. A. Ott J. Pochodzalla M. Potokar S. Sánchez Majos M. M. Sargsian I. Sick S. Širca M. Weinriefer M. Wendel C. J. Yoon
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A measurement of beam helicity asymmetries in the reaction 3He(e,e'n)pp has been performed at the Mainz Microtron in quasielastic kinematics in order to determine the electric to magnetic form factor ratio of the neutron, GEn/GMn, at a four momentum transfer Q2 = 1.58 GeV2. Longitudinally polarized electrons were scattered on a highly polarized 3He gas target. The scattered electrons were detected with a high-resolution magnetic spectrometer, and the ejected neutrons with a dedicated neutron detector composed of scintillator bars. To reduce systematic errors data were taken for four different target polarization orientations allowing the determination of GEn/GMn from a double ratio. We find mu_n GEn/GMn = 0.250 +/- 0.058(stat.) +/- 0.017 (sys.).

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    A six-parameter extended vector meson dominance model with four rho/omega radial excitations per channel is fitted to world data on nucleon form factors, giving a moderate but physically constrained description.

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