QUARK MODEL ESTIMATES OF THE STRUCTURE OF THE MESON-N-N*(1/2-) TRANSITION VERTICES

Abstract

We address an actual problem of baryon-resonance dominated meson-exchange processes in the low GeV regime, i.e. the phase and the structure of meson-NN* transition vertices. Our starting point is a quark-diquark model for the baryons (obeying approximate covariance; the mesons are kept as elementary objects), together with the relative phases for the NN vertices, as determined from low energy NN scattering. From the explicit representation of the N and N* baryons, we exemplify the derivation of phases, coupling constants and form factors of the NN* (J = 1/2-) transition vertices for pseudo-scalar, scalar and vector mesons.