Dear all, this is my first thread in the forum. I am trying to solve the following problem. it was given during a written exam at my university (many years ago) and I really would appreciate if someone will help me to solve it 1. The problem statement, all variables and given/known data Show that if the hamiltonian of the strong interaction is invariant under SU(6) Spin- Flavor (instead of under SU(3)F ⊗SU(2)S) then it is possible explain the mixing of pseudo scalar and vectorial mesons in the octet and singlet (η − η’ y ω − φ). 2. Relevant equations 3. The attempt at a solution I have no idea how to approach this problem.