Negative parity baryons in the $1\mathrm{/}{N}_c$ expansion: the quark excitation versus the meson-nucleon resonance picture

In order to better understand the fundamental issue regarding the compatibility between the quark-shell picture and that of resonances in meson-nucleon scattering in large $N_c$ QCD we extend the work of Cohen and Lebed on mixed symmetric $\mathrm{\ell }$ = 1 baryons to analyze excited states with $\mathrm{\ell }$ = 3. We give an explicit proof on the degeneracy of mass eigenvalues of a simple Hamiltonian including operators up to order $\mathcal{O}(N_c^0)$ \emph{i. e.} neglecting $1\mathrm{/}{N}_c$ corrections in the quark-shell picture in the large $N_c$ limit. We obtain three degenerate multiplets formed of $\mathrm{\ell }=3$ states, as in the case of $\mathrm{\ell }$ = 1 baryons. The compatibility between this picture and that of resonances in meson-nucleon scattering is discussed in the light of the present results.