Roper et al. Classified

We apply our transition mixing model to the even-parity baryon resonances that abound in the ∼ 2 GeV mass region. The assumption is that n = 2 harmonic oscillator levels having the same strong interaction quantum numbers start off degenerate. Mixing and mass splitting are then effected by allowing the degenerate levels to make transitions into and out of low-lying two-body intermediate states. Coupling are computed in the SU(6)_W×O(2)_LZ limit with the relative strength of the different SU(6)×O(3) multiplets given by the symmetry of the harmonic oscillator quark model. The principal achievements of the model are a natural explanation of the Roper resonance's low mass, and why at first glance the majority of these states appear to be pure 56, L even. The model indicates how many of the missing formation states should be looked for and predicts properties (mixing angles, couplings and mass splitting ratios) of the Ξ^* and Ω^* resonances.