Abstract
We present a simple, formally covariant constituent diquark-quark model for the nucleon. The nucleon is assumed to be composed of a scalar diquark and a quark which interact via a quark exchange. Starting from the Bethe-Salpeter equation, the instantaneous approximation leads to a diquark-quark Salpeter equation. In the Mandelstam formalism, the electromagnetic form factors of the nucleon are calculated for momentum transfers up toq 2=−3 (GeV/c)2. A remarkable description of the experimental data is obtained. Especially, the model gives the right value for the proton charge radius, a negative mean square charge radius of the neutron and a qualitative description of the magnetic form factors.
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Communicated by W. Weise
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