On flavor mixing by an effective Light-Cone QCD-Hamiltonian

The ↑↓-model has produced the physical masses of all flavor-asymmetric mesons like the π or the ρ. Can the same model also account for the flavor-symmetric mesons like the π or the ρ? — By adjusting one parameter in a 5× 5-matrix, the π-η degeneracy is lifted and the η − η splitting falls into the right ball park. The isospin triplets for pions and rhos are caused the mass-degeneracy of the up and down quark.