Nucleon and Delta in a covariant quark-diquark model

Details Nucleon and Delta in a covariant quark-diquark model Nucleon and Delta in a covariant quark-diquark model

1996-12-09

arxiv.org/abs/nucl-th/9612018v1

Physics

Nuclear Physics

Nuclear Theory

9 pages, LaTeX, 13 figures, uses sprocl.sty (included) from World Scientific; talk given at 'Diquarks 3', Torino, Oct. 28-30,

Scientific paper

We develop a formally covariant quark-diquark model of the nucleon. The nucleon is treated as a bound state of a constituent quark and a diquark interacting via a quark exchange. We include both scalar and axial-vector diquarks. The underlying Bethe-Salpeter equation is transformed into a pair of coupled Salpeter equations. The space- and timelike electromagnetic form factors of the nucleon are calculated in the Mandelstam formalism for squared momentum transfers up to 3 (GeV/c)^2 above threshold. The model is applied also to the Delta(3/2).

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