Electric and magnetic form factors of the proton

Bernauer, J. C. and Distler, M. O. and Friedrich, J. and Walcher, Th. and Achenbach, P. and Ayerbe Gayoso, C. and Bohm, R. and Bosnar, Damir and Debenjak, L. and Doria, L. and Esser, A. and Fonvieille, H. and Gomez Rodriguez de la Paz, M. and Friedrich, J. M. and Makek, Mihael and Merkel, H. and Middleton, D. G. and Muller, U. and Nungesser, L. and Pochodzalla, J. and Potokar, M. and Sanchez Majos, S. and Schlimme, B. S. and Širca, S. and Weinriefer, M. (A1 Collaboration) (2014) Electric and magnetic form factors of the proton. Physical Review C, 90 (1). pp. 15206-34. ISSN 0556-2813

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Abstract

This paper describes a precise measurement of electron scattering off the proton at momentum transfers of 0.003 ≤ Q^2 ≤ GeV^2. The average point-to-point error of the cross sections in this experiment is ∼0.37%. These data are used for a coherent new analysis together with all world data of unpolarized and polarized electron scattering from the very smallest to the highest momentum transfers so far measured. The extracted electric and magnetic form factors provide new insight into their exact shape, deviating from the classical dipole form, and of structure on top of this gross shape. The data reaching very low Q^2 values are used for a new determination of the electric and magnetic radii. An empirical determination of the two-photon-exchange correction is presented. The implications of this correction on the radii and the question of a directly visible signal of the pion cloud are addressed.

Item Type: Article
Date: July 2014
Subjects: NATURAL SCIENCES > Physics
Additional Information: Copyright (2014) by the American Physical Society.
Divisions: Faculty of Science > Department of Physics
Publisher: American Physical Society
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 27 Aug 2014 16:19
Last Modified: 25 Nov 2014 11:28
URI: http://digre.pmf.unizg.hr/id/eprint/2557

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