Charge form factors and nucleon shape

Details Charge form factors and nucleon shape Charge form factors and nucleon shape

2007-12-27

arxiv.org/abs/0712.4270v1

AIP Conf.Proc.904:110-125,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

14 pages, 5 figures, Proceedings of Shapes of Hadrons Workshop, Athens, Greece, 27-29 April 2006

Scientific paper

10.1063/1.2734297

To obtain further information on the geometric shape of the nucleon, the proton charge form factor is decomposed into two terms, which are connected respectively with a spherically symmetric and an intrinsic quadrupole part of the proton's charge density. Quark model relations are employed to derive expressions for both terms. In particular, the proton's intrinsic quadrupole form factor is obtained from a relation between the N -> Delta and neutron charge form factors. The proposed decomposition shows that the neutron charge form factor is an observable manifestation of an intrinsic quadrupole form factor of the nucleon. Furthermore, it affords an interpretation of recent electron-nucleon scattering data in terms of a nonspherical distribution of quark-antiquark pairs in the nucleon.

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