Arne Höll

Argonne, Physics Division

Regarding Nucleon Electromagnetic Form Factors

Modern, high-luminosity experimental facilities that employ large momentum transfer reactions are providing remarkable and intriguing new information on nucleon structure. At values of momentum transfer Q2 > M2, where M is the nucleon's mass, a veracious understanding of these and other contemporary data require a Poincaré covariant description of the nucleon. This may be achieved through a covariant Faddeev equation, which describes the nucleon and Delta in terms of confined quark and nonpointlike confined diquark correlations. The Faddeev amplitudes provide the necessary input to a Ward-Takahashi identity preserving nucleon electromagnetic current, which yields the nucleons' form factors. A reliable description of the these form factors requires a careful consideration of "pion cloud" effects.

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