Helicity amplitudes of nonstrange baryons in the third and fourth resonance region
2008
Baryon resonances with masses around 1600 MeV and higher come into play already at threshold in meson photo- and electroproduction reactions from the proton such as p(γ (*), ππ)N, p(γ (*), K)Y, p(γ (*), ω)p and p(γ (*), η)p. We present results for the Q 2 dependence of the helicity amplitudes of these nonstrange baryons resonances, computed in the framework of the Bethe-Salpeter model developed by the Bonn group. The model describes bound states of three relativistic constituent quarks, interacting through an instantaneous linear confining potential and a residual instanton-induced interaction potential. The seven model parameters were fitted to the best known baryon masses, but no extra parameters are introduced in computing the helicity amplitudes.
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