Quark Model Estimates of the Structure of the Meson-N-N*(1535,1/2-) Transition Vertices
M. Dillig, S. S. Rocha, G. F. Marranghello, E. F. Luetz, C. A. Z. Vasconcellos
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 the coupling constants and form factors of the NN*(1535,1/2-)transition vertices for pseudo-scalar, scalar and vector mesons.
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